Dynamic Color Control for Projector Light Source Power Modulation
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Solution Overview
Problem
Conventional digital projection systems waste energy and reduce the lifetime of illumination sources due to constant power usage, as they cannot quickly modulate light output to match varying brightness levels in content, leading to inefficient use of light and increased heat generation.
Innovation Solution
Implementing a dynamic color control management system that uses advanced signal processing or metadata to detect peak video pixel drive levels, reducing light source power only to the required levels, and adjusting spatial light modulators to maintain image brightness with lower average source power, utilizing modern solid-state illumination systems that can quickly respond to changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If constant power is supplied to the light source, then peak brightness levels are maintained, but energy is wasted and light source lifetime is reduced
Solution Approach 1:
The light source power is dynamically adjusted based on the actual brightness requirements of the content being projected. The system continuously monitors peak pixel drive levels and modulates the light source power accordingly, transitioning from constant power supply to variable power supply that matches content demands, thereby reducing energy waste while maintaining required peak brightness
Solution Approach 2:
The system uses feedback from analyzing the source content to determine peak brightness requirements, then adjusts the light source power control signal accordingly. This closed-loop control ensures the light source receives exactly the power needed for the current content, preventing both energy waste and potential brightness deficiencies
2Illumination intensity
If constant power is supplied to the light source, then peak brightness levels are maintained, but light source lifetime is reduced
Solution Approach 1:
The system dynamically varies the light source operating power based on content requirements rather than maintaining constant high power. By operating at lower average power levels while preserving peak brightness capability through rapid modulation, the system extends light source lifetime without compromising image quality
Solution Approach 2:
The system analyzes the source content in advance to determine peak brightness requirements before projection, allowing proactive adjustment of light source power levels. This preliminary analysis enables the system to prepare appropriate power levels, avoiding unnecessary high-power operation and extending light source life
3Illumination intensity
If dynamic iris is used to control light output, then on/off contrast is improved, but lamp power usage is not reduced
Solution Approach 1:
The invention extracts and removes the unnecessary intermediate light control stage (dynamic iris) and replaces it with direct light source modulation. By controlling the light source itself rather than blocking light downstream, the system achieves both contrast improvement and energy savings by preventing unnecessary light generation in the first place
Solution Approach 2:
The system introduces an intermediary control mechanism at the light source level that directly modulates illumination output based on content requirements. This intermediary power control signal acts between the power supply and light source, enabling precise energy management and eliminating the need for downstream light blocking mechanisms
4Loss of energy
If light source power is reduced, then energy efficiency is improved, but image brightness may be compromised
Solution Approach 1:
The system dynamically adjusts light source power in real-time based on actual content brightness requirements. By matching power supply to actual demand through rapid modulation capability, the system achieves high energy efficiency during low-brightness content while maintaining full brightness capability when needed, eliminating the trade-off between efficiency and brightness
Data Source
AI summary
A method and apparatus are disclosed that use one or more of advanced signal processing or auxiliary metadata to detect maximum video pixel drive levels required, in advance, for quickly reducing light source power levels to only supply what is absolutely required by the spatial light modulator for that time period. A spatial light modulator is controlled so as to compensate proportionally by increasing its throughput. Thus, the image brightness can be preserved at a lower average source power level resulting in increased lifetime of the light source and lower operating cost on a per-hour basis and/or projection at a desired brightness using a lower cost light source than prior art systems.