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Led driving apparatus and method of controlling luminous power

A light-emitting diode, optical power control technology, applied in the control/regulation system, regulating electrical variables, instruments, etc., can solve problems such as hindering the miniaturization of equipment, increasing heat generation, and increasing power consumption.

Active Publication Date: 2006-04-12
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Driving LEDs with low luminous efficiency requires unnecessary additional power input higher than originally required, which results in increased power consumption
In addition, if the LED is driven with low luminous efficiency, the amount of heat generated by the LED, its driving circuit, and the power supply unit tends to increase, for example, causing a problem that measures for preventing heat generation hinder miniaturization of equipment

Method used

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  • Led driving apparatus and method of controlling luminous power
  • Led driving apparatus and method of controlling luminous power
  • Led driving apparatus and method of controlling luminous power

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Embodiment Construction

[0041] The best mode for carrying out the invention (hereinafter, the embodiment) will be described below.

[0042] First, refer to figure 1 A structural example of a liquid crystal display configured with a light emitting diode (LED) driving device according to an embodiment is described.

[0043] refer to figure 1 , AC power is input to the LCD display from the AC power input terminal tAC.

[0044] AC power is supplied to the power supply circuit 6 from an AC power input terminal tAC, thereby generating a DC voltage. Then, the power supply circuit 6 supplies the generated DC voltage to the signal processing circuit 7 , the panel drive circuit 8 , the controller 2 , and the LED drive circuit 3 as the illustrated DC power supply.

[0045] Further, a video signal is input to the liquid crystal display from the video input terminal tv. The video signal is supplied to the signal processing circuit 7 . The signal processing circuit 7 performs required signal processing on t...

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PUM

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Abstract

A light emitting diode (LED) driving apparatus includes a drive section for driving an LED to emit light, and a control section that controls a driving current supplied from the drive section to the LED. The control section implements luminous power control by controlling an ON / OFF ratio of the driving current if a target value of luminous power of the LED is smaller than a predetermined value. The control section implements luminous power control by controlling a level of the driving current if the target value is equal to or larger than the predetermined value.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter of Japanese Patent Applications JP 2004-296148 and JP 2005-227965 filed in the Japan Patent Office on Oct. 8, 2004 and Aug. 5, 2005, respectively, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a light emitting diode (LED) driving device and a method of controlling light power. Background technique [0004] A display that cannot emit light by itself (for example, a liquid crystal display) is equipped with a backlight. As such a backlight, a backlight using a cold-cathode tube as a light source has been known. In addition, in recent years, backlights using light emitting diodes (LEDs) that consume less power have also been known. [0005] Regarding the method of controlling the luminous power of such a backlight including LEDs, two methods have been known. One is a current value control method f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/10G05F1/46G05F1/56
Inventor 大山义树
Owner SAMSUNG ELECTRONICS CO LTD