TWI611245B - Optical film, optical film assembly and backlight module with lug design - Google Patents

Abstract

The invention discloses an optical film, an optical film group and a backlight module with a lug design. The optical film includes a film body having a first side edge and a lug; wherein the lug has a higher light transmittance than the film body. The connecting end of the lug overlaps the portion of the diaphragm body near 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 film, optical film group and backlight module with lug design

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

In recent years, with the vigorous development of various electronic devices, the demand for display devices has also increased. Among various display devices, liquid crystal display devices have occupied an indispensable and important position in the entire application of electronic equipment due to their thinness, excellent display quality, and low power consumption.

In a liquid crystal display device, in order to provide a light source and adjust optical characteristics, an optical film, an optical film group and a backlight module are generally provided. Therefore, improving the optical characteristics of the optical film, the optical film and even the entire backlight module can also improve the display quality and use experience of the entire liquid crystal display device.

In the optical module of various devices, for example, in the backlight module, the optical film may be fixed by the protruding design of the lug. However, such a lug design protruding directly from the optical film may cause local dark bands on the side edges of the film near the lug due to some optical factors. The generation of local dark bands makes the overall brightness uneven, thereby degrading the inclusion of such optical modules The display quality or optical characteristics of the device or equipment. For example, a viewer or user may perceive a significantly darker area on the side edge when watching such a device or device, such as a television, which may affect the user experience including display quality.

In order to improve the dark band defect near the lugs of the optical film, the lugs of the optical film can be cut off. However, cutting off some of the lugs may make the optical film unable to be stably fixed, and then the optical film may jump out of the preset position and be displaced. Misplaced or unstable fixed optical films may damage other adjacent optical films or even light guide plates, display units, polarizers, etc., and may cause wavy moire on the entire optical film (P -Mura). As mentioned above, the display quality of devices or equipment containing such lug-removed optical modules is degraded, the reliability is reduced, and the service life is shortened accordingly.

In order to solve the above problems, an embodiment of the present invention provides an optical film, an optical film group, and a backlight module with improved luminous uniformity of the film and a positionable lug structure.

The optical film includes a film body having a first side edge and a lug, wherein the lug has a connection end stacked and attached to a portion of the film body near the first side edge, and a protrusion protruding beyond the first side edge. end. According to an embodiment of the present invention, the light transmittance of the lugs is higher than that of the film body.

The optical film group includes the above-mentioned optical film and an auxiliary optical film disposed in parallel with the optical film: wherein the auxiliary optical film has a second side edge disposed correspondingly in parallel with the first side edge, and a second side edge provided from the second side edge. Lugs protruding from the body as a whole, and the lugs are located on the diaphragm body The vertical projection range on the plane overlaps at least part of the lug.

The backlight module may include a backlight source, a plastic frame disposed at least partially along the periphery of the backlight source, and any one of the above optical films. The plastic frame includes a side wall, a notch is formed on the side wall, and a first side edge of the optical film is disposed opposite to the side wall, and the lug can be accommodated in the notch.

According to various embodiments, the present invention is an optical film, an optical film group and a backlight module with a lug structure. With the above-mentioned lug structure, the optical film, the optical film group and the backlight module can improve the light transmission effect, for example, the lug guides part of the light to supplement the light, thereby reducing the optical local shadow and making the film The diaphragms in the structure will not wear each other. Therefore, according to the embodiment of the present invention, an optical film, an optical film group, and a backlight module with better positioning, better optical uniformity and increased service life can be obtained.

L1, L2‧‧‧ length

10, 20, 30, 21, 22, 23‧‧‧ optical film

2‧‧‧ Optical film set

1‧‧‧ backlight module

100, 300‧‧‧ lugs

200, 210, 220, 230‧‧‧ lugs

S1, S1’‧‧‧first side edge

S2‧‧‧Second side edge

40‧‧‧ Sticker

501‧‧‧ gap

201‧‧‧Connector

202‧‧‧ protruding end

50‧‧‧ frame

505‧‧‧plastic frame

203‧‧‧ diaphragm body

204‧‧‧ Adhesive layer

502‧‧‧ sidewall

70‧‧‧light guide

205‧‧‧The first body

206‧‧‧Second body

81‧‧‧first inside edge

82‧‧‧ second inside edge

91‧‧‧ the first outside edge

92‧‧‧ second outer edge

207‧‧‧First light guide

208‧‧‧Second light guide

1000‧‧‧ light

2000‧‧‧ backlight

3000‧‧‧ opening

4000‧‧‧ slot

FIG. 1 is a schematic diagram of a position where a lug is arranged on an optical film.

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

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

FIG. 6 is a schematic diagram of an optical film mounted on a frame according to another embodiment of the present invention.

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

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

9A to 9C are schematic diagrams of an optical film, an optical film group, and a backlight module according to a first modified embodiment of the present invention.

10A to 10C are schematic diagrams of an optical film, an optical film group, and a backlight module according to a second modified embodiment of the present invention.

11A to 11C are schematic diagrams of an optical film, an optical film group, and a backlight module according to a third modified embodiment of the present invention.

Various embodiments will be described below, and those with ordinary knowledge in the technical field can easily understand the spirit and principles of the present invention by referring to the description and the accompanying drawings. However, although some specific embodiments will be specifically described in the text, these embodiments are merely exemplary and are not to be considered in a limiting or exhaustive sense in all respects. Therefore, for those with ordinary knowledge in the technical field, various changes and modifications to the invention should be obvious and easily achievable without departing from the spirit and principles of the invention.

In various display devices including a liquid crystal display device, an optical module, such as a backlight module, generally includes an optical film group composed of an optical film. For example, the optical film group may be formed of a single optical film, and may also include two or more optical films laminated on each other. In addition, the optical film may include any one of a brightness enhancement film (BEF), a mask, a diffusion film, a polarizing film, or other optical films for various optical purposes. In addition, depending on the needs of optical adjustment, the backlight module may also have only a single optical film.

According to an embodiment of the present invention, an optical film is disclosed. Referring to FIG. 1, the optical film 20 according to the embodiment of the present invention may be provided with lugs at different side edges, and the possible setting points of the lugs are shown by virtual circles. For example, a lug 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 to this, and different side edges of the optical film 20 such as the upper and lower side edges, and the left and right side edges can use the lugs of the present invention. Further, the number of lugs that can be provided in the embodiment of the present invention is not particularly limited. In the following, for the sake of brevity, description will be given mainly by providing a lug for the first side edge S1. In addition, the optical film may 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 will be described with reference to FIGS. 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 piece body composed of sheet-like elements, but the present invention is not limited thereto, and the structure of the lug 200 can be variously changed, which will be further detailed in other embodiments below.

According to the embodiment shown in FIG. 2 and FIG. 3, the connecting end 201 of the lug 200 is preferably stacked and attached to a portion of the diaphragm body 203 near the first side edge S1, and the protruding end 202 of the lug 200 protrudes from the first Outside the side edge S1. In this embodiment, the connecting end 201 preferably refers to an end edge of the lug 200 and the diaphragm body 203 that is parallel to the first side edge S1, and the protruding end 202 is preferably the lug 200 from the first The end edge of the side edge S1 is parallel to the end edge of the first side edge S1.

The light transmittance of the lug 200 is better than that of the film body 203. For example, the lug 200 is made of a transparent film. However, the present invention is not limited thereto. For example, the lug may be a transparent film, a translucent film, a non-transparent film with light guiding properties, or other films made of different materials that vary according to optical applications. According to an embodiment of the present invention, the lug is made of polyethylene terephthalate. Made of formate (PET) film. However, the present invention is not limited thereto, and the sheet-like element may be made of any material while maintaining good light transmittance, light transmittance, or other specific desired optical properties. With this transparent material or light-guiding material, light entering from below or from the side edge can be introduced into the lug 200, so that part of the light is concentrated at the lug 200, which can supplement the light to the diaphragm body 203 near the lug 200 and reduce The generation of a local dark band of the diaphragm body 203 near the side edge. This will be further detailed below with reference to FIGS. 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 to this, and as long as the lugs can function to transmit or guide light, the thickness of the lugs may be equal to, larger or smaller than the thickness of the film body.

The optical film 20 shown in FIGS. 2 and 3 may further include an adhesive layer 204 distributed between the connection end 201 and the film body 203 to connect the connection end 201 and the film body 203. The adhesive layer 204 may be aligned with the first side edge S1 or separated from the first side edge S1 at a first side edge S1 of the optical film 20. According to the optical film 20 of the embodiment of the present invention, the adhesive layer 204 may be white or transparent. The white or transparent adhesive layer allows the lugs 200 and the film body 203 to adhere to each other to transmit and guide light, and further diffuses light, thereby further adjusting the brightness of the side edges of the adhesive layer 204. 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 light transmittance. In addition, although the adhesive layer 204 shown in FIG. 2 and FIG. 3 is the adhesive layer 204 parallel to the first side edge S1, as long as the connection end 201 and the diaphragm body 203 can be attached, the adhesive layer 204 may be Various shapes or configurations of glue layer. For example, the adhesive layer may be configured in a zigzag type, a wave type, a divided plural island type, or the like. Further, according to the area of the connecting end 201 where the lug 200 and the diaphragm body 203 overlap, the adhesive layer 204 can cover the area of the entire connecting end 201, three-quarters of the connecting end 201, and one-half of the connecting end 201. Area, etc.

The lugs 200 of the optical film 20 shown in FIGS. 2 and 3 are designed in a trapezoidal configuration. The length L1 of the protruding end 202 of the lug 200 is less than the length L2 of the connecting end 201 of the lug 200 and the diaphragm body 203. . In this case, due to the length difference between the longer base and the shorter top of the trapezoid of the lug, the lug can be easily jammed or embedded in the design of the groove without moving freely, thereby strengthening physical positioning or even fixing. Role. In addition, the size and shape of the lugs can also be adjusted according to the expected amount of light to be complemented. That is, for example, if the amount of light introduced is too strong when the lug is a parallel regular rectangle protruding from the optical film, the shape of the lug can be trapezoidal to reduce the amount of light. However, the present invention is not limited to this, and the length of the connecting end 201 of the lug and the length of the protruding end 202 may be the same, or the lug may be designed in various suitable sizes or shapes, such as a rectangular shape, an oval shape, a mesh shape, Various shapes such as triangle and trapezoid.

According to the optical film 20 disclosed above, compared to the film body 203 of the optical film 20, the lugs 200 having different material properties have better light transmittance or light transmittance. Therefore, referring to FIG. 4, the lug 200 may function as a micro light guide plate, and guide the light 1000 from the side edge or below to the side edge of the film body 203, thereby complementing the amount of light at the side edge of the optical film 20. In detail, the lug 200 with a higher light transmittance or light transmittance causes 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, with such a lug design, the light introduced by the lug 200 disclosed in the embodiment of the present invention can be directly incident or reflected by the frame when there is no lug. The amount of light entering the edge of the film body 203 of the optical film 20. In general, such an optical complementing effect makes local dark bands that may appear to be eliminated, and the side edges of the optical film 20 with and without the lugs show relatively close optical uniformity. When the user inspects the display area, light emitting area, or active area acted by the film body 203 of the entire optical film 20, it will be difficult to feel the edges. Dark area defects.

Although FIGS. 3 and 4 show that the lug 200 is disposed above the optical film 20, that is, the side facing the polarizer or the display unit. However, the present invention is not limited to this, and referring to another embodiment shown in FIG. 5, the lug 200 may be disposed below the optical film 20, that is, the side facing the light guide plate or the backlight source. The embodiment shown in FIG. 5 is similar to the embodiment shown in FIG. 4, and 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.

Referring to still another embodiment of the present invention, a framework for disposing an optical film 20 in a frame is disclosed. As shown in FIG. 6, the protruding end 202 of the lug 200 may be disposed on a side edge notch 501 of a frame 50 such as a plastic 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 of the optical film 20, for example, the side of the optical film 20 may be disposed in parallel next to or adjacent to the rubber frame 505. Each frame body of the adjacent plastic frame 505 is spaced at a certain distance from each other, and each frame body of the plastic frame 505 may have a recessed notch 501 with a height difference, 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 may be simply placed in the notch 501 and positioned by engaging the stopper with the side wall of the notch 501 or by other means such as covering and pasting with various stickers. However, the present invention is not limited to this, and the lugs may be provided at various applicable positions such as a groove of a frame, a gap between two frames, or a frame platform protruding in a height direction.

Next, an optical film set according to another embodiment of the present invention will be described with reference to FIG. 7. It should be clear to those having ordinary knowledge in the art that although the optical film group shown in FIG. 7 is provided on the frame shown in FIG. 6, the present invention is not limited thereto. That is, the optical film set shown in FIG. 7 may be disposed in other frames or structures, and the illustration in FIG. 7 is merely an example.

The optical film group 2 shown in FIG. 7 includes three optical films 10, 20, and 30; The learning films 10, 20, and 30 may have the same or different optical adjustment purposes and effects, respectively. However, this is only 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 a 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 to this, 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 film 10 and the optical film 30 have a second side edge S2 and a second side edge S2 arranged in parallel with the first side edge S1 of the optical film 20. The lug portions 100 and 300 projecting out integrally. The vertical projection ranges of the respective lug portions 100 and 300 of the optical film 10 and the optical film 30 on the plane where the film body 203 of the optical film 20 is located overlap at least a part of the lug 200. Specifically, according to the optical film group 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. 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 portion in the direction of the parallel side edge protrude beyond the upper lug or the lug portion. Therefore, the lugs or lugs of all optical films are partially uncovered.

The optical film group 2 shown in FIG. 7 may further include a sticker on the surfaces of the lugs and the lug portions facing in the same direction. As mentioned above, according to the above-mentioned trapezoidal configuration that partially overlaps each other, for example, when covering a sticker, all the lugs or lugs of all optical films can be stuck and positioned by the sticker.

According to the optical film group 2 disclosed above, since the optical film 20 located in the middle uses the lugs 200 described above, the optical film 20 can be positioned relatively stably and the wavy clouds Various defects such as lines are less likely to occur or be reduced. At the same time, since the lug 200 has better light transmittance or light transmittance than the diaphragm body 203 of the optical diaphragm 20, the light from the side edge or below can be introduced through the lug 200, thereby complementing The amount of light at the side edge of the optical film 20. Furthermore, by introducing light at the edges, the amount of light and uniformity presented by the film body 203 of the overall optical film 20 are improved. Because the local dark band caused by uneven light is eliminated or weakened, the optical display characteristics of the display area, light emitting area, or active area affected by the entire optical film are also improved.

In addition, according to the above-disclosed optical film group 2, since the optical film 20 located in the middle is firmly positioned, the optical film 20 will not be misaligned or detached, and will wear on or under each other. Optical film 10 or 30. Therefore, the optical film group 2 with the lugs 200 can reduce unnecessary wear and tear of the optical film therein, and the life and quality of the overall optical film group 2 are thereby improved. It should be noted that the optical film group shown in FIG. 7 is only 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.

Next, a backlight module according to still another embodiment of the present invention will be described with reference to FIGS. 7 and 8. 8 is a side view of a backlight module including the optical film group shown in FIG. 7. The backlight module shown in FIG. 8 includes the optical film group 2 with the lug 200 described above, the sticker 40, the backlight 2000, the light guide plate 70, and a frame disposed at least partially around the light guide plate 70. 50, such as plastic frame. The frame 50 in the backlight module shown in FIG. 8 includes a side wall 502, a notch 501 is formed in the side wall 502 (see FIG. 7), and the first side edge S1 and the second side of the optical film 20 of the optical film group 2 The side edge S2 is disposed opposite to the side wall 502, and the lug 200 can be received in the notch 501. The sticker 40 covers the lugs or lugs of the optical films in the optical film group 2 in the notch 501 of the side wall 502, and fixes part or all of the optical films near one end of the optical film, and the sticker 40 is opposite to the side wall 502 of the frame 50 The optical film is fixed to the frame 50 or other components downwardly at one end. That is, the sticker 40 may sequentially stick the lugs or lugs of the optical film along the outline of the frame 50, the side wall 502 of the frame 50, and the outer wall of the frame 50 opposite to the inside of the optical film set. However, the present invention is not limited to this, and as long as it can assist in positioning part or all of the optical film, the sticker 40 can be stuck in any way. In addition, for example, the sticker 40 may be various materials or components that can be used to cover and locate the optical film, such as Mylar, tape, and fixing members. However, FIG. 8 is only an example, and according to another embodiment of the present invention, the backlight module may not include a lug or a lug portion of the optical film covered by the paste.

According to the backlight module 1 shown in FIG. 8, the backlight 2000 generates light. A portion of the light directly or indirectly enters the lug 200 and is guided by the lug 200 to a portion near the first side edge S1. The luminous lumen 200 which is lighted up by the introduction of light 1000 allows the optical film 20 to complement the light. The backlight module with the above-mentioned lug structure improves the effect of light transmission, and the positioning of the lugs 200 prevents the films in the film structure from abrading each other. Therefore, the positioning is better, the optical uniformity is better, and the service life is increased.

According to FIGS. 1 to 8, since the lugs 200 made of a single piece of sheet-shaped element are relatively thin, the optical film 20, the optical film group 2 and the backlight module according to the embodiment of the present invention 1 has the advantage of thinner thickness. Overall, it contributes to reducing the weight of devices including the optical film 20, the optical film group 2 and the backlight module 1. At the same time, with the lugs 200, the positioning and display quality of the optical film 20, the optical film group 2 and the backlight module 1 according to the embodiment of the present invention can be improved.

Hereinafter, several modified embodiments will be described with reference to FIGS. 9A to 11C. The descriptions overlapping with the above description will be omitted for the sake of brevity, and the same component symbols in FIGS. 9A to 11C represent the same components as described above, and will not be repeated here.

Variation Example 1

Referring to FIGS. 9A to 9C, a modified embodiment 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 FIG. 9B, the lug 210 is composed of a first sheet body 205 and a second sheet body 206 disposed substantially in parallel with each other, wherein the first sheet body 205 and the second sheet body 206 are folded back at one end by the same sheet element And formed. However, the present invention is not limited to this, and the first sheet body and the second sheet body can also be formed by two pieces of sheet-shaped elements being connected on one or both sides, or can also be reversed by three or more pieces of sheet-shaped elements being connected. Folded into shape. Preferably, the sheet-shaped element may be a polyethylene terephthalate (PET) film or other light-transmittable film. In addition, the lug 210 shown in FIGS. 9A to 9C is a rectangle with a length of the connecting end 201 equal to that of the protruding end 202. However, the present invention is not limited to this, and the lug 210 may have a trapezoidal configuration similar to the above-mentioned embodiment, or may be variously modified without being limited to this shape.

According to the modified embodiment 1 shown in FIG. 9A to FIG. 9C, one end of the first sheet body 205 and the second sheet body 206 is a protruding end 202 of the lug 210, and the other end is opposite to the one end which is connected to the reverse folding. Its connection end 201. Specifically, referring to FIG. 9A, the lug 210 includes a first sheet body 205 having a first inner side 81 and a first outer side 91, and a first piece 205 having a second inner side 82 and a second outer side 92.二 片 体 206。 Two pieces of body 206. 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 81 and the second inner side 82 can form a connection end 201 together, and hold the diaphragm body 203 close to Part of the first side edge S1. The first inner side 81 and the second inner side 82 sandwich the film body 203 on the surface thereof with an adhesive layer 204. With the adhesive layer 204, the first inner side 81 and the second inner side 82 can be adhered.于 膜片 体 203。 In the film body 203.

Next, referring to FIG. 9B, the optical film 21 of Variation 1 may be laminated on another auxiliary optical film 10, and correspondingly, the lugs 210 of the optical film 21 are partially covered and overlapped with light. The ear portion 100 of the learning film 10 is on. The optical film 21 and the lower optical film 10 may form an optical film group 2 together.

Further, referring to FIG. 9C, the backlight module 1 may include an optical film 21 and an optical film group 2 shown in FIGS. 9A and 9B. In addition, in the backlight module 1 shown in FIG. 10C, the optical film group 2 may further include another optical film 30 provided on the optical film 21.

According to FIGS. 9A to 9C, since the lug 210 made of a two-piece sheet body composed of a one-piece element folded back has a U-shaped cross-section design and can cover the optical film 21 from above and below, the optical film 21. The optical film group 2 and the backlight module 1 have the advantages of better positioning and not falling off easily. At the same time, similar to the other embodiments described above, by using the lug 210, the positioning and display quality of the optical film 21, the optical film group 2 and the backlight module 1 of Example 1 can be improved.

Variation 2

Referring to FIG. 10A to FIG. 10C, a modified embodiment 2 includes an optical film 22, an optical film group 2 including the optical film 22, and a backlight module 1 including the optical film 22.

Referring to FIGS. 10A and 10B, a lug 220 is used for the optical film 22 of the second embodiment. The difference between the lug 220 and the lug 210 of the above-mentioned modified embodiment 1 lies in the hollow design. In addition, the lugs 220 of the modified embodiment 2 and the lugs 210 of the modified embodiment 1 are substantially the same, and the same description will be briefly described or omitted. .

Specifically, the lug 220 includes a first light guide bar 207 and a second light guide bar 208 of the first sheet body 205 and the second sheet body 206 respectively connected between the connection end 201 and the protruding end 202. The first light guide bar 207 and the second light guide bar 208 of the first sheet body 205, the first light guide bar 207 and the second light guide bar 208 of the second sheet body 206, and the connection end 201 and the protruding end 202 are enclosed together. One opening 3000. That is, according to the embodiment disclosed in FIGS. 10A to 10C, the lug 220 has a hollow structure in the middle of its plane. meter.

The above description with reference to FIG. 10A to FIG. 10C is merely exemplary, and the hollow design may have different design changes. For example, the lug 220 may include only the first sheet body 205, and the opening 3000 may be surrounded by the first light guide bar 207 and the second light guide bar 208, the connection end 201, and the protruding end 202 of the first sheet body 205.

In a modified embodiment 2 disclosed in FIGS. 10A to 10C, the length of the connecting end 201 is equal to the length of the protruding end 202. With the framework of such a hollow design, the amount and position of light expected to be introduced into the side edges of the optical film 22 can be adjusted. Further, the hollow design may be partially exposed to the structure under the lug 220. Therefore, for example, when covering and positioning with a sticker, the sticker can better contact other structures under the lug 220. In addition, the present invention is not limited to this. Referring to other embodiments above, the length of the connecting end 201 may also be greater than the length of the protruding end 202. That is, the length of the connecting end 201 may be greater than the length of the protruding end 202 in a direction parallel to the first side edge S1. In this way, according to the above description, the lugs of the trapezoidal configuration and the hollow design can further adjust its optical properties and strengthen its physical positioning properties.

Although not shown in FIGS. 10A to 10C, according to other embodiments of the present invention, the opening 3000 of the lug 220 may further include a first light guide bar 207, a second light guide bar 208, a connection end 201, and a protrusion. The optical film enclosed by the end 202.

According to FIG. 10A to FIG. 10C, since the hollow design is included, the optical film 22, the optical film group 2 and The backlight module 1 has the advantages of good positioning and further adjustment of the optical properties of the double-layer PET film. Therefore, the problem of local shadows is improved. Meanwhile, similar to the other embodiments described above, the optical film 22 and the optical film group 2 of the embodiment 2 are changed by the lugs 220. And the positioning and display quality of the backlight module 1 can be improved.

Variation 3

Referring to FIGS. 11A to 11C, a modified embodiment 3 includes an optical film 23, an optical film group 2 including the optical film 23, and a backlight module 1 including the optical film 23.

The biggest difference from the above embodiment or the modified embodiments 1 and 2 is that the film body 203 of the optical diaphragm 23 of the modified embodiment 3 is formed with a long groove parallel to the first side edge S1 at a portion close to the first side edge S1. Hole 4000. However, FIG. 11A to FIG. 11C are merely examples, and the slot hole 4000 may be formed as a slot hole of various shapes such as a long slot hole, a circular slot hole, and the slot hole 4000 of the diaphragm body 203 may also be connected with the slot body 4000 if necessary. The first side edge S1 has an angle, for example, an angle smaller than 45 degrees.

According to a modified embodiment 3 shown in FIGS. 11A to 11C, the lug 230 of the optical film 23 includes a first sheet body 205 having a first inner side 81 and a first outer side 91; and a second inner side The second sheet body 206 of the side 82 and the second outer side 92. In contrast to the modified embodiment 1, the first inner side 81 and the second inner side 82 according to the modified embodiment 3 are connected to each other, or the first inner side 81 and the second inner side 82 are the same piece. Where the shaped element is folded back, the first inner side 81 and the second inner side 82 form a connection end 201 and pass through the slot 4000, and the first outer side 91 and the second outer side 92 can be glued. The layers 204 are bonded to form a protruding end 202.

According to FIG. 11A to FIG. 11C, since the lug 230 made of a two-piece sheet body constituted by a one-piece element is folded back, the optical film 23 is covered up and down according to the U-shaped design, and the optical film 23 is covered up and down. There is no adhesive layer thickness everywhere. According to the variation 3 of the present invention, the optical film 23, the optical film group 2 and the backlight module 1 have the advantages of better positioning, not easy to fall off, and maintaining thinness. Overall, it contributes to reducing the thickness of the device including the optical film 23, the optical film group 2 and the backlight module 1 of the third embodiment. Meanwhile, similar to the other embodiments described above, with the lug 230, The positioning and display quality of the optical film 23, the optical film group 2 and the backlight module 1 of the modified embodiment 3 can be improved.

Except that, the description of the third embodiment that is the same as the above embodiment will not be repeated.

The optical film, the optical film group and the backlight module of the various embodiments described in this specification improve the defects that may cause local dark bands or even the overall display quality in the optical module of various devices. As a result, the experience of viewers or users of such devices or equipment is improved.

Further, the optical film, optical film group, and backlight module of the various embodiments described in this specification improve the positioning of the optical film under the improvement of the optical display characteristics, making the optical film less prone to misalignment or jumping. Take off. The relatively stable positioning of the optical film reduces the wear between the optical films, removes or reduces the occurrence of wavy moire (P-Mura), and improves the display quality and reliability of the device or device including the lugs of the present invention. , And the service life will be extended accordingly.

Those with ordinary knowledge in the technical field should understand that although the backlight module of a liquid crystal display device is basically taken as an example in this article, the present invention is not limited thereto. Therefore, the present 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 including an optical film.

What is described herein are only some preferred embodiments of the present invention. It should be noted that various changes and modifications can be made to the present invention without departing from the spirit and principles of the present invention. Those with ordinary knowledge in the technical field should understand that the present invention is defined by the scope of the attached application patents, and that all possible substitutions, combinations, modifications, and diversions are within the scope of the present invention within the meaning of the present invention. The scope defined by the scope of the attached patent application.

L1, L2‧‧‧ length

20‧‧‧Optical diaphragm

200‧‧‧ lugs

S1‧‧‧First side edge

201‧‧‧Connector

202‧‧‧ protruding end

203‧‧‧ diaphragm body

204‧‧‧ Adhesive layer

Claims (14)

An optical film includes: a film body having a first side edge; and a lug having: a connecting end that is cascaded and attached to a portion of the film body near the first side edge; and The protruding end protrudes beyond the first side edge; wherein the light penetrability of the lug is higher than that of the diaphragm body. The optical film according to claim 1, wherein the thickness of the lug is thinner than the thickness of the film body. The optical film according to claim 1, wherein the lug is made of a transparent film. The optical film according to claim 1, further comprising an adhesive layer distributed between the connection end and the film body to connect the connection end and the film body. The optical film according to claim 4, wherein the adhesive layer is white or transparent. The optical film according to claim 4, wherein the lug comprises: a first sheet body having a first inner side and a first outer side; and a second sheet body having a second inner side A side edge and a second outside edge; wherein the first outside edge and the second outside edge are connected to each other to form the protruding end; the first inside edge and the second inside edge are jointly formed The connecting end clamps a portion of the diaphragm body near the first side edge. The optical film according to claim 6, wherein the first sheet body and the second sheet system are formed by folding back the same sheet element. The optical film according to claim 1, wherein a part of the film body near the first side edge is shaped A slot is formed parallel to the first side edge; the lug includes: a first sheet body having a first inner side and a first outer side; and a second sheet body having a second An inner side and a second outer side; wherein the first inner side and the second inner side are connected to each other to form the connection end and pass through the slot; the first outer side and the first side The two outer edges are joined by an adhesive layer to form the protruding end. The optical film according to claim 1, wherein the lug comprises a first light guide bar and a second light guide bar respectively connected between the connecting end and the protruding end, and the first light guide bar, the The second light guide bar, the connecting end and the protruding end together form an opening. The optical film according to claim 1, wherein the length of the connecting end is greater than the length of the protruding end. An optical film group, comprising: the optical film according to any one of claim 1 to claim 10; and an auxiliary optical film disposed in parallel with the optical film, wherein the auxiliary optical film has: The second side edge is disposed in parallel corresponding to the first side edge; and a lug portion protrudes integrally from the second side edge; wherein the lug portion is vertically projected on the plane where the diaphragm body is located The range at least partially overlaps the lug. The optical film set according to claim 11, further comprising a sticker attached to the lugs and the surfaces of the lugs facing in the same direction at the same time. A backlight module includes: a backlight; a plastic frame, which is arranged at least partially along the periphery of the backlight; wherein the plastic frame includes one side Wall, a notch formed on the side wall; and the optical film according to any one of claim 1 to claim 10; wherein the first side edge is disposed opposite to the side wall, and the lug is received in the notch . The backlight module according to claim 13, wherein the backlight generates a light, and a part of the light directly or indirectly enters the lug, so that the luminous intensity of the lug is greater than that of the diaphragm body near the first side edge portion. The brightness.