Pixel Driving Method for LCD Viewing-Angle Color Shift
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Solution Overview
Problem
Large-size LCD display panels using negative type vertical alignment (VA) liquid crystal technology face significant viewing-angle color shift issues due to the rapid brightness saturation of blue sub-pixels, leading to image color bias when viewed from different angles.
Innovation Solution
A pixel driving method that divides blue sub-pixels into sets and pairs, applying alternating voltage signals with different weighting coefficients to each sub-pixel to maintain consistent brightness across viewing angles, eliminating the need for primary and secondary pixel designs that increase backlight cost and reduce penetration rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If VA-type liquid crystal technology is used to achieve high production efficiency and low manufacturing cost, then production efficiency and manufacturing cost are improved, but viewing angle color shift performance deteriorates
Solution Approach 1:
The patent divides blue sub-pixels into multiple groups (first blue sub-pixels, second blue sub-pixels, third blue sub-pixels) and applies different voltage signals to each group. This segmentation allows independent control of blue sub-pixel brightness to compensate for viewing angle color shift while maintaining the VA liquid crystal technology's production efficiency and cost advantages.
Solution Approach 2:
The patent applies different voltage signals (first voltage signal, second voltage signal, third voltage signal) to different groups of blue sub-pixels based on their specific positions and viewing angle characteristics. This local quality approach enables precise compensation for color shift in different regions without affecting the entire display panel's manufacturing simplicity.
2Illumination intensity
If blue sub-pixels are driven with high voltage to increase brightness, then brightness is improved, but viewing angle color shift deteriorates due to rapid brightness saturation
Solution Approach 1:
The patent dynamically adjusts the voltage signals applied to different groups of blue sub-pixels based on grayscale values and viewing angle requirements. By making the voltage signals adaptive rather than fixed, the system maintains optimal brightness while preventing the rapid saturation that causes color shift in side viewing angles.
Solution Approach 2:
The patent changes the voltage parameters (different voltage levels, different signaling patterns) applied to different blue sub-pixel groups to control their brightness characteristics. This parameter adjustment allows the system to achieve desired brightness while compensating for viewing angle color shift by modifying how blue sub-pixels respond to voltage inputs.
3Ease of manufacture
If primary and secondary pixel designs are used to solve viewing angle color shift, then color shift is improved, but penetration rate decreases and backlight cost increases
Solution Approach 1:
The patent replaces the mechanical/structural approach of using separate primary and secondary pixels with an electrical control approach. By using different voltage signals to control blue sub-pixel groups, the system achieves color shift compensation without adding physical structures that would block light, thereby maintaining high penetration rate and avoiding increased backlight costs.
Data Source
AI summary
A pixel driving method includes: dividing blue subpixels on a display panel into multiple blue pixel sets; acquiring original driving data of each of the blue pixel sets an average thereof; acquiring unequal first and second voltage signals corresponding to the original driving data of each blue subpixel according to the average; dividing the blue subpixels of each blue pixel set into sets of blue pixel pairs comprising neighboring first and second blue subpixels; acquiring a first brightness signal according to the first voltage signal of the first blue subpixel and multiple first voltage signals of the neighboring blue subpixels and according to different weighting coefficients, and driving the first blue subpixel; and acquiring a second brightness signal according to the second voltage signal of the second blue subpixel and multiple second voltage signals of the neighboring blue subpixels and according to different weighting coefficients.