JP4552424B2 - Manufacturing method of full-color organic EL display panel - Google Patents

Description

  The present invention relates to a color organic EL (electroluminescence) display panel, and more particularly to a full-color organic EL display panel having an excellent light emission lifetime free from obstacles caused by color filters and a method for manufacturing the same.

  An EL (electroluminescence) element having a self-luminous function has high visibility, can reduce the structure of a light-emitting device, and can be used for a flexible substrate. At present, inorganic and organic compounds are used as a light-emitting layer. A display using various EL elements used has been proposed. An example of the proposal is a full-color organic EL display.

  As one of the colorization techniques for this full-color organic EL display, a panel structure is proposed in which a white light-emitting EL element is used as a light source and three primary color (red, green, and blue) color filters are installed.

  For example, in Japanese Patent Application Laid-Open No. 64-40888, as shown in FIG. 1, an organic material layer (a material layer sandwiched between a first electrode (2) and a transparent second electrode (4) on a support substrate (1) ( 3), and a color filter (7) provided on the support substrate (8) with the EL light extracted through the transparent second electrode (4) facing the transparent second electrode (4) A color EL display is disclosed in which it is taken out of the support substrate (8) through the substrate.

  However, in the color EL display, since the EL element and the color filter face each other, gas such as water vapor, oxygen or an organic monomer, a low molecular component, etc. is generated from the color filter, which is a cause of reducing the light emission lifetime of the EL element. It was.

  As a means for correcting this problem, for example, in Japanese Patent Laid-Open No. 10-12383, as shown in FIG. 2, a method for forming a flattening layer (6) and a passivation layer (5) on the color filter (7) is shown. Has been proposed.

However, when the flattening layer (6) is formed on the pixel-like color filter (7), microprojections are formed on the surface of the flattening layer (6), and foreign matters in the process are mixed. Thus, it has been unavoidable that the light emission lifetime of the EL element is lowered.
Japanese Unexamined Patent Publication No. 64-40888 Japanese Patent Laid-Open No. 10-12383

  The present invention has been devised in view of the above problems. In a color EL display panel that uses a white light-emitting EL element as a light source and extracts color light through three color filters (red, green, and blue), It is an object of the present invention to provide a full-color organic EL display panel that does not reduce the light emission lifetime of an EL element, that is, has an excellent light emission lifetime, and a method for manufacturing the same.

The present invention also provides a pixel-like white organic EL element composed of a first electrode, an organic material layer made of a polymer light emitting material, and a second electrode, and a pixel-like color filter corresponding to the white organic EL element. And manufacturing a full-color organic EL display panel that displays a color, and Ch-LCP (cholesteric liquid crystal polymer) is used as a base material of the color filter, and the pixel of the color filter is the Ch-LCP. A pixel whose transmitted light color is set by adjusting and fixing the spiral pitch of the pixel, and a plurality of pixels set to different transmitted light colors. The white organic EL element and the color filter A passivation film made of silicon oxide or silicon nitride is provided therebetween, so that the passivation film is in contact with the color filter. Made is, the method of manufacturing a full-color organic EL display panel, wherein the white organic EL device on the passivation film is formed so that the contact, full-color organic EL display and performing step 1) to 7) below in order It is a manufacturing method of a panel.
1) A step of flatly forming a Ch-LCP layer with a desired film thickness on a support substrate;
2) As transmitted light color of the Ch-LCP layer exhibits a blue color, by adjusting the helical pitch of the Ch-LCP layer by temperature, the by UV or EB exposure through a mask having an opening corresponding to the pixel Curing the Ch-LCP layer to fix the helical pitch and forming a blue pixel of a color filter in which the transmitted light color is set to blue;
3) of the blue pixel is the Ch-LCP layer formed as transmitted light color in the portion other than the blue pixel exhibits a green to adjust the helical pitch of the Ch-LCP layer with temperature, adjacent to the blue pixel by curing the Ch-LCP layers to secure the helical pitch by UV or EB exposure through a mask having an opening corresponding to the pixel to pixel positions, green pixels of the color filters to set the transmitted light color to green Forming step,
4) of the blue pixel and the Ch-LCP layer green pixels are formed, as transmitted light color in the portion other than the blue pixel and green pixel exhibits red, adjusting the helical pitch of the Ch-LCP layer by temperature and, by curing the Ch-LCP layers to secure the helical pitch by UV or EB exposure through a mask having an opening corresponding to the pixel to pixel position adjacent to the green pixel, and sets the transmitted light color to red Forming a red pixel of the color filter;
5) the blue pixel, green pixel, and red pixel are not formed step of fixing the helical pitch of the portion of the Ch-LCP layer,
6) A step of providing a passivation film made of silicon oxide or silicon nitride on the Ch-LCP layer by a sputtering method or a plasma CVD method ,
7) A step of forming a pixel-like white organic EL element made of a polymer light emitting material on the passivation film.

  By forming a color filter using Ch-LCP (cholesteric liquid crystal polymer) on the support substrate, the surface of the color filter becomes flat, and a flattening layer becomes unnecessary. In addition, by providing a passivation film over the color filter, the influence of moisture and the like can be prevented. Therefore, a full color organic EL display panel having an excellent light emission lifetime is obtained.

  Hereinafter, a full color organic EL display panel according to the present invention and a method for manufacturing the same will be described in detail based on an embodiment thereof.

  In the full color organic EL display panel according to the present invention, since the Ch-LCP (cholesteric liquid crystal polymer) is used as the base material of the color filter, the surface of the color filter is formed flat. The color filter is composed of a pixel portion having a specific transmitted light color and a portion between pixels not having the specific transmitted light color, and both portions have the same thickness.

  Therefore, the planarization layer becomes unnecessary and no fine protrusion is generated. As a result, a decrease in the light emission lifetime of the EL element due to the minute protrusions is prevented.

  In addition, the full color organic EL display panel according to the present invention uses Ch-LCP as the base material of the color filter, uses selectively transmitted light due to the spiral structure of Ch-LCP as color light, and has red, green, and blue color lights. A pixel is provided corresponding to each pixel electrode of the white organic EL element.

  FIG. 3 is a cross-sectional view showing an embodiment of a full color organic EL display panel according to the present invention. As shown in FIG. 3, the full-color organic EL display panel includes a first electrode (2), an organic material layer (3), a transparent second electrode (4), a passivation film (5), Ch on a support substrate (1). A Ch liquid crystal color filter 1 (21 ′), a Ch liquid crystal color filter 2 (22 ′), and a support substrate (8) formed using -LCP are sequentially provided. An optical film (9) is also provided on the support substrate (8) of the full color organic EL display panel.

  A characteristic required for Ch-LCP that can be used as a base material of a color filter is that the layer is formed on a supporting substrate to have a desired thickness in a state without flat projections. Further, the helical pitch of Ch-LCP has temperature dependence, and further exhibits a photocuring reaction by light irradiation.

  The cholesteric liquid crystal having the helix-forming ability of Ch-LCP includes a chiral compound containing an optically active component for the purpose of introducing a helical structure into the cholesteric liquid crystal, nematic liquid crystal or smectic C liquid crystal having the cholesteric helix-forming ability in the molecule itself. A nematic liquid crystal or a chiral smectic liquid crystal composition may be used.

  Representative examples of the Ch-LCP include an optically active group in the polymer main chain, for example, polyester, polypeptide, polyimide, polyamide, polycarbonate, polyesterimide, cellulose, or the like in the polymer side chain. Examples of the optically active group include polyacrylate, polymethacrylate, polymalonate, and polysiloxane.

  Further, a group-containing nematic liquid crystal derivative having a chiral moiety such as 2-methylbutyl group, 2-methylbutoxy group, 4-methylhexyl group as a terminal group of chiral nematic liquid crystal, for example, 4-cyano-4 ′-(2-methylbutyl ) Biphenyl, 4-cyano-4 ′-(2-methylbutoxy) biphenyl, 4-cyano-4 ′-(4-methylhexyl) terphenyl, and the like.

  Furthermore, 4- (4-n-heptyloxyphenyl) benzoic acid-2-methylbutyl ester, 4- (4-methylhexyloxy) benzoic acid-4'-n-, which produces selective reflection characteristics in a chiral smectic liquid crystal Examples also include heptyloxyphenyl ester.

In the case of a cholesteric liquid crystal having the ability to form a cholesteric helix in the molecule itself, the reactive liquid crystal composition is introduced into the molecule itself, and in the case of a multi-component liquid crystal mixture, it is introduced as a reactive group into at least one component. The initiator is added so that this reactive group reacts by light irradiation.

  As the nematic liquid crystal constituting the cholesteric liquid crystal composition, 4-substituted benzoic acid-4′-substituted phenyl ester, 4-substituted cyclohexanecarboxylic acid-4′-substituted phenyl ester, 4-substituted cyclohexanecarboxylic acid-4′- Substituted biphenyl ester, 4- (4-substituted cyclohexanecarbonyloxy) benzoic acid-4′-substituted phenyl ester, 4- (4-substituted cyclohexylsyl) benzoic acid-4′-substituted phenyl ester, 4- (4-substituted cyclohexyl) Lucyl) benzoic acid-4′-substituted cyclohexyl ester, 4-substituted-4′-substituted biphenyl, 4-substituted phenyl-4′-substituted cyclohexane, 4-substituted-4′-substituted terphenyl, 4-substituted biphenyl-4 ′ -Substituted cyclohexane, 2- (4-substituted phenyl) -5-substituted pyrimidine and the like.

  Examples of smectic C liquid crystals constituting the cholesteric liquid crystal composition include 4- (4-n-hexyloxyphenyl) benzoic acid, 4-n-octyloxybenzoic acid-4′-n-heptyloxyphenyl ester, 5 -N-octyl-2- (4-n-octyloxyphenyl) pyrimidine and the like.

  The cholesteric liquid crystal composition forms a coating liquid of the cholesteric liquid crystal composition, for example, spinless coating method, ink jet method, dip coating method, doctor blade method, discharge coating method, spray coating method, letterpress printing method, intaglio printing method It is possible to form a film by a wet process such as a screen printing method or a micro gravure coating method. In addition, a leveling agent, an additive, or the like may be added as an improving material such as a coating liquid coating performance.

  In the present invention, the passivation layer can be formed of a silicon compound such as silicon oxide (SiOx) or silicon nitride (SiNy), but silicon oxide alone, silicon nitride alone, silicon nitride oxide film, or silicon oxide simple film And a multilayer film of a single silicon nitride film.

  In addition, it is preferable that the said passivation layer has the transmittance | permeability which permeate | transmits 80% or more of the light emitted from the organic light emitting layer.

  Moreover, in order to form the said passivation layer, sputtering method, plasma CVD method, etc. can be used.

  Further, a protective film can be formed on the passivation layer with an organic transparent resin or an inorganic transparent resin in order to protect the destruction of the passivation layer formed in the subsequent process.

  As the EL light emitting material, known light emitting materials for organic EL elements can be used.

Examples of the low-molecular light emitting material include aromatic dimethylidene compounds such as 4,4′-bis (2,2′-diphenylvinyl) -biphenyl (DPVBi), 5-methyl-2- [2- [4- (5 Oxadiazole compounds such as -methyl-2-benzoxazolyl) phenyl] vinyl] benzoxazole, 3- (4-biphenylyl) -4-phenyl-5-t-butylphenyl-1,2,4-triazole Fluorescence of triazole derivatives such as (TAZ), styrylbenzene compounds such as 1,4-bis (2-methylstyryl) benzene, thiopyrazine dioxide derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, diphenoquinone derivatives, fluorenone derivatives, etc. Organic material, azomethine zinc complex, (8-hydroxyquinolinato) , And the like aluminum complex (Alq3) fluorescent organic metal compound such.

  Examples of the binding resin include polycarbonate and polyester. The solvent may be any solvent that can dissolve or disperse the light emitting material, and examples thereof include pure water, methanol, ethanol, THF, chloroform, toluene, xylene, trimethylbenzene, and a mixed solution thereof. .

  On the other hand, as a polymer light-emitting material, poly [2,5-bis- [2- (N, N, N-triethylammonium) ethoxy] -1,4-phenyl-alt-1,4-phenyllene] dipromide ( PPP-NEt3 +), poly (2-decyloxy-1,4-phenylene) DO-PPP, poly [5-methoxy- (2-propanoxysulfonide) -1,4-phenylenevinylene] (MPS-PPV), Poly [2,5-bis- (hexyloxy) -1,4-phenylene- (1-cyanovinylene)] (CN-PPV), poly [2- (2′-ethylhexyloxy) -5-methoxy-1, 4-phenylene vinylene] (MEH-PPV), (poly (9,9-dioctylfluorene)) (PDAF), and the like. Examples of the precursor of the polymer light-emitting material include For example, a PPV precursor, a PNV precursor, a PPP precursor, etc. can be mentioned.

As an organic material layer between the 1st electrode layer and 2nd electrode layer which comprises an organic EL element, a single layer structure or a multilayer structure may be sufficient, and the following structures can be mentioned.
1. 1. Organic light emitting layer 2. hole transport layer / organic light emitting layer 3. Organic light emitting layer / electron transport layer 4. hole transport layer / organic light emitting layer / electron transport layer 5. Hole injection layer / hole transport layer / organic light emitting layer / electron transport layer Hole injection layer / hole transport layer / organic light emitting layer / blocking layer / electron transport layer The charge transport layer such as the hole injection layer, the hole transport layer, and the electron transport layer may be a single layer or a multilayer. It may be a structure. Here, as the charge transport material, known charge transport materials for organic EL elements and organic photoconductors can be used.

  The charge transport layer can be formed by a conventional method, and the charge transport material can be directly formed by a dry process such as a vacuum evaporation method, an EB method, an MBE method, or a sputtering method. Alternatively, using a coating solution for forming a charge transport layer, spin coating method, dip coating method, doctor blade method, discharge coating method, spray coating method, ink jet method, letterpress printing method, intaglio printing method, screen printing method, micro It is also possible to form a film by a wet process such as a gravure coating method. It is a solution containing at least a charge transport material, and may contain one or more kinds of charge transport materials, and may further contain a binding resin. Moreover, a leveling agent, other additives, etc. may be added.

  In order to improve the viewing angle, visibility, and brightness, various optical functional layers can be used on the opposite side of the color filter using Ch-LCP as a base material with a glass substrate interposed therebetween. In order to improve the viewing angle, WV film, VA mode optical compensation film, IPS mode optical compensation film, OBC mode optical compensation film and the like can be mentioned. In order to improve visibility, AG film, AR film and LR In order to improve the brightness, a multilayer film of refractive index anisotropic thin film or a cholesteric liquid crystal laminated ¼λ plate can be used. Moreover, combined use of a 1/4 wavelength phase difference film and a 1/2 wavelength phase difference film is also mentioned as a polarizing plate.

  Hereinafter, the present invention will be described in more detail with reference to Example 1. However, the present invention is not limited to the embodiments.

  4 (1) to 4 (4) and FIGS. 5 (1) to 5 (5) are explanatory diagrams of the manufacturing process of the full-color organic EL display panel.

  The # 7059 glass substrate manufactured by Corning Japan Co., Ltd. is used as a support substrate, and the selective reflection wavelength region can be controlled over the entire visible region by adjusting the spiral pitch of the Ch-LCP according to the temperature. Yes, an ultraviolet curable Ch-LCP that can freeze its liquid crystal state by ultraviolet irradiation was used.

  As shown in FIG. 4 (1), the support substrate (8) is washed and dried, and then printed by a spin coater so that the Ch liquid crystal 2 (22) using Ch-LCP has a thickness of 5 μm after baking. And dried.

Next, as shown in FIG. 4 (2), the support substrate (8) on which the Ch liquid crystal 2 (22) is printed is placed on the hot plate (30), and the temperature 46 becomes a spiral pitch that reflects red. The mixture was heated to 0 ° C. and irradiated with ultraviolet rays ² J / cm ² through a mask (31) designed so that the red reflection was fixed at a desired position.

Subsequently, the hot plate (30) is heated to a temperature of 63 [deg.] C. at which the spiral pitch for reflecting green is heated, and ultraviolet rays 2J are passed through a mask (32) designed so that the green reflection is fixed at a desired position. / Cm ² was irradiated.

Subsequently, the hot plate (30) is heated to 87 ° C. at a spiral pitch that reflects blue, and ultraviolet rays 2J are passed through a mask (33) designed so that the blue reflection is fixed at a desired position. / Cm ² was irradiated.

Next, the hot plate is removed, the support substrate (8) and the formed Ch liquid crystal 2 (22) are cooled to 30 ° C. or lower, and the Ch liquid crystal 2 (22) is irradiated with ultraviolet rays ² J / cm ² to obtain an uncured portion. Was fixed to obtain a Ch liquid crystal color filter 2 (22 ′).

  Next, as shown in FIG. 4 (3), the Ch liquid crystal 1 (21) is printed on the Ch liquid crystal color filter 2 (22 ′) by a spin coater so that the thickness becomes 5 μm after baking. did.

The support substrate (8) on which the Ch liquid crystal 1 (21) is printed is placed on a hot plate (30) and heated to a temperature of 46 ° C. at a spiral pitch that reflects red, and the reflected light is reflected in green. Irradiation with ultraviolet rays of ² J / cm ² was performed through a mask (32) designed to be fixed on a pixel exhibiting the above.

Subsequently, the hot plate (30) is heated to a temperature of 63 ° C. at a spiral pitch for reflecting green, and the green reflection is passed through a mask (33) designed so that the reflected light can be fixed on a pixel exhibiting a blue color. Then, ultraviolet rays of ² J / cm ² were irradiated.

Subsequently, the hot plate (30) is heated to a temperature of a spiral pitch for reflecting blue light at 87 ° C., and a mask (31) designed so that the blue reflection can be fixed onto the pixel whose reflected light is red. Then, ultraviolet rays of ² J / cm ² were irradiated.

Next, the hot plate is removed, and the Ch liquid crystal 1 (21) layered on the support substrate (8) and the Ch liquid crystal color filter 2 (22 ′) is cooled to 30 ° C. or lower to obtain the Ch liquid crystal 1 (21). Is irradiated with ultraviolet rays ² J / cm ² to immobilize the uncured portion, and the Ch liquid crystal color filter 1 (
21 ′) was obtained.

  The surface roughness of the Ch liquid crystal color filter 1 (21 ') was measured. The results are shown in Table 1.

次に、図５（１）〜（２）に示すように、上記Ｃｈ液晶カラーフィルタ１（２１’）上に酸化ケイ素からなるパシベーション膜（５）をＣＶＤにより形成し、更に、上記パシベーション膜（５）上に蒸着器により透明第２電極膜を形成し、エッチングして透明第２電極（４）を形成した。

Next, as shown in FIGS. 5 (1) to (2), a passivation film (5) made of silicon oxide is formed on the Ch liquid crystal color filter 1 (21 ′) by CVD, and the passivation film ( 5) A transparent second electrode film was formed on the top by a vapor deposition device and etched to form a transparent second electrode (4).

  Next, as shown in FIGS. 5 (3) to (5), after washing the above laminate, it is set in a vacuum deposition apparatus, and a hole injection layer / hole transport layer / organic light emitting layer / blocking layer / electron. They were laminated in the order of the transport layer. Furthermore, the first electrode (2) was formed and formed, and a support substrate capable of sealing the organic material layer was laminated to form a full-color organic EL display panel. Although a voltage of 5 V was applied to the full color organic EL display panel, no dark spots were generated. Further, although the voltage of 5 V was continuously applied for 1,000 hours, the generation and growth of dark spots were not observed.

  The # 7059 glass substrate manufactured by Corning Japan Co., Ltd. is used as a support substrate, and the selective reflection wavelength region can be controlled over the entire visible region by adjusting the spiral pitch of the Ch-LCP according to the temperature. Yes, an ultraviolet curable Ch-LCP that can freeze its liquid crystal state by ultraviolet irradiation was used.

  The support substrate (8) was washed and dried, and then printed with a microgravure coater so that the Ch liquid crystal 2 (22) had a thickness of 5 μm after baking, and dried.

The support substrate (8) on which the Ch liquid crystal 2 (22) is printed is placed on a hot plate (30), and heated to a temperature of 46 ° C. at a spiral pitch that reflects red, and the red reflection is at a desired position. Ultraviolet light ² J / cm ² was irradiated through a mask (31) designed to be fixed.

Subsequently, the hot plate (30) is heated to a temperature of 63 [deg.] C. at which the spiral pitch for reflecting green is heated, and ultraviolet rays 2J are passed through a mask (32) designed so that the green reflection is fixed at a desired position. / Cm ² was irradiated.

Subsequently, the hot plate (30) is heated to 87 ° C. at a spiral pitch that reflects blue, and ultraviolet rays 2J are passed through a mask (33) designed so that the blue reflection is fixed at a desired position. / Cm ² was irradiated.

Next, the hot plate is removed, the support substrate (8) and the formed Ch liquid crystal 2 (22) are cooled to 30 ° C. or lower, and the Ch liquid crystal 2 (22) is irradiated with ultraviolet rays ² J / cm ² to obtain an uncured portion. Was fixed to obtain a Ch liquid crystal color filter 2 (22 ′).

  Next, the Ch liquid crystal 1 (21) was printed on the Ch liquid crystal color filter 2 (22 ') by a micro gravure coater so as to have a thickness of 5 μm after baking and dried.

The support substrate (8) on which the Ch liquid crystal 1 (21) is printed is placed on a hot plate (30) and heated to a temperature of 46 ° C. at a spiral pitch that reflects red, and the reflected light is reflected in green. Irradiation with ultraviolet rays of ² J / cm ² was performed through a mask (32) designed to be fixed on a pixel exhibiting the above.

Subsequently, the hot plate (30) is heated to a temperature of 63 ° C. at a spiral pitch for reflecting green, and the green reflection is passed through a mask (33) designed so that the reflected light can be fixed on a pixel exhibiting a blue color. Then, ultraviolet rays of ² J / cm ² were irradiated.

Subsequently, the hot plate (30) is heated to a temperature of a spiral pitch for reflecting blue light at 87 ° C., and a mask (31) designed so that the blue reflection can be fixed onto the pixel whose reflected light is red. Then, ultraviolet rays of ² J / cm ² were irradiated.

Next, the hot plate is removed, and the Ch liquid crystal 1 (21) layered on the support substrate (8) and the Ch liquid crystal color filter 2 (22 ′) is cooled to 30 ° C. or lower, and the Ch liquid crystal 1 (21 ) Was irradiated with ultraviolet rays ² J / cm ² to immobilize the uncured portion, and Ch liquid crystal color filter 1 (21 ′) was obtained.

  The surface roughness of the Ch liquid crystal color filter 1 (21 ') was measured. The results are shown in Table 2.

次に、上記Ｃｈ液晶カラーフィルタ１（２１’）上に酸化ケイ素からなるパシベーション膜（５）をＣＶＤにより形成し、更に、上記パシベーション膜（５）上に蒸着器により透明第２電極膜を形成し、エッチングして透明第２電極（４）を形成した。

Next, a passivation film (5) made of silicon oxide is formed on the Ch liquid crystal color filter 1 (21 ') by CVD, and further a transparent second electrode film is formed on the passivation film (5) by a vapor deposition device. Then, the transparent second electrode (4) was formed by etching.

  Next, after washing the laminated body, it was set in a vacuum vapor deposition apparatus, and laminated in the order of hole injection layer / hole transport layer / organic light emitting layer / blocking layer / electron transport layer. Furthermore, the first electrode (2) was formed and formed, and a support substrate capable of sealing the organic material layer was laminated to form a full-color organic EL display panel.

  Although a voltage of 5 V was applied to the full color organic EL display panel, no dark spots were generated. In addition, although a voltage of 5 V of 1,000 was continuously applied, generation and growth of dark spots were not observed.

  A # 7059 glass substrate manufactured by Corning Japan Co., Ltd. was used as a support substrate, and a pigment-dispersed color filter having a thickness of 1.5 μm was formed on the support substrate. For the purpose of flattening, after drying, the flattened film was printed and dried with a spin coater so that the total film thickness was 3 μm.

  The surface roughness of the flattened film on the pigment-dispersed color filter was measured. The results are shown in Table 3.

次に、上記平坦化膜上に酸化ケイ素からなるパシベーション膜をＣＶＤにより形成し、更に、上記パシベーション膜上に蒸着器により透明第２電極膜を形成し、エッチングして透明第２電極を形成した。

Next, a passivation film made of silicon oxide was formed on the flattening film by CVD, and a transparent second electrode film was formed on the passivation film by a vapor deposition device, and then etched to form a transparent second electrode. .

  Next, after washing the laminated body, it was set in a vacuum vapor deposition apparatus, and laminated in the order of hole injection layer / hole transport layer / organic light emitting layer / blocking layer / electron transport layer. Further, a first electrode was formed and a support substrate capable of sealing the organic material layer was laminated to form a full color organic EL display panel.

  When a voltage of 5 V was passed through the full color organic EL display panel, dark spots were generated. In addition, although a voltage of 5 V was continuously applied for 1,000 hours, dark spots were newly generated with the passage of time, and the growth of existing dark spots was observed.

It is sectional drawing of an example of a color EL display. It is sectional drawing of an example of a color EL display. It is sectional drawing which shows one Example of the full-color organic electroluminescent display panel by this invention. (1)-(4) is explanatory drawing of the manufacturing process of a full-color organic electroluminescent display panel. (1)-(5) is explanatory drawing of the manufacturing process of a full-color organic electroluminescent display panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 8 ... Support substrate 2 ... 1st electrode 3 ... Organic material layer 4 ... Transparent 2nd electrode 5 ... Passivation film 6 ... Flattening layer 7 ... Color filter 9 ... Optical film 21 ... Ch liquid crystal 1
22 ... Ch liquid crystal 2
21 '... Ch liquid crystal color filter 1
22 '... Ch liquid crystal color filter 2
30 ... Hot plates 31, 32, 33 ... Mask

Claims (1)

Color display is performed by a pixel-like white organic EL element composed of a first electrode, an organic material layer made of a polymer light emitting material, and a second electrode, and a pixel-like color filter corresponding to the white organic EL element. A method for manufacturing a full color organic EL display panel, wherein Ch-LCP (cholesteric liquid crystal polymer) is used as a base material of the color filter, and the pixel of the color filter is a spiral pitch adjustment of the Ch-LCP, It is a pixel whose transmitted light color is set by fixing, and is composed of a plurality of pixels set to different transmitted light colors, and silicon oxide or nitridation is provided between the white organic EL element and the color filter. A passivation film made of silicon is provided, and is formed so that the passivation film is in contact with the color filter. The method of manufacturing a full-color organic EL display panel on Shibeshon film wherein is formed so that the white organic EL element is in contact, the production of full-color organic EL display panel, wherein the carrying out step 1) to 7) below in order Method.
1) A step of flatly forming a Ch-LCP layer with a desired film thickness on a support substrate;
2) As transmitted light color of the Ch-LCP layer exhibits a blue color, by adjusting the helical pitch of the Ch-LCP layer by temperature, the by UV or EB exposure through a mask having an opening corresponding to the pixel Curing the Ch-LCP layer to fix the helical pitch and forming a blue pixel of a color filter in which the transmitted light color is set to blue;
3) of the blue pixel is the Ch-LCP layer formed as transmitted light color in the portion other than the blue pixel exhibits a green to adjust the helical pitch of the Ch-LCP layer with temperature, adjacent to the blue pixel by curing the Ch-LCP layers to secure the helical pitch by UV or EB exposure through a mask having an opening corresponding to the pixel to pixel positions, green pixels of the color filters to set the transmitted light color to green Forming step,
4) of the blue pixel and the Ch-LCP layer green pixels are formed, as transmitted light color in the portion other than the blue pixel and green pixel exhibits red, adjusting the helical pitch of the Ch-LCP layer by temperature and, by curing the Ch-LCP layers to secure the helical pitch by UV or EB exposure through a mask having an opening corresponding to the pixel to pixel position adjacent to the green pixel, and sets the transmitted light color to red Forming a red pixel of the color filter;
5) the blue pixel, green pixel, and red pixel are not formed step of fixing the helical pitch of the portion of the Ch-LCP layer,
6) A step of providing a passivation film made of silicon oxide or silicon nitride on the Ch-LCP layer by a sputtering method or a plasma CVD method ,
7) A step of forming a pixel-like white organic EL element made of a polymer light emitting material on the passivation film.

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