Display device and driving device for a light source
First Claim
1. A driving device for at least one light source, comprising:
- a temperature sensor operable for sensing a surrounding temperature of the light source and outputting a first control signal in response to the sensed temperature;
a signal output portion operable for receiving a second control signal based on a first brightness control signal applied from an external source;
changing the second control signal based on the first control signal; and
outputting the changed second control signal; and
an inverter controller operable for receiving the changed second control signal and outputting a third control signal based on the changed second control signal, whereinthe first control signal becomes a low level when the surrounding temperature of the light source is less than a predetermined temperature of the light source, and the second and third control signals are adjusted based on the first control signal, andthe second control signal becomes a low level when the first control signal is a low level, and the third control signal is ramped up to a high level for driving the at least one light source.
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Accused Products
Abstract
A light source portion for a liquid crystal display (LCD) device may prevent reduction of the life span of the multiple lamps (LPs) when a surrounding temperature of the multiple LPs is less than a predetermined temperature of the LCD device. The LCD device comprises first and second brightness control portions receiving a brightness control signal, a temperature sensor, a signal output portion connected to the first and second brightness control portions and the temperature sensor, and an inverter portion turning on or turning off the multiple LPs based on the control signal from the signal output portion. When the temperature sensed by the temperature sensor is less than the predetermined temperature of the LCD device, the signal output portion switches the brightness control signal from a high level to a low level, and makes the multiple LPs maintain the high level until the surrounding temperature becomes more than the predetermined temperature.
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Citations
19 Claims
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1. A driving device for at least one light source, comprising:
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a temperature sensor operable for sensing a surrounding temperature of the light source and outputting a first control signal in response to the sensed temperature; a signal output portion operable for receiving a second control signal based on a first brightness control signal applied from an external source;
changing the second control signal based on the first control signal; and
outputting the changed second control signal; andan inverter controller operable for receiving the changed second control signal and outputting a third control signal based on the changed second control signal, wherein the first control signal becomes a low level when the surrounding temperature of the light source is less than a predetermined temperature of the light source, and the second and third control signals are adjusted based on the first control signal, and the second control signal becomes a low level when the first control signal is a low level, and the third control signal is ramped up to a high level for driving the at least one light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 19)
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11. A driving device for at least one light source, comprising:
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a temperature sensor, the temperature sensor operable for sensing a surrounding temperature of the light source and outputting a first control signal in response to the sensed temperature; a first brightness control portion, the first brightness control portion operable for outputting a second control signal based on a first brightness control signal applied from an external source; a signal output portion, the signal output portion operable for receiving the second control signal based on the first brightness control signal;
changing the second control signal based on the first control signal; and
outputting the changed second control signal;an inverter controller, the inverter controller operable for receiving the changed second control signal and outputting a third control signal based on the changed second control signal; a second brightness control portion, the second brightness control portion operable for generating an output signal based on a second brightness control signal; and an electric current sensor operable for sensing an electric current of at least one light source and outputting a corresponding voltage in response to the sensed electric current. - View Dependent Claims (12, 13)
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14. A display device, comprising:
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a display portion, the display portion comprising a display assembly, multiple data and gate tape carrier packages (TCPs) attached to the display assembly, and data and gate printed circuit boards attached to the corresponding data and gate TCPs; and a backlight assembly, the backlight assembly comprising a light source portion having at least one light source, an optical portion disposed between the display assembly and the light source portion for adjusting amount of light from the light source portion, and an inverter portion operable for controlling operation of the light source portion; wherein the inverter portion comprises; a temperature sensor operable for sensing a surrounding temperature of the light source and outputting a first control signal in response to the sensed temperature; a signal output portion operable for receiving a second control signal based on a first brightness control signal applied from an external source;
changing the second control signal based on the first control signal; and
outputting the changed second control signal; andan inverter controller operable for receiving the changed second control signal and outputting a third control signal based on the changed second control signal, wherein the first control signal becomes a low level when the surrounding temperature of the light source is less than a predetermined temperature of the light source, and the second and third control signals are adjusted based on the first control signal, and the second control signal becomes a low level when the first control signal is a low level, and the third control signal is ramped up to a high level for driving the at least one light source. - View Dependent Claims (15, 16, 17, 18)
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Specification