Laser Projector Brightness Control via Segmented Scanning
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Solution Overview
Problem
Conventional laser projectors face limitations in brightness due to safety standards, which restrict the intensity of projected light, leading to suboptimal user experience and image quality.
Innovation Solution
A laser projector system with multiple laser sources and a controller that adjusts the separation angle and active period of each laser to ensure uniform illumination, allowing for increased brightness while adhering to eye safety standards by controlling the output to specific regions on the screen with a time difference and optimizing the angle between laser sources and the scanner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the intensity of projected light is increased to improve brightness, then image quality and user experience are improved, but eye safety standards are violated
Solution Approach 1:
The patent divides the projection system into multiple independent laser sources (red, green, blue lasers) that project to different regions of the screen. Each laser source operates at safe intensity levels individually, while their combined effect across the screen provides overall high brightness. The controller manages each laser source separately to ensure none exceed safety thresholds.
Solution Approach 2:
The patent transitions from a single high-intensity light source to multiple lower-intensity sources distributed across different spatial regions and wavelengths. By projecting to different regions of the screen and using multiple wavelengths, the system achieves high overall brightness without any single point exceeding eye safety limits.
2Illumination intensity
If multiple laser sources are used to increase brightness, then illumination intensity is improved, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it manages multiple laser sources, determines optimal separation angles, controls active periods for each laser, and ensures eye safety compliance. This multi-functional control system manages the complexity of multiple laser sources through a single integrated controller rather than requiring separate control systems for each component.
Solution Approach 2:
The system optimizes specific parameters including the separation angle between laser sources (controlled within a specific range) and the active period of each laser source. By carefully controlling these parameters, the system achieves high brightness while managing the complexity of coordinating multiple laser sources.
3Object-affected harmful factors
If lasers are projected to different regions with time difference, then eye safety is maintained, but image uniformity may be affected
Solution Approach 1:
The controller manages periodic active periods for each laser source, where each laser is activated in sequence rather than simultaneously. This periodic activation ensures that no single laser exceeds safety limits while the overlapping regions on the screen receive coordinated illumination from multiple lasers, maintaining image uniformity through timed coordination.
Solution Approach 2:
The controller determines and sets the separation angle and active period for each laser source in advance before projection begins. This preliminary configuration ensures that lasers are projected to different regions at appropriate times, maintaining both eye safety and image uniformity through pre-planned coordination rather than real-time adjustment.
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
The solution enhances brightness by up to 2.5 times while maintaining compliance with eye safety standards, improving user satisfaction and image quality by ensuring uniform light distribution and minimizing image distortion.
Implementation Method 1
a plurality of laser sources configured to generate lasers
Implementation Method 2
The laser modulator modulates the incident laser based on an image control signal of the image controller to generate a diffraction light
Implementation Method 3
the optical scanner scans the light to display an image, while mirrors are rotating a preset angle
Data Source
AI summary
There is disclosed a laser projector and a method of processing a signal thereof. The laser projector includes a plurality of laser sources configured to generate lasers, a controller configured to control each of the generated lasers to be incident on a specific region of a screen with a time difference, and a scanner configured to scan each of the lasers on the screen.