Multi-Color Laser Control for Speckle and Gamut Desaturation
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Solution Overview
Problem
Laser-based light projection systems face challenges such as laser speckle, unnatural color saturation due to narrow emission bands, and complex brightness control, which degrade image quality and brightness.
Innovation Solution
A control methodology for multi-color laser light sources involves simultaneously operating multiple lasers of different colors at varying intensity levels during a display frame, incorporating pulse width modulation to adjust optical power and reduce coherence, thereby reducing speckle and desaturating the color gamut while increasing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser light sources are used in projection systems, then brightness and color gamut are improved, but laser speckle and unnatural color saturation occur
Solution Approach 1:
The patent applies periodic action by rapidly switching between multiple laser wavelengths (e.g., red, green, blue lasers) in a time-sequential manner within each display frame. Each laser is activated for specific time periods with varying intensity levels, creating a periodic modulation pattern that reduces speckle while maintaining brightness. The controller alternates between different laser combinations to achieve both high illumination and speckle reduction.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the intensity levels of individual lasers based on the required brightness and color output. The controller varies the optical power of each laser in real-time during frame rendering, allowing adaptive control of brightness while simultaneously managing speckle effects through changing intensity patterns across different time periods.
2Adaptability or versatility
If narrow emission band lasers are used, then color gamut is widened, but colors appear unnatural and overly saturated
Solution Approach 1:
The patent uses periodic action by cycling through multiple laser wavelengths and combining them in various patterns during frame rendering. By periodically activating different laser combinations (e.g., red-green, green-blue, blue-red, or all three together), the system achieves a broader effective color gamut while the temporal variation prevents any single narrow band from dominating, thus reducing unnatural saturation.
Solution Approach 2:
The patent merges multiple laser wavelengths together in a combined output beam. By combining light from red, green, and blue lasers simultaneously or in rapid succession, the system achieves an expanded color gamut that encompasses a wider range of colors. The merging of these narrow emission bands creates a more balanced and natural color reproduction while maintaining the versatility of wide color gamut.
3Illumination intensity
If multiple lasers are operated simultaneously, then brightness control becomes complex, but speckle reduction and brightness improvement are achieved
Solution Approach 1:
The patent applies periodic action by implementing a structured time-sequential control pattern where lasers are activated in predetermined sequences during each frame. The controller uses periodic timing signals to manage which lasers are active during specific time periods, transforming the complexity of simultaneous multi-laser control into a more manageable periodic switching scheme that still achieves brightness improvement and speckle reduction.
Solution Approach 2:
The patent implements dynamics through a dynamic control system that adaptively adjusts laser intensity levels based on real-time requirements. The controller dynamically modulates the optical power of each laser during operation, allowing flexible brightness control while managing the complexity through intelligent algorithms that optimize the combination and intensity of multiple lasers based on the desired output.
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 approach effectively reduces laser speckle and desaturates color gamut, enhancing image quality and brightness in laser-based projection systems.
Implementation Method 1
incorporating pulse width modulation to adjust optical power and reduce coherence
Implementation Method 2
reduce coherence, thereby reducing speckle and desaturating the color gamut while increasing brightness
Data Source
AI summary
A laser controller can be configured to, during a first time period, output a first control signal specifying a first average non-zero intensity level at which a first laser is instructed to produce first laser light of one color, during a second time period, output the first control signal specifying a second average non-zero intensity level, lower than the first average non-zero intensity level, for the first laser light, during at least a portion of the first time period, output a second control signal specifying a third average non-zero intensity level at which a second laser instructed is to produce second laser light of a different color, and during at least a portion of the second time period, output the second control signal specifying a fourth average non-zero intensity level, higher than the second and third average non-zero intensity levels, for the second laser light.