Asymmetric Electrode Connection for LCD Brightness Uniformity
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Solution Overview
Problem
Conditional twisted nematic liquid-crystal display devices suffer from insufficient viewing angle and brightness due to liquid-crystal molecules with different alignment directions, leading to dark or bright stripes on the display screen, which detract from image quality.
Innovation Solution
The display device features an array substrate with a first electrode and a second electrode, where the second electrode includes a finger portion and a connection portion with specific geometric features such as acute and obtuse angles, concavities, and inflection points, designed to reduce the area of liquid-crystal molecules with alignment directions different from most, thereby enhancing liquid-crystal efficiency and reducing brightness non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional liquid-crystal display devices are used, then the structure is simple, but the viewing angle is insufficient and brightness is reduced due to misaligned liquid-crystal molecules
Solution Approach 1:
The connection portion of the second electrode is designed with asymmetric geometry, where the first width along the gate-line-extending direction is smaller than the second width. This asymmetric design creates different alignment conditions for liquid-crystal molecules at different regions, reducing the number of misaligned molecules and improving brightness uniformity across the display screen
Solution Approach 2:
The connection portion incorporates specific geometric features (concavities or inflection points) at localized positions to create controlled alignment regions. The first concavity/inflection point is positioned at a greater distance from the edge than the second concavity/inflection point, creating localized quality variations that guide liquid-crystal molecule alignment and reduce misalignment effects
2Reliability
If liquid-crystal molecules with different alignment directions are present, then the device structure is simpler, but dark or bright stripes appear on the display screen
Solution Approach 1:
The asymmetric width design of the connection portion (first width smaller than second width) creates non-uniform electric field distribution that compensates for the alignment issues of liquid-crystal molecules, reducing the formation of dark or bright stripes and improving display quality
Solution Approach 2:
The connection portion incorporates concavities or inflection points that introduce curvature features to the otherwise linear electrode geometry. These curved features modify the electric field lines and improve the alignment of liquid-crystal molecules, reducing stripe defects in the display
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 increases liquid-crystal efficiency, reduces brightness non-uniformity, and improves display quality by minimizing the number of liquid-crystal molecules with misaligned directions, resulting in enhanced image brightness and reduced dark or bright stripes.
Implementation Method 1
Liquid-crystal molecules have different light polarization or light refraction effects at different alignment configurations
Implementation Method 2
Liquid-crystal molecules have different light polarization or light refraction effects at different alignment configurations
Data Source
AI summary
A display device is provided. The display device includes an array substrate including a substrate and a first electrode having an opening, wherein the opening has an edge. The array substrate further includes a second electrode disposed over the first electrode and including a first finger portion having a first side and a second side opposite to the first side. The second electrode further includes a connection portion connecting the first finger portion at the edge, wherein the connection portion has a first concavity at the first side and a second concavity at the second side, and a length of the first concavity is greater than a length of the second concavity. The display device further includes an opposite substrate and a display medium.