Position Detection Using Light Pulse Timing
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Solution Overview
Problem
Existing position detecting systems require a calibration process for the indicating device, which delays user interaction as they cannot be used until the calibration is complete, even after the installation of the position detecting system.
Innovation Solution
A position detecting system that uses an indicating device with a sensor to receive light pulses and transmit timing signals, combined with multiple light sources emitting pulses at unique timings to areas on the screen, allowing the control unit to detect the indicating device's position without a special screen or calibration process, enabling immediate interactive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration process is performed for the indicating device, then the position detecting system can display images according to the position of the indicating device, but the user cannot use the position detecting system until the calibration process is completed
Solution Approach 1:
The system performs preliminary actions by having multiple light sources continuously emit light pulses at unique timings before any indication occurs. The sensor pre-receives these pulses and the control unit continuously calculates position information based on the timing differences, so that position detection is already ready when the user needs to interact with the screen.
Solution Approach 2:
The system uses the existing light sources from the image display device itself to generate the light pulses for position detection, rather than requiring separate calibration equipment or processes. The sensor on the indicating device automatically receives these pulses and transmits timing information back, enabling the system to self-calibrate and operate without external calibration procedures.
2Measurement precision
If a special screen is used for position detection, then the position of the indicating device can be detected accurately, but the system requires a special screen which increases device complexity and cost
Solution Approach 1:
The light sources in the image display device serve multiple functions: they display images and simultaneously emit light pulses for position detection. The sensor on the indicating device also serves dual purposes by detecting both the displayed image content and the timing of light pulses for position calculation. This eliminates the need for separate special screens or dedicated detection hardware.
Solution Approach 2:
The light pulses act as an intermediary carrier that conveys timing information from the light sources to the sensor without interfering with the normal image display function. By encoding position information in the timing of light pulses rather than requiring special screen properties, the system achieves accurate position detection using ordinary display screens.
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 display of images according to the position of the indicating device without the need for a special screen or calibration, allowing for immediate user interaction by detecting the device's position based on light pulse timing, thereby reducing setup time and enhancing usability.
Implementation Method 1
a sensor that receives a light pulse and detects timing of the light pulse
Data Source
AI summary
A position detecting system includes an indicating device including a photodiode that detects timing of a light pulse and a transmission unit that transmits a signal representing the timing, a plurality of light sources that emit light pulses to areas acquired by dividing a screen into a plurality of parts at timings unique to the light sources, a reception unit that receives the signal representing the timing, and a control unit that detects a position of the indicating device based on the signal representing the timing.