Touch Control Panel Static Discharge via Conductive Foam
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Solution Overview
Problem
Full-in-cell touch control panels are susceptible to damage from external static electricity due to the formation of a shielding layer when a conductive layer and silver paste dot are used, leading to impaired antistatic capability and failure of touch control signals.
Innovation Solution
A touch control panel design incorporating a high-impedance optical adhesive and conductive adhesive foam connected to a ground point on the array substrate, forming a static electricity conduction pathway that directs external static electricity to the ground terminal, preventing damage and enhancing antistatic capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer and silver paste dot are used to prevent external static electricity, then static electricity protection is provided, but a shielding layer is formed that blocks touch control signals
Solution Approach 1:
The patent extracts the conductive function from the traditional silver paste dot and conductive layer structure, replacing it with a conductive adhesive foam that can be directly attached to the array substrate. This extraction eliminates the need for the shielding layer formation while maintaining static electricity protection capability through the conductive adhesive foam's direct connection to ground.
Solution Approach 2:
The conductive adhesive foam serves as an intermediary element between the array substrate and the high-impedance optical adhesive. It provides both mechanical attachment and electrical conduction functions, acting as a mediator that prevents static electricity accumulation without forming a shielding layer that would block touch signals.
2Reliability
If a conductive layer is plated on the top surface of color filter substrate, then external static electricity is released, but the structure becomes more complex
Solution Approach 1:
The patent removes the complex plating process and multi-layer conductive structure from the color filter substrate. Instead, it uses a simple conductive adhesive foam that can be directly attached to the array substrate, significantly simplifying the overall structure while maintaining static electricity release functionality.
Solution Approach 2:
The conductive adhesive foam performs multiple functions simultaneously: it provides electrical conduction for static electricity release, serves as a mechanical attachment medium, and eliminates the need for separate plating processes. This multi-functionality reduces device complexity compared to traditional separate layers.
3Reliability
If silver paste dot is used to connect to ground terminal, then grounding is achieved, but manufacturing defects increase
Solution Approach 1:
The patent replaces the traditional silver paste dot with a conductive adhesive foam that can be easily applied and removed. This disposable-like approach allows for simpler manufacturing processes, better alignment, and reduced defects, thereby increasing yield rates while maintaining grounding connection reliability.
Solution Approach 2:
The patent substitutes the mechanical plating process with an adhesive-based attachment system. The conductive adhesive foam is attached to the array substrate using adhesive forces rather than requiring complex plating machinery and processes, leading to fewer manufacturing defects and higher productivity.
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 conducts static electricity away from internal structures, preventing damage and ensuring normal touch control function while improving the antistatic capability of the touch control panel, reducing defects and increasing yield rates by replacing silver paste with conductive adhesive foam.
Implementation Method 1
a high-impedance optical adhesive is provided above the polarizer, a ground point is provided on a surface of the array substrate towards the color filter substrate, and a conductive adhesive foam is attached on the ground point and is connected to the high-impedance optical adhesive
Implementation Method 2
a conductive adhesive foam is attached on the ground point and is connected to the high-impedance optical adhesive
Data Source
AI summary
A touch control panel, a display apparatus, and a production method of a touch control panel are provided, which relates to the technical field of display. Specifically, there provides a touch control panel, comprising: an array substrate; a color filter substrate which is cell-aligned with the array substrate; and a polarizer located on the color filter substrate, wherein a high-impedance optical adhesive is provided above the polarizer, a ground point is provided on a surface of the array substrate towards the color filter substrate, and a conductive adhesive foam is attached on the ground point and is connected to the high-impedance optical adhesive.