CN212485362U - Display screen packaging structure - Google Patents
Display screen packaging structure Download PDFInfo
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- CN212485362U CN212485362U CN202021502354.3U CN202021502354U CN212485362U CN 212485362 U CN212485362 U CN 212485362U CN 202021502354 U CN202021502354 U CN 202021502354U CN 212485362 U CN212485362 U CN 212485362U
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Abstract
The utility model discloses a display screen packaging structure, include: the OLED device comprises a cover plate, an OLED device layer and a TFT backboard; the OLED device layer is arranged on the TFT back plate, and the cover plate is covered on one side of the TFT back plate, which is provided with the OLED device; the OLED device comprises a cover plate and a TFT backboard, and is characterized in that a first high-temperature-resistant adhesive and a Frit adhesive are arranged on the periphery of an OLED device layer, the Frit adhesive is arranged on the first high-temperature-resistant adhesive, and the first high-temperature-resistant adhesive and the Frit adhesive are used for connecting the cover plate and the TFT backboard. The fit condition of the Frit glue and the TFT back plate is improved, the first high-temperature-resistant adhesive has strong adhesive force and no corrosiveness, and the adhesive property is kept at high temperature. Utilize the heat that first high temperature resistant adhesive separation Frit glue produced when laser welding, the metal wire does not receive high temperature damage on the protection TFT backplate, strengthens the water oxygen separation ability of display screen encapsulation simultaneously to this life who improves the OLED display screen.
Description
Technical Field
The utility model relates to a display screen encapsulation field especially relates to a display screen packaging structure.
Background
In recent years, Organic Light Emitting Diodes (OLEDs) have become a new very popular flat display product at home and abroad, and due to the characteristics of self-luminescence, wide viewing angle (up to more than 175 degrees), short reaction time (1us), high luminous efficiency, wide color gamut, low operating voltage (3-10V), thin panel (thickness can be less than 1mm), large-size flexible panel and simple manufacturing process, the OLED display has the potential of low cost (predicted to be 20% cheaper than TFT-LCD), and is known as an obvious flat display product in the 21 st century.
The key difficulty of the emerging display devices is the development and application of self-luminescent materials, which determine the luminous efficiency and display effect of the display, and the greatest difficulty of these luminescent materials is that they have high sensitivity to water and oxygen and are easy to react with water and oxygen. In order to prepare the display screen, the damage of water and oxygen to the organic light-emitting material must be prevented, and as the light-emitting material which is not influenced by the water and oxygen cannot be found at present, the solution in the industry at present is to reliably encapsulate an OLED device and encapsulate the OLED light-emitting material in a closed space with extremely high water and oxygen blocking capacity (WVTR ═ 10E-4(g/m 2. day)). An OLED packaging technology that is reliable, simple in manufacturing process, and capable of realizing large-scale industrialization is a great technical difficulty in the industry.
The mainstream packaging technology today is: laser Frit (glass paste) package, Dam & Fill (UV paste & filler) package, single layer film package, multilayer film package, and the like. The Laser Frit glue packaging technology is developed more mature in the OLED packaging technology and is the most common technology, and has the following characteristics:
a) the water and oxygen blocking capacity is good, and the manufacturing process is simple;
b) the dependence on sealing materials (Frit glue performance) is high, and the packaging method is suitable for packaging small and medium-sized display screens;
c) and the Frit glue is pre-sintered and then welded by laser, so that the cover plate and the back plate are completely attached.
However, Frit glue suffers from three major problems with laser welding, as follows:
a) in the laser welding process, the generated temperature is between 450 and 500 ℃, and the high temperature can cause the phenomenon of burning of the metal wire on the TFT backboard, so that the conductivity of the metal wire is reduced to some extent or even fails;
b) during the preparation process of the Frit glue, uneven saddle lines can appear, so that the fit condition of the Frit glue and the TFT back plate is poor after welding, and a gap is generated between the Frit glue and the TFT back plate, so that water and oxygen invade, and finally the service life of a display is reduced or the product fails;
c) the Frit glue is not sufficiently welded due to the uneven temperature of the laser welding.
SUMMERY OF THE UTILITY MODEL
Therefore, a display screen packaging structure is needed to be provided, so that metal wires on a TFT backboard are prevented from being burnt at high temperature in laser welding, and meanwhile, the water and oxygen blocking capacity of display screen packaging is enhanced, so that the service life of an OLED display screen is prolonged.
In order to achieve the above object, the present application provides a display screen packaging structure, including: the OLED device comprises a cover plate, an OLED device layer and a TFT backboard; the OLED device layer is arranged on the TFT back plate, and the cover plate is covered on one side of the TFT back plate, which is provided with the OLED device;
the OLED device comprises a cover plate and a TFT backboard, and is characterized in that a first high-temperature-resistant adhesive and a Frit adhesive are arranged on the periphery of an OLED device layer, the Frit adhesive is arranged on the first high-temperature-resistant adhesive, and the first high-temperature-resistant adhesive and the Frit adhesive are used for connecting the cover plate and the TFT backboard.
Further, still include: a second high temperature resistant adhesive; the second high-temperature-resistant adhesive is arranged on the middle part of the first high-temperature-resistant adhesive, and the cross section of the second high-temperature-resistant adhesive is an arc-shaped bulge.
Furthermore, grooves are formed in the TFT backboard around the OLED device layer, and the first high-temperature-resistant adhesive, the second high-temperature-resistant adhesive and the Frit adhesive are arranged in the grooves.
Different from the prior art, the technical scheme improves the fitting condition of the Frit adhesive and the TFT back plate, and the material adopted by the first high-temperature-resistant adhesive has strong adhesive force, has no corrosion to a machine body and the TFT back plate, can keep good adhesive property at high temperature, and has long service life. Meanwhile, the first high-temperature-resistant adhesive is used for blocking heat generated by the Frit adhesive during laser welding, so that the metal wire on the TFT backboard is protected from being damaged by high temperature, and the water and oxygen blocking capacity of the display screen packaging is enhanced, so that the service life of the OLED display screen is prolonged.
Drawings
Fig. 1 is a structural diagram of the display screen packaging structure;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a structural view of the second high temperature resistant adhesive;
fig. 4 is a step diagram of the packaging method of the display screen packaging structure.
Description of reference numerals:
1. a TFT backplane; 2. an OLED device layer; 3. a cover plate;
11. a trench; 12. a roughened portion; 13. a high temperature resistant adhesive; 14. frit glue;
131. a first high temperature resistant adhesive; 132. a second high temperature resistant adhesive.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 4, the present embodiment provides a method for packaging a display screen package structure, including the steps of: coating a first high-temperature-resistant adhesive on the periphery of an OLED device layer of the TFT backboard; coating Frit glue on the cover plate; the TFT back plate of the cover plate and the first high-temperature-resistant adhesive are jointed in a pair mode, and the Frit glue is jointed with the first high-temperature-resistant adhesive; pre-curing the first high temperature resistant adhesive; and welding the Frit glue by laser, and finally curing the first high-temperature-resistant adhesive through the conduction temperature of the Frit glue. In this embodiment, it should be noted that the first high temperature resistant adhesive and the Frit adhesive are wound around the periphery of the OLED device, and a first high temperature resistant adhesive 131 is further disposed between the Frit adhesive 14 and the TFT backplane 1; specifically, a circle of Frit glue 14 surrounds the OLED device layer 2, and a first high temperature resistant adhesive 131 is disposed below the Frit glue 14, in some embodiments, a circle of UV frame glue surrounds the Frit glue 14, and the UV frame glue may be disposed on the extension of the cover plate 3. In order to prevent the circuit board from being damaged by the heat absorbed by the Frit glue 14 during laser welding, a first high temperature resistant adhesive 131 is coated between the Frit glue 14 and the TFT backplane 1 for absorbing or blocking the heat generated during laser welding, so as to protect the TFT backplane 1 from being damaged. The cover plate 3 is a CG cover plate. Above-mentioned technical scheme has improved the laminating condition of Frit glue 14 and TFT backplate 1, the material that first high temperature resistant adhesive 131 adopted not only has stronger adhesive force and to organism, TFT backplate 1 noncorrosive, can keep good bonding property under high temperature, long service life moreover. Meanwhile, the first high-temperature-resistant adhesive 131 is used for blocking heat generated by the Frit glue 14 during laser welding, so that metal wires on the TFT backboard 1 are protected from being damaged by high temperature, and the water and oxygen blocking capability of display screen packaging is enhanced, so that the service life of the OLED display screen is prolonged.
In order to eliminate the saddle-shaped structure when the Frit glue 14 is coated, the method further comprises the following steps after the step of coating the first high-temperature-resistant adhesive on the periphery of the OLED device layer of the TFT backboard: coating a second high temperature resistant adhesive 132; the cross section of the second high temperature resistant adhesive 132 is an arc-shaped protrusion, the second high temperature resistant adhesive 132 is located in the middle of the first high temperature resistant adhesive 131, and the width of the second high temperature resistant adhesive 132 is smaller than that of the first high temperature resistant adhesive 131. It should be noted that the second high temperature resistant adhesive 132 and the first high temperature resistant adhesive 131 are both high temperature resistant adhesives 13, and the high temperature resistant adhesives 13 are inorganic adhesives capable of withstanding high temperatures of more than 600 degrees celsius, so as to block heat conduction of the Frit glue, so as to protect the metal wires on the TFT backplane from high temperature damage. In practical operation, if the first high temperature resistant adhesive 131 is directly attached to the Frit rubber 14, the Frit rubber 14 forms a saddle-shaped cross section with a low middle and two high sides on the cover plate due to factors such as gravity and coating method, so that air is generated in the middle of the first high temperature resistant adhesive 131 and the Frit rubber 14 after the cover plate 3 is covered, and after the package is completed, a gap is generated between the interfaces where the first high temperature resistant adhesive 131 and the Frit rubber 14 are in contact with each other, so that water and oxygen invade, and finally the service life of the display is reduced or the product is failed. After the second high temperature resistant adhesive 132 is attached to the Frit glue, the second high temperature resistant adhesive 132 fills the saddle-shaped recessed area of the Frit glue, so that the original recessed area is flush with the two ends, and the recess in the middle of the saddle shape is eliminated, thereby preventing water and oxygen from invading, and finally causing the service life of the display to be reduced or the product to be invalid.
Referring to fig. 3, further, a second refractory adhesive 132 is coated using a Dispenser coating apparatus, the second refractory adhesive 132 is coated to have a width of 0.3mm and a height of 0.2um, and the first refractory adhesive 131 is coated to have a width of 2mm and a height of 1 um. The materials used for the first high temperature resistant adhesive 131 and the second high temperature resistant adhesive 132 are the same. In the embodiment, the Frit glue 14 has a glue width of 0.5mm and a glue height of 5 um. The seal effect is enhanced by using a second high temperature adhesive 132 to compensate for the saddle line structure of the Frit glue 14 during the screen printing process.
In the present embodiment, the high-temperature resistant inorganic binder 13 includes: a first high temperature resistant adhesive 131, a second high temperature resistant adhesive 132; the first high-temperature resistant adhesive 131 and the second high-temperature resistant adhesive 132 are made of inorganic copper oxide materials, the high-temperature resistant inorganic adhesive 13 is a high-temperature resistant inorganic nano composite adhesive prepared by inorganic nano materials through polycondensation, and a suspension dispersion system with a neutral pH value of the adhesive is obtained through screening of component proportion and preparation process parameters, so that the adhesive is strong in adhesive force, free of corrosion to an organism, capable of keeping good adhesive property at high temperature and long in service life. Of course, in some embodiments, an auxiliary curing agent and a drying agent may be further added to the first high temperature resistant adhesive 131 and the second high temperature resistant adhesive 132 to improve the adhesive effect of the adhesives, so that the Frit glue 14, the first high temperature resistant adhesive 131, the second high temperature resistant adhesive 132, and the TFT backplane 1 can be more closely attached, and at the same time, the ability of the adhesives to block water and oxygen is improved.
Referring to fig. 2 and 4, in the present embodiment, before the step of coating the first high temperature resistant adhesive around the OLED device layer of the TFT backplane, the method further includes the steps of: a groove 11 is formed around the OLED device layer 2, and the first high temperature resistant adhesive 131 is coated in the groove 11. TFT backplate 1 digs a width for 2mm, highly be 4 um's slot 11 in the position that Frit glued 14, the channel is used for holding first high temperature resistant adhesive 131, the high temperature resistant adhesive 132 of second, and the width is the same with first high temperature resistant adhesive 131, first high temperature resistant adhesive 131 fill in the slot 11. Further, before the step of coating the first high temperature resistant adhesive, the method further comprises the steps of: the TFT back sheet is roughened at a position where the first high temperature resistant adhesive is to be coated, and a roughened portion 12 is formed at the position where the first high temperature resistant adhesive is coated. Specifically, the grooves 11 are roughened by a focused ion beam, thereby enhancing the adhesion between the first high temperature adhesive 131 and the TFT backplane 1.
In this embodiment, the Frit paste 14 is doped with carbon black, and the Frit paste 14 is a glass paste mainly composed of metal oxide and doped with an organic solvent to be a colloidal substance. In this application, mix the tiny carbon black in original Frit glue 14, this kind of tiny carbon black can reach very high blackness, and the absorption of black matter to light is the complete absorption, and he can not be with light reflection, especially the infrared ray that uses in the laser welding, the Frit glue 14 that mixes tiny carbon black, and its whole blackness has very big improvement, and such Frit glue 14 can absorb the energy of laser better, also can make Frit glue 14 be heated more evenly simultaneously.
Referring to fig. 1, the present embodiment further provides a display screen package structure, including: the OLED device comprises a cover plate, an OLED device layer and a TFT backboard; the OLED device layer is arranged on the TFT back plate, and the cover plate is covered on one side of the TFT back plate, which is provided with the OLED device; the OLED device comprises a cover plate and a TFT backboard, and is characterized in that a first high-temperature-resistant adhesive and a Frit adhesive are arranged on the periphery of an OLED device layer, the Frit adhesive is arranged on the first high-temperature-resistant adhesive, and the first high-temperature-resistant adhesive and the Frit adhesive are used for connecting the cover plate and the TFT backboard. It should be noted that the first high temperature resistant adhesive and the Frit adhesive are wound around the OLED device, and meanwhile, a first high temperature resistant adhesive 131 is further disposed between the Frit adhesive 14 and the TFT backplane 1; specifically, a circle of Frit glue 14 surrounds the OLED device layer 2, and a first high temperature resistant adhesive 131 is disposed below the Frit glue 14, in some embodiments, a circle of UV frame glue surrounds the Frit glue 14, and the UV frame glue may be disposed on the extension of the cover plate 3. In order to prevent the circuit board from being damaged by the heat absorbed by the Frit glue 14 during laser welding, a first high temperature resistant adhesive 131 is coated between the Frit glue 14 and the TFT backplane 1 for absorbing or blocking the heat generated during laser welding, so as to protect the TFT backplane 1 from being damaged. The cover plate is a CG cover plate. Above-mentioned technical scheme has improved the laminating condition of Frit glue 14 and TFT backplate 1, the material that first high temperature resistant adhesive 131 adopted not only has stronger adhesive force and to organism, TFT backplate 1 noncorrosive, can keep good bonding property under high temperature, long service life moreover. Meanwhile, the first high-temperature-resistant adhesive 131 is used for blocking heat generated by the Frit glue 14 during laser welding, so that metal wires on the TFT backboard 1 are protected from being damaged by high temperature, and the water and oxygen blocking capability of display screen packaging is enhanced, so that the service life of the OLED display screen is prolonged.
Referring to fig. 3, in some implementations, the method further includes: a second high temperature resistant adhesive; the second high-temperature-resistant adhesive is arranged on the middle part of the first high-temperature-resistant adhesive, and the cross section of the second high-temperature-resistant adhesive is an arc-shaped bulge. It should be noted that the second high temperature resistant adhesive 132 is matched with the saddle-shaped recess in the Frit glue, and when the cover plate and the base plate are attached to each other, the convex surface structure of the second high temperature resistant adhesive 132 is complementary to the concave surface structure of the Frit glue, so as to fill and level up the concave surface structure. Specifically, in actual operation, if the first high temperature resistant adhesive 131 is directly attached to the Frit rubber 14, a saddle-shaped cross section with a lower middle and two higher sides is formed on the cover plate by the Frit rubber 14 due to factors such as gravity and a coating method, so that air is generated in the middle of the first high temperature resistant adhesive 131 and the Frit rubber 14 after the cover plate 3 is covered, and after the packaging is completed, a gap is generated between the interfaces where the two contact with each other, so that water and oxygen invade, and finally, the service life of the display is reduced or the product is failed, therefore, in this embodiment, the first high temperature resistant adhesive 131 is coated with the second high temperature resistant adhesive 132, the cross section of the second high temperature resistant adhesive 132 is an arc-shaped protrusion, and the second high temperature resistant adhesive 132 is located at a position right at the middle recess of the Frit rubber 14. After the second high temperature resistant adhesive 132 is attached to the Frit glue, the second high temperature resistant adhesive 132 fills the saddle-shaped recessed area of the Frit glue, so that the original recessed area is flush with the two ends, and the recess in the middle of the saddle shape is eliminated, thereby preventing water and oxygen from invading, and finally causing the service life of the display to be reduced or the product to be invalid. Referring to fig. 1, in some implementations, a groove is formed in the TFT backplane around the OLED device layer, and the first high temperature adhesive, the second high temperature adhesive, and the Frit glue are disposed in the groove.
It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the scope of the present invention.
Claims (3)
1. A display screen packaging structure, comprising: the OLED device comprises a cover plate, an OLED device layer and a TFT backboard; the OLED device layer is arranged on the TFT back plate, and the cover plate is covered on one side of the TFT back plate, which is provided with the OLED device;
the OLED device comprises a cover plate and a TFT backboard, and is characterized in that a first high-temperature-resistant adhesive and a Frit adhesive are arranged on the periphery of an OLED device layer, the Frit adhesive is arranged on the first high-temperature-resistant adhesive, and the first high-temperature-resistant adhesive and the Frit adhesive are used for connecting the cover plate and the TFT backboard.
2. The display screen packaging structure of claim 1, further comprising: a second high temperature resistant adhesive; the second high-temperature-resistant adhesive is arranged on the middle part of the first high-temperature-resistant adhesive, and the cross section of the second high-temperature-resistant adhesive is an arc-shaped bulge.
3. The display screen packaging structure of claim 2, wherein the TFT backplane around the OLED device layer is provided with a groove, and the first high temperature adhesive, the second high temperature adhesive, and the Frit glue are disposed in the groove.
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| CN202021502354.3U CN212485362U (en) | 2020-07-27 | 2020-07-27 | Display screen packaging structure |
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| CN202021502354.3U CN212485362U (en) | 2020-07-27 | 2020-07-27 | Display screen packaging structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864114A (en) * | 2020-07-27 | 2020-10-30 | 福建华佳彩有限公司 | Display screen packaging structure and packaging method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864114A (en) * | 2020-07-27 | 2020-10-30 | 福建华佳彩有限公司 | Display screen packaging structure and packaging method |
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