Capacitive Touch Panel Slot Alignment for Uniform Light Transmittance
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Solution Overview
Problem
In-Cell capacitive touch panels face issues with non-uniform light transmittance due to the presence of transparent conductive layers, which affects the display quality, especially noticeable in regions with different color resistors (R, G, B) as light wavelengths vary across these areas.
Innovation Solution
The capacitive touch panel design incorporates a transparent conductive layer with strategically placed slots that align with color units of the same color in the light permeation direction, ensuring uniform light transmittance by overlapping slots with specific color resistors, thereby improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conductive layer is used in the In-Cell touch panel, then electrical conductivity and touch sensitivity are improved, but light transmittance uniformity deteriorates due to the presence of the layer causing visible slots and color variations
Solution Approach 1:
The patent applies local quality by making the transparent conductive layer's optical properties position-dependent. Different regions of the layer have different light transmittance characteristics matched to the underlying color resistors (R, G, B areas have different transmittance values), ensuring uniform overall appearance while maintaining touch functionality throughout the panel
2Reliability
If the transparent conductive layer is made continuous to ensure electrical connectivity, then electrical conductivity is improved, but manufacturing complexity increases due to the need for precise slot positioning and light transmittance control
Solution Approach 1:
The patent employs parameter changes by adjusting the light transmittance parameter of the transparent conductive layer across different spatial locations. The layer's transmittance is varied to compensate for the underlying color resistor variations, achieving uniform display appearance while maintaining electrical connectivity through a continuous structure with controlled optical properties
Data Source
AI summary
A capacitive touch panel is disclosed. The touch panel includes a substrate, and a black matrix formed on the substrate, where the black matrix includes a plurality of light-permeable regions. The touch panel also includes a plurality of color units each aligned with one of the light-permeable regions of the black matrix in a light permeation direction, where each of the color units includes a color resistor of one of a plurality of colors, and at least one transparent conductive layer includes a plurality of slots, where the slots of the transparent conductive layer are aligned with the color units of the same color in the light permeation direction.