Touch Screen Panel Border Dummy Patterns

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Solution Overview

Problem

Capacitive touch screen panels face issues with visible sensing patterns at the border of the touch active region, leading to potential pattern reflection and an unsightly appearance.

Innovation Solution

The implementation of dummy patterns made of the same transparent material as the sensing cells, extending outside the touch active region and connected to the sensing cells at the border, which are shaped as triangles, rectangles, or combinations thereof, to prevent pattern visibility while maintaining pattern continuity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the sensing pattern stops at the border of the touch active region, then the touch active region is clearly defined, but the sensing pattern becomes viewable at the border causing pattern reflection

Engineering Contradiction:

Improvetouch active region definitionVSAvoidpattern reflection

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

Dummy patterns are introduced as intermediary elements between the sensing patterns and the border of the touch active region. These dummy patterns serve as a transition zone that prevents the abrupt stop of sensing patterns at the border, thereby eliminating pattern reflection while maintaining clear definition of the touch active region.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The dummy patterns are positioned in advance at the border area of the touch active region, before the sensing patterns actually stop. This preliminary placement creates a gradual transition zone that prevents the harmful pattern reflection effect before it can occur.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If dummy patterns are added to prevent pattern visibility, then pattern reflection is prevented, but the device complexity increases

Engineering Contradiction:

Improvepattern reflectionVSAvoidsensing cell arrangement

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The dummy patterns are applied locally only at the border area of the touch active region, rather than throughout the entire sensing area. This localized application minimizes the increase in device complexity while effectively preventing pattern reflection at the critical border zones.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The dummy patterns are created as simplified copies or extensions of the sensing patterns themselves, using the same pattern design language. This copying approach integrates seamlessly with the existing sensing pattern structure, reducing the perceived complexity increase compared to introducing entirely new structural elements.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS8754870B2Touch screen panel

Publication Date: 2014.06.17 SAMSUNG DISPLAY CO LTD

AI summary

A touch screen panel that prevents sensing patterns from being viewable at a border of a touch active region. The touch screen panel includes: a transparent substrate; first sensing cells and second sensing cells alternately distributed in a touch active region on the transparent substrate; first connection patterns connecting the first sensing cells in a first direction; second connection patterns connecting the second sensing patterns in a second direction crossing the first direction; and dummy patterns extending outside the touch active region and connected with the first sensing cells and the second sensing cells at a border of the touch active region.