Reflective liquid crystal display device

Abstract

The application discloses a reflective liquid crystal display device, which comprises an array substrate and a liquid crystal layer; the array substrate is provided with a first polaroid and a first metal wire grid polaroid, the first metal wire grid polaroid is arranged on the side of the first polaroid facing the liquid crystal layer, the light transmission axis of the first metal wire grid polaroid is parallel to the light transmission axis of the first polaroid; the array substrate is provided with a second polaroid and a second metal wire grid polaroid, the second metal wire grid polaroid is arranged on the side of the second polaroid facing the liquid crystal layer, the light transmission axis of the second metal wire grid polaroid is perpendicular to the light transmission axis of the second polaroid, and the light transmission axis of the first polaroid is perpendicular to the light transmission axis of the second polaroid; the light can be repeatedly reflected between the first metal wire grid polaroid and the second metal wire grid polaroid, so that the utilization rate of the light is improved; and the light passing through the second metal wire grid polaroid can be absorbed by the second polaroid, so that a black substrate layer does not need to be additionally arranged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of reflective display technology, and in particular, to a reflective liquid crystal display device. BACKGROUND

[0002] The display panel has the advantages of thinness, durability, low power consumption, and compliance with energy saving and environmental protection, but needs to be used with a backlight source, resulting in a thick module and high cost. Electronic paper displays (reflective displays) have become a kind of display that meets the needs of the public. Electronic paper displays can use external light sources to display images, unlike liquid crystal displays that require a backlight source. Therefore, in the strong sunlight environment, the information on the electronic paper can still be clearly seen without the problem of viewing angle. In addition, electronic paper displays have the advantages of power saving, high reflectivity, and contrast ratio, and are now widely used in electronic readers (such as electronic books and electronic newspapers) or other electronic components (such as price tags).

[0003] Existing electronic paper displays usually adopt E-Ink microcapsule technology (microcapsule electronic ink technology), SiPix microcup technology (microcup electrophoretic display technology), Bridgestone electronic liquid powder technology, cholesteric liquid crystal display (CLCD) technology, micro-electro-mechanical system (MEMS) technology, or electrowetting technology. However, the existing electronic paper display technology is not very mature compared to liquid crystal display technology, has low mass production efficiency, and has relatively high manufacturing cost. Moreover, the existing electronic paper display cannot realize color display.

[0004] In order to realize color reflective display, a reflective liquid crystal display device is usually used, but a polarizer is needed, which causes a lot of loss of light, resulting in a low reflectivity of the reflective liquid crystal display device. When the external light source is weak, the brightness of the reflective liquid crystal display device will be lower, resulting in a low contrast ratio. Reflectivity is an important indicator for evaluating display devices. The higher the reflectivity, the higher the brightness and contrast ratio of the display device, and the better the display effect. Therefore, how to improve the reflectivity of the reflective liquid crystal display device is an important research direction in the field of reflective display. Moreover, in order to achieve better display, a black substrate layer is usually additionally provided on the back of the reflective liquid crystal display device to reduce the brightness of the black state and improve the contrast ratio, but this increases the process difficulty. SUMMARY

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide a reflective liquid crystal display device to solve the problems of low light utilization rate and the need for an additional black substrate layer in the prior art reflective liquid crystal display device.

[0006] The application achieves the purpose by the following technical scheme:

[0007] The application provides a reflective liquid crystal display device, comprising an array substrate, an opposite substrate arranged opposite to the array substrate, and a liquid crystal layer between the opposite substrate and the array substrate.

[0008] The opposite substrate is provided with a first polarizer and a first metal wire grid polarizer formed by a plurality of first metal wire grids arranged in parallel and spaced apart, the first metal wire grid polarizer is arranged on the side of the first polarizer facing the liquid crystal layer, the light transmission axis of the first metal wire grid polarizer is parallel to the light transmission axis of the first polarizer, and the light reflection axis of the first metal wire grid polarizer is perpendicular to the light transmission axis of the first polarizer.

[0009] The array substrate is provided with a second polarizer and a second metal wire grid polarizer formed by a plurality of second metal wire grids arranged in parallel and spaced apart, the second metal wire grid polarizer is arranged on the side of the second polarizer facing the liquid crystal layer, the light transmission axis of the second metal wire grid polarizer is perpendicular to the light transmission axis of the second polarizer, the light reflection axis of the second metal wire grid polarizer is parallel to the light transmission axis of the second polarizer, and the light transmission axis of the first polarizer is perpendicular to the light transmission axis of the second polarizer.

[0010] Further, the array substrate is provided with a first refractive layer and a second refractive layer with different refractive indexes, the first refractive layer is provided with a plurality of protrusions and a plurality of grooves arranged alternately, the second refractive layer covers the protrusions and the grooves, and the first refractive layer, the second refractive layer and the second metal wire grid polarizer are used together for diffuse reflection of light.

[0011] Further, the refractive index of the first refractive layer is greater than the refractive index of the second refractive layer, and the second refractive layer covers the side of the first refractive layer facing the liquid crystal layer.

[0012] Further, the second metal wire grid is arranged on the side of the protrusion facing the second refractive layer and corresponds to the protrusion one by one.

[0013] Further, the second metal wire grid is arranged on the side of the groove facing the second refractive layer and corresponds to the groove one by one, and the height of the protrusion is greater than the height of the second metal wire grid.

[0014] Further, the array substrate is provided with a plurality of pixel electrodes arranged in an array, and the opposing substrate is provided with a common electrode matched with the pixel electrodes, and the liquid crystal molecules in the liquid crystal layer are arranged parallel to the opposing substrate and the array substrate, and the arrangement direction of the liquid crystal layer close to the opposing substrate is perpendicular to the arrangement direction of the liquid crystal layer close to the array substrate.

[0015] Further, the common electrode covers one side of the first wire grid polarizer facing the liquid crystal layer and is in contact with the surface of the first wire grid polarizer.

[0016] Further, the common electrode is insulated and spaced apart from the first wire grid polarizer.

[0017] Further, the array substrate is provided with a plurality of pixel electrodes arranged in an array and a common electrode matched with the pixel electrodes, and the liquid crystal molecules in the liquid crystal layer are arranged parallel to the opposing substrate and the array substrate, and the arrangement direction of the liquid crystal layer close to the opposing substrate is parallel to the arrangement direction of the liquid crystal layer close to the array substrate.

[0018] Further, the first substrate is provided with a black matrix and a color resistance layer, and the black matrix is used to separate the color resistance layers.

[0019] The present application has the advantages that: through the cooperation of the first wire grid polarizer and the second wire grid polarizer, the light can be repeatedly reflected to improve the utilization rate of light; and the light transmission axis of the second wire grid polarizer is perpendicular to the light transmission axis of the second polarizer, so that the light transmitted through the second wire grid polarizer can be absorbed by the second polarizer, without the need for an additional black substrate layer; in addition, the light reflection axis of the first wire grid polarizer is perpendicular to the light transmission axis of the first polarizer, so that the first wire grid polarizer can avoid directly reflecting ambient light and affecting the display quality. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure schematic diagram of the reflective liquid crystal display device in the initial state in the embodiment one of the present application.

[0021] Figure 2 is a plane structure schematic diagram of the array substrate in the embodiment one of the present application.

[0022] Figure 3 is a principle schematic diagram of the wire grid polarizer in the embodiment one of the present application.

[0023] Figure 4 is a three-dimensional structure schematic diagram of the first refractive layer and the second wire grid polarizer in the embodiment one of the present application.

[0024] Figure 5 is a structural schematic diagram of the reflective liquid crystal display device in the bright state in the embodiment one of the present application.

[0025] Figure 6 is a light path principle schematic diagram of the reflective liquid crystal display device in the bright state in the embodiment one of the present application.

[0026] Figure 7 is a structural schematic diagram of the reflective liquid crystal display device in the dark state in the embodiment one of the present application.

[0027] Figure 8 is a light path principle schematic diagram of the reflective liquid crystal display device in the dark state in the embodiment one of the present application.

[0028] Figure 9 is a structural schematic diagram of the reflective liquid crystal display device in the gray scale brightness in the embodiment one of the present application.

[0029] Figure 10 is a light path principle schematic diagram of the reflective liquid crystal display device in the gray scale brightness in the embodiment one of the present application.

[0030] Figure 11 is a structural schematic diagram of the reflective liquid crystal display device in the display picture in the embodiment one of the present application.

[0031] Figure 12 is a structural schematic diagram of the reflective liquid crystal display device in the initial state in the embodiment two of the present application.

[0032] Figure 13 is a three-dimensional structural schematic diagram of the first refractive layer and the second metal wire grid polarizer in the embodiment two of the present application.

[0033] Figure 14 is a structural schematic diagram of the reflective liquid crystal display device in the initial state in the embodiment three of the present application.

[0034] Figure 15 is a structural schematic diagram of the reflective liquid crystal display device in the initial state in the embodiment four of the present application.

[0035] Figure 16 is a planar structural schematic diagram of the array substrate in the embodiment four of the present application.

[0036] Figure 17 is a structural schematic diagram of the reflective liquid crystal display device in the dark state in the embodiment four of the present application.

[0037] Figure 18 is a structural schematic diagram of the reflective liquid crystal display device in the bright state in the embodiment four of the present application.

[0038] Figure 19This is a schematic diagram of the reflective liquid crystal display device in Embodiment 4 of the present invention when displaying a screen. Detailed Implementation

[0039] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed explanation of the specific implementation methods, structure, features, and effects of the reflective liquid crystal display device proposed according to the present invention:

[0040] [Example 1]

[0041] Figure 1 This is a schematic diagram of the reflective liquid crystal display device in its initial state according to Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the planar structure of the array substrate in Embodiment 1 of the present invention.

[0042] like Figure 1 and Figure 2 As shown, a reflective liquid crystal display device provided in Embodiment 1 of the present invention includes an array substrate 20, a counter substrate 10 disposed opposite to the array substrate 20, and a liquid crystal layer 30 located between the counter substrate 10 and the array substrate 20. The counter substrate 10 is disposed on the side of the reflective liquid crystal display device closest to the external environment. In this embodiment, the liquid crystal molecules in the liquid crystal layer 30 are positive liquid crystal molecules (liquid crystal molecules with positive dielectric anisotropy), such as... Figure 1 As shown, in the initial state, the liquid crystal molecules in the liquid crystal layer 30 are positive liquid crystal molecules and are in a flat position. The alignment direction of the liquid crystal layer 30 is parallel to the opposing substrate 10 and the array substrate 20. The alignment direction of the liquid crystal layer 30 on the side closer to the opposing substrate 10 is perpendicular to the alignment direction on the side closer to the array substrate 20. That is, the liquid crystal molecules in the liquid crystal layer 30 are twisted 90° from the opposing substrate 10 toward the array substrate 20 to form a TN display mode.

[0043] The opposing substrate 10 is provided with a first polarizer 41 and a first metal wire grid polarizer 13 formed by multiple first metal wire grids 131 arranged in parallel and spaced intervals. The first metal wire grid polarizer 13 is disposed on the side of the first polarizer 41 facing the liquid crystal layer 30. The light transmission axis of the first metal wire grid polarizer 13 is parallel to the light transmission axis of the first polarizer 41, and the light transmission axis of the first metal wire grid polarizer 13 is perpendicular to the light reflection axis of the first metal wire grid polarizer 13, that is, the light reflection axis of the first metal wire grid polarizer 13 is perpendicular to the light transmission axis of the first polarizer 41. Both the first metal wire grid polarizer 13 and the first polarizer 41 are planar structures that cover the entire opposing substrate 10. The first metal wire grid polarizer 13 is disposed on the side of the opposing substrate 10 away from the liquid crystal layer 30, and the first polarizer 41 is disposed on the side of the opposing substrate 10 facing the liquid crystal layer 30.

[0044] The array substrate 20 is provided with a second polarizer 42 and a second metal wire grid polarizer 21 formed by a plurality of second metal wire grids 211 arranged in parallel and spaced apart from each other, the second metal wire grid polarizer 21 is arranged on the side of the second polarizer 42 facing the liquid crystal layer 30, the transmission axis of the second metal wire grid polarizer 21 is perpendicular to the transmission axis of the second polarizer 42, the transmission axis of the second metal wire grid polarizer 21 is perpendicular to the reflection axis of the second metal wire grid polarizer 21, that is, the reflection axis of the second metal wire grid polarizer 21 is parallel to the transmission axis of the second polarizer 42. The transmission axis of the first polarizer 41 is perpendicular to the transmission axis of the second polarizer 42, that is, the transmission axis of the first metal wire grid polarizer 13 and the transmission axis of the second metal wire grid polarizer 21 are both parallel to the transmission axis of the first polarizer 41. The second metal wire grid polarizer 21 and the second polarizer 42 are both planar structures that cover the array substrate 20, the second metal wire grid polarizer 21 is arranged on the side of the array substrate 20 away from the liquid crystal layer 30, and the second polarizer 42 is arranged on the side of the array substrate 20 facing the liquid crystal layer 30.

[0045] Through the cooperation of the first metal wire grid polarizer 13 and the second metal wire grid polarizer 21, the light can be repeatedly reflected between the first metal wire grid polarizer 13 and the second metal wire grid polarizer 21 to improve the utilization rate of light. Moreover, the transmission axis of the second metal wire grid polarizer 21 is perpendicular to the transmission axis of the second polarizer 42, so that the light transmitted through the second metal wire grid polarizer 21 can be absorbed by the second polarizer 42, naturally forming a black background without the need for an additional black substrate layer. In addition, the transmission axis of the first metal wire grid polarizer 13 is perpendicular to the reflection axis of the first metal wire grid polarizer 13, which can avoid the direct reflection of ambient light by the first metal wire grid polarizer 13, thereby affecting the display quality.

[0046] Figure 3 is a schematic diagram of the metal wire grid polarizer in the first embodiment of the present application. As shown in Figure 3 The metal wire grid polarizer (the first metal wire grid polarizer 13 and the second metal wire grid polarizer 21) has a special polarizing property, that is, it transmits polarized light perpendicular to the extension direction of the metal wire grid and reflects polarized light parallel to the extension direction of the metal wire grid. In the incident light A, the polarization direction of the light has a first polarized light a1 perpendicular to the extension direction of the metal wire grid and a second polarized light a2 parallel to the extension direction of the metal wire grid, and the first polarized light a1 perpendicular to the extension direction of the metal wire grid can pass through the metal wire grid polarizer to form transmitted light C, and the second polarized light a2 parallel to the extension direction of the metal wire grid will be reflected to form reflected light B. For more detailed introduction of the metal wire grid polarizer, please refer to the prior art, which will not be repeated here.

[0047] As shown in Figure 1As shown, the opposed substrate 10 is provided with a black matrix 11 and color resistance layers 12 corresponding to the pixel units P, the black matrix 11 separates the color resistance layers 12 from each other, the color resistance layers 12 include red, green and blue color resistance materials, and correspond to the red, green and blue pixel units P respectively, so that the reflective liquid crystal display device can realize full-color reflective display. Of course, in other embodiments, the opposed substrate 10 is provided with a black matrix 11 and transparent regions corresponding to the pixel units P, the black matrix 11 separates the transparent regions from each other, that is, the opposed substrate 10 does not need to be provided with the color resistance layers 12, so that the reflective liquid crystal display device can realize black-and-white reflective display.

[0048] In the embodiment, the array substrate 20 is provided with a plurality of pixel electrodes 22 arranged in an array, and the opposed substrate 10 is provided with a common electrode 14 matched with the pixel electrodes 22, a vertical electric field is formed between the pixel electrodes 22 and the common electrode 14 to drive the liquid crystal molecules in the liquid crystal layer 30 to deflect in the vertical direction, so as to control the gray scale brightness. The common electrode 14 is a surface electrode covering the opposed substrate 10, and the pixel electrode 22 is a block electrode corresponding to the pixel unit P. In the embodiment, the common electrode 14 covers one side of the first metal wire grid polarizer 13 facing the liquid crystal layer 30 and contacts the surface of the first metal wire grid polarizer 13, that is, the common electrode 14 is conductively connected with the first metal wire grid polarizer 13, so as to reduce the impedance of the common electrode 14.

[0049] As shown in the figure, Figure 2 The array substrate 20 is provided with a plurality of scan lines 1 and a plurality of data lines 2 on the side facing the liquid crystal layer 30, the plurality of scan lines 1 and the plurality of data lines 2 are insulated and crossed to define a plurality of pixel units P, each pixel unit P is provided with a pixel electrode 22 and a thin film transistor 3, and the pixel electrode 22 is electrically connected with the data line 2 adjacent to the thin film transistor 3 through the thin film transistor 3. The thin film transistor 3 includes a gate, an active layer, a drain and a source, the gate is located in the same layer as the scan line 1 and is electrically connected, the gate is insulated from the active layer through an insulating layer, the source is electrically connected with the data line 2, and the drain is electrically connected with the pixel electrode 22 through a contact hole.

[0050] Figure 4 is a schematic diagram of the stereoscopic structure of the first refractive layer and the second metal wire grid polarizer in the first embodiment of the present application. As shown in the figure, Figure 1 and Figure 4As shown, the array substrate 20 is provided with a first refractive layer 201 and a second refractive layer 202 with different refractive indexes, the first refractive layer 201 is provided with a plurality of protrusions 201a and a plurality of grooves 201b arranged alternately, and the second refractive layer 202 covers the protrusions 201a and the grooves 201b. The first refractive layer 201, the second refractive layer 202 and the second metal wire grid polarizer 21 are collectively used for diffuse reflection of light. In the embodiment, the refractive index of the first refractive layer 201 is greater than the refractive index of the second refractive layer 202, and the second refractive layer 202 covers the side of the first refractive layer 201 facing the liquid crystal layer 30. Of course, in other embodiments, the refractive index of the first refractive layer 201 can also be less than the refractive index of the second refractive layer 202. The first refractive layer 201 and the second refractive layer 202 can be made of OC materials with different refractive indexes.

[0051] In the embodiment, the second metal wire grid 211 is arranged on the side of the protrusion 201a facing the second refractive layer 202 and corresponds to the protrusion 201a one by one, that is, the second metal wire grid 211 is directly arranged on the protrusion 201a, and the second refractive layer 202 covers the second metal wire grid 211. Therefore, when the first refractive layer 201 and the second metal wire grid polarizer 21 are manufactured, a mask and a layer of photoresist can be shared, thereby reducing the manufacturing cost. Moreover, arranging the second metal wire grid polarizer 21 between the first refractive layer 201 and the second refractive layer 202 can make the side of the array substrate 20 facing the liquid crystal layer 30 more flat, avoid poor liquid crystal alignment, solve the problem of light leakage in dark state, improve the contrast ratio and improve the picture quality.

[0052] The opposing substrate 10 and the array substrate 20 can be made of glass, acrylic and polycarbonate materials. The materials of the common electrode 14 and the pixel electrode 22 can be indium tin oxide (ITO) or indium zinc oxide (IZO) and the like. The materials of the first metal wire grid polarizer 13 and the second metal wire grid polarizer 21 include Al (aluminum) or Mo (molybdenum) and the like.

[0053] Figure 5 is a structural schematic diagram of the reflective liquid crystal display device in the bright state in Embodiment One of the present application. Figure 6 is a light path principle schematic diagram of the reflective liquid crystal display device in the bright state in Embodiment One of the present application. As shown in Figure 5 In the bright state of the reflective liquid crystal display device, no voltage is applied to the pixel electrode 22, and the liquid crystal molecules in the liquid crystal layer 30 remain in the initial twisted 90° state. As shown in Figure 6As shown, ambient light I passes through the first polarizer 41 and becomes linearly polarized light (e.g., 0°). The linearly polarized light passes through the first metal wire grid polarizer 13 and is still linearly polarized light (e.g., 0°). The linearly polarized light passes through the liquid crystal layer 30, rotates 90° and becomes parallel to the reflective axis of the second metal wire grid polarizer 21, and is then reflected back by the second metal wire grid polarizer 21. The reflected light passes through the liquid crystal layer 30, rotates 90° and becomes parallel to the transmission axis of the first metal wire grid polarizer 13, and then passes through the first metal wire grid polarizer 13 and the first polarizer 41 in sequence, and is emitted from the first polarizer 41 to achieve a bright state.

[0054] Figure 7 This is a schematic diagram of the reflective liquid crystal display device in the dark state according to Embodiment 1 of the present invention. Figure 8 This is a schematic diagram of the optical path principle of the reflective liquid crystal display device in the dark state according to Embodiment 1 of the present invention. Figure 7 As shown, in the reflective liquid crystal display device, a common voltage is applied to the common electrode 14 in the dark state, and a dark state voltage (e.g., 5V) is applied to the pixel electrode 22, forming a strong vertical electric field between the pixel electrode 22 and the common electrode 14. Figure 7 In E1), the liquid crystal molecules in the liquid crystal layer 30 are deflected in the vertical direction and perpendicular to the opposing substrate 10 and the array substrate 20. For example... Figure 8 As shown, ambient light I passes through the first polarizer 41 and becomes linearly polarized light (e.g., 0°). The linearly polarized light passes through the first metal grid polarizer 13 and is still linearly polarized light (e.g., 0°). The linearly polarized light passes through the liquid crystal layer 30 without rotating and is parallel to the transmission axis of the second metal grid polarizer 21. After passing through the second metal grid polarizer 21, it is absorbed by the second polarizer 42 to achieve a dark state.

[0055] Figure 9 This is a schematic diagram of the reflective liquid crystal display device in embodiment one of the present invention at grayscale brightness. Figure 10 This is a schematic diagram of the optical path principle of the reflective liquid crystal display device in embodiment one of the present invention at grayscale brightness. At grayscale brightness, a common voltage is applied to the common electrode 14, and a corresponding grayscale voltage (e.g., between 0-5V) is applied to the pixel electrode 22, forming a strong vertical electric field between the pixel electrode 22 and the common electrode 14. Figure 9 In the case of E2), the liquid crystal molecules in the liquid crystal layer 30 are deflected in the vertical direction and form a certain tilt angle between the opposing substrate 10 and the array substrate 20. At this time, the liquid crystal layer 30 has a certain phase retardation (e.g., λ / 4). Figure 10As shown, ambient light I becomes linearly polarized light (e.g. 0°) after passing through the first polarizer 41, the linearly polarized light is still linearly polarized light (e.g. 0°) after passing through the first metal wire grid polarizer 13, the linearly polarized light becomes first circularly polarized light after passing through the liquid crystal layer 30, part of the first circularly polarized light is absorbed by the second polarizer 42 after passing through the second metal wire grid polarizer 21, another part of the first circularly polarized light is reflected back by the second metal wire grid polarizer 21 and becomes second circularly polarized light after passing through the liquid crystal layer 30, part of the second circularly polarized light passes through the first metal wire grid polarizer 13 and the first polarizer 41 in turn to achieve the gray scale brightness, another part of the second circularly polarized light is reflected back by the first metal wire grid polarizer 13 and becomes third circularly polarized light after passing through the liquid crystal layer 30, and so on. The light is repeatedly reflected between the first metal wire grid polarizer 13 and the second metal wire grid polarizer 21 to improve the utilization rate of the light.

[0056] Figure 11 is a structural schematic diagram of the reflective liquid crystal display device in the embodiment one of the present application when displaying a picture. Figure 11 As shown, when the reflective liquid crystal display device displays a normal pattern, a common voltage is applied to the common electrode 14 and a driving voltage (0-255 gray scale) is applied to the pixel electrode 22, so that an electric field with different intensities is formed between the pixel electrode 22 and the common electrode 14 to drive the liquid crystal molecules in the liquid crystal layer 30 to deflect in the vertical direction with different amplitudes, thereby controlling the intensity of the reflected light and realizing normal display of the picture.

[0057] [Embodiment two]

[0058] Figure 12 is a structural schematic diagram of the reflective liquid crystal display device in the initial state in the embodiment two of the present application. Figure 13 is a structural schematic diagram of the first refractive layer and the second metal wire grid polarizer in the embodiment two of the present application. Figure 12 and Figure 13 As shown, the reflective liquid crystal display device provided by the embodiment two of the present application is basically the same as the reflective liquid crystal display device in the embodiment one of the present application, and the difference lies in that: Figures 1 to 11

[0059] ​In the embodiment, the second metal wire grid 211 is arranged on the side of the groove 201b facing the second refractive layer 202 and corresponds to the groove 201b one by one, and the height of the protrusion 201a is greater than the height of the second metal wire grid 211, that is, the second metal wire grid 211 is arranged in the groove 201b, so that the diffuse reflection effect can be improved. In the embodiment, a mask can be shared when manufacturing the first refractive layer 201 and the second metal wire grid polarizer 21, but positive photoresist and negative photoresist need to be used respectively. For example, when manufacturing the first refractive layer 201, the mask is used to expose and develop the positive photoresist, and then the first refractive layer 201 is etched to form the protrusion 201a and the groove 201b; when manufacturing the second metal wire grid polarizer 21, the same mask is used to expose and develop the negative photoresist, and then etching is performed to form the second metal wire grid 211 in the groove 201b.

[0060] Those skilled in the art should understand that the remaining structures and working principles of the embodiment are the same as those of Embodiment One, which will not be described here.

[0061] [Embodiment Three]

[0062] Figure 14 is a structural schematic diagram of a reflective liquid crystal display device in an initial state in Embodiment Three of the present application. As shown in Figure 14 , the reflective liquid crystal display device provided in Embodiment Three of the present application is basically the same as the reflective liquid crystal display devices in Embodiments One Figures 1 to 11 ), Two Figure 12 and Four Figure 13 , and the difference is that:

[0063] In the embodiment, the common electrode 14 and the first metal wire grid polarizer 13 are insulated and spaced apart from each other. The common electrode 14 can be arranged on the side of the first metal wire grid polarizer 13 facing the liquid crystal layer 30, or the first metal wire grid polarizer 13 can be arranged on the side of the common electrode 14 facing the liquid crystal layer 30.

[0064] Those skilled in the art should understand that the remaining structures and working principles of the embodiment are the same as those of Embodiment One and Embodiment Two, which will not be described here.

[0065] [Embodiment Four]

[0066] Figure 15 is a structural schematic diagram of a reflective liquid crystal display device in an initial state in Embodiment Four of the present application. Figure 16 is a planar structural schematic diagram of an array substrate in Embodiment Four of the present application. As shown in Figure 15 and Figure 16 , the reflective liquid crystal display device provided in Embodiment Four of the present application is basically the same as the reflective liquid crystal display devices in Embodiments OneFigures 1 to 11 ), the reflective liquid crystal display device in example two ( Figure 12 and Figure 13 ) is basically the same, except that:

[0067] In this embodiment, the array substrate 20 is provided with a plurality of pixel electrodes 22 arranged in an array and a common electrode 14 cooperating with the pixel electrodes 22, that is, the common electrode 14 is arranged on the array substrate 20. Among them, the common electrode 14 and the pixel electrode 22 are located in different layers and are insulated and separated by an insulating layer. The common electrode 14 can be located above or below the pixel electrode 22 (as shown in Figure 15 , the common electrode 14 is located below the pixel electrode 22). Preferably, the common electrode 14 is a planar electrode arranged in an entire plane, and the pixel electrode 22 is a slit electrode having a plurality of electrode strips in each pixel unit to form a fringe field switching mode (FFS). Of course, in other embodiments, the pixel electrode 22 and the common electrode 14 are located in the same layer, but they are insulated and separated from each other, and the pixel electrode 22 and the common electrode 14 each can include a plurality of electrode strips, and the electrode strips of the pixel electrode 22 and the electrode strips of the common electrode 14 are alternately arranged to form an in-plane switching mode (IPS).

[0068] In this embodiment, the liquid crystal molecules in the liquid crystal layer 30 are positive liquid crystal molecules, that is, the dielectric anisotropy is positive. The liquid crystal molecules in the liquid crystal layer 30 are aligned parallel to the opposing substrate 10 and the array substrate 20, and the alignment direction of the liquid crystal layer 30 close to the opposing substrate 10 side is parallel to the alignment direction of the liquid crystal layer 30 close to the array substrate 20 side.

[0069] Figure 17 is a structural schematic diagram of the reflective liquid crystal display device in the dark state in example four of the present application. As Figure 17 shown, in the dark state of the reflective liquid crystal display device, no voltage is applied to the pixel electrode 22, and the liquid crystal molecules in the liquid crystal layer 30 remain in the initial flat state. Referring to Figure 8 shown, the ambient light I passes through the first polarizer 41 to become linearly polarized light (for example, 0°), the linearly polarized light passes through the first metal wire grid polarizer 13 and is still linearly polarized light (for example, 0°), the linearly polarized light passes through the liquid crystal layer 30 without rotating and is parallel to the transmission axis of the second metal wire grid polarizer 21, and is absorbed by the second polarizer 42 after passing through the second metal wire grid polarizer 21 to achieve the dark state.

[0070] Figure 18 is a structural schematic diagram of the reflective liquid crystal display device in the bright state in example four of the present application. As Figure 18As shown, in the bright state, the common voltage is applied to the common electrode 14, the bright state voltage (for example, 5V) is applied to the pixel electrode 22, and a strong horizontal electric field is formed between the pixel electrode 22 and the common electrode 14. Figure 18 In the middle E3, the liquid crystal molecules in the liquid crystal layer 30 are deflected in the horizontal direction, at this time, the liquid crystal layer 30 has a certain phase delay (for example, λ / 4). Referring to Figure 10 As shown, the ambient light I becomes linearly polarized light (for example, 0°) by passing through the first polarizer 41, the linearly polarized light is still linearly polarized light (for example, 0°) by passing through the first metal wire grid polarizer 13, the linearly polarized light becomes first circularly polarized light by passing through the liquid crystal layer 30, part of the light of the first circularly polarized light is absorbed by the second polarizer 42 after passing through the second metal wire grid polarizer 21, and the other part of the light is reflected back by the second metal wire grid polarizer 21 and becomes second circularly polarized light when passing through the liquid crystal layer 30, part of the light of the second circularly polarized light passes through the first metal wire grid polarizer 13 and the first polarizer 41 in turn to achieve the gray scale brightness, and the other part of the light is reflected back by the first metal wire grid polarizer 13 and becomes third circularly polarized light when passing through the liquid crystal layer 30, and so on, the light is repeatedly reflected between the first metal wire grid polarizer 13 and the second metal wire grid polarizer 21 to improve the utilization rate of the light.

[0071] Figure 19 It is a structure schematic diagram of the reflective liquid crystal display device in the embodiment four when displaying a picture. As shown in the figure, Figure 19 As shown, in the reflective liquid crystal display device when displaying a normal pattern, the common voltage is applied to the common electrode 14, the driving voltage (0-255 gray scale) is applied to the pixel electrode 22, so that the electric field of different intensities is formed between the pixel electrode 22 and the common electrode 14, to drive the liquid crystal molecules in the liquid crystal layer 30 to be deflected in the horizontal direction with different amplitudes, so as to control the strength of the reflected light, and realize the normal display of the picture.

[0072] Those skilled in the art should understand that the remaining structure and working principle of the embodiment are the same as those of the first embodiment and the second embodiment, and will not be described here.

[0073] In this paper, the above, below, left, right, front, back and other orientation words are defined according to the position of the structure in the figure and the position of the structure relative to each other in the figure, just to express the technical scheme clearly and conveniently. It should be understood that the use of the orientation words should not limit the scope of the application. It should also be understood that the terms "first" and "second" used in this paper are only used for name distinction, and do not limit the quantity and order.

[0074] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications to the disclosed technical content, as equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, are still within the protection scope of the technical solution of the present application.

Claims

1. A reflective liquid crystal display device, characterized in that, It includes an array substrate (20), a counter substrate (10) disposed opposite to the array substrate (20), and a liquid crystal layer (30) located between the counter substrate (10) and the array substrate (20); The opposing substrate (10) is provided with a first polarizer (41) and a first metal wire grid polarizer (13) formed by multiple first metal wire grids (131) arranged in parallel and spaced intervals. The first metal wire grid polarizer (13) is disposed on the side of the first polarizer (41) facing the liquid crystal layer (30). The light transmission axis of the first metal wire grid polarizer (13) is parallel to the light transmission axis of the first polarizer (41), and the light reflection axis of the first metal wire grid polarizer (13) is perpendicular to the light transmission axis of the first polarizer (41). The array substrate (20) is provided with a second polarizer (42) and a second metal wire grid polarizer (21) formed by multiple second metal wire grids (211) arranged in parallel and spaced intervals. The second metal wire grid polarizer (21) is disposed on the side of the second polarizer (42) facing the liquid crystal layer (30). The light transmission axis of the second metal wire grid polarizer (21) is perpendicular to the light transmission axis of the second polarizer (42). The light reflection axis of the second metal wire grid polarizer (21) is parallel to the light transmission axis of the second polarizer (42). The light transmission axis of the first polarizer (41) is perpendicular to the light transmission axis of the second polarizer (42). The array substrate (20) is provided with a first refractive layer (201) and a second refractive layer (202) with different refractive indices. The first refractive layer (201) is provided with multiple protrusions (201a) and multiple grooves (201b) arranged alternately. The second refractive layer (202) covers the protrusions (201a) and the grooves (201b). The first refractive layer (201), the second refractive layer (202) and the second metal wire grid polarizer (21) are used together to diffusely reflect light. The second metal wire grid (211) is disposed on the side of the protrusion (201a) facing the second refractive layer (202) and corresponds one-to-one with the protrusion (201a). Alternatively, the second metal wire grid (211) is disposed on the side of the groove (201b) facing the second refractive layer (202) and corresponds one-to-one with the groove (201b). The height of the protrusion (201a) is greater than the height of the second metal wire grid (211).

2. The reflective liquid crystal display device according to claim 1, characterized in that, The refractive index of the first refractive layer (201) is greater than that of the second refractive layer (202), and the second refractive layer (202) covers the side of the first refractive layer (201) facing the liquid crystal layer (30).

3. The reflective liquid crystal display device according to any one of claims 1-2, characterized in that, The array substrate (20) is provided with a plurality of pixel electrodes (22) arranged in an array, and the opposing substrate (10) is provided with a common electrode (14) that cooperates with the pixel electrodes (22). The liquid crystal molecules in the liquid crystal layer (30) are aligned parallel to the opposing substrate (10) and the array substrate (20). The alignment direction of the liquid crystal layer (30) on the side closer to the opposing substrate (10) is perpendicular to the alignment direction on the side closer to the array substrate (20).

4. The reflective liquid crystal display device according to claim 3, characterized in that, The common electrode (14) covers the side of the first metal wire grid polarizer (13) facing the liquid crystal layer (30) and is in contact with the surface of the first metal wire grid polarizer (13).

5. The reflective liquid crystal display device according to claim 3, characterized in that, The common electrode (14) is insulated from and spaced apart from the first metal wire grid polarizer (13).

6. The reflective liquid crystal display device according to any one of claims 1-2, characterized in that, The array substrate (20) is provided with a plurality of pixel electrodes (22) arranged in an array and a common electrode (14) cooperating with the pixel electrodes (22). The liquid crystal molecules in the liquid crystal layer (30) are aligned parallel to the opposing substrate (10) and the array substrate (20). The alignment direction of the liquid crystal layer (30) on the side closer to the opposing substrate (10) is parallel to the alignment direction on the side closer to the array substrate (20).

7. The reflective liquid crystal display device according to any one of claims 1-2, characterized in that, The opposing substrate (10) is provided with a black matrix (11) and a color resist layer (12), wherein the black matrix (11) is used to space the multiple color resist layers (12) apart from each other.

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