CN106932965B

CN106932965B - Optical diaphragm with lug design, optical diaphragm group and backlight module

Info

Publication number: CN106932965B
Application number: CN201710309130.7A
Authority: CN
Inventors: 林岳贤; 陈建民; 陈信利
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2017-02-23
Filing date: 2017-05-04
Publication date: 2020-07-17
Anticipated expiration: 2037-05-04
Also published as: TW201831966A; CN106932965A; TWI611245B

Abstract

The invention discloses an optical diaphragm with a lug design, an optical diaphragm group and a backlight module. The optical film comprises a film body with a first side edge and a lug; wherein the lugs have a higher light transmission than the diaphragm body. The connecting end of the lug overlaps the part of the diaphragm body close to the first side edge, and the protruding end of the lug protrudes from the first side edge and extends to the outer side of the diaphragm body.

Description

Optical diaphragm with lug design, optical diaphragm group and backlight module

Technical Field

The invention relates to an optical diaphragm, an optical diaphragm group and a backlight module. Specifically, the invention relates to an optical film with a lug structure, an optical film set and a backlight module.

Background

In recent years, with the rapid development of various electronic devices, the demand for display devices has been increasing. Among various display devices, liquid crystal display devices have been in an indispensable importance position in the entire application of electronic equipment because of their thinness, excellent display quality, and low power consumption.

In a liquid crystal display device, an optical film group, and a backlight module are generally provided in order to provide a light source and adjust optical characteristics. Therefore, the optical film and even the optical characteristics of the whole backlight module are improved, and the display quality and the use feeling of the whole liquid crystal display device can be improved accordingly.

In optical modules of various devices, such as backlight modules, the optical film may be secured by a lug-protruding design. However, such a lug design, which projects directly from the optical diaphragm, may cause a local dark band at the diaphragm side edge near the lug due to optical factors. The generation of local dark bands makes the overall brightness non-uniform, thereby deteriorating the display quality or optical characteristics of a device or apparatus including such an optical module. For example, a viewer or user may perceive a significantly darker area at the side edge when viewing such a device or apparatus, such as a television, thereby affecting the use experience including display quality.

To improve dark band defects near the lugs of the optical film, the lugs of the optical film may be trimmed. However, the trimming of the lug may not fix the optical film stably, and the optical film may jump from the predetermined position and be misaligned. A misaligned or unstably fixed optical film may abrade other adjacent optical films or even light guide plates, display units, polarizers, etc., and may generate wavy moire (P-Mura) on the entire optical film. As described above, the device or apparatus including such an optical module with the cut-out lug has deteriorated display quality, reduced reliability, and a shorter service life.

Disclosure of Invention

Means for solving the problems

The invention mainly aims to provide an optical film, an optical film group and a backlight module which have the advantages of improving the brightness uniformity of the film and having a lug structure capable of being positioned.

The optical film comprises a film body with a first side edge and a lug, wherein the lug is provided with a connecting end which is overlapped and attached to the part of the film body close to the first side edge and a protruding end which protrudes out of the first side edge. According to an embodiment of the present invention, the light transmittance of the bump is higher than that of the diaphragm body.

The optical film group comprises the optical film and an auxiliary optical film arranged in parallel with the optical film; the auxiliary optical film is provided with a second lateral edge which is parallel and corresponding to the first lateral edge and a lug part which integrally protrudes from the second lateral edge, and the vertical projection range of the lug part on the plane of the film body is at least partially overlapped with the lug.

The backlight module can comprise a backlight source, a rubber frame at least partially arranged along the periphery of the backlight source and any optical film. The glue frame comprises a side wall, a notch is formed in the side wall, the first side edge of the optical membrane is arranged opposite to the side wall, and the lug can be accommodated in the notch.

Efficacy against the prior art

According to various embodiments, the invention provides an optical film, an optical film group and a backlight module with a lug structure. Through the lug structure, the optical diaphragm group and the backlight module can improve the light transmission effect, for example, light is supplemented by guiding partial light through the lug, so that the optical local dark shadow is reduced, and the diaphragms in the diaphragm framework cannot be abraded mutually. Therefore, according to the embodiment of the invention, the optical film group and the backlight module which have better positioning performance, better optical uniformity and longer service life can be obtained.

Drawings

Fig. 1 is a schematic view of a position where a lug is provided on an optical film.

FIG. 2 is a schematic diagram of an optical film according to an embodiment of the invention.

Fig. 3 is a cross-sectional side view of the optical film shown in fig. 2.

FIG. 4 is a light path diagram of an optical film and a lug according to an embodiment of the invention.

FIG. 5 is a light path diagram of an optical film and a lug according to another embodiment of the invention.

FIG. 6 is a schematic view of the optical film mounted on the frame according to the embodiment of the invention shown in FIG. 2.

FIG. 7 is a schematic diagram of an optical film set according to an embodiment of the invention.

Fig. 8 is a schematic diagram of a backlight module according to an embodiment of the invention.

Fig. 9A to 9C are schematic views illustrating an optical film, an optical film set and a backlight module according to a first variation of the present invention.

Fig. 10A to 10D are schematic views illustrating an optical film, an optical film set and a backlight module according to a second variation embodiment of the invention.

Fig. 11A to 11C are schematic views illustrating an optical film, an optical film set and a backlight module according to a third variation embodiment of the invention.

Description of reference numerals:

l1, L2 length

10. 20, 30, 21, 22, 23: optical film

2: optical film group

1: backlight module

100. 300, and (2) 300: lug part

200. 210, 220, 230: convex lug

S1, S1': first side edge

S2: second side edge

40: adhesive material

501: gap

201: connecting end

202: projecting end

50: frame structure

505: rubber frame

203: diaphragm body

204: glue layer

502: side wall

70: light guide plate

205: first sheet

206: second sheet body

81: first inner side edge

82: second inner side edge

91: first outer side edge

92: second outside edge

207: first light guide strip

208: second light guide strip

1000: light ray

2000: back light source

3000: opening of the container

4000: slotted hole

Detailed Description

Various embodiments will be described hereinafter, and the spirit and principles of the invention will be readily understood by those skilled in the art by reference to the following description taken in conjunction with the accompanying drawings. However, while certain specific embodiments are specifically illustrated herein, these embodiments are merely exemplary and are not to be considered in all respects as limiting or exhaustive. Thus, it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and principles of the invention.

Among various display devices including liquid crystal display devices, an optical module, such as a backlight module, generally includes an optical film group composed of optical films. For example, the optical film set may be formed by a single optical film, or may include two or more optical films stacked on each other. And the optical Film may include a Brightness Enhancement Film (BEF), a prism sheet, a diffusion Film, a polarizing Film, or any other optical Film for various optical purposes. In addition, the backlight module may have only a single optical film according to the optical adjustment requirement.

According to one embodiment of the present invention, an optical film is disclosed. Referring to FIG. 1, an optical film 20 according to an embodiment of the present invention may be provided with lugs at different side edges, with possible locations of the lugs being shown as dashed circles. For example, lugs may be used at the first side edge S1 and the first side edge S1' of the optical film 20 according to the embodiment of the present invention. However, the present invention is not limited thereto, and the lugs of the present invention may be used for different side edges of the optical film 20, such as upper and lower side edges, and left and right side edges. Further, the number of lugs that may be provided with embodiments of the present invention is also not particularly limited. Hereinafter, for the sake of brevity, the description will be made mainly with respect to the first side edge S1 provided with the lug. In addition, the optical film may preferably be a Brightness Enhancement Film (BEF), but the present invention is not limited thereto.

Next, an optical film 20 according to an embodiment of the present invention is described with reference to fig. 2 and 3. The optical film 20 according to an embodiment of the present invention includes a film body 203 having a first side edge S1 and a lug 200. Here, the lug 200 is a single sheet body formed by sheet-shaped elements, however, the invention is not limited thereto, and the structure of the lug 200 can be variously changed, which will be described in further detail in other embodiments below.

According to the embodiment shown in fig. 2 and 3, the connecting end 201 of the lug 200 is preferably overlapped and attached to the portion of the diaphragm body 203 near the first side edge S1, and the protruding end 202 of the lug 200 protrudes beyond the first side edge S1. In this embodiment, the connecting end 201 preferably refers to the end edge of the overlapping area of the lug 200 and the diaphragm body 203 parallel to the first side edge S1, and the protruding end 202 preferably refers to the end edge of the lug 200 extending from the first side edge S1 parallel to the first side edge S1.

The light transmittance of the tab 200 is preferably higher than that of the diaphragm body 203. For example, the lug 200 is made of a transparent film. However, the invention is not limited thereto, and the convex lug may be a transparent film, a semi-transparent film, a non-transparent film with light-guiding property, or other films with different materials that vary according to the optical application. According to an embodiment of the invention, the lug is made of polyethylene terephthalate (PET) film. However, the present invention is not so limited and the sheet-like element can be made of any material while maintaining good light transmittance, or other particular desired optical properties. Therefore, light entering from the lower part or the side edge can be guided into the lug 200 by the transparent material or the light guide material, so that part of light is concentrated at the lug 200, the diaphragm body 203 close to the lug 200 can be complemented with light, and the generation of local dark bands of the diaphragm body 203 close to the side edge is reduced. This will be described in further detail below with reference to fig. 4 and 5.

Further, according to an embodiment of the present invention, the thickness of the lug 200 may be thinner than the thickness of the diaphragm body 203. However, the present invention is not limited thereto, and the thickness of the lug may be equal to, greater than, or less than the thickness of the diaphragm body as long as the lug can function to transmit or guide light.

The optical film 20 shown in fig. 2 and 3 may further include an adhesive layer 204 disposed between the connecting end 201 and the film body 203 for connecting the connecting end 201 and the film body 203. The glue layer 204 may be cut off from the first side edge S1 or separated from the first side edge S1 at the first side edge S1 of the optical film 20. According to the optical film 20 of the embodiment of the invention, the glue layer 204 may be white or transparent. The white or transparent adhesive layer allows the joint between the lug 200 and the film body 203 to transmit light and guide light, and even further diffuses light, so that the brightness of the side edge of the adhesive layer 204 can be further adjusted. However, the present invention is not limited thereto, and the adhesive layer may have various colors under the condition that the adhesive layer has good light transmittance or transmittance. In addition, although the adhesive layer 204 shown in fig. 2 and 3 is the adhesive layer 204 parallel to the first side edge S1, the adhesive layer 204 may be adhesive layers in various shapes or configurations as long as the connecting end 201 and the film body 203 can be attached. For example, the adhesive layer may be configured in a zigzag type, a wave type, a divided plurality of island type, or the like. Further, the adhesive layer 204 may cover the entire area of the connection end 201, three-quarters of the area of the connection end 201, one-half of the area of the connection end 201, and the like, according to the area of the connection end 201 where the lug 200 overlaps the diaphragm body 203.

The lug 200 of the optical film 20 shown in fig. 2 and 3 is designed in a trapezoidal configuration, and the length L1 of the protruding end 202 of the lug 200 is smaller than the length L2 of the connection end 201 of the lug 200 to the film body 203. in this case, the lug can be easily caught or inserted into the groove or the like without being freely moved due to the difference in length between the longer base and the shorter tip of the trapezoid of the lug, thereby enhancing the physical positioning or even fixing effect.

According to the optical film 20 disclosed above, the lugs 200 with different material properties have better light transmittance or light transmittance compared to the film body 203 of the optical film 20. Thus, referring to fig. 4, the ledge 200 may act as a micro-light guide to direct light 1000 from the side edge or below into the side edge of the film body 203 to complement the amount of light at the side edge of the optical film 20. In detail, the lug 200 with high transmittance or light transmittance allows the light 1000 to be "trapped" inside the lug, so that the light 1000 can be guided to the side edge of the film body 203 of the optical film 20. In the optical film 20 of the embodiment of the present invention, by such a lug design, the light introduced by the lug 200 disclosed in the embodiment of the present invention to supplement the light can approach the amount of light directly incident or reflected by the frame to enter the edge of the film body 203 of the optical film 20 without the lug. Overall, such optical compensation results in the elimination of the localized dark bands that may occur, with the side edges of the optical film 20 having and not having lugs exhibiting relatively close optical uniformity. A user will be less likely to perceive a dark area defect at the edge when viewing the display area, light emitting area or active area affected by the patch body 203 of the entire optical patch 20.

Although fig. 3 and 4 show the protrusion 200 disposed above the optical film 20, i.e., on the side facing the polarizer or the display unit. However, the invention is not limited thereto, and referring to another embodiment shown in fig. 5, the lug 200 may be disposed below the optical film 20, i.e., toward the side where the light guide plate or the backlight is incident. Similar to the embodiment shown in fig. 4, the light 1000 incident on the lug 200 from the edge or below can be guided by the lug 200 to the side edge of the diaphragm body 203 in the embodiment shown in fig. 5.

Referring to yet another embodiment of the present invention, an architecture is disclosed in which an optical film 20 is disposed in a frame. As shown in fig. 6, the protruding end 202 of the lug 200 can be disposed in a side edge notch 501 of the frame 50, such as a rubber frame 505. In detail, the optical film 20 may be disposed opposite to the rubber frame 505, and each frame body of the rubber frame 505 may extend along the side edge of the optical film 20, for example, the side edge of the optical film 20 may be disposed in parallel to each frame body of the adjacent rubber frame 505 or disposed at a certain interval, and each frame body of the rubber frame 505 may have a depressed notch 501 with a high and low head, so that the lug 200 may be disposed in the notch 501. The protruding end 202 of the lug 200 disposed in the notch 501 can be simply placed in the notch 501, and can be locked and limited with the sidewall of the notch 501 or further positioned in other manners such as covering and adhering through various adhesives. However, the present invention is not limited thereto, and the lug may be disposed at various suitable positions such as a groove of the frame, a gap between two frames, or a frame platform protruding in a height direction.

An optical film group according to another embodiment of the present invention will be described next with reference to fig. 7. It will be apparent to those skilled in the art that although the optical film stack shown in fig. 7 is disposed on the frame as shown in fig. 6, the present invention is not limited thereto. That is, the optical film set shown in fig. 7 can be disposed in other frames or architectures, and the illustration in fig. 7 is merely an example.

The optical film set 2 shown in fig. 7 includes three

optical films

10, 20, and 30; the

optical films

10, 20 and 30 may have the same or different optical tuning purposes and effects, respectively. However, this is merely an example, and the present invention is not limited thereto. The optical film 20 of the optical film group 2 of fig. 7 is an optical film using the lug 200. Another optical film 10 is disposed in parallel below the optical film 20, and another optical film 30 is disposed in parallel above the optical film 20. However, the present invention is not limited thereto, and the optical film group 2 may include only the optical film 10 below the optical film 20 or the optical film 30 above the optical film 20.

According to the optical film group 2 shown in fig. 7, the

optical films

10 and 30 have the second side edge S2 parallel to the first side edge S1 of the optical film 20 and the

lug portions

100 and 300 integrally protruding from the second side edge S2. The perpendicular projection range of the

respective ear portions

100 and 300 of the optical film 10 and the optical film 30 on the plane of the film body 203 of the optical film 20 at least partially overlaps the lug 200. Specifically, according to the optical film set 2 shown in fig. 7, the

lug portions

100 and 300 of the optical film 10 and the optical film 30 and the lug 200 of the optical film 20 are in a trapezoidal configuration partially overlapping each other, and the area of the lug portion 100 of the optical film 10 is larger than that of the lug 200 of the optical film 20, and the area of the lug portion 300 of the optical film 30 is smaller than that of the lug 200 of the optical film 20. That is, both ends of the lower lug or the lug part in the direction parallel to the side edge protrude beyond the upper lug or the lug part. Therefore, the lug part or the ear of all the optical films is in a partially uncovered state.

The optical film set 2 shown in fig. 7 may further comprise a sticker simultaneously attached to the surface of the lug and the lug facing the same direction. As mentioned above, according to the above-mentioned trapezoidal configuration which partially overlaps with each other, when, for example, covering a patch, all of the lug parts or lugs of the optical film sheets can be positioned by being stuck with the patch.

According to the above-disclosed optical film set 2, since the middle optical film 20 uses the above-mentioned lug 200, the optical film 20 can be more firmly positioned, and various defects such as wavy moire are less likely to be generated or reduced. Meanwhile, since the protrusion 200 has better light transmittance or light transmittance compared to the film body 203 of the optical film 20, light from the side edge or the lower side can be guided through the protrusion 200, thereby complementing the amount of light on the side edge of the optical film 20. Further, by introducing light into the edge, the light quantity and uniformity exhibited by the film body 203 of the overall optical film 20 are improved. The local dark bands generated by the light unevenness are eliminated or weakened, and the optical display characteristics of the display area, the light emitting area or the active area acted by the whole optical film are improved.

In addition, according to the optical film set 2 disclosed above, since the optical film 20 located in the middle is firmly positioned, the optical film 20 does not dislocate or jump, and further the

optical films

10 or 30 above or below the optical film 20 are worn away from each other. Therefore, the optical film set 2 with the lug 200 can reduce unnecessary wear and tear of the optical film therein, and the service life and quality of the whole optical film set 2 are improved. It is noted that the optical film group shown by fig. 7 is merely an example, and the optical film using the lug 200 may be the optical film 10, the optical film 20, the optical film 30, or any combination thereof.

A backlight module according to still another embodiment of the present invention will be described with reference to fig. 7 and 8. Fig. 8 is a side view of a backlight module including the optical film set shown in fig. 7. The backlight module shown in fig. 8 comprises the above-mentioned optical film set 2 with the lug 200, the adhesive material 40, the backlight source 2000, the light guide plate 70, and a frame 50, such as a plastic frame, at least partially disposed along the periphery of the light guide plate 70. By

The frame 50 of the backlight module shown in fig. 8 includes a sidewall 502, a notch 501 (see fig. 7) is formed on the sidewall 502, and the first side edge S1 and the second side edge S2 of the optical film 20 of the optical film set 2 are disposed opposite to the sidewall 502, and the lug 200 can be received in the notch 501. The adhesive material 40 covers the lug or the lug part of each optical film in the optical film group 2 in the notch 501 of the sidewall 502, fixes part or all of the optical films at one end close to the optical films, and the adhesive material 40 is additionally fixed on the frame 50 or other elements at the end of the sidewall 502 of the frame 50 opposite to the optical films. That is, the sticker 40 can adhere the lug or protruding ear portion of the optical film, the sidewall 502 of the frame 50, and the outer wall of the frame 50 opposite to the inner side where the optical film group is disposed, in sequence along the contour of the frame 50. However, the present invention is not limited thereto, and the sticker 40 may be attached in any manner as long as it can assist the positioning portion or all of the optical films. In addition, the sticker 40 can be, for example, a polyester film (Mylar), a tape, a fastener, or other various materials or elements that can be used to cover the positioning optical film. However, fig. 8 is only an example, and according to another embodiment of the present invention, the backlight module may not include a sticker covering a lug or a lug part for positioning the optical film.

According to the backlight module 1 shown in fig. 8, the backlight source 2000 generates light. Part of the light enters the lug 200 directly or indirectly and is guided by the lug 200 to a portion close to the first side edge S1. The light 1000 is introduced and the entire bright lug 200 complements the light with the optical film 20. The backlight module with the lug structure improves the light transmission effect, and the lugs 200 are positioned so that the diaphragms in the diaphragm framework cannot be abraded mutually. Therefore, the positioning performance is better, the optical uniformity is better and the service life is prolonged.

According to fig. 1 to 8, since the lug 200 made of a single sheet body formed by a sheet-like element is thinner and thinner, the optical film 20, the optical film set 2 and the backlight module 1 according to the embodiment of the invention have the advantage of thinner thickness. In general, it is helpful to make the device including the optical film 20, the optical film set 2 and the backlight module 1 light and thin. Meanwhile, the positioning and display quality of the optical film 20, the optical film set 2 and the backlight module 1 according to the embodiment of the invention can be improved by the lug 200.

Hereinafter, a plurality of modified embodiments will be explained with reference to fig. 9A to 11C. The descriptions overlapping with the above description are omitted for brevity, and the same reference numerals in fig. 9A to 11C denote the same elements as those described above, and will not be described again.

Modified example 1

Referring to fig. 9A to 9C, a variation 1 includes an optical film 21, an optical film group 2 including the optical film 21, and a backlight module 1 including the optical film 21.

Referring to fig. 9A and 9B, the lug 210 is composed of a first sheet 205 and a second sheet 206 disposed substantially parallel to each other, wherein the first sheet 205 and the second sheet 206 are formed by folding back the same sheet member at one end. However, the present invention is not limited thereto, and the first sheet and the second sheet may be formed by connecting two sheet-like elements at one side or both sides, or may be formed by connecting more than three sheet-like elements and folding them. Preferably, the sheet-like member may be a polyethylene terephthalate (PET) film or other light-transmissive film. In addition, the lug 210 shown in fig. 9A to 9C is a rectangular shape having the same length of the connection end 201 as that of the protrusion end 202. However, the present invention is not limited thereto, and the lug 210 may have a trapezoidal configuration similar to the above-described embodiment, or may be variously modified without being limited to this shape.

According to the variant 1 shown in fig. 9A to 9C, the end of the first blade 205 connected to the second blade 206 in reverse is the protruding end 202 of the lug 210, and the end opposite to the end connected to the reverse is the connecting end 201. Specifically, referring to fig. 9A, the lug 210 includes a first plate 205 having a first inner side edge 81 and a first outer side edge 91, and a second plate 206 having a second inner side edge 82 and a second outer side edge 92. The first outer side 91 and the second outer side 92 are connected to each other to form a protruding end 202; the first inner side edge 81 and the second inner side edge 82 together form the connecting end 201 and hold the portion of the film body 203 near the first side edge S1. The surface of the first inner side edge 81 and the second inner side edge 82, which sandwich the film body 203, is provided with a glue layer 204, and the first inner side edge 81 and the second inner side edge 82 can be adhered to the film body 203 through the glue layer 204.

Next, referring to fig. 9B, the optical film 21 of the variation 1 may be laminated on another auxiliary optical film 10, and accordingly, the lug 210 of the optical film 21 is partially overlapped on the lug part 100 of the auxiliary optical film 10. The optical film 21 and the auxiliary optical film 10 below may together constitute the optical film group 2.

Further, referring to fig. 9C, the backlight module 1 may include the optical film 21 and the optical film group 2 represented by fig. 9A and 9B. In addition, in the backlight module 1 shown in fig. 10C, the optical film set 2 may further include another auxiliary optical film 30 disposed on the optical film 21.

According to fig. 9A to 9C, since the protruding lug 210 made of a dual-sheet body formed by reversely folding a sheet-like element has a U-shaped cross section design and can cover the optical film 21 from top to bottom, the optical film 21, the optical film set 2 and the backlight module 1 have the advantages of better positioning and being not easy to fall off. Meanwhile, similar to the other embodiments described above, the positioning performance and the display quality of the optical film 21, the optical film set 2 and the backlight module 1 of the variation embodiment 1 can be improved by the lug 210.

Modified example 2

Referring to fig. 10A to 10D, a variation 2 includes an optical film 22, an optical film set 2 including the optical film 22, and a backlight module 1 including the optical film 22.

Referring to fig. 10A and 10B, the optical film 22 of the variation 2 uses the lug 220. The difference between the lug 220 and the lug 210 of the above-described modified embodiment 1 is the hollow design. Otherwise, the lug 220 of the modified embodiment 2 is substantially the same as the lug 210 of the modified embodiment 1, and the same description will be briefly described or will not be repeated.

Specifically, the lug 220 includes a first light guide strip 207 and a second light guide strip 208 of the first sheet 205 and the second sheet 206 respectively connected between the connecting end 201 and the protruding end 202. The first light guide bar 207 and the second light guide bar 208 of the first sheet 205, the first light guide bar 207 and the second light guide bar 208 of the second sheet 206, the connecting end 201 and the protruding end 202 together enclose an opening 3000. That is, according to the embodiment disclosed in fig. 10A to 10D, the lug 220 has a hollow design in the middle of its plane.

The above description with reference to fig. 10A to 10D is merely exemplary, and the hollow design may be varied in different ways. For example, the lug 220 may only include the first sheet 205, and the opening 3000 may be defined by the first light guide strip 207 and the second light guide strip 208 of the first sheet 205, the connection end 201, and the protrusion end 202.

In the modified embodiment 2 disclosed by fig. 10A to 10D, the length of the connection end 201 is equal to the length of the protruding end 202. By the configuration of such a hollow design, the amount and position of light to be introduced into the side edge of the optical film 22 can be adjusted. Further, the hollow design may be partially exposed under the lug 220. Thus, for example, the patch may preferably contact other structures under the lugs 220 when covered in place with the patch. In addition, the present invention is not limited thereto, and the length of the connection end 201 may be greater than the length of the protruding end 202 as described above with reference to other embodiments. That is, the length of the connection end 201 may be greater than the length of the protruding end 202 in a direction parallel to the first side edge S1. Thus, the trapezoidal configuration and the hollowed out design of the lugs further adjust the optical properties and enhance the physical positioning properties thereof as described above.

Although not shown in fig. 10A to 10D, according to other embodiments of the present invention, the opening 3000 of the lug 220 may further include an optical film surrounded by the first light guide bar 207, the second light guide bar 208, the connecting end 201 and the protruding end 202.

According to fig. 10A to 10D, since the hollow design is included, the optical film 22, the optical film set 2 and the backlight module 1 according to the variation embodiment 2 of the present invention have the advantages of good positioning and further adjusting the optical properties of the dual-layer PET film by covering the lug 220 of the optical film 22 up and down according to the U-shaped design. Therefore, the problem of local shadows is improved. Meanwhile, similar to the other embodiments described above, the positioning performance and the display quality of the optical film 22, the optical film set 2 and the backlight module 1 of the variation embodiment 2 can be improved by the lug 220.

Modified example 3

Referring to fig. 11A to 11C, a variation 3 includes an optical film 23, an optical film set 2 including the optical film 23, and a backlight module 1 including the optical film 23.

The greatest difference from the above-described embodiment or modified

embodiments

1 and 2 is that a part of the optical film 23 of modified embodiment 3, which is close to the first side edge S1, of the film body 203 is formed with a long groove hole 4000 parallel to the first side edge S1. However, the slot 4000 shown in fig. 11A to 11C is only an example, and the slot 4000 may be formed as a slot with various shapes such as a long strip slot, a circular slot, etc., and the slot 4000 of the diaphragm body 203 may also have an angle with the first side edge S1, for example, an angle smaller than 45 degrees, if necessary.

According to the modified embodiment 3 shown in fig. 11A to 11C, the lug 230 of the optical film 23 includes a first plate 205 having a first inner side edge 81 and a first outer side edge 91, and a second plate 206 having a second inner side edge 82 and a second outer side edge 92. In contrast to the variation 1, in the variation 3, the first inner side edge 81 and the second inner side edge 82 are connected to each other, or the first inner side edge 81 and the second inner side edge 82 are folded back from the same sheet-like member, so that the first inner side edge 81 and the second inner side edge 82 form the connection end 201 and pass through the slot 4000, and the first outer side edge 91 and the second outer side edge 92 can be connected by the glue layer 204 to form the protrusion end 202.

According to fig. 11A to 11C, since the protruding lug 230 made of a dual-sheet body formed by reversely folding a sheet-like element covers the optical film 23 up and down according to the U-shaped design, and the glue layer thickness is not formed at the position of the optical film 23 covering up and down, the optical film 23, the optical film set 2 and the backlight module 1 according to variation embodiment 3 of the present invention have advantages of better positioning performance, being not easy to fall off and maintaining thin shape. In general, it is helpful to make the device including the optical film 23, the optical film set 2 and the backlight module 1 of variation embodiment 3 thinner. Meanwhile, similar to the other embodiments described above, the positioning performance and the display quality of the optical film 23, the optical film set 2 and the backlight module 1 of the variation embodiment 3 can be improved by the lug 230.

Otherwise, the same descriptions of the modified embodiment 3 as those of the above embodiment will not be repeated.

The optical film, the optical film set and the backlight module of the various embodiments described in this specification improve defects that may cause local dark bands or even overall display quality in the optical module of various devices. Thus, the use experience of a viewer or user of such a device or apparatus is improved.

Further, the optical film group and the backlight module in the various embodiments described in this specification improve the positioning property of the optical film while improving the optical display characteristics, so that the optical film is less prone to dislocation or jumping. The more stably positioned optical films reduce wear between the optical films, eliminating or reducing the occurrence of wavy moire (P-Mura), resulting in improved display quality, increased reliability, and a longer useful life of a device or apparatus incorporating the lugs of the present invention.

It should be understood by those skilled in the art that the backlight module of the liquid crystal display device is basically used as an example, but the invention is not limited thereto. Therefore, the invention can also be applied to a backlight template of an organic light-emitting display device, a liquid crystal display device or other similar devices or other optical modules comprising optical films.

What has been described herein are merely some of the presently preferred embodiments of the invention. It should be noted that various changes and modifications can be made in the present invention without departing from the spirit and principle of the invention. It will be understood by those skilled in the art that the present invention is defined by the appended claims and that various changes in form, combination, modification and alteration may be made without departing from the scope of the invention as defined by the appended claims.

Claims

1. An optical film, comprising:

a diaphragm body having a first side edge; and

a lug having:

a connecting end which is overlapped and attached to the part of the membrane body close to the first side edge; and

a protruding end protruding outside the first side edge;

wherein the light transmittance of the lug is higher than that of the diaphragm body.

2. The optical film of claim 1, wherein the lug has a thickness that is thinner than a thickness of the film body.

3. The optical film of claim 1, wherein the lug is made of a transparent film.

4. The optical film as claimed in claim 1, further comprising a glue layer disposed between the connecting end and the film body for connecting the connecting end and the film body.

5. The optical film of claim 4, wherein the glue layer is white or transparent.

6. The optical film of claim 4, wherein the lug comprises:

a first sheet body having a first inner side edge and a first outer side edge; and

a second sheet body having a second inner side edge and a second outer side edge;

wherein the first outer side and the second outer side are connected to each other to form the protruding end; the first inner side edge and the second inner side edge jointly form the connecting end and clamp the part of the membrane body close to the first side edge.

7. The optical film as claimed in claim 6, wherein the first sheet and the second sheet are formed by folding the same sheet-like member.

8. The optical film as claimed in claim 1, wherein a portion of the film body near the first side edge is formed with a slot hole parallel to the first side edge; the lug includes:

wherein, the first inner side edge and the second inner side edge are connected with each other to form the connecting end and pass through the slotted hole; the first outer side edge and the second outer side edge are jointed through an adhesive layer to form the protruding end.

9. The optical film as claimed in claim 1, wherein the protruding lug comprises a first light guide strip and a second light guide strip respectively connected between the connecting end and the protruding end, and the first light guide strip, the second light guide strip, the connecting end and the protruding end together define an opening.

10. The optical film as claimed in claim 1, wherein the length of the connecting end is greater than the length of the protruding end.

11. An optical film set comprising:

the optical film of any one of claims 1 to 10; and

an auxiliary optical film disposed in parallel with the optical film, wherein the auxiliary optical film has:

a second side edge, which is arranged in parallel and corresponding to the first side edge; and

a lug portion integrally projected from the second side edge; wherein,

the vertical projection range of the lug part on the plane of the diaphragm body at least partially overlaps with the lug part.

12. The optical film assembly of claim 11, further comprising a bonding material attached to the surface of the lug and the lug facing in the same direction.

13. A backlight module comprises:

a backlight source;

a rubber frame, at least partially arranged along the periphery of the backlight source; wherein, the rubber frame comprises a side wall, and a gap is formed on the side wall; and

the optical film of any one of claims 1 to 10;

the first side edge is arranged opposite to the side wall, and the lug is accommodated in the notch.

14. The backlight module of claim 13, wherein the backlight source generates a light beam, and a portion of the light beam directly or indirectly enters the protrusion lug, so that the brightness of the protrusion lug is greater than the brightness of the portion of the film body near the first side edge.