Touch Display Panel Transparent Conductive Layer Static Discharge
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Solution Overview
Problem
Touch display panels suffer from poor blanking and static electricity issues due to the large difference in light transmittance and reflectivity between sensing and driving electrodes, and the inability to release static electricity effectively.
Innovation Solution
A touch display panel with a transparent electrically conductive layer between the color film substrate and the touch electrode layer, where the layer has varying thicknesses in different areas to reduce light transmittance and reflectivity differences and allow for static electricity discharge to ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensing electrode layer has a larger width to improve touch sensitivity, then the light transmittance and reflectivity in the sensing electrode area differ greatly from the driving electrode area, but this leads to poor blanking and visible electrode areas
Solution Approach 1:
The patent introduces a transparent electrically conductive layer with spatially varying thickness: a first thickness in the sensing electrode area and a second thickness in the driving electrode area. This local variation in thickness compensates for the optical property differences between the two electrode areas, enabling uniform light transmittance and reflectivity across the entire touch panel while maintaining the required touch sensitivity in the sensing area.
2Adaptability or versatility
If the touch electrode layer is placed on the color film substrate surface to enable touch functionality, then static electricity cannot be released, but this results in white display and complete visibility of the sensing and driving electrodes
Solution Approach 1:
The patent introduces a transparent electrically conductive layer as an intermediary between the color film substrate and the touch electrode layer. This intermediate layer serves dual purposes: it provides a grounding path to dissipate static electricity from the touch electrode layer, and it optically compensates for the differences in light transmittance and reflectivity between the sensing and driving electrode areas, thereby eliminating both static electricity issues and poor blanking.
3Illumination intensity
If a transparent electrically conductive layer with varying thickness is introduced to compensate for light transmittance differences, then the structural complexity increases, but this resolves the poor blanking issue
Solution Approach 1:
The transparent electrically conductive layer is designed to perform multiple functions simultaneously: (1) it provides optical compensation by having different thicknesses in different areas to equalize light transmittance and reflectivity, and (2) it provides electrical grounding to dissipate static electricity. By combining these two functions into a single layer, the patent avoids the need for separate compensation and grounding structures, thereby limiting the increase in device complexity while achieving both goals.
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 solution effectively reduces light transmittance and reflectivity differences between sensing and driving electrodes, improving touch quality by allowing static electricity to be released, thus mitigating poor blanking and enhancing touch performance.
Implementation Method 1
a thickness of the transparent electrically conductive layer located in the first area is greater than a thickness of the transparent electrically conductive layer located in the second area... the difference value between the thickness of the transparent electrically conductive layer located in the first area and a sum of a thickness of the touch electrode layer and the thickness of the transparent electrically conductive layer located in the second area is within a preset range
Implementation Method 2
the transparent electrically conductive layer is suitable for being electrically connected to ground... when static electricity is generated due to external factors, the generated static electricity may be introduced to ground terminal through the transparent electrically conductive layer, thereby being capable of releasing the static electricity effectively
Implementation Method 3
a transparent electrically conductive layer between the color film substrate and the touch electrode layer and insulated from the touch electrode layer
Data Source
AI summary
The touch display panel comprises an array substrate, a color film substrate a touch electrode layer located at a side of the color film substrate away from the array substrate, and a transparent electrically conductive layer between the color film substrate and the touch electrode layer and insulated from the touch electrode layer. The transparent electrically conductive layer comprises a first area and a second area, a thickness of the transparent electrically conductive layer in the first area is greater than a thickness of the transparent electrically conductive layer in the second area, the transparent electrically conductive layer is suitable for being electrically connected to ground. A projection area of the touch electrode layer on the color film substrate overlaps with a projection area of the transparent electrically conductive layer located in the second area on the color film substrate.