Touch Panel Dummy Electrode Optical Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display devices with touch functions, particularly in vehicle central control systems, the difference in light reflection and refraction effects between touch button areas and display areas leads to poor optical uniformity, affecting the display effect.
Innovation Solution
A touch panel design featuring a substrate with a bridging layer, insulating layer, and touch layer, including mutual-capacitance and self-capacitance button portions, where a dummy electrode is placed between touch electrodes to approximate light reflection and refraction effects, and shielding bodies with wire grooves to prevent signal crosstalk and improve optical uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch buttons are arranged in the peripheral area outside the display area, then touch operations can be achieved, but optical uniformity deteriorates due to difference in light reflection and refraction effects
Solution Approach 1:
The patent applies local quality by introducing a dummy electrode in the peripheral area that has different structural characteristics from the touch electrodes. The dummy electrode is designed with specific geometry and material properties to match the optical characteristics of the display area while maintaining electrical isolation, thus creating local optical uniformity without affecting touch functionality.
Solution Approach 2:
The dummy electrode serves as an intermediary element between the touch electrodes and the display area. It mediates the optical interaction by reflecting and refracting light in a manner that matches the display area's optical characteristics, thereby eliminating the visual discontinuity caused by touch buttons in the peripheral area.
2Measurement precision
If shielding bodies are added to prevent signal crosstalk, then touch accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges the shielding function with the existing electrode structure by making the dummy electrode also serve as a shielding element. The dummy electrode is positioned and configured to prevent signal crosstalk between adjacent touch electrodes while maintaining optical uniformity, thus combining multiple functions into a single structural element.
Solution Approach 2:
The dummy electrode is designed to perform multiple functions simultaneously: it provides optical matching to maintain uniformity, acts as a shielding body to prevent signal crosstalk, and maintains electrical isolation from touch electrodes. This multi-functionality reduces the need for additional separate components.
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
Enhances optical uniformity and touch accuracy by matching light effects between touch and display areas, while preventing signal interference and ensuring reliable touch operations.
Implementation Method 1
there is a significant difference between light reflection and light refraction effects in an area where the touch buttons are located and that in the display area
Implementation Method 2
there is a significant difference between light reflection and light refraction effects in an area where the touch buttons are located and that in the display area
Implementation Method 3
a second shielding body is disposed between the second touch area and the first touch area
Data Source
AI summary
A touch panel includes: a substrate; a bridging layer; an insulating layer; and a touch layer, including a first touch area and a border area surrounding the first touch area; the border area includes at least one second touch area, and the second touch area includes a plurality of button portions; a second shielding body is disposed between the second touch area and the first touch area; the border area further includes a bonding area for bonding with a driving circuit board; the second shielding body is provided with at least one wire groove, and at least one touch wire is coupled to the bonding area by passing through the wire groove; and the touch layer is disposed on a surface of the insulating layer away from the substrate, and at least two adjacent shielding units are coupled by the bridging layer.