Touch Input Device with Edge Sensors for Expanded Sensing Area
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Solution Overview
Problem
Conventional touch input devices are limited to two-dimensional touch interaction and have a restricted touch sensing area due to force sensors being attached to the bottom surface, which hinders the ability to sense touches outside a virtually connected border and complicates expansion on curved surfaces.
Innovation Solution
A touch input device design featuring a touch plate with an elastic member connected to sensors that can deform in multiple directions, allowing sensors to be placed inwardly from the edge, enabling accurate force measurement and expanding the touch sensing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If force sensors are attached to the bottom surface at the end edges of the touch panel, then the structure is simple and easy to manufacture, but the touch sensing area is narrowed and limited to inside a virtually connected border
Solution Approach 1:
The patent transitions from a conventional 2D touch sensing arrangement (sensors only at end edges) to a 3D configuration by positioning sensors on multiple surfaces (bottom surface and side surfaces) of the touch panel. This dimensional expansion allows the sensing area to extend beyond the previously limited border, enabling detection of touches across the entire panel surface including edge regions.
Solution Approach 2:
The touch panel is divided into multiple sensing zones with different sensor configurations. The bottom surface has sensors arranged in a first pattern, while side surfaces have sensors arranged in a second pattern. This segmentation allows each region to be optimized independently, expanding the overall sensing area while maintaining manageable complexity through modular sensor groups.
2Adaptability or versatility
If force sensors are attached to the end edges of the touch panel, then the manufacturing process is simplified, but it becomes difficult to expand the touch sensing area on curved surface structures
Solution Approach 1:
The patent employs flexible circuit boards to connect sensors to the control circuit, allowing the sensor assembly to adapt to curved and non-planar surfaces. The flexible connections enable the touch panel to be manufactured with various surface geometries (flat, curved, bent) without compromising sensor functionality, thus enhancing adaptability while maintaining ease of manufacture through standardized flexible interconnections.
3Area of stationary object
If sensors are placed at the end edges of the touch panel, then the device structure is compact, but the touch sensing area is restricted and cannot detect touches outside the border
Solution Approach 1:
The patent extends the sensing capability beyond the traditional edge-by-edge approach by utilizing side surfaces of the touch panel for sensor placement. This transforms the sensing geometry from a planar 2D arrangement to a three-dimensional configuration that wraps around the panel edges, effectively increasing the sensing area without proportionally increasing the panel's footprint.
4Adaptability or versatility
If conventional 2D touch sensing technology is used, then the device structure is simple, but the touch interaction is limited to two-dimensional coordinates only
Solution Approach 1:
The patent creates a multi-functional touch sensing system that can detect not only 2D touch coordinates but also 3D touch information such as force intensity, touch duration, and multi-touch patterns. The same sensor array serves multiple functions: basic position detection, pressure sensing, and gesture recognition, thereby enhancing touch interaction capability without requiring separate specialized sensors for each function.
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 enhances the touch sensing area and degree of freedom in design, allowing for accurate detection of touch coordinates and intensity across a broader surface, including curved structures, and supports both push and pull-type inputs.
Implementation Method 1
at least one elastic member connected to the second surface of the touch plate, and deformed in at least one of the first direction and the second direction when a touch is applied to the first surface of the touch plate
Implementation Method 2
The sensor may be a strain gauge measuring a force when it is subjected to bending in response to the deformation of the elastic member in the first direction or the second direction
Data Source
AI summary
A touch input device includes: a touch plate having a first surface facing in a first direction, and a second surface facing in a second direction opposing the first direction; at least one elastic member connected to the second surface of the touch plate, and deformed in at least one of the first direction and the second direction when a touch is applied to the first surface of the touch plate; and a plurality of sensors connected to the at least one elastic member and detecting when the elastic member is deformed to sense the touch. The plurality of sensors are disposed to be inwardly spaced apart from end edges of the touch plate, and output a first signal when a sensor among the plurality of sensors senses that one point of the touch plate is pulled in the first direction and a second signal when the one point of the touch plate is pushed in the second direction, and the touch plate has a plurality of touch areas divided by a plurality of imaginary lines connecting the plurality of sensors to each other virtually.