WO2014154128A1

WO2014154128A1 - Light guide module

Info

Publication number: WO2014154128A1
Application number: PCT/CN2014/074020
Authority: WO
Inventors: Hong Li; Xinxin SONG
Original assignee: Shenzhen Byd Auto R&D Company Limited; Byd Company Limited
Priority date: 2013-03-27
Filing date: 2014-03-25
Publication date: 2014-10-02
Also published as: CN203202914U

Abstract

A light guide module includes: a light guide film (20); a light guide network structure disposed on a bottom surface (212) of the light guide film (20) to change a direction of light propagation within the light guide film (20);and a light source (10) disposed opposite to a side surface (213) of the light guide film (20);wherein the light guide network structure includes a first network structure (22) adjacent to the light source (10), and a second network structure (23) away from the light source (10), the light guide film (20) is transparent or semitransparent except for a part on which the light guide network structure is disposed.

Description

LIGHT GUIDE MODULE

FIELD

The present disclosure relates to a light guide module.

BACKGROUND

In the trend of ultra-thin and energy saving, a light guide module including a light guide film is adapted to be used as a backlight component in electronic products, such as mobile phone.

Usually, the light guide film has a thickness less than 0.35 mm, which is thinner than a thickness of a LED (Light Emitting Diode) light source. In order to improve a utilization efficiency of light, a light proof and reflective paper may be disposed on a top of the LED light source and a top of an entry end of the light guide film.

However, many light beams emitted from the light source is not entered into the light guide film directly; instead, these light beams may be emitted onto the light proof and reflective paper firstly, and then some of these light beams may be absorbed by the light proof and reflective paper, but the rest of these light beams may be reflected by the light proof and reflective paper and be transmitted into the light guide film. The light beams reflected by the light proof and reflective paper may be directly emitted out of the light guide film from areas of the light guide film adjacent to the light source. Therefore, the areas of the light guide film adjacent to the light source may be too bright, which causes a non-uniform light guiding of the light guide film.

SUMMARY OF THE DISCLOSURE

Embodiments of the present disclosure seek to solve at least one of the problems existing in the prior art to at least some extent, or to provide a consumer with a useful alternative.

Embodiments of the present disclosure provide a light guide module, which includes: a light guide film; a light guide network structure disposed on a bottom surface of the light guide film to change a direction of light propagation within the light guide film; and a light source disposed opposite to a side surface of the light guide film; wherein the light guide network structure includes a first network structure adjacent to the light source, and a second network structure away from the light source, the light guide film is transparent or semitransparent except for a part on which the light guide network structure is disposed. According to embodiments of the present disclosure, the first network structure is disposed in a marginal area of the bottom surface of the light guide film.

According to embodiments of the present disclosure, the first network structure includes a plurality of first network micro prisms, the second network structure includes a plurality of second network micro prisms, and a size of the first network micro prism is larger than that of the second network micro prism.

According to embodiments of the present disclosure, a density of the first network micro prisms is higher than that of the second network micro prisms.

According to embodiments of the present disclosure, each of the first and second network micro prisms is configured to have a semi-sphere shape, and a diameter of the first network micro prism is larger than that of the second network micro prism.

According to embodiments of the present disclosure, the diameter of the firs network micro prism is in a range from 40μπι to 85μπι.

According to embodiments of the present disclosure, the diameter of the second network micro prism is in a range from 40μπι to 85μπι.

According to embodiments of the present disclosure, the plurality of first network micro prisms are arranged into a pattern having a trapezoid shape, a rectangle shape or a polygon shape.

According to embodiments of the present disclosure, a distance between adjacent the first network micro prisms is in a range from 0.2 mm to 0.6 mm.

According to embodiments of the present disclosure, a distance between adjacent the second network micro prisms is in a range from 0.2 mm to 0.6 mm.

According to embodiments of the present disclosure, the first network micro prism has a half-circle shape, a triangle shape, an arch shape or a square shape.

According to embodiments of the present disclosure, a density of the second network micro prisms is increased in a direction away from the light source.

According to embodiments of the present disclosure, the light source includes a light emitting diode.

According to embodiments of the present disclosure, two light sources and two first network structures are provided, the two light sources are disposed opposite to the two side surfaces respectively, and the two first network structures are adjacent to the two light sources respectively.

According to embodiments of the present disclosure, the light guide module further includes a light proof component disposed on a top of the light source and extended over at least a part of the top surface of the light guide film. That is, the light proof component may be disposed on a top of the LED light source and a top of an entry end of the light guide film.

According to embodiments of the present disclosure, the light proof component includes a light proof paper.

With the light guide module according to the aforementioned embodiments, the first network structure and the second network structure are configured to change a light propagation direction within the light guide film. The light beams are multi-reflected and multi-refracted within the light guide film when entering into the first network structure, which causes a diffuse reflection effect of the light beams at an area of the first network structure. Therefore, the light beams uniformly emit out the light guide film, the problem that the areas of the light guide film adjacent to the light source is too bright can be avoided and the performance, such as uniformity of light guide, of the light guide module may be improved.

Additional aspects and advantages of embodiments of present disclosure will be given in the following descriptions, become apparent from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

BRIF DESCRIPTION OF THE DRAWINGS

These and other aspects and advantages of the present disclosure will become apparent and more readily appreciated from the following descriptions taken in conjunction with the drawing, in which:

Fig. 1 is a top view of a light guide module according to an embodiment of the present disclosure; and

Fig. 2 is a cross section view of a light guide module according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the present disclosure; samples of described embodiments are indicated in the drawings. The embodiments described herein with reference to drawings are explanatory, illustrative, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure. In the specification, unless specified or limited otherwise, relative terms such as "central", "longitudinal", "end", "front", "rear", "right", "left", "inner", "outer", "lower", "upper", "horizontal", "vertical", "above", "below", "up", "top", "bottom" as well as derivative thereof (e.g., "horizontally", "downwardly", "upwardly", etc.) should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not require that the present disclosure be constructed or operated in a particular orientation.

In addition, terms such as "first" and "second" are used herein for purposes of description and are not intended to indicate or imply relative importance or significance. Thus, the feature defined with "first" and "second" may comprise one or more this feature. In the description of the present disclosure, the term "a plurality of means two or more than two, unless specified otherwise.

The light guide module according to embodiments of the present disclosure will be described with reference to Fig. 1 and 2 below.

As shown in Fig. 1 and 2, a light guide module according to embodiments of the present disclosure includes a light source 10, a light guide film 20 and a light guide network structure.

The light guide film 20 has a top surface 211, a bottom surface 212 and a side surface 213. The light source 10 is arranged opposite to the side surface 213 of the light guide film 20. The light guide network structure is disposed on the bottom surface 212 of the light guide film 20 and configured to change a direction of light propagation within the light guide film20. The light guide film 20 is transparent or semitransparent except for a part on which the light guide network structure is disposed.

The light guide network structure comprises a first network structure 22 disposed in a marginal area of the bottom surface 212 of the light guide film 20 and adjacent to the light source 10, and a second network structure 23 disposed on the bottom surface 212 of the light guide film 20 and away from the light source 10.

In some embodiments, the light source may include a light emitting diode (LED). The light emitting diode may be a side-view light emitting diode which can emit light beam from one side thereof. That is, the side-view light emitting diode can emit light beams toward the side surface 213 of the light guide film 20 which faces to the emitting side of the side-view light emitting diode.

The light source 10 may include two light emitting diodes arranged opposite to two side surfaces 213 of the light guide film 20 respectively, and two first network structures 22 are disposed on two marginal areas of the bottom surface 212 and adjacent to the light emitting diodes respectively.

The light guide film 20 may have a thickness less than 0.35 mm and the light guide film 20 may be thinner than the LED light source 10.

In some embodiments, the first network structure 22 includes a plurality of first network micro prisms 220. In some embodiments, each of the first network micro prisms 220 is configured to have a semi-sphere shape, and a diameter of the first network micro prisms 220 is in a range from 40μπι to 85μπι.

A cross section of first network micro prisms 220 has a half-circle shape (as shown in Fig. 2), as the first network micro prisms 220 has the semi-sphere shape, but not limit to this, in some embodiments, the cross section of the first network micro prism 220 may also have a triangle shape, an arch shape or a square shape. A distance between adjacent the first network micro prisms is in a range from 0.2 mm to 0.6 mm.

In some embodiments, the second network structure 23 includes a plurality of second network micro prisms. In some embodiments, each of the second network micro prisms is configured to have a semi-sphere shape, and a diameter of the second network micro prisms is in a range from 40μπι to 85μπι. However, a size of the second network micro prisms is less than that of the first network micro prisms 220. A distance between adjacent the second network micro prisms is in a range from 0.2 to 0.6mm, and the density of the second network micro prisms is lower than that of the first network micro prisms 220.

As shown in Fig. 1, the density of the second network micro prisms is increased in a direction away from the light source 10.

In some embodiments, with a distance between the second network structure 23 and the light source 10 decreasing, a density of the second network structure 23 is decreasing.

With the light guide module according to embodiments of the present disclosure, the first network structure 22 and the second network structure 23 are configured to change a light propagation direction within the light guide film 20. Light beams are multi-reflected and multi-refracted by the first network structure 22 within the light guide film 20 when entering into the first network structure 22, which causes a diffuse reflection effect of the light beams at an area of the first network structure 22. The working principle of the second network structure 23 is similar to the firs network structure 22.

Thus, the light beams can uniformly emit out the light guide film 20, the problem that the areas of the light guide film 20 adjacent to the light source 10 is too bright can be avoided, and the performance, such as uniformity of light guide, of the light guide module can be improved.

In some embodiments, the plurality of first network micro prisms 220 are arranged into a pattern having a trapezoid shape, as shown in Fig. 1, but not limit to this, the first network micro prisms 220 may also be arranged into a pattern having a rectangle shape, a polygon shape or other shape. The arranging pattern of the first network micro prisms 220 may be designed based on the shape of the light source 10. The light guide module may have a better performance if the arranging pattern of the first network micro prisms 220 is similar to the shape of the light source 10.

In some embodiments, as shown in Fig. 2, the light guide module further includes a light proof component 30 disposed on a top of the light source 10 and extended over at least a part of the top surface 211 of the light guide film 20. That is, the light proof component may be disposed on top of the LED light source and top of an entry end of the light guide film. The light proof component 30 can absorb and reflect part of light beams emitting from the light source 10. Therefore, a utilization rate of the light source 10 may be improved. The light proof component 30 may include a light proof paper.

As shown in Fig. 2, if there is no first network structure 22 disposed on the bottom surface 212, the light beams are reflected by the light proof component 30 and enter into the light guide film, and then are reflected in the light guide film, finally, some of the light beans may emit out the light guide film 20 directly in an oblique direction, thus areas of the light guide film 20 adjacent to the light source 10 may be too bright.

However, if the first network structure 22 is disposed on the bottom surface of the light guide film 20 and adjacent the light source 10, propagation direction of those light beams reflected from the light proof component 30 may be changed, those light beams may be reflected back to the light proof component 30 by the first network structure 22, some of those light beams may be absorbed, other of those may be reflected by the light proof component 30 again, which causes a multiple reflection.

Thus the light beams directly emitting out the light guide film 20 in the oblique direction can be reduced. The brightness of areas of the light guide film 20 adjacent to the light source 10 can be weakened, and uniformity of light guide of the light guide module of the present disclosure can be improved. Those having ordinary skill in the art will appreciate that the propagate path of light beams emitting from the light source 10 shown in Fig. 2 is illustrative, which shall not be construed to limit the present disclosure.

With the light guide module according to the present disclose, light spot can be prevent from being emerged on the light guide film adjacent to the light source and he uniformity of light guide of the light guide module can be improved without adding any new component or changing structure of the light guide film. A black side part of the light proof component can be narrower to enhance the appearance of the light guide module.

Reference throughout this specification to "an embodiment," "some embodiments," "an embodiment", "another example," "an example," "a specific example," or "some examples," means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least an embodiment or example of the present disclosure. Thus, the appearances of the phrases such as "in some embodiments," "in an embodiment", "in an embodiment", "in another example," "in an example," "in a specific example," or "in some examples," in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

Although explanatory Examples have been shown and described, it would be appreciated by those skilled in the art that the above Examples cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the Examples without departing from spirit, principles and scope of the present disclosure.

Claims

What is claimed is:

1. A light guide module, comprising:

a light guide film;

a light guide network structure disposed on a bottom surface of the light guide film to change a direction of light propagation within the light guide film; and

a light source disposed opposite to a side surface of the light guide film;

wherein the light guide network structure comprises a first network structure adjacent to the light source, and a second network structure away from the light source, the light guide film is transparent or semitransparent except for a part on which the light guide network structure is disposed.

2. The light guide module of any one of claim 1, wherein the first network structure is disposed in a marginal area of the bottom surface of the light guide film.

3. The light guide module of claim 1 or 2, wherein the first network structure comprises a plurality of first network micro prisms, the second network structure comprises a plurality of second network micro prisms, and a size of the first network micro prism is larger than that of the second network micro prism.

4. The light guide module of claim 3, wherein a density of the first network micro prisms is higher than that of the second network micro prisms.

5. The light guide module of claim 3, wherein each of the first and second network micro prisms is configured to have a semi-sphere shape, and a diameter of the first network micro prism is larger than that of the second network micro prism.

6. The light guide module of claim 5, wherein the diameter of the firs network micro prism is in a range from 40μιη to 85μιη.

7. The light guide module of claim 5, wherein the diameter of the second network micro prism is in a range from 40μιη to 85μιη.

8. The light guide module of claims 3-7, wherein the plurality of first network micro prisms are arranged into a pattern having a trapezoid shape, a rectangle shape or a polygon shape.

9. The light guide module of any one of claims 3-7, wherein a distance between adjacent the first network micro prisms is in a range from 0.2 mm to 0.6 mm.

10. The light guide module of any one of claims 3-7, wherein a distance between adjacent the second network micro prisms is in a range from 0.2 mm to 0.6 mm.

11. The light guide module of claim 3, wherein a cross section of the first network micro prism has a half-circle shape, a triangle shape, an arch shape or a square shape.

12. The light guide module any one of claims 3-11, wherein a density of the second network micro prisms is increased in a direction away from the light source.

13. The light guide module of any one of claims 1-12, wherein the light source includes a light emitting diode.

14. The light guide module of any one of claims 1 to 13, wherein two light sources and two first network structures are provided, the two light sources are disposed opposite to the two side surfaces respectively, and the two first network structures are adjacent to the two light sources respectively.

15. The light guide module of any one of claims 1 to 14, further comprising a light proof component disposed on a top of the light source and extended over at least a part of the top surface of the light guide film.

16. The light guide module of claim 15, wherein the light proof component comprises proof paper.