A screen plate for improving frit sag and a method for manufacturing the screen plate

Abstract

The application discloses a screen plate for improving Frit glue depression and a screen plate manufacturing method, which comprises a metal screen frame, outer yarn, inner yarn, Frit glue and a glass cover plate. The metal screen frame is provided with screen yarn, the screen yarn comprises the inner yarn and the outer yarn provided outside the inner yarn, the connection between the inner yarn and the outer yarn is supplemented by adhesive tape, which plays a role in connecting the inner yarn and the outer yarn, the inner yarn is divided into an impermeable area and a plurality of groups of Frit glue permeable areas, the inner yarn of the impermeable area is coated with a photosensitive emulsion for shielding, and is prepared by exposure and development, and the inner yarn of the Frit glue permeable area is not coated with the photosensitive emulsion, when screen printing, the Frit glue can fall on the glass cover plate through the position. The application subdivides the position of the screen plate without coating the photosensitive emulsion into a plurality of areas, each area is respectively coated with the photosensitive emulsion with different thicknesses, the Frit glue depression problem is improved, the OLED packaging efficiency is greatly improved, and the service life of the product is finally improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of OLED packaging, and particularly relates to a screen plate for improving Frit glue depression and a screen plate manufacturing method. BACKGROUND

[0002] OLED is called Organic Light-Emitting Diode, and the basic structure is to make a layer of organic material light-emitting layer on an indium tin oxide (ITO) glass, and then cover a low work function metal electrode on the light-emitting layer. Under the driving of external voltage, positive holes and cathode electrons will combine in the light-emitting layer to produce energy and emit light. Due to the different material properties, R, G and B three primary colors are generated to form the basic colors. Packaging is a key process of OLED, and there are two camps for existing OLED packaging: hard plate packaging and flexible packaging. Although flexible packaging will gradually dominate the market in the future, for the existing one, hard plate packaging is still the main technology of OLED packaging. Among them, Frit packaging is the most common packaging method applied to small and medium-sized screens. The good or bad of OLED packaging will cause water and oxygen in the environment to enter the panel inside, and the OLED organic material is very sensitive to water and oxygen, so it directly affects the service life of the product. Generally, the WVTR of OLED after packaging is required to be less than 10-5g / m 2 / day.

[0003] The Frit packaging process is to print Frit glue on the glass cover plate through screen printing, remove the solvent and shape through pre-burning, and finally bond the glass cover plate and the substrate through laser sintering. The Frit glue formed after the existing screen printing screen printing is often concave in the middle and low on both sides due to the flowability of the wet glue, which is commonly called saddle-shaped. The quality of the subsequent laser sintering depends on the shape, and the smoother the Frit glue shape, the better the packaging effect. Therefore, how to improve the depression shape is an important problem. Therefore, we propose a screen plate for improving Frit glue depression and a screen plate manufacturing method to solve the problems mentioned in the above background. SUMMARY

[0004] The purpose of the present application is to provide a screen plate for improving Frit glue depression and a screen plate manufacturing method to solve the problems mentioned in the above background.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a screen plate for improving Frit glue depression, comprising a metal screen frame, outer yarn, inner yarn, Frit glue and a glass cover plate, the metal screen frame is provided with screen yarn, the screen yarn comprises inner yarn and outer yarn provided outside the inner yarn, the connection between the inner yarn and the outer yarn is supplemented by adhesive tape, which plays a connecting role between the inner yarn and the outer yarn, the inner yarn is divided into an impermeable area and a plurality of groups of Frit glue permeable areas, the inner yarn in the impermeable area is coated with a light-sensitive emulsion for shielding, and is prepared by exposure and development, and the inner yarn in the Frit glue permeable area is not coated with a light-sensitive emulsion, and when screen printing, the Frit glue can fall on the glass cover plate through this position.

[0006] The material of the metal screen frame is Al, the material of the outer yarn is polyester fiber, and the inner yarn is SUS material.

[0007] The width d of the inner yarn in the Frit glue permeable area without emulsion coating is 0.2-3mm, and the width d is the Frit glue width of the Frit glue.

[0008] A manufacturing method of a screen plate for improving Frit glue depression, specifically comprising the following steps:

[0009] S1, screen stretching: fixing the screen yarn on the screen frame;

[0010] S2, tension check: checking the tension of the screen yarn, when the tension is insufficient or too large, returning to step S1 to fix the screen yarn on the screen frame again until the tension meets the requirements;

[0011] S3, coating light-sensitive emulsion: setting an impermeable area and a plurality of groups of Frit glue permeable areas on the inner yarn of the screen yarn, coating the light-sensitive emulsion on the inner yarn in the impermeable area for shielding, and the inner yarn in the Frit glue permeable area is not coated with a light-sensitive emulsion, and when screen printing, the Frit glue can fall on the glass cover plate through this position;

[0012] S4, development: the light-sensitive emulsion is prepared by exposure and development, and then the screen yarn is cleaned and baked.

[0013] Compared with the prior art, the present application has the following beneficial effects: the screen plate for improving Frit glue depression and the manufacturing method of the screen plate provided by the present application, the height of the Frit glue is related to the thickness of the light-sensitive emulsion, the position of the screen plate without light-sensitive emulsion is subdivided into multiple areas, each area is coated with light-sensitive emulsion of different thickness, the Frit glue depression problem is improved, the OLED packaging efficiency is greatly improved, and the service life of the product is ultimately improved. The manufacturing method of the screen plate for improving Frit glue depression provided by the present application can also be used in the solar cell industry and the microelectronic industry. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Structure diagram of the screen plate for improving Frit glue depression of the present application;

[0015] Figure 2 Schematic diagram of the opening rate of the present application;

[0016] Figure 3 Schematic diagram of the Frit glue falling on the glass cover plate during screen printing of the present application;

[0017] Figure 4 Schematic diagram of the Figure 1 Enlarged view of the part E;

[0018] Figure 5 Schematic diagram of the Figure 4 Enlarged view of the part F of the prior design;

[0019] Figure 6 Schematic diagram of the design of the present application Figure 4 Enlarged view of the part F of the design of the present application;

[0020] Figure 7 Flowchart of the manufacturing method of the screen plate for improving Frit glue depression of the present application.

[0021] In the figure: 1, metal screen frame; 2, outer yarn; 3, joint; 4, Frit glue permeable area; 5, inner yarn; 6, Frit glue; 7, glass cover plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] The present application provides a screen plate for improving Frit glue depression, comprising a metal screen frame 1, an outer yarn 2, an inner yarn 5, Frit glue 6, and a glass cover plate 7. The metal screen frame 1 is provided with screen yarn, which comprises the inner yarn 5 and the outer yarn 2 provided outside the inner yarn 5. The joint 3 between the inner yarn 5 and the outer yarn 2 is supplemented with adhesive tape, which serves to connect the inner yarn 5 and the outer yarn 2. The inner yarn 5 is divided into an impermeable area and a plurality of Frit glue permeable areas 4. The inner yarn 5 in the impermeable area is coated with a light-sensitive emulsion for shielding, and is prepared by exposure and development. The inner yarn 5 in the Frit glue permeable area 4 is not provided with a light-sensitive emulsion. During screen printing, the Frit glue 6 can fall on the glass cover plate 7 through this position.

[0024] Figure 1 A screen plate for improving the depression of Frit glue mentioned in the present application, wherein:

[0025] The metal screen frame 1de is generally made of Al, which is light in weight and convenient to carry;

[0026] The outer yarn 2 is generally made of polyester fiber, which has a certain elasticity;

[0027] The inner yarn 5 is generally made of SUS material, which is coated with a photosensitive emulsion and prepared by exposure and development. This area is a non-permeable area, so the emulsion needs to be coated to play a shielding role;

[0028] The junction 3 between the inner yarn 5 and the outer yarn 2 generally uses a high-strength adhesive tape to connect the outer yarn 2 and the inner yarn 5;

[0029] The Frit glue permeable area 4 has no emulsion, so when screen printing, the Frit glue 6 can permeate this position and fall on the glass cover plate 7.

[0030] Figure 2 The wire diameter of the inner yarn 5 is represented by D, the length of the through hole is L, A represents the screen hole through hole area, and the dashed box B represents the screen area; the opening rate = A / B × 100% = L^2 / ((L+D)^2 × 100%.

[0031] Figure 3 C is the thickness of the inner yarn 5, and T is the height of the photosensitive emulsion; the glue amount (H) = C × opening rate (O%) + T;

[0032] Generally, D, L, C, and T are known quantities, so the value of the glue amount H can be obtained, and this value is the final glue height of the Frit glue 6.

[0033] Existing experiments and experience can show that when using different emulsions, the Frit glue 6 after screen printing has different appearances. The smaller the emulsion T, the smaller the glue depression, that is, the smaller the difference between the highest point and the lowest point of the saddle shape, but at the same time, the overall glue height will also decrease, and the overall glue height is often related to product design, generally needs to be greater than the design value, therefore, it is necessary to consider that the overall glue height can meet the demand and reduce the depression difference, which is a difficulty.

[0034] Figure 4 For Figure 1 The local enlarged view at E shows a panel, and it should be noted that the rectangle shown in the figure is not limited to the rectangle, circle, ellipse or other special shape is within the scope of the present application.

[0035] The inner yarn 5 of the non-permeable area is coated with a photosensitive emulsion for shielding;

[0036] The width d of the inner yarn 5 without coating emulsion at the Frit glue area 4 is 0.2-3mm, and the width d is the Frit glue width of the Frit glue 6.

[0037] Figure 5 For Figure 4 The local enlarged view at the middle F is the schematic view of the prior art. The prior art is full opening at the required Frit glue width d. Since the wet glue has flowability, it often presents obvious depression after falling on the glass cover plate 7, and the depression difference Ah is generally 0.6-2um, which affects the packaging effect.

[0038] Figure 6 The schematic view of the present application. The present application divides the total width d into multiple areas (suggested to be 3 or 5 or 7), and the left and right sides are symmetrical about the middle, and different thicknesses of the photosensitive emulsion are coated in each area to solve the Frit glue depression problem.

[0039] The following is illustrated by dividing into three areas. In the left a1, the middle a2 and the right a3 three areas, a2 is in the middle, a1 and a3 are symmetrical about a2, and a1=a3=(1 / 8-1 / 3)a2. The a1 and a3 areas near the saddle-shaped peak are further divided into equal-interval spaces, and a thin emulsion T1, T3 is coated every certain width, and T1, T3 is generally 1-8um, that is, the coated emulsion / uncoated emulsion is arranged in an interleaved array. The a2 area is also further divided into equal-interval spaces, and a later emulsion T2 is coated every certain width, and T2 is generally 3-10um, and the specific selection of T1, T2 and T3 can be adjusted according to subsequent experiments. In this way, the Frit glue depression (saddle-shaped) can be greatly improved.

[0040] A manufacturing method of a screen plate for improving Frit glue depression, specifically comprising the following steps:

[0041] S1, screen stretching: fixing the screen yarn on the screen frame 1;

[0042] S2, tension check: checking the tension of the screen yarn, and returning to step S1 to re-fix the screen yarn on the screen frame 1 until the tension meets the requirements when the tension is insufficient or too large;

[0043] S3, coating photosensitive emulsion: setting the non-permeable area and a plurality of groups of permeable Frit glue areas 4 on the inner yarn 5 of the screen yarn, coating the photosensitive emulsion with shielding effect on the non-permeable area of the inner yarn 5, and no photosensitive emulsion on the inner yarn 5 at the permeable Frit glue area 4, so that the Frit glue 6 can fall on the glass cover plate 7 at this position when screen printing;

[0044] S4, development: the photosensitive emulsion is prepared by exposure and development, and then the screen yarn is cleaned and baked.

[0045] Compared with the prior art, the present application is related to the height of Frit glue 6 and the thickness of the photosensitive emulsion. The present application subdivides the position of the screen plate where the photosensitive emulsion is not coated into multiple areas, and each area is coated with photosensitive emulsion of different thickness. The present application improves the Frit glue depression problem, greatly improves the OLED packaging efficiency, and ultimately improves the product life. The present application also provides a method for manufacturing a screen plate for improving Frit glue depression, which can also be used in the solar cell industry, the microelectronic industry, the display technology industry, and the precision screen printing industry.

[0046] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. shall be included in the protection scope of the present application.

Claims

1. A mesh plate for improving Frit adhesive depressions, comprising a metal mesh frame (1), outer mesh (2), inner mesh (5), Frit adhesive (6), and a glass cover plate (7), characterized in that: The metal screen frame (1) is provided with screen gauze, the screen gauze includes inner gauze (5) and outer gauze (2) arranged outside the inner gauze (5), the joint (3) between the inner gauze (5) and the outer gauze (2) is bonded with adhesive tape, which connects the inner gauze (5) and the outer gauze (2), the inner gauze (5) is divided into an impermeable area and a plurality of groups of permeable Frit glue areas (4), the inner gauze (5) in the impermeable area is coated with a light-sensitive emulsion for shielding, and is prepared by exposure and development, and the inner gauze (5) in the permeable Frit glue area (4) is not coated with a light-sensitive emulsion, when screen printing, Frit glue (6) can fall on the glass cover plate (7) through this position; The manufacturing method of the screen plate for improving Frit glue depression, specifically includes the following steps: S1, screen stretching: fixing the screen gauze on the screen frame (1); S2, tension check: checking the tension of the screen gauze, if the tension is insufficient or too large, returning to step S1 to fix the screen gauze on the screen frame (1) again until the tension meets the requirements; S3, coating the light-sensitive emulsion: setting the impermeable area and a plurality of groups of permeable Frit glue areas (4) on the inner gauze (5) of the screen gauze, coating the light-sensitive emulsion on the inner gauze (5) in the impermeable area for shielding, and the inner gauze (5) in the permeable Frit glue area (4) is not coated with a light-sensitive emulsion, when screen printing, Frit glue (6) can fall on the glass cover plate (7) through this position; S4, development: the light-sensitive emulsion is prepared by exposure and development, and then the screen gauze is cleaned and baked.

2. The screen plate for improving the recess of Frit glue according to claim 1, wherein: The material of the metal screen frame (1) is Al, the material of the outer gauze (2) is polyester fiber, and the inner gauze (5) is SUS material.

3. The screen plate for improving Frit recess according to claim 1, wherein: The width d of the inner gauze (5) without coating the emulsion in the permeable Frit glue area (4) is 0.2-3mm, and the width d is the Frit glue width of the Frit glue (6).

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