BACKLIGHT UNIT, METHOD OF OPERATING THE SAME AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME
First Claim
Patent Images
1. A backlight unit comprising:
- a light source;
an inverter which provides the light source with an input voltage; and
a printed circuit board connected to the light source,wherein the printed circuit board includes a protection circuit which detects an open-lamp-protection voltage which varies according to a change of the input voltage, and changes a reference voltage according to the change of the input voltage, andwherein the protection circuit turns off the inverter when the detected open-lamp-protection voltage is higher than the changed reference voltage.
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Abstract
A backlight unit includes; a light source, an inverter which provides the light source with an input voltage, and a printed circuit board (“PCB”) connected to the light source, wherein the PCB includes a protection circuit which detects an open-lamp-protection voltage which varies according to a change of the input voltage and changes a reference voltage according to the change of the input voltage, wherein the protection circuit turns off the inverter when the detected open-lamp-protection voltage is higher than the changed reference voltage.
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Citations
22 Claims
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1. A backlight unit comprising:
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a light source; an inverter which provides the light source with an input voltage; and a printed circuit board connected to the light source, wherein the printed circuit board includes a protection circuit which detects an open-lamp-protection voltage which varies according to a change of the input voltage, and changes a reference voltage according to the change of the input voltage, and wherein the protection circuit turns off the inverter when the detected open-lamp-protection voltage is higher than the changed reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a backlight unit, the method comprising:
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applying an input voltage to a light source; detecting an open-lamp-protection voltage using a capacitor to distribute the input voltage; changing a reference voltage using the capacitor to distribute the input voltage; and turning off the input voltage applied to the light source when the detected open-lamp-protection voltage is higher than the changed reference voltage. - View Dependent Claims (12, 13, 14)
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15. A liquid crystal display device comprising:
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an liquid crystal display panel which displays an image; and a backlight unit providing the liquid crystal display panel with light, the backlight unit including; a light source; an inverter which provides the light source with an input voltage; and a printed circuit board connected to the light source, the printed circuit board including a protection circuit which detects an open-lamp-protection voltage which varies according to a change of the input voltage and changes a reference voltage according to the change of the input voltage, and the protection circuit turns off the inverter when the detected open-lamp-protection voltage is higher than the changed reference voltage. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification