Optical Compensation Layer for Touch Panel Chromatic Aberration
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Solution Overview
Problem
Modern touch panels with etched sensing electrodes suffer from chromatic aberration due to differing light responses from etching and non-etching regions, leading to optical issues like color defects when observed.
Innovation Solution
Incorporating an optical compensation layer between the cover lens and the sensing electrode layer to match the optical properties, reconciling the hue of reflected light from etching and non-etching regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If an etched sensing electrode is used in the touch panel, then the touch panel achieves a slim and light TOL structure, but chromatic aberration and optical problems such as color defects appear
Solution Approach 1:
An optical compensation layer is introduced as an intermediary between the cover lens and the sensing electrode layer. This intermediate layer has optical properties designed to compensate for the chromatic aberration caused by the etched sensing electrode, thereby resolving the contradiction between achieving a slim TOL structure and eliminating optical defects
Solution Approach 2:
The optical compensation layer changes the optical parameters (refractive index, thickness) of the light path between the cover lens and the sensing electrode. By adjusting these parameters, the layer compensates for the chromatic aberration introduced by the etched electrode pattern while maintaining the slim structure
2Reliability
If the sensing electrode is etched to form patterns, then the touch sensing function is achieved, but the etching region and non-etching region respond differently to light causing optical problems
Solution Approach 1:
The optical compensation layer is designed with spatially varying optical properties that correspond to the etching patterns of the sensing electrode. The layer provides localized optical compensation across different regions (etched and non-etched areas) to ensure uniform optical response while maintaining the touch sensing function
Solution Approach 2:
The optical compensation layer acts as a mediator that uniformizes the optical response between etched and non-etched regions. It compensates for the differential light response caused by the etching pattern, thereby eliminating optical problems while preserving the touch sensing capability
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
Effectively reduces chromatic aberration, enhancing the transmittance of the visible region by adjusting the color tone of reflected light to resemble natural light, eliminating blue or yellow tendencies.
Implementation Method 1
an optical compensation layer receives incident light through the cover lens and the sensing electrode to reconcile the hue of the reflected light correspondingly formed from the etching region and the non-etching region
Data Source
AI summary
The present disclosure provides a touch panel, including: a cover lens, an optical compensation layer and a sensing electrode layer disposed between the cover lens and the optical compensation layer, wherein an etching region and a non-etching region are defined in the sensing electrode layer; an optical match is formed by the optical compensation layer with the sensing electrode layer, wherein the optical compensation layer receives incident light through the cover lens and the sensing electrode to reconcile the hue of the reflected light correspondingly formed from the etching region and the non-etching region. The present disclosure also provides a method for fabricating a touch panel.