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US 7,733,336 B2Granted
Liquid crystal display device and method of driving the same
AssigneeLG Display Co., Ltd.
InventorKyoung-Moon Lim
Life of this patent
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Abstract
A liquid crystal display device includes a liquid crystal panel, a backlight unit supplying light to the liquid crystal panel, a photo sensor detecting a brightness of an ambient surrounding the liquid crystal panel and generating a sense signal, and a signal processor adjusting a luminance of the light supplied by the backlight unit according to the sense signal.
Claims15
A liquid crystal display device, comprising:
- a liquid crystal panel;
- a backlight unit supplying light to the liquid crystal panel;
- a photo sensor detecting a brightness of an ambient surrounding the liquid crystal panel and generating a sense signal, wherein the sense signal generated by the photo sensor is a current type sense signal;
- a signal processor adjusting a luminance of the light supplied by the backlight unit according to the sense signal;
- and
- a sensor controller converting the current type sense signal to a voltage type sense signal,
- wherein the sensor controller includes:
- first to third thin film transistors each having a gate electrode, a source electrode and a drain electrode;
- a variable element connected to the third thin film transistor;
- an enable signal input terminal receiving an enable signal, the enable signal having one of high and low level voltages;
- a ground terminal receiving a ground signal;
- a variable signal input terminal applying a variable signal to the variable element;
- and
- an output terminal outputting an output voltage to the signal processor,
- wherein the photo sensor is connected to the ground terminal and the gate electrodes of the second and third thin film transistors.
12 more elements
A method of driving a liquid crystal display device, comprising:
- detecting a brightness of an ambient surrounding a liquid crystal panel by a photo sensor and generating a current type sense signal;
- converting the current type sense signal into a voltage type sense signal by using a sense controller,
- wherein the sensor controller includes:
- first to third thin film transistors each having a gate electrode, a source electrode and a drain electrode;
- a variable element connected to the third thin film transistor;
- an enable signal input terminal receiving an enable signal, the enable signal having one of high and low level voltages;
- a ground terminal receiving a ground signal;
- a variable signal input terminal applying a variable signal to the variable element;
- and
- an output terminal outputting an output voltage to the signal processor,
- wherein the photo sensor is connected to the ground terminal and the gate electrodes of the second and third thin film transistors;
- and
- adjusting a brightness of a light supplied to the liquid crystal panel according to the voltage type sense signal.
10 more elements
Dependencies are inferred from the claim text.