Position Detection Device Using Wavelength-Specific Optical Filters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing position detection systems for electronic pens on display screens are complex and struggle to accurately distinguish between multiple pens emitting different wavelengths of light, leading to difficulties in reliable operation position detection.
Innovation Solution
A position detection device and method using an imaging section with a sensor that outputs detection values for first colored light, second colored light, and third colored light, where the sensor has distinct sensitivity characteristics for different wavelengths, allowing the detection of first and second positions of pointing members based on imaging data, and an optical filter that cuts light in specific wavelength bands to enhance differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical filter wheel with multiple optical filters is used to detect multiple electronic pens, then the ability to distinguish between multiple pens is improved, but the device complexity increases due to the rotation mechanism and multiple filters
Solution Approach 1:
The patent divides the wavelength detection into separate channels using multiple optical filters (first optical filter for first wavelength, second optical filter for second wavelength) that are stationary and simultaneously present on the image sensor, eliminating the need for a rotating filter wheel while maintaining the ability to distinguish multiple pens by their emitted wavelengths
Solution Approach 2:
The patent combines multiple wavelength detections into a single image capture by using multiple optical filters simultaneously on the image sensor, allowing detection of multiple electronic pens with different wavelengths in one go without the mechanical complexity of rotating filters
2Measurement precision
If multiple optical filters are used to detect different wavelengths, then the detection accuracy of multiple pointing members is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the detection function by assigning specific optical filters to detect specific wavelengths (first optical filter for first wavelength, second optical filter for second wavelength), making the manufacturing process more straightforward compared to rotating mechanisms while maintaining accurate differentiation of multiple pointing members
3Device complexity
If a simple image sensor is used without multiple optical filters, then the device complexity is reduced, but the ability to distinguish between multiple pens emitting different wavelengths deteriorates
Solution Approach 1:
The patent merges multiple wavelength detection capabilities into a single image sensor system by simultaneously providing multiple optical filters on the sensor, enabling the simple image sensor to distinguish between multiple pens emitting different wavelengths without requiring complex rotating mechanisms
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 detection of multiple pointing devices' positions with a simple configuration, effectively distinguishing between them even in the presence of outside light, and ensures high accuracy by using distinct color images formed from different wavelength light emissions.
Implementation Method 1
a sensor configured to output detection values of first colored light, second colored light, and third colored light to detect first infrared light and light with a first wavelength included in the first light and second infrared light and light with a second wavelength different from the first wavelength included in the second light with the sensor
Implementation Method 2
the imaging section includes an optical filter configured to cut light in at least a part of a wavelength band between a wavelength of the first infrared light and the first wavelength
Data Source
AI summary
A projector includes an imaging section for generating imaging data obtained by taking an image of first light emitted by a first pointing member, second light emitted by a second pointing member, and a target range, and a position detection section for detecting a first position and a second position with respect to the target range based on the imaging data so as to be distinguished from each other, and the imaging section includes a sensor for outputting detection values of first colored light, second colored light, and third colored light to detect first infrared light and light with a first wavelength included in the first light, and second infrared light and light with a second wavelength different from the first wavelength included in the second light with the sensor.