TWI779608B - Cholesterol liquid crystal display device and cholesterol liquid crystal display device manufacturing method - Google Patents

Abstract

A cholesteric liquid crystal display device includes a first light-absorbing layer, a first transparent substrate, a first cholesteric liquid crystal layer, a second transparent substrate, a second cholesteric liquid crystal layer, a third transparent substrate, a third cholesteric liquid crystal layer, and a fourth transparent substrate that are sequentially stacked from bottom to top. Electrode layers are arranged on both sides of the first cholesteric liquid crystal layer, the second cholesteric liquid crystal layer, and the third cholesteric liquid crystal layer. The second light-absorbing layer is arranged on one side of the second transparent substrate, and the third light-absorbing layer is arranged on one side of the third transparent substrate, both of which are used for absorbing light in a specific wavelength range. Thereby, the overall thickness of the cholesteric liquid crystal display device is small, which can save installation space.

Description

Cholesteric liquid crystal display device and manufacturing method thereof

The invention relates to the technical field of liquid crystal display, in particular to a cholesteric liquid crystal display device and a manufacturing method thereof.

Cholesteric liquid crystal display is a kind of liquid crystal display, in which cholesteric liquid crystal has bistable characteristics: that is to say, there are two stable states when no external force is applied, which is the biggest difference with the TFT liquid crystal display and OLED display commonly used today. difference.

The molecular arrangement of cholesteric liquid crystals has two stable states: focal conic state (Focal Conic State) and planar state (Planar State), so it has bistable characteristics, that is, cholesteric liquid crystals can maintain the original state without external energy. Alignment state of liquid crystal molecules. When a voltage is applied, the alignment state of the cholesteric liquid crystal molecules can be controlled to switch between the focal conic alignment state and the planar alignment state. As mentioned above, when the cholesteric liquid crystals are arranged in a planar state, light of a specific wavelength will be reflected; conversely, when the cholesteric liquid crystals are arranged in a focal conic state, the light will pass through. Therefore, the voltage applied to the cholesteric liquid crystal can be used to control whether the cholesteric liquid crystal is transmitted by light or reflects light of a specific wavelength.

For the existing cholesterol liquid crystal display, three independent cholesterol A liquid crystal module, wherein each cholesteric liquid crystal module includes an upper substrate, a lower substrate, and a cholesteric liquid crystal sandwiched between the upper and lower substrates, and then the three cholesteric liquid crystal modules are laminated by pasting to complete Fabrication of cholesteric liquid crystal displays. The overall thickness of the cholesteric liquid crystal display made in this way is relatively large, and the whole manufacturing process is relatively cumbersome and very inconvenient.

Therefore, the main purpose of the present invention is to provide a cholesteric liquid crystal display device and a manufacturing method thereof, so as to solve the above problems.

The object of the present invention is to provide a cholesteric liquid crystal display device and a manufacturing method thereof, which can reduce the overall thickness of the cholesteric liquid crystal display device, save installation space, and the overall manufacturing process is simple and convenient.

In order to achieve at least one of the above advantages or other advantages, an embodiment of the present invention proposes a cholesteric liquid crystal display device, which includes a first substrate, a second transparent substrate, a third transparent substrate, a fourth transparent substrate, sandwiched between The first cholesteric liquid crystal layer between the first substrate and the second transparent substrate, the second cholesteric liquid crystal layer interposed between the second transparent substrate and the third transparent substrate, the second cholesteric liquid crystal layer interposed between the third transparent substrate The third cholesteric liquid crystal layer between the fourth transparent substrate, the first light-absorbing layer arranged on the side of the first substrate away from the first cholesteric liquid crystal layer, the second light-absorbing layer arranged on one side of the second transparent substrate light absorbing layer, a third light absorbing layer disposed on one side of the third transparent substrate, a first lower electrode layer disposed on a side of the first substrate close to the first cholesteric liquid crystal layer, disposed on the second transparent substrate close to The first upper electrode layer on one side of the first cholesteric liquid crystal layer, the second lower electrode layer arranged on the side of the second transparent substrate close to the second cholesteric liquid crystal layer, and the second lower electrode layer arranged on the third transparent substrate close to the second transparent substrate The second upper electrode layer on one side of the cholesteric liquid crystal layer is disposed on a side of the third transparent substrate close to the third cholesteric liquid crystal layer The third lower electrode layer, the third upper electrode layer disposed on one side of the fourth transparent substrate close to the third cholesteric liquid crystal layer.

Wherein, the first cholesteric liquid crystal layer is used to generate a first color light, and the first color light has a first wavelength range. The second cholesteric liquid crystal layer is used to generate a second color light having a second wavelength range. The third cholesteric liquid crystal layer is used for generating a third color light having a third wavelength range. The first light absorbing layer is used for absorbing light. The second light absorbing layer is used for absorbing light in the second wavelength range. The third light absorbing layer is used for absorbing light in the third wavelength range. The electrode layers located on the upper and lower sides of each cholesteric liquid crystal layer are used to apply voltage to the cholesteric liquid crystal layer.

In some embodiments, the second light absorbing layer is located between the second transparent substrate and the second lower electrode layer, and the third light absorbing layer is located between the third transparent substrate and the third lower electrode layer.

In some embodiments, the second light absorbing layer is located between the second transparent substrate and the second lower electrode layer, and the third light absorbing layer is located between the third transparent substrate and the second upper electrode layer.

In some embodiments, the second light absorbing layer is located between the second transparent substrate and the first upper electrode layer, and the third light absorbing layer is located between the third transparent substrate and the second upper electrode layer.

In some embodiments, the second light absorbing layer is located between the second transparent substrate and the first upper electrode layer, and the third light absorbing layer is located between the third transparent substrate and the third lower electrode layer.

In some embodiments, the first cholesteric liquid crystal layer includes a first levo-cholesteric liquid crystal layer and a first d-cholesteric liquid crystal layer, the first levo-cholesteric liquid crystal layer and the second cholesteric liquid crystal layer One of a D-cholesteric liquid crystal layer is close to the first substrate, the other is close to the second transparent substrate, and a fifth transparent layer is included between the first L-cholesteric liquid crystal layer and the first D-cholesteric liquid crystal layer. substrate, the upper surface and the lower surface of the fifth transparent substrate are respectively attached with a fourth upper electrode layer and a fourth lower electrode layer; the second cholesteric liquid crystal layer includes a second L-cholesteric liquid crystal layer and a second D-cholesteric liquid crystal layer Liquid crystal layer, one of the second L-cholesteric liquid crystal layer and the second D-cholesteric liquid crystal layer is close to the second transparent substrate, the other is close to the third transparent substrate, and between the second L-cholesteric liquid crystal layer and the A sixth transparent substrate is included between the second D-cholesteric liquid crystal layer, and a fifth upper electrode layer and a fifth lower electrode layer are respectively attached to the upper surface and the lower surface of the sixth transparent substrate; the third cholesteric liquid crystal layer includes A third L-cholesteric liquid crystal layer and a third D-cholesteric liquid crystal layer, one of the third L-cholesteric liquid crystal layer and the third D-cholesteric liquid crystal layer is close to the third transparent substrate, and the other is close to the fourth A transparent substrate, including a seventh transparent substrate between the third L-cholesteric liquid crystal layer and the third D-cholesteric liquid crystal layer, the upper surface and the lower surface of the seventh transparent substrate are respectively attached with a sixth upper electrode layer and - A sixth lower electrode layer.

In some embodiments, the first light absorbing layer is made of black material.

In some embodiments, colors of the first color light, the second color light and the third color light are selected from the group consisting of red, blue and green, and the first color light, the third color light The second color light is different from the third color light.

In some embodiments, the first substrate, the second transparent substrate, the third transparent substrate and the fourth transparent substrate are rigid substrates or flexible substrates.

In order to achieve at least one of the above advantages or other advantages, another embodiment of the present invention further provides a method for manufacturing a cholesteric liquid crystal display device. This cholesteric liquid crystal display The manufacturing method of the device includes the following steps: providing a first substrate, a second transparent substrate, a third transparent substrate, and a fourth transparent substrate, forming a first light-absorbing layer on the lower side of the first substrate, and A second light-absorbing layer is formed on one side of the second transparent substrate, a third light-absorbing layer is formed on one side of the third transparent substrate; a first lower electrode layer is formed on the upper side of the first substrate, and a first lower electrode layer is formed on the second transparent substrate. A first upper electrode layer and a second lower electrode layer are respectively formed on the lower side and the upper side of the substrate, and a second upper electrode layer and a third lower electrode layer are respectively formed on the lower side and the upper side of the third transparent substrate. A third upper electrode layer is formed on the lower side of the fourth transparent substrate; a first cholesteric liquid crystal layer is added to the first lower electrode layer and the first upper electrode layer, and a second cholesteric liquid crystal layer is added to the second In the lower electrode layer and the second upper electrode layer, a third cholesteric liquid crystal layer is added to the third lower electrode layer and the third upper electrode layer, wherein the first cholesteric liquid crystal layer is used to generate a first The first color light in the wavelength range, the second cholesteric liquid crystal layer is used to generate the second color light with a second wavelength range, the third cholesteric liquid crystal layer is used to generate the third color light with a third wavelength range, the first The second light-absorbing layer is used to absorb light in the second wavelength range, and the third light-absorbing layer is used to absorb light in the third wavelength range.

Therefore, using a cholesteric liquid crystal display device and its manufacturing method provided by the present invention, the operation of adding a cholesteric liquid crystal layer between two adjacent substrates to produce a cholesteric liquid crystal display device is carried out by first processing each substrate on both sides. , can reduce the overall thickness of the cholesteric liquid crystal display device, save installation space, and the overall manufacturing process is simple and convenient.

The above description is only an overview of the technical solution of this creation. In order to better understand the technical means of this creation, it can be implemented according to the contents of the specification, and in order to make the above and other purposes, features and advantages of this creation more obvious and easy to understand , the preferred embodiments are specifically cited below, together with the drawings, and detailed descriptions are as follows.

10, 20, 30, 40, 50: cholesteric liquid crystal display device

110: the first substrate

120: the second transparent substrate

130: the third transparent substrate

140: the fourth transparent substrate

150: the fifth transparent substrate

160: The sixth transparent substrate

170: The seventh transparent substrate

210: the first cholesteric liquid crystal layer

211: the first L-cholesteric liquid crystal layer

212: the first D-cholesteric liquid crystal layer

220: second cholesteric liquid crystal layer

221: the second L-cholesteric liquid crystal layer

222: the second D-cholesteric liquid crystal layer

230: the third cholesteric liquid crystal layer

231: the third L-cholesteric liquid crystal layer

232: the third D-cholesteric liquid crystal layer

310: the first upper electrode layer

315: the first lower electrode layer

320: the second upper electrode layer

325: the second lower electrode layer

330: the third upper electrode layer

335: the third lower electrode layer

340: the fourth upper electrode layer

345: the fourth lower electrode layer

350: the fifth upper electrode layer

355: the fifth lower electrode layer

360: the sixth upper electrode layer

365: the sixth lower electrode layer

410: the first light absorbing layer

420: Second light absorbing layer

430: The third light-absorbing layer

The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation of the present application, and explain the principle of the present application together with the text description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative efforts. In the schema:

[FIG. 1A] is a schematic sectional view of the first embodiment of the cholesteric liquid crystal display device of the present invention.

[FIG. 1B] is a schematic cross-sectional view of a second embodiment of the cholesteric liquid crystal display device of the present invention.

[FIG. 1C] is a schematic sectional view of a third embodiment of the cholesteric liquid crystal display device of the present invention.

[FIG. 1D] is a schematic sectional view of a fourth embodiment of the cholesteric liquid crystal display device of the present invention.

[Fig. 2] is a schematic sectional view of a fifth embodiment of the cholesteric liquid crystal display device of the present invention.

[ Fig. 3 ] is a schematic flow chart for manufacturing a cholesteric liquid crystal display device according to the present invention.

Specific structural and functional details disclosed herein are representative only and for purposes of describing example embodiments of the present invention. This invention may, however, be embodied in many alternative forms and should not be construed as limited to only the embodiments set forth herein.

In describing the present invention, it is to be understood that the terms "central", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or components must have a particular orientation, be constructed and operate in a particular orientation and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used for descriptive purposes should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. Additionally, the term "comprise" and any variations thereof, are intended to cover a non-exclusive inclusion.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "an" are intended to include the plural unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and/or "comprising" as used herein specify the presence of stated features, integers, steps, operations, units and/or components, but do not exclude the presence or addition of one or more Other features, integers, steps, operations, units, components and/or combinations thereof.

Please refer to FIG. 1A . FIG. 1A is a schematic cross-sectional view of a first embodiment of a cholesteric liquid crystal display device 10 of the present invention. In order to achieve at least one of the above advantages or other advantages, the first embodiment of the present invention provides a cholesteric liquid crystal display device 10 . As shown in FIG. 1A , the cholesteric liquid crystal display device 10 includes a first substrate 110 , a second transparent substrate 120 , a third transparent substrate 130 and a fourth transparent substrate 140 . These substrates may be rigid substrates such as glass substrates or polyamide methacrylate substrate. Alternatively, it can also be a flexible substrate, such as a substrate made of polyimide or polyethylene terephthalate as its main component. In addition to the materials listed above, the first substrate 110 , the second transparent substrate 120 , the third transparent substrate 130 and the fourth transparent substrate 140 may also be rigid substrates or flexible substrates made of other materials.

The first cholesteric liquid crystal layer 210 is sandwiched between the first substrate 110 and the second transparent substrate 120 , and is used for generating a first color light having a first wavelength range. The second cholesteric liquid crystal layer 220 is sandwiched between the second transparent substrate 120 and the third transparent substrate 130 , and is used for generating a second color light having a second wavelength range. The third cholesteric liquid crystal layer 230 is sandwiched between the third transparent substrate 130 and the fourth transparent substrate 140 , and is used for generating a third color light having a third wavelength range. For example, the first cholesteric liquid crystal layer 210 generates red color light, the second cholesteric liquid crystal layer 220 generates green color light, and the third cholesteric liquid crystal layer 230 generates blue color light. The first wavelength range corresponding to the red color light is 590nm to 740nm, the second wavelength range corresponding to the green color light is 500nm to 590nm, and the third wavelength range corresponding to the blue color light is 415nm to 500nm. However, this case is not limited to this. In other embodiments, the first cholesteric liquid crystal layer 210 can also generate green or blue color light, the second cholesteric liquid crystal layer 220 can also generate red or blue color light, and the third cholesteric liquid crystal layer 230 can also generate red or blue color light. Green shade.

The first lower electrode layer 315 is disposed on a side of the first substrate 110 close to the first cholesteric liquid crystal layer 210 , and the first upper electrode layer 310 is disposed on a side of the second transparent substrate 120 close to the first cholesteric liquid crystal layer 210 . The first lower electrode layer 315 and the first upper electrode layer 310 are used to apply a voltage to the first cholesteric liquid crystal layer 210 to change the alignment state of its cholesteric liquid crystal molecules, so that the first cholesteric liquid crystal layer 210 produces the first color light, that is, from The first color light is reflected from the incident light.

The second lower electrode layer 325 is disposed on the second transparent substrate 120 close to the second capacitor. One side of the alcohol liquid crystal layer 220 . The second upper electrode layer 320 is disposed on a side of the third transparent substrate 130 close to the second cholesteric liquid crystal layer 220 . The second lower electrode layer 325 and the second upper electrode layer 320 are used to apply a voltage to the second cholesteric liquid crystal layer 220 to change the alignment state of its cholesteric liquid crystal molecules, so that the second cholesteric liquid crystal layer 220 generates the second color light, that is, from the incident The second color light is reflected in the light.

The third lower electrode layer 335 is disposed on a side of the third transparent substrate 130 close to the third cholesteric liquid crystal layer 230 . The third upper electrode layer 330 is disposed on a side of the fourth transparent substrate 140 close to the third cholesteric liquid crystal layer 230 . The third lower electrode layer 335 and the third upper electrode layer 330 are used to apply a voltage to the third cholesteric liquid crystal layer 230 to change the alignment state of its cholesteric liquid crystal molecules, so that the third cholesteric liquid crystal layer 230 generates a third color light, that is, from the incident The third color light is reflected in the light.

The first light-absorbing layer 410 is located under the first substrate 110 and is used for absorbing light so that the cholesteric liquid crystal display device 10 can appear black. In one embodiment, the first light absorbing layer 410 is made of black material to absorb visible light.

The second light-absorbing layer 420 is located between the second transparent substrate 120 and the second lower electrode layer 325, and is used to absorb light in the second wavelength range, so as to prevent the second color light in the incident light from passing through the second transparent substrate 120 and further entering the first A cholesteric liquid crystal layer 210 is used to improve the display performance of the cholesteric liquid crystal display device 10 .

The third light-absorbing layer 430 is located between the third transparent substrate 130 and the third lower electrode layer 335, and is used to absorb light in the third wavelength range, so as to prevent the third color light in the incident light from passing through the third transparent substrate 130 and further entering the first light-absorbing layer 430. Two cholesteric liquid crystal layers 220 are used to improve the display performance of the cholesteric liquid crystal display device 10 .

To further illustrate, the cholesteric liquid crystal display device 10 can realize a full-color display effect through the arrangement and combination of the first color light, the second color light, and the third color light generated. the above The first lower electrode layer 315, the first upper electrode layer 310, the second lower electrode layer 325, the second upper electrode layer 320, the third lower electrode layer 335, and the third upper electrode layer 330 can be made of transparent conductive materials, For example, tin-doped indium oxide (Indium Tin Oxide, ITO). In addition, although the first lower electrode layer 315, the first upper electrode layer 310, the second lower electrode layer 325, the second upper electrode layer 320, the third lower electrode layer 335, and the third upper electrode layer 330 are disposed on each substrate on both sides, but it is not limited that it must be in contact with the substrate.

Please refer to FIG. 1B . FIG. 1B is a schematic cross-sectional view of a second embodiment of a cholesteric liquid crystal display device 20 of the present invention. In order to achieve at least one of the above advantages or other advantages, the second embodiment of the present invention provides a cholesteric liquid crystal display device 20 . As shown in FIG. 1B , the cholesteric liquid crystal display device 20 includes a first substrate 110 , a second transparent substrate 120 , a third transparent substrate 130 and a fourth transparent substrate 140 .

The first cholesteric liquid crystal layer 210 is sandwiched between the first substrate 110 and the second transparent substrate 120 , and is used for generating a first color light having a first wavelength range. The second cholesteric liquid crystal layer 220 is sandwiched between the second transparent substrate 120 and the third transparent substrate 130 , and is used for generating a second color light having a second wavelength range. The third cholesteric liquid crystal layer 230 is sandwiched between the third transparent substrate 130 and the fourth transparent substrate 140 , and is used for generating a third color light having a third wavelength range. For example, the first cholesteric liquid crystal layer 210 generates red color light, the second cholesteric liquid crystal layer 220 generates green color light, and the third cholesteric liquid crystal layer 230 generates blue color light.

The first lower electrode layer 315 is disposed on a side of the first substrate 110 close to the first cholesteric liquid crystal layer 210 , and the first upper electrode layer 310 is disposed on a side of the second transparent substrate 120 close to the first cholesteric liquid crystal layer 210 . The first lower electrode layer 315 and the first upper electrode layer 310 are used to apply a voltage to the first cholesteric liquid crystal layer 210 to change the alignment state of its cholesteric liquid crystal molecules, so that the first cholesteric liquid crystal layer The alcohol liquid crystal layer 210 generates the first color light, that is, reflects the first color light from the incident light.

The second lower electrode layer 325 is disposed on a side of the second transparent substrate 120 close to the second cholesteric liquid crystal layer 220 . The second upper electrode layer 320 is disposed on a side of the third transparent substrate 130 close to the second cholesteric liquid crystal layer 220 . The second lower electrode layer 325 and the second upper electrode layer 320 are used to apply a voltage to the second cholesteric liquid crystal layer 220 to change the alignment state of its cholesteric liquid crystal molecules, so that the second cholesteric liquid crystal layer 220 generates the second color light, that is, from the incident The second color light is reflected in the light.

The third lower electrode layer 335 is disposed on a side of the third transparent substrate 130 close to the third cholesteric liquid crystal layer 230 . The third upper electrode layer 330 is disposed on a side of the fourth transparent substrate 140 close to the third cholesteric liquid crystal layer 230 . The third lower electrode layer 335 and the third upper electrode layer 330 are used to apply a voltage to the third cholesteric liquid crystal layer 230 to change the alignment state of its cholesteric liquid crystal molecules, so that the third cholesteric liquid crystal layer 230 generates a third color light, that is, from the incident The third color light is reflected in the light.

The first light-absorbing layer 410 is located under the first substrate 110 for absorbing light so that the cholesteric liquid crystal display device 20 can appear black. In one embodiment, the first light absorbing layer 410 is made of black material to absorb visible light.

The second light-absorbing layer 420 is located between the second transparent substrate 120 and the second lower electrode layer 325, and is used to absorb light in the second wavelength range, so as to prevent the second color light in the incident light from passing through the second transparent substrate 120 and further entering the first A cholesteric liquid crystal layer 210 is used to improve the display performance of the cholesteric liquid crystal display device 20 .

The third light-absorbing layer 430 is located between the third transparent substrate 130 and the second upper electrode layer 320, and is used for absorbing light in the third wavelength range, so as to prevent the third color light in the incident light from passing through the third transparent substrate 130 and further entering the first second electrode layer. Two cholesteric liquid crystal layers 220 are used to improve the display performance of the cholesteric liquid crystal display device 20 .

Please refer to FIG. 1C . FIG. 1C is a schematic cross-sectional view of a third embodiment of a cholesteric liquid crystal display device 30 of the present invention. In order to achieve at least one of the above advantages or other advantages, the third embodiment of the present invention provides a cholesteric liquid crystal display device 30 . As shown in FIG. 1C , the cholesteric liquid crystal display device 30 includes a first substrate 110 , a second transparent substrate 120 , a third transparent substrate 130 and a fourth transparent substrate 140 .

The first cholesteric liquid crystal layer 210 is sandwiched between the first substrate 110 and the second transparent substrate 120 , and is used for generating a first color light having a first wavelength range. The second cholesteric liquid crystal layer 220 is sandwiched between the second transparent substrate 120 and the third transparent substrate 130 , and is used for generating a second color light having a second wavelength range. The third cholesteric liquid crystal layer 230 is sandwiched between the third transparent substrate 130 and the fourth transparent substrate 140 , and is used for generating a third color light having a third wavelength range. For example, the first cholesteric liquid crystal layer 210 generates red color light, the second cholesteric liquid crystal layer 220 generates green color light, and the third cholesteric liquid crystal layer 230 generates blue color light.

The first lower electrode layer 315 is disposed on a side of the first substrate 110 close to the first cholesteric liquid crystal layer 210 , and the first upper electrode layer 310 is disposed on a side of the second transparent substrate 120 close to the first cholesteric liquid crystal layer 210 . The first lower electrode layer 315 and the first upper electrode layer 310 are used to apply a voltage to the first cholesteric liquid crystal layer 210 to change the alignment state of its cholesteric liquid crystal molecules, so that the first cholesteric liquid crystal layer 210 produces the first color light, that is, from The first color light is reflected from the incident light.

The second lower electrode layer 325 is disposed on a side of the second transparent substrate 120 close to the second cholesteric liquid crystal layer 220 . The second upper electrode layer 320 is disposed on a side of the third transparent substrate 130 close to the second cholesteric liquid crystal layer 220 . The second lower electrode layer 325 and the second upper electrode layer 320 are used to apply a voltage to the second cholesteric liquid crystal layer 220 to change the alignment state of its cholesteric liquid crystal molecules, so that the second cholesteric liquid crystal layer 220 generates the second color light, that is, from the incident The second color light is reflected in the light.

The third lower electrode layer 335 is disposed on a side of the third transparent substrate 130 close to the third cholesteric liquid crystal layer 230 . The third upper electrode layer 330 is disposed on a side of the fourth transparent substrate 140 close to the third cholesteric liquid crystal layer 230 . The third lower electrode layer 335 and the third upper electrode layer 330 are used to apply a voltage to the third cholesteric liquid crystal layer 230 to change the alignment state of its cholesteric liquid crystal molecules, so that the third cholesteric liquid crystal layer 230 generates a third color light, that is, from the incident The third color light is reflected in the light.

The first light-absorbing layer 410 is located under the first substrate 110 and is used for absorbing light so that the cholesteric liquid crystal display device 30 can appear black. In one embodiment, the first light absorbing layer 410 is made of black material to absorb visible light.

The second light absorbing layer 420 is located between the second transparent substrate 120 and the first upper electrode layer 310, and is used to absorb light in the second wavelength range, so as to prevent the second color light in the incident light from passing through the second transparent substrate 120 and further entering the first electrode layer 310. A cholesteric liquid crystal layer 210 is used to improve the display performance of the cholesteric liquid crystal display device 30 .

The third light-absorbing layer 430 is located between the third transparent substrate 130 and the second upper electrode layer 320, and is used for absorbing light in the third wavelength range, so as to prevent the third color light in the incident light from passing through the third transparent substrate 130 and further entering the first second electrode layer. Two cholesteric liquid crystal layers 220 are used to improve the display performance of the cholesteric liquid crystal display device 30 .

Please refer to FIG. 1D . FIG. 1D is a schematic cross-sectional view of a fourth embodiment of a cholesteric liquid crystal display device 40 of the present invention. In order to achieve at least one of the above advantages or other advantages, the fourth embodiment of the present invention provides a cholesteric liquid crystal display device 40 . As shown in FIG. 1D , the cholesteric liquid crystal display device 40 includes a first substrate 110 , a second transparent substrate 120 , a third transparent substrate 130 and a fourth transparent substrate 140 .

The first cholesteric liquid crystal layer 210 is sandwiched between the first substrate 110 and the second transparent substrate. between plates 120 for generating a first color light having a first wavelength range. The second cholesteric liquid crystal layer 220 is sandwiched between the second transparent substrate 120 and the third transparent substrate 130 , and is used for generating a second color light having a second wavelength range. The third cholesteric liquid crystal layer 230 is sandwiched between the third transparent substrate 130 and the fourth transparent substrate 140 , and is used for generating a third color light having a third wavelength range. For example, the first cholesteric liquid crystal layer 210 generates red color light, the second cholesteric liquid crystal layer 220 generates green color light, and the third cholesteric liquid crystal layer 230 generates blue color light.

The first lower electrode layer 315 is disposed on a side of the first substrate 110 close to the first cholesteric liquid crystal layer 210 , and the first upper electrode layer 310 is disposed on a side of the second transparent substrate 120 close to the first cholesteric liquid crystal layer 210 . The first lower electrode layer 315 and the first upper electrode layer 310 are used to apply a voltage to the first cholesteric liquid crystal layer 210 to change the alignment state of its cholesteric liquid crystal molecules, so that the first cholesteric liquid crystal layer 210 produces the first color light, that is, from The first color light is reflected from the incident light.

The second lower electrode layer 325 is disposed on a side of the second transparent substrate 120 close to the second cholesteric liquid crystal layer 220 . The second upper electrode layer 320 is disposed on a side of the third transparent substrate 130 close to the second cholesteric liquid crystal layer 220 . The second lower electrode layer 325 and the second upper electrode layer 320 are used to apply a voltage to the second cholesteric liquid crystal layer 220 to change the alignment state of its cholesteric liquid crystal molecules, so that the second cholesteric liquid crystal layer 220 generates the second color light, that is, from the incident The second color light is reflected in the light.

The third lower electrode layer 335 is disposed on a side of the third transparent substrate 130 close to the third cholesteric liquid crystal layer 230 . The third upper electrode layer 330 is disposed on a side of the fourth transparent substrate 140 close to the third cholesteric liquid crystal layer 230 . The third lower electrode layer 335 and the third upper electrode layer 330 are used to apply a voltage to the third cholesteric liquid crystal layer 230 to change the alignment state of its cholesteric liquid crystal molecules, so that the third cholesteric liquid crystal layer 230 generates a third color light, that is, from the incident The third color light is reflected in the light.

The first light absorbing layer 410 is located under the first substrate 110 for absorbing light, Furthermore, the cholesteric liquid crystal display device 40 can appear black. In one embodiment, the first light absorbing layer 410 is made of black material to absorb visible light.

The second light absorbing layer 420 is located between the second transparent substrate 120 and the first upper electrode layer 310, and is used to absorb light in the second wavelength range, so as to prevent the second color light in the incident light from passing through the second transparent substrate 120 and further entering the first electrode layer 310. A cholesteric liquid crystal layer 210 is used to improve the display performance of the cholesteric liquid crystal display device 40 .

The third light-absorbing layer 430 is located between the third transparent substrate 130 and the third lower electrode layer 335, and is used to absorb light in the third wavelength range, so as to prevent the third color light in the incident light from passing through the third transparent substrate 130 and further entering the first light-absorbing layer 430. Two cholesteric liquid crystal layers 220 are used to improve the display performance of the cholesteric liquid crystal display device 40 .

Please refer to FIG. 2 . FIG. 2 is a schematic cross-sectional view of a fifth embodiment of a cholesteric liquid crystal display device 50 of the present invention. In order to achieve at least one of the above advantages or other advantages, the fifth embodiment of the present invention provides a cholesteric liquid crystal display device 50 . As shown in FIG. 2, compared with the cholesteric liquid crystal display device 10 in FIG. 1A, the first cholesteric liquid crystal layer 210 includes a first left-handed cholesteric liquid crystal layer 211 and a first right-handed cholesteric liquid crystal layer 212 stacked up and down. The dicholesteric liquid crystal layer 220 includes a second L-cholesteric liquid crystal layer 221 and a second D-cholesteric liquid crystal layer 222 stacked up and down, and the third cholesteric liquid crystal layer 230 includes a third L-cholesteric liquid crystal layer 231 and a third D-cholesteric liquid crystal layer stacked up and down. Layer 232. However, this case is not limited to this. In other embodiments, the first D-cholesteric liquid crystal layer 212 can also be located above the first L-cholesteric liquid crystal layer 211, the second D-cholesteric liquid crystal layer 222 can also be located above the second L-cholesteric liquid crystal layer 221, and the third The D-cholesteric liquid crystal layer 232 can also be located above the third L-cholesteric liquid crystal layer 231 . The first L-cholesteric liquid crystal layer 211 and the first D-cholesteric liquid crystal layer 212 may also be arranged side by side on the same layer, and the second L-cholesteric liquid crystal layer The alcohol liquid crystal layer 221 and the second D-cholesteric liquid crystal layer 222 can also be arranged side by side on the same layer, and the third L-cholesteric liquid crystal layer 231 and the third D-cholesteric liquid crystal layer 232 can also be arranged side by side on the same layer.

A fifth transparent substrate 150 is included between the first L-cholesteric liquid crystal layer 211 and the first D-cholesteric liquid crystal layer 212, and the upper surface and the lower surface of the fifth transparent substrate 150 are respectively attached with a fourth upper electrode layer 340 and a fourth lower electrode layer. 345. The first lower electrode layer 315 and the fourth lower electrode layer 345 are used to apply a voltage to the first D-cholesteric liquid crystal layer 212 to make the first D-cholesteric liquid crystal layer 212 generate the first D-colored light. The first upper electrode layer 310 and the fourth upper electrode layer 340 are used to apply a voltage to the first L-cholesteric liquid crystal layer 211 , so that the first L-cholesteric liquid crystal layer 211 generates the first left-handed color light. The first right-handed color light is the same color as the first left-handed color light.

A sixth transparent substrate 160 is included between the second L-cholesteric liquid crystal layer 221 and the second D-cholesteric liquid crystal layer 222, and the upper surface and the lower surface of the sixth transparent substrate 160 are respectively attached with the fifth upper electrode layer 350 and the fifth lower electrode layer. 355. The second lower electrode layer 325 and the fifth lower electrode layer 355 are used to apply voltage to the second dextro-cholesteric liquid crystal layer 222 , so that the second dextro-cholesteric liquid crystal layer 222 generates the second dextro-chromatic light. The second upper electrode layer 320 and the fifth upper electrode layer 350 are used to apply a voltage to the second L-cholesteric liquid crystal layer 221 , so that the second L-cholesteric liquid crystal layer 221 generates the second left-handed color light. The second right-handed color light is the same color as the second left-handed color light.

A seventh transparent substrate 170 is included between the third L-cholesteric liquid crystal layer 231 and the third D-cholesteric liquid crystal layer 232, and the upper surface and the lower surface of the seventh transparent substrate 170 are respectively attached with the sixth upper electrode layer 360 and the sixth lower electrode layer. 365. The third lower electrode layer 335 and the sixth lower electrode layer 365 are used to apply a voltage to the third dextro-cholesteric liquid crystal layer 232 so that the third dextro-cholesteric liquid crystal layer 232 generates a third dextro-chromatic light. The third upper electrode layer 330 and the sixth upper electrode layer 360 are used to A voltage is applied to the three L-cholesteric liquid crystal layers 231 , so that the third L-cholesteric liquid crystal layer 231 generates a third L-cholesteric color light. The third right-handed color light is the same color as the third left-handed color light.

To further illustrate, the display capability of the cholesteric liquid crystal display device 50 can be further improved by combining the left-handed and right-handed colored lights generated above. The fifth transparent substrate 150 , the sixth transparent substrate 160 and the seventh transparent substrate 170 may be rigid substrates or flexible substrates. The fourth upper electrode layer 340, the fourth lower electrode layer 345, the fifth upper electrode layer 350, the fifth lower electrode layer 355, the sixth upper electrode layer 360, and the sixth lower electrode layer 365 can be made of transparent conductive materials For example, tin-doped indium oxide (Indium Tin Oxide, ITO). In addition, although the fourth upper electrode layer 340, the fourth lower electrode layer 345, the fifth upper electrode layer 350, the fifth lower electrode layer 355, the sixth upper electrode layer 360, and the sixth lower electrode layer 365 are disposed on each substrate on both sides, but it is not limited that it must be in contact with the substrate.

It should be added that the positions of the second light-absorbing layer 420 and the third light-absorbing layer 430 are not limited to the areas shown in FIG. The positions of the three light-absorbing layers 430 are adjusted according to the actual needs of the second light-absorbing layer 420 and the third light-absorbing layer 430 in FIG. 2 .

Please refer to FIG. 3 in conjunction with FIG. 1A . FIG. 3 is a schematic flow chart of manufacturing a cholesteric liquid crystal display device according to the present invention. In order to achieve at least one of the above advantages or other advantages, the sixth embodiment of the present invention provides a method for manufacturing a cholesteric liquid crystal display device 10 . As shown in the figure, the manufacturing method of the cholesteric liquid crystal display device 10 includes the following steps:

S1: Provide the first substrate, the second transparent substrate, the third transparent substrate, and the fourth transparent substrate, and process the light-absorbing layer on the first substrate, the second transparent substrate, and the third transparent substrate;

S2: for the first substrate, the second transparent substrate, the third transparent substrate, the fourth transparent substrate The bright substrate is then processed for the electrode layer;

S3: add the first cholesteric liquid crystal layer to the first lower electrode layer and the first upper electrode layer, add the second cholesteric liquid crystal layer to the second lower electrode layer and the second upper electrode layer, add the third cholesteric liquid crystal layer to the second electrode layer Three lower electrode layers and a third upper electrode layer.

To further illustrate, the light-absorbing layer processing operation in step S1 refers to forming the first light-absorbing layer 410 on the lower side of the first substrate 110, forming the second light-absorbing layer 420 on one side of the second transparent substrate 120, and forming the second light-absorbing layer 420 on the third transparent substrate 130. The third light absorbing layer 430 is formed on one side. 1A to 1D, the second light absorbing layer 420 can be selectively formed on the upper side or the lower side of the second transparent substrate 120, and the third light absorbing layer 430 can be selectively formed on the upper side or the third transparent substrate 130 or The lower side to meet the needs of each process. The light-absorbing layer can be formed on the substrate by coating or pasting with a color photoresist material or a film-like light-filtering material. The light-absorbing layer can be manufactured according to the CF (Color Filter) manufacturing process, using spin, spray, slit or the combination of the three. In addition, other conventional means can also be used to form the light absorbing layer.

The electrode layer processing operation in step S2 refers to forming the first lower electrode layer 315 on the upper side of the first substrate 110, and forming the first upper electrode layer 310 and the second lower electrode layer on the lower side and the upper side of the second transparent substrate 120, respectively. 325 , forming the second upper electrode layer 320 and the third lower electrode layer 335 on the lower side and the upper side of the third transparent substrate 130 respectively, and forming the third upper electrode layer 330 on the lower side of the fourth transparent substrate 140 . The electrode layer can be achieved by coating, lithography, etching, etc., wherein the coating can be sputtering, electroplating, electroless plating, vapor deposition, chemical vapor deposition, coating, etc.

The first cholesteric liquid crystal layer 210 in step S3 is used to generate the first color light with the first wavelength range, the second cholesteric liquid crystal layer 220 is used to generate the second color light with the second wavelength range, and the third cholesteric liquid crystal layer 230 is used for for generating a third color light having a third wavelength range. in, The second light absorbing layer 420 can be used to absorb light in the second wavelength range. The third light-absorbing layer 430 can be used to absorb light in a third wavelength range. The method of adding the cholesteric liquid crystal layer can use ODF (One Drop Fill) or traditional vacuum injection.

To sum up, using the cholesteric liquid crystal display device 10 and its manufacturing method provided by the present invention, compared with the existing cholesteric liquid crystal display and its manufacturing process, by first processing each substrate on both sides to form a light-absorbing layer and the electrode layer, then add a cholesteric liquid crystal layer between two adjacent substrates to make the cholesteric liquid crystal display device 10, which can reduce the overall thickness of the cholesteric liquid crystal display device 10, save the installation space, and make the cholesteric liquid crystal display device 10 as a whole. The manufacturing process of the liquid crystal display device 10 is more concise, convenient and highly efficient.

Through the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the claimed patent scope of the present invention.

10: Cholesterol liquid crystal display device

110: the first substrate

120: the second transparent substrate

130: the third transparent substrate

140: the fourth transparent substrate

210: the first cholesteric liquid crystal layer

220: second cholesteric liquid crystal layer

230: the third cholesteric liquid crystal layer

310: the first upper electrode layer

315: the first lower electrode layer

320: the second upper electrode layer

325: the second lower electrode layer

330: the third upper electrode layer

335: the third lower electrode layer

410: the first light absorbing layer

420: Second light absorbing layer

430: The third light-absorbing layer

Claims (10)

A cholesteric liquid crystal display device, comprising: a first substrate; a second transparent substrate; a third transparent substrate; a fourth transparent substrate; a first cholesteric liquid crystal layer sandwiched between the first substrate and the second transparent substrate Between the substrates, and used to generate a first color light, the first color light has a first wavelength range; a second cholesteric liquid crystal layer, sandwiched between the second transparent substrate and the third transparent substrate, and used to generate a second color light, the second color light has a second wavelength range; a third cholesteric liquid crystal layer, sandwiched between the third transparent substrate and the fourth transparent substrate, and used to generate a first color light Three-color light, the third color light has a third wavelength range; a first light-absorbing layer is arranged on the side of the first substrate away from the first cholesteric liquid crystal layer for absorbing light; a second light-absorbing layer is arranged on the side of the first cholesteric liquid crystal layer One side of the second transparent substrate is used to absorb light in the second wavelength range; a third light-absorbing layer is arranged on one side of the third transparent substrate and is used to absorb light in the third wavelength range; The lower electrode layer is arranged on the side of the first substrate close to the first cholesteric liquid crystal layer; a first upper electrode layer is arranged on the side of the second transparent substrate close to the first cholesteric liquid crystal layer; a second a lower electrode layer disposed on a side of the second transparent substrate close to the second cholesteric liquid crystal layer; A second upper electrode layer disposed on the third transparent substrate close to the second cholesteric liquid crystal layer; a third lower electrode layer disposed on the third transparent substrate close to the third cholesteric liquid crystal layer; and a third upper electrode layer disposed on a side of the fourth transparent substrate close to the third cholesteric liquid crystal layer. The cholesteric liquid crystal display device according to claim 1, wherein the second light-absorbing layer is located between the second transparent substrate and the second lower electrode layer, and the third light-absorbing layer is located between the third transparent substrate and the third between the lower electrode layers. The cholesteric liquid crystal display device according to claim 1, wherein the second light-absorbing layer is located between the second transparent substrate and the second lower electrode layer, and the third light-absorbing layer is located between the third transparent substrate and the second between the upper electrode layers. The cholesteric liquid crystal display device according to claim 1, wherein the second light-absorbing layer is located between the second transparent substrate and the first upper electrode layer, and the third light-absorbing layer is located between the third transparent substrate and the second between the upper electrode layers. The cholesteric liquid crystal display device according to claim 1, wherein the second light-absorbing layer is located between the second transparent substrate and the first upper electrode layer, and the third light-absorbing layer is located between the third transparent substrate and the third between the lower electrode layers. The cholesteric liquid crystal display device according to claim 1, wherein the first cholesteric liquid crystal layer includes a first levo-cholesteric liquid crystal layer and a first right-handed cholesteric liquid crystal layer, and the first levo-cholesteric liquid crystal layer and the first right-handed cholesteric liquid crystal layer One of the cholesteric liquid crystal layers is close to the first substrate, the other is close to the second transparent substrate, and a fifth transparent substrate is included between the first cholesteric liquid crystal layer and the first cholesteric liquid crystal layer, The upper surface and the lower surface of the fifth transparent substrate A fourth upper electrode layer and a fourth lower electrode layer are respectively attached; the second cholesteric liquid crystal layer includes a second L-cholesteric liquid crystal layer and a second D-cholesteric liquid crystal layer, and the second L-cholesteric liquid crystal layer and the first One of the two D-cholesteric liquid crystal layers is close to the second transparent substrate, the other is close to the third transparent substrate, and a sixth layer is included between the second L-cholesteric liquid crystal layer and the second D-cholesteric liquid crystal layer. A transparent substrate, the upper surface and the lower surface of the sixth transparent substrate are respectively attached with a fifth upper electrode layer and a fifth lower electrode layer; the third cholesteric liquid crystal layer includes a third left-handed cholesteric liquid crystal layer and a third right-handed A cholesteric liquid crystal layer, one of the third L-cholesteric liquid crystal layer and the third D-cholesteric liquid crystal layer is close to the third transparent substrate, the other is close to the fourth transparent substrate, and between the third L-cholesteric liquid crystal layer and the third D-cholesteric liquid crystal layer A seventh transparent substrate is included between the third D-cholesteric liquid crystal layer, and a sixth upper electrode layer and a sixth lower electrode layer are respectively attached to the upper surface and the lower surface of the seventh transparent substrate. The cholesteric liquid crystal display device according to claim 1, wherein the first light-absorbing layer is made of black material. The cholesteric liquid crystal display device according to claim 1, wherein the colors of the first color light, the second color light and the third color light are selected from the group consisting of red, blue and green, respectively, And the colors of the first color light, the second color light and the third color light are all different. The cholesteric liquid crystal display device according to claim 1, wherein the first substrate, the second transparent substrate, the third transparent substrate and the fourth transparent substrate are rigid substrates or flexible substrates. A method for manufacturing a cholesteric liquid crystal display device, comprising: providing a first substrate, a second transparent substrate, a third transparent substrate, and a fourth transparent substrate, and forming a first light-absorbing layer on the lower side of the first substrate , forming a second light-absorbing layer on one side of the second transparent substrate, and forming a third light-absorbing layer on one side of the third transparent substrate; A first lower electrode layer is formed on the upper side of the first substrate, a first upper electrode layer and a second lower electrode layer are respectively formed on the lower side and the upper side of the second transparent substrate, and a lower electrode layer is formed on the lower side of the third transparent substrate. A second upper electrode layer and a third lower electrode layer are formed on the side and the upper side respectively, and a third upper electrode layer is formed on the lower side of the fourth transparent substrate; a first cholesteric liquid crystal layer is added to the first lower electrode layer and the first upper electrode layer, adding a second cholesteric liquid crystal layer to the second lower electrode layer and the second upper electrode layer, adding a third cholesteric liquid crystal layer to the third lower electrode layer and the third In the upper electrode layer, the first cholesteric liquid crystal layer is used to generate a first color light with a first wavelength range, the second cholesteric liquid crystal layer is used to generate a second color light with a second wavelength range, and the first cholesteric liquid crystal layer is used to generate a second color light with a second wavelength range. The tri-cholesterol liquid crystal layer is used for generating a third color light with a third wavelength range, the second light-absorbing layer is used for absorbing the light of the second wavelength range, and the third light-absorbing layer is used for absorbing the light of the third wavelength range.

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