Design method of high throughput laser scanning projection system based on broad-area laser diode

Area of Science:

• Optics and Photonics
• Display Technologies
• Semiconductor Devices

Background:

• Laser scanning projection offers superior color gamut and energy efficiency.
• Current limitations include insufficient output power from single-mode lasers and poor beam quality/low modulation frequency from broad-area laser (BAL) diodes.
• These limitations restrict applications requiring high resolution and high frame rates.

Purpose of the Study:

• To analyze resolution-determining factors in BAL diode-based scanning projection systems.
• To investigate parametric trade-offs in micro-electro-mechanical systems (MEMS) scanners.
• To propose an optimized configuration for enhanced laser MEMS scanning projectors.

Main Methods:

• Analysis of resolution mechanisms in BAL diode-MEMS scanner systems.
• Optimization of emitting area geometry alignment with MEMS scanning direction.
• Development of a novel optical engine architecture for multi-laser input and scanning.

Main Results:

• Achieved 720P high resolution and 60 Hz high frame rate projection.
• Demonstrated low distortion (<3.02%) and an ultra-short throw ratio (0.29).
• Enabled watt-level optical power output, overcoming previous limitations.

Conclusions:

• The proposed design methodology effectively addresses limitations in output power, modulation frequency, and throw ratio.
• Optimized alignment and optical engine architecture enable high performance under constrained MEMS parameters.
• Significantly expands the application scope of laser MEMS scanning projectors.