Staggered Slit LCD Electrode Pattern for VA Mode
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Solution Overview
Problem
Liquid crystal display (LCD) devices with vertical alignment (VA) mode face challenges in forming multiple domains within a pixel due to 'open' defects caused by over-etching of slits, leading to increased resistance and potential defects from resistance heat, which affect display quality and transmittance.
Innovation Solution
A novel electrode pattern featuring slits with extension portions that are staggered relative to their central portions, ensuring sufficient gaps between slits to prevent 'open' defects and uniform voltage application, thereby improving display quality without compromising transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-shaped slits are formed on the upper electrode to create multiple domains, then domain division is achieved and viewing angle is improved, but gaps between slits become narrow causing open defects and increased resistance
Solution Approach 1:
The patent applies asymmetry by designing slits with different lengths in different directions. Specifically, the slits have first extension portions extending in a first direction and second extension portions extending in a second direction perpendicular to the first direction, with the second extension portions being longer than the first extension portions. This asymmetric design creates staggered gaps between adjacent slits, preventing open defects while maintaining domain division capability.
2Manufacturing precision
If slits are formed with narrow gaps to achieve precise domain control, then domain alignment is improved, but over-etching occurs causing open defects and regional resistance increases
Solution Approach 1:
The asymmetric slit design with staggered gaps prevents over-etching from causing open defects. The gaps between adjacent slits are designed to be staggered rather than aligned, which provides manufacturing tolerance and prevents complete electrode separation even if over-etching occurs in certain regions.
Solution Approach 2:
The patent applies local quality by making different portions of the slits have different characteristics. The first extension portions and second extension portions have different lengths, creating locally optimized gap structures that prevent open defects in critical areas while maintaining precise domain alignment in display areas.
3Reliability
If slit gaps are widened to prevent open defects, then electrode reliability is improved, but transmittance decreases
Solution Approach 1:
The asymmetric design allows the slits to have extended portions in perpendicular directions with different lengths. This creates staggered gaps that provide sufficient spacing to prevent open defects and resistance heat generation, while the overall slit area is optimized to minimize impact on light transmittance.
Solution Approach 2:
The patent addresses the gap width problem by introducing a dimensional solution - extending slits in perpendicular directions (first and second directions) rather than simply widening gaps in one direction. This multi-directional extension approach prevents open defects through staggered gap configuration while maintaining better light transmittance compared to uniform gap widening.
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 prevents 'open' defects and regional resistance increases, ensuring uniform voltage application and enhanced reliability of the LCD device with improved display quality and transmittance.
Implementation Method 1
The LCD displays an image by controlling the polarization of light incident thereupon
Implementation Method 2
The LCD generates an electric field and determines an alignment direction of liquid crystal molecules in the liquid crystal layer by applying a voltage to the field-generating electrodes
Implementation Method 3
a plurality of domains may be formed by allowing liquid crystal molecules to be realigned due to a fringe field formed between edges of the cutouts and the field-generating electrode facing the edges
Data Source
AI summary
An LCD includes: pixel electrodes; a common electrode including a plurality of slits; and a liquid crystal layer interposed between the pixel electrodes and the common electrode. The plurality of slits include a first slit and a second slit that are disposed adjacent to each other in a first direction. The first slit includes a first central portion and a first extension portion extending from the first central portion toward the second slit, and the second slit includes a second central portion and a first extension portion extending from the second central portion toward the first slit. An end of the first extension portion of the first slit and an end of the first extension portion of the second slit are spaced apart from each other; and disposed, in a staggered manner, on opposite sides of an imaginary center line connecting the first central portion and the second central portion.