Touch Module Refractive Index Gradient Reduces Reflectivity
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Solution Overview
Problem
Existing touch display panels suffer from high reflectivity of touch electrode patterns under ambient light, affecting display clarity and user experience due to inconsistent optical path differences between electrode blocks and slits, which current index matching films fail to adequately address for stringent low-reflectivity requirements.
Innovation Solution
A touch module with a layered structure comprising a substrate, touch electrode layer, and multiple inorganic material layers with specific refractive index gradients, where the refractive index of each layer is progressively decreased to minimize optical path differences and reduce reflectivity, achieved by adjusting film thickness and composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transparent conductive material layers are used to form touch electrode patterns, then the touch device can detect touch input, but the light transmittance is poor and the patterns are easily noticeable by human eyes
Solution Approach 1:
An index matching film is introduced as an intermediary layer between the touch electrode patterns and the external environment. This film has a refractive index that matches the transparent conductive material, serving as an optical mediator that reduces the refractive index difference at the interface, thereby reducing reflection and improving light transmittance without affecting the touch detection function
Solution Approach 2:
The refractive index parameter of the interface between the touch electrode layer and surrounding media is changed by introducing the index matching film. By selecting a material with appropriate refractive index for the film, the optical properties of the system are optimized to reduce visibility of the patterns while maintaining electrical functionality
2Illumination intensity
If index matching film is added to reduce reflectivity, then light transmittance is improved, but the structure complexity and manufacturing difficulty increase
Solution Approach 1:
The index matching film is designed to serve multiple functions simultaneously: it reduces reflectivity to improve light transmittance, protects the touch electrode patterns, and can be integrated with existing touch panel layers. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall structure complexity
3Illumination intensity
If index matching film is added to reduce reflectivity, then display clarity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Instead of requiring extremely precise thickness control, the solution changes the material parameter (refractive index) of the index matching film to achieve the desired optical effect. By selecting a material whose refractive index closely matches the transparent conductive material, the system achieves low reflectivity with more relaxed thickness tolerance, thereby reducing manufacturing precision requirements
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 reflectivity to near zero, enhancing display clarity and meeting stringent low-reflectivity requirements by ensuring the touch electrode layer is invisible under ambient light, thereby improving user experience and display quality.
Implementation Method 1
A refractive index of the touch electrode layer is greater than a refractive index of the first inorganic material layer; the refractive index of the first inorganic material layer is greater than a refractive index of the at least one second inorganic material layer; and the refractive index of the touch electrode layer is greater than a refractive index of the at least one third inorganic material layer
Data Source
AI summary
A touch module, a touch display panel and a touch display device are provided. The touch module includes a substrate; at least one touch electrode layer disposed over the substrate; a first inorganic material layer disposed over a side of the touch electrode layer away from the substrate; at least one second inorganic material layer disposed over a side of the first inorganic material layer away from the touch electrode layer; and at least one third inorganic material layer disposed over a side of the touch electrode layer adjacent to the substrate. A refractive index of the touch electrode layer is greater than that of the first inorganic material layer; the refractive index of the first inorganic material layer is greater than that of the second inorganic material layer; and the refractive index of the touch electrode layer is greater than that of the third inorganic material layer.