TW201917497A - Electronic device, manufacturing method thereof and smart watch - Google Patents

Abstract

The present invention provides an electronic device (such as a smart watch) including a transparent cover plate, a first ink layer and a second ink layer are provided on a surface of the cover plate. The first ink layer is formed directly on the cover plate. The second ink layer including a decorative pattern and an alignment mark, the decorative pattern is directly formed on the cover plate, the alignment mark covers on the first ink layer. The decorative pattern and the alignment mark of the present invention are formed by a same ink layer in the same printing process, and the deviation of position between the decorative pattern and the alignment mark can be reduced, which increases the alignment accuracy of subsequent elements when they are aligned. The present invention also provides a method of manufacturing the electronic device.

Description

Electronic device, manufacturing method of electronic device, and smart watch

The invention relates to an electronic device (such as a smart watch) and a manufacturing method thereof.

In the existing electronic devices, a display device is taken as an example. With the rise of wearable devices, the rectangular shape in the past cannot meet the needs of users. The wearable device may need to be equipped with a non-rectangular display screen, such as a circular display screen, a regular triangular display screen, a regular pentagonal display screen, a regular hexagonal display screen, and the like.

Generally speaking, during the assembly process of a display device, it is necessary to use a mark to align different components. According to the requirements of the display device, a decorative pattern can be printed on the transparent cover of the display device. Alignment marks on conventional designs are usually formed after forming a decorative pattern and a light-shielding layer. Therefore, there may be a large positional deviation between the decorative pattern and the mark (for example, the angle θ> ± 1 °), which causes the decorative pattern on the cover plate and other elements such as the display panel to be assembled during the display device assembly. There is a large position deviation, which affects the display effect.

In view of this, it is necessary to provide an electronic device with high bit accuracy.

An electronic device includes a transparent cover plate, a first ink layer and a second ink layer are disposed on one surface of the cover plate, and the first ink layer directly covers the cover plate,

The second ink layer includes a decorative pattern and an alignment mark, the decorative pattern directly covers the cover plate, and the alignment mark is formed on the first ink layer.

A method for manufacturing an electronic device includes:

Providing a transparent cover, and printing a first ink layer on a surface of the cover;

Printing a second ink layer on a surface of the cover plate having a first ink layer, the second ink layer including a decorative pattern and an alignment mark; the decorative pattern directly covers the cover plate, and the alignment mark is formed on On the first ink layer.

A smart watch includes a transparent cover plate, a first ink layer and a second ink layer are disposed on one surface of the cover plate, and the first ink layer directly covers the cover plate,

The second ink layer includes a decorative pattern and an alignment mark, the decorative pattern directly covers the cover plate, and the alignment mark is formed on the first ink layer.

Compared with the conventional technology, the decorative pattern and the alignment mark of the electronic device (such as a smart watch) of the present invention are formed by the same ink layer in the same printing process, which can reduce the position between the decorative pattern and the alignment mark. Deviation to improve the alignment accuracy of subsequent components during alignment.

The drawings show embodiments of the present invention, and the present invention can be implemented in many different forms, and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. For clarity, the dimensions of layers and regions have been exaggerated in the figure.

It is understood that although the terms first, second, etc. may be used herein to describe various elements, elements, regions, layers and / or sections, these elements, elements, regions, layers and / or sections should not be limited to these terms . These terms are only used to distinguish one element, element, region, layer and / or part from another element, element, region, layer and / or part. Accordingly, the first part, element, region, layer, and / or part discussed below can be referred to as the second element, element, region, layer, and / or part without departing from the teachings of the present invention.

The proper nouns used herein are only used to describe specific embodiments and are not intended to limit the present invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that when the terms "comprising" and "including" are used in the specification, the presence of stated features, integers, steps, operations, elements and / or components is indicated, but one or more other features, integers are not excluded , Steps, operations, presence of elements and / or components.

Embodiments of the present invention are described here with reference to cross-sectional views, which are schematic diagrams of idealized embodiments (and intermediate structures) of the present invention. Thus, variations in the shapes of the illustrations as a result of manufacturing processes and / or tolerances are to be expected. Therefore, the embodiments of the present invention should not be interpreted as being limited to the specific shape of the region illustrated here, but should include deviations in the shape due to, for example, manufacturing. The regions shown in the figures are schematic only, and their shapes are not intended to illustrate the actual shape of the device and are not intended to limit the scope of the invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in the general dictionary should be interpreted to have meanings consistent with their meaning in the context of the relevant field, and should not be interpreted in an over-ideal or over-formal meaning Unless explicitly defined in this article.

This embodiment uses a wearable electronic device as an example for description. However, it is not limited to the wearable electronic device. In other embodiments, the alignment method of the present invention may be other types of electronic devices applicable to the technical solution. Specifically, a specific embodiment of the electronic device of the present invention will be described below by taking a wearable electronic device with a display function as an example.

Please refer to FIG. 1, which is a schematic plan view of an electronic device 100 according to a first embodiment of the present invention. In this embodiment, the electronic device 100 is a wearable electronic device with a display function, but is not limited thereto. In other embodiments, the electronic device 100 may be other electronic devices. Specifically, in this embodiment, the electronic device 100 is a smart watch. The electronic device 100 includes a cover plate 1 and a display panel (not shown) for protecting other components inside the electronic device 100. The cover plate 1 may be a suitable transparent material such as glass or plastic. The display panel may be a liquid crystal display panel, an organic light emitting display panel, and the like, but is not limited thereto. In this embodiment, the material of the cover plate 1 or the type of the display panel is not limited. In this embodiment, the cover plate 1 is circular, but is not limited thereto. In other embodiments, the cover plate 1 may be set to other shapes, such as an oval shape or other polygons, as required. The cover plate 1 includes a central region 101 and a peripheral region 102 surrounding the central region 101. In this embodiment, the display screen of the display panel is displayed through the central area 101. In other embodiments, the central area 101 may also be used to implement other functions, such as being used as an area for receiving a touch sensing operation in an electronic device with a touch sensing function.

Please refer to FIG. 1, FIG. 2 and FIG. 3 together. FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a schematic cross-sectional view taken along the line III-III of FIG. 1. For the convenience of description, some components of the electronic device 100 are omitted in FIG. 2, for example, components such as a display panel and a back plate are omitted. A multi-layer ink is printed on the peripheral region 102 of the cover plate 1. In this embodiment, the peripheral region 102 is printed with the first ink layer 2, the second ink layer 3, the third ink layer 4 and the fourth ink layer on the same surface 110 of the cover plate 1 through four printing processes, respectively. 5, as shown in Figure 2. The surface 110 is a surface which is not exposed during use and does not contact the user. During use, the user can observe the ink layer through the cover 1.

The first ink layer 2 is used as a background color of the peripheral region 102 of the cover plate 1. The first ink layer 2 includes a first pattern 21 and a second pattern 22. As shown in FIGS. 1 and 2, in this embodiment, the first pattern 21 and the second pattern 22 are concentric rings. An inner diameter of the first pattern 21 is larger than an inner diameter of the second pattern 22.

The second ink layer 3 includes a third pattern 31 as a decorative pattern and an alignment mark 32 for registering the elements. Preferably, there is sufficient space between the first pattern 21 and the second pattern 22 to print the third pattern 31. It can be understood that the pattern formed by the first ink layer 2 is not limited to that the first pattern 21 and the second pattern 22 are concentric rings, as long as the registration mark 32 can be blocked from being viewed by the user from the front surface of the cover plate 1 Just fine.

The third pattern 31 is formed between the first pattern 21 and the second pattern 22 and is annular. The third pattern 31 includes a plurality of spaced-apart sub-patterns 311. Each of the sub-patterns 311 is provided with a hollow portion having a shape of a desired pattern (such as a LOGO or a number), and the hollow portion is covered with a third ink. Layer 4 is filled with coverage. The shape of the hollow portion can be designed according to a required pattern. In this embodiment, the third pattern 31 is directly formed on the surface 110 of the cover plate 1 and does not cover the first ink layer 2. Therefore, the third pattern 31 is not blocked by the first ink layer 2. In this embodiment, the third pattern 31 has 24 sub-patterns 311 in total, and the patterns of the hollow portions on the sub-patterns 311 are numbers 1 to 24, respectively. The alignment mark 32 is used for alignment between the cover plate and other components, such as a display panel (not shown), in a subsequent assembly process, so that the display area of the display panel corresponds to the central area 101. The picture displayed on the display panel is not blocked by the ink in the peripheral area 102. The registration mark 32 is formed on a surface of the first ink layer 2 away from the cover plate 1, and the registration mark 32 is completely blocked by the first ink layer 2. During the use of the electronic device 100, When viewed from the front of the cover plate 1, the registration mark 32 will not be seen by the user. In this embodiment, the registration mark 32 is formed on the first pattern 21 of the first ink layer 2, but is not limited thereto. In other embodiments, the registration mark 32 may form the second pattern 22 of the first ink layer 2. The third pattern 31 and the registration mark 32 can be formed at the same time by the same printing process and the same layer of ink, so that the error between the registration mark and the third pattern can be effectively reduced. In this embodiment, in order not to affect the normal use of the registration mark 32, the first ink layer 2 and the second ink layer 3 are different colors.

The third ink layer 4 is formed on the third pattern 31 of the second ink layer 3 and at least covers and fills the hollow portion of the third pattern 31. The third ink layer 4 is formed at a portion of the hollow portion of the third pattern 31 Fourth pattern 411. In this embodiment, the third ink layer 4 forms a plurality of third ink sub-blocks 41 that substantially cover each sub-pattern 311. Preferably, the third ink sub-block 41 is slightly smaller than the sub-pattern 311 to prevent the third ink sub-block 41 from exceeding the boundary of the sub-pattern 311 due to the tolerance of the printing sleeve. The hollow portion of each sub-pattern 311 is filled with the third ink sub-block 41 to form the fourth pattern 411. Preferably, the color of the third ink layer 4 is different from the color of the second ink layer 3. . In this embodiment, the shape of the fourth pattern 411 is a number from 1 to 24, but is not limited thereto, and the fourth pattern 411 may be other required patterns.

As shown in FIG. 1, in this embodiment, there is a gap 312 between adjacent sub-patterns 311 to expose the cover plate 1. As shown in FIG. 2, the fourth ink layer 5 serves as a light-shielding layer, and covers the portion of the first ink layer 2, the second ink layer 3 that is not covered by the third ink layer 4, and the third ink layer 4 and avoids (ie Do not cover) the registration mark 32, that is, the registration mark 32 will not be covered by the fourth ink layer 5 and exposed, and will not be blocked by the fourth ink layer 5. As shown in FIG. 1, in this embodiment, the fourth ink layer 5 further covers (fills) the gap 312 between the adjacent sub-patterns 311 to form the outer frame 51 of the fourth pattern. It should be noted that the gap 312 between the sub-patterns 311 does not have to exist. The gap 312 between the sub-patterns 311 is formed according to design requirements. In other embodiments, when it is not necessary to form When the outer frame 51 of the fourth pattern is used, the gap 312 between the sub-patterns 311 may not be formed. In this embodiment, the fourth ink layer 5 has a ring shape with a notch 52 (as shown in FIG. 9), and the notch 52 corresponds to the registration mark 32. As shown in FIG. 3, the inner edge of the ring of the fourth ink layer 5 is flush with the inner edge of the second pattern 22 of the first ink layer 2. Except for the gap 52 that exposes the registration mark 32, the fourth ink The ring-shaped outer edge of the layer 5 is flush with the outer edge of the first pattern 21 of the first ink layer 2.

The registration mark 32 and the third pattern 31 of the cover plate 1 of the first embodiment of the present invention are simultaneously formed by the same printing process, which can effectively reduce the error between the registration mark 32 and the third pattern 31 (± 0.2 ° < The error is less than ± 1 °). After printing the fourth ink layer 5 (light-shielding layer), the registration mark 32 will not be blocked, so that the registration mark 32 can be applied to subsequent registration with other components (such as a display panel). , Reduce the alignment error between the cover plate 1 and other components.

Viewed from the front side of the cover plate 1, the registration mark 32 is completely blocked by the first ink layer 2. Therefore, during the assembly process of the electronic device 100, when viewed from the surface 110 of the cover plate, the registration mark 32 does not It is blocked by the fourth ink layer 5, so it will not affect the assembly and alignment with other elements.

Please refer to FIG. 4, which is a schematic plan view of an electronic device 200 according to a second embodiment of the present invention. The structure of the electronic device 200 is basically the same as the structure of the electronic device 100 of the first embodiment. For the convenience of description, the components with the same structure and functions in the second embodiment use the component symbols of the first embodiment. In this embodiment, the second ink layer 3 includes a ring-shaped third pattern 31 as a decorative pattern and an alignment mark 32 for alignment. The third pattern 31 includes a plurality of sub-patterns 311, each of which has a hollow portion having a shape of a desired pattern (such as a LOGO or a number), and the hollow portion is filled and covered by the third ink layer 4. . The shape of the hollow portion can be designed according to a required pattern. In this embodiment, the third pattern 31 is directly formed on the surface of the cover plate 1 and does not cover the first ink layer 2. Therefore, the third pattern 31 is not blocked by the first ink layer 2. In this embodiment, the pattern of the hollow portion includes numbers 1 to 24, and the third pattern 31 may include a plurality of tick marks 6 corresponding to the numbers 1 to 24 in addition to the hollow numbers 1 to 24. . In this embodiment, each scale line 6 is aligned with each outer frame 51, and each scale line 6 is located on an extension of the central axis of two adjacent numbers, but is not limited thereto. In other embodiments, the scale line 6 is not limited to being formed by the second ink layer 3, and may also be formed by one of the first ink layer 2, the third ink layer 4, or the fourth ink layer 5. In this embodiment, the third ink layer 4 is formed on the third pattern 31 of the second ink layer 3 to cover at least the hollow portion of the third pattern 31. The third ink layer 4 forms a plurality of third ink sub-blocks 41 substantially covering each sub-pattern 311. Preferably, the third ink sub-block 41 is slightly smaller than the sub-pattern 311. Preferably, the third ink sub-block 41 is slightly smaller than the sub-pattern 311 to prevent the third ink sub-block 41 from exceeding the boundary of the sub-pattern 311 due to the tolerance of the printing sleeve. The hollow portion of each sub-pattern 311 is filled with the third ink sub-block 41 to form the fourth pattern 411. Preferably, the color of the third ink layer 4 is different from the color of the second ink layer 3. . In this way, the numbers (hollow portions) and tick marks of the third pattern 31 need not be formed by two different printing processes, but can be formed together by the same printing process, thereby reducing the number (hollow portions) and the tick marks. Tolerance of offset (<0.1mm).

Please refer to FIG. 5, which is a schematic plan view of an electronic device 300 according to a third embodiment of the present invention. The structure of the electronic device 300 is basically the same as the structure of the electronic device of the first embodiment. Similarly, for convenience of description, the third embodiment follows the component symbols of the first embodiment. In this embodiment, the second ink layer 3 includes a third pattern 31 as a decorative pattern and an alignment mark 32 for registering the elements. The third pattern 31 includes a plurality of sub-patterns 311 arranged at intervals. The sub-pattern 311 does not have a hollow portion, but is directly a desired pattern (such as a digital pattern). That is, the second ink layer 3 forms the required pattern (third pattern 31) and the registration mark 32 at the same time, so that no additional third ink layer 4 is required to cover the hollow of the second ink layer 3 To form the desired pattern. At the same time, the third pattern 31 and the registration mark 32 are simultaneously formed in the same printing process, which reduces the positional deviation between the third pattern 31 and the registration mark 32. At this time, after the second ink layer 3 is printed, the third ink layer 4 may be unnecessary, and the fourth ink layer 5 may be directly printed as a light-shielding layer.

The manufacturing method of the electronic device of the present invention is described by taking the method of manufacturing the electronic device 100 according to the first embodiment as an example.

Please refer to FIG. 6 to FIG. 9, which are schematic cross-sectional views of a method for manufacturing the electronic device 100 according to the first embodiment of the present invention. The manufacturing method includes:

Step 1: As shown in FIG. 6, a cover plate 1 is provided, and a first ink layer 2 is printed on a surface 110 of the cover plate 1, and the first ink layer 2 is used as a background color of the cover plate 1.

In this embodiment, the first ink layer 2 includes a first pattern 21 and a second pattern 22, and the first pattern 21 and the second pattern 22 are concentric rings. It can be understood that the first ink layer 2 is formed The pattern is not limited to the first pattern 21 and the second pattern 22 being concentric rings, as long as it can block the registration mark 32 from being viewed by the user from the front surface of the cover plate 1. An inner diameter of the first pattern 21 is larger than an inner diameter of the second pattern 22. Preferably, there is sufficient space between the first pattern 21 and the second pattern 22 to print the second ink layer 3.

Step 2: As shown in FIG. 7, a second ink layer 3 is printed on the cover 1 with a surface 110 of a first ink layer 2. The second ink layer 3 includes a third pattern 31 and an alignment for alignment. Mark 32. The third pattern 31 is formed between the first pattern 21 and the second pattern 22. The third pattern 31 includes a plurality of sub-patterns 311, and each of the sub-patterns 311 includes a hollow portion. The registration mark 32 is formed on the first ink layer 2.

The hollow portion has a shape of a desired pattern (such as a LOGO or a number). In this embodiment, the registration mark 32 covers the first pattern 21 of the first ink layer 2, but is not limited thereto. In other embodiments, the registration mark 32 may cover the second pattern 22 of the first ink layer 2. Optionally, in this embodiment, there is a gap 312 between the adjacent sub-patterns 311 to expose the cover plate 1.

Step 3: As shown in FIG. 8, a third ink layer 4 is printed. The third ink layer 4 is formed on the third pattern 31 of the second ink layer 3 to cover and fill at least the hollow portion of the third pattern 31. A portion of the ink layer 4 located in the hollow portion of the third pattern 31 forms a fourth pattern 411. In this embodiment, the third ink layer 4 forms a plurality of third ink sub-blocks 41 that substantially cover each sub-pattern 311. Preferably, the third ink sub-block 41 is slightly smaller than the sub-pattern 311 to prevent the third ink sub-block 41 from exceeding the boundary of the sub-pattern 311 due to the tolerance of the printing sleeve. The hollow portion of each sub-pattern 311 is filled with the third ink sub-block 41 to form the fourth pattern 411. Preferably, the color of the third ink layer 4 is different from the color of the second ink layer 3. .

Step 4: As shown in FIG. 9, a fourth ink layer 5 is printed as a light-shielding layer, and the fourth ink layer 5 covers the first ink layer 2, the second ink layer 3, and the third ink layer 4 and avoids the Alignment mark 32.

Specifically, the fourth ink layer has a notch 52 that exposes the registration mark 32; that is, the registration mark 32 is not covered by the fourth ink layer 5 and is exposed, and is not exposed by the fourth ink layer 5. Occlusion.

In this embodiment, the fourth ink layer 5 covers the gap 312 between the adjacent sub-patterns 311 to form an outer frame 51 of the fourth pattern. It should be noted that the gap 312 between the sub-patterns 311 does not have to exist. The gap 312 between the sub-patterns 311 is formed according to design requirements. In other embodiments, when it is not necessary to form When the outer frame 51 of the fourth pattern is used, the gap 312 between the sub-patterns 311 may not be formed.

It can be understood that the decorative pattern formed by the second ink layer 3 is not limited to the above-mentioned digital hollow pattern or digital pattern, and can also be designed into any other shape according to actual needs. The 24 mentioned can also be designed as any other number according to actual needs, such as 12, 6 and so on.

In addition, the manufacturing method of the electronic device 300 according to the third embodiment of the present invention is similar to the manufacturing method of the electronic device 100 according to the first embodiment, except that the second ink layer 3 does not have a hollow portion, but directly has the required Pattern (such as LOGO or digital), therefore, no additional third ink layer 4 is needed to fill the hollow portion of the second ink layer 3 to form a desired pattern. After the second ink layer 3 is printed, the fourth ink layer 5 may be directly printed as a light-shielding layer.

The above embodiments are only used to illustrate the technical solution of the present invention, but not limited. Although the present invention has been described in detail with reference to preferred implementations, those skilled in the art should understand that the technical solution of the present invention can be modified or equivalently replaced, Without departing from the spirit and scope of the technical solution of the present invention.

100‧‧‧ electronic device

101‧‧‧Central District

102‧‧‧Peripheral area

110‧‧‧ surface

1‧‧‧ cover

2‧‧‧The first ink layer

21‧‧‧ the first pattern

22‧‧‧Second pattern

3‧‧‧second ink layer

31‧‧‧ third pattern

311‧‧‧ sub-pattern

32‧‧‧ Registration mark

312‧‧‧Gap

4‧‧‧ third ink layer

41‧‧‧Third Ink Subblock

411‧‧‧Fourth pattern

5‧‧‧Fourth ink layer

51‧‧‧frame

52‧‧‧ gap

6‧‧‧ tick marks

FIG. 1 is a schematic plan view of an electronic device according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. 1.

FIG. 3 is a schematic cross-sectional view taken along the line III-III of FIG. 1.

FIG. 4 is a schematic plan view of an electronic device according to a second embodiment of the present invention.

FIG. 5 is a schematic plan view of an electronic device according to a third embodiment of the present invention.

6 to 9 are schematic cross-sectional views of a method for manufacturing an electronic device according to a first embodiment of the present invention.

Claims (16)

An electronic device includes a transparent cover plate, a first ink layer and a second ink layer are disposed on one surface of the cover plate, and the first ink layer directly covers the cover plate, and the improvement is that: The second ink layer includes a decorative pattern and an alignment mark, the decorative pattern directly covers the cover plate, and the alignment mark is formed on the first ink layer. The electronic device according to claim 1, wherein the decorative pattern is formed with a hollow portion. The electronic device according to claim 2, wherein the electronic device further includes a third ink layer, and the third ink layer at least covers and fills the hollow portion. The electronic device according to claim 3, wherein the electronic device further includes a fourth ink layer, and the fourth ink layer covers the first ink layer and a decorative pattern not covered by the third ink layer. And the third ink layer without covering the registration mark. The electronic device according to claim 1, wherein the electronic device further includes a fourth ink layer, and the fourth ink layer covers the first ink layer and the decorative pattern and does not cover the registration mark. The electronic device according to claim 4 or 5, wherein: the decorative pattern includes a plurality of sub-patterns arranged at intervals, and there is a gap between the adjacent sub-patterns; the gap is filled by the fourth ink layer . An electronic device manufacturing method includes: providing a transparent cover plate, printing a first ink layer on a surface of the cover plate; printing a second ink layer on a surface of the cover plate having a first ink layer, the The second ink layer includes a decorative pattern and an alignment mark; the decorative pattern directly covers the cover plate, and the alignment mark is formed on the first ink layer. The method for manufacturing an electronic device according to claim 7, wherein: the decorative pattern includes a hollow portion; the method for manufacturing the electronic device further includes: printing a third ink layer, the third ink layer covering and filling at least Mentioned hollow portion. The method for manufacturing an electronic device according to claim 8, wherein the third ink layer is smaller than the decorative pattern and substantially covers the decorative pattern. The method for manufacturing an electronic device according to claim 8, wherein the method for manufacturing the electronic device further comprises: printing a fourth ink layer, the fourth ink layer covering the first ink layer and not being covered by the first ink layer. The three ink layer covers the decorative pattern and the third ink layer and does not cover the registration mark. A smart watch includes a transparent cover plate, and a first ink layer and a second ink layer are disposed on one surface of the cover plate, and the first ink layer directly covers the cover plate. The improvement is that: The second ink layer includes a decorative pattern and an alignment mark, the decorative pattern directly covers the cover plate, and the alignment mark is formed on the first ink layer. The smart watch according to claim 11, wherein the decorative pattern is formed with a hollow portion. The smart watch according to claim 12, wherein the smart watch further includes a third ink layer, and the third ink layer at least covers and fills the hollow portion. The smart watch according to claim 13, wherein the smart watch further includes a fourth ink layer, and the fourth ink layer covers the first ink layer and a decorative pattern not covered by the third ink layer And the third ink layer without covering the registration mark. The smart watch according to claim 11, wherein the smart watch further includes a fourth ink layer, and the fourth ink layer covers the first ink layer and the decorative pattern and does not cover the registration mark. The smart watch according to claim 14 or 15, wherein: the decorative pattern includes a plurality of sub-patterns arranged at intervals, and there is a gap between adjacent sub-patterns; the gap is filled by the fourth ink layer.