Light-emitting diode (LED) constant current driving circuit, driving chip and control method of driving chip

Abstract

The invention relates to the technical field of the control of a light-emitting diode (LED) lamp, and provides an LED constant current driving circuit, a driving chip and a control method of the driving chip. The control method of the driving chip comprises the following steps of: judging whether a data frame is received or not, if yes, executing a step of extracting corresponding display data of the level from the received data frame and controlling the LED lamp to display according to the acquired display data of the level; and if not, generating display data according to a built-in effect algorithm, acquiring the display data of the level from the generated display data, and controlling the LED lamp to display according to the acquired display data of the level; judging whether the driving chip works in an external controller control state or a built-in display effect control state or not according to the received data frame, subsequently and automatically switching the driving chip into the built-in display effect state when external data is not received. Therefore, most driving chips of the series display system are ensured to work at display states, and subsequent maintenance is facilitated or reduced.

Description

technical field [0001] The invention relates to the technical field of LED lamp control, in particular to an LED constant current drive circuit, a drive chip and a control method thereof. Background technique [0002] At present, the driver chips of the serial display system in the prior art are connected in series step by step, such as figure 1 As shown, the display data read by the driver chip is transmitted step by step from the previous driver chip to the next driver chip, that is, when the Nth driver chip receives the data stream output by the N-1 driver chip, it intercepts the current level (Nth stage) required display data to control the connected lamps to display corresponding effects, and then output the remaining data to the display device of the N+1th stage driver chip. When the external controller is damaged or a driver chip in the serial display system is damaged (the DOUT port has no output), the subsequent chip cannot receive data, and the subsequent chip can...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an LED constant current drive circuit, a drive chip and a control method thereof, aiming to solve the problem that when a certain drive chip in the serial display system is damaged in the prior art, the subsequent drive chip cannot receive its The problem that the corresponding data at this level makes the LED lights connected to it unable to display

Images