Patterned Conductive Layers for Touch-Sensing Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch panels face challenges in reducing the thickness of the conductive layer without significantly increasing sheet resistance, which affects transmittance and touch-sensing characteristics.
Innovation Solution
The use of patterned conductive layers in a touch-sensing substrate, arranged between display regions, reduces sheet resistance and improves transmittance by being electrically connected to sensing pads and bridging lines, allowing for better touch-sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the thickness of the transparent conductive layer is reduced to increase transmittance, then the transmittance of the touch panel is improved, but the sheet resistance of the conductive film layer increases and sensing signal strength decreases
Solution Approach 1:
The conductive layer is divided into multiple patterned conductive layers (first patterned conductive layer and second patterned conductive layer) with different transparency and resistance characteristics. The first patterned conductive layer has higher transparency and is positioned closer to the display, while the second patterned conductive layer has higher conductivity and compensates for the increased sheet resistance, thereby resolving the contradiction between transmittance and sensing signal strength.
2Length of moving object
If the thickness of the conductive layer is reduced to meet thin and light weight product trends, then the overall thickness is reduced, but the sheet resistance increases significantly
Solution Approach 1:
The patent employs a composite structure consisting of multiple patterned conductive layers with different material compositions and thicknesses. The first patterned conductive layer uses a transparent conductive material optimized for light transmission, while the second patterned conductive layer uses a material with superior electrical conductivity, creating a composite system that achieves both thinness and low sheet resistance.
3Device complexity
If a single side design integrating color filter layer and touch-sensing unit is used, then the structure is simplified, but the fabrication becomes complicated and resolution decreases
Solution Approach 1:
The patent resolves the single side design limitations by utilizing the vertical dimension (z-axis) to stack multiple patterned conductive layers at different positions relative to the color filter layer and display regions. This three-dimensional arrangement allows for simplified single-side integration while maintaining high resolution through precise vertical positioning and patterned configurations.
Data Source
AI summary
A color filter substrate including a substrate, a plurality of patterned color filter layers, and a plurality of sensing serials is provided. The substrate has a first surface and a second surface opposite to the first surface. The substrate includes a plurality of display regions arranged in array and a separated region located between the display regions. The patterned color filter layers are arranged in array on the first surface and corresponding to the display regions. The sensing serials are arranged on the second surface and insulated from each other. Each sensing serial includes a plurality of sensing pads; a plurality of bridging lines, each connected with two adjacent sensing pads; a plurality of patterned conductive layers stacked and electrically connected with the sensing pads. The position of the patterned conductive layers is corresponding to the separated region. A touch-sensing liquid crystal display and a touch-sensing substrate are also provided.