Infrared Light Plane Adjustment for Position Detection
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Solution Overview
Problem
Existing projector systems that use infrared light for position detection struggle to recognize indicators like human hands or fingers due to difficulties in adjusting the plane of infrared light projection parallel to the display surface, leading to inaccurate position detection.
Innovation Solution
A method and system that utilize a rotatable projection device with dual axes of rotation to adjust the infrared light projection, ensuring the plane of infrared light progression is orthogonal to the display surface, and include an imaging unit to capture and determine the position of indicators based on captured images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared light is projected to pass over the displayed image for position detection, then position detection capability is improved, but adjustment complexity increases due to difficulty in setting the infrared light plane parallel to the display surface
Solution Approach 1:
A parallel indicator display unit is introduced as an intermediary device that visually indicates the infrared light projection plane. This mediator allows users to easily adjust the infrared light plane parallel to the display surface by referencing the visual indicator, thereby resolving the contradiction between achieving accurate position detection and maintaining ease of adjustment.
Solution Approach 2:
The parallel indicator display unit utilizes visual indicators (such as colored lines or patterns) to represent the infrared light plane orientation. By changing or displaying specific visual patterns that indicate parallel alignment, users can easily determine when the infrared light plane is correctly positioned, eliminating the difficulty of adjustment while maintaining detection accuracy.
2Reliability
If electronic stylus is used for indicating portions of displayed image, then position detection reliability is improved, but system versatility deteriorates because other indicators like human hand or pointer cannot be recognized
Solution Approach 1:
The position detection system is designed to detect various types of indicators including electronic styluses, human hands, fingers, and pointers by detecting infrared light reflection or emission. This multi-functional detection capability allows the system to work with diverse indicators while maintaining reliable position detection, thereby achieving both reliability and versatility.
Solution Approach 2:
The system automatically adapts to different indicator types without requiring manual configuration or switching modes. The position detection means automatically detects and processes signals from various indicators (electronic stylus, hand, finger, pointer) using the same infrared light projection and detection mechanism, making the system self-adapting and universally applicable.
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 easy adjustment of the infrared light plane parallel to the display surface, improving the accuracy of indicator position detection and allowing recognition of indicators without the need for electronic styluses.
Implementation Method 1
projects infrared light L1 such that infrared light L1 passes over displayed image 4
Implementation Method 2
an image is captured in a state in which the indicator that is pointing to a portion of the image on the displayed image is irradiated by the infrared light
Data Source
AI summary
An adjustment method for adjusting the direction of infrared light projected so that infrared light to pass over a displayed image from a projection device that is rotatable with orthogonal first and second axes as axes of rotation, the method including: arranging the projection device such that the plane containing the first axis and a line perpendicular to the upper edge or lower edge of the displayed image is orthogonal to the plane in which the displayed image is displayed; displaying a first image representing a first target on the line; and rotating the projection device with the second axis as the axis of rotation such that the irradiation position of the infrared light upon an indicator in the first image, in which is displayed a captured image, coincides with the position of the first target on the first image.