CN107403603B

CN107403603B - Control circuit of LED scanning display screen

Info

Publication number: CN107403603B
Application number: CN201710873057.6A
Authority: CN
Inventors: 陈磊
Original assignee: YUN ZHI TECHNOLOGY Co Ltd OF SHENZHEN CITY
Current assignee: YUN ZHI TECHNOLOGY Co Ltd OF SHENZHEN CITY
Priority date: 2017-09-22
Filing date: 2017-09-22
Publication date: 2020-03-17
Anticipated expiration: 2037-09-22
Also published as: CN107403603A

Abstract

The invention discloses a control circuit of an LED scanning display screen, which comprises an LED lamp; the driving chip is used for signal control of the row tube, is provided with three data input pins including DIN, CLK and LAT and is used for being connected with an external LED control system, and is also provided with an OE pin, a DOUT pin, a plurality of OUT output pins, and the OE pin is independently grounded; the driving chip used for controlling the LED lamp is the same as the driving chip used for controlling the signal of the row tube; the driving chip used for the control of the row tube signal and the driving chip used for the control of the LED lamp use the same group of LAT and CLK signals connected to the outside, and the DOUT pin of the driving chip used for the control of the row tube signal is connected with the DIN pin of the driving chip used for the control of the LED lamp; and the OUT output pin of the driving chip used for controlling the signal of the row tube and the OUT output pin of the driving chip used for controlling the LED lamp are connected with the LED lamp through the MOSFET (metal-oxide-semiconductor field effect transistor) control. The invention has the advantages of simple wiring, material saving, cost reduction and good control performance.

Description

Control circuit of LED scanning display screen

Technical Field

The invention relates to the field of LED control circuit design, in particular to a control circuit of an LED scanning display screen.

Background

At present, when an LED display screen is designed as a scanning screen body, a driving chip is usually used to control the display of an LED lamp, a rowtube chip and a decoding chip are used to control the on-off time of each scanning segment of the LED lamp, or a direct control mode is used when a light bar type low-break scanning screen body is designed. For example, the conventional practice of 4-segment scanning requires 6 signal line inputs; if 16 scans are required, 8 signal inputs are required, and 8 signals must traverse from head to tail in the layout of the entire PCB.

The disadvantages of this solution are:

1. the types of chips to be prepared are many, and the chips include a driving chip, a pipelining chip and a decoding chip.

2. The wiring cost is high. Each chip needs to be used independently for providing input and output signals, and the screen body is difficult to design according to the premise of optimal performance under the condition of limited board layers, otherwise more board layers need to be added to meet the performance requirement. Even if the pipelining chip is not applicable, assuming a 4-segment scan pass-through decoding method, an additional 4 input signals are required.

Disclosure of Invention

The invention mainly aims to solve the problems that in the design process of an LED screen body, the wiring space of a high-section scanning or lamp bar type LED scanning screen body is insufficient, more board layers are needed, and the performance of partial electric appliances is reduced.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

control circuit of LED scanning display screen, including:

an LED lamp configured as a control object of the control circuit;

the driving chip is used for signal control of the row tube, is provided with three data input pins including DIN, CLK and LAT and is used for being connected with an external LED control system, and is also provided with an OE pin, a DOUT pin, a plurality of OUT output pins, and the OE pin is independently grounded;

the number of the driving chips used for controlling the LED lamps is at least one, and the chips with the same type as the driving chips used for controlling the signal of the row tube are selected;

the driving chip used for the control of the row tube signals and the driving chip used for the control of the LED lamps use the same group of LAT and CLK signals connected to the outside, and the DOUT pin of the driving chip used for the control of the row tube signals is connected with the DIN pin of the driving chip used for the control of the LED lamps;

and the OUT output pin of the driving chip used for controlling the row tube signal and the OUT output pin of the driving chip used for controlling the LED lamp are connected with the LED lamp through the MOSFET (metal-oxide-semiconductor field effect transistor) control.

Preferably, when the number of the driving chips used for controlling the LED lamps is more than one, the number of the MOSFET field effect transistors is a plurality, and the MOSFET field effect transistors are used for controlling the current passing through the LED lamps to be switched on or off, and each MOSFET field effect transistor can control 3 LED lamps; and OE pins of the driving chips used for controlling the LED lamps are connected in parallel.

Preferably, the model of the driving chip used for the control of the row tube signal and the driving chip used for the control of the LED lamp is ST 62726.

Preferably, the number of the driving chips used for controlling the LED lamps is 2, the OE pin of the driving chip used for controlling the row tube signal is grounded, the DOUT pin of the driving chip used for controlling the row tube signal is connected to the DIN pin of the first driving chip used for controlling the LED lamps, the DOUT pin of the first driving chip used for controlling the LED lamps is connected to the DIN pin of the second driving chip used for controlling the LED lamps, the two driving chips used for controlling the LED lamps and the driving chip used for controlling the row tube signal share a set of CLK and LAT input signals, the driving chip used for controlling the row tube signal adopts four OUT output pins to be connected to the MOSFET field effect transistor, and sixteen-channel output of the first driving chip used for controlling the LED lamps and eight-channel output of the second driving chip used for controlling the LED lamps are realized.

Preferably, the CLK pin provides a clock signal to the shift pulses of the shift register, each pulse causing data to be shifted in or out by one bit.

Preferably, the DIN pin is adapted to receive a data signal to provide data required for displaying an image, and is adapted to transmit the data to any one of the display points in coordination with a clock signal.

Preferably, the LAT pin is a latch data pin.

As described above, the technical scheme of the invention saves half of the wiring space. The control signal of the driving chip is only 4, the 4 signals are 4 signals necessary for lighting the LED, namely, the space similar to that of the static screen body of the LED is only needed to be designed when the LED scanning screen body is designed. Borrow this can accomplish a lot of product designs very high to the space restriction, for example lamp strip LED screen or transparent LED screen, lamp strip thickness and width can greatly reduced, have very big improvement effect on whole outward appearance and the transparency to whole product.

The materials required to be prepared in the production process are reduced, and the warehouse preparation cost is reduced. Since the driving chip is used as a decoding chip.

The cost is reduced. The PCB board layers required to complete the entire product can be reduced.

The product performance is improved. When a product is designed, the control circuits need to be distributed well, and a lot of wiring performances need to be abandoned, for example, basic rules of electronic design such as line width length and the like, and electronic performance margins may need to be reduced under the condition of limited cost or space.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic circuit structure diagram according to embodiment 1 of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.

Embodiment 1, referring to fig. 1, this embodiment provides a control circuit of an LED scanning display screen, including: an LED lamp configured as a control object of the control circuit;

the driving chip used for the control of the row tube signals adopts ST62726, and is provided with three data input pins of DIN, CLK and LAT, an OE pin, a DOUT pin and 16 OUT output pins; the CLK pin supplies a clock signal to the shift pulses of the shift register, each pulse causing data to be shifted in or out by one bit, the DIN pin receives the data signal and supplies the data required for displaying an image, which is transferred to any one of the display points in coordination with the clock signal, and the LAT pin is a latch data pin.

The two driving chips used for controlling the LED lamps are the same as the driving chip used for controlling the signal of the row tube in model ST 62726;

the number of the MOSFET field effect transistors is 8, the MOSFET field effect transistors are used for controlling the current passing through the LED lamps to be switched on or switched off, and each MOSFET field effect transistor can control 3 LED lamps;

the driving chip used for the control of the row tube signals is connected with the CLK pin and the LAT pin of the driving chip used for the control of the LED lamp in parallel, so that the three chips share one group of CLK and LAT signals;

an OE pin of the driving chip used for controlling the row tube signal is independently grounded, and an OE pin of the driving chip used for controlling the LED lamp is connected in parallel;

the DOUT pin of the driving chip used for the control of the row tube signals is connected with the DIN pin of the first driving chip used for the control of the LED lamps, the DOUT pin of the first driving chip used for the control of the LED lamps is connected with the DIN pin of the second driving chip used for the control of the LED lamps, the two driving chips used for the control of the LED lamps and the driving chip used for the control of the row tube signals share one group of CLK and LAT input signals, the driving chip used for the control of the row tube signals adopts four OUT output pins to be connected with the MOSFET field effect transistor, and sixteen-channel output of the first driving chip used for the control of the LED lamps and eight-channel output of the second driving chip used for the control of.

Of course, as another embodiment of the present invention, when there is one driving chip for controlling the LED lamp, the DOUT pin of the driving chip for controlling the driving signal of the driving lamp is connected to the DIN pin of the driving chip for controlling the LED lamp;

when the number of the driving chips used for controlling the LED lamp is more than one, the DOUT pin of the driving chip used for controlling the kinescope signal is connected with the DIN pin of the first driving chip used for controlling the LED lamp, the DOUT pin of the first driving chip used for controlling the LED lamp is connected with the DIN pin of the second driving chip used for controlling the LED lamp, and the like; or the DIN pin of the driving chip used for the control of the row tube signal is connected with a DOUT pin of the driving chip used for the control of the LED lamp, and the DOUT pin of the driving chip used for the control of the row tube signal is connected with the DIN pin of the next driving chip used for the control of the LED lamp;

when one driving chip is used for controlling the LED lamp, the OUT output pin of the driving chip used for controlling the signal of the row tube is connected with the OUT pin of the driving chip used for controlling the LED lamp, and the connecting circuit is connected with the LED lamp and is controlled by the MOSFET field effect transistor;

when the number of the driving chips used for controlling the LED lamps is more than one, the OUT output pin of the driving chip used for controlling the row tube signals is connected with the OUT pins of the driving chips used for controlling the LED lamps in a parallel mode, and the LED lamps are connected to the connecting circuit and controlled through the MOSFET field effect transistors.

By adopting the technical scheme of the invention, the wiring space is saved by half. The control signal of the driving chip is only 4, the 4 signals are 4 signals necessary for lighting the LED, namely, the space similar to that of the static screen body of the LED is only needed to be designed when the LED scanning screen body is designed. Borrow this can accomplish a lot of product designs very high to the space restriction, for example lamp strip LED screen or transparent LED screen, lamp strip thickness and width can greatly reduced, have very big improvement effect on whole outward appearance and the transparency to whole product.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. It will be apparent to those skilled in the art that a number of simple derivations or substitutions can be made without departing from the inventive concept.

Claims

The control circuit of the LED scanning display screen is characterized by comprising:

an LED lamp configured as a control object of the control circuit;

the driving chip is used for signal control of the row tube, is provided with three data input pins including DIN, CLK and LAT and is used for being connected with an external LED control system, and is also provided with an OE pin, a DOUT pin, a plurality of OUT output pins, and the OE pin is independently grounded;

the number of the driving chips used for controlling the LED lamps is at least one, and the chips with the same type as the driving chips used for controlling the signal of the row tube are selected;

the driving chip used for the control of the row tube signals and the driving chip used for the control of the LED lamps use the same group of LAT and CLK signals connected to the outside, and the DOUT pin of the driving chip used for the control of the row tube signals is connected with the DIN pin of the driving chip used for the control of the LED lamps;

when the number of the driving chips used for controlling the LED lamp is more than one, the DOUT pin of the driving chip used for controlling the kinescope signal is connected with the DIN pin of the first driving chip used for controlling the LED lamp, the DOUT pin of the first driving chip used for controlling the LED lamp is connected with the DIN pin of the second driving chip used for controlling the LED lamp, and the like;

and the OUT output pin of the driving chip used for controlling the row tube signal and the OUT output pin of the driving chip used for controlling the LED lamp are connected with the LED lamp through the MOSFET (metal-oxide-semiconductor field effect transistor) control.
2. The control circuit of the LED scanning display screen according to claim 1, wherein when the number of the driving chips used for controlling the LED lamps is more than one, the number of the MOSFET field effect transistors is a plurality, the MOSFET field effect transistors are used for controlling the current passing through the LED lamps to be switched on or off, and each MOSFET field effect transistor can control 3 LED lamps; and OE pins of the driving chips used for controlling the LED lamps are connected in parallel.
3. The control circuit of the LED scanning display screen according to claim 1 or 2, wherein the model of the driving chip used for the control of the row tube signal and the driving chip used for the control of the LED lamp is ST 62726.
4. Control circuit of an LED scanning display screen according to any one of claims 1-2, the LED driving circuit is characterized in that the number of the driving chips used for controlling the LED lamps is 2, an OE pin of the driving chip used for controlling the row tube signal is grounded, the DOUT pin of the driving chip used for the control of the row tube signal is connected with the first DIN pin of the driving chip used for the control of the LED lamp, the DOUT pin of the first driving chip used for the control of the LED lamp is connected with the second DIN pin of the driving chip used for the control of the LED lamp, the two driving chips used for the control of the LED lamp and the driving chip used for the control of the row tube signal share a group of CLK and LAT input signals, the driving chip used for the signal control of the row tube adopts four OUT output pins to be connected with the MOSFET, so that sixteen-channel output of the first driving chip used for controlling the LED lamp and eight-channel output of the second driving chip used for controlling the LED lamp are realized.
5. The control circuit of an LED scanning display screen according to any one of claims 1-2, characterized in that the CLK pin provides a clock signal to the shift pulses of the shift register, each pulse causing data to shift in or out by one bit.
6. A control circuit for an LED scanning display screen according to any one of claims 1-2, characterized in that the DIN pin is arranged to receive data signals for providing data required for displaying an image, which data is transferred to any one of the display points in coordination with a clock signal.
7. The control circuit of LED scanning display screen according to any of claims 1-2, characterized in that said LAT pin is a latch data pin.