TWI390767B - Led package and backlight module having the same - Google Patents

Description

Light-emitting diode package and backlight module including light-emitting diode package

The invention relates to a light-emitting diode package and a backlight module, in particular to a light-emitting diode package and a backlight module with a good light-expanding angle.

Light-Emitting Diode (LED) has the advantages of small size, low power consumption, fast response, long service life, etc., and has gradually replaced traditional light sources in various application fields. However, because the LED is a point source, the angle of illumination after being packaged is relatively concentrated, thus limiting the application range of the LED, and thus improving the illumination angle of the LED has been one of the major research and development directions in the industry.

1 is a schematic view of a conventional light emitting diode package. As shown in FIG. 1 , the LED 12 is disposed on the susceptor 11 and an electrode (not shown) is disposed on the susceptor 11 , such that the LED 12 can be a lead or a conductive bump (not shown) and the pedestal 11 The electrodes are electrically connected, and a package 13 such as a transparent resin encloses the LEDs 12, leads or conductive bumps to protect the LEDs 12. When the light emitted from the LED 12 reaches the light-emitting surface 131 where the package 13 and the air meet, a refraction phenomenon occurs, so that the LED package 1 has a large illumination angle.

When comparing the light-expanding ability of different light-emitting diode packages, the difference of the "semi-strong angle" of each package can be compared under the same environmental conditions. The semi-strong angle refers to the position at which the 50% reference light intensity is measured at the same distance based on the light intensity measured by the normal direction of the LED 12 on the susceptor 11 and extends to the LED 12 connection. The angle between the two normals. As shown in the conventional design of FIG. 1, the light-emitting surface 131 of the LED package 1 has a single curved surface design, and a half-height angle of only about 70 degrees can be obtained, so that the light-expanding capability still has a great improvement space.

An object of the present invention is to provide a light emitting diode package and a backlight module including the same, which has a good light-expanding effect and can effectively reduce the contrast between the light and dark bands of the backlight module.

According to one embodiment of the present invention, a light emitting diode package includes a pedestal, a light emitting diode, and a package. At least one electrode is disposed on one surface of the base, and the light emitting diode is disposed on the surface and electrically connected to the electrode. The package body has an arc-shaped surface and a light-expanding surface protruding from the surface of the base, and the light-expanding surface is provided with at least one first curved groove.

According to another embodiment of the present invention, a backlight module includes a light guide plate and a light emitting diode package. The light guide plate has a light incident surface, and the light emitting diode package is disposed on the light incident surface side. The LED package includes a base, a light emitting diode, and a package. At least one electrode is disposed on one surface of the base, and the light emitting diode is disposed on the surface and electrically connected to the electrode. The package body has an arc-shaped surface and a light-expanding surface protruding from the surface of the base, and the light-expanding surface is provided with at least one first curved groove.

According to the design of each embodiment of the present invention, at least one arc-shaped groove is disposed on the light-enhancing surface, so that the light emitted by the light-emitting diode can have a larger light-emitting angle and can enhance the light energy emitted from the edge at a large angle. And can evenize the overall light intensity and effectively reduce the contrast of the bright and dark bands of the backlight module.

Hereinafter, a light-emitting diode package and a backlight module according to the present invention will be described with reference to the related drawings, wherein the same elements will be described with the same reference numerals.

Referring to FIG. 2 a , the LED package 2 includes a pedestal 21 , a light emitting diode 22 , and a package 23 . At least one electrode (not shown) is disposed on one surface 211 of the susceptor 21, and the illuminating diodes 22 are disposed on the same pedestal surface 211. The electrodes on the pedestal 21 are electrically connected to the LEDs 22 in a suitable manner to provide the power required for the illuminating diodes 22 to illuminate. The light-emitting diode 22 can be electrically connected to the electrode on the pedestal 21 by means of a lead wire, but is not limited thereto. For example, the light-emitting diode 22 can be disposed on the susceptor 21 by using a flip chip, and the conductive bump and the pedestal 21 can be used. The upper electrode is electrically connected. The package body 23 encloses the light-emitting diode 22 and the surface 211 on which it is disposed, thereby protecting the light-emitting diode 22 and the electrodes on the surface 211 of the susceptor 21. In one embodiment, the light emitting diode 22 can be a red, green, blue or white light emitting diode.

The package body 23 has a light-expanding surface 231 that is substantially curved and protrudes from the base surface 211. It should be noted that the curved light-expanding surface 231 is not limited to a partial circular surface or an elliptical surface, and any curved surface that contributes to light diffusion effects is included in the present invention, such as a paraboloid or the like. Furthermore, the light-expanding surface 231 is provided with an arcuate recess 24 recessed toward the surface 211 of the base, so that the light-increasing surface 231 has a concave curved surface 241.

In one embodiment, the arcuate recess 24 is disposed opposite the light emitting diode 22. In one embodiment, the angle θ between the end of either side of the curved groove 24 extending to the light emitting diode 22 and the normal N of the pedestal surface 211 is greater than or equal to 5 degrees and less than or Equal to 45 degrees to maintain the arcuate recess 24 in the proper opening size. Further, a preferred range of the ratio of the depth D1 of the curved groove 24 to the thickness T of the package is 0.05 ≦ (D1/T) ≦ 0.7. Moreover, although the angle θ of FIG. 2a is illustrated as extending from one end of the curved groove 24 to the center point of the light-emitting diode 22, the definition of the included angle θ may also cover the end point extension of one of the first curved grooves 24. The line connecting to any of the light-emitting regions of the light-emitting diode 22 is at an angle to the surface 211 of the base.

Referring to FIG. 2b, the light diffusion effect of the embodiment shown in FIG. 2a is illustrated by taking the light emitted from the center point of the light-emitting diode 22 as an example. As shown in FIG. 2b, the light ray L1 is emitted along the normal direction of the substrate 21, and the path is not deflected. When the light ray L2 passes through the curved surface 241, the path is deviated from the normal direction of the curved surface 241 due to the refraction effect. Compared with the conventional light-expanding surface 131 design, the concave curved surface 241 of the present invention can make the light deflection angle of the light beam L2 larger than the light deflection angle of the light beam L2'; on the other hand, the concave concave surface 241 portion The area can cause total reflection of the incident light. For example, the light L3 is totally reflected by the concave curved surface 241, and then refracted by the light-expanding surface 231, so that the light L3 leaves the light-expanding surface 231 at a larger angle than before. Large angle of light. Therefore, the design of the concave curved surface 241 is formed on the light-enlarged surface 231 in this embodiment, and the light-expanding effect can be greatly improved.

Referring to FIG. 3, in a light-emitting diode package 2' according to another embodiment of the present invention, the light-expanding surface 231 is provided with a first curved groove 24 at a position opposite to the light-emitting diode 22, and two The side is further provided with a second arcuate groove 25, and the second arcuate groove 25 and the first arcuate groove 24 are preferably spaced apart from each other. In an embodiment, the depth D2 of the second curved groove 25 is less than or equal to the depth D1 of the first curved groove 24.

Referring to FIG. 4, a light intensity analysis diagram of the conventional light-emitting diode package 1 shown in FIG. 1 and the light-emitting diode package 2 of the embodiment of the present invention shown in FIG. 2a on a 0 degree plane is shown. The light-emitting effect of the conventional light-emitting diode package 1 (shown by a broken line in the figure) and the light-emitting diode package 2 of the present invention (shown by the solid line in the figure) is known. The half-boom angle of the diode package 1 is about 70 degrees, and the half-brightness angle of the light-emitting diode package 2 of the present invention is about 83 degrees. Therefore, the light-emitting diode package 2 of the present invention has better The light-expanding effect enhances the edge light energy. In addition, as shown in FIG. 4, the LED package 2 of the present invention can average the light intensity within ±40 degrees, so that when the light guide plate is applied to a backlight module, the contrast of the light and dark bands can be effectively reduced.

FIG. 5 is a schematic diagram of a backlight module 5 according to an embodiment of the present invention. The backlight module 5 includes a light guide plate 4 and at least one light emitting diode package 2, and FIG. 5b shows the light emitting diode package of FIG. 5a. A perspective view of the outer shape of the package 23 of 2. The light guide plate 4 has a light incident surface 41, and the light emitting diode package 2 is disposed on the opposite side of the light incident surface 41. In the present embodiment, the package body 23 for the backlight module 5 is a cylinder, so that the thickness of the light guide plate 4 can be matched and the entire LED package 2 can be thinned and curved. 24 is formed on the side of the cylinder. The light incident surface 41 can be a flat surface or a concave curved surface as shown in Fig. 5a. In addition, the light incident surface 41 may be provided with a plurality of light diffusing structures 42. As shown in the embodiment of FIG. 5, the light-expanding structures 42 may be arcs of the same size, the same shape, and are continuously arranged and protruded, but are not limited thereto. Referring to FIG. 6a, the shape of each of the light-expanding structures 42' may be one of a circular arc shape, an elliptical arc shape, a triangular shape, a polygonal shape, or a combination of at least two or more. Furthermore, each of the light-enhancing structures may have the same size (shown in Figure 5a) or have different sizes, for example, in a large one-and-a-half order (shown in Figure 6a). In the embodiment shown in Fig. 6a, the ratio of the width W1 of the light-emitting structure 42' to its height H is greater than 2 or less than 2, but not equal to 2. In addition, referring to FIG. 6b, the light-expanding structure 42" may also be a concave structure concave toward the center of the light guide plate 4, and the ratio of the width W2 to the depth D3 is also greater than 2 or less than 2, but not equal to 2.

According to the design of each of the foregoing embodiments, at least one arc-shaped groove is disposed on the light-enhancing surface, so that the light emitted by the light-emitting diode can have a larger light-emitting angle and can increase the light energy emitted from the edge at a large angle. And can evenize the overall light intensity and effectively reduce the contrast between light and dark.

The above is intended to be illustrative only and not limiting. Equivalent modifications may be made to the embodiments of the invention described above without departing from the spirit and scope of the invention. Therefore, any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1. . . LED package

11. . . Pedestal

12. . . Light-emitting diode

13. . . Package

131. . . Dimming surface

2, 2’. . . LED package

twenty one. . . Pedestal

211. . . surface

twenty two. . . Light-emitting diode

twenty three. . . Package

231. . . Dimming surface

twenty four. . . First curved groove

241. . . Surface

25. . . Second curved groove

4. . . Light guide

41. . . Glossy surface

42, 42', 42"...light-emitting structure

5. . . Backlight module

D1. . . First curved groove depth

D2. . . Second curved groove depth

D3. . . Dimming structure depth

H. . . Light-emitting structure height

L1, L2, L2', L3. . . Ray path

N. . . Normal

T. . . Package thickness

W1, W2. . . Dimming structure width

1 is a schematic view of a conventional light emitting diode package.

2a is a light emitting diode package according to a preferred embodiment of the present invention.

Figure 2b is a schematic illustration of the optical path of the embodiment of Figure 2a.

3 is a light emitting diode package according to another preferred embodiment of the present invention.

4 is a light intensity analysis diagram of the light emitting diode package of FIG. 1 and the light emitting diode package of FIG. 2a at a 0 degree plane.

FIG. 5a is a schematic diagram of a backlight module according to a preferred embodiment of the present invention.

FIG. 5b is a perspective view showing the outline of a package of the LED package of FIG. 5a.

6a and 6b are schematic views showing a design example of a light-expanding structure formed on a light guide plate of the present invention.

2. . . LED package

twenty one. . . Pedestal

211. . . surface

twenty two. . . Light-emitting diode

twenty three. . . Package

231. . . Dimming surface

twenty four. . . Curved groove

241. . . Curved surface

D1. . . First curved groove depth

N. . . Normal

T. . . Package thickness

Claims (21)

A light-emitting diode package comprising: a pedestal having at least one electrode on a surface thereof; a light-emitting diode disposed on the surface and electrically connected to the electrode; and a package Encapsulating the light emitting diode, the package has a curved surface and a light-emitting surface protruding from the surface of the base, and the light-increasing surface is provided with at least a first curved groove and at least a second arcuate groove formed on one side of the first arcuate groove, and the depth of the second arcuate groove is less than or equal to the depth of the first arcuate groove . The light-emitting diode package of claim 1, wherein an end point of either side of the first curved groove extends to a line connecting the light-emitting diode and the surface of the base The angle between the two lines is greater than or equal to 5 degrees and less than or equal to 45 degrees. The light emitting diode package of claim 1, wherein a ratio of a depth of the first curved groove to a thickness of the package is greater than or equal to 0.05 and less than or equal to 0.7. The illuminating diode package of claim 1, wherein the illuminating diode is a red, green, blue or white light emitting diode. The illuminating diode package of claim 1, wherein the first arcuate groove is formed at a rough position of the illuminating diode. The light emitting diode package of claim 1, wherein the second curved groove has a spacing from the first curved groove. The light-emitting diode package of claim 1, wherein the package is a cylinder, and the first curved groove is formed on one side of the cylinder. A backlight module includes: a light guide plate having a light incident surface; and a light-emitting diode package is disposed on the light-receiving side, the light-emitting diode package includes: a base, one surface of the base is provided with at least one electrode; and a light-emitting diode is disposed And the package is electrically connected to the electrode; and a package covering the light emitting diode, the package having a curved surface and a light-emitting surface protruding from the surface of the base, and The light-increasing surface is provided with at least one first curved groove and at least one second curved groove, the second curved groove is formed on one side of the first curved groove, and the second curved shape The depth of the groove is less than or equal to the depth of the first curved groove. The backlight module of claim 8, wherein an end point of either side of the first curved groove extends to a line connecting the light emitting diode and a normal to the surface of the base The included angle ranges from greater than or equal to 5 degrees and less than or equal to 45 degrees. The backlight module of claim 8, wherein a ratio of a depth of the first curved groove to a thickness of the package is greater than or equal to 0.05 and less than or equal to 0.7. The backlight module of claim 8, wherein the light emitting diode is a red, green, blue or white light emitting diode. The backlight module of claim 8, wherein the first arcuate groove is formed at a rough position of the light emitting diode. The backlight module of claim 8, wherein the second curved groove has a spacing from the first curved groove. The backlight module of claim 8, wherein the light incident surface is a plane. The backlight module of claim 8, wherein the light incident surface is a curved surface. The backlight module of claim 8, wherein the light incident surface is provided with a plurality of light-expanding structures. The backlight module of claim 16, wherein the shape of the light-expanding structure It is one of a circular arc shape, an elliptical arc shape, a triangle shape, a polygon shape, or a combination of at least two. The backlight module of claim 16, wherein the light-expanding structures protrude from the light-incident surface and the ratio of the width to the height is not equal to two. The backlight module of claim 16, wherein the light-expanding structures are recessed structures that are concave toward the center of the light guide plate and have a ratio of width to depth that is not equal to two. The backlight module of claim 16, wherein the light-emitting structures have the same size. The backlight module of claim 8, wherein the package is a cylinder, and the first curved groove is formed on one side of the cylinder.