CN110873982A

CN110873982A - Digital backlight source system and control method thereof, liquid crystal display device and control method thereof

Info

Publication number: CN110873982A
Application number: CN201911186380.1A
Authority: CN
Inventors: 林荣镇; 严丞辉
Original assignee: Beijing Jiayi Technology Co Ltd
Current assignee: Beijing Jiayi Technology Co Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-03-10

Abstract

The invention discloses a digital backlight source system and a control method thereof, a liquid crystal display device and a control method thereof, wherein the digital backlight source system comprises: a backlight source including a light emitting surface; the light control structure is arranged on one side of the light emitting surface of the backlight source, comprises a plurality of different dimming areas and is used for adjusting the light emitted by the backlight source so as to enable the brightness of the light emitted by the backlight source after penetrating through the light control structure to be uniform. The digital backlight system performs regional adjustment on light emitted by the backlight through the light control structure with the plurality of different dimming regions, so that the brightness of the light emitted by the backlight after penetrating through the light control structure is uniform, the problem of nonuniform display caused by nonuniform light emission of the backlight is avoided, and the uniformity of display is improved.

Description

Digital backlight source system and control method thereof, liquid crystal display device and control method thereof

Technical Field

The present invention relates to the field of display technologies, and in particular, to a digital backlight system, a method and an apparatus for controlling the digital backlight system, a liquid crystal display apparatus, a method and an apparatus for controlling the liquid crystal display apparatus, an electronic device, and a storage medium.

Background

Since a Liquid Crystal Display (LCD) has the advantages of thin body, space saving, power saving, no high temperature, no electromagnetic radiation, long service life, soft and non-eye-hurting picture, etc., it is widely used in Display devices such as LCD tvs, projectors, mobile terminals, computers, notebooks, vehicles, instruments and meters. However, in the course of actual use, a problem of display unevenness (mura) of the display screen often occurs.

Disclosure of Invention

Based on this, embodiments of the present invention provide a digital backlight system, a control method, a control device, an electronic device, and a readable storage medium for the digital backlight system, a liquid crystal display device, a control method, a control device, an electronic device, and a readable storage medium for the liquid crystal display device, so as to solve the problem of non-uniform display of a liquid crystal display screen in the prior art.

According to a first aspect, an embodiment of the present invention provides a digital backlight system, including: a backlight source including a light emitting surface; the light control structure is arranged on one side of the light emitting surface of the backlight source, comprises a plurality of different dimming areas and is used for adjusting the light emitted by the backlight source so as to enable the light emitted by the backlight source to penetrate through the light with uniform brightness after the light control structure.

Optionally, the backlight includes only light emitting source devices and no optical film.

Optionally, the light control structure is a monochrome liquid crystal panel.

Optionally, the size of the monochrome liquid crystal panel is not smaller than the size of the backlight.

According to a second aspect, an embodiment of the present invention provides a liquid crystal display device, including the digital backlight system according to any one of the first aspect of the present invention, the liquid crystal display device further including: and the color liquid crystal panel is arranged on one side of the light-emitting surface of the backlight source.

Optionally, if the light control structure is a monochrome liquid crystal panel, the monochrome liquid crystal panel is located between the color liquid crystal panel and the backlight source.

Optionally, the size of the monochrome liquid crystal panel is the same as that of the color liquid crystal panel, and the number of pixels of the monochrome liquid crystal panel is not greater than that of the color liquid crystal panel.

Optionally, the light control structure is a transparent structure, and the transparent structure is located between the color liquid crystal panel and the backlight source; and/or the transparent structure is positioned on one side of the color liquid crystal panel far away from the backlight source.

According to a third aspect, an embodiment of the present invention provides a method for controlling a digital backlight system, which is applied to the digital backlight system according to any one of the first aspect of the present invention, and includes: acquiring compensation data of light emitted by a backlight source, wherein the compensation data is used for representing brightness nonuniformity of the light emitted by the backlight source; and adjusting the light control structure according to the compensation data so that the brightness of the light emitted by the backlight source after penetrating through the light control structure is uniform.

Optionally, the step of acquiring compensation data of light emitted by the backlight source includes: acquiring brightness data of light emitted by a backlight source; determining the compensation data from the brightness data.

Optionally, the step of determining the compensation data according to the brightness data includes: generating a brightness map according to the brightness data; and determining compensation data according to the brightness map, and sending the compensation data to the liquid crystal display device.

Optionally, the luminance data is a luminance value directly emitted by the backlight source; or the brightness data is the brightness value of the light emitted by the backlight source after the light penetrates through the light control structure.

Optionally, when the light control structure is a monochrome liquid crystal panel, the adjusting the light control structure according to the compensation data includes: determining a compensation value of each pixel in the light control structure according to the compensation data; the compensation value is compensated to each pixel in the light control structure.

According to a fourth aspect, the present invention provides a method for controlling a liquid crystal display device, which is applied to the liquid crystal display device according to any one of the second aspects of the present invention, and includes the method for controlling the digital backlight system according to any one of the third aspects of the present invention; the control method of the liquid crystal display device further includes: video input data is acquired.

Optionally, when the light control structure is a monochrome liquid crystal panel, the adjusting the light control structure according to the compensation data includes: and controlling the color liquid crystal panel according to the video input data, and controlling the monochrome liquid crystal panel according to the video input data and the compensation data.

Optionally, the luminance data is a luminance value of light emitted by the backlight source after the light passes through the light control structure and a luminance value of the color liquid crystal panel.

Optionally, before the step of acquiring the compensation data of the light emitted by the backlight, the method further includes: a compensation start signal for starting luminance compensation is acquired.

According to a fifth aspect, an embodiment of the present invention provides a control device for a digital backlight system, including: the first acquisition module is used for acquiring compensation data of light emitted by the backlight source, and the compensation data is used for representing brightness nonuniformity of the light emitted by the backlight source; and the first processing module is used for adjusting the light control structure according to the compensation data so as to enable the brightness of the light emitted by the backlight source after penetrating through the light control structure to be uniform.

Optionally, the first obtaining module includes: a first acquisition unit configured to acquire luminance data of light emitted from a backlight; a first processing unit for determining the compensation data from the luminance data.

Optionally, the first processing unit includes: the first processing subunit is used for generating a brightness map according to the brightness data; and the second processing subunit is used for determining compensation data according to the brightness map and sending the compensation data to the liquid crystal display device.

Optionally, when the light control structure is a monochrome liquid crystal panel, the first processing module includes: a second processing unit for determining a compensation value for each pixel in the light control structure based on the compensation data; a third processing unit for compensating the compensation value to each pixel in the light control structure.

According to a sixth aspect, an embodiment of the present invention provides a control apparatus for a liquid crystal display apparatus, including: the control device of a digital backlight system according to any one of the fifth aspects of the present embodiments, the control device of a liquid crystal display device further includes: and the second acquisition module is used for acquiring the video input data.

Optionally, when the light control structure is a monochrome liquid crystal panel, the first processing module includes: and the fourth processing unit is used for controlling the color liquid crystal panel according to the video input data and controlling the single-color liquid crystal panel according to the video input data and the compensation data.

Optionally, the control device of the liquid crystal display device further includes: and the third acquisition module is used for acquiring a compensation starting signal for starting brightness compensation.

According to a seventh aspect, an embodiment of the present invention provides an electronic device, including: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the method for controlling the digital backlight system according to any one of the third aspect of the present invention or execute the method for controlling the liquid crystal display device according to any one of the fourth aspect of the present invention.

According to an eighth aspect, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the method for controlling a digital backlight system according to any one of the third aspect of the present invention or the method for controlling a liquid crystal display device according to any one of the fourth aspect of the present invention.

The technical scheme of the invention has the following advantages:

1. the invention provides a digital backlight system, comprising: a backlight source including a light emitting surface; the light control structure is arranged on one side of the light emitting surface of the backlight source, comprises a plurality of different dimming areas and is used for adjusting the light emitted by the backlight source so as to enable the light emitted by the backlight source to penetrate through the light with uniform brightness after the light control structure. The digital backlight system performs regional adjustment on light emitted by the backlight through the light control structure with the plurality of different dimming regions, so that the brightness of the light emitted by the backlight is consistent after the light penetrates through the light control structure, and the problem of uneven display caused by uneven light emission of the backlight is avoided.

2. The invention provides a control method of a digital backlight system, which comprises the following steps: acquiring compensation data of light emitted by a backlight source, wherein the compensation data is used for representing brightness nonuniformity of the light emitted by the backlight source; and adjusting the light control structure according to the compensation data so that the brightness of the light emitted by the backlight source after penetrating through the light control structure is uniform. According to the control method, the compensation data of the light emitted by the backlight source is firstly acquired, then the light control structure is adjusted according to the compensation data, and the light emitted by the backlight source is regionally adjusted through the light control structure with a plurality of different dimming regions, so that the brightness of the light emitted by the backlight source is consistent after the light penetrates through the light control structure, and the problem of uneven display caused by uneven light emission of the backlight source is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of one particular example of a luminescent light source and optical film in the prior art;

FIG. 2 is a schematic diagram of a specific example of a digital backlight system according to an embodiment of the invention;

FIG. 3 is a schematic diagram of another specific example of a digital backlight system according to an embodiment of the invention;

fig. 4 is a schematic view of a specific example of a liquid crystal display device of an embodiment of the present invention;

fig. 5 is a schematic view of another specific example of a liquid crystal display device of the embodiment of the invention;

FIG. 6 is a schematic view showing a specific example of a related art liquid crystal display device according to an embodiment of the present invention;

fig. 7 is a schematic view of another specific example of a liquid crystal display device of the embodiment of the invention;

fig. 8 is a schematic view of another specific example of a liquid crystal display device of the embodiment of the invention;

fig. 9 is a flowchart of a specific example of a control method of the digital backlight system according to the embodiment of the present invention;

fig. 10 is a flowchart of another specific example of a control method of a digital backlight system according to an embodiment of the present invention;

fig. 11 is a flowchart of another specific example of a control method of a digital backlight system according to an embodiment of the present invention;

fig. 12 is a flowchart of a specific example of a control method of a liquid crystal display device according to an embodiment of the present invention;

fig. 13 is a flowchart of another specific example of a control method of a liquid crystal display device according to an embodiment of the present invention;

fig. 14 is a flowchart of another specific example of a control method of a liquid crystal display device according to an embodiment of the present invention;

FIG. 15 is a diagram illustrating an LCD device in a method for controlling the LCD device according to an embodiment of the present invention;

fig. 16 is a schematic diagram showing a specific control process of the control method of the liquid crystal display device according to the embodiment of the invention;

fig. 17 is a schematic diagram of luminance data of each pixel on the monochrome liquid crystal panel obtained in the control method of the liquid crystal display device according to the embodiment of the invention;

FIG. 18 is a diagram illustrating compensation data obtained after compensation operation in the control method of the LCD device according to the embodiment of the present invention;

FIG. 19 is a diagram illustrating the compensated luminance of the LCD panel in the control method of the LCD device according to the embodiment of the present invention;

fig. 20 is a block diagram showing a specific example of a control device of the digital backlight system according to the embodiment of the present invention;

fig. 21 is a block diagram of a specific example of a control device of the liquid crystal display device of the embodiment of the present invention;

fig. 22 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The inventor finds that the root cause of the uneven Light emission of the backlight source is the manufacturing process difference of each Light emitting device on the backlight source of the liquid crystal display, for example, a backlight Unit (BLU) of the LED liquid crystal display comprises a plurality of LED lamps, and due to the individual difference of the LED lamps (such as the difference of the wavelength of an emission spectrum, the difference of Light emitting efficiency, the difference of half-peak width of the emission spectrum, and the like), the assembly precision, the Light source diffusion unevenness, the distance between adjacent LED lamps, and the like, the Light emitting brightness of the LED is uneven, and further the display uniformity of the LED liquid crystal display is poor, and the problem of uneven display occurs. Similarly, in an LCD liquid crystal display using a Cold Cathode Fluorescent Lamp (CCFL) or a Hot Cathode Fluorescent Lamp (HCFL) as a light source, although a small number of CCFLs or HCFLs are used, there is also a difference between the lamps, and the LCD backlight has non-uniform light emission, which leads to a problem of non-uniform display. In the prior art, an optical film with better quality is usually selected to reduce the unevenness of the liquid crystal display screen, specifically, a multilayer optical film is disposed above a light source (such as an LED lamp, a cold cathode fluorescent lamp, etc.) to make the light emitted by the light source more uniform, as shown in fig. 1, a light source 112 is a direct type light source, and four layers of optical films 111 are disposed above the light source. These optical films include light directing films, diffuser films, and the like; the light guide film improves the brightness of the panel by guiding the scattering direction of light to ensure the uniformity of the panel brightness; the diffusion film adopts the phenomenon that light rays generate a plurality of refraction, reflection, scattering and the like when the light rays pass through media with different refractive indexes, so that the optical diffusion effect is caused, and the effect of uniform light is achieved by converting a light-emitting light source into a surface light source to enable the light rays to form diffusion. Although the optical film can reduce the non-uniformity of the light source to a certain extent, the manufacturing process error, the assembly error and the like of the optical film cause the uniformity of the optical film to the light source to be greatly different from the expected effect in design, for example, because the diffusion film in the optical film is an optical film with high transparency, when the optical film is coated, the local part has a little uneven thickness, the defect of uneven brightness on the film can be immediately seen by eyes, and the thickness error given in the technical specification of the general diffusion film is +/-5%; in addition, the optical film is difficult to be adaptively adjusted after being assembled, and the uniformity of the light-emitting source cannot be well ensured; even if the uniformity of the light-emitting light source can be adjusted by adding a new optical film or changing the thickness, the material and the like of the film layer in the subsequent processing production, the adoption of the optical diffusion adjustment mode still has great control randomness, the uniformity of each panel and the uniformity among different panels are difficult to ensure, and the adjustable precision is also limited; these factors all cause the display device to still have the problem of uneven display.

An embodiment of the present invention provides a digital backlight system, as shown in fig. 2, including: backlight 1, light control structure 2.

The backlight 1 includes a light exit surface. The light emitted from the light emitting surface of the backlight 1 is irradiated onto a color liquid crystal panel of the liquid crystal display device for displaying pictures on the color liquid crystal panel.

LCD displays can be classified into three types of LCD display devices, i.e., transmissive, reflective, and transflective, according to the light source used for display. This is not limited in this embodiment, and may be selected as needed.

In one embodiment, the backlight source may be an LCD backlight or an LED backlight. The LCD backlight may be a Cold Cathode Fluorescent Lamp (CCFL) or a Hot Cathode Fluorescent Lamp (HCFL). The LED backlight may be direct type or side type. Of course, in other embodiments, the backlight may also be other types of backlights, such as an EL backlight, or a mini LED backlight, or a micro LED backlight, etc. The present embodiment is only illustrative and not limited thereto.

The light control structure 2 is disposed on one side of the light emitting surface of the backlight 1, and includes a plurality of different dimming regions for adjusting light emitted from the backlight so that the brightness of the light emitted from the backlight after passing through the light control structure is uniform.

The light control structure 2 is disposed on one side of the light emitting surface, specifically, above the light emitting surface of the backlight source, and emits light on the light emitting surface of the backlight source, and then the light control structure is transmitted, and a plurality of different dimming regions on the light control structure can perform regional dimming on the light emitted by the backlight source through the transmittance of the light control structure, that is, local dimming, so that the light transmitted through the light control structure is uniform. Although the brightness of the light emitted from the light-emitting surface of the backlight source is uneven, the brightness of the light emitted after the light penetrates through the light control structure is consistent by adjusting the plurality of dimming areas on the light control structure, so that the uniformity of the brightness is ensured.

It should be noted that, the brightness uniformity or the brightness consistency in this embodiment may be the brightness is completely the same, or the brightness error is within a preset error allowable range, a specific preset error allowable range may be ± 0.1%, or ± 1%, and the specific numerical value in this embodiment is not limited at all and may be set reasonably as required.

According to the digital backlight system, the light emitted by the backlight is subjected to regional adjustment through the light control structure with the plurality of different dimming regions, so that the brightness of the light emitted by the backlight after penetrating through the light control structure is uniform, the problem of uneven display caused by uneven light emission of the backlight is avoided, and the uniformity of display is improved.

In one embodiment, the backlight includes only light emitting source devices, not optical films; that is, only include the light emitting source device, and need not the optical film, this is because the light control structure can accurately adjust the transmissivity that the backlight passes through the light control structure, guarantees that the homogeneity of the light after passing through the light control structure is better, and can also reduce the thickness of backlight, makes the whole thickness of display device lighter and thinner. In addition, the cost of the optical film (such as a light guide plate and a diffusion film) occupies most of the cost of the whole backlight source, and the reduction of the use of the optical film can greatly reduce the production cost. In addition, each layer of optical film cannot completely transmit light, so that transmission loss is inevitably caused when the light transmits through each layer of optical film, although the more the number of the optical films is, the better the uniformity of the backlight source is, the light transmission loss is increased, the larger the brightness loss is, the maximum brightness of the display is reduced, and the backlight source without the optical film in the embodiment can obviously reduce the brightness loss, improve the maximum brightness of the display and improve the contrast; when the same display brightness is needed, the transmission loss of the optical film is avoided, so that the brightness of the light-emitting light source can be reduced, the power consumption of the light-emitting light source is reduced, the power consumption of the liquid crystal display device is further reduced, and the low power consumption is realized. Of course, in other embodiments, the backlight source may also include a light emitting source device and an optical film, where the optical film performs uniformity adjustment on light emitted from the light emitting source device in an optical diffusion manner, and then performs digital transmittance adjustment on light emitted from the backlight source through the light control structure; the double uniformity adjustment enables light emitted by the backlight source to be more uniform after penetrating through the light control structure, and the uniformity adjustment of the optical structure is simpler, more convenient and easier to operate after the uniformity adjustment of the optical film; the device can be reasonably arranged according to the requirement in practical application.

In an embodiment, the light control structure may be a monochrome liquid crystal panel, as shown in fig. 3, the monochrome liquid crystal panel includes a plurality of pixels 21, each of which can individually adjust light transmittance, and adjust liquid crystal transmittance by controlling a rotation angle of liquid crystal molecules in the pixels, so that light transmittance of the pixels is different. The monochromatic liquid crystal panel is arranged between the color liquid crystal panel and the backlight source, so that the uniformity of display is improved, and normal color display is not influenced; and the manufacturing process of the monochromatic liquid crystal panel is similar to that of the color liquid crystal panel, the manufacturing process is mature, the reliability is high, the yield is high, the production cost is reduced, and the excess of the productivity of a panel factory is avoided. In addition, even a mini LED backlight with smaller LED lamp size is difficult to realize the dimming at pixel level by adjusting the brightness of the LED lamps, because the size of each LED lamp in the mini LED is above 100um and there is a space between the LED lamps, there cannot be an LED lamp below each color liquid crystal panel pixel, so the dimming at pixel level cannot be realized; the monochrome liquid crystal panel in the embodiment realizes pixel-level dimming by controlling each pixel, has high adjustability, can achieve uniform display at the pixel level, and remarkably improves the uniformity of display. In addition, the light is not required to be homogenized by a plurality of laminated optical films, so that the thickness of the display device, particularly the thickness of a direct-type liquid crystal display device, can be greatly reduced.

In one embodiment, the monochrome liquid crystal panel may include a liquid crystal layer and a TFT layer controlling rotation of liquid crystal in the liquid crystal layer, and specifically, an electrical signal such as a voltage or a current may be input to a TFT circuit of the TFT layer, thereby controlling liquid crystal transmittance. The manufacturing steps of the single-color liquid crystal panel in the embodiment are similar to those of the color liquid crystal panel in the prior art, and the step of a color filter is omitted in the process of manufacturing the color liquid crystal panel, so that the single-color liquid crystal panel in the embodiment can be obtained, and the manufacturing process of the single-color liquid crystal panel is simple and low in cost.

Specifically, the monochrome liquid crystal panel may be a black-and-white liquid crystal panel, or a single-color liquid crystal panel, such as a red liquid crystal panel, a yellow liquid crystal panel, or a cyan liquid crystal panel, and the like.

In this embodiment, a structure formed by a backlight that does not include an optical film and a monochrome liquid crystal panel is referred to as a Digital backlight Unit (Digital Back Light Unit), and specifically, backlight adjustment at a pixel level can be realized by hardware and an algorithm.

In an embodiment, the size of the monochrome liquid crystal panel is not smaller than that of the backlight source, and the monochrome liquid crystal panel is ensured to be arranged on the whole backlight source, that is, the monochrome liquid crystal panel can cover the whole backlight source, so that the monochrome liquid crystal panel can effectively adjust the pixel level of the whole backlight source. Specifically, the size of the monochromatic liquid crystal panel is the same as that of the backlight source, so that the size of the liquid crystal display device can be reduced, and the production cost can be reduced. Of course, in other embodiments, the size of the monochrome liquid crystal panel may be larger than that of the backlight source, and this embodiment is only described schematically, and is not limited thereto.

In an embodiment, the light control structure may also be a transparent structure, in a specific example, the transparent light control structure may be a grid type transparent conductive film, different grids correspond to different dimming regions, and the transmittance of the conductive film is changed by controlling the voltage of the conductive film, where the higher the voltage is, the higher the transmittance of the conductive film is, and conversely, the lower the voltage is, the lower the transmittance of the conductive film is; of course, in other embodiments, the current control may be performed, and the setting may be reasonable as required. In other embodiments, the transparent light control structure may also be a transparent conductive film, an electrowetting film, etc., and this embodiment is only illustrative and not limited thereto.

The embodiment also provides a liquid crystal display device, which comprises the digital backlight source system and a color liquid crystal panel arranged on one side of the light-emitting surface of the backlight source.

The liquid crystal display device in this embodiment may be any device having a display function, such as a mobile phone, a tablet, a notebook, a liquid crystal television, or a vehicle-mounted display screen.

In one embodiment, the color liquid crystal panel may include a color filter, a liquid crystal layer, and a TFT layer; of course, in other embodiments, the color liquid crystal panel may further include a glass substrate, a black matrix, a polarizer, and the like. The present embodiment is only illustrative and not limited thereto.

In one embodiment, the color filter on the color liquid crystal panel includes three colors of red, green and blue, if the light emitted by the backlight source is white light, the light transmitted through the color liquid crystal panel has three colors of red light, green light and blue light, respectively, and color picture display is realized through different ratios of the three colors; of course, in other embodiments, the color filter may be of other colors, such as magenta, yellow, etc., and may be set as needed.

In an embodiment, if the light control structure is a monochrome liquid crystal panel, the light control structure is located between the color liquid crystal panel and the backlight, as shown in fig. 4, the light emitting surface side of the backlight 1 is sequentially stacked with the light control structure 2 and the color liquid crystal panel 3, that is, the backlight is located at the lowest position, the light control structure is located above the light emitting surface of the backlight, and the color liquid crystal panel is located above the light control structure; of course, in other embodiments, the color liquid crystal panel may be positioned between the backlight and the light management structure; the embodiment is only schematically illustrated, and is not limited thereto, and may be reasonably arranged as required in practical application.

In one embodiment, the size of the monochrome liquid crystal panel is the same as that of the color liquid crystal panel, and the number of pixels of the monochrome liquid crystal panel is not more than that of the color liquid crystal panel; the monochromatic liquid crystal panel is positioned between the color liquid crystal panel and the backlight plate, so that light transmitted from the monochromatic liquid crystal panel can reach the whole color liquid crystal panel, local dimming at the pixel level can be realized for each pixel on the monochromatic liquid crystal panel, and the uniform brightness of the light reaching the color liquid crystal panel is ensured; meanwhile, the monochrome liquid crystal panel and the color liquid crystal panel have the same size, so that the backlight transmission loss can be reduced to the greatest extent, the display brightness is improved, and the contrast is increased. Of course, in other embodiments, the size of the monochrome liquid crystal panel may be larger than that of the color liquid crystal panel, so that the brightness uniformity of the light reaching the color liquid crystal panel can be well ensured.

In a specific example, the number of pixels of the monochrome liquid crystal panel is smaller than that of pixels of the color liquid crystal panel, so that the manufacturing difficulty of the monochrome liquid crystal panel can be further reduced, and the yield is improved. Specifically, one pixel on the monochrome liquid crystal panel may correspond to a plurality of pixels on the color liquid crystal panel, for example, a pixel on one monochrome liquid crystal panel corresponds to a pixel on 4 (2 × 2 block) color liquid crystal panels, or a pixel on one monochrome liquid crystal panel corresponds to a pixel on 8 (4 × 2 block or 2 × 4 block) color liquid crystal panels, and the specific correspondence relationship may be set reasonably according to the liquid crystal display device.

In another specific example, the number of pixels of the monochrome liquid crystal panel is equal to the number of pixels of the color liquid crystal panel, that is, the pixels of the monochrome liquid crystal panel and the pixels of the color liquid crystal panel correspond to each other one by one, so that the adjustment accuracy of uniformity is increased, and accordingly, the manufacturing cost is increased. In practical application, the size and the number of pixels of the monochromatic liquid crystal panel are reasonably set by comprehensively considering the influence of various factors.

Above-mentioned liquid crystal display device includes monochromatic liquid crystal display panel and colored liquid crystal display panel, and display device's picture display receives two liquid crystal display panel's control, and when showing black picture, the transmissivity of the last pixel of monochromatic liquid crystal display panel falls to minimum, and then reduces the light intensity that reaches colored liquid crystal display panel for black picture is darker, appears phenomena such as halo and yellowing when having avoided black picture, can realize millions: a contrast of 1, significantly improving the black-white contrast, as shown in fig. 5; in addition, the light transmittance of the whole surface of the backlight source can be controlled by opening/closing the pixels on the single-color liquid crystal panel, and the light can be adjusted according to the pixel units, so that the adverse effects of a halo phenomenon, motion blur, slow response speed and the like can be avoided, and the image quality can be improved. Meanwhile, the improvement of large contrast and image quality enables the display effect of the liquid crystal display device to be comparable to that of the OLED display device, and the aging defect of the OLED display device does not exist.

In the manufacturing process of the color liquid crystal panel, it is difficult to avoid the color liquid crystal panel from generating defects, bright spots occur when a black picture is displayed, and human eyes can easily identify the bright spots, as shown in fig. 6, the liquid crystal display device in the prior art comprises a backlight source 1 and a color liquid crystal panel 3, when a defective pixel 31 occurs on the color liquid crystal panel 3, the liquid crystal at the position cannot be effectively controlled to be turned off when the black picture is displayed, and light rays still penetrate to form the bright spots; if the bright dot pixels are not processed, the entire color liquid crystal panel cannot be used, which causes great waste and seriously reduces the yield of the color liquid crystal panel. In the prior art, the processing mode of the poor color liquid crystal panels is to repair pixels corresponding to the positions of bright spots by adopting a laser repair method, so that the bright spots become dark, the operation is complex and the cost is high; moreover, the method has a great defect that laser repair is an irreversible process, pixels repaired by laser are always in a black state and cannot change the display state, and although individual pixels are in a normally dark state, the individual pixels are not easy to be identified by human eyes, but the display effect is still reduced, and the defect is more obvious particularly in a display device with high quality of pictures.

However, in the liquid crystal display device of the present embodiment, the transmittance of the pixels in the single-color liquid crystal panel is controlled, so that the positions corresponding to the bright points in the color liquid crystal panel are in a black state when displaying a black image, and normal display can be realized when displaying other images. Specifically, when the color liquid crystal panel displays a black picture, the pixels on the monochrome liquid crystal panel corresponding to the bright spots on the color liquid crystal panel are turned off, so that light emitted by the backlight source does not penetrate through the monochrome liquid crystal panel, and the color liquid crystal panel can realize pure black picture display, as shown in fig. 7, the display device comprises a backlight source 1, a light control structure 2 (the light control structure is a monochrome liquid crystal panel) and a color liquid crystal panel 3, and the pixels 31 on the color liquid crystal panel 3 realize black display by controlling the turning off of the pixels on the monochrome liquid crystal panel, so that the whole picture realizes pure black display; when the display device displays other color pictures, the transmittance of the pixels of the single-color liquid crystal panel is controlled to ensure that light emitted by the backlight can effectively penetrate, so that reversible adjustment is realized; the monochromatic liquid crystal panel can effectively avoid the defects of the color liquid crystal panel, the control method is simple and convenient, the operability is high, the repair cost is low, and the yield of the display device is obviously improved.

In an embodiment, if the light control structure is a transparent structure, the transparent structure may be located between the color liquid crystal panel and the backlight source, so as to ensure uniformity of light incident on the color liquid crystal panel and improve uniformity of display; or on the side of the color liquid crystal panel away from the backlight source, as shown in fig. 8, the uniformity of the light emitted from the color liquid crystal panel is ensured, and the uniformity of the display is improved; the light control structure positioned between the color liquid crystal panel and the backlight source ensures the uniformity of light incident on the color liquid crystal panel, and the light control structure positioned on one side of the color liquid crystal panel far away from the backlight source ensures the uniformity of light emitted from the color liquid crystal panel, so that the display uniformity of the liquid crystal display device is ensured to the greatest extent.

The embodiment of the present invention further provides a method for controlling a digital backlight system, as shown in fig. 9, which is applied to the digital backlight system of this embodiment, and includes steps S1-S2.

Step S1: and acquiring compensation data of the light emitted by the backlight source, wherein the compensation data is used for representing the brightness nonuniformity of the light emitted by the backlight source.

In an embodiment, a ccd (charge coupled device) camera may be used to first obtain a brightness value of light emitted by a backlight source, compare the brightness value with a preset brightness value to obtain a difference value therebetween, and use the difference value as compensation data.

In another embodiment, the compensation data may be stored in the storage device in advance, and the compensation data may be read directly from the memory when the backlight modulation is performed. The storage device may be a flash memory that does not lose Data after power off, a low-cost ddr (double Data rate) memory, or an SRAM integrated in a chip, and the present embodiment is only schematically described, and is not limited thereto.

Step S2: and adjusting the light control structure according to the compensation data so that the brightness of the light emitted by the backlight source after penetrating through the light control structure is uniform.

In an embodiment, the transmittance of the light control structure is adjusted according to the compensation data, so that the brightness values of the light after passing through the light control structure are kept consistent, the uniformity of the light emitted by the backlight source is ensured, and the problem of uneven display caused by uneven light emitted by the backlight source is avoided.

Specifically, taking the LED backlight as an example for detailed description, the LED backlight is composed of a plurality of LED lamps, and a gap is formed between adjacent LED lamps, so that even if the luminance brightness of each LED lamp is consistent, it is difficult to ensure uniform luminance at each position on the LED backlight due to factors such as diffusion of light sources, and thus adjusting the luminance value of the LED lamp cannot ensure the uniformity of the light emission of the LED backlight; in this embodiment, through increasing the regulation that carries out the luminousness when light that light-operated structure sent the backlight sees through light-operated structure, the regional light modulation that adjusts luminance, also local light modulation that a plurality of differences on the light-operated structure are regional can be carried out the backlight, can guarantee that the luminance value on whole display area keeps unanimous behind the light-operated structure, and then has improved the display uniformity.

According to the control method of the digital backlight system, the compensation data of the light emitted by the backlight source is firstly acquired, then the light control structure is adjusted according to the compensation data, and the light emitted by the backlight source is regionally adjusted through the light control structure with a plurality of different dimming regions, so that the brightness of the light emitted by the backlight source is consistent after the light penetrates through the light control structure, and the problem of uneven display caused by uneven light emission of the backlight source is avoided.

In one embodiment, as shown in FIG. 10, the step S1 may specifically include steps S11-S12.

Step S11: luminance data of light emitted by a backlight is acquired.

In one embodiment, the luminance data of the light emitted from the backlight source can be obtained by a luminance collecting device (e.g., a luminance sensor).

In a specific example, the luminance data may be luminance values of light emitted directly by the backlight, i.e., light emitted by the backlight is measured directly above the backlight to obtain luminance values thereof. More specifically, the luminance value of light emitted on the backlight is collected by a camera.

In another specific example, the luminance data may also be a luminance value of light emitted by the backlight source after passing through the photocontrol structure, in this case, the luminance value acquired by the luminance acquisition device is a luminance value of light emitted by the backlight source after passing through the photocontrol structure, the light incident surface of the photocontrol structure is close to the light emergent surface of the backlight source, the light emergent surface of the photocontrol structure is far away from the light emergent surface of the backlight source, light emitted by the light emergent surface of the backlight source reaches the light incident surface of the photocontrol structure first, and is emitted from the light emergent surface of the photocontrol structure after passing through the photocontrol structure, so as to acquire light emitted by the light emergent surface of the photocon. And then, brightness compensation is carried out according to the brightness value, so that the brightness of the light emitted from the light control structure is kept consistent, and the display unevenness caused by the nonuniformity of the light control structure is avoided.

Step S12: compensation data is determined from the luminance data.

In an embodiment, specifically, a preset brightness value of the brightness uniformity is preset, the collected brightness value is compared with the preset brightness value to obtain a difference value between the collected brightness value and the preset brightness value, and the difference value is used as compensation data, so that the compensation is performed according to the compensation data in the following process, and the problem of uneven display caused by uneven brightness of the backlight source is avoided. Of course, in other embodiments, the luminance data may be subjected to more complicated mathematical calculation to obtain the compensation data, such as dividing the luminance value by the preset luminance value to obtain the compensation data, or subtracting the luminance value from the preset luminance value and then multiplying by a coefficient to obtain the compensation data, which is merely illustrated in the present embodiment, but not limited thereto,

according to the control method of the digital backlight system, the brightness data of the backlight source is determined firstly, and then the compensation data is obtained according to the brightness data, so that the light control structure can be adjusted in different regions according to the compensation data, and local dimming is realized. Different backlight sources have different luminance data, and the compensation data is obtained according to the luminance data of the backlight sources, so that subsequent local dimming is more accurate, and the display uniformity is improved.

In an embodiment, when the light control structure is a single-color liquid crystal panel, the step of acquiring the luminance data of the light emitted by the backlight in step S11 may specifically include: the brightness data is obtained through the CCD camera, the acquisition precision of the CCD camera is high, and the control method is simple.

The liquid crystal display device sequentially comprises a backlight source, a monochromatic liquid crystal panel and a color liquid crystal panel from bottom to top, the monochromatic liquid crystal panel comprises a first liquid crystal layer and a first TFT layer used for controlling liquid crystal molecules in the first liquid crystal layer to rotate, and the color liquid crystal panel comprises a second liquid crystal layer and a second TFT layer used for controlling liquid crystal molecules in the second liquid crystal layer to rotate. The light emitted by the backlight source passes through the monochromatic liquid crystal panel and then passes through the color liquid crystal panel. The brightness value of light emitted by the color liquid crystal panel is collected through the camera, at the moment, the first TFT layer in the monochromatic liquid crystal panel controls liquid crystal molecules in the first liquid crystal layer to rotate to a completely transparent state, the second TFT layer in the color liquid crystal panel controls liquid crystal molecules in the second liquid crystal layer to rotate to the completely transparent state, and the completely transparent state is the state which allows light to penetrate to the maximum extent.

Since the camera is brightness data collected from the light exit surface side of the color liquid crystal panel, the brightness data includes the brightness value of each pixel on the color liquid crystal panel.

The monochrome liquid crystal panel comprises a plurality of pixels, each pixel can independently adjust light transmittance, and the light transmittance of the pixels is different by controlling the rotation angle of liquid crystal molecules in the pixels; the monochromatic liquid crystal panel is arranged between the color liquid crystal panel and the backlight source, so that the uniformity of display is improved, and normal color display is not influenced; and the manufacturing process of the monochromatic liquid crystal panel is similar to that of the color liquid crystal panel, the manufacturing process is mature, the reliability is high, the yield is high, and the production cost is reduced.

In an embodiment, as shown in fig. 11, the step of determining the compensation data according to the luminance data in step S12 may specifically include steps S121 to S122.

Step S121: a luminance map is generated from the luminance data.

In an embodiment, when the light control structure is a single-color liquid crystal panel, the step may specifically be to generate a map from the luminance data collected by the camera, where the map is a luminance map.

The map may be composed of the luminance value of each pixel on the single-color liquid crystal panel, or may be composed of the luminance value of each pixel on the color liquid crystal panel.

Under the condition that the map is formed by the brightness value of each pixel on the single-color liquid crystal panel, if the number of the pixels of the single-color liquid crystal panel is equal to that of the pixels of the color liquid crystal panel, namely the pixels of the single-color liquid crystal panel and the pixels of the color liquid crystal panel are in one-to-one correspondence, the brightness value of each pixel on the color liquid crystal panel acquired by the camera can directly obtain the map; if the number of pixels of the monochrome liquid crystal panel is smaller than the number of pixels of the color liquid crystal panel, that is, the pixels of the monochrome liquid crystal panel correspond to the pixels of the n color liquid crystal panels, the luminance value of each pixel on the monochrome liquid crystal panel needs to be obtained by processing the luminance value of each pixel on the color liquid crystal panel acquired by the camera, and the specific processing procedure may be to use an average value of the luminance values of the n color liquid crystal panels as the luminance value of the corresponding monochrome liquid crystal panel pixel, or to use a weighted value of the luminance values of the n color liquid crystal panels as the luminance value of the corresponding monochrome liquid crystal panel pixel.

In the case where the map is composed of the luminance value of each pixel on the color liquid crystal panel, the luminance value of each pixel on the color liquid crystal panel acquired by the camera is directly generated into the map. And corresponding conversion is carried out in the process of determining the compensation data of the monochromatic liquid crystal panel according to the map.

Step S122: and determining compensation data according to the brightness map, and sending the compensation data to the liquid crystal display device.

Specifically, a compensation value of each pixel on the monochrome liquid crystal panel is obtained according to the brightness value in the map, the compensation value is stored in a compensation look-up table (compensation LUT), and the compensation LUT is sent to the liquid crystal display device.

In a specific example, the compensation LUT can be stored in a memory, such as a Flash memory, SRAM, or the like.

If the map is composed of the luminance value of each pixel on the monochrome liquid crystal panel, the compensation value of each pixel on the monochrome liquid crystal panel can be directly obtained according to the map, and the compensation values are used as compensation data.

If the map is composed of the brightness value of each pixel on the color liquid crystal panel, when the number of the pixels of the single color liquid crystal panel is equal to the number of the pixels of the color liquid crystal panel, that is, the pixels of the color liquid crystal panel and the pixels of the single color liquid crystal panel are in one-to-one correspondence, the preset brightness value can be directly subtracted from the brightness value of each pixel in the map to obtain the compensation value of each pixel on the single color liquid crystal panel, and the compensation values form the compensation data. When the number of pixels of the single-color liquid crystal panel is less than that of the color liquid crystal panel, the brightness value of each pixel on the corresponding single-color liquid crystal panel can be obtained according to the brightness value of each pixel on the color liquid crystal panel, and then the compensation value of each pixel on the single-color liquid crystal panel can be obtained according to the brightness value of each pixel on the single-color liquid crystal panel; or obtaining the compensation value of each pixel on the color liquid crystal panel according to the brightness value of each pixel on the color liquid crystal panel, and then obtaining the compensation value of each pixel on the single-color liquid crystal panel according to the compensation value of each pixel on the color liquid crystal panel.

Specifically, the average value or weighted value of the luminance values of n color liquid crystal panel pixels is taken as the luminance value of the corresponding monochrome liquid crystal panel pixel, and then the preset luminance value is compared with the luminance value of the monochrome liquid crystal panel pixel to obtain a compensation value corresponding to the monochrome liquid crystal panel pixel, so as to obtain pixel compensation data of the monochrome liquid crystal panel; or comparing the brightness value of each pixel on the color liquid crystal panel with a preset brightness value to obtain a compensation value of each pixel on the color liquid crystal panel, and then taking the average value or the weighted value of the compensation values of n pixels on the color liquid crystal panel as the compensation value of the corresponding pixel on the monochrome liquid crystal panel to further obtain pixel compensation data of the monochrome liquid crystal panel; the present embodiment is only illustrative and not limited thereto.

Based on the above method, as shown in fig. 11, when the light control structure is a single color liquid crystal panel, step S2 may specifically include steps S21-S22.

Step S21: a compensation value for each pixel in the light control structure is determined based on the compensation data.

Specifically, the compensation data is a compensation value of each pixel in the monochrome liquid crystal panel, and the brightness of each pixel in the monochrome liquid crystal panel is adjusted according to the compensation value to improve the uniformity of display.

Step S22: the compensation value is compensated to each pixel in the light control structure.

In an embodiment, the compensation value corresponding to each pixel on the monochrome liquid crystal panel is applied to each frame of the display picture to output a picture with better uniformity, specifically, the picture gray scale is output to each pixel of the color liquid crystal panel, the compensation value is input to each pixel of the monochrome liquid crystal panel, and the brightness adjustment of the monochrome liquid crystal panel can reduce the influence caused by the non-uniformity of the backlight source and improve the uniformity of the display. The specific compensation process may be that the controller generates a corresponding PWM signal or DC signal (e.g. a voltage signal) according to the compensation value, inputs the PWM signal or DC signal into a TFT layer of the monochrome liquid crystal panel, and changes a rotation angle of liquid crystal molecules in the monochrome liquid crystal panel by changing a control voltage of the TFT, thereby adjusting a light transmittance degree of each pixel of the monochrome liquid crystal panel.

The control method of the digital backlight system improves the display uniformity by only adjusting the pixel luminous degree of the single-color liquid crystal panel without changing the gray scale control of the color liquid crystal panel, and is simple, convenient and easy to operate.

The embodiment of the present invention further provides a method for controlling a liquid crystal display device, which is applied to the liquid crystal display device in this embodiment, where the method for controlling a liquid crystal display device includes the method for controlling a digital backlight system in this embodiment, and further includes step S3.

Step S3: video input data is acquired.

In one embodiment, step S3 is before step S2, and as shown in fig. 12 in particular, step S3 is between steps S1 and S2, and the compensation data is obtained before the video input data is obtained. Of course, in other embodiments, the step S3 can be located before the step S1, that is, the video input data is obtained first and then the compensation data is obtained; it is also possible to obtain compensation data and video input data simultaneously; the method is reasonably set according to needs, the embodiment is only schematically described, and the specific process is not limited at all.

In one embodiment, the video input data may be gray scale data of a video frame, and the color liquid crystal panel is controlled to display the video frame according to the gray scale data.

In the present embodiment, the liquid crystal display device further includes a color liquid crystal panel, and the luminance data may be, in addition to the luminance values described in the above-mentioned control method of the digital backlight system, in a specific example, the luminance data is the luminance value of the light emitted by the backlight after passing through the light control structure and the color liquid crystal panel; in this case, the brightness value acquired by the brightness acquisition device is the brightness value of the light emitted by the backlight source after passing through the light control structure and the color liquid crystal panel. Specifically, when the light control structure is located between the backlight source and the color liquid crystal panel, light emitted from the backlight source reaches the color liquid crystal panel through the light control structure, then passes through the color liquid crystal panel, and acquires a brightness value of the light emitted from the color liquid crystal panel, and specifically, the brightness value can be acquired by performing brightness acquisition on the light exit surface side of the color liquid crystal panel. And then, brightness compensation is carried out according to the brightness value, so that the brightness of the light emitted from the color liquid crystal panel is kept consistent, uneven display caused by non-uniformity of the color liquid crystal panel is avoided, and the display effect is improved.

In other embodiments, when the color liquid crystal panel is located between the backlight source and the light control structure, light emitted from the backlight source passes through the color liquid crystal panel and then the light control structure, and at this time, the brightness value of the light emitted from the light control structure is collected by the brightness collection device; the position of the specific acquisition brightness value can be reasonably set according to actual needs. And then, brightness compensation is carried out according to the brightness value, so that the brightness of the light emitted by the backlight source after passing through the light control structure and the color liquid crystal panel is kept consistent, the display unevenness caused by the nonuniformity of the light control structure and the nonuniformity of the color liquid crystal panel is avoided, and the display effect is better.

On the basis of the above method, as shown in fig. 12, when the light control structure is a monochrome liquid crystal panel, the step S2 of adjusting the light control structure according to the compensation data specifically includes: the color liquid crystal panel is controlled according to the video input data, and the monochrome liquid crystal panel is controlled according to the video input data and the compensation data.

In one embodiment, the color liquid crystal panel is controlled according to video input data, and is used for realizing the picture display of the color liquid crystal panel; the monochrome liquid crystal panel is controlled according to the video input data and the compensation data, the video input data input into the monochrome liquid crystal panel can be used for realizing High Dynamic Range (HDR) image control or Color GAMUT (Color GAUT) control of a display picture, the compensation data input into the monochrome liquid crystal panel can be used for adjusting the uniformity of a backlight source, and the adjustment on the monochrome liquid crystal panel not only has the function of adjusting the uniformity of the backlight source, but also has the function of improving the picture display quality.

On the basis of the above method, as shown in fig. 13, before the step of acquiring the compensation data of the light emitted by the backlight at step S1, the method further includes step S4.

Step S4: and acquiring a compensation starting signal for starting the backlight brightness compensation.

In an embodiment, the compensation start signal may be an electrical signal generated when the lcd device is started, and if the lcd device is a TV, the compensation start signal may be a power-on signal of the TV, that is, the controller may obtain the compensation start signal each time the TV is powered on, and then read the compensation data from the memory for adjusting the uniformity of the backlight source. Of course, in other embodiments, the compensation start signal may also be obtained through a compensation touch key on the liquid crystal display device, that is, an electrical signal generated after the compensation touch key is pressed; any changes or modifications made by those skilled in the art without inventive efforts based on the description of the present embodiments fall within the inventive concept.

In the following, a specific example is described in detail, the liquid crystal display device is a liquid crystal Television (TV), which includes a color liquid crystal panel, a monochrome liquid crystal panel and a backlight source, and the control process is specifically shown in fig. 14. The first processor is used for controlling the Color liquid crystal panel to display image frames, and is marked as Tcon (timing Controller for Color cell); the second processor is used for controlling the monochromatic liquid crystal panel, and is recorded as LiteCon or Lcon, specifically, controlling the Light On/OffController of the monochromatic liquid crystal panel, receives the video input signal and the brightness compensation signal of the backlight source, generates a control signal of the monochromatic liquid crystal panel after processing the video input signal and the brightness compensation signal, and controls the monochromatic liquid crystal panel to realize brightness adjustment. First, compensation Data (referred to as LiteCon Data in this specific example) for compensating for backlight non-uniformity is stored in Flash, and when the Power-on of the TV is turned on (Power-on), that is, when the TV is turned on, the LiteCon Data is downloaded and read from Flash by the second processor LiteCon, and is stored in the DDR memory. Secondly, the second processor LiteCon reads LiteCon Data from the DDR memory and performs Data processing on the LiteCon Data, and then the second processor LiteCon also performs Data processing on input Video input Data, inputs the Data processed by the LiteCon Data and the Data processed by the Video input Data to the monochrome liquid crystal panel, and is used for backlight source non-uniformity compensation, color gamut adjustment and HDR realization; the first controller Tcon receives input Video input Data Video Data, processes the Video input Data Video Data to generate control Data of the color liquid crystal panel, and the control Data is used for controlling the color liquid crystal panel; it should be noted that the control of the monochrome liquid crystal panel and the color liquid crystal panel needs to meet specific timing requirements, so the clock signals of the first processor and the second processor are reasonably set according to actual needs. Finally, when the power of the TV is turned off, the second processor controls Flash to save the LiteCon Data so that the LiteCon Data can be effectively read when the TV is turned on next time. It should be noted that in this embodiment, two processors are used to control the monochrome liquid crystal panel and the color liquid crystal panel, respectively, in other embodiments, one processor may also be used to control the monochrome liquid crystal panel and the color liquid crystal panel, that is, the first processor and the second processor are the same processor. In addition, the technical scheme in the embodiment adopts a Flash memory and a DDR memory; flash is used for ensuring that data can still be stored after power failure, and the reliability of data storage is improved; the DDR memory is an external memory of the LiteCon, does not occupy the internal memory of the LiteCon, and reduces the size and cost of the LiteCon; of course, in other embodiments, the LiteCon Data may also be directly stored in a memory inside the LiteCon, such as an SRAM inside the LiteCon; or firstly storing the LiteCon Data into Flash, and then reading the LiteCon Data in the Flash into a memory (such as SRAM) inside the LiteCon; the specific storage manner of the data can be reasonably set according to needs, and this embodiment is only schematically described, and is not limited thereto.

For convenience of understanding the inventive concept of the present technical solution, the following detailed description is made with another specific example. Fig. 15 is a schematic diagram of a liquid crystal display device in an embodiment of the present invention, and as shown in fig. 15, the liquid crystal display device includes an LED backlight 151, a light control structure 2 (the light control structure is a monochrome liquid crystal panel), a color liquid crystal panel 3, and a driving structure 4 for driving the monochrome liquid crystal panel, where the driving structure 4 includes a Flash memory41 for compensating data storage and a driving chip 42. As shown in fig. 16, firstly, acquiring brightness data of the monochrome liquid crystal panel from above the monochrome liquid crystal panel by using a camera; then, calculating the collected brightness data to obtain calculated compensation data, and writing the compensation data into a storage medium (such as Flash memory); then, the compensation data is used to drive the pixels of the monochrome liquid crystal panel, specifically, the compensation data stored in the medium is read by the driving structure (such as a driving chip), and the compensation data is added to the original display data of the monochrome liquid crystal panel to drive the monochrome liquid crystal panel, so that the optimal brightness uniformity is ensured, and the brightness uniformity is greatly improved. Fig. 17 is luminance data of each pixel on the obtained monochrome liquid crystal panel; FIG. 18 is compensation data obtained after a compensation operation; fig. 19 shows the luminance of the compensated lcd panel. The method adopts the brightness of each pixel of the single-color liquid crystal panel to compensate the backlight source, ensures the brightness uniformity of large-area backlight, and ensures the uniformity of the whole display.

It should be noted that, when there is a black area on the screen displayed by the color liquid crystal panel, the corresponding area on the monochrome liquid crystal panel is also displayed as black, so as to reduce the light reaching the color liquid crystal panel as much as possible.

In this embodiment, a control device of a digital backlight system is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and the description of the device that has been already made is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Accordingly, referring to fig. 20, an embodiment of the present invention further provides a control device of a digital backlight system, including: a first obtaining module 121 and a first processing module 122.

A first obtaining module 121, configured to obtain compensation data of light emitted by the backlight source, where the compensation data is used to represent brightness nonuniformity of the light emitted by the backlight source; the details are described with reference to step S1.

The first processing module 122 is configured to adjust the light control structure according to the compensation data, so that the brightness of light emitted by the backlight source after passing through the light control structure is uniform; the details are described with reference to step S2.

In one embodiment, the first obtaining module includes: a first acquiring unit configured to acquire luminance data of light emitted from the backlight, the details of which are described with reference to step S11; a first processing unit for determining compensation data based on the luminance data, the details of which are described with reference to step S12.

In one embodiment, the first processing unit comprises: a first processing subunit, configured to generate a luminance map according to the luminance data, details of which are described with reference to step S121; and a second processing subunit, configured to determine compensation data according to the luminance map, and send the compensation data to the liquid crystal display device, the details of which are described with reference to step S122.

In one embodiment, the luminance data is a luminance value directly emitted by the backlight source; or the brightness data is the brightness value of the light emitted by the backlight after passing through the light control structure.

In one embodiment, when the light control structure is a monochrome liquid crystal panel, the first processing module includes: a second processing unit, configured to determine a compensation value for each pixel in the light control structure according to the compensation data, the details of which are described with reference to step S21; a third processing unit for compensating the compensation value to each pixel in the light control structure, the details of which are described with reference to step S22.

Further functional descriptions of the modules are the same as those of the method embodiments, and are not repeated herein.

In this embodiment, a control device of a liquid crystal display device is further provided, and the device is used to implement the above embodiments and preferred embodiments, which have already been described and are not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Accordingly, referring to fig. 21, an embodiment of the present invention further provides a control device for a liquid crystal display device, including the control device for the digital backlight system in the embodiment of the present invention, further including: a second obtaining module 123, configured to obtain the video input data, details of which are described with reference to step S3.

In one embodiment, when the light control structure is a monochrome liquid crystal panel, the first processing module includes: and the fourth processing unit is used for controlling the color liquid crystal panel according to the video input data and controlling the single-color liquid crystal panel according to the video input data and the compensation data.

In one embodiment, the luminance data is a luminance value of light emitted from the backlight source after passing through the light control structure and a luminance value of the color liquid crystal panel.

In one embodiment, the control device of the liquid crystal display device further includes: a third obtaining module, configured to obtain a compensation start signal for starting the brightness compensation, which is described in detail with reference to step S4.

An embodiment of the present invention further provides an electronic device, as shown in fig. 22, including: a processor 101 and a memory 102; the processor 101 and the memory 102 may be connected by a bus or other means, and fig. 22 illustrates the connection by the bus as an example.

The processor 101 may be a Central Processing Unit (CPU). The Processor 101 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.

The memory 102, as a non-transitory computer readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the control method of the digital backlight system in the embodiment of the present invention (for example, the first acquiring module 121 and the first processing module 122 shown in fig. 20), or program instructions/modules corresponding to the control method of the liquid crystal display device in the embodiment of the present invention (for example, the first acquiring module 121, the first processing module 122, and the second acquiring module 123 shown in fig. 21). The processor 101 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory 102, that is, implements the control method of the digital backlight system in the above method embodiment, or implements the control method of the liquid crystal display device in the above method embodiment.

The memory 102 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 101, and the like. Further, the memory 102 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 102 may optionally include memory located remotely from processor 101, which may be connected to processor 101 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The one or more modules are stored in the memory 102, and when executed by the processor 101, perform a control method of the digital backlight system in the embodiment shown in fig. 9 to 11, or perform a control method of the liquid crystal display device in the embodiment shown in fig. 12 to 16.

The specific details of the server may be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 9 to fig. 16, and are not described herein again.

The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer instruction, where the computer instruction is used to enable the computer to execute any one of the above control methods for the digital backlight system or any one of the above control methods for the liquid crystal display device. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a flash Memory (FlashMemory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A digital backlight system, comprising:

a backlight source including a light emitting surface;

the light control structure is arranged on one side of the light emitting surface of the backlight source, comprises a plurality of different dimming areas and is used for adjusting the light emitted by the backlight source so as to enable the light emitted by the backlight source to penetrate through the light with uniform brightness after the light control structure.

2. The digital backlight system of claim 1, wherein the backlight comprises only light emitting source devices and no optical films;

preferably, the light control structure is a monochrome liquid crystal panel;

preferably, the size of the monochromatic liquid crystal panel is not smaller than the size of the backlight source.

3. A liquid crystal display device comprising the digital backlight system according to any one of claims 1 to 2, the liquid crystal display device further comprising:

the color liquid crystal panel is arranged on one side of the light emitting surface of the backlight source;

preferably, if the light control structure is a monochrome liquid crystal panel, the monochrome liquid crystal panel is located between the color liquid crystal panel and the backlight source;

preferably, the size of the monochrome liquid crystal panel is the same as that of the color liquid crystal panel, and the number of pixels of the monochrome liquid crystal panel is not greater than that of the color liquid crystal panel;

preferably, the light control structure is a transparent structure, and the transparent structure is located between the color liquid crystal panel and the backlight source;

and/or the presence of a gas in the gas,

the transparent structure is positioned on one side of the color liquid crystal panel, which is far away from the backlight source.

4. A method for controlling a digital backlight system, applied to the digital backlight system as claimed in any one of claims 1 to 2, comprising:

acquiring compensation data of light emitted by a backlight source, wherein the compensation data is used for representing brightness nonuniformity of the light emitted by the backlight source;

and adjusting the light control structure according to the compensation data so that the brightness of the light emitted by the backlight source after penetrating through the light control structure is uniform.

5. The method of claim 4, wherein the step of obtaining the compensation data of the light emitted from the backlight comprises:

acquiring brightness data of light emitted by a backlight source;

determining the compensation data according to the brightness data;

preferably, the step of determining the compensation data according to the brightness data includes:

generating a brightness map according to the brightness data;

determining compensation data according to the brightness graph, and sending the compensation data to the liquid crystal display device;

preferably, the brightness data is a brightness value directly emitted by the backlight source; or the brightness data is the brightness value of the light emitted by the backlight source after the light penetrates through the light control structure;

preferably, when the light control structure is a monochrome liquid crystal panel, the step of adjusting the light control structure according to the compensation data includes:

determining a compensation value of each pixel in the light control structure according to the compensation data;

the compensation value is compensated to each pixel in the light control structure.

6. A method for controlling a liquid crystal display device, which is applied to the liquid crystal display device according to any one of claims 3, comprising the method for controlling the digital backlight system according to any one of claims 4 to 5; the control method of the liquid crystal display device further includes:

acquiring video input data;

controlling the color liquid crystal panel according to the video input data, and controlling the monochrome liquid crystal panel according to the video input data and the compensation data;

preferably, the luminance data is a luminance value of light emitted by the backlight source after the light passes through the light control structure and a luminance value of the color liquid crystal panel;

preferably, before the step of acquiring the compensation data of the light emitted by the backlight, the method further includes:

a compensation start signal for starting luminance compensation is acquired.

7. A control device for a digital backlight system, comprising:

the first acquisition module is used for acquiring compensation data of light emitted by the backlight source, and the compensation data is used for representing brightness nonuniformity of the light emitted by the backlight source;

and the first processing module is used for adjusting the light control structure according to the compensation data so as to enable the brightness of the light emitted by the backlight source after penetrating through the light control structure to be uniform.

8. A control device for a liquid crystal display device, comprising: the control device of the digital backlight system as claimed in claim 7, the control device of the liquid crystal display device further comprising:

and the second acquisition module is used for acquiring the video input data.

9. An electronic device, comprising:

a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, and the processor executing the computer instructions to perform the method for controlling the digital backlight system according to any one of claims 4 to 5 or to perform the method for controlling the liquid crystal display device according to claim 6.

10. A computer-readable storage medium characterized in that it stores computer instructions for causing a computer to execute the method of controlling a digital backlight system according to any one of claims 4 to 5 or the method of controlling a liquid crystal display device according to claim 6.