CN201853466U

CN201853466U - LED (light-emitting diode) display screen control system

Info

Publication number: CN201853466U
Application number: CN2010205648111U
Authority: CN
Inventors: 黄冬来
Original assignee: 黄冬来
Current assignee: Fujian Bowei Intelligent Technology Co., Ltd.
Priority date: 2010-10-14
Filing date: 2010-10-14
Publication date: 2011-06-01
Anticipated expiration: 2020-10-14

Abstract

The utility model relates to an LED (light-emitting diode) display screen control system based on single chip communication, which comprises a single chip control system, a line drive circuit, a plurality of row drive circuits and a plurality of 16*16 dot matrix display screens. The single chip control system adopts an MSC-51 (mobile switching center-51) single chip wafer, the serial port of the single chip control system is connected with the line drive circuit to display data, the port P1 (4 bits lower) of the single chip control system is connected with the row drive circuits to transmit row selection signals, the ports 1.5-1.7 of the single chip control system are used for transmitting control signals, and the ports P0 and P2 of the single chip control system are suspended and can be connected with a ROM (read only memory) and a RAM (random access memory) of an extended system if necessary. The control system adopts the single chip MSC-51 as a control core, four 16*16 dot matrix LEDs are adopted for text display, each row of words can be arranged in a rolling way, row by row or in other ways during text display, and the brightness of each point of the display screens is uniform, sufficient and stable, and each point of the display screens is clear with no interference. The system has a high transmission speed, a low production cost and a good safety performance.

Description

A kind of LED display control system

Technical field

The utility model relates to field of video displaying, relates in particular to a kind of LED display control system based on single chip communication.

Background technology

The LED dot matrix display screen is as a kind of emerging display device, be to form by a plurality of independently LED LED package, the LED dot matrix display screen can display digit or symbol, be commonly used to demonstration time, speed, system state etc., single-chip microcomputer is the road of the independent development of embedded system, to the key factor of MCU stage development, seek the maximization of application system on chip exactly and solve; Therefore, the development of special-purpose single-chip microcomputer has formed SoCization trend naturally.Along with the microelectronics skill this, the development of IC design, eda tool, have bigger development based on the scm application system design of SoC.Therefore, the understanding to single-chip microcomputer can extend to the monolithic application system from one chip microcomputer, single chip microcontroller.

Along with LED display is shown up prominently gradually in the advertisement media field, its control system also like rain the back spring bamboo, emerges in an endless stream, because its control system all is based on the embedded microprocessor exploitation, so single-chip microcomputer also occupies a tiny space therein.But, because LED display control is complicated, particularly for showing special-effect, as mobile, the covering neon effect that circulates, requirement processor calculating speed is fast, execution efficient height, so a lot of control card manufacturers adopt high-end embedded system to design, can improve data processing speed to a certain extent though do like this, but can not satisfy all display effect requirements fully, and exploitation and cost of products also can be multiplied thereupon, even phenomenons such as shake, flicker, ghost image may occur because its design is improper when showing.

The utility model content

The purpose of this utility model provides the LED display control system based on single chip communication that a kind of transmission speed is fast, production cost is low, security performance is good.

The technical scheme that the utility model adopted is such: a kind of LED display control system, comprise single-chip computer control system, column drive circuit, horizontal drive circuit and 16 * 16 dot matrix display screens, described single-chip computer control system adopts the MSC-51 singlechip chip, the single-chip computer control system serial ports video data that links to each other with column drive circuit, low 4 of the P1 mouth of single-chip computer control system links to each other with line driver and to send the capable signal that selects, P1.5～P1.7 mouth is used for transmitting control signal, and P0 mouth and P2 mouth are unsettled.

Described column drive circuit adopts integrated circuit 74HC595, it has shift register and 8 output latches that one 8 bit string is gone into and gone out, 8 integrated circuit 74HC595 are carried out cascade, can a shared shift clock SCK and data latch signal RCK, the control of shift clock SCK and data latch signal RCK is separately independently.

Described horizontal drive circuit adopts 4-16 line code translator 74LS154, and its input is one 16 ary codes, and decoding is output as the low state sweep signal the G1 of 74LS154 and G2 pin ground connection.

Described 16 * 16 dot matrix display screens adopt dynamic display types to show, each row has a horizontal drive circuit, the shared horizontal drive circuit of column drive circuit of the same name of each row, the infall of horizontal drive circuit and column drive circuit respectively has a LED, the anode of LED links to each other with horizontal drive circuit, and negative electrode links to each other with column drive circuit.

By adopting the aforementioned techniques scheme, the beneficial effects of the utility model are: this LED display control system adopts single-chip microcomputer MSC-51 to be the control core, some matrix LED by four 16x16 carries out the literal demonstration, literal shows that having every composing has rolling and wait display mode by row, the brightness of display screen each point is even, sufficient, stable, clear nothing is crosstalked, and system transmissions speed is fast, production cost is low, security performance is good.

Description of drawings

Fig. 1 is the system construction drawing of the utility model embodiment;

Fig. 2 is 4 dot matrix display screen circuit theory diagrams of the utility model embodiment;

Display driving software process flow diagram when Fig. 3 is the utility model embodiment.

Embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, a kind of LED display control system comprises single-chip computer control system 1, column drive circuit 2, horizontal drive circuit 3 and 16 * 16 dot matrix display screens 4, and described single-chip computer control system 1 adopts the MSC-51 singlechip chip.

As shown in Figure 2, single-chip computer control system U1 serial ports is connected 74LS245 with extended chip 74LS245 B1-B4 connects eight column drive circuit U7-U14, be used for video data, the B5-B8 of extended chip 74LS245D connects horizontal drive circuit U2 and links to each other, and sends row and selects signal.

Described column drive circuit U7-U14 adopts integrated circuit 74HC595, it has shift register and 8 output latches that one 8 bit string is gone into and gone out, 8 integrated circuit 74HC595 are carried out cascade, can a shared shift clock SCK and data latch signal RCK, the control of shift clock SCK and data latch signal RCK is separately independently, when showing this raw column data, transmit the column data of next line, reach the purpose of overlapping processing.8 74HC595 are carried out cascade, can a shared shift clock SCK and data latch signal RCK.Like this, after first row needs data presented through 8x8=64 SCK clock, just can all move into it among 74HC595, this moment also will produce a data latch signal RCK with data latching in 74HC595, and under the effect of enable signal G, make to seal in data parallel output, amplify or cut-off state thereby the field driving tube corresponding with each carry-out bit is in; Produce signal by the line scanning control circuit simultaneously and make the first line scanning tube conducting, the anode that is equivalent to the first row LED all connects height, and obviously, the latch signal among the 74HC595 is just depended in the light on and off of the first row LED pipe; In addition, when the first row LED pipe is lighted, moving into second row again in 74HC595 needs data presented, subsequently it is latched, and the while is closed first line scanning tube by the line scanning control circuit and connects second and go, the second row LED pipe is lighted, by that analogy, when returning first later, the 16 line scanning goes, like this, as long as sweep velocity is enough high, just can form a complete literal or image.

Described horizontal drive circuit U2 adopts 4-16 line code translator 74LS154, its input is one 16 ary codes, decoding is output as the low state sweep signal the G1 of 74LS154 and G2 pin ground connection, be input end with A, B, C, D four pin then, will form 16 kinds of different input states, be respectively 0000～1111, make every kind of state only control one tunnel output then, promptly have 16 tunnel outputs.If 64 of delegation all light, then the electric current by 4-16 line code translator 74LS154 will reach 640mA, and in fact, 4-16 line code translator 74LS154 does not provide enough ABSORPTION CURRENT and drives 64 LED simultaneously and light simultaneously, therefore, should between each road output terminal of 4-16 line code translator 74LS154 each row corresponding, current signal be amplified with a triode with the 16x64 matrix display, adopt triode 8550, when making a certain output pin of 4-16 line code translator 74LS154 be low level,, corresponding transistor emitter make the corresponding row of matrix display also be high level thereby being high level.

Described 16 * 16 dot matrix display screens adopt dynamic display types to show, each row has a horizontal drive circuit, the shared horizontal drive circuit of column drive circuit of the same name of each row, show the method that adopts overlapping processing, when showing each column data of one's own profession, transmit the next column data, constitute one 16 * 16 dot matrix display screen by four 8 * 8 dot matrix, the infall of row and column has a LED, is made of 256 LED altogether, if the anode of LED links to each other with row, and negative electrode links to each other with row, as long as the row of giving this LED correspondence with high level, is listed as with low level, so Dui Ying LED is just luminous so.

As shown in Figure 3, display driving software is responsible for sending video data to the screen body, and responsible line scan signals and other control signals of producing, cooperate the scanning demonstration work of finishing LED display, the display driver program is realized by timer T0 interrupt routine, system application is finished work such as system environments setting (initialization), display effect processing, is realized by master routine.

More than show and described ultimate principle of the present utility model and principal character and advantage thereof; the technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the explanation just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. LED display control system, it is characterized in that: comprise single-chip computer control system (1), column drive circuit (2), horizontal drive circuit (3) and 16 * 16 dot matrix display screens (4), described single-chip computer control system (1) adopts the MSC-51 singlechip chip, single-chip computer control system (1) the serial ports video data that links to each other with column drive circuit (2), low 4 of the P1 mouth of single-chip computer control system (1) links to each other with line driver (3) and to send the capable signal that selects, P1.5～P1.7 mouth is used for transmitting control signal, and P0 mouth and P2 mouth are unsettled.

2. a kind of LED display control system according to claim 1, it is characterized in that: described column drive circuit (2) adopts integrated circuit 74HC595, it has shift register and 8 output latches that one 8 bit string is gone into and gone out, 8 integrated circuit 74HC595 are carried out cascade, can a shared shift clock SCK and data latch signal RCK, the control of shift clock SCK and data latch signal RCK is separately independently.

3. a kind of LED display control system according to claim 1, it is characterized in that: described horizontal drive circuit (3) adopts 4-16 line code translator 74LS154, its input is one 16 ary codes, and decoding is output as the low state sweep signal the G1 of 74LS154 and G2 pin ground connection.

4. a kind of LED display control system according to claim 1, it is characterized in that: described 16 * 16 dot matrix display screens (4) adopt dynamic display types to show, each row has a horizontal drive circuit (3), the shared horizontal drive circuit of column drive circuit of the same name (2) (3) of each row, the infall of horizontal drive circuit (3) and column drive circuit (2) respectively has a LED, the anode of LED links to each other with horizontal drive circuit (3), and negative electrode links to each other with column drive circuit (2).