CN218648857U - Dual-video specification display signal switching system - Google Patents
Dual-video specification display signal switching system Download PDFInfo
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- CN218648857U CN218648857U CN202223290292.6U CN202223290292U CN218648857U CN 218648857 U CN218648857 U CN 218648857U CN 202223290292 U CN202223290292 U CN 202223290292U CN 218648857 U CN218648857 U CN 218648857U
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- display
- video specification
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- video
- display signal
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Abstract
The utility model provides a two video specification display signal switched systems contains: the display connector is electrically connected with the display and is provided with an identification pin; the display source is electrically connected with the display connector and used for providing a first video specification display signal or a second video specification display signal; and the switching module is electrically connected with the display connector and the display source respectively and used for switching the first video specification display signal or the second video specification display signal to the display according to the change of the voltage signal of the identification pin. Therefore, the utility model discloses a two video specification display signal switched systems can switch between DP video specification display signal and HDMI video specification display signal to promote the convenience of use of video extension box.
Description
Technical Field
The utility model relates to a show signal switching system, especially relate to a two video specification show signal switching system.
Background
With the development of display technology, the specifications and types of signal connection interfaces are increasing, and currently, common signal connection interfaces include a display port Interface (DisplayPort) and a High Definition Multimedia Interface (HDMI). The DP display interface has 20 pins, while the HDMI display interface has 19 pins, which are similar but different.
SUMMERY OF THE UTILITY MODEL
When a video expansion box (video hub) is designed, because the DP video specification display signal and the HDMI video specification display signal have different definition pins, when the video expansion box is to display the DP video specification display signal or the HDMI video specification display signal on a display, it is not possible to directly switch between the DP video specification display signal and the HDMI video specification display signal.
In view of the above-mentioned prior art, the utility model discloses the people develop one kind and can carry out the system that switches between DP video specification display signal and HDMI video specification display signal to promote the convenience of use of video extension box.
To achieve the above and other objects, the present invention provides a dual video format display signal switching system, comprising: the display connector is electrically connected with the display and is provided with an identification pin; the display source is electrically connected with the display connector and used for providing a first video specification display signal or a second video specification display signal; and the switching module is respectively electrically connected with the display connector and the display source and used for switching the display signal of the first video specification or the display signal of the second video specification to the display according to the change of the voltage signal of the identification pin.
In an embodiment, when the voltage signal of the identification pin is at a low voltage level, the switching module switches the first video specification display signal to the display.
In an embodiment, the first video specification display signal is a DP video specification display signal.
In one embodiment, the DP video specification display signal is transmitted to the display in an ac-coupled manner.
In an embodiment, when the voltage signal of the identification pin is a high level, the switching module switches the second video specification display signal to the display.
In an embodiment, the second video specification display signal is an HDMI video specification display signal.
In one embodiment, the HDMI video format display signal is transmitted to the display device by dc coupling.
In an embodiment, the display device further includes an electronic switch module electrically connected to the display connector, the display source and the switching module, respectively, for switching a conduction path between the first video specification display signal and the second video specification display signal.
Therefore, the utility model discloses a two video specification display signal switched systems can switch between DP video specification display signal and HDMI video specification display signal to promote the convenience of use of video extension box.
Drawings
FIG. 1 is a system block diagram of a preferred embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a second switch unit according to a preferred embodiment of the present invention.
Reference numerals
10. Display connector
10a identification pin
20. Display source
30. Switching module
40. First switch unit
42. Second switch unit
43. Third switch unit
44. Fourth switch unit
45. Fifth switch unit
50. First power switch unit
52. Second power switch unit
60. First voltage displacement unit
62. Second voltage displacement unit
70. Electronic switch module
100. Dual video specification display signal switching system
D third end
G first end
Q1 first electronic switch
Q2 second electronic switch
Q3 third electronic switch
P5V power supply
R resistance
S second terminal
Detailed Description
The following description is given for the purpose of illustrating the embodiments of the present invention by way of specific examples, and other advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention. The present invention may be practiced or carried out in other different specific embodiments, and various modifications and changes may be made in the details of this description without departing from the spirit or scope of the present invention.
Referring to fig. 1, a system block diagram of a preferred embodiment of the present invention is shown. As shown in fig. 1, the dual video format display signal switching system 100 includes: display connector 10, display source 20 and switching module 30. In some embodiments, the dual video format display signal switching system 100 can be applied to a video expansion box.
The display connector 10 is used for electrically connecting with a display (not shown). The display may be, for example, a display having a first video specification (e.g., the DP video specification) display interface or a display having a second video specification (e.g., the HDMI video specification) display interface. The display connector 10 has an identification pin 10a, and identifies whether the first video specification display interface or the second video specification display interface is electrically connected to the display connector 10 by the change of the voltage signal of the identification pin 10a.
For example, it can be determined whether the first video specification display interface or the second video specification display interface is electrically connected to the display connector 10 through the normally open contact circuit or the normally closed contact circuit. For example, when the first video specification display interface is electrically connected to the display connector 10, the normally closed contact circuit is opened (open), so that the identification pin 10a is connected to the ground and exhibits a Low voltage (Low). Thereby defining a first video specification display interface electrically connected to the display connector 10.
When the display interface of the second video specification is electrically connected to the display connector 10, the normally open contact circuit is connected (close), so that the identification pin 10a is connected to a power supply (e.g., 3.3V) and exhibits a High voltage (High). Thereby defining a second video specification display interface electrically connected to the display connector 10. In addition, the identification pin 10a can be a 21 st pin added to a DP video standard display interface or an HDMI video standard display interface.
The display source 20 is electrically connected to the display connector 10. The display source 20 is configured to provide a first video specification display signal or a second video specification display signal.
The switching module 30 is electrically connected to the display connector 10 and the display source 20, respectively. The switching module 30 is configured to switch the first video specification display signal or the second video specification display signal to the display according to the change of the voltage signal of the identification pin 10a. The switching module 30 may be, for example, composed of a logic switch circuit, and switches the corresponding conducting path according to the voltage variation of the identification pin 10a, so as to make the display connector 10 and the display source 20 form a signal interfacing relationship.
For example, when the first video specification display interface is electrically connected to the display connector 10, the identification pin 10a is connected to the ground. Therefore, the voltage signal of the identification pin 10a is at a low voltage level, and the display source 20 sends out the display signal of the first video specification.
The switch module 30 recognizes that the voltage signal of the pin 10a is low, and therefore, two signal paths (for example, DP _ HPD and DP _ TX2_ AUX _ C _ P) are turned on. At this time, the display source 20 sends the first video format display signal to interface with the first video format display (for example, DP display) to output the first video format display signal to the DP display.
When the second video specification display interface (e.g., HDMI video specification display interface) is electrically connected to the display connector 10, the identification pin 10a is connected to a power source (e.g., 3.3V). Therefore, the voltage signal of the identification pin 10a is at a High potential (High), and the display source 20 sends out the display signal of the second video format.
The switch module 30 turns on two signal channels (e.g., HDMI _ HPD and HDMI _ TX2_ SCL) because the voltage signal of the identification pin 10a is high. At this time, the display source 20 sends the second video specification display signal to interface with a second video specification display (e.g., an HDMI display) to output the second video specification display signal to the HDMI display.
The first voltage shifting unit 60 is electrically connected to the display connector 10, the display source 20 and the switching module 30, respectively. The first voltage shifting unit 60 is used to convert the HDMI video standard display signal sent by the display source 20 into an appropriate voltage level.
The second voltage shifting unit 62 is electrically connected to the display connector 10 and the display source 20, respectively. The second voltage shifting unit 62 is used to convert the DP video format display signal sent by the display source 20 into an appropriate voltage level.
For example, if the display source 20 does not support the voltage tolerance, the display signal sent by the display source 20 needs to be converted into an appropriate voltage level by the first voltage shifting unit 60 and the second voltage shifting unit 62. If the display source 20 supports the voltage tolerance, the first voltage shifting unit 60 and the second voltage shifting unit 62 can be omitted.
The electronic switch module 70 is electrically connected to the display connector 10, the display source 20 and the switch module 30, respectively. The electronic switch module 70 is used for switching a conduction path between the DP video format display signal and the HDMI video format display signal. In other words, the electronic switch module 70 is used to switch the signal pins between two video specifications.
Next, since there is a difference between the DP video specification and the HDMI video specification in defining the pin, the electronic switch module 70 is required to switch the signal pin between the DP video specification and the HDMI video specification. For example, the difference between the signal pins in the DP video specification and the HDMI video specification (for example, pins 15 to 19) is as follows:
| HDMI pin | Definition of | DP Pin | Definition of |
| No. 15 pin | SCL | No. 15 pin | AUX CH(p) |
| No. 16 pin | SDA | No. 16 pin | GND |
| No. 17 pin | DDC/CEC GROUND | No. 17 pin | AUX CH(n) |
| 18 th pin | +5V Power | 18 th pin | Hot Plug Detect |
| 19 th pin | Hot Plug Detect | 19 th pin | Return |
Watch 1
The electronic switch module 70 includes: a first switching unit 40, a second switching unit 42, a third switching unit 43, a fourth switching unit 44, a fifth switching unit 45, a first power switching unit 50, and a second power switching unit 52.
The first switch unit 40, the third switch unit 43, the fifth switch unit 45 and the first power switch unit 50 are electrically connected to the identification pin 10a, respectively. When the first switch unit 40 is turned on, the voltage signal of the identification pin 10a can be transmitted to the second switch unit 42 and the fourth switch unit 44.
The first switch unit 40, the second switch unit 42, the third switch unit 43, the fourth switch unit 44 and the fifth switch unit 45 have the same or similar circuit structures, and the circuit connection relationship and the operation principle will be described below by taking the second switch unit as an example.
Fig. 2 is a schematic circuit diagram of a second switch unit according to a preferred embodiment of the present invention. As shown in fig. 2, the second switch unit 42 includes a first electronic switch Q1, a second electronic switch Q2, a third electronic switch Q3 and a resistor R. The first electronic switch Q1, the second electronic switch Q2 and the third electronic switch Q3 may be NMOS field effect transistor switches, for example.
The first terminal G (e.g., gate) of the first electronic switch Q1 is electrically connected to the first switch unit 40. The second terminal S (e.g., source) of the first electronic switch Q1 is electrically connected to ground. The third terminal D (e.g., drain) of the first electronic switch Q1 is electrically connected to the first terminal G (e.g., gate) of the second electronic switch Q2 and the first terminal G (e.g., gate) of the third electronic switch Q3, respectively.
A first terminal G (e.g., a gate) of the second electronic switch Q2 is electrically connected to one terminal of the resistor R, and the other terminal of the resistor R is electrically connected to the power source P5V. The second terminal S (e.g., source) of the second electronic switch Q2 is electrically connected to ground. The third terminal D (e.g., drain) of the second electronic switch Q2 is electrically connected to the display connector 10 and the first voltage shifting unit 60, respectively.
The first terminal G (e.g., gate) of the third electronic switch Q3 is electrically connected to the third terminal D (e.g., drain) of the first electronic switch Q1. The second terminal S (e.g., source) of the third electronic switch Q3 is electrically connected to ground. The third terminal D (e.g., drain) of the third electronic switch Q3 is electrically connected to the display connector 10 and the first voltage shifting unit 60, respectively.
For example, the DP video specification of the 16 th pin is defined as SDA, and the HDMI video specification of the 16 th pin is defined as GND. The third terminal D of the second electronic switch Q2 is electrically connected to the 16 th pin of the display connector 10.
When the first switch unit 40 is turned on, the voltage signal of the identification pin 10a can be transmitted to the second switch unit 42, and if the DP video specification is to be output, the second electronic switch Q2 is controlled to be turned on, so that the third terminal D of the second electronic switch Q2 is electrically connected to the ground.
The DP video specification of the 17 th pin is defined as AUX CH (n), and the HDMI video specification of the 17 th pin is defined as DDC/CEC GROUND. Therefore, the switching of the signal pin is performed by the third switching unit 43. The DP video specification of the 18 th pin is defined as HPD (Hot Plug Detect), and the HDMI video specification of the 18 th pin is defined as +5V Power. Therefore, the switching of the signal pin is performed by the first power switching unit 50. The DP video specification of pin 19 is defined as Return, and the HDMI video specification of pin 18 is defined as HPD. Therefore, the switching of the signal pin is performed by the fourth switching unit 44. And so on. Therefore, the signal pin can be switched between the DP video specification and the HDMI video specification.
In addition, since the DP video standard and the HDMI video standard have a difference in transmission speed, switching between a direct current coupling (DC-coupling) transmission method and an alternating current coupling (AC-coupling) transmission method can be performed in synchronization by using another logic circuit.
For example, when the voltage signal of the identification pin 10a is at a low voltage level, the DP video specification display signal is controlled to be transmitted to the display in an ac coupling manner. When the voltage signal of the identification pin 10a is at a high level, the HDMI video display signal is controlled to be transmitted to the display in a dc coupling manner.
In conclusion, because the utility model discloses a two video specification display signal switching system borrows by the voltage signal change of discernment pin, and collocation switching module and electronic switch module carry out the switching of conduction path to show the switching of signal between DP video specification and HDMI video specification, and then promote the convenience of use of video extension box.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.
Claims (8)
1. A dual video format display signal switching system, comprising:
the display connector is electrically connected with the display and is provided with an identification pin;
the display source is electrically connected to the display connector and used for providing a first video specification display signal or a second video specification display signal; and
and the switching module is electrically connected with the display connector and the display source respectively and used for switching the first video specification display signal or the second video specification display signal to the display according to the change of the voltage signal of the identification pin.
2. The system according to claim 1, wherein the switching module switches the first video specification display signal to the display when the voltage signal of the identification pin is low.
3. The dual video specification display signal switching system of claim 2, wherein the first video specification display signal is a DP video specification display signal.
4. The system according to claim 3, wherein the DP video format display signal is transmitted to the display device via AC coupling.
5. The system of claim 1, wherein the switching module switches the second video format display signal to the display when the voltage signal of the identification pin is high.
6. The dual video specification display signal switching system according to claim 5, wherein the second video specification display signal is an HDMI video specification display signal.
7. The dual video specification display signal switching system according to claim 6, wherein the HDMI video specification display signal is transmitted to the display by DC coupling.
8. The dual-video format display signal switching system of claim 1, further comprising an electronic switch module electrically connected to the display connector, the display source and the switching module, respectively, for switching a conduction path between the first video format display signal and the second video format display signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223290292.6U CN218648857U (en) | 2022-12-08 | 2022-12-08 | Dual-video specification display signal switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223290292.6U CN218648857U (en) | 2022-12-08 | 2022-12-08 | Dual-video specification display signal switching system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218648857U true CN218648857U (en) | 2023-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223290292.6U Active CN218648857U (en) | 2022-12-08 | 2022-12-08 | Dual-video specification display signal switching system |
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| Country | Link |
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| CN (1) | CN218648857U (en) |
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- 2022-12-08 CN CN202223290292.6U patent/CN218648857U/en active Active
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