Unparallel End Electrodes for Display Substrate Mura Reduction
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Solution Overview
Problem
Conventional fringe field switching (FFS) type display devices suffer from obvious trace mura issues due to non-uniform electric field distribution and liquid crystal molecule deflection in the end regions of the electrodes.
Innovation Solution
The design includes at least two display electrodes with body and end electrodes, where the end electrodes have unparallel side edges and a minimum distance between them is greater than or equal to a preset pitch, and optionally features axisymmetric end electrodes and a second connection electrode to reduce overall resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional FFS-type display device uses parallel side edges configuration, then manufacturing is simple, but trace mura occurs due to non-uniform electric field distribution
Solution Approach 1:
The patent applies asymmetry by configuring the side edges of adjacent display electrodes to be unparallel rather than parallel. Specifically, the first side edge of a first display electrode and the first side edge of a second display electrode are unparallel, creating an asymmetric electric field distribution that eliminates the trace mura problem while maintaining manufacturing feasibility through standard photolithography processes.
2Area of stationary object
If end electrodes are positioned close together, then device area is reduced, but liquid crystal molecule deflection uniformity deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the end electrodes by configuring unparallel side edges with specific pitch relationships. The minimum distance between unparallel side edges is controlled to be greater than or equal to a preset pitch, which optimizes the electric field distribution and ensures uniform liquid crystal molecule deflection while minimizing the device area.
3Reliability
If connection electrodes are added to reduce resistance, then electrical conductivity improves, but device complexity increases
Solution Approach 1:
The patent merges the connection electrode function into the existing electrode structure by extending the display electrode to serve as a connection electrode. This integration approach reduces overall device resistance and improves electrical conductivity while avoiding the additional complexity that would result from separate connection electrodes.
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 improves the uniformity of liquid crystal molecule deflection, reduces trace mura by ensuring consistent deflection directions, and enhances the restoration time of liquid crystal molecules after pressure is applied.
Implementation Method 1
conventional fringe field switching (FFS) type display devices suffer from obvious trace mura issues due to non-uniform electric field distribution and liquid crystal molecule deflection
Data Source
AI summary
An electrode for display includes at least two display electrodes arranged at intervals along first direction, each including a body electrode and an end electrode; the at least two display electrodes include first and second display electrodes, body electrodes of the first and second display electrodes being parallel in first direction with a first preset pitch; among two side edges of the end electrode of the first display electrode opposite in first direction and two side edges of the end electrode of the second display electrode opposite in first direction, at least two side edges are unparallel; a minimum distance in first direction between one side edge of the end electrode of the first display electrode close to the second display electrode and one side edge of the end electrode of the second display electrode close to the first display electrode is greater than or equal to first preset pitch.