Touch Sensing Color Filter With Stacked Electrodes
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Solution Overview
Problem
Conventional single-side touch sensing color filters have complex fabrication processes and limited resolution due to the need for additional photo-mask processes and the arrangement of X and Y electrodes on the same plane, which restricts the improvement of touch sensing resolution.
Innovation Solution
A touch sensing color filter design that includes a substrate with a black matrix and a second sensing electrode layer, where the second sensing electrode layer is formed with sub-patterns corresponding to sub-pixel areas, and a dielectric layer is used to cover the black matrix and the color filter units, simplifying the fabrication process and improving resolution by allowing for separate formation of X and Y electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional single-side touch sensing color filter uses X and Y electrodes arranged on the same plane, then the fabrication process can be simplified, but the touch sensing resolution is limited
Solution Approach 1:
The patent transitions from a single-plane electrode arrangement to a multi-layer structure where X electrodes and Y electrodes are positioned on different planes separated by a dielectric layer. This dimensional change allows both electrodes to be formed without requiring complex photo-mask processes while enabling higher touch sensing resolution through improved electrode positioning and reduced interference.
2Ease of manufacture
If through holes are formed in the first dielectric layer using an additional photo-mask process, then the electrode connections can be achieved, but the fabrication process becomes more complicated and process yield cannot be assured
Solution Approach 1:
The patent extracts and eliminates the additional photo-mask process step from the fabrication sequence. Instead of forming through holes in the first dielectric layer, the design positions X and Y electrodes on different planes with the dielectric layer serving as both insulation and structural support, thereby removing the complex photo-mask process while maintaining electrical connectivity.
3Manufacturing precision
If the black matrix is disposed on the substrate to define sub-pixel areas, then the color filter structure is established, but the touch sensing resolution is limited by the single-side electrode arrangement
Solution Approach 1:
The patent resolves the resolution limitation by stacking electrode layers in the vertical dimension. The X electrodes are disposed on the substrate plane while Y electrodes are positioned on a second plane above the dielectric layer, creating a three-dimensional electrode configuration that enhances touch sensing resolution without complicating the overall device structure.
Data Source
AI summary
A touch sensing color filter including a substrate, a black matrix, a color filter layer and a second sensing electrode layer is provided. The black matrix is disposed on the substrate to define a plurality of sub-pixel areas. The black matrix includes a first sensing electrode layer, and the first sensing electrode layer has a plurality of openings corresponding to the sub-pixel areas. The color filter layer includes a plurality of color filter units disposed in the sub-pixel areas respectively. The second sensing electrode layer is disposed on the substrate, and the second sensing electrode layer includes a plurality of sub patterns corresponding to the sub-pixel areas. A method for fabricating the touch sensing color filter and a display panel using the same are further provided.