CN111653244A - Brightness adjusting method - Google Patents
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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
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- 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
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- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The invention provides a brightness adjusting method. The brightness adjusting method is applied to a display module, the display module comprises a display panel and a backlight source, and according to the embodiment of the invention, standard display parameters of the display module are obtained, wherein the standard display parameters comprise standard brightness parameters and standard chromaticity parameters of the display module; measuring display parameters of the display module, wherein the display parameters comprise display brightness parameters and display chromaticity parameters of the display module; calculating a difference value between an electrical parameter of the display module and a standard value of the electrical parameter according to the performance parameter, the display parameter and the standard display parameter of the backlight source of the display module; and generating an adjusting parameter for adjusting the backlight brightness of the display module according to the difference value. Therefore, the performance parameters of the backlight source according to the display module are compared with the standard values to generate the adjusting parameters aiming at the backlight brightness, so that the color cast can be reduced, the brightness uniformity is improved, and the display effect is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a brightness adjusting method.
Background
With the development of display technology, RGB (red, green, blue) three-color miniLED (mini-diode) light-emitting units become a choice as the backlight source of a display module, and the light-emitting efficiency of the light-emitting units with different colors is not completely the same, which may cause the problems of color cast and uneven local brightness, and affect the display effect.
Disclosure of Invention
The embodiment of the invention provides a brightness adjusting method, which aims to solve the problems that color cast and local brightness are not uniform enough to influence a small display effect.
The embodiment of the invention provides a brightness adjusting method, which is applied to a display module, wherein the display module comprises a display panel and a backlight source, and the brightness adjusting method comprises the following steps:
acquiring standard display parameters of a display module, wherein the standard display parameters comprise standard brightness parameters and standard chromaticity parameters of the display module;
measuring display parameters of the display module, wherein the display parameters comprise display brightness parameters and display chromaticity parameters of the display module;
calculating a difference value between an electrical parameter of the display module and a standard value of the electrical parameter according to the performance parameter of the backlight source of the display module, the display parameter and the standard display parameter, wherein the performance parameter comprises a corresponding relation among voltage, current, brightness and chromaticity of the backlight source of the display module;
and generating an adjusting parameter for adjusting the backlight brightness of the display module according to the difference value.
Optionally, after the measuring the display parameter of the display module, the method further includes:
calculating the color difference of the display module relative to a standard value according to the standard display parameters and the display parameters;
and if the color difference is smaller than a preset color difference threshold value, the step of calculating the difference value between the electrical parameter of the display module and the standard value according to the performance parameter of the backlight source of the display module, the display parameter of the display module and the standard display parameter is executed.
Optionally, the calculating a color difference of the display module relative to a standard value according to the standard display parameter and the display parameter includes:
calculating a required tristimulus value according to a standard brightness parameter and a standard chromaticity parameter of the display module;
calculating the required brightness and the reference color difference parameter of the display module according to the required tristimulus values;
calculating an actually measured tristimulus value of the display module according to the display brightness parameter and the display chromaticity parameter of the display module;
calculating actual brightness and actual color difference parameters of the display module according to the actually measured tristimulus values;
and calculating the color difference of the display module according to the required brightness, the reference color difference parameter, the actual brightness and the actual color difference parameter.
Optionally, the backlight source includes a red light emitting unit, a blue light emitting unit, and a green light emitting unit;
the measurement the display parameter of display module assembly includes:
and respectively measuring the chromaticity and the brightness of the display panel when the display panel displays a red picture, a blue picture and a green picture as the display parameters of the display module.
Optionally, after the measuring the display parameter of the display module, the method further includes:
calculating actual driving voltages and actual working currents of the light-emitting units with different colors as electrical parameters of the display module according to the performance parameters of the backlight source of the display module and the display parameters;
and calculating the standard driving voltage and the standard working current of the backlight source as standard electrical parameters according to the performance parameters of the backlight source of the display module and the standard display parameters.
Optionally, the backlight source includes a plurality of primary partitions, and each of the primary partitions is driven by a corresponding driving chip;
calculating actual driving voltages and actual working currents of the light-emitting units with different colors according to the performance parameters of the backlight source of the display module and the display parameters to serve as electrical parameters of the display module, wherein the calculation comprises the following steps:
and respectively calculating the actual driving voltage and the actual working current in each first partition as the electrical parameters of the display module.
Optionally, after the adjusting parameter for adjusting the backlight brightness of the display module is generated according to the difference value, the method further includes:
and adjusting the working current of the corresponding primary partition by using the driving chip corresponding to each primary partition according to the adjusting parameters, so that the working current of each primary partition is equal to the standard working current.
Optionally, each of the primary partitions includes a plurality of secondary partitions;
after the working current of the corresponding primary partition is adjusted by using the driving chip corresponding to each primary partition, the method further comprises the following steps:
and adjusting the driving voltage of each light-emitting unit in each secondary partition in each primary partition through Pulse Width Modulation (PWM).
Optionally, after the adjusting parameter for adjusting the backlight brightness of the display module is generated according to the difference value, the method further includes:
acquiring an input image:
extracting the gray scale value of each pixel point of each frame of image as first display data of the image:
generating a compensation value for each frame of image according to the adjusting parameter as second display data of the image:
and combining the first display data and the second display data as backlight brightness data of the image.
According to the embodiment of the invention, standard display parameters of a display module are obtained, wherein the standard display parameters comprise standard brightness parameters and standard chromaticity parameters of the display module; measuring display parameters of the display module, wherein the display parameters comprise display brightness parameters and display chromaticity parameters of the display module; calculating a difference value between an electrical parameter of the display module and a standard value of the electrical parameter according to the performance parameter of the backlight source of the display module, the display parameter and the standard display parameter, wherein the performance parameter comprises a corresponding relation among voltage, current, brightness and chromaticity of the backlight source of the display module; and generating an adjusting parameter for adjusting the backlight brightness of the display module according to the difference value. Therefore, the performance parameters of the backlight source according to the display module are compared with the standard values to generate the adjusting parameters aiming at the backlight brightness, so that the color cast can be reduced, the brightness uniformity is improved, and the display effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of a brightness adjustment method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a display module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a basic driving unit of a backlight driving circuit of a display module according to an embodiment of the present invention;
FIG. 4A shows a relationship between current and color coordinates of a certain type of LED;
FIG. 4B shows a relationship between voltage and current at two ends of a certain type of LED;
FIG. 4C is a graph of the relationship between current and luminous flux for a certain type of LED;
FIG. 5 is a schematic diagram of a multi-point test in one embodiment of the invention;
fig. 6 is a schematic structural diagram of a display module according to an embodiment of the 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 some, not all, embodiments of the present invention. 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.
The embodiment of the invention provides a brightness adjusting method which is applied to a display module, wherein the display module comprises a display panel and a backlight source.
As shown in fig. 1, in one embodiment, the brightness adjusting method includes the steps of:
step 101: and acquiring standard display parameters of the display module, wherein the standard display parameters comprise standard brightness parameters and standard chromaticity parameters of the display module.
The standard display parameter in this embodiment refers to a required value, which may be specifically set according to a use requirement or a user preference, and in implementation, a luminance value and a chrominance value are provided as design requirements of the display module according to an actual situation.
It should be understood that the brightness parameters generally include typical operating brightness and minimum brightness, and since the minimum brightness is a lower limit of brightness control and has a small influence on brightness control, the standard brightness parameter in the embodiment is set based on the typical brightness, and a certain design margin is added, for example, 5% to 10% margin design, and then the result is taken as the standard brightness parameter. The chromaticity in this embodiment is given in the form of color coordinates.
Specifically, in one embodiment, a 55-inch module is taken as an example, according to the user requirement provided by the user, the typical value of the brightness is required to be 500nit, the minimum brightness is not lower than 400nit, and the white coordinates satisfy the central coordinates (0.33 ).
Aiming at the brightness requirement, the margin is increased by 5% -10%, the value range is 525 nit-550 nit, and the standard brightness parameter is 537.5nit by taking the middle value.
Step 102: and measuring display parameters of the display module, wherein the display parameters comprise display brightness parameters and display chromaticity parameters of the display module.
After the standard display parameters are determined, the display parameters of the display module further need to be obtained. The display parameters of the display module also include a display brightness parameter related to brightness and a display chromaticity parameter related to chromaticity.
It should be understood that, for the display module, the design value of the display parameter is actually equal to the standard display parameter, but there is a difference between the design value and the actual value, that is, the standard display parameter is the design value of the display module, and the measured display parameter can also be understood as the actual display parameter of the display module.
The actual display parameters of the display module can be measured and obtained when the display module is in a display state, specifically, for example, directly measured and obtained by using a color analysis device.
Step 103: and calculating the difference value between the electrical parameter of the display module and the standard value of the electrical parameter according to the performance parameter of the backlight source of the display module, the display parameter and the standard display parameter.
The performance parameters of the backlight source of the display module comprise voltage Vx, current Ix, brightness Lx and chromaticity (x)W，yW) The corresponding relationship between them is denoted as { Vx, Ix, Lx, (x)W，yW)}。
It should be understood that the performance parameters are determined by the hardware performance of the backlight itself, and can be obtained by testing the backlight, or can be obtained from specifications or specifications provided by the manufacturer or manufacturer of the backlight.
According to the performance parameters of the backlight source, the electrical parameters, or actual electrical parameters, of the display module can be calculated by combining the actual display parameters, and the standard values of the electrical parameters of the display module in the standard display state can be calculated by combining the performance parameters of the backlight source and the standard display parameters. Furthermore, by comparing the actual electrical parameter with the electrical parameter standard value, the difference value between the actual electrical parameter and the electrical parameter standard value can be determined.
Step 104: and generating an adjusting parameter for adjusting the backlight brightness of the display module according to the difference value.
After the difference value between the two is determined, adjusting parameters are further generated, the backlight of the display module is adjusted according to the adjusting parameters, so that the difference between the adjusted actual electrical parameters and the standard values of the electrical parameters is reduced, the difference between the actual display effect of the display module and the expected state is reduced, and the display effect is improved.
Therefore, the performance parameters of the backlight source according to the display module are compared with the standard values to generate the adjusting parameters aiming at the backlight brightness, so that the color cast can be reduced, the brightness uniformity is improved, and the display effect is improved.
In some embodiments, after step 102, further comprising:
calculating the color difference of the display module relative to a standard value according to the standard display parameters and the display parameters;
and if the color difference is smaller than a preset color difference threshold value, the step of calculating the difference value between the electrical parameter of the display module and the standard value according to the performance parameter of the backlight source of the display module, the display parameter of the display module and the standard display parameter is executed.
In this embodiment, the color difference between the display module and the standard value is first calculated, and if the color difference is smaller, the display module can be compensated to weaken or offset the existing color difference, so as to meet the use requirement. If the color difference is too large, it is difficult to attenuate the color difference by compensation, and even if compensation and adjustment are performed, it is difficult to compensate for the existing color difference.
In one embodiment, the color difference versus look and feel relationship is defined as follows:
table 1: color difference tolerance standard
| Range color difference (△ E tolerance) | Color difference impression |
| 0-0.25 | Very small or none; ideal match |
| 0.25-0.5 | Micro; acceptable match |
| 1.0-2.0 | Medium; acceptable in certain applications |
| 2.0-4.0 | A difference exists; acceptable in certain applications |
| 4.0 or more | Is very large; are unacceptable in most applications |
As shown in table 1, the range of Δ E from 0 to 0.5 is an acceptable range, and if it exceeds 0.5, the adjustment is required, specifically, for Δ E < 0.5, the adjusted range falls into 0 to 0.5, so as to meet the use requirement.
For the case of Δ >1.5, it is difficult to adjust by compensation due to its significant chromatic aberration, and it is difficult to meet the conventional requirement, and it is only acceptable in some specific application scenarios with low requirement for chromatic aberration, and it is difficult to meet the conventional requirement for use, so it is out of the consideration range of the embodiment.
Under the influence of various conditions, the standard of 0 color difference is difficult to realize in the actual production process, in the embodiment, the standard of 0.25 is used as the judgment of delta E, and the normal distribution central area of the adjusted result is as close to 0.25 as possible, so that a good display effect can be realized.
Optionally, the calculating a color difference of the display module relative to a standard value according to the standard display parameter and the display parameter includes:
calculating a required tristimulus value according to a standard brightness parameter and a standard chromaticity parameter of the display module;
calculating the required brightness and the reference color difference parameter of the display module according to the required tristimulus values;
calculating an actually measured tristimulus value of the display module according to the display brightness parameter and the display chromaticity parameter of the display module;
calculating actual brightness and actual color difference parameters of the display module according to the actually measured tristimulus values;
and calculating the color difference of the display module according to the required brightness, the reference color difference parameter, the actual brightness and the actual color difference parameter.
In the present embodiment, a tristimulus value, which is a degree of stimulation of three primary colors causing a certain color sensation by the human retina, is calculated by the above formula (1), and is expressed by X (amount of stimulation of the primary color of red), Y (amount of stimulation of the primary color of green), and Z (amount of stimulation of the primary color of blue). In the above formula (1), (X, Y, Z) are tristimulus values obtained by calculation, (X, Y) are color coordinates, and L is luminance.
When the standard brightness L is usedSign boardStandard color difference parameter (x)Sign board，ySign board) After substituting the above formula (1), the standard tristimulus value (X) can be calculatedSign board，YSign board，ZSign board)。
Further, the required luminance and the reference color difference parameter are calculated by the above formula (2). In the formula (2), X0，Y0，Z0Is the standard tristimulus value of a standard illuminant in CIE1976, is a fixed value, wherein Y is0＝100，X0＝98.07，Z0118.22. The above standard tristimulus values (X)Sign board，YSign board，ZSign board) In the formula (2), the standard required luminance L can be calculatedNeed toAnd a reference color difference parameter (a)Sign board，bSign board)。
In the calculation, in order to improve the uniformity of the data, the proportion is adjusted (X)Sign board，YSign board，ZSign board) Of such a size that YSign board＝100＝Y0。
Further, the color difference is calculated by the above formula (3), where Δ L represents the brightness of the color, and Δ L ═ LNeed to-LMeasuringIf Δ L is negative, it indicates that the brightness of the display module is lower than the standard requirement.
Δ a represents the positional relationship between red/magenta and green, and Δ a ═ aSign board-aMeasuringIf Δ a is positive, it indicates that the display module is red (or less green) than the standard requirement, and if it is negative, it indicates that the display module is red (or less red) than the standard requirement.
Δ b characterizes the position between yellow and blue, Δ b ═ bSign board-bMeasuringAnd delta b is positive, which indicates that the display module is more red-yellow (or less blue) than the standard requirement, and if the delta b is negative, which indicates that the display module is more red-blue (or less yellow) than the standard requirement.
According to the formula (1) and the above description, the standard values and the measured values of L, a, and b need to be obtained first to determine the chromatic aberration and verify the adjustment effect.
For example, in one embodiment, L is a function of the desired display moduleSign board＝537.5，xSign board＝0.313，ySign boardFormula (1) is substituted with 0.335 to obtain X502.2, Y537.5, and Z564.8. Proportionally mixing Y withSign boardSince K is 537.5/100 is 5.375 when converted to 100, X, Y, Z is divided by 5.375, and the conversion is completed (X isSign board，YSign board，ZSign board) (93.43, 100, 105.08). Further, substituting into formula (2) to obtain (L)Need to，aSign board，bSign board)＝(100，-10，8)。
For a display module, mark sample 1, measure L520 through the color analyzer, x 0.323, yThe calculation is performed using the formula (1) and the formula (2) in the above manner, with X being 510.5, Y being L being 520, and Z being 550, to obtain (L) 0.329Side 1，aSide 1，bSide 1)＝(100，0.15，7)。
Further, the color difference Δ E1 calculated by equation (3) is 10.2, so that the color difference of the display module is too large to meet the use requirement by compensation.
Another display module is denoted as sample 2, and is calculated by using formula (1) and formula (2) in the manner described above, where L is 535, X is 0.310, Y is 0.333, X is 495.41, Y is L535, and Z is 564.9, measured by a color analyzer, to obtain (L)Side 2，aSide 2，bSide 2)＝(100，-9.5，7.4)。
If the color difference Δ E2 calculated by the formula (3) is 0.78 and is smaller than the set value 1.5, and the usage requirement can be satisfied by adjusting the color difference, the step 103 is further executed to compensate the display module.
Thus, by determining X, Y, Z of the white picture. Meanwhile, in the process of designing the module, the rated current of the LED and the color block of the RGB three-color LED are selected, after a module sample is manufactured, a color analyzer is used for measuring the module to be tested due to error fluctuation of an actual product to obtain a required tristimulus value, the delta E value is further calculated according to a color difference formula, and whether the display module product meets the requirement of further adjustment is judged.
Optionally, the backlight includes a red light emitting unit, a blue light emitting unit, and a green light emitting unit, wherein the light emitting unit may be a mini LED (mini diode). The step 102 includes:
and respectively measuring the chromaticity and the brightness of the display panel when the display panel displays a red picture, a blue picture and a green picture as the display parameters of the display module.
In step 102, the luminance of the module and the color coordinates of the white frame are determined, and further, the color coordinates and luminance of the RGB monochrome frame are respectively tested. By measuring the light-emitting units of each color of the display panel, the light-emitting units of each color are compensated in a targeted manner, which is beneficial to further improving the display effect.
Taking the above sample 2 as an example, as shown in fig. 2, the display module includes a plurality of primary partitions 201, and each of the primary partitions 201 includes a plurality of secondary partitions 202.
For example, the display module is a 55-inch display module, the resolution is 3840 × 2160, and the display module specifically includes 144 primary partitions, each of which includes 57600 pixels, and more specifically, 57600 × 3 × 172800 RGB sub-pixels. Each primary partition respectively comprises R, G, B light-emitting units 144, that is, each primary partition comprises 432 light-emitting units in total; at this time, each group of light sources corresponds to 400 pixels.
Each primary partition may be further divided into 16 × 9-144 secondary partitions, each containing 20 × 20-400 pixels. That is, each primary partition ranges from 1/144, about 0.69% of the display area, and each secondary partition ranges from (1/144)/144, about 0.48 parts per million of the display area.
Obviously, in practical implementation, the division of the primary partition and the secondary partition of the display module is not limited to this.
As shown in fig. 2, the partition positions of each primary partition 201 are encoded according to the horizontal and vertical directions, i.e., a1 and a2 … Am in the vertical direction and B1 and B2 … Bn in the horizontal direction. Thus, each unit partition is numbered A1B1, A1B2, …, A2B1, … AmBn, respectively, and each primary partition 201 includes a plurality of secondary partitions 202.
Referring to fig. 3, fig. 3 is a schematic diagram of a basic driving unit of a backlight driving circuit of a backlight source in a display module according to the present invention, in which one driving chip (LED Driver)301 is used to drive in each primary partition, and the driving chips are respectively driven in the horizontal and vertical directions, the switching element 302 is used to control the power input of each row (RGBminiLED anode) and the MUX 303 is used to control the power on/off of each column (RGBminiLED cathode), so as to implement matrix switch control, and in the diagram, the colors of the light emitting units 304 with different filling effects are different.
In this embodiment, a test of the red light emitting unit is described as an example. After testing, the test results of each primary partition are shown in table 2.
Table 2: test result of primary partition red light-emitting unit of certain display module
| (150.8，0.691，0.310) | 。。。。。。 | (150.7，0.689，0.311) |
| 。。。。。。 | 。。。。。。 | 。。。。。。 |
| 。。。。。。 | 。。。。。。 | 。。。。。。 |
| (150.0，0.690，0.315) | 。。。。。。 | (151.2，0.685，0.311) |
Each of the above data is the test result (L, x, y) of the red monochromatic picture of each partition.
Optionally, after the measuring the display parameter of the display module, the method further includes:
calculating actual driving voltages and actual working currents of the light-emitting units with different colors as electrical parameters of the display module according to the performance parameters of the backlight source of the display module and the display parameters;
and calculating the standard driving voltage and the standard working current of the backlight source as standard electrical parameters according to the performance parameters of the backlight source of the display module and the standard display parameters.
For the backlight, its performance parameters { Vx, Ix, Lx, (x)W，yW) The correspondence relationship between the current and the chromaticity, the correspondence relationship between the current and the voltage, and the correspondence relationship between the current and the luminous flux are known and fixed, and the specific electrical parameters of the display module under different conditions can be determined according to the performance parameters.
As shown in fig. 4A to 4C, fig. 4A shows a corresponding relationship between current and color coordinates of a certain type of LED, a current value in milliamperes (mA) can be determined according to a point on an image, and then corresponding color coordinates x and y can be determined according to an abscissa and an ordinate, respectively. FIG. 4B is a graph showing the relationship between voltage and current at two ends of a certain type of LED, wherein the abscissa is voltage in volts (V) and the ordinate is circuit in mA; fig. 4C shows the relationship between current and relative luminous flux for a certain type of LED, where the abscissa is current in mA and the ordinate is relative luminous flux, which refers to the ratio of the actual luminous flux to the maximum luminous flux in percent (%).
According to the performance parameters of the light-emitting unit, the electrical parameters can be calculated and obtained by combining the measured display parameters. According to the performance parameters of the light-emitting unit, the standard electrical parameters can be obtained through calculation by combining the set standard display parameters.
Because the chromaticity dispersion condition of the backlight source of the three-color light-emitting unit is higher than that of the backlight source of the white light-emitting unit, the distribution conditions of the brightness and the chromaticity at different positions are obtained through multi-point measurement in the data acquisition process, and the average value of the distribution conditions is obtained, so that the accuracy of the measurement result is improved.
As shown in fig. 5, in the present embodiment, 9 test points 501 are selected, and the distribution of the test points 501 should be relatively uniform, so as to improve the accuracy of the measurement result.
Optionally, the backlight source includes a plurality of primary partitions, and each of the primary partitions is driven by a corresponding driving chip;
calculating actual driving voltages and actual working currents of the light-emitting units with different colors according to the performance parameters of the backlight source of the display module and the display parameters to serve as electrical parameters of the display module, wherein the calculation comprises the following steps:
and respectively calculating the actual driving voltage and the actual working current in each first partition as the electrical parameters of the display module.
Taking the red color of a certain level of partition but with the result of the frame test being (150.7, 0.689, 0.311) as an example, the voltage and current of the corresponding red light-emitting unit are respectively 2.88V and 20.2mA, the standard display parameters of the red monochrome frame are (150.8, 0.692, 0.310), and the standard electrical parameters thereof are respectively 2.92V and 20.5 mA.
After the electrical parameters of the display module and the corresponding standard electrical parameters are determined, the difference value is calculated, and Δ V ═ 0.04 and Δ I ═ 0.3mA which need to be adjusted can be obtained.
Optionally, after the adjusting parameter for adjusting the backlight brightness of the display module is generated according to the difference value, the method further includes:
and adjusting the working current of the corresponding primary partition by using the driving chip corresponding to each primary partition according to the adjusting parameters, so that the working current of each primary partition is equal to the standard working current.
In this embodiment, each primary partition is driven by a separate driving chip, so that the change of the current can be adjusted, the current in the adjusted partitions is uniformly adjusted to a corresponding value, and the voltage changes along with the adjustment of the current due to the property limitation of the light emitting unit, thereby realizing the compensation of each primary partition.
Optionally, each of the primary partitions includes a plurality of secondary partitions;
after the working current of the corresponding primary partition is adjusted by using the driving chip corresponding to each primary partition, the method further comprises the following steps:
and adjusting the driving voltage of each light-emitting unit in each secondary partition in each primary partition through Pulse Width Modulation (PWM).
Since the individual differences of the light-emitting units may occur, the adjusted luminance and color coordinates may not be completely consistent, and the secondary partitions may need to be adjusted again, and are controlled separately by using a switching element, such as a MOS transistor, and the voltage may be further adjusted by PWM (Pulse width modulation), and the light-emitting units in each secondary partition may be controlled to be switched, so that the uniformity of the chromaticity may be further adjusted, and the color difference may be reduced.
Since the adjusted color difference for the primary partition is already reduced, in the adjusting process for the secondary partition, only fine adjustment is performed, for example, in one embodiment, the PWM difference of different light-emitting units is controlled to be ± 0.2% (1024 steps, adjustment of average duty ratio ± 2 is performed), so as to reduce the flicker of the light-emitting units caused by too large PWM adjustment amplitude.
Taking the sample 2 as an example, the current difference Δ ImA between the red LEDs in a certain level of partition is adjusted to the required current by the LED Driver, and at this time, when the red LEDs are subjected to visual inspection and repeated measurement, it is found that some points are still not uniform enough, and then the LED light sources corresponding to the level of partition are subjected to PWM fine adjustment.
Optionally, after the adjusting parameter for adjusting the backlight brightness of the display module is generated according to the difference value, the method further includes:
acquiring an input image:
extracting the gray scale value of each pixel point of each frame of image as first display data of the image:
generating a compensation value for each frame of image according to the adjusting parameter as second display data of the image:
and combining the first display data and the second display data as backlight brightness data of the image.
As shown in fig. 6, an original image inputted from the outside first enters an FPGA (Field Programmable gate array) image processing unit 601, a gray level value corresponding to each pixel point of each frame image is extracted, and data is stored in units of frames.
Because the main function of the module is the correction function of chromatic aberration, corresponding compensation information is respectively added according to the driving partition condition of the mini LED driver and is also stored by taking a frame as a unit.
For the chrominance compensation of each frame, the two sets of data are combined in the FPGA to form adjusted backlight luminance information, which is sent to the MCU (micro control unit) 602. The MCU602 receives the related information and sends the related information to a light emitting unit driver (leddr) 603, so as to complete light emitting control on the light emitting units 604 according to the information, wherein the MUX605 is used to control the power on/off of the cathode of each row of the light emitting units 604.
And the adjusted display module can be further detected, if the detection result meets the requirement, the same product can be adjusted according to the result, and if the color difference is still large after adjustment, the steps can be repeated to continue adjustment until the color difference requirement is met.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A brightness adjusting method is applied to a display module, the display module comprises a display panel and a backlight source, and the brightness adjusting method comprises the following steps:
acquiring standard display parameters of a display module, wherein the standard display parameters comprise standard brightness parameters and standard chromaticity parameters of the display module;
measuring display parameters of the display module, wherein the display parameters comprise display brightness parameters and display chromaticity parameters of the display module;
calculating a difference value between an electrical parameter of the display module and a standard value of the electrical parameter according to the performance parameter of the backlight source of the display module, the display parameter and the standard display parameter, wherein the performance parameter comprises a corresponding relation among voltage, current, brightness and chromaticity of the backlight source of the display module;
and generating an adjusting parameter for adjusting the backlight brightness of the display module according to the difference value.
2. The method for adjusting brightness according to claim 1, wherein after measuring the display parameters of the display module, the method further comprises:
calculating the color difference of the display module relative to a standard value according to the standard display parameters and the display parameters;
and if the color difference is smaller than a preset color difference threshold value, the step of calculating the difference value between the electrical parameter of the display module and the standard value according to the performance parameter of the backlight source of the display module, the display parameter of the display module and the standard display parameter is executed.
3. The method of claim 2, wherein calculating the color difference of the display module from a standard value according to the standard display parameter and the display parameter comprises:
calculating a required tristimulus value according to a standard brightness parameter and a standard chromaticity parameter of the display module;
calculating the required brightness and the reference color difference parameter of the display module according to the required tristimulus values;
calculating an actually measured tristimulus value of the display module according to the display brightness parameter and the display chromaticity parameter of the display module;
calculating actual brightness and actual color difference parameters of the display module according to the actually measured tristimulus values;
and calculating the color difference of the display module according to the required brightness, the reference color difference parameter, the actual brightness and the actual color difference parameter.
4. The luminance adjustment method as claimed in claim 1, wherein the backlight includes a red light emitting unit, a blue light emitting unit, and a green light emitting unit;
the measurement the display parameter of display module assembly includes:
and respectively measuring the chromaticity and the brightness of the display panel when the display panel displays a red picture, a blue picture and a green picture as the display parameters of the display module.
5. The method for adjusting brightness according to claim 4, wherein after measuring the display parameters of the display module, the method further comprises:
calculating actual driving voltages and actual working currents of the light-emitting units with different colors as electrical parameters of the display module according to the performance parameters of the backlight source of the display module and the display parameters;
and calculating the standard driving voltage and the standard working current of the backlight source as standard electrical parameters according to the performance parameters of the backlight source of the display module and the standard display parameters.
6. The luminance adjusting method as claimed in claim 5, wherein the backlight source includes a plurality of primary sections, each of the primary sections being driven by a corresponding driving chip;
calculating actual driving voltages and actual working currents of the light-emitting units with different colors according to the performance parameters of the backlight source of the display module and the display parameters to serve as electrical parameters of the display module, wherein the calculation comprises the following steps:
and respectively calculating the actual driving voltage and the actual working current in each first partition as the electrical parameters of the display module.
7. The method according to claim 6, wherein after generating the adjustment parameter for adjusting the backlight brightness of the display module according to the difference value, the method further comprises:
and adjusting the working current of the corresponding primary partition by using the driving chip corresponding to each primary partition according to the adjusting parameters, so that the working current of each primary partition is equal to the standard working current.
8. The luminance adjustment method as claimed in claim 7, wherein each of the primary partitions includes a plurality of secondary partitions;
after the working current of the corresponding primary partition is adjusted by using the driving chip corresponding to each primary partition, the method further comprises the following steps:
and adjusting the driving voltage of each light-emitting unit in each secondary partition in each primary partition through Pulse Width Modulation (PWM).
9. The method according to claim 1, wherein after generating the adjustment parameter for adjusting the backlight brightness of the display module according to the difference value, the method further comprises:
acquiring an input image:
extracting the gray scale value of each pixel point of each frame of image as first display data of the image:
generating a compensation value for each frame of image according to the adjusting parameter as second display data of the image:
and combining the first display data and the second display data as backlight brightness data of the image.
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