CN114530124A

CN114530124A - Display device, driving system and display driving method

Info

Publication number: CN114530124A
Application number: CN202011323207.4A
Authority: CN
Inventors: 朱江; 郑志伟; 廖一遂
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2022-05-24

Abstract

An embodiment of the present application provides a display device, including: a light source assembly for emitting light source light; a dimming assembly positioned on a light path of the light source light, the dimming assembly including light valves for independently adjusting brightness of the light source light incident into each dimming region, respectively, to emit a backlight; the display module is positioned on the backlight light path and used for modulating the backlight according to original image data so as to display an image; the light valve is a liquid crystal film, and the light source light is polarized light; or, the light valve is an electrowetting film and the light source light is unpolarized light. The display device is beneficial to improving the image contrast. The embodiment of the application also provides a display driving method and a driving system.

Description

Display device, driving system and display driving method

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display device, a driving system applied to the display device, and a display driving method applied to the display device and the driving system.

Background

Liquid crystal display devices (e.g., liquid crystal televisions) are becoming increasingly popular because of their light weight, thin body, power saving, and superior display quality. A conventional liquid crystal display device includes a backlight module and a liquid crystal panel stacked one on another. The backlight module is used for providing light source light, and the liquid crystal panel is used for displaying images by utilizing the light source light. The liquid crystal panel includes a plurality of pixel regions. During the period of displaying each frame of image, the pixel regions respectively emit image light to cooperate with each other to display a complete frame of image. The image displayed by the liquid crystal panel can be changed by changing the color and brightness of the image light emitted from the plurality of pixel regions, respectively. However, the liquid crystal panel has a problem of light leakage, and when an image is displayed, the luminance of image light actually emitted from one or more pixel regions requiring dark image light is greater than the required luminance, so that the contrast of the finally displayed image is low.

One solution to the above problem in the prior art is to partition the backlight module and adjust the light brightness of the light source for each partition, so as to meet the different brightness requirements of different pixel regions. However, the scheme is limited by the size of the backlight source in the backlight module, and the number of the partitions is much smaller than that of the pixel areas, so that different brightness requirements of different pixel areas are difficult to meet, and the brightness adjusting effect is poor.

Another solution to solve the above problems in the prior art is to add a liquid crystal panel to perform zone dimming on the light source light emitted from the backlight module. According to the scheme, the number of partitions for partition dimming is increased, but light source light sequentially passes through four polaroids (a liquid crystal panel originally used for displaying comprises two polaroids, and a newly-added dimming liquid crystal panel also comprises two polaroids), so that the light transmittance of a light source is low; meanwhile, the overall thickness of the liquid crystal display device is also large; furthermore, the liquid crystal panel for displaying images and the liquid crystal panel for dimming respectively receive the control signals to actuate, and the actuation of the liquid crystal panel are not linked, so that the matching effect is poor.

Disclosure of Invention

A first aspect of the present application provides a display device comprising:

a light source assembly for emitting light source light;

a dimming assembly positioned on a light path of the light source light, the dimming assembly including light valves for independently adjusting brightness of the light source light incident into each dimming region, respectively, to emit a backlight; and

the display module is positioned on the backlight light path and used for modulating the backlight according to original image data so as to display an image;

the light valve is a liquid crystal film, and the light source light is polarized light; or, the light valve is an electrowetting film and the light source light is unpolarized light.

The display device, wherein the light valve defines or comprises a plurality of dimming areas. The light source light is respectively adjusted in different regions through the dimming regions of the light valve, so that the backlight brightness finally incident to the display module is better matched with the backlight brightness required by the image, and the contrast of the image displayed by the display device is favorably improved. When the liquid crystal film is used as the light valve, the light source light adopts polarized light, so that the dimming assembly does not need to match an upper polarizer and a lower polarizer with the light valve, the thickness of the dimming assembly is reduced, and the light transmittance of the light source light is improved. When the electrowetting film is used as the light valve, the display device does not need to provide polarized light as light source light, thereby being beneficial to simplifying the structure of the light source component.

In some embodiments, the display module comprises a plurality of pixels;

the orthographic projection of each dimming area of the light valve on the display module is overlapped with one or more pixels of the display module.

Therefore, because each dimming area and the pixels in the display module have the relationship, the brightness of the backlight emitted by each dimming area can be set according to the gray-scale value of each pixel or each adjacent pixel, and the backlight brightness required by each pixel when an image is displayed can be better matched.

In some embodiments, the orthographic projection of each dimming region on the display module overlaps the same number of pixels on the display module.

Therefore, the dimming method is beneficial to enabling dimming to be more uniform and also beneficial to simplifying a calculation process.

In some embodiments, the light source module comprises a plurality of light-emitting areas, and the brightness of the light source light emitted by each light-emitting area is independently controlled;

the orthographic projection of each light emitting area of the light source assembly on the light valve overlaps one or more dimming areas of the light valve.

Therefore, on the basis of utilizing the dimming component to adjust the brightness, the light source component is divided into the light emitting areas to adjust the brightness of each light emitting area, so that the brightness of each pixel of the backlight matching image is further facilitated, and the image contrast is improved.

In some embodiments, the orthographic projection of each light emitting region on the light valve overlaps the same number of dimming regions on the light valve.

A second aspect of the present application provides a display device comprising:

the driving system is used for acquiring dimming driving data according to original image data and acquiring light source driving data and display driving data according to the dimming driving data;

a light source assembly electrically connected to the driving system for emitting light source light according to the light source driving data;

the dimming assembly is electrically connected with the driving system and is positioned on a light path of the light source light, the dimming assembly comprises a light valve, the light valve comprises a plurality of dimming areas, and the light valve is used for respectively and independently adjusting the brightness of the light source light entering each dimming area according to the dimming driving signal so as to emit backlight; and

and the display module is electrically connected with the driving system, is positioned on the light path of the backlight and is used for modulating the backlight according to the display driving data so as to display images.

According to the display device, the light source light is respectively adjusted in the different regions through the dimming regions of the light valve, so that the backlight brightness finally incident to the display module is better matched with the backlight brightness required by the image, and the contrast of the image displayed by the display device is favorably improved. Furthermore, the light source driving data, the dimming driving data and the display driving data are obtained by calculating the original image data, the light source driving data and the display driving data are obtained by correspondingly processing the dimming driving data, and an incidence relation is established among the light source driving data, the dimming driving data and the display driving data, so that the brightness of light source light emitted by the light source component, the brightness of backlight emitted by the dimming component and the brightness required by the display module when the display module displays images are better matched, and the image contrast displayed by the display device is favorably improved.

In some embodiments, the light valve is a liquid crystal film and the source light is polarized.

So, when adopting the liquid crystal film as the light valve, the light source light adopts the polarized light for the subassembly of adjusting luminance need not to be for light valve collocation upper and lower polaroid, consequently is favorable to reducing the thickness of the subassembly of adjusting luminance, also is favorable to promoting the light transmissivity of light source light.

In some embodiments, the light valve is an electrowetting film and the source light is unpolarized.

Therefore, when the electrowetting film is used as the light valve, the display device does not need to provide polarized light as light source light, thereby being beneficial to simplifying the structure of the light source component.

In some embodiments, the display module comprises a plurality of pixels;

The third aspect of the present application provides a display driving method, which is applied to a display device, where the display device includes a backlight module and a display module; the display driving method includes:

receiving original image data;

acquiring dimming driving data according to the original image data;

acquiring light source driving data according to the dimming driving data, and acquiring display driving data according to the dimming driving data and the original image data; and

and driving the backlight module to emit backlight according to the light source driving data and the dimming driving data, and driving the display module according to the display driving data so that the display module modulates the backlight to display images.

Therefore, the light source driving data, the dimming driving data and the display driving data are obtained by calculating the original image data, the light source driving data and the display driving data are obtained by correspondingly processing the dimming driving data, and an incidence relation is established among the light source driving data, the dimming driving data and the display driving data, so that the brightness of light source light emitted by the light source assembly, the brightness of backlight emitted by the dimming assembly and the matching degree of the brightness required by the display module when the display module displays images are better, and the image contrast displayed by the display device is favorably improved.

In some embodiments, the backlight module comprises a light valve including a plurality of dimming areas; the step of obtaining dimming driving data according to the original image data specifically includes:

acquiring a first brightness value of each dimming area according to the original image data;

performing dark color enhancement on the first brightness value to obtain a second brightness value; and

and performing spatial filtering and temporal filtering on the second brightness value to obtain the dimming driving data.

Therefore, for some images, there may be a case where there are more bright points (pixels with larger gray scale values) and fewer dark points (pixels with smaller gray scale values), and in the above case, the gray scale values of the dark points may be adjusted lower, or/and the gray scale values of the bright points may be adjusted higher, so that the difference between the brightness values of the bright points and the dark points is larger, so that the bright points are more prominent, which is beneficial to improving the image contrast. The second brightness value of each dimming area is spatially filtered, so that the second brightness value of each dimming area is adjusted according to the second brightness value of the dimming area adjacent to the second brightness value, the second brightness value of each dimming area is smooth in transition in space, and the image effect is improved. By carrying out time filtering on the second brightness value of each dimming area, the change rate of the brightness of each dimming area when different frame images are displayed can be reduced, the continuity of adjacent frame images is enhanced, and the image flicker phenomenon is reduced.

In some embodiments, the backlight module comprises a light source assembly including a plurality of light-emitting areas; the step of obtaining light source driving data according to the dimming driving data specifically includes:

acquiring a third brightness value of each light emitting area according to the dimming driving data;

performing dark color enhancement on the third brightness value to obtain a fourth brightness value; and

spatially and temporally filtering the fourth luminance value to obtain the light source driving data.

Thus, for some images, there may be a case where there are more bright points (pixels with larger gray scale values) and fewer dark points (pixels with smaller gray scale values), and in the above case, the gray scale value of the dark point may be adjusted lower, or/and the gray scale value of the bright point may be adjusted higher, so that the difference between the brightness values of the bright point and the dark point is larger, so that the bright point is more prominent, which is beneficial to improving the image contrast. The fourth brightness value of each light-emitting area is subjected to spatial filtering, so that the fourth brightness value of each light-emitting area is adjusted according to the fourth brightness value of the light-emitting area adjacent to the fourth brightness value, the fourth brightness value of each light-emitting area is smooth in transition in space, and the image effect is improved. By carrying out time filtering on the fourth brightness value of each light-emitting area, the change rate of the brightness of each light-emitting area when different frame images are displayed can be reduced, the continuity of adjacent frame images is enhanced, and the image flicker phenomenon is reduced.

In some embodiments, the display module comprises a plurality of sub-pixels, and the raw image data comprises raw gray-scale values of each sub-pixel; the step of obtaining display driving data according to the dimming driving data and the original image data specifically includes:

and mapping the original gray-scale value of each sub-pixel into a modulation gray-scale value according to the original image data, wherein the difference of the modulation gray-scale values of the sub-pixels is larger than that of the original gray-scale values of the sub-pixels.

Therefore, in a frame of image displayed by the display device, if the gray-scale values of the sub-pixels are relatively close, for example, the gray-scale values are all between 220 and 250, the difference of the gray-scale values of the sub-pixels can be enlarged by the function mapping method, which is beneficial to further improving the image contrast.

The fourth aspect of the present application provides a driving system, which is applied to a display device, where the display device includes a backlight module and a display module; the drive system includes:

the dimming data acquisition module is electrically connected with the backlight module and used for receiving original image data and acquiring dimming driving data according to the original image data;

the light source data acquisition module is electrically connected with the dimming data acquisition module and the backlight module and used for acquiring light source driving data according to the dimming driving data, and the light source driving data is used for driving the backlight module to emit backlight; and

and the display data acquisition module is electrically connected with the dimming data acquisition module and the display module and used for acquiring display driving data according to the dimming driving data and the original image data, and the display driving data is used for driving the display module so as to enable the display module to display images according to the backlight.

The light source driving data, the dimming driving data and the display driving data are obtained by calculating original image data, the light source driving data and the display driving data are obtained by correspondingly processing the dimming driving data, and an incidence relation is established among the light source driving data, the dimming driving data and the display driving data, so that the brightness of light source light emitted by the light source assembly, the brightness of backlight emitted by the dimming assembly and the matching degree of the brightness required by the display module when the display module displays images are better, and the image contrast displayed by the display device is favorably improved.

A fifth aspect of the present application provides a display device comprising:

a backlight module;

a display module; and

a drive system; the drive system includes:

According to the display device, the light source light is respectively subjected to regional adjustment through the plurality of dimming regions of the light valve, so that the final backlight brightness incident to the display module is better matched with the backlight brightness required by the image, and the contrast of the image displayed by the display device is favorably improved. Furthermore, the light source driving data, the dimming driving data and the display driving data are obtained by calculating the original image data, the light source driving data and the display driving data are obtained by correspondingly processing the dimming driving data, and an incidence relation is established among the light source driving data, the dimming driving data and the display driving data, so that the brightness of light source light emitted by the light source component, the brightness of backlight emitted by the dimming component and the brightness required by the display module when the display module displays images are better matched, and the image contrast displayed by the display device is favorably improved.

Drawings

Fig. 1 is a schematic perspective view of a display device according to a first embodiment.

Fig. 2 is a schematic structural diagram of a backlight module according to an embodiment.

FIG. 3 is a schematic plan view illustrating an arrangement of light sources on a driving substrate according to an embodiment.

Fig. 4 is a schematic plan view of a dimming component according to an embodiment.

Fig. 5 is a schematic structural diagram of a display module according to an embodiment.

Fig. 6 is another schematic structural diagram of a display module according to an embodiment.

Fig. 7 is a diagram illustrating a correspondence relationship between a light emitting region, a dimming region, and a pixel according to an embodiment.

Fig. 8 is a schematic diagram illustrating an electrical connection relationship between the driving system and the backlight module and between the driving system and the display module according to the first embodiment of the disclosure.

Fig. 9 is a schematic block diagram of a driving system according to an embodiment.

Fig. 10 is a schematic diagram illustrating a process flow of a display driving method according to an embodiment.

FIG. 11 is another schematic diagram illustrating a process flow of the display driving method according to the first embodiment.

Fig. 12 is a schematic diagram of coordinate distribution of blocks.

Fig. 13 is a schematic structural diagram of a display device according to a second embodiment.

Fig. 14 is another schematic structural diagram of the display device according to the second embodiment.

Fig. 15 is a schematic structural diagram of a dimming component according to a second embodiment.

Fig. 16 is a schematic structural diagram of the dimming component according to the second embodiment in a state of being not driven by voltage.

Fig. 17 is a schematic structural diagram of a dimming component in a second embodiment in a voltage-driven state.

Fig. 18 is a diagram illustrating a correspondence relationship between the light emitting region, the dimming region, and the pixel according to the second embodiment.

Fig. 19 is a schematic structural diagram of a driving system according to a second embodiment.

Fig. 20 is a schematic structural diagram of a driving system in a modified embodiment.

Description of the main elements

Display device

10, 20

Interaction surface 11

Backlight module

12, 22

Light source assembly

121, 221

Driving

substrates

1211, 2211

Light emitting sources

1212, 2212

Polarization-maintaining

diffusion films

1213 and 2213

Polarization maintaining

quantum dot films

1214 and 2214

Polarization recovery optical film 1215

Light emitting region

1216, 2216

Dimming components 122, 222

First substrates

1221, 2221

Second substrates

1222, 2222

Light valves

1223, 2223

Dimming

areas

1224, 2224

First electrode 2225

Second electrode 2226

Hydrophobic layer 2227

Ink layer 2228

Aqueous layer 2229

Display module

13, 23

Lower polarizer 131

Drive substrate 132

Liquid crystal layer 133

Color filter substrate 134

Filters

134R, 134G, 134B

Upper polarizer 135

Pixel

136, 236

Sub-pixel R, G, B

Cover plate 14

Drive system

15, 25

System-on-chip 151

Control chip 152

Dimming data acquisition module 1521

Local light control module 1522

Sensitization data acquisition module 1524

Display driver chip 153

Photosensitive driving chip 154

Dimming driving chip 155

Light source driving chip 156

FPGA chip 251

First timing controller 252

Second timing controller 253

Photosensitive layer 16

Steps S1, S2, S3, S4, S21, S22, S23, S31, S32, S33, S34

Detailed Description

The embodiments of the present application will be described below with reference to the drawings.

Example one

The present embodiment provides a display device for displaying an image. The display device can be a smart phone, a portable computer, a wired/wireless television. The display device can also be a functional module used for displaying images in an intelligent device, such as a vehicle-mounted display, a display screen of an intelligent household appliance and the like.

Referring to fig. 1, a display device 10 provided in the present embodiment has an interactive surface 11. The interactive surface 11 is used for presenting images. In other embodiments, the interactive surface 11 may also be used to provide other interactive functions, and the interactive surface 11 may also be used to receive touch operations or identify fingerprints.

The display device 10 includes a backlight module 12, a display module 13 and a cover plate 14 stacked in sequence. The surface of the cover plate 14 away from the backlight module 12 and the display module 13 is an interactive surface 11. The backlight module 12 is used for emitting backlight to one side of the display module 13. The display module 13 is configured to receive the backlight and modulate the backlight to emit image light. The cover plate 14 is a transparent cover plate for transmitting the image light. The image formed by this image light is observable by an observer at the interaction surface 11.

The display device 10 further includes a photosensitive layer 16 located between the backlight module 12 and the display module 13. The photosensitive layer 16 is used for receiving light of a specific wavelength band (for example, infrared light emitted by a remote control device) and generating an electrical signal according to the light of the specific wavelength, and the display device 10 can start a corresponding function according to the electrical signal, for example, display an image according to the electrical signal.

Referring to fig. 2, the backlight module 12 includes a light source module 121 and a light adjusting module 122 stacked on each other. Referring to fig. 1 and fig. 2, the light adjusting assembly 122 is disposed between the display module 13 and the light source assembly 121.

Referring to fig. 2, the light source assembly 121 includes a driving substrate 1211 and a plurality of light sources 1212 disposed on a surface of the driving substrate 1211 close to the dimming element 122. That is, the light source assembly 121 is a direct-type light source assembly. The driving substrate 1211 is provided with a driving circuit (not shown). Each Light-Emitting source 1212 is a Light-Emitting Diode (LED). For example, each Light-Emitting source 1212 is a mini Light-Emitting Diode (mini LED). The driving circuit is electrically connected to each light source 1212, and is configured to respectively drive each light source 1212 to emit light source light, and respectively control the light intensity (or the light emitting brightness) of each light source 1212. That is, the light emission intensities of the light emission sources 1212 are controlled independently of each other by the driving circuit.

In the present embodiment, the light source module 121 includes a plurality of light emitting areas 1216, each of which has a light emitting source 1212. In other embodiments, each light-emitting region has a plurality of light-emitting sources 1212, and the number of the light-emitting sources 1212 in each light-emitting region is the same. The smaller the number of light-emitting sources 1212 in each light-emitting region, the finer the control of the light intensity of the light source for each light-emitting region, which is advantageous for improving image contrast.

Referring to fig. 3, the light sources 1212 are arranged on the driving substrate 1211 in an array including a plurality of rows (X direction) and a plurality of columns (Y direction). And the plurality of light-emitting sources 1212 are arranged uniformly, i.e., each light-emitting source 1212 is equally spaced from all adjacent light-emitting sources 1212 in its row and column. The light sources 1212 are uniformly arranged to improve uniformity of the light from the light sources. In this embodiment, the light source light emitted by each light emitting source 1212 is polarized light; and the light source light emitted by each light emitting source 1212 is white light.

Referring to fig. 2 again, the light source module 121 further includes a polarization-maintaining diffusion film 1213. The polarization maintaining diffusion film 1213 is located between the dimming component 122 and the plurality of light emitting sources 1212. The polarization maintaining diffusion film 1213 is filled with a diffusion material. The polarization maintaining diffusion film 1213 is used for diffusing the light source light, increasing the light emitting area of the light source light, improving the brightness uniformity, stabilizing the light chromaticity of the light source, and keeping the polarization direction of the light source light unchanged.

The light source module 121 further includes a polarization maintaining quantum dot film 1214. The polarization maintaining quantum dot film 1214 is located between the polarization maintaining diffusion film 1213 and the dimming component 122. The polarization maintaining quantum dot film 1214 is filled with quantum dots. The polarization-maintaining quantum dot film 1214 is used to receive the light source light emitted from the polarization-maintaining diffusion film 1213, and to improve the color purity of the light source light by the quantum dot pairs, and to keep the polarization direction of the light source light unchanged during the process.

The light source module 121 further includes a polarization recovery optical film 1215. The polarization recovery optical film 1215 is positioned between the polarization maintaining quantum dot film 1214 and the dimming component 122. The light source light is reused by selectively reflecting it.

In other embodiments, the light source module 121 may further include other types of film layers, such as an antireflection film, without limitation.

Referring to fig. 2, the light adjusting component 122 is located on the emission path of the light source light for modulating the brightness of the light source light. In this embodiment, the dimming assembly 122 includes a first substrate 1221, a second substrate 1222, and a light valve 1223 positioned between the first substrate 1221 and the second substrate 1222. The second substrate 1222 is positioned between the first substrate 1221 and the light source assembly 121. In this embodiment, the first substrate 1221 and the second substrate 1222 are made of a flexible transparent material. In other embodiments, the first substrate 1221 and the second substrate 1222 may also be a rigid transparent material, such as glass. The flexible material can be made thinner than the rigid material. And the flexible material is not easy to be abraded with other rigid materials.

The first substrate 1221 and the second substrate 1222 are each provided with a driving circuit (not shown). The circuit on the first substrate 1221 applies the light valve 1223 with a first voltage, and the driving circuit on the second substrate 1222 applies the light valve 1223 with a second voltage. The light valve 1223 is a liquid crystal film, which includes a plurality of liquid crystal molecules, each of which is deflected according to a voltage difference between the first voltage and the second voltage, and the voltage difference is different and the deflection angle is different. The light source light may be transmitted from the first substrate 1221 to the light valve 1223. When the light source light enters the light valve 1223, the light quantity of the light source light passing through the light valve 1223 differs depending on the angle of deflection of the liquid crystal molecules, and the brightness of the light emitted from the light valve 1223 can be controlled by controlling the angle of deflection of the liquid crystal molecules. That is, the brightness of the light emitted from the light valve 1223 may be controlled by controlling the values of the first voltage and the second voltage. The light whose brightness is modulated by the light valve 1223 is transmitted through the second substrate 1222, and the light transmitted through the second substrate 1222 is defined as the backlight. The backlight is white polarized light.

Referring to fig. 4, the light valve 1223 includes a plurality of dimming areas 1224. Each dimming area 1224 is used to adjust the brightness of light source light incident thereon. Referring to fig. 2 and 4, the first substrate 1221 is used to apply a first voltage to each of the dimming areas 1224, and the second substrate 1222 is used to apply a second voltage to each of the dimming areas 1224. That is, each dimming area 1224 corresponds to a first voltage and a second voltage. The brightness of the light emitted from each of the dimming areas 1224 can be controlled independently of each other by adjusting the first voltage and the second voltage of each of the dimming areas 1224, respectively. In the present embodiment, the number of the dimming areas 1224 on the light valve 1223 can be hundreds of thousands, so that finer dimming can be achieved.

Referring to fig. 5, the display module 13 includes a lower polarizer 131, a driving substrate 132, a liquid crystal layer 133, a color filter substrate 134, and an upper polarizer 135 stacked in sequence. The lower polarizer 131 is closer to the backlight module 12 than the upper polarizer 135. The backlight sequentially passes through the lower polarizer 131, the driving substrate 132, the liquid crystal layer 133, the color filter substrate 134, and the upper polarizer 135.

The upper polarizer 135 and the lower polarizer 131 are used to select a polarization direction of the backlight, that is, only light of a specific polarization direction may pass through the upper polarizer 135 and the lower polarizer 131. The driving substrate 132 is a transparent substrate, such as a glass substrate, and allows the backlight to pass through. The driving substrate 132 is provided with a driving circuit (not shown) for driving the liquid crystal molecules in the liquid crystal layer 133 to deflect. Like the light valve 1223 described above, the liquid crystal layer 133 serves to allow backlight of different amounts of light to pass according to the difference in the deflection angle of the liquid crystal molecules. Light excellent from the liquid crystal layer 133 is incident on the color filter substrate 134. The color filter substrate 134 is used for selecting the wavelength of the received backlight, that is, the color filter substrate 134 only allows light with a specific wavelength (or a specific wavelength band) to pass through.

Referring to fig. 6, the display module 13 includes a plurality of pixels 136 arranged in an array. Each pixel 136 is independently controlled by a display signal to emit image light independently of each other. In this embodiment, each pixel 136 includes three sub-pixels, R, G and B respectively. Each sub-pixel (R, G and B) is independently controlled by a display signal to emit image light independently of each other. The sub-pixel R emits red image light, the sub-pixel G emits green image light, and the sub-pixel B emits blue image light. In other embodiments, each pixel may include other numbers of sub-pixels, such as four sub-pixels: subpixels R, G, B and W, subpixel W emitting white image light.

The color filter substrate 134 includes a plurality of filters arranged in an array, and the plurality of filters include a plurality of filters 134R, a plurality of filters 134G, and a plurality of filters 134B. The filters 134R correspond to the sub-pixels R one to one, the filters 134G correspond to the sub-pixels G one to one, and the filters 134B correspond to the sub-pixels B one to one. Each filter 134R is configured to filter the backlight when receiving the white backlight, and only allow light in a red wavelength band in the backlight to pass through, so that the sub-pixel R corresponding to the filter 134R emits red image light; each filter 134G is configured to filter the backlight when receiving the white backlight, and only allow light in a green wavelength band in the backlight to pass through, so that the sub-pixel G corresponding to the filter 134G emits green image light; each filter 134B is configured to filter the backlight when receiving the white backlight, and only light in a blue wavelength band in the backlight is allowed to pass through, so that the sub-pixel B corresponding to the filter 134B emits image light of blue color.

The display device 10 operates in a plurality of display periods, each of which displays one frame of image. In one display period, by applying a display signal to each pixel 136, so that each pixel 136 independently emits image light according to the display signal, the image light emitted from all pixels 136 are combined together to form a complete image of one frame. In one display period, the luminance of the image light emitted from each pixel 136 may be different; the brightness of the image light emitted from the same pixel 136 in different display periods (when different images are displayed) may also be different. The required backlight brightness for each pixel 136 is changed.

In this embodiment, the brightness of the light emitted from each light emitting source 1212 and the brightness of the light emitted from each dimming area 1224 are synchronously and independently adjusted to meet the requirements of each pixel 136 for different-brightness backlights.

Referring to fig. 7, each light emitting region 1216 corresponds to a plurality of adjacently arranged dimming regions 1224. That is, the light emitted from each light emitting region 1216 is incident on a plurality of dimming regions 1224 corresponding to the light emitting region 1216. That is, the orthographic projection of each light emitting area 1216 on the light valve 1223 overlaps a plurality of adjacently arranged dimming areas 1224. The brightness of the light source light emitted from each light emitting region 1216 is determined according to the brightness required by the plurality of adjacently arranged dimming regions 1224 to which it corresponds.

Each dimming area 1224 on the light valve 1223 corresponds to a plurality of pixels 136 in the display module 13. The light emitted from each dimming region 1224 is incident on a plurality of pixels 136 corresponding to the dimming region 1224. That is, the orthographic projection of each dimming area 1224 on the display module 13 overlaps a plurality of adjacently arranged pixels 136 on the display module 13. The brightness of the light emitted by each of the dimming areas 1224 is determined by the backlight required by its corresponding plurality of pixels 136.

In this embodiment, the number of the pixels 136 corresponding to each of the light-adjusting regions 1224 is the same, and the number of the light-adjusting regions 1224 corresponding to each of the light-emitting regions 1216 is the same, which is beneficial to simplifying the operation process of the brightness.

In an alternative embodiment, the plurality of dimming areas 1224 included on the light valve 1223 correspond to the plurality of pixels 136 included in the display module 13. That is, the light emitted from each dimming region 1224 is incident on the pixel 136 corresponding to the dimming region 1224. That is, the orthographic projection of each dimming area 1224 on the display module 13 completely overlaps one pixel 136 in the display module 13.

In this embodiment, the dimming regions 1224 correspond to the plurality of pixels 136, and compared with the one-to-one correspondence between the dimming regions 1224 and the pixels 136, the number of the dimming regions 1224 is small, so that light loss caused by respective dimming of the dimming regions 1224 is reduced, and the transmittance of the backlight is improved, thereby improving the light utilization rate. In this modified embodiment, the dimming areas 1224 correspond to the pixels 136 one-to-one, and the dimming areas 1224 adjust the backlight brightness more finely than the dimming areas 1224 correspond to a plurality of pixels 136, which is beneficial to further improving the image display effect.

Referring to fig. 8, the display device 10 further includes a driving system 15. In this embodiment, the driving system 15 includes a system-on-chip 151, a control chip 152 electrically connected to the system-on-chip 151, and a display driving chip 153, a photosensitive driving chip 154, a dimming driving chip 155, and a light source driving chip 156 respectively electrically connected to the control chip 152.

The display driving chip 153 is electrically connected to the driving circuit on the driving substrate 132 in the display module 13, and is configured to output a display driving signal to the driving circuit to control the liquid crystal layer 133 to modulate light so as to generate image light. The dimming driving chip 155 is electrically connected to the driving circuits on the first substrate 1221 and the second substrate 1222 of the dimming component 122, and is configured to output a dimming driving signal to the driving circuits to control the values of the first voltage and the second voltage, so as to control the dimming of the light valve 1223. The light source driving chip 156 is electrically connected to the driving circuit on the driving substrate 1211 of the light source assembly 121, and is configured to output a light source driving signal to the driving circuit so as to drive the light emitting source 1212 to emit light. The photosensitive driving chip 154 is electrically connected to the photosensitive layer 16, and is used for receiving the electrical signal output by the photosensitive array to the control chip 152.

Referring to fig. 9, the control chip 152 includes a dimming Data acquiring module (Light Valve Data Processing)1521, a Local dimming module (Local dimming)1522 and a photosensitive Data acquiring module (PD Signal Processing)1524, wherein the Local dimming module 1522 includes a Light source Data acquiring module and a display Data acquiring module. The dimming data acquisition module 1521 is electrically connected to the display data acquisition module and the light source data acquisition module, respectively. The dimming data acquisition module 1521 is configured to acquire dimming driving data, the light source data acquisition module is configured to acquire light source driving data, and the display data acquisition module is configured to acquire display driving data. The photosensitive data obtaining module 1524 is configured to convert the electrical signal generated by the photosensitive layer into a digital signal, and perform corresponding data processing, for example, process the digital signal to generate position information.

The control chip 152 has a first input terminal VBORx and a second input terminal PDRx, which are electrically connected to the system-on-chip 151. The system-on-chip 151 inputs raw image data to the control chip 152 through the first input terminal VBORx. The exposure data obtaining module 1524 receives the exposure signal through the second input terminal PDRx.

The control chip 152 further includes an Over-voltage Driver module (Over Driver), a display uniformity compensation module (DEMURA), a Gamma correction module (Gamma), and a low-voltage differential/point-to-point output module (mini-LVDS/P2P TX), which are electrically connected to the display data acquisition module and sequentially connected in series, and the low-voltage differential/point-to-point output module is further electrically connected to the display module 13 for outputting a display driving signal to the display module 13.

The control chip 152 further includes an Over-voltage driving module (Over Driver), a data Mapping module (Mapping Function), a Line memory (synchronization) module (Line buffer), and a low-voltage differential/point-to-point output module (mini-LVDS/P2P TX), which are electrically connected to the dimming data obtaining module 1521 and sequentially connected in series, and the low-voltage differential/point-to-point output module is further electrically connected to the dimming component 122 for outputting a dimming driving signal to the dimming component 122.

Among them, the Over Driver, DEMURA, Gamma, mini-LVDS/P2P TX, Mapping Function, Line buffer are all commonly used functional modules in the prior art, and are not described too much.

The manner in which the display driving data, the dimming driving data, and the light source driving data are obtained is described in detail below.

The present embodiment further provides a display driving method, which is applied to the display device 10, and in particular, the display driving method is applied to the driving system 15. Referring to fig. 10, the display driving method includes the following steps:

step S1, receiving original image data;

step S2, generating dimming driving data from the raw image data;

step S3, generating light source driving data according to the dimming driving data, and generating display driving data according to the dimming driving data and the original image data;

and step S4, driving the backlight module to emit backlight according to the light source driving data and the dimming driving data, and driving the display module according to the display driving data, so that the display module modulates the backlight to display images.

In step S1, the raw image data is the data of the image to be displayed stored or received by the display device 10, which includes the gray-scale values of the sub-pixels (sub-pixels R, G and B) of each frame of image to be displayed by the display device 10. The gray scale value of each subpixel is used to characterize the brightness level of light that the subpixel needs to pass through when the display device 10 is displaying an image. In this embodiment, the gray scale value of the display device is an integer between 0 and 255, wherein the minimum brightness is represented when the gray scale value is 0, and the maximum brightness is represented when the gray scale value is 255. The gray scale value of each sub-pixel remains unchanged during the time that the display device 10 displays the same frame of image. Each sub-pixel may have a different gray scale value when displaying images of different frames.

Referring to fig. 11, step S2 specifically includes:

step S21, obtaining a first brightness value of each dimming area of the light valve according to the original image data;

step S22, performing dark color enhancement on the first brightness value to obtain a second brightness value; and

step S23, performing spatial filtering and temporal filtering on the second luminance value to obtain the dimming driving data.

As described above, the original image data includes the gray-scale values of the respective sub-pixels of each frame image. In one display period, the original image data includes gray-scale values of all sub-pixels in one frame image to be displayed in the display period. The display device 10 prestores a mapping relationship between a gray-scale value and luminance. And uniquely determining the brightness corresponding to each sub-pixel according to the gray-scale value of each sub-pixel. The light valves 1223 have a plurality of pixels 136 corresponding to respective dimming areas 1224, each pixel 136 including a plurality of sub-pixels, and thus a plurality of sub-pixels corresponding to each dimming area 1224.

In step S21, the first luminance value of each of the dimming regions 1224 may be obtained by averaging the luminance of each of the sub-pixels corresponding to each of the dimming regions 1224, or by gray level histogram equalization. The brightness value of each of the dimming areas 1224 calculated in step S21 is defined as the first brightness value.

For some images, there may be more bright spots (pixels with larger gray scale values) and less dark spots (pixels with smaller gray scale values). Under the condition, the gray scale value of the dark spot can be adjusted to be low, or/and the gray scale value of the bright spot can be adjusted to be high, so that the brightness value difference between the bright spot and the dark spot is larger, the bright spot is more prominent, and the image contrast can be favorably improved.

Therefore, in step S22, the first brightness value of each dimming area 1224 in the light valve 1223 is adjusted corresponding to the gray-scale value of each pixel 136. The lower first luminance value is adjusted down and/or the higher first luminance value is adjusted up to obtain the second luminance value. Wherein "lower" and "higher" can be distinguished by setting a brightness threshold. For example, a first threshold value X and a second threshold value Y are set, X < Y, a first luminance value lower than the first threshold value X is adjusted low, and a first luminance value higher than the second threshold value Y is adjusted high.

As mentioned above, the pixels 136 in the display module 13 are arranged in an array including a plurality of rows and a plurality of columns. The plurality of dimming areas 1224 on the light valve 1223 are arranged corresponding to the plurality of pixels 136, and the respective dimming areas 1224 are also arranged in an array including a plurality of rows and a plurality of columns. The dimming area 1224 is defined by a position coordinate (j, i), and the dimming area 1224 with the position coordinate (j, i) is the dimming area arranged in the jth row and ith column.

In step S23, the second luminance value is spatially filtered:

referring to fig. 12, a dimming region 1224 with coordinates (j, i) is defined as a target dimming region, the target dimming region 1224 and a plurality of adjacent dimming regions 1224 located in the same row and the same column are divided into a dimming region group, the coordinates of the adjacent dimming regions 1224 are respectively represented by (j-1, i-1), (j-1, i), (j, i-1), (j +1, i +1), (j +1, i), (j, i +1), (j-1, i +1), (j +1, i-1), as can be seen from fig. 12, the dimming regions divided into the same dimming region group form a 3 × 3 array, in other embodiments, the dimming region group may be divided differently, for example, in a 4 × 4 array;

determining whether the target dimming area 1224 is the dimming area with the maximum second brightness value in the dimming area group in which the target dimming area 1224 is located;

if the judgment result is yes, the second brightness value is not changed;

if not, a second brightness value of the dimming region with the maximum second brightness value in the dimming region group where the target dimming region 1224 is located is obtained, and the second brightness value of the target dimming region 1224 is adjusted according to the preset filter coefficient and the second brightness value of the dimming region with the maximum second brightness value in the dimming region group.

In this embodiment, the spatial filtering specifically adopts the following formula:

N_max＝max([L(j-1,i-1)L(j-1,i)L(j-1,i+1)L(j,i-1)L(j,i+1)L(j+1,i-1)L(j+1,i)L(j+1,i+1)]) (1)

SF＝(1-t_sf)*N_max (2)

L_final(j,i)＝max([L(j,i)SF]) (3)

wherein L represents a second brightness value of the dimming area 1224, t_sfA filter coefficient of 0 prestored for the display device 10<t_sf<Max is the maximum value calculated, L ═ 1_finalIs the value of the second luminance value after spatial filtering calculation.

By spatially filtering the second brightness values of the dimming regions 1224, the second brightness value of each dimming region 1224 is adjusted according to the second brightness value of the dimming region 1224 adjacent to the dimming region 1224, so that the second brightness value of each dimming region 1224 transits smoothly in space, thereby improving the image effect.

In step S23, the second luminance value is temporally filtered:

the image displayed by the display device 10 in the current display period is defined as the kth frame, and the previous frame is defined as the K-1 th frame. The light control regions 1224 are numbered by integers 1 to m.

In step S23, the temporal filtering of the second luminance value uses the following formula:

L_k(n)_new＝T_f*L_k(n)+(1-T_f)*L_k-1(n) (4)

wherein L is_k(n) represents a second luminance value of the kth frame, the

nth dimming area

1224, 1 ≦ n ≦ m, T_fFor the pre-stored temporal filter coefficients of the

display device

10, 0<T_f<＝1，L_k-1(n) a second luminance value, L, of the K-1 th frame, the nth dimming area 1224_k(n) _ new denotes a luminance value of the K-th frame, the n-th dimming area 1224, the second luminance value of which is time-filtered.

By temporally filtering the second brightness value of each dimming area 1224, the rate of change of brightness of each dimming area 1224 when displaying different frames of images can be slowed down, the continuity of adjacent frames of images can be enhanced, and the image flicker phenomenon can be reduced.

The spatially and temporally filtered luminance values of the lights emitted from the dimming areas 1224 of the light valve 1223 have a predetermined mapping relationship with the dimming driving signal for driving the light valve 1223, and the dimming driving signal output to each dimming area 1224 of the light valve 1223 can be uniquely determined according to the luminance value of the light emitted from each dimming area 1224.

The dimming driving signal is used to control a first voltage applied to the first substrate 1221 and a second voltage applied to the second substrate 1222. Each dimming area 1224 corresponds to a first voltage and a second voltage respectively. That is, the first voltage and the second voltage are applied to the dimming regions 1224 independently of each other, so that the dimming regions 1224 control the amount of light passing therethrough independently of each other, wherein the amount of light is proportional to the brightness of light.

Referring to fig. 11 again, in step S3, the step of "generating light source driving data according to the dimming driving data" includes:

step S31, obtaining a third brightness value of each light emitting region of the light source module according to the dimming driving data;

step S32, performing dark color enhancement on the third luminance value to obtain a fourth luminance value; and

step S33, performing spatial filtering and temporal filtering on the fourth luminance value to obtain the light source driving data.

As described above, the light source assembly 121 includes a plurality of light emitting areas 1216, each light emitting area 1216 corresponding to a plurality of dimming areas 1224. In step S31, the light-emitting luminance of each light-emitting region 1224 is known from the light-adjusting driving data, and the third luminance value of each light-emitting region 1216 can be obtained by averaging the light-emitting luminance of each light-emitting region 1224 corresponding to the light-emitting region 1216 or by gray histogram equalization.

In step S32, the manner of performing the dark-color enhancement on the third luminance value to obtain the fourth luminance value is substantially the same as the method described in step S22 above. In step S33, the spatial filtering and the temporal filtering are performed on the fourth luminance values in substantially the same manner as in step S23 described above.

By spatially filtering the fourth luminance values of the light-emitting regions 1216, the fourth luminance value of each light-emitting region 1216 is adjusted according to the fourth luminance value of the light-emitting region 1216 adjacent to the fourth luminance value, so that the fourth luminance values of the light-emitting regions 1216 spatially transition smoothly, and the image effect is improved.

By temporally filtering the fourth luminance value of each light-emitting region 1216, the luminance change rate of each light-emitting region 1216 when displaying different frames of images can be reduced, the continuity of adjacent frames of images can be enhanced, and the image flicker phenomenon can be reduced.

The spatially and temporally filtered luminance values of the light emitted from each light-emitting area 1216 of the light source module 121 and the values of the light source driving signals for driving the light-emitting areas 1212 have a preset mapping relationship, and the values of the light source driving signals output to each light-emitting area 1216 of the light source module 121 can be uniquely determined according to the luminance values of the light emitted from each light-emitting area 1216.

The light source driving signal is a signal for driving each light emitting source 1212 to emit light. In this embodiment, the light source driving signal is a driving current for controlling the brightness of the light emitting source 1212. The driving current is proportional to the brightness of the light source 1212 (i.e., the luminance of the light source).

Referring to fig. 11 again, in step S3, the step of generating display driving data according to the dimming driving data and the raw image data includes:

step S34, defining original gray scale values of all sub-pixels of a frame of image included in the original image data, and mapping the original gray scale values of each sub-pixel into modulation gray scale values by a function mapping method, where a gray scale difference between the modulation gray scale values is larger than the original gray scale values.

In a frame of image displayed by the display device 10, if the gray-scale values of the sub-pixels are relatively close, for example, the gray-scale values are all between 220 and 250, the difference of the gray-scale values of the sub-pixels can be enlarged by the above function mapping method, which is beneficial to further improving the image contrast.

The dimming driving data, the light source driving data, and the display driving data are all luminance values, and the display device 10 pre-stores a mapping relationship between the dimming driving data and a value of the dimming driving signal, a mapping relationship between the light source driving data and a value of the light source driving signal, and a mapping relationship between the display driving data and a value of the display driving signal, respectively. In step S4, the light sources 1212 are independently driven according to the light source driving signal, the dimming areas 1224 of the light valve 1223 are independently driven according to the dimming driving signal, and the sub-pixels of the display module 13 are independently driven according to the display driving signal.

In the display device 10 of the embodiment, in the first aspect, the light emitting brightness of each light emitting source 1212 can be independently adjusted according to the backlight brightness required by the corresponding pixels 136, when the backlight brightness required by the pixels 136 corresponding to each light emitting source 1212 is higher, the light source brightness emitted by the light emitting source 1212 is higher, and when the backlight brightness required by the pixels 136 corresponding to each light emitting source 1212 is lower, the light source brightness emitted by the light emitting source 1212 is lower, which is favorable for reducing the power consumption of the light emitting source 1212 compared with the case of keeping all the light emitting sources 1212 constantly on and the light emitting brightness unchanged.

In a second aspect, the display device 10 of the present embodiment further includes a light valve 1223 formed by a liquid crystal film, and the dimming area of the light valve 1223, which can be independently adjusted in brightness, is in the order of hundreds of thousands, and can correspond to the pixels 136 one by one. Therefore, on the basis that the light-emitting brightness of each light-emitting source 1212 is independently adjusted according to the backlight brightness required by the corresponding plurality of pixels 136, it is also possible to achieve that the light-emitting brightness of each dimming area 1224 is independently adjusted according to the backlight brightness required by the corresponding one of the pixels 136. The brightness of the backlight incident to the display module 13 is adjusted in a partitioned manner by the light source assembly 121, and then the brightness is adjusted more finely by the dimming assembly 122, so that the brightness of the backlight finally incident to the display module 13 is better matched with the brightness of the backlight required by each pixel 136, and the brightness of the image emitted by each pixel 136 is bright and dark, which can significantly improve the problem of insufficient brightness (for example, the effect of no black due to light leakage when displaying a black image) caused by light leakage of a liquid crystal layer in a display panel, and is beneficial to improving the contrast of the image displayed by the display device 10.

In the third aspect of the display device 10 of the embodiment, the light source light emitted from the light emitting source 1212 is polarized light, so that when the light modulating assembly 122 adopts the liquid crystal film as the light valve 1223, two additional polarizer layers do not need to be configured, which is beneficial to reducing the thickness of the display device 10; and the light transmittance can be improved by reducing two layers of polaroids, so that the light utilization rate is improved.

In a fourth aspect, in the driving system 15 and the driving method of the embodiment, the light source driving data, the dimming driving data, and the display driving data are obtained by calculating the original image data, and the light source driving data and the display driving data are obtained by performing corresponding processing on the dimming driving data, and an association relationship is established between the light source driving data, the dimming driving data, and the display driving data, so that the luminance of the light source light emitted from the light source assembly 121, the luminance of the backlight emitted from the dimming assembly 122, and the luminance required by each sub-pixel in the display module 13 are better matched, which is beneficial to improving the image contrast displayed by the display device 10.

Example two

Referring to fig. 13, the display device 20 of the present embodiment includes a backlight module 22, a display module 23, and a cover plate 14 stacked in sequence. The display device 20 further includes a driving system 25 electrically connecting the backlight module 22 and the display module 23.

The display device 20 of the present embodiment is different from the display device 10 of the first embodiment mainly in that: the backlight module 22 is different from the backlight module 12, and the driving system 25 is different from the driving system 15. Other structures of the display device 20 are substantially the same as those of the display device 10 in the first embodiment, and this embodiment will not be described again, and only the differences will be described in detail below.

Referring to fig. 14, the backlight module 22 includes a light source module 221 and a light modulation module 222 stacked on each other. Referring to fig. 13 and 14, the light-adjusting assembly 222 is disposed between the display module 23 and the light source assembly 221.

Referring to fig. 13, the light source assembly 221 includes a driving substrate 2211 and a plurality of light emitting sources 2212 disposed on a surface of the driving substrate 2211 close to the dimming element 222. That is, the light source module 221 in this embodiment is a direct-type light source module. The driving substrate 2211 is provided with a driving circuit (not shown). Each of the Light-Emitting sources 2212 is a Light-Emitting Diode (LED). In this embodiment, each Light-Emitting source 2212 is a mini Light-Emitting Diode (mini LED). The driving circuit is electrically connected to each light emitting source 2212, and is used for driving each light emitting source 2212 to emit light source light, which is unpolarized white light. The driving circuit can control the light intensity (or light emitting brightness) of each light emitting source 2212 respectively. That is, the light emission intensities of the light emission sources 2212 are controlled independently of each other by the drive circuit.

With continued reference to FIG. 14, the light source module 221 further includes a polarization-maintaining diffusion film 2213 and a polarization-maintaining quantum dot film 2214. The polarization maintaining diffusion film 2213 and the polarization maintaining quantum dot film 2214 are sequentially laminated in a direction in which the light source unit 221 is directed to the light control unit 222. The difference between the polarization maintaining diffusion film 1213 and the polarization maintaining quantum dot film 1214 in the first embodiment is that: since the light source light emitted from each light-emitting source 2212 in this embodiment is unpolarized light, the polarization-maintaining diffusion film 2213 and the polarization-maintaining quantum dot film 2214 do not need to be polarization-maintaining materials.

Referring to fig. 14, the light modulating component 222 is located on the emission path of the light source light for modulating the brightness of the light source light. In this embodiment, the light modulating assembly 222 includes a first substrate 2221, a second substrate 2222, and a light valve 2223 located between the first substrate 2221 and the second substrate 2222. The second substrate 2222 is located between the first substrate 2221 and the light source module 221. In this embodiment, the first substrate 2221, the second substrate 2222, and the light valve 2223 are all made of flexible materials. In other embodiments, the first substrate 2221, the second substrate 2222, and the light valve 2223 may be made of rigid materials.

The first substrate 2221 and the second substrate 2222 are light-transmitting substrates, such as glass substrates. The first substrate 2221 and the second substrate 2222 are each provided with a driving circuit (not shown). The circuit on the first substrate 2221 applies the light valve 2223 with a first voltage, and the driving circuit on the second substrate 2222 applies the light valve 2223 with a second voltage. The light valve 2223 is an electrowetting film, and can control the amount of light passing through according to a voltage difference between a first voltage and a second voltage, where the voltage difference is different and the amount of light passing through the light valve 2223 is different. The light source light may be transmitted from the first substrate 2221 to the light valve 2223. The amount of light emitted from the light valve 1223, that is, the brightness of light emitted from the light valve 1223, may be controlled by controlling the values of the first voltage and the second voltage. The light whose brightness is modulated by the light valve 1223 is transmitted from the second substrate 2222, and the light transmitted from the second substrate 2222 is defined as a backlight. The backlight is white light.

Referring to fig. 15, the light valve 2223 includes a plurality of dimming areas 2224. Each dimming area 1224 is used to adjust the brightness of light source light incident thereon. That is, the first and

second substrates

2221 and 2222 are used to apply respective first and second voltages to the respective dimming regions 2224, respectively, so that the brightness of light emitted from the respective dimming regions 2224 can be independently controlled. In this embodiment, the number of the dimming areas 2224 on the light valve 2223 can reach several hundred thousand, so that finer dimming can be achieved.

The light valves 2223 are located in the respective dimming areas 2224 in substantially the same configuration, and fig. 16 shows only a cross-sectional configuration in which the light valve 2223 is located in one of the dimming areas 2224. The light valve 2223 includes first electrodes 2225 (which may be regarded as the driving circuits on the first substrate described above) disposed on a first substrate 2221 and second electrodes 2226 (which may be regarded as the driving circuits on the second substrate described above) disposed on a second substrate 2222. The first electrode 2225 is used to provide the first voltage, and the second electrode 2226 is used to provide the second voltage. Light valve 2223 also includes a hydrophobic layer 2227, an ink layer 2228, and a water layer 2229. In a direction toward the first substrate 2221 along the second substrate 2222, a water-repellent layer 2227, an ink layer 2228, and a water layer 2229 are stacked in this order. The first electrode 2225, the second electrode 2226, the hydrophobic layer 2227, and the water layer 2229 are all transparent, and the ink layer 2228 is substantially transparent.

The ink layer 2228 can deform and/or displace according to a voltage difference between the first voltage and the second voltage. When the first voltage and the second voltage are not applied, the ink layer 2228 completely covers the hydrophobic layer 2227, and light source light incident from the second substrate 2222 side is blocked by the ink layer and cannot exit from the first substrate 2221.

Referring to fig. 17, when a voltage difference is generated between two sides of the light valve 2223 by applying the first voltage and the second voltage, the ink layer 2228 deforms and displaces to cover only a partial region of the hydrophobic layer 2227, at this time, the region of the hydrophobic layer covered by the ink layer 2228 is opaque, and the region uncovered by the ink layer 2228 is transparent, so that light source light incident from one side of the second substrate 2222 can be transmitted from the region of the hydrophobic layer 2227 uncovered by the ink layer 2228, and further transmitted from the first substrate 2221.

As can be seen from fig. 16 and 17, the area of the ink layer 2228 covering the hydrophobic layer 2227 determines the amount of light emitted from the hydrophobic layer 2227. The larger the area of the hydrophobic layer 2227 covered by the ink layer 2228, the less the amount of light that exits the hydrophobic layer 2227, and vice versa. Therefore, the amount of light emitted from the water-repellent layer 2227 can be controlled by controlling the area size of the area where the ink layer 2228 covers the water-repellent layer 2227. And the area of the ink layer 2228 covering the hydrophobic layer 2227 depends on the voltage difference between the first voltage and the second voltage. Therefore, the amount of light emitted from the water-repellent layer 2227 can be controlled by controlling the voltage difference between the first voltage and the second voltage.

As described above, the light valve 2223 includes the plurality of dimming areas 2224. In this embodiment, the light quantity emitted from each dimming area 2224 can be independently controlled, that is, the backlight brightness emitted from each dimming area 2224 can be independently controlled, by independently controlling the voltage difference between the first voltage and the second voltage in each dimming area 2224.

Referring to fig. 18, the display module 23 is substantially the same as the display module 13 in the first embodiment. The display module 23 includes a plurality of pixels 236.

Similar to the embodiment, each light emitting region 2216 corresponds to a plurality of adjacently arranged dimming regions 2224. That is, the light emitted from each light emitting region 2216 is incident on the plurality of dimming regions 2224 corresponding to the light emitting region 2216. That is, the orthographic projection of each light emitting region 2216 on the light valve 2223 overlaps with the plurality of adjacently arranged dimming regions 2224. The luminance of the source light emitted from each light emitting region 2216 is determined according to the luminance required by the plurality of adjacently arranged dimming regions 2224 corresponding thereto.

Each dimming area 2224 on the light valve 2223 corresponds to a plurality of pixels 236 in the display module 23. The light emitted from each dimming area 2224 is incident on the plurality of pixels 136 corresponding to the dimming area 2224. That is, the orthographic projection of each dimming area 2224 on the display module 23 overlaps with the plurality of adjacently arranged pixels 236 on the display module 23. The brightness of the light emitted by each dimming area 2224 is determined according to the backlight required by the plurality of pixels 236 to which it corresponds.

In this embodiment, the number of pixels 236 corresponding to each dimming area 2224 is the same, and the number of dimming areas 2224 corresponding to each light-emitting area 2216 is the same.

Referring to fig. 19, the main differences between the driving system 25 and the driving system 15 are: the control chip 152 is replaced by a Field Programmable Gate Array (FPGA) chip 251, and a first timing controller 252 and a second timing controller 253 electrically connected to the FPGA chip 251, respectively. The first timing controller 252 is electrically connected to the display driving chip 153, and the second timing controller 253 is electrically connected to the dimming driving chip 155. The function realized by the FPGA chip, the first timing controller 252 and the second timing controller 253 is basically the same as the function realized by the control chip, and the data processing mode is also the same.

In this embodiment, in the driving system 15 shown in fig. 9, the dimming data obtaining module 1521, the light source data obtaining module, and the display data obtaining module are integrated on the FPGA chip 251, and the Over Driver, the DEMURA, the Gamma, and the mini-LVDS/P2P TX are integrated on the first timing controller 252, and the Over Driver, the Mapping Function, the Line buffer, and the mini-LVDS/P2P TX are integrated on the second timing controller 253. Since the FPGA chip 251 is a function-editable chip, it is more flexible to use than the function-customized control chip 152. The control chip 152 of the first embodiment has a lower cost than the FPGA chip 251.

Referring to fig. 20, in an alternative embodiment, the electrical signals generated by the photosensitive layer 16 are transmitted to the system-on-chip 151 via the FPGA chip for processing, and the FPGA chip is a device combining software and hardware (hardware circuit loads software program), so that the data processing speed is faster.

The operation principle of the driving system 25 shown in fig. 19 and 20 is similar to that of the driving system 15 described in the first embodiment, and is not described again.

The driving system 25 in the present embodiment can also be applied to the display device 10 in the first embodiment, instead of the driving system 15 in the first embodiment; the driving system 15 in the first embodiment can also be applied to the display device 20 of the present embodiment instead of the driving system 25 in the present embodiment. The driving method as described in the first embodiment can also be applied to the display device 20 as described in this embodiment, and specifically, the driving method as described in the first embodiment can also be applied to the driving system 25 as described in this embodiment.

The display device 20 of the present embodiment can achieve all the advantages of the display device 10 as described in the first embodiment. On the basis, the display device 20 in the embodiment does not need to provide polarized light as light source light, and the backlight module 22 can omit a polarization recycling optical film, thereby facilitating the simplification of the device structure, reducing the overall thickness of the device, increasing the light penetration rate, and improving the light energy utilization rate.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not used as limitations of the present application, and that suitable modifications and changes of the above embodiments are within the scope of the claims of the present application as long as they are within the spirit and scope of the present application.

Claims

1. A display device, comprising:

a light source assembly for emitting light source light;

2. The display device according to claim 1, wherein the display module comprises a plurality of pixels;

3. The display device of claim 2, wherein the orthographic projection of each dimming region on the display module overlaps the same number of pixels on the display module.

4. The display device according to any one of claims 1 to 3, wherein the light source assembly comprises a plurality of light emitting regions, and the brightness of the light source light emitted by each light emitting region is independently controlled;

5. The display device of claim 4, wherein the orthographic projection of each light emitting region on the light valve overlaps a same number of dimming regions on the light valve.

6. A display device, comprising:

7. The display apparatus of claim 6 wherein the light valve is a liquid crystal film and the source light is polarized.

8. The display device of claim 6, wherein the light valve is an electrowetting film and the source light is unpolarized light.

9. The display device according to any one of claims 6 to 8, wherein the display module comprises a plurality of pixels;

10. The display device of claim 9, wherein the orthographic projection of each dimming region on the display module overlaps the same number of pixels on the display module.

11. The display device according to any one of claims 6 to 8, wherein the light source assembly comprises a plurality of light emitting regions, and the brightness of the light source light emitted by each light emitting region is independently controlled;

12. The display device of claim 11, wherein a orthographic projection of each light emitting region on the light valve overlaps a same number of dimming regions on the light valve.

13. A display driving method is applied to a display device, and the display device comprises a backlight module and a display module; the display driving method is characterized by comprising the following steps:

receiving original image data;

acquiring dimming driving data according to the original image data;

14. The display driving method of claim 13, wherein the backlight module comprises a light valve, and the light valve comprises a plurality of dimming regions; the step of obtaining dimming driving data according to the original image data specifically includes:

15. The display driving method according to claim 13, wherein the backlight module comprises a light source assembly including a plurality of light-emitting areas; the step of obtaining light source driving data according to the dimming driving data specifically includes:

16. The display driving method according to claim 13, wherein the display module comprises a plurality of sub-pixels, and the original image data comprises an original gray-scale value of each sub-pixel; the step of obtaining display driving data according to the dimming driving data and the original image data specifically includes:

17. A driving system is applied to a display device, and the display device comprises a backlight module and a display module; characterized in that the drive system comprises:

18. A display device, comprising:

a backlight module;

a display module; and

a drive system; the drive system includes: