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A mhl cable and a virtual reality device

A cable and signal line technology, applied in the field of virtual reality equipment, can solve the problems of MHL cable EMI interference, EMI can not be suppressed, etc., to achieve the effect of reducing electromagnetic interference, reducing electromagnetic radiation interference, and enhancing effectiveness

Active Publication Date: 2019-06-04
BEIJING PICO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing signal transmission lines use conventional filtering methods such as magnetic rings to suppress EMI. However, since the MHL protocol specification defines that the clock signal adopts a common-mode signal transmission method, the common-mode signal is poorer than the common-mode signal and is more likely to cause EMI problems, and the magnetic ring cannot be used. and other conventional filtering methods to suppress EMI
Therefore, the problem of EMI interference in MHL cables needs to be solved urgently

Method used

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  • A mhl cable and a virtual reality device
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  • A mhl cable and a virtual reality device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 It is a schematic diagram of the structure of the MHL cable before improvement, figure 2 is a cross-sectional schematic diagram of the MHL cable before improvement; figure 1 and figure 2 , the signal transmission line of the existing virtual reality equipment needs a power supply and a video source respectively, so it often adopts a split structure, that is, an MHL cable is drawn from the interface P3 of the main board, and two cables are respectively connected to the end of the cable. There are two ports P1 and P2, where port P1 is connected to the power supply, and port P2 is connected to the video source.

[0028] see figure 2 , 21 represents the MHL signal ground wire, 22 represents the MHL+ / - differential signal wire, 23 represents the shielding layer, 24 represents the shielding layer, 25 represents the power control line VBUS, 26 represents the insulation layer, 27 represents the ground wire, 28 represents the D+ / of USB - The differential signal ...

Embodiment 2

[0034] Figure 4 It is a structural schematic diagram of an MHL cable according to another embodiment of the present invention. This embodiment mainly describes the overall structure of the MHL cable and the connection of the pins. For other content, refer to other embodiments of the present invention, which will not be repeated here. The following combination Figure 4 The structure of the MHL cable in this embodiment will be specifically described.

[0035] see Figure 4 The MHL cable provided by the present invention also includes three interfaces, wherein the first interface P1 is a power interface (such as a USB interface), the second interface P2 is an MHL interface, and the third interface P3 is a motherboard interface, which can be connected to On the motherboard of head-mounted display devices such as virtual reality devices. Depend on Figure 4 It can be seen in the figure that the power interface P1 includes four pins, which are power pins, a pair of USB differ...

Embodiment 3

[0041] Figure 5 is a schematic cross-sectional structure diagram of an MHL cable according to another embodiment of the present invention, Figure 6 It is a schematic diagram of the cross-sectional structure of the MHL signal line group of the MHL cable according to another embodiment of the present invention, Figure 7 It is a schematic diagram of the cross-sectional structure of the USB signal line group of the MHL cable according to another embodiment of the present invention. This embodiment mainly describes the wire groups included in the MHL cable. For other content, refer to other embodiments of the present invention, which will not be repeated here. The following combination Figure 5 to Figure 7 , the connection structure of the internal signal line groups of the MHL cable in this embodiment will be described in detail.

[0042] see Figure 5 , the MHL cable in this embodiment includes an MHL signal line set 501 and a USB signal line set 502 .

[0043] combine ...

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Abstract

The invention discloses an MHL (mobile high-definition link) cable. The MHL cable comprises an MHL signal wire group; the MHL signal wire group comprises an MHL signal ground wire and an MHL differential signal wire stranded with the MHL signal ground wire, wherein the exterior of the stranded MHL signal ground wire and the MHL differential signal wire is coated with a shield layer; and the shield layer is grounded independently. According to the MHL cable, the MHL signal ground wire and the MHL differential signal wire are shielded and grounded independently, so that the MHL signal ground wire and the MHL differential signal wire are isolated from a power supply ground wire and other ground wires in the MHL cable, the cleanliness of the MHL signal backflow ground, the completeness of the shielding and weaving for the MHL cable are ensured, and the electro magnetic radiation interference of the MHL is effectively lowered; the invention also provides virtual reality equipment; and the virtual reality equipment adopts the MHL cable, so that the electro magnetic interference of the virtual reality equipment is lowered also, and the product competitiveness of the virtual reality equipment is improved.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to an MHL cable and a virtual reality device. Background technique [0002] MHL (Mobile High-Definition Link) is an audio-visual standard interface for connecting portable consumer electronic devices, supporting uncompressed high-definition video and digital audio, charging and remote control operations. Because of its small number of pins, strong transmission data signal, space saving, and high transmission rate, it is more and more popular in VR (Virtual Reality). However, MHL only uses a pair of differential signal lines to transmit high-speed signals, and the amount of transmitted data is large. The requirements for preventing EMI (Electro Magnetic Interference) are very high, especially the longer the cable, the easier it is to introduce EMI problems. EMI is the electromagnetic wave radiated and leaked when cables transmit signals, which can cause a series of adverse consequenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B11/06H01B11/10
CPCH01B11/06H01B11/10
Inventor 邓雪冰葛祥军
Owner BEIJING PICO TECH
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