Pixel Electrode Branch Angles for LCD Color Cast Reduction
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Solution Overview
Problem
Conventional liquid crystal displays using the vertical display mode suffer from color distortion under large viewing angles due to the division of pixel electrodes into regions, leading to reduced aperture ratio and brightness, which negatively impacts light transmittance.
Innovation Solution
A pixel electrode design featuring orthogonal trunks and branches arranged in a rectangular coordinate system with specific acute angles between the branches and the trunks, allowing for controlled liquid crystal alignment to improve display quality under various viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pixel electrode is divided into multiple regions to reduce color distortion, then color cast is reduced, but the aperture ratio is reduced
Solution Approach 1:
The pixel electrode is segmented into multiple regions (first region, second region, third region, fourth region) with different voltage control, allowing independent adjustment of liquid crystal alignment in each region to reduce color distortion while maintaining overall pixel area
Solution Approach 2:
Different regions of the pixel electrode are assigned different electrical characteristics and voltage levels to achieve locally optimized liquid crystal alignment, where each region has tailored properties for its specific viewing angle requirements
2Ease of manufacture
If the pixel is divided into two parts for low color cast design, then color distortion is reduced, but the effective potential of liquid crystal is reduced
Solution Approach 1:
The pixel is divided into main area and subarea with separate voltage control through different thin film transistors, allowing the main area to maintain higher effective potential for brightness while the subarea is optimized for color cast reduction
Solution Approach 2:
The main area and subarea are assigned different electrical properties and voltage levels, where the main area preserves high effective potential for brightness while the subarea provides color cast compensation
3Ease of manufacture
If the pixel is divided into two parts, then color cast is reduced, but the light transmittance is reduced
Solution Approach 1:
The pixel structure is segmented into regions that can be independently controlled, allowing the main area to contribute more to light transmittance while the subarea provides color cast reduction functionality
Solution Approach 2:
Different regions are assigned different functional qualities where the main area optimizes for light transmittance and the subarea optimizes for color cast reduction, achieving both goals simultaneously
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
The pixel electrode significantly enhances display quality by reducing color distortion and improving light transmittance, particularly at unsatisfactory viewing angles, offering flexibility and adaptability in production and use for different display devices.
Implementation Method 1
The alignment of the liquid crystal can be controlled by the angles of the branches or silts of the pixel electrode
Data Source
AI summary
In the technical field of liquid crystal display, a pixel electrode and a liquid crystal display are provided. The pixel electrode comprises a first trunk and a second trunk formed as an elongated linear member, said first trunk and said second trunk being orthogonal to each other, and a plurality of branches each formed as an elongated linear member and extending from the first trunk or the second trunk, wherein an acute angle θ formed between either branch and the first trunk satisfies the following relationship: 0°<θ<45° or 45°<θ<90°.