KR20110108704A - Light emitting apparatus and display apparatus having the same - Google Patents

Abstract

The embodiment relates to a light emitting device and a display device having the same.
The light emitting device according to the embodiment includes a phosphor layer having a semiconductor light emitting element emitting a first light and a phosphor absorbing the first light and emitting a second light having a longer wavelength than the first light, An array of light emitting devices that emit light of a first color by mixing color of light and second light, the light emitting device array comprising: a first light emitting device having a first rank among a standard chromaticity range of the first color; The light of the second light emitting element having the second rank of the standard chromaticity range of one color is mixed and arranged to approach each other in the reference chromaticity range within the standard chromaticity range.

Description

LIGHT EMITTING APPARATUS AND DISPLAY APPARATUS HAVING THE SAME}

The embodiment relates to a light emitting device and a display device having the same.

Light emitting diodes (LEDs) may be configured to generate light sources using compound semiconductor materials such as GaAs series, AlGaAs series, GaN series, InGaN series, and InGaAlP series.

Such a light emitting diode is packaged and used as a light emitting device that emits various colors, and the light emitting device is used as a light source in various fields such as a lighting indicator for displaying colors, a character display, and an image display.

The embodiment provides a light emitting device capable of providing uniform chromaticity by mixing different chromaticities and a display device having the same.

The embodiment provides a light emitting device having an array of light emitting devices that do not belong to a reference chromaticity region, and a display device having the same.

The light emitting device according to the embodiment includes a phosphor layer having a semiconductor light emitting element emitting a first light and a phosphor absorbing the first light and emitting a second light having a longer wavelength than the first light, An array of light emitting devices that emit light of a first color by mixing color of light and second light, the light emitting device array comprising: a first light emitting device having a first rank among a standard chromaticity range of the first color; The light of the second light emitting element having the second rank of the standard chromaticity range of one color is mixed and arranged to approach each other in the reference chromaticity range within the standard chromaticity range.

A display device according to an embodiment includes a light emitting device including a plurality of light emitting element arrays; And a display panel disposed on one side of the light emitting device, wherein the light emitting device array emits a second light having a longer wavelength than the first light by absorbing the first light and the semiconductor light emitting device emitting first light. And a phosphor layer having a phosphor, the light emitting device emitting light of a first color by the color mixture of the first light and the second light is arrayed, wherein the array of light emitting devices is in the standard chromaticity range of the first color. The first light emitting device having a rank of 1 and the light of the second light emitting device having a second rank of the standard chromaticity range of the first color are mixed and arranged to approach each other in a reference chromaticity range within the standard chromaticity range.

The embodiment can improve the use yield of the light emitting device.

The embodiment can improve the yield of the LED chip which is a semiconductor light emitting device.

The embodiment can provide a uniform surface light source by belonging to the reference chromaticity region through the mixing of light emitting devices having different chromaticity ranks.

1 to 3 are cross-sectional views showing examples of light emitting devices according to the embodiment.
4 illustrates a CIE chromaticity diagram of a white light emitting device according to an embodiment.
5 is a table showing coordinates of the rank of FIG.
6 is a view showing an example of the brightness rank of the blue LED chip according to the embodiment.
7 is a diagram illustrating an example of a forward voltage rank of a blue LED chip according to an embodiment.
8 is a diagram illustrating an example of a peak wavelength rank of a blue LED chip according to an embodiment.
9 illustrates a light emitting device according to an embodiment.
10 to 13 are diagrams showing examples of mixed chromaticity ranks in Examples.
14 is a table illustrating examples of ranks in which chromaticity rank, peak wavelength rank, luminous intensity rank, and forward voltage rank are mixed in an embodiment.
FIG. 15 is a diagram illustrating chromaticity averages and deviations of CIEx and CIEy of the ranks of FIG. 14.
FIG. 16 is a diagram illustrating an example of mixing spectra of a plurality of white light emitting diodes belonging to the ranks of FIG. 14.
17 is a cross-sectional view illustrating a display device according to an exemplary embodiment.
18 to 20 are diagrams illustrating the light emitting device array of FIG. 17.
21 is a cross-sectional view illustrating a display device according to another exemplary embodiment.
FIG. 22 is a diagram illustrating the light emitting device array of FIG. 21.

Hereinafter, with reference to the accompanying drawings as follows. In the description of the embodiment, the thickness of each component is an example, and above or below each component will be described with reference to the drawings. In addition, the technical features of each embodiment are not limited to each embodiment and may be selectively applied to other embodiments.

1 is a side sectional view showing a light emitting device according to the first embodiment.

Referring to FIG. 1, the light emitting device 10 is electrically connected to the package body 11, the plurality of lead electrodes 12 and 13, and the plurality of lead electrodes 12 and 13 having a cavity 14 having an open upper portion. The connected LED chip 15 and the resin material 17 formed in the cavity.

The package body 11 may be formed of any one of a silicon material, a ceramic material, and a resin material. For example, silicon, silicon carbide (SiC), aluminum nitride (AlN), and polyphthalamide may be used. (polyphthalamide: PPA), a liquid crystal polymer (Liquid Crystal Polymer: LCP) may be made of at least one material, but is not limited thereto. In addition, the package body 11 may be formed of a structure of a single layer or a multilayer substrate, or may be injection molded, and is not limited to the shape or structure of such a package body.

A cavity 14 having an opening is formed in an upper portion of the package body 11. The surface shape of the cavity 14 may be formed in a concave cup shape or a concave tube shape having a predetermined curvature, and the surface shape may be formed in a circle or a polygon, and the like may be changed.

The circumference of the cavity 14 may be formed to be inclined outward with respect to the package bottom surface, and reflects incident light in the opening direction.

A plurality of lead electrodes 12 and 13 penetrating to both sides are disposed in the package body 11, and the plurality of lead electrodes 12 and 13 are disposed on the bottom surface of the package body 11 to be external electrodes. Can be used. The light emitting device 10 may be used in a top view form.

The plurality of lead electrodes 12 and 13 may be formed of a lead frame type, a metal thin film type, a pattern type of a PCB, or the like. Hereinafter, a description will be given of the lead frame type for convenience of description.

The light emitting diode chip 15 may be attached to the first lead electrode 12 with a conductive adhesive, and may be electrically connected to the second lead electrode 13 by the wire 16. The LED chip 15 may be mounted using a wire bonding, die bonding, or flip bonding method, and the bonding method may be changed according to the chip type and the electrode position of the chip.

The light emitting diode chip 15 may optionally include a semiconductor light emitting device manufactured using a compound semiconductor of Group 3 and Group 5 elements such as AlInGaN, InGaN, GaN, GaAs, InGaP, AllnGaP, InP, InGaAs, and the like. can do.

In addition, each LED chip 15 may be formed of a blue LED chip, a yellow LED chip, a green LED chip, a red LED chip, a UV LED chip, an amber LED chip, a blue-green LED chip, and the like. In addition, the number and type of light emitting diode chips 15 disposed in the light emitting device 10 may be changed, and when a plurality of light emitting diode chips 10 are arranged, light having light emission peaks having the same color as each other may be provided. Can emit light.

The resin material 17 is formed in the cavity 14. The resin material 17 may use a transparent resin material such as silicone or epoxy. In addition, the surface of the resin material 17 may be formed in a flat shape, concave shape, convex shape, a lens may be attached to the resin material 17.

At least one kind of phosphor may be added to the resin 17. The phosphor may be a yellow phosphor or may include a yellow phosphor and a red phosphor. For example, the light emitting diode chip 15 is a blue LED chip, and the phosphor is a yellow phosphor, or a structure in which a yellow phosphor and a red phosphor are mixed will be described as an example.

The rank of the light emitting device 10 may measure light emitted from the light emitting device, and may classify the light into a chromaticity rank, a light intensity rank, and a peak wavelength rank according to the measured optical properties.

2 is a side sectional view showing a light emitting device according to the second embodiment. In the description of the second embodiment, the same or similar parts as the first embodiment will be referred to the first embodiment.

Referring to FIG. 2, a light emitting device 20 includes a light emitting device 25 mounted on first and second lead electrodes 22 and 23 on a ceramic substrate 21, and includes a phosphor on the light emitting device 25. The resin 27 is formed. The resin 27 may include a yellow phosphor or a yellow phosphor and a red phosphor. The light emitting device 25 may be mounted in a flip method, and the flip method may have a wide orientation angle, and may lower the height of the resin material 27 by removing a wire.

Third and fourth lead electrodes 24 and 25 are disposed under the ceramic substrate 21, and the third and fourth lead electrodes 24 and 25 are connected to each other through conductive vias 24. The first to fourth lead electrodes 22, 23, 24, and 25 may be implemented as a circuit pattern using an upper copper foil and a lower copper foil of a ceramic substrate.

The ceramic substrate 21 is provided in a planar type, and the resin 27 is formed in a convex lens shape.

3 is a side cross-sectional view illustrating a light emitting device according to a third embodiment. In describing the third embodiment, the same or similar parts as the third embodiment will be referred to the first embodiment.

Referring to FIG. 3, the light emitting device 30 forms a resin material 37 in a cavity 34 of a package body 31, and arranges a plurality of lead electrodes 32 and 33 in the cavity 34. The light emitting element 35 is connected to the lead electrodes 32 and 33 by a plurality of wires 36.

The lead electrodes 32 and 33 are bent and / or bent at least once after being exposed to the outside of the package body 31, and are arranged in side view type or top view type.

 The resin material 37 may be a yellow phosphor or a yellow phosphor and a red phosphor.

The light emitting device according to the first to third embodiments disclosed above is a white light emitting device, and the following embodiment will be described with reference to the white light emitting device and its optical characteristics as an example.

The white light emitting element basically has a chromaticity close to white, but since there is a nonuniformity in the manufacturing process, the actual chromaticity becomes nonuniform within a predetermined chromaticity range. The white light emitting device has a nonuniformity of a blue LED chip and a nonuniformity of a yellow phosphor amount, and this nonuniformity causes the LED of the ideal chromaticity range to not be stably supplied in large quantities. Therefore, the white light emitting device has a relatively large chromaticity range, and the LED maker cannot stably supply a white light emitting device having a narrow reference chromaticity range, thereby partitioning the chromaticity range among manufactured products. The white light emitting device may exist in a predetermined chromaticity range, for example as shown in FIG. 4.

4 is a diagram illustrating CIEx and CIEy chromaticity of the white light emitting device according to the embodiment, FIG. 5 is a view showing coordinate examples of the chromaticity ranks of FIG. 4, and FIG. 6 is a light intensity rank of the blue LED chip according to the embodiment. 7 is a view showing an example of the forward voltage rank of the LED chip according to the embodiment, Figure 8 is a view showing an example of the peak wavelength rank of the blue LED chip according to the embodiment.

4 and 5, in the CIE chromaticity diagram, the predetermined standard chromaticity range 111 may be divided into 15 chromaticity ranks A to 0, and a narrow region based on the H rank of the center of the ranks may be defined. The reference chromaticity range 113 is obtained. The reference chromaticity range 113 has a narrower range than the predetermined standard chromaticity range 111, for example, the available chromaticity range, so that the use yield of the LED chip may be lowered.

The embodiment may provide an array in which light emitting devices present in predetermined standard chromaticity ranges 111 are mixed such that the mixed chromaticity of the emitted light falls within the reference chromaticity range.

Here, the coordinates (CIEx, CIEy) information of the predetermined standard chromaticity range 111 is (0.2648, 0.2285), (0.2468, 0.2315), (0.2633, 0.2715), (0.2813, 0.2685). The reference chromaticity range 113 is an area overlapping with the predetermined standard chromaticity range 111. When the coordinates CIEx and CIEy information are viewed, (0.2729, 0.2420), (0.2501, 0.2420), (0.2501, 0.2579), (0.2725, 0.2579), and the area overlapping with the predetermined standard chromaticity range 111 of the range 113 connecting these 4 coordinates is used as the reference chromaticity range 113.

The coordinate of chromaticity rank A of FIG. 5 is a range within a line segment connecting Z1-Z2, Z2-Z3, Z3-Z4, Z4-Z1 of FIG. 4, and each coordinate is Z1 (0.2528, 0.2305) and Z2 (0.2468, 0.2315). ), Z3 (0.2501, 0.2395), (0.2561, 0.2385), and the range of other ranks B to O can also be represented as shown in the table.

Here, in the chromaticity ranks A to 0, in the CIEx direction, the distance between Z1 and Z2 is 0.060, the distance between Z2 and Z3 is 0.033, the distance between Z3 and Z4 is 0.060, and the distance between Z4 and Z1 is about 0.033. In the chromaticity ranks A to 0, in the CIEy direction, Z1 and Z2 are 0,010, Z80 between Z2 and Z3, 0.010 between Z3 and Z4, and 0.080 between Z4 and Z1.

The range of the optimal chromaticity rank within the reference chromaticity range 111 is chromaticity rank H, and coordinates (CIEx, CIEy) of (0.2654, 0.2375), (0.2561, 0.2385), (0.2594, 0.2465), and (0.2654, 0.2455). ), And the internal area of the line segment connecting these coordinates with each other.

FIG. 6 is a view illustrating a light intensity rank according to an embodiment, and the light intensity rank may be classified into three, for example, rank L1 (4.0Cd to 4.4Cd), L2 (4.4Cd to 4.8Cd), and M1 (4.8Cd to 5.2). Cd), and the gap between ranks between them is in the range of 0.0 to 0.8. The range of the reference brightness rank may be set to 4.6 Cd ± 0.2 Cd in the above-described light rank.

FIG. 7 is a diagram illustrating an example of a forward voltage rank of an LED chip according to an exemplary embodiment. The forward voltage rank may be classified into two ranks, and the voltage difference between the ranks may be divided into about 0.20 to 0.40V.

8 is a view showing a peak wavelength rank of a blue LED chip according to an embodiment, the peak wavelength rank can be divided into, for example, three ranks for the peak wavelength among the wavelength of the blue color band, rank a is 434 ~ 441nm, rank b Is 441 ~ 445nm, rank c can be divided into 445 ~ 451nm. The interval between peak wavelength ranks may be about 0 nm to about 13 nm, and the reference peak wavelength rank may be set to about 443 nm ± 2 nm.

The light emitting device according to the embodiment emits light having a characteristic of a rank by a selective combination of the chromaticity rank, the luminance rank, the forward voltage rank, and the peak wavelength rank.

9 is a view showing a light emitting device using a plurality of light emitting devices according to the embodiment, wherein the first and second light emitting devices 41 and 42 are white light emitting devices, and the directing angles of the light emitting devices 41 and 42 are The angle ranges from 100 to 180 °. The light emitted from the first light emitting device 41 emits light in the first rank 01, and the light emitted from the second light emitting device 42 emits light in the second rank 02. The first rank 01 and the second rank 02 are mixed with each other on the mixing region, and the mixed light may be the mixing rank 03. In the mixing rank 03, at least one rank among chromaticity rank, luminous intensity rank, and peak wavelength rank has a different rank.

The light emitting elements 41 and 42 are selected as positions that can be provided as an optimal surface light source in consideration of the directivity angle, the brightness, the position of the mixed region (ie, the distance from the panel), and thus the adjacent light emitting elements ( The distance (D1) between the 41, 42) may be spaced apart from about 15mm ~ 100mm, but is not limited thereto.

The mixing rank 03 of the light emitting device 40 is mixed by the light emitting elements 41 and 42 having different chromaticity ranks, or mixed by the light emitting elements 41 and 42 having different luminous intensity ranks, or different from each other. It can be mixed by the light emitting elements 41 and 42 having the peak wavelength rank. The mixing rank of the embodiment is mixed using at least one of the ranks of chromaticity and luminous intensity peak wavelength, and the characteristics of the mixed rank increase or decrease the rank characteristic of each light emitting device in a zero island manner. The characteristics of the mixed rank may be shifted to the reference rank range rather than the rank characteristics before mixing. In addition, the mixing rank 03 may move the first rank 01 and the second rank 02 in a direction opposite to each other.

For example, the plurality of light emitting devices 41 and 42 may combine a white light emitting device having a chromaticity difference of Δx> 0.010 and Δy> 0.010 on an XY chromaticity coordinate.

10 to 13 are diagrams showing examples of mixing chromaticity ranks of a plurality of white light emitting devices in an embodiment.

The position of the mixed chromaticity rank of the plurality of white light emitting elements is a value approximately the center of the line segment connecting the positions of two different chromaticity ranks in a straight line. That is, the white light emitting device is within the reference chromaticity range. That is, it can be narrowly comprised in a reference chromaticity range from the white light emitting element which has chromaticity rank different from each other.

As shown in FIG. 10, the first light emitting device is chromaticity rank A, the second light emitting device is chromaticity rank O, and the mixed chromaticity rank is in the range of chromaticity rank H which is the central position on the G1 line connecting the chromaticity rank AO. .

The first light emitting device is chromaticity rank C, the second light emitting device is chromaticity rank M, and the mixed chromaticity rank is in the range of chromaticity rank H which is the central position on the G2 line connecting the chromaticity rank C-M.

Likewise, the chromaticity rank of chromaticity ranks D and O is in the range of chromaticity rank H, which is the central position on the G3 line connecting chromaticity rank D-0, and the chromaticity rank of chromaticity ranks F and J is chromaticity rank FJ. The range of chromaticity rank H which is the center position on the G4 line which couple | cross-linked becomes, and the mixed chromaticity rank of chromaticity rank B and N becomes the range of chromaticity rank H which is the center position on the G5 line which connected chromaticity rank BN.

Referring to FIG. 11, a mixed chromaticity rank is a chromaticity rank H that is a center position on a G6 line by mixing chromaticity ranks M and B, and a chromaticity rank H that is a center position on a G7 line by mixing chromaticity ranks D and O.

Referring to FIG. 12, the mixed chromaticity rank is a chromaticity rank H which is a central position on the G8 line by mixing chromaticity ranks F and M. FIG.

10 to 12, the mixed chromaticity rank may selectively mix at least one of chromaticity ranks A, B, and C with M, N, O, or J, K, L based on chromaticity rank H. . In addition, the mixed chromaticity rank may selectively mix at least one of chromaticity ranks D, E, and F with M, N, O, or J, K, L based on the chromaticity rank H. Similarly, at least one of chromaticity ranks A and D is optionally mixed with chromaticity ranks L and O, and at least one of chromaticity ranks C and F is optionally mixed with chromaticity ranks M and J, and at least one of chromaticity ranks B and E May be optionally mixed with chromaticity ranks N, K as well as chromaticity ranks M, J, O, L and the like.

Referring to FIG. 13, the chromaticity rank H, which is the central position of the connection lines G9 of the three chromaticity ranks B, M, and O, becomes the mixed chromaticity rank. That is, three or more chromaticity ranks may be mixed so as to fall within the reference chromaticity range, for example, a mixture of chromaticity ranks A, C, and N, a mixture of chromaticity ranks D, F, and N, and a mixture of chromaticity ranks A, F, and K. The mixture chromaticity rank can be comprised by the combination of rank D, C, N, etc. mixing. This mixed chromaticity rank is located in the reference chromaticity range.

As shown in FIG. 10 to FIG. 13, a chromaticity rank range narrower than the chromaticity rank distribution before mixing by mixing two or more chromaticity ranks opposite to the reference chromaticity range among chromaticity ranks A to O ranks, that is, Combinations may be placed in the reference chromaticity range.

In addition, the plurality of light emitting devices of the embodiment have different chromaticity ranks, one of which may further combine a light emitting device in the reference chromaticity range.

14 is a table table showing a mixing example of a mixing rank.

Referring to FIG. 14, the first rank R1 and the second rank R2 are formed by mixing chromaticity ranks A to 0, luminous intensity ranks L1 and L2, and peak wavelength ranks a, b, and c. The above mixed rank combinations (LED Group) can be made. Several combination samples of these mixed rank combinations will be described as examples.

The first mixing rank group G11 is a mixture of ranks having the same chromaticity rank (H) and having different luminous intensity ranks (L1, L2) or peak wavelength ranks (a, b, c), for example, five mixing ranks ( A01, A11, A15, A34), but is not limited to this number of ranks.

The second mixing rank group G12 has different chromaticity ranks (D, L) (F, J), and mixes the same or different luminance ranks (L1, L2) or peak wavelength ranks (a, b, c). For example, it may be classified into six mixed ranks B01, B11, B15, D01, D11, and D15, but is not limited to the number of ranks.

The third mixed rank group G13 has different chromaticity ranks (C, M) (A, O) and mixes the same or different luminous intensity ranks (L1, L2) or peak wavelength ranks (a, b, c). For example, it may be classified into six mixed ranks (P01, P11, P15, N01, N11, N15), but is not limited to the number of ranks. Ranks combined with the above-described mixing ranks are one example, and are not limited to the above rank combinations.

The embodiment can make dozens of combinations by mixing standard chromaticity rank, luminous intensity rank, peak wavelength rank, etc., and mixing the reference chromaticity range by mixing the light of a plurality of light emitting devices having different chromaticity ranks among these ranks. It can be configured with a rank.

The embodiments classify the ranks in the CIE xy chromaticity according to the light characteristics of the light emitting device, that is, the chromaticity and the luminance, respectively, wherein the classified ranks are complementary to each other based on the ranks of the reference chromaticity range (eg, white) region and / or A light emitting device having chromaticities in a symmetric relationship may be combined and mixed in a reference chromaticity range.

FIG. 15 illustrates chromaticity averages Avg and chromaticity deviations of the mixed ranks A15 to N15 of the LED groups disclosed in FIG. 14 according to an embodiment. The chromaticity averages of the mixed ranks are averaged based on the chromaticity rank, and the average value thereof may be 0.263 or less, but is not limited thereto. The chromaticity deviation represents the chromaticity deviation of the first rank and the second rank, and may be obtained as a value of the chromaticity deviation of 0.21 or more or 0.43 or less, and the chromaticity average and the deviation may vary according to the position of each chromaticity rank. It does not limit to this.

16 shows an example in which the peak wavelength of the first light emitting device and the peak wavelength of the second light emitting device are synthesized.

FIG. 16 is an example in which an optical spectrum of any of the first rank R1 and the second rank R2 of the first rank group and the second rank group disclosed in FIG. 14 is mixed, and the first rank having different peak wavelengths and luminosities. It is a graph of rank (R0 = R1 + R2) which mixed (R1) and 2nd rank R2.

The first rank R1 has a wavelength spectrum having an emission wavelength of a blue peak of 440 nm, an emission wavelength of a yellow peak of 520 nm, and an emission wavelength of a red peak of 640 nm. The second rank R2 has a wavelength spectrum having an emission wavelength of a blue peak of 457 nm, an emission wavelength of a yellow peak of 520 nm, and an emission wavelength of a red peak of 640 nm. Luminance of the wavelength spectrum of the first rank R1 and the second rank R2 may be different from each other.

Accordingly, the mixing rank R3 of the first rank R1 and the second rank R2 may be mixed with the peak wavelength or / and the luminosity in the intermediate range.

17 is a side cross-sectional view illustrating a display device according to an exemplary embodiment.

Referring to FIG. 17, the display device 50 includes a bottom cover 52, a plurality of light emitting elements 61 and 62, an optical sheet 54, and a display panel 55 on the module substrate 63. The module substrate 63, the bottom cover 52, and the optical sheet 54 function as the light unit 51.

The bottom cover 52 includes a groove 53 having an open upper portion, and an inner side surface of the groove 53 is formed to be inclined. Here, the bottom cover 52 and its side may be combined into a separate structure.

At least one module substrate 63 may be disposed on an upper side of the bottom cover 52. The light emitting device 61 of the first rank and the second light emitting device 62 of the second rank may be alternately disposed on the module substrate 63.

Here, the first and second light emitting elements 61 and 62 may be arranged, for example, two or more ranks in different chromaticity ranks alternately or in a group. Accordingly, by arranging the first and second light emitting elements 61 and 62 at regular intervals, the first and second light emitting elements 61 and 62 may be mixed in the reference chromaticity range. The multi-rank light emitting devices 61 and 62 may be added or changed, and are not limited to the number of light emitting devices 61 and 62 described above. The plurality of light emitting devices 61 and 62 may be alternately arranged, disposed at positions symmetrical with each other, or arranged in an adjacent row and zigzag form. The light emitting devices 61 and 62 may mix different chromaticity ranks so that the chromaticity of the mixing ranks may be mixed into a reference chromaticity range narrower than a predetermined available chromaticity range. The first rank R1 and the second rank R2 are mixed in a zero island form, and the mixing rank has a reference chromaticity range.

At least one optical sheet 54 may be disposed in a diffusion sheet, a horizontal and vertical prism sheet, a brightness enhancement film, and the like. The diffusion sheet diffuses the incident light, the horizontal and vertical prism sheets focus the incident light onto the display area, and the brightness enhancement film reuses the discarded light to improve light efficiency.

The display panel 55 is, for example, an LCD panel and includes a first and second substrates of transparent materials facing each other, and a liquid crystal layer interposed between the first and second substrates. The first substrate may be implemented by, for example, a color filter array substrate, and the second substrate may be implemented by, for example, a TFT array substrate, or may be embodied in a reverse structure. The display panel may be changed, but is not limited thereto. A polarizing plate may be attached to at least one surface of the display panel, but the polarizing plate is not limited thereto.

18 to 20 illustrate the light emitting device array on the module substrate as an example.

Referring to FIG. 18, the first light emitting device having the first rank R1 and the second light emitting device having the second rank R2 among the ranks that may be combined as shown in FIG. Array in the longitudinal direction. The first rank R1 and the second rank R2 have different chromaticity ranks that do not belong to the reference chromaticity range, and may be mixed in the reference chromaticity range through adjacent two to four mixing ranks. The light emitting device of the first rank R1 and the light emitting device of the second rank R2 may be disposed in the transverse direction and the longitudinal direction in the entire region.

The ranks R1 and R2 of the light emitting device array may mix different chromaticity ranks so that the chromaticity of the mixing ranks may be mixed in a reference chromaticity range narrower than a predetermined available chromaticity range.

Referring to FIG. 19, the light emitting device of the first rank R1 and the light emitting device of the second rank R2 disclosed in FIG. 14 include different chromaticity ranks that do not belong to the reference chromaticity range, and the outermost peripheral part of the light emitting device of FIG. Alternately placed. The ranks R1 and R2 of the light emitting device array may be mixed in different chromaticity ranks at the periphery thereof, and thus the chromaticity of the mixing rank may be mixed in a reference chromaticity range narrower than a predetermined available chromaticity range. Here, the light emitting elements of one column and one row are arrayed. In addition, a light emitting device having a rank O in a chromaticity range may be disposed in an inner region of the light emitting device array.

Referring to FIG. 20, the second light emitting devices of the second rank R2 disclosed in FIG. 4 are arrayed in a first horizontal direction, the light emitting devices of the first rank R1 are arranged in a second horizontal direction, and the second light emitting devices are arranged in the second horizontal direction. The first and second light emitting elements are arranged in a zigzag form. That is, the light emitting elements of the first rank and the second rank may be disposed to be offset from each other. The ranks R1 and R2 of the light emitting device array may be mixed in different chromaticity ranks at the periphery thereof, and thus the chromaticity of the mixing rank may be mixed in a reference chromaticity range narrower than a predetermined available chromaticity range.

21 is a perspective view illustrating a display device according to an exemplary embodiment.

Referring to FIG. 21, the display device 70 includes a light emitting module 80 including a module substrate 83 and light emitting devices 81 and 82 including different chromaticity ranks, a reflective plate 71, and a light guide plate. 72, an optical sheet 73, and a display panel 74. The light emitting module 80, the reflecting plate 71, the light guide plate 72, and the optical sheet 73 function as a light unit. The light unit may be protected by a bottom cover or a bottom chassis.

In the light emitting module 80, first and second light emitting devices 81 and 82 of different chromaticity ranks are alternately arranged on the module substrate 83. The module substrate 83 may be a rigid substrate or a flexible substrate.

The light emitting module 80 includes, for example, the first light emitting device 81 and the second light emitting device 82 including a blue LED chip and a yellow phosphor, or a blue LED chip, a yellow phosphor, and a red phosphor.

The light emitting module 80 alternately arranges two adjacent light emitting devices 81 and 82 having different chromaticity ranks, or between devices having different chromaticity ranks or reference chromaticity ranges between the two light emitting devices 81 and 82. You can place more. For example, the first light emitting device 81 and the second light emitting device 82 may be alternately arranged, or 1: 2 or 2: 1 may be arranged. The chromaticity emitted from the first and second light emitting devices 81 and 82 of different chromaticity ranks may be mixed and combined into a reference chromaticity range narrower than the preset available chromaticity rank. The first light emitting device 81 and the second light emitting device 82 are mixed in a zero island form, and the mixing rank has a reference chromaticity range.

The light guide plate 72 is disposed on one side of the light emitting module 80, the reflective plate 71 is disposed below the light guide plate 72, and the optical sheet 73 is disposed above. The light guide plate 72 may be spaced apart from the light emitting devices 81 and 82 by 0.5 mm or less, and the material may be made of a PC material or a poly methy methacrylate (PMMA) material, but is not limited thereto.

The light emitted from the light emitting module 80 is incident on the light guide plate 72, and the light guide plate 72 guides the light incident from the light emitting module 80 to the entire area and emits the light to the surface light source. . The reflective plate 71 reflects the light leaking from the light guide plate 72, and the optical sheet 73 diffuses and collects the light incident from the light guide plate 72 to irradiate the display panel. do.

Here, the optical sheet 73 may include at least one of a diffusion sheet, a horizontal and vertical prism sheet, a brightness enhancement film, and the like. The display panel 74 may be implemented as, for example, an LCD panel.

22 to 24 are diagrams illustrating a light emitting device array of the light emitting module disclosed in FIG. 21.

Referring to FIG. 22, the first light emitting device having the first rank R1 and the second light emitting device having the second rank R2 disclosed in FIG. 14 may be alternately arrayed in one column, but the embodiment is not limited thereto. . The first rank R1 and the second rank R2 are mixed in a zero island form, and the mixing rank has a reference chromaticity range.

Referring to FIG. 23, a first light emitting device having a first rank R1 disclosed in FIG. 14, a second light emitting device having a second rank R2, and a third light emitting device having a reference chromaticity rank 0 are alternated. It can be arranged in a single row, but is not limited thereto. The first rank R1, the second rank R2, and the reference chromaticity rank are mixed in the form of a zero island, and the mixing rank has a reference chromaticity range.

Referring to FIG. 24, the first light emitting device having the first rank R1 disclosed in FIG. 14 and the second light emitting device having the second rank R2 are arranged in one group, and spaced apart from another group (D3). ) Here, the distance D2 between the first and second light emitting devices is 15 to 100 mm, and the distance D3 between other groups may be disposed at a wider distance than D2.

Features, structures, effects, and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

In addition, the above description has been made with reference to the embodiment, which is merely an example, and is not intended to limit the present invention. Those skilled in the art to which the present invention pertains will be illustrated as above without departing from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

40: light emitting device, 10, 20, 41, 42, 61, 62, 81, 82: light emitting device, 50, 70: display device, 51; light unit, 52: bottom cover, 63, 83: module substrate, 54, 73: optical sheet, 55, 74: display panel, 71: reflecting plate, 72: light guide plate, 80: light emitting module

Claims (21)

And a phosphor layer having a semiconductor light emitting element emitting a first light and a phosphor absorbing the first light and emitting a second light having a longer wavelength than the first light, by mixing the first light and the second light. An array of light emitting devices for emitting light of a first color,
The array of light emitting devices may include a first light emitting device having a first rank among a standard chromaticity range of the first color, and light of a second light emitting device having a second rank among the standard chromaticity range of the first color; A light emitting device arranged to approach each other with a reference chromaticity range within the standard chromaticity range. The light emitting device of claim 1, wherein the semiconductor light emitting element is a blue LED chip having an emission peak in blue, and the phosphor is a yellow phosphor having an emission peak in yellow. The light emitting device of claim 2, wherein the phosphor comprises a red phosphor having an emission peak in red. The method of claim 1, wherein the first rank and the second rank do not belong to the reference chromaticity range within a standard chromaticity range, and include chromaticity ranks in opposite directions based on the reference chromaticity range. Light emitting device. The light emitting device of claim 4, wherein the first rank and the second rank include a same light rank or a different light rank. The light emitting device of claim 4, wherein the first and second ranks have the same peak wavelength or different peak wavelengths. The light emitting device of claim 2 or 3, wherein the first color comprises white. The method of claim 1, wherein the standard chromaticity range includes coordinates (CIEx, CIEy) of (0.2648, 0.2285), (0.2468, 0.2315), (0.2633, 0.2715), and (0.2813, 0.2685), the adjacent one of said coordinates. A light emitting device comprising an inner region of a line segment connecting the coordinates with each other. The light emitting device of claim 8, wherein the light emitting device emits light in a reference chromaticity range, and the reference chromaticity range is coordinates of (0.2729, 0.2420), (0.2501, 0.2420), (0.2501, 0.2579), (0.2725, 0.2579). A light emitting device comprising an inner region of a line segment connecting CIEx, CIEy) to each other. The light emitting device of claim 1, wherein the first rank and the second rank have a chromaticity difference of at least 0.010 on a chromaticity x or chromaticity y axis. The method of claim 8 or 9, wherein the chromaticity range mixed in the light emitting device array is coordinates (CIEx, CIEy) of (0.2654, 0.2375), (0.2561, 0.2385), (0.2594, 0.2465), (0.2654, 0.2455). And an inner region of a line segment connecting these coordinates to each other. The light emitting device of claim 1, wherein the first light emitting element and the second light emitting element are alternately disposed in at least one of a transverse direction and a longitudinal direction. The light emitting device of claim 1, wherein the first light emitting element and the second light emitting element are arranged in a zigzag in adjacent columns. The light emitting device of claim 1, further comprising a third light emitting device having a third rank within a reference chromaticity range of the first color. The method of claim 1, wherein the array of the light emitting device is characterized in that the chromaticity difference between the first light emitting device disposed in the peripheral portion and the second light emitting device is larger than the chromaticity difference between the first light emitting device and the second light emitting device disposed in the center. Light emitting device. 2. The light emitting device of claim 1, wherein a mixed chromaticity of the first light emitting device and the second light emitting device is zerosum close to a reference chromaticity range of the chromaticity of the first light emitting device and the second light emitting device. The light emitting device of claim 1, further comprising a light guide plate or an optical sheet disposed in a mixed color region of the plurality of light emitting devices. The light emitting device of claim 1, wherein a distance between the first light emitting device and the second light emitting device is in a range of 15 mm to 100 mm. A light emitting device including a plurality of light emitting element arrays; And
A display panel disposed on one side of the light emitting device;
The light emitting device array includes a phosphor layer having a semiconductor light emitting device that emits first light and a phosphor that absorbs the first light and emits a second light having a longer wavelength than the first light, wherein the first light and the The light emitting device which emits light of a first color by the mixing of two light is arrayed,
The array of light emitting devices includes a mixture of light of a first light emitting device having a first rank among the standard chromaticity ranges of the first color, and a light of a second light emitting device having a second rank among the standard chromaticity ranges of the first color; A display device arranged to approach each other with a reference chromaticity range within the chromaticity range. 20. The method of claim 19, wherein the first rank of the first light emitting device and the second rank of the second light emitting device are chromaticity ranks opposed to each other based on a reference chromaticity range, and different luminous intensity ranks or different peak wavelength ranks. Having a display device. The display device of claim 19, wherein a mixed chromaticity of the first and second ranks is mixed in a zero island form.

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