Touch Substrate Bridging Electrode Layout to Prevent Short Circuits

Solution Overview

Problem

The formation of metal residues during the process of forming touch electrodes in display apparatuses can cause short circuits between different touch electrodes, leading to a failure of the touch function.

Innovation Solution

The design of a touch substrate with bridging electrodes that have a line width greater than the touch electrodes in spacing regions, featuring symmetric or asymmetric connection portions, ensures that residual metal at the edge of the bridging electrodes is discontinuous, preventing short circuits by maintaining a gap with the sub-electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the line width of the bridging electrode is made larger to avoid short circuits, then the reliability of the touch electrode insulation is improved, but the manufacturing precision requirement increases

Engineering Contradiction:

Improveinsulation reliabilityVSAvoidline width control precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The bridging electrode has different line widths at different locations: a first line width in the spacing region (larger width for insulation) and a second line width in the connection region (smaller width for precise alignment). This local differentiation allows the electrode to simultaneously achieve reliable insulation and precise manufacturing.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The bridging electrode is divided into multiple sections with different line widths: a first section in the spacing region with larger line width and a second section in the connection region with smaller line width. This segmentation enables each section to optimize its function independently.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If the line width of the bridging electrode is made smaller to improve manufacturing precision, then the manufacturing precision is improved, but the risk of short circuits between touch electrodes increases

Engineering Contradiction:

Improveline width control precisionVSAvoidinsulation reliability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The bridging electrode has different line widths at different locations: a first line width in the spacing region (larger width for insulation) and a second line width in the connection region (smaller width for precise alignment). This local differentiation allows the electrode to simultaneously achieve reliable insulation and precise manufacturing.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The bridging electrode is divided into multiple sections with different line widths: a first section in the spacing region with larger line width and a second section in the connection region with smaller line width. This segmentation enables each section to optimize its function independently.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the spacing region is enlarged to prevent short circuits, then the insulation reliability is improved, but the area occupied by the touch electrode structure increases

Engineering Contradiction:

Improveinsulation reliabilityVSAvoidtouch electrode structure area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The bridging electrode has different line widths at different locations: a first line width in the spacing region (larger width for insulation) and a second line width in the connection region (smaller width for precise alignment). This local differentiation allows the electrode to simultaneously achieve reliable insulation and precise manufacturing.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The bridging electrode is divided into multiple sections with different line widths: a first section in the spacing region with larger line width and a second section in the connection region with smaller line width. This segmentation enables each section to optimize its function independently.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12487720B2Touch substrate, touch display panel and display apparatus

Publication Date: 2025.12.02 BEIJING BOE TECH DEV CO LTD

AI summary

The present disclosure provides a touch substrate, a touch display panel and a display apparatus. A line width of at least a part of a bridging electrode in a spacing region between a sub-electrode of a corresponding first touch electrode and a corresponding second touch electrode in a first direction is greater than a line width of the corresponding second touch electrode, so that a routing length of an edge of the bridging electrode in the spacing region can be increased, or so that a certain gap exists between the sub-electrode and the residual metal at the edge of the bridging electrode, the sub-electrode is insulated from the residual metal, the short circuit between the first touch electrode where the sub-electrode is located and the second touch electrode due to the metal residue can be avoided, and the touch quality of the touch substrate can be ensured.