Touch Substrate Dummy Electrode Static Charge Dissipation

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Solution Overview

Problem

The bonding processes in touch screen manufacturing generate static electricity, which is difficult to dissipate, leading to electrostatic charge accumulation and abnormal displays in liquid crystal displays due to external electric field interference.

Innovation Solution

A touch substrate with an electrostatic transmission layer, insulating layers, and conductive layers, including touch and dummy electrodes, where the dummy electrodes are connected to the electrostatic transmission layer via vias, facilitating charge discharge and reducing static electricity storage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If bonding processes are performed during touch screen manufacturing, then the touch screen can be assembled, but static electricity is generated and accumulated causing abnormal displays

Engineering Contradiction:

Improvebonding processVSAvoidelectrostatic charge accumulation

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent introduces dummy electrodes that convert the harmful static electricity generated during bonding into a beneficial discharge mechanism. The dummy electrodes are connected to the electrostatic transmission layer through vias, creating a controlled path for static charge dissipation. This transforms the harmful electrostatic accumulation into a manageable electrical phenomenon that can be safely discharged, preventing display abnormalities while maintaining the necessary bonding processes.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The dummy electrodes serve as intermediary elements between the electrostatic transmission layer and the external environment. These intermediaries provide a dedicated channel for static charge transfer, mediating the interaction between the bonding process-generated static electricity and the display system. By introducing this intermediary discharge path, the patent prevents direct interference between accumulated static charges and the liquid crystal display, thereby eliminating abnormal displays while preserving manufacturing capabilities.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If dummy electrodes are added to discharge static electricity, then electrostatic charge storage is reduced, but device structure becomes more complex

Engineering Contradiction:

Improveelectrostatic charge storageVSAvoidelectrode structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent segments the electrode system into functional components: touch electrodes for user interaction and dummy electrodes for electrostatic discharge. This segmentation allows each component to perform its specific function independently. The dummy electrodes are strategically positioned and connected through vias to the electrostatic transmission layer, creating a segmented but integrated structure that reduces electrostatic charge storage without requiring complete structural redesign.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The dummy electrodes are designed to serve multiple functions within a single structural element. They provide electrostatic discharge pathways, maintain structural integrity during bonding processes, and do not interfere with touch sensitivity. By making the dummy electrodes multi-functional, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving effective electrostatic charge reduction.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively reduces electrostatic charge storage, preventing abnormal displays and shadow elimination issues, while maintaining low mutual capacitance and compatibility with active pens.

Implementation Method 1

the second dummy electrode is electrically connected to the electrostatic transmission layer by means of a via penetrating the first insulating layer and the second insulating layer

Methodology Applied

Scientific EffectElectrostatic transmission: Electrostatics

Implementation Method 2

the second dummy electrode is electrically connected to the electrostatic transmission layer by means of a via penetrating the first insulating layer and the second insulating layer

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS11803279B2Touch substrate, touch apparatus and method of preparation with dummy electrode connected to electrostatic transmission layer

Publication Date: 2023.10.31 HEFEI XINSHENG OPTOELECTRONICS TECH CO LTD

AI summary

Disclosed are a touch substrate and a preparation method thereof, and a touch apparatus. The touch substrate includes an electrostatic transmission layer, a first insulating layer, a first conductive layer, a second insulating layer, and a second conductive layer which are sequentially stacked, wherein the first conductive layer includes a first touch electrode, the second conductive layer includes a second touch electrode and a second dummy electrode which are insulated from each other, and the second dummy electrode is electrically connected to the electrostatic transmission layer by means of a via penetrating the first insulating layer and the second insulating layer; and/or, the first conductive layer further includes a plurality of first dummy electrodes insulated from one another, and the first dummy electrode and the first touch electrode are insulated from each other.