TWI702580B - Display device and manufacturing method thereof - Google Patents

Abstract

A display device includes a display module and an optical film. The display module has a through hole. At least one optical film is located on the display module and has an alignment through hole aligned with the through hole and an alignment mark surrounding the alignment through hole.

Description

Display device and manufacturing method thereof

The present invention relates to the field of display technology, and particularly relates to a display device and a manufacturing method thereof.

In the process of manufacturing the display device, an optical layer is placed on the display module. The attachment between the display module and the optical layer is usually performed by using the relative distance between the reference edge of the display module and the reference edge of the optical layer as a reference.

However, if the above attachment method is adopted, when both the display module and the optical layer have through holes, the difference in shape between the two will directly affect the alignment accuracy of the through holes of the display module and the through holes of the optical layer. In detail, the above-mentioned attaching method easily causes the center of the through hole of the display module to fail to align with the center of the through hole of the optical layer. These problems are particularly serious when the shape of the display module is non-square.

In view of this, there is an urgent need for new display devices and manufacturing methods.

The present disclosure provides a display device, which includes a display module and a first optical layer. The display module has a through hole. The first optical layer is located on the display module and has a first alignment hole (Alignment hole) aligned with the through hole and a first alignment mark (Alignment mark) surrounding the first alignment hole.

In some embodiments, the display device further includes a light source disposed beside the side surface of the first optical layer, and the first optical layer is a light guide plate.

In some embodiments, the display device further includes a second optical layer disposed on the first optical layer, and the second optical layer has a second alignment through hole that is aligned with the first alignment through hole and surrounds the second alignment through hole. The second alignment mark of the hole, wherein the first alignment mark is aligned with the second alignment mark.

In some embodiments, the first optical layer is a light guide plate, and the second optical layer is an anti-glare layer or a touch sensing layer.

In some embodiments, the display device further includes a third optical layer on the second optical layer, the third optical layer having a third alignment through hole aligned with the second alignment through hole and surrounding the third alignment through hole The third alignment mark of, wherein the second alignment mark is aligned with the third alignment mark, the first optical layer is a light guide plate, the second optical layer is a touch sensing layer, and the third optical layer is an anti-glare layer.

In some embodiments, the display module includes a visible area and a non-visible area, the visible area surrounds the non-visible area, and the through hole is located in the non-visible area.

In some embodiments, the display module further includes a light-emitting display layer.

The present disclosure provides a method for manufacturing a display device. The production method includes the following operations: receiving the display module; forming on the display module A through hole is formed; a mark auxiliary alignment mark is placed on the periphery of the through hole; a first optical layer is arranged on the display module, and the first optical layer has a first alignment through hole and a first alignment mark surrounding the first alignment through hole ; Align the first alignment mark with the auxiliary alignment mark so that the first alignment through hole is aligned with the through hole.

In some embodiments, the manufacturing method further includes: disposing a second optical layer on the first optical layer, the second optical layer having a second alignment through hole and a second alignment mark surrounding the second alignment through hole; The second alignment mark is aligned with the first alignment mark, so that the second alignment through hole is aligned with the first alignment through hole.

In some embodiments, the manufacturing method further includes: disposing a third optical layer on the second optical layer, the third optical layer having a third alignment through hole and a third alignment mark surrounding the third alignment through hole; The third alignment mark is aligned with the second alignment mark, so that the third alignment through hole is aligned with the second alignment through hole.

In some embodiments, the manufacturing method further includes arranging a light source on the side surface of the first optical layer.

In some embodiments, the method of forming the through hole is laser cutting.

100, 200, 300, 400‧‧‧Display device

110‧‧‧Display Module

120‧‧‧First adhesive layer

130‧‧‧Light guide plate

140‧‧‧Second adhesive layer

150、180‧‧‧Anti-glare layer

160‧‧‧Touch sensor layer

170‧‧‧The third adhesive layer

AM‧‧‧Auxiliary registration mark

H, h1, h2, h3‧‧‧through hole

H1‧‧‧The first through hole

H21, H22‧‧‧Second alignment through hole

H3‧‧‧Third Alignment Through Hole

IR‧‧‧Invisible area

LS‧‧‧Light source

LR‧‧‧Light guide spot area

M11, M12‧‧‧First alignment mark

M21, M22‧‧‧Second alignment mark

M3‧‧‧The third alignment mark

NLR‧‧‧No light guide spot area

S‧‧‧ side

VR‧‧‧Viewing area

The above and other aspects, features, and other advantages of the present invention can be understood more clearly by referring to the contents of the manual and with the additional drawings.

FIGS. 1A, 2A, 3A, and 4A respectively show three-dimensional schematic diagrams of display devices according to some embodiments of the present disclosure.

Figures 1B, 2B, 3B, and 4B show exploded schematic views of the display devices shown in Figures 1A, 2A, 3A, and 4A, respectively.

Figures 1C, 2C, 3C, and 4C show schematic top views of the display devices shown in Figures 1A, 2A, 3A, and 4A, respectively.

In order to make the description of the present disclosure more detailed and complete, please refer to the attached drawings and various embodiments described below. The same numbers in the drawings represent the same or similar elements.

Hereinafter, multiple embodiments of the present invention will be disclosed in the form of drawings. For clear description, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventionally used structures and elements will be shown in a simple schematic manner in the drawings.

FIG. 1A is a three-dimensional schematic diagram of a display device 100 according to some embodiments of the present disclosure. As shown in FIG. 1A, the display device 100 includes a display module 110, a first adhesive layer 120, an optical layer such as a light guide plate 130, and a light source LS. The light guide plate 130 is located on the display module 110. The first adhesive layer 120 is located between the light guide plate 130 and the display module 110 to bond the display module 110 and the light guide plate 130. The light source LS is arranged beside the side surface S of the light guide plate 130. The configuration of the light source in the display device of this embodiment is front light formula. However, the arrangement of the light source in the display device of the present invention can also be a direct type or a backlight type, that is, the light source is located under the light guide plate or the light guide plate is located under the display module. The light source LS may be a light emitting diode (LED).

FIG. 1B is an exploded schematic diagram of the display device 100 shown in FIG. 1A. As shown in FIG. 1B, the display module 110 has a through hole H and includes a visible area VR and a non-visible area IR. The visible area VR surrounds the non-visible area IR, and the through hole is located in the non-visible area IR. In some embodiments, the display module 110 is a reflective display module 110, such as a flexible electronic paper display module (Electronic paper display module). The display module 110 may be a self-luminous module, such as an organic light emitting diode (Organic LED, OLED). When the display module is a self-luminous module, the light source LS can be omitted. The display module 110 may be a non-reflective display module, such as a liquid crystal display (LCD), and when the display module is a non-reflective display module, the light guide plate may be located under the display module.

The light guide plate 130 has a first alignment through hole H1 aligned with the through hole H and a first alignment mark M11 surrounding the first alignment through hole H1. In some embodiments, the light guide plate 130 includes a light guide dot region LR and a non-light guide dot region NLR, the light guide dot region LR surrounds the non-light guide dot region NLR, and the first alignment through hole H1 is located There is no light guide point in the NLR. In some embodiments, the first alignment mark M11 is an ink pattern. For example, when the light guide points on the light guide plate 130 are formed by screen printing, the first alignment mark M11 can be formed by screen printing at the same time. In another embodiment, the first alignment mark M11 is an etching pattern. For example, when the light guide points on the light guide plate 130 are formed by etching, the first alignment mark can be formed by etching at the same time M11. As shown in FIG. 1B, the first alignment mark M11 is a ring mark with four sharp corners pointing to the first alignment through hole H1. However, the shape of the first alignment mark M11 is not limited to this. In another embodiment, the first alignment mark M11 is a mark having four sharp corners pointing to the first alignment through hole H1.

The manufacturing method of the above-mentioned display device 100 may include the following operations: receiving a display module. A through hole H is formed on the display module to form the display module 110. In some embodiments, the method of forming the through hole H is laser cutting. Auxiliary alignment mark AM is displayed around the through hole H. A light guide plate 130 is disposed on the display module 110, wherein the light guide plate 130 has a first alignment through hole H1 and a first alignment mark M11 surrounding the first alignment through hole H1. The first alignment mark M11 of the light guide plate 130 is aligned with the auxiliary alignment mark AM of the display module 110 so that the first alignment through hole H1 of the light guide plate 130 is aligned with the through hole of the display module 110. In some embodiments, the manufacturing method further includes arranging the light source LS beside the side surface S of the light guide plate 130. In some embodiments, the manufacturing method further includes bonding the display module 110 and the light guide plate 130 with a first adhesive layer 120, wherein the first adhesive layer 120 has through holes aligned with the first alignment through holes H1 and the through holes H h1. In addition, after the alignment is completed, the auxiliary alignment mark AM on the display module 110 may disappear. Therefore, in some embodiments, the display device 100 does not display the auxiliary alignment mark AM. As shown in FIG. 1B, the auxiliary alignment marks AM are four linear marks extending from the four edges of the display module 110 to the through hole H. However, the shape of the auxiliary alignment mark AM is not limited to this.

FIG. 1C is a schematic top view of the display device 100 shown in FIG. 1A. Please refer to Figures 1B and 1C at the same time, by aligning the first alignment mark M11 with the auxiliary alignment mark AM, that is, the first alignment mark M11 The sharp corners of are aligned with the linear marks in the auxiliary alignment mark AM, and the first alignment through hole H1 of the light guide plate 130 can be aligned with the through hole H of the display module 110. Moreover, the above-mentioned alignment method can improve the alignment accuracy of the first alignment through hole H1 of the light guide plate 130 and the through hole H of the display module 110.

FIG. 2A is a three-dimensional schematic diagram of a display device 200 according to some embodiments of the present disclosure. As shown in FIG. 2A, the display device 200 includes a display module 110, a first adhesive layer 120, a first optical layer such as a light guide plate 130, a light source LS, a second adhesive layer 140, and a second optical layer such as an anti-glare layer 150. The anti-glare layer 150 is located on the light guide plate 130, and the second adhesive layer 140 is located between the anti-glare layer 150 and the light guide plate 130 to bond the anti-glare layer 150 and the light guide plate 130. The difference between the display device 200 and the display device 100 is that the display device 200 further includes a second adhesive layer 140 and an anti-glare layer 150.

FIG. 2B is an exploded schematic diagram of the display device 200 shown in FIG. 2A. As shown in Figure 2B, the anti-glare layer 150 has a second alignment through hole H21 and a second alignment mark M21 surrounding the second alignment through hole H21, wherein the second alignment through hole H21 of the anti-glare layer 150 is connected to The first alignment through hole H1 of the light guide plate 130 is aligned.

In some embodiments, the second alignment mark M21 is an ink pattern or an etching pattern. As shown in FIG. 2B, the second alignment mark M21 is a ring mark with four sharp corners pointing away from the second alignment through hole H21. However, the shape of the second alignment mark M21 is not limited to this. In another embodiment, the second alignment mark M21 is a mark having four sharp corners pointing away from the second alignment through hole H21.

The manufacturing method of the above-mentioned display device 200 may include the following operations Work: Receive the display device 100. The anti-glare layer 150 is disposed on the display device 100. In detail, an anti-glare layer 150 is disposed on the light guide plate 130, wherein the anti-glare layer 150 has a second alignment through hole H21 and a second alignment mark M21 surrounding the second alignment through hole H21. The second alignment mark M21 of the anti-glare layer 150 is aligned with the first alignment mark M11 of the light guide plate 130, so that the second alignment through hole H21 is aligned with the first alignment through hole H1. In some embodiments, the manufacturing method further includes bonding the light guide plate 130 and the anti-glare layer 150 with a second adhesive layer 140, wherein the second adhesive layer 140 has a pair of the first alignment through hole H1 and the second alignment through hole H21. Bit through hole h2.

FIG. 2C is a schematic top view of the display device 200 shown in FIG. 2A. Please refer to Figures 2B and 2C at the same time, by aligning the second alignment mark M21 with the first alignment mark M11, that is, the sharp corner of the second alignment mark M21 and the sharp corner of the first alignment mark M11 The corners are aligned, and the second alignment through hole H21 of the anti-glare layer 150 can be aligned with the first alignment through hole H1 of the light guide plate 130. Moreover, the above-mentioned alignment method can improve the alignment accuracy of the second alignment through hole H21 of the anti-glare layer 150 and the first alignment through hole H1 of the light guide plate 130.

FIG. 3A is a three-dimensional schematic diagram of a display device 300 according to some embodiments of the present disclosure. As shown in FIG. 3A, the display device 300 includes a display module 110, a first adhesive layer 120, a first optical layer such as a light guide plate 130, a light source LS, a second adhesive layer 140, and a second optical layer such as a touch sensor.测layer 160. The touch sensing layer 160 is located on the light guide plate 130, and the second adhesive layer 140 is located between the touch sensing layer 160 and the light guide plate 130 to bond the touch sensing layer 160 and the light guide plate 130. The difference between the display device 300 and the display device 100 is that the display device 300 further includes a second adhesive layer 140 and The touch sensing layer 160.

FIG. 3B is an exploded schematic diagram of the display device 300 shown in FIG. 3A. As shown in FIG. 3B, the touch sensing layer 160 has a second alignment through hole H22 and a second alignment mark M22 surrounding the second alignment through hole H22, wherein the second alignment of the touch sensing layer 160 The through hole H22 is aligned with the first aligning through hole H1 of the light guide plate 130.

In some embodiments, the second alignment mark M22 is an ink pattern or an etching pattern. As shown in FIG. 3B, the second alignment mark M22 is a ring mark with four sharp corners pointing away from the second alignment through hole H22. However, the shape of the second alignment mark M22 is not limited to this. In another embodiment, the second alignment mark M22 is a mark having four sharp corners pointing away from the second alignment through hole H22.

The manufacturing method of the above-mentioned display device 300 may include the following operations: receiving the display device 100. The touch sensing layer 160 is disposed on the display device 100. In detail, the touch sensing layer 160 is disposed on the light guide plate 130, wherein the touch sensing layer 160 has a second alignment through hole H22 and a second alignment mark M22 surrounding the second alignment through hole H22. The second alignment mark M22 of the touch sensing layer 160 is aligned with the first alignment mark M11 of the light guide plate 130, so that the second alignment through hole H22 is aligned with the first alignment through hole H1. In some embodiments, the manufacturing method further includes bonding the light guide plate 130 and the touch sensing layer 160 with a second adhesive layer 140, wherein the second adhesive layer 140 has a first alignment through hole H1 and a second alignment through hole H22 aligned through hole h2.

FIG. 3C is a schematic top view of the display device 300 shown in FIG. 3A. Please refer to Figures 3B and 3C at the same time, by aligning the second alignment mark M22 with the first alignment mark M11, that is, the second alignment mark M22 The sharp corner of is aligned with the sharp corner of the first alignment mark M11, and the second alignment through hole H22 of the touch sensing layer 160 can be aligned with the first alignment through hole H1 of the light guide plate 130. In addition, the aforementioned alignment method can improve the alignment accuracy of the second alignment through hole H22 of the touch sensing layer 160 and the first alignment through hole H1 of the light guide plate 130.

FIG. 4A is a three-dimensional schematic diagram of a display device 400 according to some embodiments of the present disclosure. As shown in FIG. 4A, the display device 400 includes a display module 110, a first adhesive layer 120, a first optical layer such as a light guide plate 130, a light source LS, a second adhesive layer 140, and a second optical layer such as a touch sensor. The measuring layer 160, the third adhesive layer 170 and the third optical layer are, for example, the anti-glare layer 180. The anti-glare layer 180 is located on the touch sensing layer 160, and the third adhesive layer 170 is located between the anti-glare layer 180 and the touch sensing layer 160, adhering the anti-glare layer 180 and the touch sensing layer 160. The difference between the display device 400 and the display device 300 is that the shape of the first alignment mark M11 of the display device 300 is different from the first alignment mark M12 of the display device 400, and the display device 400 further includes a third adhesive layer 170 and a resist Glare layer 180.

FIG. 4B is an exploded schematic diagram of the display device 400 shown in FIG. 4A. As shown in FIG. 4B, the light guide plate 130 has a first alignment through hole H1 aligned with the through hole H and a first alignment mark M12 surrounding the first alignment through hole H1. In some embodiments, the first alignment mark M12 is an ink pattern or an etching pattern. As shown in FIG. 4B, the first alignment mark M12 is a ring mark with four diamond patterns, and one end of each diamond pattern points to the first alignment through hole H1. However, the shape of the first alignment mark M12 is not limited to this. In another embodiment, the first alignment mark M12 is a mark composed of four diamond-shaped patterns, wherein one end of each diamond-shaped pattern points to the first alignment pass.孔 H1.

Continuing to refer to FIG. 4B, the anti-glare layer 180 has a third alignment through hole H3 and a third alignment mark M3 surrounding the third alignment through hole H3, wherein the third alignment through hole H3 of the anti-glare layer 180 and the contact The second alignment through hole H22 of the control sensing layer 160 is aligned. In some embodiments, the third alignment mark M3 is an ink pattern or an etching pattern. The third alignment mark M3 is an annular mark with four sharp corners pointing to the third alignment through hole H3. However, the shape of the third alignment mark M3 is not limited to this. In another embodiment, the third alignment mark M3 is a mark having four sharp corners pointing to the third alignment through hole H3.

The manufacturing method of the above-mentioned display device 400 may include the following operations: receiving a display module. A through hole H is formed on the display module to form the display module 110. Auxiliary alignment mark AM is displayed around the through hole H. A light guide plate 130 is disposed on the display module 110, wherein the light guide plate 130 has a first alignment through hole H1 and a first alignment mark M12 surrounding the first alignment through hole H1. The first alignment mark M12 of the light guide plate 130 is aligned with the auxiliary alignment mark AM of the display module 110 so that the first alignment through hole H1 of the light guide plate 130 is aligned with the through hole H of the display module 110. A touch sensing layer 160 is disposed on the light guide plate 130, wherein the touch sensing layer 160 has a second alignment through hole H22 and a second alignment mark M22 surrounding the second alignment through hole H22. The second alignment mark M22 of the touch sensing layer 160 is aligned with the first alignment mark M12 of the light guide plate 130, so that the second alignment through hole H22 is aligned with the first alignment through hole H1. An anti-glare layer 180 is disposed on the touch sensing layer 160. The anti-glare layer 180 has a third alignment through hole H3 and a third alignment mark M3 surrounding the third alignment through hole H3. Align the third alignment mark M3 with the second alignment mark M22 so that the third alignment through hole H3 is aligned with the second alignment through hole H22 Bit.

In some embodiments, the manufacturing method further includes arranging the light source LS beside the side surface S of the light guide plate 130. In some embodiments, the manufacturing method further includes bonding the display module 110 and the light guide plate 130 with a first adhesive layer 120, wherein the first adhesive layer 120 has through holes aligned with the first alignment through holes H1 and the through holes H h1. In some embodiments, the manufacturing method further includes bonding the light guide plate 130 and the touch sensing layer 160 with a second adhesive layer 140, wherein the second adhesive layer 140 has a first alignment through hole H1 and a second alignment through hole H22 aligned through hole h2. In some embodiments, the manufacturing method further includes bonding the touch sensing layer 160 and the anti-glare layer 180 with a third adhesive layer 170, wherein the third adhesive layer 170 has the second alignment via H22 and the third alignment via H22 Hole H3 is aligned with through hole h3.

FIG. 4C is a schematic top view of the display device 400 shown in FIG. 4A. Please refer to Figures 4B and 4C at the same time, by aligning the second alignment mark M22 with the first alignment mark M12, that is, make the sharp corners of the second alignment mark M22 and the diamond shape of the first alignment mark M12 The patterns are aligned, the second alignment through hole H22 of the touch sensing layer 160 can be aligned with the first alignment through hole H1 of the light guide plate 130; by aligning the third alignment mark M3 with the first alignment mark M12 That is, the sharp corners of the third alignment mark M3 are aligned with the diamond pattern of the first alignment mark M12, and the third alignment through hole H3 of the anti-glare layer 180 can also be aligned with the first alignment of the light guide plate 130 Through hole H1 is aligned. The above-mentioned alignment method can improve the alignment accuracy of the second alignment through hole H22 of the touch sensing layer 160 and the first alignment through hole H1 of the light guide plate 130, and can also improve the third alignment of the anti-glare layer 180 The alignment accuracy of the through hole H3 and the first alignment through hole H1 of the light guide plate 130.

In addition, in another embodiment of the present invention, the display module 110 further includes a light-emitting display layer. The light-emitting display layer is, for example, an OLED. For example, when the OLED is located under the EPD and used as a light-emitting display layer, the light guide plate 130 and the light source LS on its side can be omitted, and the touch sensing layer or the anti-glare layer can be directly attached to the display module 110 surface.

In summary, by providing alignment marks on the optical layers such as the light guide layer, the touch sensing layer, and the anti-glare layer, the alignment accuracy of the optical layer and the through hole of the display module can be improved. In addition, the alignment between the through holes will not be affected by the shape difference between the display module and the optical layer. Therefore, the manufacturing method described in the present disclosure is particularly suitable for manufacturing non-square display devices.

Although the present invention has been disclosed in the above embodiments, the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Anyone who is familiar with the art can do it without departing from the spirit and scope of the present invention. Various equal changes and modifications shall fall within the scope of the present invention, so the scope of protection of the present invention shall be subject to those defined by the attached patent application.

400‧‧‧Display device

110‧‧‧Display Module

120‧‧‧First adhesive layer

130‧‧‧Light guide plate

140‧‧‧Second adhesive layer

160‧‧‧Touch sensor layer

170‧‧‧The third adhesive layer

180‧‧‧Anti-glare layer

AM‧‧‧Auxiliary registration mark

H, h1, h2, h3‧‧‧through hole

H1‧‧‧The first through hole

H22‧‧‧Second Alignment Through Hole

H3‧‧‧Third Alignment Through Hole

IR‧‧‧Invisible area

LS‧‧‧Light source

LR‧‧‧Light guide spot area

M12‧‧‧First alignment mark

M22‧‧‧Second alignment mark

M3‧‧‧The third alignment mark

NLR‧‧‧No light guide spot area

S‧‧‧ side

VR‧‧‧Viewing area

Claims (12)

A display device includes: a display module having a through hole; and a first optical layer located on the display module and having a first alignment through hole aligned with the through hole and surrounding the first optical layer A first alignment mark of an alignment through hole, wherein the first alignment mark includes a ring pattern surrounding the first alignment hole and a plurality of directional marks, and the directional marks are substantially arranged in the ring pattern Around and pointing to the first through hole. The display device according to claim 1, further comprising a light source disposed beside a side surface of the first optical layer, and the first optical layer is a light guide plate. The display device according to claim 1, further comprising a second optical layer on the first optical layer, the second optical layer having a second alignment through hole that is aligned with the first alignment through hole and A second alignment mark surrounding the second alignment through hole, wherein the first alignment mark is aligned with the second alignment mark. The display device according to claim 3, wherein the first optical layer is a light guide plate, and the second optical layer is an anti-glare layer or a touch sensing layer. The display device according to claim 3, further comprising a third optical layer on the second optical layer, the third optical layer having a third alignment through hole that is aligned with the second alignment through hole and Around the third counterpoint A third alignment mark of the hole, wherein the second alignment mark is aligned with the third alignment mark, the first optical layer is a light guide plate, the second optical layer is a touch sensing layer, and the third The optical layer is an anti-glare layer. The display device according to claim 1, wherein the display module includes a visible area and a non-visible area, the visible area surrounds the non-visible area, and the through hole is located in the non-visible area. The display device according to claim 1, wherein the display module further includes a light-emitting display layer. A method for manufacturing a display device includes: receiving a display module; forming a through hole on the display module; marking an auxiliary alignment mark on the periphery of the through hole; arranging a first optical layer on the display module, The first optical layer has a first alignment through hole and a first alignment mark surrounding the first alignment through hole, wherein the first alignment mark includes a ring pattern surrounding the first alignment through hole And a plurality of directional marks, the directional marks are substantially arranged around the ring pattern and point to the first alignment through hole; and the first alignment mark is aligned with the auxiliary alignment mark, so that the The first alignment through hole is aligned with the through hole. The manufacturing method according to claim 8, further comprising: disposing a second optical layer on the first optical layer, the second optical layer Having a second alignment through hole and a second alignment mark surrounding the second alignment through hole; and aligning the second alignment mark with the first alignment mark so that the second alignment mark The through hole is aligned with the first aligned through hole. The manufacturing method according to claim 9, further comprising: disposing a third optical layer on the second optical layer, the third optical layer having a third aligning through hole and surrounding the third aligning through hole A third alignment mark; and the third alignment mark is aligned with the second alignment mark, so that the third alignment through hole is aligned with the second alignment through hole. The manufacturing method according to claim 8, further comprising: arranging a light source on a side surface of the first optical layer. The manufacturing method according to claim 8, wherein the method of forming the through hole is laser cutting.

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