CN112327529A

CN112327529A - Display device and method for driving display device

Info

Publication number: CN112327529A
Application number: CN202011381033.7A
Authority: CN
Inventors: 李征
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-02-05
Anticipated expiration: 2040-11-30
Also published as: CN112327529B

Abstract

The invention discloses a display device and a driving method of the display device. The display device includes: a display panel including a display area including a plurality of display units; and a backlight module, the backlight module including: a light source assembly; a light guide plate; and a light control layer located between the light guide plate and the display panel, the light control layer including a substrate and a plurality of light control units located on the substrate, an orthographic projection of each light control unit on the display panel covering a corresponding display unit, each light control unit including a first electrode, a second electrode and an electrically controlled polarization structure, the electrically controlled polarization structure being connected between the first electrode and the second electrode, the light control unit being configured to: when the voltage difference between the first electrode and the second electrode is greater than or equal to the threshold voltage, the electrically-controlled polarization structure absorbs the first polarized light and enables the second polarized light to pass through, and the polarization direction of the first polarized light is perpendicular to that of the second polarized light. The display device provided by the embodiment of the invention has higher dynamic contrast.

Description

Display device and method for driving display device

Technical Field

The invention relates to the field of display, in particular to a display device and a driving method of the display device.

Background

Liquid Crystal Display (LCD) devices are currently the most widely used Display technology because of their mature technology and high reliability. An LCD is a type of backlight display device that utilizes modulation of backlight light when displaying an image.

Because the LCD modulates light of each sub-pixel region based on a uniform backlight light source, the contrast ratio of the LCD is often lower compared with some self-luminous display panels. Therefore, a high dynamic contrast technique applied to the LCD is desired.

Disclosure of Invention

The invention provides a display device and a driving method thereof, which realize the partition adjustment of backlight light so as to realize the high dynamic contrast of the display device.

In one aspect, an embodiment of the present invention provides a display device, including: a display panel including a display area including a plurality of display units; and a backlight module, the display panel is arranged at the light-emitting side of the backlight module, wherein the backlight module comprises: a light source assembly; the light guide plate comprises a light inlet surface facing the light source assembly and a light outlet surface facing the display panel, and can guide the light rays of the light source assembly received by the light inlet surface into the light rays irradiated from the light outlet surface to the display panel; and a light control layer located between the light guide plate and the display panel, the light control layer including a substrate and a plurality of light control units located on the substrate, an orthographic projection of each light control unit on the display panel covering a corresponding display unit, each light control unit including a first electrode, a second electrode and an electrically controlled polarization structure, the electrically controlled polarization structure being connected between the first electrode and the second electrode, the light control unit being configured to: when the voltage difference between the first electrode and the second electrode is smaller than the threshold voltage, the electric control polarization structure enables the first polarized light and the second polarized light to pass through; when the voltage difference between the first electrode and the second electrode is greater than or equal to the threshold voltage, the electrically-controlled polarization structure absorbs the first polarized light and enables the second polarized light to pass through, and the polarization direction of the first polarized light is perpendicular to that of the second polarized light.

In another aspect, an embodiment of the present invention provides a driving method of a display device, the driving method being used for driving the display device according to any one of the foregoing embodiments, the driving method including: sending gray scale information to each display unit of the display panel according to the received frame picture information; and sending light control information to each light control unit of the light control layer according to the gray scale information of each display unit of the display panel, wherein the light control unit controls the voltage difference between the first electrode and the second electrode according to the received light control information so as to control whether the electric control polarization structure absorbs the first polarized light.

According to the display device provided by the embodiment of the invention, the backlight module comprises the light control layer, the light control layer is positioned between the light guide plate and the display panel and comprises a plurality of light control units, and each light control unit comprises a first electrode, a second electrode and an electric control polarization structure connected between the first electrode and the second electrode. By controlling the voltage difference between the first electrode and the second electrode, whether the electrically-controlled polarizing structure allows the first polarized light to pass through can be controlled. Therefore, each light control unit can independently control the backlight brightness irradiating the display panel, and the orthographic projection of each light control unit on the display panel covers a corresponding display unit, so that on one hand, the backlight brightness of each display unit can be independently controlled, and the display device has higher dynamic contrast; on the other hand, the basic unit of backlight brightness control, namely the light control unit, corresponds to the display unit one by one, and compared with the prior art, the fineness of backlight brightness control can be improved. In addition, the display device of the embodiment of the invention greatly reduces the requirements on the structural form of the light source component of the backlight module on the premise of realizing backlight partition brightness adjustment, namely, the backlight partition brightness control taking the light control unit or the display unit as a basic unit can be realized no matter the backlight structure is a direct type backlight structure, a side type backlight structure or other forms of backlight structures, and the wide applicability of the display device to various forms of backlight modules is improved.

Drawings

Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.

FIG. 1 is a schematic top view of a display device according to an embodiment of the invention;

FIG. 2 is a schematic cross-sectional view of a display device according to an embodiment of the invention;

FIG. 3 is a schematic top view of an optical control layer in a display device according to an embodiment of the present invention;

fig. 4 is a schematic top view of a light control unit in a display device according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a light control unit in a display device according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a display device according to yet another embodiment of the invention;

FIG. 7 is a schematic cross-sectional view of a display device according to yet another embodiment of the invention;

fig. 8 is a schematic top view of a light control unit in a display device according to yet another embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of a light control unit in a display device according to still another embodiment of the present invention;

fig. 10 is a schematic top view of an optical control layer in a display device according to yet another embodiment of the present invention;

FIG. 11 is a schematic cross-sectional view of a display device according to yet another embodiment of the invention;

FIG. 12 is a schematic cross-sectional view of a display device according to yet another embodiment of the invention;

fig. 13 is a schematic top view of a light source module in a display device according to still another embodiment of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.

An embodiment of the present invention provides a Display device, which may be a Liquid Crystal Display (LCD) device. The display device of the embodiments of the present invention may be presented in various forms, some examples of which will be described below.

Fig. 1 and 2 are a schematic top view and a schematic cross-sectional view of a display device according to an embodiment of the invention, wherein a-a line in fig. 1 shows a position of the schematic cross-sectional view in fig. 2.

The display device 1000 includes a display panel 100 and a backlight module 200. The display panel 100 includes a display area DA including a plurality of display units PU. Optionally, each display unit PU comprises at least one sub-pixel. The sub-pixels are the smallest display units on the display panel 100, and may include a plurality of different colors according to the colors displayed by the sub-pixels, for example, the sub-pixels may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, so that the display apparatus 1000 can implement color display. The display panel 100 may include a pixel unit formed by combining a plurality of predetermined sub-pixels with different colors, for example, a pixel unit includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. In one example, each display unit PU includes one or more sub-pixels. In another example, each display unit PU comprises at least one pixel unit, for example one, two or another number of pixel units.

The display panel 100 is disposed on the light-emitting side of the backlight module 200. The backlight module 200 includes a light source assembly 210, a light guide plate 220 and a light control layer 230. The light source module 210 is used to provide light. The light guide plate 220 includes an incident surface 220a facing the light source assembly 210 and an emergent surface 220b facing the display panel 100, and the light guide plate 220 can guide the light rays received by the light source assembly 210 on the incident surface 220a into light rays irradiated from the emergent surface 220b toward the display panel 100. The backlight module 200 is not limited to the edge-type backlight structure or the direct-type backlight structure. For example, the light incident surface 220a of the light guide plate 220 is one side surface of the light guide plate 220, the light source assembly 210 is disposed at one side of the light guide plate 220, and the backlight module 200 is a side-in type backlight structure. For example, the light incident surface 220a and the light emitting surface 220b of the light guide plate 220 are disposed opposite to each other in a direction perpendicular to the display panel 100, and the light source assembly 210 is disposed on a side of the light guide plate 220 away from the display panel 100, at this time, the backlight module 200 is a direct-type backlight structure.

Fig. 3 is a schematic top view of an optical control layer in a display device according to an embodiment of the present invention. The light control layer 230 is positioned between the light guide plate 220 and the display panel 100. The light control layer 230 includes a substrate 231 and a plurality of light control units CU on the substrate 231, each light control unit CU having an orthographic projection on the display panel 100 covering a corresponding one of the display units PU.

Fig. 4 and 5 are a schematic top view and a schematic cross-sectional view of a light control unit in a display device according to an embodiment of the present invention, where line B-B in fig. 4 shows a position of the schematic cross-sectional view of fig. 5. Each light control unit CU includes a first electrode 232, a second electrode 233, and an electrically controlled polarizing structure 234, and the electrically controlled polarizing structure 234 is connected between the first electrode 232 and the second electrode 233. The light control unit CU is configured to: when the voltage difference between the first electrode 232 and the second electrode 233 is less than the threshold voltage, the electrically controlled polarizing structure 234 allows the first polarized light and the second polarized light to pass through; when the voltage difference between the first electrode 232 and the second electrode 233 is greater than or equal to the threshold voltage, the electrically controlled polarization structure 234 absorbs the first polarized light and allows the second polarized light to pass through, and the polarization direction of the first polarized light is perpendicular to the polarization direction of the second polarized light.

According to the display device 1000 of the embodiment of the invention, the backlight module 200 includes the optical control layer 230, the optical control layer 230 is located between the light guide plate 220 and the display panel 100, and includes a plurality of optical control units CU, each of the optical control units CU includes a first electrode 232, a second electrode 233, and an electrically controlled polarization structure 234 connected between the first electrode 232 and the second electrode 233. By controlling the voltage difference between the first electrode 232 and the second electrode 233, it can be controlled whether the electrically controlled polarizing structure 234 allows the first polarized light to pass through. Therefore, each light control unit CU can independently control the backlight brightness to the display panel 100, and the orthographic projection of each light control unit CU on the display panel 100 covers a corresponding one of the display units PU. On the one hand, the backlight brightness of each display unit PU is enabled to be controlled independently, resulting in a higher dynamic contrast of the display device 1000. On the other hand, the light control units CU, which are basic units for controlling the backlight brightness, correspond to the display units PU one by one, so that the fineness of controlling the backlight brightness can be improved compared with the prior art. In addition, the display device 1000 according to the embodiment of the present invention greatly reduces the requirements on the structural form of the light source assembly 210 of the backlight module 200 on the premise of implementing the backlight partition brightness adjustment, that is, the backlight partition brightness control using the light control unit CU or the display unit PU as the basic unit can be implemented no matter in the direct type backlight structure, the side type backlight structure or other types of backlight structures, so that the wide applicability of the display device to various types of backlight modules is improved.

Fig. 6 is a schematic cross-sectional view of a display device according to still another embodiment of the present invention. In some embodiments, the display device 1000 further includes a first polarizer 310, and the first polarizer 310 is located between the display panel 100 and the backlight module 200. In some embodiments, the display device 1000 may further include a second polarizer 320, and the second polarizer 320 is located on a side of the display panel 100 facing away from the backlight module 200.

In the present embodiment, the transmission axis direction of the first polarizer 310 is parallel to the polarization direction of the first polarized light. When the voltage difference between the first electrode 232 and the second electrode 233 is smaller than the threshold voltage, the electrically controlled polarization structure 234 allows the first polarized light and the second polarized light to pass through, and at this time, the first polarized light passing through the light control unit CU can pass through the first polarizer 310, so as to provide backlight to the corresponding display unit PU. When the voltage difference between the first electrode 232 and the second electrode 233 is greater than or equal to the threshold voltage, the electrically controlled polarization structure 234 absorbs the first polarized light and allows the second polarized light to pass through, at this time, the first polarized light cannot pass through the light control unit CU, and the second polarized light cannot pass through the first polarizer 310, so that the corresponding display unit PU is not subjected to backlight irradiation when displaying a black-state picture, so that the black state is darker, and the dynamic contrast during displaying is improved.

Fig. 7 is a schematic cross-sectional view of a display device according to still another embodiment of the present invention. In some embodiments, the display device 1000 further includes a light control driving module 400. The photo driver module 400 is electrically connected to the display panel 100 and the photo control layer 230, and in fig. 7, the electrical connection relationship between the photo driver module 400 and the display panel 100 and the photo control layer 230 is shown by a dotted line. The optical driver module 400 may be an integrated Circuit structure disposed on a Circuit board, and the optical driver module 400 and the display panel 100 and the optical layer 230 may be electrically connected by using an electrical connection structure such as a Flexible Printed Circuit (FPC).

Optionally, the light control driving module 400 is configured to send light control information to each light control unit CU of the light control layer 230 according to the gray scale information of each display unit PU of the display panel 100, so that whether each light control unit CU of the light control layer 230 reacts to the absorption of the first polarized light is closely associated with the display picture of the corresponding display unit PU, so as to immediately control the corresponding light control unit CU according to the display picture of the display unit PU, so that the light control unit CU realizes a configuration matching the gray scale information, and realizes a high dynamic contrast of the display device 1000 with a faster response speed.

In some embodiments, the photocontrol drive module 400 is configured to: sending first light control information to a light control unit CU corresponding to a display unit PU displaying a full black picture, wherein the first light control information enables a voltage difference between the first electrode 232 and the second electrode 233 to be greater than or equal to a threshold voltage; and sending second light control information to the light control unit CU corresponding to the display unit PU displaying the non-full black picture, wherein the second light control information enables the voltage difference between the first electrode 232 and the second electrode 233 to be smaller than the threshold voltage. The gray scale information of the display unit PU displaying the full black frame is, for example, zero gray scale. By configuring the light control driving module 400, the light control unit CU corresponding to the display unit PU of the full black frame absorbs the first polarized light, thereby reducing or even turning off the backlight provided to the display unit PU of the full black frame, improving the visual black state of the display unit PU of the full black frame, deepening the contrast of the frame display, and improving the display effect of the display device 1000.

Fig. 8 and 9 are a schematic top view and a schematic cross-sectional view of a light control unit in a display device according to another embodiment of the present invention, wherein a line C-C in fig. 8 shows a position of the cross-sectional view of fig. 9. In some embodiments, the first electrode 232 and the second electrode 233 are spaced apart in a plane parallel to the substrate 231, such that the electrically controlled polarizing structure 234 between the first electrode 232 and the second electrode 233 is disposed substantially parallel to the substrate 231, and the first electrode 232 and the second electrode 233 are respectively disposed at the sides of the electrically controlled polarizing structure 234, thereby reducing the shielding of the electrically controlled polarizing structure 234 by the first electrode 232 and the second electrode 233 in a direction perpendicular to the substrate 231.

Alternatively, as shown in fig. 9, the electrically controlled polarizing structure 234 includes multiple graphene layers GL. Applying a voltage to each graphene layer GL along the arrangement direction of the first electrode 232 and the second electrode 233 can change the energy level structure of the graphene, so that the graphene layer GL has a polarization absorption characteristic. Each electrically controlled polarizing structure 234 includes multiple graphene layers GL such that the polarizing properties are superimposed in the layer direction to achieve higher polarizing properties. Optionally, the number of graphene layers GL in the electrically controlled polarizing structures 234 is 50 to 150, for example, each electrically controlled polarizing structure 234 includes 120 graphene layers GL, so that when the voltage difference between the first electrode 232 and the second electrode 233 is greater than or equal to the threshold voltage, the multiple graphene layers GL can substantially completely absorb the first polarized light, and improve the polarizing performance of the first polarized light when the voltage difference between the first electrode 232 and the second electrode 233 is greater than or equal to the threshold voltage.

As shown in fig. 8, in each light control unit CU, the first electrode 232 and the second electrode 233 are arranged in parallel with each other, each graphene layer GL includes a predetermined number of graphene units GU arranged from the first electrode 232 to the second electrode 233, and each graphene unit GU includes at least two graphene six-membered rings GR arranged in a direction parallel to the first electrode 232. The graphene six-membered ring GR is a minimum repeating unit of carbon atoms arranged in each graphene layer GU, and each graphene six-membered ring GR includes six carbon atoms approximately arranged at each vertex of a regular hexagon. Each graphene layer GL includes a predetermined number of graphene units GU aligned from the first electrode 232 to the second electrode 233, and in some embodiments, the predetermined number is 1 to 100. For example, each graphene layer GL includes 100 graphene units GU arranged from the first electrode 232 to the second electrode 233, and each graphene unit GU includes at least two graphene six-membered rings GR arranged in a direction parallel to the first electrode 232, so that in each light control unit CU, the electric field between the first electrode 232 and the second electrode 233 can change the energy level structure of each graphene layer GL according to the polarization requirement, and the purpose of electrically controlling polarization is achieved.

Fig. 10 is a schematic top view of an optical control layer in a display device according to yet another embodiment of the present invention. The plurality of light management units CU are arranged in an array on the substrate 231 and the light management layer 230 may further include a binding area BA. The bonding area BA is disposed on the substrate 231 at a side of the plurality of light control units CU. The light control layer 230 may further include a first electrode line 235 and a plurality of second electrode lines 236. The first electrode lines 235 extend to the bonding area BA, and the first electrodes 232 of the plurality of light control units CU are all connected to the first electrode lines 235, wherein the first electrodes 232 of the plurality of light control units CU are all electrically connected to the first electrode lines 235. Each of the second electrode lines 236 extends to the bonding area BA, and the second electrode 233 of each of the light control units CU is electrically connected to a corresponding one of the second electrode lines 236. The first electrode 232 of each light control unit CU receives a first voltage signal, such as a common voltage signal, via the first electrode 232. The second electrode 233 of each light control unit CU receives a second voltage signal via a corresponding second electrode line 236, and by adjusting the voltage of the second voltage signal, the voltage difference between the first electrode 232 and the second electrode 233 in the light control unit CU can be adjusted, so that the electric signal adjustment for determining whether the light control unit CU generates a polarization effect is implemented.

Fig. 11 is a schematic cross-sectional view of a display device according to still another embodiment of the present invention. In some embodiments, the light source module 210 is disposed on at least one side of the light guide plate 220 along a plane parallel to the substrate 231, the light incident surface 220a of the light guide plate 220 is a side surface of the light guide plate 220 facing the light source module 210, and the backlight module 200 is a side-in type backlight structure. According to the display device 1000 of the embodiment of the invention, the light control layer 230 is arranged between the light guide plate 220 and the display panel 100, and the plurality of light control units CU of the light control layer 230 can control whether to absorb the first polarized light according to the voltage difference between the first electrode 232 and the second electrode 233, so as to independently control whether the first polarized light can pass through the light control units CU in a partition manner, thereby realizing partition adjustment of backlight brightness on the premise of adopting a side-in backlight structure, and facilitating realization of high dynamic contrast configuration of the display device 1000 of the side-in backlight structure.

In some embodiments, the backlight module 200 further includes a reflective sheet 240, the reflective sheet is located on a side of the light guide plate 220 away from the display panel 100, and the reflective sheet can reflect the light irradiated from the light guide plate 220 away from the display panel 100, so that the light exits from the light exit surface 220b of the light guide plate 220.

In some embodiments, the backlight assembly 200 further comprises a multilayer optical film 250, the multilayer optical film 250 being positioned between the light guide plate 220 and the light management layer 230, wherein the multilayer optical film 250 comprises at least any one of: a diffusion sheet (Diffuser)251, a Brightness Enhancement Film (BEF) 252, and a reflective polarizer (DBEF) 253. For example, in the present embodiment, the multilayer optical film 250 includes a diffusion sheet 251, a brightness enhancement sheet 252, and a reflective polarizer 253 sequentially disposed from the light guide plate 220 toward the display panel 100.

Fig. 12 is a schematic cross-sectional view of a display device according to still another embodiment of the present invention. In some embodiments, the light source assembly 210 is disposed at a side of the light guide plate 220 facing away from the display panel 100. At this time, the light incident surface 220a and the light emitting surface 220b of the light guide plate 220 are disposed opposite to each other in a direction perpendicular to the display panel 100, and the backlight module 200 is a direct-type backlight structure.

Fig. 13 is a schematic top view of a light source module in a display device according to still another embodiment of the present invention. In the present embodiment, the light source assembly 210 includes a plurality of backlight units BU arranged on a plane parallel to the display panel 100, each of the backlight units BU including at least one light emitting element. The Light Emitting element may be a Light Emitting Diode (LED). In some embodiments, each backlighting unit BU includes one light-emitting element, and in other embodiments, each backlighting unit BU includes two, three, or other numbers of light-emitting elements. In this case, at least one light emitting element in each backlight unit BU is driven to emit light by the same signal, so that all light emitting elements in one backlight unit BU emit light in the same state, i.e., emit light at the same time or stop emitting light at the same time. The light emitting state of each backlight unit BU may be independently controlled, respectively, so that the light source assembly 210 can achieve the divisional luminance adjustment on a plane parallel to the display panel 100. Optionally, the orthographic projection of each backlighting unit BU on the substrate 231 overlaps at least two light control units CU. At this time, on a plane parallel to the display panel 100, the light source assembly 210 can perform partition brightness adjustment in units of backlight units BU, each backlight unit BU corresponds to at least two light control units CU, and the light control layer 230 performs partition brightness re-adjustment in units of light control units CU, so that the backlight received by the display panel 100 is subjected to a more refined partition configuration, thereby improving the fineness of partition brightness adjustment and achieving a higher dynamic contrast of the display apparatus 1000.

An embodiment of the present invention further provides a driving method of a display device, which is used for driving the display device 1000 according to any one of the foregoing embodiments of the present invention. The driving method comprises the following steps: sending gray scale information to each display unit PU of the display panel 100 according to the received frame picture information; and sending light control information to each light control unit CU of the light control layer 230 according to the gray scale information of each display unit PU of the display panel 100, wherein the light control unit CU controls the voltage difference between the first electrode 232 and the second electrode 233 according to the received light control information to control whether the electrically controlled polarization structure 234 absorbs the first polarized light.

According to the driving method of the embodiment of the present invention, whether each of the light control units CU of the light control layer 230 reacts to the absorption of the first polarized light is closely associated with the display picture of the corresponding display unit PU, so that the corresponding light control unit CU can be immediately controlled according to the display picture of the display unit PU, and the light control unit CU can realize the configuration matched with the gray scale information. The light control unit CU is configured to: when the voltage difference between the first electrode 232 and the second electrode 233 is less than the threshold voltage, the electrically controlled polarizing structure 234 allows the first polarized light and the second polarized light to pass through; when the voltage difference between the first electrode 232 and the second electrode 233 is greater than or equal to the threshold voltage, the electrically controlled polarization structure 234 absorbs the first polarized light and allows the second polarized light to pass through, and the polarization direction of the first polarized light is perpendicular to the polarization direction of the second polarized light. Therefore, according to the gray scale information of each display unit PU of the display panel 100, the backlight brightness of each display unit PU is independently controlled, and the high dynamic contrast of the display device 1000 is realized with a fast response speed. The light control units CU correspond to the display units PU one by one, and compared with the prior art, the fineness of backlight brightness control can be improved.

In some embodiments, the sending of the light control information to each light control unit CU of the light control layer 230 according to the gray scale information of each display unit PU of the display panel 100 includes the following steps:

and sending first light control information to the light control unit CU corresponding to the display unit PU displaying the full black picture, wherein the first light control information enables a voltage difference between the first electrode 232 and the second electrode 233 to be greater than or equal to a threshold voltage, and at this time, the electrically controlled polarization structure 234 absorbs the first polarized light and enables the second polarized light to pass through, so that the display unit PU displaying the full black picture has a blacker black state display.

And sending second light control information to the light control unit CU corresponding to the display unit PU displaying the non-full black picture, wherein the second light control information enables a voltage difference between the first electrode 232 and the second electrode 233 to be smaller than a threshold voltage, and at this time, the electronic control polarization structure 234 enables the first polarized light and the second polarized light to pass through, so that the display unit PU normally displays colors.

In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A display device, comprising:

a display panel including a display area including a plurality of display units; and

backlight unit, display panel set up in backlight unit's light-emitting side, wherein backlight unit includes:

a light source assembly;

the light guide plate comprises a light inlet surface facing the light source assembly and a light outlet surface facing the display panel, and the light guide plate can guide the light of the light source assembly received by the light inlet surface into the light irradiated from the light outlet surface to the display panel; and

a light control layer between the light guide plate and the display panel, the light control layer including a substrate and a plurality of light control cells on the substrate, an orthographic projection of each of the light control cells on the display panel covering a corresponding one of the display cells, each of the light control cells including a first electrode, a second electrode, and an electrically controlled polarizing structure connected between the first electrode and the second electrode, the light control cells configured to: when the voltage difference between the first electrode and the second electrode is smaller than the threshold voltage, the electric control polarization structure enables the first polarized light and the second polarized light to pass through; when the voltage difference between the first electrode and the second electrode is greater than or equal to the threshold voltage, the electrically-controlled polarization structure absorbs the first polarized light and allows the second polarized light to pass through, and the polarization direction of the first polarized light is perpendicular to that of the second polarized light.

2. The display device according to claim 1, further comprising:

the first polarizer is positioned between the display panel and the backlight module, and the transmission axis direction of the first polarizer is parallel to the polarization direction of the first polarized light.

3. The display device according to claim 1, further comprising:

the light control driving module is electrically connected with the display panel and the light control layer, and is configured to send light control information to each light control unit of the light control layer according to gray scale information of each display unit of the display panel.

4. The display device of claim 3, wherein the light control driver module is configured to:

sending first light control information to the light control unit corresponding to the display unit displaying a full black picture, wherein the first light control information enables the voltage difference between the first electrode and the second electrode to be larger than or equal to the threshold voltage;

and sending second light control information to the light control unit corresponding to the display unit displaying the non-full black picture, wherein the second light control information enables the voltage difference between the first electrode and the second electrode to be smaller than the threshold voltage.

5. The display device according to claim 1, wherein the first electrode and the second electrode are spaced apart in a plane parallel to the substrate.

6. The display device of claim 5, wherein the electrically controlled polarizing structure comprises multiple graphene layers.

7. The display device according to claim 6, wherein the number of graphene layers in the electrically controlled polarizing structure is 50 to 150.

8. The display device according to claim 6, wherein the first electrode and the second electrode are arranged in parallel with each other in each of the light control units, each of the graphene layers includes a predetermined number of graphene units arranged in a direction from the first electrode toward the second electrode, and each of the graphene units includes at least two graphene six-membered rings arranged in a direction parallel to the first electrode.

9. The display device of claim 1, wherein the plurality of light management units are arranged in an array on the substrate, the light management layer further comprising:

the binding region is arranged on the substrate and is positioned on one side of the plurality of light control units;

a first electrode line extending to the bonding region, the first electrodes of the plurality of light control cells each being electrically connected to the first electrode line; and

each second electrode line extends to the binding region, and the second electrode of each light control unit is electrically connected with a corresponding second electrode line.

10. The display device according to claim 1, wherein each of the display units comprises at least one sub-pixel.

11. The display device according to claim 1, wherein the light source assembly is disposed at a side of the light guide plate facing away from the display panel, the light source assembly comprises a plurality of backlight units arranged in a plane parallel to the display panel, each backlight unit comprises at least one light emitting element, wherein the at least one light emitting element in each backlight unit is driven to emit light via the same signal, wherein a front projection of each backlight unit on the substrate overlaps at least two of the light control units.

12. The display device according to claim 1, wherein the light source assembly is disposed at least one side of the light guide plate along a direction parallel to the substrate plane.

13. The display device of claim 1, wherein the backlight module further comprises a multilayer optical film disposed between the light guide plate and the light control layer, wherein the multilayer optical film comprises at least any one of: diffusion sheet, brightness enhancement sheet, and reflective polarizer.

14. A driving method for a display device, the driving method being for driving the display device according to any one of claims 1 to 13, the driving method comprising:

sending gray scale information to each display unit of the display panel according to the received frame picture information;

and sending light control information to each light control unit of the light control layer according to gray scale information of each display unit of the display panel, wherein the light control unit controls a voltage difference between the first electrode and the second electrode according to the received light control information so as to control whether the electric control polarization structure absorbs the first polarized light.

15. The method according to claim 14, wherein the sending of the light control information to each of the light control cells of the light control layer according to the grayscale information of each of the display cells of the display panel comprises: