CN201238340Y - LCD TV for implementing serial port communication by using VGA interface - Google Patents
LCD TV for implementing serial port communication by using VGA interface Download PDFInfo
- Publication number
- CN201238340Y CN201238340Y CNU2008200097863U CN200820009786U CN201238340Y CN 201238340 Y CN201238340 Y CN 201238340Y CN U2008200097863 U CNU2008200097863 U CN U2008200097863U CN 200820009786 U CN200820009786 U CN 200820009786U CN 201238340 Y CN201238340 Y CN 201238340Y
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- vga interface
- liquid crystal
- serial communication
- interface
- cpu
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Abstract
The utility model relates to a liquid crystal television set that uses a VGA interface to realize the serial port communication, which comprises a CPU, a VGA interface and a direct-current power source, wherein, two input ends of the VGA interface are respectively connected with a serially-transmitted data end TXD and a serially-received data end RXD of the CPU. The surplus pins of the ordinary liquid crystal television set with a VGA interface are used as the transmitting data end and the receiving data end for the serial communication, thereby realizing the serial communication of the liquid crystal television set on the premise of no additional interface, and being convenient for the technical personnel to develop and debug the liquid crystal television, and being convenient for the subsequent system maintenance, and reducing the development cost and the maintenance cost.
Description
Technical field
The utility model belongs to the liquid crystal TV set technical field, and matrix ground is said, relates to a kind of liquid crystal TV set that is used for, and utilizes the VGA interface to realize the control circuit of serial communication.
Background technology
Liquid crystal TV set is compared with traditional simulation CRT TV, and the major advantage of liquid crystal TV set is that volume is little, and is in light weight, low radiation, more true to nature, the nature of picture.Particularly the liquid crystal digital TV machine has improved the utilance of frequency resource, utilizes digital compression technology can transmit 4-10 cover TV programme in a standard cable TV analog channel; Improve the transmission and the quality of reception of TV signal, can guarantee that the user receives and the essentially identical TV signal of front end broadcast effect; Progressively change the traditional watching habit of spectators, watch that by passive video request program (VOD) watches.But because LCD TV is started late, various technology are ripe not enough, and particularly therefore easier going wrong aspect software, need often the liquid crystal TV set in house software to be debugged to upgrade upgrading.Existing LCD TV is not equipped with effective software debugging interface, therefore, technological development personnel's debugging and maintenance work has been brought many inconvenience; Some LCD TV in back cover die sinking benevolence, and is appended RS232 communication interface circuit and element by adding cost on circuit board, for technical staff's debugging and maintenance.
The purpose of this utility model just is to overcome above-mentioned shortcoming and defect, provides a kind of simple in structure, need not increase extra cost, has made things convenient for liquid crystal TV set technological development personnel's software debugging and maintenance work, promotes efficient.
Summary of the invention
In order to overcome in the prior art, LCD TV is not equipped with effective software debugging interface, thereby debugging and maintenance work to the technological development personnel have brought the problem of many inconvenience, a kind of novel LCD TV debug circuit is provided, under the prerequisite that does not increase the additional interface cost, replace the software debugging interface by the VGA interface that rationally utilizes liquid crystal TV set, its circuit structure is simple, has saved cost.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical programs:
A kind of liquid crystal TV set that utilizes the VGA interface to realize serial communication comprises CPU, VGA interface and DC power supply.In described VGA interface, wherein the two-way input connects serial ports transmission data terminal TXD and the serial ports reception data terminal RXD of CPU respectively.As the further qualification to such scheme, the bus input end of described VGA interface is respectively hung oneself and one is passed by the stream protective resistance and connect the serial bus end of described CPU.In addition, the serial bus input of VGA interface connects one road voltage clamp circuit and filter capacitor separately through described overcurrent protection resistance.
Compared with prior art, what good effect of advantage of the present utility model is: the pin more than needed of the VGA interface that the general liquid crystal TV set of the utility model utilization carries is as the transmission data terminal and the reception data terminal of serial communication, under the prerequisite that does not increase additional interface, realize serial communication to liquid crystal TV set, made things convenient for the exploitation debugging of technical staff to liquid crystal TV set, and system maintenance work in the future, reduced development cost and maintenance cost.Chip has effectively been protected in the damage that the transient peak pulse that utilizes voltage stabilizing didoe clamp circuit and filter capacitor to prevent that the VGA plug from causing when hot-swappable simultaneously causes chip, has improved the liquid crystal TV set reliability of products.
Description of drawings
Fig. 1 is that the utility model utilizes the VGA interface to realize the schematic diagram of the liquid crystal TV set of serial communication.
The matrix execution mode
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Among Fig. 1, the VGA signal enters liquid crystal TV set by VGA interface D-SUB, wherein 1 ~ 3 pin inserts rgb signal R-IN1, G-IN1, B-IN1,13,14 pin insert capable field sync signal HS, VS respectively, 12 and 15 pin are incoming data signal and clock signal VGA-SDA, VGA-SCL respectively, 9 pin meet DC power supply VCC5V, and 4 and 11 pin insert the needed serial ports of serial communication respectively and send data terminal TXD and serial ports reception data terminal RXD.Wherein, 4 pin send data terminal through the serial ports that protective resistance R101 connects CPU, and 11 pin are accepted data terminal through the serial ports that protective resistance R102 connects CPU, and the serial ports of finishing liquid crystal TV set transmits and receives an assignment.
In addition, in order to suppress the damage that transient peak pulse that the VGA plug causes when hot-swappable causes chip, the VGA interface 4 with 11 pin on be connected one road voltage clamp circuit and filter capacitor respectively.The negative pole of voltage stabilizing didoe ZD101 is received 4 pin, and positive pole is received ground, and capacitor C 102 is received 4 pin, and the other end is received ground; The negative pole of voltage stabilizing didoe ZD102 is received 11 pin, and positive pole is received ground, and capacitor C 101 is received 11 pin, and the other end receives ground.Electric current to ground, prevents that bigger electric current from flowing into cpu chip, plays and protect the chip circuit function effectively by diode like this.
The utility model has been realized serial communication to liquid crystal TV set by adopting above-mentioned simple circuit configuration, has greatly made things convenient for the exploitation debugging of technical staff to liquid crystal TV set, and system maintenance work in the future, effectively reduces development cost and maintenance cost.
Claims (4)
1. a liquid crystal TV set that utilizes the VGA interface to realize serial communication comprises CPU, VGA interface and DC power supply, it is characterized in that: wherein the two-way input connects serial ports transmission data terminal TXD and the serial ports reception data terminal RXD of CPU respectively.
2. the liquid crystal TV set that utilizes the VGA interface to realize serial communication according to claim 1, it is characterized in that the PIN4 of described VGA interface (D-Sub) is used for the transmission data terminal (TXD) of serial communication, PIN11 is used for the reception data terminal (RXD) of serial communication.
3. the liquid crystal TV set that utilizes the VGA interface to realize serial communication according to claim 2 is characterized in that the PIN4 of described VGA interface (D-Sub) and PIN11 carry out the data transmission by overcurrent protection resistance and CPU.
4. the liquid crystal TV set that utilizes the VGA interface to realize serial communication according to claim 3 is characterized in that all being connected with voltage stabilizing didoe and filter capacitor between the PIN4 (TXD) of described VGA interface (D-Sub) and PIN11 (RXD) and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200097863U CN201238340Y (en) | 2008-05-31 | 2008-05-31 | LCD TV for implementing serial port communication by using VGA interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200097863U CN201238340Y (en) | 2008-05-31 | 2008-05-31 | LCD TV for implementing serial port communication by using VGA interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201238340Y true CN201238340Y (en) | 2009-05-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200097863U Expired - Fee Related CN201238340Y (en) | 2008-05-31 | 2008-05-31 | LCD TV for implementing serial port communication by using VGA interface |
Country Status (1)
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| CN (1) | CN201238340Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102421010A (en) * | 2011-12-31 | 2012-04-18 | 四川长虹电器股份有限公司 | Software debugging system and method compatible to video graphics array (VGA) port input |
| CN103686153A (en) * | 2013-12-12 | 2014-03-26 | 京东方科技集团股份有限公司 | Contrast ratio test system |
| CN103729325A (en) * | 2012-10-12 | 2014-04-16 | 成都众易通科技有限公司 | Serial port RS232 interface circuit based on GPS system |
| CN104424911A (en) * | 2013-08-26 | 2015-03-18 | 英业达科技有限公司 | VGA interface protection circuit |
| CN105760333A (en) * | 2016-02-01 | 2016-07-13 | 浪潮(北京)电子信息产业有限公司 | Serial interface system |
| CN107147903A (en) * | 2017-06-05 | 2017-09-08 | 深圳Tcl新技术有限公司 | The debugging serial port circuit and television set of television set |
| CN107861899A (en) * | 2017-11-21 | 2018-03-30 | 盛科网络（苏州）有限公司 | A kind of serial line interface |
-
2008
- 2008-05-31 CN CNU2008200097863U patent/CN201238340Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102421010A (en) * | 2011-12-31 | 2012-04-18 | 四川长虹电器股份有限公司 | Software debugging system and method compatible to video graphics array (VGA) port input |
| CN103729325A (en) * | 2012-10-12 | 2014-04-16 | 成都众易通科技有限公司 | Serial port RS232 interface circuit based on GPS system |
| CN104424911A (en) * | 2013-08-26 | 2015-03-18 | 英业达科技有限公司 | VGA interface protection circuit |
| CN104424911B (en) * | 2013-08-26 | 2016-08-31 | 英业达科技有限公司 | Video graphics array (VGA) interface protective circuit |
| CN103686153A (en) * | 2013-12-12 | 2014-03-26 | 京东方科技集团股份有限公司 | Contrast ratio test system |
| CN103686153B (en) * | 2013-12-12 | 2016-07-06 | 京东方科技集团股份有限公司 | A kind of contrast test system |
| CN105760333A (en) * | 2016-02-01 | 2016-07-13 | 浪潮(北京)电子信息产业有限公司 | Serial interface system |
| CN107147903A (en) * | 2017-06-05 | 2017-09-08 | 深圳Tcl新技术有限公司 | The debugging serial port circuit and television set of television set |
| CN107861899A (en) * | 2017-11-21 | 2018-03-30 | 盛科网络（苏州）有限公司 | A kind of serial line interface |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20110531 |