Projection Display Unit With Detection Function For Power Saving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Compact projectors lack an efficient mechanism for power saving, as they often require manual operation of an ON/OFF switch or remote control, making it difficult to turn off the light source when the projector is not in use, especially when installed in inaccessible locations.
Innovation Solution
A projection display unit with a detection function that includes a projection display section and a detector. The detector emits detection light to detect objects on or near the projection surface and outputs a power-saving instruction signal to the projection display section, causing the display light source to turn off when no object is detected, thereby entering a power-saving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a proximity sensor is disposed in the main body of the projector, then the projector can detect objects, but it becomes difficult to determine whether the projector is in use and to turn off the light source for power saving
Solution Approach 1:
The detector is relocated from the main body to the projection surface, changing the spatial dimension of detection. This allows the system to directly monitor the projection surface area where objects would interact with the projected image, providing accurate detection while enabling automatic power saving through surface-level presence detection
Solution Approach 2:
The system uses the projection surface itself as the detection location, allowing the surface to 'self-monitor' for object presence. When no object is detected at the projection surface, the system automatically transitions to power-saving mode by turning off the light source, eliminating the need for manual intervention
2Adaptability or versatility
If the projector is disposed in an inaccessible place such as a wall or ceiling, then the projector can be installed in convenient locations, but the ON/OFF switch becomes hard to operate
Solution Approach 1:
The projector system automatically detects object presence at the projection surface and self-regulates its power state. When no object is detected, it automatically turns off the light source without requiring manual switch operation, enabling convenient installation in inaccessible locations while maintaining ease of operation through automation
Solution Approach 2:
The system continuously monitors the projection surface for object presence and uses this feedback to automatically control the light source. This closed-loop feedback mechanism eliminates the need for manual switching, allowing the projector to be installed in convenient locations regardless of switch accessibility
3Ease of operation
If a remote control is used to turn off the projector, then the projector can be controlled from a distance, but the operation becomes troublesome
Solution Approach 1:
The projector system automatically detects when no object is present at the projection surface and self-turns off the light source. This eliminates the need for remote control operation entirely, saving time by removing the manual step of reaching for and operating a remote control device
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
This solution allows for automatic power saving by turning off the display light source when the projector is not in use, reducing energy consumption without requiring manual operation of the projector's switch or remote control, even when installed in hard-to-reach locations.
Implementation Method 1
a detector (120) including a detection light source (121) that emits detection light (L2)
Data Source
AI summary
A projection display unit with a detection function includes a projection display section (110) and a detector (120). The projection display section (110) includes a display light source. The display light source emits light used as illumination light, and projects an image onto a projection surface with the illumination light. The detector (120) includes a detection light source that emits detection light. The detector (120) detects an object on or near the projection surface, and outputs a power-saving instruction signal to the projection display section (110) in accordance with a detection state of the object. The power-saving instruction signal instructs a transition to a power-saving mode. The projection display section (110) turns off the display light source in response to the power-saving instruction signal.