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

Active Publication Date: 2016-06-08
SHENZHEN SUNMOON MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide an LED drive circuit, aiming to solve the problem of the traditional LED display drive scheme using many types of chips, complex circuits, resulting in inconvenient troubleshooting and the traditional LED display drive scheme control protocol. Complicated, the signal is easy to interfere, and there are no problems with functions such as current regulation

Method used

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  • LED driving chip, LED driving circuit and LED display screen
  • LED driving chip, LED driving circuit and LED display screen
  • LED driving chip, LED driving circuit and LED display screen

Examples

Experimental program
Comparison scheme
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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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Abstract

The invention belongs to the field of LED driving control, and provides an LED driving chip, an LED driving circuit and an LED display screen. The LED driving circuit comprises multiple cascaded LED driving chips, and each LED driving chip comprises a serial-shift unit, a driving control unit and a shaping output unit; each serial-shift unit receives an external control signal in a single-line communication mode and intercepts control data, corresponding to the LED driving chip, in the control signal, the driving control units conduct driving control on an LED lamp according to the control data, and the shaping output units shape rest data in the control signal and output the shaped data. According to the LED driving chip, the LED driving circuit and the LED display screen, driving control over the LED lamp in the LED driving circuit can be achieved only using one kind of chips, the circuit structure is simplified, the maintenance cost is reduced, driving control is conducted on the LED driving circuit in the single-line communication mode, a communication protocol is simplified, and the cascading error is reduced.

Description

technical field [0001] The invention belongs to the field of LED driving control, and in particular relates to an LED driving chip, an LED driving circuit and an LED display screen. Background technique [0002] LED (Light Emitting Diode) display screen is a display screen that displays various information such as text, graphics, images, animations, market prices, videos, video signals, etc. by controlling the display mode of LEDs. [0003] The traditional LED display driving scheme is realized by using LED driver chip 595 and some other auxiliary chips. For example, a P10 monochrome module needs 16 SM74HC595 chips, 4 MW4953 chips, 1 SM74HC245 chip and 1 SM74HC138 chip. These 4 types of chips are combined to realize the drive control of the LED display, such as figure 1 As shown, the external control signal (including line control signal A / B, data signal SER and system control signal SCK / RCK) is output after being amplified and shaped by the chip SM74HC245. Among them, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 李照华李国添符传汇孙武
Owner SHENZHEN SUNMOON MICROELECTRONICS
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