CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a national stage application of PCT Patent Application No. PCT/CN2020/098025, filed on Jun. 24, 2020, which claims priority to Chinese Patent Application No. 201910719839.3, filed on Aug. 6, 2019, the content of all of which is incorporated herein by reference.

FIELD OF THE APPLICATION

The present disclosure relates to the technical field of MINI LED television light control, and in particular, to a method and a device for adjusting a MINI LED backlight television picture, a smart television and a storage medium.

BACKGROUND

MINI LED backlight is actually an upgrade of LED backlight. Originally, there was only one LED light bar and brightness is spread by a light guide plate. However, the MINI LED backlight achieves backlight effect by a large number of ultra-small LED lamp groups. In this way, the MINI LED backlight not only can make the local dimming zones more exquisite to achieve the effect that a high dynamic range (HDR) presents a high contrast ratio, but also can shorten an optical distance (OD) to reduce the thickness of the whole machine and meet the requirement of thinning.

Multi-area dynamic dimming is one of the ways to improve the picture quality of TV set. The ordinary LED backlight multi-analysis dimming is adopted at present. With the progress of the display technology and the production process, the MINI LED with higher precision is also applied to television backlight. The appearance of MINI LED backlight obviously improves the overall effect of the television picture. However, due to the fine process, the lens (optical lens) used in the traditional LED backlight module has not kept pace with the miniaturization of the MINI LED. In addition, due to the fine light control of the MINI LED, the lens is not required theoretically. However, since there is no lens, the MINI LED light path is affected by the light path of the lamp, as shown inFIG. 1, when the displayed image is similar to that the phenomenon of black shadows on the moving edge will appear when one shown bright target moves to the surrounding black area, so that the quality of the television picture is affected.

As shown inFIG. 2, it is a schematic diagram of an ordinary LED module dynamic dimming structure. The module structure, over which a glass diaphragm is, comprises a diaphragm assembly5, a diffusion plate4, a supporting column3, an optical lens2and a lamp panel1sequentially from top to bottom, wherein the number and spacing of lamp beads on the lamp panel are determined according to the requirements of picture quality and brightness. After the lamps on the lamp panel are turned on, light is projected to the diffusion plate through the lens, so that the LED light can be uniformly diffused and the light to the diffusion plate form light energy distribution with uniform brightness and darkness. When there is an area with obvious brightness change, the improvement requirement is met by the existing algorithm.

As shown inFIG. 3, it is a schematic diagram of a MINI LED module dynamic dimming structure. Similarly, the module structure, over which a glass diaphragm is, comprises a diaphragm assembly4, a diffusion plate3, a supporting column2and a lamp panel1sequentially from top to bottom, wherein the number and spacing of lamp beads on the lamp panel are determined according to the requirements of picture quality and brightness. Under the condition of high fineness of the MINI LED and a large number of the lamps, the optical lens cannot be designed on the lamp beads of the MINI LED. After the lamps on the lamp panel are turned on, light is projected to the diffusion plate, so that each LED lamp is relative uniform. However, at the junction of the lamps, since there is no change on the light path caused by transparency, non-uniform brightness and darkness distribution will appears in the area where the brightness of the adjacent frames changes obviously, and the same light to the diffusion plate forms uniform brightness and darkness. Although the use of the MINI LED technology improves brightness and contrast ratio, some specific picture quality is affected negatively.

Therefore, the prior art still needs to be improved and developed.

BRIEF SUMMARY OF THE DISCLOSURE

A main objective of the present disclosure provides a method for adjusting a MINI LED backlight television picture, a smart television and a storage medium, thus solving the problem in the prior art that the MINI LED backlight module television generates shadows caused by the image of the motion picture.

To achieve the above objective, the present disclosure provides a MINI LED backlight television adjusting method. The method for adjusting a MINI LED backlight television picture comprises the following steps:

receiving audio and video input, acquiring brightness information and color information of each pixel area of each frame of image through image analysis, and providing reference data for image display optimization;

according to a relationship between frames of the image, optimizing image display effect transition of previous frame and next frame, adjusting a refresh rate of backlight control to a preset multiple of image display and pre-lightening the next frame of image at the same time; and

outputting a bright and dark motion picture with uniform human-eye-perceived motion transition, and displaying a final picture on a display screen according to a driving screen image display signal.

Optionally, in the method for adjusting a MINI LED backlight television picture, the acquiring brightness information and color information of each pixel area of each frame of image through image analysis, and providing reference data for image display optimization comprises:

acquiring brightness information of a first frame of image and brightness information of a second frame of image, the first frame of image being adjacent to the second frame of image;

comparing brightness values of pixel areas of the first frame of image and the second frame of image; and

recording a corresponding area and calculating a gray value when a difference value of the two brightness values is greater than a first threshold value.

Optionally, the method for adjusting a MINI LED backlight television picture further comprises: when a difference value of the two brightness values is not greater than a first threshold value, directly judging whether the current frame is the last frame of image; and

if yes, ending, and if not, acquiring brightness information of the next frame of image and comparing brightness values of pixel areas of the adjacent two frames of images.

Optionally, in the method for adjusting a MINI LED backlight television picture, after the recording a corresponding area and calculating a gray value when a difference value of the two brightness values is greater than a first threshold value, the method further comprises:

judging whether the current frame is the last frame of image; and if yes, ending, and if not, acquiring brightness information of the next frame of image and comparing brightness values of pixel areas of the adjacent two frames of images.

Optionally, in the method for adjusting a MINI LED backlight television picture, the adjusting the refresh rate of backlight control to the preset multiple of image display and pre-lightening the next frame of image at the same time comprises:

in a motion picture, when two frames of images show a scene with an obvious brightness change, detecting an appearance position of the image; and

according to the appearance position of the image and a degree of the brightness changes of both images, adjusting the refresh rate of backlight control to a preset multiple of image display under the condition that the image display refresh rate is unchanged, and pre-lightening the next frame of image at the same time.

Optionally, in the method for adjusting a MINI LED backlight television picture, the pre-lightening the next frame of image comprises:

acquiring a brightness and a chromaticity of a first frame of image, controlling backlight and display according to the brightness and chromaticity of the first frame of image, and reading a record chart;

judging whether the next frame of image has a change that is greater than a second threshold value, if not, controlling backlight image display according to a brightness of a pixel area of an actual frame; and

if yes, reading a corresponding area and calculating a gray value, controlling a refresh rate of backlight control to be increased by a preset multiple to pre-lighten an area which is switched to bright when being dark and has a change greater than a third threshold value, and controlling image display according to a normal grayscale of the next frame of image.

Optionally, in the method for adjusting a MINI LED backlight television picture, after the controlling image display according to the normal grayscale of the next frame of image, the method further comprises:

judging whether the current frame is the last frame of image, if yes, ending, and if not, continuously judging whether the next frame of image has a change that is greater than a second threshold value.

Optionally, in the method for adjusting a MINI LED backlight television picture, before the outputting a bright and dark motion picture with uniform human-eye-perceived motion transition, the method further comprises:

performing black shielding on the picture by a current adjacent pixel bright field.

Optionally, in the method for adjusting a MINI LED backlight television picture, the performing black shielding on the picture by the current adjacent pixel bright field comprises:

acquiring a brightness and a chromaticity of a first frame of image, controlling backlight and display according to the brightness and chromaticity of the first frame of image, and reading a record chart;

judging whether the next frame of image has a change that is greater than a second threshold value, if not, controlling backlight image display according to a brightness of a pixel area of an actual frame; and

if yes, reading a corresponding area and calculating a gray value, turning off backlight for a change area of the next frame of image adjacent to the current frame of image, and controlling image display according to a normal grayscale of the next frame of image.

Optionally, in the method for adjusting a MINI LED backlight television picture, after the controlling image display according to the normal grayscale of the next frame of image, the method further comprises:

judging whether the current frame is the last frame of image, if yes, ending, and if not, continuously judging whether the next frame of image has a change that is greater than a second threshold value.

Optionally, in the method for adjusting a MINI LED backlight television picture, the preset multiple is greater than 2.

In addition, to achieve the above objective, the present disclosure further provides a MINI LED backlight television adjusting device. The device for adjusting a MINI LED backlight television picture comprises:

a power supply system, an audio and video signal input port, an image core analysis module, a memory, an SPI communication interface, an image display processing module, a backlight control unit circuit, a MINI LED driving circuit and a display screen, wherein

the display screen comprises a MINI LED lamp module and a T-CON board (Timing Controller board);

the audio and video signal input port is configured to provide an audio and video input interface;

the image core analysis module is configured to analyze an image and acquire information of each frame of image;

the image display processing module is configured to improve the image and transmit the image to the T-CON board;

the backlight control unit circuit is configured to receive a brightness information gray value of each pixel area through the SPI communication interface; and

the display screen is configured to display the adjusted final picture.

Optionally, in the device for adjusting a MINI LED backlight television picture, the audio and video signal input port provides the audio and video input interface of a system, and the image core analysis module analyzes the image, acquires brightness information and color information of each pixel area of each frame of image to provide reference data for backlight and image display optimization, optimizes image display effect transition of previous frame and next frame by an algorithm according to a relationship between the frame and transmitting data (a brightness information gray value of each pixel area) to the backlight control unit circuit according to an algorithm and through the SPI communication interface when controlling the backlight; and when the image display is optimized and improved, the brightness and the chromaticity are transmitted to the image display processing module, the image display processing module transmits the improved image to the T-CON board, and a signal picture displayed by a driving screen image is displayed on the display screen.

In addition, to achieve the above objective, the present disclosure further provides a smart television. The smart television comprises: a memory, a processor and an MINI LED backlight television picture adjusting program which is stored in the memory and may operate on the processor, wherein the MINI LED backlight television picture adjusting program, when being executed by the processor, enables the processor to implement steps of the above method for adjusting a MINI LED backlight television picture.

In addition, to achieve the above objective, the present disclosure further provides a storage medium, wherein the storage medium stores a MINI LED backlight television picture adjusting program, and the MINI LED backlight television picture adjusting program, when being executed by the processor, enables the processor to implement steps of the above method for adjusting a MINI LED backlight television picture.

According to the present disclosure, audio and video input is received, brightness information and color information of each pixel area of each frame of image are acquired through image analysis, and reference data for image display optimization is provided; according to a relationship between frames of the image, image display effect transition of previous frame and next frame is optimized, a refresh rate of backlight control is adjusted to a preset multiple of image display and the next frame of image is pre-lightened at the same time; and a bright and dark motion picture with uniform human-eye-perceived motion transition is output, and the final picture is displayed on the display screen according to a driving screen image display signal, so that the picture display effect is improved.

