Touch Panel Display Function Layer Polarization Etch Line
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Solution Overview
Problem
Touch-panel display devices face issues with visibility due to the line of etch between transparent conductive and etched regions, which affects the visual appearance and increases manufacturing costs, and existing index match layers are cumbersome and costly, hindering downscaling.
Innovation Solution
A touch-panel display device design that includes a substrate with a display module, a sensing module, and a function layer that polarizes light, either covering the viewable area or extending into the non-viewable area to conceal the line of etch and reduce color differences, potentially eliminating the need for additional polarizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conductive layer with etched regions is used to form sensing electrodes, then the touch panel achieves sensing functionality, but the line of etch becomes visible and affects appearance quality
Solution Approach 1:
The patent introduces an index match (IM) layer as an intermediary between the transparent conductive layer and the transparent substrate. This IM layer has a refractive index that matches both the ITO region and the etched region, serving as a mediator to eliminate the refractive index mismatch that causes visible etch lines. The IM layer thickness is optimized to be greater than the etch depth to ensure complete optical matching.
Solution Approach 2:
The patent changes the refractive index parameter of the intermediate layer to match the surrounding materials. By selecting a material with appropriate refractive index and controlling its thickness, the optical properties are adjusted to eliminate the visible boundary between etched and non-etched regions while maintaining sensing functionality.
2Manufacturing precision
If an index match (IM) layer is added to reduce etch line visibility, then appearance quality improves, but manufacturing process becomes more complex and costly
Solution Approach 1:
The patent integrates the IM layer into the existing touch panel manufacturing process as a multi-functional component. The IM layer not only serves to match refractive indices but also functions as part of the overall optical stack, potentially combining with other layers to achieve multiple objectives simultaneously, thereby reducing the need for separate dedicated processes.
3Manufacturing precision
If an index match (IM) layer is added to conceal etch lines, then visual appearance improves, but manufacturing cost increases
Solution Approach 1:
The patent optimizes the IM layer thickness parameter to be greater than the etch depth, which ensures complete optical matching while minimizing material usage. By carefully controlling this critical parameter, the solution achieves the desired visual appearance improvement while minimizing the amount of additional material and processing required, thereby controlling manufacturing costs.
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 solution effectively reduces the visibility of the line of etch, enhances the visual appearance, and lowers manufacturing costs by using a function layer to polarize light and conceal sensing electrodes, while also addressing light leakage and color consistency issues.
Implementation Method 1
the function layer is configured to polarize light emitted from the display module towards the substrate
Data Source
AI summary
The present disclosure provides a touch-panel display device. The touch-panel display device comprises a substrate, a display module, a sensing module and a function layer. The substrate includes a first surface and a second surface on opposite sides of the substrate, respectively. The display module is proximal to the first surface of the substrate, and the sensing module is disposed between the display module and the substrate. The function layer, disposed on either the first surface or the second surface of the substrate, is configured to polarize light emitted from the display module towards the substrate.