LIGHT SENSING CIRCUIT, BACKLIGHT CONTROL APPARATUS HAVING THE SAME, AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME
First Claim
1. A backlight control apparatus for controlling a backlight to irradiate light to a rear side of an LC panel, the apparatus comprising:
- a light sensing circuit that detects an amount of external light introduced into the LC panel by a first MOS-transistor and a second MOS-transistor serially connected to each other, and outputs a voltage corresponding to the detected optical amount;
an inverter that supplies an output power to a backlight; and
an inverter driving controller that controls a driving of the inverter according to the voltage output from the light sensing circuit,wherein the first MOS-transistor and the second MOS-transistor are disposed in the second region so that the first MOS-transistor is exposed to external light and the second MOS-transistor is not exposed to external light.
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Accused Products
Abstract
A light sensing circuit capable of enhancing a reliability by lowering a dependency on a temperature change without using a resistor, a backlight control apparatus having the same, and an LCD device having the same. The light sensing circuit includes a first MOS-transistor; and a second MOS-transistor serially connected to the first MOS-transistor between a first power terminal and a ground terminal, in which a second power terminal is connected to each gate terminal of the first MOS-transistor and the second MOS-transistor, and an optical amount detecting terminal is connected to a common connection point between a drain terminal of the first MOS-transistor and a source terminal of the second MOS-transistor.
21 Citations
8 Claims
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1. A backlight control apparatus for controlling a backlight to irradiate light to a rear side of an LC panel, the apparatus comprising:
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a light sensing circuit that detects an amount of external light introduced into the LC panel by a first MOS-transistor and a second MOS-transistor serially connected to each other, and outputs a voltage corresponding to the detected optical amount; an inverter that supplies an output power to a backlight; and an inverter driving controller that controls a driving of the inverter according to the voltage output from the light sensing circuit, wherein the first MOS-transistor and the second MOS-transistor are disposed in the second region so that the first MOS-transistor is exposed to external light and the second MOS-transistor is not exposed to external light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification