Touch Substrate Light-Shielding Pattern ESD Protection
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Solution Overview
Problem
Touch devices face micro-short circuiting due to electrostatic charges accumulating and puncturing the light-shielding pattern, leading to loss of touch function, and existing solutions increase production costs by adding insulating layers to prevent this.
Innovation Solution
A touch substrate design with a light-shielding region connected to virtual electrodes via insulated bridges and a ground wire, allowing electrostatic charges to be released, thereby preventing the light-shielding pattern from becoming conductive and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer is added between the light-shielding pattern and the touch electrodes to prevent micro-short circuiting, then the reliability of the light-shielding pattern is improved, but the manufacturing cost increases and the device complexity increases
Solution Approach 1:
The patent extracts the essential function of the insulating layer (preventing micro-short circuiting) and implements it through a simplified structure: the light-shielding pattern itself is designed with extended portions that directly prevent contact between adjacent touch electrodes, eliminating the need for additional insulating layers while maintaining reliability
Solution Approach 2:
The light-shielding pattern is segmented into multiple extended portions positioned between adjacent touch electrodes, with each segment providing independent protection against micro-short circuiting. This segmentation allows the light-shielding pattern to fulfill both its original light-shielding function and the additional function of electrical isolation
2Reliability
If an insulating layer is added to prevent micro-short circuiting, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The light-shielding pattern is designed to serve multiple functions simultaneously: (1) light shielding, (2) electrical isolation between touch electrodes, and (3) electrostatic discharge protection. This multi-functionality eliminates the need for separate insulating layers, reducing manufacturing cost while maintaining reliability
3Object-affected harmful factors
If the light-shielding pattern is made conductive due to puncture by electrostatic charges, then the harmful effect of electrostatic discharge is increased, but this is the natural consequence of pattern puncture
Solution Approach 1:
The light-shielding pattern is preliminarily designed with extended portions that create physical separation between adjacent touch electrodes before any electrostatic discharge can occur. This preliminary structural arrangement prevents the harmful effect of micro-short circuiting even if the pattern is later punctured by electrostatic charges
Solution Approach 2:
The extended portions of the light-shielding pattern act as a protective cushion between adjacent touch electrodes, absorbing or preventing the harmful effects of electrostatic discharge before it can cause micro-short circuiting. This beforehand cushioning ensures touch function stability even under electrostatic stress
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 protects the light-shielding pattern from puncture and micro-short circuiting, maintaining touch functionality while reducing production costs by eliminating the need for insulating layers.
Implementation Method 1
portions of adjacent virtual electrodes at the light-shielding region are connected to each other via a first bridge, where the first bridge is insulated from the first touch electrode and the second touch electrode
Implementation Method 2
a first ground wire is arranged at the light-shielding region, and the first ground wire is electrically connected to the virtual electrodes connected to each other via the first bridge
Data Source
AI summary
A touch substrate and a method for forming the same, and a touch display device are provided, relating to the field of display technology. The touch substrate includes a touch region and a light-shielding region surrounding the touch region, a light-shielding pattern is arranged at the light-shielding region; the touch substrate further includes a first touch electrode and a second touch electrode crossing each other and insulated from each other and virtual electrodes at regions defined by the first touch electrode and the second touch electrode, and each virtual electrode is spaced apart from the first touch electrode and the second touch electrode; the first touch electrode, the second touch electrode and the virtual electrodes contact the light-shielding pattern; portions of adjacent virtual electrodes at the light-shielding region are connected to each other via a first bridge, the first bridge is insulated from the first touch electrode and the second touch electrode; and a first ground wire is arranged at the light-shielding region, and the first ground wire is electrically connected to the virtual electrodes connected to each other via the first bridge.