CN110010786A - Organic light-emitting display device - Google Patents

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

This application is a divisional application of a Chinese patent application entitled "Organic Light Emitting Display Device" with an application number of 201610963440.6, and 201610963440.6 is a Chinese patent application filed on October 28, 2016 according to the Paris Convention.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Korean Patent Application No. 10-2015-0152630 filed on October 30, 2015 and Korean Patent Application No. 10-2016-0112123 filed on August 31, 2016, which are incorporated herein by reference as Incorporated herein for all purposes as fully set forth herein.

technical field

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

Background technique

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 electroluminescence (EL) device or an organic light emitting diode (OLED) capable of self-luminescence is used therein. Furthermore, organic light emitting display devices are not only advantageous in power consumption (since they are driven at low voltages), but also have desirable qualities such as the ability to achieve a range of colors, fast response speed, wide viewing angle and high contrast ratio. Accordingly, organic light emitting display devices for next-generation displays have been actively researched.

Light generated by the organic light emitting layer of the 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 the light generated through the organic light emitting layer may not be emitted from the organic light emitting display device and may be trapped in 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 the light generated by the organic light emitting layer may be trapped in the organic light emitting display device through total internal reflection or light absorption of the anode electrode, while passing through the organic light emitting layer. About 30% of the light generated by the light emitting layer may be trapped within the organic light emitting display device through total internal reflection or light absorption of the substrate. That is, about 80% of the light generated by the organic light emitting layer may be trapped within the organic light emitting display device, and only about 20% of the light may be emitted outward, resulting in poor light extraction efficiency.

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

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

SUMMARY OF THE 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 that generate light of different colors; a light-leakage prevention layer disposed on the substrate and at least one of the plurality of sub-pixels on a portion corresponding to a light-emitting area of a sub-pixel; 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 a cover layer.

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

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

In at least some embodiments of the present disclosure, in an organic light emitting display device, a light leakage preventing layer may not be provided in at least one subpixel of the plurality of subpixels. The first microlens may not be provided 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 area of at least one subpixel among a plurality of subpixels to prevent or reduce light leakage between different subpixels or between different pixels , while preventing a reduction in the extraction efficiency of light generated by an organic light emitting (EL) device.

Furthermore, 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 micro-lens lens, so that light extraction efficiency can be adjusted according to sub-pixels and light leakage can be prevented.

Description of 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 device according to an exemplary embodiment;

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

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

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

5 is a cross-sectional view of the organic light emitting display device according to the 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;

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

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

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

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

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

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

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

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

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

FIG. 16 shows the configuration of a fourth light leakage preventing layer and an insulating layer disposed in a fourth subpixel according to an alternative embodiment; and

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

Detailed ways

Reference will now be made in detail to the 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 these embodiments, and may be embodied in many different forms. In the drawings, the size and thickness of devices may be exaggerated for clarity. Throughout this document, the same reference numbers and symbols will be used to refer to the same or similar parts.

Advantages and features of the present disclosure and methods for achieving the same will become apparent with reference to the accompanying drawings and the 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 better 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. Throughout this document, the same reference numbers and symbols will be used to refer to the same or similar 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 not only be "directly on" the other element or layer, but it may also be "intervening" via "intervening" elements or layers. Indirectly on" another element or layer. In contrast, when an element or layer is referred to as being "directly on" another element or layer, it will be understood that there are no intervening elements or layers.

To facilitate describing the relationship of an element or component to another element or component as illustrated in the figures, spatially relative terms such as "below", "under", "under", "lower", "above", and "upper". Spatially relative terms should be understood to include terms that include different orientations of 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 "beneath" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "below," "under," or "under" can encompass both an orientation of above and below.

Additionally, 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 and that the substance, order, sequence, or number of elements are not limited by these terms.

FIG. 1 is a block diagram schematically illustrating a display device according to an exemplary embodiment. 1 , a display device 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, ie, a vertical direction in the drawing, and along a second direction, ie, a vertical direction in the drawing. A plurality of second lines HL1 to HLn are arranged in the horizontal direction in the drawing; a first driver circuit 1200 that supplies a first signal to a plurality of first lines VL1 to VLm; a first driver circuit 1200 that supplies a second signal to the plurality of second lines HL1 to HLn Two driver circuits 1300; 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 to VLm arranged in the first direction on the display panel 1100 may be data lines arranged in the vertical direction to transfer data voltages (ie, first signals) to the pixel columns arranged in the vertical direction. The first driver circuit 1200 may be a data driver circuit that supplies data voltages to data lines.

Also, for example, the plurality of second lines HL1 to HLn arranged in the second direction on the display panel 1100 may be gate lines arranged in the horizontal direction to transfer scan signals (ie, second signals) to the pixels arranged in the horizontal direction Row. The second driver circuit may be a gate driver that supplies scan signals to the gate lines.

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

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

In a display panel, the electrode connected to the thin film transistor (TFT) that controls each sub-pixel to generate light is called the first electrode, while the electrode disposed on the front surface of the display panel or covering two or more pixels is called the first electrode for the second electrode. When the first electrode is the anode, the second electrode is the 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 electroluminescence 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 with or without a color filter having a single color disposed thereon. Color filters convert the color of a single organic light-emitting layer to a specific wavelength of color. In addition, a light scattering layer may be provided in each sub-pixel to improve the light extraction efficiency of the organic light emitting layer. The light scattering layer may be referred to as microlens arrays, nanopatterns, diffusing patterns, silica beads, and the like.

Hereinafter, embodiments of the scattering layer will be described with reference to a 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, a 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 embodiments are not limited thereto, and may comprehensively include all configurations in which a single pixel P includes two (2) sub-pixels to four (4) sub-pixels.

The plurality of sub-pixels (eg, four sub-pixels) include light-emitting areas EA11, EA21, EA31, and EA41, respectively. For example, the first subpixel includes a first light emitting area EA11, the second subpixel includes a second light emitting area EA21, the third subpixel includes a third light emitting area EA31, and the fourth subpixel includes a fourth light emitting area EA41.

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 are emitted, However, exemplary embodiments are not limited thereto. Specifically, at least two light-emitting regions among the four light-emitting regions EA11, EA21, EA31, and EA41 may be employed to emit light different from the above-mentioned red (R), green (G), blue (B), and white (W) Color configuration of light.

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

Microlenses having the same shape are arranged in the first to fourth light emitting areas EA11 , EA21 , EA31 and EA41 . This configuration will now be described with reference to FIG. 3 .

FIG. 3 is a cross-sectional view of the organic light emitting display device according to the first exemplary embodiment, taken along line A-B of FIG. 2 . 3 , the organic light emitting display device according to the first exemplary embodiment includes first to fourth subpixels SP1 , SP2 , SP3 and SP4 .

When the light generated by the EL device travels toward the substrate 100, a part of the light may reach a microlens of an adjacent subpixel or a microlens of another adjacent pixel that generates light of different colors, thereby causing light leakage. Specifically, when the display device is provided with sub-pixels without color filters, a large amount of light leakage components generated by other sub-pixels may reach the microlenses of the sub-pixels without color filters to be visually perceived. Specifically, when a color filter is not provided in the white (W) subpixel, a light leakage component generated by another subpixel can reach the microlens of the white subpixel to be visually perceived by an observer, which is problematic.

To overcome this problem, the organic light emitting display device according to the first exemplary embodiment includes light leakage preventing layers 110 , 111 , 112 and 113 disposed on the substrate 100 divided into the first to fourth subpixels SP1 to SP4 . More generally, an anti-leakage layer is a layer configured to prevent or substantially reduce light leakage between different sub-pixels, for example by preventing or substantially reducing at least a portion of the light generated in a sub-pixel from reaching adjacent sub-pixels of different sub-pixels . According to some embodiments, the light leakage preventing layer may include various types of light leakage preventing layers. In some embodiments, the light leakage prevention layer may include at least one of the following: a type I light leakage prevention layer configured to allow light of a specific wavelength to pass therethrough while absorbing light of remaining wavelengths; a type II light leakage prevention layer configured to allow light of the remaining wavelengths to pass therethrough; Light of a specific wavelength passes therethrough while absorbing a portion of the visible light to allow the remaining visible light to pass therethrough; a type III anti-leakage layer, which is configured to allow light to pass therethrough or be reflected while changing the optical axis of the light, and then absorb through a polarizer with a changed Optical axis of light. In an embodiment, the Type I light-leakage preventing layer selectively allows light of a particular color to pass therethrough while absorbing light of the remaining wavelengths so that a majority (eg, at least 60%) of light of a particular color passes therethrough while absorbing a majority (eg, at least 60%) of light of a particular color therethrough. 60%) of the remaining wavelengths of light. In embodiments, the Type III anti-leakage layer allows light to pass therethrough or be reflected while changing the optical axis of the light, eg, by at least 50%. Specifically, the first anti-leakage layer 110 is disposed on the first sub-pixel SP1, the second anti-leakage layer 111 is disposed on the second sub-pixel SP2, the third anti-leakage layer 112 is disposed on the third sub-pixel SP3, and the third anti-leakage layer 111 is disposed on the second sub-pixel SP2. Four light leakage prevention layers 113 are disposed on the fourth sub-pixel SP4.

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

The organic electroluminescence device EL may be configured to correspond to the microlenses in the cover layer 120 to improve external light extraction efficiency in the light emitting regions EA11, EA21, EA31, and EA41. The light emitting areas EA11 , EA21 , EA31 and EA41 are defined by bank patterns 160 configured to expose predetermined portions of the top surfaces of the first electrodes 130 .

Specifically, the cover layer 120 includes a plurality of microlenses in each of the light emitting areas EA11, EA21, EA31, and EA41. The plurality of microlenses are composed of a plurality of first concave portions 201 and a plurality of connecting portions 202 , and each of the connecting portions connects adjacent first concave portions 201 . When the organic electroluminescence device EL is configured to have a plurality of microlenses in the light emitting regions EA11, EA21, EA31, and EA41, the plurality of recesses 201 formed in the cover layer 120 imparts to the organic electroluminescence device EL due to the characteristics of the pattern. The surface is concave and curved.

The first to fourth light leakage prevention layers 110 to 113 are disposed in regions of the first to fourth subpixels SP1 to SP4 corresponding to the light emitting areas EA11 , EA21 , EA31 , and EA41 . With this configuration, the organic light emitting display device according to the first exemplary embodiment can prevent or reduce light leakage between different sub-pixels. Here, the first to fourth light leakage preventing layers 110 to 113 may allow light of a specific wavelength to pass therethrough while absorbing light of remaining wavelengths. In addition, at least one light leakage prevention layer among the first to fourth light leakage prevention layers 110 to 113 is thinner than the other light leakage prevention layers to improve its transmittance to be higher than that of the other light leakage prevention layers.

Hereinafter, the principle of preventing light leakage will be described in detail by using the first to fourth light leakage preventing layers 110 to 113 , the refractive indices of the first electrode 130 and the organic light emitting layer 140 of the organic electroluminescence device EL may be higher than those of the substrate 100 And the refractive index of the cover layer 120 is high. 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 electroluminescence 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 reoriented 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 the refractive index of the first electrode 130 , the path of light generated by the organic light emitting layer 140 is unchanged at the boundary between the organic light emitting layer 140 and the first electrode 130 . Due to the difference in the refractive index between the first electrode 130 and the capping layer 120 , when incident at an angle equal to or greater than the threshold angle, light passing through the first electrode 130 may be in the direction between the first electrode 130 and the capping layer 120 . Full reflection at the boundary.

In this case, the light completely reflected at the boundary between the first electrode 130 and the capping 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 a polarizer (not shown) provided on the rear surface of the substrate 100 . The light is then reflected by a polarizer (not shown) to be reoriented towards the substrate 100 .

In addition, 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 provided on the substrate 100, more specifically, are provided corresponding to the light emitting areas EA11, EA21, In the area of EA31 and EA41, to prevent light traveling at an angle greater than the total reflection threshold angle from reaching the 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 is then reflected by the second electrode 150 to be reoriented 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 Reoriented towards substrate 100 .

Subsequently, the portion of the light reoriented 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 thereby absorbed. Since light generated through different sub-pixels or different pixels is absorbed by the light leakage preventing layer as described above, light leakage from an organic light emitting display device including a plurality of microlenses can 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 It is possible to allow light of a specific wavelength in the leaked light component to pass therethrough, while absorbing light of the remaining wavelengths of the leaked light component. For example, when the fourth light leakage preventing layer 113 allowing the blue light B to pass therethrough is provided in the fourth sub-pixel SP4, the fourth light leakage preventing layer 113 allows the leakage light component of the light having the blue wavelength range to pass therethrough while absorbing the light having the remaining wavelengths therethrough range of light. In this case, bluish light can be emitted from the fourth sub-pixel SP4. In the case of display devices with low blue light efficiency, this can therefore compensate for blue light.

Alternatively, at least two light leakage preventing layers of the first to fourth light leakage preventing layers 110 to 113 may allow light of the same color to pass therethrough. For example, the first anti-leakage layer 110, the second anti-leakage layer 111 and the third anti-leakage layer 112 allow light of different colors to pass therethrough, while the fourth anti-leakage layer 113 is allowed to communicate with the first to third anti-leakage layers 110, 111, and 112 allow light of the same color to pass therethrough to pass therethrough.

More specifically, the first light leakage preventing layer 110 allows red (R) light to pass therethrough, the second light leakage preventing layer 111 allows green (G) light to pass therethrough, and the third light leakage preventing layer 112 allows blue (B) light to pass therethrough , while the fourth light leakage preventing 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 preventing layer 113 may be configured to be thinner than any one of the first to third light leakage preventing layers 110 , 111 and 112 to be able to not only One or more of red, green, and blue light and other visible light are allowed to pass therethrough. Here, the transmittance of each of the first to third light leakage preventing layers 110 , 111 , and 112 to light of a specific wavelength range may be 60% or more, while the fourth light leakage preventing layer The transmittance of 113 to visible light may be 60% or more. Each of the first to third light leakage preventing 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 light of the same color to pass therethrough and light leakage components generated by the second subpixel SP2 or the third subpixel SP3 are oriented toward the fourth subpixel SP4, light leaks The components are absorbed by the fourth light leakage preventing layer 113 . This can prevent light leakage between different sub-pixels or between different pixels. Furthermore, since the fourth light leakage preventing layer 113 is configured to be thinner than any one of the first to third light leakage preventing layers 110 , 111 and 112 , the transmittance of visible light of the fourth light leakage preventing 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 can have a higher level of light transmittance than other sub-pixels while preventing light leakage.

In addition, when the green light leakage component or the blue light leakage component generated by the second subpixel SP2 or the third subpixel SP3 is oriented toward the fourth subpixel SP4, the fourth light leakage preventing layer 113 absorbs the green light or the blue light, thereby Can prevent light leakage. The fourth light leakage preventing layer 113 selectively allows red light to pass therethrough, thereby being able to absorb light generated by the second subpixel SP2 or the third subpixel SP3.

In addition, the first light leakage preventing layer 110 may absorb the green light leakage component or the blue light leakage component generated by the second subpixel SP2 or the third subpixel SP3, and the second light leakage preventing layer 111 may absorb the green light leakage component generated by the first subpixel SP1 or the third subpixel SP3. The red light leakage component or the blue light leakage component generated by the three sub-pixels SP3, and the third light leakage preventing layer 112 can absorb the red light leakage component or the green light leakage component generated by the first sub-pixel SP1 or the second sub-pixel SP2.

Although the fourth light leakage preventing layer 113 has been shown in the configuration as described above to allow light of the same color as the light that the first light leakage preventing layer 110 allows to pass therethrough, the organic The light-emitting display device is not limited to this. Specifically, the color of the light that the fourth light leakage preventing layer 113 allows to pass therethrough may be the same as the color of the light that the second light leakage preventing layer 111 or the third light leakage preventing layer 112 allows to pass therethrough.

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

In addition, the first to fourth light leakage preventing layers 110 to 113 are not limited to the configurations shown above. Here, at least one light leakage preventing layer of the first to fourth light leakage preventing layers 110 to 113 allows the color of light to pass therethrough to be different from other light leakage preventing layers of the first to fourth light leakage preventing layers 110 to 113 The layers allow complementary colors of light passing through them.

For example, the first anti-leakage layer 110, the second anti-leakage layer 111, and the third anti-leakage layer 112 may allow light of different colors to pass therethrough, and the fourth anti-leakage layer 113 may allow and pass through the first anti-leakage layer to the Light of one or more colors of complementary colors of light of one of the three light leakage prevention layers 110 , 111 and 112 passes therethrough.

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

With this configuration, the fourth light leakage preventing layer 113 can prevent or reduce different subpixels or a Light leakage between different pixels. Specifically, the fourth light leakage preventing layer 113 allows light corresponding to the wavelength range of coordinates (0.35, 0.1) to (0.55, 3) in the 1931 CIE-xy color coordinate system to pass therethrough while absorbing light of other colors, thereby making Light leakage is minimized.

Since the fourth light leakage preventing layer 113 allows light in the wavelength range corresponding to the coordinates (0.35, 0.1) to (0.55, 3) in the 1931 CIE-xy color coordinate system to pass therethrough, the fourth light leakage preventing layer 113 can prevent or reduce Loss of light generated by the organic electroluminescence device EL provided in the fourth subpixel SP4. Specifically, since the low-efficiency absorption of blue light and red light is minimized, the luminous efficiency of the organic electroluminescence device EL in the fourth subpixel SP4 can be prevented from being lowered by the fourth light leakage preventing layer 113 .

Although the fourth light leakage preventing 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 organic light emitting The fourth light leakage preventing layer 113 of the display device 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 4 are provided 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 light leakage preventing layer 113, so the organic light emitting display device according to the first exemplary embodiment can prevent or reduce light leakage between different sub-pixels or between different pixels.

Furthermore, since the fourth light leakage preventing layer 113 allows the light (or the light of the wavelength range) of the color corresponding to the coordinates (0.35, 0.1) to (0.55, 3) in the 1931 CIE-xy color coordinate system to pass therethrough, according to the first The organic light emitting display device of the exemplary embodiment may prevent or reduce light leakage between different sub-pixels or between different pixels, while preventing a reduction in luminous 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 FIGS. 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 aforementioned embodiments. The description of some components will be omitted because they are the same as those of the foregoing embodiment. Furthermore, the same reference numerals or symbols will be used hereinafter to refer to the same or similar parts.

4 , the organic light emitting display device according to the 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 microlenses disposed in at least one light emitting region.

Specifically, each of the first to fourth subpixels includes first to fourth light emitting areas EA11 , EA21 , EA32 and EA41 . 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.

4, the first microlenses are arranged in the first light emitting area EA11, the second light emitting area EA21 and the fourth light emitting area EA41, while the second microlenses are arranged in the third light emitting area EA32. 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 connecting portions 202 , and each of the first connecting portions connects adjacent first concave portions 201 . The second microlens includes a plurality of second concave portions 301 and a plurality of second connecting portions 302 , and each of the second connecting portions connects adjacent first concave portions 301 .

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

Although the diameter D2 of the second concave portion 301 of the second microlens is shown to be smaller than the diameter D1 of the first concave portion 201 of the first microlens in FIGS. 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 employed.

This configuration will now be described in detail with reference to FIG. 5 . FIG. 5 is a cross-sectional view of the organic light emitting display device according to the second exemplary embodiment, taken along line C-D of FIG. 4 . 5, first microlenses having the same shape are arranged in the first light emitting area EA11, the second light emitting area EA21 and the fourth light emitting area EA41. A second microlens having a different shape from the first microlens is arranged in the third light emitting area EA32.

The diameter D2 of the second concave portion 301 of the second microlens may be smaller than the diameter D1 of the first concave portion 201 of the first microlens. The concave portion of the microlens is fitted into the cover layer 120 to improve the external light extraction efficiency, and the change of the optical path according to the shape of the concave portion of the microlens is a major factor for improving the light extraction efficiency. Therefore, the light efficiency may differ 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 arranged in the third light emitting area EA32 is smaller than that of the first microlenses arranged in the first light emitting area EA11, the second light emitting area EA21 and the fourth light emitting area EA41 The diameter D1 of the first concave portion 201 of the lens, so the frequency at which the light generated from the third light emitting area 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 electroluminescence device EL with low efficiency can be disposed can be further improved.

In addition, since the first to fourth light leakage prevention layers 110 to 113 are provided in the first to fourth subpixels SP1 , SP2 , SP3 and SP4 , it is possible to prevent or reduce the difference between different subpixels or between different pixels. of light leakage.

Hereinafter, an organic light emitting display device according to a third exemplary embodiment will be described with reference to FIGS. 6 and 7 . 6 is a plan view illustrating an organic light emitting display device according to a third exemplary embodiment, and FIG. 7 is a cross-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 aforementioned embodiments unless otherwise specified. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiment. Furthermore, the same reference numerals or symbols will be used hereinafter to refer to the same or similar parts.

6 and 7 , in the organic light emitting display device according to the third exemplary embodiment, at least one of the four light emitting areas EA11 , EA21 , EA33 and EA42 included in a single pixel P may have an undisposed area of the anti-leakage layer. In addition, at least one of the four light emitting areas EA11, EA21, EA33, and EA42 may have an area where microlenses are not provided.

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

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

In the first light emitting area EA11 and the second light emitting area 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 a microlens.

That is, in the third light emitting area EA33 and the fourth light emitting area EA42, the capping layer 220 may be formed to be flat. Therefore, 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 microlenses are provided in the fourth light emitting area EA42. Since the microlens is not provided in the fourth subpixel SP4 which is most susceptible to light leakage, it is possible to prevent the leakage light components generated by the subpixels that generate light of different colors from being extracted by the microlens provided in the fourth subpixel SP4 by This no light leakage component is visually perceived.

As described above, in order to prevent light leakage, no microlenses are provided in the fourth subpixel SP4, so that the configuration of the light leakage prevention layer in the fourth subpixel SP4 can be omitted.

Although a configuration in which neither a light leakage preventing layer nor a microlens is provided in the third light emitting area EA33 is shown in FIGS. 6 and 7 , the organic light emitting display device according to the third exemplary embodiment is not limited thereto. Specifically, neither the microlens nor the light leakage preventing layer may be provided not only in the fourth subpixel SP4 but also in one of the first to third subpixels SP1 , SP2 and SP3 .

Thereby, not only in the fourth sub-pixel but also in other sub-pixels susceptible to light leakage, light that would otherwise cause light leakage can be prevented from being extracted outward through the microlens.

Hereinafter, an organic light emitting display device according to a fourth exemplary embodiment will be described with reference to FIGS. 8 and 9 . 8 is a plan view illustrating an organic light emitting display device according to a fourth exemplary embodiment, and FIG. 9 is a cross-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 aforementioned embodiments unless otherwise specified. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiment. Furthermore, the same reference numerals or symbols will be used hereinafter to refer to the same or similar parts.

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

Specifically, the first to fourth sub-pixels respectively include a first light-emitting area EA12, a second light-emitting area EA21, a third light-emitting area EA33 and a fourth light-emitting area EA42. Microlenses are arranged in at least two of the first to fourth light emitting areas EA12 , EA21 , EA33 and EA42 . In 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. Also, a light leakage prevention layer and a microlens may be arranged in at least one light emitting area.

For example, the second microlenses are arranged in the first light emitting area EA12, the first microlenses are arranged in the second light emitting area EA21, and the microlenses are not arranged in the third light emitting area EA33 and the fourth light emitting area EA42. 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 the second microlenses in the first light emitting area EA12 per unit area is greater than the number of the first microlenses in the second light emitting area EA21 per unit area.

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

Hereinafter, an organic light emitting display device according to a fifth exemplary embodiment will be described with reference to FIGS. 10 and 11 . 10 is a plan view illustrating an organic light emitting display device according to a fifth exemplary embodiment, and FIG. 11 is a cross-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 aforementioned embodiments unless otherwise specified. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiment. Furthermore, the same reference numerals or symbols will be used hereinafter to refer to the same or similar parts.

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

The shape of the microlenses disposed in at least one light emitting area may be different from the shape of the microlenses disposed on the remaining light emitting areas. In some embodiments, the shape of the microlenses disposed in the 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.

Among the plurality of light emitting areas EA12, EA21, EA34, and EA42 included in the pixel P, microlenses are provided in at least one light emitting area, and no microlenses are provided in the remaining light emitting areas.

For example, microlenses are provided in the first light emitting area EA12, the second light emitting area EA21, and the third light emitting area EA34, while no microlenses are provided in the fourth light emitting area EA42.

A second microlens, a first microlens and a third microlens are provided in the first light emitting area EA12, the second light emitting area EA21 and the third light emitting area EA34, respectively. The shapes of the first to third microlenses are different from each other.

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

Therefore, the number of microlenses in the third light-emitting area EA34 per unit area is greater than the number of microlenses in the first light-emitting area EA12 per unit area, and the number of microlenses in the first light-emitting area EA12 per unit area is greater than The number of microlenses in the second light emitting area EA21 per unit area.

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

That is, the organic light emitting display device according to the fifth exemplary embodiment has microlenses of different shapes according to the efficiency of the electroluminescent device disposed in the light emitting region, so that the light emitting efficiency can 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 FIGS. 10 and 11 , but the present disclosure is not limited thereto, and may have any configuration in which at least one of the diameter, depth, FWHM, gap between adjacent recesses, slope, and aspect ratio of one of the first to third recesses is One is different from the corresponding one in the other recesses.

Hereinafter, an organic light emitting display device according to a sixth exemplary embodiment will be described with reference to FIGS. 12 and 13 . 12 is a plan view illustrating an organic light emitting display device according to a sixth exemplary embodiment, and FIG. 13 is a cross-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 aforementioned embodiments unless otherwise specified. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiment. Furthermore, the same reference numerals or symbols will be used hereinafter to refer to the same or similar parts.

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 areas EA11 , EA22 , EA31 and EA41 , wherein the first light emitting area EA11 , the third light emitting area Microlenses are arranged in EA31 and the fourth light emitting area EA41, while no microlenses are arranged in the second light emitting area EA22.

A first anti-leakage layer 110 , a second anti-leakage layer 111 , a third anti-leakage layer 112 and a fourth anti-leakage layer 113 are disposed on portions of the substrate 100 corresponding to the light-emitting areas EA11 , EA22 , EA31 , and EA41 .

When the electroluminescence device EL ( 530 , 540 , 550 ) for generating green light is disposed in the second light emitting area EA22 , the plurality of microlenses are disposed in the first light emitting area having a lower luminous efficiency than that of the second light emitting area EA22 In the light emitting area EA11, the third light emitting area EA31 and the fourth light emitting area EA41. Thereby, the luminous efficiency can be improved.

Hereinafter, an organic light emitting display device according to a seventh exemplary embodiment will be described with reference to FIGS. 14 and 15 . 14 is a plan view illustrating an organic light emitting display device according to a seventh exemplary embodiment, and FIG. 15 is a cross-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 aforementioned embodiments unless otherwise specified. Descriptions of some components will be omitted because they are the same as those of the foregoing embodiment. Furthermore, the same reference numerals or symbols will be used hereinafter to refer to the same or similar parts.

14 , the organic light emitting display device according to the seventh exemplary embodiment has microlenses arranged in each of a plurality of light emitting areas EA11 , EA21 , EA31 and EA43 included in a single pixel P. In addition, in the sub-pixels included in the single pixel P, the light leakage prevention layer may be disposed under the cover layer 320 including the microlenses.

In a single pixel P, the light leakage prevention layer provided in at least one subpixel may be formed of a material different from that of the light leakage prevention layer provided in the other subpixels. This can thus reduce the reflectivity of specific sub-pixels and reduce light leakage.

This configuration will now be described with reference to FIG. 15 . 15 , in the organic light emitting display device according to the seventh exemplary embodiment, the fourth light leakage preventing layer 210 provided in at least one subpixel of the plurality of subpixels of a single pixel may be formed of a light reflective material. In addition, the first to third light leakage preventing layers 110 , 111 and 112 provided in other subpixels of the plurality of subpixels in a single pixel allow red light, green light and blue light to pass therethrough, respectively.

Specifically, the insulating layer 200 is provided on the substrate 100 of the organic light emitting display device. The first to fourth light leakage preventing 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 SP4 . The first to third light leakage preventing layers 110 , 111 and 112 disposed in the first to third subpixels SP1 , SP2 and SP3 respectively allow red light, green light and blue light to pass therethrough. In addition, the fourth light leakage preventing layer 210 disposed in the fourth subpixel SP4 may reflect light.

The fourth light leakage preventing layer 210 disposed in the fourth subpixel SP4 may be composed of two or more layers. Specifically, the fourth light leakage prevention layer 210 disposed in the fourth sub-pixel 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 an inorganic insulating layer formed of one selected from, but not limited to, silicon nitride (SiN _x ) and silicon oxide (SiO ₂ ).

Since the fourth light leakage preventing layer 210 composed of two or more metal layers is disposed in the fourth subpixel SP4 as described above, light leakage components generated by subpixels other than the fourth subpixel SP4 can be passed through the fourth subpixel SP4. A metal layer 211 or a second metal layer 212 reflects to be reoriented toward the substrate 100 to reach a polarizer (not shown) disposed under the substrate 100 .

The leaked light component reflected by the first metal layer 211 or the second metal layer 212 is reoriented so 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 extract. That is, the light leakage components reoriented by the first metal layer 211 or the second metal layer 212 are trapped in the display device, so that the light leakage components are not visually perceived by the observer.

In other words, when the fourth light leakage preventing layer 210 is not provided in the fourth subpixel SP4, light leakage components generated by the remaining subpixels may be blocked at the boundary between the substrate 100 and the polarizer (not shown) Re-orientation to reach the microlens of the fourth sub-pixel SP4. Light that has reached the microlenses may be extracted from the substrate 100 by the microlenses, resulting in light leakage. That is, the microlens can convert the optical axis of the light that has reached the microlens to be coaxial with the optical axis of the polarizer (not shown), whereby the light can be extracted from the substrate 100 to be visually perceived by the observer.

In addition, when the external light 850 enters the fourth subpixel SP4 from the outside of the substrate 100 , the external light 850 may be reflected by the first metal layer 211 or the second metal layer 212 to be reoriented 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) provided on the bottom surface of the substrate 100 . Since the external light 850 cannot exit the display device, the reflectivity of the external light 850 can be reduced.

The first metal layer 211 may be formed of a material having a negative permittivity/permittivity or a negative permittivity. 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 the absolute value 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 beryllium (Be), calcium (Ca), barium (Ba), strontium (Sr), radium (Ra), Lithium (Li), Sodium (Na), and Magnesium (Mg).

The second metal layer 212 formed of 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 with high dielectric constant, the incident light can be absorbed by the metal layer or most of it can be lost due to non-emissive plasmonic modes, thereby reducing transmittance. According to the non-emissive plasmonic mode, light loss is caused by electron oscillation on the surface of the metal layer serving as a reflector and interference of wavelengths 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 placed in contact with each other, light is lost at the boundary between the insulating layer and the metal layer, thereby reducing transmittance.

In contrast, the fourth sub-pixel SP4 disposed between the insulating layer 200 and the second metal layer 212 is provided with the first metal layer 211 having a negative permittivity, and the permittivity of the first metal layer 211 is The absolute value 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 sub-pixel SP4. Therefore, the light generated by the electroluminescent device EL can be extracted outward from the substrate 100 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 permittivity and 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 a negative index of refraction allow light to pass therethrough without reflecting or absorbing incident light. Furthermore, 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 metal layer 211 and the second metal layer 212 may be in the range of 1 nm to 30 nm. Since the first metal layer 211 and the second metal layer 212 are formed thin, the transmittance of the fourth light leakage preventing layer 210 can be improved.

When the light generated by the electroluminescent device EL passes through the cover layer 320 and reaches the second metal layer 212 in the fourth light leakage preventing layer 210, a part of the light is reflected by the second metal layer 212, and the remaining part of the light is The first metal layer 211 is reached 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 outward from the substrate 100 through the first metal layer 211 .

Therefore, due to the insulating layer 200 provided on the substrate 100 and the first metal layer 211 and the second metal layer 212 provided on the insulating layer 200, it is possible to reduce the leakage light component and reflectivity, while the light generated by the electroluminescence device EL can be reduced The transmittance can be improved.

The configuration of the insulating layer 200 and the fourth light leakage preventing layer 210 provided in the fourth subpixel SP4 is not limited to the above-mentioned structure.

Hereinafter, an insulating layer and a fourth light leakage preventing layer provided in the fourth subpixel according to an alternative embodiment will be described with reference to FIG. 16 . FIG. 16 shows the structure of an insulating layer and a fourth light leakage preventing layer disposed in a fourth subpixel according to an alternative embodiment.

16 , in a display device according to an alternative embodiment, an insulating layer 300 is provided on portions of the substrate 100 corresponding to the first to third subpixels SP1 , SP2 and SP3 , and on the insulating layer 300 First to third light leakage preventing layers 110 , 111 , and 112 are provided.

A cover layer 420 including microlenses is provided on the first to third light leakage preventing layers 110 , 111 and 112 provided in the first to third subpixels SP1 , SP2 and SP3 . 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 .

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

The cover layer 420 including the microlenses is disposed on the insulating layer 300 of the fourth sub-pixel SP4 , and the electroluminescent device EL including the first electrode 430 , the organic light emitting layer 440 , and the 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 subpixels SP1 to SP4 may be determined based on the topography of the microlenses disposed on the capping layer 420 .

Each of the third metal layer 311 and the fourth metal layer 312 provided in the fourth subpixel SP4 may be composed of one or more layers. The third metal layer 311 may be formed of 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 whose absolute value is greater than the absolute value 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 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 metal layer 311 and the fourth metal layer 312 may be in the range of 1 nm to 30 nm. Since the third metal layer 311 and the fourth metal layer 312 are formed thin, the transmittance of the fourth light leakage preventing layer 310 can be improved.

As described above, in the fourth subpixel SP4 , the third metal layer 311 is provided on the substrate 100 , the fourth metal layer 312 is provided on the third metal layer 311 , and the insulating layer 300 is provided on the fourth metal layer 312 . This can thus reduce leakage light components and reflectivity, while increasing the transmittance of light generated by the organic electroluminescence device EL.

In the organic light emitting display device, any configuration can 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 having a negative dielectric constant (the absolute value of which is) A metal layer greater than the absolute value of the dielectric constant of the insulating layer) is disposed 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 will be compared with the reflectance reduction effect of the organic light emitting display device of the comparative example. FIG. 17 is a diagram showing the reflectance reduction effect of the organic light emitting display devices in the present embodiment and the comparative example.

Referring to FIG. 17 , an organic light emitting display device (comparative example) in which only a metal layer having a high level of reflectivity in each organic light emitting display device is provided as a light leakage preventing layer and the light leakage preventing layer of each organic light emitting display device including The organic light emitting display device (the present embodiment) in which the first metal layer and the second metal layer are stacked on each other is compared, wherein the first metal layer has a negative dielectric constant whose absolute value is greater than that of the insulating layer in contact with the light leakage prevention layer. the absolute value of the electrical constant, and the second metal layer has a higher level of reflectivity.

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

In an organic light emitting display device with microlenses, when external light is incident at a large angle (eg, an angle of 40° or more), the external light is diffused through the microlenses to be visually perceived by an observer. Therefore, as in the above-described embodiments, it is necessary to prevent the 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 a light leakage preventing layer or the like.

However, as shown in FIG. 17 , when external light is incident on the organic light emitting display device at a large angle (eg, an angle of 40° or more), it should be understood that the comparative example includes 5 nm and 10 nm formed of only silver (Ag) The organic light emitting display device of the light leakage prevention layer reflects about 5% to about 30% of external light. This means that the difference ratio of the optical axis of the external light incident to the display device and the optical axis of the polarizer is only about 5% to about 30%.

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

As described above, it should be understood that the amount of external light reflected by each light leakage preventing layer of the organic light emitting display device of the present embodiment is larger than that of each light leakage preventing layer of the organic light emitting display device of the comparative example. That is, by increasing 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, the optical axis of the external light is made different from the optical axis of the polarizer, thereby reducing the output Displays the amount of light from the 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 an anti-leakage layer disposed in a region corresponding to a light emitting region in at least one of a plurality of subpixels to prevent or reduce different subpixels or between different pixels leakage of light, while preventing a reduction in the extraction efficiency of light generated by organic electroluminescence (EL) devices.

Furthermore, 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 sub-pixel of the plurality of sub-pixels is not provided with a microlens , so that light extraction efficiency can be adjusted according to sub-pixels and light leakage can be prevented.

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

Although the 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 specific components of the exemplary embodiments.

The present 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 that generate light of different colors;

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

a cover layer disposed on a portion of the substrate corresponding to at least one sub-pixel 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.

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

the plurality of sub-pixels are divided into red sub-pixels, green sub-pixels, blue sub-pixels and white sub-pixels, and

The light leakage prevention layer includes a first light leakage prevention layer to a fourth light leakage prevention layer respectively disposed in the plurality of sub-pixels, and at least one light leakage prevention layer from the first light leakage prevention layer to the fourth light leakage prevention layer It is thinner than other light leakage preventing layers in the first light leakage preventing layer to the fourth light leakage preventing layer.

Aspect 3. The organic light emitting display device according to Aspect 2, wherein at least two light leakage preventing layers of the first to fourth light leakage preventing 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 light leakage prevention layer from the first light leakage prevention layer to the fourth light leakage prevention layer is allowed to pass through the first light leakage prevention layer to the fourth light leakage prevention layer. Light of at least one color complementary to light of at least one color of the remaining light leakage preventing layers in the fourth light leakage preventing layer passes therethrough.

Scheme 5. The organic light emitting display device according to scheme 2, wherein the microlens comprises a first microlens and a second microlens, and the second microlens is provided in the plurality of sub-pixels without the first microlens being provided In at least one sub-pixel of a microlens, the second microlens is the same as or different from the first microlens.

Item 6. The organic light emitting display device according to Item 5, wherein diameters, heights, half widths, slopes, and aspect ratios of the plurality of convex portions of the second microlenses, and the distance between adjacent convex portions At least one of the distances is different from a corresponding one of a diameter, a height, a full width at half maximum, a slope, and an aspect ratio of the plurality of convex portions of the first microlens, and a distance between adjacent convex portions.

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

Aspect 8. The organic light emitting display device according to Aspect 5, wherein the microlens further comprises a plurality of sub-pixels provided with neither the first microlens nor the second microlens. a third microlens in at least one sub-pixel, the third microlens being arranged to be the same as the first microlens or the second microlens or different from the first microlens and the second microlens .

Aspect 9. The organic light emitting display device according to Aspect 7, wherein diameters, heights, full widths at half maximums, slopes, and aspect ratios of the plurality of convex portions of the third microlenses, and the distance between adjacent convex portions At least one of the distances is different from the diameter, height, half width, slope, and aspect ratio of the plurality of convex portions of the first microlens or the second microlens, and the distance between adjacent convex portions counterpart in .

Item 10. The organic light emitting display device according to Item 7, wherein at least one of the diameter, depth, half width, slope, and aspect ratio of the plurality of recesses of the third microlens, and a distance between adjacent recesses a corresponding one of diameter, depth, half-peak width, slope and aspect ratio of the plurality of recesses, and distance between adjacent recesses, of the first microlens and the second microlens.

Aspect 11. The organic light emitting display device according to Aspect 1, wherein the plurality of sub-pixels are divided into red sub-pixels, green sub-pixels, blue sub-pixels, and white sub-pixels, and the red sub-pixels, the green sub-pixels The light leakage prevention layer is not provided in at least one of the pixel, the blue sub-pixel and the white sub-pixel.

Aspect 12. The organic light emitting display device according to Aspect 11, wherein the light leakage prevention layer is not provided in the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel The microlens is not provided in the at least one sub-pixel of .

Aspect 13. The organic light emitting display device according to Aspect 12, wherein the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel are not provided with the light leakage prevention layer. The at least one sub-pixel not provided with the microlens is a white sub-pixel.

Aspect 14. The organic light emitting display device of aspect 1, wherein the microlens is not disposed in at least one subpixel of the plurality of subpixels.

Aspect 15. The organic light emitting display device according to aspect 1, wherein the light leakage prevention layer disposed in the at least one sub-pixel of the plurality of sub-pixels includes a first metal layer and a second metal layer or includes a first metal layer and a second metal layer. Three metal layers and a fourth metal layer.

Item 16. The organic light-emitting display device according to Item 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 subpixel of the plurality of subpixels, the first metal layer disposed on the insulating layer and including one or more The second metal layer is disposed on the first metal layer and includes one or more vias.

Item 17. The organic light emitting display device according to Item 16, wherein the dielectric constant of the first metal layer is negative, and the absolute value of the dielectric constant of the first metal layer is greater than the dielectric constant of the insulating layer The absolute value of the constant is large.

Item 18. The organic light emitting display device of Item 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 The 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) .

Item 19. The organic light-emitting display device according to Item 15, comprising:

the third metal layer in the at least one subpixel of the plurality of subpixels disposed on the substrate;

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

an insulating layer disposed on the fourth metal layer.

Item 20. The organic light emitting display device according to item 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 dielectric constant of the insulating layer The absolute value of the constant is large.

Item 21. The organic light emitting display device of Item 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 the group consisting of silver (Ag), aluminum (Al), and gold (Au) The 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) .

Item 22. The organic light emitting display device of Item 19, wherein in remaining sub-pixels of the plurality of sub-pixels different from the at least one sub-pixel, the insulating layer is disposed on the substrate, and the an anti-light leakage layer is arranged on the insulating layer,

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

Aspect 23. The organic light emitting display device according to aspect 1, wherein the light leakage prevention layer comprises at least one of the following: an I-type light leakage prevention layer, the I type light leakage prevention layer configured to allow light of a specific wavelength to pass therethrough Simultaneously absorbs the remaining wavelengths of light; a Type II light-leakage prevention layer configured to allow specific wavelengths of light to pass therethrough while absorbing a portion of the visible light to allow the remaining visible light to pass therethrough; and a Type III light-leakage prevention layer, so The Type III anti-leakage layer is configured to allow light to pass therethrough or to be reflected while changing the optical axis of the light, the light having the changed optical axis can then be absorbed by the polarizer.

Aspect 24. The organic light emitting display device of aspect 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.

Item 25. The organic light emitting display device according to item 23, wherein the I-type light leakage prevention layer selectively allows light of a specific color to pass therethrough while absorbing light of remaining wavelengths, whereby most of the specific color passes therethrough At the same time most of the remaining wavelengths of light are absorbed.

Item 26. The organic light emitting display device according to item 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 (20)

1. a kind of organic light-emitting display device, comprising:

Substrate；

Pixel, the pixel are arranged on the substrate and including multiple sub-pixels；

Coating on the substrate is set, and the coating includes lenticule；

It is arranged in the supratectal Organnic electroluminescent device；

Dyke pattern, the dyke pattern are arranged on the coating and are configured to limit the hair of the multiple sub-pixel Light area；And

The filter layer being separately positioned in each of the multiple sub-pixel sub-pixel,

Wherein some sub-pixels in the multiple sub-pixel include both lenticule and corresponding filter layer, the multiple sub- picture Remaining sub-pixel in element only includes the filter layer.

2. organic light-emitting display device according to claim 1, wherein each filter layer allows the light of different colours therefrom Pass through.

3. organic light-emitting display device according to claim 2, it is provided with one a little in the multiple sub-pixel The lenticule in pixel has configurations differing from one.

4. organic light-emitting display device according to claim 2, described one be provided in the multiple sub-pixel The number of the lenticule of per unit area in a little pixel is different from each other.

5. organic light-emitting display device according to claim 2, in which:

The pixel includes red sub-pixel, green sub-pixels and blue subpixels,

Some sub-pixels in the multiple sub-pixel include the red sub-pixel and the green sub-pixels, and

The remaining sub-pixel in the multiple sub-pixel includes the blue subpixels.

6. organic light-emitting display device according to claim 5, wherein the pixel further includes white sub-pixels, and

Wherein the white sub-pixels include the lenticule.

7. organic light-emitting display device according to claim 6, wherein the white sub-pixels further include the filter layer.

8. organic light-emitting display device according to claim 7 is provided with the filter in the white sub-pixels Photosphere is thinner than the filter layer being arranged in the red sub-pixel, the green sub-pixels and the blue subpixels.

9. a kind of organic light-emitting display device, comprising:

Substrate；

Pixel on the substrate is set, and the pixel includes red sub-pixel, green sub-pixels and blue subpixels；

Filter layer, the filter layer are separately positioned on the red sub-pixel, the green sub-pixels and the blue subpixels Each sub-pixel in；

Coating, the coating are arranged on the filter layer and including lenticule；

It is arranged in the supratectal Organnic electroluminescent device；And

Dyke pattern, the dyke pattern are arranged on the coating and are configured to limit the red sub-pixel, institute The luminous zone of green sub-pixels and the blue subpixels is stated,

Wherein each of the red sub-pixel and the green sub-pixels sub-pixel include being arranged in the organic electroluminescence The lenticule between light emitting device and the substrate, and the filter being arranged between the lenticule and the substrate Photosphere, and

Wherein the blue subpixels include the optical filtering being arranged between the Organnic electroluminescent device and the substrate Layer.

10. organic light-emitting display device according to claim 9 is provided in the red sub-pixel, the green The filter layer in sub-pixel and the blue subpixels allows the light of different colours to pass therethrough.

11. organic light-emitting display device according to claim 9 is provided in the red sub-pixel and the green The number of the lenticule of per unit area in sub-pixel is different from each other.

12. organic light-emitting display device according to claim 9, wherein the pixel further includes white sub-pixels, and

Wherein the white sub-pixels include be arranged in it is described micro- between the Organnic electroluminescent device and the substrate Mirror.

13. organic light-emitting display device according to claim 12, wherein the white sub-pixels further include the optical filtering Layer.

14. organic light-emitting display device according to claim 13, be provided in the white sub-pixels described in Filter layer is thinner than the filter layer being arranged in the red sub-pixel, the green sub-pixels and the blue subpixels.

15. a kind of organic light-emitting display device, comprising:

Substrate；

Pixel on the substrate is set, and the pixel includes first group and second group, and described first group has multiple sub- pictures Some sub-pixels in element, described second group with the remaining sub-pixel in the multiple sub-pixel；

Filter layer at least one sub-pixel in the multiple sub-pixel is set；

Coating on the substrate is set；

It is arranged in the supratectal Organnic electroluminescent device；And

Dyke pattern, the dyke pattern are arranged on the coating and are configured to limit the hair of the multiple sub-pixel Light area,

Wherein the coating includes the lenticule in each sub-pixel in the sub-pixel for be arranged in described first group, with And the flat surfaces in described second group of the sub-pixel are set.

16. organic light-emitting display device according to claim 15, wherein the pixel includes red sub-pixel, green Pixel and blue subpixels, described first group includes the red sub-pixel and the green sub-pixels, and described second group Including the blue subpixels,

Wherein each of the red sub-pixel and the green sub-pixels sub-pixel include being arranged in the organic electroluminescence The lenticule between light emitting device and the substrate, and the filter being arranged between the lenticule and the substrate Photosphere, and

Wherein the blue subpixels include the filter layer being arranged between the flat surfaces of the coating and the substrate.

17. organic light-emitting display device according to claim 16 is provided in the red sub-pixel, the green The filter layer in sub-pixel and the blue subpixels allows the light of different colours to pass therethrough.

18. organic light-emitting display device according to claim 16, it is provided in the red sub-pixel and described green The number of the lenticule of per unit area in sub-pixels is different from each other.

19. organic light-emitting display device according to claim 16, wherein described first group further include have it is described micro- The white sub-pixels of mirror and the filter layer.

20. organic light-emitting display device according to claim 19, be provided in the white sub-pixels described in Filter layer is thinner than the filter layer being arranged in the red sub-pixel, the green sub-pixels and the blue subpixels.