Backlight circuit and backlight with same

Abstract

The invention provides a backlight circuit and a backlight with the same. The backlight circuit comprises a power supply unit and a plurality of lamp strings, and further comprises a plurality of adjusting units in one-one correspondence with the lamp strings, wherein each lamp string comprises a shining piece group and a feedback resistor which are connected in series; the adjusting units are used for adjusting currents flowing through the lamp strings, so that the electric potential at the cathode terminal of each shining piece group is not larger than a preset voltage value. The power consumption on each lamp string can be reduced, so as to lower the temperature of the backlight circuit.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a backlight circuit and a backlight source including the backlight circuit. Background technique [0002] The backlight driving circuit of the display device includes a power supply, a driver chip and LED lamp strings. The power supply provides voltage, and the driver chip generates a pulse modulation signal (PWM), which can uniformly control the average current flowing through each string of lights. The power supply provides a uniform voltage. Since the voltage drop of each group of LED light strings is different, the current flowing through each LED light string can be kept constant by controlling the voltage drop on the switch tubes connected to the LED light strings. However, when the voltage drop of each LED light string has a large difference, the voltage drop on the corresponding switch tube is relatively large, resulting in a large power consumption of the ...

AI Technical Summary

Problems solved by technology

However, the premise of this method is that changes in the current flowing through a certain string of LED lights lead to changes in the brightness of the LED light strings, and no adjustment is made when the current is at a normal value. The difference of each LED light string itself will still cause a large loss of power consumption on some LED light strings, so this method has certain limitations.

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