Touch Display Panel Conductive Layer Electrostatic Shielding
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Solution Overview
Problem
Conventional touch electrodes in display devices suffer from poor separation between adjacent electrodes, leading to false triggering by fingers and susceptibility to static electricity, causing unintended activation.
Innovation Solution
A touch display panel design featuring a grid-shaped conductive layer on the second substrate with openings exposing touch electrodes, increasing the separation distance between electrodes and grounding or connecting the conductive layer to a constant potential to reduce electrostatic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch electrodes are disposed in an array on the first substrate, then the touch display panel can achieve touch function, but adjacent touch electrodes have poor separation and are easily triggered falsely by fingers
Solution Approach 1:
A conductive layer is introduced as an intermediary component between the touch electrodes and the external environment. This conductive layer acts as a mediator that shields the touch electrodes from direct contact with external objects, preventing false triggering while maintaining the touch function. The conductive layer is disposed on the second substrate and includes openings that expose portions of the touch electrodes.
Solution Approach 2:
The conductive layer is implemented as a thin film structure on the second substrate. This thin film provides electrostatic shielding and separates adjacent touch electrodes effectively. The thin film nature of the conductive layer allows it to be transparent or translucent, maintaining display performance while providing the necessary shielding function.
2Reliability
If touch electrodes are disposed in an array, then the display device can achieve touch function, but the display device is susceptible to static electricity and causes unintended activation
Solution Approach 1:
The conductive layer serves as an intermediary shielding layer that protects the touch electrodes from static electricity. By grounding or connecting the conductive layer to a constant potential, it creates an electrostatic shield that prevents static charge accumulation on the touch electrodes, thereby reducing sensitivity to static electricity and preventing unintended activation.
Solution Approach 2:
The conductive layer is grounded or connected to a constant potential during touch operation, changing the electrical parameter state of the system. This parameter change creates a stable electrostatic environment that prevents static electricity from affecting the touch electrodes, improving reliability and reducing false triggering.
3Reliability
If a conductive layer is added to improve electrode separation and shielding, then false triggering is reduced, but the device structure becomes more complex
Solution Approach 1:
The conductive layer is designed to perform multiple functions simultaneously: it provides electrostatic shielding for the touch electrodes, creates separation between adjacent electrodes, and can be grounded to provide a reference potential. By making the conductive layer multi-functional, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The conductive layer is implemented as a thin film structure that can be easily integrated into the existing display panel architecture. The thin film nature allows it to be deposited using standard semiconductor manufacturing processes, minimizing the complexity increase and enabling efficient fabrication.
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
Enhances finger separation between touch electrodes, reducing false triggering and static electricity effects, while maintaining efficient fabrication and minimal impact on display performance.
Implementation Method 1
a projection of the conductive layer on the second substrate overlaps the touch electrodes, and the conductive layer is grounded or connected to a constant potential during a touch period
Data Source
AI summary
A touch display panel is disclosed. The touch display panel includes a first substrate, a second substrate disposed opposite to the first substrate, and a plurality of touch electrodes disposed on a side of the first substrate facing the second substrate. The plurality of touch electrodes are disposed in an array. The touch display panel also includes a conductive layer disposed on the second substrate, where the conductive layer includes a plurality of openings, and where portions of the touch electrodes are exposed through the openings. In addition, a projection of the conductive layer on the second substrate overlaps the touch electrodes, and the conductive layer is grounded or connected to a constant potential during a touch period.