Light diffusion lens and light emitting device
阅读说明:本技术 光漫射透镜和发光装置 (Light diffusion lens and light emitting device ) 是由 韩玎儿 金恩柱 南基范 于 2014-12-31 设计创作,主要内容包括:公开了一种光漫射透镜和发光装置。所述光漫射透镜包括:出光部分,是位于上表面与平坦的下表面之间的外侧表面,且向外部发出光;入光部分,具有从所述下表面沿内部方向凹陷的形状且是光入射的区域;以及反射部分,对应于所述上表面,具有从上部沿内部方向凹陷的形状,且将光反射至所述出光部分,其中,所述出光部分包括平面和凸面,其中,所述出光部分的所述凸面从所述平面延伸并与所述下表面的末端连接,其中,所述入光部分具有沿光轴方向凸出的至少一个第一凸面。(Disclosed are a light diffusion lens and a light emitting device. The light diffusion lens includes: a light emitting portion which is an outer side surface between the upper surface and the flat lower surface and emits light to the outside; a light incident portion having a shape recessed from the lower surface in an inner direction and being a region where light is incident; and a reflection portion corresponding to the upper surface, having a shape recessed from an upper portion in an inner direction, and reflecting light to the light exit portion, wherein the light exit portion includes a plane and a convex surface, wherein the convex surface of the light exit portion extends from the plane and is connected with a distal end of the lower surface, wherein the light entrance portion has at least one first convex surface protruding in an optical axis direction.)
1. A light diffusing lens comprising:
a light emitting portion which is an outer side surface between the upper surface and the flat lower surface and emits light to the outside;
a light incident portion having a shape recessed from the lower surface in an inner direction and being a region where light is incident; and
a reflection portion corresponding to the upper surface, having a shape recessed from an upper portion in an inner direction, and reflecting light to the light exit portion,
wherein the light-emitting portion includes a plane and a convex surface,
wherein the convex surface of the light exit portion extends from the plane and is connected to an end of the lower surface,
wherein the light incident portion has at least one first convex surface protruding in the optical axis direction.
2. The light diffusing lens of claim 1, wherein the plane of the light exiting portion forms an angle with the lower surface that is less than 90 degrees.
3. The light diffusion lens of claim 1, wherein the plane of the light exit portion forms an angle of 90 degrees or more with the lower surface.
4. The light diffusing lens of claim 1, wherein the first convex surface of the light entry portion extends from an inner vertex of the light entry portion.
5. The light diffusing lens of claim 1, wherein the light entry portion further comprises a planar surface extending from the first convex surface.
6. The light diffusing lens of claim 5, wherein the plane of the light entry portion extends in an upper direction of the first convex surface.
7. The light diffusing lens of claim 5, wherein the plane of the light entry portion extends in a lower direction of the first convex surface.
8. The light diffusing lens of claim 1,
the light incident portion includes at least one second convex surface having a different curvature from the first convex surface.
9. The light diffusing lens of claim 1,
the distance between the ends of the lower surface is greater than the distance between the upper ends of the reflective portions.
10. The light diffusing lens of claim 1,
the vertex of the light incident portion and the vertex of the reflection portion are located on the same optical axis.
11. A light emitting device comprising:
a light emitting element; and
a light diffusion lens on the light emitting element and including a light incident portion, a reflection portion, and a light exiting portion,
wherein the light incident portion has a shape recessed from a lower portion of the light diffusion lens in an inner direction,
the reflection part has a shape recessed in an inner direction from an upper portion of the light diffusion lens,
the light emitting portion is an outer side of the light diffusion lens,
the light incident portion includes a convex surface protruding in an optical axis direction of the light diffusion lens.
12. A light emitting device comprising:
a light emitting element; and
a light diffusion lens on the light emitting element and including a light incident portion, a reflection portion, and a light exiting portion,
wherein the light incident portion has a shape recessed from a lower portion of the light diffusion lens in an inner direction,
the reflection part has a shape recessed in an inner direction from an upper portion of the light diffusion lens,
the light emitting portion is an outer side of the light diffusion lens,
the light incident portion includes a plane inclined toward the optical axis direction of the light diffusion lens as the light incident portion goes toward the inside of the light diffusion lens.
Technical Field
Exemplary embodiments relate generally to a light diffusion lens and a light emitting device including the same, and more particularly, to a light diffusion lens suitable for a backlight unit of a surface lighting apparatus and a light emitting device of a liquid crystal display.
Background
A typical display device includes a direct type backlight unit in which a plurality of light emitting elements are arranged at certain intervals under a substantially plate-shaped object such as a liquid crystal panel or a diffusion plate to illuminate the object. In order to achieve uniform illumination of an object using a plurality of light emitting elements alone, many light emitting devices are densely arranged, resulting in increased power consumption. Further, if there is a deviation in quality between the light emitting elements, the object exhibits uneven luminance. To reduce the number of light emitting elements, a light diffusion lens is provided to each light emitting element to promote light diffusion. In this structure, the light diffusion lens and at least one light emitting element corresponding thereto constitute one light emitting device.
Light emitting devices including typical light diffusing lenses have a beam angle distribution of about 80 ° or less with respect to an optical axis coincident with a central axis of the light emitting device. That is, although the conventional backlight unit includes the light emitting device having the light diffusion lens, in order to provide uniform surface light to the liquid crystal panel, the conventional backlight unit needs to maintain a sufficient distance between the light emitting device and the diffusion plate, thereby causing a limitation in realizing a slim structure.
Disclosure of Invention
[ problem ] to provide a method for producing a semiconductor device
Exemplary embodiments provide a light diffusing lens having an angular distribution of a light beam focused in a lateral direction thereof.
Exemplary embodiments provide a light emitting device configured to realize a slim structure of a backlight unit.
[ technical solution ] A
According to an aspect of the present disclosure, a light diffusion lens provided to a light emitting device includes: a light incident portion having a concave shape inwardly recessed from a lower portion of the light diffusion lens; a reflection part having a concave shape depressed inward from an upper portion of the light diffusion lens; and a light exit portion defined by an outer side surface of the light diffusion lens, wherein the light entry portion includes at least one first convex surface protruding in a direction of an optical axis defined by a straight line passing through a center of the light diffusion lens.
The first convex surface may have a gradually increasing convex shape in an inward direction of the light diffusion lens.
The first convex surface may extend from an inner vertex of the light incident portion with respect to the inner vertex of the light incident portion.
The light entry portion may further include a first plane extending from the first convex surface.
The first plane may extend in a downward direction or an upward direction of the first convex surface. Further, the light incident portion may include at least one second plane having a predetermined angle with respect to the first plane.
The light incident portion may include at least one second convex surface having a different radius of curvature from the first convex surface.
The light incident portion may further include a second plane in a perpendicular direction with respect to an optical axis of the light diffusion lens.
The light diffusion lens may further include a reflection member disposed on the second plane and reflecting light, or an absorption member disposed on the second plane and absorbing light.
The reflective portion may include at least one third convex surface protruding in the direction of the optical axis.
The reflection part may further include a third plane in a perpendicular direction with respect to an optical axis of the light diffusion lens.
The light diffusion lens may further include a reflection member disposed on the third plane and reflecting light, or an absorption member disposed on the third plane and absorbing light.
The light exit portion may include a fourth convex surface protruding in an outward direction of the light diffusion lens, and the light exit portion may further include a plane extending from the fourth convex surface.
An angle defined between the light-emitting portion and the lower surface of the light diffusion lens may be 90 ° or more.
An angle defined between the light exit portion and a lower surface of the light diffusion lens may be less than 90 °.
According to another aspect of the present disclosure, a light diffusion lens provided to a light emitting device includes: a light incident portion having a concave shape inwardly recessed from a lower portion of the light diffusion lens; a reflection part having a concave shape depressed inward from an upper portion of the light diffusion lens; and a light exit portion defined by an outer side surface of the light diffusion lens, wherein the light entry portion includes at least one first plane gradually narrowing in an inward direction of the light diffusion lens with respect to a direction of an optical axis defined by a straight line passing through a center of the light diffusion lens.
The light incident portion further includes at least one second plane extending from the first plane.
The first plane and the second plane may have different inclination angles with respect to the optical axis.
According to still another aspect of the present disclosure, a light emitting device includes: a light emitting element; and a light diffusion lens disposed on the light emitting element and including a light incident portion having a concave shape inwardly recessed from a lower portion of the light diffusion lens, a reflection portion having a concave shape inwardly recessed from an upper portion of the light diffusion lens, and a light exit portion defined by an outer side surface of the light diffusion lens, wherein the light incident portion includes a first convex surface protruding in a direction of an optical axis defined by a straight line passing through a center of the light diffusion lens.
According to still another aspect of the present disclosure, a light emitting device includes: a light emitting element; and a light diffusion lens disposed on the light emitting element and including a light incident portion having a concave shape inwardly recessed from a lower portion of the light diffusion lens, a reflection portion having a concave shape inwardly recessed from an upper portion of the light diffusion lens, and a light exit portion defined by an outer side surface of the light diffusion lens, wherein the light incident portion includes a first plane gradually narrowing in an inward direction of the light diffusion lens with respect to a direction of an optical axis defined by a straight line passing through a center of the light diffusion lens.
According to an aspect of the present disclosure, a light emitting device may include: a light emitting element; and a light diffusion lens on the light emitting element and including a light incident portion, a reflection portion, and a light exit portion, wherein the light incident portion has a shape that is recessed from a lower portion of the light diffusion lens in an inner direction, the reflection portion has a shape that is recessed from an upper portion of the light diffusion lens in the inner direction, the light exit portion is an outer side of the light diffusion lens, and the light incident portion includes a convex surface that is convex in an optical axis direction of the light diffusion lens.
According to an aspect of the present disclosure, a light emitting device includes: a light emitting element; and a light diffusion lens which is positioned on the light emitting element and includes a light incident portion, a reflection portion, and a light exit portion, wherein the light incident portion has a shape recessed from a lower portion of the light diffusion lens in an inner direction, the reflection portion has a shape recessed from an upper portion of the light diffusion lens in an inner direction, the light exit portion is an outer side of the light diffusion lens, and the light incident portion includes a plane inclined more toward an optical axis direction of the light diffusion lens as it goes toward the inside of the light diffusion lens.
[ PROBLEMS ] the present invention
According to an exemplary embodiment, the light emitting device comprises a light diffusing lens, wherein the light diffusing lens comprises a light entry portion providing uniform light to the entire surface of the reflective portion, a reflective portion reflecting light towards the light exit portion, and a light exit portion emitting light in an outward direction of the light diffusing lens, thereby providing an angular distribution of the light beam focused in a lateral direction of the light emitting device. With this structure, the light emitting device can advantageously realize a slim backlight unit.
Drawings
Fig. 1 is an exploded perspective view of a display device including a backlight unit according to a first exemplary embodiment.
Fig. 2 is a sectional view of the display device taken along line I-I' of fig. 1.
Fig. 3 is a perspective view of a light emitting device according to a first exemplary embodiment.
Fig. 4 is a sectional view of the light emitting device taken along line II-II' of fig. 3.
Fig. 5 is a diagram of a beam angle distribution of the light emitting apparatus according to the first exemplary embodiment.
Fig. 6 is a sectional view of a light diffusion lens according to a second exemplary embodiment.
Fig. 7 is a cross-sectional view of other exemplary embodiments of a light entry portion according to the present disclosure.
Fig. 8 is a sectional view of a light diffusion lens according to a third exemplary embodiment.
Fig. 9 is a sectional view of a light diffusion lens according to a fourth exemplary embodiment.
Fig. 10 is a sectional view of a light diffusion lens according to a fifth exemplary embodiment.
Fig. 11 is a diagram of a beam angle distribution of a light emitting device according to a fifth exemplary embodiment.
Fig. 12 is a sectional view of a light diffusion lens according to a sixth exemplary embodiment.
Fig. 13 is a diagram of a beam angle distribution of a light-emitting device according to a sixth exemplary embodiment.
Fig. 14 is a sectional view of a light diffusion lens according to a seventh exemplary embodiment.
Detailed Description
Hereinafter, exemplary embodiments will be described in more detail with reference to the accompanying drawings. The following embodiments are provided by way of example so as to fully convey the spirit of the disclosure to those skilled in the art to which the disclosure pertains. Accordingly, the present disclosure is not limited to the embodiments disclosed herein, but may also be embodied in different forms. In the drawings, the width, length, thickness, and the like of elements may be exaggerated for clarity and description. Throughout the specification, the same reference numerals denote the same elements having the same or similar functions.
Fig. 1 is an exploded perspective view of a display device including a backlight unit according to a first exemplary embodiment, and fig. 2 is a sectional view of the display device taken along line I-I' of fig. 1.
Referring to fig. 1 and 2, the display device according to the first exemplary embodiment includes a
The
A gate driving Printed Circuit Board (PCB)112 is disposed at one edge of the
The backlight unit 120 includes a
The
Although the substrate 150 is shown to be disposed on the lower surface of the
The plurality of light emitting devices 160 include a plurality of first
Each of the first
Each of the second
In the backlight unit 120 according to the exemplary embodiment, since mixing and diffusion of light are facilitated by the first and second
Although the backlight unit 120 has been described as including both the first and second
Details of the second
Fig. 3 is a perspective view of a light emitting device according to a first exemplary embodiment, fig. 4 is a sectional view of the light emitting device taken along line II-II' of fig. 3, and fig. 5 is a graph of a beam angle distribution of the light emitting device according to the first exemplary embodiment.
Referring to fig. 3 to 5, the
The light emitting element 250 includes a printed circuit board, wherein the printed circuit board includes a conductive pattern (not shown) formed on an upper surface thereof such that a terminal of the light emitting element 250 is coupled to the conductive pattern. In addition, the printed circuit board may include a reflective layer formed on an upper surface thereof. The printed circuit board may be a metal core pcb (mcpcb) based on metal or insulating material such as FR4 with good thermal conductivity. Although not shown in the drawings, a heat sink may be provided on the lower surface of the printed circuit board to dissipate heat from the light emitting element 250.
The light emitting element 250 may be composed of a light emitting diode chip (not shown) including a wavelength conversion layer (not shown), and the light emitting diode chip may be directly mounted on a printed circuit board. In the light emitting element 250, a light emitting diode chip (not shown) may be placed in a housing having a cavity, and lead terminals of the light emitting diode chip exposed from the housing may be bonded to a printed circuit board.
The
The
The
The
The
The
Fig. 6 is a sectional view of a light diffusion lens according to a second exemplary embodiment.
As shown in fig. 6, the
The
The
Fig. 7 is a cross-sectional view of other exemplary embodiments of a light entry portion according to the present disclosure.
As shown in fig. 7, the structure of the light incident portion according to the present disclosure may be modified in various ways. Referring to fig. 7(a), the light incident portion may include a
With respect to the inner vertex of the light incident portion, the
Referring to fig. 7(b), the light incident portion includes a first
Referring to fig. 7(c), the light incident portion includes a
The
Referring to fig. 7(d), the light incident portion includes a first
The first
Referring to fig. 7(e), the light incident portion includes a first
With respect to the vertex of the light incident portion, the first
The
That is, the first to
Referring to fig. 7(f), the light incident portion includes a protruding
The protruding
Although not shown in the drawings, the light incident portion may be constituted by a lower surface of the light incident surface. That is, the light incident portion may be a plane on the lower surface of the light incident surface of the lens, rather than forming a separate light incident portion having a concave shape or a convex shape.
It should be understood that the shape of the light incident surface is not limited to the shape as shown in fig. 7, and the light incident surface may be composed of three or more convex surfaces or flat surfaces, or a combination of three or more convex surfaces and flat surfaces.
Fig. 8 is a sectional view of a light diffusion lens according to a third exemplary embodiment.
Referring to fig. 8, the light diffusion lens 710 according to the third exemplary embodiment includes a light incident portion 720, a reflection portion 730, and a light exit portion 740.
The light incident portion 720 and the light exit portion 740 are the same as those of the light diffusion lens 210 (see fig. 3) according to the first exemplary embodiment, and detailed descriptions thereof will be omitted.
The reflection part 730 is located at an upper portion of the light diffusion lens 710 and has a concave shape recessed inward from the upper portion of the light diffusion lens with respect to an optical axis L defined by a straight line passing through the center of the light diffusion lens 710. The reflection portion 730 reflects light received from the light incident portion 720 toward the light exit portion 740. The reflective part 730 includes first to third convex surfaces 730a, 730b, and 730c protruding in the direction of the optical axis L.
The first convex surface 730a may extend from an inner vertex of the reflective part 730. The second convex surface 730b may extend from the first convex surface 730 a. The third convex surface 730c may extend from the second convex surface 730 b. The first to third convex surfaces 730a, 730b and 730c have different radii of curvature.
Although the reflective part 730 is illustrated as including the first to third convex surfaces 730a, 730b and 730c in the third exemplary embodiment, one of the first to third convex surfaces 730a, 730b and 730c may be replaced with a concave surface.
In the light diffusion lens 710 according to the third exemplary embodiment, the first to third convex surfaces 730a, 730b and 730c having different radii of curvature provide a wide distribution of paths of light reflected by the reflection portion 730, and thus the light diffusion lens may have a beam angular distribution focused in a lateral direction of the light emitting device.
Fig. 9 is a sectional view of a light diffusion lens according to a fourth exemplary embodiment.
Referring to fig. 9, the
The
The light incident portion 820 is located at a lower portion of the
The
In the
Fig. 10 is a sectional view of a light diffusion lens according to a fifth exemplary embodiment, and fig. 11 is a graph of a beam angle distribution of a light emitting device according to the fifth exemplary embodiment.
Referring to fig. 10 and 11, the
The
The
The light emitting device according to the fifth exemplary embodiment has a light emission intensity peak at an angle of about 100 ° or less from the optical axis L, and thus provides a wide distribution of light by light propagation.
The light emitting device according to the fifth exemplary embodiment includes the
Fig. 12 is a sectional view of a light diffusion lens according to a sixth exemplary embodiment, and fig. 13 is a graph of a beam angle distribution of a light emitting device according to the sixth exemplary embodiment.
Referring to fig. 12 and 13, the
The
The
The light emitting device according to the sixth exemplary embodiment has a light emission intensity peak at an angle of about 100 ° or more from the optical axis L, and thus provides a wide distribution of light by light propagation.
The light emitting device according to the sixth exemplary embodiment includes a
Fig. 14 is a sectional view of a light diffusion lens according to a seventh exemplary embodiment.
Referring to fig. 14, the
The
The
As such, with the light emitting apparatus according to the seventh exemplary embodiment, the beam angular distribution of the light emitted through the light
Although a few exemplary embodiments are disclosed herein, it should be understood that these embodiments are not intended to be exclusive. For example, the individual structures, elements or features of a particular embodiment are not limited to that particular embodiment and may be applied to other embodiments without departing from the spirit and scope of the present disclosure.
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