CN114265803A - Method for multiplexing standard DP interface and supporting USB touch screen - Google Patents
Method for multiplexing standard DP interface and supporting USB touch screen Download PDFInfo
- Publication number
- CN114265803A CN114265803A CN202111312112.7A CN202111312112A CN114265803A CN 114265803 A CN114265803 A CN 114265803A CN 202111312112 A CN202111312112 A CN 202111312112A CN 114265803 A CN114265803 A CN 114265803A
- Authority
- CN
- China
- Prior art keywords
- display
- signal line
- dpc
- screen
- usb
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 101000805129 Homo sapiens Protein DPCD Proteins 0.000 claims abstract description 19
- 102100037836 Protein DPCD Human genes 0.000 claims abstract description 19
- 238000003780 insertion Methods 0.000 claims abstract description 4
- 230000037431 insertion Effects 0.000 claims abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
Images
Landscapes
- Position Input By Displaying (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention discloses a method for multiplexing and supporting a USB touch screen by a standard DP interface, which comprises the following steps: s1: inserting a DP screen, pulling up an HPD signal line by the screen, and informing the main control equipment of a screen insertion event; s2: the main control equipment requests reading of EDID information from the DP screen through the DPC AUX signal line; s3: the DP display equipment returns the EDID information in S2 to the main control equipment through the DPC AUX signal line; s4: and the main control equipment analyzes the EDID information of the screen and reads the DPCD main link information of the DP display screen through the DPC AUX signal line. The invention can dynamically switch one group of DPC _ D3 in 4 groups of differential signal lines between DP video signals and USB signals, thus not only enabling the customized DP display equipment to support touch function through the general DP line, but also having no influence on the general DP display equipment, satisfying the use requirement and being beneficial to use.
Description
Technical Field
The invention relates to the technical field of USB touch screens, in particular to a method for multiplexing and supporting a USB touch screen by a standard DP interface.
Background
The DP interface is a digital video interface standard developed by PC and chip manufacturers alliance and standardized by Video Electronics Standard Association (VESA), and is generally used for transmitting video and audio data, and it is composed of 20 pins in total, and includes 4 groups of differential signal lines DPC _ D0-DPC _ D3 for transmitting video signals, and 1 group of differential signal lines DPC _ AUX for connection and device management.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for multiplexing and supporting a USB touch screen by a standard DP interface.
The invention provides a method for multiplexing and supporting a USB touch screen by a standard DP interface, which comprises the following steps:
s1: inserting a DP screen, pulling up an HPD signal line by the screen, and informing the main control equipment of a screen insertion event;
s2: the main control equipment requests reading of EDID information from the DP screen through the DPC AUX signal line;
s3: the DP display equipment returns the EDID information in S2 to the main control equipment through the DPC AUX signal line;
s4: the main control equipment analyzes the EDID information of the screen and reads DPCD main link information of the DP display screen through a DPC AUX signal line;
s5: the DP display equipment returns the DPCD main link information described in S4 to the main control equipment through the DPC AUX signal line;
s6, the main control device analyzes the DPCD main link information, if the DP display device main link number is equal to 4, the DP display device is judged to be a universal 4Lane DP display device, the main control device keeps the default configuration of the selector switch, and the DPC D3 differential signal line of the main control device is connected to the DPC D3 signal line of the DP display device; if the number of main links of the DP display device is less than 4, the DP display may be a customized DP display with USB touch or a general DP display with Lane less than 4, for the customized DP device, the DPC D3 signal line is connected with the USB input interface of the touch controller inside the customized DP display, the master control device controls the switch to switch the USB signal of the master control device to the DPC D3 signal line, the touch controller of the DP display and the master control communicate through the USB signal line, so that the touch function of the customized DP display is realized, for the general DP display with Lane less than 4, since the DPC D3 signal input interface inside the general DP display is not connected or is in a high-impedance state, the function is not affected;
s7: the main control equipment sends a DPCD connection configuration request to the DP display equipment through a DPC AUX signal line;
s8: the main control equipment is connected with DP display equipment through a DPC AUX signal line to carry out tracing;
s9: and the DP display equipment returns the DPCD connection state to the main control equipment through the DPC AUX signal line, and if the DPCD connection of the DP display equipment is successful, the main control equipment transmits the video data to the DP display equipment through the DPC D0-3.
Preferably, in the S6, a switch chip is built in the switch, the switch chip U101 MHL +/MHL-signal line is connected to the DP _ D3 differential signal of the master device, the USB +/USB-signal line is connected to the USB _ DP and USB _ DM of the master, the D +/D-signal line is connected to the LANE _ P3/LANE _ N3 of the DP connector port of the master device, after power-on, the/OE chip select is pulled down to ground by default, the SEL end is pulled up to VDD high level by default, and is in 4LANE DP mode by default, the DP _ D3 differential signal of the master device is connected to the LANE _ P3/LANE _ N3 differential signal of the DP connector port through the switch chip U101, when the system acquires that the DP display device is in 2LANE mode through the protocol of DP _ AUX, the master device pulls down through the GPIO _ SEL, so that the SEL end of the U101 is pulled down, and the USB _ DP and USB _ DM signals of the master device are connected to the LANE connector port/lan _ P3 through the switch chip U101 N3, LANE _ P3/LANE _ N3 of DP connector port connected to USB touch controller of custom screen through DP connection line, touch screen of custom screen is available.
Compared with the prior art, the invention has the beneficial effects that:
the invention can dynamically switch one group of DPC _ D3 in 4 groups of differential signal lines between DP video signals and USB signals, thus not only enabling the customized DP display equipment to support touch function through the general DP line, but also having no influence on the general DP display equipment, satisfying the use requirement and being beneficial to use.
Drawings
FIG. 1 is a system diagram of a method for multiplexing a standard DP interface to support a USB touch screen according to the present invention;
fig. 2 is a schematic diagram of a switch for multiplexing a standard DP interface and supporting a USB touch screen according to the present invention.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Examples
Referring to fig. 1-2, the present embodiment provides a method for multiplexing a standard DP interface to support a USB touch screen, including the following steps:
s1: inserting a DP screen, pulling up an HPD signal line by the screen, and informing the main control equipment of a screen insertion event;
s2: the main control equipment requests reading of EDID information from the DP screen through the DPC AUX signal line;
s3: the DP display equipment returns the EDID information in S2 to the main control equipment through the DPC AUX signal line;
s4: the main control equipment analyzes the EDID information of the screen and reads DPCD main link information of the DP display screen through a DPC AUX signal line;
s5: the DP display equipment returns the DPCD main link information described in S4 to the main control equipment through the DPC AUX signal line;
s6, the main control device analyzes the DPCD main link information, if the DP display device main link number is equal to 4, the DP display device is judged to be a universal 4Lane DP display device, the main control device keeps the default configuration of the selector switch, and the DPC D3 differential signal line of the main control device is connected to the DPC D3 signal line of the DP display device; if the number of main links of the DP display device is less than 4, the DP display device can be a custom DP display device with USB touch and can also be a general DP display with Lane less than 4, for the custom DP device, a DPC D3 signal line is connected with a USB input interface of a touch controller inside the custom DP display device, a master control device controls a selector switch to switch a USB signal of the master control device to a DPC D3 signal line, the touch controller and the master control of the DP display device communicate through the USB signal line to realize the touch function of the custom DP display screen, for the general DP display with Lane less than 4, the function is not affected because an internal DPC D3 signal input interface is not connected or is in a high-impedance state, wherein a selector switch chip is arranged inside the selector switch, the selector switch chip U101 MHL +/MHL-signal line is butted with a DP _ D3 differential signal of the master control device, and the USB +/USB-signal line is butted with USB _ DP and USB _ DM of the master control device, the D +/D-signal line is butted with LANE _ P3/LANE _ N3 of a DP connector port of the master control device, after the master control device is powered on, an/OE chip selection end is pulled down to the ground by default, an SEL end is pulled up to a VDD high level by default and is in a 4LANE DP mode by default, a DP _ D3 differential signal of the master control device is connected to a LANE _ P3/LANE _ N3 differential signal of the DP connector port through a switch chip U101, when the system acquires that the DP display device is in a 2LANE mode through protocol handshaking of DP _ AUX, the master control device is pulled down through GPIO _ SEL to enable the SEL end of the U101 to be pulled down, USB _ DP and USB _ DM signals of the master control device are connected to LANE _ P3/LANE _ N3 of the DP connector port through the switch chip U101, LANE _ P3/LANE _ N3 of the DP connector port is connected to a USB touch controller of a guest screen through the DP connection line, and the touch screen of the guest screen can be used;
s7: the main control equipment sends a DPCD connection configuration request to the DP display equipment through a DPC AUX signal line;
s8: the main control equipment is connected with DP display equipment through a DPC AUX signal line to carry out tracing;
s9: and the DP display equipment returns the DPCD connection state to the main control equipment through the DPC AUX signal line, and if the DPCD connection of the DP display equipment is successful, the main control equipment transmits the video data to the DP display equipment through the DPC D0-3.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. A method for multiplexing and supporting a USB touch screen by a standard DP interface is characterized by comprising the following steps:
s1: inserting a DP screen, pulling up an HPD signal line by the screen, and informing the main control equipment of a screen insertion event;
s2: the main control equipment requests reading of EDID information from the DP screen through the DPC AUX signal line;
s3: the DP display equipment returns the EDID information in S2 to the main control equipment through the DPC AUX signal line;
s4: the main control equipment analyzes the EDID information of the screen and reads DPCD main link information of the DP display screen through a DPC AUX signal line;
s5: the DP display equipment returns the DPCD main link information described in S4 to the main control equipment through the DPC AUX signal line;
s6, the main control device analyzes the DPCD main link information, if the DP display device main link number is equal to 4, the DP display device is judged to be a universal 4Lane DP display device, the main control device keeps the default configuration of the selector switch, and the DPC D3 differential signal line of the main control device is connected to the DPC D3 signal line of the DP display device; if the number of main links of the DP display device is less than 4, the DP display may be a customized DP display with USB touch or a general DP display with Lane less than 4, for the customized DP device, the DPC D3 signal line is connected with the USB input interface of the touch controller inside the customized DP display, the master control device controls the switch to switch the USB signal of the master control device to the DPC D3 signal line, the touch controller of the DP display and the master control communicate through the USB signal line, so that the touch function of the customized DP display is realized, for the general DP display with Lane less than 4, since the DPC D3 signal input interface inside the general DP display is not connected or is in a high-impedance state, the function is not affected;
s7: the main control equipment sends a DPCD connection configuration request to the DP display equipment through a DPC AUX signal line;
s8: the main control equipment is connected with DP display equipment through a DPC AUX signal line to carry out tracing;
s9: and the DP display equipment returns the DPCD connection state to the main control equipment through the DPC AUX signal line, and if the DPCD connection of the DP display equipment is successful, the main control equipment transmits the video data to the DP display equipment through the DPC D0-3.
2. The method as claimed in claim 1, wherein in S6, a switch chip is built in the switch, the switch chip U101 MHL +/MHL-signal line is connected to DP _ D3 differential signal of the master device, USB +/USB-signal line is connected to USB _ DP and USB _ DM of the master device, D +/D-signal line is connected to LANE _ P3/LANE _ N3 of the DP connector port of the master device, after power-up, the/OE chip select terminal is pulled down to ground by default, the SEL terminal is pulled up to VDD high by default to 4Lane DP mode by default, DP _ D3 differential signal of the master device is connected to LANE _ P3/LANE _ N3 differential signal of the DP connector port through the switch chip U101, when the system acquires DP display device to 2Lane mode through DP _ AUX protocol handshake, the master control is pulled down through GPIO _ SEL, so that the SEL end of the U101 is pulled down, USB _ DP and USB _ DM signals of the master control device are connected to LANE _ P3/LANE _ N3 of the DP connector port through the switching chip U101, LANE _ P3/LANE _ N3 of the DP connector port are connected with the USB touch controller of the custom screen through DP connecting lines, and the touch screen of the custom screen is available.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111312112.7A CN114265803B (en) | 2021-11-08 | 2021-11-08 | Method for supporting USB touch screen by multiplexing standard DP interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111312112.7A CN114265803B (en) | 2021-11-08 | 2021-11-08 | Method for supporting USB touch screen by multiplexing standard DP interface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114265803A true CN114265803A (en) | 2022-04-01 |
| CN114265803B CN114265803B (en) | 2024-06-14 |
Family
ID=80824885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111312112.7A Active CN114265803B (en) | 2021-11-08 | 2021-11-08 | Method for supporting USB touch screen by multiplexing standard DP interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114265803B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117971733A (en) * | 2024-03-29 | 2024-05-03 | 智道网联科技(北京)有限公司 | Touch circuit, vehicle-mounted device mainboard and touch circuit switching method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203552220U (en) * | 2013-11-13 | 2014-04-16 | Tcl集团股份有限公司 | Touch device of multiplex touch display screen |
| CN107239426A (en) * | 2017-06-08 | 2017-10-10 | 山东超越数控电子有限公司 | A kind of structure and method that DP inputs are realized by USB type C |
| CN111506532A (en) * | 2020-04-16 | 2020-08-07 | 深圳市颍创科技有限公司 | Method for fast switching transmission channel on display device by different USB host devices |
-
2021
- 2021-11-08 CN CN202111312112.7A patent/CN114265803B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203552220U (en) * | 2013-11-13 | 2014-04-16 | Tcl集团股份有限公司 | Touch device of multiplex touch display screen |
| CN107239426A (en) * | 2017-06-08 | 2017-10-10 | 山东超越数控电子有限公司 | A kind of structure and method that DP inputs are realized by USB type C |
| CN111506532A (en) * | 2020-04-16 | 2020-08-07 | 深圳市颍创科技有限公司 | Method for fast switching transmission channel on display device by different USB host devices |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117971733A (en) * | 2024-03-29 | 2024-05-03 | 智道网联科技(北京)有限公司 | Touch circuit, vehicle-mounted device mainboard and touch circuit switching method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114265803B (en) | 2024-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3657778B1 (en) | Terminal device and control method therefor | |
| US11232057B2 (en) | Terminal device and control method thereof | |
| US7295194B2 (en) | Apparatus and method for outputting different display identification data depending on type of connector | |
| US7812832B2 (en) | Display capable of displaying images in response to signals of a plurality of signal formats | |
| US20060114248A1 (en) | Displaying apparatus and control method thereof | |
| CN210955043U (en) | DP supports HDMI interface hot plug circuit after converting into HDMI | |
| US20190064899A1 (en) | Electronic apparatus and cable | |
| CN107003968A (en) | Virtual monitor output port is configured | |
| CN104937947A (en) | Electronic apparatus, data block transmission method, transmission signal content determination method, and transceiver system | |
| CN109120973B (en) | Method, device and storage medium for rewriting EDID data | |
| CN103546741A (en) | Hot plugging detection method and device | |
| CN108024129A (en) | Display device and its mainboard | |
| CN108874713B (en) | Information processing method and device | |
| CN114265803A (en) | Method for multiplexing standard DP interface and supporting USB touch screen | |
| US20170116146A1 (en) | Control method and control device for a mobile terminal | |
| CN101873461A (en) | Image documentation equipment | |
| JP6907400B2 (en) | Image display device and image display method | |
| CN111886585B (en) | Terminal device, debugging card and debugging method | |
| CN113411531B (en) | Video transmission device | |
| EP4297414A1 (en) | Electronic device and operating method therefor | |
| CN105975414A (en) | Method and device for controlling mobile terminal | |
| GB2294135A (en) | Apparatus for adding display data channel to existing display | |
| KR100433873B1 (en) | Method And Apparatus for realizing Hot Plug Detection by using Digital Visual Interface | |
| CN101330587B (en) | Control method and circuit for television interface | |
| CN112333407A (en) | Video display capability compatibility method, port switching method and video matrix |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |