CN112347016A - Dual-video input switching device and control method of tablet computer - Google Patents
Dual-video input switching device and control method of tablet computer Download PDFInfo
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- CN112347016A CN112347016A CN202011013754.2A CN202011013754A CN112347016A CN 112347016 A CN112347016 A CN 112347016A CN 202011013754 A CN202011013754 A CN 202011013754A CN 112347016 A CN112347016 A CN 112347016A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0016—Inter-integrated circuit (I2C)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a dual-video input switching device and a control method of a tablet computer, wherein the switching device comprises a local DVO interface, a DVO-to-HDMI module, an external VGA input interface, a VGA-to-HDMI module, a switching control circuit, an HDMI 2-to-1 module and an HDMI-to-LVDS module; the DVO interface of the machine is connected with the DVO-to-HDMI module, the external VGA input interface is connected with the VGA-to-HDMI module, the DVO-to-HDMI module and the VGA-to-HDMI module are connected with the HDMI2 switch 1 module, the HDMI2 switch 1 module is connected with the HDMI-to-LVDS module, the switching control circuit comprises a dial switch and a single chip microcomputer, and the single chip microcomputer is respectively connected with the DVO-to-HDMI module, the VGA-to-HDMI module, the HDMI2 switch 1 module and the HDMI-to-LVDS module. The invention has the advantages and beneficial effects that: the switching of DVO signals and VGA signals is converted into HDMI signals for switching, the number of switching signal lines is extremely small, and the switching mode is simpler; the singlechip dynamically configures each display chip for initialization, can meet the real-time switching of screens with different resolutions, and has wider support range of the display resolution.
Description
Technical Field
The invention relates to the field of computer communication, in particular to a dual-video input switching device of a tablet computer and a control method.
Background
With the rapid development of the localization process, the autonomous controllable requirements of the military industry put higher requirements on the video display technology of the computer system, the common video display interfaces of the tablet computer in the military computer system comprise a VGA interface, a DVO interface, an LVDS interface and the like, and because of the portable display requirements, the localization tablet computer needs to realize the real-time switching of the display between the external input VGA signal and the local output DVO signal and the display through the LVDS interface.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for realizing dual-video input switching of a tablet computer, which can realize real-time display switching between an external input VGA signal and a local output DVO signal.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a dual-video input switching device of a tablet computer comprises a local DVO interface, a DVO to HDMI (digital video interface to high definition multimedia interface) module, an external VGA input interface, a VGA to HDMI module, a switching control circuit, an HDMI2 to 1 module and an HDMI to LVDS module; the DVO interface of the machine is connected with the DVO-to-HDMI module, the external VGA input interface is connected with the VGA-to-HDMI module, the DVO-to-HDMI module and the VGA-to-HDMI module are connected with the HDMI2 switch 1 module, the HDMI2 switch 1 module is connected with the HDMI-to-LVDS module, and the switching control circuit is respectively connected with the DVO-to-HDMI module, the VGA-to-HDMI module, the HDMI2 switch 1 module and the HDMI-to-LVDS module.
The local DVO interface adopts a QTH-030-01-L-D-A high-speed connector to realize the access of DVO signals.
The DVO-to-HDMI module adopts an LT8618SXB chip to realize the switching from a DVO video signal to an HDMI signal.
The external VGA input interface comprises a VGA connector, particularly a D-SUB15FAMALE connector, and realizes the input of external VGA signals.
The VGA-to-HDMI module adopts an LT8522X chip to realize conversion from VGA signals to HDMI signals.
The switching control circuit comprises a dial switch and a single chip microcomputer circuit, and specifically comprises an 418127270901 switch and an ATMEGA128L single chip microcomputer.
The HDMI2 cutting 1 module adopts an LT8631UX chip to realize the double-path real-time switching function of HDMI signals.
The HDMI-to-LVDS module adopts an LT8619B chip to realize protocol conversion from an HDMI signal to an LVDS signal.
The use method of the switching device comprises the following steps:
in native DVO output mode:
the first step is as follows: the DVO-to-HDMI module receives the DVO display signal and detects EDID information of the display, and the single chip accesses the DVO-to-HDMI module through the IIC bus to read the EDID information of the screen;
the second step is that: the single chip microcomputer adapts display configuration parameters of corresponding resolution of the DVO-to-HDMI module according to the EDID information, and initializes the DVO-to-HDMI module through the IIC configuration bus;
the third step: the single chip microcomputer detects the state of the switch and configures an HDMI2 switching 1 module to be switched into a DVO channel for output through an IIC bus protocol;
the fourth step: the single chip microcomputer adapts display configuration parameters of the resolution corresponding to the HDMI to LVDS module according to the EDID information, and initializes the HDMI to LVDS module through the IIC configuration bus;
when the external VGA interface inputs the mode:
the first step is as follows: the VGA changes the HDMI module and receives VGA display signal to detect display EDID information, the singlechip passes through IIC bus access VGA to change the HDMI module, reads screen EDID information.
The second step is that: the single chip microcomputer is used for adapting display configuration parameters of the resolution corresponding to the VGA-to-HDMI module according to the EDID information and initializing the VGA-to-HDMI module through an IIC configuration bus;
the third step: the single chip microcomputer detects the state of the change-over switch, and configures an HDMI2 switch 1 module to switch to VGA channel output through an IIC bus protocol;
the fourth step: the single chip microcomputer adapts display configuration parameters of the resolution corresponding to the HDMI to LVDS module according to the EDID information, and initializes the HDMI to LVDS module through the IIC configuration bus.
The invention has the advantages and beneficial effects that:
the dual-video input switching implementation method of the domestic tablet computer converts the switching of the DVO signal and the VGA signal into the HDMI signal for switching, the number of switching signal lines is extremely small, and the switching mode is simpler; the singlechip dynamically configures each display chip for initialization, can meet the real-time switching of screens with different resolutions, and has wider support range of the display resolution.
Drawings
Fig. 1 is a schematic structural diagram of a dual video input switching device of a tablet computer according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 1, a dual video input switching device for a tablet computer includes a local DVO interface, a DVO to HDMI module, an external VGA input interface, a VGA to HDMI module, a switching control circuit, an HDMI2 to 1 module, and an HDMI to LVDS module; the DVO interface of the machine is connected with the DVO-to-HDMI module, the external VGA input interface is connected with the VGA-to-HDMI module, the DVO-to-HDMI module and the VGA-to-HDMI module are connected with the HDMI2 switch 1 module, the HDMI2 switch 1 module is connected with the HDMI-to-LVDS module, and the switching control circuit is respectively connected with the DVO-to-HDMI module, the VGA-to-HDMI module, the HDMI2 switch 1 module and the HDMI-to-LVDS module.
The local DVO interface adopts a QTH-030-01-L-D-A high-speed connector to realize the access of DVO signals.
The DVO-to-HDMI module adopts an LT8618SXB chip to realize the switching from a DVO video signal to an HDMI signal.
The external VGA input interface comprises a VGA connector, particularly a D-SUB15FAMALE connector, and realizes the input of external VGA signals.
The VGA-to-HDMI module adopts an LT8522X chip to realize conversion from VGA signals to HDMI signals.
The switching control circuit comprises a dial switch and a single chip microcomputer circuit, and specifically comprises an 418127270901 switch and an ATMEGA128L single chip microcomputer.
The HDMI2 cutting 1 module adopts an LT8631UX chip to realize the double-path real-time switching function of HDMI signals.
The HDMI-to-LVDS module adopts an LT8619B chip to realize protocol conversion from an HDMI signal to an LVDS signal.
The use method of the switching device comprises the following steps:
in native DVO output mode:
the first step is as follows: the DVO-to-HDMI module receives the DVO display signal and detects EDID information of the display, and the single chip accesses the DVO-to-HDMI module through the IIC bus to read the EDID information of the screen;
the second step is that: the single chip microcomputer adapts display configuration parameters of corresponding resolution of the DVO-to-HDMI module according to the EDID information, and initializes the DVO-to-HDMI module through the IIC configuration bus;
the third step: the single chip microcomputer detects the state of the switch and configures an HDMI2 switching 1 module to be switched into a DVO channel for output through an IIC bus protocol;
the fourth step: the single chip microcomputer adapts display configuration parameters of the resolution corresponding to the HDMI to LVDS module according to the EDID information, and initializes the HDMI to LVDS module through the IIC configuration bus;
when the external VGA interface inputs the mode:
the first step is as follows: the VGA changes the HDMI module and receives VGA display signal to detect display EDID information, the singlechip passes through IIC bus access VGA to change the HDMI module, reads screen EDID information.
The second step is that: the single chip microcomputer is used for adapting display configuration parameters of the resolution corresponding to the VGA-to-HDMI module according to the EDID information and initializing the VGA-to-HDMI module through an IIC configuration bus;
the third step: the single chip microcomputer detects the state of the change-over switch, and configures an HDMI2 switch 1 module to switch to VGA channel output through an IIC bus protocol;
the fourth step: the single chip microcomputer adapts display configuration parameters of the resolution corresponding to the HDMI to LVDS module according to the EDID information, and initializes the HDMI to LVDS module through the IIC configuration bus.
The above examples are merely for illustrative clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A dual-video input switching device of a tablet computer is characterized by comprising a local DVO interface, a DVO-to-HDMI module, an external VGA input interface, a VGA-to-HDMI module, a switching control circuit, an HDMI 2-to-1 module and an HDMI-to-LVDS module; the DVO interface of the machine is connected with the DVO-to-HDMI module, the external VGA input interface is connected with the VGA-to-HDMI module, the DVO-to-HDMI module and the VGA-to-HDMI module are connected with the HDMI2 switch 1 module, the HDMI2 switch 1 module is connected with the HDMI-to-LVDS module, the switching control circuit comprises a dial switch and a single chip microcomputer, and the single chip microcomputer is respectively connected with the DVO-to-HDMI module, the VGA-to-HDMI module, the HDMI2 switch 1 module and the HDMI-to-LVDS module.
2. The dual-video-input switching device of a tablet computer according to claim 1, wherein the local DVO interface employs a QTH-030-01-L-D-a high-speed connector to enable access of DVO signals.
3. The dual video input switching device of claim 1, wherein the DVO to HDMI module employs an LT8618SXB chip to implement switching from a native DVO video signal to an HDMI signal.
4. The dual video input switching device of claim 1, wherein the external VGA input interface comprises a VGA connector, particularly a D-SUB15FAMALE connector, for inputting external VGA signals.
5. The dual video input switching device of the tablet computer according to claim 1, wherein the VGA to HDMI module employs an LT8522X chip to realize conversion from VGA signals to HDMI signals.
6. The dual video input switching device of a tablet computer as claimed in claim 1, wherein the dial switch is 418127270901 switch, and the single chip microcomputer is ATMEGA128L single chip microcomputer.
7. The dual video input switching device of a tablet computer according to claim 1, wherein the HDMI 2-to-1 module employs an LT8631UX chip to implement a dual-path real-time switching function of HDMI signals.
8. The dual video input switching device of a tablet computer according to claim 1, wherein the HDMI-to-LVDS module employs an LT8619B chip to implement protocol conversion from an HDMI signal to an LVDS signal.
9. The method for controlling a dual video input switching apparatus of a tablet computer according to any one of claims 1 to 8, comprising the steps of:
in native DVO output mode:
the first step is as follows: the DVO-to-HDMI module receives the DVO display signal and detects EDID information of the display, and the single chip accesses the DVO-to-HDMI module through the IIC bus to read the EDID information of the screen;
the second step is that: the single chip microcomputer adapts display configuration parameters of corresponding resolution of the DVO-to-HDMI module according to the EDID information, and initializes the DVO-to-HDMI module through the IIC configuration bus;
the third step: the single chip microcomputer detects the state of the switch and configures an HDMI2 switching 1 module to be switched into a DVO channel for output through an IIC bus protocol;
the fourth step: the single chip microcomputer adapts display configuration parameters of the resolution corresponding to the HDMI to LVDS module according to the EDID information, and initializes the HDMI to LVDS module through the IIC configuration bus;
when the external VGA interface inputs the mode:
the first step is as follows: the VGA changes the HDMI module and receives VGA display signal to detect display EDID information, the singlechip passes through IIC bus access VGA to change the HDMI module, reads screen EDID information.
The second step is that: the single chip microcomputer is used for adapting display configuration parameters of the resolution corresponding to the VGA-to-HDMI module according to the EDID information and initializing the VGA-to-HDMI module through an IIC configuration bus;
the third step: the single chip microcomputer detects the state of the change-over switch, and configures an HDMI2 switch 1 module to switch to VGA channel output through an IIC bus protocol;
the fourth step: the single chip microcomputer adapts display configuration parameters of the resolution corresponding to the HDMI to LVDS module according to the EDID information, and initializes the HDMI to LVDS module through the IIC configuration bus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011013754.2A CN112347016A (en) | 2020-09-24 | 2020-09-24 | Dual-video input switching device and control method of tablet computer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011013754.2A CN112347016A (en) | 2020-09-24 | 2020-09-24 | Dual-video input switching device and control method of tablet computer |
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| CN112347016A true CN112347016A (en) | 2021-02-09 |
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| CN202011013754.2A Withdrawn CN112347016A (en) | 2020-09-24 | 2020-09-24 | Dual-video input switching device and control method of tablet computer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114625682A (en) * | 2021-06-28 | 2022-06-14 | 江苏航天龙梦信息技术有限公司 | Method and system for outputting HDMI signal based on Loongson centralized display |
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| US20090079717A1 (en) * | 2007-09-21 | 2009-03-26 | Mstar Semiconductor, Inc. | Quick Port-Switching Method and Associated Apparatus |
| CN107529025A (en) * | 2017-09-06 | 2017-12-29 | 广东视腾电子科技有限公司 | A kind of display with picture segmentation display function |
| CN208207667U (en) * | 2018-06-20 | 2018-12-07 | 山东超越数控电子股份有限公司 | A kind of all-in-one machine that the display can be used as other computers uses |
| CN210955057U (en) * | 2020-03-16 | 2020-07-07 | 烟台北方星空自控科技有限公司 | System with video and USB signal switching function |
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2020
- 2020-09-24 CN CN202011013754.2A patent/CN112347016A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070186015A1 (en) * | 2006-02-08 | 2007-08-09 | Taft Frederick D | Custom edid content generation system and method |
| US20090079717A1 (en) * | 2007-09-21 | 2009-03-26 | Mstar Semiconductor, Inc. | Quick Port-Switching Method and Associated Apparatus |
| CN107529025A (en) * | 2017-09-06 | 2017-12-29 | 广东视腾电子科技有限公司 | A kind of display with picture segmentation display function |
| CN208207667U (en) * | 2018-06-20 | 2018-12-07 | 山东超越数控电子股份有限公司 | A kind of all-in-one machine that the display can be used as other computers uses |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114625682A (en) * | 2021-06-28 | 2022-06-14 | 江苏航天龙梦信息技术有限公司 | Method and system for outputting HDMI signal based on Loongson centralized display |
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Application publication date: 20210209 |
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