All-optical transmission assembly of HDMI (High Definition Multimedia Interface)

Abstract

The utility model discloses an HDMI all-optical transmission assembly, which comprises a transmission cable, a transmitting module and a receiving module, the transmission cable comprises a plurality of optical fibers, the transmitting module is arranged at a first end of the transmission cable, the receiving module is arranged at a second end of the transmission cable, and the receiving module comprises a boost submodule. The boost submodule is used for sensing the light emitted by the emission module and converting the light into a + 5V electric signal which is used as excitation voltage of hot plugging. According to the HDMI transmission assembly, the boost sub-module is arranged, so that all-optical transmission can be realized without adopting a hybrid cable or additionally arranging equipment such as a USB plug, and the structure of the HDMI transmission assembly is effectively simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of data transmission, in particular to an HDMI full-optical transmission component. Background Art

[0002] High Definition Multimedia Interface (HDMI) is a digital video / audio interface technology, a dedicated digital interface suitable for image transmission, which can transmit image and audio signals simultaneously.

[0003] Traditional HDMI cables mostly use copper core cables. However, due to the limitations of its material properties, copper core HDMI cables become more and more attenuated as the data transmission rate increases, and the transmission distance becomes shorter and shorter. At the same time, they are susceptible to external electromagnetic interference, making it difficult to ensure high signal fidelity. This may cause problems such as screen flickering and noise on the display, affecting the audio-visual effect. It is difficult to meet many high-definition, long-distance transmission and other usage requirements.

[0004] To improve transmission speed, distance, and quality, some HDMI transmission components are now using optical cables instead of copper cables. However, according to the HDMI protocol, the HDMI interface includes a +5V electrical signal line, and the +5V electrical signal is used to trigger a hot-plug detection signal. Because optical fiber is typically made of glass fiber, which is an electrical insulator, it cannot support PoE power supply, that is, it cannot support the transmission of the +5V electrical signal. This means that existing HDMI components that use optical transmission still need to retain at least one copper cable, or need to be equipped with an additional USB plug to generate a +5V electrical signal, or an external 5V power supply as the excitation voltage for hot plugging. Utility Model Content

[0005] In order to solve some or all of the problems in the prior art, the present invention provides an all-optical transmission component for HDMI, which includes:

[0006] a transmission cable comprising a plurality of optical fibers;

[0007] a transmitting module, which is disposed at the first end of the transmission cable; and

[0008] A receiving module is provided at the second end of the transmission cable. The receiving module includes a boost submodule. The boost submodule is used to sense the light emitted by the transmitting module and convert the light into a +5V electrical signal.

[0009] Furthermore, the boost submodule includes:

[0010] a photoelectric conversion circuit, configured to convert the light emitted by the emission module into a first DC voltage; and

[0011] A boost circuit is used to convert the first DC voltage into a +5V electrical signal.

[0012] Furthermore, the photoelectric conversion circuit includes a capacitor and / or a photoresistor, and the capacitor and / or the photoresistor are used to sense the light emitted by the emitting end and convert it into an electrical signal.

[0013] Furthermore, the boost circuit includes a switching DC-DC boost circuit.

[0014] Furthermore, the transmitting module includes:

[0015] Gold fingers, which are used to transmit electrical signals; and

[0016] The electro-optical conversion submodule is used to convert electrical signals into optical signals and send them to the transmission cable.

[0017] Furthermore, the electro-optical conversion submodule includes a driver chip and a laser.

[0018] Furthermore, the electro-optical conversion submodule further includes a first encoder, which is used to encode or parse the low-speed signal to support optical fiber transmission.

[0019] Furthermore, the receiving module includes:

[0020] Gold fingers, which are used to transmit electrical signals; and

[0021] The photoelectric conversion submodule is used to convert the optical signal received from the transmission cable into an electrical signal.

[0022] Furthermore, the photoelectric conversion submodule includes a detector and a limiting amplifier.

[0023] Furthermore, the photoelectric conversion submodule further includes a second encoder, and the decoder is used to process low-speed signals.

[0024] This utility model provides an all-optical HDMI transmission component. Using a voltage-boosting submodule, it senses light and converts it into a +5V voltage, which serves as the hot-swap activation voltage. This eliminates the need for hybrid cables or additional USB plugs, effectively simplifying the structure of the HDMI transmission component. Compared to copper-core or hybrid cables, all-optical transmission offers faster speeds, lower attenuation, longer transmission distances, and superior transmission quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To further illustrate the above and other advantages and features of various embodiments of the present invention, a more detailed description of various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings depict only typical embodiments of the present invention and are not to be considered as limiting the scope thereof. In the drawings, for clarity, identical or corresponding components will be represented by the same or similar reference numerals.

[0026] Figure 1 A schematic structural diagram of an HDMI all-optical transmission component according to an embodiment of the present invention is shown;

[0027] Figure 2 A schematic structural diagram of a transmitting module according to an embodiment of the present invention is shown;

[0028] Figure 3 A schematic structural diagram of a receiving module according to an embodiment of the present invention is shown;

[0029] Figure 4 A schematic structural diagram showing a boost submodule according to an embodiment of the present invention; and

[0030] Figure 5 A schematic structural diagram of a boost circuit according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings in conjunction with specific embodiments. It should be noted that the components in the accompanying drawings may be exaggerated for illustration purposes and are not necessarily proportional. In the accompanying drawings, components that are identical or have the same function are given the same reference numerals.

[0032] In this utility model, unless otherwise specified, the expressions "arranged on," "arranged above," and "arranged above" do not exclude the existence of intermediate objects between the two. Furthermore, "arranged on or above" merely indicates the relative positional relationship between two components. In certain circumstances, such as after reversing the product orientation, it can also be converted to "arranged below or below," and vice versa.

[0033] In the present invention, each embodiment is only intended to illustrate the solution of the present invention and should not be understood as limiting.

[0034] In the present invention, unless otherwise specified, the quantifiers "a" and "an" do not exclude the presence of multiple elements.

[0035] It should also be pointed out that in the embodiments of the present invention, for the sake of clarity and simplicity, only a portion of the parts or components may be shown, but a person skilled in the art will understand that under the guidance of the present invention, the required parts or components may be added according to the needs of the specific scenario.

[0036] It should also be noted that within the scope of the present invention, terms such as "same," "equal," and "equal to" do not mean that the values ​​of two items are absolutely equal, but rather allow for a certain reasonable error. In other words, the terms also encompass "substantially the same," "substantially equal," and "substantially equal." Similarly, in the present invention, terms such as "perpendicular to" and "parallel to" indicating direction also encompass the meaning of "substantially perpendicular to" and "substantially parallel to."

[0037] To achieve all-optical HDMI transmission, the present invention incorporates a voltage-boosting submodule at the HDMI receiving end—the end connected to the display device. When using all-optical transmission, the HDMI transmitting end generates light when plugged into a device. This light is sensed by the voltage-boosting submodule and converted into a +5V voltage, replacing the +5V electrical signal transmitted via copper cables in existing technology. This also eliminates the need for an additional USB plug or external power supply to trigger a hot-plug detection signal, effectively simplifying the HDMI transmission component and reducing the number of interfaces.

[0038] The present invention will be further described below with reference to the accompanying drawings in conjunction with specific embodiments.

[0039] Figure 1 The following is a schematic diagram showing the structure of an HDMI all-optical transmission component according to an embodiment of the present invention. Figure 1 As shown, an all-optical transmission component for HDMI includes a transmission cable 101, a transmitter module 102, and a receiver module 103, wherein the transmitter module 102 and the receiver module 103 are respectively arranged at both ends of the transmission cable 101. The transmitter module 102 can be connected to a source device (Source) to receive the HDMI signal sent by the source device, convert the signal into an optical signal, and then transmit it to the receiver module 103 through the transmission cable 101. The receiver module 103 can be connected to a display device (Display), and after receiving the optical signal, it converts the signal into an electrical signal and transmits it to the display device.

[0040] In one embodiment of the present invention, the transmission cable 101 utilizes all-optical transmission and includes several optical fibers. These optical fibers can be used, for example, to transmit four high-speed differential TMDS signals for high-speed video transmission, as well as multiple low-speed signals. These low-speed signals include, for example, the HPD (hot plug detection) signal for detecting device connection status and enabling hot plugging, the CEC (consumer electronics control) channel signal for inter-device control communication, such as turning on and off devices like TVs and set-top boxes, the Internet transmission network signal for enabling device network connectivity, the SDA (serial data) signal for serial communication, commonly used in the I2C bus, the SCL (serial clock) signal for serial communication, and the DDC (display data channel) signal for reading the extended display identification data (EDID) of a display device to determine the device's display capabilities and parameters. In one embodiment of the present invention, the optical fibers support HDMI protocols such as HDMI 1.4, HDMI 2.0, and HDMI 2.1. They can be single-mode or multimode optical fibers, and can be selected as needed to transmit optical signals of different wavelengths.

[0041] Figure 2 FIG. 1 is a schematic diagram showing the structure of a transmitting module according to an embodiment of the present invention. Figure 2As shown, the transmitting module includes a gold finger 201 and an electro-optical conversion submodule 202. The gold finger 201 is arranged at the front end of the transmitting module, and is used to lead the HDMI signal of the source device to the electro-optical conversion submodule 202, wherein the HDMI signal is in the form of an electrical signal. The electro-optical conversion submodule 202 is used to convert the HDMI electrical signal into an optical signal, and send it to the transmission cable, and transmit it to the receiving module through an optical fiber. In one embodiment of the present utility model, the electro-optical conversion submodule includes a driver chip and a laser. The HDMI signal sent by the source device is transmitted to the driver chip in the form of an electrical signal, and the electrical signal processed by the driver chip enters the laser and is converted into an optical signal. As mentioned above, the HDMI signal includes a high-speed signal and a low-speed signal, wherein the high-speed signal can directly enter the electro-optical conversion submodule to be converted into an optical signal and transmitted. The low-speed signal needs to be encoded or parsed by a DDC transmission protocol such as an FPGA or other customized chip to support optical fiber transmission. Based on this, in one embodiment of the present invention, the electro-optical conversion submodule 202 further includes a first encoder for encoding or parsing low-speed signals to support optical fiber transmission. The DDC transmission protocol, which includes extended display identification data (EDID), high-bandwidth digital content protection (HDCP), and status and control data channels (SCDC), establishes an information channel between the source device and the display device via the DDC transmission protocol, thereby enabling communication between the source device and the terminal display device. The encoded and parsed low-speed signal enters the electro-optical conversion submodule 202, where it is converted into an optical signal and transmitted.

[0042] Figure 3 FIG. 1 is a schematic diagram showing the structure of a receiving module according to an embodiment of the present invention. Figure 3As shown, the receiving module includes a gold finger 301 and an optoelectronic conversion submodule 302. The gold finger 301 is located at the front end of the receiving module and is used to transmit the HDMI signal converted by the optoelectronic conversion submodule 302 to the display device. The HDMI signal is in the form of an electrical signal. The optoelectronic conversion submodule 302 is used to convert the optical signal transmitted by the transmission cable into an electrical signal for transmission to the display device. In one embodiment of the present invention, the optoelectronic conversion submodule includes a detector and a limiting amplifier. After the optical signal is transmitted to the receiving module, it is converted into an electrical signal by the detector of the optoelectronic conversion submodule 302. The electrical signal then enters the limiting amplifier for processing, and the processed electrical signal enters the display device. Similarly, high-speed signals can enter the display device directly, but low-speed signals require DDC transmission protocol encoding or parsing by a second encoder, such as an FPGA or other custom chip, before entering the display device. Therefore, in one embodiment of the present invention, the optoelectronic conversion submodule 302 also includes a second encoder, which is used to process the low-speed signal so that it can enter the display device.

[0043] As mentioned above, in order to achieve all-optical transmission without adding external components, the present invention adds a boost submodule 303 to the receiving module. The boost submodule 303 can sense the light emitted by the transmitting module 102 and convert the light into a +5V electrical signal to serve as the excitation voltage for hot swapping. Figure 4 FIG. 1 is a schematic diagram showing the structure of a boost submodule according to an embodiment of the present invention. Figure 4 As shown, in one embodiment of the present invention, the boost submodule includes a photoelectric conversion circuit 401 and a boost circuit 402. The photoelectric conversion circuit 401 is used to convert the light emitted by the transmitting module 102 into a first DC voltage, and the boost circuit 402 is used to boost the first DC voltage and convert it into a +5V electrical signal.

[0044] In one embodiment of the present invention, light emitted from the emitter is sensed by a photosensitive element, such as a MOS capacitor and / or a photoresistor, and converted into an electrical signal. If a MOS capacitor is used, when light strikes the P-type silicon substrate of the MOS capacitor, electron-hole pairs (i.e., photogenerated charges) are generated. The electrons are attracted by the gate and stored in a trap. Strong incident light generates more photogenerated charges, while weak incident light generates less photogenerated charges. The MOS capacitor achieves photoelectric conversion by converting the intensity of light into a charge proportional to the intensity of light. If a photoresistor is used, when light strikes the semiconductor material of the photoresistor, photons collide with valence band electrons in the semiconductor, causing electrons to transition from the valence band to the conduction band, forming electron-hole pairs. The formation of these electron-hole pairs increases the carrier concentration in the semiconductor, reducing the resistivity. Conversely, when the light weakens or disappears, the electron-hole pairs recombine, reducing the carrier concentration in the semiconductor and increasing the resistivity. A photoresistor can be considered to achieve photoelectric conversion by converting the intensity of light into a resistance value proportional to the intensity of light. It should be understood that in other embodiments of the present invention, other photosensitive elements and corresponding circuit structures may also be used to implement this function.

[0045] In one embodiment of the present invention, in order to simplify the circuit structure, the photoelectric conversion circuit 401 can use the 3.3V bias voltage recovered by the receiving module from the high-speed differential TMDS signal as its driving power supply. Therefore, the first DC voltage obtained by its conversion must not be higher than 3.3V and needs to be further boosted by a boost circuit. Figure 5 FIG. 1 is a schematic diagram showing the structure of a boost circuit according to an embodiment of the present invention. Figure 5 As shown, in one embodiment of the present invention, the boost circuit utilizes a switching DC-DC boost circuit. As shown, the switching DC-DC boost circuit includes an inductor L, a switch SW, a diode D, and a smoothing capacitor C, wherein the switch is a power electronic device, such as a MOSFET or BJT transistor controlled by a PWM signal. When the switch SW is closed, the inductor L accumulates energy by receiving current from the source, i.e., the output terminal of the photoelectric conversion circuit 401. When the switch SW is open, the coil retains the energy accumulated in the magnetic field, and the current attempts to remain at the same level. However, the additional energy from the inductor increases the voltage, thereby opening a path through the diode D. Some of the energy flows to the load Load, while the remaining energy accumulates in the smoothing capacitor C. Subsequently, the switch SW is locked, and the coil begins to accumulate energy again. Simultaneously, the load receives energy from the capacitor, achieving a voltage boost. It should be understood that in other embodiments of the present invention, the boost circuit may also utilize other common boost circuit structures.

[0046] In one embodiment of the present invention, optical lenses are further provided in the transmitting module and receiving module. These optical lenses, for example, can be high-precision multi-channel lenses, respectively covering the electro-optical conversion submodule 202 and the photoelectric conversion submodule 302. The ends of the optical fiber are fixed relative to the optical lenses. The optical lens corresponding to the photoelectric conversion submodule 302 converts the optical signal transmitted by the optical fiber, which is horizontal relative to the receiving module, into a perpendicular optical signal, which is then transmitted to the photoelectric conversion submodule 302. The optical lens corresponding to the electro-optical conversion submodule 202 converts the optical signal emitted by the electro-optical conversion submodule 202, which is perpendicular to the transmitting module, into an optical signal parallel to the transmitting module, which is then transmitted through the optical fiber.

[0047] This utility model provides an all-optical HDMI transmission component. Using a voltage-boosting submodule, it senses light and converts it into a +5V voltage, which serves as the hot-swap activation voltage. This eliminates the need for hybrid cables or additional USB plugs, effectively simplifying the structure of the HDMI transmission component. Compared to copper-core or hybrid cables, all-optical transmission offers faster speeds, lower attenuation, longer transmission distances, and superior transmission quality.

[0048] Although various embodiments of the present invention have been described above, it should be understood that they are presented by way of example only and not limitation. It will be apparent to those skilled in the relevant art that various combinations, modifications, and variations may be made thereto without departing from the spirit and scope of the present invention. Therefore, the breadth and scope of the present invention as disclosed herein should not be limited by the exemplary embodiments disclosed above, but should be defined solely in accordance with the appended claims and their equivalents.

Claims

1. An all-optical transmission component for HDMI, characterized in that: include: a transmission cable comprising a plurality of optical fibers; a transmitting module, which is arranged at the first end of the transmission cable; as well as A receiving module is provided at the second end of the transmission cable. The receiving module includes a boost submodule, which is configured to sense the light emitted by the transmitting module and convert the light into a +5V electrical signal as an excitation voltage for hot plugging.

2. The all-optical transmission component according to claim 1, wherein: The boost submodule includes: a photoelectric conversion circuit configured to convert the light emitted by the emission module into a first DC voltage; and A boost circuit is configured to convert the first DC voltage into a +5V electrical signal.

3. The all-optical transmission component according to claim 2, wherein: The photoelectric conversion circuit includes a capacitor and / or a photoresistor, and uses the +3.3V voltage restored by the receiving module as a power supply. The capacitor and / or photoresistor is configured to sense the light emitted by the transmitting module and convert it into an electrical signal.

4. The all-optical transmission component according to claim 2, wherein: The boost circuit includes a switching DC-DC boost circuit.

5. The all-optical transmission component according to claim 1, wherein: The transmitting module includes: a gold finger configured to transmit an electrical signal; and The electro-optical conversion submodule is electrically connected to the gold finger and is configured to convert the electrical signal into an optical signal and send the optical signal to the transmission cable.

6. The all-optical transmission component according to claim 5, wherein: The electro-optical conversion submodule includes a driver chip and a laser.

7. The all-optical transmission component according to claim 6, wherein: The electro-optical conversion submodule further includes a first encoder configured to encode or parse the low-speed signal to support optical fiber transmission.

8. The all-optical transmission component according to claim 1, wherein: The receiving module includes: a gold finger configured to transmit an electrical signal; and The photoelectric conversion submodule is configured to convert the optical signal received from the transmission cable into an electrical signal and transmit the electrical signal to the gold finger.

9. The all-optical transmission component according to claim 8, wherein: The photoelectric conversion submodule includes a detector and a limiting amplifier.

10. The all-optical transmission component according to claim 9, wherein: The photoelectric conversion submodule further includes a second encoder configured to process a low-speed signal.

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