Liquid Crystal Display Divided Common Electrodes Reduce Color Wash-Out
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Solution Overview
Problem
Liquid crystal display apparatuses face challenges with light leakage and color wash-out phenomena due to high electrical resistance in common electrodes, leading to degraded picture quality and ambient contrast ratio.
Innovation Solution
The apparatus features a novel configuration with divided common electrodes and overlapping common electrode lines, an auxiliary common electrode, and a color wash-out reducing layer, which reduces parasitic capacitance and enhances electric field control to minimize light leakage and color wash-out, while improving ambient contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the common electrode is divided into multiple regions with multiple common electrode lines, then voltage control capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The common electrode is divided into multiple divided common electrodes (first, second, third, fourth divided common electrodes) arranged in a matrix pattern, with corresponding common electrode lines (first, second, third, fourth common electrode lines) controlling each region independently, enabling localized voltage control
2Object-affected harmful factors
If common electrode lines and data lines are arranged to overlap at opening portions, then light leakage is reduced, but parasitic capacitance increases
Solution Approach 1:
An insulating layer is introduced as an intermediary between the common electrode lines and data lines at the opening portions where they overlap, preventing direct electrical contact and reducing parasitic capacitance while maintaining the light-blocking function
Solution Approach 2:
The insulating layer is selectively applied only at the opening portions where common electrode lines and data lines overlap, providing localized capacitance reduction without affecting other areas of the display structure
3Object-affected harmful factors
If the width of common electrode lines is increased, then color wash-out phenomenon is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The width of common electrode lines is specifically increased to be greater than the width of data lines, creating a geometric parameter change that physically blocks light leakage paths and reduces color wash-out between adjacent sub-pixels
Data Source
AI summary
Provided is a liquid crystal display apparatus. The liquid crystal display apparatus comprises a plurality of common electrode lines on a first substrate, a first planarization layer on the plurality of common electrode lines, a plurality of data lines on the first planarization layer, a second planarization layer on the plurality of data lines, and a plurality of divided common electrodes on the second planarization layer, wherein an opening portion is between the plurality of divided common electrodes, wherein the common electrode lines and the data lines overlap each other at the opening portion, and wherein a width of the common electrode lines is larger than a width of the data lines for reducing a degree of color wash-out phenomenon of neighboring sub-pixels adjacent to the opening portion.