CN116312304B - HUD device display brightness adjusting method, HUD device display brightness adjusting device and storage medium - Google Patents

HUD device display brightness adjusting method, HUD device display brightness adjusting device and storage medium Download PDF

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CN116312304B
CN116312304B CN202310186879.2A CN202310186879A CN116312304B CN 116312304 B CN116312304 B CN 116312304B CN 202310186879 A CN202310186879 A CN 202310186879A CN 116312304 B CN116312304 B CN 116312304B
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parameter
pwm output
brightness
display brightness
feedback
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CN116312304A (en
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张涛
王刚
张永波
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Jiangsu Zejing Automobile Electronic Co ltd
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Jiangsu Zejing Automobile Electronic 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
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The disclosure relates to the technical field of vehicle electronics, in particular to a HUD device display brightness adjusting method, a HUD device display brightness adjusting device and a storage medium. The method comprises the following steps: collecting a current environment brightness parameter, determining a target PWM output parameter corresponding to a micro control unit of HUD equipment according to the current environment brightness parameter, and determining a maximum PWM output parameter corresponding to the current environment brightness parameter; determining a corresponding maximum A/D feedback parameter according to the maximum PWM output parameter; the PWM output parameter is used for controlling the display brightness of the HUD equipment, and the A/D feedback parameter is used for representing the output of the backlight control circuit; and collecting the current A/D feedback parameters, and comparing the current A/D feedback parameters with the maximum A/D feedback parameters to determine whether to adjust the target PWM output parameters according to the parameter comparison result. The scheme can realize accurate control of HUD equipment display brightness adjustment.

Description

HUD device display brightness adjusting method, HUD device display brightness adjusting device and storage medium
Technical Field
The disclosure relates to the technical field of vehicle electronics, in particular to a HUD device display brightness adjusting method, a HUD device display brightness adjusting device and a storage medium.
Background
With the rapid improvement of the electronization and intellectualization degree of automobiles, HUDs (Head Up displays) are also beginning to be assembled and used on more automobile types. The HUD can project important driving information such as speed of a vehicle, navigation, etc. onto a windshield in front of a driver. HUDs have evolved, and product types are also classified as WHUD and ARHUD. However, this also causes certain driving safety problems. That is, when the HUD device causes a glare problem due to excessive brightness of the output HUD image due to a problem of internal software or hardware. Especially, when driving at night, the driver is likely to be unable to see the road conditions clearly, which causes driving risks.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The disclosure provides a HUD device display brightness adjusting method, a HUD device display brightness adjusting device and a storage medium, which can realize accurate control of HUD device display brightness adjustment.
Other features and advantages of the present disclosure will be apparent from the following detailed description, or may be learned in part by the practice of the disclosure.
According to a first aspect of the present disclosure, there is provided a HUD device display brightness adjustment method, the method comprising:
collecting a current environment brightness parameter, determining a target PWM output parameter corresponding to a micro control unit of HUD equipment according to the current environment brightness parameter, and determining a maximum PWM output parameter corresponding to the current environment brightness parameter;
determining a corresponding maximum A/D feedback parameter according to the maximum PWM output parameter; the PWM output parameter is used for controlling the display brightness of the HUD equipment, and the A/D feedback parameter is used for representing the output of the backlight control circuit;
and collecting the current A/D feedback parameters, and comparing the current A/D feedback parameters with the maximum A/D feedback parameters to determine whether to adjust the target PWM output parameters according to the parameter comparison result.
In some exemplary embodiments, the determining, according to the current ambient brightness parameter, a target PWM output parameter corresponding to a micro control unit of the HUD device includes:
based on a preset corresponding relation between the ambient brightness and the display brightness of the HUD equipment, determining a display brightness range corresponding to the HUD equipment according to the current ambient brightness parameter;
configuring the target display brightness according to the intermediate value of the display brightness range;
And determining a target PWM output parameter corresponding to the target display brightness based on a preset corresponding relation between the HUD device display brightness and the PWM output value.
In some exemplary embodiments, the determining the maximum PWM output parameter corresponding to the current ambient brightness parameter includes:
determining the maximum display brightness according to the display brightness range corresponding to the current environment brightness parameter;
and determining the maximum PWM output parameter corresponding to the maximum display brightness based on a preset corresponding relation between the display brightness of the HUD equipment and the PWM output value.
In some exemplary embodiments, the determining the corresponding maximum a/D feedback parameter according to the maximum PWM output parameter includes:
and determining the maximum A/D feedback parameter corresponding to the maximum PWM output parameter based on a preset corresponding relation between the PWM output parameter and the A/D feedback parameter.
In some exemplary embodiments, the determining whether to adjust the target PWM output parameter according to the parameter comparison result includes any of the following determination results:
if the current A/D feedback parameter is larger than the maximum A/D feedback parameter, calculating an adjustment ratio of the A/D feedback parameter according to the current A/D feedback parameter and the maximum A/D feedback parameter, and calculating an adjustment range from the current A/D feedback parameter to the target PWM output parameter based on the adjustment ratio so as to control the target PWM output parameter according to the adjustment range;
If the current A/D feedback parameter is smaller than the minimum A/D feedback parameter, calculating an adjustment ratio of the A/D feedback parameter according to the current A/D feedback parameter and the minimum A/D feedback parameter, and calculating an adjustment range from the current A/D feedback parameter to the target PWM output parameter based on the adjustment ratio so as to control the target PWM output parameter according to the adjustment range.
In some exemplary embodiments, the method further comprises:
calibrating the brightness change time length of the display brightness of the HUD equipment;
and determining the brightness change rate based on the brightness change duration, and adjusting the target PWM output parameter according to the brightness change rate.
In some exemplary embodiments, the method further comprises: and pre-establishing corresponding relation data between the ambient brightness and the HUD equipment display brightness, PWM output parameters and A/D feedback parameters.
In some exemplary embodiments, establishing correspondence data between ambient brightness and HUD device display brightness, PWM output parameters, a/D feedback parameters, includes:
configuring a display brightness range corresponding to the HUD equipment according to different ambient brightness;
calibrating a PWM output parameter range corresponding to the micro control unit based on the display brightness range;
Calibrating an A/D feedback parameter corresponding to the backlight control circuit according to the PWM output parameter range;
and determining corresponding relation data between the ambient brightness and the HUD equipment display brightness, PWM output parameters and A/D feedback parameters according to the data calibration result.
According to a second aspect of the present disclosure, there is provided a HUD device display brightness adjusting apparatus comprising:
the environment brightness acquisition module is used for acquiring current environment brightness parameters;
the micro-control unit is used for determining a target PWM output parameter corresponding to the micro-control unit according to the current ambient brightness parameter and determining a maximum PWM output parameter corresponding to the current ambient brightness parameter; determining a corresponding maximum A/D feedback parameter according to the maximum PWM output parameter; the PWM output parameter is used for controlling the display brightness of the HUD equipment, and the A/D feedback parameter is used for representing the output of the backlight control circuit;
the current acquisition circuit is used for acquiring the current A/D feedback parameter corresponding to the backlight control circuit and feeding back the current A/D feedback parameter to the micro control unit, so that the micro control unit can compare the current A/D feedback parameter with the maximum A/D feedback parameter to judge whether to adjust the target PWM output parameter.
According to a third aspect of the present disclosure, there is provided a storage medium having stored thereon a computer program which, when executed by a processor, implements the HUD device display brightness adjustment method described above.
According to a fourth aspect of the present disclosure, there is provided an electronic device comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to implement the above-described HUD device display brightness adjustment method via execution of the executable instructions.
According to the HUD equipment display brightness adjusting method provided by the embodiment of the disclosure, the PWM output parameters of the corresponding micro control units under the current environment brightness are determined by collecting the current environment brightness parameters and utilizing the pre-calibrated corresponding relation, and the display brightness of the HUD equipment is directly controlled by utilizing the PWM output parameters, so that more accurate brightness control can be realized. Meanwhile, the display brightness of the HUD equipment is monitored and compared in real time by collecting the A/D feedback parameters, so that the limitation of the display brightness is realized, and the current value corresponding to the display brightness of the output image of the HUD equipment is monitored at most fundamentally; and then can effectually avoid HUD equipment can't accurate control HUD equipment display brightness's problem when the software is unusual, hardware is inefficacy.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 schematically illustrates a schematic diagram of a HUD apparatus display brightness adjustment method in an exemplary embodiment of the present disclosure;
FIG. 2 schematically illustrates a schematic diagram of a HUD device system architecture in accordance with an exemplary embodiment of the present disclosure;
FIG. 3 schematically illustrates a schematic diagram of a method of pre-building correspondence data according to an exemplary embodiment of the present disclosure;
FIG. 4 schematically illustrates a schematic diagram of an ambient brightness versus HUD display device data in an exemplary embodiment of the disclosure;
FIG. 5 schematically illustrates a schematic diagram of a data relationship between PWM output parameters and A/D feedback parameters in an exemplary embodiment of the present disclosure;
FIG. 6 schematically illustrates a method of determining a rate of change of brightness in an exemplary embodiment of the disclosure;
Fig. 7 schematically illustrates a flowchart of a HUD device display brightness adjustment method in an exemplary embodiment of the present disclosure;
fig. 8 schematically illustrates a composition diagram of a HUD apparatus display brightness adjusting device in an exemplary embodiment of the present disclosure;
fig. 9 schematically illustrates a composition diagram of an electronic device in an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software or in one or more hardware modules or integrated circuits or in different networks and/or processor devices and/or microcontroller devices.
In the related art, the display brightness of the HUD device for displaying the virtual image has a very important influence on the driving safety, and if the HUD virtual image brightness is too high due to software or hardware failure during driving, the driving safety is seriously affected. The existing HUD display control scheme has certain defects; for example, in the first practical situation, when a vehicle with a HUD is driven at night, the logic or calibration data of the internal software of the HUD is unreasonable, so that the brightness of the output HUD virtual image is too high, which causes that a driver cannot see the front obstacle clearly, and driving risk is caused. In the second practical situation, when a vehicle with a HUD is driven at night, the HUD virtual image is too high in brightness due to calculation errors of internal software of the HUD, so that a driver cannot see a front obstacle clearly, and driving risks are caused. In the third practical case, when a vehicle with a HUD is driven at night, due to the fact that hardware on an LED lamp panel used for controlling backlight inside the HUD is abnormal, the brightness of an output HUD virtual image is too high, a driver cannot see a front obstacle clearly, and driving risks are caused. If this occurs, the brightness of the virtual image output by the HUD is not controllable. When the software is miscalculated, the failure processing of the failure is not performed by the hardware detecting the failure. Thus, if the current calculation result needs to output higher HUD virtual image brightness, and the external environment light is darker at this time, HUD display glare is caused, which causes driving risk. Secondly, if a hardware abnormality occurs on the backlight luminance panel of the HUD device, but not an open circuit or a short circuit abnormality, the control logic of the existing scheme only causes the increase of the backlight output power, resulting in the rapid increase of the luminance, and the existing scheme cannot be identified and processed. The brightness of the virtual image is directly corresponding to the output power of the backlight plate, and the brightness of the virtual image is directly corresponding to the output current under the condition of unchanged voltage. The most significant reason for the HUD device display luminance abnormality in the above case is that the detection mechanism is not recognized from the most radical aspect.
Aiming at the defects and shortcomings of the prior art, the embodiment provides a HUD device display brightness adjusting method, which is used for fundamentally monitoring a current value corresponding to the virtual image brightness output by a HUD by collecting the corresponding A/D feedback parameters output by a backlight control circuit, so that the virtual image brightness output by the HUD is accurately limited. Referring to fig. 1, the above-mentioned HUD device display brightness adjusting method may include:
step S11, collecting a current ambient brightness parameter, determining a target PWM output parameter corresponding to a micro control unit of HUD equipment according to the current ambient brightness parameter, and determining a maximum PWM output parameter corresponding to the current ambient brightness parameter;
step S12, determining a corresponding maximum A/D feedback parameter according to the maximum PWM output parameter; the PWM output parameter is used for controlling the display brightness of the HUD equipment, and the A/D feedback parameter is used for representing the output of the backlight control circuit;
and S13, collecting current A/D feedback parameters, and comparing the current A/D feedback parameters with the maximum A/D feedback parameters to determine whether to adjust the target PWM output parameters according to the parameter comparison result.
According to the HUD equipment display brightness adjusting method provided by the embodiment of the invention, the PWM output parameters of the corresponding micro control units under the current environment brightness are determined by collecting the current environment brightness parameters and utilizing the pre-calibrated corresponding relation, and the display brightness of the HUD equipment is directly controlled by utilizing the PWM output parameters, so that more accurate brightness control can be realized. Meanwhile, the display brightness of the HUD equipment is monitored and compared in real time by collecting the A/D feedback parameters, so that the limitation of the display brightness is realized, and the current value corresponding to the display brightness of the output image of the HUD equipment is monitored at most fundamentally; and then can effectually avoid HUD equipment can't accurate control HUD equipment display brightness's problem when the software is unusual, hardware is inefficacy.
Next, each step of the HUD device display luminance adjusting method in the present exemplary embodiment will be described in more detail with reference to the drawings and examples.
In this example embodiment, the HUD device display brightness adjustment method may be applied to a system architecture as shown in fig. 2. The system architecture may include a micro control unit MCU201, a current acquisition circuit 202, a backlight driving chip 203, a backlight control circuit 204, and an ambient brightness acquisition module 205. The MCU201 may be responsible for controlling the PWM output to control the HUD virtual image brightness, while the MCU201 is responsible for monitoring the output power of the current backlight control circuit through the current acquisition circuit. The backlight driving chip 203 may be used to take charge of PWM boost and monitor for conventional open-circuit short-circuit faults. The current acquisition circuit 202 may be used to monitor the output of the backlight control circuit 204 and feed it back to the MCU201 via the a/D interface. The ambient brightness acquisition module 205 may be configured to send the actual ambient brightness acquired in real time to the MCU201. The MCU, the current acquisition circuit, the backlight driving chip and the backlight control circuit can be internal modules of the HUD system; the ambient light collection module may be an internal module of the HUD system, or an external module. For example, the brightness value collected by the ambient brightness collecting module may be transmitted to the HUD device in a bus manner or an a/D transmission manner.
In this example embodiment, the method may include: and pre-establishing corresponding relation data between the ambient brightness and the HUD equipment display brightness, PWM output parameters and A/D feedback parameters.
Specifically, referring to fig. 3, establishing correspondence data between ambient brightness and HUD device display brightness, PWM output parameters, and a/D feedback parameters may include:
step S101, configuring a display brightness range corresponding to HUD equipment according to different ambient brightness;
step S102, calibrating a PWM output parameter range corresponding to the micro control unit based on the display brightness range;
step S103, calibrating the A/D feedback parameters corresponding to the backlight control circuit according to the PWM output parameter range;
and step S104, determining corresponding relation data between the ambient brightness and the HUD equipment display brightness, PWM output parameters and A/D feedback parameters according to the data calibration result.
Specifically, for the HUD device equipped on the vehicle, the correspondence between the ambient brightness and the pulse width modulation PWM output of the MCU may be calibrated in advance according to the actual application scenario. Specifically, the display luminance of the corresponding HUD device may be first configured for the ambient luminance. For example, the display brightness of the corresponding HUD device may be configured for the ambient brightness by means of real vehicle calibration; for example, the ambient brightness fed back by the real vehicle sensor, and the maximum and minimum brightness adjustable under the brightness, can be recorded; and multiple sets of data can be recorded that can cover the highest and lowest brightness of the environment.
In addition, in order to enable the display brightness of the HUD device to meet the comfort requirement of human eyes for viewing, corresponding display brightness ranges can be configured for different environmental brightnesses. For example, referring to a graph of the ratio of the ambient brightness to the brightness percentage of the HUD device display brightness shown in fig. 4, the image display brightness of the HUD device adaptively changes with the ambient brightness; configuring an adjustable range of display brightness of the corresponding HUD equipment for each environment brightness value, wherein the adjustable range prevents display information of an image of the HUD equipment from being invisible due to over darkness of the image by limiting the minimum brightness; by limiting the maximum brightness in the adjustable range, the driver can be prevented from dazzling due to the excessive brightness of the image, and the driving safety is further influenced. Wherein, the unit of ambient light brightness is candela per square meter (cd/square meter); luminance (also called luminous efficiency) refers to the brightness of a surface, denoted by L, i.e. the luminous flux reflected from a surface; or the luminous intensity of the surface light source per unit projected area in a certain direction along that direction.
During calibration, based on the system architecture shown in fig. 2, different PWM outputs are controlled by the MCU, so that the display brightness of the HUD display device is in a corresponding display brightness range under different environment brightness; and simultaneously recording the A/D values fed back by the current acquisition circuit under different PWM outputs. And establishing a coordinate system with the PWM output value as an x axis and the A/D feedback value as a y axis to obtain a curve as shown in fig. 5, wherein the calibrated range covers the complete range of PWM output.
Based on the above, the corresponding relation data among the ambient brightness, the HUD display brightness, the PWM output parameter and the A/D feedback parameter can be constructed, and the corresponding relation data table can be established according to the corresponding relation data.
In step S11, the ambient brightness may be collected in real time by using the ambient brightness collection module as shown in fig. 2, and used as a current ambient brightness parameter, and real-time automatic adjustment of the display brightness of the HUD device may be triggered based on the current ambient brightness parameter.
In this example embodiment, in the step S11, the determining, according to the current ambient brightness parameter, a target PWM output parameter corresponding to a micro control unit of the HUD device includes:
step S111, determining target display brightness corresponding to HUD equipment according to the current ambient brightness parameter;
and step S112, determining a target PWM output parameter corresponding to the micro control unit based on the target display brightness.
In this example embodiment, the step S111 may specifically include:
step S1111, determining a display brightness range corresponding to the HUD device according to the current ambient brightness parameter based on a preset corresponding relation between the ambient brightness and the display brightness of the HUD device;
step S1112, configuring the target display brightness according to the intermediate value of the display brightness range.
Specifically, for the display brightness range corresponding to each ambient brightness, the display brightness range can be divided into a plurality of continuous display brightness gear intervals; for example, it may be divided into 10 consecutive display luminance range sections. After determining the current ambient brightness value, table look-up operation may be performed based on the above-mentioned correspondence data, to determine a corresponding display brightness range section, and the value of the middle gear of the display brightness range section is configured as the target display brightness.
In this example embodiment, the step S112 may specifically include: and determining a target PWM output parameter corresponding to the target display brightness based on a preset corresponding relation between the HUD device display brightness and the PWM output value.
Specifically, after determining the value of the target display brightness, a table look-up operation may be performed to determine the PWM output parameter of the MCU corresponding to the target display brightness according to the preset correspondence data, and configure the PWM output parameter as the value D of the target PWM output parameter Raw . In determining the value D of the target PWM output parameter Raw Then, the MCU executes the value of the target PWM output parameter, outputs the PWM of the value to the backlight driving chip, and then controls the backlight control circuit to control the display brightness of the HUD virtual image.
In this example embodiment, in the step S11, the determining the maximum PWM output parameter corresponding to the current ambient brightness parameter includes:
step S113, determining the maximum display brightness according to the display brightness range corresponding to the current environment brightness parameter;
step S114, determining the maximum PWM output parameter corresponding to the maximum display brightness based on a preset correspondence between the HUD device display brightness and the PWM output value.
Specifically, after determining the display brightness range of the HUD device corresponding to the current ambient brightness value, the maximum display brightness may be configured according to the maximum value of the range, and the PWM output value corresponding to the maximum display brightness may be configured as the maximum PWM output parameter D Max I.e. the maximum display luminance value corresponding to the virtual image that the HUD device is allowed to output at the current ambient luminance.
Alternatively, in some exemplary embodiments, the array of correspondence between ambient brightness values and PWM output parameters is ordered based on the determined correspondence data described above, i.e., the PWM output parameters are incremented with ambient brightness values. Specifically, the ambient brightness value of the middle position of the relation array can be obtained, and the ambient brightness value of the middle position is compared with the current ambient brightness value; if the ambient brightness value of the middle position of the relation array is equal to the current ambient brightness value, the ambient brightness value of the middle position can be used as the target value of the current ambient brightness.
Or if the ambient brightness value of the middle position of the relation array is greater than the current ambient brightness value, because the relation array is orderly (the ambient brightness value increases), the target value of the current ambient brightness is continuously acquired in the subarray on the left side of the ambient brightness value of the middle position (the subarray does not contain the ambient brightness value of the middle position).
Or if the ambient brightness value of the middle position of the relation array is smaller than the current ambient brightness value, because the relation array is orderly (the ambient brightness value is increased), the target value of the current ambient brightness is continuously acquired in the subarray on the right side of the ambient brightness value of the middle position (the subarray does not contain the ambient brightness value of the middle position).
Because of the corresponding relation between the ambient brightness value and the display brightness of the HUD equipment and the PWM output parameters of the MCU, after the ambient brightness value is determined, the parameter range of the PWM output parameters corresponding to the current ambient brightness value can be directly determined by carrying out table lookup operation on the corresponding relation data. The intermediate value of the parameter range may be configured as the target PWM output parameter. Meanwhile, the maximum value of the parameter range of the PWM output parameter corresponding to the current ambient brightness value may be configured as the maximum PWM output parameter.
Through the above-mentioned exemplary embodiment, after obtaining the corresponding maximum PWM output parameter under the current ambient brightness parameter, in step S12, the a/D feedback parameter corresponding to the maximum PWM output parameter may be directly determined as the maximum a/D feedback parameter V based on the above-mentioned correspondence data through a table lookup operation Max . Specifically, referring to the circuit shown in fig. 2, the current acquisition circuit is connected with the backlight control circuit, acquires the output of the backlight control circuit, and can feed back to the MCU through the a/D feedback interface.
By the above example embodiment, the target PWM output parameter D is executed at the MCU Raw After the backlight driving chip controls the backlight control circuit, in step S13, the current collecting circuit may also monitor and collect data of the output of the backlight control circuit in real time to obtain the value V of the current a/D feedback parameter raw . For example, the current A/D feedback parameter V is periodically collected for a preset time period raw . At the same time, the current A/D feedback parameter V raw With maximum A/D feedback parameter V Max And comparing, and judging whether the current display brightness of the HUD device exceeds the maximum display brightness under the environment brightness.
In this example embodiment, in the step S13, the determining whether to adjust the target PWM output parameter according to the parameter comparison result includes any one of the following determination results:
If the current A/D feedback parameter is larger than the maximum A/D feedback parameter, calculating an adjustment ratio of the A/D feedback parameter according to the current A/D feedback parameter and the maximum A/D feedback parameter, and calculating an adjustment range from the current A/D feedback parameter to the target PWM output parameter based on the adjustment ratio so as to control the target PWM output parameter according to the adjustment range; or,
if the current A/D feedback parameter is smaller than the minimum A/D feedback parameter, calculating an adjustment ratio of the A/D feedback parameter according to the current A/D feedback parameter and the minimum A/D feedback parameter, and calculating an adjustment range from the current A/D feedback parameter to the target PWM output parameter based on the adjustment ratio so as to control the target PWM output parameter according to the adjustment range.
Specifically, if the current a/D feedback parameter is greater than the maximum a/D feedback parameter, it indicates that the current display brightness of the HUD device is greater than the corresponding preset maximum display brightness under the current ambient brightness, and at this time, the PWM output parameter of the MCU may be adjusted down, thereby reducing the display brightness of the HUD device to the preset brightness range. Meanwhile, the adjustment proportion of the A/D feedback parameter can be calculated according to the current A/D feedback parameter and the maximum A/D feedback parameter. Specifically, the calculation formula may include: k (K) 1 ＝(V raw -V max )/V max *100％。
From this falling proportion, the falling amplitude of the PWM output parameter may be calculated, and the calculation formula may include: Δduty=pwm Duty Current (1-K 1 )。
In addition, when the maximum PWM output parameter corresponding to the current ambient brightness parameter is determined, the minimum PWM output parameter corresponding to the current ambient brightness parameter, the minimum A/D feedback parameter and the minimum display brightness of the HUD device can be determined through table lookup operation. If the current A/D feedback parameter is smaller than the minimum A/D feedback parameter, the current display brightness of the HUD equipment is smaller than the corresponding preset minimum display brightness under the current environment brightness, and the PWM output parameter of the MCU can be increased at the moment, so that the current display brightness of the HUD equipment is increased to a preset display brightness range.
In this example embodiment, referring to fig. 6, the method further includes:
step S21, calibrating the brightness change duration of the display brightness of the HUD equipment;
and step S22, determining the brightness change rate based on the brightness change duration, and adjusting the target PWM output parameter according to the brightness change rate.
Specifically, the time Δt of the brightness change can be calibrated according to the comfort level of the brightness change actually perceived by the human eye. Calculating a display brightness change rate according to the determined PWM change amplitude, the calculation formula may include: v (V) Pwmduty = Δduty/Δt. After the continuous reading change speed and the brightness change time period are determined, the MCU can control the change speed of PWM and adjust the PWM within the appointed change time period. By the method, uniform reduction of display brightness can be realized, and the comfort requirement of human eyes on brightness change is met.
Alternatively, in the present exemplary embodiment, the change time of the luminance may be calculated using the following formula; the specific formula may include: y=k x++m; wherein K and M are calibration coefficients, x is time, and y is PWMduty. By the calculation mode, the linear change of the display brightness change time can be realized, and the comfort level is improved.
Alternatively, in the present exemplary embodiment, for the HUD display device, the rate of change of the display luminance that satisfies the comfort of the person may be set in advance, so that the luminance change period of the display luminance of the HUD device is controlled with the determined rate of change. From this brightness change duration, the rate of change of the MCU control PWM can be determined.
Alternatively, in the present exemplary embodiment, if the acquired A/D feedback value V raw Always less than or equal to the maximum A/D feedback parameter V Max And is greater than or equal to the minimum A/D feedback parameter V Min The PWM output need only be adaptively adjusted based on ambient brightness.
In this example embodiment, the HUD device may also adjust the display brightness according to the instruction of the user. The instruction of the user may be input through control operation of the vehicle system, or input according to a voice instruction of the user, or the like. The user instruction may include, among other things, a display brightness value of the HUD. After receiving the custom display brightness value of the user instruction, whether the custom value is within the display brightness range of the HUD device corresponding to the current environment brightness parameter can be judged. If the brightness value is within the range, the custom display brightness value can be executed; if the range is exceeded, a corresponding hint may be generated or only the maximum or minimum of the range may be executed.
The HUD equipment display brightness adjusting method provided by the embodiment of the disclosure can calibrate the ambient brightness and the HUD equipment display brightness in advance, calibrate the PWM output and the A/D (analog-digital conversion) feedback value acquired by the current acquisition circuit, establish a corresponding data corresponding relation and construct a data table; the calibration result may be described in one data table, or may be described by using two data tables. When the display brightness of the HUD device is automatically controlled, referring to fig. 7, S701, the ambient brightness may be obtained in real time; s702, obtaining a target PWM output parameter PWM Duty D according to the ambient brightness table look-up calculation raw The method comprises the steps of carrying out a first treatment on the surface of the S703, calculating the maximum PWM output parameter PWM Duty D according to the ambient brightness table Max The method comprises the steps of carrying out a first treatment on the surface of the S704, calculating the maximum A/D feedback parameter V corresponding to the maximum allowable output current according to the maximum PWM output parameter table Max The method comprises the steps of carrying out a first treatment on the surface of the S705, sampling and reading the current A/D feedback parameter V by a current sampling circuit raw The method comprises the steps of carrying out a first treatment on the surface of the S706, judging the current A/D feedback parameter V raw Whether or not it is greater than the maximum A/D feedback parameter V Max The method comprises the steps of carrying out a first treatment on the surface of the S707, if the judgment is larger than the target PWM output parameter is reduced; and S708, if the PWM output parameter is not greater than the current calculated target PWM output parameter, outputting the PWM output parameter. And if the acquired A/D feedback value V raw Greater than V max The magnitude deltaduty by which the PWM needs to be reduced can be calculated and uniformly reduced to the corresponding target value. If the acquired A/D feedback value V raw Always less than or equal to V Max The PWM output adjustment need only be performed according to the automatic brightness adjustment logic.
According to the method, the output current of the backlight control circuit is monitored in real time by utilizing the current detection circuit, so that the virtual image brightness output by the HUD device can be acquired fundamentally and accurately in real time. Even if software abnormality and/or hardware partial failure occur, the display brightness of the virtual image output by the HUD can still be monitored and limited by utilizing the corresponding relation data of the calibrated ambient brightness and the A/D feedback parameters according to the collected current value of the backlight control circuit. Compared with the traditional automatic brightness adjustment scheme, the automatic brightness adjustment scheme can only logically ensure that the output brightness does not exceed the design range, and for the situations that the actual condition of a rear-stage actual driving circuit cannot be monitored, open-loop control and the output validity cannot be ensured in the hardware principle, the scheme ensures the output to feedback closed-loop processing from the hardware level, ensures the output validity and prevents the risk caused by too high brightness to driving.
It is noted that the above-described figures are only schematic illustrations of processes involved in a method according to an exemplary embodiment of the invention, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
Further, referring to fig. 8, in this exemplary embodiment, there is also provided a display brightness adjusting device 800 of a HUD apparatus, including: an ambient brightness acquisition module 801, a micro control unit 802 and a current acquisition circuit 803. Wherein,
the ambient brightness acquisition module 801 may be configured to acquire a current ambient brightness parameter.
The micro-control unit 802 may be configured to determine a target PWM output parameter corresponding to the micro-control unit according to the current ambient brightness parameter, and determine a maximum PWM output parameter corresponding to the current ambient brightness parameter; determining a corresponding maximum A/D feedback parameter according to the maximum PWM output parameter; the PWM output parameter is used for controlling the display brightness of the HUD device, and the A/D feedback parameter is used for representing the output of the backlight control circuit.
The current collection circuit 803 may be configured to collect a current a/D feedback parameter corresponding to the backlight control circuit and feed back the current a/D feedback parameter to the micro control unit 802, so that the micro control unit may be configured to compare the current a/D feedback parameter with a maximum a/D feedback parameter to determine whether to adjust the target PWM output parameter.
In some exemplary embodiments, the micro control unit 802 may include: and a target PWM output parameter calculation module.
The target PWM output parameter calculation module can be used for determining a display brightness range corresponding to the HUD equipment according to the current environment brightness parameter based on a preset corresponding relation between the environment brightness and the display brightness of the HUD equipment; configuring the target display brightness according to the intermediate value of the display brightness range; and determining a target PWM output parameter corresponding to the target display brightness based on a preset corresponding relation between the HUD device display brightness and the PWM output value.
In some exemplary embodiments, the micro control unit 802 may further include: and a maximum PWM output parameter calculation module.
The maximum PWM output parameter calculation module can be used for determining the maximum display brightness according to the display brightness range corresponding to the current environment brightness parameter; and determining the maximum PWM output parameter corresponding to the maximum display brightness based on a preset corresponding relation between the display brightness of the HUD equipment and the PWM output value.
In some exemplary embodiments, the micro control unit 802 may further include: and the maximum A/D feedback parameter calculation module.
The maximum A/D feedback parameter calculation module may be configured to determine the maximum A/D feedback parameter corresponding to the maximum PWM output parameter based on a preset correspondence between the PWM output parameter and the A/D feedback parameter.
In some exemplary embodiments, the micro control unit 802 may further include: and (5) a parameter comparison module.
The parameter comparison module can be used for calculating the adjustment proportion of the A/D feedback parameter according to the current A/D feedback parameter and the maximum A/D feedback parameter if the current A/D feedback parameter is larger than the maximum A/D feedback parameter; calculating the adjustment amplitude from the current A/D feedback parameter to the target PWM output parameter based on the adjustment proportion, so as to control the target PWM output parameter according to the adjustment amplitude; or if the current A/D feedback parameter is smaller than the minimum A/D feedback parameter, calculating the adjustment proportion of the A/D feedback parameter according to the current A/D feedback parameter and the minimum A/D feedback parameter; and calculating the adjustment amplitude from the current A/D feedback parameter to the target PWM output parameter based on the adjustment proportion, so as to control the target PWM output parameter according to the adjustment amplitude.
In some exemplary embodiments, the HUD device display brightness adjusting apparatus further includes: and a change rate calculation module.
The change rate calculation module can be used for calibrating the brightness change duration of the display brightness of the HUD device; and determining the brightness change rate based on the brightness change duration, and adjusting the target PWM output parameter according to the brightness change rate.
In some exemplary embodiments, the HUD device display brightness adjusting apparatus further includes: and the relation data calibration module.
The relation data calibration module can be used for pre-establishing corresponding relation data between the ambient brightness and the HUD equipment display brightness, PWM output parameters and A/D feedback parameters.
In some exemplary embodiments, the relational data calibration module may be configured to configure a display brightness range corresponding to the HUD device according to different ambient brightness; calibrating a PWM output parameter range corresponding to the micro control unit based on the display brightness range; calibrating an A/D feedback parameter corresponding to the backlight control circuit according to the PWM output parameter range; and determining corresponding relation data between the ambient brightness and the HUD equipment display brightness, PWM output parameters and A/D feedback parameters according to the data calibration result.
The specific details of each module in the above-mentioned HUD device display brightness adjusting apparatus 800 are already described in detail in the corresponding HUD device display brightness adjusting method, and thus will not be described herein.
It should be noted that although in the above detailed description several modules or units of a device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied.
Fig. 9 shows a schematic diagram of an electronic device suitable for use in implementing embodiments of the invention.
It should be noted that the electronic device 1000 shown in fig. 9 is only an example, and should not impose any limitation on the functions and the application scope of the embodiments of the present disclosure.
As shown in fig. 9, the electronic apparatus 1000 includes a central processing unit (Central Processing Unit, CPU) 1001 that can perform various appropriate actions and processes according to a program stored in a Read-Only Memory (ROM) 1002 or a program loaded from a storage section 1008 into a random access Memory (Random Access Memory, RAM) 1003. In the RAM 1003, various programs and data required for system operation are also stored. The CPU 1001, ROM 1002, and RAM 1003 are connected to each other by a bus 1004. An Input/Output (I/O) interface 1005 is also connected to bus 1004.
The following components are connected to the I/O interface 1005: an input section 1006 including a keyboard, a mouse, and the like; an output portion 1007 including a Cathode Ray Tube (CRT), a liquid crystal display (Liquid Crystal Display, LCD), and a speaker; a storage portion 1008 including a hard disk or the like; and a communication section 1009 including a network interface card such as a LAN (Local Area Network ) card, a modem, or the like. The communication section 1009 performs communication processing via a network such as the internet. The drive 1010 is also connected to the I/O interface 1005 as needed. A removable medium 1011, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like, is installed on the drive 1010 as needed, so that a computer program read out therefrom is installed into the storage section 1008 as needed.
In particular, according to embodiments of the present invention, the processes described below with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program loaded on a storage medium, the computer program comprising program code for performing the method shown in the flowchart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication portion 1009, and/or installed from the removable medium 1011. When executed by a Central Processing Unit (CPU) 1001, the computer program performs various functions defined in the system of the present application.
Specifically, the electronic device may be an intelligent mobile electronic device such as a mobile phone, a tablet computer or a notebook computer. Alternatively, the electronic device may be an intelligent electronic device such as a desktop computer.
It should be noted that, the storage medium shown in the embodiments of the present invention may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-Only Memory (ROM), an erasable programmable read-Only Memory (Erasable Programmable Read Only Memory, EPROM), flash Memory, an optical fiber, a portable compact disc read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present invention, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any storage medium that is not a computer readable storage medium and that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a storage medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units involved in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, and the described units may also be provided in a processor. Wherein the names of the units do not constitute a limitation of the units themselves in some cases.
It should be noted that, as another aspect, the present application further provides a storage medium, which may be included in an electronic device; or may exist alone without being incorporated into the electronic device. The storage medium carries one or more programs which, when executed by an electronic device, cause the electronic device to implement the methods described in the embodiments below. For example, the electronic device may implement the steps shown in fig. 1.
Furthermore, the above-described drawings are only schematic illustrations of processes included in the method according to the exemplary embodiment of the present invention, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (11)

1. A HUD device display brightness adjustment method, the method comprising:
collecting a current environment brightness parameter, determining a target PWM output parameter corresponding to a micro control unit of HUD equipment according to the current environment brightness parameter, and determining a maximum PWM output parameter corresponding to the current environment brightness parameter;
determining a corresponding maximum A/D feedback parameter according to the maximum PWM output parameter; the PWM output parameter is used for controlling the display brightness of the HUD equipment, and the A/D feedback parameter is used for representing the output of the backlight control circuit;
collecting current A/D feedback parameters, and comparing the current A/D feedback parameters with the maximum A/D feedback parameters to determine whether to adjust the target PWM output parameters according to parameter comparison results;
wherein the determining whether to adjust the target PWM output parameter according to the parameter comparison result includes:
if the current A/D feedback parameter is larger than the maximum A/D feedback parameter, calculating an adjustment ratio of the A/D feedback parameter according to the current A/D feedback parameter and the maximum A/D feedback parameter, and calculating an adjustment range from the current A/D feedback parameter to the target PWM output parameter based on the adjustment ratio so as to control the target PWM output parameter according to the adjustment range.
2. The HUD device display brightness adjustment method according to claim 1, wherein the determining, according to the current ambient brightness parameter, a target PWM output parameter corresponding to a micro control unit of the HUD device includes:
based on a preset corresponding relation between the ambient brightness and the display brightness of the HUD equipment, determining a display brightness range corresponding to the HUD equipment according to the current ambient brightness parameter;
configuring the display brightness as target display brightness according to the intermediate value of the display brightness range;
and determining a target PWM output parameter corresponding to the target display brightness based on a preset corresponding relation between the HUD device display brightness and the PWM output value.
3. The HUD device display brightness adjustment method according to claim 2, wherein the determining a maximum PWM output parameter corresponding to the current ambient brightness parameter includes:
determining the maximum display brightness according to the display brightness range corresponding to the current environment brightness parameter;
and determining the maximum PWM output parameter corresponding to the maximum display brightness based on a preset corresponding relation between the display brightness of the HUD equipment and the PWM output value.
4. The HUD device display brightness adjustment method according to claim 1, wherein said determining a corresponding maximum a/D feedback parameter according to the maximum PWM output parameter comprises:
And determining the maximum A/D feedback parameter corresponding to the maximum PWM output parameter based on a preset corresponding relation between the PWM output parameter and the A/D feedback parameter.
5. The HUD device display brightness adjustment method according to claim 1, wherein the determining whether to adjust the target PWM output parameter according to the parameter comparison result further comprises:
if the current A/D feedback parameter is smaller than the minimum A/D feedback parameter, calculating an adjustment ratio of the A/D feedback parameter according to the current A/D feedback parameter and the minimum A/D feedback parameter, and calculating an adjustment range from the current A/D feedback parameter to the target PWM output parameter based on the adjustment ratio so as to control the target PWM output parameter according to the adjustment range.
6. The HUD device display brightness adjustment method according to claim 5, characterized in that the method further comprises:
calibrating the brightness change time length of the display brightness of the HUD equipment;
and determining the brightness change rate based on the brightness change duration, and adjusting the target PWM output parameter according to the brightness change rate.
7. The HUD device display brightness adjustment method according to claim 1, characterized in that the method further comprises: and pre-establishing corresponding relation data between the ambient brightness and the HUD equipment display brightness, PWM output parameters and A/D feedback parameters.
8. The HUD device display luminance adjustment method according to claim 7, wherein establishing correspondence data between the ambient luminance and the HUD device display luminance, the PWM output parameter, the a/D feedback parameter, comprises:
configuring a display brightness range corresponding to the HUD equipment according to different ambient brightness;
calibrating a PWM output parameter range corresponding to the micro control unit based on the display brightness range;
calibrating an A/D feedback parameter corresponding to the backlight control circuit according to the PWM output parameter range;
and determining corresponding relation data between the ambient brightness and the HUD equipment display brightness, PWM output parameters and A/D feedback parameters according to the data calibration result.
9. A HUD device display brightness adjustment apparatus, the apparatus comprising:
the environment brightness acquisition module is used for acquiring current environment brightness parameters;
the micro-control unit is used for determining a target PWM output parameter corresponding to the micro-control unit according to the current ambient brightness parameter and determining a maximum PWM output parameter corresponding to the current ambient brightness parameter; determining a corresponding maximum A/D feedback parameter according to the maximum PWM output parameter; the PWM output parameter is used for controlling the display brightness of the HUD equipment, and the A/D feedback parameter is used for representing the output of the backlight control circuit;
The current acquisition circuit is used for acquiring the current A/D feedback parameter corresponding to the backlight control circuit and feeding back the current A/D feedback parameter to the micro control unit, so that the micro control unit can compare the current A/D feedback parameter with the maximum A/D feedback parameter to judge whether to adjust the target PWM output parameter;
wherein determining whether to adjust the target PWM output parameter according to the parameter comparison result comprises:
if the current A/D feedback parameter is larger than the maximum A/D feedback parameter, calculating an adjustment ratio of the A/D feedback parameter according to the current A/D feedback parameter and the maximum A/D feedback parameter, and calculating an adjustment range from the current A/D feedback parameter to the target PWM output parameter based on the adjustment ratio so as to control the target PWM output parameter according to the adjustment range.
10. A storage medium having stored thereon a computer program which, when executed by a processor, implements the HUD device display brightness adjustment method according to any one of claims 1 to 8.
11. An electronic device, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the HUD device display brightness adjustment method of any of claims 1 to 8 via execution of the executable instructions.
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