CN109768069B - Flexible display panel, manufacturing method thereof and display device - Google Patents
Flexible display panel, manufacturing method thereof and display device Download PDFInfo
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Abstract
The invention provides a flexible display panel, a manufacturing method thereof and a display device, and relates to the technical field of display. According to the invention, the groove structure is formed in the area to be perforated of the flexible substrate, the groove structure is filled with the adhesive layer which can be lost, the functional layer covering the flexible substrate and the adhesive layer which can be lost is formed, the functional layer in the area to be perforated is removed, the adhesive layer which can be lost is removed, so that the residual functional layer material on the adhesive layer which can be lost is removed, and the area to be perforated is perforated. Through treating at flexible substrate and forming groove structure in the trompil region, but pack in groove structure and lose the viscose glue film, when getting rid of the functional layer of treating in the trompil region, the material of functional layer remains on can losing the viscose glue film, when getting rid of the can losing the viscose glue film of groove structure intussuseption, can get rid of the material of remaining functional layer on can losing the viscose glue film simultaneously for there is not the material to remain on the flexible substrate, follow-up when carrying out the trompil to the flexible substrate, the sculpture of flexible substrate can be more even, more thorough.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel, a manufacturing method thereof and a display device.
Background
With the rapid development of display technology, an OLED (Organic Light Emitting Diode) has a wide application prospect due to its advantages of high response, high contrast, flexibility and the like, and especially in the aspect of flexible display, the OLED can embody its own advantages.
At present, in order to improve the screen occupation ratio of a display device, a frameless comprehensive screen is generally adopted, the comprehensive screen comprises a special-shaped screen, a to-be-perforated area is arranged on the screen, and after a functional layer in the to-be-perforated area is removed, a flexible substrate in the to-be-perforated area is etched, so that a hole is formed and is used for placing components such as a camera, an earphone and a sensor.
However, since inorganic layers such as the thin film encapsulation layer and the metal electrode in the functional layer in the region to be perforated are difficult to be completely etched and removed, the inorganic layers may remain on the surface of the flexible substrate, and the remaining material may affect the subsequent etching of the flexible substrate, so that the etching of the flexible substrate is not uniform.
Disclosure of Invention
The invention provides a flexible display panel, a manufacturing method thereof and a display device, and aims to solve the problems that when holes are formed in a screen, a functional layer in a region to be punched is difficult to completely etch and remove, and residual materials can affect subsequent etching of a flexible substrate.
In order to solve the above problems, the present invention discloses a method for manufacturing a flexible display panel, comprising:
forming a groove structure in a region to be perforated of the flexible substrate;
filling a glue losing layer in the groove structure;
forming a functional layer covering the flexible substrate and the adhesive losing layer;
removing the functional layer in the region to be perforated;
removing the adhesive layer filled in the groove structure to remove the residual functional layer material on the adhesive layer;
and opening the area to be opened so as to penetrate through the flexible substrate.
Preferably, the step of forming the groove structure in the region to be perforated of the flexible substrate includes:
forming a groove structure in a region to be perforated of the flexible substrate by adopting a plasma etching process;
the groove structure comprises at least two grooves, the depth of the groove close to the bottom of the flexible substrate is larger than the depth of the groove far away from the bottom of the flexible substrate, and the aperture of the groove close to the bottom of the flexible substrate is smaller than the aperture of the groove far away from the bottom of the flexible substrate.
Preferably, the groove structure comprises a first groove close to the bottom of the flexible substrate and a second groove far away from the bottom of the flexible substrate;
the depth of the first groove is 1/2-2/3 of the thickness of the flexible substrate, and the aperture of the first groove is 2/3-4/5 of the aperture of the area to be perforated; the depth of the second groove is 1/3-1/2 of the thickness of the flexible substrate, and the aperture of the second groove is equal to that of the area to be perforated.
Preferably, the thickness of the flexible substrate is 10-30 μm, and the aperture of the area to be perforated is 2-5 mm.
Preferably, an orthographic projection of the groove structure on the flexible substrate is circular.
Preferably, a printing coating process or a spraying process is adopted to fill the lost adhesive layer in the groove structure.
Preferably, the step of removing the sacrificial adhesive layer filled in the groove structure to remove the residual functional layer material on the sacrificial adhesive layer includes:
irradiating the adhesive layer with UV to make the adhesive layer lose adhesiveness;
and stripping off the adhesive losing layer filled in the groove structure by adopting a sucker so as to remove the residual functional layer material on the adhesive losing layer.
Preferably, the adhesive losing layer is a UV adhesive losing layer, the 180-degree peel strength of the UV adhesive losing layer before UV irradiation is more than 6N/25mm, and the 180-degree peel strength after UV irradiation is less than 1N/25 mm.
In order to solve the problems, the invention also discloses a flexible display panel which is manufactured by adopting the manufacturing method of the flexible display panel.
In order to solve the above problem, the present invention further discloses a display device, including the above flexible display panel.
Compared with the prior art, the invention has the following advantages:
through treating at the flexible substrate and forming the groove structure in the trompil region, but pack in the groove structure and lose the viscose glue film, but form the functional layer that covers flexible substrate and lose the viscose glue film, get rid of the functional layer of treating in the trompil region, but get rid of the lost viscose glue film of the intussuseption of groove structure to but get rid of the material of the remaining functional layer on the lost viscose glue film, treat the trompil region and carry out the trompil, in order to run through the flexible substrate. Through treating at flexible substrate and forming groove structure in the trompil region, but pack in groove structure and lose the viscose glue film, when getting rid of the functional layer of treating in the trompil region, the material of functional layer remains on can losing the viscose glue film, when getting rid of the can losing the viscose glue film of groove structure intussuseption, can get rid of the material of remaining functional layer on can losing the viscose glue film simultaneously for there is not the material to remain on the flexible substrate, follow-up when carrying out the trompil to the flexible substrate, the sculpture of flexible substrate can be more even, more thorough.
Drawings
Fig. 1 shows a flow chart of a method for manufacturing a flexible display panel according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating a groove structure formed in a region to be perforated of a flexible substrate according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a filling of a sacrificial adhesive layer in a groove structure according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of forming a functional layer overlying a flexible substrate and a sacrificial adhesive layer in accordance with an embodiment of the present invention;
FIG. 5 shows a schematic view of an embodiment of the present invention removing a functional layer in the area to be apertured;
FIG. 6 is a schematic diagram illustrating a process of removing a sacrificial adhesive layer filled in a groove structure according to an embodiment of the invention;
fig. 7 is a schematic diagram illustrating the opening of the area to be opened according to the embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
Referring to fig. 1, a flowchart of a method for manufacturing a flexible display panel according to an embodiment of the present invention is shown, which may specifically include the following steps:
In the embodiment of the invention, a groove structure is formed in the region to be perforated reserved on the flexible substrate, and the groove structure may only include one groove or may include a plurality of grooves.
When the groove structure includes only one groove, a plasma etching process is used to form a groove in the region to be perforated of the flexible substrate, the depth of the groove is smaller than the thickness of the flexible substrate, for example, the depth of the groove can be set to 1/3-1/2 of the thickness of the flexible substrate, and the aperture of the groove is equal to the aperture of the region to be perforated.
When the groove structure comprises a plurality of grooves, specifically, a plasma etching process is adopted to form the groove structure in the region to be perforated of the flexible substrate; the groove structure comprises at least two grooves, the depth of the groove close to the bottom of the flexible substrate is larger than the depth of the groove far away from the bottom of the flexible substrate, and the aperture of the groove close to the bottom of the flexible substrate is smaller than the aperture of the groove far away from the bottom of the flexible substrate.
When the groove structure comprises a plurality of grooves, the depth of the groove close to the bottom of the flexible substrate is set to be larger than the depth of the groove far away from the bottom of the flexible substrate, and the aperture of the groove close to the bottom of the flexible substrate is set to be smaller than the aperture of the groove far away from the bottom of the flexible substrate, so that the groove structure is arranged in a ladder shape, when a functional layer in a region to be perforated is removed subsequently, the material of the functional layer can be delayed to permeate from a gap between the adhesive layer and the flexible substrate, and the material residue of the functional layer is further avoided.
As shown in fig. 2, the groove structure 110 includes a first groove 111 near the bottom of the flexible substrate 11 and a second groove 112 far from the bottom of the flexible substrate 11; the depth h1 of the first groove 111 is 1/2-2/3 of the thickness of the flexible substrate 11, and the aperture d1 of the first groove 111 is 2/3-4/5 of the aperture of the area to be perforated; the depth h2 of the second groove 112 is 1/3-1/2 of the thickness of the flexible substrate 11, and the aperture d2 of the second groove 112 is equal to the aperture of the area to be perforated.
The flexible substrate 11 may be a PI (Polyimide) substrate, the thickness of the flexible substrate 11 is 10-30 μm, and the aperture of the region to be perforated is 2-5 mm; the orthographic projection of the groove structure 110 on the flexible substrate 11 is circular.
For example, a groove structure 110 is formed in a region to be perforated of the flexible substrate 11 having a thickness of 10 μm, the groove structure 110 including a first groove 111 having a depth of 6 μm and a hole diameter of 1.6mm, and a second groove 112 having a depth of 5 μm and a hole diameter of 2 mm.
It should be noted that fig. 2 shows a schematic diagram that the groove structure 110 includes two grooves, and when the groove structure 110 includes only one groove, the first groove 111 in fig. 2 may be removed, and only the second groove 112 in fig. 2 remains; when the groove structure 110 includes 3 grooves, a third groove may be further disposed on the basis of fig. 2, and a depth of the third groove is greater than a depth of the first groove 111, and an aperture of the third groove is smaller than an aperture of the first groove 111, so that the entire groove structure 110 is arranged in a step shape.
And step 102, filling a viscous layer in the groove structure.
As shown in fig. 3, after forming the groove structure 110 in the region to be perforated of the flexible substrate 11, the groove structure 110 is filled with the fugitive adhesive layer 12, so that the fugitive adhesive layer 12 is flush with the flexible substrate 11 in a direction perpendicular to the flexible substrate 11.
The anti-adhesive layer 12 is an UV (Ultra-violet, ultraviolet) anti-adhesive layer, that is, an adhesive material whose viscosity is disabled by UV irradiation, the material of the UV anti-adhesive layer includes a thermoplastic elastomer, a tackifying resin and other additives, the thermoplastic elastomer may be a styrene/butadiene/styrene block copolymer or a styrene/isoprene/styrene block copolymer, the tackifying resin may be any one of a polymeric tackifying resin, a rosin tackifying resin, and a terpene tackifying resin, and the UV anti-adhesive layer is soluble in solvents such as toluene and acetone to form a solution, so that the printing and coating process or the spraying process may be adopted to fill the anti-adhesive layer 12 in the groove structure 110.
As shown in fig. 4, a functional layer 13 is formed on the flexible substrate 11 such that the functional layer 13 covers the flexible substrate 11 and the sacrificial adhesive layer 12, and the functional layer 13 includes inorganic layers such as a thin film encapsulation layer, a metal electrode layer, and a passivation layer, and organic layers such as an organic light emitting layer.
In the actual manufacturing process, the organic layer is usually manufactured by adopting a printing process, and the Ultraviolet (UV) irradiation is required to be adopted for curing after the printing is completed, so that when the organic layer is manufactured, in order to prevent the viscous layer 12 from losing viscosity in advance, the viscous layer 12 filled in the groove structure 110 needs to be shielded by a mask plate, the inorganic layer is usually manufactured by adopting a deposition process, the UV irradiation is not required in the manufacturing process, and therefore, the viscous layer 12 filled in the groove structure 110 does not need to be shielded when the inorganic layer is manufactured.
And 104, removing the functional layer in the area to be perforated.
As shown in fig. 5, when the functional layer 13 in the region to be opened is removed by an etching process, most of the material of the functional layer 13 may be removed, but a part of the material of the functional layer 13 may remain on the sacrificial adhesive layer 12, wherein mainly the inorganic layer in the functional layer 13 is difficult to be completely removed by etching, and the remaining material P mainly refers to the material of the inorganic layer in the functional layer 13.
And 105, removing the sacrificial adhesive layer filled in the groove structure to remove the residual functional layer material on the sacrificial adhesive layer.
As shown in fig. 6, the sacrificial adhesive layer 12 filled in the groove structure 110 is removed, and when the sacrificial adhesive layer 12 filled in the groove structure 110 is removed, the material P of the functional layer remaining on the sacrificial adhesive layer 12 can be removed at the same time, so that no material remains on the flexible substrate 11, and the flexible substrate 11 is etched more uniformly and more thoroughly when the flexible substrate 11 is subsequently perforated.
Specifically, UV is adopted to irradiate the adhesive losing layer so as to enable the adhesive losing layer to lose viscosity; and stripping off the adhesive losing layer filled in the groove structure by adopting a sucker so as to remove the residual functional layer material on the adhesive losing layer.
And irradiating the inner filling of the groove structure 110 with UV to make the inner filling of the groove structure 12 lose viscosity, and then stripping off the inner filling of the groove structure 110 with the suction cup to remove the residual functional layer material on the inner filling of the groove structure 12.
Wherein the adhesive losing layer is a UV adhesive losing layer, the 180-degree peel strength of the UV adhesive losing layer before UV irradiation is more than 6N/25mm, and the 180-degree peel strength after UV irradiation is less than 1N/25 mm.
It can be seen that after the UV is used to irradiate the sacrificial adhesive layer 12 filled in the groove structure 110, the peel strength is greatly reduced, which facilitates peeling off the sacrificial adhesive layer 12.
And 106, perforating the area to be perforated so as to penetrate through the flexible substrate.
As shown in fig. 7, a plasma etching process is used to etch the region to be perforated, so as to complete the perforation and penetrate through the flexible substrate 11, and then components such as a camera, a receiver, a sensor, etc. can be placed in the perforation.
In the embodiment of the invention, a groove structure is formed in the region to be perforated of the flexible substrate, the groove structure is filled with the adhesive layer which can be lost, the functional layer covering the flexible substrate and the adhesive layer which can be lost is formed, the functional layer in the region to be perforated is removed, the adhesive layer which can be lost and is filled in the groove structure is removed, so that the residual material of the functional layer on the adhesive layer can be removed, and the region to be perforated is perforated so as to penetrate through the flexible substrate. Through treating at flexible substrate and forming groove structure in the trompil region, but pack in groove structure and lose the viscose glue film, when getting rid of the functional layer of treating in the trompil region, the material of functional layer remains on can losing the viscose glue film, when getting rid of the can losing the viscose glue film of groove structure intussuseption, can get rid of the material of remaining functional layer on can losing the viscose glue film simultaneously for there is not the material to remain on the flexible substrate, follow-up when carrying out the trompil to the flexible substrate, the sculpture of flexible substrate can be more even, more thorough.
Example two
The embodiment of the invention provides a flexible display panel which is manufactured by adopting the manufacturing method of the flexible display panel.
Firstly, a groove structure 110 is formed in an area to be perforated of a flexible substrate 11, a viscous layer 12 is filled in the groove structure 110, then a functional layer 13 is formed on the flexible substrate 11, the functional layer 13 covers the flexible substrate 11 and the viscous layer 12, the functional layer 13 in the area to be perforated is removed by adopting an etching process, then the viscous layer 12 filled in the groove structure 110 is removed, when the viscous layer 12 filled in the groove structure 110 is removed, residual functional layer materials on the viscous layer 12 can be removed at the same time, finally, the area to be perforated is etched, the perforation is completed, the flexible display panel is manufactured and penetrates through the flexible substrate 11.
In addition, regarding the process adopted in the manufacturing process of the flexible display panel and other related parameters, reference may be made to the description of the first embodiment, and details of the embodiment of the present invention are not repeated.
The embodiment of the invention also provides a display device which comprises the flexible display panel.
The display device also comprises a camera, a receiver, a sensor and other components which are subsequently arranged in the opening.
In practical applications, the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a navigator and the like.
In the embodiment of the invention, a groove structure is formed in the region to be perforated of the flexible substrate, the groove structure is filled with the adhesive layer which can be lost, the functional layer covering the flexible substrate and the adhesive layer which can be lost is formed, the functional layer in the region to be perforated is removed, the adhesive layer which can be lost and is filled in the groove structure is removed, so that the residual material of the functional layer on the adhesive layer can be removed, and the region to be perforated is perforated so as to penetrate through the flexible substrate. Through treating at flexible substrate and forming groove structure in the trompil region, but pack in groove structure and lose the viscose glue film, when getting rid of the functional layer of treating in the trompil region, the material of functional layer remains on can losing the viscose glue film, when getting rid of the can losing the viscose glue film of groove structure intussuseption, can get rid of the material of remaining functional layer on can losing the viscose glue film simultaneously for there is not the material to remain on the flexible substrate, follow-up when carrying out the trompil to the flexible substrate, the sculpture of flexible substrate can be more even, more thorough.
For simplicity of explanation, the foregoing method embodiments are described as a series of acts or combinations, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts or acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The flexible display panel, the manufacturing method thereof and the display device provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A method for manufacturing a flexible display panel is characterized by comprising the following steps:
forming a groove structure in a region to be perforated of the flexible substrate;
filling a glue losing layer in the groove structure;
forming a functional layer covering the flexible substrate and the adhesive losing layer;
removing the functional layer in the region to be perforated;
removing the adhesive layer filled in the groove structure to remove the residual functional layer material on the adhesive layer;
opening holes in the area to be opened so as to penetrate through the flexible substrate;
the step of forming the groove structure in the region to be perforated of the flexible substrate comprises the following steps:
forming a groove structure in a region to be perforated of the flexible substrate by adopting a plasma etching process;
the groove structure comprises at least two grooves, the depth of the groove close to the bottom of the flexible substrate is larger than the depth of the groove far away from the bottom of the flexible substrate, and the aperture of the groove close to the bottom of the flexible substrate is smaller than the aperture of the groove far away from the bottom of the flexible substrate.
2. The method of claim 1, wherein the groove structure comprises a first groove proximate to the bottom of the flexible substrate and a second groove distal to the bottom of the flexible substrate;
the depth of the first groove is 1/2-2/3 of the thickness of the flexible substrate, and the aperture of the first groove is 2/3-4/5 of the aperture of the area to be perforated; the depth of the second groove is 1/3-1/2 of the thickness of the flexible substrate, and the aperture of the second groove is equal to that of the area to be perforated.
3. The method according to claim 1, wherein the flexible substrate has a thickness of 10-30 μm and the aperture of the area to be perforated is 2-5 mm.
4. The method of claim 1, wherein an orthographic projection of the groove structure on the flexible substrate is circular.
5. The method of claim 1, wherein the sacrificial adhesive layer is filled in the groove structure by a printing coating process or a spraying process.
6. The method according to claim 1, wherein the step of removing the sacrificial adhesive layer filled in the groove structure to remove the residual functional layer material on the sacrificial adhesive layer comprises:
irradiating the adhesive layer with UV to make the adhesive layer lose adhesiveness;
and stripping off the adhesive losing layer filled in the groove structure by adopting a sucker so as to remove the residual functional layer material on the adhesive losing layer.
7. The method of claim 6, wherein the debondable glue layer is a UV debondable glue layer having a 180 ° peel strength greater than 6N/25mm before UV irradiation and a 180 ° peel strength less than 1N/25mm after UV irradiation.
8. A flexible display panel, characterized in that it is manufactured by the method of manufacturing a flexible display panel according to any one of claims 1 to 7.
9. A display device characterized by comprising the flexible display panel according to claim 8.
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