CN108828813B - Manufacturing method of curved surface display device - Google Patents
Manufacturing method of curved surface display device Download PDFInfo
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- CN108828813B CN108828813B CN201810482528.5A CN201810482528A CN108828813B CN 108828813 B CN108828813 B CN 108828813B CN 201810482528 A CN201810482528 A CN 201810482528A CN 108828813 B CN108828813 B CN 108828813B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention discloses a method for manufacturing a curved surface display device, which comprises the following steps: s1, attaching frame areas of a first substrate and a second substrate which have unequal thermal expansion coefficients by using frame sealing glue; s2, heating the frame sealing glue, the first substrate and the second substrate to enable the frame sealing glue to be solidified to fixedly bond the first substrate and the second substrate together, and enable the first substrate and the second substrate to generate different size variation quantities. In the invention, the first substrate and the second substrate have different thermal expansion coefficients, a certain temperature variation is generated in the heating process, and the first substrate and the second substrate have different thermal expansion coefficients, so that different size variations are generated. And because the frame sealing glue fixedly bonds the first substrate and the second substrate together at the frame region, so that the different size variation of the first substrate and the second substrate can bend the whole display panel towards the substrate with the large size variation, thereby forming the curved surface display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a manufacturing method of a curved surface display device.
Background
In recent years, curved display devices have been developed more and more rapidly. Curved display devices can provide better viewing and can be made larger with the same width as flat display devices. The curved display device generally adopts flexible substrates such as plastic, metal sheet or glass sheet as a substrate, and the bending method generally increases external force to bend the curved display device in a heating state, but the yield of products formed in such a way is low.
In order to solve the above problem, CN103984155A discloses a method for manufacturing a curved surface display device, comprising: bonding frame areas of the first substrate and the second substrate with unequal thermal expansion coefficients by using frame sealing glue to obtain a first substrate and a second substrate which are boxed; heating the first substrate and the second substrate after box alignment from a first preset temperature value before curing of the frame sealing glue to a second preset temperature value after curing of the frame sealing glue; and cooling the heated first substrate and the second substrate. Therefore, the frame sealing glue is colloidal before curing, the first substrate and the second substrate expand when heated and deform without being bound by the frame sealing glue, and the first substrate and the second substrate are in powerless interaction; the first substrate and the second substrate are cooled after the frame sealing glue is solidified, the frame area of the first substrate and the frame area of the second substrate are fixedly connected, the first substrate and the second substrate shrink after being cooled, and the first substrate and the second substrate have powerful interaction and can naturally generate irreversible deformation in the process of shrinking at different shrinkage rates due to the fixed connection of the frame area of the first substrate and the frame area of the second substrate, so that the curved surface display device is formed. According to the invention, after the frame sealing glue is solidified, the first base plate and the second base plate are bent in the deformation process due to cooling shrinkage and fixed connection between the first base plate and the second base plate, and a fixing device, such as an iron frame, is not required to be arranged on the outer surfaces of the first base plate and the second base plate to fix the first base plate and the second base plate to keep the first base plate and the second base plate in a bent state. The curved surface display device formed through the process is simple in structure and high in yield. However, the inventor finds in practice that if the frame sealing adhesive is cooled and deformed after being completely cured, the shape of the frame sealing adhesive limits the deformation of the substrate to a certain extent, and the probability of the curvature is very low. In addition, if the thermal expansion coefficient of the substrate is not matched with the cooling coefficient of the frame sealing adhesive, the frame sealing adhesive may be unsealed and leaked.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a manufacturing method of a curved surface display device.
The technical problem to be solved by the invention is realized by the following technical scheme:
a method for manufacturing a curved surface display device comprises the following steps:
s1, attaching frame areas of a first substrate and a second substrate which have unequal thermal expansion coefficients by using frame sealing glue to obtain a first substrate and a second substrate which are paired;
s2, heating the frame sealing glue, the first substrate and the second substrate to enable the frame sealing glue to be solidified to fixedly bond the first substrate and the second substrate together, and enabling the first substrate and the second substrate to generate different size variation quantities to form the curved surface display device.
Further, the frame sealing glue is a thermosetting frame sealing glue.
Further, the first substrate is soda-lime glass and the second substrate is alkali-free glass.
Further, the heating employs a three-stage temperature programming.
Further, the conditions of the three-stage temperature programming are as follows:
the first stage is as follows: heating to 80-100 deg.C from room temperature, maintaining the temperature for 5-10min, and maintaining the air pressure at 0.03-0.05 MPa;
and a second stage: keeping the temperature at 80-100 deg.C for 30-40min, and increasing the air pressure to 0.05-0.08 MPa;
and a third stage: heating to 160 ℃ and 180 ℃, and keeping the temperature for 50-70min, wherein the air pressure is kept at 0.05-0.08 MPa.
Further, the conditions of the three-stage temperature programming are as follows:
the first stage is as follows: heating to 90 deg.C from room temperature, maintaining the temperature for 8min, and maintaining the air pressure at 0.04 MPa;
and a second stage: keeping the temperature at 90 ℃ for 32min, and increasing the air pressure to 0.07 MPa;
and a third stage: heating to 170 deg.C, maintaining the temperature for 60min, and maintaining the air pressure at 0.07 MPa.
Further, the display device is an organic light emitting display OLED or a liquid crystal display LCD.
The invention has the following beneficial effects:
in the invention, the first substrate and the second substrate have different thermal expansion coefficients, a certain temperature variation is generated in the heating process, and the first substrate and the second substrate have different thermal expansion coefficients, so that different size variations are generated. And because the frame sealing glue fixedly bonds the first substrate and the second substrate together at the frame region, so that the different size variation of the first substrate and the second substrate can bend the whole display panel towards the substrate with the large size variation, thereby forming the curved surface display device.
The invention utilizes the difference of thermal expansion coefficients to finish the bending of the display device in a heating state. The method does not need to add a process and an external force, and is simple and easy to implement.
Detailed Description
A method for manufacturing a curved surface display device comprises the following steps:
s1, attaching frame areas of a first substrate and a second substrate which have unequal thermal expansion coefficients by using frame sealing glue to obtain a first substrate and a second substrate which are paired;
s2, heating the frame sealing glue, the first substrate and the second substrate to enable the frame sealing glue to be solidified to fixedly bond the first substrate and the second substrate together, and enabling the first substrate and the second substrate to generate different size variation quantities to form the curved surface display device.
In the invention, a certain temperature variation is generated in the process of heating the frame sealing glue, the first substrate and the second substrate, the thermal expansion coefficients of the first substrate and the second substrate are different, so that different size variations are generated, and the frame sealing glue fixedly bonds the first substrate and the second substrate together in the frame area, so that the whole display panel can be bent towards the substrate with the large size variation due to the different size variations of the first substrate and the second substrate. In the invention, the deformation of the substrate and the solidification of the frame sealing glue are simultaneously carried out, and the shrinkage deformation of the first substrate and the second substrate after cooling is not depended on after the solidification of the frame sealing glue. According to the invention, the substrate deforms along with heating, the frame sealing glue is gradually cured along with the deformation of the substrate from the initial jelly with any shape along with the temperature rise, and finally, when the final frame sealing glue curing temperature is reached, the frame sealing glue is completely cured, the shape of the frame sealing glue is changed along with the deformation of the substrate, and the frame sealing glue cannot be changed along with the room temperature recovery process, so that the substrate and the frame sealing glue have the force effect, and the mutual balance is realized to achieve the effect of a final curved surface. Thus, on one hand, the curvature of the formed curved surface can be controlled along with the control of the heating temperature, and the product possibility is higher. On the other hand, the deformation of the substrate and the curing of the frame sealing glue are carried out simultaneously, the matching relation between the frame sealing glue and the substrate does not need to be considered, and the frame sealing glue and the substrate complement each other. The frame sealing glue can well solve the possible deblocking problem of the frame sealing glue and the control problem of the substrate curved surface shape.
In the present invention, the material of the first substrate and the second substrate is not particularly limited, as long as the material of the first substrate and the material of the second substrate are different, so that the thermal expansion coefficients of the first substrate and the second substrate are different. For example, the first substrate and the second substrate may be glass substrates or plastic substrates. Examples of the glass substrate include, but are not limited to, alkali-free glass, soda-lime glass, tempered glass, aluminosilicate glass, and borosilicate glass. For the plastic substrate, there may be exemplified, but not limited to, polyimide, polyether sulfone, polyetherimide, polyarylate, polycarbonate, polyethylene naphthalate or polyvinyl ether phthalate. More preferably, the first substrate is soda lime glass and the second substrate is alkali-free glass.
Specifically, the Coefficient of Thermal Expansion (CTE) of the first substrate and the second substrate refers to a Coefficient of regularity that geometric characteristics of a substance change with temperature change under the effect of expansion and contraction with heat.
In the invention, the frame sealing glue is preferably a thermosetting frame sealing glue.
In the present invention, the heating is preferably performed by three-stage temperature programming. In the invention, the heating is carried out by stages, which is more beneficial to the expansion and bending of the substrate and avoids the problems of cracking and the like caused by the too fast expansion of the substrate due to the too fast temperature rise. In the present invention, the temperature and the gas pressure of each stage are controlled in the step-by-step temperature increase process. Therefore, the shape of the curved surface is better controlled, the adhesion force of the frame sealing glue and the substrate is enhanced, and the problem of frame sealing glue bubbles possibly generated in the operation process is reduced. If the air pressure is properly increased during heating, bubbles generated in the colloid can be greatly reduced, and the adhesion strength of the substrate and the frame sealing glue is enhanced. On the other hand, the pressing may actively control the substrate deformation to achieve the desired curvature.
In the present invention, the temperature, time and pressure at each stage are adjusted according to the thermal expansion coefficient of the substrate and the curvature to be achieved. Preferably, the conditions of the three-stage temperature programming are as follows: the first stage is as follows: heating to 80-100 deg.C from room temperature, maintaining the temperature for 5-10min, and maintaining the air pressure at 0.03-0.05 MPa; and a second stage: keeping the temperature at 80-100 deg.C for 30-40min, and increasing the air pressure to 0.05-0.08 MPa; and a third stage: heating to 160 ℃ and 180 ℃, and keeping the temperature for 50-70min, wherein the air pressure is kept at 0.05-0.08 MPa. More preferably, the conditions of the three-stage temperature programming are as follows: the first stage is as follows: heating to 90 deg.C from room temperature, maintaining the temperature for 8min, and maintaining the air pressure at 0.04 MPa; and a second stage: keeping the temperature at 90 ℃ for 32min, and increasing the air pressure to 0.07 MPa; and a third stage: heating to 170 deg.C, maintaining the temperature for 60min, and maintaining the air pressure at 0.07 MPa.
In the present invention, the type of the display device is not particularly limited, and the display device may be an organic light emitting display OLED or a liquid crystal display LCD.
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Example 1
A method for manufacturing a curved surface display device comprises the following steps:
step 1: providing a first substrate, and forming a color filter film on the first substrate to obtain a CF substrate; providing a second substrate, and manufacturing a TFT substrate by using the second substrate; the thermal expansion coefficients of the first substrate and the second substrate are different, the first substrate is soda-lime glass, and the second substrate is alkali-free glass;
step 2: coating frame sealing glue on the TFT substrate by a silk-screen or picture frame process, and then attaching the TFT substrate and the CF substrate;
and step 3: heating the frame sealing glue, the first substrate and the second substrate to solidify the frame sealing glue, fixedly bonding the first substrate and the second substrate together, and simultaneously enabling the first substrate and the second substrate to generate different size variation quantities; the heating adopts three-stage temperature programming, and the conditions of the three-stage temperature programming are as follows: the first stage is as follows: heating to 90 deg.C from room temperature, maintaining the temperature for 8min, and maintaining the air pressure at 0.04 MPa; and a second stage: keeping the temperature at 90 ℃ for 32min, and increasing the air pressure to 0.07 MPa; and a third stage: heating to 170 deg.C, maintaining the temperature for 60min, and maintaining the air pressure at 0.07 MPa.
And 4, step 4: and sealing after vacuum liquid filling to form the curved surface display device.
Example 2
A method for manufacturing a curved surface display device comprises the following steps:
step 1: providing a first substrate, and forming a color filter film on the first substrate to obtain a CF substrate; providing a second substrate, and manufacturing a TFT substrate by using the second substrate; wherein the first substrate and the second substrate have different thermal expansion coefficients, the first substrate is soda-lime glass, and the second substrate is aluminosilicate glass;
step 2: providing a liquid crystal material, dripping the liquid crystal material on the CF substrate or the TFT substrate, coating frame sealing glue on the periphery of the CF substrate or the TFT substrate, and then attaching the TFT substrate and the CF substrate;
and step 3: heating the frame sealing glue, the first substrate and the second substrate to solidify the frame sealing glue, fixedly bonding the first substrate and the second substrate together, and simultaneously enabling the first substrate and the second substrate to generate different size variation quantities; the heating adopts three-stage temperature programming, and the conditions of the three-stage temperature programming are as follows: the first stage is as follows: heating to 80 deg.C from room temperature, maintaining the temperature for 10min, and maintaining the air pressure at 0.03 MPa; and a second stage: keeping the temperature at 80 ℃ for 30min, and increasing the air pressure to 0.08 MPa; and a third stage: heating to 160 deg.C, maintaining the temperature for 70min, and maintaining the air pressure at 0.08 MPa.
The above-mentioned embodiments only express the embodiments of the present invention, and the description is more specific and detailed, but not understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by using the equivalent substitution or the equivalent transformation should fall within the protection scope of the present invention.
Claims (6)
1. A method for manufacturing a curved surface display device comprises the following steps:
s1, attaching frame areas of a first substrate and a second substrate which have unequal thermal expansion coefficients by using frame sealing glue to obtain a first substrate and a second substrate which are paired;
s2, heating the frame sealing glue, the first substrate and the second substrate to enable the frame sealing glue to be solidified so as to fixedly bond the first substrate and the second substrate together, and enabling the first substrate and the second substrate to generate different size variation quantities to form the curved surface display device;
in the heating process, the deformation of the substrate and the curing of the frame sealing glue are carried out simultaneously, the substrate is deformed and slowly cured along with the heating temperature rise, and the frame sealing glue is gradually cured along with the deformation of the substrate from the initial jelly with any shape.
2. The method of claim 1, wherein the sealant is a thermosetting sealant.
3. The method of claim 1, wherein the heating is performed by a three-stage temperature programming.
4. The method for manufacturing a curved display device according to claim 3, wherein the three-stage temperature programming conditions are as follows:
the first stage is as follows: heating to 80-100 deg.C from room temperature, maintaining the temperature for 5-10min, and maintaining the air pressure at 0.03-0.05 MPa;
and a second stage: keeping the temperature at 80-100 deg.C for 30-40min, and increasing the air pressure to 0.05-0.08 MPa;
and a third stage: heating to 160 ℃ and 180 ℃, and keeping the temperature for 50-70min, wherein the air pressure is kept at 0.05-0.08 MPa.
5. The method for manufacturing a curved display device according to claim 3, wherein the three-stage temperature programming conditions are as follows:
the first stage is as follows: heating to 90 deg.C from room temperature, maintaining the temperature for 8min, and maintaining the air pressure at 0.04 MPa;
and a second stage: keeping the temperature at 90 ℃ for 32min, and increasing the air pressure to 0.07 MPa;
and a third stage: heating to 170 deg.C, maintaining the temperature for 60min, and maintaining the air pressure at 0.07 MPa.
6. The method for manufacturing a curved display device according to claim 1, wherein the display device is an Organic Light Emitting Display (OLED) or a Liquid Crystal Display (LCD).
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07301789A (en) * | 1994-05-06 | 1995-11-14 | Casio Comput Co Ltd | Liquid crystal display device and its production |
| CN102707474A (en) * | 2012-05-11 | 2012-10-03 | 京东方科技集团股份有限公司 | Bending liquid crystal display screen and manufacturing method and manufacturing device of bending liquid crystal display |
| CN103984155A (en) * | 2014-04-30 | 2014-08-13 | 京东方科技集团股份有限公司 | Curved-surface displaying device and manufacturing method thereof |
| CN106058074A (en) * | 2016-07-29 | 2016-10-26 | 京东方科技集团股份有限公司 | Packaging piece, packaging method, solidifying device, packaging system, and display device |
| CN206385033U (en) * | 2015-07-10 | 2017-08-08 | 康宁股份有限公司 | Laminated product and the vehicles comprising it |
-
2018
- 2018-05-18 CN CN201810482528.5A patent/CN108828813B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07301789A (en) * | 1994-05-06 | 1995-11-14 | Casio Comput Co Ltd | Liquid crystal display device and its production |
| CN102707474A (en) * | 2012-05-11 | 2012-10-03 | 京东方科技集团股份有限公司 | Bending liquid crystal display screen and manufacturing method and manufacturing device of bending liquid crystal display |
| CN103984155A (en) * | 2014-04-30 | 2014-08-13 | 京东方科技集团股份有限公司 | Curved-surface displaying device and manufacturing method thereof |
| CN206385033U (en) * | 2015-07-10 | 2017-08-08 | 康宁股份有限公司 | Laminated product and the vehicles comprising it |
| CN106058074A (en) * | 2016-07-29 | 2016-10-26 | 京东方科技集团股份有限公司 | Packaging piece, packaging method, solidifying device, packaging system, and display device |
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| CN108828813A (en) | 2018-11-16 |
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