Light Source Controller for Projector Power Reduction
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Solution Overview
Problem
Image display apparatuses, such as projectors, often experience wasteful power consumption due to images being projected and displayed without significant changes, leading to unnecessary high luminous output.
Innovation Solution
A light source control apparatus with an image change determination unit and a light source controller that reduces the luminous output of the light source at a predetermined rate when no change or no signal in the image signal is detected, thereby conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the light source maintains high luminous output continuously, then the image display quality is preserved, but the power consumption increases wastefully when images are not changing
Solution Approach 1:
The light source controller dynamically adjusts the luminous output based on real-time detection of image signal changes. When no change is detected, the output is reduced at a predetermined decreasing rate; when change is detected, the output is restored to initial level. This dynamic adjustment resolves the contradiction by making luminous output adaptive to actual display needs.
Solution Approach 2:
The system implements a feedback mechanism where the light source controller continuously monitors image signal changes and adjusts luminous output accordingly. The controller receives feedback about image stability and modulates the light source power consumption based on this feedback, reducing power when images are static while maintaining quality when images are active.
2Loss of energy
If the luminous output is reduced to save power, then energy consumption decreases, but the image brightness and quality may deteriorate
Solution Approach 1:
The system dynamically modulates luminous output based on image activity rather than maintaining a fixed reduced level. By reducing output only when images are static and restoring when images change, the system achieves energy saving without permanent degradation of image brightness quality.
Solution Approach 2:
The light source controller periodically monitors image signals and applies periodic adjustment cycles of luminous output. This periodic action allows the system to save energy during static periods while maintaining full brightness during active display periods, balancing energy saving with quality preservation.
3Use of energy by moving object
If the light source is turned off completely when not in use, then power consumption is minimized, but the response time to restore image display increases
Solution Approach 1:
Instead of completely turning off the light source, the system applies partial action by reducing luminous output to a lower level rather than zero. This partial reduction achieves significant power savings while maintaining the light source in a ready state that can quickly restore to full output when needed, thus preserving fast response time.
Solution Approach 2:
The system prepares for potential image changes by maintaining the light source in a reduced-but-active state rather than completely off. This preliminary action keeps the system ready to respond immediately when image signals change, avoiding the delay that would occur if the source had to be fully reinitialized from an off state.
Data Source
AI summary
There is provided a light source control apparatus including an image change determination unit that determines presence or absence of at least one of a change of an image signal and the image signal, and a light source controller that reduces luminous output of a light source at a predetermined decreasing rate when the image change determination unit determines at least one of no change of the image signal and absence of the image signal.