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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
一种实现电脑一体机VGA输入输出功能的接口电路，包括外置VGA接口、输入信号切换开关、VGA信号负载连通开关及显示器驱动模块。外置VGA接口与输入信号切换开关输出端及显示器驱动模块电连接，电脑一体机内部PC的VGA信号R、G、B通路及3个预设负载电阻与输入信号切换开关输入端电连接，3个负载电阻通过VGA信号负载连通开关连接电路地，VGA信号负载连通开关的控制脚与VGA接口电连接。利用电脑一体机内部PC开、关机状态及外置VGA接口连接外部设备的状态，控制接口电路进行切换，使接口电路的VGA信号R、G、B通路获取正常的负载，实现VGA接口的输入输出功能。
An interface circuit for realizing VGA input and output functions of an all-in-one computer includes an external VGA interface, an input signal switching switch, a VGA signal load connection switch and a display driver module. The external VGA interface is electrically connected to the output terminal of the input signal switching switch and the display driver module, and the VGA signal R, G, and B channels of the PC inside the all-in-one computer and 3 preset load resistors are electrically connected to the input terminal of the input signal switching switch, 3 The two load resistors are connected to the circuit ground through the VGA signal load connection switch, and the control pin of the VGA signal load connection switch is electrically connected to the VGA interface. Use the internal PC power on and off status of the computer all-in-one machine and the status of the external VGA interface to connect to external devices to control the switching of the interface circuit, so that the VGA signal R, G, and B channels of the interface circuit can obtain normal loads and realize the input and output of the VGA interface. Function.
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)
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 |
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| 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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| CN201237888Y true CN201237888Y (en) | 2009-05-13 |
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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 all-in-one 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 all-in-one machine |
| CN103019316B (en) * | 2012-11-23 | 2016-05-25 | 广州视睿电子科技有限公司 | Method and system for identifying access signal by all-in-one 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 |
| 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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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. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20160807 |
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| CF01 | Termination of patent right due to non-payment of annual fee |