TWI383215B - Complex optical film and the method for fabrication the same - Google Patents

Description

Composite optical film and manufacturing method thereof

The present invention relates to an optical film applied to a backlight module, and more particularly to a composite optical film.

The liquid crystal display must rely on light to penetrate the liquid crystal layer, and the human eye can observe the influence of the change of the liquid crystal layer. In addition to the traditional small monochrome liquid crystal display module that reflects external light, the existing liquid crystal display uses a backlight module to project light from the back side of the liquid crystal layer. The light provided by the backlight module must uniformly penetrate the liquid crystal layer, and the light projected to the liquid crystal layer must have uniform brightness.

Referring to Figure 1, a cross-sectional view of a conventional display device is shown. The display device in the prior art mainly includes components such as a backlight module 90 and a display panel 94. The backlight module 90 includes a backlight 91, a light guide plate 92, a reflection sheet 93, a brightness enhancement film 95, and a diffusion sheet 96. After the light provided by the backlight 91 enters the light guide plate 92, the reflection of the reflective sheet 93 and the guiding of the light guide plate 92 cause the light to change direction and uniformly project in the direction of the brightness enhancement film 95. The brightness enhancement film 95 is further condensed through the light collecting structure to concentrate the light toward the display panel 94 to enhance the brightness of the front surface of the backlight module 90. However, the regularly arranged light collecting structure and the display panel 94 are liable to generate interference moiré or rainbow mura, so that the image displayed on the display panel 94 is paralyzed. Therefore, on the brightness enhancing film 95, it is usually necessary to add a diffusion sheet 96 having an atomizing structure, and the above-mentioned interference fringe or rainbow pattern can be eliminated through the atomizing structure, and the brightness distribution of the backlight module 90 is more uniform. Moreover, it can also serve as a protective structure for protecting the light collecting structure of the brightness enhancing film 95.

However, the aforementioned backlight module requires a combination of multiple optical films to achieve an ideal backlight effect. The combination of multiple optical films not only increases the number of optical components, but also increases the manufacturing cost, and also increases the assembly required. Process and time. Therefore, how to improve the optical architecture of the backlight module and reduce the number of optical components has become an important technical issue.

In the display device of the prior art, the backlight module must be combined with a plurality of optical components to achieve brightness enhancement, diffusion, and brightness enhancement, and the structure is relatively complicated, and the manufacturing cost is also increased.

In view of the above problems, the present invention provides a composite optical film which is applied to a backlight module to simultaneously achieve brightness enhancement and diffusion functions with a single optical component.

In order to achieve the above object, the present invention provides a composite optical film comprising a flexible substrate, a plurality of protruding light collecting prisms and a plurality of transparent micelles. The collecting prism is disposed on the flexible substrate for collecting light. The transparent micelles are respectively disposed between the corresponding collecting prisms, and a gap region exists between each transparent micelle and the collecting prism. Transparent micelles are used to diffuse light and protect the collecting prisms. The composite optical film replaces the combination of multiple optical films with a single film, which simplifies the structure of the backlight module and reduces the manufacturing cost of the backlight module.

In order to produce the aforementioned composite optical film, the present invention further provides a method of fabricating an optical film comprising the following steps. The flexible substrate is continuously conveyed and the first colloid is continuously applied to the flexible substrate. The first colloid is then pressed with a pressing die to form a plurality of collecting colloids, and the collecting colloid is hardened to form a plurality of collecting prisms. Secondly, the second colloid is disposed between the collecting prisms, and the second colloid is hardened to form a plurality of transparent micelles, and a void region is formed between the transparent micelles and the collecting prisms.

The effect of the invention is to combine the functions achieved by the plurality of optical films in the prior art into a single film, thereby reducing the number of optical components in the backlight module, thereby reducing the production cost. The composite optical film can be quickly fabricated on a single production line, further reducing the manufacturing cost of the composite optical film itself.

Please refer to FIG. 2 and FIG. 3 , which are an embodiment of a display device and a composite optical film according to the present invention. A backlight module 90 and a composite optical film 10 applied to the backlight module 90 are disclosed. The backlight module 90 includes a backlight 91, a light guide plate 92, a reflective sheet 93, and a composite optical film 10. The backlight module 90 is configured to provide a backlight to a display panel 94, wherein the composite optical film 10 is used to achieve diffusion and light collection effects to enhance the front intensity of the backlight. The composite optical film 10 comprises a flexible substrate 11, a plurality of protruding light collecting prisms 12 and a plurality of transparent micelles 13.

The flexible substrate 11 is made of a light transmissive material such as polystyrene (PS), polyvinyl chloride (PVC) or polymethyl methacrylate (PMMA) for light to pass through and can be bent Fold and deform. The flexible substrate 11 is provided with a light-incident surface 111 and a light-emitting surface 112. The light-incident surface 111 is used for incident light passing through the light guide plate 92. After passing through the body of the flexible substrate 11, the flexible substrate 11 is disposed. The light exits from the light exit surface 112 and penetrates to the light collecting prism 12, the plurality of transparent micelles 13 and the display panel 94.

The light collecting prisms 12 are disposed on the light emitting surface 112 of the flexible substrate 11, and each of the light collecting prisms 12 protrudes from the height H of the light emitting surface 112, and the range may be between 20 millimeters (mm) and 25 millimeters (mm). . The light collecting prism 12 is used for refracting and focusing the light, so that the traveling direction of the light is concentrated in the normal direction of the light surface 112 to achieve the brightening effect.

Referring to FIGS. 3 and 4, the transparent micelles 13 are respectively disposed between the corresponding collecting prisms 12. Between the adjacent two transparent micelles 13 of the same light collecting prism 12, it may be point contact, partial contact or no contact. There is a height difference h between the top of the transparent glue group 13 and the corresponding tip end portions of the light collecting prisms 12, which may range between 1 millimeter (mm) and 5 millimeters (mm). In addition, a gap region 14 exists between the bottom of each transparent glue group 13 and the corresponding valley of the light collecting prisms 12. The valleys of the light collecting prisms 12 are formed between two adjacent light collecting prisms 12. The recessed area, the bottom of the transparent glue group 13 refers to the side of the valley of the transparent glue group 13 facing the light collecting prisms 12, and the height D of the gap area 14 ranges from 1 mm (mm) to 20 mm (mm). between. The refractive index difference between the light collecting prism 12 and the void region 14 may range between 1.35 and 1.65, and the refractive index difference between the transparent micelle and the void region 14 may also be between 1.35 and 1.65, thereby The light travels smoothly from the collecting prism 12 to the void region 14, and then enters the transparent micelle 13 from the void region 14. The transparent micelle 13 may further comprise a plurality of diffusion particles 15 uniformly distributed in the transparent micelles 13. The material of the diffusion particles 15 may comprise titanium dioxide or cerium oxide to break up the light and generate atomization to avoid concentration of light. The tip end portion of the light collecting prism 12 is separated to eliminate or reduce interference fringes or rainbow stripes generated by the regularly arranged light collecting prisms 12 and the display panel 94. In addition, the transparent micelle 13 protruding from the collecting prism 12 can also serve as a protective structure to prevent the collecting prism 12 from being damaged, so that no protective sheet is required on the composite optical film 10. Therefore, the composite optical film 10 replaces the combination of the plurality of optical films, simplifies the structure of the backlight module 90, and reduces the manufacturing cost of the backlight module 90.

The transparent micelle 13 is formed by first applying a colloid to the adjacent collecting prisms 12 by a coating tool, and then performing a hardening process to harden the colloid into a transparent micelle. Transparent glue group 13 Materials having different hardening mechanisms such as photohardening materials or thermosetting materials can be used.

The photohardening material may refer to a photo-sensitive adhesive containing a photoinitiator which, upon being irradiated with ultraviolet light, starts to polymerize and harden other components of the colloid, and the photoinitiator may comprise Isopropyl thioxanthone or 2- A material such as hydroxy-(2-methylphenyl)propanone is mixed in urethane, and the present invention is not limited thereto.

The thermosetting material or the remaining polymer component of the foregoing colloid may be a thermosetting resin composed of a thermosetting polymer and an organic solvent. After the heat curing resin is heated, the organic solvent will first volatilize, and the monomer of the heat curing polymer will be heated. Starting polymerization and hardening, which may include materials such as Epoxy-Acrylate, Isooctyl Acrylate, Polyacrylic acid or Methyl Acrylate. The invention is not limited to this.

Referring to FIG. 5, not only each pair of adjacent light collecting prisms 12 needs to be disposed with a transparent glue group 13 , and each transparent glue group 13 can be discontinuously disposed between each pair of adjacent light collecting prisms 12 , that is, No transparent micelles are disposed between the adjacent adjacent light collecting prisms 12.

Referring to FIG. 6 again, the three-dimensional shape of the transparent micelle 13 is an irregular block shape, but the three-dimensional shape of the transparent micelle 13 varies with the coating tool, so it may be an elliptical strip or an irregular strip. The shape is ellipsoidal or spherical, and the invention is not limited thereto.

Referring again to FIG. 3, FIG. 7 and FIG. 8, depending on the difference of the coating tools, the cross-sectional shape of the transparent micelle 13 may be elliptical, with a convex ellipse or an irregular cloud on one side to enhance diffusion. effect.

Please refer to FIG. 9 and FIG. 10 , which are the production machine of the composite optical film of the present invention. A schematic diagram of a stage for explaining an embodiment of the optical film manufacturing method of the present invention to produce a composite optical film of the present invention. In this method, the flexible substrate 11 is continuously conveyed by the roller sets 20a, 20b, and then the first colloid 12a is continuously coated on the flexible substrate 11 by the first coating tool 21, and the first colloid 12a is The material of the light collecting prism 12 is formed. The first coating tool 21 mainly includes a receiving groove 211 and a nozzle 212. The receiving groove 211 is for receiving the first colloid 12a, and the nozzle 212 has a slot, and the extending direction of the slot is flexible. The substrate 11 is conveyed in a direction perpendicular to the first colloid 12a for passage to the continuously moving flexible substrate 11, and the surface of the flexible substrate 11 is coated with a first colloid 12a.

Next, the first colloid 12a is pressed with a pressing die 22 to form a plurality of collecting colloids 12b. Referring to FIG. 11, the pressing mold 22 is a columnar structure that continuously rotates, and has an uneven structure 221 on the outer peripheral surface thereof. After the pressing mold 22 contacts and is pressed against the first colloid 12a, the concave-convex structure 221 The concave portion and the upper convex portion are shaped such that the first colloid 12a is shaped as the light collecting prism 12 to constitute the aforementioned light collecting colloid 12b. Next, the light collecting colloid 12b is hardened by the curing device 23 to form a plurality of collecting prisms 12. The type of the curing device 23 depends on the hardening mechanism of the first colloidal material. If the component is mainly a thermosetting resin, the curing device 23 is a heat source; if the component contains a photoinitiator, the curing device 23 is an ultraviolet light source. A heat source is added to accelerate the evaporation of the organic solvent.

Referring again to Figures 9 and 10, the flexible substrate 11 and the collecting prism 12 are then inverted by the roller sets 20a, 20b and continuously conveyed. At the same time, a release film 24 is continuously conveyed by another set of roller sets 20c, 20d, 20e, 20f, and the second colloid 13a is continuously coated on the release film 24 by the second coating tool 25, the second colloid 13a It is a material for forming the transparent micelle 13. The second coating tool 25 mainly includes a receiving groove 251 and a nozzle 252. The receiving groove 251 is for receiving the second colloid 13a, and the nozzle 252 has a slot, and the extending direction of the slot is away from the slot. The film 24 is conveyed in a direction perpendicular to the direction. Next, the inverted flexible substrate 11 and the release film 24 are brought close to each other, and the direction and speed at which the flexible substrate 11 and the release film 24 are transported are the same. The distance between the flexible substrate 11 and the release film 24 should be greater than or equal to the height of the light collecting prism 12, and at the same time, only the tip end portion of the light collecting prism 12 contacts the second colloid 13a, thereby arranging the second colloid 13a on the collecting prism. 12, and the valleys of the adjacent collecting prisms 12 and the second colloid 13a are separated from the gap region 14 which is not filled, as shown in Fig. 3, Fig. 7, or Fig. 8. Finally, the second colloid 13a is hardened by the hardening means 26, 27 to form a plurality of transparent micelles 13, and the void region 14 is formed between the transparent micelles 13 and the light collecting prisms 12, and the second colloid 13a is hardened to be transparent. After the micelle 13, the release film 24 is peeled off to complete the optical film 10 of the present invention. The type of the hardening device depends on the hardening mechanism of the material of the second colloid 13a. If the component is mainly composed of a thermosetting resin, the curing device only needs a heat source 26; if the component contains a photoinitiator, the hardening device requires a heat source 26 and The ultraviolet light source 27, wherein the second colloid 13a is first heated by the heat source 26 to accelerate the evaporation of the organic solvent and reduce the volume, and then irradiated with the ultraviolet light source 27 to complete the hardening. In addition, the second colloid 13a does not need to be continuously extruded by the second coating tool 25, and the second coating tool 25 can intermittently extrude the second colloid 13a, so that the second colloid 13a is discontinuously adhered to the set. Between the prisms 12, a strip-shaped, block-shaped or irregular strip-shaped, block-shaped transparent micelle 13 is formed.

Since the flexible substrate 11 is inverted, the second colloid 13a is disposed between the collecting prisms 12, and the second colloid 13a can be extruded by the second coating tool 25 in order to prevent the second colloid 13a from being pulled by gravity. Therefore, the viscous coefficient of the second colloid 13a is preferably between 200 cps and 800 cps, which allows the second colloid 13a to adhere to the collecting prism 12 before being hardened, and is not dripped by gravity, and can be smoothly The ground is extruded by the second coating tool 25.

Please refer to FIG. 12 and FIG. 13 , which are the production machine of the composite optical film of the present invention. A schematic diagram of a stage for explaining the method of fabricating the optical film of the present invention to produce a composite optical film of the present invention. In the present embodiment, the steps of fabricating the light-collecting prisms 12 are substantially the same as those of the embodiments described in FIGS. 9 and 10, and the flexible substrate 11 is continuously conveyed by the roller sets 20a, 20b, followed by the first The coating tool 21 continuously coats the first colloid 12a on the flexible substrate 11. Next, the first colloid 12a is pressed with a pressing die 22 to form a plurality of collecting colloids 12b. Finally, the light collecting colloid 12b is hardened by the hardening device 23 to form a plurality of collecting prisms 12.

The flexible substrate 11 and the light collecting prism 12 are then inverted by the roller sets 20a, 20b and continuously conveyed. The second coating tool 25 is directly implanted between the light-collecting prisms 12 and the second coating tool 25, and the second coating tool 25 includes a receiving groove 251 and a nozzle 252, and a second colloid 13a. It is accommodated in the accommodating groove 251, and is implanted between the light collecting prisms 12 via the nozzle 252, and the valley of the inverted light collecting prism 12 is separated from the second colloid 13a by a gap region 14, as shown in FIG. 3, Figure 7 or Figure 8. The nozzle 252 may include a plurality of nozzle holes corresponding to the recessed areas between the adjacent light collecting prisms 12 to directly implant the second colloid 13a. The nozzle 252 may also include a single slit to apply the second colloid 13a to the tip end portion of the collecting prism 12. The viscous coefficient of the second colloid 13a is preferably between 200 cps and 800 cps, so that the second colloid 13a can be attached to the light collecting prism 12 before being hardened, and can be smoothly squeezed by the second coating tool 25. Out. Finally, the second colloid 13a is hardened by a hardening device to form a plurality of transparent micelles 13, while a void region 14 is formed between each of the transparent micelles 13 and the light collecting prisms 12. The second colloid 13a is first irradiated with the ultraviolet light source 27 for hardening, so that the second colloid 13a is prevented from continuously falling down and dripping, and then heated by the heat source 26 to accelerate the evaporation of the organic solvent and reduce the volume, and finally the hardening is completed.

Please refer to FIG. 14 , which is a schematic diagram of a production machine for a composite optical film of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an embodiment of the method for producing an optical film of the present invention to produce a composite optical film of the present invention. In the present embodiment, the steps of producing the light collecting prism 12 and the transparent micelle 13 are substantially the same as those of the embodiments described in Figs. 12 and 13.

In the present embodiment, the second coating tool 25 for coating the second colloid 13a includes an open receiving groove 253, a roller 254, and a scraper 255. The accommodating groove 253 is for accommodating the second colloid 13a, and the roller 254 is partially immersed in the second colloid 13a and continuously rotated to adhere the second colloid 13a to the surface thereof. The scraper 255 is used to wipe the excess second colloid 13a adhered to the roller 254 to control the thickness of the second colloid 13a. The roller 254 is continuously rotated and its tangential speed should be equal to the speed at which the flexible substrate 11 is conveyed. The inverted light collecting prism 12 is in contact with the second colloid 13a adhered to the roller 254, so that the second colloid 13a is implanted between the inverted collecting prisms 12 by the roller 254, so that the inverted collecting prism 12 is The tip end portion contacts the second colloid 13a, and the valley of the inverted light collecting prism 12 is separated from the second colloid 13a by a void region 14, as shown in Fig. 3, Fig. 7, or Fig. 8.

Referring to Figures 15 and 16, there is shown a schematic view of a production machine for a composite optical film of the present invention for explaining an embodiment of the optical film manufacturing method of the present invention for producing the composite optical film of the present invention. In the present embodiment, the steps of fabricating the light-collecting prisms 12 are substantially the same as those of the previous embodiment. The flexible substrate 11 is continuously conveyed by the roller sets 20a, 20b, and then the first coating tool 21 is continuously coated. A colloid 12a is on the flexible substrate 11. Next, the first colloid 12a is pressed with a pressing die 22 to form a plurality of collecting colloids 12b. Finally, the collecting colloid 12b is hardened to form a plurality of collecting prisms 12.

Then, the second colloid 13a is dropped into the second colloid 13a between the light-collecting prisms 12 before the inversion, and then the second colloid 13a is flipped together with the flexible substrate 11 and the collecting prisms 12, so that The dicolloid 13a flows toward the tip end portion of the light-collecting prism 12 after being turned over, and turns over The valleys of the rotated collecting prisms 12 are separated from the inverted second colloid 13a by a gap region 14. In order for the second colloid 13a to flow smoothly without dripping from the concentrating prism 12, the viscous coefficient of the second colloid 13a is preferably between 100 cps and 200 cps. Further, the second colloid 13a further contains an organic solvent. Therefore, in the arrangement of the curing device, the second colloid 13a is first heated by the heat source 26 to volatilize the organic solvent, and the organic solvent gas is pushed against the second colloid 13a to enlarge the void region 14. The volume of the second colloid 13a is reduced, and finally the second colloid 13a is irradiated with the ultraviolet light source 27 to be hardened into the transparent micelle 13.

90‧‧‧Backlight module

91‧‧‧Light source

92‧‧‧Light guide plate

93‧‧‧reflector

94‧‧‧ display panel

95‧‧‧Brightening diaphragm

96‧‧‧Diffuser

10‧‧‧Composite optical diaphragm

11‧‧‧Flexible substrate

111‧‧‧Into the glossy surface

112‧‧‧Glossy

12‧‧‧Lighting prism

12a‧‧‧First colloid

12b‧‧‧Photocolloid

13‧‧‧Transparent micelles

13a‧‧‧Second colloid

14‧‧‧Void area

15‧‧‧Diffusion particles

20a, 20b‧‧‧Roller set

20c, 20d, 20e, 20f‧‧‧ wheel set

21‧‧‧First coating tool

211‧‧‧ accommodating slots

212‧‧‧Nozzles

22‧‧‧Compression mould

221‧‧‧ concave structure

23‧‧‧ Hardening device

24‧‧‧ release film

25‧‧‧Second coating tool

251‧‧‧ accommodating slots

252‧‧‧Nozzles

253‧‧‧ accommodating slots

254‧‧‧Roller

255‧‧‧ scraper

26‧‧‧heat source

27‧‧‧UV source

Fig. 1 is a schematic cross-sectional view showing a display device of the prior art.

Figure 2 is a schematic cross-sectional view of the display device of the present invention.

Fig. 3 is a partial cross-sectional view showing the composite optical film of Fig. 2.

4 to 6 are schematic perspective views showing the appearance of the composite optical film of the present invention.

7 and 8 are partial cross-sectional views showing the composite optical film of the present invention.

Figure 9 is a perspective view showing the production machine of the composite optical film of the present invention.

Figure 10 is a schematic vertical side view of the production machine of the composite optical film of Figure 9.

Figure 11 is a front view of the press mold of Figure 10.

Fig. 12 is a perspective view showing the production machine of the composite optical film of the present invention.

Figure 13 is a schematic vertical side view of the production machine of the composite optical film of Fig. 12.

Figure 14 is a schematic side elevational view of the production machine of the composite optical film of the present invention.

Fig. 15 is a perspective view showing the production machine of the composite optical film of the present invention.

Figure 16 is a schematic vertical side view of the production machine of the composite optical film of Figure 15.

10‧‧‧Composite optical diaphragm

11‧‧‧Flexible substrate

111‧‧‧Into the glossy surface

112‧‧‧Glossy

12‧‧‧Lighting prism

13‧‧‧Transparent micelles

14‧‧‧Void area

15‧‧‧Diffusion particles

Claims (36)

A composite optical film comprising: a flexible substrate; a plurality of protruding light collecting prisms disposed on the flexible substrate; and a plurality of transparent micelles, each of which is discontinuously disposed in correspondence A gap region exists between the light collecting prisms and between each of the transparent micelles and the light collecting prisms. The composite optical film of claim 1, wherein the height of the light collecting prism ranges between 20 mm and 25 mm. The composite optical film of claim 1, wherein the refractive index difference between the light collecting prisms and the void region ranges between 1.35 and 1.65. The composite optical film of claim 1, wherein each of the transparent micelles has an elliptical cross section, a convex elliptical shape on one side, or an irregular cloud shape. The composite optical film of claim 1, wherein each of the transparent micelles protrudes from the height of the light collecting prisms, and the height difference ranges between 1 mm and 5 mm. The composite optical film of claim 1, wherein the transparent micelles further comprise a plurality of diffusion particles. The composite optical film of claim 6, wherein the material of the diffusing particles comprises titanium dioxide or cerium oxide. The composite optical film of claim 1, wherein the transparent micelles are elliptical strips, irregular strips, elliptical spheres or irregular blocks. The composite optical film of claim 1, wherein the materials of the transparent micelles comprise epoxy acrylate, isooctyl acrylate, polyacrylic acid or methyl acrylate. The composite optical film of claim 1, wherein the material of the transparent micelles comprises Isopropyl thioxanthone or 2-hydroxy-(2-methylphenyl)acetone. The composite optical film of claim 1, wherein the difference in refractive index between the transparent micelles and the void region ranges between 1.35 and 1.65. The composite optical film of claim 1, wherein the void region has a height ranging between 1 mm and 20 mm. An optical film manufacturing method comprising the steps of: continuously conveying a flexible substrate; continuously coating a first colloid on the flexible substrate; and pressing the first colloid with a pressing mold, Forming a plurality of collecting colloids; hardening the collecting colloids to form a plurality of collecting prisms; arranging a second colloid between the collecting prisms; and hardening the second colloid to form a plurality of transparent adhesives Between the collecting prisms; wherein each of the transparent micelles and the collecting prisms have a gap region. The optical film manufacturing method of claim 13, wherein the second colloid has a viscosity coefficient range between 200 cps and 800 cps. The optical film manufacturing method of claim 14, further comprising: inverting the flexible substrate and the light collecting prisms; continuously transferring a release film; wherein the second colloid is disposed on the light collection The step between the prisms is: coating the second colloid on the release film; The inverted flexible substrate and the release film are brought into close proximity to each other; and the tip end portions of the light-collecting prisms after the inversion are brought into contact with the second colloid, and the inverted valleys of the collected prisms are The second colloid is separated from the void region; and the release film is peeled off. The optical film manufacturing method of claim 14, further comprising: inverting the flexible substrate and the light collecting prisms; wherein the step of disposing the second colloid between the light collecting prisms is The second colloid is implanted between the light collecting prisms after the flipping by a nozzle or a roller. The optical film manufacturing method of claim 14, further comprising: inverting the flexible substrate and the light collecting prisms; wherein the step of disposing the second colloid between the light collecting prisms is The tip end portions of the light-collecting prisms after the inversion are brought into contact with the second colloid, and the valleys of the inverted light-collecting prisms are separated from the second colloid by the gap region. The optical film manufacturing method of claim 13, further comprising: dropping the second colloid with the nozzle between the light collecting prisms before the turning; along with the flexible substrate and the collecting prisms, And rotating the second colloid; and flowing the second colloid to the tip end portions of the light-collecting prisms after the turning, and separating the valleys of the light-collecting prisms after the turning from the inverted second colloid region. The optical film manufacturing method of claim 18, wherein the second colloid has a viscosity coefficient ranging between 100 cps and 200 cps. The optical film manufacturing method of claim 13 or 18, wherein the second colloid further comprises The solvent is used, and after the second colloid is disposed, the method further comprises: heating the second colloid to volatilize the organic solvent, and reducing the volume of the second colloid. A composite optical film comprising: a flexible substrate; a plurality of protruding light collecting prisms disposed on the flexible substrate; and a plurality of transparent micelles, each of which is disposed in the corresponding set Between the light prisms, each of the transparent micelles contacts at least two of the light collecting prisms, and a void region is formed between each of the transparent micelles and the light collecting prisms that are in contact with each other. The composite optical film of claim 21, wherein each of the transparent micelles is located in a recessed region between the collection prisms that are in contact. The composite optical film of claim 21, wherein each of the void spaces is formed by each of the transparent micelles themselves and the light collecting prisms that are in contact therewith. The composite optical film of claim 21, wherein the height of the light collecting prisms is between 20 mm and 25 mm. The composite optical film of claim 21, wherein the refractive index difference between the light collecting prisms and the void region ranges between 1.35 and 1.65. The composite optical film of claim 21, wherein each of the transparent micelles has an elliptical cross section, a convex ellipse or an irregular cloud on one side. The composite optical film of claim 21, wherein each of the transparent micelles is discontinuously disposed between the light collecting prisms. The composite optical film of claim 21, wherein each of the transparent micelles highlights the collected light The prism has a height difference and the height difference ranges between 1 mm and 5 mm. The composite optical film of claim 21, wherein the transparent micelles further comprise a plurality of diffusing particles. The composite optical film of claim 29, wherein the material of the diffusing particles comprises titanium dioxide or cerium oxide. The composite optical film of claim 21, wherein the transparent micelles are elliptical strips, irregular strips, ellipsoidal spheres or irregular blocks. The composite optical film of claim 21, wherein the transparent micelles are in point contact, partial contact or non-contact. The composite optical film of claim 21, wherein the materials of the transparent micelles comprise epoxy acrylate, isooctyl acrylate, polyacrylic acid or methyl acrylate. The composite optical film of claim 21, wherein the material of the transparent micelles comprises isopropanone or 2-hydroxy-(2-methylphenyl)acetone. The composite optical film of claim 21, wherein the difference in refractive index between the transparent micelles and the void region ranges between 1.35 and 1.65. The composite optical film of claim 21, wherein the void region has a height ranging between 1 mm and 20 mm.