Backlight device and display apparatus having the same
AssigneeSamsung Display Co., Ltd.
InventorsKyu-Jin PARK, Hyoung-Hak KIM, Sang-Hoon PARK
Life of this patent
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Abstract
In a backlight device and a driving method thereof, a voltage controller controls a voltage level of a first input voltage in response to a dimming signal to output a second input voltage. A pulse generator receives the second input voltage from the voltage controller and generates a pulse signal having a duty ratio corresponding to the dimming signal and a high voltage level corresponding to the second input voltage. An inverter generates a lamp driving signal based on the pulse signal. At least one lamp included in the backlight device is turned on or turned off in response to a lamp driving signal to adjust luminance of the backlight device.
Claims19
A backlight device comprising:
- a voltage controller controlling a voltage level of a first input voltage in response to a dimming signal to output a second input voltage;
- a pulse generator receiving the second input voltage from the voltage controller and generating a pulse signal that has a duty ratio corresponding to the dimming signal and a high voltage level corresponding to the second input voltage;
- an inverter generating a driving signal based on the pulse signal;
- and
- a light source unit generating a light in response to the driving signal.
A display apparatus comprising:
- a panel driver generating a panel driving signal and a dimming signal in response to an image data signal and a control signal;
- a display panel displaying an image in response to the panel driving signal;
- and
- a backlight device supplying a light to a rear face of the display panel and controlling luminance of the light supplied to the display panel based on the dimming signal provided from the panel driver,
- wherein the backlight device comprises:
- a voltage controller controlling a voltage level of a first input voltage in response to the dimming signal to output a second input voltage;
- a pulse generator generating a pulse signal that has a duty ratio corresponding to the dimming signal and a high voltage level corresponding to the second input voltage;
- an inverter generating a lamp driving signal based on the pulse signal;
- and
- a light source unit generating the light in response to the lamp driving signal.
Dependencies are inferred from the claim text.