WO2017206471A1

WO2017206471A1 - Signal conversion circuit, head-mounted display device, cable and virtual reality device

Info

Publication number: WO2017206471A1
Application number: PCT/CN2016/108944
Authority: WO
Inventors: 杨宇; 贺志军; 闫龙阁
Original assignee: 腾讯科技（深圳）有限公司
Priority date: 2016-06-02
Filing date: 2016-12-07
Publication date: 2017-12-07
Also published as: CN205845010U

Abstract

A signal conversion circuit (500), a head-mounted display device (10) using the signal conversion circuit (500) and a virtual reality device comprising the head-mounted display device (10). The signal conversion circuit (500) comprises: a signal interface (510) for receiving an HDMI signal or a DP signal; a switching control module (530) connected to the power supply terminal of the signal interface (510) for determining, according to a power supply input, whether an HDMI signal or a DP signal has been received and outputting a corresponding switching signal; a switching module (520) connected to the signal terminal of the signal interface (510) for outputting, according to the switching signal outputted by the switching control module (530), a DP signal from the DP signal output terminal of the switching module (520), or an HDMI signal from the HDMI signal output terminal thereof; and a DP signal module (540) connected to the switching module (520) for receiving the HDMI signal or DP signal, and after processing same, uniformly outputting a DP signal.

Description

Signal conversion circuit, head mounted display device, cable, and virtual reality device

Technical field

The utility model relates to the technical field of virtual reality devices, in particular to a signal conversion circuit, a head mounted display device, a cable and a virtual reality device.

Background technique

Virtual reality technology requires the support of virtual reality devices. An important component in virtual reality devices is the Head Mounted Display (HMD). The head-mounted display device processes the input video signal to two display screens in the helmet for display, and the left and right eyes of the user respectively view the contents of the two display screens to form 3D vision.

The current virtual reality device needs to achieve a very good display effect, and its display screen needs to support very high resolution and refresh frequency, such as a refresh rate of 120 Hz and a resolution of 2880×1440, so that the displayed image has a higher image. Sharpness, reduced tailing and flicker, so that users do not cause dizziness when used for a long time.

For this reason, the video transmission of the head mounted display device generally adopts HDMI (High Definition Media Interface). However, the traditionally used HDMI 1.4 interface theoretically supports up to 10.2 Gbps, which cannot meet the aforementioned high refresh rate and high resolution requirements. To this end, the head-mounted display device also partially adopts a DP interface, which can input higher-speed data. In addition, the HDMI 2.0 interface can also be used to meet the high input rate requirements.

The use of only the DP interface or the HDMI 2.0 interface will result in a wide adaptability of the head mounted display device. At the same time, the use of the two interfaces will result in the need to simultaneously design the connection positions of the two interfaces on the helmet, occupying a large space, which is not conducive to the use of the head mounted display device.

Summary of the invention

Based on this, it is necessary for the embodiment of the present invention to provide a signal conversion circuit that can input an HDMI signal or a DP signal from an interface and output it correctly after being discriminated.

In addition, an embodiment of the present invention also provides a head mounted display device using the signal conversion circuit. Therefore, the space occupied on the head mounted display device can be reduced.

In addition, an embodiment of the present invention also provides a virtual reality device including the head mounted display device.

A signal conversion circuit of an embodiment of the present invention includes:

a signal interface for receiving an HDMI signal or a DP signal;

The switching control module is connected to the power terminal of the signal interface, and is configured to determine whether the received HDMI signal or the DP signal is received according to the input power source, and output a corresponding switching signal;

The switching module is connected to the signal end of the signal interface, and outputs a DP signal from the DP signal output end of the switching module or an HDMI signal from the HDMI signal output end according to the switching signal output by the switching control module;

The DP signal module is connected to the switching module, receives the HDMI signal or the DP signal, and is processed to uniformly output the DP signal.

In one embodiment, the signal interface includes a connection end for transmitting 4 pairs of differential signals, an insertion detection signal, an auxiliary channel signal, a power signal, and a ground signal;

The power terminal is a connection end for transmitting the power signal and the ground signal; the signal end includes a connection end for transmitting the four pairs of differential signals, the insertion detection signal, and the auxiliary channel signal.

In one embodiment, the switching module includes a first switching unit, a second switching unit, and a switching control unit;

The first switching unit has a first input end, a first output end, and a second output end, and an input signal of the first input end can switch output between the first output end and the second output end; An input terminal is connected to the connection end of the signal interface for transmitting the four pairs of differential signals;

The second switching unit has a first input and output end, a second input and output end, a third input and output end, a second input end, a third input end, and a third output end, and the input and output of the first input and output end The signal can be switched between the second input and output terminals and the third input and output end, and the input signals of the second input end and the third input end are switchably input to the third output end; the first input and output end are connected to the a connection end of the signal interface for transmitting the auxiliary channel signal, wherein the third output end is connected to a connection end of the signal interface for transmitting the insertion detection signal;

The DP signal output end includes the first output end, the second input output end, and the second input end;

The HDMI signal output end includes the second output end, the third input output end, and the third input end;

The switching control unit receives the switching signal, and controls the first switching unit and the second switching unit to perform synchronous switching according to the switching signal.

In one embodiment, the switching control module includes a power detecting unit and a micro processing unit, wherein the power detecting unit is connected to a power terminal of the signal interface, detects a power voltage, and outputs a detection result signal; The input/output interface of the unit is connected to the power detecting unit to receive the detection result signal, and outputs a switching signal to the switching module according to the detection result signal.

A head-mounted display device according to an embodiment of the present invention includes a first display screen, a second display screen, a DP signal compression module, and the above-mentioned signal conversion circuit;

The DP signal compression module is connected to the signal conversion circuit, and performs compression processing on the DP signal acquired from the signal conversion circuit;

The first display screen and the second display screen are respectively connected to the DP signal compression module, and the corresponding video signals are acquired for display.

A virtual reality device according to an embodiment of the present invention, comprising the above-mentioned head mounted display device, further comprising a first cable and a second cable;

One end of the first cable has an interface matched with the signal interface, and the other end is an HDMI interface or a DP interface;

The two ends of the second cable are respectively an HDMI interface and a DP interface.

In one embodiment, the other end of the first cable is a male connector of the DP interface, and the two ends of the second cable are respectively an HDMI interface male and a DP interface female.

In one embodiment, the other end of the first cable is a male end of the HDMI interface, and the two ends of the second cable are respectively an HDMI interface female and a DP interface male.

A cable for connecting the signal conversion circuit of the above embodiment, wherein one end of the cable has an interface matched with the signal interface, and the other end is an HDMI interface or a DP interface.

In one of the embodiments, the HDMI interface or the DP interface is a male.

A head-mounted display device according to an embodiment of the present invention, the head-mounted display device includes: the signal conversion circuit, the video signal processing circuit, the first display screen and the second display screen;

The signal conversion circuit is configured to input an HDMI signal or a DP signal from the same signal interface, output after being discriminated, and the HDMI signal or the DP signal is sent to the video signal processing circuit;

The video signal processing circuit is configured to send the received HDMI signal or the DP signal to the first display screen and the second display screen for display.

The above-mentioned head-mounted display device and virtual reality device can support the HDMI signal and the DP signal input hardware structure based on the signal conversion circuit, thereby satisfying the transmission of the higher bandwidth data and providing a better display effect for the virtual reality display. Give users a better experience. At the same time, since only one signal interface can be used to input HDMI signals or DP signals, it is not only suitable for wider applications, but also does not occupy extra space on the helmet.

The cable can assist in transmitting data from the signal interface of the signal conversion circuit.

DRAWINGS

1 is a schematic structural view of a head mounted display device according to an embodiment;

2 is a schematic block diagram showing the circuit structure of the head mounted display device shown in FIG. 1;

Figure 3 illustrates one of the implementations of Figure 2;

4 is a schematic view of a connection cable.

detailed description

Further description will be made below with reference to the accompanying drawings and embodiments.

FIG. 1 is a schematic structural view of a head mounted display device of an embodiment. The head mounted display device 10 includes a helmet body 100. The helmet body 100 is generally generally an inner hollow square structure, one side of the square is open, and the opposite side of the opening is provided with two display screens (a first display screen 210 and a second display screen 220). A fastening strap 300 is disposed at both ends of the helmet body 100 for assisting in fixing the helmet to the user's head. When the user is in use, the eye position is aligned with the opening to bring the helmet on, so that the left and right eyes can respectively view the two display screens, and then the fastening buckle 300 is used to assist the fastening. It is to be understood that the structure of the head mounted display device 10 is not limited to the above, as long as it is convenient to wear and is suitable for placing two display screens.

In addition, a signal interface 400 is also required at the appropriate location of the helmet body 100 for transmitting video signals.

2 is a schematic block diagram showing the circuit configuration of the head mounted display device shown in FIG. 1. The circuit configuration of the head mounted display device 10 includes a signal conversion circuit 500 and a video signal processing circuit 600. The signal conversion circuit 500 inputs an HDMI signal or a DP signal from the same signal interface, and outputs the HDMI signal or the DP signal to the video signal processing circuit 600 after the discrimination process. The video signal processing circuit 600 processes the received HDMI signal or DP signal and sends them to the first display 210 and the second display 220 for display.

Referring to FIG. 3, it is one of the specific implementation manners of the schematic block diagram shown in FIG. 2.

A signal conversion circuit 500 includes a signal interface 510, a switching module 520, a switching control module 530, and a DP signal module 540.

The signal interface 510 is for receiving an HDMI signal or a DP signal. The signal interface 510 includes four pairs of differential signals (DCx(p), DCx(n)), an insertion detection signal (HPDC), an auxiliary channel signal (DDC/AUX), a power signal (VCC), and a ground signal (GND). The connection end. The connection end of the signal interface 510 for transmitting the power signal (VCC) and the ground signal (GND) is a power terminal. The connection terminals in the signal interface 510 for transmitting the four pairs of differential signals (DCx(p), DCx(n)), the insertion detection signal (HPDC), and the auxiliary channel signal (DDC/AUX) are collectively referred to as signal terminals. .

The switching control module 530 is connected to the power terminal of the signal interface 510 for determining whether the received HDMI signal or the DP signal is received according to the input power source, and outputs a corresponding switching signal.

The switching module 520 is connected to the signal end of the signal interface 510, and outputs a DP signal from the DP signal output end of the switching module 520 or an HDMI signal from the HDMI signal output end according to the switching signal output by the switching control module 530.

Specifically, the switching module 520 includes a first switching unit 521, a second switching unit 522, and a switching control unit 523.

The first switching unit 521 has a first input terminal I1, a first output terminal O1, and a second output terminal O2, and the input signal of the first input terminal I1 can be between the first output terminal O1 and the second output terminal O2. Switch the output. The first input terminal I1 is connected to a connection terminal in the signal interface 510 for transmitting the four pairs of differential signals (DCx(p), DCx(n)). Therefore, the first switching unit 521 can output 4 pairs of differential signals (DCx(p), DCx(n)) from the first output terminal O1 as differential signals (DAx(p), DAx(n)), or switch to slave signals. The second output terminal O2 outputs a differential signal (DBx(p), DBx(n)).

The second switching unit 522 has a first input/output terminal I/O1 and a second input/output terminal. I/O2, third input/output terminal I/O3, second input terminal I2, third input terminal I3, and third output terminal O3. The input and output signals of the first input/output terminal I/O1 are switchable between the second input/output terminal I/O2 and the third input/output terminal I/O3, and the second input terminal I2 and the third input terminal I3 The input signal is switchably input to the third output terminal O3; the first input/output terminal I/O1 is connected to a connection terminal in the signal interface for transmitting the auxiliary channel signal (DDC/AUX), A three output terminal O3 is coupled to the connection terminal in the signal interface for transmitting the insertion detection signal (HPDC).

The DP signal output terminal includes the first output terminal O1, the second input/output terminal I/O2, and the second input terminal I2.

The HDMI signal output terminal includes the second output terminal O2, the third input/output terminal I/O3, and the third input terminal I3.

The switching control unit 523 receives the switching signals (AUX SEL, Dx SEL), and controls the first switching unit 521 and the second switching unit 522 to perform synchronous switching according to the switching signal.

The reason why the DP signal or the HDMI signal can be transmitted using the same signal interface is based on the similarity in the transmission structure of the signal lines. Refer to Table 1 below.

Table 1

The structure of this embodiment is based on this, and the same signal interface 510 is used to transmit the HDMI signal or the DP signal, thereby achieving the purpose of saving space on the head mounted display device. At the same time, in conjunction with the detection of the power supply voltage of the input signal by the switching control module 530, it is possible to distinguish whether the input is an HDMI signal or a DP signal, and then the control switching module 520 outputs the input signal from the corresponding HDMI signal output terminal or the DP signal output terminal. .

Specifically, the handover control module 530 includes a power detection unit 531 and a micro processing unit (MCU) 532. The power detecting unit 531 is connected to a power terminal (including a connection end of the transmission power signal VCC and the ground signal GND) in the signal interface 510, detects a power source voltage, and outputs a detection result signal. The input/output interface of the MCU 532 is connected to the power detecting unit 531 to receive the detection result signal, and outputs a switching signal to the switching module 520 according to the detection result signal.

The DP signal module 540 uniformly outputs a DP signal. When the switching module 520 provides the DP signal, the DP signal module 540 can directly forward. When the switching module 520 provides an HDMI signal, the DP signal module 540 converts the HDMI signal into a DP signal. Referring to FIG. 3, video signal processing circuit 600 includes a DP signal compression module 610.

The signal conversion circuit 500 is coupled to the DP signal compression module 610 to provide a DP signal to the DP signal compression module 610.

The DP signal compression module 610 is connected to the signal conversion circuit 500, and performs compression processing on the DP signal acquired from the signal conversion circuit 500. Typically, the DP signal is compressed to a MIPI signal in a 2:1 ratio. The first display screen 210 and the second display screen 220 are respectively connected to the DP signal compression module 610 to acquire a corresponding video signal for display.

In one embodiment, the resolution of the head mounted display device may be 1920×1080@90 Hz. For this application, the amount of payload data is: 1920×1080×90×24 (color depth)= 4.48Gbps, the theoretical bandwidth required is: 4.48Gbps * 1.25 = 5.6Gbps.

If you need to improve the VR experience, improve the trailing and flickering of the display, and avoid the dizziness caused by long-time wear, it is necessary to adopt higher resolution and higher refresh rate. For example, 2880×1440@120Hz, the payload data volume of this configuration is: 2880×1440×120×24 (color depth)=11.95 Gbps, and the required theoretical bandwidth is: 11.95 Gbps*1.25=14.93 Gbps.

Currently, configurations that meet the above requirements are DP 1.2 (21.6 Gbps) and HDMI 2.0 (18 Gbps).

The head-mounted display device of the above embodiment supports both the HDMI signal and the DP signal input, thereby satisfying the transmission of higher bandwidth data, providing a better display effect for the virtual reality display, and enabling the user to obtain a better use experience. At the same time, since only one signal interface can be used to input HDMI signals or DP signals, it is not only suitable for wider applications, but also does not occupy extra space on the helmet.

Based on the above-described head mounted display device, a complete virtual reality device can be realized. The virtual reality device includes, in addition to the head mounted display device of the above embodiment, an external signal source, a connection cable connecting the external signal source and the head mounted display device, and the like.

As shown in FIG. 4, the connection cable 20 may include a first cable 201 and a second cable 202. The first cable 201 has an interface 203 matching the signal interface 510 at one end and a DP interface (male of a standard or mini DP connector) 204 at the other end. The two ends of the second cable 202 are respectively an HDMI interface (male of the HDMI connector) 205 and a DP interface (female of the standard or mini DP connector) 206.

Referring to FIG. 1, when the input of the DP signal is required, only the interface 203 of the first cable 201 needs to be connected to the signal interface 510, and then the DP interface 204 of the other end of the first cable 201 is connected to the signal source. When the HDMI signal needs to be input, the interface 203 of the first cable 201 is first connected to the signal interface 510, and then the DP interface 204 of the other end of the first cable 201 is connected to the DP interface 206 of the second cable 202. Finally, The HDMI interface 205 of the second cable 202 is Signal source connection.

It can be understood that the other end of the first cable 201 can also be a male end of the HDMI interface, and the two ends of the second cable are respectively an HDMI interface female head and a DP interface male head.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the utility model. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Industrial applicability

According to the embodiment of the present invention, the signal conversion circuit can simultaneously support the hardware structure of the HDMI signal and the DP signal input, thereby satisfying the transmission of the higher bandwidth data, providing a better display effect for the virtual reality display, and enabling the user to obtain more. Good use experience. At the same time, since only one signal interface can be used to input HDMI signals or DP signals, it is not only suitable for wider applications, but also does not occupy extra space on the helmet.

Claims

A signal conversion circuit comprising:

a signal interface for receiving an HDMI signal or a DP signal;

The switching control module is connected to the power terminal of the signal interface, and is configured to determine, according to the input power source, that the received HDMI signal or the DP signal is, and output a corresponding switching signal;

The switching module is connected to the signal end of the signal interface, and outputs a DP signal from the DP signal output end of the switching module or an HDMI signal from the HDMI signal output end according to the switching signal output by the switching control module;

The DP signal module is connected to the switching module, receives the HDMI signal or the DP signal, and is processed to uniformly output the DP signal.
The signal conversion circuit according to claim 1, wherein said signal interface comprises a connection terminal for transmitting four pairs of differential signals, an insertion detection signal, an auxiliary channel signal, a power supply signal, and a ground signal;

The power terminal is a connection end for transmitting the power signal and the ground signal; the signal end includes a connection end for transmitting the four pairs of differential signals, the insertion detection signal, and the auxiliary channel signal.
The signal conversion circuit according to claim 2, wherein the switching module comprises a first switching unit, a second switching unit, and a switching control unit;

The first switching unit has a first input end, a first output end, and a second output end, and an input signal of the first input end can switch output between the first output end and the second output end; the first input Connecting to the connection end of the signal interface for transmitting the four pairs of differential signals;

The second switching unit has a first input and output end, a second input and output end, a third input and output end, a second input end, a third input end, and a third output end, and the input and output of the first input and output end The signal can be switched between the second input and output ends and the third input and output end, and the input signals of the second input end and the third input end are switchable input to the third output end; The input and output end is connected to a connection end of the signal interface for transmitting the auxiliary channel signal, and the third output end is connected to a connection end of the signal interface for transmitting the insertion detection signal;

The DP signal output end includes the first output end, the second input output end, and the second input end;

The HDMI signal output end includes the second output end, the third input output end, and the third input end;

The switching control unit receives the switching signal, and controls the first switching unit and the second switching unit to perform synchronous switching according to the switching signal.
The signal conversion circuit according to claim 1, wherein said switching control module comprises a power detecting unit and a micro processing unit, said power detecting unit being connected to a power terminal of said signal interface, detecting a power supply voltage, and outputting a detection result a signal; an input/output interface of the micro processing unit is connected to the power detecting unit to receive the detection result signal, and output the switching signal to the switching module according to the detection result signal.
A head mounted display device comprising a first display screen, a second display screen, a DP signal compression module, and the signal conversion circuit according to any one of claims 1 to 4;

The DP signal compression module is connected to the signal conversion circuit, and performs compression processing on the DP signal acquired from the signal conversion circuit;

The first display screen and the second display screen are respectively connected to the DP signal compression module, and the corresponding video signals are acquired for display.
A virtual reality device, comprising the head mounted display device of claim 5, further comprising a first cable and a second cable;

One end of the first cable has an interface matched with the signal interface, and the other end is an HDMI interface or a DP interface;

The two ends of the second cable are respectively an HDMI interface and a DP interface.
The virtual reality device of claim 6, wherein the other end of the first cable is a male of the DP interface, and the two ends of the second cable are an HDMI interface male and a DP interface female, respectively.
The virtual reality device of claim 6, wherein the other end of the first cable is a male end of the HDMI interface, and the two ends of the second cable are respectively an HDMI interface female and a DP interface male.
A cable for connecting a signal interface of the signal conversion circuit according to any one of claims 1 to 4, wherein one end of the cable has an interface matching the signal interface, and the other end is an HDMI interface or a DP interface.
The cable of claim 9, wherein the HDMI interface or the DP interface is a male connector.
A head mounted display device, comprising: the signal conversion circuit according to any one of claims 1 to 4, a video signal processing circuit, a first display screen and a second display screen;

The signal conversion circuit is configured to input an HDMI signal or a DP signal from the same signal interface, output after being discriminated, and the HDMI signal or the DP signal is sent to the video signal processing circuit;

The video signal processing circuit is configured to send the received HDMI signal or the DP signal to the first display screen and the second display screen for display.