LCD Pixel Electrode Layout for Side-View Gamma Balance
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Solution Overview
Problem
Conventional liquid crystal display devices exhibit color distortion at different view angles due to differences in side view gamma values of blue pixel units compared to red and green pixel units, particularly at low and medium gray scales, leading to poor display quality and view angle characteristics.
Innovation Solution
Differentially design the width and gap widths of branch electrodes for red, green, and blue pixel units, with narrower branch electrodes and wider gaps for blue pixel units, and adjust driving voltages based on spatial frequency and ambient light conditions to balance gamma values across different view angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform branch electrode width and gap width are used for all pixel units, then manufacturing is simplified, but side view gamma values differ significantly causing color distortion
Solution Approach 1:
The patent applies local quality by differentiating branch electrode width and gap width parameters specifically for blue pixel units compared to red and green pixel units. Blue pixel units have narrower branch electrodes and wider gaps, while red and green pixel units have wider branch electrodes and narrower gaps. This localized parameter differentiation addresses the specific gamma value issues of blue pixels at side view angles without requiring complete redesign of all pixel units, thus balancing manufacturing complexity with performance improvement.
2Manufacturing precision
If blue pixel units have narrower branch electrodes and wider gaps, then side view gamma values are balanced, but electrode structure becomes more complex
Solution Approach 1:
The patent employs asymmetry by creating non-uniform electrode structures where blue pixel units have asymmetric dimensions (narrower width, wider gap) compared to red and green pixel units. This asymmetric design specifically targets the gamma value imbalance in blue pixels at side view angles. The asymmetry is applied selectively only to blue pixel units, maintaining symmetric uniform structures for red and green pixel units, thereby reducing overall device complexity while achieving the desired gamma balance.
3Reliability
If different branch electrode dimensions are used for different pixel units, then view angle characteristics are improved, but manufacturing difficulty increases
Solution Approach 1:
The patent applies segmentation by dividing the pixel unit population into distinct groups (blue pixel units vs. red/green pixel units) and applying different electrode dimension parameters to each segment. This segmentation allows targeted optimization of blue pixel gamma values at side view angles while maintaining simpler, uniform structures for red and green pixels. The segmentation approach manages manufacturing complexity by limiting differential design to only the problematic blue pixel segments rather than requiring complete parameter differentiation across all pixel types.
Data Source
AI summary
The present disclosure provides a liquid crystal display device where a width of each of the branch electrodes of one of the main pixel electrode and the secondary pixel electrode of each of the blue pixel units is less than the width of the each of the branch electrodes of the one of the main pixel electrode and the secondary pixel electrode of the each of the red pixel units and the green pixel units, and a width of each of the branch electrodes of another of the main pixel electrode and the secondary pixel electrode of each of the blue pixel units is less than the width of the each of the branch electrodes of the another of the main pixel electrode and the secondary pixel electrode of the each of the red pixel units and the green pixel units.