CN109377937A - LED driving method and driving circuit - Google Patents
LED driving method and driving circuit Download PDFInfo
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- CN109377937A CN109377937A CN201811315355.4A CN201811315355A CN109377937A CN 109377937 A CN109377937 A CN 109377937A CN 201811315355 A CN201811315355 A CN 201811315355A CN 109377937 A CN109377937 A CN 109377937A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a kind of LED driving method and driving circuit, the LED driving method is comprising steps of the data that receiving front-end circuit is sent；The data that front-end circuit is sent are decoded and export decoding order；Corresponding parameter setting is carried out to LED circuit according to decoding order or driving operates；The synchronization pulse of receiving front-end circuit simultaneously drives LED circuit to light/extinguish.LED driving method provided by the invention, which shows LED circuit, to be refreshed by bit, every display one, it is only necessary to which transmission primaries data can be realized more bit gradations by the LED drive circuit of rear end and show, to reduce data throughout, the efficiency that LED is shown is improved；Also, even if using field frequency frequency doubling technology, data throughout is constant.
Description
Technical field
The present invention relates to technical field of LED display, in particular to a kind of LED driving method and driving circuit.
Background technique
Since light emitting diode (LED) display screen has, bright in luster, brightness is high, the service life is long, stable and reliable in work etc. excellent
Point is all widely used in many industries.Such as AT STATION, harbour, market, bank public place, LED display can
It is issued for real time information, the information be should be noted to public's transmitting promptly and accurately.
There are millions of or even ten million meter LED, these LED directly to connect, drive with driving chip for one piece of LED display
Dynamic chip generallys use the constant-current driven chip of serioparallel exchange, refreshes display by bit, and the efficiency of data transmission is very low.
By taking 12 bit gradations are shown as an example, each field will at least be refreshed 12 times, show the gray scale of 1 bit every time, pass through 12 times i.e. 12
The gray scale of bit is cumulative, could form the correct picture of the complete gray scale of a width.Data throughout is big during this, low efficiency
Under, if using field frequency frequency doubling technology simultaneously, data throughout will be multiplied, and cause efficiency lower.Meanwhile data throughout
Greatly, it is meant that circuit overhead is big, to increase circuit cost and design complexities.
Thus the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of LED driving method and drivings
Circuit only needs transmission primaries data, so that it may realize that the more bit gradations of circuit are shown, to reduce data throughout, improve
The efficiency that LED is shown.
In order to achieve the above object, this invention takes following technical schemes:
A kind of LED driving method, comprising the following steps:
The data that receiving front-end circuit is sent；
The data that front-end circuit is sent are decoded and export decoding order；
Corresponding parameter setting is carried out to LED circuit according to decoding order or driving operates；
The synchronization pulse of receiving front-end circuit simultaneously drives LED circuit to light/extinguish.
In the LED driving method, the receiving front-end circuit send data the step of after, further include step
It is rapid:
The data that front-end circuit is sent are one group with every 24 data of reception and form decoding data.
In the LED driving method, the data sent to front-end circuit are decoded and export decoding order
Step specifically includes:
Choose the command word and identification code of decoding data；
The type of command word is judged according to the identification code of decoding data and carries out exporting corresponding decoding order.
In the LED driving method, it is described choose decoding data command word and identification code the step of specifically include:
By the 1st of decoding data to the 16th composition command word；
By the 17th of decoding data and the 18th composition identification code.
In the LED driving method, the identification code of the decoding data judges the type of command word and carries out output pair
The step of decoding order answered, specifically includes:
When identification code is equal to 01, command word is gating word, output gating word command；
When identification code is equal to 10, command word is data word, output data word command；
When identification code is equal to 11, command word is setting word, output setting word command；
When identification code is equal to 00, ignore command word.
It is described that corresponding parameter setting or driving are carried out to LED circuit according to decoding order in the LED driving method
The step of operation, specifically includes:
When the decoding order of output be gating word command when, according to gating word command control corresponding LED circuit part whether
It lights；
When the decoding order of output is data word command, the gray value of LED circuit is set according to data word command；
When the decoding order of output be setting word command when, according to setting word command be arranged LED circuit display gray scale not and
Field frequency frequency.
It is described when the decoding order of output is setting word command in the LED driving method, according to setting word command
The display gray scale that LED circuit is arranged is not specifically included with the step of field frequency frequency:
When the decoding order of output is setting word command, according to the display of the value setting LED circuit of the least-significant byte of setting word command
Grey level；
When the decoding order of output is setting word command, according to the field frequency of the value setting LED circuit of the most-significant byte of setting word command
Frequency.
A kind of LED drive circuit, including the LED circuit and driving circuit being made of multiple LED, the driving circuit packet
It includes:
Data interface module for the data that receiving front-end circuit is sent；
For the data that front-end circuit is sent to be decoded and are exported with the decoding module of decoding order；
For receiving the decoding order and the drive module for carrying out driving operation that decoding module exports；
For receiving the decoding order and the setup module for carrying out parameter setting that decoding module exports；
The data interface module connects decoding module, and the decoding module is also connected with drive module and setup module, the drive
Dynamic model block is also connected with LED circuit.
In the LED drive circuit, the decoding order includes gating word command, setting word command and data word life
It enables.
In the LED drive circuit, the data interface module uses I2C interface or SPI interface receiving front-end circuit
The data of transmission.
Compared to the prior art, a kind of LED driving method and driving circuit provided by the invention, the LED driving method
Comprising steps of the data that receiving front-end circuit is sent；The data that front-end circuit is sent are decoded and export decoding order；Root
Corresponding parameter setting is carried out to LED circuit according to decoding order or driving operates；The synchronization pulse of receiving front-end circuit is simultaneously
Driving LED circuit is lighted/is extinguished.LED driving method provided by the invention, which shows LED circuit, to be refreshed by bit, often
Display one, it is only necessary to transmission primaries data can be realized more bit gradations by the LED drive circuit of rear end and show, thus
Data throughout is reduced, the efficiency that LED is shown is improved；Also, even if data throughout is not using field frequency frequency doubling technology
Become.
Detailed description of the invention
Fig. 1 is the functional block diagram of LED drive circuit provided by the invention.
Fig. 2 is the flow chart of LED driving method provided by the invention.
Fig. 3 is the structural schematic diagram of decoding data provided by the invention and decoding order.
Fig. 4 is the flow chart of step S200 in LED driving method provided by the invention.
Fig. 5 is the flow chart of step S210 in LED driving method provided by the invention.
Fig. 6 is the flow chart of step S220 in LED driving method provided by the invention.
Fig. 7 is the flow chart of step S300 in LED driving method provided by the invention.
Fig. 8 is the flow chart of step S330 in LED driving method provided by the invention.
Fig. 9 is the circuit diagram of drive module provided by the invention.
Figure 10 is the circuit diagram of drive sub-circuits provided by the invention.
Figure 11 is the work wave schematic diagram of the PWM module of embodiment one provided by the invention.
Figure 12 is the work wave schematic diagram of the PWM module of embodiment two provided by the invention.
Specific embodiment
The present invention provides a kind of LED driving method and driving circuit, to make the purpose of the present invention, technical solution and effect more
Add clear, clear, the present invention is described in more detail as follows in conjunction with drawings and embodiments.It should be appreciated that described herein
Specific examples are only used to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, the functional block diagram of LED drive circuit provided by the invention, the LED drive circuit includes by multiple
The LED circuit (not shown) that LED is formed and the driving circuit for driving LED circuit luminous, the driving circuit include:
Data interface module 10 for the data that receiving front-end circuit is sent；
For the data that front-end circuit is sent to be decoded and are exported with the decoding module 20 of decoding order；
For receiving the decoding order and the drive module 30 for carrying out driving operation that decoding module exports；
For receiving the decoding order and the setup module 40 for carrying out parameter setting that decoding module exports；
The data interface module 10 connects decoding module 20, and the decoding module 20 is also connected with drive module 30 and setup module
40, the drive module 30 is also connected with LED circuit.
It is the flow chart of LED driving method provided by the invention please continue to refer to Fig. 2, the LED driving method includes step
It is rapid:
The data that S100, receiving front-end circuit are sent；
S200, the data that front-end circuit is sent are decoded and export decoding order；
S300, corresponding parameter setting or driving operation are carried out to LED circuit according to decoding order；
S400, receiving front-end circuit synchronization pulse and drive LED circuit to light/extinguish.
The LED driving method and LED drive circuit provided through the invention can make the display of LED circuit need not be by bit
Refresh, every display one, it is only necessary to which front-end circuit transmission primaries data can realize more bit greys by the driving circuit of rear end
Degree display, to reduce data throughout, improves the efficiency that LED is shown.Wherein, so-called data throughout, refers to circuit
Facility is successfully delivered the quantity of data within the unit time (often with the measurement such as bit or byte)；So-called front-end circuit, refers to
The single chip machine controlling circuit that the display of LED circuit is controlled.
Further, after step sloo, it further comprises the steps of:
The data that front-end circuit is sent are one group with every 24 data of reception and form decoding data.
After the data that i.e. data interface module receiving front-end circuit is sent, with every data group for receiving 3 bytes (24)
Decoder unit is transferred at a decoding data.It is the knot of decoding data provided by the invention and decoding order referring specifically to Fig. 3
Structure schematic diagram, decoding data is by b0To b23That is totally 24 data form b [23:0].Preferably, the data interface module uses
The data that I2C interface or SPI interface receiving front-end circuit are sent.
Please continue to refer to Fig. 4, the step S200 is specifically included:
S210, the command word and identification code for choosing decoding data；
S220, the type that command word is judged according to the identification code of decoding data simultaneously carry out exporting corresponding decoding order.
Decoding module extracts command word and identification code in decoding data, final output decoding by preset decoding rule
Order, to carry out corresponding parameter setting or driving operation to LED circuit.The decoding order specifically may include gating word life
It enables, word command and data word command is set.
Incorporated by reference to Fig. 3 and Fig. 5, the step S210 is specifically included:
S211, by the 1st of decoding data to the 16th composition command word；
S212, by the 17th of decoding data and the 18th composition identification code.
Low 16 b [15:0] of decoding data are chosen i.e. in Fig. 5 and form command word, choose decoding data the 17th and the 18th
Position b [17:16] is identification code.
Incorporated by reference to Fig. 3 and Fig. 6, the step S220 is specifically included:
S221, when identification code be equal to 01 when, command word be gating word, output gating word command；
S222, when identification code be equal to 10 when, command word is data word, output data word command；
S223, when identification code be equal to 11 when, command word be setting word, output setting word command；
S224, when identification code be equal to 00 when, ignore command word.
I.e. when identification code is equal to 01, decoding order is gating word command s [15:0]；When identification code is equal to 10, decoding
Order is data word command d [15:0]；When identification code is equal to 11, decoding order is setting word command p [15:0].
In a still further embodiment, referring to Fig. 7, the step S300 is specifically included:
S310, when the decoding order of output is gating word command, the part of corresponding LED circuit is controlled according to gating word command
Whether light；
S320, when the decoding order of output be data word command when, according to data word command be arranged LED circuit gray value；
S330, when the decoding order of output be setting word command when, according to setting word command be arranged LED circuit display gray scale
Other and field frequency frequency.
Referring to Fig. 8, the step S330 is specifically included:
S331, when the decoding order of output be setting word command when, according to setting word command least-significant byte value be arranged LED circuit
Display gray scale it is other；
S332, when the decoding order of output be setting word command when, according to setting word command most-significant byte value be arranged LED circuit
Field frequency frequency.
In a more specific embodiment, according to setting word command be arranged LED circuit display gray scale not and field frequency frequency multiplication
Several rules is as follows:
It is that display gray scale is other that word least-significant byte p [7:0], which is arranged:
It is 8 bit gradation ranks when p [7:0] is equal to 1；
It is 9 bit gradation ranks when p [7:0] is equal to 2；
It is 10 bit gradation ranks when p [7:0] is equal to 3；
It is 11 bit gradation ranks when p [7:0] is equal to 4；
It is 12 bit gradation ranks when p [7:0] is equal to 5；
It is 13 bit gradation ranks when p [7:0] is equal to 6；
It is 14 bit gradation ranks when p [7:0] is equal to 7；
It is 15 bit gradation ranks when p [7:0] is equal to 8；
It is 16 bit gradation ranks when p [7:0] is equal to other values.
It is field frequency frequency that word most-significant byte p [15:8], which is arranged:
It is 1 multiple field frequency mode when p [15:8] is equal to 1；
It is 2 multiple field frequency modes when p [15:8] is equal to 2；
It is 3 multiple field frequency modes when p [15:8] is equal to 3；
It is 4 multiple field frequency modes when p [15:8] is equal to 4；
It is 5 multiple field frequency modes when p [15:8] is equal to 5；
It is 6 multiple field frequency modes when p [15:8] is equal to 6；
It is 7 multiple field frequency modes when p [15:8] is equal to 7；
It is 8 multiple field frequency modes when p [15:8] is equal to 8；
It is 9 multiple field frequency modes when p [15:8] is equal to 9；
It is 10 multiple field frequency mode of highest when p [15:8] is equal to other values.
In addition, referring to Fig. 9, being the circuit diagram of drive module provided by the invention, the drive module is by 16
Identical LED drive sub-circuits 31 form, i.e., the 1st driving circuit to the 16th driving circuit in figure, each LED driving son electricity
Road 31 drives 1/string LED, and 1 drive module can at most drive 16/string LED.
When drive module work, the field system chronizing impulse Vsync that receiving front-end circuit is sent, each Vsync pulse
Indicate that each refreshing starts, 16 drive sub-circuits share Vsync pulse and data word d [15:0], gate word s0, s1 ...
S15 is respectively connected to the 1st driving circuit, the 16th driving circuit of the 2nd driving circuit ..., when the gating word si of data-in port is height
When level, the first register in i+1 driving circuit is written in data word d [15:0].
Referring to Fig. 10, the present invention also provides the circuit diagrams of drive sub-circuits.The drive sub-circuits 31 are specifically wrapped
Include the first register 311, the second register 312, times frequency module 313, PWM module 314 and single led or multiple LED string
The LED sub-circuit 315 that connection/parallel connection is formed.
When it is high for inputting the correspondence position si of gating word of drive sub-circuits, the first register is written in data word d [15:0]
311, when Vsync pulse arrives, data word that the first register 311 receives Vsync pulse and stores the first register 311
D [15:0] pours into the second register 312, and 312 output data word d [15:0] of the second register gives PWM module 314.At this point, frequency multiplication
Module 313 is other corresponding field frequency frequency and display gray scale is arranged according to setting word p [15:0], and Vsync pulse is through frequency multiplication
The clock pulses of the generation higher frequency of module 313.PWM module 314 is sent under double frequency pulse driving by the second register 312
Data word d [15:0] gray value of front court (adjustment work as) generate pwm signal (pulse width modulating signal or pulsewidth modulation letter
Number).When PWM is high, LED sub-circuit 315 is connected and lights；Conversely, LED sub-circuit 315 turns off and extinguishes when PWM is low.
In this way, only may make entire LED circuit to show complete gray value by once lighting refreshing.
In order to preferably show LED driving method and driving circuit provided by the invention, in a certain specific embodiment,
Decoding order is setting word command, and is 12, field frequency frequency according to the bit gradation rank that LED circuit is arranged in setting word command
When being 1, the work wave schematic diagram of PWM module is as shown in figure 11；In a certain specific embodiment, decoding order is setting
Word command, and according to setting word command be arranged LED circuit bit gradation rank be 10, field frequency frequency is 2 when, PWM mould
The work wave schematic diagram of block is as shown in figure 12.
In conclusion the LED driving method includes step the present invention provides a kind of LED driving method and driving circuit
It is rapid: the data that receiving front-end circuit is sent；The data that front-end circuit is sent are decoded and export decoding order；According to decoding
Order carries out corresponding parameter setting to LED circuit or driving operates；The synchronization pulse of receiving front-end circuit simultaneously drives LED
Circuit is lighted/is extinguished.LED driving method provided by the invention, which shows LED circuit, to be refreshed by bit, every display one
, it is only necessary to transmission primaries data can be realized more bit gradations by the LED drive circuit of rear end and show, to reduce
Data throughout improves the efficiency that LED is shown；Also, even if using field frequency frequency doubling technology, data throughout is constant.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of LED driving method, which comprises the following steps:
The data that receiving front-end circuit is sent；
The data that front-end circuit is sent are decoded and export decoding order；
Corresponding parameter setting is carried out to LED circuit according to decoding order or driving operates；
The synchronization pulse of receiving front-end circuit simultaneously drives LED circuit to light/extinguish.
2. LED driving method according to claim 1, which is characterized in that in the data that the receiving front-end circuit is sent
The step of after, further comprise the steps of:
The data that front-end circuit is sent are one group with every 24 data of reception and form decoding data.
3. LED driving method according to claim 2, which is characterized in that the data sent to front-end circuit carry out
It decodes and is specifically included the step of exporting decoding order:
Choose the command word and identification code of decoding data；
The type of command word is judged according to the identification code of decoding data and carries out exporting corresponding decoding order.
4. LED driving method according to claim 3, which is characterized in that the command word and knowledge for choosing decoding data
The step of other code, specifically includes:
By the 1st of decoding data to the 16th composition command word；
By the 17th of decoding data and the 18th composition identification code.
5. LED driving method according to claim 4, the identification code of the decoding data judges that the type of command word is gone forward side by side
The step of row output corresponding decoding order, specifically includes:
When identification code is equal to 01, command word is gating word, output gating word command；
When identification code is equal to 10, command word is data word, output data word command；
When identification code is equal to 11, command word is setting word, output setting word command；
When identification code is equal to 00, ignore command word.
6. LED driving method according to claim 5, described to carry out corresponding parameter to LED circuit according to decoding order
The step of setting or driving operation, specifically includes:
When the decoding order of output be gating word command when, according to gating word command control corresponding LED circuit part whether
It lights；
When the decoding order of output is data word command, the gray value of LED circuit is set according to data word command；
When the decoding order of output be setting word command when, according to setting word command be arranged LED circuit display gray scale not and
Field frequency frequency.
7. LED driving method according to claim 6, which is characterized in that described when the decoding order of output is setting word
When order, do not specifically included with the step of field frequency frequency according to the display gray scale that LED circuit is arranged in setting word command:
When the decoding order of output is setting word command, according to the display of the value setting LED circuit of the least-significant byte of setting word command
Grey level；
When the decoding order of output is setting word command, according to the field frequency of the value setting LED circuit of the most-significant byte of setting word command
Frequency.
8. a kind of LED drive circuit, including the LED circuit being made of multiple LED, which is characterized in that it further include driving circuit, institute
Stating driving circuit includes:
Data interface module for the data that receiving front-end circuit is sent；
For the data that front-end circuit is sent to be decoded and are exported with the decoding module of decoding order；
For receiving the decoding order and the drive module for carrying out driving operation that decoding module exports；
For receiving the decoding order and the setup module for carrying out parameter setting that decoding module exports；
The data interface module connects decoding module, and the decoding module is also connected with drive module and setup module, the drive
Dynamic model block is also connected with LED circuit.
9. LED drive circuit according to claim 8, which is characterized in that the decoding order includes gating word command, sets
Set word command and data word command.
10. LED drive circuit according to claim 8, which is characterized in that the data interface module uses I2C interface
Or the data that SPI interface receiving front-end circuit is sent.
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| CN201811315355.4A CN109377937B (en) | 2018-11-06 | 2018-11-06 | LED driving method and driving circuit |
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| CN201811315355.4A CN109377937B (en) | 2018-11-06 | 2018-11-06 | LED driving method and driving circuit |
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| CN101968949A (en) * | 2010-09-20 | 2011-02-09 | 青岛海信电器股份有限公司 | Drive control circuit and electronic equipment |
| CN103839519A (en) * | 2011-05-25 | 2014-06-04 | 深圳市明微电子股份有限公司 | Display driving circuit and system with same |
| CN105096821A (en) * | 2015-05-21 | 2015-11-25 | 杭州士兰控股有限公司 | Gray scale display driving method and gray scale display drive unit |
| CN205312850U (en) * | 2016-01-25 | 2016-06-15 | 天津城建大学 | Automatic escalator direction indicator with prevent reverse prompt facility that gets into |
| CN107301838A (en) * | 2017-08-11 | 2017-10-27 | 广汉阿拉丁科技有限公司 | The drive circuit of light-emitting diode display |
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2018
- 2018-11-06 CN CN201811315355.4A patent/CN109377937B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968949A (en) * | 2010-09-20 | 2011-02-09 | 青岛海信电器股份有限公司 | Drive control circuit and electronic equipment |
| CN103839519A (en) * | 2011-05-25 | 2014-06-04 | 深圳市明微电子股份有限公司 | Display driving circuit and system with same |
| CN105096821A (en) * | 2015-05-21 | 2015-11-25 | 杭州士兰控股有限公司 | Gray scale display driving method and gray scale display drive unit |
| CN205312850U (en) * | 2016-01-25 | 2016-06-15 | 天津城建大学 | Automatic escalator direction indicator with prevent reverse prompt facility that gets into |
| CN107301838A (en) * | 2017-08-11 | 2017-10-27 | 广汉阿拉丁科技有限公司 | The drive circuit of light-emitting diode display |
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| CN109377937B (en) | 2020-12-22 |
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