Abstract
This paper presents a transparent digital information
display (DID) using a field sequential liquid crystal display (FS-LCD).
The pixel structure and simultaneous driving method for FS-LCD are
proposed to improve the transmittance of a transparent DID and to
reduce color mixing artifacts. The proposed pixel consists of a memory
stage and a liquid crystal (LC) driving stage, and all pixels are
simultaneously operated together as the programmed data in the memory
stage is simultaneously transferred to the LC driving stage. In addition,
the data voltage boosting method with memory capacitor is adopted
to maintain the transmittance of FS-LCD. The measured transmittance,
contrast ratio, and color gamut are 16.7%, 4000, and 85.6% compared
to NTSC in the CIE-1931 color space, respectively. The measurement
results of the proposed transparent DID show higher transmittance
and wider color gamut compared to conventional DIDs. Furthermore,
to verify the reduction in the color mixing artifact, the color variations
(
${\bf \Delta} {\bf
x}$
and
${\bf \Delta} {\bf y}$
) in the x-axis
and y-axis of the CIE-1931 chromaticity diagram are measured. The
${\bf \Delta} {\bf x}$
and
${\bf
\Delta} {\bf y}$
are smaller than 0.002 across the
whole display panel. Therefore, the proposed transparent DID shows
superior color uniformity by reducing color mixing artifacts.
© 2014 IEEE
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