KR101235345B1 - Lens for light emitting diode, back light unit and display device including the same - Google Patents

Abstract

PURPOSE: A lens for a light-emitting diode, back light unit and display device including the same are provided to easily modify the entire shapes to be most suitable for light distribution design. CONSTITUTION: A lens(10) includes a bottom plane(13), a top plane(12) and a side plane(16) connecting the bottom plane and top plane. The bottom plane includes an incident plane(17) in which an emitted light is incident from a light-emitting diode(11). The top plane includes an exit plane(20) outputting incident light emitted from the light-emitting diode. The exit plane includes a first exit plane(30) and a second exit plane(40) on the top plane. A groove(14) is formed in the center of the bottom plane to accommodate a light-emitting diode.

Description

Lens for light emitting diode, backlight unit and display device having same {LENS FOR LIGHT EMITTING DIODE, BACK LIGHT UNIT AND DISPLAY DEVICE INCLUDING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode lens, a backlight unit including the same, and a display device. Specifically, a light emitting diode lens is provided on an upper surface of the light emitting diode. The present invention relates to a light emitting diode lens, a back light unit (BLU) and a display device having the same.

In general, a display device used as a computer monitor or TV is provided with a liquid crystal display (LCD). Since the liquid crystal display does not emit light by itself, a separate light source is required. .

As a light source for a liquid crystal display, a plurality of fluorescent lamps such as Cold Cathode Fluorescent Lamp (CCFL) and External Electrode Fluorescent Lamp (EEFL) are used, or a plurality of Light Emitting Diodes (LEDs) are used. Such a light source is provided with a light guide plate, a plurality of optical sheets, a reflecting plate, and the like in a back light unit (BLU).

Recently, the light emitting diode of the light source has a low power consumption, good durability and low manufacturing cost, attracting attention as the next generation light source.

However, when a light emitting diode is used as a light source, the light tends to concentrate in a narrow area and diverge, and in order to apply it to a surface light source such as a display device, it is necessary to distribute the light evenly over a wide area.

Therefore, in recent years, researches on lenses for light emitting diodes that perform these functions have been actively conducted. Among them, representative prior arts are Korean Patent Nos. 10-0971639, Korean Patent Nos. 10-0789835, and Korean Patent Nos. 10-1080355.

Lenses for light emitting diodes according to the prior arts have a continuous curved surface in order to evenly disperse the light emitted from the light emitting diodes. Thus, when the upper surface is a continuous curved surface, there is a problem that light distribution design is not easy. . The light distribution design for evenly distributing the light emitted from the light emitting diode needs to have a different light distribution according to the light emitting diode's specification and the purpose of light distribution. When the upper surface is a continuous curved surface, the light distribution is changed accordingly. This is because it is not easy to design a suitable continuous curved surface.

In addition, the lens for light emitting diodes according to the prior arts has a problem that the overall volume of the lens becomes larger because the light emitting diode lens has a convex curved shape as it moves away from the central axis of the light emitting diode.

In addition, the overall shape of the light emitting diode lens according to the prior art is inevitably made, there is a problem that it is not easy to change the overall shape to the most suitable form according to various light distribution design.

Therefore, the problem to be solved by the present invention is to facilitate the light distribution design to evenly distribute the light emitted from the light emitting diode, to reduce the overall volume (volume), a new form that can easily change the overall shape in various forms A lens for a light emitting diode is provided.

The light emitting diode lens according to the present invention is a light emitting diode lens for evenly dispersing light emitted from a light emitting diode (LED), the incident surface to which the light emitted from the light emitting diode is incident, and the incident And a light emitting surface for emitting light incident on the surface, wherein the light emitting surface is provided in a central region including a central axis of the light emitting diode and emits light emitted from the light emitting diode and incident on the incident surface from the central axis. A first emission surface having a plurality of discontinuous refraction surfaces having a concave shape to be refracted in a distant direction, and provided around the first emission surface, the light emitted from the light emitting diode and incident to the entrance surface; A number of discontinuous refraction surfaces with convex shapes are provided to refract the direction away from the central axis. The can be done, including the second exit surface.

On the other hand, the backlight unit according to the present invention is a backlight unit (BLU) using a light emitting diode (Light Emitting Diode, LED) as a light source, the light emitting diode having the configuration as described above on the light emitting diode A lens is provided for evenly dispersing the light emitted from the light emitting diode.

In addition, the display device according to the present invention is a display device using a light emitting diode (LED) as a light source, the light emitting diode lens having the above-described configuration on the light emitting diode It is characterized in that it evenly distributes the light emitted from the light emitting diode.

On the other hand, the cylinder lens for a light emitting diode according to the present invention is provided on a plurality of light emitting diodes (LED) arranged in one direction for a light emitting diode having a constant cross-section in the longitudinal direction to evenly distribute the light emitted from the light emitting diode In the cylindrical lens, the shape of the vertical cross section of the light emitting diode cylinder lens is characterized in that the shape of the vertical cross section of the light emitting diode lens as described above.

According to the lens for a light emitting diode according to the present invention, it is possible to facilitate the light distribution design to evenly distribute the light, and to reduce the overall volume and to easily change the overall shape to the shape most suitable for the light distribution design. .

1 is a vertical cross-sectional view showing a light emitting diode lens according to an embodiment of the present invention,
FIG. 2 is an enlarged view of a portion 'A' of FIG. 1;
3 is an enlarged view of a portion 'B' of FIG. 1;
4 is an enlarged view of a portion 'C' of FIG. 1;
FIG. 5 is an enlarged view of a portion 'D' of FIG. 1;
6 is an enlarged view of a portion 'E' of FIG. 1;
FIG. 7 is an enlarged view of a portion 'F' of FIG. 1;
8 is an enlarged view of a portion 'G' of FIG. 1;
9 is a diagram illustrating a light distribution of a general light emitting diode,
Fig. 10 is a chart showing light distribution by another light emitting diode lens according to the present invention;
11 is a vertical cross-sectional view showing a light emitting diode lens according to another embodiment of the present invention,
12 to 17 is a vertical cross-sectional view showing various embodiments of the shape of a lens for a light emitting diode according to the present invention,
18 is a perspective view showing an embodiment of a cylinder lens for a light emitting diode according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. Rather, the intention is not to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and substitutions that are consistent with the spirit of the invention as defined by the claims.

In the accompanying drawings, the thickness and the size are exaggerated for clarity of description and the present invention is not limited by the relative size or thickness shown in the attached drawings.

The present invention is characterized by dividing the area of the emission surface from which light emitted from a light emitting diode (LED) is emitted into at least two or more areas, and forming a configuration for evenly dispersing light in each area. A light emitting diode lens is described. The present invention also relates to a back light unit (BLU) and a display device including such a light emitting diode lens. However, other configurations of the backlight unit and the display device except for the light emitting diode lens according to the present invention can be easily carried out by those of ordinary skill in the art, detailed description thereof Is omitted.

1 is a vertical sectional view showing a lens for a light emitting diode according to an embodiment of the present invention.

Referring to FIG. 1, a light emitting diode lens 10 according to an embodiment of the present invention includes a bottom surface 13, an upper surface 12, and a side surface 16 connecting the lower surface 13 and the upper surface 12. It can be done by.

The bottom surface 13 has an incident surface 17 through which light emitted from the light emitting diodes 11 is incident, and the upper surface 12 has light emitted from the light emitting diodes 11 and incident on the incident surface 17. An emission surface 20 for emitting the light is provided. Here, the incident surface 17 may be the entire bottom surface 13, and the emission surface 20 may be the entire upper surface 13 or the upper surface 13 and the side surface 14.

The center of the bottom surface 13 may be provided with a groove 14 for accommodating the light emitting diode 11, in which case the incident surface 17 may be formed as an inner surface of the groove 14. In addition, as shown in FIG. 1, the cross section of the groove 14 may have a spherical cross-sectional shape. Preferably, the light emitted from the light emitting diode 11 is primarily in a direction away from the central axis 15. It may also consist of an aspherical surface, such as the shape of a convex cross section to be refracted. Of course, the light emitting diode lens 10 according to the present invention may not be provided with a groove 14 on the bottom surface 13, the present invention is not limited thereto.

In addition, the upper surface 12 may be formed of an aspherical surface or a spherical surface on a vertical cross section, and when the aspherical surface is formed of a curved surface, a flat straight line or a predetermined angle inclined straight line, the present invention is not limited thereto. .

The emission surface 20 may be provided to divide the upper surface 12 into at least two areas and have a configuration for evenly dispersing light in each area. Hereinafter, a specific configuration of the emission surface 20 will be described. And various embodiments thereof will be described in detail.

For convenience of explanation, the divergence angle θ of the light emitted from the light emitting diodes 11 is defined as an inclination angle with respect to the central axis 15, and the light emitting diodes 11 are point light sources. The divergence angle [theta] of all divergent light is defined as an angle diverging from the center point, which is an intersection point of the central axis 15 and the light emitting diode 11. At this time, the incident angle of the light incident on the upper surface 12 may be the same as the divergence angle (θ) of the light emitted from the light emitting diode 11, the cross section of the groove 14 provided on the bottom surface 13 is an aspherical surface In the case where the light emitted from the light emitting diodes 11 is refracted by the incident surface 17 formed as the inner surface of the groove 14, the incident angle of the light incident on the upper surface 12 may be different from the divergence angle θ. In the present specification, the incident angle of light incident on the upper surface 12 is used as a meaning including all the above cases.

The emission surface 20 is preferably provided to have a different configuration according to the range of the divergence angle (θ) of the light emitted from the light emitting diodes 11 in order to more evenly distribute the light emitted from the light emitting diodes (11). For this purpose, the exit surface 20 may include a first exit surface 30 and a second exit surface 40 provided on the upper surface 12.

2 to 5 are views for explaining the first exit surface and the second exit surface, FIG. 2 is an enlarged view of a portion 'A' of FIG. 1, FIG. 3 is an enlarged view of a portion 'B' of FIG. 4 is an enlarged view of a portion 'C' of FIG. 1, and FIG. 5 is an enlarged view of a portion 'D' of FIG. 1.

1 to 5, the first emission surface 30 is provided at a central region including the central axis 15, and emits light emitted from the light emitting diodes 11 and incident on the incident surface 17. A plurality of discontinuous refractive surfaces 32 having a concave shape may be provided to refract the direction away from the central axis 15.

In addition, the second emission surface 40 is provided around the first emission surface 30, and the light emitted from the light emitting diode 11 and incident on the incident surface 17 is separated from the central axis 15. A plurality of discontinuous refracting surfaces 42 having convex shapes may be provided to refract in a direction.

The first emission surface 30 is an arbitrary first emission angle θ ₁ from light emitted in parallel with the central axis 15 among light emitted from the light emitting diode 11 (emission angle θ = 0 °). Is evenly distributed to the light emitted by the second emission surface, the second exit surface 40 is the light emitted from the light emitting diode 11 from the light emitted at the first divergence angle (θ ₁ ) It is for evenly dispersing the light in the range up to the light emitted at an arbitrary second diverging angle θ ₂ larger than the first diverging angle θ ₁ .

In detail, as shown in FIG. 2, the first emission surface 30 includes a plurality of discontinuously formed refracting surfaces 32 for refracting light S1 incident on the upper surface 12, and the respective discontinuous surfaces. A connection surface 34 may be provided to connect the refractive surface 32, and the refractive surface 32 may emit light S1 having a small divergence angle (0 ≦ θ ≦ θ ₁ ) from the light emitting diodes 11. It may be provided to have a concave shape with respect to the upper surface 12 on the vertical cross-section to be refracted in a direction away from the central axis 15, preferably, a concave shape facing upwards away from the central axis 15.

In addition, as shown in FIG. 3, the second emission surface 40 includes a plurality of discontinuously formed refracting surfaces 42 for refracting light S2 incident on the upper surface 12, and the respective discontinuous surfaces. A connection surface 44 may be provided to connect the refractive surface 42, and the refractive surface 42 may emit light having a divergence angle θ ₁ ≦ θ ≦ θ ₂ of the light emitting diode 11. S2) may be provided to have a convex shape with respect to the upper surface 12 on the vertical cross-section so as to be deflected in a direction away from the central axis 15, preferably, a convex shape facing upwards away from the central axis 15. have.

As described above, the reason why the refractive surface 32 of the first exit surface 30 is concave with respect to the upper surface 12 and the refractive surface 42 of the second exit surface 40 in the convex shape is the first. The light incident on the exit surface 30 has a small divergence angle and needs to be refracted at a large refractive angle in a direction away from the central axis 15. The light incident on the second exit surface 40 has a relatively divergent angle. This is because it is necessary to be refracted at a smaller angle of refraction in a direction away from the central axis 15 as large light. According to the first and second exit surfaces 30 and 40, the light emitted from the light emitting diodes 11 is evenly distributed. It can be distributed.

Here, one of the refracting surfaces and any one of the connecting surfaces continuous to the one of the refracting surfaces is a segment, and the height h of the segment is a low point and a high point of the refracting surface constituting one segment. As the height difference of, the pitch p of the segment may be defined as the length from one end of the refracting surface constituting one segment to the other end of the connecting surface.

At this time, the height (h) and the pitch (p) of each of the segments (36, 46) may be provided constant or not provided, but the present invention is not limited thereto. In addition, although the shape in which the respective segments 36 and 46 are continuously connected is shown in the drawing, the present invention is not limited thereto, and predetermined intervals are formed between the segments 36 and 46 and are sequentially connected. It could also be in form. However, in order to evenly distribute the light incident on the upper surface 12 and reduce the light loss, it is preferable that each of the segments 36 and 46 is continuously and sequentially connected without a predetermined interval. something to do.

Similarly, as shown in FIG. 4, the segment of the first exit surface 30 is formed in the first inflection region (or the first inflection point) 23 of the first exit surface 30 and the second exit surface 40. 36 and the segment 46 of the second exit surface 40 may be continuously connected, but a predetermined interval may be formed so that no segment is formed in the first inflection region 23. However, in order to uniformly disperse the light incident on the upper surface 12 and reduce the light loss, as shown in the drawing, the segment 36 and the first 36 of the first exit surface 30 are formed in the first inflexion region 23. It is preferable that the segments 46 of the two exit surfaces 40 are connected continuously.

Meanwhile, as shown in FIG. 5, the first emission surface 30 facing each other with respect to the central axis 15 on the vertical section at the center of the upper surface 12 corresponding to the central axis 15 of the light emitting diode 11. One recess 24 may be formed by the two segments 36 of.

In addition, the light emitting diode lens 10 according to the present invention, as shown in FIG. 1, it is preferable that the emission surface 20 is symmetrical with respect to the central axis 15 on a vertical cross section, although not shown in the drawing. In the case where 10 is formed in a planar circular shape, the exit surface 20 is preferably formed in the form of a groove having a circular band shape with respect to the central axis 15.

Meanwhile, the emission surface 20 may further include a third emission surface 50 provided on the upper surface 12, and the third emission surface 50 will be described in detail with reference to FIGS. 6 and 7. Explain.

6 is an enlarged view of a portion 'E' of FIG. 1, and FIG. 7 is an enlarged view of a portion 'F' of FIG. 1.

6 and 7, the third exit surface 50 is the second divergence angle (θ ₂₎ from the light emitted from the light emitted from the light emitting diode 11 in the second angle of divergence (θ ₂₎ In order to evenly distribute the light in the range up to the light emitted at a larger arbitrary third divergence angle θ ₃ , it may be provided around the second exit surface 40.

In detail, as shown in FIG. 6, the third emission surface 50 includes a plurality of discontinuously formed refracting surfaces 52 for refracting light S3 incident on the upper surface 12, and the respective discontinuous surfaces. The connecting surface 54 connecting the refractive surface 52, that is, one segment 56 may be provided in a sequential manner, and the refractive surface 52 is a refractive surface of the second exit surface 40 on a vertical cross section ( It may be provided to have a convex shape in the opposite direction to 42), that is, a convex shape toward the lower side away from the central axis (15). Therefore, the segment 56 of the third exit surface 50 may have a shape symmetrical with the segment 46 of the second exit surface 40.

As such, the reason why the refractive surface 52 of the third exit surface 50 is provided in the convex shape in the opposite direction to the refractive surface 42 of the second exit surface 40 is because of the refractive surface of the third exit surface 50. Since the light S3 to be refracted by 52 has light having a relatively large divergence angle θ ₂ ≦ θ ≦ θ ₃ in the light emitting diode 11 and is incident on the upper surface 12, the central axis 15 This is because refracting the light incident on the upper surface 12 while maintaining the incidence angle of the light incident on the upper surface 12 rather than refracting away from the light may cause the light to be more evenly dispersed.

In this case, as shown in FIG. 7, the refractive surface of the second emission surface 40 is formed in the second inflection region (or the second inflection point) 25 of the second emission surface 40 and the third emission surface 50. One convex portion 57 formed by directly connecting the 42 and the refractive surface 52 of the third emission surface 50 may be provided. Of course, like the first inflection region 23, the second inflection region 25 may include the segment 46 and the third emission of the second exit surface 40 without the one convex portion 57. Some spacing may be formed between the segments 56 of the face 50.

Meanwhile, the exit surface 20 may further include a fourth exit surface 60 provided on the side surface 16, and the fourth exit surface 60 will be described in detail with reference to FIG. 8.

FIG. 8 is an enlarged view of a portion 'G' of FIG. 1.

Referring to FIG. 8, the fourth emission surface 60 is provided on the side surface 16 to evenly distribute the light S4 incident on the side surface 16, and the light emitted from the light emitting diodes 11. Among the light emitted from the third divergent angle (θ ₃ ) to the light emitted in a direction perpendicular to the central axis 15 of the light emitting diode 11 (divergence angle (θ) = 90 °) When the third emission surface 30 is not formed on the upper surface 12, the light emitting diodes 11 may emit light from the light emitted from the light emitting diodes 11 at a second diverging angle θ ₂ . It may be for evenly dispersing the light in the range up to the light diverging perpendicular to the central axis 15 of (the divergence angle θ = 90 °). In this case, the second inflection region 25 may be a connection portion between the upper surface 12 and the side surface 16, that is, the edge of the upper surface 12.

In detail, as shown in FIG. 8, the fourth emission surface 60 includes a plurality of discontinuously formed refracting surfaces 62 for refracting light S4 incident on the side surface 16, and the respective discontinuous surfaces. The connecting surface 64 connecting one of the refractive surfaces 62, that is, one segment 66 may be provided in a sequential manner. The refractive surface 62 may have a convex shape with respect to the side surface 16 on a vertical cross section. Similarly, similar to the refracting surface 52 of the third exit surface 50 may be provided to have a convex shape toward the lower side away from the central axis 15.

The reason why the refractive surface 62 of the fourth exit surface 60 is formed similar to the refractive surface 52 of the third exit surface 50 is that the refractive surface 62 of the fourth exit surface 60 is refracted. Since the light S4 to be generated is also light incident on the side surface 16 having a relatively large divergence angle (θ ₂ ≦ θ ≦ θ ₃ or θ ₂ ≦ θ ≦ 90 °) in the light emitting diode 11, This is because refracting the light incident on the side surface 16 or refracting the light upwardly rather than refracting away from (15) can disperse the light evenly.

In addition, when the fourth emission surface 60 is provided on the side surface 16, the light emitted from the light emitting diodes 11 may be more evenly dispersed, and the third emission surface 50 may not be provided. It is possible to further reduce the overall size and volume of 10).

FIG. 9 is a chart showing a light distribution of a general light emitting diode, and FIG. 10 is a chart showing a light distribution of a light emitting diode lens according to the present invention.

As it is seen in Figs. 9 and 10, the light distribution by the light emitting diode lens 10 according to the present invention, light distribution of the light emitting diode 11 has a shape of substantially circular peak light at a predetermined angle (I _peak) To emit.

Here, the angle at which the peak light (I _peak ) is emitted depends on the specification of the light emitting diode (11) and the light distribution purpose. In the lens 10 according to the present invention, the peak light (I _peak ) is emitted. angle to the second when the light distribution design and the divergence may be for each (θ _2), Thus, the second angle of divergence (θ ₂₎ at an angle which emits peak light (I _peak), light emission in accordance with the present invention When the distribution distribution to be implemented as the diode lens 10 is determined, a second divergence angle θ ₂ is determined accordingly, and the emission surface 20 may be formed based on the second divergence angle θ ₂ . Therefore, the light distribution design can be made very easily.

For example, when the light emitting diode lens 10 according to the present invention is provided in the backlight unit, the first divergence angle θ ₁ and the first inflection region 23 may exist within a range of about 10 to 20 °. The second divergence angle θ ₂ and the second inflection region 25 may be in a range of about 60 ° to about 80 °.

On the other hand, the connecting surface (34, 44, 54, 64) is for connecting the discontinuous refracting surface (32, 42, 52, 62), the shape of which is irrespective of any shape, made of a spherical or aspherical surface in the vertical section It may also be made of the normal of the upper surface 12 and the side surface 16.

11 is a vertical cross-sectional view showing a light emitting diode lens according to another embodiment of the present invention.

Referring to FIG. 11, the light emitting diode lens 10 according to the present exemplary embodiment is upward from the center of the groove 14 to refract light emitted from the light emitting diode 11 in a direction away from the central axis 15. The concave refractive portion 70 may be further included.

The refracting unit 70 diverges from the light emitted from the light emitting diode 11 to the first divergent angle θ ₁ from light emitted in parallel with the central axis 15 (divergence angle θ = 0 °). In order to more evenly distribute the light in the range up to the light, that is, the incident light (S5) to the center region including the central axis 15, the refracting portion 70 may be made of a spherical or aspherical surface in the vertical section , Preferably it may be made of a straight line inclined downward based on the curved surface or the central axis (15).

As shown in FIG. 9, since the light distribution of the light emitting diodes 11 is substantially circular, light emitted from the light emitting diodes 11 is concentrated on the central axis 15. Due to the distribution distribution, a spot is generated in the central area including the central axis 15 of the distribution of light distribution by the lens 10 for light emitting diodes, and the refracting portion 70 is for preventing such a spot phenomenon. As shown in FIG. 11, when the refracting portion 70 is concave upward, the light emitted from the light emitting diode 11 is further refracted in a direction away from the central axis 15, and thus, the central axis 15 is formed. It is possible to further reduce the spot phenomenon in the central region including a.

12 to 17 are vertical cross-sectional views illustrating various embodiments of a shape of a lens for a light emitting diode according to the present invention.

The upper surface 12 of the light emitting diode lens 10 according to the present invention may be made of a spherical surface or an aspherical surface in a vertical section, and may be made of a curved surface in the case of an aspherical surface, but is made of a straight line in a vertical section than from a manufacturing side. It may be desirable.

As described above, when the upper surface 12 is formed in a straight line on the vertical section, as shown in FIG. 1, the upper surface 12 may be formed as a flat straight line intersecting with the central axis 15. Likewise, it may be made of a straight line inclined downward based on the central axis 15.

However, when the upper surface 12 is a flat straight line as shown in FIG. 1, some of the light refracted by the refracting surface of one segment may interfere with the refracting surface of another adjacent segment, resulting in light loss. As shown in FIG. 12, when the upper surface 12 is formed in a straight line inclined downward by a predetermined angle, there is an advantage of preventing light loss due to interference.

In addition, the shape of the light emitting diode lens 10 according to the present invention, as shown in Figs. 1 and 12 may be made of one continuous surface without the inflection point, as shown in Figs. As described above, the inflection point may be provided to have at least one inflection point. In this case, the inflection point may be the first inflection area 23 which is an inflection area of the first exit surface 30 and the second exit surface 40. In addition, the shape of the light emitting diode lens 10 according to the present invention may be provided to have an inflection point in the second inflection region 25 which is an inflection region of the second emission surface 40 and the third emission surface 50. However, as shown in the figure, it is more preferable that the second exit surface 40 and the third exit surface 50 consist of one continuous surface having no inflection point.

As shown in FIG. 13, one embodiment of the lens 10 for a light emitting diode according to the present invention includes the first emission surface 30 having a straight line inclined upwardly with respect to the central axis 15 on a vertical section. The second exit surface 40 is formed of a flat straight line connected to the first exit surface 30 on a vertical cross section, or as shown in FIG. 14, the second exit surface 40 is formed of a straight line inclined downward. Can be.

As such, when the first emission surface 30 has a straight line that is inclined upwardly based on the central axis 30, that is, the concave shape is downward, the centralized light 15 is concentrated at the center of the light emitting diode 11. Since it can disperse | distribute more evenly in the direction away from), it is preferable.

Another embodiment of the lens 10 for a light emitting diode according to the present invention is as shown in Figure 15 the first exit surface 30 is made of a flat straight line orthogonal to the central axis 15 on the vertical cross-section and the second exit The surface 40 may be formed as a straight line inclined downward connected to the first exit surface 30 on the vertical section.

In another embodiment of the light emitting diode lens 10 according to the present invention, as shown in FIG. 16, the first emission surface 30 is formed of a straight line inclined downward with respect to the central axis 15 on a vertical section. The second exit surface 40 consists of a flat straight line connected to the first exit surface 30 on a vertical section, or as shown in FIG. 17, the second exit surface 40 is connected to the first exit surface 30. It may also consist of a straight line inclined downwardly connected.

Of course, each of the first exit surface 30, the second exit surface 40, and the third exit surface 50 may be formed of a curved surface rather than a straight line on a vertical section, and may also be formed of a spherical surface. Will not be limited to that.

As such, the overall shape of the light emitting diode lens 10 according to the present invention may be formed in various forms, and thus it is easy to change the shape to the most suitable shape for the purpose of each light distribution design.

On the other hand, the light emitting diode lens 10 according to the present invention is provided on a plurality of light emitting diodes (LEDs) arranged in one direction, the cylinder having a constant cross section in the longitudinal direction to evenly distribute the light emitted from the light emitting diodes It may also be in the form of a lens.

18 is a perspective view showing one embodiment of a cylinder lens for light emitting diode according to the present invention.

Referring to FIG. 18, the cylindrical lens 100 for a light emitting diode according to the present embodiment has a vertical cross section constant in the longitudinal direction, and the vertical cross section of the light emitting diode lens 10 according to the present invention as described above. It can be made the same as the vertical cross section, and thus, the detailed description thereof uses the detailed description in the above embodiments.

However, the light emitting diode cylinder lens 100 according to the present embodiment has a groove for accommodating each of the plurality of light emitting diodes 11 in which the shape of the groove 102 for accommodating the light emitting diodes 11 is arranged in one direction. It may be provided at a predetermined interval, but preferably may be formed long in the longitudinal direction to accommodate the plurality of light emitting diodes 11 as shown in FIG.

As described above, the present invention is configured to divide the area of the emission surface from which light emitted from the light emitting diode (LED) is emitted into at least two or more regions, and to evenly distribute the light in each region. The present invention relates to a light emitting diode lens that facilitates light distribution design, can reduce overall volume, and can easily change its overall shape, and the embodiment can be modified in various forms. Accordingly, the present invention is not limited to the embodiments disclosed herein, and all changes which can be made by those skilled in the art are also within the scope of the present invention.

10 lens 11 light emitting diode
12: top face 13: bottom face
14: groove 15: central axis
16: side 17: incident surface
20: exit surface 30: first exit surface
40: second exit plane 50: third exit plane
60: fourth exit surface 32, 42, 52, 62: refractive surface
34,44,54,64: connecting surface 36,46,56,66: segment
70: refraction

Claims (12)

In the light emitting diode lens for evenly dispersing the light emitted from the light emitting diode (LED),
The lens has a bottom surface and an upper surface, the bottom surface is provided with an incident surface on which light emitted from the light emitting diode is incident, the upper surface is provided with an emission surface on which light incident on the incident surface is emitted,
The exit surface,
It is provided in the center region of the upper surface including the central axis of the light emitting diode, and has a concave shape with respect to the upper surface so as to refracted light emitted from the light emitting diode incident on the incident surface in a direction away from the central axis A first exit surface provided with a plurality of discontinuous refractive surfaces,
A plurality of discontinuities provided around the first emission surface of the upper surface and having a convex shape with respect to the upper surface so as to refracted light emitted from the light emitting diode and incident on the incident surface away from the central axis; A light emitting diode lens comprising a second exit surface provided with one refractive surface. The method of claim 1,
The refracting surface of the first exit surface has a concave shape facing upwards away from the central axis, and the refracting surface of the second exit surface has a convex shape facing upwards away from the central axis Lens for diode. The method of claim 2,
The exit surface is provided around the second exit surface, characterized in that it further comprises a third exit surface provided with a plurality of discontinuous refracting surface having a convex shape downward facing away from the central axis. Lens for light emitting diode. In the light emitting diode lens for evenly dispersing the light emitted from the light emitting diode (LED),
An incident surface to which light emitted from the light emitting diode is incident, an exit surface to which light incident to the incident surface is emitted,
The exit surface,
Is provided in the central region including the central axis of the light emitting diode, a plurality of discontinuous refracting surface having a concave shape to be refracted in the direction away from the central axis emitted from the light emitting diode incident to the incident surface is provided First exit surface;
A second emission having a plurality of discontinuous refracting surfaces provided around the first emission surface and having a convex shape to refract light emitted from the light emitting diode to the incident surface in a direction away from the central axis; if; And
And a fourth exit surface having a plurality of discontinuous refraction surfaces having a convex shape on a side surface connecting the bottom surface and the top surface of the lens. The method of claim 1,
A groove for accommodating the light emitting diode is provided in the center of the bottom surface of the lens, and a central concave portion of the groove is provided with a concave upward portion to refract the light emitted from the light emitting diode in a direction away from the central axis. Light emitting diode lens. The method of claim 1,
The first exit surface is formed as a straight line inclined upwardly with respect to the center axis on a vertical cross section, and the second exit surface is a flat straight line connected to the first exit surface on a vertical cross section or a straight slope inclined downward. A light emitting diode lens, characterized in that made. The method of claim 1,
The first exit surface is formed of a flat straight line orthogonal to the central axis on the vertical cross section, the second exit surface is characterized in that the straight line inclined downward connected to the first exit surface on a vertical cross section Lens for light emitting diode. The method of claim 1,
The first exit surface is a straight line inclined downward with respect to the center axis on a vertical cross section, and the second exit surface is a flat straight line connected to the first exit surface on a vertical cross section or a straight slope inclined downward. A light emitting diode lens, characterized in that made. The method of claim 1,
The emission surface is a light emitting diode lens, characterized in that consisting of a straight straight line orthogonal to the central axis on the vertical cross-section or a straight line inclined downward based on the central axis. In a Back Light Unit (BLU) using a light emitting diode (LED) as a light source,
The backlight unit of claim 1, wherein the light emitting diode lens of any one of claims 1 to 9 is provided above the light emitting diode to evenly distribute the light emitted from the light emitting diode. A display device using a light emitting diode (LED) as a light source,
A display device according to any one of claims 1 to 9, wherein the lens for a light emitting diode is provided above the light emitting diode to evenly distribute the light emitted from the light emitting diode. In the light emitting diode cylinder lens having a cross-section uniform in the longitudinal direction is provided on the plurality of light emitting diodes (LEDs) arranged in one direction to evenly distribute the light emitted from the light emitting diodes,
A shape of a vertical cross section of the light emitting diode cylinder lens has a shape of a vertical cross section of the light emitting diode lens according to any one of claims 1 to 9.

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