Patent ID: 9402288
Filing Date: 2016-07-26
CPC Classification: G02F,G09G,H05B

Claim Text:
1. A backlight of a liquid crystal display device, comprising: a LED lamp bead group, including a plurality of strings of LED lamp bead which are opposite in term of positive and negative directions; a backlight driving module, an output end of which is electrically connected to the LED lamp bead group to output a voltage signal and a current signal to drive the LED lamp bead group, wherein the voltage signal is configured as more than one serials of periodic square-wave signal, under the action of which a string of LED lamp bead of positive direction and a string of LED lamp bead of negative direction emit light in an alternate manner, and the brightness of emitted light is determined by the magnitude of the current signal, wherein the voltage signal output by the backlight driving module is configured as two serials of periodic square-wave signal, the amplitudes of which two are same and greater than or equal to the turn-on voltage of the string of LED lamp bead, and the frequencies of which two are same but have a phase difference of half period; the strings of LED lamp bead of positive direction are connected in parallel to each other, wherein one end of each string of positive direction is electrically connected to a first output end of the backlight driving module and the other end thereof is electrically grounded, so as to receive a first serial of periodic square-wave signal; and the strings of LED lamp bead of negative direction are connected in parallel to each other, wherein one end of each string of negative direction is electrically connected to a second output end of the backlight driving module and the other end thereof is electrically grounded, so as to receive a second serial of periodic square-wave signal.