Touch Sensing Unit Electrode Layout for Short Prevention
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Solution Overview
Problem
Display devices face challenges in preventing shorts between sensing electrodes and connection electrodes, which affect touch sensitivity and reliability, particularly due to the arrangement and position of electrodes in touch sensing units.
Innovation Solution
The design includes a touch sensing unit with a substrate featuring first and second sensing electrodes on the same layer, insulated from each other, and connection electrodes that electrically connect separated touch conductive patterns, with specific configurations to prevent overlap and ensure insulation, thereby reducing the risk of shorts and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection electrodes are positioned to electrically connect separated touch conductive patterns, then electrical connectivity is improved, but risk of short between connection electrode and sensing electrode increases
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked configuration. Connection electrodes and sensing electrodes are positioned on different layers separated by an insulating layer, allowing electrical connection in the vertical dimension while preventing short circuits through spatial separation. This multi-layer architecture enables both connectivity and insulation simultaneously.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the connection electrode and the sensing electrode. This intermediate layer physically separates the two conductive elements while allowing the connection electrode to maintain electrical connection with touch conductive patterns through contact holes that penetrate the insulating layer, thus preventing short circuits while preserving connectivity.
2Measurement precision
If sensing electrodes are arranged to increase touch sensitivity, then touch detection capability is improved, but likelihood of overlap with connection electrodes increases
Solution Approach 1:
The patent resolves the conflict between touch sensitivity and short prevention by utilizing the vertical dimension. Sensing electrodes are arranged in a two-dimensional grid pattern on one layer to maximize touch detection coverage, while connection electrodes are positioned on a different layer. The insulating layer between them ensures that the enhanced two-dimensional sensing arrangement does not lead to short circuits.
3Measurement precision
If touch conductive patterns are separated to reduce interference, then signal accuracy is improved, but electrical connectivity between patterns becomes more difficult
Solution Approach 1:
The patent segments the connection path into multiple components: contact holes through the insulating layer, connection electrodes on the second layer, and wiring patterns. This segmentation allows touch conductive patterns to remain separated on the first layer for signal accuracy, while the segmented connection structure provides flexible electrical connectivity between the separated patterns without requiring them to be in direct contact.
Data Source
AI summary
A display device is provided. A display device includes a display unit, and a touch sensing unit disposed on the display unit, wherein the touch sensing unit includes a substrate, a first sensing electrode disposed on the substrate, wherein the first sensing electrode includes a plurality of touch conductive patterns separated from each other, a second sensing electrode disposed on the same layer as the first sensing electrode and insulated from the first sensing electrode, and a connection electrode electrically connecting the touch conductive patterns to each other, wherein the connection electrode includes a first connection electrode overlapping the second sensing electrode and a second connection electrode not overlapping the second sensing electrode.