KR20190038320A - Organic light emitting diode display device - Google Patents

Abstract

According to the present invention, provided is an organic light emitting display device comprising: a substrate including a white pixel region; a blue color filter pattern located in a first region of the white pixel region; an overcoat layer covering the blue color filter pattern and having a microlens; a first electrode located on the overcoat layer; an organic light emitting layer covering the first electrode; and a second electrode covering the organic light emitting layer. An objective of the present invention is to provide an organic light emitting display device having an improved light extraction efficiency.

Description

[0001] The present invention relates to an organic light emitting diode display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an organic light emitting display, and more particularly, to an organic light emitting display having improved light extraction efficiency and color temperature.

Recently, as the society has become a full-fledged information age, interest in information display processing and displaying a large amount of information has increased, and a demand for using portable information media has increased, and the display field has rapidly developed And various lightweight and thin flat panel display devices have been developed in response to this.

Specific examples of such flat panel display devices include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display (FED) (OLED) display device, and the like. These flat panel display devices have excellent performance in reducing thickness, weight, and power consumption, Cathode Ray Tube (CRT).

Of the above flat panel display devices, the organic light emitting display device is a self-luminous display device, and since it does not require a backlight used in a liquid crystal display device that is a non-light emitting device, it can be lightweight and thin.

In addition, it has a better viewing angle and contrast ratio than liquid crystal display devices, is advantageous in terms of power consumption, can be driven by DC low voltage, has a fast response speed, is resistant to external impacts due to its solid internal components, It has advantages.

Particularly, since the manufacturing process is simple, it is advantageous in that the production cost can be saved more than the conventional liquid crystal display device.

However, such OLEDs are largely lost in the process of emitting light emitted from the organic light emitting layer through the various components of the organic light emitting display device, and the light emitted to the outside of the organic light emitting display device is emitted from the organic light emitting display It is only about 20% of light.

Here, since the amount of light emitted from the organic light emitting layer increases along with the amount of current applied to the organic light emitting display, it is possible to increase the brightness of the organic light emitting display by applying more current to the organic light emitting layer, The consumption is increased, and the lifetime of the organic light emitting display device is also reduced.

Therefore, in recent years, in order to improve the light extraction efficiency of the organic light emitting display, a micro lens array (MLA) is attached to the outside of the substrate of the organic light emitting display, or a microlens is formed in the overcoat layer of the organic light emitting display Is proposed.

However, in the case of an organic light emitting diode display provided with a microlens, the color temperature is lowered and the display quality is lowered.

SUMMARY OF THE INVENTION It is a first object of the present invention to improve the color temperature of an organic light emitting diode display having improved light extraction efficiency.

It is a third object of the present invention to achieve a high quality color through the above process, and to improve the efficiency of the OLED display by improving the lifetime of the OLED display.

In order to achieve the above object, the present invention provides a liquid crystal display comprising: a substrate including a white pixel region; A blue color filter pattern located in a first region of the white pixel region; An overcoat layer covering the blue color filter pattern and having a microlens; A first electrode positioned on the overcoat layer; An organic light emitting layer covering the first electrode; And a second electrode covering the organic light emitting layer.

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

In the organic light emitting diode display of the present invention, the substrate may further include a first pixel region adjacent to the white pixel region along a first direction, and the first color filter may be disposed in the light emitting region of the first pixel region, do.

In the organic light emitting diode display of the present invention, in the non-luminescent region between the white pixel region and the first pixel region, the overcoat layer has a depressed portion, and the second electrode is located in the depressed portion.

The organic light emitting diode display of the present invention further includes a bank which is located in the non-emission region and covers an edge of the first electrode, and the bank exposes the depression.

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

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

In the organic light emitting diode display of the present invention, the first pixel region is a blue pixel region, 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 diode display of the present invention, the microlens is provided in the non-emission region between the white pixel region and the first pixel region and corresponds to the blue color filter pattern.

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

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

In the organic light emitting diode display of the present invention, the substrate may further include a second pixel region adjacent to the first pixel region in a direction opposite to the white pixel region, And the microlenses provided in the white pixel region correspond to both the light emitting region and the non-light emitting region of the white pixel region.

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

The organic light emitting display of the present invention further comprises a bank which is located in the non-emission region and has an opening corresponding to the emission region, wherein in the non-emission region between the white pixel region and the first pixel region, And the bank has a flat surface in a non-emission region between the first pixel region and the second pixel region.

At least one of the overcoat layer, the organic light emitting layer, and the second electrode may have a concavo-convex surface in the non-emission region between the white pixel region and the first pixel region, And a flat surface in the non-emission region between the region and the second pixel region.

In the organic light emitting diode display of the present invention, the microlens has a first aspect ratio in the first region and a second aspect ratio in the second region excluding the first region, the second aspect ratio being smaller than the first aspect ratio.

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

The organic light emitting display of the present invention may further comprise a blue color filter located in a second pixel region adjacent to the white pixel region, wherein the blue color filter pattern extends from the blue color filter.

The organic light emitting diode display of the present invention has an effect of improving light extraction efficiency by providing a microlens.

In addition, by providing the depressions in the overcoat layer corresponding to the non-light emitting regions, it is possible to minimize the occurrence of light leakage due to the light emitted from the adjacent pixel regions, and to extract light traveling to the adjacent pixel regions to the outside of the substrate So that the light extraction efficiency is further improved.

Further, the provision of the blue color filter pattern in the non-light emitting region or the light emitting region of the white pixel region has the effect of improving the color temperature of the organic light emitting display device.

As a result, high-quality color can be realized.

1 is a schematic plan view of a pixel of an OLED display according to a first embodiment of the present invention.
2 is a cross-sectional view taken along the line I-I of FIG. 1, and is a schematic cross-sectional view of a part of an organic light emitting diode display according to a first embodiment of the present invention.
3 is a graph showing a spectrum in a light emitting diode including a microlens.
FIG. 4 is a schematic view illustrating a light guide of an OLED display according to an exemplary embodiment of the present invention. Referring to FIG.
5 is a schematic plan view of a pixel of an OLED display according to a second embodiment of the present invention.
6 is a cross-sectional view taken along line VI-VI in Fig.
7A and 7B are photographs of light emission with and without a microlens.
8 is a graph showing the ratio of external light reflection in each pixel region of the organic light emitting display device when a microlens is applied.
9 is a schematic plan view of a pixel of an OLED display according to a third embodiment of the present invention.
10 is a schematic plan view of a pixel of an OLED display according to a fourth embodiment of the present invention.
11 is a cross-sectional view taken along line XI-XI in Fig.
12 is a graph showing changes in luminance and color temperature due to the blue color filter pattern in the white pixel region.

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

1 is a schematic plan view of a pixel of an organic light emitting diode display according to an embodiment of the present invention.

2, a pixel P includes red, white, blue, and green pixel regions R-SP, W-SP, (R-SP, W-SP, B-SP, G-SP) includes a light emitting region EA. A bank 119 is disposed along the edge of the light emitting region EA to form a non-light emitting region NEA.

In FIG. 1, the pixel regions R-SP, W-SP, B-SP, and G-SP have the same width. Alternatively, the pixel regions R-SP, W-SP, B-SP, and G-SP may have different widths.

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

(R), white (W), blue (B), and green (G) light emit in the light emitting region EA of each pixel region (R-SP, W-SP, B- For this purpose, red, blue and green color filters 106a (red), blue (green), and blue (green) are respectively added to the respective light emitting regions EA of the red, And blue light emitted from the organic light-emitting layer 113 (see FIG. 2) is directly transmitted through the white pixel region W-SP.

A plurality of microlenses 117 (or a microlens array MLA) is disposed in each light emitting region EA. The shapes of the microlenses 117 disposed in the respective light emitting regions EA may be the same. The microlens 117 serves to improve the external light extraction efficiency of the organic light emitting layer 113 (see FIG. 2).

The microlens 117 is formed by alternately arranging 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 .

At least one depression 108a is provided in the non-emission region NEA between the neighboring pixel regions R-SP, W-SP, B-SP and G-SP, SP, B-SP, and G-SP) is reflected by metal wiring (not shown) to minimize light leakage.

The depression 108a may be disposed along one edge of the light emitting region EA between adjacent pixel regions R-SP, W-SP, B-SP, and G-SP, Do not. For example, the depressed portion 108a may be disposed on at least one of the upper or lower portion of the light emitting region EA in a planar manner, or may be disposed in at least one region of the left or right side of the light emitting region EA.

Particularly, the light leakage generated by the light generated from the neighboring pixel regions (R-SP, W-SP, B-SP, G-SP) It is preferable that the depressed portion 108a is positioned on the left and right sides of the light emitting region EA in a plan view since the light is more strongly viewed between the regions R-SP, W-SP, B-SP and G-SP.

In the organic light emitting diode display 100 according to the embodiment of the present invention, a blue color (not shown) is formed on the non-emission region NEA along the edge of the emission region EA of the white pixel region W- And the filter pattern 200 is disposed.

As a result, light leakage corresponding to blue is generated in the white pixel region W-SP, thereby improving the color temperature of the OLED display 100 (see FIG. 2).

Therefore, a higher quality color can be realized. This will be described in more detail with reference to FIG.

FIG. 2 is a cross-sectional view taken along the line I-I of FIG. 1, and is a schematic cross-sectional view of a part of an organic light emitting diode display according to an embodiment of the present invention.

Meanwhile, the OLED display 100 according to the exemplary embodiment of the present invention is divided into a top emission type and a bottom emission type according to a transmission direction of emitted light. The light emitting method will be described as an example.

One pixel (P in FIG. 1) defines four pixel regions (R-SP, W-SP, B-SP and G-SP) (R-SP, W-SP, B-SP, and G-SP) are defined as red, white, blue and green pixel regions.

For convenience of explanation, a light emitting area EA in which a light emitting diode E is provided in each pixel region R-SP, W-SP, B-SP, and G- Emitting region NEA located along the edge of the region EA is defined. The switching region TrA in which the driving thin film transistor DTr in each pixel region R-SP, W-SP, B-SP, and G-SP is formed is defined in the non-emission region NEA.

The organic light emitting diode display 100 according to the embodiment of the present invention includes a substrate 101 on which a driving thin film transistor DTr and a light emitting diode E are formed is encapsulated by a protective film 102 encapsulation.

The semiconductor layer 103 is located on the switching region TrA of each pixel region R-SP, W-SP, B-SP, and G-SP on the substrate 101, 103 is made of polysilicon and its central portion is composed of an active region 103a constituting a channel and source and drain regions 103b and 103c doped with impurities at a high concentration 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 shielding layer (not shown) may be disposed under the semiconductor layer 103.

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

A gate insulating film 105 is disposed on the semiconductor layer 103.

A gate wiring (not shown) extending in one direction with the gate electrode 107 corresponding to the active region 103a of the semiconductor layer 103 is provided above the gate insulating film 105. [

The first interlayer insulating film 107a and the gate insulating film 105 under the first interlayer insulating film 107a are disposed on both sides of the active region 103a, First and second semiconductor layer contact holes 116a and 116b are formed to expose the source and drain regions 103b and 103c, respectively.

Next, upper portions of the first interlayer insulating film 107a including the first and second semiconductor layer contact holes 116a and 116b are separated from each other by a source exposed through the first and second semiconductor layer contact holes 116a and 116b, And source and drain electrodes 110a and 110b which are in contact with the drain regions 103b and 103c, respectively.

The second interlayer insulating film 107b is located above the first interlayer insulating film 107a exposed between the source and drain electrodes 110a and 110b and the two electrodes 110a and 110b.

The semiconductor layer 103 includes source and drain electrodes 110a and 110b and source and drain regions 103b and 103c that are in contact with the electrodes 110a and 110b. The gate insulating film 105 and the gate electrode 107 constitute a driving thin film transistor DTr.

On the other hand, a data line 110c which defines each pixel region (R-SP, W-SP, B-SP, G-SP) crossing the gate wiring (not shown) is located. In addition, a switching thin film transistor (not shown) having substantially the same structure as the driving thin film transistor DTr and connected to the driving thin film transistor DTr is formed.

In FIG. 2, the driving thin film transistor DTr includes a semiconductor layer 103 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 amorphous silicon of pure water and impurities, and may have a bottom gate structure.

The color filters 106a, 106b and 106c corresponding to the light emitting region EA of the red, blue and green pixel regions R-SP, B-SP and G-SP are arranged on the second interlayer insulating film 107b do.

The color filters 106a, 106b and 106c are for converting the color of the white light emitted from the organic light emitting layer 113 and include a red color filter 106a, a blue color filter 106a, ) Color filters 106b are located in the light emitting region EA for each of the red, blue and green pixel regions R-SP, B-SP and G-SP. Each of the color filters 106a, 106b, and 106c may be extended to a part of the non-emission region NEA adjacent to the emission region EA.

Further, a separate color filter is not disposed in the light emitting region EA of the white pixel region W-SP, and the white light emitted from the organic light emitting layer 113 is directly transmitted.

Accordingly, the organic light emitting diode display 100 of the present invention emits R, W, B and G colors for each pixel region (R-SP, W-SP, B-SP, and G- .

The OLED display 100 according to the exemplary embodiment of the present invention includes a blue color filter pattern 200 on a non-emission region NEA located along the edge of the emission region EA of the white pixel region W- ) Is further provided. Accordingly, the OLED display 100 according to the embodiment of the present invention can improve the color temperature.

The overcoat layer 108 having the drain contact hole 117 exposing the drain electrode 110b together with the second interlayer insulating film 107b is formed on the color filters 106a, 106b, and 106c and the blue color filter pattern 200, . A plurality of concave portions 117b and a plurality of convex portions 117a are alternately disposed on the surface of the overcoat layer 108 in the light emitting region EA to form a microlens 117. [

The overcoat layer 108 is made of an insulating material having a refractive index of about 1.5. For example, the overcoat layer 108 may be formed of an acrylic resin, an epoxy resin, a phenol resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polyphenylene resin, a polyphenylene sulfide resin, And photoresist, but is not limited thereto.

The light extraction efficiency of the organic light emitting diode display 100 according to the exemplary embodiment of the present invention is improved through the overcoat layer 108 having the microlens 117.

In the non-emission region NEA between the neighboring pixel regions R-SP, W-SP, B-SP and G-SP, at least one depression 108a is provided on the overcoat layer 108 .

At this time, the depth of the depression 108a may be made 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, and the second interlayer insulating film 107b may be exposed. The depth of the depression 108a may be greater than the height of the overcoat layer 108 so that the depression 108a may be formed in a part of the second interlayer insulating film 107b.

The first electrode 111 connected to the drain electrode 110b of the driving thin film transistor DTr and having a relatively low work function value as an anode of the light emitting diode E is formed on the overcoat layer 108, ).

The first electrode 111 may be formed of a metal oxide such as indium tin oxide (ITO) or indium zinc oxide (IZO), a metal oxide such as ZnO: Al or SnO2: Sb A conductive polymer such as poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDT), polypyrrole and polyaniline. In addition, a carbon nanotube (CNT), a graphene, a silver nano wire, or the like may be used.

The first electrode 111 is located for each of the pixel regions R-SP, W-SP, B-SP, and G- A bank 119 is positioned between the first electrodes 111 located in the first electrodes 111 and the second electrodes 111. [ That is, the bank 119 is located at the boundary between the pixel regions R-SP, W-SP, B-SP, and G-SP and covers the edges of the first electrode 111.

At this time, in the non-emission region NEA between the neighboring pixel regions R-SP, W-SP, B-SP and G-SP, the bank 119 is located only on the overcoat layer 108, 108 are exposed.

An overcoat overcoat and an organic light emitting layer 113 are disposed on the first electrode 111 including the bank 119. The organic light emitting layer 113 may be a single layer made of a light emitting material, A hole injection layer, a hole transport layer, an emitting material layer, an electron transport layer, and an electron injection layer. have.

A second electrode 115, which forms a cathode, is disposed on the entire surface of the organic light emitting layer 113.

The second electrode 115 may be made of a material having a relatively low work function value. At this time, the second electrode 115 may be formed of a single layer of an alloy composed of a first metal made of Ag or the like having a low work function and a second metal made of Mg or the like, or a first layer of a metal, Gt; layered < / RTI >

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 diode display 100 displays the holes injected from the first electrode 111 and the holes injected from the second electrode 115 Is transported to the organic light emitting layer 113 to form an exciton. When the exciton transitions 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 exits to the outside, so that the OLED display 100 realizes an arbitrary image.

Here, the first electrode 111, the organic light emitting layer 113, and the second electrode 115 sequentially located on the overcoat layer 108 include concave portions 117b formed on the surface of the overcoat layer 108, The microlenses 117 are formed along the convex portions 117a.

The organic light emitting layer 113 and the second electrode 115 may be extended to the non-emitting region NEA. In this case, the organic light emitting layer 113 and the second electrode 115 may be connected to the adjacent pixel region R- Emitting region NEA between the overcoat layer 108 and the depression 108a of the overcoat layer 108 disposed between the non-emission regions NEA, SP, W-SP, B-SP and G-

Therefore, the light leakage generated by reflection from the adjacent pixel regions R-SP, W-SP, B-SP, and G-SP can be minimized.

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 so that the organic light emitting display 100 can be encapsulated encapsulation.

Here, the protective film 102 prevents external oxygen and moisture from penetrating into the OLED display 100. For example, the protective film 102 may include first and second inorganic insulating films and an organic insulating film sandwiched therebetween to complement the impact resistance of the first and second inorganic insulating films.

In the structure in which the organic protective film and the first and second inorganic insulating films are alternately repeatedly laminated, moisture and oxygen must be prevented from penetrating through the side surface of the organic insulating film. Therefore, It is preferable that the upper surface and the side surface are entirely enclosed.

Accordingly, the OLED display 100 can prevent moisture and oxygen from penetrating into the OLED display 100 from the outside.

In the organic light emitting diode display 100 according to the embodiment of the present invention, the polarizer 120 is disposed on the outer surface of the substrate 101 through which the light is transmitted, to prevent a decrease in contrast due to external light.

That is, when the organic light emitting diode display 100 is in the driving mode for realizing an image, by positioning the polarizing plate 120 for blocking external light incident from the outside in the transmission direction of the light emitted through the organic light emitting layer 113, .

The polarizing plate 120 may be a circularly polarizing plate for shielding external light, and may include a retardation plate (not shown) and a linear polarizing plate (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 linearly polarizing plate.

위상지연값을 갖는 4분의 1파장판(quarter wave plate : QWP)일 수 있으며, 선편광판(미도시)은 편광축을 가지며 편광축 방향으로 광을 선편광시킨다. The retarder (not shown)

A quarter wave plate (QWP) having a phase retardation value, and a linear polarizer (not shown) has a polarization axis and linearly polarizes the light in the polarization axis direction.

Accordingly, the organic light emitting diode display 100 according to the embodiment of the present invention can minimize the reflection of external light through the polarizer 120, thereby preventing a decrease in contrast.

As described above, the organic light emitting display 100 according to the embodiment of the present invention is formed by forming the surface of the overcoat layer 108 with the concave portion 117b and the microlens 117 of the convex portion 117a, Thereby improving the efficiency.

That is, the light that is trapped while being continuously totally reflected in the organic light emitting layer 113 and the second electrode 115 in the light emitted from the organic light emitting layer 113 is totally reflected by the micro lens 117 of the second electrode 115, And the external light emitting efficiency is increased through multiple reflections. Accordingly, the light extraction efficiency of the OLED display 100 is improved.

Particularly, by providing the depression 108a in the overcoat layer 108 in correspondence with the non-emission region NEA between the adjacent pixel regions R-SP, W-SP, B-SP and G- It is possible to minimize the occurrence of light leakage due to light emitted from the light emitting region EA of the pixel regions R-SP, W-SP, B-SP, and G-SP.

That is, in the organic light emitting display device having a microlens, a portion of the light emitted from the organic light emitting layer and directed toward the substrate is reflected by a metal wiring such as a data wiring provided on the substrate and reaches a microlens And light leakage occurs.

However, in the OLED display 100 of the present invention, the overcoat layer 108 includes the depression 108a and the second electrode 115 is disposed at the depression 108a, thereby preventing or minimizing the light leakage . That is, even if the light generated from the organic light emitting layer 113 is reflected by the metal wiring, light is emitted to the non-emission region NEA of the neighboring pixel regions R-SP, W-SP, B-SP and G- SP is reflected or reflected by the second electrode 115 in the depression 108a located in the vicinity of the pixel region R-SP, W-SP, B-SP, G-SP.

In more detail, the chromaticity of the light source or reference white can generally be expressed as the temperature of the nearest region on the radiation curve instead of the coordinates on the two-dimensional color chart. This is called Correlated Color Temperature (CCT) or color temperature.

The color temperature is used as a numerical value indicating the degree to which the white color is close to what color. When the display device displays a color, the color temperature is high when the color is close to blue color, and the color temperature is low when it is close to yellow color.

The higher the color temperature, the higher the quality of color.

Particularly, it is preferable that a display device for displaying an image using a light emitting diode (E) emitting white light has a high color temperature of white in order to express high-quality hue.

On the other hand, the microlens 117 is implemented in the light emitting diode E by the overcoat layer 108 having a roughened surface, thereby improving the light efficiency of the organic light emitting display 100. However, the light efficiency improvement by the microlens 117 occurs more in the yellowish green light than in the blue light.

3, which is a graph showing a spectrum in a light emitting diode including a microlens, the intensity of light (light intensity) in a light emitting diode (MLA) including a microlens, as compared with a light emitting diode Ref that does not include a microlens I.e., luminance) increases. At this time, the increase in luminance at the yellow-green wavelength is larger than that at the blue wavelength, so that the color temperature in the white pixel region (W-SP) is lowered.

The contribution of the blue pixel region B-SP can be increased by driving the blue pixel region B-SP in order to compensate for the decrease in the color temperature caused by the microlenses. However, since the element efficiency of the blue pixel region B-SP is lower than that of the other red and green pixel regions R-SP and G-SP, the power consumption of the blue pixel region B-SP is raised do.

The blue pixel region (B-SP) in which the power consumption is increased shortens the lifetime of the light emitting diode (E), and the efficiency of the panel is finally reduced.

On the other hand, in the organic light emitting diode display 100 according to the embodiment of the present invention, the non-emission region NEA located along the edge of the emission region EA of the white pixel region W- The light leakage from the pixel region adjacent to the white pixel region W-SP, for example, the red pixel region R-SP, is prevented from entering the white pixel region 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, the light leakage from the white pixel area W-SP is bluishly converted. The decrease in color temperature due to the light leakage from the adjacent pixel region by the portion 108a is prevented and the decrease in the color temperature by the microlens 117 is prevented by the dimple 108a and the blue color filter pattern 200. [

The organic light emitting diode display 100 according to the embodiment of the present invention increases the contribution of the blue pixel region B-SP without driving the blue pixel region B-SP in order to improve the color temperature of white light Thereby improving the color temperature of the organic light emitting diode display 100. [

Accordingly, the organic light emitting diode display 100 according to the embodiment of the present invention realizes white light having a high color temperature, and is advantageous in expressing high-quality color through it.

Also, since the contribution of the blue pixel region B-SP is not increased in order to improve the color temperature, it is possible to prevent the power consumption of the blue pixel region B-SP from increasing, E can be shortened and the efficiency of the panel can be reduced.

FIG. 4 is a schematic view illustrating a light guide of an OLED display according to an exemplary embodiment of the present invention. Referring to FIG.

As shown in the figure, a red pixel region R-SP and a white pixel region W-SP are arranged adjacent to each other with a data line 110c interposed therebetween on a substrate 102. A red pixel region R- Emitting region EA of the white pixel region W-SP with the red color filter 106a located above the second interlayer insulating film 107b of the light emitting region EA of the white pixel region W- The blue color filter pattern 200 is located above the second interlayer insulating film 107b on the NEA.

An overcoat layer 108 is disposed on the red color filter 106a and the blue color filter pattern 200. The overcoat layer 108 is formed on the light emitting area EA of the pixel areas R-SP and W- And a microlens 117 including a plurality of convex portions 117a and a plurality of concave portions 117b corresponding to the pixel regions R-SP and W-SP, A depression 108a is provided.

The blue color filter pattern 200 located in the non-emission region NEA covering the edge of the light emitting region EA of the white pixel region W-SP has the white pixel region W-SP and the red pixel region R- SP between the depression 108a provided in the non-emission area NEA and the emission area EA of the white pixel area W-SP.

The first electrode 111 is provided for each pixel region R-SP and W-SP on the overcoat layer 108 corresponding to the light emitting region EA, The light emitting layer 113 and the second electrode 115 are sequentially stacked to form a light emitting diode E.

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

The substrate 101 on which such a light emitting diode is formed is encapsulated by the protective film 102.

At this time, in the process that the light emitted from the organic light emitting layer 113 of the red pixel region R-SP passes through the red color filter 106a and the substrate 101 and is emitted to the outside, And then travels toward the white pixel region W-SP. At this time, the light L1 traveling toward the white pixel region W-SP is reflected again by the second electrode 115 covering the depression 108a provided in the overcoat layer 108, so that the red pixel region R -SP) and is reflected by the microlens 117 to be emitted to the outside.

Accordingly, it is possible to prevent the light leakage generated due to the light emitted from the red pixel region (R-SP) from being reflected by the white pixel region (W-SP). In particular, The light extraction efficiency of the organic light emitting display (100 of FIG. 2) is further improved.

The light leakage L2 in the red pixel region R-SP is blocked by the blue color filter pattern 200 after passing through the red color filter 106a to be incident on the white pixel region W-SP Is prevented. Therefore, a decrease in the color temperature of the white pixel region (W-SP) caused by light leakage in the red pixel region (R-SP) is prevented.

Part of the light emitted from the organic light emitting layer 113 is also reflected by the data line 110c and directed toward the adjacent pixel region, for example, the red pixel region R-SP, even in the white pixel region W- The light L3 traveling toward the red pixel region R-SP is reflected again by the second electrode 115 in the depression 108a provided in the overcoat layer 108, W-SP), and is reflected by the microlens 117 to be emitted to the outside.

Accordingly, it is possible to prevent the light leakage generated due to the light emitted from the white pixel region (W-SP) from being reflected to the red pixel region (R-SP). In particular, And is emitted to the outside, so that the light extraction efficiency of the OLED display 100 (FIG. 2) is further improved.

The light reflected again into the white pixel area W-SP is transmitted through the blue color filter pattern 200 provided in the non-emission area NEA, and the color temperature of the OLED display 100 .

2) of the overcoat layer 108 is formed by the concave portion 117b and the microlens 117 of the convex portion 117a, as described above, Thereby improving the light extraction efficiency.

The provision of the depression 108a in the overcoat layer 108 corresponds to the non-emission area NEA between the neighboring pixel areas R-SP and W-SP, It is possible to minimize the occurrence of light leakage due to the light emitted from the light emitting region EA of the pixel region RSP and to cause the light traveling to the adjacent pixel regions R-SP and W-SP to be extracted outside the substrate 101 So that the light extraction efficiency is further improved.

Particularly, by providing the blue color filter pattern 200 on the non-emission region NEA along the edge of the emission region EA of the white pixel region W-SP, the red color filter pattern 200 adjacent to the white pixel region W- The light leakage from the pixel region R-SP to the white pixel region W-SP is blocked and the light leakage from the white pixel region W-SP is shifted in blue, thereby improving the color temperature.

Therefore, the OLED display 100 according to the embodiment of the present invention realizes white light having a high color temperature, and is advantageous for expressing high-quality color through the white light.

Particularly, since the light leakage reflected from the red pixel region (R-SP) is used to improve the color temperature, the problem caused by the light leakage can be solved, and a higher quality color can be realized.

Further, since the contribution of the blue pixel region (B-SP in Fig. 2) is not increased in order to improve the color temperature, it is possible to prevent the power consumption of the blue pixel region (B-SP in Fig. 2) , Thereby reducing the lifetime 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 OLED display according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along a line VI-VI in FIG.

5 and 6, in the organic light emitting diode display 300 according to the second embodiment of the present invention, the red (R), white (G), and blue (G) (R-SP, W-SP, B-SP, and G-SP) constitute one pixel.

Each of the pixel regions R-SP, W-SP, B-SP and G-SP includes a non-luminescent region NEA in which the bank 319 is arranged and a luminescent region 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 region EA.

The driving thin film transistor DTr is provided on the non-emission region NEA of each pixel region R-SP, W-SP, B-SP, and 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 together 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 to cover the gate electrode 107. [ A source electrode 110a and a drain electrode 110b are formed on the first interlayer insulating film 307a and are in contact with both ends of the semiconductor layer 103 (the source region 103b and the drain region 103c) .

A gate wiring 302 extends along the first direction on the gate insulating film 305 and a data wiring 310c extends along the second direction on the first interlayer insulating film 307a. W-SP, B-SP, and G-SP) are defined by intersecting the gate wirings 302 and the data wirings 310c.

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

The red and green color filters 106a and 106c have substantially the same area as the light emitting region EA of the red and green pixel regions R-SP and G-SP. On the other hand, since the blue color filter 306b extends to form the blue color filter pattern 330, the area of the blue color filter 306b including the blue color filter pattern 330 is the same as the area of the blue color filter area 306b Is larger than the light emitting area (EA) area.

On the other hand, 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 line 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 a uneven surface. In other words, a plurality of concave portions 317b and a plurality of convex portions 317a are alternately disposed on the surface of the overcoat layer 308, thereby forming a microlens 317. [

In the red and green pixel regions R-SP and G-SP, the microlenses 317 have substantially the same area as the luminescent region EA. That is, in the red and green pixel regions R-SP and G-SP, the microlens 317 has substantially the same area as the red and green color filters 306a and 306c.

On the other hand, in the white and blue pixel regions W-SP and B-SP, the microlens 317 has an area larger than the light emitting region EA. That is, the microlenses 317 of the white pixel region W-SP and / or the microlenses 317 of the blue pixel region B-SP are arranged between the white and blue pixel regions W-SP and B- Emitting region NEA.

Emitting region NEA between the red pixel region R-SP and the white pixel region W-SP and / or between the blue pixel region B-SP and the green pixel region G-SP, The overcoat layer 308 has a flat surface and the overcoat layer 308 in the non-emission area NEA between the white pixel area W-SP and the blue pixel area B- 317).

The overcoat layer 308 is made of an insulating material having a refractive index of about 1.5. For example, the overcoat layer 308 may be formed of an acrylic resin, an epoxy resin, a phenol resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polyphenylene resin, a polyphenylene sulfide resin, And a 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 region B-SP and the white pixel region W-SP, the second electrode 315 is connected to the blue color filter 306b And the blue color filter pattern 330 of the white pixel region W-SP.

The first electrode 311 is positioned on each of the pixel regions R-SP, W-SP, B-SP, and G-SP on the overcoat layer 308. 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 having 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 region NEA. That is, the bank 319 has an opening for exposing the first electrode 311, and an opening is formed in the light emitting region EA in each of the pixel regions R-SP, W-SP, B-SP, and G- Respectively. In other words, the bank 319 is formed on the overcoat layer 308 surrounding the light emitting area EA.

As described above, the overcoat layer 308 has a flat surface in the non-emission region NEA between the red pixel region R-SP and the white pixel region W-SP, and the white pixel region W- Emitting region NEA between the blue pixel region B-SP and the blue pixel region B-SP.

Therefore, the bank 319 is divided into the first bank 319a and the white pixel region W-SP having a flat surface in the non-emission region NEA between the red pixel region R-SP and the white pixel region W- Emitting region NEA between the first pixel region SP and the blue pixel region B-SP. 6, the irregular surface of the second bank 319b has a higher flatness than the irregular surface of the overcoat layer 308. [ That is, the surface of the concavity and convexity of the second bank 319b has a shape different from that of the 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 concavo-convex shape of the second bank 319b may be different from the concavo-convex shape of the overcoat layer 308. [

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

The organic light emitting layer 313 is formed to cover the bank 319 and the first electrode 311. That is, the organic light emitting layer 313 contacts the first electrode 311 in the light emitting region EA and contacts the bank 319 in the non-light emitting region NEA.

The organic light emitting layer 313 is formed on the entire display area including the red, white, blue and green pixel regions 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 having 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.

The concave portions 317b and the convex portions 317a are formed on the surface of the overcoat layer 308 in the first electrode 311, the organic light emitting layer 313 and the second electrode 315 in the light emitting region EA. A microlens 317 is implemented according to the shape.

In the non-emission region NEA between the white pixel region W-SP and the blue pixel region B-SP, the organic light-emitting layer 313 and the second electrode 315 are formed in the overcoat layer 308 and / The microlenses 117 are formed according to the shapes of the concave portions 117b and the convex portions 117a provided on the surface of the two banks 319b.

That is, in the white pixel region W-SP, the microlens 317 corresponds to both the light emitting region EA and the non-light emitting region NEA. On the other hand, for example, in the green pixel region G-SP, the microlens 317 corresponds to the light emitting region EA except for the non-light emitting region NEA.

The microlens 317 is provided in the non-emission region NEA between the white pixel region W-SP and the blue pixel region B-SP to correspond to the blue color filter pattern 330. [

In the present invention, since the microlenses 317 are provided in the non-emission region NEA between the white pixel region W-SP and the blue pixel region B-SP, ) Is smaller than the area of the microlens 317. [ On the other hand, for example, since the microlens 317 is formed only in the light emitting region EA in the green pixel region W-SP, the opening area of the bank 319 in the green pixel region G- 317, respectively.

A protective film (102 in FIG. 2) in the form of a thin film is formed on the light emitting diode E so that the organic light emitting display 300 can be encapsulated through the protective film 102. In addition, a polarizing plate (120 in Fig. 2) for preventing external light reflection may be placed on the outer surface of the substrate 301. [

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, And a charge generating layer located between the first and second light emitting stacks.

Between the light emitting diode E and the substrate 301, red, blue, and green color filters 306a, 306b, and 306c corresponding to the red, blue, and green pixel regions R-SP, B- Located. Thus, the white light from the light emitting diode E passes through the red, blue, and green color filters 306a, 306b, and 306c, and passes through the red, blue, and green pixel regions R- ), Red, blue, and green light are displayed.

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

As described with reference to FIG. 3, the color temperature of the white pixel region (W-SP) is lowered by the microlenses.

Referring to FIGS. 7A and 7B, which are luminescent images according to presence or absence of a microlens, light is emitted only in a light emitting region in a pixel region of a light emitting diode not including a microlens (FIG. 7A) Light blurring occurs in the non-light emitting region in the pixel region of the light emitting diode having the microlens in the region.

As described above, in the organic light emitting diode display 300 according to the present invention, the light efficiency is improved by the microlens 317, and the microlenses 317 are provided in the non-emission region NEA of the white pixel region W- And the blue color filter pattern 330 are formed, the blue component is increased by using the amplified light. That is, the light emitted from the light emitting diode E of the white pixel region W-SP passes through the blue color filter pattern 330 by the microlenses 317 in the non-emission region NEA, Lt; / RTI > Light emitted from the light emitting diode E of the white pixel region W-SP is reflected by the gate insulating film 305 or the substrate 301 and is incident on the microlens 317 of the non-emission region NEA And may be transmitted through the blue color filter pattern 330 and toward the substrate 301.

Therefore, a decrease in color temperature in the white pixel area W-SP by the microlens 317 is prevented or minimized.

For example, in the green pixel region G-SP, the microlenses 317 are formed only in the light-emitting region EA. In contrast, when the microlens 317 of the green pixel region G-SP extends to the non-emission region EA, the display quality is degraded.

On the other hand, when a microlens is provided, reflection of external light increases. This external light reflection has different intensity for each pixel region.

That is, referring to FIG. 8, which is a graph showing the ratio of external light reflection in each pixel region of the organic light emitting display device when a microlens is applied, the ratio in the red and green pixel regions is smaller than the white pixel region and larger than the blue pixel region . (Measured using DMS-803 equipment) In particular, the reflectance (AR) ratio in the white pixel region is very large. That is, the amount of external light reflection by the microlens is greatly increased in the white pixel region without the color filter, and the reflection of external light is reduced by the blue color filter.

As described above, in the organic light emitting diode display 300 of the present invention, the microlens 317 is disposed between the white pixel region W-SP and the blue pixel region B-SP as well as the light emitting region EA. (NEA), so that the problem of increased reflection of external light by the microlenses 317 may occur. However, the increase in external light reflection due to the expansion of the microlens 317 is minimized by the blue color filter pattern 330 in the non-emission region NEA between the white pixel region W-SP and the blue pixel region B- do.

Therefore, in the OLED display 300 of the present invention, the light efficiency is improved by the structure of the microlens 317, and the microlenses 317 and 317 are formed in the non-emission region NEA of the white pixel region W- The blue color filter 306b is expanded so that the color temperature reduction by the microlenses 317 and the reflection of external light are prevented or minimized.

9 is a schematic plan view of a pixel of an OLED display according to a third embodiment of the present invention.

9, in the OLED display 300 according to the third embodiment of the present invention, the red, white, blue, and green pixel regions R- SP, W-SP, B-SP, and G-SP) constitute one pixel.

The gate lines 302 extending along the first direction and the data lines 310c extending along the second direction cross each other to define the pixel regions R-SP, W-SP, B-SP and G-SP. Emitting region EA surrounding the emission region EA and a non-emission region NEA surrounding the emission region EA are provided in each of the pixel regions R-SP, W-SP, B-SP, and G-

In the white pixel region W-SP, the non-emission region NEA includes a first non-emission region NEA1 located between the white pixel region W-SP and the blue pixel region B-SP, The second and third non-emission regions NEA2 and NEA3 extending from the non-emission region NEA1 to the upper side and the lower side of the white pixel region W-SP along the first direction, and the second and third non- NEA2, NEA3) of the first non-emission region NEA4. That is, the fourth non-emission region NEA4 is located between the white pixel region W-SP and the red pixel region R-SP. Alternatively, when the green pixel region G-SP is located adjacent to the white pixel region W-SP, the fourth non-emission region NEA4 may include a white pixel region W-SP and a green pixel region G -SP). The blue color filter pattern 330 may extend in the first direction (horizontal direction) from the blue color filter 306b toward the white pixel region W-SP. Alternatively, the blue color filter pattern 330 may be spaced apart from the blue color filter 306b.

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

4, in the OLED display of the third embodiment, the blue color filter pattern 330 is formed corresponding to the three sides of the white pixel region W-SP do.

Alternatively, 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 region NEA4 of the white pixel region W-SP. That is, the blue color filter pattern 330 may correspond to at least two sides of the light emitting region EA of the white pixel region W-SP.

Although not shown, the organic light emitting display 300 includes a microlens (317 in FIG. 6), and the microlens 317 has a ratio between the white pixel region W-SP and the blue pixel region B- Emitting region NEA2 and NEA3 of the light-emitting region and the white pixel region W-SP to correspond to the blue color filter pattern 330. [

As described above, in the organic light emitting diode display 300 of the present invention, the light efficiency is improved by the structure of the microlens 317 and the microlenses 317 are formed in the non-emission region NEA of the white pixel region W- 317 and the blue color filter 306b are expanded to prevent or minimize the color temperature drop and the external light reflection by the microlens 317. [

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

10 and 11, in the organic light emitting diode display 400 according to the fourth embodiment of the present invention, red, white, blue, and green pixel regions (R-SP, W-SP, B-SP, and G-SP) constitute one pixel.

The pixel regions R-SP, W-SP, B-SP, and G-SP have the light emitting regions EA surrounded by the non-light emitting regions NEA and the banks 319 in which the banks . 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 region EA.

The driving thin film transistor DTr is provided on the non-emission region NEA of each pixel region R-SP, W-SP, B-SP, and 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 FIGS. 10 and 11 together with FIG. 2, a semiconductor layer 103 is formed on a 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 with the semiconductor layer 103 is formed on the gate insulating film 405 and a first interlayer insulating film 407a is formed to cover the gate electrode 107. [ A source electrode 110a and a drain electrode 110b are formed on the first interlayer insulating film 407a to be in contact with both ends of the semiconductor layer 103 (the source region 103b and the drain region 103c) .

A gate wiring 402 extends along the first direction on the gate insulating film 405 and a data wiring 410c extends along the second direction on the first interlayer insulating film 407a. The gate wirings 402 and the data wirings 410c intersect each other to define the pixel regions R-SP, W-SP, B-SP, and 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. Further, a blue color filter pattern 430 is formed in a part of the white pixel region W-SP. For example, the blue color filter pattern 430 may be located at the center of the white pixel region W-SP and may extend from the blue color filter 406b toward the white pixel region W-SP in a first direction ). Alternatively, the blue color filter pattern 430 may be spaced apart from the blue color filter 406b by a certain distance.

On the other hand, the second interlayer insulating film 407b may be omitted. In this case, the red, blue, and green color filters 406a, 406b, and 406c and the 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 a uneven surface. That is, a plurality of concave portions 444 and 454 and a plurality of convex portions 442 and 452 are alternately disposed on the surface of the overcoat layer 408 to form the first and second microlenses 440 and 450. In the white pixel region W-SP, the first microlens 440 corresponds to the blue color filter pattern 430 and the second microlens 450 corresponds to the emission region EA except for the blue color filter pattern 430. [ .

The overcoat layer 408 is made of an insulating material having a refractive index of about 1.5. For example, the overcoat layer 408 may be formed of an acrylic resin, an epoxy resin, a phenol resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polyphenylene resin, a polyphenylene sulfide resin, And a 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 region B-SP and the white pixel region W-SP, the second electrode 415 is connected to the blue color filter 406b of the blue pixel region B- And the blue color filter pattern 430 of the white pixel region W-SP.

The first electrode 411 is positioned on each of the pixel regions R-SP, W-SP, B-SP, and G-SP on the overcoat layer 408. 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 may be formed of a material having a relatively high work function value and may serve as an anode.

The bank 319 covers the edge of the first electrode 411 and is located in the non-emission region NEA. That is, the bank 419 has an opening for exposing the first electrode 411, and an opening is formed in the light emitting region EA in each of the pixel regions R-SP, W-SP, B-SP, and G- Respectively. In other words, the bank 319 is formed on the overcoat layer 408 surrounding the light emitting area EA.

The organic light emitting layer 413 is formed to cover the bank 319 and the first electrode 411. That is, the organic light emitting layer 413 contacts the first electrode 411 in the light emitting region EA and contacts the bank 319 in the non-light emitting region NEA.

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

On the organic light emitting layer 413, a second electrode 415 is formed. The second electrode 415 is made of a material having 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 luminescent region EA, the first electrode 411, the organic light emitting layer 413, and the second electrode 415 are provided with concave portions 444 and 454 and convex portions 452 and 454 in accordance with the surface shape of the overcoat layer 408 442, and 452. First and second microlenses 440 and 450 are implemented.

The first microlens 440 corresponds to the blue color filter pattern 430 and the second microlens 450 corresponds to the blue color filter pattern 430 except for the blue color filter pattern 430. In the white pixel region W- Emitting region EA.

A protective film 102 (see FIG. 2) in the form of a thin film is formed on the light emitting diode E so that the organic light emitting display 400 can be encapsulated through the protective film 102. In addition, a polarizing plate (120 in Fig. 2) for preventing reflection of external light may be positioned on the outer surface of the substrate 401. Fig.

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, And a charge generating layer located between the first and second light emitting stacks.

Between the light emitting diode E and the substrate 410, red, blue, and green color filters 406a, 406b, and 406c correspond to the red, blue, and green pixel regions R-SP, B- Located. Thus, the white light from the light emitting diode E passes through the red, blue, and green color filters 406a, 406b, and 406c, respectively, and passes through the red, ), Red, blue, and green light are displayed.

As described above, the microlenses 440 and 450 are implemented in the light emitting diode E by the overcoat layer 408 having the uneven surface, thereby improving the light efficiency of the OLED display 400. [

However, the light efficiency enhancement by the microlenses 420 and 430 is larger in the yellowish green light than in the blue light.

That is, as described with reference to FIG. 6, the light intensity (that is, brightness) in the light emitting diode MLA including a microlens increases as compared with the light emitting diode Ref that does not include a microlens. At this time, the increase in luminance at the yellow-green wavelength is larger than that at the blue wavelength, so that the color temperature in the white pixel region (W-SP) is lowered.

However, in the OLED display 400 of the present invention, the blue color filter pattern 430 is formed in a part of the white pixel region W-SP, so that the decrease in color temperature by the microlenses 420 and 430 is compensated .

The blue color filter pattern 430 is located at the center of the white pixel region W-SP so that the blue color filter pattern 430 is formed in the light emitting region EA of the white pixel region W- The area of the first electrode 430 is maintained. Therefore, the uniformity of the color temperature improvement by the blue color filter pattern 430 is ensured.

9, the blue color filter pattern 330 is formed in the second and third non-emission regions NEA2 and NEA3 of the white pixel region W-SP, for example, as in the OLED display 300 shown in FIG. The area of the blue color filter pattern 330 is reduced in the white pixel region W-SP to prevent a desired color temperature from being realized.

However, in the OLED display 400 of the present invention, the blue color filter pattern 430 is located at the center of the white pixel region W-SP, so that the light emitting region EA of the white pixel region W- The area of the blue color filter pattern 430 is maintained and the uniformity of the color temperature improvement by the blue color filter pattern 430 is ensured.

On the other hand, the luminance and the color temperature are changed in accordance with the area ratio of the blue color filter pattern 430 formed in the light emitting region EA of the white pixel region W-SP. 12, which is a graph showing changes in luminance and color temperature due to the blue color filter pattern in the white pixel region, the area ratio of the blue color filter pattern 430 to the emission region EA of the white pixel region W- Blue%) increases, the efficiency of the white pixel region W-SP decreases. That is, as the area of the blue color filter pattern 430 increases, the luminance decreases. On the other hand, when the area ratio (Blue%) of the blue color filter pattern 430 to the light emitting 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 light emitting region EA of the white pixel region W-SP have a trade-off relationship.

On the other hand, the external light reflection and the light emission efficiency change depending on the aspect ratio of the convex portion of the microlens. That is, when the aspect ratio of the convex portion of the microlens is relatively large, the external light reflection and the light emission efficiency (light extraction efficiency by the microlens) increase.

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

The first and second microlenses 440 and 450 are provided in the white pixel region W-SP of the OLED display 400 of the present invention, and the first and second microlenses 440 and 450, The first width w1 of the convex portion 442 in the first microlens 440 is smaller than the second width w2 of the convex portion 452 in the second microlens 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 microlenses 440, that is, the aspect ratio (= height / width) of the convex portions 442 is larger than the aspect ratio of the second microlenses 450.

11, the first and second micro lenses 440 and 450 have the same height and different pitches. Alternatively, the first and second microlenses 440 and 450 may have the same pitch and different heights. At this time, the first microlenses 440 have a height larger than that of the second microlenses 450.

Therefore, the first microlens 440 has high reflection efficiency and light extraction efficiency, and the second microlens 450 has low reflection efficiency and light extraction efficiency.

As described above, in the white pixel region W-SP, since the blue color filter pattern 430 is formed corresponding to the first microlenses 440, the external light reflection by the first microlenses 440 is The reflection of the external light is blocked by the blue color filter pattern 430. Therefore, the reflection of the external light does not increase by the first microlens 440. On the other hand, the light extraction efficiency is improved by the first microlens 440, and the luminance reduction by the blue color filter pattern 430 is prevented.

On the other hand, in the region where the blue color filter pattern 430 is not formed in the emission region EA of the white pixel region W-SP, the pitch of the second microlenses 440 increases and the reflection of external light is reduced.

Therefore, in the OLED display 400 of the present invention, the external light reflection is minimized, the color temperature in the white pixel region W-SP is improved or maximized, and the luminance degradation by the blue color filter pattern 430 is prevented .

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

4 and 9, the pitch of the microlenses 317 corresponding to the blue color filter pattern 330 is set to the light emitting area EA of the white pixel area W-SP May be smaller than the pitch of the micro lenses 317 formed.

The present invention is not limited to the above-described embodiments, and various modifications may be made 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 filters 106c, 306c, 406c: green color filters
108, 308, 408: Overcoat layer 108a:
107a, 307a and 407a: a first interlayer insulating film
107b, 307b, and 407b: a second interlayer insulating film
110c, 310c, and 410c:
111, 311, 411: first electrodes 113, 313, 413:
115, 315, 415: second electrode
117, 317, 440, 450: micro lenses
117a, 317a, 442, 452: convex portions 117b, 317b, 444, 454:
119, 319: bank
200, 330, 430: blue color filter pattern
E: Light emitting diode

Claims (19)

A substrate including a white pixel region;
A blue color filter pattern located in a first region of the white pixel region;
An overcoat layer covering the blue color filter pattern and having a microlens;
A first electrode positioned on the overcoat layer;
An organic light emitting layer covering the first electrode;
And a second electrode
And an organic light emitting diode.
The method according to claim 1,
Wherein the white pixel region includes a light emitting region and a non-emitting region around the light emitting region,
And the blue color filter pattern is located in the non-emission region.
3. The method of claim 2,
The substrate further comprises a first pixel region adjacent to the white pixel region along a first direction,
And a first color filter is disposed in the light emitting region of the first pixel region.
The method of claim 3,
Wherein the overcoat layer has a depression in the non-emission region between the white pixel region and the first pixel region, and the second electrode is located in the depression.
5. The method of claim 4,
And a bank disposed in the non-emission region and covering an edge of the first electrode,
And the bank exposes the depression.
5. The method of claim 4,
And the second electrode is located between the first color filter and the blue color filter pattern in the depression.
The method according to claim 6,
Wherein the first pixel region is a red pixel region, and the first color filter is a red color filter.
5. The method of claim 4,
Further comprising a metal interconnection disposed between the substrate and the overcoat layer, wherein the metal interconnection overlaps with the depression.
3. The method of claim 2,
The first pixel region is a blue pixel region, the first color filter is a blue color filter,
And the blue color filter pattern extends from the first color filter.
10. The method of claim 9,
Wherein the microlens is provided in the non-emission region between the white pixel region and the first pixel region and corresponds to the blue color filter pattern.
11. The method of claim 10,
Wherein the microlens has a first aspect ratio in the non-emission region of the white pixel region and a second aspect ratio in the emission region of the white pixel region that is smaller than the first aspect ratio.
10. The method of claim 9,
Wherein the blue color filter pattern corresponds to at least two sides of the light emitting region of the white pixel region.
10. The method of claim 9,
Wherein the substrate further comprises a second pixel region adjacent to the first pixel region in a direction opposite to the white pixel region,
Wherein the microlens provided in the second pixel region corresponds to the light emitting region of the second pixel region and the microlens provided in the white pixel region corresponds to both the light emitting region and the non- The organic light emitting display device comprising:
14. The method of claim 13,
And a bank located in the non-emission region and having an opening corresponding to the emission region,
In the second pixel region, the area of the opening is equal to the area of the microlens,
Wherein an area of the opening in the white pixel region is smaller than an area of the microlens.
14. The method of claim 13,
And a bank located in the non-emission region and having an opening corresponding to the emission region,
In the non-emission region between the white pixel region and the first pixel region, the bank has a roughened surface,
Wherein the bank has a flat surface in a non-emission region between the first pixel region and the second pixel region.
14. The method of claim 13,
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 region between the white pixel region and the first pixel region, and the ratio between the ratio of the ratio between the first pixel region and the second pixel region And a flat surface in the light emitting region.
The method according to claim 1,
Wherein the microlens has a first aspect ratio in the first region and a second aspect ratio in the second region excluding the first region, the second aspect ratio being smaller than the first aspect ratio.
The method according to claim 1,
Wherein the first region intersects the white pixel region at the center of the white pixel region.
19. The method of claim 18,
Further comprising a blue color filter located in a second pixel region adjacent to the white pixel region,
And the blue color filter pattern extends from the blue color filter.

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