CN201562437U

CN201562437U - Integrated driving device used for LED advertisement display screen

Info

Publication number: CN201562437U
Application number: CN2009201339949U
Authority: CN
Inventors: 门洪达; 张伟; 冯根强; 权进国; 田道璟
Original assignee: SHENZHEN TITAN MICRO ELECTRONICS CO Ltd
Current assignee: SHENZHEN TITAN MICRO ELECTRONICS CO Ltd
Priority date: 2009-08-04
Filing date: 2009-08-04
Publication date: 2010-08-25
Anticipated expiration: 2019-08-04

Abstract

An integrated driving device used for LED advertisement display screen belongs to an LED driving control field for settling the problems of higher cost, complicated machining and easy damage in the driving method of displaying data of prior-art LED driving integrated circuit, which are caused by multiple components. The integrated driving device comprises a data buffering unit and a decoding control unit. A data output end of the data buffer unit is connected with a data input end of the decoding control unit. Through an integrated solution adopted by the utility model, the number of chips in each unit board is reduced for more than one half. Simultaneously because the chips are reduced, the circuit interconnection among the chips is reduced so that the machining cost is reduced remarkably. Some functions realized by the normal solution, such as protection function, are realized in the chip, therefore the device such as diode or capacitance resistor at the periphery of the normal chip is not required. Not only is cost reduced, but also the failure rate and maintenance cost are reduced.

Description

A kind of integrated driving device that is used for the LED ad display screen

Technical field

The utility model relates to a kind of integrated driving device of the LED of being used for ad display screen, belongs to LED drive controlling field.

Background technology

In the driving method of the video data of the LED drive integrated circult of present open air/indoor, generally use 74HC595 or MBI5026 to come the driving LED light emitting diode matrix, and above-mentioned array all adopts the mode of module, control 74HC595 in single module group unit or MBI5026 display part, usually the control model that adopts is that 74HC245,74HC138 and P-MOSFET 4953 form drive control part jointly and finish data transmission, show function such as distribution, but brings problems such as cost is higher, processed complex, easy damage owing to the more meeting of element.

The utility model content

Exist in the driving method for the video data that solves existing LED drive integrated circult because the more meeting of element causes that cost is higher, processed complex, the problem damaged easily, the utility model provides a kind of integrated driving device of the LED of being used for ad display screen, it comprises data buffer unit and encoded control unit, the data output end of data buffer unit is connected with the data input pin of encoded control unit, and is integrated in the same integrated circuit.

By the Integrated Solution that the utility model adopted, make that the chip number in each cell board reduces by more than 50, because the minimizing of chip reduces the interconnect of chip chamber, processing cost is obviously reduced simultaneously; Some functions that realize for original scheme as defencive function, owing to realize in the inside of chip, therefore need not to increase devices such as the diode of original chip periphery or capacitance-resistance, not only reduce cost and have also reduced failure rate and maintenance/maintenance cost.

Description of drawings

Fig. 1 is an one-piece construction synoptic diagram of the present utility model;

Fig. 2 is general LED display driver circuit structural representation;

Fig. 3 is the electrical block diagram of data buffer unit;

Fig. 4 is the electrical block diagram of decoding drive unit;

Fig. 5 is the electrical block diagram of short-circuit protection unit.

Embodiment

Embodiment one: as shown in Figure 1, this embodiment is made up of data buffer unit 1 and encoded control unit 2, and the data output end of data buffer unit 1 is connected with the data input pin of encoded control unit 2.

General LED driver module comprises part as shown in Figure 2 at present, comprises data buffering part, decoding drive part, short-circuit protection part etc. substantially.In this embodiment, data buffering part and decoding drive part are integrated in the same chip, solve the problem of package cooling simultaneously.

Data buffer unit 1 is used to finish the input data and amplifies to the buffering of output data, be used for the cascade of this chip, concrete circuit structure is as shown in Figure 3: circuit I 51, I53, I52, I96, I95, I50 constitute wherein one the tunnel and singly advance singly to go out buffer circuit, the buffering that is used for input data at the corresponding levels and output data at the corresponding levels, circuit I 63, I62, I98 constitute wherein one the tunnel and singly advance to have more buffer circuit (multichannel singly advance to have more buffer circuit singly advance to have more buffer circuit by a plurality of a tunnel forms), are used for the data of corresponding levels input are sent to encoded control unit 2 after cushioning.

Encoded control unit 2 is used to finish the 1/4 dutycycle decoding of LED sweep signal, drive corresponding PMOS circuit, concrete circuit structure is as shown in Figure 4: I7, I16, I32, I33 constitute wherein one road PMOS and drive decoding scheme (multichannel PMOS drive decoding scheme drive decoding schemes by a plurality of one road PMOS form), at AI, BI signal is that 00 o'clock and WDH signal are 0 (disable situation), drive corresponding PMOS pipe Y0, to light this row LED.Accordingly at AI, BI signal at 01 o'clock, I8, I18, I37, I36 drive PMOS pipe Y1; At 10 o'clock, I9, I21, I100, I102 drove PMOS pipe Y2 at AI, BI signal; At 11 o'clock, I10, I23, I101, I103 drove PMOS pipe Y3 at AI, BI signal.What provide in this embodiment is 2-4 road decoding scheme and P-MOSFET driving circuit; other has identical principle fully as 3-8 road decoding scheme, 4-16 road decoding scheme; wherein the WDH signal is the WDT that holding circuit is produced, and is used for LED and drives protection.

Embodiment two, as shown in Figure 1, this embodiment has increased short-circuit protection unit 3 on the basis of embodiment one, and the data input/output terminal of short-circuit protection unit 3 is connected with the data input/output terminal of encoded control unit 2.

For preventing that when sweep signal lacked, the working current of corresponding LED was excessive, cause that LED damages, this embodiment has increased short-circuit protection unit 3, and data buffering part, decoding drive part and short-circuit protection are partially integrated in the same chip.As shown in Figure 5, when AI, remaining unchanged for a long period of time of BI sweep signal, protected location can be sent control signal and give the encoded control unit, closes all PMOS.In the dot matrix of LED display,, when the sweep waveform of input does not change, can cause certain row fixedly to light owing to be that timesharing scanning shows.The LED lamp flows through peak point current for a long time, can be damaged or have a strong impact on the life-span, therefore must protect.Holding circuit is as shown in Figure 5: when sweep signal AI did not change for a long time, guard signal WDH drew high through after the some time, turns off PMOSFET, if this signal changes in limiting time, WDH is cleared, and counting restarts; Circuit I 248 oscillators produce the required CP clock signal of counting; Circuit I 176, I178, I177, I253 are that circuit is produced in the edge pulse, are used to detect the variation of AI signal, are to produce low level pulse when the AI signal changes, and come reset counter; Circuit I 199, I197, I179, I182, I183, I184, I185, I189 constitute counter, be used for to the indeclinable time counting of AI signal, when gate time then, the WDH high jump.

Claims

1. integrated driving device that is used for the LED ad display screen, it is characterized in that, it comprises data buffer unit (1) and encoded control unit (2), and the data output end of data buffer unit (1) is connected with the data input pin of encoded control unit (2), and is integrated in the same integrated circuit.

2. a kind of integrated driving device that is used for the LED ad display screen according to claim 1, it is characterized in that, described data buffer unit (1) comprises that multichannel singly advances to have more buffer circuit, and the data output end that multichannel singly advances to have more buffer circuit all is connected with the data input pin of encoded control unit (2) and is integrated in the same integrated circuit.

3. a kind of integrated driving device that is used for the LED ad display screen according to claim 1, it is characterized in that, described encoded control unit (2) comprises multiplex decoder and multichannel P-MOSFET driving circuit, the data input pin of multiplex decoder all is connected with the data output end of data buffer unit (1), the data input pin of the P-MOSFET driving circuit that the data output end of each road decoding scheme is corresponding with a tunnel respectively is connected, and is integrated in the same integrated circuit.

4. a kind of integrated driving device that is used for the LED ad display screen according to claim 1; it is characterized in that; it also comprises short-circuit protection unit (3); the data input/output terminal of short-circuit protection unit (3) is connected with the data input/output terminal of encoded control unit (2), and is integrated in the same integrated circuit.