Color Filter Substrate with Integrated Touch Sensing Light Shield
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Solution Overview
Problem
The manufacturing process of touch screen LCD displays is complex and costly due to the need for multiple layers, including a black matrix that affects surface flatness and requires a planarization layer, making it difficult to produce thin and lightweight devices.
Innovation Solution
A color filter substrate with a sensing layer comprising a first and second metal layer and an insulating layer, where at least one of these layers is made of light shielding material, forming a grid to shield sub-pixel boundaries and replace the black matrix, allowing direct application of color paste and eliminating the need for a planarization layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a black matrix is produced on the substrate to prevent color blending, then color separation is improved, but surface flatness deteriorates and requires additional planarization layers
Solution Approach 1:
The sensing layer is merged with the light shielding function by making at least one of the metal layers or insulating layer composed of light shielding material, causing the sensing layer to simultaneously serve as both the capacitive sensing structure and the black matrix equivalent, eliminating the need for separate black matrix and planarization layers
Solution Approach 2:
The sensing layer is designed to perform multiple functions: capacitive sensing (through the metal layers and insulating layer structure) and light shielding (through the light shielding material composition), thereby serving as a universal layer that replaces both the traditional black matrix and planarization layer
2Manufacturing precision
If multiple layers including black matrix and planarization layer are produced, then color filtering precision is improved, but device thickness and weight increase
Solution Approach 1:
Multiple layers are merged into a single integrated sensing layer structure where the first metal layer, second metal layer, and insulating layer work together to provide both sensing capability and light shielding, eliminating the need for separate black matrix and planarization layers
Solution Approach 2:
The sensing layer is designed as a multi-functional component that simultaneously provides capacitive sensing functionality and optical shielding functionality, replacing multiple traditional layers with a single integrated structure that maintains color filtering precision while reducing overall device weight
3Manufacturing precision
If multiple layers including black matrix and planarization layer are produced, then color filtering precision is improved, but device thickness increases
Solution Approach 1:
The sensing layer combines the functions of black matrix and planarization layer into a single integrated structure, eliminating the need for multiple separate layers and thereby reducing the overall thickness of the color filter substrate while maintaining color filtering precision
Solution Approach 2:
The sensing layer serves as a universal replacement for both black matrix and planarization layer, providing simultaneous light shielding and surface planarization functions in a single layer configuration, which reduces device thickness while maintaining manufacturing precision
4Reliability
If a conventional sensing layer with transparent conductive film and insulating film is used, then capacitive sensing is achieved, but the number of layers increases and production complexity increases
Solution Approach 1:
The sensing layer merges the capacitive sensing structure with the light shielding function by using light shielding material for at least one of the metal layers or insulating layer, causing this single layer to simultaneously provide sensing capability and replace the traditional black matrix, thereby reducing the total number of layers
Solution Approach 2:
The sensing layer is designed as a multi-functional component that provides both capacitive sensing (through the metal layers and insulating layer configuration) and optical shielding (through light shielding material), serving as a universal replacement for multiple traditional layers and simplifying the overall production process
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
This solution reduces the number of layers, optimizes production, lowers costs, and results in thinner and lighter touch screen devices by integrating the sensing layer as a light shield, eliminating the need for a black matrix and planarization layer.
Implementation Method 1
At least one of the first metal layer, the second metal layer and the insulating layer is made of a light shielding material, the light shielding material is projected on the color filter film as a grid and shields the boundaries between respective sub-pixel regions
Data Source
AI summary
The present disclosure relates to a color filter and a capacitive touch screen. Said color filter comprises a substrate; a color filter film formed on the substrate and comprising a plurality of sub-pixel regions; and a sensing layer formed on the substrate and comprising a first metal layer, a second metal layer and an insulting layer located between the first metal layer and the second metal layer. At least one of the first metal layer, the second metal layer and the insulating layer is made of a light shielding material, the light shielding material is projected on the color filter film as a grid and shields the boundaries between respective sub-pixel regions. According to the present disclosure, the number of layers produced is reduced, production process is optimized, and the cost is reduced and the color filter substrate is thinner and lighter compared with the conventional color filter substrate.