IPS Liquid Crystal Display Varying Width Electrodes
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Solution Overview
Problem
IPS-mode liquid crystal display devices have longer response times compared to VA-mode devices, which limits the performance of moving image display, particularly in liquid crystal televisions, due to lower response characteristics and slower transmittance changes from high to low states.
Innovation Solution
The design includes a liquid crystal display panel with a pair of substrates sandwiching a liquid crystal material and featuring a flat-shaped common electrode and a pixel electrode with comb-like sections aligned orthogonally, where the width or position of the comb-like electrode sections is varied to induce splay or bend deformations in liquid crystal molecules, increasing elastic energy and reducing response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If IPS-mode liquid crystal display device uses conventional electrode layout, then viewing angle is wide, but response time is long
Solution Approach 1:
The pixel electrode is divided into multiple comb-like electrode sections with varying widths, creating multiple protruding portions that generate splay or bend deformations in liquid crystal molecules. This segmentation allows the device to maintain wide viewing angles while reducing response time through enhanced elastic energy.
Solution Approach 2:
The comb-like electrode sections have different widths at different positions, creating local variations in electric field distribution. This local quality variation induces splay or bend deformations in specific regions, increasing elastic energy and reducing response time while preserving the overall IPS-mode wide viewing angle characteristic.
2Loss of time
If liquid crystal material viscosity is reduced, then response time is shortened, but performance improvement is limited
Solution Approach 1:
The electrode structure is designed in advance with varying width comb-like sections to pre-establish splay or bend deformation zones. This preliminary structural configuration ensures that elastic energy is maximized before operation, achieving significant response time reduction without relying solely on material viscosity reduction.
3Loss of time
If cell gap is narrowed, then response time is reduced, but manufacturing complexity increases
Solution Approach 1:
The electrode structure incorporates dynamic width variations in comb-like sections, allowing the electric field distribution to adapt and create splay or bend deformations. This dynamic structural design achieves response time reduction through elastic energy enhancement without requiring precise cell gap control, thereby avoiding increased manufacturing complexity.
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 shortens the response time and enhances the performance of moving image display by increasing the elastic energy associated with liquid crystal orientation changes, allowing for faster transmittance changes and improved display performance compared to previous IPS-mode devices.
Implementation Method 1
The electric field is the one to be generated by a potential difference between the pixel and common electrodes
Implementation Method 2
a liquid crystal material with a positive dielectric anisotropy
Data Source
AI summary
A liquid crystal display device that includes: a liquid crystal display panel configured by a pair of substrates sandwiching therebetween a liquid crystal material with a positive dielectric anisotropy; and a flat-shaped common electrode and a pixel electrode disposed on one of the pair of substrates with an overlay, via an insulator layer, between the common electrode and the pixel electrode when viewed from above. In the liquid crystal display device, the pixel electrode is extended in a first direction, and includes a plurality of comb-like electrode sections aligned in a second direction orthogonal to the first direction, and the comb-like electrode sections of the pixel electrode are varied in width in the second direction for a plurality of times at intervals shorter than a side extending in the first direction.