Light emitting diode backlight source, liquid crystal display and driving method

Abstract

The invention provides a light emitting diode backlight source, a liquid crystal display and a driving method. The light emitting diode backlight source comprises at least one light emitting array and a driving circuit, the light emitting array is connected between the first wiring end and the second wiring end in parallel, and the driving circuit is used for providing the voltage difference for the position between the first wiring end and the second wiring end to drive positive light emitting diodes or negative light emitting diodes in the light emitting array to emit light. The driving circuit comprises a sequence signal input end which is used for receiving sequence control signals for controlling light emitting time of the positive light emitting diodes and the negative light emitting diodes, the second wiring end is connected to the ground, and the driving circuit is used for providing the positive driving voltage for driving the positive light emitting diodes to emit light and providing the negative driving voltage for driving the negative light emitting diodes to emit light for the first wiring end under control of the sequence control signals.

Description

[0001] This application is a divisional application of the patent application with the application number 201010238605.6 and the title of the invention "LED backlight source, liquid crystal display and driving method" submitted on July 23, 2010. technical field [0002] The invention relates to a backlight source technology of a liquid crystal display, in particular to a light emitting diode backlight source, a liquid crystal display and a driving method. Background technique [0003] Existing liquid crystal displays can use Light Emitting Diodes (Light Emitting Diode, LED for short) as their backlight sources, which mainly include side-lit type and direct-lit type. The existing LED backlight is a point light source. In the edge-lit backlight, a plurality of LEDs are adjacently arranged on a straight line; in the direct-lit backlight, a plurality of LEDs are evenly arranged on a plane. [0004] Such as figure 1 As shown, the existing LED backlight is an electrostatic sensit...

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Problems solved by technology

but figure 2 The disadvantage of the circuit shown is: since the zener diode only plays the role of electrostatic protection in the circuit and does not emit light, if each LED is connected in parallel with a zener diode for electrostatic protection, the cost of the protection circuit will be increased, and, Since half of the diode devices in the backlight do not have the effect of emitting light, it is prone to firefly defects

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