Color Filter Substrate Grain Compensation Layer
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Solution Overview
Problem
Liquid crystal display devices face issues with border stains due to moisture permeation, which are exacerbated by the small grain size of the conductive layer in the color filter substrate, leading to increased power consumption and reduced reliability.
Innovation Solution
Incorporating a grain compensation layer with zinc oxide and a first metal oxide, such as aluminum or gallium oxide, between the color layer and the conductive layer to increase the grain size of the conductive layer, thereby reducing moisture permeation and preventing border stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional conductive layer is formed directly on the color layer, then the manufacturing process is simple, but the grain size of the conductive layer is small leading to border stains
Solution Approach 1:
A grain compensation layer composed of zinc oxide and a first metal oxide is introduced between the color layer and the conductive layer. This intermediate layer serves as a buffer that increases the grain size of the conductive layer, thereby preventing moisture permeation and border stains while maintaining manufacturing feasibility.
Solution Approach 2:
The grain compensation layer is formed using a composite material system consisting of zinc oxide and a first metal oxide (such as gallium oxide, indium oxide, or tin oxide). This composite structure enables grain size control in the overlying conductive layer, resolving the contradiction between structural simplicity and border stain prevention.
2Reliability
If the grain size of the conductive layer is increased to prevent moisture permeation, then border stains are prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The grain compensation layer modifies the physical and chemical parameters of the interface between the color layer and conductive layer. By controlling the composition (zinc oxide and first metal oxide in specific ratios) and thickness (50-200 nm) of this layer, the grain size of the conductive layer is enhanced, improving moisture barrier performance without significantly complicating the manufacturing process.
3Reliability
If a grain compensation layer is added to increase conductive layer grain size, then border stains are prevented, but the number of layers increases
Solution Approach 1:
The grain compensation layer acts as a functional intermediary that performs multiple roles: it increases the grain size of the conductive layer, prevents moisture permeation, and maintains electrical conductivity. By consolidating these functions into a single thin layer, the patent minimizes the increase in overall structural complexity while achieving border stain prevention.
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
The increased grain size of the conductive layer effectively blocks moisture, preventing border stains and enhancing the reliability and power efficiency of the display device.
Implementation Method 1
a grain compensation layer which includes zinc oxide (ZnO) and a first metal oxide different from the zinc oxide... to increase a grain size of the conductive layer
Data Source
AI summary
A color filter substrate including a base substrate, a color layer on the base substrate, a conductive layer on the color layer, and a grain compensation layer between the color layer and the conductive layer. The grain compensation layer includes zinc oxide and a metal oxide other than zinc oxide. A content of the metal oxide is lower than that of the zinc oxide in the grain compensation layer. The grain compensation layer increases the grain size of the conductive layer.