Touch Sensor Black Matrix Curing for Transmittance
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Solution Overview
Problem
Current touch sensors for display devices face challenges in achieving high transmittance and optical properties while maintaining touch sensing sensitivity, often interfering with additional functional devices like cameras and speakers due to their design.
Innovation Solution
A touch sensor design featuring a substrate layer with sensing electrodes, an insulation layer, bridge electrodes, and a black matrix formed by curing a material at 170° C to 190° C, which includes carbon black, to improve transmittance and optical properties, and reduce damage from static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a touch sensor is applied to a display device, then touch sensing function is achieved, but image quality deteriorates due to sensing electrodes blocking light
Solution Approach 1:
The patent applies local quality by making the sensing electrodes transparent in the pixel aperture regions where light passes through, while maintaining conductive properties in non-aperture regions. This allows the electrodes to perform touch sensing function locally without blocking light in critical areas, thus resolving the contradiction between touch sensing reliability and image quality.
2Adaptability or versatility
If additional functional devices are coupled to the display device, then device functionality is improved, but touch sensor performance deteriorates due to interference
Solution Approach 1:
The patent segments the touch sensor structure into distinct functional layers including transparent sensing electrodes, insulation layers, and black matrix regions. This segmentation allows additional functional devices to be integrated in specific zones without interfering with the touch sensing electrodes, enabling both improved device functionality and maintained touch sensor performance.
3Illumination intensity
If transmittance of touch sensor is increased, then image quality improves, but touch sensing sensitivity deteriorates
Solution Approach 1:
The patent employs composite materials by combining transparent conductive oxide layers with metal layers in a multilayer sensing electrode structure. This composite approach maintains high transmittance through the transparent oxide while the metal layer provides sufficient electrical conductivity for touch sensing sensitivity, thus resolving the contradiction between transmittance and sensing precision.
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 design enhances the transmittance and optical properties of touch sensors, reducing damage from static electricity and improving touch sensing sensitivity while allowing for the integration of additional functional devices without compromising image quality.
Implementation Method 1
the black matrix is formed by curing a predetermined material at 170° C. to 190° C.
Data Source
AI summary
A touch sensor according to an embodiment of the present disclosure may include a substrate layer, sensing electrodes that are formed on the substrate layer, an insulation layer that is formed on the substrate layer to cover the sensing electrodes, and a black matrix that is formed on the insulation layer.