TWI486651B - Protecting film - Google Patents

Description

Protective film

The present invention relates to a protective film, and more particularly to a protective film for protecting a light guide plate.

The light guide plate is an important component of the backlight module. In order to ensure that the light guide plate is not scratched or stained before assembly, the light guide plate factory will cover the light guide plate and then transport it to the backlight module factory.

Referring to the first and second figures, respectively, it is a top view and a cross-sectional view of a conventional protective film. In the first figure, for convenience of description, the light source module 1 is further illustrated, and the light source module 1 includes a light guide plate 10 and a light-emitting element 12. The light guide plate 10 has a flat shape and is transparent to light. The light-emitting element 12 is located on one side of the light guide plate 10 in a side-in type design.

The light guide plate 10 includes a light exiting plane 100, and a plurality of light exiting structures 102 are formed on the light exiting plane 100, which is commonly known as a pattern in the industry. The light guide plate 10 can be divided into a low beam side 104 and a high beam side 106 with respect to the low beam side 104 according to the distance from the light emitting element 12. The arrangement density of the light-emitting structure 102 is generally increased from the low-light side 104 toward the high-beam side 106, and the light-emitting structure 102 is used to extract light entering the light guide plate 10 so that the light is emitted from the light-emitting plane 100.

The protective film 2 comprises a substrate 20 and a glue 22, and the glue 22 is disposed on the lower surface of the substrate 20 to form a substantially rectangular layout region. The glue 22 is used to enable the substrate 20 The light-emitting surface 100 of the light guide plate 10 is attached to the light guide plate 10 to protect the light guide plate 10.

About 70% of the cost of the protective film 2 falls on the glue 22. On the other hand, the density of the light-emitting structure 102 disposed on the high beam side 106 is higher than the density of the light-emitting structure 102 disposed on the low-light side 104, so that the adhesive strength of the glue 22 on the high-beam side 106 is lower than that of the glue 22. The adhesive strength of the side 104 is low. Because the tearing is relatively good, the operator peels off the protective film 2 from the high beam side 106 of the light guide plate 10 toward the low light side 104 when assembling the light guide plate 10, but this makes The low-light side 104 of the light guide plate 10 generates static electricity accumulation, thereby damaging the light-emitting element 12 and peripheral circuits.

An object of the present invention is to provide a protective film for covering the light exiting surface of the light guide plate to prevent the light guide plate from being scratched, rubbed, and contaminated by foreign matter such as dust before being assembled.

In an embodiment, the present invention provides a protective film for covering a light exiting surface of a light guide plate, and a light exiting structure is formed on the light exiting surface. The light guide plate comprises a light-incident side for providing a light source. The light-emitting plane has a low-light side close to the light-incident side and a far-light side away from the light-incident side, and the layout density of the light-emitting structure increases from the low-light side toward the high-beam side. . The protective film comprises a substrate, a first glue zone and a plurality of second glue zones. The base material comprises a bearing surface facing the light exiting plane. The first glue zone is disposed on the bearing surface and defines a first closure on the bearing surface. region. The second rubber zone is disposed on the bearing surface and located inside the first closed area, and the second rubber zone is respectively connected to a line segment closest to the high beam side of the first rubber zone, and cooperates with the line segment to define a plurality of second closed regions, and the second sealing zone The area of the area is reduced from the low beam side toward the high beam side.

Thereby, the protective film can be effective because of the layout of the first rubber zone and the plurality of second rubber zones. Protecting the light guide plate while saving the glue material and greatly reducing the cost.

In other embodiments, the width of the first rubber zone is from 1 to 8 mm, and the width of the second rubber zone is from 1 to 8 mm. Further, the width of the first rubber zone is 2 to 4 mm, and the width of the second rubber zone is 2 to 4 mm, respectively, thereby reducing the amount of use of the first rubber zone and the second rubber zone, thereby reducing The manufacturing cost of the protective film. The first rubber zone and the second rubber zone are usually made of the same material.

When the second rubber zone is actually disposed, any two second rubber zones are mutually disjoint, and the first closed zone and the second closed zone are both substantially rectangular, for example, the first closed area and the second closed area. In addition to the first closed area and the second closed area, the first closed area and the second closed area may also have two adjacent sides of a right angle and a right angle.

In this way, the first adhesive zone can effectively block foreign matter such as dust from entering the light guide plate because of the layout on the outermost edge of the light guide plate, and the second adhesive zone can increase the adhesion between the protective film and the light guide plate.

In another embodiment, the present invention provides a protective film for covering a light exiting surface of a light guide plate, and a light emitting structure is formed on the light emitting surface, and the light guide plate includes two light incident sides for providing a light source, and a light emitting structure. The layout density increases as it moves away from the two light entrance sides, and the protective film comprises a substrate, a first glue zone and a plurality of second glue zones. The substrate comprises a bearing surface, the bearing surface faces the light emitting plane; the first rubber area is disposed on the bearing surface, and defines a first closed area on the bearing surface; the second glue area is disposed in the first closed area, defining a plurality of second In the enclosed area, the area of the second enclosed area shrinks as it moves away from the two near-light sides.

In other embodiments, the first rubber zone has a width of 1 to 8 mm, and the second rubber zone The widths selected are 1 to 8 mm, respectively. Further, the width of the first rubber zone is 2 to 4 mm, and the width of the second rubber zone is 2 to 4 mm, respectively, thereby reducing the amount of the first rubber material and the second rubber material, thereby further reducing the amount of the first rubber material and the second rubber material. Reduce the manufacturing cost of the protective film.

When the second glue zone is actually disposed, any of the second closed areas do not intersect each other, and the first closed area is substantially rectangular, and the second closed areas are substantially rectangular.

In this way, the protective film can be cut to various predetermined gauge sizes as needed, and provides a high adhesion on the high beam side to prevent artificial static electricity from accumulating on the low beam side.

1, 3‧‧‧ light source module

10, 32‧‧‧Light guide plate

100, 320‧‧‧ light plane

102, 322‧‧‧ light structure

104, 324‧‧‧ Near-light side

106, 326‧‧‧High beam side

12‧‧‧Lighting elements

2, 4, 5, 6, 7, 8‧ ‧ protective film

20, 40, 80‧‧‧ substrates

22‧‧‧Stained materials

30‧‧‧Light source

400, 800‧‧ ‧ bearing surface

42, 82‧‧‧ first rubber zone

420, 422‧‧ ‧ line segments

44, 54, 64, 74, 84‧‧‧second rubber zone

46, 86‧‧‧ first enclosed area

48, 58, 68‧‧‧Second enclosed area

The first figure is a cross-sectional view of a conventional protective film.

The second figure is a top view of a conventional protective film.

The third drawing is a plan view of the protective film according to the first embodiment of the present invention.

The fourth figure is a cross-sectional view of the protective film according to the first embodiment of the present invention.

Fig. 5 is a plan view showing a protective film according to a second embodiment of the present invention.

Fig. 6 is a plan view showing a protective film according to a third embodiment of the present invention.

7 is a plan view of a protective film according to a fourth embodiment of the present invention;

Fig. 8 is a plan view showing a protective film according to a fifth embodiment of the present invention.

Referring to the third and fourth figures, respectively, a plan view and a cross-sectional view of the protective film according to the first embodiment of the present invention are shown. For convenience of explanation, the light source module is further illustrated in the fourth figure. The light source module 3 includes a plurality of light sources 30 and a light guide plate 32, and the light source 30 is disposed on the light guide plate. One side of 32 is illuminated in the direction of the light guide plate 32. Light source 30 is typically a point source that can be implemented by a light emitting diode, but other possibilities are not excluded. The light guide plate 32 has a flat shape and is transparent to light, and is usually composed of acrylic (PMMA) or plastic (PC), but does not exclude other equals; for example, the plate on which the light guide plate 32 is made may be acrylic resin (Acrylic Resin). , consisting of a cyclic olefin polymer (COC), polymethyl methacrylate (PMMA), polycarbonate (PC), polyetherimide, fluorocarbon polymer or silicone. At least one material or other replaceable material in the group of materials.

The light guide plate 32 includes a light exiting surface 320. The light exiting surface 320 is formed with a light emitting structure 322 for extracting light entering the light guide plate 32, so that the light is emitted from the light exiting plane 320. The light guide plate 320 defines a low beam side 324 and a high beam side 326 with respect to the low beam side 324; the low beam side 324 refers to the side of the light guide plate 32 provided with the light source 30, and the high beam side 326 refers to the guide. The light plate 32 is opposite to the side on which the light source 30 is disposed. The layout density of the light exiting structure 322 is increased from the low beam side 324 toward the high beam side 326 to provide uniform light intensity of the light exiting plane.

The protective film 4 covers the light exiting surface 320 of the light guide plate 32. The protective film 4 is used to prevent the light guide plate from being scratched or scratched before being assembled, and the foreign matter such as dust is prevented from adhering to the light exiting plane 320, thereby affecting the light source module. 3 light effect.

The protective film 4 includes a substrate 40, a first adhesive region 42 and a plurality of second adhesive regions 44. The substrate 40 includes a carrier surface 400 that faces the light exit surface 320. The substrate 40 can be made of a light-transmitting material. Of course, the substrate 40 can also be made of an opaque material.

The first rubber zone 42 is disposed on the bearing surface 400 and defines a first closed zone on the bearing surface 400 Field 46, the first enclosed area 46 is generally rectangular. In the present embodiment, the light guide plate 32 has a rectangular flat shape, so when the protective film 4 is combined with the light guide plate 32, the first adhesive region 42 is located at the edge of the light guide plate 32, so that dust can be effectively avoided. The foreign matter is attached to the light exiting plane 320.

The width of the first rubber zone 42 may be, for example, 1 to 8 mm, and the width of the first rubber zone 42 may be reduced to 2 to 4 mm without affecting the bonding strength of the protective film 4 and the light guide plate 32. PCT.

The second glue zone 44 is disposed on the bearing surface 400 and is located within the first enclosed area 46. The second glue zones 44 are respectively connected to a line segment 420 of the first glue zone 42 closest to the high beam side 326, and cooperate with the line segment 420 to define a plurality of second closed regions 48. In other words, the first enclosed area 46 is adjacent to the second enclosed area 48.

These second enclosed regions 48 are generally rectangular in shape, and the area of the second enclosed region 48 is reduced by the low beam side 324 toward the high beam side 326. That is, the second glue zone 44 has a higher density at the corresponding high beam side 326 than the light source side 324, so that the second glue zone 44 is bonded to the light guide plate 32, and its adhesion on the high beam side 326. The strength is approximately the same or even greater than the adhesion strength of the low beam side 324. Thereby, when the user tears off the protective film 4, it will not tear from the high beam side 326 toward the low light side 324 due to the hand smoothness, causing static electricity to accumulate at the light source 30.

The width of the second adhesive zone 44 may be, for example, 1 to 8 mm, and the width of the second adhesive zone 44 may be reduced to 2 to 4 mm without affecting the adhesion strength of the protective film 4 and the light guide plate 32. The first rubber zone 42 and the second rubber zone 44 may be made of the same material, or the first rubber zone 42 and the second rubber zone 44 may be made of different materials.

Referring to Fig. 5, there is shown a plan view of a protective film according to a second embodiment of the present invention. First The protective film 5 shown in FIG. 5 is similar to the protective film 4 of the first embodiment, and the same elements are denoted by the same reference numerals. It should be noted that the difference between the two is that the second rubber regions 54 shown in the fifth figure are respectively connected to one of the first rubber regions 42 closest to the high beam side and the other line adjacent to the line segment 420. Segment 422, and in conjunction with line segments 420 and 422, defines a plurality of second enclosed regions 58. It is claimed that the first closed area 46 and the second closed area 58 have two adjacent sides of a right angle and a right angle. Thereby, the adhesive ability of the protective film 5 on the low light side of the light guide plate can be made substantially the same as the adhesive power of the high beam side of the light guide plate.

In addition, the second adhesive regions 54 arranged in this manner and the second closed regions 58 formed by the matching of the segments 420 and 422 are diagonally intersected, so that the light guide plates of different sizes can be cut. The function and related description of each element of the protective film 5 are substantially the same as those of the protective film 4 of the first embodiment, and will not be described herein. The protective film 5 can at least achieve the same function as the protective film 4.

Referring to the sixth drawing, a plan view of a protective film according to a third embodiment of the present invention is shown. The protective film 6 shown in the sixth embodiment is similar to the protective film 4 of the first embodiment, and the same elements are denoted by the same reference numerals. It should be noted that the difference between the two is that the second rubber regions 64 shown in the sixth figure are concentrically arranged in the first closed region 46, and each of the second rubber regions 64 is closed. A second enclosed region 68 is formed. In the present embodiment, the second enclosed region 68 is substantially rectangular.

The first adhesive zone 42 and the second adhesive zone 64 are respectively combined with the light exiting plane of the light guide plate to cover the light exiting surface of the light guide plate. In this way, foreign matter such as dust can be prevented from adhering to the light exiting plane of the light guide plate to affect the light uniformity of the light source module having the light guide plate. The function and related description of each element of the protective film 6 are substantially the same as those of the protective film 4 of the first embodiment, and will not be described herein. The protective film 6 can be at least The same function as that of the protective film 4 is achieved, and it is suitable for the light guide plate which is double-sided into the light, or is cut therefrom into two of the aforementioned protective films 4.

Referring to the seventh drawing, a plan view of a protective film according to a fourth embodiment of the present invention is shown. The protective film 7 shown in the seventh embodiment is similar to the protective film 4 of the first embodiment, and the same elements are denoted by the same reference numerals. It is worth noting that the difference between the two is that the second rubber zone 74 shown in the seventh figure is spirally disposed in the first closed region 46. Therefore, the adhesion strength of the protective film 7 on the low beam side of the light guide plate is substantially the same as the adhesion strength on the high beam side of the light guide plate.

In the present embodiment, the second rubber zone 74 is spirally disposed in the first closed region 46 in a clockwise direction. In actual implementation, the second rubber zone 74 may also be spirally disposed in the first closed state in a counterclockwise direction. Within area 46. The function and related description of each element of the protective film 7 are substantially the same as those of the protective film 4 of the first embodiment, and will not be described herein. The protective film 7 can at least achieve the same function as the protective film 4.

Referring to the eighth embodiment, a plan view of a protective film according to a fifth embodiment of the present invention is shown. The protective film 8 is disposed on a light-emitting surface of the light guide plate to prevent the light-emitting plane from being scratched or rubbed before the light-guide plate is assembled, so that the light-emitting structure formed on the light-emitting plane is damaged, and the light source module having the light guide plate is affected. The uniformity of light output.

The light guide plate defines a low beam side and a high beam side with respect to the low beam side, and the low beam side refers to the side of the light guide plate to which the light source is disposed, and vice versa, the high beam side of the light guide plate (refer to the high beam side of the light guide plate) The fourth picture shows). The density of the light-emitting structure increases from the low-light side toward the high-beam side. In the eighth figure, the left side of the protective film 8 corresponds to the high beam side of the light guide plate, and the right side of the protective film 8 corresponds to the low beam side of the light guide plate.

The protective film 8 includes a substrate 80, a first adhesive region 82, and a second adhesive region 84. Substrate 80 It includes a bearing surface 800 and can be made of light-transmitting or opaque material. The first glue zone 82 is disposed on the bearing surface 800 and defines a first enclosed area 86 on the bearing surface 800. When the protective film 8 is combined with the light guide plate, the first adhesive region 82 is substantially disposed on the outer edge of the rectangular plate-shaped light guide plate, so as to prevent foreign matter such as dust from entering the light exiting plane of the light guide plate, and the light source module having the light guide plate The uniformity of light output is reduced.

The second glue zone 84 is disposed on the bearing surface 800 and is located inside the first enclosed area 86. In the present embodiment, the second rubber zone 84 is disposed in the first closed region 86 in a cross shape. The density of the second rubber zone 84 is increased from the low beam side toward the high beam side, so that the adhesion strength of the second glue zone 84 and the light guide plate on the low beam side is substantially the same as the adhesion strength on the high beam side. . In actual implementation, the layout shape of the second rubber zone 84 can be adjusted according to actual needs, and is not limited to a cross shape, but the purpose of the cross shape design is to provide a rubber material with a long side and a short side of the light guide plate, thereby reducing The opportunity for dust and dander to enter.

However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited, that is, the equivalent changes and modifications made by the scope of the present patent application should still be covered by the patent of the present invention. The scope of the scope is intended to protect.

40‧‧‧Substrate

400‧‧‧ bearing surface

42‧‧‧First rubber zone

420, 422‧‧ ‧ line segments

46‧‧‧First enclosed area

5‧‧‧Protective film

54‧‧‧second rubber zone

58‧‧‧Second enclosed area

Claims (10)

a protective film covering a light-emitting plane of a light guide plate, wherein the light-emitting surface is formed with a light-emitting structure, the light-guiding plate includes a light-incident side for providing a light source, and the light-emitting plane has a low beam near the light-incident side a shielding layer having a density of the light-emitting structure extending from the low-light side toward the high-beam side, the protective film comprising: a substrate comprising a bearing surface, the bearing surface a first plastic zone is disposed on the bearing surface, and defines a first closed area on the bearing surface; and a plurality of second rubber zones are disposed on the bearing surface and located inside the first closed area, The second adhesive regions are respectively connected to a line segment closest to the high beam side of the first glue region, and cooperate with the line segment to define a plurality of second closed regions, wherein the areas of the second closed regions are from the low-light side Shrink toward the high beam side. The protective film according to claim 1, wherein the first adhesive region has a width of 1 to 8 mm, and wherein the second adhesive regions have a width of 1 to 8 mm, respectively. The protective film according to claim 2, wherein the first adhesive region has a width of 2 to 4 mm, and the second adhesive regions have a width of 2 to 4 mm, respectively. The protective film according to claim 2 or 3, wherein any two second adhesive regions do not intersect each other, and the first closed region and the second closed regions are substantially rectangular, and the first closed region and the first closed region The second enclosed area is on the verge. The protective film according to claim 4, wherein the first closed region and the second closed regions have a right angle and two adjacent sides of a common right angle. A protective film is disposed on a light-emitting plane of a light guide plate, and a light-emitting structure is formed on the light-emitting surface, the light-guiding plate includes two light-incident sides opposite to each other for setting a light source, and the light-emitting structure is disposed at a density away from the two Adding to the light side, the protective film comprises: a substrate comprising a bearing surface facing the light emitting plane; a first rubber zone disposed on the bearing surface and defining a first surface on the bearing surface The closed area; and the plurality of second glue areas are disposed in the first closed area to define a plurality of second closed areas, and the areas of the second closed areas are reduced as they move away from the two light entering sides. The protective film according to claim 6, wherein the first adhesive region has a width of 1 to 8 mm, and the second adhesive regions have a width of 1 to 8 mm, respectively. The protective film according to claim 7, wherein the first adhesive region has a width of 2 to 4 mm, and the second adhesive regions have a width of 2 to 4 mm, respectively. The protective film according to claim 6 or 7, wherein any of the second closed regions do not intersect each other. The protective film according to claim 9, wherein the first closed region is substantially rectangular and the second closed regions are substantially rectangular.