Dielectric Layer for Touch Panel Color Uniformity
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Solution Overview
Problem
Capacitive-type touch panels face visibility issues due to the thickness of the transparent conductive layer, leading to a difference in color between the active and peripheral areas, affecting the visual appearance and user experience.
Innovation Solution
Incorporating a dielectric layer between the cover plate and the display element to adjust the reflectivity of both areas using the principle of optical interference, making the reflected light spectrums from the active and peripheral areas similar, thus minimizing color differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conductive layer with great thickness is used to satisfy resistance requirements for touch sensors, then the electrical performance is improved, but the visibility in the active area deteriorates and color difference between active and peripheral areas increases
Solution Approach 1:
A dielectric layer is introduced as an intermediary component between the cover plate and the transparent conductive layer. This dielectric layer has optimized refractive index and thickness to control optical interference, thereby adjusting the reflectivity of the peripheral area to match the active area, improving overall visibility while maintaining the necessary electrical performance of the touch sensor
Solution Approach 2:
The patent changes optical parameters (refractive index and thickness) of the dielectric layer to control the reflectivity characteristics. By carefully selecting these parameters, the optical interference effect is optimized to reduce the color difference and improve visibility without compromising the electrical performance of the transparent conductive layer
2Reliability
If a transparent conductive layer with great thickness is used to satisfy resistance requirements, then the touch sensor functionality is improved, but the color difference between active and peripheral areas increases
Solution Approach 1:
The dielectric layer serves as an optical mediator that compensates for the visual defects caused by the thick transparent conductive layer. It adjusts the reflectivity of the peripheral area through controlled optical interference, making the appearance more uniform across active and peripheral areas while allowing the thick conductive layer to maintain its necessary thickness for touch sensor functionality
Solution Approach 2:
The dielectric layer is applied specifically in the peripheral area where the visual defect occurs, rather than uniformly across the entire touch panel. This localized application addresses the color difference issue in the peripheral area without affecting the active area, thereby improving overall appearance uniformity while maintaining touch sensor functionality
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
The dielectric layer ensures a uniform appearance by reducing the difference in reflectivity between the active and peripheral areas, enhancing the visual result and appearance of touch panels, making it difficult for users to distinguish between the two regions.
Implementation Method 1
uses a dielectric layer to adjust colors of an active area and a peripheral area of touch panels in appearance by the principle of optical interference
Data Source
AI summary
A touch panel is provided. The touch panel includes a cover plate and a display element under the cover plate. A touch sensing layer is disposed at an active area of the touch panel and between the cover plate and the display element. A decorative layer is disposed at a peripheral area of the touch panel and between the cover plate and the display element, wherein the active area is surrounded by the peripheral area. The touch panel further includes a dielectric layer disposed between the cover plate and the display element, wherein the difference in reflectivity between the active area and the peripheral area is 0 to 0.5.