WO2015186306A1 - 表示装置の製造方法 - Google Patents
表示装置の製造方法 Download PDFInfo
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- WO2015186306A1 WO2015186306A1 PCT/JP2015/002585 JP2015002585W WO2015186306A1 WO 2015186306 A1 WO2015186306 A1 WO 2015186306A1 JP 2015002585 W JP2015002585 W JP 2015002585W WO 2015186306 A1 WO2015186306 A1 WO 2015186306A1
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- display device
- luminance
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 230000006866 deterioration Effects 0.000 claims abstract description 30
- 230000002950 deficient Effects 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims description 24
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- 230000004048 modification Effects 0.000 description 22
- 238000012545 processing Methods 0.000 description 14
- 238000005259 measurement Methods 0.000 description 12
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- 238000009792 diffusion process Methods 0.000 description 1
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
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- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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- H10K71/831—Aging
Definitions
- This disclosure relates to a method for manufacturing a display device.
- Patent Document 1 discloses a method for manufacturing an organic light emitting element that easily predicts a change with time in luminance of an organic light emitting device and performs aging.
- a luminance change with time of an organic light emitting element is measured in advance, and the measured luminance change with time is fitted using a luminance reduction equation derived from a chemical reaction equation and a diffusion equation, Find the fitting parameters of the equation.
- a luminance aging deterioration curve indicating luminance aging after the measured time is obtained, and an aging time is calculated based on the luminance aging deterioration curve.
- the organic light emitting device is aged based on the calculated aging time.
- the present disclosure provides a method for manufacturing a display device that discriminates defective products having a short luminance life.
- the display device is lit for a predetermined time, the luminance of the display device is measured as the first luminance at the start of lighting, and the luminance of the display device is set to the second luminance when the predetermined time has elapsed. Measured as luminance, the deterioration rate of the second luminance with respect to the first luminance is calculated, and when the deterioration rate is greater than a threshold value, the display device is determined to be defective.
- the display device manufacturing method can determine a defective product having a short luminance lifetime.
- FIG. 1 is a flowchart illustrating a schematic example of a method for manufacturing a display device according to an embodiment.
- FIG. 2 is a flowchart illustrating an example of a life determination process in which lighting is performed for a predetermined time in the embodiment.
- FIG. 3 is an explanatory diagram showing sample locations for luminance measurement in the embodiment.
- FIG. 4 is a flowchart illustrating a processing example of life determination for performing all lighting for each color in the first modification example of the embodiment.
- FIG. 5 is a flowchart illustrating a processing example of life determination for performing white scroll lighting in the second modification example of the embodiment.
- FIG. 6 is an explanatory diagram of white scroll lighting in the embodiment.
- FIG. 1 is a flowchart illustrating a schematic example of a method for manufacturing a display device according to an embodiment.
- FIG. 2 is a flowchart illustrating an example of a life determination process in which lighting is performed for a predetermined time in the embodiment.
- FIG. 3 is an explan
- FIG. 7 is a flowchart illustrating an example of life determination processing for performing scroll lighting for each color according to the third modification example of the embodiment.
- FIG. 8 is a flowchart illustrating an example of a life determination process for performing color band scroll lighting in the fourth modification example of the embodiment.
- FIG. 9 is an explanatory diagram of color band scroll lighting in the embodiment.
- FIG. 1 is a flowchart illustrating a schematic example of a method for manufacturing a display device according to an embodiment.
- the display device is assembled (S10), the lighting inspection of the assembled display device is performed (S20), the display device is aged (S30), and then the display device is shipped. (S40). Further, in any one of the lighting inspection in step S20 and the aging in step S30, a life inspection is performed to determine a defective product having a short luminance life. That is, since the display device is lit in both the lighting test and the aging, the life test is performed using the lighting time.
- step S20 and the aging in step S30 may be performed as long as a lighting time longer than a certain time required in the life inspection can be secured. If the lighting time in lighting inspection and aging is less than a certain time, a step of performing a life test independently may be performed before step S40.
- the display device is typically an organic EL display device.
- the assembly of the display device in step S10 may be an assembly of a finished product including the outer casing, or some circuits such as the outer casing and the power supply circuit are not mounted but can be displayed by connecting the test apparatus. It may be an assembly of a display panel in a certain state.
- a completed product assembly step may be performed before step S40.
- step S20 it is inspected whether or not a predetermined number or more of the pixels of the display device are lit.
- the aging in step S30 is a so-called running-in operation, and is a step for stabilizing the overall circuit operation for lighting.
- FIG. 2 is a flowchart showing an example of a processing method for determining the lifetime in which lighting is performed for a predetermined time in the embodiment.
- white lighting on the entire screen is started (S1).
- this white lighting all the red, green, and blue pixels are lit simultaneously.
- the luminance in each color pixel may be the maximum luminance or a luminance close to the maximum luminance in order to measure the degree of luminance degradation.
- the luminance of the display device at the start of lighting is measured as the first luminance (S2), and the luminance of the display device is measured as the second luminance when a predetermined time has elapsed (S3: yes) (S4).
- the lighting is finished after the measurement (S5).
- the measurement of the first luminance and the second luminance may be a measurement of the luminance of the entire screen or a luminance measurement of a sample location that is a part of a group of pixels in all the pixels.
- the fixed time is a time during which luminance deterioration as a defective product occurs, and is a time obtained experimentally. This fixed time is, for example, 1 hour, and may be a time between 0.5 hours and 1.5 hours.
- a deterioration rate of the second luminance with respect to the first luminance is calculated (S6).
- This deterioration rate is calculated by, for example, calculation of (first luminance ⁇ second luminance) / (first luminance) ⁇ 100%.
- the display device is determined whether or not the deterioration rate is larger than the threshold value (S7). If it is determined that the deterioration rate is not larger than the threshold value (no in S7), the display device is determined to be a non-defective product. (S8) When it is determined that the deterioration rate is greater than the threshold value (yes in S7), the display device is determined to be defective (S9).
- FIG. 3 is an explanatory diagram showing sample locations for luminance measurement in the embodiment.
- five sample regions A1 to A5 are shown as sample locations for luminance measurement.
- the sample areas A1 to A4 are at positions close to the four corners of the display screen 11.
- the sample area A5 is at a position near the center of the display screen 11. All the sample areas are set to areas where the luminance deterioration is likely to appear remarkably.
- Each of the sample areas A1 to A5 may have a diameter of 1 cm to several centimeters and may have an area equivalent to the light receiving area of the luminance measuring device.
- the luminance measuring device is a photodiode, a phototransistor, a photosensor, an image sensor, or the like, and the luminance may be measured in a state where the luminance measuring device is directly pressed against the surface of the sample region.
- the deterioration rate in step S6 in FIG. 2 may be calculated for each sample region, or an average of the sample regions may be calculated. When the deterioration rate is calculated for each sample region, it can be determined as a defective product in step S7 and step S9 if the deterioration rate is larger than the threshold value in any one sample region.
- FIG. 3 shows five sample areas, any number of sample areas may be used as long as there are one or more sample areas.
- the display device is lit for a certain time, the luminance of the display device is measured as the first luminance at the start of lighting, and the display is performed when the certain time has elapsed.
- the brightness of the device is measured as the second brightness, the deterioration rate of the second brightness with respect to the first brightness is calculated, and when the deterioration rate is greater than a threshold value, the display device is determined to be defective. .
- the display device when the display device is turned on for a certain period of time, the display device may be turned on with the maximum luminance.
- the lighting of the display device for a predetermined time may be lighting in a panel lighting inspection before shipment or lighting in aging before shipment.
- the display device is an organic EL display device having two-dimensionally arranged red pixels, green pixels, and blue pixels.
- the red pixels, The green pixel and the blue pixel may be lit in white by simultaneous lighting.
- the white light is turned on, that is, all the three color pixels are lighted at the same time, the time required for determining the defective product can be shortened.
- the embodiments have been described as examples of the technology in the present disclosure.
- the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
- FIG. 4 is a flowchart showing an example of a life determination process for performing all lighting for each color in the first modification.
- the figure differs from FIG. 2 in that a loop process (steps S0 and S10) for each of red, green and blue colors is added and that step S41 is performed instead of step S1.
- steps S0 and S10 for each of red, green and blue colors is added and that step S41 is performed instead of step S1.
- steps S0 to S10 three loop processes for designating colors in order for the three colors red, green and blue are performed.
- Step S41 turns on the pixels of the designated color on the entire screen.
- the red pixel, the green pixel, and the blue pixel are sequentially switched and lighted on the entire screen for a certain period of time.
- steps S2 and S4 the first luminance and the second luminance are measured for each color.
- step S6 the deterioration rate is calculated for each color.
- step S7 the deterioration rate is determined for each color.
- step S9 when it is determined that any one of the red pixel, the green pixel, and the blue pixel is defective, the life determination process ends. That is, if any one of the colors is determined to be defective, the display device is determined to be defective.
- FIG. 5 is a flowchart showing a processing example of life determination in which a white band having a constant width is turned on in the screen in the second modification.
- the figure differs from FIG. 2 in that steps S51 to S54 are performed instead of steps S1 to S4.
- steps S51 to S54 are performed instead of steps S1 to S4.
- the scroll lighting of a white band with a certain width is started (S51).
- the constant white band all of the red, green, and blue pixels within the fixed width are turned on simultaneously.
- the luminance in each color pixel may be the maximum luminance or a luminance close to the maximum luminance in order to measure the degree of luminance degradation.
- FIG. 6 is an explanatory diagram of white scroll lighting.
- the example of the four display screens 11 in FIG. 6 shows changes over time in scrolling of the white band.
- W1 in the figure indicates a white band having a constant width in the vertical direction.
- the constant width is, for example, a% (for example, 25%) of the total number of pixels in the vertical direction.
- the white band reaches the lowest row.
- the white band is scrolled so as to be divided into two white bands W1a and W1b as shown in the fourth row of FIG.
- the sum of the width of the white band W1a and the width of the white band W1b is the same as that of the white band W1.
- step S52 of FIG. 5 as the first luminance, the luminance of the portion included in the white band is measured. Therefore, the scroll speed may be set to a speed at which luminance measurement can be sufficiently performed. Further, scrolling may be temporarily stopped for luminance measurement.
- step S53 it is determined whether or not all the pixels emit light for a substantially fixed time. That is, when the width of the white band is a% as described above, it is determined whether or not a time of T0 / a% ⁇ 100 has elapsed with respect to the fixed time T0 in the full screen light emission in FIG. For example, when the width of the white band is 25% and the fixed time T0 for full screen light emission in FIG. 2 is 1 hour, the fixed time in step S53 is 4 hours. Also in this case, the substantial lighting time of each pixel is 1 hour.
- step S54 as the second luminance, the luminance of the portion included in the white band is measured.
- the white band is lit in a scrolling manner, and each pixel is lit up for a substantially fixed time. Accordingly, in the white scroll lighting of FIG. 5, each pixel repeats lighting and extinguishing and lighting more dynamically than in FIG. 2, so that the scroll lighting is an operation closer to the actual video display. .
- the life determination in the second modification can improve the accuracy of the determination as compared with FIG.
- FIG. 7 is a flowchart showing an example of a life determination process for performing scroll lighting for each color in the third modification. This figure is different from FIG. 5 in that loop processing (steps S0 and S10) for each of red, green and blue colors is added. Hereinafter, different points will be mainly described.
- steps S0 to S10 three loop processes for designating colors in order for the three colors red, green and blue are performed.
- step S5 Scroll lighting of a color band having a certain width is started for the color designated in step S0 (S51).
- the pixels of the color having the constant width are turned on simultaneously.
- the luminance may be a maximum luminance or a luminance close to the maximum luminance in order to measure the degree of deterioration of the luminance.
- the color band scroll lighting is the same as in FIG. 6 except that the color band is not white but is any color band.
- the life determination in the third modification can improve the accuracy of the determination as compared with FIG.
- FIG. 8 is a flowchart showing an example of a life determination process for performing color band scroll lighting in the fourth modification. This figure differs from FIG. 7 in that the loop processing (steps S0 and S10) is deleted and that steps S81 to S84 are performed instead of steps S51 to S54.
- steps S0 and S10 are deleted and that steps S81 to S84 are performed instead of steps S51 to S54.
- steps S81 to S84 are performed instead of steps S51 to S54.
- FIG. 9 is an explanatory diagram of scroll lighting of three color bands. As shown in the upper part of the figure, the display screen 11 displays three color bands, a red color band R1, a green color band G1, and a blue color band B1. The three color bands scroll from the top to the bottom of the display screen 11 with a certain width.
- step S82 of FIG. 8 as the first luminance, the luminance of the portion included in the color band is measured for each color. Therefore, the scroll speed may be set to a speed at which luminance measurement can be sufficiently performed. Further, scrolling may be temporarily stopped for luminance measurement.
- step S83 it is determined whether or not all pixels emit light substantially for a certain period of time. That is, if the width of the color band is a% of the total number of pixels in the vertical direction, whether or not a time of T0 / a% ⁇ 100 has elapsed with respect to the fixed time T0 in the full screen light emission in FIG. Determine. For example, when the width of the color band is 25% and the fixed time T0 for full screen light emission in FIG. 2 is 1 hour, the fixed time in step S83 is 4 hours. Also in this case, the substantial lighting time of each pixel is 1 hour.
- step S84 for the second luminance, the luminance of the portion included in the color band is measured for each color band.
- the three color bands are turned on by scrolling, and each pixel is turned on for a substantially fixed time.
- each pixel repeats lighting and extinguishing and lighting more dynamically than in FIG. 2, so the scroll lighting is an operation closer to the actual video display. It has become.
- the time required for the life determination can be reduced to 1/3.
- the life determination in the fourth modified example can be performed with higher accuracy in a shorter time than in FIG.
- width of the color band in the third and fourth modifications may be different for each color, or may be the same.
- step S7 the deterioration rate is determined for each of the four types of luminance.
- step S9 if at least one of the four types of luminance is greater than the threshold value, it is determined as a defective product. That's fine.
- step S7 the deterioration rate is determined for each of the four types of luminance.
- step S9 if at least one of the four types of luminance is greater than the threshold value, it is determined as a defective product. That's fine.
- the red pixel, the green pixel, and the blue pixel are sequentially switched over the entire screen. You may light up so that lighting time may become fixed time.
- the deterioration rate can be determined for each color, and the determination accuracy of defective products having a short luminance life can be improved.
- a white band image having a certain width may be scrolled on the screen.
- the scroll display is closer to the actual video display, it is possible to improve the accuracy of determining defective products having a short luminance life.
- a color band image having a certain width for each color of the red pixel, the green pixel, and the blue pixel is scroll-displayed on the screen, and the total lighting time is constant for each pixel. It may be time.
- the light energy increases in descending order, that is, in order of blue, green, red.
- the lighting or deterioration rate may be determined.
- the display device may be a PDP display device or an inorganic EL display device.
- the display device has been described as an example of a display device having two-dimensionally arranged red pixels, green pixels, and blue pixels.
- the display device may be an illumination device that uses an organic EL light emitting element or the like as a light source.
- This disclosure is applicable to display devices.
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Abstract
Description
以下、図面を用いて、実施の形態における表示装置の製造方法を説明する。
[1-1-1.製造方法の概要]
図1は、実施の形態における表示装置の製造方法の概略例を示すフローチャートである。同図における表示装置の製造方法は、表示装置を組み立て(S10)、組み立てた表示装置の点灯検査を行い(S20)、さらに表示装置のエージングを行い(S30)、この後、表示装置を出荷する(S40)。また、ステップS20における点灯検査と、ステップS30におけるエージングとのうちのいずれかのステップにおいて、輝度寿命が短い不良品を判別する寿命検査を行う。つまり、点灯検査においてもエージングにおいても表示装置を点灯させるので、その点灯時間を利用して寿命検査を行うようにしている。ステップS20における点灯検査と、ステップS30におけるエージングとのうちのどちらのステップで行うかは、寿命検査で必要とされる一定時間以上の点灯時間を確保できれば、どちらのステップでもよい。もし、点灯検査およびエージングにおける点灯時間が一定時間に満たない場合は、ステップS40の前に、独立して寿命検査を行うステップを行えばよい。
次に、図1のステップS20、ステップS30、または独立したステップで行われる寿命検査の処理例について詳細に説明する。
次に、第1の輝度および第2の輝度の測定方法について説明する。
以上説明してきたように、本開示における表示装置の製造方法は、表示装置を一定時間点灯させ、点灯開始時に前記表示装置の輝度を第1の輝度として測定し、前記一定時間経過した時に前記表示装置の輝度を第2の輝度として測定し、前記第1の輝度に対する前記第2の輝度の劣化率を算出し、前記劣化率がしきい値よりも大きいとき当該表示装置を不良品と判別する。
上記実施の形態では、表示装置の一定時間(図2ではS2~S4の時間)の点灯(図2ではS1~S5における点灯)において、画面全体で赤色画素、緑色画素および青色画素の同時点灯により白色で、最大輝度で点灯させる例について説明した。輝度の劣化を判定するためには、画素のそれぞれが実質的に一定時間点灯したときの劣化度を算出すればよいので、表示装置の一定時間の点灯は、白色点灯に限らない。第1の変形例では、表示装置の一定時間の点灯において、赤色画素、緑色画素、青色画素を順次切り替えながら全画面で色毎に点灯させる寿命判定について説明する。
第2の変形例では、表示装置の一定時間の点灯において、白色の一定幅の帯を画面内でスクロール点灯させる寿命判定について説明する。
第3の変形例では、表示装置の一定時間の点灯において、色毎に、単色の一定幅の帯を画面内でスクロール点灯させる寿命判定について説明する。
第3の変形例では、色毎の一定幅の帯のスクロール点灯を3回のループ処理によって行ったが、第4の変形例では、色毎の一定幅の帯を同時にスクロール点灯させる寿命判定について説明する。
11 表示画面
A1~A5 サンプル領域
Claims (7)
- 表示装置を一定時間点灯させ、
点灯開始時に前記表示装置の輝度を第1の輝度として測定し、
前記一定時間経過した時に前記表示装置の輝度を第2の輝度として測定し、
前記第1の輝度に対する前記第2の輝度の劣化率を算出し、
前記劣化率がしきい値よりも大きいとき当該表示装置を不良品と判別する
表示装置の製造方法。 - 前記表示装置の一定時間の点灯において、前記表示装置を最大輝度で点灯させる
請求項1に記載の表示装置の製造方法。 - 前記表示装置の一定時間の点灯は、出荷前のパネル点灯検査における点灯、または、出荷前のエージングにおける点灯である
請求項1または2に記載の表示装置の製造方法。 - 前記表示装置は、二次元状に配置された赤色画素、緑色画素、青色画素を有する有機EL表示装置であり、
前記表示装置の一定時間の点灯において、画面全体で前記赤色画素、前記緑色画素および前記青色画素の同時点灯により白色で点灯させる
請求項1~3の何れか1項に記載の表示装置の製造方法。 - 前記表示装置は、二次元状に配置された赤色画素、緑色画素、青色画素を有し、
前記表示装置の一定時間の点灯において、画面全体で前記赤色画素、前記緑色画素および前記青色画素を順次切り替えながら、色毎の点灯時間が一定時間になるように点灯させる
請求項1~3の何れか1項に記載の表示装置の製造方法。 - 前記表示装置は、二次元状に配置された赤色画素、緑色画素、青色画素を有し、
前記表示装置の一定時間の点灯において、白色の一定幅の帯画像を画面内でスクロール表示させ、
画素毎に点灯時間の総和が一定時間になるようにする
請求項1~3の何れか1項に記載の表示装置の製造方法。 - 前記表示装置は、二次元状に配置された赤色画素、緑色画素、青色画素を有し、
前記表示装置の一定時間の点灯において、前記赤色画素、前記緑色画素および前記青色画素の色毎の一定幅の色帯画像を画面内でスクロール表示させ、
画素毎に点灯時間の総和が一定時間になるようにする
請求項1~3の何れか1項に記載の表示装置の製造方法。
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JP2009270870A (ja) * | 2008-05-02 | 2009-11-19 | I Cube Technology:Kk | ディスプレイ検査装置 |
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