Touch Panel Refractive-Index Layering Against External Reflection
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Solution Overview
Problem
Electroluminescent display panels in touch display devices suffer from visibility issues due to external light reflection, which degrades image quality.
Innovation Solution
A touch panel structure is designed with alternating layers of high and low refractive indices, incorporating holes and depressions to trap external light within the panel, reducing reflectance and enhancing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an electroluminescent display panel is used in a touch display device, then power consumption is reduced and viewing angle is improved, but visibility deteriorates due to external light reflection
Solution Approach 1:
The patent applies parameter changes by modifying the refractive index of the adhesive layer to match that of the cover glass (both set to approximately 1.5). This refractive index matching eliminates the optical boundary between layers, preventing external light reflection and improving visibility while maintaining the power consumption advantages of electroluminescent display panels.
Solution Approach 2:
The patent uses composite materials by combining the cover glass, adhesive layer, and touch panel with coordinated refractive indices. The adhesive layer acts as an optical coupling medium between the cover glass and touch panel, creating a composite structure that minimizes reflection through refractive index matching while maintaining mechanical bonding.
2Ease of operation
If a double-layer touch screen with transparent embossed adhesive layers is used, then touch sensitivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent extracts the embossed structure from the adhesive layer and applies it only to the touch panel surface, while keeping the adhesive layer itself simple and flat. This separation allows the embossed features to enhance touch sensitivity without requiring the adhesive layer to be complex, thereby reducing manufacturing complexity while maintaining touch performance.
3Object-affected harmful factors
If multiple insulating layers with different refractive indices are disposed on the display panel, then external light reflectance is reduced and visibility is improved, but device structure becomes more complex
Solution Approach 1:
The patent changes the refractive index parameter of the adhesive layer to match the cover glass (both approximately 1.5), eliminating the need for multiple insulating layers with different refractive indices. This single-layer approach with matched refractive indices achieves the same anti-reflection effect while simplifying the device 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 proposed structure effectively minimizes external light reflectance, improving visibility and reducing the visibility of electrode patterns, especially when viewed from oblique angles.
Implementation Method 1
A touch panel structure is designed with alternating layers of high and low refractive indices, incorporating holes and depressions to trap external light within the panel
Implementation Method 2
The proposed structure effectively minimizes external light reflectance, improving visibility and reducing the visibility of electrode patterns
Data Source
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AI summary
A touch panel (120) and a touch display device (100) with the same are disclosed. A touch panel (120) is disclosed in which at least one layer of a first insulating layer is disposed on a display panel (110), first touch electrodes (260) are disposed on the first insulating layer, at least one second insulating layer is disposed on a first touch electrode, second touch electrodes (270) are disposed on the second insulating layer, a third insulating layer is disposed on the second insulating layer on which the second touch electrodes (270) are disposed, each of the first touch electrodes (260) and each of the second touch electrodes (270) overlap each other, and a refractive index of at least one of the first insulating layer, the second insulating layer and the third insulating layer is different from that of the other insulating layers, thereby improving the visibility of the touch display device (100).