Touch Sensor Four-Edge Display Vertex Bending
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Solution Overview
Problem
Current touch sensors are unable to implement a smooth bend in the vertex region of a curved edge, limiting their capability to support four-edge displays in smartphones.
Innovation Solution
A touch sensor design featuring bent edges with cutout parts that widen towards the end and recessed cutouts, allowing for flexible bending and enabling a four-edge display configuration by forming a display area on all four edges of a smartphone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch sensor is designed with straight edges for traditional two-edge display, then the manufacturing is simple and structure is straightforward, but it cannot achieve smooth bending in vertex regions for four-edge display
Solution Approach 1:
The touch sensor is divided into multiple regions: a first region with a first edge, a second region with a second edge, and a third region with a third edge. Each region can be independently configured with different edge geometries, allowing the sensor to accommodate both straight edges for traditional displays and curved edges for four-edge displays.
Solution Approach 2:
The touch sensor employs asymmetric edge configurations where at least one edge has a different geometry from the others. This allows optimization of specific edges for bending applications while maintaining straight edges where needed, enabling smooth vertex region bending for four-edge display implementations.
2Area of stationary object
If the touch sensor implements four-edge display with curved edges, then the display area is maximized, but the vertex region cannot bend smoothly
Solution Approach 1:
The touch sensor incorporates curved edges with specific radius of curvature in the vertex regions. These curved geometries are designed to match the bending radius required for smooth folding, allowing the sensor to achieve both maximum display area and smooth bending performance in four-edge display configurations.
Solution Approach 2:
Different regions of the touch sensor are given different geometric properties: edge regions are designed with curved geometries optimized for bending, while central display regions maintain flat surfaces for optimal display performance. This local differentiation enables simultaneous achievement of large display area and smooth vertex bending.
3Ease of manufacture
If the touch sensor uses traditional straight-edge design, then the structure is simple and easy to manufacture, but it limits the smartphone to two-edge display configuration
Solution Approach 1:
The touch sensor is designed with a universal structure that can function in both traditional two-edge display configurations and modern four-edge display configurations. By incorporating flexible edge geometries and modular region design, the same sensor can be adapted to different display architectures without requiring complete redesign, thus maintaining manufacturing simplicity while enhancing adaptability.
Data Source
AI summary
A touch sensor comprises a sensing electrode, a bent part having edges bent rearward at four sides, and a cutout part that is joined after being cut at a vertex of the bent part.