CN111883474A - Display device and preparation method of flexible display panel - Google Patents
Display device and preparation method of flexible display panel Download PDFInfo
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- CN111883474A CN111883474A CN202010760294.3A CN202010760294A CN111883474A CN 111883474 A CN111883474 A CN 111883474A CN 202010760294 A CN202010760294 A CN 202010760294A CN 111883474 A CN111883474 A CN 111883474A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/80—Manufacture or treatment specially adapted for the organic devices covered by this subclass using temporary substrates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68381—Details of chemical or physical process used for separating the auxiliary support from a device or wafer
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
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Abstract
The invention provides a display device and a preparation method of a flexible display panel. According to the preparation method of the flexible display panel, the support film and the protective film are bonded together through the first ultraviolet ray anti-adhesion layer in the protective film, and the first ultraviolet ray anti-adhesion layer can stably and reliably bond the support film and the protective film together, so that the problem that the support film and the protective film are cracked in the profiling bending process is avoided, the optical cement is prevented from being scratched due to interference of the optical cement and cover glass, the cover glass and the optical cement are tightly bonded, the bonding qualification rate of the cover glass is improved, and the reject ratio of the flexible display panel is reduced. After the ultraviolet rays are irradiated from the side, far away from the first ultraviolet ray anti-adhesion layer, of the protective film, the viscosity of the first ultraviolet ray anti-adhesion layer is reduced, and the protective film can be simply and easily removed without influencing the supporting film.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device and a preparation method of a flexible display panel.
Background
Along with the development of market demand and technique, 3D glass apron appearance is more novel pleasing to the eye, the display effect is good, and replaces original 2D and 2.5D glass apron gradually. When the glass cover plate is attached to the display module, the display module is required to be bent into the shape of the glass cover plate by adopting bending equipment in a profiling mode, and then the glass cover plate is attached.
For the flexible display panel, the back of the flexible display module is required to be provided with a support film to reinforce and support the flexible display module, and a protection film is attached to the back of the support film to further protect circuits, chips and the like in the flexible display module.
However, in the prior art, when the display module is bent in a profiling mode, the edge bonding between the support film and the protective film is not firm, and the Peeling (Peeling) problem is easy to occur.
Disclosure of Invention
In view of the above defects, embodiments of the present invention provide a display device and a method for manufacturing a flexible display panel, which are used to prevent an edge of a support film from being bonded to an edge of a protection film insecurely and peeling off when a profiling bending display module is bent, improve the bonding firmness between the support film and the protection film, and improve the yield of glass cover plate bonding.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for manufacturing a flexible display panel, including:
providing a protective film, wherein the protective film comprises a first ultraviolet ray anti-adhesion layer;
the protective film is bonded with a supporting film through the first ultraviolet ray anti-adhesion layer;
sequentially bonding a display module and cover plate glass on one side of the support film far away from the first ultraviolet ray anti-adhesion layer through optical cement;
irradiating the side, far away from the first ultraviolet ray anti-adhesion layer, of the protective film by using ultraviolet rays to reduce the viscosity of the first ultraviolet ray anti-adhesion layer;
and tearing off the protective film.
According to the preparation method, the support film and the protective film are bonded together through the first ultraviolet ray anti-adhesion layer in the protective film, the first ultraviolet ray anti-adhesion layer has the first initial viscosity with higher viscosity, and the problem that the support film and the protective film are peeled off in the profiling bending process is avoided; after irradiation with ultraviolet rays, the viscosity of the first ultraviolet ray anti-adhesive layer is reduced, and the protective film can be easily removed without affecting the support film.
As an improvement of the above method for manufacturing a flexible display panel, before the step of bonding a support film to the first ultraviolet ray anti-sticking layer, the method further includes:
forming a second ultraviolet ray anti-adhesion layer on the first ultraviolet ray anti-adhesion layer, and adhering the support film on the second ultraviolet ray anti-adhesion layer;
after the step of bonding a display module assembly and a cover plate glass in proper order through the optical cement in the one side of keeping away from first ultraviolet ray viscidity layer at the supporting film, still include: and irradiating the side, far away from the first ultraviolet ray anti-adhesion layer, of the protective film by using the ultraviolet rays to reduce the viscosity of the first ultraviolet ray anti-adhesion layer and the second ultraviolet ray anti-adhesion layer.
According to the preparation method, the second first ultraviolet ray anti-adhesion layer is formed between the first ultraviolet ray anti-adhesion layer and the support film, so that the bonding reliability of the protection film and the support film is further improved, and the problem that the support film and the protection film are peeled off in the profiling bending process is avoided.
As an improvement of the above-mentioned method for manufacturing a flexible display panel of the present invention, the method further includes: further comprising:
providing a guide film;
and adhering the guide film to one side of the protective film, which is far away from the first ultraviolet ray anti-adhesion layer.
Through the guide membrane that bonds in the one side that first ultraviolet ray visbreaking layer was kept away from to the protective film, through the guide membrane of bending, guide protective film, support membrane and display module assembly are buckled, avoid bending equipment damage display module assembly.
As an improvement of the above-mentioned method for manufacturing a flexible display panel, the guide film is bonded to the side of the protective film away from the first ultraviolet ray anti-adhesive layer through a third ultraviolet ray anti-adhesive layer.
The guide film is adhered to the protective film through a third ultraviolet ray anti-adhesion layer, and the third ultraviolet ray anti-adhesion layer has a third initial viscosity with higher viscosity, so that the guide film and the protective film are prevented from being peeled off in the bending process; after the irradiation with ultraviolet rays, the viscosity of the third ultraviolet ray anti-adhesive layer is lowered, and the guide film can be easily removed without affecting the protective film.
As an improvement of the above-mentioned method for manufacturing a flexible display panel, after the step of bonding a display module by optical cement and before the step of bonding a cover glass by optical cement, the method further includes: and clamping the guide film by using a film clamping structure of a bending device, and bending the guide film so as to lead the guide film to guide the protective film, the support film and the display module to be bent.
The clamping structure of the bending equipment is utilized to clamp and guide the film to be bent, so that the guide film guides the protective film, the support film and the display module to be bent, and the display module is prevented from being damaged by clamping of the bending equipment.
As an improvement of the above-mentioned method for manufacturing a flexible display panel of the present invention, the method further includes irradiating with ultraviolet rays from a side of the guide film away from the protective film to reduce the viscosity of the third ultraviolet ray anti-adhesive layer, and the viscosity of the third ultraviolet ray anti-adhesive layer after the ultraviolet ray irradiation is lower than the viscosity of the first ultraviolet ray anti-adhesive layer or the second ultraviolet ray anti-adhesive layer after the ultraviolet ray irradiation;
and tearing off the guide film.
In the preparation method, the guide film is arranged on one side, away from the first ultraviolet ray anti-adhesion layer, of the protective film, and the protective film, the support film and the display module are guided to be bent through bending the guide film, so that the display module is prevented from being damaged by bending equipment. The guide film is adhered to the protective film through a third ultraviolet ray anti-adhesion layer, and the third ultraviolet ray anti-adhesion layer has a third initial viscosity with higher viscosity, so that the guide film and the protective film are prevented from being peeled off in the bending process; after the irradiation with ultraviolet rays, the viscosity of the third ultraviolet ray anti-adhesive layer is lowered, and the guide film can be easily removed without affecting the protective film.
As an improvement of the preparation method of the flexible display panel, the initial viscosity of the third ultraviolet ray anti-adhesion layer is 2000-2500 gf/25mm, the initial viscosity is high, the guide film and the protective film are ensured to be adhered reliably and firmly, and the bending effect is prevented from being influenced by the separation of the guide film and the protective film in the profiling bending process. The viscosity of the third ultraviolet ray anti-adhesion layer after ultraviolet irradiation is 5-10 gf/25mm, and after the ultraviolet ray irradiation is adopted, the viscosity of the third ultraviolet ray anti-adhesion layer is reduced, so that the guide film is conveniently removed, and the protective film is not influenced.
As an improvement of the preparation method of the flexible display panel, the initial viscosity of the first ultraviolet ray anti-adhesion layer and the initial viscosity of the second ultraviolet ray anti-adhesion layer are 2000-2500 gf/25mm, the initial viscosities are high, the bonding between the protective film and the support film is ensured to be reliable and firm, and the problem that the support film and the protective film are peeled off in the profiling bending process is avoided; the viscosity of the first ultraviolet ray anti-adhesion layer and the viscosity of the second ultraviolet ray anti-adhesion layer after ultraviolet irradiation are 15-25 gf/25mm, and after the ultraviolet ray irradiation, the viscosity of the first ultraviolet ray anti-adhesion layer and the viscosity of the second ultraviolet ray anti-adhesion layer are reduced, so that the protective film can be easily removed without affecting the support film.
As an improvement of the above-mentioned method for manufacturing a flexible display panel according to the present invention, the first and second ultraviolet ray anti-adhesive layers are configured such that the viscosity thereof decreases to 15 to 25gf/25mm at 1000mj to 2000mj of accumulated ultraviolet ray irradiation energy when irradiated with the ultraviolet rays from a side of the guide film away from the protective film; and the third UV-ray anti-adhesive layer is configured to have a viscosity reduced to 5 to 10gf/25mm when the cumulative UV irradiation energy is 1000mj to 2000 mj.
In the preparation method of this embodiment, the viscosity of the first ultraviolet ray anti-adhesive layer, the viscosity of the second ultraviolet ray anti-adhesive layer, and the viscosity of the third ultraviolet ray anti-adhesive layer can be reduced to the preset range by one ultraviolet ray irradiation, and the viscosity of the irradiated third ultraviolet ray anti-adhesive layer is smaller than the viscosity of the irradiated first ultraviolet ray anti-adhesive layer or the irradiated second ultraviolet ray anti-adhesive layer, so that the protective film is not removed together when the guide film is removed first, that is, the guide film is removed first and then the protective film is removed according to the order.
As an improvement of the preparation method of the flexible display panel, the wavelength of the ultraviolet light is 365 nm-385 nm, and the ultraviolet light in the wavelength range is adopted, so that the irradiation efficiency of the first ultraviolet ray anti-adhesion layer and the second ultraviolet ray anti-adhesion layer is favorably improved.
In a second aspect, an embodiment of the present invention provides a display device, which includes a housing and a flexible display panel obtained by the method for manufacturing a flexible display panel according to the first aspect, wherein the flexible display panel is installed in the housing.
The display device provided by the second aspect of the embodiment of the invention is prepared by the preparation method of the first aspect, which is beneficial to improving the qualification rate of the flexible display panel and reducing the reject ratio of cover plate glass attachment; the processing technology of the flexible display panel is simplified, the processing efficiency of the flexible display panel is improved, and the processing cost of the flexible display panel is reduced.
Compared with the prior art, the preparation method of the flexible display panel provided by the first aspect of the embodiment of the invention has the following advantages:
according to the preparation method of the flexible display panel, provided by the embodiment of the invention, the support film and the protective film are bonded together through the first ultraviolet ray anti-adhesion layer in the protective film, and the first ultraviolet ray anti-adhesion layer has the first initial viscosity which can stably and reliably bond the support film and the protective film together, so that the problem that the support film and the protective film are peeled off in the profiling bending process is avoided, further the optical cement on the display module is prevented from being warped and scratched due to interference of cover glass, the cover glass is tightly bonded with the second optical cement, the bonding qualification rate of the cover glass is improved, and the reject ratio of the flexible display panel is reduced. After the protective film is subjected to ultraviolet irradiation treatment, the first ultraviolet ray visbreaking layer has a first irradiation viscosity with a lower viscosity, so that the protective film can be simply and easily removed without affecting the support film.
In addition to the technical problems solved by the present invention, the technical features constituting the technical solutions, and the advantageous effects brought by the technical features of the technical solutions described above, other technical problems that can be solved by the flexible display panel, the display device, and the method for manufacturing the flexible display panel according to the present invention, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be further described in detail in the detailed description.
Drawings
FIG. 1 is a schematic view of a prior art display module during bending;
fig. 2 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention;
fig. 3a to 3g are schematic diagrams illustrating a process for manufacturing a flexible display panel according to an embodiment of the present invention;
fig. 4a to 4g are schematic diagrams illustrating a manufacturing process of a flexible display panel according to a second embodiment of the present invention;
fig. 5a to 5h are schematic diagrams illustrating a manufacturing process of a flexible display panel according to a third embodiment of the present invention.
Description of reference numerals:
10: a protective film; 11: a first ultraviolet ray anti-adhesive layer; 20: a first glue layer; 30: a support film; 40: a second adhesive layer; 50: a display module; 60: a third adhesive layer; 70: cover plate glass;
21: a second ultraviolet ray anti-adhesive layer; 41: a first optical cement; 61: a second optical cement;
80: a guide film; 81: a third ultraviolet ray anti-adhesive layer.
Detailed Description
Referring to fig. 1, flexible display module assembly among the prior art is in the course of working, provide protection film 10 earlier, then will support membrane 30 through first glue film 20 and bond in one side of protection film 10, rethread second glue film 40 bonds display module assembly 50 in the one side of keeping away from first glue film 20 of supporting membrane 30, play the protection through protection film 10 and support membrane 30 to display module assembly 50, the effect of reinforcement and support, avoid display module assembly 50 to receive external collision and damage, and then avoid flexible display panel the unusual condition of function to appear.
Then, the third adhesive layer 60 is disposed on the upper surface of the display module 50, and the protective film 10, the first adhesive layer 20, the support film 30, the second adhesive layer 40, the display module 50, and the third adhesive layer 60 are bent in a profiling manner. Then, the cover glass 70 is attached to the upper side of the profiling die set after the profiling bending.
Finally, the protective film 10 which protects the side of the support film 30 close to the first adhesive layer 20 is torn off.
Since the protective film 10 needs to be peeled off, the viscosity of the first adhesive layer 20 for bonding the protective film 10 and the support film 30 needs to be configured to be low, so as to facilitate the peeling off of the protective film 10. In the profiling bending process, the supporting film 30 and the protective film 10 are bent at the same time, but because the viscosity of the first adhesive layer 20 is low, the edge of the supporting film 30 and the edge of the protective film 10 are easy to peel off (Peeling), the supporting film 30 losing the bending action force, the display module 50 and the optical cement on the upper surface of the display module 50 bounce and tilt, when the cover glass 70 is bonded, the long edge of the cover glass 70 interferes with the third adhesive layer 60 to scratch, so that the third adhesive layer 60 is bonded with the cover glass 70 badly, and the bonding effect of the cover glass 70 is finally influenced.
In view of the above, the present disclosure adopts a method of configuring an adhesive layer for adhering a protective film and a support film to have a variable viscosity, and, in consideration of process adaptability, using ultraviolet light to promote a decrease in viscosity of the adhesive layer, so that the protective film and the support film have a high bonding strength when bent in a profiling manner, and the bonding strength of the protective film and the support film is decreased to such an extent that the protective film can be easily torn off from the support film when subjected to ultraviolet light, especially when the ultraviolet light reaches a predetermined strength range. Therefore, the problem of Peeling (Peeling) of the protective film and the supporting film in the profiling bending process is avoided, and the attaching effect of the cover plate glass is improved.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 2, the flexible display panel according to the embodiment of the present invention includes a support film 30, a display module 50 and a cover glass 70, wherein the support film 30 is adhered to the display module 50 through a first optical adhesive 41, and the display module 50 is adhered to the cover glass 70 through a second optical adhesive 61. The cover glass 70 has a generally rectangular structure, and two long sides thereof are bent to form bent edges. The display module 50 of the present invention is a flexible display module, the edge of which can be bent to fit the cover glass 70. The flexible display panel of the embodiment of the invention can be an OLED display panel, and can be used in various display devices such as mobile phones, displays, televisions and the like.
The flexible display panel can be prepared by the following method:
referring to fig. 3a to 3g, wherein fig. 3a to 3g are schematic diagrams of a process for manufacturing a flexible display panel according to a first embodiment of the present invention, and a process for manufacturing the flexible display panel according to the first embodiment of the present invention is described in detail.
Alternatively, the first initial viscosity of the first ultraviolet ray anti-adhesive layer 11 may be in a range of 2000 to 2500gf/25mm to provide a suitable bonding strength of the protective film 10 and the support film 30; the first irradiation viscosity range of the first ultraviolet ray anti-adhesive layer 11 may be 15 to 25gf/25mm, so that the removal of the protection film 10 is easy and convenient without causing damage to the support film 30. The wavelength range of the ultraviolet rays to be treated by ultraviolet irradiation may be 365nm to 385 nm.
It is also noted that the protective film 10 may also be provided by an ultraviolet ray anti-adhesive film having the first ultraviolet ray anti-adhesive layer 11 at the time of production. Specifically, the ultraviolet ray anti-adhesive film comprises a protective film 10, a first ultraviolet ray anti-adhesive layer 11 positioned on one side of the protective film 10, and a removable release film positioned on one side of the first ultraviolet ray anti-adhesive layer 11 far away from the protective film 10, so that the release film only needs to be removed from the surface of the first ultraviolet ray anti-adhesive layer 11 when the support film 30 is adhered, and the preparation efficiency is improved.
In addition, the first ultraviolet ray anti-adhesive layer 11 may be torn off from the side of the support film 30 close to the first ultraviolet ray anti-adhesive layer 11 together with the protective film 10, which will be described in detail below.
The first ultraviolet ray anti-adhesive layer 11 has a first initial viscosity before being irradiated by ultraviolet rays, and the first initial viscosity is enough to ensure that the supporting film 30 and the protective film 10 are not peeled off in the profiling bending process of the subsequent process. After the ultraviolet irradiation treatment, the viscosity of the first ultraviolet ray anti-adhesive layer 11 is reduced from the first initial viscosity to the first irradiation viscosity, and the viscosity is reduced, so that when the protective film 10 is removed at the first irradiation viscosity with weaker viscosity, the supporting film 30 is not damaged by tearing.
In step 20, the protection film 10 is bonded to a support film 30 through the first uv-vis-a-vis layer 11. The support film 30 is used to support the display module 50, and the support film 30 may be a polyimide, polystyrene, polyethylene terephthalate (PET) film, or the like. The support membrane 30 is a flexible membrane that can be bent during the profiling bending process.
And step 30, sequentially bonding a display module 50 and cover glass 70 on one side of the support film 30 far away from the first ultraviolet ray anti-adhesion layer 11 through optical cement.
Specifically, a display module 50 is bonded to the side of the support film 30 away from the first uv anti-adhesive layer 11 through the first optical adhesive 41. The display module is manufactured by the existing manufacturing method, for example, an optional manufacturing method is as follows: an ITO anode, an organic light emitting layer, a metal cathode, a driving circuit, and the like are formed on the upper surface of the flexible substrate, thereby forming a display module 50 that can emit light. The present invention does not limit the specific film layer and processing technology of the display module 50.
Referring to fig. 3b, a first optical adhesive 41 is disposed on the upper surface of the support film 30, and the first optical adhesive 41 has a predetermined viscosity, and the predetermined viscosity is greater than the first irradiation viscosity of the first ultraviolet anti-adhesive layer 11, so that the support film 30 is not torn off from the side of the display module 50 close to the first optical adhesive 41 when the protection film 10 is removed. First optical adhesive 41 may be formed by a coating-curing method, an ink-jet printing method, or a casting method.
The first optical glue 41 may be an existing optical glue or an enhanced ultraviolet glue. When the first optical glue 41 is a reinforced ultraviolet glue, the viscosity of the first optical glue 41 can be changed by an ultraviolet irradiation treatment, for example, if the viscosity of the first optical glue 41 is currently weaker, the viscosity of the first optical glue 41 is increased by the ultraviolet irradiation treatment. Moreover, when the first optical adhesive 41 is an enhanced ultraviolet adhesive, the viscosity of the first ultraviolet anti-adhesive layer 11 is weakened by the ultraviolet irradiation treatment, and the viscosity of the first optical adhesive 41 is enhanced, so that the reliability of the adhesion between the support film 30 and the display module 50 is increased.
It should be noted that, in practical applications, a release film may be bonded to a side of the first optical adhesive 41 away from the support film 30, so that after the release film is torn off, the display module 50 may be directly bonded to the first optical adhesive 41, thereby improving the manufacturing efficiency.
Referring to fig. 3c, the lower surface of the display module 50, i.e., the side of the display module 50 close to the support film 30, is bonded to the first optical adhesive 41, so that the support film 30 provides support and protection for the display module 50.
Referring to fig. 3d, a second optical adhesive 61 is disposed on the upper surface of the display module 50, i.e., the display surface of the display module 50. The second optical cement 61 may be an existing OCA cement for bonding the cover glass 70. The structure shown in the figure is a display module to be profiled, that is, the display module to be profiled includes a protective film 10, a first ultraviolet ray anti-adhesive layer 11, a support film 30, a first optical adhesive 41, a display module 50, and a second optical adhesive 61.
Referring to fig. 3e, the display module to be profiled is bent to form a profiled display module. Because the first ultraviolet ray anti-adhesion layer 11 has a strong first initial viscosity, the initial viscosity of the first ultraviolet ray anti-adhesion layer 11 can be 2000-2500 gf/25mm, so that the protective film 10 and the support film 30 are firmly bonded, the problem of Peeling (Peeling) of the protective film 10 and the support film 30 in the profiling bending process is avoided, further OCA (optical clear adhesive) scraping can be avoided, and the qualification rate of the flexible display panel is improved.
Referring to fig. 3f, a cover glass 70 is attached to the second optical paste 61. The cover glass 70 may have a rectangular shape with bent edges formed at both long sides thereof. It should be noted that, in the drawings of the present invention, only the bent structure of one side of the cover glass 70 is shown.
Because the bonding between the protection film 10 and the support film 30 is reliable and the Peeling (Peeling) problem can not occur, the second optical cement 61 can not be lifted and interfered with the cover plate glass 70 to be scratched, so that the cover plate glass 70 is tightly attached to the second optical cement 61, and the attachment qualification rate of the cover plate glass 70 is improved. By adopting the existing first adhesive layer, the reject ratio generated by optical adhesive scraping is about 6%, and by adopting the first ultraviolet ray anti-sticking layer 11, the problem of optical adhesive scraping can not occur.
For example, the ultraviolet rays may be generated by an ultraviolet lamp and the irradiation treatment may be performed from the side of the protective film 10 away from the first ultraviolet ray anti-adhesive layer 11. Irradiating the ultraviolet lamp with preset power for preset time to enable the accumulated energy of the ultraviolet rays to be in a preset range. The irradiation power and the irradiation time of the ultraviolet lamp are not limited, and those skilled in the art can set the irradiation power and the irradiation time according to the actual conditions such as the material ratio of the first ultraviolet ray anti-adhesive layer 11. The first ultraviolet ray anti-adhesive layer 11 has a first irradiation viscosity after irradiation with ultraviolet rays, and the first irradiation viscosity of the first ultraviolet ray anti-adhesive layer after irradiation with ultraviolet rays is 15 to 25gf/25 mm. The first irradiation viscosity is less than the first initial viscosity, and the first irradiation viscosity is less than the preset viscosity of the first optical adhesive 41, so that the support film 30 is not damaged by tearing while the protection film 10 is easily and conveniently torn off, and the support film 30 is not torn off from the display module 50.
Optionally, the first ultraviolet ray anti-adhesive layer 11 has an initial viscosity of 2000 to 2500gf/25mm, and the first ultraviolet ray anti-adhesive layer 11 is configured such that the viscosity thereof is reduced to 15 to 25gf/25mm at 1000mj to 2000mj of accumulated ultraviolet irradiation energy. That is, the first initial viscosity of the first ultraviolet ray anti-adhesive layer 11 is 2000 to 2500gf/25mm, and the first initial viscosity has a first irradiation viscosity of 15 to 25gf/25mm when the ultraviolet ray irradiation treatment is performed and the cumulative ultraviolet ray irradiation energy is 1000mj to 2000 mj. Therefore, the protective film 10 can be conveniently removed, the supporting film 30 is prevented from being influenced by overlarge viscosity of the protective film 10 in the process of tearing the protective film, the protective film 10 can be prevented from being torn together with a guide film 80 to be described later due to the overlarge viscosity of the protective film, and the protective effect on the supporting film 30 and the display module 50 in the subsequent process is lost.
As described above, in the manufacturing process of the flexible display panel according to the first embodiment of the present invention, the support film 30 and the protection film 10 are bonded together through the first ultraviolet ray anti-adhesive layer 11 in the protection film 10, and the first ultraviolet ray anti-adhesive layer 11 has the first initial viscosity, and the first initial viscosity can stably and reliably bond the support film 30 and the protection film 10 together, so as to avoid a Peeling (Peeling) problem between the support film 30 and the protection film 10 during the profiling bending process, and further avoid the second optical adhesive 61 from being lifted and scratched due to interference with the cover glass 70, so that the cover glass 70 is tightly bonded to the second optical adhesive 61, the bonding yield of the cover glass 70 is improved, and the defect rate of the flexible display panel is reduced. After the ultraviolet irradiation treatment is performed on the protective film 10, the first ultraviolet ray anti-adhesive layer 11 has a first irradiation viscosity with a lower viscosity, and the protective film 10 can be easily removed without affecting the support film 30.
A manufacturing process of a flexible display panel according to a second embodiment of the present invention is described with reference to fig. 4a to 4g, where fig. 4a to 4g are schematic diagrams of a manufacturing process of a flexible display panel according to the second embodiment of the present invention.
Alternatively, the second initial viscosity of the second ultraviolet ray anti-adhesive layer 21 may be in the range of 2000 to 2500gf/25mm to provide the protective film 10 and the support film 30 with higher adhesive strength; the second irradiation viscosity range of the second ultraviolet ray anti-adhesive layer 21 may be 15 to 25gf/25mm, so that the removal of the protection film 10 is easy and convenient without causing damage to the support film 30. The wavelength range of the ultraviolet rays to be treated by ultraviolet irradiation may be 365nm to 385 nm.
The support film 30 is adhered to the protective film 10 through the second uv-decreasing adhesive layer 21, which is the same as step 20 in the first embodiment and will not be described again.
And step 30, sequentially bonding a display module 50 and cover glass 70 on one side of the support film 30 far away from the first ultraviolet ray anti-adhesion layer 11 through optical cement. Referring to fig. 4b to 4f, the step 30 is the same as the step 30 in the first embodiment, and is not repeated herein.
And step 40, irradiating ultraviolet rays from the side of the protective film 10 far away from the first ultraviolet ray anti-adhesion layer 11 to reduce the viscosity of the first ultraviolet ray anti-adhesion layer 11 and the second ultraviolet ray anti-adhesion layer 21. After the cover glass is bonded to the profile display module, the cover glass is irradiated with ultraviolet rays from the side of the protective film 10 away from the first ultraviolet ray anti-adhesive layer 11.
The ultraviolet irradiation process is the same as the ultraviolet irradiation step of step 40 in the first embodiment, and is not described again here.
Alternatively, the second ultraviolet ray anti-adhesive layer 21 is the same as the first ultraviolet ray anti-adhesive layer 11, that is, the second ultraviolet ray anti-adhesive layer 21 has a second irradiation viscosity after irradiation with ultraviolet rays, and the second irradiation viscosity of the second ultraviolet ray anti-adhesive layer after irradiation with ultraviolet rays is 15 to 25gf/25 mm. The second irradiation viscosity is less than the second initial viscosity, and the second irradiation viscosity is less than the preset viscosity of the second optical adhesive 41, so that the support film 30 is not damaged by tearing or the like while the protection film 10 is easily and conveniently torn off, and the support film 30 is not torn off from the display module 50.
Optionally, the second ultraviolet ray anti-adhesive layer 21 has an initial viscosity of 2000 to 2500gf/25mm, and the second ultraviolet ray anti-adhesive layer 21 is configured such that the viscosity thereof is reduced to 15 to 25gf/25mm at 1000mj to 2000mj of accumulated ultraviolet ray irradiation energy. That is, the second ultraviolet ray anti-adhesive layer 21 has a second initial viscosity of 2000 to 2500gf/25mm, and has a second irradiation viscosity of 15 to 25gf/25mm when subjected to the ultraviolet ray irradiation treatment and the cumulative ultraviolet ray irradiation energy is 1000mj to 2000 mj. Therefore, the protective film 10 can be conveniently removed, the supporting film 30 is prevented from being influenced by overlarge viscosity of the protective film 10 in the process of tearing the protective film, the protective film 10 can be prevented from being torn together with a guide film 80 to be described later due to the overlarge viscosity of the protective film, and the protective effect on the supporting film 30 and the display module 50 in the subsequent process is lost.
As described above, in the manufacturing process of the flexible display panel provided by the second embodiment of the present invention, the support film 30 and the protection film 10 are bonded together through the first ultraviolet ray anti-adhesive layer 11 and the second ultraviolet ray anti-adhesive layer 21, and the first ultraviolet ray anti-adhesive layer 11 and the second ultraviolet ray anti-adhesive layer 21 have relatively high initial viscosity, so that the support film 30 and the protection film 10 are stably and reliably bonded together, thereby avoiding a Peeling (Peeling) problem between the support film 30 and the protection film 10 during the profiling bending process, further avoiding the second optical adhesive 61 from being lifted and scratched due to interference with the cover glass 70, enabling the cover glass 70 to be tightly bonded with the second optical adhesive 61, improving the bonding qualification rate of the cover glass 70, and reducing the reject ratio of the flexible display panel. After the ultraviolet irradiation treatment is performed on the protective film 10, the first ultraviolet ray anti-adhesive layer 11 and the second ultraviolet ray anti-adhesive layer 21 have irradiation viscosities with low viscosities, and the protective film 10 can be easily removed without affecting the support film 30.
A manufacturing process of a flexible display panel in a third embodiment of the present invention is described with reference to fig. 5a to 5h, where fig. 5a to 5h are schematic diagrams of a manufacturing process of a flexible display panel provided in the third embodiment of the present invention.
And step 30, sequentially bonding a display module 50 on one side of the support film 30 far away from the first ultraviolet ray anti-adhesion layer 11 through optical cement. Referring to fig. 5b, a display module 50 is bonded to the side of the support film 30 away from the first uv anti-adhesive layer 11 by the first optical adhesive 41. Referring to fig. 5c, a second optical adhesive 61 is disposed on the upper surface of the display module 50, i.e., the display surface of the display module 50. The steps of fig. 5b and 5c are the same as those of fig. 4b and 4c, and are not repeated herein.
And step 40, providing a guide film 80, and adhering the guide film 80 to the side of the protective film 10 far away from the first ultraviolet ray anti-adhesion layer 11. The guide film 80 is used for guiding the bending of the display module to be profiled when the profiling bending. The guide film 80 may be a polyimide, polystyrene, polyethylene terephthalate (PET) film, or the like. The guide membrane 80 is a flexible membrane that can be bent during the profiling bending process.
In some examples, the guide film 80 is attached to the side of the protective film 10 away from the first ultraviolet ray anti-adhesive layer 11 by ordinary optical glue. In other examples, the guide film 80 is attached to the side of the protective film 10 away from the first uv tack-reducing layer 11 by uv tack-reducing glue, with particular reference to step 50 described below.
Note that the guide film 80 may also be provided by an ultraviolet ray anti-adhesive film having a third ultraviolet ray anti-adhesive layer 81. Specifically, the ultraviolet ray anti-adhesive film includes a guide film 80, a third ultraviolet ray anti-adhesive layer 81 on one side of the guide film 80, and a release film on the other side of the third ultraviolet ray anti-adhesive layer 81 and capable of being torn, so that the release film only needs to be torn from the surface of the third ultraviolet ray anti-adhesive layer 81 when the protective film 10 is adhered, thereby improving the preparation efficiency.
Similar to the protective film 10 and the first ultraviolet ray anti-adhesive layer 11, the third ultraviolet ray anti-adhesive layer 81 can also be peeled off from the surface of the protective film 10 along with the guide film 80.
Specifically, the guiding film 80 is clamped by the film clamping structure of the bending device, and the guiding film 90 is bent, so that the guiding film 90 guides the protective film 10, the support film 30 and the display module 50 to be bent, and the damage of the film clamping structure to the bending of the protective film 10, the support film 30 and the display module 50 can be avoided. The preparation method of the invention does not limit the bending equipment and the film clamping structure thereof.
The third ultraviolet ray anti-adhesive layer 81 has a third initial viscosity, and the third initial viscosity of the third ultraviolet ray anti-adhesive layer 81 can be 2000-2500 gf/25mm, so that the guide film 80 and the protective film 10 have appropriate bonding strength, and the influence on the display module 50 caused by peeling of the guide film 80 and the protective film 10 in the profiling bending and cover glass 70 attaching process is avoided. After the third ultraviolet ray anti-adhesive layer 81 is subjected to the ultraviolet ray irradiation treatment, it has a third irradiation viscosity. The viscosity of the third ultraviolet ray anti-adhesive layer after being irradiated by ultraviolet rays is 5-10 gf/25mm, and the guide film 80 can be easily torn off. Since the third radiation viscosity may be smaller than the first radiation viscosity, the protective film 10 is not torn together when the guide film 80 is removed. Alternatively, the difference between the third radiation viscosity and the first radiation viscosity may be in a range of 10 to 15gf/25 mm. Alternatively, the third radiation viscosity is less than the second radiation viscosity, conveniently such that the protective film 10 is not torn off together when the guide film 80 is removed.
Alternatively, in the embodiment of the present invention, the third UV-ray anti-adhesive layer 81 is configured to reduce the viscosity thereof to 5 to 10gf/25mm when the cumulative UV irradiation energy is 1000mj to 2000 mj. Irradiating the guide film 80 and the protective film 10 with ultraviolet rays of a predetermined power for a predetermined time to reduce the viscosity of the third ultraviolet ray anti-adhesive layer 81 to 5-10 gf/25mm when the cumulative energy of the ultraviolet rays is in the range of 1000 mj-2000 mj, so that the removal of the guide film 80 is simple and convenient, and the protective film 10 is not affected. Those skilled in the art can design the third uv anti-adhesive layer 81 according to the material ratio, the power of the uv lamp, and other practical conditions.
Step 90, the protection film 10 is torn off from the side of the support film 30 far away from the first optical glue 41. Referring to fig. 5h, when the protective film 10 is peeled off from the side of the support film 30 away from the first optical paste 41, the second ultraviolet ray anti-adhesive layer 21 is peeled off together with the protective film 10 from the side of the support film 30 away from the first optical paste 41.
In one possible embodiment, the uv wavelength range is 365nm to 385nm, which makes the treatment of the protective film 10 and the guide film 80 more efficient.
Therefore, in the manufacturing process of the flexible display panel provided by the third embodiment of the present invention, the support film 30 and the protection film 10 are bonded together through the first ultraviolet ray anti-adhesive layer 11 and the second ultraviolet ray anti-adhesive layer 21 in the protection film 10, and the first ultraviolet ray anti-adhesive layer 11 and the second ultraviolet ray anti-adhesive layer 21 have strong initial viscosity, and the initial viscosity can stably and reliably bond the support film 30 and the protection film 10 together, so that a Peeling (Peeling) problem between the support film 30 and the protection film 10 in a profiling bending process is avoided, further, the second optical adhesive 61 is prevented from being lifted and interfered with the cover glass 70 to be scratched, the cover glass 70 is tightly bonded with the second optical adhesive 61, the bonding qualification rate of the cover glass 70 is improved, and the reject ratio of the flexible display panel is reduced. Further, the ultraviolet irradiation treatment is simultaneously performed on the guide film 80 and the protective film 10 while changing the viscosities of the first ultraviolet anti-adhesive layer 11, the second ultraviolet anti-adhesive layer 21, and the third ultraviolet anti-adhesive layer 81 such that the third ultraviolet anti-adhesive layer 81 has a third irradiation viscosity that is less than the first irradiation viscosity or the second irradiation viscosity, so that the protective film 10 is not torn off when the guide film 80 is removed after the cover glass 70 is attached; in the subsequent step, since the protective film 10 has the first irradiation viscosity having a lower viscosity, the protective film 10 can be easily removed without affecting the support film 30. That is, the viscosity of the first ultraviolet ray anti-adhesion layer 11, the second ultraviolet ray anti-adhesion layer 21 and the third ultraviolet ray anti-adhesion layer 81 can be changed simultaneously to different degrees by one ultraviolet ray irradiation treatment, and the removal guide film 80 and the protection film 10 are not affected by each other, so that the preparation process of the flexible display panel is simplified, the processing efficiency is improved, and the processing cost is reduced.
Alternatively, the ultraviolet irradiation treatment may be performed twice, and the guide film 80 may be removed after the first ultraviolet irradiation treatment, and the protective film 10 may be removed after the second ultraviolet irradiation treatment. The concrete selection can be carried out according to the actual situation.
In one possible embodiment, after the protective film 10 is removed, a composite tape is bonded to the side of the support film 30 away from the first optical adhesive 41. The composite adhesive tape can be formed by compounding materials such as foam, copper foil and graphene, and is used for radiating and protecting the flexible display panel. In the preparation method of the embodiment of the invention, in the process flow between the attaching and bonding of the cover glass 70 to the composite adhesive tape, the protective film 10 is provided to work together, so that the protective film 10 can protect the support film 30 and the display module 50.
The embodiment of the invention also provides a display device, which comprises a shell and the flexible display panel obtained by the preparation method of the flexible display panel; the flexible display panel is mounted within the housing.
Specifically, the display device of the present embodiment may be a device with a display function, such as a mobile phone, a display, a television, and a tablet computer. The structure and function of the flexible display panel may be the same as those of the above embodiments, and are not described in detail. The housing may be a variety of plastic or metal housings, and the flexible display panel may be mounted within the housing.
The flexible display panel provided by the embodiment of the invention is prepared by adopting the preparation process, so that the yield of the flexible display panel is improved, and the reject ratio of cover plate glass attachment is reduced; the processing technology of the flexible display panel is simplified, the processing efficiency of the flexible display panel is improved, and the processing cost of the flexible display panel is reduced.
Since the display device of the present embodiment includes the flexible display panel of the above embodiment, the advantages of the display device are the same as those of the flexible display panel, and are not described herein again.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for manufacturing a flexible display panel, comprising:
providing a protective film, wherein the protective film comprises a first ultraviolet ray anti-adhesion layer;
the protective film is bonded with a supporting film through the first ultraviolet ray anti-adhesion layer;
sequentially bonding a display module and cover plate glass on one side of the support film far away from the first ultraviolet ray anti-adhesion layer through optical cement;
irradiating the side, far away from the first ultraviolet ray anti-adhesion layer, of the protective film by using ultraviolet rays to reduce the viscosity of the first ultraviolet ray anti-adhesion layer;
and tearing off the protective film.
2. The method of claim 1, further comprising, before the step of bonding a support film to the first ultraviolet ray adhesion-reducing layer:
forming a second ultraviolet ray anti-adhesion layer on the first ultraviolet ray anti-adhesion layer, and adhering the support film on the second ultraviolet ray anti-adhesion layer;
after the step of bonding a display module assembly and a cover plate glass in proper order through the optical cement in the one side of keeping away from first ultraviolet ray viscidity layer at the supporting film, still include: and irradiating the side, far away from the first ultraviolet ray anti-adhesion layer, of the protective film by using the ultraviolet rays to reduce the viscosity of the first ultraviolet ray anti-adhesion layer and the second ultraviolet ray anti-adhesion layer.
3. The method for manufacturing a cover glass according to claim 2, further comprising, before the step of bonding a cover glass by an optical cement:
providing a guide film;
and adhering the guide film to one side of the protective film, which is far away from the first ultraviolet ray anti-adhesion layer.
4. The production method according to claim 3, wherein the guide film is bonded to a side of the protective film remote from the first ultraviolet ray anti-adhesive layer through a third ultraviolet ray anti-adhesive layer.
5. A manufacturing method according to claim 3 or 4, further comprising, after the step of optically bonding a display module and before the step of optically bonding a cover glass: and clamping the guide film by using a film clamping structure of a bending device, and bending the guide film so as to lead the guide film to guide the protective film, the support film and the display module to be bent.
6. The production method according to claim 4, characterized in that irradiation with the ultraviolet rays is performed from a side of the guide film away from the protective film to lower the viscosity of the third ultraviolet ray anti-adhesive layer, and the viscosity of the third ultraviolet ray anti-adhesive layer after ultraviolet ray irradiation is smaller than the viscosity of the first ultraviolet ray anti-adhesive layer or the second ultraviolet ray anti-adhesive layer after ultraviolet ray irradiation;
and tearing off the guide film.
7. The method of manufacturing according to claim 6, wherein the first and second ultraviolet ray anti-adhesive layers have an initial viscosity of 2000 to 2500gf/25 mm; the viscosity of the first ultraviolet ray anti-adhesion layer and the viscosity of the second ultraviolet ray anti-adhesion layer after ultraviolet ray irradiation are 15-25 gf/25 mm;
the initial viscosity of the third ultraviolet ray anti-adhesion layer is 2000-2500 gf/25 mm; the viscosity of the third ultraviolet ray anti-adhesive layer after being irradiated by ultraviolet rays is 5-10 gf/25 mm.
8. The production method according to claim 7, wherein the first ultraviolet ray anti-adhesive layer and the second ultraviolet ray anti-adhesive layer are configured such that the viscosity thereof decreases to 15 to 25gf/25mm at 1000mj to 2000mj of accumulated ultraviolet ray irradiation energy upon irradiation with the ultraviolet ray from a side of the guide film away from the protective film;
and the third UV-ray anti-adhesive layer is configured to have a viscosity reduced to 5 to 10gf/25mm when the cumulative UV irradiation energy is 1000mj to 2000 mj.
9. The production method according to any one of claims 1 to 8, wherein the wavelength of the ultraviolet light is 365nm to 385 nm.
10. A display device comprising a housing and a flexible display panel obtained by the method for manufacturing a flexible display panel according to any one of claims 1 to 9, the flexible display panel being mounted in the housing.
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