Touch Sensing Unit for Curved Displays Using Multi-Layer Electrodes
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Solution Overview
Problem
Touch sensing units in display devices struggle to detect inputs on round portions with predetermined curvature, as existing designs often lead to short circuits and reduced sensitivity due to the intersection of driving and sensing lines.
Innovation Solution
The touch sensing unit incorporates first and second touch electrodes with distinct planar shapes in a touch sensor area, featuring driving and sensing lines that intersect, each comprising multiple touch signal layers, and connection electrodes to prevent short circuits, while ensuring high sensitivity by optimizing the layout and signal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If driving lines and sensing lines are arranged to intersect in the round portion, then touch sensor coverage is improved, but short circuits occur between lines
Solution Approach 1:
The patent introduces a third dimension by stacking multiple touch signal layers (first touch signal layer and second touch signal layer) vertically. Driving lines and sensing lines are arranged to intersect in the planar view, but they are separated in the vertical dimension by placing different signal layers at different heights, preventing short circuits while maintaining intersection coverage.
Solution Approach 2:
The touch signal transmission is segmented into multiple separate layers. The first touch signal layer carries signals for some lines while the second touch signal layer carries signals for other lines. This segmentation allows driving and sensing lines to cross without interfering with each other electrically, as they are isolated by the insulating layer between signal layers.
2Measurement precision
If driving lines and sensing lines intersect, then touch detection sensitivity is improved, but signal interference increases
Solution Approach 1:
By moving the separation from the planar dimension to the vertical dimension through multi-layer stacking, the patent allows lines to intersect in the x-y plane (maintaining detection sensitivity) while preventing electrical interference through z-dimension separation using insulating layers between signal layers.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the first touch signal layer and the second touch signal layer. This intermediary prevents direct electrical contact and signal interference between driving lines and sensing lines that intersect in the planar view, while still allowing the intersection to function for touch detection purposes.
3Measurement precision
If touch electrodes are shaped to match the round portion curvature, then detection accuracy on curved surfaces is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies different planar shapes to touch electrodes in different regions. Touch electrodes in the round portion have a different planar shape (adapted to curvature) compared to those in flat areas. This local differentiation allows accurate detection on curved surfaces while using standard manufacturing processes for the overall structure.
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
This configuration allows for effective detection of touch inputs on curved surfaces without short circuits, enhancing sensitivity by increasing the speed of mutual capacitance charging without lowering signal frequency.
Implementation Method 1
enhancing sensitivity by increasing the speed of mutual capacitance charging without lowering signal frequency
Data Source
AI summary
A touch sensing unit includes first touch electrodes and second touch electrodes disposed on in a touch sensor area which includes a round portion having a curvature. A driving line is connected to a first touch electrode among the first touch electrodes are disposed in the round portion of the touch sensor area. A sensing line is connected to a second touch electrode among the second touch electrodes disposed in the round portion of the touch sensor area. The driving line and the sensing line intersect each other.