KR20110018097A - Energy producible display device - Google Patents

Abstract

PURPOSE: An energy producible display device is provided to generate electrical energy by using a wavelength band which is absorbed to exclude a wavelength band which is transmitted in a color filter. CONSTITUTION: An image panel(200) displays an image through an image signal, and a color filter(300) gives colors to an image by transmitting a light of a certain color. An organic photoconductive conversion layer(330) is formed between color filter electrodes and selectively photo-converts the light except wavelength bands except wavelength band. Plural color units(300R) correspond to an image of the image panel and is included in the organic photoconductive conversion layer.

Description

Energy Producible Display Device

The present invention relates to a display device capable of generating energy.

The display device is a device for displaying an image by controlling the amount of light in units of pixels according to an input image signal, and includes a liquid crystal display (LCD) and a polymer dispersed liquid crystal display (PDLCD). Organic Light Emitting Diodes (OLED) display devices are being actively researched.

In such a display device, a color filter is used to make a full color image. For example, liquid crystal panels used in LCDs consist of two glass substrates that are constantly aligned with each other. One is a color filter substrate and the other is a drive substrate. Each pick unit of the color filter has a color element of red (R), green (G), and blue (B). The red color component transmits light of the red wavelength band and absorbs light of the remaining green and blue wavelength bands. In addition, the green color component transmits light in the green wavelength band, absorbs light in the remaining red and blue wavelength bands, and the blue color component transmits light in the blue wavelength band, and absorbs light in the remaining red and green wavelength bands. do.

On the other hand, as the display device becomes large, implementing low power consumption has become a technical issue. In addition, as the spread of mobile devices such as mobile phones has expanded, it is becoming an important technical issue to lengthen the driving time of mobile devices. Accordingly, a method for effectively utilizing the limited energy in the device is required.

An object of the present invention is to provide a display device capable of generating electrical energy using an absorbed wavelength band other than the wavelength band transmitted by a color filter.

According to an aspect, a display apparatus includes: an image panel on which an image is displayed by an image signal; And a color filter which transmits light of a predetermined color to impart color to the image. The color filter includes a first electrode and a second electrode formed to be spaced apart from each other, an organic photoelectric conversion film formed between the first electrode and the second electrode, the organic photoelectric conversion film is a pixel of the image panel It includes a plurality of corresponding color units, and selectively absorbs light of a wavelength band other than the wavelength band of light transmitted for each color unit to photoelectric conversion.

The organic photoelectric conversion film may include a P-type organic material layer formed on the first electrode and an N-type organic material layer formed on the P-type organic material layer.

Each of the P-type organic material layer and the N-type organic material layer may be formed of an organic material that absorbs light of at least one band among red, green, and blue to cause photoelectric conversion.

Interposed between the P-type organic material layer and the N-type organic material layer, and may further include an intrin layer formed by co-depositing the P-type organic material and the N-type organic material.

The display device may further include a buffer layer interposed between at least one of the first electrode and the P-type organic material layer and between the second electrode and the N-type organic material layer.

The organic photoelectric conversion film may further include an organic material layer having another PN junction structure stacked on the N-type organic material layer.

The plurality of color units may include a red unit, a green unit, and a blue unit.

The red unit transmits red light and absorbs green and blue light to photoelectric conversion. The green unit transmits green light and absorbs red and blue light to photoelectric conversion. The blue unit transmits blue light and absorbs red and green light to photoelectric conversion. I can convert it.

The red unit may be formed by stacking a green photoelectric conversion layer absorbing green light and a blue photoelectric conversion layer absorbing blue light. A conductive layer may be formed between the green photoelectric conversion layer and the blue photoelectric conversion layer.

Alternatively, the red unit may be formed of a single layer of a green-blue photoelectric conversion layer that absorbs green light and blue light.

The green unit may be formed of a double layer of a red photoelectric conversion layer absorbing red light and a blue photoelectric conversion layer absorbing blue light. A conductive layer may be formed between the red photoelectric conversion layer and the blue photoelectric conversion layer.

Alternatively, the green unit may be formed of a single layer of a red-blue photoelectric conversion layer that absorbs red light and blue light.

The blue unit may be formed of a double layer of a red photoelectric conversion layer absorbing red light and a green photoelectric conversion layer absorbing green light. A conductive layer may be formed between the red photoelectric conversion layer and the green photoelectric conversion layer.

Alternatively, the blue unit may be formed of a single layer of a red green photoelectric conversion layer that absorbs red light and green light.

The first electrode and the second electrode may be formed of a transparent conductive material. In this case, the work function of the first electrode may have a larger value than the work function of the second electrode.

The first and second electrodes are ITO, IZO, ZnO, SnO ₂ , antimony-doped tin oxide (ATO), Al-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), TiO ₂ and fluorine (FTO) -doped tin oxide) may be a transparent oxide electrode formed of at least one oxide selected from the group consisting of.

The second electrode may be a metal thin film formed of at least one metal selected from the group consisting of Al, Cu, Ti, Au, Pt, Ag, and Cr. The thickness of the second electrode may be 20 nm or less.

The image panel may be a liquid crystal panel, a PDLCD panel, an OLED panel or an E-ink panel, and the color filter may be located above or below the image panel.

According to this embodiment, by replacing the color filter used in the display device with a photoelectric conversion film, it is possible to generate electrical energy by using light blocked / absorbed by the color filter. In addition, even when the power of the display is cut off, external energy may be generated using external light. Since the electric energy can be used as an auxiliary power source for driving the display device, power consumption of the display device can be reduced, and the restrictions on the use place or time of the display device can be relaxed.

Advantages and features of the present invention and methods of performing the same will be understood more readily by reference to the following detailed description of the embodiments and the accompanying drawings. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 schematically shows a display device according to an embodiment.

Referring to FIG. 1, the display device of the present embodiment includes a color for imparting color to an image panel 200, a backlight unit 100 for irradiating light to the image panel 200, and an image formed in the image panel 200. And a filter 300.

The backlight unit 100 is for irradiating white illumination light L _W to the back of the image panel 200, and various methods such as an edge type and a direct type are known.

The image panel 200 may be disposed on the liquid crystal layer 250 between the first and second transparent substrates 220 and 280, the first and second transparent substrates 220 and 280, and the outside of the first transparent substrate 220. It is a transmissive liquid crystal panel including the formed polarizing plate 210.

The liquid crystal layer 250 is aligned in a predetermined direction by an alignment film (not shown). The first and second transparent substrates 220 and 280 are generally made of glass as a light transmitting body. A driving electrode 230 is formed on an inner surface of one of the first and second transparent substrates 220 and 280 to control the liquid crystal layer 250 on a pixel basis, and a common electrode is formed on an inner surface of the other substrate. Is formed. The driving electrode 230 may be, for example, a TFT-array layer having a plurality of thin film transistors and a plurality of pixel electrodes driven according to image information. Since the common electrode is a constant bias voltage applied to the entire liquid crystal layer 250, the first electrode 310 of the color filter 300 may function as a common electrode of the image panel 200, as described below. .

In some cases, the common electrode may be provided separately from the first electrode 310 of the color filter 300. Another polarizing plate 280 may be provided outside the second transparent substrate 280. The two polarizing plates 210 and 280 positioned above and below the image panel 200 may have the same or different polarization directions. This is determined according to the alignment direction of the liquid crystal layer 250 and whether to pass light when the voltage is applied from the driving electrode 230 or vice versa.

The color filter 300 transmits light of a predetermined color to impart color to the image. The color filter 300 is provided with the first and second electrodes 310 and 390 spaced apart from each other, the first electrode 310 and the second electrode ( The organic photoelectric conversion film 330 is formed between the 390.

The organic photoelectric conversion film 330 allows only light of a desired color to pass therethrough, and selectively absorbs light in a wavelength band other than the wavelength band of the transmitted light to perform photoelectric conversion. To this end, it may be formed of different organic materials for each of the red, green, and blue color units 300R, 300G, and 300B. The red, green, and blue color units 300R, 300G, and 300B are provided for each pixel to give full color to an image, and the red, green, and blue color units 300R, 300G, and 300B are bounded by a black mask 399. Can be achieved. The black mask 399 prevents light leakage and provides a light shield to the amorphous silicon transistor of the driving electrode 230. The black mask 399 may be formed of an inorganic material or an organic material, for example, may be formed of chromium.

The first and second electrodes 310 and 390 may be formed of a transparent conductive material. The organic photoelectric conversion layer 330 is formed of different organic materials for each of the red, green, and blue color units 300R, 300G, and 300B, but the first and second electrodes 310 and 390 are formed of these red, green, and blue colors. The color units 300R, 300G, and 300B may be commonly used.

According to the drawing, since the color filter 300 is provided on the inner surface of the second transparent substrate 270, the first electrode 310 of the color filter 300 has a driving electrode with the liquid crystal layer 250 therebetween. It is arranged to face 230. Therefore, the first electrode 310 may function as a common electrode corresponding to the driving electrode 230 with respect to the liquid crystal layer 250 by applying a predetermined bias voltage. However, the present invention is not limited thereto and a separate common electrode may be additionally formed as described above.

In this case, the work function of the first electrode 310 may have a larger value than the work function of the second electrode 390. The first and second electrodes 310 and 390 include ITO, IZO, ZnO, SnO ₂ , antimony-doped tin oxide (ATO), al-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), and TiO. _It may be a transparent oxide electrode formed of at least one oxide selected from the group consisting of ₂ and fluorine-doped tin oxide (FTO). The second electrode 390 may be a metal thin film formed of at least one metal selected from the group consisting of Al, Cu, Ti, Au, Pt, Ag, and Cr. When the second electrode 390 is formed of a metal, it may be formed to a thickness of 20 nm or less in order to secure transparency.

2 to 5 schematically show examples of the organic photoelectric conversion film in the red, green, and blue color units 300R, 300G, and 300B. Referring to these drawings, the red, green, and blue color units 300R, 300G, 300B) will be described in more detail with respect to the organic photoelectric conversion film.

Referring to FIG. 2, the organic photoelectric conversion film 330 of the red, green, and blue color units 300R, 300G, and 300B according to an example may include a P-type organic material layer 340 and an N-type having a PN junction structure. The organic material layer 360 is included. The P-type organic material layer 340 is formed on the first electrode 310, and the N-type organic material layer 360 is formed on the P-type organic material layer 340. The P-type organic material layer 340 and the N-type organic material layer 360 may pass only light of a desired color and selectively absorb light in a wavelength band other than the wavelength band of the transmitted light, so that photoelectric conversion may be performed. The green and blue color units 300R, 300G, and 300B may be formed of different organic materials.

In the red color unit 300R, the P-type organic material layer 340 and the N-type organic material layer 360 are formed of a light absorbing organic material that transmits red light and absorbs light in a wavelength band other than the red wavelength band. do. For example, the P-type organic material layer 340 or the N-type organic material layer 360 of the red color unit 300R may be formed of a material that absorbs green light and blue light to cause photoelectric conversion. For example, the P type organic material layer 340 of the red color unit 300R is formed of a P type organic material absorbing green light, and the N type organic material layer 360 is an N type organic material absorbing blue light. Can be formed. Alternatively, the P type organic material layer 340 of the red color unit 300R may be formed of a P type organic material absorbing blue light, and the N type organic material layer 360 may be formed of an N type organic material absorbing green light. Can be. Alternatively, the P-type organic material layer 340 of the red color unit 300R may be formed by mixing P-type organic material absorbing green light and P-type organic material absorbing blue light through co-deposition. The N-type organic material layer 360 may be formed by co-depositing an N-type organic material absorbing green light and an N-type organic material absorbing blue light.

In the green color unit 300G, the P-type organic material layer 340 and the N-type organic material layer 360 are formed of a light absorbing organic material that transmits green light and absorbs light in a wavelength band other than the green wavelength band. do. For example, the P-type organic material layer 340 and the N-type organic material layer 360 of the green color unit 300G may be formed of a material that absorbs red light and blue light to cause photoelectric conversion. In this case, similar to the red color unit 300R described above, the P-type organic material layer 340 and the N-type organic material layer 360 of the green color unit 300G are organic materials absorbing red light and blue light, respectively. Or these materials may be formed by co-deposition.

In the case of the blue color unit 300G, the P-type organic material layer 340 and the N-type organic material layer 360 are formed of a light absorbing organic material that transmits blue light and absorbs light in a wavelength band other than the blue wavelength band. do. For example, the P-type organic material layer 340 and the N-type organic material layer 360 of the blue color unit 300B may be formed of a material that absorbs red light and green light to cause photoelectric conversion. In this case, similar to the red color unit 300R described above, the P-type organic material layer 340 and the N-type organic material layer 360 of the blue color unit 300B are organic materials absorbing red light and green light, respectively. Or these materials may be formed by co-deposition.

As a specific example, the P-type organic material absorbing blue light may be selected from oligothiophene derivatives. Phenyl hexa thiophene (P6T) of the following formula (1) of the oligothiophene derivatives has a bandgap energy of about 2.1 eV and may selectively absorb a blue light wavelength band of 400 to 500 nm. Therefore, P6T may be used as a material of the P-type organic material layer 340 of the red color unit 300R or the green color unit 300G.

(1)

(One)

In addition, bi-phenyl-tri-thiophene (BP3T) of the following formula (2) among the oligothiophene derivatives can effectively absorb blue light in the range of 400 to 550 nm and light in some green wavelength bands. Can be. Therefore, BP3T may be used as a material of the P-type organic material layer 340 of the red color unit 300R.

(2)

(2)

The N-type organic material layer 360 may be formed of a semiconductor organic material in which electrons are a plurality of carriers. Examples of the material that may be used in the N-type organic material layer 360 may include C ₆₀ Fullerene Carbon. .

Referring to FIG. 3, the organic photoelectric conversion film 330 'of the red, green, and blue color units 300R', 300G ', and 300B' of another example has a PIN junction structure, and thus, a P-type organic material layer ( 340, an intrinsic layer 350, and an N-type organic material layer 360.

The P-type organic material layer 340 is formed on the first electrode 310, the intrinsic layer 350 is formed on the P-type organic material layer 340, and the N-type organic material layer 360 is int. It is formed on the lean layer 350. As described above with reference to FIG. 2, the P-type organic material layer 340 and the N-type organic material layer 360 selectively pass light of a wavelength band other than the wavelength band of the transmitted light through only light of a desired color. The photoresist may be formed of different organic materials for each of the red, green, and blue color units 300R ', 300G', and 300B '.

The intrinsic layer 350 may be formed by co-deposition of a P-type organic material and an N-type organic material. The P-type organic material constituting the intrinsic layer 350 may or may not be the same material as the material constituting the P-type organic material layer 340. The N-type organic material constituting the intrinsic layer 350 may be N-type. The material of the organic material layer 360 may or may not be the same material. For example, the intrin layer 350 may be formed by co-depositing CuPc (copper phthalocyanine), which is a P-type organic material, and C ₆₀ (fullerene), an N-type organic material, but is not limited thereto.

Referring to FIG. 4, the organic photoelectric conversion film 330 ″ of the red, green, and blue color units 300R ″, 300G ″, and 300B ″ of another example may have a P-type organic material layer 340 having a PIN junction structure. , An intrinsic layer 350 and an N-type organic material layer 360, and a P-type buffer layer 320 is formed between the first electrode 310 and the P-type organic material layer 340. An N-type buffer layer 380 is formed between the second electrode 390 and the N-type organic material layer 360.

The buffer layers 320 and 380 may be used to transport charges more easily, and may be formed of a charge transport material (for example, an aryl compound) commonly used in an organic light emitting diode (OLED).

For example, the P-type buffer layer 320 may be polyethylene dioxythiophene / polystyrene sulfonic acid (PEDOT / PSS), but is not limited thereto. In addition, the N-type buffer layer 380 is BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline), LiF, copper phthalocyanine, polythiophene, polyaniline , Polyacetylene, polypyrrole, polyphenylenevinylene, or derivatives thereof, and the like, but are not limited thereto.

The organic photoelectric conversion layers 330, 330 ′, and 330 ″ shown in FIGS. 2 to 3 all have a single layer structure having one PN junction or a PIN junction, but are not limited thereto. 5 illustrates an example in which PN bonding layers are vertically stacked.

Referring to FIG. 5, another example of the red, green, and blue color units 400R, 400G, and 400B includes a first and a second organic photoelectric conversion film between the first electrode 410 and the second electrode 490. 430 and 470 are interposed. A conductive layer 450 formed of a conductive material such as Ag may be interposed between the first and second organic photoelectric conversion films 430 and 470 to improve bonding and conductivity. The first and second organic photoelectric conversion films 430 and 470 include P-type organic material layers 433 and 473 and N-type organic material layers 435 and 475 respectively bonded to PN. In some cases, an intrinsic layer or a buffer layer may be used. May be interposed.

The red, green, and blue color units 400R, 400G, and 400B form the P-type organic material layers 433 and 473 and the N-type organic material layers 435 and 475 in multiple layers, thereby making the wavelength band of light to be absorbed more flexible. Can be extended.

For example, in the case of the red color unit 400R, the green light and the blue light may be absorbed, and thus the P-type organic material layer 433 and the N-type organic material layer 435 of the first organic photoelectric conversion film 430 may be formed. The silver may be formed of an organic material absorbing green light, and the P-type organic material layer 473 and the N-type organic material layer 475 of the second organic photoelectric conversion film 470 may be formed of an organic material absorbing blue light. .

For example, in the red color unit 400R, the P-type organic material layer 433 and the N-type organic material layer 435 of the first organic photoelectric conversion film 430 are made of T-type organic material layer. (433) and NTCDA can be used as green absorption bands. In addition, as the P-type organic material layer 473 and the N-type organic material layer 475 of the second organic photoelectric conversion film 470, blue light may be used as an absorption band using TPD and C ₆₀ , respectively. At this time, the first organic photoelectric conversion film 430 is formed by co-depositing TPD and Me-PTC between the P-type organic material layer 433 made of TPD and the N-type organic material layer 435 made of NTCDA. It is possible to further improve the photoelectric conversion efficiency through the interlining layer.

6 to 8 schematically show various examples of the arrangement structure of the red, green, and blue color units 300R, 300G, and 300B in the color filter 300 of FIG. 1.

First, FIG. 6 illustrates a stripe arrangement in which red, green, and blue color units 300R, 300G, and 300B are arranged in line. FIG. 7 illustrates a mosaic arrangement in which a plurality of red color units 300R, green color units 300G, and blue color units 300B are arranged adjacent to color units of different colors. 8, a plurality of red color units 300R and green color units (300R), green color units 300G, and a plurality of red color units 300R and green color units 300 are formed so that the shape connecting the centers of the blue color units 300B and the blue color units 300B becomes a delta. 300G) and a delta arrangement with a blue color unit 300B is shown.

As such, the arrangement of the various red, green, and blue color units 300R, 300G, and 300B includes a deposition process of the organic photoelectric change film (330 of FIG. 1) of the red, green, and blue color units 300R, 300G, and 300B. By patterning using a sea photolithography process or the like, it can be easily achieved.

Hereinafter, an operation of the display apparatus according to an embodiment of the present invention will be described.

Referring back to FIG. 1, when the white light L _W is illuminated from the backlight unit 100 to the rear surface of the image panel 200, the backlight unit 100 passes through the polarizer 210 and has a predetermined polarization. In this case, the liquid crystal alignment of the liquid crystal layer 250 may be changed according to whether the voltage of the driving electrode 230 is applied, and polarization of light passing through the birefringence characteristic of the liquid crystal may be changed.

Therefore, the light passing through the liquid crystal layer 250 passes through the color filter 300, and the red light (L _R ), the green light (L _G ), and the blue light for each of the red, green, and blue color units 300R, 300G, and 300B. Will have (L _B ).

On the other hand, light of the wavelength band other than the red light L _R among the light passing through the red color unit 300R is absorbed by the organic photoelectric conversion film 330 of the red color unit 300R and photoelectrically converted. The photoelectrically converted current generates photovoltaic power at the first and second electrodes 310 and 390, and the current can flow to the outside along the wiring not shown. Similarly, except for the green light (L _G) of the light passing through the green color unit (300G), the light of the other wavelength band is absorbed in the organic photoelectric conversion film 330 of the green color unit (300G) is photoelectrically converted, and blue color units Among the light passing through the 300B, light of the remaining wavelength band except for the blue light L _B is absorbed by the organic photoelectric conversion film 330 of the blue color unit 300B and photoelectrically converted, thereby externally along the wiring (not shown). Current flows.

On the other hand, since the red light (L _R ), green light (L _G ), and blue light (L _B ) passing through the color filter 300 has different polarization for each pixel, it passes through or is blocked by the polarizing plate 280 according to the polarization direction The color for each pixel is expressed.

As described above, the display device according to the present exemplary embodiment may convert light having a wavelength absorbed by the color filter into electrical energy through the organic photoelectric conversion film 330 when displaying an image. Therefore, since it can be used as an auxiliary power source of the display device, power consumption of the display device can be reduced, and restrictions on the use place or time of the display device can be relaxed.

In addition, even when the display device is turned off and not operating, if external light is present, external light may be incident on the color filter 300 via the polarizer 280 and the second transparent substrate 270. Therefore, it is possible to convert external light into electrical energy.

Therefore, by using external light, the display device of the present embodiment can supply energy required for the standby operation of the display device.

9 is a schematic view of a display device according to another embodiment of the present invention.

Referring to FIG. 9, the display device of this embodiment is a liquid crystal display device including an image panel 500 and a color filter 300 for imparting color to an image formed in the image panel 200. As shown in FIG. The color filter 300 has been described above with reference to FIGS. 2 to 5.

The image panel 500 includes a liquid crystal layer 550 between the first and second transparent substrates 520 and 580, the first and second transparent substrates 520 and 580, and a first polarizing plate provided outside the first transparent substrate 520. 510, a second polarizing plate 580 provided outside the second transparent substrate 280, and a reflecting plate 510. The liquid crystal layer 550 is aligned in a constant direction by an alignment film (not shown). A driving electrode 530 is formed on the inner side of one of the first and second transparent substrates 520 and 580 to control the liquid crystal layer 550 in pixel units, and a common electrode is formed on the inner side of the other substrate. Is formed. As described above, the first electrode 310 of the color filter 300 may function as a common electrode of the image panel 500.

This embodiment is different from the display according to FIG. 1 in that external light is used as the image panel 500. When the external white light L _W is illuminated, the display device of the present exemplary embodiment is reflected and re-emitted according to the polarization state of the first and second polarizing plates 520 and 580 and the liquid crystal layer 550 to display an image. At this time, while passing through the color filter 300, and absorbs the light of the remaining wavelength band except the color transmitted from the organic photoelectric conversion film 330 of the color filter 300 can be utilized because it generates electrical energy.

The reflector 510 reflects light back through the liquid crystal layer 550 back to the front surface. If a separate backlight light source is provided on the reflecting plate 510 side, it is also possible to transform it into a reflection unit and an integrated unit that can be displayed as a backlight light source in the dark. The reflective plate 510 may be disposed inside the first transparent substrate 530.

Arrangement of the color filter according to the embodiments described above may be the same as the arrangement of the conventional color filter. Therefore, the color filter shown in the above-described embodiments may be applied to various conventional display devices employing the color filter. For example, the color filter shown in the above-described embodiments may be applied to a polymer dispersed liquid crystal display (PDLCD), an organic light emitting display device that emits light, and an E-ink.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

1 is a cross-sectional view showing a schematic structure of a display device according to an embodiment of the present invention;

2 is a cross-sectional view illustrating a schematic structure of an example of a color filter of the display device of FIG. 1;

3 is a cross-sectional view showing a schematic structure of another example of a color filter of the display device of FIG. 1;

4 is a cross-sectional view showing a schematic structure of another example of a color filter of the display device of FIG. 1;

5 is a cross-sectional view showing a schematic structure of another example of a color filter of the display device of FIG. 1;

6 to 8 are schematic views showing various examples of the arrangement structure of the color units of the color filter of the display device of FIG. 1;

9 is a cross-sectional view showing a schematic structure of a display device according to another embodiment of the present invention.

DESCRIPTION OF THE RELATED ART [0002]

100: backlight unit 200, 500: image panel

220, 270, 530, 570: transparent substrates 250, 550: liquid crystal layer

234 and 540: driving electrode 300: color filter

300R, 300G, 300B, 400R, 400G, 400B: Color Unit

310, 390, 410, 490: electrode 320, 380: buffer layer

330, 330 ', 330 ″, 430, 470: organic photoelectric conversion film

340, 360, 433, 435, 473, 475: organic material layer

350: intrin layer 399: black mask

450: conductive layer 510: reflector

Claims (22)

An image panel on which an image is displayed by an image signal; And And a color filter that transmits light of a predetermined color to impart color to the image. The color filter may include an organic photoelectric conversion film formed between the first electrode and the second electrode spaced apart from each other, and the first and second electrodes, wherein the organic photoelectric conversion film corresponds to a plurality of pixels of the image panel. A display device including a color unit, and selectively absorbs light in a wavelength band other than the wavelength band of light transmitted for each color unit. The display device of claim 1, wherein the organic photoelectric conversion layer comprises a P-type organic material layer formed on the first electrode and an N-type organic material layer formed on the P-type organic material layer. The display device of claim 2, wherein each of the P-type organic material layer and the N-type organic material layer is formed of an organic material that absorbs light in at least one band among red, green, and blue to cause photoelectric conversion. The display device of claim 2, further comprising an intrin layer formed between the P-type organic material layer and the N-type organic material layer, and formed by co-depositing the P-type organic material and the N-type organic material. The display apparatus of claim 4, further comprising a buffer layer interposed between at least one of the first electrode and the P-type organic material layer or between the second electrode and the N-type organic material layer. The display device of claim 2, wherein the organic photoelectric conversion layer further includes an organic material layer having another PN junction structure stacked on the N-type organic material layer. The display apparatus of claim 1, wherein the plurality of color units comprises a red unit, a green unit, and a blue unit. The display apparatus of claim 7, wherein the red unit transmits red light and absorbs green light and blue light to photoelectric convert. The display apparatus of claim 8, wherein the red unit is formed by stacking a green photoelectric conversion layer absorbing green light and a blue photoelectric conversion layer absorbing blue light. The display device of claim 9, wherein a conductive layer is formed between the green photoelectric conversion layer and the blue photoelectric conversion layer. The display apparatus of claim 8, wherein the red unit is formed of a single layer of a cyan photoelectric conversion layer that absorbs green light and blue light. The display device according to claim 7, wherein the green unit transmits green light and absorbs red and blue light to photoelectric convert. The display apparatus of claim 12, wherein the green unit is formed of a double layer of a red photoelectric conversion layer absorbing red light and a blue photoelectric conversion layer absorbing blue light. The display device of claim 13, wherein a conductive layer is formed between the red photoelectric conversion layer and the blue photoelectric conversion layer. The display apparatus of claim 12, wherein the green unit is formed of a single layer of a red-blue photoelectric conversion layer that absorbs red light and blue light. The display device according to claim 7, wherein the blue unit transmits blue light and absorbs red and green light to photoelectric convert. The display apparatus of claim 16, wherein the blue unit is formed of a double layer of a red photoelectric conversion layer absorbing red light and a green photoelectric conversion layer absorbing green light. The display device of claim 17, wherein a conductive layer is formed between the red photoelectric conversion layer and the green photoelectric conversion layer. The display apparatus of claim 16, wherein the blue unit is formed of a single layer of a red-green photoelectric conversion layer that absorbs red light and green light. The display apparatus of claim 1, wherein the first electrode and the second electrode are formed of a transparent conductive material, and the work function of the first electrode has a larger value than the work function of the second electrode. The display apparatus according to any one of claims 1 to 20, wherein the image panel is a liquid crystal panel, a PDLCD panel, an OLED panel, or an E-ink panel. The display apparatus of claim 21, wherein the color filter is positioned above or below the image panel.

Images