CN110288935B - Monitoring method and monitoring device for vehicle-mounted liquid crystal display backlight source - Google Patents

Monitoring method and monitoring device for vehicle-mounted liquid crystal display backlight source Download PDF

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CN110288935B
CN110288935B CN201910563673.0A CN201910563673A CN110288935B CN 110288935 B CN110288935 B CN 110288935B CN 201910563673 A CN201910563673 A CN 201910563673A CN 110288935 B CN110288935 B CN 110288935B
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vehicle
liquid crystal
crystal display
backlight source
mounted liquid
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CN110288935A (en
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韩亮
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/048—Preventing or counteracting the effects of ageing using evaluation of the usage time

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Abstract

The invention relates to a monitoring method and a monitoring device for a backlight source of a vehicle-mounted liquid crystal display screen, wherein the method comprises the following steps: acquiring the service duration, the brightness information and the actual power value of the backlight source of the vehicle-mounted liquid crystal display screen; determining a corresponding calibration power value in a data calibration table of the vehicle-mounted liquid crystal display screen backlight source according to the service duration and the brightness information of the vehicle-mounted liquid crystal display screen backlight source, wherein the data calibration table is used for calibrating power calibration values which the backlight sources with different service durations should have when working with corresponding brightness information; and comparing the actual power value with the calibrated power value to determine whether the backlight source of the vehicle-mounted liquid crystal display screen is abnormal. According to the embodiment of the invention, the working condition of the vehicle-mounted liquid crystal display backlight source is monitored by detecting the power parameter of the vehicle-mounted liquid crystal display backlight source, the fault of the liquid crystal display screen caused by the aging of the vehicle-mounted liquid crystal display backlight source can be effectively avoided, the influence on the driving operation of a driver is avoided, and the driving safety is improved.

Description

Monitoring method and monitoring device for vehicle-mounted liquid crystal display backlight source
Technical Field
The invention relates to the technical field of intelligent automobiles, in particular to a method and a device for monitoring a backlight source of an on-vehicle liquid crystal display screen.
Background
With the development of automobile intellectualization in recent years, particularly the rapid development of new energy automobiles, the LCD on the vehicle becomes a very important electronic device on the automobile, and develops towards the directions of high resolution, large size (15.6 inches), wide viewing angle, lightness and thinness and low power consumption, and more data can be applied to the LCD on the vehicle, for example, the LCD on the vehicle can be used as a virtual instrument panel and can also display entertainment audio and video information.
In the structural design of the liquid crystal display screen, the selection of the backlight source is very critical, and the selected backlight source determines the photoelectric parameters of the liquid crystal display screen, such as power consumption, brightness, color and the like, and also determines the characteristics of the liquid crystal display screen, such as service conditions, service life and the like. Currently common liquid crystal display backlight sources include electroluminescent light sources, linear light sources such as cold cathode fluorescent tubes (CCFLs), and backlight source types such as LEDs.
The service life of a vehicle is related to the age and mileage. Before the vehicle is scrapped, the service life of the vehicle generally exceeds 10 years, or the mileage of the vehicle generally reaches hundreds of thousands of kilometers. And as the service life of the vehicle-mounted liquid crystal display increases, the backlight source device of the vehicle-mounted liquid crystal display can be aged, the existing vehicle-mounted liquid crystal display backlight source cannot meet the requirement of the service life of the vehicle, and the probability of problems in vehicle service engineering is increased. Among the prior art, on-vehicle system can not monitor the vehicle-mounted liquid crystal display backlight, and the user can't predict the behaviour in service of vehicle-mounted liquid crystal display backlight in advance, probably appears the condition that vehicle-mounted liquid crystal display is black, can't show at any time, influences the control to the vehicle.
Disclosure of Invention
In order to solve the technical problem that the working condition of the vehicle-mounted liquid crystal display screen backlight source cannot be monitored, the invention provides a monitoring method and a monitoring device of the vehicle-mounted liquid crystal display screen backlight source.
The monitoring method of the vehicle-mounted liquid crystal display backlight source comprises the following steps:
acquiring the service duration, the brightness information and the actual power value of the backlight source of the vehicle-mounted liquid crystal display screen;
determining a corresponding calibration power value in a data calibration table of the vehicle-mounted liquid crystal display backlight source according to the obtained service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, wherein the data calibration table of the vehicle-mounted liquid crystal display backlight source is used for calibrating power calibration values which the vehicle-mounted liquid crystal display backlight sources with different service durations should have when working with corresponding brightness information;
and comparing the actual power value and the calibrated power value of the vehicle-mounted liquid crystal display screen backlight source to determine whether the vehicle-mounted liquid crystal display screen backlight source is abnormal.
Further, a plurality of data calibration tables of the vehicle-mounted liquid crystal display screen backlight source are set according to the aging rate of the vehicle-mounted liquid crystal display screen backlight source,
the calibration power values of the plurality of pieces of calibration parameter data in each data calibration table have a uniform value threshold or value fluctuation range,
along with the acceleration of the aging rate of the backlight source of the vehicle-mounted liquid crystal display screen, the numerical threshold value or the numerical fluctuation range of the calibration power value of the calibration parameter data in the corresponding data calibration table is increased.
Further, a data calibration table of the vehicle-mounted liquid crystal display backlight source is arranged according to the aging rate of the vehicle-mounted liquid crystal display backlight source,
and increasing the numerical threshold value or the numerical fluctuation range of the calibration power value in different calibration parameter data in the data calibration table along with the acceleration of the aging rate of the backlight source of the vehicle-mounted liquid crystal display screen.
Further, the monitoring method further comprises, before determining the corresponding calibration power value, the steps of:
establishing and storing a data calibration table of the vehicle-mounted liquid crystal display screen backlight source, and/or
And monitoring the service life of the vehicle-mounted liquid crystal display backlight source.
And further, according to the obtained service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, determining a calibration power value in calibration parameter data with the same or similar service duration and brightness information in a data calibration table of the vehicle-mounted liquid crystal display backlight source.
Further, controlling the backlight source of the vehicle-mounted liquid crystal display to emit light according to preset brightness information, acquiring the working time of the backlight source of the vehicle-mounted liquid crystal display in real time, and determining a calibration power value in calibration parameter data with the same or similar service time and brightness information in a data calibration table of the backlight source of the vehicle-mounted liquid crystal display; alternatively, the first and second electrodes may be,
when the preset service time of the vehicle-mounted liquid crystal display screen backlight source is reached, the monitoring of the vehicle-mounted liquid crystal display screen backlight source is carried out, so that the vehicle-mounted liquid crystal display screen backlight source emits light according to preset brightness information.
And further, comparing the actual power value and the calibration power value of the backlight source of the vehicle-mounted liquid crystal display screen, and if the actual power value of the backlight source of the vehicle-mounted liquid crystal display screen is in the calibration power value range, comparing the current measurement value and/or the voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen with the calibration current value and the calibration voltage value corresponding to the calibration power value determined in the data calibration table, and determining whether the backlight source of the vehicle-mounted liquid crystal display screen is abnormal or not.
Further, firstly, comparing the voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen with the calibration voltage value corresponding to the calibration power value determined in the data calibration table, and when the voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen is within the calibration voltage value range, comparing the current measurement value of the backlight source of the vehicle-mounted liquid crystal display screen with the calibration current value corresponding to the calibration power value determined in the data calibration table.
On the other hand, the monitoring device of the vehicle-mounted liquid crystal display backlight comprises a voltage detection unit, a current detection unit and a monitoring unit, wherein the voltage detection unit and the current detection unit are respectively connected with the monitoring unit,
the voltage detection unit detects a voltage measured value of the vehicle-mounted liquid crystal display backlight source, and the current detection unit detects a current measured value of the vehicle-mounted liquid crystal display backlight source;
the monitoring unit acquires the service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, and obtains the actual power value of the vehicle-mounted liquid crystal display backlight source according to the voltage measurement value and the current measurement value; determining a corresponding calibration power value in a data calibration table of the vehicle-mounted liquid crystal display backlight source according to the obtained service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, wherein the data calibration table of the vehicle-mounted liquid crystal display backlight source is used for calibrating power calibration values which the vehicle-mounted liquid crystal display backlight sources with different service durations should have when working with corresponding brightness information; and comparing the actual power value and the calibrated power value of the vehicle-mounted liquid crystal display screen backlight source to determine whether the vehicle-mounted liquid crystal display screen backlight source is abnormal.
Further, the monitoring device of the vehicle-mounted liquid crystal display screen backlight source also comprises a storage unit and a timing unit,
the storage unit stores a data calibration table of the vehicle-mounted liquid crystal display backlight source,
the timing unit is used for timing the service life of the backlight source of the vehicle-mounted liquid crystal display screen and storing the service life data in the storage unit.
Further, a plurality of data calibration tables of the vehicle-mounted liquid crystal display backlight source are set according to the aging rate of the vehicle-mounted liquid crystal display backlight source,
the calibration power values of the calibration parameter data in each data calibration table have a uniform value threshold or value fluctuation range,
along with the acceleration of the aging rate of the backlight source of the vehicle-mounted liquid crystal display screen, the numerical threshold value or the numerical fluctuation range of the calibration power value of the calibration parameter data in the corresponding data calibration table is increased.
Further, the monitoring unit controls the backlight source of the vehicle-mounted liquid crystal display screen to emit light according to preset brightness information, obtains the working time length of the backlight source of the vehicle-mounted liquid crystal display screen in real time, and determines a calibration power value in calibration parameter data with the same or similar service time length and brightness information in a data calibration table of the backlight source of the vehicle-mounted liquid crystal display screen; alternatively, the first and second liquid crystal display panels may be,
when the preset use time of reaching the vehicle-mounted liquid crystal display backlight source, the monitoring unit monitors the vehicle-mounted liquid crystal display backlight source, so that the vehicle-mounted liquid crystal display backlight source emits light with preset brightness information.
Further, the monitoring unit compares the actual power value and the calibration power value of the vehicle-mounted liquid crystal display backlight source, and if the actual power value of the vehicle-mounted liquid crystal display backlight source is within the calibration power value range, the monitoring unit compares the current measurement value and/or the voltage measurement value of the vehicle-mounted liquid crystal display backlight source with the calibration current value and the calibration voltage value corresponding to the calibration power value determined in the data calibration table, and determines whether the vehicle-mounted liquid crystal display backlight source is abnormal or not.
Further, the monitoring unit compares a voltage measurement value of the vehicle-mounted liquid crystal display backlight source with a calibration voltage value corresponding to the calibration power value determined in the data calibration table, and when the voltage measurement value of the vehicle-mounted liquid crystal display backlight source is within the calibration voltage value range, the monitoring unit compares a current measurement value of the vehicle-mounted liquid crystal display backlight source with a calibration current value corresponding to the calibration power value determined in the data calibration table.
Further, the voltage detection unit comprises an operational amplifier, a capacitor, a change-over switch, a first resistor Ra and a second resistor Rb, wherein the equidirectional input end of the operational amplifier is grounded, the reverse input end of the operational amplifier can be respectively connected to the first end of the first resistor Ra and the first end of the second resistor Rb through the change-over switch, the second end of the first resistor Ra is connected with the voltage Vin of the vehicle liquid crystal display backlight source, the second end of the second resistor Vb is connected with the reference voltage Vref, the capacitor is connected between the reverse input end and the output end Vout of the operational amplifier,
when the voltage detection unit detects the voltage of the vehicle-mounted liquid crystal display screen backlight source, the reversing input end of the operational amplifier is connected to the first resistor Ra by the change-over switch, the voltage Vin of the vehicle-mounted liquid crystal display screen backlight source charges the integrating circuit, and the charging time is Tu; then, the switch connects the inverting input terminal of the operational amplifier to the second resistor Rb, the integrating circuit discharges with the reference voltage Vref, and the discharge time is Td, then the voltage Vin of the vehicle-mounted liquid crystal display backlight source is:
Vin＝|-Vref((Ra/Rb)·(td/tu))|。
the invention has the beneficial effects that: the monitoring method and the monitoring device for the vehicle-mounted liquid crystal display screen backlight source provided by the embodiment of the invention realize the monitoring of the working condition of the vehicle-mounted liquid crystal display screen backlight source by detecting the current, voltage and power parameters of the vehicle-mounted liquid crystal display screen backlight source, can effectively avoid the liquid crystal display screen faults (such as black screen) caused by the aging of the vehicle-mounted liquid crystal display screen backlight source and the abnormal circuit operation, avoid the influence on the driving operation of a driver and improve the driving safety.
Drawings
Fig. 1 is a flowchart of a method for monitoring a backlight source of an on-vehicle liquid crystal display according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for monitoring a backlight of an on-board display according to an embodiment of the present invention;
fig. 3 is a block diagram of a monitoring device for a backlight source of an on-vehicle liquid crystal display according to an embodiment of the present invention;
fig. 4a and 4b are circuit diagrams of a voltage detection unit of a monitoring device for a vehicle-mounted liquid crystal display backlight source according to an embodiment of the present invention and characteristic curves thereof;
fig. 5 is a circuit diagram of a current detection unit of a monitoring device for a vehicle-mounted liquid crystal display backlight according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. Those skilled in the art will appreciate that the present invention is not limited to the figures and the following examples.
The embodiment of the invention monitors the working condition of the vehicle-mounted liquid crystal display screen backlight source by monitoring the power of the vehicle-mounted liquid crystal display screen backlight source.
Specifically, the vehicle-mounted liquid crystal display screen backlight sources have respective design life, the vehicle-mounted liquid crystal display screen backlight sources age along with the increase of the service time, the resistance of the backlight sources can gradually increase, and the power consumed by the backlight sources can increase in order to achieve the same brightness; however, in a certain service time, the consumed power of the same backlight is only related to the brightness of the backlight basically, is slightly influenced by other factors, and is not influenced by the ambient temperature (-40-85 ℃). Therefore, for the same backlight, a data calibration table between the brightness and the consumed power can be established in advance within a certain using time, and whether the backlight is in failure or not can be judged by looking up the table.
As shown in fig. 1, an embodiment of the present invention provides a method for monitoring a backlight source of an on-vehicle liquid crystal display, including the following steps:
s10: and establishing a data calibration table between the brightness information and the consumed power of the backlight source of the vehicle-mounted liquid crystal display screen.
And for the tested specific type of the vehicle-mounted liquid crystal display screen, establishing and storing a data calibration table between the brightness information and the consumed power of the backlight source of the vehicle-mounted liquid crystal display screen based on the aging degree of the vehicle-mounted liquid crystal display screen. The data calibration table of the vehicle-mounted liquid crystal display backlight source is a set of normal working condition parameter data of the vehicle-mounted liquid crystal display backlight source.
The data calibration table of the vehicle-mounted liquid crystal display backlight source comprises a plurality of calibration parameter data, and each calibration parameter data can comprise a rated voltage value, a rated current value, a use duration, brightness information, a calibration current value, a calibration voltage value and a calibration power value.
The rated voltage value and the rated current value are the rated power supply voltage value and the rated power supply current value of the tested specific type of vehicle-mounted liquid crystal display backlight source, such as 12V/100mA and 24V/200mA, if the tested specific type of vehicle-mounted liquid crystal display backlight source can work under different conditions of the rated power supply voltage value and the rated power supply current value, corresponding setting in the calibration parameter data is necessary, and if the tested specific type of vehicle-mounted liquid crystal display backlight source only works under a single condition of the rated power supply voltage value and the rated power supply current value, setting in the calibration parameter data is unnecessary.
The operating time of the actual emergence of the long for vehicle carried liquid crystal display backlight during operation can be timed by timing unit to the length of time is used in real-time storage in storage component, perhaps the length of time is used in the storage component to the update at vehicle carried liquid crystal display shutdown moment.
The brightness information may be the brightness level of the backlight source of the specific type of vehicle-mounted liquid crystal display to be tested, and may be set, for example, in a percentage of 0 to 100, or may be a specific brightness value (lumen).
The calibration current value and the calibration voltage value are based on the voltage value and the current value (the voltage value is related to the current value) when the backlight source of the vehicle-mounted liquid crystal display screen of the specific type to be tested emits light with corresponding brightness information under the normal working condition of applying the rated current value and the rated voltage value. And recording a voltage value and a current value of the tested specific type of vehicle-mounted liquid crystal display backlight source in each calibration parameter data when the backlight source emits light according to corresponding brightness information, wherein the calibration current value and the calibration voltage value can be a specific numerical value fluctuation interval or a specific numerical value.
The calibration power value is determined according to a calibration current value and a calibration voltage value, and is adaptive to the values of the calibration current value and the calibration voltage value, and the calibration power value can be a numerical value or a numerical value fluctuation interval.
Therefore, each calibration parameter data records a calibration current value and a calibration voltage value which should be possessed by the vehicle-mounted liquid crystal display screen when the vehicle-mounted liquid crystal display screen emits light with corresponding brightness information under the condition that rated current and voltage are applied to the backlight sources of the specific types with different service durations, and a calibration power value obtained based on the calibration current value and the calibration voltage value.
In table 1, a data calibration table (including some calibration parameter data) for a vehicle lcd backlight source at a voltage rating of 12V and a current rating of 100mA is shown for exemplary purposes:
Figure BDA0002108964800000061
TABLE 1
As can be seen from table 1, the same lcd backlight for a vehicle may have the same calibrated power value under different conditions, such as serial number 3 and serial number 20 in table 1.
Through analysis, for the vehicle-mounted liquid crystal display screen backlight source, under the condition that the service life is less than 5000 hours, the aging speed of the backlight source is very high and slow, under the premise that corresponding brightness information is certain, the actual power of the backlight source is basically unchanged, the power value change of the service life of less than 5000 hours can be ignored, or a smaller first numerical value fluctuation range can be set for the numerical value fluctuation interval of the calibrated power value in the calibration parameter data of the service life of less than 5000 hours, or a smaller first threshold value is set when the actual power value is compared with the numerical value of the calibrated power value subsequently; under the condition that the use duration is within 5000 + 10000 hours, the aging speed of the backlight source is accelerated, the actual power of the backlight source can be changed to a certain extent on the premise that the corresponding brightness information is certain, a second numerical value fluctuation range which is larger than a first numerical value fluctuation range can be set for a numerical value fluctuation interval of the calibration power value in the calibration parameter data of the use duration of 5000 + 10000 hours, or a second threshold which is larger than the first threshold is set when the actual power value is compared with the numerical value of the calibration power value subsequently; under the condition that the service duration is longer than 10000 hours, the aging speed of the backlight source is faster, the actual power of the backlight source is changed to a certain extent on the premise that the corresponding brightness information is certain, a third numerical value fluctuation range which is larger than a second numerical value fluctuation range can be set for a numerical value fluctuation interval of the calibration power value in the calibration parameter data with the service duration longer than 10000 hours, or a third threshold which is larger than a second threshold is set when the actual power value is compared with the numerical value of the calibration power value subsequently. Therefore, a plurality of data calibration tables of the vehicle-mounted liquid crystal display backlight source can be established according to the aging rate of the vehicle-mounted liquid crystal display backlight source, the calibration power value of the calibration parameter data of each data calibration table has a uniform numerical threshold value or numerical fluctuation range, and the numerical threshold value or numerical fluctuation range of the calibration power value of the calibration parameter data in different data calibration tables increases along with the increase of the aging rate of the backlight source.
In this embodiment, three data calibration tables of the vehicle-mounted liquid crystal display backlight source are established respectively corresponding to the use duration less than 5000 hours (slow aging degree), the use duration of 5000-10000 hours (fast aging degree) and the use duration more than 10000 hours (fast aging degree), the three data calibration tables respectively correspond to different value thresholds or value fluctuation ranges, and the value thresholds or the value fluctuation ranges are increased along with the increase of the aging rate of the backlight source.
It will be appreciated by those skilled in the art that even if only one data calibration table is established for the on-board display backlight, the threshold or range of values may be increased in response to an increase in the aging rate of the backlight.
And S20, acquiring the service life, the brightness information and the actual power value of the backlight source of the vehicle-mounted liquid crystal display screen.
And acquiring the service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, detecting the current measurement value and the voltage measurement value of the vehicle-mounted liquid crystal display backlight source, and calculating to obtain the actual power value of the vehicle-mounted liquid crystal display backlight source.
Specifically, the vehicle-mounted liquid crystal display backlight emits light at a certain brightness when in work. When the working condition of the vehicle-mounted liquid crystal display backlight source is monitored, the service life of the vehicle-mounted liquid crystal display backlight source and brightness information related to the current brightness are obtained, a current measurement value and a voltage measurement value of the vehicle-mounted liquid crystal display backlight source are detected, and the actual power value of the vehicle-mounted liquid crystal display backlight source is obtained based on the detected current measurement value and the detected voltage measurement value.
According to the monitoring request, detecting a current measurement value and a voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen under a brightness condition (based on brightness information) to obtain an actual power value; the current measurement value and the voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source can be detected under different brightness conditions (based on a plurality of brightness information) to obtain a plurality of actual power values. The current measurement value and the voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source under the condition of multiple brightness are obtained, and the working condition of the vehicle-mounted liquid crystal display screen backlight source is favorably and comprehensively monitored. The monitoring unit can adjust brightness information output to the vehicle-mounted liquid crystal display backlight source by adopting a PWM signal, namely, the brightness information of the vehicle-mounted liquid crystal display backlight source is adjusted by the PWM signal, the voltage or the current of the vehicle-mounted liquid crystal display backlight source is kept unchanged, the duty ratio of the PWM signal is adjusted, the vehicle-mounted liquid crystal display backlight source flickers light and dark, when the flicker frequency of the vehicle-mounted liquid crystal display backlight source exceeds a certain value, human vision can only realize the change of screen brightness, the brightness is high if the conduction time is long, and the brightness is low if the conduction time is short.
Preferably, the monitoring of vehicle-mounted liquid crystal display backlight source is carried out when the vehicle-mounted liquid crystal display backlight source reaches preset service life to according to the monitoring request, the vehicle-mounted liquid crystal display backlight source gives out light with preset luminance information, and corresponding calibration parameter data are arranged in a data calibration table of the vehicle-mounted liquid crystal display backlight source. For example, as shown in table 1, when the vehicle-mounted liquid crystal display backlight reaches the use time of 6200, 6400, 6600, 6800, 7000, 7200, 7400, and 7400 hours, the vehicle-mounted liquid crystal display backlight emits light at 50% of the preset brightness, and the vehicle-mounted liquid crystal display backlight is monitored.
S30: and determining a corresponding calibration power value in a data calibration table of the vehicle-mounted liquid crystal display screen backlight source according to the obtained service duration and brightness information of the vehicle-mounted liquid crystal display screen backlight source.
And determining a calibration power value in calibration parameter data with the same or similar use duration and brightness information in a data calibration table of the vehicle-mounted liquid crystal display screen backlight source according to the obtained use duration and brightness information of the vehicle-mounted liquid crystal display screen backlight source.
In this step, preferably, the backlight source of the vehicle-mounted liquid crystal display is controlled to emit light by preset brightness information, the working duration of the backlight source of the vehicle-mounted liquid crystal display is obtained in real time, the backlight source of the vehicle-mounted liquid crystal display is monitored, and the calibration power value in the calibration parameter data with the same or similar use duration and brightness information is determined in the data calibration table of the backlight source of the vehicle-mounted liquid crystal display.
More preferably, the monitoring of the vehicle-mounted liquid crystal display backlight source is performed when the preset service time of the vehicle-mounted liquid crystal display backlight source is reached, the vehicle-mounted liquid crystal display backlight source emits light with preset brightness information, and corresponding calibration parameter data are arranged in a data calibration table of the vehicle-mounted liquid crystal display backlight source. At this time, the same corresponding calibration power value can be directly searched in the calibration parameter data of the data calibration table of the vehicle-mounted liquid crystal display backlight source.
In addition, because the monitoring of the backlight source of the vehicle-mounted liquid crystal display screen can be started at variable time, the service duration and the brightness information of the current vehicle-mounted liquid crystal display screen can not completely correspond to (are the same as) the service duration and the brightness information in the calibration parameter data of the data calibration table during the monitoring. Preferably, under the condition that the obtained service duration and brightness information of the backlight source of the vehicle-mounted liquid crystal display cannot completely correspond to the service duration and the brightness information in the calibration parameter data of the data calibration table, the calibration power value is extracted from the calibration parameter data of the data calibration table which is closer to the actual service duration and the brightness information of the current vehicle-mounted liquid crystal display, wherein the service duration is preferably considered. For example, the calibration parameter data items 2 and 3 in Table 1 respectively list the calibration power values of the vehicle LCD backlight source used at 50% brightness for 6400 hours and 6600 hours, respectively. If the actual use time of the liquid crystal display screen on the vehicle to be tested is 6520 hours, and the actual use time is 6520 hours closer to the use time 6600 hours when the liquid crystal display screen is monitored under the condition of 50% brightness, extracting the calibration power value in the 3 rd item of calibration parameter data in the table 1.
S40: and comparing the actual power value and the calibrated power value of the vehicle-mounted liquid crystal display screen backlight source to determine whether the vehicle-mounted liquid crystal display screen backlight source is abnormal.
And comparing the actual power value of the vehicle-mounted liquid crystal display backlight source with the determined calibration power value, if the actual power value of the vehicle-mounted liquid crystal display backlight source is within the extracted calibration power value range (namely, the actual power value of the vehicle-mounted liquid crystal display backlight source does not exceed the threshold value range of the extracted calibration power value or the actual power value of the vehicle-mounted liquid crystal display backlight source is within the value fluctuation interval of the extracted calibration power value), the vehicle-mounted liquid crystal display backlight source works in a normal working condition, otherwise, the vehicle-mounted liquid crystal display backlight source is in an abnormal state, and a sound or character alarm is sent out.
In the method, the normal working condition of the vehicle-mounted liquid crystal display screen backlight source can be monitored by comparing the actual power value of the vehicle-mounted liquid crystal display screen backlight source with the calibration power value in the corresponding calibration parameter data in the data calibration table, and the liquid crystal display screen fault caused by aging of the vehicle-mounted liquid crystal display screen backlight source can be effectively avoided.
In addition, in the method, when the backlight source of the vehicle-mounted liquid crystal display is confirmed to work under the normal working condition by monitoring the actual power value (aging degree) of the backlight source of the vehicle-mounted liquid crystal display, the possibility that the backlight source of the vehicle-mounted liquid crystal display has hardware circuit faults can not be completely eliminated, for example, when an individual LED in an LED matrix of the LED backlight source is in an open circuit, the situation that the actual power value meets the requirement of the normal working condition and the current measurement value and the voltage measurement value fluctuate and exceed the normal working condition can occur. In order to timely find a circuit fault of the vehicle-mounted liquid crystal display screen backlight source, on the basis of comparing the power values in fig. 1, as shown in fig. 2, the method for monitoring the vehicle-mounted liquid crystal display screen backlight source according to the embodiment of the present invention further includes step S50:
s50: and comparing the current measurement value and/or the voltage measurement value of the vehicle-mounted liquid crystal display backlight source with the calibration current value and the calibration voltage value corresponding to the calibration power value determined in the data calibration table, and determining whether the vehicle-mounted liquid crystal display backlight source is abnormal or not.
And comparing the current measurement value and/or the voltage measurement value of the vehicle-mounted liquid crystal display backlight source with the calibration current value and the calibration voltage value in the calibration parameter data determined in the step S30 to monitor the working condition of the vehicle-mounted liquid crystal display backlight source.
If the current measurement value of the vehicle-mounted liquid crystal display screen backlight exceeds the calibration current value range (namely, the current measurement value of the vehicle-mounted liquid crystal display screen backlight exceeds the threshold value range of the value of the calibration current value, or the current measurement value of the vehicle-mounted liquid crystal display screen backlight is not in the value fluctuation interval of the calibration current value), the vehicle-mounted liquid crystal display screen backlight is in an abnormal state, and a sound or character alarm is given; or if the voltage measurement value of the vehicle-mounted liquid crystal display backlight exceeds the range of the calibration voltage value (namely, the voltage measurement value of the vehicle-mounted liquid crystal display backlight exceeds the threshold range of the value of the calibration voltage value or the voltage measurement value of the vehicle-mounted liquid crystal display backlight is not in the value fluctuation range of the calibration voltage value), the vehicle-mounted liquid crystal display backlight is in an abnormal state, and a sound or text alarm is sent out.
Preferably, the voltage measurement value of the vehicle-mounted liquid crystal display backlight source is firstly compared with the voltage calibration value in the corresponding calibration parameter data with the same or similar use duration and brightness information in the data calibration table, and when the voltage measurement value of the vehicle-mounted liquid crystal display backlight source is within the calibration voltage value range (namely, the voltage measurement value of the vehicle-mounted liquid crystal display backlight source does not exceed the threshold value range of the value of the calibration voltage value or the voltage measurement value of the vehicle-mounted liquid crystal display backlight source is within the value fluctuation range of the calibration voltage value), the current measurement value of the vehicle-mounted liquid crystal display backlight source is compared with the current calibration value in the corresponding calibration parameter data with the same or similar use duration and brightness information in the data calibration table. The reason for setting like this is that, when the hardware circuit of on-vehicle liquid crystal display backlight exists the trouble, voltage measurement value changes comparatively obviously, and the change of voltage inevitably leads to the current change, so need not to compare current measurement value again, can directly confirm that on-vehicle liquid crystal display backlight is in abnormal state.
In the method, the normal working condition of the vehicle-mounted liquid crystal display backlight source can be monitored by comparing the current measurement value and/or the voltage measurement value of the vehicle-mounted liquid crystal display backlight source with the calibration current value and the calibration voltage value in the data calibration table, and the liquid crystal display failure caused by the circuit failure of the vehicle-mounted liquid crystal display backlight source can be effectively avoided.
It should be noted that the method of the embodiment of the present invention can be applied to the start, the operation process and the operation end of the vehicle-mounted liquid crystal display, so as to monitor the working condition of the backlight source of the vehicle-mounted liquid crystal display, and if there is an abnormality, the method can prompt the driver through sound or text information. For example, the backlight source of the vehicle-mounted liquid crystal display screen can be monitored at the same brightness during the startup and shutdown, and after the operation of the vehicle-mounted liquid crystal display screen is finished, the working time of the backlight source of the vehicle-mounted liquid crystal display screen is updated.
According to another aspect of the present invention, an embodiment of the present invention provides a monitoring apparatus for a vehicle-mounted liquid crystal display backlight, as shown in fig. 3, including a voltage detection unit, a current detection unit, and a monitoring unit, where the voltage detection unit and the current detection unit are respectively connected to the monitoring unit.
Specifically, the voltage detection unit detects a voltage measurement value of the vehicle-mounted liquid crystal display backlight source, and the current detection unit detects a current measurement value of the vehicle-mounted liquid crystal display backlight source.
In a preferred embodiment of the present invention, as shown in fig. 4a, the voltage detection unit includes an operational amplifier, a capacitor C, a switch, a first resistor Ra and a second resistor Rb. The same-direction input end of the operational amplifier is grounded, the reverse input end of the operational amplifier can be connected to the first end of the first resistor Ra and the first end of the second resistor Rb respectively through the change-over switch, the second end of the first resistor Ra is connected with the voltage Vin of the vehicle-mounted liquid crystal display backlight source, the second end of the second resistor Vb is connected with the reference voltage Vref, and the capacitor C is connected between the reverse input end of the operational amplifier and the output end Vout.
When the voltage detection unit detects the voltage of the vehicle-mounted liquid crystal display screen backlight source, as shown in fig. 4b, the reversing input end of the operational amplifier is connected to the first resistor Ra by the change-over switch, the voltage Vin of the vehicle-mounted liquid crystal display screen backlight source charges the integrating circuit, and the charging time is timed to be Tu, as shown in fig. 4b, during the rising period; the switch connects the inverting input of the operational amplifier to the second resistor Rb, and the integrating circuit discharges at a fixed rate according to the reference voltage Vref, timing the discharge time to Td, as shown by the falling period in fig. 4b, so that the voltage Vin of the on-board liquid crystal display backlight is obtained by the following formula (where the negative sign "-" indicates the current direction):
Vin＝|-Vref((Ra/Rb)·(td/tu))|。
in a preferred embodiment of the present invention, as shown in fig. 5, the current detection unit includes a measuring resistor R and an ADC converter. The current of the backlight source of the vehicle-mounted liquid crystal display screen is converted into a voltage value by a measuring resistor R, and the voltage V at two ends of the measuring resistor R is measured by an ADC (analog to digital converter)RBy passing
Figure BDA0002108964800000111
A current measurement is obtained.
The monitoring unit acquires the service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, and obtains the actual power value of the vehicle-mounted liquid crystal display backlight source according to the voltage measurement value detected by the voltage detection unit and the current measurement value detected by the current detection unit; determining a corresponding calibration power value in a data calibration table of the vehicle-mounted liquid crystal display backlight source according to the obtained service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, wherein the data calibration table of the vehicle-mounted liquid crystal display backlight source is used for calibrating power calibration values which the vehicle-mounted liquid crystal display backlight sources with different service durations should have when working with corresponding brightness information; and comparing the actual power value and the calibrated power value of the vehicle-mounted liquid crystal display screen backlight source to determine whether the vehicle-mounted liquid crystal display screen backlight source is abnormal.
And for the tested specific type of the vehicle-mounted liquid crystal display screen, establishing and storing a data calibration table between the brightness information and the consumed power of the backlight source of the vehicle-mounted liquid crystal display screen based on the aging degree of the vehicle-mounted liquid crystal display screen. The data calibration table of the vehicle-mounted liquid crystal display backlight source is a set of normal working condition parameter data of the vehicle-mounted liquid crystal display backlight source. The monitoring device for the vehicle-mounted liquid crystal display screen backlight source provided by the embodiment of the invention further comprises a storage unit (not shown in the figure), and the data calibration table of the vehicle-mounted liquid crystal display screen backlight source is stored in the storage unit.
The data calibration table of the vehicle-mounted liquid crystal display backlight source comprises a plurality of calibration parameter data, and each calibration parameter data can comprise a rated voltage value, a rated current value, a use duration, brightness information, a calibration current value, a calibration voltage value and a calibration power value.
The rated voltage value and the rated current value are the rated power supply voltage value and the rated power supply current value of the tested specific type of vehicle-mounted liquid crystal display backlight source, such as 12V/100mA and 24V/200mA, if the tested specific type of vehicle-mounted liquid crystal display backlight source can work under different conditions of the rated power supply voltage value and the rated power supply current value, corresponding setting in the calibration parameter data is necessary, and if the tested specific type of vehicle-mounted liquid crystal display backlight source only works under a single condition of the rated power supply voltage value and the rated power supply current value, setting in the calibration parameter data is unnecessary.
The operating time of the actual emergence of the long for vehicle carried liquid crystal display backlight during operation can be timed by timing unit to the length of time is used in real-time storage in storage component, perhaps the length of time is used in the storage component to the update at vehicle carried liquid crystal display shutdown moment. Of course, the monitoring device of the vehicle-mounted liquid crystal display backlight source can also comprise a timing unit, the working time of the vehicle-mounted liquid crystal display backlight source is timed, and the working time is stored in the storage unit of the monitoring device of the vehicle-mounted liquid crystal display backlight source.
The brightness information may be the brightness level of the backlight source of the specific type of vehicle-mounted liquid crystal display to be tested, for example, the brightness level may be set as a percentage of 0-100, or may be a specific brightness value (lumen).
The calibration current value and the calibration voltage value are based on the voltage value and the current value (the voltage value is related to the current value) when the backlight source of the vehicle-mounted liquid crystal display screen of the specific type to be tested emits light with corresponding brightness information under the normal working condition of applying the rated current value and the rated voltage value. And recording a voltage value and a current value of the tested specific type of vehicle-mounted liquid crystal display backlight source in each calibration parameter data when the backlight source emits light according to corresponding brightness information, wherein the calibration current value and the calibration voltage value can be a specific numerical value fluctuation interval or a specific numerical value.
The calibration power value is determined according to a calibration current value and a calibration voltage value and is adaptive to the values of the calibration current value and the calibration voltage value, and the calibration power value can be a numerical value or a numerical value fluctuation interval.
Therefore, each calibration parameter data records a calibration current value and a calibration voltage value which the vehicle-mounted liquid crystal display screen should have when the vehicle-mounted liquid crystal display screen emits light with corresponding brightness information under the condition that rated current and voltage are applied to the backlight source of the specific type with different service durations, and a calibration power value obtained based on the calibration current value and the calibration voltage value.
When the vehicle-mounted liquid crystal display screen backlight source works, the vehicle-mounted liquid crystal display screen backlight source emits light with certain brightness. When the monitoring unit monitors the working condition of the vehicle-mounted liquid crystal display backlight source, the monitoring unit acquires the service life of the vehicle-mounted liquid crystal display backlight source and brightness information related to the current brightness, detects a current measurement value and a voltage measurement value of the vehicle-mounted liquid crystal display backlight source, and obtains the actual power value of the vehicle-mounted liquid crystal display backlight source based on the detected current measurement value and voltage measurement value.
According to the monitoring request, the monitoring unit detects a current measurement value and a voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen under a brightness condition (based on brightness information) to obtain an actual power value; the monitoring unit can also detect the current measurement value and the voltage measurement value of the vehicle-mounted liquid crystal display backlight source under different brightness conditions (based on a plurality of brightness information) to obtain a plurality of actual power values. The current measurement value and the voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source under the condition of multiple brightness are obtained, and the working condition of the vehicle-mounted liquid crystal display screen backlight source is favorably and comprehensively monitored. The monitoring unit can adjust brightness information output to the vehicle-mounted liquid crystal display backlight source by adopting a PWM signal, namely, the brightness information of the vehicle-mounted liquid crystal display backlight source is adjusted by the PWM signal, the voltage or the current of the vehicle-mounted liquid crystal display backlight source is kept unchanged, the duty ratio of the PWM signal is adjusted, the vehicle-mounted liquid crystal display backlight source flashes in a bright and dark mode, when the flashing frequency of the vehicle-mounted liquid crystal display backlight source exceeds a certain value, human vision can only realize the change of screen brightness, the brightness is high if the conduction time is long, and the brightness is low if the conduction time is short.
Preferably, when the vehicle-mounted liquid crystal display screen backlight source reaches the preset use time, the vehicle-mounted liquid crystal display screen backlight source is monitored, the monitoring unit sends preset brightness information to the vehicle-mounted liquid crystal display screen backlight source, the vehicle-mounted liquid crystal display screen backlight source emits light according to the preset brightness information, and corresponding calibration parameter data are arranged in a data calibration table of the vehicle-mounted liquid crystal display screen backlight source. For example, as shown in table 1, when the vehicle-mounted liquid crystal display backlight reaches the use time of 6200, 6400, 6600, 6800, 7000, 7200, 7400, and 7400 hours, the vehicle-mounted liquid crystal display backlight emits light at 50% of the preset brightness, and the vehicle-mounted liquid crystal display backlight is monitored.
The monitoring unit determines a calibration power value in calibration parameter data with the same or similar use duration and brightness information in a data calibration table of the vehicle-mounted liquid crystal display screen backlight source according to the obtained use duration and brightness information of the vehicle-mounted liquid crystal display screen backlight source; and comparing the actual power value of the vehicle-mounted liquid crystal display backlight source with the determined calibration power value, if the actual power value of the vehicle-mounted liquid crystal display backlight source is within the extracted calibration power value range (namely, the actual power value of the vehicle-mounted liquid crystal display backlight source does not exceed the threshold value range of the extracted calibration power value or the actual power value of the vehicle-mounted liquid crystal display backlight source is within the value fluctuation interval of the extracted calibration power value), the vehicle-mounted liquid crystal display backlight source works in a normal working condition, otherwise, the vehicle-mounted liquid crystal display backlight source is in an abnormal state, and a sound or character alarm is sent out.
Therefore, the monitoring device for the vehicle-mounted liquid crystal display screen backlight source provided by the embodiment of the invention can monitor the normal working condition of the vehicle-mounted liquid crystal display screen backlight source by comparing the actual power value of the vehicle-mounted liquid crystal display screen backlight source with the calibration power value in the corresponding calibration parameter data in the data calibration table, and can effectively avoid the liquid crystal display screen fault caused by the aging of the vehicle-mounted liquid crystal display screen backlight source.
In addition, in order to timely find out a circuit fault of the vehicle-mounted liquid crystal display screen backlight source, in the monitoring device of the vehicle-mounted liquid crystal display screen backlight source of the embodiment of the invention, the monitoring unit compares a current measurement value and/or a voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source with a calibration current value and a calibration voltage value corresponding to the calibration power value determined in the data calibration table, and determines whether the vehicle-mounted liquid crystal display screen backlight source is abnormal or not.
And the monitoring unit compares the current measurement value and/or the voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen with the calibration current value and the calibration voltage value corresponding to the determined calibration power value so as to monitor the working condition of the backlight source of the vehicle-mounted liquid crystal display screen.
If the current measurement value of the vehicle-mounted liquid crystal display screen backlight exceeds the calibration current value range (namely, the current measurement value of the vehicle-mounted liquid crystal display screen backlight exceeds the threshold value range of the value of the calibration current value, or the current measurement value of the vehicle-mounted liquid crystal display screen backlight is not in the value fluctuation interval of the calibration current value), the vehicle-mounted liquid crystal display screen backlight is in an abnormal state, and a sound or character alarm is given; or if the voltage measurement value of the vehicle-mounted liquid crystal display backlight exceeds the calibration voltage value range (namely, the voltage measurement value of the vehicle-mounted liquid crystal display backlight exceeds the threshold value range of the value of the calibration voltage value, or the voltage measurement value of the vehicle-mounted liquid crystal display backlight is not in the value fluctuation range of the calibration voltage value), the vehicle-mounted liquid crystal display backlight is in an abnormal state, and a sound or character alarm is given out.
Preferably, the voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source is compared with the voltage calibration value in the data calibration table, and when the voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source is within the calibration voltage value range (that is, the voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source does not exceed the threshold value range of the value of the calibration voltage value, or the voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source is within the value fluctuation interval of the calibration voltage value), the current measurement value of the vehicle-mounted liquid crystal display screen backlight source is compared with the current calibration value in the data calibration table.
The monitoring device for the vehicle-mounted liquid crystal display screen backlight source provided by the embodiment of the invention can monitor the normal working condition of the vehicle-mounted liquid crystal display screen backlight source by comparing the current measurement value and/or the voltage measurement value of the vehicle-mounted liquid crystal display screen backlight source with the calibration current value and the calibration voltage value in the data calibration table, and can effectively avoid the liquid crystal display screen fault caused by the circuit fault of the vehicle-mounted liquid crystal display screen backlight source.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above method.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when executing the program.
Those of skill in the art will understand that the logic and/or steps illustrated in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. A monitoring method for a backlight source of a vehicle-mounted liquid crystal display screen is characterized by comprising the following steps:
acquiring the service duration, the brightness information and the actual power value of the backlight source of the vehicle-mounted liquid crystal display screen;
determining a corresponding calibration power value in a data calibration table of the vehicle-mounted liquid crystal display backlight source according to the obtained service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, wherein the data calibration table of the vehicle-mounted liquid crystal display backlight source is used for calibrating power calibration values which the vehicle-mounted liquid crystal display backlight sources with different service durations should have when working with corresponding brightness information;
and comparing the actual power value and the calibrated power value of the vehicle-mounted liquid crystal display screen backlight source to determine whether the vehicle-mounted liquid crystal display screen backlight source is abnormal.
2. The method of monitoring a vehicle-mounted liquid crystal display backlight according to claim 1, wherein a plurality of data calibration tables for the vehicle-mounted liquid crystal display backlight are set according to an aging rate of the vehicle-mounted liquid crystal display backlight,
the calibration power values of the calibration parameter data in each data calibration table have a uniform value threshold or value fluctuation range,
along with the acceleration of the aging rate of the backlight source of the vehicle-mounted liquid crystal display screen, the numerical threshold value or the numerical fluctuation range of the calibration power value of the calibration parameter data in the corresponding data calibration table is increased.
3. The method for monitoring a backlight source of a vehicle-mounted liquid crystal display screen according to claim 1, wherein a data calibration table of the backlight source of the vehicle-mounted liquid crystal display screen is provided according to an aging rate of the backlight source of the vehicle-mounted liquid crystal display screen,
and increasing the numerical threshold value or the numerical fluctuation range of the calibration power value in different calibration parameter data in the data calibration table along with the acceleration of the aging rate of the backlight source of the vehicle-mounted liquid crystal display screen.
4. The method for monitoring a backlight of an on-board display as recited in claim 1, further comprising, before determining the corresponding calibration power value, the steps of:
establishing and storing data calibration table of vehicle-mounted liquid crystal display screen backlight source, and/or
And monitoring the service life of the vehicle-mounted liquid crystal display backlight source.
5. The method for monitoring the vehicle-mounted liquid crystal display backlight source according to claim 1, wherein a calibration power value in calibration parameter data having the same or similar use duration and brightness information is determined in a data calibration table of the vehicle-mounted liquid crystal display backlight source according to the obtained use duration and brightness information of the vehicle-mounted liquid crystal display backlight source.
6. The method for monitoring the backlight source of the vehicle-mounted liquid crystal display screen according to claim 5, wherein the preset brightness information is used for controlling the backlight source of the vehicle-mounted liquid crystal display screen to emit light, the working time of the backlight source of the vehicle-mounted liquid crystal display screen is obtained in real time, and a calibration power value in calibration parameter data with the same or similar service time and brightness information is determined in a data calibration table of the backlight source of the vehicle-mounted liquid crystal display screen; alternatively, the first and second electrodes may be,
carry out the monitoring of vehicle-mounted liquid crystal display backlight when reaching the length of use of predetermineeing of vehicle-mounted liquid crystal display backlight for vehicle-mounted liquid crystal display backlight is luminous with predetermined luminance information.
7. The method for monitoring the backlight source of the vehicle-mounted liquid crystal display screen according to any one of claims 1 to 6, wherein the actual power value and the calibrated power value of the backlight source of the vehicle-mounted liquid crystal display screen are compared, and if the actual power value of the backlight source of the vehicle-mounted liquid crystal display screen is within the calibrated power value range, the current measurement value and/or the voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen are/is compared with the calibrated current value and the calibrated voltage value corresponding to the calibrated power value determined in the data calibration table, so as to determine whether the backlight source of the vehicle-mounted liquid crystal display screen is abnormal or not.
8. The method for monitoring the backlight source of the vehicle-mounted liquid crystal display screen according to claim 7, wherein the voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen is firstly compared with the calibration voltage value corresponding to the calibration power value determined in the data calibration table, and when the voltage measurement value of the backlight source of the vehicle-mounted liquid crystal display screen is within the calibration voltage value range, the current measurement value of the backlight source of the vehicle-mounted liquid crystal display screen is compared with the calibration current value corresponding to the calibration power value determined in the data calibration table.
9. The monitoring device for the backlight source of the vehicle-mounted liquid crystal display screen is characterized by comprising a voltage detection unit, a current detection unit and a monitoring unit, wherein the voltage detection unit and the current detection unit are respectively connected with the monitoring unit,
the voltage detection unit detects a voltage measurement value of the vehicle-mounted liquid crystal display backlight source, and the current detection unit detects a current measurement value of the vehicle-mounted liquid crystal display backlight source;
the monitoring unit acquires the service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, and obtains the actual power value of the vehicle-mounted liquid crystal display backlight source according to the voltage measurement value and the current measurement value; determining a corresponding calibration power value in a data calibration table of the vehicle-mounted liquid crystal display backlight source according to the obtained service duration and the brightness information of the vehicle-mounted liquid crystal display backlight source, wherein the data calibration table of the vehicle-mounted liquid crystal display backlight source is used for calibrating power calibration values which the vehicle-mounted liquid crystal display backlight sources with different service durations should have when working with corresponding brightness information; and comparing the actual power value and the calibrated power value of the vehicle-mounted liquid crystal display screen backlight source to determine whether the vehicle-mounted liquid crystal display screen backlight source is abnormal.
10. The apparatus for monitoring a backlight source for a vehicle-mounted liquid crystal display panel according to claim 9, wherein the apparatus for monitoring a backlight source for a vehicle-mounted liquid crystal display panel further comprises a storage unit and a timing unit,
the storage unit stores a data calibration table of the vehicle-mounted liquid crystal display backlight source,
the timing unit is used for timing the service life of the backlight source of the vehicle-mounted liquid crystal display screen and storing the service life data in the storage unit.
11. The apparatus for monitoring a backlight source of a vehicle-mounted liquid crystal display panel according to claim 9, wherein a plurality of data calibration tables of the backlight source of the vehicle-mounted liquid crystal display panel are set according to an aging rate of the backlight source of the vehicle-mounted liquid crystal display panel,
the calibration power values of the calibration parameter data in each data calibration table have a uniform value threshold or value fluctuation range,
along with the acceleration of the aging rate of the backlight source of the vehicle-mounted liquid crystal display screen, the numerical threshold value or the numerical fluctuation range of the calibration power value of the calibration parameter data in the corresponding data calibration table is increased.
12. The device for monitoring the backlight source of the vehicle-mounted liquid crystal display screen according to claim 9, wherein the monitoring unit controls the backlight source of the vehicle-mounted liquid crystal display screen to emit light according to preset brightness information, obtains the working duration of the backlight source of the vehicle-mounted liquid crystal display screen in real time, and determines the calibration power value in the calibration parameter data with the same or similar use duration and brightness information in a data calibration table of the backlight source of the vehicle-mounted liquid crystal display screen; alternatively, the first and second electrodes may be,
when the preset use time of the vehicle-mounted liquid crystal display backlight source is reached, the monitoring unit monitors the vehicle-mounted liquid crystal display backlight source, so that the vehicle-mounted liquid crystal display backlight source emits light according to preset brightness information.
13. The apparatus for monitoring the backlight source of the lcd panel of claim 9, wherein the monitoring unit compares the actual power value and the calibrated power value of the backlight source of the lcd panel, and if the actual power value of the backlight source of the lcd panel is within the calibrated power value range, the monitoring unit compares the measured current value and/or the measured voltage value of the backlight source of the lcd panel with the calibrated current value and the calibrated voltage value corresponding to the calibrated power value determined in the data calibration table, and determines whether the backlight source of the lcd panel of the vehicle is abnormal.
14. The apparatus for monitoring the backlight source of the on-vehicle display screen according to claim 13, wherein the monitoring unit compares the voltage measurement value of the backlight source of the on-vehicle display screen with the calibration voltage value corresponding to the calibration power value determined in the data calibration table, and when the voltage measurement value of the backlight source of the on-vehicle display screen is within the calibration voltage value range, the monitoring unit compares the current measurement value of the backlight source of the on-vehicle display screen with the calibration current value corresponding to the calibration power value determined in the data calibration table.
15. The apparatus for monitoring a backlight source of a vehicle liquid crystal display panel according to claim 9, wherein the voltage detecting unit comprises an operational amplifier, a capacitor, a switch, a first resistor Ra and a second resistor Rb, the same input terminal of the operational amplifier is grounded, the opposite input terminal is connected to a first terminal of the first resistor Ra and a first terminal of the second resistor Rb respectively through the switch, a second terminal of the first resistor Ra is connected to a voltage Vin of the backlight source of the vehicle liquid crystal display panel, a second terminal of the second resistor Vb is connected to a reference voltage Vref, the capacitor is connected between the opposite input terminal of the operational amplifier and the output terminal Vout,
when the voltage detection unit detects the voltage of the vehicle-mounted liquid crystal display screen backlight source, the reversing input end of the operational amplifier is connected to the first resistor Ra by the change-over switch, the voltage Vin of the vehicle-mounted liquid crystal display screen backlight source charges the integrating circuit, and the charging time is Tu; subsequently, the inverting input terminal of the operational amplifier is connected to the second resistor Rb by the switch, the integrating circuit discharges with the reference voltage Vref for a discharge time Td, and the voltage Vin of the vehicle-mounted liquid crystal display backlight source is:
Vin＝|-Vref((Ra/Rb)·(td/tu))|。
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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111081193A (en) * 2020-01-07 2020-04-28 业成科技（成都）有限公司 Display and brightness adjusting method thereof
CN111397853B (en) * 2020-03-13 2022-10-14 西安闻泰电子科技有限公司 Backlight self-checking system and method
CN115359748B (en) * 2022-10-20 2023-02-10 武汉海微科技有限公司 Yellow screen detection circuit and yellow screen detection method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101203797A (en) * 2005-06-24 2008-06-18 株式会社小松制作所 Liquid crystal display
CN101449316A (en) * 2006-05-15 2009-06-03 皇家飞利浦电子股份有限公司 Method and device for driving an image display apparatus
CN103229228A (en) * 2010-11-30 2013-07-31 Nec显示器解决方案株式会社 Display device and color-orrection method for display device
CN104071009A (en) * 2013-03-27 2014-10-01 比亚迪股份有限公司 Processing method for display failure of vehicle-mounted meter and vehicle-mounted meter system
CN105336303A (en) * 2015-12-10 2016-02-17 四川长虹电子系统有限公司 Method for calculating power consumption of liquid crystal display
CN109342797A (en) * 2018-08-24 2019-02-15 维沃移动通信有限公司 A kind of backlight power sense circuit, terminal and backlight source detection method
CN109814827A (en) * 2019-01-28 2019-05-28 Oppo广东移动通信有限公司 Display control method and device of equipment, electronic equipment and storage medium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201057625Y (en) * 2006-11-17 2008-05-07 周建林 Electric property checking and protecting equipment
CN102243852B (en) * 2011-07-04 2014-02-26 深圳市华星光电技术有限公司 Liquid crystal display, and method and device for driving liquid crystal display

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101203797A (en) * 2005-06-24 2008-06-18 株式会社小松制作所 Liquid crystal display
CN101449316A (en) * 2006-05-15 2009-06-03 皇家飞利浦电子股份有限公司 Method and device for driving an image display apparatus
CN103229228A (en) * 2010-11-30 2013-07-31 Nec显示器解决方案株式会社 Display device and color-orrection method for display device
CN104071009A (en) * 2013-03-27 2014-10-01 比亚迪股份有限公司 Processing method for display failure of vehicle-mounted meter and vehicle-mounted meter system
CN105336303A (en) * 2015-12-10 2016-02-17 四川长虹电子系统有限公司 Method for calculating power consumption of liquid crystal display
CN109342797A (en) * 2018-08-24 2019-02-15 维沃移动通信有限公司 A kind of backlight power sense circuit, terminal and backlight source detection method
CN109814827A (en) * 2019-01-28 2019-05-28 Oppo广东移动通信有限公司 Display control method and device of equipment, electronic equipment and storage medium

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