KR102550461B1 - Optical lens, light emitting module and light unit having thereof - Google Patents

Abstract

An embodiment discloses an optical lens and a light emitting module having the same.
An optical lens according to an embodiment may include a bottom surface; a recess convex upward in a center region of the bottom surface; an incident surface around the recess; a first light exit surface disposed opposite to the bottom surface and the incident surface and having a curved surface in which a center region corresponding to the recess is convex; and a second light exit surface connected in a vertical direction between the first light exit surface and the bottom surface, wherein the recess has a bottom width in the first axial direction and a bottom width in the second axial direction.

Description

Optical lens, light emitting module and light unit having the same

The present invention relates to an optical lens, a light emitting module, and a light unit having the same.

A light emitting device, for example, a light emitting diode (Light Emitting Diode) is a type of semiconductor device that converts electrical energy into light, and is in the limelight as a next-generation light source replacing conventional fluorescent lamps and incandescent lamps.

Since light emitting diodes use semiconductor devices to generate light, they consume very little power compared to incandescent lamps that generate light by heating tungsten or fluorescent lamps that generate light by colliding ultraviolet rays generated through high-voltage discharge with phosphors. .

In addition, since the light emitting diode generates light using a potential gap of a semiconductor device, it has a longer lifespan, faster response characteristics, and eco-friendly characteristics than conventional light sources.

Accordingly, many studies are being conducted to replace existing light sources with light emitting diodes, and light emitting diodes are increasingly used as light sources for lighting devices such as various lamps used indoors and outdoors, display devices, electronic signboards, and street lights.

An embodiment provides an optical lens having light exit surfaces having different lengths in different axial directions.

An embodiment provides an optical lens having an incident surface and a light exit surface having different axial lengths.

An embodiment provides an optical lens having an asymmetrically shaped recess and an entrance surface.

The embodiment provides an optical lens in which the apexes of light exit surfaces having different lengths in the axial direction are flat or convex.

An embodiment provides an optical lens having a curved first light exit surface and a flat second light exit surface around an incident surface.

The embodiment provides an optical lens in which the apex of the incident surface is closer to the vertex of the first light exit surface than the bottom of the incident surface.

The embodiment provides an optical lens in which an inclined bottom surface is disposed around a light emitting device.

The embodiment provides an optical lens that changes an emission angle of light incident from a light emitting device that emits light on at least five sides.

The embodiment provides a light emitting module capable of injecting light emitted from the top and side surfaces of the light emitting device to the incident surface of an optical lens.

The embodiment provides a light emitting module capable of controlling luminance distribution by changing emission angles of light emitted from different emission surfaces of optical lenses.

The embodiment provides a light emitting module capable of preventing loss of light since the bottom surface of the optical lens is disposed around the light emitting device.

The embodiment provides a light emitting module in which luminance distribution in the center is improved by arranging the bottom surface of an optical lens as an inclined surface or a curved surface.

The embodiment provides an optical lens capable of controlling the luminance distribution of emitted light and a light emitting module having the same.

The embodiment provides a light emitting module in which the side protrusion of the optical lens protrudes outward from the exit surface of the optical lens.

An optical lens according to an embodiment includes a bottom surface; a recess convex upward in a center region of the bottom surface; an incident surface around the recess; a first light exit surface disposed opposite to the bottom surface and the incident surface and having a curved surface in which a center region corresponding to the recess is convex; and a second light exit surface connected in a vertical direction between the first light exit surface and the bottom surface, wherein the recess has a bottom width in the first axial direction and a bottom width in the second axial direction.

A light emitting module or light unit having an optical lens according to an embodiment may be included.

The embodiment may provide optical lenses having different luminance distributions in different axial directions.

The embodiment may reduce the number of optical lenses.

The embodiment may reduce noise such as hot spots caused by light extracted from an optical lens.

The embodiment may reduce interference between optical lenses disposed on a circuit board.

According to the embodiment, the number of light emitting devices and optical lenses disposed in the backlight unit may be reduced.

The embodiment may improve reliability of a light emitting module and a light unit having an optical lens.

According to the embodiment, an image may be improved by minimizing interference between adjacent optical lenses.

The embodiment may improve reliability of a lighting system having a light emitting module.

1 is a planar cross-sectional view of an optical lens according to a first embodiment.
Figure 2 is a rear view of the optical lens of Figure 1;
3 is a first side view of the optical lens of FIG. 1;
4 is a second side view of the optical lens of FIG. 1;
5 is an AA-side cross-sectional view of the optical lens of FIG. 1;
6 is a BB-side cross-sectional view of the optical lens of FIG. 1;
7 is a rear view of an optical lens according to a second embodiment.
FIG. 8 is a CC-side cross-sectional view of the optical lens of FIG. 7 .
Fig. 9 is a DD side cross-sectional view of the optical lens of Fig. 7;
10 is a side cross-sectional view of an optical lens according to a third embodiment.
FIG. 11 is another cross-sectional view of the optical lens of FIG. 10 .
12 is a perspective view of an optical lens according to a fourth embodiment.
13 is a side view of the optical lens of FIG. 12;
14 is a cross-sectional view of the FF side of the optical lens of FIG. 12;
15 is a cross-sectional view of the optical lens of FIG. 12 from the EE side.
16 is a view illustrating a light emitting module having an optical lens according to an embodiment.
17 is a GG-side cross-sectional view of the light emitting module of FIG. 16;
18 is an HH-side cross-sectional view of the light emitting module of FIG. 16 .
FIG. 19 is a plan view illustrating a light unit having the light emitting module of FIG. 16 .
20 is a view showing an example of a light emitting element disposed in a recess of an optical lens according to an embodiment.
21 is a view showing another example of a light emitting element disposed in a recess of an optical lens according to an embodiment.
22 is a view showing an example of a side protrusion of an optical lens according to an embodiment.
23 is a view showing another example of a side protrusion of an optical lens according to an embodiment.
24 is an example of a combined side cross-sectional view of an optical lens and a support plate according to a fifth embodiment.
25 is a first example showing a detailed configuration of a light emitting device according to an embodiment.
26 is a second example of a light emitting device according to the embodiment.
27 is a view showing a third example of a light emitting device according to the embodiment.
28 (A) and (B) are diagrams comparing luminance distributions of optical lenses according to Comparative Example and Example.
29 (A) (B) are views comparing radiation patterns of optical lenses according to Comparative Example and Example.
FIG. 30 is a graph showing the luminance distribution in the XX′-axis direction of FIG. 28 (A) (B).
FIG. 31 is a graph showing luminance distribution in the Y-Y' axis direction of FIG. 28 (A) (B).
32 is a view comparing the luminous intensity of the optical lens according to the embodiment in the X-X' and Y-Y'-axis directions with the luminous intensity of the comparative example.
33(A)(B)(C) are diagrams showing luminance distribution and luminous intensity in each axis direction in the light emitting module having the optical lens according to the second embodiment.
FIG. 34 is a diagram showing luminance distribution and luminous intensity in each axial direction in the light unit having the optical lens of FIG. 33 .
35(A)(B)(C) are diagrams showing luminance distribution and luminous intensity in each axis direction in the light emitting module having the optical lens according to the third embodiment.
FIG. 36 is a diagram showing luminance distribution and luminous intensity in each axis direction in the light unit having the optical lens of FIG. 35 .

Hereinafter, embodiments will be clearly revealed through the accompanying drawings and description of the embodiments. In the description of the embodiments, each layer (film), region, pattern or structure may be "on" or "under/under" the substrate, each layer (film), region, pad or pattern. In the case of being described as being formed on ", both "on/on" and "under/under" are formed "directly" or "indirectly" through another layer. include In addition, the criterion for the upper/upper or lower/lower of each layer will be described based on the drawings.

Hereinafter, an optical lens and a light emitting module including the optical lens according to embodiments will be described with reference to the accompanying drawings.

1 is a planar cross-sectional view of an optical lens according to a first embodiment, FIG. 2 is a rear view of the optical lens of FIG. 1, FIG. 3 is a first side view of the optical lens of FIG. 1, and FIG. 4 is an optical lens of FIG. A second side view of the lens, FIG. 5 is an A-A side cross-sectional view of the optical lens of FIG. 1, and FIG. 6 is a B-B side cross-sectional view of the optical lens of FIG.

1 to 5, the optical lens 300 includes a bottom surface 310, a recess 315 convex upward from the bottom surface 310 in the center region of the bottom surface 310, An incident surface 320 around the recess 315, a first light exit surface 330 disposed opposite to the bottom surface 310 and the incident surface 320, and the first light exit surface ( 330) and a second light exit surface 335 disposed below.

In the optical lens 300 , an axial direction perpendicular to the bottom center P0 of the recess 315 may be defined as a central axis Z0 or an optical axis. Two axis directions parallel to the bottom center P0 of the recess 315 may be the first axis X0 and the second axis Y0 directions, and the first axis X0 and the second axis ( The Y0) direction may be two axis directions orthogonal to the central axis Z0 or the optical axis. The bottom center P0 of the recess 315 may be the bottom center of the optical lens 300 and may be defined as a reference point.

The optical lens 300 may include a light-transmissive material. The optical lens 300 may include at least one of polycarbonate (PC), polymethyl methacrylate (PMMA), silicone or epoxy resin, or glass. The optical lens 300 may include a transparent material having a refractive index ranging from 1.4 to 1.7.

The bottom surface 310 of the optical lens 300 according to the embodiment may be disposed around the recess 315 . The bottom surface 310 may include an inclined surface with respect to the first horizontal axis X0, a curved surface, or both an inclined surface and a curved surface. The bottom surface 310 may have a flat area adjacent to the recess 315 and an inclined surface adjacent to the second light exit surface 335 . The recess 315 has a shape depressed in a vertical upward direction from the center area of the bottom surface 310 .

The bottom surface 310 of the optical lens 300 includes a first edge 23 adjacent to the recess 315 and a second edge 25 adjacent to the second light exit surface 335 . The first edge 23 is a boundary area between the incident surface 320 and the bottom surface 310 and may include a low point area of the optical lens 300 . The first edge 23 may include the lowest point of the area of the bottom surface 310 . The position of the first edge 23 may be lower than the position of the second edge 25 based on the horizontal first axis XO. The first edge 23 may cover the lower circumference of the incident surface 320 . The second edge 25 may be an outer area of the bottom surface 310 or a lower area of the second light exit surface 335 . The second edge 25 may be a boundary area between the bottom surface 310 and the second light exit surface 335 .

The first edge 23 may be an inner region of the bottom surface 310 or a boundary line with the incident surface 320 . The second edge 25 may be an outer region of the bottom surface 310 or a boundary line with the second light exit surface 335 . The first edge 23 may include an inner corner or a curved surface. The second edge 25 may include an outer corner or a curved surface. The first edge 23 and the second edge 25 may be both ends of the bottom surface 310 . The first edge 23 may have a circular or elliptical shape in a bottom view, and the second edge 25 may have a circular or elliptical shape in a bottom view.

As the bottom surface 310 is closer to the first edge 23, the distance between the first axis X0 and the second axis Y0 may gradually decrease. The distance between the first axis X0 and the second axis Y0 of the bottom surface 310 may gradually increase as the distance from the first edge 23 increases. On the bottom surface 310, the second edge 25 has a maximum distance from the first axis X0 and the second axis Y0, and the first edge 23 has the first axis X0. ) and the second axis Y0 may be minimal. The bottom surface 310 may include an inclined surface or a curved surface between the first edge 23 and the second edge 25 or may include both an inclined surface and a curved surface. The bottom surface 310 may become a total reflection surface when viewed from the recess 315 as the bottom surface 310 gradually becomes farther outward with reference to the first axis X0 and the second axis Y0. For example, when an arbitrary light source is disposed on the bottom of the recess 315 within the recess 315, the bottom surface 310 may provide an inclined surface. Since the bottom surface 310 reflects light incident through the recess 315, loss of light can be reduced. In addition, light directly incident to the bottom surface 310 without passing through the incident surface 320 may be removed. The optical lens 300 can increase the amount of light incident on the reflective surface 310 through the incident surface 320 and improve the beam angle distribution.

Since the bottom surface 310 becomes lower as it approaches the first edge 23 of the recess 315, it can gradually approach the first axis X0 and the second axis Y0. Accordingly, the area of the bottom surface 310 may be increased. An area of the incident surface 320 of the recess 315 may be wider as the bottom surface 310 is lowered. Since the depth of the recess 315 becomes the height from the first edge 23, it may be deeper. By increasing the area of the bottom surface 310, the reflection area can be increased. Since the bottom of the recess 315 is lowered, the bottom area can be increased.

The first edge 23 of the bottom surface 310 is disposed on the first axis X0 and the second axis Y0 parallel to the bottom of the recess 315, and the second edge 25 is spaced apart from the first axis (X0) and the second axis (Y0) at a predetermined interval. The distance between the second edge 25 and the first axis X0 or the second axis Y0 may provide an inclined surface to reflect light incident to the lower region 22 of the incident face 320. may be a distance. The lower area 22 of the incident surface 320 may be an area between the first edge 23 and a lower point of the incident surface 320 where a line horizontal to the second edge 25 intersects.

The distance between the second edge 25 and the first axis X0 or the second axis Y0 may be 500 μm or less, for example, 450 μm or less. The distance between the second edge 25 and the first axis X0 or the second axis Y0 may be in the range of 200 μm to 450 μm, and when the distance is smaller than the range, the second light exit surface ( 335) is lowered, causing an interference problem of lights emitted to the second light exit surface 335. There is a problem that the curvature of the light exit surface 330 is changed and the thickness D5 of the optical lens 300 is increased.

The bottom surface 310 may be formed as a curved surface having a Bezier curve. The curve of the bottom surface 310 may be implemented as a spline, for example, cubic, B-spline, or T-spline. The curve of the bottom surface 310 may be implemented as a Bezier curve.

The bottom surface 310 of the optical lens 300 may include a plurality of support protrusions 350 . The plurality of support protrusions 350 protrude downward from the bottom surface 310 of the optical lens 300 and support the optical lens 300 . Referring to FIG. 2 , the plurality of support protrusions 350 may be disposed at the same distance D11 from the center of the recess 315 . As another example, at least one of the plurality of support protrusions 350 may be disposed at different distances from the center of the recess 315 . The distance D13 of the plurality of support protrusions 350 in the first axis (X) direction may be smaller than the distance D12 in the second axis (Y) direction.

The bottom view shape of the bottom surface 310 may include an elliptical shape. The length of the bottom surface 310 may be different from a first length D1 in the first axis (X) direction and a second length D2 in the second axis (Y) direction. The first length D1 is the length of the first light exit surface 330 in the first axis (X) direction, and the second length D2 is the second axis (Y) of the second light exit surface 330. It can be the length of a direction. The first length D1 may be the length of the optical lens 300 in the first axis (X) direction, and the second length D2 may be the length in the second axis (Y) direction. The first length D1 may be longer than the second length D2, and the first length D1 may be greater than the second length D2 by 0.5 mm or more, for example, by 1 mm or more. The length satisfies the condition of D2 < D1, and the ratio of the length ratio (D2:D1) may be in the range of 1:1.03 to 1:1.1. In the optical lens 300 according to the embodiment, since the first length D1 is longer than the second length D2, the luminance distribution in the first axis X direction may not be reduced.

As shown in FIG. 2 , the bottom shape of the recess 315 may include an elliptical shape. As shown in FIGS. 3 to 6 , the side cross-section of the recess 315 may include a bell shape, a shell shape, or an elliptical shape. The recess 315 may have a shape in which a width gradually decreases as it goes up. The recess 315 may have a shape gradually converging from the first edge 23 around the bottom toward the first vertex 21 at the top. When the bottom view of the recess 315 has an elliptical shape, the diameter may gradually decrease toward the first apex 21 . The recess 315 may be provided in an axially symmetrical shape with respect to the central axis Z0. The first vertex 21 of the incident surface 320 may be provided in a dot shape.

Bottom widths D3 and D4 of the recess 315 may have a width into which a light source, that is, a light emitting device to be described later may be inserted. The bottom widths D3 and D4 of the recess 315 may be less than three times the width of the light emitting device, for example, less than 2.5 times. The bottom widths D3 and D4 of the recess 315 may range from 1.2 times to 2.5 times the width of the light emitting device. If it is smaller than the above range, it is not easy to insert the light emitting device. Light loss or light interference may be given through an area between the light emitting element and the first edge 23 .

Looking at the width of the bottom of the recess 315, the width D3 in the direction of the first axis (X) may be different from the width D4 in the direction of the second axis (Y). For example, the width D3 in the direction of the first axis (X) may be smaller than the width D4 in the direction of the second axis. The bottom width of the recess 315 satisfies the condition of D3<D4, and the difference may be between 0.5 mm and 5 mm, for example between 1 mm and 2 mm. The width D4 may be 4 times or less of D3, for example, 2 times or less. The ratio (D3:D4) of the bottom width of the recess 315 may have a difference in the range of 1:1.3 to 1:2. When the width D4 in the second axis (Y) direction is smaller than the range D3 in the first axis (X) direction, the luminance improvement in the Y-axis direction is insignificant and is larger than the range in the X-axis direction. The luminance distribution of may be relatively small.

In the optical lens 300 according to the embodiment, the first length D1 in the first axis (X) direction is longer than the second length D2 in the second axis (Y) direction, and the recess 315 ), the width D3 in the first axis (X) direction may be narrower than the width D4 in the second axis (Y) direction. Accordingly, the optical lens 300 can secure the luminance distribution in the second axis (Y) direction due to the external length difference, and in terms of the luminance distribution, the recess 315 can secure the first axis (X) direction and It can be widely spread to the corner area.

The number of bars of the light emitting module in which the optical lens 300 is arranged may be reduced to two or less, for example, to one, and the luminance distribution of the upper and lower corners of the backlight unit may be improved.

The incident surface 320 has a convex curved surface upward from the center region of the bottom surface 310 and may be a circumferential surface or an inner surface of the recess 315 . The incident surface 320 may gradually become farther away as the distance from the center of the bottom P0 of the recess 315 increases. Since the incident surface 320 is provided as a convex curved surface, it can refract light in the entire area. The lower region 22 of the incident surface 320 is disposed at a position lower than the second light exit surface 335, and may directly or indirectly receive light. The lower region 22 of the incident surface 320 may receive light reflected from the bottom of the recess 315 . The incident surface 320 may be formed as a rotating body having a Bezier curve. The curve of the incident surface 320 may be implemented as a spline, for example, cubic, B-spline, or T-spline. The curve of the incident surface 320 may be implemented as a Bezier curve.

As shown in FIGS. 5 and 6 , the optical lens 300 includes a first light exit surface 330 and a second light exit surface 335 . The first light exit surface 330 may be a surface opposite to the incident surface 320 and the bottom surface 310 based on the lens body. The first light exit surface 330 includes a curved surface. A point corresponding to the central axis Z0 of the first light exit surface 330 may be the second apex 31 , and the second apex 31 may be the apex of the lens body. The first light exit surface 330 may include an upwardly convex curved surface. The entire area of the first light exit surface 330 may be formed as a curved surface, for example, a curved surface having different amounts of curvature. The first light exit surface 330 may have an axisymmetric shape with respect to the central axis Z0 , for example, a first axis (X) or second axis (Y) symmetrical shape. The center-side first regions A1 and A2 adjacent to the second vertex 31 of the second light exit surface 335 may not have a negative curvature. The first regions A1 and A2 adjacent to the second vertex 31 on the second light exit surface 335 may have different positive radii of curvature. The second areas A3 and A4, which are outer side areas of the first areas A1 and A2, may be formed as curved surfaces having different radii of curvature.

The first light exit surface 330 may gradually increase as the distance from the center of the bottom P0 of the recess 315 increases from the central axis Z0. The first light exit surface 330 may have no inclination or a slight difference in inclination with respect to a horizontal axis as it is closer to the central axis Z0 , that is, the second apex 31 . That is, the center-side first areas A1 and A2 of the first light exit surface 330 may include a gentle curve or a flat straight line. The first areas A1 and A2 of the first light exit surface 330 may include areas vertically overlapping the recess 315 . The side-side second areas A3 and A4 of the first light exit surface 330 may have a steeper curved surface than the first areas A1 and A2. Since the first light exit surface 330 and the incident surface 320 have convex curved surfaces, light emitted from the bottom center P0 of the recess 315 can be diffused laterally. The angle at which light is refracted may increase as the distance between the first light exit surface 330 and the incident surface 320 from the central axis Z0 is within an angular range of 70 ± 4 from the central axis Z0. there is.

The radius of curvature of the first areas A1 and A2 of the first light exit surface 330 may be greater than the radius of curvature of the incident surface 320 . The radius of curvature of the first areas A1 and A2 of the first light exit surface 330 may be greater than the radius of curvature of the second areas A3 and A4. The first regions A1 and A2 in the first axis (X) direction and the second axis (Y) direction may have the same or different curvature radii, but are not limited thereto. The second regions A3 and A4 in the first axis (X) direction and the second axis (Y) direction may have the same or different curvature radii, but are not limited thereto.

The slope of the first light exit surface 330 may be smaller than the slope of the incident surface 320 . The monotony of the first light exit surface 330 of the optical lens 300 increases as the distance increases with respect to the central axis Z0 within the beam angle, and the second light exit surface 335 has a It includes an area out of the beam angle distribution, and the monotonicity becomes the same or decreases as the distance increases with respect to the central axis Z0.

In the boundary region between the first light exit surface 330 and the second light exit surface 335, an angle at which light is refracted may decrease, for example, to an angle range of 2 degrees or less. Since a surface of the first light exit surface 330 close to the second light exit surface 335 may be provided as a tangential or perpendicular surface, the angle at which light is refracted may gradually decrease.

The second light exit surface 335 of the optical lens 300 may be disposed at a position higher than the first axis X0 and the second axis Y0 that are horizontal to the bottom of the recess 315 . The second light exit surface 335 may be a flat surface or an inclined surface, and may be defined as a flange, but is not limited thereto.

The second light exit surface 335 may be disposed perpendicular to or inclined to the horizontal first and second axes X0 and Y0. The second light exit surface 335 may extend vertically or obliquely from the outer line of the first light exit surface 330 . The second light exit surface 335 includes a third edge 35 adjacent to the first light exit surface 330, and the third edge 35 is an outer line of the first light exit surface 330. It may be located at the same position as or located inside or outside the outer line of the first light exit surface 330 .

A straight line connecting the third edge 35 of the second light exit surface 335 and the central axis Z0 is 74 degrees from the central axis Z0 with respect to the bottom center P0 of the recess 315. It can be positioned at an angle of less than ±2 degrees. The third edge 35 of the second light exit surface 335 is about the horizontal first axis X0 and the second axis YO based on the bottom center P0 of the recess 315. It may be positioned at an angle of less than 20 degrees, for example, 16±2 degrees. The angle between the second edge 25 and the third edge 35 of the second light exit surface 335 with the bottom center P0 of the recess 315 is 16 degrees or less, for example, an angle of 13±2 degrees. can have An angle of the second light exit surface 335 to a straight line passing through the third edge 35 is an external angle of the optical lens 300 . The second light exit surface 335 may refract and emit incident light in an area spaced apart from the horizontal first axis X0 and the second axis YO. The light refracted by the second light exit surface 335 may be emitted at an angle smaller than the angle before refraction with respect to the central axis Z0 . Accordingly, the second light exit surface 335 can suppress refracted light from being emitted in a horizontal axis or a direction lower than the horizontal axis, and can prevent interference with adjacent optical members or loss of light.

A straight line passing through the central axis Z0 and the second edge 25 of the bottom surface 310 has an angle θ1 of 5 degrees or less with the first axis X0 or the second axis YO. It may range from 0.4 degrees to 4 degrees. This angle θ1 may vary depending on the distance from the central axis Z0 and the height of the second edge 25, and if it is out of the range, the thickness of the optical lens may change and loss of light may increase. can Since the second light exit surface 335 refracts light that deviate from the half-intensity angle from the central axis Z0 based on the bottom center P0 of the recess 315, light loss can be reduced. .

The lengths D1 and D2 of the optical lens 300 may be greater than the thickness D5. The lengths D1 and D2 of the optical lens 300 may be 2.5 times or more, for example, 3 times or more the thickness D5. Among the lengths of the optical lens 300, the first length D1 may be 15 mm or more, for example, in the range of 16 mm to 25 mm, and the second length D2 may be 16 mm or more, for example, in the range of 17 mm to 30 mm. The thickness D5 of the optical lens 300 may be 6.5 mm or more, for example, 6.5 mm to 9 mm or less. Since the different lengths D1 and D2 of the optical lens 300 are larger than the thickness D5, a uniform luminance distribution can be provided over the entire area of the lighting device or light unit. In addition, since the area covered in the light unit is improved, the number of optical lenses can be reduced and the thickness of the optical lens 300 can be reduced.

The depth D8 of the recess 315 has a distance from the bottom center P0 to the first vertex 21 . Here, the first vertex 21 may be a vertex of the incident surface 320 or an upper end of the recess 315 . The depth D8 of the recess 315 may be 5 mm or more, for example, 6 mm or more, and may have a depth of 75% or more, for example, 80% or more of the thickness D5 of the optical lens 300 . The depth D8 of the recess 315 may be 80% or more of the distance between the second apex 31 of the first light exit surface 330 and the center of the bottom P0 or the first edge 23. . Since the depth D8 of the recess 315 is deep, even if the center region of the first light exit surface 330 does not have a total reflection surface or negative curvature, the first vertex 21 of the incident surface 320 ), the light can be diffused in the lateral direction even in the adjacent area. Since the recess 315 has a deep depth D8, the incident surface 320 transmits light incident from an area close to the second vertex 31 to a peripheral area of the first vertex 21 in a lateral direction. can be refracted.

The minimum distance D9 between the recess 315 and the first light exit surface 330 is the first vertex 21 of the incident surface 320 and the second vertex of the first light exit surface 330. (31) may be the interval between. The distance D9 may be 3 mm or less, for example, in a range of 0.6 mm to 3 mm or 0.6 mm to 2 mm. When the distance D9 between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first light exit surface 330 is 3 mm or more, the first vertex 21 of the first light exit surface 330 A difference in the amount of light traveling between the regions A1 and A2 and the second regions A3 and A4 may increase, and light distribution may not be uniform. When the distance D9 between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first light exit surface 330 is less than 0.6 mm, the stiffness of the center side of the optical lens 300 is There is a problem with weakening. By arranging the distance D9 between the recess 315 and the first light exit surface 330 within the above range, the first areas A1 and A2 of the second light exit surface 335 are either total reflection surfaces or Even without negative curvature, the path of light can be diffused outward. This is because the closer the first vertex 21 of the incident surface 320 is to the convex second vertex 31 of the first light exit surface 330, the first light exit surface 330 through the incident surface 320. A light amount of light traveling in a lateral direction of may be increased. Therefore, the amount of light diffused in the lateral direction of the optical lens 300 can be increased.

The first vertex 21 of the incident surface 320 is the center of the second light exit surface 335 rather than a straight line extending horizontally from the third edge 35 of the second light exit surface 335. It may be placed closer to the apex 31 .

The width D7 of the second light exit surface 335 is a linear distance between the second edge 25 and the third edge 35 and may be smaller than the depth D8 of the recess 315 . The width D7 of the second light exit surface 335 may be, for example, in the range of 1.8 mm to 2.3 mm. When the width D7 of the second light exit surface 335 exceeds the above range, the amount of light emitted from the second light exit surface 335 increases, making it difficult to control the light distribution. When manufacturing a lens body, it may be difficult to secure a gate area.

As shown in FIGS. 5 and 6 , the first areas A1 and A2 of the first light exit surface 330 vertically overlap the recess 315 and are based on the center of the floor P0. It may be positioned at an angle of 20 degrees or less from the central axis Z0, for example, in an area of 14 degrees to 18 degrees. When the first areas A1 and A2 of the first light exit surface 330 exceed the angular range, the radius within the recess 315 becomes larger, and the first areas A1 and A2 There is a problem in that the difference between the amount of light between the second areas A3 and A4 increases. In addition, when the first regions A1 and A2 of the first light exit surface 330 are smaller than the angular range, the radius within the recess 315 is further reduced, making it difficult to insert the light source, and the first light exits. Light distribution in the first areas A1 and A2 and the second areas A3 and A4 of the surface 330 may not be uniform.

In the optical lens 300, the second light exit surface 335 is disposed around the lower circumference of the first light exit surface 330, and the bottom surface 310 is the second edge of the second light exit surface 335. It can be placed below (25). The bottom surface 310 may protrude below the horizontal line of the second edge 25 of the second light exit surface 335 .

As another example, the optical lens 300 may have a concave-convex surface on the second light exit surface 335 . The uneven surface may be formed of a haze surface having a rough surface. The uneven surface may be a surface on which scattering particles are formed. As another example, the optical lens 300 may have a concave-convex surface on the bottom surface 310 . The concavo-convex surface of the bottom surface 310 may be formed as a haze surface having a rough surface or scattering particles may be formed.

As shown in FIG. 16 , the optical lenses 300 according to the embodiment may be arranged at predetermined intervals in the second axis (Y) direction on the circuit board 400 . As shown in FIGS. 2, 5, and 6, since the optical lenses 300 are arranged in the direction of the second axis Y where the width of the recess 315 (D4>D3) is wide, the distance between the optical lenses 300 is It is possible to reduce the number of optical lenses 300 while widening , and the luminance distribution in the first axis (X) direction can be improved by the asymmetric structure of the recess 315 .

7 is a rear view of an optical lens according to a second embodiment, FIG. 8 is a C-C side cross-sectional view of the optical lens of FIG. 7, and FIG. 9 is a D-D side cross-sectional view of the optical lens of FIG. In describing the first embodiment, the description of the same parts as the first embodiment will be omitted.

Referring to FIGS. 7 to 9 , the optical lens according to the second embodiment includes a bottom surface 310 and a recess convex upward from the bottom surface 310 in a center region of the bottom surface 310 ( 315), an incident surface 320 around the recess 315, a first light exit surface 330 disposed opposite to the bottom surface 310 and the incident surface 320, and the first light A second light exit surface 335 disposed below the exit surface 330 is included. Compared to the optical lens of the first embodiment, the optical lens according to the second embodiment has first and second lengths D1 and D2, widths D3 and D4 of the recess 315, and recess 315. It is a structure with different depths.

The bottom surface 310 of the optical lens 300 may include a plurality of support protrusions 350 . The plurality of support protrusions 350 protrude downward from the bottom surface 310 of the optical lens 300 and support the optical lens 300 .

The bottom view shape of the bottom surface 310 may include an elliptical shape. The length of the bottom surface 310 or the first light exit surface 330 is different from the first length D1 in the first axis (X) direction and the second length D2 in the second axis (Y) direction. can The first length D1 may be the length of the optical lens 300 in the first axis (X) direction, and the second length D2 may be the length in the second axis (Y) direction. The first length D1 may be longer than the second length D2, and the first length D1 may be greater than the second length D2 by 0.5 mm or more, for example, by 1 mm or more. The length satisfies the condition of D2 < D1, and the ratio of the length ratio (D2:D1) may be in the range of 1:1.03 to 1:1.1. In the optical lens 300 according to the embodiment, since the first length D1 is longer than the second length D2, the luminance distribution in the first axis X direction may not be reduced.

As shown in FIG. 7 , the bottom shape of the recess 315 may include an elliptical shape. As shown in FIGS. 8 and 9 , the side cross-section of the recess 315 may include a bell shape, a shell shape, or an elliptical shape. The recess 315 may have a shape in which a width gradually decreases as it goes up. The recess 315 may have a shape gradually converging from the first edge 23 around the bottom toward the first vertex 21 at the top. When the bottom view of the recess 315 has an elliptical shape, the diameter may gradually decrease toward the first apex 21 . The recess 315 may be provided in an axially symmetrical shape with respect to the central axis Z0. The first vertex 21 of the incident surface 320 may be provided in a dot shape.

Bottom widths D3 and D4 of the recess 315 may have a width into which a light source, that is, a light emitting device to be described later may be inserted. The bottom widths D3 and D4 of the recess 315 may be less than three times the width of the light emitting device, for example, less than 2.5 times. The bottom widths D3 and D4 of the recess 315 may range from 1.2 times to 2.5 times the width of the light emitting device. If it is smaller than the above range, it is not easy to insert the light emitting device. Light loss or light interference may be given through an area between the light emitting element and the first edge 23 .

Looking at the width of the bottom of the recess 315, the width D3 in the direction of the first axis (X) may be different from the width D4 in the direction of the second axis (Y). For example, the width D3 in the direction of the first axis (X) may be smaller than the width D4 in the direction of the second axis. The bottom width of the recess 315 satisfies the condition of D3<D4, and the difference may be between 2 mm and 5 mm, for example between 3 mm and 5 mm. The width D4 may be 4 times or less than D3. The bottom width ratio (D3:D4) of the recess 315 may have a difference in the range of 1:1.5 to 1:3. When the width D4 in the second axis (Y) direction is smaller than the range D3 in the first axis (X) direction, the luminance improvement in the Y-axis direction is insignificant and is larger than the range in the X-axis direction. The luminance distribution of may be relatively small. In addition, since the width difference between the bottom widths D3 and D4 of the recess 315 is increased, the light extraction efficiency of the light emitted from the light source, for example, a light emitting device, in a direction in which the width of the recess is wide, for example, the Y-axis direction, is improved. can induce

In the optical lens 300 according to the embodiment, the first length D1 in the first axis (X) direction is longer than the second length D2 in the second axis (Y) direction, and the recess 315 ), the width D3 in the first axis (X) direction may be narrower than the width D4 in the second axis (Y) direction. Accordingly, the optical lens 300 can secure the luminance distribution in the second axis (Y) direction due to the external length difference, and in terms of the luminance distribution, the recess 315 can secure the first axis (X) direction and It can be widely spread to the corner area.

The number of bars of the light emitting module in which the optical lens 300 is arranged may be reduced to two or less, for example, to one, and the luminance distribution of the upper and lower corners of the backlight unit may be improved.

The second light exit surface 335 of the optical lens 300 may be disposed at a position higher than the first axis X0 and the second axis Y0 that are horizontal to the bottom of the recess 315 . The second light exit surface 335 may be a flat surface or an inclined surface, and may be defined as a flange, but is not limited thereto.

The second light exit surface 335 may be disposed perpendicular to or inclined to the horizontal first and second axes X0 and Y0. The second light exit surface 335 may extend vertically or obliquely from the outer line of the first light exit surface 330 . The second light exit surface 335 includes a third edge 35 adjacent to the first light exit surface 330, and the third edge 35 is an outer line of the first light exit surface 330. It may be located at the same position as or located inside or outside the outer line of the first light exit surface 330 .

A straight line connecting the third edge 35 of the second light exit surface 335 and the central axis Z0 is 74 degrees from the central axis Z0 with respect to the bottom center P0 of the recess 315. It can be positioned at an angle of less than ±2 degrees. The third edge 35 of the second light exit surface 335 is about the horizontal first axis X0 and the second axis YO based on the bottom center P0 of the recess 315. It may be positioned at an angle of less than 20 degrees, for example, 16±2 degrees. The angle between the second edge 25 and the third edge 35 of the second light exit surface 335 with the bottom center P0 of the recess 315 is 16 degrees or less, for example, an angle of 13±2 degrees. can have An angle of the second light exit surface 335 to a straight line passing through the third edge 35 is an external angle of the optical lens 300 . The second light exit surface 335 may refract and emit incident light in an area spaced apart from the horizontal first axis X0 and the second axis YO. The light refracted by the second light exit surface 335 may be emitted at an angle smaller than the angle before refraction with respect to the central axis Z0 . Accordingly, the second light exit surface 335 can suppress refracted light from being emitted in a horizontal axis or a direction lower than the horizontal axis, and can prevent interference with adjacent optical members or loss of light.

A straight line passing through the central axis Z0 and the second edge 25 of the bottom surface 310 has an angle θ1 of 5 degrees or less with the first axis X0 or the second axis YO. It may range from 0.4 degrees to 4 degrees. This angle θ1 may vary depending on the distance from the central axis Z0 and the height of the second edge 25, and if it is out of the range, the thickness of the optical lens may change and loss of light may increase. can Since the second light exit surface 335 refracts light that deviate from the half-intensity angle from the central axis Z0 based on the bottom center P0 of the recess 315, light loss can be reduced. .

The lengths D1 and D2 of the optical lens 300 may be greater than the thickness D5. The lengths D1 and D2 of the optical lens 300 may be 2.5 times or more, for example, 3 times or more the thickness D5. Among the lengths of the optical lens 300, the first length D1 may be 15 mm or more, for example, in the range of 16 mm to 25 mm, and the second length D2 may be 16 mm or more, for example, in the range of 17 mm to 30 mm. The thickness D5 of the optical lens 300 may be 6.5 mm or more, for example, 6.5 mm to 9 mm or less. Since the different lengths D1 and D2 of the optical lens 300 are larger than the thickness D5, a uniform luminance distribution can be provided over the entire area of the lighting device or light unit. In addition, since the area covered in the light unit is improved, the number of optical lenses can be reduced and the thickness of the optical lens 300 can be reduced.

The depth D8 of the recess 315 has a distance from the bottom center P0 to the first vertex 21 . Here, the first vertex 21 may be a vertex of the incident surface 320 or an upper end of the recess 315 . The depth D8 of the recess 315 may be 5 mm or more, for example, 6 mm or more, and may have a depth of 75% or more, for example, 80% or more of the thickness D5 of the optical lens 300 . The depth D8 of the recess 315 may be 80% or more of the distance between the second apex 31 of the first light exit surface 330 and the center of the bottom P0 or the first edge 23. . Since the depth D8 of the recess 315 is deep, even if the center region of the first light exit surface 330 does not have a total reflection surface or negative curvature, the first vertex 21 of the incident surface 320 ), the light can be diffused in the lateral direction even in the adjacent area. Since the recess 315 has a deep depth D8, the incident surface 320 transmits light incident from an area close to the second vertex 31 to a peripheral area of the first vertex 21 in a lateral direction. can be refracted.

The minimum distance D9 between the recess 315 and the first light exit surface 330 is the first vertex 21 of the incident surface 320 and the second vertex of the first light exit surface 330. (31) may be the interval between. The distance D9 may be 3 mm or less, for example, in a range of 0.6 mm to 3 mm or 0.6 mm to 2 mm. When the distance D9 between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first light exit surface 330 is 3 mm or more, the center area of the first light exit surface 330 A difference in the amount of light traveling to and from the side area may increase, and light distribution may not be uniform. When the distance D9 between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first light exit surface 330 is less than 0.6 mm, the stiffness of the center side of the optical lens 300 is There is a problem with weakening. By arranging the distance D9 between the recess 315 and the first light exit surface 330 within the above range, even if the center area of the second light exit surface 335 does not have a total reflection surface or negative curvature. , can diffuse the path of light outward. This is because the closer the first vertex 21 of the incident surface 320 is to the convex second vertex 31 of the first light exit surface 330, the first light exit surface 330 through the incident surface 320. A light amount of light traveling in a lateral direction of may be increased. Accordingly, the amount of light diffused in the lateral direction of the optical lens 300, for example, in the Y-axis direction, can be increased.

The first vertex 21 of the incident surface 320 is the center of the second light exit surface 335 rather than a straight line extending horizontally from the third edge 35 of the second light exit surface 335. It may be placed closer to the apex 31 .

The width D7 of the second light exit surface 335 is a linear distance between the second edge 25 and the third edge 35 and may be smaller than the depth D8 of the recess 315 . The width D7 of the second light exit surface 335 may be, for example, in the range of 1.8 mm to 2.3 mm. When the width D7 of the second light exit surface 335 exceeds the above range, the amount of light emitted from the second light exit surface 335 increases, making it difficult to control the light distribution. When manufacturing a lens body, it may be difficult to secure a gate area.

In the optical lens 300, the second light exit surface 335 is disposed around the lower circumference of the first light exit surface 330, and the bottom surface 310 is the second edge of the second light exit surface 335. It can be placed below (25). The bottom surface 310 may protrude below the horizontal line of the second edge 25 of the second light exit surface 335 . As another example, the optical lens 300 may have a concave-convex surface on the second light exit surface 335 . The uneven surface may be formed of a haze surface having a rough surface. The uneven surface may be a surface on which scattering particles are formed. As another example, the optical lens 300 may have a concave-convex surface on the bottom surface 310 . The concavo-convex surface of the bottom surface 310 may be formed as a haze surface having a rough surface or scattering particles may be formed.

As shown in FIG. 16 , the optical lenses 300 according to the embodiment may be arranged at predetermined intervals in the second axis (Y) direction on the circuit board 400 . As shown in FIGS. 7 to 9 , since the optical lenses 300 are arranged in the direction of the second axis Y where the width of the recesses 315 (D4>D3) is wide, the distance between the optical lenses 300 is widened. The number of optical lenses 300 can be reduced, and the luminance distribution in the first axis (X) direction can be improved by the asymmetric structure of the recess 315 .

10 is a side cross-sectional view of an optical lens according to a third embodiment, and FIG. 11 is another side cross-sectional view of the optical lens of FIG. 10 .

Referring to FIGS. 10 and 11 , the optical lens according to the third embodiment includes a bottom surface 310 and a recess convex upward from the bottom surface 310 in a center region of the bottom surface 310 ( 315), an incident surface 320 around the recess 315, a first light exit surface 330 disposed opposite to the bottom surface 310 and the incident surface 320, and the first light A second light exit surface 335 disposed below the exit surface 330 is included. Compared to the optical lens of the first embodiment, the optical lens according to the third embodiment has the first and second lengths D1 and D2, the widths D3 and D4 of the recess 315, and the recess 315. It is a structure with different depths. In addition, the optical lens according to the third embodiment may be provided in a structure in which the widths B1 and B2 of the second light exit surface 335 are different depending on the area.

The bottom view shape of the bottom surface 310 of the optical lens may include an elliptical shape. The length of the bottom surface 310 or the first light exit surface 330 is different from the first length D1 in the first axis (X) direction and the second length D2 in the second axis (Y) direction. can The first length D1 may be the length of the optical lens 300 in the first axis (X) direction, and the second length D2 may be the length in the second axis (Y) direction. The first length D1 may be longer than the second length D2, and the first length D1 has a difference of 0.5 mm or more, for example, 0.5 mm or more and 2 mm or less, from the second length D2. can The length satisfies the condition of D2 < D1, and the ratio of the length ratio (D2:D1) may be in the range of 1:1.03 to 1:1.1. In the optical lens 300 according to the embodiment, since the first length D1 is longer than the second length D2, the luminance distribution in the first axis X direction may not be reduced.

A bottom shape of the recess 315 may include an elliptical shape. The recess 315 may have a bell shape, a shell shape, or an elliptical cross section. The recess 315 may have a shape in which a width gradually decreases as it goes up. The recess 315 may have a shape gradually converging from the first edge 23 around the bottom toward the first vertex 21 at the top. When the bottom view of the recess 315 has an elliptical shape, the diameter may gradually decrease toward the first apex 21 . The recess 315 may be provided in an axially symmetrical shape with respect to the central axis Z0. The first vertex 21 of the incident surface 320 may be provided in a dot shape.

Bottom widths D3 and D4 of the recess 315 may have a width into which a light source, that is, a light emitting device to be described later may be inserted. The bottom widths D3 and D4 of the recess 315 may be less than three times the width of the light emitting device, for example, less than 2.5 times. The bottom widths D3 and D4 of the recess 315 may range from 1.2 times to 2.5 times the width of the light emitting device. If it is smaller than the above range, it is not easy to insert the light emitting device. Light loss or light interference may be given through an area between the light emitting element and the first edge 23 .

Looking at the width of the bottom of the recess 315, the width D3 in the direction of the first axis (X) may be different from the width D4 in the direction of the second axis (Y). For example, the width D3 in the direction of the first axis (X) may be smaller than the width D4 in the direction of the second axis. The bottom width of the recess 315 satisfies the condition of D3<D4, and the difference may be between 1.5 mm and 5 mm, for example between 1.5 mm and 3 mm. The width D4 may be 3 times or less of D3, for example, 2 times or less. The bottom width ratio (D3:D4) of the recess 315 may have a difference in the range of 1:1.5 to 1:3. When the width D4 in the second axis (Y) direction is smaller than the range D3 in the first axis (X) direction, the luminance improvement in the Y-axis direction is insignificant and is larger than the range in the X-axis direction. The luminance distribution of may be relatively small. In addition, even if the width difference between the bottom widths D3 and D4 of the recess 315 is not large, light emitted from a light source, for example, a light emitting device, induces improvement in light extraction efficiency in a direction in which the width of the recess is wide, for example, the Y-axis direction. can do.

In the optical lens 300 according to the embodiment, the first length D1 in the first axis (X) direction is longer than the second length D2 in the second axis (Y) direction, and the recess 315 ), the width D3 in the first axis (X) direction may be narrower than the width D4 in the second axis (Y) direction. Accordingly, the optical lens 300 can secure the luminance distribution in the second axis (Y) direction due to the external length difference, and in terms of the luminance distribution, the recess 315 can secure the first axis (X) direction and It can be widely spread to the corner area.

The number of bars of the light emitting module in which the optical lens 300 is arranged may be reduced to two or less, for example, to one, and the luminance distribution of the upper and lower corners of the backlight unit may be improved.

The second light exit surface 335 of the optical lens 300 may be disposed at a position higher than the first axis X0 and the second axis Y0 that are horizontal to the bottom of the recess 315 . The second light exit surface 335 may be a flat surface or an inclined surface, and may be defined as a flange, but is not limited thereto.

The second light exit surface 335 may be disposed perpendicular to or inclined to the horizontal first and second axes X0 and Y0. The second light exit surface 335 may extend vertically or obliquely from the outer line of the first light exit surface 330 . The second light exit surface 335 includes a third edge 35 adjacent to the first light exit surface 330, and the third edge 35 is an outer line of the first light exit surface 330. It may be located at the same position as or located inside or outside the outer line of the first light exit surface 330 .

A straight line connecting the third edge 35 of the second light exit surface 335 and the central axis Z0 is 74 degrees from the central axis Z0 with respect to the bottom center P0 of the recess 315. It can be positioned at an angle of less than ±2 degrees. The third edge 35 of the second light exit surface 335 is about the horizontal first axis X0 and the second axis YO based on the bottom center P0 of the recess 315. It may be positioned at an angle of less than 20 degrees, for example, 16±2 degrees. The angle between the second edge 25 and the third edge 35 of the second light exit surface 335 with the bottom center P0 of the recess 315 is 16 degrees or less, for example, an angle of 13±2 degrees. can have An angle of the second light exit surface 335 to a straight line passing through the third edge 35 is an external angle of the optical lens 300 . The second light exit surface 335 may refract and emit incident light in an area spaced apart from the horizontal first axis X0 and the second axis YO. The light refracted by the second light exit surface 335 may be emitted at an angle smaller than the angle before refraction with respect to the central axis Z0 . Accordingly, the second light exit surface 335 can suppress refracted light from being emitted in a horizontal axis or a direction lower than the horizontal axis, and can prevent interference with adjacent optical members or loss of light.

The angles θ1 and θ2 of a straight line passing through the central axis Z0 and the second edge 25 of the bottom surface 310 with the first axis X0 or the second axis YO are 5 degrees or less. For example, it may range from 0.4 degrees to 4 degrees. The angles θ1 and θ2 with the first axis X0 or the second axis Y0 may be the same or may have a difference of 1 degree or less. These angles θ1 and θ2 may vary depending on the distance from the central axis Z0 and the height of the second edge 25, and if they are out of the range, the thickness of the optical lens may change and light loss may occur. can be increased Since the second light exit surface 335 refracts light that deviate from the half-intensity angle from the central axis Z0 based on the bottom center P0 of the recess 315, light loss can be reduced. .

The lengths D1 and D2 of the optical lens 300 may be greater than the thickness D5. The lengths D1 and D2 of the optical lens 300 may be 2.5 times or more, for example, 3 times or more the thickness D5. Among the lengths of the optical lens 300, the first length D1 may be 15 mm or more, for example, in the range of 16 mm to 25 mm, and the second length D2 may be 16 mm or more, for example, in the range of 17 mm to 30 mm. The thickness D5 of the optical lens 300 may be 6.5 mm or more, for example, 6.5 mm to 9 mm or less. Since the different lengths D1 and D2 of the optical lens 300 are larger than the thickness D5, a uniform luminance distribution can be provided over the entire area of the lighting device or light unit. In addition, since the area covered in the light unit is improved, the number of optical lenses can be reduced and the thickness of the optical lens 300 can be reduced.

The depth D8 of the recess 315 has a distance from the bottom center P0 to the first vertex 21 . Here, the first vertex 21 may be a vertex of the incident surface 320 or an upper end of the recess 315 . The depth D8 of the recess 315 may be 3 mm or more, for example, 3.5 mm or more, and may have a depth of 55% or more, for example, 57% or more of the thickness D5 of the optical lens 300 . The depth D8 of the recess 315 may be 80% or more of the distance between the second apex 31 of the first light exit surface 330 and the center of the bottom P0 or the first edge 23. . Even if the depth D8 of the recess 315 is not deep compared to the first embodiment, when the center region of the first light exit surface 330 does not have a total reflection surface or negative curvature, the incident surface 320 Light can be diffused in the lateral direction even in an area adjacent to the first vertex 21 of ). The recess 315 may have a low depth D8 and light extraction efficiency in the Y-axis direction may be improved by a difference in width of the recess 315 .

The minimum distance D9 between the recess 315 and the first light exit surface 330 is the first vertex 21 of the incident surface 320 and the second vertex of the first light exit surface 330. (31) may be the interval between. The distance D9 may be less than 5 mm, for example, in a range of 1 mm to 3.5 mm. When the distance D9 between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first light exit surface 330 is 5 mm or more, light is extracted due to the low depth of the recess 315. Efficiency may decrease. Due to the recess 315 having the above structure, light diffusion in the second axis (Y) direction can be performed more effectively than the first axis (X) direction of the first light exit surface 330 .

The first vertex 21 of the incident surface 320 is the center of the second light exit surface 335 rather than a straight line extending horizontally from the third edge 35 of the second light exit surface 335. It may be placed closer to the apex 31 .

Widths B1 and B2 of the second light exit surface 335 are straight line distances between the second edge 25 and the third edge 35 . Looking at the widths B1 and B2 of the second light exit surface 335, the width B2 of the area close to the second edge 25 in the direction of the first horizontal axis X0 is the widest and the second axis ( The width B1 of an area close to the second edge 25 in the Y0) direction may be the narrowest. In addition, the width B2 gradually widens as it is closer to the second edge 25 in the direction of the first horizontal axis (X0), and the closer it is to the second edge 25 in the direction of the second axis (Y0), the width (B1) can gradually narrow.

Among the widths B1 and B2 of the second light exit surface 335 , a maximum width B2 may be smaller than a depth D8 of the recess 315 . Widths B1 and B2 of the second light exit surface 335 may be, for example, in the range of 1.5 mm to 2.3 mm. When the width B2 of the second light exit surface 335 exceeds the above range, the amount of light emitted from the second light exit surface 335 increases, making it difficult to control the light distribution. Here, the area having the width B2 of the second light exit surface 335 may be used as a gate area when manufacturing the lens body.

In the optical lens 300, the second light exit surface 335 is disposed around the lower circumference of the first light exit surface 330, and the bottom surface 310 is the second edge of the second light exit surface 335. It can be placed below (25). The bottom surface 310 may protrude below the horizontal line of the second edge 25 of the second light exit surface 335 . As another example, the optical lens 300 may have a concave-convex surface on the second light exit surface 335 . The uneven surface may be formed of a haze surface having a rough surface. The uneven surface may be a surface on which scattering particles are formed. As another example, the optical lens 300 may have a concave-convex surface on the bottom surface 310 . The concavo-convex surface of the bottom surface 310 may be formed as a haze surface having a rough surface or scattering particles may be formed.

As shown in FIG. 16 , the optical lenses 300 according to the embodiment may be arranged at predetermined intervals in the second axis (Y) direction on the circuit board 400 . As shown in FIGS. 10 and 11 , since the optical lenses 300 are arranged in the direction of the second axis (Y) where the width of the recess 315 (D4>D3) is wide, the distance between the optical lenses 300 is widened and The number of optical lenses 300 can be reduced, and the luminance distribution in the first axis (X) direction can be improved by the asymmetric structure of the recess 315 .

12 is a perspective view of an optical lens according to a fourth embodiment, FIG. 13 is a side view of the optical lens of FIG. 12, FIG. 14 is a F-F side cross-sectional view of the optical lens of FIG. 12, and FIG. 15 is a view of the optical lens of FIG. E-E side sectional view.

12 to 15 , the optical lens 300A according to the fourth embodiment has a bottom surface 310 and a recess convex upward from the bottom surface 310 in a center region of the bottom surface 310 ( recess 315A, an incident surface 320A around the recess 315A, first light exit surfaces 330A and 330B disposed on opposite sides of the bottom surface 310A and the incident surface 320A, and second light exit surfaces 335A and 335B disposed under the first light exit surfaces 330A and 330B.

The optical lens 300A is formed so that the first length D23 in the direction of the first axis (X) of the two axes (X, Y) passing through the center of the bottom surface 310 has a maximum value, and the second The second length D22 in the axial (Y) direction may be formed to have a minimum value. The bottom surface 310 of the optical lens 300A may have a first length D23 and a second length D22 in the directions of the first and second axes (X, Y), and the other shape is a semicircular shape. It may have a shape in which two are connected. The second light exit surfaces 335A and 335B adjacent to the bottom surface 310 may have one or more inflection points along the center side, for example, a boundary divided by two semicircular shapes. Accordingly, the bottom surface 310 may have an “8” shape or a shape in which two hemispheres overlap each other. The bottom surface 310 may include a flat inner region 312 and an inclined outer region 314, but is not limited thereto.

The recess 315A is recessed upward from the center region of the bottom surface 310, and the width D3 of the bottom of the recess 315A in the direction of the first axis (X) is the second axis ( It may be smaller than the width D4 in the Y) direction. That is, the width D4 may be wider than the width D3. The bottom width of the recess 315A satisfies the condition of D3<D4, and the difference may be between 1.5 mm and 5 mm, for example between 1.5 mm and 3 mm. The width D4 may be 3 times or less of D3, for example, 2 times or less. The bottom width ratio (D3:D4) of the recess 315 may have a difference in the range of 1:1.5 to 1:3. When the width D4 in the second axis (Y) direction is smaller than the range D3 in the first axis (X) direction, the luminance improvement in the Y-axis direction is insignificant and is larger than the range in the X-axis direction. The luminance distribution of may be relatively small. In addition, even if the width difference between the bottom widths D3 and D4 of the recess 315 is not large, light emitted from a light source, for example, a light emitting device, induces improvement in light extraction efficiency in a direction in which the width of the recess is wide, for example, the Y-axis direction. can do.

In the optical lens 300A according to the embodiment, the first length D22 in the first axis (X) direction is longer than the second length D23 in the second axis (Y) direction, and the recess 315 ), the width D3 in the first axis (X) direction may be narrower than the width D4 in the second axis (Y) direction. Accordingly, the optical lens 300A can secure the luminance distribution in the second axis (Y) direction due to the external length difference, and in terms of the luminance distribution, the recess 315A can secure the luminance distribution in the first axis (X) direction and It can be widely spread to the corner area. The number of bars of the light emitting module in which the optical lenses 300A are arranged may be reduced to two or less, for example, to one, and the luminance distribution of the upper and lower corners of the backlight unit may be improved.

The incident surface 320A is disposed around the recess 315A and has an apex 21 . A bottom shape of the recess 315 may include an elliptical shape. The recess 315 may have a bell shape, a shell shape, or an elliptical cross section. The recess 315 may have a shape in which a width gradually decreases as it goes up. The recess 315 may have a shape gradually converging from the first edge 23 around the bottom toward the first vertex 21 at the top. When the bottom view of the recess 315 has an elliptical shape, the diameter may gradually decrease toward the first apex 21 . The recess 315 may be provided in an axially symmetrical shape with respect to the central axis Z0. The first vertex 21 of the incident surface 320 may be provided in a dot shape.

Bottom widths D3 and D4 of the recess 315 may have a width into which a light source, that is, a light emitting device to be described later may be inserted. The bottom widths D3 and D4 of the recess 315 may be less than three times the width of the light emitting device, for example, less than 2.5 times. The bottom widths D3 and D4 of the recess 315 may range from 1.2 times to 2.5 times the width of the light emitting device. If it is smaller than the above range, it is not easy to insert the light emitting device. Light loss or light interference may be given through an area between the light emitting element and the first edge 23 .

The first light exit surfaces 330A and 330B may have two curved or spherical shapes due to the curved portion of the center area 336 in the Y-axis direction. The width and vertex 31A of the center region 336 may be lower than the width and vertex of the first and second light exit surfaces 330A and 330B. The first exit surfaces 330A and 330B have at least one or more curved points between 30% and 70% of the effective diameter. Also, the thickness of the center of the optical lens 300A may always have a minimum value. The second light exit surface 335A may be formed as a flat surface or an inclined surface around an outer circumference of the optical lens 300A.

The second light exit surfaces 335A and 335B of the optical lens 300 may be disposed at positions higher than a horizontal axis at the bottom of the recess 315A. The second light exit surface 335 may be a flat surface or an inclined surface, and may be defined as a flange, but is not limited thereto.

The second light exit surfaces 335A and 335B may be disposed perpendicular to or inclined to the horizontal axis. The second light exit surfaces 335A and 335B may extend vertically or obliquely from the outer lines of the first light exit surfaces 330A and 330B. The second light exit surface 335A includes a third edge 35 adjacent to the first light exit surfaces 330A and 330B, and the third edge 35 is the first light exit surface 330A and 330B. ), or may be positioned inside or outside the outer lines of the first light exit surfaces 330A and 330B.

14 and 15, the depth D8 of the recess 315A has a distance from the bottom center P0 to the first vertex 21. Here, the first vertex 21 may be a vertex of the incident surface 320A or an upper end of the recess 315A. The depth D8 of the recess 315A may be 5 mm or more, for example, 6 mm or more, and may have a depth of 75% or more, for example, 80% or more of the thickness D5 of the optical lens 300A. The depth D8 of the recess 315A is 80% of the distance between the second apex 31A and the bottom center P0 or the first edge 23 between the first light exit surfaces 330A and 330B. may be ideal Since the depth D8 of the recess 315A is deep, even if the center area of the first light exit surfaces 330A and 330B does not have a total reflection surface or negative curvature, the first apex of the incident surface 320A Light can be diffused in the lateral direction even in the area adjacent to (21). Since the recess 315A has a deep depth D8, the incident surface 320A transmits light incident from an area close to the second vertex 31A to an area around the first vertex 21 in a lateral direction. can be refracted.

The minimum distance D9 between the recess 315A and the first light exit surfaces 330A and 330B is between the first vertex 21 of the incident surface 320A and the first light exit surfaces 330A and 330B. It may be the interval between the second vertices 31A. The distance D9 may be 3 mm or less, for example, in a range of 0.6 mm to 3 mm or 0.6 mm to 2 mm. When the distance D9 between the first vertex 21 and the second vertex 31A of the incident surface 320A is 3 mm or more, a difference in light quantity may increase depending on the area, and light distribution may not be uniform. When the distance D9 between the first vertex 21 of the incident surface 320A and the second vertex 31A of the first light exit surfaces 330A and 330B is less than 0.6 mm, the center side of the optical lens 300A There is a problem of weakening rigidity. By arranging the distance D9 between the recess 315A and the first light exit surfaces 330A and 330B within the above range, the light path can be diffused outward. This is because the closer the first vertex 21 of the incident surface 320A is to the second vertex 31A between the first light exit surfaces 330A and 330B, the first light exit surface ( 330A and 330B) may increase the amount of light traveling in the lateral direction. Accordingly, the amount of light diffused in the lateral direction of the optical lens 300A, for example, in the X-axis direction, may be increased.

The first vertex 21 of the incident surface 320A is located between the first light exit surfaces 330A and 330B rather than a straight line extending horizontally from the third edge 35 of the second light exit surface 335A. It may be arranged more adjacent to the two vertices 31A.

In the optical lens 300A, the second light exit surfaces 335A and 335B are disposed around the lower circumference of the first light exit surfaces 330A and 330B, and the bottom surface 310 is the second light exit surface 335A, 335B) may be disposed below the second edge 25. The bottom surface 310 may protrude below the horizontal line of the second edge 25 of the second light exit surfaces 335A and 335B. As another example, the optical lens 300A may have a concave-convex surface on the second light exit surface 335 . The uneven surface may be formed of a haze surface having a rough surface. The uneven surface may be a surface on which scattering particles are formed. As another example, the optical lens 300A may have a concave-convex surface on the bottom surface 310 . The concavo-convex surface of the bottom surface 310 may be formed as a haze surface having a rough surface or scattering particles may be formed.

As shown in FIG. 16 , the optical lenses 300A according to the embodiment may be arranged at predetermined intervals in the second axis Y direction on the circuit board 400 . As shown in FIGS. 14 and 15, the optical lenses 300A are arranged in the direction of the second axis Y, where the width of the recess 315A (D4>D3) is wide, so that the distance between the optical lenses 300A is wide. The number of optical lenses 300A may be reduced, and luminance distribution in the first axis (X) direction may be improved by the asymmetric structure of the recess 315A.

16 is a view showing a light emitting module having an optical lens according to an embodiment, FIG. 17 is a G-G side sectional view of the light emitting module of FIG. 16 , and FIG. 18 is a H-H side sectional view of the light emitting module of FIG. 16 .

16 to 18, in the light emitting module 400A, a plurality of optical lenses 300 are disposed on a circuit board 400, and at least one light emitting element 100 is disposed in the optical lens 300. can be placed.

One or a plurality of light emitting devices 100 may be arranged on the circuit board 400 at a predetermined interval. The light emitting element 100 is disposed between the optical lens 300 and the circuit board 400, receives power from the circuit board 400, drives it, and emits light.

The circuit board 400 may include a circuit layer electrically connected to the light emitting device 100 . The circuit board 400 may include at least one of a PCB made of resin, a PCB having a metal core (MCPCB, Metal Core PCB), and a flexible PCB (FPCB), but is not limited thereto.

The optical lens 300 receives the light emitted from the light emitting device 100 through the incident surface 320 and emits the light to the first and second light exit surfaces 330 and 335 . Some of the light incident from the incident surface 320 may be reflected by the bottom surface 310 through a predetermined path and then emitted to the first or second light exit surfaces 330 and 335 .

Here, the beam angle of the light emitting element 100 is a unique beam angle of the light emitting element 100, and may be emitted at 130 degrees or more, for example, 136 degrees or more. The light emitting device 100 may emit light through an upper surface and a plurality of side surfaces. That is, the light emitting device 100 may have at least five or more light exit surfaces. The light emitted from the light emitting device 100 may be emitted at a spread angle through the first and second light exit surfaces 330 and 335 .

In the optical lens 300, the incident surface 320 may be disposed outside the top and side surfaces of the light emitting device 100. The lower region 22 of the incident surface 320 of the optical lens 300 may face a plurality of side surfaces of the light emitting device 100 . Accordingly, light emitted through each side of the light emitting device 100 may be incident to the incident surface 320 without leakage.

Since the light emitting device 100 provides 5 or more light emitting surfaces, a beam angle distribution of the light emitting device 100 can be widened by light emitted through the side surfaces. Since the beam angle distribution of the light emitting element 100 is provided widely, light diffusion using the optical lens 300 is more easily achieved. The beam angle distribution emitted from the optical lens 300 is greater than the angle formed by two straight lines passing through the third edge 35 of the second light exit surface 335 of the optical lens 300 from the central axis P0. can The beam angle distribution emitted from the optical lens 300 includes the directional distribution of the light emitted through the second light exit surface 335, so that light emitted from the second light exit surface 335 Loss can be reduced and luminance distribution can be improved.

Here, the light emitting device 100 may have the same size C0 in the first and second axis (X, Y) directions, and may be disposed in the recess 315 as shown in FIG. 20 . As another example, as shown in FIG. 21 , the light emitting element 100A has a length C2 in the second axis (Y) direction rather than a length C1 in the first axis (X) direction to correspond to the width of the recess 315. can be larger Since the light emitting device 100A is brought closer to the incident surface 320 of the recess 315 due to the difference in lengths C1 and C2 of the side surfaces, light incident efficiency can be improved.

The bottom surface 310 of the optical lens 300 may provide an inclined surface with respect to the top surface of the circuit board 400 . The bottom surface 310 of the optical lens 300 may be provided as an inclined surface with respect to the first axis (X). An area of 80% or more of the bottom surface 310 , eg, an entire area, may be inclined with respect to the top surface of the circuit board 400 . The bottom surface 310 may include a total reflection surface. The upper surface of the circuit board 400 may be disposed closer to the first edge 23 than the second edge 25 of the bottom surface 310 of the optical lens 300 . The first edge 23 of the bottom surface 310 may contact the top surface of the circuit board 400, and the second edge 25 may be spaced apart from the top surface of the circuit board 400 by a maximum distance. there is. The first edge 23 may be disposed at a position lower than the active layer in the light emitting device 100, thereby preventing loss of light.

The first and second light exit surfaces 330 and 335 of the optical lens 300 refract and emit incident light. The entire area of the first light exit surface 330 may be formed as a curved surface through which light is emitted. The first light exit surface 330 includes a curved shape continuously connected from the second vertex 31 . The first light exit surface 330 may reflect or refract incident light and emit it to the outside. With respect to the central axis Z0 of the first light exit surface 330 , an emission angle of light emitted from the first light exit surface 330 after refraction may be greater than an incident angle before refraction.

The second light exit surface 335 refracts the angle of light after refraction smaller than the angle of incident light before refraction with respect to the central axis Z0 . Accordingly, it is possible to provide a long optical interference distance between adjacent optical lenses 300, and some of the light emitted through the second light exit surface 335 and the light emitted through the first light exit surface 330 are transferred to the optical lens ( 300) may be mixed with each other in the vicinity.

The second light exit surface 335 is disposed around the lower portion of the first light exit surface 330 to refract and emit incident light. The second light exit surface 335 includes an inclined surface or a flat surface. The second light exit surface 335 may be, for example, a surface perpendicular to the upper surface of the circuit board 400 or an inclined surface. When the second light exit surface 335 is formed as an inclined surface, there is an effect of easy separation during injection molding. The second light exit surface 335 receives some light emitted from the side of the light emitting device 100, refracts it, and extracts it. In this case, the second light exit surface 335 may have an exit angle of the emitted light smaller than an incident angle before refraction with respect to the central axis Z0 . Accordingly, it is possible to provide a long optical interference distance between adjacent optical lenses 300 .

The optical lens 300 according to the embodiment has a structure in which the width of the bottom of the recess 315 is wider in the direction of the second axis (Y) than in the direction of the first axis (X), and is mounted on the circuit board 400 along the Y axis. direction can be arranged. Accordingly, the light of the light emitting device 100 emitted into the recess 315 may be diffused in the second axis (Y) direction within the recess 315 and then spread in the first axis (X) direction and corner areas. there is. According to the embodiment, light in a specific axial direction can be further diffused by the recess 315 having an asymmetric structure, so that the number of bars of the light emitting module can be reduced.

Meanwhile, one or a plurality of support protrusions 350 disposed under the optical lens 300 protrude downward from the bottom surface 310 , that is, toward the circuit board 400 . A plurality of the support protrusions 350 are fixed on the circuit board 400 and can prevent the optical lens 300 from being tilted.

19 is a view illustrating a light unit having an optical lens according to an embodiment.

Referring to FIG. 19 , the light unit includes a bottom cover 510, a plurality of circuit boards 400 as a light emitting module 400A within the bottom cover 510, a light emitting device 100, and the plurality of circuit boards 400. and an optical lens 300 disposed thereon. The plurality of circuit boards 400 may be arranged in the bottom 511 of the bottom cover 510 .

The side cover 512 of the bottom cover 510 may reflect the light emitted from the light emitting module 400A or reflect it toward the display panel.

Two or less, for example, one circuit board 400 of the light emitting module 301 may be arranged in the bottom cover 510 . The circuit board 400 may include a circuit layer electrically connected to the light emitting device 100 .

The bottom cover 510 may include a metal or thermally conductive resin material for heat dissipation. The bottom cover 510 may include an accommodating part, and a side cover may be provided around the accommodating part. A reflective sheet (not shown) may be disposed on the circuit board 400 according to the embodiment. The reflective sheet may be formed of, for example, PET, PC, PVC resin, etc., but is not limited thereto.

An optical sheet (not shown) may be disposed on the bottom cover 510 according to the embodiment, and the optical sheet may include at least one of prism sheets that collect scattered light, a luminance enhancement sheet, and a diffusion sheet that diffuses the light again. can include A light guide layer (not shown) made of a transparent material may be disposed in a region between the optical sheet and the light emitting module, but is not limited thereto.

28 (A) is a luminance distribution of an optical lens of a comparative example, and (B) is a diagram showing a luminance distribution of an optical lens according to an embodiment. As shown in (B) of FIG. 28, it can be seen that the luminance distribution of the optical lens according to the embodiment has a wide distribution in the Y-Y' axis direction and spreads in the X-X' axis direction.

29 (A) (B) are diagrams comparing radiation patterns of optical lenses according to Comparative Example and Example. The optical lens of Comparative Example has the same radiation pattern, but the radiation pattern of the optical lens according to the embodiment is Y It can be seen that the sizes of the radiation patterns in the Y'-axis direction (FIG. 28B) and the X-X'-axis direction (FIG. 28B) are different. It can be seen that this can be diffused in a specific axis direction and then diffused in another axis direction.

30 shows Y-Y′-axis luminance distributions of optical lenses according to Comparative Examples and Examples, and FIG. 31 shows X-X′-axis luminance distributions of optical lenses according to Comparative Examples and Examples. It can be seen that the luminance distribution of the optical lens according to the embodiment is higher in the Y-Y' axis direction of FIG. 28 and higher within a specific distance in the X-X' axis direction. 30 and 31, the Y-Y' axis is a direction in which the length of the recess is long and represents a relatively high light distribution, and the axis X-X' is a direction in which the length of the recess is short and represents a relatively narrow light distribution. It can be seen that it represents

32 is a view comparing the luminous intensity of the optical lens according to the embodiment in the X-X' and Y-Y' directions and the luminous intensity of the optical lens (FIG. 28A) of the comparative example, X of the optical lens according to the embodiment - It can be seen that the luminous intensity in the X' axis direction is high and the luminous intensity in the Y-Y' axis direction is dispersed. Here, the symmetrical radiation pattern is 156 degrees or less, and the radiation pattern of the asymmetrical lens according to the embodiment may be 160 degrees or more. In addition, it can be seen that the half width of the side beam appears wider in the asymmetric lens.

33 (A) (B) (C) is a view showing the luminance distribution and luminous intensity in each axis direction in the light emitting module having the optical lens according to the second embodiment, and FIG. 34 is a view showing the optical lens of FIG. 33 It is a diagram showing the luminance distribution in the light unit and the luminous intensity in each axis direction. Here, the light emitting module in the light unit is an example implemented with 1 bar, and it can be seen that the light is distributed in a uniform light distribution over the entire area. Here, in the 1 bar, for example, 15 or less, for example, 10 or less light emitting devices may be disposed.

35 (A) (B) (C) is a view showing luminance distribution and luminous intensity in each axis direction in a light emitting module having an optical lens according to the third embodiment, and FIG. 36 is a view showing the optical lens of FIG. 35 It is a diagram showing the luminance distribution in the light unit and the luminous intensity in each axis direction. Here, the light emitting module in the light unit is an example implemented with one bar, and it can be seen that light is distributed in a uniform light distribution over the entire area.

The optical lens according to the embodiment may include at least one or a plurality of side protrusions on the second light exit surface 335 . As shown in FIG. 22 , the side protrusions 360 and 361 may be arranged on a line passing through the center of the bottom of the recess 315 in the direction of the second axis (Y). The side protrusions 360 and 361 may be disposed along the area of the circuit board 400 of FIG. 16 . The side protrusions 360 and 361 of the plurality of optical lenses may protrude in the same axial direction. The side protrusions 360 and 361 may be gate regions.

As another example, as shown in FIG. 23 , side protrusions 362 and 363 of the optical lens may protrude in directions opposite to each other from the second light exit surface 335 based on the first axis X direction. The side protrusion 360 of the optical lens may deviate from the area of the circuit board 400 as shown in FIG. 16 . The side protrusions 362 and 363 may be gate regions.

24 is a light source unit having an optical lens according to an embodiment, and is a view showing a fifth embodiment.

Referring to FIG. 24 , the light source unit may include a light emitting device 100 , a fixing plate 650 and an optical lens 300 .

The fixing plate 650 may be formed of a metal plate. The metal material may be formed of any one of Ag, Al, Au, Cr, Co, Cu, Fe, Hf, In, Mo, Ni, Si, Sn, Ta, Ti, W and selective alloys of these metals. The fixing plate 650 may be formed in a single layer or multiple layers.

Since the fixing plate 650 is equal to or larger than the width of the optical lens 300, for example, the length of the elliptical shape, leakage of light can be prevented. The fixing plate 650 includes an opening 652, and a lower width D15 of the opening 652 may be narrower than an upper width D16. A bottom area of the opening 652 may be narrower than a top area. The height of the opening 652 may be greater than the thickness of the fixing plate 650 . The thickness of the fixing plate 650 may have a range of 0.35 mm or less, for example, 0.2 mm to 0.3 mm, and if the thickness of the fixing plate 650 is thicker than the above range, material waste is large, and when the thickness is smaller than the above range The function as a support member may be weakened.

The fixing plate 650 may be disposed to be physically separated from the light emitting device 100 . The fixing plate 650 may be electrically separated from the light emitting device 100 . The fixing plate 650 is disposed around the light emitting device 100 to reflect light emitted from the light emitting device 100, protect the light emitting device 100, and support the optical lens 300. do.

The upper surface area of the support part 651 of the fixed plate 650 may be larger than the bottom area of the optical lens 300 to prevent light from leaking from the optical lens 300 to the upper surface of the fixed plate 650. can do.

Looking at the opening 652 of the fixing plate 650, it includes a side wall 653 bent from the support part 651 and an extension part 654 bent from the side wall 653, and the side wall 653 has It is bent from the support part 651 of the fixing plate 650 in a downward or vertical direction, and the extension part 654 extends from the sidewall 653 toward the direction of the light emitting device 100 or the center of the opening 652, that is, , which protrudes in the horizontal direction.

The opening 652 may have a polygonal shape in a top view, for example, a quadrangular shape. A top view shape of the opening 652 may be the same as that of the light emitting device 100 . The top view shape of the opening 652 may be another shape, for example, a circular shape or an elliptical shape, but is not limited thereto. Upper and lower portions of the opening 652 have an open structure.

The bottom view shape of the opening 652 may be a polygonal shape, for example, a quadrangular shape. The opening 652 may have a bottom view shape identical to that of the light emitting device 100 . When the extension part 654 is not present, the bottom width D15 of the opening 652 may be equal to or narrower than the upper width D16 and may be larger than the width C1 of the light emitting device 100 .

The upper width D16 of the opening 652 may be disposed in a range of 1.2 to 1.5 times greater than the bottom width D15, and the upper width D15 is greater than the bottom width D16. If the range is smaller than the above range, light extraction efficiency may be reduced, and if the range is larger than the above range, there is a problem in that the width of the bottom of the recess 315 of the optical lens 300 increases. The upper width D16 of the opening 652 may be 2 mm or less, for example, in the range of 1.4 mm to 1.8 mm. When the upper width D16 of the opening 652 is smaller than the above range, the area of the extension portion 654 of the opening 652 may be reduced so that the supporting function of the opening 652 may deteriorate. A bottom area of the recess 315 of the optical lens 300 may be increased.

Here, the bottom width of the recess 315 of the optical lens 300 may be equal to or smaller than the top width D16 of the opening 652 of the fixing plate 650 . Accordingly, the light emitted through the opening 652 of the fixed plate 650 is incident into the recess 315 of the optical lens 300, and a part of the light is incident through the first bottom part 312 of the bottom surface. It can be. A portion of the first bottom portion 312 of the bottom surface 310 of the optical lens 300 may overlap the opening 652 of the fixing plate 650 in a vertical direction.

The upper surface of the extension part 654 of the opening 652 is disposed at a lower position than the active layer in the light emitting device 100 to reduce loss of light emitted to the side of the active layer. An upper surface of the extension portion 654 of the opening 652 may be disposed at a location less than 1/3 of the thickness of the light emitting device 100 . When the position of the upper surface of the extension part 654 of the opening 652 is higher than the above range, loss of light emitted to the side of the light emitting device 100 may increase.

The fixing plate 650 may include a fixing groove 665 or a support protrusion 350 as a coupling means. As a coupling means of the fixing plate 650, for example, when a fixing groove 665 is disposed, the fixing groove 665 may be disposed at a depth less than 1/2 of the thickness of the fixing plate 650. The fixing groove 665 may have a circular shape, a polygonal shape, or an elliptical shape in a top view. The fixing groove 665 may have a polygonal or hemispherical cross section, but is not limited thereto. When the fixing groove 665 has a polygonal shape or a hemispherical shape, it can be easily combined with the support protrusion 350 of the optical lens 300 . The support protrusion 350 of the optical lens 300 may have a side end face coupled to the fixing groove 665, for example, a polygonal shape or a hemispherical shape. The support protrusion 350 of the optical lens 300 may be attached to the fixing groove 665 of the fixing plate 650 with an adhesive (not shown).

The top view shape of the fixing groove 665 and the support protrusion 350 may be continuous or discontinuous. Here, in the discontinuous shape, two or more fixing grooves 665 or support protrusions 350 may be arranged spaced apart from each other along a circle. As another example, the coupling means may be disposed in the support protrusion 350 of the fixing plate 650 and the fixing groove 665 of the optical lens 300 .

The fixing plate 650 includes leg parts 661 and 663 bent downward from the support part 651 supporting the light source lens 300, and the leg parts 661 and 663 control the position of the fixing plate 650. can elevate The leg parts 661 and 663 include first and second leg parts 661 and 663 disposed on opposite sides of the fixing plate 650, and the first and second leg parts 661 and 663 are lowered from the fixing plate 650. can be bent in either direction. The first and second leg parts 661 and 663 may be inclined in a vertical direction or within a range of 90±10 degrees from the fixing plate 650 .

The fixing plate 650 may include fixing parts 662 and 664 bent from each of the leg parts 661 and 663 . The fixing parts 662 and 664 include a first fixing part 662 bent in a horizontal direction from the first leg part 661 and a second fixing part 664 bent in a horizontal direction from the second leg part 663 ) may be included. The first and second fixing parts 662 and 664 are bent outward from the first and second leg parts 661 and 663, thereby providing a horizontal bottom surface. The first and second fixing parts 662 and 664 may be attached to another structure (eg, a circuit board) by an adhesive member. The first and second fixing parts 662 and 664 may be arranged in a direction parallel to the fixing plate 650 . The first and second fixing parts 662 and 664 fix both bottoms of the fixing plate 650, thereby preventing the fixing plate 650 from moving.

The fixing plate 650 may have first and second fixing parts 662 and 664 disposed at both ends in the first axis (X) direction, and at both ends in the second axis direction orthogonal to the first axis (X) direction. The fixing parts 662 and 664 and the leg parts 661 and 663 may not be disposed.

As another example, the first and second fixing parts 662 and 664 may be bent inward or inward/outward from the first and second leg parts 661 and 663 . When the first and second fixing parts 662 and 664 are bent inwardly from the first and second leg parts 661 and 663, it is possible to prevent the fixing plate 650 from being struck downward. When the first and second fixing parts 662 and 664 are bent inward or outward from the first and second leg parts 661 and 663, some of the first and second fixing parts 662 and 664 are bent inwardly, The other portion may be bent outward to prevent the fixing plate 650 from sagging.

In the embodiment, the bent portion within the fixing plate 650 may have an angular structure or be bent with a curved surface, but is not limited thereto.

The fixing plate 650 may have a gap area 655 between the sidewall 654 of the opening 652 and the first and second leg parts 661 and 663, and the gap area 655 is the fixed The plates 650 may be spaced apart at predetermined intervals.

The height of the upper surface of the fixed plate 650 may be 1 mm or less, for example, in the range of 0.6 mm to 0.9 mm. ) may be degraded, and the height of the light source unit may increase if it is greater than the above range. The height of the upper surface of the fixed plate 650 is higher than the upper surface of the light emitting element 100 to protect the light emitting element 100 disposed in the fixed plate 650 and to block the light emitted from the light emitting element 100. It may be guided by an optical lens 300 .

A white layer (not shown) may be formed on the upper surface of the fixed plate 650, and the white layer is a layer in which a metal oxide such as SiO ₂ , Al ₂ O ₃ , or TiO ₂ is added to a resin material. can be formed. The white layer may contact the first bottom portion 312 of the bottom surface 310 of the optical lens 300 . The white layer may reflect light leaked from the bottom surface 310 of the optical lens 300 .

In the bottom surface 310 of the optical lens 300, the first bottom portion 312 may be disposed on a region between the fixing groove 665 of the fixing plate 650 and the opening 652, and The second bottom part 314 may be spaced apart from the upper surface of the fixing plate 650 . The configuration of the optical lens 300 according to the embodiment will be referred to the configuration of the first embodiment. Most of the light emitted from the light emitting element 100 may be guided to the recess 315 of the optical lens 300 through the opening 652 of the fixed plate 650, so that the optical lens 300 Light lost by going to the bottom surface 310 of the can be reduced. Accordingly, the width of the optical lens 300 may be greater than the upper surface of the fixing plate 650 . The light emitting device 100 may be disposed in the opening 652 of the fixing plate 650 . Since the sidewall 654 of the opening 652 is disposed around the light emitting element 100 , light emitted from the light emitting element 100 may be reflected.

A distance G5 between the light emitting element 100 and the bottom of the recess 315 of the optical lens 300 may be 1 mm or less, for example, 0.7 mm or less. Accordingly, light emitted from the light emitting device 100 may be effectively incident to the recess 315 of the optical lens 300 .

One or a plurality of the fixing plate 650 may be arranged on the circuit board 400 of FIG. 16 . The plurality of fixing plates 650 may be arranged in one or more rows. The light emitting device 100 may be connected to the circuit board 400 . The fixing plate 650 may not be electrically connected to the circuit board 400 . The first and second fixing parts 662 and 664 of the fixing plate 650 may be attached to the circuit board 400 by an adhesive member. The adhesive member may include a material such as solder.

A fluorescent film may be disposed on the surface of the light emitting device 100 according to the embodiment. The fluorescent film includes at least one or a plurality of blue phosphors, cyan phosphors, green phosphors, yellow phosphors, and red phosphors, and may be disposed in a single layer or multiple layers. In the above fluorescent film, a fluorescent substance is added into a light-transmitting resin material. The light-transmissive resin material includes a material such as silicon or epoxy, and the phosphor may be selectively formed from among YAG, TAG, Silicate, Nitride, and Oxy-nitride-based materials. The fluorescent film may include a fluorescent material such as quantum dots. The quantum dot may include a II-VI compound or a III-V compound semiconductor, and may include at least one of red, green, yellow, and red quantum dots, or different types. The quantum dots are nanometer-sized particles that may have optical properties arising from quantum confinement. In order to emit light of a desired wavelength from the quantum dots when stimulated with a specific excitation source, a specific composition(s), structure and/or size of the quantum dots may be selected. Quantum dots can be tuned to emit light across the visible spectrum by changing their size. The quantum dot may include one or more semiconductor materials, and examples of the semiconductor material include a group IV element, a group II-VI compound, a group II-V compound, a group III-VI compound, a group III-V compound, a group IV- Group VI compounds, Group I-III-VI compounds, Group II-IV-VI compounds, Group II-IV-V compounds, alloys comprising any of the foregoing, and/or ternary and quaternary mixtures or alloys. It may include a mixture comprising any of the foregoing. The quantum dots may be, for example, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, GaN, GaP, GaAs, GaSb, InP, InAs, InSb, AlS, AlP, AlAs, PbS, PbSe, Ge, Si, CuInS ₂ , CuInSe ₂ , MgS, MgSe, MgTe, and the like, and combinations thereof.

Examples of light emitting devices according to embodiments will be described with reference to FIGS. 25 to 27 . 25 is a view showing a first example of a light emitting device according to an embodiment. An example of a light emitting element and a circuit board will be described with reference to FIG. 25 .

Referring to FIG. 25 , the light emitting device 100 includes a light emitting chip 100A. The light emitting device 100 may include a light emitting chip 100A and a phosphor layer 150 disposed on the light emitting chip 100A. The phosphor layer 150 includes at least one or a plurality of blue, green, yellow, and red phosphors, and may be disposed in a single layer or multiple layers. The phosphor layer 150 is a light-transmitting resin material in which a phosphor is added. The light-transmissive resin material includes a material such as silicon or epoxy, and the phosphor may be selectively formed from among YAG, TAG, Silicate, Nitride, and Oxy-nitride-based materials.

The phosphor layer 150 may be disposed on the upper surface of the light emitting chip 100A, or may be disposed on the upper surface and side surface of the light emitting chip 100A. The phosphor layer 150 is disposed on an area where light is emitted from the surface of the light emitting chip 100A, and can convert a wavelength of light.

The phosphor layer 150 may include a single layer or different phosphor layers, wherein a first layer of the different phosphor layers may have at least one type of phosphor among red, yellow, and green phosphors, and a second layer may include It is formed on the first layer and may have a phosphor different from that of the first layer among red, yellow, and green phosphors. As another example, the different phosphor layers may include three or more phosphor layers, but is not limited thereto.

As another example, the phosphor layer 150 may include a film type. The film-type phosphor layer may have a uniform color distribution according to wavelength conversion by providing a uniform thickness.

Describing the light emitting chip 100A, the light emitting chip 100A includes a substrate 111, a first semiconductor layer 113, a light emitting structure 120, an electrode layer 131, an insulating layer 133, a first An electrode 135 , a second electrode 137 , a first connection electrode 141 , a second connection electrode 143 , and a support layer 140 may be included.

The substrate 111 may use a light-transmissive, insulating or conductive substrate, for example, sapphire (Al ₂ O ₃ ), SiC, Si, GaAs, GaN, ZnO, Si, GaP, InP, Ge, Ga ₂ O ₃ At least one can be used. A plurality of convex portions (not shown) may be formed on at least one or both of the top and bottom surfaces of the substrate 111 to improve light extraction efficiency. The side cross-sectional shape of each convex portion may include at least one of a hemispherical shape, a semi-elliptical shape, or a polygonal shape. Here, the substrate 111 may be removed from the light emitting chip 100A. In this case, the first semiconductor layer 113 or the first conductive type semiconductor layer 115 serves as a top layer of the light emitting chip 100A. can be placed.

A first semiconductor layer 113 may be formed under the substrate 111 . The first semiconductor layer 113 may be formed using a compound semiconductor of a group II to V element. The first semiconductor layer 113 may be formed of at least one layer or a plurality of layers using compound semiconductors of Group II to Group V elements. The first semiconductor layer 113 is a semiconductor layer using a compound semiconductor of a group III-V element, for example, GaN, InN, AlN, InGaN, AlGaN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, AlGaInP, It may include at least one of GaP. The first semiconductor layer 113 has a composition formula of In _x Al _y Ga _{1 -x- y} N (0≤x≤1, 0≤y≤1, 0≤x+y≤1), and a buffer layer and an undoped (undoped) may be formed of at least one of the semiconductor layers. The buffer layer may reduce a difference in lattice constant between the substrate and the nitride semiconductor layer, and the undoped semiconductor layer may improve crystal quality of the semiconductor. Here, the first semiconductor layer 113 may not be formed.

A light emitting structure 120 may be formed under the first semiconductor layer 113 . The light emitting structure 120 is selectively formed from compound semiconductors of group II to V elements and group III-V elements, and may emit light with a predetermined peak wavelength within a wavelength range from an ultraviolet band to a visible ray band.

The light emitting structure 120 is formed between a first conductivity type semiconductor layer 115, a second conductivity type semiconductor layer 119, and the first conductivity type semiconductor layer 115 and the second conductivity type semiconductor layer 119. It includes the formed active layer 117, and another semiconductor layer may be further disposed on at least one of above and below each of the layers 115, 117, and 119, but is not limited thereto.

The first conductivity type semiconductor layer 115 is disposed under the first semiconductor layer 113 and may be implemented as a semiconductor doped with a first conductivity type dopant, for example, an n-type semiconductor layer. The first conductive semiconductor layer 115 has a composition formula of In _x Al _y Ga _{1 -x- y} N (0≤x≤1, 0≤y≤1, 0≤x+y≤1). The first conductive type semiconductor layer 115 may be selected from compound semiconductors of group III-V elements, for example, GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, and AlGaInP. . The first conductivity-type dopant is an n-type dopant and includes a dopant such as Si, Ge, Sn, Se, or Te.

The active layer 117 is disposed below the first conductive type semiconductor layer 115 and selectively includes a single quantum well, a multiple quantum well (MQW), a quantum wire structure, or a quantum dot structure. and includes the period of the well layer and the barrier layer. The period of the well layer/barrier layer is, for example, InGaN/GaN, GaN/AlGaN, AlGaN/AlGaN, InGaN/AlGaN, InGaN/InGaN, AlGaAs/GaA, InGaAs/GaAs, InGaP/GaP, AlInGaP/InGaP, InP/GaAs includes at least one of the pairs of

The second conductive semiconductor layer 119 is disposed below the active layer 117 . The second conductivity type semiconductor layer 119 is a semiconductor doped with a second conductivity type dopant, for example, In _x Al _y Ga _{1 -x- y} N (0≤x≤1, 0≤y≤1, 0≤x+ y≤1). The second conductive semiconductor layer 119 may be formed of at least one of compound semiconductors such as GaN, InN, AlN, InGaN, AlGaN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, and AlGaInP. The second conductivity type semiconductor layer 119 is a p-type semiconductor layer, and the first conductivity type dopant is a p-type dopant and may include Mg, Zn, Ca, Sr, or Ba.

As another example of the light emitting structure 120 , the first conductive semiconductor layer 115 may be implemented as a p-type semiconductor layer and the second conductive semiconductor layer 119 may be implemented as an n-type semiconductor layer. A third conductivity type semiconductor layer having a polarity opposite to that of the second conductivity type may be formed on the second conductivity type semiconductor layer 119 . In addition, the light emitting structure 120 may be implemented with any one of a n-p junction structure, a p-n junction structure, an n-p-n junction structure, and a p-n-p junction structure.

An electrode layer 131 is formed under the second conductive semiconductor layer 119 . The electrode layer 131 may include a reflective layer. The electrode layer 131 may include an ohmic contact layer in contact with the second conductivity type semiconductor layer 119 of the light emitting structure 120 . The reflective layer may be selected from materials having a reflectance of 70% or more, for example, Al, Ag, Ru, Pd, Rh, Pt, Ir, and alloys of two or more of the above metals. A metal of the reflective layer may contact a lower portion of the second conductive semiconductor layer 119 . The ohmic contact layer may be selected from a light-transmissive material, a metal material, or a non-metal material.

The electrode layer 131 may include a laminated structure of a light-transmitting electrode layer/reflective layer, and the light-transmitting electrode layer may include, for example, indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), or indium aluminum (IAZO). zinc oxide), indium gallium zinc oxide (IGZO), indium gallium tin oxide (IGTO), aluminum zinc oxide (AZO), antimony tin oxide (ATO), gallium zinc oxide (GZO), Ag, Ni, Al, Rh, Pd , Ir, Ru, Mg, Zn, Pt, Au, Hf, and optional combinations thereof. A reflective layer made of a metallic material may be disposed under the light-transmitting electrode layer. can be formed As another example, the reflective layer may be formed of a distributed bragg reflection (DBR) structure in which two layers having different refractive indices are alternately disposed.

A light extraction structure such as roughness may be formed on the surface of at least one of the second conductive semiconductor layer 119 and the electrode layer 131, and this light extraction structure changes the critical angle of the incident light, Light extraction efficiency can be improved.

The insulating layer 133 is disposed below the electrode layer 131, and the lower surface of the second conductive semiconductor layer 119, the side surface of the second conductive semiconductor layer 119 and the active layer 117, the It may be disposed in a partial area of the first conductive type semiconductor layer 115 . The insulating layer 133 is formed in an area other than the electrode layer 131, the first electrode 135, and the second electrode 137 in the lower area of the light emitting structure 120, so that the light emitting structure 120 The lower part is electrically protected.

The insulating layer 133 includes an insulating material or an insulating resin formed of at least one of oxide, nitride, fluoride, and sulfide having at least one of Al, Cr, Si, Ti, Zn, and Zr. The insulating layer 133 may be selectively formed from, for example, SiO ₂ , Si ₃ N ₄ , Al ₂ O ₃ , and TiO ₂ . The insulating layer 133 may be formed as a single layer or multiple layers, but is not limited thereto. The insulating layer 133 is formed to prevent an interlayer short circuit of the light emitting structure 120 when a metal structure for flip bonding is formed under the light emitting structure 120 .

The insulating layer 133 may be formed of a DBR (distributed bragg reflector) structure in which first and second layers having different refractive indices are alternately disposed, and the first layer is SiO ₂ , Si ₃ N ₄ , It is any one of Al ₂ O ₃ and TiO ₂ , and the second layer may be formed of any material other than the first layer, but is not limited thereto, or the first layer and the second layer are formed of the same material. Or it may be formed as a pair having three or more layers. In this case, the electrode layer may not be formed.

A first electrode 135 may be disposed below a portion of the first conductive semiconductor layer 115 , and a second electrode 137 may be disposed below a portion of the electrode layer 131 . A first connection electrode 141 is disposed below the first electrode 135 , and a second connection electrode 143 is disposed below the second electrode 137 .

The first electrode 135 is electrically connected to the first conductivity-type semiconductor layer 115 and the first connection electrode 141, and the second electrode 137 connects the second electrode 137 through the electrode layer 131. It may be electrically connected to the two-conductivity semiconductor layer 119 and the second connection electrode 143 .

The first electrode 135 and the second electrode 137 are made of at least one of Cr, Ti, Co, Ni, V, Hf, Ag, Al, Ru, Rh, Pt, Pd, Ta, Mo, W or an alloy. It may be formed, and may be formed in a single layer or multiple layers. The first electrode 135 and the second electrode 137 may have the same stacked structure or different stacked structures. At least one of the first electrode 135 and the second electrode 137 may further have a current diffusion pattern such as an arm or a finger structure. In addition, the first electrode 135 and the second electrode 137 may be formed in one or a plurality, but are not limited thereto. At least one of the first and second connection electrodes 141 and 143 may be disposed in plurality, but is not limited thereto.

The first connection electrode 141 and the second connection electrode 143 provide a lead function for supplying power and a heat dissipation path. The first connection electrode 141 and the second connection electrode 143 may include at least one of a circular shape, a polygonal shape, a circular columnar shape, or a polygonal columnar shape. The first connection electrode 141 and the second connection electrode 143 are made of metal powder material, for example, Ag, Al, Au, Cr, Co, Cu, Fe, Hf, In, Mo, Ni, Si, Sn, Ta , Ti, W, and selective alloys of these metals. The first connection electrode 141 and the second connection electrode 143 are In, Sn, Ni, Cu and their optional alloys to improve adhesion with the first electrode 135 and the second electrode 137. It can be plated with any one of the metals.

The support layer 140 includes a thermally conductive material and is disposed around the first electrode 135, the second electrode 137, the first connection electrode 141, and the second connection electrode 143. It can be. Bottom surfaces of the first and second connection electrodes 141 and 143 may be exposed on the bottom surface of the support layer 140 .

The supporting layer 140 is used as a layer supporting the light emitting device 100 . The support layer 140 is formed of an insulating material, and the insulating material is formed of, for example, a resin layer such as silicone or epoxy. As another example, the insulating material may include a paste or insulating ink. The material of the insulating material is polyacrylate resin, epoxy resin, phenolic resin, polyamides resin, polyimides rein, unsaturated polyesters resin, polyphenylene ether resin (PPE), polyphenilene oxide resin (PPO), polyphenylenesulfides resin, cyanate ester resin, benzocyclobutene (BCB), Polyamido-amine Dendrimers (PAMAM), and Polypropylene-imine, Dendrimers (PPI), and PAMAM-OS (organosilicon) having a PAMAM inner structure and an organo-silicon outer surface alone or in combination. It can be. The support layer 140 may be formed of a material different from that of the insulating layer 133 .

At least one of oxides, nitrides, fluorides, and sulfides having at least one of Al, Cr, Si, Ti, Zn, and Zr may be added to the supporting layer 140 . Here, the compound added into the support layer 140 may be a heat spreader, and the heat spreader may be used as powder particles, grains, fillers, and additives of a predetermined size. The heat spreader includes a ceramic material, and the ceramic material includes a co-fired low temperature co-fired ceramic (LTCC), a high temperature co-fired ceramic (HTCC), and alumina. , quartz, calcium zirconate, forsterite, SiC, graphite, fusedsilica, mullite, cordierite, zirconia, beryllia ), and at least one of aluminum nitride. The ceramic material may be formed of a metal nitride having higher thermal conductivity than nitride or oxide among insulating materials such as nitride or oxide, and the metal nitride may include, for example, a material having thermal conductivity of 140 W/mK or more. Examples of the ceramic material include SiO ₂ , Si _x O _y , Si ₃ N ₄ , Si _x N _y , SiO _x N _y , Al ₂ O ₃ , BN, Si ₃ N ₄ , SiC(SiC-BeO), BeO, It may be a ceramic type such as CeO or AlN. The thermally conductive material may include a component of C (diamond, CNT).

The light emitting chip 100A is mounted on the circuit board 400 in a flip manner. The circuit board 400 includes a metal layer 471, an insulating layer 472 on the metal layer 471, a circuit layer (not shown) having a plurality of lead electrodes 473 and 474 on the insulating layer 472, and the circuit layer It includes a protective layer 475 to protect. The metal layer 471 is a heat dissipation layer, and includes a metal having high thermal conductivity, such as Cu or a Cu-alloy, and may be formed in a single-layer or multi-layer structure.

The insulating layer 472 insulates between the metal layer 471 and the circuit layer. The insulating layer may include at least one of resin materials such as epoxy, silicone, glass fiber, prepreg, polyphthalamide (PPA), liquid crystal polymer (LCP), and polyamide9T (PA9T). . In addition, an additive such as metal oxide, for example, TiO ₂ , SiO ₂ , Al ₂ O ₃ may be added to the insulating layer 472 , but is not limited thereto. As another example, the insulating layer 472 may be used by adding a material such as graphene to an insulating material such as silicon or epoxy, but is not limited thereto.

The insulating layer 472 may be an anodized region formed by an anodizing process of the metal layer 471 . Here, the metal layer 471 may be made of aluminum, and the anodized region may be made of a material such as Al ₂ O ₃ .

The first and second lead electrodes 473 and 474 are electrically connected to the first and second connection electrodes 141 and 143 of the light emitting chip 100A. Conductive adhesives 461 and 462 may be disposed between the first and second lead electrodes 473 and 474 and the connection electrodes 141 and 143 of the light emitting chip 100A. The conductive adhesives 461 and 462 may include a metal material such as a solder material. The first lead electrode 473 and the second lead electrode 474 are circuit patterns and supply power.

The protective layer 475 may be disposed on the circuit layer. The protective layer 475 includes a reflective material and may be formed of, for example, a resist material, for example, a white resist material, but is not limited thereto. The protective layer 475 may function as a reflective layer, and may be formed of, for example, a material having higher reflectance than absorbance. As another example, the protective layer 475 may be formed of a material that absorbs light, and the light absorbing material may include a black resist material.

A second example of a light emitting element will be described with reference to FIG. 26 .

Referring to FIG. 26 , the light emitting device 100 includes a light emitting chip 100B. The light emitting device 100 may include a light emitting chip 100B and a phosphor layer 150 disposed on the light emitting chip 100B. The phosphor layer 150 includes at least one or a plurality of blue, green, yellow, and red phosphors, and may be disposed in a single layer or multiple layers. The phosphor layer 150 is a light-transmitting resin material in which a phosphor is added. The light-transmissive resin material includes a material such as silicon or epoxy, and the phosphor may be selectively formed from among YAG, TAG, Silicate, Nitride, and Oxy-nitride-based materials.

The phosphor layer 150 may be disposed on the upper surface of the light emitting chip 100B or may be disposed on the upper surface and side surface of the light emitting chip 100B. The phosphor layer 150 is disposed on an area where light is emitted from the surface of the light emitting chip 100B, and can convert a wavelength of light.

The light emitting chip 100B includes a substrate 111, a first semiconductor layer 113, a light emitting structure 120, an electrode layer 131, an insulating layer 133, a first electrode 135, and a second electrode 137. , a first connection electrode 141, a second connection electrode 143, and a support layer 140 may be included. The substrate 111 and the second semiconductor layer 113 may be removed.

The light emitting chip 100B of the light emitting device 100 and the circuit board 400 may be connected through connection electrodes 161 and 162, and the connection electrodes 161 and 162 may include a conductive pump, that is, a solder bump. One or a plurality of the conductive pumps may be arranged under each of the electrodes 135 and 137, but is not limited thereto. The insulating layer 133 may expose the first and second electrodes 135 and 137, and the first and second electrodes 135 and 137 may be electrically connected to the connection electrodes 161 and 162.

Referring to Fig. 27, a third example of a light emitting element will be described.

Referring to FIG. 27 , the light emitting device 100 includes a light emitting chip 200A connected to a circuit board 400 . The light emitting device 100 may include a phosphor layer 250 disposed on the surface of the light emitting chip 200A. The phosphor layer 250 converts the wavelength of incident light. As shown in FIG. 4 , an optical lens ( 300 in FIG. 4 ) is disposed on the light emitting element 100 to adjust the directing characteristics of the light emitted from the light emitting chip 200A.

The light emitting chip 200A includes a light emitting structure 225 and a plurality of pads 245 and 247 . The light emitting structure 225 may be formed of a compound semiconductor layer of a group II to VI element, for example, a compound semiconductor layer of a group III-V element or a compound semiconductor layer of a group II-VI element. The plurality of pads 245 and 247 are selectively connected to the semiconductor layer of the light emitting structure 225 and supply power.

The light emitting structure 225 includes a first conductive semiconductor layer 222 , an active layer 223 and a second conductive semiconductor layer 224 . The light emitting chip 200A may include a substrate 221 . The substrate 221 is disposed on the light emitting structure 225 . The substrate 221 may be, for example, a light transmitting or insulating substrate or a conductive substrate. This configuration will refer to the description of the light emitting structure and the substrate of FIG. 4 .

Pads 245 and 247 are disposed below the light emitting chip 200A, and the pads 245 and 247 include first and second pads 245 and 247 . The first and second pads 245 and 247 are disposed to be spaced apart from each other under the light emitting chip 200A. The first pad 245 is electrically connected to the first conductive semiconductor layer 222 , and the second pad 247 is electrically connected to the second conductive semiconductor layer 224 . The first and second pads 245 and 247 may have polygonal or circular bottom shapes, or may be formed to correspond to the shapes of the first and second lead electrodes 415 and 417 of the circuit board 400 . The area of the lower surface of each of the first and second pads 245 and 247 may be formed to correspond to the size of the upper surface of each of the first and second lead electrodes 415 and 417, for example.

The light emitting chip 200A may include at least one of a buffer layer (not shown) and an undoped semiconductor layer (not shown) between the substrate 221 and the light emitting structure 225 . The buffer layer is a layer for mitigating a difference in lattice constant between the substrate 221 and the semiconductor layer, and may be selectively formed from group II to group VI compound semiconductors. An undoped group III-V compound semiconductor layer may be further formed under the buffer layer, but is not limited thereto. The substrate 221 may be removed. When the substrate 221 is removed, the phosphor layer 250 may contact the top surface of the first conductive type semiconductor layer 222 or another semiconductor layer.

The light emitting chip 200A includes first and second electrode layers 241 and 242 , a third electrode layer 243 , and insulating layers 231 and 233 . Each of the first and second electrode layers 241 and 242 may be formed as a single layer or multiple layers, and may function as a current diffusion layer. The first and second electrode layers 241 and 242 include a first electrode layer 241 disposed under the light emitting structure 225; and a second electrode layer 242 disposed under the first electrode layer 241 . The first electrode layer 241 diffuses current, and the second electrode layer 241 reflects incident light.

The first and second electrode layers 241 and 242 may be formed of different materials. The first electrode layer 241 may be formed of a light-transmitting material, for example, metal oxide or metal nitride. The first electrode layer may be, for example, ITO (indium tin oxide), ITON (ITO nitride), IZO (indium zinc oxide), IZON (IZO nitride), IZTO (indium zinc tin oxide), IAZO (indium aluminum zinc oxide), IGZO ( It may be selectively formed from indium gallium zinc oxide), indium gallium tin oxide (IGTO), aluminum zinc oxide (AZO), antimony tin oxide (ATO), and gallium zinc oxide (GZO). The second electrode layer 242 may contact the lower surface of the first electrode layer 241 and function as a reflective electrode layer. The second electrode layer 242 includes a metal such as Ag, Au or Al. The second electrode layer 242 may partially contact the lower surface of the light emitting structure 225 when a portion of the first electrode layer 241 is removed.

As another example, the structure of the first and second electrode layers 241 and 242 may be stacked in an omni-directional reflector layer (ODR) structure. The non-directional reflective structure may be formed as a laminated structure of a first electrode layer 241 having a low refractive index and a second electrode layer 242 made of a highly reflective metal material contacting the first electrode layer 241 . The electrode layers 241 and 242 may have, for example, a stacked structure of ITO/Ag. An all-directional reflection angle at the interface between the first electrode layer 241 and the second electrode layer 242 may be improved.

As another example, the second electrode layer 242 may be removed and may be formed of a reflective layer made of a different material. The reflective layer may be formed of a distributed bragg reflector (DBR) structure, and the distributed bragg reflector structure includes a structure in which two dielectric layers having different refractive indices are alternately disposed, for example, a SiO ₂ layer. , a Si ₃ N ₄ layer, a TiO ₂ layer, an Al ₂ O ₃ layer, and a different MgO layer, respectively. As another example, the electrode layers 241 and 242 may include both a distributed Bragg reflection structure and a non-directional reflection structure, and in this case, the light emitting chip 200A having a light reflectance of 98% or more may be provided. Since light reflected from the second electrode layer 242 is emitted through the substrate 221 in the light emitting chip 200A mounted in the flipped manner, most of the light can be emitted in a vertical upward direction. In addition, the light emitted to the side of the light emitting chip 200A may be reflected to the incident surface area of the optical lens by the reflective sheet 600 .

The third electrode layer 243 is disposed under the second electrode layer 242 and is electrically insulated from the first and second electrode layers 241 and 242 . The third electrode layer 243 is a metal such as titanium (Ti), copper (Cu), nickel (Ni), gold (Au), chromium (Cr), tantalum (Ta), platinum (Pt), tin (Sn) ), silver (Ag), and phosphorus (P). A first pad 245 and a second pad 247 are disposed below the third electrode layer 243 . The insulating layers 231 and 233 block unnecessary contact between the first and second electrode layers 241 and 242, the third electrode layer 243, the first and second pads 245 and 247, and the layers of the light emitting structure 225. The insulating layers 231 and 233 include first and second insulating layers 231 and 233 . The first insulating layer 231 is disposed between the third electrode layer 243 and the second electrode layer 242 . The second insulating layer 233 is disposed between the third electrode layer 243 and the 1/2 pads 245 and 247 . The first and second pads 245 and 247 may include the same material as the first and second lead electrodes 415 and 417 .

The third electrode layer 243 is connected to the first conductive type semiconductor layer 222 . The connection part 244 of the third electrode layer 243 protrudes as a via structure through the lower part of the first and second electrode layers 241 and 242 and the light emitting structure 225 and contacts the first conductive type semiconductor layer 222. do. The connection part 244 may be disposed in plurality. A portion 232 of the first insulating layer 231 extends around the connection portion 244 of the third electrode layer 243 to form the third electrode layer 243 and the first and second electrode layers 241 and 242, the second It blocks electrical connection between the conductive semiconductor layer 224 and the active layer 223. An insulating layer may be disposed on the side of the light emitting structure 225 to protect the side, but is not limited thereto.

The second pad 247 is disposed under the second insulating layer 233 and contacts at least one of the first and second electrode layers 241 and 242 through an open area of the second insulating layer 233. become or connect The first pad 245 is disposed under the second insulating layer 233 and is connected to the third electrode layer 243 through an open area of the second insulating layer 233 . Accordingly, the protrusion 248 of the first pad 247 is electrically connected to the second conductive semiconductor layer 224 through the first and second electrode layers 241 and 242, and the protrusion 246 of the second pad 245 ) is electrically connected to the first conductivity type semiconductor layer 222 through the third electrode layer 243 .

The first and second pads 245 and 247 are spaced apart from each other below the light emitting chip 200A and face the first and second lead electrodes 415 and 417 of the circuit board 400 . The first and second pads 245 and 247 may include polygonal recesses 271 and 273 , and the recesses 271 and 273 are convexly formed in the direction of the light emitting structure 225 . The recesses 271 and 273 may have a depth equal to or smaller than the thickness of the first and second pads 245 and 247, and the depth of the recesses 271 and 273 is equal to or less than that of the first and second pads 245 and 247. can increase the surface area of

Bonding members 255 and 257 are disposed in a region between the first pad 245 and the first lead electrode 415 and in a region between the second pad 247 and the second lead electrode 417 . The bonding members 255 and 257 may include an electrically conductive material, and some of them are disposed in the recesses 271 and 273 . Since the bonding members 255 and 257 of the first and second pads 215 and 217 are disposed in the recesses 271 and 273, the bonding area between the bonding members 255 and 257 and the first and second pads 245 and 247 may be increased. there is. Accordingly, since the first and second pads 245 and 247 and the first and second lead electrodes 415 and 417 are bonded, electrical reliability and heat dissipation efficiency of the light emitting chip 200A can be improved.

The bonding members 255 and 257 may include a solder paste material. The solder paste material includes at least one of gold (Au), tin (Sn), lead (Pb), copper (Cu), bismuth (Bi), indium (In), and silver (Ag). Since the bonding members 255 and 257 directly conduct heat transfer to the circuit board 400 , heat conduction efficiency may be improved compared to a structure using a package. In addition, since the bonding members 255 and 257 are materials having a small difference in coefficient of thermal expansion from the first and second pads 245 and 247 of the light emitting chip 200A, heat conduction efficiency can be improved.

As another example, the bonding members 255 and 257 may include a conductive film, and the conductive film includes one or more conductive particles in an insulating film. The conductive particles may include, for example, at least one of metal, metal alloy, and carbon. The conductive particle may include at least one of nickel, silver, gold, aluminum, chromium, copper, and carbon. The conductive film may include an anisotropic conductive film or an anisotropic conductive adhesive.

An adhesive member, for example, a thermal conductive film may be included between the light emitting chip 200A and the circuit board 400 . The thermally conductive film may be a polyester resin such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or polybutyrene naphthalate; polyimide resin; acrylic resin; styrenic resins such as polystyrene and acrylonitrile-styrene; polycarbonate resin; polylactic acid resin; polyurethane resin; etc. can be used. Further, polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers; vinyl resins such as polyvinyl chloride and polyvinylidene chloride; polyamide resin; sulfone-based resins; polyether-ether ketone resins; allylate-based resins; or at least one of blends of the above resins.

The light emitting chip 200A may improve light extraction efficiency by emitting light through the surface of the circuit board 400 and the side and top surfaces of the light emitting structure 225 . Since the light emitting chip 200A can be directly bonded on the circuit board 400, the process can be simplified. In addition, since the heat dissipation of the light emitting chip 200A is improved, it can be usefully utilized in the lighting field.

The light emitting module according to the embodiment may be applied to light units of various display devices. The light unit includes a structure having one or a plurality of light emitting modules, and may include a 3D display, various lighting lights, traffic lights, vehicle headlights, electronic signboards, and the like.

Features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, and effects illustrated in each embodiment can be combined or modified with respect to other embodiments by those skilled in the art in the field to which the embodiments belong. Therefore, contents related to these combinations and variations should be construed as being included in the scope of the present invention.

In addition, although the above has been described with a focus on the embodiments, these are only examples and do not limit the present invention, and those skilled in the art to which the present invention belongs can exemplify the above to the extent that does not deviate from the essential characteristics of the present embodiment. It will be seen that various variations and applications that have not been made are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention as defined in the appended claims.

100: light emitting element 100A, 110B, 200A: light emitting chip
400A: light emitting module 150,250: phosphor layer
300: optical lens 315: recess
320: entrance surface 310: bottom surface
330: first light exit surface 335: second light exit surface
350: support protrusion
360,361,362,363: side projections
400: circuit board

Claims (17)

bottom side;
a recess convex upward in a center region of the bottom surface;
an incident surface around the recess;
a first light exit surface disposed opposite to the bottom surface and the incident surface and having a curved surface in which a center region corresponding to the recess is convex; and
A second light exit surface connected in a vertical direction between the first light exit surface and the bottom surface;
The recess has a bottom width in the first axis direction and a bottom width in the second axis direction that are different from each other,
The bottom width in the second axial direction is wider than the bottom width in the first axial direction;
The difference between the bottom width in the second axis direction and the bottom width in the first axis direction is 0.5 mm or more and 5 mm or less, the optical lens. According to claim 1,
A length of the bottom surface passing through the bottom center of the recess in the first axial direction is longer than a length of the bottom surface in the second axial direction. According to claim 2,
The ratio of the length of the bottom surface in the second axial direction to the length of the bottom surface in the first axial direction is the ratio of the bottom width of the recess in the first axial direction to the length of the recess in the second axial direction. An optical lens, greater than the ratio of the floor width. According to any one of claims 1 to 3,
The bottom view shape of the recess is an optical lens having an elliptical shape. According to any one of claims 1 to 3,
The recess has one first apex in the first and second axis directions;
A first apex of the recess is adjacent to a second apex of the first light exit surface. According to claim 5,
Wherein the second light exit surface has a convex center region or a flat surface. According to any one of claims 1 to 3,
The bottom surface includes a first edge around the recess and a second edge below the second light exit surface,
A straight line connecting the first edge and the second edge of the bottom surface is inclined with respect to a horizontal axis passing through the first edge,
The first edge of the bottom surface is disposed below a horizontal straight line passing through the second edge,
A lower region of the incident surface is disposed below the horizontal straight line passing through the second edge. According to claim 7,
The bottom surface of the optical lens comprising a curved surface. According to any one of claims 1 to 3,
The optical lens of claim 1 , wherein the second light exit surface includes a surface perpendicular to a first axis horizontal to a center of a bottom of the recess or an inclined surface. According to any one of claims 1 to 3,
and a plurality of support protrusions spaced equally from the bottom center of the recess on the bottom surface. According to any one of claims 1 to 3,
An optical lens comprising a side protrusion protruding outward from the second light exit surface on a part of the second light exit surface. According to any one of claims 1 to 3,
The optical lens of claim 1 , wherein a depth of the recess is greater than a width of a bottom of the recess and is twice or more a width of the second light exit surface. According to claim 12,
The depth of the recess is disposed to be 80% or more of the thickness of the optical lens. a light emitting element that emits light through an upper surface and a plurality of side surfaces;
an optical lens disposed on the light emitting element; and
a circuit board disposed under the optical lens;
The optical lens is a light emitting module comprising any one of claims 1 to 3. According to claim 14,
the light emitting element is disposed in a recess of the optical lens;
The light emitting device is a light emitting module that emits light on five surfaces. According to claim 14,
a fixing plate between the circuit board and the optical lens;
The light emitting module of claim 1 , wherein the fixing plate has an opening in which the light emitting element is disposed, and is adhered to the circuit board. A light unit having the light emitting module of claim 14.

Images