TW201813152A - 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.

Organic light emitting display devices can be made relatively light and thin because organic light emitting (EL) devices or organic light emitting diodes (OLEDs) capable of emitting light are used therein, and a separate light source is not required. 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 rates, and wide viewing angles. And high contrast. Therefore, organic light emitting display devices for next-generation displays have been actively studied.

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 parts 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 captured in the organic light emitting display device, thereby causing 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 having 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 the organic light emitting display device, a method of attaching a micro lens array (MLA) to a cover layer of an organic light emitting display device or a method of forming micro lenses on the cover layer of an organic light emitting display device has been proposed.

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

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; and a light leakage prevention layer disposed on the substrate and at least one of the sub-pixels On a portion corresponding to a light-emitting region of the sub-pixel; a cover layer disposed on a portion of the substrate corresponding to at least one of the sub-pixels, and including a plurality of concave portions or a plurality of convex portions Microlenses; and an organic electroluminescence device disposed on the cover layer.

In at least some embodiments of the present invention, these sub-pixels may 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 a 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 through. .

These microlenses may include a plurality of first microlenses and a plurality of second microlenses, wherein the second microlenses are disposed in at least one of the subpixels of the subpixels where the first microlens is not provided, and the second microlenses Same or different from the first microlens. These microlenses may further include a plurality of third microlenses. The third microlenses are the same as the first microlenses or the second microlenses or 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 preventing layer may not be disposed in at least one of the sub pixels. The first micro lens may not be disposed in at least one of the sub pixels.

According to the present invention as described above, the organic light-emitting display device includes a region corresponding to a light-emitting region in at least one of the plurality of sub-pixels to prevent or reduce different sub-pixels or different Leakage of light between pixels while preventing a reduction in 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 No micro-lens is provided, whereby 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 embodiments of the present invention, some examples of which are illustrated in the accompanying drawings. The embodiments set forth herein are for the purpose of illustration to fully convey the concepts of the invention to those skilled in the art. The invention should not be construed as being limited to these embodiments, and may be implemented in many different forms. In the drawings, the size and thickness of the device may be enlarged for clarity. Herein, the same reference numerals and signs will be used to represent the same or similar parts.

The advantages and features of the present invention and its implementation method will be apparent with reference to the drawings and detailed description of the embodiments. The invention should not be construed as limited to the embodiments set forth herein, and may be implemented in many different forms. Rather, these embodiments are provided so that this invention will be thorough and complete, and will better convey the scope of the invention to those skilled in the art. The scope of the invention will be defined by the scope of the attached patent application. Herein, the same reference numerals and signs will be used to represent the same or similar parts. 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 be “directly on” the other element or layer, and also “indirectly” by “intermediate” elements or layers. On another component or layer. In contrast, when an element or layer is referred to as being “directly on” another element or layer, it should be understood that no intervening element or layer is interposed.

Spatial relative terms such as "below", "below", "below", "bottom", "above", and "top" may be used herein to facilitate the description of elements or components shown in the drawings Relationship to another element or other component. Spatial relative terms should be construed as terms that include different orientations of elements in use or operation in addition to the orientation depicted in the drawings. For example, when an element shown in the figure is turned over, an element described as "below", "beneath", or "below" another element would be oriented "above" the other element. Thus, 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)" may be used herein to describe components. It should be understood, however, that these terms are only used to distinguish one component from another and the substance, sequence, sequence, or number of components is 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. Referring to FIG. 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 a plurality of second lines HL1 to HLn are provided along a second direction, that is, a horizontal direction in the drawing; 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 certain time controller 1400 is used to control the first driving circuit 1200 and the second driving circuit 1300.

A plurality of pixels P are defined on the display panel 1100 by the intersection of the first lines VL1 to VLm provided in the first direction and the second lines HL1 to HLn provided 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 an image display signal.

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

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

The display panel 1100 has pads disposed thereon, which 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 a first signal to the first lines VL1 to VLm, the pad transmits the first signal to the display panel 1100. In the same manner, 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 selective white (W), but the present invention is not limited thereto.

In a 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 disposed 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 electroluminescent device, the organic light emitting display device can be classified into a top emission type or a bottom emission type. Although the embodiments of the present invention are described below as a bottom emission type organic light emitting display device, the present invention is not limited thereto.

Each sub-pixel may be a substrate with or without a color filter having a single color. The color filter converts a 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 may be referred to as a micro lens array, a nano pattern, a diffusion pattern, silicon dioxide beads, and the like.

Hereinafter, embodiments of the scattering layer will be described with respect to the microlens array. However, exemplary embodiments of the present invention 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 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 a first exemplary embodiment of the present invention.

Referring 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 include four (4) sub-pixels. In the following exemplary embodiment 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 thereto, 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) include light-emitting regions EA11, EA21, EA31, and EA41, respectively. For example, the first sub-pixel includes a first light-emitting area EA11, the second sub-pixel includes a second light-emitting area EA21, the third sub-pixel includes a third light-emitting area EA31, and the fourth sub-pixel includes a 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 Exemplary embodiments of the invention are not limited thereto. In contrast, it can be realized that at least two of the four light-emitting regions EA11, EA21, EA31, and EA41 emit colors different from the above-mentioned red (R), green (G), blue (B), and white (W). The structure 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 provided 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 line, a curve, or a parabola, for example. 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 cover layer 120, and each of the first connecting portions 202 connects adjacent first concave portions 201.

Microlenses having the same shape are provided in the first to fourth light emitting regions 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 a 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 microlenses of adjacent sub-pixels or the microlenses of another adjacent pixel that generate light of different colors, resulting in light leakage. In particular, when a display device is provided with a sub-pixel without a color filter, a significant amount of leaked light components generated by other sub-pixels can reach the microlenses of the sub-pixel without a color filter to be visually recognized . In particular, when a color filter is not set in a white (W) sub-pixel, the leaked light component generated by another sub-pixel may reach the microlenses of the white sub-pixel to be visually perceived by the viewer, This is problematic.

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 provided on the substrate 100 divided into the first to fourth sub-pixels SP1 to SP4. More generally, the light leakage preventing layer is, for example, preventing or substantially reducing at least a portion of the light generated in the sub-pixels from reaching different sub-pixels of adjacent sub-pixels, preventing or substantially reducing the number of different sub-pixels. Light leaks between layers. 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: a type I light leakage prevention layer configured to allow light of a specific wavelength to pass while absorbing light of the remaining wavelength; Type II light leakage prevention layer is configured to allow a specific wavelength of light to pass through while absorbing a portion of visible light to allow the remaining visible light to pass through; type III light leakage prevention layer is configured to allow light to pass or reflect while changing the optical axis of the light The light having a changed optical axis is then absorbed by a polarizer. In one embodiment of the present invention, the type I light leakage prevention layer selectively allows light of a specific color to pass through while absorbing light of the remaining wavelengths, whereby a major portion (for example, at least 60%) of the specific color passes therethrough, And absorb a major part of the light of the remaining wavelength (for example at least 60%). In an embodiment of the present invention, a type III light leakage prevention layer allows light to pass or reflect, while changing the optical axis of the light by at least 50%. Specifically, the first light leakage prevention layer 110 is disposed on the first sub-pixel SP1, the second light leakage prevention layer 111 is disposed on the second sub-pixel SP2, and the third light leakage prevention layer 112 is disposed on the third sub-picture. The pixel SP3 and the fourth light leakage prevention layer 113 are disposed 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. An organic electroluminescent 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 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 regions 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, the first recesses 201 formed in the cover layer 120 give organic electroluminescence due to the characteristics of the pattern. The surface of the light emitting device EL has a concave curved portion.

The first to fourth light leakage prevention layers 110 to 113 are provided in areas corresponding to the light emitting areas 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 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 in order to increase the light transmittance to a light transmission ratio compared to other light leakage prevention layers. Higher luminosity.

The principle of preventing light leakage will be described in detail by using the first to fourth light leakage prevention layers 110 to 113 below. The refractive indexes of the first electrode 130 and the organic light emitting layer 140 of the organic electroluminescent device EL may be higher than those of the substrate 100 and the cover layer 120. For example, the refractive index of the substrate 100 and the cover layer 120 is about 1.5, and the refractive indexes of the first electrode 130 and the organic light emitting layer 140 of the organic electroluminescent device EL are in a 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. That is, 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 substantially 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 between the organic light emitting layer 140 and the first electrode 130. Due to the difference in refractive index between the first electrode 130 and the 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 may be between the first electrode 130 and the cover layer 120. Total reflection at the boundary between the two.

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 its refractive index and The substrate 100 having substantially the same refractive index as the cover layer 120 reaches a polarizer (not shown) disposed on the surface of the substrate 100 behind 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 in correspondence to the light emitting areas EA11, EA21 In the areas of EA31, EA31, and EA41, the microlenses used to prevent light from traveling to an adjacent sub-pixel or another pixel at an angle greater than the total reflection threshold angle.

Specifically, a part of the light 800 generated by the organic light emitting layer 140 is totally reflected at a 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 rays 800 traveling at an angle smaller than the total reflection threshold angle passes through the cover layer 120 and the substrate 100, and then re-reflects at the boundary between the substrate 100 and a polarizer (not shown) to Redirected to substrate 100.

Thereafter, a portion of the light rays 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 light generated by different sub-pixels or different pixels is absorbed by the light leakage prevention 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 this embodiment of the present invention are characterized by allowing light of a specific wavelength to pass through and absorb light of the remaining wavelengths, the first to fourth light leakage prevention layers 110 to 113 are Light of a specific wavelength in the leaked light component can be allowed to pass, while light of the remaining wavelength in the leaked light component can be absorbed. For example, when a fourth light leakage preventing layer 113 that allows blue (B) light to pass is provided in the fourth sub-pixel SP4, the fourth light leakage preventing layer 113 allows leakage light components having a blue wavelength range to pass through , While absorbing light with the rest of the 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 blue light rays are less efficient, this can thus compensate for the blue light rays.

Alternatively, at least two of the first to fourth light leakage prevention layers 110 to 113 may allow light of the same color to pass through. 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, and the fourth light leakage prevention layer 113 allows the first to third The light leakage prevention layers 110, 111, and 112 allow light having 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 The fourth light leakage prevention layer 113 allows one of red light, green light, and blue light to pass through. 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, In order to allow not only one or more of red, green, and blue light to pass, but also other visible light to pass. Here, for light in 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 is used for transmission of the visible light fourth light leakage prevention layer 113 The rate may 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 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 through, a leaked light component generated by the second sub-pixel SP2 or the third sub-pixel SP3 is directed toward the fourth sub-pixel. When SP4 is oriented, the leaked light component is absorbed by the fourth light leakage prevention layer 113. This prevents 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 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 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 at the same time can prevent light leakage .

In addition, when a green or blue leaked 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 green or blue light, thereby Prevents light leakage. The fourth light leakage prevention layer 113 selectively allows red light to pass through, so that it can absorb 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 green or blue leakage light components generated by the second sub-pixel SP2 or the third sub-pixel SP3, and the second light leakage prevention layer 111 may absorb the first sub-picture 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 configuration described above, the fourth light leakage prevention layer 113 is shown to allow light of the same color as the light allowed to pass through by the first light leakage prevention layer 110, the light emitting display device according to the first exemplary embodiment of the present invention is not limited to this. In contrast, the fourth light leakage prevention layer 113 may allow light having the same color as the light rays allowed to pass through the second or third light leakage prevention layer 111 or 112 to pass through.

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

In addition, the first to fourth light leakage prevention layers 110 to 113 are not limited to the above-mentioned 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 of the 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, and the fourth light leakage prevention layer 113 may allow the first to One of the third light leakage prevention layers 110, 111, and 112 allows light of one or more colors with complementary light colors to pass through.

In particular, the fourth light leakage prevention layer 113 may allow light in a wavelength range complementary to the 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 absorb 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 range of light wavelengths corresponding to the coordinates (0.35,0.1) to (0.55,3) in the 1931 CIE-xy color coordinate system to pass while absorbing light of other colors, thereby minimizing Light leakage.

Since 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, the fourth light leakage prevention layer 113 can prevent or The light loss generated 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 the 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 areas corresponding to the first to fourth sub-pixels SP1 to SP4 corresponding to the first to fourth light-emitting areas 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 coordinates (0.35, 0.1) to (0.55, 3) in the 1931 CIE-xy color coordinate system ) The light color (or wavelength range of light) passes through, so it can prevent or reduce light leakage between different sub-pixels or between different pixels, and at the same time prevent the light-emitting efficiency of the organic electroluminescent device from being deteriorated.

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. FIG. 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 embodiments. A description of some components will be omitted because they are the same as those of the foregoing embodiment. In addition, hereinafter, the same reference numerals or signs will be used to indicate the same or similar components.

Please refer to FIG. 4, in addition to the shape of a microlens provided in at least one light emitting area, an organic light emitting display device according to a second exemplary embodiment of the present invention and an 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 regions EA11, EA21, EA32, and EA41. The shape of the microlenses 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 microlenses 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 that 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 an adjacent first concave portion 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 an adjacent second concave portion 301.

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

Although in FIG. 4 and FIG. 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, the second exemplary according to the present invention The embodiment is not limited thereto. Any structure in which the shape of the first concave portion 201 is different from the shape of the second concave portion 301 may be adopted.

This configuration will now be described in detail with reference to FIG. 5. 5 is a cross-sectional view of an organic light emitting display device according to a second exemplary embodiment of the present invention, taken along a line C-D in FIG. 4. Referring to FIG. 5, 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 provided 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 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 microlens is a main factor to improve the light extraction efficiency. Therefore, the optical 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 provided in the third light emitting area EA32 is smaller than the first microlens provided in the first, second, and fourth light emitting areas EA11, EA21, and EA41. The diameter D1 of the first concave portion 201 can increase the frequency at which the light generated from the third light-emitting area EA32 of the organic electroluminescent device EL reaches the microlens structure. Therefore, the light extraction efficiency of the child 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 between different sub pixels or between different pixels. Light leaks.

Hereinafter, an organic light emitting display device according to a 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 a third exemplary embodiment of the present invention, and FIG. 7 is a view showing an organic light emitting display device according to the third exemplary embodiment of the present invention, taken along a 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. A description of some components will be omitted because they are the same as those of the foregoing embodiment. In addition, hereinafter, the same reference numerals or signs will be used to indicate the same or similar components.

Please refer to FIGS. 6 and 7. In an organic light emitting display device according to a third exemplary embodiment of the present invention, at least one of 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 a 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 in which a microlens is not 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 the third light-emitting area EA33 and the fourth light-emitting area EA42 do not 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 microlens, and neither of the third light-emitting area EA33 and the fourth light-emitting area EA42 includes a microlens. That is, the light emitting area including the area where the light leakage prevention layer is not provided may not include the micro lens.

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 a micro lens.

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 a microlens.

That is, in the third light emitting area EA33 and the fourth light emitting area EA42, the cover layer 220 may be formed 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 microlens is provided in the fourth light emitting area EA42. Since the microlenses are not set in the fourth sub-pixel SP4 that is most susceptible to light leakage, the leaked light component generated by the sub-pixels that generate light of different colors can prevent the microlenses set in the fourth sub-pixel SP4 The light component is extracted, so the light component is not visually felt.

As described above, the fourth sub-pixel SP4 is not provided with a microlens to prevent light leakage, so that the structure of the light leakage prevention layer can be omitted from the fourth sub-pixel SP4.

Although a structure in which neither the light leakage prevention layer nor the 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 of the present invention is not limited thereto . In contrast, not only the microlenses and the light leakage prevention layer are 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 is possible to prevent the light which would otherwise cause light leakage from being extracted outside through the microlens not only in the fourth sub-pixel, but also in other sub-pixels which are susceptible to light leakage.

Hereinafter, an organic light emitting display device according to a fourth exemplary embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG. 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 a view showing an organic light emitting display device according to the 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 embodiments. A description of some components will be omitted because they are the same as those of the foregoing embodiment. In addition, hereinafter, the same reference numerals or signs will be used to indicate the same or similar components.

8 and FIG. 9, an organic light emitting display device according to a fourth exemplary embodiment of the present invention has at least two light emitting areas in a plurality of light emitting areas EA12, EA21, EA33, and EA42 included in a single pixel P. Micro lenses. 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 microlenses provided in at least one light emitting area and 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. In at least two light emitting regions, the shape of the microlenses provided in one light emitting region may be different from the shape of the microlenses provided in the remaining light emitting regions. In addition, a light leakage prevention layer and a micro lens may be disposed in at least one light emitting area.

For example, the second microlens is provided in the first light emitting area EA12, the first microlens is provided in the second light emitting area EA21, and no microlens 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 that of the second microlens.

Specifically, the diameter D2 of the second concave portion 301 of the second microlens provided 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 per unit area of the first light emitting area EA12 is larger than the number of the first microlenses per unit area of the second light emitting area EA21.

As described above, compared with the number of microlenses provided in the second light emitting area EA21, a larger number of microlenses are provided in the first light emitting area EA12 in which an electroluminescent device having a lower efficiency is provided, thereby increasing Frequency at which light generated by the electroluminescent devices EL (330, 340, and 350) reaches the microlenses. Therefore, the light emission efficiency of the first light emitting region EA12 can be improved, thereby reducing power consumption.

Hereinafter, an organic light emitting display device according to a fifth exemplary embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG. 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 embodiments. A description of some components will be omitted because they are the same as those of the foregoing embodiment. In addition, hereinafter, the same reference numerals or signs will be used to indicate the same or similar components.

Please refer to FIG. 10 and FIG. 11. In an organic light emitting display device according to a fifth exemplary embodiment of the present invention, at least three of the plurality of light emitting areas EA12, EA21, EA34, and EA42 included in a single pixel P The cover layer 420 in each of the light emitting regions has a microlens thereon.

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

In the plurality of light-emitting regions EA12, EA21, EA34, and EA42 included in the pixel P, microlenses are disposed in at least one light-emitting region, and no microlenses are disposed on the remaining light-emitting regions.

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, and no microlens is provided in the fourth light-emitting area EA42.

The second microlens, the first microlens, and the third microlens 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 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 compared to the first The diameter D3 of the third concave portion 401 of the three microlenses 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, where the number of microlenses per unit area of the first light emitting area EA12 The number of microlenses per unit area of the second light emitting area EA21 is larger.

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

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 electroluminescence device provided 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 diameters, depths, FWHMs, gaps, slopes, and aspect ratios of the first to third recesses different from corresponding ones of the other recesses. No settings.

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 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 embodiments. A description of some components will be omitted because they are the same as those of the foregoing embodiment. In addition, hereinafter, the same reference numerals or signs will be used to indicate the same or similar components.

Please refer to FIG. 12 and FIG. 13. In an organic light emitting display device according to a sixth exemplary embodiment of the present invention, a single pixel P includes a plurality of light emitting regions EA11, EA22, EA31, and EA41. The first, third, and fourth light-emitting areas EA11, EA31, and EA41 are provided without microlenses in the second light-emitting area EA22.

The first light leakage preventing layer 110, the second light leakage preventing layer 111, the third light leakage preventing layer 112, and the fourth light leakage preventing layer 113 are disposed on portions 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 light emission efficiency is lower than the light emission efficiency of the second light emitting region EA22. As a result, the luminous efficiency can be improved.

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 a view showing an organic light emitting display device according to the 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. A description of some components will be omitted because they are the same as those of the foregoing embodiment. In addition, hereinafter, the same reference numerals or signs will be used to indicate the same or similar components.

Referring to FIG. 14, an organic light emitting display device according to a seventh exemplary embodiment of the present invention has each of a plurality of first to fourth light emitting regions EA11, EA21, EA31, and EA43 included in a single pixel P. Micro lenses. 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 microlenses.

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 an organic light emitting display device according to a seventh exemplary embodiment of the present invention, the fourth light leakage prevention layer 210 provided in at least one sub-pixel of a plurality of sub-pixels of a single pixel may be composed of A light reflecting material is formed. In addition, the first to third light leakage preventing layers 110, 111, and 112 among the other sub pixels of 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 portions of the insulating layer 200 corresponding to the light-emitting areas 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 preventing 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. Specifically, 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, and is 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 is provided in the fourth sub-pixel SP4 as described above, light leakage caused by sub-pixels other than the fourth sub-pixel SP4 The composition can be reoriented from the first metal layer 211 or the second metal layer 212 toward the substrate 100 so as to reach a polarizer (not shown) disposed below 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 not the same as 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 a polarizer (not shown) The boundary of the lens is redirected to reach the microlens of the fourth sub-pixel SP4. The light that has reached the microlenses can be extracted from the substrate 100 through the microlenses, resulting in 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 reflects from the first metal layer 211 or the second metal layer 212, the external light 850 cannot pass through a polarizer (not shown) provided on the bottom surface of the substrate 100. . Since the external light 850 cannot leave the display device, the reflectance of the external light 850 can be reduced.

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

The first metal layer 211 may be formed of an alkaline earth metal having an absolute value of a negative dielectric constant greater than an absolute value of the dielectric constant of the insulating layer 200. However, the material of the first metal layer 211 according to this embodiment of the present 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 having a negative dielectric constant.

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

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

In contrast, the first metal layer 211 having a negative dielectric coefficient is disposed in the fourth sub-pixel SP4 between the insulating layer 200 and the second metal layer 212, and the absolute value of the dielectric coefficient of the first metal layer 211 is greater than the insulation The absolute value of the dielectric coefficient of the layer 200. Therefore, this configuration can reduce the amount of light loss, thereby improving the transmittance of the fourth sub-pixel SP4. Therefore, light generated by the electroluminescent device EL can be extracted from the substrate 100 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 the dielectric constant and the 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 a range of 1 nanometer (nm) to 30 nanometers (nm). Since the first metal layer 211 and the second metal layer 212 are formed to be thin, the transmittance of the fourth light leakage prevention layer 210 can be improved.

When light generated by the electroluminescent device EL reaches the second metal layer 212 of the fourth light leakage prevention layer 210 through the cover layer 320, a part of the light is reflected from the second metal layer 212, and the remaining light passes through the second metal layer 212 Reached 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 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 and second metal layers 211 and 212 provided on the insulating layer 200, it is possible to reduce light leakage components and reflectance, and at the same time, light generated by the electroluminescent device EL The transmittance can be improved.

The structures of the insulating layer 200 and the fourth light leakage prevention layer 210 provided in the fourth sub-pixel SP4 are not limited to those described above.

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 a configuration of an insulating layer and a fourth light leakage prevention layer provided in a fourth sub-pixel according to the present alternative embodiment of the present invention.

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

The cover layer 420 having microlenses is provided on the first to third light leakage preventing 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 disposed 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 a portion 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 disposed in the fourth sub-pixel SP4 can be formed using a process of forming the insulating layer 300 in the first to third sub-pixels SP1, SP2, and SP3 without the need for any additional deal with.

A cover layer 420 having a microlens is disposed on the insulating layer 300 of the fourth sub-pixel SP4, and an electroluminescent device EL provided with 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 provided in the first to fourth sub-pixels SP1 to SP4 may be determined according to the shape of the microlens provided 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 or more 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. 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 embodiment of the present invention is not limited thereto. For example, the fourth metal layer 312 may be selected from beryllium (Be), calcium (Ca), barium (Ba), strontium (Sr), radium (Ra), lithium (Li), sodium (Na), and magnesium At least one material (Mg) having a negative dielectric constant is formed.

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 a 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 thin, 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 disposed on the substrate 100, the fourth metal layer 312 is disposed on the third metal layer 311, and the insulating layer 300 is disposed on the fourth metal layer 312. . This can thus reduce light leakage components and reflectance, while increasing the transmittance of light generated by the organic electroluminescent device EL.

In the organic light emitting display device, any configuration may be used as long as the light leakage prevention layer provided in at least one of the sub-pixels includes two or more layers formed of a metal, which has an absolute value of a negative dielectric constant greater than One metal layer of the absolute value of the dielectric constant of the insulating layer is disposed between the insulating layer and another metal layer having a higher reflectance level.

Hereinafter, the reflectance reducing effect of the organic light emitting display devices of these examples of the present invention is compared with the reflectance reducing effect of the organic light emitting display devices of the comparative examples. FIG. 17 is a diagram 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, an organic light-emitting display device (comparative example) in which each metal layer having only a high reflectance level as a light leakage prevention layer is compared with the light leakage prevention layer in each of which includes the first stacked on each other The metal layer and the second metal layer. The first metal layer has a negative dielectric constant, the absolute value of which is greater than the absolute value of the dielectric constant of an insulating layer in contact with the light leakage prevention layer, and the second metal layer has a higher dielectric constant. Horizontal reflectivity (these examples of the invention).

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

In an organic light-emitting display device having a microlens, 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. Therefore, as in the embodiments of the present invention described above, 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 it has 5 nm formed of only silver (Ag). The organic light emitting display device of the comparative example of the (nm) and 10 nanometer (nm) light leakage prevention layer reflects about 5% to about 30% of external light. This means that the ratio of the optical axis of the external light incident on the display device to 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 include organic light emitting display devices in which calcium (Ca) and silver (Ag) are laminated with a light leakage prevention layer laminated in a thickness of 5 (nm) to 10 nm (nm), Reflects approximately 50% to approximately 80% of external light incident at a large angle. This means that the ratio of the optical axis of external light incident on the display device to the optical axis of the polarizer is different from about 50% to about 80%.

As described above, it should be understood that each light leakage prevention layer of the organic light emitting display device 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, an 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 reflectance 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 provided in an area corresponding to a light emitting area in at least one of the plurality of sub pixels to prevent or reduce different sub pixels. Or leakage of light between different pixels, while preventing a reduction in light extraction efficiency generated by an organic electroluminescence (EL) device.

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. No micro lens is provided, so that 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 within the scope of the present invention.

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

100‧‧‧ substrate

110‧‧‧The first light leakage prevention layer

111‧‧‧Second light leakage prevention layer

112‧‧‧The third light leakage prevention layer

113‧‧‧Fourth anti-light leakage layer

120‧‧‧ Overlay

130‧‧‧first electrode

140‧‧‧organic light emitting layer

150‧‧‧Second electrode

160‧‧‧ Dike pattern

200‧‧‧ Insulation

201‧‧‧ the first recess

202‧‧‧First connection

210‧‧‧Fourth anti-light leakage layer

211‧‧‧first metal layer

212‧‧‧Second metal layer

220‧‧‧ Overlay

230‧‧‧first electrode

240‧‧‧organic light emitting layer

250‧‧‧Second electrode

300‧‧‧ Insulation

301‧‧‧Second Recess

302‧‧‧Second connection section

310‧‧‧Fourth anti-light leakage layer

311‧‧‧third metal layer

312‧‧‧fourth metal layer

320‧‧‧ Overlay

330‧‧‧ Electroluminescent device EL

340‧‧‧ Electroluminescence device EL

350‧‧‧ Electroluminescent device EL

401‧‧‧ the third recess

420‧‧‧ Overlay

430‧‧‧first electrode

440‧‧‧Organic emitting layer

450‧‧‧Second electrode

530‧‧‧ EL

540‧‧‧ Electroluminescence device EL

550‧‧‧ Electroluminescence device EL

800‧‧‧ light

850‧‧‧External light

1000‧‧‧ display device

1100‧‧‧ display panel

1200‧‧‧first drive 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‧‧‧The third light-emitting area

EA32‧‧‧ Third light emitting area

EA33‧‧‧The third light-emitting area

EA34‧‧‧The third light-emitting area

EA41‧‧‧The fourth light-emitting area

EA42‧‧‧ Fourth light emitting area

EA43‧‧‧ Fourth light emitting area

SP1‧‧‧first sub pixel

SP2‧‧‧Second Sub Pixel

SP3‧‧‧ third sub pixel

SP4‧‧‧ Fourth Sub Pixel

D1‧‧‧ diameter of first recess 201

D2‧‧‧ diameter of second recess 301

D3‧‧‧ diameter of the third recess 401

VL1 ... VLm‧‧‧First Line

HL1 ... HLn‧‧‧Second Line

A-B‧‧‧line

C-D‧‧‧line

E-F‧‧‧line

G-H‧‧‧line

I-J‧‧‧line

K-L‧‧‧line

M-N‧‧‧line

P‧‧‧Pixels

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

Claims (26)

An organic light-emitting display device includes: a substrate divided into a plurality of sub-pixels generating light of different colors; and a light leakage prevention layer disposed on the substrate and emitting light from at least one of the sub-pixels of the sub-pixels On a portion corresponding to the region; a cover layer disposed on a portion of the substrate corresponding to at least one of the sub-pixels, and including a plurality of micros with a plurality of concave portions or a plurality of convex portions A lens; and an organic electroluminescence device disposed on the cover layer. The organic light-emitting display device according to claim 1, wherein the sub-pixels are divided into red, green, blue, and white sub-pixels, and the light leakage prevention layer includes the sub-pixels respectively disposed in the sub-pixels. The first to fourth light leakage prevention layers. At least one of the first to fourth light leakage prevention layers is thinner than the other light leakage prevention layers of the first to fourth light leakage prevention layers. The organic light emitting display device according to claim 2, wherein at least two of the first to fourth light leakage prevention layers allow a light of the same color to pass through. The organic light emitting display device according to claim 2, wherein at least one light leakage prevention layer of the first to fourth light leakage prevention layers is allowed to communicate with the remaining light leakage prevention layers of the first to fourth light leakage prevention layers. Light of at least one color passes through complementary light of at least one color. The organic light-emitting display device according to claim 2, wherein the microlenses include a plurality of first microlenses and a plurality of second microlenses, and the second microlenses are disposed in the first microlens where the first microlenses are not provided. In at least one of the sub-pixels, the second microlenses are different from the first microlenses. The organic light-emitting display device according to claim 5, wherein at least one of a diameter, a depth, a half height and a width, a slope, and an aspect ratio of the plurality of convex portions of the second microlenses and the first A distance between adjacent convex portions of the convex portions of the two microlenses and a diameter, a depth, a half height, a slope, and an aspect ratio of the plurality of convex portions of the first microlenses. A distance between adjacent convex portions of the convex portions of the corresponding one and the first microlenses is different. The organic light-emitting display device according to claim 5, wherein at least one of a diameter, a height, a half height and a width, a slope, and an aspect ratio of the plurality of concave portions of the second microlenses and the second A distance between adjacent concave portions of the concave portions of the microlens and a diameter, a height, a half-height, a slope, and a corresponding one of the aspect ratios of the plurality of concave portions of the first microlenses and the A distance between adjacent concave portions of the concave portions of the first microlenses is different. The organic light-emitting display device according to claim 5, wherein the microlenses further include a plurality of third microlenses, and the third microlenses are disposed in the subpixels and neither the first microlenses nor the first microlenses are provided. In the at least one sub-pixel of the second microlenses, the third microlenses are the same as the first microlenses or the second microlenses or the first microlenses and the second microlenses. The lenses are different. The organic light emitting display device according to claim 7, wherein at least one of a diameter, a depth, a half height and a width, a slope, and an aspect ratio of the plurality of convex portions of the third microlenses and the first A diameter, a depth, a half height and a width, a slope between a distance between adjacent convex portions of the convex portions of the two microlenses and a plurality of convex portions of the first microlenses or the second microlenses And a distance between a corresponding one of the aspect ratios and adjacent convex portions of the convex portions of the first microlenses is different. The organic light-emitting display device according to claim 7, wherein at least one of a diameter, a height, a half height and a width, a slope, and an aspect ratio of the plurality of concave portions of the third microlenses and the second A distance between adjacent concave portions of the concave portions of the microlens and a diameter, a height, a half height and width, a slope, and an aspect ratio of the plurality of concave portions of the first microlenses and the second microlenses A distance between a corresponding one of the ratios and an adjacent concave portion of the concave portions of the first microlenses is different. The organic light-emitting display device according to claim 1, wherein the sub-pixels are divided into red, green, blue, and white sub-pixels, and the light leakage prevention layer is not provided on the red, green, and blue , And the white sub-pixel. The organic light emitting display device according to claim 11, wherein the microlenses are not disposed in at least one of the red, the green, the blue, and the white subpixels in which the light leakage prevention layer is not disposed. Suzhong. The organic light-emitting display device according to claim 12, wherein at least one of the red, the green, the blue, and the white sub-pixels is neither provided with the light leakage prevention layer nor the microlenses. The element system is the white sub-pixel. The organic light emitting display device according to claim 1, wherein the microlenses are not disposed in at least one of the subpixels. The organic light-emitting display device according to claim 1, wherein the light leakage prevention layer provided in the at least one sub-pixel of the sub-pixels includes a first metal layer and a second metal layer or a first metal layer. Three metal layers and a fourth metal layer. The organic light emitting display device according to claim 15, further comprising: an insulating layer disposed on the substrate; and the at least one sub-pixel of the first metal layer and the second metal layer disposed in the sub-pixels. In the pixel, the first metal layer is disposed on the insulating layer and includes one or more layers, and the second metal layer is disposed on the first metal layer and one or more layers. The organic light-emitting display device according to claim 16, wherein a dielectric constant of the first metal layer is negative, and an absolute value of the dielectric coefficient of the first metal layer is greater than a dielectric constant of the dielectric layer of the insulating layer. Absolute value. The organic light emitting display device according to claim 16, wherein the second metal layer is formed of at least one material selected from the group consisting of silver (Ag), aluminum (Al), and gold (Au), the first metal The layer is at least selected from the group consisting of beryllium (Be), calcium (Ca), barium (Ba), strontium (Sr), radium (Ra), lithium (Li), sodium (Na), and magnesium (Mg). A material is formed. The organic light emitting display device according to claim 15, further comprising: the third metal layer is disposed in the at least one sub pixel of the sub pixels on the substrate; the fourth metal layer is disposed in the first Three metal layers; and an insulating layer disposed on the fourth metal layer. The organic light-emitting display device according to claim 19, wherein a dielectric constant of the fourth metal layer is negative, and an absolute value of the dielectric coefficient of the fourth metal layer is larger than a dielectric constant of the dielectric layer. Absolute value. The organic light emitting display device according to claim 19, wherein the third metal layer is formed of at least one material selected from the group consisting of silver (Ag), aluminum (Al), and gold (Au), and the fourth The metal layer is selected from the group consisting of beryllium (Be), calcium (Ca), barium (Ba), strontium (Sr), radium (Ra), lithium (Li), sodium (Na), and magnesium (Mg) At least one material is formed. The organic light emitting display device according to claim 19, wherein in the remaining sub pixels of the sub pixels other than the at least one sub pixel, the insulating layer is disposed on the substrate, and the light leakage prevention A layer is disposed on the insulating layer, wherein a part of the insulating layer provided in the at least one sub-pixel is integrally formed with a remaining portion of the insulating layer provided in the remaining sub-pixels. The organic light emitting display device according to claim 1, wherein the light leakage prevention layer includes at least one of a type I light leakage prevention layer, a type II light leakage prevention layer, and a type III light leakage prevention layer, wherein The type I light leakage prevention layer is configured to allow light of a specific wavelength to pass while absorbing light of the remaining wavelength, and the type II light leakage prevention layer is configured to allow light of a specific wavelength to pass through, while absorbing a part of visible light to allow the remaining visible light to pass, The type III light leakage prevention layer is configured to allow light to pass or reflect while changing the optical axis of the light, and the light having the changed optical axis is then absorbed by a polarizer. The organic light emitting display device according to claim 23, wherein the light leakage prevention layer includes at least one of the type I light leakage prevention layer, and at least one of the type II light leakage prevention layer and the type III light leakage prevention layer. . The organic light emitting display device according to claim 23, wherein the I-type light leakage prevention layer selectively allows light of a specific color to pass while absorbing light of other wavelengths, so that a major part of the specific color passes and the remaining wavelength Most of the light is absorbed. The organic light emitting display device according to claim 23, wherein the type III light leakage prevention layer allows the light to pass or reflect while changing the optical axis of the light.