CN105390087A - Device and method for inspecting gray value - Google Patents
Device and method for inspecting gray value Download PDFInfo
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- CN105390087A CN105390087A CN201510535584.7A CN201510535584A CN105390087A CN 105390087 A CN105390087 A CN 105390087A CN 201510535584 A CN201510535584 A CN 201510535584A CN 105390087 A CN105390087 A CN 105390087A
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- pixel
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Engineering & Computer Science (AREA)
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Control Of El Displays (AREA)
Abstract
The invention provides a gray value inspecting method for effectively adjusting whole gamma chart of an organic EL display. The method comprises a gray value shooting step and a characteristics calculating step in order, wherein under the state of pixels of the display has each emitting color of sub-pixels, and a multi-gray pattern applied by different voltage is displayed in a display (100) according to the pixel position, a camera (10) is used for shooting entire multi-gray pattern, the characteristics calculating step can measure the brightness of each area in the multi-gray image shot in gray value shooting step and calculate the gamma curve of the brightness relation between the gray value of sub-pixel and multi-gray image.
Description
Technical field
The present invention relates to the gamma adjustment method of display.
Background technology
In order to adjust the relation of the brightness in display relative to gray scale, carry out the adjustment of the magnitude of voltage (gammatable: gamma table) relative to gray scale.In order to adjust gamma table, proposing and utilizing point type nitometer to measure brightness under multi-stage grey scale to carry out the method (for example, referring to Japanese documentation 1) of the adjustment of gamma table.In the past, this point type nitometer is utilized to measure the brightness of certain narrow range (such as, immediate vicinity) on display.
Point type nitometer can only measure the brightness under a gray scale in once measuring.Therefore, when obtaining the relation of adjustment gamma table necessary brightness relative to gray scale, just needing the mensuration of repeatedly repeatedly carrying out brightness while changing gray scale, adjusting problem consuming time so exist.
In addition, when the position of the display measured with point type nitometer is just in time uneven part, the impact that this is uneven is likely subject to.Now, exist and be subject to the uneven impact of display, cannot the problem of Correctly adjust gamma table.
Particularly, in organic EL (ElectroLuminescence: electroluminescence) display, the brightness change of each position is different.Therefore, if only measure a position, then the adjustment of local is become, the problem that existence adjustment is as a whole undesirable.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2011-170106 publication
Summary of the invention
Technical matters
Like this, as the gamma table using point type nitometer to adjust display, then there is problem consuming time.Although can shorten the time by using the device of multiple stage adjustment, the number of units that there is device increases, the problem that cost correspondingly rises.
In addition, as the gamma table using point type nitometer to adjust OLED display, although the position of mensuration can be adjusted, cannot say that the gamma as display entirety becomes optimum value.
So, the object of the present invention is to provide the gray scale inspection method effectively can carrying out the adjustment of the gamma table of display entirety.
Technical scheme
Gray scale testing fixture of the present invention possesses: display control unit, and each glow color of the sub-pixel that the pixel for display possesses, shows the many greyscale pattern applying different voltage according to the position of pixel in aforementioned display; And handling part, the brightness in each region in the multi-grey image that the aforementioned many greyscale pattern of mensuration camera shooting are overall and obtain, and for each glow color of aforementioned sub-pixel, obtain the gamma curve of the relation between gray scale and the brightness of aforementioned multi-grey image representing the display of aforementioned sub-pixel.
Alternatively, in gray scale testing fixture of the present invention, aforementioned many greyscale pattern have in the pixel applying different voltage the black line that aforementioned camera can identify each other.
Alternatively, in gray scale testing fixture of the present invention, for aforementioned many greyscale pattern, the voltage more applied close to the center of aforementioned display is lower, and the voltage more applied close to the edge of aforementioned display is higher.
Alternatively, in gray scale testing fixture of the present invention, described display control unit is also for each glow color of aforementioned sub-pixel, in aforementioned display, show the single greyscale pattern all pixels being applied to common voltage, aforementioned processing portion measures the brightness of the single gray level image obtained by the aforementioned single greyscale pattern entirety of aforementioned camera shooting.
Gray scale inspection method of the present invention has in order: gray scale shooting step, at each glow color of the sub-pixel that the pixel for display possesses, show in aforementioned display under applying the state of many greyscale pattern of different voltage according to the position of pixel, utilize camera to take aforementioned many greyscale pattern entirety; And characteristic calculation steps, be determined at the brightness in each region in aforementioned gray scale shooting step in the multi-grey image taken, and obtain the gamma curve of the relation between gray scale and the brightness of aforementioned multi-grey image representing the display of aforementioned sub-pixel for each glow color of aforementioned sub-pixel.
Alternatively, in gray scale inspection method of the present invention, the aforementioned many greyscale pattern in aforementioned gray scale shooting step have in the pixel applying different voltage the black line that aforementioned camera can identify each other.
Alternatively, in gray scale inspection method of the present invention, for the aforementioned many greyscale pattern in aforementioned gray scale shooting step, more lower close to the voltage that the center of aforementioned display applies, the voltage more applied close to the edge of aforementioned display is higher.
Alternatively, in gray scale inspection method of the present invention, in aforementioned gray scale shooting step, also at each glow color for aforementioned sub-pixel, show under the state of single greyscale pattern of common voltage is applied to all pixels in aforementioned display, aforementioned camera is utilized to take aforementioned single greyscale pattern entirety, in afore-mentioned characteristics calculation procedure, the brightness of the single gray level image that mensuration is taken aforementioned single greyscale pattern entirety and obtained.
Should illustrate, above-mentioned each invention can be combined as much as possible.
Technique effect
According to the present invention, effectively can adjust the gamma table of display entirety, shorten working procedure duration.
Accompanying drawing explanation
Fig. 1 illustrates the formation example of the gray scale adjustment System of present embodiment.
Fig. 2 illustrates the first pixel arrangement example of display.
Fig. 3 illustrates the second pixel arrangement example of display.
Fig. 4 illustrates an example of the initial value of gamma table.
Fig. 5 illustrates an example of many greyscale pattern.
Fig. 6 illustrates an example of the gamma table obtained according to multi-grey image.
Fig. 7 illustrates an example of the gamma table of adjustment aim.
Fig. 8 illustrates an example of the gamma table obtained in characteristic calculation steps.
Symbol description
10: camera
30: gray scale testing fixture
31: handling part
32: storage part
33: control part
100: display
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described in detail.Should illustrate, the present invention is not limited to embodiment shown below.These embodiments only exemplarily, the present invention can by carrying out various change based on the knowledge of those skilled in the art, the mode of improvement implements.Should illustrate, the composed component that symbol is identical in the present description and drawings represents same parts respectively.
Fig. 1 illustrates an example of the gray scale adjustment System of present embodiment.The gray scale adjustment System of present embodiment possesses camera 10 and gray scale testing fixture 30.Gray scale testing fixture 30 possesses handling part 31, storage part 32 and control part 33.Control part 33 plays a role as the display control unit of the display action controlling display 100.
Gray scale testing fixture 30 can realize by being played a role as handling part 31 and control part 33 by computing machine.Now, perform by the CPU (CentralProcessingUnit: CPU (central processing unit)) in gray scale testing fixture 30 computer program be stored in storage part 32 and realize each formation.
Fig. 2 and Fig. 3 illustrates an example of display 100.Display 100 is the display device being arranged with the pixel of the light sending random color of LCD (LiquidCrystalDisplay: liquid crystal display) or OLED display etc.Each pixel possesses multiple sub-pixel, and each sub-pixel sends the light of different colours.Such as, a pixel possesses red sub-pixel R
1,1, green sub-pixel G
1,1with the sub-pixel B of blueness
1,1.A pixel can also comprise the sub-pixel of the light sending other colors.Such as, as shown in Figure 2, the sub-pixel W of white can be comprised
1,1.In addition, pixel also can comprise the sub-pixel of multiple same color.Such as, the sub-pixel W shown in Fig. 2 can be replaced
1,1and comprise green sub-pixel G
1,1.
Camera 10 is for can take the area sensor of the whole pattern shown by display 100 simultaneously.Resolution is arbitrary value.Although need the image of the whole picture of the display 100 according to shooting to detect the gray scale of the color of each pixel, when each pixel cannot be separated, dealt with by the interval of the pixel of amplifying display.Owing to needing the gray scale to the different each sub-pixel identification glow color of the color forming pixel, so camera 10 has the susceptibility of the glow color to sub-pixel.
The gray scale inspection method of present embodiment has gray scale shooting step and characteristic calculation steps in order.In gray scale shooting step, each glow color of the sub-pixel that control part 33 possesses for the pixel of display 100, by many greyscale pattern and the display of single greyscale pattern on display 100, the whole picture of display 100 taken by camera 10.In characteristic calculation steps, each glow color of the sub-pixel that the pixel for display 100 possesses, handling part 31 utilizes multi-grey image and single gray level image to calculate the gamma curve of the sub-pixel of display 100.
Gray scale shooting step is described in detail.Control part 33 plays a role as display control unit, for any one glow color in the sub-pixel that the pixel of display 100 possesses, by many greyscale pattern displays on display 100.Now, control part 33 is stored in storage part 32 by the pixel of display 100 and to the display information of the voltage that this pixel applies and so on.The whole light-emitting zone of display 100 taken by camera 10.Like this, in the present embodiment, the bust shot needing mobile cameras 10 is not carried out.Therefore, it is possible to not by the uneven impact of display, best gamma adjustment is carried out to display 100 entirety.
Here, in the present embodiment, in order to measure the gamma curve of whole picture, for any one glow color of sub-pixel, control part 33 shows the many greyscale pattern applying different voltage according to the position of pixel in display 100.Such as, the initial value of the relation between the voltage that sub-pixel is applied and gray scale be as shown in Figure 4, many greyscale pattern become and apply 0.25V at the immediate vicinity of display 100, apply the pattern of 5.0V at the adjacent edges of display 100.The multi-grey image of shooting many greyscale pattern entirety is stored in storage part 32 by camera 10.The gray scale of many greyscale pattern is different according to the position of pixel.Like this, in the present embodiment, the brightness of disposable Simultaneously test multi-stage grey scale.Therefore, in gray scale shooting step, do not need repeatedly to measure brightness while change gray scale, can minute be shortened.
In addition, for the glow color common with many greyscale pattern, control part 33 shows in display 100 and applies common voltage to all pixels and the single greyscale pattern obtained.The single gray level image of the single greyscale pattern entirety of shooting is stored in storage part 32 by camera 10.On the other hand, nitometer measures the brightness of single greyscale pattern.The brightness of storage part 32 storing measurement.Common voltage is such as maximum voltage or medium voltage.When specific voltage is maximum voltage, the maximum voltage due to many greyscale pattern is 5.0V, so single greyscale pattern becomes the pattern obtained all pixels applying 5.0V.By storing single greyscale pattern, point type nitometer can be used measure the brightness of lighting gray scale, the uneven impact caused of display 100 can be reduced by single greyscale pattern shooting image separation many greyscale pattern shooting image.
Fig. 5 illustrates an example of many greyscale pattern.Many greyscale pattern preferably eliminate the pattern of the uneven impact of display 100.Such as, preferably same voltage is applied in multiple region.Such as, make the gray scale of region ARE1 ~ ARE4 unified.Owing to adopting camera 10, the light of periphery can die down.In order to avoid its impact, preferably, configuring area ARE1 ~ ARE4 as described below.Preferably, region ARE1 ~ ARE4 is with the region of radial decile relative to the center of display 100.In addition, preferably, many greyscale pattern have differential.Such as, preferably, the gray scale of region ARE1 ~ ARE4 is along with the increase of the distance apart from display 100 center, and brightness improves successively.
In addition, preferably, many greyscale pattern have in the pixel applying different voltage the black line that camera 10 can identify each other.Like this, preferably between the gray scale of many greyscale pattern, insert black line, make not to be affected between gray scale.Such as, by rejecting the pixel lighted in display 100, thus the pattern that can be separated each pixel can be shown.Such as, with vertical or horizontal or two-way clathrate, more than one pixel lighted and show.By rejecting the pixel lighted, the light that each pixel can be sent when not carrying out needing the bust shot of mobile cameras 10 is separated.
Usually, the dynamic range of display brightness is wide according to the dynamic range of camera.So when the gray scale of camera 10 is fewer than the gray scale of display 100, for greyscale pattern more than, more than 10 the change time shutter of camera takes, to correspond to the dynamic range of display brightness.Now, in the CCD of camera 10, combination of pixels (Binning: the merging of multiple pixel value) is preferably carried out, to improve susceptibility.Thereby, it is possible to shorten the time shutter.
In characteristic calculation steps, handling part 31 measures the brightness in each region in multi-grey image, and obtains for each glow color of sub-pixel the gamma curve representing the relation be applied between the voltage of sub-pixel and the brightness of multi-grey image.Thus, utilize the multi-grey image of shooting, each glow color of sub-pixel is calculated to the brightness of each gray scale.
Such as, display information when handling part 31 obtains display many greyscale pattern from storage part 32, and to the brightness that each area test multi-grey image shown after the identical voltage of applying comprises.Thus, handling part 31 derives the gamma curve representing the relation be applied between the voltage of sub-pixel and the brightness of multi-grey image.The brightness that gamma curve is expression multi-grey image is as shown in Figure 6 relative to the function of the corresponding relation of the gray scale shown by display 100.The gamma curve of acquisition is stored in storage part 32 by handling part 31.
Here, in the present embodiment, for a gray scale, four different region ARE1 ~ ARE4 are utilized to represent.Therefore, it is possible to suppress to cause luminosity to there is the impact of deviation because of the individual difference of pixel.In addition, in display 100, the gray scale of display can be the voltage applied the sub-pixel of display 100.Handling part 31 can also obtain the inverse function of the gamma curve of derivation.
Handling part 31 to be undertaken converting the brightness (relative value) obtained relative to gray scale by utilizing the brightness value that measures in single gray level image.Converting makes the CCD pixel value of the image utilizing camera 10 to take corresponding with brightness.Such as carry out in such a way converting and making the CCD pixel value of image corresponding with brightness, if that is, the brightness of single greyscale pattern is 200cd/m
2, the CCD pixel value of single gray level image is 100, then the CCD pixel value of multi-grey image is the position of 50, and brightness is 100cd/m
2, the CCD pixel value of multi-grey image is the position of 150, and brightness is 300cd/m
2.Thereby, it is possible to obtain the relation of the brightness before gamma adjustment relative to gray scale.
Handling part 31 sets the object brightness after gamma adjustment.The desired value of brightness shown when object brightness is input maximum gray scale after gamma adjustment, can set arbitrarily.Such as, in the brightness of after gamma adjustment as shown in Figure 60 ~ 275, with brightness " 225 " for object brightness.Should illustrate, with regard to object brightness, often kind of color is different, and the object brightness of each color is determined according to white balance.
Handling part 31 utilizes object brightness and gamma value to obtain the gamma curve of the adjustment aim represented by following formula.
(formula 1)
L(g)＝L
max(g/g
max)
γ
Here, L
maxfor object brightness, g is gray scale, g
maxfor maximum gray scale, γ is gamma value.Fig. 7 represents an example of the gamma curve of adjustment aim.
Handling part 31 utilizes the gamma curve of adjustment aim to generate gamma table.Fig. 8 illustrates an example of the gamma table obtained in characteristic calculation steps.If Fig. 6 is L=f
1g (), Fig. 7 are L=f
2g (), then Fig. 8 can utilize g '=f
1 -1(f
2(g)) obtain.Here, according to Fig. 4, voltage when gray scale is 175 is 3.5V.Now, represent that the magnitude of voltage upper limit in the gamma table of the relation be applied between the voltage of sub-pixel and gray scale is 3.5V.In addition, in fig. 8, the gray scale being less than more than 0 175 is in figure 6 set to less than more than 0 255, the voltage in the diagram for more than 0V below 5V is set to more than 0V below 3.5V.Like this, by performing characteristic calculation steps, the gamma table of sub-pixel can be obtained.
As mentioned above, invention according to the present embodiment, due to the brightness of disposable Simultaneously test multi-stage grey scale, so without the need to repeatedly measuring brightness while change gray scale, just can shorten minute.In addition, by the uneven impact of display 100, and best gamma adjustment can not be carried out to display 100 entirety.Therefore, the invention of present embodiment effectively can carry out gamma adjustment, shortens operation.
Utilizability in industry
The present invention can be applied to display industry.
Claims (8)
1. a gray scale testing fixture, possesses:
Display control unit, each glow color of the sub-pixel that the pixel for display possesses, shows the many greyscale pattern applying different voltage according to the position of pixel in described display; With
Handling part, the brightness in each region in the multi-grey image that the described many greyscale pattern of mensuration camera shooting are overall and obtain, and for each glow color of described sub-pixel, obtain the gamma curve of the relation between gray scale and the brightness of described multi-grey image representing the display of described sub-pixel.
2. gray scale testing fixture according to claim 1, wherein,
Described many greyscale pattern have in the pixel applying different voltage the black line that described camera can identify each other.
3. gray scale testing fixture according to claim 1 and 2, wherein,
For described many greyscale pattern, the voltage more applied close to the center of described display is lower, and the voltage more applied close to the edge of described display is higher.
4. the gray scale testing fixture according to any one of claims 1 to 3, wherein,
Described display control unit, also for each glow color of described sub-pixel, shows the single greyscale pattern all pixels being applied to common voltage in described display,
Described handling part measures the brightness of the single gray level image obtained by the described single greyscale pattern entirety of described camera shooting.
5. a gray scale inspection method, has following steps in order:
Gray scale shooting step, at each glow color of the sub-pixel that the pixel for display possesses, show in described display under applying the state of many greyscale pattern of different voltage according to the position of pixel, utilize camera to take described many greyscale pattern entirety; With
Characteristic calculation steps, be determined at the brightness in each region in described gray scale shooting step in the multi-grey image taken, and obtain the gamma curve of the relation between gray scale and the brightness of described multi-grey image representing the display of described sub-pixel for each glow color of described sub-pixel.
6. gray scale inspection method according to claim 5, wherein,
Described many greyscale pattern in described gray scale shooting step have in the pixel applying different voltage the black line that described camera can identify each other.
7. the gray scale inspection method according to claim 5 or 6, wherein,
For the described many greyscale pattern in described gray scale shooting step, more lower close to the voltage that the center of described display applies, the voltage more applied close to the edge of described display is higher.
8. the gray scale inspection method according to any one of claim 5 ~ 7, wherein,
In described gray scale shooting step, also at each glow color for described sub-pixel, show in described display under the state of single greyscale pattern of common voltage is applied to all pixels, utilize described camera to take described single greyscale pattern entirety
In described characteristic calculation steps, the brightness of the single gray level image that mensuration is taken described single greyscale pattern entirety and obtained.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-174975 | 2014-08-29 | ||
| JP2014174975A JP2016050983A (en) | 2014-08-29 | 2014-08-29 | Gray scale inspection apparatus and gray scale inspection method |
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| Publication Number | Publication Date |
|---|---|
| CN105390087A true CN105390087A (en) | 2016-03-09 |
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| CN201510535584.7A Pending CN105390087A (en) | 2014-08-29 | 2015-08-27 | Device and method for inspecting gray value |
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|---|---|
| JP (1) | JP2016050983A (en) |
| KR (1) | KR20160026681A (en) |
| CN (1) | CN105390087A (en) |
| TW (1) | TW201626351A (en) |
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| CN107403177A (en) * | 2017-05-27 | 2017-11-28 | 延锋伟世通汽车电子有限公司 | Brightness measurement method based on industrial camera |
| WO2017210960A1 (en) * | 2016-06-08 | 2017-12-14 | 深圳市华星光电技术有限公司 | Gamma correction system and method |
| CN107479222A (en) * | 2017-08-28 | 2017-12-15 | 惠科股份有限公司 | Measure the method for measurement and its device of display panel |
| CN110534061A (en) * | 2019-09-05 | 2019-12-03 | 合肥鑫晟光电科技有限公司 | Compensation method, compensation device and display device |
| CN111487795A (en) * | 2020-05-13 | 2020-08-04 | Tcl华星光电技术有限公司 | Light leakage brightness detection system and detection method |
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| CN113795879A (en) * | 2019-04-17 | 2021-12-14 | 深圳云英谷科技有限公司 | Method and system for determining grey scale mapping correlation in display panel |
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| CN110827734A (en) * | 2018-08-07 | 2020-02-21 | 钰纬科技开发股份有限公司 | Automatic Gamma curve setting method for display |
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| JP2011170106A (en) | 2010-02-18 | 2011-09-01 | Canon Inc | Image display apparatus and method for controlling image display apparatus |
-
2014
- 2014-08-29 JP JP2014174975A patent/JP2016050983A/en active Pending
-
2015
- 2015-08-04 KR KR1020150110101A patent/KR20160026681A/en unknown
- 2015-08-27 CN CN201510535584.7A patent/CN105390087A/en active Pending
- 2015-08-28 TW TW104128276A patent/TW201626351A/en unknown
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| CN107403177A (en) * | 2017-05-27 | 2017-11-28 | 延锋伟世通汽车电子有限公司 | Brightness measurement method based on industrial camera |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2016050983A (en) | 2016-04-11 |
| KR20160026681A (en) | 2016-03-09 |
| TW201626351A (en) | 2016-07-16 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160309 |
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| WD01 | Invention patent application deemed withdrawn after publication |