IPS Array Substrate End Electrode Angle Optimization
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Solution Overview
Problem
In-Plane Switching display panels experience nonuniform display and trace Mura due to disordered liquid crystal molecule arrangements at the edge positions, leading to decreased light transmittance and luminance, caused by external forces and slide operations.
Innovation Solution
The design of an array substrate with pixel units featuring a first electrode and a second electrode, where the end electrode forms an angle between 30° and 40° with the alignment direction, reducing the area of black disclination lines and decreasing the intensity of undesired electric fields, thereby improving light transmittance and alleviating nonuniform display issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the common electrode uses strip branch electrodes with end electrodes, then the pixel unit can generate electric fields to control liquid crystal molecules, but the liquid crystal molecules at edge positions become disordered forming black disclination lines
Solution Approach 1:
The patent changes the geometric parameters of the end electrode by setting specific angles (30-60 degrees) between the end electrode and the alignment direction, or between adjacent branch electrodes. This parameter optimization prevents the formation of strong undesired electric fields that cause liquid crystal molecule disorder, thereby eliminating black disclination lines while maintaining display uniformity.
2Adaptability or versatility
If external force is applied to the display panel surface, then slide operations can be performed, but the liquid crystal molecule arrangement becomes more disordered increasing black disclination line regions
Solution Approach 1:
The patent designs the end electrode with specific angular parameters (30-60 degrees) beforehand to create a more stable electric field distribution. This pre-optimized structure acts as a cushion against external disturbances, making the liquid crystal molecule arrangement more resistant to disordering during slide operations, thus preventing increase of black disclination line regions.
3Device complexity
If the end electrode is positioned at standard angles, then the pixel unit structure is simple, but light transmittance and luminance decrease due to black disclination lines
Solution Approach 1:
The patent optimizes the angular parameters of the end electrode within specific ranges (30-60 degrees) to achieve the best balance between structural simplicity and optical performance. This parameter optimization eliminates black disclination lines that block light, thereby maximizing light transmittance and luminance without complicating the electrode structure.
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 effectively reduces the area of black disclination lines, enhances light transmittance, and quickly recovers from external forces, improving the display's uniformity and Mura recovery time without sacrificing display quality.
Implementation Method 1
an alignment layer covering the pixel units and having an alignment direction parallel to a plane of the array substrate
Implementation Method 2
a planar electric field is generated between electrodes of pixels in the same plane so that alignment liquid crystal molecules between the electrodes and those right over the electrodes can be rotated to a direction parallel to the plane of the substrate
Data Source
AI summary
An array substrate, a display panel and a display device. The array substrate includes: a plurality of pixel units; an alignment layer covering the pixel units and having an alignment direction parallel to a plane of the array substrate; and a first electrode and a second electrode both disposed within each of the pixel units; where, the first electrode has at least one branch electrode, the branch electrode has a median electrode and an end electrode disposed at at least one end of the median electrode, an angle formed between the end electrode and the alignment direction is different from that formed between the median electrode and the alignment direction, and the angle formed between the end electrode and the alignment direction is larger than or equal to 30° and smaller than or equal to 40°.