Bistable reflective color liquid crystal display screen and display equipment

Abstract

The utility model provides a bistable reflection type color liquid crystal display screen and display equipment, the bistable reflection type color liquid crystal display screen comprises a plurality of single-layer liquid crystal box frameworks arranged in an array mode, and each single-layer liquid crystal box framework comprises a first transparent substrate and a TFT substrate which are oppositely arranged; the liquid crystal layer is located between the first transparent substrate and the TFT substrate; the liquid crystal layer is divided into three pixel areas which are isolated from one another, and each pixel area is filled with single-color cholesteric liquid crystal; the conducting layer comprises a first conducting layer clamped between the first transparent substrate and the liquid crystal layer and a second conducting layer arranged on the surface, facing one side of the first conducting layer, of the TFT substrate; the ink layer is arranged on the side, away from the first transparent substrate, of the TFT substrate in a stacked mode, the ink layer is provided with color matrixes in one-to-one correspondence with the pixel areas, and blank areas between the color matrixes are filled with black ink. According to the technical scheme, single-layer cholesteric liquid crystal colorization can be achieved, and the liquid crystal display device has the advantages of being ultrathin, simple in structure, low in cost and the like.

Description

Technical Field

[0001] The present application belongs to the technical field of liquid crystal display devices, and more specifically, to a bistable reflective color liquid crystal display screen and a display device. Background Art

[0002] The cholesteric liquid crystal bistable display is a reflective display in the liquid crystal display device. Its characteristic is that it uses the external ambient light to display images without the need for a backlight source. Specifically, the technical characteristics of the cholesteric liquid crystal bistable display are that the two planar textures (p state) and focal cone textures (fc state) can both exist stably without the action of an external electric field; in the p state, if the wavelength of the incident light matches the pitch, the light will be reflected, and the reflected light is circularly polarized light; in the fc state, the light is scattered due to the disordered distribution of the pitch; under the action of an external electric field, these two states can switch between each other, thus having a bistable characteristic. Since the two texture states used for display are stable in the absence of an external field, it is not necessary to apply an external field for a long time to maintain the display state, so the cholesteric liquid crystal bistable display has the characteristic of saving power.

[0003] In the prior art, for cholesteric liquid crystal bistable display screens, due to the requirements of the liquid crystal pitch, a single-cell structure can only perform monochrome display or black and white display. If color display is required, a three-layer liquid crystal cell structure is usually required. Due to the use of a three-layer liquid crystal cell structure, the display screen is thicker and has poor specifications. In addition, due to the use of a three-layer liquid crystal cell structure, its production process is complicated, the cost is high, and the structure is complex and the stability is poor. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a bistable reflective color liquid crystal display screen to solve the technical problems in the prior art that the cholesteric liquid crystal bistable display screen is overall thick, has a complex structure and is costly.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is: to provide a bistable reflective color liquid crystal display screen, the bistable reflective color liquid crystal display screen comprises a plurality of single-layer liquid crystal cell structures arranged in an array, each single-layer liquid crystal cell structure comprises:

[0006] a first transparent substrate;

[0007] A TFT substrate, arranged opposite to the first transparent substrate;

[0008] A liquid crystal layer is located between the first transparent substrate and the TFT substrate; the liquid crystal layer is divided into three mutually isolated pixel regions, each pixel region is filled with a monochromatic cholesteric liquid crystal;

[0009] The conductive layer includes a first conductive layer and a second conductive layer, wherein the first conductive layer is sandwiched between the first transparent substrate and the liquid crystal layer; and the second conductive layer is disposed on a surface of the TFT substrate facing the first conductive layer.

[0010] The ink layer is stacked on the side of the TFT substrate away from the first transparent substrate. The ink layer is provided with a color matrix corresponding to each pixel area one by one, and the blank area between the color matrices is filled with black ink.

[0011] Optionally, each single-layer liquid crystal box structure further includes a frame, and two ends of the frame are respectively connected to the TFT substrate and the first conductive layer; the frame encloses a cavity area of ​​the liquid crystal layer.

[0012] Optionally, the second conductive layer is disposed in the cavity region, and an outer edge of the second conductive layer is connected to an inner side surface of the frame.

[0013] Optionally, an insulating layer is further provided on the top surface of the second conductive layer facing the first transparent substrate.

[0014] Optionally, a spacer is provided in the cavity region, and two ends of the spacer are respectively in contact with the first conductive layer and the insulating layer; the spacer divides the cavity region into a plurality of mutually isolated pixel regions.

[0015] Optionally, the pitch of the liquid crystal layer is 3µm to 8µm.

[0016] Optionally, the three pixel regions include a first pixel region, a second pixel region and a third pixel region; the color block corresponding to the position of the first pixel region in the color matrix is ​​the first primer region, the color block corresponding to the position of the second pixel region is the second primer region, and the color block corresponding to the position of the third pixel region is the third primer region;

[0017] The monochromatic cholesteric liquid crystals injected into the first pixel region, the second pixel region and the third pixel region are all arranged to reflect the same color light among the three primary colors;

[0018] The first primer area is black, the second primer area is one of the three primary colors, and is different from the liquid crystal reflection color of the second pixel area; the color of the third primer area is one of the three primary colors, and is different from the liquid crystal reflection color of the third pixel area and the color of the second primer area.

[0019] Optionally, the first transparent substrate and the TFT substrate are connected by frame glue.

[0020] The present application also proposes a display device, which includes the bistable reflective color liquid crystal display screen as described above.

[0021] The beneficial effects of the bistable reflective color liquid crystal display provided by the present application are: the bistable reflective color liquid crystal display has the following advantages: first, the bistable reflective color liquid crystal display directly uses cholesteric liquid crystal as the display material, has its own color, eliminates the need for polarizers and backlight, has the advantages of low power consumption and low cost, and can effectively reduce environmental pollution caused by battery consumption. At the same time, the technical solution uses a method of superimposing the color matrix on the ink layer with multiple pixel areas in the liquid crystal layer, that is, a method of superimposing the colors of the multi-color primer on the ink layer and the monochromatic cholesteric liquid crystal as the display material, and uses the mixing principle to realize the colorization of a single layer of cholesteric liquid crystal; thereby achieving the purpose of preparing a low-power reflective color liquid crystal display; this method can realize colorization at low cost and conveniently, not only retaining the bistable characteristics of the cholesteric liquid crystal, but also the preparation cost of the multi-color primer is low, and different colors are separated by a black matrix, so it can be flexibly adjusted according to display requirements; therefore, this new method of colorization of a single layer of cholesteric liquid crystal has the advantages of very thin thickness, low cost, low power consumption, battery power supply, easy to move and easy to carry, etc., compared with the existing method of realizing colorization by mixing three-color liquid crystals through a three-layer liquid crystal box architecture. In addition, this bistable reflective color liquid crystal display can also be combined with TFT display technology to realize active display, low colorization cost, and feasibility of large-scale mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic cross-sectional structure diagram of a single-layer liquid crystal cell architecture provided in an embodiment of the present application;

[0024] Description of Figure Numbers:

[0025] DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should also be noted that the directional terms such as left, right, up and down in the embodiments of the present application are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0033] The embodiment of the present application provides a bistable reflective color liquid crystal display screen.

[0034] See also Figure 1In one embodiment, the bistable reflective color liquid crystal display screen includes a plurality of single-layer liquid crystal cell structures, each of which includes a first transparent substrate 100, a TFT (Thin Film Transistor) substrate 200, a liquid crystal layer 300, a conductive layer, and an ink layer 500. Specifically, the TFT substrate 200 is disposed opposite to the first transparent substrate 100. The liquid crystal layer 300 is located between the first transparent substrate 100 and the TFT substrate 200; the liquid crystal layer 300 is divided into three mutually isolated pixel regions, each of which is filled with a monochromatic cholesteric liquid crystal. The conductive layer includes a first conductive layer 410 and a second conductive layer 420, the first conductive layer 410 is sandwiched between the first transparent substrate 100 and the liquid crystal layer 300; the second conductive layer 420 is disposed on the surface of the TFT substrate 200 facing the first conductive layer 410. The ink layer 500 is stacked on the side of the TFT substrate 200 away from the first transparent substrate 100. The ink layer 500 is provided with a color matrix corresponding to each pixel area one by one, and the blank area between the color matrices is filled with black ink.

[0035] Based on this structural design, the bistable reflective color liquid crystal display has the following advantages: First, the bistable reflective color liquid crystal display directly uses cholesteric liquid crystal as the display material, has its own color, eliminates the need for polarizers and backlight, has the advantages of low power consumption and low cost, and can effectively reduce environmental pollution caused by battery consumption. At the same time, the technical solution uses a method of superimposing the color matrix on the ink layer 500 with multiple pixel areas in the liquid crystal layer 300, that is, the color superposition method of the multi-color primer on the ink layer 500 and the monochrome cholesteric liquid crystal as the display material, and the colorization of the single-layer cholesteric liquid crystal is realized by the mixing principle; thereby, the purpose of preparing a low-power reflective color liquid crystal display screen can be achieved; this method can realize colorization at low cost and conveniently, not only retaining the bistable characteristics of the cholesteric liquid crystal, but also the preparation cost of the multi-color primer is low, and different colors are separated by a black matrix, so it can be flexibly adjusted according to display requirements; therefore, this new method of colorization of a single-layer cholesteric liquid crystal has the advantages of very thin thickness, low cost, low power consumption, battery power supply, easy to move and easy to carry, etc., compared with the existing method of realizing colorization by mixing three-color liquid crystals through a three-layer liquid crystal box architecture. In addition, the bistable reflective color liquid crystal display screen can also cooperate with TFT display technology to realize active display, low colorization cost, and feasibility of large-scale mass production.

[0036] See also Figure 1In this embodiment, each single-layer liquid crystal box structure further includes a frame 600, and the two ends of the frame 600 are respectively connected to the TFT substrate 200 and the first conductive layer 410; the frame 600 encloses the cavity area of ​​the liquid crystal layer 300. Furthermore, in order to facilitate the process and reduce the manufacturing cost, the first transparent substrate 100 and the TFT substrate 200 are glued together by the frame 600. Here, the frame 600 mainly plays the role of supporting the TFT substrate 200 and the first transparent substrate 100, and encloses and defines the space of the liquid crystal layer 300.

[0037] See also Figure 1 Specifically in this embodiment, the second conductive layer 420 is disposed in the cavity area, and the outer edge of the second conductive layer 420 is connected to the inner side surface of the frame 600 .

[0038] For further information, see Figure 1 In this embodiment, an insulating layer 700 is also attached to the top surface of the second conductive layer 420 facing the first transparent substrate 100. The insulating layer 700 is mainly used to insulate the liquid crystal layer 300 from the second conductive layer 420 and the TFT substrate 200 to ensure that the circuit of the display screen can work normally.

[0039] See also Figure 1 In this embodiment, a spacer 310 is provided in the cavity region, and the two ends of the spacer 310 are respectively in contact with the first conductive layer 410 and the insulating layer 700; the spacer 310 divides the cavity region into a plurality of mutually isolated pixel regions. Specifically, in this embodiment, in order to obtain a better display effect and an ultra-thin design of the display screen, the spacing of the liquid crystal layer 300 is preferably controlled to be 3µm to 8µm. Here, the spacer 310 can be, but is not limited to, a spacer column or a spacer to control the spacing.

[0040] It should be noted here that the three pixel areas include the first pixel area 320, the second pixel area 330 and the third pixel area 340; the color block corresponding to the position of the first pixel area 320 in the color matrix is ​​the first primer area 510, the color block corresponding to the position of the second pixel area 330 is the second primer area 520, and the color block corresponding to the position of the third pixel area 340 is the third primer area 530. The monochrome cholesteric liquid crystals infused in the first pixel area 320, the second pixel area 330 and the third pixel area 340 are all set to reflect the same color light of the three primary colors. The first primer area 510 is black, the second primer area 520 is one of the three primary colors, and is different from the liquid crystal reflection color of the second pixel area 330; the color of the third primer area 530 is one of the three primary colors, and is different from the liquid crystal reflection color of the third pixel area 340 and the color of the second primer area 520. Specifically, Figure 1As shown, in this embodiment, the first pixel area 320, the second pixel area 330 and the third pixel area 340 of the liquid crystal layer 300 are all green, and in the color matrix of the ink layer 500, the second primer area 520 is red, and the third primer area 530 is blue. Under the control of the external electric field, the first pixel area 320, the second pixel area 330 and the third pixel area 340 can all present two states of light and dark, and different colors can be achieved by mixing the colors of different primer areas. In other words, when displaying, by applying a voltage between the first conductive layer 410 and the second conductive layer 420, the deflection of the liquid crystal molecules is controlled, so as to produce a superimposed effect with the color on the pixel area, and produce color according to the color mixing principle. For example, when the first pixel area 320 is bright, the second pixel area 330 is bright, and the third pixel area 340 is bright, it is a mixture of green, yellow, and blue, and then displays green to the outside; when the first pixel area 320 is bright, the second pixel area 330 is dark, and the third pixel area 340 is dark, it is a mixture of green, red, and blue, and then displays white to the outside; when the first pixel area 320 is dark, the second pixel area 330 is dark, and the third pixel area 340 is bright, it is a mixture of black, red, and blue, and then displays black to the outside; when the first pixel area 320 is dark, the second pixel area 330 is dark, and the third pixel area 340 is dark, it is a mixture of black, red, and blue, and then displays purple to the outside. Of course, in other embodiments, the color of the pixel area and each primer area can also be other settings, as long as the two colors can be superimposed and mixed to achieve colorization. It can be understood that the setting of the present application can make the superposition and mixing of each color more uniform, which is conducive to improving the color display effect. Of course, the blanks between each primer area are filled with black ink, which can effectively avoid the color blur caused by color mixing.

[0041] The present application also proposes a display device, which includes the aforementioned bistable reflective color liquid crystal display. The specific structure of the bistable reflective color liquid crystal display refers to the above-mentioned embodiment. Since the present display device adopts all the technical solutions of all the above-mentioned embodiments, it also has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A bistable reflective color liquid crystal display, characterized in that: A single-layer liquid crystal cell structure is provided, each of which comprises: a first transparent substrate; A TFT substrate, arranged opposite to the first transparent substrate; A liquid crystal layer is located between the first transparent substrate and the TFT substrate; the liquid crystal layer is divided into three pixel regions isolated from each other, and each of the pixel regions is filled with a monochromatic cholesteric liquid crystal; The conductive layer comprises a first conductive layer and a second conductive layer, wherein the first conductive layer is sandwiched between the first transparent substrate and the liquid crystal layer; and the second conductive layer is disposed on a surface of the TFT substrate facing the first conductive layer. The ink layer is stacked on the side of the TFT substrate away from the first transparent substrate. The ink layer is provided with a color matrix corresponding to each pixel area one by one, and the blank areas between the color matrices are filled with black ink.

2. The bistable reflective color liquid crystal display screen according to claim 1, characterized in that: Each of the single-layer liquid crystal box structures further includes a frame, two ends of which are respectively connected to the TFT substrate and the first conductive layer; the frame encloses a cavity area of ​​the liquid crystal layer.

3. The bistable reflective color liquid crystal display screen according to claim 2, characterized in that: The second conductive layer is disposed in the cavity region, and an outer edge of the second conductive layer is connected to an inner side surface of the frame.

4. The bistable reflective color liquid crystal display screen according to claim 3, characterized in that: An insulating layer is also attached to the top surface of the second conductive layer facing the first transparent substrate.

5. The bistable reflective color liquid crystal display screen according to claim 4, characterized in that: A spacer is provided in the cavity region, and two ends of the spacer are respectively in contact with the first conductive layer and the insulating layer; the spacer divides the cavity region into a plurality of pixel regions isolated from each other.

6. The bistable reflective color liquid crystal display screen according to claim 5, characterized in that: The pitch of the liquid crystal layer is 3µm to 8µm.

7. The bistable reflective color liquid crystal display according to any one of claims 2 to 6, characterized in that: The three pixel regions include a first pixel region, a second pixel region and a third pixel region; the color block corresponding to the position of the first pixel region in the color matrix is ​​a first primer region, the color block corresponding to the position of the second pixel region is a second primer region, and the color block corresponding to the position of the third pixel region is a third primer region; The monochromatic cholesteric liquid crystals injected into the first pixel region, the second pixel region and the third pixel region are all arranged to reflect the same color light among the three primary colors; The first primer area is black, the second primer area is one of three primary colors, and is different from the liquid crystal reflection color of the second pixel area; the color of the third primer area is one of three primary colors, and is different from the liquid crystal reflection color of the third pixel area and the color of the second primer area.

8. The bistable reflective color liquid crystal display screen according to claim 2, characterized in that: The first transparent substrate and the TFT substrate are connected via the frame adhesive.

9. A display device, characterized in that: It comprises a bistable reflective color liquid crystal display screen as described in any one of claims 1 to 8.

Images