Patent ID: 12259110

DETAILED DESCRIPTION

It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different FIG.s to indicate corresponding or analogous components. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.

The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like.

Referring toFIG.1, an optical packaging structure100is provided according to an embodiment of the present disclosure. The optical packaging structure100includes at least one light-emitting chip2, a packaging layer3, a fluorescent layer4, a lens structure5, and a reflecting layer7. The light-emitting chip2includes a light-emitting surface21, a connecting surface22opposite to the light-emitting surface21, and a first side surface23connected to the light-emitting surface21and the connecting surface22. The light-emitting chip2emits light from the light-emitting surface21. The packaging layer3covers the light-emitting surface21and the first side surface23of the light-emitting chip2. The packaging layer3includes a first top surface31facing the light-emitting surface21and a second side surface32facing the first side surface23. The connecting surface22is exposed from the packaging layer3to facilitate electrical connection between the connecting surface22and a circuit board (not shown). The fluorescent layer4is disposed on the first top surface31and the second side surface32of the packaging layer3. The fluorescent layer4includes a second top surface41spaced from and facing the first top surface31. The fluorescent layer4covers the packaging layer3and the light-emitting chip2. The lens structure5is disposed on the second top surface41of the fluorescent layer4and above the light-emitting surface21. The lens structure5includes a third top surface52spaced from and facing the second surface, the third top surface52being recessed towards the light-emitting chip2to form a curved surface6. The reflecting layer7is disposed on the curved surface6. The lens structure5has a certain refractive index. The lens structure5and the reflecting layer7can cooperatively reflect the light from the light-emitting chip2and change a travelling direction of the light, while the curved surface6can effectively increase a light-emitting angle to improve an optical effect of the optical packaging structure100. As such, the optical packaging structure100can emit light to the ambient environment from each sidewall of the optical packaging structure100. Furthermore, the lens structure5and the reflecting layer7are located on the top second surface41of the fluorescent layer4, which is beneficial for reducing a size of the optical packaging structure100compared to a related art that covering an entire light-emitting chip with a lens.

The light-emitting chip2is a LED chip. The light-emitting chip2may be, but is not limited to, a flip-chip structure. The light-emitting chip2with the flip-chip structure can be soldered on the circuit board of a backlight module through eutectic soldering technology. Thus, the installation of the optical packaging structure100in the backlight module is easily and simply. The production costs can be reduced. Furthermore, the size of the optical packaging structure100can be reduced, which can provide greater power with a same packaging size.

In a direction perpendicular to the light emitting surface21, an orthogonal projection of the lens structure5on the light emitting surface21covers the light emitting surface21. Thus, the light emitted by the light-emitting chip2from the light emitting surface21can almost be completely transmitted into the lens structure5. Thus, the light emitted by the light-emitting chip2in a vertical direction (defined as “a”) is fully reflected to reduce a light intensity in the vertical direction. Furthermore, the light emitted in the vertical direction is reflected to a side of the optical packaging structure100to enlarge the light emission angle.

In an embodiment, a projection of the curved surface6along the direction perpendicular to the light emitting surface21covers the light emitting surface21. Thus, the reflecting layer7can entirely cover the curved surface6.

In an embodiment, the lens structure5further includes a bottom surface51opposite to the third top surface52. The first surface51is close to the light-emitting chip2. The first surface51is a plane, that is, the second top surface41of the fluorescent layer4in contact with the lens structure5is a plane. The third top surface52is recessed towards the bottom surface51to form the curved surface6. The bottom surface51of the lens structure5is a plane. In other words, the bottom surface51is a place with no curvatures. The bottom surface51can fully refract the light emitted from the light-emitting chip2and conduct the light to the lens structure5with a curved surface6. Thus, the light in the vertical direction of the light-emitting chip2can be reflected to the sidewalls of the optical packaging structure100sufficiently, thereby reducing the light intensity in the vertical direction.

In an embodiment, the optical packaging structure100is substantially a cubic structure. The packaging layer3and the fluorescent layer4are also cubic structures. The lens structure5is located on the top of the fluorescent layer4. A third side surface42of the fluorescent layer4can be a vertical surface or a curved surface with a small curvature, which is beneficial for further reducing the size of the optical packaging structure100and improving a packaging density of the optical packaging structure100in the backlight module.

Referring toFIG.1, the curved surface6is located on the entire third top surface52of the lens structure5, so that a projection of the curved surface6along the direction perpendicular to the light emitting surface21covers the light emitting surface21. The reflecting layer7entirely covers the curved surface6. Thus, the light refracted from the third top surface52in the lens structure5can be reflected by the reflecting layer7, and due to the curved surface6, and the light emission angle can be significantly increased to enlarge a light emission range and improve light efficiency.

In an embodiment, the curved surface6is a concave surface that is concave towards the third top surface52, which is conducive to enlarge the light emission angle of the light reflected by the reflecting layer7.

In an embodiment, a curvature of the curved surface6gradually decreases from a periphery of the curved surface6to a middle of the curved surface6, which is beneficial for evenly reflecting the light in the middle and periphery of the light-emitting chip2at a large angle.

In an embodiment, the curved surface6may be, but not limited to, a spherical surface, a quasi-spherical surface, an ellipsoidal surface, a quasi-ellipsoidal surface, or an irregular concave surface.

In another embodiment, referring toFIG.2, the curved surface6may be a wavy surface and include multiple concave surfaces. Thus, the curved surface6and the reflecting layer7can cooperatively reflect the light in the vertical direction in multiple directions, which not only increases the angle of reflected light, but also improves the uniformity of reflected light.

In an embodiment, a distance (defined as “h”) between a lowest point of the curved surface6is spaced from and the bottom surface51, the distance “h” is greater than zero. Thus, the curved surface6does not directly reflect the light emitted by the fluorescent layer4. That is, all light emitted from the fluorescent layer4first enters the lens structure5and is subjected to a certain degree of refraction, and then the light is reflected by the reflecting layer7on the curved surface6. Thus, the light in the vertical direction can travel to the sidewalls of optical packaging structure100, thereby preventing a portion of the light from travelling along its original path, which is beneficial for further enlarging the angle of reflected light.

In an embodiment, the projection of the lens structure5along the direction perpendicular to the light emitting surface21covers the light emitting surface21, which can fully refract the light emitted from the light emitting surface21. Thus, the light efficiency of the optical packaging structure100is further improved.

In an embodiment, a plurality of light-emitting chips2are arranged in the packaging layer3. The projection of the curved surface6along the direction perpendicular to the light-emitting surface21covers the light-emitting surface21of each of the light-emitting chips2. By encapsulating the plurality of light-emitting chips2together in the packaging layer3, the density of the light-emitting chips2can be increased, the optical effect can be improved, and the number of optical packaging structures100in the backlight module can be reduced.

Referring toFIG.3, an optical packaging structure200is provided according to another embodiment of the present disclosure. The structure of the optical packaging structure200is substantially same as that of the optical packaging structure100, except that the optical packaging structure200further includes a substrate1. The light-emitting chip2is flip-chip connected to the substrate1. The connecting surface22of the light-emitting chip2is electrically connected to pads of the substrate1. The substrate1is further in contact with the packaging layer3and the fluorescent layer4, thereby sealing the light-emitting chip2.

The light-emitting chip2is a flip-chip structure. The flip-chip light-emitting chip2can be soldered on the substrate1through eutectic soldering technology. Compared to CSP packaging structure, the optical packaging structure200with the substrate1is a NCSP structure, which facilitates the packaging of the light-emitting chip2and the miniaturization of the optical packaging structure200.

With the above configuration, in the optical packaging structure100(200), the lens structure5with the curved surface6is disposed on the top of the fluorescent layer4, and the reflecting layer7is disposed on the curved surface6. The light is refracted by the lens structure5and reflected by the reflecting layer7on the curved surface6, which can enlarge the light emission angle to direct the light in the vertical direction to the sidewalls of the optical packaging structure100(200). Thus, the optical effect of the optical packaging structure100is improved. Furthermore, the lens structure5is only disposed on the top of the fluorescent layer4, thereby reducing the volume of the optical packaging structure100(200).

Referring toFIG.4, a backlight module1000is also provided according to an embodiment of the present disclosure. The backlight module1000includes a circuit board300and at least one optical packaging structure100(200) disposed on the circuit board300. The connecting surface22of the optical packaging structure100is electrically connected to the circuit board300. The optical packaging structure200is electrically connected to the circuit board300through the substrate1.

The optical packaging structure100(200) is beneficial to improving the light-emitting effect of the backlight module1000, while also reducing the number of optical packaging structures100(200) on the backlight module1000.

Even though information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only. Changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present exemplary embodiments, to the full extent indicated by the plain meaning of the terms in which the appended claims are expressed.