TW201602689A - Light guide plate and backlight module - Google Patents

Abstract

A light guide plate is provided, and has: a light guiding portion, and a recess disposed on a side surface of the light guide plate having a plurality of side walls and a light incident surface. The recess is used for receiving at least one light source of a light emitting element so that light from the light source passes through the light incident surface of the recess and enters into the light guide plate. And, a backlight module has the aforementioned light guide plate; a light emitting element having a light source received in the recess of the light guide plate; a compressible member disposed on another side surface of the light guide plate which is opposite to the side surface having the recess; and a frame for receiving the light guide plate, the light emitting element and the compressible member, wherein the compressible element is in contact with the guide plate and the frame.

Description

Light guide plate and backlight module

The present invention relates to a light guide plate and a backlight module thereof, and more particularly to a light guide plate having a light source receiving groove for accommodating a light emitting element and a backlight module thereof.

In the existing backlight module, the design of the shape of the light guide plate generally requires consideration of the electrode position of the light-emitting element. When the light-emitting element operates, heat is usually generated. Therefore, the light guide plate region that is closer to the light-emitting element is deformed by the influence of temperature. In the past, by cutting the edge of the light guide plate, the space and distance between the light guide plate and the light source are increased. The light plate will not be affected by temperature. However, this cutting method does not take into account the fixing manner of the light guide plate, and thus is not safe and reduces the product stability and quality of the liquid crystal display module.

Furthermore, in order to prevent the light guide plate from moving in the backlight module, the prior art is to fix the light-emitting element (such as a light bar) with a screw hole on the frame, and cut the left and right corners of the side of the light guide plate near the light-emitting element. a notch is formed, and a stopper is protruded from each of the two notches on the inner side of the frame, and the two stoppers are respectively abutted between the light guide plate and the frame on the left and right sides so as to be on the side of the light source and the light guide plate of the light emitting element. A gap is reserved between the two, so that the problem that the light guide plate is easily damaged by the light-emitting elements in the backlight module can be solved. However, if the position of the light-emitting element electrode in the backlight module is changed, the two notch positions of the light guide plate need to be changed. In this case, in order to fix the light guide plate, the position of the two blocks on the frame also needs to be modified together. Single frame specifications cannot be applied to other sizes of light guides, but re-opening the frame to manufacture, resulting in increased assembly and manufacturing costs.

Therefore, it is necessary to provide a light guide plate and a backlight module, which can reduce the manufacturing cost while solving the stability of the product, and solve the problems existing in the above conventional technology.

The main object of the present invention is to provide a light guide plate capable of accommodating light The source light source accommodates the groove, so that the light guide plate can be easily and stably fixed, effectively improving the stability of the backlight module, increasing the versatility of the frame, and reducing assembly and manufacturing costs.

A secondary object of the present invention is to provide a backlight module that can form a simple backlight module assembly structure by using a light guide plate having a light source receiving groove. Since a certain distance is maintained between the light guide plate and the light-emitting element, it can be ensured that the incident region of the light source on the light guide plate is not thermally deformed, yellowed, and the microstructure is not damaged. In addition, through the assistance of the compressible element, the extension rate of the light guide plate due to the temperature change is compensated, and the backlight module can be effectively prevented from being shocked by an external force or the relative position of the light source of the light guide plate and the light-emitting element greatly changes when the temperature changes. The product is damaged. On the other hand, the light source disposed in the light source receiving groove can also be well protected.

To achieve the above objective, an embodiment of the present invention provides a light guide plate including a light guiding portion, and a light source receiving groove recessed on one side of the light guide plate, having a light incident surface and a plurality of The light source receiving groove is configured to receive at least one light source of the light emitting element, and the light of the light source is incident into the light guide plate from the light incident surface of the light source receiving groove.

In an embodiment of the invention, the light emitting element further comprises a substrate.

In an embodiment of the invention, the light source is a light emitting diode.

Furthermore, another embodiment of the present invention provides a backlight module including a light guide plate having a light guiding portion and a light source accommodating groove, wherein the light source accommodating groove is recessed on one side of the light guide plate. And having a light-incident surface and a plurality of sidewalls; a light-emitting element having at least one light-emitting source, wherein the light-emitting source is received in the light source receiving groove of the light guide plate; and a compressible element is disposed on the light guide plate The other side of the light receiving recess; and a frame for receiving the light guide, the light emitting component and the compressible component, wherein the compressible component abuts the light guide and the frame.

In an embodiment of the invention, the light emitting device further includes a substrate, and the light emitting source is disposed on the substrate.

In an embodiment of the invention, the substrate is sandwiched between two sides of the light guide plate on both sides of the light source receiving groove and an inner side surface of the frame.

In an embodiment of the invention, the light source is a light emitting diode.

In an embodiment of the invention, the compressible member is made of silicone or foam.

In an embodiment of the invention, the light-emitting element and the light-incident surface of the light source receiving groove are maintained at a predetermined distance.

In an embodiment of the invention, the light guide plate has a plurality of notches on the other side opposite to the light source receiving groove for fitting the compressible member.

1‧‧‧Backlight module

10‧‧‧Light guide plate

11‧‧‧Light Guide

12‧‧‧Light source receiving slot

12a‧‧‧Into the glossy

12b‧‧‧ sidewall

20‧‧‧Lighting elements

21‧‧‧Light source

22‧‧‧Substrate

30‧‧‧Compressible components

40‧‧‧Border

Fig. 1 is a view showing the structure of a light guide plate according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing the combination of a backlight module according to a second embodiment of the present invention.

3A-3B are partial enlarged views of a backlight module according to a second embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; Furthermore, the directional terms mentioned in the present invention, such as upper, lower, top, bottom, front, rear, left, right, inner, outer, side, surrounding, central, horizontal, horizontal, vertical, longitudinal, axial, Radial, uppermost or lowermost, etc., only refer to the direction of the additional schema. Therefore, the directional terminology used is for the purpose of illustration and understanding of the invention.

First, as shown in FIG. 1 , the light guide plate 10 of the first embodiment of the present invention mainly includes a light guiding portion 11 and a light source receiving groove 12 . DETAILED DESCRIPTION OF THE INVENTION The detailed construction, assembly relationship, and operation principle of the above-described respective elements of the first embodiment will be described in detail below.

Please refer to FIG. 1 for a schematic structural view of the light guide plate 10 according to the first embodiment of the present invention. The light guiding portion 11 is used for uniformly guiding incident light, and may have a special microstructure design, but is not limited thereto. The light source accommodating groove 12 is recessed on one side of the light guide plate (ie, the light incident side), and is particularly recessed on a side of the light guide plate for incident light. The light source receiving groove 12 has a light incident surface 12a and a plurality of side walls 12b. The space formed by the light incident surface and the plurality of side walls can be used to accommodate at least one light source 21 of the light emitting element 20. Therefore, the light emitted from the light source 21 can be incident on the light guide plate 1 from the light incident surface 12a of the light source receiving groove 12. In addition, the light source accommodating groove 12 may be a long rectangle or a polygon, and the number of the plurality of side walls 12b may be two or four, for example, a vertical side wall or a pair of side walls each having an obtuse angle. The present invention is not limited thereto, as long as the light source accommodating groove 12 can accommodate the light emitting element. The light source is housed The groove 12 has a horizontal depth such that the light-emitting element 20 maintains a predetermined distance from the light-incident surface 12a of the light source receiving groove 12, for example, the depth needs to be at least slightly larger than the horizontal protruding height of the light-emitting element 20. Preferably, the preset distance can be obtained according to the thermal expansion coefficient calculation of the light guide plate 10, so as to avoid the light guide plate 10 colliding with the light-emitting element after being thermally expanded for a period of time after the light-emitting element 20 is continuously operated. The preset distance may vary depending on the material of the light guide plate.

The second embodiment of the present invention provides a backlight module 1 including a light guide plate 10, a light-emitting element 20, a compressible element 30, and a frame 40. The backlight module 1 of the second embodiment of the present invention continues to take the structure of the light guide plate 10 provided by the first embodiment of the present invention as an example, and uses the same component names and symbols.

Please refer to FIG. 2, which is a combined perspective view of the backlight module 1 of the second embodiment of the present invention. At least a portion of the light emitting element 20 is received in the light source receiving groove 12 of the light guide plate 10. In this embodiment, the light emitting element 20 includes at least one light source 21 and a substrate 22. The light source 21 can be, for example, a light emitting diode disposed on the substrate 22. The substrate 22 can be, for example, a printed circuit board having electrode contacts. Preferably, the light source 21 is disposed in the light source accommodating groove 12, and the substrate 22 is partially disposed outside the opening of the light source accommodating groove 12. According to a preferred embodiment of the present invention, the portion of the substrate 22 that is not provided with the light source 21 and the two outer sides of the light guide plate 10 on the left and right sides of the light source receiving groove 12 and one of the frame 40 The inner side surface is in close contact with each other, that is, both ends of the substrate 22 abut against the frame 40 and the light guide plate 10. Therefore, the light-emitting element 20 is fixed by being sandwiched between the left and right side surfaces of the light guide plate 10 and the inner side surface of the bezel 40. Then, the compressible element 30 is disposed on the other side of the light guide plate 10 with respect to the light source receiving groove 12. The frame 40 is configured to receive the light guide plate 10, the light-emitting element 20, and the compressible element 30, wherein the compressible element 30 abuts against the light guide plate 10 and the frame 40 for filling the light guide plate. 10 and the space between the frame 40 to fix the position of the light guide plate. The compressible member 30 can be used to provide a stress buffer compensation function, and the material thereof is mainly silicone or foam, but is not limited thereto.

Furthermore, the light guide plate 10 of the first embodiment has a structure mainly including a light guiding portion 11 and a light source receiving groove 12. The light guiding portion 11 is used for the incident light Uniform export can have a special microstructure design, but is not limited to this. The light source accommodating groove 12 is recessed on one side of the light guide plate, and is particularly concave on a side of the light guide plate for incident light. The light source receiving groove 12 has a light incident surface 12a and a plurality of side walls 12b. The space formed by the light incident surface 12a and the plurality of side walls 12b can be used to accommodate a light emitting element 20. Therefore, the light emitted by the light-emitting element can be incident on the light-guiding plate 1 from the light-incident surface 12a of the light-receiving groove 12 to the inside of the light guide plate 1. In addition, the light source accommodating groove 12 may be a long rectangle or a polygon, and the number of the plurality of side walls 12b may be two or four, but is not limited thereto, as long as the light source accommodating groove 12 can accommodate the light emitting element 20 can. The light source accommodating groove 12 has a depth such that the light emitting element 20 maintains a predetermined distance from the light incident surface 12a of the light source accommodating groove 12, and therefore, the depth needs to be at least slightly larger than the height of the light emitting element. Preferably, the preset distance can be obtained according to the thermal expansion coefficient calculation of the light guide plate 10, so as to prevent the light guide plate 10 from being thermally expanded and colliding with the light-emitting element due to the continuous operation of the light-emitting element. Therefore, the preset distance is It can be changed with the material of the light guide plate.

Please refer to FIGS. 3A and 3B for a partial enlarged view of a backlight module 1 according to a second embodiment of the present invention. The light guide plate 10 is disposed on the other side of the light source receiving groove 12 with the compressible member 30. The number of the compressible elements 30 is not limited, and may be 1, 2, 4 or 6, but is not limited thereto as long as the light guide plate 10 can be stably fixed. Alternatively, according to a preferred embodiment of the present invention, on the other side of the light guide plate 10 with respect to the light source accommodating groove 12, a notch capable of fitting the compressible member 30 is provided, as shown in FIG. 3A. . The gap of the light guide plate 10 can be strengthened by the buffering of the compressible element 30, so that the position of the light guide plate 10 in the backlight module is less susceptible to external forces. Of course, as shown in FIG. 3B, the light guide plate 10 may not be provided with an additional notch, and only the compressible member 30 abuts against the light guide plate 10 and the frame 40 to provide a function of buffering and fixing.

Compared with the prior art, the light guide plate and the backlight module provided by the present invention can realize the stable light guide plate and the light-emitting element by changing the shape of the light guide plate without changing the design of other components (such as a frame). Assembly increases the versatility of the frame, saving assembly and manufacturing costs. In addition, the assembly structure of the backlight module is relatively simple, and only the components are closely abutted to fix their positions, thereby indirectly reducing the manufacturing complexity (for example, fixing holes or screw holes). The invention not only can effectively improve the stability of the backlight module, but also achieve the purpose of protecting the light source and ensuring the quality of the light guide plate.

The present invention has been disclosed in its preferred embodiments, and is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

10‧‧‧Light guide plate

11‧‧‧Light Guide

12‧‧‧Light source receiving slot

12a‧‧‧Into the glossy

12b‧‧‧ sidewall

20‧‧‧Lighting elements

21‧‧‧Light source

22‧‧‧Substrate

Claims (10)

A light guide plate comprising: a light guiding portion; and a light source receiving groove recessed on one side of the light guide plate, having a light incident surface and a plurality of side walls; wherein the light source receiving groove is for receiving At least one light source of the light emitting element is disposed such that light of the light source is incident on the light incident surface from the light incident surface of the light source receiving groove. The light guide plate of claim 1, wherein the light-emitting element further comprises a substrate. The light guide plate of claim 1, wherein the light source is a light emitting diode. A backlight module includes: a light guide plate having a light guiding portion and a light source receiving groove, wherein the light source receiving groove is recessed on one side of the light guide plate, and has a light incident surface and a plurality of a light-emitting element having at least one light source, wherein the light source is received in the light source receiving groove of the light guide plate; and a compressible element is disposed on the light guide plate opposite to the light source receiving groove a side surface; and a frame for accommodating the light guide plate, the light emitting element and the compressible element, wherein the compressible element is in contact with the light guide plate and the frame. The backlight module of claim 4, wherein the light-emitting element further comprises a substrate, and the light source is disposed on the substrate. The backlight module of claim 5, wherein the substrate is sandwiched between two sides of the light guide plate on both sides of the light source receiving groove and an inner side surface of the frame. The backlight module of claim 4, wherein the light source is a light emitting diode. The backlight module of claim 4, wherein the compressible component is made of silicone or foam. The backlight module of claim 4, wherein the illumination source maintains a predetermined distance from the light incident surface of the light source receiving groove. The backlight module of claim 4, wherein the light guide plate has a plurality of notches on the other side opposite to the light source receiving groove for fitting the compressible member.