TWM641301U - Dual video specification display signal switching system - Google Patents

Abstract

A dual video specification display signal switching system is disclosed. The dual video specification display signal switching system includes a display connector, a display source and a switching module. The display connector electrically connected to a display and having an identification pin. The display source is electrically connected to the display connector and is configured to provide a first video specification display signal or a second video specification display signal. The switching module is electrically connected to the display connector and the display source respectively, and is configured to change according the voltage signal of the identification pin to switch the display signal of the first video specification display signal or the second video specification display signal to the display. Accordingly, the disclosed is able to switch between the DP video specification display signal and the HDMI video specification display signal, so as to improve the convenience of use of video hub.

Description

Dual video specification display signal switching system

This creation is about a display signal switching system, especially a dual video specification display signal switching system.

With the development of display technology, there are more and more specifications and types of signal connection interfaces. Currently, common signal connection interfaces include DisplayPort and High Definition Multimedia Interface (HDMI). The DP display interface has 20 pins, while the HDMI display interface has 19 pins. The two are quite similar, but there are still differences.

When developing and designing a video hub (video hub), since the DP video specification display signal and the HDMI video specification display signal have different definition pins, when the video expansion box needs to display the DP video specification display signal or the HDMI video specification display signal When presenting on a monitor, it is not possible to switch directly between the display signal of the DP video specification and the display signal of the HDMI video specification.

In view of the above known technologies, the creators developed a system that can switch between DP video standard display signals and HDMI video standard display signals, so as to improve the convenience of using the video signal expansion box.

In order to achieve the above purpose and other purposes, this creation system provides a dual-video specification display signal switching system, including: a display connector, which is used to electrically connect with a display, and has an identification pin; a display source, connected to the The display connector is electrically connected to provide a display signal of a first video specification or a display signal of a second video specification; Identify the change of the voltage signal of the pin, and switch the display signal of the first video specification or the display signal of the second video specification to the display.

In one embodiment, when the voltage signal of the identification pin is low, the switching module switches the display signal of the first video standard to the display.

In one embodiment, the first video standard display signal is a DP video standard display signal.

In one embodiment, the DP video standard display signal is transmitted to the display in an AC coupling manner.

In one embodiment, when the voltage signal of the identification pin is at high potential, the switching module switches the display signal of the second video standard to the display.

In one embodiment, the second video standard display signal is an HDMI video standard display signal.

In one embodiment, the HDMI video specification display signal is transmitted to the display in a DC coupling manner.

In one embodiment, it also includes an electronic switch module, which is electrically connected with the display connector, the display source and the switching module, and is used for displaying signals of the first video standard and the second video standard. Conduction path switching between signals.

In this way, the dual video specification display signal switching system of this creation can switch between the DP video specification display signal and the HDMI video specification display signal, so as to improve the convenience of using the video expansion box.

In order to fully understand the purpose, characteristics and effects of this creation, I will give a detailed description of this creation by using the following specific examples and accompanying drawings, as follows:

Please refer to Fig. 1, it is the system block diagram of the preferred embodiment of this creation. As shown in FIG. 1 , a display signal switching system 100 with dual video standards includes: a display connector 10 , a display source 20 and a switching module 30 . In some embodiments, the dual video specification display signal switching system 100 can be applied to a video extension box.

The display connector 10 is used to electrically connect with a display (not shown). The display can be, for example, a display with a display interface of a first video specification (eg, DP video specification) or a display interface with a second video specification (eg, HDMI video specification). The display connector 10 has an identification pin 10a, through the change of the voltage signal of the identification pin 10a, it can be identified whether the display interface with the first video standard or the display interface with the second video standard is electrically connected to the display connector 10 .

For example, it can be determined whether the display interface with the first video specification or the display interface with the second video specification is electrically connected to the display connector 10 through the normally open contact circuit or the normally closed contact circuit. For example, when the display interface of the first video standard is electrically connected to the display connector 10 , the normally closed contact circuit is opened (open), so that the identification pin 10 a is connected to the ground and presents a low potential (Low). This is defined as the first video standard display interface is 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 closed, so that the identification pin 10a is connected to a power source (for example, 3.3V) and presents a high potential (High) . This is defined as the second video standard display interface is electrically connected to the display connector 10 . In addition, the identification pin 10a may be the newly added 21st pin in the DP video standard display interface or the HDMI video standard display interface.

The display source 20 is electrically connected to the display connector 10 . The display source 20 is used for providing a display signal of a first video standard or a display signal of a second video standard.

The switching module 30 is electrically connected to the display connector 10 and the display source 20 respectively. The switching module 30 is used for switching the display signal of the first video standard or the display signal of the second video standard to the display according to the change of the voltage signal of the identification pin 10a. The switching module 30 can be composed of a logic switch circuit, for example, and switches the corresponding conduction path according to the voltage change of the identification pin 10a, so that the display connector 10 and the display source 20 form a signal docking relationship.

For example, when the first video standard 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 a low potential, and the display source 20 will send a display signal of the first video standard.

Since the switching module 30 recognizes that the voltage signal of the pin 10a is low, it turns on two signal channels (for example, DP_HPD and DP_TX2_AUX_C_P). At this time, the display signal of the first video standard sent by the display source 20 will be connected with the first video standard display (for example, a DP display) to output the first video standard display signal to the DP display.

When the second video standard display interface (for example, HDMI video standard display interface) is electrically connected to the display connector 10 , the identification pin 10 a is connected to a power source (for example, 3.3V). Therefore, the voltage signal identifying the pin 10a is high potential (High), and the display source 20 will send a second video standard display signal.

Since the switching module 30 recognizes that the voltage signal of the pin 10a is high, it turns on two signal channels (for example, HDMI_HPD and HDMI_TX2_SCL). At this time, the display signal of the second video standard sent by the display source 20 will be connected with the second video standard display (for example, an HDMI display) to output the second video standard display signal to the HDMI display.

The first voltage displacement unit 60 is electrically connected to the display connector 10 , the display source 20 and the switching module 30 respectively. The first voltage displacement unit 60 is used for converting the HDMI video standard display signal sent by the display source 20 into an appropriate voltage level.

The second voltage displacement unit 62 is electrically connected to the display connector 10 and the display source 20 respectively. The second voltage displacement unit 62 is used for converting the DP video standard 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 through the first voltage shift unit 60 and the second voltage shift unit 62 . If the display source 20 supports the voltage tolerance, the first voltage shift unit 60 and the second voltage shift unit 62 can be omitted.

The electronic switch module 70 is electrically connected to the display connector 10 , the display source 20 and the switching module 30 respectively. The electronic switch module 70 is used for switching the conduction path between the DP video standard display signal and the HDMI video standard display signal. In other words, the electronic switch module 70 is used to switch signal pins between two video standards.

Next, since there are differences in defined pins between the DP video standard and the HDMI video standard, the electronic switch module 70 is needed to switch the signal pins between the DP video standard and the HDMI video standard. For example, the difference between the signal pins (take pins 15 to 19) between the DP video specification and the HDMI video specification is as follows: Table 1: HDMI pin definition DP pin definition Pin 15 SCL Pin 15 AUX CH (p) Pin 16 SDA Pin 16 GND 17th pin DDC/CEC GROUND 17th pin AUX CH (n) Pin 18 +5V Power Pin 18 Hot Plug Detect Pin 19 Hot Plug Detect Pin 19 Return Table I

The electronic switch module 70 includes: a first switch unit 40, a second switch unit 42, a third switch unit 43, a fourth switch unit 44, a fifth switch unit 45, a first power switch unit 50 and a second power switch 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 respectively electrically connected to the identification pin 10 a. When the first switch unit 40 is turned on, the voltage signal identifying the pin 10 a can be transmitted to the second switch unit 42 and the fourth switch unit 44 .

In addition, 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 second switch unit is used as an example to illustrate the circuit. Connection relationship and action principle.

Please refer to FIG. 2 , which is a schematic circuit diagram of the second switch unit in a preferred embodiment of the 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. As shown in FIG. The first electronic switch Q1 , the second electronic switch Q2 and the third electronic switch Q3 may be, for example, NMOS field effect transistor switches.

The first terminal G (eg, gate) of the first electronic switch Q1 is electrically connected to the first switch unit 40 . The second terminal S (eg, source) of the first electronic switch Q1 is electrically connected to the ground. The third end D (for example, the drain) of the first electronic switch Q1 is electrically connected to the first end G (for example, the gate) of the second electronic switch Q2 and the first end G (for example, the gate) of the third electronic switch Q3 respectively. , gate).

The first end G (eg, gate) of the second electronic switch Q2 is electrically connected to one end of the resistor R, and the other end of the resistor R is electrically connected to the power supply P5V. The second terminal S (eg, source) of the second electronic switch Q2 is electrically connected to the ground. The third terminal D (for example, the drain) of the second electronic switch Q2 is electrically connected to the display connector 10 and the first voltage displacement unit 60 respectively.

The first terminal G (eg, gate) of the third electronic switch Q3 is electrically connected to the third terminal D (eg, drain) of the first electronic switch Q1 . The second terminal S (eg, source) of the third electronic switch Q3 is electrically connected to the ground. The third terminal D (for example, the drain) of the third electronic switch Q3 is electrically connected to the display connector 10 and the first voltage displacement unit 60 respectively.

For example, the DP video specification of the 16th pin is defined as SDA, and the HDMI video specification of the 16th pin is defined as GND. The third terminal D of the second electronic switch Q2 is electrically connected to the 16th 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. If the DP video specification is to be output, the second electronic switch Q2 is controlled to be turned on, so that the third electronic switch Q2 of the second electronic switch is turned on. Terminal D is electrically connected to ground.

The DP video specification of the 17th pin is defined as AUX CH (n), and the HDMI video specification of the 17th pin is defined as DDC/CEC GROUND. Therefore, the signal pins are switched through the third switch unit 43 . The DP video specification of the 18th pin is defined as HPD (Hot Plug Detect), and the HDMI video specification of the 18th pin is defined as +5V Power. Therefore, the signal pins are switched through the first power switch unit 50 . The DP video specification of the 19th pin is defined as Return, and the HDMI video specification of the 18th pin is defined as HPD. Therefore, the signal pins are switched through the fourth switch unit 44 . So on and so forth. In this way, the signal pin can be switched between the DP video standard and the HDMI video standard.

In addition, due to the difference in transmission speed between the DP video standard and the HDMI video standard, the DC-coupling transmission mode or the AC-coupling transmission mode can be switched synchronously through other logic circuits.

For example, when the voltage signal of the identification pin 10a is low, 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 high potential, the HDMI video standard display signal is controlled to be transmitted to the display in a DC coupling manner.

To sum up, since the dual-video specification display signal switching system of this creation recognizes the voltage signal changes of the pins, and cooperates with the switching module and the electronic switch module to switch the conduction path, it can be used in the DP video specification and the HDMI video specification. The display signal can be switched among them, thereby improving the convenience of using the video expansion box.

The invention has been disclosed above with a preferred embodiment, but those skilled in the art should understand that the embodiment is only used to describe the invention, and should not be construed as limiting the scope of the invention. It should be noted that all changes and replacements equivalent to the embodiments should be included in the scope of this creation. Therefore, the scope of protection of this creation should be defined by the scope of the patent application.

10:Display Connector 10a: Identify the foot position 20:Show source 30: switch module 40: The first switch unit 42: Second switch unit 43: The third switch unit 44: The fourth switch unit 45: Fifth switch unit 50: The first power switch unit 52: Second power switch unit 60: the first voltage displacement unit 62: the second voltage displacement unit 70:Electronic switch module 100: Dual video specification display signal switching system D: the third end G: first end Q1: The first electronic switch Q2: Second electronic switch Q3: The third electronic switch P5V: power supply R: resistance S: second end

[Fig. 1] is the system block diagram of the preferred embodiment of this creation. [Fig. 2] is a schematic circuit diagram of the second switch unit of the preferred embodiment of the invention.

10:Display Connector

10a: Identify the foot position

20:Show source

30: switch module

40: The first switch unit

42: Second switch unit

43: The third switch unit

44: The fourth switch unit

45: Fifth switch unit

50: The first power switch unit

52: Second power switch unit

60: the first voltage displacement unit

62: the second voltage displacement unit

70:Electronic switch module

100: Dual video specification display signal switching system

Claims (8)

A dual-video standard display signal switching system, comprising: A display connector, used for electrical connection with a display, and has an identification pin; a display source electrically connected to the display connector for providing a first video format display signal or a second video format display signal; and A switching module, electrically connected to the display connector and the display source, for switching the display signal of the first video standard or the display signal of the second video standard to the display signal according to the change of the voltage signal of the identification pin monitor. The dual-video format display signal switching system as described in Claim 1, wherein when the voltage signal of the identification pin is low, the switching module switches the first video format display signal to the display. The dual-video specification display signal switching system as described in claim 2, wherein the first video specification display signal is a DP video specification display signal. The dual-video specification display signal switching system as described in claim 3, wherein the DP video specification display signal is transmitted to the display in an AC coupling manner. The dual-video format display signal switching system as described in Claim 1, wherein when the voltage signal of the identification pin is at a high potential, the switching module switches the second video format display signal to the display. The dual video standard display signal switching system as described in claim 5, wherein the second video standard display signal is an HDMI video standard display signal. The dual-video standard display signal switching system as described in claim 6, wherein the HDMI video standard display signal is transmitted to the display in a DC coupling manner. The dual-video specification display signal switching system as described in claim 1, which also includes an electronic switch module, which is electrically connected to the display connector, the display source, and the switching module for use in the first video The conduction path switching between the specification display signal and the second video specification display signal.

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