Touch-Sensing Display Wiring Layout for Uniform Time Constants
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Solution Overview
Problem
In display devices with touch sensors, differences in time constants between sensor electrodes due to varying lengths of sensor wiring lines cause degradation in detection performance.
Innovation Solution
The display device is designed with a configuration where sensor electrodes are arranged in a matrix, with longer sensor wiring lines intersecting more contact points, reducing the difference in time constants between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor wiring lines are extended to connect distant sensor electrodes, then all sensor electrodes can be connected to the controller, but the difference in time constants between sensor electrodes increases due to varying line lengths
Solution Approach 1:
The sensor wiring lines are segmented into multiple sections with different numbers of contact points. Specifically, sensor wiring lines connected to sensor electrodes farther from the controller have more contact points than those connected to closer electrodes. This segmentation compensates for the varying line lengths by adjusting the number of contact points, thereby equalizing the time constants across all sensor electrodes and resolving the contradiction between connectivity and time constant uniformity.
2Area of stationary object
If sensor electrodes are arranged in a matrix covering the display area, then touch detection coverage is improved, but the variation in wiring line lengths increases causing detection performance degradation
Solution Approach 1:
The patent applies local quality by making the number of contact points vary according to the local position of each sensor electrode. Sensor electrodes located farther from the controller (in peripheral regions of the matrix) are connected via sensor wiring lines with more contact points, while closer electrodes have fewer contact points. This localized adjustment ensures that all sensor electrodes regardless of their position in the matrix have uniform time constants, thereby maintaining detection accuracy across the entire touch detection area.
Data Source
AI summary
According to one embodiment, a display device includes a first electrode, a second electrode, a first wiring electrically connected to the first electrode, a second wiring electrically connected to the second electrode, and a controller electrically connected to the first wiring and the second wiring, wherein the first electrode and the second electrode are located in a display area, the first electrode is connected to the first wiring in a position away from the controller than the second electrode, the second electrode is connected to the second wiring in a position closer to the controller than the first electrode, and a number of the first wiring being greater than a number of the second wiring.