Driver for driving backlight module and driving method

A backlight module and driver technology, applied in the direction of instruments, light sources, electric light sources, etc., can solve the problems of inability to effectively improve the characteristics of wireless wide-area networks, and inability to effectively reduce fluctuation interference

Inactive Publication Date: 2011-10-19
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method cannot effectively reduce the fluctuation interference, nor can it effectively improve the characteristics of the wireless wide area network

Method used

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  • Driver for driving backlight module and driving method
  • Driver for driving backlight module and driving method
  • Driver for driving backlight module and driving method

Examples

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Embodiment Construction

[0036] In order to make the description of the present invention more detailed and complete, reference may be made to the attached drawings and various embodiments described below, and the same numbers in the drawings represent the same or similar elements. In addition, well-known elements and steps have not been described in the embodiments in order to avoid unnecessary limitations of the present invention.

[0037] In the embodiments and the scope of the patent application, "a" and "the" can generally refer to a single or a plurality, unless there is a special limitation on the articles in the context. Moreover, in the embodiments and scope of the patent application, unless otherwise specified herein, the "in" mentioned also includes the meanings of "in" and "on" .

[0038] Although the terms "first" and "second" can be used to describe different elements, these elements should not be limited by the terms, and the terms are only used to distinguish them from other elements....

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PUM

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Abstract

The invention discloses a driver for driving a backlight module and a driving method. The backlight module comprises a plurality of light-emitting diode (LED) bunches. The driver comprises a random frequency multiplexer, a pulse width modulating controller and a switch control circuit. The random frequency multiplexer receives one or more pulse width modulating signals and correspondingly outputs plural random frequency signals. The pulse width modulating dimming controller which is electrically coupled to the random frequency multiplexer receives the random frequency signals and correspondingly outputs plural driving signals so as to respectively drive each LED bunch. The switch control circuit which is electrically coupled to the random frequency multiplexer is used for receiving random frequency signals and correspondingly outputs plural switch control signals to a booster converter so as to respectively adjust the working period of each driving signal and making each LED bunch emit light with expected brightness in a predetermined time period.

Description

technical field [0001] The present invention relates to a light emitting diode (LED) backlight device, and more particularly to a driver and method for driving a light emitting diode (LED) backlight device with random PWM dimming control. Background technique [0002] LED backlights play an important role in LCDs due to their substantially long operating lifetime, superior brightness maintenance, color rendering with improved reliability, and low operating voltage with fast start-up time and precisely controlled intensity. The use is becoming more and more common. [0003] Light-emitting diodes are current-driven devices in which light is generated by the recombination of holes and electrons injected in the semiconductor junction. Therefore, the brightness of light-emitting diodes is usually controlled by controlling the forward current flowing through the device. Take control. One method for driving LEDs is known as Pulse Width Modulation (PWM) dimming control, which is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/32H05B44/00
CPCH05B45/10Y02B20/30H05B45/325H05B45/38
Inventor 黄竑旻江佳璁
Owner AU OPTRONICS CORP
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