Abstract
A heads-up display (HUD) commonly uses liquid crystal technology to
generate images. However, the intensity of the light decreases significantly
due to passing through polarizers. Therefore, a polarizer-free display is
a superior approach to utilize light more efficiently. We demonstrate the
feasibility of using polymer dispersed liquid crystal (PDLC), which consists
of polymer and liquid crystal, as an optical shutter to fabricate a simple
see-through projected display device. The unique electro-optical characteristics
of PDLC make it suitable to define the projected image shape. In our device,
we used a 36 watts collimated light emitting diode as a backlight source so
that the projected image can also be seen clearly under daylight. Since PDLC
does not require/utilize polarizers, it achieved high light efficiency
$({\sim}{{70}}{\%})$
. In this paper, we showed promising results of projected images
with various colors (red, green, and blue) that can be applied to see-through
projected displays. From our experimental results, the see-through projected
display device by PDLC can achieve a contrast ratio of 1000:1 and the response
time is approximately 15 ms. The driving voltage is less than 25 V and brightness
is over 3000 nit.
© 2013 IEEE
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