LED (light-emitting diode) constant current driving chip and output current control method thereof

A constant current drive chip and current control technology, applied in the direction of energy-saving control technology, electric light source, electric lamp circuit layout, etc., can solve the problems of LED control system fast response capability limitation, data transmission efficiency decline, system function is not easy to expand, etc., to achieve The effect of easy expansion of functions, improvement of response performance, and improvement of utilization rate

Inactive Publication Date: 2012-09-19
SHENZHEN MOONCELL ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current control data of the traditional LED constant current driver chip is transmitted serially through the shift register module step by step. Since the shift register module uses words as the processing unit, the longer the word length, the longer the processing time; usually the current control data The number of digits is smaller than the word length, so the transmission of data smaller than the word length also needs to go through the transmission time of the entire word, which limits the transmission speed of data information smaller than the word length, reduces the data transmission efficiency, and the LED control system The rapid response The capacity is also limited, and the system function is not easy to expand

Method used

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  • LED (light-emitting diode) constant current driving chip and output current control method thereof
  • LED (light-emitting diode) constant current driving chip and output current control method thereof
  • LED (light-emitting diode) constant current driving chip and output current control method thereof

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] figure 1 It is the internal schematic diagram of the existing LED constant current drive chip. It can be seen from the figure that the control register module obtains the control data from the parallel register module, and the data in the parallel register module is obtained from the serial shift register module. , while the current control data is serially input from the data input pin, so the control delay is long.

[0026] figure 2 It is the timing diagram of the existing transmission OUT0-OUT15 (the chip output takes 16 bits as an example) control data data. In the figure, the switch state data of OUT0-OUT15 is transmitted with 16 clock pulses.

[0027] image 3 It is the timing diagram of the existing transmission current control data. In the figure, the current control data is still transmitted with 16 clock pulses. The differe...

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PUM

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Abstract

The invention discloses an LED (light-emitting diode) constant current driving chip and an output current control method thereof. The LED constant current driving chip comprises an OE (output enable) pin, a data LE (latch enable) pin, a clock CLK pin, a DI (data input) pin, a DO (data output) pin and N driving output OUT1-OUT N pins; the control data of the N driving output OUT1-OUT N pins are input from the DI pin so as to be output from the DO pin through a serial shift module. The LED constant current driving chip is characterized in that any two of the OE pin, the data LE pin and the clock CLK pin can be used as a current control signal input pin, are used for inputting a current control signal, and can control the output currents of the N driving output OUT1-OUT N pins through a control register module and a current regulation module.

Description

technical field [0001] The invention relates to an LED drive control technology, in particular to an LED constant current drive chip with a quick setting function and a control data setting method thereof. Background technique [0002] The display screen is one of the important media for people to receive various information. As a multimedia display terminal, the display screen has an important index, that is, the fast response capability of the display screen. The current control data of the traditional LED constant current driver chip is transmitted serially through the shift register module step by step. Since the shift register module uses words as the processing unit, the longer the word length, the longer the processing time; usually the current control data The number of digits is smaller than the word length, so the transmission of data smaller than the word length also needs to go through the transmission time of the entire word, which limits the transmission speed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32H05B37/02
CPCY02B20/42Y02B20/40
Inventor 胡家同
Owner SHENZHEN MOONCELL ELECTRIC
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