Pixel Structure Light-Shielding Pattern View Angle Color Shift
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Solution Overview
Problem
Conventional MVA LCDs experience view-angle induced color shift and color washout due to varying transmittance with changes in view angle, which existing solutions only partially address.
Innovation Solution
A pixel structure with sub-pixels featuring a light-shielding pattern, where the areas of the light-shielding portions and sub-pixels are optimized to satisfy specific ratios, allowing for controlled transmittance changes and reduced color shift by modulating the light leakage at different view angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel structure uses conventional MVA LCD design, then wide view angle is achieved, but color shift and color washout occur due to varying transmittance with view angle changes
Solution Approach 1:
The patent applies local quality by creating different light-shielding patterns for different sub-pixels (red, green, blue). Each sub-pixel has a specific light-shielding area ratio designed to compensate for its particular color shift characteristics at oblique view angles. This localized differentiation allows each color channel to be optimized independently, maintaining overall color accuracy across the viewing cone.
Solution Approach 2:
The patent changes the light-shielding area parameter for different sub-pixels to compensate for view-angle induced color shift. By adjusting the light-shielding area ratio (e.g., 10-30% for red sub-pixels, 5-20% for green sub-pixels, 5-15% for blue sub-pixels), the transmittance characteristics are modified to counteract the natural color shift that occurs at oblique angles, thereby maintaining color accuracy.
2Reliability
If light-shielding pattern area is increased to reduce color shift, then color accuracy improves, but transmittance and brightness decrease
Solution Approach 1:
The patent optimizes the light-shielding area parameter to achieve the minimum necessary shielding for color correction. By carefully selecting the light-shielding area ratio (10-30% for red, 5-20% for green, 5-15% for blue sub-pixels), the patent achieves color accuracy improvement while minimizing the impact on overall transmittance and brightness.
Solution Approach 2:
The patent applies light-shielding patterns selectively to specific sub-pixels based on their individual color shift characteristics. Not all sub-pixels receive the same treatment - each is optimized locally, which means light shielding is applied only where necessary for color correction, preserving brightness in areas where it is not needed.
3Reliability
If light-shielding pattern is added to sub-pixels, then color shift is reduced, but device complexity increases
Solution Approach 1:
The patent uses simple geometric light-shielding patterns (such as rectangular or triangular regions) positioned at specific locations within each sub-pixel. These localized patterns are straightforward to fabricate using standard LCD manufacturing processes, adding minimal complexity while effectively addressing color shift in the critical disclination areas.
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
Significantly reduces view-angle induced color shift and maintains accurate color tones by controlling the ratio of red light, preventing overly reddish or yellowish skin tones when viewed at large angles compared to normal angles.
Implementation Method 1
a light-shielding pattern includes a first light-shielding portion and a second light-shielding portion intersecting with each other
Data Source
AI summary
A pixel structure includes a plurality of sub-pixels arranged in an array. Each of the sub-pixels includes an active device and a pixel electrode electrically connected to the active device. A disclination area and a plurality of domains separated by the disclination area are defined in each of the pixel electrodes, respectively. Here, only a portion of the sub-pixels further includes a light-shielding pattern arranged corresponding to the disclination area.