CN108873152B - Manufacturing method of light guide plate and manufacturing method of display device - Google Patents
Manufacturing method of light guide plate and manufacturing method of display device Download PDFInfo
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- CN108873152B CN108873152B CN201810786444.0A CN201810786444A CN108873152B CN 108873152 B CN108873152 B CN 108873152B CN 201810786444 A CN201810786444 A CN 201810786444A CN 108873152 B CN108873152 B CN 108873152B
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- guide plate
- light guide
- foaming agent
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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
- G02B6/0065—Manufacturing aspects; Material aspects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
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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
- G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The embodiment of the invention discloses a method for manufacturing a light guide plate, which comprises the following steps: providing a polymeric material; providing a blowing agent; and mixing the polymer material and the foaming agent in a preset manner and injecting the mixture into a molding die to manufacture the light guide plate containing bubbles generated by the foaming agent. The embodiment of the invention also discloses a manufacturing method of the display device. According to the embodiment of the invention, the bubbles are formed in the light guide plate, so that the weight of the light guide plate can be reduced under the condition of not reducing the thickness of the light guide plate; in addition, the bubbles in the light guide plate can destroy the total reflection of the light in the light guide plate, and an atomized light emitting effect is generated, so that more light can be emitted from the light emitting surface of the light guide plate, and the technical effects of reducing the weight of the light guide plate and improving the display uniformity while ensuring the thickness of the light guide plate are finally realized.
Description
Technical Field
The invention relates to the technical field of display, in particular to a manufacturing method of a light guide plate and a manufacturing method of a display device.
Background
At present, in the display technology field, a surface light source is usually formed by combining a light guide plate with a lateral light source, light emitted from the lateral light source enters the light guide plate from a light incident surface on one side of the light guide plate, and is emitted from a light emitting surface of the light guide plate after being emitted and diffused by light guide points on the light guide plate, so as to provide light required for work for a display panel.
However, in order to fully utilize the light source emitted by the LED, most of the light rays need to be emitted into the light guide plate, and the light guide plate manufactured by the method often has a certain thickness to solve the above problems.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a method for manufacturing a light guide plate and a method for manufacturing a display device, by which the weight of the light guide plate and the display device can be reduced and the display uniformity can be improved.
In order to achieve the above object, a method for manufacturing a light guide plate according to an embodiment of the present invention includes: providing a polymeric material; providing a blowing agent; and mixing the polymer material and the foaming agent in a preset manner and injecting the mixture into a molding die to manufacture the light guide plate containing bubbles generated by the foaming agent.
In one embodiment, the polymer material is polymethyl methacrylate or polycarbonate.
In one embodiment, the mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes: and uniformly mixing the polymer material and the foaming agent and injecting the mixture into the forming mold to prepare the light guide plate containing uniformly distributed bubbles generated by the foaming agent.
In one embodiment, the mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes: injecting the polymeric material into the molding die for a first period of time; continuously injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into the forming die in a second time period; and continuing to inject the polymeric material into the molding die for a third period of time.
In one embodiment, the first time and the third time are equal in time length.
In one embodiment, the mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes: injecting the polymer material into a first sub-mold to make a first sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a second sub-mold to obtain a second sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a third sub-mold to make a third sub-sheet; aligning the first sub-board, the second sub-board and the third sub-board and superposing the first sub-board, the second sub-board and the third sub-board in the thickness direction to obtain the light guide plate; the first sub-board, the second sub-board and the third sub-board are the same in length and width, and the second sub-board is located between the first sub-board and the third sub-board.
In one embodiment, the first sub-board and the second sub-board have different thicknesses.
In one embodiment, the mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes: injecting the polymer material into a first sub-mold to make a first sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a second sub-mold to obtain a second sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a third sub-mold to make a third sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a fourth sub-mold to obtain a fourth sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a fifth sub-mold to make a fifth sub-sheet; aligning the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board, and superposing the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board in the thickness direction to obtain the light guide plate; the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board are the same in length and width, and the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board are connected in sequence.
In one embodiment, the mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes: injecting the mixture obtained by uniformly mixing the polymer material and the foaming agent in a first proportion into the forming die in a first time period; continuously injecting the mixture obtained by uniformly mixing the polymer material and the foaming agent in a second proportion into the forming die in a second time period; and continuing to inject the mixture of the polymer material and the foaming agent uniformly mixed in a third proportion into the forming die for a third period of time; wherein the second ratio is less than the first ratio and the third ratio.
The embodiment of the invention also provides a manufacturing method of the display device, which comprises the following steps: providing a light guide plate, wherein the light guide plate is manufactured by the manufacturing method of the light guide plate according to any one of the previous embodiments and comprises: a body having bubbles formed therein; the light incident surface is positioned on the side part of the body; the light emitting surface is positioned at the top of the body; providing a back plate, and installing the back plate on the side of the bottom of the body far away from the top, wherein the surface of the back plate facing the body is a mirror-finished smooth surface; providing a light emitting unit, and arranging the light emitting unit adjacent to the light incident surface; providing an optical film group, and arranging the optical film group on the side of the top part far away from the bottom part.
According to the embodiment of the invention, the bubbles are formed in the light guide plate, so that the weight of the light guide plate can be reduced under the condition of not reducing the thickness of the light guide plate; in addition, the bubbles in the light guide plate can destroy the total reflection of the light in the light guide plate, and an atomized light emitting effect is generated, so that more light can be emitted from the light emitting surface of the light guide plate, and the technical effects of reducing the weight of the light guide plate and improving the display uniformity while ensuring the thickness of the light guide plate are finally realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart illustrating a method for manufacturing a light guide plate according to an embodiment of the present invention;
fig. 2 is a flow chart illustrating a manufacturing method of a display device according to an embodiment of the invention;
FIG. 3 is a schematic view of a light guide plate and a display device including the light guide plate manufactured by the method according to an embodiment of the present invention;
FIG. 4 is a schematic view of a light guide plate and a display device including the light guide plate manufactured by the method according to an embodiment of the present invention;
FIG. 5 is a schematic view of a light guide plate and a display device including the light guide plate manufactured by the method according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a light guide plate and a display device including the light guide plate manufactured by the method according to an embodiment of the present invention;
fig. 7 is a schematic view of a light guide plate manufactured by the method according to an embodiment of the present invention and a display device including the light guide plate.
Reference numerals:
100 a-a display device;
10 a-a light source module; 11 a-a light emitting unit; 12 a-a circuit board; 20 a-a back plate;
30 a-a light guide plate; 31 a-a body; 311 a-bubbles;
32 a-the light incident surface; 33 a-a light-emitting surface; 34 a-a reflective surface.
100 b-a display device;
10 b-a light source module; 11 b-a light-emitting unit; 12 b-a circuit board; 20 b-a back plate;
30 b-a light guide plate; 31 b-a body; 311 b-bubbles;
32 b-the light incident surface; 33 b-a light-emitting surface; 34 b-reflective surface.
100 c-a display device;
10 c-a light source module; 11 c-a light emitting unit; 12 c-a circuit board; 20 c-a back plate;
30 c-a light guide plate; 31 c-a body; 311 c-bubble;
32 c-the light incident surface; 33 c-a light-emitting surface; 34 c-reflective surface.
100 d-display device;
10 d-a light source module; 11 d-a light-emitting unit; 12 d-a circuit board; 20 d-a back plate;
30 d-a light guide plate; 31 d-body; 311 d-bubble;
32 d-the light incident surface; 33 d-a light-emitting surface; 34 d-reflective surface.
100 e-a display device;
10 e-a light source module; 11 e-a light emitting unit; 12 e-a circuit board; 20 e-a back plate;
30 e-a light guide plate; 31 e-a body; 311 e-bubbles;
32 e-the light incident surface; 33 e-a light-emitting surface; 34 e-reflective surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The display device of the embodiment of the invention can be a liquid crystal display panel, an OLED (Organic Light Emitting Diode) display device, a QLED (Quantum Dot Light Emitting Diode) display device, a curved surface display device or other display devices.
As shown in fig. 1, an embodiment of the present invention provides a method for manufacturing a light guide plate, which mainly includes:
step S11, providing a polymer material;
step S13, providing a foaming agent; and
and a step S15 of mixing the polymer material with the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture a light guide plate including bubbles generated by the foaming agent.
The polymer material is, for example, PMMA (polymethyl methacrylate) or transparent PC (Polycarbonate). The blowing agent is, for example, a blowing agent such as nitrogen or carbon dioxide.
In some embodiments, step S15 includes, for example: and uniformly mixing the polymer material and the foaming agent and injecting the mixture into the forming mold to prepare the light guide plate containing uniformly distributed bubbles generated by the foaming agent.
In other embodiments, step S15 includes, for example: injecting the polymeric material into the molding die for a first period of time; continuously injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into the forming die in a second time period; and continuing to inject the polymeric material into the molding die for a third period of time. Specifically, the time length of the first time is, for example, equal to the time length of the third time.
In other embodiments, step S15 includes, for example: injecting the polymer material into a first sub-mold to make a first sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a second sub-mold to obtain a second sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a third sub-mold to make a third sub-sheet; aligning the first sub-board, the second sub-board and the third sub-board and superposing the first sub-board, the second sub-board and the third sub-board in the thickness direction to obtain the light guide plate; the first sub-board, the second sub-board and the third sub-board are the same in length and width, and the second sub-board is located between the first sub-board and the third sub-board. In particular, the thickness of the first sub-plate and the thickness of the second sub-plate are for example different.
In still other embodiments, step S15 includes, for example: injecting the polymer material into a first sub-mold to make a first sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a second sub-mold to obtain a second sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a third sub-mold to make a third sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a fourth sub-mold to obtain a fourth sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a fifth sub-mold to make a fifth sub-sheet; aligning the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board, and superposing the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board in the thickness direction to obtain the light guide plate; the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board are the same in length and width, and the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board are connected in sequence.
The superposition combining is, for example, sequentially connecting the contact surfaces between every two adjacent sub-boards superposed and aligned in the thickness direction by using optical Clear adhesive (oca), thermal welding, or the like to obtain the light guide plate. It should be noted that the embodiments of the present invention are not limited thereto, and the superposition combining method capable of ensuring good light transmittance and connection strength is within the protection scope of the present invention.
In some other embodiments, step S15 includes, for example: injecting the mixture obtained by uniformly mixing the polymer material and the foaming agent in a first proportion into the forming die in a first time period; continuously injecting the mixture obtained by uniformly mixing the polymer material and the foaming agent in a second proportion into the forming die in a second time period; and continuing to inject the mixture of the polymer material and the foaming agent uniformly mixed in a third proportion into the forming die for a third period of time; wherein the second ratio is less than the first ratio and the third ratio.
As shown in fig. 2, a method for manufacturing a display device according to an embodiment of the present invention mainly includes:
step S21, providing a light guide plate, wherein the light guide plate is manufactured by the manufacturing method of the light guide plate according to any one of the embodiments and comprises the following steps: a body having bubbles formed therein; the light incident surface is positioned on the side part of the body; the light emitting surface is positioned at the top of the body;
step S23, providing a back plate, and installing the back plate on the bottom of the body far from the top, wherein the surface of the back plate facing the body is a smooth surface subjected to mirror surface treatment;
step S25, providing a light emitting unit and arranging the light emitting unit adjacent to the light incident surface;
and step S27, providing an optical film group, and arranging the optical film group on the side of the top part far away from the bottom part.
The following will describe in detail the light guide plate and the display device manufactured by the method for manufacturing the light guide plate and the method for manufacturing the display device according to the foregoing embodiments of the present invention, by taking fig. 2 to 7 as examples.
As shown in fig. 3, when step S15 includes: "the polymer material is uniformly mixed with the foaming agent and injected into the molding die to manufacture a light guide plate containing bubbles uniformly distributed and generated by the foaming agent", an example of one embodiment of a light guide plate 30a and a display device 100a including the light guide plate 30a is manufactured. The display device 100a further includes a light source module 10a and a back plate 20 a.
The light guide plate 30a includes a body 31a, a light incident surface 32a located at a side of the body 31a, a light emitting surface 33a located at a top of the body 32a, and a reflective surface 34a located at a bottom of the body 31a and opposite to the light emitting surface 33a, and in one embodiment, the reflective surface 34a is provided with a plurality of dots or is attached with a reflective sheet. The light incident surface 32a may be only located on one side of the body 31a, or may be symmetrically distributed on two opposite sides of the body 31a, or even on the peripheral side of the body 31 a. The light source module 10a includes a light emitting unit 11a disposed adjacent to the light incident surface 32a of the light guide plate and a circuit board 12a supporting the light emitting unit 11 a. The back plate 20a is disposed at the bottom of the light guide plate 30a, and the surface of the back plate 20a facing the light guide plate 30a is mirror-processed to reflect the light emitted from the reflective surface 34a to the back plate 20a to the light emitting surface 33a of the light guide plate 30 a. Specular treatment refers to a smooth surface upon which light is mostly specularly reflected.
The bubbles 311a are formed in the body 31a of the light guide plate 30a, and the arrangement of the bubbles 311a can reduce the weight of the light guide plate 30a without reducing the thickness of the light guide plate 30 a. The thickness of the light guide plate 30a is not changed, most of the light emitted by the light emitting unit 11a can still enter the light guide plate 30a, and the air bubbles 311a are disposed in the body 31a, so that the structural strength of the light guide plate 30a is not greatly reduced. In addition, the bubbles 311a may destroy the total reflection of the light in the body 31a, so as to generate an atomized light emitting effect, and more light is emitted from the light emitting surface 33a at the top of the light guide plate 30a uniformly. The weight of the display device 100a using the light guide plate 30a is also effectively reduced.
The body 31a may have a plurality of uniformly distributed bubbles 311a therein. The diameter of the air bubbles 311a in the body 31a ranges from 0.1mm to 2mm, and may be specifically set according to the thickness of the light guide plate 30a and the weight to be reduced. For example, when the thickness of the light guide plate 30a is 4mm, the diameter of the bubbles 311a may be 0.5 mm; when the thickness of the light guide plate 30a is 6mm, the diameter of the bubbles 311a may be 0.8 mm; when the light guide plate 30a has a thickness of 9mm, the diameter of the air bubbles 311a may be 1.5 mm.
The space occupied by the bubbles 311a in the body 31a greatly affects the self-weight of the light guide plate 30a, and when the weight to be reduced is small, the total volume of the bubbles 311a can be small; when the weight to be reduced is large, the total volume of the bubbles 311a may be large, but the total volume of the bubbles 311a is not excessively large in order to ensure a certain strength of the light guide plate 30 a. In this embodiment, the ratio of the volume of the bubble 311a to the volume of the body 31a ranges from 1:9 to 4: 6. For example, when a small weight reduction is required, the ratio of the volume of the bubble 311a to the body 31a may be 2: 8; when a large reduction in weight is required, the ratio of the volume of the bubbles 311a to the body 31a may be 3: 7.
As shown in fig. 4, when step S15 includes: "injecting the polymeric material into the forming mold for a first period of time; continuously injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into the forming die in a second time period; and continuing to inject the polymer material into the molding die for a third period of time, the length of time of the first time being equal to, for example, the length of time of the third time ″, an example of an embodiment of a light guide plate 30b and a display device 100b including the light guide plate 30b is manufactured. The display device 100b further includes a light source module 10b and a back plate 20 b.
The light guide plate 30b includes a body 31b, a light incident surface 32b located at a side of the body 31b, a light emitting surface 33b located at a top of the body 32b, and a reflecting surface 34b located at a bottom of the body 31b and opposite to the light emitting surface 33 b. The light incident surface 32b may be only located on one side of the body 31b, or may be symmetrically distributed on two opposite sides of the body 31b, or even on the peripheral side of the body 31 b. The light source module 10b includes a light emitting unit 11b disposed adjacent to the light incident surface 32b of the light guide plate 30b and a circuit board 12b supporting the light emitting unit 11 b. The back plate 20b is disposed at the bottom of the light guide plate 30b, and the surface of the back plate 20b facing the light guide plate 30b is mirror-processed to reflect the light emitted from the reflective surface 34b onto the back plate 20b to the light emitting surface 33b of the light guide plate 30 b. Specular treatment refers to a smooth surface upon which light is mostly specularly reflected.
The bubbles 311b are formed in the main body 31b of the light guide plate 30b, and the arrangement of the bubbles 311b can reduce the weight of the light guide plate 30b without reducing the thickness of the light guide plate 30 b. The thickness of the light guide plate 30b is not changed, most of the light emitted by the light emitting unit 11b can still enter the light guide plate 30b, and the air bubbles 311b are arranged in the body, so that the structural strength of the light guide plate 30b is not greatly reduced. In addition, the bubbles 311b may destroy the total reflection of the light in the body 31b, so as to generate an atomized light emitting effect, and more light is emitted from the light emitting surface 33b at the top of the light guide plate 30b uniformly. The weight of the display device 100b using the light guide plate 30b is also effectively reduced.
The body 31b may have a bubble 311b therein, i.e., the light guide plate 30b forms a hollow structure. The air bubble 311b may be approximately circular or rectangular in a direction perpendicular to the reflection surface 34b or the light emitting surface 33b, and is disposed at the center inside the body 31 b. For example, the length of the light guide plate 30b is 400mm, the width is 300mm, and if the air bubbles 311b are circular, the diameter of the circle may be 50mm to 100mm, for example, 80 mm; if the bubble 311b is rectangular, the rectangular bubble 311b may have a length of 80mm and a width of 60 mm.
The center line of the bubble 311b may be disposed between the reflection surface 34b and the light exit surface 33b, or may be offset toward the reflection surface 34 b.
The thickness of the bubble is 0.1mm to 3mm, which is determined by the thickness of the light guide plate 30b, and the bubble 311b disposed between the reflective surface 34b and the light exit surface 33b should keep a distance from the reflective surface 34b and the light exit surface 33b, so that the light guide plate 30b still has sufficient strength. When the thickness of the light guide plate 30b is 4mm, the thickness of the bubbles 311b is 0.5mm to 2mm, for example, 1 mm.
As shown in fig. 5, when step S15 includes: "injecting the polymeric material into a first sub-mold to form a first sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a second sub-mold to obtain a second sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a third sub-mold to make a third sub-sheet; aligning the first sub-board, the second sub-board and the third sub-board and superposing the first sub-board, the second sub-board and the third sub-board in the thickness direction to obtain the light guide plate; the first sub-board, the second sub-board and the third sub-board are the same in length and width, and the second sub-board is located between the first sub-board and the third sub-board. The thickness of the first sub-plate, for example, is different from the thickness of the second sub-plate ", an example of an embodiment of a light guide plate 30c and a display device 100c including the light guide plate 30c is manufactured. The display device 100c further includes a light source module 10c, a back plate 20c, and an optical film set.
The light guide plate 30c includes a body 31c, a light incident surface 32c located at a side of the body 31c, a light emitting surface 33c located at a top of the body 32c, and a reflecting surface 34c located at a bottom of the body 31c and opposite to the light emitting surface 33 c. The light incident surface 32c may be only located on one side of the body 31c, or may be symmetrically distributed on two sides of the body 31c, or even on the peripheral side of the body 31 c. The light source module 10c includes a light emitting unit 11c disposed adjacent to the light incident surface 32c of the light guide plate 30c and a circuit board 12c supporting the light emitting unit 11c, in one embodiment, the light emitting unit 11c is an LED, and the corresponding light source module 10c is an LED light bar. The back plate 20c is disposed at the bottom of the light guide plate 30c, and the surface of the back plate 20c facing the light guide plate 30c is mirror-processed to reflect the light emitted from the reflective surface 34c onto the back plate 20c to the light emitting surface 33c of the light guide plate 30 c. Specular treatment refers to a smooth surface upon which light is mostly specularly reflected. In addition, an optical film set (not labeled in fig. 5) is located above the light exit surface 33c of the light guide plate 30c, and includes, for example, an optical film such as a diffusion sheet.
The bubbles 311c are formed in the main body 31c of the light guide plate 30c, and the arrangement of the bubbles 311c can reduce the weight of the light guide plate 30c without reducing the thickness of the light guide plate 30 c. The thickness of the light guide plate 30c is not changed, most of the light emitted by the light emitting unit 11c can still enter the light guide plate 30c, and the air bubbles 311c are arranged in the body, so that the structural strength of the light guide plate 30c is not greatly reduced. In addition, the bubbles 311c may destroy the total reflection of the light in the body 31c, so as to generate an atomized light emitting effect, and more light is emitted from the light emitting surface 33c at the top of the light guide plate 30 c. The weight of the display device 100c using the light guide plate 30c is also effectively reduced.
The air bubbles 311c are located on a layer between the light emitting surface 33c and the reflecting surface 34c, and the air bubbles 311c are located on a same plane, which is parallel to the reflecting surface 34c and the light emitting surface 33c and is close to the reflecting surface 34c and far from the light emitting surface 33 c. The air bubbles 311c are disposed near the reflection surface 34c, so that the light totally reflected in the main body 31c is scattered by the air bubbles 311c and emitted from the light-emitting surface 33c when approaching the reflection surface 34c, thereby increasing the light flux on the light-emitting surface 33 c.
The diameter of the air bubbles 311c in the body 31c ranges from 0.3mm to 1.5mm, and can be specifically set according to the thickness of the light guide plate 30c and the weight to be reduced. For example, when the thickness of the light guide plate 30c is 5mm, the diameter of the bubbles 311c may be 0.4 mm; when the thickness of the light guide plate 30c is 6mm, the diameter of the bubbles 311c may be 1.0 mm; when the light guide plate 30c has a thickness of 10mm, the diameter of the air bubbles 311c may be 1.3 mm.
The space occupied by the bubbles 311c in the body 31c greatly affects the self weight of the light guide plate 30c, and when the weight to be reduced is small, the total volume of the bubbles 311c can be small; when the weight to be reduced is large, the total volume of the bubbles 311c may be large, but the total volume of the bubbles 311c is not excessively large in order to ensure a certain strength of the light guide plate 30 c. In this embodiment, the ratio of the volume of the bubble 311c to the volume of the body 31c ranges from 1:9 to 3: 7. For example, when a small weight reduction is required, the ratio of the volume of the bubble 311c to the body 31c may be 1: 9; when a large reduction in weight is required, the ratio of the volume of the bubble 311c to the body 31c may be 2: 8.
As shown in fig. 6, when step S15 includes: "injecting the polymeric material into a first sub-mold to form a first sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a second sub-mold to obtain a second sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a third sub-mold to make a third sub-sheet; injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a fourth sub-mold to obtain a fourth sub-sheet containing uniformly distributed bubbles generated by the foaming agent; injecting the polymer material into a fifth sub-mold to make a fifth sub-sheet; aligning the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board, and superposing the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board in the thickness direction to obtain the light guide plate; wherein, the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board have the same length and the same width, and when the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board are connected in sequence ", the light guide plate 30d and the display device 100d including the light guide plate 30d are manufactured in an example of one embodiment. The display device 100d further includes a light source module 10d, a back plate 20d, and an optical film set.
The light guide plate 30d includes a body 31d, a light incident surface 32d located at a side of the body 31d, a light emitting surface 33d located at a top of the body 32d, and a reflecting surface 34d located at a bottom of the body 31d and opposite to the light emitting surface 33 d. The light incident surface 32d may be only located on one side of the body 31d, may be symmetrically distributed on two sides of the body 31d, and may even be on the peripheral side of the body 31 d. The light source module 10d includes a light emitting unit 11d disposed adjacent to the light incident surface 32d of the light guide plate 30d and a circuit board 12d supporting the light emitting unit 11 d. The back plate 20d is disposed at the bottom of the light guide plate 30d, and the surface of the back plate 20d facing the light guide plate 30d is mirror-processed to reflect the light emitted from the reflective surface 34d onto the back plate 20d onto the light emitting surface 33d of the light guide plate 30 d. Specular treatment refers to a smooth surface upon which light is mostly specularly reflected. In addition, an optical film set (not labeled in fig. 6) is located above the light exit surface 33d of the light guide plate 30d, and includes, for example, an optical film such as a diffusion sheet.
The bubbles 311d are formed in the main body 31d of the light guide plate 30d, and the arrangement of the bubbles 311d can reduce the weight of the light guide plate 30d without reducing the thickness of the light guide plate 30 d. The thickness of the light guide plate 30d is not changed, most of the light emitted by the light emitting unit 11d can still enter the light guide plate 30d, and the air bubbles 311d are disposed in the body, so that the structural strength of the light guide plate 30d is not greatly reduced. In addition, the bubbles 311d may destroy the total reflection of the light in the body 31d, so as to generate an atomized light emitting effect, and more light is emitted from the light emitting surface 33d at the top of the light guide plate 30 d. The weight of the display device 100d using the light guide plate 30d is also effectively reduced.
The air bubbles 311d are located on two layers between the light emitting surface 33d and the reflecting surface 34d, the air bubbles 311d are respectively located on two parallel planes, the two parallel planes are parallel to the reflecting surface 34d and the light emitting surface 33d, and the two parallel planes are entirely close to the reflecting surface 34d and far away from the light emitting surface 33 d. The air bubbles 311d are disposed near the reflection surface 34d, so that the light totally reflected in the main body 31d is scattered by the air bubbles 311d and emitted from the light-emitting surface 33d when approaching the reflection surface 34d, thereby increasing the light flux on the light-emitting surface 33 d.
The diameter of the air bubbles 311d in the body 31d ranges from 0.1mm to 1.5mm, and can be specifically set according to the thickness of the light guide plate 30d and the weight to be reduced. For example, when the thickness of the light guide plate 30d is 5mm, the diameter of the bubbles 311d may be 0.5 mm; when the thickness of the light guide plate 30d is 6mm, the diameter of the bubbles 311d may be 1.0 mm; when the light guide plate 30d has a thickness of 10mm, the diameter of the air bubbles 311d may be 1.2 mm.
The space occupied by the bubbles 311d in the body 31d greatly affects the self-weight of the light guide plate 30d, and when the weight to be reduced is small, the total volume of the bubbles 311d can be small; when the weight to be reduced is large, the total volume of the bubbles 311d may be large, but the total volume of the bubbles 311d is not excessively large in order to ensure a certain strength of the light guide plate 30 d. In this embodiment, the ratio of the volume of the bubble 311d to the volume of the body 31d ranges from 1:9 to 4: 6. For example, when a small weight reduction is required, the ratio of the volume of the bubble 311d to the body 31d may be 1: 9; when a large reduction in weight is required, the ratio of the volume of the bubble 311d to the body 31d may be 2: 8.
As shown in fig. 7, when step S15 includes: "injecting a mixture of the polymeric material and the blowing agent uniformly mixed at a first ratio into the forming die for a first period of time; continuously injecting the mixture obtained by uniformly mixing the polymer material and the foaming agent in a second proportion into the forming die in a second time period; and continuing to inject the mixture of the polymer material and the foaming agent uniformly mixed in a third proportion into the forming die for a third period of time; wherein the second ratio is smaller than the first ratio and the third ratio ″, an example of an embodiment of a light guide plate 30e and a display device 100e including the light guide plate 30e is manufactured. The display device 100e further includes a light source module 10e, a back plate 20e, and an optical film set.
The light guide plate 30e includes a body 31e, a light incident surface 32e located at a side of the body 31e, a light emitting surface 33e located at a top of the body 32e, and a reflecting surface 34e located at a bottom of the body 31e and opposite to the light emitting surface 33 e. The light incident surface 32e may be only located on one side of the body 31e, may be symmetrically distributed on two sides of the body 31e, and may even be on the peripheral side of the body 31 e. The light source module 10e includes a light emitting unit 11e disposed adjacent to the light incident surface 32e of the light guide plate 30e and a circuit board 12e supporting the light emitting unit 11 e. The back plate 20e is disposed at the bottom of the light guide plate 30e, and the surface of the back plate 20e facing the light guide plate 30e is mirror-processed to reflect the light emitted from the reflective surface 34e to the back plate 20e to the light emitting surface 33e of the light guide plate 30 e. Specular treatment refers to a smooth surface upon which light is mostly specularly reflected. In addition, an optical film set (not labeled in fig. 7) is located above the light exit surface 33e of the light guide plate 30e, and includes, for example, an optical film such as a diffusion sheet.
The bubbles 311e are formed in the main body 31e of the light guide plate 30e, and the arrangement of the bubbles 311e can reduce the weight of the light guide plate 30e without reducing the thickness of the light guide plate 30 e. The thickness of the light guide plate 30e is not changed, most of the light emitted by the light emitting unit 11e can still enter the light guide plate 30e, and the air bubbles 311e are arranged in the body, so that the structural strength of the light guide plate 30e is not greatly reduced. In addition, the bubbles 311e may destroy the total reflection of the light in the body 31e, so as to generate an atomized light emitting effect, and more light is emitted from the light emitting surface 33e at the top of the light guide plate 30 e. The weight of the display device 100e using the light guide plate 30e is also effectively reduced.
The body 31e includes a central region and a peripheral region surrounding the central region, and particularly when the thickness dimension of the light guide plate 30e is small and the number of the bubbles 311e on the body 31e greatly reduces the strength of the light guide plate 30e, the bubbles 311e in the peripheral region may be denser than the bubbles 311e in the central region, so that the central region has higher strength than the peripheral region.
The diameter of the air bubbles 311e in the body 31e ranges from 0.1mm to 1.5mm, and can be specifically set according to the thickness of the light guide plate 30e and the weight to be reduced. For example, when the thickness of the light guide plate 30e is 5mm, the diameter of the bubbles 311e may be 0.5 mm; when the thickness of the light guide plate 30e is 6mm, the diameter of the bubbles 311e may be 1.0 mm; when the light guide plate 30e has a thickness of 10mm, the diameter of the air bubbles 311e may be 1.2 mm.
The space occupied by the air bubbles 311e in the body 31e greatly affects the self weight of the light guide plate 30e, and when the weight to be reduced is small, the total volume of the air bubbles 311e can be small; when the weight to be reduced is large, the total volume of the air bubbles 311e may be large, but the total volume of the air bubbles 311e is not excessively large in order to ensure a certain strength of the light guide plate 30 e. In this embodiment, the ratio of the volume of the bubble 311e to the volume of the body 31e ranges from 1:9 to 4: 6. Specifically, the bubble volume ratio in the central region may be 1:9, and the bubble volume ratio in the peripheral region may be 3: 7. For example, when a small weight reduction is required, the bubble volume ratio in the central region may be 1:9, and the bubble volume ratio in the peripheral region may be 2: 8; when a large reduction in weight is required, the bubble volume ratio in the central region may be 2:8, and the bubble volume ratio in the peripheral region may be 3: 7.
The air bubble 311e is located in the main body 31e, and the air bubble 311e keeps a distance from the light incident surface 32e, where the distance is 2 to 10mm, for example, 5 mm.
In the embodiment of the present invention, since the air bubbles 311e are formed in the body 31e of the manufactured light guide plate 30e, the weight of the light guide plate 30e is reduced without reducing the thickness of the light guide plate 30e and without greatly reducing the strength of the light guide plate 30 e. The display device 100e having the light guide plate 30e can be made more lightweight. And the bubble 311e may act as a scattering structure to scatter light.
Finally, it should be noted that the display devices 100a to 100e in the foregoing embodiments may include structures such as a plastic frame, a front frame, a panel, etc. well known to those skilled in the art, in addition to the light source modules 10a to 10e, the back plates 20a to 20e, the side-in light guide plates 30a to 30e, and even the optical film set.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and/or method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units/modules is only one logical division, and there may be other divisions in actual implementation, for example, multiple units or modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units/modules described as separate parts may or may not be physically separate, and parts displayed as units/modules may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units/modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, each functional unit/module in the embodiments of the present invention may be integrated into one processing unit/module, or each unit/module may exist alone physically, or two or more units/modules may be integrated into one unit/module. The integrated units/modules may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units/modules.
The integrated units/modules, which are implemented in the form of software functional units/modules, may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing one or more processors of a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A method for manufacturing a light guide plate is characterized by comprising the following steps:
providing a polymeric material;
providing a blowing agent; and
mixing the polymer material and the foaming agent in a preset manner and injecting the mixture into a molding die to manufacture a light guide plate containing bubbles generated by the foaming agent;
wherein the content of the first and second substances,
the mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes:
injecting the polymeric material into the molding die for a first period of time;
continuously injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into the forming die in a second time period; and
continuing to inject the polymeric material into the molding die for a third period of time;
the time lengths of the first time and the third time are equal; or
The mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes:
injecting the polymer material into a first sub-mold to make a first sub-sheet;
injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a second sub-mold to obtain a second sub-sheet containing uniformly distributed bubbles generated by the foaming agent;
injecting the polymer material into a third sub-mold to make a third sub-sheet; and
aligning the first sub-board, the second sub-board and the third sub-board and superposing and combining the first sub-board, the second sub-board and the third sub-board in the thickness direction to obtain the light guide plate;
the first sub-board, the second sub-board and the third sub-board are the same in length and width, the second sub-board is located between the first sub-board and the third sub-board, and the first sub-board and the second sub-board are different in thickness;
or
The mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes:
injecting the polymer material into a first sub-mold to make a first sub-sheet;
injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a second sub-mold to obtain a second sub-sheet containing uniformly distributed bubbles generated by the foaming agent;
injecting the polymer material into a third sub-mold to make a third sub-sheet;
injecting a mixture obtained by uniformly mixing the polymer material and the foaming agent into a fourth sub-mold to obtain a fourth sub-sheet containing uniformly distributed bubbles generated by the foaming agent;
injecting the polymer material into a fifth sub-mold to make a fifth sub-sheet; and
aligning the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board, and superposing the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board in the thickness direction to obtain the light guide plate;
the first sub-board, the second sub-board, the third sub-board, the fourth sub-board and the fifth sub-board are the same in length and width, and are sequentially connected with one another;
or
The mixing the polymer material and the foaming agent in a predetermined manner and injecting the mixture into a molding die to manufacture the light guide plate including bubbles generated by the foaming agent includes:
injecting the mixture obtained by uniformly mixing the polymer material and the foaming agent in a first proportion into the forming die in a first time period;
continuously injecting the mixture obtained by uniformly mixing the polymer material and the foaming agent in a second proportion into the forming die in a second time period; and
continuously injecting the mixture obtained by uniformly mixing the polymer material and the foaming agent in a third proportion into the forming die in a third time period;
wherein the second ratio is less than the first ratio and the third ratio.
2. The method for manufacturing a light guide plate according to claim 1, wherein the polymer material is polymethyl methacrylate or polycarbonate.
3. A method for manufacturing a display device, comprising:
providing a light guide plate made by the method of manufacturing a light guide plate according to any one of claims 1 to 2 and comprising: a body having bubbles formed therein; the light incident surface is positioned on the side part of the body; the light emitting surface is positioned at the top of the body;
providing a back plate, and installing the back plate on the side of the bottom of the body far away from the top, wherein the surface of the back plate facing the body is a mirror-finished smooth surface;
providing a light emitting unit, and arranging the light emitting unit adjacent to the light incident surface;
providing an optical film group, and arranging the optical film group on the side of the top part far away from the bottom part.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810786444.0A CN108873152B (en) | 2018-07-17 | 2018-07-17 | Manufacturing method of light guide plate and manufacturing method of display device |
| PCT/CN2019/082295 WO2020015401A1 (en) | 2018-07-17 | 2019-04-11 | Manufacturing method for light guide plate and manufacturing method for display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810786444.0A CN108873152B (en) | 2018-07-17 | 2018-07-17 | Manufacturing method of light guide plate and manufacturing method of display device |
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| CN108873152B true CN108873152B (en) | 2021-04-27 |
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| CN108594358A (en) * | 2018-07-17 | 2018-09-28 | 惠科股份有限公司 | Light guide plate and display device |
| CN108873152B (en) * | 2018-07-17 | 2021-04-27 | 惠科股份有限公司 | Manufacturing method of light guide plate and manufacturing method of display device |
| CN209311728U (en) * | 2018-07-17 | 2019-08-27 | 惠科股份有限公司 | Light guide plate and display device |
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| CN108873152A (en) | 2018-11-23 |
| WO2020015401A1 (en) | 2020-01-23 |
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