CN110767671A

CN110767671A - OLED screen, manufacturing method thereof and electronic device

Info

Publication number: CN110767671A
Application number: CN201810836571.7A
Authority: CN
Inventors: 陈佳; 王培章
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-07-26
Filing date: 2018-07-26
Publication date: 2020-02-07

Abstract

The application relates to an OLED screen and a manufacturing method and an electronic device thereof, the OLED screen comprises a cover plate, a base plate and an organic light emitting diode, wherein the cover plate and the base plate are arranged relatively, the organic light emitting diode is positioned between the cover plate and the base plate, the edge of the cover plate and the edge of the base plate are bonded in a sealing mode through a sealing glue and a waterproof sealing frame, the waterproof sealing frame is positioned in the outer side of the sealing glue, a liquid reinforcing layer is filled in a sealed cavity defined by the cover plate, the base plate and the sealing glue, and the reinforcing layer adsorbs the cover plate and the. Set up liquid enhancement layer in the above-mentioned OLED screen, adsorb apron and base plate and become a whole, and when the OLED screen received the impact, apron, base plate and enhancement layer were as a whole, and shock resistance is strong, and the enhancement layer is liquid, has the ability that the buffering was strikeed to guarantee that the OLED screen does not receive the damage.

Description

OLED screen, manufacturing method thereof and electronic device

Technical Field

The application relates to the technical field of display screens, in particular to an OLED screen, a manufacturing method thereof and an electronic device.

Background

Most of the substrate glass and the cover plate glass of the conventional OLED screen are packaged and connected together in a peripheral sealing manner, and when external impact is applied, the substrate glass and the cover plate glass of the whole OLED screen are easily separated or broken to lose efficacy.

Disclosure of Invention

The embodiment of the application provides an OLED screen, an electronic device and a manufacturing method of the OLED screen, and aims to solve the technical problem that when the OLED screen is impacted externally, substrate glass and cover plate glass of the whole OLED screen are easy to separate or break to lose efficacy.

The utility model provides a OLED screen, includes relative apron, the base plate that sets up and is located the organic light emitting diode between apron and the base plate, through the sealed bonding of sealant and waterproof sealing frame between the edge of apron and the edge of base plate, waterproof sealing frame is located sealed outside of gluing, be full of liquid enhancement layer in the sealed cavity that apron, base plate and sealed glue enclose to establish, the enhancement layer adsorbs apron and base plate respectively.

Set up liquid enhancement layer in the above-mentioned OLED screen, adsorb apron and base plate and become a whole, and when the OLED screen received the impact, apron, base plate and enhancement layer were as a whole, and shock resistance is strong, and the enhancement layer is liquid, has the ability that the buffering was strikeed to guarantee that the OLED screen does not receive the damage.

In one embodiment, the waterproof sealing frame is made of low-melting-point glass powder.

In one embodiment, the reinforcing layer is a transparent hydrophobic or hydrophilic liquid which does not react with the cover plate, the substrate, the sealant and the organic light emitting diode, and the reinforcing layer is immersed in the organic light emitting diode.

In one embodiment, the reinforcement layer comprises one or more of a ketone based liquid.

In one embodiment, the reinforcing layer comprises one or more of a pyridine based liquid.

In one embodiment, the reinforcing layer comprises one or more of ether based liquids.

In one embodiment, the reinforcing layer comprises one or more of an aldehyde liquid.

In one embodiment, the side wall of the cover plate and the side wall of the substrate are flush with the edge of the waterproof sealing frame to form the side surface of the OLED screen, and a silicon carbide layer is arranged on the side surface of the OLED screen.

In one embodiment, the cover plate and the substrate are made of glass.

An electronic device includes an OLED screen.

The electronic device comprises the OLED screen, and the screen is strong in impact resistance and not easy to break.

A method of manufacturing an OLED screen, comprising:

providing a cover plate and a substrate;

disposing an organic light emitting diode on a substrate;

coating low-melting-point glass powder on the periphery of one surface of the substrate, which is provided with the organic light-emitting diode;

arranging sealant on the inner side of the low-melting-point glass powder;

a liquid reinforcing layer is filled in the area surrounded by the sealant; and the number of the first and second groups,

and pressing the cover plate and the substrate relatively, respectively melting the low-melting-point glass powder and the sealant, and then solidifying to bond the cover plate and the substrate together.

According to the manufacturing method of the OLED screen, the liquid reinforcing layer is arranged in the area surrounded by the sealant, the cover plate and the substrate, and the cover plate and the substrate are adsorbed into a whole, so that the OLED screen is high in impact resistance, and the reinforcing layer is liquid and has impact buffering capacity, and the OLED screen is not damaged.

In one embodiment, the reinforcing layer is a transparent hydrophobic or hydrophilic liquid, and does not react with the cover plate, the substrate, the sealant and the organic light emitting diode, and the reinforcing layer is immersed in the organic light emitting diode.

In one embodiment, the side wall of the cover plate and the side wall of the substrate are flush with the edge of the waterproof sealing frame to form the side face of the OLED screen, and the method further comprises the step of arranging a silicon carbide layer on the side face of the OLED screen.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a front view of an electronic device according to an embodiment, wherein a screen of the electronic device is an OLED screen;

FIG. 2 is a schematic three-dimensional exploded view of the OLED screen of the electronic device shown in FIG. 1;

FIG. 3 is an enlarged view of the part A shown in FIG. 2;

fig. 4 is a schematic cross-sectional profile view of the OLED screen of the electronic device shown in fig. 1.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As used herein, "terminal device" refers to a device capable of receiving and/or transmitting communication signals including, but not limited to, devices connected via any one or more of the following connections:

(1) via wireline connections, such as via Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connections;

(2) via a Wireless interface means such as a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter.

A terminal device arranged to communicate over a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

(1) satellite or cellular telephones;

(2) personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities;

(3) radiotelephones, pagers, internet/intranet access, Web browsers, notebooks, calendars, Personal Digital Assistants (PDAs) equipped with Global Positioning System (GPS) receivers;

(4) conventional laptop and/or palmtop receivers;

(5) conventional laptop and/or palmtop radiotelephone transceivers, and the like.

Referring to fig. 1 and 2, in an embodiment, the electronic device 10 is a mobile phone, and the display screen of the electronic device 10 is an OLED screen 100.

As shown in fig. 2 and 3, in one embodiment, the OLED screen 100 includes a cover plate 110, a substrate 120, an organic light emitting diode 130, and a reinforcing layer 140. The cover plate 110 and the substrate 120 are arranged oppositely and made of glass, and the cover plate 110 and the substrate 120 are sealed and bonded together through a sealant 150 and a waterproof sealing frame 180. The sealant 150 is adhered to edges of the oppositely disposed surfaces of the cover plate 110 and the substrate 120, and the sealant 150 has a certain height, so that a space exists between the cover plate 110 and the substrate 120. The sealant 150, the cover plate 110 and the substrate 120 together enclose a sealed cavity 160, so as to prevent substances unfavorable for the organic light emitting diode 130 in the external environment from entering the cavity 160. The waterproof sealing frame 180 is located outside the sealant 150, connected between the cover plate 110 and the substrate 120, and has a waterproof function, so as to prevent water vapor or air from entering the cavity 160 through the sealant 150 and damaging the organic light emitting diode 130.

In one embodiment, as shown in fig. 2 and 3, the organic light emitting diode 130 is disposed in the cavity 160. The organic light emitting diode 130 is fixed on the substrate 120. The substrate 120 is provided with a plurality of organic light emitting diodes 130, and the organic light emitting diode 130 in fig. 2 is an enlarged schematic view of only one of the organic light emitting diodes. The OLED screen is powered on and the organic light emitting diode 130 emits light, so that the OLED screen becomes bright.

As shown in fig. 2 to 4, in one embodiment, a reinforcing layer 140 is disposed between the cover plate 110 and the substrate 120. The reinforcing layer 140 is a transparent liquid and fills the sealed cavity 160 defined by the cover plate 110, the substrate 120 and the sealant 150. The reinforcing layer 140 comprises a first liquid level 141 and a second liquid level 142 arranged opposite to each other, and a side 143 connecting the first liquid level 141 and the second liquid level 142. The first liquid level 141 and the cover plate 110 are free of air, vacuum adsorption is achieved, and the adsorption force is strong, so that the cover plate 110 and the reinforcing layer 140 are not easy to separate; no air exists between the second liquid surface 142 and the substrate 120, vacuum adsorption is achieved, and the adsorption force is strong, so that the substrate 120 and the reinforcing layer 140 are not easy to separate; the side 143 is attached to the sealant 150. It will be appreciated that the liquid reinforcement layer 140 fills the cavity 160 and tightly adheres the cover plate 110 and the base plate 120 together, thereby integrating the cover plate 110 and the base plate 120. The condition that when the space between the cover plate 110 and the substrate 120 is hollow, the OLED screen is separated or broken by external impact, so that the whole OLED screen fails is avoided. The reinforcing layer 140 is arranged in the OLED screen, when the OLED screen is impacted, the cover plate 110, the substrate 120 and the reinforcing layer 140 are integrated, the impact resistance is strong, and the reinforcing layer 140 is liquid and has the impact buffering capacity, so that the OLED screen is not damaged.

As shown in fig. 2 to 4, in one embodiment, the liquid-state strengthening layer 140 does not react with all substances on the cover plate 110 and the substrate 120, including physical reaction and chemical reaction, and does not affect the organic light emitting diode 130. The liquid strengthening layer 140 is colorless and transparent, and does not affect the brightness of the organic light emitting diode 130. The reinforcement layer 140 immerses the organic light emitting diodes 130 to achieve sealing of the organic light emitting diodes 130. The reinforcing layer 140 is filled with the cavity 160, so that external moisture, oxygen, heat and the like are prevented from invading into the OLED screen and contacting with the organic light emitting diode 130 to damage the OLED screen, the service life of the OLED screen is ensured, and the repair rate of products can be greatly reduced. The freezing point of the liquid reinforcing layer 140 is below-30 ℃ and the boiling point exceeds 100 ℃, so that the substances can not be subjected to freezing or boiling reaction under the normal use state of the OLED screen, and the display effect of the OLED screen is not influenced.

In one embodiment, the reinforcing layer 140 is a transparent hydrophilic liquid, which may be pure or a mixture. The reinforcing layer 140 includes one or more of ketone based liquids such as acetone. The ketones are a class of organic compounds of the general formula RC (═ O) R ', where R and R' may be the same or different atoms or functional groups. Ketones are structurally characterized by having one carbonyl group (C ═ O) attached to two carbon atoms. The simplest ketone is acetone. Ketones are the only organic species in which the carbonyl carbon is directly attached to two carbon atoms. In aldehydes, carboxylic acids, esters, acid halides and amides, which are also carbonyl compounds, one side of the carbonyl carbon atom is attached to a hydrogen, hydroxyl (oxygen), oxygen, halogen and nitrogen atom, respectively, and is different from a ketone. Ketones are hydrophilic and can be miscible with water molecules in any proportion. When water molecules exist in the cavity 160, the water molecules are firstly dissolved in the ketone liquid, so as to prevent the organic light emitting diode 130 from being damaged. Therefore, the reinforcing layer 140 has good hydrophilicity, and after the reinforcing layer is filled in the cavity 160, the water vapor in the air is firstly dissolved in the ketone liquid, so that the organic light emitting diode 130 is not influenced by the water vapor and the oxygen. The material does not react with all the materials on the cover plate 110 and the substrate 120, and the material is transparent and does not affect the brightness of the organic light emitting diode 130.

In one embodiment, the reinforcing layer 140 is a transparent hydrophilic liquid, which may be pure or a mixture. The reinforcing layer 140 includes a pyridine liquid such as anhydrous pyridine. Pyridine is an organic compound and is a six-membered heterocyclic compound containing one nitrogen heteroatom. Can be regarded as a compound with one (CH) in benzene molecules substituted by N, and is also called as nitrobenzene, colorless or yellowish liquid and has malodor. Pyridine and its homologues are present in bone tar, coal gas, shale oil, petroleum. Pyridine is industrially useful as a denaturant, a dye assistant, and a raw material for synthesizing a series of products including medicines, disinfectants, dyes, etc. The pyridine molecule is miscible with water in any proportion, and the reason for the high water solubility of pyridine is that, in addition to the greater polarity of the molecule, the unshared pair of electrons on the nitrogen atom of pyridine can form a hydrogen bond with water. The hydrocarbon group in the pyridine structure provides it with a comparable affinity for organic molecules, so that polar or non-polar organic compounds can be dissolved. Pyridine and water form an azeotropic mixture, and the boiling point of the azeotropic mixture is 92-93 ℃. In the presence of water molecules in the cavity 160, the water molecules are first dissolved in the pyridine liquid, thereby preventing water vapor and oxygen from contacting the organic light emitting diode 130 and damaging the organic light emitting diode.

In one embodiment, the reinforcing layer 140 is a transparent water-repellent liquid, which may be pure or a mixture. The reinforcing layer 140 includes one or more ethers such as propyl ether. Compounds containing a-C-O-C-group in the molecule are referred to as ethers. The ether compounds all contain ether bonds. Ethers are formed by linking two alkyl or aryl groups to one oxygen atom, and have the general formula: R-O-R. It can also be considered as a compound in which the hydrogen on the hydroxyl group of an alcohol or phenol is replaced by a hydrocarbon group. The most typical compound in the group of ethers is diethyl ether, which is commonly used in organic solvents and medical anesthetics. The application of ether compounds is common in organic chemistry and biochemistry, and they can also be used as connecting segments of carbohydrates and lignin. The oxygen atoms in the propyl ether are "enclosed" in the molecule and are difficult to form hydrogen bonds with water, so that the propyl ether is only slightly soluble in water and can prevent water vapor and oxygen in the air from entering the cavity 160 to damage the organic light emitting diode 130. And the substances are colorless transparent liquid, which does not affect the brightness of the organic light emitting diode 130.

In one embodiment, the reinforcement layer 140 includes aldehydes such as propionaldehyde. The solubility of organic substances is related to groups in the molecule, and generally has a hydrophilic group and a hydrophobic group. The hydrophilic group is: -OH, -CHO, -COOH, -NH 2. The hydrocarbon group is a hydrophobic group. When a hydrophilic group and a hydrophobic group are present in a molecule, it is considered which group is dominant. Generally, hydrocarbon groups are enlarged, and the hydrophobicity is dominant, and the small-size hydrophilicity of the hydrocarbon groups is dominant. The lower aldehyde is easily soluble in water such as formaldehyde, acetaldehyde and the like, but the hydrocarbon group in the higher aldehyde is enlarged so that the higher aldehyde is insoluble in water.

In one embodiment, the waterproof sealing frame 180 is made of low melting point glass frit. The low-melting-point glass powder is low-temperature melting glass powder which is produced by mixing relatively environment-friendly materials, melting, copolymerizing and crystallizing the materials in a high-temperature environment to produce silicon oxide boron metal salt and has the remarkable characteristic of ultralow-temperature melting (generally 390 plus 780 ℃). The low-temperature molten glass powder is an advanced sealing material, has low melting temperature and sealing temperature, good heat resistance and chemical stability and high mechanical strength, and is widely applied to the fields of electric vacuum and microelectronic technologies, laser and infrared technologies, high-energy physics, energy sources, space navigation, automobiles and the like. Can realize mutual sealing among glass, ceramics, metal and semiconductors.

Screen printing a circle of low-melting-point glass powder on the edge of the substrate 120; by adopting a laser packaging method, a PC (personal computer) is used for controlling a laser head to scan along glass powder to melt the glass powder, the substrate 120 and the cover plate 110 are bonded into an integrated structure, a closed space is formed between the cover plate 110 and the substrate 120, water vapor and air are prevented from entering, and then the full-glass packaging of the organic light emitting diode 130 is realized.

As shown in fig. 4, in an embodiment, the side walls of the cover plate 110 and the side walls of the substrate 120 are flush with the edge of the waterproof sealing frame 180 to form the side surfaces of the OLED screen, and the side surfaces of the OLED screen are provided with a silicon carbide layer 170. The chemical formula of the silicon carbide is as follows: and SiC. Pure silicon carbide is a colorless and transparent crystal and does not affect the brightness of the organic light emitting diode 130. The silicon carbide layer 170 has high density due to stable chemical properties, so that water vapor and oxygen in the air can be effectively prevented from entering the cavity 160. The silicon carbide layer 170 has good wear resistance and high hardness, and the mohs hardness is 9.5, which is second to the hardest diamond (10 grade) in the world, and can increase the strength of the OLED screen. And the silicon carbide layer 170 has high thermal conductivity and small thermal expansion coefficient, so the silicon carbide layer 170 does not obstruct the heat dissipation of the OLED screen, and the silicon carbide layer 170 does not fall off from the OLED screen due to thermal expansion.

A method of manufacturing an OLED screen, comprising:

providing a cover plate 110 and a base plate 120;

an organic light emitting diode 130 is disposed on the substrate;

arranging a sealant 150 on the inner side of the low-melting-point glass powder;

the liquid reinforcing layer 140 is filled in the area surrounded by the sealant 150; and the number of the first and second groups,

the cover plate 110 and the substrate 120 are pressed relatively, the low-melting-point glass powder and the sealant 150 are respectively melted and then solidified, and the cover plate 110 and the substrate 120 are bonded together.

In one embodiment, the cover plate 110 and the substrate 120 are made of glass according to the size of the OLED screen, and the organic layer is coated on the substrate 120. The coating method includes vacuum deposition or vacuum thermal evaporation, organic vapor deposition, ink-jet printing, and then metal cathode evaporation to fabricate the organic light emitting diode 130. A driving circuit for driving the organic light emitting diode 130, for example, including a power line, and the like, and for example, a gate line, a data line, a switching transistor, a driving transistor, a storage capacitor, and the like may be further provided on the substrate 120.

In one embodiment, a circle of low melting point glass powder with a cross-sectional width of 0.5mm is silk-screened around the side of the substrate 120 where the organic light emitting diode 130 is disposed. And coating a circle of sealant 150 with the cross section width of 0.5mm on the inner side of the low-melting-point glass powder. After the sealant 150 is cured, the liquid reinforcing layer 140 is injected into the region surrounded by the sealant 150, and the liquid is laid flat in the region surrounded by the sealant 150 by standing. Then, the cover plate 110 is covered, the edge of the cover plate 110 is flush with the edge of the substrate 120, the positions where the low-melting-point glass powder and the sealant 150 are arranged around are irradiated or heated by ultraviolet light, for example, laser heating is performed, the low-melting-point glass powder and the sealant 150 are respectively melted and cooled, the low-melting-point glass powder is cooled to form a waterproof sealing frame 180, the cover plate 110 and the substrate 120 are pressed and bonded together by the waterproof sealing frame 180 and the sealant 150, and the organic light emitting diode 130 is packaged. The method for curing the low melting point glass frit and the sealant 150 is not limited in this embodiment, and the specific curing method can be determined by those skilled in the art according to the type and corresponding properties of the low melting point glass frit and the sealant 150.

It should be noted that, a plurality of organic light emitting diodes 130 are included in one OLED screen, each organic light emitting diode 130 may be encapsulated by the waterproof sealing frame 180 and the sealant 150, or a plurality of organic light emitting diodes 130 are encapsulated together by the waterproof sealing frame 180 and the sealant 150. Under the condition that the plurality of organic light emitting diodes 130 are packaged together by the waterproof sealing frame 180 and the sealant 150, the interior of the package includes the plurality of organic light emitting diodes 130 arranged in an array, and a planar structure is integrally formed, so that the package can be applied to a device requiring whole-surface light emission, such as an OLED screen of the embodiment. The organic light emitting diode 130 includes an anode, an organic light emitting layer, and a cathode, which are sequentially stacked, and in operation, electrons are injected from the cathode and holes are injected from the anode, and the two are recombined in the organic light emitting layer and then light emission is excited. If necessary, a hole injection layer and a hole transport layer may be provided from the anode to the organic light-emitting layer, and an electron injection layer and an electron transport layer may be provided from the cathode to the organic light-emitting layer. For example, the anode is usually made of a conductive material with a high work function, such as Indium Tin Oxide (ITO) or the like; the cathode is usually made of a conductive material with low work function, such as Ag, Al, Ca, In, Li and Mg, or a composite metal with low work function (such as Mg-Ag magnesium silver). The organic light emitting diode 130 may emit red light, green light, blue light, white light, etc. when operating; for example, in order to assist in adjusting the color of light, a fluorescent layer or a color filter may be disposed on the light emitting side of the organic light emitting diode 130.

In an embodiment, the side walls of the cover plate 110 and the substrate 120 are flush with the edge of the waterproof sealing frame 180 to form the side surfaces of the OLED screen, and a silicon carbide layer 170 is disposed on the side surfaces of the OLED screen. The silicon carbide layer 170 is formed on the side surface of the OLED screen by physical or chemical vapor deposition, spraying, or the like.

In an embodiment, an electronic device 10 includes the OLED screen 100. The screen of the electronic device 10 has increased resistance to falling and is less likely to shatter.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a OLED screen, its characterized in that, includes relative apron, the base plate that sets up and is located the organic light emitting diode between apron and the base plate, bond through sealant and waterproof sealing frame seal between the edge of apron and the edge of base plate, waterproof sealing frame is located sealed gluey outside, be full of liquid enhancement layer in the sealed cavity that apron, base plate and sealed glue enclose and establish, the enhancement layer adsorbs apron and base plate respectively.

2. The OLED screen of claim 1, wherein the waterproof sealing frame is made of low-melting glass frit.

3. The OLED screen of claim 1, wherein the reinforcing layer is a transparent, water repellent or hydrophilic liquid that does not react with the cover plate, substrate, sealant, and organic light emitting diodes, the reinforcing layer submerging the organic light emitting diodes.

4. The OLED screen of claim 3, wherein the reinforcing layer includes one or more of a ketone based liquid.

5. The OLED screen of claim 3, wherein the reinforcing layer includes one or more of a pyridine-based liquid.

6. The OLED screen of claim 3, wherein the reinforcing layer includes one or more of ether based liquids.

7. The OLED screen of claim 3, wherein the reinforcing layer includes one or more of aldehyde liquids.

8. The OLED screen of claim 1, wherein the side walls of the cover plate and the substrate are flush with the edge of the waterproof sealing frame to form the side surfaces of the OLED screen, and the side surfaces of the OLED screen are provided with the silicon carbide layer.

9. The OLED screen of claim 1, wherein the cover plate and the substrate are both glass.

10. An electronic device, characterized in that it comprises an OLED screen according to any one of claims 1 to 9.

11. A method of manufacturing an OLED screen, comprising:

providing a cover plate and a substrate;

disposing an organic light emitting diode on a substrate;

arranging sealant on the inner side of the low-melting-point glass powder;

12. The method of claim 11 wherein the reinforcing layer is a transparent hydrophobic or hydrophilic liquid that does not chemically react with the cover plate, the substrate, the sealant, and the organic light emitting diode, and the reinforcing layer submerges the organic light emitting diode.

13. The method of manufacturing an OLED screen according to claim 11, wherein the side walls of the cover plate and the side walls of the substrate are flush with the edges of the waterproof sealing frame to form side surfaces of the OLED screen, and a silicon carbide layer is disposed on the side surfaces of the OLED screen.