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
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription