CN207264754U

CN207264754U - LED display and its drive circuit

Info

Publication number: CN207264754U
Application number: CN201720979694.7U
Authority: CN
Inventors: 许明薛
Original assignee: Hangzhou Core Technology Co Ltd
Current assignee: Hangzhou Shixin Technology Co.,Ltd.
Priority date: 2017-08-07
Filing date: 2017-08-07
Publication date: 2018-04-20
Anticipated expiration: 2027-08-07

Abstract

Disclosure LED display and its drive circuit.The LED display shows the image of respective frame in continuous multiple frame periods, and the frame period includes multiple period of sub-frame.The LED display includes：At least one drive circuit；And the multiple LED light being connected with least one drive circuit, wherein, at least one drive circuit is sequentially connected in series, and drive circuit transmits data-signal one by one.The LED display once stores the data of position by only being transmitted before each frame period, and the data of transmission position are respectively transmitted during multiple subframes in each frame period, so as to reduce the memory space of drive circuit, reduces circuit cost.

Description

LED display and its drive circuit

Technical field

Display technology field is the utility model is related to, more particularly, to LED display and its drive circuit.

Background technology

The pixel element of LED display is light emitting diode (LED).LED display has the superiority of following aspect：It is high Grayscale, wide visible angle, abundant color and customizable screen shape.Therefore, light-emitting diode display is widely used in work The every field such as industry, traffic, commercial advertisement, information issue, sports tournament.

In LED display, multistage grayscale can be realized using electric current control method and ON time control methods.In electric current In control methods, its brightness is controlled by adjusting the size of current flowed through in LED.In ON time control methods, using constant current Driving, the brightness of LED is controlled by varying duty cycle.

Using ON time control methods, temporal expressions grayscale is lighted using accumulation of the LED light in each frame period, so that Carry out the display of image.In each frame period, for each LED light, there is provided multidigit corresponding with the respective pixel of image Luma data.The weight of each data bit of luma data corresponds to effective display time of LED light.Carried by turn from luma data Data bit is taken, is lighted or extinguished the corresponding effectively display time according to each data bit.In the whole frame period, LED light accumulation Effective lighting time it is consistent with the luma data of respective pixel.

LED display includes the drive circuit of multiple concatenations, by controlling the low and high level of drive circuit output terminal, point The LED light that bright or extinguishing is connected with drive circuit output terminal.

During operation, LED display receives data-signal DIN from control terminal.Drivings of the data-signal DIN in concatenation Transmitted step by step in circuit, each drive circuit can latch relative luma data.LED display is also terminated from control Receive and the matched enable signal EN of data-signal.Each drive circuit according to the data-signal DIN and enable signal EN received, Control drive end Out output low and high levels.

LED display updates screen-picture with fixed frame frequency.When showing image, it is necessary in a frame time Corresponding luma data is provided to each LED pixel and show in Tf.In order to improve visual effect, improve LED and show The refresh rate index of device by a frame time Tf, it is necessary to be subdivided into multiple timeslices, i.e., multiple subframes.Shown in traditional LED In driving method, drive circuit is during the image of display successive frame, full storage driving before next two field picture is shown The luma data of all LED light of circuit control.It is assumed that the luma data of LED display is 16Bit, LED display it is every The scanning number of two field picture is 16 times, and the drive output that drive circuit includes is usually 16, then a drive circuit is completely deposited The memory space that storing up the luma data of next two field picture needs is 16Bit*16*16, common 4096bit.

With the development of application, LED display needs to provide the grayscale of higher, and using the scanning number of higher, it is such as every The scanning number of two field picture is 32 times, this will cause memory space increasing built in drive circuit needs, circuit cost higher.

Expect further to improve LED display and its drive circuit, to reduce memory space and reduce circuit cost.

Utility model content

In view of this, the utility model embodiment provides a kind of new LED display and its drive circuit, by frame A part of luma data was transmitted and stored before cycle, to reduce the memory space of drive circuit.

First aspect according to the present utility model, there is provided a kind of driving method of LED display, the LED displays dress Put including at least one drive circuit, and the multiple LED light being connected with least one drive circuit, described at least one A drive circuit is sequentially connected in series, and drive circuit transmits data-signal one by one, and the LED display is shown in each frame period The image of respective frame, the frame period include multiple period of sub-frame, and the driving method includes：Luma data is divided into storage position With transmission position；Before each frame period starts, the storage position is transmitted using the data-signal, and deposit in the driving circuit Store up the data of the storage position；During the multiple subframe, the transmission position is transmitted using the data-signal, and by institute State storage position and the data group synthesis sub-frame data for transmitting position is shown, wherein, the multiple LED light is in each frame week Interim accumulation lighting time is corresponding with the luma data value that the data-signal represents.

Preferably, the luma data includes multiple data bit, and the position weight of the multiple data bit corresponds respectively to Effective display time in frame period.

Preferably, the high significance bit of the luma data is made as the storage position, the low order of the luma data For the transmission position.

Preferably, the position weight of the storage position is dispersed in the selected subframe or each subframe of the multiple subframe, The position weight of the transmission position is dispersed in the selected subframe of the multiple subframe.

Preferably, the drive circuit also receives shift clock, and under the control of the shift clock logarithm it is believed that Number shifted, to obtain the storage position and the transmission position.

Preferably, during the multiple subframe, lighted according to the luma data or extinguish the multiple LED light.

Second aspect according to the present utility model, there is provided a kind of LED display, in continuous multiple frame periods Show the image of respective frame, the frame period includes multiple period of sub-frame, and the LED display includes：At least one driving Circuit；And the multiple LED light being connected with least one drive circuit, wherein, at least one drive circuit according to Secondary concatenation, data-signal one by one drive circuit transmit, at least one drive circuit before each frame period starts, receive and Store the storage position of the data-signal, during the multiple subframe, receive the Data Data signal transmission position and The data group synthesis sub-frame data of the storage position and the transmission position is shown so that the multiple LED light is each Accumulation lighting time in frame period is corresponding with the luma data value that the data-signal represents.

Preferably, the drive circuit includes：Storage unit, for storing the storage position of the luma data；Latch single Member, for storing the transmission position of the luma data；Shift register group, under the control of shift clock signal, receiving Data-signal and data-signal is shifted in multiple registers of the shift register group, so as to obtain luma data； Selecting module is stored, for the storage position of the luma data and transmission position to be transmitted to the storage unit and the lock respectively Memory cell；Read module, for reading the storage position of the luma data from the storage unit；Display processing module, is used for Judge whether the transmission position of luma data, and there are during the transmission position, by the storage position of the luma data and Transmit hyte synthesis sub-frame data；And constant-current driven module, for providing driving current so that the multiple LED light is every Accumulation lighting time in a frame period is corresponding with the luma data value that the data-signal represents.

Preferably, the storage selecting module transmits the storage position of the luma data before each frame period starts To the storage unit, and during the multiple subframe, it is single that the transmission position of the luma data is sent to the latch Member.

Preferably, the drive circuit is during the multiple subframe, is lighted according to the luma data or described in extinguishing Multiple LED light.

The third aspect according to the present utility model, there is provided a kind of drive circuit of LED display, the drive circuit with Multiple LED light are connected, and show the image of respective frame in each frame period according to luma data, and the frame period includes multiple Period of sub-frame, the drive circuit include：Storage unit, for storing the storage position of the luma data；Latch units, are used for Store the transmission position of the luma data；Shift register group, under the control of shift clock signal, receiving the data Signal and the data-signal is shifted in multiple registers, so as to obtain luma data；Selecting module is stored, for dividing The storage position of the luma data and transmission position the storage unit and the latch units are not transmitted to；Read module, is used In the storage position that the luma data is read from the storage unit；Display processing module, for judging whether gray number According to transmission position, and there are it is described transmission position when, by the storage position of the luma data and transmission hyte synthesis number of sub frames According to；And constant-current driven module, for providing driving current so that accumulating point of the multiple LED light in each frame period The bright time is corresponding with the luma data value that the data-signal represents.

According to the driving method of the utility model embodiment, luma data is divided into two parts：Position and transmission position are stored, The data of the storage position are transmitted and stored before the frame period, and the data of the transmission position are transmitted during the subframe in frame period. The data of at least transmission position need not take the memory space inside drive circuit, be only transmitted during subframe, then Sub-frame data is combined into the storage bit number evidence prestored.The LED display can not only obtain preferable display performance, but also Memory space can be reduced.

Brief description of the drawings

By referring to description of the following drawings to the utility model embodiment, the above-mentioned and other mesh of the utility model , feature and advantage will be apparent from, in the accompanying drawings：

Fig. 1 is the schematic block diagram according to the LED display of the prior art.

Fig. 2 is the schematic block diagram of drive circuit in the LED display according to the prior art.

Fig. 3 is the schematic block diagram according to the LED display of the utility model embodiment.

Fig. 4 is the schematic block diagram of drive circuit in the LED display according to the utility model embodiment.

Fig. 5 is the sequence diagram according to the driving method of the LED display of the utility model embodiment.

Embodiment

Hereinafter reference will be made to the drawings is more fully described the utility model.In various figures, identical element is using similar Reference numeral represent.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.Furthermore, it is possible to it is not shown Some known parts.

In this application, term " storage position " represents only to transmit within a frame period to be once then stored in drive circuit Luma data position.Term " transmission position " represents that each subframe within a frame period repeats to transmit and not in drive circuit memory The luma data position of storage.

Fig. 1 is the schematic block diagram of the LED display of the prior art.The LED display includes control terminal 110 and more A LED module 310.The multiple module 310 is for example sequentially connected in series.Each LED module 310 includes the multiple drivings being sequentially connected in series Circuit 211, and it is arranged in multiple LED light 212 of array.

In each LED module 310, the multiple drive circuit 211 is respectively used to drive connected multiple LED light 212, for showing a part of region of image.The multiple module 310 is respectively used to the image of display different zones, from And complete image can be spliced into jointly.

Control terminal 110 provides data-signal DIN, shift clock DCLK and counting clock GCLK to the multiple module.

Above-mentioned shift clock DCLK and counting clock GCLK send each drive in each module 310 to from control terminal 110 The corresponding shift signal end DClk and count signal end GClk of dynamic circuit 211.

Module transmits data-signal DIN one by one.Data-signal DIN is used for the luma data for representing pixel.In each module Inside 310, drive circuit 211 transmits data-signal DIN one by one.Since control terminal 110, data-signal DIN is first provided to The data input pin Din of first drive circuit 211 of first LED module 310, and multiple drives in the LED module 310 Transmit in dynamic circuit, exported via the data output end Dout of last drive circuit successively.Then, data-signal DIN It is supplied to second LED module.Each LED modules of the data-signal DIN through concatenation is transmitted successively, and upper level LED module is output to First drive circuit of this grade of LED module, last drive circuit of this grade of LED module are output to next stage LED module First drive circuit.Last drive circuit of afterbody LED module then not outputting data signals.

In each LED module, the anode tap of multiple LED light 212 connects power vd D respectively, and cathode terminal connection is corresponding The drive output Out of drive circuit 210.When drive output Out provides drop-down constant current, i.e. lightening LED lamp 212.

In the LED display, LED module includes respective drive circuit.In each subframe within a frame period, Control terminal repeats to transmit luma data position to the drive circuit of LED module.Therefore, all gray numbers in the LED display All it is storage position according to position.

Fig. 2 is the schematic block diagram of drive circuit in the LED display according to the prior art.The drive circuit 211 wraps Include shift register group 2111, storage unit 2112, PWM module 2113 and drive module 2114.

Shift register group 2111 receives shift clock signal DCLK by shift signal end DClk from control terminal 110, leads to Cross the data that data signal input Din receives the data output end Dout offers of control terminal 110 or upper level drive circuit 210 Signal.Shift register group 2111 receives data-signal Din, and under the control of shift clock signal DCLK, data-signal Din exists Shifted in multiple registers in shift register group 2111, export via data signal output Dout and driven to next stage Dynamic circuit or next stage LED module.The luma data of reception is being locally stored in storage unit 2112.PWM module 2113 utilizes meter Number clock GCLK is counted, and count value is consistent with the value of luma data, so as to produce pulse-width signal.Therefore, pulse The duty cycle of modulated signal is consistent with the value of luma data.For example, the luma data of LED display is 16Bit, drive circuit Read some LED light in next two field picture luma data value be 249, then the drive circuit in next frame image display, The duty cycle for controlling the drive end being connected with the LED light to export one 249/65535.Drive module 2114 exists according to pwm signal Each drive output Out provides drop-down constant current, thus control LED light 212 light/extinguish and its duration.

Fig. 3 is the schematic block diagram according to the LED display of the utility model embodiment.The LED display includes Control terminal 110 and multiple LED modules 310.The multiple module 310 is for example sequentially connected in series.Each LED module 310 is included successively Multiple drive circuits 311 of concatenation, and it is arranged in multiple LED light 212 of array.

In each LED module 310, the multiple drive circuit 311 is respectively used to drive connected multiple LED light 212, for showing a part of region of image.The multiple module 310 is respectively used to the image of display different zones, from And complete image can be spliced into jointly.

Control terminal 110 provides data-signal DIN and shift clock DCLK to the multiple module.

Above-mentioned shift clock DCLK sends the corresponding of each drive circuit 311 in each module 310 to from control terminal 110 Shift signal end DClk.

Module transmits data-signal DIN one by one.Data-signal DIN is used for the luma data for representing pixel.In each module Inside 310, drive circuit 311 transmits data-signal DIN one by one.Since control terminal 110, data-signal DIN is first provided to The data input pin Din of first drive circuit 311 of first LED module 310, and multiple drives in the LED module 310 Transmit in dynamic circuit, exported via the data output end Dout of last drive circuit successively.Then, data-signal DIN It is supplied to second LED module.Each LED modules of the data-signal DIN through concatenation is transmitted successively, and upper level LED module is output to First drive circuit of this grade of LED module, last drive circuit of this grade of LED module are output to next stage LED module First drive circuit.Last drive circuit of afterbody LED module then not outputting data signals.

In the LED display of the embodiment, control terminal is sent next by data-signal DIN after transmission switches The luma data storage position of two field picture, wherein transmission switching need to be in all data bit of current frame image, including storage position and transmission Position carries out after being transmitted.

Present frame carries out display switching after the completion of showing, control terminal is shown by data-signal DIN in transmission position Previous subframe sends the transmission position.After all transmission positions are transmitted, control terminal is transmitted switching, and in the manner described above Carry out the transmission of next frame image data.

Drive circuit reads the data value of storage position when being shown, and receives the data value of transmission position.Further Ground, drive circuit will store position and transmission hyte synthesis sub-frame data.Corresponding drive is determined according to the data value of sub-frame data Whether dynamic output terminal OUT exports drop-down constant current and pulls down the duration of constant current.

Preferably, in the case of driving by turn, corresponding driving is determined according to the bit data value 0 or 1 of luma data Whether output terminal OUT exports drop-down constant current.That is, when bit data value is 0, the corresponding drive output OUT is controlled not export Constant current is pulled down, the LED light being connected with the drive output is turned off；When bit data value is 1, corresponding drive output is controlled OUT exports the drop-down constant current consistent with the duration of the position weight expression of luma data, the LED light quilt being connected with the drive output Open.

Likewise, drive circuit is when being shown, it is corresponding to determine according to the bit data value of the transmission position received Whether drive output Out exports drop-down constant current and pulls down the duration of constant current.

Fig. 4 is the schematic block diagram of drive circuit in the LED display according to the utility model embodiment.Driving electricity Road 311 includes shift register group 2111, storage selecting module 3111, storage unit 2112, latch units 3112, read module 3113rd, Display processing module 3114, PWM module 2113 and drive module 2114.

Shift register group 2111 receives clock signal by shift clock signal end DClk from control terminal 110, passes through number The data that the data output end Dout offers of control terminal 110 or upper level drive circuit 210 are received according to signal input part Din are believed Number.Under the control of shift clock signal DCLK, in multiple registers of the data-signal Din in shift register group 2111 into Row displacement, exports to next stage drive circuit or next stage LED module via data signal output Dout.

Display data is stored or latched by storage selecting module 3111.For example, in all data bit of current frame image The end of transmission and be transmitted after switching, control terminal sends next two field picture before next frame image display starts Luma data stores position, and the selecting module 3111 that stores is by the luma data write storage unit of shift register propagation 2112.During a two field picture is shown, if next subframe has transmission position, control terminal sends the luma data transmission of next subframe The data of shift register propagation are latching to latch units by position, data write-in control module control storage selecting module 3111 3112, in case next subframe uses when showing.

Read module 3113, which reads present sub-frame, needs storage position to be shown, and passes to Display processing module 3114.

Display processing module 3114 judges whether present sub-frame has transmission position to need to be shown, if any then luma data Storage position and transmission hyte synthesis sub-frame data, the data control PWM module 2113 and drive module obtained according to foregoing 2114 are driven display, drop-down constant current and its duration are provided in each drive output Out, so as to control LED light 212 Light/extinguish and its duration.

According to the drive circuit of the utility model embodiment, during the display of every two field picture, by part gray-scale data bit As the storage of storage position in the driving circuit, part gray-scale data bit by subframe is transmitted so that LED as transmission position Display device can not only obtain preferable display performance, but also can reduce memory space.

In order to express easily, by taking 10Bit luma datas as an example to the utility model proposes driving method make furtherly It is bright.10Bit luma datas are denoted as D [0:9], the weight of data bit can use 2ⁿTo represent.Assuming that luma data is minimum effectively The weight W [0] of position corresponding effectively display time is 1, then the weight W [i] of each data bit D [i] corresponding effectively display times For 2ⁱ- 1, as shown in table 1：

The weight of table 1, in the prior art 10 luma data difference positions

Data bit	D[0]	D[1]	D[2]	D[3]	D[4]	D[5]	D[6]	D[7]	D[8]	D[9]
											Weight W	1	2	4	8	16	32	64	128	256	512

If the luma data least significant bit corresponding effectively display time is t.According to the weight of data bit, each grayscale The data bit corresponding effectively display time is as shown in table 2：

Table 2, in the prior art 10 luma data difference positions corresponding effectively display time

Data bit

D[0]

D[1]

D[2]

D[3]

D[4]

D[5]

D[6]

D[7]

D[8]

D[9]

Effective time

t

2t

4t

8t

16t

32t

64t

128t

256t

512t

By high 7 D [3 of luma data:9] as storage position, low 3 D [0] of luma data, D [1], D [2], which are used as, to be passed Defeated position；And a frame time Tf is subdivided into 32 timeslices, i.e. 32 subframes.Again storage position D [3:9] 4 storages are split as High-order D [6:9] and 3 store low level D [3:5], the high-order luma data position shown for each subframe of storage, storage are low Position is the luma data position that only part subframe is shown.

Due to storing high position D [6:9] each subframe is shown, therefore stores high-order in each subframe effectively aobvious Show that the time is as shown in table 3.

High-order effective display time is stored in table 3, each subframe

Data bit	D[9]	D[8]	D[7]	D[6]
					Calendar time	512t	256t	128t	64t
Number of sub frames	32	32	32	32
					Effective time	16t	8t	4t	2t

Store low level D [3:5] occurrence number in 32 subframes and effective display time can be as shown in tables 4.

Table 4, the subframe arrangement for storing low level and effective display time

Data bit	D[5]	D[4]	D[3]
				Calendar time	32t	16t	8t
Number of sub frames	16	8	4
				Effective time	2t	2t	2t

As shown in Table 4, the number that storage low level occurs in 32 subframes is 16+8+4, is amounted to 28 times.In 32 subframes 4 subframes are there remains, may be used as the display of transmission position D [0], D [1], D [2].10Bit luma datas D [0:9] in each subframe The middle order arrangement shown and effective display time can be as shown in table 5.

Table 5, luma data arrangement example

As shown in table 5, high position D [6 is stored:9] effective display time is dispersed in 32 subframes；Store low level D [5] 16 subframes in 32 subframes occur, and to make display uniform, every 2 subframes occur once；Low level D [4] is stored at 32 8 subframes in subframe occur, i.e., every 4 subframes occur once；4 subframes of the storage low level D [3] in 32 subframes go out Existing, i.e., every 8 subframes occur once.This 32 subframes are divided into 4 groups, every one group of 8 subframes, storage position is uniformly after arrangement, often The vacant subframe position of one group of subframe, can be used to show transmission position.Wherein, the vacant position of first and third group of subframe is used for Display transmission position D [2], effectively shows that the time is 2t；The vacant position of second group of subframe is used for showing transmission position D [1], effectively aobvious It is 2t to show the time；The vacant position of 4th group of subframe is used for showing transmission position D [0], effectively shows that the time is t.

In this way, the display of 10 luma datas shown in table 2 can be completed.

, it is necessary to which luma data position is being carried out display front transfer in place in LED display, wherein storage position needs in advance Preserving to the storage unit 2112 of drive circuit, transmission position should transmit in place, in the situation without considering scanning when showing and starting Under, it should be transmitted in the previous subframe of shown subframe.Therefore in the case of without considering scanning, 10Bit luma datas are such as It need to be shown as the order shown in table 5, then：Store position D [3:9] need to complete transmission before the display of this two field picture starts and deposit Storage, transmission position D [0], D [1], D [2] need to be transmitted before the subframe each shown.As shown in table 5, position D [2] is transmitted Shown in subframe 2 and subframe 18, transmission position D [1] is shown in subframe 10, and transmission position D [0] is shown in subframe 26, then：Transmit position D [2] should be transmitted in subframe 1 and subframe 17, and transmission position D [1] should be transmitted in subframe 9, and transmission position D [0] should be in subframe 25 are transmitted；And remaining subframe need to only read stored data bit in display, the demand not carried out data transmission, because This, the subframe that can not have transmission demand using these carries out the transmission that next frame image gray-scale level data store position.For example, storage Position D [3:9] it can be transmitted and store during 26~subframe of subframe 32 of previous frame image.Table 6 show above-mentioned 10Bit ashes Exponent number evidence program process, its time diagram in the transmission display in the case of without considering scanning is as shown in Figure 2.

Table 6, luma data transmission and display sequential example

In above-described embodiment, drive circuit needs storage data to be reduced to 7Bit by original 10Bit, is needed inside circuit Memory space by original 10Bit* scannings number * 16, be reduced to 7Bit* scanning numbers * 16, required memory space reduces 30%.

Above-described embodiment is by taking 10Bit luma datas as an example, statement merely for convenience, for the more multidigit in practical application Luma data, can be extended.When luma data position increases, the digit of transmission position can be increased, or increase stores low level Digit, expansion sub-frame number etc..For example, 16Bit luma datas, can have 4 transmission positions, 12 storage positions, wherein 8 are storage A high position, 4 are to store low level, number of sub frames 64.As long as ensure to transmit all storage positions in place i.e. before display switches Can, i.e., before next frame image display is carried out, there are enough subframes that need not transmit transmission position to carry out next two field picture ash The transmission of the storage position of exponent number evidence.Also, can be by changing transmission position, storing position in the case of given memory space Digit, to change the luma data digit of support, for example reaches and supports more high gray, the situation of such as 18Bit luma datas.

The digit for the luma data stated in the utility model embodiments of the disclosure, storage is high-order, stores low level and biography The digit of defeated position is example, and transmits and do not consider to scan in example.Those skilled in the art can utilize the prior art, with reference to this reality With new, different digit selections is carried out, different weights is set, increase scanning number, the also position in alterable subframe and weight Arrangement, and the transmission location of luma data position.

The utility model proposes a kind of driving method, its basic way is to be split n luma datas：Wherein A positions it is high-order as storage, be stored in inside drive circuit, and each subframe is shown；B therein as storage Low level, is stored in inside drive circuit, and part subframe is shown；Remaining n-a-b luma data low level is not required to as transmission position The memory space inside drive circuit is taken, is transmitted in the previous subframe for needing to be shown.

The LED driving methods and display system of above-described embodiment, it is increasing to be both well positioned to meet LED display The performance indicators such as refresh rate, gray level, and the memory space needed for drive circuit is effectively reduced, improve system display property Energy and display effect.

Although the utility model embodiment is disclosed as above with preferred embodiment, its be not for limiting claim, Any those skilled in the art without departing from the spirit and scope of the utility model, can make possible variation and repair Change, therefore the scope of protection of the utility model should be subject to the scope that the utility model claims are defined.

The above is only the preferred embodiment of the present invention, is not intended to limit the present invention, for this area For technical staff, the utility model can have various modifications and changes.All institutes within the spirit and principle of the utility model Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of protection of this utility model.

Claims

1. a kind of LED display, it is characterised in that for showing the image of respective frame, institute in continuous multiple frame periods Stating the frame period includes multiple period of sub-frame, and the LED display includes：

At least one drive circuit；And

The multiple LED light being connected with least one drive circuit,

Wherein, at least one drive circuit is sequentially connected in series, and drive circuit transmits data-signal one by one,

At least one drive circuit receives and stores the storage position of the data-signal before each frame period starts, During the multiple subframe, the transmission position of the Data Data signal and the number by the storage position and the transmission position are received Shown according to sub-frame data is combined into so that accumulation lighting time of the multiple LED light in each frame period with it is described The luma data value that data-signal represents is corresponding.

2. LED display according to claim 1, it is characterised in that the luma data includes multiple data bit, institute The position weight for stating multiple data bit corresponds respectively to effective display time in a frame period.

3. LED display according to claim 2, it is characterised in that the high significance bit of the luma data is as institute Storage position is stated, the low order of the luma data is as the transmission position.

4. LED display according to claim 3, it is characterised in that the position weight of the storage position is dispersed in described In the selected subframe or each subframe of multiple subframes, the position weight of the transmission position is dispersed in the selected son of the multiple subframe In frame.

5. LED display according to claim 1, it is characterised in that the drive circuit includes：

Storage unit, for storing the storage position of the luma data；

Latch units, for storing the transmission position of the luma data；

Shift register group, under the control of shift clock signal, receiving data-signal and to data-signal described Shifted in multiple registers of shift register group, so as to obtain luma data；

Selecting module is stored, for the storage position of the luma data and transmission position to be transmitted to the storage unit and institute respectively State latch units；

Read module, for reading the storage position of the luma data from the storage unit；

Display processing module, for judging whether the transmission position of luma data, and there are during the transmission position, by institute State storage position and the transmission hyte synthesis sub-frame data of luma data；And

Constant-current driven module, for providing driving current so that when accumulation of the multiple LED light in each frame period is lighted Between with the data-signal represent luma data value it is corresponding.

6. LED display according to claim 5, it is characterised in that the storage selecting module is in each frame period Before beginning, the storage position of the luma data is sent to the storage unit, and during the multiple subframe, by described in The transmission position of luma data is sent to the latch units.

7. LED display according to claim 1, it is characterised in that the drive circuit is in the multiple subframe phase Between, lighted according to the luma data or extinguish the multiple LED light.

A kind of 8. drive circuit of LED display, it is characterised in that the drive circuit is connected with multiple LED light, according to Luma data shows the image of respective frame in each frame period, and the frame period includes multiple period of sub-frame, the driving electricity Road includes：

Storage unit, for storing the storage position of the luma data；

Latch units, for storing the transmission position of the luma data；

Shift register group, under the control of shift clock signal, receiving the data-signal and believing the data Number shifted in multiple registers, so as to obtain luma data；

9. drive circuit according to claim 8, it is characterised in that the storage selecting module starts in each frame period Before, the storage position of the luma data is sent to the storage unit, and during the multiple subframe, by the grayscale The transmission position of data is sent to the latch units.