3D Touchscreen Feedback via Capacitive Distance Detection
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Solution Overview
Problem
Conventional touchscreens primarily detect 2D coordinates, lacking the ability to provide effective feedback on the distance and movement of objects, such as fingers, relative to the screen, which limits user interaction and convenience in 3D environments.
Innovation Solution
A 3D touchscreen system that includes a detecting unit to identify objects and a control unit to determine the region and provide feedback through sound, vibration, or visual cues based on the object's distance and movement, using technologies like capacitive, IR, and ultrasonic sensors to calculate three-dimensional coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional 2D touchscreen detection is used, then the device structure remains simple, but the ability to detect object distance and provide 3D feedback is lost
Solution Approach 1:
The patent extends conventional 2D touchscreen detection to 3D space by detecting the distance dimension (z-axis) in addition to the existing x-y coordinates. This is achieved by measuring capacitance changes that correspond to the distance between the object and the touchscreen surface, enabling three-dimensional coordinate detection without adding complex mechanical structures.
Solution Approach 2:
The patent replaces potential mechanical or optical 3D detection systems with an electrical field-based capacitance sensing approach. By utilizing the touchscreen's existing capacitive sensing capability to detect distance-related capacitance changes, the system achieves 3D detection without introducing complex mechanical moving parts or optical components.
2Loss of information
If 3D touchscreen detection is implemented, then object distance and movement recognition is improved, but the feedback mechanism complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the control unit receives capacitance values corresponding to object distance and movement, processes this information to determine region and movement type, and generates appropriate feedback signals. This closed-loop feedback system enables the touchscreen to provide contextual responses based on detected 3D object interactions.
Solution Approach 2:
The control unit serves multiple functions: it processes capacitance values for distance detection, determines object region, identifies movement type, and generates feedback signals. By consolidating these diverse functions into a single control unit, the patent avoids the need for separate dedicated circuits for each function, thereby reducing overall system complexity.
3Measurement precision
If multiple detection methods (capacitive, IR, ultrasonic) are used, then detection accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple detection approaches (capacitive sensing for distance, IR for presence detection, and ultrasonic for position verification) into a unified 3D detection system. By merging these different sensing modalities, the system achieves high-accuracy three-dimensional coordinate detection while sharing common processing infrastructure, thereby managing complexity through integration rather than separate independent systems.
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
Enhances user interaction by providing intuitive feedback on object distance and movement, improving recognition and convenience in 3D environments by using sound, vibration, and visual cues to indicate the object's position and movement relative to the touchscreen.
Implementation Method 1
using technologies like capacitive, IR, and ultrasonic sensors to calculate three-dimensional coordinates
Implementation Method 2
using technologies like capacitive, IR, and ultrasonic sensors to calculate three-dimensional coordinates
Implementation Method 3
using technologies like capacitive, IR, and ultrasonic sensors to calculate three-dimensional coordinates
Implementation Method 4
providing feedback through sound, vibration, or visual cues
Data Source
AI summary
Disclosed are an apparatus and a method for providing various feedbacks for a proximity based systems or a 3D touchscreen. According to the embodiments, a field (or a recognition region) above a 3D touchscreen may be divided into a predetermined number of levels of sub fields and a configuration of a feedback provider or a feedback changed according to the change of the level in which an object such as a finger may be changed.