Display device and cover plate structure thereof, and preparation method of ink layer on structure
By using pad printing to prepare the ink layer, the problem of poor printing on the optical blind holes of the cover plate structure was solved, and an ink layer with high coverage and fine edges was achieved, thus improving the printing quality of the cover plate structure.
Patent Information
- Application Number
- CN202511375172.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2025-11-21
AI Technical Summary
In the existing technology, the printing of optical blind holes on the cover plate structure has problems such as insufficient ink, non-circular printed camera holes, deformation and serrations, and it is especially difficult to achieve high-quality ink layer printing on small-sized optical blind holes.
The ink layer is prepared using a pad printing process. A silicone pad printing head with a Shore hardness of 38HC to 48HC is used. The etching depth is 12μm to 20μm, and the pad printing ink particle size is 3μm to 8μm. The ink layer is prepared by pad printing equipment, including steps such as pad printing ink cup scraping, ink picking, hot air surface drying, and transfer. The pressing speed is controlled at 2mm/s to 10mm/s to ensure the ink layer coverage and edge accuracy.
It achieves high coverage and fine edges on the optical blind hole printing surface, solves appearance defects such as ink shortage, jagged edges and non-round edges, and improves the quality of the ink layer.
Smart Images
Figure CN121001285A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of display, in particular, to a display device and a cover plate structure thereof, and a preparation method of a structural ink layer. BACKGROUND
[0002] The printing process in the related art is used to print ink on the printing surface of the optical blind hole on the cover plate structure, which has the problems of ink shortage, jagged appearance, and non-circular and deformed camera hole.
[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY
[0004] The present disclosure aims to overcome the shortcomings of the prior art, and provides a display device and a cover plate structure thereof, and a preparation method of a structural ink layer, which can improve the quality of the ink layer and reduce the problems of ink shortage, non-circular and deformed camera hole, and jagged appearance.
[0005] According to one aspect of the present disclosure, a cover plate structure of a display device is provided, comprising:
[0006] an optical blind hole having a bottom surface and a printing surface, a first edge of the printing surface being connected to a first end surface of the cover plate structure, a second edge of the printing surface being connected to the bottom surface, a radius of the first edge of the printing surface being not less than a radius of the second edge of the printing surface;
[0007] an ink layer arranged at least at the printing surface, and a coverage area of the ink layer on the printing surface being not less than 90% of an area of the printing surface.
[0008] In an embodiment of the present disclosure, the ink layer completely covers the printing surface.
[0009] In an embodiment of the present disclosure, the ink layer has a third edge close to the first edge and a fourth edge close to the second edge, and a line accuracy of the third edge and the fourth edge is not greater than 10 μm.
[0010] In an embodiment of the present disclosure, the cover plate structure is a glass cover plate structure.
[0011] The cover plate structure has a planar region, and the optical blind hole is arranged in the planar region.
[0012] In an embodiment of the present disclosure, a depth of the optical blind hole is 0.05 mm to 0.2 mm.
[0013] The inclination angle of the printing surface is 30°-90°;
[0014] The radius of the first edge is 0.05mm-0.1mm;
[0015] The radius of the second edge is 0.05mm-0.1mm.
[0016] In an embodiment of the present disclosure, the radius of the first edge is greater than the radius of the second edge.
[0017] In an embodiment of the present disclosure, the ink layer is formed on the printing surface by pad printing process.
[0018] According to another aspect of the present disclosure, a display device is provided, having a display panel and the cover plate structure as described above;
[0019] The display panel has optical devices, the optical blind hole of the cover plate structure is towards the display panel, and is arranged correspondingly.
[0020] According to another aspect of the present disclosure, a preparation method of ink layer on a cover plate structure is provided, the preparation of the ink layer is performed by pad printing equipment, the silicone pad printing rubber head of the pad printing equipment has a Shore hardness of 38HC-48HC, the etching plate of the pad printing equipment has a depth of 12μm-20μm, and the particle size of the pad printing ink is 3μm-8μm;
[0021] The preparation method comprises:
[0022] The pad printing ink cup is scraped;
[0023] The pad printing rubber head is inked;
[0024] The pad printing rubber head is air dried, and the air drying time of the pad printing rubber head is 0.5s-4s;
[0025] The pad printing rubber head is transferred, and the pressing speed of the pad printing rubber head is 2mm / s-10mm / s during the transferring;
[0026] Drying is performed to form the ink layer.
[0027] In an embodiment of the present disclosure, the pad printing rubber head is a silicone pad printing rubber head with a Shore hardness of 45HC, the etching plate of the pad printing equipment has a depth of 14μm, the particle size of the pad printing ink is 5μm, the air drying time of the pad printing rubber head is 2s, and the pressing speed of the pad printing rubber head is 5mm / s.
[0028] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0029] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, further serve to explain the principles of the present disclosure. It is apparent that the drawing in the following description merely show some embodiments of the present disclosure and, to one of ordinary skill in the art, other drawings can be obtained from these drawings without any creative work.
[0030] Figure 1 For an embodiment of the present disclosure, a structural schematic diagram of a display device.
[0031] Figure 2 For an embodiment of the present disclosure, a structural schematic diagram of a cover plate structure.
[0032] Figure 3 For an embodiment of the present disclosure, a structural schematic diagram of a cover plate structure.
[0033] Figure 4 For Figure 3 An enlarged view of F in FIG. 4.
[0034] Figure 5 For an embodiment of the present disclosure, a structural schematic diagram of an optical blind hole.
[0035] Figure 6 For an embodiment of the present disclosure, a structural schematic diagram of an optical blind hole.
[0036] Figure 7 For an embodiment of the present disclosure, a schematic diagram of forming an ink scraping pattern of an oil cup.
[0037] Figure 8 For an embodiment of the present disclosure, a schematic diagram of forming an ink scraping pattern of a pad printing rubber head.
[0038] Figure 9 For an embodiment of the present disclosure, a schematic diagram of air-drying of a pad printing rubber head.
[0039] Figure 10 For an embodiment of the present disclosure, a schematic diagram of transferring an optical blind hole by a pad printing rubber head.
[0040] Figure 11 For an embodiment of the present disclosure, an enlarged view of L of a cover plate structure after pad printing. DETAILED DESCRIPTION
[0041] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the description and drawings. Additionally, the drawings are merely schematic and are not drawn to scale.
[0042] Although relative terms such as "upper," "lower," are used herein to describe one component's relationship to another component of a figure, such terminology is used herein for convenience only and is not intended to limit the scope of the disclosure to only a particular orientation. It is to be understood that, if a figure's device were turned over such that its upper portion is now a lower portion, the described component that was "upper" would now be "lower." When a structure is "on" another structure, it can mean that the structure is formed integrally with the other structure or that the structure is "directly" on the other structure or that the structure is "indirectly" on the other structure via another structure.
[0043] The terms "a," "an," "the" and "said" are used to refer to one or more than one (i.e., to "at least one") of the referenced constituent(s) / component(s) / etc.; the terms "comprising" and "having" are used to mean "including" and are open- ended, i.e., not restricted to the listed constituent(s) / component(s) / etc.; the term "first," "second," and the like are used merely as labels, and are not meant to impose numerical requirements on their objects.
[0044] The present disclosure provides a display device, which can be any product or component having a real function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, etc.
[0045] In an embodiment of the present disclosure, referring to Figure 1 , the display device includes a display panel PNL and a cover structure GB. The display panel PNL has an optical device, which can be at least one of a camera, an optical sensor, etc. The cover structure GB is disposed on the light-out side of the display panel PNL to protect the display panel PNL.
[0046] In an embodiment of the present disclosure, referring to Figure 2 and Figure 3The cover plate structure GB has an optical blind hole MQ, which is arranged towards the display panel PNL and corresponds to the optical device on the display panel PNL. It can be understood that the cover plate structure GB has a first end surface K1 and a second end surface K2, and the cover plate structure GB is provided with the optical blind hole MQ extending from the first end surface K1 to the second end surface K2. The blind hole in the present disclosure refers to a hole structure recessed on the cover plate structure GB and not completely penetrating the cover plate structure GB.
[0047] In an embodiment of the present disclosure, referring to Figure 3 The cover plate structure GB has a planar area, and the optical blind hole MQ is arranged on the planar area.
[0048] In an embodiment of the present disclosure, referring to Figure 2 The optical blind hole MQ is circular.
[0049] In an embodiment of the present disclosure, referring to Figure 4 , Figure 5 and Figure 6 The optical blind hole MQ has a bottom surface Q1 and a printing surface Q2. The printing surface Q2 has a first edge BL1 and a second edge BL2, the second edge BL2 is connected to the bottom surface Q1, and the first edge BL1 is connected to the first end surface K1 of the cover plate structure GB.
[0050] In an embodiment of the present disclosure, the depth of the optical blind hole MQ is 0.05mm-0.2mm. For example, the depth of the optical blind hole MQ is 0.05mm, 0.06mm, 0.078mm, 0.1mm, 0.135mm, 0.186mm, 0.2mm, etc. In the present disclosure, the depth of the optical blind hole MQ refers to the vertical distance between the bottom surface Q1 of the optical blind hole MQ and the first end surface K1 of the cover plate structure GB.
[0051] In an embodiment of the present disclosure, the radius of the first edge BL1 of the printing surface Q2 is 0.05mm-0.1mm, the radius of the second edge BL2 of the printing surface Q2 is 0.05mm-0.1mm, and the radius of the first edge BL1 is not less than the radius of the second edge BL2. For example, the radius of the first edge BL1 is 0.05mm, and the radius of the second edge BL2 is 0.05mm. For another example, the radius of the first edge BL1 is 0.06mm, and the radius of the second edge BL2 is 0.05mm. For another example, the radius of the first edge BL1 is 0.065mm, and the radius of the second edge BL2 is 0.055mm. For another example, the radius of the first edge BL1 is 0.076mm, and the radius of the second edge BL2 is 0.068mm. For another example, the radius of the first edge BL1 is 0.1mm, and the radius of the second edge BL2 is 0.086mm. For another example, the radius of the first edge BL1 is 0.1mm, and the radius of the second edge BL2 is 0.1mm.
[0052] In an embodiment of the present disclosure, referring to Figure 5 , the inclination angle A of the printing surface Q2 is 30°-90°. For example, the inclination angle A of the printing surface Q2 is 30°, 40°, 50°, 60°, 75°, 80°, 90°, etc. When the inclination angle A of the printing surface Q2 is 90°, the printing surface Q2 is perpendicular to the bottom surface Q1. In an example, the inclination angle A of the printing surface Q2 is less than 90°. In the example, the inclination angle A of the printing surface Q2 refers to the included angle between the printing surface Q2 and the extension line of the bottom surface Q1.
[0053] In an embodiment of the present disclosure, the cover plate structure GB is a glass cover plate structure.
[0054] Referring to Figure 11 , the printing surface Q2 of the optical blind hole MQ needs to print an ink layer INK to achieve the effect of light shielding, and the ink layer INK needs to extend to part of the area of the first end surface K1 of the cover plate structure GB and the bottom surface Q1.
[0055] In the related art, one is to use a silk screen printing (the characteristics of silk screen printing ink are slow drying or super slow drying type, the purpose is to make the ink not easy to evaporate quickly when used in the silk screen printing screen to maintain good fluidity to ensure the printing quality; when the on-line viscosity of the silk screen printing ink is 3500mPa.s, the surface film layer of the ink on the screen printing to the printed matter generally has a surface drying evaporation speed of more than 60 seconds (operation environment temperature 20-25℃)) to prepare the optical blind hole side ink layer, but the silk screen printing is more suitable for flat and regular printing surface, and is not suitable for the product shape with concave and convex structure (the cover plate structure has an optical blind hole). When the target printing area is the concave bottom, the printed product produced by the silk screen printing method has pattern ink shortage, serration, and non-round camera hole, etc. The defect rate reaches 100%.
[0056] Secondly, 3D curved surface pad printing is used (pad printing is a printing method in which ink is transferred from a printing plate to a workpiece using a silicone pad). Pad printing ink is characterized by being medium-dry or medium-fast-drying, the purpose of which is to ensure that the ink has a fast and good film-forming ability when picked up from the etched steel plate and transferred to the workpiece surface using the pad printing head, facilitating transfer printing; when the upper linear viscosity of the pad printing ink is 3500 mPa·s, the surface drying and evaporation rate of the ink film layer picked up from the etched steel plate and pressed onto the workpiece is generally within 10 seconds (operating ambient temperature 2). The ink layer for optical blind holes is prepared using a method of 0~25℃. However, 3D curved surface pad printing technology is more suitable for printing graphics on general curved surfaces. For small-sized optical blind holes on the cover plate structure, the pad printing head cannot effectively press the pad printing ink onto the inner side of the optical blind hole printing surface (i.e., the side connected to the bottom surface). If pad printing is forced, the resulting ink layer will have problems such as insufficient ink, jagged edges, light transmission, and deformed round holes compared to the printing surface. It may even affect the assembly of optical components of the display panel.
[0057] To address the aforementioned issues, in the first embodiment, processes such as spraying, exposure, and development can be used to prepare the ink layer INK on the cover plate structure GB.
[0058] In a second embodiment, this disclosure provides a novel method for preparing an ink layer INK, which employs a pad printing process to prepare the ink layer INK.
[0059] The preparation method employs a pad printing device. In this disclosure, the pad printing device uses a silicone pad printing head PAD with a Shore hardness of 38HC to 48HC, the etching depth is 12μm-20μm, and the particle size of the pad printing ink is 3μm-8μm.
[0060] The preparation method includes:
[0061] See Figure 7 YZ pad printing ink cup;
[0062] See Figure 8 The pad printing head (PAD) picks up ink.
[0063] See Figure 9 The pad printing pad (PAD) is then dried with hot air. This step can be performed using a hot air dryer (HG). The drying time for the pad printing pad (PAD) is 0.5s-4s.
[0064] See Figure 10 The pad printing head PAD is used for transfer printing. In this step, the downward pressure speed of the pad printing head PAD is 2mm / s-10mm / s.
[0065] Drying, forming an ink layer INK, the structure of the ink layer INK is shown in Figure 11 .
[0066] By using the method in the present disclosure, printing of the small-size optical blind hole is realized, and based on the structural characteristics of the optical blind hole MQ (such as the depth of the optical blind hole MQ, the inclination angle of the printing surface Q2 of the optical blind hole MQ, the radius of the first edge BL1 and the second edge BL2, and other parameters), the related parameters of the pad printing equipment and the preparation process (each parameter needs to meet the above corresponding conditions at the same time) are set in a targeted manner. Within the parameter range, better printing of the printing surface Q2 of the optical blind hole MQ can be realized, and the coverage of the ink layer INK on the printing surface Q2 is increased.
[0067] The preparation method in the present disclosure only gives the steps related to the key innovation points, and other steps required by the pad printing process are not given, such as pressure maintaining of the pad printing rubber head PAD and separation of the pad printing rubber head PAD.
[0068] In an embodiment of the present disclosure, under the pad printing process, more than 90% of the printing surface Q2 of the optical blind hole MQ is covered by the ink layer INK. In an example, 100% of the printing surface Q2 of the optical blind hole MQ is covered by the ink layer INK, so that the problem of ink shortage is completely solved.
[0069] Optionally, under the pad printing process, the ink layer INK has a third edge BL3 close to the first edge BL1 and a fourth edge BL4 close to the second edge BL2, and the line precision of the third edge BL3 and the fourth edge BL4 is not greater than 10 μm. For example, the line precision is 10 μm, 9 μm, 8 μm, 6 μm, 4 μm, 2 μm, etc. In the present disclosure, the line precision refers to the maximum distance between the wave crest and the wave trough of the third edge BL3 (or the fourth edge BL4). It can be understood that the maximum distance between the wave crest and the wave trough is not greater than 10 μm.
[0070] The ink layer INK prepared by using the preparation method in the present disclosure increases the coverage area of the ink layer INK on the printing surface Q2 and the line precision of the edge of the ink layer INK, and solves the problems of ink shortage, light transmission, jagged appearance, and non-circular and deformed edge of the ink layer INK after printing.
[0071] In an embodiment of the present disclosure, the pad printing rubber head PAD is a silica gel pad printing rubber head with a Shore hardness of 38 HC, the depth of the etching plate is 14 μm, and the particle size of the pad printing ink is 5 μm; the hot air surface drying time of the pad printing rubber head PAD is 0.5 s; and the pressing speed of the pad printing rubber head PAD is 7 mm / s.
[0072] In another embodiment of the present disclosure, the stamping rubber head PAD is a silicone stamping rubber head with a Shore hardness of 43 HC, the etching plate has a depth of 12 μm, and the particle size of the stamping ink is 3 μm; the air-drying time of the stamping rubber head PAD is 2.5 s; and the pressing speed of the stamping rubber head PAD is 2 mm / s.
[0073] In another embodiment of the present disclosure, the stamping rubber head PAD is a silicone stamping rubber head with a Shore hardness of 48 HC, the etching plate has a depth of 20 μm, and the particle size of the stamping ink is 8 μm; the air-drying time of the stamping rubber head PAD is 4 s; and the pressing speed of the stamping rubber head PAD is 10 mm / s.
[0074] In another embodiment of the present disclosure, the stamping rubber head PAD is a silicone stamping rubber head with a Shore hardness of 46 HC, the etching plate has a depth of 17 μm, and the particle size of the stamping ink is 6 μm; the air-drying time of the stamping rubber head PAD is 3.67 s; and the pressing speed of the stamping rubber head PAD is 8.9 mm / s.
[0075] In another embodiment of the present disclosure, the stamping rubber head PAD is a silicone stamping rubber head with a Shore hardness of 40 HC, the etching plate has a depth of 19 μm, and the particle size of the stamping ink is 4 μm; the air-drying time of the stamping rubber head PAD is 1.6 s; and the pressing speed of the stamping rubber head PAD is 2.5 mm / s.
[0076] In another embodiment of the present disclosure, the stamping rubber head PAD is a silicone stamping rubber head with a Shore hardness of 45 HC, the etching plate of the stamping device has a depth of 14 μm, the particle size of the stamping ink is 5 μm, the air-drying time of the stamping rubber head PAD is 2 s; and the pressing speed of the stamping rubber head PAD is 5 mm / s.
[0077] In another embodiment of the present disclosure, the stamping rubber head PAD is a silicone stamping rubber head with a Shore hardness of 45 HC, the etching plate of the stamping device has a depth of 14 μm, the particle size of the stamping ink is 5 μm, the air-drying time of the stamping rubber head PAD is 2 s; and the pressing speed of the stamping rubber head PAD is 5 mm / s.
[0078] In this embodiment, the positioning accuracy of the printing jig of the stamping device is ±0.03 mm.
[0079] In an embodiment of the present disclosure, before the stamping process, the cover plate structure GB is cleaned by flat plate cleaning or ultrasonic cleaning to ensure the cleanliness of the cover plate structure GB.
[0080] In an embodiment of the present disclosure, the ink layer INK extends to part of the first end surface K1 of the cover plate structure GB and part of the bottom surface Q1 of the optical blind hole MQ, so as to achieve a better shielding effect.
[0081] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims
1. A cover plate structure for a display device, characterized in that, include: An optical blind aperture has a bottom surface and a printed surface. A first edge of the printed surface is connected to a first end face of the cover plate structure, and a second edge of the printed surface is connected to the bottom surface. The radius of the first edge of the printed surface is not less than the radius of the second edge of the printed surface. An ink layer is disposed at least on the printed surface, and the area covered by the ink layer on the printed surface is not less than 90% of the area of the printed surface.
2. The cover plate structure of the display device according to claim 1, characterized in that, The ink layer completely covers the printed surface.
3. The cover plate structure of the display device according to claim 2, characterized in that, The ink layer has a third edge near the first edge and a fourth edge near the second edge, and the line accuracy of the third edge and the fourth edge is no greater than 10 μm.
4. The cover plate structure of the display device according to claim 3, characterized in that, The cover plate structure is a glass cover plate structure; The cover plate structure has a planar area, and the optical blind hole is disposed in the planar area.
5. The cover plate structure of the display device according to claim 4, characterized in that, The depth of the optical blind hole is 0.05 mm to 0.2 mm; The tilt angle of the printed surface is 30° to 90°; The radius of the first edge is 0.05mm-0.1mm; The radius of the second edge is 0.05mm-0.1mm.
6. The cover plate structure of the display device according to claim 5, characterized in that, The radius of the first edge is greater than the radius of the second edge.
7. The cover plate structure of the display device according to any one of claims 1-6, characterized in that, The ink layer is formed on the printing surface using a pad printing process.
8. A display device, characterized in that, It has a display panel and a cover plate structure as described in any one of claims 1-7; The display panel has optical components, and the optical blind hole of the cover plate structure faces the display panel and is set accordingly.
9. A method for preparing an ink layer on a cover plate structure, characterized in that, The ink layer is prepared using a pad printing device. The pad printing head of the pad printing device is a silicone pad printing head with a Shore hardness of 38HC to 48HC. The etching depth of the etching plate of the pad printing device is 12μm-20μm, and the particle size of the pad printing ink is 3μm-8μm. The preparation method includes: Pad printing ink cup scraper; Ink is picked up by the pad printing ink head; The pad printing head is dried by hot air, and the drying time of the pad printing head by hot air is 0.5s-4s; The pad printing head transfers ink, and during the transfer process, the downward pressure speed of the pad printing head is 2mm / s-10mm / s; Drying forms an ink layer.
10. The method for preparing the ink layer on the cover plate structure according to claim 9, characterized in that, The pad printing head is a silicone pad printing head with a Shore hardness of 45HC. The etching depth of the pad printing equipment is 14μm. The particle size of the pad printing ink is 5μm. The hot air surface drying time of the pad printing head is 2s. The downward pressure speed of the pad printing head is 5mm / s.