We propose an optical configuration of a twisted-nematic liquid crystal (TNLC) device driven by an in-plane electric
field for a single-cellgap transflective display. The dark state of the reflective part is realized by a nematic liquid crystal
layer with the twisted angle of 63.6° and the retardation of 194 nm, while a quarter-wave plate is inserted for the dark
state of the transmissive part. Wavelength dispersion of the TNLC layer is suppressed by introducing a half-wave plate,
whose optimum angle is found by using the Muller matrix method. Different directions of electric fields rotate liquid
crystals to 15° for the bright state of the reflective part, but to -30° for that of the transmissive part. With the proposed
configuration, we can realize a single-gamma transflective display in single cellgap structure without any in-cell
retardation layers. By fabricating a 2.0" qCIF+ (176×RGB×220) prototype panel, we demonstrated both high
reflection/transmission and single gamma of the proposed configuration.
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