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14.2: Waveguide‐Based Pico‐Projector with Only One Lens for Cell‐Phone Applications
Author(s) -
Li Kenneth
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256647
Subject(s) - projector , lens (geology) , chip , computer science , projection (relational algebra) , phone , camera phone , component (thermodynamics) , feature (linguistics) , optics , computer hardware , artificial intelligence , telecommunications , physics , linguistics , philosophy , algorithm , thermodynamics
With the advancements in the LED development, it is now possible to have projectors small enough to be integrated into cell phones. Similar to the cell phone cameras, in order to have a high adoption rate, the cost have to be low, which requires low component count and simple construction. To achieve low cost, the most important factor is to use a small imager chip, which increase the illumination requirements. Recycling is needed to match the illumination etendue to that of the imager chip. This paper presents an integrated approach to the illumination with recycling and projection architecture using waveguides such that the component count is low and the whole projector can be assembled without high tolerance. One key feature is that the complete projector consists of only one lens, namely, the projection lens.