CN213691400U - LED multi-picture arbitrary switching controller - Google Patents

Abstract

The utility model relates to a LED shows technical field, discloses a display screen switches stable LED multipicture and switches controller wantonly, possesses: the communication end of the singlechip is connected with the upper computer through RS485 and is used for receiving a switching signal output by the upper computer; the input end of the shift register circuit is connected with the data output end of the singlechip, and the shift register circuit is used for storing display data; the signal input end of the column driving circuit is connected with a signal output end of the singlechip and is used for receiving a switching signal; a signal input end of the line driving circuit is connected with the other signal output end of the singlechip and is used for receiving a switching signal; the signal output ends of the column driving circuit and the row driving circuit are respectively connected with the LED display screen; when the singlechip outputs the switching signal, the column driving circuit and the row driving circuit control the display picture of the LED display screen according to the input switching signal.

Description

LED multi-picture arbitrary switching controller

Technical Field

The utility model relates to a LED shows technical field, more specifically says, relates to a LED multipicture is switching controller wantonly.

Background

The LED display screen is a large display screen system integrating a microelectronic technology, a computer technology and an information processing technology, and the display and the realization of dynamic effects (mainly the rolling of display contents) mainly depend on hardware scanning driving. The method can control the display content in real time, thereby realizing various dynamic display effects such as flashing, scrolling, typing and the like. At present, the dynamic display of the LED display screen usually adopts hardware scanning driving, and the implementation of dynamic display switching usually changes the interrupt time of a timer, and when the display speed is slow, the refresh rate of the whole screen is easily reduced, which causes the display picture of the LED display screen to flicker.

Therefore, how to improve the stability of the LED display screen during dynamic display switching is a technical problem that needs to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, realize that the dynamic display switches to the above-mentioned of prior art is the interrupt time who changes the timer usually, when showing that speed is very slow, easily make the refresh rate of whole screen reduce, the defect that the scintillation appears in the display screen that leads to the LED display screen provides the arbitrary switching controller of the stable LED multipicture of display screen switching.

The utility model provides a technical scheme that its technical problem adopted is: an LED multi-screen arbitrary switching controller is constructed, comprising:

the communication end of the singlechip is connected with the upper computer through RS485 and is used for receiving the switching signal output by the upper computer;

the input end of the shift register circuit is connected with the data output end of the singlechip, and the shift register circuit is used for storing display data;

the signal input end of the column driving circuit is connected with a signal output end of the singlechip and is used for receiving the switching signal;

a signal input end of the line driving circuit is connected with the other signal output end of the singlechip and is used for receiving the switching signal;

the signal output ends of the column driving circuit and the row driving circuit are respectively connected with an LED display screen;

when the singlechip outputs the switching signal, the column driving circuit and the row driving circuit control the display picture of the LED display screen according to the input switching signal.

In some embodiments, the system further comprises a data storage, and an input end of the data storage is connected with an output end of the single chip microcomputer.

In some embodiments, the column driver circuit comprises a first bit shift storage bus register and a first driver;

the serial data input end of the first bit shift storage bus register is connected with a signal output end of the singlechip,

and the signal input end of the first driver is respectively connected with the signal output end of the first bit shift storage bus register.

In some embodiments, the row driver circuit includes a second bit-shift storage bus register and a second driver;

the serial clock end of the second bit shift storage bus register is connected with the other signal output end of the singlechip,

and the signal input end of the second driver is respectively connected with the signal output end of the second bit shift storage bus register.

In some embodiments, the shift register circuit comprises a first shift register circuit and a second shift register circuit,

the data input end of the first shift register circuit is connected with the third signal output end of the single chip microcomputer;

and the data input end of the second shift register circuit is connected with the fourth signal output end of the singlechip.

In the LED multi-frame random switching controller of the present invention, the controller comprises a single chip for receiving the switching signal outputted from the upper computer, a shift register circuit, a row driving circuit and a row driving circuit, wherein the signal output terminals of the row driving circuit and the row driving circuit are respectively connected to the LED display screen; when the singlechip outputs the switching signal, the column driving circuit and the row driving circuit control the display picture of the LED display screen according to the input switching signal. Compared with the prior art, switching signals are respectively input to the column driving circuit and the row driving circuit through the single chip microcomputer to control the LED display screen to switch display pictures, the problems that the dynamic display of the LED display screen is generally driven by hardware scanning, the interruption time of a timer is changed during switching, and when the display speed is slow, the refresh rate of the whole screen is easy to reduce, so that the display pictures of the LED display screen flicker are solved.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic circuit diagram of an embodiment of an LED multi-screen arbitrary switching controller according to the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, in the first embodiment of the LED multi-screen arbitrary switching controller of the present invention, the LED multi-screen arbitrary switching controller 100 includes a single chip U101, a column driving circuit 101, a row driving circuit 102, shift register circuits (103, 104), and a data storage U102.

The communication end of the singlechip U101 is connected with an upper computer (corresponding to a PC) through RS232/RS485, and is used for receiving switching signals output by the upper computer and then respectively outputting the switching signals to the column driving circuit 101 and the row driving circuit 102.

Furthermore, the input ends of the shift register circuits (103, 104) are connected with the data output end of the singlechip U101, and the shift register circuits (103, 104) are used for storing display data.

Specifically, a signal input end of the column driving circuit 101 is connected to a signal output end of the single chip U101, and is configured to receive the switching signal.

The signal input end of the row driving circuit 102 is connected with the other signal output end of the singlechip U101 and used for receiving a switching signal; the signal output ends of the column driving circuit 101 and the row driving circuit 102 are respectively connected to the LED display screen.

When the singlechip U101 outputs a switching signal, the column driving circuit 101 and the row driving circuit 102 control a display screen of the LED display screen according to the input switching signal.

Specifically, during work, 20 bytes of dot matrix data needing to be displayed in a first row are taken out from the buffer area by the singlechip U101, and then are sequentially and serially input to the column shift register circuits (103 and 104) in bit by bit through the ports of the column dot matrix data input end P1.2, wherein the data input sequence is opposite to the sequence of display contents; then setting the row lattice strobe end P1.3 to 1, namely setting D of the row shift register circuits (103, 104) to high level, STR enables (OE pin of the shift register is connected with +5V level), thereby enabling data in the column shift register circuits to be simultaneously output in parallel to strobe the row.

In the PC-controlled multi-singlechip U101 display system, the main functions realized by the PC comprise selection of a singlechip U101 display subsystem, display mode selection (including static state, flashing, scrolling, typing and the like), scrolling direction selection (including up-down scrolling and left-right scrolling), dynamic display speed adjustment (namely character flashing frequency, scrolling speed, typing display speed and the like), display picture switching, display preview and the like.

When the LED display screen needs to be subjected to picture switching, switching signals sent by a PC (personal computer) are received through an RS232/RS485 serial port, and then the singlechip U101 is controlled to perform line scanning (timing scanning), so that the singlechip U101 interrupts and displays one line at each time, the timing interruption time between the column driving circuit 101 and the line driving circuit 102 is about 1.25ms, and the problem that the display picture of the LED display screen flickers due to the fact that the interruption time of a timer is long when the display speed is very slow is solved.

In some embodiments, in order to improve the performance of the circuit, a data storage U102 may be disposed in the controller, wherein an input end (corresponding to the CE end) of the data storage U102 is connected to an output end (corresponding to the P2.5 end) of the single-chip microcomputer U101, and the data storage U102 is configured to store data scanned and switched by the single-chip microcomputer U101 each time.

In some embodiments, in order to improve the stability of the operation of the LED display panel, a first bit shift storage bus register U4A and a first driver U5A may be disposed in the driving circuit 101; the serial data input end (corresponding to the end D) of the first bit shift storage bus register U4A is connected to a signal output end (corresponding to the end P1.2) of the single chip microcomputer U101, and is configured to receive a switching signal output by the single chip microcomputer U101.

The signal input end (corresponding to the end 1B … 8B) of the first driver U5A is respectively connected to the signal output end (corresponding to the end Q1 … Q8) of the first bit shift storage bus register U4A, and the signal output end (corresponding to the end 1C … 8C) of the first driver U5A is respectively electrically connected to the LED display screen.

In some embodiments, in order to improve the stability of the LED display panel, a second bit shift storage bus register U4B and a second driver U5B may be disposed in the row driving circuit 102, wherein a serial clock terminal (corresponding to the CLK terminal) of the second bit shift storage bus register U4B is connected to another signal output terminal (corresponding to the P1.4 terminal) of the mcu U101 for receiving the switching signal output by the mcu U101.

The signal input end (corresponding to the end 1B … 8B) of the second driver U5B is connected to the signal output end (corresponding to the end Q1 … Q8) of the second bit shift storage bus register U4B, and the signal output end (corresponding to the end 1C … 8C) of the second driver U5B is electrically connected to the LED display screen.

In some embodiments, the shift register circuit further includes a first shift register circuit 103 and a second shift register circuit 104, wherein a data input end (corresponding to the D end) of the first shift register circuit 103 is connected to a third signal output end (corresponding to the P1.6 end) of the single chip U101; and a data input end (corresponding to a CLK end) of the second shift register circuit is connected with a fourth signal output end (corresponding to a P1.5 end) of the singlechip U101.

The specific working principle is as follows: generally, a PC needs to perform master-slave communication with a plurality of single-chip microcomputer U101 systems, so that the single-chip microcomputer U101 can adopt a serial port working mode, i.e. an 11-bit asynchronous receiving/transmitting mode, effective data of the mode is 9 bits, wherein the 9 th bit is a flag bit of address/data information, and the function of the mode is to enable a slave to judge whether transmitted data is an address or not, thereby realizing multi-computer operation.

Firstly, sending a communication start mark, then sending a system address of a singlechip U101 needing to be operated, then sending a display work command word, wherein the command comprises 2 bytes, the former byte is used for setting a display mode and a rolling direction, the latter byte is used for setting a display speed, then downwards transmitting dot matrix data of display contents, and finally checking the data.

It should be noted that when the display content of the LED display screen needs to be switched, in order to avoid the messy codes appearing on the LED display screen when the serial interrupt of the single chip microcomputer U101 receives data, the display screen should be temporarily not displayed (in a "black screen" state) until the data reception is complete, and the display is displayed again when the serial interrupt processing is finished.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (5)

1. An LED multi-screen arbitrary switching controller, comprising:

the communication end of the singlechip is connected with the upper computer through RS485 and is used for receiving the switching signal output by the upper computer;

the input end of the shift register circuit is connected with the data output end of the singlechip, and the shift register circuit is used for storing display data;

the signal input end of the column driving circuit is connected with a signal output end of the singlechip and is used for receiving the switching signal;

a signal input end of the line driving circuit is connected with the other signal output end of the singlechip and is used for receiving the switching signal;

the signal output ends of the column driving circuit and the row driving circuit are respectively connected with an LED display screen;

when the singlechip outputs the switching signal, the column driving circuit and the row driving circuit control the display picture of the LED display screen according to the input switching signal.

2. The LED multipicture arbitrary switching controller according to claim 1,

the system also comprises a data memory, wherein one input end of the data memory is connected with one output end of the singlechip.

3. The LED multipicture arbitrary switching controller according to claim 1,

the column driving circuit comprises a first bit shift storage bus register and a first driver;

the serial data input end of the first bit shift storage bus register is connected with a signal output end of the singlechip,

and the signal input end of the first driver is respectively connected with the signal output end of the first bit shift storage bus register.

4. The LED multipicture arbitrary switching controller according to claim 1,

the row driving circuit comprises a second bit shift storage bus register and a second driver;

the serial clock end of the second bit shift storage bus register is connected with the other signal output end of the singlechip,

and the signal input end of the second driver is respectively connected with the signal output end of the second bit shift storage bus register.

5. The LED multipicture arbitrary switching controller according to claim 1,

the shift register circuit comprises a first shift register circuit and a second shift register circuit,

the data input end of the first shift register circuit is connected with the third signal output end of the single chip microcomputer;

and the data input end of the second shift register circuit is connected with the fourth signal output end of the singlechip.

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