KR20180061843A - Organic light emitting display device - Google Patents

Abstract

The present invention relates to an organic light emitting display device in which a distance between an organic light emitting element and black matrix is reduced to prevent occurrence of color mixture and increase a luminance viewing angle. According to one embodiment of the present invention, the organic light emitting display device comprises: first electrodes disposed on a first substrate; an organic light emitting layer disposed on the first electrodes; a second electrode disposed on the organic light emitting layer; a first encapsulant film covering the second electrode; black matrix disposed on the first encapsulant film; and a second encapsulant film covering the first encapsulant film and the black matrix.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-

The present invention relates to an organic light emitting display.

As the information society develops, there is a growing demand for display devices for displaying images. In recent years, various display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting display (OLED) have been used.

Of the display devices, the organic light emitting display device is a self-emitting type, and has a better viewing angle and contrast ratio than a liquid crystal display device (LCD), does not require a separate backlight and is lightweight and thin, . In addition, the organic light emitting display device is capable of being driven by a DC low voltage, has a high response speed, and is particularly advantageous in manufacturing cost.

The organic light emitting display includes pixels each including an organic light emitting element, and a bank for partitioning pixels to define pixels. The bank can serve as a pixel defining layer. The organic light emitting device includes an anode electrode, a hole transporting layer, an organic light emitting layer, an electron transporting layer, and a cathode electrode. In this case, when a high potential voltage is applied to the anode electrode and a low potential voltage is applied to the cathode electrode, holes and electrons move to the organic light emitting layer through the hole transporting layer and the electron transporting layer, respectively.

When the organic light emitting device emits white light, a red, green, and blue color filters for realizing red, green, and blue and a black matrix for partitioning color filters are required. The organic light emitting device is formed on a lower substrate of the organic light emitting display, and the color filters and the black matrix are formed on an upper substrate of the organic light emitting display.

FIGS. 1A and 1B are illustrations showing the color mixture occurrence and the luminance viewing angle depending on the distance between the organic light emitting device and the black matrix.

FIG. 1A shows the color mixture and the luminance viewing angle due to the organic light emitting device EL when the distance between the organic light emitting layer OL and the black matrix BM of the organic light emitting device EL is "a". FIG. When a distance between the organic light emitting layer OL and the black matrix BM of the organic light emitting element EL is "b ", color mixture due to the organic light emitting element EL and the luminance viewing angle are shown. Distance "a" is longer than distance "b". The organic light emitting device EL includes an anode electrode (AND), an organic light emitting layer (OL), and a cathode electrode (CAT).

1A and 1B, when the distance between the organic light emitting layer OL and the black matrix BM of the organic light emitting element EL is "a ", light emitted from the organic light emitting element EL of any one pixel Color mixing may occur in which the light is not blocked by the black matrix BM but proceeds to the color filter CF of the adjacent pixel. However, when the distance between the organic light emitting layer OL and the black matrix BM of the organic light emitting element EL is "b ", color mixture may hardly occur.

When the distance between the organic light emitting layer OL and the black matrix BM of the organic light emitting element EL is "a ", the light emitted from the organic light emitting element EL is emitted at the first angle & When the distance between the organic light emitting layer OL and the black matrix BM of the organic light emitting element EL is "b ", the light emitted from the organic light emitting element EL is greater than the first angle & And is output at two angles? 2.

As described above, it is necessary to reduce the distance between the organic light emitting layer OL and the black matrix BM of the organic light emitting device EL in order to prevent the occurrence of color mixture and increase the luminance viewing angle.

The present invention provides an organic light emitting display device capable of preventing color mixing and increasing a luminance viewing angle by reducing a distance between an organic light emitting layer and a black matrix.

An organic light emitting display according to an embodiment of the present invention includes first electrodes disposed on a first substrate, an organic light emitting layer disposed on the first electrodes, a second electrode disposed on the organic light emitting layer, A black matrix disposed on the first sealing film, and a second sealing film covering the first sealing film and the black matrix.

An organic light emitting display according to another embodiment of the present invention includes first electrodes disposed on a first substrate, an organic light emitting layer disposed on the first electrodes, a second electrode disposed on the organic light emitting layer, A color filter disposed on the sealing film, a black matrix overlapping the boundary of the color filters, and a reflection reducing layer covering the color filters and containing the same material as the black matrix.

In an embodiment of the present invention, a black matrix is disposed between the first sealing film and the second sealing film. As a result, the embodiment of the present invention can reduce the distance between the organic light emitting device and the black matrix compared to when the black matrix and the color filters are formed on the second substrate. Therefore, the embodiment of the present invention can prevent the occurrence of color mixture and increase the luminance viewing angle.

Further, the embodiment of the present invention forms a reflection reducing layer with the same material as the black matrix on the first to third color filters. As a result, since the embodiment of the present invention can reduce the reflection of light incident from the outside using the reflection reducing layer, the polarizing plate can be eliminated. Therefore, the embodiment of the present invention can reduce the manufacturing cost due to the polarizing plate.

FIGS. 1A and 1B are illustrations showing the occurrence of a color mixture and a luminance viewing angle depending on the distance between the organic light emitting device and the color filter.
2 is a perspective view illustrating an OLED display according to an embodiment of the present invention.
FIG. 3 is a plan view showing the first substrate, the gate driver, the source drive IC, the flexible film, the circuit board, and the timing controller of FIG. 2;
4 is a plan view showing an example of pixels in the display area.
5 is a cross-sectional view showing an example of I-I 'of FIG.
6 is a table showing the average reflectance of the display panel according to the transmittance of the reflection reducing layer.
7 is a cross-sectional view showing another example of I-I 'of FIG.

Like reference numerals throughout the specification denote substantially identical components. In the following description, detailed descriptions of configurations and functions known in the technical field of the present invention and those not related to the core configuration of the present invention can be omitted. The meaning of the terms described herein should be understood as follows.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. To fully disclose the scope of the invention to a person skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Where the terms "comprises," "having," "consisting of," and the like are used in this specification, other portions may be added as long as "only" is not used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

The terms "X-axis direction "," Y-axis direction ", and "Z-axis direction" should not be construed solely by the geometric relationship in which the relationship between them is vertical, It may mean having directionality.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, May refer to any combination of items that may be presented from more than one.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view illustrating an OLED display according to an embodiment of the present invention. FIG. 3 is a plan view showing the first substrate, the gate driver, the source drive IC, the flexible film, the circuit board, and the timing controller of FIG. 2;

2 and 3, a display device 100 according to an embodiment of the present invention includes a display panel 110, a gate driver 120, a source driver integrated circuit (IC) A flexible film 140, a circuit board 150, and a timing controller 160. The flexible film 140 may be a flexible printed circuit board.

The display panel 110 includes a first substrate 111 and a second substrate 112. The second substrate 112 may be an encapsulating substrate. The first substrate 111 may be a plastic film or a glass substrate. The second substrate 112 may be a plastic film, a glass substrate, or a sealing film (protective film).

On one side of the first substrate 111 facing the second substrate 112, gate lines, data lines, and pixels are formed. The pixels are provided in an area defined by the intersection structure of the gate lines and the data lines.

Each of the pixels may include a thin film transistor and an organic light emitting element having a first electrode, an organic light emitting layer, and a second electrode. Each of the pixels supplies a predetermined current to the organic light emitting element in accordance with the data voltage of the data line when the gate signal is inputted from the gate line by using the thin film transistor. Thus, the organic light emitting element of each of the pixels can emit light with a predetermined brightness according to a predetermined current. A description of the structure of each of the pixels will be given later with reference to FIG.

The display panel 110 may be divided into a display area DA for displaying an image and a non-display area NDA for displaying an image, in which pixels are formed as shown in FIG. Gate lines, data lines, and pixels may be formed in the display area DA. A gate driver 120 and pads may be formed in the non-display area NDA.

The gate driver 120 supplies the gate signals to the gate lines according to the gate control signal input from the timing controller 160. The gate driver 120 may be formed in a non-display area DA on one side or both sides of the display area DA of the display panel 110 in a gate driver in panel (GIP) manner. Alternatively, the gate driver 120 may be formed of a driving chip and mounted on a flexible film, and may be formed in a non-display area DA on one side or both sides of the display area DA of the display panel 110 by TAB (tape automated bonding) As shown in FIG.

The source driver IC 130 receives the digital video data and the source control signal from the timing controller 160. The source driver IC 130 converts the digital video data into analog data voltages according to the source control signal and supplies the analog data voltages to the data lines. When the source drive IC 130 is fabricated from a driving chip, the source drive IC 130 may be mounted on the flexible film 140 using a chip on film (COF) method or a chip on plastic (COP) method.

Pads such as data pads may be formed in the non-display area NDA of the display panel 110. [ Wires connecting the pads and the source drive IC 130 and wirings connecting the pads and the wirings of the circuit board 150 may be formed in the flexible film 140. The flexible film 140 is adhered to the pads using an anisotropic conducting film, whereby the pads and the wirings of the flexible film 140 can be connected.

The circuit board 150 may be attached to the flexible films 140. The circuit board 150 may be implemented with a plurality of circuits implemented with driving chips. For example, the timing control unit 160 may be mounted on the circuit board 150. [ The circuit board 150 may be a printed circuit board or a flexible printed circuit board.

The timing controller 160 receives digital video data and a timing signal from an external system board through a cable of the circuit board 150. [ The timing controller 60 generates a gate control signal for controlling the operation timing of the gate driver 120 and a source control signal for controlling the source driver ICs 130 based on the timing signal. The timing controller 160 supplies a gate control signal to the gate driver 120 and a source control signal to the source driver ICs 130. [

4 is a plan view showing an example of pixels in the display area. Only the pixels RP, GP, BP, and WP, the bank BANK, and the black matrix BM are shown in FIG.

Referring to FIG. 4, each of the pixels RP, GP, BP and WP includes a first electrode corresponding to the anode electrode, an organic light emitting layer, and a second electrode corresponding to the cathode electrode, And the holes and the electrons from the second electrode are combined with each other in the organic light emitting layer to emit light.

The organic light emitting layer of each of the pixels RP, GP, BP, and WP may be formed as a common layer to emit white light to the pixels RP, GP, BP, and WP. In this case, the red color filter may be disposed corresponding to the red pixel RP, the green color filter may be disposed to correspond to the green pixel GP, and the blue color filter may be disposed corresponding to the blue pixel BP. The color filter may not be disposed in the white pixel WP. In this case, a transparent organic film may be disposed in the white pixel WP instead of the color filter. The red pixel RP emits red light by the red color filter, the green pixel GP emits green light by the green color filter, and the blue pixel BP emits blue light by the blue color filter . Further, a white color filter having a predetermined transmission wavelength range may be disposed in the white pixel WP. The color coordinate correction can be performed due to the white color filter and the reflection of the external light in the white pixel WP can be reduced. A transparent organic film may be disposed instead of the white color filter, or the white color filter may be omitted.

The red pixel RP, the green pixel GP, the blue pixel BP, and the white pixel WP may be defined as one unit pixel. However, the embodiment of the present invention is not limited to this, and white pixels may be omitted. In this case, the red pixel, the green pixel, and the blue pixel may be defined as one unit pixel.

The bank BANK serves as a pixel defining layer for defining the pixels RP, GP, BP, and WP by dividing the pixels RP, GP, BP, and WP.

The black matrix BM is disposed so as to overlap with the bank BANK in order to prevent the light of one pixel from proceeding to adjacent pixels and causing color mixing. The black matrix (BM) serves to partition the color filters. In addition, when a transparent organic film is disposed instead of the color filter in the white pixel WP, the black matrix BM serves to partition the color filters and the transparent organic film.

5 is a cross-sectional view showing an example of I-I 'of FIG.

Referring to FIG. 5, a buffer layer is formed on one surface of the first substrate 111 facing the second substrate 112. The buffer layer is formed on one surface of the first substrate 111 to protect the thin film transistors 210 and the organic light emitting devices 260 from moisture penetrating through the first substrate 111 which is susceptible to moisture permeation. The buffer film may be composed of a plurality of stacked inorganic films. For example, the buffer film may be formed of multiple films in which one or more inorganic films of a silicon oxide film (SiO _x ), a silicon nitride film (SiN _x ), and SiON are alternately stacked. The buffer film may be omitted.

A thin film transistor 210 is formed on the buffer film. The thin film transistor 210 includes an active layer 211, a gate electrode 212, a source electrode 213 and a drain electrode 214. 5 illustrates that the TFT 210 is formed in a top gate structure in which the gate electrode 212 is located on the active layer 211. However, the present invention is not limited thereto. That is, the thin film transistors 210 may be formed by a bottom gate method in which the gate electrode 212 is located under the active layer 211 or a bottom gate method in which the gate electrode 212 is formed on the upper and lower portions of the active layer 211, And may be formed in a double gate manner.

An active layer 211 is formed on the buffer film. The active layer 211 may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. A light shielding layer for shielding external light incident on the active layer 211 may be formed between the buffer layer and the active layer 211. [

A gate insulating layer 220 may be formed on the active layer 211. The gate insulating film 220 may be formed of an inorganic film, for example, a silicon oxide film (SiO _x ), a silicon nitride film (SiN _x ), or a multilayer film thereof.

A gate electrode 212 and a gate line may be formed on the gate insulating layer 220. The gate electrode 212 and the gate line may be formed of any one of Mo, Al, Cr, Au, Ti, Ni, Ne, Or a single layer or multiple layers of one or more of these alloys.

An interlayer insulating film 230 may be formed on the gate electrode 212 and the gate line. The interlayer insulating film 230 may be formed of an inorganic film, for example, a silicon oxide film (SiO _x ), a silicon nitride film (SiN _x ), or a multilayer film thereof.

A source electrode 213, a drain electrode 214, and a data line may be formed on the interlayer insulating film 230. Each of the source electrode 213 and the drain electrode 214 may be connected to the active layer 211 through a contact hole passing through the gate insulating film 220 and the interlayer insulating film 230. The source electrode 213, the drain electrode 214 and the data line may be formed of a metal such as molybdenum (Mo), aluminum (Al), chrome (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium And copper (Cu), or an alloy thereof.

A protective film 240 for insulating the thin film transistor 210 may be formed on the source electrode 223, the drain electrode 224, and the data line. The protective film 240 may be formed of an inorganic film, for example, a silicon oxide film (SiO _x ), a silicon nitride film (SiN _x ), or a multilayer thereof.

The planarization layer 250 may be formed on the passivation layer 240 to flatten a step due to the thin film transistor 210. The planarization layer 250 may be formed of an organic layer such as an acryl resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin. have.

The organic light emitting diode 260 and the bank 270 are formed on the planarization layer 250. The organic light emitting device 260 includes a first electrode 261, an organic light emitting layer 262, and a second electrode 263. The first electrode 261 may be an anode electrode, and the second electrode 263 may be a cathode electrode.

The first electrode 261 may be formed on the planarization layer 250. The first electrode 261 is connected to the source electrode 223 of the thin film transistor 210 through the contact hole passing through the protective film 240 and the planarization film 250. The first electrode 261 is formed of a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an APC alloy, / ITO). ≪ / RTI > The APC alloy is an alloy of silver (Ag), palladium (Pd), and copper (Cu).

The bank 270 may be formed to cover the edge of the first electrode 261 on the planarization film 250 to partition the pixels RP, GP, BP, WP. That is, the bank 270 serves as a pixel defining layer for defining the pixels RP, GP, BP, and WP.

Each of the pixels RP, GP, BP, and WP includes a first electrode corresponding to the anode electrode, an organic light emitting layer, and a second electrode corresponding to the cathode electrode sequentially stacked, and the holes from the first electrode and the second electrode In which the electrons in the organic light-emitting layer are combined with each other to emit light. In this case, the region where the bank 270 is formed can be defined as a non-light emitting portion since it does not emit light.

The bank 270 may be formed of an organic film such as an acryl resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin .

An organic light emitting layer 262 is formed on the first electrode 261 and the bank 270. The organic light emitting layer 262 is a common layer formed commonly to the pixels RP, GP, BP, and WP, and may be a white light emitting layer that emits white light. In this case, the organic light emitting layer 262 may be formed in a tandem structure of two stacks or more. Each of the stacks may include a hole transporting layer, at least one light emitting layer, and an electron transporting layer.

Also, a charge generating layer may be formed between the stacks. The charge generation layer may include an n-type charge generation layer located adjacent to the bottom stack and a p-type charge generation layer formed on the n-type charge generation layer and located adjacent to the top stack. The n-type charge generation layer injects electrons into the lower stack, and the p-type charge generation layer injects holes into the upper stack. The n-type charge generation layer may be an organic layer doped with an alkali metal such as Li, Na, K, or Cs, or an alkaline earth metal such as Mg, Sr, Ba, or Ra to an organic host material having electron transporting ability. The p-type charge generating layer may be an organic layer doped with an organic host material capable of hole transporting.

The second electrode 263 is formed on the organic light emitting layer 262. The second electrode 263 is a common layer formed commonly to the pixels RP, GP, BP, and WP. The second electrode 263 may be formed of a transparent conductive material such as ITO or IZO or a transparent conductive material such as magnesium (Mg), silver (Ag), or magnesium (Mg) (Semi-transmissive Conductive Material). When the second electrode 140 is formed of a semitransparent metal material, the efficiency of outgoing light can be increased by a micro cavity. A capping layer may be formed on the second electrode 263.

The first sealing film 280 is disposed on the second electrode 263. The first sealing film 280 may be formed to cover the second electrode 263. The first sealing film 280 serves to prevent penetration of oxygen or moisture into the organic light emitting layer 262 and the second electrode 263. For this, the first sealing film 280 may include at least one inorganic film. The at least one inorganic film may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide.

A black matrix 320 is disposed on the first sealing film 280. The black matrix 320 may be disposed so as to overlap with the bank 270. That is, the black matrix 320 may be disposed so as not to overlap with the pixels RP, GP, BP, WP. The black matrix 320 may be formed of an organic film or an inorganic film. The black matrix 320 may include a carbon black pigment when formed of an organic film. When the black matrix 320 is formed of an inorganic film, the black matrix 320 may include an opaque metal material such as chromium (Cr) having a high light absorptivity.

A second sealing film 290 is disposed on the first sealing film 280 and the black matrix 320. The second sealing film 290 may be formed to cover the first sealing film 280 and the black matrix 320. The second sealing film 290 prevents oxygen or moisture from penetrating the organic light emitting layer 262 and the second electrode 263. To this end, the second sealing film 290 may include at least one inorganic film. The at least one inorganic film may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide.

The first to third color filters 311, 312, and 313 and the transparent organic film 314 are disposed on the second sealing film 290. The first to third color filters 311, 312 and 313 and the transparent organic layer 314 may be formed to fill the step due to the bank 270 and the black matrix 320 as shown in FIG. In this case, the embodiment of the present invention may omit the overcoat layer for planarizing the bank 270 and the step due to the black matrix 320. When the first to third color filters 311, 312 and 313 are directly formed on the second sealing film 290, the first substrate 111 and the second substrate 112 are aligned And the thickness of the display panel can be reduced since no separate adhesive layer is required.

The first color filter 311 is a red color filter arranged corresponding to the red pixel RP and the second color filter 312 is a green color filter arranged corresponding to the green pixel GP, (313) may be a blue color filter arranged corresponding to the blue pixel (BP). The transparent organic film 314 may be disposed corresponding to the white pixel WP. In this case, the first color filter 311 is formed of an organic film containing a red pigment, the second color filter 312 is formed of an organic film containing a green pigment, and the third color filter 313 is formed of a blue And may be formed of an organic film containing a pigment. The transparent organic layer 314 may be formed of an acryl resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

The black matrix 320 may be disposed so as to overlap with the boundary of the color filters 311, 312, and 313 in order to prevent the light of one pixel from proceeding to the color filters of the adjacent pixels to cause color mixing.

A reflection reducing layer 330 is disposed on the first to third color filters 311, 312, and 313 and the transparent organic layer 314. The reflection reducing layer 330 blocks part of the light to reduce the light incident from the outside by the first electrode 261 and the second electrode 262 (hereinafter referred to as "external light reflection"). For this purpose, the reflection reducing layer 330 may be formed of an organic film containing a carbon black pigment. That is, the reflection reducing layer 330 may be formed of the same material as the black matrix 320.

FIG. 6 is a table showing the average reflectance of the display panel according to the transmittance of the reflection reducing layer 330. Referring to FIG. 6, the higher the transmittance of the reflection reducing layer 330, the lower the average reflectance of the display panel. The transmittance of the reflection reducing layer 330 is inversely proportional to the thickness of the reflection reducing layer 330. That is, as the thickness of the reflection reducing layer 330 is increased, the transmittance of the reflection reducing layer 330 may be lowered. Accordingly, the transmittance of the reflection reducing layer 330 can be controlled by adjusting the thickness of the reflection reducing layer 330.

When the reflection reducing layer 330 is not formed, the average reflectance of the display panel is 14.0%. When the transmittance of the reflection reducing layer 330 is 70%, the average reflectance of the display panel is reduced to 9.1%. When the transmittance of the reflection reducing layer 330 is 60%, the average reflectance of the display panel is reduced to 7.8%. When the transmittance of the reflection reducing layer 330 is 50%, the average reflectance of the display panel is reduced to 6.8%.

The lower the transmittance of the reflection reducing layer 330, the lower the average reflectance of the display panel. However, when the transmittance of the reflection reducing layer 330 is lowered, the efficiency of outgoing light of the organic light emitting element 260 is lowered. Therefore, the transmittance of the reflection reducing layer 330 can be determined in advance through a preliminary experiment before commercialization, in consideration of the average reflectance of the display panel as well as the light emitting efficiency of the organic light emitting element 260.

Since the transmittance of the black matrix 320 is 1% or less, the thickness D1 of the black matrix 320 may be thicker than the thickness D2 of the reflection reducing layer 330.

In order to prevent light from the outside from being reflected by the first electrode 261 and the second electrode 262 in the related art, a polarizer is attached on the upper substrate 112. However, . Embodiments of the present invention can eliminate the polarizing plate by using the reflection reducing layer 330, thereby reducing manufacturing cost due to the polarizing plate.

A second substrate 112 is disposed on the reflection reducing layer 330. The second substrate 112 may be a plastic film, a glass substrate, or a sealing film (protective film).

As described above, in the embodiment of the present invention, the black matrix 320 is disposed between the first sealing film 280 and the second sealing film 290. As a result, compared to the case where the color filters 311, 312 and 313 and the black matrix 320 are formed on the second substrate 112, Can be reduced. Therefore, the embodiment of the present invention can prevent the occurrence of color mixture and increase the luminance viewing angle.

7 is a cross-sectional view showing another example of I-I 'of FIG.

The embodiment of Fig. 7 is substantially the same as that described with reference to Fig. 5 except for the second sealing film 290, the color filters 311, 312, and 313, and the transparent organic film 314. 7, detailed descriptions of the remaining components except for the second sealing film 290, the color filters 311, 312, and 313, and the transparent organic film 314 will be omitted.

Referring to FIG. 7, the second sealing film 280 and the second sealing film 290 are disposed on the black matrix 320. The second sealing film 290 may be formed to cover the first sealing film 280 and the black matrix 320. The second sealing film 290 prevents oxygen or moisture from penetrating the organic light emitting layer 262 and the second electrode 263. To this end, the second sealing film 290 may include at least one inorganic film and at least one organic film. 7, the second sealing film 290 includes the first inorganic film 291, the organic film 292, and the second inorganic film 292. However, the present invention is not limited thereto.

The first inorganic film 291 is formed so as to cover the first sealing film 280 and the black matrix 320. The organic film 292 is formed so as to cover the first inorganic film 291. The organic film 292 is formed to have a thickness sufficient to prevent particles from penetrating the first sealing film 280 and the first inorganic film 291 and entering the organic light emitting layer 262 and the second electrode 263 As shown in Fig. The second inorganic film 293 is formed so as to cover the organic film 292. Each of the first and second inorganic films 291 and 293 may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide or titanium oxide.

The organic film 292 may be formed to fill the step due to the bank 270 and the black matrix 320 as shown in FIG. In this case, the embodiment of the present invention may omit the overcoat layer for planarizing the bank 270 and the step due to the black matrix 320.

The first to third color filters 311, 312, and 313 and the transparent organic film 314 are disposed on the second sealing film 290. When the first to third color filters 311, 312 and 313 are directly formed on the second sealing film 290, it is necessary to align the first substrate 111 and the second substrate 112 In addition, since a separate adhesive layer is not required, the thickness of the display panel can be reduced.

The first color filter 311 is a red color filter arranged corresponding to the red pixel RP and the second color filter 312 is a green color filter arranged corresponding to the green pixel GP, (313) may be a blue color filter arranged corresponding to the blue pixel (BP). The transparent organic film 314 may be disposed corresponding to the white pixel WP. In this case, the first color filter 311 is formed of an organic film containing a red pigment, the second color filter 312 is formed of an organic film containing a green pigment, and the third color filter 313 is formed of a blue And may be formed of an organic film containing a pigment. The transparent organic layer 314 may be formed of an acryl resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

As described above, in the embodiment of the present invention, the black matrix 320 is disposed between the first sealing film 280 and the second sealing film 290. As a result, compared to the case where the color filters 311, 312 and 313 and the black matrix 320 are formed on the second substrate 112, Can be reduced. Therefore, the embodiment of the present invention can prevent the occurrence of color mixture and increase the luminance viewing angle.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100: display device 110: display panel
111: lower substrate 112: upper substrate
120: Gate driver 130: Source drive IC
140: flexible film 150: circuit board
160: timing controller 210: thin film transistor
211: active layer 212: gate electrode
213: source electrode 214: drain electrode
220: gate insulating film 230: interlayer insulating film
240: protective film 250: planarization film
260: organic light emitting element 261: first electrode
262: organic light emitting layer 263: second electrode
270: bank 280: first sealing film
290: second sealing film 291: first inorganic film
292: organic film 293: second inorganic film
311: first color filter 312: second color filter
313: Third color filter 314: Transparent organic film
320: black matrix 330: reflection reducing layer

Claims (10)

Anode electrodes disposed on the first substrate;
An organic light emitting layer disposed on the anode electrodes;
A second electrode disposed on the organic light emitting layer;
A first encapsulation film covering the second electrode;
A black matrix disposed on the first sealing film; And
And a second encapsulation film covering the first encapsulation film and the black matrix. The method according to claim 1,
Further comprising: a bank for partitioning the anode electrodes,
And the black matrix overlaps with the bank. The method according to claim 1,
Wherein each of the first and second sealing films comprises at least one inorganic film. The method of claim 3,
Wherein the second encapsulation layer further comprises at least one organic layer. The method according to claim 1,
Further comprising color filters disposed on the second encapsulation layer. 6. The method of claim 5,
Wherein the black matrix overlaps the boundary of the color filters. 6. The method of claim 5,
Further comprising a reflection reducing layer covering the color filters and blocking a part of light. The method according to claim 6,
Wherein the thickness of the black matrix is thicker than the thickness of the reflection reducing layer. Anode electrodes disposed on the first substrate;
An organic light emitting layer disposed on the anode electrodes;
A second electrode disposed on the organic light emitting layer;
A sealing film covering the second electrode;
Color filters disposed on the sealing film;
A black matrix overlapping the boundary of the color filters; And
And a reflection reducing layer covering the color filters and blocking a part of light. 10. The method of claim 9,
Wherein the thickness of the black matrix is thicker than the thickness of the reflection reducing layer.

Images