Abstract
In this paper, is proposed a smart design for a
two-dimensional (2-D) optical display using 2-D laser scanning and an
electronically programmable three-dimensional (3-D) beamforming lens
element. Specifically, an electronically controlled variable focal length
lens (ECVFL) adjusts its focus power to produce the smallest focused beam
spot on the display screen within the designed variable screen distance
range. Since the screen distance is known, the angular scan range for the
scan mirrors can be computed to generate the desired number of scanned spots
in the 2-D display. Thus a smart display with the smallest pixel spot size
is formed leading to the highest spatial resolution display for any given
distance. Furthermore, if the scan angles are increased, a larger size
display of higher pixel count can be formed without sacrificing display
pixel size at this larger display size. A proof-of-concept smart display
optics system is designed and demonstrated for a red 633-nm laser wavelength
and an optimal display variable screen distance of 20–150 cm,
giving optimized display pixel sizes of 51.92 and 538.1 µm, respectively.
© 2011 IEEE
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