LCD Brightness Mura Elimination via Pixel Gray Scale Compensation
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Solution Overview
Problem
Liquid crystal displays (LCDs) often suffer from brightness mura defects due to uneven backlight distribution, leading to uneven brightness and visible patches or traces during pure color displays, which negatively impact user experience.
Innovation Solution
A method and device that determine a compensation coefficient for each pixel based on its original gray scale value, calculating a compensation gray scale value to adjust the image display, thereby eliminating brightness mura defects by outputting the image according to these adjusted values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If backlight distribution is used directly without compensation, then the display structure is simple, but brightness uniformity deteriorates causing mura defects
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation coefficients for different gray scale values before actual display operation. The processing unit determines compensation coefficients based on measured backlight distribution characteristics, then uses these pre-determined coefficients to compensate pixel gray scale values during display, eliminating the need for real-time complex calculations and hardware modifications.
Solution Approach 2:
The patent changes the parameter of gray scale values by applying compensation coefficients to adjust the brightness output of each pixel. The processing unit modifies the original gray scale values based on the determined compensation coefficients, transforming the parameter to achieve uniform brightness across the display while accounting for backlight distribution variations.
2Manufacturing precision
If compensation coefficients are calculated for each pixel, then brightness uniformity is improved, but processing complexity increases
Solution Approach 1:
The patent reduces processing complexity by performing the complex coefficient determination operation in advance. The processing unit calculates compensation coefficients based on backlight distribution characteristics and stores them for subsequent use, avoiding the need for complex real-time calculations during actual display operation.
Solution Approach 2:
The patent uses a lookup table approach where pre-calculated compensation coefficients are stored and copied during display operation. Instead of recalculating coefficients for each pixel in real-time, the system retrieves pre-determined coefficients from storage, significantly reducing processing complexity while maintaining brightness uniformity.
3Productivity
If no compensation is applied, then processing speed is fast, but display quality deteriorates with visible patches and traces
Solution Approach 1:
The patent maintains fast processing speed by performing compensation coefficient determination in advance and storing the results. During actual display operation, the system only needs to retrieve pre-calculated coefficients and apply them to pixel values, which is a simple and fast operation that preserves processing speed while improving display quality.
Data Source
AI summary
The present application discloses a method and a device for eliminating a brightness mura defect of a liquid crystal display, and relates to the technical field of liquid crystal displays. The method disclosed by the present application includes the following steps: acquiring an image to be displayed, wherein the image to be displayed includes a plurality of pixels; determining a compensation coefficient corresponding to each channel of each of the pixels according to an original gray scale value corresponding to each channel of each of the pixels; calculating a compensation gray scale value corresponding to each channel of each of the pixels according to the original gray scale value and the compensation coefficient corresponding to each channel of each of the pixels; and outputting and displaying the image to be displayed according to the compensation gray scale value corresponding to each channel of each of the pixels.