Liquid Crystal Display Counter Electrode Signal Delay Compensation
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Solution Overview
Problem
Active matrix liquid crystal display devices experience nonuniform display characteristics due to signal delay in scanning signal wirings, leading to flickers and uneven voltage distribution across the display surface, which is exacerbated by varying resistance and capacitance in the wiring.
Innovation Solution
The liquid crystal display device incorporates a counter electrode configuration with multiple counter electrode lines, each with a unique potential distribution that matches the optimum common potential (Vcom) in both vertical and horizontal directions, achieved by adjusting the resistance values of resistors on the counter electrode lines based on the length of the routing wirings, ensuring uniform potential distribution across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common potential is applied to the entire counter electrode, then the structure is simple, but signal delay causes nonuniform voltage distribution and display characteristics across the display surface
Solution Approach 1:
The counter electrode is divided into multiple independent counter electrode lines (first, second, third, and fourth lines) that can be independently controlled. Each line serves a specific scanning signal wiring group, allowing independent potential adjustment to compensate for signal delay variations across different regions of the display surface.
Solution Approach 2:
Different potential values are applied to different counter electrode lines based on their specific signal delay characteristics. The first and second counter electrode lines receive a first potential, while the third and fourth lines receive a second potential, creating local potential variations that match the local signal delay patterns in different display regions.
2Ease of operation
If routing wirings are made longer to connect mounting terminals, then connectivity is achieved, but resistance increases causing greater signal delay and potential distribution variation
Solution Approach 1:
The potential distribution on the counter electrode lines is adjusted in advance to compensate for the signal delay caused by long routing wirings. By pre-setting appropriate potential values on different counter electrode lines, the invention counteracts the delay effects before they manifest in the display characteristics.
3Reliability
If scanning signal wirings are extended across the display area, then all pixels are connected, but resistance and capacitance cause varying signal delay for each pixel electrode
Solution Approach 1:
The scanning signal wirings are grouped into different sets (first scanning signal wirings and second scanning signal wirings), with each set associated with specific counter electrode lines. This segmentation allows independent potential control for different wiring groups, compensating for the varying signal delay characteristics of each group.
Data Source
AI summary
A liquid crystal display device according to the present invention is a liquid crystal display device in which liquid crystals are sealed between a TFT array substrate, and a counter substrate formed with a counter electrode. A plurality of scanning signal wirings and a plurality of image signal wirings are formed in a matrix on the TFT array substrate. The counter electrode is configured from a plurality of counter electrode lines. Each of the plurality of counter electrode lines is provided along a corresponding one of the plurality of scanning signal wirings or a corresponding one of the plurality of image signal wirings in plan view. Each of the plurality of counter electrode lines has a potential distribution in an extending direction. The respective potential distributions for the plurality of counter electrode lines are different.