Abstract
We demonstrate an optimized fringe-field switching
pixel structure to apply negative liquid crystals (nLCs) for high-resolution
mobile displays. Pixel transmittance can be improved by applying nLCs,
but the driving voltage increases because
$\Delta \varepsilon$
of the nLC
is lower than that of the positive LC (pLC). In spite of applying
an nLC, a similar driving voltage can be achieved by changing the
pixel structure. It is easy to obtain a low driving voltage in a strong
electric field by applying a thinner passivation layer using photo
acryl (PAC). In addition, while the edge electrodes of the conventional
${\rm V}_{\rm com}$
-on-top (VOT) structure are operated with in-plane switching,
all electrodes of the pixel-on-top (POT) structure are operated with
fringe-field switching. Therefore, the driving voltage can be reduced
by applying a POT structure with PAC. Furthermore, crosstalk can be
improved because the capacitance
$(C_{\rm dp})$
between data lines and
pixel electrodes is reduced by applying a POT structure. As a result,
applying the proposed structure with nLC has two advantages. First,
transmittance increases by more than 20% based on 4.5-in-high definition
pixels. Second, crosstalk in the POT structure is more stable than
that in the VOT structure, despite variations in low gate voltage
$({\rm V}_{\rm GL})$
. Consequently, because of higher transmittance and stable
crosstalk, the proposed POT structure with nLC can be used for mobile
displays.
© 2014 IEEE
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