CN201773564U - IC protection module of LED display screen circuit - Google Patents
IC protection module of LED display screen circuit Download PDFInfo
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- CN201773564U CN201773564U CN201020507416XU CN201020507416U CN201773564U CN 201773564 U CN201773564 U CN 201773564U CN 201020507416X U CN201020507416X U CN 201020507416XU CN 201020507416 U CN201020507416 U CN 201020507416U CN 201773564 U CN201773564 U CN 201773564U
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Abstract
The utility model discloses an IC protection module of an LED display screen circuit, which comprises a data buffer 74HC245, a row coder 74HC138, a decoder 74HC595, an MOS tube 4953 and an LED connector. An input end of the data buffer 74HC245 is connected with a row decoded signal, a column decoded signal, a clock signal, a latch signal and a column enable signal, an output end of the data buffer 74HC245 is connected with the decoder 74HC595 and the row coder 74HC138, the row coder 74HC138 is connected with the MOS tube 4953, the MOS tube 4953 and the decoder 74HC595 are connected with the LED connector, and a single stabilize trigger 74HC123 is connected to a connecting circuit of the data buffer 74HC245 and the decoder 74HC138. The IC protection module can stabilize input voltage of the row coder 74HC138 by protecting the row decoded signal.
Description
Technical field
The utility model relates to the circuit protection module, especially LED display IC circuit protection module.
Background technology
The most of employing of LED dynamic scan display screen module on the society is the 74HC138 row decoding at present, and the 74HC04 function is six road band buffer inverter, by the enable signal (EN) of the anti-phase control of 74HC04 74HC138.74HC138 decoding is through 4953MOS pipe drive controlling LED line scanning.When not having input control signal, the good signal protection of circuit neither one burns out metal-oxide-semiconductor 4953 through regular meeting.The LED display operate as normal is caused very big influence.
The utility model content
The utility model proposes a kind of LED display IC circuit protection module at deficiency, can protect metal-oxide-semiconductor effectively, does not influence the operate as normal of LED display.
In order to realize above-mentioned utility model purpose, the utility model provides following technical scheme: a kind of LED display IC circuit protection module, comprise data buffer 74HC245, row sign indicating number device 74HC138, code translator 74HC595, metal-oxide-semiconductor 4953 and LED interface, be connected with row decoding signal, column decoding signal, clock signal, latch signal, row enable signal on the input end of described data buffer 74HC245, its output terminal is connected with code translator 74HC595, row sign indicating number device 74HC138; Described row sign indicating number device 74HC138 is connected with metal-oxide-semiconductor 4953, and described metal-oxide-semiconductor 4953 all is connected with the LED interface with code translator 74HC595;
On the connection line of data buffer 74HC245 and row sign indicating number device 74HC138, be connected with the monostable trigger 74HC123 that decides.
Preferably, described column decoding signal is connected to decoding pin first pin and the next stage output of row sign indicating number device 74HC138 behind data buffer 74HC245 buffer memory, describedly monostablely decides trigger 74HC123 and is connected on the above-mentioned signal line.
Preferably, described code translator 74HC595 is provided with several, and each other for being arranged in parallel.
Preferably, described row decoding signal is received the serial input pin of first code translator 74HC595, and the serial signal output pin of first code translator 74HC595 connects the serial input pin of next code translator 74HC595, so analogizes connection.
Preferably, the serial signal output pin of described code translator 74HC595 or remaining serial signal output pin are connected with the LED interface.
Compared with prior art, the utility model product utilization single-chip microcomputer or microcomputer mainly contain row decoding signal (R), column decoding signal (A, B), clock signal (SCLK), latch signal (SLK), row enable signal (OE) as the derived digital signal Control work.These signals through data buffer 74HC245 amplify and buffering after be connected to the 14th pin (serial input pin) that .R signal on each control chip is received first code translator 74HC595; SCLK, SLK meet each code translator 74HC595, and the 9th pin of first code translator 74HC595 (serial signal output pin) connects the 14th pin (serial input pin) of next code translator 74HC595, realizes the cascade of code translator 74HC595 like this.And the 2-9 pin of code translator 74HC595 goes out defeated pin as column signal, receives the row of control LED on the negative pole of each LED.The OE signal is connected to row sign indicating number device 74HC138 the 5th pin after data buffer 74HC245 buffering is amplified.A-signal one tunnel is connected to decoding pin first pin and the next stage output of row sign indicating number device 74HC138 behind data buffer 74HC245 buffer memory.A kind of monostalbe trigger 74HC123 the 2nd pin that is directly connected to.And the B signal through data buffer 74HC245 amplify and buffering after be connected on the three ends decoding input B end of row sign indicating number device 74HC138 and the row of level get-together of the subordinate pin B signal and after row sign indicating number device 74HC138 decoding, received on the G end of metal-oxide-semiconductor 4953, control the work of LED interface.
The monostable trigger effect is no matter trigger pip lasts long in the device of the utility model product, only fixedly keep given a period of time of peripheral capacitance-resistance and just recover to trigger preceding state, peripheral resistance capacitance determines the monostable time, is by edge-triggered because trigger, and rises or negative edge.Can trigger monostable difference again and be monostable after last time triggering recover to trigger before state and when trigger pip is arranged, can trigger monostable will the beginning to continue to keep the given monostable time of capacitance-resistance triggering the edge again, and monostable be to ignore trigger pip after upset.From the anti-initial conditions of protecting circuit.
Description of drawings
Fig. 1 is the connection diagram of the utility model product;
Fig. 2 is the circuit link block synoptic diagram of monostalbe trigger 74HC123.
Embodiment
Below in conjunction with specific embodiment the utility model is described in detail, the description of this part only is exemplary and explanatory, should any restriction not arranged to protection domain of the present utility model.
A kind of LED display IC circuit protection module as illustrated in fig. 1 and 2, comprise data buffer 74HC245, row sign indicating number device 74HC138, code translator 74HC595, metal-oxide-semiconductor 4953 and LED interface, be connected with row decoding signal, column decoding signal, clock signal, latch signal, row enable signal on the input end of described data buffer 74HC245, its output terminal is connected with code translator 74HC595, row sign indicating number device 74HC138; Described row sign indicating number device 74HC138 is connected with metal-oxide-semiconductor 4953, and described metal-oxide-semiconductor 4953 all is connected with the LED interface with code translator 74HC595; On the connection line of data buffer 74HC245 and row sign indicating number device 74HC138, be connected with the monostable trigger 74HC123 that decides.
Monostalbe trigger 74HC123, its RxCx (7,15) and Cx end (6,14) connect resistance and electric capacity regularly, i.e. and decision triggers the single pulse width that back Q end produces.Rbar (3,11) is the low level return-to-zero, is high level when not doing return-to-zero, and Abar (1,9) is that negative edge triggers input end, triggers with negative pulse by Abar, and the time spent does not keep high level; B (2,10) is that rising edge triggers input end, triggers with positive pulse by B, and the time spent does not put low; Q (5,13) and Qbar (4,12) export positive and negative timing monopulse respectively.
The protection circuit of circuit is by guard rows decoding a-signal; circuit-line is: input a-signal one tunnel is connected to row sign indicating number device 74HC138 after data buffer 74HC245 signal damping amplifies; one the tunnel is connected to the 2nd pin of monostalbe trigger 74HC123 after data buffer 74HC245 signal amplifies buffering, played the usefulness of doing of stable row sign indicating number device 74HC138 input and output voltage.
It below only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. LED display IC circuit protection module, it is characterized in that: comprise data buffer 74HC245, row sign indicating number device 74HC138, code translator 74HC595, metal-oxide-semiconductor 4953 and LED interface, be connected with row decoding signal, column decoding signal, clock signal, latch signal, row enable signal on the input end of described data buffer 74HC245, its output terminal is connected with code translator 74HC595, row sign indicating number device 74HC138; Described row sign indicating number device 74HC138 is connected with metal-oxide-semiconductor 4953, and described metal-oxide-semiconductor 4953 all is connected with the LED interface with code translator 74HC595;
On the connection line of data buffer 74HC245 and row sign indicating number device 74HC138, be connected with the monostable trigger 74HC123 that decides.
2. LED display IC circuit protection module as claimed in claim 1; it is characterized in that: described column decoding signal is connected to decoding pin first pin and the next stage output of row sign indicating number device 74HC138 behind data buffer 74HC245 buffer memory, describedly monostablely decides trigger 74HC123 and is connected on the above-mentioned signal line.
3. LED display IC circuit protection module as claimed in claim 1 is characterized in that: described code translator 74HC595 is provided with several, and each other for being arranged in parallel.
4. LED display IC circuit protection module as claimed in claim 3; it is characterized in that: described row decoding signal is received the serial input pin of first code translator 74HC595; the serial signal output pin of first code translator 74HC595 connects the serial input pin of next code translator 74HC595, so analogizes connection.
5. as claim 1 or 4 described LED display IC circuit protection modules, it is characterized in that: the serial signal output pin of described code translator 74HC595 or remaining serial signal output pin are connected with the LED interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020507416XU CN201773564U (en) | 2010-08-27 | 2010-08-27 | IC protection module of LED display screen circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020507416XU CN201773564U (en) | 2010-08-27 | 2010-08-27 | IC protection module of LED display screen circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201773564U true CN201773564U (en) | 2011-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201020507416XU Expired - Fee Related CN201773564U (en) | 2010-08-27 | 2010-08-27 | IC protection module of LED display screen circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113012633A (en) * | 2021-03-02 | 2021-06-22 | 深圳高鼎通信息技术有限公司 | Point-to-point correction system of common-sun LED display screen and implementation method thereof |
-
2010
- 2010-08-27 CN CN201020507416XU patent/CN201773564U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113012633A (en) * | 2021-03-02 | 2021-06-22 | 深圳高鼎通信息技术有限公司 | Point-to-point correction system of common-sun LED display screen and implementation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110323 Termination date: 20140827 |
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| EXPY | Termination of patent right or utility model |