CN203588646U

CN203588646U - LED unit board

Info

Publication number: CN203588646U
Application number: CN201320734591.6U
Authority: CN
Inventors: 李以华
Original assignee: Individual
Current assignee: Strait Cailiang Zhangzhou Photoelectric Co ltd
Priority date: 2013-11-20
Filing date: 2013-11-20
Publication date: 2014-05-07
Anticipated expiration: 2023-11-20

Abstract

The utility model discloses an LED unit board, which comprises an input interface circuit, a column driving circuit, a row driving circuit, a lamp tube dot matrix circuit and an output interface circuit, wherein the input interface circuit amplifies, strengthens and shapes input signals through a 74HC245 chip, and the output drives the identical-level circuit and a lower-level circuit to operate. In the row driving circuit, row signals A, B, C, D output 16 rows of scanning driving signals through a 4-16 wire decoder formed by two 74HC245 chips U1, U2. In the column driving circuit, red, green and blue signals R, G, B, serial data signals, latch signals and serial clock signals generate driving signals through a constant-current chip. The column driving circuit comprises the constant-current chip.

Description

A kind of LED cell board

Technical field

The utility model relates to LED display technical field, is specifically related to a kind of LED cell board.

Background technology

Current LED cell board is progressively to high definition and larger size development; High definition is relative contradiction with larger size in design, and it needs the circuit structure of reasonably optimizing more; The row driver element of existing LED cell board and row driver element can not be worked by LED corresponding to high-quality driving, cause existing large-sized LED cell board sharpness further to promote.

Summary of the invention

Technical problem to be solved in the utility model is, for above-mentioned deficiency of the prior art, to provide a kind of LED cell board, and it has more rational circuit structure, can realize the size that LED cell board is larger, has display effect more clearly simultaneously.

The utility model solves the technical scheme that its technical matters adopts: a kind of LED cell board, and its cell board circuit includes input interface circuit, column drive circuit, horizontal drive circuit, fluorescent tube dot matrix circuit and output interface circuit;

Above-mentioned input interface circuit by 74HC245 chip by input signal amplify, after reinforcement and shaping, output drives the corresponding levels and subordinate's circuit working; Wherein a-signal, B signal, C signal and D signal are horizontal-drive signal, and OE signal, CLK clock signal, LE clock, R data, G data, B data are row control signal; The OE signal of subordinate's lamp plate, CLK clock signal, LE clock are directly carried by 74HC245 chip at the corresponding levels;

In above line driving circuit, A, B, C, tetra-row signals of D are exported 16 line scannings by 4 line～16 line code translators of two 74HC138 chip U1, U2 compositions and are driven signals, and the P raceway groove mos pipe in 4953 provides driving signal to amplify, and meets driving force;

In above-mentioned column drive circuit, R, G, B R-G-B signals and serial data signal, latch signal, serial clock signal, by constant current chip, produce row and drive signal;

Above-mentioned constant current chip, its pin and pin function thereof are: VDD:IC power supply; GND:IC ground end; CLK: clock signal, coordinates data to write; SDI: luma data input, go here and there into and go out; SDO: luma data output, is cascaded to next IC; LE (LAT): luma data writes control, writes during high level; OE: passage output enable control; R-EXT: the output current of setting passage by outer meeting resistance; OUT0-OUT15: chip constant current port.

Further: in above-mentioned 74HC245 chip: signal is by 8 groups of passage turnover, and its access place at each LED module signal arranges.

Further: above-mentioned 74HC138 chip is 3-8 code translator, exports line scan signals on scan screen, is connected to mos tube grid.

Further: above-mentioned P raceway groove mos pipe, 4953 switching tubes, row control tube, Continuity signal is controlled by 74HC138, and each 4953 have two P raceway groove mos pipes.

Further: the operating voltage of cell board circuit described above is DC5V.

Further: above-mentioned 4953 chips are row signal controlling pipe, and constant current chip is column signal control tube.

Further: above-mentioned a-signal, B signal, C signal and D signal are line scan signals, by the control of 74H138 code translator, on scan screen, output row selects signal.

Further: in above line driving circuit, by 16 output pins of each 8 4953 chips of lamp plate left and right two parts, drive respectively 16 row LED to work.

Further: in above-mentioned constant current chip, current path is: VCC → metal-oxide-semiconductor → LED lamp → constant current port OUT, electric current regulates by R-EXT.

Further: said units plate circuit arrangement is on 64 × 32 dot matrix pcb boards; Described LED cell board is of a size of 384 × 192mm.

The utility model compared with prior art has the following advantages:

The utility model LED cell board, it comprehensively realizes the circuit control of LED cell board by input interface circuit, column drive circuit, horizontal drive circuit, fluorescent tube dot matrix circuit and output interface circuit, input interface circuit can provide the input signal of reliable and feature richness, horizontal drive circuit and column drive circuit are controlled separately by code translator and constant current chip respectively, finally realize high-quality signal output.

Accompanying drawing explanation

Fig. 1 is the utility model circuit theory diagrams;

Fig. 2 is horizontal drive circuit fundamental diagram;

Fig. 3 is the structural representation of constant current chip.

Description of reference numerals:

1-gas mould body, 2-set collar, 3-sprayed coating, 4-oxford, 5-LED module, 6-light power line, 7-LED power supply, 8-wire, 9-fan blower, 10-air intake cylinder, 11-static line.

Embodiment

Below in conjunction with drawings and Examples, the utility model embodiment is described:

Fig. 1, Fig. 2 and Fig. 3 show a kind of embodiment of the present utility model, as shown in the figure, the cell board circuit of the utility model LED cell board includes input interface circuit, column drive circuit, horizontal drive circuit, fluorescent tube dot matrix circuit and output interface circuit;

Major control signal of the present utility model is as follows:

Operating voltage: DC5V.

OE: enable control signal, by pulse width modulation controlled LED cell board brightness and gray scale.

CLK:CLK is shift clock signal, controls the displacement of constant current chip data in cell board.

LE (LAT): LE is latch clock signal, the data of constant current chip storage is outputed to OUT 0-OUT 15 and control LED lamp.

R signal: red fluorescent tube data.

G signal: green fluorescent tube data.

B signal: blue fluorescent tube data.

In the utility model, a-signal, B signal, C signal and D signal are line scan signals, and by the control of 74H138 code translator, on scan screen, output row selects signal;

The main chip that the utility model adopts has:

1, constant current chip (as shown in Figure 3), its pin function is as follows:

VDD:IC power supply;

GND:IC ground end;

CLK: clock signal, coordinates data to write;

SDI: luma data input, go here and there into and go out;

SDO: luma data output, is cascaded to next IC;

LE (LAT): luma data writes control, writes during high level;

OE: passage output enable control;

R-EXT: the output current of setting passage by outer meeting resistance;

OUT0-OUT15: chip constant current port, its current path is: VCC → metal-oxide-semiconductor → LED lamp → constant current port OUT, control this subcircuits constant in certain value, electric current regulates by R-EXT;

2,74HC245: signal, by 8 groups of passage turnover, plays signal amplification, reinforcement, shaping operation, uses when the access of each LED module signal.

3,74HC138:3-8 code translator is exported line scan signals on scan screen, is connected to mos tube grid.

4, P raceway groove mos pipe, 4953 switching tubes, row control tube, Continuity signal is controlled by 74HC138, and each 4953 have two P raceway groove mos pipes.

Input interface circuit major function of the present utility model be by 74HC245 chip by input signal amplify, after reinforcement and shaping, output drives the corresponding levels and subordinate's circuit working; Wherein a-signal, B signal, C signal and D signal are horizontal-drive signal, and OE signal, CLK clock signal, LE (LAT) clock, R data, G data, B data are row control signal; The OE signal of subordinate's lamp plate, CLK clock signal, LE (LAT) clock are directly carried by 74HC245 chip at the corresponding levels.

The principle of work of the utility model horizontal drive circuit is shown in Fig. 2: A, B, C, tetra-row signals of D are exported 16 line scannings by 4 line-16 line code translators of two 74HC138 chip U1, U2 compositions and driven signal, P raceway groove mos pipe in 4953 provides driving signal to amplify, and meets driving force.As shown in the figure, by 16 output pins of each 8 4953 chips of lamp plate left and right two parts, drive respectively 16 row LED to work.

In column drive circuit of the present utility model, R, G, B R-G-B signals and serial data signal, latch signal, serial clock signal, by constant current chip, produce row and drive signal.

In the utility model, 4953 chips are row signal controlling pipe, and constant current chip is column signal control tube.

By reference to the accompanying drawings the utility model preferred implementation is explained in detail above, but the utility model is not limited to above-mentioned embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make a variety of changes.

Do not depart from design of the present utility model and scope and can make many other changes and remodeling.Should be appreciated that the utility model is not limited to specific embodiment, scope of the present utility model is defined by the following claims.

Claims

1. a LED cell board, is characterized in that: its cell board circuit includes input interface circuit, column drive circuit, horizontal drive circuit, fluorescent tube dot matrix circuit and output interface circuit;

2. a kind of LED cell board as claimed in claim 1, is characterized in that: in described 74HC245 chip: signal is by 8 groups of passage turnover, and its access place at each LED module signal arranges.

3. a kind of LED cell board as claimed in claim 1, is characterized in that: described 74HC138 chip is 3-8 code translator, exports line scan signals on scan screen, is connected to mos tube grid.

4. a kind of LED cell board as claimed in claim 1, is characterized in that: P raceway groove mos pipe, and 4953 switching tubes, row control tube, Continuity signal is controlled by 74HC138, and each 4953 have two P raceway groove mos pipes.

5. a kind of LED cell board as claimed in claim 1, is characterized in that: described cell board circuit

Operating voltage be DC5V.

6. a kind of LED cell board as claimed in claim 1, is characterized in that: described 4953 chips are row signal controlling pipe, and constant current chip is column signal control tube.

7. a kind of LED cell board as claimed in claim 1, is characterized in that: described a-signal, B signal, C signal and D signal are line scan signals, and by the control of 74H138 code translator, on scan screen, output row selects signal.

8. a kind of LED cell board as claimed in claim 1, is characterized in that: in described horizontal drive circuit, by 16 output pins of each 8 4953 chips of lamp plate left and right two parts, drive respectively 16 row LED to work.

9. a kind of LED cell board as claimed in claim 1, is characterized in that: in described constant current chip, current path is: VCC → metal-oxide-semiconductor → LED lamp → constant current port OUT, electric current regulates by R-EXT.

10. a kind of LED cell board as claimed in claim 1, is characterized in that: described cell board circuit arrangement is on 64 × 32 dot matrix pcb boards; Described LED cell board is of a size of 384 × 192mm.