CN201237888Y - Interface circuit for implementing VGA input/output function of computer integrated machine - Google Patents
Interface circuit for implementing VGA input/output function of computer integrated machine Download PDFInfo
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- CN201237888Y CN201237888Y CNU2008201318454U CN200820131845U CN201237888Y CN 201237888 Y CN201237888 Y CN 201237888Y CN U2008201318454 U CNU2008201318454 U CN U2008201318454U CN 200820131845 U CN200820131845 U CN 200820131845U CN 201237888 Y CN201237888 Y CN 201237888Y
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Abstract
An interface circuit which realizes the VGA input and output function of an all-in-one PC comprises an external VGA interface, an input signal switch, a VGA signal load coupling cock and a displayer driver module. The external VGA interface is connected with the output end of the input signal switch and the displayer driver module electrically; R, G and B paths of the VGA signal of the all-in-one PC internal PC and three default load resistances are connected with the input end of the input signal switch electrically; the three load resistances are connected with a ground circuit by the VGA signal load coupling cock; and the control pin of the VGA signal load coupling cock is connected with the VGA interface electrically. Using the on-off state of the all-in-one PC internal PC and the connection state of the external VGA interface and external equipment, the utility model controls the switching of the control interface circuit; R, G and B paths of the VGA signal of the interface circuit obtain normal load; and the input and output function of the VGA interface is realized.
Description
Technical field
The utility model relates to a kind of interface circuit, more specifically, relates to a kind of interface circuit of realizing computer all-in-one machine VGA signal input/output function by single VGA interface.
Background technology
At present, host computer is transferred to display device with the VGA signal that its video card produces by interface circuit, realizes that picture shows; Display shows respective picture by the VGA signal that VGA interface input external unit provides.And host computer and display are integrated in the computer all-in-one machine of one, and both can be used as the computer complete machine to use, can be used as independently again, display uses.During as the VGA input equipment, need to carry 75 Ω loads between the R of VGA interface circuit, G, B path and the ground, and during as the VGA output device, do not need to carry 75 Ω loads between the R of VGA interface circuit, G, B path and the ground.But most computer all-in-one machine products only have single external VGA interface, use traditional VGA circuit to carry or do not carry 75 Ω loads, correspondingly can only realize VGA input or VGA output function, can't make this machine both have the VGA input function, have the VGA output function again.
Summary of the invention
The technical problems to be solved in the utility model is, at the above-mentioned defective of prior art, provides a kind of interface circuit that can realize computer all-in-one machine VGA signal input/output function.
The technical scheme that its technical matters that solves the utility model adopts is: construct a kind of VGA signal switching circuit, different user modes at the VGA interface, the VGA signal circuit is switched accordingly, under the prerequisite that does not increase extra VGA interface, with simple circuit, the computer all-in-one machine of external single VGA interface is realized the input of VGA signal, output function.
In VGA interface circuit described in the utility model, described signal switching circuit comprises: external VGA interface is electrically connected with the display driver module; R, G, B path, the default pull-up resistor of the inner video card VGA of computer all-in-one machine interface are electrically connected with the input end of input signal change-over switch; The output terminal of input signal change-over switch reaches default pull-up resistor and is electrically connected with external VGA interface, display driver module; The control end of input signal change-over switch is electrically connected with the microprocessor of display driver module; VGA signal load coupling cock is electrically connected with pull-up resistor, external VGA interface.
When the PC of computer all-in-one machine partly works, the microprocessor control input signals change-over switch of display driver module, the VGA signal that gating PC video card provides, and import to the display driver module, connect or the disconnection other display equipment by external VGA interface, VGA signal load coupling cock can disconnect or be communicated with pull-up resistor, realizes the normal VGA signal picture of computer all-in-one machine PC part and the function of outside outputting VGA signal of showing; When computer all-in-one machine as display independently, inner PC is in closed condition, and connect other VGA signal output apparatus when the display driver module is imported outside VGA signal by external VGA interface, VGA signal load coupling cock turn-offs, the microprocessor control input signals change-over switch of display driver module, the pull-up resistor that gating is default is realized the normal function that shows outside input VGA signal picture.
The beneficial effects of the utility model are, under the prerequisite that does not increase extra VGA interface, by a kind of VGA signal switching circuit, different user modes at the VGA interface, the VGA signal circuit is switched accordingly, realize the input of computer all-in-one machine VGA signal, the output function of external single VGA interface, saved cost, expanded the usable range of computer all-in-one machine.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit theory diagrams of preferred embodiment of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprises input signal change-over switch U1, VGA signal load coupling cock Q1, Q2, Q3.The R of the inner PC video card of computer all-in-one machine VGA interface, G, B path and 3 default pull-up resistor R4, R5, R6 is electrically connected with the input end of input signal change-over switch U1, the output terminal of input signal change-over switch U1 and the R of external VGA interface, G, the B path, the speed VGA signal R of dynamic model piece of display, G, B input end and 3 pull-up resistor R1, R2, R3 is electrically connected, VGA signal load coupling cock Q1, Q2, Q3 and 3 pull-up resistor R1, R2, R3 is electrically connected, and VGA signal load coupling cock Q1, Q2, the control pin of Q3 is electrically connected with the 10th pin of external VGA interface, and be electrically connected with direct supply through a resistance R 7, the row of external VGA interface, field sync signal VGA-HS, the row of VGA-VS path and inner PC video card VGA interface, field sync signal PC-HS, the VGA signal rows of PC-VS path and display driver module, the field synchronization input end is electrically connected, and the control end of input signal change-over switch U1 is electrically connected with the microprocessor of display driver module.
VGA signal change action process:
1. when computer all-in-one machine uses as display independently, its inner PC is in closed condition, the VGA signal of inner PC is not provided, 3 default pull-up resistor R4 of microprocessor control input signals change-over switch U1 gating of display driver module, R5, R6, external VGA interface connects other external unit inputs VGA signal, because the 10th pin of VGA interface links to each other with the ground of external unit VGA interface circuit, VGA signal load coupling cock Q1, Q2, Q3 turn-offs, block 3 pull-up resistor R1, R2, being connected between R3 and circuit ground, make VGA signal R, G, the B path has obtained normal load, has realized the function of outside VGA signal input.
2. work as computer all-in-one machine PC and partly be in open state, the VGA signal R of the inner PC of the microprocessor control input signals change-over switch U1 gating of display driver module, G, the B path, the VGA signal of PC is imported to the display driver module, when external VGA interface does not connect other VGA display devices, because VGA signal load coupling cock Q1, Q2, the control pin of Q3 connects direct supply VCC by resistance R 7, VGA signal load coupling cock Q1, Q2, Q3 is connected state, 3 pull-up resistor R1, R2, R3 is connected with circuit ground, inner VGA signal R, G, the B path has obtained normal load, and the computer all-in-one machine display screen can show normal PC picture.
3. work as computer all-in-one machine PC and partly be in open state, the VGA signal R of the inner PC of the microprocessor control input signals change-over switch U1 gating of display driver module, G, the B path, the VGA signal of PC is imported to the display driver module, when external VGA interface connects other VGA display devices, because the 10th pin of VGA interface links to each other with the ground of external display device VGA interface circuit, VGA signal load coupling cock Q1, Q2, Q3 turn-offs, block 3 pull-up resistor R1, R2, being connected between R3 and circuit ground, simultaneously, the standard termination that the external display device VGA interface that utilization is connected is had, the computer all-in-one machine display screen can show normal PC picture, and can realize the function of VGA signal output normally to other VGA display device outputting VGA signals.
Claims (4)
1, a kind of interface circuit of realizing computer all-in-one machine VGA input/output function, comprise the circuit that display driver module, external VGA interface are electrically connected with VGA signal R, G, B path pull-up resistor, it is characterized in that, also comprise: be connected with described VGA interface and realize the VGA input/output function signal switching circuit.
2, the interface circuit of realization computer all-in-one machine VGA input/output function according to claim 1, it is characterized in that: in the VGA signal switching circuit, comprise input signal change-over switch U1, the input end of this change-over switch is electrically connected with VGA signal R, G, B path and 3 default pull-up resistor R4, R5, R6 of the inner PC of computer all-in-one machine, and the output terminal of input signal change-over switch U1 is electrically connected with VGA signal R, G, B input end and 3 pull-up resistor R1, R2, R3 of external VGA interface, display driver module.
3, the interface circuit of realization computer all-in-one machine VGA interface input/output function according to claim 1, it is characterized in that: in VGA signal input/output control circuit, comprise VGA signal load coupling cock Q1, Q2, Q3,3 pull-up resistor R1, R2, R3 through this coupling cock and circuit be electrically connected, the control pin of VGA signal load coupling cock Q1, Q2, Q3 is electrically connected with the 10th pin of external VGA interface, and is electrically connected with direct supply through a resistance R 7.
4, the interface circuit of realization computer all-in-one machine VGA input/output function according to claim 1, it is characterized in that: in computer all-in-one machine display driver module, comprise microprocessor, microprocessor is electrically connected with the control end of input signal change-over switch U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201318454U CN201237888Y (en) | 2008-08-07 | 2008-08-07 | Interface circuit for implementing VGA input/output function of computer integrated machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201318454U CN201237888Y (en) | 2008-08-07 | 2008-08-07 | Interface circuit for implementing VGA input/output function of computer integrated machine |
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| Publication Number | Publication Date |
|---|---|
| CN201237888Y true CN201237888Y (en) | 2009-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201318454U Expired - Fee Related CN201237888Y (en) | 2008-08-07 | 2008-08-07 | Interface circuit for implementing VGA input/output function of computer integrated machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567265A (en) * | 2010-12-11 | 2012-07-11 | 鸿富锦精密工业（深圳）有限公司 | Touch module switching circuit for all-in-one computer |
| CN103019316A (en) * | 2012-11-23 | 2013-04-03 | 广州视睿电子科技有限公司 | Method and system for identifying access signal by using integrated machine |
| CN104252324A (en) * | 2013-06-25 | 2014-12-31 | 研祥智能科技股份有限公司 | System and method for dynamically simulating VGA (Video Graphic Array) signals |
| CN105407298A (en) * | 2015-10-10 | 2016-03-16 | 浙江大华技术股份有限公司 | VGA matrix switching circuit and method |
| CN106445432A (en) * | 2015-08-10 | 2017-02-22 | 联想(北京)有限公司 | Terminal device, and control method and apparatus |
| CN107293270A (en) * | 2016-04-05 | 2017-10-24 | 深圳市亿威尔信息技术股份有限公司 | The sustainable display system normally shown of VGA signals |
-
2008
- 2008-08-07 CN CNU2008201318454U patent/CN201237888Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567265A (en) * | 2010-12-11 | 2012-07-11 | 鸿富锦精密工业（深圳）有限公司 | Touch module switching circuit for all-in-one computer |
| CN102567265B (en) * | 2010-12-11 | 2016-01-20 | 赛恩倍吉科技顾问（深圳）有限公司 | Touch module switching circuit for all-in-one computer |
| CN103019316A (en) * | 2012-11-23 | 2013-04-03 | 广州视睿电子科技有限公司 | Method and system for identifying access signal by using integrated machine |
| CN103019316B (en) * | 2012-11-23 | 2016-05-25 | 广州视睿电子科技有限公司 | The method and system of all-in-one identification access signal |
| CN104252324A (en) * | 2013-06-25 | 2014-12-31 | 研祥智能科技股份有限公司 | System and method for dynamically simulating VGA (Video Graphic Array) signals |
| CN104252324B (en) * | 2013-06-25 | 2019-01-04 | 研祥智能科技股份有限公司 | The system and method for dynamic analog Video Graphics Array signal |
| CN106445432A (en) * | 2015-08-10 | 2017-02-22 | 联想(北京)有限公司 | Terminal device, and control method and apparatus |
| CN106445432B (en) * | 2015-08-10 | 2020-05-26 | 联想(北京)有限公司 | Terminal device, control method and device |
| CN105407298A (en) * | 2015-10-10 | 2016-03-16 | 浙江大华技术股份有限公司 | VGA matrix switching circuit and method |
| CN105407298B (en) * | 2015-10-10 | 2019-02-12 | 浙江大华技术股份有限公司 | A kind of VGA Inverse problem circuit and method |
| CN107293270A (en) * | 2016-04-05 | 2017-10-24 | 深圳市亿威尔信息技术股份有限公司 | The sustainable display system normally shown of VGA signals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160801 Address after: Ten, 518000 floor, new world industrial town, Bantian street, Shenzhen District, Longgang District, Guangdong, China Patentee after: Shenzhen Shenzhou Creative Technology Limited Address before: 518112 new world industrial city, Shenzhen, Longgang, Guangdong Patentee before: Shenzhen Hasee Computer Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20160807 |