Liquid crystal display panel, display device, and driving method thereof

Abstract

The application provides a liquid crystal display panel, a display device and a driving method thereof. The liquid crystal display panel comprises a cholesteric liquid crystal unit and a display unit. The cholesteric liquid crystal unit comprises at least one light-adjusting pixel area. The light-adjusting pixel area comprises cholesteric liquid crystal. The light-adjusting pixel area has a light-reflecting state and a light-transmitting state. In the light-reflecting state, the light-adjusting pixel area is used for reflecting at least one monochromatic light. The display unit is located on one side of the cholesteric liquid crystal unit. The display unit comprises a first display area and a second display area. The first display area comprises a plurality of display sub-areas. Each display sub-area comprises a first color pixel and a white pixel. The second display area is arranged around the periphery of the first display area. The orthographic projection of the light-adjusting pixel area on the plane of an outlight surface at least partially overlaps the orthographic projection of the white pixel on the plane of the outlight surface. The method ensures that the display effect of the liquid crystal display panel is good by arranging the cholesteric liquid crystal unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display screens, in particular to a liquid crystal display panel, a display device and a driving method thereof. BACKGROUND

[0002] In the current under-screen camera technology, in order to improve the light transmittance when the camera takes pictures, compared with the RGB composition mode of the display area, the under-screen camera area usually adopts RGBW technology to increase white light through white pixels. However, due to the difference in pixel composition between the display area and the camera area, there is a certain difference in display effect between the camera area and the display area, which further leads to poor display uniformity of the display screen.

[0003] Therefore, there is an urgent need for a way to solve the problem of poor uniformity of the display screen caused by the difference in pixel composition of the camera in the prior art. SUMMARY

[0004] The main purpose of the present application is to provide a liquid crystal display panel, a display device and a driving method thereof to solve the problem of poor uniformity of the display screen caused by the difference in pixel composition of the camera in the prior art.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the embodiments of the present application provide a liquid crystal display panel, comprising a cholesteric liquid crystal unit and a display unit, wherein the cholesteric liquid crystal unit comprises at least one light-adjusting pixel area, the light-adjusting pixel area comprises cholesteric liquid crystal, the light-adjusting pixel area has a light reflection state and a light transmission state, in the light reflection state, the light-adjusting pixel area is used for reflecting at least one monochromatic light, in the light transmission state, the light-adjusting pixel area is used for transmitting light; the display unit is located on one side of the cholesteric liquid crystal unit, the display unit comprises a first display area and a second display area surrounding the periphery of the first display area, the first display area comprises a plurality of display sub-areas, each display sub-area comprises a first color pixel and a white pixel, and the light-adjusting pixel area is at least partially overlapped with the white pixel in the orthographic projection of the light-emitting surface.

[0006] In a second aspect, the embodiments of the present application also provide a display device, comprising a backlight panel, a light-sensitive element and any one of the liquid crystal display panels, wherein the backlight panel has a first through hole; the light-sensitive element is located in the first through hole of the backlight panel; and the liquid crystal display panel is located on one side of the backlight panel.

[0007] In a third aspect, the embodiments of the present application further provide a driving method of a display device, the driving method comprising: in the case that a photographing request is received, controlling the cholesteric liquid crystal unit to be powered on, so that the liquid crystal molecules in the cholesteric liquid crystal unit are vertically arranged, the helical structure disappears, and the cholesteric liquid crystal unit is in a light transmission state; in the case that the photographing request is not received, controlling the cholesteric liquid crystal unit to be powered off, so that the liquid crystal molecules in the cholesteric liquid crystal unit are horizontally arranged, the helical structure is presented, and the cholesteric liquid crystal unit is in a light reflection state.

[0008] In the embodiments of the present application, the cholesteric liquid crystal unit is arranged on one side of the display unit, and the cholesteric liquid crystal unit comprises at least one light-adjusting pixel region. In addition, the orthographic projection of the light-adjusting pixel region on the plane where the light emitting surface is located at least partially overlaps with the orthographic projection of the white pixel in the display unit on the plane where the light emitting surface is located, and the white pixel corresponds to the camera region of the liquid crystal display panel, so that the cholesteric liquid crystal unit corresponds to at least part of the camera region. In addition, the cholesteric liquid crystal unit has the light reflection state and the light transmission state, so that when the cholesteric liquid crystal unit is in the light transmission state, the cholesteric liquid crystal unit can transmit more light, and the photographing effect of the camera is ensured to be good. When the cholesteric liquid crystal unit is in the light reflection state, the cholesteric liquid crystal unit is used for reflecting at least one monochromatic light, and the problem that the display screen is colorless due to the white pixel transmitting white light in the prior art is avoided. The problem that the uniformity of the display screen is poor due to the difference in pixel composition of the camera in the prior art is solved, and the display effect of the liquid crystal display panel is ensured to be good. BRIEF DESCRIPTION OF DRAWINGS

[0009] The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0010] Figure 1 A structural schematic diagram of a display device in the prior art is shown;

[0011] Figure 2 A structural schematic diagram of a cholesteric liquid crystal unit in the embodiments of the present application is shown;

[0012] Figure 3 A structural schematic diagram of a display unit in the embodiments of the present application is shown;

[0013] Figure 4 A structural schematic diagram of a liquid crystal display panel in the embodiments of the present application is shown;

[0014] Figure 5 A position structural schematic diagram of a light-adjusting pixel region and a white pixel in the embodiments of the present application is shown;

[0015] Figure 6 A top view structural schematic diagram showing that the light-adjusting pixel region in an embodiment of the present application comprises two light-adjusting sub-pixel regions is shown;

[0016] Figure 7 A top view structural schematic diagram showing that the light-adjusting pixel region in an embodiment of the present application comprises three light-adjusting sub-pixel regions is shown;

[0017] Figure 8 A top view structural schematic diagram showing the first light-adjusting sub-pixel region, the second light-adjusting sub-pixel region and the third light-adjusting sub-pixel region in an embodiment of the present application is shown;

[0018] Figure 9 A reflection spectrum schematic diagram of the cholesteric liquid crystal cell in an embodiment of the present application is shown;

[0019] Figure 10 A top view structural schematic diagram of the first color pixel in an embodiment of the present application is shown;

[0020] Figure 11 A structural schematic diagram of the first support substrate, the second support substrate and the isolation structure in an embodiment of the present application is shown;

[0021] Figure 12 A structural schematic diagram of the common electrode and the pixel electrode in an embodiment of the present application is shown;

[0022] Figure 13 A top view structural schematic diagram of the cholesteric liquid crystal cell with the second alignment mark in an embodiment of the present application is shown;

[0023] Figure 14 A top view structural schematic diagram of the display unit with the first alignment mark in an embodiment of the present application is shown;

[0024] Figure 15 A structural schematic diagram of various shapes of the first alignment mark and the second alignment mark in an embodiment of the present application is shown;

[0025] Figure 16 A structural schematic diagram of the display device in an embodiment of the present application is shown;

[0026] Figure 17 A flow schematic diagram of the driving method of the display device according to an embodiment of the present application is shown.

[0027] Among the above figures, the following figure marks are included:

[0028] 10, AA region; 20, CUP region; 30, cholesteric liquid crystal cell; 40, display cell; 50, back light panel; 60, light sensing element; 70, liquid crystal display panel; 301, light adjusting pixel region; 302, light adjusting sub-pixel region; 303, first light adjusting sub-pixel region; 304, second light adjusting sub-pixel region; 305, third light adjusting sub-pixel region; 306, first support substrate; 307, isolation structure; 308, second support substrate; 309, common electrode; 310, pixel electrode; 311, second alignment mark; 401, first display region; 402, second display region; 403, display sub-region; 404, first color pixel; 405, white pixel; 406, red sub-pixel; 407, blue sub-pixel; 408, green sub-pixel; 409, first alignment mark. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed description is merely exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0030] It is also important to note that the terms "including", "comprising", and / or "having" as used herein are specifically intended to be open-ended and also to mean including, but not limited to. As used herein, the singular forms "a", "an" and / or "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0031] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, it will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element, or intervening elements can also be present.

[0032] It should be noted that the described embodiments are merely exemplary of the application, and that only a portion of the total number of embodiments is described, and that all other embodiments falling within the scope of the application are intended to be embraced therein.

[0033] In the prior art, for example, Figure 1As shown, the display screen includes an AA (Active Area, operable area) region 10 and a CUP (Camera Under Pannel, under-panel camera) region 20, the CUP region 20 corresponds to the area of the camera, and the AA region 10 corresponds to the area other than the camera. In order to improve the light transmittance when the camera is taking pictures, the CUP region usually adopts the design of RGBW (Red Green Blue White), but when displaying a pure color picture and the white pixel is turned on, the white pixel transmits white light, so that the white light and the color light are mixed, thereby causing the color to be light, and when displaying a pure color picture and the white pixel is turned off, a black area will appear at the position corresponding to the white pixel due to the white pixel being turned off, thereby the display picture forms obvious horizontal lines in the camera area, wherein whether the camera is turned on or not, the white pixel can be turned on or turned off according to the requirement.

[0034] To solve the above problems, embodiments of the present application provide a liquid crystal display panel, a display device and a driving method thereof.

[0035] According to the embodiments of the present application, a liquid crystal display panel is provided, such as Figure 2 、 Figure 3 and Figure 4As shown, the liquid crystal display panel includes a cholesteric liquid crystal cell 30 and a display unit 40. The cholesteric liquid crystal cell 30 includes at least one light-adjusting pixel region 301. The light-adjusting pixel region 301 includes cholesteric liquid crystal. By changing the type and / or proportion of chiral agent in the cholesteric liquid crystal, the light-adjusting pixel region 301 can reflect light of different wavelengths. The light-adjusting pixel region 301 has a reflection state and a transmission state. In the reflection state, the light-adjusting pixel region 301 is used to reflect at least one monochromatic light. In the transmission state, the light-adjusting pixel region is used to transmit light. The display unit 40 is located on one side of the cholesteric liquid crystal cell 30. The display unit 40 includes a first display region 401 and a second display region 402. The second display region 402 surrounds the periphery of the first display region 401. The first display region 401 corresponds to the region of the camera, i.e., the projection of the camera in the display unit 40 coincides with the first display region 401. The second display region 402 corresponds to the AA region, i.e., the second display region 402 is the region of the display unit 40 other than the first display region 401. The first display region 401 includes a plurality of display sub-regions 403. Each display sub-region 403 includes a first color pixel 404 and a white pixel 405. For example, the first color pixel 404 includes RGB pixels. The second display region 402 can include color pixels. The orthogonal projection of the light-adjusting pixel region 301 on the plane of the light-emitting surface at least partially overlaps the orthogonal projection of the white pixel 405 on the plane of the light-emitting surface. Therefore, at least part of the projection of the light-adjusting pixel region 301 in the display unit 40 overlaps the white pixel 405, i.e., the light-adjusting pixel region 301 corresponds to at least part of the region of the camera.

[0036] In the above embodiment, the cholesteric liquid crystal cell is arranged on one side of the display unit, the cholesteric liquid crystal cell comprises at least one light-adjusting pixel region, and a projection of the light-adjusting pixel region on a plane where the light-emitting surface is located at least partially overlaps with a projection of a white pixel in the display unit on the plane where the light-emitting surface is located, and the white pixel corresponds to a camera region of the liquid crystal display panel, so that the cholesteric liquid crystal cell corresponds to at least a part of the camera region. Since the cholesteric liquid crystal cell has the light reflection state and the light transmission state, when the cholesteric liquid crystal cell is in the light transmission state, the cholesteric liquid crystal cell can transmit more light, and the photographing effect of the camera is ensured to be good. When the cholesteric liquid crystal cell is in the light reflection state, the cholesteric liquid crystal cell is used for reflecting at least one monochromatic light, which avoids the problem that the display screen is not bright in the prior art due to the fact that the white pixel transmits white light, solves the problem that the uniformity of the display screen is poor in the prior art due to the difference in pixel composition of the camera, and ensures that the display effect of the liquid crystal display panel is good.

[0037] In the prior art, when the white pixel in the RGBW corresponding to the camera region does not transmit light, the position corresponding to the white pixel forms a black region when the display screen displays a picture, thereby forming obvious horizontal lines, and the display picture of the display screen is not clear. Of course, at the same time, all the white pixels are not turned on or turned off at the same time, but according to the actual situation, part of the white pixels are turned off, and the other white pixels are turned on. The specific time of turning on or turning off the white pixels and the number of turned-on white pixels are determined according to actual needs. The liquid crystal display panel comprises the display unit and the cholesteric liquid crystal cell. Since the projection of the light-adjusting pixel region in the cholesteric liquid crystal cell on the plane where the light-emitting surface is located at least partially overlaps with the projection of the white pixel in the display unit on the plane where the light-emitting surface is located, when the white pixel is turned off and does not transmit light, the light-adjusting pixel region corresponding to the turned-on white pixel can reflect at least one monochromatic light, so that the entire display picture is clearer (the area where horizontal lines appear is not obvious due to the fact that other areas are clearer), the problem that the camera region of the display screen is not clear in the prior art is solved, and the display uniformity of the liquid crystal display panel is ensured to be good.

[0038] Specifically, by doping a chiral agent in the cholesteric liquid crystal, when the liquid crystal molecules in the cholesteric liquid crystal cell are in a horizontal state, the cholesteric liquid crystal has a certain period of helical structure, and the cholesteric liquid crystal cell is in a reflection state, i.e., the light reflection state. When the liquid crystal molecules in the cholesteric liquid crystal cell are in a vertical state, the helical structure of the cholesteric liquid crystal disappears, and the cholesteric liquid crystal cell is in a full transmission state, i.e., the light transmission state.

[0039] In addition, in order to ensure that the liquid crystal display panel has good light transmission, the proportion of the area corresponding to the white pixels in the entire display sub-area is greater than or equal to 80%.

[0040] Since the first display area includes a plurality of display sub-areas, and each display sub-area includes white pixels, and each white pixel will transmit white light in the open state and cause color fading, in order to further ensure that the liquid crystal display panel has good display effect, in some optional embodiments, as shown in Figure 5 The cholesteric liquid crystal cell includes a plurality of light-adjusting pixel areas 301, and the plurality of light-adjusting pixel areas 301 are arranged one by one corresponding to the plurality of white pixels 405, that is, one white pixel corresponds to one light-adjusting pixel area, and the projection of each light-adjusting pixel area 301 on the plane of the light-emitting surface at least partially overlaps the projection of the corresponding white pixel 405 on the plane of the light-emitting surface. Specifically, the projection of each light-adjusting pixel area 301 on the plane of the light-emitting surface can completely overlap the projection of the corresponding white pixel 405 on the plane of the light-emitting surface, or the projection of each light-adjusting pixel area 301 on the plane of the light-emitting surface can partially overlap the projection of the corresponding white pixel 405 on the plane of the light-emitting surface. By arranging a plurality of light-adjusting pixel areas one by one corresponding to a plurality of white pixels, at least one monochromatic light can be reflected by the light-adjusting pixel area corresponding to the white pixel in the open state, avoiding the problem of color fading caused by the transmission of white light by each white pixel, and further ensuring that the liquid crystal display panel has good display effect.

[0041] In some optional embodiments, as shown in Figure 5 The projection of the light-adjusting pixel area 301 on the plane of the light-emitting surface coincides with the projection of the white pixel 405 on the plane of the light-emitting surface, and in the case of a plurality of light-adjusting pixel areas, the projection of each light-adjusting pixel area 301 on the plane of the light-emitting surface coincides with the projection of the corresponding white pixel 405 on the plane of the light-emitting surface. Since the projection of the light-adjusting pixel area coincides with the projection of the white pixel, the projection of each light-adjusting pixel area in the display unit can completely correspond to the area corresponding to the white pixel, further avoiding the problem of color fading caused by the transmission of white light by the white pixel in the prior art.

[0042] Of course, the projection of the light-adjusting pixel area on the plane of the light-emitting surface and the projection of the white pixel on the plane of the light-emitting surface are not limited to coincidence, and the projection of the light-adjusting pixel area on the plane of the light-emitting surface can be greater than or less than the projection of the white pixel on the plane of the light-emitting surface.

[0043] Since the liquid crystal display panel is mainly used to realize color display, in order to make the display color of the light adjusting pixel region and other regions of the display panel adapt to each other, so as to further ensure that the display effect of the liquid crystal display panel is better, in some optional embodiments, as shown in Figure 6 The light adjusting pixel region 301 includes at least two light adjusting sub-pixel regions 302, and the two light adjusting sub-pixel regions 302 reflect light of different colors. Since the light adjusting pixel region includes at least two light adjusting sub-pixel regions, and the reflected light is of different colors, the cholesteric liquid crystal cell can reflect light of multiple colors, further ensuring that the liquid crystal display panel can display at least two colors, and further ensuring that the display effect of the liquid crystal display panel is better.

[0044] Specifically, as shown in Figure 6 The light adjusting pixel region 301 can include two light adjusting sub-pixel regions 302, wherein the light reflected by the two light adjusting sub-pixel regions 302 can include any two of red light, green light and blue light, and of course can be light of other colors, and the specific color is not limited, and the light adjusting pixel region can also include more than three light adjusting sub-pixel regions, which can be determined according to actual conditions. As shown in Figure 7 The light adjusting pixel region 301 can include three light adjusting sub-pixel regions 302, wherein the three light adjusting sub-pixel regions 302 can reflect red light, green light and blue light, and of course can also reflect light of other three different colors, which can be determined according to the color of the light emitted by the first color pixel 404.

[0045] In addition, in the case of reflecting any single color light in the light adjusting pixel region, the bandwidth of the single color light is within a certain interval.

[0046] Since the first color pixel in the first display region of the liquid crystal display panel generally emits red, green and blue light, in order to further ensure that the pixel unit and the light emitted by the first color pixel adapt to each other, so that the display effect of the liquid crystal display panel is better, in some optional embodiments, as shown in Figure 8As shown, the above-mentioned light-adjusting sub-pixel region includes a first light-adjusting sub-pixel region 303, a second light-adjusting sub-pixel region 304, and a third light-adjusting sub-pixel region 305. Since the above-mentioned first color pixel generally emits red, green and blue light, the above-mentioned first light-adjusting sub-pixel region 303 is used for reflecting red light, the above-mentioned second light-adjusting sub-pixel region 304 is used for reflecting green light, and the above-mentioned third light-adjusting sub-pixel region 305 is used for reflecting blue light. Since the above-mentioned light-adjusting sub-pixel region includes three and is used for reflecting red, green and blue light respectively, it is ensured that the above-mentioned camera region can emit red, green and blue light as the other regions, further ensuring that the display screen of the above-mentioned camera region and the other regions is less different, and further ensuring that the display effect of the above-mentioned liquid crystal display panel is better.

[0047] Specifically, as shown, Figure 8 The sum of the lengths of the above-mentioned first light-adjusting sub-pixel region 303, the above-mentioned second light-adjusting sub-pixel region 304 and the above-mentioned third light-adjusting sub-pixel region 305 in the above-mentioned second direction d2 is equal to the length of the above-mentioned white pixel 405 in the above-mentioned second direction. Of course, the sum of the lengths of the above-mentioned first light-adjusting sub-pixel region 303, the above-mentioned second light-adjusting sub-pixel region 304 and the above-mentioned third light-adjusting sub-pixel region 305 in the above-mentioned second direction d2 can also be less than or greater than the length of the above-mentioned white pixel 405 in the above-mentioned second direction d2, and the lengths of the above-mentioned first light-adjusting sub-pixel region 303, the above-mentioned second light-adjusting sub-pixel region 304 and the above-mentioned third light-adjusting sub-pixel region 305 in the above-mentioned second direction d2 can be the same or different.

[0048] In order to ensure that the manufacturing process of the three above-mentioned light-adjusting sub-pixel regions is relatively simple, in some optional embodiments, the above-mentioned first light-adjusting sub-pixel region, the above-mentioned second light-adjusting sub-pixel region and the above-mentioned third light-adjusting sub-pixel region include the same kind of chiral agent, and in addition, the content of the chiral agent in the above-mentioned first light-adjusting sub-pixel region, the content of the chiral agent in the above-mentioned second light-adjusting sub-pixel region and the content of the chiral agent in the above-mentioned third light-adjusting sub-pixel region increase in turn.

[0049] Of course, the chiral agent in the above-mentioned first light-adjusting sub-pixel region, the above-mentioned second light-adjusting sub-pixel region and the above-mentioned third light-adjusting sub-pixel region is not limited to the same kind, and the chiral agent in the three light-adjusting sub-pixel regions can be different, as long as the wavelengths of the light reflected by the three light-adjusting sub-pixel regions meet the requirements.

[0050] In a specific embodiment, the period coefficient of the spiral structure of the above-mentioned cholesteric liquid crystal cell is proportional to the wavelength of the reflected light, that is, by doping different contents of chiral agents in the above-mentioned cholesteric liquid crystal, spiral structures with different period coefficients can be obtained, so that the above-mentioned cholesteric liquid crystal cell reflects light with different wavelengths.

[0051] Specifically, the relationship between the content of the chiral agent and the color of reflected light will be explained below, Figure 9 A schematic diagram of the bandwidth reflection spectrum of the above-mentioned cholesteric liquid crystal cell is shown in FIG. 1, in which a certain bandwidth of the reflection spectrum is shown, and the maximum wavelength λ1 and the minimum wavelength λ2 of the reflection spectrum are shown. Figure 9 As shown in FIG. 1, λ1 = n e P, λ2 = n o P, wherein λ1 is the maximum wavelength of the reflection spectrum, λ2 is the minimum wavelength of the reflection spectrum, n o is the refractive index of o light, n e is the refractive index of e light, P is the period coefficient, and λ0 is the middle value of the reflection spectrum, and Δλ = λ1- λ2 = Δn·P is calculated, and because wherein, as shown in Table 1 below, HTP (Helical Twist Power, helical twist power) is a material property coefficient of the above-mentioned chiral agent, and c is the content of the above-mentioned chiral agent, if n e = 1.799, n o = 1.527 of the above-mentioned cholesteric liquid crystal, then (n e +n o ) / 2 = 1.663, P = 390.8 nm is calculated when the red light is 650 nm, P = 330.7 nm is calculated when the green light is 550 nm, and P = 270.6 nm is calculated when the blue light is 450 nm, and because the wavelengths of the red light, the green light and the blue light decrease, P decreases, and because Therefore, it can be known that the c corresponding to the red light, the green light and the blue light should increase, so that the light reflected by different light modulation sub-pixels in the above-mentioned cholesteric liquid crystal cell is respectively the red light, the green light and the blue light.

[0052] Table 1

[0053] Chiral species HTP (pm) -1 ]] S-811 -14 IS-4651 -13.6

[0054] In a specific embodiment, Table 1 lists the HTP values of two common chiral agents, and the helical structure of the period coefficient P can form Bragg reflection.

[0055] In some optional embodiments, the display sub-regions in the above-mentioned first display region include the above-mentioned first color pixels and the above-mentioned white pixels, as shown in FIG. 2. Figure 10As shown in FIG. 4, the first color pixel 404 includes three sub-pixels, i.e., a red sub-pixel 406, a blue sub-pixel 407 and a green sub-pixel 408. The orthographic projection area of the light-adjusting sub-pixel area 302 on the white pixel 405 corresponds to the sub-pixel, and the color of the light emitted by the sub-pixel is the same as the color of the light reflected by the light-adjusting sub-pixel area 302 corresponding to the orthographic projection area. For example, when the light emitted by the sub-pixel is red, the light-adjusting sub-pixel area corresponding to the orthographic projection area of the light-adjusting sub-pixel area 302 on the white pixel 405 also reflects red light. Since the orthographic projection area of the light-adjusting sub-pixel area on the white pixel corresponds to the sub-pixel, and the color of the light emitted by the sub-pixel is the same as the color of the light reflected by the light-adjusting sub-pixel area corresponding to the orthographic projection area, the display effect of the liquid crystal display panel is further ensured to be good.

[0056] In some optional embodiments, as shown in FIG. 5, the display sub-area includes a first color pixel 404 and a white pixel 405 located on one side of the first color pixel 404 in a first direction d1. The three sub-pixels in the first color pixel are distributed along a second direction d2, and the second direction d2 is perpendicular to the first direction d1. The three orthographic projection areas of the three light-adjusting sub-pixel areas 302 on the white pixel 405 are arranged along the second direction d2. Figure 10 As shown in FIG. 5, the display sub-area includes a first color pixel 404 and a white pixel 405 located on one side of the first color pixel 404 in a first direction d1. The three sub-pixels in the first color pixel are distributed along a second direction d2, and the second direction d2 is perpendicular to the first direction d1. The three orthographic projection areas of the three light-adjusting sub-pixel areas 302 on the white pixel 405 are arranged along the second direction d2. Figure 10 The dashed line in FIG. 5 mainly represents the position of the projection of the light-adjusting sub-pixel area 302 in the white pixel 405.

[0057] Specifically, as shown in FIG. 6, the display sub-area includes a first color pixel 404 and a white pixel 405 located on one side of the first color pixel 404 in a first direction d1. The three sub-pixels in the first color pixel are distributed along a second direction d2, and the second direction d2 is perpendicular to the first direction d1. The three orthographic projection areas of the three light-adjusting sub-pixel areas 302 on the white pixel 405 are arranged along the second direction d2. Figure 10 FIG. 6 shows one arrangement mode of the first color pixel 404 and the white pixel 405. Of course, the arrangement mode of the first color pixel 404 and the white pixel 405 is not limited to the above arrangement mode, and the specific arrangement mode can be determined according to actual conditions.

[0058] In order to further ensure that the cholesteric liquid crystal unit is located in a fixed area, in some optional embodiments, as shown in FIG. 7, the display sub-area includes a first color pixel 404 and a white pixel 405 located on one side of the first color pixel 404 in a first direction d1. The three sub-pixels in the first color pixel are distributed along a second direction d2, and the second direction d2 is perpendicular to the first direction d1. The three orthographic projection areas of the three light-adjusting sub-pixel areas 302 on the white pixel 405 are arranged along the second direction d2. Figure 11As shown, the cholesteric liquid crystal unit further comprises a first support substrate 306 and at least two isolation structures 307 on the first support substrate 306, and the adjacent two isolation structures 307 and the first support substrate 306 between the two isolation structures form the light-adjusting pixel area 301, wherein the number of the light-adjusting sub-pixel areas 302 included in each light-adjusting pixel area 301 includes one, two or three. For example, in the case that the light-adjusting pixel area 301 includes at least two adjacent light-adjusting sub-pixel areas 302, the number of the isolation structures is three, and the adjacent two isolation structures 307 form the light-adjusting sub-pixel area 302. By arranging the first support substrate and the at least two isolation structures on the first support substrate, the light-adjusting pixel area is formed, and each light-adjusting sub-pixel area can be formed, so that the light-adjusting sub-pixel areas with different chiral agent contents can be obtained during the manufacturing process of the light-adjusting sub-pixel areas, and the light with different colors reflected by the light-adjusting sub-pixel areas is ensured, and the display effect of the liquid crystal display panel is further ensured to be good.

[0059] Specifically, as shown in the first aspect of the present application, Figure 11 As shown, the cholesteric liquid crystal unit further comprises a second support substrate 308, and the second support substrate is arranged opposite to the first support substrate 306, and the adjacent two isolation structures 307, the first support substrate 306 between the two isolation structures and the second support substrate 308 form the light-adjusting pixel area 301, and in the case that the light-adjusting pixel area 301 includes at least two light-adjusting sub-pixel areas 302, the adjacent two isolation structures 307, the first support substrate 306 and the second support substrate 308 form the light-adjusting sub-pixel area 302.

[0060] Since the light reflected by the light-adjusting sub-pixel areas in each light-adjusting pixel area has different wavelengths, in order to realize the manufacturing of cholesteric liquid crystal with different chiral agents or different contents of chiral agents, the present application forms multiple independent spaces by the first support substrate, the second support substrate and the multiple isolation structures, so that each independent space corresponds to one light-adjusting sub-pixel area, and by pouring the liquid cholesteric liquid crystal into the independent space, and the cholesteric liquid crystal has the corresponding chiral agent and the corresponding content, the light-adjusting sub-pixel area which can reflect light with the corresponding wavelength is obtained.

[0061] In addition, the first support substrate, the second support substrate and the isolation material are all transparent materials, and specifically, the first support substrate, the second support substrate and the isolation material include glass.

[0062] In a specific embodiment, the forming process of the cholesteric liquid crystal unit is as follows: first, the first support substrate, the second support substrate and the plurality of isolation structures are formed to form independent spaces, and a plurality of light-adjusting sub-pixel regions are obtained; then, a corresponding liquid cholesteric liquid crystal is filled in each light-adjusting sub-pixel region, and the cholesteric liquid crystal contains a chiral agent.

[0063] Of course, the structure of the cholesteric liquid crystal unit is not limited to the above-mentioned manner, and a three-layer cholesteric liquid crystal unit can also be made, and the three-layer cholesteric liquid crystal unit reflects light of different colors.

[0064] In order to further ensure that the display effect of the liquid crystal display unit is good, and because the colors of the reflected light of the light-adjusting sub-pixel regions are different, in some optional embodiments, as shown in Figure 12 The cholesteric liquid crystal unit also includes a common electrode 309 and a pixel electrode 310, the common electrode 309 and the pixel electrode 310 are located on both sides of the light-adjusting pixel region 301 in the third direction d3, and in the case that the light-adjusting pixel region 301 includes at least two light-adjusting sub-pixel regions 302, the pixel electrode 310 has a plurality of pixel electrodes 310, and the pixel electrode 310 is located on one side of the light-adjusting sub-pixel region 302 one by one, and the third direction d3 is the thickness direction of the cholesteric liquid crystal unit. By setting the common electrode and the pixel electrode, and the pixel electrode corresponding to the light-adjusting sub-pixel region one by one, it can be ensured that the light-adjusting sub-pixel region presents the light-transmitting state when energized, and presents the reflecting state when the light-adjusting sub-pixel region is not energized, and can reflect light of different colors, thereby solving the problems of color fading and horizontal lines in the camera region in the prior art, and further ensuring that the display effect of the liquid crystal display panel is good.

[0065] Specifically, as shown in Figure 12 The isolation structure 307 is arranged between the two adjacent pixel electrodes 310, and the isolation structure 307 isolates the two adjacent pixel electrodes 310.

[0066] In order to ensure that the light-adjusting pixel region in the cholesteric liquid crystal unit is aligned with the white pixel in the display unit during the manufacturing process, in some optional embodiments, as shown in Figure 13 and Figure 14As shown, the display unit 40 further comprises at least one first alignment mark 409, and the cholesteric liquid crystal cell 30 further comprises at least one second alignment mark 311. When there is only one first alignment mark 409, the first alignment mark 409 corresponds to the second alignment mark 311. When there are multiple first alignment marks 409 and multiple second alignment marks 311, at least one second alignment mark 311 corresponds to at least one first alignment mark 409. In order to ensure the position of the cholesteric liquid crystal cell 30, the projection of the first alignment mark 409 in the cholesteric liquid crystal cell 30 coincides with the corresponding second alignment mark 311. By setting at least one first alignment mark 409 and at least one second alignment mark 311, when the projection of the first alignment mark 409 in the cholesteric liquid crystal cell 30 coincides with the corresponding second alignment mark 311, the cholesteric liquid crystal cell 30 can be arranged on one side of the white pixel in the display unit 40, so that the cholesteric liquid crystal cell 30 can reflect light of different colors, thereby improving the problem of color fading caused by white light passing through the white pixel, and further ensuring that the display effect of the liquid crystal display panel is good.

[0067] Specifically, the surfaces of the display unit and the cholesteric liquid crystal cell further comprise a transparent conductive film layer, and the first alignment mark 409 and the second alignment mark 311 are obtained by photolithography on the transparent conductive film layer.

[0068] In a specific embodiment, the shapes of the first alignment mark 409 and the second alignment mark 311 are not limited to the "cross" shape described above, and can be any one of a quadrilateral, a pentagram, a heptagram, etc. However, the shapes of the corresponding first alignment mark 409 and the second alignment mark 311 need to be the same, so that the cholesteric liquid crystal cell 30 can be arranged at the position of the camera of the display unit 40, i.e., the same shape can achieve complete alignment. The specific shapes of the first alignment mark 409 and the second alignment mark 311 are shown in FIG. 4. Figure 15 .

[0069] Of course, the number of the first alignment mark 409 and the second alignment mark 311 is not particularly limited, but the more the number is, the more complex the manufacturing process is. Preferably, the first alignment mark 409 and the second alignment mark 311 each comprise four, which are located in four directions.

[0070] Based on the same inventive concept, the embodiment of the present application also provides a display device, as shown in 16, the display device comprises a backlight panel 50, a light sensing element 60 and any one of the liquid crystal display panels 70, wherein the backlight panel 50 has a first through hole; the light sensing element 60 is located in the first through hole of the backlight panel 50, the light sensing element 60 comprises a camera element, and the camera element comprises a camera; the liquid crystal display panel 70 is located on one side of the backlight panel. The cholesteric liquid crystal unit 30 in the liquid crystal display panel 70 corresponds to the area of the camera.

[0071] The display device described above, by setting the cholesteric liquid crystal unit on one side of the display unit, the cholesteric liquid crystal unit corresponds to the area of the light sensing element, and because the cholesteric liquid crystal unit has the light reflection state and the light transmission state, in the case that the light sensing element is turned on, by controlling the cholesteric liquid crystal unit to be in the light transmission state, the cholesteric liquid crystal unit can transmit more light, ensuring that the photographing effect of the light sensing element is good, and in the case that the light sensing element is turned off, by controlling the cholesteric liquid crystal unit to be in the light reflection state, the cholesteric liquid crystal unit is used for reflecting at least one monochromatic light, avoiding the problem that the display screen is colorless in the prior art due to the white light transmitted by the white pixel, solving the problem that the uniformity of the display screen is poor in the prior art due to the difference in pixel composition of the camera, and ensuring that the display effect of the liquid crystal display panel is good.

[0072] Specifically, the camera uses an under-screen camera technology, that is, the camera is completely built-in under the liquid crystal display panel, and the liquid crystal display panel is no longer a notch screen or a water drop screen, but realizes a real full-screen.

[0073] In addition, as shown in Figure 16 The liquid crystal display panel 70 in the display device further comprises a display unit 40, and the display unit 40 is located on at least the surface of the cholesteric liquid crystal unit 30 close to the light sensing element 60.

[0074] The embodiment of the present application also provides a driving method of the display device.

[0075] Figure 17 is a flow chart of the driving method of the display device according to the embodiment of the present application. As shown in Figure 17 The driving method comprises the following steps:

[0076] S1701, in the case that a photographing request is received, controlling the cholesteric liquid crystal unit to be in the light transmission state;

[0077] Specifically, in the case of receiving the above-mentioned photographing request, by powering the above-mentioned cholesteric liquid crystal unit, the liquid crystal molecules in the above-mentioned cholesteric liquid crystal unit are in a vertical state, at this time, the above-mentioned cholesteric liquid crystal unit is in a full transmission state, that is, the above-mentioned light transmission state.

[0078] S1702, in the case of not receiving the above-mentioned photographing request, control the above-mentioned cholesteric liquid crystal unit to be in a reflective state.

[0079] Specifically, in the case of not receiving the above-mentioned photographing request, by controlling the above-mentioned cholesteric liquid crystal unit not to be powered, the liquid crystal molecules in the above-mentioned cholesteric liquid crystal unit are in a horizontal state, and the cholesteric liquid crystal presents a certain period of helical structure, at this time, the above-mentioned cholesteric liquid crystal unit is in a reflective state, that is, the above-mentioned light reflection state, and when the above-mentioned cholesteric liquid crystal unit is in a light transmission state, the helical structure of the above-mentioned cholesteric liquid crystal disappears.

[0080] The driving method of the above-mentioned display device, first, in the case of receiving the above-mentioned photographing request, by controlling the above-mentioned cholesteric liquid crystal unit to be in a light transmission state; then, in the case of not receiving the above-mentioned photographing request, by controlling the above-mentioned cholesteric liquid crystal unit to be in a light reflection state. It is ensured that the above-mentioned cholesteric liquid crystal unit can control the state of the above-mentioned cholesteric liquid crystal unit according to whether to take a picture, in the case of receiving the photographing request, by controlling the above-mentioned cholesteric liquid crystal unit to be in a light transmission state, it is ensured that the above-mentioned cholesteric liquid crystal unit can transmit more light, thereby ensuring that the photographing effect of the camera is good, and in the case of no photographing request, by controlling the above-mentioned cholesteric liquid crystal unit to be in a light reflection state, the above-mentioned cholesteric liquid crystal unit can reflect at least one monochromatic light, solving the problem that the display picture is too light due to the white pixel transmitting white light in the prior art, and ensuring that the display effect of the above-mentioned liquid crystal display panel is good.

[0081] Specifically, in the case of receiving the photographing request, not only the above-mentioned cholesteric liquid crystal unit is in a light transmission state, but also the above-mentioned white pixel is in a light transmission state, so that white light can be transmitted through the above-mentioned white pixel, further ensuring that the photographing effect is good, and in the case of not receiving the photographing request, the above-mentioned cholesteric liquid crystal unit is in a reflective state, at the same time, the above-mentioned white pixel can be in a light transmission state or a non-light transmission state, which is determined according to actual application.

[0082] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid crystal display panel, characterized in that, include: A cholesteric liquid crystal cell, wherein the dimming pixel region includes cholesteric liquid crystal, the dimming pixel region having a reflective state and a transparent state, wherein in the reflective state, the dimming pixel region is used to reflect at least one monochromatic light; The display unit is located on one side of the cholesteric liquid crystal unit. The display unit includes a first display area and a second display area. The first display area includes a plurality of display sub-areas, each of which includes a first color pixel and a white pixel. The second display area surrounds the outer periphery of the first display area. The cholesteric liquid crystal unit includes a plurality of dimming pixel areas. Each dimming pixel area corresponds to a white pixel. The orthographic projection of the dimming pixel area onto the plane of the light-emitting surface coincides with the orthographic projection of the white pixel onto the plane of the light-emitting surface.

2. The liquid crystal display panel according to claim 1, characterized in that, Each of the dimming pixel regions comprises at least two dimming sub-pixel regions, wherein the dimming sub-pixel regions reflect light of different colors.

3. The liquid crystal display panel according to claim 2, characterized in that, The dimming sub-pixel region includes a first dimming sub-pixel region, a second dimming sub-pixel region, and a third dimming sub-pixel region. The first dimming sub-pixel region is used to reflect red light, the second dimming sub-pixel region is used to reflect green light, and the third dimming sub-pixel region is used to reflect blue light.

4. The liquid crystal display panel according to claim 3, characterized in that, The first, second, and third photodiode pixel regions all contain the same chiral agent, and the chiral agent content in the first, second, and third photodiode pixel regions increases sequentially.

5. The liquid crystal display panel according to claim 3, characterized in that, The first color pixel includes three sub-pixels, namely a red sub-pixel, a blue sub-pixel, and a green sub-pixel. The orthographic projection area of ​​the dimming sub-pixel region on the white pixel corresponds one-to-one with the sub-pixel, and the light emitted by the sub-pixel is the same color as the light reflected by the dimming sub-pixel region corresponding to the orthographic projection area.

6. The liquid crystal display panel according to claim 5, characterized in that, The display sub-region includes a first color pixel and a white pixel located on one side of the first color pixel in a first direction. Three sub-pixels in the first color pixel are distributed along a second direction, which is perpendicular to the first direction. The three dimming sub-pixel regions are arranged along the second direction as three orthogonal projection regions on the white pixel.

7. The liquid crystal display panel according to claim 1, characterized in that, The cholesteric liquid crystal cell further includes a first support substrate and at least two isolation structures located on the first support substrate. Two adjacent isolation structures and the first support substrate between the two isolation structures form the dimming pixel region. If the dimming pixel region includes at least two dimming sub-pixel regions, the two adjacent isolation structures form the dimming sub-pixel regions.

8. The liquid crystal display panel according to any one of claims 1 to 6, characterized in that, The cholesteric liquid crystal unit further includes a common electrode and a pixel electrode. The common electrode and the pixel electrode are located on opposite sides of the dimming pixel region in a third direction. When the dimming pixel region includes at least two dimming sub-pixel regions, there are multiple pixel electrodes, and each pixel electrode is located on one side of a dimming sub-pixel region. The third direction is the thickness direction of the cholesteric liquid crystal unit.

9. The liquid crystal display panel according to any one of claims 1 to 6, characterized in that, The display unit further includes at least one first alignment mark, and the cholesteric liquid crystal unit further includes at least one second alignment mark, wherein the projection of the first alignment mark in the cholesteric liquid crystal unit coincides with the corresponding second alignment mark.

10. A display device, characterized in that, include: A backlight panel having a first through hole; A photosensitive element is located within the first through-hole of the backlight panel; The liquid crystal display panel according to any one of claims 1 to 9, wherein the liquid crystal display panel is located on one side of the backlight panel.

11. A driving method for a display device according to claim 10, characterized in that, The driving method includes: Upon receiving a photo-taking request, the cholesteric liquid crystal unit is controlled to be in a light-transmitting state; If the photo-taking request is not received, the cholesteric liquid crystal unit is controlled to be in a reflective state.

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