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Transflective Mode
Transflective LCDs combine the features of transmissive and reflective LCDs. As a
result of years of development, Kyocera is now recognized as the leader in
transflective technology. The huge benefit of transflective LCDs is that they
are sunlight readable, like reflective displays.
Ambient sunlight will overwhelm the typical transmissive LCD. In a transflective
display, the bright ambient light is reflected back in lighted subpixels, so the
brighter the ambient light - the brighter the display. In low light environments,
the CFL backlight provides sufficient light for an attractive transmissive display,
much brighter than frontlit reflective displays.
Internal Slit-mirror (ISM) Transflective LCDs
In 2003 Kyocera began the transition to ISM transflective architecture. The mirror
is completely reflective, but with holes in each subpixel to allow the backlight to
shine through. The size of the holes determines whether the transflective performance
is reflective-rich or transmissive-rich. There are also slits in the color filter
which allow more light to be reflected by an "on" subpixel, thus increasing
the contrast in reflective mode.
Typical Half-mirror (IHM) Transflective LCDs
The illustration above shows the half-mirror transflective architecture used by
Kyocera in typical industrial displays in 2000 - 2002. The design of the half-mirror
is crucial to the performance of a transflective display. Kyocera tailored its thickness
to create different proportions of reflectivity and transmissivity. In 2001, Kyocera
began using a more transparent color filter and an improved scattering film, which
together greatly improved reflective performance. However reflective performance did
not need improvement, so Kyocera also introduced the -L89 configuration with
increased transmissivity and reduced reflectivity of the half-mirror, which improved
the brightness under indoor office light without reducing reflective performance.
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