CN110426886B - Liquid crystal display panel, driving method thereof and liquid crystal display device - Google Patents
Liquid crystal display panel, driving method thereof and liquid crystal display device Download PDFInfo
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- CN110426886B CN110426886B CN201910663399.4A CN201910663399A CN110426886B CN 110426886 B CN110426886 B CN 110426886B CN 201910663399 A CN201910663399 A CN 201910663399A CN 110426886 B CN110426886 B CN 110426886B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
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Abstract
The invention discloses a liquid crystal display panel, which comprises a first substrate, a second substrate arranged opposite to the first substrate and a liquid crystal layer positioned between the first substrate and the second substrate, wherein the first substrate is provided with a first polaroid, the second substrate is provided with a second polaroid, the first substrate is provided with a first quarter wave plate, the fast and slow axis of the first quarter wave plate and the first transmission axis of the first polaroid form 45 degrees, the second substrate is provided with a reflection electrode, the first substrate is provided with an auxiliary electrode opposite to the reflection electrode, the area of the liquid crystal display panel corresponding to the reflection electrode is a reflection area, the area of the liquid crystal display panel corresponding to each pixel unit is a transmission area, and the thickness of the liquid crystal layer corresponding to the reflection area is half of the thickness of the liquid crystal layer corresponding to the transmission area. The switching between the mirror reflection and the transmission is realized by controlling the corresponding liquid crystal molecules in the reflection area to change between the lying or standing postures. The invention also discloses a driving method and a liquid crystal display device.
Description
Technical Field
The present invention relates to the field of liquid crystal display technologies, and in particular, to a liquid crystal display panel, a driving method thereof, and a liquid crystal display device.
Background
With the development and progress of liquid crystal display technology, people have higher and higher requirements on liquid crystal display devices, and at present, a display device which can be used as a mirror and has a display function is favored, namely a mirror display device.
The existing mirror display device is usually prepared by coating a semi-reflective and semi-transparent film on the light emitted from the display panel, and when displaying, the light from the backlight source forms a color picture through the display panel to display; when the display is finished, the light from the external environment irradiates on the semi-reflecting and semi-transmitting film, and the mirror display can be realized.
The matching of the electro-optical characteristics between the transmissive mode and the reflective mode is a very important problem, and in order to solve the imbalance of the electro-optical response, sharp company compensates the transmissive mode and the reflective mode by using different cell gaps through the transflective lcd with the double cell thickness structure of the electrically controlled birefringence liquid crystal mode.
Although the liquid crystal display device in the related art realizes the functions of transmission and reflection, there are the following problems:
1. when in transmission display, the mirror reflection also exists at the same time, and can not be closed, thus having great influence on normal transmission display;
2. the double cell thickness design can reduce specular reflection during normal display, but increases thickness, cost, and process difficulty.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings of the prior art, an object of the present invention is to provide a liquid crystal display panel, a driving method thereof and a liquid crystal display device, so as to solve the problems of uncontrollable mirror reflection, large thickness and high cost of the liquid crystal display device in the prior art.
The purpose of the invention is realized by the following technical scheme:
the invention provides a liquid crystal display panel, which comprises a first substrate, a second substrate arranged opposite to the first substrate and a liquid crystal layer positioned between the first substrate and the second substrate, wherein the second substrate is defined by a plurality of scanning lines and a plurality of data lines which are mutually insulated and crossed on one side facing the liquid crystal layer, a plurality of pixel units are formed, each pixel unit is internally provided with a pixel electrode and a thin film transistor, the pixel electrode is electrically connected with the scanning lines and the data lines close to the thin film transistors through the thin film transistors, the first substrate is provided with a first polaroid, the second substrate is provided with a second polaroid, a first light transmission axis of the first polaroid is mutually vertical to a second light transmission axis of the second polaroid, the first substrate is provided with a first quarter-wave plate, a fast-slow axis of the first quarter-wave plate and the first light transmission axis of the first polaroid form an angle of 45 degrees, the second substrate is provided with a reflecting electrode at one side facing the liquid crystal layer, the first substrate is provided with an auxiliary electrode opposite to the reflecting electrode at one side facing the liquid crystal layer, the reflecting electrode at least covers the scanning lines and the data lines and extends along the directions of the scanning lines and the data lines, the area of the liquid crystal display panel corresponding to the reflecting electrode is a reflecting area, the area of the liquid crystal display panel corresponding to each pixel unit is a transmission area, and the thickness of the liquid crystal layer corresponding to the reflecting area is half of that of the liquid crystal layer corresponding to the transmission area.
Furthermore, a boss is arranged on the second substrate in a region corresponding to the reflection region, the boss and the reflection electrode have the same pattern, and the reflection electrode covers the boss.
Furthermore, the first quarter-wave plate is of a patterned structure, and the first quarter-wave plate and the reflective electrode are vertically aligned and have the same pattern.
Furthermore, the first quarter-wave plate is of a whole-surface structure, the second substrate is also provided with a second quarter-wave plate of a whole surface, and the fast axis and the slow axis of the second quarter-wave plate form a 45-degree angle with the second transmission axis of the second polaroid.
Further, the first quarter-wave plate is disposed between the first substrate and the auxiliary electrode.
Furthermore, a common electrode is further disposed on the second substrate, and the pixel electrode and the common electrode are located at different layers, or the pixel electrode and the common electrode are located at the same layer.
Furthermore, the auxiliary electrode is in a patterned structure, and the auxiliary electrode and the reflective electrode are overlapped up and down and have the same pattern.
Further, the auxiliary electrode is of a full-surface structure, and the pixel electrodes are distributed in each pixel unit in a block structure.
The present invention also provides a driving method for driving the liquid crystal display panel as described above, the driving method comprising:
when mirror reflection is needed, the transmission area is in a dark state, the reflection area is opened to be used as mirror display, and liquid crystal molecules in the corresponding liquid crystal layer in the reflection area are in a lying posture;
when normal display is needed, the reflection area is closed, the transmission area is in a normal transmission display mode, and liquid crystal molecules in the corresponding liquid crystal layer in the reflection area are in a standing posture.
The invention also provides a liquid crystal display device which comprises the liquid crystal display panel.
The invention has the beneficial effects that: the liquid crystal display panel comprises a first substrate, a second substrate and a liquid crystal layer, wherein the second substrate is arranged opposite to the first substrate, the liquid crystal layer is positioned between the first substrate and the second substrate, a first polaroid is arranged on the first substrate, a second polaroid is arranged on the second substrate, a first quarter wave plate is arranged on the first substrate, the fast-slow axis of the first quarter wave plate and the first light transmission axis of the first polaroid are 45 degrees, a reflecting electrode is arranged on the second substrate, an auxiliary electrode opposite to the reflecting electrode is arranged on the first substrate, the area of the liquid crystal display panel corresponding to the reflecting electrode is a reflecting area, the area of the liquid crystal display panel corresponding to each pixel unit is a transmission area, and the thickness of the liquid crystal layer corresponding to the reflecting area is half of that of the liquid crystal layer corresponding to the transmission area. The corresponding liquid crystal molecules in the reflecting area are changed between lying or standing postures by controlling the pressure difference between the reflecting electrode and the auxiliary electrode, so that the switching between mirror reflection and transmission is realized. When the liquid crystal display panel is normally displayed, the reflecting area presents a dark state and is used as a black matrix, and the aperture ratio of the liquid crystal display panel cannot be reduced. The thickness, cost and process difficulty are reduced relative to specular reflection for a dual box thickness design.
Drawings
FIG. 1 is a schematic plan view of a liquid crystal display panel according to the present invention;
FIG. 2 is a schematic plan view of a first substrate according to the present invention;
FIG. 3 is a schematic cross-sectional view illustrating a liquid crystal display panel in a reflective state according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the LCD panel of FIG. 3;
FIG. 5 is a schematic cross-sectional view illustrating a transmissive LCD panel according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of the LCD panel of FIG. 5;
FIG. 7 is a schematic cross-sectional view of a liquid crystal display panel in a transmissive state according to a second embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of a liquid crystal display panel in a transmissive state according to a third embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of an LCD panel in an initial state according to a fourth embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view illustrating a reflective liquid crystal display panel according to a fourth embodiment of the present invention;
FIG. 11 is a schematic cross-sectional view of a liquid crystal display panel in a transmissive state according to a fourth embodiment of the present invention;
FIG. 12 is a schematic cross-sectional view of a liquid crystal display panel in a transmissive state according to a fifth embodiment of the present invention;
fig. 13 is a schematic cross-sectional view of a transmissive liquid crystal display panel according to a sixth embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be made on the specific implementation, structure, features and effects of the liquid crystal display panel and the driving method thereof and the liquid crystal display device according to the present invention with reference to the accompanying drawings and preferred embodiments as follows:
[ example one ]
As shown in fig. 1 to 6, a liquid crystal display panel according to a first embodiment of the present invention includes a first substrate 10, a second substrate 20 disposed opposite to the first substrate 10, and a liquid crystal layer 30 disposed between the first substrate 10 and the second substrate 20, where the second substrate 20 is defined by a plurality of scan lines 1 and a plurality of data lines 2 crossing each other in an insulated manner on a side facing the liquid crystal layer 30 to form a plurality of pixel units P, each pixel unit P is provided with a pixel electrode 23 and a thin film transistor 3, and the pixel electrode 23 is electrically connected to the scan lines 1 and the data lines 2 adjacent to the thin film transistor 3 through the thin film transistor 3, where the first substrate 10 is a color film substrate, the second substrate 20 is an array substrate, the thin film transistor 3 includes a gate electrode, a source electrode, and a drain electrode, and the source electrode and the drain electrode are connected through a semiconductor layer. In this embodiment, the liquid crystal layer 30 adopts positive liquid crystal molecules (liquid crystal molecules with positive dielectric anisotropy), and the positive liquid crystal molecules in the liquid crystal layer 30 are aligned in parallel with the color film substrate and the array substrate.
The first substrate 10 is provided with a first polarizer 40, the second substrate 20 is provided with a second polarizer 50, and a first transmission axis X1 of the first polarizer 40 is perpendicular to a second transmission axis X2 of the second polarizer 50. In the present embodiment, the first polarizer 40 is located on the outer side of the first substrate 10 (the side away from the liquid crystal layer 30), and the second polarizer 50 is located on the outer side of the second substrate 20 (the side away from the liquid crystal layer 30), but the present invention is not limited thereto.
The first substrate 10 is provided with a first quarter-wave plate 13, the fast and slow axis X3 of the first quarter-wave plate 13 forms 45 degrees with the first transmission axis X1 of the first polarizer 40, the second substrate 20 is provided with a reflective electrode 25 at the side facing the liquid crystal layer 30, the first substrate 10 is provided with an auxiliary electrode 14 opposite to the reflective electrode 25 at the side facing the liquid crystal layer 30, the reflective electrode 25 at least covers the plurality of scanning lines 1 and the plurality of data lines 2 and extends along the plurality of scanning lines 1 and the plurality of data lines 2 (as shown in fig. 2), in the embodiment, the width of the reflective electrode 25 is larger than the widths of the scanning lines 1 and the data lines 2, and also covers a part of the pixel unit P, which functions as a Black Matrix (BM) in the conventional liquid crystal display device, for example, when the pixel electrode is in a block shape, the pixel electrode also covers the pixel electrode and the scanning lines 1, 2, and, The gap region of the data line 2. The area of the liquid crystal display panel corresponding to the reflective electrode 25 is a reflective area R, the area of the liquid crystal display panel corresponding to each pixel unit P is a transmissive area T (as shown in fig. 1), and the thickness of the liquid crystal layer 30 corresponding to the reflective area R is half of the thickness of the liquid crystal layer 30 corresponding to the transmissive area T. The reflection region R is made to correspond to a quarter-wave plate (lambda/4) in an initial state and has an effect of causing a quarter-phase retardation of the light passing therethrough, and the transmission region T is made to correspond to a half-wave plate (lambda/2) after a voltage is applied and has an effect of causing a half-phase retardation of the light passing therethrough.
In this embodiment, the second substrate 20 is provided with a boss 24 in a region corresponding to the reflective region R, the boss 24 and the reflective electrode 25 have the same pattern, and the reflective electrode 25 covers the boss 24. The first quarter-wave plate 13 is a patterned structure, and the first quarter-wave plate 13 and the reflective electrode 25 are aligned up and down and have the same pattern. In the present embodiment, the first quarter-wave plate 13 is disposed between the first substrate 10 and the auxiliary electrode 14. The sum of the thicknesses of the convex plate 24, the reflective electrode 25, the first quarter-wave plate 13 and the auxiliary electrode 14 is equal to half of the thickness of the liquid crystal layer 30 corresponding to the transmission region T, so that the transmission and reflection switching can be realized without changing the thickness of the conventional liquid crystal cell. Of course, in other embodiments, the first quarter-wave plate 13 may be located at other positions on the first substrate 10, but is not limited thereto.
The first substrate 10 is further provided with a color resistance material layer 11, and the color resistance material layer 11 includes color resistance materials of three colors of red (R), green (G), and blue (B), and correspondingly forms sub-pixels of the three colors of red (R), green (G), and blue (B). The flat layer 12 is further disposed between the first quarter-wave plate 13 and the color resistance material layer 11, and the reflection region R can control the light passing through, so that a Black Matrix (BM) is not required to be disposed on the first substrate 10 to block the backlight, that is, the reflection region R replaces the black matrix region in the prior art, and has the same light shielding function as the black matrix when performing transmissive display. In contrast, the Black Matrix (BM) blocks the ambient light, affecting the reflection effect of the reflective region R.
In the present embodiment, the second substrate 20 is further provided with a common electrode 21, the pixel electrode 23 and the common electrode 21 are located at different layers and separated by an insulating layer 22, the common electrode 21 can be located above or below the pixel electrode 23 (the common electrode 21 is located below the pixel electrode 23 in fig. 3), preferably, the common electrode 21 is a planar electrode arranged on the whole surface, and the pixel electrode 23 is a block electrode arranged in one block in each pixel region or a slit electrode having a plurality of electrode bars, so as to form a Fringe Field Switching (FFS) mode. Of course, In other embodiments, the pixel electrode 23 and the common electrode 21 may be located on the same layer, but they are spaced apart from each other, and each of the pixel electrode 23 and the common electrode 21 may include a plurality of electrode stripes, and the electrode stripes of the pixel electrode 23 and the electrode stripes of the common electrode 21 are alternately arranged with each other to form an In-Plane Switching (IPS) mode.
In the present embodiment, the auxiliary electrode 14 is a patterned structure, and the auxiliary electrode 14 and the reflective electrode 25 are aligned up and down and have the same pattern. That is, the auxiliary electrode 14 covers the entire surface of the first substrate 10, and an opening corresponding to the transmissive region T is formed by etching at a position corresponding to the transmissive region T.
The first substrate 10 and the second substrate 20 may be made of glass, acrylic, polycarbonate, or the like. The material of the pixel electrode 23, the common electrode 21, and the auxiliary electrode 14 may be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), or the like. The reflective electrode 25 of the reflective region R may be made of Al, Ag, or the like with high reflectivity.
The embodiment further provides a driving method, the driving method is used for driving the liquid crystal display panel, and the driving method includes:
when mirror reflection is required, the transmission region T is in a dark state, the reflection region R is opened to be used for mirror display, and liquid crystal molecules in the corresponding liquid crystal layer 30 in the reflection region R are in a lying posture;
when normal display is required, the reflective region R is turned off, the transmissive region T is in a normal transmissive display mode, and liquid crystal molecules in the reflective region R corresponding to the liquid crystal layer 30 are in a standing posture.
Referring to fig. 3 and 4, in the present embodiment, in the initial state, the positive liquid crystal molecules in the liquid crystal layer 30 are in a lying posture, and at this time, the liquid crystal layer 30 corresponding to the reflective region R is equivalent to a quarter-wave plate (λ/4), and since no driving voltage is applied to the pixel electrode 23 and the common electrode 21, the liquid crystal layer 30 corresponding to the transmissive region T does not have a polarization effect. The first ambient light I1 passes through the transmissive region T and is absorbed by the second polarizer 50, and the first backlight BL1 passes through the transmissive region T and is absorbed by the first polarizer 40, and the transmissive region T is in a dark state. In the reflection region R, the second ambient light I2 passes through the first polarizer 40 to become linearly polarized light, passes through the first quarter-wave plate 13 to become circularly polarized light (set to be left-handed), passes through the liquid crystal layer 30 (equivalent to a quarter-wave plate) to become linearly polarized light, while the linearly polarized light is irradiated on the reflection electrode 25 and is still linearly polarized light after being reflected without changing the polarization direction, passes through the liquid crystal layer 30 (equivalent to a quarter-wave plate) after being reflected to become circularly polarized light without changing the rotation direction (left-handed), and finally passes through the first quarter-wave plate 13 and the first polarizer 40 to exit the liquid crystal display panel to realize reflection, while the second backlight BL2 is absorbed or reflected by the reflection electrode 25, that is, the second backlight BL2 does not pass through the reflection region R. The liquid crystal display panel initially assumes a reflective state.
Referring to fig. 5 and 6, in the transmissive state, a normal driving voltage is applied to the pixel electrode 23 and the common electrode 21 to form a horizontal electric field E2, the positive liquid crystal molecules in the liquid crystal layer 30 corresponding to the transmissive region T are deflected in the horizontal direction, at this time, the liquid crystal layer 30 corresponding to the transmissive region T is equivalent to a half-wave plate (λ/2), the first ambient light I1 can pass through the transmissive region T without affecting normal display, the first backlight BL1 can pass through the transmissive region T and emit from the first polarizer 40, and at this time, the transmissive region T is in a normal display state. The auxiliary electrode 14 and the reflective electrode 25 apply corresponding driving voltages to form a vertical electric field E1, the positive liquid crystal molecules in the liquid crystal layer 30 corresponding to the reflective region R are in a standing state, at this time, the liquid crystal layer 30 corresponding to the reflective region R does not have a polarization effect, the second ambient light I2 passes through the first polarizer 40 to become linearly polarized light, passes through the first quarter-wave plate 13 to become circularly polarized light (set as left-handed), passes through the liquid crystal layer 30 (without polarization effect) or circularly polarized light (left-handed), and the circularly polarized light irradiates on the reflective electrode 25 and is reflected to be still circularly polarized light but with opposite rotation direction (right-handed), passes through the liquid crystal layer 30 (without polarization effect) or circularly polarized light (right-handed), finally passes through the first quarter-wave plate 13 to become linearly polarized light perpendicular to the first transmission axis X1 of the first polarizer 40, and is absorbed by the first polarizer 40, the second backlight source BL2 is absorbed or reflected by the reflective electrode 25, i.e. the second backlight source BL2 does not pass through the reflective region R, and the reflective region R is in a dark state and is used as a Black Matrix (BM). The liquid crystal display panel is in a transmissive state.
The liquid crystal display panel is switched between a transmissive state or a reflective state by controlling voltage signals applied to the pixel electrode 23, the common electrode 21, the auxiliary electrode 14, and the reflective electrode 25. In normal display, the reflective region R exhibits a dark state and is used as a Black Matrix (BM) without decreasing the aperture ratio of the liquid crystal display panel.
[ example two ]
As shown in fig. 7, a liquid crystal display panel according to a second embodiment of the present invention is substantially the same as the liquid crystal display panel according to the first embodiment (fig. 5), except that in the present embodiment, the first quarter-wave plate 13 is a full-surface structure, the second substrate 20 is further provided with a full-surface second quarter-wave plate 26, and a fast-slow axis of the second quarter-wave plate 26 is 45 ° to the second transmission axis X2 of the second polarizer 50. Because the entire first quarter-wave plate 13 is used, the second quarter-wave plate 26 needs to be attached to the second substrate 20 side to correspond to the first quarter-wave plate 13, so that the normal display of the transmissive region T is not affected. Of course, the second quarter-wave plate 26 only needs to correspond to the transmission region T, but this increases the etching process.
In this embodiment, the first quarter-wave plate 13 is disposed between the first substrate 10 and the auxiliary electrode 14, and the second quarter-wave plate 26 is disposed between the second substrate 20 and the second polarizer 50, however, the first quarter-wave plate 13 and the second quarter-wave plate 26 may also be disposed on other layers according to actual requirements, for example, the first quarter-wave plate 13 is disposed between the first substrate 10 and the color-resisting layer 11, and the second quarter-wave plate 26 is disposed between the second substrate 20 and the common electrode 21, which is not limited thereto.
Compared with the first embodiment, the first quarter-wave plate 13 in the present embodiment does not need to adopt an additional etching process, and compared with the etching process adopted for the first quarter-wave plate 13, the manufacturing time required for additionally increasing the second quarter-wave plate 26 is less, and the production efficiency is increased.
It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.
[ third example ]
As shown in fig. 8, a liquid crystal display panel according to a third embodiment of the present invention is substantially the same as the liquid crystal display panel according to the second embodiment (fig. 7), except that in this embodiment, the first quarter-wave plate 13 is disposed between the first substrate 10 and the first polarizer 40, and the second quarter-wave plate 26 is disposed between the second substrate 20 and the second polarizer 50, and of course, the first quarter-wave plate 13 and the second quarter-wave plate 26 may also be disposed in other layers according to actual requirements, for example, the first quarter-wave plate 13 is disposed between the first substrate 10 and the color-resist layer 11, and the second quarter-wave plate 26 is disposed between the second substrate 20 and the common electrode 21, which is not limited thereto.
Compared with the second embodiment, in the present embodiment, the first quarter-wave plate 13 is disposed outside the liquid crystal cell, that is, on the side of the first substrate 10 away from the liquid crystal layer 30, so that the difficulty of the manufacturing process can be reduced, and the cost can be reduced.
It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the present embodiment, and are not described herein again.
[ example four ]
As shown in fig. 9 to 11, the lcd panel according to the fourth embodiment of the present invention is substantially the same as the lcd panel according to the first embodiment (fig. 3 and 5), except that in the present embodiment, the auxiliary electrode 14 is in a whole-surface structure, and the pixel electrodes 23 are in a block structure and are distributed in each pixel unit P. The liquid crystal layer 30 uses negative liquid crystal molecules (liquid crystal molecules having negative dielectric anisotropy). With the technical progress, the performance of the negative liquid crystal is remarkably improved, and the application is more and more extensive. In this embodiment, as shown in fig. 8, in an initial state (i.e., in a state where no voltage is applied to the liquid crystal display device), the negative liquid crystal molecules in the liquid crystal layer 30 are perpendicular to the first substrate 10 and the second substrate 20, i.e., the negative liquid crystal molecules are in a standing posture in the initial state, and the auxiliary electrode 14 may form a vertical electric field with the reflective electrode 25 or a vertical electric field with the pixel electrode 23, thereby forming a VA display mode. In the initial state, the reflective region R and the transmissive region T are both in a dark state, i.e., the reflective region R has no reflective effect, and the transmissive region T has no backlight source passing through.
As shown in fig. 10, in the reflective state, the auxiliary electrode 14 and the reflective electrode 25 apply corresponding driving voltages to form a vertical electric field E1, and the negative liquid crystal molecules in the reflective region R corresponding to the crystal layer 30 are deflected to lie down and assume a reflective state. The pixel electrode 23 does not apply any voltage, and the transmissive region T is in a dark state. At this time, the liquid crystal display panel assumes a reflective state.
As shown in fig. 11, in the transmissive state, the auxiliary electrode 14 and the pixel electrode 23 are applied with corresponding driving voltages to form a vertical electric field E2, and the negative liquid crystal molecules in the transmissive region T corresponding to the crystal layer 30 are deflected to lie flat and assume a transmissive state. The reflective electrode 25 is used as a Black Matrix (BM) in a dark state without applying any voltage to the reflective region R. At this time, the liquid crystal display panel assumes a transmissive state.
Compared with the first embodiment, the VA display mode is adopted in this embodiment, so that the light leakage effect of the reflective region R can be reduced in the dark state, and the contrast ratio can be improved.
It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.
[ example five ]
As shown in fig. 12, a liquid crystal display panel according to a fifth embodiment of the present invention is substantially the same as the liquid crystal display panel according to the fourth embodiment (fig. 11), except that in this embodiment, the first quarter-wave plate 13 is a full-surface structure, the second substrate 20 is further provided with a full-surface second quarter-wave plate 26, and a fast-slow axis of the second quarter-wave plate 26 is 45 ° to the second transmission axis X2 of the second polarizer 50. Because the entire first quarter-wave plate 13 is used, the second quarter-wave plate 26 needs to be attached to the second substrate 20 side to correspond to the first quarter-wave plate 13, so that the normal display of the transmissive region T is not affected. Of course, the second quarter-wave plate 26 only needs to correspond to the transmission region T, but this increases the etching process.
In this embodiment, the first quarter-wave plate 13 is disposed between the first substrate 10 and the auxiliary electrode 14, and the second quarter-wave plate 26 is disposed between the second substrate 20 and the second polarizer 50, however, the first quarter-wave plate 13 and the second quarter-wave plate 26 may also be disposed on other layers according to actual requirements, for example, the first quarter-wave plate 13 is disposed between the first substrate 10 and the color-resisting layer 11, and the second quarter-wave plate 26 is disposed between the second substrate 20 and the common electrode 21, which is not limited thereto.
Compared with the fourth embodiment, the first quarter-wave plate 13 in the present embodiment does not need to adopt an additional etching process, and compared with the etching process adopted for the first quarter-wave plate 13, the manufacturing time required for additionally increasing the second quarter-wave plate 26 is less, and the production efficiency is increased.
Those skilled in the art should understand that the rest of the structure and the operation principle of the present embodiment are the same as those of the fourth embodiment, and are not described herein again.
[ sixth example ]
As shown in fig. 13, a liquid crystal display panel according to a sixth embodiment of the present invention is substantially the same as the liquid crystal display panel according to the fifth embodiment (fig. 12), except that in this embodiment, the first quarter-wave plate 13 is disposed between the first substrate 10 and the first polarizer 40, and the second quarter-wave plate 26 is disposed between the second substrate 20 and the second polarizer 50, and of course, the first quarter-wave plate 13 and the second quarter-wave plate 26 may also be disposed in other layers according to actual requirements, for example, the first quarter-wave plate 13 is disposed between the first substrate 10 and the color-resist layer 11, and the second quarter-wave plate 26 is disposed between the second substrate 20 and the common electrode 21, which is not limited thereto.
Compared with the fifth embodiment, in the present embodiment, the first quarter-wave plate 13 is disposed outside the liquid crystal cell, that is, on the side of the first substrate 10 away from the liquid crystal layer 30, so that the difficulty of the manufacturing process can be reduced, and the cost can be reduced.
Those skilled in the art should understand that the rest of the structure and the operation principle of the present embodiment are the same as those of the fifth embodiment, and are not described herein again.
The invention also provides a liquid crystal display device which comprises the liquid crystal display panel
In this document, the terms upper, lower, left, right, front, rear and the like are used for defining the positions of the structures in the drawings and the positions of the structures relative to each other, and are only used for the clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims. It is also to be understood that the terms "first" and "second," etc., are used herein for descriptive purposes only and are not to be construed as limiting in number or order.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A liquid crystal display panel comprises a first substrate (10), a second substrate (20) arranged opposite to the first substrate (10) and a liquid crystal layer (30) arranged between the first substrate (10) and the second substrate (20), wherein the second substrate (20) is provided with a plurality of scanning lines (1) and a plurality of data lines (2) on one side facing the liquid crystal layer (30) which are mutually insulated and crossed to form a plurality of pixel units (P), each pixel unit (P) is internally provided with a pixel electrode (23) and a thin film transistor (3), the pixel electrode (23) is electrically connected with the scanning lines (1) and the data lines (2) adjacent to the thin film transistor (3) through the thin film transistor (3), the first substrate (10) is provided with a first polaroid (40), the second substrate (20) is provided with a second polaroid (50), and a first light transmission axis (X1) of the first polaroid (40) is electrically connected with a second light transmission axis (X2) of the second polaroid (50) Perpendicular to each other, characterized in that, the first substrate (10) is provided with a first quarter-wave plate (13), the fast and slow axis (X3) of the first quarter-wave plate (13) and the first transmission axis (X1) of the first polarizer (40) form 45 degrees, the second substrate (20) is provided with a reflective electrode (25) at one side facing the liquid crystal layer (30), the first substrate (10) is provided with an auxiliary electrode (14) opposite to the reflective electrode (25) at one side facing the liquid crystal layer (30), the reflective electrode (25) completely covers the plurality of scanning lines (1) and the plurality of data lines (2) and extends along the directions of the plurality of scanning lines (1) and the plurality of data lines (2), the area of the liquid crystal display panel corresponding to the reflective electrode (25) is a reflective area (R), the area of the liquid crystal display panel corresponding to each pixel unit (P) is a transmissive area (T), the thickness of the liquid crystal layer (30) corresponding to the reflection region (R) is half of the thickness of the liquid crystal layer (30) corresponding to the transmission region (T);
when the mirror surface is reflected, the transmission area (T) is in a dark state, the reflection area (R) is opened to be used as mirror surface display, and liquid crystal molecules in the reflection area (R) corresponding to the liquid crystal layer (30) are in a lying posture;
in the transmissive display state, the reflective region (R) is in a dark state, the transmissive region (T) is in a normal transmissive display mode, and liquid crystal molecules in the reflective region (R) corresponding to the liquid crystal layer (30) are in a standing posture.
2. The lcd panel of claim 1, wherein the second substrate (20) is provided with a protrusion (24) at a region corresponding to the reflective region (R), the protrusion (24) and the reflective electrode (25) have the same pattern, and the reflective electrode (25) covers the protrusion (24).
3. The LCD panel of claim 1, wherein the first quarter-wave plate (13) is a patterned structure, and the first quarter-wave plate (13) and the reflective electrode (25) are aligned up and down and have the same pattern.
4. The lcd panel of claim 1, wherein the first quarter-wave plate (13) is a full-surface structure, and the second substrate (20) is further provided with a full-surface second quarter-wave plate (26), and the fast and slow axes of the second quarter-wave plate (26) are 45 ° to the second transmission axis (X2) of the second polarizer (50).
5. The lcd panel of claim 1, wherein the first quarter-wave plate (13) is disposed between the first substrate (10) and the auxiliary electrode (14).
6. The lcd panel of claim 1, wherein the second substrate (20) further comprises a common electrode (21), and the pixel electrode (23) and the common electrode (21) are located at different layers or the pixel electrode (23) and the common electrode (21) are located at the same layer.
7. The LCD panel of claim 6, wherein the auxiliary electrode (14) is a patterned structure, and the auxiliary electrode (14) and the reflective electrode (25) are overlapped and have the same pattern.
8. The panel according to claim 1, wherein the auxiliary electrode (14) has a full-area structure, and the pixel electrodes (23) have a block structure distributed in each pixel unit (P).
9. A driving method for driving the liquid crystal display panel according to any one of claims 1 to 8, the driving method comprising:
when mirror reflection is needed, the transmission area (T) is in a dark state, the reflection area (R) is opened to be used as mirror display, and liquid crystal molecules in the corresponding liquid crystal layer (30) in the reflection area (R) are in a lying posture;
when normal display is needed, the reflection region (R) is closed, the transmission region (T) is in a normal transmission display mode, and liquid crystal molecules in the corresponding liquid crystal layer (30) in the reflection region (R) are in a standing posture.
10. A liquid crystal display device comprising the liquid crystal display panel according to any one of claims 1 to 8.
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| CN111240076B (en) * | 2020-02-03 | 2022-08-09 | 京东方科技集团股份有限公司 | Transparent display device |
| CN113219716B (en) * | 2021-05-18 | 2023-03-21 | 昆山龙腾光电股份有限公司 | Display panel, display device and driving method |
| CN114935832A (en) * | 2022-05-26 | 2022-08-23 | 京东方科技集团股份有限公司 | Reflective 3D display module, display device and control method |
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