CN110010786B

CN110010786B - Organic Light Emitting Display Device

Info

Publication number: CN110010786B
Application number: CN201811404480.2A
Authority: CN
Inventors: 张志向; 李康柱; 郑承龙; 朴汉善; 金秀刚; 赵昭英; 田成秀; 具沅会; 林炫秀; 朴济澔; 崔民根; 金贤柱; 尹优览
Original assignee: LG Display Co Ltd
Current assignee: LG Display Co Ltd
Priority date: 2015-10-30
Filing date: 2016-10-28
Publication date: 2021-08-31
Anticipated expiration: 2036-10-28
Also published as: TW201813152A; GB2564588B; GB201815130D0; KR102737441B1; JP6487898B2; JP2018037391A; CN110010786A; CN107039598B; CN107039598A; TWI713213B; KR20170052455A; KR20250003379A; TW201841362A; TWI647871B; GB2564588A

Abstract

The invention discloses an organic light-emitting display device. Wherein the substrate is divided into a plurality of sub-pixels that generate light of different colors. A light-leakage prevention layer is provided on a portion of the substrate corresponding to a light-emitting region of at least one of the plurality of sub-pixels. A cover layer is provided on a portion of the substrate corresponding to at least one of the plurality of sub-pixels, and the cover layer includes a microlens having a plurality of concave portions or a plurality of convex portions. An organic electroluminescent device is arranged on the cover layer.

Description

Organic light emitting display device

The present application is a divisional application of a chinese patent application entitled "organic light emitting display device" with application number 201610963440.6, and 201610963440.6 is a chinese patent application filed in 2016, 10, 28.

Cross Reference to Related Applications

This application claims priority from korean patent application No. 10-2015-.

Technical Field

The present disclosure relates generally to an organic light emitting display device, and more particularly, to an organic light emitting display device capable of preventing light leakage.

Background

The organic light emitting display device can be manufactured to be relatively thin and light since a separate light source is not required since an organic Electroluminescent (EL) device or an Organic Light Emitting Diode (OLED) capable of emitting light by itself is used therein. In addition, organic light emitting display devices are advantageous not only in terms of power consumption since they are driven at low voltages, but also in desirable qualities such as the ability to realize a range of colors, fast response speed, wide viewing angle, and high contrast. Thus, active research has been conducted on organic light emitting display devices for next generation displays.

Light generated by an organic light emitting layer of an organic light emitting display device is emitted from the organic light emitting display device through several components of the organic light emitting display device. However, a part of light generated through the organic light emitting layer may not be emitted from the organic light emitting display device and may be trapped within the organic light emitting display device, thereby causing a problem of low light extraction efficiency of the organic light emitting display device.

Specifically, in the case of an organic light emitting display device having a bottom emission structure, about 50% of light generated through an organic light emitting layer may be trapped within the organic light emitting display device by total internal reflection or light absorption of an anode electrode, while about 30% of light generated through the organic light emitting layer may be trapped within the organic light emitting display device by total internal reflection or light absorption of a substrate. That is, about 80% of light generated through the organic light emitting layer may be trapped within the organic light emitting display device, and only about 20% of light may be emitted outward, resulting in poor light extraction efficiency.

In order to improve light extraction efficiency of the organic light emitting display device, a method of attaching a microlens array (MLA) to a capping layer of the organic light emitting display device or a method of forming a microlens on the capping layer of the organic light emitting display device has been proposed.

When an MLA is disposed outside a substrate of an organic light emitting display device or a microlens is formed on a cover layer, light generated through an organic light emitting layer passes through the substrate to a polarizer, and then is reflected from the polarizer to be reoriented toward the substrate. Here, a portion of the light traveling toward the substrate may reach the microlenses of the adjacent pixels on which the light of different colors is generated, thereby causing light leakage, which is problematic.

Disclosure of Invention

Various aspects of the present disclosure provide an organic light emitting display device capable of preventing light leakage while improving light extraction efficiency.

In one aspect of the present disclosure, an organic light emitting display device may include: a substrate divided into a plurality of sub-pixels generating light of different colors; a light leakage prevention layer disposed on a portion of the substrate corresponding to the light emitting region of at least one of the plurality of sub-pixels; a cover layer disposed on a portion of the substrate corresponding to at least one of the plurality of sub-pixels and including a microlens having a plurality of concave portions or a plurality of convex portions; and an organic electroluminescent device disposed on the cover layer.

In at least some embodiments of the present disclosure, the plurality of sub-pixels may be divided into a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. The light leakage preventing layer may include first to fourth light leakage preventing layers respectively disposed in the plurality of sub-pixels. At least two of the first to fourth light leakage prevention layers may allow the same color light to pass therethrough. Alternatively, at least one of the first to fourth light leakage prevention layers may allow at least one color of light complementary to at least one color of light passing through the remaining light leakage prevention layers of the first to third light leakage prevention layers to pass therethrough.

The microlenses may include first microlenses and second microlenses, the second microlenses being disposed in at least one of the plurality of subpixels where the first microlenses are not disposed, the second microlenses being the same as or different from the first microlenses. The microlenses may further include a third microlens that is the same as the first microlens or the second microlens or different from the first microlens and the second microlens.

In at least some embodiments of the present disclosure, in the organic light emitting display device, the light leakage preventing layer may not be disposed in at least one of the plurality of sub-pixels. The first microlens may not be disposed in at least one of the plurality of subpixels.

According to the present disclosure as set forth above, an organic light emitting display device includes a light leakage preventing layer disposed in a region corresponding to a light emitting region of at least one sub-pixel among a plurality of sub-pixels to prevent or reduce light leakage between different sub-pixels or different pixels while preventing a reduction in extraction efficiency of light generated by an organic light Emitting (EL) device.

Further, in the organic light emitting display device according to the present disclosure, each of the plurality of pixels includes a plurality of sub-pixels, wherein the plurality of sub-pixels are provided with different microlenses or at least one of the plurality of sub-pixels is not provided with a microlens, so that light extraction efficiency can be adjusted according to the sub-pixels and light leakage can be prevented.

Drawings

The above and other objects, features and advantages of the present disclosure will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:

fig. 1 is a block diagram schematically illustrating a display apparatus according to an exemplary embodiment;

fig. 2 is a plan view illustrating an organic light emitting display device according to a first exemplary embodiment;

fig. 3 is a cross-sectional view of an organic light emitting display device according to a first exemplary embodiment, taken along line a-B of fig. 2;

fig. 4 is a plan view illustrating an organic light emitting display device according to a second exemplary embodiment;

fig. 5 is a cross-sectional view of an organic light emitting display device according to a second exemplary embodiment, taken along line C-D of fig. 4;

fig. 6 is a plan view illustrating an organic light emitting display device according to a third exemplary embodiment;

fig. 7 is a cross-sectional view of an organic light emitting display device according to a third exemplary embodiment, taken along line E-F of fig. 6;

fig. 8 is a plan view illustrating an organic light emitting display device according to a fourth exemplary embodiment;

fig. 9 is a cross-sectional view of an organic light emitting display device according to a fourth exemplary embodiment, taken along line G-H of fig. 8;

fig. 10 is a plan view illustrating an organic light emitting display device according to a fifth exemplary embodiment;

fig. 11 is a cross-sectional view of an organic light emitting display device according to a fifth exemplary embodiment taken along line I-J of fig. 10;

fig. 12 is a plan view illustrating an organic light emitting display device according to a sixth exemplary embodiment;

fig. 13 is a cross-sectional view of an organic light emitting display device according to a sixth exemplary embodiment taken along line K-L of fig. 12;

fig. 14 is a plan view illustrating an organic light emitting display device according to a seventh exemplary embodiment;

fig. 15 is a cross-sectional view of an organic light emitting display device according to a seventh exemplary embodiment taken along line M-N of fig. 14;

FIG. 16 shows a configuration of a fourth light leakage preventing layer and an insulating layer provided in a fourth sub-pixel according to an alternative embodiment; and

fig. 17 is a graph showing the reflectance reduction effect of the organic light emitting display devices in the present embodiment and the comparative example.

Detailed Description

Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. The embodiments set forth herein are provided for illustrative purposes to fully convey the concept of the present disclosure to those skilled in the art. The present disclosure should not be construed as limited to such embodiments and may be embodied in many different forms. In the drawings, the size and thickness of the devices may be exaggerated for clarity. The same reference numbers and symbols will be used throughout the document to refer to the same or like parts.

Advantages and features of the present disclosure and methods of accomplishing the same will become apparent with reference to the drawings and detailed description of the embodiments. The present disclosure should not be construed as limited to the embodiments set forth herein but may be embodied in many different forms. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. The scope of the present disclosure should be defined by the appended claims. The same reference numbers and symbols will be used throughout the document to refer to the same or like parts. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

It will be understood that when an element or layer is referred to as being "on" another element or layer, it can be "directly on" the other element or layer, or "indirectly on" the other element or layer via "intervening" elements or layers. In contrast, when an element or layer is referred to as being "directly on" another element or layer, it will be understood that no intervening elements or layers are interposed.

For convenience in describing the relationship of an element or component to another element or other component as illustrated in the figures, spatially relative terms, such as "below," in. Spatially relative terms should be understood to include terms of different orientations of the elements in use or operation in addition to the orientation depicted in the figures. For example, when an element shown in the figures is turned over, elements described as "below," "beneath," or "under" another element would then be oriented "above" the other element. Thus, the exemplary terms "below," "under," or "under" may include both an orientation of above and below.

Furthermore, terms such as "first," "second," "a," "B," "a," and "(B)" may be used herein to describe components. It should be understood, however, that these terms are only used to distinguish one element from another element, and the nature, order, sequence or number of elements is not limited by these terms.

Fig. 1 is a block diagram schematically illustrating a display apparatus according to an exemplary embodiment. Referring to fig. 1, a display apparatus 1000 according to an exemplary embodiment includes: a display panel 1100 on which a plurality of first lines VL1 to VLm are arranged in a first direction, i.e., a vertical direction in the drawing, and a plurality of second lines HL1 to HLn are arranged in a second direction, i.e., a horizontal direction in the drawing; a first driver circuit 1200 that supplies a first signal to the plurality of first lines VL1 to VLm; a second driver circuit 1300 which supplies a second signal to the plurality of second lines HL1 to HLn; and a timing controller 1400 that controls the first driver circuit 1200 and the second driver circuit 1300.

A plurality of pixels P are defined on the display panel 1100 by intersections of the plurality of first lines VL1 to VLm arranged in the first direction and the plurality of second lines HL1 to HLn arranged in the second direction.

Each of the first driver circuit 1200 and the second driver circuit 1300 may include at least one driver Integrated Circuit (IC) to output an image display signal.

For example, the plurality of first lines VL1 through VLm arranged in the first direction on the display panel 1100 may be data lines arranged in a vertical direction to transfer data voltages (i.e., first signals) to pixel columns arranged in the vertical direction. The first driver circuit 1200 may be a data driver circuit that supplies a data voltage to a data line.

Further, for example, the plurality of second lines HL1 through HLn arranged on the display panel 1100 in the second direction may be gate lines arranged in the horizontal direction to transfer scan signals (i.e., second signals) to pixel rows arranged in the horizontal direction. The second driver circuit may be a gate driver that supplies a scan signal to the gate lines.

The display panel 1100 has pads disposed thereon such that the display panel 1100 is connected to the first driver circuit 1200 and the second driver circuit 1300. When the first driver circuit 1200 supplies the first signal to the plurality of first lines VL1 through VLm, the pad transmits the first signal to the display panel 1100. In the same manner, when the second driver circuit 1300 provides the second signal to the plurality of second lines HL1 to HLn, the pad transfers the second signal to the display panel 1100.

Each pixel includes one or more sub-pixels. The colors defined by the subpixels may be red (R), green (G), blue (B), and optionally white (W), but the present disclosure is not limited thereto.

In the display panel, an electrode connected to a Thin Film Transistor (TFT) that controls each sub-pixel to generate light is referred to as a first electrode, and an electrode disposed on a front surface of the display panel or covering two or more pixels is referred to as a second electrode. When the first electrode is an anode, the second electrode is a cathode, and vice versa. Hereinafter, the first electrode will be referred to as an anode and the second electrode will be referred to as a cathode, but the present disclosure is not limited thereto.

The organic light emitting display device may be classified into a top emission type or a bottom emission type according to the structure of the electroluminescent device. Although the following embodiments will be described with reference to a bottom emission type organic light emitting display device, the present disclosure is not limited thereto.

Each sub-pixel may be a substrate on which a color filter having a single color is or is not disposed. The color filter converts the color of the single organic light emitting layer into a color of a specific wavelength. In addition, a light scattering layer may be disposed in each sub-pixel to improve light extraction efficiency of the organic light emitting layer. The light scattering layer may be referred to as a microlens array, a nano pattern, a diffusion pattern, silica beads, etc.

Hereinafter, embodiments of the scattering layer will be described with reference to the microlens array. However, exemplary embodiments of the present disclosure are not limited thereto, and various structures for scattering light may be combined therewith.

Hereinafter, an organic light emitting display device according to a first exemplary embodiment will be described with reference to fig. 2. Fig. 2 is a plan view illustrating an organic light emitting display device according to a first exemplary embodiment.

Referring to fig. 2, in the organic light emitting display device according to the first exemplary embodiment, a single pixel P includes a plurality of sub-pixels. Specifically, the single pixel P may include four (4) sub-pixels. In the following exemplary embodiments, a single pixel P will be described as including four sub-pixels. However, the exemplary embodiment is not limited thereto, and may comprehensively include all configurations in which a single pixel P includes two (2) to four (4) sub-pixels.

The plurality of sub-pixels (e.g., four sub-pixels) include light emitting regions EA11, EA21, EA31, and EA41, respectively. For example, the first sub-pixel includes a first light emitting region EA11, the second sub-pixel includes a second light emitting region EA21, the third sub-pixel includes a third light emitting region EA31, and the fourth sub-pixel includes a fourth light emitting region EA 41.

Although the first to fourth light emitting regions EA11, EA21, EA31 and EA41 may be regions from which light of red (R), green (G), blue (B) and white (W) wavelength ranges is emitted, exemplary embodiments are not limited thereto. Specifically, a configuration may be adopted in which at least two light emitting regions among the four light emitting regions EA11, EA21, EA31, and EA41 emit light of a color different from the above-described red (R), green (G), blue (B), and white (W).

A plurality of microlenses are provided in each of the light emitting regions EA11, EA21, EA31, and EA 41. The shapes of the microlenses disposed in the light emitting regions EA11, EA21, EA31, and EA41 may be the same, for example, tapered with a cross-section defined as, for example, a straight line, a curved line, or a parabolic line. The microlens can improve external light extraction efficiency of the organic EL device. The plurality of microlenses includes a plurality of first concave portions 201 and a plurality of first connection portions 202 formed in the cover layer 120, each of the plurality of first connection portions 202 connecting adjacent first concave portions 201.

Microlenses having the same shape are arranged in the first to fourth light emitting regions EA11, EA21, EA31, and EA 41. This configuration will now be described with reference to fig. 3.

Fig. 3 is a cross-sectional view of an organic light emitting display device according to a first exemplary embodiment, taken along line a-B of fig. 2. Referring to fig. 3, the organic light emitting display device according to the first exemplary embodiment includes first to fourth sub-pixels SP1, SP2, SP3, and SP 4.

When light generated by the EL device travels toward the substrate 100, a portion of the light may reach a microlens of an adjacent sub-pixel or a microlens of another adjacent pixel that generates light of a different color, thereby causing light leakage. In particular, when the display device is provided with sub-pixels having no color filter, a large amount of light leakage components generated by other sub-pixels may reach the microlenses of the sub-pixels having no color filter to be visually perceived. In particular, when a color filter is not disposed in the white (W) sub-pixel, a light leakage component generated through another sub-pixel may reach a microlens of the white sub-pixel to be visually perceived by an observer, which is problematic.

In order to overcome this problem, the organic light emitting display device according to the first exemplary embodiment includes the light

leakage preventing layers

110, 111, 112, and 113 disposed on the substrate 100 divided into the first to fourth sub-pixels SP1 to SP 4. More generally, a light leakage prevention layer is a layer configured to prevent or substantially reduce light leakage between different subpixels, for example, by preventing or substantially reducing at least a portion of light generated in a subpixel from reaching an adjacent subpixel of a different subpixel. According to some embodiments, the light leakage prevention layer may include various types of light leakage prevention layers. In some embodiments, the light leakage prevention layer may include at least one of: an I-type light leakage preventing layer configured to allow light of a specific wavelength to pass therethrough while absorbing light of the remaining wavelengths; a type II light leakage preventing layer configured to allow light of a specific wavelength to pass therethrough while absorbing a part of visible light to allow the remaining visible light to pass therethrough; a type III light leakage preventing layer configured to allow light to pass therethrough or be reflected while changing an optical axis of the light, and then absorb the light having the changed optical axis through the polarizer. In embodiments, the type I light leakage prevention layer selectively allows a specific color of light to pass therethrough while absorbing the remaining wavelengths of light, such that a majority (e.g., at least 60%) of the specific color of light passes therethrough while absorbing a majority (e.g., at least 60%) of the remaining wavelengths of light. In embodiments, a type III light leakage prevention layer allows light to pass therethrough or be reflected while changing, for example, the optical axis of at least 50% of the light. Specifically, the first light leakage preventing layer 110 is disposed on the first sub-pixel SP1, the second light leakage preventing layer 111 is disposed on the second sub-pixel SP2, the third light leakage preventing layer 112 is disposed on the third sub-pixel SP3, and the fourth light leakage preventing layer 113 is disposed on the fourth sub-pixel SP 4.

A cover layer 120 is disposed on the substrate 100 including the first to fourth light leakage preventing layers 110 to 113. An organic electroluminescent device EL including a first electrode 130, an organic light emitting layer 140, and a second electrode 150 is disposed on the capping layer 120.

The organic electroluminescent device EL may be configured to correspond to the microlens in the cover layer 120 to improve external light extraction efficiency in the light emitting regions EA11, EA21, EA31, and EA 41. Light emitting regions EA11, EA21, EA31, and EA41 are defined by bank patterns 160, and the bank patterns 160 are configured to expose predetermined portions of the top surface of the first electrode 130.

Specifically, the cover layer 120 includes a plurality of microlenses in each of the light emitting regions EA11, EA21, EA31, and EA 41. The plurality of microlenses are configured of a plurality of first concave portions 201 and a plurality of connecting portions 202, each of which connects adjacent first concave portions 201. When the organic electroluminescent device EL is configured to have a plurality of microlenses in the light-emitting regions EA11, EA21, EA31, and EA41, the plurality of concave portions 201 formed in the cover layer 120 give a surface concave curved portion of the organic electroluminescent device EL due to the characteristics of the pattern.

The first to fourth light leakage preventing layers 110 to 113 are disposed in regions of the first to fourth sub-pixels SP1 to SP4 corresponding to the light emitting regions EA11, EA21, EA31, and EA 41. With this configuration, the organic light emitting display device according to the first exemplary embodiment may prevent or reduce light leakage between different sub-pixels. Here, the first to fourth light leakage prevention layers 110 to 113 may allow light of a specific wavelength to pass therethrough while absorbing light of the remaining wavelengths. Further, at least one of the first to fourth light leakage preventing layers 110 to 113 is thinner than the other light leakage preventing layers to increase its transmittance to be higher than that of the other light leakage preventing layers.

Hereinafter, by describing the principle of preventing light leakage in detail using the first to fourth light leakage preventing layers 110 to 113, the refractive indexes of the first electrode 130 and the organic light emitting layer 140 of the organic electroluminescent device EL may be higher than those of the substrate 100 and the cover layer 120. For example, the refractive indices of the substrate 100 and the cover layer 120 are about 1.5, and the refractive indices of the first electrode 130 and the organic light emitting layer 140 of the organic electroluminescent device EL are in the range of 1.7 to 2.0.

A portion of the light 800 generated by the organic light emitting layer 140 is reflected by the second electrode 150 and redirected toward the first electrode 130, while the remaining portion of the light generated by the organic light emitting layer 140 is emitted toward the first electrode 130. That is, most of the light generated by the organic light emitting layer 140 is oriented toward the first electrode 130.

Since the refractive index of the organic light emitting layer 140 is substantially equal to that of the first electrode 130, the path of light generated by the organic light emitting layer 140 is not changed at the boundary between the organic light emitting layer 140 and the first electrode 130. Due to the difference in refractive index between the first electrode 130 and the capping layer 120, when incident at an angle equal to or greater than a threshold angle, light passing through the first electrode 130 may be completely reflected at the boundary between the first electrode 130 and the capping layer 120.

In this case, the light totally reflected at the boundary between the first electrode 130 and the cover layer 120 is reflected again by the second electrode 150, and passes through the organic light emitting layer 140 and the first electrode 130, and then passes through the substrate 100 (the refractive index of the substrate 100 is substantially the same as that of the cover layer 120) to reach a polarizer (not shown) disposed on the rear surface of the substrate 100. The light is then reflected by a polarizer (not shown) to be reoriented toward the substrate 100.

Further, in the organic light emitting display device according to the first exemplary embodiment, the first to fourth light leakage preventing layers 110 to 113 are disposed on the substrate 100, more specifically, in regions corresponding to the light emitting regions EA11, EA21, EA31 and EA41, to prevent light traveling at an angle greater than a total reflection threshold angle from reaching a microlens of an adjacent sub-pixel or another pixel.

Specifically, a portion of the light 800 generated by the organic light emitting layer 140 is completely reflected at the boundary between the first electrode 130 and the capping layer 120, and then reflected by the second electrode 150 to be re-oriented toward the substrate 100. In this case, a portion of the light 800 traveling at an angle less than the total reflection threshold angle passes through the cover layer 120 and the substrate 100, and is then re-reflected at the boundary between the substrate 100 and the polarizer (not shown) to be re-oriented toward the substrate 100.

Subsequently, a portion of the light redirected toward the substrate 100 passes through the substrate 100 again to reach one of the first to fourth light leakage preventing layers 110 to 113 disposed on the substrate 100. When the portion of the light reaches one of the first to fourth light leakage preventing layers 110 to 113, the portion of the light is absorbed thereby. Since light generated by different sub-pixels or different pixels is absorbed by the light leakage preventing layer as described above, light leakage from the organic light emitting display device including a plurality of microlenses may be prevented or reduced.

Since the first to fourth light leakage prevention layers 110 to 113 according to the present embodiment are characterized by allowing light of a specific wavelength to pass therethrough while absorbing light of the remaining wavelengths, the first to fourth light leakage prevention layers 110 to 113 may allow light of a specific wavelength among light leakage components to pass therethrough while absorbing light of the remaining wavelengths among the light leakage components. For example, when the fourth light leakage preventing layer 113 allowing blue light B to pass therethrough is disposed in the fourth subpixel SP4, the fourth light leakage preventing layer 113 allows a light leakage component of light having a blue wavelength range to pass therethrough while absorbing light having the remaining wavelength range. In this case, bluish light may be emitted from the fourth sub-pixel SP 4. In the case of a display device with a low efficiency of blue light, this can therefore compensate for the blue light.

Alternatively, at least two of the first to fourth light leakage preventing layers 110 to 113 may allow the same color light to pass therethrough. For example, the first to third light leakage prevention layers 110, 111 and 112 allow light of different colors to pass therethrough, and the fourth light leakage prevention layer 113 allows light of the same color as that of the light passing therethrough from the first to third light leakage prevention layers 110, 111 and 112 to pass therethrough.

More specifically, the first light leakage prevention layer 110 allows red (R) light to pass therethrough, the second light leakage prevention layer 111 allows green (G) light to pass therethrough, and the third light leakage prevention layer 112 allows blue (B) light to pass therethrough, while the fourth light leakage prevention layer 113 allows one of red light, green light, and blue light to pass therethrough. In another exemplary embodiment or a different exemplary embodiment, the fourth light leakage prevention layer 113 may be configured to be thinner than any one of the first to third light leakage prevention layers 110, 111, and 112 to be able to allow not only one or more of red, green, and blue light but also other visible light to pass therethrough. Here, each of the first to third light leakage prevention layers 110, 111, and 112 may have a transmittance of 60% or more for light of a specific wavelength range, while the fourth light leakage prevention layer 113 may have a transmittance of 60% or more for visible light. Each of the first to third light leakage prevention layers 110, 111, and 112 allows light of one color to pass therethrough while absorbing light of other colors.

When the first light leakage preventing layer 110 and the fourth light leakage preventing layer 113 allow the same color light to pass therethrough and the light leakage component generated by the second sub-pixel SP2 or the third sub-pixel SP3 is oriented toward the fourth sub-pixel SP4, the light leakage component is absorbed by the fourth light leakage preventing layer 113. This can prevent light leakage between different sub-pixels or different pixels. Further, since the fourth light leakage prevention layer 113 is configured to be thinner than any one of the first to third light leakage prevention layers 110, 111, and 112, the transmittance of visible light of the fourth light leakage prevention layer 113 may be relatively high. Since the fourth sub-pixel SP4 is provided with the relatively thin fourth light leakage preventing layer 113, the fourth sub-pixel SP4 may have a higher level of light transmittance than other sub-pixels while being capable of preventing light leakage.

Further, when the green light leakage component or the blue light leakage component generated by the second sub-pixel SP2 or the third sub-pixel SP3 is oriented toward the fourth sub-pixel SP4, the fourth light leakage prevention layer 113 absorbs the green light or the blue light, so that light leakage can be prevented. The fourth light leakage prevention layer 113 selectively allows red light to pass therethrough, thereby being able to absorb light generated by the second sub-pixel SP2 or the third sub-pixel SP 3.

Further, the first light leakage prevention layer 110 may absorb a green light leakage component or a blue light leakage component generated by the second sub-pixel SP2 or the third sub-pixel SP3, and the second light leakage prevention layer 111 may absorb a red light leakage component or a blue light leakage component generated by the first sub-pixel SP1 or the third sub-pixel SP3, while the third light leakage prevention layer 112 may absorb a red light leakage component or a green light leakage component generated by the first sub-pixel SP1 or the second sub-pixel SP 2.

Although the fourth light leakage preventing layer 113 has been illustrated to allow light of the same color as the color of light allowed to pass therethrough by the first light leakage preventing layer 110 in the configuration as described above, the organic light emitting display device according to the first exemplary embodiment is not limited thereto. Specifically, the color of light allowed to pass through the fourth light leakage prevention layer 113 may be the same as the color of light allowed to pass through the second light leakage prevention layer 111 or the third light leakage prevention layer 112.

Since light generated by different sub-pixels or different pixels is absorbed by the light leakage preventing layer as described above, light leakage from the organic light emitting display device including a plurality of microlenses may be prevented or reduced.

Further, the first to fourth light leakage preventing layers 110 to 113 are not limited to the configurations as shown above. Here, the color of light allowed to pass through at least one of the first to fourth light leakage preventing layers 110 to 113 may be complementary to the color of light allowed to pass through the other of the first to fourth light leakage preventing layers 110 to 113.

For example, the first, second, and third light

leakage preventing layers

110, 111, and 112 may allow light of different colors to pass therethrough, and the fourth light leakage preventing layer 113 may allow light of one or more colors complementary to the color of light passing through one of the first to third light

leakage preventing layers

110, 111, and 112 to pass therethrough.

Specifically, the fourth light leakage prevention layer 113 may allow light of a wavelength range complementary to green light to pass therethrough. In other words, the fourth light leakage prevention layer 113 may allow light (or light of a wavelength range) corresponding to colors of coordinates (0.35, 0.1) to (0.55, 3) in the 1931CIE-xy color coordinate system to pass therethrough.

With this configuration, the fourth light leakage preventing layer 113 can prevent or reduce light leakage from different sub-pixels or between different pixels by absorbing red, green, or blue light leakage components generated by the first to third sub-pixels SP1, SP2, and SP 3. Specifically, the fourth light leakage prevention layer 113 allows light of a wavelength range corresponding to coordinates (0.35, 0.1) to (0.55, 3) in the 1931CIE-xy color coordinate system to pass therethrough while absorbing light of other colors, thereby minimizing light leakage.

Since the fourth light leakage prevention layer 113 allows light of a wavelength range corresponding to coordinates (0.35, 0.1) to (0.55, 3) in the 1931CIE-xy color coordinate system to pass therethrough, the fourth light leakage prevention layer 113 can prevent or reduce loss of light generated by the organic electroluminescent device EL disposed in the fourth subpixel SP 4. In particular, since the low-efficiency absorption of blue light and red light is minimized, the light emitting efficiency of the organic electroluminescent device EL in the fourth subpixel SP4 can be prevented from being reduced by the fourth light leakage prevention layer 113.

Although the fourth light leakage prevention layer 113 of the organic light emitting display device according to the first exemplary embodiment has been described as being configured to allow light of a wavelength range complementary to green light to pass therethrough, the fourth light leakage prevention layer 113 of the organic light emitting display device according to the first exemplary embodiment is not limited thereto and may be configured to allow light of a wavelength range complementary to red light or blue light to pass therethrough.

As described above, since the first to fourth light leakage preventing layers 110 to 113 are disposed in the regions of the first to fourth sub-pixels SP1 to SP4 corresponding to the first to fourth light emitting regions EA11, EA21, EA31 and EA41, the organic light emitting display device according to the first exemplary embodiment may prevent or reduce light leakage among different sub-pixels or different pixels.

In addition, since the fourth light leakage preventing layer 113 allows light (or light of a wavelength range) of a color corresponding to coordinates (0.35, 0.1) to (0.55, 3) in the 1931CIE-xy color coordinate system to pass therethrough, the organic light emitting display device according to the first exemplary embodiment may prevent or reduce light leakage between different sub-pixels or different pixels while preventing a reduction in light emitting efficiency of the organic electroluminescent device.

Hereinafter, an organic light emitting display device according to a second exemplary embodiment will be described with reference to fig. 4 and 5. Fig. 4 is a plan view illustrating an organic light emitting display device according to a second exemplary embodiment.

The organic light emitting display device according to the second exemplary embodiment may include the same components as those of the foregoing embodiments. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiments. Further, the same reference numerals or symbols will be used hereinafter to refer to the same or like parts.

Referring to fig. 4, an organic light emitting display device according to a second exemplary embodiment is substantially the same as the organic light emitting display device according to the first exemplary embodiment except for the shape of a microlens disposed in at least one light emitting region.

Specifically, each of the first to fourth sub-pixels includes first to fourth light emitting regions EA11, EA21, EA32, and EA 41. The shapes of the microlenses arranged in at least one of the first to fourth light emitting regions EA11, EA21, EA32, and EA41 may be different from those of the microlenses arranged on the remaining light emitting regions.

Referring to fig. 4, the first microlenses are disposed in the first, second, and fourth light emitting regions EA11, EA21, and EA41, while the second microlenses are disposed in the third light emitting region EA 32. The shape of the first microlens may be different from the shape of the second microlens.

Specifically, the first microlens includes a plurality of first concave portions 201 and a plurality of first connection portions 202, each of which connects adjacent first concave portions 201. The second microlens includes a plurality of second concave portions 301 and a plurality of second connection portions 302, each of which connects adjacent first concave portions 301.

Here, at least one of a diameter D (maximum diameter), a depth H, a full width at half maximum (FWHM), a gap G between adjacent recesses, a slope S, and an aspect ratio a/R of the first recess 201 may be different from a corresponding one of the second recesses 301. FWHM refers to the full width of the dimple measured at half the maximum depth of the dimple. The aspect ratio a/R is a value obtained by dividing the depth H of the recess by the maximum radius D/2 of the recess.

Although the diameter D2 of the second recess 301 of the second microlens is shown to be smaller than the diameter D1 of the first recess 201 of the first microlens in fig. 4 and 5, the second exemplary embodiment is not limited thereto. Any configuration in which the shape of the first recess 201 is different from the shape of the second recess 301 may be adopted.

This configuration will now be described in detail with reference to fig. 5. Fig. 5 is a cross-sectional view of an organic light emitting display device according to a second exemplary embodiment, taken along line C-D of fig. 4. Referring to fig. 5, first microlenses having the same shape are disposed in the first light-emitting region EA11, the second light-emitting region EA21, and the fourth light-emitting region EA 41. Second microlenses having a different shape from the first microlenses are arranged in third light-emitting areas EA 32.

The diameter D2 of the second recess 301 of the second microlens may be smaller than the diameter D1 of the first recess 201 of the first microlens. The concave portion of the microlens is fitted into the cover layer 120 to improve external light extraction efficiency, and a change in the optical path according to the shape of the concave portion of the microlens is a main factor to improve light extraction efficiency. Therefore, the light efficiency may be different according to the diameter D of the concave portion of the microlens.

Specifically, since the diameter D2 of the second concave portion 301 of the second microlens disposed in the third light emitting region EA32 is smaller than the diameter D1 of the first concave portion 201 of the first microlens disposed in the first light emitting region EA11, the second light emitting region EA21, and the fourth light emitting region EA41, the frequency at which light generated from the third light emitting region EA32 of the organic electroluminescent device EL reaches the microlens structure can be increased. Thereby, the light extraction efficiency of the sub-pixel in which the organic electroluminescent device EL having low efficiency can be disposed can be further improved.

In addition, since the first to fourth light leakage preventing layers 110 to 113 are provided in the first to fourth sub-pixels SP1, SP2, SP3 and SP4, light leakage between different sub-pixels or different pixels may be prevented or reduced.

Hereinafter, an organic light emitting display device according to a third exemplary embodiment will be described with reference to fig. 6 and 7. Fig. 6 is a plan view illustrating an organic light emitting display device according to a third exemplary embodiment, and fig. 7 is a sectional view of the organic light emitting display device according to the third exemplary embodiment, taken along line E-F of fig. 6.

The organic light emitting display device according to the third exemplary embodiment may include the same components as those of the foregoing embodiments unless otherwise noted. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiments. Further, the same reference numerals or symbols will be used hereinafter to refer to the same or like parts.

Referring to fig. 6 and 7, in the organic light emitting display device according to the third exemplary embodiment, at least one light emitting region of four light emitting regions EA11, EA21, EA33, and EA42 included in a single pixel P may have a region where a light leakage preventing layer is not disposed. In addition, at least one light emitting region of the four light emitting regions EA11, EA21, EA33, and EA42 may have a region where no microlens is disposed.

For example, each of the first light emitting region EA1l and the second light emitting region EA21 includes a light leakage preventing layer, and the third light emitting region EA33 or the fourth light emitting region EA42 does not include a light leakage preventing layer. In addition, each of the first and second light emitting regions EA11 and EA21 includes a microlens, and the third or fourth light emitting region EA33 or EA42 does not include a microlens. That is, the light emitting region including the region in which the light leakage preventing layer is not disposed may not include the microlens.

The organic light emitting display device according to the third exemplary embodiment is not limited thereto, and the light emitting region including the light leakage preventing layer may not include the microlens.

Specifically, each of the first and second light emitting regions EA11 and EA21 includes a first light leakage prevention layer 110 and a second light leakage prevention layer 111. In contrast, neither the third light emitting region EA33 nor the fourth light emitting region EA42 includes a light leakage prevention layer.

In the first and second light emitting areas EA11 and EA21, the cover layer 220 is provided with microlenses having the same shape. In addition, in the third light emitting area EA33 and the fourth light emitting area EA42, the cover layer 220 may not be provided with microlenses.

That is, in the third and fourth light emitting areas EA33 and EA42, the cover layer 220 may be formed to be flat. Accordingly, the first electrode 230, the organic light emitting layer 240, and the second electrode 250 are also formed to be flat.

Here, no light leakage preventing layer or microlens is disposed in the fourth light emitting area EA 42. Since no microlens is disposed in the fourth subpixel SP4 most susceptible to light leakage, a light leakage component generated by a subpixel generating light of a different color can be prevented from being extracted through the microlens disposed in the fourth subpixel SP4, whereby no light leakage component is visually perceived.

As described above, no microlens is provided in the fourth sub-pixel SP4 to prevent light leakage, thereby making it possible to omit the configuration of the light leakage preventing layer in the fourth sub-pixel SP 4.

Although a configuration in which neither a light leakage preventing layer nor a microlens is disposed in the third light emitting region EA33 is illustrated in fig. 6 and 7, the organic light emitting display device according to the third exemplary embodiment is not limited thereto. Specifically, neither a microlens nor a light leakage preventing layer may be provided not only in the fourth sub-pixel SP4 but also in one of the first to third sub-pixels SP1, SP2, and SP 3.

This prevents light that would otherwise cause light leakage from being extracted outward through the microlens, not only in the fourth subpixel but also in other subpixels that are susceptible to light leakage.

Hereinafter, an organic light emitting display device according to a fourth exemplary embodiment will be described with reference to fig. 8 and 9. Fig. 8 is a plan view illustrating an organic light emitting display device according to a fourth exemplary embodiment, and fig. 9 is a sectional view of the organic light emitting display device according to the fourth exemplary embodiment, taken along line G-H of fig. 8.

The organic light emitting display device according to the fourth exemplary embodiment may include the same components as those of the foregoing embodiments unless otherwise noted. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiments. Further, the same reference numerals or symbols will be used hereinafter to refer to the same or like parts.

Referring to fig. 8 and 9, an organic light emitting display device according to a fourth exemplary embodiment has microlenses arranged in at least two light emitting regions of a plurality of light emitting regions EA12, EA21, EA33, and EA42 included in a single pixel P. The organic light emitting display device according to the fourth exemplary embodiment is different from the organic light emitting display device according to the third exemplary embodiment in that the shape of the microlens arranged in at least one light emitting region is different from the shape of the microlens arranged on the remaining light emitting regions.

Specifically, the first to fourth sub-pixels include a first light emitting region EA12, a second light emitting region EA21, a third light emitting region EA33, and a fourth light emitting region EA42, respectively. The microlenses are arranged in at least two light emitting regions of the first to fourth light emitting regions EA12, EA21, EA33, and EA 42. In the at least two light emitting regions, the shape of the microlenses arranged in one light emitting region may be different from the shape of the microlenses arranged on the remaining light emitting regions. Further, the light leakage preventing layer and the microlens may be disposed in the at least one light emitting region.

For example, second microlenses are arranged in the first light-emitting region EA12, first microlenses are arranged in the second light-emitting region EA21, and microlenses are not arranged in the third light-emitting region EA33 and the fourth light-emitting region EA 42. Here, the shape of the first microlens may be different from the shape of the second microlens.

Specifically, the diameter D2 of the second concave portion 301 of the second microlens disposed in the first light emitting area EA12 is smaller than the diameter D1 of the first concave portion 201 of the first microlens. Therefore, the number of second microlenses per unit area in the first light-emitting region EA12 is greater than the number of first microlenses per unit area in the second light-emitting region EA 21.

As described above, the number of microlenses arranged in the first light-emitting region EA12 in which an electroluminescent device having lower efficiency is provided is larger than the number of microlenses arranged in the second light-emitting region EA21, thereby increasing the frequency at which light generated by the electroluminescent device EL (330, 340, and 350) reaches the microlenses. This may thus increase the light emitting efficiency of the first light emitting region EA12, thereby reducing power consumption.

Hereinafter, an organic light emitting display device according to a fifth exemplary embodiment will be described with reference to fig. 10 and 11. Fig. 10 is a plan view illustrating an organic light emitting display device according to a fifth exemplary embodiment, and fig. 11 is a sectional view of the organic light emitting display device according to the fifth exemplary embodiment, taken along line I-J of fig. 10.

The organic light emitting display device according to the fifth exemplary embodiment may include the same components as those of the foregoing embodiments unless otherwise noted. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiments. Further, the same reference numerals or symbols will be used hereinafter to refer to the same or like parts.

Referring to fig. 10 and 11, the organic light emitting display device according to the fifth exemplary embodiment has microlenses arranged on the capping layer 420 in at least three light emitting regions among the plurality of light emitting regions EA12, EA21, EA34, and EA42 included in a single pixel P.

The shape of the microlenses disposed in at least one light-emitting region may be different from the shape of the microlenses disposed on the remaining light-emitting regions. In some embodiments, the shape of the microlenses disposed in at least one light emitting region may be the same as the shape of the microlenses disposed on one of the remaining light emitting regions.

In the plurality of light emitting regions EA12, EA21, EA34, and EA42 included in the pixel P, a microlens is provided in at least one light emitting region, and no microlens is provided in the remaining light emitting region.

For example, microlenses are disposed in the first light-emitting region EA12, the second light-emitting region EA21, and the third light-emitting region EA34, and no microlens is disposed in the fourth light-emitting region EA 42.

Second, first, and third microlenses are disposed in the first, second, and third light-emitting regions EA12, EA21, and EA34, respectively. The shapes of the first to third microlenses are different from each other.

Specifically, the diameter D1 of the first recess 201 of the first microlens is larger than the diameter D2 of the second recess 301 of the second microlens, and the diameter D2 of the second recess 301 of the second microlens is larger than the diameter D3 of the third recess 401 of the third microlens.

Therefore, the number of microlenses per unit area in the third light emitting region EA34 is greater than the number of microlenses per unit area in the first light emitting region EA12, and the number of microlenses per unit area in the first light emitting region EA12 is greater than the number of microlenses per unit area in the second light emitting region EA 21.

The frequency at which light generated by the electroluminescent device EL (430, 440, 450) in the third light-emitting area EA34 will reach the microlens is greater than the frequency at which light generated by the electroluminescent device EL in the first light-emitting area EA12 or the second light-emitting area EA21 will reach the microlens, while the frequency at which light generated by the electroluminescent device EL in the first light-emitting area EA12 will reach the microlens is greater than the probability at which light generated by the electroluminescent device EL in the second light-emitting area EA21 will reach the microlens.

That is, the organic light emitting display device according to the fifth exemplary embodiment has the differently shaped microlenses according to the efficiency of the electroluminescent device disposed in the light emitting region, so that the light emitting efficiency may be improved according to the light emitting region.

Although the first concave portion 201 of the first microlens, the second concave portion 301 of the second microlens, and the third concave portion 401 of the third microlens have been described as having different diameters in the configurations shown in fig. 10 and 11, the present disclosure is not limited thereto, and may have any configuration as follows: wherein at least one of a diameter, a depth, a FWHM, a gap between adjacent recesses, a slope, and an aspect ratio of one of the first to third recesses is different from a corresponding one of the other recesses.

Hereinafter, an organic light emitting display device according to a sixth exemplary embodiment will be described with reference to fig. 12 and 13. Fig. 12 is a plan view illustrating an organic light emitting display device according to a sixth exemplary embodiment, and fig. 13 is a sectional view of the organic light emitting display device according to the sixth exemplary embodiment taken along line K-L of fig. 12.

The organic light emitting display device according to the sixth exemplary embodiment may include the same components as those of the foregoing embodiments unless otherwise noted. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiments. Further, the same reference numerals or symbols will be used hereinafter to refer to the same or like parts.

Referring to fig. 12 and 13, in the organic light emitting display device according to the sixth exemplary embodiment, a single pixel P includes a plurality of light emitting regions EA11, EA22, EA31, and EA41 in which microlenses are disposed in a first light emitting region EA11, a third light emitting region EA31, and a fourth light emitting region EA41, and no microlens is disposed in a second light emitting region EA 22.

A first light leakage prevention layer 110, a second light leakage prevention layer 111, a third light leakage prevention layer 112, and a fourth light leakage prevention layer 113 are disposed on portions of the substrate 100 corresponding to the light emitting regions EA11, EA22, EA31, EA 41.

When the electroluminescent device EL (530, 540, 550) for generating green light is disposed in the second light emitting region EA22, a plurality of microlenses are disposed in the first light emitting region EA11, the third light emitting region EA31, and the fourth light emitting region EA41, which have lower light emitting efficiency than the second light emitting region EA 22. This can improve the light emission efficiency.

Hereinafter, an organic light emitting display device according to a seventh exemplary embodiment will be described with reference to fig. 14 and 15. Fig. 14 is a plan view illustrating an organic light emitting display device according to a seventh exemplary embodiment, and fig. 15 is a sectional view of the organic light emitting display device according to the seventh exemplary embodiment taken along line M-N of fig. 14.

The organic light emitting display device according to the seventh exemplary embodiment may include the same components as those of the foregoing embodiments unless otherwise noted. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiments. Further, the same reference numerals or symbols will be used hereinafter to refer to the same or like parts.

Referring to fig. 14, the organic light emitting display device according to the seventh exemplary embodiment has a microlens arranged in each of a plurality of light emitting regions EA11, EA21, EA31, and EA43 included in a single pixel P. Further, in the sub-pixel included in the single pixel P, the light leakage preventing layer may be disposed under the cover layer 320 including the microlens.

In the single pixel P, the light leakage preventing layer disposed in at least one sub-pixel may be formed of a material different from that of the light leakage preventing layer disposed in the other sub-pixels. This may thus reduce the reflectivity of the particular sub-pixel and reduce light leakage.

This configuration will now be described with reference to fig. 15. Referring to fig. 15, in the organic light emitting display device according to the seventh exemplary embodiment, the fourth light leakage preventing layer 210 disposed in at least one sub-pixel among a plurality of sub-pixels of a single pixel may be formed of a light reflective material. Further, the first to third light

leakage preventing layers

110, 111 and 112 provided in the other sub-pixels of the plurality of sub-pixels in a single pixel allow red, green and blue light, respectively, to pass therethrough.

Specifically, an insulating layer 200 is disposed on a substrate 100 of the organic light emitting display device. The first to fourth light leakage prevention layers 110, 111, 112 and 210 are disposed on portions of the insulating layer 200 corresponding to the light emitting regions EA11, EA21, EA31 and EA43 of the sub-pixels SP1, SP2, SP3 and SP 4. The first to third light leakage prevention layers 110, 111 and 112 disposed in the first to third sub-pixels SP1, SP2 and SP3 allow red, green and blue light, respectively, to pass therethrough. Further, the fourth light leakage preventing layer 210 disposed in the fourth sub-pixel SP4 may reflect light.

The fourth light leakage preventing layer 210 disposed in the fourth sub-pixel SP4 may be composed of two or more layers. Specifically, the fourth light leakage preventing layer 210 disposed in the fourth subpixel SP4 includes a first metal layer 211 disposed on the insulating layer 200 and a second metal layer 212 disposed on the first metal layer 211. Here, the insulating layer 200 may be made of a material selected from, but not limited to, silicon nitride (SiN)_x) And silicon oxide (SiO)₂) An inorganic insulating layer formed in the first layer.

Since the fourth light leakage prevention layer 210 composed of two or more metal layers as described above is disposed in the fourth sub-pixel SP4, light leakage components generated by sub-pixels other than the fourth sub-pixel SP4 may be reflected by the first metal layer 211 or the second metal layer 212 to be re-oriented toward the substrate 100, thereby reaching a polarizer (not shown) disposed under the substrate 100.

The light leakage component reflected by the first metal layer 211 or the second metal layer 212 is reoriented such that its path is different from the optical axis of the polarizer (not shown), thereby being trapped within the display device without being extracted from the substrate 100. That is, the light leakage component reoriented by the first metal layer 211 or the second metal layer 212 is trapped within the display device, so that the light leakage component is not visually perceived by an observer.

In other words, when the fourth light leakage preventing layer 210 is not disposed in the fourth sub-pixel SP4, the light leakage components generated by the remaining sub-pixels may be reoriented at the boundary between the substrate 100 and the polarizer (not shown) to reach the microlens of the fourth sub-pixel SP 4. Light that has reached the microlens may be extracted from the substrate 100 by the microlens, resulting in light leakage. That is, the microlens may convert the optical axis of light having reached the microlens to be coaxial with the optical axis of a polarizer (not shown), whereby light may be extracted from the substrate 100 to be visually perceived by an observer.

In addition, when the external light 850 enters the fourth sub-pixel SP4 from the outside of the substrate 100, the external light 850 may be reflected by the first or

second metal layer

211 or 212 to be re-oriented toward the substrate 100. Since the optical axis of the external light 850 is changed while the external light 850 is reflected by the first metal layer 211 or the second metal layer 212, the external light 850 does not pass through a polarizer (not shown) disposed on the bottom surface of the substrate 100. Since the external light 850 cannot exit the display device, the reflectance of the external light 850 can be reduced.

The first metal layer 211 may be formed of a material having a negative permittivity/dielectric constant (permittivity) or a negative dielectric constant. The absolute value of the dielectric constant of the first metal layer 211 may be greater than the absolute value of the dielectric constant of the insulating layer 200.

The first metal layer 211 may be formed of an alkaline earth metal having a negative dielectric constant, whose absolute value is greater than that of the dielectric constant of the insulating layer 200. However, the material of the first metal layer 211 according to the present embodiment is not limited thereto. For example, the first metal layer 211 may be formed of at least one material having a negative dielectric constant selected from the group consisting of: beryllium (Be), calcium (Ca), barium (Ba), strontium (Sr), radium (Ra), lithium (Li), sodium (Na), and magnesium (Mg).

A second metal layer 212 formed of a metal is disposed on the first metal layer 211. The second metal layer 212 may be formed of at least one selected from silver (Ag), aluminum (Al), and gold (Au).

When light reaches the boundary between the insulating layer and the metal layer having a high dielectric constant, incident light may be absorbed by the metal layer or a large portion thereof may be lost due to a non-emitting plasmon mode, thereby reducing transmittance. According to the non-emitting plasma mode, the light loss is caused by: interference of electronic oscillation on the surface of the metal layer serving as a reflector and the wavelength of light generated by the organic electroluminescent device, and absorption by the metal layer. That is, when the insulating layer and the metal layer serving as the reflector are disposed to contact each other, light is lost at the boundary between the insulating layer and the metal layer, thereby reducing transmittance.

In contrast, the first metal layer 211 having a negative dielectric constant is disposed in the fourth subpixel SP4 disposed between the insulating layer 200 and the second metal layer 212, and the absolute value of the dielectric constant of the first metal layer 211 is greater than the absolute value of the dielectric constant of the insulating layer 200. This configuration can thus reduce the amount of light loss, thereby improving the transmittance of the fourth subpixel SP 4. Accordingly, light generated by the electroluminescent device EL may be extracted from the substrate 100 to the outside through the fourth light leakage preventing layer 210 composed of the first metal layer 211 and the second metal layer 212.

Specifically, since the dielectric constant of the first metal layer 211 is negative, the refractive index of the first metal layer 211 may be negative. More specifically, the refractive index can be expressed as the square root of the product of the dielectric constant and the magnetic permeability. Since the dielectric constant of the first metal layer 211 is a negative value, the refractive index of the first metal layer 211 may also be a negative value.

Materials with negative refractive indices allow light to pass therethrough without reflecting or absorbing incident light. In addition, the first metal layer 211 and the second metal layer 212 may be configured to be significantly thin. For example, the thickness of each of the first and

second metal layers

211 and 212 may be in a range of 1nm to 30 nm. Since the first metal layer 211 and the second metal layer 212 are formed to be thin, the transmittance of the fourth light leakage preventing layer 210 may be improved.

When light generated by the electroluminescent device EL reaches the second metal layer 212 in the fourth light leakage preventing layer 210 through the cover layer 320, a part of the light is reflected by the second metal layer 212, and the remaining part of the light reaches the first metal layer 211 through the second metal layer 212. As described above, the first metal layer 211 does not reflect or absorb light, so that light can be extracted from the substrate 100 outward through the first metal layer 211.

Accordingly, due to the insulating layer 200 disposed on the substrate 100 and the first and

second metal layers

211 and 212 disposed on the insulating layer 200, a light leakage component and reflectance may be reduced, while transmittance of light generated by the electroluminescent device EL may be improved.

The arrangement of the insulating layer 200 and the fourth light leakage preventing layer 210 provided in the fourth sub-pixel SP4 is not limited to the above-described structure.

Hereinafter, an insulating layer and a fourth light leakage preventing layer disposed in a fourth sub-pixel according to an alternative embodiment will be described with reference to fig. 16. Fig. 16 illustrates a structure of an insulating layer and a fourth light leakage preventing layer provided in a fourth sub-pixel according to an alternative embodiment.

Referring to fig. 16, in the display device according to the alternative embodiment, an insulating layer 300 is disposed on portions of the substrate 100 corresponding to the first to third sub-pixels SP1, SP2, and SP3, and first to third light

leakage preventing layers

110, 111, and 112 are disposed on the insulating layer 300.

A cover layer 420 including a microlens is disposed on the first to third light

leakage preventing layers

110, 111 and 112 disposed in the first to third sub-pixels SP1, SP2 and SP 3. An electroluminescent device EL including a first electrode 430, an organic light emitting layer 440, and a second electrode 450 is disposed on the capping layer 420.

In addition, a fourth light leakage preventing layer 310 is disposed on a portion of the substrate 100 corresponding to the fourth subpixel SP 4. The fourth light leakage preventing layer 310 includes a third metal layer 311 and a fourth metal layer 312. A portion of the insulating layer 300 is disposed on the fourth metal layer 312, and the portion of the insulating layer 300 is integrally formed with portions of the insulating layer 300 disposed in the first to third sub-pixels SP1, SP2, and SP 3. That is, the insulating layer 300 to be disposed in the fourth sub-pixel SP4 may be formed using a process of forming the insulating layer 300 in the first to third sub-pixels SP1, SP2 and SP3 without any additional process.

A cover layer 420 including a microlens is disposed on the insulating layer 300 of the fourth subpixel SP4, and an electroluminescent device EL including a first electrode 430, an organic light-emitting layer 440, and a second electrode 450 is disposed on the cover layer 420. The shapes of the first electrode 430, the organic light emitting layer 440, and the second electrode 450 disposed in the first to fourth sub-pixels SP1 to SP4 may be determined based on the topography of the micro-lenses disposed on the overcoat layer 420.

Each of the third metal layer 311 and the fourth metal layer 312 disposed in the fourth subpixel SP4 may be composed of one or more layers. The third metal layer 311 may be formed of a metal. For example, the third metal layer 311 may be formed of at least one selected from silver (Ag), aluminum (Al), and gold (Au).

The fourth metal layer 312 may be formed of an alkaline earth metal having a negative dielectric constant, which has an absolute value greater than that of the dielectric constant of the insulating layer 300. However, the material of the fourth metal layer 312 according to the present embodiment is not limited thereto. For example, the fourth metal layer 312 may be formed of at least one material having a negative dielectric constant selected from the group consisting of: beryllium (Be), calcium (Ca), barium (Ba), strontium (Sr), radium (Ra), lithium (Li), sodium (Na) and magnesium (Mg).

In addition, the third metal layer 311 and the fourth metal layer 312 may be configured to be significantly thin. For example, the thickness of each of the third and

fourth metal layers

311 and 312 may be in the range of 1nm to 30 nm. Since the third metal layer 311 and the fourth metal layer 312 are formed to be thin, the transmittance of the fourth light leakage preventing layer 310 may be improved.

As described above, in the fourth sub-pixel SP4, the third metal layer 311 is disposed on the substrate 100, the fourth metal layer 312 is disposed on the third metal layer 311, and the insulating layer 300 is disposed on the fourth metal layer 312. This can thus reduce the light leakage component and reflectance while improving the transmittance of light generated by the organic electroluminescent device EL.

In the organic light emitting display device, any configuration may be used as long as the light leakage preventing layer provided in at least one sub-pixel is composed of two or more layers formed of a metal, wherein one metal layer having a negative dielectric constant (an absolute value of which is larger than that of the insulating layer) is provided between the insulating layer and another metal layer having a higher level of reflectivity.

Hereinafter, the reflectance reduction effect of the organic light emitting display device of the present embodiment and the reflectance reduction effect of the organic light emitting display device of the comparative example will be compared. Fig. 17 is a graph showing the reflectance reduction effect of the organic light emitting display devices in the present embodiment and the comparative example.

Referring to fig. 17, organic light emitting display devices in which a metal layer having only a high level of reflectivity per organic light emitting display device was provided as a light leakage preventing layer (comparative example) were compared with organic light emitting display devices in which the light leakage preventing layer of each organic light emitting display device included a first metal layer and a second metal layer stacked on each other (present embodiment), wherein the first metal layer had a negative dielectric constant whose absolute value was greater than that of an insulating layer in contact with the light leakage preventing layer, and the second metal layer had a higher level of reflectivity.

In fig. 17, an x-axis indicates an incident angle of external light to the organic light emitting display device, and a y-axis indicates a reflectance of the organic light emitting display device. The metal layer having a higher level of reflectivity is formed of silver (Ag), and the metal layer having a negative dielectric constant, which is greater in absolute value than that of the insulating layer in contact with the light leakage preventing layer, is formed of calcium (Ca).

In the organic light emitting display device having the microlens, when external light is incident at a large angle (e.g., 40 ° or more), the external light is diffused through the microlens to be visually perceived by an observer. Therefore, as in the above-described embodiments, it is necessary to prevent external light incident to the organic light-emitting display device from exiting the display device by changing the optical axis of the external light using the light leakage prevention layer or the like.

However, as shown in fig. 17, when external light is incident to the organic light emitting display device at a large angle (e.g., 40 ° or more), it is understood that the organic light emitting display device of the comparative example including the light leakage preventing layers of 5nm and 10nm formed of only silver (Ag) reflects about 5% to about 30% of the external light. This means that the difference ratio of the optical axis of external light incident to the display device to the optical axis of the polarizer is only about 5% to about 30%.

In contrast, it is understood that the organic light emitting display device of the present embodiment, which includes the light leakage preventing layer in which calcium (Ca) and silver (Ag) are layered at a thickness of 5nm to 10nm, respectively, reflects about 50% to about 80% of external light incident at a large angle. This means that the ratio of the difference between the optical axis of external light incident to the display device and the optical axis of the polarizer is about 50% to about 80%.

As described above, it is understood that each light leakage preventing layer of the organic light emitting display device of the present embodiment reflects a larger amount of external light than each light leakage preventing layer of the organic light emitting display device of the comparative example. That is, an increase in the amount of external light reflected by the light leakage preventing layer provided in each of the organic light emitting display devices of the present embodiment causes the optical axis of the external light to be different from the optical axis of the polarizer, thereby reducing the amount of light exiting the display device. Therefore, this can reduce the reflectance of external light.

According to the present disclosure set forth above, an organic light emitting display device includes a light leakage preventing layer disposed in an area corresponding to a light emitting area in at least one sub-pixel among a plurality of sub-pixels to prevent or reduce light leakage from or between different sub-pixels while preventing a reduction in extraction efficiency of light generated by an organic Electroluminescent (EL) device.

Further, in the organic light emitting display device according to the present disclosure, each of the plurality of pixels includes a plurality of sub-pixels, wherein the plurality of sub-pixels include different microlenses or at least one of the plurality of sub-pixels is not provided with a microlens, so that light extraction efficiency can be adjusted according to the sub-pixels and light leakage can be prevented.

The features, structures, and effects described in the present disclosure are included in at least one embodiment, but are not necessarily limited to a particular embodiment. Those skilled in the art may apply the features, structures, and effects shown in a particular embodiment to another embodiment by combining or modifying the features, structures, and effects. It is to be understood that all such combinations and modifications are intended to be included within the scope of the present disclosure.

Although exemplary embodiments of the present disclosure have been described for illustrative purposes, those skilled in the art will appreciate that various modifications and applications are possible without departing from the essential characteristics of the present disclosure. For example, various modifications may be made to the specific components of the exemplary embodiments.

The invention provides at least the following solutions:

scheme 1. an organic light emitting display device, comprising:

a substrate divided into a plurality of sub-pixels generating light of different colors;

a light leakage prevention layer disposed on a portion of the substrate corresponding to a light emitting region of at least one of the plurality of sub-pixels;

a cover layer disposed on a portion of the substrate corresponding to at least one of the plurality of sub-pixels and including a microlens having a plurality of concave portions or a plurality of convex portions; and

an organic electroluminescent device disposed on the capping layer.

Scheme 2. the organic light emitting display device according to scheme 1, wherein

The plurality of sub-pixels are divided into a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, an

The light leakage prevention layer comprises a first light leakage prevention layer to a fourth light leakage prevention layer which are respectively arranged in the plurality of sub-pixels, and at least one of the first light leakage prevention layer to the fourth light leakage prevention layer is thinner than other light leakage prevention layers in the first light leakage prevention layer to the fourth light leakage prevention layer.

Scheme 3. the organic light-emitting display device according to scheme 2, wherein at least two of the first to fourth light leakage prevention layers allow light of the same color to pass therethrough.

Scheme 4. the organic light-emitting display device according to scheme 2, wherein at least one of the first to fourth light leakage prevention layers allows at least one color of light complementary to at least one color of light passing through the remaining light leakage prevention layers of the first to fourth light leakage prevention layers to pass therethrough.

Scheme 5. the organic light emitting display device according to scheme 2, wherein the microlenses include first microlenses and second microlenses, the second microlenses being disposed in at least one of the plurality of sub-pixels not disposed with the first microlenses, the second microlenses being the same as or different from the first microlenses.

Scheme 6. the organic light emitting display device according to scheme 5, wherein at least one of a diameter, a height, a half-peak width, a slope, and an aspect ratio of the plurality of convex portions of the second microlens, and a distance between adjacent convex portions is different from a corresponding one of a diameter, a height, a half-peak width, a slope, and an aspect ratio of the plurality of convex portions of the first microlens, and a distance between adjacent convex portions.

Scheme 7. the organic light emitting display device according to scheme 5, wherein at least one of a diameter, a depth, a half-peak width, a slope, and an aspect ratio of the plurality of recesses of the second microlens, and a distance between adjacent recesses is different from a corresponding one of a diameter, a depth, a half-peak width, a slope, and an aspect ratio of the plurality of recesses of the first microlens, and a distance between adjacent recesses.

Scheme 8. the organic light emitting display device of scheme 5, wherein the microlenses further comprise a third microlens disposed in at least one of the plurality of subpixels not having the first microlens disposed thereon and not having the second microlens disposed thereon, the third microlens being disposed the same as the first microlens or the second microlens or different from the first microlens and the second microlens.

Scheme 9. the organic light emitting display device according to scheme 7, wherein at least one of a diameter, a height, a half-peak width, a slope, and an aspect ratio of the plurality of convex portions of the third microlens, and a distance between adjacent convex portions is different from a corresponding one of a diameter, a height, a half-peak width, a slope, and an aspect ratio of the plurality of convex portions of the first microlens or the second microlens, and a distance between adjacent convex portions.

Scheme 10 the organic light emitting display device of scheme 7, wherein at least one of a diameter, a depth, a half-peak width, a slope, and an aspect ratio of the plurality of recesses of the third microlens, and a distance between adjacent recesses is different from a corresponding one of a diameter, a depth, a half-peak width, a slope, and an aspect ratio of the plurality of recesses of the first microlens and the second microlens, and a distance between adjacent recesses.

Scheme 11. the organic light emitting display device according to scheme 1, wherein the plurality of sub-pixels are divided into a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, and the light leakage preventing layer is not disposed in at least one of the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel.

Scheme 12. the organic light-emitting display device according to scheme 11, wherein the microlens is not disposed in the at least one of the red, green, blue, and white subpixels in which the light leakage preventing layer is not disposed.

Scheme 13. the organic light emitting display device of scheme 12, wherein the at least one of the red, green, blue, and white sub-pixels not provided with the light leakage preventing layer and the microlens is a white sub-pixel.

Scheme 14. the organic light emitting display device according to scheme 1, wherein the microlens is not disposed in at least one of the plurality of subpixels.

Scheme 15. the organic light emitting display device according to scheme 1, wherein the light leakage preventing layer disposed in the at least one of the plurality of sub-pixels includes a first metal layer and a second metal layer or includes a third metal layer and a fourth metal layer.

Scheme 16. the organic light emitting display device according to scheme 15, further comprising:

an insulating layer disposed on the substrate; and

the first metal layer and the second metal layer disposed in the at least one of the plurality of subpixels, the first metal layer disposed on the insulating layer and comprising one or more layers, the second metal layer disposed on the first metal layer and comprising one or more vias.

Scheme 17. the organic light emitting display device according to scheme 16, wherein the dielectric constant of the first metal layer is negative, and an absolute value of the dielectric constant of the first metal layer is larger than an absolute value of the dielectric constant of the insulating layer.

Scheme 18. the organic light emitting display device according to scheme 16, wherein the second metal layer is formed of at least one selected from silver (Ag), Aluminum (AI), and gold (Au), and the first metal layer is formed of at least one selected from beryllium (Be), calcium (Ca), barium (Ba), strontium (Sr), radium (Ra), lithium (Li), sodium (Na), and magnesium (Mg).

Scheme 19. the organic light emitting display device according to scheme 15, comprising:

the third metal layer in the at least one of the plurality of sub-pixels disposed on the substrate;

the fourth metal layer disposed on the third metal layer; and

an insulating layer disposed on the fourth metal layer.

Scheme 20 the organic light emitting display device of scheme 19, wherein the dielectric constant of the fourth metal layer is negative, and the absolute value of the dielectric constant of the fourth metal layer is greater than the absolute value of the dielectric constant of the insulating layer.

Scheme 21 the organic light emitting display device of scheme 19, wherein the third metal layer is formed of at least one selected from silver (Ag), aluminum (Al), and gold (Au), and the fourth metal layer is formed of at least one selected from beryllium (Be), calcium (Ca), barium (Ba), strontium (Sr), radium (Ra), lithium (Li), sodium (Na), and magnesium (Mg).

An organic light emitting display device according to claim 19, wherein the insulating layer is disposed on the substrate and the light leakage preventing layer is disposed on the insulating layer in remaining sub-pixels of the plurality of sub-pixels different from the at least one sub-pixel,

wherein a portion of the insulating layer disposed in the at least one sub-pixel is integrally formed with a remaining portion of the insulating layer disposed in the remaining sub-pixels.

Scheme 23. the organic light-emitting display device according to scheme 1, wherein the light leakage prevention layer comprises at least one of: an I-type light leakage prevention layer configured to allow light of a specific wavelength to pass therethrough while absorbing light of the remaining wavelengths; a type II light leakage preventing layer configured to allow light of a specific wavelength to pass therethrough while absorbing a portion of visible light to allow the remaining visible light to pass therethrough; and a type III light leakage preventing layer configured to allow light to pass therethrough or be reflected while changing an optical axis of the light, the light having the changed optical axis being capable of being subsequently absorbed by the polarizer.

Scheme 24. the organic light-emitting display device of scheme 23, wherein the light leakage prevention layer comprises at least one of a type II light leakage prevention layer and a type III light leakage prevention layer, and at least one type I light leakage prevention layer.

Scheme 25. the organic light emitting display device of scheme 23, wherein the I-type light leakage preventing layer selectively allows a specific color of light to pass therethrough while absorbing remaining wavelengths of light, whereby a majority of the specific color passes therethrough while a majority of the remaining wavelengths of light are absorbed.

Scheme 26. the organic light-emitting display device according to scheme 23, wherein the type III light leakage preventing layer allows light to pass therethrough or be reflected while changing an optical axis of the light.

Claims

1. An organic light-emitting display device, comprising:

substrate;

a pixel, the pixel is disposed on the substrate and includes a plurality of sub-pixels;

a cover layer disposed on the substrate, the cover layer comprising microlenses;

an organic electroluminescent device disposed on the cover layer;

a bank pattern disposed on the capping layer and configured to define light emitting regions of the plurality of subpixels; and

a filter layer respectively disposed in each sub-pixel of the plurality of sub-pixels, the filter layer being disposed under the cover layer,

wherein some of the plurality of sub-pixels include both microlenses and corresponding filter layers, and the remaining sub-pixels of the plurality of sub-pixels include only the filter layer, and

Wherein the organic electroluminescent device disposed on some of the sub-pixels in the plurality of sub-pixels is in direct contact with the surface of the filter layer.

2. The organic light emitting display device of claim 1, wherein each filter layer allows light of different colors to pass therethrough.

3 . The organic light emitting display device of claim 2 , wherein the microlenses disposed in some of the plurality of subpixels have different shapes from each other. 4 .

4 . The organic light emitting display device of claim 2 , wherein the numbers of microlenses per unit area provided in the some of the plurality of subpixels are different from each other. 5 .

5. The organic light emitting display device of claim 2, wherein:

The pixel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel,

the some of the plurality of subpixels include the red subpixel and the blue subpixel, and

The remaining sub-pixels of the plurality of sub-pixels include the green sub-pixels.

6. The organic light emitting display device of claim 5, wherein the pixel further comprises a white sub-pixel, and

Wherein the white sub-pixels include the microlenses.

7 . The organic light emitting display device of claim 6 , wherein the filter layer disposed in the white sub-pixel is larger than that disposed in the red sub-pixel, the green sub-pixel and the blue sub-pixel. 8 . The filter layer in is thin.

8. An organic light-emitting display device, comprising:

substrate;

a pixel disposed on the substrate, the pixel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel;

a filter layer, the filter layer is respectively disposed in each of the red sub-pixels, the green sub-pixels and the blue sub-pixels;

a cover layer disposed on the filter layer and comprising microlenses;

an organic electroluminescent device disposed on the cover layer; and

a bank pattern disposed on the capping layer and configured to define light emitting regions of the red sub-pixel, the green sub-pixel and the blue sub-pixel,

wherein each of the red sub-pixel and the blue sub-pixel includes the microlens disposed between the organic electroluminescent device and the substrate, and the microlens and the the filter layer between the substrates,

wherein the green subpixel includes the filter layer disposed between the organic electroluminescent device and the substrate; and

The organic electroluminescence device disposed on each of the red sub-pixels and the green sub-pixels is in direct contact with the surface of the filter layer.

9 . The organic light emitting display device of claim 8 , wherein the filter layers disposed in the red sub-pixel, the green sub-pixel and the blue sub-pixel allow light of different colors to pass therethrough. 10 .

10 . The organic light emitting display device of claim 8 , wherein the numbers of the microlenses per unit area provided in the red subpixel and the blue subpixel are different from each other. 11 .

11. The organic light emitting display device of claim 8, wherein the pixel further comprises a white sub-pixel, and

Wherein the white sub-pixel includes the microlens disposed between the organic electroluminescent device and the substrate.

12. The organic light emitting display device of claim 11, wherein the white sub-pixel further comprises the filter layer.

13 . The organic light emitting display device of claim 12 , wherein the filter layer disposed in the white sub-pixel is larger than that disposed in the red sub-pixel, the green sub-pixel and the blue sub-pixel. 14 . The filter layer in is thin.

14. An organic light-emitting display device, comprising:

substrate;

pixels disposed on the substrate, the pixels comprising a first group having some of the plurality of sub-pixels and a second group having the remainder of the plurality of sub-pixels subpixel;

a filter layer disposed in at least one sub-pixel of the plurality of sub-pixels;

a cover layer disposed on the substrate, the cover layer disposed on the filter layer;

an organic electroluminescent device disposed on the cover layer; and

a bank pattern disposed on the capping layer and configured to define light emitting regions of the plurality of sub-pixels,

wherein the cover layer includes a microlens disposed in each of the subpixels of the first group, and a flat surface disposed in the subpixels of the second group, and

wherein the organic electroluminescent device disposed on each of the sub-pixels of the first group and the filter disposed in at least one of the sub-pixels of the first group The surfaces of the layers are in direct contact.

15. The organic light emitting display device of claim 14, wherein the pixels comprise red sub-pixels, green sub-pixels, and blue sub-pixels, and the first group comprises the red sub-pixels and the blue sub-pixels , and the second group includes the green sub-pixels,

wherein each of the red sub-pixel and the blue sub-pixel includes the microlens disposed between the organic electroluminescent device and the substrate, and the microlens and the the filter layer between the substrates, and

Wherein the green sub-pixel includes a filter layer disposed between the flat surface of the cover layer and the substrate.

16. The organic light emitting display device of claim 15, wherein the filter layers disposed in the red subpixel, the green subpixel, and the blue subpixel allow light of different colors to pass therethrough.

17 . The organic light emitting display device of claim 15 , wherein the numbers of the microlenses per unit area provided in the red subpixel and the blue subpixel are different from each other. 18 .

18. The organic light emitting display device of claim 15, wherein the first group further comprises a white sub-pixel having the microlens and the filter layer.

19 . The organic light emitting display device of claim 18 , wherein the filter layer disposed in the white sub-pixel is larger than that disposed in the red sub-pixel, the green sub-pixel and the blue sub-pixel. 20 . The filter layer in is thin.