CN111192907A - OLED display panel and display device - Google Patents

OLED display panel and display device Download PDF

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Publication number
CN111192907A
CN111192907A CN202010018853.3A CN202010018853A CN111192907A CN 111192907 A CN111192907 A CN 111192907A CN 202010018853 A CN202010018853 A CN 202010018853A CN 111192907 A CN111192907 A CN 111192907A
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CN
China
Prior art keywords
layer
display panel
oled display
alignment
liquid crystal
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Pending
Application number
CN202010018853.3A
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Chinese (zh)
Inventor
李远航
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Original Assignee
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Application filed by Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to CN202010018853.3A priority Critical patent/CN111192907A/en
Publication of CN111192907A publication Critical patent/CN111192907A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • H10K50/842—Containers
    • H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • 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

Abstract

The present disclosure provides an OLED display panel and a display device. The OLED display panel comprises a substrate, a driving circuit layer, a light-emitting function layer and an encapsulation layer which are sequentially arranged. The packaging layer comprises a first inorganic packaging layer, a composite polarizer layer and a second inorganic packaging layer which are stacked. Through setting up compound polarizer layer at the encapsulated layer, realize that the polaroid is integrated in OLED display panel to the thickness of attenuate OLED display panel improves the reliability of buckling simultaneously.

Description

OLED display panel and display device
Technical Field
The disclosure relates to the field of display technologies, and in particular, to an OLED display panel and a display device.
Background
A Polarizer (POL) is an indispensable structure of a Liquid Crystal Display (LCD) and an Organic Light emitting diode Display (OLED). In contrast, two LCD sheets are required, one OLED sheet is required, and a quarter wave plate is additionally arranged to become a circular polarizer so as to reduce the reflection of the metal electrode. For a common OLED polarizer, the thickness of the polarizer is about 240 micrometers, and the structure of the polarizer is, from top to bottom, a protective layer, an anti-reflection layer, a TAC (Triacetate cellulose) layer, a polarizing layer, a TAC layer, an Adhesive (Adhesive) layer, an 1/4 wave plate layer, an Adhesive layer, and a protective layer. The polarizing layer is used for polarizing light, and the main material is polyvinyl alcohol (PVA).
Aiming at the current dynamic bending OLED panel, the requirement on the reliability of the panel bending is high, so that a thinner display module is one of the important directions for realizing the dynamic bending. However, due to the material characteristics of the polarizing layer, the polarizing performance can only be realized by adopting a stretching process, a thinning structure cannot be realized, and the process of externally attaching the polarizer is complex and is not beneficial to bending reliability.
Therefore, the problem of poor performance of the conventional polarizer needs to be solved.
Disclosure of Invention
The disclosure provides an OLED display panel and a display device, which are used for relieving the technical problem of poor performance of the conventional polarizer.
In order to solve the above problems, the technical solution provided by the present disclosure is as follows:
the embodiment of the disclosure provides an OLED display panel, which includes a substrate, a driving circuit layer, a light emitting functional layer, and an encapsulation layer. The driving circuit layer is arranged on the substrate. The light emitting function layer is arranged on the driving circuit layer. The packaging layer is arranged on the luminous functional layer and comprises a first inorganic packaging layer, a composite polarizer layer and a second inorganic packaging layer which are arranged in a stacked mode. The composite polarizer layer comprises a first orientation layer, a quarter-wave plate phase difference layer, a second orientation layer, a polarizing layer and a protective layer which are arranged in a stacked mode.
In the OLED display panel provided by the embodiments of the present disclosure, the thickness of the film layer of the encapsulation layer is less than 20 micrometers.
In the OLED display panel provided in the embodiments of the present disclosure, the material of the first alignment layer and the second alignment layer is at least one alignment polymer selected from the group consisting of polyamide, gelatin, polyimide having an imide bond and a hydrolysate thereof, polyvinyl alcohol, alkyl modified polyvinyl alcohol, and polyacrylamide.
In the OLED display panel provided by the embodiment of the present disclosure, the first alignment layer and the second alignment layer are aligned in a rubbing manner.
In the OLED display panel provided by the embodiment of the present disclosure, the first alignment layer is used to control the alignment of the quarter-wave plate phase difference layer; the second alignment layer is used for controlling the alignment of the polarizing layer.
In the OLED display panel provided in the embodiment of the present disclosure, the material of the quarter-wave plate retardation layer is a polymerizable liquid crystal composition, and the polymerizable liquid crystal composition includes a photopolymerization initiator, a photosensitizing agent, a polymerization inhibitor, a leveling agent, an adhesion improving agent, and a polymerizable liquid crystal compound.
In the OLED display panel provided in the embodiment of the present disclosure, the material of the polarizing layer is a polymerizable liquid crystal composition, and the polymerizable liquid crystal composition includes a composition synthesized from a dichroic pigment, a photopolymerization initiator, a photosensitizing agent, a polymerization inhibitor, a leveling agent, an adhesion improving agent, and a polymerizable liquid crystal compound.
In the OLED display panel provided in the embodiments of the present disclosure, the material of the protection layer is at least one organic substance selected from acrylic resin, epoxy resin, and silicone.
In the OLED display panel provided in the embodiment of the present disclosure, the OLED display panel further includes a retaining wall, where the retaining wall is disposed at the edge of the display area of the driving circuit layer and surrounds the light emitting functional layer and the encapsulation layer.
The embodiment of the present disclosure further provides a display device, which includes the OLED display panel, a back plate, and a cover plate provided in one of the foregoing embodiments of the present disclosure, wherein the OLED display panel is disposed on the back plate, and the cover plate is disposed on the OLED display panel.
The beneficial effects of this revelation do: according to the OLED display panel and the display device, the composite polarizer layer is arranged on the packaging layer to replace an organic packaging layer, and the polarizer is integrated in the OLED display panel, so that the thickness of the OLED display panel is reduced, and the bending reliability is improved.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an OLED display panel according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a driving circuit layer and a light-emitting functional layer film layer according to an embodiment of the disclosure;
fig. 3 is a schematic top view of a retaining wall structure according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a composite polarizer layer structure according to an embodiment of the disclosure;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the disclosure.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the disclosure may be practiced. Directional phrases used in this disclosure, such as [ upper ], [ lower ], [ front ], [ back ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., refer only to the directions of the attached drawings. Accordingly, the directional terms used are used for the purpose of illustration and understanding of the present disclosure, and are not used to limit the present disclosure. In the drawings, elements having similar structures are denoted by the same reference numerals.
In one embodiment, as shown in fig. 1, an OLED display panel 100 is provided, which includes a substrate 10, a driving circuit layer 20, a light emitting function layer 30, and an encapsulation layer 40. The driving circuit layer 20 is disposed on the substrate 10. The light emitting function layer 30 is disposed on the driving circuit layer 20. The encapsulation layer 40 is disposed on the light-emitting functional layer 30, and the encapsulation layer 40 includes a first inorganic encapsulation layer 41, a composite polarizer layer 42, and a second inorganic encapsulation layer 43 that are stacked. The composite polarizer layer 42 includes a first alignment layer 421, a quarter-wave plate retardation layer 422, a second alignment layer 423, a polarizing layer 424, and a protective layer 425 stacked in layers.
Specifically, the thickness of the film layer of the encapsulation layer 40 is less than 20 micrometers.
In this embodiment, the composite polarizer layer 42 is integrated in the package layer 40, so that an OLED display panel structure without an external polarizer is realized, the thickness of the OLED display panel is reduced, and the bending reliability of the OLED display panel is improved.
In one embodiment, as shown in the OLED display panel 100 of fig. 1, the substrate 10 is a flexible substrate, and the material of the substrate may be a flexible polymer such as Polyimide (PI).
Further, the driving circuit layer 20 is disposed on the substrate 10, and the driving circuit layer 20 includes a barrier layer 21, a buffer layer 22, an active layer 23, a first gate insulating layer 24, a first gate layer 25, a second gate insulating layer 26, a second gate layer 27, an interlayer insulating layer 28, a source/drain layer 29, and a planarization layer 38, which are stacked, as shown in fig. 2.
Further, the light emitting function layer 30 is disposed on the driving circuit layer 20, and the light emitting function layer 30 includes a pixel electrode layer 31, a pixel defining layer 32, a light emitting layer 33, and a common electrode layer 34, which are stacked, as shown in fig. 2.
Further, the encapsulation layer 40 is disposed on the light-emitting functional layer 30, and the encapsulation layer 40 includes a first inorganic encapsulation layer 41, a composite polarizer layer 42, and a second inorganic encapsulation layer 43, which are stacked together, as shown in fig. 1.
Specifically, the material of the first inorganic sealing layer 41 and the second inorganic sealing layer 43 is one or a combination of several of inorganic substances such as silicon nitride (SiNx), silicon oxide (SiOx), and silicon oxynitride (SiNO). The first inorganic packaging layer and the second inorganic packaging layer have good water and oxygen blocking effect and can block water and oxygen from invading the light-emitting layer.
Specifically, the first inorganic encapsulation layer 41 and the second inorganic encapsulation layer 43 may be prepared by a Chemical Vapor Deposition (CVD) method, a Physical Vapor Deposition (PVD) method, an Atomic Layer Deposition (ALD) method, or other processes.
Further, the composite type polarizer layer 42 includes a first alignment layer 421, a quarter-wave plate retardation layer 422, a second alignment layer 423, a polarizing layer 424, and a protective layer 425, which are stacked, as shown in fig. 1.
Specifically, the material of the first alignment layer 421 is at least one of an alignment polymer such as polyamide, gelatin, polyimide having an imide bond and a hydrolysate thereof, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, and polyacrylamide.
Specifically, two or more kinds of the alignment polymers are dissolved in a solvent to form a composition, and then the formed composition is prepared on the first inorganic encapsulation layer using an Ink Jet Print (IJP) process. Then the film is solidified into a film by adopting an ultraviolet light solidification mode.
Furthermore, the film layer after ultraviolet curing is rubbed by adopting a rubbing orientation mode to endow orientation control force. A first alignment layer is formed for controlling the alignment of the quarter-wave plate retardation layer 422.
Specifically, the quarter-wave plate retardation layer 422 is made of a polymerizable liquid crystal composition, and the polymerizable liquid crystal composition includes a photopolymerization initiator, a photosensitizing agent, a polymerization inhibitor, a leveling agent, an adhesion improving agent, and a polymerizable liquid crystal compound.
Specifically, the polymerizable liquid crystal composition is prepared on the first alignment layer by an ink jet printing process, so that the polymerizable liquid crystal composition has an alignment state. And then, carrying out ultraviolet curing on the polymerizable liquid crystal composition with the orientation state to form the quarter-wave plate phase difference layer.
Further, the second alignment layer 423 is prepared on the quarter-wave plate retardation layer using the same process and material as the first alignment layer 421. For controlling the orientation of the polarizing layer 424.
Specifically, the material of the polarizing layer 424 is a polymerizable liquid crystal composition, and the polymerizable liquid crystal composition includes a composition synthesized from a dichroic pigment, a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a leveling agent, an adhesion improving agent, and a polymerizable liquid crystal compound.
Specifically, the polymerized liquid crystal composition formed by synthesis is prepared on the second orientation layer by adopting an ink-jet printing process, so that the polymerized liquid crystal composition formed by synthesis has an orientation state. Subsequently, the polymerizable liquid crystal composition having an alignment state is cured by ultraviolet light to form a polarizing layer.
Further, a protective layer 425 is formed on the polarizing layer 424 by an ink-jet printing process. For protecting the polarizing layer from damage when depositing the second inorganic encapsulating layer.
Specifically, the material of the protective layer 425 is at least one organic substance selected from acrylic resin, epoxy resin, and silicone.
Further, the OLED display panel further includes a retaining wall 50, which is disposed at the edge of the display region of the driving circuit layer 20 and surrounds the light emitting function layer and the encapsulation layer, as shown in fig. 3.
Specifically, the composite polarizer layer 42 in the package layer 40 is prepared by an inkjet printing process, and each film material of the composite polarizer layer has fluidity during preparation. The dam 50 may block the ink-jet printed material from overflowing the boundary, as shown in fig. 4.
In one embodiment, a method for manufacturing an OLED display panel is provided, which includes the steps of:
step S1: the manufacturing method of the driving circuit layer comprises the steps of providing a flexible substrate, and sequentially laminating and manufacturing a barrier layer, a buffer layer, an active layer, a first grid insulating layer, a first grid layer, a second grid insulating layer, a second grid layer, an interlayer insulating layer, a source drain layer and a planarization layer on the flexible substrate;
step S2: a step of preparing a luminous function layer, which comprises the step of sequentially laminating and preparing a pixel electrode layer, a pixel definition layer, a luminous layer and a common electrode layer on the drive circuit layer;
step S3: and a packaging layer preparation step, wherein a first inorganic packaging layer, a composite polarizer layer and a second inorganic packaging layer are sequentially laminated on the light-emitting functional layer.
Specifically, in step S2, a dam is prepared at the edge of the display area of the driving circuit. The method is used for blocking the overflow boundary of the ink-jet printing material when the composite polarizer layer is prepared subsequently.
Specifically, in step S3, the preparation of the composite polarizer layer includes the following steps:
step S31: a first alignment layer preparation step of dissolving two or more kinds of alignment polymers selected from polyamide, gelatin, polyimide having an imide bond and a hydrolysate thereof, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, and the like in a solvent to form a composition, preparing the composition into the first inorganic encapsulation layer by an inkjet printing process, and forming a film by ultraviolet curing to form a first alignment layer;
step S32: preparing at least one of a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a leveling agent, an adhesion improver and a polymerizable liquid crystal compound on the first alignment layer by adopting an ink-jet printing process, so that the polymerizable liquid crystal composition has an alignment state, and forming a film by ultraviolet curing to form the quarter-wave plate phase difference layer;
step S33: a second alignment layer preparation step, which comprises preparing the second alignment layer by adopting the preparation process and the material of the first alignment layer;
step S34: a polarizing layer preparation step, which comprises synthesizing a composition formed by dichroic pigment, a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a flatting agent, an adhesion improver and a polymerizable liquid crystal compound, preparing the composition on the second orientation layer by adopting an ink-jet printing process, enabling the synthesized polymerizable liquid crystal composition to have an orientation state, and forming a film by ultraviolet light curing to form a polarizing layer;
step S35: and a protective layer preparation step, which comprises preparing at least one organic substance of acrylic resin, epoxy resin, silicone and the like on the polarizing layer by adopting an ink-jet printing process, and curing by using ultraviolet light to form a film.
Specifically, in step S31, the first alignment layer after uv curing and film formation is rubbed by rubbing alignment to apply an alignment control force. For controlling the orientation of the quarter-wave plate phase difference layer.
Specifically, in step S33, after the second alignment layer is prepared by using the preparation process and material of the first alignment layer, the film is formed by uv curing. Rubbing the second alignment layer after ultraviolet curing film formation in a rubbing alignment manner to give an alignment control force. For controlling the orientation of the polarizing layer.
In an embodiment, an apparatus 1000 is further provided, as shown in fig. 5, including the OLED display panel 100, the back plate 200 and the cover plate 300 of the above embodiments, wherein the OLED display panel 100 is disposed on the back plate 200, and the cover plate 300 is disposed on the OLED display panel 100.
According to the above embodiments:
in the OLED display panel, the preparation method thereof and the display device provided by the disclosure, the encapsulation layer includes a first inorganic layer, a composite polarizer layer and a second inorganic layer which are stacked. The composite polarizer layer comprises a first orientation layer, a quarter-wave plate phase difference layer, a second orientation layer, a polarizing layer and a protective layer which are arranged in a stacked mode. Through setting up compound polarisation lamella at the encapsulated layer, replace organic encapsulated layer, realize that the polaroid is integrated in OLED display panel to the thickness of attenuate OLED display panel improves the reliability of buckling simultaneously.
In summary, although the present disclosure has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present disclosure, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, so that the scope of the present disclosure is defined by the appended claims.

Claims (10)

1. An OLED display panel, comprising:
a substrate;
a driving circuit layer disposed on the substrate;
a light emitting functional layer disposed on the driving circuit layer; and
the packaging layer is arranged on the luminous functional layer and comprises a first inorganic packaging layer, a composite polarizer layer and a second inorganic packaging layer which are arranged in a stacked mode;
the composite polarizer layer comprises a first orientation layer, a quarter-wave plate phase difference layer, a second orientation layer, a polarizing layer and a protective layer which are arranged in a stacked mode.
2. The OLED display panel of claim 1, wherein the encapsulation layer has a film thickness of less than 20 microns.
3. The OLED display panel according to claim 2, wherein the material of the first alignment layer and the second alignment layer is at least one alignment polymer selected from the group consisting of polyamide, gelatin, polyimide having an imide bond and a hydrolysate thereof, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, and polyacrylamide.
4. The OLED display panel of claim 3, wherein the first alignment layer and the second alignment layer are oriented by rubbing.
5. The OLED display panel of claim 4, wherein the first alignment layer is configured to control the alignment of the quarter-wave plate phase difference layer; the second alignment layer is used for controlling the alignment of the polarizing layer.
6. The OLED display panel of claim 2, wherein the material of the quarter-wave plate retardation layer is a polymerizable liquid crystal composition, and the polymerizable liquid crystal composition comprises a photopolymerization initiator, a photosensitizing agent, a polymerization inhibitor, a leveling agent, an adhesion improver, and a polymerizable liquid crystal compound.
7. The OLED display panel of claim 2, wherein the material of the polarizing layer is a polymerizable liquid crystal composition, and the polymerizable liquid crystal composition comprises a composition synthesized from a dichroic pigment, a photopolymerization initiator, a photosensitizing agent, a polymerization inhibitor, a leveling agent, an adhesion improver, and a polymerizable liquid crystal compound.
8. The OLED display panel of claim 2, wherein the material of the protection layer is at least one organic substance selected from the group consisting of acrylic resin, epoxy resin and silicone.
9. The OLED display panel of claim 1, further comprising a retaining wall disposed at an edge of the display region of the driving circuit layer and surrounding the light emitting function layer and the encapsulation layer.
10. A display device comprising the OLED display panel of any one of claims 1-9, a backplane, and a cover sheet, wherein the OLED display panel is disposed on the backplane and the cover sheet is disposed on the OLED display panel.
CN202010018853.3A 2020-01-08 2020-01-08 OLED display panel and display device Pending CN111192907A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113066393A (en) * 2021-03-03 2021-07-02 武汉华星光电半导体显示技术有限公司 Display device
CN113488603A (en) * 2021-07-07 2021-10-08 业成科技（成都）有限公司 Method for manufacturing optical display device
CN114335263A (en) * 2021-12-30 2022-04-12 深圳市思坦科技有限公司 LED device, manufacturing method thereof and display device

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CN108334241A (en) * 2018-03-21 2018-07-27 武汉华星光电半导体显示技术有限公司 Touch-control structure of polarized light and flexible display apparatus
CN109065579A (en) * 2018-07-27 2018-12-21 昆山国显光电有限公司 Display panel and preparation method thereof, electronic equipment
CN109659340A (en) * 2018-12-12 2019-04-19 武汉华星光电半导体显示技术有限公司 The preparation method of display panel and display panel
CN109802046A (en) * 2017-11-16 2019-05-24 上海和辉光电有限公司 A kind of OLED display

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN109802046A (en) * 2017-11-16 2019-05-24 上海和辉光电有限公司 A kind of OLED display
CN108334241A (en) * 2018-03-21 2018-07-27 武汉华星光电半导体显示技术有限公司 Touch-control structure of polarized light and flexible display apparatus
CN109065579A (en) * 2018-07-27 2018-12-21 昆山国显光电有限公司 Display panel and preparation method thereof, electronic equipment
CN109659340A (en) * 2018-12-12 2019-04-19 武汉华星光电半导体显示技术有限公司 The preparation method of display panel and display panel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113066393A (en) * 2021-03-03 2021-07-02 武汉华星光电半导体显示技术有限公司 Display device
CN113488603A (en) * 2021-07-07 2021-10-08 业成科技（成都）有限公司 Method for manufacturing optical display device
CN113488603B (en) * 2021-07-07 2023-08-25 业成科技（成都）有限公司 Method for manufacturing optical display device
CN114335263A (en) * 2021-12-30 2022-04-12 深圳市思坦科技有限公司 LED device, manufacturing method thereof and display device

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Application publication date: 20200522