KR20180036272A - Optical lens, light emitting module and light unit having thereof - Google Patents

Abstract

According to an embodiment of the present invention, disclosed are an optical lens and a light source module having the same. According to the embodiment, the optical lens comprises: a bottom surface; a concave recess in a center region of the bottom surface; a first exit surface having a convex curved surface at an opposite side of the bottom surface and the recess; a second exit surface between the bottom surface and the first exit surface; and a side protrusion disposed along a first axial direction of the second exit surface. The bottom surface has a length D1 in a first axial direction and a length D2 in a second axial direction perpendicular to the first axial direction. The bottom of the recess has a length D3 in the first axial direction and a length D4 in the second axial direction. The length of the bottom surface has a relationship of D1 < D2. The bottom length of the recess has a relationship of D3 > D4. The ratio of the length of the bottom surface to the length of the recess can have a relationship of D2/D1 < D3/D4.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical lens, a light source module, and a light unit having the optical lens,

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

BACKGROUND ART Light emitting devices, for example, light emitting diodes (LEDs) are a kind of semiconductor devices that convert electrical energy into light, and have been attracting attention as a next generation light source in place of conventional fluorescent lamps and incandescent lamps.

Since the light emitting diode generates light by using a semiconductor element, the light emitting diode consumes very low power as compared with an incandescent lamp that generates light by heating tungsten, or a fluorescent lamp that generates ultraviolet light by impinging ultraviolet rays generated through high-pressure discharge on a phosphor .

In addition, since the light emitting diode generates light using the potential gap of the semiconductor device, it has a longer lifetime, faster response characteristics, and an environment-friendly characteristic as compared with the conventional light source.

Accordingly, much research has been conducted to replace an existing light source with a light emitting diode, and a light emitting diode has been increasingly used as a light source for various lamps, display devices, display boards, street lamps and the like used in indoor and outdoor.

An embodiment provides an anisotropic optical lens.

Embodiments provide an optical lens having a bottom surface with a different axial length.

Embodiments provide an optical lens having exit surfaces with different axially different lengths.

The embodiment provides an optical lens of different length in two axial directions of the recess disposed in the center of the bottom surface.

The embodiment provides an optical lens in which the ratio of the length of the bottom surface in the two axial directions and the ratio of the length in the two axial directions of the recess are different.

The embodiment provides an optical lens having a recess and a bottom surface of an asymmetrical shape with respect to the bottom center of the recess.

The embodiment provides an optical lens in which the apex of the emission surface is flat or convex.

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

The embodiment provides an optical lens in which a bottom surface with an inclined or curved surface is disposed.

The embodiment provides a light source module in which an optical lens is disposed on a light emitting element.

Embodiments provide a light source module capable of controlling a luminance distribution by changing the emission angle of light emitted to different exit surfaces of an optical lens.

Embodiments provide a light source module capable of preventing the loss of light because the bottom surface of the optical lens is disposed around the light emitting element.

Embodiments provide a light source module in which the bottom surface of an optical lens is arranged on an inclined surface or a curved surface to improve the luminance distribution in the center portion.

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

The embodiment provides the light source module in which the side projection of the optical lens protrudes outward beyond the exit surface of the optical lens.

An embodiment provides a light unit having a light source module in which an arm portion of a corner region of a bottom cover is removed by an anisotropic optical lens.

 An optical lens according to an embodiment includes: a bottom surface; A concave recess in the center region of the bottom surface; And a first emitting surface having a convex curved surface on the opposite side of the bottom surface and the recess, wherein the bottom surface has a length D1 in a first axis direction and a length in a second axis direction perpendicular to the first axis direction The length of the recess in the first axial direction is D3, the length in the second axial direction is D4, and the length of the recess has a relationship of D1 < D2, The bottom length has a relationship of D3 > D4, and the ratio of the length of the bottom surface and the length of the recess may have a relationship of D2 / D1 < D3 / D4.

A light source module according to an embodiment includes a circuit board; At least one light emitting element on the circuit board; And at least one optical lens on the light emitting element, wherein the optical lens has: a bottom surface on the circuit board; A concave recess in the center region of the bottom surface; And a first emitting surface having a convex curved surface on the opposite side of the bottom surface and the recess, wherein the bottom surface has a length D1 in a first axis direction and a length in a second axis direction perpendicular to the first axis direction The length of the recess in the first axial direction is D3, the length in the second axial direction is D4, and the length of the recess has a relationship of D1 < D2, The bottom length has a relationship of D3 > D4, and the ratio of the length of the bottom surface and the length of the recess may have a relationship of D2 / D1 < D3 / D4.

A light unit according to an embodiment includes a bottom cover having a storage area; A circuit board disposed on the bottom cover in a first axial direction; A plurality of light emitting elements arranged in a first axis direction of the circuit board; And a plurality of optical lenses disposed on each of the light emitting elements, wherein the plurality of optical lenses are arranged in one row in a first axis direction in the bottom cover, and each of the optical lenses has a bottom surface ; A concave recess in the center region of the bottom surface; And a first emitting surface having a convex curved surface on the opposite side of the bottom surface and the recess, wherein the bottom surface has a length D1 in a first axis direction and a length in a second axis direction perpendicular to the first axis direction The length of the recess in the first axial direction is D3, the length in the second axial direction is D4, and the length of the recess has a relationship of D1 < D2, The bottom length has a relationship of D3 > D4, and the ratio of the length of the bottom surface and the length of the recess may have a relationship of D2 / D1 < D3 / D4.

According to the embodiment, a second emission surface having a plane between the first emission surface and the bottom surface may be included.

According to the embodiment, of the region of the second exit surface, the side surface protruding portion may protrude from the second exit surface on the outer side in the first axial direction.

According to the embodiment, the thickness of the second emission surface may be equal to or thicker than the thickness of the side projection.

According to the embodiment, the bottom surface may have different heights of the first edge adjacent to the recess and the second edge of the outermost edge.

According to an embodiment, the bottom surface may comprise at least one of curved and inclined surfaces between the first edge and the second edge.

According to the embodiment, the height of the recess may be greater than the length of the recess in the first axial direction.

According to the embodiment, the height of the recess may be smaller than the length in the first axial direction of the recess and larger than the length in the second axial direction.

According to the embodiment, the thickness of the second exit surface in the first axial direction may be different from the thickness of the second exit surface in the second axial direction.

According to the embodiment, the thickness of the second exit surface in the first axis direction may be thinner than the thickness in the second axis direction.

According to the embodiment, the thickness of the first exit surface may become gradually thicker from the first axis direction toward the second axis direction.

According to the embodiment, the bottom surface has a plurality of support protrusions, and the length in the first axial direction or the length in the second axial direction between the plurality of support protrusions is the length of the recess in the first axial direction, Direction than the length of the direction.

According to an embodiment, the bottom view shape of the recess may have an elliptical shape.

According to an embodiment of the present invention, the recess has a first vertex converging with respect to the first and second axial directions, and a first vertex of the recess has a second vertex of the recess, Respectively.

According to the embodiment, the second exit surface may have a curved surface or a flat surface having a convex center region.

According to the embodiment, the length of the circuit board in the first axial direction is longer than that of the second axial direction in the top view, and the length of the optical lens in the second axial direction is the length in the second axial direction of the circuit board Can be longer.

According to an embodiment of the present invention, there is provided an optical lens having a plurality of support protrusions coupled to the circuit board and disposed on a bottom surface of the optical lens, wherein a length in the first axial direction or a length in the second axial direction, The length in the first axial direction or the length in the second axial direction.

According to an embodiment of the present invention, the light emitting device may include an LED chip that emits light through an upper surface and a plurality of side surfaces.

The embodiment can provide an optical lens having different luminance distribution in different axial directions.

Embodiments can reduce the number of optical lenses.

The embodiment can reduce noise such as hot spot caused by light extracted from the optical lens.

Embodiments can reduce interference between optical lenses disposed on a circuit board.

The embodiment can reduce the number of light emitting elements and optical lenses disposed in the light unit.

The embodiment can provide a light unit for a display device having a bar-shaped light source module.

The embodiment can improve the reliability of the light source module having the optical lens and the light unit.

Embodiments can improve the image by minimizing interference between adjacent optical lenses.

Embodiments can improve the reliability of an illumination system having a light source module.

1 is a plan sectional view of an optical lens according to the first embodiment.
Fig. 2 is a bottom view of the optical lens of Fig. 1;
Fig. 3 is a first side view of the optical lens of Fig. 1 in the X-axis direction. Fig.
Fig. 4 is a second side view of the optical lens of Fig. 1 in the Y-axis direction. Fig.
5 is a cross-sectional view of the optical lens of Fig. 1 on the AA side.
6 is a cross-sectional view of the optical lens of Fig. 1 on the BB side.
7 is a side sectional view in the Y axis direction of the optical lens as a second embodiment.
8 is a sectional view of the optical lens in the X-axis direction as a second embodiment.
9 is a side sectional view in the Y axis direction of the optical lens according to the third embodiment.
10 is a side sectional view in the X-axis direction of the optical lens according to the third embodiment.
11 is a modification of the optical lens of Fig.
12 is a modification of the optical lens of Fig.
13 is a view showing a light source module having an optical lens according to an embodiment.
14 is a GG side sectional view of the light source module of Fig.
15 is a sectional view on the HH side of the light source module of Fig.
16 is a plan view showing a light unit having the light source module of Fig.
17 is a view showing an example of a light emitting device of the light source module of FIG.
18 is a view showing another example of the light emitting device of the light source module of FIG.
19 is a view showing another example of the light emitting element of the light source module of FIG.
20 is a view showing a radiation pattern of the light source lens of FIG.
FIG. 21 is a diagram showing the luminance distribution of the light source lens of FIG. 1; FIG.
22 is a view showing a radiation pattern of the optical lens of Figs. 7 and 8. Fig.
23 is a diagram showing the luminance distribution of the optical lenses of Figs. 7 and 8. Fig.
Fig. 24 is a diagram showing the luminance distribution in the second axial direction according to the depth variation of the recess of the optical lens of Fig. 1;
25 is a view showing a luminance distribution in the first axial direction in accordance with the depth variation of the recess of the optical lens of FIG.
Fig. 26 is a view showing a color difference distribution in the second axial direction according to the depth variation of the recess of the optical lens of Fig. 1; Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the description of the embodiments, it is to be understood that each layer (film), area, pattern or structure may be referred to as being "on" or "under / under" Quot; on "and" under "as used herein are intended to refer to all that is" directly "or" indirectly " . In addition, the criteria for the top / bottom or bottom / bottom of each layer are described with reference to the drawings.

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

1 is a bottom view of the optical lens of Fig. 1, Fig. 3 is a first side view in the X-axis direction of the optical lens of Fig. 1, and Fig. 4 is a cross- FIG. 5 is a cross-sectional view of the optical lens of FIG. 1 taken along the line AA, and FIG. 6 is a cross-sectional view of the optical lens of FIG. 1 taken along the line BB of FIG.

1 to 6, the optical lens 300 includes a bottom surface 310, a concave recess 315 in the center of the bottom surface 310, and a bottom surface 310, 315 having a curved surface. In the optical lens 300, the surface of the recess 315 may be an incident surface 320.

The optical lens 300 may have a first length D1 in the first axial direction X and a second length D2 in the second axial direction Y different from each other. The first axis direction may be a direction orthogonal to the second axis direction, and the vertical direction orthogonal to the first and second axis directions may be a third axis direction (Z). In the optical lens 300, the first length D1 and the second length D2 may be the maximum lengths in the respective axial directions. The first length D1 and the second length D2 of the optical lens 300 may be the lengths of the bottom surface 310 in the respective axial directions. The first length D1 and the second length D2 of the optical lens 300 may be the maximum lengths in the respective axial directions of the first exit surface 330. [ The first length D1 and the second length D2 may have a relationship of D1 < D2. The difference between the lengths D1 and D2 may be in the range of 1 mm or more, for example, 1 mm to 3.5 mm. The optical lens 300 according to the embodiment has a length longer than the X-axis length in the Y-axis direction, so that the light output area in the X-axis direction can be widened.

The optical lens 300 may include a light-transmitting material. The optical lens 300 may include at least one of polycarbonate (PC), polymethyl methacrylate (PMMA), silicon 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 may have an elliptical outer shape. The bottom surface 310 may have a shape symmetrical with respect to the X-axis direction passing through the bottom center P0, and symmetrical with respect to the Y-axis direction. A straight line horizontal to the first axis X direction is X0 and a straight line horizontal to the second axis Y direction is Y0 with respect to the bottom center P0.

Has a recessed recess 315 in the central region of the bottom surface 310 and the surface of the recess 315 may be the incident surface. The optical lens 300 may be defined as a central axis Z0 in the Z axis direction perpendicular to the bottom center P0 of the recess 315. [ The bottom center P0 of the recess 315 may be the lower center of the optical lens 300 or the center of the bottom surface 310 and may be defined as a reference point. The bottom surface 310 may be disposed around the recess 315.

The bottom surface 310 includes a sloped surface or a curved surface with respect to a horizontal straight line X0 in the X-axis direction and a horizontal second straight line Y0 in the Y-axis direction with respect to the bottom center PO Or both inclined and curved surfaces. The bottom surface 310 may have a flat area adjacent to the recess 315 and a sloped area adjacent to the outer edge. The bottom surface 310 may include an inclined surface or a curved surface having a gradually higher height from the recess 315 toward the outer edge. The recess 315 is recessed or recessed upward from the central region of the bottom surface 310.

The bottom surface 310 of the optical lens 300 includes a first edge 23 adjacent the recess 315 and a second edge 25 adjacent the second exit surface 335. The first edge 23 is a boundary region between the incident surface 320 and the bottom surface 310 and may include a low point region 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 disposed lower than the position of the second edge 25 with respect to the first horizontal straight line XO and the second straight line Y0. The first edge 23 may cover a 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 exit surface 335. The second edge 25 may be a boundary region between the bottom surface 310 and the second 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 emission surface 335. The first edge 23 may be an inner edge or a curved surface. The second edge 25 may comprise an outer edge or a curved surface. The first edge 23 and the second edge 25 may be opposite ends of the bottom surface 310. The first edge 23 may have a bottom view shape of a circle or an ellipse, and the second edge 25 may have a bottom view shape of a circle or an ellipse.

The distance between the first straight line X0 and the second straight line Y0 may be gradually narrower as the bottom surface 310 is closer to the first edge 23. [ The distance between the horizontal straight line X0 and the second straight line Y0 may gradually increase as the bottom surface 310 is further away from the first edge 23. [ The second edge 25 on the bottom surface 310 has a maximum distance from the first straight line X0 and the second straight line Y0 and the first edge 23 has the first straight line X0 And the second straight line Y0 may be minimum. 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 inclined surfaces and curved surfaces. The bottom surface 310 may gradually become farther toward the outer side with respect to the first straight line X0 and the second straight line Y0 so that the bottom surface 310 may be an all-reflecting surface when viewed from the recess 315. [ For example, if any light source is disposed on the bottom of the recess 315 in the recess 315, the bottom surface 310 may provide a sloped surface. Since the bottom surface 310 reflects light incident through the recess 315, the loss of light can be reduced. Further, the light incident directly on the bottom surface 310 can be removed without passing through the incident surface 320. The optical lens 300 can increase the amount of light incident on the reflecting surface 310 through the incident surface 320 and improve the directivity angle distribution.

The bottom surface 310 becomes lower as it is closer to the first edge 23 of the recess 315 so that it can be gradually closer to the first straight line X0 and the second straight line Y0. Thus, the area of the bottom surface 310 can be increased. The area of the incident surface 320 of the recess 315 may be wider as the bottom surface 310 is lowered. The depth of the recess 315 is the height from the first edge 23, so that it can be deeper. By increasing the area of the bottom surface 310, the reflection area can be increased. The bottom of the recess 315 becomes lower, so that the floor area can be increased.

The first edge 23 of the bottom surface 310 is disposed on a first straight line X0 and a second straight line Y0 that are horizontal to the bottom of the recess 315, Are spaced apart from the first straight line X0 and the second straight line Y0 by a predetermined distance. The gap between the second edge 25 and the first straight line X0 or second straight line Y0 may provide a sloped surface to reflect light incident on the lower region 22 of the incident surface 320 It can be a distance. The lower region 22 of the incident surface 320 may be a region between the lower edge of the incident surface 320 and the first edge 23 where a horizontal line crosses the second edge 25.

The distance between the second edge 25 and the first straight line X0 or the second straight line Y0 may be 500 탆 or less, for example, 450 탆 or less. The distance between the second edge 25 and the first straight line X0 or the second straight line Y0 may be in the range of 200 to 450 占 퐉. If the distance is smaller than the range, ) May be lowered to cause a problem of interference of the light emitted to the second exit surface 335. When the second exit surface 335 is larger than the above range, the high exit point of the second exit surface 335 becomes higher, There is a problem that the curvature of the optical lens 300 is changed and the thickness D5 of the optical lens 300 is increased.

The bottom surface 310 may be 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 from the bottom center PO. As another example, at least one of the plurality of support protrusions 350 may be disposed at a different distance from the bottom center PO. The plurality of support protrusions 350 may have a distance D13 between support protrusions arranged in the X-axis direction greater than a distance D12 between support protrusions arranged in the second axis Y direction. D13 may be 1.5 times or more, for example, 2 times or more than D12. The distance D12 among the plurality of support protrusions 350 can be the width of the circuit board on which the optical lenses are arranged and thus the optical lens 300 can be stably supported without increasing the width of the circuit board.

The bottom view shape of the bottom surface 310 may include an elliptical shape. The length of the bottom surface 310 may be different between the first length D1 in the X-axis direction and the second length D2 in the Y-axis direction. The first length D1 may be the length of the bottom surface 310 in the X axis direction and the second length D2 may be the length of the bottom surface 320 in the Y axis direction. The first length D1 may be the maximum length in the X axis direction of the first exit surface 330 and the second length D2 may be the maximum length in the Y axis direction of the first exit surface 330 . D1 is the maximum length in the X-axis direction of the optical lens, and D2 is the maximum length in the Y-axis direction. The second length D2 and the first length D1 may have a relationship of D2 > D1. The ratio of D2 / D1 may be in the range of 101% or more, for example, 101 to 110%. D2 may be 0.5 mm or more, for example, 1 mm or more larger than D1. The ratio of the length ratio (D1: D2) may range from 1: 1.01 to 1: 1.1. Since the first exit surface 330 of the optical lens 300 has the maximum length in the Y-axis direction, the exit area in the X-axis direction or the diagonal direction perpendicular to the Y-axis direction can be increased.

2, the bottom shape of the recess 315 may include an elliptical shape. 3 to 6, the recess 315 may include a bell shape, a shell shape, or an elliptical shape at a side end face. The recess 315 may have a shape in which the width gradually becomes narrower as it goes up. The recess 315 may have a shape gradually converging from the first edge 23 around the bottom toward the first apex 21 at the top. If the bottom view of the recess 315 is elliptical, the diameter may be gradually reduced toward the first vertex 21. The recess 315 may be provided symmetrically with respect to the central axis Z0 in the X-axis direction or in a shape symmetrical in the Y-axis direction. The first vertex 21 of the incident surface 320 may be provided in a dot shape or a line shape.

In view of the bottom width of the recess 315, the width D3 in the X-axis direction may be different from the width D4 in the Y-axis direction. For example, the width D3 in the X-axis direction may be larger than the width D4 in the Y-axis direction. The bottom width of the recess 315 satisfies the relationship of D3 > D4, and the difference may be 0.5 mm or more and 5 mm or less, e.g., 1 mm or more and 2 mm or less. The width D3 may be four times or less, for example, two times or less than D4. The ratio D4: D3 of the bottom width of the recess 315 may have a difference in the range of 1: 1.1 to 1: 2. The luminance distribution in the X-axis direction and the diagonal direction orthogonal to the Y-axis length can be improved according to the bottom ratio of the recesses 315.

The bottom widths D3 and D4 of the recess 315 may have a width at which a light source, that is, a light emitting device described later, can be inserted. The bottom widths D3 and D4 of the recess 315 may be three times or less the width of the light emitting device, for example, 2.5 times or less. The bottom width D3 and D4 of the recess 315 may be in the range of 1.2 to 2.5 times the width of the light emitting element. If the light emitting element is smaller than the range, It is possible to provide light loss or optical interference through the region between the light emitting element and the first edge 23.

The supporting protrusions 350 on the bottom surface 310 may have a relationship of D12 &gt; D4 when D12 &lt; D13, and D13 > D3. The ratio of D12 / D4 is g1, and the ratio of D13 / D3 is g2, g1 < g2. This can stably fix and support the optical lens 300 arranged in the X-axis direction on the circuit board and reduce the optical loss.

The ratio of the length D2 / D1 of the bottom surface 310 or the first light output surface 330 to the length D2 / D1 of the optical lens 300 according to the embodiment is a and the length / length of the recess 315 If the ratio of D3 / D4 is b, then a < b can be satisfied. The b may be provided in a range of 110% or more, such as 110% to 140% of a. This is because the incidence surface of the recess 315 in the asymmetric optical lens is provided wider than the symmetrical lens, so that the light can be diffused and provided to a wider range. Accordingly, the optical lens 300 can secure the luminance distribution in the Y-axis direction due to the difference in external length, and can diffuse widely in the X-axis direction and the edge area by the recess 315 in terms of luminance distribution have. Accordingly, the number of bars of the light source module in which the optical lens 300 is arranged can be reduced to two or less, for example, one, and the luminance distribution of the upper and lower corner portions in the backlight unit can be improved.

The incident surface 320 has a curved surface convex upward from the center area of the bottom surface 310 and may be a circumferential surface or an inner surface of the recess 315. The incidence plane 320 may gradually move away from the bottom center P0 of the recess 315 as the distance increases. Since the incident surface 320 is provided with a convex curved surface, the light can be refracted in the entire area. The lower region 22 of the incident surface 320 is disposed at a position lower than the second exit surface 335 so that light can be incident directly or indirectly. 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 of a rotating body having a Bezier curve. The curved line of the incident surface 320 may be a spline, cubic, B-spline, or T-spline, for example. 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 may include a first exit surface 330. The first exit surface 330 may be the opposite side of the recess 315 and the bottom surface 310 with respect to the lens body. The first exit surface 330 may be the opposite side of the incident surface 320 and the bottom surface 310. The first exit surface 330 includes a curved surface. The first exit surface 330 may have a second vertex 31 corresponding to the center axis Z0 and the second vertex 31 may be a vertex of the lens body. The first exit surface 330 may include a convex curved surface. The first exit surface 330 may be formed as a curved surface having a curvature, for example, a curvature having a different positive curvature. The first exit surface 330 may have an axisymmetric shape, for example, an X-axis or a Y-axis symmetrical shape with respect to the central axis Z0. The center side first regions A1 and A2 adjacent to the second vertex 31 on the second exit surface 335 may not have a negative curvature. The first regions A1 and A2 adjacent to the second vertex 31 on the second exit surface 335 may have different radii of curvature. The second regions A3 and A4, which are the outer side regions of the first regions A1 and A2, may be formed as curved surfaces having different radii of curvature.

The first exit surface 330 may gradually increase as the distance from the bottom center P0 of the recess 315 is further away from the central axis Z0. The center of gravity Z0 of the first exit surface 330 may have a slope or a slight slope difference with respect to a horizontal axis as it is adjacent to the second vertex 31. [ That is, the center-side first areas A1 and A2 of the first exit surface 330 may include a gentle curve or a straight line. The first regions A1 and A2 of the first exit surface 330 may include an area vertically overlapping the recess 315. [ The side second regions A3 and A4 of the first exit surface 330 may have a curved surface that is more abrupt than the first regions A1 and A2. Since the first exit surface 330 and the entrance surface 320 have a convex curved surface, the first exit surface 330 and the entrance surface 320 can be diffused in a lateral direction with respect to the light emitted from the bottom center PO of the recess 315. The angle at which the light is refracted may become larger as the first exit surface 330 and the incident surface 320 are away from the central axis Z0 in an angular range within 70 占 from the central axis Z0 .

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

The inclination of the first exit surface 330 may be smaller than the inclination of the incident surface 320. The first exit surface 330 of the optical lens 300 increases in monotonous as the distance from the central axis Z0 is increased in the directing angle and the second exit surface 335 has a light directing angle And the forging is the same or decreases as the distance increases with respect to the central axis Z0.

The optical lens 300 may include a second exit surface 335 between the first exit surface 330 and the bottom surface 310. The second exit surface 335 may be disposed at a position higher than the first straight line X0 and the second straight line Y0 which are horizontal to the bottom of the recess 315. [ The second exit surface 335 may be a flat surface or a sloped surface, and may be defined as a flange, but is not limited thereto. The second exit surface 335 may be disposed perpendicular or inclined to the first horizontal straight line X0 and the second straight line Y0. The second exit surface 335 may extend vertically or obliquely from the outline of the first exit surface 330. The second exit surface 335 includes a third edge 35 adjacent to the first exit surface 330 and the third edge 35 is substantially identical to the outline of the first exit surface 330 Or may be located inside or outside of the outline line of the first exit surface 330.

A straight line connecting the third edge 35 of the second exit surface 335 and the center axis Z0 is formed in a line from the center axis Z0 to the center axis Z0 with respect to the bottom center P0 of the recess 315. [ Can be located at an angle of less than +/- 2 degrees. The third edge 35 of the second exit surface 335 is inclined relative to the horizontal first line X0 and the second axis YO with respect to the bottom center P0 of the recess 315 For example, at an angle of 16 +/- 2 degrees. The angle between the second edge 25 and the third edge 35 of the second exit surface 335 at the bottom center P0 of the recess 315 is not more than 16 degrees, Lt; / RTI &gt; The angle of the second exit surface 335 with respect to a straight line passing through the third edge 35 is an external angle of the optical lens 300. The second exit surface 335 can emit light by refracting light incident in a region spaced from the first straight line X0 and the second straight line YO. The light refracted by the second exit surface 335 may be emitted at an angle smaller than the angle before refraction with respect to the central axis Z0. Thus, the second exit surface 335 can suppress the refracted light from being radiated in a direction lower than the horizontal axis or the horizontal axis, and can prevent interference with adjacent optical members or loss of light.

In the boundary region between the first exit surface 330 and the second exit surface 335, the angle at which the light is refracted can be reduced and can be reduced to, for example, an angle range of 2 degrees or less. This is because the surface of the first exit surface 330 closer to the second exit surface 335 may be provided as a tangential line or a perpendicular plane, so that the angle at which the light is refracted may be gradually reduced.

A straight line passing through the center axis Z0 and the second edge 25 of the bottom surface 310 is formed so that the angle? 1 with respect to the first straight line X0 or the second straight line YO is 5 degrees or less, And may be in the range of 0.4 to 4 degrees. The angle? 1 may vary depending on the distance from the central axis Z0 and the height of the second edge 25, and when the distance is out of the range, the thickness of the optical lens may be changed and the loss of light may be increased . The second exit surface 335 refracts light that is out of the half-angle from the center axis Z0 with respect to the bottom center P0 of the recess 315, thereby reducing light loss.

The lengths D1 and D2 of the optical lens 300 may be larger 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 of the thickness D5. The first length D1 may be in a range of 15 mm or more, for example, 16 mm to 28 mm, and the second length D2 may be in a range of 16 mm or more, for example, 17 mm to 32 mm. The thickness D5 may be in the range of 6.5 mm or more, for example, 6.5 mm to 10 mm or less. When the ratio of D5 / D1 is c and the ratio of D5 / D2 is d, c and d are not less than 0.3, and c> d. Since the lengths D1 and D2 of the optical lens 300 are arranged to be larger than the thickness D5, it is possible to provide a uniform luminance distribution over the entire area of the illumination device and the light unit. Further, 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 an interval from the bottom center PO to the first apex 21. Here, the first vertex 21 may be the apex of the incident surface 320 or the 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 0.75 or more, for example, 0.8 or more of the thickness D5 of the optical lens 300. The depth D8 of the recess 315 may be 0.8 or more of the distance between the second vertex 31 of the first exit surface 330 and the bottom center PO or the first edge 23. The recess 315 may have a relationship of e > f when the ratio of D3 / D8 is e and the ratio of D4 / D8 is f. The depth D8 of the recess 315 is deep so that even though the center area of the first exit surface 330 does not have an antireflection or negative curvature, It is possible to diffuse the light in the lateral direction even in the adjacent region. Since the recess 315 has a deep depth D8, the incidence plane 320 can reflect light incident on the peripheral region of the first vertex 21 in a region close to the second vertex 31, As shown in FIG.

The minimum distance D9 between the recess 315 and the first exit surface 330 is smaller than the distance between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first exit surface 330 ). &Lt; / RTI &gt; The distance D9 may be 3 mm or less, for example, in the range of 0.6 mm to 3 mm or in the range of 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 exit surface 330 is 3 mm or more, the first area of the first exit surface 330 A1 and A2 and the second areas A3 and A4 may be large, and the 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 exit surface 330 is less than 0.6 mm, There is a problem to be solved. By arranging the distance D9 between the recess 315 and the first exit surface 330 within the above range, the first areas A1 and A2 of the second exit surface 335 can be inclined to the full- The light path can be diffused in the outward direction even if it has no curvature. This is because the first vertex 21 of the incident surface 320 is closer to the convex second vertex 31 of the first exit surface 330 than to the side of the first exit surface 330 through the entrance surface 320 The light amount of the light traveling in the direction of the arrow can 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 positioned at a second vertex (center) of the first exit surface 330 rather than a straight line extending horizontally from the third edge 35 of the second exit surface 335 Lt; RTI ID = 0.0 &gt; 31). &Lt; / RTI &gt;

The width D7 of the second exit surface 335 is a straight line distance between the second edge 25 and the third edge 35 and may be less than the depth D8> D7 of the recess 315 . The ratio of D8 / D7 may be 3 or more, for example, 4 or more. The ratio of D5 / D7 may be 4 or more, for example, 4.5 or more. The width D7 of the second exit surface 335 may range, for example, from 1.5 mm to 2.3 mm. When the width D7 of the second exit surface 335 exceeds the above range, the amount of light emitted to the second exit surface 335 is increased to make it difficult to control the light distribution. If the width D7 is smaller than the above range, It may be difficult to secure a gate region.

5 and 6, the first regions A1 and A2 of the first exit surface 330 are regions overlapping the recesses 315 vertically, For example, 14 degrees to 18 degrees from the central axis Z0. The radius of the recess 315 becomes larger when the first regions A1 and A2 of the first exit surface 330 exceed the angular range, There is a problem that the light amount difference between the second regions A3 and A4 becomes large. Further, when the first areas A1 and A2 of the first exit surface 330 are smaller than the angular range, the radius of the recess 315 may be further reduced, so that the insertion of the light source may not be easy, The light distribution of the first areas A1 and A2 and the second areas A3 and A4 may not be uniform.

The second exit surface 335 of the optical lens 300 is disposed on the lower periphery of the first exit surface 330 and the bottom surface 310 is located on the second edge 25 of the second exit surface 335, May be disposed below. The bottom surface 310 may protrude below the horizontal line of the second edge 25 of the second exit surface 335.

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

The optical lens 300 according to the embodiment may be arranged on the circuit board 400 at predetermined intervals in the Y axis direction, as shown in FIG. Since the width (D4 < D3) of the recess 315 is arranged in the wide Y-axis direction, as shown in Figs. 2, 5 and 6, The number of the lenses 300 can be reduced and the luminance distribution in the X-axis direction or the XY diagonal direction can be improved by the asymmetric structure of the recesses 315.

When the light emitting device is disposed below the optical lens of Figs. 5 and 6, the light source module as shown in Figs. 14 and 15 can be realized. In this case, the light emitting device 100 is disposed at the recess 315 of the optical lens 300 and emits light, and the emitted light is refracted at the incident surface 320 and transmitted through the first exit surface 330 Can be released. Some light emitted through the incidence surface 320 may be emitted through the second exit surface 335. In the optical lens according to the first embodiment, light refracted through the first and second exit surfaces 330 and 335 can be emitted upward and laterally of the optical lens 300. That is, the optical lens 300 may refract the incident light such that the incident light is emitted upward rather than a straight line on the bottom surface. 20 and 21, the directivity angle distribution in the X-axis direction may be larger than the directivity angle distribution in the Y-axis direction. For example, the directivity angle distribution in the X-axis direction may be higher than the directivity angle distribution in the Y-axis direction by at least 1 degree, for example, 1 degree to 5 degrees. The half-value width FWHM of the directivity angle distribution in the Y-axis direction may be 10 degrees or less, and the center intensity may be 5% or less.

The optical lens according to the first embodiment can compare the light emitted to the exit surface with the amount of light traveling on a straight line that is horizontal to the apex of the optical lens is larger than the amount of light traveling below the straight line that is horizontal to the apex.

Meanwhile, the optical lens 300 according to the embodiment may include a side projection 360. [ The side projecting portion 360 may be disposed on a part of the surface of the emitting surface, for example, the second emitting surface 335. The side protrusion 360 can function as a gate at the time of injection. The side protrusions 360 may be disposed in at least one of the X axis direction and the Y axis direction. The side surface protrusion 360 may protrude from the second exit surface 335 in the X-axis direction. The height (or thickness) of the side surface projection 360 may be equal to or less than the vertical width (or height) D7 of the second exit surface 335. [ The side protrusions 360 are arranged in the X-axis direction, so that the liquid lens body to be injected is dispersed due to the structure of the recess 315 having a long bottom width D3 in the X-axis direction.

Fig. 7 is a side sectional view in the Y-axis direction of the optical lens according to the second embodiment, and Fig. 8 is a side sectional view in the X-axis direction of the optical lens according to the second embodiment. In describing the second embodiment, description of the same portions as those of the first embodiment will be omitted. The optical lenses of Figs. 7 and 8 refer to the plan view and the rear view of Fig. 1 and Fig. 2, respectively. In the first embodiment, the length and the thickness of the optical lens, and the length and depth of the recess are changed.

7 and 8, the optical lens according to the second embodiment includes a bottom surface 310, a recess (not shown) recessed upward from the bottom surface 310 in a central region of the bottom surface 310 315), a bottom surface (310) and a first exit surface (330) disposed on the opposite side of the recess (315). The optical lens may include a second exit surface 335 between the first exit surface 330 and the bottom surface 310. The optical lens according to the second embodiment will be described with respect to parts different from the optical lens according to the first embodiment.

The bottom surface 310 of the optical lens 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. These supporting protrusions 350 will be referred to the first embodiment.

The optical lens of Figs. 7 and 8 emits light upwardly and laterally through the first and second exit planes 330 and 335, and the light emitted through the first and second exit planes 330 and 335 passes through the optical lens &lt; RTI ID = More light can be emitted in the downward direction than in the upward direction with respect to the horizontal straight line at the apex of the vertex. This is because the optical lens of the second embodiment irradiates a larger amount of light laterally and can be provided to the side emission lens, unlike the optical lens of the first embodiment irradiating more light quantity in the upward direction.

The bottom view shape of the bottom surface 310 may include an elliptical shape. The length of the bottom surface 310 or the first exit surface 330 may be different from the first length D1 in the X-axis direction and the second length D2 in the Y-axis direction. The first length D1 may be a length in the X axis direction of the optical lens 300 and the second length D2 may be a length in the Y axis direction. The first length D1 may be longer than the second length D2 and the first length D1 may be larger than the second length D2 by 1 mm or more, for example, 2 mm or more. The length satisfies the condition of D2 > D1, and the ratio of the length ratio (D1: D2) may be in the range of 1: 1.08 to 1: 1.4. The optical lens 300 according to the embodiment is arranged such that the second length D2 is longer than the first length D1, so that the luminance distribution in the X-axis direction can be prevented from being reduced.

The bottom shape of the recess 315 may include an elliptical shape. As shown in FIGS. 8 and 9, the recess 315 may have a bell shape, a shell shape, or an elliptical shape. The recess 315 may have a shape in which the width gradually becomes narrower as it goes up. The recess 315 may have a shape gradually converging from the first edge 23 around the bottom toward the first apex 21 at the top. If the bottom view of the recess 315 is elliptical, the diameter may be gradually reduced toward the first vertex 21. The recess 315 may be provided axially symmetrically with respect to the center axis Z0. The first vertex 21 of the incident surface 320 may be provided in a dot shape.

The bottom widths D3 and D4 of the recess 315 may have a width at which a light source, that is, a light emitting device described later, can be inserted. The bottom widths D3 and D4 of the recess 315 may be three times or less the width of the light emitting device, for example, 2.5 times or less. The bottom width D3 and D4 of the recess 315 may be in the range of 1.2 to 2.5 times the width of the light emitting element. If the light emitting element is smaller than the range, It is possible to provide light loss or optical interference through the region between the light emitting element and the first edge 23.

In view of the bottom width of the recess 315, the width D3 in the X-axis direction may be different from the width D4 in the Y-axis direction. For example, the width D3 in the X-axis direction may be larger than the width D4 in the Y-axis direction. The bottom width of the recess 315 satisfies the condition of D3 > D4, and the difference may have a difference of 1.5 mm or more and 5 mm or less, e.g., 1.5 mm to 5 mm. The width D3 may be less than or equal to twice D4. The ratio D4: D3 of the bottom width of the recess 315 may have a difference in the range of 1: 1.3 to 1: 1.8. When the width D4 in the Y-axis direction is smaller than the width D3 in the X-axis direction, the luminance improvement in the Y-axis direction is insignificant and the luminance distribution in the X-axis direction is relatively small . Also, since the difference in width between the bottom widths D3 and D4 of the recess 315 is large, the light emitted from the light source, for example, the light emitting element, can improve the light extraction efficiency in the direction with a large recess width, .

The ratio of the length D2 / D1 of the bottom surface 310 or the first light output surface 330 to the length D2 / D1 of the optical lens 300 according to the embodiment is a and the length / length of the recess 315 If the ratio of D3 / D4 is b, then a < b can be satisfied. The b may be provided in a range of 125% or more, such as 125% to 160% of a. This is because the incident surface 310 of the recess 315 in the asymmetric optical lens is provided wider than the symmetrical lens, so that the light can be diffused and provided to a wider range. Accordingly, the optical lens 300 can secure the luminance distribution in the Y-axis direction due to the difference in external length, and can diffuse widely in the X-axis direction and the edge area by the recess 315 in terms of luminance distribution have. Accordingly, the number of bars of the light source module in which the optical lens 300 is arranged can be reduced to two or less, for example, one, and the luminance distribution of the upper and lower corner portions in the backlight unit can be improved.

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

The second exit surface 335 may be disposed perpendicular or inclined to the first horizontal straight line X0 and the second straight line Y0. The second exit surface 335 may extend vertically or obliquely from the outline of the first exit surface 330. The second exit surface 335 includes a third edge 35 adjacent to the first exit surface 330 and the third edge 35 has the same position as the outline of the first exit surface 330 Or may be located inside or outside the outline line of the first exit surface 330.

A straight line connecting the third edge 35 of the second exit surface 335 and the center axis Z0 is defined as 70 占 from the center axis Z0 with respect to the bottom center P0 of the recess 315, Can be located at an angle of less than two degrees. The third edge 35 of the second exit surface 335 is inclined relative to the horizontal first line X0 and the second straight line YO by 20 degrees with respect to the bottom center P0 of the recess 315. [ For example, at an angle of 16 +/- 2 degrees. The angle between the second edge 25 and the third edge 35 of the second exit surface 335 at the bottom center P0 of the recess 315 is not more than 16 degrees, Lt; / RTI &gt; The angle of the second exit surface 335 with respect to a straight line passing through the third edge 35 is an external angle of the optical lens 300. The second exit surface 335 can emit light by refracting light incident in a region spaced from the first straight line X0 and the second straight line YO. The light refracted by the second 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 exit surface 335 can emit the refracted light in a direction lower than the horizontal straight line, and can be reflected by the reflecting sheet of the light unit.

A straight line passing through the center axis Z0 and the second edge 25 of the bottom surface 310 is formed so that the angle? 1 with respect to the first straight line X0 or the second axis YO is 5 degrees or less, And may be in the range of 0.4 to 4 degrees. The angle? 1 may vary depending on the distance from the central axis Z0 and the height of the second edge 25, and when the distance is out of the range, the thickness of the optical lens may be changed and the loss of light may be increased . The second exit surface 335 refracts light that is out of the half-angle from the center axis Z0 with respect to the bottom center P0 of the recess 315, thereby reducing light loss.

The lengths D1 and D2 of the optical lens 300 may be larger 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 of the thickness D5. The first length D1 may be in a range of 15 mm or more, for example, 16 mm to 25 mm, and the second length D2 may be in a range of 17 mm or more, for example, 17 mm to 30 mm. The thickness D5 of the optical lens 300 may be in a range of 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 arranged to be larger than the thickness D5, a uniform luminance distribution can be provided over the entire area of the illumination device and the light unit. Further, 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.

When the ratio of D5 / D1 is c and the ratio of D5 / D2 is d, c and d are not less than 0.3, and c> d. Since the lengths D1 and D2 of the optical lens 300 are larger than the thickness D5 and D2 > D1 and D3 > D4 are satisfied, a uniform luminance distribution is provided over the entire area of the lighting apparatus and the light unit can do. Further, 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 an interval from the bottom center PO to the first apex 21. Here, the first vertex 21 may be the apex of the incident surface 320 or the upper end of the recess 315. The depth D8 of the recess 315 may be in a range of 4 mm or more, for example, 4 mm to 5.2 mm, and may have a range of 0.6 or more, for example, 0.6 to 0.7 of the thickness D5 of the optical lens 300 . The depth D8 of the recess 315 may be at least 60% of the distance between the second vertex 31 of the first exit surface 330 and the bottom center PO or the first edge 23. The recess 315 may have a relationship of e > f when the ratio of D3 / D8 is e and the ratio of D4 / D8 is f. The depth D8 of the recess 315 is deep so that even though the center area of the first exit surface 330 does not have an antireflection or negative curvature, It is possible to diffuse the light in the lateral direction even in the adjacent region. Since the recess 315 has a deep depth D8, the incidence plane 320 can reflect the light incident on the peripheral region of the first vertex 21 in a region close to the second vertex 31, As shown in FIG.

The minimum distance D9 between the recess 315 and the first exit surface 330 is smaller than the distance between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first exit surface 330 ). &Lt; / RTI &gt; The distance D9 may be less than or equal to 3 mm, and may range, for example, from 2 mm to 3 mm. When the distance D9 between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first exit surface 330 is more than 3 mm, The difference in light quantity traveling to the side region may become large, and the 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 exit surface 330 is less than 2 mm, the center side stiffness of the optical lens 300 becomes weak there is a problem. By arranging the distance D9 between the recess 315 and the first exit surface 330 within the above range, even if the center area of the second exit surface 335 does not have a full reflection surface or a negative curvature, The path can be diffused outwardly. This is because the first vertex 21 of the incident surface 320 is closer to the convex second vertex 31 of the first exit surface 330 than to the side of the first exit surface 330 through the entrance surface 320 The light amount of the light traveling in the direction of the arrow can be increased. Therefore, the amount of light diffused in the lateral direction, for example, the Y-axis direction, of the optical lens 300 can be increased.

The first vertex 21 of the incident surface 320 is positioned at a second vertex (center) of the first exit surface 330 rather than a straight line extending horizontally from the third edge 35 of the second exit surface 335 Lt; RTI ID = 0.0 &gt; 31). &Lt; / RTI &gt;

The width D7 of the second exit surface 335 is a straight line distance between the second edge 25 and the third edge 35 and may be less than the depth D8> D7 of the recess 315 . The width D7 of the second exit surface 335 may range, for example, from 1.5 mm to 2.3 mm. When the width D7 of the second exit surface 335 exceeds the above range, the amount of light emitted to the second exit surface 335 is increased to make it difficult to control the light distribution. If the width D7 is smaller than the above range, It may be difficult to secure a gate region.

The second exit surface 335 of the optical lens 300 is disposed on the lower periphery of the first exit surface 330 and the bottom surface 310 is located on the second edge 25 of the second exit surface 335, Can be arranged below the lower limit. The bottom surface 310 may protrude below the horizontal line of the second edge 25 of the second exit surface 335. As another example of the optical lens 300, the second exit surface 335 may have an uneven surface. The uneven surface may be formed as a rough haze surface. The uneven surface may be a surface on which scattering particles are formed. As another example of the optical lens 300, the bottom surface 310 may have an uneven surface. The uneven surface of the bottom surface 310 may be formed into a rough haze surface, or scattering particles may be formed.

The optical lenses according to the embodiments may be arranged on the circuit board 400 at predetermined intervals in the Y axis direction, as shown in Fig. Since the optical lens 300 is arranged in a wide Y-axis direction with a length D2> D1 and a width D4 <D3 of the recess 315, the distance between the optical lenses 300 is widened, And the luminance distribution in the X-axis direction can be improved by the asymmetric structure of the recess 315. [

Such an optical lens may have a directivity angle distribution in the Y-axis direction larger than a directivity angle distribution in the X-axis direction, as shown in Figs. 22 and 23. Fig. For example, the directivity angle distribution in the Y axis direction may be larger than the directivity angle distribution in the X axis direction by 10 degrees or more, for example, 10 degrees to 25 degrees. Further, the half width (FWHM) of the directivity angle distribution in the Y-axis direction may be 10 degrees or more, and the center intensity may be 4% or more.

FIG. 9 is a side sectional view in the Y-axis direction of the optical lens according to the third embodiment, and FIG. 10 is a sectional view in the other X-axis direction of the optical lens in FIG.

9 and 10, the optical lens according to the third embodiment includes a bottom surface 310, a recess formed in a center region of the bottom surface 310 and convex upward from the bottom surface 310 A first emission surface 330 disposed on the opposite side of the bottom surface 310 and the recess 315 and a second emission surface 335 disposed below the first emission surface 330. [ . The optical lens according to the third embodiment has the first and second lengths D1 and D2 and the widths D3 and D4 of the recess 315 and the recesses 315 in the optical lens of the first embodiment, In the depth direction. In addition, the optical lens according to the third embodiment may be provided with a structure in which the widths B1 and B2 of the second exit surface 335 are different depending on regions.

The bottom view shape of the bottom surface 310 of the optical lens may include an elliptical shape. The first length D1 in the X-axis direction may be different from the second length D2 in the Y-axis direction in view of the length of the bottom surface 310 or the first exit surface 330. [ The first length D1 may be a length in the X axis direction of the optical lens 300 and the second length D2 may be a length in the Y axis direction. The first length D1 may be shorter than the second length D2 and the first length D1 may have a difference of 0.5 mm or more, for example, 0.5 mm or more and 3 mm or less, . The length satisfies the condition of D2 > D1, and the ratio of the length ratio (D1: D2) may be in the range of 1: 1.06 to 1: 1.1. The optical lens 300 according to the embodiment is arranged such that the first length D1 is shorter than the second length D2, so that the luminance distribution in the X-axis direction can be prevented from being reduced.

The 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 shape at its side end face. The recess 315 may have a shape in which the width gradually becomes narrower as it goes up. The recess 315 may have a shape gradually converging from the first edge 23 around the bottom toward the first apex 21 at the top. If the bottom view of the recess 315 is elliptical, the diameter may be gradually reduced toward the first vertex 21. The recess 315 may be provided axially symmetrically with respect to the center axis Z0. The first vertex 21 of the incident surface 320 may be provided in a dot shape.

The bottom widths D3 and D4 of the recess 315 may have a width at which a light source, that is, a light emitting device described later, can be inserted. The bottom widths D3 and D4 of the recess 315 may be three times or less the width of the light emitting device, for example, 2.5 times or less. The bottom width D3 and D4 of the recess 315 may be in the range of 1.2 to 2.5 times the width of the light emitting element. If the light emitting element is smaller than the range, It is possible to provide light loss or optical interference through the region between the light emitting element and the first edge 23.

In view of the bottom width of the recess 315, the width D3 in the X-axis direction may be different from the width D4 in the Y-axis direction. For example, the width D3 in the X-axis direction may be larger than the width D4 in the second axis direction. The bottom width of the recess 315 has a relationship of D3 > D4, and the difference may have a difference of 1.5 mm or more and 5 mm or less, for example, 1.5 mm or more and 3 mm or less. The width D3 may be three times or less, for example, two times or less than D4. The ratio D4: D3 of the bottom width of the recess 315 may have a difference in the range of 1: 1.5 to 1: 3. Since the bottom width D3 of the recess 315 in the X-axis direction is larger than the width D4 in the Y-axis direction, it can be provided in an asymmetric lens shape.

Further, even if the difference in width between the bottom widths D3 and D4 of the recess 315 is not large, the light emitted from the light emitting element, for example, induces an improvement in the light extraction efficiency in the direction of a large recess width, can do.

In the optical lens according to the embodiment, the first length D1 in the X-axis direction is shorter than the second length D2 in the Y-axis direction, and the bottom width of the recess 315 is the width in the X- D3 may be arranged wider than the width D4 in the Y-axis direction. Accordingly, the optical lens 300 can secure the luminance distribution in the Y-axis direction due to the difference in external length, and can diffuse widely in the X-axis direction and the edge area by the recess 315 in terms of luminance distribution have.

The ratio of the length D2 / D1 of the bottom surface 310 or the first light exit surface 330 to the length D2 / D1 of the optical lens according to the embodiment is a and the length / length D3 / When the ratio of D4 is b, a < b can be satisfied. The above b may be provided in a range of 120% or more, for example, 120% to 145% of a. This is because the incident surface 320 of the recess 315 in the asymmetric optical lens is provided wider than the symmetrical lens, so that the light can be diffused and provided to a wider range. Accordingly, the optical lens 300 can secure the luminance distribution in the Y-axis direction due to the difference in the external length, and can diffuse widely in the X-axis direction and the radiation direction by the recess 315 in terms of luminance distribution have. Accordingly, the number of bars of the light source module in which the optical lens 300 is arranged can be reduced to two or less, for example, one, and the luminance distribution of the upper and lower corner portions in the backlight unit can be improved.

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

The second exit surface 335 may be disposed perpendicular or inclined to the first horizontal straight line X0 and the second straight line Y0. The second exit surface 335 may extend vertically or obliquely from the outline of the first exit surface 330. The second exit surface 335 includes a third edge 35 adjacent to the first exit surface 330 and the third edge 35 has the same position as the outline of the first exit surface 330 Or may be located inside or outside the outline line of the first exit surface 330.

A straight line connecting the third edge 35 of the second exit surface 335 and the center axis Z0 is 74 占 from the center axis Z0 with respect to the bottom center PO of the recess 315. [ Can be located at an angle of less than two degrees. The third edge 35 of the second exit surface 335 is inclined relative to the horizontal first line X0 and the second axis YO with respect to the bottom center P0 of the recess 315 For example, at an angle of 16 +/- 2 degrees. The angle between the second edge 25 and the third edge 35 of the second exit surface 335 at the bottom center P0 of the recess 315 is not more than 16 degrees, Lt; / RTI &gt; The angle of the second emission surface 335 with respect to a straight line passing through the third edge 35 is an external angle of the optical lens 300. [ The second exit surface 335 can emit light by refracting light incident in a region spaced apart from the horizontal first straight line X0 and the second axis YO. The light refracted by the second exit surface 335 may be emitted at an angle smaller than the angle before refraction with respect to the central axis Z0. Thus, the second exit surface 335 can suppress the refracted light from being radiated in a direction lower than the horizontal axis or the horizontal axis, and can prevent interference with adjacent optical members or loss of light.

The straight line passing through the center axis Z0 and the second edge 25 of the bottom surface 310 is formed so that the angles? 1 and? 2 with respect to the first straight line X0 or the second axis YO are 5 degrees or less For example, in the range of 0.4 to 4 degrees. The angles? 1 and? 2 with respect to the first straight line X0 or the second straight line Y0 may be equal to or less than 1 degree. The angles? 1 and? 2 may vary depending on the distance from the center axis Z0 and the height of the second edge 25, and when the distance is out of the range, the thickness of the optical lens may be changed, Can be increased. The second exit surface 335 refracts light that is out of the half-angle from the center axis Z0 with respect to the bottom center P0 of the recess 315, thereby reducing light loss.

The lengths D1 and D2 of the optical lens 300 may be larger 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 of the thickness D5. The first length D1 of the optical lens 300 may be in a range of 15 mm or more, for example, 16 mm to 26 mm, and the second length D2 may be in a range of 17 mm or more, for example, 17 mm to 30 mm. The thickness D5 of the optical lens 300 may be in a range of 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 arranged to be larger than the thickness D5, a uniform luminance distribution can be provided over the entire area of the illumination device and the light unit. Further, 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 an interval from the bottom center PO to the first apex 21. Here, the first vertex 21 may be the apex of the incident surface 320 or the upper end of the recess 315. The depth D8 of the recess 315 may be 3 mm or more, for example, 4 mm or more, and may have a depth of 60% or more, for example, 63% or more of the thickness D5 of the optical lens 300. If the depth D8 of the recess 315 is not deeper than that of the first embodiment but the center area of the first exit surface 330 has no antireflection or negative curvature, The light can be diffused in the lateral direction even in the adjacent region of the first vertex 21 of the light emitting diode. The recess 315 has a low depth D8 and the light extraction efficiency in the Y axis direction can be improved by the width difference of the recess 315. [

The minimum distance D9 between the recess 315 and the first exit surface 330 is smaller than the distance between the first vertex 21 of the incident surface 320 and the second vertex 31 of the first exit surface 330 ). &Lt; / RTI &gt; The distance D9 may be less than 5 mm and may range, for example, from 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 exit surface 330 is 5 mm or more, Can be lowered. It is possible to effectively perform light diffusion in the Y-axis direction relative to the X-axis direction of the first exit surface 330 by the recess 315 having the above-described structure.

The first vertex 21 of the incident surface 320 is positioned at a second vertex (center) of the first exit surface 330 rather than a straight line extending horizontally from the third edge 35 of the second exit surface 335 Lt; RTI ID = 0.0 &gt; 31). &Lt; / RTI &gt;

The widths B1 and B2 of the second exit surface 335 are the straight line distances between the second edge 25 and the third edge 35. The width B2 of the region near the second edge 25 in the first horizontal straight line X0 direction is the largest and the width B2 of the second straight line Y0 The width B1 of the region close to the second edge 25 in the direction of the arrow A may be the narrowest. The width B2 becomes gradually wider as the second edge 25 in the horizontal first straight line X0 direction becomes wider and the width B1 becomes closer as the second edge 25 in the second straight line Y0 direction becomes closer. Can be gradually narrowed. The width B2 of the second exit surface 335 may be larger than B1, and B2 may be larger than B1 by 0.1 mm or more.

The maximum width B2 of the widths B1 and B2 of the second exit surface 335 may be smaller than the depth D8 of the recess 315. [ The widths B1 and B2 of the second exit surface 335 may range, for example, from 1.5 mm to 2.3 mm. When the width B2 of the second exit surface 335 is larger than the above range, the amount of light emitted to the second exit surface 335 increases, and light distribution control becomes difficult. Here, the second emitting surface 335 can be used as a gate region when a region having a width B2 is used to manufacture the lens body.

The second exit surface 335 of the optical lens 300 is disposed on the lower periphery of the first exit surface 330 and the bottom surface 310 is located on the second edge 25 of the second exit surface 335, May be disposed below. The bottom surface 310 may protrude below the horizontal line of the second edge 25 of the second exit surface 335. As another example of the optical lens 300, the second exit surface 335 may have an uneven surface. The uneven surface may be formed as a rough haze surface. The uneven surface may be a surface on which scattering particles are formed. As another example of the optical lens 300, the bottom surface 310 may have an uneven surface. The uneven surface of the bottom surface 310 may be formed into a rough haze surface, or scattering particles may be formed.

The optical lenses according to the embodiments may be arranged on the circuit board 400 at predetermined intervals in the Y axis direction, as shown in Fig. Since the width of the recesses 315 (D4 < D3) is arranged in a wide Y-axis direction, it is possible to reduce the number of the optical lenses 300 while widening the interval between the optical lenses 300, The asymmetric structure of the seth 315 can improve the luminance distribution in the X-axis direction.

Figs. 11 and 12 are optical lenses according to the fourth embodiment, which are sectional views of the first and second axial directions as a modification of the second embodiment. Fig. In describing the fourth embodiment, the same portions as the above-described embodiments will be described with reference to the description of the above embodiments.

11 and 12, the optical lens includes an optical lens 300 having a bottom surface 310, a recess (not shown) recessed upward from the bottom surface 310 in the center area of the bottom surface 310 315), an incidence surface (320) around the recess (315), a first exit surface (330) disposed on the opposite side of the bottom surface (310) and the recess (315) And a second exit surface 335 disposed at a lower portion of the first exit surface 330.

The optical lens may have a concave portion 330A that is concave in the center region of the first exit surface 330, and the concave portion 330A may have a gradually deeper depth toward the center. The concave portion 330A may be provided as a full reflection surface that reflects incident light in a lateral direction. The recess 330A may be the lowest point corresponding to the apex 21 of the recess 315 and may include a concave curved surface or a curved surface having a different curvature.

FIG. 13 is a view showing a light source module having an optical lens according to the embodiment, FIG. 14 is a G-G side sectional view of the light source module of FIG. 13, and FIG. 15 is a sectional view on the H-H side of the light source module of FIG.

13 to 15, a light source module 400A includes a plurality of optical lenses 300 disposed on a circuit board 400, and at least one light emitting device 100 is disposed in the optical lens 300 .

One or a plurality of the light emitting devices 100 may be arranged on the circuit board 400 at predetermined intervals. The light emitting device 100 is disposed between the optical lens 300 and the circuit board 400 and receives power from the circuit board 400 to emit 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 resin-made PCB, a metal core PCB (MCPCB) having a metal core, and a flexible PCB (FPCB), but the present invention 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 exit surfaces 330 and 335. Part of the light incident from the incident surface 320 may be reflected by the bottom surface 310 through a predetermined path and emitted to the first or second exit surface 330 or 335.

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

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

Since the light emitting device 100 provides more than five light emitting surfaces, the directivity distribution of the light emitting device 100 can be broadened by the light emitted through the side surfaces. Since the directivity angle distribution of the light emitting device 100 is widely provided, light diffusion using the optical lens 300 is easier. The directivity angle distribution emitted from the optical lens 300 is greater than the angle formed by the two straight lines passing through the third edge 35 of the second exit surface 335 of the optical lens 300 from the central axis P0 have. The directivity angle distribution emitted from the optical lens 300 includes a directivity distribution of the light emitted through the second exit surface 335 so that the optical loss due to the light distribution emitted from the second exit surface 335 And the luminance distribution can be improved.

Here, the light emitting device 100 may have the same length or different lengths in the directions of the first and second axes (X, Y), and may have different lengths. For example, as shown in FIGS. 14 and 15, (Not shown). As another example, the light emitting device 100 may be disposed below the recess 315, but is not limited thereto. Since the light emitting device 100 emits light through a plurality of side surfaces in the recess 315, light can be incident on the entire area of the incident surface 320, thereby improving light incidence efficiency.

The bottom surface 310 of the optical lens 300 may provide an inclined surface with respect to the upper 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 X axis. The bottom surface 310 may have an area of 80% or more, for example, an entire area inclined with respect to the upper surface of the circuit board 400. The bottom surface 310 may include a full reflecting 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 have. The first edge 23 can be disposed at a lower position than the active layer in the light emitting device 100, thereby preventing loss of light.

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

The second exit surface 335 refracts the angle of the light after refraction with respect to the center axis Z0 to be smaller than the angle of the light that is incident before the refraction. A part of the light emitted through the second exit surface 335 and the light emitted to the first exit surface 330 are reflected by the optical lens 300, They can be mixed with each other in the vicinity of the periphery.

The second exit surface 335 is disposed around the lower surface of the first exit surface 330 to refract the incident light. The second exit surface 335 includes a sloped surface or a flat surface. The second emission surface 335 may be, for example, a surface perpendicular to the upper surface of the circuit board 400 or a tilted surface. When the second exit surface 335 is formed as an inclined surface, the second exit surface 335 can be easily separated during injection molding. The second exit surface 335 receives a part of light emitted to the side surface of the light emitting device 100, refracts and extracts the light. At this time, the outgoing angle of the emitted light may be smaller than the incident angle before refraction, with respect to the central axis Z0, on the second exit surface 335. [ Accordingly, the optical interference distance between adjacent optical lenses 300 can be prolonged.

The optical lens 300 according to the embodiment has a structure in which the bottom width of the recess 315 is larger in the Y axis direction than in the X axis direction and can be arranged on the circuit board 400 in the Y axis direction. The light of the light emitting device 100 emitted into the recess 315 can be diffused in the Y axis direction in the recess 315 and then spread in the X axis direction and the edge area. The embodiment can further diffuse light in a specific axial direction by the asymmetric recess 315, thereby reducing the number of bars of the light source module.

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 the optical lens 300 can be prevented from being tilted. The side surface protrusion 360 of the optical lens 300 may protrude along the Y axis direction of the second exit surface 335.

16 is a view showing a light unit having an optical lens according to the embodiment.

16, the light unit includes a bottom cover 510, a plurality of circuit boards 400 as a light source module 400A, a light emitting device 100, and the plurality of circuit boards 400 in the bottom cover 510. [ And an optical lens 300 disposed on the optical lens 300. 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 source module 400A or may reflect toward the display panel.

The circuit board 400 of the light source module 301 may be arranged in two or less, for example, one, 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 a thermally conductive resin material for heat dissipation. The bottom cover 510 may include a receiving portion, and a side cover may be provided around the receiving portion. 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 or the like, but is not limited thereto.

An optical sheet (not shown) may be disposed on another bottom cover 510 in the embodiment, and the optical sheet may include at least one of prism sheets for collecting scattered light, a brightness enhancing sheet, . &Lt; / RTI &gt; A light guiding layer (not shown) made of a transparent material may be disposed between the optical sheet and the light source module, but the present invention is not limited thereto.

The bottom cover 510 according to the embodiment has the bottom 511 in which the X axis direction is longer than the Y axis direction and the optical lens 300 according to the embodiment has the length D2 > (D3 > D4) of the bottom portion 511, light can be effectively irradiated to the corner region 511A of the bottom 511 and the corner direction. This can reduce the occurrence of dark portions in the corner area 511A of the bottom 511 by the 1-bar light source module.

A reflecting plate may be disposed on the bottom 511 of the bottom cover 510, but the present invention is not limited thereto. A reflective layer may be further disposed on the side surface of the bottom 511, but the present invention is not limited thereto.

The light emitting device 100 according to the embodiment may have a fluorescent film disposed on its surface. The fluorescent film includes at least one or more of a blue phosphor, a cyan fluorescent material, a green fluorescent material, a yellow fluorescent material, and a red fluorescent material, and may be a single layer or a multilayer. In the fluorescent film, a phosphor is added in the light transmitting resin material. The light transmitting resin material may include a material such as silicon or epoxy, and the phosphor may be selectively formed from YAG, TAG, Silicate, Nitride, and Oxy-nitride materials. The fluorescent film may include a fluorescent material such as a quantum dot. The quantum dot may include an 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 dot is a nanometer sized particle that can have optical properties resulting from quantum confinement. The specific composition (s), structure and / or size of the quantum dots can be selected so that light of a desired wavelength is emitted from the quantum dots upon excitation with a specific excitation source. By changing the size, the quantum dots can be adjusted to emit light throughout the visible spectrum. 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- VI compound, an I-III-VI compound, a II-IV-VI compound, a II-IV-V compound, an alloy comprising any of the above, and / or a tertiary and quaternary mixture or alloy , And mixtures of any of the foregoing. The quantum dot is, 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 the light emitting device according to the embodiment will be described with reference to FIGS. 17 to 19. FIG. 17 is a view showing a first example of the light emitting device according to the embodiment. An example of a light emitting device and a circuit board will be described with reference to Fig.

Referring to FIG. 17, 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 more of blue, green, yellow, and red phosphors, and may be a single layer or a multi-layer structure. A phosphor is added to the phosphor layer 150 in the light transmitting resin material. The light transmitting resin material may include a material such as silicon or epoxy, and the phosphor may be selectively formed from YAG, TAG, Silicate, Nitride, and Oxy-nitride materials.

The phosphor layer 150 may be disposed on the upper surface of the light emitting chip 100A or on the upper surface and side surfaces of the light emitting chip 100A. The phosphor layer 150 may be disposed on a surface of the light emitting chip 100A where the light is emitted to change the wavelength of the light.

The phosphor layer 150 may include a single layer or a different phosphor layer, and the different layers may have at least one phosphor selected from the group consisting of red, yellow and green phosphors, And may have a phosphor different from the first layer of the red, yellow, and green phosphors formed on the first layer. As another example, the different phosphor layers may include three or more phosphor layers, but the present invention is not limited thereto.

As another example, the phosphor layer 150 may include a film type. Since the film type phosphor layer has a uniform thickness, the color distribution due to the wavelength conversion can be uniform.

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, And may include an electrode 135, a second electrode 137, a first connection electrode 141, a second connection electrode 143, and a support layer 140.

The substrate 111 may use a light-transmitting, insulating or conductive substrate, e.g., sapphire (Al ₂ O _3), SiC, Si, GaAs, GaN, ZnO, Si, GaP, InP, Ge, Ga ₂ O ₃ of At least one can be used. At least one or both of the top surface and the bottom surface of the substrate 111 may have a plurality of convex portions (not shown) to improve light extraction efficiency. The side cross-sectional shape of each convex portion may include at least one of hemispherical shape, semi-elliptical shape, or polygonal shape. In this case, the first semiconductor layer 113 or the first conductivity type semiconductor layer 115 may be formed as a top layer of the light emitting chip 100A, .

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 group II to V elements. The first semiconductor layer 113 may be formed of at least one layer or a plurality of layers using compound semiconductors of Group II through Group V elements. The first semiconductor layer 113 may be formed of a semiconductor layer using a compound semiconductor of Group III-V elements, for example, GaN, InN, AlN, InGaN, AlGaN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, AlGaInP, GaP. &Lt; / RTI &gt; 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 an undoped semiconductor layer. The buffer layer can reduce the difference in lattice constant between the substrate and the nitride semiconductor layer, and the undoped semiconductor layer can improve the 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 a compound semiconductor of group II to V elements and a group III-V element, and can emit a predetermined peak wavelength within a wavelength range from the ultraviolet band to the visible light band.

The light emitting structure 120 includes a first conductive semiconductor layer 115, a second conductive semiconductor layer 119, and a second conductive semiconductor layer 115 between the first conductive semiconductor layer 115 and the second conductive semiconductor layer 119 The active layer 117 may be formed on at least one of the upper and lower layers 115, 117, and 119, but the present invention is not limited thereto.

The first conductive semiconductor layer 115 may be disposed under the first semiconductor layer 113 and may be formed of a semiconductor, for example, an n-type semiconductor layer doped with a first conductive dopant. The first conductive semiconductor layer 115 includes a composition formula of In _x Al _y Ga _{1 -x- y} N (0? X? 1, 0? _Y? 1, 0? _X + y? The first conductive semiconductor layer 115 may be a compound semiconductor of Group III-V elements such as GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, . The first conductive dopant is an n-type dopant and includes dopants such as Si, Ge, Sn, Se, and Te.

The active layer 117 is disposed under the first conductive 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 well layer and the period of the barrier layer. InGaN / AlGaN, InGaN / InGaN, InGaN / InGaN, AlGaAs / GaA, InGaAs / GaAs, InGaP / GaP, AlInGaP / InGaP, InGaN / AlGaN, AlGaN / AlGaN, / RTI &gt; pair of &lt; / RTI &gt;

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

As another example of the light emitting structure 120, the first conductive semiconductor layer 115 may be a p-type semiconductor layer, and the second conductive semiconductor layer 119 may be an n-type semiconductor layer. A third conductive type semiconductor layer having a polarity opposite to the second conductive type may be formed on the second conductive type semiconductor layer 119. Also, the light emitting structure 120 may have any one of an 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 type semiconductor layer 119. The electrode layer 131 may include a reflective layer. The electrode layer 131 may include an ohmic contact layer contacting the second conductive semiconductor layer 119 of the light emitting structure 120. The reflective layer may be selected from a material having a reflectance of 70% or more, for example, a metal of Al, Ag, Ru, Pd, Rh, Pt or Ir, and an alloy of two or more of the above metals. The metal of the reflective layer may contact the second conductive type semiconductor layer 119. The ohmic contact layer may be selected from a light-transmitting material, a metal or a non-metal material.

The electrode layer 131 may include a laminate structure of a light-transmitting electrode layer / a reflective layer. The light-transmitting electrode layer may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO) zinc oxide (IGTO), 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 combinations thereof. A reflective layer of a metal material may be disposed under the transparent electrode layer and may be formed of a material selected from Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, Hf, . As another example of the reflective layer, a DBR (distributed bragg reflection) structure in which two layers having different refractive indices are alternately arranged may be formed.

A light extracting structure such as a roughness may be formed on the surface of at least one of the second conductive type semiconductor layer 119 and the electrode layer 131. Such a light extracting structure may change the critical angle of incident light, The light extraction efficiency can be improved.

The insulating layer 133 is disposed under the electrode layer 131. The lower surface of the second conductive type semiconductor layer 119 and the side surfaces of the second conductive type semiconductor layer 119 and the active layer 117, And may be disposed in a partial region of the first conductivity type semiconductor layer 115. The insulating layer 133 may be formed in a region of the light emitting structure 120 excluding the electrode layer 131, the first electrode 135 and the second electrode 137, So that the lower part is electrically protected.

The insulating layer 133 includes an insulating material or an insulating resin formed of at least one of oxides, nitrides, fluorides, and sulfides having at least one of Al, Cr, Si, Ti, Zn, and Zr. The insulating layer 133 may be selectively formed, for example, of 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 a multilayer, but is not limited thereto. The insulating layer 133 is formed to prevent an interlayer short circuit of the light emitting structure 120 when the metal structure for flip bonding is formed under the light emitting structure 120.

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

A first electrode 135 may be disposed under a portion of the first conductive semiconductor layer 115 and a second electrode 137 may be disposed under a portion of the electrode layer 131. A first connection electrode 141 is disposed under the first electrode 135 and a second connection electrode 143 is disposed under 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 is electrically connected to the first electrode 135 through the electrode layer 131. [ 2 conductive type semiconductor layer 119 and the second connection electrode 143, as shown in FIG.

The first electrode 135 and the second electrode 137 may be formed of at least one of Cr, Ti, Co, Ni, V, Hf, Ag, Al, Ru, Rh, Pt, Pd, And may be formed as a single layer or multiple layers. The first electrode 135 and the second electrode 137 may have the same or different lamination structures. At least one of the first electrode 135 and the second electrode 137 may have a current diffusion pattern such as an arm or a finger structure. The first electrode 135 and the second electrode 137 may be formed of one or a plurality of electrodes, but the present invention is not limited thereto. At least one of the first and second connection electrodes 141 and 143 may be arranged in plural, but the present invention is not limited thereto.

The first connection electrode 141 and the second connection electrode 143 provide a lead function and a heat dissipation path for supplying power. 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 column, and a shape such as a polygonal column. The first connection electrode 141 and the second connection electrode 143 may be formed of a metal powder material such as Ag, Al, Au, Cr, Co, Cu, Fe, Hf, In, Mo, Ni, , Ti, W, and a selective alloy of these metals. The first connection electrode 141 and the second connection electrode 143 may be formed of one or more of In, Sn, Ni, Cu, and their alloys Or the like.

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 . The lower surfaces of the first and second connection electrodes 141 and 143 may be exposed on the lower surface of the support layer 140.

The supporting layer 140 is used as a layer for supporting the light emitting device 100. The supporting layer 140 is formed of an insulating material, and the insulating material is formed of a resin layer such as silicon or epoxy. As another example, the insulating material may include a paste or an insulating ink. The insulating material may be selected from the group consisting of polyacrylate resin, epoxy resin, phenolic resin, polyamides resin, polyimides rein, unsaturated polyesters resin, polyphenylene ether resin (PPE), polyphenylene oxide resin (PPO), polyphenylenesulfide resin, cyanate ester resin, benzocyclobutene (BCB), Polyamido-amine Dendrimers (PAMAM), and Polypropylene-imine, Dendrimers (PPI), and PAMAM-internal structures and PAMAM-OS (organosilicon) with organic-silicone outer surfaces alone or combinations thereof . The supporting layer 140 may be formed of a material different from that of the insulating layer 133.

At least one of compounds such as oxides, nitrides, fluorides, and sulfides having at least one of Al, Cr, Si, Ti, Zn, and Zr may be added to the support layer 140. Here, the compound added in the support layer 140 may be a heat spreader, and the heat spreader may be used as a powder particle, a grain, a filler, or an additive of a predetermined size. The heat spreader may include a ceramic material. The ceramic material may include a low temperature co-fired ceramic (LTCC), a high temperature co-fired ceramic (HTCC), an alumina, Quartz, calcium zirconate, forsterite, SiC, graphite, fused silica, mullite, cordierite, zirconia, beryllia, ), And aluminum nitride. The ceramic material may be formed of a metal nitride having thermal conductivity higher than that of nitride or oxide among the insulating materials such as nitride or oxide, and the metal nitride may include a material having a thermal conductivity of, for example, 140 W / mK or more. The ceramic material may be, for example, 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- CeO 2, AlN, and the like. The thermally conductive material may comprise 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 circuit layer (not shown) having a metal layer 471, an insulating layer 472 on the metal layer 471, a plurality of lead electrodes 473 and 474 on the insulating layer 472, And a protective layer 475 for protecting the protective layer. The metal layer 471 is a heat dissipation layer, and includes a metal such as Cu or Cu-alloy having high thermal conductivity, and may be formed as a single layer or a multi-layer structure.

The insulating layer 472 insulates the metal layer 471 from 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) . In addition, additives such as metal oxides such as TiO ₂ , SiO ₂ , and Al ₂ O ₃ may be added to the insulating layer 472, but the present invention is not limited thereto. As another example, the insulating layer 472 may be formed by adding a material such as graphene to an insulating material such as silicon or epoxy, and is not limited thereto.

The insulating layer 472 may be an anodized region in which the metal layer 471 is formed by an anodizing process. Here, the metal layer 471 may be made of aluminum, and the anodized region may be formed 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 adhesive 461, 462 may include a metal material such as a solder material. The first lead electrode 473 and the second lead electrode 474 serve as a circuit pattern to 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 a resist material such as a white resist material, but is not limited thereto. The protective layer 475 may function as a reflective layer, and may be formed of a material having a reflectance higher than that of the absorptance, for example. As another example, the protective layer 475 may be disposed of a material that absorbs light, and the light absorbing material may include a black resist material.

A second example of the light emitting device will be described with reference to FIG.

Referring to FIG. 18, 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 more of blue, green, yellow, and red phosphors, and may be a single layer or a multi-layer structure. A phosphor is added to the phosphor layer 150 in the light transmitting resin material. The light transmitting resin material may include a material such as silicon or epoxy, and the phosphor may be selectively formed from YAG, TAG, Silicate, Nitride, and Oxy-nitride materials.

The phosphor layer 150 may be disposed on the upper surface of the light emitting chip 100B or on the upper surface and the side surface of the light emitting chip 100B. The phosphor layer 150 may be disposed on a region where light is emitted from the surface of the light emitting chip 100B to change the 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, a second electrode 137, A first connection electrode 141, a second connection electrode 143, and a support layer 140. The first connection electrode 141, the second connection electrode 143, The substrate 111 and the second semiconductor layer 113 can be removed.

The light emitting chip 100B of the light emitting device 100 and the circuit board 400 may be connected to each other by connection electrodes 161 and 162 and the connection electrodes 161 and 162 may include a conductive pump or a solder bump. The conductive pump may be arranged under one or more electrodes 135 and 137, but the present invention 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.

A third example of the light emitting device will be described with reference to FIG.

Referring to FIG. 19, the light emitting device 100 includes a light emitting chip 200A connected to a circuit board 400. FIG. 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 of FIG. 4) is disposed on the light emitting device 100 to control the directivity of 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-VII element. The plurality of pads 245 and 247 are selectively connected to the semiconductor layer of the light emitting structure 225 to 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 substrate, an insulating substrate, or a conductive substrate. This structure will be described with reference to the description of the light emitting structure and the substrate in Fig.

The light emitting chip 200A has pads 245 and 247 disposed thereunder and the pads 245 and 247 include first and second pads 245 and 247. The first and second pads 245 and 247 are spaced apart from each other below 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 a polygonal or circular bottom shape 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 bottom surface area of each of the first and second pads 245 and 247 may be, for example, a size corresponding to the top surface size of each of the first and second lead electrodes 415 and 417.

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 relaxing the difference in lattice constant between the substrate 221 and the semiconductor layer, and may be selectively formed from Group II to VI compound semiconductors. An undoped Group III-V compound semiconductor layer may be further formed under the buffer layer, but the present invention is not limited thereto. The substrate 221 can be removed. When the substrate 221 is removed, the phosphor layer 250 may contact the upper surface of the first conductive type semiconductor layer 222 or the upper surface of 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 a multilayer, 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 a 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, a metal oxide or a metal nitride. The first electrode layer may include at least one of indium tin oxide (ITO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc oxide (IZO) 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 the first electrode layer 241 is partially removed.

As another example, the structures of the first and second electrode layers 241 and 242 may be stacked in an omni directional reflector layer (ODR) structure. The omnidirectional reflection structure may have a stacked 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 in contact with the first electrode layer 241. The electrode layers 241 and 242 may have a laminated structure of, for example, ITO / Ag. The total reflection angle at the interface between the first electrode layer 241 and the second electrode layer 242 can be improved.

As another example, the second electrode layer 242 may be removed and formed of a reflective layer of another material. The reflective layer is a distributed Bragg reflection: can be formed of (distributed bragg reflector DBR) structure, and the distributed Bragg reflection structure to each other comprises a structure du dielectric layers are arranged alternately having different refractive indices, e.g., SiO ₂ layer , A Si ₃ N ₄ layer, a TiO ₂ layer, an Al ₂ O ₃ layer, and a MgO layer, respectively. As another example, the electrode layers 241 and 242 may include both a distributed Bragg reflection structure and an omni-directional reflection structure, and in this case, the light emitting chip 200A having a light reflectance of 98% or more can be provided. Since the light emitted from the second electrode layer 242 is emitted through the substrate 221, the light emitting chip 200A mounted in the flip-type can emit most of the light in the vertical direction. The light emitted to the side of the light emitting chip 200A may be reflected by the reflective sheet 600 to the incident surface area of the optical lens.

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 may be formed of a metal such as titanium, copper, nickel, gold, chromium, tantalum, platinum, tin, ), Silver (Ag), and phosphorus (P). A first pad 245 and a second pad 247 are disposed under the third electrode layer 243. The insulating layers 231 and 233 prevent 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 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 second half 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 semiconductor layer 222. The connection part 244 of the third electrode layer 243 protrudes in a via structure through the first and second electrode layers 241 and 242 and the lower part of the light emitting structure 225 and contacts the first conductivity type semiconductor layer 222 do. The connection portions 244 may be arranged in a plurality. A portion 232 of the first insulating layer 231 extends around the connecting 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, Type semiconductor layer 224 and the active layer 223. An insulating layer may be disposed on the side surface of the light emitting structure 225 to protect the side surface of the light emitting structure 225. The present invention is not limited thereto.

The second pad 247 is disposed below the second insulating layer 233 and contacts the at least one of the first and second electrode layers 241 and 242 through an open region of the second insulating layer 233 Or connected. The first pad 245 is disposed below the second insulating layer 233 and is connected to the third electrode layer 243 through an open region of the second insulating layer 233. [ 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 conductive type semiconductor layer 222 through the third electrode layer 243.

The first and second pads 245 and 247 are spaced apart from each other at a lower portion of the light emitting chip 200A and face the first and second lead electrodes 415 and 417 of the circuit board 400, respectively. The first and second pads 245 and 247 may include polygonal recesses 271 and 273 and the recesses 271 and 273 are formed to be convex in the direction of the light emitting structure 225. The recesses 271 and 273 may be formed to have a depth equal to or smaller than the thickness of the first and second pads 245 and 247. The depths of the recesses 271 and 273 may be different from the depths of the first and second pads 245 and 247, Can be increased.

Bonding members 255 and 257 are disposed in a region between the first pad 245 and the first lead electrode 415 and 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 a portion thereof may be 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 can be increased because the bonding members 255 and 257 are disposed in the recesses 271 and 273, have. Accordingly, the first and second pads 245 and 247 are bonded to the first and second lead electrodes 415 and 417, thereby improving the electrical reliability and heat dissipation efficiency of the light emitting chip 200A.

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

As another example, the bonding members 255 and 257 may include a conductive film, and the conductive film includes at least one conductive particle in the insulating film. The conductive particles may include at least one of, for example, a metal, a metal alloy, and carbon. The conductive particles 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.

Between the light emitting chip 200A and the circuit board 400, an adhesive member, for example, a thermally conductive film may be included. The thermally conductive film may be a polyester resin such as polyethylene terephthalate, polybutylene terephthalide, polyethylene naphthalate and polybutylene naphthalate; Polyimide resin; Acrylic resin; Styrenic resins such as polystyrene and acrylonitrile-styrene; Polycarbonate resin; Polylactic acid resin; Polyurethane resin; Etc. may be used. Further, polyolefin resins such as polyethylene, polypropylene and ethylene-propylene copolymer; Vinyl resins such as polyvinyl chloride and polyvinylidene chloride; Polyamide resins; Sulfonic resin; Polyether-ether ketone resin; Allylate series resin; Or a blend of the resins.

The light emitting chip 200A emits light through the surface of the circuit board 400 and the side surfaces and the upper surface of the light emitting structure 225, thereby improving light extraction efficiency. Since the light emitting chip 200A can be directly bonded onto the circuit board 400, the process can be simplified. Further, since the heat dissipation of the light emitting chip 200A is improved, the light emitting chip 200A can be advantageously utilized in an illumination field or the like.

Figs. 24 and 25 show the luminance distribution in the X-axis direction and the Y-axis direction according to the depth of the recess in the optical lens according to the first embodiment, and Fig. 26 shows the color difference distribution in the Y-axis direction.

In Figs. 24 to 26, in the optical lens example 1, example 2, and example 3, the bottom width of the recess is in the range of D3 > D4 in the range of 7 mm to 7.5 mm, and the depth of the recess is gradually lowered . By reducing the depth of the recesses, it can be seen that the half width becomes narrower, and it can be seen that the half width is widely distributed in the lateral direction as shown in FIG.

The optical lens and the display device having the light source module having the optical lens according to the embodiments can be applied to various portable terminals, monitors of notebook computers, monitors of laptop computers, televisions, and the like. The light source module according to the embodiment can be applied to a light unit. The light unit includes a structure having one or a plurality of light source modules, and may include a three-dimensional display, various illumination lights, a traffic light, a vehicle headlight, an electric sign board, and the like.

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

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100: Light emitting element
100A, 110B, 200A: Light emitting chip
150, 250: phosphor layer
300: Optical lens
310: bottom surface
315: recess
320: incidence plane
330: first emission surface
335: second emission surface
350: support projection
360: side projection
400: circuit board
400A: Light source module

Claims (19)

Bottom surface;
A concave recess in the center region of the bottom surface;
A first emitting surface having a convex curved surface opposite to the bottom surface and the recess;
A second emitting surface between the bottom surface and the first emitting surface; And
And a side projecting portion disposed along the first axis direction in the second exit surface,
Wherein the bottom surface has a length D1 in a first axis direction and a length D2 in a second axis direction perpendicular to the first axis direction,
The bottom of the recess has a length D3 in the first axial direction and a length D4 in the second axial direction,
The length of the bottom surface has a relationship of D1 < D2,
The bottom length of the recess has a relationship of D3 > D4,
Wherein the ratio of the length of the bottom surface to the length of the recess has a relationship of D2 / D1 < D3 / D4. The method according to claim 1,
And the second exit surface has a vertical plane or an inclined surface. 3. The method of claim 2,
And the thickness of the second exit surface is equal to or thicker than the thickness of the side surface projection. The method according to claim 1,
A plurality of support protrusions on the bottom surface,
Wherein a length in the first axial direction or a length in the second axial direction of the plurality of support protrusions is longer than a length in the first axial direction or a length in the second axial direction of the recess. 5. The method according to any one of claims 1 to 4,
Wherein the bottom surface has a different height from a first edge adjacent to the recess and a second edge from the outermost edge. 6. The method of claim 5,
Wherein said bottom surface comprises at least one of a curved surface and an inclined surface between said first edge and said second edge. 6. The method of claim 5,
And the height of the recess is larger than the length of the recess in the first axial direction. 6. The method of claim 5,
And the height of the recess is smaller than the length in the first axial direction of the recess and larger than the length in the second axial direction. 6. The method of claim 5,
And the second exit surface has a thickness in the first axis direction and a thickness in the second axis direction different from each other. 10. The method of claim 9,
And the second exit surface is thinner in thickness in the first axis direction than in the second axis direction. 11. The method of claim 10,
Wherein the thickness of the first exit surface gradually increases from the first axis direction toward the second axis direction. 6. The method of claim 5,
Wherein the bottom view shape of the recess has an elliptical shape. 6. The method of claim 5,
The recess having a first vertex converging with respect to the first and second axial directions,
Wherein the first vertex of the recess is adjacent to the second vertex of the first exit surface than the bottom of the recess. 6. The method of claim 5,
And the second exit surface has a curved surface or a flat surface with a convex center area. A circuit board;
At least one light emitting element on the circuit board; And
And at least one optical lens on the light emitting element,
Wherein the optical lens comprises:
A bottom surface on the circuit board;
A concave recess in the center region of the bottom surface;
A first emitting surface having a convex curved surface on a side opposite to the bottom surface and the recess;
A second emitting surface between the bottom surface and the first emitting surface; And
And a side projecting portion disposed along the first axis direction in the second exit surface,
Wherein the bottom surface has a length D1 in a first axis direction and a length D2 in a second axis direction perpendicular to the first axis direction,
The bottom of the recess has a length D3 in the first axial direction and a length D4 in the second axial direction,
The length of the bottom surface has a relationship of D1 < D2,
The bottom length of the recess has a relationship of D3 > D4,
Wherein the ratio of the length of the bottom surface to the length of the recess has a relationship of D2 / D1 < D3 / D4. 16. The method of claim 15,
The length of the circuit board in the first axis direction is longer than the length in the second axis direction in the top view,
Wherein the length of the optical lens in the second axial direction is longer than the length of the circuit board in the second axial direction. 16. The method of claim 15,
A plurality of support protrusions coupled to the circuit board and disposed on a bottom surface of the optical lens,
Wherein a length in the first axial direction or a length in the second axial direction of the plurality of support protrusions is longer than a length in the first axial direction or a length in the second axial direction of the recess. 17. The method of claim 16,
Wherein the light emitting device includes an LED chip that emits light through an upper surface and a plurality of side surfaces. A bottom cover having a storage area;
A circuit board disposed on the bottom cover in a first axial direction;
A plurality of light emitting elements arranged in a first axis direction of the circuit board; And
And a plurality of optical lenses arranged on each of the light emitting elements,
Wherein the plurality of optical lenses are arranged in one row in the first axial direction in the bottom cover,
Each of the above-
A bottom surface on the circuit board;
A concave recess in the center region of the bottom surface;
A first emitting surface having a convex curved surface on a side opposite to the bottom surface and the recess;
A second emitting surface between the bottom surface and the first emitting surface; And
And a side projecting portion disposed along the first axis direction in the second exit surface,
Wherein the bottom surface has a length D1 in a first axis direction and a length D2 in a second axis direction perpendicular to the first axis direction,
The bottom of the recess has a length D3 in the first axial direction and a length D4 in the second axial direction,
The length of the bottom surface has a relationship of D1 < D2,
The bottom length of the recess has a relationship of D3 > D4,
Wherein the ratio of the length of the bottom surface to the length of the recess has a relationship of D2 / D1 < D3 / D4.

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