CN118778309A

CN118778309A - Reflective display device and driving method

Info

Publication number: CN118778309A
Application number: CN202411048327.6A
Authority: CN
Inventors: 许雅琴; 黄丽玉; 顾小祥
Original assignee: InfoVision Optoelectronics Kunshan Co Ltd
Current assignee: InfoVision Optoelectronics Kunshan Co Ltd
Priority date: 2024-08-01
Filing date: 2024-08-01
Publication date: 2024-10-15

Abstract

The invention discloses a reflective display device and a driving method, wherein the reflective display device comprises a liquid crystal box and an electronic ink screen which are mutually overlapped; the liquid crystal box comprises a first opposite substrate, a first array substrate and a dye liquid crystal layer, wherein the first array substrate is provided with a Bragg reflection layer corresponding to at least one of a first sub-pixel, a second sub-pixel and a third sub-pixel; the electronic ink screen comprises a second opposite substrate, a second array substrate and ink capsules, wherein all the ink capsules are internally provided with first color ink particles and second color ink particles with opposite polarities. Under the mutual cooperation of dye liquid crystal, bragg reflection layer and electronic ink screen, the reflection type display device not only can realize single-color picture display, but also can realize full-color picture display and double-sided display, and only needs to adopt a double-box structure, so that the thickness, the driving power consumption and the manufacturing cost are reduced relative to a three-box structure, and the product competitiveness is improved.

Description

Reflective display device and driving method

Technical Field

The present invention relates to the field of display technologies, and in particular, to a reflective display device and a driving method thereof.

Background

The display panel has the advantages of light weight, durability, energy conservation, environmental protection, low power consumption and the like, but needs to be matched with a backlight source, so that the module is thick and the cost is high. The electronic paper display (reflective display) is a display meeting the needs of the public, and the electronic paper display can display images by using an external light source, unlike a liquid crystal display which needs a backlight, so that information on the electronic paper can still be clearly seen in an environment with strong outdoor sunlight without a problem of visual angle, and the electronic paper display has been widely applied to electronic readers (such as electronic books and electronic newspapers) or other electronic components (such as price tags) because of the advantages of power saving, high reflectivity, contrast ratio and the like.

Existing electronic paper displays typically employ E-Ink microcapsule technology (microcapsule electronic Ink technology), siPix microcup technology (microcup electrophoretic display technology), bridgestone electronic liquid powder technology, cholesteric liquid crystal display (Cholesteric Liquid CRYSTAL DISPLAY, CLCD) technology, microelectromechanical system (MEMS) technology, or electrowetting (electrowetting) technology. However, the existing electronic paper display technology is not mature relatively to the liquid crystal display technology, the mass production efficiency is low, the manufacturing cost is relatively high, and the existing electronic paper display can only realize black and white or single-color display.

In the prior art, a reflective display device adopting cholesteric liquid crystal only can reflect one color and transmit light rays of other colors due to the requirement of the pitch of the cholesteric liquid crystal. Therefore, the reflective display device of the single-layer cholesteric liquid crystal is mostly displayed in the forms of yellow-background black characters or black-background yellow characters, black-background red characters or red-background black characters and the like, and can not realize the display of black-background white characters or white-background black characters like books, so that the reflective display device is greatly limited in product application; and the color of the cholesteric liquid crystal reflected light is poor, so that the display effect is affected. If white display or color display is required, the reflective display device needs to use three layers of cholesteric liquid crystal boxes to reflect red/green/blue light respectively, so that white display and color display are realized, but the three layers of cholesteric liquid crystal boxes are large in box thickness, high in power consumption, complex in process and high in cost.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a reflective display device and a driving method thereof, so as to solve the problem that an electronic paper display in the prior art can only realize single color or thicker box thickness.

The aim of the invention is achieved by the following technical scheme:

The invention provides a reflective display device, which comprises a liquid crystal box and an electronic ink screen, wherein the liquid crystal box and the electronic ink screen are mutually overlapped, the liquid crystal box is close to a first surface of the reflective display device, and the electronic ink screen is close to a second surface of the reflective display device;

The liquid crystal box comprises a first opposite substrate, a first array substrate arranged opposite to the first opposite substrate and a dye liquid crystal layer arranged between the first opposite substrate and the first array substrate, the liquid crystal box is provided with a plurality of first pixel units distributed in an array, the first pixel units are provided with first sub-pixels, second sub-pixels and third sub-pixels, the first array substrate is provided with a first pixel electrode and a Bragg reflection layer, at least one of the first sub-pixels, the second sub-pixels and the third sub-pixels corresponds to the Bragg reflection layer, and the first opposite substrate is provided with a first common electrode matched with the first pixel electrode;

The electronic ink screen comprises a second opposite substrate, a second array substrate and an ink capsule, wherein the second array substrate is arranged opposite to the second opposite substrate, the ink capsule is positioned between the second opposite substrate and the second array substrate, all the ink capsules are internally provided with first color ink particles and second color ink particles with opposite polarities, the second array substrate is provided with a second pixel electrode, and the second opposite substrate is provided with a second common electrode matched with the second pixel electrode.

Further, the Bragg reflection layer includes a long-pass filter corresponding to the first sub-pixel and a short-pass filter corresponding to the second sub-pixel and the third sub-pixel, the long-pass filter being capable of transmitting red-green light and reflecting blue light, and the short-pass filter being capable of transmitting blue light and reflecting red-green light.

Further, the first color ink particles are one of black ink particles, white ink particles, red ink particles, green ink particles and blue ink particles, the second color ink particles are one of black ink particles, white ink particles, red ink particles, green ink particles and blue ink particles, and the first color ink particles and the second color ink particles are ink particles with different colors.

Further, the first opposite substrate is provided with a blue light gap layer in a region corresponding to the first sub-pixel, and/or is provided with a green light gap layer in a region corresponding to the second sub-pixel, and/or is provided with a red light gap layer in a region corresponding to the third sub-pixel.

Further, the electronic ink screen is provided with a plurality of second pixel units distributed in an array, and the first pixel units are in one-to-one correspondence with the second pixel units.

Further, the first opposite substrate and the first array substrate are in a full transparent state in a region corresponding to the first sub-pixel, one of the first color ink particles and the second color ink particles is a black ink particle, the other one is a blue ink particle, the bragg reflection layer comprises a short-pass filter, the short-pass filter corresponds to the second sub-pixel and the third sub-pixel, and the short-pass filter can transmit blue light and reflect red and green light;

Or, the first opposite substrate and the first array substrate are in a full transparent state in a region corresponding to the second sub-pixel, one of the first color ink particles and the second color ink particles is a black ink particle, the other one is a green ink particle, the bragg reflection layer comprises a long-pass filter and a short-pass filter, the long-pass filter corresponds to the first sub-pixel, the short-pass filter corresponds to the third sub-pixel, the long-pass filter can transmit red green light and reflect blue light, and the short-pass filter can transmit blue light and reflect red green light;

Or, the first opposite substrate and the first array substrate are in a full transparent state in a region corresponding to the third sub-pixel, one of the first color ink particles and the second color ink particles is a black ink particle, the other one is a red ink particle, the bragg reflection layer comprises a long-pass filter and a short-pass filter, the long-pass filter corresponds to the first sub-pixel, the short-pass filter corresponds to the second sub-pixel, the long-pass filter can transmit red green light and reflect blue light, and the short-pass filter can transmit blue light and reflect red green light.

Further, the first counter substrate and the first array substrate are in a full transparent state in the areas corresponding to the first sub-pixel and the second sub-pixel, one of the first color ink particles and the second color ink particles is a green ink particle, the other is a blue ink particle, the bragg reflection layer comprises a short-pass filter, the short-pass filter corresponds to the third sub-pixel, and the short-pass filter can transmit blue light and reflect red and green light;

Or, the first counter substrate and the first array substrate are in a full transparent state in the areas corresponding to the first sub-pixel and the third sub-pixel, one of the first color ink particles and the second color ink particles is a red ink particle, the other is a blue ink particle, the bragg reflection layer comprises a short-pass filter, the short-pass filter corresponds to the second sub-pixel, and the short-pass filter can transmit blue light and reflect red and green light;

Or, the first opposite substrate and the first array substrate are in a full transparent state in the areas corresponding to the second sub-pixel and the third sub-pixel, one of the first color ink particles and the second color ink particles is a red ink particle, the other is a green ink particle, the Bragg reflection layer comprises a long-pass filter, the long-pass filter corresponds to the first sub-pixel, and the long-pass filter can transmit red green light and reflect blue light.

The present application also provides a driving method of a reflective display device for driving the reflective display device as described above, the driving method comprising:

When the two-color picture is displayed on the second face independently, the liquid crystal box is controlled to be closed and the electronic ink screen is controlled to be opened, and the electronic ink screen displays the two-color picture towards the second face;

when the first surface displays a full-color picture and the second surface displays a double-color picture, the liquid crystal box is controlled to be opened with the electronic ink screen, the liquid crystal box displays the full-color picture towards the first surface, and the electronic ink screen displays the double-color picture towards the second surface.

Further, the bragg reflection layer includes a long-pass filter corresponding to the first subpixel and a short-pass filter corresponding to the second subpixel and the third subpixel, the long-pass filter being capable of transmitting red green light and reflecting blue light, the short-pass filter being capable of transmitting blue light and reflecting red green light, one of the first color ink particles and the second color ink particles being black ink particles, the driving method including;

When the full-color picture is displayed on the first surface alone, the liquid crystal box is controlled to be opened and closed, black ink particles in all ink capsules in the electronic ink screen face the liquid crystal box, and the liquid crystal box displays the full-color picture towards the first surface.

Further, the bragg reflection layer includes a long-pass filter corresponding to the first subpixel and a short-pass filter corresponding to the second subpixel and the third subpixel, the long-pass filter being capable of transmitting red and green light and reflecting blue light, the short-pass filter being capable of transmitting blue light and reflecting red and green light, the first opposite substrate being provided with a blue light gap layer in a region corresponding to the first subpixel, a green light gap layer in a region of the second subpixel, and a red light gap layer in a region of the third subpixel, the driving method comprising;

And when the full-color picture is displayed on the first surface alone, controlling the liquid crystal box to be opened and closed, and enabling the liquid crystal box to display the full-color picture towards the first surface.

The invention has the beneficial effects that: under the mutual cooperation of dye liquid crystal, bragg reflection layer and electronic ink screen, the reflection type display device not only can realize single-color picture display, but also can realize full-color picture display and double-sided display, and only needs to adopt a double-box structure, so that thickness driving power consumption and manufacturing cost are reduced relative to a three-box structure, and product competitiveness is improved.

Drawings

FIG. 1 is a schematic diagram of a reflective display device in an initial state according to an embodiment of the invention;

FIG. 2 is a schematic plan view of a first array substrate according to an embodiment of the present invention;

FIG. 3 is a schematic plan view of a second array substrate according to an embodiment of the invention;

FIG. 4 is a graph showing transmittance of a long-pass filter and a short-pass filter for different light rays according to an embodiment of the present invention;

FIG. 5 is a graph showing the reflectivity of a short-pass filter for light rays with different incident angles according to an embodiment of the present invention;

FIG. 6 is a graph showing the reflectivity of a long pass filter for light at different angles of incidence in accordance with an embodiment of the present invention;

FIG. 7 is a schematic diagram of a reflective display device in a black state according to an embodiment of the invention;

fig. 8 is a schematic structural diagram of a reflective display device according to an embodiment of the invention when displaying a black-and-white screen on a second surface;

FIG. 9 is a schematic diagram of a reflective display device according to an embodiment of the invention when the first surface is in a white state;

FIG. 10 is a schematic diagram illustrating an analysis of an optical path of a reflective display device in a first plane for displaying a white state according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a reflective display device according to an embodiment of the invention when a full-color image is displayed on a first surface;

FIG. 12 is a schematic view illustrating an optical path analysis of the reflective display device according to the first embodiment of the invention when a full-color image is displayed on the first surface;

Fig. 13 is a schematic structural diagram of a reflective display device according to a second embodiment of the present invention when a full-color screen is displayed on a first surface and a dual-color screen is displayed on a second surface;

fig. 14 is a schematic view illustrating an optical path analysis when the reflective display device in the second embodiment of the invention displays a full-color image on the first surface and a dual-color image on the second surface;

fig. 15 is a schematic structural diagram of a reflective display device according to a third embodiment of the present invention when a full-color screen is displayed on a first surface and a dual-color screen is displayed on a second surface;

Fig. 16 is a schematic view illustrating an optical path analysis when the reflective display device in the third embodiment of the present invention displays a full-color image on the first surface and a dual-color image on the second surface;

fig. 17 is a schematic diagram of a reflective display device according to a fourth embodiment of the present invention when a full-color screen is displayed on a first surface and a dual-color screen is displayed on a second surface;

Fig. 18 is a schematic view illustrating an optical path analysis when the reflective display device in the fourth embodiment of the present invention displays a full-color screen on the first surface and a dual-color screen on the second surface;

fig. 19 is a schematic diagram of a reflective display device according to a fifth embodiment of the present invention when a full-color screen is displayed on a first surface and a dual-color screen is displayed on a second surface;

Fig. 20 is a schematic view illustrating an optical path analysis when a reflective display device displays a full-color image on a first surface and a dual-color image on a second surface.

Detailed Description

In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description refers to the specific implementation, structure, characteristics and effects of the reflective display device and driving method according to the invention with reference to the accompanying drawings and preferred embodiments, wherein:

Example one

Fig. 1 is a schematic structural diagram of a reflective display device in an initial state according to an embodiment of the invention. FIG. 2 is a schematic plan view of a first array substrate according to an embodiment of the invention. Fig. 3 is a schematic plan view of a second array substrate according to an embodiment of the invention.

As shown in fig. 1 to 3, a reflective display device according to an embodiment of the present invention includes a liquid crystal cell 10 and an electronic ink screen 20 stacked on each other, wherein the liquid crystal cell 10 is close to a first surface of the reflective display device, and the electronic ink screen 20 is close to a second surface of the reflective display device, for example, the first surface is an upper side surface of the reflective display device, and the second surface is a lower side surface of the reflective display device.

The liquid crystal cell 10 includes a first counter substrate 11, a first array substrate 12 disposed opposite the first counter substrate 11, and a dye liquid crystal layer 13 between the first counter substrate 11 and the first array substrate 12, the first counter substrate 11 being adjacent to a first face of the liquid crystal cell 10, and the first array substrate 12 being adjacent to a second face of the liquid crystal cell 10. The liquid crystal cell 10 has a plurality of first pixel units P1 distributed in an array, wherein the plurality of first pixel units P1 have a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3, and the first array substrate 12 is provided with a first pixel electrode 121 and a bragg reflection layer, and at least one of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 corresponds to the bragg reflection layer. The first counter substrate 11 is provided with a first common electrode 111 which is matched with the first pixel electrode 121, the first common electrode 111 is a planar electrode which entirely covers the first counter substrate 11, and the first pixel electrode 121 is a block electrode which corresponds to the first pixel unit P1 one by one.

The dye liquid crystal layer 13 includes liquid crystal molecules 131 and dye molecules 132 mixed with each other, that is, the dye liquid crystal layer 13 is doped with the dye molecules 132. In the dye liquid crystal layer 13, the liquid crystal molecules 131 are positive liquid crystal molecules (liquid crystal molecules having positive dielectric anisotropy), as shown in fig. 1, in an initial state, the liquid crystal molecules 131 and the dye molecules 132 are aligned parallel to the first counter substrate 11 and the first array substrate 12, and an alignment direction of the dye liquid crystal layer 13 near the first counter substrate 11 and an alignment direction of the dye liquid crystal layer 13 near the first array substrate 12 are perpendicular to each other, that is, the liquid crystal molecules 131 and the dye molecules 132 in the dye liquid crystal layer 13 are twisted by 90 ° from bottom to top to form a TN display mode. The light absorption capacity of the long axis of the dye molecule 132 is greater than that of the short axis, and the dye molecule 132 has the characteristic that the long axis has strong light absorption capacity and the short axis has weak light absorption capacity, so that the control of gray scale brightness can be realized without arranging additional polarizers on two sides of the liquid crystal box. Since the liquid crystal molecules 131 and 132 in the dye liquid crystal layer 13 are twisted by 90 ° from bottom to top, the liquid crystal cell in the present embodiment is in an off state, i.e., a dark state, at the initial state.

As shown in fig. 2, the first array substrate 12 is provided with a plurality of first scan lines 101, a plurality of first data lines 102, and a plurality of first thin film transistors 103, and the first array substrate 12 is provided with a first pixel electrode 121 and a first thin film transistor 103 in a region corresponding to each first pixel unit P1. The first pixel electrode 121 is electrically connected to the first scan line 101 and the first data line 102 adjacent to the first thin film transistor 103 through the first thin film transistor 103. The first thin film transistor 103 includes a first gate electrode, a first active layer, a first drain electrode, and a first source electrode, where the first gate electrode and the first scan line 101 are located on the same layer and electrically connected, the first gate electrode and the first active layer are isolated by an insulating layer, the first source electrode is electrically connected to the first data line 102, and the first drain electrode and the first pixel electrode 121 are electrically connected by a contact hole.

In this embodiment, the bragg reflection layer includes a long-pass filter 141 and a short-pass filter 142, the long-pass filter 141 corresponds to the first sub-pixel SP1, the short-pass filter 142 corresponds to the second sub-pixel SP2 and the third sub-pixel SP3, the long-pass filter 141 is capable of transmitting red and green light and reflecting blue light, and the short-pass filter 142 is capable of transmitting blue light and reflecting red and green light. That is, the first subpixel SP1 may reflect blue light alone, and the second subpixel SP2 and the third subpixel SP3 may reflect red green light (yellow light). Optionally, the ratio of the areas of the first, second and third sub-pixels SP1, SP2 and SP3 is 1:0.5:0.5, so that the first, second and third sub-pixels SP1, SP2 and SP3 can mix white light.

Among them, the Long-pass filter 141 (Short-PASS FILTER, SPF) and the Short-pass filter 142 (Long-PASS FILTER, LPF) belong to bragg reflectors (Distributed Bragg reflector, DBR), the Short-pass filter 142 is capable of transmitting blue light having a wavelength of 490nm or less and reflecting red-green light having a wavelength of 500 to 680nm, and the Long-pass filter 141 is capable of transmitting red-green light having a wavelength of 500 to 680nm and reflecting blue light having a wavelength of 490nm or less. The distributed bragg reflector (distributed Bragg reflector, DBR) is a reflector used in a waveguide, and the long-pass filter 141 and the short-pass filter 142 are DBRs achieving two different bandpass by adjusting the thickness of the film layer and the logarithm using SiO ₂ (silicon dioxide) and TiO ₂ (titanium dioxide) as alternating materials. Light is reflected at the interface when passing through different media, the reflectivity is related to the refractive index between the media, so if we stack films with different refractive indexes together periodically, when light passes through the films with different refractive indexes, the light reflected by each layer interferes constructively due to the change of the phase angle, and then combines with each other to obtain strong reflected light. If the number of layers becomes very large and the difference in the refractive indices n1, n2, n3 … of the films becomes very small, the light proceeds as if it were in the same medium, and the reflectance becomes very small. The interference effect is quite pronounced due to the multiple interference of light, and thus the choice of wavelengths becomes very sharp, and such periodic structures are known as distributed bragg reflectors when a grating-like structure is used.

Fig. 4 is a graph showing transmittance of the long-pass filter and the short-pass filter for different light rays according to the first embodiment of the present invention, as shown in fig. 4, a curve R, G, B in the graph shows the wavelengths of red, green and blue light, and curves L and S show the transmittance of the long-pass filter 141 and the short-pass filter 142 for different wavelengths of light rays, respectively. As can be seen from fig. 4, the long-pass filter 141 has a better transmission effect on blue light with a wavelength below 490nm, and the transmittance can reach more than 95%; the short-pass filter 142 has a good transmission effect on red and green light with the wavelength of 500-680 nm, and the transmittance can reach more than 95%.

Fig. 5 is a graph of the reflectivity of the middle-short pass filter for light with different incident angles, fig. 6 is a graph of the reflectivity of the middle-long pass filter for light with different incident angles, as shown in fig. 5 and 6, wherein curves S1, S2, S3 and S4 respectively show the reflectivity of the short pass filter 142 for white light with the incident angles of 0 °, 20 °, 40 ° and 60 °, and curves L1, L2, L3 and L4 respectively show the reflectivity of the long pass filter 141 for white light with the incident angles of 0 °, 20 °, 40 ° and 60 °, and as can be seen from fig. 5 and 6, the short pass filter 142 has the reflectivity of up to 98% for red and green light with the incident angle of less than 40 ° and 490-700 nm, which is beneficial for the reflection utilization of red and green light, and meanwhile, the long pass filter 141 also has the reflectivity of 94% for blue light with the incident angle of 400-500 nm, which reduces the emission rate of blue light, and improves the reflection utilization of blue light.

Further, the first opposite substrate 11 is further provided with a black matrix 112, and the black matrix 112 is used for separating the plurality of first pixel units P1 from each other, so as to avoid the problem of light leakage or color mixing among the plurality of first pixel units P1. In the present embodiment, the first counter substrate 11 is in a fully transparent state in the areas of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 (i.e., the light can completely pass through the first counter substrate 11, and the light is not substantially reflected or absorbed), and the areas of the first counter substrate 11 in the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 are covered with a flat layer (OC material).

The electronic ink screen 20 includes a second opposite substrate 21, a second array substrate 22 disposed opposite the second opposite substrate 21, and an ink capsule 23 disposed between the second opposite substrate 21 and the second array substrate 22, the second opposite substrate 21 being adjacent to a first side of the electronic ink screen 20, and the second array substrate 22 being adjacent to a second side of the electronic ink screen 20. All of the ink capsules 23 are provided therein with first color ink particles 231 and second color ink particles 232 of opposite polarities and different colors. The electronic ink screen 20 has a plurality of second pixel units P2 distributed in an array, and each second pixel unit P2 is provided with an ink capsule 23. By providing the ink capsules 23 with electric fields of different directions, the first color ink particles 231 and the second color ink particles 232 can be moved toward the corresponding directions. In this embodiment, the first color ink particles 231 are negatively charged and the second color ink particles 232 are positively charged, so that the second color ink particles 232 move toward the direction of the electric field and the first color ink particles 231 move toward the opposite direction of the electric field. If an electric field is supplied in an upward direction, the second color ink particles 232 move in an upward direction, and the first color ink particles 231 move in a downward direction; if an electric field in a downward direction is supplied, the second color ink particles 232 move in a downward direction, and the first color ink particles 231 move in an upward direction. Of course, in other embodiments, the first color ink particles 231 may be positively charged and the second color ink particles 232 may be negatively charged, so that the first color ink particles 231 move toward the electric field and the second color ink particles 232 move toward the opposite direction of the electric field. If an electric field is supplied in an upward direction, the second color ink particles 232 move in a downward direction, and the first color ink particles 231 move in an upward direction; if an electric field in a downward direction is supplied, the second color ink particles 232 move in an upward direction, and the first color ink particles 231 move in a downward direction.

The second array substrate 22 is provided with second pixel electrodes 221, the second pixel electrodes 221 are in one-to-one correspondence with the second pixel units P2, and the second counter substrate 21 is provided with a second common electrode 211 matched with the second pixel electrodes 221. The second pixel electrode 221 is a block electrode corresponding to the second pixel unit P2, and the second common electrode 211 is a planar electrode covering the entire surface of the second counter substrate 21. The direction of the electric field between the second pixel electrode 221 and the second common electrode 211 is controlled by controlling the polarity of the voltage on the second pixel electrode 221. For example, if a negative voltage (e.g., -10 to-20V) is applied to the second common electrode 211 and a positive voltage (e.g., +10 to +20V) is applied to the second pixel electrode 221, the direction of the electric field between the second pixel electrode 221 and the second common electrode 211 is directed upward, the first color ink particles 231 are moved toward the second pixel electrode 221, and the second color ink particles 232 are moved toward the second common electrode 211; if a positive voltage (for example, +10 to +20v) is applied to the second common electrode 211 and a negative voltage (for example, -10 to-20V) is applied to the second pixel electrode 221, the direction of the electric field between the second pixel electrode 221 and the second common electrode 211 is directed downward, the first color ink particles 231 are moved toward the second common electrode 211, and the second color ink particles 232 are moved toward the second pixel electrode 221.

In this embodiment, the first pixel units P1 and the second pixel units P2 are in one-to-one correspondence, so as to facilitate control of the display screen of the double-sided display (i.e. one side is a double-color screen display, and the other side is a full-color screen). Of course, in other embodiments, one first pixel unit P1 may correspond to a plurality of second pixel units P2, or a plurality of first pixel units P1 may correspond to one second pixel unit P.

As shown in fig. 3, the second array substrate 22 is provided with a plurality of second scan lines 201, a plurality of second data lines 202, and a plurality of second thin film transistors 203, and the second array substrate 22 is provided with a second pixel electrode 221 and a second thin film transistor 203 in a region corresponding to each second pixel unit P2. The second pixel electrode 221 is electrically connected to the second scan line 201 and the second data line 202 adjacent to the second thin film transistor 203 through the second thin film transistor 203. The second thin film transistor 203 includes a second gate electrode, a second active layer, a second drain electrode, and a second source electrode, where the second gate electrode is located on the same layer as the second scan line 201 and is electrically connected to the second scan line, the second gate electrode is isolated from the second active layer by an insulating layer, the second source electrode is electrically connected to the second data line 202, and the second drain electrode is electrically connected to the second pixel electrode 221 by a contact hole.

The first counter substrate 11, the first array substrate 12, the second counter substrate 21, and the second array substrate 22 may be made of transparent substrates such as glass, acrylic, and polycarbonate. The materials of the first common electrode 111, the first pixel electrode 121, the second common electrode 221, and the second pixel electrode 221 may be transparent electrodes such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO). Of course, in other embodiments, the second array substrate 22 may be made of a non-transparent substrate or black ink may be coated on the second array substrate 22, so that the reflective display device can only display full-color images on the first surface, and not display images on the second surface, and is pure black.

Further, the first color ink particles 231 are one of black ink particles, white ink particles, red ink particles, green ink particles, and blue ink particles, the second color ink particles 232 are one of black ink particles, white ink particles, red ink particles, green ink particles, and blue ink particles, and the first color ink particles 231 and the second color ink particles 232 are ink particles of different colors. In this embodiment, the first color ink particles 231 are black ink particles, the second color ink particles 232 are white ink particles, wherein the white ink particles can be used to realize white reflection by the single first pixel unit P1, and the black ink particles are purer in color during full-color image display. Of course, in other embodiments, the first color ink particles 231 may be one of red ink particles, green ink particles and blue ink particles, and the second color ink particles 232 may be one of red ink particles, green ink particles and blue ink particles, so that the colors of the first color ink particles 231 and the second color ink particles 232 are selected according to the color requirements of the first-side display full-color screen and the second-side display dual-color screen.

In this embodiment, a driving method is also provided for driving the reflective display panel described above, and the following description will take as an example that the first color ink particles 231 are negatively charged and the second color ink particles 232 are positively charged. The driving method comprises the following steps:

Fig. 7 is a schematic diagram of a reflective display device in a black state according to an embodiment of the invention. As shown in fig. 7, the liquid crystal box 10 and the electronic ink screen 20 are controlled to be in a closed state, for example, after the first color ink particles 231 (black ink particles) are close to the second array substrate 22, the electronic ink screen 20 is closed, so that the reflective display device is in a pure black state on the first surface and the second surface.

Fig. 8 is a schematic structural diagram of a reflective display device according to an embodiment of the invention when displaying a black-and-white screen on the second surface. As shown in fig. 8, when the two-color screen is displayed on the second side alone, the liquid crystal cell 10 is controlled to turn off and turn on the electronic ink screen 20, and the electronic ink screen 20 displays the two-color screen toward the second side. For the second pixel unit P2 of the electronic ink screen 20 displaying the first color (black) toward the second surface, a negative voltage (e.g., -10 to-20V) is applied to the second common electrode 211, a positive voltage (e.g., +10 to +20v) is applied to the second pixel electrode 221, the electric field direction between the second pixel electrode 221 and the second common electrode 211 faces upward, the first color ink particles 231 move downward and concentrate on the side near the second pixel electrode 221, the second color ink particles 232 move upward and concentrate on the side near the second common electrode 211, and the black ink particles absorb light incident from the second surface, thereby rendering black. For the second pixel unit P2 in which the electronic ink screen 20 displays the second color (white) toward the second surface, a positive voltage (for example, +10 to +20v) is applied to the second common electrode 211, a negative voltage (for example, -10 to-20V) is applied to the second pixel electrode 221, the electric field direction between the second pixel electrode 221 and the second common electrode 211 faces downward, the second color ink particles 232 move downward and concentrate on the side near the second pixel electrode 221, the first color ink particles 231 move upward and concentrate on the side near the second common electrode 211, and the white ink particles reflect light incident from the second surface, thereby rendering white. The reflective display device is caused to display a two-color picture (black-and-white picture) toward the second face with the combination of the black and white second pixel units P2.

Fig. 9 is a schematic structural diagram of a reflective display device according to an embodiment of the invention when the first surface is in a white state. Fig. 10 is a schematic diagram illustrating an optical path analysis of the reflective display device in the first aspect of the embodiment of the invention when the reflective display device displays a white state. As shown in fig. 9 and 10, when the first surface is in the white state, the liquid crystal cell 10 is controlled to open and close the electronic ink screen 20, for example, after the first color ink particles 231 (black ink particles) are close to the second array substrate 22, the electronic ink screen 20 is closed, so that the reflective display device is in the pure black state on the second surface. After the light beam entering from the first surface passes through the long-pass filter 141, the light beam can transmit red and green light and reflect blue light, and the red and green light is reflected back by the white ink particles; after passing through the short-pass filter 14, the light incident on the first surface can transmit blue light and reflect red-green light, and the blue light is reflected back by the white ink particles, so that the single first pixel unit P1 can display white.

Fig. 11 is a schematic structural diagram of a reflective display device according to an embodiment of the invention when a full-color image is displayed on a first surface. Fig. 12 is a schematic view illustrating an optical path analysis when the reflective display device displays a full-color image on the first surface according to the first embodiment of the invention. As shown in fig. 11 and 12, when the full-color screen is displayed on the first surface, the liquid crystal cell 10 is controlled to turn on and off the electronic ink screen 20, and the liquid crystal cell 10 displays the full-color screen toward the first surface. All black ink particles in the ink capsules 23 of the electronic ink screen 20 face the liquid crystal cell 10, for example, after the first color ink particles 231 (black ink particles) approach the second opposite substrate 21, the electronic ink screen 20 is turned off, so that the reflective display device is in a pure white state on the second surface. After the light beam entering from the first surface passes through the long-pass filter 141, the light beam can transmit red and green light and reflect blue light, and the red and green light is absorbed by the black ink particles, so that the first sub-pixel SP1 displays blue; and the light incident on the first surface passes through the short-pass filter 14, and then transmits blue light and reflects red-green light, and the blue light is absorbed by the black ink particles, so that the second and third sub-pixels SP2 and SP3 display red-green (yellow) colors. The first subpixel SP1 is controlled to display the gray-scale brightness of blue and the second subpixel SP2 and the third subpixel SP3 are controlled to display the gray-scale brightness of red and green by the dye liquid crystal layer 13, so that the first surface of the reflective display device displays a full-color picture.

When the full-color image is displayed on the first surface and the dual-color image is displayed on the second surface, the liquid crystal box 10 and the electronic ink screen 20 are controlled to be opened, the liquid crystal box 10 displays the full-color image towards the first surface, and the electronic ink screen 20 displays the dual-color image towards the second surface. Under the cooperation of the electronic ink screen 20, the liquid crystal box 10 can make the color gamut of the first-side full-color display wider, but the patterns of the first-side full-color display and the second-side full-color display have mutual influence.

Example two

Fig. 13 is a schematic diagram of a reflective display device according to a second embodiment of the present invention when a full-color screen is displayed on a first surface and a dual-color screen is displayed on a second surface. Fig. 14 is a schematic view illustrating an optical path analysis when the reflective display device according to the second embodiment of the invention displays a full-color image on the first surface and a dual-color image on the second surface. As shown in fig. 13 and 14, the reflective display device and the driving method according to the second embodiment of the present invention are substantially the same as those of the first embodiment (fig. 1 to 12), except that in the present embodiment:

The first counter substrate 11 and the first array substrate 12 are all in a fully transparent state in a region corresponding to one of the first subpixel SP1, the second subpixel SP2, and the third subpixel SP3, and at least one of the first color ink particles 231 and the second color ink particles 232 is an ink particle of a color corresponding to the fully transparent state subpixel. In this embodiment, the first counter substrate 11 and the first array substrate 12 are all in a fully transparent state (i.e., light can completely pass through the first counter substrate 11 and the first array substrate 12, and light is not substantially reflected or absorbed), and the first counter substrate 11 and the first array substrate 12 are not provided with the bragg reflector and the filter gap layer in the region corresponding to the third sub-pixel SP 3. One of the first color ink particles 231 and the second color ink particles 232 is a black ink particle, and the other is a red ink particle. In this embodiment, the first color ink particles 231 are black ink particles, the second color ink particles 232 are red ink particles, and the red ink particles can reflect red light and absorb light of other colors. Therefore, the red light reflected by the red ink particles provides reflected light for the display of the third sub-pixel SP3 on the first surface, so that the third sub-pixel SP3 can independently display red, the color degree of the red ink particles reflecting the red light is better, and the display image quality can be increased.

The bragg reflection layer includes a long pass filter 141 and a short pass filter 142, the long pass filter 141 corresponding to the first subpixel SP1, the short pass filter 142 corresponding to the second subpixel SP2, the long pass filter 141 capable of transmitting red green light and reflecting blue light, and the short pass filter 142 capable of transmitting blue light and reflecting red green light. In the projection direction of the first array substrate 12, the short-pass filter 142 has no overlapping area with the third subpixel SP 3.

Further, the first opposite substrate 11 is provided with a green gap layer 113g in a region corresponding to the second sub-pixel SP2, the green gap layer 113g has a plurality of slits with a width of 500-570 nm, the green gap layer 113g can transmit green light and absorb red and blue light, that is, the red and blue light is absorbed by the green gap layer 113g when passing through the first opposite substrate 11, the incident light on the first surface cannot irradiate the electronic ink screen 20, and the influence of the electronic ink screen 20 on the full-color picture display on the first surface is reduced. The short-pass filter 142 is used only to reflect green light, thereby providing the second subpixel SP2 with reflected green light for display on the first side, so that the second subpixel SP2 can display green alone. Of course, in other embodiments, the first opposite substrate 11 may be further provided with a blue light gap layer 113b in a region corresponding to the first sub-pixel SP1, the blue light gap layer 113b has a plurality of slits with a width of 630-780 nm, the blue light gap layer 113b may transmit blue light and absorb red-green light, that is, the red-green light is absorbed by the blue light gap layer 113b when the first opposite substrate 11, and the incident light of the first surface cannot be irradiated to the electronic ink screen 20.

The filter gap layers (blue light gap layer 113b and green light gap layer 113 g) are formed by providing filter gap layers having different thicknesses and different gap widths on the first counter substrate 11 based on the principle of interference of light, and the filter gap layers may be etched by a nanoimprint technique or a photolithography technique. Therefore, the light with different colors can be filtered, the technical effect of filtering is realized, and the structure is simple and the cost is low.

As shown in fig. 13 and 14, when the full-color screen is displayed on the first side and the two-color screen is displayed on the second side, the liquid crystal cell 10 and the electronic ink screen 20 are both controlled to be turned on, the liquid crystal cell 10 displays the full-color screen toward the first side, and the electronic ink screen 20 displays the two-color screen (red-black screen) toward the second side. In this embodiment, the second sub-pixel SP2 may display green color alone, and the third sub-pixel SP3 may display red color alone, so that the color gamut of the full-color screen displayed on the first surface is wider than that of the first surface. Moreover, the color displayed by the second subpixel SP2 is not affected by the electronic ink 20, and the mutual effect of the patterns of the full-color screen displayed on the first surface and the dual-color screen displayed on the second surface is reduced.

In the electronic ink screen 20, when a voltage of negative polarity (e.g., -10 to-20V) is applied to the second common electrode 211 in the corresponding second pixel unit P2 and a voltage of positive polarity (e.g., +10 to +20v) is applied to the second pixel electrode 221, the electric field between the second pixel electrode 221 and the second common electrode 211 is directed upward, the first color ink particles 231 move downward and concentrate on the side near the second pixel electrode 221, and the second color ink particles 232 move upward and concentrate on the side near the second common electrode 211. If a positive voltage (for example, +10 to +20v) is applied to the second common electrode 211 in the corresponding second pixel unit P2, a negative voltage (for example, -10 to-20V) is applied to the second pixel electrode 221, the electric field direction between the second pixel electrode 221 and the second common electrode 211 is directed downward, the second color ink particles 232 move downward and concentrate on the side near the second pixel electrode 221, and the first color ink particles 231 move upward and concentrate on the side near the second common electrode 211. I.e., the electronic ink screen 20 is driven in substantially the same manner as in the first embodiment, except that the first color ink particles 231 and the second color ink particles 232 are selected to be different in color, i.e., the color of the reflected light is different.

Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first embodiment, and will not be described herein.

Example III

Fig. 15 is a schematic structural diagram of a reflective display device according to a third embodiment of the present invention when a full-color screen is displayed on a first surface and a dual-color screen is displayed on a second surface. Fig. 16 is a schematic view illustrating an optical path analysis when the reflective display device according to the third embodiment of the present invention displays a full-color screen on the first surface and a dual-color screen on the second surface. As shown in fig. 15 and 16, the reflective display device and the driving method according to the second embodiment of the present invention are substantially the same as those of the first embodiment (fig. 1 to 12), except that in the present embodiment:

The first counter substrate 11 and the first array substrate 12 are all in a fully transparent state in a region corresponding to one of the first subpixel SP1, the second subpixel SP2, and the third subpixel SP3, and at least one of the first color ink particles 231 and the second color ink particles 232 is an ink particle of a color corresponding to the fully transparent state subpixel. In this embodiment, the first counter substrate 11 and the first array substrate 12 are all in a fully transparent state (i.e., light can completely pass through the first counter substrate 11 and the first array substrate 12, and light is not substantially reflected or absorbed), and the first counter substrate 11 and the first array substrate 12 are not provided with the bragg reflector and the filter gap layer in the region corresponding to the second sub-pixel SP 2. One of the first color ink particles 231 and the second color ink particles 232 is a black ink particle, and the other is a green ink particle. In this embodiment, the first color ink particles 231 are black ink particles, the second color ink particles 232 are green ink particles, and the green ink particles can reflect green light and absorb light of other colors. Therefore, the green light reflected by the green ink particles provides reflected light for the display of the second sub-pixel SP2 on the first surface, so that the second sub-pixel SP2 can independently display green, and the green ink particles have better color degree of reflecting the green light, thereby increasing the display image quality.

The bragg reflection layer includes a long pass filter 141 and a short pass filter 142, the long pass filter 141 corresponding to the first subpixel SP1, the short pass filter 142 corresponding to the third subpixel SP3, the long pass filter 141 capable of transmitting red green light and reflecting blue light, and the short pass filter 142 capable of transmitting blue light and reflecting red green light. In the projection direction of the first array substrate 12, the short-pass filter 142 does not overlap with the second sub-pixel SP 2.

Further, the first counter substrate 11 is provided with a blue light gap layer 113b in a region corresponding to the first subpixel SP1, and a red light gap layer 113r in a region corresponding to the third subpixel SP 3. The blue gap layer 113b has a plurality of slits having a width of 630 to 780nm, and the blue gap layer 113b may transmit blue light and absorb red-green light, so that the first subpixel SP1 may display blue color alone. The red light gap layer 113r may have a plurality of slits having a width of 420 to 470nm, and the red light gap layer 113r may transmit red light and absorb blue-green light so that the third subpixel SP3 may individually display red. That is, the blue light gap layer 113b and the red light gap layer 113r absorb the red light, the green light and the blue light when passing through the first opposite substrate 11, so that the incident light on the first surface cannot irradiate the electronic ink screen 20, and the influence of the electronic ink screen 20 on the full-color image display on the first surface is reduced.

The filter gap layers (blue gap layer 113b and red gap layer 113 r) are formed by providing filter gap layers having different thicknesses and different gap widths on the first counter substrate 11 based on the principle of interference of light, and the filter gap layers may be etched by a nanoimprint technique or a photolithography technique. Therefore, the light with different colors can be filtered, the technical effect of filtering is realized, and the structure is simple and the cost is low.

As shown in fig. 15 and 16, when the full-color screen is displayed on the first side and the two-color screen is displayed on the second side, the liquid crystal cell 10 and the electronic ink screen 20 are both controlled to be turned on, the liquid crystal cell 10 displays the full-color screen toward the first side, and the electronic ink screen 20 displays the two-color screen (green-black screen) toward the second side. In this embodiment, the second sub-pixel SP2 may display green color alone, and the third sub-pixel SP3 may display red color alone, so that the color gamut of the full-color screen displayed on the first surface is wider than that of the first surface. Moreover, the colors displayed by the first subpixel SP1 and the third subpixel SP3 are not affected by the electronic ink 20, and the mutual effect of the patterns of the first-side display full-color picture and the second-side display dual-color picture is reduced.

In another embodiment, the first counter substrate 11 and the first array substrate 12 may be in a fully transparent state (i.e., the light may completely pass through the first counter substrate 11 and the first array substrate 12, and substantially not reflect and absorb the light), and the first counter substrate 11 and the first array substrate 12 may not be provided with the bragg reflector and the filter gap layer in the region corresponding to the first subpixel SP 1. One of the first color ink particles 231 and the second color ink particles 232 is a black ink particle, and the other is a blue ink particle. The bragg reflection layer includes a short-pass filter 142, the short-pass filter 142 corresponding to the second subpixel SP2 and the third subpixel SP3, the short-pass filter 142 being capable of transmitting blue light and reflecting red-green light. Since the first subpixel SP1 realizes color display by blue light reflected by the blue ink particles, the region corresponding to the first subpixel SP1 does not need to be provided with the long pass filter 141.

Example IV

Fig. 17 is a schematic diagram of a reflective display device according to a fourth embodiment of the present invention when a full-color screen is displayed on a first side and a dual-color screen is displayed on a second side. Fig. 18 is a schematic view illustrating an optical path analysis when the reflective display device according to the fourth embodiment of the present invention displays a full-color screen on the first surface and a dual-color screen on the second surface. As shown in fig. 17 and 18, the reflective display device and the driving method according to the fourth embodiment of the present invention are substantially the same as those of the first embodiment (fig. 1 to 12), except that in the present embodiment:

The first counter substrate 11 and the first array substrate 12 are in a fully transparent state in the region corresponding to two of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3, and at least one of the first color ink particles 231 and the second color ink particles 232 is an ink particle of a color corresponding to the fully transparent state sub-pixel. In this embodiment, the first counter substrate 11 and the first array substrate 12 are in a fully transparent state (i.e., light can completely pass through the first counter substrate 11 and the first array substrate 12 and substantially not reflect light and absorb light) in the areas corresponding to the second sub-pixel SP2 and the third sub-pixel SP3, and the first counter substrate 11 and the first array substrate 12 are not provided with the bragg reflector and the filter gap layer in the areas corresponding to the second sub-pixel SP2 and the third sub-pixel SP 3. One of the first color ink particles 231 and the second color ink particles 232 is a red ink particle, and the other is a green ink particle. In this embodiment, the first color ink particles 231 are red ink particles, which can reflect red light and absorb light of other colors; the second color ink particles 232 are green ink particles, which can reflect green light and absorb light of other colors. Thereby providing the third subpixel SP3 with reflected light for the display of the first side by the red light reflected by the red ink particles so that the third subpixel SP3 may display red alone; and providing the second subpixel SP2 with reflected light for the display of the first side by the green light reflected by the green ink particles so that the second subpixel SP2 may display green alone. And the red ink particles reflect red light and the green ink particles reflect green light to have better color degree, so that the display image quality can be improved.

The bragg reflection layer includes a long-pass filter 141, and the long-pass filter 141 corresponds to the first subpixel SP1, and the long-pass filter 141 is capable of transmitting red-green light and reflecting blue light. Since the second and third sub-pixels SP2 and SP3 realize color display by the green light reflected by the green ink particles and the red light reflected by the red ink particles, respectively, the areas corresponding to the second and third sub-pixels SP2 and SP3 do not need to be provided with the short-pass filter 142.

Further, the first counter substrate 11 is provided with a blue light gap layer 113b in a region corresponding to the first subpixel SP1, and a red light gap layer 113r in a region corresponding to the third subpixel SP 3. The blue gap layer 113b has a plurality of slits having a width of 630 to 780nm, and the blue gap layer 113b may transmit blue light and absorb red-green light, so that the first subpixel SP1 may display blue color alone. That is, the blue-light gap layer 113b absorbs the red-green light when the first opposite substrate 11 is used, the incident light on the first surface cannot irradiate the electronic ink screen 20, and the influence of the electronic ink screen 20 on the full-color picture display on the first surface is reduced.

The filter gap layer (red light gap layer 113 r) is formed by providing a filter gap layer having a different thickness and a different gap width on the first counter substrate 11 based on the principle of interference of light, and the filter gap layer can be etched by a nanoimprint technique or a photolithography technique. Therefore, the light with different colors can be filtered, the technical effect of filtering is realized, and the structure is simple and the cost is low.

As shown in fig. 17 and 18, when the full-color screen is displayed on the first side and the two-color screen is displayed on the second side, the liquid crystal cell 10 and the electronic ink screen 20 are both controlled to be turned on, the liquid crystal cell 10 displays the full-color screen toward the first side, and the electronic ink screen 20 displays the two-color screen (red-green screen) toward the second side. In this embodiment, the first subpixel SP1 may display blue color alone, the second subpixel SP2 may display green color alone, and the third subpixel SP3 may display red color alone, so that the color gamut of the full-color screen displayed on the first surface is wider than that of the first embodiment. Moreover, the color displayed by the first subpixel SP1 is not affected by the electronic ink 20, and the mutual effect of the patterns of the full-color screen displayed on the first surface and the two-color screen displayed on the second surface is reduced.

In another embodiment, the first counter substrate 11 and the first array substrate 12 may be in a fully transparent state (i.e., the light may completely pass through the first counter substrate 11 and the first array substrate 12 and substantially not reflect and absorb the light) in the areas corresponding to the first sub-pixel SP1 and the second sub-pixel SP2, and the first counter substrate 11 and the first array substrate 12 may not be provided with the bragg reflector and the filter gap layer in the areas corresponding to the first sub-pixel SP1 and the second sub-pixel SP 2. One of the first color ink particles 231 and the second color ink particles 232 is a green ink particle, and the other is a blue ink particle. The bragg reflection layer includes a short-pass filter 142, the short-pass filter 142 corresponding to the third sub-pixel SP3, the short-pass filter 142 being capable of transmitting blue light and reflecting red-green light. Alternatively, the first counter substrate 11 and the first array substrate 12 may be in a fully transparent state in the region corresponding to the first subpixel SP1 and the third subpixel SP3 (i.e., the light may completely pass through the first counter substrate 11 and the first array substrate 12 and substantially not reflect or absorb the light), and the first counter substrate 11 and the first array substrate 12 may not be provided with the bragg reflector and the filter gap layer in the region corresponding to the first subpixel SP1 and the third subpixel SP 3. One of the first color ink particles 231 and the second color ink particles 232 is a red ink particle, and the other is a blue ink particle. The bragg reflection layer includes a short-pass filter 142, the short-pass filter 142 corresponding to the second sub-pixel SP2, the short-pass filter 142 being capable of transmitting blue light and reflecting red-green light.

Example five

Fig. 19 is a schematic diagram of a reflective display device according to a fifth embodiment of the present invention when a full-color screen is displayed on a first surface and a dual-color screen is displayed on a second surface. Fig. 20 is a schematic view illustrating an optical path analysis when a reflective display device displays a full-color image on a first surface and a dual-color image on a second surface. As shown in fig. 19 and 20, the reflective display device and the driving method according to the fifth embodiment of the present invention are substantially the same as those of the first embodiment (fig. 1 to 12), except that in the present embodiment:

The first counter substrate 11 is provided with a blue light gap layer 113b in a region corresponding to the first subpixel SP1, and/or a green light gap layer 113g in a region corresponding to the second subpixel SP2, and/or a red light gap layer 113r in a region corresponding to the third subpixel SP 3. In the present embodiment, the first counter substrate 11 is provided with a blue light gap layer 113b in a region corresponding to the first subpixel SP1, a green light gap layer 113g in a region corresponding to the second subpixel SP2, and a red light gap layer 113r in a region corresponding to the third subpixel SP 3. The blue gap layer 113b has a plurality of slits having a width of 630 to 780nm, and the blue gap layer 113b may transmit blue light and absorb red-green light, so that the first subpixel SP1 may display blue color alone. The green gap layer 113g has a plurality of slits having a width of 500 to 570nm, and the green gap layer 113g may transmit green light and absorb red and blue light, so that the first subpixel SP1 may display green alone. The red light gap layer 113r may have a plurality of slits having a width of 420 to 470nm, and the red light gap layer 113r may transmit red light and absorb blue-green light so that the third subpixel SP3 may individually display red. That is, the blue light gap layer 113b, the green light gap layer 113g and the red light gap layer 113r absorb the red light, the green light, the red light and the blue light respectively when the first opposite substrate 11, the incident light on the first surface cannot be irradiated to the electronic ink screen 20, and the influence of the electronic ink screen 20 on the full-color image display on the first surface can be completely avoided, so that the first pixel unit P1 and the second pixel unit P2 do not need to be mutually corresponding.

The filter gap layers (blue gap layer 113b, green gap layer 113g, and red gap layer 113 r) are formed by providing filter gap layers having different thicknesses and different gap widths on the first counter substrate 11 based on the principle of interference of light, and can be etched by nanoimprint or photolithography. Therefore, the light with different colors can be filtered, the technical effect of filtering is realized, and the structure is simple and the cost is low.

As shown in fig. 19 and 20, when the full-color screen is displayed on the first side and the two-color screen is displayed on the second side, the liquid crystal cell 10 and the electronic ink screen 20 are both controlled to be turned on, the liquid crystal cell 10 displays the full-color screen on the first side, and the electronic ink screen 20 displays the two-color screen (black-and-white screen) on the second side. In this embodiment, the first subpixel SP1 may display blue color alone, the second subpixel SP2 may display green color alone, and the third subpixel SP3 may display red color alone, so that the color gamut of the full-color screen displayed on the first surface is wider than that of the first embodiment. Moreover, the colors displayed by the first subpixel SP1, the second subpixel SP2 and the third subpixel SP3 are not affected by the electronic ink screen 20, so that the mutual influence effect of the patterns of the full-color image displayed on the first surface and the double-color image displayed on the second surface is completely avoided, that is, the full-color image displayed on the first surface by the liquid crystal box 10 and the double-color image displayed on the second surface by the electronic ink screen 20 are mutually independent and cannot be mutually influenced; the colors of the first color ink particles 231 and the second color ink particles 232 do not affect the full-color screen displayed on the first surface, but only affect the color of the two-color screen displayed on the second surface. Therefore, when the full-color picture is displayed on the second side alone, the liquid crystal cell 10 is controlled to turn on and off the electronic ink screen 20; or the second side alone displays a two-color picture, the liquid crystal cell 10 is controlled to be turned off and turned on the electronic ink screen 20.

In this document, terms such as up, down, left, right, front, rear, etc. are defined by the positions of the structures in the drawings and the positions of the structures with respect to each other, for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the claimed application. It should also be understood that the terms "first" and "second," etc., as used herein, are used merely for distinguishing between names and not for limiting the number and order.

The present invention is not limited to the preferred embodiments, and the present invention is described above in any way, but is not limited to the preferred embodiments, and any person skilled in the art will appreciate that the present invention is not limited to the embodiments described above, when the technical content disclosed above can be utilized to make a little change or modification, the technical content disclosed above is equivalent to the equivalent embodiment of the equivalent change, but any simple modification, equivalent change and modification made to the above embodiment according to the technical substance of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A reflective display device, comprising a liquid crystal cell (10) and an electronic ink screen (20) arranged on top of each other, said liquid crystal cell (10) being adjacent to a first face of said reflective display device, said electronic ink screen (20) being adjacent to a second face of said reflective display device;

The liquid crystal box (10) comprises a first opposite substrate (11), a first array substrate (12) arranged opposite to the first opposite substrate (11) and a dye liquid crystal layer (13) arranged between the first opposite substrate (11) and the first array substrate (12), the liquid crystal box (10) is provided with a plurality of first pixel units (P1) distributed in an array, the first pixel units (P1) are provided with first sub-pixels (SP 1), second sub-pixels (SP 2) and third sub-pixels (SP 3), the first array substrate (12) is provided with first pixel electrodes (121) and Bragg reflection layers, at least one of the first sub-pixels (SP 1), the second sub-pixels (SP 2) and the third sub-pixels (SP 3) corresponds to the Bragg reflection layers, and the first opposite substrate (11) is provided with first common electrodes (111) matched with the first pixel electrodes (121);

The electronic ink screen (20) comprises a second opposite substrate (21), a second array substrate (22) which is arranged opposite to the second opposite substrate (21) and an ink capsule (23) which is arranged between the second opposite substrate (21) and the second array substrate (22), wherein all the ink capsules (23) are internally provided with first color ink particles (231) and second color ink particles (232) with opposite polarities, the second array substrate (22) is provided with a second pixel electrode (221), and the second opposite substrate (21) is provided with a second common electrode (211) which is matched with the second pixel electrode (221).

2. The reflective display device according to claim 1, wherein the bragg reflection layer comprises a long-pass filter (141) and a short-pass filter (142), the long-pass filter (141) corresponding to the first subpixel (SP 1), the short-pass filter (142) corresponding to the second subpixel (SP 2) and the third subpixel (SP 3), the long-pass filter (141) being capable of transmitting red-green light and reflecting blue light, the short-pass filter (142) being capable of transmitting blue light and reflecting red-green light.

3. The reflective display device according to claim 2, wherein the first color ink particles (231) are one of black ink particles, white ink particles, red ink particles, green ink particles, and blue ink particles, the second color ink particles (232) are one of black ink particles, white ink particles, red ink particles, green ink particles, and blue ink particles, and the first color ink particles (231) and the second color ink particles (232) are ink particles of different colors.

4. The reflective display device according to claim 2, wherein the first counter substrate (11) is provided with a blue light gap layer (113 b) in a region corresponding to the first sub-pixel (SP 1), and/or with a green light gap layer (113 g) in a region corresponding to the second sub-pixel (SP 2), and/or with a red light gap layer (113 r) in a region corresponding to the third sub-pixel (SP 3).

5. The reflective display device according to claim 1, wherein the electronic ink screen (20) has a plurality of second pixel units (P2) distributed in an array, and the first pixel units (P1) are in one-to-one correspondence with the second pixel units (P2).

6. The reflective display device according to claim 5, wherein the first counter substrate (11) and the first array substrate (12) are each in a fully transparent state in a region corresponding to the first sub-pixel (SP 1), one of the first color ink particles (231) and the second color ink particles (232) is a black ink particle, the other is a blue ink particle, the bragg reflection layer includes a short-pass filter (142), the short-pass filter (142) corresponds to the second sub-pixel (SP 2) and the third sub-pixel (SP 3), and the short-pass filter (142) is capable of transmitting blue light and reflecting red green light;

Or, the first counter substrate (11) and the first array substrate (12) are in a full transparent state in a region corresponding to the second sub-pixel (SP 2), one of the first color ink particles (231) and the second color ink particles (232) is a black ink particle, the other is a green ink particle, the bragg reflection layer includes a long-pass filter (141) and a short-pass filter (142), the long-pass filter (141) corresponds to the first sub-pixel (SP 1), the short-pass filter (142) corresponds to the third sub-pixel (SP 3), the long-pass filter (141) is capable of transmitting red green light and reflecting blue light, and the short-pass filter (142) is capable of transmitting blue light and reflecting red green light;

Or, the first counter substrate (11) and the first array substrate (12) are in a full transparent state in a region corresponding to the third sub-pixel (SP 3), one of the first color ink particles (231) and the second color ink particles (232) is a black ink particle, the other is a red ink particle, the bragg reflection layer comprises a long-pass filter (141) and a short-pass filter (142), the long-pass filter (141) corresponds to the first sub-pixel (SP 1), the short-pass filter (142) corresponds to the second sub-pixel (SP 2), the long-pass filter (141) is capable of transmitting red green light and reflecting blue light, and the short-pass filter (142) is capable of transmitting blue light and reflecting red green light.

7. The reflective display device according to claim 5, wherein the first counter substrate (11) and the first array substrate (12) are all in a fully transparent state in a region corresponding to the first sub-pixel (SP 1) and the second sub-pixel (SP 2), one of the first color ink particles (231) and the second color ink particles (232) is a green ink particle, the other is a blue ink particle, the bragg reflection layer comprises a short-pass filter (142), the short-pass filter (142) corresponds to the third sub-pixel (SP 3), and the short-pass filter (142) is capable of transmitting blue light and reflecting red-green light;

Or, the first counter substrate (11) and the first array substrate (12) are in a full transparent state in a region corresponding to the first sub-pixel (SP 1) and the third sub-pixel (SP 3), one of the first color ink particles (231) and the second color ink particles (232) is a red ink particle, the other is a blue ink particle, the bragg reflection layer includes a short-pass filter (142), the short-pass filter (142) corresponds to the second sub-pixel (SP 2), and the short-pass filter (142) is capable of transmitting blue light and reflecting red and green light;

Or, the first counter substrate (11) and the first array substrate (12) are in a full transparent state in the areas corresponding to the second sub-pixel (SP 2) and the third sub-pixel (SP 3), one of the first color ink particles (231) and the second color ink particles (232) is a red ink particle, the other is a green ink particle, the bragg reflection layer comprises a long-pass filter (141), the long-pass filter (141) corresponds to the first sub-pixel (SP 1), and the long-pass filter (141) can transmit red green light and reflect blue light.

8. A driving method of a reflective display device, characterized in that it is used for driving the reflective display device according to any one of claims 1 to 7, the driving method comprising:

when the two-color picture is displayed on the second surface alone, the liquid crystal box (10) is controlled to be closed and the electronic ink screen (20) is controlled to be opened, and the electronic ink screen (20) displays the two-color picture towards the second surface;

When the full-color picture is displayed on the first surface and the double-color picture is displayed on the second surface, the liquid crystal box (10) and the electronic ink screen (20) are controlled to be opened, the liquid crystal box (10) displays the full-color picture towards the first surface, and the electronic ink screen (20) displays the double-color picture towards the second surface.

9. The reflective display device and the driving method according to claim 8, wherein the bragg reflection layer includes a long-pass filter (141) and a short-pass filter (142), the long-pass filter (141) corresponding to the first subpixel (SP 1), the short-pass filter (142) corresponding to the second subpixel (SP 2) and the third subpixel (SP 3), the long-pass filter (141) being capable of transmitting red green light and reflecting blue light, the short-pass filter (142) being capable of transmitting blue light and reflecting red green light, one of the first color ink particles (231) and the second color ink particles (232) being black ink particles, the driving method comprising;

when the full-color picture is displayed on the first surface alone, the liquid crystal box (10) is controlled to be opened and closed, the electronic ink screen (20) is controlled, black ink particles in all ink capsules (23) in the electronic ink screen (20) face the liquid crystal box (10), and the liquid crystal box (10) displays the full-color picture towards the first surface.

10. The reflective display device and the driving method according to claim 8, wherein the bragg reflection layer includes a long-pass filter (141) and a short-pass filter (142), the long-pass filter (141) corresponds to the first subpixel (SP 1), the short-pass filter (142) corresponds to the second subpixel (SP 2) and the third subpixel (SP 3), the long-pass filter (141) is capable of transmitting red green light and reflecting blue light, the short-pass filter (142) is capable of transmitting blue light and reflecting red green light, the first counter substrate (11) is provided with a blue light gap layer (113 b) in a region corresponding to the first subpixel (SP 1), the second subpixel (SP 2) is provided with a green light gap layer (113 g), and the third subpixel (SP 3) is provided with a red light gap layer (113 r), the driving method comprising;

when the full-color picture is displayed on the first surface alone, the liquid crystal box (10) is controlled to be opened and closed, the electronic ink screen (20) is controlled to be opened and closed, and the liquid crystal box (10) displays the full-color picture towards the first surface.