Wall Electrode IPS LCD Stabilizing Domain Boundary
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-definition liquid crystal display devices with wall electrodes, the multi-domain structure experiences instability at the domain boundary, leading to short-time image lag and brightness unevenness due to the distribution of the electric field, which differs from that in traditional IPS-LCDs, making it challenging to achieve stable domain boundaries and effective viewing angle characteristics.
Innovation Solution
A pixel structure is designed where the shortest portion between the common electrode and source electrode is localized at a single location near the bend portion, with a parallel portion and a projection opposing each other, stabilizing the domain boundary by minimizing the domain boundary length and distributing the electric field uniformly across the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a multi-domain structure is adopted to improve viewing angle characteristics, then viewing angle characteristics are improved, but domain boundary instability occurs leading to short-time image lag and brightness unevenness
Solution Approach 1:
The patent applies different structural characteristics to different regions of the wall electrode. Specifically, the wall electrode has a bent portion with a specific curvature radius that creates a localized region with different electric field distribution compared to other areas. This local structural variation stabilizes the domain boundary at critical locations while maintaining the overall multi-domain structure for viewing angle improvement.
Solution Approach 2:
The wall electrode structure is pre-designed with bent portions having specific curvature radii before the device operates. This preliminary structural configuration ensures that the electric field distribution is optimized in advance to prevent domain boundary instability, rather than attempting to correct it during operation.
2Stability of the object's composition
If the spacing between common electrode and source electrode is increased to distribute electric field widely, then electric field distribution is improved, but field strength becomes weak reducing transmission efficiency
Solution Approach 1:
The patent transitions from a one-dimensional spacing adjustment to a two-dimensional structural solution by introducing bent portions with specific curvature radii. This dimensional change allows the electric field to be distributed more effectively across the liquid crystal layer while maintaining adequate field strength through the geometric configuration of the bent portions.
Solution Approach 2:
The patent optimizes the curvature radius of the bent portions as a critical parameter. By carefully selecting the curvature radius within a specific range, the electric field distribution and field strength are simultaneously optimized, resolving the contradiction between wide distribution and sufficient intensity.
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 reduces short-time image lag and brightness unevenness, enhancing the stability of the domain boundary and maintaining high transmission, making the wall electrode IPS-LCD suitable for use in touch panels and improving viewing angle characteristics.
Implementation Method 1
applies an electric field to a liquid crystal layer by use of electrodes formed on wall surfaces of wall structures projecting in the liquid crystal layer
Implementation Method 2
operates liquid crystal molecules by use of a parallel electric field
Data Source
AI summary
A wall electrode IPS mode LCD has stabilized domain boundary. Signal and scanning lines extend in first and second directions, respectively, surrounding a pixel. A first wall structure has a first portion intersecting the first direction at a first angle, a second portion in the first direction, and a third portion intersecting the first direction at a second angle. The second portion has a first projection in the second direction. The second wall structure has a fourth portion intersecting the first direction at the first angle, a fifth portion in the first direction, and a sixth portion intersecting the first direction at the second angle. The fifth portion has a second projection in the second direction. A distance between the first projection and the fifth portion is shorter than a distance between the first wall structure except the first projection and the second wall structure.