CN114360393A - Preparation method of special-shaped screen - Google Patents
Preparation method of special-shaped screen Download PDFInfo
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- CN114360393A CN114360393A CN202011099125.6A CN202011099125A CN114360393A CN 114360393 A CN114360393 A CN 114360393A CN 202011099125 A CN202011099125 A CN 202011099125A CN 114360393 A CN114360393 A CN 114360393A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000003292 glue Substances 0.000 claims abstract description 116
- 239000006059 cover glass Substances 0.000 claims abstract description 74
- 239000011521 glass Substances 0.000 claims abstract description 48
- 238000005520 cutting process Methods 0.000 claims abstract description 43
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 238000000576 coating method Methods 0.000 claims abstract description 33
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 5
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 36
- 238000007650 screen-printing Methods 0.000 claims description 16
- 238000000149 argon plasma sintering Methods 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 4
- 238000010023 transfer printing Methods 0.000 claims description 4
- 238000003776 cleavage reaction Methods 0.000 claims 1
- 230000007017 scission Effects 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 230000010355 oscillation Effects 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 229920001621 AMOLED Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000011120 plywood Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- -1 alkyl Alcohol Ether Carboxylate Chemical class 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention relates to a preparation method of a special-shaped screen, which comprises the following steps: (1) coating first glue on an area to be removed of the upper cover glass, coating second glue on the edge of a display area of the upper cover glass, and reserving a gap between the first glue and the second glue to obtain the glued upper cover glass; (2) and packaging the upper cover glass and the lower cover glass after gluing, and then cutting along a gap between the first glue and the second glue to obtain the special-shaped screen. According to the invention, the step of coating the first glue on the area of the upper cover glass which needs to be removed by cutting is added before the upper cover glass and the lower cover glass are packaged, so that the adhesive force between the upper glass and the lower glass in the area to be removed is increased, and the suspended area is avoided, thereby avoiding the upper glass and the lower glass from being layered due to oscillation generated in the cutting process.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a preparation method of a special-shaped screen.
Background
The development trend of mobile phones is more and more towards a full screen and a camera embedded in a display screen, so that an Active Matrix Organic Light Emitting Diode (AMOLED) screen needs to be developed from an original square screen to a special screen. The special-shaped screen mobile phone is deeply pursued by consumers due to high screen occupation ratio, beautiful and mellow appearance and excellent hand feeling.
Manufacturing an AMOLED screen into a special-shaped screen, performing CNC (computer numerical control) processing on a right angle into a round angle, and performing CNC special-shaped cutting on the screen to avoid the position of a mobile phone camera, as shown in figure 1; because the AMOLED screen is formed by packaging upper and lower glass by glass cement (Frit cement), the Frit material has weak impact resistance, the glass layering phenomenon is easy to occur in the CNC manufacturing process, in order to reduce the glass layering probability, multiple times of processing or laser cutting and other processing procedures are generally needed, the process complexity is increased, and the machine investment and the manufacturing cost are high.
CN108710340A discloses a CNC one-step forming process for a full-face screen cover plate, wherein a full-face screen cover plate product drawing is introduced into CAD/CAM software, the specific process comprises a cutter path, a cutter type, a spindle rotating speed, a path feeding rate, a cutter feeding and retracting parameter and the like, four arc edges of the full-face screen cover plate are designed into long arcs and short arcs, namely the arc edge of a receiver hole end is short, and other arc edges are long. However, the CNC process provided by the invention is easy to generate the condition of upper and lower glass delamination, and the product yield is influenced.
CN102385652A discloses a design method of a CNC forming cutter for a special-shaped mobile phone glass screen. And (3) editing the cross section shape of the product by using professional drawing software starting from the cross section shape of the product, and designing a cutter graph used by the glass CNC equipment through various operations by using commands such as copying, offsetting, mirroring, extending, deleting and the like in the CAD software. The design method is suitable for designing the cutter of a product with a special-shaped section shape, and the section shape and the size of the product can be accurately controlled by utilizing the high precision of CNC (computerized numerical control) forming equipment, so that the required complicated product shape can be processed, the appearance design of the product is enriched, and the method has high popularization value. However, when the tool provided by the invention is used for CNC, the upper glass and the lower glass are still separated, so that the product yield is influenced.
CN104261697A discloses a third strengthening process for touch glass of display screen, which comprises: 1) soaking the touch control glass by adopting a pretreatment liquid; the pretreatment liquid comprises ammonium bifluoride, strong acid, pure water and a surfactant, the pH value of the pretreatment liquid is 4-6, and the strong acid is any one or more of concentrated sulfuric acid, concentrated hydrochloric acid and concentrated nitric acid; 2) performing strengthening treatment on the touch glass by adopting the strengthening liquid for three times; the third strengthening liquid comprises: ammonium bifluoride, strong acid, pure water, aluminum silicate and surfactant; the surfactant is a mixture of alkyl Alcohol Ether Carboxylate (AEC) and amino acid. The third strengthening process of the touch glass of the display screen adopts the principle of ion replacement to replace surface molecules in the microcracks generated after CNC machining of the substrate glass, increases the diameter of the molecules in the microcracks, improves the stress capability of the molecules, and has the advantage of good strengthening machining effect. Although the method can solve the problem of micro-cracks, the method does not solve the problem of separation of upper glass and lower glass, and has complex operation process and increased production cost.
Therefore, there is a need in the art to develop a new CNC processing method to solve the separation of the upper and lower glasses, and to simplify the process and reduce the production cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of a special-shaped screen. The preparation method can effectively solve the problem of separation of upper glass and lower glass in the CNC process, and has simple process and low production cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a special-shaped screen, which comprises the following steps:
(1) coating first glue on an area to be removed of the upper cover glass, coating second glue on the edge of a display area of the upper cover glass, and reserving a gap between the first glue and the second glue to obtain the glued upper cover glass;
(2) and packaging the upper cover glass and the lower cover glass after gluing, and then cutting along a gap between the first glue and the second glue to obtain the special-shaped screen.
The invention provides a novel special-shaped screen preparation process, which is characterized in that a step of coating first glue is added in an area of upper cover glass needing to be removed through cutting before the upper cover glass and the lower cover glass are packaged, so that the adhesive force between the upper glass and the lower glass in the area to be removed is increased, and a suspended area is avoided, thereby avoiding the upper glass and the lower glass from being layered due to oscillation generated in the cutting process. In addition, the method can complete all shapes by one-time or two-time cutting, thereby greatly saving the processing time and the cost.
One of the characteristics of the invention is that the first glue is coated to make the cutting into the shapes suitable for different shapes, and the cutting risk is not increased due to the large area of the material to be removed. The present invention is not particularly limited to the shape.
Preferably, in the step (1), the first glue comprises UV glue and/or glass glue.
Preferably, in step (1), the second glue comprises glass cement.
Preferably, in step (1), the coating width of the second glue is more than or equal to 0.1mm, such as 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm and the like.
Preferably, in step (1), the width of the gap between the first glue and the second glue is greater than or equal to 5mm, such as 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, 7mm, 8mm, etc.
The width of the gap is preferably more than or equal to 5mm, and the UV glue can volatilize gas when being heated, so that the upper glass plywood and the lower glass plywood are influenced, and organic materials of a display are influenced.
Preferably, in the step (1), the method for applying the first glue and the method for applying the second glue each independently comprise screen printing.
Preferably, in the step (1), the applying the first glue and the applying the second glue are performed simultaneously by screen printing.
Preferably, the screen printing specifically includes: drawing a transfer printing grid of a target shape on drawing software, and coating the first glue and/or the second glue on a target position by using the transfer printing grid.
Preferably, the screen printing is carried out at an inking speed of 20-40mm/s, such as 22mm/s, 24mm/s, 26mm/s, 28mm/s, 30mm/s, 32mm/s, 34mm/s, 36mm/s, 38mm/s, etc., preferably 30 mm/s.
Preferably, the paste application rate of the screen printing is 80-120mm/s, such as 82mm/s, 84mm/s, 86mm/s, 88mm/s, 90mm/s, 92mm/s, 94mm/s, 96mm/s, 98mm/s, 100mm/s, 110mm/s, 115mm/s, 118mm/s, etc., preferably 100 mm/s.
Preferably, in step (2), the method for encapsulating includes: and pressing the upper cover glass and the lower cover glass after gluing, and then performing laser sintering.
Preferably, after said pressing, the distance between the upper and lower cover glasses is 5-8 μm, such as 5.2 μm, 5.4 μm, 5.6 μm, 5.8 μm, 6 μm, 6.2 μm, 6.4 μm, 6.6 μm, 6.8 μm, 7 μm, 7.2 μm, 7.4 μm, 7.6 μm, 7.8 μm, etc., preferably 6 μm. I.e. the thickness of the first glue and the second glue is 5-8 μm, preferably 6 μm.
Preferably, the power of the laser sintering is 5-10W, such as 6W, 7W, 8W, 9W, etc., preferably 7W.
Preferably, the speed of the laser sintering is 8-12mm/s, such as 8.2mm/s, 8.4mm/s, 8.6mm/s, 8.8mm/s, 9mm/s, 9.2mm/s, 9.4mm/s, 9.6mm/s, 9.8mm/s, 10mm/s, 10.2mm/s, 10.4mm/s, 10.6mm/s, 10.8mm/s, 11mm/s, 11.2mm/s, 11.4mm/s, 11.6mm/s, 11.8mm/s, etc., preferably 10 mm/s.
Preferably, in step (3), the cutting instrument comprises a numerical control cutting (CNC) machine.
Preferably, the cutter of the numerical control cutting machine is circular.
Preferably, the diameter of the circle is 15-25mm, such as 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, etc., preferably 20 mm.
Preferably, the rotating speed of the cutter of the numerical control cutting machine is 25000 and 30000rpm/min, such as 26000rpm/min, 27000rpm/min, 28000rpm/min, 29000rpm/min and the like, preferably 27000 rpm/min.
Preferably, the grinding rate of the numerically controlled cutting machine is 0.8-1.2mm/s, such as 0.9mm/s, 1mm/s, 1.1mm/s, etc., preferably 1 mm/s.
Preferably, in step (3), the number of cuts is one or two.
Preferably, the preparation method specifically comprises the following steps:
(1) coating first glue on an area to be removed of the upper cover glass at an ink covering speed of 20-40mm/s and a glue coating speed of 80-120mm/s by a screen printing method, coating second glue with the width of more than or equal to 0.1mm on the edge of a display area of the upper cover glass, and leaving a gap with the width of more than or equal to 5mm between the first glue and the second glue to obtain the glued upper cover glass;
(2) and pressing the glued upper cover glass and lower cover glass until the distance between the upper cover glass and the lower cover glass is 5-8 mu m, then carrying out laser sintering at the power of 5-10W and the speed of 8-12mm/s, and then cutting along the gap between the first glue and the second glue by using a numerical control cutting machine at the cutter rotating speed of 25000 and 30000rpm/min and the grinding speed of 0.8-1.2mm/s to obtain the special-shaped screen.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a novel special-shaped screen preparation process, which is characterized in that a step of coating first glue is added in an area of upper cover glass needing to be removed through cutting before the upper cover glass and the lower cover glass are packaged, so that the adhesive force between the upper glass and the lower glass in the area to be removed is increased, and a suspended area is avoided, thereby avoiding the upper glass and the lower glass from being layered due to oscillation generated in the cutting process. And the method can complete the whole modeling through one-time or two-time cutting, thereby greatly saving the processing time and the cost.
One of the characteristics of the invention is that the first glue is coated to make the cutting into the shapes suitable for different shapes, and the cutting risk is not increased due to the large area of the material to be removed.
Drawings
Fig. 1 is a schematic diagram of a CNC special-shaped cutting process in the background of the invention.
Fig. 2 is a schematic view of the area of the first glue application in an embodiment of the invention.
Fig. 3 is a schematic view of the area of the first glue application in an embodiment of the invention.
Fig. 4 is a schematic view of the area of the first glue application in an embodiment of the invention.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a preparation method of a special-shaped screen, which specifically comprises the following steps:
(1) coating a first glue (UV glue, purchased from HK/MORESCO, and having a model of UMW90ES701912200049) on an area to be removed of the upper cover glass at an ink coating speed of 30mm/s and a glue coating speed of 100mm/s by a screen printing method, coating a second glue (glass glue, purchased from Asahi glass and having a brand number of TDX9B) with a width of 0.1mm on the edge of a display area of the upper cover glass, and leaving a gap with a width of 5mm between the first glue and the second glue to obtain the glued upper cover glass;
the detailed application region of the first glue is shown in fig. 2, the position of the second glue is not shown in fig. 2, as described above, the second glue is applied on the edge of the display region, and fig. 2 is only for showing the shape of the first glue application region, the size in the figure has no practical meaning, the practical size is based on the description of the words, and the rest of the drawings are similar.
(2) And pressing the glued upper cover glass and lower cover glass until the distance between the upper cover glass and the lower cover glass is 6 microns, then performing laser sintering at the power of 7W and the speed of 10mm/s, and then cutting along the gap between the first glue and the second glue by using a numerical control cutting machine at the rotating speed of a cutter of 27000rpm/min and the grinding speed of 1mm/s to obtain the special-shaped screen.
The cutter of the numerical control cutting machine is a circular grinding head with the diameter of 20 mm.
Example 2
The difference from example 1 is that the coated area of the first glue is shown in figure 3.
Example 3
The difference from example 1 is that the coated area of the first glue is shown in fig. 4, and the first glue is glass glue (available from asahi glass under the designation TDX 9B).
Example 4
The embodiment provides a preparation method of a special-shaped screen, which specifically comprises the following steps:
(1) coating a first glue (UV glue, purchased from HK/MORESCO and having a model of UMW90ES701912200049) on an area to be removed of the upper cover glass at an ink coating speed of 20mm/s and a glue coating speed of 80mm/s by a screen printing method, coating a second glue (glass glue, purchased from Asahi glass and having a brand number of TDX9B) with a width of 0.5mm on the edge of a display area of the upper cover glass, and leaving a gap with a width of 8mm between the first glue and the second glue to obtain the glued upper cover glass;
wherein the area of application of the first glue is detailed in figure 2.
(2) And pressing the glued upper cover glass and lower cover glass until the distance between the upper cover glass and the lower cover glass is 5 microns, then performing laser sintering at the power of 5W and the speed of 8mm/s, and then cutting along the gap between the first glue and the second glue by using a numerical control cutting machine at the rotating speed of a cutter of 25000rpm/min and the grinding speed of 0.8mm/s to obtain the special-shaped screen.
The cutter of the numerical control cutting machine is a circular grinding head with the diameter of 25 mm.
Example 5
The embodiment provides a preparation method of a special-shaped screen, which specifically comprises the following steps:
(1) coating a first glue (UV glue, purchased from HK/MORESCO and having a model of UMW90ES701912200049) on an area to be removed of the upper cover glass at an ink coating speed of 40mm/s and a glue coating speed of 120mm/s by a screen printing method, coating a second glue (glass glue, purchased from Asahi glass and having a brand number of TDX9B) with a width of 0.8mm on the edge of a display area of the upper cover glass, and leaving a gap with a width of 6mm between the first glue and the second glue to obtain the glued upper cover glass;
wherein the area of application of the first glue is detailed in figure 2.
(2) And pressing the glued upper cover glass and lower cover glass until the distance between the upper cover glass and the lower cover glass is 8 mu m, then carrying out laser sintering at the power of 10W and the speed of 12mm/s, and then cutting along the gap between the first glue and the second glue by using a numerical control cutting machine at the rotating speed of a cutter of 30000rpm/min and the grinding speed of 1.2mm/s to obtain the special-shaped screen.
The cutter of the numerical control cutting machine is a circular grinding head with the diameter of 15 mm.
Example 6
The difference from example 1 is that the width of the gap between the first glue and the second glue is 4 mm.
Comparative example 1
The comparative example provides a preparation method of a special-shaped screen, which specifically comprises the following steps:
(1) coating glue (glass glue, available from Asahi glass and available from Asahi glass under the brand name of TDX9B) with the width of 0.1mm at the edge of the display area of the upper cover glass by a screen printing method at the ink covering speed of 30mm/s and the glue coating speed of 100mm/s to obtain the glued upper cover glass;
(2) and pressing the glued upper cover glass and lower cover glass until the distance between the upper cover glass and the lower cover glass is 6 microns, then performing laser sintering at the power of 7W and the speed of 10mm/s, and then cutting along the outer side of the glue by using a numerical control cutting machine at the rotating speed of a cutter of 27000rpm/min and the grinding speed of 1mm/s to obtain the special-shaped screen.
Comparative example 2
The difference from embodiment 1 is that there is no gap between the first glue and the second glue.
Performance testing
The CNC cutting process product yield of the above examples and comparative examples was tested and the results are shown in table 1.
TABLE 1
As can be seen from table 1, the method for manufacturing the irregular screen provided by the present invention can effectively avoid the layering of the upper cover glass and the lower cover glass in the CNC process, and the yield of the product is high.
As is clear from comparison between example 1 and example 6, the product yield can be further improved by controlling the width of the gap between the first glue and the second glue to be 5mm or more.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The preparation method of the special-shaped screen is characterized by comprising the following steps:
(1) coating first glue on an area to be removed of the upper cover glass, coating second glue on the edge of a display area of the upper cover glass, and reserving a gap between the first glue and the second glue to obtain the glued upper cover glass;
(2) and packaging the upper cover glass and the lower cover glass after gluing, and then cutting along a gap between the first glue and the second glue to obtain the special-shaped screen.
2. The preparation method according to claim 1, wherein in the step (1), the first glue comprises UV glue and/or glass glue;
preferably, in step (1), the second glue comprises glass cement.
3. The preparation method according to claim 1 or 2, characterized in that in step (1), the coating width of the second glue is more than or equal to 0.1 mm;
preferably, in the step (1), the width of the gap between the first glue and the second glue is more than or equal to 5 mm.
4. The method according to any one of claims 1 to 3, wherein in step (1), the method of applying the first glue and the method of applying the second glue each independently comprise screen printing;
preferably, in the step (1), the applying of the first glue and the applying of the second glue are performed simultaneously by screen printing;
preferably, the screen printing specifically includes: drawing a transfer printing grid of a target shape on drawing software, and coating the first glue and/or the second glue on a target position by using the transfer printing grid;
preferably, the ink covering speed of the screen printing is 20-40mm/s, preferably 30 mm/s;
preferably, the paste application rate of the screen printing is 80-120mm/s, preferably 100 mm/s.
5. The production method according to any one of claims 1 to 4, wherein in the step (2), the encapsulating method comprises: and pressing the upper cover glass and the lower cover glass after gluing, and then performing laser sintering.
6. The production method according to claim 5, wherein after the press-fitting, the distance between the upper cover glass and the lower cover glass is 5 to 8 μm;
preferably, the power of the laser sintering is 5-10W;
preferably, the speed of the laser sintering is 8-12 mm/s.
7. The method according to any one of claims 1 to 6, wherein in the step (3), the cutting instrument comprises a numerically controlled cutting machine.
8. The manufacturing method according to claim 7, wherein the shape of the cutter of the numerical control cutting machine is circular;
preferably, the diameter of the circle is 15-25mm, preferably 20 mm;
preferably, the rotating speed of the cutter of the numerical control cutting machine is 25000 and 30000rpm/min, preferably 27000 rpm/min;
preferably, the grinding rate of the numerical control cutting machine is 0.8-1.2mm/s, preferably 1 mm/s.
9. The production method according to any one of claims 1 to 8, wherein in step (3), the number of times of the cleavage is one or two.
10. The preparation method according to any one of claims 1 to 9, comprising in particular the steps of:
(1) coating first glue on an area to be removed of the upper cover glass at an ink covering speed of 20-40mm/s and a glue coating speed of 80-120mm/s by a screen printing method, coating second glue with the width of more than or equal to 0.1mm on the edge of a display area of the upper cover glass, and leaving a gap with the width of more than or equal to 5mm between the first glue and the second glue to obtain the glued upper cover glass;
(2) and pressing the glued upper cover glass and lower cover glass until the distance between the upper cover glass and the lower cover glass is 5-8 mu m, then carrying out laser sintering at the power of 5-10W and the speed of 8-12mm/s, and then cutting along the gap between the first glue and the second glue by using a numerical control cutting machine at the cutter rotating speed of 25000 and 30000rpm/min and the grinding speed of 0.8-1.2mm/s to obtain the special-shaped screen.
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