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Backlight brightness compensation method and display device

A technology of backlight brightness and compensation method, which is applied to static indicators, cathode ray tube indicators, instruments, etc., and can solve problems such as image distortion, low brightness of backlight, and grayscale merging

Active Publication Date: 2015-12-23
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When most of the display image presents a lower gray scale and a few local pixels present a higher gray scale, the brightness of the backlight source is low, and the display panel still adopts the above compensation method, which will result in the required display grayscale of some pixels of the display panel. The gray scale exceeds the maximum gray scale that it can display, and at this time, the pixels of the display device are uniformly displayed as the maximum gray scale, resulting in the phenomenon of gray scale merging
Specifically: For example, when the number of gray scales that can be displayed by the display device is 256, some pixels that need to display gray scales greater than 255 after compensation may appear, and the pixels of this part will be uniformly displayed as 255, which leads to image distortion. Clipping in Grayscale Merging

Method used

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  • Backlight brightness compensation method and display device
  • Backlight brightness compensation method and display device

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Experimental program
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Effect test

Embodiment 1

[0078] Such as figure 1 As shown, the backlight brightness compensation method of this embodiment includes:

[0079] Receive and determine the original gray scale of each pixel according to the input image; specifically, confirm the original gray scale of the R\G\B three sub-pixels in each pixel and the corresponding pixel brightness according to the input image;

[0080] The backlight brightness is determined according to the input image; this embodiment is used in an OD backlight (global dimming backlight) display device. The display device contains a pixel matrix. The original gray levels of different pixels correspond to different ideal pixel brightness, while the OD backlight only It can provide uniform brightness, so a backlight brightness needs to be determined; the backlight source outputs light according to the backlight brightness;

[0081] According to the compensation factor f com Perform linear compensation on the original gray scale to obtain the compensated gray scale...

Embodiment 2

[0118] Such as Figure 3-Figure 4 As shown, the display device of this embodiment includes a backlight source and a display panel 2 located on the light emitting side of the backlight source and including a pixel matrix, and further includes:

[0119] The video conversion unit 6 is used to receive the input image and determine the original gray scale of the pixel; receive the input image and convert it into the pixel brightness corresponding to each pixel in the pixel matrix and the original gray scale displayed; the video conversion unit 6 may be a video conversion circuit Or an integrated video converter;

[0120] The backlight brightness determining unit 4 is used to determine the brightness of the backlight according to the input image; in the specific determination process, the brightness of the backlight is controlled by adjusting the backlight brightness control value; the specific physical structure of the backlight brightness determining unit may be specific logic Circuit...

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Abstract

The invention discloses a backlight brightness compensation method and a display device and aims to solve such problems that image distortion is serious and display effect is poor in the prior art. The backlight brightness compensation method includes: receiving, and determining original gray scales of pixels according to an input image; determining backlight brightness according to the input image; linearly compensating the original gray scales according to a compensation factor fcom so as to obtain compensated gray scale of each pixel; judging whether the compensated gray scale of each pixel is larger than the maximum gray scale of the display device or not; if not, determining that the display gray scale of the pixel is the compensated gray scale; if yes, judging whether pixel brightness corresponding to the original gray scale of the pixel is smaller than the backlight brightness or not; if smaller, determining that the display gray scale of the pixel is the compensated gray scale; if not smaller, determining that the display gray scale of the pixel is the gray scale obtained by linearly compensating the original gray scale according to the compensation factor fcom. The backlight brightness compensation method and the display device have the advantages that image displaying effect is good, resolution is high, the structure is simple and production cost is low.

Description

Technical field [0001] The invention relates to the field of display, in particular to a backlight brightness compensation method and a display device. Background technique [0002] A display device such as a liquid crystal display usually includes a display panel and a backlight source that provides light to the display panel. In order to cooperate with the display panel to display images of different brightness and color, the backlight source is divided into a global dimming backlight source and a partition dimming backlight source. If the backlight source is a global dimming backlight, it can only show two states of full brightness and full darkness. When the part of the displayed image is in a lower gray scale, the backlight source still shows a full brightness state, resulting in the display panel showing a lower display Light leakage occurs locally in the gray scale, which increases the gray scale of the displayed image, thereby reducing the contrast of the displayed image...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G5/10
CPCG09G3/3406
Inventor 刘丽丽刘卫东葛中峰
Owner HISENSE VISUAL TECH CO LTD
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