CN203338715U

CN203338715U - LED large screen display module

Info

Publication number: CN203338715U
Application number: CN201320093621XU
Authority: CN
Inventors: 乔红瑗; 杨晓鹏; 谢维奇; 丁佳卿
Original assignee: SHANGHAI DOUBLE MICROELECTRONICS CO Ltd
Current assignee: SHANGHAI DOUBLE MICROELECTRONICS CO Ltd
Priority date: 2013-03-01
Filing date: 2013-03-01
Publication date: 2013-12-11
Anticipated expiration: 2023-03-01

Abstract

The utility model discloses an LED large screen display module, comprising large screen display diodes a driving chip, and the large screen display diodes and the driving chip are seal together. The beneficial effects are that: the LED light-emitting diode is sealed along with a driving control chip thereof. The large screen display module is not needed to be externally connected to a driving control circuit and is not needed to be connected to each LED diode through the driving circuit. The LED large screen display module can be driven by simply connecting to a simply serial bus and a power supply. The LED large screen display module greatly improves the level of integration of the LED large screen display module, and realizes miniaturization of the big screen and high density. Furthermore, the LED large screen display module also has advantages of ultra small point distance, low cost, light weight, easy assembly and easy maintenance.

Description

LED large screen display module

Technical field

The utility model relates to LED large screen display field.

Background technology

As shown in Figure 1, existing LED shows that giant-screen consists of the following components, the lamp plate formed by the LED light emitting diode matrix, by comprising the control panel that drives chip, scanning control chip, bus driver chip, coding chip, Bussing connector to form, between control panel and lamp plate, by connector, connected.Along with the point of the development giant-screen of LED giant-screen apart from (being the spacing of neighbor on giant-screen) gradually to the miniaturization development, narrow down to 10mm, 6mm, 4mm etc. by 16mm.The picture element density of LED giant-screen is more and more higher, and the shared Area Ratio of the control circuits such as various driving chips, scanning control chip, coding chip is increasing.Seriously restricted the progress of miniaturization of LED giant-screen.

The utility model content

The technical problems to be solved in the utility model is to provide a kind of LED large screen display module, and it can realize the miniaturization of LED giant-screen.

For solving above technical matters, the utility model provides a kind of LED large screen display module, comprises the large screen display diode and drives chip; The large screen display diode is together with the driving chip package.

This beneficial effect is: the LED light emitting diode and and drive control chip to be packaged together, without external Drive and Control Circuit, without be wired to each LED diode from driving circuit, only need the simple universal serial bus of simple connection and power supply to drive, improved greatly the integrated level of LED demonstration giant-screen, make LED show that miniaturization, the high density of giant-screen become possibility, have advantages of extra small, assembling low, lightweight apart from, cost simply, easy access.

LED large screen display module LED scanning drive chip used by LED constant-current driven chip, LED scanning control chip, decoding scheme, bus driving circuits is integrated forms.

The scan control section of LED scanning drive chip has high-speed blanking LED giant-screen scanning monitor, comprising: the LED giant-screen drives chip, and the LED giant-screen drives chip to connect code translator; Code translator is decoding control signal, and code translator connects the Pmos switching tube as power switch, Pmos switch controlled several rows LED voltage; Include the Nmos pull-down circuit in described scan control circuit.

Described Nmos pull-down circuit is a pulse pull-down circuit, at Pmos, closes to have no progeny to produce the high level pulse of a short time; Pmos switching tube grid end control end PmosGate controls the Pmos switching tube and turn-offs when high level, and mos switching tube grid end control end PmosGate controls the Pmos switching tube and opens when low level; Control the Nmos switching tube when under Nmos, trombone slide grid end control end NmosGate is high level and open, Nmos switching tube grid end control end NmosGate controls the Pmos switching tube and turn-offs when low level; Reach Pmos pipe pass from low level becomes high level has no progeny when Pmos grid end, produce a high level pulse by blanking control circuit at the grid end of Nmos pipe, open the Nmos pipe in the very short time scanning power supply Vx is discharged over the ground, drag down the Vx terminal voltage, accelerated scan power supply Vx turn-off speed.

Also comprise that the Pmos switching tube crosses current circuit and/or overheating protection circuit, it turn-offs the Pmos switching tube after the controller overcurrent overheat.The constant current drive part pre-charging functions of LED scanning drive chip can hold level to be set to a level (for example VDD-1.4 volt) that is less than VDD by OUTn when constant current drives passage OUTn to turn-off.

Described code translator is from the LED giant-screen, driving the double-wire signal of chip to be decoded as control signal.

Described large screen display diode forms 8 * 8 array.

The accompanying drawing explanation

Below in conjunction with drawings and Examples to originally being described in further detail.

Fig. 1 is the wiring diagram of existing LED demonstration giant-screen;

Fig. 2 the utility model LED large screen display module wiring diagram;

Fig. 3 the utility model LED large screen display module front view;

Fig. 4 is the half-sectional view of Fig. 3;

Fig. 5 is the side view of Fig. 3;

Fig. 6 is the opposite side view of Fig. 3;

Fig. 7 is power switch circuit block diagram described in the utility model.

Embodiment

As shown in Fig. 2-6, the various control circuits that the utility model will drive for LED are integrated into the LED scanning drive chip of an integral body, LED scanning drive chip and LED light emitting diode matrix are encapsulated in a packaging body, and logical serial bus interface just can directly drive, without external drive circuit.Comprise: for the some matrix LED diode of LED large screen display, the Drive and Control Circuit of LED diode, it is connected with described light emitting diode, and drives this light emitting diode.

Module LED scanning drive chip used by LED constant-current driven chip, LED scanning control chip, decoding scheme, bus driving circuits is integrated forms.The scan control section of led scanning drive chip has blanking to control function, and the electric Vx of row closes in source and has no progeny and can discharge to output terminal.The constant current drive part pre-charging functions of led scanning drive chip: when constant current drives passage OUTn to turn-off to be, can hold OUTn level to be lifted to a level that is less than VDD when this level (for example VDD-1.4 volt).The utility model by the LED light emitting diode and and drive control chip to be packaged together, without external Drive and Control Circuit, without be wired to each LED diode from driving circuit, only need the simple universal serial bus of simple connection and power supply to drive, improved greatly the integrated level of LED demonstration giant-screen, make LED show that miniaturization, the high density of giant-screen become possibility, have advantages of extra small, assembling low, lightweight apart from, cost simply, easy access.

As shown in Figure 7, high-speed blanking LED giant-screen scanning monitor comprises: the LED giant-screen drives chip, and the LED giant-screen drives chip to connect code translator; Code translator is decoding control signal, and code translator connects the two Pmos pipes as power switch, two Pmos management and control several rows LED processed voltage; Include voltage pull-down circuits in described pair of Pmos pipe circuit.

Described Nmos pull-down circuit is a pulse pull-down circuit, at Pmos, closes to have no progeny to produce the high level pulse of a short time; Pmos switching tube grid end control end PmosGate controls the Pmos switching tube and turn-offs when high level, and Pmos switching tube grid end control end PmosGate controls the Pmos switching tube and opens when low level; Control the Nmos switching tube when under Nmos, trombone slide grid end control end NmosGate is high level and open, Nmos switching tube grid end control end NmosGate controls the Pmos switching tube and turn-offs when low level; Reach pmos pipe pass from low level becomes high level has no progeny when Pmos grid end, produce a high level pulse by blanking control circuit at the grid end of Nmos pipe, open the Nmos pipe in the very short time scanning power supply Vx is discharged over the ground, drag down the Vx terminal voltage, accelerated scan power supply Vx turn-off speed.

Also comprise that the Pmos switching tube crosses current circuit and/or overheating protection circuit, it turn-offs the Pmos switching tube after the controller overcurrent overheat.Described code translator is from the LED giant-screen, driving the double-wire signal of chip to be decoded as control signal.

The utility model adds pull-down circuit, closes at PMOS a power line voltage of having no progeny and drags down rapidly to guarantee correctly to show in the next frame data.The utility model improves two Pmos pipes increases pull-down circuit, at two Pmos pipes, closes and has no progeny, and utilizes pull-down circuit to drag down rapidly V1 ~ V4 voltage, improves power supply Vx turn-off speed.Pull-down circuit is exactly a Nmos pipe, and whole circuit block diagram is shown in Fig. 7.The Nmos pull-down circuit is a pulse pull-down circuit, at Pmos, closes to have no progeny to produce the high level pulse of a short time at once.PmosGate is Pmos switching tube grid end control end, and its high level Pmos switching tube turn-offs, and the low level switching tube is opened.NmosGate is trombone slide grid end control end under Nmos, and high level is opened, and low level is turn-offed.Produce a high level pulse by blanking control circuit at the grid end of Nmos pipe and open the Nmos very short time of pipe scanning power supply Vx is discharged over the ground when Pmos deletes from low level becomes high level (and pmos pipe close have no progeny).Drag down rapidly the Vx terminal voltage) accelerated scan power supply Vx turn-off speed.

The utility model increases blanking control circuit and utilizes input control signal to produce the pulse pulldown signal, at the Pmos pipe, closes to have no progeny to generate a very short drop-down pulse of time at once and open the very short reality of Nmos pipe (1 microsecond left and right) to drag down rapidly the low output terminal of power switch be the VX terminal voltage.

The utility model is not limited to embodiment discussed above.The above description to embodiment is intended in order to describe and illustrate the technical scheme that the utility model relates to.Apparent conversion based on the utility model enlightenment or substitute and also should be considered to fall into protection domain of the present utility model.Above embodiment is used for disclosing best implementation method of the present utility model, so that those of ordinary skill in the art can apply numerous embodiments of the present utility model and multiple alternative reaches the purpose of this utility model.

Claims

1. a LED large screen display module, is characterized in that, comprises the large screen display diode and drive chip; The large screen display diode is together with the driving chip package.

2. LED large screen display module as claimed in claim 1, is characterized in that, LED large screen display module LED scanning drive chip used by LED constant-current driven chip, LED scanning control chip, decoding scheme, bus driving circuits is integrated forms.

3. LED large screen display module as claimed in claim 2, is characterized in that, the scan control section of LED scanning drive chip has high-speed blanking LED giant-screen scanning monitor, comprising: the LED giant-screen drives chip, and the LED giant-screen drives chip to connect code translator; The code translator decoding control signal, code translator connects the Pmos switching tube as power switch, Pmos switch controlled several rows LED voltage; Include the Nmos pull-down circuit in described scanning monitor.

4. LED large screen display module as claimed in claim 3, is characterized in that, comprises that the Pmos switching tube crosses current circuit and/or overheating protection circuit, and it turn-offs the Pmos switching tube after the controller overcurrent overheat.

5. LED large screen display module as claimed in claim 4, is characterized in that, the constant current drive part pre-charging functions of LED scanning drive chip can hold level to be set to a level that is less than VDD by OUTn when constant current drives passage OUTn to turn-off.

6. LED large screen display module as claimed in claim 5, is characterized in that, when constant current drives passage OUTn to turn-off, can hold level to be set to the VDD-1.4 volt by OUTn.

7. LED large screen display module as claimed in claim 6, is characterized in that, described code translator is from the LED giant-screen, driving the double-wire signal of chip to be decoded as control signal.

8. LED large screen display module as claimed in claim 7, is characterized in that, described large screen display diode forms 8 * 8 array.