Curved Touch Display Sensitivity Balancing Across Center and Edges
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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 incorporates a touch sensor unit with varying sensitivity adjustments, including higher sensitivity in the center region compared to edge regions, achieved through differences in touch electrode areas, distances, and voltage levels, ensuring uniform touch sensitivity across the curved surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel is curved to reduce image distortion and increase immersion, then image quality and user experience are improved, but touch sensing accuracy deteriorates due to varying distances between the touching object and the touch surface
Solution Approach 1:
The patent applies local quality by differentiating the touch sensor configuration between the center region and edge regions of the curved display panel. Specifically, the first touch electrodes in the center region have a first area, while the second touch electrodes in the edge regions have a second area that is larger than the first area. This local differentiation compensates for the varying distances caused by curvature, ensuring uniform touch sensing accuracy across the entire curved surface.
2Measurement precision
If the touch electrode area is increased in the center region to compensate for longer distance, then touch sensitivity at the center is improved, but device complexity increases due to non-uniform electrode configuration
Solution Approach 1:
The patent implements local quality by creating distinct touch electrode configurations for different regions. The center region uses first touch electrodes with a first area, while edge regions use second touch electrodes with a larger second area. This localized adaptation allows each region to be optimized for its specific distance characteristics, improving overall touch sensitivity uniformity while maintaining a systematic approach to the complexity.
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
Ensures accurate touch sensing with uniform sensitivity along the curved display panel, preventing errors in touch information processing regardless of distance variations, particularly in hovering touch modes.
Implementation Method 1
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 to determine whether a touch exists or not, a position of the touch, and the like
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.