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Backlight circuit, backlight panel and light emitting diode driver

A light-emitting diode and backlight technology, which is applied in the field of light-emitting diode drivers and backlight circuits, can solve the problems of increasing the cost of liquid crystal displays and LED drivers, and achieve the effect of reducing costs

Inactive Publication Date: 2012-08-08
BEIJING BOE OPTOELECTRONCIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventors found that a backlight board contains many LED strings in the prior art, and each string of LED strings needs to be connected to an OP-AMP, so when the number of LED strings on the backlight board is too large, the required OP -The number of AMPs will also be very large, so this will greatly increase the cost of the LED driver. Since the LCD must include an LED driver, the cost of the LCD will also increase

Method used

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  • Backlight circuit, backlight panel and light emitting diode driver
  • Backlight circuit, backlight panel and light emitting diode driver
  • Backlight circuit, backlight panel and light emitting diode driver

Examples

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Embodiment

[0034] An embodiment of the present invention provides a backlight circuit, the circuit diagram of the backlight circuit is as follows image 3 As shown, it includes a pulse width modulation PWM signal transmitter, a voltage follower OP-AMP21, and an LED string 11. The OP-AMP21 is used to output current to the LED string, and two current output ports connected to the same OP-AMP21 The switch circuits are respectively referred to as the first switch circuit 41 and the second switch circuit 42. The first switch circuit 41 and the second switch circuit 42 are switches of different types. For example, when the first switch circuit is a P-type switch circuit When, the second switch circuit is an N-type switch circuit; or, when the first switch circuit is an N-type switch circuit, the second switch circuit is a P-type switch circuit; different types of switch circuits are selected for Ensure that when the two switch circuits receive the same PWM signal from the PWM signal transmitte...

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PUM

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Abstract

The invention relates to the application electronic technology field, especially to a backlight circuit, a backlight panel and a light emitting diode (LED) driver, so that a problem that how to reduce liquid crystal display (LCD) cost can be solved. The backlight circuit includes an LED driver that consists of OP-AMPs and a pulse width modulation (PWM) signal transmitter. Besides, the backlight circuit comprises first switching circuits, second switching circuits and the PWM signal transmitter. Specifically, current input terminals of the first switching circuits are connected with output terminals of the OP-AMPs and current output terminals of the first switching circuits are connected with a first LED string; current input terminals of the second switching circuits are connected with the output terminals of the OP-AMPs and current output terminals of the second switching circuits are connected with a second LED string; and the PWM signal transmitter is used for controlling alternate connection and disconnection of the first switch circuits and the second switch circuits. Therefore, the method provided by the invention enables cost of an LCD to be lowered by reducing the number of the OP-AMPs.

Description

technical field [0001] The present invention relates to the technical field of applied electronics, in particular to a backlight circuit, a backlight and a light emitting diode (Light Emitting Diode, LED) driver. Background technique [0002] At present, a liquid crystal display (Liquid Crystal Display, LCD) displays color images by operating a backlight panel that emits a white light source; the white light source of the backlight panel is emitted by a light emitting diode (Light Emitting Diode, LED), such as figure 1 As shown, the backlight panel includes multiple strings of LED strings 12 made up of LEDs 11, and an LED driver 13 that makes the LED strings 12 emit light; wherein each LED string 12 contains the same number of LEDs 11 that are connected in series, and the LED driver 13 supplies each LED The string 12 supplies power to ensure that the LEDs 11 on each LED string 12 emit light normally. [0003] The internal structure of the LED driver 13 in the prior art is a...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09F9/35H05B37/02H05B44/00
CPCH05B33/0815G09G2320/064G09G3/36H05B33/0818G09G2330/02G09G3/342H05B33/0827H05B33/0803H05B45/46H05B45/325H05B45/3725
Inventor 肖利军
Owner BEIJING BOE OPTOELECTRONCIS TECH CO LTD