Staggered Touch Electrode Grid Units for Short Circuit Prevention

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Solution Overview

Problem

In touch display devices, the likelihood of short circuits between touch signal lines and electrodes in different layers can lead to inaccurate touch position responses due to foreign matter interference, causing the touch panel to fail.

Innovation Solution

The design incorporates touch electrodes and leads with grid units that have a staggered or partially overlapping arrangement, ensuring the overlap area between corresponding grid units is less than the area of each unit, reducing the risk of short circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the touch signal line and touch electrode are arranged in different layers with complete overlap, then the electrical connection is improved, but the risk of short circuit due to foreign matter increases

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidshort circuit risk from foreign matter

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The touch electrode and touch signal line are divided into discrete grid units (first grid units and second grid units) arranged in a matrix pattern. This segmentation allows selective electrical connection through contact holes while reducing the continuous overlap area between different layers, thereby minimizing the risk of short circuits caused by foreign matter while maintaining necessary electrical connections.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the grid units have different properties: some grid units are electrically connected through contact holes where foreign matter is less likely to cause short circuits, while other regions maintain spatial separation to prevent short circuits. The insulating layer is selectively applied in specific areas to enable connection where needed while preventing connection where harmful.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the touch electrode and touch signal line are completely separated to avoid short circuit, then the short circuit risk is reduced, but the touch response accuracy deteriorates

Engineering Contradiction:

Improveshort circuit riskVSAvoidtouch position response accuracy

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The grid units are segmented into first grid units (touch electrodes) and second grid units (touch signal lines) that are partially overlapping. This segmentation enables precise control over which areas are electrically connected and which are separated, maintaining touch response accuracy through selective connection while preventing short circuits in non-connected areas.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12175046B2Display panel and touch component

Publication Date: 2024.12.24 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

A display panel is provided. The display panel includes: a touch electrode layer including a plurality of touch electrodes, each of the touch electrodes includes a plurality of first grid units; and a touch electrode lead layer including a plurality of touch electrode leads, each of the touch electrode leads includes a plurality of second grid units, and the second grid units are arranged in one-to-one correspondence with the first grid units; wherein ratios of an overlap area between each of the second grid units and a corresponding one of the first grid units to an area of the corresponding first grid unit and to an area of the second grid unit are both less than 1.