Pixel Electrode Stripe Spacing for LCD Color Shift
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Solution Overview
Problem
Wide view angle liquid crystal display panels experience color shift and inadequate color saturation due to varying light transmittance at different viewing angles, which is exacerbated by design features that compromise aperture ratio for high resolution displays.
Innovation Solution
The pixel structure includes sub-pixels with pixel electrodes featuring stripe patterns with varying spacings, allowing for adjusted light transmittance to mitigate color shift at side views while maintaining an ideal aperture ratio by increasing spacings of certain stripe patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the spacing of stripe patterns is increased to improve light transmittance and reduce color shift at side views, then the color saturation and brightness consistency improve, but the aperture ratio decreases due to larger gaps between patterns
Solution Approach 1:
The patent applies local quality by differentiating the spacing of stripe patterns across different sub-pixels. Specifically, the blue sub-pixel has larger stripe spacing than the red and green sub-pixels, creating localized optical property variations that compensate for the blue sub-pixel's naturally lower light transmittance at side views, thereby achieving color balance without uniformly reducing aperture ratio
Solution Approach 2:
The patent changes the spacing parameter of stripe patterns selectively for different sub-pixels to optimize light transmittance. By adjusting the spacing parameter locally (larger for blue, smaller for red and green), the invention achieves consistent color saturation across viewing angles while maintaining overall aperture ratio
2Device complexity
If a single pixel electrode per sub-pixel is used to maintain electrical simplicity, then the device complexity is reduced, but color shift at side views occurs due to uniform light transmittance across all sub-pixels
Solution Approach 1:
The patent maintains simple single pixel electrode configuration per sub-pixel (avoiding complex multi-electrode designs) while introducing local quality variations through differentiated stripe pattern spacings. This allows each sub-pixel to have optimized light transmittance characteristics without increasing overall device complexity
Solution Approach 2:
The patent segments the stripe pattern spacing parameter across different sub-pixels (red, green, blue) with each having distinct spacing values. This segmentation enables independent optimization of light transmittance for each color channel while maintaining the simplicity of single pixel electrodes, resolving the color shift issue without complicating the electrode structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces color shift at side views by enhancing light transmittance and aperture ratio, ensuring consistent image brightness and color saturation across viewing angles without compromising display quality.
Implementation Method 1
The liquid crystal display panel, with its good spatial utilization, low power consumption and radiation-free and other distinguished features, has gradually become the mainstream in the display device market
Data Source
AI summary
A pixel structure including a plurality of sub-pixels arranged in array is provided. Each of the sub-pixels includes an active device and a pixel electrode electrically connected to the active device respectively. Each of the pixel electrodes includes a plurality of stripe patterns respectively, and spacings of at least one portion of the stripe patterns of at least one of the sub-pixels are larger than spacings of the stripe patterns of the other sub-pixels.