CN109671866B - Retaining wall structure of display module - Google Patents

Retaining wall structure of display module Download PDF

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Publication number
CN109671866B
CN109671866B CN201811574624.9A CN201811574624A CN109671866B CN 109671866 B CN109671866 B CN 109671866B CN 201811574624 A CN201811574624 A CN 201811574624A CN 109671866 B CN109671866 B CN 109671866B
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retaining wall
layer
barricade
wall structure
organic
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CN109671866A (en
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王俊媛
曹君
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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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
    • H10K50/844—Encapsulations
    • 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
    • H10K59/122—Pixel-defining structures or layers, e.g. banks

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The utility model provides a display module assembly retaining wall structure, including organic light emitting display base plate, pixel definition layer, packaging layer to and barricade, the barricade surrounds organic light emitting display base plate's display area, pixel definition layer and packaging layer at least, the barricade is injectd the boundary of packaging layer, the barricade still includes the recess, be provided with at least one recess on the medial surface of barricade, the height of recess is not more than the height of barricade. The recess on the barricade forms capillary channel, and under capillary action's suction, in the intraformational printing ink of organic is adsorbed the recess, and then increase and the contact of barricade bottom, prevent overflowing of organic liquid, improve the encapsulation effect.

Description

Retaining wall structure of display module
Technical Field
The disclosure relates to the technical field of display, in particular to a retaining wall structure of a display module.
Background
Organic Light Emitting Diodes (OLEDs) are increasingly used in various display fields due to their characteristics of self-luminescence, wide viewing angle, fast response, and being fabricated on flexible substrates.
An Active Matrix Driving organic light emitting diode (AMOLED), an organic layer, and other devices in the OLED display device are easily corroded by oxygen and water to reduce the service life, and therefore, the AMOLED display panel needs to be packaged. Among them, for flexible displays, Thin Film Encapsulation (TFE) is one of the most commonly used Encapsulation methods. In the conventional TFE encapsulation technology, in order to avoid the phenomenon that the boundary of a thin film formed after the Ink (Ink) is leveled on the substrate is uneven or exceeds the range of the base, a retaining wall (Dam) is usually disposed on the substrate at a position corresponding to the Ink printing boundary, however, in the prior art, the retaining wall and a Pixel Definition Layer (PDL) are usually formed by a mask and exposure process. In actual production, the thickness of the edge of the organic film layer is far less than the thickness of the middle of the organic film layer, so that ink cannot effectively coat the device, and the ink often overflows from the retaining wall, so that water vapor enters and the service life of the OLED is shortened.
In summary, in the conventional display module thin film package, the height difference between the position of the ink printing boundary and the retaining wall is too large to effectively cover the internal device, and the ink is easy to overflow, so that further improvement and improvement schemes are required.
Disclosure of Invention
The disclosure provides a retaining wall structure of a display module, which is used for solving the problems that in the prior art, when a thin film is packaged, the thin film can not effectively package a device, ink easily overflows from the retaining wall, the packaging effect is not ideal, and the like.
To solve the above technical problem, the technical solution provided by the embodiment of the present disclosure is as follows:
according to a first aspect of the embodiments of the present disclosure, a retaining wall structure of a display module is provided, including:
an organic light-emitting display substrate having a plurality of organic light-emitting diodes,
a pixel defining layer disposed on the organic light emitting display substrate,
an encapsulation layer disposed on the pixel definition layer,
the retaining wall at least surrounds the display area of the organic light-emitting display substrate, the pixel defining layer and the packaging layer, so that the retaining wall defines the boundary of the packaging layer;
the retaining wall further comprises at least one groove, the groove is located on the inner side face of the retaining wall and is provided with at least one groove, and the height of the groove is not greater than that of the retaining wall.
According to the retaining wall structure of the display module, the cross section of the groove is rectangular, trapezoidal, triangular or arc-shaped.
According to the retaining wall structure of the display module, the equal spacing distance between every two adjacent grooves is the same, and the grooves are arranged along the bottom of the retaining wall and extend to the top of the retaining wall.
According to the retaining wall structure of the display module in the embodiment of the disclosure, the distance range between two adjacent grooves is between 4um and 10um, and the width range of the grooves is between 4um and 10 um.
According to the retaining wall structure of the display module in the embodiment of the disclosure, the encapsulation layer further includes at least one organic layer and at least one inorganic layer, and the organic layer and the inorganic layer are alternately arranged.
According to the retaining wall structure of the display module in the embodiment of the disclosure, the inorganic layer is made of SiNx、SiOx、AlOx、TiOxOr SiOxNy。
According to the retaining wall structure of the display module in the embodiment of the disclosure, the material of the organic layer is acrylate, epoxy resin, hexamethyldisiloxane or polystyrene.
According to the retaining wall structure of the display module, the top layer of the packaging layer is the inorganic layer, and the retaining wall and the inorganic layer are coated by the inorganic layer.
According to the retaining wall structure of the display module, the organic light-emitting display substrate is a glass substrate or a flexible substrate.
According to the retaining wall structure of the display module, the thickness of the retaining wall is larger than the total thickness of the packaging layer and the pixel definition layer.
In summary, the beneficial effects of the embodiment of the present disclosure are:
through improving the barricade structure among the current thin film packaging technology, set up a plurality of recesses on a side of barricade, the recess has formed several capillary channel, and when organic liquid flowed to here, because capillary action, the ink can flow to the barricade top along the recess for the ink increases at the thickness of barricade bottom, thereby has prevented the condition that the ink spilled over, and has increaseed the encapsulation effect, promoted the encapsulation ability.
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 of the disclosed embodiments, and that other drawings can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic plan view of a display panel according to an embodiment of the disclosure;
FIG. 2 is a schematic structural diagram of a display module according to an embodiment of the disclosure;
FIG. 3 is a schematic view of a retaining wall structure according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of an overlapped structure of an organic layer and an inorganic layer according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. It is to be understood that the described embodiments are merely illustrative of some, but not all embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any inventive step, are intended to be within the scope of the present disclosure.
In the description of the present disclosure, it is to be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The embodiment of the disclosure provides a retaining wall structure of a display module. As shown in fig. 1, fig. 1 is a schematic plan view of a display panel according to an embodiment of the disclosure. An organic light emitting display substrate 100, a retaining wall 101 and a display region 102. The retaining wall 101 structure completely encloses the display area 102 of the organic light emitting display substrate 100, the retaining wall 101 may be single or multiple, and an encapsulation layer is further disposed in the area enclosed by the retaining wall 101, so as to encapsulate the display device through the encapsulation layer, thereby preventing impurities such as moisture from entering the display module.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a display module according to an embodiment of the disclosure. The display module includes a substrate 200, a pixel defining layer 201, an OLED 202, a first inorganic layer 203, a second inorganic layer 204, a dam 205, and an organic layer 206. Pixel determinationThe dummy layer 201 is disposed on the organic light emitting display substrate 200, the organic layer 206 and the inorganic layer are disposed on the organic light emitting display substrate 200, the OLED 202 is disposed on the organic light emitting display substrate 200, and the dam 205 is disposed on the organic light emitting display substrate 200 and encloses the display region of the organic light emitting display substrate 200 and also encloses the pixel defining layer 201. The organic layer and the inorganic layer form an encapsulation layer of the display module, the top layer (i.e. the outermost layer) of the encapsulation layer is the first inorganic layer 203, the first inorganic layer 203 covers the retaining wall 205 and the organic layer 206 inside the encapsulation layer, and the thickness of the retaining wall 205 is greater than the total thickness of the encapsulation layer and the pixel definition layer 201. The first inorganic layer 203 can prevent external moisture from entering the display module, and the inorganic layer can be made of SiNx、SiOx、AlOx、TiOxOr SiOxNyOr other water-resistant inorganic material. The material of the organic layer 206 may be acrylate, epoxy, hexamethyldisiloxane or polystyrene or other organic materials, and the substrate 200 may be a glass substrate or a flexible substrate.
As shown in fig. 3. Fig. 3 is a schematic view of a retaining wall structure according to an embodiment of the disclosure. The retaining wall structure comprises a retaining wall 300, an inner side surface 301 and a groove 302. The grooves 302 are provided on the inner side surfaces 301 of the retaining wall 300. Simultaneously, set up a plurality of such recesses 302 on medial surface 301, the interval between two adjacent recesses 302 is between 4 ~ 10um, and the interval between two adjacent recesses 302 can be the same, and the bottom width of every recess 302 is between 4 ~ 10 um. The height of the groove 302 is not greater than the height of the retaining wall 300, so as to prevent the organic liquid in the organic layer from overflowing along the groove 302. When the groove 302 is formed along the bottom of the wall 300 toward the top of the wall 300, the wall 300 may have a rectangular, trapezoidal, triangular or arc cross-sectional shape.
The overall structure of the display module shown in fig. 2 is schematically illustrated. After the display module is packaged, the first inorganic layer packages the internal organic layer and the retaining wall therein, the material of the organic layer is usually printing ink, because the conventional retaining wall 300 does not have the groove 302 of the embodiment of the present disclosure, the ink easily overflows along the inner side surface 301 of the retaining wall 300, and when the groove 302 is designed in the embodiment of the present disclosure, because the width of the groove 302 is smaller, a plurality of capillary channels are formed by the plurality of small grooves 302, when the width of the bottom of the groove 302 is narrower, the formed capillary phenomenon becomes more obvious, under the action of capillary attraction, the ink of the organic layer will be filled in the groove 302 from the bottom of the groove 302 to the top of the groove 302, so that the thickness of the printing ink of the organic layer and the bottom of the retaining wall 300 is increased, thereby effectively coating the internal device, because part of the printing ink is absorbed into the groove 302, the thickness of the edge region of the organic film layer is increased, the packaging effect is improved.
Referring to FIG. 4, FIG. 4 is a schematic diagram illustrating an overlapping structure of an organic layer and an inorganic layer according to an embodiment of the present disclosure. The display module includes an organic light emitting display substrate 400, a pixel defining layer 401, a third inorganic layer 406, a second organic layer 402, a second inorganic layer 403, a first organic layer 404, a first inorganic layer 405, a retaining wall 407, and an OLED 408. A plurality of pixel defining layers 401 are disposed on the organic light emitting display substrate 400, a third inorganic layer 406 is disposed on the organic light emitting display substrate 400, a second organic layer 402 is disposed on the third inorganic layer 406, a second inorganic layer 403 is disposed on the second organic layer 402, and a first inorganic layer 405 is disposed on the second organic layer 402. The retaining walls 407 enclose the devices in the display area of the substrate 400. The printing ink in the organic layer near the inner side of the dam 407 is absorbed by the groove on the dam 407, thereby preventing the organic liquid from overflowing. In the embodiment of the present disclosure, the encapsulation layer is composed of a plurality of organic layers and inorganic layers, and during encapsulation, the inorganic layers and the organic layers are alternately disposed, the outermost layer of the encapsulation layer is the first inorganic layer 405, and the first inorganic layer 405 encapsulates the device in the encapsulation region, thereby preventing the device from contacting the outside.
The retaining wall structure of the display module provided by the embodiment of the disclosure is described in detail above, and the description of the embodiment is only used to help understanding the technical solution and the core idea of the disclosure; those of ordinary skill in the art will understand that: it is to be understood that modifications may be made to the arrangements described in the embodiments above, and such modifications or alterations may be made without departing from the spirit of the respective arrangements of the embodiments of the present disclosure.

Claims (10)

1. A retaining wall structure of display module is characterized in that it comprises,
an organic light-emitting display substrate having a plurality of organic light-emitting diodes,
a pixel defining layer disposed on the organic light emitting display substrate,
an encapsulation layer disposed on the pixel definition layer,
the retaining wall at least surrounds the display area of the organic light-emitting display substrate, the pixel defining layer and the packaging layer, so that the retaining wall defines the boundary of the packaging layer;
wherein, the barricade still includes an medial surface and an at least recess, the recess is located on the medial surface of barricade to spaced setting is in on the medial surface, the recess along the bottom of barricade to the top of barricade sets up, just the height of recess is not more than the height of barricade.
2. The retaining wall structure of claim 1, wherein the cross-sectional shape of the groove is rectangular, trapezoidal, triangular or arc-shaped.
3. The retaining wall structure of claim 1, wherein the grooves are disposed at equal intervals, and extend from the bottom of the retaining wall to the top of the retaining wall.
4. The retaining wall structure of claim 3, wherein the distance between two adjacent grooves is between 4um and 10um, and the width of the groove is between 4um and 10 um.
5. The retaining wall structure according to claim 1, wherein the encapsulation layer further comprises at least one organic layer and at least one inorganic layer, wherein the organic layer and the inorganic layer are alternately disposed.
6. The retaining wall structure of claim 5, wherein the inorganic layer is made of SiNx、SiOx、AlOx、TiOxOr SiOxNy。
7. The retaining wall structure of claim 5, wherein the organic layer is made of acrylate, epoxy resin, hexamethyldisiloxane or polystyrene.
8. The retaining wall structure of claim 5, wherein the top layer of the encapsulation layer is the inorganic layer, and the inorganic layer covers the retaining wall and the organic layer.
9. The retaining wall structure of claim 1, wherein the organic light emitting display substrate is a glass substrate or a flexible substrate.
10. The retaining wall structure of claim 1, wherein the thickness of the retaining wall is greater than the total thickness of the encapsulation layer and the pixel definition layer.
CN201811574624.9A 2018-12-21 2018-12-21 Retaining wall structure of display module Active CN109671866B (en)

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CN110379933B (en) * 2019-05-30 2021-12-10 京东方科技集团股份有限公司 Display substrate and preparation process thereof
CN110993817B (en) 2019-11-26 2020-12-25 武汉华星光电半导体显示技术有限公司 OLED display panel
CN111754870B (en) * 2020-06-22 2022-05-27 武汉华星光电半导体显示技术有限公司 Flexible display panel and display device
CN112497930B (en) * 2020-11-25 2022-01-25 合肥维信诺科技有限公司 Ink jet printing apparatus and method of operating the same
CN114613922B (en) * 2022-03-11 2023-07-25 武汉华星光电半导体显示技术有限公司 Display panel and display device

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