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

Laser scanning projection is regarded as a highly promising projection technology owing to its advantages of a wide color gamut and high energy efficiency. However, its application scenarios are constrained by the insufficient output power of single-mode laser diodes. The adoption of broad-area laser (BAL) diodes offers a potential solution, but their poor beam quality and low modulation frequency hinder the achievement of high resolution and high frame rate projection. This paper analyzes the resolution-determining mechanisms within BAL diode-based scanning projection systems and the parametric trade-offs in MEMS scanners. Based on this, an optimized configuration is proposed to rationally align the emitting area geometry of BAL diodes with the MEMS scanning direction. Meanwhile, multi-laser inputs and scanning are achieved through a newly developed optical engine architecture, ultimately ensuring adequate projection resolution and frame rate under constrained MEMS scanner parameters. A comprehensive design example, accompanied by full performance and tolerance analyses, is presented, which achieves high resolution (720P), high frame rate (60 Hz), low distortion (