Grating Sensor Array for 3D Touch Coordinate Detection
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Solution Overview
Problem
Current touch display devices can only determine the coordinate of a touch point on a two-dimensional plane, limiting the ability to achieve three-dimensional touch control.
Innovation Solution
A sensor system comprising a grating and a sensor array, where the grating allows light to pass through and reach photosensitive sensor units, enabling the determination of coordinates in a three-dimensional space by calculating distance and position based on light transmission gaps and the position of photosensitive sensor units that receive light from an object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional two-dimensional touch sensor is used, then the device structure is simple, but only two-dimensional touch coordinates can be determined without three-dimensional space measurement capability
Solution Approach 1:
The patent introduces a grating structure with light transmission gaps that creates optical path differences based on the distance of the touch object from the sensor surface. By measuring the position of light spots on the sensor array and calculating the optical path difference, the system determines the Z-coordinate (distance) in addition to the X and Y coordinates, thereby achieving three-dimensional touch measurement capability
Solution Approach 2:
The patent introduces light as an intermediary medium between the touch object and the sensor array. Light passes through the grating's light transmission gaps and carries information about the touch object's position and distance, enabling the sensor to measure three-dimensional coordinates by detecting the position and intensity distribution of light spots on the photosensitive sensor units
2Adaptability or versatility
If a grating structure with light transmission gaps is introduced to enable three-dimensional measurement, then three-dimensional touch control is achieved, but the device structure becomes more complex
Solution Approach 1:
The sensor array serves multiple functions: it detects both the X and Y coordinates of touch points (spatial position) and the Z coordinate (distance) through optical path difference measurement. The grating structure with light transmission gaps also serves dual purposes as both a structural element and a measurement reference, enabling the system to perform multiple measurement tasks with a single integrated structure
Solution Approach 2:
The grating structure introduces an optical dimension by creating interference patterns and light spot position variations that encode distance information. This allows the two-dimensional sensor array to capture three-dimensional spatial information by measuring the distribution and position of light spots, thereby achieving Z-axis measurement capability without adding a separate depth sensing subsystem
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 the determination of coordinates in a three-dimensional space, allowing for the realization of three-dimensional touch control in display devices.
Implementation Method 1
light can passing through a light transmission gap of the grating reaches the plurality of photosensitive sensor units
Implementation Method 2
a plurality of photosensitive sensor units and light can passing through a light transmission gap of the grating reaches the plurality of photosensitive sensor units
Data Source
AI summary
The present application provides a sensor comprising a grating and a sensor array sequentially disposed in a thickness direction of the sensor, wherein the sensor array comprises a plurality of photosensitive sensor units, and light passing through a light transmission gap of the grating reaches the plurality of photosensitive sensor units. The present application further provides a display device comprising the sensor. The sensor may detect three-dimensional coordinates of an object so that the display device can realize three-dimensional touch control.