Touch Panel Gap Electrode Bridge Structure

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Solution Overview

Problem

Touch panels with mounting holes suffer from integrity issues in the touch electrodes, leading to poor linearity of drawn lines due to differences in mutual capacitance values between gap and normal regions.

Innovation Solution

The touch panel design includes a touch function layer with first and second touch units, featuring gap electrodes that are electrically connected to form integrated electrodes, and bridge structures that enhance capacitance values, ensuring increased facing areas and improved linearity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If mounting holes are provided in the touch area, then device functionality is improved, but integrity of touch electrodes deteriorates

Engineering Contradiction:

Improvedevice functionalityVSAvoidintegrity of touch electrodes

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The touch electrode is divided into multiple segments (first touch electrode and second touch electrode) that are separated by the mounting hole. Bridge structures are then used to connect these segments, allowing the electrode to maintain functionality despite the interruption caused by the mounting hole.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Bridge structures serve as intermediary elements that connect the first and second touch electrodes across the mounting hole. These bridge structures act as mediators that restore electrical continuity and maintain the integrity of the touch electrode system despite the presence of the mounting hole.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If touch electrodes are interrupted by mounting holes, then device functionality is improved, but mutual capacitance values deteriorate

Engineering Contradiction:

Improvedevice functionalityVSAvoidmutual capacitance values

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent adjusts the geometric parameters of the touch electrodes and bridge structures to compensate for the capacitance loss caused by mounting holes. By optimizing the dimensions, positions, and shapes of the electrode segments and bridge structures, the mutual capacitance values are maintained at acceptable levels despite the interruptions.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If touch electrodes are interrupted by mounting holes, then device functionality is improved, but linearity of drawn lines deteriorates

Engineering Contradiction:

Improvedevice functionalityVSAvoidlinearity of drawn lines

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies different design strategies to different regions of the touch electrode. Bridge structures are added locally at positions where mounting holes interrupt the electrodes, while other regions maintain their original continuous structure. This localized approach ensures that linearity is restored only where needed, minimizing overall complexity.

Inventive Principle:

Principle #3Local quality

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

This design enhances the contour perimeters and facing areas of touch electrodes in gap regions, leading to increased mutual capacitance values and improved linearity of drawn lines, addressing the poor linearity issues in existing touch panels.

Implementation Method 1

a mutual capacitance value between a whole of the first gap electrode and the second gap electrode, and a whole of the third gap electrode and the fourth gap electrode is C1

Methodology Applied

Scientific EffectMutual capacitance: Capacitance

Data Source

PatentUS12314522B2Touch panel and touch display apparatus

Publication Date: 2025.05.27 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A touch panel includes a base substrate having at least two mounting holes, and a touch function layer including first and second touch units. Each first touch unit includes first touch electrodes located in a same layer, and each second touch unit includes second touch electrodes located in a same layer and insulated from the first touch electrodes. The touch function layer is hollowed out at positions corresponding to the at least two mounting holes and has a gap region at a position corresponding to a region between two adjacent mounting holes. In a first touch unit, first touch electrodes located in the gap region serve as a first gap electrode and a second gap electrode. In a second touch unit, second touch electrodes located in the gap region serve as a third gap electrode located between the first and second gap electrodes and a fourth gap electrode.