WO2009142450A1 - 유기발광소자용 휘도 향상 편광판 - Google Patents
유기발광소자용 휘도 향상 편광판 Download PDFInfo
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- WO2009142450A1 WO2009142450A1 PCT/KR2009/002704 KR2009002704W WO2009142450A1 WO 2009142450 A1 WO2009142450 A1 WO 2009142450A1 KR 2009002704 W KR2009002704 W KR 2009002704W WO 2009142450 A1 WO2009142450 A1 WO 2009142450A1
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- WIPO (PCT)
- Prior art keywords
- polarizing plate
- organic light
- light emitting
- emitting device
- light
- Prior art date
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- 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
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
Definitions
- the present invention relates to a polarizing plate for an organic light emitting device, and more particularly to a luminance improving polarizing plate developed to significantly improve the brightness of the organic light emitting device.
- An organic light emitting diode refers to a 'self-emitting organic material' that emits light by using an electroluminescence phenomenon that emits light when a current flows through a fluorescent organic compound.
- the organic light emitting diode can be driven at a low voltage, can be made thin, and has a wide viewing angle and a fast response speed. Therefore, unlike an LCD, the image quality does not change even when viewed from the side. This has the advantage that full coloration is possible and it is a material with great potential to become a mainstream product of the next generation flat panel display.
- Such an organic light emitting device is generally formed by sequentially stacking an anode (ITO layer), an electron injection layer, an electron transport layer, an emission layer, a hole transport layer, a hole injection layer and a cathode on a transparent substrate.
- ITO layer an anode
- the electron moves to the light emitting layer with the help of the electron transport layer
- the hole (Hole) from which the electron escaped from the anode moves to the light emitting layer with the help of the hole transport layer.
- Electrons and holes encountered in the light emitting layer which is an organic material, generate excitons having high energy. At this time, the excitons fall to low energy to generate light.
- an organic light emitting diode is a metal of magnesium, magnesium-silver alloy, aluminum, lithium aluminum alloy, calcium, etc. in order to facilitate the injection of electrons and increase the luminous efficiency as a material of the cathode, such a metal electrode Since the surface reflectivity is high, when light outside the light emitting device is incident to the inside, a large amount of the incident light is reflected at the cathode. Such internal reflection has a problem of lowering contrast of OLED and lowering visibility.
- the circularly polarizing plate comprised from a linear polarizing plate and a quarter phase difference plate is used conventionally.
- the contrast can be improved, but the transmittance drops to 45% or less due to absorption of the polarizing plate, thereby reducing the luminance of the organic light emitting device significantly.
- the main factors of the deterioration of luminance include the total reflection effect due to the difference in refractive index of each layer constituting the light emitting device and the polarization phenomenon (polarizer absorption) due to the circularly polarizing plate.
- the light emitted from the light emitting layer of the light emitting device is reduced by the reflection of total reflection such as passing through the hole transport layer, the hole injection layer, the anode, and the transparent substrate, and the luminance is reduced to less than 10% while passing through the circular polarizer, resulting in low emission efficiency.
- a method of optically modifying an internal transmission path of a display device or using a special material for each layer may be considered.
- these methods may reduce process and yield and result in production cost.
- an object of the present invention is to provide a brightness improving polarizing plate for an organic light emitting device that can significantly improve the brightness and contrast ratio of the organic light emitting device.
- the present invention is located between the linear polarizing plate and the quarter retardation plate, the reflection to transmit the polarization component parallel to the transmission axis of the linear polarizing plate, and reflects the polarization component perpendicular to the transmission axis
- a luminance-improving polarizing plate for organic light-emitting device comprising a type polarizing film.
- At least one pressure-sensitive adhesive layer may be present on the upper and lower portions of the reflective polarizing film, wherein at least one of the pressure-sensitive adhesive layer is preferably made of a color correction adhesive to reduce the reflectance of external light.
- the color correction adhesive includes an adhesive resin and a light absorbing agent
- the adhesive resin is acrylic, urethane, polyisobutylene, SBR (styrene-butadiene rubber, styrene-butadiene rubber), rubber, polyvinyl It is an ether type, an epoxy type, a melamine type, polyester type, a phenol type, and silicone type resin, or a copolymer thereof, It is preferable that the said light absorber is a black dye.
- the present invention provides an organic light emitting device display device comprising a polarizing plate for an organic light emitting device made as described above.
- the present invention by applying a reflective polarizing film that can selectively transmit linearly polarized light between the linearly polarizing plate and the 1/4 phase difference plate of the organic light emitting device polarizing plate, the effect of improving the brightness and the brightness is remarkably improved. .
- 1 is a view schematically showing the structure of a conventional organic light emitting device panel.
- FIG. 2 is a view for explaining the progress of light in the conventional organic light emitting device panel.
- FIG. 3 is a view showing the structure of an organic light emitting device panel of the present invention.
- FIG. 4 is a view for explaining the progress of light in the organic light emitting device panel of the present invention.
- FIG. 1 is a view schematically showing a structure of an organic light emitting device to which a conventional circular polarizer is applied
- FIG. 2 is a view for explaining the transmission of light in an organic light emitting device to which a conventional circular polarizer is applied.
- a circularly polarizing plate including a linear polarizing plate 24 and a quarter-phase difference plate 22 to block reflection of external light on the outside of the transparent substrate 11 of the organic light emitting element 10 ( 20) was attached.
- the light 110 incident from the outside passes through the linear polarizing plate 24 and linearly polarizes 120 in a specific direction, and the linearly polarized light 120 is a 1/4 phase difference plate ( 22 is changed into the circularly polarized light 130 while transmitting.
- the circular flat light is reflected by the metal cathode 18, the rotation direction of the circularly polarized light is reversed (140), and transmitted through the 1/4 phase difference plate 22 is converted into linearly polarized light (150).
- the light after passing through the 1/4 phase difference plate becomes a linearly polarized state 150 having a polarization plane perpendicular to the original polarization plane, and thus cannot pass through the linear polarizer 24. It is absorbed so that light cannot be transmitted to the outside (see FIG. 2).
- the light 160 emitted from the light emitting layer of the organic light emitting device also passes through the circular polarizing plate 20, while about 57% of the transmitted light is absorbed and transmitted through the circular polarizing plate 20.
- the amount of light is only about 43%.
- the light emitted from the light emitting layer passes through the hole transport layer, the hole injection layer, the anode, and the transparent substrate before passing through the circular polarizing plate. In this process, light loss occurs due to total reflection due to the difference in refractive index of each layer. In fact, the finally transmitted light becomes very low, less than 10% of the light emitted from the light emitting layer.
- the inventors of the present invention have repeatedly studied to solve the above problems, by applying a reflective polarizing film that selectively transmits linearly polarized light between the linear polarizing plate and the 1/4 retardation plate, and reflects the remaining light, the organic light emitting device
- the present invention was found to be able to significantly improve the brightness of the present invention.
- FIG. 3 schematically shows an organic light emitting device panel to which the luminance-enhanced polarizing plate 30 of the present invention is applied.
- the luminance-improving polarizing plate 30 of the present invention includes a linear polarizing plate 34, a reflective polarizing film 33 and a quarter-phase plate 32, and the linear polarizing plate ( 34), one or more pressure-sensitive adhesive layers 35 may be formed between the reflective polarizing film 33 and the 1/4 phase difference plate 32.
- the linear polarizing plate 34 and the 1/4 phase difference plate 32 used in the present invention are the same as those used in the conventional circular polarizing plate. That is, the linear polarizer and the 1/4 phase difference plate include all arbitrary linear polarizers and quarter phase difference plates used in the art.
- the reflective polarizing film 33 refers to a film that transmits a specific polarization component and reflects the remaining polarization component, such as a wire grid polarizer, an LCD enhancement film, a cholesteric liquid crystal film, and the like. Can be used.
- a polarizing component passing through the linear polarizing plate is transmitted, and the other polarizing component uses a reflective polarizing film that reflects, and may be composed of the above-described film.
- the polarizing plate of the present invention looks at the progress of the light incident from the outside. As shown in FIG. 4, when the amount of light incident on the outside 221 is 100%, about 4% of the light is reflected on the surface of the polarizing plate, and about 96% of the light is reflected on the linear polarizing plate 34. Will pass through. In the process of passing through the linear polarizing plate 34, 53% of the light except for the surface reflection is absorbed by the linear polarizing plate 34, and only about 43% of the light is transmitted and converted into the linearly polarized state (220). The linearly polarized light passes through the reflective polarizing film 33 and then passes through the 1/4 phase difference plate 32.
- the linearly polarized light 260 becomes a linearly polarized light having a polarization plane perpendicular to the original polarization plane, and as a result, the linearly polarized light 260 does not pass through the reflective polarizing film 33 and is reflected (270).
- the reflected light 270 is converted 280 into circularly polarized light while passing through the 1/4 retardation plate 33, and proceeds to the cathode 18, and the direction of rotation of the circularly polarized light is reversed while being reflected from the cathode. 290, and passes through the 1/4 retardation plate 32 in that state.
- the light 300 passing through the 1/4 retardation plate 32 is in a polarization state capable of transmitting the reflective polarizing film, the light is transmitted through the reflective transmissive film 33 and the linear polarizing plate 32 in order to the outside. Will be extracted. In this process, a large portion of the external light is absorbed by each layer and the polarizing plate of the organic light emitting device, and approximately 15% of the total external light amount is extracted to the outside.
- the light emitted from the light emitting layer passes through the 1/4 phase difference plate 32 through the respective layers of the organic light emitting device to reach the reflective polarizing film 33.
- the reflective polarizing film 33 some light is transmitted 410, and some light is reflected 420 to pass through the 1/4 retardation plate 32 again. Since the light 410 transmitted through the reflective polarizing film 33 may pass through the linear polarizing plate 34, the light 410 is transmitted through the linear polarizing plate 34 to be emitted to the outside.
- the light 420 reflected from the reflective polarizing film is converted 430 into circularly polarized light while passing through the 1/4 phase difference plate, and passes through the respective layers of the organic light emitting diode, and then is reflected by the cathode 18 of the metal material. Will be.
- the rotation direction of the circularly polarized light is reversed while being reflected (440), and the circularly polarized light is passed through the respective layers of the organic light emitting device and then converted into linearly polarized light while passing through the 1/4 phase difference plate 32 (450).
- the linearly polarized light 450 generated after passing through the 1/4 retardation plate 32 becomes a polarization state capable of passing through the reflective polarizing film. Therefore, the reflective polarizing film and the linear polarizing plate are sequentially transmitted to be emitted to the outside. In this case, since the light emitted from the light emitting layer can be emitted in theory 100%, it is possible to significantly improve the brightness of the organic light emitting device.
- the polarizing plate of the present invention when used, not only the extraction efficiency of the light emitted from the light emitting layer can be significantly improved, but also the light incident from the outside is maximized to be absorbed in each layer of the linear polarizing plate, thereby minimizing reflection. As compared with the related art, the light utilization efficiency and luminance can be significantly improved.
- the present invention may be made by including a pressure-sensitive adhesive layer made of a color correction pressure-sensitive adhesive to reduce the reflectance of external light on the upper or lower portion of the reflective polarizing film.
- the color correction adhesive means an adhesive having a function of absorbing a predetermined amount of light with respect to the entire wavelength of the visible light region, and may include a light absorbing agent absorbing light in the visible light region in the adhesive resin.
- the adhesive resin may be a pressure-sensitive resin commonly used in the art, that is, a pressure-sensitive resin used in a general pressure-sensitive adhesive sheet (sheet), pressure-sensitive adhesive film, etc., may be any one that does not limit the transmission of light, it is particularly limited It doesn't work.
- the adhesive resin may be acrylic, urethane, polyisobutylene, SBR (styrene-butadiene rubber), rubber, polyvinyl ether, epoxy, melamine, polyester, phenol or silicone resin or Copolymers thereof and the like can be used, and acrylic adhesives are particularly preferable.
- dye is mainly used as the light absorber.
- the dye that can be used include, but are not limited to, a black dye, and the dye may be used without particular limitation, as long as it is dissolved in an organic solvent and has good transparency. It is also possible to substitute the black dye by mixing dyes other than black dye.
- the content of the light absorbing agent contained in the adhesive resin is preferably about 0.001 to 1 parts by weight based on 100 parts by weight of the adhesive resin. If the content of the light absorbing agent is less than 0.001 part by weight, color correction characteristics do not appear.
- the light absorbing agent may be used without limitation as long as it has an absorption wavelength of the gamma ray region, preferably around 550nm, that is, 450nm to 650nm wavelength, more preferably 500nm to 600nm wavelength of the center of the visible light region It is preferable to use a single black dye that is widely absorbed or a mixture of colored dyes.
- the black single dye may be sufficient and it is suitable if it is a dye structure which has a wide absorption wavelength of a mixed form.
- the specific wavelength region expressed in the organic light emitting diode is preferably not absorbed, and the specific wavelength region is It is more preferable if the visible light having a wavelength other than that can be absorbed.
- the visible light having a wavelength other than that can be absorbed if there is a dye that can absorb more visible light regions other than the R, G, and B specific regions of the organic light emitting diode, the light transmission of the organic light emitting diode can be effectively increased, and a certain level of absorption can be achieved even with external light. Therefore, it is very useful as a color correction dye for pressure-sensitive adhesives.
- a transmission spectrum capable of absorbing relatively many wavelengths near the 500 nm and 580 nm wavelengths may be removed.
- a dye having an absorption wavelength region near 500 nm wavelength for example 480-520 nm, more preferably 490-500 nm, and near 580 nm wavelength, for example 570-600 nm, more preferably 580-590 nm Dye having an absorption wavelength range can be mixed and used.
- the pressure-sensitive adhesive layer is formed by using the color-correcting pressure-sensitive adhesive mixed with the above dye, it is possible to change the overall transmittance of the organic light emitting device, thereby controlling the degree of light transmission and reflection of external light, thereby improving the brightness of the light and There is an advantage that can contribute to maintaining visibility.
- the pressure-sensitive adhesive layer is formed by using the color correction pressure-sensitive adhesive including an absorber that absorbs light, there is an advantage that the contrast can be further improved by absorbing the internal reflection light in the pressure-sensitive adhesive layer.
- the 140 nm retardation film COP polymer stretched film having regular dispersion characteristics
- a reflective polarizing film (luminance enhancement film, 3M) capable of transmitting a specific linear polarization with 50% transmittance was attached to the lower part.
- a 140 nm retardation film (a COP polymer stretched film having regular dispersion characteristics) of 1/4 wavelength was attached on the color correction adhesive layer to prepare a brightness improving polarizing plate of the present invention, and then manufactured the organic polarizing element panel (2.2). Inch active OLED panel).
- a conventional circular polarizer composed of a general linear polarizer plate laminated with a TAC protective film and a 1/4 wavelength 140 nm retardation film (a COP polymer stretched film having a dispersion property) was attached to the upper and lower parts of the PVA device.
- Luminance is the result of obtaining the amount of light emitted when driving each OLED panel in spectral form for each wavelength, and when the amount of light of the organic light emitting device panel (Comparative Example 1) without polarizer in parenthesis is set to 100% The luminance ratio of was described.
- the reflectance was measured by using a UV spectrum measuring device to measure the degree of reflection from the front of each OLED panel, and in the parenthesis when the reflectance of the organic light emitting device panel (Comparative Example 1) without a polarizing plate was set at 100%.
- the reflectance ratio of was described.
- Example 2 in which the pressure-sensitive adhesive layer is formed, it can be seen that the reflectance is good at a level of 15%. That is, when using the polarizing plate of the present invention, it can be seen that both the brightness and contrast ratio of the organic light emitting device can be improved.
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Abstract
Description
휘도, cd/A (%) | 반사율, AU (%) | |
비교예 1 | 19.8(100) | 69.40(100) |
비교예 2 | 8.6(43.4) | 3.76(5.4) |
실시예 1 | 15.7(79.3) | 26.03(37.5) |
실시예 2 | 12.8(64.6) | 10.81(15.6) |
Claims (9)
- 선 편광판 및 1/4 위상차판을 포함하여 이루어지는 유기발광소자용 편광판에 있어서,상기 선 편광판과 1/4 위상차판 사이에 위치하며,상기 선편광판의 투과축과 평행한 편광은 투과시키고, 상기 선편광판의 투과축과 수직인 편광은 반사시키는 반사형 편광 필름을 포함하는 것을 특징으로 하는 유기발광소자용 휘도 향상 편광판.
- 제1항에 있어서,상기 유기발광소자용 휘도 향상 편광판은 상기 반사형 편광 필름의 상부 및 하부에 적어도 하나의 점착체층을 포함하며,상기 점착제층들 중 적어도 하나는 외광의 반사율을 감소시키기 위한 색 보정 점착제로 이루어지는 것을 특징으로 하는 유기발광소자용 휘도 향상 편광판.
- 제2항에 있어서,상기 색 보정 점착제는 점착성 수지 및 광 흡수제를 포함하는 것을 특징으로 하는 유기발광소자용 휘도 향상 편광판.
- 제3항에 있어서,상기 광 흡수제는 점착성 수지 100중량부에 대하여 0.01 내지 1 중량부의 함량으로 포함되는 것을 특징으로 하는 유기발광소자용 휘도 향상 편광판
- 제3항에 있어서,상기 점착제 수지는 아크릴계, 우레탄계, 폴리이소부틸렌계, SBR(스티렌-부타디엔 러버, styrene-butadiene rubber)계, 고무계, 폴리비닐에테르계, 에폭시계, 멜라민계, 폴리에스테르계, 페놀계 및 실리콘계 수지 및 이들의 공중합체로 이루어진 군으로부터 선택되는 것을 특징으로 하는 유기발광소자용 휘도 향상 편광판.
- 제3항에 있어서,상기 광 흡수제는 블랙 염료인 것을 특징으로 하는 유기발광소자용 휘도 향상 편광판.
- 제6항에 있어서,상기 블랙 염료는 흡수 파장 영역이 500nm 내지 600nm인 것을 특징으로 하는 유기 발광 소자용 휘도 향상 편광판.
- 제3항에 있어서,상기 광 흡수제는 490nm 내지 500nm의 흡수 파장 영역을 갖는 염료와 580 내지 590nm의 흡수 파장 영역을 갖는 염료를 혼합하여 사용하는 것을 특징으로 하는 유기발광 소자용 휘도 향상 편광판.
- 청구항 1 내지 8 중 어느 한 항에 기재된 휘도 향상 편광판을 포함하는 것을 특징으로 하는 유기발광소자 표시장치.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2009801053200A CN101946195B (zh) | 2008-05-22 | 2009-05-22 | 用于有机发光元件的提高亮度的偏振板 |
US12/866,193 US8338823B2 (en) | 2008-05-22 | 2009-05-22 | Luminance-enhancing polarising plate for an organic light-emitting element |
JP2010546713A JP2011512558A (ja) | 2008-05-22 | 2009-05-22 | 有機発光素子用輝度向上偏光板 |
US13/708,700 US8969857B2 (en) | 2008-05-22 | 2012-12-07 | Luminance-enhancing polarising plate for an organic light-emitting element |
US13/708,634 US8759864B2 (en) | 2008-05-22 | 2012-12-07 | Luminance-enhancing polarising plate for an organic light-emitting element |
Applications Claiming Priority (4)
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KR20080047717 | 2008-05-22 | ||
KR10-2008-0047717 | 2008-05-22 | ||
KR1020090044511A KR101106294B1 (ko) | 2008-05-22 | 2009-05-21 | 유기발광소자용 휘도 향상 편광판 |
KR10-2009-0044511 | 2009-05-21 |
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US12/866,193 A-371-Of-International US8338823B2 (en) | 2008-05-22 | 2009-05-22 | Luminance-enhancing polarising plate for an organic light-emitting element |
US13/708,700 Continuation US8969857B2 (en) | 2008-05-22 | 2012-12-07 | Luminance-enhancing polarising plate for an organic light-emitting element |
US13/708,634 Continuation US8759864B2 (en) | 2008-05-22 | 2012-12-07 | Luminance-enhancing polarising plate for an organic light-emitting element |
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WO2009142450A1 true WO2009142450A1 (ko) | 2009-11-26 |
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JP2011175260A (ja) * | 2010-02-24 | 2011-09-08 | Samsung Mobile Display Co Ltd | 偏光板及びこれを備える有機発光装置 |
WO2012026536A1 (ja) * | 2010-08-27 | 2012-03-01 | 住友化学株式会社 | 表示装置およびその製造方法 |
US9381238B2 (en) | 2010-11-05 | 2016-07-05 | University Of Dundee | Method for improving the production of influenza viruses and vaccine seeds |
CN113820779A (zh) * | 2021-08-30 | 2021-12-21 | 华为技术有限公司 | 偏光片及其制备方法、显示面板 |
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US20030161136A1 (en) * | 2002-02-28 | 2003-08-28 | O'connor Michael | Polarization conversion system |
JP2004205702A (ja) * | 2002-12-24 | 2004-07-22 | Toshiba Matsushita Display Technology Co Ltd | 表示装置およびモバイル装置 |
US20070147066A1 (en) * | 2005-12-28 | 2007-06-28 | 3M Innovative Properties Company | Lighting device including customized retarder and display device including same |
US20070285000A1 (en) * | 2004-09-10 | 2007-12-13 | Luminus Devices, Inc. | Polarization recycling illumination assembly and methods |
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US20030161136A1 (en) * | 2002-02-28 | 2003-08-28 | O'connor Michael | Polarization conversion system |
JP2004205702A (ja) * | 2002-12-24 | 2004-07-22 | Toshiba Matsushita Display Technology Co Ltd | 表示装置およびモバイル装置 |
US20070285000A1 (en) * | 2004-09-10 | 2007-12-13 | Luminus Devices, Inc. | Polarization recycling illumination assembly and methods |
US20070147066A1 (en) * | 2005-12-28 | 2007-06-28 | 3M Innovative Properties Company | Lighting device including customized retarder and display device including same |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011175260A (ja) * | 2010-02-24 | 2011-09-08 | Samsung Mobile Display Co Ltd | 偏光板及びこれを備える有機発光装置 |
WO2012026536A1 (ja) * | 2010-08-27 | 2012-03-01 | 住友化学株式会社 | 表示装置およびその製造方法 |
JP2012049010A (ja) * | 2010-08-27 | 2012-03-08 | Sumitomo Chemical Co Ltd | 表示装置 |
US9381238B2 (en) | 2010-11-05 | 2016-07-05 | University Of Dundee | Method for improving the production of influenza viruses and vaccine seeds |
CN113820779A (zh) * | 2021-08-30 | 2021-12-21 | 华为技术有限公司 | 偏光片及其制备方法、显示面板 |
CN113820779B (zh) * | 2021-08-30 | 2023-03-10 | 华为技术有限公司 | 偏光片及其制备方法、显示面板 |
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