Common anode display screen control circuit

Abstract

The invention discloses a common anode display screen control circuit, which comprises a common anode power supply, an RGB-LED lamp and a driving module, power is supplied through the common-anode power supply, the power consumption of the red light LED constant-current driving chip can be effectively reduced, and the energy-saving effect is achieved.

Description

technical field [0001] The invention relates to the field of display screens, in particular to a common anode display screen control circuit. Background technique [0002] At present, the LED lamps used in full-color LED displays are RGB-LED lamps, among which the red LED lamps, green LED lamps and blue LED lamps in the RGB-LED lamps generally adopt the common anode connection method, that is, the RGB-LED lamps The anodes of the red LED light, green LED light and blue LED light are connected in parallel, and the negative electrodes of the red light LED light, green light LED light and blue light LED light are respectively connected to the red LED constant current driver chip and the green LED constant current driver chip. The current driver chip and the blue LED constant current driver chip, the ground terminals of the red LED constant current driver chip, the green LED constant current driver chip and the blue LED constant current driver chip are connected together and grou...

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Problems solved by technology

[0002] At present, the LED lamps used in full-color LED displays are RGB-LED lamps, among which the red LED lamps, green LED lamps and blue LED lamps in the RGB-LED lamps generally adopt the common anode connection method, that is, the RGB-LED lamps The anodes of the red LED light, green LED light and blue LED light are connected in parallel, and the negative electrodes of the red light LED light, green light LED light and blue light LED light are respectively connected to the red LED constant current driver chip and the green LED constant current driver chip. The current driver chip and the blue LED constant current driver chip, the ground terminals of the red LED constant current driver chip, the green LED constant current driver chip and the blue LED constant current driver chip are connected together and grounded, and the red LED constant current driver chip , green LED constant current driver chip and blue LED constant current driver chip respectively control the luminous intensity of red LED lights, green LED lights and blue LED lights; -The anodes of the red LED lamp, green LED lamp and blue LED lamp in the LED lamp provide the same power supply voltage, which is generally 4.5~5V, which makes the red LED lamp and red LED constant current drive chip The total voltage is equal to the total voltage of the green LED lamp and the green LED constant current driver chip, and also equal to the total voltage of the blue LED lamp and the green LED constant current driver chip, but because the average forward voltage of the red LED lamp is about The average forward voltage of the blue LED and green LED is about 3V, which will lead to a larger voltage drop of the red LED constant current driver chip, which will cause the red LED constant current driver chip to heat up. Large, high power consumption, and the heating of the red LED constant current driver chip will affect the display effect of the display

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