KR102368665B1 - Color conversion filter substrate and display device including the same - Google Patents

Abstract

Disclosed are a color conversion filter substrate and a display device including the same.
The color conversion filter substrate includes a color filter layer and a color conversion layer.
The color filter layer includes a first color filter unit and a second color filter unit emitting a color different from that of the first color filter unit. The color conversion layer includes a first color conversion unit and a second color conversion unit.
The first color conversion unit is disposed on the first color filter unit, and the second color conversion unit is disposed on the second color filter unit.
The first color conversion unit includes a pattern formed of barrier ribs spaced apart from each other to expose the first color filter unit between the barrier ribs.

Description

COLOR CONVERSION FILTER SUBSTRATE AND DISPLAY DEVICE INCLUDING THE SAME

The present invention relates to a color conversion filter substrate 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.

An object of the present invention is to provide a color conversion filter substrate capable of realizing both high color reproduction characteristics and high luminance characteristics.

An object of the present invention is to provide a display device capable of realizing both high color reproduction characteristics and high luminance characteristics.

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.

A color conversion filter substrate according to an embodiment includes a color filter layer and a color conversion layer. The color filter layer includes a first color filter unit and a second color filter unit emitting a color different from that of the first color filter unit.

The color conversion layer includes a first color conversion unit and a second color conversion unit. The first color conversion unit is disposed on the first color filter unit, and the second color conversion unit is disposed on the second color filter unit.

The first color conversion unit of the first color conversion unit and the second color conversion unit includes a pattern formed of barrier ribs spaced apart from each other and exposing the first color filter unit between the barrier ribs.

In the color conversion substrate, when a total area of a surface opposite to the first color filter unit facing the first color conversion unit is defined as a unit area, the total volume of the first color conversion unit per unit area is equal to per unit area It may be smaller than the total volume of the second color conversion unit.

A display apparatus according to an embodiment includes a color conversion filter substrate and a light source.

The color conversion filter substrate includes a color filter layer and a color conversion layer.

The color filter layer includes a first color filter unit and a second color filter unit emitting a color different from that of the first color filter unit.

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.

The light source emits light to the color conversion filter substrate.

In the display device, a total volume of the first color conversion unit per pixel is smaller than a total volume of the second color conversion unit per pixel.

Each of the color conversion filter substrate and the display device may satisfy any one of the following formulas (1) to (3):

식 (1)

Equation (1)

식 (2)

Equation (2)

식 (3)

Equation (3)

In the above formulas (1) to (3), each

A1 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the first color conversion unit, and A2 is the light emission intensity in the wavelength band of 615 nm to 670 nm in the second color conversion unit.

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

The present invention can provide a color conversion filter substrate capable of realizing both high color reproduction characteristics and high luminance characteristics.

The present invention can provide a display device capable of realizing both high color reproduction characteristics and high luminance characteristics.

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

1 is a schematic cross-sectional view of a display device including a color conversion filter substrate.
FIG. 2 illustrates a color gamut measurement result of the display device of FIG. 1 .
FIG. 3 shows an embodiment of the display device of FIG. 1 .
FIG. 4 shows another embodiment of the display device of FIG. 1 .
FIG. 5 shows another embodiment of the display device of FIG. 1 .

Advantages and features of the invention, and a method for achieving them will become apparent with reference to the embodiments and experimental examples described below in detail 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 is provided 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 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, it goes without saying that the first component may be the second component.

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

Throughout the specification, when a part refers to "including" or "having" a certain element, it does not exclude other elements, but adds other elements unless otherwise stated. means that it can include

Throughout the specification, when “A and/or B” is used, it means A, B or A and B, unless otherwise stated, and when “C to D” is used, it means that there is no specific opposite 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 other layers or other elements intervening. 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 the 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 cross-sectional view of a display device 100 including a color conversion filter substrate 10 .

Referring to FIG. 1 , the display apparatus 100 includes a color conversion filter substrate 10 and a light source LS emitting light to the color conversion filter substrate 10 . The light source LS may be disposed under the color conversion filter substrate 10 .

The color conversion filter substrate 10 includes a substrate SUB, a color filter layer CF, and a color conversion layer CC. In a direction away from the light source LS, the color conversion layer CC, the color filter layer CF, and the substrate SUB may be sequentially disposed.

The light source LS may be an organic light emitting diode, and light emitted from the light source LS is not particularly limited, but in one example, may be white light W. Since the structure of the organic light emitting diode, the components of each layer, etc. are known, the detailed description will be omitted below, and the known technology for the organic light emitting diode, even if not specifically described in the present specification, is of the invention. merged within the scope.

Light emitted from the light source LS passes through the color conversion layer CC, the color filter layer CF, and the substrate SUB in order, and is emitted to the outside, and the color conversion layer CC and the color filter layer CF While passing through, it is emitted as light in a wavelength band of a predetermined color.

The color conversion layer CC may be disposed between the light source LS and the color filter layer CF. The color conversion layer CC may serve to absorb light of a short wavelength region among incident light, convert it into light of a long wavelength region, and output the light to the color filter layer CF. The color conversion layer CC includes a color conversion material (CCM) that absorbs light in a short wavelength region, converts it into light in a long wavelength region, and emits light.

The color conversion material may be, for example, a quantum dot, a fluorescent dye, or a combination thereof. Fluorescent dyes include, for example, organic fluorescent substances, inorganic fluorescent substances, and combinations thereof.

The quantum dot may be selected from, but not limited to, a group II-VI compound, a group III-V compound, a group IV-VI compound, a group IV element, a group IV compound, 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 thereof 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 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 binary compound selected from the group consisting of SiC, SiGe, and mixtures thereof.

In this case, the binary compound, the ternary compound, or the quaternary compound may be present in the particle at a uniform concentration, or may be present in the same particle as the concentration distribution is partially divided into different states. Also, one quantum dot may have a core/shell structure surrounding another quantum dot. The interface between the core and the shell may have a concentration gradient in which the concentration of the element present in the shell decreases toward the center.

The quantum dots may have a full width of half maximum (FWHM) of the emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, more preferably about 30 nm or less, and in this range, color purity or color reproducibility can be improved. can In addition, light emitted through the quantum dots is emitted in all directions, so that a wide viewing angle may be improved.

In addition, the shape of the quantum dot is not particularly limited to that of a generally used type, but more specifically, spherical, pyramidal, multi-arm, or cubic nanoparticles, nanotubes, nanowires, A thing in the form of nanofibers, nanoplate-shaped particles, etc. can be used.

The fluorescent dye may be, for example, a red fluorescent dye, a green fluorescent dye, a dye emitting light of a third color other than that, or a combination thereof.

The red fluorescent dye is a material that absorbs light in the green wavelength band and emits light in the red wavelength band, for example, (Ca, Sr, Ba)S, (Ca, Sr, Ba) ₂ Si ₅ N ₈ , Kazen ( CaAlSiN ₃ ), CaMoO ₄ , and may be at least one of Eu ₂ Si ₅ N ₈ . In addition, the red fluorescent dye may be, for example, a material having a maximum emission peak at 617 nm to 637 nm and a full width at half maximum (FWHM) of 40 nm to 50 nm. In an embodiment, as the red fluorescent dye, a material having a maximum emission peak at 627 nm and a full width at half maximum (FWHM) of 44 nm may be used. However, the red fluorescent dye is not limited to the above-described examples.

Green fluorescent dye is a material that absorbs light in the blue wavelength band and emits light in the green wavelength band, 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, ( It may be at least one of Sr _1-x Ba _x )Si ₂ O ₂ N ₂ . In addition, the green fluorescent dye may be, for example, a material having a maximum emission peak at 510 nm to 525 nm and having a full width at half maximum (FWHM) of 60 nm to 70 nm. In an embodiment, the green fluorescent dye includes a first green fluorescent dye having a maximum emission peak at 520 nm and a full width at half maximum (FWHM) of 62 nm, and a maximum emission peak at 511 nm and a maximum width at half maximum (FWHM) of 64 nm. A phosphorus second green fluorescent dye may be used. However, the green fluorescent dye is not limited to the above-described examples.

The color conversion layer CC includes a first color conversion unit CC1 and a second color conversion unit CC2. The first color conversion unit CC1 includes a pattern in which the first color filter unit CF1 is exposed between the barrier ribs CW2 that are disposed to be spaced apart from each other.

In the partition walls CW2, a color conversion material that absorbs light of a shorter wavelength than the light of a wavelength range emitted from the second color conversion unit CC2 and excites light of a wavelength range emitted from the second color conversion unit CC2 is provided. may contain.

Compared to the light emitted through the first color conversion unit CC1 and the first color filter unit CF1, the light emitted through the second color conversion unit CC2 and the second color filter unit CF2 It may be light of a short wavelength band. For example, the color conversion filter substrate 10 may emit light passing through the first color conversion unit CC1 and the first color filter unit CF1 as green light G, and the second color conversion unit Light emitted through CC2 and the second color filter unit CF2 may be emitted as red light R.

The barrier ribs CW2 may be manufactured using one type of red converting material, may be manufactured using two types of red converting materials having different emission wavelengths in the red wavelength band, and may be manufactured using one type of red converting material that emits light in the green wavelength band. It may be manufactured by using a combination of a color conversion material of one type and a color conversion material of one type that emits light in a red wavelength band.

The barrier ribs CW2 may contain, for example, a color conversion material that absorbs light of a green wavelength band and excites light of a long wavelength band (eg, light of a red wavelength band) compared to light of a green wavelength band. .

Also, in some cases, the barrier ribs CW2 absorb light of a shorter wavelength than the light of a wavelength band emitted from the first color filter unit CF1 to excite light of a wavelength band emitted from the first color filter unit CF1. A color conversion material may be further contained.

The barrier ribs CW2 may further contain, for example, a color conversion material that absorbs light of a blue wavelength band and excites light of a long wavelength band (eg, light of a green wavelength band) compared to light of a blue wavelength band. there is.

The second color conversion unit CC2 may be formed of a single non-patterned barrier rib that does not expose a portion of the second color conversion filter unit CF2 . The second color conversion unit CC2 absorbs light in a shorter wavelength band than the light in the wavelength band emitted from the second color conversion unit CC2 and excites the light in the wavelength band emitted from the second color conversion unit CC2. Conversion substances may be contained.

Compared to the light emitted through the second color conversion unit CC2 and the second color filter unit CF2, the light emitted through the first color conversion unit CC1 and the first color filter unit CF1 It may be light of a long wavelength band. For example, the color conversion filter substrate 10 may emit light passing through the first color conversion unit CC1 and the first color filter unit CF1 as green light G, and the second color conversion unit Light emitted through CC2 and the second color filter unit CF2 may be emitted as red light R.

The second color conversion unit CC2 may be manufactured using one type of red conversion material, may be manufactured using two types of red conversion materials having different emission wavelengths in the red wavelength band, and emit light in the green wavelength band. It may be manufactured using a combination of one type of color conversion material that emits light and one type of color conversion material that emits light in a red wavelength band.

The second color conversion unit CC2 contains, for example, a color conversion material that absorbs light in a green wavelength band and excites light of a longer wavelength band (for example, light in a red wavelength band) compared to light in the green wavelength band. can be

In addition, in some cases, the second color conversion unit CC2 absorbs light of a shorter wavelength than the light of a wavelength band emitted from the first color filter unit CF1 and has a wavelength band emitted from the first color filter unit CF1. A color conversion material that excites light may be further contained.

The second color conversion units CC2 include, for example, a color conversion material that absorbs light in a blue wavelength band and excites light of a longer wavelength band (eg, light in a green wavelength band) compared to light in the blue wavelength band. may contain more.

In the color conversion filter substrate 10 , the barrier ribs CW2 absorb light of a shorter wavelength than the light of the wavelength band emitted from the second color conversion unit CC2 , and the light of the wavelength range emitted from the second color conversion unit CC2 . By excitation of , the luminance of the light in the wavelength band emitted through the second color conversion unit CC2 and the second filter unit CF2 may be increased.

In relation to this, when the first color filter unit CF1 is a green filter unit emitting green light G and the second color filter unit CF2 is a red filter unit emitting red light, the color conversion filter substrate 10 is , the barrier ribs CW2 absorb the green light G and excite the red light R, thereby absorbing the light in the region between the green light G and the red light R, and the green light G and the red light R ) can increase the color purity and the luminance of the red light (R) can be increased.

Meanwhile, the color conversion filter substrate 10 has a predetermined pattern in which partition walls CW2 are selectively provided only in the first color conversion unit CC1 among the first color conversion unit CC1 and the second color conversion unit CC2 . By adjusting the color thickness by providing , the color standard can be satisfied.

In addition, the color conversion filter substrate 10 may adjust absorption and excitation characteristics of incident light by providing a predetermined pattern in which the barrier ribs CW2 are provided.

FIG. 2 shows a color gamut measurement result of the display device 100 of FIG. 1 .

In FIG. 2 , definitions of terms used are as follows.

- CCM 100%: Red emission intensity is 100%.

- CCM 90%: Red emission intensity of 90% compared to CCM 100%.

- CCM 80%: 80% of red emission intensity compared to 100% CCM.

- CCM 70%: 70% of red emission intensity compared to 100% CCM.

- CCM 60%: 60% of red emission intensity compared to 100% CCM.

- CCM 50%: 50% of red emission intensity compared to 100% CCM.

- Ref. (CW14): No color conversion layer.

In FIG. 2 , the display device 100 used to measure the color gamut is configured as follows.

1) First color conversion unit (CC1, Green pixel CCM): a pattern composed of mutually spaced barrier ribs CW2

- Containing a red conversion material that absorbs light in a green wavelength band and excites light in a red wavelength band, and has a red emission intensity of 50% to 90% compared to 100% of the second color conversion unit (CC2)

2) Second color conversion unit (CC2, Red pixel CCM 100%): non-patterned single barrier rib

- Contains red conversion material and has 100% red emission intensity

3) Light source (LS): organic light emitting diode emitting white light (W)

Referring to FIG. 2 , by having the first color conversion unit CC1 and the second color conversion unit CC2 provided with a pattern composed of the partition walls CW2 spaced apart from each other, the display apparatus 100 has red luminance. 100%, green luminance 69% to 90%, Adobe overlap ratio 97% to 99%, DCI overlap ratio 99%, BT2020 overlap ratio 84% to 85% could be satisfied.

Meanwhile, in FIG. 2 , the control display device used to measure the color gamut is configured as follows.

1) First color conversion unit (CC1, Green pixel): a pattern composed of barrier ribs spaced apart from each other

2) Second color conversion unit (CC2, Red pixel): non-patterned single barrier rib

NO second color conversion unit
(Red pixel) first color conversion unit
(Green pixel) Adobe Overlay Ratio DCI overlap ratio BT2020 overlap ratio One Ref. (CW14) Ref. (CW14) 96% 98% 77% 2 Ref. (CW14) CCM 100% 99% 98% 79% 3 Ref. (CW14) CCM 90% 99% 98% 79% 4 Ref. (CW14) CCM 80% 99% 98% 78% 5 Ref. (CW14) CCM 70% 98% 98% 78% 6 Ref. (CW14) CCM 60% 98% 98% 78% 7 Ref. (CW14) CCM 50% 97% 98% 78% 8 CCM 100% Ref. (CW14) 96% 99% 83%

Referring to Table 1, the control display device satisfies the Adobe overlap ratio 96% to 99%, DCI overlap ratio 98% to 99%, and BT2020 overlap ratio 77% to 83%, and the color gamut compared to the display device 100 , in particular, it can be seen that the BT2020 overlap ratio is low.

Meanwhile, referring to FIG. 2 , it can be seen that the display device 100 has higher green luminance compared to a case in which a red conversion layer having a red emission intensity of 100% is disposed in both the red pixel and the green pixel. Table 2 summarizes the comparison results.

second color conversion unit
(Red pixel) first color conversion unit
(Green pixel) red luminance green luminance note CCM 100% CCM 100% 100% 69% comparative example CCM 100% CCM 90% 100% 73% Example CCM 100% CCM 80% 100% 77% CCM 100% CCM 70% 100% 81% CCM 100% CCM 60% 100% 85% CCM 100% CCM 50% 100% 90%

Meanwhile, in the display apparatus 100 , the color conversion layer CC is disposed to overlap the pixel PX, and in this case, the first color conversion unit CC1 and the second color conversion unit CC2 are each The first sub-pixel S-PX1 and the second sub-pixel S-PX2 may be overlapped. In this regard, in the display apparatus 100 , the first color conversion unit CC1 may have an area corresponding to the first sub-pixel S-PX1 , and the second color conversion unit CC2 may have a second It may have an area corresponding to the sub-pixel S-PX2.

In this case, the total volume of the partition walls CW2 per pixel PX is smaller than the total volume of the second color conversion unit CC2 per pixel PX. Also, the total volume of the partition walls CW2 per unit area is smaller than the total volume of the second color conversion unit CC2 per unit area.

On the other hand, when the area of each of the sub-pixels S-PX1, S-PX1, and S-PX3 is substantially the same and the heights of the color conversion layers CC1 and CC2 are substantially the same, the volume ratio may be equal to the area ratio. there is.

The color conversion filter substrate 10 and/or the display device 100 may satisfy any one of the following Equations (1) to (3), respectively:

식 (1)

Equation (1)

식 (2)

Equation (2)

식 (3)

Equation (3)

In the above formulas (1) to (3), each

A1 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the first color conversion unit, and A2 is the light emission intensity in the wavelength band of 615 nm to 670 nm in the second color conversion unit.

For example, the color conversion layer CC may include only the first color conversion unit CC1 and the second color conversion unit CC2 . For example, when the color filter layer CF includes the third color filter unit CF3 that emits light of a shorter wavelength than the first color filter unit CF1 and the second color filter unit CF2, color conversion The layer CC may include only the first color conversion unit CC1 corresponding to the first color filter unit CF1 and the second color conversion unit CC2 corresponding to the second color filter unit CF2. . In this case, no arbitrary color conversion unit may be disposed on the third color filter unit CF3 .

The color conversion layer CC may be formed through a photolithography process using a precursor material including a color conversion material and a photosensitive resin, etc. The two color conversion units CC2 may be patterned to be spaced apart from each other on the color filter layer CF.

For example, the second partition walls CW2 and the second color conversion unit CC2 are simultaneously patterned using a single mask, and then the first partition walls CW1 are patterned between the second partition walls CW2. In this way, the pattern provided in the first color conversion unit CC1 may be manufactured.

The color filter layer CF is a device interposed between the substrate SUB and the color conversion layer CC, and may include a first color filter unit CF1 and a second color filter unit CF2 .

The first color filter unit CF1 is disposed to overlap the first color conversion unit CC1 , and the second color filter unit CF2 is disposed to overlap the second color conversion unit CC2 . In addition, the color filter layer CF is disposed to overlap the pixel PX of the display apparatus 100 , and in this case, the first color filter unit CF1 and the second color filter unit CF2 are each of the first part The pixel S-PX1 and the second sub-pixel S-PX2 may be overlapped.

The first color filter unit CF1 is disposed in an area overlapping the first color conversion unit CC1 and selectively transmits only light in a wavelength band of a predetermined color from among the light passing through the first color conversion unit CC1 . and can absorb all light of different color wavelength bands. Preferably, the first color filter unit CF1 selectively transmits light in a wavelength band emitted from the first color conversion unit CC1 disposed to overlap the first color filter unit CF1.

The second color filter unit CF2 is disposed in an area overlapping the second color conversion unit CC2 and selectively transmits only light in a wavelength band of a predetermined color among the light passing through the second color conversion unit CC2 . and can absorb all light of different color wavelength bands. The second color filter unit CF2 may selectively transmit light in a wavelength band different from that of the first color filter unit CF1 . It is preferable that the second color filter unit CF2 selectively transmits light in a wavelength band emitted from the second color conversion unit CC2 disposed to overlap the second color filter unit CF2.

For example, the first color filter unit CF1 may be a green filter unit that selectively transmits only light in a green wavelength band and absorbs both light in a blue wavelength band and/or light in a red wavelength band, and in this case, the second color The filter unit CF2 may be a red filter unit that selectively transmits only light in a red wavelength band and absorbs both light in a blue wavelength band and/or light in a green wavelength band.

The first color filter unit CF1 and the second color filter unit CF2 are not limited to the red filter unit and the green filter unit, respectively, as in the above-described example, and vice versa. In other words, when the first color conversion unit CC1 is a red conversion unit, the first color filter unit CF1 may be a red filter unit, and when the second color conversion unit CC2 is a green conversion unit, the second color filter The unit CF2 may be a green filter unit.

The color filter layer CF has a predetermined pattern. For example, the first color filter unit CF1 and the second color filter unit CF2 form a predetermined pattern such as a stripe type, a mosaic type, and a delta type. It may be arranged to be spaced apart from each other to have.

The color filter layer CF may further include a third color filter unit CF3 emitting a different color from each of the first color filter unit CF1 and the second color filter unit CF2 . The third color filter unit CF3 may be disposed in an area overlapping with any color conversion unit emitting light having a shorter wavelength than that of the first color conversion unit CC1 and the second color conversion unit CC2 . In this case, it is preferable that the third color filter unit CF3 selectively transmits light in a wavelength band emitted from an arbitrary color conversion unit arranged to be overlapped. In some cases, any color conversion unit may not be disposed under the third color filter unit CF3 .

The color filter layer CF is disposed to overlap the pixel PX of the display apparatus 100 , and in this case, the first color filter unit CF1 , the second color filter unit CF2 , and the third color filter unit CF CF3 may be disposed to overlap the first sub-pixel S-PX1 , the second sub-pixel S-PX2 , and the third sub-pixel S-PX3 , respectively.

For example, the first color filter unit CF1 may be a green filter unit that selectively transmits only light in a green wavelength band and absorbs both light in a blue wavelength band and/or light in a red wavelength band, and in this case, the second color The filter unit CF2 may be a red filter unit that selectively transmits only light in a red wavelength band and absorbs both light in a blue wavelength band and/or light in a green wavelength band. In this case, the third color filter unit CF3 is blue It may be a blue filter unit that selectively transmits only light in a wavelength band and absorbs both light in a green wavelength band and/or light in a red wavelength band. In the above-described example, when the third color filter unit CF3 is the blue filter unit, the white light W emitted from the light source LS does not pass through any arbitrary color conversion unit, and the third color filter unit CF3 may be employed as

A method of manufacturing the color filter layer CF is not particularly limited. The color filter layer CF may be manufactured, for example, through the following processes 1) to 5).

1) A coating solution containing a predetermined dye (for example, a red pigment when forming a red filter, a green pigment when forming a green filter, a blue pigment when forming a blue filter, etc.), a photosensitive resin, and a short wavelength absorption photoinitiator on a substrate Coating process to form a coating film by applying,

2) an exposure process of selectively exposing a portion of the coating film using a mask provided with a light transmitting part;

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

4) a developing process of forming a predetermined color filter 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 color filter pattern is again baked at a predetermined temperature

Examples of red pigments include 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, etc. are mentioned.

Examples of green pigments include C.I. Pigment Green 7 or C.I. Phthalocyanine-type compounds, such as Pigment Green PG36, are mentioned.

Examples of blue pigments include 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 etc. are mentioned.

Examples of the photosensitive resin include a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, and an amino group with a (meth)acrylic compound having a reactive substituent such as an isocyanate group, an aldehyde group, an epoxy group, and cinnamic acid to react, (meth)acrylo A resin in which a photocrosslinkable group such as a diyl group or a styryl group is introduced into a linear polymer or a linear polymer containing an acid anhydride such as a styrene-maleic anhydride copolymer or α-olefin-maleic anhydride copolymer is hydroxyalkyl (meth) Resin etc. which carried out half-esterification with the (meth)acrylic compound which have hydroxyl groups, such as an acrylate, are mentioned.

Examples of short wavelength absorption photoinitiators include 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropane- 1-one, 1-hydroxycyclohexylphenylketone, 2-methyl-1[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- Acetophenone-based photopolymerization initiators such as (4-morpholinophenyl)-butan-1-one; Benzophenone-based photopolymerization initiators such as polymerization initiators, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylate benzophenone, and 4-benzoyl-4'-methyldiphenylsulfide; thioxanthone-based photopolymerization initiators such as oxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, and 2,4-diisopropylthioxanthone; 2,4,6-trichloro Rho-s-triazine, 2-phenyl-4,6-bis(trichloromethyl)-s-triazine, 2-(p-methoxyphenyl)-4,6-bis(trichloromethyl)-s- Triazine, 2-(p-tolyl)-4,6-bis(trichloromethyl)-s-triazine, 2-piperonyl-4,6-bis(trichloromethyl)-s-triazine, 2 ,4-bis(trichloromethyl)-6-styryl-s-triazine, 2-(naphtho-1-yl)-4,6-bis(trichloromethyl)-s-triazine, 2-( 4-Methoxy-naphtho-1-yl)-4,6-bis(trichloromethyl)-s-triazine, 2,4-trichloromethyl-(piperonyl)-6-triazine, 2, triazine-based photopolymerization initiators such as 4-trichloromethyl(4'-methoxystyryl)-6-triazine, borate-based photopolymerization initiators, carbazole-based photopolymerization initiators, imidazole-based photopolymerization initiators, and the like. there is.

Others, 1) The coating solution used in the coating process may further include a pigment dispersant, a surfactant, and the like as additives.

The substrate SUB is a base layer of the color conversion filter substrate 10 in which the color filter layer CF and the color conversion layer CC are sequentially stacked, and is a light-transmitting element capable of transmitting visible light, the material of which is used or It may be appropriately selected depending on the process. For example, the substrate SUB may be a glass substrate or a transparent plastic substrate, and may be appropriately selected according to the use of a flat panel display, a curved display, a flexible display, or the like.

Examples of the polymer constituting the transparent plastic substrate 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 color conversion filter substrate 10 may further include a light blocking pattern BM disposed on the substrate SUB. The light blocking pattern BM may be disposed to overlap a gate electrode (not shown), a data electrode (not shown), etc. defining the pixel PX of the display device, and as shown, on an arbitrary cross-section, each color It may be disposed between the filter units CF1 , CF2 , and CF3 .

FIG. 3 shows an embodiment 101 of the display device 100 of FIG. 1 .

Referring to FIG. 3 , in the display apparatus 101 , the barrier ribs CW2 and the second conversion unit may each include a combination of two types of color conversion materials. For example, one kind of color conversion material may be a green conversion material (P1) that absorbs blue light (B) and excites green light (G), and among the two types of color conversion materials, one is a green conversion material ( P1), and the other one may be a red conversion material P2 that absorbs green light (G) and excites red light (R).

Table 3 shows that the first color conversion unit CC1 has a pattern in which second barrier ribs CW2 that absorb blue light B and green light G and excite red light R are arranged to be spaced apart from each other, The second color conversion unit CC2 absorbs both the green light G and the blue light B, and the display device (CASE 1) having a color conversion filter substrate 10 composed of a single barrier rib that excites the red light (R) of , red, green, and blue luminance measurement results.

At this time, the green filter unit CF1 is disposed on the first color conversion unit CC1 , the red filter unit CF2 is disposed on the second color conversion unit CC2 , and the light source LS is white light W is emitted, and the white light W emitted from the light source LS is incident on the blue filter unit CF3 without passing through the color conversion unit.

Table 4 shows the results of measuring the color gamut of the display device 101 of CASE 1.

red luminance green luminance blue luminance CASE 1 100% 77% 100%

Adobe Overlay Ratio DCI overlap ratio BT2020 overlap ratio CASE 1 99% 99% 85%

Table 5 shows the results of measuring color gamut in a control display device without a color conversion layer (CC) (CASE 2, Red Pixel: Ref. (CW14), Green Pixel: Ref. (CW 14) of FIG. 2) . In the control display device (CASE 2), the white light W emitted from the light source LS does not pass through the color conversion layer CC, and the green filter unit CF1, the red filter unit CF2, and the blue filter unit (CF3) was incident.

Adobe Overlay Ratio DCI overlap ratio BT2020 overlap ratio CASE 2 96% 98% 77%

Referring to the comparative experimental results shown in Tables 3 to 5, it can be seen that the display device (CASE 1) of FIG. 3 has superior color gamut compared to the control display device (CASE 2).

4 shows another embodiment 102 of the display device 100 of FIG. 1 .

Hereinafter, only the differences between the display device 102 shown in FIG. 4 and the display device 101 shown in FIG. 3 will be described in detail, and detailed descriptions of other components have been described above, so they will be omitted. do it with

The display device 102 of FIG. 4 is similar to the display device 101 of FIG. 3 in that the partition walls CW2 and the second color conversion unit CC2 include one type of red conversion material P2. There is a difference.

In the display device 101 of FIG. 3 , the barrier ribs CW2 and the second color conversion unit CC2 each include one type of green conversion material P1 and one type of red conversion material P2 .

FIG. 5 shows another embodiment 103 of the display device 100 of FIG. 1 .

Hereinafter, only the differences between the display device 103 shown in FIG. 5 and the display device 102 shown in FIG. 4 will be described in detail, and detailed descriptions of other components have been previously described, so they will be omitted. do it with

In the display device 103 of FIG. 5 , the second color conversion unit CC2 includes one type of green conversion material P1 and one type of red conversion material P2 , the display apparatus of FIG. 4 . (102) is different.

In the display device 102 of FIG. 4 , the partition walls CW2 and the second color conversion unit CC2 include one type of red conversion material P2 .

Although the embodiments have been described above with reference to the accompanying drawings, the invention is not limited to the above embodiments, and may be manufactured in various different forms by combining the contents disclosed in each embodiment, and is common in the technical field 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, 101, 102, 103, 104: display device
SUB: Substrate
CF: color filter layer
CC: color conversion layer CW: barrier rib
BM: shading pattern
P1, P2: color conversion material
CN: cover film
PX: Pixel
S-PX: sub-pixel

Claims (15)

a color filter layer including a first color filter unit and a second color filter unit emitting a color different from that of the first color filter unit; and
a color conversion layer including 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;
The first color conversion unit includes a pattern comprising barrier ribs spaced apart from each other and exposing the first color filter unit between the barrier ribs;
The first color conversion unit and the second color conversion unit include a color conversion material that excites light in the same wavelength band,
The first color conversion unit and the second color conversion unit include a red conversion material and a green conversion material,
Color conversion filter substrate. According to claim 1,
The second color conversion unit is composed of a single partition wall that does not include the pattern,
Color conversion filter substrate. According to claim 1,
When the total area of the opposite surface of the first color filter unit facing the first color conversion unit is defined as a unit area, the total volume of the first color conversion unit per unit area is equal to the total volume of the second color conversion unit per unit area small compared to the total volume,
Color conversion filter substrate. According to claim 1,
A color conversion filter substrate satisfying the following formula (1):

Equation (1)
In the above formula (1),
A1 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the first color conversion unit,
A2 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the second color conversion unit. 5. The method of claim 4,
A color conversion filter substrate satisfying the following formula (2):

Equation (2)
In the above formula (2),
A1 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the first color conversion unit,
A2 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the second color conversion unit. 6. The method of claim 5,
A color conversion filter substrate satisfying the following formula (3):

Equation (3)
In the above formula (3),
A1 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the first color conversion unit,
A2 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the second color conversion unit. According to claim 1,
The color filter layer further includes a third color filter unit emitting a different color from the first color filter unit and the second color filter unit,
The color conversion layer includes only the first color conversion unit and the second color conversion unit, and the first color conversion unit absorbs light of a shorter wavelength than light emitted from the second color filter unit, and the second color conversion unit to excite the light emitted from the color filter unit,
Color conversion filter substrate. According to claim 1,
The first color filter unit receives the light passing through the first color conversion unit and emits green light,
The second color filter unit receives the light passing through the second color conversion unit and emits red light,
The first color conversion unit absorbs light of a shorter wavelength than the light emitted from the second color filter unit and excites the light emitted from the second color filter unit,
Color conversion filter substrate. a color filter layer including a first color filter unit, a second color filter unit emitting a color different from that of the first color filter unit; a first color conversion unit disposed on the first color filter unit; a color conversion filter substrate including a color conversion layer including a second color conversion unit disposed on the color filter unit; and
a light source emitting light to the color conversion filter substrate; including,
The total volume of the first color conversion unit per pixel is smaller than the total volume of the second color conversion unit per pixel;
The first color conversion unit and the second color conversion unit include a color conversion material that excites light in the same wavelength band,
The first color conversion unit and the second color conversion unit include a red conversion material and a green conversion material,
display device. 10. The method of claim 9,
The first color conversion unit is provided with a pattern comprising barrier ribs spaced apart from each other and exposing the first color filter unit between the barrier ribs;
display device. 10. The method of claim 9,
A display device satisfying the following formula (1):

Equation (1)
In the above formula (1),
A1 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the first color conversion unit,
A2 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the second color conversion unit. 12. The method of claim 11,
A display device satisfying the following formula (2):

Equation (2)
In the above formula (2),
A1 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the first color conversion unit,
A2 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the second color conversion unit. 13. The method of claim 12,
A display device satisfying the following formula (3):

Equation (3)
In the above formula (3),
A1 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the first color conversion unit,
A2 is the light emission intensity in the wavelength band of 615 nm to 670 nm of the second color conversion unit. 10. The method of claim 9,
The color filter layer further includes a third color filter unit emitting a different color from the first color filter unit and the second color filter unit,
The color conversion layer consists of only the first color conversion unit and the second color conversion unit,
The first color filter unit is disposed to overlap the first sub-pixel;
The second color filter unit is disposed to overlap the second sub-pixel,
The third color filter unit is disposed to overlap the third sub-pixel;
The first color conversion unit absorbs light of a shorter wavelength than the light emitted from the second color filter unit and excites the light emitted from the second color filter unit,
display device. 10. The method of claim 9,
The light source emits white light,
The first color filter unit receives the light passing through the first color conversion unit and emits green light, and the second color filter unit receives the light passing through the second color conversion unit and emits red light,
The first color conversion unit absorbs light of a shorter wavelength than the light emitted from the second color filter unit and excites the light emitted from the second color filter unit,
display device.

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