WO2015079641A1 - 有機elパネル及びその製造方法、並びにカラーフィルター基板 - Google Patents
有機elパネル及びその製造方法、並びにカラーフィルター基板 Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/18—Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films
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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
- H10K50/80—Constructional details
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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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
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/846—Passivation; Containers; Encapsulations comprising getter material or desiccants
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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
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K50/865—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
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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
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- H—ELECTRICITY
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- 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
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H—ELECTRICITY
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- 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
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/874—Passivation; Containers; Encapsulations including getter material or desiccant
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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
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
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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
- H10K71/50—Forming devices by joining two substrates together, e.g. lamination techniques
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to 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
- 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
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
Definitions
- the present invention relates to an organic EL panel, a manufacturing method thereof, and a color filter substrate.
- an organic EL panel in which an organic EL element is formed on a substrate is becoming widespread, and a large-sized organic EL television is said to be close to commercialization.
- a method of combining a top emission type organic EL element and a color filter (hereinafter referred to as CF) substrate is known. More specifically, an organic EL substrate on which an organic EL element is formed and a CF substrate on which a colored layer is formed are bonded together via a resin layer with the organic EL element and the colored layer facing each other. is there.
- an organic EL element in the top emission type CF system an organic EL element that emits white light and an organic EL element that emits light of each color of R (red), G (green), and B (blue) are arranged in parallel. Some are arranged. In the latter case, the CF substrate is used to increase the color purity of the organic EL element that emits light in each color and to expand the color reproduction range of the organic EL panel.
- An organic EL panel is a self-luminous element and has an advantage of excellent visibility, but an organic EL element has a disadvantage of being weak against moisture. Therefore, when moisture enters from the inside or outside of the panel, a non-light emitting portion (dark spot) may be generated in the display area of the organic EL panel, or the luminance of the display area may be lowered. Therefore, how to remove moisture is important in putting the organic EL panel into practical use.
- the general refractive index of magnesium oxide is higher than the refractive index of the adjacent resin layer, and the difference in refractive index between the moisture adsorption layer and the resin layer is large. Therefore, interface reflection occurs between the moisture adsorption layer and the resin layer, and the light use efficiency is lowered.
- an object of the present invention is to provide an organic EL panel that suppresses deterioration of the utilization efficiency of emitted light while suppressing deterioration of the colored layer of the CF substrate due to heat.
- an organic EL panel includes an organic EL substrate in which an organic EL element is formed on a first substrate, and a color filter substrate in which a colored layer is formed on a second substrate.
- the color filter substrate further includes the above-described colored layer,
- a moisture adsorption layer containing magnesium oxide is formed by vapor deposition on the side facing the resin layer, and the substrate temperature of the second substrate at the time of vapor deposition of the moisture adsorption layer is 200 ° C. or less.
- a moisture adsorption layer containing magnesium oxide obtained by vapor deposition at a substrate temperature of 200 ° C. or lower is used.
- the temperature is 200 ° C. or lower, it is possible to suppress deterioration of a colored layer of a general CF substrate due to heat.
- this makes it possible to reduce the refractive index difference between the moisture adsorption layer and the resin layer as compared with the case of using general magnesium oxide.
- FIG. 1 is a front view showing an organic EL panel 1 according to an embodiment.
- FIG. 3 is a cross-sectional view of the portion indicated by the AA line of the organic EL panel 1 according to the embodiment. It is a figure which shows the substrate temperature of the sample of an Example and a comparative example, various measured values, and the heat resistance of the colored layer in CF. It is a graph which shows the relationship between the substrate temperature of the sample of an Example and a comparative example, refractive index, and (111) intensity
- (A) is a SEM photograph of a magnesium oxide crystal exhibiting a (111) orientation
- (b) is a SEM photograph of a magnesium oxide crystal exhibiting a (100) orientation. It is a graph which shows the relationship between the substrate temperature and ion current of the sample of an Example and a comparative example.
- An organic EL panel includes an organic EL substrate in which an organic EL element is formed on a first substrate, and a color filter substrate in which a colored layer is formed on a second substrate. And an organic EL panel bonded via a resin layer with the colored layer facing each other, wherein the color filter substrate further includes a surface on the colored layer and facing the resin layer.
- a moisture adsorption layer containing magnesium oxide is formed by vapor deposition, and the substrate temperature of the second substrate at the time of vapor deposition of the moisture adsorption layer is 200 ° C. or less.
- the moisture adsorption layer may further contain calcium oxide and / or strontium oxide.
- the magnesium oxide of the moisture adsorption layer may have a (111) orientation.
- an organic EL substrate in which an organic EL element is formed on a first substrate, and a color filter substrate in which a colored layer is formed on a second substrate are the organic EL element and the An organic EL panel that is bonded through a resin layer with the colored layers facing each other, wherein the color filter substrate further includes moisture on the surface of the colored layer facing the resin layer.
- An adsorption layer is formed, the moisture adsorption layer includes magnesium oxide having a refractive index of 1.5 to 1.65 with respect to light having a wavelength of 550 nm, and the refractive index of the moisture adsorption layer with respect to light having a wavelength of 550 nm is It can also be less than 1.72.
- a translucent substrate, a colored layer formed on the translucent substrate, and a moisture adsorption layer containing magnesium oxide formed on the colored layer by vapor deposition
- the substrate temperature of the second substrate at the time of vapor deposition of the moisture adsorption layer may be a color filter substrate having a temperature of 200 ° C. or less.
- an organic EL element is formed on a first substrate to produce an organic EL substrate, and a colored layer is formed on the second substrate, and then magnesium oxide is formed on the colored layer.
- the oxygen concentration in the vapor deposition atmosphere may be 0.02 Pa or more and 0.09 Pa or less during the vapor deposition.
- the inventors of the present invention have intensively studied whether magnesium oxide can be applied to a CF moisture adsorption layer because magnesium oxide is excellent in transparency and moisture adsorption.
- a magnesium oxide having a refractive index lower than that of a conventional general magnesium oxide and close to the refractive index of a resin material generally used for a resin layer is produced. I understood that I could do it. Therefore, the present inventors have invented an organic EL panel that uses this moisture adsorption layer containing magnesium oxide and suppresses deterioration of the utilization efficiency of emitted light while suppressing deterioration of the colored layer of the CF substrate due to heat.
- FIG. 1 is a front view showing an organic EL panel 1 according to one embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the portion indicated by the AA line of the organic EL panel 1 shown in FIG.
- the organic EL substrate 10 and the CF substrate 20 are disposed to face each other, and are bonded together via a resin layer 40.
- the sealing member 30 is arrange
- the organic EL panel 1 is a so-called top emission type, and emitted light is extracted in the + Z-axis direction of FIG.
- pixels Px are arranged in a matrix.
- Organic EL substrate 10 >> The organic EL substrate 10 will be described with reference to FIG.
- the organic EL substrate 10 includes an interlayer insulating film 12, an anode 13, a light emitting layer 15, a cathode 16, and a sealing layer 17 on a TFT substrate 11 on which a TFT (thin film transistor: not shown) element is formed for each pixel Px.
- An organic EL element 50 is provided.
- a bank 14 is formed between the organic EL elements 50 and between the interlayer insulating film 12 and the cathode 16.
- the light emitting layer 15 emits light R (red) for each pixel Px, the light emitting layer 15 (R) emits light G (green), and the light emitting layer 15 (G) B
- the organic EL element 50 having the light emitting layer 15 (B) that emits (blue) light is arranged in parallel.
- the TFT substrate 11 is made of alkali-free glass, soda glass, non-fluorescent glass, phosphate glass, boric acid glass, quartz, acrylic resin, styrene resin, polycarbonate resin, epoxy resin, polyethylene, polyester, silicone resin, It consists of an insulating material such as alumina. A plurality of TFTs and various electrode wirings are formed in a predetermined pattern on the upper surface of the TFT substrate 11.
- the interlayer insulating film 12 is made of polyimide resin or the like, and is formed to insulate the TFT and various electrode wirings from the anode 13 and to flatten the step due to the TFT or the like.
- the anode 13 is made of light such as aluminum, silver, APC (alloy of silver, palladium, copper), ARA (alloy of silver, rubidium, gold), MoCr (alloy of molybdenum and chromium), NiCr (alloy of nickel and chromium), etc. It is made of a reflective conductive material and is formed in a matrix for each pixel Px.
- the bank 14 is made of an insulating organic material (for example, an acrylic resin, a polyimide resin, a novolac type phenol resin, etc.), and is formed so as to avoid a region where the anode 13 is formed.
- the bank 14 according to the present embodiment is a pixel bank including a line-shaped portion extending in the Y direction and a line-shaped portion extending in the X direction.
- the line includes only the line-shaped portion extending in the Y direction. It may be a bank.
- the light emitting layer 15 is formed in a region corresponding to each pixel Px defined by the bank 14, and emits light to R, G, or B by recombination of holes and electrons when the organic EL display panel 1 is driven. .
- the light emitting layer 15 is composed of an organic material. Examples of the organic material include an oxinoid compound, a perylene compound, a coumarin compound, an azacoumarin compound, an oxazole compound, an oxadiazole compound, and a perinone described in JP-A-5-163488.
- the light emitting layer 15 may include any or all of a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer as necessary.
- the cathode 16 is a transparent electrode made of a translucent material such as ITO (indium tin oxide) or IZO (indium zinc oxide), and is formed on the light emitting layer 15.
- ITO indium tin oxide
- IZO indium zinc oxide
- the sealing layer 17 is a layer for covering and sealing the display region and preventing the light emitting layer 15 from coming into contact with moisture, air, etc., and is made of a light transmissive material such as silicon nitride or silicon oxynitride. , Formed on the cathode 16.
- ⁇ CF board 20 The CF substrate 20 will be described with reference to FIG.
- an R, G, B colored layer 22 and a black matrix (hereinafter referred to as BM) layer 23 are formed on a glass substrate 21 (on the main surface side on the organic EL substrate 10 side).
- BM black matrix
- a moisture adsorption layer 24 is formed over almost the entire display area so as to cover them.
- the colored layer 22 is a translucent layer that transmits visible light having a wavelength corresponding to R, G, and B, and is made of a known resin material (for example, a color resist manufactured by JSR Corporation as a commercial product). It is formed in a region corresponding to the pixel Px.
- the BM layer 23 prevents external light from entering the panel, prevents internal components from being seen through the CF substrate 20, and suppresses reflection of external light to improve the contrast of the organic EL panel 1. It is formed for the purpose of letting.
- the material is a black resin, for example, an ultraviolet curable resin material containing a black pigment excellent in light absorption and light shielding properties.
- the BM layer 23 is formed in the display region of the organic EL substrate 10 and the peripheral region of the organic EL substrate 10 (the region surrounding the display region in FIG. 1). However, the display area is formed only in the area corresponding to the portion where the bank 14 is formed. That is, in the display area, the BM layer 23 has a structure including a line-shaped portion extending in the X direction and a line-shaped portion extending in the Y direction.
- the moisture adsorption layer 24 formed on the CF substrate 20 so as to cover the colored layer 22 and the BM layer 23 will be described.
- magnesium oxide that can achieve both transparency and moisture adsorption is used as the moisture adsorption layer 24.
- the moisture adsorption layer 24 may be an alkaline earth metal oxide containing magnesium oxide.
- Illustrative examples include a composite oxide of magnesium oxide and calcium oxide, a composite oxide of magnesium oxide and strontium oxide, and a composite oxide of magnesium oxide, calcium oxide, and strontium oxide.
- the moisture adsorptivity increases in the order of magnesium oxide, calcium oxide, and strontium oxide.
- a mixture of magnesium oxide and resin may be used.
- the film thickness of magnesium oxide that is the moisture adsorption layer 24 is preferably in the range of 0.1 ⁇ m to 10 ⁇ m. When the thickness is 0.1 ⁇ m or more, the moisture adsorptivity is good, and when the thickness is 10 ⁇ m or less, it is possible to suppress cracks from entering the moisture adsorption layer 24.
- the sealing member 30 is a member made of a dense resin material (for example, silicone resin, acrylic resin, or the like) or glass, and a display region of the organic EL substrate 10 is provided between the organic EL substrate 10 and the CF substrate 20. It is provided to surround. Thereby, the display area of the organic EL substrate 10 is sealed to prevent the organic EL element 50 from touching moisture, air, or the like.
- the sealing member 30 is not essential in the organic EL display panel according to one embodiment of the present invention. For example, if a masking tape is used, the sealing member 30 can be omitted.
- the sealing member 30 includes a spacer (not shown) that defines a facing distance between the organic EL substrate 10 and the CF substrate 20.
- the spacer is made of a material such as silica, is formed in a cylindrical shape, a rectangular parallelepiped shape, a spherical shape, or the like, and is arranged in a state where both ends are in contact with the organic EL substrate 10 and the CF substrate 20.
- the CF substrate 20 is formed by sequentially forming the R, G, and B colored layers 22 and the BM layer 23 on the glass substrate 21 by a general photolithography process. Then, a moisture adsorption layer 24 made of magnesium oxide is formed over almost the entire display area by EB (Electron Beam) vapor deposition.
- the temperature of the CF substrate 20 during vapor deposition is set to 200 ° C. or lower in consideration of the heat resistance of the colored layer 22. If the temperature is higher than 200 ° C., the colored layer 22 of the CF substrate 20 cannot withstand heat, and the colored layer 22 deteriorates. Therefore, the upper limit value of the temperature of the CF substrate 20 is 200 ° C.
- the temperature of the CF substrate 20 Although there is no lower limit value for the temperature of the CF substrate 20, it is estimated that the temperature is at least 100 ° C. or higher due to radiant heat during EB deposition without heating. Thus, since it is considered that the substrate temperature reaches at least 100 ° C. in the EB deposition, the moisture adsorption layer 24 cannot be deposited on the organic EL substrate 10 side. This is because the organic EL element 50 deteriorates due to the influence of radiant heat of about 100 ° C. The reason why the temperature of the CF substrate 20 during vapor deposition is set to 200 ° C. or lower is that the colored layer 22 can withstand heat, and the refractive index of the moisture adsorption layer 24 can be lowered.
- the orientation of the crystal lattice of magnesium oxide that is the formed moisture adsorption layer 24 can be made closer to the (111) orientation.
- the crystal layer with (111) orientation is a porous film quality, and the adsorbing ability of moisture and the like is increased accordingly, which is preferable.
- the oxygen concentration in the vapor deposition atmosphere during vapor deposition is preferably 0.02 Pa or more and 0.09 Pa or less. By setting the pressure to 0.02 Pa or more, oxygen can be more efficiently taken into the film, and (111) orientation can be obtained by reducing oxygen defects.
- the sealing member 30 is drawn with a dispenser in the peripheral region of one of the organic EL substrate 10 and the CF substrate 20 prepared so far. Then, the resin layer 40 is formed over almost the entire display area on the organic EL substrate 10.
- the resin layer 40 serves as an adhesive between the organic EL substrate 10 and the CF substrate 20.
- the material is a thermosetting epoxy resin. However, the present invention is not limited to this, and UV curable epoxy resins and other organic materials such as acrylic resins may be used.
- both substrates are bonded together through the resin layer 40.
- the organic EL panel 1 is put in an oven at about 100 ° C. and baked to cure the sealing member 30 and the resin layer 40.
- Comparative Examples 1 to 4 are samples subjected to EB deposition at a substrate temperature higher than the substrate temperature included in the range of the present embodiment (substrate temperature higher than 200 ° C.). Accordingly, the substrate temperatures of Examples 1 and 2 are temperature conditions that the CF colored layer can withstand, and the substrate temperatures of Comparative Examples 1 to 4 are temperature conditions that the CF colored layer cannot withstand.
- FIG. 3 shows the measured values of the refractive index and (111) intensity in each sample, and the heat resistance OK / NG of the colored layer in CF.
- the refractive index is a value for light having a wavelength of 550 nm. All values of refractive index in the present specification are values at this wavelength.
- FIG. 4 is a graph showing the relationship between the substrate temperature, the refractive index, and the (111) intensity.
- the refractive index in Examples 1 and 2, which have a substrate temperature of 200 ° C. or lower that the CF colored layer can withstand, the refractive index is around 1.63.
- the refractive index is around 1.68.
- the refractive index of magnesium oxide is 1.65 at a substrate temperature of 200 ° C. which is the boundary of heat resistance OK / NG of the colored layer in CF. From FIG.
- the refractive index greatly decreases at 200 ° C. or less with the substrate temperature of 200 ° C. as the boundary. Therefore, by setting the substrate temperature to 200 ° C. or less, the refractive index of magnesium oxide can be made 1.65 or less, which is smaller than the conventional general value of 1.72. This is a fact obtained as a result of diligent experiments conducted by the present inventors.
- the refractive index of the resin varies depending on the material, but the average value is considered to be 1.5. The smaller the difference in refractive index between magnesium oxide and resin, the more the interface reflection is suppressed and the lowering of the light utilization efficiency is suppressed. Therefore, by depositing the substrate at a temperature of 200 ° C. or lower, the refractive index is 1.65 or lower, which is lower than the conventional general one, and magnesium oxide close to the average refractive index value of the resin. Can be produced.
- the lower limit value of the refractive index of magnesium oxide may be 1.5, which is the same as that of the resin. In this case, the refractive index difference between magnesium oxide and the resin is zero.
- the lower limit of the refractive index of magnesium oxide is preferably 1.5, which is the same as that of the resin, but 1.62 can be said to be a practical lower limit within the range tested in the present embodiment.
- the (111) intensity is a value measured by a technique of X-ray crystal structure analysis called XRD (X-ray diffraction).
- XRD X-ray diffraction
- FIG. 5A shows the (111) orientation
- FIG. 5B shows the (100) orientation
- the (100) orientation is a state in which the crystal is lying
- the (111) orientation is a state in which the crystal stands up in a columnar shape, and there are many gaps between the columns. For this reason, it is considered that the adsorptivity of moisture and the like is further improved in Example 1 and Example 2 exhibiting the (111) orientation.
- FIG. 6 is a graph showing the relationship between the substrate temperature and the ion current.
- the ion current is a value measured by mass spectrometry called TDS (Thermal Desorption Spectrometry). The higher this value is, the more gas is desorbed. In other words, the gas is contained in the sample by that much. That is, in Example 1 and Example 2 in which the substrate temperature was set to 200 ° C. or lower, it can be seen that the sample contained more water or the like than other samples in which the substrate temperature was higher than 200 ° C.
- the moisture adsorption layer having a refractive index of 1.65 or less can be obtained by setting the substrate temperature at the time of vapor deposition of the moisture adsorption layer containing magnesium oxide to 200 ° C. or less.
- the substrate temperature at the time of vapor deposition of the moisture adsorption layer containing magnesium oxide can be set to 200 ° C. or less.
- the present invention can be used for a CF type organic EL panel.
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Abstract
Description
(実施の形態)
《発明の態様》
本発明の一態様に係る有機ELパネルは、第1基板上に有機EL素子が形成された有機EL基板と、第2基板上に着色層が形成されたカラーフィルター基板とが、前記有機EL素子と前記着色層が対向した状態で、樹脂層を介して貼り合わされている有機ELパネルであって、前記カラーフィルター基板には、さらに、前記着色層上であって前記樹脂層と対向する面側に酸化マグネシウムを含む水分吸着層が蒸着により形成されており、前記水分吸着層の蒸着時における前記第2基板の基板温度は200℃以下であることとする。
本発明者らは酸化マグネシウムが透明性と水分吸着性に優れていることから、酸化マグネシウムをCFの水分吸着層に適用できないかと鋭意、研究を重ねてきた。その結果、基板温度を200℃以下で蒸着することにより、従来の一般的な酸化マグネシウムよりも屈折率が低く、且つ、一般的に樹脂層に用いられる樹脂材料の屈折率に近い酸化マグネシウムを作製できることが分かった。そこで、この酸化マグネシウムを含む水分吸着層を用いることで、CF基板の着色層の熱による劣化を抑えつつ、発光した光の利用効率の低下を抑制した有機ELパネルを発明するに至った。
図1は、本発明の一態様に係る有機ELパネル1を示す正面図である。図2は、図1に示す有機ELパネル1のA-A線で示す部分の断面図である。図2に示すように、有機ELパネル1は、有機EL基板10とCF基板20とが対向配置されており、樹脂層40を介して貼り合わされている。図1に示すように、封止部材30が、有機EL素子が形成された表示領域を囲むように配置されている。有機ELパネル1は所謂トップエミッション型であり、発光した光は図2の+Z軸方向に取り出される。有機ELパネル1の表示領域には画素Pxがマトリクス状に配置されている。
図2を用いて有機EL基板10を説明する。有機EL基板10は、TFT(薄膜トランジスタ:不図示)素子が各画素Px毎に形成されたTFT基板11上に、層間絶縁膜12、アノード13、発光層15、カソード16、及び封止層17からなる有機EL素子50を備える。各有機EL素子50同士の間であって、層間絶縁膜12とカソード16との間にはバンク14が形成されている。また、有機EL基板10は表示領域において、発光層15が各画素Px毎に、R(赤)に発光する発光層15(R)、G(緑)に発光する発光層15(G)、B(青)に発光する発光層15(B)を有する有機EL素子50が並列配置されて構成される。
図2を用いてCF基板20を説明する。CF基板20には、ガラス基板21上に(有機EL基板10側の主面側に)、R、G、Bの着色層22と、ブラックマトリクス(以下、BMと称す。)層23とが形成されている。そして、これらを被覆するように水分吸着層24が表示領域のほぼ全面に亘って形成されている。
封止部材30は、緻密な樹脂材料(例えばシリコーン系樹脂、アクリル系樹脂等)またはガラスからなる部材であって、有機EL基板10とCF基板20との間に有機EL基板10の表示領域を囲むように設けられている。これにより、有機EL基板10の表示領域を封止し有機EL素子50が水分や空気等に触れるのを防止している。尚、本発明の一態様に係る有機EL表示パネルに封止部材30は必須ではなく、例えばマスキングテープを使用すれば封止部材30を省略可能である。
有機EL基板10は、TFT基板11上に有機EL素子50を含む積層構造を一般的な方法で作製する。
本実施の形態に係る水分吸着層24である酸化マグネシウムの効果を調べるべく、CFの着色層が熱に耐えられる上限温度が200℃であることを考慮して蒸着時のガラス基板の温度を変えたサンプルを図3の通り6つ用意した。ここでは簡単のため、着色層やBMのないガラス基板に酸化マグネシウムを単膜で成膜した。実施例1と実施例2は本実施の形態の範囲に含まれる基板温度である200℃以下でEB蒸着したサンプルである。比較例1~比較例4は本実施の形態の範囲に含まれる基板温度より高い基板温度(200℃より高い基板温度)でEB蒸着したサンプルである。従って、実施例1と実施例2の基板温度はCFの着色層が耐えられる温度条件であり、比較例1~比較例4の基板温度はCFの着色層が耐えられない温度条件である。図3には、各サンプルにおける屈折率と(111)強度の測定値、及び、CFにおける着色層の耐熱性のOK/NGを合わせて示した。屈折率は波長550nmの光に対する値である。本明細書中でいう屈折率の値はすべてこの波長における値とする。
10 有機EL基板
11 第1基板
20 CF基板
21 第2基板
22 着色層
24 水分吸着層
40 樹脂層
50 有機EL素子
Claims (9)
- 第1基板上に有機EL素子が形成された有機EL基板と、第2基板上に着色層が形成されたカラーフィルター基板とが、前記有機EL素子と前記着色層が対向した状態で、樹脂層を介して貼り合わされている有機ELパネルであって、
前記カラーフィルター基板には、さらに、前記着色層上であって前記樹脂層と対向する面側に酸化マグネシウムを含む水分吸着層が蒸着により形成されており、
前記水分吸着層の蒸着時における前記第2基板の基板温度は200℃以下であることを特徴とする有機ELパネル。 - 前記水分吸着層は、さらに、酸化カルシウム及び/または酸化ストロンチウムを含むことを特徴とする請求項1に記載の有機ELパネル。
- 前記水分吸着層の酸化マグネシウムは(111)配向をしていることを特徴とする請求項1または2に記載の有機ELパネル。
- 第1基板上に有機EL素子が形成された有機EL基板と、第2基板上に着色層が形成されたカラーフィルター基板とが、前記有機EL素子と前記着色層が対向した状態で、樹脂層を介して貼り合わされている有機ELパネルであって、
前記カラーフィルター基板には、さらに、前記着色層上であって前記樹脂層と対向する面側に水分吸着層が形成されており、
前記水分吸着層は波長550nmの光に対する屈折率が1.5以上1.65以下の酸化マグネシウムを含み、且つ、前記水分吸着層の波長550nmの光に対する屈折率は1.72未満であることを特徴とする有機ELパネル。 - 前記水分吸着層は、さらに、酸化カルシウム及び/または酸化ストロンチウムを含むことを特徴とする請求項4に記載の有機ELパネル。
- 前記水分吸着層の酸化マグネシウムは(111)配向をしていることを特徴とする請求項4または5に記載の有機ELパネル。
- 透光性基板と、
前記透光性基板上に形成された着色層と、
前記着色層上に蒸着により形成された酸化マグネシウムを含む水分吸着層と、を備え、
前記水分吸着層の蒸着時における前記第2基板の基板温度は200℃以下であることを特徴とするカラーフィルター基板。 - 第1基板上に有機EL素子を形成して有機EL基板を作製する工程と、
第2基板上に着色層を形成した後、前記着色層上に酸化マグネシウムを含む水分吸着層を蒸着により形成してカラーフィルター基板を作製する工程と、
前記有機EL基板と前記カラーフィルター基板とを、前記有機EL素子と前記水分吸着層とが対向した状態で、樹脂層を介して貼り合せる工程とを、含み、
前記蒸着時における前記第2基板の基板温度が200℃以下であることを特徴とする有機ELパネルの製造方法。 - 前記蒸着時において、蒸着雰囲気下の酸素濃度は0.02Pa以上0.09Pa以下であることを特徴とする請求項8に記載の有機ELパネルの製造方法。
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