Sub-Pixel Gamma Voltage Control for Low-Gray-Scale Display Quality
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Solution Overview
Problem
Existing display technologies face issues of attenuation and uneven gray scale transition at low gray scale monochrome brightness due to parasitic capacitance and lateral leakage between sub-pixels.
Innovation Solution
A method for optimizing image quality by controlling and setting actual data voltages for sub-pixels with different colors during the gamma adjustment phase, ensuring that at least two of these voltages differ to adjust the gamma curve and minimize luminance differences with a standard gamma curve. In the display phase, these adjusted voltages are applied when the gray scale value is 0.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the same data voltage is applied to all sub-pixels at grey scale 0, then the manufacturing process is simple, but luminance uniformity and gamma curve accuracy deteriorate due to parasitic capacitance and lateral leakage
Solution Approach 1:
The patent applies different data voltages to different sub-pixels (red, green, blue) at grey scale 0 based on their specific characteristics. This local differentiation compensates for parasitic capacitance and lateral leakage effects that vary by sub-pixel type, improving luminance uniformity without requiring complex hardware modifications.
Solution Approach 2:
The patent modifies the data voltage parameter for different sub-pixels during the gamma adjustment phase. By changing the voltage parameters specifically for red, green, and blue sub-pixels, the gamma curve accuracy is improved while maintaining a relatively simple control structure.
2Measurement precision
If standard gamma adjustment is used without sub-pixel differentiation, then the control process is simple, but luminance accuracy and gray scale transition uniformity deteriorate at low brightness
Solution Approach 1:
The patent segments the gamma adjustment process by sub-pixel type (red, green, blue). Each sub-pixel type undergoes separate voltage measurement and adjustment, allowing precise compensation for their respective parasitic capacitance and lateral leakage characteristics, thereby improving luminance accuracy.
Solution Approach 2:
The patent performs preliminary measurement and voltage adjustment for each sub-pixel type during the gamma adjustment phase before actual display operation. This preliminary calibration ensures that the correct voltages are stored and applied during normal operation, improving luminance accuracy without adding complexity to real-time control.
Data Source
AI summary
A method for optimizing image quality and a module for optimizing image quality are provided. The method includes: in a gamma adjustment phase, controlling and setting respective actual data voltages corresponding to a grey scale 0 of sub-pixels having different colors, and controlling at least two of the actual data voltages corresponding to the grey scale 0 of the sub-pixels having different colors to be different from each other, to control a gamma curve of the sub-pixels to make an absolute value of a luminance difference between the luminance of the gamma curve corresponding to each grey scale value and the luminance of a standard gamma curve corresponding to the grey scale value less than a predetermined luminance difference; and in a display phase, when a grey scale value provided to sub-pixels having different colors is 0, applying the corresponding actual data voltages to the sub-pixels having different colors.