KR102434447B1 - Laminated optical film and display device including the same - Google Patents

Abstract

A composite film and a display device including the same are disclosed. The composite film includes a color conversion filter film and a polarizing film.
The color conversion filter film includes a base film, a color conversion layer and a color filter layer.
The color filter layer is disposed between the base film and the color conversion layer.
The color conversion layer is disposed between the color filter layer and the polarizing film.

Description

Composite film and display device including same

The present invention relates to a composite film and a display device including the same.

A display device is a device that visually displays data. As the information society develops, the demand for a display device for displaying an image is increasing in various forms, and in recent years, a liquid crystal display (LCD) and an organic light emitting diode (OLED) A display device is mainly used as a display device.

A color filter transmits, for example, light of a red wavelength band, light of a green wavelength band, and light of a blue wavelength band from light emitted from a light source, and absorbs other wavelengths of light, so that the display device is red and green. , it is an optical component that enables the realization of blue.

Color filters are generally widely used in liquid crystal displays, but are also used in color reproduction of white organic light emitting diode displays. Since the color filter absorbs light of a wavelength band other than light of a wavelength band of a predetermined color to be expressed, light transmittance or light efficiency may be reduced.

The present invention is to provide a flexible composite film that can be used in a flexible device.

An object of the present invention is to provide a composite film capable of improving the viewing angle image quality of a display device.

An object of the present invention is to provide a composite film that can be used in a flexible display device and can improve the viewing angle image quality of the flexible display.

An object of the present invention is to provide a composite film with improved light efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device with improved viewing angle quality.

An object of the present invention is to provide a display device with a reduced driving voltage.

An object of the present invention is to provide a display device with improved viewing angle image quality and reduced driving voltage.

An object of the present invention is to provide a display device with improved light efficiency.

The problems to be solved by the invention are not limited to those mentioned above, and the problems not mentioned will be clearly understood by those skilled in the art from the following description.

The composite film according to an embodiment includes a color conversion filter film and a polarizing film.

The color conversion filter film includes a base film, a color conversion layer and a color filter layer. The color conversion layer absorbs light in a short wavelength band and emits light in a long wavelength band. The color filter layer transmits only light in a specific wavelength band and absorbs light in the other wavelength band.

The color filter layer is disposed between the base film and the color conversion layer.

The color conversion layer is disposed between the color filter layer and the polarizing film.

The polarizing film transmits only light that vibrates in the same direction as the polarization axis, and absorbs or reflects other light to create polarized light in a specific direction. The polarizing film is laminated or bonded on the color conversion filter film. For example, the polarizing film may be laminated or bonded on the color conversion layer.

In the composite film, the polarizing film may be a light absorbing polarizing film and/or a light reflective polarizing film.

The light reflective polarizing film transmits only light that vibrates in the same direction as the polarization axis, and reflects other light to create polarized light in a specific direction. The light-absorbing polarizing film transmits only light that vibrates in the same direction as the polarization axis and absorbs other light to create polarized light in a specific direction.

When the polarizing film includes both the light absorbing polarizing film and the light reflective polarizing film, the light reflective polarizing film is disposed between the color conversion layer and the light absorbing polarizing film. In this case, the color filter layer is disposed between the base film and the color conversion layer.

In the composite film, the base film may be a low-reflection film. The low-reflective film has a low average reflectance to minimize glare due to external light reflection, for example, the average reflectance may be less than 3%, less than 2%, less than 1%, or less than 0.5%.

In the composite film, when the polarizing film includes the light reflective polarizing film, the average reflectance of the base film is lower than that of the light reflective polarizing film.

For example, in the composite film, the color filter layer may include a first color filter unit, a second color filter unit, and a third color filter unit emitting different colors, and the color conversion layer may include It may include a first color conversion unit disposed on the first color filter unit and a second color conversion unit disposed on the second color filter unit.

Also, for example, in the composite film, the color filter layer may include a first color filter unit, a second color filter unit, and a third color filter unit that emit different colors, and the color conversion layer includes: It may include a first color conversion unit disposed on the first color filter unit and a second color conversion unit disposed on the second color filter unit.

A display device according to an embodiment includes a composite film and a light source emitting light to the composite film.

The composite film includes a color conversion filter film and a polarizing film.

The color conversion filter film includes a base film, a color conversion layer and a color filter layer.

The color filter layer is disposed between the base film and the color conversion layer.

The color conversion layer is disposed between the color filter layer and the polarizing film.

The base film is disposed far from the light source. The polarizing film is disposed closer to the light source than the base film.

The polarizing film is laminated or bonded on the color conversion filter film. For example, the polarizing film may be laminated or bonded on the color conversion layer.

In the display device, the polarizing film may be a light absorbing polarizing film and/or a light reflecting polarizing film.

When the polarizing film includes both the light absorbing polarizing film and the light reflective polarizing film, the light reflective polarizing film is disposed between the color conversion layer and the light absorbing polarizing film. In this case, the color filter layer is disposed between the base film and the color conversion layer.

In the display device, the base film may be a low-reflection film. The low-reflective film has a low average reflectance to minimize glare due to external light reflection, for example, the average reflectance may be less than 3%, less than 2%, less than 1%, or less than 0.5%.

In the display device, when the polarizing film includes the light reflective polarizing film, the average reflectance of the base film is lower than that of the light reflective polarizing film.

In the display device, the color filter layer may include a first color filter unit, a second color filter unit, and a third color filter unit emitting different colors, and the color conversion layer may include the first color filter. It may include a first color conversion unit disposed on the unit and a second color conversion unit disposed on the second color filter unit.

Also, for example, in the display device, the color filter layer may include a first color filter unit, a second color filter unit, and a third color filter unit that emit different colors, and the color conversion layer may include: , a first color conversion unit disposed on the first color filter unit and a second color conversion unit disposed on the second color filter unit.

Meanwhile, the display device may be an organic light emitting diode display device or a liquid crystal display device.

When the display device is, for example, a liquid crystal display device, the display device further includes a liquid crystal layer. The liquid crystal layer is disposed between the composite film and the light source. In this case, the polarizing film may be disposed between the color conversion filter film and the liquid crystal layer. In this case, when the polarizing film includes both the light absorbing polarizing film and the light reflective polarizing film, the light reflective polarizing film is disposed between the color conversion layer and the light absorbing polarizing film and the light absorption type polarizing film is disposed between the light reflection type polarizing film and the liquid crystal layer. do.

The liquid crystal layer contains liquid crystal molecules. The liquid crystal molecules may be liquid crystal molecules having negative dielectric anisotropy and/or liquid crystal molecules having positive dielectric anisotropy.

The liquid crystal layer may include, for example, a liquid crystal capsule. The liquid crystal capsule is filled with liquid crystal molecules inside the capsule.

The light source may emit blue light to the composite film via the liquid crystal layer. In this case, the color filter film may include a red filter unit, a green filter unit, and a blue filter unit, and the color conversion film includes: a red conversion unit and the green filter unit disposed to overlap the red filter unit; It may be composed of a green conversion unit arranged to overlap.

The details of other embodiments are included in the detailed description and drawings.

The invention can provide a flexible composite film that can be used in a flexible device.

The present invention may provide a composite film capable of improving the viewing angle image quality of a display device.

The present invention can provide a composite film that can be used in a flexible display device and can improve the viewing angle image quality of the flexible display.

The invention can provide a composite film with improved light efficiency.

The present invention may provide a display device with improved viewing angle image quality.

The present invention can provide a display device with a reduced driving voltage.

The present invention can provide a display device with improved viewing angle image quality and reduced driving voltage.

The present invention can provide a display device with improved light efficiency.

Effects according to the invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a schematic exploded view of a display device including a composite film.
FIG. 2 is a schematic enlarged view of area A of FIG. 1 .
3 and 4 schematically show a manufacturing process of the composite film used in the display device of FIG. 1 .
FIG. 5 schematically illustrates a process of manufacturing the display device of FIG. 1 by using the composite film of FIG. 3 .

Advantages and features of the invention, and a method for achieving them will become apparent with reference to the embodiments and experimental examples described in detail below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only for easy understanding of the spirit of the technology disclosed in this specification, and should not be construed as limiting the spirit of the technology by the accompanying drawings.

In addition, the invention is not limited to the content disclosed below, but can be implemented in various forms, and the content disclosed below allows the disclosure of the invention to be complete, and the invention belongs to those of ordinary skill in the art to which the invention pertains. It is provided to fully indicate the scope of the invention, and the invention is only defined by the scope of the claims.

When it is determined that a detailed description of a related known technology may obscure the gist of the technology, the detailed description thereof may be omitted.

Like reference numerals refer to like elements throughout. Sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from other components, and unless otherwise stated, the first component may be the second component, of course.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

Throughout the specification, when a part refers to a component as “including” or “having” a component, it does not exclude other components unless otherwise stated, but rather adds other components. means that it can contain

Throughout the specification, when “A and/or B” is used, it means A, B or A and B, unless specifically stated to the contrary, and when “C to D” is used, it means that there is no specific contrary description. Unless otherwise specified, it means that it is greater than or equal to C and less than or equal to D.

Reference to an element or layer “on” or “on” another element or layer includes not only directly on the other element or layer, but also with intervening other layers or elements. include all On the other hand, reference to an element "directly on" or "directly on" indicates that no intervening element or layer is interposed.

Spatially relative terms "below", "beneath", "lower", "above", "upper", etc. It can be used to easily describe a correlation between an element or components and other elements or components. The spatially relative terms should be understood as terms including different orientations of the device during use or operation in addition to the orientation shown in the drawings.

Hereinafter, with reference to the drawings, the invention will be described in more detail.

1 is a schematic exploded view of a display device 100 including a composite film COM. FIG. 2 is a schematic enlarged view of area A of FIG. 1 .

The display device 100 may be an organic light emitting diode display device 100 or a liquid crystal display device. The display device 100 includes a composite film COM and a light source BLU for emitting light to the composite film.

The composite film COM includes a color conversion filter film and a polarizing film.

The color conversion filter film includes a base film (AG), a color conversion layer (CC), and a color filter layer (CF).

The base film (AG) is a base element of a color conversion filter film in which a color filter layer (CF) and a color conversion layer (CC) are sequentially laminated, and is a light-transmitting element capable of transmitting visible light, and is a flexible element. The material may be appropriately selected according to the use or process. The base film AG may be, for example, a transparent plastic film, and may be appropriately selected according to the use of a flat panel display, a curved display, a flexible display, and the like.

Examples of the polymer constituting the transparent plastic film include polyimide (PI), polycarbonate (PC), polyacrylate (PA), polyethylene terepthalate (PET), polyethersulfone ( polyethersulphone (PES), polyarylate (PAR), polyetherimide (PEI), polyethylene napthalate (PEN), polyphenylene sulfide (PPS), polyallylate , polyimide, cellulose triacetate (CAT or TAC), and cellulose acetate propionate (CAP), but are not limited thereto.

The base film AG may be a low-reflection film. The low-reflection film has a low average reflectance to minimize glare due to external light reflection, for example, the average reflectance may be less than 3%, less than 2%, less than 1%, or less than 0.5%.

The base film AG is disposed farther from the light source BLU compared to the polarizing film.

The color filter layer CF may serve to transmit only light in a specific wavelength band among incident light and absorb light in the remaining wavelength band. The color filter layer CF is disposed between the base film AG and the color conversion layer CC.

For example, the color filter layer CF may include a first color filter unit CF1 , a second color filter unit CF2 , and a third color filter unit CF3 . The first color filter unit CF1 may emit a color different from that of the second color filter unit CF2 , and the third color filter unit CF3 may emit a color different from that of the first and second color filter units CF2 . can go out

For example, the first color filter unit CF1 may emit light in a longer wavelength band than that of the second color filter unit CF2 , and the second color filter unit CF2 is connected to the third color filter unit CF3 . Compared to that, it can emit light of a longer wavelength band. For example, the first color filter unit CF1 may be a red filter unit, the second color filter unit CF2 may be a green filter unit, and the third color filter unit CF3 may be a blue filter unit.

The red filter unit transmits only light in a red wavelength band, and absorbs, for example, light in a green wavelength band and a blue wavelength band. A red pigment is contained in a red filter part. The red pigment is not particularly limited, and for example, C.I. Pigment Red 177, C.I. Pigment Red 254, C.I. Pigment Red 7, C.I. Pigment Red 9, C.I. Pigment Red 14, C.I. Pigment Red 41, C.I. Pigment Red 81, C.I. Pigment Red 97, C.I. Pigment Red 122, C.I. Pigment Red 123, C.I. Pigment Red 146, C.I. Pigment Red 149, C.I. Pigment Red 155, C.I. Pigment Red 166, C.I. Pigment Red 168, C.I. Pigment Red 169, C.I. Pigment Red 176, C.I. Pigment Red 178, C.I. Pigment Red 180, C.I. Pigment Red 184, C.I. Pigment Red 185, C.I. Pigment Red 187, C.I. Pigment Red 192, C.I. Pigment Red 200, C.I. Pigment Red 220, C.I. Pigment Red 223, C.I. Pigment Red 224, C.I. Pigment Red 226, C.I. Pigment Red 227, C.I. Pigment Red 228, C.I. Pigment Red 240, C.I. Pigment Red 242, C.I. Pigment Red 246, C.I. Pigment Red 255, C.I. Pigment Red 264, C.I. Pigment Red 270, C.I. Pigment Red 272, C.I. Pigment Red 273, C.I. Pigment Red 276 or C.I. Pigment Red 277 or the like.

The green filter unit transmits only light of a green wavelength band, and absorbs light of, for example, a red wavelength band and a blue wavelength band. A green pigment is contained in a green filter part. The green pigment is not particularly limited, and for example, C.I. Pigment Green 7 or C.I. It may be a phthalocyanine-based compound such as Pigment Green PG36.

The blue filter unit transmits only light in a blue wavelength band, and absorbs, for example, light in a red wavelength band and a green wavelength band. A blue pigment is contained in a blue filter part. The blue pigment is not particularly limited, and for example, C.I. Pigment Blue 15, C.I. Pigment Blue 15:1, C.I. Pigment Blue 15:2, C.I. Pigment Blue 15:3, C.I. Pigment Blue 15:4, C.I. Pigment Blue 15:6, C.I. Pigment Blue 16, C.I. Pigment Blue 22, C.I. Pigment Blue 60, or C.I. Pigment Blue 64 or the like.

The color conversion layer CC may absorb light in a short wavelength band to emit light in a long wavelength band. By improving the color characteristics of light of a wavelength band of a predetermined color among incident light of the color conversion layer CC, it is possible to help the display apparatus 100 achieve high color reproduction. In addition, since the color conversion layer CC receives the incident light and emits light in all directions, the viewing angle characteristic of the display apparatus 100 may be improved.

The color conversion layer (CC) is disposed between the color filter layer (CF) and the polarizing film.

The color conversion layer CC includes the first color conversion unit CC1 disposed on the first color filter unit CF1 and the second color conversion unit CC2 disposed on the second color filter unit CF2. may include For example, when the color filter layer CF includes the first color filter unit CF1 , the second color filter unit CF2 , and the third color filter unit CF3 , the first color conversion unit CC1 is It is disposed on the first color filter unit CF1 , the second color conversion unit CC2 is disposed on the second color filter unit CF2 , and a predetermined color conversion unit is disposed on the third color filter unit CF3 . can be placed.

In addition, in some cases, the first color conversion unit CC1 disposed on the first color filter unit CF1 and the second color conversion unit CC2 disposed on the second color filter unit CF2 are included. can be This is, for example, when the color filter layer CF includes the first color filter unit CF1 , the second color filter unit CF2 , and the third color filter unit CF3 , the first color conversion unit CC1 ) is disposed on the first color filter unit CF1 , the second color conversion unit CC2 is disposed on the second color filter unit CF2 , and a predetermined color conversion unit is disposed on the third color filter unit CF3 . It means not placed on top.

For example, when the first color filter unit CF1 is a red filter unit, the first color conversion unit CC1 may be a red conversion unit that absorbs light in a green wavelength band and emits light in a red wavelength band. The red conversion part contains a red conversion material. The red conversion material may be a quantum dot, an inorganic red fluorescent dye, an organic red fluorescent dye, or a combination thereof. The red fluorescent dye is not particularly limited, and for example, (Ca, Sr, Ba)S, (Ca, Sr, Ba) ₂ Si ₅ N ₈ , Cazen (CaAlSiN ₃ ), CaMoO ₄ , Eu ₂ Si ₅ N It may be at least one of ₈ .

For example, when the second color filter unit CF2 is a green filter unit, the second color conversion unit CC2 may be a green conversion unit that absorbs light in a blue wavelength band and emits light in a green wavelength band. The red conversion material may be a quantum dot, an inorganic red fluorescent dye, an organic red fluorescent dye, or a combination thereof. The red fluorescent dye is not particularly limited, and for example, yttrium aluminum garnet (YAG), (Ca, Sr, Ba) ₂ SiO ₄ , SrGa ₂ S ₄ , barium magnesium aluminate (BAM), alpha sialon (α-SiAlON), beta sialon (β-SiAlON), Ca ₃ Sc ₂ Si ₃ O ₁₂ , Tb ₃ Al ₅ O ₁₂ , BaSiO ₄ , CaAlSiON, (Sr _{1 - x} Ba _x )Si ₂ O ₂ It may be at least one of N ₂ .

Quantum dots are capable of expressing various colors depending on the size of particles. When quantum dots are used as a color conversion material in the red conversion unit and/or the green conversion unit, the corresponding color may be expressed by adjusting the size of the particles. .

Quantum dots may be selected from, for example, but not limited to, Group II-VI compounds, Group III-V compounds, Group IV-VI compounds, Group IV elements, Group IV compounds, and combinations thereof. The group II-VI compound is a binary compound selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgZnTe, HgZnS, HgZnSe, HgZnTe, MgZnS, MgZnS and mixtures of three members selected from the group consisting of: bovine compounds; and HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof. The group III-V compound is a binary compound selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; a ternary compound selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. The group IV-VI compound is a binary compound selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; a ternary compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; and a quaternary compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. The group IV element may be selected from the group consisting of Si, Ge, and mixtures thereof. The group IV compound may be a di-element compound selected from the group consisting of SiC, SiGe, and mixtures thereof.

The polarizing film transmits only light that vibrates in the same direction as the polarization axis, and absorbs or reflects other light to create polarized light in a specific direction. The polarizing film is laminated or bonded on the color conversion filter film. For example, the polarizing film may be laminated or bonded on the color conversion layer (CC). The polarizing film is disposed closer to the light source BLU than the base film AG.

The polarizing film may be a light absorbing polarizing film (POL-1) and/or a light reflective polarizing film (Re-POL). In FIG. 1 , the polarizing film is illustrated as including both a light absorbing polarizing film (POL-1) and a light reflective polarizing film (Re-POL), but the polarizing film is not limited thereto, and the polarizing film is , may be composed of only a light absorbing polarizing film (POL-1), may be composed of only a light reflective polarizing film (Re-POL), and a light absorbing polarizing film (POL-1) and a light reflective polarizing film (POL-1) It may be configured to include all of the film (Re-POL). The polarizing film may be, for example, a form in which a light absorbing polarizing film (POL-1) and a light reflective polarizing film (Re-POL) are laminated or bonded.

A light reflective polarizing film (Re-POL) transmits only light that vibrates in the same direction as the polarization axis and reflects other light to create polarization in a specific direction. The light reflective polarizing film (Re-POL) is not particularly limited as long as it transmits only light that vibrates in the same direction as the polarization axis and reflects other light to create polarized light in a specific direction. For example, double luminance It may be an enhancement film (DBEF: Dual Brightness Enhancement Film).

The light-absorbing polarizing film (POL-1) transmits only light that vibrates in the same direction as the polarization axis and absorbs other light to create polarized light in a specific direction. The light-absorbing polarizing film (POL-1) is not particularly limited as long as it transmits only light that vibrates in the same direction as the polarization axis and absorbs other light, for example, PVA dyed with iodine or a dichroic dye. It may be a type polarizing film or the like.

On the other hand, when configured to include both the light absorbing polarizing film (POL-1) and the light reflective polarizing film (Re-POL), the light reflective polarizing film (Re-POL) is a color conversion layer (CC) and light It is disposed between the absorption-type polarizing films (POL-1). At this time, the color filter layer CF is disposed between the base film AG and the color conversion layer CC.

Only a portion of the light emitted from the color conversion layer (CC) in all directions is transmitted to the color filter layer (CF). Accordingly, the light efficiency of the display apparatus 100 may be improved.

As described above, the base film AG may be a low reflection film. When the polarizing film includes a light reflective polarizing film (Re-POL), the average reflectance of the base film (AG) is lower than that of the light reflective polarizing film (Re-POL). The low-reflection film has a low average reflectance to minimize glare due to external light reflection, for example, the average reflectance may be less than 3%, less than 2%, less than 1%, or less than 0.5%.

Meanwhile, the light source BLU is not particularly limited as long as it emits light to the composite film COM. When the display device 100 is the organic light emitting diode display device 100 , the light source BLU may be a light emitting layer, and when the display device 100 is a liquid crystal display device, the light source BLU may be a backlight unit. In addition, the backlight unit may be a direct light type backlight unit, a side type backlight unit, or the like.

In FIG. 1 , a case in which the display device 100 is a liquid crystal display device is exemplified, but the display device 100 is not limited to the liquid crystal display device shown in FIG. 1 , and the light source BLU is shown in FIG. 1 . It is not limited only to the illustrated side-type backlight unit. The side backlight unit includes a light guide plate LGD and a light emitting diode chip disposed on side surfaces of the light guide plate LGD. The light emitted from the light emitting diode chip is incident on the light guide plate LGD, and the light path is changed to the composite film COM side.

Taking the liquid crystal display shown in FIG. 1 as an example, the display apparatus 100 may include a liquid crystal layer (N-LC).

The liquid crystal layer N-LC includes liquid crystal molecules LC. The liquid crystal molecules LC may be liquid crystal molecules LC having negative dielectric anisotropy and/or liquid crystal molecules LC having positive dielectric anisotropy. The liquid crystal layer N-LC is disposed between the composite film COM and the light source BLU. In this case, the polarizing film may be disposed between the color conversion filter film and the liquid crystal layer (N-LC). In this case, when the polarizing film is configured to include both a light absorbing polarizing film (POL-1) and a light reflective polarizing film (Re-POL), the light reflective polarizing film (Re-POL) is a color conversion layer ( CC) and the light absorbing polarizing film (POL-1), the light absorbing polarizing film (POL-1) is a light reflective polarizing film (Re-POL) and a liquid crystal layer (N-LC) placed between

The liquid crystal layer N-LC may include, for example, a liquid crystal capsule in which liquid crystal molecules LC are filled in a polymer capsule C having a diameter of several to several hundreds of nanometers. The liquid crystal layer N-LC may further include a buffer layer. Liquid crystal capsules are dispersed in the buffer layer. The diameter of the liquid crystal capsule may be 1 nm to 320 nm. When an electric field is not applied, the liquid crystal capsule has photosynthetic isotropy, and when an electric field is applied, the liquid crystal capsule may be oriented in a predetermined direction according to the direction of the electric field generated between the electric field generating electrodes.

Meanwhile, the light source BLU may emit blue light to the composite film COM via the liquid crystal layer N-LC. In this case, the color filter film may include a red filter unit, a green filter unit, and a blue filter unit, and the color conversion film is disposed to overlap the red filter unit and the red filter unit and the green filter unit. It may be composed of a green conversion unit.

When the display device 100 is designed to include a liquid crystal layer (N-LC) including a liquid crystal capsule and a light source (BLU) emitting blue light, each sub-pixel is independently driven to realize red, green, and blue colors Since this is not required, the driving voltage of the display apparatus 100 may be improved.

The display apparatus 100 includes a switching element array substrate on which a switching element array TFT is formed by disposing a gate line (not shown), a data line (not shown), a storage line (not shown), etc. on a light-transmitting substrate SUB. (TFT-ARRAY) may be further included. A pixel (not shown) may be defined by cross-arranging the gate line (not shown) and the data line (not shown), and the pixel may be divided into sub-pixels (not shown). For example, the red filter unit may be disposed to overlap the first sub-pixel (not shown), the green filter unit may be disposed to overlap the second sub-pixel (not shown), and the blue filter unit may be disposed to overlap the third sub-pixel (not shown). (not shown) may be overlapped. The switching element array substrate TFT-ARRAY may be disposed between the liquid crystal layer N-LC and the light source BLU. The switching element may be, for example, a thin film transistor.

The light-transmitting substrate SUB is not particularly limited as long as it can transmit visible light, and the material may be appropriately selected according to the use or process. The light-transmitting substrate may be a glass substrate, a transparent plastic film, or the like. The base film AG may have a lower average reflectance compared to the light-transmitting substrate.

When the liquid crystal layer N-LC includes a liquid crystal capsule, electric field generating electrodes (not shown) may be disposed on the switching element array substrate TFT-ARRAY. In this case, the electric field generating electrodes (not shown) time), on the basis of the liquid crystal layer (N-LC), the liquid crystal layer (N-LC) including the liquid crystal capsule (N-LC) is not required to be separately disposed on the so-called TFT substrate and the so-called color filter substrate, which are respectively arranged on the upper and lower portions. ) and/or when the composite film COM is applied, there is an advantage in that the thickness of the display apparatus 100 is reduced, and there is an advantage suitable for the flexible display apparatus 100 compared to the conventional one.

On the other hand, when the liquid crystal layer (N-LC) includes a liquid crystal capsule, since the initial alignment of the liquid crystal molecules (LC), pre-tilt alignment, etc. are not required, the alignment layer for this can be omitted, thereby simplifying the process of the liquid crystal display device. and structural simplification.

The display apparatus 100 may further include a polarizing film POL-2 between the light source BLU and the switching element array substrate TFT-ARRAY, and the polarizing film may include a light absorption type polarizing film POL. -1) or a combination of this and a light reflective polarizing film (Re-POL).

In general, in a liquid crystal display device, light emitted from a light source may decrease in light efficiency as it passes through a switching element array substrate, a liquid crystal layer, and a color filter layer. When the display device 100 is a liquid crystal display device and the polarizing film includes a light reflective polarizing film (Re-POL), the color conversion layer (CC) receives the light emitted from the light source (BLU), and a predetermined color emits light in all directions, and the light reflective polarizing film (Re-POL) transmits some of the light emitted from the color conversion layer (CC) to the color filter layer (CF), so the liquid crystal layer (N-LC) Since the light that does not pass through is emitted to the outside and the influence of the liquid crystal layer is less than that of a general liquid crystal display device, the light efficiency of the display device 100 can be improved.

3 and 4 schematically show a manufacturing process of the composite film COM used in the display device 100 of FIG. 1 .

3 and 4 , the color conversion filter film S1 forms a color conversion layer CC on the glass substrate G, and subsequently, a color filter layer CF on the color conversion layer CC. ) is formed, the base film AG is disposed on the color filter layer CF, and the glass substrate G is separated by the color conversion layer CC. In other words, by transferring the laminate structure of the color conversion layer (CC) and the color filter layer (CF) formed on the glass substrate (G) to the base film (AG), the color conversion filter film (S1) can be produced have. Since the method of forming the color filter layer (CF) and the color conversion layer (CC) is known, detailed descriptions other than the following 1) to 5) will be omitted below.

1) A coating process of forming a coating film by applying a coating solution containing a predetermined dye or color conversion material (eg, fluorescent dye, red pigment, green pigment, blue pigment, etc.) on a substrate;

2) an exposure process of selectively exposing a part of the coating film by using a mask such as FMM;

3) A pre-baking process of baking the coating film at a predetermined temperature after the exposure process

4) a developing process of forming a predetermined pattern by removing the unexposed area of the coating film that is not exposed to light using a developer;

5) A post-baking process in which a predetermined pattern is again baked at a predetermined temperature

When the polarizing film S2 includes both the light absorbing polarizing film (POL-1) and the light reflective polarizing film (Re-POL), the light reflective polarizing film on the light absorbing polarizing film (POL-1) By disposing the film (Re-POL) and laminating or bonding them, the polarizing film S2 may be manufactured.

Thereafter, a composite film may be obtained by laminating or bonding the color conversion filter film S1 and the polarizing film S2. In Figure 4, the color conversion filter film (S1) and the polarizing film (S2) by a roll-to-roll (roll-to-roll), the process of laminating or bonding to each other is schematically shown.

Referring to FIG. 4 , a color conversion filter film S1 is wound on a first roll ROL-1, and a polarizing film S2 is wound on a second roll ROL-2. When the color conversion filter film (S1) and the polarizing film (S2) respectively wound on the first roll (ROL-1) and the second roll (ROL-2) are released, the upper roll (CR1) of the paper roll (RTR) and While the laminate of the color conversion filter film S1 and the polarizing film S2 passes between the lower rolls CR2, the composite film COM may be obtained by a roll-to-roll method.

FIG. 5 schematically illustrates a process of manufacturing the display device 100 of FIG. 1 by using the composite film COM of FIG. 3 .

Referring to FIG. 5 , after the composite film COM is disposed on the upper part of the display panel, the composite film COM and the display panel are bonded to each other, and subsequently, the light source BLU is mounted on the lower part of the display panel. Thus, the display device 100 can be obtained.

In FIG. 5 , when the display device 100 is a liquid crystal display device, the display panel forms a liquid crystal layer N-LC on a switching element array substrate TFT-ARRAY, and a switching element array substrate TFT-ARRAY. ) After forming the polarizing film (POL-2) on the lower side, the composite film (COM) may be bonded or bonded on the upper portion of the liquid crystal layer (N-LC). In this case, the light source BLU may be disposed and mounted under the polarizing film POL-2.

Although the embodiments have been described above with reference to the accompanying drawings, the invention is not limited to the above embodiments, but may be manufactured in various different forms by combining the contents disclosed in each embodiment, and is commonly known in the art to which the invention pertains. Those skilled in the art will be able to understand that the invention may be implemented in other specific forms without changing the technical spirit or essential features of the invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: display device
COM: Composite Film
CF: color filter layer
CC: color conversion layer
BLU: light source
N-LC: liquid crystal layer
LC: liquid crystal molecules
Re-POL: Light reflective polarizing film
POL-1, POL-2: light absorption type polarizing film

Claims (9)

color conversion filter film; and
a polarizing film bonded to the color conversion filter film to create polarized light in a specific direction; including,
The color conversion filter film,
A base film, a color conversion layer that absorbs light in a short wavelength band and emits light in a long wavelength band, and a color filter layer disposed between the base film and the color conversion layer and selectively transmitting light in a specific wavelength band,
The color conversion layer is disposed between the color filter layer and the polarizing film,
The polarizing film includes a light absorbing polarizing film and a light reflective polarizing film,
The light reflective polarizing film is disposed between the color conversion layer and the light absorbing polarizing film,
composite film. delete The method of claim 1,
The base film has a low average reflectance compared to the light reflective polarizing film,
composite film. The method of claim 1,
The color filter layer includes a first color filter unit, a second color filter unit, and a third color filter unit emitting different colors,
The color conversion layer includes a first color conversion unit disposed on the first color filter unit and a second color conversion unit disposed on the second color filter unit,
composite film. The composite film according to claim 1 ; and
Including; a light source emitting light to the composite film;
In the composite film,
The base film, compared to the polarizing film, is disposed far from the light source,
display device. 6. The method of claim 5,
a liquid crystal layer disposed between the composite film and the light source, the liquid crystal layer including a liquid crystal capsule filled with liquid crystal molecules inside the capsule; includes,
Between the color conversion filter film and the liquid crystal layer, the polarizing film is disposed,
display device. delete 6. The method of claim 5,
The base film has a low average reflectance compared to the light reflective polarizing film,
display device. 7. The method of claim 6,
The light source emits blue light to the composite film via the liquid crystal layer,
The color filter layer includes a red filter unit, a green filter unit, and a blue filter unit,
The color conversion layer includes a red conversion unit disposed to overlap the red filter unit and a green conversion unit disposed to overlap the green filter unit,
display device.

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