Touch Detection Electrodes with Conductive Layers for Static Discharge
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Solution Overview
Problem
Touch detection accuracy and display performance in touch-detection capable display devices are compromised due to static electricity issues, as ultrafine metal wires in touch detection electrodes prevent easy discharge of electric charges, leading to potential deterioration in detection accuracy and display quality.
Innovation Solution
Incorporating a first and second conductive layer with higher sheet resistance than the metal wires, these layers are strategically positioned between and above the metal wires to facilitate the discharge of static electricity, preventing interference with the touch detection electrodes and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrafine metal wires are used for touch detection electrodes to achieve lower resistance and invisibility, then the resistance decreases and visibility is reduced, but static electricity cannot be discharged easily leading to deterioration in touch detection accuracy and display performance
Solution Approach 1:
The patent introduces a conductive layer as an intermediary between the ultrafine metal wire touch detection electrode and the substrate. This conductive layer has higher sheet resistance than the metal wire, allowing it to accumulate less static charge while still providing a discharge path. The conductive layer acts as a mediator that balances the conflicting requirements of maintaining low resistance for touch detection while enabling static electricity discharge to prevent accuracy deterioration.
2Area of stationary object
If ultrafine metal wires are used for touch detection electrodes to achieve larger screen area, then the screen area increases, but the smaller electrode area prevents easy discharge of electric charge
Solution Approach 1:
The patent resolves the contradiction by adding a vertical dimension to the problem solution. Instead of increasing the horizontal area of the ultrafine metal wire electrode (which would compromise screen area and invisibility), the solution introduces a conductive layer in the vertical dimension between the electrode and substrate. This layered approach allows the electrode to maintain its ultrafine, invisible characteristics while the conductive layer provides additional charge distribution and discharge capability in the vertical direction.
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 prevents static electricity from degrading touch detection accuracy and display quality by ensuring the efficient discharge of static charges, thereby enhancing the reliability and performance of touch-detection capable display devices.
Implementation Method 1
a first conductive layer overlapping the metal wires in contact therewith and provided between the substrate and the metal wires in a direction perpendicular to the substrate, and a second conductive layer provided above the metal wires
Data Source
AI summary
A touch detecting device and a touch-detection capable display device are provided each including: a substrate; a touch detection electrode provided on a plane parallel to the substrate and including a plurality of metal wires; a first conductive layer overlapping the metal wires in contact therewith and provided between the substrate and each of the metal wires in a direction perpendicular to the substrate; and a second conductive layer provided above the metal wires. At least one of the first conductive layer and the second conductive layer has a higher sheet resistance than the metal wires.