CN102682701B - A kind of LED display constant-current driving control system and output current control method thereof - Google Patents
A kind of LED display constant-current driving control system and output current control method thereof Download PDFInfo
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- CN102682701B CN102682701B CN201210151180.4A CN201210151180A CN102682701B CN 102682701 B CN102682701 B CN 102682701B CN 201210151180 A CN201210151180 A CN 201210151180A CN 102682701 B CN102682701 B CN 102682701B
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Abstract
The invention discloses a kind of LED display constant-current driving control system and output current control method thereof, LED display constant-current driving control system includes that the LED constant current driving chip of N number of cascade, clock CLK end, data latch LE end, output enables OE end, the clock CLK pin of described N number of LED constant current driving chip is connected with each other, and tandem is to described clock CLK end；The data of described N number of LED constant current driving chip latch LE pin and are connected with each other, and LE end is latched in tandem to described data；The output of described N number of LED constant current driving chip enables OE pin and is connected with each other, and tandem enables OE end to described output；More than any two terminal as current controling signal input terminal in described output enable OE end, data latch LE end, three terminals of clock CLK end, in order to input current control signal, control the output OUT1-OUTM pin output electric current of described N number of LED constant current driving chip.
Description
Technical field
The present invention relates to a kind of LED Drive Control Technique, particularly relate to a kind of have the constant-current LED of function be quickly set show
Display screen driving control system and control data arrangement method thereof.
Background technology
Display screen is one of people's important medium receiving various information.As a kind of multimedia display terminal, display screen
There are an important indicator, the i.e. capability of fast response of display screen.The current controling signal of traditional LED constant current driving chip is all adopted
With the serial transmission step by step of shift LD module, owing to shift LD module is that word length is the longest, during process using word as processing unit
Between the longest；Generally current controling signal figure place is both less than word length, and so transmitting also needs through whole word less than the data of word length
Delivery time, thus limit the transmission speed of the data message less than word length, particularly drive core when multiple LED constant current
During sheet cascade, postpone to become apparent from, cascade the most, postpone the most serious so that data transmission efficiency declines, and LED shows control
The capability of fast response of system is also restricted, and systemic-function is difficult to extension.
Summary of the invention
In view of this, it is necessary to for the problems referred to above, it is provided that a kind of LED display constant-current driving control system and output thereof
Current control method.
The present invention is by the following technical solutions: a kind of LED display constant-current driving control system, including the LED of N number of cascade
Constant-current driven chip, clock CLK end, data latch LE end, output enables OE end, the wherein number of the first LED constant current driving chip
It is connected according to the data input DI pin of output DO pin and the second LED constant current driving chip, the number of the second LED constant current driving chip
It is connected according to the data input DI pin of output DO pin and the 3rd LED constant current driving chip, is so cascaded to n-th LED and drives
Chip；The clock CLK pin of described N number of LED constant current driving chip is connected with each other, and tandem is to described clock CLK end；Described N number of
The data of LED constant current driving chip latch LE pin and are connected with each other, and LE end is latched in tandem to described data；Described N number of LED constant current
The output of driving chip enables OE pin and is connected with each other, and tandem enables OE end to described output；Described N number of LED constant current drives core
Respective M the output pin OUT1-OUTM of sheet is connected with its LED array each controlled；Described N number of LED constant current driving chip
Power vd D pin receive on power supply；The ground GND pin of described N number of LED constant current driving chip receives power supply on the ground；Described N number of
LED constant current driving chip respective outer meeting resistance REXT pin receives power supply on the ground through respective current setting resistance；Described
More than any two terminal as current controling signal in output enable OE end, data latch LE end, three terminals of clock CLK end
Input terminal, in order to input current control signal, controls the output OUT1-OUTM pin of described N number of LED constant current driving chip
Output electric current.
In the LED driving control system of the present invention, described N number of LED constant current driving chip respective output OUT1-
The controlled state data of OUTM pin input the input of DI end from the data of described first LED constant current driving chip.
In the LED driving control system of the present invention, described current controling signal includes clock and current control data.
Present invention also offers the output current control method of a kind of LED display constant-current driving control system, described LED
Display screen constant-current driving control system includes that the LED constant current driving chip of N number of cascade, clock CLK end, data latch LE end, defeated
Going out to enable OE end, wherein the data of the first LED constant current driving chip export DO pin and the data of the second LED constant current driving chip
Input DI pin is connected, the data output DO pin of the second LED constant current driving chip and the data of the 3rd LED constant current driving chip
Input DI pin is connected, and is so cascaded to n-th LED drive chip；The clock CLK pin of described N number of LED constant current driving chip
Being connected with each other, tandem is to described clock CLK end；The data of described N number of LED constant current driving chip latch LE pin and are connected with each other,
Tandem latches LE end to described data；The output of described N number of LED constant current driving chip enables OE pin and is connected with each other, and tandem is arrived
Described output enables OE end；Respective M the output pin OUT1-OUTM automatic control each with it of described N number of LED constant current driving chip
The LED array of system is connected；The power vd D pin of described N number of LED constant current driving chip is received on power supply；Described N number of LED constant current
The ground GND pin of driving chip receives power supply on the ground；Described N number of LED constant current driving chip respective outer meeting resistance REXT pin
Power supply is received on the ground through respective current setting resistance；During input current control signal, enable OE end, data with described output
Latch any two in LE end, three terminals of clock CLK end and, with upper terminal input current control signal, control described N number of LED permanent
The output electric current of the output OUT1-OUTM pin of stream driving chip.
In the above-mentioned methods: current controling signal includes clock and current control data；Described LED display constant-current driving
Include during control system work that non-electric current adjusts state and electric current adjusts two kinds of duties of state；
Adjust state at non-electric current, if current control data is high when rising edge clock signal, then enters electric current and adjust
Whole state, after entering electric current adjustment state, current control data is written in described LED display constant-current driving control system
Each LED constant current driving chip；After completing, described LED display constant-current driving control system exits electric current and adjusts state；Described
Each LED constant current driving chip in LED display constant-current driving control system realizes described according to described current control data
N number of driving of each LED constant current driving chip in LED display constant-current driving control system exports the defeated of OUT1-OUTM pin
Go out the regulation of electric current.
Said method can also be: current controling signal includes clock and level；Described LED display constant-current driving controls
Include during system work that non-electric current adjusts state and electric current adjusts two kinds of duties of state；
Adjusting state at non-electric current, if when rising edge clock signal, level is high, then enter electric current and adjust state,
After entering electric current adjustment state, each LED constant current driving chip in described LED display constant-current driving control system passes through clock
Level width is counted；After completing, each LED constant current driving chip in described LED display constant-current driving control system exits
Electric current adjusts state；Each LED constant current driving chip in described LED display constant-current driving control system realizes according to count value
N number of driving output OUT1-OUTM of each LED constant current driving chip in described LED display constant-current driving control system is drawn
The regulation of the output electric current of foot.
The invention has the beneficial effects as follows: owing to the control data of output electric current just need not obtain after chip step by step serial,
The word length of the most uncontrolled word limits so that electric current controls speed and speeds, and it is the most that driving chip cascades, and effect is the brightest
Aobvious, which enhance the utilization rate of hardware, make the function of system easily extend, the response performance of LED control system is also changed
Kind.
Accompanying drawing explanation
Fig. 1 is LED display constant-current driving control system schematic diagram (chip exports as a example by 16)；
Fig. 2 is that transmission OUT0-OUT15(chip of the prior art exports as a example by 16) control Data Data sequential
Figure；
Fig. 3 is transmission current controling signal sequential chart of the prior art；
Fig. 4 is the sequential chart of the first embodiment output current control method of the present invention；
Fig. 5 is the sequential chart of the second embodiment output current control method of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further detailed.
Fig. 1 is LED driving control system schematic diagram (chip exports as a example by 16), it can be seen that N number of LED
Constant-current driven chip cascades, wherein the data output pins DO of the first LED constant current driving chip and the second LED constant current driving chip
Data-out pin DI be connected, the data output pins DO of the second LED constant current driving chip and the 3rd LED constant current driving chip
Data-out pin DI be connected, be so cascaded to n-th LED drive chip；The clock CLK of N number of LED constant current driving chip draws
Foot is connected with each other, and tandem is to clock CLK end；The data of N number of LED constant current driving chip latch LE pin and are connected with each other, and tandem is arrived
Data latch LE end；The output of N number of LED constant current driving chip enables OE pin and is connected with each other, and tandem enables OE end to output；N
Respective M the output pin OUT1-OUTM of individual LED constant current driving chip is connected with LED array；N number of LED constant current driving chip
Power pins VDD receive on power supply；The ground pin GND of N number of LED constant current driving chip receives power supply on the ground；N number of LED constant current
Driving chip respective outer meeting resistance pin REXT receives power supply on the ground through respective current setting resistance；Input current controls
During signal, enable more than any two terminal conduct electricity in OE end, data latch LE end, three terminals of clock CLK end with output
Flow control signals input terminal, in order to input current control signal, controls the output pin of N number of LED constant current driving chip
The output electric current of OUT1-OUTM；Due to current controling signal no longer from data input pin DI serial input, but the directly used time
Clock CLK end, data latch LE end, output enables OE end and transmits, so current controling signal arrives each cascade the most simultaneously
LED drive chip；Fig. 2, Fig. 3 show prior art, it can be seen that if there being 4 chip-in series, need 64 CLK ability
Complete current settings；So use the present invention just than current controling signal in prior art shown in Fig. 3 from data input pin DI level
Connection serial input to improve system responsiveness energy, to take full advantage of hardware resource the most much.
In such scheme, the controlled state data of N number of LED constant current driving chip respective output pin OUT1-OUTM
Input from the data input pin DI of the first LED constant current driving chip.
In such scheme, with following control method control output electric current:
During input current control signal, enable in OE end, data latch LE, three terminals of clock CLK end any with output
Two or more terminal, as current controling signal input, controls the output pin OUT1-OUTM of N number of LED constant current driving chip
Output electric current.
In the above-mentioned methods, may is that
Current controling signal includes clock and current control data: wrap during the work of LED display constant-current driving control system
Include non-electric current and adjust state and electric current adjustment two kinds of duties of state；
Adjust state at non-electric current, if current control data is high when rising edge clock signal, then enters electric current and adjust
Whole state.After entering electric current adjustment state, follow-up current control data is written in LED display constant-current driving control system
Each LED constant current driving chip, after completing, LED display constant-current driving control system exits electric current and adjusts state；LED display is permanent
In stream driving control system, each LED constant current driving chip realizes controlling LED display constant-current driving according to current control data
The regulation of the output electric current of N number of driving output pin OUT1-OUTM of each LED constant current driving chip in system.
As shown in Figure 4, having as a example by 6bit by current controling signal, system includes two kinds of duties: (1) non-electric current adjusts
State, (2) electric current adjusts state.
If LE is high (D0 is height) time under non-electric current adjustment state at CLK rising edge, enters electric current and adjust state,
After entering electric current adjustment state, 6 follow-up bit are written into LED constant current driving chip, and LED constant current driving chip is according to these 6
The output electric current of OUT1-OUTN is adjusted by bit.This method at most can recall 64 kinds of current values.Shape is adjusted at electric current
State returns to non-electric current after 7 CLK and adjusts state.
In the above-mentioned methods, it is also possible to be:
Current controling signal includes clock and level；
Include during the work of LED display constant-current driving control system that non-electric current adjusts state and electric current adjusts two kinds of works of state
Make state；
Adjusting state at non-electric current, if when rising edge clock signal, level is high, then enter electric current and adjust shape, enter
After entering electric current adjustment state, in LED display constant-current driving control system, each LED constant current driving chip passes through clock to level width
Degree counting, after completing, in LED display constant-current driving control system, each LED constant current driving chip exits electric current and adjusts state；LED
In display screen constant-current driving control system, each LED constant current driving chip realizes LED display constant-current driving control according to count value
The regulation of the output electric current of N number of driving output pin OUT1-OUTM of each LED constant current driving chip in system processed.
As it is shown in figure 5, system includes two kinds of duties: (1) non-electric current adjusts state, and (2) electric current adjusts state.
If LE is height time under non-electric current adjustment state at CLK rising edge, enters electric current and adjust state, enter electric current
After adjustment state, by CLK, the high level of LE is counted, LED constant current driving chip according to count value to OUT1-OUTN
Output electric current be adjusted.This method at most can recall 6 kinds of current values.Electric current adjust state after 7 CLK extensive
Arrive non-electric current again and adjust state.
Embodiment described above only have expressed the several embodiments of the present invention, but can not therefore be interpreted as this
The restriction of bright the scope of the claims.It should be pointed out that, for the person of ordinary skill of the art, without departing from present inventive concept
On the premise of, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, patent of the present invention
Protection domain should be as the criterion with claims.
Claims (5)
1. a LED display constant-current driving control system, including the LED constant current driving chip of N number of cascade, clock CLK end, number
According to latch LE end, output enable OE end, it is characterised in that: wherein the first LED constant current driving chip data output DO pin with
The data input DI pin of the second LED constant current driving chip is connected, the data of the second LED constant current driving chip output DO pin with
The data input DI pin of the 3rd LED constant current driving chip is connected, and is so cascaded to n-th LED drive chip；Described N number of LED
The clock CLK pin of constant-current driven chip is connected with each other, and tandem is to described clock CLK end；Described N number of LED constant current driving chip
Data latch LE pin be connected with each other, tandem to described data latch LE end；The output of described N number of LED constant current driving chip
Enabling OE pin to be connected with each other, tandem enables OE end to described output；Respective M the output of described N number of LED constant current driving chip
The LED array that pin OUT-OUTM each controls with it is connected；The power vd D pin of described N number of LED constant current driving chip connects
On power supply；The ground GND pin of described N number of LED constant current driving chip receives power supply on the ground；Described N number of LED constant current driving chip
Respective outer meeting resistance REXT pin receives power supply on the ground through respective current setting resistance；Described output enables OE end and institute
State data latch two terminals of LE end and enable OE end and described clock as current controling signal input terminal or described output
Two terminals of CLK end enable OE end as current controling signal input terminal or described output, described data latch LE end and institute
State three terminals of clock CLK end as current controling signal input terminal, in order to input current control signal, control described N number of
The output electric current of the output OUT1-OUTM pin of LED constant current driving chip, described current controling signal includes clock and level.
LED display constant-current driving control system the most according to claim 1, it is characterised in that described N number of LED constant current
The controlled state data of driving chip respective output OUT1-OUTM pin are from the data of described first LED constant current driving chip
Input DI end input.
3. an output current control method for LED display constant-current driving control system, described LED display constant-current driving control
System processed includes that the LED constant current driving chip of N number of cascade, clock CLK end, data latch LE end, output enables OE end, Qi Zhong
The data output DO pin of one LED constant current driving chip and the data input DI pin of the second LED constant current driving chip are connected, the
The data output DO pin of two LED constant current driving chip and the data input DI pin of the 3rd LED constant current driving chip are connected, this
Sample is cascaded to n-th LED drive chip；The clock CLK pin of described N number of LED constant current driving chip is connected with each other, and tandem is to institute
State clock CLK end；The data of described N number of LED constant current driving chip latch LE pin and are connected with each other, and tandem is latched to described data
LE end；The output of described N number of LED constant current driving chip enables OE pin and is connected with each other, and tandem enables OE end to described output；Institute
State respective M the output pin OUT1-OUTM of N number of LED constant current driving chip to be connected with its LED array each controlled；Described
The power vd D pin of N number of LED constant current driving chip is received on power supply；The ground GND pin of described N number of LED constant current driving chip connects
To power supply on the ground；Described N number of LED constant current driving chip respective outer meeting resistance REXT pin is through respective current setting resistance
Receive power supply on the ground；
It is characterized in that: during input current control signal, enable OE end with described output and latch two, LE end end with described data
Sub-input current control signal or enable two terminal input currents of OE end and described clock CLK end with described output and control letter
Number or with described output enable OE end, described data latch LE end and three terminal input currents of described clock CLK end control
Signal, controls the output electric current of the output OUT1-OUTM pin of described N number of LED constant current driving chip.
The most according to claim 3, the output current control method of LED display constant-current driving control system, its feature exists
In:
Current controling signal includes clock and current control data；
Include during the work of described LED display constant-current driving control system that non-electric current adjusts state and electric current adjusts two kinds of works of state
Make state；
Adjust state at non-electric current, if current controling signal is high when rising edge clock signal, then enters electric current and adjust shape
State, after entering electric current adjustment state, it is each that current controling signal is written in described LED display constant-current driving control system
LED constant current driving chip；After completing, described LED display constant-current driving control system exits electric current and adjusts state；Described LED
Each LED constant current driving chip in display screen constant-current driving control system realizes described LED according to described current controling signal
The output of N number of driving output OUT1-OUTM pin of each LED constant current driving chip in display screen constant-current driving control system
The regulation of electric current.
The most according to claim 3, the output current control method of LED display constant-current driving control system, its feature exists
In:
Described current controling signal includes clock and level；
Include during the work of described LED display constant-current driving control system that non-electric current adjusts state and electric current adjusts two kinds of works of state
Make state；
Adjusting state at non-electric current, if when rising edge clock signal, level is high, then enter electric current and adjust shape, enter electricity
After stream adjustment state, each LED constant current driving chip in described LED display constant-current driving control system passes through clock to level
Width counts；After completing, each LED constant current driving chip in described LED display constant-current driving control system exits electric current and adjusts
Whole state；Each LED constant current driving chip in described LED display constant-current driving control system realizes described according to count value
N number of driving of each LED constant current driving chip in LED display constant-current driving control system exports the defeated of OUT1-OUTM pin
Go out the regulation of electric current.
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| CN103165083B (en) * | 2013-03-07 | 2015-07-15 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight drive circuit, liquid crystal display device and drive circuit |
| CN103310735B (en) * | 2013-06-27 | 2015-08-05 | 深圳市明微电子股份有限公司 | A kind of support gray shade scale to expand display control method and system |
| CN106470516A (en) * | 2015-08-21 | 2017-03-01 | 上海馨晔电子科技有限公司 | Single-wire signal transmission 18mA triple channel constant-current LED drives IC |
| CN107403603B (en) * | 2017-09-22 | 2020-03-17 | 深圳市云智科技有限公司 | Control circuit of LED scanning display screen |
| CN108399897B (en) | 2018-05-04 | 2020-06-30 | 京东方科技集团股份有限公司 | Backlight driving circuit and method, backlight module, backlight circuit and display device |
| CN108650755B (en) * | 2018-07-31 | 2020-09-08 | 上海路傲电子科技有限公司 | Linear constant-current driving chip and multi-chip parallel LED lighting driving circuit |
| CN112799996B (en) * | 2021-02-03 | 2022-04-12 | 长沙锐逸微电子有限公司 | Chip cascade expansion control protocol |
| CN113724646B (en) * | 2021-09-01 | 2022-02-11 | 北京芯格诺微电子有限公司 | Drive control method and device for LED display screen |
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| CN202210399U (en) * | 2011-09-28 | 2012-05-02 | 合肥工业大学 | LED display screen constant current drive circuit with optional mirror image ratio |
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