LCD Pixel Electrode Dense Sparse Areas
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Solution Overview
Problem
Twisted nematic LCD devices suffer from narrow viewing angles and gray-level inversion at inclined viewing angles, which complicates the display process and affects image presentation.
Innovation Solution
An LCD device with a pixel electrode comprising at least one dense electrode area and one sparse electrode area, where the LC layer is doped with chiral dopants and optimized Δnd and d/p parameters, ensuring continuous-domain alignment and minimal transmittance inversion at any viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If twisted vertical alignment mode is used to achieve high transmittance and wide viewing angle, then transmittance and viewing angle are improved, but gray-level inversion occurs at inclined viewing angles
Solution Approach 1:
The pixel electrode is divided into multiple electrode areas with different electrode materials or structures, creating distinct alignment domains within the same pixel. Each domain produces complementary V-T curves that cancel out gray-level inversion effects when viewed from inclined angles
Solution Approach 2:
Different regions of the pixel electrode are assigned different local properties (different electrode materials, patterns, or structures) to create specific alignment characteristics in each region. This local differentiation enables complementary V-T curves while maintaining overall high transmittance and wide viewing angle performance
2Reliability
If multiple alignment domains are formed by dividing pixel into multiple display areas with different voltages, then gray-level inversion is eliminated, but device complexity increases
Solution Approach 1:
Multiple electrode areas with different alignment characteristics are merged into a single pixel electrode structure that is driven by a single voltage signal. This integration eliminates the need for separate voltage control circuits for each domain while still achieving complementary V-T curves through the electrode structure design
Solution Approach 2:
The pixel electrode structure is designed to perform multiple functions simultaneously: it creates different alignment domains for gray-level inversion elimination, maintains high transmittance, and achieves wide viewing angle, all while being controlled by a single voltage signal rather than requiring separate control mechanisms
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 solution achieves high transmittance and wide-view-angle characteristics without gray-level inversion, enhancing image presentation by modulating transmittance through varying electrode densities and areas, thus eliminating the inversion issue at inclined viewing angles.
Implementation Method 1
liquid crystal (LC) molecules present different light polarization or refraction effects under different alignments
Implementation Method 2
the LC layer is doped with chiral dopants and optimized Δnd and d/p parameters, ensuring continuous-domain alignment
Data Source
AI summary
A new type of liquid crystal display (LCD) device with improved high transmittance and wide-view-angle characteristics while without gray-level inversion at an inclined viewing angle is provided. The LCD device includes a first substrate with common electrodes, a second substrate with at least one pixel unit, a liquid crystal (LC) layer disposed between the first substrate and the second substrate, a first polarizer, and a second polarizer. The pixel unit has a pixel electrode, which is formed by at least one dense electrode area and at least one sparse electrode area. The LC molecules of the LC layer form a continuous-domain alignment after being driven by a voltage.