Liquid Crystal Display Panel Dummy Circuit for Mura Prevention
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Solution Overview
Problem
The existing methods for manufacturing liquid crystal display panels face challenges in achieving uniform alignment film thickness due to non-uniform rubbing forces, leading to the occurrence of mura (non-uniformity) in the display.
Innovation Solution
The solution involves dividing the substrate surface into a display region and a wiring region, where thin film transistor arrays and circuits are formed on the display region, and supporting structures are formed on the wiring region adjacent to the display region. These supporting structures, often in the form of dummy circuits or patterns, help maintain a uniform rubbing force by minimizing height differences, thereby preventing mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rubbing process is used to align liquid crystals, then alignment is achieved, but non-uniform rubbing force causes non-uniform alignment film thickness
Solution Approach 1:
The patent introduces a pre-rubbing process before the main rubbing operation. This preliminary action prepares the alignment film surface and ensures uniform thickness distribution before the primary rubbing force is applied, thereby preventing non-uniformity caused by direct rubbing on uneven surfaces
Solution Approach 2:
The patent uses a rubbing auxiliary layer as an intermediary between the rubbing cloth and the alignment film. This intermediate layer distributes the rubbing force more uniformly across the substrate surface, preventing direct concentration of force that causes thickness non-uniformity
2Area of stationary object
If alignment film is applied over the entire substrate including wiring region, then complete coverage is achieved, but height difference causes non-uniform rubbing force
Solution Approach 1:
The patent applies different rubbing treatments to different regions of the substrate. The display region receives full rubbing treatment while the wiring region receives modified or reduced rubbing, accounting for the height differences and ensuring uniform alignment film thickness in the critical display area without being adversely affected by wiring region variations
Data Source
AI summary
A liquid crystal display panel includes a substrate, a thin film transistor array, a circuit, and a dummy circuit. One surface of the substrate is divided into a display region and a wiring region. The thin film transistor array is formed on the display region. The circuit and the dummy circuit are formed on the wiring region, the dummy circuit is adjacent to the circuit, and the circuit and the dummy circuit protrude from the substrate.