LED driving chip, LED driving circuit and LED display screen
A technology of LED drive and LED lights, applied in the direction of electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of multiple types of chips, inconvenient maintenance, and no current regulation
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Embodiment 1
[0039] The first embodiment of the present invention provides an LED driver chip.
[0040] figure 2 The internal structure diagram of the LED driver chip provided by the first embodiment of the present invention is shown, and for the convenience of description, only the parts related to the embodiment of the present invention are shown.
[0041] An LED driver chip U1, used to drive LED lamps, the LED driver chip U1 includes:
[0042] The serial shift unit 201 receives an external control signal in a single-wire communication manner, and intercepts the control data corresponding to the LED driver chip in the control signal. In this embodiment, the LED driver chip U1 receives an external control signal through a single port Din, which simplifies the control protocol. The external control signal includes control data corresponding to the LED driver chip and other control data.
[0043] Connected to the output end of the serial shift unit 201 , the drive control unit 203 for dr...
Embodiment 2
[0049] The second embodiment of the present invention provides an LED driving circuit.
[0050] image 3 A block diagram of the LED driving circuit provided by the embodiment of the present invention is shown, and for convenience of description, only parts related to the embodiment of the present invention are shown.
[0051] An LED driving circuit is connected with an LED display module 2, the LED display module 2 includes a plurality of LED lamps, and the LED driving circuit includes a plurality of cascaded LED driving chips U1. LED driver chip U1 includes:
[0052] The serial shift unit 201 receives an external control signal CON in a single-wire communication mode, and intercepts the control data corresponding to the LED driver chip in the control signal CON.
[0053] In this embodiment, the control signal CON includes control data corresponding to each LED driver chip U1 (including display data and brightness data), and current data for adjusting output currents of all ...
Embodiment 3
[0085] The third embodiment of the present invention provides an LED display screen, and the LED display screen includes the LED driving circuit provided by the second embodiment.
[0086] In an embodiment of the present invention, the LED driving circuit includes a plurality of cascaded LED driving chips, and the LED driving chip includes: a serial shift unit, a drive control unit, and a shaping output unit; the serial shift The unit receives an external control signal in the form of single-wire communication, and intercepts the control data corresponding to the LED driver chip in the control signal, and the drive control unit drives and controls the LED lamp according to the control data. The shaping output unit shapes the truncated remaining data in the control signal and outputs it. In the embodiment of the present invention, the LED driving circuit only uses one chip to realize the driving control of the LED lamp, which simplifies the circuit structure and reduces the mai...
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