Curved Touch Sensor Layout for Uniform Display Edge Sensitivity
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Solution Overview
Problem
Curved display devices with touch sensors experience varying touch sensitivity due to differences in distance between the touching object and the touch surface, particularly at the center where the distance is longest, leading to inaccurate touch sensing in hovering touch modes.
Innovation Solution
The display device includes a touch sensor unit with a curved touch surface, where the touch sensitivity in the center region is higher than the edge regions, achieved by varying the area, distance, and voltage of touch electrodes, and using separate touch drivers for center and edge regions to ensure uniform touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a curved display device uses a touch sensor with uniform structure across the surface, then the device structure is simple, but the touch sensitivity varies significantly at different positions (center vs edge)
Solution Approach 1:
The patent applies local quality by making the touch electrode area and driving voltage position-dependent. The touch electrode area is enlarged at the center region and reduced at the edge regions, while the driving voltage is increased at the center and decreased at the edges. This compensates for the varying distance from the touching object to the touch surface, achieving uniform touch sensitivity across the curved display panel.
2Measurement precision
If the touch electrode area is enlarged at the center region, then the touch sensitivity at the center improves, but the overall device complexity increases due to non-uniform structure
Solution Approach 1:
The patent changes the parameters of the touch electrode (area and driving voltage) according to the position on the curved surface. By varying the electrode area and voltage parameters across different regions, the system compensates for the geometric differences in distance and achieves uniform touch response without requiring complex additional hardware components.
3Measurement precision
If separate touch drivers are used for center and edge regions, then the touch sensitivity uniformity is achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the touch sensor into multiple regions (center region and edge regions) with different touch electrode configurations and driving parameters. This segmentation allows each region to be optimized independently for its specific geometric characteristics, achieving uniform touch sensitivity while maintaining a relatively simple overall structure that can be manufactured using standard processes.
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 design allows for accurate touch sensing with uniform sensitivity along the curved display panel, regardless of the distance between the touching object and the touch surface, preventing errors in touch information processing.
Implementation Method 1
The touch electrode may form another touch electrode and a sensing capacitor (mutual-capacitor type), and form a sensing capacitor together with an external object (self-capacitor type). When a conductor such as a finger approaches or touches the touch sensor, a change is generated in the capacitance and/or the amount of charge in the sensing capacitor
Data Source
AI summary
A display device including a touch sensor and a driving method thereof, and more particularly, a curved display device including a touch sensor and a driving method thereof, are presented. The display device includes: a touch sensor unit including a plurality of touch sensors; and at least one touch surface curved to along a first direction, wherein the touch surface includes a center region and edge regions positioned at both sides of the center region along the first direction, and wherein a sensitivity of the touch sensor in the center region is higher than a sensitivity of the touch sensors in the edge regions.