OPTICAL FILM, BACKLIGHT MODULE AND MANUFACTURING METHOD OF BACKLIGHT MODULE

An optical film, a backlight module, and a method for manufacturing the optical film are provided. The optical film includes a quantum dot gel layer, a first shielding layer, a second shielding layer, a first plastic layer, and a second plastic layer. The first shielding layer is disposed on one side of the quantum dot gel layer. The second shielding layer is disposed on another side of the quantum dot gel layer. The first plastic layer is disposed on a side of the first shielding layer away from the quantum dot gel layer. The second plastic layer is disposed on a side of the second shielding layer away from the quantum dot gel layer. The first shielding layer and the second shielding layer are each made of a barrier coating, and the barrier coating contains water, isopropanol, sodium bicarbonate, organic acid, and acrylic.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application claims the benefit of priority to Taiwan Patent Application No. 109120338, filed on Jun. 17, 2020. The entire content of the above identified application is incorporated herein by reference.

FIELD OF THE DISCLOSURE

The present disclosure relates to an optical film, and more particularly to an optical film that is capable of shielding moisture and oxygen, a backlight module, and a method for manufacturing the optical film.

BACKGROUND OF THE DISCLOSURE

After decades of technology development in the display industry, conventional liquid crystal displays (LCD) are facing considerable challenges from the emergence of organic light emitting diode (OLED) displays having wide color gamut. Therefore, improving color gamut and vividness of displays is an inevitable direction of development. Under the technological competition, quantum dot films having increased color purity and without the requirement of changing structures of the LED panels have come into existence. The quantum dot films are manufactured through coating and attaching pure color quantum dots onto polyethylene terephthalate (PET) films, and then disposing the PET films in backlight modules.

Currently, quantum dot materials are required to be shielded from an environment with moisture and oxygen, such that the light emitting effect thereof functions normally. However, moisture and oxygen shielding ability of epoxies that are used to encapsulate resin and PET films often fail to meet the requirements. Therefore, when enhancing color gamut of the displays by using the quantum dot films, manufacturers usually add shielding films on an inner side or an outer side of the PET films, so as to block moisture and oxygen. However, this reduces the production yield and increases the manufacturing cost, making it difficult for the prices of the products to be lowered and causing the manufacturing time to be increased. In addition, in the usage of PET films, since problems associated with thick coating layers and dispersed resin are present in the manufacturing processes thereof, PET films with greater thicknesses are usually used, causing the finished products to be too thick and unsuitable for applications other than in televisions. Therefore, the usage of quantum dot technology on displays is limited.

SUMMARY OF THE DISCLOSURE

In response to the above-referenced technical inadequacies, the present disclosure provides an optical film, a backlight module, and a method for manufacturing the optical film.

In one aspect, the present disclosure provides an optical film including a quantum dot gel layer, a first shielding layer, a second shielding layer, a first plastic layer, and a second plastic layer. The first shielding layer is disposed on one side of the quantum dot gel layer. The second shielding layer is disposed on another side of the quantum dot gel layer. The first plastic layer is disposed on a side of the first shielding layer away from the quantum dot gel layer. The second plastic layer is disposed on a side of the second shielding layer away from the quantum dot gel layer. The first shielding layer and the second shielding layer are each made of a barrier coating, and the barrier coating contains water, isopropanol, sodium bicarbonate, organic acid, and acrylic.

Preferably, based on a total weight of the barrier coating being 100 weight percent (wt %), a composition of the water is 30 wt % to 70 wt %, a composition of the isopropanol is 5 wt % to 15 wt %, a composition of the sodium bicarbonate is 5 wt % to 15 wt %, a composition of the organic acid is 5 wt % to 20 wt %, and a composition of the acrylic is 10 wt % to 30 wt %. The barrier coating is a weak acid, and a pH value of the barrier coating is between 5.0 and 6.7.

Preferably, the quantum dot gel layer contains photoinitiator, a plurality of scattering particles, mercaptan, and acrylic. Based on a total weight of the barrier coating being 100 wt %, a composition of the photoinitiator is 1 wt % to 5 wt %, a composition of the scattering particle is 10 wt % to 30 wt %, a composition of the acrylic is 20 wt % to 70 wt %, and a composition of the mercaptan is 15 wt % to 65 wt %.

Preferably, the photoinitiator is selected from a group consisting of: 1-hydroxycyclohexyl phenyl ketone, benzoyl isopropanol, tribromomethyl phenyl sulfone, and diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide, the scattering particles are surface treated microbeads having a diameter of 0.5 micrometer (μm) to 20 μm that are made of acrylic, silicon dioxide, or polystyrene, and the mercaptan is selected from a group consisting of: 2,2′-(ethylenedioxy) diethanethiol, 2,2′-thiodiethanethiol, trimethylolpropane tris(3-mercaptopropionate), poly(ethylene glycol) dithiol, pentaerythritol tetrakis (3-mercaptopropionate), ethylene glycol bis-mercaptoacetate, and ethyl 2-mercaptopropionate.

Preferably, the first plastic layer and the second plastic layer are each made of polyethylene terephthalate.

In another aspect, the present disclosure provides a backlight module including a light guide unit, at least one light emitting unit, and an optical unit. The light guide unit has a light entrance side. The at least one light emitting unit corresponds to the light entrance side. The optical unit corresponds to the light entrance side and is disposed between the light guide unit and the at least one light emitting unit. The optical unit includes a quantum dot gel layer, a first shielding layer, a second shielding layer, a first plastic layer, and a second plastic layer. The first shielding layer is disposed on one side of the quantum dot gel layer. The second shielding layer is disposed on another side of the quantum dot gel layer. The first plastic layer is disposed on a side of the first shielding layer away from the quantum dot gel layer. The second plastic layer is disposed on a side of the second shielding layer away from the quantum dot gel layer. The first shielding layer and the second shielding layer are each made of a barrier coating, and the barrier coating contains water, isopropanol, sodium bicarbonate, organic acid, and acrylic.

Preferably, based on a total weight of the barrier coating being 100 wt %, a composition of the water is 30 wt % to 70 wt %, a composition of the isopropanol is 5 wt % to 15 wt %, a composition of the sodium bicarbonate is 5 wt % to 15 wt %, a composition of the organic acid is 5 wt % to 20 wt %, and a composition of the acrylic is 10 wt % to 30 wt %. The barrier coating is a weak acid, and a pH value of the barrier coating is between 5.0 and 6.7.

Preferably, the quantum dot gel layer contains photoinitiator, a plurality of scattering particles, mercaptan, and acrylic. Based on a total weight of the barrier coating being 100 wt %, a composition of the photoinitiator is 1 wt % to 5 wt %, a composition of the scattering particle is 10 wt % to 30 wt %, a composition of the acrylic is 20 wt % to 70 wt %, and a composition of the mercaptan is 15 wt % to 65 wt %.

Preferably, the photoinitiator is selected from a group consisting of: 1-hydroxycyclohexyl phenyl ketone, benzoyl isopropanol, tribromomethyl phenyl sulfone, and diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide, the scattering particles are surface treated microbeads having a diameter of 0.5 μm to 20 μm that are made of acrylic, silicon dioxide, or polystyrene, and the mercaptan is selected from a group consisting of: 2,2′-(ethylenedioxy) diethanethiol, 2,2′-thiodiethanethiol, trimethylolpropane tris(3-mercaptopropionate), poly(ethylene glycol) dithiol, pentaerythritol tetrakis (3-mercaptopropionate), ethylene glycol bis-mercaptoacetate, and ethyl 2-mercaptopropionate.

Preferably, the first plastic layer and the second plastic layer are each made of polyethylene terephthalate.

In yet another aspect, the present disclosure provides a method for manufacturing an optical film including: coating a barrier coating on a first plastic layer; coating the barrier coating on a second plastic layer; disposing a quantum dot gel layer on the second plastic layer, so that the barrier coating on the second plastic layer is attached to the quantum dot gel layer; disposing the first plastic layer on the quantum dot gel layer, so that the barrier coating on the first plastic layer is attached to the quantum dot gel layer; and performing a curing process to cure the barrier coating on the first plastic layer and the second plastic layer, so as to form a first shielding layer between the first plastic layer and the quantum dot gel layer, and form a second shielding layer between the second plastic layer and the quantum dot gel layer. The barrier coating contains water, isopropanol, sodium bicarbonate, organic acid, and acrylic.

Preferably, based on a total weight of the barrier coating being 100 wt %, a composition of the water is 30 wt % to 70 wt %, a composition of the isopropanol is 5 wt % to 15 wt %, a composition of the sodium bicarbonate is 5 wt % to 15 wt %, a composition of the organic acid is 5 wt % to 20 wt %, and a composition of the acrylic is 10 wt % to 30 wt %. The barrier coating is a weak acid, and a pH value of the barrier coating is between 5.0 and 6.7.

Preferably, the quantum dot gel layer contains photoinitiator, a plurality of scattering particles, mercaptan, and acrylic. Based on a total weight of the barrier coating being 100 wt %, a composition of the photoinitiator is 1 wt % to 5 wt %, a composition of the scattering particle is 10 wt % to 30 wt %, a composition of the acrylic is 20 wt % to 70 wt %, and a composition of the mercaptan is 15 wt % to 65 wt %.

Preferably, the photoinitiator is selected from a group consisting of: 1-hydroxycyclohexyl phenyl ketone, benzoyl isopropanol, tribromomethyl phenyl sulfone, and diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide, the scattering particles are surface treated microbeads having a diameter of 0.5 μm to 20 μm that are made of acrylic, silicon dioxide, or polystyrene, and the mercaptan is selected from a group consisting of: 2,2′-(ethylenedioxy) diethanethiol, 2,2′-thiodiethanethiol, trimethylolpropane tris(3-mercaptopropionate), poly(ethylene glycol) dithiol, pentaerythritol tetrakis (3-mercaptopropionate), ethylene glycol bis-mercaptoacetate, and ethyl 2-mercaptopropionate.

Preferably, the first plastic layer and the second plastic layer are each made of polyethylene terephthalate.

One of the beneficial effects of the optical film of the present disclosure is that the optical film is capable of achieving the effect of shielding moisture and oxygen through the technical solutions of “the first shielding layer disposed on one side of the quantum dot gel layer”, “the second shielding layer disposed on another side of the quantum dot gel layer”, and “the first shielding layer and the second shielding layer each being made of the barrier coating, and the barrier coating containing water, isopropanol, sodium bicarbonate, organic acid, and acrylic”.

One of the beneficial effects of the backlight module of the present disclosure is that the backlight module is capable of achieving the effect of shielding moisture and oxygen through the technical solutions of “the first shielding layer disposed on one side of the quantum dot gel layer”, “the second shielding layer disposed on another side of the quantum dot gel layer”, and “the first shielding layer and the second shielding layer each being made of the barrier coating, and the barrier coating containing water, isopropanol, sodium bicarbonate, organic acid, and acrylic”.

One of the beneficial effects of the method for manufacturing the optical film of the present disclosure is that the method is capable of achieving the effect of shielding moisture and oxygen through the technical solutions of “coating the barrier coating on the first plastic layer”, “coating the barrier coating on the second plastic layer”, “disposing the quantum dot gel layer on the second plastic layer, so that the barrier coating on the second plastic layer is attached to the quantum dot gel layer”, “disposing the first plastic layer on the quantum dot gel layer, so that the barrier coating on the first plastic layer is attached to the quantum dot gel layer”, “performing the curing process to cure the barrier coating on the first plastic layer and the second plastic layer, so as to form the first shielding layer between the first plastic layer and the quantum dot gel layer, and form the second shielding layer between the second plastic layer and the quantum dot gel layer”, and “the barrier coating containing water, isopropanol, sodium bicarbonate, organic acid, and acrylic”.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

First Embodiment

References are made toFIG. 1toFIG. 7.FIG. 1is a first flowchart showing a method for manufacturing an optical film in a first embodiment of the present disclosure.FIG. 2is a schematic view showing step S51of the method for manufacturing the optical film in the first embodiment of the present disclosure.FIG. 3is a schematic view showing step S52of the method for manufacturing the optical film in the first embodiment of the present disclosure.FIG. 4is a schematic view showing step S53of the method for manufacturing the optical film in the first embodiment of the present disclosure.FIG. 5is a schematic view showing step S54of the method for manufacturing the optical film in the first embodiment of the present disclosure.FIG. 6is a structural schematic view of the optical film in the first embodiment of the present disclosure.FIG. 7is a second flowchart showing the method for manufacturing the optical film in the first embodiment of the present disclosure. As shown in the figures, a method for manufacturing an optical film F is provided in the first embodiment of the present disclosure, the method including the following steps:

step S51: coating a barrier coating on a first plastic layer;

step S52: coating the barrier coating on a second plastic layer;

step S53: disposing a quantum dot gel layer on the second plastic layer and attaching the barrier coating on the second plastic layer to the quantum dot gel layer;

step S54: disposing the first plastic layer on the quantum dot gel layer and attaching the barrier coating on the first plastic layer to the quantum dot gel layer; and

step S55: performing a curing process to cure the barrier coating on the first plastic layer and the second plastic layer, so as to form a first shielding layer between the first plastic layer and the quantum dot gel layer, and form a second shielding layer between the second plastic layer and the quantum dot gel layer.

Firstly, in step S51, a barrier coating B1is coated on a first plastic layer F4. For example, as shown inFIG. 1andFIG. 2, a material of the first plastic layer F4can be polyethylene terephthalate (PET), and the barrier coating B1can include water, isopropanol (IPA), sodium bicarbonate, organic acid, mercaptan, and acrylic, but the present disclosure is not limited thereto. The barrier coating B1can be formed on the first plastic layer F4through coating and then undergo a drying process.

Next, in step S52, a barrier coating B2is coated on a second plastic layer F5. For example, as shown inFIG. 1andFIG. 3, a material of the second plastic layer F5can be PET, and the barrier coating B2can include water, IPA, sodium bicarbonate, organic acid, mercaptan, and acrylic, but the present disclosure is not limited thereto. The barrier coating B2can be formed on the second plastic layer F5through coating and then undergo a drying process.

It should be noted that, for the above-mentioned barrier coating B1and barrier coating B2, based on a total weight of the barrier coating B1or B2being 100 weight percent (wt %), a composition of the water can be 30 wt % to 70 wt %, a composition of the IPA can be 5 wt % to 15 wt %, a composition of the sodium bicarbonate can be 5 wt % to 15 wt %, a composition of the organic acid can be 5 wt % to 20 wt %, and a composition of the acrylic can be 10 wt % to 30 wt %. The barrier coating B1or B2can be a weak acid, and a pH value thereof can be between 5.0 and 6.7.

Furthermore, the acrylic can be selected from a group consisting of:

Next, in step S53, a quantum dot gel layer F1is disposed on the second plastic layer F5, and the barrier coating B2on the second plastic layer F5is attached to the quantum dot gel layer F1. For example, as shown inFIG. 1andFIG. 4, the quantum dot gel layer F1can include quantum dot gel, but the present disclosure is not limited thereto. The quantum dot gel is arranged on the barrier coating B2on the second plastic layer F5through coating or other manner of applying, such that the barrier coating B2is on one surface of the quantum dot gel layer F1.

Next, in step S54, the first plastic layer F4is disposed on the quantum dot gel layer F1, and the barrier coating B1on the first plastic layer F4is attached to the quantum dot gel layer F1. For example, as shown inFIG. 1andFIG. 5, the first plastic layer F4disposed with the barrier coating B1is disposed above the quantum dot gel layer F1, and the barrier coating B1under the first plastic layer F4is attached to the quantum dot gel layer F1on a relatively upper side thereof; that is, the barrier coating B1is attached to another surface of the quantum dot gel layer F1.

Next, in step S55, a curing process is performed to cure the barrier coating B1and the barrier coating B2on the first plastic layer F4and the second plastic layer F5, respectively, so as to form a first shielding layer F2between the quantum dot gel layer F1and the first plastic layer F4, and form a second shielding layer F3between the quantum dot gel layer F1and the second plastic layers F5. For example, as shown inFIG. 1andFIG. 6, the first shielding layer F2and the second shielding layer F3are respectively formed on two opposite sides of the quantum dot gel layer F1through performing the curing process (e.g., thermal curing, but the present disclosure is not limited thereto) that cure the barrier coating B1and the barrier coating B2, so as to form the optical film F of the present disclosure, thereby achieving the effect of protecting the quantum dot gel layer F1.

Accordingly, the optical film F provided by the present disclosure through the above technical solution improves the overall formulation of the conventional quantum dot film, which enhances moisture and oxygen shielding ability of the optical film F, without the requirement of additional barrier films. In addition, the first shielding layer F2and the second shielding layer F3of the present disclosure can also be coated or attached to a thinner PET film to reduce an overall thickness of the optical film F, thereby increasing the scope of application.

Furthermore, the quantum dot gel layer F1of the optical film F of the present disclosure can contain photoinitiator, a plurality of scattering particles, mercaptan, and acrylic. Based on a total weight of the barrier coating being as 100 weight percent (wt %), a composition of the photoinitiator can be 1 wt % to 5 wt %, a composition of the scattering particle can be 10 wt % to 30 wt %, a composition of the acrylic can be 20 wt % to 70 wt %, and a composition of the mercaptan can be 15 wt % to 65 wt %. The photoinitiator can be selected from a group consisting of: 1-hydroxycyclohexyl phenyl ketone, benzoyl isopropanol, tribromomethyl phenyl sulfone, and diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide. The scattering particles are surface treated microbeads having a diameter of 0.5 micrometer (μm) to 20 μm that are made of acrylic, silicon dioxide, or polystyrene. The mercaptan can be selected from a group consisting of: 2,2′-(ethylenedioxy) diethanethiol, 2,2′-thiodiethanethiol, trimethylolpropane tris(3-mercaptopropionate), poly(ethylene glycol) dithiol, pentaerythritol tetrakis (3-mercaptopropionate), ethylene glycol bis-mercaptoacetate, and ethyl 2-mercaptopropionate. The acrylic can be selected from a group consisting of: tetrahydrofurfuryl methacrylate, stearyl acrylate, lauryl methacrylate, lauryl acrylate, isobornyl methacrylate, tridecyl acrylate, alkoxylated nonylphenol acrylate, tetraethylene glycol dimethacrylate, polyethylene glycol (600) dimethacrylate, tripropylene glycol diacrylate, ethoxylated (10) bisphenol A dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, ethoxylated (20) trimethylolpropane triacrylate, and pentaerythritol triacrylate.

Furthermore, as shown in Table 1 down below, Table 1 shows different compositions of mercaptan and acrylic in the quantum dot gel layer F1of the present disclosure and testing data thereof. Preferably, for the optical film F, the ratio of mercaptan to acrylic in the quantum dot gel layer F1of the present disclosure can be 3:7, 5:5, or 6:4.

In Table 1, the testing data and measurements are further described as follows: UV intensity: measured by an UV intensity sensor; adhesion: measured through clamping and pulling apart the first shielding layer F2or the second shielding layer F3from the quantum dot gel layer F1by a tensile machine; physical properties of optical film; measured by setting the bending angle of a bending machine and then starting the bending machine; optical properties: measured through having a backlight module shining the optical film F and then measuring the values by a luminance meter; and environmental testing: tested through setting an environmental testing box to a condition of 65° C. and 95% relative humidity, and taking the optical film F out of the environmental testing box every 250 hours for the above test.

In addition, as shown inFIG. 7, the method for manufacturing the optical film F of the present disclosure further includes the following steps:

step S56: performing a cutting process to cut a part of the optical film F into at least one optical film having a required size; and

step S57: performing a winding process to wind up the remaining part of the optical film F for storage.

According to the above implementations, an optical film F is also provided in the present disclosure, the optical film F includes a quantum dot gel layer F1, a first shielding layer F2, a second shielding layer F3, a first plastic layer F4, and a second plastic layer F5. The first shielding layer F2is disposed on one side of the quantum dot gel layer F1. The second shielding layer F3is disposed on another side of the quantum dot gel layer F1. The first plastic layer F4is disposed on a side of the first shielding layer F2facing away from the quantum dot gel layer F1. The second plastic layer F5is disposed on a side of the second shielding layer F3facing away from the quantum dot gel layer F1. The first shielding layer F2and the second shielding layer F3are respectively formed by barrier coating B1and barrier coating B2. The barrier coating B1and the barrier coating B2respectively contains water, IPA, sodium bicarbonate, organic acid, mercaptan, and acrylic.

However, the above-mentioned example is only one of the feasible implementations, and is not meant to limit the scope of the present disclosure.

Second Embodiment

Reference is made toFIG. 8, and is to be read in conjunction withFIG. 1toFIG. 7.FIG. 8is a structural schematic view of a backlight module in the second embodiment of the present disclosure. As shown in the figures, a backlight module S is provided in the second embodiment of the present disclosure, the backlight module S includes a light guide unit1, at least one light emitting unit2, and an optical unit. The light guide unit includes a light entrance side10. The at least one light emitting unit2corresponds to the light entrance side10. The optical unit corresponds to the light entrance side10, and the optical unit is disposed between the light guide unit1and the at least one light emitting unit2. The optical unit includes a quantum dot gel layer F1, a first shielding layer F2, a second shielding layer F3, a first plastic layer F4, and a second plastic layer F5. The first shielding layer F2is disposed on one side of the quantum dot gel layer F1. The second shielding layer F3is disposed on another side of the quantum dot gel layer F1. The first plastic layer F4is disposed on a side of the first shielding layer F2facing away from the quantum dot gel layer F1. The second plastic layer F5is disposed on a side of the second shielding layer F3facing away from the quantum dot gel layer F1. The first shielding layer F2and the second shielding layer F3are respectively formed by barrier coating B1and barrier coating B2. The barrier coating B1and the barrier coating B2respectively contains water, IPA, sodium bicarbonate, organic acid, and acrylic.

For example, the backlight module S provided in the second embodiment of the present disclosure includes the light guide unit1, the at least one light emitting unit2, and the optical unit. The light guide unit1can be an element with a light guide structure, the light emitting unit2can be a light emitting diode (LED) and can include a circuit board, and the optical unit can be the aforementioned optical film F of the present disclosure, but the present disclosure is not limited thereto. The optical unit (i.e., the optical film F) can be arranged on the light entrance side10of the light guide unit1, a light emitting surface of the light emitting unit2corresponds to the light entrance side10of the light guide unit1, and the optical film F is disposed between the light guide unit1and the light emitting unit2.

As mentioned above, based on a total weight of the barrier coating B1or the barrier coating B2being 100 wt %, a composition of the water can be 30 wt % to 85 wt %, a composition of the IPA can be 5 wt % to 15 wt %, a composition of the sodium bicarbonate can be 5 wt % to 15 wt %, a composition of the organic acid can be 5 wt % to 20 wt %, and a composition of the acrylic can be 20 wt % to 80 wt %. The barrier coating B1or B2can be a weak acid.

A material of the first plastic layer F4and the second plastic layer F5can be PET.

However, the above-mentioned example is only one of the feasible implementations, and is not meant to limit the scope of the present disclosure.

Beneficial Effects of the Embodiments

One of the beneficial effects of the optical film F of the present disclosure is that the optical film F is capable of achieving the effect of shielding moisture and oxygen through the technical solutions of “the first shielding layer F2disposed on one side of the quantum dot gel layer F1”, “the second shielding layer F3disposed on another side of the quantum dot gel layer F1”, and “the first shielding layer F2and the second shielding layer F3each being made of the barrier coatings B1and B2, and each of the barrier coatings B1and B2containing water, isopropanol, sodium bicarbonate, organic acid, and acrylic”.

One of the beneficial effects of the backlight module of the present disclosure is that the backlight module is capable of achieving the effect of shielding moisture and oxygen through the technical solutions of “the first shielding layer F2disposed on one side of the quantum dot gel layer F1”, “the second shielding layer F3disposed on another side of the quantum dot gel layer F1”, and “the first shielding layer F2and the second shielding layer F3each being made of the barrier coatings B1and B2, and each of the barrier coatings B1and B2containing water, isopropanol, sodium bicarbonate, organic acid, and acrylic”.

One of the beneficial effects of the method for manufacturing the optical film F of the present disclosure is that the method is capable of achieving the effect of shielding moisture and oxygen through the technical solutions of “coating the barrier coating B1on the first plastic layer F4”, “coating the barrier coating B2on the second plastic layer F5”, “disposing the quantum dot gel layer F1on the second plastic layer F5, so that the barrier coating on the second plastic layer F5is attached to the quantum dot gel layer F1”, “disposing the first plastic layer F4on the quantum dot gel layer F1, so that the barrier coating B1of the first plastic layer F4is attached to the quantum dot gel layer F1”, “performing the curing process to cure the barrier coatings B1and B2on the first plastic layer F4and the second plastic layer F5, so as to form the first shielding layer F2between the first plastic layer F4and the quantum dot gel layer F1, and form the second shielding layer F3between the second plastic layer F5and the quantum dot gel layer F1”, and “each of the barrier coatings B1and B2containing water, isopropanol, sodium bicarbonate, organic acid, and acrylic”.

Furthermore, the optical film F, the backlight module S, and the method for manufacturing the optical film F provided by the present disclosure adopt PET material that are suitably extended through the above-mentioned technical solutions, so as to reduce the moisture and oxygen transmittance of the first plastic layer F4and the second plastic layer F5. In addition, the quantum dot gel layer F1has an enhanced shielding ability, an enhanced bonding between the quantum dot gel layer F1and the barrier coating B1, and an enhanced bonding between the quantum dot gel layer F1and the barrier coating B2, through having the first plastic layer F4and the second plastic layer F5coated with the barrier coating B1and the barrier coating B2, respectively, and the cooperation of quantum dot gel and the scattering particles of the quantum dot gel film F1. Therefore, the optical film F of the present disclosure improves the overall formulation of the conventional quantum dot films, such that the problem of shielding moisture and oxygen is solved without the requirement of additional barrier films. In addition, the first shielding layer F2and the second shielding layer F3of the present disclosure can also be coated or attached to a thinner PET film to reduce an overall thickness of the optical film F, thereby increasing the range of application.