CN219372498U - Video transmission device, video projection system and vehicle - Google Patents
Video transmission device, video projection system and vehicle Download PDFInfo
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- CN219372498U CN219372498U CN202223350401.9U CN202223350401U CN219372498U CN 219372498 U CN219372498 U CN 219372498U CN 202223350401 U CN202223350401 U CN 202223350401U CN 219372498 U CN219372498 U CN 219372498U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The application relates to a video transmission device, video projection system and vehicle, the video transmission device includes: a shielded cable, a deserializer chip, and an image control chip; the shielding cable is connected with the data interface and used for transmitting video signals to the data interface; the deserializer chip is used for acquiring video signals from the data interface, decoding the video signals to obtain a plurality of pairs of differential signals, and transmitting the differential signals to an OpenLDI video interface of the image control chip; and the image control chip is used for converting the differential signals to obtain converted signals and performing image display control according to the converted signals. The transmission and decoding of video signals are completed through the shielding cable collocation deserializer circuit in the application, and then the decoded differential signals are transmitted to the OpenLDI video interface for display control, so that the transmission distance and the anti-interference capability of video transmission are improved, and the problem that the video projection effect of the car lamp is poor due to signal attenuation in the video transmission process is solved.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a video transmission device, a video projection system and a vehicle.
Background
With the development of DLP (Digital Light Processing ) projection technology, the application of the DLP in the automotive field is also becoming more and more widespread. For example, in automotive headlight applications, automotive pixel headlights are based on digital micro-galvanometer chips (DMD chips) and use DLP technology to implement projection of millions of pixels of an automotive light, and may be used for driving assistance or entertainment functions. In practical applications, the pixel headlight needs to project not only a still image but also a moving video image.
When the PGU (Picture Generation Unit, image generating unit) of the car lamp performs dynamic video projection, the video format needs to be converted and transmitted to realize the projection of the dynamic video. The video transmission interface scheme supported by the PGU at present is easy to be influenced by distance and other electromagnetic interferences in video transmission due to weak anti-interference of a transmission wire harness, so that video signals are attenuated, and the effect of video projection of the car lamp is influenced.
Aiming at the problem that signal attenuation exists in the video transmission process in the related technology, so that the video projection effect of the car lamp is poor, no effective solution is proposed at present.
Disclosure of Invention
In this embodiment, a video transmission device, a video projection system and a vehicle are provided, so as to solve the problem of poor video projection effect of a vehicle lamp caused by signal attenuation in the video transmission process in the related art.
In a first aspect, in this embodiment, a video transmission device is provided, which is suitable for a video projection system, where the video projection system has a data interface; the video transmission device includes: a shielded cable, a deserializer chip, and an image control chip;
the shielding cable is connected with the data interface and used for transmitting video signals to the data interface;
the deserializer chip is used for acquiring the video signal from the data interface, decoding the video signal to obtain a plurality of pairs of differential signals, and transmitting the differential signals to an OpenLDI video interface of the image control chip;
the image control chip is used for converting the differential signals to obtain converted signals and performing image display control according to the converted signals.
In some embodiments, the apparatus further comprises: a protection circuit; the protection circuit is connected between the data interface and the deserializer chip and is used for inputting the video signal from the data interface to the deserializer chip so as to protect the video transmission device.
In some of these embodiments, the protection circuit includes: a protection circuit, and/or a filter circuit;
the protection circuit is used for absorbing the generated surge power when the transient surge voltage exists at the data interface;
the filtering power supply is used for filtering electromagnetic radiation interference generated by the video signal.
In some embodiments, the apparatus further comprises a digital micro-mirror; the digital micro-vibrating mirror is used for receiving the conversion signal transmitted by the image control chip and processing the conversion signal to obtain an image light signal so as to carry out video projection.
In some of these embodiments, the differential signals are LVDS signals, including 4 pairs of differential data signals and 1 pair of differential clock signals.
In a second aspect, in this embodiment, a video projection system is provided, which is suitable for a vehicle lamp; the video projection system comprises: a power module, a power management chip, and a video transmission device as described in the first aspect;
the power supply module is used for connecting an external power supply and supplying power to the video projection system through the power supply management chip;
the power management chip is used for supplying power to the chip of the video transmission device and the digital micro-vibrating mirror according to the driving signal.
In some embodiments, the video projection system has a drive control interface through which a drive control module is connected;
the driving control module comprises an LED driving module and an MCU module.
In some embodiments thereof, the LED driving module is configured to:
and adjusting the brightness of the light source of the LED according to the LED control signal output by the image control chip.
In some of these embodiments, the MCU module is configured to:
and monitoring the deserializer chip according to the working state signal fed back by the deserializer chip.
In a third aspect, in this embodiment there is provided a vehicle comprising a video projection system as described in the second aspect, and at least one vehicle lamp.
Compared with the related art, the video transmission device, the video projection system and the vehicle are provided in the embodiment, wherein the video transmission device is applicable to the video projection system, and the video projection system is provided with a data interface; the video transmission device includes: a shielded cable, a deserializer chip, and an image control chip; the shielding cable is connected with the data interface and used for transmitting video signals to the data interface; the deserializer chip is used for acquiring the video signal from the data interface, decoding the video signal to obtain a plurality of pairs of differential signals, and transmitting the differential signals to an OpenLDI video interface of the image control chip; the image control chip is used for converting the differential signals to obtain converted signals and performing image display control according to the converted signals. The transmission and decoding of the video signal are completed through the shielding cable and the deserializer circuit, and the decoded differential signal is transmitted to the OpenLDI video interface for display control, so that the transmission distance and the anti-interference capability of video transmission are improved, and the problem that the signal attenuation in the video transmission process causes poor video projection effect of the car lamp is solved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic diagram of a video transmission device in one embodiment;
FIG. 2 is a schematic diagram of the protection circuit and the filter circuit in one embodiment;
FIG. 3 is a schematic diagram of the architecture of a video projection system in one embodiment;
fig. 4 is a schematic diagram of the structure of a video projection system in a preferred embodiment.
Detailed Description
For a clearer understanding of the objects, technical solutions and advantages of the present application, the present application is described and illustrated below with reference to the accompanying drawings and examples.
Unless defined otherwise, technical or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," "these," and the like in this application are not intended to be limiting in number, but rather are singular or plural. The terms "comprising," "including," "having," and any variations thereof, as used in the present application, are intended to cover a non-exclusive inclusion; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (units) is not limited to the list of steps or modules (units), but may include other steps or modules (units) not listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference to "a plurality" in this application means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. Typically, the character "/" indicates that the associated object is an "or" relationship. The terms "first," "second," "third," and the like, as referred to in this application, merely distinguish similar objects and do not represent a particular ordering of objects.
With the development of DLP (Digital Light Processing ) projection technology, the application of the DLP in the automotive field is also becoming more and more widespread. For example, in automotive headlight applications, automotive pixel headlights are based on digital micro-galvanometer chips (DMD chips) and use DLP technology to implement projection of millions of pixels of an automotive light, and may be used for driving assistance or entertainment functions. In practical applications, the pixel headlight needs to project not only a still image but also a moving video image.
When the PGU (Picture Generation Unit, image generating unit) of the car lamp performs dynamic video projection, the video format needs to be converted and transmitted to realize the projection of the dynamic video. Currently, PGUs support two video transmission interfaces, an RGB888 video interface scheme and an OpenLDI (Open LVDS Display Interface ) video interface, respectively.
The principle of the RGB888 video interface scheme is to convert an HDMI (High Definition Multimedia Interface ) video signal into an RGB888 video signal through an image format converter and then transmit the RGB888 video signal to an RGB888 interface of a vehicle lamp PGU to realize video projection. The HDMI wire harness used for video transmission comprises 19 strands of signal wires, and the common wires do not comprise shielding layers, so that the risk of functional failure caused by electromagnetic interference is high, the anti-interference capability is poor, and meanwhile, the noise of a projection image is caused by signal distortion caused by electromagnetic radiation interference generated by high-frequency signals.
The principle of the OpenLDI video interface scheme is that video transmission is carried out through differential signals, more than 10 strands of video signals are needed to be contained in wire harness transmission, and due to the fact that the frequency of the signals is high, video signals are attenuated in long-distance transmission, and projection images are distorted.
According to the analysis, the prior technical scheme is easy to be influenced by distance and other electromagnetic interferences in video transmission due to weak anti-interference of the transmission wire harness, so that video signals are attenuated, and the effect of video projection of the car lamp is influenced.
In order to solve the above problems, the following embodiments provide a video transmission device, a video projection system, and a vehicle, which can complete transmission and decoding of video signals by a shielding cable and a deserializer circuit, and then transmit decoded differential signals to an OpenLDI video interface for image display control, thereby improving the transmission distance and anti-interference capability of video transmission.
In this embodiment, a video transmission device is provided and is suitable for a video projection system, where the video projection system has a data interface, and fig. 1 is a schematic structural diagram of the video transmission device in this embodiment, and as shown in fig. 1, the video transmission device includes a shielding cable, a deserializer chip, and an image control chip.
The shielding cable is connected with the data interface and used for transmitting video signals to the data interface.
The deserializer chip is used for acquiring video signals from the data interface, decoding the video signals to obtain a plurality of pairs of differential signals, and transmitting the differential signals to the OpenLDI video interface of the image control chip.
And the image control chip is used for converting the differential signals to obtain converted signals and performing image display control according to the converted signals.
Further, the video transmission device further comprises a high-speed coding circuit, and the high-speed coding circuit is used for carrying out compression coding on the signal of the video source to obtain the video signal.
Specifically, as shown in fig. 1, a signal of a video source is obtained, compression encoding is performed by a high-speed encoding circuit, after the video signal is obtained, the video signal is transmitted to a data interface through a shielding cable, and a video transmission device and a video projection system obtain signals of an external video source through the data interface. In the video transmission device, after the deserializer chip acquires the video signal from the data interface, the video signal is decoded to obtain a plurality of pairs of differential signals, and then the differential signals are transmitted to the OpenLDI video interface of the image control chip. The high-speed coding circuit comprises a serializer, and coding and decoding of video signals are completed through the high-speed coding circuit and a deserializer chip.
The differential signals are converted through the image control chip, and then image display control is carried out according to the converted signals.
Through the video transmission device provided by the embodiment, the HDMI cable in the RGB888 video interface scheme is not required, the transmission and decoding of video signals are completed through the shielding cable and the deserializer circuit in the OpenLDI video interface scheme, and then the decoded differential signals are transmitted to the OpenLDI video interface for display control, so that the transmission distance and the anti-interference capability of video transmission are improved, the stable transmission of video is realized, the problem that the signal attenuation in the video transmission process causes the poor video projection effect of the car lamp is solved. And the deserializer circuit can complete video signal input through a single differential link, so that the size of an interconnection line is reduced, and the development of miniaturization of a module is facilitated.
In some embodiments, in order to obtain better video transmission effect, a shielded twisted pair (Shielded Twisted Pair, STP) may be used for video signal transmission in the above embodiments, so as to prevent electromagnetic interference and increase data transmission speed, and a shielded twisted pair with a characteristic impedance of 100 Ω is preferred.
And an FPD-LINK III (Flat Panel Display Link III, flat panel display LINK) video signal obtained by compression encoding of a High-Speed encoding circuit is accessed through an HSD (High Speed Data) interface, and then the FPD-LINK III video signal is decoded into a differential signal by a deserializer chip. The differential signals may be LVDS (Low Voltage Differential Signaling, low voltage differential signals), which enables signals to be transmitted at a rate of several hundred Mbps over a differential line pair or a balanced cable, and the low voltage amplitude and low current drive output thereof achieves low noise and low power consumption, including 4 pairs of differential data signals and 1 pair of differential clock signals, corresponding to the transmission of the LVDS signals to the OpenLDI video interface of the image control chip through the circuit board differential cabling connection.
The differential signals are converted by an image control chip, and the converted signals are Sub-LVDS signals (ultra low voltage differential signaling) by taking the LVDS differential signals as an example, and then the Sub-LVDS signals are used for controlling the image display of the digital micro-vibrating mirror.
Further, the deserializer chip and the image control chip may be DS90UB924 and DLPC230, respectively, but are not limited to the above two.
In some embodiments, the video transmission apparatus further includes: digital micro-vibrating mirror. As shown in fig. 1, the digital micro-vibrator is configured to receive the converted signal transmitted by the image control chip, and process the converted signal to obtain an image light signal for video projection.
Specifically, the digital micro-vibration mirror (Digtial Micromirror Devices, DMD) is an array formed by a plurality of small aluminum reflecting mirror surfaces, one small mirror surface corresponds to one pixel, and each pixel point is sequentially scanned onto the detector through the pixel-level controllable characteristic of the digital micro-vibration mirror and the high-speed turnover frequency of the digital micro-vibration mirror, so that high-speed passive point scanning imaging of an object under the condition of visible light in the daytime is realized. In this embodiment, the digital micro-mirrors convert the conversion signals (belonging to the electrical signals) transmitted by the image control chip into image light signals, and control each micro-mirror to turn over according to the image light signals to form image information, so as to perform video projection.
Preferably, taking the LVDS differential signal as an example, the converted signal is converted into a Sub-LVDS signal, and then the Sub-LVDS signal is converted into an image light signal in the digital micro-oscillator. The digital micro-galvanometer can be, but not limited to, DLP5533.
The digital micro-vibrator converts the electric signal of the conversion signal into the image light signal under the control of the conversion signal converted and transmitted by the image control chip, so as to perform video projection, and further realize the function of dynamic video projection.
Aiming at the problems that an RGB888 interface in the prior art is a 24-bit RGB parallel interface, which comprises 24 parallel data lines and 4 control lines, the overall layout interconnection size is large, the size of a vehicle lamp PGU is large, and the development of a miniaturized module is not facilitated, compared with the OpenLDI video interface scheme of the original vehicle lamp PGU, the video transmission device in the embodiment integrates a deserializer circuit, an image control chip and a digital micro-oscillator into a circuit board, the deserializer circuit decodes an externally input video signal, the deserializer circuit is connected to an OpenLDI video interface of the image control chip through a circuit board differential wiring, the image control chip converts the differential signal, realizes the conversion of an electric signal and an optical signal through a digital micro-oscillator, realizes the projection function of a dynamic video, and is beneficial to the integrated and miniaturized development of a video projection function module.
In some embodiments, the video transmission apparatus further includes: and a protection circuit. The protection circuit is connected between the data interface and the deserializer chip in fig. 1 and is used for inputting the video signal from the data interface to the deserializer chip so as to protect the video transmission device.
Further, the protection circuit includes: a protection circuit, and/or a filter circuit; the protection circuit is used for absorbing the generated surge power when the transient surge voltage exists at the data interface; and the filtering power supply is used for filtering electromagnetic radiation interference generated by the video signal.
Specifically, fig. 2 is a schematic structural diagram of a protection circuit and a filter circuit in this embodiment, as shown in fig. 2, the protection circuit may use an ESD (Electro-static discharge) protection circuit, and when a transient surge voltage is generated at the interface, a surge power is generated by pulling down a TVS tube at the input port of the data interface, and the TVS tube can absorb the surge power, so that the voltage of the subsequent stage is clamped at a safe value, and the subsequent stage is effectively protected. The rear-stage circuit comprises a deserializer chip, an image control chip, a digital micro-vibrating mirror and other circuits behind the data interface.
In this embodiment, as shown in fig. 2, the filter circuit may adopt a EMI (EMI filter) filter circuit, and when common mode current noise flows through the common mode choke coil, due to the same direction of the common mode current, a magnetic field in the coil is generated in the same direction to increase the inductance of the coil, so that the coil presents high impedance, a stronger damping effect is generated, electromagnetic waves generated by high-speed signals are restrained from radiating outwards, thereby achieving the purpose of filtering common mode current interference, and meanwhile, the AC coupling capacitor can realize the transmission of AC signals and the blocking of dc signals.
Through the protection circuit provided in this embodiment, corresponding functions can be respectively realized by including the protection circuit and/or the filter circuit, and it should be noted that the protection circuit and the filter circuit can be separately configured or combined, and the protection circuit is obtained by combining the ESD protection circuit and the EMI filter circuit, which is conducive to protection of a later-stage circuit and filtering of electromagnetic interference signals, so that stability of video transmission signals is realized in the video projection process.
In this embodiment, a video transmission method is provided, and is applied to the video transmission device, where the method includes the following steps:
step S310, a video signal is acquired and decoded to obtain a plurality of pairs of differential signals.
Specifically, a video signal of a video source is acquired, and the video signal is transmitted to a data interface through a shielded cable, and a video transmission device and a video projection system acquire an external video signal through the data interface. In the video transmission device, after a video signal is obtained from a data interface through a deserializer chip, the video signal is decoded to obtain a plurality of pairs of differential signals, and then the differential signals are transmitted to an OpenLDI video interface of an image control chip.
Step S320, converting the differential signal to obtain a converted signal, and performing image display control according to the converted signal.
Specifically, the differential signals are converted through an image control chip, and then image display control is performed on the digital micro-vibrating mirror in the video transmission device according to the conversion property obtained through conversion.
The steps complete the transmission and decoding of the video signal through the shielding cable matched with the deserializer circuit, and then the decoded differential signal is transmitted to the OpenLDI video interface for display control, so that the transmission distance and the anti-interference capability of video transmission are improved, the stable transmission of video is realized, and the problem that the video projection effect of the car lamp is poor due to signal attenuation in the video transmission process is solved.
In this embodiment, a video projection system is provided, which is suitable for a vehicle lamp, and fig. 3 is a schematic structural diagram of the video projection system in this embodiment, as shown in fig. 3, where the video projection system includes: the video transmission device comprises a power module, a power management chip and the video transmission device in any embodiment. The video transmission device comprises a high-speed coding circuit, a shielding cable, a deserializer chip, an image control chip and a digital micro-vibration mirror.
The power module is used for connecting an external power supply and supplying power to the video projection system through the power management chip; and the power management chip is used for supplying power to the chip of the video transmission device and the digital micro-vibrating mirror according to the driving signals.
Specifically, the video projection system is connected with an external power supply, performs voltage conversion by combining the input of the external power supply through the power supply module, and supplies power to the power management chip. The power management chip starts working according to an external driving signal and provides an enabling signal to control a BUCK circuit in the power module, and different voltages are sequentially generated to supply power for all chips in the video projection system. Meanwhile, the power management chip also generates voltage through an on-chip voltage regulator and is used for power supply of the digital micro-vibrating mirror surface overturning.
The power management chip may be, but not limited to, TPS99001, preferably, taking the power management chip as an example of TPS99001, the external power supply provides 6.5V input, and the power module converts 6.5V into 3.3v_tp99k through LDO (low dropout regulator, low dropout linear regulator) to supply power to the power management chip.
When the PROJ_ON driving control signal is input to the outside and is at a high level, the power management chip starts to work, and three BUCK circuits in the power module are controlled by an enabling signal, so that 6.5V is converted into 3.3V, 1.8V and 1.1V respectively and used for supplying power to each chip of the system. Meanwhile, V_OFFSET, V_BIAS and V_RESET voltages (8.5V/16V/-10V respectively) are generated through an on-chip voltage regulator and used for power supply of mirror surface overturning of the digital micro-vibrator, so that the digital micro-vibrator realizes a video projection function.
Through the video projection system in this embodiment, the deserializer circuit, the image control chip and the digital micro-vibrating mirror are integrated in a circuit board, the deserializer circuit decodes the video signal obtained by compression encoding of the high-speed encoding circuit, the video signal is connected to the OpenLDI video interface of the image control chip through the differential wiring of the circuit board, the image control chip converts the differential signal, and the conversion of the electric signal and the optical signal is realized through the digital micro-vibrating mirror, meanwhile, the power module and the power management chip are combined, so that the projection function of the dynamic video is realized, the integration and miniaturization development of the video projection function module are facilitated, meanwhile, the transmission of the projection video stream is carried out by using the high-speed serial encoding mode, the wiring harness interconnection size can be reduced, the system integration level is improved, and the transmission capacity and the anti-interference capability are improved.
In some of these embodiments, the video projection system has a drive control interface through which the drive control module is connected. The driving control module comprises an LED driving module and an MCU module. The LED driving module is used for adjusting the brightness of the light source of the LED according to the LED control signal output by the image control chip. The MCU module is used for monitoring the deserializer chip according to the working state signals fed back by the deserializer chip.
As shown in fig. 3, the drive control interface is connected to an external drive control module through a drive control signal line. The LED driving module in the driving control module adjusts the on and off of the LED current and the duty ratio according to the LED control signal output by the image control chip, thereby realizing the adjustment of the brightness of the LED light source. The LED control signals include an enable signal, a turn-off signal, and a PWM adjustment signal, specifically, pmic_ledsel_0 (for enabling control of the driving chip), pmic_ledsel_3 (for discharging of LED current), and pwm_out_0 (for adjustment of LED current size).
The deserializer chip feeds back a working state signal (PASS/LOCK) to the MCU module in the drive control module, the MCU module monitors the working state of the deserializer chip, and meanwhile, the MCU module also performs ON-off management ON the power management chip and controls the image control chip through the level of an external drive signal PROJ_ON signal.
In this embodiment, a vehicle is provided that includes the video projection system of any of the embodiments described above and at least one vehicle lamp.
Specifically, at least one lamp, such as a conventional lamp, a projection lamp, an interactive signal display lamp, etc., is provided at the outer periphery of the body of the vehicle. The projection lamp can select DLP pixel projection lamp, through the video projection system in the projection lamp, the effect of projection dynamic video around the automobile body to can improve video transmission's transmission distance and interference killing feature, solve the signal attenuation in the video transmission process, lead to the not good problem of car light video projection effect.
The present embodiment is described and illustrated below by way of preferred embodiments.
Fig. 4 is a schematic structural view of a video projection system in the preferred embodiment, the video projection system including: high-speed coding circuit, shielding twisted pair, ESD protection and EMI filter circuit, deserializer chip, image control chip, digital micro-oscillator mirror, power module and power management chip.
As shown in fig. 4, after the signal of the video source is compressed and encoded by the high-speed encoding circuit, an FPD-LINK III video signal is obtained and input to the HSD video interface through a 100 Ω shielded twisted pair, and the video signal is input to the deserializer chip after entering the ESD protection and EMI filter circuit; decoding the FPD-LINK III video signal into an LVDS signal by the deserializer chip, decoding the LVDS signal into 4 pairs of data differential lines and 1 pair of clock differential lines, and transmitting the data differential lines and the clock differential lines to an OpenLDI video interface of the image control chip; the image control chip converts LVDS signals into Sub-LVDS and transmits the Sub-LVDS signals to the digital micro-galvanometer, and the digital micro-galvanometer converts electric signals into optical signals and controls each micro-galvanometer to turn over, so that projection of dynamic video is realized. In fig. 4 TxCLKOUT0±indicates 1 pair of differential clock signals, txOUT0±, txOUT1±, txOUT2±and TxOUT3±indicates 4 pairs of differential data signals.
Further, the video projection system is provided with a drive control interface, the drive control interface is externally connected with the LED drive module and the MCU module, the image control chip outputs LED control signals (an enabling signal, a switching-off signal and a PWM (pulse-Width modulation) adjusting signal) to the LED drive module to control the working state of the LED light source, and the image control chip and the drive control interface are communicated through an SPI (Serial Peripheral Interface )/I2C connection protocol. The power supply module is combined with external 6.5V input, converts 6.5V into 3.3V_TPS99K through LDO to supply power for the power management chip, and simultaneously converts 6.5V into 3.3V, 1.8V and 1.1V respectively under the enabling control of the power management chip through three-way BUCK circuits and is used for supplying power for each chip of the system. The deserializer chip feeds back a working state signal (PASS/LOCK) to the MCU module in the drive control module, the MCU module monitors the working state of the deserializer chip, and meanwhile, the MCU module also performs ON-off management ON the power management chip and controls the image control chip through the level of an external drive signal PROJ_ON signal.
When the PROJ_ON driving control signal is input to the outside and is at a high level, the power management chip starts to work, and three BUCK circuits in the power module are controlled by an enabling signal, so that 6.5V is converted into 3.3V, 1.8V and 1.1V respectively and used for supplying power to each chip of the system. Meanwhile, V_OFFSET, V_BIAS and V_RESET voltages (8.5V/16V/-10V respectively) are generated through an on-chip voltage regulator and used for power supply of mirror surface overturning of the digital micro-vibrator, so that the digital micro-vibrator realizes a video projection function.
Through the video projection system in the preferred embodiment, the video signal transmission with stronger anti-interference performance can be realized by adopting the shielding twisted pair, long-distance and high-speed image signal transmission can be well performed even under a strong interference environment, and meanwhile, the protection of a back-end circuit is realized through the ESD protection circuit and the EMI filter circuit. The video signal input can be completed through a single differential link by adopting the deserializer circuit, the size of an interconnection line is reduced, and meanwhile, the encoding, the transmission and the decoding of the video signal are completed through the high-speed encoding circuit and the shielded twisted pair matching deserializer circuit, so that the transmission distance and the anti-interference capability of a video projection system are improved, and the stable transmission of the dynamic video is realized. Further, the original car lamp PGU is expanded, and the deserializer circuit, the image control chip and the digital micro-vibrating mirror are integrated on a circuit board, so that the support of the video projection system to the FPD-LINK III video signal is realized, and the integrated development of the system is facilitated.
There is also provided in this embodiment a computer device comprising a memory in which a computer program is stored and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.
Optionally, the computer device may further include a transmission device and an input/output device, where the transmission device is connected to the processor, and the input/output device is connected to the processor.
It should be noted that, specific examples in this embodiment may refer to examples described in the foregoing embodiments and alternative implementations, and are not described in detail in this embodiment.
In addition, in combination with the video transmission method provided in the above embodiment, a storage medium may be provided in this embodiment. The storage medium has a computer program stored thereon; the computer program, when executed by a processor, implements any of the video transmission methods of the above embodiments.
It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present application, are within the scope of the present application in light of the embodiments provided herein.
It is evident that the drawings are only examples or embodiments of the present application, from which the present application can also be adapted to other similar situations by a person skilled in the art without the inventive effort. In addition, it should be appreciated that while the development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as an admission of insufficient detail.
The term "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive. It will be clear or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the patent. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A video transmission device, adapted for use in a video projection system, the video projection system having a data interface; the video transmission device includes: a shielded cable, a deserializer chip, and an image control chip;
the shielding cable is connected with the data interface and used for transmitting video signals to the data interface;
the deserializer chip is used for acquiring the video signal from the data interface, decoding the video signal to obtain a plurality of pairs of differential signals, and transmitting the differential signals to an OpenLDI video interface of the image control chip;
the image control chip is used for converting the differential signals to obtain converted signals and performing image display control according to the converted signals.
2. The video transmission apparatus according to claim 1, further comprising: a protection circuit; the protection circuit is connected between the data interface and the deserializer chip and is used for inputting the video signal from the data interface to the deserializer chip so as to protect the video transmission device.
3. The video transmission apparatus according to claim 2, wherein the protection circuit includes: a protection circuit, and/or a filter circuit;
the protection circuit is used for absorbing the generated surge power when the transient surge voltage exists at the data interface;
the filter circuit is used for filtering electromagnetic radiation interference generated by the video signal.
4. The video transmission apparatus according to claim 1, further comprising: a digital micro-vibrating mirror;
the digital micro-vibrating mirror is used for receiving the conversion signal transmitted by the image control chip and processing the conversion signal to obtain an image light signal so as to carry out video projection.
5. The video transmission device of any one of claims 1-4, wherein the differential signals are LVDS signals comprising 4 pairs of differential data signals and 1 pair of differential clock signals.
6. A video projection system adapted for use with a vehicle lamp; the video projection system comprises: a power module, a power management chip, and a video transmission apparatus according to any one of claims 1 to 5;
the power supply module is used for connecting an external power supply and supplying power to the video projection system through the power supply management chip;
the power management chip is used for supplying power to the chip of the video transmission device and the digital micro-vibrating mirror according to the driving signal.
7. The video projection system of claim 6, wherein the video projection system has a drive control interface through which a drive control module is connected;
the driving control module comprises an LED driving module and an MCU module.
8. The video projection system of claim 7, wherein the LED driving module is configured to:
and adjusting the brightness of the light source of the LED according to the LED control signal output by the image control chip.
9. The video projection system of claim 7, wherein the MCU module is configured to:
and monitoring the deserializer chip according to the working state signal fed back by the deserializer chip.
10. A vehicle comprising a video projection system as claimed in any one of claims 6-9 and at least one vehicle lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223350401.9U CN219372498U (en) | 2022-12-14 | 2022-12-14 | Video transmission device, video projection system and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223350401.9U CN219372498U (en) | 2022-12-14 | 2022-12-14 | Video transmission device, video projection system and vehicle |
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| CN219372498U true CN219372498U (en) | 2023-07-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118075405A (en) * | 2024-04-22 | 2024-05-24 | 南京仁芯科技有限公司 | De-serializer, serial/de-serializer comprising same and automobile communication system using same |
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2022
- 2022-12-14 CN CN202223350401.9U patent/CN219372498U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118075405A (en) * | 2024-04-22 | 2024-05-24 | 南京仁芯科技有限公司 | De-serializer, serial/de-serializer comprising same and automobile communication system using same |
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