KR20160035156A - Lightihng module and backlight unit comprising quantom dot light conversion photoluminescence - Google Patents

Abstract

The present invention relates to a light source package and a backlight unit including a quantum dot light conversion unit. According to one aspect of the present invention, the light source package includes: a reflection unit reflecting light of a light source of a light source unit to a quantum dot light conversion unit; and a quantum dot light conversion unit converting an incident light into a light in a different wavelength band and emitting the converted light. Therefore, the present invention can increase luminous efficacy of the light source forming the backlight unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light source package and a backlight unit including a quantum dot light conversion unit,

The present invention relates to a light source package including a quantum dot light conversion portion and a backlight unit.

In general, a light emitting diode (hereinafter referred to as an LED) refers to a light emitting diode that can realize various colors by configuring a light emitting source by changing a compound semiconductor material such as GaAs, AlGaAs, GaN, InGaN and AlGaInP Semiconductor device.

The LED package may be used as a backlight unit of a liquid crystal display, or may be used as a lighting device, a headlight, or the like. In a light emitting package such as an LED package, luminous efficiency is important, and a technology for improving the luminous efficiency in producing an LED package is important.

In recent years, in order to increase the color reproduction rate of the liquid crystal display device, a backlight unit including a quantum dot, which is a separate light converting means, is provided to use a blue LED instead of a normal white LED as a light source, However, when the above-described quantum dot is used to increase the color reproduction rate, deterioration of the quantum dot member due to heat emitted from the LED occurs, which is disadvantageous in implementation of a high luminance and increases manufacturing cost. There is a need for measures to solve this problem.

In view of the foregoing, it is an object of the present invention to prevent the deterioration of the quantum dot member by separating the quantum dot member for converting white light from the light emitting diode from the constituent elements constituting the backlight unit.

And to provide a reflective portion for blocking the heat of the plurality of light sources constituting the backlight unit but allowing the light of the light sources to enter the quantum dot member.

Further, the objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, in one aspect, the present invention provides a liquid crystal display device including: a reflection unit that reflects light of a light source of a light source unit to a quantum dot light conversion unit; a quantum dot light source that converts incident light into light of a different wavelength band, A light source package including a conversion unit is provided.

According to another aspect of the present invention, there is provided a quantum dot light-emitting device including: a reflection unit that reflects light of a light source of a light source unit to a quantum dot light conversion unit; a quantum dot light conversion unit that converts incident light into light of a different wavelength band and emits the light; And a light guide plate for emitting white light emitted from the light guide plate to the liquid crystal display panel.

As described above, according to the present invention, the light emitting efficiency of the light source constituting the backlight unit is enhanced.

According to the present invention, the quantum dot member for converting the light of the blue light emitting diode into white is formed away from the light emitting diode, thereby preventing deterioration of the quantum dot member, thereby improving reliability.

In addition, since the quantum dot member is not attached to the front surface of the display device but is formed in proportion to the size of the light emitting diode, the size of the quantum dot member is reduced, and the white light conversion effect is maintained.

FIG. 1 is a view showing the structure of a liquid crystal display device 100 according to the embodiments.
FIG. 2 is a diagram illustrating a backlight unit 120 of a direct-type and an edge-type according to embodiments.
FIG. 3 is a diagram illustrating an emission spectrum when a blue LED and a QD material are combined according to an embodiment of the present invention.
4 is a diagram showing a structure of a quantum dot used in an embodiment of the present invention.
5 and 6 are views showing a structure in which the quantum dots used in an embodiment of the present invention are combined with a backlight unit.
7 is a view illustrating a light source package mounted on a backlight unit according to an embodiment of the present invention.
8 is a sectional view of the light source package of FIG. 7 according to an embodiment of the present invention.
FIG. 9 is a diagram showing a path of light on a sectional view of FIG. 8 by black lines. FIG.
10 shows a configuration of a light source package in which a polygonal reflector according to an embodiment of the present invention is configured.
11 is a view showing a configuration of a light source package in which a curved reflector according to an embodiment of the present invention is configured.
FIG. 12 is a view illustrating a configuration of a light source package having protrusions protruding from a reflective portion according to an exemplary embodiment of the present invention. Referring to FIG.
13 is a view illustrating a configuration of a light source package to which a prism-shaped reflector according to another embodiment of the present invention is coupled.
FIG. 14 is a view showing a configuration of a light source package to which a transparent circular reflecting portion according to another embodiment of the present invention is combined.
15 is a view showing the temperature in the light source package according to the embodiment of the present invention.
16 and 17 are diagrams showing the results of measurement of luminance according to each embodiment of the reflector of the present invention.
Fig. 18 is a diagram showing the result of measuring the screen brightness in the case of using the reflector as shown in Fig. 8. Fig.
FIG. 19 is a diagram illustrating a configuration of a light source unit and a quantum dot light conversion unit according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

FIG. 1 is a view showing the structure of a liquid crystal display device 100 according to the embodiments.

1, a liquid crystal display 100 according to embodiments includes a liquid crystal display panel 110 for displaying an image, a backlight unit (BLU) 110 for emitting light to a liquid crystal display panel 110, A backlight unit 120, a driving circuit unit 130 for driving the liquid crystal display panel 110, and a chassis unit 140 for connecting the components together.

The liquid crystal display panel 110 described above includes a TFT-array substrate 111 on which a thin film transistor (TFT) is formed, a color filter (CF) And the liquid crystal is injected between the TFT-array substrate 111 and the color filter substrate 112. In this case, the color filter substrate 112 is spaced apart by a predetermined gap (Cell Gap).

The drive circuit unit 130 includes a plurality of driver ICs for operating the liquid crystal display panel 110 and a printed circuit board (PCB) on which various circuit elements are mounted .

Here, the plurality of driver ICs includes at least one gate driver IC and at least one data driver IC.

These driver integrated circuits are connected to the TFT-array substrate 111. As a method for connecting the driver integrated circuit to the TFT-array substrate 111, there is a method in which a driver integrated circuit is mounted on a film and a Tape Carrier Package (TCP) mounting method using TAB (Tape Automated Bonding) And a chip on glass (COG) mounting method in which a bonding pad formed on a TFT-array substrate 111 is directly connected. In addition to this, a driver integrated circuit and a TFT-array substrate 111 are electrically connected Any way is possible.

The driving circuit unit 130 includes a timing controller for generating an electric signal for controlling a plurality of driver ICs and controlling a digital data signal input from the outside.

The backlight unit 120 described above forms a surface light source having a uniform brightness using a light source device and provides the surface light source to the liquid crystal display panel 110.

In the embodiments described herein, the light source device uses, for example, a light emitting diode (LED) chip as a light source.

The backlight unit 120 may be a direct BLU (Backlight Unit) or an edge BLU according to a method of installing the light source device.

FIG. 2 is a diagram illustrating a backlight unit 120 of a direct-type and an edge-type according to embodiments.

Referring to 291 of FIG. 2, when the backlight unit 120 is a direct-type BLU, the light source device 200 in the backlight unit 120 is closely located below the liquid crystal display panel 110, To light.

Referring to 292 of FIG. 2, when the backlight unit 120 is an edge type BLU, the backlight unit 120 is positioned such that the light source device 200 is positioned on the side surface of the liquid crystal display panel 110, A light guide panel 210, and a reflector 220. The light incident from the light source device 200 located on the side of the liquid crystal display panel 110 is reflected by the reflection plate 220 along the light guide plate 210 and irradiated to the liquid crystal display panel 110.

Meanwhile, the light source device 200 of the backlight unit 120 according to the embodiments includes an LED chip as a light source.

The light source device 200 of the backlight unit 120 according to the embodiments may use an LED chip. In this case, a quantum dot (QD) member is used to reproduce a color, Can be diffused.

The core of the backlight unit technology for increasing the color reproduction rate is a full width at half maximum (FWHM) corresponding to the red / green / blue peak of the spectral spectrum of the backlight unit. ). Since the QD material is a nano-scale material, the half-width of the emission spectrum can be significantly reduced as compared with conventional LED inorganic phosphors. In the case of green, the half width is 30 nm. In the case of red, the half width is 40 nm.

FIG. 3 is a diagram illustrating an emission spectrum when a blue LED and a QD material are combined according to an embodiment of the present invention. 310 indicates the peak of the spectrum emitted from the blue LED, 320 indicates the peak of the spectrum emitted through the green QD, and 330 indicates the peak of the spectrum emitted through the red QD.

4 is a diagram showing a structure of a quantum dot used in an embodiment of the present invention. Quantum dots can use CdSe / ZnS nanoparticles in a core-shell structure and an organic ligand is formed outside the shell. In one embodiment of the quantum dot, the structure of the core 410, the shell 420, and the ligand 430 is a structure in which the core is CdSe, the shell is ZnS, and the ligand is an organic ligand.

5 and 6 are views showing a structure in which the quantum dots used in an embodiment of the present invention are combined with a backlight unit.

The method of applying the QD member to the backlight unit can be divided into the structures 291 and 292 of FIG. 2 previously.

5 is a view showing a QD sheet (quantum dote sheet) method applicable to a backlight unit such as 291 of FIG. The QD sheet 510 may be formed in the form of an optical sheet bonded to a resin and bonded to a backlight unit, and excited by QD using a short wavelength blue LED light to generate white light.

FIG. 6 is a view showing a QD rail (quantum dote rail) system applicable to a backlight unit such as 292 in FIG. The QD rail 610 can generate white light by locating the QD material in a glass tube and sealing the QD rail on the opposite surface of the blue LED array.

The above-mentioned QD sheet is expensive, and the QD rail is close to the light source and may be deteriorated. That is, the QD sheet increases in price in proportion to the size of the display device when the backlight unit sheet is produced in a large-area display device. On the other hand, when the QD rail is close to the LED device, the LED device receives heat as well as light from the LED light source, resulting in deterioration of the QD material. Therefore, when heat is applied to the QD, the QD lattice is broken due to the difference in thermal expansion between the core and the shell of the quantum shown in FIG. 4, and the luminance of the backlight unit and the color coordinate may change due to deterioration of the QD material.

Accordingly, the present invention discloses a backlight unit equipped with a light source package and a light source package formed by separating a QD material for converting light from an LED light source.

7 is a view illustrating a light source package mounted on a backlight unit according to an embodiment of the present invention.

The light source package 700 includes a light source unit 710, a reflection unit 720, and a quantum dot light conversion unit 730. The light source unit 710 includes a plurality of light sources, and provides light to the backlight unit. The reflection unit 720 reflects the light emitted from the light source unit and enters the quantum dot light conversion unit 730. The quantum dot light converting unit 730 converts the light of the specific wavelength band (light of the first wavelength band) incident from the reflector 720 into light of the other wavelength band (either the second wavelength band or the light of the third wavelength band) Light of one or more bands). It can be in the form of a rod like the above-mentioned QD rail, or in the form of a sheet like a QD sheet. For example, when blue light is emitted from the light source unit 710, the light is reflected by the quantum dot light conversion unit 730 through the reflection unit 720 and is incident thereon. The quantum dot light converting unit 730 again converts the incident blue light into green light and red light and emits the blue light. As a result, the white light enters the backlight unit through the blue light, the green light, and the red light. A blue light emitting diode is provided instead of the white light emitting diode and the blue light is converted into the white light through the quantum dot light converting unit 730 in the red and green wavelength bands.

The wavelength bands of blue light, green light, and red light can be set according to the display device. For example, as shown in FIG. 3, the wavelength band can be set based on the lowest point of the graph having the peaks of 310, 320, and 330 at the most. 3, the wavelength of the blue light may be 400 nm to 482 nm, the green light may be 482 nm to 575 nm, and the red light may be 575 nm to 700 nm. In another embodiment, the blue light is limited to a wavelength band of 400 nm to 460 nm, the green light is limited to a wavelength band of 490 nm to 560 nm, and the red light is limited to a wavelength range of 551 nm to 660 nm It can be limited to a wavelength band.

The definition of each wavelength band can be variously set according to the characteristics of the display device and the backlight unit.

7, the light from the light source unit 710 is reflected by the quantum dot light converting unit 730 and is incident on the light source unit 710, The quantum dot light converting unit 730 is protected from the heat of the light source unit 710 to prevent damage to the quantum dot light converting unit 730. [ 7, the light of the light source unit 710 having a plurality of light sources is reflected by the reflection unit 720 and is reflected by the quantum dot light conversion unit 730 and is incident. In this process, The light in the wavelength band is converted into the light in the second wavelength band or the third wavelength band while passing through the quantum dot light converting unit 730 and is output. Also, since the heat of the light source unit 710 is not directly transmitted to the quantum dot light conversion unit 730, the light is reflected, thereby assuring the reliability of the quantum dot light conversion unit 730.

The light source package of FIG. 7 is combined with the light guide plate 210 shown in FIGS. 1, 5, and 6 to form a backlight unit.

8 is a sectional view of the light source package of FIG. 7 according to an embodiment of the present invention. The light emitted from the light source unit 710 is reflected by the reflection unit 720 and enters the quantum dot light conversion unit 730. Between the light source unit 710 and the quantum dot light conversion unit 730, a heat end 750 for blocking heat is formed to block heat transfer from the light source unit 710. The material of the end portion 750 may be a non-metallic material. The light converted by the quantum dot light converting unit 730 is transmitted to the light guide plate 210, and enters the liquid crystal display panel. In more detail, the quantum dot light converting unit 730 includes a quantum dot layer 735 in which a plurality of quantum dots are scattered and located, and a protective layer 739 that is located on the quantum dot and blocks the quantum dot from the air . The protective layer 739 transmits light without conversion and prevents the quantum dot layer 735 from being exposed to air or heat so as to maintain the light conversion performance of the quantum dot layer 735 and maintain the reliability of the quantum dot layer 735 do.

8, the light source unit 710 is positioned at the lower end of the light guide plate 210, and the light source unit 710 is attached to the metal fixture 790. The quantum dot light converting unit 730 having the QD member as an example is attached to one side of the light guide plate 210 and the quantum dot light converting unit 730 and the light source unit are provided with a train end 750 Is formed. The light emitted from the light source is reflected by the reflection portion having two or more inclined surfaces and is incident on the quantum dot light converting portion 730. The incident light is converted by the quantum dot light converting part 730 and emitted to the light guiding part 210.

FIG. 9 is a diagram showing a path of light on a cross-sectional view of FIG. Light generated in the light source unit 710 is reflected at a high density in the reflection unit 720, and the reflected light is incident on the quantum dot light conversion unit 730 again. The quantum dot light converting unit 730 converts incident light into another wavelength band and outputs the converted light to the light guide plate 210.

In Fig. 9, the reflection portion may have two or more inclination angles. That is, the reflector 720 having the two reflectors and the vertical reflector in the up and down diagonal lines may have two inclination angles, and the reflector can be formed by combining a larger number of reflectors to improve the reflection performance.

7 to 9, when the present invention is applied, a QD phosphor, which is a white conversion photoluminescence material, is protected from the heat of the light source to secure the reliability of the QD phosphor, Compared with the case of FIG. 5, a backlight unit of a color reproduction display device having price competitiveness can be realized.

In FIGS. 7 to 9, the shape of the reflector is shown in the configuration of the reflector. However, the configuration of the reflection portion may have various shapes that can more effectively introduce the light from the light source into the quantum dot light conversion portion.

10 shows a configuration of a light source package in which a polygonal reflector according to an embodiment of the present invention is configured. The reflecting portion may have a plurality of inclination angles. The reflector 720a is composed of five reflectors. This is to cause the light of the light source unit 710 to enter the quantum dot light conversion unit 730 with a short optical path without loss. The angle formed by the reflection plates of the reflection unit 720a may be variously determined according to the number of the light source units 710, the angle of the light source unit 710, and the like. Also, the number and angle of the reflection plates can be determined according to the density of the quantum dots of the quantum dot light converting unit 730, the size of the quantum dot light converting unit 730, and the like.

11 is a view showing a configuration of a light source package in which a curved reflector according to an embodiment of the present invention is configured. The reflector 720b is formed of a curved reflector. This is to cause the light of the light source unit 710 to enter the quantum dot light conversion unit 730 with a short optical path without loss. The curvature of the reflection plate of the reflection unit 720b may be variously determined according to the number of the light source units 710, the angle of the light source unit 710, and the like. In addition, it is possible to combine a curved reflector and a planar reflector according to the density of the quantum dot of the quantum dot light converting portion 730 and the size of the quantum dot light converting portion 730, and their angles can also be determined in various ways .

FIG. 12 is a view illustrating a configuration of a light source package having protrusions protruding from a reflective portion according to an exemplary embodiment of the present invention. Referring to FIG. A plurality of reflection protrusions 1210 are formed in the reflective portion 720c so that the light of the light source portion 710 is incident on the quantum dot light conversion portion 730. [ The position and shape of the reflective protrusion 1210 may be variously formed according to the positions and configurations of the light source unit 710 and the quantum dot light conversion unit 730. When the reflective protrusion 1210 is formed, the light from the light source 710 can be incident on the quantum dot light converting unit 730 at various angles and at various angles.

The reflectors discussed so far have various shapes such as the number of reflectors, whether the reflector is plane or curved. Hereinafter, another embodiment of the reflection portion will be described with reference to a view formed by an optical member such as a prism.

13 is a view illustrating a configuration of a light source package to which a prism-shaped reflector according to another embodiment of the present invention is coupled. The reflector 720d has a prism-type optical member having a reflective surface 721. The prism-type optical member 720 has a structure in which the light emitted from the light source unit 710 is incident on the quantum dot light conversion unit 730. The reflector 720d may have a reflectance of 90% or more in a section other than the light-incident section where the light source is incident and the light-emitting section where the light source is emitted.

FIG. 14 is a view showing a configuration of a light source package to which a transparent circular reflecting portion according to another embodiment of the present invention is combined. The reflective portion 720e has a structure in which a curved surface using a transparent material is used. The curved surface 722 has a spherical or aspherical surface. The curved portion has a reflectance of 90% or more.

As shown in FIG. 17, when the reflector is formed of a prism-like light-deflecting member that refracts and reflects light instead of a reflection plate as shown in FIGS. 13 and 14, it can be seen that the brightness increases as shown in FIG.

The light source package combined with the reflection unit and the quantum dot light conversion unit thus far emits white light by transmitting light of a specific wavelength band emitted from the light source, for example, blue light, through the quantum dot light conversion unit.

That is, the present invention provides a backlight unit structure of a liquid crystal display device comprising a light source unit and a light guide plate, wherein the light source unit is located at the lower end of the light guide plate, and the quantum dot light conversion unit And a reflector for reflecting the light emitted from the front surface of the light source portion to the quantum dot light conversion portion. When the light emitted from the light source unit (light emitting diode) is reflected by the reflection unit and is incident on the quantum dot light conversion unit, the quantum dot is excited to perform white conversion. When the present invention is applied, even if the quantity of the light source (LED) is reduced by 50%, hotspot does not occur, and a high-efficiency package (Flip Chip package)

15 is a view showing the temperature in the light source package according to the embodiment of the present invention. The same temperature point is connected, and the point 710 having the light source has the highest temperature and the temperature decreases as it goes to the outer part. In other words, the farther away from the light source the lower the temperature.

1510 is a case of measuring the temperature when the conventional QD rail system is used. The QD rail 610 is adjacent to the light source 710. The same temperature is indicated by a line, and the temperature decreases as the light source 710 goes outward. The temperature of the light source 710 at the highest point is 63.1 degrees and the temperature of the QD rail 610 is 54.1 degrees. 1510 shows that the QD rail 610 is included in a region where the temperature is the same as the light source 710 or the temperature difference is not large and the QD rail 610 is directly affected by the heat.

In the meantime, the temperature of the light source 710 is 63.5 degrees and the temperature of the quantum dot light converting unit 730 is 43.8 degrees. The temperature decreases as the light source 710 goes outward. Compared with the structure of FIG. 1510, the temperature is low at about 10 degrees, so that the quantum dot light converting unit 730 is prevented from deteriorating due to heat. This shows that the distance between the heat source of the light source unit 710 and the quantum dot light conversion unit 730 is increased to reduce the heat transferred from the heat source due to convection and radiation, thereby improving the reliability of the quantum dot light conversion unit 730.

The temperature of the light source unit 710 and the temperature of the quantum dot light conversion unit 730 are very different from each other in the region of the temperature. This shows that the heat of the light source part 710 is not transmitted to the quantum dot light converting part 730, so that the performance deterioration due to the heat of the quantum dot light converting part 730 does not occur.

When the present invention is applied, it is possible to simultaneously improve the reliability problem and the high cost problem due to the heat, which was a problem of the conventional color reproduction QD backlight unit. That is, the cost of the QD material can be reduced because the consumption of the QD material is drastically reduced as compared with the QD sheet technology in which the reliability problem due to heat, which is a problem of the conventional QD rail, is solved. In addition, the LED efficiency can be reduced by more than two times due to the light efficiency.

16 and 17 are diagrams showing the results of measurement of luminance according to each embodiment of the reflector of the present invention. And six light emitting diodes are used respectively.

In FIG. 16, reference numeral 1601 denotes the brightness of the screen when a conventional QD sheet is used, and the brightness is 4503. When six light emitting diodes are used, it can be seen that six hot spots are generated as shown at 1610. On the other hand, when the conventional QD sheet is used, it can be seen that the luminance is constant in a region such as 1611. [

In FIG. 16, reference numeral 1602 denotes the brightness of the screen when the reflector as shown in FIG. 8 is used, and the brightness is 4020. FIG. The luminance is about 89.2% as compared with the case where the conventional technique using the QD sheet is applied (1601 in Fig. 16). Hotspots at 1610 do not appear at 1620.

In FIG. 16, reference numeral 1603 denotes the brightness of the screen when the reflector as shown in FIG. 9 is used, and the brightness is 4031. FIG. As compared with the case where the conventional technique using the QD sheet is applied (1601 in Fig. 16), the luminance is about 89.5%. The hotspot at 1610 does not appear at 1630.

In Fig. 17, reference numeral 1701 denotes the brightness of the screen when the reflector as shown in Fig. 11 is used, and the brightness is 4012. Fig. As compared with the case where the conventional technique using the QD sheet is applied (1601 in Fig. 16), the luminance is about 89.0%. Hotspots at 1610 do not appear at 1710.

In FIG. 17, reference numeral 1702 denotes the brightness of the screen when the reflective portion as shown in FIG. 13 is used, and the brightness is 4105. FIG. The luminance is about 91.2% as compared with the case where the conventional technique using the QD sheet is applied (1601 in Fig. 16). Hotspots at 1610 do not appear at 1720.

In FIG. 17, reference numeral 1703 denotes the brightness of the screen when the reflective portion as shown in FIG. 14 is used, and the brightness is 4054. The luminance is about 90.0% as compared with the case where the conventional technique using the QD sheet is applied (1601 in Fig. 16). Hotspots at 1610 do not appear at 1730.

Fig. 18 is a diagram showing the result of measuring the screen brightness in the case of using the reflector as shown in Fig. 8. Fig. Fig. 18 shows the screen brightness when three light emitting diodes are cut in half. The luminance is 2041, and the luminance is about 45.3% as compared with the case where the conventional technique is applied (1601 in FIG. 16). Hotspots at 1610 do not appear at 1810.

As a result of comparing the luminance of each embodiment in FIGS. 16 to 18, it can be seen that the luminance is reduced by about 9 to 11%, but the hot spot phenomenon disappears, as compared with the case where the conventional technique is applied (1601 in FIG. 16). Also, since hot spots do not occur even when the number of light emitting diodes is reduced by 50% as shown in FIG. 18, the efficiency of the backlight unit can be increased when the number of light emitting diodes is reduced by using a high current.

The configuration of the present invention is summarized as follows. The light source unit constituting the backlight unit for a liquid crystal display device may be a light emitting diode as an example, and may be a short-wavelength light emitting diode in more detail. But the present invention is not limited thereto. The backlight unit may be configured to be positioned at the lower end of one side of the backlight unit and attached to the structure at the lower end. And the quantum dot light conversion section is located at the upper end of the same side of the backlight unit. A member for blocking heat may be formed between the quantum dot light conversion units of the light source unit. In addition, the quantum dot light conversion portion is protected by resin or glass to prevent contact with the atmosphere. The light source unit and the quantum dot light conversion unit are arranged side by side on the same side of the backlight unit, and the light from the light source unit is reflected through the reflection unit to enter the quantum dot light conversion unit. The quantum dot light conversion section excites the incident light to cause white conversion. The reflector includes an optical structure for reflecting the light of the light source into the quantum dot light conversion unit, and includes all materials that are optical members such as a reflector and a prism, and reflect light by changing the path of the light. In one embodiment, it comprises both optical materials in the form of a transparent column, such as a combination of two or more reflectors, a curved surface, or a prism that is transparent, such as a prism, and changes the optical path.

FIG. 19 is a diagram illustrating a configuration of a light source unit and a quantum dot light conversion unit according to another embodiment of the present invention.

In another embodiment of the present invention, the light source portion is located at the upper end of one side of the backlight unit, and the quantum dot light conversion portion can be positioned at the lower end of the same side. That is, the position of the light source unit 710 and the position of the quantum dot light conversion unit 730 may be changed up and down as shown in FIG. This means that various modifications are possible in light of the light guiding characteristics of the light guide plate 210, the height of the light guide plate 210, and the like.

Accordingly, all embodiments in which the light source unit and the quantum dot light conversion unit are disposed on the same side face of the backlight unit, but the reflection unit is coupled to prevent the heat of the light source unit from being transmitted to the quantum dot light conversion unit, corresponds to the embodiment of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

100: liquid crystal display device 120: backlight unit
200, 710: light source part 210: light guide plate
720: reflection part 730: quantum dot light conversion part
735: Quantum dot layer 739: Protective layer
750: Heat blocker

Claims (12)

A light source unit having a plurality of light sources;
A reflector for reflecting light of the light source of the light source unit; And
And a quantum dot light converting section for converting the light of the first wavelength band incident from the reflection section into light of one or more of the second wavelength band or the third wavelength band and emitting the light. The method according to claim 1,
The light of the first wavelength band is blue light,
Wherein the light of the second wavelength band is green light, and the light of the third wavelength band is red light. The method according to claim 1,
Wherein the light source unit and the quantum dot light conversion unit are arranged side by side opposite to the reflection unit,
And the end portion of the heat source is located between the light source portion and the quantum dot light conversion portion. The method according to claim 1,
The quantum dot light converting unit
A quantum dot layer in which the plurality of quantum dots are dispersedly located; And
And a protective layer located on the quantum dot and blocking the quantum dot from the air. The method according to claim 1,
Wherein the reflective portion comprises two or more planes. The method according to claim 1,
Wherein the reflective portion comprises a curved surface. The method according to claim 1,
Wherein the reflective portion is formed of a prismatic optical member. The method according to claim 1,
And the reflector includes a projection that reflects the incident light in two or more directions. A light source unit having a plurality of light sources;
A reflector for reflecting light of the light source of the light source unit;
A quantum dot light conversion unit for converting light of a first wavelength band incident from the reflection unit into light of at least one of a second wavelength band or a third wavelength band and emitting the light; And
And a light guide plate that emits white light emitted from the quantum dot light converting portion to a liquid crystal display panel. 10. The method of claim 9,
Wherein the light source unit and the quantum dot light conversion unit are formed on a side surface of the backlight unit, and the light source unit and the quantum dot light conversion unit are positioned so as to face the reflection unit. 10. The method of claim 9,
Wherein the reflector is a shape of a reflector composed of two or more planes or at least one curved surface. 10. The method of claim 9,
Wherein the reflective portion is formed of a prismatic optical member.

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