Double-layer cholesterol liquid crystal display and manufacturing method thereof

Abstract

The invention relates to a double-layer cholesterol liquid crystal display and a manufacturing method thereof. The double-layer cholesterol liquid crystal display comprises three transparent substrates, two opposite electrode layers, two cholesterol liquid crystal layers and a first light absorption layer, the double-layer cholesterol liquid crystal display further comprises two driving ICs and a second light absorption layer, and the two driving ICs can be arranged on the same side or different sides of a non-display area in the double-layer cholesterol liquid crystal display. In addition, the first cholesteric liquid crystal layer has first colored light, the second cholesteric liquid crystal layer has second colored light, the two colored light are selected from mutually opposite colors, and the two cholesteric liquid crystal layers have mutually opposite optical rotation, so that the double-layer cholesteric liquid crystal display with thinner thickness and lighter weight can be produced. And the contrast degree and the reflectivity can be improved, so that the overall display effect is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of a double-layer cholesterol liquid crystal display and a manufacturing method thereof, and in particular to a double-layer cholesterol liquid crystal display and a manufacturing method thereof which is thinner in overall thickness, lighter in weight, and does not require full color or high resolution. Background Art

[0002] Cholesteric Liquid Crystal Display (Ch-LCD) has a bistable characteristic, namely, two stable states, namely, a focal conic state and a planar state. When a voltage is applied, the arrangement state of the cholesteric liquid crystal molecules can be controlled to switch between the focal conic state and the planar state.

[0003] When the cholesterol liquid crystal is in a planar arrangement state, it will reflect light of a specific wavelength. On the contrary, when the cholesterol liquid crystal is in a focal conic arrangement state, light will penetrate through it. Therefore, the voltage applied to the cholesterol liquid crystal can be used to control whether the cholesterol liquid crystal is penetrated by light or reflects light of a specific wavelength. That is, the user can still keep the displayed content without consuming power. It is often used in temperature sensor displays, e-books, e-paper, electronic whiteboards and other products.

[0004] However, currently, various electronic labels, as well as applications such as bus and hospital stop signs, do not require full-color or high-resolution designs. For example, electronic labels in stores only need yellow, white, and black to display product prices and names, or bus stop signs that can only display red, white, and black. Because most of them have simple color distributions, using traditional three-layer cholesterol LCD displays will not only increase costs, but also make the production process more complicated.

[0005] The prior art patent number TWI773320 discloses a design of four transparent substrates, three cholesterol liquid crystals, and three colors. However, cholesterol liquid crystals have the characteristic of reflecting a single optical rotation. Therefore, the first and third layers of the prior art design will have the same polarization optical rotation. Because the first cholesterol liquid crystal layer and the third cholesterol liquid crystal layer have the same polarization and optical rotation, the cholesterol liquid crystal layers will affect each other's reflectivity, resulting in incomplete color rendering effects. Therefore, the more light the first cholesterol liquid crystal layer reflects, the less light the third cholesterol liquid crystal layer can reflect. The reflected light will interfere with each other and cause light leakage. In terms of the manufacturing process, because it is an OCA (Optically Clear Adhesive) optical adhesive process, a small piece needs to be combined and collaged during the process, and the operating cost is even higher.

[0006] Therefore, in order to improve the previous technology to reduce costs, produce products for simple color distribution, and make them have low cost but high color rendering performance and other characteristics of cholesterol liquid crystal display, it is necessary to develop an ideal technical method to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a double-layer cholesterol liquid crystal display and a manufacturing method thereof, so as to produce a display with a relatively thin overall thickness and light weight, such as an electronic label or a bus or hospital stop sign, which does not require full color or high resolution, and can reduce the production cost while having a high contrast and high reflectivity display effect.

[0008] The invention relates to a double-layer cholesterol liquid crystal display, wherein the double-layer cholesterol liquid crystal display comprises three transparent substrates, two relative electrode layers, two cholesterol liquid crystal layers, and a first light absorption layer.

[0009] The three transparent substrates include a first transparent substrate, a second transparent substrate, and a third transparent substrate stacked from bottom to top.

[0010] One of the two relative electrode layers includes a first upper electrode layer and a first lower electrode layer, and the other of the two relative electrode layers includes a second upper electrode layer and a second lower electrode layer, wherein the first lower electrode layer is arranged on the upper surface of the first transparent substrate, the first upper electrode layer is arranged on the lower surface of the second transparent substrate, the second lower electrode layer is arranged on the upper surface of the second transparent substrate, and the second upper electrode layer is arranged on the lower surface of the third transparent substrate.

[0011] The two cholesterol liquid crystal layers include a first cholesterol liquid crystal layer and a second cholesterol liquid crystal layer, and the two cholesterol liquid crystal layers have mutually opposite optical rotations, wherein the first cholesterol liquid crystal layer is arranged between the first upper electrode layer and the first lower electrode layer, and the second cholesterol liquid crystal layer is arranged between the second upper electrode layer and the second lower electrode layer.

[0012] The first light absorbing layer is disposed on the bottom surface of the first transparent substrate.

[0013] In one of the preferred embodiments, the double-layer cholesterol liquid crystal display further includes two driver ICs (Driver ICs), which are electrically coupled to the first lower electrode layer and the second lower electrode layer respectively, and the double-layer cholesterol liquid crystal display viewed from top to bottom has a display area in the middle and a non-display area around it, wherein the two driver ICs are respectively arranged in the non-display area and on the same side relative to the display area. In other words, the two driver ICs are arranged at the same side of the non-display area.

[0014] In one of the preferred embodiments, the double-layer cholesterol liquid crystal display further includes two driving ICs, which are electrically coupled to the first lower electrode layer and the second lower electrode layer respectively, and the double-layer cholesterol liquid crystal display viewed from top to bottom has a display area in the middle and a non-display area around it, wherein the two driving ICs are respectively arranged in the non-display area and on opposite sides of the display area. In other words, the two driving ICs are respectively arranged at positions on both sides of the non-display area.

[0015] In addition, in the double-layer cholesteric liquid crystal display, the first cholesteric liquid crystal layer has a first color light, and the second cholesteric liquid crystal layer has a second color light.

[0016] The double-layer cholesterol liquid crystal display further comprises a second light absorbing layer, wherein the second light absorbing layer is located between the first cholesterol liquid crystal layer and the second cholesterol liquid crystal layer, and the second light absorbing layer is used for absorbing the wavelength of the second color light.

[0017] Next, the second lower electrode layer can be made into a colored conductive film through a thin film optical design to absorb the wavelength of the second color light and serve as the second light absorbing layer. In other words, the second lower electrode layer can be the second light absorbing layer to absorb the wavelength of the second color light.

[0018] The first cholesterol liquid crystal layer has a first color light, and the second cholesterol liquid crystal layer has a second color light. The first color light and the second color light are contrasting colors. In this way, in addition to the first color light and the second color light, white light can be mixed. That is to say, because the first color light and the second color light are contrasting colors, white light can be mixed. For example, when the first color light and the second color light of the double-layer cholesterol liquid crystal display are respectively selected from blue light and yellow light, blue light, yellow light, and white light are present. Because of the first light-absorbing layer, the double-layer cholesterol liquid crystal display can display four colors of blue, yellow, white, and black at will.

[0019] Furthermore, the double-layer cholesterol liquid crystal display further includes four alignment films (PI), which are respectively arranged on the upper and lower sides of the two cholesterol liquid crystal layers to align the first cholesterol liquid crystal layer and the second cholesterol liquid crystal layer into the first color light and the second color light of mutually contrasting colors.

[0020] The double-layer cholesteric liquid crystal display further comprises a plurality of photo spacers (PS) disposed on upper and lower outer sides of the two cholesteric liquid crystal layers to respectively control the uniformity of the two cholesteric liquid crystal layers and fix the positions of the two cholesteric liquid crystal layers.

[0021] Furthermore, the present invention is also a method for manufacturing a double-layer cholesteric liquid crystal display, the method comprising the following steps:

[0022] A first lower electrode layer, a first upper electrode layer, and a second upper electrode layer are respectively manufactured on a first transparent substrate, a second transparent substrate, and a third transparent substrate.

[0023] Cholesteric liquid crystal is injected between the first transparent substrate and the second transparent substrate to form a first cholesteric liquid crystal layer.

[0024] The first transparent substrate and the second transparent substrate are thinned to reduce the overall thickness and achieve a lighter and thinner design.

[0025] A second lower electrode layer is formed on the second transparent substrate.

[0026] Cholesteric liquid crystal is injected between the second transparent substrate and the third transparent substrate to form a second cholesteric liquid crystal layer.

[0027] The third transparent substrate is thinned.

[0028] A first light absorbing layer is attached below the first transparent substrate.

[0029] Furthermore, before the step of injecting cholesteric liquid crystal, the manufacturing method further comprises the following steps:

[0030] A plurality of photoresist columns are respectively made below the first cholesterol liquid crystal layer and above the second cholesterol liquid crystal layer to respectively control the uniformity of the two cholesterol liquid crystal layers and fix their positions, and four alignment films are added. The four alignment films are respectively arranged on the upper and lower sides of the two cholesterol liquid crystal layers to align the first cholesterol liquid crystal layer and the second cholesterol liquid crystal layer into two contrasting colors.

[0031] Among them, the multiple photoresist columns are made of photosensitive resin material, and the spacers are made using a very mature lithography process (Photolithography). The spacers are made on a black matrix (Black Matrix, BM). In this way, the size and position of the spacers can be accurately controlled to prevent the spacers from moving. The four-alignment film can be made of polyimide (Polyimide), so that the cholesterol liquid crystal must be arranged in a specific direction to produce the desired optical effect. Through the above steps, the double-layer cholesterol liquid crystal display can achieve a better display effect.

[0032] The first cholesterol liquid crystal layer has a first color light, the second cholesterol liquid crystal layer has a second color light, the first color light and the second color light are the two contrasting colors, the double-layer cholesterol liquid crystal display further includes a second light absorbing layer, and the second light absorbing layer can use a color filter

[0033] The second light absorbing layer is located between the first cholesterol liquid crystal layer and the second cholesterol liquid crystal layer, and the second light absorbing layer is used to absorb the wavelength of the second color light.

[0034] Therefore, by using the double-layer cholesterol liquid crystal display and its manufacturing method provided by the present invention, the overall volume can be thinner and the weight can be lighter. In addition, the double-layer cholesterol liquid crystal display can reduce the process and improve the yield compared with the traditional three-layer cholesterol liquid crystal display. Because the two cholesterol liquid crystal layers have opposite optical rotations, the first color light and the second color light respectively possessed by the two cholesterol liquid crystal layers are the two contrasting colors, which can improve the contrast and reflectivity, thereby effectively improving the overall display effect.

[0035] Other features and beneficial effects of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other beneficial effects of the present invention can be achieved and obtained by the structures specifically pointed out in the description, claims, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The positional relationships described in the drawings in the following description are based on the directions in which the components are drawn in the diagrams, unless otherwise specified.

[0037] Figure 1 is a schematic diagram of a double-layer cholesteric liquid crystal display of the present invention;

[0038] Figure 2 Schematic diagram of reflectivity of contrasting colors with different optical rotations of the present invention;

[0039] Figure 3 is a schematic diagram of a first embodiment of the present invention;

[0040] Figure 4 is a schematic diagram of a second embodiment of the present invention;

[0041] Figure 5 is a schematic diagram of a third embodiment of the present invention;

[0042] Figure 6 is a schematic diagram of a detailed structural diagram of a double-layer cholesteric liquid crystal display of the present invention; and

[0043] Figure 7 The present invention is a flow chart of a method for manufacturing a double-layer cholesterol liquid crystal display.

[0044] Reference numerals:

[0045] 1: Double-layer cholesteric liquid crystal display

[0046] 2: Manufacturing method

[0047] 10: Transparent substrate

[0048] 12: First transparent substrate

[0049] 14: Second transparent substrate

[0050] 16: The third transparent substrate

[0051] 20: Opposite electrode layer

[0052] 22: First lower electrode layer

[0053] 24: First upper electrode layer

[0054] 26: Second upper electrode layer

[0055] 28: Second lower electrode layer

[0056] 30: Cholesteric Liquid Crystal Layer

[0057] 32: First Cholesteric Liquid Crystal Layer

[0058] 34: Second Cholesteric Liquid Crystal Layer

[0059] 42: The first light absorbing layer

[0060] 44: Second light absorbing layer

[0061] 52: First Color Light

[0062] 54: Second color light

[0063] 60: Driver IC

[0064] 70: Photoresist column

[0065] 80: Alignment film

[0066] A1: Display area

[0067] B1: Non-display area DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; the technical features designed in different implementation modes of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0069] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof all mean "at least including".

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] The present invention relates to a double-layer cholesterol liquid crystal display and a manufacturing method thereof. Figure 1 , Figure 1 Schematic diagram of a double-layer cholesteric liquid crystal display of the present invention. The double-layer cholesteric liquid crystal display 1 comprises three transparent substrates 10 , two opposing electrode layers 20 , two cholesteric liquid crystal layers 30 , and a first light absorption layer 42 .

[0072] The three transparent substrates 10 include a first transparent substrate 12 , a second transparent substrate 14 , and a third transparent substrate 16 stacked from bottom to top.

[0073] One of the two relative electrode layers 20 includes a first upper electrode layer 24 and a first lower electrode layer 22, and the other relative electrode layer 20 includes a second upper electrode layer 26 and a second lower electrode layer 28, wherein the first lower electrode layer 22 is arranged on the upper surface of the first transparent substrate 12, the first upper electrode layer 24 is arranged on the lower surface of the second transparent substrate 14, the second lower electrode layer 28 is arranged on the upper surface of the second transparent substrate 14, and the second upper electrode layer 26 is arranged on the lower surface of the third transparent substrate 16.

[0074] The two cholesterol liquid crystal layers 30 include a first cholesterol liquid crystal layer 32 and a second cholesterol liquid crystal layer 34. The two cholesterol liquid crystal layers 30 have opposite optical rotations, wherein the first cholesterol liquid crystal layer 32 is arranged between the first upper electrode layer 24 and the first lower electrode layer 22, and the second cholesterol liquid crystal layer 34 is arranged between the second upper electrode layer 26 and the second lower electrode layer 28.

[0075] The first light absorbing layer 42 is disposed on the bottom surface of the first transparent substrate 12 .

[0076] See also Figure 2 , Figure 2 Schematic diagram of reflectivity of contrasting colors with different optical rotations of the present invention. As mentioned above, the two cholesterol liquid crystal layers have opposite optical rotations, and the first cholesterol liquid crystal layer has a first color light 52, and the second cholesterol liquid crystal layer has a second color light 54, and the first color light 52 and the second color light 54 can be selected from mutually contrasting colors. As shown in the figure, the blue cholesterol liquid crystal layer is right-handed, and the yellow cholesterol liquid crystal layer is left-handed. The optical rotation of the cholesterol liquid crystal layer is related to the added substance, and can be divided into right-handed substance or left-handed substance. Because the optical rotations of the two layers are opposite, the reflectivity of the first cholesterol liquid crystal layer will not affect the reflectivity of the second cholesterol liquid crystal layer. The reflectivity of the crystal layer is improved to enhance the reflectivity of the screen display. In addition, the first cholesterol liquid crystal layer and the second cholesterol liquid crystal layer of the present invention can be the two cholesterol liquid crystal layers of different colors and different optical rotations, or the two cholesterol liquid crystal layers of the same color but different optical rotations. In the case of the two cholesterol liquid crystal layers 30 of the same color but different optical rotations, although only one color of light can be reflected, because both optical rotations are reflected, the reflectivity will be twice that of the single-layer cholesterol liquid crystal layer 30, that is, the cholesterol liquid crystal layers are all blue light, the first layer is right-handed light, and the second layer is left-handed light, and at this time, a better blue color will be displayed.

[0077] See also Figure 3 , Figure 3 1 is a schematic diagram of the first embodiment of the present invention. The double-layer cholesterol liquid crystal display 1 further includes two driver ICs 60 (Driver ICs), which are electrically coupled to the first lower electrode layer 22 and the second lower electrode layer 28, respectively. The double-layer cholesterol liquid crystal display 1 has a display area A1 in the middle and a non-display area B1 around it when viewed from top to bottom, wherein the two driver ICs 60 are respectively arranged on the same side of the non-display area B1 relative to the display area A1. In other words, the two driver ICs 60 are arranged on the same side of the non-display area B1.

[0078] As shown in the figure, looking from top to bottom from the user's perspective, the two driver ICs 60 are concentrated on the left side of the double-layer cholesterol liquid crystal display 1, and are staggered. In this way, the two driver ICs 60 are concentrated on a single side. When manufacturing the double-layer cholesterol liquid crystal display 1, the wiring design of the two driver ICs 60 is relatively simple, and only needs to be connected to the substrate from a single side. In addition, in addition to staggering the two driver ICs 60 on the left side of the double-layer cholesterol liquid crystal display 1, they can also be overlapped on the left, staggered on the right, or overlapped on the right.

[0079] See also Figure 4 , Figure 4 2 is a schematic diagram of a second embodiment of the present invention. The double-layer cholesterol liquid crystal display 1 further includes two driving ICs 60, which are electrically coupled to the first lower electrode layer 22 and the second lower electrode layer 28, respectively. The double-layer cholesterol liquid crystal display 1 has a display area A1 in the middle and a non-display area B1 around it when viewed from top to bottom, wherein the two driving ICs 60 are respectively disposed in the non-display area B1 and at two opposite sides of the display area A1. In other words, the two driving ICs 60 are respectively disposed at two sides of the non-display area B1.

[0080] Looking from top to bottom from the user's perspective, placing the two driving ICs 60 on the left and right sides of the double-layer cholesterol liquid crystal display 1 respectively can make the first transparent substrate 12, the second transparent substrate 14, the third transparent substrate 16, the first lower electrode layer 22, the first upper electrode layer 24, the second upper electrode layer 26, the second lower electrode layer 28, and the cholesterol liquid crystal layer 30 more concentrated in the middle. In this way, when the double-layer cholesterol liquid crystal display 1 is manufactured, the position of the screen display can be more centered, and during the manufacturing process, the circuit arrangement of the two driving ICs 60 can also be processed simultaneously.

[0081] See also Figure 5 , Figure 53 is a schematic diagram of a third embodiment of the present invention. The double-layer cholesteric liquid crystal display 1 further comprises a second light absorbing layer 44, the second light absorbing layer 44 is located between the first cholesteric liquid crystal layer 32 and the second cholesteric liquid crystal layer 34, and the second light absorbing layer 44 is used to absorb the wavelength of the second color light to increase the display performance of the double-layer cholesteric liquid crystal display 1.

[0082] Next, the second lower electrode layer 28 can be made into a colored conductive film through a thin film optical design to absorb the wavelength of the second color light and serve as the second light absorbing layer 44. In other words, the second lower electrode layer 28 can be the second light absorbing layer 44 to absorb the wavelength of the second color light.

[0083] See also Figure 6 , Figure 6 Schematic diagram of the detailed structure of the double-layer cholesterol liquid crystal display 1 of the present invention. Further, the double-layer cholesterol liquid crystal display 1 further comprises a plurality of light-blocking columns 70 and four alignment films 80, the four alignment films 80 are respectively arranged on the upper and lower sides of the two cholesterol liquid crystal layers to align the first cholesterol liquid crystal layer 32 and the second cholesterol liquid crystal layer 34 to the first color light and the second color light of mutually contrasting colors, and the light-blocking columns 70 are arranged on the upper and lower outer sides of the two cholesterol liquid crystal layers to respectively control the uniformity of the two cholesterol liquid crystal layers and fix the positions of the two cholesterol liquid crystal layers.

[0084] Furthermore, the present invention is also a method for manufacturing a double-layer cholesterol liquid crystal display 1, see Figure 7 , Figure 7 It is a flow chart of a manufacturing method 2 of a double-layer cholesteric liquid crystal display 1 of the present invention.

[0085] The manufacturing method 2 comprises the following steps:

[0086] Step S01 : forming a first lower electrode layer 22 , a first upper electrode layer 24 , and a second upper electrode layer 26 on a first transparent substrate 12 , a second transparent substrate 14 , and a third transparent substrate 16 , respectively.

[0087] Step S02 : injecting cholesteric liquid crystal between the first transparent substrate 12 and the second transparent substrate 14 to form a first cholesteric liquid crystal layer 32 .

[0088] Step S03: thinning the first transparent substrate 12 and the second transparent substrate 14 by chemical grinding, so that the thickness of the first transparent substrate 12 and the second transparent substrate 14 can be adjusted to 0.2-0.5 mm, thereby reducing the overall weight of the double-layer cholesterol liquid crystal display 1.

[0089] Step S04 : forming a second bottom electrode layer 28 on the second transparent substrate 14 .

[0090] Step S05 : injecting cholesteric liquid crystal between the second transparent substrate 14 and the third transparent substrate 16 to form a second cholesteric liquid crystal layer 34 .

[0091] Step S06: thinning the third transparent substrate 16 .

[0092] Step S07 : attaching a first light absorption layer 42 below the first transparent substrate 12 .

[0093] Furthermore, before the step of injecting cholesteric liquid crystal, the manufacturing method 2 further comprises the following steps:

[0094] A plurality of photoresist columns 70 are respectively fabricated below the first cholesterol liquid crystal layer 32 and above the second cholesterol liquid crystal layer 34 to respectively control the uniformity of the two cholesterol liquid crystal layers 30 and fix their positions, and four alignment films 80 are added. The four alignment films 80 are respectively disposed on the upper and lower sides of the two cholesterol liquid crystal layers 30 to align the first cholesterol liquid crystal layer 32 and the second cholesterol liquid crystal layer 34 into two contrasting colors.

[0095] The first cholesterol liquid crystal layer 32 has a first color light 52, and the second cholesterol liquid crystal layer 34 has a second color light 54. The first color light 52 and the second color light 54 are the two contrasting colors. The double-layer cholesterol liquid crystal display 1 further includes a second light absorbing layer 44. The second light absorbing layer 44 can be made by a color filter coating process or other common coating processes, such as sputtering, electroplating, evaporation, chemical vapor deposition (CVD) and other methods. The second light absorbing layer 44 is located between the first cholesterol liquid crystal layer 32 and the second cholesterol liquid crystal layer 34. The second light absorbing layer 44 is used to absorb the wavelength of the second color light 54.

[0096] In summary, the double-layer cholesterol liquid crystal display 1 and the manufacturing method 2 thereof provided by the present invention can achieve the effect of thinner overall volume and lighter weight. In addition, the double-layer cholesterol liquid crystal display 1 can reduce the manufacturing process and improve the yield rate relative to the traditional three-layer cholesterol liquid crystal display. In addition, because the two cholesterol liquid crystal layers 30 have mutually opposite optical rotations, the first color light 52 and the second color light 54 respectively possessed by the two cholesterol liquid crystal layers 30 are the two contrasting colors, which can improve the contrast and reflectivity, thereby effectively improving the overall display effect.

[0097] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention can be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background technology at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation on the claim.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-layer cholesteric liquid crystal display, characterized in that: The double-layer cholesteric liquid crystal display comprises: The three transparent substrates include a first transparent substrate, a second transparent substrate, and a third transparent substrate stacked from bottom to top; Two opposing electrode layers, one opposing electrode layer of the two opposing electrode layers comprises a first upper electrode layer and a first lower electrode layer, the other opposing electrode layer of the two opposing electrode layers comprises a second upper electrode layer and a second lower electrode layer, wherein the first lower electrode layer is disposed on the upper surface of the first transparent substrate, the first upper electrode layer is disposed on the lower surface of the second transparent substrate, the second lower electrode layer is disposed on the upper surface of the second transparent substrate, and the second upper electrode layer is disposed on the lower surface of the third transparent substrate; Two cholesteric liquid crystal layers, comprising a first cholesteric liquid crystal layer and a second cholesteric liquid crystal layer, the two cholesteric liquid crystal layers having opposite optical rotations, wherein the first cholesteric liquid crystal layer is disposed between the first upper electrode layer and the first lower electrode layer, and the second cholesteric liquid crystal layer is disposed between the second upper electrode layer and the second lower electrode layer; and A first light absorbing layer is disposed on the bottom surface of the first transparent substrate.

2. The double-layer cholesteric liquid crystal display according to claim 1, characterized in that: The double-layer cholesterol liquid crystal display further includes two driving ICs, which are electrically coupled to the first lower electrode layer and the second lower electrode layer respectively. Looking down from top to bottom, the double-layer cholesterol liquid crystal display has a display area in the middle and a non-display area around it, wherein the two driving ICs are respectively arranged in the non-display area and on the same side relative to the display area.

3. The double-layer cholesteric liquid crystal display according to claim 1, characterized in that: The double-layer cholesterol liquid crystal display further includes two driving ICs, which are electrically coupled to the first lower electrode layer and the second lower electrode layer respectively. Looking down from top to bottom, the double-layer cholesterol liquid crystal display has a display area in the middle and a non-display area around it, wherein the two driving ICs are respectively arranged in the non-display area and on opposite sides of the display area.

4. The double-layer cholesteric liquid crystal display according to claim 1, characterized in that: The first cholesteric liquid crystal layer has a first color light, and the second cholesteric liquid crystal layer has a second color light.

5. The double-layer cholesteric liquid crystal display according to claim 4, characterized in that: The double-layer cholesteric liquid crystal display further comprises a second light absorbing layer, wherein the second light absorbing layer is located between the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer, and the second light absorbing layer is used for absorbing the wavelength of the second color light.

6. The double-layer cholesteric liquid crystal display according to claim 5, characterized in that: The second lower electrode layer can absorb the wavelength of the second color light and serve as the second light absorption layer.

7. The double-layer cholesteric liquid crystal display according to claim 1, characterized in that: The first cholesterol liquid crystal layer has a first color light, the second cholesterol liquid crystal layer has a second color light, and the first color light and the second color light are contrasting colors.

8. The double-layer cholesteric liquid crystal display according to claim 7, characterized in that: The double-layer cholesteric liquid crystal display further includes four alignment films (PI), which are respectively arranged on the upper and lower sides of the two cholesteric liquid crystal layers to align the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer into the first color light and the second color light of mutually contrasting colors.

9. The double-layer cholesteric liquid crystal display according to claim 1, characterized in that: The double-layer cholesterol liquid crystal display has a plurality of photo-blocking columns (Photo Spacer, PS), which are arranged on the upper and lower outer sides of the two cholesterol liquid crystal layers to respectively control the uniformity of the two cholesterol liquid crystal layers and fix the position of the two cholesterol liquid crystal layers.

10. A method for manufacturing a double-layer cholesteric liquid crystal display, characterized in that: The manufacturing method comprises the following steps: A first lower electrode layer, a first upper electrode layer, and a second upper electrode layer are respectively formed on a first transparent substrate, a second transparent substrate, and a third transparent substrate; Injecting cholesteric liquid crystal between the first transparent substrate and the second transparent substrate to form a first cholesteric liquid crystal layer; thinning the first transparent substrate and the second transparent substrate; forming a second lower electrode layer on the second transparent substrate; injecting cholesteric liquid crystal between the second transparent substrate and the third transparent substrate to form a second cholesteric liquid crystal layer; thinning the third transparent substrate; as well as A first light absorbing layer is attached below the first transparent substrate.

11. The manufacturing method according to claim 10, characterized in that: Before the step of injecting cholesteric liquid crystal, the manufacturing method further comprises the following steps: A plurality of photoresist columns are respectively made below the first cholesterol liquid crystal layer and above the second cholesterol liquid crystal layer to respectively control the uniformity of the two cholesterol liquid crystal layers and fix their positions, and four alignment films are added. The four alignment films are respectively arranged on the upper and lower sides of the two cholesterol liquid crystal layers to align the first cholesterol liquid crystal layer and the second cholesterol liquid crystal layer into two contrasting colors.

12. The manufacturing method according to claim 10, characterized in that: The first cholesterol liquid crystal layer has a first color light, the second cholesterol liquid crystal layer has a second color light, the first color light and the second color light are the two contrasting colors, and the double-layer cholesterol liquid crystal display further includes a second light absorbing layer, the second light absorbing layer is located between the first cholesterol liquid crystal layer and the second cholesterol liquid crystal layer, and the second light absorbing layer is used to absorb the wavelength of the second color light.

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