CN105512461A - Calculation method, and system of backlight mura value and detection device - Google Patents
Calculation method, and system of backlight mura value and detection device Download PDFInfo
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Abstract
The invention provides a calculation method and system of backlight mura value and a detection device. The method comprises following steps: taking a relative luminance curve of a display panel and a luminance matrix and removing direct current component of the relative luminance curve in order to obtain mura component of the relative luminance curve; obtaining frequency multiplication based on measurement distance and distance between a backlight and a lamp core; performing DFT conversion of the luminance matrix in order to obtain an F(fx); adding real parts and imaginary parts of the F(fx) matrix in order to obtain an FP (fx); and performing CS calculation of a frequency doubling matrix f in order to obtain a CSF (f) and obtaining the mura value based on the matrix FP (fx), the CSF (f) and the empirical constant.The technical scheme provided by the invention has advantages of high efficiency and low cost.
Description
Technical Field
The invention relates to the field of display, in particular to a method and a system for calculating a mura value of a backlight source and a detection device.
Background
Liquid crystal displays (hereinafter, referred to as "panels") are also known as liquid crystal displays (LCDs "), which are currently used electronic display devices. In recent years, market share of CCFL (cold cathode fluorescent lamp, chinese), direct type LED backlight and side-emitting type LED backlight is increasing. For cost savings and visual aesthetics, mura may occur by reducing the thickness of the diffuser plate (diffuser plate) or reducing the thickness of the optical cavity.
In the scheme for realizing the prior art, the following technical problems are found in the prior art:
in the prior art, manufacturers typically train personnel and then evaluate mura values (some manufacturers also referred to as mura ratings or mura severity) by human observation; the method is low in efficiency, subjectivity of artificial evaluation is too high, evaluation standards are different, mura values belong to important parameters of the display panel, and inaccurate mura value evaluation easily influences the quality of the display panel.
Disclosure of Invention
The backlight source mura value calculating method is used for carrying out quantitative automatic calculation on the mura value, and manual evaluation of the mura value is not needed, so that the method has the advantages of high efficiency, unified evaluation standard and strong objectivity.
In a first aspect, a method for calculating a mura value of a backlight source is provided, the method comprising the steps of:
acquiring a relative brightness relative curve of a display panel and a brightness matrix of the display panel, and removing a direct current component of the relative brightness curve to obtain a muramuramura component of the relative brightness curve;
calculating to obtain a frequency doubling f according to the distance between the measured distance and the backlight lamp wick of the display paneln；
DFT conversion is carried out on the luminance moment to obtain F (fx);
F(fx)＝[Lx1,Lx2...........Lxn](ii) a Wherein,
lx1 is 0/n frequency multiplication component, Lx2 is 1/n frequency multiplication component, Lxn is (n-1)/n frequency multiplication component, and n is the number of sampling points of luminence moment ;
f (F)x) The real and imaginary parts in the matrix are added to obtain a matrix FP(fx)；
FP(fx)＝|FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realIs F (F)x) Real part of matrix, FP(fx)imagIs F (F)x) A matrix imaginary part;
according to a matrix FP(fx) and empirical constants were calculated to obtain mura values.
In combination with the method for calculating the mura value of the backlight source provided by the first aspect, in a first preferred embodiment of the first aspect, the matrix F is used to calculate the mura value of the backlight sourceP(fx) and empirical constants to obtain the mura values specifically, including:
f is to beP(fx) substituting the first preset formula to calculate a mura value; the first predetermined formula is:
Q＝ΣFp(fx)
JND＝Q/C；
where C is an empirical constant and JND is a mura value.
In combination with the method for calculating the mura value of the backlight source provided by the first aspect, in a second preferred embodiment of the first aspect, the matrix F is used to calculate the mura value of the backlight sourceP(fx) and empirical constants to obtain the mura values specifically, including:
performing CS calculation on the frequency multiplication matrix F to obtain CSF (F), and calculating FP(fx) and CSF (f) are substituted into a second preset formula to calculate a mura value; the second preset formula is specifically as follows:
Q＝ΣFp(fx)·CSF(f)
wherein, CSF (f) 2.6 (0.0192+0.114 f) exp (0.114 f) 1.1)
JND＝Q/C；
Wherein C is an empirical constant, f is a frequency multiplication matrix, and JND is a mura value;
f＝[f1,f2...........fn]
wherein f isnDenotes a frequency multiplication, f1Is 0/n-frequency multiplication fn，f2Is 1/n-frequency multiplication fn。
With reference to the method for calculating a mura value of a backlight source provided by the first aspect, the first preferred embodiment of the first aspect, or the second preferred embodiment of the first aspect, in a third preferred embodiment of the first aspect, the method further includes:
and judging whether the display panel is qualified or not according to the mura value, and if the mura value is larger than a threshold value, judging that the display panel is unqualified.
In a second aspect, a system for calculating a backlight mura value is provided, the system comprising:
the sampling unit is used for acquiring a relative brightness relative curve of the display panel and a brightness matrix of the display panel, and removing a direct current component of the relative brightness curve to obtain a muramuramura component of the relative brightness curve;
a frequency doubling unit for calculating a frequency doubling f according to the distance between the measured distance and the backlight lamp wick of the display paneln；
The conversion unit is used for performing DFT conversion on the luminance moment to obtain F (fx);
F(fx)＝[Lx1,Lx2...........Lxn](ii) a Wherein,
lx1 is 0/n frequency multiplication component, Lx2 is 1/n frequency multiplication component, Lxn is (n-1)/n frequency multiplication component, and n is the number of sampling points of luminence moment ;
a superimposing unit for superimposing F (F)x) The real and imaginary parts in the matrix are added to obtain a matrix FP(fx)；
FP(fx)＝|FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realIs F (F)x) Real part of matrix, FP(fx)imagIs F (F)x) A matrix imaginary part;
a computing unit for further processing according to the matrix FP(fx) and empirical constants were calculated to obtain mura values.
With reference to the system for calculating a mura value of a backlight source provided by the second aspect, in a first preferred embodiment of the second aspect, the calculating unit is specifically configured to:
f is to beP(fx) substituting the first preset formula to calculate a mura value; the first predetermined formula is:
Q＝ΣFp(fx)
JND＝Q/C；
where C is an empirical constant and JND is a mura value.
With reference to the system for calculating a mura value of a backlight source provided by the second aspect, in a second preferred embodiment of the second aspect, the calculating unit is specifically configured to:
performing CS calculation on the frequency multiplication matrix F to obtain CSF (F), and calculating FP(fx) and CSF (f) are substituted into a second preset formula to calculate a mura value; the second preset formula is specifically as follows:
Q＝ΣFp(fx)·CSF(f)
wherein, CSF (f) 2.6 (0.0192+0.114 f) exp (0.114 f) 1.1)
JND＝Q/C；
Wherein C is an empirical constant, f is a frequency multiplication matrix, and JND is a mura value;
f＝[f1,f2...........fn]
wherein f isnDenotes a frequency multiplication, f1Is 0/n-frequency multiplication fn，f2Is 1/n-frequency multiplication fn。
In combination with the system for calculating a mura value of a backlight source provided by the second aspect, the first preferred embodiment of the second aspect, or the second preferred embodiment of the second aspect, in a third preferred embodiment of the second aspect, the system further includes:
and the judging unit is used for judging whether the display panel is qualified or not according to the mura value, and if the mura value is larger than a threshold value, judging that the display panel is unqualified.
In a third aspect, a detection apparatus is provided, where the detection apparatus includes the system for calculating the mura value of the backlight source provided in the second aspect, the first preferred version of the third aspect, the second preferred version of the third aspect, or the third preferred version of the third aspect.
According to the backlight mura value calculation method, the backlight mura value calculation system and the display panel provided by the embodiments, the mura value is calculated in a quantification mode, the relative brightness curve and the brightness matrix are calculated to obtain the mura value, the method is an automatic calculation mode, manual participation is not needed, so that the method has the advantages of high efficiency and high automation degree, the speed and the efficiency of detecting the display panel are improved, the method is an objective calculation mode, manual participation is not needed, the cost is low, and actual calculation tests show that the calculated mura value is almost consistent with the manually (experientially) judged mura value, so the method also has the advantage of accurate mura value calculation.
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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, 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 the drawings without creative efforts.
FIG. 1 is a schematic view of a wick arrangement of a direct type LED backlight in the prior art;
FIG. 2 is a diagram illustrating the brightness distribution of a display panel in the X direction according to the prior art;
FIG. 3 is a flowchart illustrating a method for calculating a mura value of a backlight source according to a first preferred embodiment of the present invention;
FIG. 4 is a graph illustrating relative luminance curves according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a relative luminance curve of a display panel according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for calculating a mura value of a backlight source according to a second preferred embodiment of the present invention;
FIG. 7 is a flowchart illustrating a method for calculating a mura value of a backlight source according to a third preferred embodiment of the present invention;
FIG. 8 is a structural diagram of a system for calculating a mura value of a backlight source according to a fourth preferred embodiment of the present invention;
fig. 9 is a schematic structural diagram of a detection apparatus 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. 3, fig. 3 shows a method for calculating a mura value of a backlight according to a first preferred embodiment of the present invention, which may be performed by a detection device, including but not limited to: as shown in fig. 3, the method includes the following steps:
step S301, acquiring a relative brightness curve of the display panel and a brightness matrix of the display panel, and removing a direct current component of the relative brightness curve to obtain a mura component of the relative brightness curve;
the manner of acquiring the relative luminance curve of the display panel in the step S301 may be various, and the first preferred embodiment of the present invention is not limited to the manner of acquiring the relative luminance curve, for example, in an embodiment of the first preferred embodiment of the present invention, the relative luminance curve may be acquired by a CCD (Charge-coupled device), but in another embodiment of the first preferred embodiment of the present invention, the relative luminance curve may also be acquired by a camera of the same industry.
There are various ways to acquire the luminance matrix of the display panel in step S301, and the first preferred embodiment of the present invention does not limit the specific manner of acquiring the luminance matrix.
The method for obtaining the mura component of the relative luminance curve by removing the dc component of the relative luminance curve in step S301 may be various, for example, in an embodiment of the first preferred embodiment of the present invention, the relative luminance curve may be shifted downward to remove the dc component, as shown in fig. 4, although in a specific implementation, other manners may be adopted, for example, in another embodiment of the first preferred embodiment of the present invention, the value of the dc component of the relative luminance curve may be directly subtracted. Of course, in another embodiment of the first preferred embodiment of the present invention, the dc component may be removed in another manner, and the manner of removing the dc component in the first preferred embodiment of the present invention is not limited.
Step S302, calculating a frequency multiplication f according to the distance between the measured distance and a backlight (English) lamp wick of the display paneln；
The distance measured in step S302 may specifically be a distance between the detection device and the display panel, referring to fig. 5, fig. 5 is a schematic diagram of obtaining the relative brightness of the display panel according to the first preferred embodiment of the present invention, where d2 is the measured distance, and d1 may be a distance between backlight wicks (the wicks are generally adjacent bright wicks and dark wicks); f abovenNamely 1/theta (cycle/hierarchy); the calculation method of θ can be calculated by using the prior art scheme, for example, in an embodiment of the first preferred embodiment of the present invention, the θ can be calculated by using an inverse trigonometric function; of course, in other embodiments of the first preferred embodiment of the present invention, other ways to calculate θ can be used. The first preferred embodiment of the present invention is not limited to the above-described method for calculating θ. The cycle/degree may be a unit of frequency multiplication.
Step S303, performing DFT (discrete Fourier transform) conversion on the luminance moment to obtain F (fx);
F(fx)＝[Lx1,Lx2...........Lxn](ii) a Wherein,
lx1 is a 0/n frequency multiplication component, Lx2 is a 1/n frequency multiplication component, Lxn is an (n-1)/n frequency multiplication component, i.e., a frequency multiplication component, which is a frequency multiplication component for a frequency multiplication fnObtaining a frequency multiplication component after DFT conversion; n may be the number of sample points of the luminance moment .
Step S304, F (F)x) The real and imaginary parts in the matrix are added to obtain a matrix FP(fx)；
FP(fx)＝|FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realCan be F (F)x) Real part of matrix, FP(fx)imagCan be F (F)x) The imaginary part of the matrix.
In the above step S304, | FP(fx)realThe | representation matrix FP(fx) absolute value of real part, | F in the above step S304P(fx)imagThe | representation matrix FP(fx) absolute value of imaginary part.
Step S305, according to the matrix FP(fx) and empirical constants were calculated to obtain mura values (i.e., JND values).
The above step S305 is based on the matrix FP(fx) and empirical constants may be calculated for mura values in a variety of ways, and the implementation can be found in the embodiment of the second preferred embodiment of the present invention and the embodiment of the third preferred embodiment of the present invention.
Referring to fig. 1 and 2, a detailed description will be given of technical effects achieved by the technical solution of the first preferred embodiment of the present invention, where fig. 1 is a schematic view of a wick arrangement of a direct-type LED backlight, fig. 2 is a view of a luminance distribution of a display panel in an X direction, and when the luminance distribution is close to a position of a wick, the luminance of the position is higher to form a bright area, and the luminance of the position is lower to form a dark area because the position is far from the wick between two wicks, so that mura of excessive brightness and darkness is generated on the entire display panel. The method provided by the first preferred embodiment of the present invention calculates the mura value in a quantitative manner, and calculates the relative luminance curve and the luminance matrix to obtain the mura value, because the method is an automatic calculation manner, the method does not need manual participation, so the method has the advantages of high efficiency and high automation degree, and the method also improves the speed and efficiency of detecting the display panel, and the method is an objective calculation manner, and does not need human participation, so the cost is low, and practical calculation tests show that the calculated mura value is almost consistent with the manually (empirically) determined mura value, so the method also has the advantage of accurate mura value calculation.
And S306, judging whether the display panel is qualified or not according to the mura value.
The implementation manner of the above step may specifically be that the mura value is compared with a threshold, and if the mura value is greater than the threshold, the display panel is determined to be unqualified. It should be noted that, the determination of the qualification of the display panel needs to be implemented by detecting various parameters, and the mura value lower than the threshold is only one detection parameter.
According to the technical scheme, the efficiency of detecting the display panel can be improved, the automation degree can be improved, the labor cost can be effectively reduced, and the error rate can be reduced.
Referring to fig. 6, fig. 6 shows a method for calculating a mura value of a backlight according to a second preferred embodiment of the present invention, which can be implemented by a detection device, including but not limited to: as shown in fig. 6, the method includes the following steps:
step S601, acquiring a relative brightness (English) curve of the display panel and a brightness (English) matrix of the display panel, and removing a direct current component of the relative brightness curve to obtain a mura component of the relative brightness curve;
the manner of acquiring the relative luminance curve of the display panel in the step S601 may be various, and the second preferred embodiment of the present invention is not limited to the manner of acquiring the relative luminance curve, for example, in an embodiment of the second preferred embodiment of the present invention, the relative luminance curve may be acquired by a CCD (Charge-coupled device), and of course, in another embodiment of the second preferred embodiment of the present invention, the relative luminance curve may also be acquired by a camera of the same industry.
There are various ways to acquire the luminance matrix of the display panel in step S601, and the second preferred embodiment of the present invention does not limit the specific manner of acquiring the luminance matrix.
The method for removing the dc component of the relative luminance curve in step S601 to obtain the mura component of the relative luminance curve may be various, for example, in an embodiment of the second preferred embodiment of the present invention, the relative luminance curve may be shifted downward to remove the dc component, as shown in fig. 4, although in a specific implementation, other manners may be adopted, for example, in another embodiment of the second preferred embodiment of the present invention, the value of the dc component of the relative luminance curve may be directly subtracted. Of course, in another embodiment of the second preferred embodiment of the present invention, the dc component may be removed in another manner, and the second preferred embodiment of the present invention is not limited to the manner of removing the dc component.
Step S602, calculating a frequency multiplication f according to the distance between the measured distance and a backlight (English) lamp wick of the display paneln；
The distance measured in step S602 may be, specifically, the distance between the detection device and the display panel, referring to fig. 5, fig. 5 is a method for obtaining the relative brightness of the display panel according to the second preferred embodiment of the present invention, wherein d2 is the measured distance,d1 can be the distance between backlight wicks (which are typically adjacent light and dark wicks); f abovenNamely 1/theta (cycle/hierarchy); the calculation method of θ can be calculated by using the prior art scheme, for example, in an embodiment of the second preferred embodiment of the present invention, the θ can be calculated by using an inverse trigonometric function; of course, in other embodiments of the second preferred embodiment of the present invention, other ways to calculate θ can be used. The second preferred embodiment of the present invention is not limited to the above-described method for calculating θ. The cycle/degree may be a unit of frequency multiplication.
Step S603, DFT (discrete Fourier transform) conversion is carried out on the luminance moment to obtain F (fx);
F(fx)＝[Lx1,Lx2...........Lxn](ii) a Wherein,
lx1 is a 0/n frequency multiplication component, Lx2 is a 1/n frequency multiplication component, Lxn is an (n-1)/n frequency multiplication component, i.e., a frequency multiplication component, which is a frequency multiplication component for a frequency multiplication fnObtaining a frequency multiplication component after DFT conversion; n may be the number of sample points of the luminance moment .
Step S604, F (F)x) The real and imaginary parts in the matrix are added to obtain a matrix FP(fx)；
FP(fx)＝|FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realCan be F (F)x) Real part of matrix, FP(fx)imagCan be F (F)x) The imaginary part of the matrix.
In the above step S604, | FP(fx)realThe | representation matrix FPAbsolute value of real part of (fx) | F in the above step S604P(fx)imagThe | representation matrix FP(fx) absolute value of imaginary part.
Step S605, FP(fx) substitution into a first predetermined formulaObtaining a mura value; the first preset formula may specifically be:
Q＝ΣFp(fx)
JND＝Q/C；
wherein C is an empirical constant.
The value of the constant C in the step S605 can be set by the manufacturer, for example, in one embodiment of the second preferred embodiment of the present invention, C can be set to 2000, but of course, in another embodiment of the second preferred embodiment of the present invention, C can be set to 2100 or other values, where Σ F in the above formulap(fx) may represent the matrix FP(fx) the sum of all real absolute values and all imaginary absolute values.
In the above step S605, JDN represents mura value, and its specific calculation manner is, if Q is 2000, and C is 2000, JND is 2000/2000 is 1; if Q is calculated to 3000, JND is 3000/2000 is 1.5.
Referring to fig. 1 and 2, a detailed description will be given of technical effects achieved by the technical solution of the second preferred embodiment of the present invention, where fig. 1 is a schematic view of a wick arrangement of a direct-type LED backlight, fig. 2 is a view of a luminance distribution of a display panel in an X direction, and when the luminance distribution is close to a position of a wick, the luminance of the position is higher to form a bright area, and the luminance of the position is lower to form a dark area because the position is far from the wick between two wicks, so that mura of excessive brightness and darkness is generated on the entire display panel. The method provided by the second preferred embodiment of the present invention calculates the mura value by quantization, and processes the relative luminance curve and the luminance matrix to obtain the matrix FP(fx), this matrix FPThe real part and the imaginary part of (fx) can represent mura values, and the mura values can be calculated by adding all the real parts and the imaginary parts and dividing the sum by an empirical constantThe speed and the efficiency of detecting the display panel are improved, the mode is an objective calculation mode, and human participation is not needed, so the cost is low, and the actual calculation test shows that the calculated mura value is almost consistent with the manually (experientially) judged mura value, so the method also has the advantage of accurate mura value calculation.
And step S606, judging whether the display panel is qualified according to the mura value.
The implementation manner of the above step may specifically be that the mura value is compared with a threshold, and if the mura value is greater than the threshold, the display panel is determined to be unqualified. It should be noted that, the determination of the qualification of the display panel needs to be implemented by detecting various parameters, and the mura value lower than the threshold is only one detection parameter.
According to the technical scheme, the efficiency of detecting the display panel can be improved, the automation degree can be improved, the labor cost can be effectively reduced, and the error rate can be reduced.
Referring to fig. 7, fig. 7 shows a method for calculating a mura value of a backlight according to a third preferred embodiment of the present invention, which can be implemented by a detection device, including but not limited to: as shown in fig. 7, the method includes the following steps:
step S701, acquiring a relative brightness (English) curve of the display panel and a brightness (English) matrix of the display panel, and removing a direct current component of the relative brightness curve to obtain a mura component of the relative brightness curve;
the manner of acquiring the relative luminance curve of the display panel in the step S701 may be various, and the third preferred embodiment of the present invention is not limited to the manner of acquiring the relative luminance curve, for example, in an embodiment of the third preferred embodiment of the present invention, the relative luminance curve may be acquired by a CCD (Charge-coupled device), and of course, in another embodiment of the third preferred embodiment of the present invention, the relative luminance curve may also be acquired by a camera of the same industry.
There are various ways to acquire the luminance matrix of the display panel in step S701, and the third preferred embodiment of the present invention does not limit the specific manner of acquiring the luminance matrix.
The method for obtaining the mura component of the relative luminance curve by removing the dc component of the relative luminance curve in step S701 may be various, for example, in an embodiment of the third preferred embodiment of the present invention, the relative luminance curve may be shifted downward to remove the dc component, as shown in fig. 4, although in a specific implementation, other manners may be adopted, for example, in another embodiment of the third preferred embodiment of the present invention, the value of the dc component of the relative luminance curve may be directly subtracted. Of course, in another embodiment of the third preferred embodiment of the present invention, the dc component may be removed in another manner, and the manner of removing the dc component in the third preferred embodiment of the present invention is not limited.
Step S702, calculating a frequency doubling f according to the distance between the measured distance and a backlight (English) lamp wick of the display paneln；
The distance measured in step S702 may specifically be a distance between the detection device and the display panel, referring to fig. 5, fig. 5 is a method for obtaining the relative brightness of the display panel according to the second preferred embodiment of the present invention, where d2 is the measured distance, and d1 may be a distance between backlight wicks (the wicks are generally adjacent bright wicks and dark wicks); f above1Namely 1/theta (cycle/hierarchy); the calculation method of θ can be calculated by using the prior art scheme, for example, in an embodiment of the second preferred embodiment of the present invention, the θ can be calculated by using an inverse trigonometric function; of course, in other embodiments of the second preferred embodiment of the present invention, other ways to calculate θ can be used. The second preferred embodiment of the present invention is not limited to the above-described method for calculating θ. The cyc mentioned abovele/degree may be specifically a unit of frequency multiplication.
Step S703, performing DFT (discrete Fourier transform) conversion on the luminance moment to obtain F (fx);
F(fx)＝[Lx1,Lx2...........Lxn](ii) a Wherein,
lx1 is a 0/n frequency multiplication component, Lx2 is a 1/n frequency multiplication component, Lxn is an (n-1)/n frequency multiplication component, i.e., a frequency multiplication component, which is a frequency multiplication component for a frequency multiplication f1Obtaining a frequency multiplication component after DFT conversion; n may be the number of sample points of the luminance moment .
Step S704, converting F (F)x) The real and imaginary parts in the matrix are added to obtain a matrix FP(fx)；
FP(fx)＝|FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realCan be F (F)x) Real part of matrix, FP(fx)imagCan be F (F)x) The imaginary part of the matrix.
In the above step S704, | FP(fx)realThe | representation matrix FPAbsolute value of real part of (fx) | F in the above step S604P(fx)imagThe | representation matrix FP(fx) absolute value of imaginary part.
Step S705, calculating CSF (contrast sensitivity function) of the frequency multiplication matrix F, and calculating FP(fx) and CSF (f) are substituted into a second preset formula to calculate a mura value; the second preset formula may specifically be:
Q＝ΣFp(fx)·CSF(f)
wherein, CSF (f) 2.6 (0.0192+0.114 f) exp (0.114 f) 1.1)
JND＝Q/C；
Wherein C is an empirical constant, and f is a frequency multiplication matrix.
The frequency multiplication matrix f in the step S705 may be based on a frequency multiplication fnThe frequency multiplication matrix f may be specifically:
f＝[f1,f2...........fn]；
wherein f isnDenotes a frequency multiplication, f1Can be 0/n-frequency multiplication fn，f2Can be 1/n-frequency multiplication fn。
The value of the test constant C in the step S705 can be set by the manufacturer, for example, in one embodiment of the third preferred embodiment of the present invention, C can be set to 2000, but of course, in another embodiment of the third preferred embodiment of the present invention, C can be set to 2100 or other values, where Σ F in the above formulap(fx) may represent the matrix FP(fx) the sum of all real absolute values and all imaginary absolute values.
In the above step S705, JDN represents mura, and its specific calculation manner is, if Q is 2000, and C is 2000, JND is 2000/2000 is 1; if Q is calculated to 3000, JND is 3000/2000 is 1.5.
Referring to fig. 1 and 2, a detailed description will be given of technical effects achieved by the third preferred embodiment of the present invention, where fig. 1 is a schematic view of a wick arrangement of a direct-type LED backlight, fig. 2 is a view of a luminance distribution of a display panel in an X direction, where the luminance is higher at a position close to the wick to form a bright area, and the luminance is lower between two wicks due to being far away from the wick to form a dark area, so that mura of excessive brightness is generated on the entire display panel, and the mura is mainly generated by backlight and is generally called backlightmura. The method provided by the second preferred embodiment of the present invention calculates the mura value by quantization, and processes the relative luminance curve and the luminance matrix to obtain the matrix FP(fx), this matrix FPThe real and imaginary parts of (fx) canReflecting mura value, performing CSF treatment on the frequency multiplication matrix F to obtain CSF (F), and mixing CSF (F) and FPThe method has the advantages of high efficiency and high automation degree because of an automatic calculation mode and no need of manual participation, and the method is an objective calculation mode and does not need manual participation, so the cost is low.
Step S706, judging whether the display panel is qualified according to the mura value.
The implementation manner of the above step may specifically be that the mura value is compared with a threshold, and if the mura value is greater than the threshold, the display panel is determined to be unqualified. It should be noted that, the determination of the qualification of the display panel needs to be implemented by detecting various parameters, and the mura value lower than the threshold is only one detection parameter.
According to the technical scheme, the efficiency of detecting the display panel can be improved, the automation degree can be improved, the labor cost can be effectively reduced, and the error rate can be reduced.
Referring to fig. 8, fig. 8 is a system 800 for calculating a backlight mura value according to a fourth preferred embodiment of the present invention, where the system may be integrated or installed on an intelligent detection device, for example, on a computer or a server, as shown in fig. 8, the system may specifically include:
the sampling unit 801 is configured to obtain a relative brightness relative curve of the display panel and a brightness matrix of the display panel, and remove a dc component of the relative brightness curve to obtain a muramuramura component of the relative brightness curve;
the sampling unit 801 may acquire the relative luminance curve of the display panel in various ways, and the fourth preferred embodiment of the present invention is not limited to the above-mentioned acquisition way of the relative luminance curve, for example, in an embodiment of the fourth preferred embodiment of the present invention, the relative luminance curve may be acquired by a CCD (Charge-coupled device), and of course, in another embodiment of the fourth preferred embodiment of the present invention, the relative luminance curve may also be acquired by a camera of the same industry.
There are various ways to acquire the luminance matrix of the display panel in the sampling unit 801, and the first preferred embodiment of the present invention does not limit the specific manner of acquiring the luminance matrix.
The above-mentioned method for obtaining the mura component of the relative luminance curve by removing the dc component of the relative luminance curve in the sampling unit 801 may be various, for example, in an embodiment of the fourth preferred embodiment of the present invention, the relative luminance curve may be shifted downward to remove the dc component, as shown in fig. 4, but in a specific implementation, other manners may be adopted, for example, in another embodiment of the fourth preferred embodiment of the present invention, the value of the dc component of the relative luminance curve may be directly subtracted. Of course, in another embodiment of the first preferred embodiment of the present invention, the dc component may be removed in another manner, and the fourth preferred embodiment of the present invention is not limited to the manner of removing the dc component.
A frequency doubling unit 802 for calculating a frequency doubling f according to the distance between the measured distance and the backlight lamp wick of the display paneln；
The distance measured in the frequency doubling unit 802 may specifically be a distance between the detection device and the display panel, referring to fig. 5, fig. 5 is a method for obtaining the relative brightness of the display panel according to a fourth preferred embodiment of the present invention, where d2 is the measured distance, and d1 may be a distance between backlight wicks (the wicks are generally adjacent bright wicks and dark wicks); f abovenNamely 1/theta (cycle/hierarchy); the method of calculating theta may be calculated using prior art schemes, for example, in one embodiment of the fourth preferred embodiment of the present inventionThe theta can be calculated by means of an inverse trigonometric function; of course, in other embodiments of the fourth preferred embodiment of the present invention, other ways to calculate θ can be used. The fourth preferred embodiment of the present invention is not limited to the above-described method for calculating θ. The cycle/degree may be a unit of frequency multiplication.
A conversion unit 803, configured to perform DFT conversion on the luminance moment to obtain f (fx);
F(fx)＝[Lx1,Lx2...........Lxn](ii) a Wherein,
lx1 is 0/n frequency multiplication component, Lx2 is 1/n frequency multiplication component, Lxn is (n-1)/n frequency multiplication component, and n is the number of sampling points of luminence moment ;
a superposition unit 804 for adding F (F)x) The real and imaginary parts in the matrix are added to obtain a matrix FP(fx)；
FP(fx)＝|FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realIs F (F)x) Real part of matrix, FP(fx)imagIs F (F)x) A matrix imaginary part;
| F in the above-mentioned superimposing unit 804P(fx)realThe | representation matrix FP(fx) absolute value of real part, | F in the above step S304P(fx)imagThe | representation matrix FP(fx) absolute value of imaginary part.
A calculating unit 805, further configured to depend on the matrix FP(fx) and empirical constants were calculated to obtain mura values.
Preferably, the calculating unit 805 is specifically configured to:
f is to beP(fx) substituting the first preset formula to calculate a mura value; the first predetermined formula is:
Q＝ΣFp(fx)
JND＝Q/C；
where C is an empirical constant and JND is a mura value.
The value of the experimental constant C in the calculating unit 805 can be set by the manufacturer, for example, in one embodiment of the fourth preferred embodiment of the present invention, C can be set to 2000, but of course, in another embodiment of the fourth preferred embodiment of the present invention, C can be set to 2100 or other values, where Σ F in the above formulap(fx) may represent the matrix FP(fx) the sum of all real absolute values and all imaginary absolute values.
JDN in the calculating unit 805 indicates a mura value, and its specific calculation manner is, for example, Q is 2000, and if C is 2000, JND is 2000/2000 is 1; if Q is calculated to 3000, JND is 3000/2000 is 1.5.
Preferably, the calculating unit 805 is specifically configured to:
performing CS calculation on the frequency multiplication matrix F to obtain CSF (F), and calculating FP(fx) and CSF (f) are substituted into a second preset formula to calculate a mura value; the second preset formula is specifically as follows:
Q＝ΣFp(fx)·CSF(f)
wherein, CSF (f) 2.6 (0.0192+0.114 f) exp (0.114 f) 1.1)
JND＝Q/C；
Wherein C is an empirical constant, f is a frequency multiplication matrix, and JND is a mura value;
f＝[f1,f2...........fn]
wherein f isnDenotes a frequency multiplication, f1Is 0/n-frequency multiplication fn，f2Is 1/n-frequency multiplication fn。
The frequency multiplication matrix f in the calculating unit 805 may be based on a frequency multiplication fnThe frequency multiplication matrix f may be specifically:
f＝[f1,f2...........fn]；
wherein f isnDenotes a frequency multiplication, f1Can be 0/n-frequency multiplication fn，f2Can be 1/n-frequency multiplication fn。
The value of the experimental constant C in the calculating unit 805 can be set by the manufacturer, for example, in one embodiment of the third preferred embodiment of the present invention, C can be set to 2000, but of course, in another embodiment of the third preferred embodiment of the present invention, C can be set to 2100 or other values, where Σ F in the above formulap(fx) may represent the matrix FP(fx) the sum of all real absolute values and all imaginary absolute values.
JDN in the calculating unit 805 indicates a mura value, and its specific calculation manner is, for example, Q is 2000, and if C is 2000, JND is 2000/2000 is 1; if Q is calculated to 3000, JND is 3000/2000 is 1.5.
Preferably, the system may further include:
and a determining unit 806, configured to determine whether the display panel is qualified according to the mura value, and if the mura value is greater than a threshold, determine that the display panel is not qualified.
It should be noted that, the determination of the qualification of the display panel needs to be implemented by detecting various parameters, and the mura value lower than the threshold is only one detection parameter.
Referring to fig. 9, fig. 9 further provides a detection apparatus 900 according to the embodiment of the present invention, which includes a system 800 for calculating the mura value of the backlight source. For a specific structure of the backlight mura calculation system, reference may be made to the description of the fourth preferred embodiment of the present invention, and details are not described herein.
It should be noted that, for simplicity of description, the above-mentioned method embodiments or examples are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts described, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments or examples described in this specification are presently preferred, and that no acts or elements are necessarily required of the invention.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. Those skilled in the art may combine or combine features of different embodiments and features of different embodiments described in this specification.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by hardware, firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limiting: the computer-readable medium may include Random Access Memory (RAM), Read-only memory (ROM), electrically erasable programmable Read-only memory (EEPROM), compact disk Read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Furthermore, the method is simple. Any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, the coaxial cable, the fiber optic cable, the twisted pair, the DSL, or the wireless technologies such as infrared, radio, and microwave are included in the fixation of the medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy Disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for calculating a mura value of a backlight source is characterized by comprising the following steps:
acquiring a relative brightness relative curve of a display panel and a brightness matrix of the display panel, and removing a direct current component of the relative brightness curve to obtain a muramuramura component of the relative brightness curve;
calculating to obtain a frequency doubling f according to the distance between the measured distance and the backlight lamp wick of the display paneln；
DFT conversion is carried out on the luminance moment to obtain F (fx);
F(fx)＝[Lx1,Lx2...........Lxn](ii) a Wherein,
lx1 is 0/n frequency multiplication component, Lx2 is 1/n frequency multiplication component, Lxn is (n-1)/n frequency multiplication component, and n is the number of sampling points of luminence moment ;
f (F)x) The real and imaginary parts in the matrix are added to obtain a matrix FP(fx)；
FP(fx)＝|FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realIs F (F)x) Real part of matrix, FP(fx)imagIs F (F)x) A matrix imaginary part;
according to a matrix FP(fx) and empirical constants were calculated to obtain mura values.
2. The method of claim 1, wherein the dependency matrix FP(fx) and empirical constants to obtain the mura values specifically, including:
f is to beP(fx) substituting the first preset formula to calculate a mura value; the first predetermined formula is:
Q＝ΣFp(fx)
JND＝Q/C；
where C is an empirical constant and JND is a mura value.
3. The method of claim 1, wherein the dependency matrix FP(fx) and empirical constants to obtain the mura values specifically, including:
performing CS calculation on the frequency multiplication matrix F to obtain CSF (F), and calculating FP(fx) and CSF (f) are substituted into a second preset formula to calculate a mura value; the second preset formula is specifically as follows:
Q＝ΣFp(fx)·CSF(f)
wherein, CSF (f) 2.6 (0.0192+0.114 f) exp (0.114 f) 1.1)
JND＝Q/C；
Wherein C is an empirical constant, f is a frequency multiplication matrix, and JND is a mura value;
f＝[f1,f2...........fn]
wherein f isnDenotes a frequency multiplication, f1Is 0/n-frequency multiplication fn，f2Is 1/n-frequency multiplication fn。
4. A method according to any of claims 1-3, characterized in that the method further comprises:
and judging whether the display panel is qualified or not according to the mura value, and if the mura value is larger than a threshold value, judging that the display panel is unqualified.
5. A system for computing a backlight mura value, the system comprising:
the sampling unit is used for acquiring a relative brightness relative curve of the display panel and a brightness matrix of the display panel, and removing a direct current component of the relative brightness curve to obtain a muramuramura component of the relative brightness curve;
a frequency doubling unit for calculating a frequency doubling f according to the distance between the measured distance and the backlight lamp wick of the display paneln；
The conversion unit is used for performing DFT conversion on the luminance moment to obtain F (fx);
F(fx)＝[Lx1,Lx2...........Lxn](ii) a Wherein,
lx1 is 0/n frequency multiplication component, Lx2 is 1/n frequency multiplication component, Lxn is (n-1)/n frequency multiplication component, and n is the number of sampling points of luminence moment ;
a superimposing unit for superimposing F (F)x) The real and imaginary parts in the matrix are added to obtain a matrix FP(fx)；
FP(fx)＝|FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realIs F (F)x) Real part of matrix, FP(fx)imagIs F (F)x) A matrix imaginary part;
a computing unit for further processing according to the matrix FP(fx) and empirical constants were calculated to obtain mura values.
6. The system according to claim 5, wherein the computing unit is specifically configured to:
f is to beP(fx) substituting the first preset formula to calculate a mura value; the first predetermined formula is:
Q＝ΣFp(fx)
JND＝Q/C；
where C is an empirical constant and JND is a mura value.
7. The system according to claim 5, wherein the computing unit is specifically configured to:
performing CS calculation on the frequency multiplication matrix F to obtain CSF (F), and calculating FP(fx) and CSF (f) are substituted into a second preset formula to calculate a mura value; the second preset formula is specifically as follows:
Q＝ΣFp(fx)·CSF(f)
wherein, CSF (f) 2.6 (0.0192+0.114 f) exp (0.114 f) 1.1)
JND＝Q/C；
Wherein C is an empirical constant, f is a frequency multiplication matrix, and JND is a mura value;
f＝[f1,f2...........fn]
wherein f isnDenotes a frequency multiplication, f1Is 0/n-frequency multiplication fn，f2Is 1/n-frequency multiplication fn。
8. The system of any of claims 5-7, further comprising:
and the judging unit is used for judging whether the display panel is qualified or not according to the mura value, and if the mura value is larger than a threshold value, judging that the display panel is unqualified.
9. A testing device comprising a system for calculating a mura value of a backlight according to any of claims 5-8.
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