Touch Substrate Light Filtering to Hide Infrared Holes
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Solution Overview
Problem
Existing touch screens have a significant color difference between infrared filtering holes and the border area, making the holes easily distinguishable and detracting from the visual appearance.
Innovation Solution
A touch substrate design with a border area featuring a light filtering sub-area and a light shielding sub-area, where the lightness difference is less than 3.6, and a reflection enhancement layer is used to minimize color contrast, along with a specific thickness and material selection for the light shielding layer to maintain functionality without increased thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through-hole structure is used for infrared filtering, then infrared transmission function is achieved, but color difference with border area increases and visual appearance deteriorates
Solution Approach 1:
The patent applies color matching by selecting ink materials with specific light absorption characteristics that match the border area color. The ink layer is formulated to have the same color as the border area while maintaining infrared transmission properties, thereby eliminating the visual color difference between the through-hole and surrounding areas.
Solution Approach 2:
The patent uses a composite structure combining a transparent substrate, light shielding layer, and infrared-transmissive ink layer. This multi-layer composite material system achieves both the infrared transmission function and the color matching requirement by selecting materials with specific optical properties for each layer.
2Illumination intensity
If light shielding layer thickness is increased to improve color matching, then color consistency improves, but substrate thickness increases
Solution Approach 1:
The patent optimizes the thickness parameter of the light shielding layer to a specific range (1.5-2.3 μm) that achieves sufficient color matching while preventing excessive thickness. This parameter optimization balances color consistency requirements with the need to maintain overall substrate thickness within acceptable limits.
Solution Approach 2:
The patent applies the light shielding layer locally only in the border area where color matching is needed, rather than uniformly across the entire substrate. This localized application achieves color consistency in the border region without unnecessarily increasing the thickness of the entire substrate structure.
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 design effectively hides the infrared filtering holes, providing a uniform visual experience and maintaining the touch substrate's functionality with improved color consistency and reduced moisture and dirt impact on electrical characteristics.
Implementation Method 1
a light filtering sub-area for transmitting light of a predetermined wavelength band
Implementation Method 2
a reflection enhancement layer is used to minimize color contrast
Data Source
Figure 1~3
Figure 4~6a
Figure 6b~7b
AI summary
A touch substrate, a manufacturing method thereof and a touch device are provided. The touch substrate includes a touch area and a border area surrounding the touch area, wherein the border area includes a light filtering sub-area for transmitting light of a predetermined wavelength band and a light shielding sub-area surrounding the light filtering sub-area, and a difference between lightness of the light shielding sub-area and lightness of the light filtering sub-area is less than 3.6.