Display device

Abstract

The utility model discloses a display device which comprises a display module which comprises a display face and a back face. The at least one liquid crystal box is stacked with the display module, and the at least one liquid crystal box is arranged on the back surface of the display module; the liquid crystal box comprises an array substrate, an opposite substrate opposite to the array substrate and a cholesteric liquid crystal layer arranged between the array substrate and the opposite substrate. Wherein in the thickness direction of the display device, the orthographic projection of the liquid crystal box and the orthographic projection of the display module are at least partially overlapped; and the display surface of the liquid crystal box is a surface deviating from the display module. According to the utility model, double-sided display of the display device can be realized with lower cost and power consumption.

Description

Technical Field

[0001] The utility model relates to the field of display technologies, and in particular, to a display device. Background Art

[0002] With the development of display technologies, display devices are more and more widely used, and correspondingly, the requirements for display devices are also getting higher and higher.

[0003] In related technologies, a display device can only display a picture on one side. Or, a display is added on the back to achieve double-sided display. However, the solution of adding a display on the back in related technologies has relatively high costs and power consumption. Summary of the Utility Model

[0004] The utility model provides a display device, so as to achieve double-sided display of the display device with relatively low costs and power consumption.

[0005] According to one aspect of the utility model, there is provided a display device, which comprises:

[0006] a display module, the display module comprising a display surface and a back surface;

[0007] at least one liquid crystal cell stacked with the display module, the at least one liquid crystal cell being disposed on the back surface of the display module; the liquid crystal cell comprises an array substrate, a counter substrate opposite to the array substrate, and a cholesteric liquid crystal layer disposed between the array substrate and the counter substrate; wherein, along the thickness direction of the display device, the orthographic projection of the liquid crystal cell at least partially overlaps with the orthographic projection of the display module; the display surface of the liquid crystal cell is the side facing away from the display module.

[0008] Optionally, the display module comprises a display panel and a light sensing module;

[0009] Along the thickness direction of the display device, the orthographic projection of the liquid crystal cell covers the orthographic projection of the display panel and the orthographic projection of the light sensing module.

[0010] Optionally, the display module comprises a display panel and a light sensing module;

[0011] Along the thickness direction of the display device, the orthographic projection of the liquid crystal cell covers the orthographic projection of the light sensing module; and along the thickness direction of the display device, the orthographic projection of the liquid crystal cell does not overlap with the display area of the display panel.

[0012] Optionally, the display module comprises a display panel and a light sensing module;

[0013] In the thickness direction of the display device, the orthographic projection of the liquid crystal cell covers the orthographic projection of the display panel; and in the thickness direction of the display device, the orthographic projection of the liquid crystal cell does not overlap with the orthographic projection of the light sensing module.

[0014] Optionally, the display panel is a liquid crystal display panel or a self-luminous display panel; the self-luminous display panel is an organic light emitting diode display panel, a micro light emitting diode display panel or a sub-millimeter light emitting diode display panel.

[0015] Optionally, the display device further includes a flexible circuit board, one end of the flexible circuit board is bonded to the liquid crystal cell, and the other end of the flexible circuit board is bonded to the display module.

[0016] Optionally, the at least one liquid crystal cell includes a first liquid crystal cell, the first liquid crystal cell includes a first array substrate, a first counter substrate opposite to the first array substrate, and a first cholesteric liquid crystal layer disposed between the first array substrate and the first counter substrate;

[0017] A plurality of first pixel electrodes are disposed on the first array substrate, and a first common electrode cooperating with the first pixel electrodes is disposed on the first counter substrate;

[0018] The first cholesteric liquid crystal layer is composed of a cholesteric liquid crystal that reflects a first color light, a cholesteric liquid crystal that reflects a second color light, and a cholesteric liquid crystal that reflects a third color light.

[0019] Optionally, the at least one liquid crystal cell is successively the second liquid crystal cell, the third liquid crystal cell, and the fourth liquid crystal cell away from the display module;

[0020] The second liquid crystal cell includes a second array substrate, a second counter substrate opposite to the second array substrate, and a second cholesteric liquid crystal layer disposed between the second array substrate and the second counter substrate; a plurality of second pixel electrodes are disposed on the second array substrate, and a second common electrode cooperating with the second pixel electrodes is disposed on the second counter substrate; the second cholesteric liquid crystal layer is configured to reflect the first color light in the reflective state;

[0021] The third liquid crystal cell includes a third array substrate, a third counter substrate opposite to the third array substrate, and a third cholesteric liquid crystal layer disposed between the third array substrate and the third counter substrate; a plurality of third pixel electrodes are disposed on the third array substrate, and a third common electrode cooperating with the third pixel electrodes is disposed on the third counter substrate; the third cholesteric liquid crystal layer is configured to reflect the second color light in the reflective state;

[0022] The fourth liquid crystal cell includes a fourth array substrate, a fourth counter substrate opposite to the fourth array substrate, and a fourth cholesteric liquid crystal layer disposed between the fourth array substrate and the fourth counter substrate; a plurality of fourth pixel electrodes are provided on the fourth array substrate, and a fourth common electrode cooperating with the fourth pixel electrodes is provided on the fourth counter substrate; the fourth cholesteric liquid crystal layer is configured to reflect the third color light in the reflective state;

[0023] Wherein, the first color light, the second color light, and the third color light are different from each other.

[0024] Optionally, the display device further includes an adhesive layer for bonding the display module and the liquid crystal cell adjacent to the display module.

[0025] Optionally, the display module further includes a rear cover, a display panel, and a light sensing module; the display panel and the light sensing module are disposed on one side of the rear cover close to the display surface of the display module;

[0026] The adhesive layer is bonded to the rear cover.

[0027] The technical solution of the embodiment of the present invention adopts a display device including a display module, and the display module includes a display surface and a back surface; at least one liquid crystal cell stacked with the display module, and at least one liquid crystal cell is disposed on the back surface of the display module; the liquid crystal cell includes an array substrate, a counter substrate opposite to the array substrate, and a cholesteric liquid crystal layer disposed between the array substrate and the counter substrate; wherein, along the thickness direction of the display device, the orthographic projection of the liquid crystal cell and the orthographic projection of the display module at least partially overlap; the display surface of the liquid crystal cell is the side facing away from the display module. By disposing the liquid crystal cell including the cholesteric liquid crystal layer on the back surface of the display module, the liquid crystal cell can display a static image or an image with a low refresh rate with low power consumption, and the liquid crystal cell has a low cost. Therefore, this embodiment can enable the display device to achieve double-sided display with low power consumption and cost, and make the back surface of the display device more beautiful.

[0028] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0030] Figure 1 Schematic structural diagram of a display device provided by an embodiment of the present utility model;

[0031] Figure 2 Top view of a liquid crystal cell provided by an embodiment of the present utility model;

[0032] Figure 3 Schematic circuit structure diagram of a liquid crystal cell provided by an embodiment of the present utility model;

[0033] Figure 4 For Figure 1 Schematic diagram of the display principle of the liquid crystal cell when the optical sensing module in does not work;

[0034] Figure 5 For Figure 1 Schematic diagram of the display effect of the liquid crystal cell when the optical sensing module in does not work;

[0035] Figure 6 For Figure 1 Schematic diagram of the display principle of the liquid crystal cell when the optical sensing module in works;

[0036] Figure 7 For Figure 1 Schematic diagram of the display effect of the liquid crystal cell when the optical sensing module in works;

[0037] Figure 8 Schematic diagram of the display principle of the liquid crystal cell when the optical sensing module in another display device of an embodiment of the present utility model does not work;

[0038] Figure 9 Schematic diagram of the display effect of the liquid crystal cell when the optical sensing module in another display device of an embodiment of the present utility model does not work;

[0039] Figure 10 Schematic diagram of the display principle of the liquid crystal cell when the optical sensing module in another display device of an embodiment of the present utility model works;

[0040] Figure 11 Schematic diagram of the display effect of the liquid crystal cell when the optical sensing module in another display device of an embodiment of the present utility model works;

[0041] Figure 12 Schematic structural diagram of yet another display device provided by an embodiment of the present utility model;

[0042] Figure 13 For Figure 12 Display effect diagram of the back of the display device of ;

[0043] Figure 14 Schematic structural diagram of yet another display device provided by an embodiment of the present utility model;

[0044] Figure 15 This is a schematic structural diagram of another display device provided by an embodiment of the present invention. Detailed implementation manners

[0045] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0047] Figure 1 This is a schematic structural diagram of a display device provided by an embodiment of the present invention, refer to Figure 1 . The display device includes: a display module 2, and the display module 2 includes a display surface and a back surface; at least one liquid crystal cell stacked with the display module 2, and the at least one liquid crystal cell is disposed on the back surface of the display module 2; the liquid crystal cell includes an array substrate, a counter substrate opposite to the array substrate, and a cholesteric liquid crystal layer disposed between the array substrate and the counter substrate; wherein, along the thickness direction of the display device, the orthographic projection of the liquid crystal cell and the orthographic projection of the display module 2 at least partially overlap; the display surface of the liquid crystal cell is the side facing away from the display module.

[0048] Specifically, the display device has a dual-sided display function. Among them, the display module 2 is for front display, that is, the display device 2 is the main display device. At least one liquid crystal cell is for back display, and can be used to display static images or pictures with a relatively low refresh rate (such as e-books), etc. In Figure 2Taking the example that at least one liquid crystal cell includes the first liquid crystal cell 1, wherein the array substrate of the first liquid crystal cell 1 is defined as the first array substrate 11, the counter substrate of the first liquid crystal cell 1 is defined as the first counter substrate 15, and the cholesteric liquid crystal layer of the first liquid crystal cell 1 is defined as the first cholesteric liquid crystal layer 13.

[0049] The liquid crystal cell in this embodiment includes a cholesteric liquid crystal layer, wherein the cholesteric liquid crystal layer is composed of cholesteric liquid crystal, such as cholesterol liquid crystal. Cholesteric liquid crystal has two stable textures, the P state (Planar, flat area structure state) and the FC state (Focal Conic, focal cone structure state), and neither of these two states requires voltage to maintain. The reflection spectrum of cholesteric liquid crystal in the P state is in the visible light spectrum range, and at this time, the cholesteric liquid crystal presents bright colors. When cholesteric liquid crystal is in the FC state, it no longer reflects the above-mentioned colored light, and the light is scattered and transmitted. And under the action of a certain electric field, the P state and the FC state of cholesteric liquid crystal can be converted into each other, and these two states can be maintained for a long time without voltage. For example, at zero voltage, when cholesteric liquid crystal is in the P state in the initial state, it is in the reflection state at this time, and the visible light spectra reflected by cholesteric liquid crystals with different arrangement directions are different, and the spectra other than the reflection spectrum can pass through the cholesteric liquid crystal. In addition, the reflection spectrum band (Δλ) of cholesteric liquid crystal is proportional to the pitch (Po) and the birefringence (Δn = ne - no) of the cholesteric liquid crystal material: Δλ = Po * Δn. When a voltage is applied across the cholesteric liquid crystal and then the voltage is slowly reduced to zero, the cholesteric liquid crystal molecules rotate and stop in the FC state, which is the scattering state. When a voltage is applied across the cholesteric liquid crystal, the cholesteric liquid crystal is in the H (Homeotropic, vertical alignment) state, which is the transparent state, and this state is unstable and requires voltage to maintain.

[0050] It can be seen that for static images or images with a low refresh rate, it is only necessary to apply an electric field to the cholesteric liquid crystal once before refreshing the image, and this electric field does not need to be maintained, so that the image can be displayed with lower power consumption. Among them, applying an electric field to the cholesteric liquid crystal can be achieved by driving the array substrate and the counter substrate. When voltages are applied to the corresponding electrodes on the array substrate and the counter substrate, the cholesteric liquid crystal is placed in the corresponding electric field, so as to reach the corresponding state. In addition, since the liquid crystal cell containing the cholesteric liquid crystal layer has a low cost, the display device can also achieve double-sided display at a low cost. Based on this, in this embodiment, on the back of the display device, static images or images with a low refresh rate can be displayed according to the user's needs, and it is also relatively convenient to replace the images, making the back of the display device more beautiful.

[0051] The technical solution of this embodiment adopts a display device including a display module, and the display module includes a display surface and a back surface; at least one liquid crystal cell stacked with the display module, and the at least one liquid crystal cell is disposed on the back surface of the display module; the liquid crystal cell includes an array substrate, a counter substrate opposite to the array substrate, and a cholesteric liquid crystal layer disposed between the array substrate and the counter substrate; wherein, along the thickness direction of the display device, the orthographic projection of the liquid crystal cell and the orthographic projection of the display module at least partially overlap; the display surface of the liquid crystal cell is the side facing away from the display module. By disposing the liquid crystal cell containing the cholesteric liquid crystal layer on the back surface of the display module, the liquid crystal cell can display a static picture or a picture with a low refresh rate with lower power consumption, and the liquid crystal cell has a lower cost. Therefore, this embodiment can enable the display device to achieve double-sided display with lower power consumption and cost. At the same time, it can also make the back surface of the display device more beautiful.

[0052] Optionally, Figure 2 is a top view of a liquid crystal cell provided by an embodiment of the present invention, Figure 3 is a schematic circuit structure diagram of a liquid crystal cell provided by an embodiment of the present invention, refer to Figure 2 and Figure 3 . Among them, Figure 2 can be understood as the overall top view of all liquid crystal cells. In the overall top view, there are a plurality of sub-pixels Px, and specifically, it may include a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel. The cholesteric liquid crystals corresponding to different color sub-pixels are different. For example, the pitch of the cholesteric liquid crystal may be different, so that the first color sub-pixel reflects light of the first color, the second color sub-pixel reflects light of the second color, and the third color sub-pixel reflects light of the third color. Among them, the first color sub-pixel may be a red sub-pixel R, the second color sub-pixel may be a green sub-pixel G, and the third color sub-pixel may be a blue sub-pixel B. Of course, this embodiment is not limited thereto. Such as Figure 1 and Figure 3As shown, a plurality of pixel electrodes are provided on the array substrate. In this embodiment, it is taken as an example that a plurality of first pixel electrodes 12 are provided on the first array substrate 11. Data lines DL and scan lines GL that intersect horizontally and vertically are also provided on the array substrate. The data lines DL and the scan lines DL are insulated and crossed to define the region where the sub-pixels Px are located. The sub-pixel Px includes a corresponding pixel electrode (taking the first pixel electrode 12 as an example in this embodiment), a control switch T1, a cholesteric liquid crystal, and a corresponding common electrode. A zero voltage or a fixed voltage can be applied to the common electrode. When it is necessary to change the state of the cholesteric liquid crystal in a certain sub-pixel Px, when there is a signal on the scan line GL corresponding to the sub-pixel Px, the control switch T1 corresponding to the sub-pixel Px is turned on. At this time, a voltage is applied to the pixel electrode of the sub-pixel Px through the data line DL, so that there is an electric field at both ends of the cholesteric liquid crystal, and then the voltage is gradually reduced to 0V, and the state of the cholesteric liquid crystal changes. It can be seen that the control method and circuit structure of the liquid crystal cell in this embodiment are also relatively simple, making the costs of fabricating and driving the liquid crystal cell relatively low.

[0053] Optionally, referring to Figure 1 , the display module 2 includes a display panel 21 and a light sensing module 28; along the thickness direction of the display device, the orthographic projection of the liquid crystal cell covers the orthographic projection of the display panel 21 and the orthographic projection of the light sensing module 28.

[0054] Specifically, in some embodiments, along the thickness direction of the display device, the orthographic projection of the display panel 21 does not overlap with the orthographic projection of the light sensing module 28. For example, a hole can be dug in the display panel 21 so that the display panel partially or completely surrounds the light sensing module 28. In some other embodiments, along the thickness direction of the display device, the orthographic projection of the light sensing module 28 at least partially overlaps with the orthographic projection of the display panel 21. At this time, the light sensing module 28 can be disposed on the back surface of the display panel 21.

[0055] The light sensing module 28 can be a camera for collecting visible light, or an infrared sensor for collecting infrared light, etc. The viewing field of the light sensing module 28 faces the back surface of the display module 2. In the related art, the display on the back surface of the display device needs to avoid blocking the light sensing module 28, which thus makes it impossible to achieve the full-screen display effect for the display on the back surface. In this embodiment, the display on the back surface of the display device is a liquid crystal cell including a cholesteric liquid crystal layer. Since the cholesteric liquid crystal has two states, a reflective state and a scattering state, an image can be displayed in the reflective state, and external light can penetrate the liquid crystal in the scattering state. In this embodiment, the orthographic projection of the liquid crystal cell covers the orthographic projection of the display panel 21 and the orthographic projection of the light sensing module 28, that is to say, the liquid crystal cell entirely covers the back surface of the display module, so that the back surface of the display device can achieve the full-screen display function.

[0056] Such as Figures 4 to 7As shown Figure 4 is Figure 1 a schematic diagram of the display principle of the liquid crystal cell when the optical sensing module is not working, Figure 5 is Figure 1 a schematic diagram of the display effect of the liquid crystal cell when the optical sensing module is not working, Figure 6 is Figure 1 a schematic diagram of the display principle of the liquid crystal cell when the optical sensing module is working, Figure 7 is Figure 1 a schematic diagram of the display effect of the liquid crystal cell when the optical sensing module is working. Among them, in this embodiment, the optical sensing module 28 and the display panel 21 do not overlap. In this embodiment, the display module includes a display area AA and an image acquisition area CA at least partially surrounded by the display area AA. The display panel 21 is disposed in the display area AA, and the optical sensing module 28 is disposed in the image acquisition area CA. The ambient light incident on the liquid crystal cell from the back of the display device is defined as the external ambient light Lw. When a picture needs to be displayed, the cholesteric liquid crystals in different sub-pixels have corresponding reflective or scattering states. As Figure 4 shown, when the cholesteric liquid crystal in the red sub-pixel is in the reflective state, the red light Lr is reflected, and other color lights pass through, so that the red sub-pixel presents red. When the cholesteric liquid crystal in the green sub-pixel is in the reflective state, the green light Lg is reflected, and other color lights pass through, so that the green sub-pixel presents green. When the cholesteric liquid crystal in the blue sub-pixel is in the reflective state, the blue light Lb is reflected, and other color lights pass through, so that the blue sub-pixel presents blue. For the sub-pixels in the scattering state, all lights will pass through, so there is no reflected light, and the sub-pixel presents black. Thus, the states of the cholesteric liquid crystals in each sub-pixel can be controlled to enable the liquid crystal cell to achieve color display. As Figure 4 and Figure 5 shown, at this time, the part of the liquid crystal cell corresponding to the image acquisition area CA and the part of the liquid crystal cell corresponding to the display area AA jointly display a picture, so as not to damage the integrity of the display picture. Of course, it should be noted that the cholesteric liquid crystal can also be made to achieve different degrees of reflection or scattering by controlling the voltage magnitude at both ends of the cholesteric liquid crystal.

[0057] As Figure 6 shown, when an image needs to be acquired, that is, when the optical sensing module 28 needs to work, the sub-pixels in the part of the liquid crystal cell corresponding to the image acquisition area CA are controlled to be in the scattering state, so that the external ambient light can enter the optical sensing module 28. And the part of the liquid crystal cell corresponding to the display area AA can be normally displayed as needed. As Figure 7As shown, at this time, the part of the liquid crystal cell corresponding to the image acquisition area CA is not displayed, and the part of the liquid crystal cell corresponding to the display area AA is independently displayed, so as not to affect the image acquisition by the optical sensing module 28. In this embodiment, when image acquisition is not required, the liquid crystal cell can display an image as a whole, and the back of the display device is more beautiful. When image acquisition is required, the part of the liquid crystal cell corresponding to the image acquisition area CA is not displayed, so as to avoid affecting the image acquisition effect. It should be noted that the part of the liquid crystal cell corresponding to the image acquisition area CA is the part in the liquid crystal cell whose orthographic projection is located in the image acquisition area CA along the thickness direction of the display device; similarly, the part of the liquid crystal cell corresponding to the display area AA is the part in the liquid crystal cell whose orthographic projection is located in the display area AA along the thickness direction of the display device.

[0058] In some other embodiments, optionally, as Figures 8 to 11 shown, Figure 8 is a schematic diagram of the display principle of the liquid crystal cell when the optical sensing module does not work in another display device according to an embodiment of the present invention, Figure 9 is a schematic diagram of the display effect of the liquid crystal cell when the optical sensing module does not work in another display device according to an embodiment of the present invention, Figure 10 is a schematic diagram of the display principle of the liquid crystal cell when the optical sensing module works in another display device according to an embodiment of the present invention, Figure 11 is a schematic diagram of the display effect of the liquid crystal cell when the optical sensing module works in another display device according to an embodiment of the present invention. Different from the embodiment shown in Figure 1 , in this embodiment, along the thickness direction of the display device, the orthographic projection of the liquid crystal cell covers the orthographic projection of the display panel 21; and along the thickness direction of the display device, the orthographic projection of the liquid crystal cell does not overlap with the orthographic projection of the optical sensing module. That is to say, the liquid crystal cell is only provided corresponding to the image acquisition area CA. When image acquisition is not required, that is, when the optical sensing module 28 does not work, the states of each sub-pixel of the liquid crystal cell can be set at this time, so that the color displayed by the liquid crystal cell is the same as or close to the color of the back of the display module 2, and thus, as shown in Figure 9 , the overall display effect of the back of the display device is better and more beautiful. When image acquisition is required, that is, when the optical sensing module works, as shown in Figure 10 , at this time, the cholesteric liquid crystal in the liquid crystal cell is controlled to be in a scattering state, so that ambient light can pass through the liquid crystal cell and enter the optical sensing module 28, and the effect presented on the back of the display device is as shown in Figure 11 , at this time, the color of the liquid crystal cell is different from the color of the back of the display module.

[0059] It should be noted that in the above embodiments, when the optical sensing module 28 needs to work, the part of the liquid crystal cell corresponding to the image acquisition area CA can also be controlled to be in the H state, so that the image quality collected by the optical sensing module 28 is higher.

[0060] In some other embodiments, optionally, Figure 12 FIG. 2 is a schematic structural diagram of another display device provided by an embodiment of the present invention. Different from the above embodiments, in this embodiment, along the thickness direction of the display device, the orthographic projection of the liquid crystal cell covers the orthographic projection of the display panel 21; and along the thickness direction of the display device, the orthographic projection of the liquid crystal cell does not overlap with the orthographic projection of the light sensing module 28.

[0061] Specifically, in this embodiment, the liquid crystal cell only corresponds to the display area AA, and there is no corresponding liquid crystal cell in the image acquisition area CA. As Figure 13 shown, Figure 13 FIG. 3 Figure 12 is a display effect diagram on the back of the display device. Since there is no liquid crystal cell in the image acquisition area CA, the sensing effect of the light sensing module 28 will not be affected. There is a liquid crystal cell in the display area, and the liquid crystal cell can display corresponding images according to the needs of users, making the back of the display device more beautiful.

[0062] Optionally, referring to Figures 1 to 12 FIG. 1, in the above embodiments, at least one liquid crystal cell includes the first liquid crystal cell 1 as an example. The first liquid crystal cell 1 includes a first array substrate 11, a first counter substrate 15 opposite to the first array substrate 11, and a first cholesteric liquid crystal layer 13 disposed between the first array substrate 11 and the first counter substrate 15; a plurality of first pixel electrodes 12 are disposed on the first array substrate 11, and a first common electrode 14 cooperating with the first pixel electrodes 12 is disposed on the first counter substrate 15. The first cholesteric liquid crystal layer 13 is composed of cholesteric liquid crystals that reflect the first color light, cholesteric liquid crystals that reflect the second color light, and cholesteric liquid crystals that reflect the third color light.

[0063] Specifically, in this embodiment, the first liquid crystal cell 1 contains three different types of cholesteric liquid crystals. Each first pixel electrode 12 corresponds to a sub-pixel, and the first liquid crystal cell includes three types of sub-pixels: sub-pixels that display the first color, sub-pixels that display the second color, and sub-pixels that display the third color. The sub-pixels that display the first color include cholesteric liquid crystals that reflect the first color light, the sub-pixels that display the second color include cholesteric liquid crystals that reflect the second color light, and the sub-pixels that display the third color include cholesteric liquid crystals that reflect the third color light. The cholesteric liquid crystals corresponding to different color sub-pixels can be separated by a dam 16. Or, in some other embodiments, different photopolymerizable polymers can also be added to the cholesteric liquid crystals corresponding to different color sub-pixels, such as irradiating the polymer with UV light to fix different pitches. In this embodiment, full-color display can be achieved by using one liquid crystal cell, and the overall thickness of the display device is relatively small.

[0064] In some other embodiments, as Figure 14 shown in Figure 14A schematic structural diagram of another display device provided by an embodiment of the present invention. Different from the embodiment shown in Figures 1 to 12 , at least one liquid crystal cell in this embodiment is not a single-layer liquid crystal cell, but includes a second liquid crystal cell 4, a third liquid crystal cell 5, and a fourth liquid crystal cell 6 that are successively away from the display module 2. Among them, the second liquid crystal cell 4 includes a second array substrate 41, a second counter substrate 45 opposite to the second array substrate 41, and a second cholesteric liquid crystal layer 43 disposed between the second array substrate and the second counter substrate; a plurality of second pixel electrodes 42 are disposed on the second array substrate 41, and a second common electrode 44 that cooperates with the second pixel electrodes 42 is disposed on the second counter substrate 45; the second cholesteric liquid crystal layer 43 is used to reflect the first color light in the reflective state;

[0065] The third liquid crystal cell 5 includes a third array substrate 51, a third counter substrate 55 opposite to the third array substrate 51, and a third cholesteric liquid crystal layer 53 disposed between the third array substrate 51 and the third counter substrate 55; a plurality of third pixel electrodes 52 are disposed on the third array substrate 51, and a third common electrode 54 that cooperates with the third pixel electrodes 52 is disposed on the third counter substrate 55; the third cholesteric liquid crystal layer 53 is used to reflect the second color light in the reflective state;

[0066] The fourth liquid crystal cell 6 includes a fourth array substrate 61, a fourth counter substrate 65 opposite to the fourth array substrate 61, and a fourth cholesteric liquid crystal layer 63 disposed between the fourth array substrate 61 and the fourth counter substrate 65; a plurality of fourth pixel electrodes 62 are disposed on the fourth array substrate 61, and a fourth common electrode 64 that cooperates with the fourth pixel electrodes 62 is disposed on the fourth counter substrate 65; the fourth cholesteric liquid crystal layer 63 is used to reflect the third color light in the reflective state;

[0067] Among them, the first color light, the second color light, and the third color light are all selected from red light, green light, and blue light, and the first color light, the second color light, and the third color light are different from each other.

[0068] Specifically, in this embodiment, all cholesteric liquid crystals in the same liquid crystal cell reflect the same color of light in the reflective state, and the manufacturing cost of each liquid crystal cell is relatively low, and the yield is relatively high compared with setting a variety of different cholesteric liquid crystals in the same liquid crystal cell.

[0069] Optionally, the first color may be red, the second color may be green, and the third color may be blue. Of course, this embodiment is not limited thereto.

[0070] It should be noted that in the above embodiments, although the array substrate in each liquid crystal cell is away from the display module and the counter substrate is close to the display module as an example. However, this embodiment is not limited thereto, and it may also be that the array substrate is close to the display module and the counter substrate is away from the display module.

[0071] Optionally, the sub-pixels in the second liquid crystal cell 4, the third liquid crystal cell 5, and the fourth liquid crystal cell 6 are aligned with each other, so that the display device can display the first color, the second color, or the third color at the position of each sub-pixel in the corresponding liquid crystal cell, that is, the position of each sub-pixel can form a pixel (including at least one sub-pixel displaying the first color, at least one sub-pixel displaying the second color, and at least one sub-pixel displaying the third color), thereby improving the pixel resolution.

[0072] Optionally, the adjacent substrates (the substrates include the counter substrate and the array substrate) in two adjacent liquid crystal cells can be shared, thereby reducing the overall thickness of the display device.

[0073] Optionally, the above-mentioned array substrates and counter substrates can include materials such as glass, acrylic, or polycarbonate. Each pixel electrode and each common electrode can include indium tin oxide or indium zinc oxide, etc.

[0074] Optionally, the display panel is a liquid crystal display panel or a self-luminous display panel, and the self-luminous display panel is an organic light-emitting diode display panel, a micro light-emitting diode display panel, or a sub-millimeter light-emitting diode display panel.

[0075] Specifically, in this embodiment, the liquid crystal display panel is taken as an example for illustration. As Figures 1 to 12 shown, the liquid crystal display panel includes a liquid crystal array substrate 211, a liquid crystal layer 213, and a color filter substrate 217 that are successively close to the display surface of the display module. Among them, pixel electrodes 212 are provided on the liquid crystal array substrate 211, and the pixel electrodes 212 can be slit electrodes having a plurality of electrode strips. Color resistors 215 are provided on the color filter substrate 217, and a black matrix 216 is provided between adjacent color resistors 215. A liquid crystal common electrode 214 is further provided between the color resistor 215 and the liquid crystal layer 213, and the liquid crystal common electrode 214 is a planar electrode. When the display panel 21 is a liquid crystal display panel, the display module further includes a backlight module 22, and the backlight module 22 is disposed on one side of the display panel 21 close to the liquid crystal cell (the side far from the display panel of the display module 2), and the backlight module 22 is used to emit backlight to the display panel 21. The specific display principle of the liquid crystal display panel is well known to those skilled in the art and will not be elaborated here.

[0076] Optionally, the display module 2 further includes a battery 23, and the battery 23 is used to supply power to the display panel 21, and the battery 23 is disposed on one side of the display panel 21 close to the liquid crystal cell.

[0077] Optionally, the display module 2 further includes a touch control module 26, and the touch control module 26 is adhered to the light-emitting surface of the display panel 21 through an optical adhesive layer 25, and the touch control module 26 is used to implement the touch control function.

[0078] Optionally, the display module 2 further includes a cover plate 27, which is disposed on the side of the touch control module 26 away from the display panel 21. The cover plate 27 can be, for example, a glass cover plate for protecting the internal structure of the display module (such as the touch control module, the optical sensing module 28, and the display panel, etc.).

[0079] Optionally, Figure 15 is a schematic structural diagram of another display device provided by an embodiment of the present invention. Refer to Figure 15 . The display device further includes a flexible circuit board 71. One end of the flexible circuit board 71 is bonded to the liquid crystal cell, and the other end of the flexible circuit board 71 is bonded to the display module 2.

[0080] Specifically, the flexible circuit board 71 is used to provide various driving signals and data signals required for display to the liquid crystal cell. One end of the flexible circuit board 71 is bonded to the liquid crystal cell closest to the display module in at least one liquid crystal cell, and is bonded to the substrate closest to the display module in the array substrate and the counter substrate of the liquid crystal cell (the first counter substrate 15 in this embodiment), thereby reducing the size of the flexible circuit board 71. The other end of the flexible circuit board 71 can be bonded to the main board (not shown) of the display module 2. The liquid crystal cell is controlled to display through the main board of the display module.

[0081] Optionally, when at least one liquid crystal cell includes at least two liquid crystal cells, a flexible circuit board can be provided corresponding to each liquid crystal cell, and all the flexible circuit boards are bonded to the display module. It is also possible to first electrically connect all the liquid crystal cells in sequence, and only need to bond the flexible circuit board on the liquid crystal cell closest to the display module, thereby reducing the number of flexible circuit boards.

[0082] Optionally, refer to Figures 1 to 15 . The display device further includes an adhesive layer 3, and the adhesive layer 3 is used to bond the display module 2 and the liquid crystal cell close to the display module 2. The adhesive layer 3 can be, for example, an optical adhesive. The liquid crystal cell and the display module 2 are bonded through the optical adhesive, thereby preventing the liquid crystal cell from falling off the display module. Optionally, when at least one liquid crystal cell includes at least two liquid crystal cells, adjacent two liquid crystal cells can also be bonded through the optical adhesive.

[0083] Optionally, continue to refer to Figures 1 to 15 . The display module 2 further includes a rear cover 24, a display panel 21, and an optical sensing module 28; the display panel 21 and the optical sensing module 28 are disposed on the display surface side of the rear cover 24 close to the display module; the adhesive layer 3 is bonded to the rear cover 24.

[0084] Specifically, the rear cover 24 is used to protect devices such as the display panel 21 and the optical sensing module 28. When the liquid crystal cell is provided with a flexible circuit board 71 correspondingly, an opening can be made on the rear cover 27, and the flexible circuit board 71 passes through the opening of the rear cover 27 and is then bonded inside the display module 2.

[0085] It should be understood that the various forms of processes shown above can be used, with steps reordered, added or deleted. For example, the steps described in the present utility model can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present utility model can be achieved, and no limitation is imposed herein.

[0086] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A display device, characterized in that: The display device comprises: A display module, the display module comprising a display surface and a back surface; At least one liquid crystal box stacked with the display module, the at least one liquid crystal box is arranged on the back side of the display module; the liquid crystal box includes an array substrate, an opposing substrate opposite to the array substrate, and a cholesteric liquid crystal layer arranged between the array substrate and the opposing substrate; wherein, along the thickness direction of the display device, the orthographic projection of the liquid crystal box at least partially overlaps with the orthographic projection of the display module; the display surface of the liquid crystal box is the side away from the display module.

2. The display device according to claim 1, characterized in that The display module includes a display panel and a light sensor module; Along the thickness direction of the display device, the orthographic projection of the liquid crystal box covers the orthographic projection of the display panel and the orthographic projection of the light sensing module.

3. The display device according to claim 1, characterized in that The display module includes a display panel and a light sensing module; Along the thickness direction of the display device, the orthographic projection of the liquid crystal box covers the orthographic projection of the light sensing module; and along the thickness direction of the display device, the orthographic projection of the liquid crystal box does not overlap with the display area of ​​the display panel.

4. The display device according to claim 1, characterized in that The display module includes a display panel and a light sensing module; Along the thickness direction of the display device, the orthographic projection of the liquid crystal box covers the orthographic projection of the display panel; and along the thickness direction of the display device, the orthographic projection of the liquid crystal box does not overlap with the orthographic projection of the light sensing module.

5. The display device according to any one of claims 2 to 4, characterized in that: The display panel is a liquid crystal display panel or a self-luminous display panel; the self-luminous display panel is an organic light emitting diode display panel, a micron light emitting diode display panel or a sub-millimeter light emitting diode display panel.

6. The display device according to claim 1, characterized in that: The display device further includes a flexible circuit board, one end of which is bound to the liquid crystal box, and the other end of which is bound to the display module.

7. The display device according to claim 1, characterized in that: The at least one liquid crystal cell comprises a first liquid crystal cell, wherein the first liquid crystal cell comprises a first array substrate, a first opposing substrate opposite to the first array substrate, and a first cholesteric liquid crystal layer disposed between the first array substrate and the first opposing substrate; A plurality of first pixel electrodes are disposed on the first array substrate, and a first common electrode matched with the first pixel electrodes is disposed on the first opposing substrate; The first cholesteric liquid crystal layer is composed of a cholesteric liquid crystal reflecting a first color light, a cholesteric liquid crystal reflecting a second color light, and a cholesteric liquid crystal reflecting a third color light; The first liquid crystal box includes three different types of cholesteric liquid crystals; each first pixel electrode corresponds to a sub-pixel, and the first liquid crystal box includes three sub-pixels, namely, a sub-pixel displaying a first color, a sub-pixel displaying a second color, and a sub-pixel displaying a third color; the sub-pixel displaying the first color includes a cholesteric liquid crystal reflecting the first color light, the sub-pixel displaying the second color includes a cholesteric liquid crystal reflecting the second color light, and the sub-pixel displaying the third color includes a cholesteric liquid crystal reflecting the third color light.

8. The display device according to claim 1, characterized in that: The at least one liquid crystal cell is sequentially away from a second liquid crystal cell, a third liquid crystal cell and a fourth liquid crystal cell of the display module; The second liquid crystal box includes a second array substrate, a second opposing substrate opposite to the second array substrate, and a second cholesteric liquid crystal layer arranged between the second array substrate and the second opposing substrate; a plurality of second pixel electrodes are arranged on the second array substrate, and a second common electrode matched with the second pixel electrodes is arranged on the second opposing substrate; the second cholesteric liquid crystal layer is used to reflect the first color light in the reflection state; The third liquid crystal box comprises a third array substrate, a third opposing substrate opposite to the third array substrate, and a third cholesteric liquid crystal layer disposed between the third array substrate and the third opposing substrate; a plurality of third pixel electrodes are disposed on the third array substrate, and a third common electrode matched with the third pixel electrodes is disposed on the third opposing substrate; the third cholesteric liquid crystal layer is used to reflect the second color light in a reflective state; The fourth liquid crystal box comprises a fourth array substrate, a fourth opposing substrate opposite to the fourth array substrate, and a fourth cholesteric liquid crystal layer disposed between the fourth array substrate and the fourth opposing substrate; a plurality of fourth pixel electrodes are disposed on the fourth array substrate, and a fourth common electrode matched with the fourth pixel electrodes is disposed on the fourth opposing substrate; the fourth cholesteric liquid crystal layer is used to reflect a third color light in a reflective state; The first color light, the second color light and the third color light are different from each other.

9. The display device according to claim 1, characterized in that: The display device further comprises an adhesive layer, and the adhesive layer is used for bonding the display module and the liquid crystal box close to the display module.

10. The display device according to claim 9, characterized in that: The display module further comprises a back cover, a display panel and a light sensor module; the display panel and the light sensor module are arranged on a side of the back cover close to the display surface of the display module; The adhesive layer is adhered to the back cover.

Images