KR20150078331A - Organic light emitting diode display device - Google Patents

Abstract

The present invention provides an organic light emitting diode display device comprising: pixels including red, green, and blue sub pixels; light emitting diodes respectively formed on the red, green, and blue sub pixels, and emitting white light; and red, green, and blue color filters respectively formed on the red, green, and blue sub pixels, wherein the red color filter comprises a first color conversion material which absorbs blue light or mixed light of blue and green, and emits red light, and the green color filter comprises a second color conversion material which absorbs the blue light and emits yellow light.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting diode (OLED) display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting diode (OLED) display device, and more particularly, to an organic light emitting diode display device capable of improving light efficiency and color gamut.

2. Description of the Related Art Flat panel displays having excellent characteristics such as thinning, lightening, and low power consumption have been widely developed and applied to various fields.

Among flat panel display devices, an organic light emitting diode (OLED) display device, also referred to as an organic electroluminescent display device or an organic electroluminescent display device, includes a cathode that is an electron injection electrode and a cathode that is a hole injection electrode Injects charges into the light-emitting layer formed between the electrodes, and pairs the electrons and holes, and then extinguishes and emits light. Such an organic light emitting diode display device can be formed not only on a flexible substrate such as a plastic but also because it has a large contrast ratio and response time of several microseconds since it is a self- It is easy to manufacture and design a driving circuit because it is easy to operate, is not limited in viewing angle, is stable at a low temperature, and can be driven at a relatively low voltage of 5 V to 15 V DC.

In such an organic light emitting diode display device, one pixel includes red, green, and blue subpixels, and the red, green, and blue subpixels include an organic emission layer that emits red, green, and blue light, respectively , And displays an image by combining light emitted from each sub-pixel.

However, the organic light emitting layers emitting red, green and blue light are formed of different materials and have different characteristics. Accordingly, red, green, and blue subpixels have different luminous efficiencies and different lifetimes.

To solve this problem, a structure using a color filter for an organic light emitting diode display device has been proposed and studied. That is, one pixel includes red, green, and blue subpixels, and red, green, and blue subpixels each include an organic light emitting layer that emits white light, and red, green, and blue subpixels include red, Green, and blue light are output while white light emitted from each sub-pixel passes through red, green, and blue color filters including a color filter, and red, green, and blue light are combined to display an image. At this time, color matching of the white light emitted from the organic light emitting layer and the color filter is required to realize an accurate color.

BACKGROUND ART [0002] Color filters are widely used in liquid crystal display devices. White light output from a light source of a liquid crystal display device and white light output from an organic light emitting layer of an organic light emitting diode display have a peak position and a band width of red, width). Therefore, the color filter of the organic light emitting diode display device must have characteristics different from those of the color filter of the liquid crystal display device, and the characteristics can be controlled by adjusting the concentration or the film thickness of the colorant.

The color filter of the organic light emitting diode display device is required to have a color filter which is relatively darker than that of the color filter of the liquid crystal display device, and a thick color filter can be realized by thickening the film thickness.

FIG. 1 is a view showing a color reproduction ratio of an organic light emitting diode display device including a conventional color filter on a chromaticity diagram of International Commission on Illumination (CIE) 1931, FIG. 2 (a) FIG. 2B is an enlarged view of the red coordinates in the chromaticity diagram of CIE 1931 of FIG. 1. FIG. At this time, the color specification of ITU-R BT.709, which is a high definition television (HDTV) standard, and the high color reproduction standard of digital cinema initiative (DCI), which is a digital cinema system standard, are shown together.

Here, the first example (RA1) of the conventional organic light emitting diode display device includes red, green, and blue color filters of a general thickness, and the second example (RA1) includes a blue color having the same thickness as the first example Filter and a green color filter that is thicker than the first example (RA1). For example, the green color filter of the second example RA1 may have a thickness of about 1.5 times the green color filter of the first example RA1.

As shown in FIGS. 1, 2A and 2B, the color reproduction ratios of the first example RA1 and the second example RA2 satisfy the color specification of the ITU-R BT.709. In the first example RA1, The color reproduction rate of DCI does not satisfy the color specification of DCI.

That is, in the color specification of DCI, the red coordinates are (0.68, 0.32) and the green coordinates are (0.265, 0.690), the red coordinates of the first example RA1 are (0.667, 0.332) , Assuming that the color space area of DCI is 100%, the first example (RA1) has a color reproduction ratio of 92.3%.

On the other hand, when the thickness of the green color filter is increased as in the second example RA2, the red coordinates of the second example RA2 are (0.679, 0.320) and the green coordinates are (0.263, 0.689) The second comparative example (RA2) has a color reproduction rate of 99.8%. Therefore, the second example RA2 almost satisfies the DCI color specification.

However, in the second example (RA2), since the thickness of the color filter becomes thick, the transmittance decreases and the luminance decreases. In other words, the luminance of the second example (RA2) corresponding to the red coordinate is about 77% based on the first example (RA1), and the luminance of the second example (RA2) Is about 75%.

In addition, it is not easy to form a thick color filter, and since the step height increases due to the thickness of the color filter, there is a problem that the formation of subsequent films is not smooth.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an organic light emitting diode display device capable of improving light efficiency and achieving a high color reproducibility.

It is another object of the present invention to provide an organic light emitting diode display device capable of increasing brightness.

According to an aspect of the present invention, there is provided an organic light emitting diode display comprising: a pixel including red, green and blue sub-pixels; A light emitting diode formed on each of the red, green and blue sub-pixels and emitting white light; Green, and blue color filters formed on the red, green, and blue sub-pixels, respectively, and the red color filter includes a first color conversion material that absorbs blue light or mixed light of blue and green to emit red light And the green color filter includes a second color conversion material that absorbs blue light and emits yellow light.

The first color conversion material includes a yellow conversion material and a red conversion material, and the second color conversion material includes a yellow conversion material.

The yellow conversion material includes a coumarin-based fluorescent dye, and the red conversion material includes a perylene-based fluorescent dye.

Wherein the red color filter comprises a red color filter pattern and a first color conversion pattern separated from the red color filter pattern and made of the first color conversion material, the green color filter comprising a green color filter pattern and the green color filter pattern And a second color conversion pattern formed of the second color conversion material.

Wherein the red color filter comprises a red color filter pattern containing the first color conversion material and the green color filter comprises a green color filter pattern containing the second color conversion material.

The pixel further includes a white sub-pixel.

The thickness of the green color filter is 10% greater than the thickness of the red color filter.

According to the present invention, in an organic light emitting diode display device including red, green, and blue color filters and a light emitting diode that emits white light, the red and green color filters include a color conversion material, And the light efficiency and color purity can be improved.

Further, since the color filter can be formed in a general thickness range, the process is easy and the problem caused by the step difference can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a color reproduction ratio of an organic light emitting diode display device including a conventional color filter on a CIE 1931 chromaticity distribution diagram. FIG.
FIG. 2A is an enlarged view of the green coordinates in the CIE 1931 chromaticity distribution diagram of FIG. 1, and FIG. 2B is an enlarged view of the red coordinates in the CIE 1931 chromaticity diagram of FIG.
3 is a cross-sectional view schematically showing an organic light emitting diode display device according to an embodiment of the present invention.
4 is a schematic view illustrating a process of emitting light to the outside through a red sub-pixel and a green sub-pixel in an organic light emitting diode display according to an embodiment of the present invention.
5 is a cross-sectional view schematically illustrating an organic light emitting diode display device according to another embodiment of the present invention.
6 is a schematic view illustrating a process of emitting light to the outside through a red sub-pixel and a green sub-pixel in an organic light emitting diode display according to another embodiment of the present invention.
FIG. 7 is a diagram showing a spectrum change of light from a light emitting diode for each color conversion material applied in accordance with an embodiment of the present invention. FIG.
8A and 8B are diagrams showing spectra of the final light passing through the color filter for each color conversion material when the color conversion material is applied to the red and green subpixels according to the embodiment of the present invention.
9 is a graph showing a color reproduction ratio of an organic light emitting diode display according to an embodiment of the present invention on a CIE 1931 chromaticity distribution diagram.
FIG. 10A is an enlarged view of the green coordinates in the CIE 1931 chromaticity distribution diagram of FIG. 9, and FIG. 10B is an enlarged view of the red coordinates in the CIE 1931 chromaticity distribution diagram of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a cross-sectional view schematically showing an organic light emitting diode display device according to an embodiment of the present invention, and shows a region corresponding to one pixel, and one pixel includes red, green, blue, and white sub- pixel regions corresponding to the respective pixel regions.

3, the organic light emitting diode display according to an exemplary embodiment of the present invention includes a first substrate 110, a thin film transistor T, a passivation layer 120, a color filter layer 130, an overcoat layer 140, A light emitting diode (De), a sealing layer (160), and a second substrate (170).

The first substrate 110 and the second substrate 170 are opposed to each other. The first substrate 110 is made of a transparent material, and the first substrate 110 and the second substrate 170 emit light to the outside through the first substrate 110. (bottom emission type) organic light emitting diode display device. For example, the first substrate 110 may be formed of glass or plastic.

A thin film transistor T is formed on the first substrate 110 in each pixel region. The thin film transistor T includes a switching thin film transistor and a driving thin film transistor, and each of the switching thin film transistor and the driving thin film transistor includes a gate electrode, a semiconductor layer, and a source and a drain electrode.

Although not shown, a gate wiring and a data wiring connected to the switching thin film transistor are formed on the first substrate 110, and a storage capacitor connected to the switching thin film transistor and the driving thin film transistor is formed.

A protective film 120 is formed on the thin film transistor T to cover the thin film transistor T.

A color filter layer 130 is formed on the passivation layer 120. The color filter layer 130 includes red, green and blue color filters 132, 134 and 136 respectively corresponding to red, green and blue sub-pixels. The red color filter 132 includes red color filter patterns 132a, The green color filter 134 includes the first color conversion pattern 132b and the green color filter 134 includes the green color filter pattern 134a and the second color conversion pattern 134b. The blue color filter 136 includes only a blue color filter pattern.

The first color conversion pattern 132b and the second color conversion pattern 134b have characteristics of light absorbing and luminescence and are formed by absorbing light of a short wavelength and then shifting to light of a long wavelength, material. Here, the first color conversion pattern 132b includes a color conversion material that absorbs blue light or mixed light of blue and green to emit red light, and the second color conversion pattern 134b absorbs blue light to emit yellow light Color conversion material. At this time, the first color conversion pattern 132b may include a yellow conversion material and the red conversion material, and the second color conversion pattern 134b may include a yellow conversion material.

Such a color conversion material has a nanometer size that does not cause Rayleigh scattering and has excellent optical characteristics after film formation for the patterning process, that is, a fluorescent dye having a high peak wavelength and intensity fluorescent dye. For example, coumarin-based fluorescent dyes may be used as the yellow conversion material and perylene-based fluorescent dyes may be used as the red conversion material.

The thickness of the first and second color conversion patterns 132b and 134b is about 2 to 3 micrometers and the thickness of the red, green, and blue color filter patterns 132a, 134a, and 136 is about 2 to 3 micrometers And the thickness of the green color filter pattern 134b is preferably about 10% greater than the thickness of the red and blue color filter patterns 132a and 136. [

Although not shown, a black matrix may be formed on the protective layer 120 to surround the red, green, and blue color filters 132, 134, and 136, respectively, corresponding to the boundaries of the pixel regions.

On the other hand, an overcoat layer 140 is formed on the color filter layer 130. The overcoat layer 140 has a flat surface and covers and protects the color filter layer 130. Here, since the color filter layer is not formed in the pixel region corresponding to the white sub-pixel, only the overcoat layer 140 is located in the pixel region corresponding to the white sub-pixel.

A light emitting diode (De) including a first electrode 152, an organic light emitting layer 154, and a second electrode 156 is formed on the overcoat layer 140.

At this time, the first electrode 152 is formed of a conductive material having a relatively large work function as an anode, and the second electrode 156 is formed of a conductive material having a relatively small work function as a cathode. For example, the first electrode 152 may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The second electrode 154 may have a reflective characteristic or may be formed of an opaque metal material. In this case, light emitted from the organic light emitting layer 154 is emitted to the outside through the first electrode 152 and the first substrate 110.

Although not shown, the first electrode 152 is patterned for each pixel region and connected to the thin film transistor T, and the second electrode 156 is formed on the entire surface of the first substrate 110.

The organic light emitting layer 154 is disposed between the first electrode 152 and the second electrode 156 and includes a hole transporting layer and a light emitting material layer ) And an electron transporting layer (hereinafter referred to as an electron transporting layer), and may further include a hole injecting layer below the hole transporting layer and an electron injecting layer above the electron transporting layer .

The light emitted from the organic light emitting layer 154 includes light in the yellow-green wavelength band 520 to 590 nm and light in the blue wavelength band 430 to 490 nm. Accordingly, the light in the yellow-green wavelength band 520 to 590 nm and the light in the blue wavelength band 430 to 490 nm are mixed to emit the white light to the outside.

An encapsulating layer 160 for protecting the light emitting diode De from moisture or oxygen from the outside is formed on the upper part of the light emitting diode De and a second substrate 170 is disposed on the encapsulating layer 160 , The organic light emitting diode display device is encapsulated. The sealing layer 160 may be an ultraviolet curing sealant (UV sealant) or a frit sealant, or may have a laminated structure of an inorganic film / organic film / inorganic film.

At this time, the second substrate 190 may be made of opaque material, for example, opaque glass or plastic.

In the embodiment of the present invention, one pixel is composed of red, green, blue, and white sub-pixels. However, one pixel may be composed of red, green, and blue sub-pixels.

FIG. 4 is a schematic view illustrating a process of emitting light to the outside through a red sub-pixel and a green sub-pixel in an organic light emitting diode display according to an embodiment of the present invention. Referring to FIG. 4, Only. As described above, the light emitting diode of the present invention emits white light mixed with light in the yellow-green wavelength band and light in the blue wavelength band to the outside.

4, the blue light B and the yellow-green light YG of the white light emitted from the light emitting diode De of the red sub-pixel are converted into the first color conversion pattern 132b of the red color filter 132 And is converted into red light R and is transmitted to the red color filter pattern 132a. Accordingly, the red light R having improved color purity and light efficiency is finally output.

On the other hand, in the green sub-pixel, the yellow-green light YG of the white light emitted from the light emitting diode De passes through the second color conversion pattern 134b of the green color filter 134 as it is and passes through the green color filter pattern 134a And the blue light B is converted into the yellow light Y while passing through the second color conversion pattern 134b of the green color filter 134 and then transmitted to the green color filter pattern 134a. Therefore, the green light G having improved color purity and light efficiency is finally output.

As described above, in the organic light emitting diode display device according to the embodiment of the present invention, the red color filter 132 and the green color filter 134 include the color filter patterns 132a and 132b and the color conversion patterns 132b and 134b , Color purity and light efficiency can be increased.

FIG. 5 is a cross-sectional view schematically showing an organic light emitting diode display device according to another embodiment of the present invention, and shows a region corresponding to one pixel. The organic light emitting diode display according to another embodiment of the present invention has the same structure as the previous embodiment except for the color filter layer, and a description of the same portions will be briefly made.

5, the organic light emitting diode display according to another embodiment of the present invention includes a first substrate 210, a thin film transistor T, a passivation layer 220, a color filter layer 230, an overcoat layer 240 ), A light emitting diode (De), a sealing layer 260, and a second substrate 270.

A thin film transistor T is formed in each pixel region on the first substrate 210 and a protective film 220 is formed on the thin film transistor T to cover the thin film transistor T.

A color filter layer 230 is formed on the protective layer 220. The color filter layer 230 includes red, green and blue color filters 232, 234 and 236 respectively corresponding to red, green and blue sub-pixels, and the red color filter 232 includes red And a green color filter 234 includes a green color filter pattern containing a second color conversion material. The blue color filter 236 includes a blue color filter pattern that does not contain a color conversion material.

Here, the first color conversion material absorbs blue light or mixed light of blue and green to emit red light, and the second color conversion material absorbs blue light to emit yellow light. At this time, the first color conversion material may include a yellow conversion material and the red conversion material, and the second color conversion material may include a yellow conversion material. For example, coumarin-based fluorescent dyes may be used as the yellow conversion material and perylene-based fluorescent dyes may be used as the red conversion material.

The thickness of the green color filter 234 is less than the thickness of the red and blue color filters 232 and 236 by about 10 % Thick is preferable.

On the other hand, an overcoat layer 240 is formed on the color filter layer 230. The overcoat layer 240 has a flat surface and covers and protects the color filter layer 230. Here, since no color filter layer is formed in the pixel region corresponding to the white sub-pixel, only the overcoat layer 240 is located in the pixel region corresponding to the white sub-pixel.

A light emitting diode De including the first electrode 252, the organic light emitting layer 254, and the second electrode 256 is formed on the overcoat layer 240.

At this time, the first electrode 252 is formed of a conductive material having a relatively large work function as an anode, and the second electrode 256 is formed of a conductive material having a relatively small work function as a cathode. For example, the first electrode 252 may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The second electrode 254 may have a reflective characteristic or may be formed of an opaque metal material. In this case, the organic light emitting diode display device is a bottom emission type in which light emitted from the organic emission layer 254 is emitted to the outside through the first electrode 252 and the first substrate 210.

Although not shown, the first electrode 252 is patterned for each pixel region and connected to the thin film transistor T, and the second electrode 256 is formed on the entire surface of the first substrate 210.

The organic light emitting layer 254 is disposed between the first electrode 252 and the second electrode 256 and includes a hole transporting layer and a light emitting material layer ) And an electron transporting layer (hereinafter referred to as an electron transporting layer), and may further include a hole injecting layer below the hole transporting layer and an electron injecting layer above the electron transporting layer .

The light emitted from the organic light emitting layer 254 includes light in the yellow-green wavelength band 520 to 590 nm and light in the blue wavelength band 430 to 490 nm. Accordingly, the light in the yellow-green wavelength band 520 to 590 nm and the light in the blue wavelength band 430 to 490 nm are mixed to emit the white light to the outside.

An encapsulating layer 260 for protecting the light emitting diode De from moisture or oxygen from the outside is formed on the upper part of the light emitting diode De and a second substrate 170 is disposed on the encapsulating layer 160 , The organic light emitting diode display device is encapsulated.

6 is a schematic view illustrating a process of emitting light to the outside through a red sub-pixel and a green sub-pixel in an organic light emitting diode display according to another embodiment of the present invention. Referring to FIG. 6, Filter only. As described above, the light emitting diode of the present invention emits white light mixed with light in the yellow-green wavelength band and light in the blue wavelength band to the outside.

6, the blue light B and the yellow-green light YG of the white light emitted from the light emitting diode De pass through the red color filter 232, (R) and output to the outside. Accordingly, the red light R having improved color purity and light efficiency is finally output.

On the other hand, in the green sub-pixel, the yellow-green light YG among the white light emitted from the light emitting diode De passes through the green color filter 234 as it is and the blue light B is outputted through the green color filter 234 And is converted into yellow light (Y) by the second color conversion material and is output to the outside. Thus, the green light G with improved light efficiency is finally output.

As described above, in the organic light emitting diode display device according to another embodiment of the present invention, the red color filter 232 and the green color filter 234 include a color conversion material therein to increase the light efficiency.

FIG. 7 is a diagram showing a spectrum change of light from a light emitting diode for each color conversion material applied in accordance with an embodiment of the present invention. FIG.

In this case, the reference Ref represents the spectrum of the white light emitted from the light emitting diode, Case 1 (C1) represents the spectrum of light to which the yellow conversion material is applied to the light emitting diode, Case 2 (C2) (C3) represents the spectrum of light to which the yellow conversion material and the red conversion material are applied to the light emitting diode.

As shown in Fig. 7, in case 1 (C1), since the blue light B is absorbed and the yellow light Y is emitted, the intensity of the blue peak of about 450 nm in the spectrum of the reference Ref intensity decreases and the intensity of the yellow peak at about 550 nm increases.

The intensity of the blue peak of about 450 nm and the yellow peak of about 550 nm is decreased and the red peak of about 530 nm is obtained by absorbing the blue light B and the green light G to emit the red light R red peak) is increased.

On the other hand, in case 3 (C3), the yellow conversion material and the red conversion material are mixed to show the intermediate characteristic spectral change, and the spectral change is different according to the mixing ratio of the yellow conversion material and the red conversion material.

8A and 8B are diagrams showing a spectrum of final light passing through a color filter for each color conversion material when a color conversion material is applied to red and green subpixels according to an embodiment of the present invention. FIG. 8B shows a spectrum of light transmitted through the material and the red color filter, and FIG. 8B shows a spectrum of light transmitted through the color conversion material and the green color filter.

As described above, the reference Ref represents the spectrum of the white light emitted from the light emitting diode, Case 1 (C1) represents the spectrum of light to which the yellow conversion material is applied to the light emitting diode, Case 2 (C2) (C3) represents a spectrum of light to which a yellow conversion material and a red conversion material are applied to a light emitting diode.

As shown in FIG. 8A, when the red color material is applied to the red color filter, the color purity increases at 2 (C2). When the yellow color conversion material and the red color conversion material are applied, 3 (C3) It can be confirmed that the color purity increases.

On the other hand, as shown in FIG. 8B, it can be seen that the color purity increases in 1 (C1) when the yellow color conversion material is applied to the green color filter.

Therefore, when the color conversion material is applied, the intensity of the wavelength corresponding to the color of each sub-pixel increases and the intensity of the other wavelength decreases, thereby improving the light efficiency and color purity.

On the other hand, in order to make the color purity and the light efficiency with other sub-pixels uniform, it is preferable that the red sub-pixel and the red color filter are applied with the yellow conversion material and the red conversion material.

FIG. 9 is a diagram showing the color reproduction ratio of the organic light emitting diode display according to the embodiment of the present invention on a CIE 1931 chromaticity distribution diagram, FIG. 10A is an enlarged view of the green coordinates in the CIE 1931 chromaticity diagram of FIG. 9, Is an enlarged view of the red coordinates in the CIE 1931 chromaticity diagram of Fig. At this time, the color reproduction ratio of the first example (RA1) including the color specification of ITU-R BT.709 as the HDTV standard, the high color reproduction standard of DCI as the digital cinema system standard, do.

As shown in Fig. 9 and Figs. 10A and 10B, the color reproducibility of the embodiment (Ex1) satisfies the color specification of the ITU-R BT.709 by improving the color purity of the red and green sub-pixels, The color specification is almost satisfied.

That is, assuming that the red coordinate of the embodiment Ex1 is (0.679, 0.319), the green coordinate is (0.266, 0.690) and the color space area of DCI is 100%, the embodiment (Ex1) Recall rate.

In this case, the luminance of the embodiment Ex1 corresponding to the red coordinates is about 99% based on the first example RA1, and the luminance of the embodiment Ex1 corresponding to the green coordinates corresponds to the luminance of the first example RA1 About 90%.

Therefore, in the embodiment of the present invention, the color filter layer includes the color conversion material, thereby enhancing the light efficiency while having a high color reproduction rate that can satisfy the DCI standard.

The color reproduction ratios of the first example RA1 and the second example RA2 satisfy the color specification of the ITU-R BT.709, and the color reproduction rate of the first example RA1 does not satisfy the color specification of the DCI.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. You can understand that you can

110: first substrate T: thin film transistor
120: protective film 130: color filter layer
132: Red color filter 134: Green color filter
136: blue color filter 140: overcoat layer
152: first electrode 154: organic light emitting layer
156: second electrode De: light emitting diode
160: sealing layer 170: second substrate

Claims (7)

A pixel including red, green and blue sub-pixels;
A light emitting diode formed on each of the red, green and blue sub-pixels and emitting white light;
Green, and blue sub-pixels formed on the red, green, and blue sub-
Lt; / RTI >
Wherein the red color filter includes a first color conversion material that absorbs blue light or mixed light of blue and green to emit red light and the green color filter includes a second color conversion material that absorbs blue light and emits yellow light The organic light emitting diode display device comprising:
The method according to claim 1,
Wherein the first color conversion material comprises a yellow conversion material and a red conversion material, and the second color conversion material comprises a yellow conversion material.
3. The method of claim 2,
Wherein the yellow conversion material comprises a coumarin-based fluorescent dye, and the red conversion material comprises a perylene-based fluorescent dye.
The method according to claim 1,
Wherein the red color filter comprises a red color filter pattern and a first color conversion pattern separated from the red color filter pattern and made of the first color conversion material, the green color filter comprising a green color filter pattern and the green color filter pattern And a second color conversion pattern separated from the first color conversion material and made of the second color conversion material.
The method according to claim 1,
Characterized in that the red color filter comprises a red color filter pattern containing the first color conversion material and the green color filter comprises a green color filter pattern containing the second color conversion material. Display device.
The method according to claim 1,
Wherein the pixel further comprises a white sub-pixel.
The method according to claim 1,
Wherein the thickness of the green color filter is 10% larger than the thickness of the red color filter.

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