CN108333820B - Display screen and cutting method thereof - Google Patents

Display screen and cutting method thereof Download PDF

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Publication number
CN108333820B
CN108333820B CN201810146616.8A CN201810146616A CN108333820B CN 108333820 B CN108333820 B CN 108333820B CN 201810146616 A CN201810146616 A CN 201810146616A CN 108333820 B CN108333820 B CN 108333820B
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display panel
cutting
laser beam
protective layer
display screen
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CN108333820A (en
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李雪萍
黄立为
辛燕霞
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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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
    • G02F1/133351—Manufacturing of individual cells out of a plurality of cells, e.g. by dicing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
    • B23K26/0608—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams in the same heat affected zone [HAZ]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/40—Removing material taking account of the properties of the material involved
    • B23K26/402—Removing material taking account of the properties of the material involved involving non-metallic material, e.g. isolators
    • 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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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention discloses a display screen and a cutting method thereof, and belongs to the technical field of display. The display screen mother board comprises a lower protective layer, a display panel and an upper protective layer which are arranged in a stacked mode, and the method comprises the following steps: cutting the upper protective layer by adopting a first laser beam to obtain a first cutting opening, wherein the first cutting opening is in contact with the display panel; cutting the display panel by adopting a second laser beam at a position close to the target display screen in the first cutting opening to obtain a second cutting opening, wherein the second cutting opening is in contact with the lower protective layer, and the cross section area of the second cutting opening is smaller than that of the first cutting opening; and cutting the display panel and the lower protective layer by adopting a third laser beam at a position far away from the target display screen in the first cutting opening to obtain the target display screen. The invention solves the problem of lower reliability of the display screen in the related technology. The cutting device is used for cutting the display screen.

Description

Display screen and cutting method thereof
Technical Field
The invention relates to the technical field of display, in particular to a display screen and a cutting method thereof.
Background
At present, in the manufacturing process of a display screen, a display screen mother board is generally manufactured on a substrate, the display screen mother board includes a plurality of display screens arranged in an array, and then the display screen mother board is cut to obtain the display screen. The display screen mother board generally includes a lower protective layer, a display panel, and an upper protective layer, which are stacked.
In the related art, in order to achieve fine cutting of a display screen motherboard, two different laser beams are generally used to cut the display screen motherboard, and the process generally includes: and performing coarse-grained cutting on the upper protection layer by adopting a carbon dioxide laser beam (English: CO2beam) to obtain a larger cutting opening so as to determine the cutting position of the display panel, and performing fine-grained cutting on the display panel and the lower protection layer by adopting a femtosecond laser beam (English: Femto beam) at the cutting opening so as to obtain the display screens.
In the process of implementing the invention, the inventor finds that the related art has at least the following problems:
when adopting femto second laser beam to cut display panel and lower protective layer among the correlation technique, the edge of the display panel that the cutting obtained and lower protective layer is the parallel and level, it is also that display panel and lower protective layer in the display screen are in same cutting plane, in the transportation of later stage or removal process, the edge of display panel easily receives striking or collides with, leads to the rete in the display panel to appear the crackle, influences display panel's display effect, consequently the reliability of the display screen that makes among the correlation technique is lower.
Disclosure of Invention
The embodiment of the invention provides a display screen and a cutting method thereof, which can solve the problem of low reliability of the display screen in the related technology. The technical scheme is as follows:
in one aspect, a cutting method for a display screen is provided, and is used for a display screen mother board, where the display screen mother board includes a lower protection layer, a display panel, and an upper protection layer, which are stacked, and the method includes:
cutting the upper protective layer by adopting a first laser beam to obtain a first cutting opening, wherein the first cutting opening is in contact with the display panel;
cutting the display panel by adopting a second laser beam at a position close to a target display screen in the first cutting opening to obtain a second cutting opening, wherein the second cutting opening is in contact with the lower protective layer, and the cross section area of the second cutting opening is smaller than that of the first cutting opening;
and cutting the display panel and the lower protective layer by adopting a third laser beam at a position far away from the target display screen in the first cutting opening to obtain the target display screen.
Optionally, the cutting the upper protection layer by using a first laser beam includes:
setting the focusing surface of the first laser beam on one surface, close to the display panel, of the upper protective layer, and cutting the upper protective layer by using the set first laser beam;
the cutting the display panel by using the second laser beam includes:
setting the focusing surface of the second laser beam on the surface, far away from the upper protective layer, of the display panel, and cutting the display panel by using the set second laser beam;
cutting the display panel and the lower protective layer with a third laser beam, including:
and setting the focusing surface of the third laser beam at one side of the lower protective layer far away from the display panel, and cutting the display panel and the lower protective layer by adopting the set third laser beam.
Optionally, the second laser beam and the third laser beam are emitted by the same laser emitter.
Optionally, the display panel is a flexible display panel, and the method further includes:
and bending the edge of the target display screen towards the direction far away from the upper protective layer to obtain the bent target display screen.
Optionally, the upper protective layer and the lower protective layer are made of a polyester material.
Optionally, the display panel is a liquid crystal display panel, an organic light emitting diode display panel, or a quantum dot light emitting diode display panel.
Optionally, the first laser beam is a carbon dioxide laser beam, and the second laser beam and the third laser beam are femtosecond laser beams.
In another aspect, a display screen is provided, the display screen including:
the display panel comprises a lower protective layer, a display panel and an upper protective layer which are arranged in a stacked mode;
the edge of the lower protection layer protrudes out of the edge of the display panel.
Optionally, the thickness of the lower protective layer is 90-110 micrometers.
Optionally, the edge of the lower protection layer protrudes 5-10 microns from the edge of the display panel.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the display screen and the cutting method thereof provided by the embodiment of the invention, the edge of the lower protection layer in the cut display screen protrudes out of the edge of the display panel, so that when the display screen is impacted or collided in the transportation or moving process, the lower protection layer can protect the display panel, the display panel is not easily impacted or collided directly, the display panel is prevented from being damaged, and the reliability of the display screen is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display screen according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another display screen provided in an embodiment of the present invention;
FIG. 3 is a flowchart of a method for cutting a display screen according to an embodiment of the present invention;
fig. 4 is a flowchart of a cutting process of a display panel according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
At present, the display screen mother board that obtains of making usually includes a plurality of display screens of array arrangement, and the display screen mother board generally includes lower protective layer, display panel and the last protective layer of range upon range of setting, adopts two kinds of different laser beams to cut the display screen mother board among the correlation technique usually to obtain the display screen, and the process generally includes: and performing coarse-grained cutting on the upper protective layer by adopting a carbon dioxide laser beam to obtain a larger cutting opening so as to determine the cutting position of the display panel, and performing fine-grained cutting on the display panel and the lower protective layer by adopting a femtosecond laser beam at the cutting opening so as to obtain the display screens. Wherein the cross-sectional area of the carbon dioxide laser beam is larger than that of the femtosecond laser beam. Because the laser energy of the femtosecond laser beam is vertical to the display surface of the display panel, the edges of the cut display panel and the lower protective layer are flush, on one hand, in the later transportation or movement process, the edges of the display panel are easy to be impacted or collided, and the film layer in the display panel is cracked; on the other hand, when the display screen is a flexible display screen, when the flexible display screen is bent towards a direction away from the upper protective layer, stress applied to the display panel is not easily released, so that a film layer (for example, a film layer made of Polyimide (PI)) of the display panel is damaged, and a display effect of the display panel is affected, so that the display screen manufactured in the related art has low reliability.
An embodiment of the present invention provides a display screen, which can solve the problems in the related art, and as shown in fig. 1, the display screen includes:
a lower protective layer 101, a display panel 102, and an upper protective layer 103 which are stacked; wherein, the edge of the lower protection layer 101 protrudes beyond the edge of the display panel 102.
Optionally, the display panel provided in the embodiment of the present invention may be a liquid crystal display panel, an Organic Light-Emitting Diode (OLED) display panel, or a Quantum Dot Light-Emitting Diode (QLED) display panel.
Optionally, the edge of the lower protection layer may protrude 5-10 μm beyond the edge of the display panel.
In summary, in the display screen provided in the embodiment of the present invention, because the edge of the lower protection layer protrudes beyond the edge of the display panel, when the display screen is impacted or collided during transportation or movement, the lower protection layer can protect the display panel, so that the display panel is not easily impacted or collided directly, and the display panel is prevented from being damaged, thereby improving the reliability of the display screen.
Optionally, the upper protective layer and the lower protective layer may be made of an elastically deformable material, for example, the upper protective layer and the lower protective layer may be made of a polyester material, and the polyester material may be Polyethylene terephthalate (PET). It should be noted that, the lower protective layer is made of a material capable of elastically deforming, and when the display screen is impacted or collided, the lower protective layer can absorb energy in a deformation mode, so that the display panel is prevented from being directly impacted or cracked due to collision, and the display effect of the display panel is ensured.
In practical application, the upper protective layer is only used for protecting the display panel during transportation of the display screen, and the upper protective layer needs to be peeled off after the display screen is assembled on a product; the lower protective layer can play a role in buffering the display panel, and the thickness of the lower protective layer can be 90-110 microns.
Optionally, when the display screen provided in the embodiment of the present invention is a flexible display screen, as shown in fig. 2, an edge of the display screen may be bent toward a direction away from the upper protection layer 103, and the lower protection layer drives the display panel to bend when bending, because the edge of the lower protection layer 101 protrudes from the edge of the display panel 102, compared with the related art, on one hand, a film layer in an edge area of the display screen is thin, and stress is easily released when bending the edge area; on the other hand, the edge of the lower protective layer is wider, and the deformation amount of the lower protective layer is reduced under the same curvature, so that the deformation amount of the display panel is reduced, and the stress borne by each film layer in the display panel is reduced.
In summary, according to the display screen provided by the embodiment of the invention, since the edge of the lower protection layer protrudes out of the edge of the display panel, when the display screen is impacted or collided during transportation or movement, the lower protection layer can protect the display panel, so that the display panel is not easily impacted or collided directly, the display panel is prevented from being damaged, and the reliability of the display screen is improved; further, when the display screen is the flexible display screen, the edge of the lower protective layer is widened, so that stress applied to the display panel when the display screen is bent can be reduced, the film layer of the display panel is reduced, and the display effect of the display panel is ensured.
Fig. 3 is a flowchart of a method for cutting a display screen according to an embodiment of the present invention, where the method is used for a display screen motherboard, where the display screen motherboard includes a lower protection layer, a display panel, and an upper protection layer, which are stacked, and the method may be used for manufacturing the display screen according to an embodiment of the present invention, and as shown in fig. 3, the method may include:
step 301, cutting the upper protection layer by using a first laser beam to obtain a first cut, wherein the first cut is in contact with the display panel.
And 302, cutting the display panel by using a second laser beam at a position close to the target display screen in the first cutting opening to obtain a second cutting opening, wherein the second cutting opening is in contact with the lower protective layer, and the cross section area of the second cutting opening is smaller than that of the first cutting opening.
And 303, cutting the display panel and the lower protective layer by adopting a third laser beam at a position far away from the target display screen in the first cutting opening to obtain the target display screen.
The structure of the target display screen obtained by cutting with the display screen cutting method may be as shown in fig. 1, and the target display screen may include a lower protective layer 101, a display panel 102, and an upper protective layer 103, which are stacked; wherein, the edge of the lower protection layer 101 protrudes beyond the edge of the display panel 102.
In summary, according to the cutting method of the display screen provided in the embodiment of the present invention, after the first laser beam is used to cut the upper protection layer to obtain the first cut, the second laser beam is used to cut the display panel in the position close to the target display screen in the first cut to obtain the second cut, and then the third laser beam is used to cut the display panel and the lower protection layer in the position away from the target display screen in the first cut to obtain the target display screen.
In the embodiment of the invention, the laser beam can be controlled to be perpendicular to the display surface of the display screen for cutting, so that the cutting efficiency of the display screen is improved.
Optionally, the display panel provided by the embodiment of the invention may be a liquid crystal display panel, an OLED display panel, or a QLED display panel.
Fig. 4 is a flowchart of a cutting process of a display screen according to an embodiment of the present invention, and as shown in fig. 4, the cutting process includes:
and S1, providing a display screen mother board which comprises a lower protective layer 101, a display panel 102 and an upper protective layer 103 which are arranged in a stacked mode.
S2, a focusing surface of the first laser beam a is set on a surface of the upper protective layer 103 close to the display panel 102, the set first laser beam a is used to cut the upper protective layer 103, so as to obtain a first cut H1, and the first cut H1 is in contact with the display panel 102.
Alternatively, the first laser beam may be a carbon dioxide laser beam, and the first cutting slit is used to determine a cutting position of the display panel.
S3, in the first cut H1, at a position close to the target display screen M, setting a focal plane of the second laser beam B on a surface of the display panel 102 away from the upper protection layer 103, cutting the display panel 102 with the set second laser beam B to obtain a second cut H2, and contacting the second cut H2 with the lower protection layer 101.
Optionally, the thickness of the lower protective layer may be 90 to 110 micrometers, and since the lower protective layer may bear a certain degree of over-etching, the focal plane of the second laser beam may be disposed on the contact surface of the lower protective layer and the display panel to ensure that the second laser beam may completely cut the display panel, that is, to ensure that the second cutting opening penetrates through the display panel. Wherein the second laser beam may be a femtosecond laser beam.
It should be noted that the cross-sectional area of the carbon dioxide laser beam is larger than that of the femtosecond laser beam, and thus the cross-sectional area of the second cut obtained is smaller than that of the first cut.
S4, at a position where the first cutting H1 is away from the target display screen M, a focusing surface of the third laser beam C is set on a side of the lower protective layer 101 away from the display panel 102, and the display panel 102 and the lower protective layer 101 are cut by the set third laser beam C.
Optionally, the second laser beam and the third laser beam may be emitted by the same laser emitter, and after the second cutting opening is obtained, the second laser beam may be moved 5 to 10 micrometers in a direction away from the target display screen, and a focusing surface of the laser beam is disposed on a side of the lower protection layer away from the display panel, so as to obtain the third laser beam. Wherein the third laser beam may be a femtosecond laser beam.
In practical application, the cutting at two different depths can be realized by adjusting parameters of the laser emitter, the main adjusted parameters include the frequency of the pulse laser, the power of the laser beam, the moving speed of the worktable, the focusing surface of the dynamic focusing mirror and the like, and the specific process of cutting the display screen by adopting the laser beam can refer to the related technology, which is not repeated herein.
It should be noted that in S3 and S4, the power and the cutting duration of the laser beam used in cutting the display screen are different, so as to avoid affecting the display area of the display panel.
S5, obtaining a target display screen M obtained through cutting, wherein the target display screen M comprises a lower protection layer 101, a display panel 102 and an upper protection layer 103 which are arranged in a stacked mode, and the edge of the lower protection layer 101 protrudes out of the edge of the display panel 102.
Optionally, when the display panel is a flexible display panel (including an OLED display panel and a QLED display panel), the method further includes: and bending the edge of the target display screen towards the direction far away from the upper protective layer to obtain the bent target display screen. Alternatively, the structure of the folded target display screen may be as shown in fig. 2.
It should be noted that, the sequence of the steps of the cutting method for a display screen provided in the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the circumstances, and any method that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention, and therefore, no further description is given.
According to the method for cutting the display screen, the upper protection layer is cut by the first laser beam to obtain the first cutting opening, the display panel is cut by the second laser beam to obtain the second cutting opening at the position close to the target display screen in the first cutting opening, and the display panel and the lower protection layer are cut by the third laser beam at the position far away from the target display screen in the first cutting opening to obtain the target display screen; further, when the display screen is the flexible display screen, the edge of the lower protective layer is widened, so that stress applied to the display panel when the display screen is bent can be reduced, the film layer of the display panel is reduced, and the display effect of the display panel is ensured.
The invention is not to be considered as limited to the particular embodiments shown and described, but is to be understood that various modifications, equivalents, improvements and the like can be made without departing from the spirit and scope of the invention.

Claims (7)

1. A cutting method of a display screen is characterized by being used for a display screen mother board, wherein the display screen mother board comprises a lower protective layer, a display panel and an upper protective layer which are arranged in a stacked mode, and the method comprises the following steps:
cutting the upper protective layer by adopting a first laser beam to obtain a first cutting opening, wherein the first cutting opening is in contact with the display panel;
cutting the display panel by adopting a second laser beam at a position close to a target display screen in the first cutting opening to obtain a second cutting opening, wherein the second cutting opening is in contact with the lower protective layer, and the cross section area of the second cutting opening is smaller than that of the first cutting opening;
cutting the display panel and the lower protective layer by adopting a third laser beam at a position far away from the target display screen in the first cutting opening to obtain the target display screen;
the edge of the lower protection layer of the target display screen protrudes out of the edge of the display panel.
2. The method of claim 1, wherein said cutting the upper protective layer with a first laser beam comprises:
setting the focusing surface of the first laser beam on one surface, close to the display panel, of the upper protective layer, and cutting the upper protective layer by using the set first laser beam;
the cutting the display panel by using the second laser beam includes:
setting the focusing surface of the second laser beam on the surface, far away from the upper protective layer, of the display panel, and cutting the display panel by using the set second laser beam;
cutting the display panel and the lower protective layer with a third laser beam, including:
and setting the focusing surface of the third laser beam at one side of the lower protective layer far away from the display panel, and cutting the display panel and the lower protective layer by adopting the set third laser beam.
3. The method according to claim 1 or 2,
the second laser beam and the third laser beam are emitted by the same laser emitter.
4. The method of claim 1, wherein the display panel is a flexible display panel, the method further comprising:
and bending the edge of the target display screen towards the direction far away from the upper protective layer to obtain the bent target display screen.
5. The method of claim 1,
the upper protective layer and the lower protective layer are made of a polyester material.
6. The method of claim 1,
the display panel is a liquid crystal display panel, an organic light emitting diode display panel or a quantum dot light emitting diode display panel.
7. The method of claim 1,
the first laser beam is a carbon dioxide laser beam, and the second laser beam and the third laser beam are femtosecond laser beams.
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CN109192881B (en) * 2018-09-21 2021-02-23 武汉华星光电半导体显示技术有限公司 Organic light emitting diode display panel and cutting method thereof
CN109434307A (en) * 2018-12-29 2019-03-08 大族激光科技产业集团股份有限公司 A kind of laser cutting method and laser cutting device of flexible screen
CN110853515B (en) * 2019-11-20 2022-04-08 京东方科技集团股份有限公司 Display panel, cutting method thereof and display device
CN111739424B (en) * 2020-06-30 2022-01-28 Oppo广东移动通信有限公司 Flexible screen and foldable electronic device

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