Capacitive Touch Panel Layout for Uniform Light Transmittance

Solution Overview

Problem

Conventional capacitive touch panels experience color aberration and uneven light transmittance due to the discrepancy between different layers, leading to suboptimal visual effects and display quality.

Innovation Solution

The capacitive touch panel design incorporates first and second touch pads with openings and corresponding dummy pads on other layers, along with additional dummy pads to improve light transmittance uniformity, reducing color aberration and enhancing visual effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If touch pads are disposed in different layers to achieve plane sensing, then sensing function is improved, but light transmittance uniformity deteriorates causing color aberration

Engineering Contradiction:

Improvesensing functionVSAvoidlight transmittance uniformity

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent applies local quality by making the touch pads semi-transparent rather than fully opaque, and by strategically positioning them in different layers with controlled transparency. This allows light to pass through the touch pad regions while maintaining sensing capability, thereby resolving the contradiction between sensing function and light transmittance uniformity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses asymmetric design in the arrangement and transparency of touch pads across different layers. The touch pads in different layers have different transparency characteristics, with the first touch pads being more transparent than the second touch pads. This asymmetric arrangement compensates for the light blocking effects and improves overall light transmittance uniformity.

Inventive Principle:

Principle #4Asymmetry

2Reliability

If touch pads are disposed in different layers, then plane sensing capability is improved, but display uniformity deteriorates due to visible touch pads

Engineering Contradiction:

Improveplane sensing capabilityVSAvoiddisplay uniformity

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent applies local quality by making the touch pads semi-transparent rather than fully opaque, and by strategically positioning them in different layers with controlled transparency. This allows light to pass through the touch pad regions while maintaining sensing capability, thereby resolving the contradiction between sensing function and light transmittance uniformity.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If conventional touch pad fabrication is used, then manufacturing process is simple, but visual effects deteriorate due to color aberration

Engineering Contradiction:

Improvefabrication simplicityVSAvoidvisual effects

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The patent applies local quality by making the touch pads semi-transparent rather than fully opaque, and by strategically positioning them in different layers with controlled transparency. This allows light to pass through the touch pad regions while maintaining sensing capability, thereby resolving the contradiction between sensing function and light transmittance uniformity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses asymmetric design in the arrangement and transparency of touch pads across different layers. The touch pads in different layers have different transparency characteristics, with the first touch pads being more transparent than the second touch pads. This asymmetric arrangement compensates for the light blocking effects and improves overall light transmittance uniformity.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS20090315859A1Capacitive touch panel and fabricating method thereof

Publication Date: 2009.12.24 AU OPTRONICS CORP

AI summary

A capacitive touch panel including a substrate, a plurality of first touch pads, a plurality of first dummy pads, an insulator layer, a plurality of second touch pads, and a plurality of second dummy pads is provided. The first touch pads arranged along a first direction are electrically connected. Each first touch pad has at least a first opening. The insulator layer covers the first touch pads and the first dummy pads insulated therefrom. The second touch pads arranged along a second direction are electrically connected and each second touch pad has at least a second opening. The size of the second opening is substantially larger than that of each first dummy pad. The second dummy pads insulated from the second touch pads are disposed on the insulator layer above the first opening, wherein the size of the first opening is substantially larger than that of each second dummy pad.