CN109605675B - Light guide plate forming device with gradually-changed quantum dot concentration and forming method - Google Patents
Light guide plate forming device with gradually-changed quantum dot concentration and forming method Download PDFInfo
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- CN109605675B CN109605675B CN201811440307.8A CN201811440307A CN109605675B CN 109605675 B CN109605675 B CN 109605675B CN 201811440307 A CN201811440307 A CN 201811440307A CN 109605675 B CN109605675 B CN 109605675B
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- light guide
- guide plate
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- forming device
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- 239000002096 quantum dot Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 51
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 238000001125 extrusion Methods 0.000 claims description 28
- 238000005192 partition Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 15
- 239000004926 polymethyl methacrylate Substances 0.000 description 15
- 238000001816 cooling Methods 0.000 description 9
- 238000000465 moulding Methods 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000000295 emission spectrum Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 1
- AQCDIIAORKRFCD-UHFFFAOYSA-N cadmium selenide Chemical compound [Cd]=[Se] AQCDIIAORKRFCD-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000006862 quantum yield reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
- B29C45/1866—Feeding multiple materials
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
- B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
Abstract
The invention relates to a light guide plate forming device with gradually changed quantum dot concentration, which comprises a plurality of material cavities for placing slurry with different concentrations, wherein each material cavity is provided with a discharge hole, and the material cavities correspond to the same forming cavity; the invention also relates to a forming method of the light guide plate forming device with the gradually-changed quantum dot concentration. The invention has simple and reasonable structural design, can also form the quantum dot light guide plate with gradually changed concentration, is easy to operate, is efficient and convenient, and has wide application prospect.
Description
Technical Field
The invention relates to a light guide plate forming device with gradually changed quantum dot concentration and a forming method.
Background
With the continuous development and progress of display technology, it is very important that the display can bring more real and shocking visual experience to the audience. In the current display field, the liquid crystal backlight technology dominates, and the existing liquid crystal display technology mainly relies on the LED as the backlight source. A conventional LCD having a backlight based on a blue Light Emitting Diode (LED) and a yellow phosphor has a technical limitation of realizing a wide color gamut due to a wide emission spectrum of the yellow phosphor and a wide transmission spectrum of a Color Filter (CF). At present, most LCD color gamut is about 78% NTSC color gamut, and compared with wide color gamut, the display effect is poorer, and especially, a red area is often distorted when displayed. Recently, due to the narrow emission spectrum of quantum dots, the emission spectrum is easy to control, the quantum yield is high, the absorption spectrum is wide and a wide color gamut (up to more than 120% NTSCS color gamut) is provided, so that the quantum dots become mainstream materials of next generation liquid crystal backlights. Currently, the application of quantum dots to liquid crystal backlight mainly has four different LCD backlight source structures: 1) inside the blue LED package 2) between the blue LED package and a Light Guide Plate (LGP), a guide form and 3) forming a thin film 4) on the surface of the light guide plate to mix the quantum dots with the light guide plate constitutes a body light guide plate. The first three quantum dot application forms are based on separating the quantum dots from the light guide plate, and do not directly polymerize the quantum dots and the light guide plate material together, so that the problems of thick backlight module and high cost exist. The fourth quantum dot application form is that the red green quantum dot material and the light guide plate material are directly polymerized together to form the light guide plate, and the quantum dot material and the light guide plate material are directly obtained through the light guide plate polymerization process, so that the concentration of the obtained light guide plate quantum dots is uniform and unchangeable, and the quantum dots cannot be changed according to the change of light intensity. In the quantum dot light guide plate technology, the matching problem of quantum dots and a blue light source exists, namely the lateral light guide plate has the problems of yellow and dark and uneven light emission due to large light energy consumption at a position far away from the light source. Therefore, a quantum dot light guide plate with gradually changed concentration is required to realize uniform light emission, but a forming device capable of realizing quantum dot light guide with gradually changed concentration is not available at present.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide a light guide plate forming device and a forming method with gradually changed quantum dot concentration, which not only have reasonable structural design, but also are efficient and convenient.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a light guide plate forming device of quantum dot concentration gradual change, includes that a plurality of is used for placing the material chamber of different concentration thick liquids, every the material chamber all is provided with discharge gate, a plurality of the material chamber corresponds same one and becomes the die cavity.
Further, a plurality of the material chamber is separated by a plurality of first baffles and is extruded the chamber and form, a plurality of the material chamber sets up side by side and extruding the intracavity, become the upper end that the chamber set up extruding the chamber, become the chamber and extrude and be provided with the second baffle between the chamber, a plurality of the discharge gate sets up side by side on the second baffle, the lower extreme that extrudes the chamber is provided with the stripper plate.
Further, the molding cavity, the second partition plate, the extrusion cavity and the extrusion plate are sequentially arranged in the lower die from top to bottom, and an upper die is arranged at the upper end of the molding cavity.
Furthermore, a plurality of first baffle sets up side by side and is connected with the extrusion plate, set up a plurality of on the second baffle and be used for the guiding hole that first baffle one-to-one passed.
Furthermore, a plurality of springs are arranged between the second partition plate and the extrusion plate, one ends of the springs are connected with the second partition plate, the other ends of the springs are connected with the extrusion plate, and the springs and the first partition plate are arranged in parallel.
Furthermore, heating assemblies are arranged on the side wall of the upper die and the first partition plate.
Further, a plurality of the material chamber sets up respectively on a plurality of feeder hopper, a plurality of the feeder hopper sets up on the carousel, the below of carousel transversely is provided with screw extruder, be provided with on the screw extruder with the corresponding entry in discharge gate in material chamber, screw extruder's exit is provided with mould and lower mould.
Furthermore, a plurality of discharge holes of the material cavity are arranged on the same virtual circle.
Further, be provided with heating element on the screw extruder, be provided with cooling element on the lower mould, the side of going up mould and lower mould is provided with the conveying roller.
A forming method of a light guide plate forming device with gradually changed quantum dot concentration comprises the following steps: the slurry with different concentrations is placed in different material cavities, and the slurry with different concentrations is ejected out of the discharge hole and enters the forming cavity for forming.
Compared with the prior art, the invention has the following beneficial effects: the invention has simple and reasonable structural design, can also form the quantum dot light guide plate with gradually changed concentration, is easy to operate, is efficient and convenient, and has wide application prospect.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a first usage state configuration diagram according to a first embodiment of the present invention.
Fig. 2 is a second usage status configuration diagram according to a first embodiment of the invention.
Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
In the figure: 1-material cavity, 2-discharge hole, 3-forming cavity, 4-first partition plate, 5-extrusion cavity, 6-second partition plate, 7-extrusion plate, 8-lower die, 9-upper die, 10-guide hole, 11-spring, 12-heating component, 13-feed hopper, 14-rotary table, 15-screw extruder, 16-inlet, 17-outlet, 18-cooling component and 19-conveying roller.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in figures 1-3, the light guide plate forming device with the gradually-changed quantum dot concentration comprises a plurality of material cavities 1 for containing slurry with different concentrations, each material cavity 1 is provided with a discharge port 2, and the material cavities 1 correspond to the same forming cavity 3.
In the first embodiment of the invention, the material cavities 1 are formed by dividing the extrusion cavity 5 by the first partition plates 4, the material cavities 1 are arranged in the extrusion cavity 5 side by side, the molding cavity 3 is arranged at the upper end of the extrusion cavity 5, the second partition plate 6 is arranged between the molding cavity 3 and the extrusion cavity 5, the discharge ports 2 are arranged on the second partition plate 6 side by side, and the lower end of the extrusion cavity 5 is provided with the extrusion plate 7.
In the first embodiment of the invention, the forming cavity 3, the second partition plate 6, the extrusion cavity 5 and the extrusion plate 7 are sequentially arranged in the lower die 8 from top to bottom, the upper die 9 is arranged at the upper end of the forming cavity 3, the upper die 9 and the lower die 8 can be horizontally arranged from left to right or vertically arranged from top to bottom, and the time for the extrusion plate 7 to retreat is determined according to the capability of demoulding the formed quantum dot light guide plate sample plate, when the extrusion plate 7 retreats, the slurry in the forming cavity 3 is in a state of about to solidify, after a period of time, the slurry in the forming cavity 3 is solidified due to low temperature cooling, and due to the effect of the heating component 12, the slurry in the extrusion cavity 5 is in a molten state, and the discharge port is in a layered form, thereby being beneficial to demoulding of the quantum dot light guide plate sample plate.
In the first embodiment of the present invention, the first partition plates 4 are arranged side by side and connected to the extrusion plate, and the second partition plate 6 is provided with a plurality of guide holes 10 through which the first partition plates 4 pass one to one.
In the first embodiment of the present invention, a plurality of springs 11 are disposed between the second partition plate 6 and the extrusion plate 7, one end of each spring 11 is connected to the second partition plate 6, the other end of each spring 11 is connected to the extrusion plate 7, and the springs 11 and the first partition plate 4 are disposed in parallel.
In the first embodiment of the present invention, the side wall of the upper mold 9 and the first partition plate 4 are both provided with a heating assembly 12, and the heating assembly 12 may adopt an existing heating device such as an electric heating pipe and an electric heating wire.
In the second embodiment of the present invention, the plurality of material cavities 1 are respectively arranged on the plurality of feed hoppers 13, the plurality of feed hoppers 13 are arranged on the turntable 14, a screw extruder 15 is transversely arranged below the turntable 14, an inlet 16 corresponding to the discharge port 2 of the material cavity 1 is arranged on the screw extruder 15, and an upper die 9 and a lower die 8 are arranged at an outlet 17 of the screw extruder 15; the rotary table 14 is driven by a motor to rotate, a rotating shaft of the rotary table 14 is connected with an output shaft of the motor through a coupler, and the rotating advancing speed of the screw extruder 15 is matched with the rotating speed of the feed hopper 13; the screw extruder 15 is an existing screw extruder 15, and preferably, the screw extruder 15 is a single screw extruder 15; and each discharge port is provided with a switch valve.
In the second embodiment of the present invention, the discharge ports 2 of the plurality of material cavities 1 are arranged on the same virtual circle.
In the second embodiment of the present invention, a heating assembly 12 is disposed on the screw extruder 15, a cooling assembly 18 is disposed on the lower die 8, and a conveying roller 19 is disposed beside the upper die 9 and the lower die 8; the heating component 12 can adopt the existing heating devices such as an electric heating pipe, an electric heating wire and the like; the cooling unit 18 is an existing cooling device such as a water cooling pipe.
In an embodiment of the present invention, a method for forming a light guide plate forming device with gradually changed quantum dot concentration includes the following steps: the slurry with different concentrations is placed in different material cavities 1, and the slurry with different concentrations is ejected from a discharge port 2 and enters a forming cavity 3 for forming.
In an embodiment of the present invention, a mixed slurry is used which includes: the material comprises red and green quantum dots, a light guide plate optical master batch material, auxiliary diffusion particles and an auxiliary antioxidant; the quantum dot raw material includes, but is not limited to, cadmium selenide (CdSe), perovskite quantum dots, and the like, which may be in a powder or liquid form; the optical master batch material of the light guide plate comprises but is not limited to PMMA, MS material and the like; the specific concentration gradient change amplitude can be distributed in different material cavities 1 according to actual needs.
The method comprises the following steps: adding slurry with different concentrations into each material cavity 1, starting the heating assembly 12, and heating the slurry in the material cavities 1 to a molten state;
step two: the extrusion plate 7 advances to eject the slurry in each material cavity 1 from the corresponding discharge port 2 in advance, the ejection speed is less than or equal to 0.8m/s, and the ejection process is accompanied by the extension of the first partition plate 4, so that the slurry in different material cavities 1 is prevented from being mixed in advance in the molding cavity 3;
step three: after a preset time, the extrusion plate 7 retreats, and the first partition plate 4 retreats to the extrusion cavity 5;
step four: polymerizing the forming cavity 3 after grouting at a low temperature of 50 ℃, heating to 100 ℃ when the polymer in the forming cavity 3 becomes solid basically, and keeping for 2 hours to form the light guide plate doped with quantum dots;
step five: and separating the upper die 9, and taking out the quantum dot light guide plate sample plate with gradually changed concentration.
In the first step of the first embodiment of the present invention, four parts of 500g of light guide plate material polymethyl methacrylate (PMMA) and a certain amount of red and green quantum dots are weighed, wherein the ratio of the red and green quantum dots is 1: 12, controlling the proportion of the red and green quantum dots in the polymethyl methacrylate to be 0.5 percent, 0.6 percent, 0.7 percent and 0.8 percent, and dividing the red and green quantum dots into four groups; the first group of red and green quantum dots are 0.192g and 2.308g, the second group of red and green quantum dots are 0.231g and 2.769g, and the third group of red and green quantum dots are 0.269g and 3.231 g; the fourth group of red and green quantum dots is 0.308g and 3.692; fully and uniformly mixing the four groups of red and green quantum dots, polymethyl methacrylate (PMMA) as a light guide plate material, auxiliary diffusion particles and an auxiliary antioxidant; the four parts of polymethyl methacrylate (PMMA) and red-green quantum dot mixture are sequentially added into the four material cavities 1 according to concentration gradient, the heating component 12 is started to keep the temperature at 150 ℃, and the mixture is heated to a molten state.
In the second embodiment of the present invention:
the method comprises the following steps: adding slurry with different concentrations into each material cavity 1, rotating the rotary disc 14, and sequentially feeding the slurry with different concentrations into the screw extruder 15 through the discharge port 2 and the inlet 16 by the feed hopper 13, wherein the heating temperature of the heating component 12 is 150 ℃ and is always kept in a heating state;
secondly, the screw extruder 15 extrudes the heated and melted slurry from an outlet 17, and the rotation advancing speed of the screw extruder 15 is matched with the rotation speed of the feed hopper 13;
step three: sizing the slurry ejected from the outlet 17 in the molding cavity 3 between the upper die 9 and the lower die 8, performing cold hardening solidification by the cooling assembly 18, keeping the cooling time at 30 minutes, and drawing forward by the conveying roller 19 to obtain the quantum dot light guide plate with gradually changed concentration.
In the first step of the second embodiment of the present invention, four portions of 550g of light guide plate material polymethyl methacrylate (PMMA) and a certain amount of red and green quantum dots are weighed, wherein the ratio of the red and green quantum dots is 1: 12; the proportion of the red and green quantum dots in the polymethyl methacrylate is controlled to be 0.8 percent, 0.9 percent, 1.0 percent and 1.1 percent, and the red and green quantum dots are divided into four groups; wherein the first group of red and green quantum dots are respectively 0.338g and 4.062 g; the second group of red and green quantum dots are 0.381g and 4.569g respectively; the third group of red and green quantum dots are respectively 0.423g and 5.077 g; the fourth group of red and green quantum dots are respectively 0.465g and 5.585 g; the four groups of red and green quantum dots are fully and uniformly mixed with a light guide plate material, namely polymethyl methacrylate (PMMA), auxiliary diffusion particles and an auxiliary antioxidant; the four groups of quantum dot and light guide plate material polymethyl methacrylate (PMMA) mixtures are respectively added into material cavities 1 of four feed hoppers 13, and a heating assembly 12 is started to preheat.
Terms used in any technical scheme disclosed in the invention for indicating position relation or shape include approximate, similar or close state or shape except for other meanings.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a light guide plate forming device of quantum dot concentration gradual change which characterized in that: including a plurality of be used for placing the material chamber of different concentration thick liquids, every the material chamber all is provided with the discharge gate, a plurality of the material chamber corresponds same one and becomes the chamber, a plurality of the material chamber is separated by a plurality of first baffles and is extruded the chamber and form, a plurality of the material chamber sets up side by side and is extruding the intracavity, it sets up in the upper end of extruding the chamber to become the chamber, become the chamber and extrude and be provided with the second baffle between the chamber, a plurality of the discharge gate sets up side by side on the second baffle, the lower extreme of extruding the chamber is provided with stripper plate, a plurality of first baffle sets up side by side and is connected with the stripper plate, set up the guiding hole that a plurality of used for first baffle one-to-one passed on the second baffle.
2. The light guide plate forming device with gradually changed quantum dot concentration according to claim 1, wherein: the forming cavity, the second partition plate, the extrusion cavity and the extrusion plate are sequentially arranged in the lower die from top to bottom, and the upper end of the forming cavity is provided with an upper die.
3. The light guide plate forming device with gradually changed quantum dot concentration according to claim 1, wherein: a plurality of springs are arranged between the second partition plate and the extrusion plate, one ends of the springs are connected with the second partition plate, the other ends of the springs are connected with the extrusion plate, and the springs and the first partition plate are arranged in parallel.
4. The light guide plate forming device with gradually changed quantum dot concentration according to claim 2, wherein: and heating assemblies are arranged on the side wall of the upper die and the first partition plate.
5. A forming method of a light guide plate forming device using quantum dot concentration gradient, which is characterized by comprising the light guide plate forming device of quantum dot concentration gradient according to any one of claims 1 to 4, and comprising the following steps: the slurry with different concentrations is placed in different material cavities, and the slurry with different concentrations is ejected out of the discharge hole and enters the forming cavity for forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811440307.8A CN109605675B (en) | 2018-11-29 | 2018-11-29 | Light guide plate forming device with gradually-changed quantum dot concentration and forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811440307.8A CN109605675B (en) | 2018-11-29 | 2018-11-29 | Light guide plate forming device with gradually-changed quantum dot concentration and forming method |
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| Publication Number | Publication Date |
|---|---|
| CN109605675A CN109605675A (en) | 2019-04-12 |
| CN109605675B true CN109605675B (en) | 2021-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811440307.8A Active CN109605675B (en) | 2018-11-29 | 2018-11-29 | Light guide plate forming device with gradually-changed quantum dot concentration and forming method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57178734A (en) * | 1981-04-27 | 1982-11-04 | Yoshida Kogyo Kk <Ykk> | Automatically changing and supplying method for coloring material in injection molding |
| JPS5884742A (en) * | 1981-11-13 | 1983-05-20 | Fujikura Ltd | Method and apparatus for supplying resin by color |
| JPH09153313A (en) * | 1995-11-30 | 1997-06-10 | Hitachi Cable Ltd | Automatic color changing device for use in plastic extruding/coating work |
| CN101568421A (en) * | 2005-08-31 | 2009-10-28 | 比利鲍勃·J·布尔 | Color variation control process for molding plastic and composite multi-color articles |
| CN207867183U (en) * | 2017-12-29 | 2018-09-14 | 厦门市京骏科技有限公司 | A kind of progressive concentration light guide plate of quantum dot and backlight module |
-
2018
- 2018-11-29 CN CN201811440307.8A patent/CN109605675B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57178734A (en) * | 1981-04-27 | 1982-11-04 | Yoshida Kogyo Kk <Ykk> | Automatically changing and supplying method for coloring material in injection molding |
| JPS5884742A (en) * | 1981-11-13 | 1983-05-20 | Fujikura Ltd | Method and apparatus for supplying resin by color |
| JPH09153313A (en) * | 1995-11-30 | 1997-06-10 | Hitachi Cable Ltd | Automatic color changing device for use in plastic extruding/coating work |
| CN101568421A (en) * | 2005-08-31 | 2009-10-28 | 比利鲍勃·J·布尔 | Color variation control process for molding plastic and composite multi-color articles |
| CN207867183U (en) * | 2017-12-29 | 2018-09-14 | 厦门市京骏科技有限公司 | A kind of progressive concentration light guide plate of quantum dot and backlight module |
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|---|---|
| CN109605675A (en) | 2019-04-12 |
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