CN104392697B - LED (Light Emitting Diode) display driver chip and LED display screen - Google Patents
LED (Light Emitting Diode) display driver chip and LED display screen Download PDFInfo
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- CN104392697B CN104392697B CN201410767065.9A CN201410767065A CN104392697B CN 104392697 B CN104392697 B CN 104392697B CN 201410767065 A CN201410767065 A CN 201410767065A CN 104392697 B CN104392697 B CN 104392697B
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Abstract
The invention discloses an LED display driver chip. The LED display driver chip comprises an upstream controller, a row voltage source, and a line current source connected with the upstream controller, wherein a row output end of the line current source is connected with the input end of the row voltage source; the processing procedures of the line current source further comprise the following steps: analyzing to obtain a total row power supply number corresponding to a control command outputted by the upstream controller, outputting row encoded control signals, and meanwhile inputting the row display data matched with the row encoded control signals to the output end of the line current source. The upstream controller uniformly sends the control data to the line current source, the line current source controls the scanning row and the line output simultaneously, and the row voltage source and the line current source are both arranged on the same unit plate, so that during the process that the row encoded control signals are transmitted to the row voltage source from the line current source, the transmission is not required to be performed among different unit plates, and the EMI interference problem due to transmission of the signals among the unit plates can be solved.
Description
Technical field
The application is related to LED display control technology field, more particularly, it relates to a kind of LED display drive chip and LED
Display screen.
Background technology
Referring to Fig. 1, Fig. 1 is the structure chart of LED display of the prior art, 1 be upstream controller, 2 be row current source,
3 is row voltage source, and 4 is LED diode matrix circuit, in existing LED display drive chip, the universal serial bus of employing
(SPI) DCLK universal serial bus, SDI universal serial bus, LE universal serial bus, GCLK universal serial bus and SDO universal serial bus are generally comprised,
Wherein SDO universal serial bus is the displacement output (as displacement 16Bit) of SDI universal serial bus, and this group serial bus control LED shows
Row current source 2.And row is output as voltage source 3, to determine the quantity of row bus according to the dutycycle (Duty) that display screen is selected,
As Duty=1/16 (16 sweep), then row bus are 4 input ports, are defined as A [3：0], certainly, if Duty=1/32, OK
Bus is 5 input ports, is defined as A [4：0].
The output signal of row bus and column bus all to be controlled by upstream controller (Host) 1,1 image of upstream controller
Cut into view data line by line, use universal serial bus DCLK, row data is delivered in row current source controller by SDI, LE, SDO, this
A little data in row current source controller, according to the output time to control row current source 1 for the clock signal of GCLK universal serial bus,
Host Synchronization Control row voltage source 3 simultaneously, to realize the dynamic control of LED display；
It is pointed out that described Host is located on different cell boards from described row voltage source 3 and row current source 2, institute
State Host and export row coding control signal A [3 to described row voltage source：When 0], there is electromagnetic wave (Electromagnetic
Interference, EMI) interference.
Content of the invention
In view of this, the application provides a kind of LED display drive chip, for solving upstream controller Host to row voltage
Source exports row coding control signal A [3：When 0], there is electromagnetic wave (Electromagnetic Interference, EMI) and do
Disturb.
To achieve these goals it is proposed that scheme as follows：
A kind of LED display drive chip, including：Upstream controller, row voltage source and be connected with described upstream controller
Row current source, wherein：
The row outfan of described row current source is connected with the input of described row voltage source；
The processing procedure of described row current source also includes：
After parsing obtains the total row power supply number corresponding to control command being exported by described upstream controller, output row is compiled
Code control signal, will enter the outfan to row current source simultaneously in the row video data that described row coding control signal matches.
Preferably, above-mentioned LED display drive chip, described row current source includes：
The first logical block being connected with described upstream controller by universal serial bus；
The pwm control signal output unit being connected with described first logical block；
The memorizer being connected with described first logical block；
The first row logic generator being connected with described memorizer and described first logical block；
Described first logical block is used for downloading row video data to described storage by universal serial bus by upstream controller
In device, download described control command send to PWM in first row logic generator and by the video data being obtained by memorizer
In control signal output unit；
Described pwm control signal output unit is used for according to the row video data output pwm control signal getting；
Described first row logic generator is used for described control command is parsed, and obtains described control command corresponding
After total row power supply number, export row coding control signal to row voltage source, transfer in described memorizer simultaneously and encode with described row
The row video data that control signal matches is to described first logical block.
Preferably, above-mentioned LED display drive chip, described row current source includes：
The second logical block being connected with described upstream controller by universal serial bus；
The pwm control signal output unit being connected with described second logical block；
The memorizer being connected with described second logical block；
The secondary series logic generator being connected with described second logical block；
Described second logical block is used for downloading row video data to described storage by universal serial bus by upstream controller
Device, download and parse the control command being sent by described upstream controller, obtain the corresponding total row power supply of described control command
After number, described secondary series logic generator is controlled to export row coding control signal to row voltage source, simultaneously by described memorizer
Transfer and send the row video data matching with described row coding control signal to pwm control signal output unit；
Described secondary series logic generator is connected with described second logical block, for according to described second logical block solution
After analysis obtains the corresponding total row power supply number of described control command, export row coding control signal to row voltage source.
Preferably, above-mentioned LED display drive chip, including：
Described row coding control signal is logic control signal or pulse control signal.
A kind of LED display, including：Diode matrix circuit, also includes LED display disclosed in above-mentioned any one and drives
Chip.
It can be seen from above-mentioned technical scheme that, upstream controller described in LED display drive chip disclosed in the present application
Control data unification is sent to described row current source, scanning row and column output is controlled by described row current source, that is, originally simultaneously
Disclosed in application above-described embodiment, row current source, while exporting row electric current, also controls the exports coding of row voltage source simultaneously,
Because described row voltage source and described row current source are arranged on same cell board, therefore described row coding control signal by
It is not necessary to across cell board transmission during row current source is transferred to described row voltage source, therefore do not exist because signal is in unit
The problem of the EMI interference causing is transmitted between plate.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing providing obtains other accompanying drawings.
Fig. 1 is the structure chart of LED display of the prior art；
Fig. 2 is a kind of structure chart of LED display drive chip disclosed in the embodiment of the present application；
Fig. 3 is a kind of structure chart of row current source disclosed in the embodiment of the present application；
Fig. 4 is a kind of structure chart of row current source disclosed in another embodiment of the application.
Specific embodiment
It is directed to Host described in technical scheme of the prior art and exporting row coding control signal A to described row voltage source
[3：When 0], there is electromagnetic wave (Electromagnetic Interference, EMI) interference and cause the problem of distorted signals,
This application discloses a kind of LED display drive chip.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Fig. 2 is a kind of structure chart of LED display drive chip disclosed in the embodiment of the present application.
Fig. 3 is a kind of structure chart of row current source disclosed in the embodiment of the present application.
Referring to Fig. 2 and Fig. 3, LED display drive chip disclosed in the embodiment of the present application includes：Upstream controller 1, row electric current
Source 5 and row voltage source 3；
Described row current source 5 includes：The first logical block 101 being connected with described upstream controller 1 by universal serial bus
And the pwm control signal output unit 504 (CH [0 being connected with described first logical block 101 outfan：15] PWM), described row
Row outfan (the A [3 of current source 5：0]) input (A [3 with described row voltage source 3：0]) it is connected；
The processing procedure of described row current source 5 also includes：
Get the control command of upstream controller 1 output by universal serial bus, and parse and obtain being controlled by described upstream
After total row power supply number corresponding to control command (as 16 row or 32 row or other) of device 1 output, output row coding-control letter
Number, the outfan to row current source will be entered in the row video data that described row coding control signal matches simultaneously.
It is pointed out that the quantity of the described pwm control signal output unit 504 in the present embodiment is by diode matrix
Depending on the concrete structure of circuit 4, total row power supply several rows number that the quantity of the row outfan of described row current source 5 is scanned by need and
Fixed, such as, when described total row power supply number is 16 row, the row outfan of described row current source 5 is A [3：0], when total row electricity
When source number is 32 row, the row outfan of described row current source 5 is A [4：0].
When being controlled to diode matrix circuit 4 disclosed in application the above embodiments of the present application, described row current source 5
The control command being exported by described upstream controller 1 is downloaded by universal serial bus, and automatically analyzes defeated required for this control command
The total row power supply number going out, is exported the first row coding control signal, will be mated with described the first row coding control signal simultaneously
Row video data export row current source output mouth, be further continued for export next line coding control signal (second row coding control
Signal processed), the row video data being matched with this row coding control signal is exported the output port of row current source, such as simultaneously
This, scan successively to last column, after last column end of scan, next line is defaulted as the first row.
Visible by LED display drive chip disclosed in the above embodiments of the present application, described upstream controller will control number
Send to described row current source according to unified, scanning row and column output is controlled by described row current source, that is, the application is above-mentioned simultaneously
Row current source disclosed in embodiment, while exporting row electric current, also controls the exports coding of row voltage source, due to described simultaneously
Row voltage source and described row current source are arranged on same cell board, therefore in described row coding control signal by row current source
It is not necessary to across cell board transmission during being transferred to described row voltage source, therefore do not exist and transmitted between cell board due to signal
The problem of the EMI interference causing.Simultaneously because being all directly or indirectly to lead to each signal that diode matrix circuit 4 is controlled
Cross the output of row controller, the phase contrast between them is basically identical.
Referring to Fig. 3, described row current source 5 disclosed in the above embodiments of the present application can include：First logical block 501,
Memorizer 502, first row logic generator 503 and multiple pwm control signal output unit, concrete annexation is as follows：
Described first logical block 501 is connected with described upstream controller 1, for by universal serial bus by universal serial bus
By upstream controller 1 download row video data in described memorizer 502, download the control that sent by described upstream controller 1
Order in first row logic generator 503 and will be sent to pwm control signal output by the video data that memorizer 502 obtains
In unit 504；
Described pwm control signal output unit 504 is connected with the row output port of described first logical block 501, is used for
Export pwm control signal according to the row video data getting by described first logical block 501 to diode matrix circuit
4；
Described memorizer 502 is connected with described first logical block 501, for storage by described first logical block 501
The row video data sending；
Described first row logic generator 504 is connected with described memorizer 502 and described first logical block 501, is used for
Described control command is parsed, after obtaining the corresponding total row power supply number of described control command, exports row to row voltage source
Coding control signal, transfers the row video data matching in described memorizer 502 with described row coding control signal extremely simultaneously
In described first logical block 501.
Fig. 4 is a kind of structure chart of row current source disclosed in another embodiment of the application；
Referring to Fig. 4, disclosed in the above embodiments of the present application, the structure of described row current source 5 can also be：Described row electric current
Source 5 includes：Second logical block 505, memorizer 502, secondary series logic generator 506 and the output of multiple pwm control signal
Unit 504, concrete annexation is as follows：
Described second logical block 505 is connected with described upstream controller 1, for by universal serial bus by universal serial bus
By upstream controller 1 download row video data in described memorizer 502, download and parse and sent by described upstream controller 1
Control command obtain the corresponding total row power supply number of described control command after, control described secondary series logic generator to row electricity
Potential source exports row coding control signal, simultaneously by transferring in described memorizer 502 and send and described row coding control signal phase
The row video data of coupling is to pwm control signal output unit 504；
Described pwm control signal output unit 504 is connected with the row output port of described second logical block 505, is used for
Export pwm control signal according to the row video data getting by described second logical block 505 to diode matrix circuit
4；
Described memorizer 502 is connected with described second logical block 505, for storage by described second logical block 505
The row video data sending；
Described secondary series logic generator 506 is connected with described second logical block 505, for according to described second logic
After unit 505 parsing obtains the corresponding total row power supply number of described control command, export row coding control signal to row voltage source
(row coding control signal now can be the row coding control signal of the first row).
It is understood that the row outfan of the described row current source in the above-mentioned any one embodiment of the application can be institute
State the general-purpose interface of row current source, that is, row current source in the above embodiments of the present application can be with getting by universal serial bus
Control command, by control logic A [(n-1) of internal rows voltage source:0], according to needs, by the means of programming, by these logics
General-purpose interface (row outfan) output by row controller for the signal, total row power supply that wherein said N is obtained by described parsing
Number determine, for example, described total row power supply number be 16 be described N be 15, i.e. total row power supply number -1 of described N=, this area skill
Art personnel can be by the means of programming, and the general-purpose interface that these logical signals representing row power supply are passed through row controller is defeated
Go out, such as, when needing to export the first row coding control signal, can control row outfan output A [0000] of described row current source, when
When need to export the second row coding control signal, can control row outfan output A [0001] of described row current source, wherein 0 representative
Low level signal, 1 represents high level signal it is of course possible to be understood by, the row volume of the row outfan output of described row current source
Code control signal can be the above-mentioned logic control signal comprising 0,1 or pulse control signal, when described row encodes control
When signal processed is pulse control signal, the row outfan of described row current source can be only an output pin.
It is understood that corresponding to above-mentioned LED display drive chip, disclosed herein as well is a kind of LED display, ginseng
See Fig. 2, described LED display includes：Diode matrix circuit 4 and LED display disclosed in above-mentioned any one embodiment drive
Chip.
In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one
The scope the widest causing.
Claims (3)
1. a kind of LED display drive chip, including：Upstream controller, row voltage source and the row being connected with described upstream controller
Current source is it is characterised in that include：
The row outfan of described row current source is connected with the input of described row voltage source；
The processing procedure of described row current source also includes：
After parsing obtains the total row power supply number corresponding to control command being exported by described upstream controller, output row coding control
Signal processed, will enter the outfan to row current source simultaneously in the row video data that described row coding control signal matches；
Described row current source includes：
The first logical block being connected with described upstream controller by universal serial bus；
The pwm control signal output unit being connected with described first logical block；
The memorizer being connected with described first logical block；
The first row logic generator being connected with described memorizer and described first logical block；
Described first logical block be used for by universal serial bus by upstream controller download row video data in described memorizer,
Download described control command to send to PWM control letter in first row logic generator and by the video data being obtained by memorizer
In number output unit；
Described pwm control signal output unit is used for according to the row video data output pwm control signal getting；
Described first row logic generator is used for described control command is parsed, and obtains described control command corresponding total
After row power supply number, to row voltage source export row coding control signal, transfer simultaneously in described memorizer with described row coding-control
The row video data that signal matches is to described first logical block；
Or described row current source includes：
The second logical block being connected with described upstream controller by universal serial bus；
The pwm control signal output unit being connected with described second logical block；
The memorizer being connected with described second logical block；
The secondary series logic generator being connected with described second logical block；
Described second logical block be used for by universal serial bus by upstream controller download row video data to described memorizer, under
Carry and parse the control command being sent by described upstream controller, after obtaining the corresponding total row power supply number of described control command,
Control described secondary series logic generator to export row coding control signal to row voltage source, transferred simultaneously by described memorizer simultaneously
Send the row video data matching with described row coding control signal to pwm control signal output unit；
Described secondary series logic generator is connected with described second logical block, for parsing according to described second logical block
To after the corresponding total row power supply number of described control command, export row coding control signal to row voltage source.
2. LED display drive chip according to claim 1 is it is characterised in that include：
Described row coding control signal is logic control signal or pulse control signal.
3. a kind of LED display, including：Diode matrix circuit is it is characterised in that also include：Claim 1-2 any one
Disclosed LED display drive chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410767065.9A CN104392697B (en) | 2014-12-12 | 2014-12-12 | LED (Light Emitting Diode) display driver chip and LED display screen |
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| CN201410767065.9A CN104392697B (en) | 2014-12-12 | 2014-12-12 | LED (Light Emitting Diode) display driver chip and LED display screen |
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| CN104392697A CN104392697A (en) | 2015-03-04 |
| CN104392697B true CN104392697B (en) | 2017-02-22 |
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| CN105741757A (en) * | 2016-04-27 | 2016-07-06 | 南京大学 | High-refresh-rate 1/16 scanning P4 full-color LED display device and scanning method thereof |
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| CN101866613B (en) * | 2007-01-08 | 2012-05-23 | 北京巨数数字技术开发有限公司 | Scanning type LED display device and method for eliminating forward moving hidden brightness thereof |
| CN201655248U (en) * | 2010-04-15 | 2010-11-24 | 上海凌犀电子科技有限公司 | LED dot-matrix scanning driving control circuit and LED dot-matrix scanning control chip |
| CN101937649A (en) * | 2010-09-08 | 2011-01-05 | 矽恩微电子(厦门)有限公司 | LED display screen and drive method thereof |
| CN102421216B (en) * | 2010-09-28 | 2014-05-07 | 深圳市长运通光电技术有限公司 | LED (Light-Emitting Diode) array scanning chip, LED device and LED scanning circuit |
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