TW201525584A - Backlight module - Google Patents

Abstract

A backlight module is provided, including a light guide plate and a light bar. The light guide plate forms a recess, and a distance is between the recess and a side of the light guide. The light bar is fixedly disposed in the recess.

Description

Backlight module

The present invention relates to a backlight module; in particular, to an edge-type backlight module.

Referring to FIG. 1 , an edge-type backlight module 1 mainly includes a light guide plate 10 and a light bar 20 , and the light bar 20 is It is disposed on one side of the light guide plate 10. The light bar 20 includes a substrate 20a and a plurality of light emitting elements 20b spaced apart from each other on the substrate 20a. The light provided by the light-emitting element 20b can enter the light guide plate 10 through one of the light-incident surfaces of the light guide plate 10, and then be led out from the light-emitting surface of one of the light guide plates 10 to generate a light source.

It should be understood that the gap P between the plurality of light-emitting elements 20b and the light guide plate 10 has a direct influence on the luminance of the edge-lit backlight module 1. For example, when the gap P is too small, a region adjacent to the light-emitting elements 20b of the light guide plate 10 forms a bright region, and regions outside the bright regions relatively form a dark region, and these bright regions and dark regions The surface light source provided by the light guide plate 10 will be uneven, that is, a so-called hot spot phenomenon. On the other hand, when the gap P is too large, the optical performance of the backlight module 1 may be shifted or weakened. Therefore, how to control the gap P between the light-emitting element 20b and the light guide plate 10 is worthy of consideration by the relevant personnel.

The invention provides a backlight module, in particular to an edge-lit backlight module, which can be applied to a liquid crystal display (LCD).

The invention provides a backlight module, which can effectively control the gap between the light-emitting element and the light guide plate, and can also improve the optical performance of the backlight module.

An embodiment of the present invention provides a backlight module including a light guide plate; a groove formed on the light guide plate, and a distance between the groove and one side of the light guide plate; and a light bar, It is fixedly disposed in the groove.

In one embodiment, the groove is formed on one surface of the light guide plate, and the light guide plate has a light exit surface, wherein the light exit surface is opposite to the surface.

In one embodiment, the light strip is connected to one of the first sidewalls of the recess, and the first sidewall is adjacent to the side of the light guide.

In one embodiment, the light guide plate has a light incident surface formed on one of the second sidewalls of the recess, and the second sidewall is opposite to the first sidewall.

In one embodiment, the groove is formed on one surface of the light guide plate, and the light guide plate has a light exit surface, wherein the light exit surface is opposite to the surface.

In one embodiment, the backlight module further includes a heat sink, the light strip is connected to the heat sink, and the heat sink is fixedly disposed in the groove.

In an embodiment, the heat sink has a metal material.

In one embodiment, the backlight module further includes a fixing member, and the side of the light guide plate penetrates into the groove and is coupled to the heat sink.

In an embodiment, the fixing member comprises a screw, a rivet or a card tenon.

In one embodiment, the light strip further includes a substrate and a plurality of light emitting elements, and the light emitting elements are disposed on the substrate.

In an embodiment, the light emitting element is a light emitting diode.

The above and other objects, features, and advantages of the invention will be apparent from

1, 2‧‧‧ backlight module

10‧‧‧Light guide plate

10a‧‧‧lower surface

10b‧‧‧ Short side

20‧‧‧Light strips

20a‧‧‧Substrate

20b‧‧‧Lighting elements

30‧‧‧ Heat sink

32‧‧‧Connecting Department

40‧‧‧Fixed parts

50‧‧‧ Backplane

60‧‧‧ plastic frame

D‧‧‧Distance

P‧‧‧ gap

R‧‧‧ groove

R1‧‧‧ first side wall

R2‧‧‧ first side wall

S1‧‧‧ into the glossy surface

S2‧‧‧ shiny surface

Figure 1 shows a schematic diagram of a conventional edge-lit backlight module.

2A is a cross-sectional view showing a backlight module according to an embodiment of the present invention.

Fig. 2B is a view showing the light guide plate of Fig. 2A.

Referring to FIG. 2A, the backlight module 2 of the embodiment of the present invention is, for example, an edge-type backlight module, which can be applied to a liquid crystal display. The backlight module 2 mainly includes a light guide plate 10 , a light strip 20 , a heat sink 30 , and at least one fixing member 40 .

The light guide plate 10 is a rectangular plate body (please refer to FIG. 2B together), and the lower surface 10a thereof is formed with a recess R which is recessed toward the light guide plate 10. The groove R has a long rectangular structure which is disposed along one short side 10b of the light guide plate 10 and spaced apart from the short side 10b by a distance D. It should be understood that the groove R of some embodiments of the present invention may also be disposed along one long side of the light guide plate 10 and spaced apart from the long side by a distance. As shown in FIGS. 2A and 2B, the groove R of this embodiment has The first side wall R1 and the second side wall R2 are oppositely disposed, and the first side wall R1 is closer to the short side 10b of the light guide plate 10 than the second side wall R2.

Referring to FIG. 2A, the light bar 20 includes an elongated substrate 20a and a plurality of light emitting elements 20b, and the light emitting element 20b is along a long axis direction of the substrate 20a (parallel to the Y axis in FIG. 2A). They are disposed on the substrate 20a at intervals (as shown in Fig. 1). It should be understood that since the substrate 20a in FIG. 2A extends in the Y-axis direction, only one light-emitting element 20b is connected to the substrate 20a as shown in the drawing. In this embodiment, the substrate 20a may be a printed circuit board (PCB) or a flexible printed circuit (FPC), and the light emitting element 20b may include a plurality of light emitting diodes (light emitting diodes). LED).

Continuing to refer to FIG. 2A, the heat sink 30 has a T-shaped cross-sectional structure that extends along the Y-axis direction. The connecting portion 32 parallel to the Z-axis direction of the heat sink 30 (T-shaped cross-sectional structure) is connected to the first side wall R1 of the recess R of the light guide plate 10. Furthermore, the light bar 20 is connected to the connecting portion 32 of the heat sink 30. In this embodiment, the light bar 20 can be adhered to the heat sink 30 by using a thermal conductive adhesive. Further, the heat sink 30 may have a metal material such as aluminum.

Continuing to refer to FIG. 2A, the fixing member 40 passes through the first short side 10b of the light guide plate 10 through the first side wall R1 and enters the recess R, and is coupled to the connecting portion 32 of the heat sink 30. Thereby, the heat sink 30 and the light strip 20 can be fixed in the recess R (more precisely, the heat sink 30 and the light strip 20 can be fixedly connected to the first side wall R1 of the recess R). In this embodiment, the fixing member 40 can be a screw, a rivet or a cassette or the like.

As shown in FIG. 2A, the backlight module 2 of the embodiment also includes a back The board 50 and a plastic frame 60. After the light guide plate 10, the light strip 20, the heat sink 30 and the fixing member 40 are assembled, the heat sink 30 can be supported on the back plate 50, and then the plastic frame 60 is placed in the back plate 50 to complete the backlight module. 2 the entire assembly work. Since the light guide plate 10, the light-emitting strip 20, the heat sink 30, and the fixing member 40 can be assembled into a fixed whole body and then assembled with the back plate 50 and the plastic frame 60, the assembly process of the backlight module 2 can be simplified, and the help is facilitated. Increased production yield.

It should be understood that the second side wall R2 of the groove R facing the light-emitting element 20b of the light-emitting strip 20 is the light-incident surface S1 of the light guide plate 10, and the light-emitting surface S2 of the light guide plate 10 is formed on the light guide surface S2. The opposite side of the lower surface 10a of the light panel 10.

It should be noted that, by the above-mentioned structural design, the light-emitting strip 20 and the light guide plate 10 of the present embodiment can be stably assembled to each other, and can effectively and uniformly pass through the size of the groove R of the control light guide plate 10. The gap P between the light-emitting elements 20b and the light-incident surface S1 is controlled to improve defects such as a hot spot phenomenon or a poor optical performance of a conventional backlight module.

In summary, the present invention provides an edge-lit backlight module, which can be applied to a liquid crystal display, which mainly includes a light guide plate and a light bar, wherein the light guide plate is formed with a groove, and the groove and the light guide plate One side is separated by a distance, and the light bar is fixedly disposed in the groove. According to the above feature design, the backlight module of the present invention can effectively control the gap between the light bar and the light guide plate, thereby improving the optical performance of the backlight module.

Although the embodiments of the present invention and its advantages are disclosed above, it should be understood that those skilled in the art can make modifications, substitutions, and refinements without departing from the spirit and scope of the invention. Moreover, the scope of protection of the present invention is not limited to the specific embodiments described in the specification. Process, machine, manufacture, material composition, apparatus, method, and procedure, any one of ordinary skill in the art can understand the processes, machines, manufactures, compositions, devices, The methods and procedures can be used in accordance with the present invention as long as they can perform substantially the same function or achieve substantially the same results in the embodiments described herein. Accordingly, the scope of the invention includes the above-described processes, machines, manufactures, compositions, devices, methods, and steps. In addition, the scope of each of the claims constitutes an individual embodiment, and the scope of the invention also includes the combination of the scope of the application and the embodiments.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. Those skilled in the art having the ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

2‧‧‧Backlight module

10‧‧‧Light guide plate

10a‧‧‧lower surface

10b‧‧‧ Short side

20‧‧‧Light strips

20a‧‧‧Substrate

20b‧‧‧Lighting elements

30‧‧‧ Heat sink

32‧‧‧Connecting Department

40‧‧‧Fixed parts

50‧‧‧ Backplane

60‧‧‧ plastic frame

D‧‧‧Distance

P‧‧‧ gap

R‧‧‧ groove

R1‧‧‧ first side wall

R2‧‧‧ first side wall

S1‧‧‧ into the glossy surface

S2‧‧‧ shiny surface

Claims (10)

A backlight module includes: a light guide plate; a groove formed on the light guide plate, wherein the groove is spaced apart from a side of the light guide plate; and a light bar fixedly disposed on the In the groove. The backlight module of claim 1, wherein the groove is formed on a surface of the light guide plate, and the light guide plate has a light exit surface, wherein the light exit surface is opposite to the surface. The backlight module of claim 1, wherein the light strip is connected to one of the first sidewalls of the recess, and the first sidewall is adjacent to the side of the light guide. The backlight module of claim 3, wherein the light guide plate has a light incident surface formed on one of the second sidewalls of the recess, and the second sidewall is opposite to the first sidewall. The backlight module of claim 1, wherein the backlight module further comprises a heat sink, the light strip is connected to the heat sink, and the heat sink is fixedly disposed in the recess. The backlight module of claim 5, wherein the heat sink has a metal material. The backlight module of claim 5, wherein the backlight module further comprises a fixing member, and the side of the light guide plate penetrates into the groove and is coupled to the heat sink. The backlight module of claim 7, wherein the fixing member comprises Screws, rivets or cassettes. The backlight module of claim 1, wherein the light bar further comprises a substrate and a plurality of light emitting elements, and the light emitting elements are disposed on the substrate. The backlight module of claim 9, wherein the light emitting elements are light emitting diodes.