Capacitive Cursor Projection for Mid-Air Touch Height Feedback
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Solution Overview
Problem
Existing detection systems, such as touch panels, fail to provide users with a clear visual indication of the height at which to perform operations like tapping or writing, leading to uncertainty in spatial recognition.
Innovation Solution
A detection system comprising a detection device with sensor electrodes and a display device, where a control device calculates spatial coordinates and controls the display to project a cursor at the detected object's position, adjusting the cursor's size and form based on the object's distance from the detection surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a touch panel integrates a detection device without visual feedback, then the detection function is simple and cost-effective, but the user cannot visually recognize the operation height or spatial position
Solution Approach 1:
The system displays a cursor on the display device that corresponds to the detected object position, providing visual feedback to the user about the spatial location and operation height. This feedback loop allows users to see where their input is registered and adjust their interaction accordingly, resolving the information loss without adding complex hardware.
Solution Approach 2:
The display device serves dual purposes: displaying content and providing spatial feedback for the detection system. By reusing the existing display hardware for feedback purposes, the system avoids adding separate visualization components, thus improving information availability without proportionally increasing device complexity.
2Loss of information
If the cursor size is fixed, then the display is simple, but the user cannot distinguish different operation heights or distances
Solution Approach 1:
The cursor size dynamically changes based on the detected object distance from the detection surface. As the object approaches or moves away, the cursor expands or contracts accordingly. This dynamic adjustment provides continuous visual information about distance without requiring complex additional hardware, as it utilizes the existing display capabilities with software-controlled variation.
3Measurement precision
If no visual indicator is provided, then the system is simple and fast, but the user experiences uncertainty in spatial recognition and alignment accuracy
Solution Approach 1:
The system displays the cursor at the expected detection position before the user completes their input action. This preliminary visual indication guides users on where to position their input, allowing them to align their action accurately before execution. The cursor serves as a preview or guide, enabling users to plan their interaction in advance and execute it precisely, thereby improving alignment accuracy without significantly increasing operation time.
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
Enables users to visually recognize the distance and amount of operation needed, enhancing spatial awareness and alignment accuracy by dynamically changing the cursor's size and form according to the object's proximity to the detection surface.
Implementation Method 1
a detection device including a plurality of sensor electrodes provided in a detection region, and a detection circuit configured to detect capacitance of each of the sensor electrodes
Data Source
AI summary
According to an aspect, a detection system includes: a detection device including a plurality of sensor electrodes provided in a detection region, and a detection circuit configured to detect capacitance of each of the sensor electrodes; a display device having a display region overlapping the detection region; and a control device configured to control the detection device and the display device. The detection device is configured to calculate spatial coordinates of an object to be detected. The control device is configured to control the display device so as to display a cursor at a position where the calculated spatial coordinates of the object to be detected are projected onto the display region.