Projector Human Detection Mode Switching
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Solution Overview
Problem
Conventional projectors lack the ability to automatically switch between content projection mode and illumination mode based on the presence of humans in specific regions, leading to inefficient energy use and unnecessary content projection when no one is present to view the image.
Innovation Solution
A projector with a human detection section and a mode switching section that adjusts the operation mode to either content mode or illumination mode depending on the presence of humans in defined regions, stopping light projection when no humans are detected in areas where the image can be viewed or used as illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the projector continuously projects content, then the content projection function is maintained, but energy is wasted when no humans are present to view the image
Solution Approach 1:
The human detection section performs preliminary detection of human presence in the viewing area before the projector starts projecting content. This preliminary action prevents unnecessary energy consumption by avoiding content projection when no humans are present, while ensuring content is ready to be projected immediately when humans arrive.
Solution Approach 2:
The projector continuously monitors the viewing area for human presence and adjusts its operation accordingly. When humans are detected, the projector switches to content projection mode; when no humans are detected, it switches to illumination mode or stops projection. This feedback mechanism resolves the contradiction by dynamically adjusting energy consumption based on actual viewing needs.
2Loss of energy
If the projector switches to illumination mode when no humans are detected, then energy is saved, but the transition between modes adds system complexity
Solution Approach 1:
The projector is designed with multi-functionality, capable of operating in both content projection mode and illumination mode using the same projection section. This universal design allows the single device to perform multiple functions based on human presence detection, saving energy while avoiding the need for separate dedicated illumination devices.
Solution Approach 2:
The projector implements dynamic mode switching between content projection and illumination based on real-time human detection results. The operation mode is not fixed but adapts dynamically to environmental conditions, allowing the system to optimize energy consumption while maintaining operational simplicity through automated control.
3Loss of energy
If the projector projects content only when humans are detected in the viewing area, then unnecessary projection is prevented, but detection accuracy requirements increase
Solution Approach 1:
The viewing area is divided into multiple detection zones with different importance levels. The human detection section prioritizes detection accuracy for zones closer to the projection screen where content viewing is most likely, while using less stringent detection for peripheral areas. This segmented approach reduces overall detection complexity while maintaining effectiveness.
Solution Approach 2:
The detection system applies different detection thresholds and sensitivity levels to different regions of the viewing area. Areas where content viewing is most probable have higher detection sensitivity, while peripheral areas use lower thresholds. This local quality differentiation optimizes detection accuracy where needed while reducing overall system complexity.
Data Source
AI summary
A projector includes a projection section adapted to project light, a human detection section adapted to detect a human existing in a predetermined region, and a mode switching section adapted to switch an operation mode to one of a content mode for projecting light of an image related to a content by the projection section, and an illumination mode for projecting light for illumination by the projection section in accordance with a detection result of the human detection section.