Foldable Display Touch Sensor Electrode Segmentation
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Solution Overview
Problem
Display devices with touch sensors experience electrical interference between driving electrodes and sensing electrodes when folded or unfolded, leading to deteriorated touch sensitivity.
Innovation Solution
The display device is designed with driving electrodes on one side of the folding axis driven by a first touch driver and the other side driven by a second touch driver, with metal lines connecting them to prevent interference and improve sensitivity, while maintaining a specific spacing and arrangement of sensing electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If driving electrodes and sensing electrodes are arranged on both sides of the folding axis in a foldable display device, then the touch sensing coverage is improved, but electrical interference occurs between the electrodes leading to deteriorated touch sensitivity
Solution Approach 1:
The touch sensing unit is divided into multiple independent groups, with each group containing driving electrodes and sensing electrodes that are spatially separated by the folding axis. This segmentation prevents electrical interference between adjacent electrodes while maintaining comprehensive touch sensing coverage across the foldable display surface.
Solution Approach 2:
The folding axis acts as an intermediary barrier that physically separates driving electrodes from sensing electrodes. This intermediate structure prevents direct electrical coupling between the electrode types, eliminating interference while allowing the touch sensing system to function across the entire display area.
2Measurement precision
If multiple driving electrodes and sensing electrodes are arranged in the foldable area, then the touch detection capability is improved, but electrical coupling between electrodes causes interference and reduces sensitivity
Solution Approach 1:
The electrode arrangement is segmented into distinct groups separated by the folding axis, with driving electrodes on one side and sensing electrodes on the other. This spatial segmentation enables precise touch detection through multiple electrode pairs while preventing harmful electrical coupling between adjacent electrodes of different types.
Solution Approach 2:
The electrode configuration employs asymmetric arrangement relative to the folding axis, creating unequal spacing and positioning that prevents symmetrical electrical coupling paths. This asymmetric design reduces interference while maintaining optimal touch detection precision across the foldable display area.
Data Source
AI summary
A display device includes: a first base member configured to be folded or unfolded along a folding axis and including a display area including a first display area disposed on one side of the folding axis, a second display area disposed on another side of the folding axis, and a third display area through which the folding axis passes; and a plurality of first sensing electrodes and a plurality of second sensing electrodes disposed in each of the first display area, the second display area, and the third display area on the first base member. Each of the plurality of first sensing electrodes and each of the plurality of second sensing electrodes are spaced apart from each other based on the folding axis interposed therebetween.