Light Source System With Overlapping Time-Interval Emission
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Solution Overview
Problem
Existing light source systems struggle to simultaneously achieve color gamut change and brightness enhancement, particularly in projection equipment, where the color purity of combined light beams is compromised.
Innovation Solution
A light source system comprising two light emitters that emit colored light simultaneously in specific time intervals, with one color band dominating the combined light beam, resulting in lower color purity and increased brightness, while also addressing the speckle problem of laser diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two light emitters are combined to emit colored light simultaneously, then brightness is enhanced, but color purity deteriorates
Solution Approach 1:
The patent employs time-sequential emission where the first light emitter operates during a first time interval and the second light emitter operates during a second time interval, with these intervals overlapping to create a combined light beam. This periodic, time-divided approach allows both light sources to contribute to brightness while maintaining controlled color characteristics through temporal separation rather than simultaneous mixing.
Solution Approach 2:
The system dynamically adjusts the timing and duration of emission intervals for each light emitter. By making the emission timing flexible and adjustable, the system can optimize the balance between brightness enhancement and color purity maintenance according to different operational requirements, allowing adaptation between these two conflicting parameters.
2Manufacturing precision
If time-sequential emission is used to maintain color purity, then brightness enhancement is reduced
Solution Approach 1:
The patent merges the emission intervals of two different light emitters in the time domain, creating an overlapping period where both emit light. This combination allows the system to achieve brightness enhancement comparable to simultaneous emission while maintaining the color control benefits of time-sequential operation during non-overlapping intervals.
Solution Approach 2:
The system changes the temporal parameters of light emission by adjusting the start times, durations, and overlap程度 of emission intervals. By modifying these time-based parameters, the system can continuously tune the balance between brightness and color purity, transforming the fixed trade-off into an adjustable relationship.
3Illumination intensity
If laser diodes are used for high brightness, then speckle problems occur
Solution Approach 1:
The patent introduces a temporal intermediary approach where multiple light emitters are activated in overlapping time intervals rather than simultaneously. This time-based mediation allows the system to achieve high brightness output while the sequential nature of emission reduces coherent interference effects that cause laser speckle, effectively using time division as an intermediary to resolve the speckle problem.
Data Source
AI summary
A light source system includes a first light emitter configured to emit a first light with a first color band in a first time interval of a time period, a second light emitter configured to emit a second light with a second color band in a second time interval of the time period rather than in the rest of the time period other than the second time interval, and a light guide disposed downstream from the first light emitter and the second light emitter. The first time interval and the second time interval overlap in an overlapping time interval. The first light emitter and the second light emitter synchronously emit the first light and the second light in the overlapping time interval to form a combined light beam in the light guide. The light with the second color band is dominant of the combined light beam.