Liquid crystal display device using a dimming control method and method for driving the same
AssigneeLG Display Co., Ltd.
InventorsDongWoo Kim, DaeHo Cho, Junghwan Lee
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Abstract
An LCD device and a driving method thereof are provided. The LCD device includes a panel, a timing controller, and a backlight unit. The panel is driven by a data driver and a gate driver. The timing controller controls the data driver and the gate driver. The backlight unit turns on or off a light source according to a dimming control signal transferred from the timing controller. The backlight unit is configured such that a turn-off delay time of a light source turned off according to the dimming control signal is shorter than a turn-on delay time of a light source turned on according to the dimming control signal.
Claims11
A liquid crystal display (LCD) device, comprising:
- a panel driven by a data driver and a gate driver;
- a timing controller configured to control the data driver and the gate driver, compare and analyze received video data to determine whether luminance has been changed to more than a predetermined value, and generate a dimming control signal according to the determined result;
- and
- a backlight unit configured to turn on or off a light source part according to the dimming control signal transferred from the timing controller,
- wherein the timing controller is further configured to determine whether the dimming control signal is to be an on-dimming control signal or an off-dimming control signal, to control the backlight unit to increase luminance of the backlight unit at a first linear slope from an OFF level to an ON level in response to determining that the dimming control signal is to be the on-dimming control signal, and to control the backlight unit to decrease the luminance of the backlight unit at a second linear slope from the ON level to the OFF level in response to determining that the dimming control signal is to be the off-dimming control signal, an absolute value of the first linear slope being less than an absolute value of the second linear slope such that a first time to increase from the OFF level to the ON level is longer than a second time to decrease from the ON level to the OFF level and wherein the OFF level corresponds to the light source part not emmiting light and the ON level correspondonce to the light source part emitting light.
A driving method of a liquid crystal display (LCD) device, the driving method comprising:
- receiving video data;
- comparing and analyzing the received video data to determine whether luminance has been changed to more than a predetermined value;
- determining whether the dimming control signal is to be an on-dimming control signal or an off-dimming control signal;
- generating a dimming control signal for turning on or off a light source of a backlight unit according to the determined result;
- controlling the backlight unit to increase luminance of the backlight unit at a first linear slope from an OFF level to an ON level in response to determining that the dimming control signal is to be the on-dimming control signal;
- and
- controlling the backlight unit to decrease the luminance of the backlight unit at a second linear slope from the ON level to the OFF level in response to determining that the dimming control signal is to be the off-dimming control signal, an absolute value of the first slope being less than an absolute value of the second slope such that a first time to increase from the OFF level to the ON level is longer than a second time to decrease from the ON level to the OFF level and wherein the OFF level corresponds to the light source not emitting light on ON level corresponds to the light source emitting light.
Dependencies are inferred from the claim text.