Liquid Crystal Display Electrode Segmentation for Uniform Field
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Solution Overview
Problem
The fine slit structure in liquid crystal display devices with small lines and spaces leads to non-uniform light transmittance due to incomplete electric field application, and lateral electric field driving types face issues with non-uniformity in electric field profiles, causing orientation disorder and reduced light transmittance.
Innovation Solution
A liquid crystal display device configuration with a first substrate and a second substrate, where the first electrode includes a base layer with recesses and protrusions, and transparent conductive material layers are formed on the protrusions and recesses, respectively, and a high dielectric material layer is used to ensure uniform electric field profiles and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fine slit structure with small lines and spaces is used to control liquid crystal orientation, then viewing angle is improved, but light transmittance becomes non-uniform due to incomplete electric field application
Solution Approach 1:
The first electrode is divided into multiple independent transparent conductive material layers (first, second, third layers) that can be separately formed and controlled. This segmentation allows each layer to contribute to the electric field distribution, ensuring complete and uniform electric field application across the liquid crystal layer, thereby resolving the non-uniform light transmittance issue while maintaining the fine slit structure for wide viewing angle
Solution Approach 2:
The patent introduces a vertical stacking dimension by forming multiple transparent conductive material layers at different positions (first layer on first substrate, second layer on second substrate, third layer between substrates). This dimensional transformation converts a two-dimensional electrode pattern into a three-dimensional electric field distribution, achieving uniform field application that prevents non-uniform light transmittance while preserving the fine slit orientation control for wide viewing angle
2Speed
If lateral electric field driving type is used for voltage application, then response speed is improved, but non-uniformity in electric field profile causes orientation disorder
Solution Approach 1:
The patent creates equipotential surfaces by strategically positioning multiple transparent conductive material layers with appropriate potentials. The first layer on the first substrate, second layer on the second substrate, and third layer between substrates work together to establish uniform potential distribution, generating a uniform lateral electric field that maintains stable liquid crystal orientation while achieving fast response through lateral field driving
Solution Approach 2:
The third transparent conductive material layer positioned between the first and second substrates acts as an intermediary element that mediates the electric field distribution. This intermediate layer helps balance the electric field profile, preventing orientation disorder while maintaining the fast response characteristics of lateral electric field driving
3Stability of the object's composition
If transparent conductive material layers are formed on protrusions and recesses of base layer, then electric field uniformity is improved, but device complexity increases
Solution Approach 1:
The patent combines the base layer with transparent conductive material layers to form an integrated electrode structure. The first transparent conductive material layer is formed on protrusions of the base layer, the second layer on recesses, and the third layer bridges them, merging multiple functional elements into a unified electrode system that achieves electric field uniformity without requiring separate complex components
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
The configuration enhances the uniformity of the electric field and light transmittance by orienting liquid crystal molecules uniformly, improving response characteristics and reducing dark lines, while also reducing costs and power consumption.
Implementation Method 1
a high dielectric material layer is used to ensure uniform electric field profiles
Implementation Method 2
a high dielectric material layer is used to ensure uniform electric field profiles
Implementation Method 3
a liquid crystal molecule has a feature of positive dielectric anisotropy, i.e., a feature that a dielectric constant of liquid crystal molecules in the major axis direction is larger than in the minor axis direction
Implementation Method 4
liquid crystal molecules oriented in the direction perpendicular to the substrate are responded in a manner falling in directions parallel with the substrate on the basis of negative dielectric anisotropy when voltage is applied
Data Source
AI summary
A liquid crystal display device includes a plurality of arranged pixels. Each of the pixels includes: a first substrate and a second substrate; a first electrode provided on a counter face of the first substrate, the counter face facing the second substrate; a second electrode provided on a counter face of the second substrate, the counter face facing the first substrate; and a liquid crystal layer that contains liquid crystal molecules, and is sandwiched between the first substrate and the second substrate. The liquid crystal molecules are given a pre-tilt. The first electrode includes a base layer 150 that contains a plurality of recesses and protrusions, and transparent conductive material layers 135 and 145. The first transparent conductive material layer 135 connected to a first power supply portion is formed on protrusion top faces 151 of the base layer 150. The second transparent conductive material layer 145 connected to a second power supply portion is formed on recess bottom faces 152 of the base layer 150. The first transparent conductive material layer 135 and the second transparent conductive material layer 145 are separated from each other.