TWI631407B - Surface light source apparatus, edge-lit backlight module and display apparatus - Google Patents

Abstract

The invention relates to a surface light source device, which is provided with a light guiding column between the light source and the light guiding film to collect the light emitted by the light source and propagate to the light incident surface of the light guiding film and is designed by reducing the thickness of the light guiding column. It can make the light guiding film have a small thickness, so that the purpose of reducing the thickness of the conventional light guiding plate can be achieved. Furthermore, the surface light source device can be applied to a side-entry backlight module and a display device, and can also be applied to the field of illumination.

Description

Surface light source device, side-in backlight module and display device

The present invention relates to the field of light sources and display technologies, and in particular, to a surface light source device and an application thereof.

In the prior side-entry backlight module, the basic structure has a light guide plate and the volume and weight of the light guide plate occupy nearly 50% of the whole machine; if the space and weight occupied by the light guide plate can be reduced, the backlight mode is For groups, you can reduce costs. However, for a side-in backlight module, directly reducing the volume of the light guide means that light may leak out.

Accordingly, the present invention provides a surface light source device and an application thereof, which can achieve the purpose of reducing the thickness of the light guide plate while preventing light leakage.

Specifically, a surface light source device according to an embodiment of the present invention includes: a light source, a light guiding film, and a light guiding column. The light guiding film has a light incident surface and a second surface adjacent to the light incident surface, and the light guiding column is configured to collect light emitted by the light emitting source and propagate to the light entering the light guiding film The surface is emitted from the second surface after being converted into a surface light source by the light guiding film; the light guiding column has a first end and an opposite second end, and the light emitting source is disposed at the first end, The light guiding film is disposed at the second end, the light incident surface of the light guiding film faces the light guiding column, and the second end is tapered in a direction adjacent to the light guiding film.

In an embodiment of the invention, the first end is provided with a first groove, and the illumination source is inserted in the first groove and is an LED light bar.

In an embodiment of the invention, the second end is provided with a second recess, and one end of the light guiding film having the light incident surface is fixed in the second recess.

In an embodiment of the invention, the first end is provided with a first groove and the bottom of the first groove is provided with a first convex lens structure, the second end is provided with a second groove and the The bottom of the second recess is provided with a second convex lens structure, the convex surface of the first convex lens structure faces the light source, and the convex surface of the second convex lens structure faces the light incident surface of the light guiding film.

In an embodiment of the invention, the first end is tapered in a direction away from the light guiding film, and the light guiding column further comprises a connection between the first end and the second end. The intermediate portion and the intermediate portion are substantially rectangular.

In one embodiment of the invention, the light guiding film has a third surface opposite to the second surface and adjacent to the light incident surface, the first end being located at the light guiding film A side surface of one side of the second surface is a curved surface, and a side surface of the first end on a side of the third surface of the light guiding film is a flat surface.

In an embodiment of the invention, the illumination source is located on a focal plane of the first convex lens structure, and the light incident surface is located on a focal plane of the second convex lens structure.

In an embodiment of the present invention, a portion of the second surface of the light guiding film adjacent to the light incident surface is provided with a reflective material layer and a portion of the second surface away from the light incident surface is not A layer of reflective material is disposed such that the second surface is partially lighted.

In addition, a side-lit backlight module according to an embodiment of the present invention includes: an optical film set and any one of the foregoing surface light source devices; the second surface of the light guiding film of the surface light source device faces the An optical film set; the light guiding film of the surface light source device has a third surface opposite to the second surface and adjacent to the light incident surface, and a plurality of dots are disposed on the third surface .

In addition, a display device according to an embodiment of the present invention includes: a non-self-luminous display panel and any of the above-described side-entry backlight modules; the non-self-luminous display panel is located at the optical film group away from the light guide film One side.

As can be seen from the above, in the embodiment of the present invention, a light guide column is added between the light source and the light guide film to collect the light emitted by the light source and propagate to the light incident surface of the light guide film and is designed by gradually reducing the thickness of the light guide column. It can make the light guiding film have a small thickness, so that the purpose of reducing the thickness of the conventional light guiding plate can be achieved.

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims.

Referring to FIG. 1 , a side-lit backlight module 10 according to a first embodiment of the present invention includes an illumination source 11 , a light guide pillar 13 , a light guide film 15 , an optical film assembly 17 , and a reflection sheet 19 . The light source 11, the light guide column 13 and the light guiding film 15 together constitute a surface light source device, wherein the light guiding column 13 and the light guiding film 15 are separate members and can be assembled.

In view of the above, the light source 11 is, for example, an LED strip, which includes a long strip PCB and a plurality of LED lamps disposed on the PCB. Of course, the light source 11 may also include a long strip PCB board and a plurality of other point light sources disposed on the PCB board, or the light source 11 may be other line light sources.

The light guide column 13 has a first end 131 and an opposite second end 133. The first end 131 defines a recess 1311, and the illumination source 11 is inserted in the recess 1311. The second end 133 is connected to the first end 131 and is tapered in a direction adjacent to the light guiding film 15 (that is, the horizontal direction is rightward in FIG. 1), and the second end 133 is provided with a recess 1331, and the light guiding film 15 has One end of the light incident surface 151 is fixed in the recess 1331 and the light incident surface 151 is located in the recess 1331. It is worth mentioning that the number of the light guiding columns 13 may be two as shown in FIG. 1, and the light guiding film 15 is located between the two light guiding columns 13 and the opposite ends of the light guiding film 15 are respectively inserted into two. The second end 133 of the light guiding rod 13 is fixed in the groove 1331; of course, the number of the light guiding columns 13 may be one, or even two or more.

The light guiding film 15 has a light incident surface 151, a second surface 152 adjacent to the light incident surface 151, and a third surface 153 opposite to the light exit surface 152 and adjacent to the light incident surface 151. The light incident surface 151 faces the light guide column 13, and the second surface 152 faces the optical film group 17 and serves as a light exit surface. Preferably, the third surface 153 is provided with a plurality of dots 1531. The plurality of dots 1531 may be formed on the third surface 153 by etching, printing, attaching reflection points, etc., so that the light can be passed through the dots. 1531 is reflected to the second surface 152 of the light guiding film 15 to emit light, so as to enhance the uniformity of light.

The optical film group 17 is located on a side of the light guiding film 15 adjacent to the second surface 152, and includes, for example, a diffusion sheet 171, a brightness enhancement sheet 173 and 175, and a light shielding sheet 177 which are sequentially laminated on the second surface 152 of the light guide plate 15. And the light shielding sheet 177 includes a central light transmitting portion 177c and an edge light blocking portion 177e.

The reflective sheet 19 is located on the side of the light guiding film 15 adjacent to the third surface 153, which may be a metal sheet or other layer of reflective material.

In the first embodiment of the present invention, a light guide column 13 is added between the light source 11 and the light guide film 15, and the light emitted from the light source 11 is collected and propagated to the light incident surface 151 of the light guide film 15 to be converted by the light guide film 15. After the surface light source is emitted from the second surface 152, the thickness of the light guiding film 15 can be as low as 1 mm or less, even to 0.1-0.2 mm, which can greatly reduce the guide in the conventional liquid crystal display device while preventing light leakage. Light plate volume and weight can also reduce costs.

Referring to FIG. 2A and FIG. 2B, a surface light source device according to a second embodiment of the present invention includes an illumination source 21, a light guide column 23, and a light guide film 25. Wherein, the light guide column 23 and the light guiding film 25 are separate members and can be assembled together.

The light source 21 is, for example, an LED light strip comprising a long strip of PCB board and one or more LED lights disposed on the PCB board. Of course, the light source 21 may also be a long strip PCB board and one or more other point light sources disposed on the PCB board, or the light source 21 may be other line light sources.

The light guide post 23 has a first end 231, an opposite second end 233, and an intermediate portion 232 connected between the first end 231 and the second end 233. The first end 231 is tapered in a direction away from the light guiding film 25 (that is, to the left in the horizontal direction in FIG. 2A), and the side surface 2310 on both sides of the light guiding film 25 is preferably curved to achieve a better surface. The light convergence effect can of course be a plane. Furthermore, the first end 231 is provided with a groove 2311 and the bottom of the groove 2311 is provided with a convex lens structure 2313, and the convex surface of the convex lens structure 2313 faces the light source 21. The second end 233 is tapered in a direction adjacent to the light guiding film 25 (that is, the horizontal direction is rightward in FIG. 2A), the second end 233 is provided with a groove 2331, and the bottom of the groove 2331 is provided with a convex lens structure 2333, and The convex surface of the convex lens structure 2333 faces the light incident surface 251 of the light guiding film 25. It is worth mentioning here that since the first end 231 and the second end 233 of the light guiding rod 23 are both tapered in thickness, the intermediate portion 232 is designed to be substantially rectangular to facilitate the mounting of the light guiding rod 23.

The second surface 252 of the light guiding film 25 adjacent to the light incident surface 251 serves as a light emitting surface to provide a surface light source.

2B is a schematic view showing the optical path of the surface light source device of the embodiment. As shown in FIG. 2A and FIG. 2B, the light emitted from the light guide source 23 to the light source 21 is concentrated by the side surface 2310 of the first end 231 of the light guide column 23 and the convex lens structure 2313, and the convex lens structure 2333 of the second end 233 is used to converge. The light is further concentrated and incident on the light incident surface 251 of the light guiding film 25, so that the thickness of the light guiding film 25 can be greatly reduced while preventing light leakage. Preferably, in order to further improve the light coupling efficiency between the light guiding column 23 and the light guiding film 25, the light source 21 is disposed on the focal plane S1 of the convex lens structure 2313 and the light incident surface 251 of the light guiding film 25 is disposed on the convex lens. The focal plane S2 of structure 2333 (see Figure 2B).

Referring to FIG. 3, a surface light source device according to a third embodiment of the present invention includes an illumination source 31, a light guide column 33, and a light guide film 35. Wherein, the light guide column 33 and the light guiding film 35 are separate members and can be assembled together.

The light source 31 is, for example, an LED light bar that includes a long strip of PCB board and one or more LED lights disposed on the PCB board. Of course, the light source 31 may also be a long strip PCB board and one or more other point light sources disposed on the PCB board, or the light source 31 may be other line light sources.

The light guide post 33 has a first end 331, an opposite second end 333, and an intermediate portion 332 connected between the first end 331 and the second end 333. The first end 331 is tapered in a direction away from the light guiding film 35 (that is, the horizontal direction to the left in FIG. 3) and the side surface 3310 on the side of the second surface 352 of the light guiding film 35 is preferably a curved surface. In order to achieve a better optical convergence effect, it may of course be a plane; and the first end 331 is located on the opposite side of the second surface 352 of the light guiding film 35 (that is, the lower surface of the light guiding column 33 in FIG. 3). The plane may be a curved surface as long as the first end 331 has a tapered structure as a whole; the first end 331 is provided with a groove 3311 and the bottom of the groove 3311 is provided with a convex lens structure 3313, and the convex lens structure 3313 The convex surface faces the light source 31. The second end 333 is tapered in a direction adjacent to the light guiding film 35 (that is, the horizontal direction is rightward in FIG. 3), the second end 333 is provided with a recess 3331, and the bottom of the recess 3331 is provided with a convex lens structure 3333, and The convex surface of the convex lens structure 3333 faces the light incident surface 351 of the light guiding film 35. It is worth mentioning that, since the first end 331 and the second end 333 of the light guiding column 33 are both tapered in thickness, the intermediate portion 332 is designed to be substantially rectangular to facilitate the mounting of the light guiding column 33; The side surface of the first end 331 of the light guiding column 33 on the opposite side of the second surface 352 of the light guiding film 35 is also planar, which is more advantageous for the mounting and fixing of the light guiding rod 33.

The second surface 352 of the light guiding film 35 adjacent to the light incident surface 351 serves as a light emitting surface to provide a surface light source.

Referring to FIG. 4, it is a schematic diagram of application of a surface light source device according to a fourth embodiment of the present invention. As shown in FIG. 4, the light source 41 and the light guide 43 in the surface light source device of the present embodiment have the same structure as the light source 31 and the light guide 33 shown in FIG. 3, and thus will not be described herein. In addition, the light source 41 and the light guiding rod 43 of the present embodiment are disposed on the back surface 443 of the substrate 44, and the light guiding film 45 in the surface light source device is disposed at the second end of the light guiding rod 43 and is a flexible film. sheet.

In the above, the light incident surface 451 of the light guiding film 45 faces the light guiding column 43 , and the portion of the second surface 452 adjacent to the light incident surface 451 adjacent to the light incident surface 451 , that is, the second surface 452 is located on the substrate 44 . The portion of the back surface 443 and the side surface is provided with a reflective material layer 450, and the portion 452e of the second surface 452 remote from the light incident surface 451, that is, the portion 452e of the second surface 452 located at the front surface 441 of the substrate 44 is not provided with a reflective material layer. In this way, the second surface 452 is partially exposed to light. For example, the surface light source device composed of the light source 41, the light guide bar 43, and the light guide film 45 in the present embodiment is applied, for example, as a mirror headlight, and the substrate 44 is a mirror accordingly. In addition, it is worth mentioning that the surface 453 of the light guiding film 45 opposite to the second surface 452 and adjacent to the light incident surface 451 may also be provided with a reflective material layer over the entire surface.

Referring to FIG. 5, a display device 50 according to a fifth embodiment of the present invention includes a side-entry backlight module 501 and a non-self-luminous display panel 503. The side-lit backlight module 501 is used to provide backlight illumination to the non-self-luminous display panel 503; the non-self-luminous display panel 503 is, for example, a liquid crystal panel. Furthermore, the side-entry backlight module 501 of the embodiment can adopt the side-entry backlight module 10 shown in FIG. 1 , and the surface light source device can also be replaced with the surface light source device shown in FIG. 2A or FIG. 3 . .

In the above, in the present invention, the present invention has been disclosed in the above embodiments, and is not intended to limit the present invention, and it is within the spirit and scope of the present invention. The scope of protection of the present invention is defined by the scope of the appended claims.

11, 21, 31, 41‧ ‧ illumination source

13, 23, 33, 43‧‧ ‧ light guide

131, 231, 331‧‧‧ first end

133, 233, 333‧‧‧ second end

1331, 1331, 2311, 2331, 3311, 3331 ‧ ‧ grooves

15, 25, 35, 45‧‧‧ light guide film

151, 251, 351, 451‧‧‧ into the glossy surface

152, 252, 352, 452‧‧‧ second surface

153‧‧‧ third surface

1531‧‧‧ outlets

17‧‧‧Optical diaphragm group

171‧‧‧Diffuser

173, 175‧‧‧Enhanced film

177‧‧ ‧ shading film

177c‧‧‧Central Light Transmission Department

177e‧‧‧Edge shading

19‧‧‧reflector

2310, 3310‧‧‧ side surface

232, 332‧‧‧ middle part

2313, 2333, 3313, 3333‧‧‧ convex lens structure

S1, S2‧‧‧ focal plane

44‧‧‧Substrate

441‧‧‧ positive

443‧‧‧ back

450‧‧‧reflective material layer

Section 452e‧‧‧

453‧‧‧ surface

50‧‧‧ display device

501‧‧‧Side-in backlight module

503‧‧‧ Non-self-luminous display panel

FIG. 1 is a schematic structural view of a side-lit backlight module according to a first embodiment of the present invention. 2A is a schematic structural view of a surface light source device according to a second embodiment of the present invention. 2B is a schematic view showing an optical path of a surface light source device according to a second embodiment of the present invention. 3 is a schematic structural view of a surface light source device according to a third embodiment of the present invention. 4 is a schematic view showing the application of a surface light source device according to a fourth embodiment of the present invention. FIG. 5 is a schematic structural view of a display device according to a fifth embodiment of the present invention.

Claims (9)

A surface light source device comprising a light source; the improvement comprising: a light guiding film and a light guiding column; the light guiding film has a light incident surface and a second surface adjacent to the light incident surface, the light guiding column Collecting light emitted by the light source and propagating to the light incident surface of the light guiding film to be emitted from the second surface after being converted into a surface light source by the light guiding film; the light guiding column has a One end and an opposite second end, the light source is disposed at the first end, the light guiding film is disposed at the second end, and the light incident surface of the light guiding film faces the light guiding column The second end is tapered in a direction adjacent to the light guiding film; the second end is provided with a second groove, and the light guiding film has one end of the light incident surface fixed to the first end Inside the two grooves. The surface light source device of claim 1, wherein the first end is provided with a first groove, and the light source is inserted in the first groove and is an LED light bar. The surface light source device of claim 1, wherein the first end is provided with a first groove and the bottom of the first groove is provided with a first convex lens structure, and the bottom of the second groove A second convex lens structure is disposed, the convex surface of the first convex lens structure faces the light source, and the convex surface of the second convex lens structure faces the light incident surface of the light guiding film. The surface light source device of claim 3, wherein the first end is tapered in a direction away from the light guiding film, the light guiding column further comprising a first end and the An intermediate portion between the second ends and the intermediate portion is substantially rectangular. The surface light source device of claim 4, wherein the light guiding film has a third surface opposite to the second surface and adjacent to the light incident surface, the first end being located at the Light guiding film A side surface of one side of the second surface is a curved surface, and a side surface of the first end on a side of the third surface of the light guiding film is a flat surface. The surface light source device of claim 3, wherein the light source is located on a focal plane of the first convex lens structure, and the light incident surface is located on a focal plane of the second convex lens structure. The surface light source device of claim 1, wherein a portion of the second surface of the light guiding film adjacent to the light incident surface is provided with a reflective material layer and the second surface is away from the A portion of the light incident surface is not provided with a layer of reflective material such that the second surface partially emits light. A side-lit backlight module comprising: an optical film set and the surface light source device according to claim 1; the second surface of the light guiding film of the surface light source device faces the optical a diaphragm group; the light guiding film of the surface light source device has a third surface opposite to the second surface and adjacent to the light incident surface, and the third surface is provided with a plurality of dots. A display device comprising: a non-self-luminous display panel and the side-entry backlight module according to claim 8; the non-self-luminous display panel is located at a distance of the optical film group away from the light guiding film One side.