Touch Screen Panel Dual Insulation Layer Haze Reduction
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Solution Overview
Problem
Existing touch screen panels face reliability issues due to damage to the substrate during etching and haze defects caused by the metal in the single insulation layer acting as a mask, leading to transmittance and reflectance defects.
Innovation Solution
A touch screen panel design that includes a first sensing insulation layer with a higher refractive index and a second sensing insulation layer with a lower refractive index, both transparent and containing metal, which prevents substrate damage and reduces haze defects by etching only the second insulation layer, thereby increasing light transmittance and panel reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single insulation layer containing metal is used, then the fabrication process is simplified, but substrate damage occurs during etching and haze defects are caused
Solution Approach 1:
The single insulation layer is divided into two separate layers: a first insulation layer (higher refractive index, 1.7-2.0) and a second insulation layer (lower refractive index, 1.3-1.5) containing the metal. This segmentation allows selective etching of only the second layer, preventing substrate damage and reducing haze defects while maintaining fabrication feasibility.
2Ease of manufacture
If the insulation layer refractive index is not optimized, then manufacturing is easier, but light transmittance and haze performance deteriorate
Solution Approach 1:
The patent specifies precise refractive index parameters for each layer: the first insulation layer has a refractive index of 1.7-2.0 and the second insulation layer has a refractive index of 1.3-1.5. This parameter optimization ensures excellent light transmittance (89%-93%) and haze control (0.9%-1.5%) while maintaining ease of manufacture through standard fabrication processes.
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 design enhances the reliability of touch screen panels by preventing substrate damage and improving light transmittance, resulting in reduced haze and increased transmittance values within the range of 0.9% to 1.5% haze and 89% to 93% transmittance, indicating excellent panel performance.
Implementation Method 1
a first sensing insulation layer on the touch substrate, the first sensing insulation layer having a first refractive index, a second sensing insulation layer on the first sensing insulation layer, the second sensing insulation layer having a second refractive index lower than the first refractive index
Data Source
AI summary
A touch screen panel includes a touch substrate, and a sensing electrode on the touch substrate, the sensing electrode recognizing a touch of a user and having a first sensing insulation layer on the touch substrate, the first sensing insulation layer having a first refractive index, a second sensing insulation layer on the first sensing insulation layer, the second sensing insulation layer having a second refractive index lower than the first refractive index, and the second sensing insulation layer including metal, and a sensing transparent conductive layer on the second sensing insulation layer.