TWI333043B - Illuminating device - Google Patents

Illuminating device Download PDF

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Publication number
TWI333043B
TWI333043B TW97101943A TW97101943A TWI333043B TW I333043 B TWI333043 B TW I333043B TW 97101943 A TW97101943 A TW 97101943A TW 97101943 A TW97101943 A TW 97101943A TW I333043 B TWI333043 B TW I333043B
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TW
Taiwan
Prior art keywords
light
guide plate
surface
wavelength
light guide
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TW97101943A
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Chinese (zh)
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TW200933087A (en
Inventor
Chih Ming Lai
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Foxsemicon Integrated Tech Inc
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Priority to TW97101943A priority Critical patent/TWI333043B/en
Publication of TW200933087A publication Critical patent/TW200933087A/en
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Publication of TWI333043B publication Critical patent/TWI333043B/en

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Description

1333043 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an illumination device, and more particularly to an illumination device using a solid-state light-emitting element such as a light-emitting diode. [Prior Art] With the development and advancement of science and technology, Light Emitting Diode (LED) has gradually replaced cold cathode fluorescent light due to its good light quality (that is, the spectrum of light source) and high luminous efficiency. The lamp (Cold Luth Fluorescent Lamp, CCFL) is used as a illuminating element for illumination devices. For details, see Michael S. Shur et al., Proceedings of the IEEE, Vol. 93, No. 10 (October 2005). Solid-State Lighting: Toward Superior Illumination" However, with the popularization of artificial lighting, people are paying more and more attention to the impact of light on the natural environment and human health, such as light pollution (light damage at night), glare caused by human eyes and so on. Glare refers to the irritation of the light source to the eye. Under other conditions, the brighter the light source, the greater the damage to the eye. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide an illumination device that reduces irritation to the eyes. An illumination device includes at least one light-emitting component and a light-guiding plate, the light-guiding plate includes a light-incident surface and a light-emitting surface, and the at least one light-emitting component is disposed opposite to the light-incident surface, and the light guide plate is provided with a plurality of recesses. The plurality of recesses are provided with a fluorescent substance, and the at least one light emitting element emits light of a first wavelength and the coupling 1330443 enters the light guide plate, and the light of the first wavelength of one part of the light into the distribution ui light guide plate is converted by the light substance. At least a second wavelength of light, the at least - second wavelength of light mixed with the other portion of the first wavelength of the light emitting element to form white light. The illumination device includes at least one light-emitting element and a light guide plate, and the light guide plate includes a light surface, a light-emitting surface, and a bottom surface opposite to the light-emitting surface. The light-emitting element is disposed opposite to the human light surface. The light-emitting surface is provided with a depression. The phosphor is formed on the bottom surface, and the light-emitting element _: wavelength light is coupled into the light guide plate to enter the portion-first wavelength of the light guide plate. The light is converted into light of at least a second wavelength via the fluorescent material, and the light of the at least first wavelength is mixed with another portion of the first wavelength emitted by the light emitting element to form white light. Compared with the prior art, the light-emitting material is formed on the light guide plate in the illumination device, so that the light emitted by the light-emitting element is converted into light of at least another wavelength via the fluorescent substance, and finally mixed to form white light, so as to facilitate In the field of illumination, the light emitted by the light-emitting element is absorbed by the fluorescent material and converted into light of different angles, and is evenly distributed on the light-emitting surface of the light guide plate, so that the light-emitting surface can be reduced. The brightness of the light, thereby reducing or eliminating the appearance of glare, and producing a soft and comfortable effect, reducing the irritation to the eyes. In addition, the recess on the light guide plate can reduce or avoid the total reflection of the light emitted by the light-emitting diode on the surface of the light guide plate, thereby improving the utilization of light. [Embodiment] Hereinafter, the present invention will be further described with reference to the accompanying drawings in conjunction with the specific embodiments. 1 is a schematic cross-sectional view of a lighting device 10 according to a first preferred embodiment of the present invention. The lighting device 10 includes a light emitting device, a light guide plate 13, and a plurality of phosphors 15. In the embodiment, the light emitting device is a light emitting device. Light Emitting Dipole 11 ° The light emitting diode 11 is selected from one or more of various light emitting diodes having an ultraviolet light (UV light) to a blue green light, and is disposed on the side of the light guide plate 13 And adjacent to the light guide plate 13, equivalent to the main light source. The light guide plate 13 has a light transmitting property, and is made of a transparent material such as silicone, resin, glass, acrylic, and chemical name polyacrylic acid. Polymethyl methacrylate (PMMA), quartz (quartz), polycarbonate (PC), epoxy, polyacrylate, etc., the light guide plate 13 The light transmittance is at least 70% and the refractive index is 1.4 to 1.7. The light guide plate 13 has a flat plate shape, and has a light incident surface 136, a light emitting surface 132, and a bottom surface 137 disposed opposite to the light emitting surface 132. The light incident surface 136 is adjacent to the light emitting diode 11 and the bottom surface 137 A reflective layer 131 is disposed thereon. The reflective layer 131 is plated with a high reflectivity material, such as ink, metal material, etc., and the metal material may be mercury, gold, gold, copper, etc., to reflect light incident into the light guide plate 13 as much as possible. Face 132, thereby increasing the light extraction efficiency of the illumination device 10. In this embodiment, the reflective layer 131 is disposed on the bottom surface 137 of the light guide plate 13. Of course, the reflective layer 131 can also be disposed on the side of the light guide plate 13 facing the light emitting diode 11. 1333043 The light-emitting surface 132 is spaced apart from the plurality of tiny recesses 133. The recesses 133 have a diameter of no more than 5 mm, and each recess 133 has at least one inclined side 135. The inclined side 135 can be a smooth plane or a smooth surface. , • Such as paraboloids, etc. The depressions 133 may be distributed in strips or dots on the light exit surface 132. The recesses 133 can break the original smooth light-emitting surface of the light guide plate 13 and prevent the light emitted from the light-emitting diode 11 from being totally reflected at the light-emitting surface 132, and smoothly penetrate the light-emitting surface 132 to emit the light. Light guide plate 13. At the same time, the recesses 132 can reduce the incident angle* of the light that is incident on the light-emitting surface 132, so that the light forms irregular refraction at the light-emitting surface 132, so that the light emitted from the light-emitting surface 132 is not concentrated toward a certain A specific direction to produce an even distribution effect. In addition, the surface of the depressions 133 may be further roughened to further cause irregular refracting of the light at the light exit surface 132. The recesses 133 on the light-emitting surface 132 can be fabricated by using embossing, micro-electromechanical (MEMs) methods, or by semiconductor processes, such as lithography, etching, etc. It is produced by a method of molding, such as injection molding. The phosphor 15 is disposed in a recess 133 on the light-emitting surface 132 of the light guide plate 13. The phosphor 15 is equivalent to a secondary light source. The combination of the phosphor 15 and the LED 11 can be selected from the group consisting of: Light and blue diodes, red and green phosphors and blue LEDs, and red, green, and blue phosphors and ultraviolet diodes. The fluorescent substance 15 is excited by a part of the light emitted by the light-emitting diode 11 and converted into light emitted from different angles. The wavelength of the light emitted by the fluorescent substance 15 is greater than the wavelength of the light emitted by the light-emitting diode 11 . The light emitted from the phosphor 15 is combined with the other portion 1333304 emitted from the LED 11 to form a white light. The material constituting the fluorescent substance 15 may be a sulfide, an aluminate, an oxide, a silicate, a nitride or the like. * When the fluorescent substance 15 is filled in the recess 133 on the light-emitting surface 132, the fluorescent substance 15 may be first mixed in a liquid colloid such as resin, epoxy resin, silicone or the like, and thermosetting polymerization. In the ultraviolet curable polymer, the mixture is coated or tiled on the surface of the light guide plate 13, filled with all the recesses 133, and cured by heating or irradiation with ultraviolet light. By mixing with the colloid, the fluorescent substance 15 prevents the fluorescent substance 15 from directly contacting the outside air, prevents the fluorescent substance 15 from absorbing moisture in the outside air, and simplifies the filling process. When the illuminating device 10 is in operation, the light emitted by the illuminating diode 11 is coupled into the light guiding plate 13 by the light incident surface 136, and a part of the light is directly incident on the light emitting surface 132 of the light guiding plate 13, and another part of the light passes through the light illuminating surface 132. The reflective layer 131 of the light guide plate 13 is reflected and incident on the light exit surface 132. a portion of the light that is incident on the light-emitting surface 132 $ is directed toward the portion of the light-emitting surface 132 that is not recessed, and is directly emitted from the light-emitting surface 132 through the light-receiving surface 132; and a portion of the light that is incident on the light-emitting surface 132 passes through the light-emitting portion The recess 133 on the surface 132 is refracted at the inclined side surface 135 of the recess 133, and the phosphor 15 in the excitation recess 133 emits light emitted from different angles, and exits the light guide plate 13; and is directed toward the light exit surface 132. A part of the light is reflected by the light-emitting surface 132 and the reflective layer 131 one or more times, and finally the phosphor 15 in the recess 133 on the light-emitting surface 132 is excited, and the light guide plate 13 is emitted from different angles. In the illumination device 10, the light-emitting diode 11 is disposed on the light-incident surface 133 of the light guide plate 13 (S) 11 1333043, and the phosphor 15 is disposed on the light-emitting surface 132 of the light guide plate 13, that is, the light-emitting surface The diode 11 is disposed opposite to the phosphor 15 to prevent the fluorescent substance 15 from being heated, which is advantageous for reducing the ambient temperature of the fluorescent substance 15, thereby improving the life of the illumination device 10 and its light conversion efficiency. In addition, the recess 133 on the light-emitting surface 132 of the light guide plate 13 can reduce or avoid the total reflection of the light emitted by the light-emitting diode 11 on the light-emitting surface 132, thereby improving the utilization of light. Then, the phosphor material 15 is distributed in the recess 133 on the light-emitting surface 132, so that the light emitted by the light-emitting diode 11 passes through the I light guide plate 13 to excite the fluorescent material 15 to emit light at different angles, and The light-emitting surface 132 of the light guide plate 13 is emitted, so that the light is evenly distributed on the light-emitting surface 132, that is, the light emitted by the bright-emitting light-emitting diode 11 is uniformly dispersed to a large-area light-emitting surface 132. On, thereby reducing or eliminating the appearance of glare, and producing a soft and comfortable effect, reducing the irritation to the eyes. Furthermore, the fluorescent substance 15 absorbs a part of the light emitted by the light-emitting diode 11 and converts it into light having a longer wavelength, and the φ light emitted from the fluorescent substance 15 and another part emitted by the light-emitting diode 11 The light mixes to form a white light for use in the field of illumination. Of course, the position of the light-emitting diode 11 is not limited to the side of the light guide plate 13, as shown in FIG. 2, the illumination device 20 of the second embodiment of the present invention, the light-emitting diode 21 is disposed on the guide In the light panel 23, the light-emitting diode 21 is covered by the light guide plate 23 and spaced apart from the phosphor material 15. The portion of the light guide plate 23 opposite to the light-emitting diode 21 is the light-incident surface 236. Further, the above-described arrangement of the recesses 133 may be in other forms as in the following embodiments. 12 1333043 The illuminating device 30 of the third preferred embodiment of the present invention, as shown in FIG. 3, wherein the recesses 333 on the light-emitting surface 332 of the light guide plate 33 are adjacent to each other. The way in which the light is transmitted in the device 30 is substantially the same as in the first preferred embodiment. The illumination device 40 of the fourth preferred embodiment of the present invention, as shown in FIG. 4, wherein the aperture 433 of the light-emitting surface 432 of the light guide plate 43 has a different diameter and depth, and the farther away from the light-emitting diode 11, the recess 433 The larger the aperture is, the deeper the depth is, the light emitted by the LED 11 is directed to the portion of the light-emitting surface 432 away from the LED 11 via the light guide plate 43. Since the recess 433 has a larger aperture and a deeper depth, the depth is deeper. The light can be evenly distributed on the light exit surface 432 of the light guide plate 43. The mode of light transmission in the illumination device 40 is substantially the same as in the first preferred embodiment. As shown in FIG. 5, the illuminating device 50 of the fifth preferred embodiment of the present invention is characterized in that the recess 533 is distributed on the bottom surface 537 of the light guide plate 53. In operation, the light emitted by the LED 11 is coupled into the light guide plate 53 by the light incident surface 136, and a part of the light is directly incident on the light exit surface 132 of the light guide plate 53. • Another portion of the light is incident on the light guide plate. The bottom surface 537 of the 53 is refracted through the recess 533 on the bottom surface 537, and is refracted at the inclined side 135 of the recess 533. The phosphor 15 in the excitation recess 533 emits light emitted from different angles, and the fluorescent substance 15 emits A part of the light is directly incident on the light-emitting surface 132, and another part of the light emitted by the fluorescent material 15 is incident on the reflective layer 131 and reflected by the reflective layer 131 to the light-emitting surface 132. A portion of the light that is incident on the light-emitting surface 132 is directly emitted from the light-emitting surface 132 through the light-receiving surface 132; and another portion of the light that is incident on the light-emitting surface 132 is reflected toward the bottom surface 537 via the light-emitting surface 132, thereby exciting the bottom surface 537. The phosphor 15 in the upper recess 533 emits 13 1333043 'light emitted from different angles, and finally reflects and refracts one or more times through the light-emitting surface 132 and the reflective layer 131, and the light guide plate 53 is emitted from different angles. 6 is a lighting device 60 according to a sixth preferred embodiment of the present invention. The lighting device 60 is a combination of the lighting device 40 of the fourth preferred embodiment and the lighting device 50 of the fifth preferred embodiment. That is, the recesses 633 are simultaneously distributed on the light emitting surface 632 and the bottom surface 637 of the light guide plate 63. For the light transmission mode of the illumination device 60, please refer to the first and fifth preferred embodiments. Furthermore, the arrangement of the above-mentioned phosphor material 15 may be in other forms as in the following embodiments. FIG. 7 shows a lighting device 70 according to a seventh preferred embodiment of the present invention. The lighting device 70 is different from the lighting device 10 of the first preferred embodiment in that the phosphor material 75 is distributed at the mesh point. The bottom surface 737 of the light plate 73 is interposed between the bottom surface 737 of the light guide plate 73 and the reflective layer 131, and is not disposed in the recess 133 of the light exit surface 732. The light emitted by the LED 11 is directed to the phosphor 75 on the bottom surface 737, and the phosphor 75 is excited to emit light at different angles, and is refracted at the recess 133 to finally emit the guide. Light exit surface 732 of light panel 73. The phosphor material 75 can be distributed on the bottom surface 737 of the light guide plate 73 by printing or the like. FIG. 8 is a illuminating device 80 according to an eighth preferred embodiment of the present invention. The illuminating device 80 simultaneously fills the illuminating surface 832 of the light guide plate 83 on the light-emitting surface 832 of the light guide plate 83 on the basis of the seventh preferred embodiment. Inside the depression 833. FIG. 9 shows a illuminating device 90 according to a ninth preferred embodiment of the present invention. The illuminating device 90 includes a light guide plate 93, a plurality of light emitting diodes 91, and a plurality of optical coupling elements corresponding to the light emitting diodes 91, respectively. 97. 1333043 The light guide plate 93 is of the same material as that of the light guide plate 13 of the first preferred embodiment. The light guide plate 93 has a light incident surface 931 and a light emitting surface 932 disposed opposite to the light incident surface 931 ′. The light emitting surface 932 is provided with a plurality of recesses 933 adjacent to each other, and the recess 933 is provided therein. a fluorescent substance 95 which is excited by a portion of the light emitted by the light-emitting diode 91 and emits light emitted from different angles. The light emitted from the fluorescent substance 95 has a wavelength greater than that of the light-emitting diode 91. The wavelength of the light emitted by the phosphor material 95 is mixed with another portion of the light emitted by the light-emitting diode 91 to form a white light. The fluorescent substance 95 is the same as the fluorescent substance 15 described in the first preferred embodiment. The light-coupled elements 97 are each in the shape of a truncated cone having a side coupled to the light surface 971 at one of the top ends, a light-emitting surface 972 at the bottom end, and a side inclined to be coupled to the light-emitting surface 972 and the coupled light-emitting surface 972. 973, the coupled light incident surface 971 and the coupled light output surface 972 are respectively adjacent to the light-emitting diode 91 and the light-incident surface 931 of the light guide plate 93. The inclined side surface 973 can be a smooth plane or a smooth curved surface, such as a paraboloid. The optical coupling elements 97 have the characteristics of light transmission, and the materials constituting the optical coupling elements 97 are substantially the same as the materials constituting the light guide plate 93, such as silicone rubber, etc., and the light transmittance of the optical coupling elements 97 is at least 70%, the refractive index is 1.4 to 1.7. When the illuminating device 90 is in operation, the illuminating diodes 91 emit light and are respectively coupled into the optical coupling element 97 by the coupling light 971 of the optical coupling element 97, and occur at the inclined side 973 of the optical coupling element 97. Total reflection, the light-coupled element 97 is emitted from the light-emitting surface 972, and light emitted from the light-coupled element 97 enters the light guide plate 93 through the light-incident surface 931 of the light guide plate 93, and is incident on the light-emitting surface of the light guide plate 93. 932, the light that is incident on the light-emitting surface 932 is refracted by the recess 933 on the light-emitting surface 932 by the <S) 15 1333043, and is refracted at the inclined side 935 of the recess 933, and is absorbed by the fluorescent substance 95 in the recess 933. Light that is converted into light from different angles is emitted from the light guide plate 93. • Of course, the optical coupling elements 97 may be disposed separately from the light guide plate 93 or may be integrally formed with the light guide plate 93. The inclined side 973 of the optical coupling element 97 can also be plated with a material having a high reflectance to prevent light from leaking out of the inclined side 973. The above lighting devices 10, 20, 30, 40, 50, 60, 70, 80, 90® are widely used for interior lighting, interior lighting, indoor lighting, such as table lamps, ceiling lights, and the like. A backlight for a kanban or display. In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application in this case. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are intended to be included in the scope of the claims below. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a lighting device according to a first preferred embodiment of the present invention. Figure 2 is a schematic cross-sectional view showing a lighting device in accordance with a second preferred embodiment of the present invention. Figure 3 is a cross-sectional view showing a lighting device in accordance with a third preferred embodiment of the present invention. 4 is a cross-sectional view of a lighting device according to a fourth preferred embodiment of the present invention;

c S 16 1333043 Figure. Figure 5 is a cross-sectional view showing a lighting device in accordance with a fifth preferred embodiment of the present invention. Figure 6 is a cross-sectional view showing a lighting device in accordance with a sixth preferred embodiment of the present invention. Figure 7 is a cross-sectional view showing a lighting device in accordance with a seventh preferred embodiment of the present invention. Figure 8 is a cross-sectional view of a lighting device in accordance with an eighth preferred embodiment of the present invention. Figure 9 is a cross-sectional view showing a lighting device in accordance with a ninth preferred embodiment of the present invention. [Description of main component symbols] Illumination device 10 ' 20 ' 30, 40, 50 ' 60, 70, 80, 90 Light-emitting diodes 11, 21, 91 Light guide plates 13, 23, 33, 43 , 53 , 63 , 73 , 83, 93 reflective layer 131 light-emitting surface 132 ' 332 ' 432, 632 ' 732, 832 ' 932 recess 133, 333, 433, 533, 633, 833, 933 side 135 ' 935 > 973 light-emitting surface 136, 236, 931 The bottom surface 137, 537 '637, 737 phosphor material 15, 75, 85, 95 optical coupling element 97 is lightly coupled to the light surface 971 and coupled to the light surface 972 17

Claims (1)

1333043 X. Patent Application No. 1> A lighting device comprising at least one light-emitting element and a light guide plate, the light guide plate comprising a human light surface and a light-emitting surface, the at least light-emitting element being disposed opposite to the light-incident surface, The improvement is that the light guide plate is provided with a plurality of recesses, and the plurality of recesses are provided with a fluorescent substance, and the at least one light-emitting element emits light of a first wavelength and is lightly incorporated into the light guide plate to enter the guide wire. The light of the first wavelength is converted into light of at least a second wavelength by the fluorescent substance, and the light of the at least one second wavelength is mixed with another part of the light of the first wavelength emitted by the light emitting element to form white light. 2. The illumination device of claim i, wherein the illumination device is greater than the first wavelength. The illuminating device of the present invention, wherein the plurality of recesses are disposed on the bottom surface of the light guide plate and the illuminating surface. Relatively set and the discs are placed adjacent to the light side. 8. If the application for the patent garden is the first, it is also placed on the bottom surface of the light guide. The illumination device of the present invention, wherein the plurality of recessed light surfaces and the illumination device disposed opposite to the light-emitting surface, wherein the plurality of recesses 6. are spaced apart from the light guide plate according to the first interval of the patent application The illumination device of claim 1, wherein the plurality of depressions are disposed adjacent to each other on the light guide plate. 8. The illumination device of claim 6 or claim 7, wherein the recess 18 S 9. gradually increases from the direction of the at least light-emitting element. The bottom surface and the exit side layer are disposed on the bottom of the light guide plate, and further include a reflective surface disposed opposite to the light incident surface. 10. The illuminating device of claim 1, wherein the illuminating material is broad, the salt, the oxide, and the illuminating material, wherein the illuminating material is separated from the illuminating material. , oxalate or nitride. The illumination device of the first aspect of the present invention, further comprising: at least a light-combining component corresponding to the second day=piece, wherein the light coupling element is made between the light surface 4, and is disposed on the At least the illuminating device and the light guide plate of the illuminating device of claim 12, wherein the at least one optical coupling element has a truncated cone shape. The illumination device includes at least one light-emitting element and a light guide plate, and the light-incident surface, a light-emitting surface, and the light-emitting surface are disposed opposite to the light-emitting surface, and the at least one light-emitting element is disposed opposite to the light-incident surface. The improvement is characterized in that a plurality of depressions are formed on the small light-emitting surface, and a fluorescent substance is formed on the bottom surface, and the inner light-emitting element emits light of a first wavelength and is coupled into the light guide plate to drag & enter a part of the light guide plate. The light of one wavelength is transferred to the second wavelength of light via the fluorescent substance, and the light of the at least one second wavelength is mixed with the other part of the first wavelength of the light emitting element to form white light. 15. The illumination device of claim 14, wherein the second wavelength is greater than the first wavelength. The illuminating device of claim 19, wherein the luminescent material is also disposed in the plurality of recesses. Side 丄 7. The illuminating reflective layer as claimed in the patent application, the reflective layer is disposed on the bottom surface of the light guide plate
20
TW97101943A 2008-01-18 2008-01-18 Illuminating device TWI333043B (en)

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TW97101943A TWI333043B (en) 2008-01-18 2008-01-18 Illuminating device

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Publication number Priority date Publication date Assignee Title
TWI461626B (en) * 2009-12-28 2014-11-21 Chi Mei Comm Systems Inc Light source device and portable electronic device using the same
TW201227092A (en) 2010-12-31 2012-07-01 Ind Tech Res Inst Mixing light module
TWI469378B (en) * 2011-12-30 2015-01-11 Ind Tech Res Inst Fluorescent column embedded solar collector, method thereof and solar cell module
CN103375702A (en) 2012-04-23 2013-10-30 展晶科技(深圳)有限公司 LED light-emitting device
TWI594054B (en) 2016-11-04 2017-08-01 友達光電股份有限公司 Backlight module having quantum dot and manufacturing method thereof

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