Pixel Structure with Asymmetric Liquid Crystal Tilt Angles
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Solution Overview
Problem
Conventional liquid crystal displays exhibit strong viewing angle dependency, leading to significant color casts when transitioning from low to high gray scales, due to the liquid crystal's vertical to horizontal state change, which affects display performance.
Innovation Solution
A pixel structure comprising subpixels with different tilt angles and applied voltages, utilizing a bidirectional thin film transistor and bleeder portions to control liquid crystal tilt angles, thereby reducing color casts by enhancing viewing angle dependency and visual compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal molecules are arranged vertically to achieve high contrast and quick response, then display performance is improved, but viewing angle dependency increases causing color casts
Solution Approach 1:
The pixel electrode is divided into multiple independent electrode regions with different orientations. Each region contains liquid crystal molecules tilted at different angles relative to the substrate normal, creating multiple domains within a single pixel. This segmentation allows different viewing angles to be compensated independently, reducing overall color casts while maintaining high contrast and quick response characteristics.
Solution Approach 2:
The invention introduces asymmetric tilt angles for liquid crystal molecules in different electrode regions. Instead of uniform vertical alignment, the liquid crystal molecules are tilted at specific asymmetric angles (e.g., 20°, 40°, 60°) relative to the substrate normal. This asymmetric arrangement creates viewing angle compensation effects that reduce color casts while preserving the high contrast and fast response benefits of vertical alignment.
2Ease of operation
If liquid crystal changes from vertical state to horizontal state to achieve gray scale transition, then gray scale control is enabled, but color casts increase due to strong viewing angle dependency
Solution Approach 1:
The pixel electrode is divided into multiple independent electrode regions with different orientations. Each region contains liquid crystal molecules tilted at different angles relative to the substrate normal, creating multiple domains within a single pixel. This segmentation allows different viewing angles to be compensated independently, reducing overall color casts while maintaining high contrast and quick response characteristics.
Solution Approach 2:
The invention changes the tilt angle parameter of liquid crystal molecules in different electrode regions. By setting specific tilt angles (e.g., 20°, 40°, 60°) for molecules in different regions, the patent creates parameter diversity that compensates for viewing angle effects. This parameter change approach enables gray scale control while reducing color casts across different viewing angles.
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 solution effectively reduces color casts and improves visual compensation across various viewing angles by controlling liquid crystal deflection angles, facilitating a more stable and optimal display performance.
Implementation Method 1
different voltages are applied to the first subpixel and the second subpixel
Implementation Method 2
control liquid crystal tilt angles, thereby reducing color casts by enhancing viewing angle dependency and visual compensation
Implementation Method 3
a first horizontal trunk line and a first domain line, and an angle between the first horizontal trunk line and the first domain line is a first angle
Data Source
AI summary
A pixel structure, a display panel and a display device are disclosed. The pixel structure includes: a first subpixel, including a first horizontal trunk line and a first domain line that form a first angle; and a second subpixel, including a second horizontal trunk line and a second domain line that form a second angle.