CN104581148B - Method for measuring 3D crosstalk values of liquid crystal display - Google Patents
Method for measuring 3D crosstalk values of liquid crystal display Download PDFInfo
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Abstract
The invention relates to a method for measuring signal parameters of a liquid crystal display, in particular to a method for measuring the image crosstalk values of the liquid crystal display, especially the crosstalk values of images in the 3D technology. The liquid crystal display is evenly divided into n regions, wherein n is larger than or equal to 2; black images and white images are alternately displayed on the liquid crystal display at preset display frequency through graphic cards; 3D filtering devices with the same display frequency are aligned with the centers of different regions respectively, and the 3D filtering devices are synchronous with the display frequency of the liquid crystal display; the filtering devices measure brightness values of the black images and the white images which are received through the filtering devices and alternately displayed in different regions through optical detection devices respectively, and the crosstalk value of each region is calculated through the measured brightness values; the average value and/or the maximum value of all the crosstalk values are/is further calculated and compared with preset threshold values. Thus, the method for measuring the 3D crosstalk values is easy and convenient to carry out, low in cost and accurate in measurement result.
Description
The application is invention entitled " a kind of 3d crosstalk value measurement method of liquid crystal display screen " that on May 31st, 2011 proposes
The divisional application of Chinese invention patent application 201110143593.3.
Technical field
The present invention relates to a kind of method that signal parameter to liquid crystal display screen measures, specifically refer to one kind and be used for liquid crystal display screen
Picture crosstalk value, especially realize the measuring method of the crossfire value of image in 3d technology.
Background technology
With the progress of information technology, the liquid crystal TV set possessing 3d technology is increasingly universal.As the liquid realizing 3d technology
The most important part of brilliant television set, the parameters of 3d liquid crystal display screen can not be ignored, and the crossfire value of liquid crystal display screen is liquid crystal
The distinctive performance indications of display have obtained extensive concern and have inquired into.Crosstalk in realizing 3d technology is due to left and right
Eye pattern, as the detached dual edge phenomenon not exclusively causing, generally speaking may be defined as in the image watched it is undesirable to see
To part (separated by image and not exclusively cause) brightness ratio with the part wishing to:
crosstalk=l(incorrect)/l(correct)；
In terms of crosstalk test, research thinks that images of left and right eyes cross interference index is just used to weigh right and left eyes cross interference
Degree, if the measured crosstalk realized in 3d technology is too big, do the liquid crystal of 3d LCD TV with such liquid crystal display screen
Screen arises that smear, has a strong impact on the effect of realizing of 3d technology, therefore before selecting liquid crystal display screen, the 3d skill of actual measurement screen
Crosstalk in art is very necessary.
Content of the invention
Based on the requirement of above-mentioned prior art, the goal of the invention of the present invention is to provide one kind to realize simple and convenient, cost
Low, the measuring method of measurement result accurate 3d crossfire value.
In order to realize above-mentioned goal of the invention, the present invention adopts the following technical scheme that:
A kind of 3d crosstalk value measurement method of liquid crystal display screen, this measuring method specifically includes following steps:
(1) liquid crystal display screen is evenly dividing as n region, wherein n >=2；
(2) adopt 3d to show graph card on liquid crystal display screen, black, white image are alternately shown with default display frequency；
(3) it is respectively aligned to having in zones of different with the 3d filter plant of identical default display frequency in step (2)
At the heart, the described display frequency of 3d filter plant is synchronous with the default display frequency of described liquid crystal display screen；
(4) optical detection equipment is used by described filter plant, measurement respectively is received by described filter plant
Zones of different is replaced with black, the white image brightness value of display, calculates the crossfire value in each region by the brightness value recording；
(5) calculate the meansigma methodss of crossfire value and/or maximum in n region, and be compared with default threshold values.
Specifically, the 3d filter plant adopting in step (3) is shutter 3d glasses, and this shutter 3d glasses have
Two image display channels being alternately opened and closed, it is identical with the default display frequency of described liquid crystal display screen and same that it is alternately opened and closed frequency
Step.
And pass through shutter 3d glasses further and obtain black, the brightness value of white image replacing display, comprising:
When described image display channel all obtains white image, the left side of corresponding described shutter 3d glasses respectively
The brightness value that display channel and right side display channel record is l (ww), r (ww)；
When described shutter 3d glasses left-side images display channel obtains white image, image right display channel obtains
During black image, correspond to the brightness value that the described left side display channel of shutter 3d glasses and right side display channel record respectively
For l (wb), r (wb)；
When described shutter 3d glasses left-side images display channel obtains black image, image right display channel obtains
During white image, correspond to the brightness value that the described left side display channel of shutter 3d glasses and right side display channel record respectively
For l (bw), r (bw)；
When described image display channel all obtains black image, the left side of corresponding described shutter 3d glasses respectively
The brightness value that display channel and right side display channel record is l (bb), r (bb).
But can not be directly used in the size of explanation 3d crosstalk by measuring the result that obtains, described each region
The white field crosstalk value calculating method that corresponding described shutter 3d glasses left-side images display channel receives white image is:
crosstalk(l)=(l(ww)-l(wb))/(l(ww)-l(bb))；
The corresponding described shutter 3d glasses image right display channel in each described region receives the white of white image
Field crosstalk value calculating method is:
crosstalk(r)=(r(ww)-r(wb))/(r(ww)-r(bb)).
The corresponding described shutter 3d glasses left-side images display channel in described each region receive black image due to
Crosstalk and the black field brightness value that produces is l (bw): the corresponding described shutter 3d glasses image right in each described region shows
Show that the black field brightness that channel reception black image is produced due to crosstalk is r (wb), described black field brightness value is different from above-mentioned
White brightness value, its can directly as weigh crossfire value size standard use, or can be described as black field brightness value ×
100% acquisition crossfire value.
Further, all areas are calculated after the crossfire value of the same type in n region being weighted averagely
The meansigma methodss of dissimilar crossfire value in domain and/or maximum, and by described meansigma methodss and/or maximum and default threshold values
It is compared.Corresponding different types of crossfire value should preset different threshold values respectively, described dissimilar crossfire value average
Value and/or maximum are compared with corresponding default threshold values respectively, when meansigma methodss and/or the maximum of described dissimilar crossfire value
When value is no more than corresponding default threshold values, described liquid crystal display screen is suitable for adopting 3d technology；Conversely, described liquid crystal display screen is not suitable for
Using 3d technology.It is preferable that crossfire value default meansigma methodss threshold values in corresponding white field is 12% under conditions of accumulating through overtesting,
Maximum threshold values is 15%；Corresponding black brightness value default meansigma methodss threshold values is 1.8, and maximum is 2.5.
In addition it is further preferred that the zoned format pair using matrix is evenly dividing to the liquid crystal display screen in the present invention
Liquid crystal display screen carries out region division, and different regions is of similar shape and area.
The region that described liquid crystal display screen divides has identical columns and rows, the areal n=m of division2, wherein m is nature
Number.
It is further to note that due to of the present invention be 3d technology show graph card in image it should be ensured that
Ensure the seriality of visual effect during alternately display black, white image, individually show black image or white
The frequency of image show the guarantee successional frequency values of image visual effect under the conditions of being not less than 2d it is preferable that described liquid crystal
The display frequency of the default display frequency of screen and 3d filter plant is all higher than, equal to 100hz, being more preferably greater than equal to
120hz.
By using above-mentioned technical scheme, the invention provides one kind realizes simple and convenient, low cost, measurement result is accurate
The measuring method of true 3d crossfire value.
Brief description
It is shown that embodiment liquid crystal display screen being evenly dividing for 9 regions that the present invention adopts in Fig. 1；
It is shown that in Fig. 2 to adopt 3d graph card to show the schematic diagram of full white image in liquid crystal display screen；
It is shown that in Fig. 3 to adopt 3d graph card display left side to be the schematic diagram for black image for the white right side in liquid crystal display screen；
It is shown that in Fig. 4 to adopt 3d graph card display right side to be the schematic diagram of black image for white left in liquid crystal display screen；
It is shown that in Fig. 5 to adopt 3d graph card to show the schematic diagram of all black picture in liquid crystal display screen.
Specific embodiment
The invention reside in providing one kind to realize simple and convenient, low cost, the measurement side of measurement result accurate 3d crossfire value
Method.It is described in detail with reference to the specific embodiment in the specific embodiment to the present invention for the Figure of description.
It is shown that first the object measured by the present invention to be divided into different measured zone it is ensured that a fixed number in Fig. 1
The more accurately 3d crosstalk of whole liquid crystal display screen can be obtained after the 3d crossfire value that the measured zone of amount measures zones of different respectively
Value.Generally, when carrying out the measuring method of the present invention it should liquid crystal display screen is uniformly divided at least two regions, and
The zoned format preferably employing matrix carries out region division to liquid crystal display screen, and different regions is of similar shape and area.
The region that simultaneously more electedly described liquid crystal display screen divides has identical columns and rows, the areal n=that liquid crystal display screen is divided
m2, wherein m is natural number.
Specific to the specific embodiment of the present invention of display in Fig. 1, liquid crystal display screen is specifically divided into 9 regions by the present invention,
This 9 regions are of similar shape and area on liquid crystal display screen, and they become matrix form to arrange on liquid crystal display screen simultaneously, longitudinally
There are 3 rows, laterally there are 3 row.
By in above-described embodiment explanation region division, the present invention using as in Fig. 2-5 in liquid crystal display screen shown in figure
Card measures to the 3d crossfire value of zones of different in liquid crystal display screen, and the part that Fig. 2-5 therein includes oblique line is black image
Part.So, generally the method includes:
A kind of 3d crosstalk value measurement method of liquid crystal display screen, this measuring method specifically includes following steps:
(1) liquid crystal display screen is evenly dividing as 9 regions；
(2) adopt 3d to show graph card on liquid crystal display screen, black, white image are alternately shown with default display frequency；
(3) it is respectively aligned to having in zones of different with the 3d filter plant of identical default display frequency in step (2)
At the heart, the described display frequency of 3d filter plant is synchronous with the default display frequency of described liquid crystal display screen；
(4) optical detection equipment is used by described filter plant, measurement respectively is received by described filter plant
Zones of different is replaced with black, the white image brightness value of display, is directly obtained by the brightness value recording or calculate each
The crossfire value in region；
(5) calculate the meansigma methodss of crossfire value and/or maximum in n region, and be compared with default threshold values.
More specifically, by above-mentioned technical scheme, the present invention is using the brightness of the graph card measurement screen as Fig. 2-5.?
In the state of liquid crystal display screen adopts 3d technology, graph card is divided into left and right two width images, logical by showing on the left of described filter plant
What road obtained is the image on the simply left side, and stretches the image on the whole left side when display；By described filter plant
What right side display channel obtained is the image on the right, and the same image stretching whole the right when display.Liquid crystal display screen exists
Using in the state of 3d technology, left and right image is alternately shown, then now passed through by described optical detection device measuring
The brightness value of the display channel of filter plant arranged on left and right sides.Specifically illustrate further, graph card is divided taking the graph card in Fig. 3 as a example
Become left and right two width images, on the left of filter plant, display channel should obtain the hololeucocratic image in the left side, show on the right side of filter plant
Passage should obtain the holomelanocratic image in the right, be white image now by the acquisition of left side display channel, shown by right side
Show that passage obtains for black image, shown through left side by optical detection device measuring in the case of perfect condition no crosstalk
The brightness value of passage should be 60, and the brightness value through right side display channel should be 0.But in practical situation, because crosstalk is total
It is to exist, is therefore less than 60 by the brightness value of left side display channel, be more than 0 by the brightness value of right side display channel.
And in the measurement process stated in realization, the 3d filter plant that the present invention adopts is shutter 3d glasses, this shutter
Formula 3d glasses have two image display channels being alternately opened and closed, and it is alternately opened and closed the default display of frequency and described liquid crystal display screen
Frequency is identical and synchronous.This makes it possible to obtain, by the left and right display channel of this shutter 3d glasses, the figure alternately showing respectively
Black in card, white image.
Obtain black, the brightness value of white image replacing display by shutter 3d glasses, comprising:
When described image display channel all obtains white image, the left side of corresponding described shutter 3d glasses respectively
The brightness value that display channel and right side display channel record is l (ww), r (ww)；
When described shutter 3d glasses left-side images display channel obtains white image, image right display channel obtains
During black image, correspond to the brightness value that the described left side display channel of shutter 3d glasses and right side display channel record respectively
For l (wb), r (wb)；
When described shutter 3d glasses left-side images display channel obtains black image, image right display channel obtains
During white image, correspond to the brightness value that the described left side display channel of shutter 3d glasses and right side display channel record respectively
For l (bw), r (bw)；
When described image display channel all obtains black image, the left side of corresponding described shutter 3d glasses respectively
The brightness value that display channel and right side display channel record is l (bb), r (bb).
It is divided into left-side images display channel and the right side by the measurement result of the measuring method using the above-mentioned present invention
Side image display channel measures 9 groups of data of acquisition respectively to model machine, and wherein w represents white image, and b represents black figure
Picture, thus obtained list of data values is as shown in table 1 below:
Table 1
But above-mentioned measurement result finally can not intuitively show the size of the 3d crossfire value of liquid crystal display screen, so also needing
Want computing formula for further processing to this above-mentioned measurement result.Described in each specifically, described region is corresponding
The white field crosstalk value calculating method that shutter 3d glasses left-side images display channel receives white image is:
crosstalk(l)=(l(ww)-l(wb))/(l(ww)-l(bb))；
The corresponding described shutter 3d glasses image right display channel in each described region receives the white of white image
Field crosstalk value calculating method is:
crosstalk(r)=(r(ww)-r(wb))/(r(ww)-r(bb)).
For example, according in the left-side images display channel in table 1, crosstalk is calculated to the p1 data instance in subregion
L the numerical value of (), wherein l (ww)=55, l (wb)=48, l (bb)=0.01, corresponding for these data above-mentioned substitution is calculated
Obtain crosstalk (l)=(55-48)/(55-0.01)=0.127296 in the formula of crosstalk (l), so pass through above-mentioned
Being calculated corresponding subregion in data left-side images display channel is the white field crossfire value 0.127296 of p1.By that analogy, pass through
It is calculated the white field by passing through corresponding different subregions in left-side images display channel and image right display channel respectively
The concrete numerical value size of crossfire value.
But, receive black for the corresponding described shutter 3d glasses left-side images display channel in each described region
The black field brightness value of image can directly be identified by l (bw): on the right side of the corresponding described shutter 3d glasses in each described region
The black field brightness value that image display channel receives black image directly can be identified by r (wb), and they all can be in order to directly to weigh
Amount crossfire value size uses.
For example, according in the left-side images display channel in table 1 to the p1 data in subregion, wherein l (bw)=1.6, therefore
Just using this concrete numerical value as the black field crossfire value 1.6 representing corresponding subregion p1 in left-side images display channel.By that analogy, lead to
Cross such method to determine respectively by different subregions corresponding in left-side images display channel and image right display channel
The size of black field crossfire value.
The data representing liquid crystal display screen crossfire value can be obtained therefore according to above-mentioned explanation and with reference to the data in table 1, such as
Shown in table 2 below:
Table 2
Last two item data in above-mentioned table 2 be by the crossfire value of the same type in 9 regions be weighted average it
Calculate the meansigma methodss of dissimilar crossfire value and the maximum in all regions afterwards.
In order to weigh the crossfire value of model machine whether in the range of standard, generally require the inhomogeneity presetting liquid crystal display screen
According to long term test, the threshold values of the crossfire value of type, shows that corresponding different types of crossfire value should preset different threshold values respectively,
The meansigma methodss of described dissimilar crossfire value and/or maximum are compared with corresponding default threshold values, respectively when described inhomogeneity
When the meansigma methodss of type crossfire value and/or maximum are no more than corresponding default threshold values, described liquid crystal display screen is suitable for adopting 3d skill
Art；Conversely, described liquid crystal display screen is not suitable for using 3d technology.Under conditions of accumulating through overtesting, adopt in this specific embodiment
It is 12% with the default meansigma methodss threshold values of corresponding white field crossfire value, maximum threshold values is 15%；Correspondence black field brightness value is default flat
Average threshold values is 1.8, and maximum is that 2.5 liquid crystal display screen all compares and is suitable as 3d screen.This specific embodiment then needs by
Described meansigma methodss and maximum are compared with default threshold values.In table 2, the white field crossfire value maximum of display is left 13%
The right side, meansigma methodss are in 10%-11%；And black field brightness value maximum is 2.4 about, meansigma methodss 1.67 about, are carried with above-mentioned
For pre-set threshold value be compared after, illustrate that this model machine 3d crossfire value is smaller, be suitable as 3d screen.
Because the present invention uses, liquid crystal display screen is divided into the crossfire value that multiple regions measure these regions respectively, therefore
Ensure that measuring data sample is sufficiently large, the meansigma methodss of the result of all regions crossfire value measurement can be completely secured reflection entirely
The overall condition of crossfire value in liquid crystal display screen, just can be adopted the whole liquid crystal display screen of relatively accurate reflection by being compared with default threshold values
With the whole structure of 3d technology it is ensured that the accuracy of measuring method of the present invention；By extracting the crossfire value sample of zones of different
Maximum, can accurately reflect in whole liquid crystal display screen to 3d technique influence the best part, by the comparison with pre-set threshold value
Ensure that the subregion predicting whether in all liquid crystal display screens is suitable for using 3d technology it is ensured that the stablizing of measuring method of the present invention
Property.Therefore liquid crystal display screen be should be ensured that with hardware device is as far as possible under conditions of allowing more and divide subregion, to improve the present invention further
The accuracy of measuring method and stability.
It is further to note that due to of the present invention be 3d technology show graph card in image it should be ensured that
Ensure the seriality of visual effect during alternately display black, white image, individually show black image or white
The frequency of image show under the conditions of being not less than 2d and ensures the successional frequency values of image visual effect it is preferable that so described
The display frequency of the default display frequency of liquid crystal display screen and 3d filter plant is all higher than equal to 100hz, more preferably greater than or equal to
120hz.
And because the filter plant of the present invention uses shutter 3d glasses and is measured bright by shutter 3d glasses
The equipment of degree is preferably luminance meter hence it is evident that measurement hardware device is simple, easy to operate, low cost, and fast response time is it is ensured that whole
Individual invention measuring method is easy to use and with low cost
By using above-mentioned technical scheme, the present invention removes using white, outside black signal, using middle gray in full frame
On 9 points, crosstalk performance is evaluated, provide the unified calculating for liquid crystal and plasm TV with principles such as standard deviations
Method.By using above-mentioned technical scheme, the invention provides one kind realizes simple and convenient, low cost, measurement result is accurate
3d crossfire value measuring method.
Protection scope of the present invention is not limited to the specific embodiment disclosed in specific embodiment, as long as but meeting
In the claims in the present invention, the combination of technical characteristic just fall within protection scope of the present invention.
Claims (6)
1. a kind of 3d crosstalk value measurement method of liquid crystal display screen is it is characterised in that the method includes:
When left images display channel all obtains white image, shown by the left side display channel and right side of shutter 3d glasses
Show that the brightness value that passage records is l (ww), r (ww)；
When left-side images display channel obtains white image, and image right display channel obtains black image, by described fast
The brightness value that the left side display channel of gate-type 3d glasses and right side display channel record is l (wb), r (wb)；
When described left images display channel all obtains black image, by the left side display channel of described shutter 3d glasses
The brightness value recording with right side display channel is l (bb), r (bb)；
Wherein, the white field crossfire value calculating side of white image is received by the left-side images display channel of described shutter 3d glasses
Method is: crosstalk (l)=(l (ww)-l (wb))/(l (ww)-l (bb));Or
By the white field crosstalk value calculating method that the image right display channel of described shutter 3d glasses receives white image it is:
crosstalk(r)=(r(ww)-r(wb))/(r(ww)-r(bb)).
2. according to claim 1 a kind of 3d crosstalk value measurement method of liquid crystal display screen it is characterised in that liquid crystal display screen is divided into
At least two regions；
Receive zones of different by described shutter 3d glasses and alternately show black, white image brightness；
Calculate the crossfire value obtaining each zones of different by recording described brightness value.
3. the 3d crosstalk value measurement method of a kind of liquid crystal display screen according to claim 2, each described region is corresponding described
The black field brightness value that shutter 3d glasses left-side images display channel reception black image is produced by crosstalk is l (bw): institute
The corresponding described shutter 3d glasses image right display channel in each region stated is received black image and is produced due to crosstalk
Black field brightness value be r (bw), described black field brightness value l (bw), r (bw) makes as the standard of directly measurement crossfire value size
With.
4. according to Claims 2 or 3 a kind of 3d crosstalk value measurement method of liquid crystal display screen it is characterised in that by n region
Same type crossfire value be weighted average after calculate all regions the meansigma methodss of dissimilar crossfire value and/or
Maximum, and described meansigma methodss and/or maximum are compared with default threshold values.
5. according to claim 4 a kind of liquid crystal display screen 3d crosstalk value measurement method it is characterised in that correspondence dissimilar
Crossfire value should preset different threshold values respectively, the meansigma methodss of described dissimilar crossfire value and/or maximum respectively with right
Should compare default threshold values, when the meansigma methodss of described dissimilar crossfire value and/or maximum are default no more than correspondence
During threshold values, described liquid crystal display screen is suitable for 3d image and shows；Conversely, described liquid crystal display screen is not suitable for 3d image showing.
6. the 3d crosstalk value measurement method according to a kind of arbitrary described liquid crystal display screen of claim 2 and 3 is it is characterised in that adopt square
The zoned format of battle array carries out region division to liquid crystal display screen, and different regions is of similar shape and area.
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| CN201110143593.3A CN102811363B (en) | 2011-05-31 | 2011-05-31 | Method for measuring 3D (Three-Dimensional) crosstalk value of liquid crystal display |
| CN201510040479.6A CN104581148B (en) | 2011-05-31 | 2011-05-31 | Method for measuring 3D crosstalk values of liquid crystal display |
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| CN105915894A (en) * | 2016-05-10 | 2016-08-31 | 康佳集团股份有限公司 | Naked eye stereotelevision 3D crosstalk value measuring method |
| CN105915884A (en) * | 2016-06-06 | 2016-08-31 | 乐视控股（北京）有限公司 | Method for preventing display terminal 3D crosstalk and system thereof |
| CN106454326A (en) * | 2016-10-13 | 2017-02-22 | 张家港康得新光电材料有限公司 | Crosstalk value test device |
| KR102590013B1 (en) * | 2018-09-10 | 2023-10-16 | 엘지디스플레이 주식회사 | Display Device having the Black Image Inserting Function |
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