Angled Light Gesture Sensing Module for Contactless Direction Detection
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Solution Overview
Problem
Current gesture sensing technologies require users to touch the screen to operate mobile devices, limiting flexibility and accuracy in directional operations.
Innovation Solution
A gesture sensing module comprising at least one light emitting unit and one light sensor, where the light's central optical axis forms an angle with the substrate's normal vector, allowing the control circuit to determine the target's traveling direction based on reflection light signals, enabling operation without screen contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light emitting unit emits light with central optical axis forming an angle with the substrate normal vector, then the measurement precision of traveling direction is improved, but the device complexity increases due to angular alignment requirements
Solution Approach 1:
The patent changes the emission angle parameter of the light source from perpendicular (normal vector) to inclined (forming an angle with normal vector). This parameter change enables the light to illuminate different areas of the sensing region at different angles, allowing the system to detect traveling direction by analyzing which areas are illuminated and when. The control circuit determines direction based on the temporal-spatial pattern of light reflection, achieving precise directional detection without complex mechanical alignment mechanisms.
2Ease of operation
If multiple light sources and light sensors are disposed to implement gesture sensing without screen contact, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent makes the light emitting unit and light sensor serve multiple functions: they can detect various gestures (swiping, tapping, scrolling) and determine traveling direction (left-right, top-bottom) using the same basic components. The system universally handles different types of hand gestures by analyzing the temporal-spatial patterns of light reflection, eliminating the need for separate specialized sensors for each gesture type and reducing overall system complexity.
Solution Approach 2:
The patent replaces the traditional mechanical touch screen with an optical sensing system. Instead of detecting physical contact through electrical signals, the system uses light emission and reflection to detect hand gestures. The control circuit processes optical signals to determine gesture type and direction, substituting mechanical detection with optical field interaction, thereby enabling contactless operation while maintaining operational simplicity.
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
The module increases operational flexibility by sensing directional gestures without screen contact, reducing computational complexity and enhancing user interaction with electronic devices.
Implementation Method 1
The light emitting unit provides a light to irradiate a sensing area, wherein a central optical axis of the light forms an angle with a normal vector of the substrate
Implementation Method 2
The light sensor senses a reflection light which a target in the sensing area reflects the light, and generates a sensing signal according to the reflection light
Data Source
AI summary
An exemplary embodiment of the present disclosure illustrates a gesture sensing module disposed on a substrate. The gesture sensing module includes at least one light emitting unit, at least one light sensor, and a control circuit. The light emitting unit provides a light to illuminate a sensing area, wherein a central optical axis of the light forms an angle with a normal vector of the substrate, and the angle is not equal to 0. The light sensor senses a reflection light which a target in the sensing area reflects the light, and generate a sensing signal according to the reflection light. The control circuit coupled to the light sensor and the light emitting unit determines a traveling direction of the target according to the sensing signal.