KR102129663B1 - High Brightness film coated phosphor and manufacturing method thereof and LCD structure including thereof - Google Patents

Abstract

The present invention relates to a high-brightness film and a method of manufacturing a high-brightness film in which phosphors are precisely clustered using phase separation, and an LCD structure including the high-brightness film.

Description

High-brightness film coated phosphor and manufacturing method thereof and LCD structure including same{High Brightness film coated phosphor and manufacturing method thereof and LCD structure including thereof}

The present invention relates to a high-brightness film used to improve the brightness of the LCD and a manufacturing method thereof, and an LCD structure including the high-brightness film, wherein the high-brightness film is characterized in that a phosphor is coated.

Among the films coated with the phosphor on the base film, the conventional phosphor-dispersed high-brightness film, specifically, in the case of the high-brightness film in which YAG and LuAG phosphors are precisely dispersed in the coating layer, the luminance enhancement ratio compared to the quantum dot (QD) film There is a problem in that it is impossible to further improve the brightness of this 30-40% or so.

In addition, when the luminance of the phosphor-dispersed high-brightness film is further improved, the Y value of the front color coordinate exceeds the target value (a specification desired by the customer) of 0.32. When the Y value exceeds 0.32, the light shifts toward the yellow light.

In addition, the light used for the LCD light source is white, and the white light is made of a mixture of blue light and yellow light, and the conventional phosphor-dispersed high-brightness film is yellow light due to scattering of the phosphor that receives blue light. There is a problem that it is not easy to improve the additional luminance due to the increase in the Y value of the front color coordinate due to the increase in the value.

The present invention can be applied in place of the LED chip to solve the heat and power consumption problems caused by the additional application of the LED chip in order to respond to high-brightness needs such as Full UHD (8K) TV and signage display. The problem is to provide a high-brightness film and a manufacturing method therefor.

In addition, a problem to be solved is to provide a high-brightness film superior in brightness improvement effect compared to a high-brightness film or a quantum dot (QD) film in which phosphors are precisely dispersed and used to increase the brightness of a conventional liquid crystal display device and a method for manufacturing the same. do.

As a means for solving the above-mentioned problems,

The phosphor coating high-brightness film of the present invention, a phosphor coating layer is formed on one side of the base film, the phosphor coating layer includes at least one phosphor selected from resins, polymer materials and YAG phosphors and LuAG-based phosphors, and the resin and The polymer material is phase-separated, and the phosphors are clustered.

In addition, the size of the phosphor cluster is characterized in that 30 to 500 ㎛.

In addition, the distance between the phosphor groups is characterized in that 10 to 200 ㎛.

In addition, the polymer materials include Cellulose acetate butyrate (CAB), Cellulose acetate propionate (CAP), Poly(vinyl alcohol) (PVA), Poly(methyl methacrylate) (PMMA), Polystyrene (PS) and PS(PMMA) (Poly(styrene-styrene) co-methyl methacrylate)).

In addition, YAG-based phosphors are Y ₃ A1 ₅ 0 ₁₂ : Ce ^{3 +} (YAG:Ce), Tb ₃ A1 ₅ 0 ₁₂ :Ce ^{3 +} (TAG:Ce), Ca ₃ (Sc,Mg) ₂ Si ₃ O ₁₂ :Ce ³⁺ and Y ₃ Mg ₂ AlSi ₂ O ₁₂ :Ce ^{3 +} is at least any one selected, and the LuAG-based phosphor is Lu ₃ Al ₅ O ₁₂ :Ce ^{3 +} , Tb ₃ Al ₅ O ₁₂ :Ce ^{3 +} and It characterized in that it is at least one selected from Lu ₂ CaMg ₂ Si ₃ O ₁₂ :Ce ^{3 +} .

In addition, the molecular weight of the polymer material is characterized in that 40,000 to 300,000.

In addition, the content of the polymer material is characterized in that 0.2 to 3.0% by weight compared to the resin.

In addition, a back coating layer is formed on the other surface of the base film, and the back coating layer is characterized by including PMMA particles or PMMA particles and an antistatic agent.

In addition, the resin is characterized in that at least one selected from acrylate, urethane acrylate and epoxy acrylate.

The method for manufacturing the phosphor-coated high-brightness film of the present invention comprises: (1) preparing a resin comprising at least one selected from acrylate, urethane acrylate, and epoxy acrylate; (2) 0.2 to 3.0 wt% of the resin is added to the resin, which is not mixed with the resin, to the resin, and at least one phosphor selected from YAG phosphors and LuAG-based phosphors is added to 10 to 60 wt% of the resin to be coated. Preparing a composition; (3) adding an acetate-based solvent to the coating composition to prepare a coating solution; (4) after applying the coating solution on one surface of the base film, drying the solvent to form a phosphor cluster; characterized in that it comprises a.

In addition, the polymer materials include Cellulose acetate butyrate (CAB), Cellulose acetate propionate (CAP), Poly(vinyl alcohol) (PVA), Poly(methyl methacrylate) (PMMA), Polystyrene (PS) and PS(PMMA) (Poly(styrene-styrene) co-methyl methacrylate)).

In addition, the molecular weight of the polymer material is characterized in that 40,000 to 300,000.

In addition, the size of the phosphor cluster is characterized in that 30 to 500 ㎛.

In addition, the distance between the phosphor groups is characterized in that 10 to 200 ㎛.

In addition, after the step (4), (5) forming a back coating layer on the other side of the base film; characterized in that it further comprises a.

The LCD structure of the present invention is characterized by a direct-type LCD structure in which a reflector, a blue LED, the high-brightness film, a prism, a double bright enhancement film (DBEF) and a liquid crystal panel are sequentially stacked.

In the LCD structure of the present invention, a reflector, a light guide plate, the high-brightness film, a prism, a double bright enhancement film (DBEF) and a liquid crystal panel are sequentially stacked, and the blue LED is an edge type LCD structure located on the side of the light guide plate. do.

The phosphor-coated high-brightness film of the present invention has an effect of suppressing an increase in front color coordinate Y value due to yellow light scattered by the phosphor by precisely clustering the phosphors.

In addition, the phosphors are precisely clustered to form white light by appropriately combining blue light and yellow light, and thus, there is an effect of further improving luminance compared to a high-brightness film coated with a conventional phosphor.

In addition, the phosphors are precisely clustered to form a white light by appropriately combining blue light and yellow light, thereby improving the brightness of 50 to 60% compared to a conventional quantum dot film.

1 is a schematic view showing a conventional phosphor-dispersed high-brightness film.
Figure 2 is a schematic view showing a phosphor cluster-type high-brightness film of the present invention, (a) is made of a base film and a phosphor coating layer, (b) shows a case made of a base film, a phosphor coating layer and a back coating layer.
3 is a schematic diagram of an edge-type LCD structure including the high-brightness film of the present invention.
4 is a schematic diagram of a direct-type LCD structure including the high-brightness film of the present invention.
5 is a photograph showing dispersion of phosphor particles in a conventional phosphor-dispersed high-brightness film.
6 is a photograph showing a cluster of phosphor particles of the phosphor cluster-type high-brightness film of the present invention.

Hereinafter, the present invention will be described in detail.

In the present invention, a phosphor coating layer is formed on one surface of a base film, and the phosphor coating layer includes at least one phosphor selected from a resin, a polymer material, and a YAG phosphor and a LuAG-based phosphor, and the resin and the polymer material are phase-separated, The phosphor relates to a phosphor-coated high-brightness film, which is characterized by forming a cluster.

In addition, the present invention (1) acrylate, a urethane acrylate and an epoxy acrylate selected from at least one selected from the step of preparing a resin;

(2) 0.2 to 3.0 wt% of the resin is added to the resin, which is not mixed with the resin, to the resin, and at least one phosphor selected from YAG phosphors and LuAG-based phosphors is added to 10 to 60 wt% of the resin to be coated. Preparing a composition; (3) adding an acetate-based solvent to the coating composition to prepare a coating solution; (4) after applying the coating solution on one surface of the base film, drying the solvent to form a phosphor cluster; It relates to a method for producing a phosphor-coated high-brightness film comprising a.

In addition, the present invention relates to a direct-type LCD structure characterized in that the reflector, Blue LED, the phosphor-coated high-brightness film, prism, DBEF, and liquid crystal panel are sequentially stacked.

In addition, the present invention relates to an edge type LCD structure characterized in that a reflective plate, a light guide plate, the phosphor-coated high-brightness film, a prism, a DBEF, and a liquid crystal panel are sequentially stacked, and the blue LED is located on the side of the light guide plate.

In addition, the present invention relates to a direct-type LCD structure characterized by laminating a high-brightness film, a prism, DBEF and a liquid crystal panel according to a method of manufacturing a reflector, a blue LED, and the phosphor-coated high-brightness film.

In addition, the present invention is a reflective plate, a light guide plate, a high-brightness film, a prism, DBEF and a liquid crystal panel according to the method of manufacturing the phosphor-coated high-brightness film are sequentially stacked, Blue LED is an edge type LCD characterized in that located on the side of the light guide plate It's about structure.

Referring to Figure 2 (a), the phosphor-coated high-brightness film 200 of the present invention is characterized in that the phosphor coating layer 30 is formed on one surface of the base film 20. In addition, in another embodiment of the present invention, the phosphor-coated high-brightness film 200 may be further formed with a back coating layer 10 on the other surface of the base film 20 as shown in FIG. 2(b).

PET, TAC, PC, Polyimide, Acryl film, etc. may be used as the base film 20, and preferably, a PET film may be used.

The phosphor coating layer 30 of the present invention includes the phosphor 50. In the present invention, at least one phosphor selected from YAG (Yittrium aluminum garnet)-based phosphors and LuAG (Lutetium aluminum garnet)-based phosphors that emit yellow fluorescence may be used to improve luminance and color reproduction.

Specifically, in the present invention, the YAG-based phosphor is Y ₃ A1 ₅ 0 ₁₂ : Ce ^{3 +} (YAG:Ce), Tb ₃ A1 ₅ 0 ₁₂ :Ce ³⁺ (TAG:Ce), Ca ₃ (Sc,Mg) ₂ It is preferable that it is at least any one selected from Si ₃ O ₁₂ :Ce ³⁺ and Y ₃ Mg ₂ AlSi ₂ O ₁₂ :Ce ^{3 +} .

Further, in the present invention, the LuAG-based phosphor is at least one selected from Lu ₃ Al ₅ O ₁₂ :Ce ^{3 +} , Tb ₃ Al ₅ O ₁₂ :Ce ^{3 +} and Lu ₂ CaMg ₂ Si ₃ O ₁₂ :Ce ³⁺ . desirable.

The phosphor coating layer 30 of the present invention contains a polymer material.

The polymer material is CAB (Cellulose acetate butyrate), CAP (Cellulose acetate propionate), PVA (Poly(vinyl alcohol)), PMMA (Poly(methyl methacrylate)), PS (Polystyrene) and PS-PMMA (Poly(styrene-co-styrene) -methyl methacrylate)), and it is particularly preferable to use CAP.

The phosphor coating layer 30 of the present invention includes a resin 60. The resin 60 means a polymer resin. The resin 60 may be at least one selected from acrylate, urethane acrylate, and epoxy acrylate.

The polymer material is used for phase separation, and is characterized in that the polymer material in the phosphor coating layer and the resin 60 are phase-separated without being mixed with each other. The present invention is characterized by forming a precise population of phosphors by using a phenomenon in which the immiscible resin 60 and the polymer material phase-separate as the solvent volatilizes. When the solvent is volatilized, the interaction between the phase-separated polymer material and the phosphor is increased, so that the phosphor is constantly clustered around the phase-separated polymer material to form a phosphor cluster.

As described above, the size of the phosphor cluster and the distance (Sm) between the phosphor clusters can be precisely controlled using the phase separation technique.

In addition, when the population of phosphors is formed as described above, blue light and yellow light are appropriately combined as compared to the case in which the phosphors are dispersed, and thus an additional luminance increase effect may be obtained. Specifically, it is possible to obtain a brightness improvement effect of 50 to 60% compared to a quantum dot film. In addition, there is an effect that can suppress the increase in the front color coordinate Y value due to the scattering of light generated by the phosphor receiving the blue light.

The polymer material may be added 0.2 to 3.0% by weight relative to the resin. When adding less than 0.2% by weight, the phase separation is weak and it is difficult to form a phosphor cluster, and when it is added above 3.0% by weight, the phase separation is too strong to control the formation of phosphor cluster.

The polymer material preferably has a molecular weight of 40,000 to 300,000. When the molecular weight is less than 40,000, phase separation is difficult to occur, and when the molecular weight is more than 300,000, it is difficult to dissolve in a solvent, and workability is deteriorated.

The size of the phosphor cluster of the phosphor-coated high-brightness film of the present invention may be 30 to 500 μm. If it is less than 30㎛, the phase separation domain size is small, so it is difficult to exert a luminance improvement effect due to the phase separation effect. If it is more than 500㎛, the phase separation domain control is difficult, so the Y value due to scattering of the phosphor is difficult to apply due to the scattering of the phosphor .

The distance between the phosphor clusters of the phosphor-coated high-brightness film of the present invention may be 10 to 200㎛. If it is less than 10 μm, the phase separation effect is insignificant, so it is difficult to expect improvement in luminance. If it is more than 200 μm, the Y value due to scattering of the phosphor increases, making application difficult.

The back coating layer 10 of the present invention contains PMMA particles or PMMA particles and an antistatic agent.

By providing the unevenness to the back surface of the high-brightness film by the particles contained in the back coating layer 10, it prevents blocking with other sheets, thereby improving workability and preventing static electricity generated due to process friction.

The coating crude liquid used in the back coating layer 10 is made of urethane acrylate oligomer, monofunctional monomer, photoinitiator, leveling agent, dispersant and PMMA particles.

It is preferable that the PMMA particles contain 0.1 to 5 wt% of the total back coating layer. If it is less than 0.1 wt%, sufficient unevenness cannot be formed on the back side of the optical film, and when it is more than 5 wt%, transmitted light loss due to high haze occurs, so the content of PMMA particles is adjusted to adjust the haze of the back coating layer to 1 to 20%. It is desirable to do.

In addition, an anti-static agent may be added to the back coating layer 10 as an additive, if necessary. The surface resistance can be adjusted by adding the antistatic agent, and the antistatic agent is preferably included in an amount of 0.01 to 3 wt% compared to the entire back coating layer. When the content of the antistatic agent is less than 0.01 wt%, the surface resistance for preventing static electricity is insufficient, and when it exceeds 3 wt%, it results in adding an excess amount necessary, and the surface resistance is added by adding 0.01 to 3 wt% of the antistatic agent. It is desirable to adjust it to be in the range of 10 ¹⁰ ~10 ¹² Ohm/□. This is because, when the surface resistance is 10 ¹⁰ ~10 ¹² Ohm/□, it is possible to prevent obstacles in the dynamic state of the film, and the effect of immediately decreasing the charging phenomenon after charging is effective.

The back coating can use a method such as bar coating or slot-die coating.

The thickness of the back coating layer 10 during the back coating is preferably 1 to 10㎛. When the thickness is less than 1 μm, it is difficult to prevent blocking because sufficient unevenness is not formed on the back surface of the optical film, and when it is more than 10 μm, a problem of transmitted light loss due to high haze occurs.

The method for manufacturing the phosphor-coated high-brightness film of the present invention includes the following steps (1) to (4).

(1) preparing a resin comprising at least one selected from acrylate, urethane acrylate and epoxy acrylate;

(2) 0.2 to 3.0 wt% of the resin is added to the resin, which is not mixed with the resin, to the resin, and at least one phosphor selected from YAG phosphors and LuAG-based phosphors is added to 10 to 60 wt% of the resin to be coated. Preparing a composition;

(3) adding an acetate-based solvent to the coating composition to prepare a coating solution;

(4) after applying the coating solution on one surface of the base film, drying the solvent to form a phosphor cluster;

Furthermore, after the step (4), (5) may further include the step of forming a back coating layer on the other surface of the base film.

The LCD structure including the high-brightness film of the present invention can be both a direct type or an edge type.

In the case of a direct-type LCD structure, a reflector, a blue LED, the high-brightness film or a high-brightness film manufactured by the above manufacturing method, a prism, DBEF, and a liquid crystal panel are sequentially stacked.

In the case of an edge type LCD structure, a reflector, a light guide plate, the high brightness film or a high brightness film manufactured by the above manufacturing method, a prism, DBEF and a liquid crystal panel are sequentially stacked, and the blue LED is located on the side of the light guide plate.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. The following examples are only for the detailed description of the invention, and it is clearly intended that the scope of the rights is not intended to be limited thereby.

Example One

Cytec Ebecryl 1290 (molecular weight: 500-1000), a 6-functional urethane acrylate oligomer, and 1 type of M370 monomer from Miwon Corporation, 0.2% by weight of cellulose acetate butyrate (CAB) with a molecular weight of 40,000 , The photoinitiator Ikacure 184D was added to 1.0% by weight of the resin content and 40% by weight of the YAG phosphor to the resin content to prepare a coating composition.

The coating composition was prepared by adding propylene glycol monomethyl ether acetate as an acetate-based solvent (solid content 20%) to the coating composition, and then coated on a PET film. Thereafter, the organic solvent was removed by drying to form an ultraviolet curable resin through a UV curing process, and the finally obtained high-brightness film was wound.

Example 2

A high-brightness film was prepared in the same manner as in Example 1, except that cellulose acetate butyrate (CAB) having a molecular weight of 40,000 was used in an amount of 1.0% by weight based on the resin content.

Example 3

A high-brightness film was prepared in the same manner as in Example 1, except that cellulose acetate butyrate (CAB) having a molecular weight of 40,000 was used in an amount of 2.0% by weight based on the resin content.

Example 4

A high-brightness film was prepared in the same manner as in Example 1, except that cellulose acetate butyrate (CAB) having a molecular weight of 40,000 was used in an amount of 3.0 wt% based on the resin content.

Example 5

A high-brightness film was prepared in the same manner as in Example 1, except that cellulose acetate butyrate (CAB) having a molecular weight of 300,000 was used in an amount of 0.2% by weight based on the resin content.

Example 6

A high-brightness film was prepared in the same manner as in Example 1, except that cellulose acetate butyrate (CAB) having a molecular weight of 300,000 was used in an amount of 1.0% by weight based on the resin content.

Example 7

A high-brightness film was prepared in the same manner as in Example 1 except that cellulose acetate butyrate (CAB) having a molecular weight of 300,000 was used in an amount of 2.0% by weight based on the resin content.

Example 8

A high-brightness film was prepared in the same manner as in Example 1, except that cellulose acetate butyrate (CAB) having a molecular weight of 300,000 was used in an amount of 3.0% by weight based on the resin content.

Example 9

Cytec Ebecryl 1290 (molecular weight: 500~1000), a 6-functional urethane acrylate oligomer, and 1 type of M370 monomer from Miwon Corporation, 0.2% by weight of cellulose acetate butyrate (CAB) with a molecular weight of 40,000 , The photoinitiator Ikacure 184D was added to 1.0% by weight of the resin content and 40% by weight of the LuAG phosphor to the resin content to prepare a coating composition.

The coating composition was prepared by adding propylene glycol monomethyl ether acetate as an acetate-based solvent (solid content 20%) to the coating composition, and then coated on a PET film. Thereafter, the organic solvent was removed by drying to form an ultraviolet curable resin through a UV curing process, and the finally obtained high-brightness film was wound.

Example 10

A high-brightness film was prepared in the same manner as in Example 9, except that cellulose acetate butyrate (CAB) having a molecular weight of 40,000 was used in an amount of 1.0% by weight based on the resin content.

Example 11

A high-brightness film was prepared in the same manner as in Example 9, except that cellulose acetate butyrate (CAB) having a molecular weight of 40,000 was used in an amount of 2.0% by weight based on the resin content.

Example 12

A high-brightness film was prepared in the same manner as in Example 9, except that cellulose acetate butyrate (CAB) having a molecular weight of 40,000 was used in an amount of 3.0% by weight based on the resin content.

Example 13

A high-brightness film was prepared in the same manner as in Example 9, except that cellulose acetate butyrate (CAB) having a molecular weight of 300,000 was used in an amount of 0.2% by weight based on the resin content.

Example 14

A high-brightness film was prepared in the same manner as in Example 9, except that cellulose acetate butyrate (CAB) having a molecular weight of 300,000 was used in an amount of 1.0% by weight based on the resin content.

Example 15

A high-brightness film was prepared in the same manner as in Example 9, except that cellulose acetate butyrate (CAB) having a molecular weight of 300,000 was used in an amount of 2.0% by weight based on the resin content.

Example 16

A high-brightness film was prepared in the same manner as in Example 9, except that cellulose acetate butyrate (CAB) having a molecular weight of 300,000 was used in an amount of 3.0% by weight based on the resin content.

Comparative example One

In a resin blended with one of the two functional urethane acrylic oligomers, Cytec's Ebecryl 284 (molecular weight 1000 to 2000) and one Cytec's IBOA monomer, the YAG phosphor is 40% by weight compared to the resin content and the photoinitiator Igacure 184D is the resin content. The coating composition was prepared by adding 1.0 wt% of the contrast.

After the coating composition was applied on a PET film, an ultraviolet curable resin was formed through a UV curing process, and the finally obtained high-brightness film was wound up.

Comparative example 2

A high-brightness film was prepared in the same manner as in Example 1, except that cellulose acetate butyrate (CAB) having a molecular weight of 40,000 was used in an amount of 0.1% by weight based on the resin content.

Comparative example 3

A high-brightness film was prepared in the same manner as in Example 1, except that 4.0% by weight of cellulose acetate butyrate (CAB) having a molecular weight of 40,000 was used.

Comparative example 4

Existing Quantum Dot film is used.

Comparative example 5

Cytec Ebecryl 1290 (molecular weight: 500-1000), a 6-functional urethane acrylate oligomer, and 1 kind of M370 monomer from Miwon Corporation, 0.2% by weight of cellulose acetate butyrate (CAB) having a molecular weight of 30,000 , The photoinitiator Ikacure 184D was prepared by adding 1.0% by weight of the resin content and 40% by weight of the YAG phosphor to the resin content.

The coating composition was prepared by adding propylene glycol monomethyl ether acetate as an acetate-based solvent (solid content 20%) to the coating composition, and then coated on a PET film. Thereafter, the organic solvent was removed by drying to form an ultraviolet curable resin through a UV curing process, and the finally obtained high-brightness film was wound.

Comparative example 6

Attempt to prepare a coating solution by adding cellulose acetate butylate (CAB) having a molecular weight of 400,000 to propylene glycol monomethyl ether acetate as an acetate-based solvent using 1.0% by weight of the resin content (solid content 20%), but cellulose having a molecular weight of 400,000 Acetate butyrate (CAB) was not dissolved, so the coating solution could not be prepared.

Luminance measurement method

In order to measure the luminance when using the high-brightness film of the present invention, after disassembling the Quantum Dot TV of Samsung Electronics with a Blue LED chip BLU (Back Light Unit), Blue BLU, high-brightness film, POP (Prism on Prism), DBEF and LCD panel At this time, the luminance was measured by stacking with a high-brightness film, and one high-brightness film or quantum dot film selected from Examples 1 to 16 and Comparative Examples 1 to 6 of the present invention was used. 1] and [Table 2].

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 CAB molecular weight 40,000 40,000 40,000 40,000 300,000 300,000 300,000 300,000 Cab content (%) 0.2 1.0 2.0 3.0 0.2 1.0 2.0 3.0 Luminance (nit) 648 650 656 654 649 651 656 652 Relative luminance ratio (%) 154.3 154.8 156.2 155.7 154.5 155.0 156.2 155.2 X 0.2755 0.2760 0.2745 0.2748 0.2756 0.2761 0.2744 0.2743 Y 0.2960 0.2954 0.2965 0.2966 0.2959 0.2953 0.2960 0.2961 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 CAB molecular weight 40,000 40,000 40,000 40,000 300,000 300,000 300,000 300,000 Cab content (%) 0.2 1.0 2.0 3.0 0.2 1.0 2.0 3.0 Luminance (nit) 649 651 657 655 650 651 657 652 Relative luminance ratio (%) 154.5 155.0 156.4 156.0 154.8 155.0 156.4 155.2 X 0.2655 0.2660 0.2645 0.2648 0.2656 0.2661 0.2644 0.2643 Y 0.2962 0.2955 0.2964 0.2967 0.2962 0.2954 0.2962 0.2963

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 CAB molecular weight - 40,000 40,000 - 30,000 400,000 Cab content (%) - 0.1 4.0 - 0.2 1.0 Luminance (nit) 594 596 660 420 590 No phase separation coating solution Luminance
Relative ratio (%) 141.4 141.9 157.1 100 140.5 X 0.2765 0.2760 0.2849 0.2750 0.2746 Y 0.2948 0.2948 0.3260 0.2778 0.2955

As a result of the luminance measurement, the phosphor clustered high-brightness film (Examples 1 to 16) using the phase separation of the present invention has a brightness improvement of 10% or more compared to a phosphor-dispersed high-brightness film (Comparative Example 1) in which a conventional phosphor is precisely dispersed. It can be seen that, compared to the quantum dot film (Comparative Example 4), the luminance is improved by 50% or more, and at the same time, the front color coordinate Y value is also adjusted within the target value (Y = 0.32 or less).

Also, as in Comparative Example 2, if the CAB content is too low, the phase separation is weak, so the phosphor clusters are difficult to improve the brightness, and when the CAB content is too high, as in Comparative Example 3, the phase separation is strong and particle control is difficult to control. Is increased, but it can be seen that a problem arises that the front color coordinate Y value also increases.

10: back coating layer
20: base film
30: phosphor coating layer
50: phosphor
60: resin
100: phosphor dispersion-type high-brightness film
200: phosphor cluster type high brightness film
300: reflector
400: BLUE LED
500: light guide plate
600: POP
700: DBEF
800: liquid crystal panel

Claims (19)

A phosphor coating layer is formed on one surface of the base film, and the phosphor coating layer includes at least one phosphor selected from resins, polymer materials, and YAG (Yittrium aluminum garnet) phosphors and LuAG (Lutetium aluminum garnet) phosphors. The resin and the polymer material are phase-separated, and the phosphors are clustered, but the molecular weight of the polymer material is 40,000 to 300,000, and the content of the polymer material is 0.2 to 3.0% by weight compared to the resin, the phosphor coating high-brightness film. The phosphor-coated high-brightness film according to claim 1, wherein the phosphor cluster has a size of 30 to 500 μm. The phosphor-coated high-brightness film according to claim 1, wherein the distance between the phosphor clusters is 10 to 200 μm. The method of claim 1, wherein the polymer material is CAB (Cellulose acetate butyrate), CAP (Cellulose acetate propionate), PVA (Poly(vinyl alcohol)), PMMA (Poly(methyl methacrylate)), PS (Polystyrene) and PS-PMMA ( Phosphor coating high brightness film, characterized in that any one selected from poly (styrene-co-methyl methacrylate). According to claim 1, YAG (Yittrium aluminum garnet) phosphor is Y ₃ A1 ₅ 0 ₁₂ : Ce ³⁺ (YAG:Ce), Tb ₃ A1 ₅ 0 ₁₂ :Ce ³⁺ (TAG:Ce), Ca ₃ ( Sc,Mg) ₂ Si ₃ O ₁₂ :Ce ³⁺ and Y ₃ Mg ₂ AlSi ₂ O ₁₂ :Ce ³⁺ , and LuAG (Lutetium aluminum garnet) phosphor is Lu ₃ Al ₅ O ₁₂ :Ce ³⁺ , Tb ₃ Al ₅ O ₁₂ :Ce ³⁺ and Lu ₂ CaMg ₂ Si ₃ O ₁₂ :Ce ³⁺ is selected from at least one selected from phosphor coating high brightness film. delete delete The phosphor-coated high-brightness film of claim 1, wherein a back coating layer is formed on the other surface of the base film, and the back coating layer comprises PMMA particles or PMMA particles and an antistatic agent. The phosphor-coated high-brightness film according to claim 1, wherein the resin is at least one selected from acrylate, urethane acrylate, and epoxy acrylate. (1) preparing a resin comprising at least one selected from acrylate, urethane acrylate, and epoxy acrylate;
(2) 0.2 to 3.0% by weight of a polymer material that is not mixed with the resin is added to the resin, and at least one phosphor selected from YAG (Yittrium aluminum garnet) phosphor and LuAG (Lutetium aluminum garnet) phosphor is added. 10 to 60% by weight compared to the resin to prepare a coating composition;
(3) adding an acetate-based solvent to the coating composition to prepare a coating solution;
(4) after applying the coating solution on one surface of the base film, drying the solvent to form a phosphor cluster;
Including, but the molecular weight of the polymer material is 40,000 to 300,000, characterized in that the phosphor coating method for producing a high-brightness film. The method of claim 10, wherein the polymer material is CAB (Cellulose acetate butyrate), CAP (Cellulose acetate propionate), PVA (Poly (vinyl alcohol)), PMMA (Poly (methyl methacrylate)), PS (Polystyrene) and PS-PMMA (Poly (styrene-co-methyl methacrylate)) method for producing a phosphor-coated high-brightness film, characterized in that any one selected from. delete The method of claim 10, wherein the phosphor cluster has a size of 30 to 500 μm. 11. The method of claim 10, wherein the distance between the groups of phosphors is 10 to 200 μm. The method according to claim 10, further comprising (5) after the step, (5) forming a back coating layer on the other surface of the base film; Direct type, characterized in that the reflector, blue LED, high brightness film of any one of claims 1 to 5, 8, 9, prism, double bright enhancement film (DBEF) and liquid crystal panel are sequentially stacked. LCD structure. Reflector, light guide plate, high brightness film of any one of claims 1 to 5, 8, and 9, a prism, a double bright enhancement film (DBEF) and a liquid crystal panel are sequentially stacked, and a blue LED is a side surface of the light guide plate Edge type LCD structure, characterized in that located in the. Reflector, Blue LED, claim 10, claim 11, claim 13 to claim 15, wherein the high-brightness film, prism, DBEF (Double Bright Enhancement Film) and liquid crystal panel manufactured by any one of the manufacturing methods are laminated in this order. Direct-type LCD structure. High-brightness film, prism, double bright enhancement film (DBEF) and liquid crystal panel produced by any one of the manufacturing methods of the reflector, light guide plate, claim 10, 11, 13 to 15 are sequentially stacked, Blue LED is an edge type LCD structure, characterized in that located on the side of the light guide plate.

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