3D Touch Panel Pull Detection Using Capacitance Change
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Solution Overview
Problem
Existing input display devices with three-dimensional user interfaces struggle to accurately detect pulling operations on touch panels due to the distance between capacitance sensors and the finger, leading to increased complexity and potential touch mistakes, especially in situations like in-vehicle use where visibility is limited.
Innovation Solution
An input display device with a capacitive touch panel and a detection unit that utilizes a change in capacitance to determine pulling operations by detecting changes in distance from a finger touching a pulling portion, which is attached via an elastic member to the touch panel, allowing for accurate detection without adding more sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a cantilevered cover glass is used to imitate a pulling type switch, then the shape can be maintained, but the detection accuracy of pulling operations deteriorates due to the distance between the sensor and touch position
Solution Approach 1:
An elastic member is introduced as an intermediary between the three-dimensional operation portion and the touch panel. This elastic member transmits the pulling force from the operation portion to the touch panel, enabling accurate detection of pulling operations while maintaining the desired switch-like shape.
Solution Approach 2:
The patent replaces the need for additional mechanical sensors with a capacitance-based detection system. By detecting changes in capacitance caused by the elastic member's deformation during pulling operations, the system achieves accurate detection without complex mechanical sensor arrangements.
2Measurement precision
If a touch sensor is mounted on the back surface of the cantilevered operation portion, then pulling operations can be detected, but the device complexity increases and the structure becomes complicated
Solution Approach 1:
The touch panel serves multiple functions: it acts as both the display surface and the detection element for pulling operations. The capacitance sensor integrated in the touch panel detects both touch and pulling operations, eliminating the need for separate sensors on the operation portion.
Solution Approach 2:
The elastic member serves as a mediator that transmits mechanical deformation from the operation portion to the touch panel, where the capacitance sensor detects the resulting capacitance changes. This approach maintains structural simplicity while achieving accurate detection.
3Ease of operation
If the finger is lifted in a direction opposite to the sensor, then the pulling operation can be performed, but the capacitance detection becomes difficult and touch mistakes increase
Solution Approach 1:
The patent uses capacitance-based detection to sense the pulling operation indirectly through the elastic member's deformation, rather than requiring direct contact sensing. This substitution allows reliable detection even when the finger moves away from the sensor in the opposite direction.
Solution Approach 2:
The system provides tactile feedback through the elastic member's resistance during pulling, allowing the user to sense the operation status. Simultaneously, the capacitance sensor detects the pulling operation through the elastic member's deformation, ensuring reliable detection without direct finger-sensor contact.
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 solution enables precise detection of pulling operations with a simple structure, reducing touch mistakes and maintaining the configuration of a pulling type switch, even in situations where visibility is limited, such as during in-vehicle use.
Implementation Method 1
a detection unit configured to detect an operation on the touch panel, wherein the three-dimensional operation portion includes a pulling portion imitating a shape of a pulling type switch, and the detection unit determines whether or not there is a pulling operation by detecting a change in a capacitance in response to a change in a distance to the touch panel from a finger touching the pulling portion
Implementation Method 2
the operation portion is attached to be separable from the touch panel via an elastic member
Data Source
AI summary
An input display device includes a display configured to display an image, a capacitive touch panel configured to be attached onto the display and include at least one three-dimensional UI portion on a surface of the touch panel, and a detection unit configured to detect an operation on the touch panel. The three-dimensional UI portion includes a pulling portion imitating the shape of a pulling type switch, and the detection unit determines a pulling operation by detecting a change in a capacitance in response to a change in a distance from a finger touching the pulling portion to the touch panel.