CN107779818A - A kind of manufacture method of the OLED display screen of mask plate and the use mask plate - Google Patents

Abstract

The invention discloses a mask plate and a method for manufacturing an OLED display screen. The mask plate includes a first mask plate and a second mask plate oppositely arranged, and a plurality of arrays are arranged in a matrix on the first mask plate. A semi-circular first pattern; a plurality of semi-circular second patterns are arranged in a matrix on the second mask plate, and the first pattern and the second pattern are mirror-symmetrically arranged. The required hollow pattern can be formed by using the mask plate of the present invention, and a through hole is formed at the hollow pattern for setting a mechanical pointer, so that it is widely used in electronic products such as watches and instruments with mechanical pointers. The mask plate of the present invention is convenient to clean, reduces damage to vapor deposition patterns during the cleaning process, and reduces poor repeatability. In the present invention, the structure of the circular hollow pattern formed by the above-mentioned mask plate is only the substrate, effectively avoiding the organic material layer and the cathode layer, so that the frame glue is in direct contact with the substrate, and the bonding force between the substrate and the package back cover is enhanced. , improve the sealability of the OLED packaging structure, effectively reduce the oxygen and water vapor penetrating into the OLED, improve the performance of the OLED device, and prolong the service life of the OLED device.

Description

A mask plate and a method for manufacturing an OLED display using the mask plate

technical field

The invention relates to the field of display technology, in particular to a mask plate and a method for manufacturing an OLED display using the mask plate.

Background technique

With the widespread application of OLED, known as "dream display technology", especially the popularity of wearable products, such as smart watches, bracelets, etc., in addition to basic functional requirements for electronic products, consumers are more pursuing individuality and Fashion. However, most of the traditional OLED display watches are stereotyped in shape, and most of them use pure digital display, which lacks product recognition and aesthetics. With the increasing demand of consumers for the experience of electronic products, the market demand for OLED display products with mechanical pointers will also increase.

CN201620904902.2 discloses a mask plate and OLED for OLED evaporation. The mask plate includes an outer frame and a screen installed in the outer frame. Several evaporation patterns are arranged on the screen, and each evaporation pattern includes an inner shielding area, an outer shielding area, and a connection A number of connecting lines between the inner shielding area and the outer shielding area; OLED luminescent materials with hollow patterns can be evaporated according to requirements, so that OLED can be provided with mechanical pointers in the area of hollow patterns, so that it can be widely used in watches, A display terminal with a mechanical pointer function, such as an instrument. But on the one hand, for dot-matrix OLED products, the connection line of this application needs to be set at the PI line position between two adjacent pixels (so as not to affect the display effect), and its width is generally not greater than 25um (by PI width decision), the line width of the connecting line is extremely small, and the cleaning of the mask plate in the later stage can easily cause deformation and be scrapped; on the other hand, due to the need to set up the connecting line, it is inevitable that some organic materials will be deposited on the The connecting line makes the mask plate dirty and affects the quality of the product. This application cannot realize the entire screen coating of the display area.

Contents of the invention

In order to make up for the defects of the prior art, the present invention provides a method for manufacturing a mask and an OLED display. The mask has a long service life and is not easily scrapped. The OLED display can be provided with mechanical pointers and is widely used in Electronic products such as mechanical pointer watches and instruments can not only enhance the aesthetics of the products, but also satisfy consumers' sense of experience to a certain extent, and at the same time realize the entire screen coating of the display area.

The technical problem to be solved by the present invention is realized through the following technical solutions:

A mask plate is used for evaporating OLED light-emitting materials, including a first mask plate and a second mask plate oppositely arranged, and a plurality of semi-circular first mask plates are arranged in a matrix on the first mask plate. A pattern: a plurality of semi-circular second patterns are arranged in a matrix on the second mask plate, and the first pattern and the second pattern are mirror-symmetrically arranged.

A method for manufacturing an OLED display, comprising the steps of:

Step 1: providing a substrate, the substrate including a display area, a frame area surrounding the display area, and a drilling area in the middle of the display area;

Step 2: providing a mask plate as claimed in claim 1, sequentially vapor-depositing an organic light-emitting layer and a cathode layer on the transparent anode layer on the display area of the substrate to form a hollow pattern to make an OLED device, wherein the vapor-deposition The organic light-emitting layer and the cathode layer are evaporated successively through the first mask and the second mask, and the hollow pattern is circular and corresponds to the drilled area;

Step 3: Provide a package cover plate, a ring-shaped groove is etched on the package cover plate corresponding to the position of the display area; the surface of the package cover plate corresponding to the frame area and the drilling area of the substrate Coating a sealing material; coating a desiccant filling in the annular groove on the package cover;

Step 4: relatively bonding the substrate and the package cover;

Step 5: curing the sealing material, thereby completing the packaging of the packaging cover plate to the substrate;

Step 6: Make through holes in the above drilled area for installing the mechanical hands.

Further, a metal layer is provided on the substrate corresponding to the frame area, and an insulating layer covering the metal layer and the substrate is provided on the metal layer.

Further, an annular spacer column layer is provided on the substrate corresponding to the drilling area.

Further, the diameter of the through hole is 1-2 mm.

Further, drilling, laser, or chemical etching is used to make through holes in the above-mentioned drilling area.

Further, the sealing material is sealant.

Further, the frame glue is UV glue.

Further, the sealing material is cured by irradiating the sealing material with ultraviolet light.

Further, the desiccant filler is a liquid desiccant.

The present invention has following beneficial effects:

The mask plate of the invention is convenient to clean, reduces damage to vapor deposition patterns during the cleaning process, reduces poor repeatability, improves product quality and reduces loss caused by mask plate maintenance.

The whole screen coating of the display area can be realized by adopting the mask plate of the invention.

In the present invention, the structure of the circular hollow pattern formed by the above-mentioned mask plate is only the substrate, effectively avoiding the organic material layer and the cathode layer, so that the frame glue is in direct contact with the substrate, and the bonding force between the substrate and the package back cover is enhanced. , improve the sealing of the OLED packaging structure, effectively reduce the oxygen and water vapor penetrating into the OLED, improve the performance of the OLED device, and prolong the service life of the OLED device.

The OLED display screen of the present invention can be equipped with mechanical pointers, and is widely used in electronic products such as watches and instruments with mechanical pointers. It can not only enhance the aesthetics of products, but also satisfy consumers' sense of experience to a certain extent.

Description of drawings

Fig. 1 is the partially enlarged schematic diagram of mask plate and mask plate provided by the present invention;

Fig. 2 is the structural representation of OLED display screen of the present invention;

FIG. 3 is a cross-sectional view along line A-A of FIG. 2 .

In the figure: 1. Substrate, 11. Display area, 12. Frame area, 13. Drilling area, 111. Transparent anode layer, 112. Organic light-emitting layer, 113. Cathode layer, 2. Encapsulation cover plate, 3. Sealing material , 4, desiccant filling, 5, through holes, 7, the first mask, 8, the second mask, 9, the first pattern, 10, the second pattern.

Detailed ways

The present invention will be described in detail below in conjunction with examples, which are only preferred implementations of the present invention, and are not limitations of the present invention.

Example 1

A mask plate is used for evaporating OLED light-emitting materials, including a first mask plate and a second mask plate oppositely arranged, the first mask plate includes a first substrate and is arranged in a matrix on the Several semi-circular first patterns on the first substrate; the second mask plate includes a second substrate and several semi-circular second patterns arranged in matrix on the second substrate , the first pattern and the second pattern are mirror-symmetrically arranged.

The present invention adopts the above-mentioned mask plate, which does not need to be provided with a very small connection line, which is convenient for cleaning, reduces damage to the vapor deposition pattern during the cleaning process, reduces poor repeatability, improves product quality and the loss caused by mask plate maintenance, Improve the service life of the mask plate.

Example 2

A method for manufacturing an OLED display, comprising the steps of:

Step 1: Provide a substrate, the substrate includes a display area, a frame area arranged around the display area, and a drilling area located in the middle of the display area; a metal layer is provided on the substrate corresponding to the frame area, and the An insulating layer covering the metal layer and the substrate is provided on the metal layer; an annular isolation post layer is provided on the substrate corresponding to the drilling area.

The substrate is preferably a glass substrate; the metal layer refers to the peripheral leads in the frame area, which is completed by a photolithography process, and the material of the metal layer may be Mo/Al/Mo, but is not limited thereto.

The insulating layer protects the lead wires around the frame area. The insulating layer isolates and forms pixel grids in the display area.

The purpose of setting the ring-shaped isolation column layer is to prevent the frame glue at the drilled hole from entering the display area when the substrate is bonded to the package cover plate, and to prevent the organic material and cathode layer from entering the drilled hole area during evaporation and affecting the adhesion of the frame glue. . The formation of the annular spacer column layer is formed by photolithography process.

Step 2: Provide a mask plate as described in Embodiment 1, sequentially vapor-deposit an organic light-emitting layer and a cathode layer on the transparent anode layer on the display area of the substrate to form a hollow pattern,

The first mask plate and the second mask plate are used to vapor-deposit successively, and the organic light-emitting layer and the cathode layer are sequentially vapor-deposited on the transparent anode layer on the display area of the substrate to form a hollow pattern to make an OLED device. The hollow pattern is circular and corresponds to the drilled area; wherein, the vapor-deposited organic light-emitting layer is formed by successively vapor-depositing through the first mask and the second mask, and the vapor-deposited cathode layer is also formed through the first mask and the second mask. The second mask plate is successively formed by vapor deposition;

Wherein, the transparent anode layer on the substrate is completed by a photolithography process.

The material of the cathode layer is preferably metal Al.

Step 3: Provide a package cover plate, a ring-shaped groove is etched on the package cover plate corresponding to the position of the display area; the surface of the package cover plate corresponding to the frame area and the drilling area of the substrate Coating a sealing material; coating a desiccant filling in the annular groove on the package cover;

Wherein, the sealing material is preferably frame glue, and the frame glue is preferably UV glue.

The desiccant filler is a liquid desiccant or curable desiccant, preferably, the desiccant filler is a liquid desiccant, and the liquid desiccant can be a polymer containing aluminum, such as [R-O-Al= O] n (n ≥ 1) and so on. The desiccant filler is applied to the inner space enclosed by the sealing material between the package cover plate and the substrate, so as to achieve the effect of blocking water vapor.

Step 4: relatively bonding the substrate and the package cover;

Step 5: curing the sealing material, thereby completing the packaging of the packaging cover plate to the substrate;

In the present invention, it is preferable to irradiate the sealing material with ultraviolet light to cure it.

Step 6: Make a through hole in the above-mentioned drilled area for installing a mechanical pointer, so that it can be widely used in display terminals with a mechanical pointer function such as watches and meters.

Wherein, the present invention may use drilling, laser, or chemical etching to form a through hole in the above-mentioned drilling area, but is not limited thereto.

In the present invention, the diameter of the through hole is preferably 1-2 mm.

Because OLED is very sensitive to water vapor and oxygen, if water vapor or oxygen penetrates into the OLED device, it will corrode the organic functional layer and electrode material of the OLED device, seriously affecting the life of the OLED device. Therefore, in order to prolong the life of the OLED device and improve the stability of the OLED device The OLED device needs to be encapsulated to form an OLED encapsulation structure, but the prior art has the disadvantage of poor encapsulation. In the present invention, since the structure of the above-mentioned hollow pattern only has the substrate, the organic material layer and the cathode layer are effectively avoided, so that the sealant is in direct contact with the substrate, the bonding force between the substrate and the packaging cover is enhanced, and the sealing of the OLED packaging structure is improved. It effectively reduces the oxygen and water vapor penetrating into the OLED, improves the performance of the OLED device, and prolongs the service life of the OLED device.

The above-described embodiments only express the implementation manner of the present invention, and its description is more specific and detailed, but it should not be interpreted as limiting the scope of the patent of the present invention, as long as the technical solutions obtained in the form of equivalent replacement or equivalent transformation are adopted , should fall within the protection scope of the present invention.

Claims (10)

1. A mask plate is used to vapor-deposit the luminescent material of OLED, it is characterized in that it comprises a first mask plate and a second mask plate oppositely arranged, and a matrix is arranged on the first mask plate with several A semi-circular first pattern; a plurality of semi-circular second patterns are arranged in a matrix on the second mask plate, and the first pattern and the second pattern are mirror-symmetrically arranged. 2. A method for manufacturing an OLED display, comprising the steps of: Step 1: providing a substrate, the substrate including a display area, a frame area surrounding the display area, and a drilling area in the middle of the display area; Step 2: providing a mask plate as claimed in claim 1, sequentially vapor-depositing an organic light-emitting layer and a cathode layer on the transparent anode layer on the display area of the substrate to form a hollow pattern to make an OLED device, wherein the vapor-deposition The organic light-emitting layer and the cathode layer are evaporated successively through the first mask and the second mask, and the hollow pattern is circular and corresponds to the drilled area; Step 3: Provide a package cover plate, a ring-shaped groove is etched on the package cover plate corresponding to the position of the display area; the surface of the package cover plate corresponding to the frame area and the drilling area of the substrate Coating a sealing material; coating a desiccant filling in the annular groove on the package cover; Step 4: relatively bonding the substrate and the package cover; Step 5: curing the sealing material, thereby completing the packaging of the packaging cover plate to the substrate; Step 6: Make through holes in the above drilled area for installing the mechanical hands. 3. The method for manufacturing an OLED display according to claim 2, wherein a metal layer is provided on the substrate corresponding to the frame area, and an insulating layer covering the metal layer and the substrate is provided on the metal layer . 4 . The method for manufacturing an OLED display according to claim 2 , wherein an annular spacer column layer is provided on the substrate corresponding to the drilled hole area. 5. The method for manufacturing an OLED display according to claim 2, wherein the diameter of the through hole is 1-2 mm. 6 . The method for manufacturing an OLED display screen according to claim 2 , wherein drilling, laser, or chemical etching is used to form a through hole in the drilled area. 7 . 7. The method for manufacturing an OLED display screen according to claim 2, wherein the sealing material is a sealant. 8. The method for manufacturing an OLED display screen according to claim 7, wherein the sealant is UV glue. 9. The method for manufacturing an OLED display screen according to claim 2, wherein the sealing material is irradiated with ultraviolet light to be cured. 10. The method for manufacturing an OLED display screen according to claim 2, wherein the desiccant filler is a liquid desiccant.