White light emitting device and display device using the same

Abstract

Disclosed are a white light emitting device and a display device using the same. The white light emitting device includes: a circuit board; a plurality of light sources mounted on the circuit board, each of the plurality of light sources configured to emit monochromatic light; a light converter spaced apart from the circuit board, the light converter configured to convert the monochromatic light emitted from the light sources into white light; and a compensator disposed between the circuit board and the light converter, the compensator configured to convert the emitted monochromatic light into white light.

Description

Technical Field

[0001] Example embodiments relate to a white light emitting device that emits white light using a light source that emits monochromatic light, and a display panel including the white light emitting device. Background Art

[0002] A light emitting device, such as a light emitting diode (LED), is an optical semiconductor device that emits light through the recombination of minority carriers (electrons or holes). The light generated by the recombination of minority carriers is monochromatic light with a wavelength within a specific range.

[0003] Methods of generating white light include using a plurality of light emitting devices that emit various monochromatic lights having complementary colors, and using one light emitting device and a phosphor having a complementary color to the monochromatic light emitted by the light emitting device.

[0004] When multiple light-emitting devices are used to synthesize white light, the color reproduction range can be widened. However, because the electrical characteristics of each light-emitting device may differ from each other, the driving circuit becomes complicated, and because the characteristics of the light-emitting devices vary depending on their use, color uniformity may not be guaranteed.

[0005] In addition, when a light emitting device and phosphor are used to synthesize white light, the driving circuit can be simplified. However, due to the reflection, refraction, etc. of monochromatic light, color uniformity cannot be guaranteed. Summary of the Invention

[0006] Accordingly, an aspect of the exemplary embodiments provides a white light emitting device having improved color uniformity, and a display panel using the same.

[0007] Additional aspects of the exemplary embodiments will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the exemplary embodiments.

[0008] According to one aspect of an exemplary embodiment, a white light emitting device includes: a circuit board; a plurality of light sources mounted on the circuit board, each of the plurality of light sources being configured to emit monochromatic light; a light converter spaced apart from the circuit board, the light converter being configured to convert the monochromatic light emitted from the light source into white light; and a compensator disposed between the circuit board and the light converter, the compensator being configured to convert the emitted monochromatic light into white light.

[0009] The compensator may include a plurality of phosphor members formed of phosphors having colors complementary to the color of the emitted monochromatic light.

[0010] A plurality of phosphor members may be disposed between the plurality of light sources.

[0011] At least one of the plurality of phosphor members may be disposed inside at least one of the plurality of light sources.

[0012] The at least one light source may include: a light emitting device kit configured to generate monochromatic light; and a lens configured to accommodate the light emitting device kit and emit the monochromatic light, and the at least one phosphor member may be disposed between the light emitting device kit and the lens and convert the monochromatic light reflected inside the at least one light source into white light.

[0013] An arrangement pattern of the plurality of phosphor members may be determined according to a pattern of color mura of white light emitted from the light converter.

[0014] The plurality of phosphor members may include a first group of phosphor members disposed on an edge of the circuit board and a second group of phosphor members disposed at a center of the circuit board, and the first group may be more densely arranged than the second group.

[0015] The size of the phosphor member may be determined according to the degree of color mura of the white light converted from the light converter.

[0016] The plurality of phosphor members may include a first phosphor member having a first size and located on an edge of the circuit board and a second phosphor member having a second size and located on a center of the circuit board, and the first size may be greater than the second size.

[0017] The white light emitting device may include a coating layer stacked on a compensator.

[0018] The white light emitting device may include a reflector including a plurality of openings corresponding to the plurality of light sources, the reflector being stacked on the circuit board and reflecting monochromatic light toward the light converter.

[0019] According to another aspect of the exemplary embodiment, a white light emitting device includes: a circuit board; a plurality of light sources mounted on the circuit board, each of the plurality of light sources being configured to emit blue light; a light converter spaced apart from the circuit board, the light converter being configured to convert the blue light emitted from the light source into white light; a reflective sheet stacked on the circuit board, the reflective sheet being configured to reflect the blue light toward the light converter; and a compensator disposed between the circuit board and the reflective sheet, the compensator being configured to convert the blue light into white light.

[0020] The compensator may include a plurality of phosphor components having a yellow phosphor.

[0021] A plurality of phosphor members may be arranged between the plurality of light sources.

[0022] An arrangement pattern of the plurality of phosphor members may be determined according to a pattern of color mura of white light converted from the light converter.

[0023] The plurality of phosphor members may include a first group of phosphor members disposed on an edge of the circuit board and a second group of phosphor members disposed at a center of the circuit board, and the first group may be more densely arranged than the second group.

[0024] A plurality of phosphor members may be directly printed and formed on the reflective sheet.

[0025] At least one of the plurality of light sources may include a light emitting device kit configured to generate blue light; and a lens configured to emit the blue light generated from the light emitting device kit, with the plurality of phosphor members disposed between the lens and the light emitting device kit.

[0026] The compensator may be formed of at least one of a sheet or a film having a plurality of phosphor members, and the compensator may be bonded to the reflective sheet.

[0027] The compensator may be formed by depositing a plurality of phosphor elements on a reflective sheet.

[0028] The compensator may be formed by bonding a plurality of phosphor members to a reflective sheet.

[0029] According to another aspect of the exemplary embodiment, a display device includes: a liquid crystal panel; a light guide plate disposed behind the liquid crystal panel; and a white light emitting device disposed behind the light guide plate, the white light emitting device being configured to emit white light onto the light guide plate, wherein the white light emitting device includes: a circuit board; a plurality of light sources mounted on the circuit board, each of the plurality of light sources being configured to emit monochromatic light; a light converter spaced apart from the circuit board, the light converter being configured to convert monochromatic light incident from the light source into white light; and a compensator disposed between the circuit board and the light converter, the compensator being configured to convert the incident monochromatic light into white light.

[0030] According to another aspect of the exemplary embodiment, a white light emitting device includes: a circuit board; a light source mounted on the circuit board, the light source being configured to emit monochromatic light; a light converter being configured to convert the emitted monochromatic light into white light; and a compensator being arranged between the circuit board and the light converter, wherein a portion of the emitted monochromatic light is reflected by at least one of the light converter or the circuit board, and the compensator can be configured to convert the reflected monochromatic light into white light.

[0031] The compensator may include a plurality of phosphor members formed of phosphors having a color complementary to the color of the reflected monochromatic light.

[0032] A plurality of phosphor members may be disposed on the circuit board adjacent to the light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] These and / or other aspects of the exemplary embodiments will become more apparent and easier to understand from the following description taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is a schematic exploded perspective view of a white light emitting device according to an exemplary embodiment;

[0035] Figure 2 is a cross-sectional view of a light source of a white light emitting device according to an exemplary embodiment;

[0036] Figure 3 is a diagram for describing an exemplary embodiment of a light emitting device that emits monochromatic light;

[0037] Figure 4 is a cross-sectional view of a white light emitting device according to an exemplary embodiment;

[0038] Figure 5 is a cross-sectional view of a white light emitting device according to another exemplary embodiment;

[0039] Figure 6 is a cross-sectional view of a white light emitting device according to yet another exemplary embodiment;

[0040] Figure 7 is a view for describing an arrangement pattern of a phosphor member according to an exemplary embodiment;

[0041] Figure 8 is a view for describing an arrangement pattern of a phosphor member according to another exemplary embodiment;

[0042] Figure 9 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment;

[0043] Figure 10 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment;

[0044] Figure 11 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment;

[0045] Figure 12 is a view for describing a pattern of color mura of a white light emitting device according to an exemplary embodiment;

[0046] Figure 13 is a view for describing an arrangement pattern of phosphor members on an edge of a white light emitting device according to an exemplary embodiment;

[0047] Figure 14 is a view for describing an arrangement pattern of a phosphor member on an edge of a white light emitting device according to another exemplary embodiment;

[0048] Figure 15 is a cross-sectional view for describing a change in arrangement position of a phosphor member of a white light emitting device according to an exemplary embodiment;

[0049] Figure 16 is a cross-sectional view for describing a change in arrangement position of a phosphor member of a white light emitting device according to another exemplary embodiment;

[0050] Figure 17 is a cross-sectional view for describing a change in arrangement position of a phosphor member of a white light emitting device according to still another exemplary embodiment;

[0051] Figure 18 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment;

[0052] Figure 19 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment;

[0053] Figure 20 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment;

[0054] Figure 21 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment;

[0055] Figure 22 is an exploded perspective view of a display device according to an exemplary embodiment;

[0056] Figure 23 is an exploded perspective view of a display device according to another exemplary embodiment;

[0057] Figure 24 is a schematic exploded perspective view of a white light emitting device including a plurality of light source modules;

[0058] Figure 25 is a schematic perspective view for describing a light source module;

[0059] Figure 26 is a cross-sectional view of a white light emitting device;

[0060] Figure 27 is a cross-sectional view of a white light emitting device further comprising a coating layer;

[0061] Figure 28 is an exploded perspective view of a white light emitting device further comprising a reflector; and

[0062] Figure 29 is a cross-sectional view of a white light emitting device further comprising a reflector. DETAILED DESCRIPTION

[0063] The advantages and features of the exemplary embodiments and methods for implementing the exemplary embodiments will be clearly understood with reference to the accompanying drawings and the following detailed description. However, the description is not limited to the disclosed exemplary embodiments, but rather may be implemented in a variety of different forms. The exemplary embodiments are not intended to alter the scope as defined by the appended claims. Hereinafter, the exemplary embodiments will be described in detail with reference to the accompanying drawings.

[0064] Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals generally refer to like elements throughout.

[0065] Figure 1 is a schematic exploded perspective view of a white light emitting device according to an exemplary embodiment.

[0066] Reference Figure 1 A white light emitting device 100 according to an exemplary embodiment may include a circuit board 110, a plurality of light sources 120 mounted on the circuit board 110 and emitting various monochromatic lights (ML), a light converter 130 that converts the monochromatic lights into white light, and a compensator 140 that is disposed between the plurality of light sources 120 and reduces color mura.

[0067] Monochromatic light with a wavelength within a specific range appears visually as one color. For example, monochromatic light may have one of the colors blue, red, and green.

[0068] A plurality of light sources 120 are mounted on a circuit board 110. An electrode pattern or a circuit pattern may be formed on the circuit board 110, and the light sources 120 and the circuit board 110 may be electrically connected by wire bonding or flip-chip bonding. The circuit board 110 may be implemented as a printed circuit board 110, but the circuit board 110 may also be implemented as a flexible circuit board 110 (flexible copper-clad laminate) as needed.

[0069] Figure 2 is a cross-sectional view of the light source 120 of the white light emitting device 100 according to an exemplary embodiment. Figure 3 is a diagram for describing one exemplary embodiment of a light emitting device 121 a that emits monochromatic light.

[0070] like Figure 2 As shown in FIG, the light source 120 may be provided as a kit type and mounted on the circuit board 110. The light source 120 generates and emits monochromatic light. Specifically, the light source 120 includes a light emitting device kit 121 that generates monochromatic light and a lens 122 that emits monochromatic light.

[0071] The light emitting device kit 121 includes a light emitting device 121a that emits monochromatic light and a body 121b in which the light emitting device 121a is housed. The light emitting device 121a may be a light emitting diode (LED). Figure 3 An exemplary embodiment of the light emitting device 121 a is described.

[0072] like Figure 3 As shown in , the light emitting device 121 a may have a structure in which a substrate 1211 , an N-type semiconductor layer 1212 , an active layer 1213 , and a P-type semiconductor layer 1214 are sequentially stacked.

[0073] The substrate 1211 may be formed of a transparent material such as sapphire, and may also be formed of zinc oxide (ZnO), gallium nitride (GaN), silicon carbide (SiC), and aluminum nitride (AlN) other than sapphire.

[0074] In some exemplary embodiments, a buffer layer may be formed between the substrate 1211 and the N-type semiconductor layer 1212. The buffer layer serves to improve lattice matching before the N-type semiconductor layer 1212 is grown on the substrate 1211 and may be omitted according to process conditions and device characteristics.

[0075] The N-type semiconductor layer 1212 may be formed of a semiconductor material having a composition formula of InXAlYGa(1-XY)N (where 0≤X, 0≤Y, and X+Y≤1). More specifically, the N-type semiconductor layer 1212 may be formed of a GaN layer or a GaN / AlGaN layer doped with N-type conductive impurities, and, for example, silicon (Si), germanium (Ge), tin (Sn), or the like may be used as the N-type conductive impurities.

[0076] N-type semiconductor layer 1212 can be divided into a first layer 1212a and a second layer 1212b. First layer 1212a can define a light-emitting surface and is formed to have a larger area than second layer 1212b, thereby improving the optical characteristics of light-emitting device 121a. On second layer 1212b, active layer 1213 and P-type semiconductor layer 1214 can be sequentially stacked to form a light-emitting structure.

[0077] The active layer 1213 may be formed of an InGaN / GaN layer having a multi-quantum well structure.

[0078] The P-type semiconductor layer 1214 may be formed of a semiconductor material having a composition formula of InXAlYGa(1-XY)N (where 0≤X, 0≤Y, and X+Y≤1). More specifically, the P-type semiconductor layer 1214 may be formed of a GaN layer or a GaN / AlGaN layer doped with P-type conductive impurities, and for example, magnesium (Mg), zinc (Zn), beryllium (Be), etc. may be used as the P-type conductive impurities.

[0079] An N-type electrode 1215 is formed on the N-type semiconductor layer 1212 , and a P-type electrode 1216 is formed on the P-type semiconductor layer 1214 .

[0080] The adhesive layer 1217 may have a structure in which metal layers each formed of a single element are stacked in multiple layers, and the adhesive layer 1217 may include a reflective material to prevent the reflectivity of the lead frame 1218 from affecting the characteristics of the light emitting device 121a. For example, the adhesive layer 1217 may be formed of a metal including tin (Sn) or silver (Ag).

[0081] A lead frame 1218 is formed on the bottom of the body 121b to provide power to the light emitting device 121a. In addition, the lead frame 1218 may include or be coated with a reflective material that can reflect light generated by the light emitting device 121a.

[0082] The lead frame 1218 includes a first lead frame 1218a and a second lead frame 1218b spaced a certain distance apart, and the first lead frame 1218a is electrically connected to the N-type electrode 1215 , and the second lead frame 1218b is electrically connected to the P-type electrode 1216 .

[0083] When power is applied to the light emitting device kit 121 , electrons and holes flow from the N-type semiconductor layer 1212 and the P-type semiconductor layer 1214 into the active layer 1213 , and monochromatic light is generated by recombination of the electrons and holes flowing into the active layer 1213 .

[0084] The color of the monochromatic light generated by the light emitting device assembly 121 can be determined by the composition of the semiconductor as described above. For example, when a GaN-based semiconductor is used, the light emitting device 121a generates blue light.

[0085] at the same time, Figure 3 This is a simplified diagram for describing an exemplary embodiment of the light emitting device 121a, but the structure of the light emitting device 121a is not limited thereto. For example, in some exemplary embodiments, the light emitting device 121a may have a structure in which a P-type semiconductor layer 1214 is provided at an upper portion of the structure and an N-type semiconductor layer 1212 is provided at a lower portion of the structure.

[0086] Refer again Figure 2The body 121b accommodates the light emitting device 121a. The body 121b may be formed of at least one of a resin-based material (e.g., polyphthalamide (PPA)), silicon (Si), aluminum (Al), aluminum nitride (AlN), liquid crystal polymer (PSG, photosensitive glass), polyamide 9T (PA9T), syndiotactic polystyrene (SPS), a metal material, sapphire (Al2O3), beryllium oxide (BeO), and a printed circuit board (PCB) 110, but the body 121b is not limited thereto.

[0087] The body 121b may be formed by an injection molding process, an etching process, etc., but is not limited thereto. For example, the body 121b may be formed integrally with the circuit board 110 by an injection molding process.

[0088] In addition, the body 121b includes a cavity 123 that accommodates the light emitting device 121a as described above. The width and height of the cavity 123 may be greater than those of the light emitting device 121a, but are not limited thereto.

[0089] The cavity 123 may be formed in a shape in which the width of the cavity 123 decreases in the downward direction. That is, the sidewall 124 of the cavity 123 may be formed to be inclined. Here, the reflection angle of the monochromatic light emitted by the light emitting device 121a changes depending on the angle of the sidewall 124. Therefore, the inclination of the sidewall 124 can be adjusted to adjust the beam angle of the monochromatic light.

[0090] Specifically, when the inclination of the side wall 124 decreases, the beam angle of light decreases, and the convergence of light emitted from the light emitting device 121a to the outside increases. Conversely, when the inclination of the side wall 124 increases, the beam angle of light increases, and the convergence of light emitted from the light emitting device 121a to the outside decreases.

[0091] In addition, a reflective material that reflects light generated by the light emitting device 121 a may be coated on the sidewall 124 , and the utilization rate of the light generated by the light emitting device 121 a may be increased.

[0092] In some exemplary embodiments, the cavity 123 is molded by a material having excellent or otherwise desired watertightness, corrosion resistance, and electrical insulation, and may encapsulate the light emitting device 121a mounted inside the cavity 123. For example, the cavity 123 may be molded by epoxy resin, silicone resin, or the like, and the molding process may be performed by an ultraviolet method or a thermal curing method.

[0093] The lens 122 is provided outside the light emitting device package 121 and guides the monochromatic light generated by the light emitting device package 121. The lens 122 emits the monochromatic light generated by the light emitting device package 121 in the direction of the light converter 130.

[0094] The lens 122 may have a wide beam angle of light. Monochromatic light emitted by the light emitting device assembly 121 may be widened by the lens 122. Therefore, when the beam angle of light is widened, the thickness of the white light emitting device 100 may be reduced because the light source 120 and the light converter 130 may be disposed adjacently.

[0095] Furthermore, when the beam angle of light is widened, since monochromatic light emitted by the plurality of light emitting device packages 121 is uniformly incident to the light converter 130 , the brightness uniformity of the white light emitting device 100 may be increased.

[0096] like Figures 1 to 3 As shown in FIG, the lens 122 may be formed in a hemispherical shape, but the shape of the lens 122 is not limited thereto.

[0097] For example, the shape of the lens 122 may be one selected from a square column (eg, a regular hexahedron) with a concave center, a cylinder, an elliptical shape, and a batwing shape. However, a hemispherical shape may have excellent or desired incident efficiency into the light conversion layer.

[0098] At the same time, although Figure 1 , the light sources 120 are arranged in a rectangular shape, but the arrangement of the light sources 120 is not limited thereto. That is, the plurality of light sources 120 may be arranged in various shapes to reduce deviations in brightness and color and improve output uniformity of white light. For example, the light sources 120 may be arranged in a hexagonal shape.

[0099] Figure 4 is a cross-sectional view of a white light emitting device 100 according to an exemplary embodiment.

[0100] Reference Figure 1 and Figure 4 The light converter 130 converts the incident monochromatic light into white light and guides the white light in front of it. To this end, the light converter 130 may include a phosphor that converts the wavelength of the incident monochromatic light into monochromatic light of different colors to be transmitted.

[0101] For example, although the phosphor may include at least one of various luminescent materials including yttrium aluminum garnet (YAG)-based materials, terbium aluminum garnet (TAG)-based materials, silicate-based materials, sulfide-based materials, nitride-based materials, borate-based materials, and phosphate-based materials, the luminescent materials configuring the phosphor are not limited thereto.

[0102] The luminescent material configuring the phosphor may be determined according to the monochromatic light incident from the light source 120. That is, the light converter 130 may include a phosphor emitting light having a complementary color to the monochromatic light emitted from the light source 120.

[0103] For example, when light source 120 emits blue light, light converter 130 may include a yellow-light-emitting phosphor having a complementary color to blue. The yellow-light-emitting phosphor includes a YAG-based luminescent material, absorbs incident blue light, and emits yellow light. The blue light, which is not associated with the light emission of the yellow-light-emitting phosphor, and the yellow light emitted by the yellow-light-emitting phosphor mix to produce white light.

[0104] In some exemplary embodiments, when the light source 120 emits red light, the light converter 130 may include a cyan light-emitting phosphor having a complementary color of red, and when the light source 120 emits green light, the light converter 130 may include a magenta light-emitting phosphor having a complementary color of green.

[0105] Meanwhile, the light converter 130 can convert monochromatic light into white light using a plurality of phosphors. As described above, the light converter 130 converts monochromatic light into white light based on the principle of light mixing. For example, white light can also be generated by mixing blue light, red light, and green light.

[0106] Therefore, the light converter 130 may include a plurality of phosphors emitting different colors from each other. That is, the light converter 130 may generate complementary color light having a complementary color to the monochromatic light emitted by the light source 120 using the plurality of phosphors.

[0107] For example, when the monochromatic light emitted by the light source 120 is blue, the light converter 130 may include a green emitting phosphor and a red emitting phosphor. The red emitting phosphor absorbs incident blue light and emits red light, and the green emitting phosphor absorbs blue light and emits green light.

[0108] Therefore, blue light not associated with light emission of the phosphor, green light emitted by the green light emitting phosphor, and red light emitted by the red light emitting phosphor may be mixed to become white light.Here, the green light emitting phosphor and the red light emitting phosphor may be formed on different layers.

[0109] The green light emitting phosphor may include at least one selected from the group of a nitride-based phosphor, a sulfide-based phosphor, a silicate-based phosphor, and a quantum dot-based phosphor.

[0110] The red light emitting phosphor may include at least one selected from the group of a nitride-based phosphor, a sulfide-based phosphor, a fluoride-based phosphor, and a quantum dot-based phosphor.

[0111] The compensator 140 improves the color uniformity of the white light emitting device 100. Color mura is generated in the white light emitting device 100 due to refraction, reflection, and diffraction of the monochromatic light generated from the white light emitting device 100. Color mura can be, for example, unevenness or non-uniformity of the white light generated by the white light emitting device 100. The compensator 140 is located between the circuit board 110 and the light converter 130 and can convert the refracted, reflected, and diffracted monochromatic light into white light to compensate for the color mura.

[0112] Specifically, if Figure 4 As shown in FIG, monochromatic light generated by the light emitting device kit 121 is emitted onto the light converter 130 through the lens 122. However, a portion of the monochromatic light generated by the light emitting device kit 121 may be scattered, reflected, diffracted, and recycled in the white light emitting device 100 and incident on the light converter 130. For example, the monochromatic light refracted by the lens 122 is reflected by the substrate and incident on the light converter 130.

[0113] Color mura is generated in the white light emitting device 100 due to the difference between the incident paths of monochromatic light. Specifically, a relatively large amount of blue light is incident on a portion P1 of the light converter 130 adjacent to the light source 120, and bluish white light WL is emitted therefrom. However, a relatively large amount of blue light having a different path is incident on a portion P2 of the light converter 130 between the light source 120 and another light source 120, and yellowish white light WL is emitted therefrom.

[0114] Therefore, the compensator 140 converts a portion of light incident to the light converter 130 through different optical paths into white light to reduce color mura. The compensator 140 may include at least one phosphor member 141 that converts incident monochromatic light into white light.

[0115] The phosphor member 141 may include a phosphor that converts the wavelength of incident monochromatic light to emit monochromatic light of different colors. The phosphor included in the phosphor member 141 may include the above-mentioned various kinds of phosphors and may convert the incident monochromatic light into light of different wavelengths to emit light.

[0116] Here, the luminescent material configuring the phosphor may be determined according to the incident monochromatic light ML from the light source 120. That is, the phosphor member 141 may include a phosphor emitting a complementary color of the monochromatic light ML emitted by the light source 120.

[0117] Since the same monochromatic light ML is incident to the compensator 140 and the light converter 130 , the phosphor of the phosphor member 141 and the phosphor of the light converter 130 may be the same, but is not limited thereto.

[0118] For example, because the phosphor member 141 may include a yellow light emitting phosphor, incident blue light is converted into white light, and because the light converter 130 may include a red light emitting phosphor and a green light emitting phosphor, incident blue light is converted into white light.

[0119] In contrast, because the light converter 130 may include a yellow light emitting phosphor, incident blue light is converted into white light, and because the phosphor member 141 may include a red light emitting phosphor and a green light emitting phosphor, all incident blue light is converted into white light.

[0120] Therefore, the compensator 140 may convert a portion of the monochromatic light ML that is scattered or reflected and incident to the light converter 130 into white light to improve the color uniformity of the white light emitting device 100 .

[0121] Although Figure 4 As shown in , the configuration of the compensator 140 is not limited, but in some exemplary embodiments, the compensator 140 may be disposed adjacent to the circuit board 110 and convert the monochromatic light ML reflected by the circuit board 110 into white light.

[0122] Here, as Figure 1 As shown in FIG, the compensator 140 may be provided in the shape of a compensation sheet or film including a phosphor member 141 and formed by bonding the compensation sheet or film to the circuit board 110. However, the method of forming the compensator 140 is not limited thereto.

[0123] In another exemplary embodiment, Figure 23 As shown in , the compensator 140 may be directly formed on the circuit board 110. Specifically, the compensator 140 may be formed by coating the phosphor member 141 on the circuit board 110 in a regular pattern, or by depositing the phosphor member 141 on the circuit board 110 in a regular pattern.

[0124] Furthermore, the compensator 140 may also be formed by directly printing the phosphor member 141 on the circuit board 110. Specifically, the compensator 140 may be formed by mixing the phosphor with an adhesive configured to fix the phosphor to the circuit board 110 to form a phosphor ink, and then directly printing the formed phosphor ink on the circuit board 110 to form the phosphor member 141. Here, the phosphor member 141 may also be formed in a regular pattern. The pattern of the phosphor member 141 will be described in detail below.

[0125] Figure 5 is a cross-sectional view of a white light emitting device 100 according to another exemplary embodiment.

[0126] Reference Figure 5The white light emitting device 100 may further include a reflector 150. The reflector 150 may be stacked on the circuit board 110. The reflector 150 may reflect the monochromatic light emitted by the light source 120 toward the light converter 130 to increase the utilization efficiency of the monochromatic light.

[0127] The reflector 150 can be formed of a reflective member having good elasticity and excellent light reflectivity and easily formed into a thin film. For example, the reflector 150 can be formed of a reflective material such as white polyethylene terephthalate (PET), white polycarbonate (PC), etc.

[0128] Although the reflector 150 may be provided in the shape of a reflective sheet or a reflective film and coupled to the circuit board 110 by being bonded to the circuit board 110 on which the compensator 140 is provided, a method of forming the reflector 150 is not limited thereto.

[0129] For example, the reflector 150 may be formed by depositing a reflective member on the circuit board 110 on which the compensator 140 is disposed, or by mixing the reflective member with an adhesive, printing, or coating the reflective member mixed with the adhesive on the circuit board 110 on which the compensator 140 is disposed.

[0130] Figure 6 is a cross-sectional view of a white light emitting device 100 according to still another exemplary embodiment.

[0131] Reference Figure 6 According to yet another exemplary embodiment, a white light emitting device 100 may include a circuit board 110, a plurality of light sources 120 mounted on the circuit board 110 and each of which emits monochromatic light, a light converter 130 that converts the monochromatic light ML into white light, a reflective sheet disposed on the circuit board 110, and a compensator 140 disposed on the reflective sheet.

[0132] Although Figure 5 The compensator 140 is arranged below the reflector 150, but as Figure 6 As shown in FIG, the circuit board 110, the reflector 150, and the compensator 140 can be stacked in sequence. In other exemplary embodiments, the circuit board 110, the reflector 150, and the compensator 140 can be stacked in any desired order. When the stacking order of the white light emitting device 100 is changed, the method of manufacturing the white light emitting device 100 may also be changed.

[0133] As described above, the reflector 150 is provided in the shape of a reflective sheet or a reflective film, and the compensator 140 is provided in the shape of a compensation sheet or a compensation film, and the sheets or films may be sequentially stacked to form the lower portion of the white light emitting device 100. However, the method of forming the lower portion of the white light emitting device 100 is not limited thereto.

[0134] As another exemplary embodiment, the compensator 140 is formed on a reflective sheet or film, and the reflective sheet or film may be coupled to the circuit board 110 to form a lower portion of the white light emitting device 100 .

[0135] Specifically, the compensator 140 may be formed by coating the phosphor member 141 on a reflective sheet or film in a regular pattern, or by depositing the phosphor member 141 on a reflective sheet or film in a regular pattern.

[0136] Furthermore, the compensator 140 may be formed by directly printing the phosphor member 141 onto a reflective sheet or film. The compensator 140 may be formed by mixing a phosphor with an adhesive configured to fix the phosphor to the reflective sheet or film to form a phosphor ink, and then directly printing the formed phosphor ink onto the reflective sheet or film to form the phosphor member 141. Here, the phosphor member 141 may be formed in a regular pattern.

[0137] Hereinafter, the shape of the phosphor member 141 and the arrangement pattern of the phosphor member 141 may be described in detail.

[0138] Figure 7 is a view of one exemplary embodiment for describing an arrangement pattern of a phosphor member according to one exemplary embodiment. Figure 8 is a view for describing an arrangement pattern of a phosphor member according to another exemplary embodiment. Figure 9 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment. Figure 10 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment.

[0139] Reference Figures 7 to 10 , the phosphor member 141 may be formed in various shapes. For example, the phosphor member 141 may be configured as follows Figure 7 The rectangular shape shown in Figure 8 In addition, the phosphor member 141 may be configured as follows: Figure 9 The circular shape shown in Figure 10 That is, the phosphor member 141 may be formed in a suitable shape to reduce color mura.

[0140] In addition, the phosphor members 141 may be arranged in a regular pattern. The arrangement pattern of the phosphor members 141 may differ according to the pattern of color mura.

[0141] That is, the phosphor members 141 may be arranged in a pattern according to color mura. Here, the pattern of color mura may differ according to the arrangement of the light source 120, the shape of the lens 122, and the type of the light emitting device kit 121.

[0142] Furthermore, the area of ​​the phosphor member 141 per unit light source can be determined based on the degree of color mura. If the area of ​​the phosphor member 141 is too large, color mura is overcompensated and color uniformity is degraded. If the area of ​​the phosphor member 141 is too small, color mura is insufficiently compensated and color uniformity is degraded. Therefore, the area of ​​the phosphor member 141 can be determined based on the degree of color mura.

[0143] Specifically, the area of ​​the phosphor member 141 per unit light source may be determined according to the size of the phosphor member 141 and the number of phosphor members 141. That is, when n phosphor members 141 having a size A are provided for each light source 120, the area of ​​the phosphor member 141 per light source is A×n.

[0144] Therefore, the size A of the phosphor member 141 may be adjusted according to the degree of color mura, or the number of phosphor members 141 disposed around the light source may be adjusted to determine the degree of compensation of color mura.

[0145] As one exemplary embodiment of an arrangement pattern of the phosphor members 141, the phosphor members 141 may be arranged in a regular pattern included in a space between a light source 120 and another light source 120. Specifically, as shown in FIG. Figures 7 to 10 As shown in , a plurality of phosphor members 141 may be disposed at a predetermined distance (D) from the light source 120 , and each phosphor member 141 may be arranged to have a pitch having a predetermined angle (θ) around the light source 120 .

[0146] Here, the distance between the light source 120 and the phosphor member 141 may be determined according to the distance between the plurality of light sources 120. For example, the distance between the light source 120 and the phosphor member 141 may be determined in proportion to the distance between the light sources 120.

[0147] At the same time, although Figures 7 to 10 The plurality of phosphor members 141 are arranged in a circular shape, but the arrangement of the phosphor members 141 may differ according to the shape of the light source 120, particularly according to the shape of the lens 122. For example, when the light source 120 includes the lens 122 having a rectangular shape, the phosphor members 141 may be arranged in a rectangular shape.

[0148] In addition, Figures 7 to 10In the embodiment of the present invention, although the phosphor members 141 are radially arranged around the light source 120, the arrangement pattern of the phosphor members 141 is not limited thereto.

[0149] Figure 11 is a view for describing an arrangement pattern of a phosphor member 141 according to still another exemplary embodiment. Figure 12 is a view for describing a pattern of color mura of the white light emitting device 100 according to one exemplary embodiment.

[0150] The arrangement pattern of the plurality of phosphor members 141 may be determined according to a generation pattern of color mura. Figure 1 As shown in FIG, when the light sources 120 are arranged in a dot matrix pattern, color mura can also be Figure 12 The dot pattern shown in is shown.

[0151] Therefore, the arrangement pattern of the phosphor members 141 may also be as follows Figure 11 Specifically, the plurality of phosphor members 141 are arranged at a predetermined distance and in a dot matrix pattern to form groups 1141 , 1142 , 1143 , and 1144 , and each of the groups 1141 , 1142 , 1143 , and 1144 may be arranged vertically and laterally around the light source 120 .

[0152] Here, the number of phosphor members 141 configuring each of the groups 1141 , 1142 , 1143 , and 1144 and the size of each phosphor member 141 may be determined according to the degree of color mura as described above.

[0153] At the same time, if Figure 12 As shown in , since color mura is relatively more generated at the edge of the white light emitting device 100 compared to the center of the white light emitting device 100 , the arrangement pattern of the phosphor members 141 on the edge of the white light emitting device 100 may be different from other portions.

[0154] As described above, since the correction of color mura is proportional to the area of ​​the phosphor member 141 per unit light source 120, the pattern of the phosphor member 141 can be adjusted so that the area of ​​the phosphor member per unit light source at the edge where color mura is severe becomes larger. This will be referred to below. Figures 13 and 14 Describe in more detail.

[0155] Figure 13 is a view for describing an arrangement pattern of phosphor members on an edge of a white light emitting device 100 according to an exemplary embodiment.

[0156] like Figure 13As shown in FIG, the phosphor member 141 a corresponding to the light source 120 a located on the edge of the white light emitting device 100 and the phosphor member 141 b corresponding to the light source 120 b located on the center of the white light emitting device 100 have different sizes.

[0157] That is, the size of the phosphor member 141a corresponding to the light source 120a located on the edge may be larger than the size of the phosphor member 141b corresponding to the light source 120b located on the center so that color mura is further compensated on the edge where color mura is relatively severely generated.

[0158] Meanwhile, since the area of ​​the phosphor member of each light source is affected by the number of phosphor members, the number of phosphor members 141a corresponding to the light source 120a located on the edge may be greater than the number of phosphor members 141b corresponding to the light source 120b located on the center.

[0159] Figure 14 is a view for describing an arrangement pattern of phosphor members on an edge of a white light emitting device 100 according to another exemplary embodiment.

[0160] Reference Figure 14 , the phosphor member 141 c corresponding to the light source 120 c located on the edge of the white light emitting device 100 and the phosphor member 141 d corresponding to the light source 120 d located on the center of the white light emitting device 100 may have different shapes.

[0161] The phosphor member 141d corresponding to the light source 120d located on the center of the white light emitting device 100 may be circular, and the phosphor member 141c corresponding to the light source 120c located on the edge may be polygonal, so that color mura is further compensated on the edge where color mura is relatively severely generated.

[0162] At the same time, although Figures 1 to 14 The middle phosphor member 141 is located between the light source 120 and the other light source 120, but the configuration of the phosphor member 141 is not limited thereto. Hereinafter, the arrangement position of the phosphor member 141 will be described.

[0163] Figure 15 is a cross-sectional view for describing a change in arrangement position of a phosphor member of a white light emitting device according to an exemplary embodiment. Figure 16 is a cross-sectional view for describing a change in arrangement position of a phosphor member of a white light emitting device according to another exemplary embodiment. Figure 17 is a cross-sectional view for describing a change in arrangement position of a phosphor member of a white light emitting device according to still another exemplary embodiment.

[0164] Reference Figures 15 to 17 The phosphor member 145 disposed inside the light source 120 may convert the monochromatic light refracted and reflected inside the light source 120 into white light. Here, the phosphor member 145 may be disposed between the light emitting device package 121 and the lens 122.

[0165] More specifically, if Figures 15 to 17 As shown in FIG, the phosphor member 145 may be disposed in a space where the lens 122 and the light emitting device package 121 are not positioned. Here, the phosphor members 145 disposed inside the light source 120 may be arranged in a regular pattern.

[0166] Figure 18 is a plan view of a light source for describing an arrangement pattern of phosphor members according to still another exemplary embodiment. Figure 19 is a plan view of a light source for describing an arrangement pattern of phosphor members according to still another exemplary embodiment. Figure 20 is a plan view of a light source for describing an arrangement pattern of phosphor members according to still another exemplary embodiment.

[0167] Reference Figure 2 as well as Figures 18 to 20 , the light emitting device assembly 121 is disposed inside the lens 122. The lens 122 can be fixed to the circuit board 110 by a support member 127 disposed at an angle of 120 degrees.

[0168] The phosphor member 145 is disposed in the space between the lens 122 and the light emitting device package 121. Figures 18 to 20 As shown in FIG, the phosphor member 145 may be disposed in a space between the supports 127.

[0169] As described above, since compensation of color mura is proportional to the area of ​​the phosphor member 145 per unit light source 120 , the area of ​​the phosphor member 145 existing inside the light source 120 and the number of phosphor members 145 may differ according to compensation of color mura.

[0170] Figure 21 is a view for describing an arrangement pattern of a phosphor member according to still another exemplary embodiment.

[0171] like Figure 21 As shown in , the compensator may include a first phosphor member 141 disposed between the light source 120 and another light source and a second phosphor member 145 existing inside the light source 120 .

[0172] The shapes and sizes of the first and second phosphor components 141 and 145 can be determined based on the degree of color mura as described above. Here, the first and second phosphor components 141 and 145 can have different shapes. For example, the first phosphor component 141 can be circular, and the second phosphor component 145 can be fan-shaped with its interior cut out. Furthermore, the first and second phosphor components 141 and 145 can have different sizes.

[0173] In addition, the first phosphor member 141 and the second phosphor member 145 may have different arrangement patterns. For example, the first phosphor member 141 may be arranged at an angle of 30 degrees and in a circular shape, and the second phosphor member 145 may be arranged at an angle of 120 degrees.

[0174] Figure 22 is an exploded perspective view of a display device according to an exemplary embodiment. Figure 23 is an exploded perspective view of a display device according to another exemplary embodiment.

[0175] Reference Figure 22 and Figure 23 , a display device 200 according to one exemplary embodiment includes a frame 210 , a liquid crystal panel 220 , an optical portion 235 , a diffusion plate 240 , and a white light emitting device 100 .

[0176] The frame 210 accommodates the liquid crystal panel 220, the optical part 235, and the white light emitting device 100. The frame 210 may have a square frame shape and may be formed of plastic or reinforced plastic.

[0177] A bottom plate surrounding the frame 210 and supporting the backlight assembly may be disposed under the frame 210 or on a side of the frame 210 to improve durability and fire resistance of the frame 210 .

[0178] The liquid crystal panel 220 can adjust the arrangement of the liquid crystal layer that refracts white light incident from the white light emitting unit in different patterns to produce an image to be displayed to the user. To this end, the liquid crystal panel 220 can further include a thin film transistor substrate 221 and a color display substrate 222, wherein the liquid crystal layer is disposed between the thin film transistor substrate 221 and the color display substrate 222.

[0179] The thin film transistor substrate 221 and the color display substrate 222 may be spaced apart from each other by a specific distance. A color filter and a black pad may be provided on the color display substrate 222. A driver 223 configured to transmit a driving signal to the thin film transistor substrate 221 may be mounted on the thin film transistor substrate 221. The driver 223 may include a first substrate 224, a driver chip 225 connected to the first substrate 224, and a second substrate 226 on which the driver chip 225 is mounted. The second substrate 226 according to the exemplary embodiment may be a printed circuit board or a flexible printed circuit board (FPCB) 110.

[0180] In addition to the liquid crystal panel 220 described above, various panels conceivable by those skilled in the art may be an exemplary embodiment of the liquid crystal panel 220 .

[0181] As desired, in the liquid crystal panel 220 , a touch panel including a polyester film, glass, etc. may be installed to sense a touch operation, or a polarization film may be further installed to polarize light transmitted to the outside through the liquid crystal panel 220 .

[0182] The optical portion 235 is disposed between the liquid crystal panel 220 and the white light emitting device 100. The optical portion 235 diffuses and collects the white light guided by the diffusion plate 240 and transmits the white light to the liquid crystal panel 220.

[0183] The optical part 235 may include a diffusion sheet 233 and prism sheets 231 and 232. The diffusion sheet 233 diffuses light emitted by the diffusion plate 240, and the prism sheets 231 and 232 collect the light diffused by the diffusion sheet 233 to supply uniform light to the liquid crystal panel 220.

[0184] The diffusion sheet 233 diffuses and outputs the incident light. Further uniform white light can be provided to the liquid crystal panel 220 by the diffusion sheet 233. The diffusion sheet 233 can be omitted or configured to have a plurality of sheets as desired.

[0185] The prism sheets 231 and 232 may include a first prism sheet 231 and a second prism sheet 232 in which prisms intersect perpendicularly in the x-axis direction and the y-axis direction. When the prism sheets 231 and 232 refract light from the x-axis direction and the y-axis direction, the linearity of the light may be improved.

[0186] The diffusion plate 240 diffuses and outputs the white light emitted by the white light emitting device 100. That is, the white light emitted by the white light emitting device 100 is further diffused while passing through the diffusion plate 240. Therefore, the white light can be diffused to further improve brightness uniformity.

[0187] Specifically, the diffusion plate 240 may be provided in a plate shape. For example, the diffusion plate 240 may be implemented by a translucent acrylic plate having a thickness of 1 to 2.5 mm and serves to uniformly diffuse the white light emitted by the white light emitting device 100 .

[0188] The white light emitting device 100 as described above may be applied to the display device 200. The white light emitting device 100 may provide backlight to the liquid crystal panel 220 as described above.

[0189] Specifically, as described above, the white light emitting device 100 may include a circuit board 110, a plurality of light sources 120 each emitting monochromatic light ML and mounted on the circuit board 110, a light converter 130 that converts the monochromatic light into white light, and a compensator 140 disposed between the plurality of light sources 120 to reduce color mura.

[0190] The light source 120 may be provided as a kit type, and a plurality of light sources 120 may be mounted on the circuit board 110. Figure 22 and Figure 23 , although the light sources 120 are arranged in a dot matrix pattern, the arrangement pattern of the light sources may be changed in various shapes as desired.

[0191] Here, the light source 120 generates and emits monochromatic light. For example, the light source 120 may emit blue light generated by a blue LED. Here, the blue light generated by the blue LED may be passed through the lens ( Figure 2 122) is transmitted with a wide beam angle.

[0192] The monochromatic light emitted by the light source 120 is converted into white light when passing through the light converter 130. To this end, the light converter 130 may include a phosphor. For example, the light converter 130 may include a yellow light-emitting phosphor having a complementary color to blue light. In addition, the light converter 130 may include a red light-emitting phosphor and a green light-emitting phosphor instead of the yellow light-emitting phosphor to generate white light.

[0193] The white light transmitted by the light converter 130 reaches the liquid crystal panel 220 through the diffusion plate 240 and the optical portion 235. Therefore, the liquid crystal panel 220 uses the white light provided by the white light emitting device 100 as a backlight to display a predetermined image.

[0194] Here, refraction, reflection, and diffraction of light may occur inside the display device 200 and the white light emitting device 100. Therefore, color mura may be generated in the white light emitted by the white light emitting device 100 according to the change in the light path.

[0195] Therefore, the compensator 140 may be located between the circuit board 110 and the light converter 130 and convert the refracted, reflected, and diffracted monochromatic light into white light to compensate for color mura.

[0196] As described above, the compensator 140 may include the phosphor members 141 that may be arranged in patterns of various shapes. The phosphor members 141 may include phosphors. The phosphor members 141 convert a portion of monochromatic light incident to the compensator 140 to output white light.

[0197] The phosphor included in the phosphor member 141 may be the same as the phosphor of the light converter 130 as described above. For example, the phosphor member 141 may include a yellow light-emitting phosphor having a complementary color to blue light. In addition, the phosphor member 141 may include a red light-emitting phosphor and a green light-emitting phosphor instead of the yellow light-emitting phosphor to generate white light.

[0198] As described above, the phosphor member 141 may be disposed between the light sources 120 and 120, but may also be disposed inside the light sources 120. In addition, the phosphor member 141 may be disposed both inside the light sources 120 and between the light sources 120.

[0199] In addition, as described above, the arrangement pattern of the phosphor members 141 may differ according to the generation pattern of color mura.

[0200] Furthermore, since the degree of color mura may be more severe at the edge of the display portion than at the center of the display portion, the pattern of the phosphor member 141 at the edge of the display portion and the pattern of the phosphor member 141 at the center of the display portion may be different from each other.

[0201] In addition, the shape and size of each phosphor member 141 may be determined according to the degree of color mura, and the compensator 140 may include a plurality of phosphor members 141 having different shapes.

[0202] Here, as Figure 22 As shown in , the compensator 140 may be provided in a compensation sheet shape or a compensation film shape including a phosphor member 141 and formed by bonding the compensation sheet or the compensation film to the circuit board 110 .

[0203] In addition, if Figure 23 As shown in FIG, the compensator 140 according to another exemplary embodiment may be directly formed on the circuit board 110. Specifically, the compensator 140 may be formed by applying a phosphor member 141 to the circuit board 110 in a regular pattern, or by depositing the phosphor member 141 on the circuit board 110 in a regular pattern.

[0204] Furthermore, the compensator 140 may be formed by directly printing the phosphor member 141 on the circuit board 110. Specifically, the compensator 140 may be formed by mixing phosphor with an adhesive configured to fix the phosphor to the circuit board 110 to form phosphor ink, and directly printing the formed phosphor ink on the circuit board 110 to form the phosphor member 141.

[0205] In addition, if Figure 5 and Figure 6 As shown in FIG, the white light emitting device 100 may further include a reflector 150. The reflector 150 may be stacked on the circuit board 110 and reflect the light emitted by the light source 120 toward the light converter 130 to increase the utilization rate of the light source 120. Here, the reflector 150 may be provided as a reflective sheet or a reflective film type.

[0206] When the reflector 150 is configured as a reflective sheet or a reflective film, the compensator 140 may be directly formed on the reflective sheet or the reflective film.

[0207] Specifically, the compensator 140 may be formed by coating the phosphor member 141 on a reflective sheet or film in a regular pattern, or by depositing the phosphor member 141 on a reflective sheet or film in a regular pattern.

[0208] Furthermore, the compensator 140 may be formed by directly printing the phosphor member 141 onto a reflective sheet or film. The compensator 140 may be formed by mixing a phosphor with an adhesive configured to fix the phosphor to the reflective sheet or film to form a phosphor ink, and then directly printing the formed phosphor ink onto the reflective sheet or film to form the phosphor member 141. Here, the phosphor member 141 may be formed in a regular pattern.

[0209] Hereinafter, a white LED including a plurality of light source modules will be described in detail with reference to the accompanying drawings. Like numerals are generally assigned to like components as those in the exemplary embodiment described above, and their detailed description will be omitted.

[0210] Figure 24 is a schematic exploded perspective view of a white light emitting device including a plurality of light source modules, Figure 25 is a schematic perspective view for describing a light source module. Figure 26 is a cross-sectional view of a white light emitting device, and Figure 27 is a cross-sectional view of a white light emitting device further including a coating layer.

[0211] Reference Figure 24 , the white light emitting device includes a substrate, a plurality of light source modules 320 emitting monochromatic light, and a light converter 130 converting the monochromatic light emitted from the plurality of light source modules 320 into white light.

[0212] The light source module 320 is coupled on the base 310. The base 310 may be formed of plastic or reinforced plastic, but is not limited thereto.

[0213] Furthermore, the base 310 may be omitted or replaced with a different component as desired. For example, Figure 22 The frame 210 shown in FIG. 2 may become the base 310 . That is, the plurality of light source modules 320 may be coupled to the frame 210 .

[0214] In addition, a reflective member is provided on the surface of the base 310 to reflect the monochromatic light incident through the light source module 320 toward the light converter 130 .

[0215] The light converter 130 converts monochromatic light into white light. The light converter 130 is spaced a certain distance from the light source module 320, converts the monochromatic light emitted from the light source module 320 into white light, and emits the white light forward. To this end, the light converter 130 may include a phosphor that converts the wavelength of the incident monochromatic light and emits monochromatic light of a different color.

[0216] The plurality of light source modules 320 may be spaced apart from each other by a specific distance D1. At this time, the distances between the light source modules 320 may be the same, but the distances between the light source modules 320 may be different from each other when necessary. For example, the distance between the second light source module 320-2 and the third light source module 320-3 may be smaller than the distance between the first light source module 320-1 and the second light source module 320-2, but the present invention is not limited thereto.

[0217] Reference Figure 25 and Figure 26 , the light source module 320 - 1 includes a circuit board 110 , a compensator 140 and a plurality of light sources 120 .

[0218] A plurality of light sources 120 are mounted on the circuit board 110. The circuit board 110 may be provided in a long strip shape.

[0219] The length L of the circuit board 110 may be determined to correspond to the length of the white light emitting device 300, and the width W1 of the circuit board 110 may be determined to correspond to the width of the light source 120. Specifically, as Figure 25 As shown in , the width W1 of the circuit board 110 may be greater than the width W2 of the light source 120, but is not limited thereto, and the width W1 of the circuit board 110 may have a width in which the light emitting device kit of the light source 120 may be mounted.

[0220] The plurality of light sources 120 are mounted on the circuit board 110 at a specific pitch and emit monochromatic light. The pitches between the plurality of light sources 120 may be the same, but the plurality of light sources 120 may also be arranged to have different pitches from each other.

[0221] The compensator 140 is disposed between the light converter 130 and the circuit board 110 to improve color uniformity of the white light emitting device 300. Specifically, the compensator 140 converts incident monochromatic light into white light and outputs white light to reduce color mura of the white light emitting device 300.

[0222] The compensator 140 may include a plurality of phosphor components 141 that convert incident monochromatic light into white light and output the white light. In this case, the phosphor components 141 may include phosphors formed of at least one phosphor material and converting the wavelength of the incident monochromatic light. The phosphor material forming the phosphor components 141 may be determined according to the monochromatic light incident from the light source 120.

[0223] The compensator 140 may be provided by forming a plurality of phosphor members 141 on the circuit board 110. Specifically, the compensator 140 may be formed by coating the phosphor members 141 on the circuit board 110 in a regular pattern, or by depositing the phosphor members 141 on the circuit board 110 in a regular pattern.

[0224] Furthermore, the compensator 140 may be formed by directly printing the phosphor member 141 on the circuit board 110. Specifically, the compensator 140 may be formed by mixing phosphor with an adhesive for fixing the phosphor to the circuit board 110 to form phosphor ink, and directly printing the formed phosphor ink on the circuit board 110 to form the phosphor member 141.

[0225] The phosphor member 141 may be disposed inside or outside the light source 120, but the position of the phosphor member 141 is not limited thereto. For example, as described above, the phosphor member 141 may be formed inside the light source 120 or outside the light source 120, or may be formed inside and outside the light source 120.

[0226] The phosphor member 141 may be formed in various shapes. Figure 25 As shown in FIG, the phosphor member 141 may be formed in a rectangular shape. At this time, the length of the phosphor member 141 may correspond to the width W2 of the light source 120 or the width W1 of the circuit board 110, but is not limited thereto.

[0227] The plurality of phosphor members 141 may be formed to have a specific pattern. Figure 25 As shown in FIG, the phosphor members 141 may be formed to have a certain interval in the longitudinal direction of the light source module 320 - 1 , but the pattern of the phosphor members 141 is not limited thereto.

[0228] At the same time, if Figure 27As shown in FIG, the white light emitting device 300 may further include a transparent coating layer 330. The coating layer 330 may be stacked on the circuit board 110, and the phosphor member 141 is formed in the coating layer 330 to prevent the phosphor member 141 and the circuit board 110 from being damaged.

[0229] Figure 28 is an exploded perspective view of a white light emitting device further comprising a reflector, and Figure 29 is a cross-sectional view of a white light emitting device further comprising a reflector.

[0230] Reference Figure 28 and Figure 29 , the white light emitting device 300 including the plurality of light source modules 320 may further include a reflector 340 .

[0231] The reflector 340 may be stacked on the plurality of light source modules 320 and reflect light emitted from the light source 120 toward the light converter 130 to improve the usage efficiency of the light source 120. At this time, the reflector 340 may be provided as a reflective sheet or reflective film type.

[0232] The reflector 340 may be provided by a method of being stacked on the light source module 320 on which the light source 120 is mounted. To this end, the reflector 340 may include a plurality of openings formed to correspond to the plurality of light sources 120. The diameter of the opening formed in the reflector 340 may be larger than the diameter of the light source 120.

[0233] As described above, since the reflector 340 is provided by a method of stacking on the light source module 320 on which the light source 120 is mounted, repairability of the light source 120 may be improved.

[0234] As is apparent from the above description, the color uniformity of a white light emitting device can be improved by converting monochromatic light reflected and refracted inside the white light emitting device into white light.

[0235] Furthermore, color mura may be effectively compensated by determining the arrangement of phosphor members according to the pattern of color mura of the white light emitting device.

[0236] While certain exemplary embodiments have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these exemplary embodiments without departing from the scope as defined in the appended claims and their equivalents.

Claims

1. A light-emitting device comprising: plate; a reflective sheet, disposed on the plate; a plurality of light sources disposed on the panel, each of the plurality of light sources comprising a light emitting diode configured to emit blue light; as well as a plurality of phosphor members disposed on the reflective sheet to surround the light emitting diode, each of the plurality of phosphor members being configured to convert at least a portion of blue light incident on the plurality of phosphor members into light having a color other than blue, The plurality of light sources include a first light source, a second light source adjacent to the first light source in a row direction, and a third light source adjacent to the second light source in a column direction, the first light source and the second light source are located at an edge of the panel, and the third light source is located at a non-edge of the panel; wherein the plurality of phosphor components include a plurality of first phosphor components disposed on the reflective sheet to surround the first light source, a plurality of second phosphor components disposed on the reflective sheet to surround the second light source, and a plurality of third phosphor components disposed on the reflective sheet to surround the third light source. The number of the plurality of first phosphor components is the same as the number of the plurality of second phosphor components, and the number of the plurality of first phosphor components is greater than the number of the plurality of third phosphor components.

2. The light emitting device according to claim 1, wherein The plurality of first phosphor members are equiangularly arranged around the LEDs of the first light source, the plurality of second phosphor members are equiangularly arranged around the LEDs of the second light source, and the plurality of third phosphor members are equiangularly arranged around the LEDs of the third light source.

3. The light emitting device according to claim 1, wherein The plurality of first phosphor members are arranged equidistantly from one another around the light emitting diodes of the first light source, the plurality of second phosphor members are arranged equidistantly from one another around the light emitting diodes of the second light source, and the plurality of third phosphor members are arranged equidistantly from one another around the light emitting diodes of the third light source. The light emitting device according to claim 1 , wherein: The plurality of first phosphor components are arranged equidistant from the LEDs of the first light source, the plurality of second phosphor components are arranged equidistant from the LEDs of the second light source, and the plurality of third phosphor components are arranged equidistant from the LEDs of the third light source. The light emitting device according to claim 1 , wherein: The plurality of light sources further includes a fourth light source adjacent to the first light source in the column direction, the fourth light source being located at an edge of the panel. The plurality of phosphor components further include a plurality of fourth phosphor components disposed on the reflective sheet to surround the fourth light source. The number of the plurality of fourth phosphor components is the same as the number of the plurality of first phosphor components. The light emitting device according to claim 5 , wherein: The fourth light source is adjacent to the third light source in the row direction.

7. The light emitting device according to claim 1, wherein A size of each of the plurality of first phosphor members is greater than a size of each of the plurality of third phosphor members.

8. The light emitting device according to claim 1, wherein A size of each of the plurality of second phosphor members is greater than a size of each of the plurality of third phosphor members.

9. The light emitting device according to claim 5, wherein A size of each of the plurality of fourth phosphor members is greater than a size of each of the plurality of third phosphor members.

10. Display device, comprising: Display panel; as well as a light emitting device configured to emit light on the display panel, Wherein, the light emitting device comprises: plate; a reflective sheet, disposed on the plate; a plurality of light sources disposed on the panel, each of the plurality of light sources comprising a light emitting diode configured to emit blue light; and a plurality of phosphor members disposed on the reflective sheet to surround the light emitting diode, each of the plurality of phosphor members being configured to convert at least a portion of blue light incident on the plurality of phosphor members into light having a color other than blue, The plurality of light sources include a first light source, a second light source adjacent to the first light source in a row direction, and a third light source adjacent to the second light source in a column direction, the first light source and the second light source are located at an edge of the panel, and the third light source is located at a non-edge of the panel; wherein the plurality of phosphor components include a plurality of first phosphor components disposed on the reflective sheet to surround the first light source, a plurality of second phosphor components disposed on the reflective sheet to surround the second light source, and a plurality of third phosphor components disposed on the reflective sheet to surround the third light source. The number of the plurality of first phosphor components is the same as the number of the plurality of second phosphor components, and the number of the plurality of first phosphor components is greater than the number of the plurality of third phosphor components.

11. The display device according to claim 10, wherein: The plurality of first phosphor members are equiangularly arranged around the LEDs of the first light source, the plurality of second phosphor members are equiangularly arranged around the LEDs of the second light source, and the plurality of third phosphor members are equiangularly arranged around the LEDs of the third light source.

12. The display device according to claim 10, wherein: The plurality of first phosphor members are arranged equidistantly from one another around the light emitting diodes of the first light source, the plurality of second phosphor members are arranged equidistantly from one another around the light emitting diodes of the second light source, and the plurality of third phosphor members are arranged equidistantly from one another around the light emitting diodes of the third light source.

13. The display device according to claim 10, wherein: The plurality of first phosphor components are arranged equidistant from the LEDs of the first light source, the plurality of second phosphor components are arranged equidistant from the LEDs of the second light source, and the plurality of third phosphor components are arranged equidistant from the LEDs of the third light source.

14. The display device according to claim 10, wherein: The plurality of light sources further includes a fourth light source adjacent to the first light source in the column direction, the fourth light source being located at an edge of the panel. The plurality of phosphor components further include a plurality of fourth phosphor components disposed on the reflective sheet to surround the fourth light source. The number of the plurality of fourth phosphor components is the same as the number of the plurality of first phosphor components.

15. The display device according to claim 14, wherein The fourth light source is adjacent to the third light source in the row direction.

16. The display device according to claim 10, wherein A size of each of the plurality of first phosphor members is greater than a size of each of the plurality of third phosphor members.

17. The display device according to claim 10, wherein: A size of each of the plurality of second phosphor members is greater than a size of each of the plurality of third phosphor members.

18. The display device according to claim 14, wherein A size of each of the plurality of fourth phosphor members is greater than a size of each of the plurality of third phosphor members.

Images