Touch Screen Panel with Stacked Sensing Patterns and Refractive Index Films
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Solution Overview
Problem
The existing touch screen panels, particularly the electrostatic capacitive type, face challenges in simplifying the fabrication process and reducing light reflectance differences, which complicates the manufacturing and affects image uniformity.
Innovation Solution
A touch screen panel design with first and second sensing patterns on different layers, using transparent substrates and insulating films with varying optical refractive indexes, and specific compositions such as ITO and SiO2/ZrO2/TiO2, to reduce the number of masks required and minimize light reflectance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If first and second sensing patterns are positioned on the same layer and coupled by forming separate coupling patterns through contact holes, then the sensing patterns can be electrically connected, but additional masks are required and the fabrication process becomes complicated
Solution Approach 1:
The patent transitions from a planar arrangement where all sensing patterns are on the same layer to a three-dimensional stacked arrangement where first sensing patterns are on a lower layer and second sensing patterns are on an upper layer. This vertical stacking eliminates the need for complex contact hole formation and additional masks, as patterns on the same layer can be directly coupled through simple conductive connections without requiring precise alignment through multiple masking steps.
2Ease of operation
If touch screen panel is positioned on display panel with light transmission and external light reflection, then the panel can function as a touch interface, but light reflectance difference is generated affecting image uniformity
Solution Approach 1:
The patent applies anti-reflective coatings with specific refractive indices (1.3-1.45) on the outer surface of the touch screen panel. This parameter change in the optical properties of the panel surface reduces light reflection through constructive interference, thereby minimizing light reflectance differences and improving image uniformity while preserving the touch functionality of the panel.
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
This design simplifies the fabrication process by reducing the number of masks needed and improves light reflectance uniformity, enhancing the overall performance and efficiency of the touch screen panel.
Implementation Method 1
an external light incident on the external surface of the touch screen panel is reflected. Therefore, in order to display a uniform image, it is desirable to prevent or reduce a difference in light reflectance from being generated from the touch screen panel
Implementation Method 2
the first insulating film and the second insulating film are composed of materials having different optical refractive indexes
Data Source
AI summary
A touch screen panel provided in an image display device. The touch screen panel includes: a transparent substrate; a plurality of first sensing patterns on the transparent substrate and coupled to each other along a first direction; a first insulating film on the first sensing patterns; a plurality of second sensing patterns on the first insulating film and coupled to each other along a second direction, the first and second sensing patterns being alternately arranged not to overlap with each other; and a second insulating film on the second sensing patterns, wherein the first insulating film and the second insulating film are composed of materials having different optical refractive indexes.