Array Substrate Black Light-Shading Layer for LCD Light Leakage
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Solution Overview
Problem
In the production of color on TFT (COT) type LCD devices, relative position shifts between the black matrix on the counter substrate and the data line can cause light leakage, reducing product yield, and increasing the width of the black matrix to prevent this affects transmittance negatively.
Innovation Solution
The array substrate design includes a black light-shading layer between the substrate and the first metal layer, with a shielding metal and data line configuration that maintains a gap perpendicular to the data line, using a black photoresist containing carbon black to suppress light leakage, and a manufacturing method that forms these layers using a shared masking process to simplify complexity and ensure transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the width of the black matrix on the counter substrate is increased to prevent light leakage, then light leakage is suppressed, but the transmittance of the product is reduced
Solution Approach 1:
The patent introduces a black light-shading layer on the array substrate to block light leakage paths that occur in the gap between the black matrix and data line, adding a new dimensional solution rather than simply widening the existing black matrix structure
Solution Approach 2:
The black light-shading layer acts as an intermediary element positioned between the substrate and the first metal layer to intercept and block stray light, preventing it from reaching the data line and causing leakage without requiring the black matrix to be wider
2Object-affected harmful factors
If the relative position alignment between the black matrix on the counter substrate and the data line is improved, then light leakage is prevented, but the manufacturing complexity and alignment precision requirements increase
Solution Approach 1:
The black light-shading layer is formed in advance during the array substrate manufacturing process, creating a preliminary light-blocking structure that compensates for potential misalignment issues before the final assembly occurs
Solution Approach 2:
The black light-shading layer serves as a mediator that decouples the alignment requirements between the black matrix and data line, allowing independent formation of each component while the shading layer ensures light leakage prevention regardless of relative positioning
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
Effectively prevents light leakage between the data line and shielding metal, maintaining product transmittance while addressing misalignment issues between substrates during assembly.
Implementation Method 1
a black light-shading layer, disposed on the substrate... a material of the black light-shading layer is a black photoresist containing carbon black
Data Source
AI summary
An array substrate includes: a substrate; a black light-shading layer disposed on the substrate; a first metal layer correspondingly disposed on the black light-shading layer and thereby the black light-shading layer being located between the substrate and the first metal layer; an active material layer disposed on the first metal layer; a second metal layer disposed on the active material layer; a passivation layer disposed on the second metal layer and with a contact hole; a color filter layer disposed on the passivation layer; and a pixel electrode layer disposed on the color filter layer and connected to the second metal layer through the contact hole. Moreover, a liquid crystal display panel and a manufacturing method of an array substrate also are provided.