US 8,077,127 B2Granted

Liquid crystal display device and method of driving the same

AssigneeSamsung Electronics Co., Ltd.

InventorsJae-Hyun Cho, Jin-Ho Park, Jung-Hwan Cho

Life of this patent

Estimating the term…

Loading patent…

Abstract

An LCD device includes an LCD panel and a power supply section. The LCD panel includes a first substrate having a storage electrode and a pixel electrode, a second substrate having a common electrode, and a liquid crystal layer interposed between the first and second substrates. The LCD panel has an alignment interval during which liquid crystal molecules are transitioned from a splay state to a bend state and a normal operating interval during which an image is displayed in the bend state. The power supply section supplies a first alignment voltage that is higher than the data voltage to the common electrode and supplies a second alignment voltage that is lower than the data voltage to the storage electrode, during the alignment interval. Thus, a transition speed from a transient splay state into a bend state is enhanced, so that an alignment interval may be decreased.

Claims12

Dependent claims

A liquid crystal display (LCD) device comprising:

an LCD panel including a first substrate having a storage electrode and a pixel electrode that receives a data voltage in response to operation of a thin-film transistor, a second substrate having a common electrode, and a liquid crystal layer interposed between the first and second substrates, the LCD panel having an alignment interval during which liquid crystal molecules are transitioned from a splay state to a bend state, and a normal operating interval during which an image is displayed during the bend state;
and
a power supply section comprising a first alignment voltage generating part configured to generate a first alignment voltage, a second alignment voltage generating part configured to generate a second alignment voltage, and a gate voltage generating part configured to generate a gate-on voltage and a gate-off voltage, a common voltage generating part generating the common voltage, a first switching part being optionally connected to the first alignment voltage generating part and the common voltage generating part, the first switching part being electrically connected to the common electrode and a second switching part being optionally connected to the second alignment voltage generating part and the common voltage generating part, the second switching part being electrically connected to the storage electrode,
wherein the first alignment voltage is higher than the data voltage and is applied to the common electrode during the alignment interval, and the second alignment voltage is lower than the data voltage and is applied to the storage electrode during the alignment interval,
wherein the gate-on and gate-off voltages control operation of the thin-film transistor, and
wherein the power supply section supplies a common voltage that is lower than the first alignment voltage and is higher than the second alignment voltage to the common and storage electrodes during the normal operating interval.

3 more elements

A method for driving a liquid crystal display (LCD) device having an LCD panel including a first substrate having a storage electrode and a pixel electrode that receives a data voltage, a second substrate having a common electrode, and a liquid crystal layer interposed between the first and second substrates, the LCD panel having an alignment interval during which liquid crystal molecules are transitioned from a splay state to a bend state and a normal operating interval during which an image is displayed during the bend state, the method comprising:

supplying a first alignment voltage, a second alignment voltage, a gate-on voltage, and a gate-off voltage from a power supply section and
supplying a common voltage that is lower than the first alignment voltage and is higher than the second alignment voltage to the common and storage electrodes during the normal operating interval,
wherein the power supply section comprises a first alignment voltage generating part generating the first alignment voltage, a second alignment voltage generating part generating the second alignment voltage, and a gate voltage generating part generating the gate-on voltage and the gate-off voltage, a common voltage generating part generating the common voltage, a first switching part being optionally connected to the first alignment voltage generating part and the common voltage generating part, the first switching part being electrically connected to the common electrode and a second switching part being optionally connected to the second alignment voltage generating part and the common voltage generating part, the second switching part being electrically connected to the storage electrode
wherein the first alignment voltage is higher than the data voltage to the common electrode and supplying the second alignment voltage that is lower than the data voltage to the storage electrode during the alignment interval,
wherein the gate-on and gate-off voltages control operation of the thin-film transistor.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/776,446Filed 11 Jul 2007
Priority: KR 10-2006-006665918 Jul 2006
Published: US 2008/0018813 A124 Jan 2008
Granted: 13 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G02F 1/136213
Active matrix addressed cells: storage capacitors associated with the pixel electrode
G02F 1/1395
The birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells: optically compensated birefringence…
G09G 3/3655
Using an active matrix: details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
G09G 2300/0491
Related to liquid crystal pixels: use of a bi-refringent liquid crystal, optically controlled bi-refringence [OCB] with bend and splay states, or…