CN105512461B - Calculation method, system and the detection device of backlight mura value - Google Patents
Calculation method, system and the detection device of backlight mura value Download PDFInfo
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Abstract
The present invention provides calculation method, system and the detection devices of a kind of backlight mura value, the described method includes: taking the relative luminance curve and luminance matrix of display panel, the DC component for removing relative luminance curve obtains the mura component of relative luminance curve；A frequency multiplication is calculated according to measurement the distance between distance and backlight backlight wick；Luminance matrix is done into DFT and is converted to F (fx)；By F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；CS is carried out to frequency multiplication matrix f, CSF (f) is calculated, according to matrix FP(fx), mura value is calculated in CSF (f) and empirical.Technical solution provided by the invention has high-efficient, at low cost advantage.
Description
Technical field
The present invention relates to display field more particularly to a kind of calculation method, system and the detection devices of backlight mura value.
Background technique
Liquid crystal display (English: panel) is also known as LCD (full name in English: Liquid Crystal Display, Chinese: liquid crystal
Show device), it is currently used electronic display unit.In recent years, CCFL (full name in English: Cold Cathode
Fluorescent Lamp, Chinese: cathode fluorescent tube), the market of the illuminated LED backlight of direct-light type LED backlight and side
Occupation rate is higher and higher.For save the cost and visual appearance, it will usually the thickness of diffuser plate (diffuser plate) be thinned
Or the thickness of optical cavity is reduced, such scheme just has mura appearance.
In the scheme for realizing the prior art, the discovery prior art is had the following technical problems:
In the prior art, producer usually gives personnel training, then assesses mura by way of artificially observing
Value (producer having is also referred to as mura grade or mura seriousness)；Such method low efficiency, and the subjectivity artificially evaluated is too
Height, evaluation criterion is different, and mura value belongs to the important parameter of display panel, and mura value evaluation inaccuracy is easy to influence display panel
Quality.
Summary of the invention
A kind of calculation method of backlight mura value is provided, the calculation method of the backlight mura value carries out mura value
Quantization is automatic to be calculated, and without carrying out manual evaluation mura value, so it is with high-efficient, evaluation criterion is unified, objectivity is strong
Advantage.
In a first aspect, providing a kind of calculation method of backlight mura value, described method includes following steps:
Obtain the relative luminance relative luminance curve of display panel and the brightness luminance of display panel
Matrix, the DC component for removing relative luminance curve obtain the muramura component of relative luminance curve；
A frequency multiplication is calculated according to measurement the distance between distance and the backlight backlight wick of display panel
fn；
Luminance matrix is done into DFT and is converted to F (fx)；
F(fx)=[Lx1, Lx2...........Lxn]；Wherein,
Lx1 is 0/n harmonic, and Lx2 is 1/n harmonic, and Lxn is (n-1)/n harmonic, and n is luminance square
The number of sampling points of battle array；
By F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；
FP(fx)=| FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realFor F (fx) matrix real part, FP(fx)imagFor F (fx) matrix imaginary part；
According to matrix FP(fx) and mura value is calculated in empirical.
The calculation method of the backlight mura value provided with reference to first aspect, in the first preferred embodiment of first aspect
In, it is described according to matrix FP(fx) and empirical that mura value is calculated is specific, comprising:
By FP(fx) it substitutes into the first preset formula and mura value is calculated；First preset formula are as follows:
Q=Σ Fp(fx)
JND=Q/C；
Wherein, C is empirical, and JND is mura value.
The calculation method of the backlight mura value provided with reference to first aspect, in second of preferred embodiment of first aspect
In, it is described according to matrix FP(fx) and empirical that mura value is calculated is specific, comprising:
CS is carried out to frequency multiplication matrix f, CSF (f) is calculated, by FP(fx) it substitutes into the second preset formula with CSF (f) and calculates
Obtain mura value；Second preset formula specifically:
Q=Σ Fp(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 empirical, and f is frequency multiplication matrix, and JND is mura value；
F=[f1,f2...........fn]
Wherein, fnIndicate a frequency multiplication, f1For mono- frequency multiplication f of 0/nn, f2For mono- frequency multiplication f of 1/nn。
The calculation method of the backlight mura value provided with reference to first aspect, the first preferred embodiment of first aspect or first
Second of preferred embodiment of aspect, in the third preferred embodiment of first aspect, the method also includes:
Judge whether display panel is qualified according to the mura value, such as the mura value is greater than threshold value, then is judged as and does not conform to
Lattice.
Second aspect provides a kind of computing system of backlight mura value, the system comprises:
Sampling unit, for obtaining the relative luminance relative luminance curve and display panel of display panel
Brightness luminance matrix, the DC component for removing relative luminance curve obtain the muramura component of relative luminance curve；
Multiplier unit, based on according to measurement the distance between distance and the backlight backlight wick of display panel
Calculation obtains a frequency multiplication fn；
Converting unit is converted to F (fx) for luminance matrix to be DFT；
F(fx)=[Lx1, Lx2...........Lxn]；Wherein,
Lx1 is 0/n harmonic, and Lx2 is 1/n harmonic, and Lxn is (n-1)/n harmonic, and n is luminance square
The number of sampling points of battle array；
Superpositing unit is used for F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；
FP(fx)=| FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realFor F (fx) matrix real part, FP(fx)imagFor F (fx) matrix imaginary part；
Computing unit is also used to according to matrix FP(fx) and mura value is calculated in empirical.
In conjunction with the computing system for the backlight mura value that second aspect provides, in the first preferred embodiment of second aspect
In, the computing unit is specific, it is used for:
By FP(fx) it substitutes into the first preset formula and mura value is calculated；First preset formula are as follows:
Q=Σ Fp(fx)
JND=Q/C；
Wherein, C is empirical, and JND is mura value.
In conjunction with the computing system for the backlight mura value that second aspect provides, in second of preferred embodiment of second aspect
In, the computing unit is specific, it is used for:
CS is carried out to frequency multiplication matrix f, CSF (f) is calculated, by FP(fx) it substitutes into the second preset formula with CSF (f) and calculates
Obtain mura value；Second preset formula specifically:
Q=Σ Fp(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 empirical, and f is frequency multiplication matrix, and JND is mura value；
F=[f1,f2...........fn]
Wherein, fnIndicate a frequency multiplication, f1For mono- frequency multiplication f of 0/nn, f2For mono- frequency multiplication f of 1/nn。
Computing system, the first preferred embodiment of second aspect or second in conjunction with the backlight mura value of second aspect offer
Second of preferred embodiment of aspect, in the third preferred embodiment of second aspect, the system also includes:
Judging unit, for judging whether display panel is qualified according to the mura value, such as the mura value is greater than threshold value,
Then it is judged as unqualified.
The third aspect, provides a kind of detection device, and the detection device includes the backlight mura value that second aspect provides
Computing system, the third aspect the first preferred embodiment, second of preferred embodiment of the third aspect or the third aspect the third preferably
Scheme.
According to calculation method, system and the display panel of the backlight mura value that each embodiment provides, above-mentioned each implementation
Mode calculates mura value by way of quantization, to the relative luminance curve and luminance matrix carries out that mura value is calculated,
The method is due to for automatic calculation, so participated in without artificial, so it is with high-efficient, high degree of automation it is excellent
Point, and this mode also improves the speed and efficiency of detection display panel, and this mode is objective computation mode, and is not required to
Very important person is participates in, so its is at low cost, shows the calculated mura value and artificial (experienced) by practical calculating test
The mura value of judgement is almost consistent, thus its also to have the advantages that mura value calculates accurate.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is that the wick of direct-light type LED backlight in the prior art arranges schematic diagram；
Fig. 2 is Luminance Distribution schematic diagram of the display panel in X-direction in the prior art；
Fig. 3 is the flow chart of the calculation method of the backlight mura value in the first better embodiment of the invention；
Fig. 4 is the relative luminance curve schematic diagram that the specific embodiment of the invention provides；
Fig. 5 is the relative luminance curve schematic diagram for the acquisition display panel that the specific embodiment of the invention provides；
Fig. 6 is the flow chart of the calculation method of the backlight mura value in the second better embodiment of the invention；
Fig. 7 is the flow chart of the calculation method for the backlight mura value that third better embodiment of the present invention provides；
Fig. 8 is the computing system structural schematic diagram for the backlight mura value that the 4th better embodiment of the invention provides；
Fig. 9 is the structure of the detecting device schematic diagram that the specific embodiment of the invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Refering to Fig. 3, a kind of calculation method for backlight mura value that Fig. 3 the first better embodiment of the present invention provides should
Method can be executed by detection device, which includes but is not limited to: mobile phone, tablet computer, computer, smart camera etc.
Intelligent detection equipment, as shown in figure 3, this method comprises the following steps:
Step S301, relative luminance (English: the relative luminance) curve and display surface of display panel are obtained
Brightness (English: luminance) matrix of plate, the DC component for removing relative luminance curve obtain the mura of relative luminance curve
Component；
In above-mentioned steps S301 obtain display panel relative luminance curve mode can there are many, the present invention first compared with
Good embodiment does not limit the acquisition modes of above-mentioned relative luminance curve, for example, in the first better embodiment of the invention
One embodiment in, can pass through CCD (full name in English: Charge-coupled Device, Chinese referred to as: Charged Couple member
Part) imaging sensor obtains relative luminance curve, certainly in another embodiment of the first better embodiment of the invention,
Relative luminance curve can also be obtained by way of camera of the same trade or business.
In above-mentioned steps S301 obtain display panel luminance matrix mode can also there are many, the present invention first compared with
The specific acquisition modes of above-mentioned luminance matrix are not intended to limit in good embodiment.
The DC component for removing relative luminance curve in above-mentioned steps S301 obtains the mura component of relative luminance curve
Method can there are many, can be by relative luminance curve for example, in one embodiment of first better embodiment of the invention
Translation downwards is to remove DC component, as shown in figure 4, other modes can also be used certainly in specific practice, such as
In another embodiment of the first better embodiment of the invention, the DC component of relative luminance curve can be directly subtracted
Value.Certainly in the other embodiment of the first better embodiment of the invention, can also be removed using other modes straight
Flow component, the first better embodiment of the invention do not limit the above-mentioned mode for removing DC component.
Step S302, according to the distance between measurement distance and backlight (English: backlight) wick of display panel
A frequency multiplication f is calculatedn；
It measures distance in above-mentioned steps S302 to be specifically as follows, the distance between detection device and display panel, refering to figure
5, Fig. 5 be a kind of schematic diagram of the relative luminance for the acquisition display panel of the first preferred embodiment of the invention provided, wherein
D2 be measure distance, d1 can be between backlight lamp core (this wick ordinary circumstance is adjacent bright wick and concealed light core) away from
From；Above-mentioned fnThat is 1/ θ (cycle/degree)；The calculation method of the θ can be calculated using the scheme of the prior art, for example,
In one embodiment of the first better embodiment of the invention, the θ can be calculated by the way of antitrigonometric function；Certainly
In the other embodiments of the first better embodiment of the invention, θ can also be calculated using other modes.The present invention first
Better embodiment does not limit to the calculation method of above-mentioned θ.Above-mentioned cycle/degree is specifically as follows the unit of frequency multiplication.
Step S303, luminance matrix is done into DFT (full name in English: Discrete Fourier Transform.In
Literary fame claims: discrete Fourier transform) it is converted to F (fx)；
F(fx)=[Lx1, Lx2...........Lxn]；Wherein,
Lx1 be 0/n harmonic, Lx2 be 1/n harmonic, Lxn be (n-1)/n harmonic, i.e. a harmonic,
One harmonic is i.e. to a frequency multiplication fnHarmonic is obtained after DFT is converted；N can be the sampling of luminance matrix
Point number.
Step S304, by F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；
FP(fx)=| FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realIt can be F (fx) matrix real part, FP(fx)imagIt can be F (fx) matrix imaginary part.
In above-mentioned steps S304 | FP(fx)real| representing matrix FP(fx) absolute value of real part, in above-mentioned steps S304 | FP
(fx)imag| representing matrix FP(fx) absolute value of imaginary part.
Step S305, according to matrix FP(fx) and mura value (i.e. JND value) is calculated in empirical.
According to matrix F in above-mentioned steps S305P(fx) and empirical be calculated mura value can there are many mode, on
The mode for stating realization may refer to concrete scheme and the preferable embodiment party of third of the present invention of the second better embodiment of the invention
The concrete scheme of formula.
The technical solution of 1,2 pair of first better embodiment of present invention technical effect achieved carries out with reference to the accompanying drawing
Detailed description, as shown in FIG. 1, FIG. 1 is the wicks of direct-light type LED backlight to arrange schematic diagram, as shown in Fig. 2, Fig. 2 is display surface
Plate X-direction Luminance Distribution, when close to the position of wick, this position brightness can be higher to form clear zone, in two lamps
Due to thus being produced on entire display panel far from wick position so brightness can be lower to form dark space between core
Bright dark excessive mura is given birth to, due to mainly being generated by backlight, so commonly referred to as backlight mura.This hair
The method that bright first better embodiment provides calculates mura value by way of quantization, to the relative luminance curve and brightness
Matrix carries out that mura value is calculated, and the method so participating in without artificial for automatic calculation so it has due to imitating
The advantages of rate is high, high degree of automation, and this mode also improves the speed and efficiency of detection display panel, and this mode
It for objective computation mode, does not need artificially to participate in, so its is at low cost, shows that this is calculated by practical calculating test
Mura value is almost consistent with the mura value of artificial (experienced) judgement, thus its also to have the advantages that mura value calculates accurate.
Step S306, judge whether display panel is qualified according to the mura value.
The implementation of above-mentioned steps is specifically as follows, and the mura value and threshold value comparison, such as the mura value are greater than the threshold
Value, judges that display panel is unqualified.It should be noted that judging that display panel qualification is needed through detection many kinds of parameters come real
Existing, mura value is only a detection parameters lower than threshold value.
The technical solution can be improved the efficiency of display panel detection and improve the degree of automation, and can effectively drop
Low cost of labor and reduction error rate.
Refering to Fig. 6, a kind of calculation method for backlight mura value that Fig. 6 the second better embodiment of the present invention provides should
Method can have detection device to realize, which includes but is not limited to: mobile phone, tablet computer, computer, smart camera
Equal intelligent detection equipments, as shown in fig. 6, this method comprises the following steps:
Step S601, relative luminance (English: the relative luminance) curve and display surface of display panel are obtained
Brightness (English: luminance) matrix of plate, the DC component for removing relative luminance curve obtain the mura of relative luminance curve
Component；
In above-mentioned steps S601 obtain display panel relative luminance curve mode can there are many, the present invention second compared with
Good embodiment does not limit the acquisition modes of above-mentioned relative luminance curve, for example, in the second better embodiment of the invention
One embodiment in, can pass through CCD (full name in English: Charge-coupled Device, Chinese referred to as: Charged Couple member
Part) imaging sensor obtains relative luminance curve, certainly in another embodiment of the second better embodiment of the invention,
Relative luminance curve can also be obtained by way of camera of the same trade or business.
In above-mentioned steps S601 obtain display panel luminance matrix mode can also there are many, the present invention second compared with
The specific acquisition modes of above-mentioned luminance matrix are not intended to limit in good embodiment.
The DC component for removing relative luminance curve in above-mentioned steps S601 obtains the mura component of relative luminance curve
Method can there are many, can be by relative luminance curve for example, in one embodiment of second better embodiment of the invention
Translation downwards is to remove DC component, as shown in figure 4, other modes can also be used certainly in specific practice, such as
In another embodiment of the second better embodiment of the invention, the DC component of relative luminance curve can be directly subtracted
Value.Certainly in the other embodiment of the second better embodiment of the invention, can also be removed using other modes straight
Flow component, the second better embodiment of the invention do not limit the above-mentioned mode for removing DC component.
Step S602, according to the distance between measurement distance and backlight (English: backlight) wick of display panel
A frequency multiplication f is calculatedn；
It measures distance in above-mentioned steps S602 to be specifically as follows, the distance between detection device and display panel, refering to figure
5, Fig. 5 be a kind of method of the relative luminance for the acquisition display panel of the second preferred embodiment of the invention provided, wherein d2
As measure distance, d1 can be between backlight lamp core (this wick ordinary circumstance is adjacent bright wick and concealed light core) away from
From；Above-mentioned fnThat is 1/ θ (cycle/degree)；The calculation method of the θ can be calculated using the scheme of the prior art, for example,
In one embodiment of the second better embodiment of the invention, the θ can be calculated by the way of antitrigonometric function；Certainly
In the other embodiments of the second better embodiment of the invention, θ can also be calculated using other modes.The present invention second
Better embodiment does not limit to the calculation method of above-mentioned θ.Above-mentioned cycle/degree is specifically as follows the unit of frequency multiplication.
Step S603, luminance matrix is done into DFT (full name in English: Discrete Fourier Transform.In
Literary fame claims: discrete Fourier transform) it is converted to F (fx)；
F(fx)=[Lx1, Lx2...........Lxn]；Wherein,
Lx1 be 0/n harmonic, Lx2 be 1/n harmonic, Lxn be (n-1)/n harmonic, i.e. a harmonic,
One harmonic is i.e. to a frequency multiplication fnHarmonic is obtained after DFT is converted；N can be the sampling of luminance matrix
Point number.
Step S604, by F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；
FP(fx)=| FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realIt can be F (fx) matrix real part, FP(fx)imagIt can be F (fx) matrix imaginary part.
In above-mentioned steps S604 | FP(fx)real| representing matrix FP(fx) absolute value of real part, in above-mentioned steps S604 | FP
(fx)imag| representing matrix FP(fx) absolute value of imaginary part.
Step S605, by FP(fx) it substitutes into the first preset formula and mura value is calculated；First preset formula specifically may be used
With are as follows:
Q=Σ Fp(fx)
JND=Q/C；
Wherein, C is empirical.
The value of empirical C can be preferably real by producer's sets itself, such as in the present invention second in above-mentioned steps S605
Apply in one embodiment of mode, C can be set becomes 2000, certainly second better embodiment of the invention another
In embodiment, C can be set as to 2100 or other numerical value, Σ F in above-mentioned formulapIt (fx) can be with representing matrix FP(fx) institute
There is the sum of real part absolute value and all imaginary part absolute values.
JDN indicates mura value, specific calculation, as Q is calculated as 2000 in above-mentioned steps S605, it is assumed that C=2000,
Then JND=2000/2000=1；If Q is calculated as 3000, then JND=3000/2000=1.5.
The technical solution of 1,2 pair of second better embodiment of present invention technical effect achieved carries out with reference to the accompanying drawing
Detailed description, as shown in FIG. 1, FIG. 1 is the wicks of direct-light type LED backlight to arrange schematic diagram, as shown in Fig. 2, Fig. 2 is display surface
Plate X-direction Luminance Distribution, when close to the position of wick, this position brightness can be higher to form clear zone, in two lamps
Due to thus being produced on entire display panel far from wick position so brightness can be lower to form dark space between core
Bright dark excessive mura is given birth to, due to mainly being generated by backlight, so commonly referred to as backlight mura.This hair
The method that bright second better embodiment provides calculates mura value by way of quantization, to the relative luminance curve and brightness
Matrix is handled to obtain matrix FP(fx), this matrix FP(fx) real and imaginary parts can embody mura value, all real parts and
Imaginary part, which is mutually added up, can be calculated mura value divided by empirical, and the method is due to for automatic calculation, so nothing
It need to manually participate in, so it is with high-efficient, the advantages of high degree of automation, and this mode also improves detection display panel
Speed and efficiency, and this mode be objective computation mode, do not need artificially to participate in, so its is at low cost, pass through reality
It calculates test and shows that the calculated mura value is almost consistent with the mura value of artificial (experienced) judgement, so it also has
It is accurate to have the advantages that mura value calculates.
Step S606, judge whether display panel is qualified according to the mura value.
The implementation of above-mentioned steps is specifically as follows, and the mura value and threshold value comparison, such as the mura value are greater than the threshold
Value, judges that display panel is unqualified.It should be noted that judging that display panel qualification is needed through detection many kinds of parameters come real
Existing, mura value is only a detection parameters lower than threshold value.
The technical solution can be improved the efficiency of display panel detection and improve the degree of automation, and can effectively drop
Low cost of labor and reduction error rate.
Refering to Fig. 7, a kind of calculation method for backlight mura value that Fig. 7 third better embodiment of the present invention provides should
Method can have detection device to realize, which includes but is not limited to: mobile phone, tablet computer, computer, smart camera
Equal intelligent detection equipments, as shown in fig. 7, this method comprises the following steps:
Step S701, relative luminance (English: the relative luminance) curve and display surface of display panel are obtained
Brightness (English: luminance) matrix of plate, the DC component for removing relative luminance curve obtain the mura of relative luminance curve
Component；
In above-mentioned steps S701 obtain display panel relative luminance curve mode can there are many, third of the present invention compared with
Good embodiment does not limit the acquisition modes of above-mentioned relative luminance curve, for example, in third better embodiment of the present invention
One embodiment in, can pass through CCD (full name in English: Charge-coupled Device, Chinese referred to as: Charged Couple member
Part) imaging sensor obtains relative luminance curve, certainly in another embodiment of third better embodiment of the present invention,
Relative luminance curve can also be obtained by way of camera of the same trade or business.
In above-mentioned steps S701 obtain display panel luminance matrix mode can also there are many, third of the present invention compared with
The specific acquisition modes of above-mentioned luminance matrix are not intended to limit in good embodiment.
The DC component for removing relative luminance curve in above-mentioned steps S701 obtains the mura component of relative luminance curve
Method can there are many, can be by relative luminance curve for example, in one embodiment of third better embodiment of the present invention
Translation downwards is to remove DC component, as shown in figure 4, other modes can also be used certainly in specific practice, such as
In another embodiment of third better embodiment of the present invention, the DC component of relative luminance curve can be directly subtracted
Value.Certainly in the other embodiment of third better embodiment of the present invention, can also be removed using other modes straight
Flow component, third better embodiment of the present invention do not limit the above-mentioned mode for removing DC component.
Step S702, according to the distance between measurement distance and backlight (English: backlight) wick of display panel
A frequency multiplication f is calculatedn；
It measures distance in above-mentioned steps S702 to be specifically as follows, the distance between detection device and display panel, refering to figure
5, Fig. 5 be a kind of method of the relative luminance for the acquisition display panel of the second preferred embodiment of the invention provided, wherein d2
As measure distance, d1 can be between backlight lamp core (this wick ordinary circumstance is adjacent bright wick and concealed light core) away from
From；Above-mentioned f1That is 1/ θ (cycle/degree)；The calculation method of the θ can be calculated using the scheme of the prior art, for example,
In one embodiment of the second better embodiment of the invention, the θ can be calculated by the way of antitrigonometric function；Certainly
In the other embodiments of the second better embodiment of the invention, θ can also be calculated using other modes.The present invention second
Better embodiment does not limit to the calculation method of above-mentioned θ.Above-mentioned cycle/degree is specifically as follows the unit of frequency multiplication.
Step S703, luminance matrix is done into DFT (full name in English: Discrete Fourier Transform.In
Literary fame claims: discrete Fourier transform) it is converted to F (fx)；
F(fx)=[Lx1, Lx2...........Lxn]；Wherein,
Lx1 be 0/n harmonic, Lx2 be 1/n harmonic, Lxn be (n-1)/n harmonic, i.e. a harmonic,
One harmonic is i.e. to a frequency multiplication f1Harmonic is obtained after DFT is converted；N can be the sampling of luminance matrix
Point number.
Step S704, by F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；
FP(fx)=| FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realIt can be F (fx) matrix real part, FP(fx)imagIt can be F (fx) matrix imaginary part.
In above-mentioned steps S704 | FP(fx)real| representing matrix FP(fx) absolute value of real part, in above-mentioned steps S604 | FP
(fx)imag| representing matrix FP(fx) absolute value of imaginary part.
Step S705, to frequency multiplication matrix f carry out CSF (full name in English: Contrast Sensitivity Function, in
Text: contrast sensitivity function) CSF (f) is calculated, by FP(fx) it substitutes into the second preset formula with CSF (f) and is calculated
Mura value；Second preset formula is specifically as follows:
Q=Σ Fp(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 empirical, and f is frequency multiplication matrix.
Frequency multiplication matrix f in above-mentioned steps S705 can be according to a frequency multiplication fnIt obtains, frequency multiplication matrix f is specifically as follows:
F=[f1,f2...........fn]；
Wherein, fnIndicate a frequency multiplication, f1It can be mono- frequency multiplication f of 0/nn, f2It can be mono- frequency multiplication f of 1/nn。
The value of empirical C can be preferably real by producer's sets itself, such as in third of the present invention in above-mentioned steps S705
Apply in one embodiment of mode, can by C set become 2000, certainly third better embodiment of the present invention another
In embodiment, C can be set as to 2100 or other numerical value, Σ F in above-mentioned formulapIt (fx) can be with representing matrix FP(fx) institute
There is the sum of real part absolute value and all imaginary part absolute values.
JDN indicates mura value, specific calculation, as Q is calculated as 2000 in above-mentioned steps S705, it is assumed that C=2000,
Then JND=2000/2000=1；If Q is calculated as 3000, then JND=3000/2000=1.5.
The technical solution of 1,2 pair of third better embodiment of the present invention technical effect achieved carries out with reference to the accompanying drawing
Detailed description, as shown in FIG. 1, FIG. 1 is the wicks of direct-light type LED backlight to arrange schematic diagram, as shown in Fig. 2, Fig. 2 is display surface
Plate X-direction Luminance Distribution, when close to the position of wick, this position brightness can be higher to form clear zone, in two lamps
Due to thus being produced on entire display panel far from wick position so brightness can be lower to form dark space between core
Bright dark excessive mura is given birth to, due to mainly being generated by backlight, so commonly referred to as backlight mura.This hair
The method that bright second better embodiment provides calculates mura value by way of quantization, to the relative luminance curve and brightness
Matrix is handled to obtain matrix FP(fx), this matrix FP(fx) real and imaginary parts can embody mura value, to frequency multiplication matrix f
CSF (f) is obtained after carrying out CSF processing, by CSF (f) and FP(fx) take and more can accurately embody mura value, the method due to
For automatic calculation, so participated in without artificial, so it is with high-efficient, the advantages of high degree of automation, and this side
Formula also improves the speed and efficiency of detection display panel, and this mode is objective computation mode, does not need artificially to participate in,
So its is at low cost, pass through the practical mura for calculating test and showing the calculated mura value and artificial (experienced) judgement
Be worth it is almost consistent, so its also to have the advantages that mura value calculates accurate.
Step S706, judge whether display panel is qualified according to the mura value.
The implementation of above-mentioned steps is specifically as follows, and the mura value and threshold value comparison, such as the mura value are greater than the threshold
Value, judges that display panel is unqualified.It should be noted that judging that display panel qualification is needed through detection many kinds of parameters come real
Existing, mura value is only a detection parameters lower than threshold value.
The technical solution can be improved the efficiency of display panel detection and improve the degree of automation, and can effectively drop
Low cost of labor and reduction error rate.
Refering to Fig. 8, Fig. 8 is a kind of computing system for backlight mura value that the 4th better embodiment of the invention provides
800, above system can integrate or be mounted on intelligent detection equipment, such as install on the computer or server, such as Fig. 8 institute
Show, which can specifically include:
Sampling unit 801, for obtaining the relative luminance relative luminance curve and display surface of display panel
The brightness luminance matrix of plate, the DC component for removing relative luminance curve obtain muramura points of relative luminance curve
Amount；
Obtained in above-mentioned sampling unit 801 relative luminance curve of display panel mode can there are many, the present invention the
Four better embodiments do not limit the acquisition modes of above-mentioned relative luminance curve, for example, preferably implementing in the present invention the 4th
In one embodiment of mode, CCD (full name in English: Charge-coupled Device, Chinese abbreviation: charge coupling can be passed through
Closing element) imaging sensor obtains relative luminance curve, certainly in another implementation of the 4th better embodiment of the invention
In example, relative luminance curve can also be obtained by way of camera of the same trade or business.
Obtained in above-mentioned sampling unit 801 luminance matrix of display panel mode can also there are many, in the present invention the
The specific acquisition modes of above-mentioned luminance matrix are not intended to limit in one better embodiment.
The DC component for removing relative luminance curve in above-mentioned sampling unit 801 obtains the mura component of relative luminance curve
Method can there are many, for example, can write music relatively bright in one embodiment of 4th better embodiment of the invention
Line translates downwards to remove DC component, as shown in figure 4, certainly in specific practice, it can also be using other modes, example
Such as in another embodiment of the 4th better embodiment of the invention, the DC component of relative luminance curve can be directly subtracted
Value.Certainly in the other embodiment of the first better embodiment of the invention, can also be removed using other modes
DC component, the 4th better embodiment of the invention do not limit the above-mentioned mode for removing DC component.
Multiplier unit 802, for according to measurement the distance between distance and the backlight backlight wick of display panel
A frequency multiplication f is calculatedn；
It measures distance in above-mentioned multiplier unit 802 to be specifically as follows, the distance between detection device and display panel, refering to
Fig. 5, Fig. 5 are a kind of method of the relative luminance for the acquisition display panel of the 4th preferred embodiment of the invention provided, wherein
D2 be measure distance, d1 can be between backlight lamp core (this wick ordinary circumstance is adjacent bright wick and concealed light core) away from
From；Above-mentioned fnThat is 1/ θ (cycle/degree)；The calculation method of the θ can be calculated using the scheme of the prior art, for example,
In one embodiment of the 4th better embodiment of the invention, the θ can be calculated by the way of antitrigonometric function；Certainly
In the other embodiments of the 4th better embodiment of the invention, θ can also be calculated using other modes.The present invention the 4th
Better embodiment does not limit to the calculation method of above-mentioned θ.Above-mentioned cycle/degree is specifically as follows the unit of frequency multiplication.
Converting unit 803 is converted to F (fx) for luminance matrix to be DFT；
F(fx)=[Lx1, Lx2...........Lxn]；Wherein,
Lx1 is 0/n harmonic, and Lx2 is 1/n harmonic, and Lxn is (n-1)/n harmonic, and n is luminance square
The number of sampling points of battle array；
Superpositing unit 804 is used for F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；
FP(fx)=| FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realFor F (fx) matrix real part, FP(fx)imagFor F (fx) matrix imaginary part；
In above-mentioned superpositing unit 804 | FP(fx)real| representing matrix FP(fx) absolute value of real part, in above-mentioned steps S304 |
FP(fx)imag| representing matrix FP(fx) absolute value of imaginary part.
Computing unit 805 is also used to according to matrix FP(fx) and mura value is calculated in empirical.
Preferably, computing unit 805 is specific, is used for:
By FP(fx) it substitutes into the first preset formula and mura value is calculated；First preset formula are as follows:
Q=Σ Fp(fx)
JND=Q/C；
Wherein, C is empirical, and JND is mura value.
The value of empirical C can be preferable by producer's sets itself, such as in the present invention the 4th in above-mentioned computing unit 805
In one embodiment of embodiment, C can be set becomes 2000, certainly in the another of the 4th better embodiment of the invention
In a embodiment, C can be set as to 2100 or other numerical value, Σ F in above-mentioned formulapIt (fx) can be with representing matrix FP(fx)
The sum of all real part absolute values and all imaginary part absolute values.
JDN indicates mura value, specific calculation, as Q is calculated as 2000, it is assumed that C=in above-mentioned computing unit 805
2000, then JND=2000/2000=1；If Q is calculated as 3000, then JND=3000/2000=1.5.
Preferably, computing unit 805 is specific, is used for:
CS is carried out to frequency multiplication matrix f, CSF (f) is calculated, by FP(fx) it substitutes into the second preset formula with CSF (f) and calculates
Obtain mura value；Second preset formula specifically:
Q=Σ Fp(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 empirical, and f is frequency multiplication matrix, and JND is mura value；
F=[f1,f2...........fn]
Wherein, fnIndicate a frequency multiplication, f1For mono- frequency multiplication f of 0/nn, f2For mono- frequency multiplication f of 1/nn。
Frequency multiplication matrix f in above-mentioned computing unit 805 can be according to a frequency multiplication fnIt obtains, frequency multiplication matrix f specifically can be with
Are as follows:
F=[f1,f2...........fn]；
Wherein, fnIndicate a frequency multiplication, f1It can be mono- frequency multiplication f of 0/nn, f2It can be mono- frequency multiplication f of 1/nn。
The value of empirical C can be preferable by producer's sets itself, such as in third of the present invention in above-mentioned computing unit 805
In one embodiment of embodiment, C can be set becomes 2000, certainly in the another of third better embodiment of the present invention
In a embodiment, C can be set as to 2100 or other numerical value, Σ F in above-mentioned formulapIt (fx) can be with representing matrix FP(fx)
The sum of all real part absolute values and all imaginary part absolute values.
JDN indicates mura value, specific calculation, as Q is calculated as 2000, it is assumed that C=in above-mentioned computing unit 805
2000, then JND=2000/2000=1；If Q is calculated as 3000, then JND=3000/2000=1.5.
Preferably, above system can also include:
Judging unit 806, for judging whether display panel is qualified according to the mura value, such as the mura value is greater than threshold
Value, then be judged as unqualified.
It should be noted that judging that display panel qualification needs to realize by detection many kinds of parameters, mura value is lower than threshold
Value is only a detection parameters.
Refering to Fig. 9, Fig. 9 specific embodiment of the invention also provides a kind of detection device 900, and above-mentioned detection device includes back
The computing system 800 of light source mura value.The specific structure of the computing system of backlight mura value may refer to the present invention the 4th
The description of better embodiment, which is not described herein again.
It should be noted that for each method embodiment above-mentioned or embodiment, for simple description, therefore by its all table
It states as a series of action combinations, but those skilled in the art should understand that, the present invention is not by described sequence of movement
Limitation because according to the present invention, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art
Member also should be aware of, and embodiment or embodiment described in the specification belong to preferred embodiment, related movement and list
Member is not necessarily essential to the invention.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
The steps in the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.
Unit in the device of that embodiment of the invention can be combined, divided and deleted according to actual needs.This field
The feature of different embodiments described in this specification and different embodiments can be combined or be combined by technical staff.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can be with
It is realized with hardware realization or firmware realization or their combination mode.It when implemented in software, can be by above-mentioned function
Storage in computer-readable medium or as on computer-readable medium one or more instructions or code transmitted.Meter
Calculation machine readable medium includes computer storage media and communication media, and wherein communication media includes convenient for from a place to another
Any medium of a place transmission computer program.Storage medium can be any usable medium that computer can access.With
For this but be not limited to: computer-readable medium may include random access memory (Random Access Memory,
RAM), read-only memory (Read-Only Memory, ROM), Electrically Erasable Programmable Read-Only Memory (Electrically
Erasable Programmable Read-Only Memory, EEPROM), CD-ROM (Compact Disc Read-
Only Memory, CD-ROM) or other optical disc storages, magnetic disk storage medium or other magnetic storage apparatus or can be used in
Carry or storage have instruction or data structure form desired program code and can by computer access any other
Medium.Furthermore.Any connection appropriate can become computer-readable medium.For example, if software is using coaxial cable, light
Fine optical cable, twisted pair, Digital Subscriber Line (Digital Subscriber Line, DSL) or such as infrared ray, radio and
The wireless technology of microwave etc is transmitted from website, server or other remote sources, then coaxial cable, optical fiber cable, double
The wireless technology of twisted wire, DSL or such as infrared ray, wireless and microwave etc includes in the fixing of affiliated medium.Such as this hair
Used in bright, disk (Disk) and dish (disc) include compress optical disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD),
Floppy disk and Blu-ray Disc, the usually magnetic replicate data of which disk, and dish is then with laser come optical replicate data.Group above
Conjunction should also be as including within the protection scope of computer-readable medium.
In short, being not intended to limit of the invention the foregoing is merely the preferred embodiment of technical solution of the present invention
Protection scope.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in
Within protection scope of the present invention.
Claims (7)
1. a kind of calculation method of backlight mura value, which is characterized in that described method includes following steps:
The relative luminance curve of display panel and the luminance matrix of display panel are obtained, the DC component of relative luminance curve is removed
Obtain the mura component of relative luminance curve；
A frequency multiplication f is calculated according to measurement the distance between distance and the backlight wick of display paneln；
Luminance matrix is done into DFT and is converted to F (fx)；
F(fx)=[Lx1, Lx2......Lxn]；Wherein,
Lx1 is 0/n harmonic, and Lx2 is 1/n harmonic, and Lxn is (n-1)/n harmonic, and n is the sampling of luminance matrix
Point number；
By F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；
FP(fx)=| FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realFor F (fx) matrix real part, FP(fx)imagFor F (fx) matrix imaginary part；
According to matrix FP(fx) and mura value is calculated in empirical；The foundation matrix FP(fx) it is calculated with empirical
It is specifically included to mura value:
By FP(fx) it substitutes into the first preset formula and mura value is calculated；First preset formula are as follows:
Q=∑ Fp(fx)
JND=Q/C；
Wherein, C is empirical, and JND is mura value.
2. the method according to claim 1, wherein described according to matrix FP(fx) it is calculated with empirical
Mura value specifically includes:
Sensitivity function is compared to frequency multiplication matrix f, CSF (f) is calculated, by FP(fx) and CSF (f) substitutes into the second default public affairs
Mura value is calculated in formula；Second preset formula specifically:
Q=∑ Fp(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 empirical, and f is frequency multiplication matrix, and JND is mura value；
F=[f1,f2......fn]
Wherein, fnIndicate a frequency multiplication, f1For mono- frequency multiplication f of 0/nn, f2For mono- frequency multiplication f of 1/nn。
3. method according to claim 1 to 2, which is characterized in that the method also includes:
Judge whether display panel is qualified according to the mura value, if the mura value is greater than threshold value, is judged as unqualified.
4. a kind of computing system of backlight mura value, which is characterized in that the system comprises:
Sampling unit removes relative luminance for obtaining the relative luminance curve of display panel and the luminance matrix of display panel
The DC component of curve obtains the mura component of relative luminance curve；
Multiplier unit, for a frequency multiplication f to be calculated according to measurement the distance between distance and the backlight wick of display paneln；
Converting unit is converted to F (fx) for luminance matrix to be DFT；
F(fx)=[Lx1, Lx2......Lxn]；Wherein,
Lx1 is 0/n harmonic, and Lx2 is 1/n harmonic, and Lxn is (n-1)/n harmonic, and n is the sampling of luminance matrix
Point number；
Superpositing unit is used for F (fx) real part in matrix mutually sums it up imaginary part and be added to obtain matrix FP(fx)；
FP(fx)=| FP(fx)real|+|FP(fx)imag|
Wherein, FP(fx)realFor F (fx) matrix real part, FP(fx)imagFor F (fx) matrix imaginary part；
Computing unit is also used to according to matrix FP(fx) and mura value is calculated in empirical；The computing unit is specifically used
In:
By FP(fx) it substitutes into the first preset formula and mura value is calculated；First preset formula are as follows:
Q=∑ Fp(fx)
JND=Q/C；
Wherein, C is empirical, and JND is mura value.
5. system according to claim 4, which is characterized in that the computing unit is specifically used for:
Sensitivity function is compared to frequency multiplication matrix f, CSF (f) is calculated, by FP(fx) and CSF (f) substitutes into the second default public affairs
Mura value is calculated in formula；Second preset formula specifically:
Q=∑ Fp(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 empirical, and f is frequency multiplication matrix, and JND is mura value；
F=[f1,f2......fn]
Wherein, fnIndicate a frequency multiplication, f1For mono- frequency multiplication f of 0/nn, f2For mono- frequency multiplication f of 1/nn。
6. according to any system of claim 4-5, which is characterized in that the system also includes:
Judging unit, for judging whether display panel is qualified according to the mura value, if the mura value is greater than threshold value,
It is judged as unqualified.
7. a kind of detection device, which is characterized in that the detection device includes the backlight as described in claim 4-6 is any
The computing system of mura value.
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| CN102855856A (en) * | 2012-08-30 | 2013-01-02 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display and driving method for eliminating Mura thereof |
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