CN113921743B - Method for detecting uneven brightness (Mura) of organic light emitting diode display - Google Patents
Method for detecting uneven brightness (Mura) of organic light emitting diode display Download PDFInfo
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
- H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/20—Sequence of activities consisting of a plurality of measurements, corrections, marking or sorting steps
- H01L22/22—Connection or disconnection of sub-entities or redundant parts of a device in response to a measurement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/20—Sequence of activities consisting of a plurality of measurements, corrections, marking or sorting steps
- H01L22/24—Optical enhancement of defects or not directly visible states, e.g. selective electrolytic deposition, bubbles in liquids, light emission, colour change
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/15—Deposition of organic active material using liquid deposition, e.g. spin coating characterised by the solvent used
Abstract
The invention discloses a method for detecting Mura formed by printing ink volume difference in pixels by ink-jet printing organic light-emitting diodes (OLED), which comprises the following steps: comparing the position and the size of the image gray scale deviation of each pixel after gray scale processing, and screening out pixels different from the positions and the sizes of the gray scale images of other pixels; comparing the position deviation situation of the Newton rings generated in each pixel, and screening out pixels with different positions from the Newton rings of other pixels; and comparing the number of Newton rings generated in each pixel, and screening out the pixels with the number different from the Newton rings of other pixels. By superposing the three groups of schemes, the abnormal pixel with the ink volume of the ink-jet printing pixel being more than or equal to 3% of the ink volume of other pixels can be accurately screened out.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method for detecting Mura formed by printing ink volume difference in an ink-jet printing organic light-emitting diode (OLED) pixel.
Background
Currently, organic light-emitting diodes (OLEDs) are gradually expanding their market impact due to their special qualities such as low power consumption, fast response speed, high contrast, wide color gamut, lighter and thinner LCDs, and capability of realizing flexible display. The mainstream OLED production process at present is a high-precision metal mask (FMM) evaporation process, which can realize mass production of small-sized high-pixel-density (PPI) OLED screens. In the field of large-size OLED display, the mass production of LG is realized by adopting an evaporation process, but the large-size evaporation process has the defects of complex film layer structure, low yield, high material cost and difficulty in realizing the low-cost preparation of the OLED display.
The inkjet printing (IJP) OLED is a novel OLED preparation process, and compared with the traditional evaporation process, the inkjet printing OLED is printed according to the requirements of organic materials, so that 90% of raw materials can be saved, the inkjet printing OLED does not need to be carried out in vacuum, and high-precision printing can be realized only by controlling the precision of a spray head. However, the printing head of the current ink-jet printing equipment has poor stability, and the condition that ink is mixed together (Bridge) or the ink volume is inconsistent (the volume difference is more than or equal to 3%) occurs in the printing process, so that visible Mura (the difference of light color and brightness of pixels, which is macroscopically expressed due to the fluctuation of the volume of ink ejected by the nozzle and the skew of ink) occurs after printing.
Therefore, a detection method capable of effectively detecting the organic light-emitting diode (OLED) generating the Mura is needed.
Disclosure of Invention
The invention aims to solve the technical problem of effectively avoiding the Mura after printing caused by the condition that different pixels have mixed ink (Bridge) or the ink volume is inconsistent (the volume difference is more than or equal to 3%) in the ink-jet printing process. To solve the above problems, an embodiment of the present invention provides a Mura detection method under an inkjet printing wet film condition, the method comprising the steps of:
a step S1 of detecting that when the ink volume of the ink jet printing ink is greater than or equal to a predetermined value, the ink volume of the pixel is greater than 10% of the ink volume of the other pixels, and detecting adjacent pixels having ink mixing therebetween, the step S1 including: comparing the position and the size of the image of each pixel after gray scale processing, screening out the pixels with the positions and the sizes of the gray scale images different from the other pixels, and regarding the pixels as abnormal pixels;
step S2 is a step of detecting a pixel in which a deviation between an ink volume of an inkjet-printed pixel and an ink volume of another pixel is 3% to 10%, and the step S2 includes: comparing the position deviation situation of the Newton rings generated in each pixel, screening out the pixels with different positions from the Newton rings of other pixels, and regarding the pixels as abnormal pixels; and
a step S3 for detecting a pixel in which an ink volume of the pixel is greater than 10% of ink volumes of other pixels when the ink volume of the ink-jet printing ink is less than the predetermined value, the step S3 including: and comparing the number of the Newton rings generated in each pixel, screening out the pixels with the number different from the number of the Newton rings of the other pixels, and regarding the pixels as abnormal pixels. According to an embodiment of the present invention, before step S1, in the method for detecting the luminance unevenness of the OLED, the method further includes: in step S01, a light source is provided to form parallel incident light through the first lens group, and the parallel incident light is vertically incident to the pixels containing ink.
According to an embodiment of the present invention, in the method for detecting the luminance nonuniformity of the OLED, the light source includes: white light, sodium lamps, or lasers.
According to an embodiment of the present invention, in step S01 of the method for detecting luminance nonuniformity of an OLED, the parallel incident light is diverted by the second lens group so that the parallel incident light is perpendicularly incident to the pixels containing ink.
According to an embodiment of the present invention, in the method for detecting the luminance unevenness of the OLED, after the step S01, the method further includes: step S02, capturing the pixel by using a charge-coupled device (CCD) to obtain an image in which the pixel displays the newton ring.
According to an embodiment of the present invention, in the step S02 of the method for detecting the luminance nonuniformity of the OLED, the imaging angle of the CCD takes the incident direction of the parallel incident light as a symmetry axis, and the pixel is imaged at an angle of 0 to 2 ° with respect to the symmetry axis.
According to an embodiment of the present invention, in the method for detecting the luminance unevenness of the OLED, after the step S02, the method further includes: step S03, converting the image with the newton ring into a gray scale to obtain the gray-scale processed image.
According to one embodiment of the invention, in the method for detecting the brightness unevenness of the OLED, the detection method is performed in a state that the ink is wet or in a wet film state.
According to an embodiment of the present invention, in the method for detecting the luminance unevenness of the OLED, after the step S3, the method further includes: in step S4, after the abnormal pixel is detected while the ink is still in a wet film state, the ink in all the pixels is removed by the chemical solution, the inkjet printing is performed on the pixels again, and steps S1 to S3 are repeated for the pixels. In some embodiments of the present invention, the liquid medicine comprises one or more of secondary alkyl substituted aromatic hydrocarbon, alkoxy substituted aromatic hydrocarbon, normal alkyl substituted aromatic hydrocarbon, triethylene glycol methyl ether, and 2- (benzyloxy) ethanol, which are mixed according to a certain ratio.
According to an embodiment of the present invention, in the method for detecting the luminance nonuniformity of the OLED, the predetermined value is 24 picoliters (pl, 10)-12L), and the ink volume of the outlier pixel is greater than or equal to 3% of the ink volume of the other pixels.
The invention provides a method for detecting uneven brightness of an organic light-emitting diode (OLED), which relates to a mode of detecting Mura under the condition that ink-jet printing ink of pixels printed by ink-jet is wet, wherein a parallel light source formed by different light sources (white light, sodium lamps and laser) irradiates the surface of a substrate of the OLED to form a Newton ring image presented by interference diffraction, and the position and volume difference generated by Mura are judged by judging the number of Newton rings, the position presented by the Newton rings and the gray scale difference between pixels, so that abnormal pixels with Mura problems of different degrees in the pixels are detected. The method for detecting the uneven brightness of the organic light-emitting diode (OLED) provided by the invention is used for checking the display Mura of different degrees, can effectively detect the pixels causing the display Mura, and plays a key role in ensuring the yield of products; in addition, the development of a recovery and reproduction (Rework) technology in a wet film state is combined, so that the yield of products can be further improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required in the description of the embodiments or the prior art:
FIG. 1 is a schematic diagram illustrating a method for capturing an image of an Organic Light Emitting Diode (OLED) pixel in a wet film state of an inkjet printing ink using a charge-coupled device (CCD) to obtain a Newton's Ring image of the pixel, in accordance with one embodiment of the present invention;
FIG. 2 is an image captured by a charge-coupled device (CCD) according to the method shown in FIG. 1;
FIG. 3 is a schematic view showing a charge-coupled device (CCD) capturing an image of a pixel according to an embodiment of the present invention;
FIG. 4a is a diagram showing the conversion of an image with Newton's rings displayed by an abnormal pixel (when the ink volume of the ink-jet printing ink is greater than or equal to 24pl, the ink volume of the pixel is greater than 10% of the ink volume of other pixels) into gray scale to obtain a gray scale processed image according to an embodiment of the present invention;
FIG. 4b is a diagram illustrating conversion of an image with Newton's rings displayed in normal pixels to gray scale to obtain a gray scale processed image according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a conversion of an image with Newton's rings into gray levels for abnormal pixels (pixels with color mixing during printing) to obtain a gray-level processed image according to an embodiment of the present invention;
FIG. 6 is a graph showing Newton's Ring offset for an anomalous pixel (a pixel having ink-jet printed ink volumes that deviate from ink volumes of other pixels by 3% to 10%) versus a normal pixel, in accordance with one embodiment of the present invention;
FIG. 7 is a graph showing Newton's ring shift for an abnormal pixel (where the ink volume of the ink-jet printed pixel deviates from the ink volume of other pixels by 3% to 10%) compared to a normal pixel, in accordance with one embodiment of the present invention;
FIG. 8 is a graph showing the increase in the number of Newton rings for an anomalous pixel (a pixel having an ink volume 10% greater than the ink volume of other pixels when the ink volume is less than 24 pl) compared to a normal pixel, in accordance with one embodiment of the present invention;
FIG. 9 is a diagram of an image showing an increase in the number of Newton rings for an anomalous pixel (where the ink volume of the pixel is greater than 10% of the ink volume of other pixels when the ink volume of the ink-jet printed is less than 24 pl) compared to a normal pixel, in accordance with one embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details or with a specific approach described.
The invention provides a method for detecting Mura formed by ink volume difference in inkjet printing organic light-emitting diode (OLED) pixels, which is a mode for detecting the Mura when the inkjet printing ink of the inkjet printing pixels is in a wet film state, wherein a substrate surface of the OLED is irradiated by parallel light sources formed by different light sources (white light, sodium lamps and laser) to form a Newton ring image presented by interference diffraction, and the position and the volume difference generated by the Mura are judged by judging the number of Newton rings, the positions of the Newton rings and the gray scale difference between the pixels, so that abnormal pixels with Mura problems of different degrees in the pixels are detected.
Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating a method for capturing an Organic Light Emitting Diode (OLED) pixel in a wet film state of an inkjet printing ink by using a charge-coupled device (CCD) to obtain an image with newton's rings displayed on the pixel according to an embodiment of the present invention; FIG. 2 is an image captured by a charge-coupled device (CCD) according to the method shown in FIG. 1; fig. 3 is a schematic view showing a charge-coupled device (CCD) capturing angle of a pixel image according to an embodiment of the invention. As shown in fig. 1 to 3, an embodiment of the present invention provides a method for detecting luminance nonuniformity of an Organic Light Emitting Diode (OLED), where the method includes an image acquisition method before a main detection method is performed, and includes the following steps S01 to S03:
step S01, providing a light source L, forming parallel incident light L1 by a first lens group (not shown), and then turning the parallel incident light by a second lens group G, so that the parallel incident light L1 is vertically incident to the pixel P containing the ink I, as shown in fig. 1. Wherein the light source L may be selected from: white light, sodium lamp, laser. In some embodiments of the present invention, the three groups of light sources are different in type, different light sources can be selected in different positions and different modes under different materials, different materials have different absorption degrees to different light sources, different materials have different detection capabilities, and light source selection can be performed according to actual material requirements.
Step S02, capturing the pixel by using a charge-coupled device (CCD) to obtain an image of the pixel with the newton ring, as shown in fig. 2. In some embodiments of the present invention, the CCD of the step S02 shoots the pixel at an angle of 0-2 DEG with the incident direction D1 of the parallel incident light L1 as a symmetry axis, as shown in FIG. 3.
Step S03, converting the image with the newton ring into gray scale to obtain the gray-scale processed image, as shown in fig. 4a and 5.
In the image acquisition method, different light sources form parallel light through the lens group, and the parallel light is vertically emitted into a pixel containing Ink jet printing Ink (Ink) (as shown in fig. 1), because the anode of the top structural device of the OLED display has extremely strong light reflecting capacity, the parallel light forms alternate bright and dark newton rings (as shown in fig. 2) on the surface of the Ink, and the newton rings are contour lines and can reflect the height difference of the Ink, so that the volume difference of the Ink under less volume change is reflected; when the volume difference is large, Newton rings cannot be formed under a certain volume or the number N of the Newton rings cannot be calculated, the Newton rings can be converted into gray scales through a photo, and then judgment is carried out through gray scale comparison.
Referring to fig. 4 a-9, fig. 4a shows an abnormal pixel (when the volume of the ink is greater than or equal to 24 picoliters (pl, 10) according to an embodiment of the present invention-12L), the ink volume of the pixel is 10% larger than that of other pixels) to convert the image with Newton rings into gray scale so as to obtain an image after gray scale processing; FIG. 4b is a diagram illustrating conversion of an image with Newton's rings displayed in normal pixels to gray scale to obtain a gray scale processed image according to an embodiment of the present invention; FIG. 5 is a diagram illustrating conversion of an image with Newton's rings displayed in abnormal pixels (pixels where color mixing occurs during printing) into gray scale to obtain a gray scale processed image according to an embodiment of the present invention; FIG. 6 is a graph showing Newton's Ring offset for an anomalous pixel (a pixel having ink-jet printed ink volumes that deviate from ink volumes of other pixels by 3% to 10%) versus a normal pixel, in accordance with one embodiment of the present invention; FIG. 7 is a graph showing Newton's ring shift for an abnormal pixel (where the ink volume of the ink-jet printed pixel deviates from the ink volume of other pixels by 3% to 10%) compared to a normal pixel, in accordance with one embodiment of the present invention; FIG. 8 is a graph showing the increase in the number of Newton rings for an anomalous pixel (where the ink volume of the pixel is 10% greater than the ink volume of the other pixels when the ink volume of the ink-jet printed is less than 24 pl) compared to a normal pixel, in accordance with one embodiment of the present invention; FIG. 9 is a schematic diagram of an image showing an increase in the number of Newton rings for an abnormal pixel (when the ink volume of the ink-jet printing ink is less than 24pl, the ink volume of the pixel is greater than 10% of the ink volume of the other pixels) compared to a normal pixel, according to one embodiment of the present invention.
As shown in fig. 4a to 9, an embodiment of the present invention provides a method for detecting luminance nonuniformity of an Organic Light Emitting Diode (OLED), where the detecting method includes the following steps S1 to S3:
step S1 is intended to detect that when the ink volume of the ink jet printing ink is greater than or equal to a predetermined value, the ink volume of the pixel is greater than 10% of the ink volume of the other pixels, and that the adjacent pixels are detected with the ink mixing therebetween: referring to fig. 4a, 4b and 5, step S1 includes comparing the position and size of the image of each pixel after gray-scale processing, and screening out the pixels with different positions and sizes of the gray-scale image from the other pixels (as shown in fig. 4 b) as abnormal pixels (as shown in fig. 4a and 5).
According to some embodiments of the invention, the predetermined value is 24 picoliters (pl, 10)-12L)。
In the process of Ink Jet Printing (IJP), a condition in which ink is mixed between adjacent pixels occurs after printing is finished because of poor accuracy of an ink jet printing apparatus or a stable condition of a Nozzle (Nozzle), which is called print color mixing (Bridge), and in this case, the apparatus compares the position and size of a gray level in a pixel by gray level pickup after taking a photograph, thereby judging the cause of the generation of an abnormality.
Step S2 is to detect a pixel in which the ink volume of the inkjet print pixel deviates from the ink volume of other pixels by 3% to 10%: referring to fig. 6 and 7, step S2 includes comparing the position deviation of the newton ring generated in each pixel, and screening the pixel having a position different from the position of the newton ring of the other pixels as an abnormal pixel.
Step S3, aimed at detecting a pixel having an ink volume of greater than 10% of the ink volume of the other pixels when the ink volume of the ink-jet printing ink is less than the predetermined value: referring to fig. 8 and 9, step S3 includes comparing the number N of newton rings generated in each pixel, and screening the pixels with the number N of newton rings different from the other pixels as abnormal pixels.
According to the embodiment of the present invention, in the above-mentioned main detection method, when the pixels are inkjet printed (IJP), the volume ejected from one or some nozzles fluctuates due to the fluctuation of the nozzle stability, and the pixels printed by these nozzles may deviate from the ink volume of other pixels. When the volume deviation of the ink is less than 3%, the difference cannot be analyzed by equipment, and the condition of Mura visible to naked eyes cannot be formed after printing is finished; when the volume deviation is 3% to 10%, the differences are difficult to be identified by contrast when the image is converted into gray scale, but the volume deviation can be identified by analyzing the position offset of the newton ring generated in the pixel image (as shown in fig. 6 and 7); when the volume deviation is greater than 10%, if the volume of the ink-jet printing ink is greater than or equal to 24pl, the volume deviation can be identified by analyzing the position and size of the image of each pixel after the gray-scale processing (as shown in fig. 4a, 4b and 5), and if the volume of the ink-jet printing ink is less than 24pl, the volume deviation can be identified by analyzing the difference of the number N of newton rings generated in the pixel (as shown in fig. 8 and 9). That is, in the method for detecting the luminance unevenness of the OLED, the ink volume of the abnormal pixel is 3% or more of the ink volume of the other pixels.
According to one embodiment of the invention, in the method for detecting the brightness unevenness of the OLED, the detection method is carried out under the condition that the ink of the ink-jet printing pixel is in a wet film state.
According to an embodiment of the present invention, in the method for detecting the luminance unevenness of the OLED, after the step S3, the method further includes: step S4, recovery remanufacturing (Rework): when the abnormal pixel is detected in the state that the ink is wet, ink in all the pixels is removed, the ink jet printing is performed on the pixels again, and the steps S1 to S3 are repeated for the pixels.
According to the method for detecting the uneven brightness of the organic light-emitting diode (OLED), provided by the invention, the display Mura of different degrees is checked when the ink-jet printing ink is in a wet film state, so that pixels causing the display Mura can be effectively detected, and a critical effect is played for ensuring the yield of products; in addition, the development of a recovery and reproduction (Rework) technology in a wet film state is combined, so that the yield of products can be further improved.
Furthermore, the features of the various embodiments may thus be combined in any desired manner to form new embodiments, all such combinations being within the scope of the invention. The described features or characteristics may be combined in any other suitable manner in one or more embodiments. In the above description, certain specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth.
While the above examples are illustrative of the principles of the present invention in one or more applications, it will be apparent to those of ordinary skill in the art that various changes in form, usage and details of implementation can be made without departing from the principles and concepts of the invention. Accordingly, the invention is defined by the appended claims.
Claims (10)
1. A method for detecting uneven brightness of an organic light-emitting diode (OLED) comprises the following steps:
step S1 of detecting that when the ink volume of the ink-jet printing ink is greater than or equal to a predetermined value, the ink volume of one pixel is greater than 10% of the ink volume of the other pixels, and detecting adjacent pixels having ink mixing therebetween, the step S1 including: comparing the position and the size of the image of each pixel after gray scale processing, screening out the pixels with the positions and the sizes of the gray scale images different from the other pixels, and regarding the pixels as abnormal pixels;
step S2 of detecting a pixel in which the ink volume of the inkjet-printed pixel deviates from the ink volume of other pixels by 3% to 10%, the step S2 including: comparing the position deviation situation of the Newton rings generated in each pixel, screening out the pixels with different positions from the Newton rings of other pixels, and regarding the pixels as abnormal pixels; and
a step S3 of detecting a pixel in which an ink volume of the pixel is greater than 10% of ink volumes of other pixels when the ink volume of the ink-jet printing ink is less than the predetermined value, the step S3 including: and comparing the number of the Newton rings generated in each pixel, screening out the pixels with the number different from the number of the Newton rings of the other pixels, and regarding the pixels as abnormal pixels.
2. The method for detecting uneven brightness of an OLED according to claim 1, wherein before step S1, the method further comprises:
in step S01, a light source is provided to form parallel incident light through the first lens group, and the parallel incident light is vertically incident to the pixels containing ink.
3. The method according to claim 2, wherein the light source comprises: white light, sodium lamps, or lasers.
4. The method according to claim 2, wherein in step S01, the parallel incident light is deflected by a second mirror group so that the parallel incident light is incident perpendicularly to the pixels containing ink.
5. The method according to claim 2, wherein after the step S01, the method further comprises:
step S02, capturing the pixel by using a charge-coupled device (CCD) to obtain an image in which the pixel displays the newton ring.
6. The method for detecting uneven brightness of an OLED according to claim 5, wherein in step S02, the pixel is photographed at an angle of 0-2 ° with respect to the symmetry axis, which is the incident direction of the parallel incident light.
7. The method according to claim 5, wherein after the step S02, the method further comprises:
step S03, converting the image with the newton ring into a gray scale to obtain the gray-scale processed image.
8. The method according to claim 1, wherein the detecting is performed in a state that the ink is wet or wet film.
9. The method according to claim 1, wherein after the step S3, the method further comprises:
and step S4, after the abnormal pixel is detected in the state that the ink is in a wet film state, removing the ink in all the pixels through liquid medicine, performing ink-jet printing on the pixels again, and repeating the steps S1 to S3 on the pixels, wherein the liquid medicine comprises one or more of secondary alkyl substituted aromatic hydrocarbon, alkoxy substituted aromatic hydrocarbon, n-alkyl substituted aromatic hydrocarbon, triethylene glycol methyl ether and 2- (benzyloxy) ethanol and is mixed according to a certain proportion.
10. The method according to claim 1, wherein the predetermined value is 24 picoliters (pl, 10)-12L)。
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| CN101858729A (en) * | 2009-04-01 | 2010-10-13 | 精工爱普生株式会社 | The manufacture method of droplet discharge amount measuring method and Organnic electroluminescent device |
| CN107128069A (en) * | 2017-04-28 | 2017-09-05 | 京东方科技集团股份有限公司 | Adjust method, inkjet printing methods, device and its system of inkjet-printing device |
| CN107911602A (en) * | 2017-11-23 | 2018-04-13 | 武汉华星光电半导体显示技术有限公司 | Detection method, detection device and the computer-readable recording medium of display panel Mura |
| CN112599711A (en) * | 2020-12-10 | 2021-04-02 | 深圳市华星光电半导体显示技术有限公司 | Preparation method of OLED device and OLED device |
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