Light Source Roll-Off Compensation via Pulsed Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Spatial light modulators face inefficiencies due to light sources producing varying luminous flux over time, particularly 'roll-off' phenomena where radiant energy is not uniformly produced, affecting optical power output and color performance.
Innovation Solution
A system utilizing multiple light sources of different wavelengths, with a controller modulating their frequency, period, or rate to compensate for roll-off, optimizing radiant energy flux by adjusting the duty cycle and drive conditions of each light source, such as increasing the frequency and reducing duration for light sources experiencing roll-off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a light source is turned on for a longer duration to increase luminous flux, then the total light output increases, but the radiant energy efficiency decreases due to roll-off
Solution Approach 1:
The patent applies periodic pulsed action to light sources, switching them on and off in controlled cycles. By operating light sources in pulsed mode rather than continuous operation, the system achieves higher radiant energy efficiency while maintaining required luminous flux levels, effectively resolving the roll-off problem through temporal modulation of light source activation
Solution Approach 2:
The system dynamically adjusts the duty cycle and pulse duration of light sources based on real-time performance requirements. By making the operation parameters variable rather than fixed, the system optimizes the balance between luminous flux output and radiant energy efficiency, adapting to different operating conditions to prevent roll-off effects
2Illumination intensity
If the duration of light source operation is extended to achieve desired luminous flux, then the light output is sufficient, but heating increases
Solution Approach 1:
By implementing periodic operation with controlled duty cycles, the system provides sufficient luminous flux during active periods while allowing cooling intervals during off periods. This temporal separation prevents cumulative heating effects that would occur with continuous operation, maintaining illumination requirements while controlling temperature rise
Solution Approach 2:
The system maintains continuous useful action through rapid pulsed operation that delivers required luminous flux in short intense bursts, followed by brief cooling periods. The high-frequency pulsing ensures that over time, the average luminous output meets requirements while the intermittent nature allows heat dissipation, preventing excessive temperature accumulation
3Ease of operation
If different light sources operate at the same frequency to simplify control, then the control system is simpler, but color performance deteriorates due to roll-off variations
Solution Approach 1:
The patent applies local quality by assigning individualized operating parameters to each light source based on its specific characteristics and roll-off behavior. Each light source is controlled with customized duty cycles and pulse durations tailored to its performance profile, ensuring optimal color performance while maintaining overall system control through a centralized controller that manages these individual variations
4Use of energy by moving object
If light sources are modulated to compensate for roll-off, then radiant energy efficiency improves, but system complexity increases
Solution Approach 1:
The system compensates for roll-off by dynamically changing operational parameters such as duty cycle, pulse duration, and frequency for each light source. A centralized controller manages these parameter adjustments, optimizing electrical to optical efficiency by adapting light source operation to their specific roll-off characteristics while maintaining coordinated control across all sources
Data Source
AI summary
A system comprises two or more light sources comprising a first light source and a second light source, each light source of the two or more light sources configured to provide light of a particular wavelength, wherein a first wavelength of a first light provided by the first light source differs from a second wavelength of a second light provided by the second light source, and wherein the first light has a first radiant energy that experiences roll-off. The system further comprises a controller configured to modulate an attribute of each light source to compensate for the roll-off, the modulation comprising modulating an attribute of the first light source, and the modulation further comprising modulating an attribute of the second light source, the modulation of the second attribute being different from the modulation of the first attribute.