CN109443533B - Method and device for calibrating backlight brightness of switch panel - Google Patents
Method and device for calibrating backlight brightness of switch panel Download PDFInfo
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- CN109443533B CN109443533B CN201811285702.3A CN201811285702A CN109443533B CN 109443533 B CN109443533 B CN 109443533B CN 201811285702 A CN201811285702 A CN 201811285702A CN 109443533 B CN109443533 B CN 109443533B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- 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
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Abstract
The invention discloses a method and a device for calibrating the backlight brightness of a switch panel, wherein the method comprises the following steps: obtaining the backlight intensity of a preset position corresponding to the light emitting diode on the switch panel; judging whether the backlight intensity is within the standard backlight intensity range; if not, determining the calibration duty ratio according to the backlight intensity, the first standard duty ratio and the light intensity standard median in the standard backlight intensity range, and replacing the first standard duty ratio with the calibration duty ratio. The calibration method and the calibration device provided by the invention calibrate the duty ratio of the control light emitting diode, adjust the actual backlight intensity of the switch panel which does not conform to the standard backlight intensity range under the typical voltage to the standard backlight intensity range by adjusting the duty ratio of the control diode to be lightened, and solve the problem of poor consistency of the backlight intensity of products in the same batch.
Description
Technical Field
The invention relates to the technical field of automotive interior trim, in particular to a method and a device for calibrating backlight brightness of a switch panel.
Background
At present, the core device for providing backlight for the switch panel is a light emitting diode, factors such as relevant parameters of the light emitting diode, a panel structure and materials and the like can influence the actual backlight brightness, and the backlight brightness consistency of products in the same batch can be poor due to no calibration, so that the brightness calibration for the switch panel is very necessary.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a method and an apparatus for calibrating backlight brightness of a switch panel, where the technical scheme is as follows:
a calibration method for backlight brightness of a switch panel comprises the following steps:
obtaining backlight intensity of a preset position on a switch panel corresponding to a light emitting diode, wherein the backlight intensity is the backlight intensity of the preset position when the working voltage of the light emitting diode is a first preset voltage and when the lighting frequency corresponds to a first standard duty ratio;
judging whether the backlight intensity is in a standard backlight intensity range;
if not, determining a calibration duty ratio according to the backlight intensity, the first standard duty ratio and a light intensity standard median value in the standard backlight intensity range;
replacing the first standard duty cycle with the nominal duty cycle.
Preferably, the determining a calibration duty cycle according to the backlight intensity, the first standard duty cycle and the light intensity standard median value in the standard backlight intensity range includes:
determining a duty ratio adjustment coefficient according to the backlight intensity and the light intensity standard median value;
and multiplying the duty ratio adjusting coefficient by the first standard duty ratio to obtain the calibration duty ratio.
Preferably, the method further comprises the following steps:
obtaining a target backlight intensity of the preset position, wherein the target backlight intensity is the backlight intensity at the preset position when the working voltage of the light emitting diode is a first preset voltage and the lighting frequency corresponds to the calibration duty ratio;
judging whether the target backlight intensity is within the standard backlight intensity range;
and if so, adjusting a second standard duty ratio corresponding to a second preset voltage by using the duty ratio adjustment coefficient.
Preferably, the method further comprises the following steps:
judging whether the calibration duty ratio is in a standard duty ratio range or not;
and if so, replacing the first standard duty ratio with the calibration duty ratio.
Preferably, when the number of the light emitting diodes is N, N is greater than or equal to 2 and is a positive integer, the method further includes:
determining a maximum backlight intensity and a minimum backlight intensity from the N backlight intensities obtained from the preset positions corresponding to the N light emitting diodes one to one;
accordingly, determining whether the backlight intensity is within a standard backlight intensity range includes:
judging whether the maximum backlight intensity and the minimum backlight intensity are in a standard backlight intensity range or not;
replacing the backlight intensity with the maximum backlight intensity to determine the nominal duty cycle when both the maximum backlight intensity and the minimum backlight intensity are greater than a light intensity standard upper limit value in the standard backlight intensity range or only the maximum backlight intensity is not within the standard backlight intensity range;
and when the maximum backlight intensity and the minimum backlight intensity are both smaller than the lower limit value of the light intensity standard in the standard backlight intensity range or only the minimum backlight intensity is not in the standard backlight intensity range, replacing the backlight intensity with the minimum backlight intensity to determine the calibration duty ratio.
A calibration device for backlight brightness of a switch panel comprises:
the backlight control device comprises a first obtaining unit, a second obtaining unit and a control unit, wherein the first obtaining unit is used for obtaining the backlight intensity of a preset position corresponding to a light emitting diode on a switch panel, and the backlight intensity is the backlight intensity of the preset position when the working voltage of the light emitting diode is a first preset voltage and the lighting frequency corresponds to a first standard duty ratio;
a first judging unit for judging whether the backlight intensity is within a standard backlight intensity range;
the calculation unit is used for determining a calibration duty ratio according to the backlight intensity, the first standard duty ratio and a light intensity standard median value in the standard backlight intensity range when the backlight intensity is determined not to be in the standard backlight intensity range;
a replacing unit for replacing the first standard duty cycle with the calibration duty cycle.
Preferably, the calculation unit includes:
the first determining unit is used for determining a duty ratio adjusting coefficient according to the backlight intensity and the light intensity standard median;
and the second determining unit is used for multiplying the duty ratio adjusting coefficient by the first standard duty ratio to obtain the calibration duty ratio.
Preferably, the method further comprises the following steps:
a second obtaining unit, configured to obtain a target backlight intensity at the preset position, where the target backlight intensity is a backlight intensity at the preset position when a working voltage of the light emitting diode is a first preset voltage and a lighting frequency corresponds to the calibration duty ratio;
a second judging unit, configured to judge whether the target backlight intensity is within the standard backlight intensity range;
and the adjusting unit is used for adjusting a second standard duty ratio corresponding to a second preset voltage by using the duty ratio adjusting coefficient when the target backlight intensity is determined to be in the standard backlight intensity range.
Preferably, the method further comprises the following steps:
the third judging unit is used for judging whether the calibration duty ratio is in a standard duty ratio range or not;
when it is determined that the nominal duty cycle is within the standard duty cycle range, performing the step of replacing the first standard duty cycle with the nominal duty cycle.
Preferably, when the number of the light emitting diodes is N, N is greater than or equal to 2 and is a positive integer, the method further includes:
a third determining unit configured to determine a maximum backlight intensity and a minimum backlight intensity from N backlight intensities obtained from the preset positions corresponding to the N light emitting diodes one to one;
correspondingly, the first judging unit is specifically configured to:
judging whether the maximum backlight intensity and the minimum backlight intensity are in a standard backlight intensity range or not;
the calculation unit includes:
a first calculating subunit, configured to, when both the maximum backlight intensity and the minimum backlight intensity are greater than a light intensity standard upper limit value in the standard backlight intensity range or only the maximum backlight intensity is not within the standard backlight intensity range, replace the backlight intensity with the maximum backlight intensity to determine the calibration duty cycle;
a second calculating subunit, configured to, when both the maximum backlight intensity and the minimum backlight intensity are smaller than a light intensity standard lower limit value in the standard backlight intensity range or only the minimum backlight intensity is not within the standard backlight intensity range, replace the backlight intensity with the minimum backlight intensity to determine the calibration duty cycle.
According to the technical scheme provided by the embodiment of the invention, when the voltage of the light emitting diode is the first preset voltage, the lighting frequency of the light emitting diode is controlled by using the first standard duty ratio, the backlight intensity of the preset position on the switch panel is obtained, when the backlight intensity is not in the range of the standard backlight intensity, the calibration duty ratio is determined, and the calibration duty ratio is used for replacing the first standard duty ratio. According to the embodiment of the invention, the duty ratio of the control light emitting diode is calibrated, the actual backlight intensity of the switch panel which does not conform to the standard backlight intensity range under the typical voltage is adjusted to the standard backlight intensity range by adjusting the lighting duty ratio of the control diode, and the problem of poor backlight intensity consistency of products in the same batch is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for calibrating backlight brightness of a switch panel according to an embodiment of the present invention;
fig. 2 is another schematic flow chart of a method for calibrating backlight brightness of a switch panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a calibration apparatus for backlight brightness of a switch panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a method for calibrating backlight brightness of a switch panel according to an embodiment of the present invention, where the method includes:
and S101, obtaining the backlight intensity of a preset position corresponding to the light emitting diode on the switch panel.
The backlight intensity is the backlight intensity at the preset position of the switching panel product to be tested when the working voltage of the light emitting diode is the first preset voltage and the lighting frequency corresponds to the first standard duty ratio.
The present embodiment uses PWM to control the leds to provide backlight for the switch panel, and the duty cycle of the PWM determines the switching frequency of the leds. The standard duty ratio is obtained after a standard sample piece of the switch panel is tested. Specifically, within the range of 8-16V, typical voltages are selected to test the standard sample, and when the backlight intensities of the preset positions of the standard sample are the same under each selected typical voltage, the recorded duty ratio is the standard duty ratio, and at this time, the backlight intensity of the standard sample at the preset position is within the standard backlight intensity range, and the standard backlight intensity range is specified by the whole vehicle factory.
When typical voltages are selected, integer-valued voltages of an arithmetic series are selected, and in actual tests, 8V, 9V, 10V, 11V, 12V, 13V, 14V, 15V and 16V can be selected as the typical voltages. The first preset voltage in the present embodiment may be any one of the above-described typical voltages. The first standard duty cycle is a standard duty cycle of the control diode, which is obtained by testing the standard sample piece and corresponds to the first preset voltage. When the backlight intensity of the preset position of the standard sample piece is the same, the standard duty ratios corresponding to different typical voltages are different.
Step S102, judging whether the backlight intensity is in the standard backlight intensity range, and if not, executing step S103.
And judging the backlight intensity obtained by testing the switch panel sample by using the standard backlight intensity range to obtain whether the backlight intensity of the preset position of the switch panel to be tested under the first preset voltage meets the requirement or not.
And S103, determining a calibration duty ratio according to the backlight intensity, the first standard duty ratio and a light intensity standard median value in the standard backlight intensity range.
The standard backlight intensity range comprises three typical values, namely an upper light intensity standard limit value which is the maximum light intensity value according with the standard backlight intensity; the light intensity standard lower limit value is the minimum light intensity value which accords with the standard backlight intensity; the standard median value of the light intensity is the median value in the standard backlight intensity. The three values are given by the whole factory with corresponding values.
And step S104, replacing the first standard duty ratio with the calibration duty ratio.
Under the influence of materials such as the switch panel and the structure, the switch panel in this embodiment does not necessarily meet the requirements of the standard sample, and therefore, when the light emitting diode is controlled to provide backlight to the switch panel according to the first preset voltage and the first standard duty ratio, the backlight intensity at the preset position of the switch panel is not necessarily within the standard backlight intensity range.
The theoretical research shows that when the voltage is constant, the light intensity of the light emitting diode and the duty ratio of the PWM form a nearly linear relationship, so that when the backlight intensity at the preset position of the switch panel is not in the standard backlight intensity range, the calibration duty ratio is determined according to the backlight intensity, the first standard duty ratio and the light intensity standard median value in the standard backlight intensity range, and the first standard duty ratio is replaced by the calibration duty ratio. The backlight intensity of the light emitting diodes under the first preset voltage can be adjusted to be within the standard backlight intensity range through calibration of the first standard duty ratio.
In another embodiment of the invention, when the calibration duty ratio is determined, the duty ratio adjustment coefficient can be determined according to the backlight intensity and the light intensity standard median, and then the duty ratio adjustment coefficient is multiplied by the first standard duty ratio to obtain the calibration duty ratio.
In practical application, the formula for determining the calibration duty ratio is as follows:
p＝(Mid/a)*pd；
wherein p is a calibration duty ratio, pd is a first standard duty ratio, Mid is a light intensity standard median, and a is the backlight intensity at the preset position of the switch panel; the adjustment coefficient m is Mid/a.
In another embodiment of the present invention, when N (N is greater than or equal to 2 and is a positive integer) light emitting diodes controlled by the same PWM are provided, backlight intensities at N preset positions on the switch panel corresponding to the N light emitting diodes one to one, that is, N backlight intensities, are obtained, at this time, in order to improve the calibration efficiency, before judging whether the backlight intensity is within the standard backlight intensity range, a maximum backlight intensity and a minimum backlight intensity are determined from the N backlight intensities, and a calibration duty ratio is determined according to the maximum backlight intensity and the minimum backlight intensity. Specifically, the method comprises the following steps:
when the maximum backlight intensity and the minimum backlight intensity are both greater than the light intensity standard upper limit value in the standard backlight intensity range or only the maximum backlight intensity is not in the standard backlight intensity range, replacing the backlight intensity in the step S103 with the maximum backlight intensity to determine the calibration duty ratio;
and when the maximum backlight intensity and the minimum backlight intensity are both smaller than the light intensity standard lower limit value in the standard backlight intensity range or only the minimum backlight intensity is not in the standard backlight intensity range, replacing the backlight intensity in the step S103 with the minimum backlight intensity to determine the calibration duty ratio.
In addition, when the maximum backlight intensity and the minimum backlight intensity are both in the standard backlight intensity range, the switch panel is in accordance with the requirements, and calibration is not needed;
and when the maximum backlight intensity is greater than the light intensity standard upper limit value in the standard backlight intensity range and the minimum backlight intensity is less than the light intensity standard lower limit value in the standard backlight intensity range, the switch panel cannot be calibrated, and the process is ended.
According to the technical scheme provided by the embodiment of the invention, when the voltage of the light emitting diode is the first preset voltage, the lighting frequency of the light emitting diode is controlled by using the first standard duty ratio, the backlight intensity of the preset position on the switch panel is obtained, when the backlight intensity is not in the range of the standard backlight intensity, the calibration duty ratio is determined, and the calibration duty ratio is used for replacing the first standard duty ratio. According to the embodiment of the invention, the duty ratio of PWM for controlling the light emitting diodes is calibrated, and the actual backlight intensity of the panel which does not conform to the standard backlight intensity range under the typical voltage is adjusted to the standard backlight intensity range by adjusting the duty ratio of the control diodes to be lightened, so that the problem of poor backlight intensity consistency of products in the same batch is solved.
Referring to fig. 2, fig. 2 is a flowchart illustrating another implementation of a method for calibrating backlight brightness of a switch panel according to an embodiment of the present invention, the method including:
step S201, obtaining the backlight intensity of the preset position corresponding to the light emitting diode on the switch panel.
The backlight intensity is the backlight intensity at the preset position when the working voltage of the light emitting diode is the first preset voltage and the lighting frequency corresponds to the first standard duty ratio.
Step S202, determining whether the backlight intensity is within the standard backlight intensity range, and if not, executing step S203.
And S203, determining a calibration duty ratio according to the backlight intensity, the first standard duty ratio and a light intensity standard median value in the standard backlight intensity range.
Optionally, the execution process of steps S201 to S203 is the same as the execution process of steps S101 to S103 provided in the above embodiment, and for the detailed process of steps S201 to S203, please refer to the description of steps S101 to S103, which is not described herein again.
And S204, judging whether the calibration duty ratio is in the standard duty ratio range, if so, executing S205.
The standard duty ratio range is determined by the minimum lighting duty ratio Min _ PWM of the light emitting diode and the maximum duty ratio Max _ PWM determined in the laboratory. When the voltage at two ends of the light-emitting diode is constant, the service life of the light-emitting diode is influenced after the duty ratio exceeds Max _ PWM, and if the duty ratio is too low, the average voltage may not be enough to meet the lighting voltage requirement of the light-emitting diode. Therefore, in order to ensure the service life of the light emitting diode and meet the requirement of the lighting voltage of the light emitting diode, the calibration duty ratio needs to be verified.
And S205, replacing the first standard duty ratio with the calibration duty ratio.
And step S206, obtaining the target backlight intensity of the preset position.
The target backlight intensity is the backlight intensity at a preset position when the working voltage of the light emitting diode is a first preset voltage and the lighting frequency corresponds to the calibration duty ratio.
Step S207, determining whether the target backlight intensity is within the standard backlight intensity range, if yes, executing step S208.
And S208, adjusting a second standard duty ratio corresponding to a second preset voltage by using the duty ratio adjusting coefficient.
And after the calibration duty ratio is determined, obtaining the target backlight intensity by using the calibration duty ratio, judging the target backlight intensity, and indicating that the calibration is successful when the target backlight intensity is within the standard backlight intensity range. At this time, the calibration of the standard duty ratios corresponding to other typical voltages can be completed by multiplying the standard duty ratios corresponding to other typical voltages except for the first preset voltage by the adjustment coefficient m, wherein the second preset voltage belongs to other typical voltages, and the second standard duty ratio belongs to the standard duty ratios of other typical voltages.
In practical application, after the duty ratio calibration is completed, the calibration duty ratio and the second standard duty ratio may be stored in the EEPROM for subsequent invocation.
According to the technical scheme provided by the embodiment of the invention, when the voltage of the light emitting diode is the first preset voltage, the lighting frequency of the light emitting diode is controlled by using the first standard duty ratio, the backlight intensity of the preset position on the switch panel is obtained, when the backlight intensity is not in the range of the standard backlight intensity, the calibration duty ratio is determined, and the calibration duty ratio is used for replacing the first standard duty ratio. According to the embodiment of the invention, the duty ratio of PWM for controlling the light emitting diodes is calibrated, and the actual backlight intensity of the panel which does not conform to the standard backlight intensity range under the typical voltage is adjusted to the standard backlight intensity range by adjusting the duty ratio of the control diodes to be lightened, so that the problem of poor backlight intensity consistency of products in the same batch is solved. In addition, in this embodiment, after the calibration of the standard duty ratio corresponding to the first preset voltage is completed, the calibration of the second standard duty ratio is also completed by using the adjustment coefficient m, so that the calibration efficiency is improved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a calibration apparatus for backlight brightness of a switch panel according to an embodiment of the present invention, where the working process of each module in the schematic structural diagram refers to the execution process of the method in the corresponding embodiment of fig. 1, and the apparatus includes:
the first obtaining unit 310 is configured to obtain a backlight intensity of a preset position on the switch panel corresponding to the light emitting diode.
The backlight intensity is the backlight intensity at the preset position when the working voltage of the light emitting diode is the first preset voltage and the lighting frequency corresponds to the first standard duty ratio.
The first determining unit 320 is configured to determine whether the backlight intensity is within a standard backlight intensity range.
And the calculating unit 330 is configured to determine the calibration duty ratio according to the backlight intensity, the first standard duty ratio and a light intensity standard median value in the standard backlight intensity range when it is determined that the backlight intensity is not within the standard backlight intensity range.
A replacing unit 340 for replacing the first standard duty cycle with the nominal duty cycle.
According to the technical scheme provided by the embodiment of the invention, when the voltage of the light emitting diode is the first preset voltage, the lighting frequency of the light emitting diode is controlled by using the first standard duty ratio, the backlight intensity of the preset position on the switch panel is obtained, when the backlight intensity is not in the range of the standard backlight intensity, the calibration duty ratio is determined, and the calibration duty ratio is used for replacing the first standard duty ratio. According to the embodiment of the invention, the duty ratio of PWM for controlling the light emitting diode is calibrated, and the actual backlight intensity of the panel which does not conform to the standard backlight intensity range under the typical voltage is adjusted to the standard backlight intensity range by adjusting the PWM duty ratio of the control diode, so that the problem of poor backlight intensity consistency of products in the same batch is solved.
In another embodiment of the present invention, the calculating unit 330 includes:
the first determining unit is used for determining a duty ratio adjusting coefficient according to the backlight intensity and the light intensity standard median value;
and the second determining unit is used for multiplying the duty ratio adjusting coefficient by the first standard duty ratio to obtain the calibration duty ratio.
In another embodiment of the present invention, the method further comprises:
a second obtaining unit, configured to obtain a target backlight intensity at a preset position on the switch panel, where the target backlight intensity is the backlight intensity at the preset position when the operating voltage of the light emitting diode is the first preset voltage and the lighting frequency corresponds to the calibration duty ratio;
a second judging unit for judging whether the target backlight intensity is within the standard backlight intensity range;
and an adjusting unit for adjusting a second standard duty ratio corresponding to a second preset voltage by using the duty ratio adjustment coefficient when the target backlight intensity is determined to be within the standard backlight intensity range.
In another embodiment of the present invention, the method further comprises:
the third judging unit is used for judging whether the calibration duty ratio is in the standard duty ratio range;
when it is determined that the nominal duty cycle is within the standard duty cycle range, the step of replacing the first standard duty cycle with the nominal duty cycle is performed.
In another embodiment of the present invention, when there are N light emitting diodes, N is greater than or equal to 2 and is a positive integer, the method further includes:
a third determining unit configured to determine a maximum backlight intensity and a minimum backlight intensity from the acquired N backlight intensities one-to-one corresponding to the N light emitting diodes;
accordingly, the first determining unit 320 is specifically configured to:
judging whether the maximum backlight intensity and the minimum backlight intensity are in a standard backlight intensity range or not;
a calculation unit 330, comprising:
a first calculating subunit, configured to, when it is determined that both the maximum backlight intensity and the minimum backlight intensity are greater than the light intensity standard upper limit value in the standard backlight intensity range or only the maximum backlight intensity is not within the standard backlight intensity range, replace the backlight intensity with the maximum backlight intensity to determine the calibration duty ratio;
and the second calculating subunit is used for replacing the backlight intensity with the minimum backlight intensity to determine the calibration duty ratio when the maximum backlight intensity and the minimum backlight intensity are determined to be smaller than the lower limit value of the light intensity standard in the standard backlight intensity range or only the minimum backlight intensity is not in the standard backlight intensity range.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For device or system embodiments, as they correspond substantially to method embodiments, reference may be made to the method embodiments for some of their descriptions. The above-described embodiments of the apparatus or system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In the several embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways without departing from the spirit and scope of the present invention. The present embodiment is an exemplary embodiment only, and should not be taken as limiting, and the specific contents given should not limit the object of the present invention. For example, the division of the unit or the sub-unit is only one logical function division, and there may be another division manner in actual implementation, for example, a plurality of units or a plurality of sub-units are combined together. In addition, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.
Additionally, the systems, apparatus, and methods described, as well as the illustrations of various embodiments, may be combined or integrated with other systems, modules, techniques, or methods without departing from the scope of the invention. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.
Claims (8)
1. A method for calibrating the backlight brightness of a switch panel is characterized by comprising the following steps:
obtaining backlight intensity of a preset position on a switch panel corresponding to a light emitting diode, wherein the backlight intensity is the backlight intensity of the preset position when the working voltage of the light emitting diode is a first preset voltage and when the lighting frequency corresponds to a first standard duty ratio;
judging whether the backlight intensity is in a standard backlight intensity range;
if not, determining a calibration duty ratio according to the backlight intensity, the first standard duty ratio and a light intensity standard median value in the standard backlight intensity range;
replacing the first standard duty cycle with the nominal duty cycle;
when the number of the light emitting diodes is N, N is more than or equal to 2 and is a positive integer, the method further comprises the following steps:
determining a maximum backlight intensity and a minimum backlight intensity from the N backlight intensities obtained from the preset positions corresponding to the N light emitting diodes one to one;
accordingly, determining whether the backlight intensity is within a standard backlight intensity range includes:
judging whether the maximum backlight intensity and the minimum backlight intensity are in a standard backlight intensity range or not;
replacing the backlight intensity with the maximum backlight intensity to determine the nominal duty cycle when both the maximum backlight intensity and the minimum backlight intensity are greater than a light intensity standard upper limit value in the standard backlight intensity range or only the maximum backlight intensity is not within the standard backlight intensity range;
and when the maximum backlight intensity and the minimum backlight intensity are both smaller than the lower limit value of the light intensity standard in the standard backlight intensity range or only the minimum backlight intensity is not in the standard backlight intensity range, replacing the backlight intensity with the minimum backlight intensity to determine the calibration duty ratio.
2. The method of claim 1, wherein determining a nominal duty cycle from the backlight intensity, the first standard duty cycle, and a light intensity standard median value in the standard backlight intensity range comprises:
determining a duty ratio adjustment coefficient according to the backlight intensity and the light intensity standard median value;
and multiplying the duty ratio adjusting coefficient by the first standard duty ratio to obtain the calibration duty ratio.
3. The method of claim 2, further comprising:
obtaining a target backlight intensity of the preset position, wherein the target backlight intensity is the backlight intensity at the preset position when the working voltage of the light emitting diode is a first preset voltage and the lighting frequency corresponds to the calibration duty ratio;
judging whether the target backlight intensity is within the standard backlight intensity range;
and if so, adjusting a second standard duty ratio corresponding to a second preset voltage by using the duty ratio adjustment coefficient.
4. The method of claim 3, further comprising:
judging whether the calibration duty ratio is in a standard duty ratio range or not;
and if so, replacing the first standard duty ratio with the calibration duty ratio.
5. A calibration device for backlight brightness of a switch panel is characterized by comprising:
the backlight control device comprises a first obtaining unit, a second obtaining unit and a control unit, wherein the first obtaining unit is used for obtaining the backlight intensity of a preset position corresponding to a light emitting diode on a switch panel, and the backlight intensity is the backlight intensity of the preset position when the working voltage of the light emitting diode is a first preset voltage and the lighting frequency corresponds to a first standard duty ratio;
a first judging unit for judging whether the backlight intensity is within a standard backlight intensity range;
the calculation unit is used for determining a calibration duty ratio according to the backlight intensity, the first standard duty ratio and a light intensity standard median value in the standard backlight intensity range when the backlight intensity is determined not to be in the standard backlight intensity range;
a replacing unit for replacing the first standard duty cycle with the calibration duty cycle;
when the number of the light emitting diodes is N, N is more than or equal to 2 and is a positive integer, the device further comprises:
a third determining unit configured to determine a maximum backlight intensity and a minimum backlight intensity from N backlight intensities obtained from the preset positions corresponding to the N light emitting diodes one to one;
correspondingly, the first judging unit is specifically configured to:
judging whether the maximum backlight intensity and the minimum backlight intensity are in a standard backlight intensity range or not;
the calculation unit includes:
a first calculating subunit, configured to, when both the maximum backlight intensity and the minimum backlight intensity are greater than a light intensity standard upper limit value in the standard backlight intensity range or only the maximum backlight intensity is not within the standard backlight intensity range, replace the backlight intensity with the maximum backlight intensity to determine the calibration duty cycle;
a second calculating subunit, configured to, when both the maximum backlight intensity and the minimum backlight intensity are smaller than a light intensity standard lower limit value in the standard backlight intensity range or only the minimum backlight intensity is not within the standard backlight intensity range, replace the backlight intensity with the minimum backlight intensity to determine the calibration duty cycle.
6. The apparatus of claim 5, wherein the computing unit comprises:
the first determining unit is used for determining a duty ratio adjusting coefficient according to the backlight intensity and the light intensity standard median;
and the second determining unit is used for multiplying the duty ratio adjusting coefficient by the first standard duty ratio to obtain the calibration duty ratio.
7. The apparatus of claim 6, further comprising:
a second obtaining unit, configured to obtain a target backlight intensity at the preset position, where the target backlight intensity is a backlight intensity at the preset position when a working voltage of the light emitting diode is a first preset voltage and a lighting frequency corresponds to the calibration duty ratio;
a second judging unit, configured to judge whether the target backlight intensity is within the standard backlight intensity range;
and the adjusting unit is used for adjusting a second standard duty ratio corresponding to a second preset voltage by using the duty ratio adjusting coefficient when the target backlight intensity is determined to be in the standard backlight intensity range.
8. The apparatus of claim 7, further comprising:
the third judging unit is used for judging whether the calibration duty ratio is in a standard duty ratio range or not;
when it is determined that the nominal duty cycle is within the standard duty cycle range, performing the step of replacing the first standard duty cycle with the nominal duty cycle.
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| CN114126132B (en) * | 2021-10-29 | 2024-04-30 | 富奥汽车零部件股份有限公司 | Method and device for determining parameters of LED in gear illumination controller |
| CN114255682A (en) * | 2021-12-06 | 2022-03-29 | 四川长虹电器股份有限公司 | Detection device and method for regional dimming function |
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