Field sequential driving method and field sequential liquid crystal display
A field sequential LCD and a method of initializing a liquid crystal using the same are provided. A reset voltage having a higher voltage level than a data signal is applied to initialize the liquid crystal. Accordingly, the field sequential LCD includes a reset voltage generator to generate the reset voltage having a higher voltage level than the data signal. The reset voltage is applied to the liquid crystal according to a selection operation of the source driver.
1 . A method for driving a field sequential liquid crystal having three sub-frames, the method comprising:
activating the three sub-frames in sequence, wherein each sub-frame activation comprising:
applying a reset voltage having a first voltage level to initialize the liquid crystal;
applying a data signal having a second voltage level that is lower than the first voltage level to the liquid crystal; and
emitting light to the liquid crystal.
2 . The method according to claim 1 , wherein the applying a reset voltage is performed during a reset period, and the applying a data signal and the emitting light are performed during a data programming period.
3 . The method according to claim 2 , wherein the reset voltage comprises a square wave.
4 . The method according to claim 1 , wherein the reset voltage comprises at least two square waves during the reset period.
5 . The method according to claim 3 , wherein the data signal comprises a square wave.
6 . The method according to claim 4 , wherein the data signal comprises a pulse width modulated signal.
7 . A field sequential liquid crystal display (LCD) comprising:
a LCD panel for displaying an image;
a gate driver for supplying a scan signal to the LCD panel;
a source driver for supplying a data signal to the LCD panel during a data programming period, and supplying a reset voltage to the LCD panel during a reset period;
a timing controller for receiving digital video data and synchronization signals, and generating a control signal and the data signal for displaying an image in response to the synchronization signal;
a gradation voltage generator for receiving the data signal from the timing controller and supplying data modulated based on a lookup table to the source driver;
a reset voltage generator for generating the reset voltage having a higher voltage level than the data signal in response to the control signal generated by the timing controller, and supplying the reset voltage to the source driver;
a light source controller for generating a light control signal in response to the control signal generated by the timing controller; and
a light emitter having a plurality of lamps for emitting light in response to the light control signal of the light source controller.
8 . The field sequential LCD according to claim 6 , wherein the source driver supplies one of the data signal or the reset voltage to the LCD panel in response to the data control signal generated by the timing controller.
9 . The field sequential LCD according to claim 6 , wherein the reset voltage generator comprises a DC-DC converter to generate the reset voltage having a higher voltage level than the data signal.
10 . The field sequential LCD according to claim 6 , wherein the reset voltage generator comprises a bootstrap circuit to generate the reset voltage having a higher voltage level than the data signal.
11 . The field sequential LCD according to claim 8 , wherein the reset voltage comprises a square wave.
12 . The field sequential LCD according to claim 8 , wherein the reset voltage comprises at least two square waves during the reset period.
13 . The field sequential LCD according to claim 6 , wherein the data signal comprises a square wave.
14 . The field sequential LCD according to claim 6 , wherein the data signal comprises a pulse width modulated signal.
15 . A method for driving a field sequential liquid crystal, the method comprising:
initializing the liquid crystal by applying a reset signal to the liquid crystal;
programming the liquid crystal by applying a data signal having a voltage level lower than voltage level of the reset signal to the liquid crystal and emitting light to the liquid crystal.
16 . The method according to claim 15 , wherein the reset signal comprises a square wave.
17 . The method according to claim 15 , wherein the reset signal comprises at least two square waves during the reset period.
18 . The method according to claim 15 , wherein the data signal comprises a square wave.
19 . The method according to claim 15 , wherein the data signal comprises a pulse width modulated signal.