Title :
A Novel BLU-Free Full-Color LED Projector Using LED on Silicon Micro-Displays
Author :
Zhao Jun Liu ; Wing Cheung Chong ; Ka Ming Wong ; Ka Ho Tam ; Kei May Lau
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
In this letter, we have described the design and fabrication of a novel backlight-unit (BLU)-free full-color light emitting diode (LED) based projector. The prototype used three active matrix addressable light emitting diode on silicon (LEDoS) micro-displays with peak emission wavelengths of 630, 535, and 445 nm. The LEDoS micro-displays were realized by integrating monolithic micro-LED arrays and silicon-based integrated circuits using a flip-chip bonding technique. Since the LEDoS micro-displays are self-emitting, conventional BLUs used in liquid crystal displays were not needed. Using a trichroic prism to combine the light from the three LEDoS chips, we have produced the world´s first three-LEDoS projector. This BLU-free three-LEDoS projector consists of much fewer optical components and has significantly higher light utilization efficiency compared with conventional projectors.
Keywords :
flip-chip devices; integrated circuit bonding; integrated optics; light emitting diodes; micro-optics; microdisplays; optical arrays; optical design techniques; optical fabrication; optical projectors; BLU-free full-color LED projector; LED; LEDoS micro-displays; Si; backlight unit; flip-chip bonding; light emitting diode; light emitting diode on silicon; silicon microdisplays; silicon-based integrated circuits; trichroic prism; Color; Flip-chip devices; Image color analysis; Indium; Optical imaging; Organic light emitting diodes; Light emitting diode; active circuits; projection display; self-emitting display;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2285229
