Projection System Indicator Detection with Dual Light Modes
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Solution Overview
Problem
Existing image projection systems cannot accurately detect the position of an indicator, such as a pen, in regions where obstacles are present, as they exclude areas influenced by obstacles, preventing valid operation.
Innovation Solution
A projection system with a first mode that detects the position of a first indicator by emitting and detecting first light, and a second mode that reduces the light amount of second light when the first indicator is in contact with the surface, allowing detection of the first indicator by reducing the second light's impact, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system uses reflected light detection to identify indicator positions, then it can detect positions on the operation surface, but detection accuracy decreases when obstacles are present in the region
Solution Approach 1:
The patent segments the detection system into two independent detection paths: one using light emitted from the indicator itself (first light detection) and another using reflected light from the indicator (second light detection). This segmentation allows the system to switch between detection methods depending on the presence of obstacles, thereby maintaining detection accuracy in both obstacle-free and obstacle-affected regions
Solution Approach 2:
The patent changes the detection parameter from solely relying on reflected light to using either emitted light or reflected light based on the detection scenario. By adjusting which light detection method is active, the system adapts to different environmental conditions (presence or absence of obstacles) and maintains optimal detection accuracy
2Reliability
If the system excludes regions influenced by obstacles from valid operation areas, then detection reliability is maintained, but the usable operation area is reduced
Solution Approach 1:
The patent implements a dynamic detection system that automatically selects between two detection modes based on real-time conditions. When obstacles are detected in a region, the system dynamically switches from reflected light detection to emitted light detection for that specific region, allowing the entire operation surface to remain valid while maintaining reliability
Solution Approach 2:
The indicator's emitted light serves as an intermediary that bypasses the obstacle interference problem. When reflected light detection is blocked by obstacles, the emitted light from the indicator itself provides an alternative detection path that is not affected by obstacles, thereby expanding the valid operation area while maintaining reliability
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 accurate detection of the first indicator's position even when in contact with the surface, preventing detection accuracy decreases and allowing operation in previously excluded regions.
Implementation Method 1
a first indicator configured to emit first light
Implementation Method 2
detecting reflected light of the second light reflected by the second indicator
Data Source
AI summary
An indicator detection method includes operating in a first mode and operating in a second mode. The first mode includes detecting a position of a first indicator on a operation surface by detecting first light emitted by the first indicator, emitting second light by a light emitting device, and detecting a position of a second indicator on the operation surface by detecting reflected light of the second light reflected by the second indicator. The second mode includes reducing a light amount of the second light when it is determined that the first indicator is in contact with the operation surface, and detecting the position of the first indicator on the operation surface by detecting the first light in a state where the light amount of the second light is reduced.