TWM636080U - Light emitting device and backlight module - Google Patents

Abstract

A light emitting device and a backlight module are provided. The backlight module includes the light emitting device and a light guide plate, wherein the light guide plate is arranged on one side of the light emitting device. The light emitting device includes a substrate, a plurality of light sources, a reflector, a plurality of ribs and a plurality of glue filling portions. The light sources are arranged on the substrate and arranged in a matrix, wherein the matrix has a long side and a short side. The reflector arranged on the substrate has a plurality of first portions, and the light sources are arranged between the first portions, wherein the first portions extend in the direction parallel to the long side, and each of the first portions has a first end and a second end, the first end is connected to the substrate, and the second end is relatively far away from the substrate. The ribs are respectively connected with each of the first portions, at least one light source is arranged between adjacent ribs, and the ribs extend in a direction parallel to the short sides. The glue filling portions are arranged at the second ends, and a glue is filled in the glue filling portions and is bonded to the light guide plate.

Description

Light emitting device and backlight module

The present invention relates to a device and a module, and in particular to a light emitting device and a backlight module.

When sub-millimeter light-emitting diodes (Mini LEDs) are used in side-entry light sources, they are usually stamped by COB (Chip On Board), and then coated with protective glue or fluorescent glue to emit blue light or mix white light .

However, when the mini LED is combined with the light guide plate, the following conditions may occur: due to the assembly structure, there is an air gap between the mini LED and the light guide plate, resulting in light loss; in addition, the air gap between the mini LED and the light guide plate It is not uniform, the air gap in some places is small, and the air gap in some places is large, resulting in uneven light incident (Mura), which makes the light-emitting device have the problem of different light colors; and, because the light-emitting device is installed After being installed in the backlight module, there is no light blocking structure on the upper/lower side of the light source, which is prone to light leakage, resulting in light loss and Mura on the light incident side.

This "Background Technology" is only used to help understand the content of the present invention, so the content disclosed in the "Background Technology" paragraph may contain some conventional technologies that do not constitute the knowledge of those with ordinary skill in the technical field. The content disclosed in the "Background Technology" paragraph does not mean that the content or the problems to be solved by one or more embodiments of the present utility model have been known or recognized by those with ordinary knowledge in the technical field before the application of the utility model .

The novel creation provides a light-emitting device that improves light leakage at the light-incident side.

The novel creation provides a backlight module with improved luminous efficiency.

A light-emitting device created by the present invention includes a substrate, multiple light sources, reflectors, multiple ribs, and multiple glue-filling parts. The light sources are arranged on the substrate and arranged in a matrix, wherein the matrix has long sides and short sides. The reflector is arranged on the substrate and has a plurality of first parts, and the light source is arranged between the first parts, wherein the first parts extend along the direction parallel to the long sides, and each of the first parts has a first end and a second end, and the first part One end is connected to the substrate, and the second end is relatively far away from the substrate. The ribs are respectively connected with each of the first parts, there is at least one light source between adjacent ribs, and the ribs extend along the direction parallel to the short sides. The glue filling part is arranged at the second end, and the glue is suitable for filling in the glue filling part.

A backlight module created by the present invention includes the above-mentioned light-emitting device and a light guide plate, wherein the light guide plate is arranged on one side of the light-emitting device, and the light source emits light toward the light guide plate, and the glue is filled in the glue filling part and bonded to the light guide plate.

In one embodiment, the glue filling part is against the light guide plate.

In one embodiment, the glue filling portion has an inclined surface, the glue is disposed on the inclined surface, and the height of the side of the glue filling portion close to the light source is higher than the height of the side relatively away from the light source.

In one embodiment, the glue filling portion has a stepped structure, and the height of the side adjacent to the light source is higher than the height of the side relatively away from the light source.

In one embodiment, the glue filling part has a groove, the glue is disposed in the groove, the groove is disposed on a glue filling top surface of the glue filling part, and the width of the groove is smaller than the width of the glue filling top surface.

In one embodiment, the thickness of the first end is greater than the thickness of the second end.

In one embodiment, the rib is connected to the substrate, and the height of the rib is lower than that of the first portion.

In one embodiment, each of the light sources includes a light-emitting diode unit and a filling glue, the filling glue covers the light-emitting diode unit, and the height of the filling glue is higher than that of the ribs, and the height of the first part is higher than that of the ribs. The height of the padding.

In one embodiment, the reflector further includes a plurality of second parts, the second parts are respectively connected to each of the first parts, and the ribs and the light source are arranged between the second parts, and the second parts extend along the direction parallel to the short side .

In one embodiment, the filling glue in the light source is connected to each other.

In one embodiment, the height of the LED unit is lower than that of the ribs.

Based on the above, in the light-emitting device of the present invention, the use of the reflector can improve the problem of light leakage. Applying the light-emitting device to the backlight module can improve the problem of uneven air gap between the light-emitting device and the light guide plate, and further improve light efficiency.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with accompanying drawings.

The aforementioned and other technical contents, features and effects of the present utility model will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.

Fig. 1 is a schematic cross-sectional view of a backlight module created by the present invention, Fig. 2 is a schematic top view of the light-emitting device in Fig. 1, and Fig. 3 is a cross-sectional view of the A-A' section line of Fig. 2 . For clarity, the illustration of the structure of the glue filling part 25 is omitted in FIGS. 1 to 3 . Please refer to FIG. 1 , FIG. 2 and FIG. 3 at the same time. The backlight module 1 includes a light emitting device 2 and a light guide plate 3 . The backlight module further includes a gel G, which is suitable for being disposed between the light guide plate 3 and the light emitting device 2 .

The bottom surface of the light guide plate 3 (for example, the bottom surface is connected to a side surface on which the light emitting device 2 is disposed) may be provided with microstructures (as shown in FIG. 1 ) to improve optical efficiency. In addition, one side of the bottom surface of the light guide plate 3 may be provided with a reflective sheet (as shown in FIG. 1 ), and the reflective sheet is used to reflect light incident thereon.

Based on the above, the light emitting device 2 includes a substrate 21 , a plurality of light sources 22 , a reflector 23 , a plurality of ribs 24 and a plurality of glue filling portions 25 .

The substrate 21 is, for example, a printed circuit board or a flexible circuit board. The light source 22 is disposed on the substrate 21 , and the light source 22 emits light toward the light guide plate 3 . The light sources 22 are arranged in an m*n matrix (as shown in FIG. 2 ), wherein m and n are natural numbers, and m>n; and therefore, the matrix has a long side and a short side. In this embodiment, the light sources 22 are arranged in a matrix of 9*1, but it is not limited thereto. FIG. 4 is a schematic diagram of light sources 22 arranged in an m*2 matrix. It can be seen from FIG. 2 and FIG. 4 that the number of rows and columns of the matrix light source 22 is designed and selected according to actual requirements.

Please continue to refer to FIG. 1, FIG. 2 and FIG. 3 at the same time. The reflector 23 is arranged on the substrate 21. The reflector 23 has a plurality of first parts 231 arranged parallel to each other, and the light source 22 is arranged between two adjacent first parts 231. between. In this embodiment, the light sources 22 are arranged in a 9*1 matrix, so there are two first parts 231 , and as shown in FIG. 2 , one first part 231 is provided on the upper and lower sides of the matrix light source 22 .

The above-mentioned first part 231 extends along the direction parallel to the long side of the light source matrix, and each first part 231 has a first end 231a and a second end 231b, wherein the first end 231a is connected to the substrate 21, and the second end 231b is relatively far away from Substrate 21. Specifically, the second end 231b is the part of the first part 231 closest to the light guide plate 3 . In addition, the first portion 231 has an inner surface 231c, an outer surface 231d and a top surface 231e. 3, the inner surface 231c is the surface of the first part 231 adjacent to the light source 22, and the outer surface 231d is the surface of the first part 231 relatively away from the light source 22, and the inner surface 231c and the outer surface 231d are opposite surfaces, The top surface 231e is located at the second end 231b and connected between the inner surface 231c and the outer surface 231d.

The first portion 231 of the reflector 23 has a thickness, wherein the thickness of the first portion 231 refers to the distance between the inner surface 231c and the outer surface 231d. In this embodiment, the thickness T1 of the first end 231a of the first portion 231 is greater than the thickness T2 of the second end 231b, wherein the thickness of the first portion 231 is tapered from the first end 231a to the second end 231b. The structural design that the thickness T1 of the first end 231a connected to the substrate 21 is greater than the thickness T2 of the second end 231b relatively far away from the substrate 21 helps to enhance the structural strength of the reflector 23 and prolong the service life of the reflector 23 .

Please continue to refer to Figures 1 to 3 at the same time. Each of the aforementioned ribs 24 is connected to the base plate 21 and extends along a direction parallel to the short sides. In other words, the extending direction of each rib 24 is substantially perpendicular to the extending direction of the first portion 231 . Two ends of each rib 24 are respectively connected to two corresponding adjacent first portions 231 . In addition, at least one light source 22 is disposed between adjacent ribs 24 . It can be seen that the ribs 24 also provide the function of partitioning the plurality of light sources 22 , and thus the designer can easily perform local dimming of the light emitting device 2 through the partitioning. In this embodiment, the height of the rib 24 is lower than that of the first portion 231 .

The ribs 24 can also be made of the same material as the reflector 23 . In this way, the ribs 24 can reflect the light incident on it, so as to avoid the light loss caused by the long-distance transmission of the light emitted by the light source 22, and also prevent the light emitted by the light source 22 from being absorbed by the ribs 24 to reduce the light loss. usage rate.

In this embodiment, the glue filling part 25 is disposed on the second end 231b, wherein the glue G is suitable for being disposed on the glue filling part 25 and bonding the light guide plate 3, and the extension direction of the glue filling part 25 is, for example, parallel to the extension of the first part 231 direction, and the length of the glue filling portion 25 in the direction of extension is, for example, less than or equal to the length of the first portion 231 in the direction of extension. Specifically, the glue filling part 25 can be selectively abutted against the light guide plate 3, or the glue filling part 25 can be abutted against the light guide plate 3 through the glue G, which means that the glue filling part 25 is the part of the light emitting device 2 closest to the light guide plate 3 part.

Further, by disposing the glue filling part 25 on the second end 231b of the first part 231 of the reflector 23 of the light emitting device 2, for example, the glue filling part 25 is disposed on the top surface 231e of the first part 231 (as shown in FIGS. 6A to 6C ). shown), and the colloid G (at least part of the colloid G) is arranged on the glue filling part 25 and bonded to the light guide plate 3, so that the light emitting device 2 is attached to the light guide plate 3 with a uniform gap, and the backlight mold caused by the gap is improved. The problem of uneven light emission in group 1.

Based on the above, the reflector 23 further includes a plurality of second portions 232 extending parallel to the short sides of the light source matrix, and the second portions 232 are connected to the corresponding first portions 231 . Specifically, the extension direction of the second portion 232 is perpendicular to the extension direction of the first portion 231, and the second portion 232 is arranged on opposite sides of the first portion 231; that is, the sides of two adjacent first portions 231 are defined by the second Section 232 connects. In addition, the extension direction of the second portion 232 is parallel to the extension direction of the ribs 24 , and the ribs 24 and the light source 22 are disposed between the second portions 232 .

In addition, the reflectivity of the above-mentioned reflector 23 is greater than 90%, wherein the material of the reflector 23 can be selected polyphthalamide (Polyphthalamide, PPA), poly 1,4-cyclohexanedimethylene terephthalate ( Poly1,4-cyclohexylene dimethylene terephthalate, PCT) or epoxy molding compound (Epoxy Molding Compound, EMC), depending on actual needs. As shown in FIG. 1 and FIG. 2 , the first portion 231 of the reflector 23 provides the effect of blocking light from the upper and lower sides of the light source 22 . In addition, the second portion 232 of the reflector 23 is disposed outside the leftmost and rightmost light sources 22 to provide a light blocking effect, thus further preventing light leakage from the left and right sides of the light emitting device 2, thereby improving the backlight module 1. luminous efficiency.

Please continue to refer to FIG. 2 and FIG. 3 at the same time, each light source 22 includes a light-emitting diode unit 221 and a filling glue 222, wherein the light-emitting diode unit 221 is set (bonding) on the substrate 21 (for example, it is a COB method), The filling glue 222 covers the LED unit 221 . The filling glue 222 can be selected from protective glue, fluorescent glue or QD glue (Quantum Dot Glue) according to requirements.

Fig. 5 is a schematic diagram along the B-B' section line of Fig. 2 . Please refer to FIG. 2 , FIG. 3 and FIG. 5 at the same time. In this embodiment, the height of the filler 222 is higher than that of the rib 24 , and the height of the first portion 231 is higher than that of the filler 222 . In addition, the height of the light emitting diode unit 221 is lower than the height of the rib 24 , and in other embodiments, the height of the light emitting diode unit 221 may be higher than the height of the rib 24 .

In short, the order from high to low is the first part 231 , the filler 222 , the rib 24 and the light emitting diode unit 221 , wherein the height of the second part 232 can be substantially the same as that of the first part 231 . Incidentally, since the height of the filling glue 222 is higher than that of the ribs 24 , the filling glue 222 of the light sources 22 in different regions partitioned by the ribs 24 can be connected to each other.

Incidentally, the structure of the glue-filling part in the present invention is further designed to prevent the colloid G (shown in FIG. 1 ) from overflowing to the inner surface 231c of the first part 231 (shown in FIG. 3 ) during the glue-filling process. ), affecting the glow effect.

6A to 6C are schematic diagrams of different implementations of the glue filling portion.

Please refer to FIG. 2 and FIG. 6A, the glue filling part 25A has a slope, and the colloid G is, for example, disposed on the slope. L1 is higher than a height L2 on a side relatively far from the light source 22 . The height referred to here refers to along the Y direction in FIG. 6A (for example, the direction perpendicular to the long side and the short side of the light source matrix, or the direction from the first end 231a to the second end 231b), the glue filling part 25A The height L1 from the side adjacent to the light source 22 (or slope) to the top surface 231e and the height L2 from the side of the glue filling portion 25A (or slope) away from the light source 22 to the top surface 231e. It can be seen from FIG. 6A that the glue filling portion 25A slopes outward and downward from the inner surface 231c toward the outer surface 231d.

Please refer to FIG. 6B , the glue filling portion 25B can be a stepped structure, and the colloid G is, for example, disposed in a concave region of the stepped structure, and the height L1 of the side adjacent to the light source 22 (shown in FIG. 2 ) is higher than that relatively far away from the light source 22. (shown in Figure 2) the height L2 of one side.

Please refer to FIG. 6C, the glue filling part 25C may have a groove, the glue G is arranged in the groove, for example, the groove is arranged on the glue filling top surface of the glue filling part 25C, and the glue filling top surface is, for example, the glue filling part 25C away from the top surface 231e The glue-filled surface is, for example, parallel to the top surface 231e, and the width W1 of the groove is smaller than the width W2 of the glue-filled top surface. The width W1 of the groove and the width W2 of the glue-filled top surface 231e refer to the diameter of the groove and the glue-filled top surface along the direction parallel to the X direction in FIG. 6C (for example, the direction parallel to the short side of the light source matrix). The linear distance between the two ends of , and the groove is not provided on the side of the glue filling part 25C, that is, the groove is arranged in the middle area of the top surface of the glue filling.

Incidentally, although not shown in the drawings, the structural design of the second part 232 may be the same as or similar to that of the first part 231 . In short, the glue filling part 25 can also be provided on the second part 232 . In addition, the thickness of the second portion 232 may also gradually decrease from a direction relatively close to the substrate 21 to a direction relatively far away from the substrate 21 .

To sum up, in the light-emitting device of the present invention, the use of the reflector can improve the problem of light leakage. In addition, when this light-emitting device is applied to the backlight module, since the glue filling part is provided at the end of the reflector connected to the light guide plate, and after the glue is filled into the glue filling part, the glue is bonded to the light guide plate, which helps to make the Maintaining the same gap between the light source and the light guide plate can improve the problem of uneven air gap between the light emitting device and the light guide plate, and further improve light efficiency.

In addition, the arrangement of the ribs in the reflector can not only strengthen the structural strength of the reflector, but also partition the light source and reflect the light incident on it, so as to prevent light loss due to long-distance transmission of light.

But the above is only a preferred embodiment of the utility model, and should not limit the scope of the utility model implementation with this, that is, all simple equivalents made according to the utility model application scope and utility model description content Changes and modifications all still belong to the scope covered by the utility model patent. In addition, any embodiment of the utility model or the scope of the patent application does not need to achieve all the purposes or advantages or features disclosed in the utility model. In addition, the abstract part and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the utility model. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name elements (elements) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. upper or lower limit.

Although the present utility model has been disclosed above with the embodiments, it is not intended to limit the creation of the present utility model. Anyone with ordinary knowledge in the technical field may make some modifications and changes without departing from the spirit and scope of the utility model. Retouching, so the scope of protection of the present utility model should be defined by the scope of the appended patent application as the criterion.

1: Backlight module 2: Lighting device 3: Light guide plate 21: Substrate 22: light source 221: Light emitting diode unit 222: filling glue 23: reflector 231: Part 1 231a: first end 231b: second end 231c: inner surface 231d: External surface 231e: top surface 232: Part Two 24: Ribs 25A, 25B, 25C: glue filling part T1, T2: Thickness G: colloid L1, L2: Height Y: Direction W1, W2: Width

FIG. 1 is a schematic top view of a backlight module created by the present invention. FIG. 2 is a schematic diagram of the light emitting device in FIG. 1 . Fig. 3 is a cross-sectional view of the line A-A' of Fig. 2 . FIG. 4 is a schematic diagram of light sources arranged in an m*2 matrix. Fig. 5 is a schematic diagram along the B-B' section line of Fig. 2 . 6A to 6C are schematic diagrams of different implementations of the glue filling portion.

1: Backlight module

2: Lighting device

3: Light guide plate

21: Substrate

22: light source

221: Light emitting diode unit

222: filling glue

23: reflector

231: Part 1

25: Glue filling part

G: colloid

Claims (21)

A light emitting device, comprising: a substrate; a plurality of light sources arranged on the substrate and arranged in a matrix, the matrix has a long side and a short side; a reflector, arranged on the substrate, has a plurality of first A part, the light sources are arranged between the first parts, wherein the first parts extend along the direction parallel to the long side, and each of the first parts has a first end and a second end, the first part One end is connected to the substrate, and the second end is relatively far away from the substrate; a plurality of ribs, the ribs are respectively connected to each of the adjacent first parts, and the light sources are arranged between the adjacent ribs At least one of the ribs extends along the direction parallel to the short side; and a plurality of glue filling parts are arranged on a top surface of the first part, so that a glue is arranged on the glue filling parts, and the top surface is located at the second end. The light-emitting device according to claim 1, wherein the glue-filling part has a slope, the glue is arranged on the slope, and the height of the side of the glue-filling part adjacent to the light sources is higher than that of the side far away from the light sources. high. The light-emitting device according to claim 1, wherein the glue filling portion has a stepped structure, and the height of a side adjacent to the light sources is higher than that of a side relatively far away from the light sources. The light-emitting device according to claim 1, wherein the glue-filling part has a groove, the glue is arranged in the groove, the groove is arranged on a glue-filling top surface of the glue-filling part, and the width of the groove is less than the width of the top surface of the filler. The light emitting device as claimed in claim 1, wherein the thickness of the first end is greater than the thickness of the second end. The light emitting device as claimed in claim 1, wherein the ribs are connected to the substrate, and the height of the ribs is lower than the height of the first parts. The light-emitting device according to claim 1, wherein each of the light sources includes a light-emitting diode unit and a filling glue, the filling glue covers the light-emitting diode unit, and the height of the filling glue is higher than The height of the ribs and the height of the first parts are higher than the height of the filling glue. The light-emitting device according to claim 1, wherein the reflector further includes a plurality of second parts, and the second parts are respectively connected to each of the first parts, and the ribs and the light sources are arranged on the Between the second parts, the second parts extend along a direction parallel to the short side. The light emitting device as claimed in item 7, wherein the filling glues in the light sources are connected to each other. The light emitting device as claimed in claim 7, wherein the height of the light emitting diode units is lower than the height of the ribs. A backlight module, comprising: a light emitting device, comprising: a substrate; A plurality of light sources are arranged on the substrate and arranged in a matrix, and the matrix has a long side and a short side; a reflector is arranged on the substrate and has a plurality of first parts, and the light sources are arranged on the between the first parts, wherein the first parts extend along a direction parallel to the long side, and each of the first parts has a first end and a second end, the first end is connected to the substrate, and the first part is connected to the substrate, The second end is relatively far away from the substrate; a plurality of ribs, the ribs are respectively connected to each of the adjacent first parts, there is at least one of the light sources between the adjacent ribs, and the ribs are along the extending parallel to the direction of the short side; and a plurality of glue filling parts arranged on a top surface of the first part; and a light guide plate arranged on one side of the light emitting device, the light sources emit light toward the light guide plate, and a The colloid is arranged on the glue filling parts and bonded to the light guide plate. The backlight module as claimed in claim 11, wherein the glue filling portion abuts against the light guide plate. The backlight module according to claim 11, wherein the glue filling part has an inclined surface, the glue is arranged on the inclined surface, and the height of the side of the glue filling part adjacent to the light sources is higher than the side relatively far away from the light sources the height of. The backlight module according to claim 11, wherein the glue filling portion has a stepped structure, and the height of the side adjacent to the light sources is higher than the height of the side relatively far away from the light sources. The backlight module according to claim 11, wherein the glue filling part has a groove, the glue is arranged in the groove, the groove is arranged on a glue filling top surface of the glue filling part, and the groove The width is smaller than the width of the top surface of the filler. The backlight module as claimed in claim 11, wherein the thickness of the first end is greater than the thickness of the second end. The backlight module as claimed in claim 11, wherein the ribs are connected to the substrate, and the height of the ribs is lower than the height of the first parts. The backlight module as claimed in item 11, wherein each of the light sources includes a light-emitting diode unit and a filling glue, the filling glue covers the light-emitting diode unit, and the height of the filling glue is high As for the height of the ribs, the height of the first portions is higher than that of the filler. The backlight module as claimed in claim 18, wherein the fillers in the light sources are connected to each other. The backlight module as claimed in claim 18, wherein the height of the light emitting diode units is lower than the height of the ribs. The backlight module as claimed in item 11, wherein the reflector further includes a plurality of second parts, the second parts are respectively connected to each of the first parts, and the ribs and the light sources are arranged on the Between the second portions, the second portions extend along a direction parallel to the short side.

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