TWI713213B - Organic light-emitting display device - Google Patents

Abstract

An organic light-emitting display device, wherein a substrate is divided into a plurality of subpixels generating different colors of light. A light leakage prevention layer is disposed on a portion of the substrate corresponding to a light-emitting area of at least one subpixel of the plurality of subpixels. An overcoat layer is disposed on a portion of the substrate corresponding to at least one subpixel of the plurality of subpixels, and includes microlenses having a plurality of concave portions or a plurality of convex portions. An organic electroluminescent device is disposed on the overcoat layer.

Description

Organic light emitting display device

The present invention relates to an organic light emitting display device, and in particular, the present invention relates to an organic light emitting display device capable of preventing light leakage.

The organic light emitting display device can be made relatively light and thin because it uses an organic electroluminescence (EL) device or an organic light emitting diode (OLED) capable of self-luminescence, and does not need to use a separate light source. In addition, organic light emitting display devices are not only advantageous in terms of power consumption because they are driven at low voltages, but also have desired performance, such as the ability to achieve a certain color range, fast response rate, and wide viewing angle. And high contrast. Therefore, organic light emitting display devices for next-generation displays have been actively researched.

The light generated by the organic light emitting layer of an organic light emitting display device is emitted from the organic light emitting display device through several components of the organic light emitting display device. However, a part of the light generated by the organic light-emitting layer may not be able to leave the organic light-emitting display device and may be trapped in the organic light-emitting display device, resulting in a problem of low light extraction efficiency in the organic light-emitting display device.

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

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

When the microlens array (MLA) is disposed on the outside of one of the substrates of the organic light emitting display device or the microlens is formed on the cover layer, the light generated by the organic light emitting layer reaches the polarizer through the substrate, and then is reflected from the polarizer to be directed to the Substrate. Here, a part of the light traveling toward the substrate may reach the microlens of adjacent pixels on which light of different colors is generated, thereby causing light leakage, which is problematic.

Therefore, different aspects of the present invention provide an organic light emitting display device, which can prevent light leakage while improving light extraction efficiency.

In one aspect of the present invention, 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 sub-pixels On a part corresponding to a light-emitting area of the sub-pixel; a covering layer is provided on a part of the substrate corresponding to at least one of the sub-pixels, and includes a plurality of concave portions or a plurality of convex portions The microlens; and an organic electroluminescence device, arranged on the cover layer.

In at least some embodiments of the present invention, these sub-pixels can be divided into red, green, blue, and white sub-pixels. The light leakage prevention layer may include first to fourth light leakage prevention layers respectively provided in these sub-pixels. At least two of the first to fourth light leakage prevention layers may allow light of the same color to pass through. Alternatively, at least one light leakage prevention layer of the first to fourth light leakage prevention layers allows light of at least one color complementary to light of at least one color passing through the remaining light leakage prevention layers of the first to fourth light leakage prevention layers to pass .

These microlenses may include a plurality of first microlenses and a plurality of second microlenses, wherein the second microlens is arranged in at least one of the subpixels not provided with the first microlens, and the second microlens Same as or different from the first micro lens. These microlenses may further include a plurality of third microlenses, and the third microlenses are the same as the first microlenses or the second microlenses or are different from the first microlenses and the second microlenses.

In some embodiments of the present invention, in the organic light-emitting display device, the light leakage prevention layer may not be provided in at least one of these sub-pixels. The first microlens may not be provided in at least one of these sub-pixels.

According to the present invention as described above, the organic light-emitting display device includes an area corresponding to a light-emitting area in at least one of the plurality of sub-pixels, so as to prevent or reduce different sub-pixels or different sub-pixels. Light leaks between pixels while preventing the reduction of the extraction efficiency of light generated by an organic electroluminescence (EL) device.

In addition, in the organic light emitting display device according to the present invention, each pixel of the plurality of pixels includes a plurality of sub-pixels, wherein the sub-pixels are provided with different microlenses or at least one sub-pixel of the sub-pixels There is no micro lens, so the light extraction efficiency can be adjusted according to the sub-pixels and light leakage can be prevented.

Reference will now be made in detail to the embodiments of the present invention, some examples of which are shown in the drawings. The embodiments set forth herein are for the purpose of providing description, so as to fully convey the concept of the present invention to those skilled in the art. The present invention should not be construed as being limited to these embodiments, and can be implemented in many different forms. In the drawings, the size and thickness of the device may be enlarged for clarity. In this document, the same reference numerals and signs will be used to denote the same or similar components.

With reference to the drawings and the detailed description of the embodiments, the advantages and features of the present invention and its implementation methods will be apparent. The present invention should not be construed as being limited to the embodiments set forth herein, and may be implemented in many different forms. On the contrary, these embodiments are provided so that the present invention will be more thorough and complete, and will better convey the scope of the present invention to those skilled in the art. The scope of the present invention will be defined by the scope of the attached patent application. In this document, the same reference numerals and signs will be used to denote the same or similar components. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

It should 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 also can be "indirectly" through an "intermediate" element or layer. Located on" another element or layer. On the contrary, when an element or layer is referred to as being "directly on" another element or layer, it should be understood that there is no intervening element or layer.

Spatial relative terms such as "below", "below", "below", "bottom", "above", and "top" can be used in this text to facilitate the description of elements or components shown in the drawings. Relationship with another element or other component. Spatial relative terms should be interpreted as terms that include different orientations of elements in use or operation in addition to the orientation depicted in the drawings. For example, when the element shown in the drawing is turned over, an element described as being “below”, “below”, or “below” another element will be oriented to be “above” the other element. Therefore, the exemplary terms "below", "below", or "below" can include both an orientation of above and below.

In addition, terms such as "first", "second", "A", "B", "(a)", and "(b)" can be used herein to describe components. However, it should be understood that these terms are only used to distinguish one component from another component, and the substance, order, sequence or number of the components are not limited by these terms.

Fig. 1 is a block diagram schematically showing a display device according to an exemplary embodiment of the present invention. 1, a display device 1000 according to an exemplary embodiment of the present invention includes: a display panel 1100 on which a plurality of first lines VL1 to VLm are arranged along a first direction, that is, a vertical direction in the drawing , And along a second direction, that is, a horizontal direction in the figure, a plurality of second lines HL1 to HLn are arranged; a first driving circuit 1200 provides a first signal to the first lines VL1 to VLm; a second The driving circuit 1300 provides a second signal to the second lines HL1 to HLn; and a timing controller 1400 for controlling the first driving circuit 1200 and the second driving circuit 1300.

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

Each of the first driving circuit 1200 and the second driving circuit 1300 may include at least one driver integrated circuit (IC) to output image display signals.

The first lines VL1 to VLm arranged on the display panel 1100 in the first direction may be, for example, data lines arranged in the vertical direction to transmit the data voltage (ie, the first signal) to the pixel rows arranged in the vertical direction ( column). The first driving circuit 1200 may be a data driving circuit that supplies the data voltage to the data line.

In addition, the second lines HL1 to HLn arranged on the display panel 1100 in the second direction may be, for example, gate lines arranged in the horizontal direction to transmit the scan signal (ie, the second signal) to the gate lines arranged in the horizontal direction. Pixel column (row). The second driving circuit may be a gate driver that supplies the scan signal to the gate line.

The display panel 1100 has pads provided thereon, and these pads allow the display panel 1100 to be connected to the first driving circuit 1200 and the second driving circuit 1300. When the first driving circuit 1200 supplies the first signal to the first lines VL1 to VLm, the pad transmits the first signal to the display panel 1100. In the same way, when the second driving circuit 1300 supplies the second signal to the second lines HL1 to HLn, the pad transmits 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 invention is not limited thereto.

In the display panel, an electrode connected to a thin film transistor (TFT) that controls each sub-pixel to generate light is called a first electrode, and is arranged on the front surface of the display panel or covers two or more An electrode of a pixel is called a second electrode. When the first electrode system is an anode, the second electrode system is a cathode, and vice versa. Hereinafter, the first electrode will be referred to as an anode and the second electrode will be referred to as a cathode, but the present invention is not limited thereto.

According to the structure of the electroluminescence device, the organic light emitting display device can be classified into a top emission type or a bottom emission type. Although the following embodiments of the present invention are described as bottom emission type organic light emitting display devices, the present invention is not limited thereto.

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

Hereinafter, an embodiment of the scattering layer will be described with respect to the micro lens array. However, the exemplary embodiment of the present invention is 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 of the present invention will be described with reference to FIG. 2. FIG. 2 is a plan view showing an organic light emitting display device according to the first exemplary embodiment of the present invention.

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

These sub-pixels (for example, four sub-pixels) respectively include light-emitting areas EA11, EA21, EA31, and EA41. For example, the first sub-pixel includes the first light-emitting area EA11, the second sub-pixel includes the second light-emitting area EA21, the third sub-pixel includes the third light-emitting area EA31, and the fourth sub-pixel includes the fourth light-emitting area. Area EA41.

Although the first to fourth light-emitting regions EA11, EA21, EA31, and EA41 may be regions from which red (R), green (G), blue (B), and white (W) light wavelength ranges are emitted, the present The exemplary embodiments of the invention are not limited thereto. On the contrary, it can be realized that at least two of the four light-emitting areas EA11, EA21, EA31, and EA41 emit different colors from the red (R), green (G), blue (B), and white (W) described above The structure of light.

A plurality of micro lenses 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 shape, for example, a conical shape having a cross section defined by a straight line, a curve, or a parabola. Microlenses can improve the extraction efficiency of external light from organic electroluminescence (EL) devices. These microlenses include a plurality of first concave portions 201 and a plurality of first connecting portions 202 formed in the covering layer 120, and each first connecting portion 202 connects adjacent first concave portions 201.

Microlenses having the same shape are provided 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 of the present invention taken along the line A-B in FIG. 2. As shown in FIG. 3, the organic light emitting display device according to the first exemplary embodiment of the present invention includes first to fourth sub-pixels SP1, SP2, SP3, and SP4.

When the light generated by the organic electroluminescence (EL) device travels toward the substrate 100, a part of the light may reach the microlens of an adjacent sub-pixel or the microlens of another adjacent pixel that generates light of different colors, resulting in light leakage. In particular, when a display device is provided with sub-pixels without color filters, a significant amount of leakage light components generated by other sub-pixels can reach the microlenses of the sub-pixels without color filters to be visually recognized . In particular, when a color filter is not provided in a white (W) sub-pixel, the leaked light component generated by another sub-pixel may reach the microlens of the white sub-pixel for visual perception by the viewer, This is problematic.

In order to overcome this problem, the organic light emitting display device according to the first exemplary embodiment of the present invention includes first to fourth light leakage prevention layers 110, 111, 112, and 113, and first to fourth light leakage prevention layers 110, 111 , 112, and 113 are disposed on the substrate 100 divided into the first to fourth sub-pixels SP1 to SP4. More generally, the light leakage prevention layer prevents or substantially reduces at least a part of the light generated in the sub-pixels from reaching adjacent sub-pixels, so as to prevent or substantially reduce the number of different sub-pixels. A layer of light leaks. According to some embodiments of the present invention, a light leakage prevention layer may include different types of light leakage prevention layers. In some embodiments of the present invention, the light leakage prevention layer may include at least one of the following three light leakage prevention layers: an I-type light leakage prevention layer configured to allow light of a specific wavelength to pass through while absorbing light of the remaining wavelengths; Type II anti-light leakage layer, configured to allow light of a specific wavelength to pass, while absorbing part of visible light to allow the rest of the visible light to pass; a type III anti-light leakage layer, configured to allow light to pass or reflect while changing the optical axis of the light , The light with the changed optical axis is then absorbed by the polarizer. In an embodiment of the present invention, the I-type light leakage prevention layer selectively allows light of a specific color to pass through, while absorbing light of the remaining wavelengths, so that the main part (for example, at least 60%) of the specific color passes through it, And absorb a major part (for example, at least 60%) of light of the remaining wavelengths. In an embodiment of the present invention, a type III light leakage prevention layer allows light to pass through or reflect while changing the optical axis of the light by at least 50%. In particular, the first light leakage prevention layer 110 is provided on the first sub-pixel SP1, the second light leakage prevention layer 111 is provided on the second sub-pixel SP2, and the third light leakage prevention layer 112 is provided on the third sub-pixel. On the pixel SP3, and the fourth light leakage prevention layer 113 is provided on the fourth sub-pixel SP4.

The cover layer 120 is disposed on the substrate 100 including the first to fourth light leakage prevention layers 110 to 113. The organic electroluminescence device EL having 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 correspond to the microlenses in the cover layer 120 to improve the external light extraction efficiency in the first to fourth light emitting regions EA11, EA21, EA31, and EA41. The first to fourth light emitting regions EA11, EA21, EA31, and EA41 are defined by a bank pattern 160 configured to expose a predetermined portion of the top surface of the first electrode 130.

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

The first to fourth light leakage prevention layers 110 to 113 are disposed in regions corresponding to the light emitting regions EA11, EA21, EA31, and EA41 of the first to fourth sub-pixels SP1 to SP4. With this configuration, the organic light emitting display device according to the first exemplary embodiment of the present invention can prevent or reduce light leakage between different sub-pixels. Here, the first to fourth light leakage prevention layers 110 to 113 may allow light of a specific wavelength to pass through, while absorbing light of the remaining wavelengths. In addition, at least one light leakage prevention layer of the first to fourth light leakage prevention layers 110 to 113 is thinner than other light leakage prevention layers, so as to increase the light transmittance as compared with other light leakage prevention layers. The light rate is higher.

The principle of preventing light leakage will be described in detail below by using the first to fourth light leakage prevention layers 110 to 113. The refractive index of the first electrode 130 and the organic light emitting layer 140 of the organic electroluminescence device EL may be higher than the refractive index of the substrate 100 and the cover layer 120. For example, the refractive index of the substrate 100 and the cover layer 120 is about 1.5, and the refractive index of the first electrode 130 and the organic light emitting layer 140 of the organic electroluminescence device EL is in the range of 1.7 to 2.0.

A part of the light 800 generated by the organic light emitting layer 140 is reflected from the second electrode 150 and redirected to the first electrode 130, while the remaining part of the light generated by the organic light emitting layer 140 is emitted toward the first electrode 130. In other words, most of the light generated by the organic light emitting layer 140 is directed toward the first electrode 130.

Because the refractive index of the organic light emitting layer 140 is approximately equal to the refractive index of the first electrode 130, the path of light generated by the organic light emitting layer 140 does not change at the boundary of the organic light emitting layer 140 and the first electrode 130. Due to the difference in refractive index between the first electrode 130 and the cover layer 120, when incident at an angle equal to or greater than a threshold angle, the light that has passed through the first electrode 130 can pass between the first electrode 130 and the cover layer 120. Total reflection at the boundary between.

In this case, the light totally reflected at the boundary between the first electrode 130 and the cover layer 120 is reflected again from the second electrode 150, passes through the organic light emitting layer 140 and the first electrode 130, and then passes through the refractive index of The substrate 100 with substantially the same refractive index of the cover layer 120 reaches the polarizer (not shown) provided on the back surface of the substrate 100. Then, the light is reflected from the polarizer (not shown) and redirected to the substrate 100.

In addition, in the organic light emitting display device according to the first exemplary embodiment of the present invention, the first to fourth light leakage prevention layers 110 to 113 are provided on the substrate 100, and more specifically, are provided corresponding to the light emitting regions EA11, EA21. , EA31, and EA41 are used to prevent light from traveling at an angle greater than the total reflection threshold angle to reach an adjacent sub-pixel or a micro lens of another pixel.

Specifically, a portion of the light 800 generated by the organic light emitting layer 140 is totally reflected at the boundary between the first electrode 130 and the cover layer 120, and then reflected from the second electrode 150 to be redirected to the substrate. In this case, a part of the light 800 traveling at an angle smaller than the total reflection threshold angle passes through the cover layer 120 and the substrate 100, and then is reflected again at the boundary between the substrate 100 and the polarizer (not shown). Redirect to the substrate 100.

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

Since the first to fourth light leakage preventing layers 110 to 113 according to the present embodiment of the present invention are characterized by allowing light of a specific wavelength to pass through and absorbing light of the remaining wavelengths, the first to fourth light leakage preventing layers 110 to 113 It is possible to allow light of a specific wavelength in the leaked light component to pass, while absorbing light of the remaining wavelength in the leaked light component. For example, when the fourth light leakage prevention layer 113 that allows blue (B) light to pass is provided in the fourth sub-pixel SP4, the fourth light leakage prevention layer 113 allows the leakage light component having the blue wavelength range to pass , While absorbing light with the remaining wavelength range. In this case, blue light can be emitted from the fourth sub-pixel SP4. In the case of a display device in which the efficiency of blue light is low, this can therefore compensate for blue light.

Alternatively, at least two of the first to fourth light leakage prevention layers 110 to 113 may allow light rays of the same color to pass. For example, the first light leakage prevention layer 110, the second light leakage prevention layer 111, and the third light leakage prevention layer 112 allow light of different colors to pass through, while the fourth light leakage prevention layer 113 allows the light to pass through. The light leakage prevention layers 110, 111, and 112 allow light rays of the same color to pass through.

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

When the first light leakage prevention layer 110 and the fourth light leakage prevention layer 113 allow light of the same color to pass, and a leakage light component generated by the second sub-pixel SP2 or the third sub-pixel SP3 is directed toward the fourth sub-pixel In the SP4 orientation, the leakage light component is absorbed by the fourth light leakage prevention layer 113. This can prevent light leakage between different sub-pixels or between different pixels. In addition, since the fourth light leakage prevention layer 113 is provided to be thinner than any one of the first to third light leakage prevention layers 110, 111, and 112, the visible light transmittance of the fourth light leakage prevention layer 113 is Can be relatively higher. Since the fourth sub-pixel SP4 is provided with a relatively thin fourth light leakage prevention layer 113, the fourth sub-pixel SP4 can have a higher light transmittance level than other sub-pixels, and can prevent light leakage at the same time .

In addition, when a green or blue leakage light component generated by the second sub-pixel SP2 or the third sub-pixel SP3 is directed to the fourth sub-pixel SP4, the fourth light leakage prevention layer 113 absorbs the green or blue light, thereby Can prevent light leakage. The fourth light leakage prevention layer 113 selectively allows red light to pass through, thereby being able to absorb the light generated by the second sub-pixel SP2 or the third sub-pixel SP3.

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

Although in the above configuration, the fourth light leakage prevention layer 113 is shown to allow light rays of the same color as the light rays allowed by the first light leakage prevention layer 110 to pass through, the light emitting display device according to the first exemplary embodiment of the present invention is not limited to this. On the contrary, the fourth light leakage prevention layer 113 may allow the light of the same color as that of the second or third light leakage prevention layer 111 or 112 to pass through.

Since the light generated by different sub-pixels or different pixels is absorbed by the light leakage prevention layer as described above, it is possible to prevent or reduce light leakage from an organic light emitting display device having a plurality of microlenses.

In addition, the first to fourth light leakage prevention layers 110 to 113 are not limited to the above structure. Here, the color of light allowed to pass through at least one of the first to fourth light leakage prevention layers 110 to 113 may be the same as that allowed to pass through other light leakage prevention layers of the first to fourth light leakage prevention layers 110 to 113. The light colors are complementary.

For example, the first light leakage prevention layer 110, the second light leakage prevention layer 111, and the third light leakage prevention layer 112 may allow light of different colors to pass through, and the fourth light leakage prevention layer 113 may allow light to pass through. One of the third light leakage prevention layers 110, 111, and 112 allows light of one or more colors of complementary colors to pass through.

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

With this arrangement, the fourth light leakage prevention layer 113 can transmit and absorb the red, green, or blue light leakage components generated by the first to third sub-pixels SP1, SP2, and SP3 to prevent or reduce different sub-pictures. Light leakage between pixels or different pixels. Specifically, the fourth light leakage prevention layer 113 allows a light wavelength range corresponding to coordinates (0.35,0.1) to (0.55,3) in the 1931 CIE-xy color coordinate system to pass through, while absorbing other colors of light to minimize Light leakage.

Since the fourth light leakage prevention layer 113 allows a light wavelength range corresponding to the coordinates (0.35, 0.1) to (0.55, 3) in the 1931 CIE-xy color coordinate system to pass, the fourth light leakage prevention layer 113 can prevent or The light loss caused by the organic electroluminescence device EL provided in the fourth sub-pixel SP4 is reduced. In particular, since the absorption of inefficient blue and red light is minimized, it is possible to prevent the luminous efficiency of the organic electroluminescent device EL in the fourth sub-pixel SP4 from being degraded due to the fourth light leakage prevention layer 113.

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

As described above, the organic light emitting display device according to the first exemplary embodiment of the present invention can prevent or reduce light leakage between different sub-pixels or between different pixels because the first to fourth light leakage prevention layers 110 to 113 are provided In the regions corresponding to the first to fourth sub-pixels SP1 to SP4 to the first to fourth light-emitting regions EA11, EA21, EA31, and EA41.

In addition, in the organic light emitting display device according to the first exemplary embodiment of the present invention, since the fourth light leakage prevention layer 113 is allowed to correspond to the coordinates (0.35, 0.1) to (0.55, 3) in the 1931 CIE-xy color coordinate system The light color (or light wavelength range) of) passes through, so it can prevent or reduce light leakage between different sub-pixels or different pixels, and prevent the luminous efficiency of the organic electroluminescence device from deteriorating.

Hereinafter, an organic light emitting display device according to a second exemplary embodiment of the present invention will be described with reference to FIGS. 4 and 5. 4 is a plan view showing an organic light emitting display device according to a second exemplary embodiment of the present invention.

The organic light emitting display device according to the second exemplary embodiment of the present invention may include the same components as the foregoing embodiment. The description of some components will be omitted because they are the same as the components of the foregoing embodiment. In addition, in the following, the same reference numerals or signs will be used to denote the same or similar components.

4, in addition to the shape of the microlens provided in at least one light-emitting area, the organic light-emitting display device according to the second exemplary embodiment of the present invention and the organic light-emitting display device according to the first exemplary embodiment of the present invention Roughly the same.

Specifically, each of the first to fourth sub-pixels includes first to fourth light-emitting areas EA11, EA21, EA32, and EA41. The shape of the microlens provided in at least one of the first to fourth light emitting areas EA11, EA21, EA32, and EA41 may be different from the shape of the microlens provided on the remaining light emitting areas.

Referring to FIG. 4, the first microlens is disposed in the first light-emitting area EA11, the second light-emitting area EA21, and the fourth light-emitting area EA41, and the second microlens is disposed 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 first connecting portion 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 second connecting portion connects adjacent second concave portions 301.

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

Although in FIGS. 4 and 5, 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, according to the second exemplary embodiment of the present invention The embodiment is not limited to this. Any structure in which the shape of the first recess 201 is different from the shape of the second recess 301 may be adopted.

This configuration will now be described in detail with reference to FIG. 5. FIG. 5 is a cross-sectional view of the organic light emitting display device according to the second exemplary embodiment of the present invention taken along line C-D in FIG. 4. Please refer to FIG. 5, the first microlenses having the same shape are disposed in the first, second, and fourth light-emitting areas EA11, EA21, and EA41. A second microlens having a different shape from the first microlens is disposed 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 micro lens is assembled into the cover layer 120 to improve the extraction efficiency of external light, and the change of the optical path depending on the shape of the concave portion of the micro lens is the main factor to improve the light extraction efficiency. Therefore, the optical efficiency may vary according to the diameter (D) of the concave portion of the microlens.

Specifically, since the diameter D2 of the second concave portion 301 of the second microlens disposed in the third light-emitting area EA32 is smaller than that of the first microlens disposed in the first, second, and fourth light-emitting areas EA11, EA21, and EA41 Since the diameter D1 of the first concave portion 201, the frequency of the light generated from the third light-emitting area EA32 of the organic electroluminescent device EL reaching the microlens structure can be increased. Therefore, the light extraction efficiency of the sub-pixels in which the organic electroluminescence device EL with low efficiency can be provided 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 sub-pixels SP1, SP2, SP3, and SP4, it is possible to prevent or reduce different sub-pixels or between different pixels. The light leaks.

Hereinafter, an organic light emitting display device according to the third exemplary embodiment of the present invention will be described with reference to FIGS. 6 and 7. 6 is a plan view showing an organic light-emitting display device according to the third exemplary embodiment of the present invention, and FIG. 7 is a view of the organic light-emitting display device according to the third exemplary embodiment of the present invention taken along line EF in FIG. 6 Sectional view.

Unless otherwise specified, the organic light emitting display device according to the third exemplary embodiment of the present invention may include the same components as the foregoing embodiments. The description of some components will be omitted because they are the same as the components of the foregoing embodiment. In addition, in the following, the same reference numerals or signs will be used to denote the same or similar components.

6 and 7, in the organic light emitting display device according to the third exemplary embodiment of the present invention, at least one of the four light emitting regions EA11, EA21, EA33, and EA42 included in a single pixel P emits light The area may have an area in which the light leakage prevention layer is not provided. In addition, at least one of the first to fourth light-emitting areas EA11, EA21, EA33, and EA42 may have an area where no micro lens is provided.

For example, each of the first light-emitting area EA11 and the second light-emitting area EA21 includes a light leakage prevention layer, and neither the third light-emitting area EA33 and the fourth light-emitting area EA42 include a light leakage prevention layer. In addition, each of the first light emitting area EA11 and the second light emitting area EA21 includes a micro lens, while the third light emitting area EA33 and the fourth light emitting area EA42 do not include a micro lens. In other words, the light-emitting area including the area where the light leakage prevention layer is not provided may not include the microlens.

The organic light emitting display device according to the third exemplary embodiment of the present invention is not limited thereto, and a light emitting region having a light leakage prevention layer may not include microlenses.

Specifically, each of the first light-emitting area EA11 and the second light-emitting area EA21 includes a first light leakage prevention layer 110 and a second light leakage prevention layer 111. In contrast, none of the third light emitting area EA33 and the fourth light emitting area EA42 includes a light leakage prevention 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 microlenses.

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, a first electrode 230, an organic light emitting layer 240, and a second electrode 250 are also formed flat.

Here, neither the light leakage prevention layer nor the micro lens is provided in the fourth light emitting area EA42. Since the micro lens is not provided in the fourth sub-pixel SP4 that is most susceptible to light leakage, the leakage light component generated by the sub-pixels that generate light of different colors can be prevented from being caused by the micro lens provided in the fourth sub-pixel SP4. Extraction, so the leakage light component is not visually felt.

As described above, no micro lens is provided in the fourth sub-pixel SP4 to prevent light leakage, so that the structure of the light leakage prevention layer can be omitted from the fourth sub-pixel SP4.

Although FIGS. 6 and 7 show a structure in which neither the light leakage prevention layer nor the microlens is provided in the third light-emitting area EA33, the organic light-emitting display device according to the third exemplary embodiment of the present invention is not limited thereto. . On the contrary, not only are the microlenses and the light leakage prevention layer not provided in the fourth sub-pixel SP4, but they may not be provided in one of the first to third sub-pixels SP1, SP2, and SP3.

Therefore, it can be prevented that the light that would otherwise cause light leakage is not only extracted in the fourth sub-pixel, but also in other sub-pixels that are susceptible to light leakage.

Hereinafter, an organic light emitting display device according to the fourth exemplary embodiment of the present invention will be described with reference to FIGS. 8 and 9. 8 is a plan view showing an organic light-emitting display device according to a fourth exemplary embodiment of the present invention, and FIG. 9 is an organic light-emitting display device according to a fourth exemplary embodiment of the present invention taken along line GH in FIG. 8 Cutaway view.

Unless otherwise specified, the organic light emitting display device according to the fourth exemplary embodiment of the present invention may include the same components as the foregoing embodiment. The description of some components will be omitted because they are the same as the components of the foregoing embodiment. In addition, in the following, the same reference numerals or signs will be used to denote the same or similar components.

Referring to FIGS. 8 and 9, the organic light emitting display device according to the fourth exemplary embodiment of the present invention has at least two light emitting regions of a plurality of light emitting regions EA12, EA21, EA33, and EA42 included in a single pixel P Micro lens. The organic light emitting display device according to the fourth exemplary embodiment of the present invention is different from the organic light emitting display device according to the third exemplary embodiment of the present invention in that the shape of the microlens provided in at least one light emitting region is different from the shape of the microlens provided in the The shapes of the microlenses on the remaining light-emitting areas are 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. The microlenses are provided in at least two light emitting areas of the first to fourth light emitting areas EA12, EA21, EA33, and EA42. Among the at least two light-emitting regions, the shape of the microlens provided in one light-emitting region may be different from the shape of the microlens provided on the remaining light-emitting regions. In addition, a light leakage prevention layer and microlenses may be provided in at least one light emitting area.

For example, the second micro lens is provided in the first light emitting area EA12, the first micro lens is provided in the second light emitting area EA21, and no micro lens is provided 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 second microlenses per unit area of the first light-emitting area EA12 is greater than the number of first microlenses per unit area of the second light-emitting area EA21.

As described above, compared to the number of microlenses provided in the second light-emitting area EA21, a greater number of microlenses are provided in the first light-emitting area EA12 where the electroluminescent device with lower efficiency is provided, thereby increasing the number of microlenses. The frequency at which light generated by the electroluminescent device EL (330, 340, and 350) reaches the microlens. Therefore, the light emitting efficiency of the first light emitting area EA12 can be improved, thereby reducing power consumption.

Hereinafter, an organic light emitting display device according to the fifth exemplary embodiment of the present invention will be described with reference to FIGS. 10 and 11. 10 is a plan view showing an organic light emitting display device according to a fifth exemplary embodiment of the present invention, and FIG. 11 is an organic light emitting display device according to the fifth exemplary embodiment of the present invention taken along line IJ in FIG. 10 Cutaway view.

Unless otherwise specified, the organic light emitting display device according to the fourth exemplary embodiment of the present invention may include the same components as the foregoing embodiment. The description of some components will be omitted because they are the same as the components of the foregoing embodiment. In addition, in the following, the same reference numerals or signs will be used to denote the same or similar components.

10 and FIG. 11, in the organic light emitting display device according to the fifth exemplary embodiment of the present invention, at least three of the plurality of light emitting regions EA12, EA21, EA34, and EA42 included in a single pixel P The covering layer 420 in each light-emitting area has microlenses.

The shape of the microlens provided in at least one light emitting area may be different from the shape of the microlens provided on the remaining light emitting area. In some embodiments of the present invention, the shape of the microlens provided in at least one light-emitting area may be the same as the shape of the microlens provided on one light-emitting area of the remaining light-emitting areas.

In 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 on the remaining light-emitting areas.

For example, the microlens is provided in the first light-emitting area EA12, the second light-emitting area EA21, and the third light-emitting area EA34, and no micro lens is provided in the fourth light-emitting area EA42.

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

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

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

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

That is, the organic light emitting display device according to the fifth exemplary embodiment of the present invention has different microlens shapes according to the efficiency of the electroluminescent device disposed in the light emitting area, and thus the light emitting efficiency can be improved according to the light emitting area.

Although in the structures shown in FIGS. 10 and 11, 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 are described as having different diameters, However, the present invention is not limited to this, and may have at least one of the diameter, depth, FWHM, gap between adjacent recesses, slope, and aspect ratio of the first to third recesses is different from the corresponding one of the other recesses Any setting.

Hereinafter, an organic light emitting display device according to a sixth exemplary embodiment of the present invention will be described with reference to FIGS. 12 and 13. 12 is a plan view showing an organic light emitting display device according to a sixth exemplary embodiment of the present invention, and FIG. 13 is an organic light emitting display according to the sixth exemplary embodiment of the present invention taken along the line KL in FIG. 12 Sectional view of the device.

Unless otherwise specified, the organic light emitting display device according to the sixth exemplary embodiment of the present invention may include the same components as the foregoing embodiment. The description of some components will be omitted because they are the same as the components of the foregoing embodiment. In addition, in the following, the same reference numerals or signs will be used to denote the same or similar components.

12 and FIG. 13, in the organic light-emitting display device according to the sixth exemplary embodiment of the present invention, a single pixel P includes a plurality of light-emitting areas EA11, EA22, EA31, and EA41, wherein the micro lens is arranged in the first One, the third, and the fourth light-emitting areas EA11, EA31, and EA41, and no micro lens is arranged in the second light-emitting area EA22.

The first light leakage prevention layer 110, the second light leakage prevention layer 111, the third light leakage prevention layer 112, and the fourth light leakage prevention layer 113 are provided on a portion of the substrate 100 corresponding to the light emitting regions EA11, EA22, EA31, and EA41 on.

When the electroluminescent device EL (530, 540, 550) for generating green light is provided in the second light emitting area EA22, a plurality of microlenses are provided in the light emitting area EA11, the third light emitting area EA31, and the fourth light emitting area In EA41, the luminous efficiency is lower than that of the second light-emitting area EA22. This can improve the luminous efficiency.

Hereinafter, an organic light emitting display device according to a seventh exemplary embodiment of the present invention will be described with reference to FIGS. 14 and 15. 14 is a plan view showing an organic light emitting display device according to a seventh exemplary embodiment of the present invention, and FIG. 15 is an organic light emitting display device according to a seventh exemplary embodiment of the present invention taken along line MN in FIG. 14 Cutaway view.

Unless otherwise specified, the organic light emitting display device according to the seventh exemplary embodiment of the present invention may include the same components as the foregoing embodiments. The description of some components will be omitted because they are the same as the components of the foregoing embodiment. In addition, in the following, the same reference numerals or signs will be used to denote the same or similar components.

Referring to FIG. 14, the organic light emitting display device according to the seventh exemplary embodiment of the present invention has a plurality of first to fourth light emitting regions EA11, EA21, EA31, and EA43 included in a single pixel P. Micro lens. In addition, in a sub-pixel included in a single pixel P, a light leakage prevention layer may be disposed under a cover layer 320 having micro lenses.

In a single pixel P, a light leakage prevention layer provided in at least one sub-pixel may be formed of a different material from the light leakage prevention layer provided in other sub-pixels. Therefore, the reflectance of a specific sub-pixel can be reduced, and light leakage can be reduced.

This configuration will be described with reference to FIG. 15. Referring to FIG. 15, in the organic light emitting display device according to the seventh exemplary embodiment of the present invention, the fourth light leakage prevention layer 210 provided in at least one of the plurality of sub-pixels of a single pixel may be formed by A light reflecting material is formed. In addition, the first to third light leakage prevention layers 110, 111, and 112 provided in the other sub-pixels among the plurality of sub-pixels of a single pixel allow red, green, and blue light to pass through, respectively.

Specifically, an insulating layer 200 is disposed on the substrate 100 of the organic light emitting display device. The first to fourth light leakage prevention layers 110, 111, 112, and 210 are provided on the 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 on. The first to third light leakage prevention layers 110, 111, and 112 provided in the first to third sub-pixels SP1, SP2, and SP3 allow red, green, and blue light to pass through, respectively. In addition, the fourth light leakage prevention layer 210 provided in the fourth sub-pixel SP4 can reflect light.

The fourth light leakage prevention layer 210 provided in the fourth sub-pixel SP4 may include two or more layers. In particular, the fourth light leakage prevention layer 210 provided in the fourth sub-pixel SP4 includes a first metal layer 211 provided on the insulating layer 200 and a second metal layer 212 provided on the first metal layer 211 . Here, the insulating layer 200 may be an inorganic insulating layer formed of a material selected from silicon nitride (SiNx) and silicon oxide (SiO2), but is not limited thereto.

Since the fourth light leakage prevention layer 210 having two or more metal layers as described above is provided in the fourth sub-pixel SP4, light leakage caused by sub-pixels other than the fourth sub-pixel SP4 The components can be redirected from the first metal layer 211 or the second metal layer 212 toward the substrate 100 to reach a polarizer (not shown) disposed under the substrate 100.

The light leakage component reflected from the first metal layer 211 or the second metal layer 212 is redirected so that its path is different from the optical axis of the polarizer (not shown), thereby being captured in the display device without being extracted from the substrate 100 Out. That is, the light leakage component redirected by the first metal layer 211 or the second metal layer 212 is captured in the display device, so that the viewer cannot visually feel the light leakage component.

In other words, when the fourth light leakage prevention layer 210 is not provided in the fourth sub-pixel SP4, the light leakage component generated by the remaining sub-pixels may be between the substrate 100 and the polarizer (not shown) The boundary of is reoriented to reach the micro lens of the fourth sub-pixel SP4. The light that has reached the microlens can be extracted from the substrate 100 through the microlens, thereby causing light leakage. That is, the microlens can convert the optical axis of the light reaching the microlens to be coaxial with the optical axis of the polarizer (not shown), so that the light can be extracted from the substrate 100 to be visually perceived by the viewer.

In addition, when the external light 850 enters the fourth sub-pixel SP4 from the outside of the substrate 100, the external light 850 may be reflected from the first metal layer 211 or the second metal layer 212 to be redirected toward the substrate 100. Since the optical axis of the external light 850 changes while the external light 850 is reflected from the first metal layer 211 or the second metal layer 212, the external light 850 cannot pass through the polarizer provided on the bottom surface of the substrate 100 (not shown) . Since the external light 850 cannot leave 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 dielectric constant or a negative dielectric constant. The absolute value of the dielectric constant of the first metal layer 211 may be greater than the absolute value of the dielectric constant of the insulating layer 200.

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

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

When light reaches the boundary between the insulating layer and the metal layer with a high dielectric coefficient, the incident light can be absorbed by the metal layer, or most of the incident light can be lost due to a non-emissive plasma mode, thereby reducing the transmittance . According to the non-emissive plasmonic mode, light loss is caused by electron oscillation on the surface of a metal layer used as a reflector, interference of wavelengths of light generated by an organic electroluminescence device, and absorption by the metal layer. That is, when the insulating layer and the metal layer functioning as a reflector are placed in contact with each other, light loss occurs at the boundary between the insulating layer and the metal layer, thereby reducing transmittance.

On the contrary, the first metal layer 211 having a negative dielectric constant is provided in the fourth sub-pixel SP4 between the insulating layer 200 and the second metal layer 212, and the absolute value of the dielectric constant of the first metal layer 211 is greater than that of the insulating layer. The absolute value of the dielectric constant of the layer 200. Therefore, this configuration can reduce the amount of light loss, thereby increasing the transmittance of the fourth sub-pixel SP4. Therefore, the light generated by the electroluminescent device EL can be extracted from the substrate 100 outside through the fourth light leakage prevention 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 magnetic permeability. Since the dielectric coefficient 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.

A material with a negative refractive index allows light to pass through without reflecting or absorbing incident light. In addition, the first metal layer 211 and the second metal layer 212 may be configured to be significantly thinner. 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 nanometer (nm) to 30 nanometers (nm). Since the first metal layer 211 and the second metal layer 212 are formed thinner, the transmittance of the fourth light leakage prevention 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 of the fourth light leakage prevention layer 210, a part of the light is reflected from the second metal layer 212, and the rest of the light passes through the second metal layer 212 Reach the first metal layer 211. As described above, the first metal layer 211 does not reflect or absorb light, so that light can be extracted 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 and second metal layers 211 and 212 provided on the insulating layer 200, the light leakage component and reflectivity can be reduced, and the light generated by the electroluminescent device EL The transmittance can be improved.

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

Hereinafter, an insulating layer and a fourth light leakage prevention layer provided in the fourth sub-pixel according to an alternative embodiment of the present invention will be described with reference to FIG. 16. FIG. 16 shows the configuration of the insulating layer and the fourth light leakage prevention layer provided in the fourth sub-pixel according to this alternative embodiment of the present invention.

Referring to FIG. 16, in the display device according to this alternative embodiment of the present invention, an insulating layer 300 is disposed on the portion of the substrate 100 corresponding to the first to third sub-pixels SP1, SP2, and SP3, and The first to third light leakage prevention layers 110, 111, and 112 are provided on the insulating layer 300.

The cover layer 420 with microlenses is provided on the first to third light leakage prevention layers 110, 111, and 112 provided in the first to third sub-pixels SP1, SP2, and SP3. An electroluminescent device EL having 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 prevention 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 formed integrally with the part of the insulating layer 300 provided in the first to third sub-pixels SP1, SP2, and SP3 is provided on the fourth metal layer 312. That is, the insulating layer 300 to be provided in the fourth sub-pixel SP4 can be formed using the process of forming the insulating layer 300 in the first to third sub-pixels SP1, SP2, and SP3 without any additional deal with.

A cover layer 420 with microlenses is provided on the insulating layer 300 of the fourth sub-pixel SP4, and the electroluminescent device EL having a first electrode 430, an organic light-emitting layer 440, and a second electrode 450 is provided to cover On layer 420. The shapes of the first electrode 430, the organic light emitting layer 440, and the second electrode 450 disposed in the first to fourth sub-pixels SP1 to SP4 can be determined according to the shape of the microlens disposed on the cover layer 420.

The third metal layer 311 and the fourth metal layer 312 provided in the fourth sub-pixel SP4 may be composed of one layer or multiple layers, respectively. The third metal layer 311 may be formed of a metal. For example, the third metal layer 311 may be formed of at least one selected from silver (Ag), aluminum (Al), and gold (Au).

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

In addition, the third metal layer 311 and the fourth metal layer 312 may be configured to be significantly thinner. 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 nanometer (nm) to 30 nanometers (nm). Since the third metal layer 311 and the fourth metal layer 312 are formed to be thinner, the transmittance of the fourth light leakage prevention layer 310 can be improved.

As described above, in the fourth sub-pixel 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 therefore reduce the light leakage component and reflectance, 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 prevention layer provided in at least one sub-pixel includes two or more layers formed of metal, which has an absolute value of negative permittivity greater than A metal layer of the absolute value of the dielectric constant of the insulating layer is arranged between the insulating layer and another metal layer having a higher reflectivity level.

In the following, the reflectance reduction effect of the organic light-emitting display devices of these examples of the present invention is compared with the reflectance reduction effect of the organic light-emitting display device of the comparative example. FIG. 17 is a graph showing the reflectance reduction effect of the organic light emitting display devices of these examples and comparative examples of the present invention.

Referring to FIG. 17, we will compare each organic light emitting display device (comparative example) in which only a metal layer with a high reflectance level is used as a light leakage prevention layer with the light leakage prevention layer in each including the first stacked on each other. The metal layer and the second metal layer. The first metal layer has a negative dielectric coefficient, and its absolute value is greater than that of an insulating layer in contact with the light leakage prevention layer, and the second metal layer has a higher Horizontal reflectivity (these examples of the invention).

In FIG. 17, the x-axis represents the incident angle of external light to an organic light-emitting display device, and the y-axis represents the reflectance of the organic light-emitting display device. A metal layer with a higher level of reflectivity is formed of silver (Ag) and has a negative dielectric coefficient, the absolute value of which is greater than that of an insulating layer in contact with the light leakage prevention layer. It is formed by calcium (Ca).

In an organic light emitting display device with microlenses, when external light is incident at a large angle (for example, an angle of 40° or more), the external light is scattered by the microlens to make the viewer visually perceive it. Therefore, as in the above-mentioned embodiment of the present invention, it is necessary to change the optical axis of external light by using a light leakage prevention layer or the like to prevent external light incident on the organic light emitting display device from leaving the display device.

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

On the contrary, it should be understood that these examples of the present invention respectively include organic light emitting display devices in which calcium (Ca) and silver (Ag) are laminated with a light leakage prevention layer in a thickness of 5 (nm) to 10 nanometers (nm), About 50% to about 80% of external light incident at a large angle is reflected. This means that the ratio of the difference between the optical axis of the external light incident on the display device and the optical axis of the polarizer is about 50% to about 80%.

As described above, it should be understood that each light leakage prevention layer of the organic light emitting display devices of these examples of the present invention reflects a larger amount of external light than each light leakage prevention layer of the organic light emitting display device of the comparative example. That is, the increase in the amount of external light reflected from the light leakage prevention layer provided in each of the organic light-emitting display devices of these examples of the present invention makes the optical axis of the external light different from the optical axis of the polarizer, thereby reducing The amount of light leaving the display device. Therefore, the reflectivity of external light can be reduced.

According to the present invention as described above, the organic light-emitting display device includes a light leakage prevention layer disposed in an area corresponding to the light-emitting area in at least one of the plurality of sub-pixels to prevent or reduce different sub-pixels Or light leakage between different pixels, while preventing the reduction of light extraction efficiency generated by organic electroluminescence (EL) devices.

In addition, in the organic light emitting display device according to the present invention, each of the plurality of pixels includes a plurality of sub-pixels, wherein the sub-pixels include different microlenses or at least one of the sub-pixels There is no microlens, so the light extraction efficiency can be adjusted according to the sub-pixels, and light leakage can be prevented.

The features, structures, and effects described in the present invention are included in at least one embodiment of the present invention, but are not necessarily limited to a specific embodiment. A person skilled in the art can apply the features, structures, and effects shown in a specific 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 in the scope of the present invention.

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

100‧‧‧Substrate 110‧‧‧First light leakage prevention layer 111‧‧‧Second light leakage prevention layer 112‧‧‧The third light leakage prevention layer 113‧‧‧The fourth light leakage prevention layer 120‧‧‧cover Layer 130‧‧‧First electrode 140‧‧‧Organic light-emitting layer 150‧‧‧Second electrode 160‧‧‧Bank pattern 200‧‧‧Insulation layer 201‧‧‧First recess 202‧‧‧First connection 210 ‧‧‧Fourth light leakage prevention layer 211‧‧‧First metal layer 212‧‧‧Second metal layer 220‧‧‧Cover layer 230‧‧‧First electrode 240‧‧‧Organic light emitting layer 250‧‧‧第Second electrode 300‧‧‧Insulation layer 301‧‧‧Second concave portion 302‧‧‧Second connection portion 310‧‧‧Fourth light leakage prevention layer 311‧‧‧Third metal layer 312‧‧‧Fourth metal layer 320 ‧‧‧Cover layer 330‧‧‧Electroluminescence device EL340‧‧‧Electroluminescence device EL350‧‧‧Electroluminescence device EL401‧‧‧Third recess 420‧‧‧Cover layer 430‧‧‧First electrode 440 ‧‧‧Organic light emitting layer 450‧‧‧Second electrode 530‧‧‧Electroluminescence device EL540‧‧‧Electroluminescence device EL550‧‧‧Electroluminescence device EL800‧‧‧Light 850‧‧‧External light 1000‧ ‧‧Display device 1100‧‧‧Display panel 1200‧‧‧First driving circuit 1300‧‧‧Second driving circuit 1400‧‧‧Data line EL‧‧‧Electroluminescence device EA11‧‧‧First light-emitting area EA12‧ ‧‧First luminous area EA21‧‧‧Second luminous area EA22‧‧‧Second luminous area EA31‧‧‧Third luminous area EA32‧‧‧Third luminous area EA33‧‧‧Third luminous area EA34‧‧‧ The third light-emitting area EA41‧‧‧the fourth light-emitting area EA42‧‧‧the fourth light-emitting area EA43‧‧‧the fourth light-emitting area SP1‧‧‧the first sub-pixel SP2‧‧‧the second sub-pixel SP3‧‧‧ The third sub-pixel SP4‧‧‧The fourth sub-pixel D1‧‧‧The diameter of the first recess 201 D2‧‧‧The diameter of the second recess 301 D3‧‧‧The diameter of the third recess 401 VL1…VLm‧‧‧ First line HL1…HLn‧‧‧Second line AB‧‧‧Line CD‧‧‧Line EF‧‧‧Line GH‧‧‧Line IJ‧‧‧Line KL‧‧‧Line MN‧‧‧Line P‧‧ ‧Pixel

Fig. 1 is a block diagram schematically showing a display device according to an exemplary embodiment of the present invention; Fig. 2 is a plan view showing an organic light emitting display device according to a first exemplary embodiment of the present invention; Fig. 2 is a cross-sectional view of the organic light emitting display device according to the first exemplary embodiment of the present invention taken along the line AB; Fig. 4 is a plan view showing the organic light emitting display device according to the second exemplary embodiment of the present invention; Is a cross-sectional view of the organic light-emitting display device according to the second exemplary embodiment of the present invention taken along the line CD in FIG. 4; FIG. 6 is a plan view showing the organic light-emitting display device according to the third exemplary embodiment of the present invention; 7 is a cross-sectional view of the organic light emitting display device according to the third exemplary embodiment of the present invention taken along line EF in FIG. 6; FIG. 8 is a plan view showing the organic light emitting display device according to the fourth exemplary embodiment of the present invention 9 is a cross-sectional view of the organic light-emitting display device according to the fourth exemplary embodiment of the present invention taken along the line GH in FIG. 8; FIG. 10 is a cross-sectional view of the organic light-emitting display device according to the fifth exemplary embodiment of the present invention 11 is a cross-sectional view of the organic light emitting display device according to the fifth exemplary embodiment of the present invention taken along the line IJ in FIG. 10; FIG. 12 is a diagram showing the organic light emitting according to the sixth exemplary embodiment of the present invention A plan view of the display device; FIG. 13 is a cross-sectional view of the organic light emitting display device according to the sixth exemplary embodiment of the present invention taken along the line KL in FIG. 12; FIG. 14 is a sectional view of the organic light emitting display device according to the seventh exemplary embodiment of the present invention A plan view of an organic light-emitting display device; FIG. 15 is a cross-sectional view of an organic light-emitting display device according to a seventh exemplary embodiment of the present invention taken along line MN in FIG. 14; FIG. 16 shows an alternative embodiment of the present invention The structure of the insulating layer and the fourth light leakage prevention layer provided in the fourth sub-pixel; and FIG. 17 is a graph showing the reflectance reduction effect of the organic light emitting display devices of these examples and comparative examples of the present invention.

100‧‧‧Substrate

110‧‧‧First light leakage prevention layer

111‧‧‧Second light leakage prevention layer

112‧‧‧The third light leakage prevention layer

113‧‧‧The fourth light leakage prevention layer

120‧‧‧Cover

130‧‧‧First electrode

140‧‧‧Organic light-emitting layer

150‧‧‧Second electrode

160‧‧‧Dike pattern

201‧‧‧First recess

202‧‧‧First connection part

800‧‧‧Light

EL‧‧‧Electroluminescence device

EA11‧‧‧First light-emitting area

EA21‧‧‧Second luminous area

EA31‧‧‧The third light-emitting area

EA41‧‧‧The fourth light-emitting area

SP1‧‧‧First sub-pixel

SP2‧‧‧Second sub-pixel

SP3‧‧‧The third sub-pixel

SP4‧‧‧Fourth sub-pixel

Line A-B‧‧‧

Claims (20)

An organic light-emitting display device, comprising: a substrate; a pixel arranged on the substrate and including a plurality of sub-pixels; a cover layer arranged on the substrate, and the cover layer includes a plurality of microlenses; The electroluminescence device is arranged on the covering layer; a bank pattern is arranged on the covering layer and used to define a light-emitting area of one of the sub-pixels; a plurality of filter layers are respectively arranged in each of the sub-pixels; And wherein, a part of the sub-pixels in the sub-pixels include the microlenses and the filter layer, and the remaining sub-pixels in the sub-pixels only include the filter layer. The organic light emitting display device according to claim 1, wherein each of the filter layers allows light of different colors to pass. The organic light emitting display device according to claim 2, wherein the microlenses in the part of the sub-pixels have different shapes. The organic light emitting display device according to claim 2, wherein the number of microlenses per unit area in the part of the sub-pixels is different. The organic light emitting display device according to claim 2, wherein the pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the part of the sub-pixels in the sub-pixels includes the red Sub-pixel and the green sub-pixel, and the remaining sub-pixels in the sub-pixels include the blue sub-pixel. The organic light emitting display device according to claim 5, wherein the pixel further includes a white sub-pixel, and wherein the white sub-pixel includes the microlenses. The organic light emitting display device according to claim 6, wherein the white sub-pixel further includes the filter layer. The organic light emitting display device according to claim 7, wherein the filter layer located in the white sub-pixel is compared with the filter located in the red sub-pixel, the green sub-pixel, and the blue sub-pixel The layer is thinner. An organic light emitting display device, comprising: a substrate; a pixel arranged on the substrate, and the pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel; a plurality of filter layers are respectively arranged In each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel; a cover layer is disposed on the filter layers, and the cover layer includes a plurality of microlenses An organic electroluminescence device is disposed on the cover layer; and a bank pattern is disposed on the cover layer, and the bank pattern is used to define the red sub-pixel, the green sub-pixel and the blue sub-pixel A light-emitting area of a pixel, wherein each of the red sub-pixel and the green sub-pixel includes: the microlenses located between the organic electroluminescence device and the substrate; and the microlenses and the The filter layers between the substrates, The blue sub-pixel includes the filter layer between the organic electroluminescence device and the substrate, and the number of microlenses per unit area in the red sub-pixel is different from that of the green sub-pixel The number of microlenses per unit area in the element. The organic light emitting display device according to claim 9, wherein the filter layers located in the red sub-pixel, the green sub-pixel and the blue sub-pixel allow light of different colors to pass. The organic light-emitting display device according to claim 9, wherein the blue sub-pixel only includes the filter layer between the organic electroluminescence device and the substrate. The organic light emitting display device according to claim 9, wherein the pixel further includes a white sub-pixel, and wherein the white sub-pixel includes the microlenses located between the organic electroluminescence device and the substrate. The organic light emitting display device according to claim 12, wherein the white sub-pixel includes the filter layer. The organic light emitting display device according to claim 13, wherein the filter layer located in the white sub-pixel is compared with the filter located in the red sub-pixel, the green sub-pixel, and the blue sub-pixel The layer is thinner. An organic light emitting display device, comprising: a substrate; a pixel arranged on the substrate, and the pixel includes: a first group of sub-pixels having a part of the sub-pixels, and A second set of sub-pixels, which have the remaining sub-pixels among the sub-pixels; A filter layer is arranged in at least one of the sub-pixels; a covering layer is arranged on the substrate; an organic electroluminescence device is arranged on the covering layer; and a bank pattern is arranged On the cover layer, and the bank pattern is used to define a light-emitting area of the sub-pixels, wherein the cover layer includes: a plurality of microlenses in each sub-pixel in the first group of sub-pixels; And a plane located in the second set of sub-pixels. The organic light emitting display device according to claim 15, wherein the pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the first group of sub-pixels includes the red sub-pixel and the green sub-pixel Pixel, the second group of sub-pixels includes the blue sub-pixel, wherein each of the red sub-pixel and the green sub-pixel includes: between the organic electroluminescence device and the substrate The microlenses; and the filter layer located between the ones and the substrate, and wherein the blue sub-pixel includes the filter layer located between the plane of the cover layer and the substrate. The organic light emitting display device according to claim 16, wherein the filter layers located in the red sub-pixel, the green sub-pixel, and the blue sub-pixel allow light of different colors to pass. The organic light emitting display device according to claim 16, wherein the number of microlenses per unit area in the red sub-pixel is different from the number of microlenses per unit area in the green sub-pixel. The organic light emitting display device according to claim 16, wherein the first group of sub-pixels further includes: a white sub-pixel, and the white sub-pixel includes the microlenses and the filter layer. The organic light emitting display device according to claim 19, wherein the filter layer located in the white sub-pixel is compared with the filter layer located in the red sub-pixel, the green sub-pixel, and the blue sub-pixel Thinner.

Images