Stacked Touch Electrode Layout for Light-Defect-Resistant Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving a high degree of freedom in touch electrode arrangement and enhanced touch sensing capabilities while minimizing defects caused by light, particularly in electroluminescent displays.
Innovation Solution
The display device incorporates a substrate with a display area and non-display area, featuring a thin film transistor, encapsulation layer, and sensor electrodes formed in different layers with varying widths, along with a touch interlayer insulation layer to enhance touch sensing and reduce light defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor electrodes are arranged in multiple layers with different widths, then touch sensing capability is enhanced and design freedom is increased, but device complexity increases
Solution Approach 1:
The touch sensor is divided into multiple layers (first sensor electrode layer and second sensor electrode layer) with different electrode widths, allowing independent optimization of each layer for specific sensing functions while maintaining overall system complexity management
Solution Approach 2:
The patent introduces a vertical dimension by stacking sensor electrodes at different depths (first sensor electrode closer to substrate, second sensor electrode farther away), enabling three-dimensional touch sensing capabilities while preserving two-dimensional design flexibility
2Measurement precision
If multiple sensor electrode layers with varying widths are used, then touch sensing capability is enhanced, but manufacturing complexity increases
Solution Approach 1:
The touch sensing function is segmented across multiple electrode layers with different widths, allowing each layer to be optimized for specific sensing zones while simplifying the manufacturing process for each individual layer
Solution Approach 2:
Different regions of the sensor electrodes have different widths tailored to local sensing requirements, with wider electrodes in areas requiring higher sensitivity and narrower electrodes in other regions, optimizing both performance and manufacturability
3Object-affected harmful factors
If black matrix with varying widths is applied over sensor electrodes, then light defects are minimized, but device complexity increases
Solution Approach 1:
The black matrix is designed with varying widths at different locations, with wider portions over certain sensor electrodes and narrower portions over others, allowing localized optimization to minimize light defects in specific areas while maintaining overall design simplicity
Data Source
AI summary
A display device can include a substrate having a display area and a non-display area outside the display area, a thin film transistor on the substrate, a subpixel connected to the thin film transistor, an encapsulation layer disposed on the subpixel, a first sensor electrode disposed on the encapsulation layer, a touch interlayer insulation layer disposed on the first sensor electrode, and a second sensor electrode disposed on the touch interlayer insulation layer. The second sensor electrode is electrically connected to the first sensor electrode through a contact hole of the touch interlayer insulation layer.