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Driving current control circuit and operating method thereof

A technology for driving current and controlling circuits, which is applied in the layout of electric lamp circuits, electric light sources, lighting devices, etc., and can solve the problems of reducing the life cycle of light-emitting diodes and overheating of light-emitting diodes.

Inactive Publication Date: 2013-12-04
HIMAX ANALOGIC INC
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AI Technical Summary

Problems solved by technology

Traditionally, a rated current is used to drive these light-emitting diode strings to provide a white light backlight for liquid crystal display for image display. However, if these light-emitting diode strings are driven with an overdrive current exceeding the rated current to provide higher brightness When the backlight is used, the image displayed by the LCD will be brighter due to the increase in brightness
However, working in this mode for a long time will cause the LED to overheat, which will reduce the life cycle of the LED

Method used

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  • Driving current control circuit and operating method thereof
  • Driving current control circuit and operating method thereof
  • Driving current control circuit and operating method thereof

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Embodiment Construction

[0027] The following is a detailed description of preferred embodiments of the present invention with the accompanying drawings. The following descriptions and diagrams use the same reference numerals to indicate the same or similar elements, and repeated descriptions of the same or similar elements are omitted.

[0028] figure 1 A schematic diagram of a LED driving current control circuit according to a preferred embodiment of the present invention is shown. Wherein the LED driving current control circuit 103 is mainly used to adjust the driving current output by the driving element 102 to the LED module 101, so as to reduce the overdrive current supplied to the LED module 101 in real time when the LED module 101 is overheated, and maintain the normal The driving current drives the LED module 101 , and at the same time, when the temperature of the LED module 101 recovers, the LED module 101 is driven again with an overdriving current. The light-emitting diode module 101, for...

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Abstract

The invention provides a control circuit that is used for controlling a driving current of a driving element. The control circuit comprises a temperature detector, a switch coupled to the temperature detector, and a resistor string coupled with the switch and the driving element. The temperature detector can generate a control signal according to the temperature and the control signal can control the state of the switch. When the control signal controls the switch to be in a conduction state, the resistor string has a first resistance value; and when the control signal controls the switch to be in a cut-off state, the resistor string has a second resistance value. And the driving element generates a driving current according to the first resistance value or the second resistance value.

Description

technical field [0001] The present invention relates to a control circuit, in particular to a light emitting diode driving current control circuit and its operation method. Background technique [0002] A liquid crystal display (LCD) is widely used as a display device because it can display images of excellent quality while using a small amount of power. However, the liquid crystal molecules in a liquid crystal display cannot emit light by themselves. Liquid crystal molecules must transmit light to light up to display text and images clearly and unambiguously. Generally speaking, a backlight is used as a light source. Recently, under the requirement of environmental protection, light-emitting diodes have gradually replaced CCFLs as backlight sources for liquid crystal display devices. [0003] The backlight of a liquid crystal display using light emitting diodes generally includes a plurality of light emitting diode strings, which are regularly arranged to form a pluralit...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 曾冠仁
Owner HIMAX ANALOGIC INC
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