CN205069080U - LED driver reaches LED display screen including it - Google Patents
LED driver reaches LED display screen including it Download PDFInfo
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- CN205069080U CN205069080U CN201520790881.1U CN201520790881U CN205069080U CN 205069080 U CN205069080 U CN 205069080U CN 201520790881 U CN201520790881 U CN 201520790881U CN 205069080 U CN205069080 U CN 205069080U
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Abstract
The utility model provides a LED driver reaches LED display screen including it, the LED driver includes: high frequency clock module, frequency conversion address module and data storage module, wherein, high frequency clock module includes the clock output end for carry out the raising frequency to the received clock frequency of system and handle output high frequency clock signal, frequency conversion address module includes clock input end, inquiry address output and clock signal output, and the clock input end is connected with the clock output end electricity of high frequency clock module for carry out the frequency conversion to high frequency clock signal and handle output frequency conversion clock signal and inquiry address signal, data storage module is including inquiry address input and drive signal output, inquiry address input and inquiry address electric connection of output for according to the drive signal that frequency the same of inquiry address signal output with frequency conversion clock signal. The utility model discloses utilize above -mentioned LED driver to solve the serious technical problem of LED display screen radiation among the prior art.
Description
Technical field
The utility model relates to LED technology field, in particular to a kind of LED driver and the LED display comprising it.
Background technology
LED display is made up of LED and driving chip, the image of screen forms the main driving chip lightening LED lamp that leans on to show the data of different gray scale, gradation data inputs LED drive chip in serial transmission mode, and every LEDs driving chip has common clock and data-signal.
The LED display manufactured in prior art all adopts sequential as shown in Figure 1 to design, a LED display is made up of multilink, Fig. 1 is single link sequential chart, wherein CLK is clock signal, and SDI is drive singal, and LE is that bolt-lock signal is (when LE is for being noble potential, serial data can be passed into output bolt lock device, when being electronegative potential, data can be lived by bolt-lock), OE is current drive signal.
Actual LED display has very multilink, corresponding different SDI, such as a display screen has SDI0 to SDI31, totally 32 links, every bar chain route plurality of LEDs driving chip serial connection forms, and a LEDs chip can control 16 LED lamp, serial connection LED drive chip is to realize controlling plurality of LEDs lamp, therefore, on pcb board, clock routing can be very long, causes very serious EMI radiation.
LED display of the prior art all adopts sequential as shown in Figure 1 to design, and therefore product does not all check the product of CLASSB test by CCC.
For the problem that LED display radiation in above-mentioned prior art is serious, at present effective solution is not yet proposed.
Utility model content
Fundamental purpose of the present utility model is the LED display providing a kind of LED driver and comprise it, to solve the problem that in prior art, the electromagnetic radiation of LED display is larger.
To achieve these goals, according to an aspect of the present utility model, provide a kind of LED driver, be connected with system clock module and multiple LED drive chip respectively, it is characterized in that, LED driver comprises: high frequency clock module, frequency conversion address module and data memory module, wherein, high frequency clock module comprises output terminal of clock, for carrying out raising frequency process to the system clock frequency received, exports high frequency clock signal; Frequency conversion address module comprises input end of clock, inquire address output terminal and clock signal output terminal, input end of clock is electrically connected with the output terminal of clock of high frequency clock module, for carrying out frequency-conversion processing to high frequency clock signal, export variable frequency clock signal and inquire address signal, wherein, the variable frequency clock signal of output is identical with the frequency of inquire address signal; Data memory module comprises inquire address input end and drive singal output terminal, inquire address input end is electrically connected with inquire address output terminal, for inquiring about the activation bit for driving LED driving chip that it stores according to inquire address signal, export the drive singal identical with the frequency of variable frequency clock signal.
Further, connect in the mode of series connection between multiple LED drive chip, wherein, drive singal output terminal and multiple LED drive chip of data memory module are connected in series.
Further, the clock signal output terminal of frequency conversion address module is connected with each LED drive chip respectively.
Further, the variable frequency clock signal of output and the signal frequency interval of inquire address signal are 9MHz-11MHz.
Further, with predetermined frequency interval, frequency-conversion processing is carried out to variable frequency clock signal and inquire address signal.
Further, high frequency clock module is PLL phase-locked loop clock module.
Further, LED driver adopts FPGA programmable gate array chip to form.
Further, LED drive chip comprises: bit shift register, for receiving drive singal and variable frequency clock signal.
Further, LED drive chip also comprises: export bolt lock device, be connected, for when latch signal is electronegative potential, carry out bolt-lock process to drive singal with bit shift register; Output driver, is connected with output bolt lock device, for when data output control signal is electronegative potential, exports drive singal.
According to another aspect of the present utility model, provide a kind of LED display, comprise the system clock module connected successively, above-mentioned LED driver, LED drive chip and LED.
Application the technical solution of the utility model, the LED driver that the utility model provides comprises high frequency clock module, frequency conversion address module and data memory module, by frequency conversion address module, frequency-conversion processing is carried out to high frequency clock signal, to export variable frequency clock signal and the inquire address signal identical with the frequency of variable frequency clock signal, and, by input inquiry address signal in data memory module, export the drive singal identical with the frequency of variable frequency clock signal, frequency due to drive singal is not fixing, swing within the specific limits, thus when this LED driver is applied to LED display, the emittance of LED display can be made to disperse in certain frequency range, significantly reduce the EMI radiation of LED display, and then solve the serious technical matters of LED display radiation of the prior art.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the single link sequential chart of LED display of the prior art;
Fig. 2 is the schematic diagram of the LED driver according to the utility model embodiment;
Fig. 3 is the single link sequential chart of the LED display according to the utility model embodiment; And
Fig. 4 is the structural representation of the LED driver according to the utility model embodiment.
Embodiment
The utility model scheme is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the embodiment of the utility model part, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the utility model protection.
It should be noted that, term " first ", " second " etc. in instructions of the present utility model and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiment of the present utility model described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
When not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
Specific embodiment
According to the utility model embodiment, provide a kind of embodiment of the method that can implement by the application's device embodiment or perform, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing, and, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
According to the utility model embodiment, provide a kind of LED driver, the LED driver provided the utility model embodiment below does concrete introduction:
Fig. 2 is the schematic diagram of the LED driver according to the utility model embodiment, and as shown in Figure 2, this LED driver mainly comprises high frequency clock module 10, frequency conversion address module 20 and data memory module 30, wherein:
High frequency clock module 10 comprises output terminal of clock, for carrying out raising frequency process to the system clock frequency received, exports high frequency clock signal.
Particularly, high frequency clock module 10 carries out raising frequency process to the system clock frequency received, the preset frequency of extremely being mated with frequency conversion address module 20 by system clock frequency raising frequency by raising frequency process.
Frequency conversion address module 20 comprises input end of clock, inquire address output terminal and clock signal output terminal, input end of clock is electrically connected with the output terminal of clock of high frequency clock module 10, for carrying out frequency-conversion processing to high frequency clock signal, export variable frequency clock signal and inquire address signal, wherein, the variable frequency clock signal of output is identical with the clock period of inquire address signal.
Data memory module 30 comprises inquire address input end and drive singal output terminal, inquire address input end is electrically connected with inquire address output terminal, for inquiring about the activation bit for driving LED driving chip that it stores according to inquire address signal, export the drive singal identical with the clock period of variable frequency clock signal.
Particularly, in data memory module 30, store the display parameter of the display state for recording each LED lamp bead.Wherein, the display state of LED lamp bead at least comprises: light, extinguish, brightness.The display parameter that data memory module 30 is corresponding with inquire address signal according to the inquire address signal acquisition received, and the drive singal identical with the clock period of variable frequency clock signal generated is sent to LED drive chip, show with driving LED.
In the middle of practical application, frequency conversion address module, by counting high frequency clock, makes the clock period swing in the hunting range pre-set.Such as, first clock period is 20, and the high level of generation and low level respectively account for the low-frequency clock signal of 10 clock period.The second clock cycle is 18, then the high level produced and low level respectively account for the low-frequency clock signal of 9 clock period.By that analogy, the clock period can swing in the hunting range preset, and first hunting range can be decremented to 8 (20 from 20,18,16 ... 12,10,8), and then be incremented to 20 (8 from 8,10,12 ... 16,18,20), concrete hunting range and wobble accuracy can need to adjust according to system.
As shown in Figure 4, because variable frequency clock signal is obtained by frequency-conversion processing in frequency conversion address module 20 by high frequency clock signal, and above-mentioned drive singal is identical with the clock period of this variable frequency clock signal, even if the corresponding data address of each clock period.Wherein, data address corresponding within the clock period of a high frequency clock is identical, the clock period be 20 20 clock period corresponding same addresses, the clock period be 18 18 clock period another addresses corresponding.Between data and the low-frequency clock of generation, maintain the consistance of frequency like this, and between low-frequency clock and data, also strictly meet the consistance of phase place, namely as shown in Figure 3, the centre of the rising edge of low-frequency clock always corresponding data.
Further, due to the frequency of drive singal generated by above-mentioned LED driver, identical with the frequency of variable frequency clock signal, so, when LED drive chip receives variable frequency clock signal, can mate with variable frequency clock signal according to the frequency of the drive singal received.
In the middle of practical application, due in LED driver, the drive singal exported by data memory module 30 is identical with the clock period of variable frequency clock signal, and namely the clock period of drive singal neither be fixed, but swings within the specific limits.Thus when LED driver is applied to LED display, the emittance of LED display can be made to disperse in certain frequency range, significantly reduce the EMI radiation of LED display.
The LED driver that the utility model embodiment provides comprises high frequency clock module, frequency conversion address module and data memory module, by frequency conversion address module, frequency-conversion processing is carried out to high frequency clock signal, to export the variable frequency clock signal and inquire address signal with the identical clock period.Further, data memory module, according to the inquire address signal of input, exports the drive singal identical with the clock period of variable frequency clock signal, thus variable frequency clock signal and drive singal is matched.Due to, the clock period of drive singal is not fixed, and swings within the specific limits, thus when this LED driver is applied to LED display, the emittance of LED display can be made to disperse in the scope swung, significantly reduce the EMI radiation of LED display.
Preferably, in the utility model embodiment, high frequency clock module 10 is PLL phase-locked loop clock module.Wherein, PLL phase-locked loop clock has without residual frequency, good narrowband carrier tracking performance, good wide-band modulation tracking performance, good thresholding performance and is easy to the characteristic such as integrated, therefore, usually carry out unified integration time pulse signal with it, make the access data that internal memory energy is correct.
In the utility model embodiment, preferably, connect in the mode of series connection between multiple LED drive chip, wherein, drive singal output terminal and multiple LED drive chip of data memory module 30 are connected in series.Each LED drive chip can connect at most 16 LED lamp bead, and each pixel is made up of 3 ~ 4 lamp pearls, and therefore, each LED drive chip controls 4 ~ 5 pixels; Above-mentioned drive singal is input to each LED drive chip, makes LED drive chip go to control the tone of pixel, saturation degree and brightness.
Above-mentioned preferred embodiment in, the clock signal output terminal of frequency conversion address module 20 can be connected with each LED drive chip respectively.
Concrete, each LED drive chip controls 4 ~ 5 pixels, above-mentioned frequency conversion address module has multiple clock signal output terminal, thus the drive singal enabling a clock signal output terminal export is input to a LED drive chip, more effectively utilize the tone of LED drive chip control pixel, saturation degree and brightness.
Preferably, in the utility model embodiment, the signal frequency interval of the variable frequency clock signal exported by frequency conversion address module and inquire address signal is 9MHz-11MHz.When above-mentioned LED driver is applied to LED display, above-mentioned preferred signal frequency interval can make the emittance of LED display disperse in the frequency range of 9MHz-11MHz, thus effectively reduces the EMI radiation of LED display.
Above-mentioned preferred embodiment in, frequency-conversion processing can be carried out with predetermined frequency interval to variable frequency clock signal and inquire address signal.Concrete, in the middle of practical application, frequency interval can control according to the needs of control accuracy, both can be 0.1MHz, also can be 0.05MHz.When above-mentioned LED driver is applied to LED display, the frequency interval of setting can make the emittance of LED display disperse in the frequency range of 9MHz-11MHz further, more effectively reduces the EMI radiation of LED display.
In the utility model embodiment, LED driver can adopt FPGA programmable gate array chip to form.By using programmable gate array (FPGA) chip, achieve the raising frequency process to system clock frequency, the variable frequency clock signal of output and the frequency of the drive singal identical with the frequency of variable frequency clock signal is made not to be fixing, swing within the specific limits, thus when this LED driver is applied to LED display, the emittance of LED display can be made to disperse in certain frequency range, significantly reduce the EMI radiation of LED display.
Preferably, in the utility model embodiment, LED drive chip comprises: bit shift register, for receiving drive singal and variable frequency clock signal.Further, LED drive chip also comprises: export bolt lock device, be connected, for when latch signal is electronegative potential, carry out bolt-lock process to drive singal with bit shift register; Output driver, is connected with output bolt lock device, for when data output control signal is electronegative potential, exports drive singal.The bit shift register being built in LED drive chip in above-mentioned can convert the input data of serial to parallel output data formats with bolt-lock function.
According to another aspect of the present utility model, provide a kind of LED display, this LED display comprises LED, LED drive chip, system clock module and above-mentioned LED driver, this LED driver is connected with LED drive chip and system clock module respectively, system clock frequency for exporting system clock module carries out raising frequency and frequency-conversion processing, and by variable frequency clock signal and drive singal input LED drive chip, this LED drive chip connects LED, under the effect of variable frequency clock signal and drive singal, the emittance of LED display is disperseed in certain frequency range, significantly reduce the EMI radiation of LED display.
From above description, can find out, the utility model the above embodiments achieve following technique effect: the utility model provides the LED driver comprising high frequency clock module, frequency conversion address module and data memory module, wherein, by frequency conversion address module, frequency-conversion processing is carried out to high frequency clock signal, to export the variable frequency clock signal and inquire address signal with the identical clock period.Further, data memory module, according to the inquire address signal of input, exports the drive singal identical with the clock period of variable frequency clock signal, thus variable frequency clock signal and drive singal is matched.Due to, the frequency of drive singal is not fixed, and swings within the specific limits, thus when this LED driver is applied to LED display, the emittance of LED display can be made to disperse in the scope swung, significantly reduce the EMI radiation of LED display.
Obviously, those skilled in the art should be understood that, above-mentioned of the present utility model each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the utility model is not restricted to any specific hardware and software combination.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a LED driver, is connected with system clock module and multiple LED drive chip respectively, it is characterized in that, described LED driver comprises: high frequency clock module, frequency conversion address module and data memory module, wherein,
Described high frequency clock module comprises output terminal of clock, for carrying out raising frequency process to the system clock frequency received, exports high frequency clock signal;
Described frequency conversion address module comprises input end of clock, inquire address output terminal and clock signal output terminal, described input end of clock is electrically connected with the described output terminal of clock of described high frequency clock module, for carrying out frequency-conversion processing to described high frequency clock signal, export variable frequency clock signal and inquire address signal, wherein, the described variable frequency clock signal of output is identical with the frequency of described inquire address signal;
Described data memory module comprises inquire address input end and drive singal output terminal, described inquire address input end is electrically connected with described inquire address output terminal, for according to described inquire address signal to its store for driving the activation bit of described LED drive chip to inquire about, export the drive singal identical with the described frequency of described variable frequency clock signal.
2. LED driver according to claim 1, is characterized in that, connect in the mode of series connection between described multiple LED drive chip, wherein, described drive singal output terminal and described multiple LED drive chip of described data memory module are connected in series.
3. LED driver according to claim 2, is characterized in that, the described clock signal output terminal of described frequency conversion address module is connected with each LED drive chip respectively.
4. LED driver according to claim 1, is characterized in that, the described variable frequency clock signal of output and the signal frequency interval of described inquire address signal are 9MHz-11MHz.
5. LED driver according to claim 4, is characterized in that, carries out frequency-conversion processing with predetermined frequency interval to described variable frequency clock signal and described inquire address signal.
6. LED driver according to claim 1, is characterized in that, described high frequency clock module is PLL phase-locked loop clock module.
7. LED driver according to claim 1, is characterized in that, described LED driver adopts FPGA programmable gate array chip to form.
8. LED driver according to claim 1, is characterized in that, described LED drive chip comprises: bit shift register, for receiving described drive singal and described variable frequency clock signal.
9. LED driver according to claim 8, is characterized in that, described LED drive chip also comprises:
Export bolt lock device, be connected with described bit shift register, for when latch signal is electronegative potential, bolt-lock process carried out to described drive singal;
Output driver, is connected with described output bolt lock device, for when data output control signal is electronegative potential, exports described drive singal.
10. a LED display, is characterized in that, comprises the system clock module, LED driver, LED drive chip and the LED in claim 1 to 9 described in any one that connect successively.
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| CN201520790881.1U CN205069080U (en) | 2015-10-12 | 2015-10-12 | LED driver reaches LED display screen including it |
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| CN201520790881.1U CN205069080U (en) | 2015-10-12 | 2015-10-12 | LED driver reaches LED display screen including it |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185312A (en) * | 2015-10-12 | 2015-12-23 | 利亚德光电股份有限公司 | LED driver, LED display screen including the same and method for driving LED driving chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185312A (en) * | 2015-10-12 | 2015-12-23 | 利亚德光电股份有限公司 | LED driver, LED display screen including the same and method for driving LED driving chip |
| CN105185312B (en) * | 2015-10-12 | 2018-06-12 | 利亚德光电股份有限公司 | LED driver, including its LED display and LED drive chip driving method |
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