IPS LCD Electrode L-Shaped Patterns for Electric Field Uniformity
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Solution Overview
Problem
In-plane switching mode liquid crystal display devices face issues with non-uniform electric field direction, leading to inefficient driving regions and disclination regions, which deteriorate transmittance and contrast ratio.
Innovation Solution
The design includes gate lines and data lines crossing on a substrate with thin film transistors, first common lines on the same layer, and electrodes with L-shaped and |-shaped patterns at their ends, which overlap with common lines to improve electric field uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrode patterns are used in in-plane switching mode, then the device structure is simple, but non-uniform electric field direction causes inefficient driving regions and disclination regions, deteriorating transmittance and contrast ratio
Solution Approach 1:
The electrode patterns are designed with different local geometries (L-shaped protruded patterns at ends of first fingers, |-shaped patterns at ends of second fingers) to locally correct the electric field direction in specific regions. This local quality modification ensures uniform electric field distribution across the pixel region while maintaining overall structural simplicity
Solution Approach 2:
The invention introduces asymmetric electrode patterns where the first and second electrodes have different shapes (L-shaped versus |-shaped). This asymmetry is deliberately designed to compensate for the non-uniform electric field distribution that would otherwise occur in symmetric conventional designs, achieving uniform electric field direction without excessive complexity
2Illumination intensity
If electrode fingers are extended to cover entire pixel regions, then electric field coverage is improved, but disclination regions and inefficient driving regions increase, reducing transmittance and contrast ratio
Solution Approach 1:
Instead of uniformly extending electrodes across the entire pixel region, the invention applies specific geometric modifications (L-shaped and |-shaped patterns) only at the ends of the electrode fingers where electric field non-uniformity occurs. This localized approach improves electric field coverage and reduces disclination regions without causing the harmful effects of excessive electrode extension
3Illumination intensity
If common lines are positioned to optimize electric field distribution, then transmittance improves, but manufacturing alignment precision requirements increase
Solution Approach 1:
The common lines are positioned to overlap with specific regions of the electrode patterns (the L-shaped and |-shaped protruded patterns) rather than requiring precise alignment with the entire electrode structure. This localized overlap requirement reduces the overall alignment precision burden while still achieving the benefit of improved electric field distribution and enhanced transmittance
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 significantly reduces inefficient driving and disclination regions, enhancing transmittance and contrast ratio by up to 50% or more.
Implementation Method 1
an in-plane switching mode to control the liquid crystal directors by a horizontal electric field
Data Source
AI summary
A liquid crystal display device of an in-plane switching mode and a method for manufacturing the same are disclosed. The liquid crystal display device of an in-plane switching mode includes gate lines and data lines which cross each other on a substrate to define pixel regions, thin film transistors which are formed at crossing portions of the gate lines and the data lines, first common lines formed on the same layer as the gate lines, first electrode fingers which have a plurality of diverged first fingers and include L-shaped protruded patterns at one ends of the first fingers in the pixel regions, and second electrode fingers which have second fingers formed alternately with the first fingers and include |-shaped patterns at one ends of the second fingers in the pixel regions, wherein the L-shaped protruded patterns and the |-shaped patterns overlap partly with the first common lines.