Touch Display Electrostatic Protection via Common Line
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Solution Overview
Problem
The integration of driving electrodes and sensing electrodes in touch display panels makes them susceptible to electrostatic discharge, leading to reduced product yield and damage, as existing technologies lack effective protection mechanisms for these components.
Innovation Solution
Incorporating an active electrostatic protection unit on the TFT array substrate, connected to the driving and sensing electrodes on the color filter substrate, which routes the protection signals through a common electrode line, effectively shielding these electrodes from electrostatic discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If driving electrodes and sensing electrodes are integrated on the color filter substrate, then the touch display panel achieves touch functionality, but the electrodes become susceptible to electrostatic discharge damage
Solution Approach 1:
The patent introduces an electrostatic protection unit as an intermediary component between the driving/sensing electrodes and the common electrode line. This protection unit acts as a mediator that selectively conducts electrostatic discharge currents while blocking normal operating voltages, thereby protecting the electrodes from ESD damage without affecting touch functionality.
Solution Approach 2:
The patent segments the electrode system by introducing separate protection paths through the electrostatic protection unit. The driving electrodes and sensing electrodes are electrically insulated from each other and connected to the common electrode line through distinct protection pathways, allowing independent protection of each electrode type while maintaining overall system functionality.
2Reliability
If electrostatic protection is added to protect driving and sensing electrodes, then electrode reliability improves, but device complexity increases
Solution Approach 1:
The patent merges the electrostatic protection function with the existing common electrode line structure. The electrostatic protection unit is integrated into the common electrode line, allowing the common electrode to serve dual purposes: maintaining electrode potentials during normal operation and providing a discharge path for electrostatic protection, thereby reducing overall device complexity.
Solution Approach 2:
The common electrode line is designed to perform multiple functions: it maintains the electrical potential of driving and sensing electrodes during normal operation and simultaneously serves as the discharge path for the electrostatic protection unit. This multi-functionality eliminates the need for separate protection structures, reducing device complexity.
Data Source
AI summary
A touch display panel and a display device with the same includes driving electrodes, sensing electrodes insulated from each other, driving electrode leads, sensing electrode leads, first external terminals and second external terminals, all disposed on the color filter substrate. The driving electrodes are respectively connected with the first external terminals by the driving electrode leads, the sensing electrodes are respectively connected with the second external terminals by the sensing electrode leads; third external terminals on a TFT array substrate respectively correspond to and are electrically connected with the first external terminals, fourth external terminals on the TFT array substrate respectively correspond to and are electrically connected with the second external terminals; the third external terminals and the fourth external terminals are connected with a common electrode line through an electrostatic protection unit, thereby protecting the driving electrodes and the sensing electrodes against electrostatic discharge.