WO2019218852A1 - 导光结构及其制造方法、背光模组及显示装置 - Google Patents

导光结构及其制造方法、背光模组及显示装置 Download PDF

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Publication number
WO2019218852A1
WO2019218852A1 PCT/CN2019/084347 CN2019084347W WO2019218852A1 WO 2019218852 A1 WO2019218852 A1 WO 2019218852A1 CN 2019084347 W CN2019084347 W CN 2019084347W WO 2019218852 A1 WO2019218852 A1 WO 2019218852A1
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WO
WIPO (PCT)
Prior art keywords
light guiding
layer
dots
light
pits
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PCT/CN2019/084347
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English (en)
French (fr)
Inventor
王涛
Original Assignee
京东方科技集团股份有限公司
京东方光科技有限公司
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Priority to US16/618,299 priority Critical patent/US11150397B2/en
Publication of WO2019218852A1 publication Critical patent/WO2019218852A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces

Definitions

  • Embodiments of the present disclosure relate to a light guiding structure, a method of fabricating the same, a backlight module, and a display device.
  • Light Guide Plate is a main component that converts point light source or line light source into surface light source in small and medium-sized back light source. It can be applied to flat display such as liquid crystal display, notebook computer, digital camera, monitor and projector. In the device, it is used to provide a surface light source with uniform brightness, so that the flat display device can display images normally.
  • a mesh point is usually arranged on the surface (such as the upper surface, the lower surface or the side surface) of the light guide plate to improve the uniformity of the light output of the light guide plate, but how to form a mesh point inside the light guide plate still has difficulties.
  • a light guiding structure comprising: at least two light guiding layers; and a plurality of dots disposed between adjacent light guiding layers.
  • the number of the at least two light guiding layers is N
  • the light guiding structure includes the plurality of mesh points of the N-1 layer
  • N is a positive integer greater than or equal to 2.
  • the at least two light guiding layers include a first light guiding layer and a second light guiding layer; the first light guiding layer has a plurality of first faces on a first inner surface facing the second light guiding layer a second light guiding layer having a plurality of second pits on the first inner surface facing the first light guiding layer, the plurality of first pits and the plurality of second pits The locations correspond to and constitute the plurality of dots.
  • the at least two light guiding layers include a first light guiding layer, a second light guiding layer and a third light guiding layer;
  • the first light guiding layer is on a first inner surface facing the second light guiding layer Having a plurality of first pits thereon, the second light guiding layer having a plurality of second pits on the first inner surface facing the first light guiding layer, the plurality of first pits and the a plurality of second pits corresponding to each other and constituting the plurality of dots;
  • the second light guiding layer having a plurality of third pits on a second inner surface facing the third light guiding layer,
  • the third light guiding layer has a plurality of fourth pits on a first inner surface facing the second light guiding layer, and the positions of the plurality of third pits and the plurality of fourth pits correspond to each other The plurality of dots are formed.
  • the plurality of dots are equal in size, the degree of density is not equal, the plurality of dots are densified as the distance from the light source becomes larger, and the light guiding structure is configured to receive and transmit light from the light source .
  • the plurality of dots have the same degree of density, and the sizes are unequal, the plurality of dots become larger as the distance from the light source becomes larger, and the light guiding structure is configured to receive and transmit from the light source. Light.
  • a softening layer is disposed at a position other than the plurality of dots between the adjacent light guiding layers.
  • the material of the at least two light guiding layers is a transparent resin
  • the material of the softening layer is a transparent ceramic material or a transparent polymer composite.
  • the light guiding structure has a thickness of 0.2 mm to 6 mm.
  • each of the plurality of dots is a symmetrical structure with respect to a contact surface between the adjacent light guiding layers.
  • a cross-sectional shape of each of the plurality of mesh dots is a circle, and the diameter of the circular shape is 10 ⁇ m to 200 ⁇ m.
  • each of the plurality of dots is a cavity.
  • a backlight module including the light guiding structure as described above is provided.
  • a backlight module further includes a reflective coating disposed on a surface of the light guiding structure.
  • the reflective coating is a white ink or white lacquer and has a thickness of 0.02 to 0.07 mm.
  • a display device including the backlight module as described above, and a display panel located on a light exiting side of the backlight module.
  • a method of fabricating a light guiding structure includes forming at least two light guiding layers; and forming a plurality of dots between adjacent light guiding layers.
  • the manufacturing method of the light guiding structure includes: forming a first light guiding layer and a second light guiding layer; forming a plurality of first pits on the first light guiding layer, and forming a plurality of holes on the second light guiding layer a second pit, a first softening layer is formed at a position of the first light guiding layer except the plurality of first pits, and the second light guiding layer is apart from the plurality of second Forming a second softening layer at a position other than the pit; pressing the first light guiding layer and the second light guiding layer; performing a heat treatment to soften the first softening layer and the second softening layer to The first light guiding layer and the second light guiding layer are connected together.
  • the plurality of dots are formed between adjacent light guiding layers by laser ablation.
  • the method further includes concentrating the laser using a convex lens.
  • FIG. 1a is a schematic structural view showing a light guiding structure according to an embodiment of the present disclosure.
  • FIG. 1b is a schematic structural view showing a light source located at a side of a light guiding structure provided by an embodiment of the present disclosure.
  • FIG. 1c is a schematic structural view showing that the light source is located below the light guiding structure provided by the embodiment of the present disclosure.
  • FIG. 2 is a schematic structural view showing a light guiding structure according to an embodiment of the present disclosure before being pressed.
  • FIG. 2b is a schematic structural view showing a light guiding structure according to an embodiment of the present disclosure.
  • FIG. 3 is a flow chart showing a method of fabricating a light guiding structure according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic view showing another manufacturing method of a light guiding structure provided by an embodiment of the present disclosure.
  • FIG. 5 is another schematic structural diagram showing a light guiding structure according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural view showing a light guiding structure according to an embodiment of the present disclosure before being pressed.
  • FIG. 7 is a schematic diagram showing a backlight module according to an embodiment of the present disclosure.
  • FIG. 1a is a schematic diagram of a light guiding structure provided by an embodiment of the present disclosure.
  • the light guiding structure may be a light guide plate or a light guiding film.
  • the light guiding structure comprises: at least two layers of light guiding layers 1, and a plurality of dots 2 are disposed between adjacent light guiding layers.
  • each of the plurality of dots 2 has a symmetrical structure with respect to a contact face between adjacent light guiding layers 1. This simplifies the design and is easy to machine.
  • each of the plurality of dots 2 in a direction perpendicular to the light guiding structure, has a circular cross section shape.
  • the cross-sectional shape of each of the plurality of dots 2 may be any suitable shape such as an ellipse, a rectangle, or the like in a direction perpendicular to the light guiding structure.
  • each of the plurality of dots 2 is a cavity.
  • the light guiding structure is formed by at least two light guiding layers, and a plurality of mesh points are disposed between the adjacent light guiding layers, so that the dots of the light guiding structure are arranged.
  • the product display yield can be improved; on the other hand, the light guiding structure composed of the multi-layer light guiding layer can improve the shielding property of the product, and can also improve the light effect and achieve the high brightness effect.
  • the light guiding structure including the two light guiding layers will be taken as an example, and the light guiding structure in the embodiment of the present disclosure will be described in detail in conjunction with FIGS. 1a-1c and 2a-2b.
  • the light guiding structure includes two layers of light guiding layers 1, and a plurality of dots 2 are disposed between adjacent light guiding layers 1.
  • FIG. 2a is a schematic structural view of a light guiding structure provided by an embodiment of the present disclosure before pressing.
  • the light guiding structure includes a first light guiding layer 7 and a second light guiding layer 8, and the first light guiding layer 7 has a plurality of first faces on the first inner surface S1 facing the second light guiding layer 8.
  • a pit 5 the second light guiding layer 8 has a plurality of second pits 6 on the first inner surface S2 facing the first light guiding layer 7, a plurality of first pits 5 and a plurality of second pits 6 The location corresponds.
  • the plurality of first pits 5 and the plurality of second pits 6 are respectively aligned with each other in a one-to-one manner to form a plurality of dots, that is, Point 2 in Figure 1.
  • the first pit 5 and the second pit 6 are, for example, semicircular. As shown in FIG. 2a, the first pit 5 is a semicircle having only the upper half, and the second pit 6 is a semicircle having only the lower half, and the first light guiding layer 7 and the second light guiding layer are After joining each other, the two semi-circular centers coincide to form a complete circular dot.
  • a semicircular pit can be conveniently formed on the light guiding layer by means of a laser or the like.
  • the material of the first light guiding layer 7 and the second light guiding layer 8 may be a transparent resin or other transparent material.
  • the light guiding layer and the pits thereon can be formed by injection molding.
  • first light guiding layer 7 and the second light guiding layer 8 are pressed together to form the light guiding structure shown in FIG. 1a.
  • a first softening layer 41 is disposed on the first inner surface S1 of the first light guiding layer 7, and the first softening layer 41 is located in a space between the plurality of first pits 5, and the second light guiding layer 8
  • the first inner surface S2 is provided with a second softening layer 42
  • the second softening layer 42 is located at a spacing region between the plurality of second pits 6, and the first softening layer 41 and the second softening layer 42 are pressed and heated. It is then formed in one body to obtain a softened layer 4.
  • the light guiding structure shown in Fig. 2b is obtained.
  • the light guiding structure shown in Fig. 2b differs from the light guiding structure shown in Fig. 1a in that a softening layer 4 is provided at a position other than the plurality of dots 2 between adjacent light guiding layers.
  • the material of the first softening layer 41 and the second softening layer 42 may be a transparent ceramic material, a transparent polymer composite material or the like which is transparent and can be changed into a molten state after being heated.
  • the softening layer may be formed by performing overmolding after the light guiding layer is formed, or may be coated on the surface of the light guiding layer and then left by the etching process to retain the film layer, that is, in the concave layer.
  • the spacer region between the dots forms a softened layer.
  • the softened layer becomes molten after heating, so that the two light guiding layers can be attached and fixed together after heating, and the interface formed by directly bonding the two light guiding layers together is avoided, and the two are softened by heating.
  • the light guiding layer can be integrally formed after being bonded to reduce optical energy loss caused by the interface between different light guiding layers.
  • each of the plurality of dots 2 has a circular cross section, and the circular diameter has a diameter of 10 ⁇ m to 200 ⁇ m. Since the size of the dots between the adjacent light guiding layers is uniform, the uniformity of the image can be improved, the difficulty of the optical design is reduced, and the processing is easy.
  • the diameter can be selected according to the demand, for example, in the field of mobile phone (SP), flat panel (TPC), vehicle, industrial control, etc., the diameter of the dot can be selected from 10 to 50 ⁇ m. For example, in the fields of display (MNT) and television (TV), the diameter of the dot can be selected from 50 to 200 ⁇ m.
  • the light directing structure is configured to receive and transmit light from a light source.
  • the distribution of the dots can be set according to the distance from the dot to the light source. As the distance from the dot to the light source becomes larger, the density of the dots becomes denser, that is, the farther away from the light source, the denser the dots, and the closer the light source is, the more sparse the dots are. In this way, by adapting the distance from the dot to the light source to adjust the density of the dot, the problem of excessive brightness of the region near the light source can be solved, thereby improving the uniformity of the display image.
  • the light source 10 includes a direct type or a side entry type.
  • the light source 10 is of a side-in type, and the light source 10 is disposed at a side of the light guiding structure, and the density of the dots is gradually reduced from the edge to the center of the light guiding structure.
  • the light source 10 is of a direct type, and the light source 10 is disposed at the bottom of the light guiding structure, and the density of the dots is gradually increased from the edge to the center of the light guiding structure.
  • the density of dots is the same, but the sizes of the dots are not equal.
  • dots of different sizes can be set according to the distance from the dot to the light source. As the distance from the dot to the light source becomes larger, the farther away from the light source, the larger the dot, the closer the light source is, the smaller the dot is. In this way, the size of the dot can be adaptively adjusted by the distance from the dot to the light source, and the problem that the brightness of the region near the light source is too high can be improved, thereby improving the uniformity of the display screen.
  • the light source 10 includes a direct type or a side entry type. As shown in FIG.
  • the light source 10 is of a side-in type, and the light source 10 is disposed at a side of the light guiding structure, and the size of the dot changes from the edge of the light guiding structure to the center, that is, the closer the light source is, the smaller the dot is. The farther away from the light source, the larger the dot.
  • the light source 10 is of a direct type, and the light source 10 is disposed at the bottom of the light guiding structure.
  • the size of the dot changes from the edge of the light guiding structure to the center, that is, the dot area directly above the light source 10 is small.
  • the dot point away from the edge region of the light source 10 is large.
  • FIG. 1a-1c and FIG. 2a-2b only the structural diagram of the dot located inside the light guiding structure is shown, and the change of the density of the dot is not shown, but in actual use, the dot needs to be needed according to the need. Adjust the density and size.
  • the light guiding structure in the embodiment of the present disclosure is applicable to a light guide plate or a light guiding film having a thickness of 0.2 mm to 6 mm.
  • the thickness of the light guide plate or the light guiding film is 0.2 mm to 0.5 mm; when applied to the field of flat panel (TPC), vehicle, industrial control, etc., the thickness of the light guide plate or the light guiding film is 0.5.
  • the thickness of the light guide plate or light guide film is 1.5mm ⁇ 3.0mm; when used in industrial control and television (TV) and other fields, the light guide plate or The thickness of the light guiding film is from 3.0 mm to 6.0 mm.
  • the light guiding structure shown in FIGS. 1a-1c and 2a-2b includes two light guiding layers, so that the shielding performance of the light guiding structure is better than that of the single layer light guiding layer in the conventional technology, and the product image is improved. Yield.
  • the product picture yield of the traditional single-layer light guide layer is 85%, and the product picture yield of the two-layer light guide layer can be increased to 92% or more.
  • the duty ratio of the dot is greatly improved, and the light efficiency improvement can reach 30% or more.
  • the light guiding structure in the embodiment of the present disclosure is not limited to the light guide plate, but may be other transparent components or products.
  • the light guiding structure provided by the embodiment of the present disclosure constitutes a light guiding structure by at least two light guiding layers, and a plurality of mesh points are disposed between adjacent light guiding layers to realize a light guiding structure.
  • the dot is disposed inside the light guiding structure to improve the product display yield; on the other hand, the light guiding structure formed by the plurality of light guiding layers can improve the shielding property of the product, and can also improve the light effect and achieve the high brightness effect.
  • an embodiment of the present disclosure further provides a method of fabricating a light guiding structure, comprising: forming at least two light guiding layers 1; and forming a plurality of dots 2 between adjacent light guiding layers 1.
  • a method of manufacturing a light guiding structure includes:
  • step S31 the formation of the first light guiding layer and the second light guiding layer is performed, for example, by injection molding.
  • a first pit is formed on the first light guiding layer
  • a second pit is formed on the second light guiding layer
  • a plurality of first in the first light guiding layer A first softening layer is formed at a position other than the pit
  • a second softening layer is formed at a position of the second light guiding layer other than the plurality of second pits.
  • pits may be formed on the light guiding layer by injection molding, and pits may be formed on the light guiding layer by coating, etching, or the like.
  • the pits may be semi-circular, and may be designed in other shapes as needed. Semi-circular pits are easier to machine if processed by laser drilling or the like.
  • the embodiment of the present disclosure does not limit the order in which the first and second pits and the first and second softening layers are formed.
  • the first pits and the second pits may be formed first, and then the first softening layer and the second softening layer are formed.
  • the first softening layer and the second softening layer may be formed first, and then the first pit and the second pit are formed.
  • step S33 the first light guiding layer and the second light guiding layer are pressed together.
  • the first pit and the second pit are symmetric with respect to a joint surface of the first light guiding layer and the second light guiding layer, and the first pit corresponds to the second pit one-to-one, due to the first pit and the second recess
  • the points are all semi-circular and can be pressed to form a complete circular dot.
  • step S34 a heat treatment is performed to soften the first softening layer and the second softening layer to connect the two light guiding layers together to avoid bonding between the two different light guiding layers.
  • the interfaces formed together are softened by heating so that the two different light guiding layers can be integrally formed after being bonded together, thereby reducing the optical energy loss caused by the interface between the different light guiding layers.
  • the heating temperature needs to be determined according to the material of the softening layer. For example, if the softening layer is a transparent ceramic material, the heating temperature is from 80 ° C to 100 ° C; if the softening layer is a transparent polymer composite, the heating temperature is from 100 ° C to 110 ° C.
  • the softened layer is heated to a molten state, and after the normal temperature is restored, the first light guiding layer and the second light guiding layer are integrally formed, and the dots are formed inside the light guiding structure.
  • the light guiding structure shown in Fig. 2b is obtained by the steps shown in Fig. 3.
  • a light guiding structure having a built-in dot can also be formed by using a laser.
  • a laser is collected by a convex lens to form a plurality of lasers by ablation inside the light guiding structure. Outlets.
  • the focus of the convex lens is located at a position inside the light guiding structure where a halftone dot is to be formed.
  • this method is difficult to adjust optically; and the thickness of the light guiding structure suitable for this method is at least 1.0 mm or more, and the thinner light guide plate or light guiding film cannot be realized in this manner.
  • FIG. 5 is another schematic diagram of a light guiding structure according to an embodiment of the present disclosure.
  • the light guiding structure may be a light guiding plate or a light guiding film.
  • the light guiding structure includes three light guiding layers 1, and a plurality of mesh points 2 are disposed between each adjacent light guiding layer, and two layers of dots are shared between the three light guiding layers 1.
  • FIG. 6 is a schematic structural view of a light guiding structure according to an embodiment of the present disclosure before pressing.
  • the light guiding structure includes a first light guiding layer 7, a second light guiding layer 8, and a third light guiding layer 9, and the first light guiding layer 7 is on the first inner surface facing the second light guiding layer 8.
  • the second light guiding layer 8 has a plurality of second pits 5' on the first inner surface S2 facing the first light guiding layer 7, a plurality of first pits 5 and The positions of the plurality of second pits 5' correspond to each other and after the first light guiding layer 7 and the second light guiding layer 8 are pressed together to form a plurality of dots, that is, the dots of the upper layer in FIG.
  • the second light guiding layer 8 has a plurality of third pits 6 on the second inner surface S3 facing the third light guiding layer 9 , and the third light guiding layer 9 is on the first inner surface S4 facing the second light guiding layer 8 .
  • the material of the light guiding layer, the material of the softening layer, the size of the dots, and the degree of density of the dots are the same as those of the above-mentioned FIG. 1 and FIG. 2, and are not described herein again.
  • the positions of the dot distributions in the two layers of dots do not have to be one-to-one correspondence, and the size of the dots in different layers or The degree of density may also be different.
  • the density of the layer of dots near the light source is smaller than the density of the layer of dots away from the light source, and the like.
  • the size of the layer of dots near the light source is smaller than the size of the layer of dots away from the light source, and the like.
  • the light guiding structure shown in FIG. 5 and FIG. 6 includes three light guiding layers, so that the shielding performance of the light guiding structure is better than that of the single layer or the double layer light guiding layer, and the picture yield of the product is improved.
  • the product picture yield of the traditional single-layer light guiding layer is 85%
  • the product picture yield of the two-layer light guiding layer can reach 92% or more
  • the product picture yield of the three-layer light guiding layer can reach more than 95%.
  • multiple layers of dots can be disposed inside the light guiding structure.
  • the light guiding structure may include a plurality of dots of the N-1 layer.
  • the structure is similar to that of FIG. 5 and FIG. 6 described above, and the light guiding layer having the concave points needs to be pressed and integrated by the softening layer to realize the internal dots.
  • the light guiding structure is not listed here. How many layers of light guiding layer are disposed in the light guiding structure also needs to be selected in combination with specific design requirements, such as the thickness of the light guiding structure, the number of layers of the dot, and the display yield.
  • the light guide plate provided by the embodiment of the present disclosure constitutes a light guiding structure by at least two light guiding layers, and a plurality of mesh points are disposed between adjacent light guiding layers to realize a light guiding structure.
  • the dot is disposed inside the light guiding structure to improve the product display yield; on the other hand, the light guiding structure formed by the plurality of light guiding layers can improve the shielding property of the product, and can also improve the light effect and achieve the high brightness effect.
  • the light guiding structure of the multi-layer light guiding lamination together greatly improves the duty ratio of the dot (ie, the ratio of the total area of the dot to the total area of the light guiding layer), and the light efficiency is improved by more than 30%.
  • FIG. 7 is a schematic diagram of a backlight module according to an embodiment of the present disclosure.
  • the backlight module includes: the light guiding structure described above and the reflective coating 3 disposed on the surface of the light guiding structure.
  • the reflective coating in the embodiments of the present disclosure may be white ink or white lacquer, and has a thickness of, for example, 0.02 to 0.07 mm.
  • the coating acts like a reflective sheet to improve light utilization.
  • the reflective coating 3 disposed on the surface of the light guiding structure may be replaced by a reflective sheet, but the thickness of the reflective sheet is at least 0.07 mm.
  • the backlight module also includes the light source 10 as described above.
  • the backlight module in FIG. 7 can achieve the same technical effects as the above-described light guiding structure, and details are not described herein again.
  • the embodiment of the present disclosure further provides a display device, including the backlight module and the display panel, wherein the display panel is located on the light emitting side of the backlight module, and the display device can achieve the same technical effect as the light guiding structure and the backlight module. , will not repeat them here.
  • the display device may be any product or component having a display function such as a display panel, an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display function such as a display panel, an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.

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Abstract

一种导光结构及其制造方法、背光模组及显示装置。导光结构包括：至少两层导光层(1)；以及设置在相邻的导光层(1)之间的多个网点(2)。一方面，导光结构的网点(2)设置在导光结构内部，可以提高产品显示良率；另一方面，由多层导光层(1)构成导光结构可以提升产品的遮蔽性，还可以提升光效，达到高亮度的效果。

Description

导光结构及其制造方法、背光模组及显示装置
本申请要求于2018年5月18日递交的第201820746891.9号中国专利申请的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开的实施例涉及一种导光结构及其制造方法、背光模组及显示装置。
背景技术
导光板(Light Guide Plate，LGP)是中小型背面光源中将点光源或线光源转化为面光源的主要部件，可应用于液晶显示器、笔记型电脑、数码相机、监视器以及投影仪等平面显示设备中，用于提供亮度均匀的面光源，使平面显示设备能够正常显示影像。
在导光板制作过程中，通常会在导光板的表面(如上表面、下表面或侧面)设置网点，以提高导光板出光的均匀程度，但如何在导光板内部制作形成网点仍存在难点。
发明内容
根据本公开的实施例，提供一种导光结构，包括：至少两层导光层；以及设置在相邻的导光层之间的多个网点。
例如，所述至少两层导光层的数目为N，导光结构包括N-1层的所述多个网点，N为大于或等于2的正整数。
例如，所述至少两层导光层包括第一导光层和第二导光层；所述第一导光层在朝向所述第二导光层的第一内表面上具有多个第一凹点，所述第二导光层在朝向所述第一导光层的第一内表面上具有多个第二凹点，所述多个第一凹点和所述多个第二凹点的位置相对应并构成所述多个网点。
例如，所述至少两层导光层包括第一导光层、第二导光层和第三导光层；所述第一导光层在朝向所述第二导光层的第一内表面上具有多个第一凹点， 所述第二导光层在朝向所述第一导光层的第一内表面上具有多个第二凹点，所述多个第一凹点和所述多个第二凹点的位置相对应并构成所述多个网点；所述第二导光层在朝向所述第三导光层的第二内表面上具有多个第三凹点，所述第三导光层在朝向所述第二导光层的第一内表面上具有多个第四凹点，所述多个第三凹点和所述多个第四凹点的位置相对应并构成所述多个网点。
例如，所述多个网点的大小相等，疏密程度不等，随着到光源的距离变大所述多个网点变密，并且所述导光结构构造为接收并传输来自所述光源的光。
例如，所述多个网点的疏密程度相同，大小不等，随着到所述光源的距离变大所述多个网点变大，并且所述导光结构构造为接收并传输来自所述光源的光。
例如，在所述相邻的导光层之间的除所述多个网点之外的位置处设置有软化层。
例如，所述至少两层导光层的材料为透明树脂，所述软化层的材料为透明陶瓷类材料或透明高分子复合材料。
例如，所述导光结构的厚度为0.2mm～6mm。
例如，相对于所述相邻的导光层之间的接触面，所述多个网点的每个为对称结构。
例如，在垂直于所述导光结构的方向上，所述多个网点的每个的截面形状为圆形，且所述圆形的直径为10μm～200μm。
例如，所述多个网点的每个为空腔。
根据本公开的实施例，提供一种背光模组，包括如上所述的导光结构。
例如，根据本公开实施例的背光模组还包括反射涂层，设置在所述导光结构的表面。
例如，所述反射涂层为白色油墨或白漆，且厚度为0.02～0.07mm。
根据本公开的实施例，提供一种显示装置，包括如上所述的背光模组；以及显示面板，位于所述背光模组的出光侧。
根据本公开的实施例，提供一种导光结构的制造方法，包括形成至少两层导光层；以及在相邻的导光层之间形成多个网点。
例如，所述导光结构的制造方法包括：制作第一导光层和第二导光层； 在第一导光层上形成多个第一凹点，在第二导光层上形成多个第二凹点，在所述第一导光层的除所述多个第一凹点之外的位置处形成第一软化层，在所述第二导光层的除所述多个第二凹点之外的位置处形成第二软化层；对所述第一导光层和所述第二导光层进行压合；进行加热处理，使得第一软化层和第二软化层软化以将第一导光层和第二导光层连接在一起。
例如，通过激光烧蚀在相邻的导光层之间形成所述多个网点。
例如，在所述激光烧蚀之前，所述方法还包括采用凸透镜对激光进行汇聚。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1a是示出本公开实施例提供的导光结构的结构示意图。
图1b是示出光源位于本公开实施例提供的导光结构的侧部的结构示意图。
图1c是示出光源位于本公开实施例提供的导光结构的下方的结构示意图。
图2a是示出本公开实施例提供的导光结构压合前的结构示意图。
图2b是示出本公开实施例提供的导光结构压合后的结构示意图。
图3是示出本公开实施例提供的导光结构的制造方法的流程图。
图4是示出本公开实施例提供的导光结构的另一制造方法的示意图。
图5是示出本公开实施例提供的导光结构的另一结构示意图。
图6是示出本公开实施例提供的导光结构压合前的结构示意图。
图7是示出本公开实施例提供的背光模组的示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实 施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另作定义，此处使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现在“包括”或者“包含”前面的元件或者物件涵盖出现在“包括”或者“包含”后面列举的元件或者物件及其等同，并不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
图1a示出了本公开实施例提供的一种导光结构的示意图。例如，该导光结构可以是导光板，还可以是导光膜。如图1a所示，该导光结构包括：至少两层导光层1，相邻的导光层之间设置有多个网点2。
例如，相对于相邻的导光层1之间的接触面，多个网点2的每个为对称结构。这样，可以简化设计，易于加工。例如，在垂直于导光结构的方向上，多个网点2的每个的截面形状为圆形。然而，本公开实施例不局限于此，在垂直于导光结构的方向上，多个网点2的每个的截面形状可以为椭圆形、矩形等任何合适的形状。
例如，如图1a所示，多个网点2的每个为空腔。
根据本公开实施例提供的导光结构，一方面，通过至少两层导光层构成导光结构，并在相邻的导光层之间设置多个网点，实现导光结构的网点设置在导光结构内部，可以提高产品显示良率；另一方面，由多层导光层构成导光结构可以提升产品的遮蔽性，还可以提升光效，达到高亮度的效果。
接下来，将以导光结构包括两层导光层为例，并结合图1a-1c和图2a-2b对本公开实施例中的导光结构进行详细的说明。
例如，如图1a所示，导光结构包括两层导光层1，相邻的导光层1之间设置有多个网点2。
图2a示出本公开实施例提供的导光结构在压合前的结构示意图。如图 2a所示，导光结构包括第一导光层7和第二导光层8，第一导光层7在朝向第二导光层8的第一内表面S1上具有多个第一凹点5，第二导光层8在朝向第一导光层7的第一内表面S2上具有多个第二凹点6，多个第一凹点5和多个第二凹点6的位置相对应。将第一导光层7和第二导光层8彼此接合之后，多个第一凹点5和多个第二凹点6分别以一对一的方式彼此对合以形成多个网点，即图1中的网点2。
在本公开实施例中，第一凹点5和第二凹点6例如是半圆形。如图2a所示，第一凹点5为只有上半部分的半圆形，第二凹点6为只有下半部分的半圆形，在将第一导光层7和第二导光层8彼此接合之后这两部分半圆形的圆心重合以得到完整的圆形网点。利用激光等方式可以很方便地在导光层上形成半圆形的凹点。
例如，第一导光层7和第二导光层8的材料可以为透明树脂或其他透明材料。例如，导光层和其上的凹点可采用注塑方式形成。
例如，将第一导光层7和第二导光层8进行压合，形成图1a所示的导光结构。
例如，在第一导光层7的第一内表面S1上设置有第一软化层41，第一软化层41位于多个第一凹点5之间的间隔区域，第二导光层8的第一内表面S2上设置有第二软化层42，第二软化层42位于多个第二凹点6之间的间隔区域，且第一软化层41和第二软化层42经压合及加热后形成为一体以得到软化层4。由此，得到图2b所示的导光结构。图2b所示的导光结构与图1a所示的导光结构的差别在于，在相邻的导光层之间的除多个网点2之外位置处设置有软化层4。
例如，第一软化层41和第二软化层42的材料可以为透明陶瓷类材料、透明高分子复合材料等透明且受热后可变为熔融态的软化材料。
例如，软化层的成型方式可以是在导光层制作后进行二次注塑形成，也可以是在导光层表面先涂布再经刻蚀工艺保留凹点区域之外的膜层，即在凹点之间的间隔区域形成软化层。软化层在加热后变成熔融态，使得两个导光层在加热后能够贴合固定在一起，避免两个导光层之间直接贴合在一起而形成的界面，通过加热软化使得两个导光层贴合后可以形成为一体，减少因不同导光层之间的界面造成的光学能量损失。
例如，多个网点的大小相等。例如，在垂直于导光结构的方向上，多个网点2的每个的截面形状为圆形，且圆形的直径大小为10μm～200μm。由于相邻的导光层之间的网点大小一致，能够有助于提升画面的均匀性，并降低光学设计的难度，易于加工。另外，可以根据需求选择大小合适的直径，例如，在手机(SP)、平板(TPC)、车载、工控等领域，网点的直径可以选择10～50μm。例如，在显示器(MNT)和电视(TV)等领域，网点的直径可以选择50～200μm。
例如，多个网点的大小相等，疏密程度不等。例如，导光结构构造为接收并传输来自光源的光。例如，可以根据网点到光源的距离设置网点的分布。随着网点到光源的距离变大网点的疏密程度变密，即距离光源越远，网点越密集，距离光源越近，网点越稀疏。这样一来，通过网点到光源的距离适应性调整网点的疏密程度，可以解决光源附近的区域亮度过高的问题，从而可以提升显示画面的均匀性。如图1b和图1c所示，光源10包括直下式或侧入式。在图1b中，光源10为侧入式，光源10设置在导光结构的侧边，网点的疏密程度为从导光结构的边缘向中央逐渐由疏到密。在图1c中，光源10为直下式，光源10设置在导光结构的底部，网点的疏密程度为从导光结构的边缘向中央逐渐由密到疏。
例如，网点的疏密程度相同，但是网点的大小不等。例如，可以根据网点到光源的距离设置大小不同的网点。随着网点到光源的距离的变大而变大，即距离光源越远，网点越大，距离光源越近，网点越小。这样一来，通过网点到光源的距离适应性调整网点的大小，也可以改善光源附近的区域亮度过高的问题，从而可以提升显示画面的均匀性。如图1b和图1c所示，光源10包括直下式或侧入式。如图1b所示，光源10为侧入式，光源10设置在导光结构的侧边，网点的大小变化为从导光结构的边缘到中央逐渐变大，即距离光源越近，网点越小，距离光源越远，网点越大。如图1c所示，光源10为直下式，光源10设置在导光结构的底部，网点的大小变化为从导光结构的边缘到中央逐渐变小，即光源10正上方区域的网点较小，而远离光源10的边缘区域的网点较大。
需要说明的是，图1a-1c和图2a-2b中仅示出网点位于导光结构内部的结构示意，并未示出网点疏密程度的变化，但是在实际使用中需要根据需要对 网点的疏密、大小进行调整。
需要说明的是，本公开实施例中的导光结构适用于厚度在0.2mm～6mm的导光板或导光膜。例如，应用在手机(SP)领域时，导光板或导光膜的厚度为0.2mm～0.5mm；应用在平板(TPC)、车载、工控等领域时，导光板或导光膜的厚度为0.5mm～2.0mm；应用在显示器(MNT)和电视(TV)等领域时，导光板或导光膜的厚度为1.5mm～3.0mm；应用在工控和电视(TV)等领域时，导光板或导光膜的厚度为3.0mm～6.0mm。
图1a-1c和图2a-2b所示的导光结构包括两层导光层，使得导光结构的遮蔽性能较传统技术中的单层导光层的遮蔽性能更好，同时提升产品的画面良率。例如，传统单层导光层的产品画面良率达到85％，而两层导光层的产品画面良率可以提升到92％以上。另外，在本公开实施例中网点占空比大大提升，光效提升可以达到30％以上。
本公开实施例中的导光结构不仅限于导光板，还可以是其他透明的部件或产品。
综上所述，本公开实施例提供的导光结构，一方面，通过至少两层导光层构成导光结构，并在相邻的导光层之间设置多个网点，实现导光结构的网点设置在导光结构内部，可以提高产品显示良率；另一方面，由多层导光层构成导光结构可以提升产品的遮蔽性，还可以提升光效，达到高亮度的效果。
例如，本公开实施例还提供一种导光结构的制造方法，包括：形成至少两层导光层1；以及在相邻的导光层1之间形成多个网点2。
以图2b所示的导光结构为例，以下结合图3所示的导光结构的制作流程图介绍其制作方法。例如，导光结构的制造方法包括：
如图3所示，在步骤S31中，制作形成第一导光层和第二导光层，例如可以采用注塑方式形成。
如图3所示，在步骤S32中，在第一导光层上形成第一凹点，在第二导光层上形成第二凹点，并在第一导光层的除多个第一凹点之外的位置处形成第一软化层，在第二导光层的除多个第二凹点之外的位置处形成第二软化层。例如，可以采用注塑方式在导光层上形成凹点，还可以采用涂布、刻蚀等在导光层上形成凹点。例如，该凹点可以是半圆形，还可以根据需要设计为其他形状。如果采用激光打点等方式加工，半圆形的凹点更容易加工。本公开 实施例对形成第一和第二凹点以及第一和第二软化层的顺序不做限定。例如，可以先形成第一凹点和第二凹点，再形成第一软化层和第二软化层。例如，可以先形成第一软化层和第二软化层，再形成第一凹点和第二凹点。
如图3所示，在步骤S33中，对第一导光层和第二导光层进行压合。第一凹点和第二凹点关于第一导光层和第二导光层的结合面呈对称状态，第一凹点与第二凹点一一对应，由于第一凹点和第二凹点均是半圆形，经压合可以形成完整的圆形网点。
如图3所示，在步骤S34中，进行加热处理，使得第一软化层和第二软化层软化，以将两个导光层连接在一起，避免两个不同导光层之间贴合在一起而形成的界面，通过加热软化使得两个不同导光层贴合后可以形成为一体，减少因连个不同导光层之间的界面造成的光学能量损失。
对于加热温度需要根据软化层的材料来确定。例如，如果软化层是透明陶瓷类材料，则加热温度在80℃～100℃；如果软化层是透明高分子复合材料，则加热温度在100℃～110℃。经加热使软化层变为熔融态，在恢复常温后使第一导光层和第二导光层形成为一体，网点形成在导光结构的内部。
经图3所示步骤制作得到上述图2b所示的导光结构。
例如，在本公开至少一个实施例中，还可以采用激光的方式制作形成具有内置网点的导光结构，如图4所示，利用凸透镜汇集激光使得激光在导光结构内部通过烧蚀形成多个网点。如图4所示，凸透镜的焦点位于导光结构内部的要形成网点的位置处。但这种方式光学调整难度较大；且适用此方式的导光结构厚度至少在1.0mm以上，对于更薄一些的导光板或导光膜无法利用这种方式实现。
图1a-1c和图2a-2b以及相关描述仅是以两层导光层为例，在本公开至少一个实施例中导光结构中还可以包括三层甚至三层以上的导光层。接下来，将以导光结构中包括三层导光层为例，并结合图3和图6对本公开实施例中的导光结构进行详细的说明。
图5示出本公开实施例提供的导光结构的另一示意图，该导光结构可以是导光板，还可以是导光膜。如图5所示，导光结构包括三层导光层1，每相邻的导光层之间设置有多个网点2，三层导光层1之间共有两层网点。
图6示出本公开实施例提供的导光结构的压合前的结构示意图。如图6 所示，导光结构包括第一导光层7、第二导光层8和第三导光层9，第一导光层7在朝向第二导光层8的第一内表面S1上具有多个第一凹点5，第二导光层8在朝向第一导光层7的第一内表面S2上具有多个第二凹点5'，多个第一凹点5和多个第二凹点5'的位置相对应并在第一导光层7和第二导光层8压合之后构成多个网点，即图5中上层的网点。第二导光层8在朝向第三导光层9的第二内表面S3上具有多个第三凹点6，第三导光层9在朝向第二导光层8的第一内表面S4上具有多个第四凹点6'，多个第三凹点6和多个第四凹点6'的位置相对应并在第二导光层8和第三导光层9压合之后构成多个网点，即图5中下层的网点。
例如，导光层的材料、软化层的材料以及网点的大小以及网点的疏密程度均同上述图1和图2的介绍，此处不再赘述。
需要说明的是，在图5和图6所示的导光结构中，由于存在两层网点，这两层网点中的网点分布的位置不必是一一对应的，而且不同层中网点的大小或疏密程度也可以是不同的，例如，如果光源是直下式(即光源设置在导光结构的底部)，则靠近光源的那一层网点的密度小于远离光源的那一层网点的密度等等，和/或则靠近光源的那一层网点的大小小于远离光源的那一层网点的大小等等。对于同一层网点中网点的大小以及疏密程度参照上述介绍，此处不再赘述。
图5和图6所示的导光结构包括三层导光层，使得导光结构的遮蔽性能较单层或双层导光层的遮蔽性能更好，同时提升产品的画面良率。例如，传统单层导光层的产品画面良率达到85％，两层导光层的产品画面良率可以达到92％以上，而三层导光层的产品画面良率可以达到95％以上。
基于上述图1-图6，可以在导光结构内部设置多层网点，例如：如果包含两层网点则需要堆叠三层导光层；如果包含三层网点则需要堆叠四层导光层……以此类推，也就是，至少两层导光层的数目为N，则导光结构可以包括N-1层的多个网点。当导光结构中的导光层的数目更多时，结构与上述图5和图6类似，需要将具有凹点的导光层进行压合，并通过软化层加热融合为一体，实现内部网点的导光结构，此处不再一一列举。对于在导光结构中设置多少层导光层还需结合具体的设计需求，如导光结构的厚度、网点的层的数目、显示良率等需求进行选择。
综上所述，本公开的实施例提供的导光板，一方面，通过至少两层导光层构成导光结构，并在相邻的导光层之间设置多个网点，实现导光结构的网点设置在导光结构内部，可以提高产品显示良率；另一方面，由多层导光层构成导光结构可以提升产品的遮蔽性，还可以提升光效，达到高亮度的效果。另外，多层导光层压合在一起的导光结构大大提升了网点的占空比(即网点总面积与导光层总面积的比值)，光效提升30％以上。
图7示出本公开实施例提供的一种背光模组的示意图。如图7所示，背光模组包括：以上所述的导光结构和设置在导光结构表面的反射涂层3。
在本公开实施例中的反射涂层为可以白色油墨或白漆，厚度例如0.02～0.07mm。该涂层可以起到类似反射片的作用，可提高光利用率。
继续参见图7所述的背光模组，除了包括以上所述的导光结构，设置在导光结构表面的反射涂层3还可以用反射片代替，但反射片的厚度为至少0.07mm。
例如，背光模组还包括如上所述的光源10。
图7中的背光模组能够实现与上述导光结构相同的技术效果，此处不再赘述。
本公开实施例还提供一种显示装置，包括上述背光模组和显示面板，其中显示面板位于背光模组的出光侧，且该显示装置能够实现与上述导光结构和背光模组相同的技术效果，此处不再赘述。
例如，该显示装置可以为：显示面板、电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上所述仅是本公开的示范性实施方式，而非用于限制本公开的保护范围，本公开的保护范围由所附的权利要求确定。

Claims (20)

  1. 一种导光结构，包括：
    至少两层导光层；以及
    设置在相邻的导光层之间的多个网点。
  2. 根据权利要求1所述的导光结构，其中，所述至少两层导光层的数目为N，导光结构包括N-1层的所述多个网点，N为大于或等于2的正整数。
  3. 根据权利要求2所述的导光结构，其中，
    所述至少两层导光层包括第一导光层和第二导光层；
    所述第一导光层在朝向所述第二导光层的第一内表面上具有多个第一凹点，所述第二导光层在朝向所述第一导光层的第一内表面上具有多个第二凹点，所述多个第一凹点和所述多个第二凹点的位置相对应并构成所述多个网点。
  4. 根据权利要求2所述的导光结构，其中，
    所述至少两层导光层包括第一导光层、第二导光层和第三导光层；
    所述第一导光层在朝向所述第二导光层的第一内表面上具有多个第一凹点，所述第二导光层在朝向所述第一导光层的第一内表面上具有多个第二凹点，所述多个第一凹点和所述多个第二凹点的位置相对应并构成所述多个网点；
    所述第二导光层在朝向所述第三导光层的第二内表面上具有多个第三凹点，所述第三导光层在朝向所述第二导光层的第一内表面上具有多个第四凹点，所述多个第三凹点和所述多个第四凹点的位置相对应并构成所述多个网点。
  5. 根据权利要求1-4任一项所述的导光结构，其中，所述多个网点的大小相等，疏密程度不等，随着到光源的距离变大所述多个网点变密，并且所述导光结构构造为接收并传输来自所述光源的光。
  6. 根据权利要求1-4任一项所述的导光结构，其中，所述多个网点的疏密程度相同，大小不等，随着到所述光源的距离变大所述多个网点变大，并且所述导光结构构造为接收并传输来自所述光源的光。
  7. 根据权利要求1-6任一项所述的导光结构，其中，在所述相邻的导光 层之间的除所述多个网点之外的位置处设置有软化层。
  8. 根据权利要求7所述的导光结构，其中，所述至少两层导光层的材料为透明树脂，所述软化层的材料为透明陶瓷类材料或透明高分子复合材料。
  9. 根据权利要求1-8中任一项所述的导光结构，其中，所述导光结构的厚度为0.2mm～6mm。
  10. 根据权利要求1-9任一项所述的导光结构，其中，相对于所述相邻的导光层之间的接触面，所述多个网点的每个为对称结构。
  11. 根据权利要求10所述的导光结构，其中，在垂直于所述导光结构的方向上，所述多个网点的每个的截面形状为圆形，且所述圆形的直径为10μm～200μm。
  12. 根据权利要求1-11任一项所述的导光结构，其中，所述多个网点的每个为空腔。
  13. 一种背光模组，包括如权利要求1-12任一项所述的导光结构。
  14. 根据权利要求13所述的背光模组，还包括：
    反射涂层，设置在所述导光结构的表面。
  15. 根据权利要求14所述的背光模组，其中，所述反射涂层为白色油墨或白漆，且厚度为0.02～0.07mm。
  16. 一种显示装置，包括：
    如权利要求13-15任一项所述的背光模组；以及
    显示面板，位于所述背光模组的出光侧。
  17. 一种导光结构的制造方法，包括：
    形成至少两层导光层；以及
    在相邻的导光层之间形成多个网点。
  18. 根据权利要求17所述的制造方法，包括：
    制作第一导光层和第二导光层；
    在第一导光层上形成多个第一凹点，在第二导光层上形成多个第二凹点，在所述第一导光层的除所述多个第一凹点之外的位置处形成第一软化层，在所述第二导光层的除所述多个第二凹点之外的位置处形成第二软化层；
    对所述第一导光层和所述第二导光层进行压合；
    进行加热处理，使得第一软化层和第二软化层软化以将第一导光层和第 二导光层连接在一起。
  19. 根据权利要求17所述的制造方法，其中，
    通过激光烧蚀在相邻的导光层之间形成所述多个网点。
  20. 根据权利要求19所述的制造方法，其中，
    在所述激光烧蚀之前，所述方法还包括采用凸透镜对激光进行汇聚。
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