High‐efficiency optical system for ultra‐short‐throw‐distance projector based on multi‐laser light source

Okuda, Masahiro; Matsumoto, Shimpei; Maeda, Makoto; Arai, Kohei; Tsuji, Kiichiro; Ando, Tetsu; Abe, Takaaki; Inoue, M.; Amano, Ryuhei; Ikeda, Takashi; Kanayama, Hideyuki

doi:10.1889/jsid19.2.221

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Typical LED pico-projectors have a throw ratio (image diagonal: distance to the screen) from about 1:1 to 0.5:1. 28 Because laser light has a higher fnumber, it will be possible to make very short throw optical engines 29,30 with throw ratios on the order of 5:1 and with 100% offset (relative to the projected plane). This means that an engine only ~3 in.…”

Section: How Lasers Will Change End Productsmentioning

confidence: 99%

Laser + LCOS projection‐technology revolution

Guttag¹,

Hurley²

2012

J Soc Info Display

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The advent of affordable direct-diode lasers changes all the rules for optical designs and the associated technologies that generate the images from laser light. These new lasers are forseen as driving fundamental changes in the size, power consumption, cost, resolution, and even the uses for pico-projectors. This paper discusses these topics from the perspective of laser-light-illuminated LCOS microdisplays.

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Section: How Lasers Will Change End Productsmentioning

confidence: 99%

Laser + LCOS projection‐technology revolution

Guttag¹,

Hurley²

2012

J Soc Info Display

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“…The technology of home projectors has matured significantly and high-precision projector correction and calibration have been investigated for years [1] [2]. The ultra-short throw distance projector also represents a strong contender among future consumer electronic products [3]. Though automatic focusing [4][5][6] and keystone correction techniques [7] [8] are well-studied, projectors capable of automatic focusing and keystone correction are much more expensive than manual projectors.…”

Section: Introductionmentioning

confidence: 99%

P‐18.2: Relative Localization for Real‐time Adaptive Quadruped Mobile Projector System

Gao,

Cheng,

et al. 2024

Symp Digest of Tech Papers

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The technology of home projectors has matured significantly. However, most projectors are limited to static manual projectors, and projectors capable of automatic focusing and keystone correction are expensive. Furthermore, there is still room for development in the adaptability and real‐time performance of the screen distance and spatial angle measurement systems that projectors use for automatic focusing and keystone correction. Compared with the existing laser focusing technology, in this research, we present an alternative solution to acquire real‐time screen distance and spatial angle estimations using relative localization algorithms and an ultrasonic ranging sensor array. The relative localization information can then be employed for automatic focusing and keystone correction of a projector mounted on the mobile platform of an open‐source quadruped robot. The proposed approach will enhance the versatility and adaptability of the projector system, providing an economical solution for real‐time automatic focusing and keystone correction in mobile projector platforms.

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“…27,28) These devices need a small etendue for light sources to obtain high light-use efficiency in projector systems. 29) A small etendue is obtained from a small near-field spot size of semiconductor lasers. Various light sources are shown with their etendue values in Table I, which shows that laser light has the advantage of etendue.…”

Section: Introductionmentioning

confidence: 99%

High-temperature operation of 640 nm wavelength high-power laser diode arrays

Imanishi¹

2017

Jpn. J. Appl. Phys.

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We realized the fabrication of a red semiconductor laser array with high optical power and reliability using an AlGaInP-based compound semiconductor. To obtain a high optical output, the semiconductor laser requires high-quality quantum wells. In this work, we improved quantum well layer abruptness by applying high-temperature growth condition to quantum wells. We obtained a very high optical power of 20.1 W with a wavelength of 644 nm under this growth condition using magnesium as a dopant for a p-type layer. As a results, we achieved a high characteristic temperature of 68 K and a high electrical-to-optical (E–O) conversion efficiency 37% at 15 W optical output. When the laser lifetime at a temperature of 35 °C and an optical output power of 6.6 W for operation is defined as the time when the output power decreases to 50%, which is usually used for defining the lifetime of ultra high-pressure (UHP) lamps in projection display, we can estimate the lifetime of this laser to be longer than 10000 h or more.

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High‐efficiency optical system for ultra‐short‐throw‐distance projector based on multi‐laser light source

Cited by 4 publications

References 6 publications

Laser + LCOS projection‐technology revolution

Laser + LCOS projection‐technology revolution

P‐18.2: Relative Localization for Real‐time Adaptive Quadruped Mobile Projector System

High-temperature operation of 640 nm wavelength high-power laser diode arrays

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