Pixel Driving Method for VA Display Graininess Reduction
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Solution Overview
Problem
Vertical Alignment (VA) liquid crystal technology in large-sized display panels suffers from graininess and poor optical properties, especially at large viewing angles, due to the alternation of bright and dark sub-pixels, which affects image quality and color accuracy.
Innovation Solution
A pixel driving method that acquires an average pixel signal of sub-pixels in each unit pixel, determines the color signal based on this average, and loads specific gray-scale signals to sub-pixels according to a preset rule to minimize graininess, improving display quality by controlling the proportion and lightness of high and low gray-scale voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If VA liquid crystal technology is used for large-sized display panels, then production efficiency and cost are improved, but optical properties deteriorate at large viewing angles causing graininess and color shift
Solution Approach 1:
The patent applies local quality by differentiating the treatment of sub-pixels based on their spatial location and color type. Different gray-scale signals are applied to different sub-pixels within the same pixel block, creating local variations in voltage application that compensate for viewing angle effects while maintaining overall image coherence.
Solution Approach 2:
The patent changes the voltage parameters applied to sub-pixels dynamically based on the displayed color content. By adjusting gray-scale voltage levels according to color signals (red, green, blue channels) and viewing angle conditions, the system optimizes optical properties without sacrificing production efficiency.
2Reliability
If different gray-scale voltages are applied to adjacent sub-pixels to improve viewing angle, then optical property is improved, but graininess increases due to alternation of bright and dark sub-pixels
Solution Approach 1:
Different gray-scale signals are applied to different sub-pixels based on their color type (red, green, blue) and position within the pixel block. This localized differentiation improves viewing angle performance while the overall averaging effect across the pixel block reduces visible graininess.
Solution Approach 2:
The patent applies gray-scale voltage adjustment selectively to certain sub-pixels rather than uniformly to all sub-pixels. By applying different voltage adjustments only where needed (based on color signal and position), it achieves viewing angle improvement while minimizing the generation of graininess artifacts.
Data Source
AI summary
A pixel driving method is provided. The method includes: acquiring an average pixel signal of sub-pixels of each color in each unit pixel in a pixel block, where the unit pixel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel; acquiring a color signal of the pixel block according to the average pixel signal of the sub-pixels of each color; determining a color that the pixel block deflects to during display according to the color signal and a preset main color-rendering determination condition, and loading first-type gray-scale signals to a part of same-color sub-pixels in the pixel block and loading second-type gray-scale signals to the remaining same-color sub-pixels based on a preset rule according to the determination result, where the first-type gray-scale signals are not equal to the corresponding second-type gray-scale signals.