Touch Sensor Pressure Sensitivity Curved Edge Regions
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Solution Overview
Problem
Current touch sensors lack the ability to accurately sense touch pressure with high sensitivity, particularly at edge portions with curved shapes, limiting their functionality and user interaction capabilities.
Innovation Solution
A touch sensor design incorporating first and second pressure sensors with distinct structures and configurations, including different electrode thicknesses, distances, and overlapping areas, positioned in flat and curved touch regions on a display device, allowing for enhanced pressure detection sensitivity in both perpendicular and normal directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single pressure sensor structure is used across the entire touch sensor, then the device complexity is reduced, but the pressure detection sensitivity is insufficient particularly at curved edge portions
Solution Approach 1:
The patent applies different pressure sensor structures to different regions of the touch sensor. First pressure sensors with first electrode configurations are used in flat touch regions, while second pressure sensors with second electrode configurations are used in curved touch regions. This local differentiation optimizes pressure detection sensitivity for each specific region's geometric characteristics, resolving the contradiction between measurement precision and device complexity.
2Adaptability or versatility
If pressure sensors are added to curved edge regions, then the pressure detection capability is improved, but the device complexity increases
Solution Approach 1:
The touch sensor is segmented into multiple touch regions (flat regions and curved regions) with different pressure sensor types assigned to each segment. This segmentation allows the system to achieve enhanced adaptability and versatility in detecting touch inputs across various regions while managing device complexity through systematic regional differentiation.
3Measurement precision
If the pressure sensitive layer thickness is increased, then the pressure detection sensitivity is improved, but the touch sensor becomes less responsive to light touches
Solution Approach 1:
The patent implements different pressure sensitive layer thicknesses in different regions: thicker pressure sensitive layers in flat touch regions for enhanced pressure detection sensitivity, and thinner pressure sensitive layers in curved touch regions for improved responsiveness to light touches. This local quality differentiation resolves the contradiction between measurement precision and ease of operation.
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
The design improves pressure detection sensitivity, enabling more precise and varied user inputs by differentiating sensitivity based on touch direction and region geometry, enhancing user interaction with touch-enabled display devices.
Implementation Method 1
a pressure sensitive layer disposed between the first electrode and the second electrode
Implementation Method 2
Each of the first pressure sensors and the second pressure sensors may include: a first electrode; a second electrode disposed to be spaced apart from the first electrode; and a pressure sensitive layer disposed between the first electrode and the second electrode
Data Source
AI summary
There are provided a touch sensor and a display device including the touch sensor. A touch sensor includes: first pressure sensors disposed in a first touch region; and second pressure sensors disposed in a second touch region, wherein the second touch region is disposed at least one side of the first touch region and has a curved shape, wherein a first pressure detection sensitivity of the first pressure sensors in response to a touch input that is applied in a direction perpendicular to the first touch region is different from a second pressure detection sensitivity of the second pressure sensors in response to a touch input that is applied in a normal direction of the second touch region.