Inclined Pixel Electrode Design for LCD Short Circuit Prevention
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Solution Overview
Problem
Conventional liquid crystal display devices using in-plane switching face challenges in preventing direct short circuits between pixel electrodes and data lines, leading to reduced yield due to close proximity and increased manufacturing defects.
Innovation Solution
The design incorporates pixel electrodes with inclined edges that extend towards data lines and a common electrode with slits, allowing for electrical connection via switching devices, which reduces the likelihood of short circuits by varying the distance between electrode edges and data lines, and generates a horizontal electric field to control liquid crystal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixel electrodes are placed as widely as possible to improve transmittance, then transmittance is improved, but the interval between pixel electrode edges and data lines becomes extremely short, increasing the possibility of short circuit
Solution Approach 1:
The pixel electrode edges are designed with asymmetric inclination angles relative to the data lines. Specifically, one edge has a first inclination angle and the other edge has a second inclination angle that differs from the first, creating an asymmetric configuration that optimizes both transmittance and short circuit resistance
Solution Approach 2:
Different regions of the pixel electrode are designed with different local characteristics. The edges adjacent to data lines have specific inclination angles optimized for preventing short circuits, while other portions of the pixel electrode maintain configurations optimized for transmittance, allowing each region to perform its specific function optimally
2Area of moving object
If pixel electrodes are placed close to data lines to maximize electrode area, then electrode area is increased, but manufacturing precision decreases due to increased short circuit risk
Solution Approach 1:
The pixel electrode is designed with asymmetric edge inclinations where edges adjacent to data lines have specific angles optimized for manufacturing tolerance. This asymmetric design allows the electrode to maintain large area while the inclined edges create a geometric buffer that reduces short circuit risk during manufacturing variations
Solution Approach 2:
Instead of increasing electrode area by extending edges parallel to data lines (which reduces spacing), the invention uses inclined edges that extend in a different dimensional orientation. This allows the electrode to achieve larger effective area while the inclination angle provides a safety margin against short circuits in the lateral dimension
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 configuration enhances the resistance to direct short circuits, improving manufacturing yield and maintaining uniform brightness and expanded viewing angles by minimizing the probability of electrical shorts between pixel electrodes and data lines.
Implementation Method 1
The electric field controls each liquid crystal molecule to align substantially in parallel to the substrate surface
Implementation Method 2
liquid crystal molecules are aligned substantially in parallel to a substrate surface by rotation control
Data Source
AI summary
A liquid crystal display device comprising: a liquid crystal layer provided between a first substrate and a second substrate; first electrodes, which are formed above the first substrate as a first layer, each first electrode having a side which extends to incline toward a first direction in which the data line extends, that is, second direction, each first electrode electrically connected to corresponding data line via corresponding switching device; and a second electrode, which is formed above the first substrate as a second layer, having a slit in each part of the area overlapping with corresponding first electrode, at least one side of the slit extending in the second direction.