KR102618926B1 - Organic light emitting diode display device - Google Patents

Abstract

The present invention provides a substrate including a white pixel area; a blue color filter pattern located in a first area of the white pixel area; an overcoat layer covering the blue color filter pattern and having micro lenses; a first electrode located on the overcoat layer; an organic light-emitting layer covering the first electrode; An organic light emitting display device is provided including a second electrode covering the organic light emitting layer.

Description

Organic light emitting diode display device}

The present invention relates to an organic light emitting display device, and particularly to an organic light emitting display device with improved light extraction efficiency and color temperature.

Recently, as society has entered a full-fledged information age, interest in information displays that process and display large amounts of information has increased, and as the demand for using portable information media has increased, the display field has developed rapidly. In response to this, a variety of lightweight and thin flat panel display devices have been developed and are receiving attention.

Specific examples of such flat panel displays include Liquid Crystal Display device (LCD), Plasma Display Panel device (PDP), Field Emission Display device (FED), and electroluminescent display device. (Electroluminescence Display device: ELD), organic light emitting diode display device (OLED display device), etc. These flat panel displays show excellent performance in terms of thinness, weight, and low power consumption, compared to the existing cathode ray tube (CRT). It is rapidly replacing Cathode Ray Tube (CRT).

Among the above flat panel displays, the organic light emitting display device is a self-luminous device and does not require the backlight used in the liquid crystal display device, which is a non-light emitting device, so it can be lightweight and thin.

In addition, it has an excellent viewing angle and contrast ratio compared to liquid crystal displays, is advantageous in terms of power consumption, can be driven at low direct current voltage, has a fast response speed, is strong against external shocks because the internal components are solid, and has a wide operating temperature range. It has advantages.

In particular, because the manufacturing process is simple, it has the advantage of significantly reducing production costs compared to existing liquid crystal displays.

However, in these OLEDs, a significant portion of the light emitted from the organic light emitting layer is lost in the process of passing through various components of the organic light emitting display device and being emitted to the outside, so the light emitted to the outside of the organic light emitting display device is not emitted from the organic light emitting layer. It only accounts for about 20% of the light.

Here, the amount of light emitted from the organic light emitting layer increases with the size of the current applied to the organic light emitting display device, so the luminance of the organic light emitting display device can be further increased by applying more current to the organic light emitting layer, but this is due to the power consumption. Consumption increases, and the lifespan of the organic light emitting display device also decreases.

Therefore, recently, in order to improve the light extraction efficiency of the organic light emitting display device, a micro lens array (MLA) is attached to the outside of the substrate of the organic light emitting display device, or a micro lens is formed on the overcoat layer of the organic light emitting display device. A method is being proposed.

However, in the case of an organic light emitting display device equipped with a micro lens, a problem occurs in which the color temperature is lowered and the display quality is deteriorated.

The present invention is intended to solve the above problems, and its first purpose is to improve the color temperature in an organic light emitting display device with improved light extraction efficiency.

Through this, the second purpose is to implement high-quality colors, and the third purpose is to improve efficiency by improving the lifespan of the organic light emitting display device.

In order to achieve the object as described above, the present invention includes a substrate including a white pixel area; a blue color filter pattern located in a first area of the white pixel area; an overcoat layer covering the blue color filter pattern and having micro lenses; a first electrode located on the overcoat layer; an organic light-emitting layer covering the first electrode; An organic light emitting display device is provided including a second electrode covering the organic light emitting layer.

In the organic light emitting display device of the present invention, the white pixel area includes a light emitting area and a non-emission area around the light emitting area, and the blue color filter pattern is located in the non-emission area.

In the organic light emitting display device of the present invention, the substrate further includes a first pixel area adjacent to the white pixel area along a first direction, and a first color filter is located in the light emitting area of the first pixel area. do.

In the organic light emitting display device of the present invention, in the non-emission area between the white pixel area and the first pixel area, the overcoat layer has a depression, and the second electrode is located in the depression.

The organic light emitting display device of the present invention further includes a bank located in the non-emission area and covering an edge of the first electrode, and the bank exposes the depression.

In the organic light emitting display device of the present invention, in the depression, the second electrode is located between the first color filter and the blue color filter pattern.

In the organic light emitting display device of the present invention, the first pixel area is a red pixel area, and the first color filter is a red color filter.

The organic light emitting display device of the present invention further includes a metal wiring located between the substrate and the overcoat layer, and the metal wiring overlaps the depression.

In the organic light emitting display device of the present invention, the first pixel area is a blue pixel area, the first color filter is a blue color filter, and the blue color filter pattern extends from the first color filter.

In the organic light emitting display device of the present invention, the micro lens is provided in the non-emission area between the white pixel area and the first pixel area and corresponds to the blue color filter pattern.

In the organic light emitting display device of the present invention, the micro lens has a first aspect ratio in the non-emission area of the white pixel area and a second aspect ratio that is smaller than the first aspect ratio in the light emitting area of the white pixel area.

In the organic light emitting display device of the present invention, the blue color filter pattern corresponds to at least two sides of the light emitting area of the white pixel area.

In the organic light emitting display device of the present invention, the substrate further includes a second pixel area adjacent to the first pixel area in a direction opposite to the white pixel area, and the micro lens provided in the second pixel area is the first pixel area. It corresponds to the emission area of the two pixel area, and the micro lens provided in the white pixel area corresponds to both the emission area and the non-emission area of the white pixel area.

The organic light emitting display device of the present invention further includes a bank located in the non-emission area and having an opening corresponding to the light emitting area, wherein in the second pixel area, an area of the opening is equal to an area of the micro lens, In the white pixel area, the area of the opening is smaller than the area of the micro lens.

The organic light emitting display device of the present invention further includes a bank located in the non-emission area and having an opening corresponding to the light emitting area, wherein the bank has irregularities in the non-emission area between the white pixel area and the first pixel area. The bank has a flat surface in a non-emission area between the first pixel area and the second pixel area.

In the organic light emitting display device of the present invention, at least one of the overcoat layer, the organic light emitting layer, and the second electrode has a concavo-convex surface in a non-emission area between the white pixel area and the first pixel area, and the first pixel A non-emissive area between the area and the second pixel area has a flat surface.

In the organic light emitting display device of the present invention, the micro lens has a first aspect ratio in the first area, and has a second aspect ratio smaller than the first aspect ratio in the second area excluding the first area.

In the organic light emitting display device of the present invention, the first area crosses the white pixel area at the center of the white pixel area.

The organic light emitting display device of the present invention further includes a blue color filter located in a second pixel area adjacent to the white pixel area, and the blue color filter pattern extends from the blue color filter.

The organic light emitting display device of the present invention has the effect of improving light extraction efficiency by including a micro lens.

In addition, by providing a depression in the overcoat layer corresponding to the non-emission area, light leakage caused by light emitted from an adjacent pixel area can be minimized, and light traveling to the adjacent pixel area can be extracted to the outside of the substrate. This has the effect of further improving light extraction efficiency.

Moreover, by providing a blue color filter pattern in the non-emission area or the emission area of the white pixel area, the color temperature of the organic light emitting display device is also improved.

This has the effect of realizing high-quality colors.

1 is a plan schematic diagram schematically showing a pixel of an organic light emitting display device according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line I-I of FIG. 1, schematically showing a portion of an organic light emitting display device according to a first embodiment of the present invention.
Figure 3 is a graph showing the spectrum in a light emitting diode including a micro lens.
Figure 4 is a diagram schematically showing how light is guided in an organic light emitting display device according to an embodiment of the present invention.
Figure 5 is a schematic plan view of a pixel of an organic light emitting display device according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5.
Figures 7a and 7b are photos of luminescence depending on the presence or absence of a micro lens.
Figure 8 is a graph showing the ratio of external light reflection in each pixel area of an organic light emitting display device when a micro lens is applied.
Figure 9 is a schematic plan view of a pixel of an organic light emitting display device according to a third embodiment of the present invention.
Figure 10 is a schematic plan view of a pixel of an organic light emitting display device according to a fourth embodiment of the present invention.
FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. 10.
Figure 12 is a graph showing the change in luminance and color temperature due to the blue color filter pattern in the white pixel area.

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

1 is a plan schematic diagram schematically showing a pixel of an organic light emitting display device according to an embodiment of the present invention.

As shown, the organic light emitting display device 100 (see FIG. 2) according to an embodiment of the present invention has one pixel P divided into red, white, blue, and green pixel areas (R-SP, W-SP, B-SP, G-SP), and each pixel area (R-SP, W-SP, B-SP, G-SP) includes an emission area (EA). Banks 119 are arranged along the edge of the emitting area (EA) to form a non-emitting area (NEA).

In Figure 1, each pixel area (R-SP, W-SP, B-SP, G-SP) has the same width. In contrast, each pixel area (R-SP, W-SP, B-SP, G-SP) may have a different width.

At this time, a driving thin film transistor (DTr) is provided on the non-emission area (NEA) of each pixel area (R-SP, W-SP, B-SP, G-SP), and each pixel area (R-SP, W-SP) SP, B-SP, G-SP) A light emitting diode including a first electrode 111, an organic light emitting layer (113, see FIG. 2), and a second electrode (115, see FIG. 2) on each light emitting area (EA) (E, see Figure 2) is placed.

And red (R), white (W), blue (B), and green (G) light is emitted from the emission area (EA) of each pixel area (R-SP, W-SP, B-SP, G-SP). For this purpose, red, blue, and green color filters (106a) are installed in each emission area (EA) of the red, blue, and green pixel areas (R-SP, B-SP, and G-SP). , 106b, 106c) are located, and white light emitted from the organic light emitting layer 113 (see FIG. 2) is transmitted as is in the white pixel area (W-SP).

Additionally, a plurality of micro lenses 117 (or micro lens arrays (MLA)) are disposed in each light emitting area (EA). The shape of the micro lenses 117 disposed in each light emitting area EA may be the same. This micro lens 117 serves to improve the external light extraction efficiency of the organic light emitting layer 113 (see FIG. 2).

This micro lens 117 is formed by alternating a plurality of concave portions 117b and a plurality of convex portions 117a disposed adjacent to the concave portions 117b on the surface of the overcoat layer 108 (see FIG. 2). .

In addition, at least one recessed portion 108a is provided in the non-emission area (NEA) between neighboring pixel areas (R-SP, W-SP, B-SP, G-SP), -SP, W-SP, B-SP, G-SP) is reflected by metal wiring (not shown), thereby minimizing light leakage.

Here, the depression 108a may be arranged along one edge of the light emitting area EA between neighboring pixel areas R-SP, W-SP, B-SP, and G-SP, but is not limited to this. No. For example, the recessed portion 108a may be disposed in at least one of the upper and lower areas of the light emitting area EA in a plan view, or may be disposed only in at least one area of the left or right side of the light emitting area EA.

In particular, light leakage caused by light generated from neighboring pixel areas (R-SP, W-SP, B-SP, G-SP) is more common in pixel areas adjacent to the left and right compared to pixel areas adjacent to each other up and down. Since it is more strongly visible between the areas (R-SP, W-SP, B-SP, and G-SP), the recessed portion 108a is preferably located on the left and right sides of the light emitting area EA in a plan view.

At this time, in the organic light emitting display device 100 (see FIG. 2) according to an embodiment of the present invention, a blue color is displayed on the non-emissive area (NEA) along the edge of the emitting area (EA) of the white pixel area (W-SP). It is characterized in that a filter pattern 200 is arranged.

Through this, light leakage corresponding to blue occurs in the white pixel area (W-SP), thereby improving the color temperature of the organic light emitting display device 100 (see FIG. 2).

Therefore, it is possible to implement higher quality colors. Let us look at this in more detail with reference to Figure 2.

FIG. 2 is a cross-sectional view taken along line I-I of FIG. 1, schematically showing a portion of an organic light emitting display device according to an embodiment of the present invention.

Meanwhile, the organic light emitting display device 100 according to an embodiment of the present invention is divided into a top emission type and a bottom emission type according to the transmission direction of the emitted light. Hereinafter, in the present invention, the bottom emission type is used. I will explain the light emission method with an example.

In addition, four pixel areas (R-SP, W-SP, B-SP, G-SP) adjacent to each other on the left and right are defined as one pixel (P in Figure 1), and the pixel (P in Figure 1) is defined as We will define the four pixel areas that make up the red, white, blue, and green pixel areas (R-SP, W-SP, B-SP, and G-SP).

At this time, for convenience of explanation, each pixel area (R-SP, W-SP, B-SP, G-SP) is equipped with a light-emitting diode (E), and a light-emitting area (EA) where an image is actually implemented, and a light-emitting area (EA) A non-emissive area (NEA) located along the edge of the area (EA) is defined. Additionally, a switching area (TrA) in which the driving thin film transistor (DTr) in each pixel area (R-SP, W-SP, B-SP, G-SP) is formed is defined in the non-emission area (NEA).

As shown, the organic light emitting display device 100 according to an embodiment of the present invention has a substrate 101 on which a driving thin film transistor (DTr) and a light emitting diode (E) are formed, and is encapsulated ( encapsulation).

Looking at this in more detail, a semiconductor layer 103 is located on the switching area (TrA) of each pixel area (R-SP, W-SP, B-SP, G-SP) on the substrate 101. 103) is made of polysilicon, and its central portion is composed of an active region 103a forming a channel, and source and drain regions 103b and 103c doped with a high concentration of impurities on both sides of the active region 103a. The semiconductor layer 103 may be made of an oxide semiconductor material.

When the semiconductor layer 103 is made of an oxide semiconductor material, a light blocking layer (not shown) may be located below the semiconductor layer 103.

Additionally, a buffer layer (not shown) may be formed between the semiconductor layer 103 and the substrate 101.

A gate insulating film 105 is located on top of the semiconductor layer 103.

Above the gate insulating film 105, a gate electrode 107 corresponding to the active area 103a of the semiconductor layer 103 and a gate wiring (not shown) extending in one direction are provided.

In addition, a first interlayer insulating film 107a is located on the gate electrode 107 and the gate wiring (not shown), and at this time, the first interlayer insulating film 107a and the gate insulating film 105 below it are formed on both sides of the active area 103a. First and second semiconductor layer contact holes 116a and 116b are provided to expose the source and drain regions 103b and 103c, respectively.

Next, on the top of the first interlayer insulating film 107a including the first and second semiconductor layer contact holes 116a and 116b, the source is spaced apart from each other and exposed through the first and second semiconductor layer contact holes 116a and 116b. and source and drain electrodes 110a and 110b in contact with the drain regions 103b and 103c, respectively.

In addition, the second interlayer insulating film 107b is located on the source and drain electrodes 110a and 110b and the first interlayer insulating film 107a exposed between the two electrodes 110a and 110b.

At this time, a semiconductor layer 103 including source and drain electrodes 110a and 110b and source and drain regions 103b and 103c in contact with these electrodes 110a and 110b, and located on top of the semiconductor layer 103. The gate insulating film 105 and the gate electrode 107 form a driving thin film transistor (DTr).

Meanwhile, a data wire 110c defining each pixel area (R-SP, W-SP, B-SP, G-SP) is located across the gate wire (not shown). In addition, a switching thin film transistor (not shown) is formed that has substantially the same structure as the driving thin film transistor (DTr) and is connected to the driving thin film transistor (DTr).

In FIG. 2, the semiconductor layer 103 of the driving thin film transistor (DTr) is made of a polysilicon semiconductor layer or an oxide semiconductor layer and has a top gate structure. Alternatively, the semiconductor layer 103 may be made of pure and impurity amorphous silicon and may have a bottom gate structure.

And color filters 106a, 106b, and 106c corresponding to the emission areas (EA) of the red, blue, and green pixel areas (R-SP, B-SP, and G-SP) are located on the second interlayer insulating film 107b. do.

The color filters 106a, 106b, and 106c are for converting the color of white light emitted from the organic light emitting layer 113, and include a red color filter 106a, a blue color filter 106a, and a green color filter 106a. ) Each of the color filters 106b is located in an emission area (EA) for each red, blue, and green pixel area (R-SP, B-SP, and G-SP). Each of the color filters 106a, 106b, and 106c may be disposed to extend in a portion of the non-emission area (NEA) adjacent to the emission area (EA).

In addition, a separate color filter is not located in the light emitting area (EA) of the white pixel area (W-SP), and the white light emitted from the organic light emitting layer 113 is transmitted as is.

Therefore, the organic light emitting display device 100 of the present invention emits R, W, B, and G colors for each pixel area (R-SP, W-SP, B-SP, and G-SP), providing high brightness full color. will be implemented.

At this time, the organic light emitting display device 100 according to an embodiment of the present invention has a blue color filter pattern 200 in the non-emissive area (NEA) located along the edge of the emitting area (EA) of the white pixel area (W-SP). ) is further provided. Through this, the organic light emitting display device 100 according to an embodiment of the present invention can improve the color temperature.

An overcoat layer 108 having a drain contact hole 117 exposing the drain electrode 110b along with a second interlayer insulating film 107b above the color filters 106a, 106b, and 106c and the blue color filter pattern 200. This is located. In the light emitting area EA, a plurality of concave portions 117b and a plurality of convex portions 117a are alternately arranged on the surface of the overcoat layer 108 to form a micro lens 117.

The overcoat layer 108 is made of an insulating material with a refractive index of about 1.5. For example, the overcoat layer 108 is made of acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, and benzocyclobutene. and photoresist, but is not limited thereto.

Through the overcoat layer 108, whose surface forms the micro lens 117, the organic light emitting display device 100 according to an embodiment of the present invention has improved light extraction efficiency.

And, in the non-emissive area (NEA) between neighboring pixel areas (R-SP, W-SP, B-SP, G-SP), at least one depression 108a is provided on the overcoat layer 108. It is characterized by

At this time, the depth of the depression 108a may be smaller than the height of the overcoat layer 108 in the non-emission area (NEA). Alternatively, the depth of the depression 108a may be the same as the height of the overcoat layer 108, thereby exposing the second interlayer insulating film 107b. Additionally, since the depth of the depression 108a is greater than the height of the overcoat layer 108, the depression 108a may be formed in a portion of the second interlayer insulating film 107b.

On this overcoat layer 108, a first electrode 111 is connected to the drain electrode 110b of the driving thin film transistor DTr and is made of a material with a relatively high work function value and forms the anode of the light emitting diode E. ) is located.

The first electrode 111 is made of a metal oxide such as indium tin oxide (ITO) or indium zinc oxide (IZO), a metal such as ZnO:Al or SnO2:Sb, and an oxide. It may be made of conductive polymers such as mixtures, poly(3-methylthiophene), poly[3,4-(ethylene-1,2-dioxy)thiophene] (PEDT), polypyrrole, and polyaniline. Additionally, it may be made of carbon nanotubes (CNT), graphene, silver nanowire, etc.

This first electrode 111 is located for each pixel area (R-SP, W-SP, B-SP, G-SP), and each pixel area (R-SP, W-SP, B-SP, G- A bank (bank: 119) is located between the first electrodes (111) located for each SP. That is, the bank 119 is located at the border of each pixel area (R-SP, W-SP, B-SP, G-SP) and covers the edge of the first electrode 111.

At this time, in the non-emissive area (NEA) between neighboring pixel areas (R-SP, W-SP, B-SP, G-SP), the bank 119 is located only on the overcoat layer 108, and the overcoat layer ( The depression 108a provided in 108) is exposed.

Overcoat Overcoat And the organic light-emitting layer 113 is located on the top of the first electrode 111 including the bank 119. The organic light-emitting layer 113 may be composed of a single layer made of a light-emitting material to increase light emission efficiency. It may be composed of multiple layers of a hole injection layer, a hole transport layer, an emitting material layer, an electron transport layer, and an electron injection layer. there is.

In addition, a second electrode 115 forming a cathode is located on the entire surface of the organic light emitting layer 113.

The second electrode 115 may be made of a material with a relatively small work function value. At this time, the second electrode 115 is a single layer of an alloy composed of a first metal made of Ag, a metal material with a low work function, etc., and a second metal made of Mg, etc., in a certain ratio, or a stack of the first metal layer and the second metal layer. It can be composed of multiple layers.

When a predetermined voltage is applied to the first electrode 111 and the second electrode 115 according to a selected signal, the organic light emitting display device 100 generates holes injected from the first electrode 111 and the second electrode 115. ) are transported to the organic light-emitting layer 113 to form excitons, and when these excitons transition from the excited state to the ground state, light is generated and emitted in the form of visible light.

At this time, the emitted light passes through the transparent first electrode 111 and goes out, so the organic light emitting display device 100 implements an arbitrary image.

Here, the first electrode 111, the organic light-emitting layer 113, and the second electrode 115, which are sequentially located on the top of the overcoat layer 108, are all formed in the concave portion 117b and The micro lens 117 is formed along the convex portion 117a.

Additionally, the organic light-emitting layer 113 and the second electrode 115 may be disposed to extend to the non-emissive area (NEA). In this case, the organic light-emitting layer 113 and the second electrode 115 may be disposed in the adjacent pixel area (R- It is also disposed on the recessed portion 108a of the overcoat layer 108 provided in the non-emissive area (NEA) between SP, W-SP, B-SP, and G-SP.

Therefore, light leakage caused by reflection from adjacent pixel areas (R-SP, W-SP, B-SP, G-SP) can be minimized.

In addition, a protective film 102 in the form of a thin film is formed on the driving thin film transistor (DTr) and the light emitting diode (E), and the organic light emitting display device 100 is encapsulated through the protective film 102 ( encapsulation).

Here, the protective film 102 serves to prevent external oxygen and moisture from penetrating into the organic light emitting display device 100. For example, the protective film 102 may include the first and second inorganic insulating films and an organic insulating film interposed between them to supplement the impact resistance of the first and second inorganic insulating films.

In this structure in which the organic protective film and the first and second inorganic insulating films are alternately laminated, the second inorganic insulating film must prevent moisture and oxygen from penetrating through the side of the organic insulating film. It is desirable to have a structure that completely surrounds the upper surface and the side surfaces.

Accordingly, the organic light emitting display device 100 can prevent moisture and oxygen from penetrating into the organic light emitting display device 100 from the outside.

In addition, in the organic light emitting display device 100 according to an embodiment of the present invention, a polarizing plate 120 is located on the outer surface of the substrate 101 through which light is transmitted to prevent a decrease in contrast due to external light.

That is, when the organic light emitting display device 100 is in a driving mode that produces an image, the polarizer 120, which blocks external light incident from the outside, is positioned in the transmission direction of the light emitted through the organic light emitting layer 113, thereby maintaining contrast. will improve.

The polarizer 120 is a circularly polarizer for blocking external light, and may be composed of a retardation plate (not shown) and a linear polarizer (not shown) attached to the outer surface of the substrate 101. At this time, a retardation plate may be disposed between the substrate 101 and the linear polarizer.

The retardation plate (not shown) is 1/4. It may be a quarter wave plate (QWP) with a phase retardation value, and the linear polarizer (not shown) has a polarization axis and linearly polarizes light in the direction of the polarization axis.

Through this, the organic light emitting display device 100 according to an embodiment of the present invention can prevent a decrease in contrast by minimizing reflection of external light through the polarizer 120.

As described above, the organic light emitting display device 100 according to an embodiment of the present invention extracts light by forming the surface of the overcoat layer 108 with the micro lens 117 of the concave portion 117b and the convex portion 117a. It improves efficiency.

That is, among the light emitted from the organic light-emitting layer 113, the light that is continuously totally reflected and trapped inside the organic light-emitting layer 113 and the second electrode 115 is reduced to a total reflection critical angle by the micro lens 117 of the second electrode 115. As it progresses at a smaller angle, external luminous efficiency increases through multiple reflections. Accordingly, the light extraction efficiency of the organic light emitting display device 100 is improved.

In particular, by providing a depression 108a in the overcoat layer 108 corresponding to the non-emissive area (NEA) between neighboring pixel areas (R-SP, W-SP, B-SP, G-SP), Light leakage caused by light emitted from the light emitting area (EA) of the pixel area (R-SP, W-SP, B-SP, G-SP) can be minimized.

That is, in an organic light emitting display device equipped with a micro lens, part of the light emitted from the organic light emitting layer toward the substrate is reflected by metal wires such as data wires provided on the substrate and reaches the micro lens in the adjacent pixel area. This causes light leakage.

However, in the organic light emitting display device 100 of the present invention, the overcoat layer 108 has a recessed portion 108a and the second electrode 115 is disposed in the recessed portion 108a, thereby preventing or minimizing light leakage. . That is, even if the light generated from the organic emission layer 113 is reflected by the metal wiring, the light is transmitted to the non-emission area (NEA) of the neighboring pixel areas (R-SP, W-SP, B-SP, G-SP). By being reflected by the second electrode 115 in the recessed portion 108a, light is prevented or minimized from reaching adjacent pixel areas (R-SP, W-SP, B-SP, G-SP).

Looking at this in more detail, generally, the chromaticity of a light source or reference white can be expressed as the temperature of the nearest area on the radiation curve instead of coordinates on a two-dimensional chromaticity table. This is called Correlated Color Temperature (CCT) or color temperature.

Color temperature is used as a numerical value that indicates the degree to which white is close to a color. When a display device expresses a color, if it is close to blue, the color temperature is high, and if it is close to yellow, the color temperature is low.

The higher the color temperature, the higher quality colors are expressed.

In particular, in order for a display device that displays images using a light emitting diode (E) that emits white light to express high-quality colors, it is good for the white color temperature to be high.

Meanwhile, the micro lens 117 is implemented on the light emitting diode (E) by the overcoat layer 108 having a concavo-convex surface, and thus the light efficiency of the organic light emitting display device 100 is improved. However, the improvement in light efficiency by the microlens 117 occurs more significantly in yellow-green light than in blue light.

That is, referring to FIG. 3, which is a graph showing the spectrum in a light emitting diode including a micro lens, the intensity of light (MLA) including a micro lens compared to a light emitting diode (Ref) not including a micro lens ( That is, luminance) increases. At this time, the increase in luminance at the yellow-green wavelength is greater than that at the blue wavelength, and thus the color temperature in the white pixel area (W-SP) decreases.

To compensate for the decrease in color temperature caused by the microlens, the contribution of the blue pixel area (B-SP) can be increased by driving the blue pixel area (B-SP). However, the device efficiency of the blue pixel area (B-SP) is lower than that of other red and green pixel areas (R-SP, G-SP), which increases the power consumption of the blue pixel area (B-SP). do.

The blue pixel area (B-SP), where power consumption increases, shortens the lifespan of the light emitting diode (E), ultimately causing a problem of reducing the efficiency of the panel.

On the other hand, in the organic light emitting display device 100 according to an embodiment of the present invention, a depression 108a is formed in the non-emission area (NEA) located along the edge of the emission area (EA) of the white pixel area (W-SP). ), preventing light leakage from a pixel area adjacent to the white pixel area (W-SP), for example, the red pixel area (R-SP), from entering the white pixel area (W-SP). In addition, by forming the blue color filter pattern 200 in the non-emission area (NEA) of the white pixel area (W-SP), light leakage from the white pixel area (W-SP) is converted to blue. That is, depression. The portion 108a prevents a decrease in color temperature due to light leakage from an adjacent pixel area, and the depression 108a and the blue color filter pattern 200 prevents a decrease in color temperature due to the micro lens 117.

In order to improve the color temperature of white light, the organic light emitting display device 100 according to an embodiment of the present invention increases the contribution of the blue pixel area (B-SP) without substantially driving the blue pixel area (B-SP). This has the effect of improving the color temperature of the organic light emitting display device 100.

Therefore, the organic light emitting display device 100 according to an embodiment of the present invention implements white light with a high color temperature, which is advantageous for expressing high-quality colors.

In addition, since there is no need to increase the contribution of the blue pixel area (B-SP) to improve the color temperature, it is possible to prevent the power consumption of the blue pixel area (B-SP) from increasing, and through this, the light emitting diode (B-SP) can be prevented from increasing. E) The problem of shortening the lifespan and reducing the efficiency of the panel can also be prevented.

Figure 4 is a diagram schematically showing how light is guided in an organic light emitting display device according to an embodiment of the present invention.

As shown, a red pixel area (R-SP) and a white pixel area (W-SP) are disposed adjacent to each other with the data wire 110c in between, on the substrate 102. The red pixel area (R-SP) ), the red color filter 106a is located on the upper part of the second interlayer insulating film 107b of the emission area EA, and the non-emission area surrounding the edge of the emission area EA of the white pixel area W-SP ( A blue color filter pattern 200 is located on the second interlayer insulating film 107b on the NEA).

And an overcoat layer 108 is located above the red color filter 106a and the blue color filter pattern 200. The overcoat layer 108 is located on the light emitting area (EA) of each pixel area (R-SP, W-SP). ), a micro lens 117 including a plurality of convex parts 117a and a plurality of concave parts 117b is provided, and a non-emission area (NEA) between each pixel area (R-SP, W-SP) is provided. ), a recessed portion 108a is provided in response.

The blue color filter pattern 200 located in the non-emission area (NEA) surrounding the edge of the emission area (EA) of the white pixel area (W-SP) is located in the white pixel area (W-SP) and the red pixel area (R-SP). It is located between the recessed portion 108a provided in the non-emission area (NEA) between SP) and the emission area (EA) of the white pixel area (W-SP).

In addition, a first electrode 111 is provided for each pixel area (R-SP, W-SP) on the top of the overcoat layer 108 corresponding to the light emitting area (EA), and an organic electrode 111 is provided on top of the first electrode 111. The light emitting layer 113 and the second electrode 115 are sequentially stacked to form a light emitting diode (E).

At this time, a bank 119 is located between the first electrode 111 located on the red pixel area (R-SP) and the first electrode 111 located on the white pixel area (W-SP), and the bank ( 119) is disposed to expose the recessed portion 108a of the overcoat layer 108, and the organic light-emitting layer 113 and the second electrode 115 are also disposed on the recessed portion 108a of the overcoat layer 108.

The substrate 101 on which these light emitting diodes are formed is encapsulated by a protective film 102.

At this time, while the light emitted from the organic light emitting layer 113 in the red pixel area (R-SP) passes through the red color filter 106a and the substrate 101 and is emitted to the outside, some of the light passes through the data line 110c. It is reflected and proceeds toward the white pixel area (W-SP). At this time, the light L1 traveling toward the white pixel area (W-SP) is reflected again by the second electrode 115 covering the recessed portion 108a provided in the overcoat layer 108 and is reflected back to the red pixel area (R). -SP) reaches the micro lens 117, is reflected multiple times by the micro lens 117, and is emitted to the outside.

Through this, light leakage caused by reflection of light emitted from the red pixel area (R-SP) into the white pixel area (W-SP) can be prevented. In particular, light traveling to other light-emitting areas can be prevented from occurring again. As the light is reflected and extracted to the outside, the light extraction efficiency of the organic light emitting display device (100 in FIG. 2) is further improved.

In addition, the light leak L2 in the red pixel area (R-SP) passes through the red color filter 106a and is then blocked by the blue color filter pattern 200, thereby causing light to enter the white pixel area (W-SP). is prevented. Accordingly, a decrease in the color temperature of the white pixel area (W-SP) due to light leakage from the red pixel area (R-SP) is prevented.

Also, even within the white pixel area (W-SP), some of the light emitted from the organic light emitting layer 113 is reflected by the data line 110c and heads toward an adjacent pixel area, for example, the red pixel area (R-SP). The light L3 traveling toward the red pixel area (R-SP) is reflected again by the second electrode 115 in the recessed portion 108a provided in the overcoat layer 108 and is reflected back to the white pixel area (R-SP). It reaches the micro lens 117 in the W-SP, is reflected multiple times by the micro lens 117, and is emitted to the outside.

Through this, light leakage caused by reflection of light emitted from the white pixel area (W-SP) into the red pixel area (R-SP) can be prevented. In particular, light traveling to other light-emitting areas can be prevented from occurring again. As the light is reflected and emitted to the outside, the light extraction efficiency of the organic light emitting display device (100 in FIG. 2) is further improved.

In addition, the light re-reflected into the white pixel area (W-SP) passes through the blue color filter pattern 200 provided in the non-emissive area (NEA), thereby changing the color temperature of the organic light emitting display device (100 in FIG. 2). is improved.

As described above, in the organic light emitting display device (100 in FIG. 2) according to an embodiment of the present invention, the surface of the overcoat layer 108 is formed with micro lenses 117 of concave portions 117b and convex portions 117a. This improves light extraction efficiency.

And, by providing a depression 108a in the overcoat layer 108 corresponding to the non-emission area (NEA) between the neighboring pixel areas (R-SP, W-SP), the adjacent pixel areas (R-SP, W-SP) It is possible to minimize light leakage caused by light emitted from the light emitting area (EA) of -SP), and to extract light traveling to adjacent pixel areas (R-SP, W-SP) to the outside of the substrate 101. This can further improve light extraction efficiency.

In particular, by providing a blue color filter pattern 200 on the non-emission area (NEA) along the edge of the emitting area (EA) of the white pixel area (W-SP), the red color adjacent to the white pixel area (W-SP) Light leakage from the white pixel area (W-SP) is blocked from the pixel area (R-SP), and light leakage from the white pixel area (W-SP) is blue-shifted, thereby improving the color temperature.

Therefore, the organic light emitting display device (100 in FIG. 2) according to an embodiment of the present invention implements white light with a high color temperature, which is advantageous for expressing high-quality colors.

In particular, by using light leakage reflected from the red pixel area (R-SP) to improve color temperature, problems caused by light leakage can also be resolved, making it possible to implement higher quality colors.

In addition, since there is no need to increase the contribution of the blue pixel area (B-SP in FIG. 2) to improve the color temperature, the power consumption of the blue pixel area (B-SP in FIG. 2) can be prevented from increasing. , This can also prevent the problem of shortening the lifespan of the light emitting diode (E) and reducing the efficiency of the panel.

FIG. 5 is a schematic plan view of a pixel of an organic light emitting display device according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5.

As shown in FIGS. 5 and 6, in the organic light emitting display device 300 according to the second embodiment of the present invention, red, white, blue, and green pixel areas are arranged along the first direction (horizontal direction). (R-SP, W-SP, B-SP, G-SP) constitute one pixel.

Each pixel area (R-SP, W-SP, B-SP, G-SP) includes a non-emission area (NEA) where the bank 319 is disposed and an emission area (EA) surrounded by the bank 319. A light emitting diode (E) including a first electrode 311, an organic light emitting layer 313, and a second electrode 315 is formed in the light emitting area (EA).

A driving thin film transistor (DTr) is provided on the non-emission area (NEA) of each pixel area (R-SP, W-SP, B-SP, G-SP). For example, the driving thin film transistor (DTr) may include a semiconductor layer, a gate electrode, a source electrode, and a drain electrode.

Referring to FIG. 6 along with FIG. 2 , a semiconductor layer 103 is formed on a substrate 301, and a gate insulating film 305 covering the semiconductor layer 103 is formed on the entire surface of the substrate 301. A gate electrode 107 overlapping the semiconductor layer 103 is formed on the gate insulating film 305, and a first interlayer insulating film 307a is formed covering the gate electrode 107. In addition, a source electrode 110a and a drain electrode 110b are formed on the first interlayer insulating film 307a, spaced apart from each other and in contact with both ends of the semiconductor layer 103 (source region 103b and drain region 103c). .

Additionally, the gate wire 302 extends along the first direction on the gate insulating film 305, and the data wire 310c extends along the second direction on the first interlayer insulating film 307a. The gate wire 302 and the data wire 310c cross each other to define each pixel area (R-SP, W-SP, B-SP, G-SP).

A second interlayer insulating film 307b is formed on the data line 310c, and red, blue, and green pixel regions (R-SP, B-SP, G-SP) are formed on the second interlayer insulating film 307b. Blue and green color filters 306a, 306b, and 306c are formed. Additionally, the blue color filter pattern 330 is formed in the non-emission area (NEA) between the white pixel area (W-SP) and the blue pixel area (B-SP). In FIG. 6, the blue color filter pattern 330 extends in a first direction (horizontal direction) from the blue color filter 306b toward the white pixel area (W-SP). Alternatively, the blue color filter pattern 330 may be disposed at a certain distance from the blue color filter 306b.

The red and green color filters 106a and 106c have an area substantially the same as the emission area EA of the red and green pixel areas R-SP and G-SP. Meanwhile, since the blue color filter 306b is extended to form the blue color filter pattern 330, the area of the blue color filter 306b including the blue color filter pattern 330 is that of the blue pixel area (B-SP). It is larger than the light emitting area (EA) area.

Meanwhile, the second interlayer insulating film 307b may be omitted. In this case, the red, blue, and green color filters 306a, 306b, and 306c are formed on the first interlayer insulating film 307a, and the blue color filter pattern 330 is formed in contact with the data wire 310c.

An overcoat layer 308 is formed covering the red, blue, and green color filters 306a, 306b, and 306c and the blue color filter pattern 330. The overcoat layer 308 has an uneven surface. That is, a plurality of concave portions 317b and a plurality of convex portions 317a are alternately arranged on the surface of the overcoat layer 308 to form a micro lens 317.

In the red and green pixel areas (R-SP, G-SP), the micro lens 317 has an area substantially the same as the light emitting area (EA). That is, in the red and green pixel areas (R-SP, G-SP), the micro lens 317 has an area substantially the same as the red and green color filters 306a and 306c.

Meanwhile, in the white and blue pixel areas (W-SP, B-SP), the micro lens 317 has an area larger than the light emitting area (EA). That is, the micro lens 317 of the white pixel area (W-SP) and/or the micro lens 317 of the blue pixel area (B-SP) is located between the white and blue pixel areas (W-SP, B-SP). It extends to the non-emissive area (NEA).

For example, a non-emissive area (NEA) between the red pixel area (R-SP) and the white pixel area (W-SP) and/or between the blue pixel area (B-SP) and the green pixel area (G-SP). The overcoat layer 308 has a flat surface, and in the non-emissive area (NEA) between the white pixel area (W-SP) and the blue pixel area (B-SP), the overcoat layer 308 has an uneven surface and forms a micro lens ( 317).

The overcoat layer 308 is made of an insulating material with a refractive index of about 1.5. For example, the overcoat layer 308 is made of acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, and benzocyclobutene. and photoresist.

Although not shown, a depression (108a in FIG. 4) may be formed in the overcoat layer 308 corresponding to the non-display area (NEA). In this case, in the depression 108a between the blue pixel area (B-SP) and the white pixel area (W-SP), the second electrode 315 is connected to the blue color filter 306b of the blue pixel area (B-SP). ) and the blue color filter pattern 330 of the white pixel area (W-SP).

A first electrode 311 is located on the overcoat layer 308 for each pixel region (R-SP, W-SP, B-SP, G-SP). The first electrode 311 is connected to the driving thin film transistor DTr through a drain contact hole (117 in FIG. 2). The first electrode 311 is made of a material with a relatively high work function value and can serve as an anode.

The bank 319 covers the edge of the first electrode 311 and is located in the non-emission area (NEA). That is, the bank 319 has an opening that exposes the first electrode 311, and the opening is in the light emitting area (EA) in each pixel area (R-SP, W-SP, B-SP, G-SP). corresponds to In other words, the bank 319 surrounds the light emitting area EA and is formed on the overcoat layer 308.

As described above, the overcoat layer 308 has a flat surface in the non-emissive area (NEA) between the red pixel area (R-SP) and the white pixel area (W-SP). It has a concavo-convex surface in the non-emissive area (NEA) between the blue pixel area (B-SP) and the blue pixel area (B-SP).

Accordingly, the bank 319 has a first bank 319a having a flat surface in the non-emission area (NEA) between the red pixel area (R-SP) and the white pixel area (W-SP) and the white pixel area (W-SP). It includes a second bank 319b having a convex-convex surface in the non-emission area (NEA) between the blue pixel area (SP) and the blue pixel area (B-SP). In Figure 6, the uneven surface of the second bank 319b has a higher flatness than the uneven surface of the overcoat layer 308. That is, the uneven surface of the second bank 319b has a different shape from the uneven surface of the overcoat layer 308. In contrast, the second bank 319b has a concavo-convex surface having the same shape as the overcoat layer 308. Alternatively, the uneven shape of the second bank 319b may be different from the uneven shape of the overcoat layer 308.

Although not shown, the bank 319 has a flat surface between the blue pixel area (R-SP) and the green pixel area (G-SP).

An organic light-emitting layer 313 is formed covering the bank 319 and the first electrode 311. That is, the organic emission layer 313 contacts the first electrode 311 in the emission area (EA) and contacts the bank 319 in the non-emission area (NEA).

The organic light emitting layer 313 is formed on the entire display area including red, white, blue, and green pixel areas (R-SP, W-SP, B-SP, and G-SP).

A second electrode 315 is formed on the organic light emitting layer 313. The second electrode 315 is made of a material with a relatively low work function value and can serve as a cathode.

The first and second electrodes 311 and 315 facing each other and the organic light emitting layer 313 between them constitute a light emitting diode (E).

At this time, in the light emitting area EA, the first electrode 311, the organic light emitting layer 313, and the second electrode 315 have concave portions 317b and convex portions 317a provided on the surface of the overcoat layer 308. A micro lens 317 is implemented depending on the shape.

Additionally, in the non-emissive area (NEA) between the white pixel area (W-SP) and the blue pixel area (B-SP), the organic light emitting layer 313 and the second electrode 315 are formed by the overcoat layer 308 and or the second electrode 315. The micro lens 117 is formed according to the shape of the concave portion 117b and the convex portion 117a provided on the surface of the second bank 319b.

That is, in the white pixel area (W-SP), the microlens 317 corresponds to both the emission area (EA) and the non-emission area (NEA). Meanwhile, for example, in the green pixel area (G-SP), the micro lens 317 corresponds to the emitting area (EA) excluding the non-emission area (NEA).

The micro lens 317 is provided in the non-emission area (NEA) between the white pixel area (W-SP) and the blue pixel area (B-SP) and corresponds to the blue color filter pattern 330.

In the present invention, the micro lens 317 is provided in the non-emissive area (NEA) between the white pixel area (W-SP) and the blue pixel area (B-SP), so the bank 319 in the white pixel area (W-SP) ) The opening area is smaller than the area of the micro lens 317. Meanwhile, for example, in the green pixel area (W-SP), the micro lens 317 is formed only in the emission area (EA), so the opening area of the bank 319 in the green pixel area (G-SP) is the micro lens ( 317) is substantially the same as the area of 317).

A protective film (102 in FIG. 2) in the form of a thin film is formed on the light emitting diode (E), and the organic light emitting display device 300 can be encapsulated through the protective film 102. Additionally, a polarizing plate (120 in FIG. 2) may be located on the outer surface of the substrate 301 to prevent reflection of external light.

The light emitting diode (E) emits white light. For example, the organic light emitting layer 313 of the light emitting diode (E) includes a first light emitting stack including a blue light emitting material layer, a second light emitting stack including a yellow-green light emitting material layer, the first and It may include a charge generation layer located between the second light emitting stacks.

Between the light emitting diode (E) and the substrate 301, red, blue, and green color filters 306a, 306b, and 306c are provided corresponding to the red, blue, and green pixel areas (R-SP, B-SP, and G-SP). Located. Therefore, the white light from the light emitting diode (E) passes through the red, blue, and green color filters 306a, 306b, and 306c, respectively, and enters the red, blue, and green pixel areas (R-SP, B-SP, and G-SP). ), red, blue and green lights are displayed.

A color filter is not formed in the white pixel area (W-SP), and white light from the light emitting diode (E) is displayed.

As explained in Figure 3, the color temperature in the white pixel area (W-SP) is lowered by the micro lens.

Meanwhile, referring to FIGS. 7A and 7B, which are photos of light emission with and without a micro lens, in the pixel area of the light emitting diode that does not include a micro lens, light is emitted only in the light emitting area (FIG. 7a), but as in the present invention, light is not emitted. In the pixel area of a light emitting diode equipped with a micro lens, light blur occurs in a non-emission area.

As described above, in the organic light emitting display device 300 of the present invention, light efficiency is improved by the micro lens 317, and the micro lens 317 is placed in the non-emission area (NEA) of the white pixel area (W-SP). ) and the blue color filter pattern 330 is formed, thereby increasing the blue component using the blurred light. That is, the light emitted from the light emitting diode (E) in the white pixel area (W-SP) passes through the blue color filter pattern 330 through the micro lens 317 in the non-emission area (NEA) toward the substrate 301. can be passed on. In addition, the light emitted from the light emitting diode (E) in the white pixel area (W-SP) is reflected by, for example, the gate insulating film 305 or the substrate 301 and is transmitted to the micro lens 317 in the non-emission area (NEA). It may be transmitted through the blue color filter pattern 330 and toward the substrate 301.

Accordingly, a decrease in color temperature in the white pixel area (W-SP) caused by the micro lens 317 is prevented or minimized.

For example, in the green pixel area (G-SP), the micro lens 317 is formed only in the emission area (EA). In contrast, when the microlens 317 of the green pixel area (G-SP) extends into the non-emission area (EA), display quality deteriorates.

Meanwhile, when a micro lens is provided, there is a problem that reflection of external light increases. This external light reflection has a different intensity for each pixel area.

That is, referring to Figure 8, which is a graph showing the ratio of external light reflection in each pixel area of an organic light emitting display device when a micro lens is applied, the ratio in the red and green pixel areas is smaller than that of the white pixel area and larger than that of the blue pixel area. . (Measured using DMS-803 equipment) In particular, the reflectance (AR) ratio in the white pixel area is very high. That is, in the white pixel area without a color filter, the amount of external light reflection by the micro lens greatly increases, and the external light reflection is reduced by the blue color filter.

As described above, in the organic light emitting display device 300 of the present invention, the micro lens 317 is located not only in the emission area (EA) but also in the non-emission area between the white pixel area (W-SP) and the blue pixel area (B-SP). Since it is also formed in the (NEA), a problem of increased external light reflection due to the micro lens 317 may occur. However, the increase in external light reflection due to the expansion of the micro lens 317 is minimized by the blue color filter pattern 330 in the non-emission area (NEA) between the white pixel area (W-SP) and the blue pixel area (B-SP). do.

Therefore, in the organic light emitting display device 300 of the present invention, light efficiency is improved by the micro lens 317 structure, and the micro lens 317 and By expanding the blue color filter 306b, a decrease in color temperature and reflection of external light caused by the micro lens 317 are prevented or minimized.

Figure 9 is a schematic plan view of a pixel of an organic light emitting display device according to a third embodiment of the present invention.

As shown in FIG. 9, in the organic light emitting display device 300 according to the third embodiment of the present invention, red, white, blue, and green pixel regions (R-) are arranged along the first direction (horizontal direction). SP, W-SP, B-SP, G-SP) constitute one pixel.

The gate wire 302 extending along the first direction and the data wire 310c extending along the second direction intersect to define each pixel area (R-SP, W-SP, B-SP, G-SP). Each pixel area (R-SP, W-SP, B-SP, G-SP) is provided with an emission area (EA) and a non-emission area (NEA) surrounding the emission area (EA).

In the white pixel area (W-SP), the non-emission area (NEA) includes a first non-emission area (NEA1) located between the white pixel area (W-SP) and the blue pixel area (B-SP), and a first Second and third non-emission areas (NEA2, NEA3) extending from the non-emission area (NEA1) to the upper and lower sides of the white pixel area (W-SP) along the first direction, and the second and third non-emission areas (NEA2, NEA3) It includes a fourth non-emissive area (NEA4) connecting NEA2 and NEA3). That is, the fourth non-emission area (NEA4) is located between the white pixel area (W-SP) and the red pixel area (R-SP). On the other hand, when the green pixel area (G-SP) is located adjacent to the white pixel area (W-SP), the fourth non-emission area (NEA4) is adjacent to the white pixel area (W-SP) and the green pixel area (G-SP). -SP). The blue color filter pattern 330 may extend in a first direction (horizontal direction) from the blue color filter 306b toward the white pixel area (W-SP). Alternatively, the blue color filter pattern 330 may be disposed at a certain distance from the blue color filter 306b.

Red, blue, and green color filters 306a, 306b, and 306c are located corresponding to the red, blue, and green pixel areas (R-SP, B-SP, and G-SP). Additionally, the blue color filter pattern 330 is located in the first to third non-emission areas (NEA1, NEA2, NEA3) of the white pixel area (W-SP).

That is, unlike the organic light emitting display device of the second embodiment shown in FIG. 4, in the organic light emitting display device of the third embodiment, the blue color filter pattern 330 is formed corresponding to three sides of the white pixel area (W-SP). do.

In contrast, the blue color filter pattern 330 in the second non-emission area (NEA2) or the third non-emission area (NEA3) of the white pixel area (W-SP) may be omitted, and the blue color filter pattern 330 ) may also be formed in the fourth non-emission area (NEA4) of the white pixel area (W-SP). That is, the blue color filter pattern 330 may correspond to at least two sides of the emission area (EA) of the white pixel area (W-SP).

Although not shown, the organic light emitting display device 300 includes a micro lens (317 in FIG. 6), and the micro lens 317 has a ratio between the white pixel area (W-SP) and the blue pixel area (B-SP). It is extended to the second and third non-emission areas (NEA2, NEA3) of the emitting area and the white pixel area (W-SP) and corresponds to the blue color filter pattern 330.

As described above, in the organic light emitting display device 300 of the present invention, light efficiency is improved by the micro lens 317 structure, and a micro lens ( By expanding the blue color filter 317) and the blue color filter 306b, the color temperature decrease and external light reflection due to the micro lens 317 are prevented or minimized.

FIG. 10 is a schematic plan view of a pixel of an organic light emitting display device according to a fourth embodiment of the present invention, and FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. 10.

As shown in FIGS. 10 and 11, in the organic light emitting display device 400 according to the fourth embodiment of the present invention, red, white, blue, and green pixel regions are arranged along the first direction (horizontal direction). (R-SP, W-SP, B-SP, G-SP) constitute one pixel.

Each pixel area (R-SP, W-SP, B-SP, G-SP) has a non-emission area (NEA) where a bank (319 in FIG. 6) is placed and an emission area (EA) surrounded by the bank 319. Includes. A light emitting diode (E) including a first electrode 411, an organic light emitting layer 413, and a second electrode 415 is formed in the light emitting area (EA).

A driving thin film transistor (DTr) is provided on the non-emission area (NEA) of each pixel area (R-SP, W-SP, B-SP, G-SP). For example, the driving thin film transistor (DTr) may include a semiconductor layer, a gate electrode, a source electrode, and a drain electrode.

Referring to Figures 10 and 11 along with Figure 2, a semiconductor layer 103 is formed on the substrate 401, and a gate insulating film 405 covering the semiconductor layer 103 is formed on the entire surface of the substrate 401. A gate electrode 107 overlapping the semiconductor layer 103 is formed on the gate insulating film 405, and a first interlayer insulating film 407a is formed covering the gate electrode 107. In addition, a source electrode 110a and a drain electrode 110b are formed on the first interlayer insulating film 407a, spaced apart from each other and in contact with both ends of the semiconductor layer 103 (source region 103b and drain region 103c). .

Additionally, the gate wire 402 extends along the first direction on the gate insulating film 405, and the data wire 410c extends along the second direction on the first interlayer insulating film 407a. The gate wire 402 and the data wire 410c cross each other to define each pixel area (R-SP, W-SP, B-SP, G-SP).

A second interlayer insulating film 407 is formed on the data line 410c, and red, blue, and green pixel regions (R-SP, B-SP, G-SP) are formed on the second interlayer insulating film 407. Blue and green color filters 406a, 406b, and 406c are formed. Additionally, a blue color filter pattern 430 is formed in a portion of the white pixel area (W-SP). For example, the blue color filter pattern 430 may be located in the center of the white pixel area (W-SP) and moves in a first direction (horizontal direction) from the blue color filter 406b toward the white pixel area (W-SP). ) can be extended. Alternatively, the blue color filter pattern 430 may be disposed at a certain distance from the blue color filter 406b.

Meanwhile, the second interlayer insulating film 407b may be omitted. In this case, red, blue, and green color filters 406a, 406b, and 406c and a blue color filter pattern 430 are formed on the first interlayer insulating film 407a.

An overcoat layer 408 is formed covering the red, blue, and green color filters 406a, 406b, and 406c and the blue color filter pattern 430. The overcoat layer 408 has an uneven surface. That is, a plurality of concave portions 444 and 454 and a plurality of convex portions 442 and 452 are alternately arranged on the surface of the overcoat layer 408 to form the first and second micro lenses 440 and 450. In the white pixel area (W-SP), the first micro lens 440 corresponds to the blue color filter pattern 430 and the second micro lens 450 corresponds to the light emitting area (EA) excluding the blue color filter pattern 430. corresponds to

The overcoat layer 408 is made of an insulating material with a refractive index of about 1.5. For example, the overcoat layer 408 is made of acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene resin, polyphenylene sulfide resin, and benzocyclobutene. and photoresist.

Although not shown, a depression (108a in FIG. 3) may be formed in the overcoat layer 408 corresponding to the non-display area (NEA). In this case, in the depression 108a between the blue pixel area (B-SP) and the white pixel area (W-SP), the second electrode 415 is connected to the blue color filter 406b of the blue pixel area (B-SP). ) and the blue color filter pattern 430 of the white pixel area (W-SP).

A first electrode 411 is located on the overcoat layer 408 for each pixel region (R-SP, W-SP, B-SP, G-SP). The first electrode 411 is connected to the driving thin film transistor DTr through a drain contact hole (117 in FIG. 2). The first electrode 411 is made of a material with a relatively high work function value and can serve as an anode.

The bank 319 covers the edge of the first electrode 411 and is located in the non-emission area (NEA). That is, the bank 419 has an opening that exposes the first electrode 411, and the opening is in the light emitting area (EA) in each pixel area (R-SP, W-SP, B-SP, G-SP). corresponds to In other words, the bank 319 surrounds the light emitting area EA and is formed on the overcoat layer 408.

An organic light emitting layer 413 is formed covering the bank 319 and the first electrode 411. That is, the organic emission layer 413 contacts the first electrode 411 in the emission area (EA) and contacts the bank 319 in the non-emission area (NEA).

The organic light emitting layer 413 is formed on the entire display area including red, white, blue, and green pixel areas (R-SP, W-SP, B-SP, and G-SP).

A second electrode 415 is formed on the organic light emitting layer 413. The second electrode 415 is made of a material with a relatively low work function value and can serve as a cathode.

The first and second electrodes 411 and 415 facing each other and the organic light emitting layer 413 between them constitute a light emitting diode (E).

At this time, in the light emitting area EA, the first electrode 411, the organic light emitting layer 413, and the second electrode 415 have concave portions 444 and 454 and convex portions ( 442, 452) The first and second micro lenses 440, 450 are implemented.

As described above, in the white pixel area (W-SP), the first micro lens 440 corresponds to the blue color filter pattern 430 and the second micro lens 450 corresponds to the blue color filter pattern 430. Corresponds to the luminous area (EA).

A protective film (102 in FIG. 2) in the form of a thin film is formed on the top of the light emitting diode (E), and the organic light emitting display device 400 can be encapsulated through the protective film 102. Additionally, a polarizing plate (120 in FIG. 2) may be located on the outer surface of the substrate 401 to prevent reflection of external light.

The light emitting diode (E) emits white light. For example, the organic light emitting layer 413 of the light emitting diode (E) includes a first light emitting stack including a blue light emitting material layer, a second light emitting stack including a yellow-green light emitting material layer, the first and It may include a charge generation layer located between the second light emitting stacks.

Between the light emitting diode (E) and the substrate 410, red, blue, and green color filters 406a, 406b, and 406c are provided corresponding to the red, blue, and green pixel areas (R-SP, B-SP, and G-SP). Located. Therefore, the white light from the light emitting diode (E) passes through the red, blue, and green color filters 406a, 406b, and 406c, respectively, and enters the red, blue, and green pixel areas (R-SP, B-SP, and G-SP). ), red, blue and green lights are displayed.

As described above, the microlenses 440 and 450 are implemented on the light emitting diode (E) by the overcoat layer 408 having a concavo-convex surface, and thus the light efficiency of the organic light emitting display device 400 is improved.

However, the improvement in light efficiency by the microlenses 420 and 430 occurs more significantly in yellow-green light than in blue light.

That is, as explained in FIG. 6, the intensity of light (i.e., luminance) increases in the light emitting diode (MLA) including a micro lens compared to the light emitting diode (Ref) that does not include a micro lens. At this time, the increase in luminance at the yellow-green wavelength is greater than that at the blue wavelength, and thus the color temperature in the white pixel area (W-SP) decreases.

However, in the organic light emitting display device 400 of the present invention, the blue color filter pattern 430 is formed in a portion of the white pixel area (W-SP), thereby compensating for the decrease in color temperature caused by the micro lenses 420 and 430. .

In addition, the blue color filter pattern 430 is located in the center of the white pixel area (W-SP), so even in case of misalignment, the blue color filter pattern 430 is displayed in the emission area (EA) of the white pixel area (W-SP). The area of (430) is maintained. Therefore, uniformity of color temperature improvement by the blue color filter pattern 430 is secured.

For example, as in the organic light emitting display device 300 shown in FIG. 9, the blue color filter pattern 330 is located in the second and third non-emission areas (NEA2, NEA3) of the white pixel area (W-SP). If an alignment defect occurs in the vertical direction (second direction), the area of the blue color filter pattern 330 is reduced in the white pixel area (W-SP) and the desired color temperature is not realized.

However, in the organic light emitting display device 400 of the present invention, the blue color filter pattern 430 is located in the center of the white pixel area (W-SP), thereby forming the light emitting area (EA) of the white pixel area (W-SP). The area of the blue color filter pattern 430 is maintained and the uniformity of color temperature improvement by the blue color filter pattern 430 is secured.

Meanwhile, luminance and color temperature change depending on the area ratio of the blue color filter pattern 430 formed in the emission area (EA) of the white pixel area (W-SP). Referring to FIG. 12, which is a graph showing the change in luminance and color temperature due to the blue color filter pattern in the white pixel area, the area ratio of the blue color filter pattern 430 to the emission area (EA) of the white pixel area (W-SP) ( As Blue%) increases, the efficiency of the white pixel area (W-SP) decreases. That is, as the area of the blue color filter pattern 430 increases, luminance decreases. Meanwhile, as the area ratio (Blue%) of the blue color filter pattern 430 to the emission area (EA) of the white pixel area (W-SP) increases, the color temperature increases. That is, the luminance and color temperature of the blue color filter pattern 430 in the emission area (EA) of the white pixel area (W-SP) have a trade-off relationship.

Meanwhile, external light reflection and luminous efficiency change depending on the aspect ratio of the convex part of the microlens. That is, when the aspect ratio of the convex part of the micro lens is relatively large, external light reflection and luminous efficiency (light extraction efficiency by the micro lens) increase.

Additionally, as described above, since external light reflection is canceled by the color filter, the problem of external light reflection occurs significantly in the white pixel area (W-SP) without a color filter.

The white pixel area (W-SP) of the organic light emitting display device 400 of the present invention is provided with first and second micro lenses 440 and 450, and the first micro lens corresponds to the blue color filter pattern 430. The first width w1 of the convex portion 442 in 440 is smaller than the second width w2 of the convex portion 452 in the second micro lens 450 . At this time, in the first and second micro lenses 440 and 450, the convex portions 442 and 452 have the same height. In other words, the aspect ratio of the first micro lens 440, that is, the aspect ratio (=height/width) of the convex portion 442 is greater than the aspect ratio of the second micro lens 450.

In Figure 11, the first and second micro lenses 440 and 450 have the same height but different pitches. In contrast, the first and second micro lenses 440 and 450 may have the same pitch but have different heights. At this time, the first micro lens 440 has a greater height than the second micro lens 450.

Accordingly, the first micro lens 440 has high external light reflection and light extraction efficiency, and the second micro lens 450 has low external light reflection and light extraction efficiency.

As described above, in the white pixel area (W-SP), since the blue color filter pattern 430 is formed corresponding to the first micro lens 440, external light reflection by the first micro lens 440 Even if it increases, external light reflection is blocked by the blue color filter pattern 430. Therefore, external light reflection does not increase due to the first micro lens 440. Meanwhile, light extraction efficiency is improved by the first micro lens 440 and a decrease in luminance caused by the blue color filter pattern 430 is prevented.

Meanwhile, in an area in the emission area (EA) of the white pixel area (W-SP) where the blue color filter pattern 430 is not formed, the pitch of the second micro lens 440 increases to reduce external light reflection.

Therefore, in the organic light emitting display device 400 of the present invention, external light reflection is minimized, the color temperature in the white pixel area (W-SP) is improved or maximized, and luminance degradation due to the blue color filter pattern 430 is prevented. You can.

Alternatively, the first and second micro lenses 440 and 450 may have the same aspect ratio.

Meanwhile, in the organic light emitting display device 300 of FIGS. 4 and 9, the pitch of the micro lens 317 corresponding to the blue color filter pattern 330 is in the light emitting area (EA) of the white pixel area (W-SP). It may be smaller than the pitch of the formed micro lens 317.

The present invention is not limited to the above embodiments, and can be implemented with various changes without departing from the spirit of the present invention.

101, 301, 401: substrate 102: protective film
105, 304, 405: Gate insulating film 106a, 306a, 406a: Red color filter
106b, 306b, 406b: Blue color filter 106c, 306c, 406c: Green color filter
108, 308, 408: overcoat layer 108a: depression
107a, 307a, 407a: first interlayer insulating film
107b, 307b, 407b: second interlayer insulating film
110c, 310c, 410c: data wiring
111, 311, 411: first electrode 113, 313, 413: organic light emitting layer
115, 315, 415: second electrode
117, 317, 440, 450: Micro lens
117a, 317a, 442, 452: convex portion 117b, 317b, 444, 454: concave portion
119, 319: Bank
200, 330, 430: Blue color filter pattern
E: light emitting diode

Claims (19)

A substrate including a white pixel area;
a blue color filter pattern located in a first area of the white pixel area;
an overcoat layer covering the blue color filter pattern and having micro lenses;
a first electrode located on the overcoat layer;
an organic light-emitting layer covering the first electrode;
A second electrode covering the organic light emitting layer
An organic light emitting display device including a.
According to claim 1,
The white pixel area includes a light-emitting area and a non-light-emitting area around the light-emitting area,
The blue color filter pattern is located in the non-emission area.
According to claim 2,
The substrate further includes a first pixel area adjacent to the white pixel area along a first direction,
An organic light emitting display device wherein a first color filter is located in the light emitting area of the first pixel area.
According to claim 3,
In the non-emission area between the white pixel area and the first pixel area, the overcoat layer has a depression, and the second electrode is located in the depression.
According to claim 4,
Further comprising a bank located in the non-emission area and covering an edge of the first electrode,
The bank is an organic light emitting display device exposing the depression.
According to claim 4,
In the depression, the second electrode is positioned between the first color filter and the blue color filter pattern.
According to claim 6,
The organic light emitting display device wherein the first pixel area is a red pixel area, and the first color filter is a red color filter.
According to claim 4,
The organic light emitting display device further includes a metal wire located between the substrate and the overcoat layer, wherein the metal wire overlaps the depression.
According to claim 3,
The first pixel area is a blue pixel area, and the first color filter is a blue color filter,
The organic light emitting display device wherein the blue color filter pattern extends from the first color filter.
According to clause 9,
The micro lens is provided in the non-emission area between the white pixel area and the first pixel area to correspond to the blue color filter pattern.
According to claim 10,
The organic light emitting display device wherein the micro lens has a first aspect ratio in the non-emission area of the white pixel area and a second aspect ratio smaller than the first aspect ratio in the light emitting area of the white pixel area.
According to clause 9,
The organic light emitting display device wherein the blue color filter pattern corresponds to at least two sides of the light emitting area of the white pixel area.
According to clause 9,
The substrate further includes a second pixel area adjacent to the first pixel area in a direction opposite to the white pixel area,
The micro lens provided in the second pixel area corresponds to the light emitting area of the second pixel area, and the micro lens provided in the white pixel area corresponds to both the light emitting area and the non-light emitting area of the white pixel area. Organic light emitting display device.
According to claim 13,
Further comprising a bank located in the non-emission area and having an opening corresponding to the light emitting area,
In the second pixel area, the area of the opening is equal to the area of the micro lens,
In the white pixel area, an area of the opening is smaller than an area of the micro lens.
According to claim 13,
Further comprising a bank located in the non-emission area and having an opening corresponding to the light emitting area,
In a non-emission area between the white pixel area and the first pixel area, the bank has a concave-convex surface,
The bank has a flat surface in a non-emission area between the first pixel area and the second pixel area.
According to claim 13,
At least one of the overcoat layer, the organic light-emitting layer, and the second electrode has a convex-convex surface in a non-emission area between the white pixel area and the first pixel area, and the ratio between the first pixel area and the second pixel area is An organic light emitting display device having a flat surface in the light emitting area.
According to claim 1,
The organic light emitting display device wherein the micro lens has a first aspect ratio in the first area and a second aspect ratio that is smaller than the first aspect ratio in the second area excluding the first area.
According to claim 1,
The organic light emitting display device wherein the first area extends from the center of the white pixel area across the white pixel area.
According to claim 18,
Further comprising a blue color filter located in a second pixel area adjacent to the white pixel area,
The organic light emitting display device wherein the blue color filter pattern extends from the blue color filter.