CN109246425A - LCD TV white balance test method - Google Patents
LCD TV white balance test method Download PDFInfo
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- CN109246425A CN109246425A CN201810979533.7A CN201810979533A CN109246425A CN 109246425 A CN109246425 A CN 109246425A CN 201810979533 A CN201810979533 A CN 201810979533A CN 109246425 A CN109246425 A CN 109246425A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control
Abstract
LCD TV white balance test method of the invention, according to the positively nonlinear correlation relationship of R gain and the positively nonlinear correlation relationship of X chromaticity coordinates, G gain and Y chromaticity coordinates and B gain is related with the non-linear negative correlation of X chromaticity coordinates and Y chromaticity coordinates respectively obtains target color point (X the most accuratec, Yc).By X chromaticity coordinates close to first object color dot value XcIn the case where allow three primary colors initial value (R0, G0, B0) also in three primary colors limits value (Rmax, Gmax, Bmax) in；Change R simultaneously0、G0And B0Value, by the second aim colour point value YcClose to the Y with reference to color dotTIn the case where first object color dot value XcClose to the X with reference to color dotTAnd allow three primary colors initial value (R0, G0, B0) it is in three primary colors limits value (Rmax, Gmax, Bmax) in, obtain more true target color point (Xc, Yc), white balance test effect is good.
Description
Technical field
The present invention relates to white balance debugging fields, more particularly to a kind of LCD TV white balance test method.
Background technique
Currently, white balance, literal understanding is the balance of white.White balance is three base of red, green, blue in description display
One index of the mixture of colours white accuracy after generating.White balance is the very important concept in one, telephotography field, is passed through
It can solve a series of problems of color rendition and tone processing.White balance is produced as electron image reproducing colors are true
Raw, in the relatively early of professional field of photography white balance application, it is also extensively used in present domestic electronic appliances, however technology
Development is so that blank level adjustment becomes more and more simply to be easy, but many users also have little understanding the working principle of white balance,
There are many mistaken ideas in understanding.It is to realize that camera review can more accurately reflect the color situation of object, is had white flat manually
The modes such as weighing apparatus and automatic white balance.Many people can encounter such problems when shooting using DV: in day
The image shot in the room of light lamp can seem that greening, the scenery shot under tungsten light indoors will be partially yellow, and
Then somehow or other is partially blue for the photo that daylight shaded side takes, and reason is that in the setting of white balance.
In the manufacturing process of liquid crystal display, when especially liquid crystal display is produced, need to carry out liquid crystal display white
Balance test, so that liquid crystal display reaches optimal white balance state.
Summary of the invention
The purpose of the present invention is overcoming shortcoming in the prior art, a kind of preferable liquid of white balance debugging effect is provided
Brilliant TV white balance test method.
The purpose of the present invention is achieved through the following technical solutions:
A kind of LCD TV white balance test method, includes the following steps:
Step S100 sets the three primary colors limits value (R of liquid crystal displaymax, Gmax, Bmax), setting refers to color dot (XT,
YT), set allowable error value (Xe, Ye)；
Step S200 obtains the three primary colors initial value (R of liquid crystal display0, G0, B0), obtain current color dot (X0, Y0)；
Step S300, for B0The first debugging step-length b is chosen, liquid crystal display is calculated according to following first function relationship
First debugging value B of screenc, Bc=B0+ ab, a=a+1, wherein a is constant, and by the first debugging value BcIt is input to liquid crystal
In display screen, and corresponding acquisition first color dot debugging value Xc；
Step S400 is calculated the first three primary colors according to following second function relationship and terminates debugging judgment value Bd, Bd=
Bmax-Bc, first color dot is calculated according to following third functional relation and terminates debugging judgment value Xd=| Xc-XT|, if full simultaneously
Sufficient Xd≤XeAnd BdFor positive number, then X is definedcFor first object color dot value；Otherwise, S300 is returned to step；
Step S500, for G0The second debugging step-length d is chosen, acquisition liquid crystal is calculated according to following 4th functional relation
Second debugging value G of display screenc, Gc=G0+ cd, c=c+1, wherein c is constant, and by the second debugging value GcIt is input to liquid
In crystal display screen, and the second color dot debugging value Y of corresponding acquisitionc；
Step S600 is calculated the second three primary colors according to following 5th functional relation and terminates debugging judgment value Gd, Gd=
Gmax-Gc, the second color dot is calculated according to following 6th functional relation and terminates debugging judgment value Yd, Yd=| Yc-YT|, if simultaneously
Meet Yd≤YeAnd GdFor positive number, then Y is definedcFor the second aim colour point value；Otherwise, S500 is returned to step；
Step S700 exports target color point (Xc, Yc), according to the target color point (Xc, Yc) debug the white flat of LCD TV
Weighing apparatus.
In a wherein embodiment, in the step S100, the three primary colors limits value (Rmax, Gmax, Bmax)
Setting operation specifically comprise the following steps:
Three primary colors initial value (the R of liquid crystal display is obtained in real timei, Gi, Bi), and current color dot (X is acquired in real timei, Yi)；
Obtain RiValue and color dot value XiNon-linear relation starting point, be defined as (Rmax, Xmax)；Obtain GiValue and color dot
Value YiNon-linear relation starting point, be defined as (Gmax, Ymax)；
Obtain BiValue and color dot value YiNon-linear relation starting point, be defined as (Bmax, Ymax)。
In a wherein embodiment, in the step S200, the three primary colors limits value of the liquid crystal display
(Rmax, Gmax, Bmax) with obtain liquid crystal display three primary colors initial value (R0, G0, B0) meet following relationship:
Rmax≥R0, Gmax≥G0, Bmax≥B0。
In a wherein embodiment, in step S300, the first debugging step-length b is positive number.
Compared with prior art, the present invention has at least the following advantages:
LCD TV white balance test method of the invention, according to the positively nonlinear correlation relationship of R gain and X chromaticity coordinates,
The positively nonlinear correlation relationship and B gain of G gain and Y chromaticity coordinates are born with X chromaticity coordinates and the non-linear of Y chromaticity coordinates respectively
It is related to obtain target color point (X the most accuratec, Yc).By X chromaticity coordinates close to first object color dot value XcIn the case where
Allow three primary colors initial value (R0, G0, B0) also in three primary colors limits value (Rmax, Gmax, Bmax) in；By changing R simultaneously0、G0And B0
Value, by the second aim colour point value YcClose to the Y with reference to color dotTIn the case where first object color dot value XcIt can also be close to reference
The X of color dotTAnd allow three primary colors initial value (R0, G0, B0) also in three primary colors limits value (Rmax, Gmax, Bmax) in.Above-mentioned side
Method obtains more true target color point (Xc, Yc), white balance test effect is good, will not because of liquid crystal product model change and
Lead to target color point (Xc, Yc) inaccuracy.
Detailed description of the invention
Fig. 1 is the non-linear relation schematic diagram between R gain and the X chromaticity coordinates in an embodiment of the present invention；
Fig. 2 is the non-linear relation schematic diagram of the G gain and X chromaticity coordinates and Y chromaticity coordinates in an embodiment of the present invention；
Fig. 3 is the non-linear relation schematic diagram of the B gain and X chromaticity coordinates and Y chromaticity coordinates in an embodiment of the present invention；
Fig. 4 is the flow diagram of the LCD TV white balance test method in an embodiment of the present invention；
Fig. 5 is to seek three primary colors limits value (R in an embodiment of the present inventionmax, Gmax, Bmax) flow diagram；
Fig. 6 is the idiographic flow schematic diagram of the LCD TV white balance test method in an embodiment of the present invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant listed item.
Three primary colors, colored TV use primaries mode, and also known as RGB color model is a kind of additive color model, will be red
(R), green (G) is added in different proportions with blue (B) trichromatic coloured light, is also easy to produce diversified coloured light；
White balance, i.e. white balance are the one of (R) red in display, green (G) and blue (B) mixture manufacturing white precision
Item index.The color and our colors visually seen that TV is exported under reset condition are inconsistent, it is desirable to color is normal, just firstly the need of
The keynote of color is controlled by white balance, TV is that white balance control is realized by the gain and compensation of R, G and B；
Colour temperature, be characterize the photochromic scale of light source, if the color (i.e. photochromic, also known as chromaticity) of a source emissioning light with
The color of black body emission light at a certain temperature is identical, then the kelvin rating of the black matrix is just called the colour temperature of the light source,
Abbreviation colour temperature, the control of white balance are exactly the monitoring to colour temperature in fact；
X chromaticity coordinates, i.e., the X color dot tested out by CA310 (color analysis instrument)；
Y chromaticity coordinates, i.e., the Y color dot tested out by CA310 (color analysis instrument)；
Lv: the light emission luminance of liquid crystal display is tested out by CA310 (color analysis instrument)；
R gain, the red gain inside three primary colors；
G gain, the green gain inside three primary colors；
B gain, the blue gain inside three primary colors；
R gain saturation value adjusts the value energy useful effect of R gain in the limit of X chromaticity coordinates, Y chromaticity coordinates and Lv brightness
Maximum value；
G gain saturation value adjusts the value energy useful effect of R gain in the limit of X chromaticity coordinates, Y chromaticity coordinates and Lv brightness
Maximum value；
B gain saturation value adjusts the value energy useful effect of R gain in the limit of X chromaticity coordinates, Y chromaticity coordinates and Lv brightness
Maximum value.
Non-linear relation schematic diagram between R gain and X chromaticity coordinates as shown in Figure 1, from Fig. 1 it will be seen that
RmaxFor the saturation value of R gain, in section [0, Rmax] between, X chromaticity coordinates and R gain are in nonlinear positive correlation, work as R
Gain is more than or equal to RmaxLater, R gain is due to being saturated, and X chromaticity coordinates does not change in the variation with R gain, also
I.e. the increase of R gain does not have an impact X chromaticity coordinates；
It is illustrated in figure 2 the non-linear relation schematic diagram of G gain Yu Y chromaticity coordinates and Lv lightness dimension, we can from Fig. 2
To find out, GmaxFor the saturation value of G gain, in section [0, Gmax] between, Y chromaticity coordinates and Lv lightness dimension respectively with G gain
In nonlinear positive correlation, when G gain is more than or equal to GmaxLater, G gain is due to saturation, Y chromaticity coordinates and Lv
Lightness dimension does not change in the variation with R gain, that is, the increase of G gain does not produce Y chromaticity coordinates and Lv lightness dimension
It is raw to influence；
It is illustrated in figure 3 the non-linear relation schematic diagram of B gain Yu X chromaticity coordinates and Y chromaticity coordinates, we can be with from Fig. 3
Find out, BmaxFor the saturation value of B gain, in section [0, Bmax] between, X chromaticity coordinates and the Y color left side are respectively with B gain in non-
Linear negative correlativing relation, when B gain is more than or equal to BmaxLater, B gain is due to saturation, X chromaticity coordinates and Y chromaticity coordinates
Do not change in the variation with B gain, that is, the increase of B gain does not have an impact X chromaticity coordinates and Y chromaticity coordinates；
By Fig. 1, Fig. 2 and Fig. 3 it is known that R gain mainly influences X chromaticity coordinates；G gain mainly influence Y chromaticity coordinates and
Lv lightness dimension；B gain mainly influences X chromaticity coordinates and Y chromaticity coordinates, and X chromaticity coordinates is simultaneously by both R gain and B gain
Joint effect, wherein R gain and the positive nonlinear correlation of X chromaticity coordinates, B gain and X chromaticity coordinates negative nonlinear correlation, G
Gain and the positive nonlinear correlation of Y chromaticity coordinates, B gain and Y chromaticity coordinates negative linear correlation.
Referring to Fig. 4, LCD TV white balance test method includes the following steps:
Step S100 sets the three primary colors limits value (R of liquid crystal displaymax, Gmax, Bmax), setting refers to color dot (XT,
YT), set allowable error value (Xe, Ye)；
Step S200 obtains the three primary colors initial value (R of liquid crystal display0, G0, B0), obtain current color dot (X0, Y0)；
Step S300, for B0The first debugging step-length b is chosen, liquid crystal display is calculated according to following first function relationship
First debugging value B of screenc, Bc=B0+ ab, a=a+1, wherein a is constant, and by the first debugging value BcIt is input to liquid crystal
In display screen, and corresponding acquisition first color dot debugging value Xc；
Step S400 is calculated the first three primary colors according to following second function relationship and terminates debugging judgment value Bd, Bd=
Bmax-Bc, first color dot is calculated according to following third functional relation and terminates debugging judgment value Xd=| Xc-XT|, if full simultaneously
Sufficient Xd≤XeAnd BdFor positive number, then X is definedcFor first object color dot value；Otherwise, S300 is returned to step；
Step S500, for G0The second debugging step-length d is chosen, acquisition liquid crystal is calculated according to following 4th functional relation
Second debugging value G of display screenc, Gc=G0+ cd, c=c+1, wherein c is constant, and by the second debugging value GcIt is input to liquid
In crystal display screen, and the second color dot debugging value Y of corresponding acquisitionc；
Step S600 is calculated the second three primary colors according to following 5th functional relation and terminates debugging judgment value Gd, Gd=
Gmax-Gc, the second color dot is calculated according to following 6th functional relation and terminates debugging judgment value Yd, Yd=| Yc-YT|, if simultaneously
Meet Yd≤YeAnd GdFor positive number, then Y is definedcFor the second aim colour point value；Otherwise, S500 is returned to step；
Step S700 exports target color point (Xc, Yc), according to the target color point (Xc, Yc) debug the white flat of LCD TV
Weighing apparatus.
Further, in one embodiment, in the step S100, the three primary colors limits value (Rmax, Gmax,
Bmax) setting operation specifically comprise the following steps:
Three primary colors initial value (the R of liquid crystal display is obtained in real timei, Gi, Bi), and current color dot (X is acquired in real timei, Yi)；
Obtain RiValue and color dot value XiNon-linear relation starting point, be defined as (Rmax, Xmax)；Obtain GiValue and color dot
Value YiNon-linear relation starting point, be defined as (Gmax, Ymax)；
Obtain BiValue and color dot value YiNon-linear relation starting point, be defined as (Bmax, Ymax)。
Further, in one embodiment, in the step S200, the three primary colors limits value of the liquid crystal display
(Rmax, Gmax, Bmax) with obtain liquid crystal display three primary colors initial value (R0, G0, B0) meet following relationship:
Rmax≥R0, Gmax≥G0, Bmax≥B0。
Further, in one embodiment, in step S300, the first debugging step-length b is positive number.
The concrete operating principle of LCD TV white balance test method is described in detail below:
Please together combine refering to fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, set the three primary colors limits value of liquid crystal display
(Rmax, Gmax, Bmax), in the three primary colors limits value (R for obtaining liquid crystal displaymax, Gmax, Bmax), liquid crystal display is obtained in real time
Three primary colors initial value (Ri, Gi, Bi), and current color dot (X is acquired in real timei, Yi).For ease of description, in one embodiment,
Three primary colors limits value (Rmax, Gmax, Bmax)=(10,10,10)；With reference to color dot (Xi, Yi)=(3,13)；Allowable error value (Xe,
Ye)=(0.5,0.5)；Three primary colors initial value (R0, G0, B0)=(8,8,8)；Current color dot (5,5)；First debugging step-length b=
2,；Second debugging step-length d=2.
It referring to Fig. 1 and Fig. 5, has been obtained in Fig. 1, R gain influences X chromaticity coordinates, in section [0, Rmax] it
Between, X chromaticity coordinates and R gain are in nonlinear positive correlation, when R gain is more than or equal to RmaxLater, R gain by
In saturation, X chromaticity coordinates does not change in the variation with R gain.Therefore, when needing to obtain RiValue and color dot value XiIt is non-linear
When the starting point of relationship, by RiAccording to the first default variation length k1Increase or reduce, obtains current R at this timeiX under valuei,
If XiValue with RiValue variation and change, then current RiValue obtain saturation value not yet, repeat the above process, until
XiValue will not be with RiValue variation and change, then current RiValue be R gain saturation value, by R at this timeiIt is defined as
Rmax；
Similarly, it referring to Fig. 2 and Fig. 5, having been obtained in Fig. 2, G gain influences Y chromaticity coordinates and Lv lightness dimension,
G is found using the variation relation of G gain and Y chromaticity coordinatesmax, therefore, when needing to obtain GiValue and color dot value YiNonlinear dependence
When the starting point of system, by GiAccording to the second default variation length k2Increase or reduce, obtains current G at this timeiY under valueiIf
If YiValue with GiValue variation and change, then current GiValue obtain saturation value not yet, repeat the above process, until Yi
Value will not be with GiValue variation and change, then current GiValue be G gain saturation value, by G at this timeiIt is defined as
Gmax；
Similarly, it referring to Fig. 3 and Fig. 5, has been obtained in Fig. 3, B gain influences X chromaticity coordinates and Y chromaticity coordinates, benefit
B is found with the variation relation of B gain and Y chromaticity coordinatesmax, therefore, when needing to obtain BiValue and color dot value YiNon-linear relation
When starting point, by BiVariation length k is preset according to third3Increase or reduce, obtains current B at this timeiY under valueiIf Yi's
Value is with BiValue variation and change, then current BiValue obtain saturation value not yet, repeat the above process, until YiValue not
It can be with BiValue variation and change, then current BiValue be B gain saturation value, by B at this timeiIt is defined as Bmax；
Finally, obtained three primary colors limits value (Rmax, Gmax, Bmax)=(10,10,10)；
It should be noted that in one embodiment, the default variation length k of described above first1, the second default variation
Length k2Variation length k is preset with third3It is 1, it is of course possible to be needed in conjunction with actual test, flexibly setting first is default becomes
Change length k1, the second default variation length k2Variation length k is preset with third3Size, for example, the first default variation length k1、
Second default variation length k2Variation length k is preset with third3It is 2；For another example, the first default variation length k1=1, second is pre-
If variation length k2=2, third presets variation length k3=3.Preset length kiSize selection it is smaller, so that it may it is closer
True trichromatic saturation value；
It should also be noted that, client can be combined with actual test needs, needed for actual liquid crystal display,
Client oneself sets a three primary colors limits value (Rmax, Gmax, Bmax), it is not absolutely required to according to X chromaticity coordinates and Y chromaticity coordinates and R
The non-linear relation of gain, G gain and B gain obtain three primary colors limits value (Rmax, Gmax, Bmax)；
Obtain three primary colors initial value (R0, G0, B0)=(8,8,8), and obtain current color dot (X0, Y0)=(5,5)；
Since X chromaticity coordinates is the influence by R gain and B gain simultaneously, in order to enable X chromaticity coordinates is close
With reference to X chromaticity coordinates XT, that is, meet Xd≤Xe, enable three primary colors initial value (R0, G0, B0) in R0=Rmax, so that when first three is former
Color initial value (R0, G0, B0)=(10,8,8), pass through circulation change BcTo obtain first object color dot value Xc, referring to figure
6, for B0The first debugging step-length b is chosen, the first debugging value B of liquid crystal display is calculated according to first function relationshipc=B0
+ ab, a=a+1, in the present embodiment, b are chosen for 2, therefore, in B0After increasing by one first debugging step-length, current three is former
Color initial value (R0, G0, B0)=(10,8,10), corresponding first object color dot value Xc=4, Xd=| Xc-XT|=1, current XdNo
Meet Xd≤Xe, repeat the above process until three primary colors initial value (R at this time0, G0, B0)=(10,8,12), corresponding first mesh
Mark color dot value Xc=3, Xd=| Xc-XT|=0, current XdMeet Xd≤Xe, determine to meet condition, obtain first object color dot at this time
Value Xc=3, however, due to current three primary colors initial value (R0, G0, B0)=(10,8,12) in B0> Bmax, therefore, in order to guarantee
First object color dot value XcIn the case where=3, B0≯Bmax, and because first object color dot value XcAlso influenced by R gain,
At this point it is possible to pass through while changing R0And B0By current three primary colors initial value (R0, G0, B0) control in three primary colors limits value
(Rmax, Gmax, Bmax) in range, concrete operations are as follows, by current three primary colors initial value (R0, G0, B0)=(10,8,12) in
R0Reduce the first debugging step-length b, by B0Reduce first debugging step-length b, due to R gain and first object color dot value XcIt is non-linear
It is positively correlated, B gain and first object color dot value XcNon-linear negative correlation, so that first object color dot value XcIt can keep original
Value, too big offset does not occur, while again by current three primary colors initial value (R0, G0, B0)=(8,8,10), it is maintained at three originals
Color limits value (Rmax, Gmax, Bmax)=(10,10,10) in, X at this timecNote is first object color dot value Xc；
It should be noted that obtaining first object color dot value Xc=3, but current three primary colors initial value (R0, G0, B0)
=(10,8,12) exceed three primary colors limits value (Rmax, Gmax, Bmax) in range when, need to change R simultaneously0And B0Common limitation the
One aim colour point value XcVariation, work as R0And B0Reducing first debugging step-length b simultaneously still can not be initial by current three primary colors
It is worth (R0, G0, B0) it is limited in three primary colors limits value (Rmax, Gmax, Bmax) in range when, continue current R0And B0Reduce the simultaneously
One debugging step-length b is until by three primary colors initial value (R0, G0, B0) it is limited in three primary colors limits value (Rmax, Gmax, Bmax) range
It is interior.
Then, the second aim colour point value Y is obtained using G gain and B gainc, referring to Fig. 6, similarly, at this time when
Before (R0, G0, B0)=(8,10,8), for G0The second debugging step-length d is chosen, for G0The first debugging step-length d is chosen, according to the 4th
The second debugging value G of liquid crystal display is calculated in functional relationc=G0+ cd, c=c+1, in the present embodiment, d are chosen for
2, therefore, in G0After increasing by the second debugging step-length, current three primary colors initial value (R0, G0, B0)=(8,10,10), corresponding
Two aim colour point value Yc=9, Yd=| Yc-YT|=4, current YdIt is unsatisfactory for Yd≤Ye, repeat the above process three originals until at this time
Color initial value (R0, G0, B0)=(8,12,10), corresponding second aim colour point value Yc=13, current YdMeet Yd≤Ye, determine
Meet condition, obtains the second aim colour point value Y at this timec=13, however, due to current three primary colors initial value (R0, G0, B0)=
G in (8,12,10)0> Gmax, however, due to current three primary colors initial value (R0, G0, B0)=(8,12,10) in G0> Gmax, because
This, in the case where guaranteeing the second aim colour point value Y=13, G0≯Gmax, and because the second aim colour point value YcAlso by R
The influence of gain, at this point it is possible to pass through while changing G0And B0By current three primary colors initial value (R0, G0, B0) it is no more than three originals
Color limits value (Rmax, Gmax, Bmax), but because of B0Variation first object color dot value XcAlso it will receive influence (nonlinear negative
Close), it therefore, can be by changing R simultaneously0、G0And B0By current three primary colors initial value (R0, G0, B0) it is no more than three primary colors limit
Value (R processedmax, Gmax, Bmax), concrete operations are as follows, by current three primary colors initial value (R0, G0, B0)=(8,12,10) in
R0Reduce the second debugging step-length d, by G0Reduce second step-length d, by B0Reduce second debugging step-length d, due to R gain and
Two aim colour point value YcPositively nonlinear correlation, G gain and the second aim colour point value YcPositively nonlinear correlation, B gain is respectively with
One aim colour point value XcWith the second aim colour point value YcNon-linear negative correlation, so that the second aim colour point value YcIt can keep original
Value in the case where, first object color dot value XcToo big offset does not occur equally, while again by current three primary colors initial value
(R0, G0, B0)=(6,10,8), it is maintained at three primary colors limits value (Rmax, Gmax, Bmax)=(10,10,10) in, Y at this timec
Note is the second aim colour point value Yc；
It should be noted that obtaining the second aim colour point value Yc=13, but current three primary colors initial value (R0, G0,
B0)=(8,12,10) exceed three primary colors limits value (Rmax, Gmax, Bmax) in range when, need to change R simultaneously0、G0And B0Jointly
Limit the second aim colour point value YcVariation, work as R0、G0And B0Reducing second debugging step-length d simultaneously still can not will be current
Three primary colors initial value (R0, G0, B0) it is limited in three primary colors limits value (Rmax, Gmax, Bmax) in range when, continue current R0、G0With
B0Reduce second debugging step-length d simultaneously until by three primary colors initial value (R0, G0, B0) it is limited in three primary colors limits value (Rmax,
Gmax, Bmax) in range.
Finally, current first object color dot value Xc=the 3 and second aim colour point value Yc=13 be target color point (Xc, Yc)
=(3,13).
It should be noted that further, in one embodiment, it is contemplated that R gain, G gain and B gain and X
The influence of chromaticity coordinates, Y chromaticity coordinates and Lv lightness dimension, therefore obtaining first object color dot value XcWith the second aim colour point value Yc
Afterwards, it is also necessary to further to first object color dot value XcWith the second aim colour point value YcWhether X is metd≤XeAnd Yd≤YeThis
Condition exports target color point (X if still meetingc, Yc)=(3,13)；Otherwise, it returns and re-execute the steps S300.
It should be noted that the above method is according to the positively nonlinear correlation relationship of R gain and X chromaticity coordinates, G gain
It is related with the non-linear negative correlation of X chromaticity coordinates and Y chromaticity coordinates respectively to the positively nonlinear correlation relationship of Y chromaticity coordinates and B gain
To obtain target color point (X the most accuratec, Yc).I.e. by changing R simultaneously0And B0Value (while increase the first debugging step
Long b reduces the first debugging step-length b) simultaneously, by X chromaticity coordinates close to first object color dot value XcIn the case where allow three primary colors
Initial value (R0, G0, B0) also in three primary colors limits value (Rmax, Gmax, Bmax) in；By changing R simultaneously0、G0And B0Value it is (same
Shi Zengjia second debugs step-length d or reduces the second debugging step-length d) simultaneously, by the second aim colour point value YcClose to reference to color dot
YTIn the case where first object color dot value XcIt can also be close to the X with reference to color dotTAnd allow three primary colors initial value (R0, G0, B0)
Also in three primary colors limits value (Rmax, Gmax, Bmax) in.
It should be noted that the first object color dot value X finally obtainedcAs target color point (Xc, Yc) XcValue, second
Aim colour point value is target color point (Xc, Yc) YcValue
It should be noted that enabling three primary colors initial value (R0, G0, B0) in R0=RmaxWhen, it is contemplated that white balance test
Use saturation value to be debugged as limits value off field 100% brightness is white, can allow liquid crystal display image quality high highlights
Divide is not in the case where avoiding colour cast on the supersaturation of color rifle and the hungry rank of the highlighted ash of image quality, therefore, to start to enable three primary colors initial
It is worth (R0, G0, B0) in R0=RmaxThe generation that can be very good to prevent above situation, so that white balance test effect is more preferably.
It should be noted that obtaining target color point (Xc, Yc) after, client can according to actual needs, by target color point
(Xc, Yc), corresponding target color point (Xc, Yc) under three primary colors target value (RT, GT, BT), color temperature value and Lv brightness value.
LCD TV white balance test method of the invention, according to the positively nonlinear correlation relationship of R gain and X chromaticity coordinates,
The positively nonlinear correlation relationship and B gain of G gain and Y chromaticity coordinates are born with X chromaticity coordinates and the non-linear of Y chromaticity coordinates respectively
It is related to obtain target color point (X the most accuratec, Yc).By X chromaticity coordinates close to first object color dot value XcIn the case where
Allow three primary colors initial value (R0, G0, B0) also in three primary colors limits value (Rmax, Gmax, Bmax) in；By changing R simultaneously0、G0And B0
Value, by the second aim colour point value YcClose to the Y with reference to color dotTIn the case where first object color dot value XcIt can also be close to reference
The X of color dotTAnd allow three primary colors initial value (R0, G0, B0) also in three primary colors limits value (Rmax, Gmax, Bmax) in.Above-mentioned side
Method obtains more true target color point (Xc, Yc), white balance test effect is good, will not because of liquid crystal product model change and
Lead to target color point (Xc, Yc) inaccuracy.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (4)
1. a kind of LCD TV white balance test method, which comprises the steps of:
Step S100 sets the three primary colors limits value (R of liquid crystal displaymax, Gmax, Bmax), setting refers to color dot (XT, YT), if
Determine allowable error value (Xe, Ye)；
Step S200 obtains the three primary colors initial value (R of liquid crystal display0, G0, B0), obtain current color dot (X0, Y0)；
Step S300, for B0The first debugging step-length b is chosen, liquid crystal display is calculated according to following first function relationship
First debugging value Bc, Bc=B0+ ab, a=a+1, wherein a is constant, and by the first debugging value BcIt is input to liquid crystal display
In, and corresponding acquisition first color dot debugging value Xc；
Step S400 is calculated the first three primary colors according to following second function relationship and terminates debugging judgment value Bd, Bd=Bmax-
Bc, first color dot is calculated according to following third functional relation and terminates debugging judgment value Xd=| Xc-XT|, if meeting X simultaneouslyd≤
XeAnd BdFor positive number, then X is definedcFor first object color dot value；Otherwise, S300 is returned to step；
Step S500, for G0The second debugging step-length d is chosen, acquisition liquid crystal display is calculated according to following 4th functional relation
Second debugging value G of screenc, Gc=G0+ cd, c=c+1, wherein c is constant, and by the second debugging value GcIt is input to liquid crystal
In display screen, and the second color dot debugging value Y of corresponding acquisitionc；
Step S600 is calculated the second three primary colors according to following 5th functional relation and terminates debugging judgment value Gd, Gd=Gmax-
Gc, the second color dot is calculated according to following 6th functional relation and terminates debugging judgment value Yd, Yd=| Yc-YT|, if meeting simultaneously
Yd≤YeAnd GdFor positive number, then Y is definedcFor the second aim colour point value；Otherwise, S500 is returned to step；
Step S700 exports target color point (Xc, Yc), according to the target color point (Xc, Yc) debugging LCD TV white balance.
2. LCD TV white balance test method according to claim 1, which is characterized in that in the step S100,
Three primary colors limits value (the Rmax, Gmax, Bmax) setting operation specifically comprise the following steps:
Three primary colors initial value (the R of liquid crystal display is obtained in real timei, Gi, Bi), and current color dot (X is acquired in real timei, Yi)；
Obtain RiValue and color dot value XiNon-linear relation starting point, be defined as (Rmax, Xmax)；Obtain GiValue and color dot value Yi's
The starting point of non-linear relation, is defined as (Gmax, Ymax)；
Obtain BiValue and color dot value YiNon-linear relation starting point, be defined as (Bmax, Ymax)。
3. LCD TV white balance test method according to claim 2, which is characterized in that in the step S200,
Three primary colors limits value (the R of the liquid crystal displaymax, Gmax, Bmax) with obtain liquid crystal display three primary colors initial value (R0, G0,
B0) meet following relationship:
Rmax≥R0, Gmax≥G0, Bmax≥B0。
4. LCD TV white balance test method according to claim 3, which is characterized in that described in step S300
First debugging step-length b is positive number.
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