KR20110108705A - 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, And an array of light emitting devices that emit light of a first color by mixing light and second light, the array of light emitting devices comprising: a first light emitting device having a first peak wavelength rank of a first light; The wavelengths of the second light emitting devices having the two peak wavelength rank are arranged to approach each other.

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 a peak wavelength in a uniform range by mixing a plurality of light emitting devices having different peak wavelengths, and a display device having the same.

The embodiment provides a light emitting device having an array such that peak wavelengths of a plurality of light emitting devices are zero sum, 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, And an array of light emitting devices that emit light of a first color by mixing light and second light, the array of light emitting devices comprising: a first light emitting device having a first peak wavelength rank of a first light; The wavelengths of the second light emitting devices having the two peak wavelength rank are arranged to approach each other.

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. A phosphor layer having a phosphor, the array comprising a light emitting element for emitting a first color light by mixing the first light and the second light, the array of light emitting elements having a first peak wavelength rank of the first light And a wavelength of the first light emitting device having a second wavelength and the second light emitting device having a second peak wavelength rank of the first light are arranged to approach each other.

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 being in the reference wavelength range through mixing of light emitting devices having different peak wavelength ranks from each other.

1 to 3 are cross-sectional views illustrating examples of light emitting devices according to embodiments.
4 is a CIE chromaticity diagram of a white light emitting device according to an embodiment.
5 is a table showing coordinates of the chromaticity rank of FIG. 4.
6 is a diagram illustrating an example of a peak wavelength rank of a blue LED chip according to an embodiment.
7 is a diagram illustrating a light emitting device according to an embodiment.
8 is a diagram illustrating an example of the synthesized peak wavelength rank in the embodiment.
9 is a diagram illustrating a spectrum of a synthetic peak wavelength of a white light emitting device according to an embodiment.
10 is a cross-sectional view illustrating a top view display device according to an exemplary embodiment.
11 to 15 are diagrams illustrating the light emitting device array of FIG. 10.
16 is a cross-sectional view illustrating a side display device according to an exemplary embodiment.
17 to 19 are diagrams illustrating the light emitting device array of FIG. 16.

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 view showing 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 peak wavelength of the blue LED chip according to the embodiment. It is a figure which shows the example of rank.

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.

6 illustrates peak wavelengths of a blue LED chip of a white light emitting device according to an exemplary embodiment.

Referring to FIG. 6, the peak wavelength rank of the blue LED chip may be divided into, for example, three ranks with respect to the peak wavelength among the wavelengths of the blue color band, and the first peak wavelength rank R1 is 434 nm to 441 nm and the second peak wavelength. The rank R2 may be divided into 441 nm to 445 nm, and the third peak wavelength rank R3 may be divided into 445 nm to 451 nm. An interval between each peak wavelength rank may be about 0 nm to about 13 nm. The embodiment may set the range of the minimum peak wavelength (for example, 434 nm) and the maximum peak wavelength (for example, 451 nm) of the blue LED chip to the standard peak wavelength range.

The light emitting device array according to the embodiment may be configured to have desired optical characteristics by a selective combination of the chromaticity rank and the peak wavelength rank.

7 is a view showing a light emitting device using a plurality of light emitting elements according to the embodiment, Figure 8 is a view showing an example of the composite peak wavelength rank according to the embodiment.

Referring to FIG. 7, the first and second light emitting devices 41 and 42 are white light emitting devices, and the directivity angles of the light emitting devices 41 and 42 range from about 100 ° to about 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. Said mixing rank 03 has a rank in which at least the peak wavelength rank is different from a chromaticity rank and a peak wavelength 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 may be mixed by the light emitting elements 41 and 42 having ranks of different peak wavelengths, and the mixing rank may have the same chromaticity rank or different chromaticity ranks. Can be. The mixing rank of the embodiment has a difference in the peak wavelength rank and lights of the same chromaticity rank or different chromaticity ranks are mixed. The mixed rank characteristic increases and decreases the rank characteristic of each light emitting device in a zero island manner. The characteristics of the mixed rank is to be mixed in the form of a zero island, the mixing rank 03 may move the first rank (01) and the second rank (02) in the direction opposite to each other.

For example, the plurality of light emitting devices 41 and 42 may be arranged such that peak wavelengths have a difference of at least about 4 nm. Here, the mixed peak wavelengths of the adjacent light emitting elements 41 and 42 may be mixed to approach an intermediate value between the minimum value and the maximum value.

Referring to FIG. 8, an example of mixing peak wavelength ranks of blue LED chips of the plurality of white light emitting devices 41 and 42 disclosed in FIG. 7 is illustrated. The first synthetic peak wavelength rank (R1 + R2) is mixed in the range of 438 nm to 442 nm, the second synthetic peak wavelength rank (R2 + R3) is mixed in the range of 443 nm to 448 nm, and the third synthetic peak wavelength rank (R1). + R3) is mixed in the range of 441 nm to 445 nm.

Here, the first synthesis peak wavelength rank (R1 + R2) is, for example, a blue LED chip in the range of 434nm ~ 441nm of the first rank (R1) shown in Figure 5 and 441nm ~ 445nm range of the second rank (R2) The peak wavelength of the blue LED chip belonging to can be mixed to achieve 438nm to 442nm. Thus, the first synthetic peak wavelength rank (R1 + R2) may be in the range of minimum <(R1 + R2) <maximum, which may be mixed to approximate the average of the two peak wavelengths.

FIG. 9 is a diagram illustrating an example in which peak wavelengths of a first rank and a second rank are mixed according to an embodiment, and any one of a wavelength of a first peak wavelength rank R1 and a second peak wavelength rank R2 is shown. The combined peak wavelength rank (R1 + R2), which combines the wavelengths, has a wavelength spectrum in the middle of the two wavelengths.

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

Referring to FIG. 10, the display device 50 includes a bottom cover 52, a module substrate 63, and a plurality of light emitting elements 61 and 62, an optical sheet 54, and a display panel 55 thereon. do. 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 peak wavelength rank and the second light emitting device 62 of the second peak wavelength 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 peak wavelength 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 can be mixed at a desired peak wavelength. The light emitting devices 61 and 62 of the multi-peak wavelength rank may be added or changed, and are not limited to the number of light emitting devices 61 and 62. 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. Since the light emitting devices 61 and 62 mix different peak wavelength ranks, the peak wavelengths of the mixed ranks are represented by a value in which different peak wavelengths are mixed in a zero sum form.

The light emitting devices 61 and 62 may be arranged in ranks within the standard chromaticity range or the reference chromaticity range within the standard chromaticity range, or may be arranged such that the mixed chromaticity range is mixed in the standard 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.

The light emitting device array on the module substrate has been described with reference to FIGS. 11 to 15 as an example.

Referring to FIG. 11, the light emitting device array includes a first light emitting device having a first peak wavelength rank R1 and a second having a second peak wavelength rank R2 among the peak wavelength ranks that may be combined as shown in FIG. 6. The light emitting elements are alternately arrayed in the row direction and the longitudinal direction. The first peak wavelength rank R1 and the second peak wavelength rank R2 are different peak wavelengths, and light emitting devices having the peak wavelengths may be disposed in the row direction and the longitudinal direction in all regions.

The light emitting device array mixes different peak wavelength ranks R1 and R2 so that the peak wavelength of the mixed rank is in a direction opposite to a predetermined minimum wavelength value (eg 434 nm) or maximum wavelength value (eg 451 nm). Will move.

Referring to FIG. 12, the light emitting device array is alternately disposed along the outermost portion of the light emitting device having the first peak wavelength rank R1 and the light emitting device having the second peak wavelength rank R2 disclosed in FIG. 6. . The peak wavelength ranks R1 and R2 of the light emitting device array are mixed at different peak wavelength ranks at the periphery thereof, so that the mixing ranks may be mixed at peak wavelengths between the two peak wavelength ranks. Here, the light emitting elements of one column and one row are arrayed. In addition, a light emitting device having a second peak wavelength rank or a rank O of a reference chromaticity range may be disposed in an inner region of the light emitting device array.

Referring to FIG. 13, a first light emitting device having the first peak wavelength rank R1 disclosed in FIG. 6 is arranged in a first row, and a second light emitting device having the second peak wavelength rank R2 is arranged in a second row. The first and second light emitting devices are arranged in a zigzag form. That is, the first light emitting element and the second light emitting element may be disposed to be offset from each other. The peak wavelength ranks R1 and R2 of the light emitting device array have a peak wavelength between two peak wavelengths.

Referring to FIG. 14, the light emitting device array alternately arranges the first and second light emitting devices having the first peak wavelength rank R1 and the second peak wavelength rank R2 in the first row, and the second row. The second and third light emitting devices having the second peak wavelength rank R2 and the third peak wavelength rank R3 are alternately arranged. Such an array form may be disposed in an entire region, such that light emitting devices having different peak wavelengths may be mixed and arranged.

Referring to FIG. 15, the light emitting device array includes a first light emitting device having a first peak wavelength rank R1 in a first row and a second light emitting device having a second peak wavelength rank R2 in a second row. And a third light emitting device having a third peak wavelength rank R3 in the middle row of the first row and the second row. The third light emitting device may be arranged in a zigzag form from the first light emitting device and the second light emitting device. Such an array form may be disposed in an entire region, such that light emitting devices having different peak wavelengths may be mixed and arranged.

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

Referring to FIG. 16, the display device 70 includes a light emitting module 80, a reflective plate 71, and a light guide including a module substrate 83 and light emitting devices 81 and 82 including different peak wavelength ranks. The plate 72, the optical sheet 73, and the display panel 74 are included. 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 having different peak wavelength ranks are alternately arranged on the module substrate 83. The module substrate 83 may be a rigid substrate or a flexible substrate.

For example, the light emitting module 80 may include a blue LED chip and a yellow phosphor, or include 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 peak wavelength ranks, or has a different peak wavelength rank or reference chromaticity range between the two light emitting devices 81 and 82. The device can be further arranged. 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. Light emitted from the first and second light emitting devices 81 and 82 of different peak wavelength ranks may be mixed to become a target peak wavelength. Peak wavelengths of the first light emitting device 81 and the second light emitting device 82 are mixed in the form of zero islands, 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.

17 to 19 are diagrams illustrating a light emitting device array of the light emitting module disclosed in FIG. 16.

Referring to FIG. 17, the first light emitting device having the first peak wavelength rank R1 and the second light emitting device having the second peak wavelength rank R2 may be alternately arrayed in one column, but the embodiment is not limited thereto. . The wavelengths of the first peak wavelength rank R1 and the second peak wavelength rank R2 are mixed in a zero island form.

Referring to FIG. 18, a first light emitting device having a first peak wavelength rank R1, a second light emitting device having a second peak wavelength rank R2, having an arbitrary peak wavelength and having a reference chromaticity rank 0 The third light emitting devices may be alternately arranged in one row, but the embodiment is not limited thereto. The first peak wavelength rank R1, the second peak wavelength rank R2, and any peak wavelength are mixed in the form of a zero island, and the mixing rank has a reference peak wavelength.

Referring to FIG. 19, a first light emitting device having a first peak wavelength rank R1 and a second light emitting device having a second peak wavelength 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.

The light emitting device array according to the embodiment may be installed in a street lamp, a headlamp, a lamp, a signboard, and the like, but is not limited thereto.

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 (18)

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,
And the array of light emitting devices is arranged such that wavelengths of a first light emitting device having a first peak wavelength rank of first light and a wavelength of a second light emitting device having a second peak wavelength rank of first light approach each other. 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 light emitting device according to any one of claims 1 to 3, wherein the first peak wavelength rank and the second peak wavelength rank have a peak wavelength difference of at least 4 nm. The method of claim 4, wherein the first peak wavelength rank is 434nm ~ 441nm,
The second peak wavelength rank is 445 ~ 451nm light emitting device. The light emitting device of claim 4, wherein the light emitting device array includes a third light emitting device having a third peak wavelength rank of the first light,
The third peak wavelength rank is in the range of 434nm to 451nm. The light emitting device of claim 2 or 3, wherein the first color comprises white. According to claim 1, wherein the light emitting device has a standard chromaticity range of (0.2648, 0.2285), (0.2468, 0.2315), (0.2633, 0.2715), and (0.2813, 0.2685) coordinates (CIEx, CIEy) connected to each other A light emitting device comprising an inner region of the. The light emitting device of claim 8, wherein the at least one light emitting device disposed in the light emitting device array emits light having a reference chromaticity range, wherein the reference chromaticity range is (0.2729, 0.2420), (0.2501, 0.2420), (0.2501, 0.2579). And an inner region of a line segment connecting the coordinates (CIEx, CIEy) of (0.2725, 0.2579) to each other. The chromaticity range of the mixed light in the array of light emitting devices is determined by the coordinates (CIEx, CIEy) of (0.2654, 0.2375), (0.2561, 0.2385), (0.2594, 0.2465), (0.2654, 0.2455). Light emitting device comprising. 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 method of claim 1, wherein the array of the light emitting device is a difference between the peak wavelength of the first light emitting device and the second light emitting device disposed in the peripheral portion is greater than the difference between the peak wavelength of the first light emitting device and the second light emitting device disposed in the center Light emitting device, characterized in that. 3. The light emitting device of claim 2, wherein the mixed wavelengths according to the array of first and second light emitting elements are mixed to approach a median of the minimum and maximum values of the standard peak wavelength range of blue light emitted from the blue LED chip. The light emitting device according to claim 1, further comprising a light guide plate or an optical sheet disposed on the light output side of the plurality of light emitting elements. 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 An array of light emitting elements for emitting light of a first color by mixing of two lights,
And the array of light emitting devices is arranged such that wavelengths of a first light emitting device having a first peak wavelength rank of first light and a wavelength of a second light emitting device having a second peak wavelength rank of first light approach each other. The display device of claim 17, wherein the first peak wavelength rank of the first light emitting device and the second peak wavelength rank of the second light emitting device are mixed in a zero island form.

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