Microprojection Engine
Miniature laser projection uses two-axis MEMS scanning mirrors and RGB lasers to scan an image. The source describes three projection generations: CRT, expanded as Crystal Ray Tube with the Chinese meaning cathode-ray tube; LCD (Liquid Crystal Display); and LCOS/DLP (Digital Light Processor). Early CRT has a long history in aerospace and remote monitoring. Texas Instruments' DLP micromirror reflection improves brightness/contrast and reduces size/weight. LCOS (Liquid Crystal on Silicon) combines semiconductor processing with LCD, emerging in the late1990s; the source credits Aurora Systems'2000 products, with high resolution, low price and reflective imaging. Low power, cost and high resolution are strengths. Unlike glass-based LCD, LCOS is built on silicon. Compared with projector high-temperature-polysilicon LCD using transmission, with about3% light efficiency and difficult resolution scaling, reflective LCOS exceeds40% efficiency. Common low-cost CMOS processes avoid extra investment and scale with semiconductor miniaturization, while specialized polysilicon LCD needs separate equipment and is harder to make cheaper. The description references a technology comparison.
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