CN110948326A - Grinding cutter, grinding method for display panel, display panel and device - Google Patents
Grinding cutter, grinding method for display panel, display panel and device Download PDFInfo
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- CN110948326A CN110948326A CN201911204845.1A CN201911204845A CN110948326A CN 110948326 A CN110948326 A CN 110948326A CN 201911204845 A CN201911204845 A CN 201911204845A CN 110948326 A CN110948326 A CN 110948326A
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- display panel
- grinding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/07—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool
- B24B37/10—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for single side lapping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Liquid Crystal (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The embodiment of the invention provides a grinding cutter, a grinding method for a display panel, the display panel and a device, which are used for improving the strength of the ground display panel. The grinding cutter comprises a protruding portion protruding in a first direction, the protruding portion is used for grinding a display panel to be ground, and the first direction is perpendicular to the direction of the axis of the grinding cutter.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a grinding tool, a grinding method for a display panel, the display panel and a device.
[ background of the invention ]
Currently, in the manufacturing process of display panels, a display panel with a target size needs to be cut and separated from a large plate through a cutting process. In order to prevent the edge of the cut display panel from having defects such as burrs and cracks, the cut display panel is usually ground by a grinding tool, but under the current grinding process conditions, the edge of the display panel is easily damaged, and defects such as edge chipping (chipping) occur, which causes the strength of the ground display panel to be reduced, and affects the production yield.
[ summary of the invention ]
In view of the above, embodiments of the present invention provide a grinding tool, a grinding method for a display panel, a display panel and an apparatus, so as to improve the strength of the ground display panel.
In one aspect, an embodiment of the present invention provides a grinding tool, including:
the convex bulge along first direction, the bulge is used for treating to grind the display panel and grinds, first direction is the perpendicular to the direction of grinding tool's axis.
Optionally, the cross-sectional shape of the protruding portion along an axis passing through the grinding tool is a trapezoid, and the length of the trapezoid away from the bottom side of the grinding tool is smaller than the length of the trapezoid close to the bottom side of the grinding tool;
the included angle theta between the trapezoid waist and the axis of the grinding tool satisfies the following conditions: theta is more than or equal to 30 degrees and less than or equal to 45 degrees.
Optionally, the number of the convex parts is multiple; the plurality of protrusions are provided at intervals in the axial direction of the grinding tool.
The embodiment of the invention also provides a grinding method for the display panel, the grinding cutter is adopted, and the length of the protruding part is smaller than the thickness of the display panel to be ground along the axial direction of the grinding cutter; the grinding method comprises the following steps:
attaching the bulge part of the grinding cutter to a preset area of the display panel to be ground;
the display panel to be ground comprises a first surface, a second surface and a side surface; the first surface and the second surface are oppositely arranged along the thickness direction of the display panel to be ground; the side surfaces intersect the first surface and the second surface, respectively; the preset area is positioned on the side surface of the display panel to be ground; the shortest distance between the edge of the preset area close to the first surface and the first surface of the display panel to be ground is a first preset distance, the distance between the edge of the preset area close to the second surface and the second surface of the display panel to be ground is a second preset distance, and the first preset distance and the second preset distance are greater than 0;
and grinding the preset area by using the bulge.
Optionally, the grinding the preset region by using the protrusion part includes:
and rotating the grinding cutter by taking the axis of the grinding cutter as a shaft to enable the boss and the preset area to generate relative displacement.
Optionally, the display panel to be ground is formed by cutting a large panel to be cut, and the display panel to be ground includes a first substrate and a second substrate which are oppositely arranged along the thickness direction of the display panel to be ground; the surface of the first substrate far away from the second substrate is the first surface, and the surface of the second substrate far away from the first substrate is the second surface;
the first substrate includes first microcracks; the first microcracks extend from the first surface in a direction close to the second substrate; the first preset distance is the length of the first microcrack;
the second substrate includes second microcracks; the second microcracks extend from the second surface in a direction close to the first substrate; the second preset distance is the length of the second microcrack;
along the axis direction of the grinding tool, the length A of the bulge satisfies: a is less than or equal to T1-T21-T22;
wherein, T1 is the thickness of the display panel to be grinded, T21 is the length of the first microcrack, and T22 is the length of the second microcrack.
Optionally, the length T21 of the first microcrack and the thickness T01 of the first substrate satisfy:
0.1T01≤T21≤0.15T01；
the length T22 of the second microcrack and the thickness T02 of the second substrate satisfy:
0.1T02≤T22≤0.15T02。
optionally, the number of the convex parts is multiple; the plurality of the convex parts are arranged at intervals along the axial direction of the grinding cutter;
the grinding method further comprises:
and after the grinding times of one of the convex parts reach the preset times, moving the grinding cutter along the axis direction of the grinding cutter to enable the other convex part to be attached to the preset area.
The embodiment of the invention also provides a display panel which is formed by grinding by adopting the grinding method, the display panel comprises packaging glue surrounding the display area of the display panel,
the edge of the packaging adhesive is flush with the edge of the display panel.
The embodiment of the invention also provides a display device which comprises the display panel.
According to the grinding cutter, the grinding method for the display panel, the display panel and the device, the bulge part is arranged in the grinding cutter, and the bulge part is used as the grinding part of the grinding cutter. In the grinding process, the bulge part is contacted with the display panel to be ground. The length of the protruding part can be adjusted according to the thickness of the product to be ground aiming at different products to be ground. For example, for a display panel with microcracks on the cut surface, the length of the protruding portion can be set to be smaller than the thickness of the display panel to be polished, so that the protruding portion avoids the microcracks on the upper and lower surfaces of the display panel to be polished in the polishing process, thereby avoiding the occurrence of defects such as edge breakage in the display panel to be polished, and facilitating the improvement of the strength of the display panel after polishing.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a cut display panel;
FIG. 2 is a schematic view of a display panel being polished by a straight rod-like polishing tool;
FIG. 3 is a schematic diagram of a display panel being polished by a polishing tool having a groove-like structure;
FIG. 4 is a side view of an abrasive tool according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of the grinding tool of FIG. 4 taken along a plane passing through the axis;
FIG. 6 is a schematic view illustrating a display panel being polished by a polishing tool according to an embodiment of the present invention;
FIG. 7 is an enlarged schematic view of the circular region of FIG. 6;
FIG. 8 is a schematic flow chart of a polishing method according to an embodiment of the present invention;
FIG. 9 is a schematic view of the display panel to be polished in FIG. 7;
FIG. 10 is a schematic diagram of a small-sized display panel formed by cutting a large panel;
fig. 11 is a schematic diagram of a display panel according to an embodiment of the invention;
fig. 12 is a schematic diagram of a display device according to an embodiment of the invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe surfaces in embodiments of the invention, these surfaces should not be limited by these terms. These terms are only used to distinguish the various surfaces from one another. For example, a first surface may also be referred to as a second surface, and similarly, a second surface may also be referred to as a first surface, without departing from the scope of embodiments of the present invention.
In the process of implementing the solution of the present invention, the inventor has found that, in the manufacturing process of the display panel, elements such as pixels and display signal lines are generally formed on a large panel substrate, and then the formed large panel is cut into a display panel with a desired size after being attached to a cover plate and packaged. As shown in fig. 1, fig. 1 is a schematic cross-sectional view of a cut display panel, a burr (burr)2 ' may appear at an edge of a display panel 1 ' formed after cutting, and the remaining burr 2 ' may affect the appearance and strength of the display panel 1 ', so that the burr 2 ' needs to be removed by grinding to improve the smoothness of the edge of the display panel 1 ' and ensure the strength of the display panel 1 '.
Currently, a grinding method is to grind a display panel by using a straight rod type grinding tool, and as shown in fig. 2, fig. 2 is a schematic diagram of grinding the display panel by using a straight rod type grinding tool, wherein a straight rod type grinding tool 3' is attached to a cutting surface of the display panel. In the grinding process, the straight rod type grinding cutter 3 'and the display panel generate relative displacement, and burrs 2' in a cutting surface are ground and removed. However, the inventor finds in the research process that:
in the cutting operation before the grinding of the display panel, Rib-shaped microcracks (Rib marks) having a certain length are generated on the upper and lower substrates of the display panel by cutting the upper and lower substrates of the display panel, respectively. As shown in fig. 2, wherein the microcracks 10 ' are present on the outer surface of both the lower substrate 11 ' and the upper substrate 12 '. Then, by applying an external force, the micro cracks 10' are extended through the display panel to break the large panel into small-sized display panels by means of the cracks. When the cutting surface of the display panel is polished by the straight rod type polishing tool 3 ' shown in fig. 2, the polishing surface of the straight rod type polishing tool 3 ' is too large, so that the position of the display panel where the micro-crack 10 ' exists is also affected by the polishing tool, and the stress of the micro-crack 10 ' is large, so that the micro-crack 10 ' is easily damaged by the polishing tool, and the defect such as edge chipping occurs. As shown in the area 4 'in fig. 2, the microcracks 10' generated during the cutting process exist in the area 4 ', and the microcracks 10' in the area 4 'are destroyed by the straight rod type grinding tool 3', and edge breakage occurs at the position, which results in the strength reduction of the display panel.
Moreover, during the cutting operation, due to the existence of process errors, when the upper and lower substrates are respectively cut, the cutting lines positioned on the upper and lower substrates cannot be precisely consistent. Therefore, after cutting, there is a step difference between the upper and lower substrates after cutting due to the difference in the position of the cutting line on the upper and lower substrates. As shown in fig. 2, taking the cutting line on the right side of the display panel as an example, the lower substrate 11 'protrudes to the right by a certain distance compared to the upper substrate 12', resulting in an uneven cutting surface. Therefore, when the cut surface is subsequently ground by the straight-bar grinding tool 3', the stress applied to the protruding portion of the cut surface is large. If the strength of the protruding part is low, defects such as edge chipping and chipping are easily caused in the grinding process. Since the area 4 'in fig. 2 has micro cracks 10' generated during the cutting process and has a certain protruding amount compared with the upper substrate 12 ', the area 4' will be subjected to a large grinding force by the straight rod type grinding tool 3 ', which will increase the damage degree of the micro cracks 10' at the position.
At present, another grinding method is to grind the display panel by using a grinding tool with a groove-shaped structure, and as shown in fig. 3, fig. 3 is a schematic diagram of grinding the display panel by using a grinding tool with a groove-shaped structure, and a groove portion of the grinding tool 5 'is attached to a cutting surface of the display panel to grind and remove the burr 2' on the cutting surface. However, this method still causes the grinding tool 5 ' to break the micro cracks 10 ' on the upper and lower surfaces of the display panel when removing the burrs 2 '. As shown in fig. 3, edge chipping problems exist at both position 61 'and position 62'.
In view of the above, the embodiment of the present invention provides a grinding tool, as shown in fig. 4 and 5, fig. 4 is a side view of the grinding tool provided by the embodiment of the present invention, and fig. 5 is a schematic cross-sectional view of the grinding tool shown in fig. 4 along a plane passing through an axis, wherein the grinding tool 1 extends along the direction of the axis 100. The grinding tool 1 includes a protrusion 10 protruding along a first direction x, where the first direction x is a direction perpendicular to an axis 100 of the grinding tool 1, and the protrusion 10 is used for grinding a display panel to be ground.
After the display panel is cut, as shown in fig. 6 and 7, fig. 6 is a schematic view of grinding the display panel by using the grinding tool provided by the embodiment of the present invention, fig. 7 is an enlarged schematic view of a circular area in fig. 6, a protrusion 10 of the grinding tool 1 is contacted with a surface to be ground of the display panel 2 to be ground, then the grinding tool 1 is moved to drive the protrusion 10 and the surface to be ground to generate relative displacement, the surface to be ground of the display panel 2 to be ground is ground by using the moved protrusion 10, and defects such as burrs generated after the display panel is cut are removed.
According to the grinding cutter provided by the embodiment of the invention, the bulge part 10 is arranged in the grinding cutter, and the bulge part 10 is used as a grinding part of the grinding cutter. In the grinding process, the convex portion 10 is brought into contact with the display panel 2 to be ground. The length of the protrusion 10 can be adjusted according to the thickness of the product to be ground according to the embodiment of the invention. For example, for a display panel with microcracks on the cut surface, the embodiment of the present invention may set the length of the protruding portion 10 to be smaller than the thickness of the display panel 2 to be polished, so that during the polishing process, the protruding portion 10 avoids the microcracks on the upper and lower surfaces of the display panel 2 to be polished, thereby avoiding the occurrence of defects such as edge breakage during the polishing process of the display panel 2 to be polished, and being beneficial to improving the strength of the display panel after polishing.
Illustratively, as shown in fig. 7, in the embodiment of the present invention, the cross-sectional shape of the convex portion 10 along the axis 100 passing through the grinding tool 1 is a trapezoid, and the length of the trapezoid away from the bottom side of the grinding tool 1 is smaller than the length of the trapezoid close to the bottom side of the grinding tool 1. Alternatively, the length of the trapezoid away from the bottom side of the grinding tool 1 may be set to be approximately half the length of the bottom side of the grinding tool 1. The angle θ between the waist of the trapezoid and the axis 100 of the grinding tool 1 satisfies: theta is more than or equal to 30 degrees and less than or equal to 45 degrees. So set up, on the one hand, through making contained angle theta more than or equal to 30, avoid the undersize that sets up contained angle theta, can guarantee the protruding degree of bellying 10, guarantee then that bellying 10 can not contact the scope outside the target area when treating the grinding object and grind. For example, when the display panel having the microcracks on the surface is polished, the microcrack region can be avoided, the structure of the microcracks can be prevented from being damaged by the polishing operation, and the strength of the polished display panel can be ensured.
On the other hand, on the basis that the length of the trapezoid away from the bottom side of the grinding tool 1 is set to be smaller than the length of the trapezoid close to the bottom side of the grinding tool 1, the embodiment of the present invention sets the upper limit of the included angle θ to 45 °, so as to avoid setting the included angle θ too large, and thus the side edge of the protruding portion 10 (i.e., the waist of the trapezoid shown in fig. 7) can form an inclined surface with a gentle transition with respect to the grinding tool 1, and some areas with special shape design can be ground by using the inclined surface. The inclined plane design can make the effort of acting on waiting to grind the object less, avoids appearing defects such as crackle in the grinding process. For example, in the case of manufacturing a bang screen having a notch (notch) and a screen having a profile design such as an R-angle, the inclined surface may serve as a grinding portion to grind these profile regions to reduce the force applied to the object to be ground having the profile design.
For example, as shown in fig. 4, 5, and 6, the number of the convex portions 10 may be provided in plural in the same grinding tool 1. The plurality of protrusions 10 are provided at intervals in the axial direction of the grinding tool 1. In the use process of the grinding cutter 1, after a certain boss 10 is used for a certain number of times, other bosses 10 can be replaced for grinding, so that the condition that the grinding surface is abraded when a single boss 10 is used too much is improved, and the service life of the grinding cutter is prolonged.
The embodiment of the invention also provides a grinding method for the display panel, which can be carried out by matching the grinding cutter 1 shown in fig. 4. In designing the size of the convex portion 10 on the grinding tool 1, in the direction of the axis 100 of the grinding tool 1, as shown in fig. 6 and 7, the embodiment of the present invention may design the length a of the convex portion 10 to be smaller than the thickness T1 of the display panel to be ground. The length a of the protrusion 10 is the dimension of the grinding surface (i.e., the surface of the protrusion 10 away from the grinding tool 1) along the axis 100 of the grinding tool 1.
As shown in fig. 6, 7 and 8, fig. 8 is a schematic flow chart of a polishing method according to an embodiment of the present invention, the polishing method includes:
step S1: the convex part 10 of the grinding tool 1 is attached to the preset area Q of the display panel 2 to be ground. Illustratively, as shown in fig. 7, the display panel 2 to be grinded includes a first surface 210, a second surface 220, and a side surface 20. The first surface 210 and the second surface 220 are disposed opposite to each other in the thickness direction of the display panel 2 to be ground. The side surfaces 20 intersect the first surface 210 and the second surface 220, respectively. As shown in fig. 9, fig. 9 is a schematic view of the side surface 20 of the display panel 2 to be polished in fig. 7, and the predetermined area Q is located on the side surface 20 of the display panel 2 to be polished. The shortest distance between the edge of the predetermined region Q close to the first surface 210 and the first surface 210 of the display panel 2 to be polished is a first predetermined distance D1, the distance between the edge of the predetermined region Q close to the second surface 220 and the second surface 220 of the display panel 2 to be polished is a second predetermined distance D2, and both the first predetermined distance D1 and the second predetermined distance D2 are greater than 0.
Step S2: the predetermined region Q is ground using the boss 10.
In the grinding method for the display panel provided by the embodiment of the invention, during grinding, the protruding part 10 is attached to the preset area of the side surface 20 (i.e. the surface to be ground) of the display panel to be ground, the length of the protruding part 10 of the grinding tool 1 can be designed according to the thickness of the display panel 2 to be ground, and the length of the protruding part 10 of the grinding tool 1 is smaller than the thickness of the display panel 2 to be ground, so that in the grinding process, the protruding part 10 of the grinding tool 1 is prevented from contacting the first surface 210 and the second surface 220 with higher stress in the display panel 2 to be ground, that is, the grinding tool 1 is prevented from avoiding the relatively fragile edge part in the display panel 2 to be ground, further, the display panel 2 to be ground is prevented from generating defects such as edge breakage in the grinding process, and the strength of the display panel after grinding is improved
Moreover, even if the display panel has a step difference in the cutting process before the grinding process, when the display panel is ground by adopting the grinding method provided by the embodiment of the invention, the fragile edge position on the side protruding from the surface to be ground of the display panel is avoided, and the fragile edge position can be prevented from being damaged under the condition of removing the cutting burr, so that the strength of the ground display panel is ensured.
Illustratively, as shown in fig. 6, the grinding of the preset region Q using the protrusion 10 in step S2 includes: the grinding tool 1 is rotated around the axis 100 of the grinding tool 1, and under the rotation, the protrusion 10 and the predetermined area Q are relatively displaced, so that the protrusion 10 grinds the side surface of the display panel 2 to be ground.
Illustratively, as shown in fig. 10, fig. 10 is a schematic diagram of cutting a large plate to form a small-sized display panel, and the display panel 2 to be ground is cut along a cutting line 50 through the large plate 5 to be cut. Optionally, when cutting is performed, the distance between two adjacent small-sized display panels may be set as small as possible, so as to improve the utilization rate of the large panel.
The cut display panel enters a grinding process, as shown in fig. 7 and 9, the display panel 2 to be ground includes a first substrate 21 and a second substrate 22 oppositely disposed along the thickness direction of the display panel to be ground; the surface of the first substrate 21 away from the second substrate 22 is a first surface 210, and the surface of the second substrate 22 away from the first substrate 21 is a second surface 220.
The first substrate 21 includes first microcracks 31. The first microcracks 31 extend from the first surface 210 in a direction close to the second substrate 22. The first predetermined distance D1 is the length of the first microcrack 31.
The second substrate 22 includes second microcracks 32. The second microcracks 32 extend from the second surface 220 in a direction close to the first substrate 21. The second predetermined distance D2 is the length of the second microcrack 32.
The length a of the convex portion 10 in the grinding tool provided by the embodiment of the invention along the axis 100 direction of the grinding tool 1 satisfies: a is less than or equal to T1-T21-T22. Wherein, T1 is the thickness of the display panel to be polished, T21 is the length of the first microcrack 31, and T22 is the length of the second microcrack 32. According to the embodiment of the invention, the length of the protruding part 10 is designed according to the lengths of the first microcrack and the second microcrack, so that the protruding part 10 can avoid the microcracks in the first substrate 21 and the second substrate 22 of the display panel 2 to be polished while the cutting burrs are removed by polishing, that is, the structure of the first microcrack 31 and the second microcrack 32 is prevented from being damaged, the integrity of the first microcrack 31 and the second microcrack 32 is maintained, the display panel 2 to be polished is prevented from generating defects such as edge breakage in the polishing process, and the strength of the display panel after polishing is improved.
In the above-mentioned design of the length of the protruding portion 10, the error of the polishing process can be taken into consideration, and the error of the polishing process dimension is taken as σ, in this case, the length a of the protruding portion 10 can be designed to satisfy a requirement of a ═ T1-T21-T22- σ, so that the area of the polishing surface can be increased as much as possible and the polishing efficiency can be improved within the allowable range of the process error under the premise of avoiding the protruding portion 10 from contacting the microcrack structure of the display panel 2 to be polished. Illustratively, the lapping process size error σ may be 100 μm.
Illustratively, the length T21 of the first microcrack 31 and the thickness T01 of the first substrate 21 satisfy: 0.1T01 is not less than T21 is not less than 0.15T01, and the length T22 of the second microcrack 32 and the thickness T02 of the second substrate 22 meet the following conditions: 0.1T 02-T22-0.15T 02 to make the first microcrack 31 and the second microcrack 32 extend towards each other under the action of proper external force to form a through crack in the large plate, thereby facilitating the separation operation of the large plate.
Alternatively, as shown in fig. 4, 5 and 6, the number of the projections 10 may be plural. The plurality of protrusions 10 are provided at intervals in the direction of the axis 100 of the grinding tool 1. Based on this structure, the polishing method provided by the embodiment of the present invention further includes: after the grinding frequency of one of the protruding portions 10 reaches a predetermined frequency, the grinding tool 1 is moved along the axis 100 direction of the grinding tool 1, and the other protruding portion 10 is attached to the preset region Q of the display panel 2 to be ground to grind the display panel, so that the condition of excessive wear of the grinding surface caused by the use of the single protruding portion 10 is improved, and the service life of the grinding tool is prolonged.
Fig. 11 is a schematic view of a display panel according to an embodiment of the present invention, where the display panel is formed by grinding using the above grinding method, and the display panel includes an encapsulation adhesive 4 surrounding a display area AA of the display panel, and the encapsulation adhesive 4 is located between a first substrate and a second substrate of the display panel. The edge of the encapsulating adhesive 4 is flush with the edge of the display panel. The encapsulating adhesive 4 may be, for example, a frit (frit). The frit contains a laser-absorbing material, and becomes a molten state after absorbing laser light, thereby achieving good adhesion between the first substrate 21 and the second substrate 22 of the display panel.
According to the display panel provided by the embodiment of the invention, the edge of the packaging adhesive 4 is flush with the edge of the display panel, namely, when the display panel with the required size is formed by cutting the large panel, the cutting line can pass through the packaging adhesive 4, the large panel is cut by adopting a cut on cut cutting mode to form the display panel with the required size, the frame size of the display panel can be reduced, the narrow frame design of the display panel is facilitated, the screen occupation ratio of the display panel is improved, in the panel cutting process, the stress can concentrate to the packaging adhesive, the packaging adhesive 4 can be caused to overflow the edge of the display panel, and residues can be generated after cutting. In addition, in the manufacturing process of the display panel, by adopting the grinding tool and the grinding method, the screen occupation ratio is improved, and meanwhile, the edge of the display panel can be prevented from being damaged, so that the strength of the display panel is ensured.
The inventors of the present invention performed a four-point bending test on a display panel obtained by polishing with a straight rod type polishing tool (as sample one) and a display panel obtained by polishing with a polishing tool having a convex portion 10 shown in fig. 4 (as sample two), and after burrs on the cut surfaces were completely removed by polishing, the bending strength of the test sample one was 128.2MPa and the bending strength of the test sample two was 223.9 MPa. Further verifies that the strength of the display panel prepared by the grinding cutter and the grinding method provided by the embodiment of the invention is greatly improved.
As shown in fig. 12, fig. 12 is a schematic view of a display device according to an embodiment of the present invention, where the display device includes the display panel 200. The specific structure of the display panel 200 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 12 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An abrasive tool, comprising:
the convex bulge along first direction, the bulge is used for treating to grind the display panel and grinds, first direction is the perpendicular to the direction of grinding tool's axis.
2. The grinding tool of claim 1,
the cross section of the bulge part along the axis passing through the grinding cutter is trapezoidal, and the length of the bottom edge of the trapezoid far away from the grinding cutter is smaller than the length of the bottom edge of the trapezoid close to the grinding cutter;
the included angle theta between the trapezoid waist and the axis of the grinding tool satisfies the following conditions: theta is more than or equal to 30 degrees and less than or equal to 45 degrees.
3. The grinding tool of claim 1,
the number of the convex parts is multiple; the plurality of protrusions are provided at intervals in the axial direction of the grinding tool.
4. A grinding method for a display panel, characterized in that the grinding tool of any one of claims 1-3 is adopted, and the length of the convex part is smaller than the thickness of the display panel to be ground along the axial direction of the grinding tool; the grinding method comprises the following steps:
attaching the bulge part of the grinding cutter to a preset area of the display panel to be ground;
the display panel to be ground comprises a first surface, a second surface and a side surface; the first surface and the second surface are oppositely arranged along the thickness direction of the display panel to be ground; the side surfaces intersect the first surface and the second surface, respectively; the preset area is positioned on the side surface of the display panel to be ground; the shortest distance between the edge of the preset area close to the first surface and the first surface of the display panel to be ground is a first preset distance, the distance between the edge of the preset area close to the second surface and the second surface of the display panel to be ground is a second preset distance, and the first preset distance and the second preset distance are greater than 0;
and grinding the preset area by using the bulge.
5. The grinding method according to claim 4,
grinding the predetermined area using the protrusion, including:
and rotating the grinding cutter by taking the axis of the grinding cutter as a shaft to enable the boss and the preset area to generate relative displacement.
6. The grinding method according to claim 4,
the display panel to be ground is formed by cutting a large panel to be cut, and comprises a first substrate and a second substrate which are oppositely arranged along the thickness direction of the display panel to be ground; the surface of the first substrate far away from the second substrate is the first surface, and the surface of the second substrate far away from the first substrate is the second surface;
the first substrate includes first microcracks; the first microcracks extend from the first surface in a direction close to the second substrate; the first preset distance is the length of the first microcrack;
the second substrate includes second microcracks; the second microcracks extend from the second surface in a direction close to the first substrate; the second preset distance is the length of the second microcrack;
along the axis direction of the grinding tool, the length A of the bulge satisfies: a is less than or equal to T1-T21-T22；
Wherein, T1For the thickness of the display panel to be ground, T21Length of the first microcracks, T22The length of the second microcrack.
7. The grinding method according to claim 6,
a length T of the first microcrack21And a thickness T of the first substrate01Satisfies the following conditions:
0.1T01≤T21≤0.15T01；
a length T of the second microcrack22Thickness T of the second substrate02Satisfies the following conditions:
0.1T02≤T22≤0.15T02。
8. the grinding method according to claim 4,
the number of the convex parts is multiple; the plurality of the convex parts are arranged at intervals along the axial direction of the grinding cutter;
the grinding method further comprises:
and after the grinding times of one of the convex parts reach the preset times, moving the grinding cutter along the axis direction of the grinding cutter to enable the other convex part to be attached to the preset area.
9. A display panel formed by grinding according to the grinding method of any one of claims 4 to 8, the display panel comprising an encapsulation adhesive surrounding a display area of the display panel,
the edge of the packaging adhesive is flush with the edge of the display panel.
10. A display device comprising the display panel of claim 9.
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