CN112339679B - Vehicle-mounted display control system, method, terminal and vehicle - Google Patents
Vehicle-mounted display control system, method, terminal and vehicle Download PDFInfo
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- CN112339679B CN112339679B CN201910733150.6A CN201910733150A CN112339679B CN 112339679 B CN112339679 B CN 112339679B CN 201910733150 A CN201910733150 A CN 201910733150A CN 112339679 B CN112339679 B CN 112339679B
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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
- B60R16/023—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 transmission of signals between vehicle parts or subsystems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
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Abstract
The invention discloses a vehicle-mounted display control system, which comprises: a display controller and a serializer; the serializer comprises at least two voltage control oscillators, a voltage control oscillator and a frequency control unit, wherein the voltage control oscillators are used for providing corresponding voltage control voltages for the selected voltage control oscillator according to a preset reference frequency so that the selected voltage control oscillator works under a corresponding normal working frequency according to the voltage control voltages; the working frequency ranges of the at least two voltage control oscillators at the same temperature are different from each other; the display controller is used for selecting a corresponding voltage control oscillator for the serializer according to the acquired current environment temperature of the environment where the vehicle is located; the operating frequency range of the currently selected vco at the current temperature includes the reference frequency. The invention also discloses a vehicle-mounted display control method, a terminal and a vehicle. By adopting the embodiment of the invention, the problem of abnormal display of the vehicle-mounted display terminal can be avoided by optimizing the control strategy in the process of environment temperature change.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle-mounted display control system, a method, a terminal and a vehicle.
Background
With the rapid development of vehicle-mounted technology, the original stricter requirements of vehicle-mounted terminal products on the working temperature are, and the vehicle-mounted terminal products are generally required to normally work at the temperature between-30 ℃ and 75 ℃. The current vehicle navigation product has two schemes: one is the integrated machine scheme of host computer and display screen integration, the host computer transmits RGB video signal to the display screen to carry on the direct display through the winding displacement; the other is a split machine scheme with a host and a display screen separated from each other, wherein a video signal of the host is transmitted to the display screen through an LVDS cable for video display, and the scheme specifically comprises the following steps: the display main control chip sends the video signal to the serializer for corresponding processing, the serializer transmits the processed video signal to the deserializer through the LVDS cable, and the deserializer sends the received video signal to the display screen for displaying after corresponding processing. Among them, the RGB signals transmitted in the all-in-one machine scheme are easily interfered, so the bus cable can only be very short, usually within 10 cm. The LVDS signal of the split machine scheme has strong anti-interference capability, and the transmission cable can reach several meters. In addition, because the host and the display screen of the split machine scheme are separated due to the limitation of the vehicle space, the split machine scheme is more flexible to install, and the split machine scheme is basically adopted in the market.
However, in the process of rapid change of the environmental temperature, the display screen in the split computer scheme is easy to have abnormal display phenomena such as screen splash, etc. because: the output frequency of the voltage control oscillator in the serializer needs to be kept in a certain frequency range, and the display work of the display screen can be guaranteed to be normal, but the output frequency of the voltage control oscillator can be affected by the change of the ambient temperature, when the ambient temperature changes greatly, the adjustment range of the output frequency of the voltage control oscillator by the serializer can be exceeded, so that the output frequency of the voltage air control oscillator can not be kept in the preset range any more, and the display of the vehicle-mounted display screen is abnormal. In order to enable the vehicle-mounted display terminal to recover normal operation after abnormal display occurs, the current method comprises the following steps: and regularly detecting whether the register related to the serializer or the deserializer has errors, and if so, resetting the serializer or the deserializer so as to enable the display of the vehicle-mounted display terminal to be normal. The conventional method for regularly detecting the serializer or the deserializer has certain delay, and cannot solve the problem of abnormal display of the vehicle-mounted display terminal in time. In addition, in the resetting process of the serializer or the deserializer, the display screen can flash instantly and then recover to be normal, and the user experience is poor.
Disclosure of Invention
The embodiment of the invention aims to provide a vehicle-mounted display control system, a vehicle-mounted display control method, a vehicle-mounted display control terminal and a vehicle, which can avoid the problem of abnormal display of the vehicle-mounted display terminal and avoid the phenomenon of instantaneous flicker by optimizing a control strategy in the process of environment temperature change.
In order to achieve the above object, an embodiment of the present invention provides a vehicle-mounted display control system, including: a display controller and a serializer;
the serializer comprises at least two voltage control oscillators, wherein the voltage control oscillators are used for providing corresponding voltage control voltages for the selected voltage control oscillator according to a preset reference frequency, so that the selected voltage control oscillator works under a corresponding normal working frequency according to the voltage control voltages; wherein, the working frequency ranges of at least two voltage control oscillators at the same temperature are different from each other;
the display controller is connected with the serializer and is used for selecting a corresponding voltage control oscillator for the serializer according to the acquired current environment temperature of the environment where the vehicle is located; wherein the currently selected operating frequency range of the voltage controlled oscillator at the current temperature includes the reference frequency.
Compared with the prior art, according to the vehicle-mounted display control system disclosed by the embodiment of the invention, the voltage control oscillator corresponding to the current environment temperature is selected for the serializer by the display controller according to the acquired current environment temperature of the environment where the vehicle is located, and the serializer provides the corresponding voltage control voltage for the selected voltage control oscillator according to the preset reference frequency, so that the selected voltage control oscillator works at the corresponding normal working frequency according to the voltage control voltage, and the problem of abnormal display can be avoided. Therefore, in the process of the change of the environmental temperature, the embodiment of the invention can avoid the problem of abnormal display of the vehicle-mounted display terminal (which can also avoid the problem that the abnormal display cannot be solved in time) and avoid the phenomenon of instantaneous flicker by optimizing the control strategy.
As an improvement of the above, the display controller is specifically configured to:
when the current environment temperature of the environment where the vehicle is located is detected to exceed a preset high-temperature threshold, setting a voltage-controlled voltage corresponding to the high-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
when the current environment temperature of the acquired environment where the vehicle is located is detected to be lower than a preset low-temperature threshold, setting a voltage-controlled voltage corresponding to the low-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
wherein the corresponding relationship between the set voltage-controlled voltage and the selected voltage-controlled oscillator is preset.
As an improvement of the scheme, the high temperature threshold is 60 ℃, and the low temperature threshold is-20 ℃.
As an improvement of the above scheme, the vehicle-mounted display control system further comprises a temperature sensor; the temperature sensor is connected with the display controller and used for collecting the current environment temperature of the environment where the vehicle is located and sending the current environment temperature to the display controller.
As an improvement of the above scheme, when the vehicle-mounted display control system is powered on, the display controller is further configured to select a corresponding voltage-controlled oscillator for the serializer according to a preset initial temperature.
In order to achieve the above object, an embodiment of the present invention further provides a vehicle-mounted display control method, including:
selecting a corresponding voltage control oscillator for a serializer according to the acquired current environment temperature of the environment where the vehicle is located, so that the serializer provides a corresponding voltage control voltage for the selected voltage control oscillator according to a preset reference frequency, and the selected voltage control oscillator works at a corresponding normal working frequency according to the voltage control voltage;
the serializer comprises at least two voltage control oscillators, wherein the working frequency ranges of the at least two voltage control oscillators at the same temperature are different from each other; and the operating frequency range of the voltage controlled oscillator currently selected at the current temperature includes the reference frequency.
Compared with the prior art, according to the vehicle-mounted display control method disclosed by the embodiment of the invention, the voltage control oscillator corresponding to the current environment temperature is selected for the serializer according to the acquired current environment temperature of the environment where the vehicle is located, and the serializer provides the corresponding voltage control voltage for the selected voltage control oscillator according to the preset reference frequency, so that the selected voltage control oscillator works at the corresponding normal working frequency according to the voltage control voltage, and the problem of abnormal display can be avoided. Therefore, in the process of the change of the environmental temperature, the embodiment of the invention can avoid the problem of abnormal display of the vehicle-mounted display terminal (which can also avoid the problem that the abnormal display cannot be solved in time) and avoid the phenomenon of instantaneous flicker by optimizing the control strategy.
As an improvement of the above scheme, the selecting a corresponding voltage controlled oscillator for the serializer according to the obtained current ambient temperature of the environment where the vehicle is located includes:
when the current environment temperature of the environment where the vehicle is located is detected to exceed a preset high-temperature threshold, setting a voltage-controlled voltage corresponding to the high-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
when the current environment temperature of the acquired environment where the vehicle is located is detected to be lower than a preset low-temperature threshold, setting a voltage-controlled voltage corresponding to the low-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
wherein the corresponding relationship between the set voltage-controlled voltage and the selected voltage-controlled oscillator is preset.
As an improvement of the above scheme, the current ambient temperature is acquired by a temperature sensor provided on the vehicle.
In order to achieve the above object, an embodiment of the present invention further provides a vehicle-mounted display terminal, where the vehicle-mounted display terminal includes a vehicle-mounted display device and the vehicle-mounted display control system in any of the above embodiments, and the vehicle-mounted display device is connected to the vehicle-mounted display control system.
In order to achieve the above object, an embodiment of the present invention further provides a vehicle, where the vehicle includes the vehicle-mounted display terminal described in the above embodiment.
Drawings
Fig. 1 is a schematic structural diagram of an in-vehicle display control system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a part of a serializer in the vehicle-mounted display control system according to an embodiment of the invention;
fig. 3 illustrates a variation relationship between voltage-controlled voltages and operating frequencies of different voltage oscillation controllers provided by an embodiment of the present invention;
fig. 4 is a flowchart of a vehicle-mounted display control method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a vehicle-mounted display terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of an in-vehicle display control system 10 according to an embodiment of the present invention is provided; the in-vehicle display control system 10 includes: a display controller 11 and a serializer 12.
The serializer 12 includes at least two voltage controlled oscillators 121 (e.g., 1211-121 n in fig. 1) for providing a corresponding voltage controlled voltage to a selected voltage controlled oscillator 121 according to a preset reference frequency, so that the selected voltage controlled oscillator 121 operates at a corresponding normal operating frequency (the normal operating frequency indicates that the current operating frequency is normal, and optionally, the normal operating frequency is the same as or close to the reference frequency) according to the voltage controlled voltage; wherein, at least two of the voltage controlled oscillators 121 have different operating frequency ranges at the same temperature.
The display controller 11 is connected with the serializer 12, and is configured to select a corresponding voltage controlled oscillator 121 for the serializer 12 according to the acquired current ambient temperature of the environment where the vehicle is located; wherein the currently selected operating frequency range of the voltage controlled oscillator 121 at the current temperature includes the reference frequency.
Alternatively, fig. 2 may be referred to for a partial structural schematic of the serializer 12. The serializer 12 includes at least two voltage controlled oscillators 121 (VCOs), a phase frequency comparator 122, and a loop filter 123; the voltage controlled oscillator 121 is a device that outputs different output frequencies fo according to input different voltage controlled voltages Vr; for example, the voltage controlled oscillator 121 may use an LC circuit to generate oscillation, where the capacitor C is a varactor diode, so that different capacitance values can be generated by the variation of the input voltage, and finally different output frequencies can be generated; the phase frequency comparator 122 compares a reference frequency fr preset by the serializer 12 with an output frequency fo of the voltage controlled oscillator 121, thereby generating an error signal PD (alternating voltage signal); the loop filter 123 converts the error signal PD into a dc voltage, i.e., a voltage-controlled voltage Vr, using a low-pass filter.
When the serializer 12 starts to operate, because there is a phase difference between the two signals (the reference frequency fr and the output frequency fo) input to the phase frequency comparator 122, the phase frequency comparator 122 outputs the error signal PD, which is acted by the loop filter 123 to output the voltage-controlled voltage Vr to control the VCO, so that the output frequency fo is consistent with the reference frequency fr. During the operation of the serializer 12, the VCO decreases with temperature due to the temperature characteristic of the semiconductor oscillation circuit, and the output frequency fo thereof becomes larger. If fo is increased, the serializer 12 reduces Vr to reduce fo so as to keep outputting the same fo, thereby keeping the same output frequency. Conversely, as the temperature increases, fo will decrease and Vr will increase to increase fo. When the temperature changes greatly, for example, from +75 ℃ to-30 ℃, and the output voltage-controlled voltage Vr changes greatly due to the excessive temperature change, the situation that the voltage-controlled voltage Vr of the VCO exceeds the range may occur, as shown in fig. 3, when the ambient temperature decreases from +75 ℃ to-30 ℃, the output frequency fo of the VCO1 increases, and in order to keep outputting the same fo, the serializer 12 needs to reduce fo by reducing Vr, and at this time, the voltage-controlled voltage Vr of the VCO1 changes from point a to point B, and the point B is beyond the voltage-controlled voltage range of the VCO1, and at this time, the serializer 12 outputs an abnormality, which may cause the display to generate an abnormality such as a screen.
In the embodiment of the present invention, in order to avoid the situation that the voltage-controlled voltage of the VCO exceeds the range due to an excessive temperature change, at least two VCOs with different operating frequency ranges at the same temperature are arranged in the serializer 12, so that the VCO corresponding to the current ambient temperature is selected for the serializer 12 according to the obtained current ambient temperature of the environment where the vehicle is located, and it is ensured that the voltage-controlled voltage of the VCO is still within the operating range thereof under the condition that the ambient temperature is drastically changed, so that the serializer 12 can normally operate when the temperature change is excessive, and abnormal display phenomena such as screen splash and the like on a display screen in the vehicle-mounted display device are prevented.
Further, the display controller 11 is preset with a corresponding relationship among the current ambient temperature, the VCO, the operating frequency range, and the voltage control voltage, and may refer to table 1. It should be noted that the data given in table 1 is only used as reference data for exemplifying the embodiment of the present invention, and in an actual situation, values of the data in table 1 are determined according to an actual situation, which is not specifically limited by the present invention.
TABLE 1 corresponding relationship between the current ambient temperature, VCO, operating frequency range, and voltage control voltage
| T(℃) | VCO | Operating frequency range fo (GHz) | Voltage-controlled voltage Vr (V) corresponding to current temperature |
| -30 | VCO1 | 1.6～2.6 | 0.4 |
| -10 | VCO2 | 1.4～2.4 | 0.6 |
| 10 | VCO3 | 1.3～2.3 | 0.8 |
| 30 | VCO4 | 1.2～2.2 | 1.0 |
| 50 | VCO5 | 1.1～2.1 | 1.2 |
| 70 | VCO6 | 1.0～2.0 | 1.4 |
Illustratively, assume that the reference frequency is 1.8 GHz. When the current environment temperature of the environment where the vehicle is located, which is acquired by the display controller 11, is-30 ℃, according to the corresponding relationship in table 1, the voltage controlled oscillator 121 corresponding to the serializer 12 is selected as the VCO1, and the operating frequency of the VCO1 is 1.6 to 2.6GHz when the voltage controlled voltage Vr is 0.4V. When the current environment temperature changes from-30 ℃ to 70 ℃, if the VCO1 is still used, the VCO1 has a large change in fo due to an excessive temperature rise (which may be reduced from 2.0GHz to 1.6GHz under the same voltage control voltage), so that the output frequency fo is consistent with the reference frequency fr, and the voltage control voltage Vr has a large change, and the serializer 12 outputs an abnormal output at this time. Therefore, when the current ambient temperature changes from-30 ℃ to 70 ℃, the display controller 11 selects the corresponding voltage controlled oscillator 121 as the VCO6 for the serializer 12 according to the corresponding relationship in table 1, the operating frequency of the VCO6 is 1.0 to 2.0GHz when the voltage controlled voltage Vr is 1.4V, and the VCO6 can still normally operate when the current ambient temperature is 70 ℃, so that the serializer 12 can normally operate when the temperature change is too large, and abnormal display phenomena such as screen splash and the like on a display screen in the vehicle-mounted display device are prevented.
Optionally, the display controller 11 is specifically configured to:
when the current environment temperature of the acquired environment where the vehicle is located is detected to exceed a preset high-temperature threshold, setting a voltage-controlled voltage corresponding to the high-temperature threshold, and selecting a corresponding voltage-controlled oscillator 121 for the serializer 12 according to the set voltage-controlled voltage;
when the current environment temperature of the acquired environment where the vehicle is located is detected to be lower than a preset low-temperature threshold, setting a voltage-controlled voltage corresponding to the low-temperature threshold, and selecting a corresponding voltage-controlled oscillator 121 for the serializer 12 according to the set voltage-controlled voltage;
the correspondence between the set voltage-controlled voltage and the selected voltage-controlled oscillator 121 is preset.
That is, when the current ambient temperature exceeds the high temperature threshold, the current voltage-controlled oscillator 121 may be in an abnormal operating state due to an excessively high temperature, so that the display screen displays an abnormal state, and at this time, the display controller 11 reselects the voltage-controlled oscillator 121 corresponding to the high temperature threshold for the serializer 12; or, when the current ambient temperature is lower than the low temperature threshold, the current voltage-controlled oscillator 121 may be in an abnormal operating state due to too low temperature, so that the display of the display screen is abnormal, and at this time, the display controller 11 reselects the voltage-controlled oscillator 121 corresponding to the low temperature threshold for the serializer 12. When the current ambient temperature is not higher than the high temperature threshold and not lower than the low temperature threshold, the voltage controlled oscillator 121 normally operates, and the display screen normally displays the current ambient temperature.
Optionally, the high temperature threshold is 60 degrees celsius, and the low temperature threshold is-20 degrees celsius. It should be noted that the selection of the high temperature threshold and the low temperature threshold may be set according to actual situations, and the present invention is not limited to this.
Optionally, the current ambient temperature obtained by the display controller 11 may be obtained by a temperature measuring device installed at another part of the vehicle, or obtained by networking to obtain the current weather temperature in real time.
Further, the current ambient temperature acquired by the display controller 11 may also be acquired by a temperature sensor 13 installed in the vehicle-mounted display control system 10, and the temperature sensor 13 is connected to the display controller 11 and is configured to acquire the current ambient temperature of the environment where the vehicle is located and send the current ambient temperature to the display controller 11. Optionally, the temperature sensor 13 includes at least one of a thermocouple and a thermistor.
Optionally, when the vehicle-mounted display control system 10 is powered on, the display controller 11 is further configured to select a corresponding voltage-controlled oscillator 121 for the serializer 12 according to a preset initial temperature. For example, the initial temperature may default to 20 ℃. When the vehicle-mounted display control system 10 is powered on, the serializer 12 is initialized, the voltage oscillation controller 121 corresponding to 20 ℃ is selected by default, then, the display controller 11 obtains the current environment temperature, and selects the corresponding voltage control oscillator 121 for the serializer 12 according to the current environment temperature.
Compared with the prior art, in the vehicle-mounted display control system 10 disclosed in the embodiment of the present invention, the display controller 11 selects the voltage-controlled oscillator 121 corresponding to the current ambient temperature for the serializer 12 according to the acquired current ambient temperature of the environment where the vehicle is located, so as to ensure that the voltage-controlled voltage of the selected voltage-controlled oscillator 121 is still within the working range thereof under the condition of drastic change of the ambient temperature, so that the selected voltage-controlled oscillator 121 can work at the corresponding normal working frequency, and thus the problem of abnormal display can be avoided. Therefore, in the process of the change of the environmental temperature, the embodiment of the invention can avoid the problem of abnormal display of the vehicle-mounted display terminal (which can also avoid the problem that the abnormal display cannot be solved in time) and avoid the phenomenon of instantaneous flicker by optimizing the control strategy.
Another embodiment of the present invention provides a vehicle-mounted display control method, including:
and S1, selecting a corresponding voltage control oscillator for the serializer according to the acquired current environment temperature of the environment where the vehicle is located, so that the serializer provides a corresponding voltage control voltage for the selected voltage control oscillator according to a preset reference frequency, and the selected voltage control oscillator works at a corresponding normal working frequency according to the voltage control voltage.
The serializer comprises at least two voltage control oscillators, wherein the working frequency ranges of the at least two voltage control oscillators at the same temperature are different from each other; and the operating frequency range of the voltage controlled oscillator currently selected at the current temperature includes the reference frequency.
Optionally, referring to fig. 4, the step S1 includes:
s11, when the current environment temperature of the acquired environment where the vehicle is located is detected to exceed a preset high-temperature threshold, setting a voltage-controlled voltage corresponding to the high-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
s12, when the current environment temperature of the acquired environment where the vehicle is located is detected to be lower than a preset low-temperature threshold value, setting a voltage-controlled voltage corresponding to the low-temperature threshold value, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
wherein the corresponding relationship between the set voltage-controlled voltage and the selected voltage-controlled oscillator is preset.
Optionally, the current ambient temperature is collected by a temperature sensor provided on the vehicle.
Optionally, the method further includes: and when the vehicle-mounted display control system is powered on, selecting a corresponding voltage control oscillator for the serializer according to a preset initial temperature.
For a specific working process of the vehicle-mounted display control method, please refer to the working process of each module in the vehicle-mounted display control system 10 in the above embodiment, which is not described herein again.
Compared with the prior art, according to the vehicle-mounted display control method disclosed by the embodiment of the invention, the voltage control oscillator corresponding to the current environment temperature is selected for the serializer according to the acquired current environment temperature of the environment where the vehicle is located, and the serializer provides the corresponding voltage control voltage for the selected voltage control oscillator according to the preset reference frequency, so that the selected voltage control oscillator works at the corresponding normal working frequency according to the voltage control voltage, and the problem of abnormal display can be avoided. Therefore, in the process of the change of the environmental temperature, the embodiment of the invention can avoid the problem of abnormal display of the vehicle-mounted display terminal (which can also avoid the problem that the abnormal display cannot be solved in time) and avoid the phenomenon of instantaneous flicker by optimizing the control strategy.
Another embodiment of the present invention provides a vehicle-mounted display terminal, referring to fig. 5, fig. 5 is a schematic structural diagram of the vehicle-mounted display terminal provided in an embodiment of the present invention; the vehicle-mounted display terminal comprises a vehicle-mounted display device 20 and the vehicle-mounted display control system 10 in the embodiment, wherein the vehicle-mounted display device 20 is connected with the vehicle-mounted display control system 10.
Optionally, the vehicle-mounted display device 20 includes a deserializer 21 and a display screen 22, and the deserializer 21 is connected with the serializer 12 in the vehicle-mounted display control system 10 through an LVDS cable. The display controller 11 sends the video signal to the serializer 12 for corresponding processing, the serializer 12 transmits the processed video signal to the deserializer 21 through the LVDS cable, and the deserializer 21 sends the received video signal to the display screen 22 for displaying after corresponding processing.
For a specific working process of the vehicle-mounted display control system 10, please refer to the working process of the vehicle-mounted display control system 10 described in the foregoing embodiment, which is not described herein again.
Compared with the prior art, in the vehicle-mounted display terminal disclosed in the embodiment of the present invention, the vehicle-mounted display control system 10 selects the voltage controlled oscillator 121 corresponding to the current environment temperature for the serializer 12 according to the acquired current environment temperature of the environment where the vehicle is located, and the serializer 12 provides the corresponding voltage controlled voltage for the selected voltage controlled oscillator 121 according to the preset reference frequency, so that the selected voltage controlled oscillator 121 operates at the corresponding normal operating frequency according to the voltage controlled voltage, thereby avoiding the problem of abnormal display. Therefore, in the process of the change of the environmental temperature, the embodiment of the invention can avoid the problem of abnormal display of the vehicle-mounted display terminal (which can also avoid the problem that the abnormal display cannot be solved in time) and avoid the phenomenon of instantaneous flicker by optimizing the control strategy.
Another embodiment of the present invention provides a vehicle, which includes the vehicle-mounted display terminal described in the above embodiment. For a specific working process of the vehicle-mounted display terminal, please refer to the working process of the vehicle-mounted display terminal described in the above embodiment, which is not described herein again.
Compared with the prior art, according to the vehicle disclosed by the embodiment of the invention, the voltage control oscillator 121 corresponding to the current environment temperature is selected for the serializer 12 according to the acquired current environment temperature of the environment where the vehicle is located, and the serializer 12 provides the corresponding voltage control voltage for the selected voltage control oscillator 121 according to the preset reference frequency, so that the selected voltage control oscillator 121 works at the corresponding normal working frequency according to the voltage control voltage, and the problem of abnormal display can be avoided. Therefore, in the process of the change of the environmental temperature, the embodiment of the invention can avoid the problem of abnormal display of the vehicle-mounted display terminal (which can also avoid the problem that the abnormal display cannot be solved in time) and avoid the phenomenon of instantaneous flicker by optimizing the control strategy.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An in-vehicle display control system, characterized by comprising: a display controller and a serializer;
the serializer comprises at least two voltage control oscillators, wherein the voltage control oscillators are used for providing corresponding voltage control voltages for the selected voltage control oscillator according to a preset reference frequency, so that the selected voltage control oscillator works under a corresponding normal working frequency according to the voltage control voltages; wherein, the working frequency ranges of at least two voltage control oscillators at the same temperature are different from each other;
the display controller is connected with the serializer and is used for selecting a corresponding voltage control oscillator for the serializer according to the acquired current environment temperature of the environment where the vehicle is located; when the vehicle-mounted display control system is powered on, the vehicle-mounted display control system is further used for selecting a corresponding voltage control oscillator for the serializer according to a preset initial temperature; wherein the currently selected operating frequency range of the voltage controlled oscillator at the current temperature includes the reference frequency.
2. The vehicle-mounted display control system of claim 1, wherein the display controller is specifically configured to:
when the current environment temperature of the environment where the vehicle is located is detected to exceed a preset high-temperature threshold, setting a voltage-controlled voltage corresponding to the high-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
when the current environment temperature of the acquired environment where the vehicle is located is detected to be lower than a preset low-temperature threshold, setting a voltage-controlled voltage corresponding to the low-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
wherein the corresponding relationship between the set voltage-controlled voltage and the selected voltage-controlled oscillator is preset.
3. The on-board display control system of claim 2, wherein the high temperature threshold is 60 degrees celsius and the low temperature threshold is-20 degrees celsius.
4. The in-vehicle display control system according to claim 1, further comprising a temperature sensor; the temperature sensor is connected with the display controller and used for collecting the current environment temperature of the environment where the vehicle is located and sending the current environment temperature to the display controller.
5. A vehicle-mounted display control method is characterized by comprising the following steps:
when the vehicle-mounted display control system is powered on, selecting a corresponding voltage control oscillator for the serializer according to a preset initial temperature;
selecting a corresponding voltage control oscillator for a serializer according to the acquired current environment temperature of the environment where the vehicle is located, so that the serializer provides a corresponding voltage control voltage for the selected voltage control oscillator according to a preset reference frequency, and the selected voltage control oscillator works at a corresponding normal working frequency according to the voltage control voltage;
the serializer comprises at least two voltage control oscillators, wherein the working frequency ranges of the at least two voltage control oscillators at the same temperature are different from each other; and the operating frequency range of the voltage controlled oscillator currently selected at the current temperature includes the reference frequency.
6. The vehicle-mounted display control method according to claim 5, wherein the selecting a corresponding voltage-controlled oscillator for the serializer according to the acquired current ambient temperature of the environment in which the vehicle is located includes:
when the current environment temperature of the environment where the vehicle is located is detected to exceed a preset high-temperature threshold, setting a voltage-controlled voltage corresponding to the high-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
when the current environment temperature of the acquired environment where the vehicle is located is detected to be lower than a preset low-temperature threshold, setting a voltage-controlled voltage corresponding to the low-temperature threshold, and selecting a corresponding voltage-controlled oscillator for the serializer according to the set voltage-controlled voltage;
wherein the corresponding relationship between the set voltage-controlled voltage and the selected voltage-controlled oscillator is preset.
7. The on-vehicle display control method according to claim 5, characterized in that the current ambient temperature is acquired by a temperature sensor provided on the vehicle.
8. A vehicle-mounted display terminal is characterized by comprising a vehicle-mounted display device and the vehicle-mounted display control system of any one of the claims 1-4, wherein the vehicle-mounted display device is connected with the vehicle-mounted display control system.
9. A vehicle characterized by comprising the in-vehicle display terminal of claim 8.
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| CN2650392Y (en) * | 2003-10-16 | 2004-10-20 | 张连琴 | Full-digital temperature-compensating chip oscillator monolithic integrated block |
| CN201535812U (en) * | 2009-07-16 | 2010-07-28 | 广东大普通信技术有限公司 | Automatic test system for temperature compensated crystal oscillators |
| EP2388921B1 (en) * | 2010-05-21 | 2013-07-17 | Nxp B.V. | Integrated circuits with frequency generating circuits |
| JP6680121B2 (en) * | 2016-01-06 | 2020-04-15 | セイコーエプソン株式会社 | Circuit devices, oscillators, electronic devices and mobile units |
| JP6834579B2 (en) * | 2017-02-23 | 2021-02-24 | セイコーエプソン株式会社 | Manufacturing methods for circuit devices, oscillators, electronic devices, mobiles and circuit devices |
| CN108649902B (en) * | 2018-05-14 | 2024-01-23 | 成都中宇微芯科技有限公司 | Temperature compensation voltage-controlled oscillator and compensation method |
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