CN111204297A - Awakening method and device for vehicle-mounted display screen and vehicle - Google Patents
Awakening method and device for vehicle-mounted display screen and vehicle Download PDFInfo
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- CN111204297A CN111204297A CN202010135824.5A CN202010135824A CN111204297A CN 111204297 A CN111204297 A CN 111204297A CN 202010135824 A CN202010135824 A CN 202010135824A CN 111204297 A CN111204297 A CN 111204297A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
Abstract
The invention discloses a vehicle-mounted display screen awakening method, a vehicle-mounted display screen awakening device and a vehicle, wherein the awakening device comprises an awakening module, a control module and a high-speed signal wire; the wake-up module comprises a decoder and a power supply enabling module; the controller in the control module is used for sending the direct current control signal to a first signal input end of the power supply enabling module through the high-speed signal wire; the power supply enabling module is used for outputting a high level to wake up the vehicle-mounted display screen when the first signal input end is at a high level and the second signal input end is at a low level; the power supply enabling module is used for outputting a high level when the second signal input end inputs the high level and the first signal input end is a low level, and the power supply module is continuously started to maintain the work of the vehicle-mounted display screen. The awakening device provided by the invention avoids the condition that noise on a direct current control signal influences the quality of the high-speed signal, so that the high-speed signal has good signal integrity, and the awakening device has good electromagnetic compatibility, and has the advantages of low interference, low cost and the like.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted display screen control, in particular to a vehicle-mounted display screen awakening method and device and a vehicle.
Background
With the rapid development of car audio entertainment systems and auxiliary driving systems and the continuous improvement of video display technologies, video display technologies have been applied more and more in the field of car electronics, and car-mounted video products are beginning to rapidly occupy the whole car electronic market. In general, a vehicle enterprise adds various intelligent applications and a corresponding number of display screens in a vehicle, such as a back-up image, face recognition, video interaction in the vehicle, driving assistance, and the like. With the increase of the number of display screens on vehicles and the rapid increase of functions of electronic products, the requirements of various automobile manufacturers on the cost control of automobile parts are becoming stricter, and meanwhile, the requirements of electromagnetic interference (EMC) on the automobile are becoming higher and higher due to the fact that the electromagnetic environment on the automobile is becoming more complicated and worse.
At present, the common vehicle-mounted display screen awakening scheme mainly includes the following three types: (1) waking up the screen power supply or the MCU (microprocessor) of the screen through a dedicated hard wire, the wiring harness cost is high. (2) The front screen MCU is awakened through the high-speed signal line coupling direct current signal, the front screen MCU is used for lighting the screen for display, the screen is awakened and then the direct current awakening signal is removed, and the scheme needs the front screen with the MCU and is high in cost. (3) The power supply of the screen system is awakened by coupling the direct-current signal through the high-speed signal line, the awakening signal must be always effective in order to maintain the power supply, and the awakening signal noise can be superposed on the high-speed signal, so that the signal integrity and EMC (electro magnetic compatibility) of the high-speed signal are deteriorated, and the system performance is influenced. Therefore, the existing vehicle-mounted display screen awakening scheme has the problems of high cost, high noise and strong interference, and cannot meet the actual use requirement.
Disclosure of Invention
The invention aims to overcome the defects of high cost, high noise and strong interference of a vehicle-mounted display screen awakening scheme in the prior art, and provides a vehicle-mounted display screen awakening method, a vehicle-mounted display screen awakening device and a vehicle.
The invention solves the technical problems through the following technical scheme:
the invention provides a wake-up device of a vehicle-mounted display screen, which comprises a wake-up module, a control module and a high-speed signal wire, wherein the wake-up module is used for receiving a wake-up signal;
the awakening module comprises a decoder and a power supply enabling module;
one end of the high-speed signal line is connected with the control module, the other end of the high-speed signal line is respectively connected with the input end of the decoder and the first signal input end of the power supply enabling module, a GPIO (general purpose input/output port) enabling end of the decoder is electrically connected with the second signal input end of the power supply enabling module, and the output end of the power supply enabling module is electrically connected with a power supply module of the vehicle-mounted display screen;
the control module comprises a controller, wherein the controller is used for sending a direct current control signal to a first signal input end of the power supply enabling module through the high-speed signal wire;
the power supply enabling module is used for outputting a high level when the first signal input end is a high level and the second signal input end is a low level so as to start the power supply module to wake up the vehicle-mounted display screen;
the control module is further used for acquiring the level state of a GPIO enabling end of the decoder and stopping sending the direct current control signal when the level state is a high level;
the power supply enabling module is used for outputting a high level when the second signal input end inputs the high level and the first signal input end is a low level, and continuously starting the power supply module to maintain the work of the vehicle-mounted display screen.
Preferably, the control module is further configured to repeatedly acquire the level state for a set number of times when the level state of the GPIO enable terminal of the decoder is a low level, until the acquisition is stopped when the level state is a high level.
Preferably, the power enabling module comprises an or gate module.
Preferably, the high-speed signal wire is a shielded signal cable.
Preferably, the wake-up device comprises N sets of the high-speed signal lines; wherein N is more than or equal to 1 and is an integer.
Preferably, the control module further comprises an encoder, a communication bus and a video transmission line;
the communication bus and the video transmission line are respectively connected between the controller and the encoder;
the controller transmits video content to the encoder through the video transmission line;
the encoder is used for encoding the video content and transmitting the video content to the decoder through the high-speed signal line;
the decoder is used for decoding the encoded video content.
Preferably, the encoder comprises a serializer and the decoder comprises a decoder.
The invention also provides a method for waking up the vehicle-mounted display screen, which is realized by adopting the device for waking up the vehicle-mounted display screen, and comprises the following steps:
the power supply enabling module outputs a high level when the first signal input end is a high level and the second signal input end is a low level so as to start the power supply module to wake up the vehicle-mounted display screen;
the control module is also used for acquiring the level state of a GPIO enabling end of the decoder and stopping sending the direct current control signal when the level state is a high level;
and the power supply enabling module outputs a high level when the second signal input end inputs a high level and the first signal input end is a low level, and the power supply module is continuously started to maintain the work of the vehicle-mounted display screen.
Preferably, the wake-up method further includes:
and the control module repeatedly acquires the level state for a set number of times when the level state of the GPIO enabling end of the decoder is a low level, until the acquisition is stopped when the level state is a high level.
The invention further provides a vehicle which comprises the awakening device of the vehicle-mounted display screen.
The positive progress effects of the invention are as follows:
in the invention, a direct current control signal is directly coupled to a high-speed signal line, and the direct current control signal is firstly input into a power supply enabling module to wake up a vehicle-mounted display screen; meanwhile, when the GPIO enabling end of the decoder at the screen end is at a high level, the control module cancels the coupling direct current control signal, and the high level output by the GPIO enabling end maintains the work of the vehicle-mounted display screen, so that the condition that noise on the direct current control signal influences the quality of the high-speed signal is avoided, the high-speed signal has good signal integrity, and the awakening device has good electromagnetic compatibility; in addition, the MCU and the hard wire are removed, the cost is reduced, the circuit design is simple, the wide application is facilitated, the actual use requirement is better met, and the low-interference low-cost circuit has the advantages of low interference, low cost and the like.
Drawings
Fig. 1 is a schematic structural diagram of a wake-up device of a vehicle-mounted display screen according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a wake-up method for a vehicle-mounted display screen according to embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the wake-up device of the vehicle-mounted display screen of the present embodiment includes a wake-up module 1, a control module 2, and a high-speed signal line 3.
The awakening module 1 is arranged in the vehicle-mounted display screen, and awakening and sleeping of the vehicle-mounted display screen are controlled through the control module.
The wake-up module 1 comprises a decoder 4 and a power enabling module 5. Specifically, one end of the high-speed signal line 3 is connected with the control module 2, the other end of the high-speed signal line 3 is respectively connected with the input end of the decoder 4 and the first signal input end of the power supply enabling module 5, a GPIO _ Enable (GPIO Enable) of the decoder 4 is electrically connected with the second signal input end of the power supply enabling module 5, and the output end of the power supply enabling module 5 is electrically connected with the power supply module of the vehicle-mounted display screen;
the power enable module 5 includes an or gate module, that is, if any input terminal inputs a high level, the power enable module 5 outputs the high level.
The high-speed signal line 3 is an STP (high-speed signal shielded signal cable) and can transmit video and bidirectional control signals by an AC (alternating current) signal.
Preferably, the wake-up device comprises N sets of high-speed signal lines 3; wherein N is more than or equal to 1 and is an integer. The specific number of the high-speed signal lines is set and adjusted according to actual requirements.
The control module 2 comprises a controller 6, an encoder 7, a communication bus 8 and a video transmission line 9.
The communication bus 8 and the video transmission line 9 are respectively connected between the controller 6 and the encoder 7;
the controller 6 transmits the video content to the encoder 7 through a video transmission line 9;
the encoder 7 is used for encoding the video content and transmitting the video content to the decoder 4 through the high-speed signal line 3; the decoder 4 is used for decoding the encoded video content.
The communication bus includes an I2C bus (a bidirectional two-wire synchronous serial bus), an SPI (serial peripheral interface) bus, a UART (universal asynchronous receiver transmitter) bus, or the like.
The encoder 7 comprises a serializer and the decoder 4 comprises a decoder 4. The controller 6 is an SOC (system on chip).
The controller 6 is configured to send a DC Enable (direct current control signal) to the first signal input terminal of the power Enable module 5 through the high-speed signal line 3, that is, the first input terminal of the power Enable module 5 is at a high level at this time.
The power supply enabling module 5 is used for outputting a high level when the first signal input end is at a high level and the second signal input end is at a low level so as to start the power supply module to wake up the vehicle-mounted display screen;
the control module 2 is further configured to acquire a level state of the GPIO enable terminal of the decoder 4, and stop sending the dc control signal when the level state is a high level, that is, the first input terminal of the power enable module 5 is a low level at this time.
The power supply enabling module 5 is used for outputting a high level when the second signal input end inputs the high level and the first signal input end is a low level, and continuously starting the power supply module to maintain the work of the vehicle-mounted display screen.
Firstly, a host (namely a control module) enables a power supply (namely a power supply module) of a screen system through a coupling direct-current control signal; after the host reads the deserializer enable screen system power supply, the coupled direct current control signal is cancelled, the vehicle-mounted display screen is kept in a working state only through the deserializer enable screen system power supply, the condition that noise on the direct current control signal affects the quality of the high-speed signal is avoided, the condition that the enable signal of a hard wire in long-distance transmission fails after noise is superposed in a complex environment is also avoided, the GPIO enable end of a decoder at the screen end can send the enable signal to replace the direct current control signal to maintain the power supply action and further maintain the screen, the direct current control signal does not need to be maintained at the moment, noise cannot be introduced into the high-speed signal, the high-speed signal has good signal integrity, and meanwhile, the host has good EMC performance.
In addition, the control module 2 is further configured to repeatedly acquire the level state for a set number of times when the level state of the GPIO enable terminal of the decoder 4 is a low level, until the acquisition is stopped when the level state is a high level.
Setting a level state of a GPIO enabling end of a repeated acquisition decoder until a corresponding level state is a high level by considering the level signal which cannot be acquired by a control module in time due to the fact that the vehicle-mounted display screen is not powered on in time and other special conditions; when the level state of the GPIO enabling end of the decoder is still low during acquisition (for example, 10 times), the acquisition is ended. The number of repeated collection can be determined and adjusted according to actual conditions.
In the embodiment, a direct current control signal is directly coupled to a high-speed signal line, and the direct current control signal is input into a power supply enabling module to wake up a vehicle-mounted display screen; meanwhile, when the GPIO enabling end of the decoder at the screen end is at a high level, the control module cancels the coupling direct current control signal, and the high level output by the GPIO enabling end maintains the work of the vehicle-mounted display screen, so that the condition that noise on the direct current control signal influences the quality of the high-speed signal is avoided, the high-speed signal has good signal integrity, and the awakening device has good electromagnetic compatibility; in addition, the MCU and the hard wire are removed, the cost is reduced, the circuit design is simple, the wide application is facilitated, the actual use requirement is better met, and the low-interference low-cost circuit has the advantages of low interference, low cost and the like.
Example 2
The vehicle of the present embodiment includes the wake-up apparatus of the on-vehicle display screen of embodiment 1.
In this embodiment, the on-vehicle display screen's in the vehicle awakening device can avoid the noise influence high-speed signal quality's on the direct current control signal the condition for high-speed signal has good signal integrality, and makes this awakening device possess good electromagnetic compatibility performance.
Example 3
As shown in fig. 2, the method for waking up the vehicle-mounted display screen in this embodiment is implemented by using the wake-up device of the vehicle-mounted display screen in embodiment 1.
The awakening method of the vehicle-mounted display screen comprises the following steps:
s101, the controller sends a direct current control signal to a first signal input end of a power supply enabling module through a high-speed signal line;
s102, the power supply enabling module outputs a high level when the first signal input end is at a high level and the second signal input end is at a low level so as to start the power supply module to wake up the vehicle-mounted display screen;
s103, the control module also acquires the level state of a GPIO enabling end of the decoder and stops sending the direct current control signal when the level state is high level;
and S104, the power supply enabling module outputs high level when the second signal input end inputs high level and the first signal input end is low level, and the power supply module is continuously started to maintain the work of the vehicle-mounted display screen.
In addition, when the level state of the GPIO enabling end of the decoder is low level, the control module repeatedly collects the level state for a set number of times until the collection is stopped when the level state is high level.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The awakening device of the vehicle-mounted display screen is characterized by comprising an awakening module, a control module and a high-speed signal wire;
the awakening module comprises a decoder and a power supply enabling module;
one end of the high-speed signal line is connected with the control module, the other end of the high-speed signal line is respectively connected with the input end of the decoder and the first signal input end of the power supply enabling module, the GPIO enabling end of the decoder is electrically connected with the second signal input end of the power supply enabling module, and the output end of the power supply enabling module is electrically connected with the power supply module of the vehicle-mounted display screen;
the control module comprises a controller, wherein the controller is used for sending a direct current control signal to a first signal input end of the power supply enabling module through the high-speed signal wire;
the power supply enabling module is used for outputting a high level when the first signal input end is a high level and the second signal input end is a low level so as to start the power supply module to wake up the vehicle-mounted display screen;
the control module is further used for acquiring the level state of a GPIO enabling end of the decoder and stopping sending the direct current control signal when the level state is a high level;
the power supply enabling module is used for outputting a high level when the second signal input end inputs the high level and the first signal input end is a low level, and continuously starting the power supply module to maintain the work of the vehicle-mounted display screen.
2. The wake-up device of the vehicle-mounted display screen of claim 1, wherein the control module is further configured to repeatedly acquire the level state for a set number of times when the level state of a GPIO enabled terminal of the decoder is a low level until the acquisition is stopped when the level state is a high level.
3. The wake-up device for a vehicle-mounted display screen of claim 1, wherein the power enabling module comprises an or gate module.
4. The wake-up device of the vehicular display screen according to claim 1, wherein the high-speed signal line is a shielded signal cable.
5. The wake-up device of the vehicular display screen according to claim 1, wherein the wake-up device comprises N sets of the high-speed signal lines; wherein N is more than or equal to 1 and is an integer.
6. The wake-up device for the vehicle-mounted display screen according to claim 1, wherein the control module further comprises an encoder, a communication bus and a video transmission line;
the communication bus and the video transmission line are respectively connected between the controller and the encoder;
the controller transmits video content to the encoder through the video transmission line;
the encoder is used for encoding the video content and transmitting the video content to the decoder through the high-speed signal line;
the decoder is used for decoding the encoded video content.
7. The wake-up device for a vehicle-mounted display screen of claim 6, wherein the encoder comprises a serializer and the decoder comprises a decoder.
8. A method for waking up a vehicle-mounted display screen, wherein the method is implemented by using the device for waking up the vehicle-mounted display screen of any one of claims 1 to 7, and the method comprises the following steps:
the controller sends a direct current control signal to a first signal input end of the power supply enabling module through the high-speed signal wire;
the power supply enabling module outputs a high level when the first signal input end is a high level and the second signal input end is a low level so as to start the power supply module to wake up the vehicle-mounted display screen;
the control module is also used for acquiring the level state of a GPIO enabling end of the decoder and stopping sending the direct current control signal when the level state is a high level;
and the power supply enabling module outputs a high level when the second signal input end inputs a high level and the first signal input end is a low level, and the power supply module is continuously started to maintain the work of the vehicle-mounted display screen.
9. The method for waking up the vehicle-mounted display screen according to claim 8, further comprising:
and the control module repeatedly acquires the level state for a set number of times when the level state of the GPIO enabling end of the decoder is a low level, until the acquisition is stopped when the level state is a high level.
10. A vehicle, characterized in that it comprises a wake-up unit of an on-board display screen according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010135824.5A CN111204297A (en) | 2020-03-02 | 2020-03-02 | Awakening method and device for vehicle-mounted display screen and vehicle |
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| CN202010135824.5A CN111204297A (en) | 2020-03-02 | 2020-03-02 | Awakening method and device for vehicle-mounted display screen and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111942154A (en) * | 2020-07-28 | 2020-11-17 | 广州汽车集团股份有限公司 | Wake-up device for battery management system and vehicle |
| CN115202602A (en) * | 2022-09-14 | 2022-10-18 | 湖北芯擎科技有限公司 | Display screen wake-up circuit |
-
2020
- 2020-03-02 CN CN202010135824.5A patent/CN111204297A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111942154A (en) * | 2020-07-28 | 2020-11-17 | 广州汽车集团股份有限公司 | Wake-up device for battery management system and vehicle |
| CN111942154B (en) * | 2020-07-28 | 2022-03-08 | 广汽埃安新能源汽车有限公司 | Wake-up device for battery management system and vehicle |
| 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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