Sensor Sheet Diffusion Layer to Hide Touch Panel Fine Lines
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Solution Overview
Problem
Conductive fine lines in touch sensor panels are visible during illumination, leading to reduced visibility and increased power consumption when attempting to hide them with thicker layers or increased light output.
Innovation Solution
A sensor sheet with a diffusion layer between the sensor electrode layer and the internal light source, which diffuses and randomizes the light direction, preventing the silhouette of the conductive fine lines from being seen and maintaining high illumination luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the layer thickness of the white print layer is increased to hide the conductive fine line, then the conductive fine line becomes less visible, but the illumination luminance of the display portion becomes low and visibility is reduced
Solution Approach 1:
A light diffusion layer is introduced as an intermediary between the internal light source and the sensor electrode layer. This diffusion layer scatters the light in multiple directions, preventing direct line-of-sight from the light source to the conductive fine lines, thereby hiding the lines without requiring increased print layer thickness that would reduce illumination luminance.
2Illumination intensity
If the output of the internal light source is increased to improve visibility, then the visibility of the display portion improves, but the power consumption greatly increases
Solution Approach 1:
The light diffusion layer acts as a mediator that optimizes light distribution. By scattering light effectively, it improves visibility without requiring increased light source output, thereby maintaining low power consumption while achieving good display visibility.
3Ease of manufacture
If silver ink printing is used to form the conductive fine line, then the manufacturing cost is reduced, but the conductive fine line becomes visible through the thin print layer when illuminated
Solution Approach 1:
The light diffusion layer serves as an intermediary that allows the use of cost-effective silver ink printing for conductive fine lines while preventing their visibility during illumination. The diffusion layer masks the lines optically without requiring changes to the printing process or material 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 provides uniform illumination and improved visibility of the display portion without the need for thickening the print layer, resulting in a high-quality, cost-effective touch panel suitable for dark environments.
Implementation Method 1
a diffusion layer provided between the sensor electrode layer and the internal light source, the light diffusion layer diffusing a light of the internal light source and transmitting the light to the sensor electrode layer
Data Source
AI summary
To provide a sensor panel and a sensor sheet, in which a conductive fine line and a silhouette of the conductive fine line is difficult to be seen through a display portion during illumination and in which the visibility of the display portion during illumination is good. A light diffusion layer is provided on the sensor sheet, the light diffusion layer diffusing a light of an internal light source L and transmitting the light to sensor electrodes.