TW201348817A - Light emitting module - Google Patents

Abstract

A light emitting module includes at least one light emitting diode (LED) and a light guiding structure. The LED emits light. The light guiding structure is disposed opposite to the LED and includes an optical coupling element, a light guiding film and a transparent connecting element. At least part of light from the light emitting diode emits into the optical coupling element. The light guiding film is disposed opposite to the optical coupling element. The light guiding structure is disposed on the boundary between the optical coupling element and the light guiding film. Light emits into the light optical coupling element, at least part of it is through the transparent connected element to enter the light guiding film.

Description

Light module

The invention relates to a light-emitting module, in particular to a light-emitting module which can be thinned.

The light-emitting diode is a light-emitting element made of a semiconductor material, and has the advantages of low power consumption, long component life, fast reaction speed, and the like, and the small size is easy to be made into a very small or array type component. As technology continues to advance, its range of applications has expanded from indicator lights and backlights to lighting.

Please refer to FIG. 1 , which is a partial cross-sectional view of a light emitting module of a conventional display device. The light-emitting module 1 is a light-emitting backlight module, which mainly includes at least one light-emitting diode 11, a light guide plate 12 and a circuit board 13. The light-emitting diode 11 has a light-emitting diode die 111. The light-emitting diode 11 and a portion of the light guide plate 12 are disposed on the circuit board 13. The light guide plate 12 is disposed adjacent to the light-emitting surface 112 of the light-emitting diode 11. The light emitted by the LED 11 enters the light guide plate 12, and then guides the light through the light guide plate 12, thereby providing uniform brightness and light to the panel of the display device.

As the display device is increasingly thinner, the thickness of the light-emitting module 1 also needs to be reduced, and the thickness of the light guide plate 12 used is also continuously reduced. However, the light guide plate 12 which is currently produced by the injection process has a thickness limit of about 0.4 to 0.5 mm and is exposed to the components of the light-emitting diode 11 . In the package structure, the edge-type light-emitting diode 11 may have a lead frame height greater than the thickness of the light guide plate 12. Therefore, in the prior art, the thickness of the light guide plate 12 can no longer be reduced, and the thickness of the display device is tested.

Therefore, how to provide a light-emitting module can reduce the thickness of the light-guiding structure, so that the display device is thinner, and the amount of light emitted by the light-emitting diode into the light-guiding structure can be increased to ensure the light-emitting module. The quality of light has become an important issue at present.

In view of the above problems, an object of the present invention is to provide a light-emitting module, which can reduce the thickness of the light-guiding structure and increase the amount of light that the light emitted by the light-emitting diode enters the light-guiding structure.

To achieve the above objective, a light emitting module according to the present invention comprises at least one light emitting diode and a light guiding structure. The light emitting diode emits a light. The light guiding structure is disposed opposite to the light emitting diode, and the light guiding structure comprises an optical coupling member, a light guiding film and a light transmitting connecting member. At least a portion of the light is incident on the optical coupling by the light emitting diode. The light guiding film is disposed corresponding to the optical coupling. The light-transmitting connecting member is disposed at a boundary of one of the optical coupling member and the light guiding film. The light incident on the light coupling member enters the light guiding film at least partially via the light transmitting connecting member.

In one embodiment, the light transmissive link is a gel.

In an embodiment, the light-transmissive link fills a gap between the optical coupling member and the light-guiding film.

In one embodiment, the light-transmissive link is a step that smoothes the intersection of the optical coupling and the light-guiding film.

In one embodiment, the thickness of the light guiding film is less than the height of one of the light emitting surfaces of the light emitting diode.

In one embodiment, a side of the light guiding structure adjacent to the light emitting diode has a first height, and a side away from the side of the light emitting diode has a second height, and the first height is greater than the second height. Further, the first height is greater than or equal to the height of one of the light-emitting surfaces of the light-emitting diode.

In an embodiment, the first height ranges from 0.4 mm to 1.0 mm. The second height ranges from 0.05 mm to 0.35 mm.

In one embodiment, the optical coupling member is a light guide plate and has an enlarged portion on a side adjacent to the light emitting diode.

In an embodiment, the optical coupling is a portion of a wedge shaped light guide.

In an embodiment, the light guiding structure further comprises a positioning piece, which is connected to the optical coupling component and the light guiding film. Wherein, the positioning piece is a reflection piece.

In one embodiment, the optical coupling member is a lens disposed on a side of the light guiding film adjacent to the light emitting diode.

In one embodiment, the optical coupling member has a reflecting surface and a light coupling surface, and the optical coupling member is coupled to the light guiding film by the light coupling surface, and at least part of the light is incident on the light guiding surface and the light coupling surface. Diaphragm. There is an angle between the reflecting surface and the light coupling surface, and the angle is less than or equal to 45 degrees.

In an embodiment, the optical coupling member has a reflecting surface, and the light is incident on the light guiding film via the reflecting surface.

In an embodiment, the optical coupling member further has an auxiliary molding member for assisting The molded part has a receiving portion, and the optical coupling member is accommodated in the receiving portion.

In one embodiment, when the light emitting diodes are plural, the light emitting diode systems are disposed on one side of the light guiding structure.

In an embodiment, the light emitting module further comprises a circuit board connected to the light emitting diode and the light guiding structure.

As described above, the light-emitting diode system of the light-emitting module of the present invention emits light and enters the light-guiding structure, wherein at least part of the light of the light-coupling member incident on the light-guiding structure is incident on the light-guiding film via the light-transmitting connecting member. . Since the light-transmitting connecting member connects the optical coupling member and the light guiding film, the light coupling member can preferably illuminate the light of the light-emitting diode into the light guiding film by the light-transmitting connecting member. Further, the light guiding film of the light guiding structure of the present invention is thinner than the conventional light guiding plate, and when applied to a display device or other light emitting device, the overall thickness can be made thinner.

Hereinafter, a light-emitting module according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals. It is to be understood that the structure, the proportions, the size, and the like of the present invention are intended to be used in conjunction with the disclosure of the specification, and are not intended to limit the invention. The conditions are limited, so it is not technically meaningful. Any modification of the structure, change of the proportional relationship or adjustment of the size should remain in this book without affecting the effects and the objectives that can be achieved by the present invention. The technical content disclosed in the invention can be covered.

The light emitting module includes at least one light emitting diode and a light guiding structure. The light emitting diode emits a light. The light-emitting module is applied, for example, to a display device to provide a light source to a panel; or the light-emitting module can be used as a light source of the illumination device or a light source of other electronic devices. The light guiding structure is disposed opposite to the light emitting diode, wherein the light guiding structure comprises an optical coupling member, a light guiding film and a light transmitting connecting member. At least a portion of the light is incident on the optical coupling by the light emitting diode. The light guiding film is disposed corresponding to the optical coupling. The light-transmitting connecting member is disposed at a boundary of one of the optical coupling member and the light guiding film. It should be noted that the light incident on the light coupling member is incident on the light guiding film at least partially via the light transmitting connecting member. The present invention is specifically described below in the plural embodiments and variations thereof.

First embodiment

2A is a cross-sectional view of a light emitting module according to a first embodiment of the present invention, and FIG. 2B is a schematic view of the light emitting module of FIG. 2A. The light emitting module 2 includes at least one light emitting diode 3 and a light guiding structure 4 . The light-emitting module 2 of the present invention is applied to, for example, a display device, and the light-emitting module 2 is a one-side light-type backlight module to provide a uniform light source to a display panel.

The light-emitting module 2 of the present embodiment has a plurality of light-emitting diodes 3 arranged in a side of one side of the light-guiding structure 4 (as shown in FIG. 2B). The number of the LEDs 3 is not limited to the present invention, and the arrangement may be one-dimensional or two-dimensional. In FIG. 2B, the LEDs are exemplified by a one-dimensional arrangement. The light-emitting diode 3 has a light-emitting diode die 31, and the light-emitting diode 3 is a side-view surface mount component. Of course, the LED 3 can also be Therefore, a die is disposed on a circuit board; or, the LED 3 is more preferably an organic light emitting diode (OLED).

The light guiding structure 4 is disposed opposite to the light emitting diode 3, and more specifically, the light guiding structure 4 is disposed on one side of the light emitting surface 32 of the light emitting diode 3 so that the light emitted by the light emitting diode 3 is emitted. The light is injected into the light guiding structure 4.

The light guiding structure 4 includes a light coupling member 41, a light guiding film (LGF) 42 and a light transmitting connecting member 43. The light coupling member 41 is disposed corresponding to the light emitting diode 3, and part of the light emitted from the light emitting diode 3 is incident on the light coupling member 41. The optical coupling element 41 of the present embodiment is, for example, a lens disposed on one side of the light guiding film 42 adjacent to the light emitting diode 3. In addition, the optical coupling member 41 of the present embodiment has a reflecting surface 411 and a light coupling surface 412. The optical coupling member 41 is coupled to the light guiding film 42 by the light coupling surface 412, and at least part of the light is passed through The reflecting surface 411 is reflected to the light coupling surface 412, and is emitted from the light coupling surface 412 to enter the light guiding film 42. The reflecting surface 411 has an angle with the light coupling surface 412, and the angle is less than or equal to 45 degrees.

The light guiding film 42 is disposed corresponding to the light coupling member 41, and the thickness of the light guiding film 42 is smaller than the height of the light emitting surface 32 of the light emitting diode 3. The thickness of the light guiding film 42 of the present embodiment ranges, for example, from 0.15 to 0.25 mm.

The light-transmitting connecting member 43 is disposed at a boundary of one of the optical coupling member 41 and the light guiding film 42. The light-transmitting connecting member 43 is a colloid to fill the gap between the optical coupling member 41 and the light guiding film 42 , and the light-transmitting connecting member 43 is used to smooth the optical coupling member 41 and the light guiding film 42 . One of the sections is poor. It should be noted that the light-transmitting connecting member 43 and the optical coupling member 41 and the light guiding film The junction of 42 must be relatively smooth to prevent light from being emitted, and light leakage occurs.

As can be seen from FIG. 2A, one side of the light guiding structure 4 adjacent to the light emitting diode 3 has a first height H ₁ , and the side of the light guiding structure 4 away from the light emitting diode 3 has a second height H. ₂ , the first height H ₁ is greater than the second height H ₂ , the first height H ₁ of the embodiment ranges from 0.4 mm to 0.65 mm, and the second height H ₂ ranges from 0.15 to 0.25 mm. In more detail, the first height H ₁ of the light guiding structure 4 is greater than or equal to the height of one of the light emitting surfaces 32 of the light emitting diode 3, so that the emitted light of the light emitting diode 3 can directly enter the light guiding structure 4 Then, the light is then emitted from the light exit surface E of the light guiding structure 4. The direction of the light emitted by the light-emitting diodes 3 is guided by the light guiding structure 4 to provide a uniform brightness of the display panel. The display panel can be disposed in the area of the second height H ₂ to reduce the thickness of the entire display device.

In addition, the light-emitting module 2 of the present embodiment further includes a circuit board 5 that is connected to the light-emitting diode 3 and the light-guiding structure 4, and the light-emitting diodes 3 are electrically connected to the circuit board 5 and are used by the circuit board. 5 is driven, and a part of the light guiding structure 4 is disposed on the circuit board 5.

Second embodiment

3A and FIG. 3B, FIG. 3A is a cross-sectional view of a light emitting module according to a second embodiment of the present invention, and FIG. 3B is a schematic view of the light emitting module of FIG. 3A. The light-emitting module 2a of the present embodiment is different from the light-emitting module 2 in that the light-emitting module 2a of the present embodiment is not provided with a circuit board, and part of the light-guiding structure 4a is fitted to the light-emitting diode 3a and connected. Luminous dipole The case 33 of the body 3a is exemplified by the fact that the light coupling member 41a in the light guiding structure 4a is fitted to the light emitting diode 3a. Thereby, the connection state of the light-emitting diode 3a and the light-guiding structure 4a can be connected to the light-emitting diode 3 and the light-guiding structure 4 by the circuit board 5 as in the first embodiment, or the light-guiding structure as in the embodiment 4a is fitted to the casing 33 of the light-emitting diode 3a, which is not limited to the present invention. The light guiding film 42 and the light transmitting connecting member 43 of the present embodiment have the same technical features as the light guiding film 42 and the light transmitting connecting member 43 in the above embodiment, and thus will not be described again.

Third embodiment

4A and FIG. 4B, FIG. 4A is a cross-sectional view of a light-emitting module according to a third embodiment of the present invention, and FIG. 4B is a schematic view of the light-emitting module of FIG. 4A. The light emitting module 2b includes at least one light emitting diode 3 and a light guiding structure 4b. The light-emitting diode 3 and the above-described embodiment have the same technical features as the light-emitting diode 3, and thus will not be described again.

The light-emitting module 2b of the present embodiment is different from the light-emitting module 2 in that the light-guiding structure 4b includes an optical coupling member 41b, a light guiding film 42, a light-transmitting connecting member 43b, and an auxiliary molding member 44.

The auxiliary molding 44 of the present embodiment is, for example, a diaphragm formed by thermoplastic molding. The auxiliary molding 44 has a receiving portion 441 which is, for example, a cavity. In this embodiment, the accommodating portion 441 is disposed corresponding to the illuminating diode 3, and the shape and size of the accommodating portion 441 are not limited to the present invention. In other embodiments, the accommodating portion 441 can be further adjusted. The size is, for example, provided in correspondence with the plurality of light-emitting diodes 3 by a housing portion 441.

The optical coupling member 41b is received in the receiving portion 441 of the auxiliary molding 44. The corresponding light-emitting diode 3 is disposed, and its size is substantially the same as that of the accommodating portion 441. The optical coupling member 41b of this embodiment is a transparent solid colloid, such as epoxy resin or silicone rubber. The light coupling member 41b has a reflecting surface 411b, and the light emitted from the light emitting diode 3 is incident on the light guiding film 42 via the reflecting surface 441.

Fourth embodiment

Please refer to FIG. 5, which is a cross-sectional view of a light emitting module according to a fourth embodiment of the present invention. The light emitting module 2c includes at least one light emitting diode 3 and a light guiding structure 4c. The light-emitting diode 3 has the same technical features as the light-emitting diode 3 in the above embodiment, and thus will not be described again.

The light-emitting module 2c of the present embodiment is different from the light-emitting module 2 in that the light-guiding structure 4c includes an optical coupling member 41c, a light guiding film 42 and a light-transmitting connecting member 43. The optical coupling member 41c of the present embodiment is a light guide plate. In more detail, the optical coupling member 41c is a part of a wedge-shaped light guide plate (GGP), and the optical coupling member 41c has a side adjacent to the light-emitting diode 3 An enlarged portion 413 has a first height H ₁ ; the light guiding film 42 has a second height H ₂ , and the first height H ₁ is greater than the second height H ₂ . The first height H ₁ is greater than the second height H ₂ , and the first height H ₁ of the present embodiment ranges from 0.4 mm to 0.65 mm, and the second height H ₂ ranges from 0.15 to 0.25 mm.

The light guiding structure 4c of the embodiment further includes a positioning piece 45 for connecting the optical coupling member 41c and the light guiding film 42. The positioning piece 45 is, for example, a reflection sheet. Further, the size and size of the positioning piece 45 are not limited to the present invention. The light-transmitting connecting member 43 is disposed on the optical coupling member 41c and the light guiding film 42 In between, light is incident on the light guiding film 42 from the optical coupling 41c. The two sides of the positioning piece 45 are glued to the optical coupling member 41c and the light guiding film 42 to connect the optical coupling member 41c and the light guiding film 42 and carry the light transmitting connecting member 43.

Fifth embodiment

Please refer to FIG. 6A, which is a cross-sectional view of a light emitting module according to a fifth embodiment of the present invention. The light emitting module 2d includes at least one light emitting diode 3b and a light guiding structure 4d. The structure of the light-emitting diode 3b itself has the same technical features as the light-emitting diode 3a of the second embodiment, and the light-guiding film 42 and the light-transmitting connecting member 43 of the present embodiment are the same as the above embodiment. The light guiding film 42 and the light transmitting connecting member 43 have the same technical features, and thus will not be described again.

The illuminating module 2d of the present embodiment is different from the illuminating module 2a in that the illuminating module 2d of the present embodiment has two symmetrical optical coupling members 41d in the light guiding structure 4d and another light transmitting connecting member. 43 is symmetrically disposed on the light guiding film 42. The optical coupler 41d, the light-transmitting link 43, and the light-guiding film 42 are directly coupled to the light-emitting diode 3b. Thereby, the light guiding film 42 can directly correspond to the center of the light emitting diode die 31b and the light emitting diode 3b, and the light emitting portion (center) of the light emitting diode 3b can be directly incident. In the light guiding film 42 of the light guiding structure 4d, the amount of light emitted by the light emitting diode 3b into the light guiding film 42 is increased, and the light of the other portion of the light coupling member 41d incident on the light guiding structure 4d passes through The light link 43 is incident on the light guiding film 42 to improve light utilization.

In addition, the light guiding structure may have a symmetrical optical coupling member, and the embodiment thereof may also be as shown in FIG. 6B. FIG. 6B is a cross-sectional view showing another embodiment of the light emitting module shown in FIG. 6A. The light-emitting module 2e is directly connected to the light-coupling member 41e of the light-guiding structure 4e. For example, the light-coupling member 41e has a concave portion, and the light-guiding structure 4e is fitted in the concave portion of the optical coupling member 41e. Thereby, all the light emitted by the light-emitting diode 3b can be incident on the light coupling member 41e of the light guiding structure 4e, and is incident on the light guiding film 42 via the light-transmitting connecting member 43, and the light guiding film 42 is also directly Corresponding to the center of the light-emitting diode die 31b and the light-emitting diode 3b, the same amount of light that the light emitted from the light-emitting diode 3b enters the light-guiding film 42 is obtained, and the other portion is incident on the light-guiding structure 4e. The light of the optical coupling member 41e is incident on the light guiding film 42 via the light-transmitting connecting member 43 to improve the light utilization efficiency.

In summary, the light emitting diode system of the light emitting module of the present invention emits light and enters the light guiding structure, wherein at least part of the light of the light coupling member incident on the light guiding structure is incident on the light guiding film via the light transmitting connecting member. . Since the light-transmitting connecting member connects the optical coupling member and the light guiding film, the light coupling member can preferably illuminate the light of the light-emitting diode into the light guiding film by the light-transmitting connecting member. Further, the light guiding film of the light guiding structure of the present invention is thinner than the conventional light guiding plate, and when applied to a display device or other light emitting device, the overall thickness can be made thinner.

The thickness of the light guiding structure of the present invention is thinner than that of the prior art, and can be widely applied to a thin and light display device. In addition, the light emitting module of the present invention can enhance the light entering by the light emitting diode. The amount of light in the light guiding structure ensures the luminous efficacy of the light emitting module.

The above is intended to be illustrative only and not limiting. 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, 2, 2a, 2b, 2c, 2d‧‧‧ lighting modules

11, 3, 3a, 3b‧‧‧Lighting diodes

111, 31, 31b‧‧‧Light-emitting diode grains

112, 32, E‧‧‧ shiny surface

12‧‧‧Light guide plate

13, 5‧‧‧ circuit board

33, 33b‧‧‧ shell

4, 4a, 4b, 4c, 4d, 4e‧‧‧ light guiding structure

41, 41a, 41b, 41c, 41d, 41e‧‧‧ optical coupling

411, 411b‧‧‧reflecting surface

412‧‧‧Light coupling surface

413‧‧‧Expanded

42‧‧‧Light guide diaphragm

43, 43b‧‧‧Light connection

44‧‧‧Auxiliary molded parts

441‧‧‧ 容 部

45‧‧‧ Positioning film

H ₁ ‧‧‧first height

H ₂ ‧‧‧second height

1 is a partial cross-sectional view of a light emitting module of a conventional display device; FIG. 2A is a cross-sectional view of a light emitting module according to a first embodiment of the present invention; FIG. 2B is a schematic view of the light emitting module of FIG. 2A; FIG. 3B is a cross-sectional view of the light emitting module of the third embodiment of the present invention; FIG. 4B is a cross-sectional view of the light emitting module of the third embodiment of the present invention; Figure 5 is a cross-sectional view of a light-emitting module according to a fourth embodiment of the present invention; Figure 6A is a cross-sectional view of a light-emitting module according to a fifth embodiment of the present invention; and Figure 6B is a light-emitting mode shown in Figure 6A. A cross-sectional view of another embodiment of the set.

2‧‧‧Lighting module

3‧‧‧Lighting diode

31‧‧‧Light-emitting diode grains

32. E‧‧‧Glossy

4‧‧‧Light guiding structure

41‧‧‧Optical coupling

411‧‧‧reflecting surface

412‧‧‧Light coupling surface

42‧‧‧Light guide diaphragm

43‧‧‧Light connecting parts

5‧‧‧Circuit board

H ₁ ‧‧‧first height

H ₂ ‧‧‧second height

Claims (20)

A light-emitting module comprising: at least one light-emitting diode and emitting a light; and a light-guiding structure disposed opposite to the light-emitting diode, and comprising: an optical coupling member, at least part of the light being emitted by the light-emitting diode a diode is incident on the optical coupling member; a light guiding film is disposed corresponding to the optical coupling member; and a light transmitting connecting member is disposed at a boundary of the optical coupling member and the light guiding film, wherein the light is incident The light of the coupling member is incident on the light guiding film at least partially via the light transmitting connecting member. The light-emitting module of claim 1, wherein the light-transmitting connector is a colloid. The light-emitting module of claim 1, wherein the light-transmitting connecting member fills a gap between the optical coupling member and the light-guiding film. The light-emitting module of claim 1, wherein the light-transmitting connecting member smoothes a step difference between the optical coupling member and the light guiding film. The light-emitting module of claim 1, wherein the thickness of the light-guiding film is smaller than a height of a light-emitting surface of the light-emitting diode. The light-emitting module of claim 1, wherein the light-guiding structure has a first height adjacent to one side of the light-emitting diode and a second height away from a side of the light-emitting diode. The first height is greater than the second height. The light-emitting module of claim 6, wherein the first height is greater than or equal to a height of a light-emitting surface of the light-emitting diode. The lighting module of claim 6, wherein the first height ranges from 0.4 mm to 1.0 mm. The illuminating module of claim 6, wherein the second height ranges from 0.05 mm to 0.35 mm. The light-emitting module of claim 1, wherein the light-coupling member is a light guide plate and has an enlarged portion adjacent to one side of the light-emitting diode. The light-emitting module of claim 1, wherein the optical coupling member is a part of a wedge-shaped light guide plate. The light-emitting module of claim 1, wherein the light-guiding structure further comprises: a positioning piece that connects the optical coupling member and the light guiding film. The illuminating module of claim 12, wherein the locating piece is a reflecting piece. The light-emitting module of claim 1, wherein the light-coupling member is a lens disposed on a side of the light-guiding film adjacent to the light-emitting diode. The light-emitting module of claim 1, wherein the optical coupling member has a reflective surface and an optical coupling surface, and the optical coupling member is coupled to the light guiding film by the optical coupling surface. At least a portion of the light is incident on the light guiding film via the reflecting surface and the light coupling surface. The lighting module of claim 15, wherein the There is an angle between the emitting surface and the light coupling surface, and the angle is less than or equal to 45 degrees. The light-emitting module of claim 1, wherein the light-guiding structure further has an auxiliary molding member, the auxiliary molding member having a receiving portion, the optical coupling member being disposed in the receiving portion. The illuminating module of claim 1, wherein the optical coupling member has a reflecting surface, and the light is incident on the light guiding film via the reflecting surface. The light-emitting module of claim 1, wherein when the light-emitting diodes are plural, the light-emitting diode systems are disposed on one side of the light-guiding structure. The light emitting module of claim 1, further comprising: a circuit board connecting the light emitting diode and the light guiding structure.