Liquid Crystal Display Repair Pattern and Common Voltage Line
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Solution Overview
Problem
Liquid crystal displays face challenges with low side visibility and high manufacturing costs due to the number of data lines and signal delay in the driver, which affects aperture ratio and overall cost efficiency.
Innovation Solution
The design incorporates a repair pattern on the insulation substrate that overlaps with pixel and common electrodes, reducing the number of data lines and signal delay, and includes a common voltage line that extends between neighboring data lines, effectively reducing manufacturing costs by minimizing the number of data lines and maintaining aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the number of data lines is increased to improve pixel control, then the driver cost increases, but the aperture ratio deteriorates
Solution Approach 1:
The common voltage line is designed to serve multiple functions: it provides common voltage to pixel electrodes and simultaneously acts as a repair pattern for bad pixels. This multi-functionality reduces the need for separate repair lines and maintains aperture ratio while enabling comprehensive pixel control.
Solution Approach 2:
Repair patterns are selectively formed only in specific regions where bad pixels are located, rather than uniformly across the entire display. This localized approach minimizes the impact on aperture ratio while providing targeted repair capability for defective pixels.
2Reliability
If repair patterns are formed to repair bad pixels, then the aperture ratio deteriorates, but pixel reliability improves
Solution Approach 1:
The common voltage line performs dual functions as both a voltage supply line and a repair pattern. By integrating these functions into a single structure, the patent avoids the need for separate repair patterns that would reduce aperture ratio, while still providing comprehensive repair capability for bad pixels.
Solution Approach 2:
The common voltage line automatically serves as a repair pattern for bad pixels without requiring additional dedicated repair structures. The system uses its own existing infrastructure (the common voltage line) to provide repair functionality, eliminating the need for separate repair elements that would compromise aperture ratio.
3Loss of time
If the common voltage line length is reduced to decrease signal delay, then the driver cost reduces, but voltage distribution uniformity worsens
Solution Approach 1:
The common voltage line is divided into multiple segments that are distributed across the display panel. Each segment serves a local region, reducing the length of individual voltage transmission paths and minimizing signal delay, while the overall distribution maintains voltage uniformity across the entire display.
Solution Approach 2:
The common voltage line is arranged in a two-dimensional network pattern rather than a single long linear path. This dimensional transformation creates multiple shorter transmission paths that reduce signal delay while maintaining uniform voltage distribution through the distributed network structure.
Data Source
AI summary
A liquid crystal display includes an insulation substrate, a gate line and a data line disposed on the insulation substrate, a repair pattern disposed on the insulation substrate, a first passivation layer disposed on the gate line, the data line and the repair pattern and a pixel electrode and a common electrode that is disposed on the first passivation layer and that overlap each other, and a second passivation layer disposed between the pixel electrode and the common electrode where the repair pattern overlaps the pixel electrode.