CN203966516U - Scan type LED display screen holding circuit - Google Patents
Scan type LED display screen holding circuit Download PDFInfo
- Publication number
- CN203966516U CN203966516U CN201420344100.1U CN201420344100U CN203966516U CN 203966516 U CN203966516 U CN 203966516U CN 201420344100 U CN201420344100 U CN 201420344100U CN 203966516 U CN203966516 U CN 203966516U
- Authority
- CN
- China
- Prior art keywords
- integrated circuit
- port
- led display
- described integrated
- display screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000003990 capacitor Substances 0.000 claims description 3
- 206010038743 Restlessness Diseases 0.000 abstract description 6
- 230000001788 irregular Effects 0.000 abstract description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The utility model provides a kind of scan type LED display screen holding circuit; comprise: integrated circuit 74HC245, integrated circuit 74HC138, integrated circuit 74HC123 and translation interface HUB75; the A0 of described integrated circuit 74HC245, A1, A2 port are connected with C, A, the B port of described translation interface HUB75 respectively; the B0 of described integrated circuit 74HC245, B1, B2 port are connected with A0, A1, the A2 port of described integrated circuit 74HC138 respectively, described integrated circuit 74HC138's
port and described integrated circuit 74HC123's
port connects, and the A1 port of described integrated circuit 74HC245 is also connected with pull down resistor R2.The utility model is a kind ofly at power-on serving or input signal, can not make the bright scan type LED display screen holding circuit of the irregular unrest of LED display when abnormal.
Description
Technical field
The utility model relates to LED display circuit engineering field, relates in particular to a kind ofly at power-on serving or input signal, can not make the bright scan type LED display screen holding circuit of the irregular unrest of LED display when abnormal.
Background technology
In prior art as shown in Figure 2, when J1 no signal is inputted or can cause the a-signal of J1 to have height level to change while having human body undesired signal, make 2 pin in U1 have trigger pip, 4 pin just have output signal and make U2 misoperation, cause the irregular unrest of LED display bright.Do not have the effect of effective protection.
Utility model content
The purpose of this utility model is to provide and a kind ofly at power-on serving or input signal, can make the bright scan type LED display screen holding circuit of the irregular unrest of LED display when abnormal.
To achieve these goals; the technical scheme that the utility model provides is: a kind of scan type LED display screen holding circuit is provided; comprise: integrated circuit 74HC245, integrated circuit 74HC138, integrated circuit 74HC123 and translation interface HUB75; the A0 of described integrated circuit 74HC245, A1, A2 port are connected with C, A, the B port of described translation interface HUB75 respectively; the B0 of described integrated circuit 74HC245, B1, B2 port are connected with A0, A1, the A2 port of described integrated circuit 74HC138 respectively, described integrated circuit 74HC138's
port and described integrated circuit 74HC123's
port connects, and the A1 port of described integrated circuit 74HC245 is also connected with pull down resistor R2.
The resistance of described pull down resistor R2 is 10K.
The A3 of described integrated circuit 74HC245, A4, A5, A6, A7, the equal ground connection of GND port.
Between the VCC port of described integrated circuit 74HC123 and 1REXT/CEXT port, be in series with the resistance R 1 of a 100K, and between 1REXT/CEXT port and 1CEXT port, be in series with the capacitor C 1 of a 0.1 μ F.
Compared with prior art, in the utility model scan type LED display screen holding circuit, owing to being provided with described pull down resistor R2, low level cannot make described integrated circuit 74HC123 trigger final realization can misoperation at described integrated circuit 74HC138.When therefore, power-on serving or input signal are abnormal, can not make the bright scan type LED display screen holding circuit of the irregular unrest of LED display.
By following description also by reference to the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used for explaining embodiment of the present utility model.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of the utility model scan type LED display screen holding circuit.
Embodiment
With reference now to accompanying drawing, describe embodiment of the present utility model, in accompanying drawing, similarly element numbers represents similar element.As mentioned above, as shown in Figure 1, the utility model provides a kind of scan type LED display screen holding circuit, comprise: integrated circuit 74HC245, integrated circuit 74HC138, integrated circuit 74HC123, the manufacturer of above three integrated circuit is NXP, also comprise translation interface HUB75, the A0 of described integrated circuit 74HC245, A1, A2 port respectively with the C of described translation interface HUB75, A, B port connects, the B0 of described integrated circuit 74HC245, B1, B2 port respectively with the A0 of described integrated circuit 74HC138, A1, A2 port connects, described integrated circuit 74HC138's
port and described integrated circuit 74HC123's
port connects, and the A1 port of described integrated circuit 74HC245 is also connected with pull down resistor R2.
The resistance of described pull down resistor R2 is 10K.
The A3 of described integrated circuit 74HC245, A4, A5, A6, A7, the equal ground connection of GND port.
Between the VCC port of described integrated circuit 74HC123 and 1REXT/CEXT port, be in series with the resistance R 1 of a 100K, and between 1REXT/CEXT port and 1CEXT port, be in series with the capacitor C 1 of a 0.1 μ F.
In conjunction with Fig. 1, in the utility model scan type LED display screen holding circuit, owing to being provided with described pull down resistor R2, low level cannot make described integrated circuit 74HC123 trigger final realization can misoperation at described integrated circuit 74HC138.When therefore, power-on serving or input signal are abnormal, can not make the bright scan type LED display screen holding circuit of the irregular unrest of LED display.
Above disclosed is only preferred embodiment of the present utility model, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim, still belongs to the scope that the utility model is contained.
Claims (4)
1. a scan type LED display screen holding circuit; comprise: integrated circuit 74HC245, integrated circuit 74HC138, integrated circuit 74HC123 and translation interface HUB75; the A0 of described integrated circuit 74HC245, A1, A2 port are connected with C, A, the B port of described translation interface HUB75 respectively; the B0 of described integrated circuit 74HC245, B1, B2 port are connected with A0, A1, the A2 port of described integrated circuit 74HC138 respectively, described integrated circuit 74HC138's
port and described integrated circuit 74HC123's
port connects, and it is characterized in that, the A1 port of described integrated circuit 74HC245 is also connected with pull down resistor R2.
2. scan type LED display screen holding circuit as claimed in claim 1, is characterized in that, the resistance of described pull down resistor R2 is 10K.
3. scan type LED display screen holding circuit as claimed in claim 1, is characterized in that, the A3 of described integrated circuit 74HC245, A4, A5, A6, A7, the equal ground connection of GND port.
4. scan type LED display screen holding circuit as claimed in claim 1; it is characterized in that; between the VCC port of described integrated circuit 74HC123 and 1REXT/CEXT port, be in series with the resistance R 1 of a 100K, and between 1REXT/CEXT port and 1CEXT port, be in series with the capacitor C 1 of a 0.1 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420344100.1U CN203966516U (en) | 2014-06-25 | 2014-06-25 | Scan type LED display screen holding circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420344100.1U CN203966516U (en) | 2014-06-25 | 2014-06-25 | Scan type LED display screen holding circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203966516U true CN203966516U (en) | 2014-11-26 |
Family
ID=51927071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420344100.1U Expired - Fee Related CN203966516U (en) | 2014-06-25 | 2014-06-25 | Scan type LED display screen holding circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203966516U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107705749A (en) * | 2017-10-13 | 2018-02-16 | 郑州云海信息技术有限公司 | A kind of display drive method and device |
-
2014
- 2014-06-25 CN CN201420344100.1U patent/CN203966516U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107705749A (en) * | 2017-10-13 | 2018-02-16 | 郑州云海信息技术有限公司 | A kind of display drive method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| USD751082S1 (en) | Display screen with a graphical user interface for an email application | |
| USD855638S1 (en) | Display screen or portion thereof with a graphical user interface | |
| CN203966516U (en) | Scan type LED display screen holding circuit | |
| US20140143466A1 (en) | Computer capable of protecting cpu | |
| CN203968106U (en) | A kind of circuit of realizing multiple industry control message interface type on single face | |
| CN103888796A (en) | Set top box having temperature and humidity display function | |
| CN204243745U (en) | A kind of piezo-resistance anti-surge protection circuit | |
| CN205621097U (en) | Supermarket entry monitoring arrangement | |
| CN204423606U (en) | A kind of Anti-shortsightedness pupil book case | |
| CN204652353U (en) | Debugger D/A converting circuit | |
| CN204350462U (en) | Electronic component | |
| CN204015158U (en) | The sports coat that can facilitate amblyopia crowd to read | |
| CN203883804U (en) | RS232 and digital processor level converting circuit with capacitor floating control | |
| CN203178614U (en) | Ultrasonic distance-measuring glasses | |
| CN205792757U (en) | A kind of can the cell-phone cover of rain cover | |
| CN208690926U (en) | A kind of USB external equipment protection circuit | |
| CN204307291U (en) | Football turns basketball ball cover | |
| CN207766239U (en) | A kind of MCU hardware reset circuits and BMS systems | |
| CN204405976U (en) | A kind of multi-functional glasses | |
| CN204314548U (en) | Sun viewing card | |
| CN204332595U (en) | Combined electronic transformer case | |
| CN204288589U (en) | The Chinese character picture table of comparisons | |
| CN104883164A (en) | Reset circuit and electronic device equipped with same | |
| CN203874461U (en) | Toy handle | |
| CN204496923U (en) | A kind of USB flash disk |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 154600 Qitaihe Xinxing Economic Development Zone, Heilongjiang Patentee after: DECAI OPTOELECTRONICS CO.,LTD. Address before: 154600 Qitaihe Xinxing Economic Development Zone, Heilongjiang Patentee before: DECAI PHOTOELECTRIC Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 |