阅读说明：本技术 一种补偿显示屏mura缺陷的方法及装置 (A kind of method and device compensating display screen mura defect ) 是由 黄剑辉 于 2019-07-29 设计创作，主要内容包括：本发明公开了一种补偿显示屏mura缺陷的方法,包括：图像采集：拍摄显示屏显示纯黑画面的图像,并转化成数字图像；相对亮度化处理：增强采集图像的对比度,突显图像的mura缺陷；图像滤波：通过滤波处理采集图像提取mura的特征图像,得到mura缺陷区域图；亮度偏置补偿：对mura的特征图像进行取样,得到亮度偏置补偿图；反馈校准：根据亮度偏置补偿图读取亮度偏置补偿值,根据所述亮度偏置补偿值控制驱动降低相应mura区域的LED亮度。采用该技术方案提升了产品的显示效果。(The invention discloses a kind of methods for compensating display screen mura defect, comprising: Image Acquisition: shooting display screen shows the image of black picture, and is converted to digital picture；Relative luminanceization processing: the contrast of enhancing acquisition image highlights the mura defect of image；Image filtering: by the characteristic image of filtering processing acquisition image zooming-out mura, mura defect area figure is obtained；Brightness bias compensation: being sampled the characteristic image of mura, obtains brightness bias compensation figure；Feedback calibration: reading brightness bias compensation value according to brightness bias compensation figure, and controlling driving according to the brightness bias compensation value reduces the LED luminance in the corresponding region mura.The display effect of product is improved using the technical solution.)

1. a kind of method for compensating display screen mura defect characterized by comprising

Image Acquisition: shooting display screen shows the image of black picture, and is converted to digital picture；

Relative luminanceization processing: the contrast of enhancing acquisition image highlights the mura defect of image；

Image filtering: by the characteristic image of filtering processing acquisition image zooming-out mura, mura defect area figure is obtained；

Brightness bias compensation: being sampled the characteristic image of mura, obtains brightness bias compensation figure；

Feedback calibration: brightness bias compensation value is read according to brightness bias compensation figure, is controlled according to the brightness bias compensation value Driving reduces the LED luminance in the corresponding region mura.

2. a kind of method for compensating display screen mura defect as described in claim 1, which is characterized in that described image filtering is adopted With median filtering, bilateral filtering or gaussian filtering.

3. a kind of method for compensating display screen mura defect as claimed in claim 2, which is characterized in that using at gaussian filtering Reason shows that details is blurred so that acquiring image, uniform background image is obtained, by the background image and relative luminance Treated, and acquisition image subtraction obtains mura defect area figure.

4. a kind of method for compensating display screen mura defect as claimed in claim 3, which is characterized in that the display screen uses Direct-type backlight.

5. a kind of method for compensating display screen mura defect as claimed in claim 4, which is characterized in that the brightness biasing is mended It repays and is sampled including the characteristic image to mura, sampling interval is consistent with the brightness control area interval of direct-type backlight, with On the basis of product design brightness and given threshold.

6. a kind of device for compensating display screen mura defect, which is characterized in that including sequentially connected image acquisition units, relatively Brightness processing unit, image filtering unit, brightness bias compensation unit and feedback calibration unit, wherein

Described image acquisition unit is used to shoot display screen and shows the image of black picture, and is converted to digital picture；

The relative luminance processing unit is used to enhance the contrast of acquisition image, highlights the mura defect of image；

Described image filter unit is used to obtain mura defect area by the characteristic image of filtering processing acquisition image zooming-out mura Domain figure；

The brightness bias compensation unit obtains brightness bias compensation figure for being sampled to the characteristic image of mura；

The feedback calibration unit is used to read brightness bias compensation value according to brightness bias compensation figure, is biased according to the brightness Offset control driving reduces the LED luminance in the corresponding region mura.

7. a kind of device for compensating display screen mura defect as claimed in claim 6, which is characterized in that described image filtering is single Member uses median filtering, bilateral filtering or gaussian filtering.

8. a kind of device for compensating display screen mura defect as claimed in claim 7, which is characterized in that the display screen uses Direct-type backlight.

Technical field

The present invention relates to field of display technology, in particular to a kind of method and device for compensating display screen mura defect.

Background technique

In display panel production process, since processing procedure controls difference, one kind is had when showing certain pictures and is called The defect of mura (meaning that display is uneven), since mura is a kind of defects of display panel, traditional LCM (liquid crystal display die set) Structure limitation cannot be optimized for part mura, and the display panel for needing mura effect good could output display mass effect Good product, for display module manufacturer, the high request of raw material will cause design cost rising.

The brightness of mura defect area is brighter compared with display homogeneous area, but since the backlight design mainstream of current LCM is side Enter formula design, as shown in Figure 1,1 backlight iron frame, 2LED soft arranging wire, 3LED, 4 diffusion sheets, 5 light guide plates, i.e. light source are sent out from one end Out, form uniform light-emitting surface by membrane materials such as light guide plate and diffusion sheets, backlight can only integrally adjusting brightness, be unable to specific aim Ground carries out brightness adjustment to the mura of certain display areas, reduces the brightness of mura defect area.

Direct-type backlight uses the LED of array arrangement, as shown in Fig. 2, 1 backlight iron frame, 2LED, 3PCB substrate, 4 diffusions Piece, 5 light guide plates, light source is directly facing display area, if driving method support can be with the brightness of localized region backlight, i.e., Local Dimming (local dimming) technology, the brightness of mura defect area is brighter, using the display of the scheme of direct-type backlight The adjustable local backlight brightness of mould group, reduces the subjective perception of mura.

Summary of the invention

The embodiment of the present invention is designed to provide a kind of method for compensating display screen mura defect, improves the aobvious of product Show effect.

A kind of method compensating display screen mura defect provided in an embodiment of the present invention, comprising:

Image Acquisition: shooting display screen shows the image of black picture, and is converted to digital picture；

Relative luminanceization processing: the contrast of enhancing acquisition image highlights the mura defect of image；

Image filtering: by the characteristic image of filtering processing acquisition image zooming-out mura, mura defect area figure is obtained；

Brightness bias compensation: being sampled the characteristic image of mura, obtains brightness bias compensation figure；

Feedback calibration: brightness bias compensation value is read according to brightness bias compensation figure, according to the brightness bias compensation value Control driving reduces the LED luminance in the corresponding region mura.

Optionally, described image filtering uses median filtering, bilateral filtering or gaussian filtering.

Optionally, make acquisition image show that details is blurred using gaussian filtering process, obtain uniform Background Picture, by the background image and relative luminanceization, treated that acquisition image subtraction obtains mura defect area figure.

Optionally, the display screen uses direct-type backlight.

Optionally, the brightness bias compensation includes being sampled to the characteristic image of mura, sampling interval and straight-down negative The brightness control area interval of backlight is consistent, on the basis of product design brightness and given threshold.

In addition, the present invention also provides a kind of device for compensating display screen mura defect, including sequentially connected image is adopted Collect unit, relative luminance processing unit, image filtering unit, brightness bias compensation unit and feedback calibration unit, wherein

Described image acquisition unit is used to shoot display screen and shows the image of black picture, and is converted to digital picture；

The relative luminance processing unit is used to enhance the contrast of acquisition image, highlights the mura defect of image；

Described image filter unit is used for the characteristic image by filtering processing acquisition image zooming-out mura, obtains mura and lacks Fall into administrative division map；

The brightness bias compensation unit obtains brightness bias compensation figure for being sampled to the characteristic image of mura；

The feedback calibration unit is used to read brightness bias compensation value according to brightness bias compensation figure, according to the brightness The control driving of bias compensation value reduces the LED luminance in the corresponding region mura.

Optionally, described image filter unit uses median filtering, bilateral filtering or gaussian filtering.

Optionally, the display screen uses direct-type backlight.

Therefore using the present embodiment technical solution, due to the technology using local dimming technology compensation mura defect Scheme reduces the requirement to display screen mura specification, improves display even results.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art To obtain other drawings based on these drawings.

Fig. 1 is a kind of side entrance back schematic diagram provided by the invention；

Fig. 2 is a kind of direct-type backlight schematic diagram provided by the invention；

Fig. 3 is a kind of method stream that display screen mura defect is compensated using local dimming technology provided by the invention Cheng Tu；

Fig. 4 is a kind of acquisition image provided by the invention；

Fig. 5 is that acquisition image carries out relative luminanceization treated effect in Fig. 4；

Fig. 6 is that acquisition image carries out the background image after gaussian filtering in Fig. 4；

Fig. 7 is the mura characteristic image that Fig. 6 and Fig. 5 subtract each other；

Fig. 8 is mura characteristic image sampling figure in Fig. 7；

Fig. 9 is brightness bias compensation figure.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.