TW201514423A - Side view backlight module - Google Patents

Abstract

A side view backlight module includes a light guiding plate, a light emitting diode (LED) mounted on an end of the light guiding plate, and a lens mounted on a top surface of the light guiding plate. The lens includes a bottom surface adhered to the top surface of the light guiding plate, and a light adjusting surface extending from the bottom surface. The light guiding plate includes a bottom surface opposite to the top surface. A micro structure region is defined in a central of the bottom surface of the light guiding plate and faces the light adjusting surface of the lens.

Description

Side-in backlight module

The invention relates to a backlight module, in particular to a side-entry backlight module.

The conventional side-lit backlight module includes a carrier board, a light-emitting diode mounted on the carrier board, an encapsulation layer covering the LED body, and a lens disposed on the carrier board and the LED body. Fluorescent powder is uniformly distributed in the encapsulation layer. The light emitted by the light-emitting diode excites the phosphor in the encapsulation layer to obtain predetermined light of a specific color temperature and color, and the predetermined light is diffused by the lens to illuminate. However, since the light-emitting diode has a light-emitting characteristic in which the central light is strong and the peripheral light intensity is small, the phosphor powders in the interior of the package layer are inconsistently excited, and thus the brightness of the predetermined light entering the carrier plate is inconsistent. The backlight module has uneven brightness and color aperture.

In view of this, it is necessary to provide a side-in type backlight module with uniform brightness everywhere.

A side-lit backlight module includes a light guide plate, a light-emitting diode disposed on an end surface of the light guide plate, and a lens disposed on a top surface of the light guide plate, wherein the lens includes a top surface of the light guide plate The bottom surface and the light distribution surface extending from the bottom surface, the bottom surface of the light guide plate opposite to the top surface is provided with a dot area, and the dot area is disposed opposite to the middle of the light distribution surface of the lens.

Compared with the prior art, in the present invention, the light emitted by the light-emitting diode disposed on one side of the lens is scattered by the halftone dot area on the bottom surface of the lens and the light distribution surface of the light-emitting surface is light-distributed, thereby reducing the light intensity in the middle of the lens. The intensity of the peripheral edge of the lens is enhanced, thereby achieving the effect of eliminating dark areas and uniform light, and the structure is simple and the optical effect is good.

The invention will now be further described with reference to the specific embodiments thereof with reference to the accompanying drawings.

1 is a side view of the side-lit backlight module of the first embodiment of the present invention with the reflector removed.

2 is a top plan view of the side-entry backlight module of FIG. 1.

3 is a cross-sectional view of the side-entry backlight module shown in FIG. 2.

4 is a cross-sectional view of a side-lit backlight module in accordance with a second embodiment of the present invention.

As shown in FIG. 1 and FIG. 2 , the side-lit backlight module 100 of the first embodiment of the present invention includes a light guide plate 10 , a light-emitting diode 30 disposed at one end of the light guide plate 10 , and the light guide plate 10 . A plurality of halftone dot regions 50 on the bottom surface, a plurality of lenses 70 fixed to the top surface of the light guide plate 10 and facing the halftone dot regions 50, and two reflective plates 90 (see FIG. 3) fixed to opposite sides of the light guide plate 10.

The light guide plate 10 is a longitudinally long and uniform thickness plate for mixing the light emitted by the LEDs 30. The bottom surface of the light guide plate 10 is parallel to the top surface thereof.

The halftone dot areas 50 are spaced apart in parallel along the longitudinal direction of the light guide plate 10. Each of the halftone dot regions 50 extends in the lateral direction of the light guide plate 10 and extends through the entire lateral direction of the light guide plate 10. The dot area 50 is used to scatter light reaching the halftone dot area 50. Each of the halftone dot areas 50 includes a recess 51 recessed from the bottom surface of the light guide plate 10 toward the top surface and a microstructure 53 located in the recess 51. These pockets 51 are arranged in parallel along the longitudinal direction of the light guide plate 10. Each of the pockets 51 extends through the lateral direction of the light guide plate 10. The longitudinal section of each pocket 51 is substantially square. The microstructures 53 at each dot area 50 have the same density. The density of the microstructures 53 of the different halftone dot regions 50 gradually increases along the longitudinal direction of the light guide plate 10 from the end near the light emitting diode 30 toward the end remote from the light emitting diode 30. It can be understood that these microstructures can be such protrusions, depressions or other structures as long as the effect of dissipating light can be achieved.

Referring to FIG. 3 simultaneously, the reflector 90 is made of a highly reflective material and is attached to opposite sides of the light guide plate 10. The area of each of the light guide plates 10 is greater than or equal to the area of the side surface of the light guide plate 10, so as to completely cover the side surface of the light guide plate 10. In this embodiment, each of the reflecting plates 90 is an elongated thin plate having a size equal to the size of the side surface of the light guiding plate 10, and the reflecting plate 90 is attached to the side of the light guiding plate 10 to completely cover the light guiding plate. The side of the 10th.

Referring to FIG. 1 and FIG. 3 again, each lens 70 includes a bottom surface 71, a first light-emitting surface 73 protruding outward from the edge of the bottom surface 71, and a second light-emitting surface 75 extending vertically upward from the top end of the first light-emitting surface 73. A light distribution surface 77 formed concavely from the top end of the second light-emitting surface 75 toward the light guide plate 10. The lens 70 is a rotating body, and a longitudinal section of the first light-emitting surface 73 is convexly curved, a longitudinal section of the second light-emitting surface 75 is rectangular, and a longitudinal section of the light-distributing surface 77 is V-shaped. . The bottom surface 71 is attached to the top surface of the light guide plate 10 and the middle portion faces the corresponding half dot area 50. The diameter of the first light-emitting surface 73 is larger than the diameter of the second light-emitting surface 75. The diameter of the bottom surface 71 is equal to or larger than the lateral dimension of the light guide plate 10, so that after the lens 70 is attached to the light guide plate 10, the corresponding dot area 50 can be completely covered. In this embodiment, the diameter of the bottom surface 71 of each lens 70 is equal to the lateral dimension of the light guide plate 10. The light distribution surface 77 is a reflection surface for reflecting the light reaching the lens 70, and then exiting from the first light exit surface 73 and the second light exit surface 75, thereby reducing the light intensity and strengthening in the middle of the lens 70. The light intensity around the periphery of the lens 70, which in turn causes the light to exit evenly outward.

The light emitting diode 30 is mounted at one end of the light guide plate 10 and has a size smaller than or equal to the size of the corresponding end portion of the light guide plate 10. In this embodiment, the size of the light emitting diode 30 is equal to the size of the corresponding end of the light guide plate 10.

When the side-lit backlight module 100 is in operation, light emitted from the light-emitting diodes 30 enters the light guide plate 10 from one end of the light guide plate 10 toward the opposite end and is mixed in the longitudinal direction of the light guide plate 10. After a part of the light reaches the halftone dot area 50, the microstructure 53 of the halftone dot area 50 scatters the light rays, and then the light rays are emitted toward the lens 70. A part of the light passes through the bottom surface 71 of the lens 70 directly through the first light exiting surface 73. The second light exit surface 75 is emitted, and the other portion of the light is reflected by the light distribution surface 77 and then exits through the first light exit surface 73 and the second light exit surface 75. Thus, the light intensity in the middle portion of the lens 70 is weakened, and the peripheral light intensity is enhanced. The purpose of achieving the uniform light intensity and increasing the light exit angle; the other part of the light is directed to the two reflectors 90, and after being reflected by the two reflectors 90, the self-microstructure 53 is repeatedly scattered to the lens 70, and the light path of the light is distributed through the lens 70. , to achieve a uniform output of light.

4 is a side-lit backlight module 100a according to a second embodiment of the present invention. The side-entry backlight module 100a is similar to the side-entry backlight module 100 of the first embodiment, and the difference is that: The lens 70a has a bottom surface 71a, a first light-emitting surface 73a protruding outward from the edge of the bottom surface 71a, and a light-receiving surface 77a recessed from the top end of the first light-emitting surface 73a. The light-receiving surface 77a is V-shaped. The longitudinal section of the lens 70a has an "M" shape. The light distribution surface 77a is for refracting light reaching the middle of the lens 70a to be emitted toward the first light exit surface 73a.

In the embodiment, when the side-lit backlight module 100a is in operation, the light emitted from the LEDs 30 is incident on the light guide plate 10 from one end of the light guide plate 10 toward the opposite end and along the length of the light guide plate 10. Mix light on it. After a part of the light reaches the halftone dot area 50, the microstructure 53 of the halftone dot area 50 scatters the light, and then the light is emitted toward the lens 70a. A part of the light passes through the bottom surface 71 of the lens 70 directly through the first light exiting surface 73a. The other part of the light is emitted to the light distribution surface 77a, and a part of the light is emitted directly to the light distribution surface 77a. The other part of the light is directly emitted through the light distribution surface 77a, and is emitted from the first light exit surface 73a. In this way, the light intensity in the middle of the lens 70a is weakened, and the peripheral light intensity is enhanced, thereby achieving the purpose of uniform light intensity and increasing the light exit angle; another portion of the light is directed to the two reflectors 90, and is reflected by the two reflectors 90. After the microstructures 53 are scattered to the lens 70a, the light exiting the light path through the lens 70a achieves uniform light emission.

Compared with the prior art, the light emitted by the light-emitting diode 30 disposed on the light guide plate 10 in the present invention is scattered by the halftone dot area 50 of the bottom surface of the light guide plate 10 and the light distribution surface 77 of the lens 70 is light-distributed. Achieve the role of eliminating dark areas and even light.

Further, in the present invention, the size of the light-emitting diode 30 is not limited by the size of the halftone dot region 50, and any light can be introduced into the light guide plate 10 as long as it can be fitted to the end surface of the light guide plate 10.

It is to be understood that those skilled in the art can make various other changes and modifications in accordance with the technical concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.

10‧‧‧Light guide plate

30‧‧‧Lighting diode

50‧‧‧ outlet area

51‧‧‧ recesses

53‧‧‧Microstructure

70, 70a‧‧ lens

71, 71a‧‧‧ bottom

73, 73a‧‧‧The first shiny surface

75‧‧‧second glazing

77, 77a‧‧‧Glossy surface

90‧‧‧reflector

100, 100a‧‧‧ Side-in backlight module

no

10‧‧‧Light guide plate

50‧‧‧ outlet area

51‧‧‧ recesses

53‧‧‧Microstructure

70‧‧‧ lens

71‧‧‧ bottom

73‧‧‧The first glazing

75‧‧‧second glazing

77‧‧‧Glossy surface

90‧‧‧reflector

100‧‧‧Side-in backlight module

Claims (10)

A side-lit backlight module includes a light guide plate, a light-emitting diode disposed on an end surface of the light guide plate, and a lens disposed on a top surface of the light guide plate, wherein the lens includes a top surface of the light guide plate The bottom surface and the light distribution surface extending from the bottom surface are improved in that a bottom surface of the light guide plate opposite to the top surface is provided with a dot area, and the half dot area is disposed opposite to the middle of the light distribution surface of the lens. The side-entry backlight module of claim 1, wherein the halftone dot area comprises a recess recessed from a bottom surface of the light guide plate toward a top surface and a microstructure located in the recess. The side-entry backlight module of claim 2, wherein the number of the dot areas is plural, and the dot areas are arranged in parallel along the longitudinal direction of the light guide plate and penetrate the lateral direction of the light guide plate. The side-entry backlight module of claim 3, wherein the density of the microstructures of the plurality of dot regions is along a longitudinal direction of the light guide plate from an end near the light emitting diode to away from the light emitting diode One end gradually increases. The side-entry backlight module of claim 3, wherein the density of the microstructures in each of the dot areas is the same. The side-entry backlight module of claim 1, wherein the opposite sides of the light guide plate are respectively provided with a reflective plate. The side-entry backlight module of claim 6, wherein the reflector completely covers opposite sides of the light guide plate. The side-entry backlight module of claim 1, wherein the light distribution surface has a V-shaped longitudinal section. The side-entry backlight module of claim 8, wherein the light distribution surface is a reflective surface or a refractive surface. The side-entry backlight module of claim 1, wherein the lens further comprises a light-emitting surface connecting the light distribution surface and the bottom surface.