Backlight module with variable lightness and brightness control method

A backlight module and brightness control technology, applied in the field of brightness devices, can solve problems such as excessive driving voltage, circuit out of control when the current is zero, and affecting overall efficiency, so as to achieve product competition superiority, lower cost budget, and avoid circuit runaway effect

Inactive Publication Date: 2008-09-03
INNOLUX CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in order to prevent the driving voltage output by the constant voltage driver circuit 312 from being too large, the excess voltage is consumed by the constant current driver 310
In this way, it will cause waste of power and affect the overall efficiency
[0011] Therefore, a driving device that can not only regulate the magnitude of the current and the conduction time, but also solve the problem of circuit runaway when the current is zero, has fewer components, is small in size, and can improve power efficiency to regulate the brightness of the LED strings of the backlight module is what we need

Method used

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  • Backlight module with variable lightness and brightness control method
  • Backlight module with variable lightness and brightness control method
  • Backlight module with variable lightness and brightness control method

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Embodiment Construction

[0052] Preferred embodiments of the variable brightness backlight module of the present invention will be described in detail below with reference to the accompanying drawings.

[0053] Please refer to Figure 4A , which shows a device block diagram of a variable brightness backlight module according to a preferred embodiment of the present invention. exist Figure 4A Among them, the constant voltage / constant current conversion driver 401 is connected in series with the switch 403, the light emitting diode string 405, and the sensing resistor 404 in sequence, wherein the constant voltage / constant current conversion driver 401 includes a constant current drive module (not shown), a constant A voltage driving module (not shown), and a switching module 406 . In addition, the sensing resistor 404 is electrically connected to the constant voltage / constant current conversion driver 401 , and the controller 402 is electrically connected to the switch 403 and the constant voltage / co...

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Abstract

The invention provides a lightness variable backlight module and method of controlling the lightness. The lightness variable backlight module comprises certain voltage / certain current switching driver, switch, at least one light-emitting diode, a sensing resistance and controller. The certain voltage / certain current switching driver is connected with the switch, at least one light-emitting diode, sensing resistance in series and the sensing resistance also is electrically connected with the certain voltage / certain current switching driver and the controller synchronously controls the switch between the certain voltage drive and certain current drive of the certain voltage / certain current switching driver and the open and the close of switch. When the controller opens the switch, the certain voltage drive is used; when the controller closes the switch, the certain current is used.

Description

technical field [0001] The present invention relates to a device and method for adjusting and controlling light-emitting diodes by constant voltage and constant current conversion, and in particular to a device for regulating and controlling the brightness of light-emitting diodes in backlight modules of flat panel display devices by using constant voltage and constant current conversion and methods. Background technique [0002] Due to the vigorous development of optoelectronic technology, more and more opportunities to come into contact with various communication or electronic products in life, such as: personal digital assistant (personal digital assistant; PDA), mobile phone, notebook computer, desktop monitor, car Use the monitor and so on. Among them, the display device is a common device for these communication or electronic products, so the quality of the display device is closely related to the quality of these communication or electronic products. Therefore, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/36G09G3/34G09G3/20
Inventor 李文中
Owner INNOLUX CORP
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