CN216670718U - Awakening system of vehicle-mounted display - Google Patents
Awakening system of vehicle-mounted display Download PDFInfo
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- CN216670718U CN216670718U CN202123366158.5U CN202123366158U CN216670718U CN 216670718 U CN216670718 U CN 216670718U CN 202123366158 U CN202123366158 U CN 202123366158U CN 216670718 U CN216670718 U CN 216670718U
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Abstract
The utility model discloses a wake-up system of a vehicle-mounted display, wherein a wake-up signal is injected to a low-voltage differential line LDVS (low voltage differential voltage) for connecting a host computer and the vehicle-mounted display for transmission, the low-voltage differential line LDVS is connected with a first end of a capacitor C2, and a second end of a capacitor C2 is connected to a deserializer of the vehicle-mounted display; and a wiring terminal is led out from the first end of the capacitor C2 and is connected to the awakening signal input end of the main control unit MCU of the vehicle-mounted display after passing through the current-limiting resistor R1. The utility model has the advantages that: the LDVS of the vehicle-mounted display is adopted to transmit the wake-up signal, so that the wiring harness and the plug connector are reduced, and the cost can be saved; the wake-up signal generating circuit is integrated in the host machine, so that the MCU of the vehicle-mounted display can be conveniently driven and woken up according to the control of the host machine, and the wake-up is simpler and quicker; the wake-up signal and the alternating current high data stream signal corresponding to the LVDS are not interfered with each other, and the transmission of two signals by one wire harness is realized.
Description
Technical Field
The utility model relates to the field of automotive electronics, in particular to a wake-up system of a vehicle-mounted display.
Background
In a vehicle-mounted device, more and more products such as HUD/Display and the like are gradually applied to a vehicle, but in the driving mode of the vehicle-mounted Display in the prior art, a driving level signal is connected into the vehicle-mounted Display through a connector by a hard wire cable through a connector interface arranged on the vehicle-mounted Display through the connector, a driving wake-up signal is provided for an MCU in the vehicle-mounted Display, the mode requires that the vehicle-mounted Display is reserved with a socket corresponding to the connector for wake-up in advance, and simultaneously requires a cable for signal transmission, thereby increasing the interfaces on the connector and the vehicle-mounted Display. The awakening mode depends on the arranged connector interface and needs corresponding hard line transmission, and is higher in cost, so that the requirements of integration and low cost of the vehicle-mounted display cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a novel awakening system of a vehicle-mounted display.
In order to achieve the purpose, the utility model adopts the technical scheme that: a wake-up system of a vehicle-mounted display is characterized in that a wake-up signal is injected to a low-voltage differential line LDVS (low voltage differential voltage) for connecting a host computer and the vehicle-mounted display for transmission, the low-voltage differential line LDVS is connected with a first end of a capacitor C2, and a second end of a capacitor C2 is connected to a deserializer of the vehicle-mounted display; and a wiring terminal is led out from the first end of the capacitor C2 and is connected to the awakening signal input end of the main control unit MCU of the vehicle-mounted display after passing through the current-limiting resistor R1.
The wake-up signal is generated by a wake-up signal generating circuit, the output end of the wake-up signal generating circuit is connected to a low-voltage differential line LDVS through a resistor R1, the leading-out terminal of a connecting line between the resistor R1 and the low-voltage differential line LDVS is connected to the cathode of a voltage stabilizing diode Z1, and the anode of the voltage stabilizing diode Z1 is grounded; the connection between the resistor R2 and the first end of the capacitor C2 is connected to ground via a resistor R3.
The wake-up signal generating circuit comprises triodes Q1 and Q2 and a battery, wherein the battery is connected with a collector of a triode Q1, a base of the triode Q1 is connected with a collector of a triode Q2, and an emitter of a triode Q2 is grounded; the base electrode of the triode Q2 is connected with a host computer used for driving the vehicle-mounted display to display images; the emitter of the transistor Q1 is connected with a resistor R1.
The vehicle-mounted display screen is driven by a host to display images, the host comprises a main control SOC and a serializer, the main control SOC is connected with the serializer, the serializer is connected with a capacitor C1, and the capacitor C1 is connected to a first end of a capacitor C2 in the vehicle-mounted display through a low-voltage differential line LDVS; the wake-up signal generating circuit is connected to the low voltage differential line LDVS between the capacitor C1 and the capacitor C2.
The wake-up signal generating circuit is integrated in the host, and the output end of the wake-up signal generating circuit is connected to a low-voltage differential signal (LVDS) in the host.
The utility model has the advantages that: the LDVS of the vehicle-mounted display is adopted to transmit the wake-up signal, so that the wiring harness and the plug connector are reduced, and the cost can be saved; the wake-up signal generating circuit is integrated in the host machine, so that the MCU of the vehicle-mounted display can be conveniently driven and woken up according to the control of the host machine, and the wake-up is simpler and quicker; the wake-up signal and the alternating current high data stream signal corresponding to the LVDS are not interfered with each other, and the transmission of two signals by one wire harness is realized.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a circuit diagram of a wake-up system according to the present invention.
Detailed Description
The following description of preferred embodiments of the utility model will be made in further detail with reference to the accompanying drawings.
In the prior art, after a wake-up signal is generated, the wake-up signal is transmitted to a HUD/Display of a vehicle-mounted Display through a hard-wire cable, and then the signal is transmitted to an internal circuit through a connector, a socket and the like, and then the wake-up signal is sent to a wake-up signal input end of a main control unit MCU of the vehicle-mounted Display, so that the MCU is woken up to work, and LDVS data sent by a host can be controlled to execute and Display images after the MCU works. The awakening mode needs one hard wire and also needs a vehicle-mounted display reserved interface plug connector and the like, the cost is increased, how to optimize the awakening system to meet the requirement of the cost is achieved, the scheme for transmitting the awakening signal based on the LDVS wire is provided, and the awakening signal does not affect the alternating-current high-data-stream signal transmitted by the host. The specific scheme is as follows:
as shown in fig. 1, the display operation principle of the lower in-vehicle display will be described first. The vehicle-mounted host computer firstly needs to be in an awakening state, the awakening state needs to provide an awakening signal for the MCU, then the vehicle-mounted host computer sends a video stream signal (alternating current high data stream signal) to be transmitted to the vehicle-mounted display through the low-voltage differential line LDVS so as to transmit data, and then image display is realized based on the control of the MCU. The wake-up signal of the present application is generally a direct current low-frequency high-level signal, the two signals do not interfere with each other, and the wake-up signal of the present application can be removed based on decoupling capacitors on the host side and the display side, so that the transmission of the wake-up signal can be realized in a multiplexing manner.
As shown in fig. 1, in a wake-up system of a vehicle-mounted display, a wake-up signal generating circuit generates a wake-up signal, and injects the wake-up signal to a low voltage differential line LDVS for connection between a host and the vehicle-mounted display, the low voltage differential line LDVS is connected to a first end of a capacitor C2, and a second end of a capacitor C2 is connected to a deserializer of the vehicle-mounted display; and a wiring terminal is led out from the first end of the capacitor C2 and is connected to the awakening signal input end of the main control unit MCU of the vehicle-mounted display after passing through the current-limiting resistor R1.
The transmission of video stream data (AC high data stream signal) between the host and the vehicle-mounted display is as follows: the host machine side comprises a host machine SOC, a Serializer and a decoupling capacitor C1, the vehicle-mounted display side comprises a deserializer De-Serializer, a decoupling capacitor C2 and an MCU, the host machine SOC is connected with the decoupling capacitor C1 after passing through the Serializer, the decoupling capacitor C1 and a low-voltage differential line LDVS are connected to a capacitor C2 in a vehicle-mounted display screen, and the other end of the capacitor C2 is connected to the deserializer. The present application utilizes the segment of the LDVS line C1-C2 to transmit the wake-up signal. The general host SOC, the serializer and the capacitor C1 are integrated together, and then the C1 is connected to the connector on the display side through a connector and a low-voltage differential line LDVS outside the host and then is connected to the capacitor C2 in the vehicle-mounted display.
The output end of the wake-up signal generating circuit is connected to a low-voltage differential line LDVS through a resistor R1, the leading-out terminal on a connecting line between the resistor R1 and the low-voltage differential line LDVS is connected to the cathode of a voltage stabilizing diode Z1, and the anode of the voltage stabilizing diode Z1 is grounded; the connection between the resistor R2 and the first end of the capacitor C2 is connected to ground via a resistor R3.
The wake-up signal generating circuit comprises triodes Q1 and Q2 and a battery, wherein the battery is connected with a collector of a triode Q1, a base of a triode Q1 is connected with a collector of a triode Q2, and an emitter of a triode Q2 is grounded; the base electrode of the triode Q2 is connected with a host computer used for driving the vehicle-mounted display to display images; the emitter of transistor Q1 is connected to resistor R1.
The vehicle-mounted display screen is driven by a host to display images, the host comprises a main control SOC and a serializer, the main control SOC is connected with the serializer, the serializer is connected with a capacitor C1, and a capacitor C1 is connected to a first end of a capacitor C2 in the vehicle-mounted display through a low-voltage differential line LDVS; the wake-up signal generating circuit is connected to the low voltage differential line LDVS between the capacitor C1 and the capacitor C2. The wake-up signal generating circuit is integrated in the host, and its output terminal is connected to the low voltage differential line LVDS in the host, that is, the line near C1 on the LDVS line in the host housing, i.e., the segment C1-C2. Since the whole wake-up signal generating circuit is integrated in the host, the output terminal of the wake-up signal generating circuit can be directly connected to the second terminal of C1 for the convenience of injecting the wake-up signal onto the LVDS line, the first terminal of C1 is the terminal connected to the serializer, and the second terminal is the terminal not connected to the serializer. Meanwhile, the LDVS line comprises a positive line and a negative line, and the LDVS positive line LDVS + is adopted to transmit the wake-up signal.
The working principle is as follows: because the data stream signal transmitted between the host and the vehicle-mounted display through the low-voltage differential line LDVS is an alternating-current high-data stream signal, the wake-up signal is a direct-current low-frequency high-level signal, after the wake-up signal is injected, the frequency of the host and the frequency of the wake-up signal are different, one alternating current is a direct current, the wake-up signal is not interfered with each other, decoupling capacitors are arranged at the output of the serializer and the input end of the deserializer to isolate the direct current, and the wake-up signal can be filtered, so that the interaction of video stream data between the host and the display screen is not affected, and the wake-up signal is obtained by the MCU before the capacitor C2 is filtered, and therefore, the non-interference wake-up can be realized.
When the MCU needs to be awakened, the SOC in the host machine sends out a driving signal to enable Q1 and Q2 to be conducted to generate a direct current level signal (high level signal), the high level signal is subjected to voltage stabilization through Z1 and then is transmitted into a vehicle-mounted display (before C2) through an LDVS wire, then R1 and R3 form a voltage division signal to divide voltage, then the voltage is subjected to current limitation through a resistor R2 to form a voltage division and current limitation voltage signal, the voltage division and current limitation voltage signal is transmitted to an MCU awakening signal input end of the vehicle-mounted display, the transmission signal is high level, the MCU is awakened to work, and after the MCU obtains the high level awakening signal, the MCU awakening signal is awakened to be normally started according to a software system. The wake-up signal input end of the MCU is respectively connected with the cathode of the D1 and the anode of the D2, the cathode of the diode D2 is connected with a power supply VCC, and the anode of the diode D1 is grounded. The diodes D1, D2 act as voltage clamps to protect the MCU ports. When overvoltage occurs, D2 is conducted, and the voltage of the MCU port is clamped at Vcc + 0.5V; when negative voltage interference occurs, D1 is conducted, and the voltage of the MCU port is clamped at GND-0.5V. Therefore, the voltage of the port of the MCU is protected from being too high or too low negative voltage. Thereby realizing a complete awakening workflow. And the application awakens based on the LDVS line, the high-level signal acts on the LVDS + hard line, and the LVDS signal is superposed and transmitted to the HUD/Display product through the hard line, so that the optimization cost is optimized, the awakening step is simplified, and the method is simple and reliable.
It is clear that the specific implementation of the utility model is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the utility model.
Claims (5)
1. A wake-up system of a vehicle-mounted display is characterized in that: the wake-up signal is injected to a low-voltage differential line LDVS used for connecting the host computer and the vehicle-mounted display for transmission, the low-voltage differential line LDVS is connected with a first end of a capacitor C2, and a second end of a capacitor C2 is connected to a deserializer of the vehicle-mounted display; and a wiring terminal is led out from the first end of the capacitor C2 and is connected to the awakening signal input end of the main control unit MCU of the vehicle-mounted display after passing through the current-limiting resistor R1.
2. A wake-up system for a vehicle display as claimed in claim 1, wherein: the wake-up signal is generated by a wake-up signal generating circuit, the output end of the wake-up signal generating circuit is connected to a low-voltage differential line LDVS through a rear leading-out terminal of a resistor R1, the leading-out terminal of a connecting line between the resistor R1 and the low-voltage differential line LDVS is connected to the cathode of a voltage stabilizing diode Z1, and the anode of the voltage stabilizing diode Z1 is grounded; the connection between the resistor R2 and the first end of the capacitor C2 is connected to ground via a resistor R3.
3. A wake-up system for a vehicle display as claimed in claim 2, wherein: the wake-up signal generating circuit comprises triodes Q1 and Q2 and a battery, wherein the battery is connected with a collector of a triode Q1, a base of the triode Q1 is connected with a collector of a triode Q2, and an emitter of a triode Q2 is grounded; the base electrode of the triode Q2 is connected with a host computer used for driving the vehicle-mounted display to display images; the emitter of the transistor Q1 is connected with a resistor R1.
4. A wake-up system for a vehicle display as claimed in any one of claims 2 or 3, wherein: the vehicle-mounted display screen is driven by a host to display images, the host comprises a main control SOC and a serializer, the main control SOC is connected with the serializer, the serializer is connected with a capacitor C1, and the capacitor C1 is connected to a first end of a capacitor C2 in the vehicle-mounted display through a low-voltage differential line LDVS; the wake-up signal generating circuit is connected to a low-voltage differential line LDVS between a capacitor C1 and a capacitor C2.
5. The wake-up system for a vehicle-mounted display according to claim 4, wherein: the wake-up signal generating circuit is integrated in the host, and the output end of the wake-up signal generating circuit is connected to a low-voltage differential signal (LVDS) in the host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123366158.5U CN216670718U (en) | 2021-12-29 | 2021-12-29 | Awakening system of vehicle-mounted display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123366158.5U CN216670718U (en) | 2021-12-29 | 2021-12-29 | Awakening system of vehicle-mounted display |
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| CN216670718U true CN216670718U (en) | 2022-06-03 |
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| CN202123366158.5U Active CN216670718U (en) | 2021-12-29 | 2021-12-29 | Awakening system of vehicle-mounted display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115202602A (en) * | 2022-09-14 | 2022-10-18 | 湖北芯擎科技有限公司 | Display screen wake-up circuit |
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2021
- 2021-12-29 CN CN202123366158.5U patent/CN216670718U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115202602A (en) * | 2022-09-14 | 2022-10-18 | 湖北芯擎科技有限公司 | Display screen wake-up circuit |
| CN115202602B (en) * | 2022-09-14 | 2023-12-15 | 湖北芯擎科技有限公司 | Display screen wake-up circuit |
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