KR102649572B1 - Organic light emitting display device - Google Patents

Abstract

Embodiments of the present invention relate to an organic light emitting display device, and more specifically, to an insulating layer disposed on a substrate and an organic light emitting diode disposed on the insulating layer and including a first electrode, a light emitting layer, and a second electrode. In the light emitting area located in the bending area and emitting light from each subpixel area provided on the substrate, the insulating layer has at least one embossed portion having an embossed surface shape, a first electrode, a light emitting layer, and a first electrode. At least one of the two electrodes has a shape corresponding to the embossed portion of the insulating layer. According to these embodiments of the present invention, front visibility of the organic light emitting display device corresponding to the bending area can be improved.

Description

Organic light emitting display device {ORGANIC LIGHT EMITTING DISPLAY DEVICE}

The present invention relates to an organic light emitting display device.

With the gradual development of technology, the demand for display devices for displaying images is increasing in various forms, and in recent years, liquid crystal displays (LCDs), plasma displays (PDPs: plasma display panels), and organic light emitting displays have been growing. Various display devices such as OLED (Organic Light Emitting Diode Display Device) are being used.

These display devices are being applied to a variety of fields, including not only mobile devices such as smartphones and tablet PCs, but also TVs, automobile displays, and wearable devices. In order to be applied to various fields, structural modifications are required.

Recently, bendable, foldable, curved, rollable, and flexible display devices (hereinafter referred to as bendable, foldable curved, rollable, and flexible display devices) (named by unifying the terminology as a bendable display device) is attracting attention.

However, in the bending area of the bendable device, the optical path length varies depending on the viewing angle, so the image appears differently depending on the viewing angle, which may deteriorate visual perception. This phenomenon occurs when the viewer faces the front of the display device. This may become more noticeable when viewing images in .

Accordingly, when viewing the bendable display device from the front, the viewer can feel a significant difference between the image displayed in the non-bending area and the image displayed in the bending area.

Against this background, the purpose of embodiments of the present invention is to provide an organic light emitting display device having a structure that can improve the visibility of an image displayed in a bending area when a viewer views a bendable display device from the front.

Another object of embodiments of the present invention is to provide an organic light emitting display device having a structure that can reduce the difference in visual perception between images displayed in a bending area and a non-bending area.

In one aspect, in the organic light emitting display device according to embodiments of the present invention, the organic light emitting display device includes at least one bending area capable of bending, and is disposed on an insulating layer and an insulating layer disposed on a substrate, In the light-emitting area, which includes an organic light-emitting diode including a first electrode, a light-emitting layer, and a second electrode, and is located in a bending area and emits light from each subpixel area provided on the substrate, the insulating layer has an embossed surface shape. has at least one embossed portion, and at least one of the first electrode, the light emitting layer, and the second electrode has a shape corresponding to the embossed portion of the insulating layer.

The plurality of light-emitting areas disposed in the bending area include a first light-emitting area and a second light-emitting area, and the distance that the first light-emitting area is from the non-bending area, which is an area other than the bending area, is the distance that the second light-emitting area is from the non-bending area. It is greater than the distance, and the number of embossed parts in the insulating layer in the first light-emitting area may be greater than the number of embossed parts in the insulating layer in the second light-emitting area.

In addition, the bending curvature in the first light-emitting area is smaller than the bending curvature in the second light-emitting area, and the spacing of the embossing portions of the insulating layer in the first emitting region may be smaller than the spacing of the embossing portions of the insulating layer in the second light-emitting region. .

In another aspect, the display device according to embodiments of the present invention includes at least one bendable area, is disposed on an insulating layer and an insulating layer disposed on a substrate, and includes a first electrode, a light emitting layer, and a second In the light-emitting area, which includes an organic light-emitting diode including an electrode, is located in a bending area, and emits light from each subpixel area provided on the substrate, the light-emitting layer has at least one embossing portion.

According to the above-described embodiments of the present invention, an organic light emitting display device having a structure that can improve the visibility of an image displayed in a bending area when a viewer views a bendable display device from the front can be provided.

According to embodiments of the present invention, an organic light emitting display device having a structure that can reduce the difference in visual perception between images displayed in a bending area and a non-bending area can be provided.

1 is a schematic perspective view of a display device according to embodiments of the present invention.
Figure 2 is a diagram illustrating an unfolded state and a bent state of a display device according to embodiments of the present invention, respectively.
Figure 3 is a schematic plan view of a display device according to embodiments of the present invention.
Figure 4 is a plan view showing a partial area of one subpixel located in a bending area of a display device according to embodiments of the present invention.
Figure 5 is a cross-sectional view taken along AB in Figure 4.
Figure 6 is a cross-sectional view of a display device according to other embodiments of the present invention.
FIG. 7 is a diagram illustrating a path of light emitted from an organic light emitting diode in a bending area of a display device according to embodiments of the present invention.
FIG. 8 is an enlarged view of area X in FIG. 5.
9 is a cross-sectional view of one subpixel in a bending area of a display device according to still other embodiments of the present invention.
10 and 11 are plan views showing a partial area of one subpixel located in a bending area of a display device according to other embodiments of the present invention.
Figure 12 is a cross-sectional view taken along CD of Figure 10.
FIG. 13 is a plan view illustrating a partial area of one subpixel located in a non-bending area of a display device according to embodiments of the present invention.
Figure 14 is a cross-sectional view taken along EF of Figure 13.
Figure 15 is a schematic plan view of a display device according to other embodiments of the present invention.
FIG. 16 is a plan view showing an arbitrary subpixel located in a bending area of the display device of FIG. 15.
Figure 17 is a cross-sectional view taken along EF of Figure 16.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. In adding reference numerals to components in each drawing, identical components may have the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

Additionally, when describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the components are not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component may be directly connected or connected to that other component, but there are no other components between each component. It should be understood that may be “interposed” or that each component may be “connected,” “combined,” or “connected” through other components.

When an element or layer is referred to as another element or “on” or “on” it includes not only those directly on top of another element or layer, but also all cases where there is another layer or element in between. do. On the other hand, referring to an element as “directly on” or “directly on” indicates that there is no intervening element or layer.

Spatially relative terms such as “below, beneath,” “lower,” “above,” and “upper” refer to one element or component as shown in the drawing. It can be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood as terms that include different directions of the element during use or operation in addition to the direction shown in the drawings. For example, if an element shown in the drawings is turned over, an element described as “below” or “beneath” another element may be placed “above” the other element. Accordingly, the illustrative term “down” can include both downward and upward directions.

Additionally, when describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the components are not limited by the term.

1 is a schematic perspective view of a display device according to embodiments of the present invention.

Referring to FIG. 1, the display device 100 according to embodiments of the present invention may be a display device 100 that can be stably driven even when bent by an external force. This display device 100 includes at least one bending area and at least one non-bending area.

In the following description, as an example of the display device 100 according to embodiments of the present invention, the display device 100 includes one non-bending area (NBA) and a first non-bending area (NBA) located on both sides of the non-bending area (NBA). and the second bending areas BA1 and BA2.

Meanwhile, in FIG. 1, the display device 100 according to embodiments of the present invention is shown as a bendable display device 100 including at least one bending area BA1 and BA2, but this is only an example. The display device 100 according to embodiments of the present invention may be various display devices such as a foldable display device, a curved display device, a rollable display device, and a flexible display device.

In addition, bending the display device 100 according to embodiments of the present invention means that the display device 100 is a display device in a bent or folded state, a display device that can be bent or unfolded, or a display device that can be folded or unfolded. Can include all.

Although not separately shown, the display device 100 according to the present invention can be used in large electronic devices such as televisions or external billboards, as well as mobile phones, personal computers, laptop computers, personal digital terminals, car navigation units, game consoles, portable electronic devices, It can be used in small and medium-sized electronic devices such as wristwatch-type electronic devices and cameras.

Referring to FIG. 1, the display device 100 includes a plurality of distinct areas on the display screen. The display device 100 may be divided into a display area (AA) and a non-display area (NA) depending on whether the corresponding area displays an image.

The display device 100 displays an image through the display area AA. The non-display area (NA) does not display images. Drivers and/or wires for driving the display area AA may be disposed in the non-display area NA. This non-display area (NA) may surround the display area (AA).

Referring to FIG. 1 , the display area AA of the display device 100 may be located in the first and second bending areas BA1 and BA2 and the non-bending area NBA. That is, images can be displayed in both the first and second bending areas BA1 and BA2 and the non-bending area NBA of the display device 100.

This display device 100 includes a display panel 110 that displays an image, and the display panel 110 may be of various types, such as an organic light emitting diode panel (OLED panel) or a liquid crystal display panel (LCD panel). Below, for convenience of explanation, the organic light emitting diode panel (OLED Panel) is mainly used as an example.

Meanwhile, although not shown in the drawing, the organic light emitting diode panel includes multiple data lines and multiple gate lines, and multiple subpixels defined by the multiple data lines and multiple gate lines are arranged.

Additionally, each subpixel may include circuit elements such as an organic light emitting diode (OLED), which is a self-light emitting device, and a driving transistor for driving the organic light emitting diode (OLED).

The type and number of circuit elements constituting each subpixel may be determined in various ways depending on the provided function and design method.

Additionally, a plurality of subpixels may be provided in each of the first and second bending areas BA1 and BA2 and the non-bending area NBA of the display device 100.

Meanwhile, as described above, the display device 100 includes first and second bending areas BA1 and BA2 located on both sides of the non-bending area NBA with the non-bending area NBA in between. It can be bent in the area where the areas (BA1, BA2) are located.

The display device 100 may be a display device that is bent in the bending areas BA1 and BA2, or may be a display device that can be bent and then unfolded again.

Figure 2 is a diagram illustrating an unfolded state and a bent state of a display device according to embodiments of the present invention, respectively.

Referring to FIG. 2, in the display device 100 according to embodiments of the present invention, the first bending area BA1 is located on one side of the non-bending area NBA with the non-bending area NBA in between. , the second bending area BA2 is disposed on the other side of the non-bending area NBA.

Accordingly, when the display device 100 is in a bent state, the display device 100 may be bent on both sides where the first and second bending areas BA1 and BA2 are located.

Meanwhile, since most of the light (a) emitted from the organic light emitting diode in the non-bending area (NBA) of the display device 100 comes out in the front direction of the display device 100, the viewer When viewing the front of the display device 100, the viewer can view an image with high visibility.

However, in the first and second bending areas BA1 and BA2, there is more light c going out in the side direction than light b going out in the front direction of the display device 100, so the viewer can see the display device 100 from the front. When viewed, differences in color and luminance of the image occur in the non-bending area NBA and the first and second bending areas BA1 and BA2.

That is, since the optical path length varies depending on the viewing angle on the side of the display device 100 corresponding to the first and second bending areas BA1 and BA2, the image appears differently depending on the viewing angle. The visibility from the side of the display device 100 corresponding to the first and second bending areas BA1 and BA2 may be worse than the visibility from the front of the display device 100 corresponding to the non-bending area NBA.

The display device 100 according to embodiments of the present invention can improve the color and luminance difference (relative to the image viewed from the front) of the image occurring in the non-bending area (NBA) and the bending area (BA1, BA2). The structure of the display device 100 is provided.

This structure is examined with reference to FIG. 3 as follows.

Figure 3 is a schematic plan view of a display device according to embodiments of the present invention.

Referring to FIG. 3, the display device 100 includes a display area (AA) and a non-display area (NA). The non-bending area NBA and the first and second bending areas BA1 and BA2 include the display area AA.

That is, the display device 100 can display images in both the bent area and the non-bended area.

Since the non-display area NA is provided to surround the display area AA, the non-display area NA may also be provided in the non-bending area NBA and the first and second bending areas BA1 and BA2.

This display device 100 includes an insulating layer 310 disposed on the display panel substrate. The insulating layer 310 may be disposed in the non-bending area NBA and the first and second bending areas BA1 and BA2.

Specifically, the insulating layer 310 may be disposed on all of the display area AA of the non-bending area NBA and part or all of the non-display area NA, and may be disposed on the first and second bending areas BA1. , BA2) may be arranged in all of the display area (AA) and part or all of the non-display area (NA).

At least one embossing portion 320 may be provided on the surface of the insulating layer 310.

In addition, the surface of the insulating layer 310 may further include a flat connecting portion 330 surrounding the embossed portion 320.

On the other hand, when two or more embossed parts 320 are provided on the surface of the insulating layer 310, the connecting part 330 may serve to connect one embossed part 320 and the other neighboring embossed parts 320. there is.

The embossing portion 320 may be located in the first and second bending areas BA1 and BA2, respectively. In other words, the embossing portion 320 may not be located in the non-bending area (NBA).

The embossing portion 320 disposed in the first and second bending areas BA1 and BA2 will be examined in detail as follows. Meanwhile, below, for convenience of explanation, the first and second bending areas BA1 and BA2 may be referred to as a bending area, and the bending area is at least one of the first bending area BA1 and the second bending area BA2. It can be used to mean one thing.

Figure 4 is a plan view showing a partial area of one subpixel located in a bending area of a display device according to embodiments of the present invention.

Referring to FIG. 4, an embossing portion 320 may be provided on the surface of the insulating layer 310 in the bending area BA. And, it may include a connection part 330 arranged to surround the embossed part 320.

Meanwhile, in FIG. 4, the embossing part 320 is shown to be circular in plan, but the present invention is not limited thereto, and the planar shape of the embossing part 320 may be oval or polygonal.

Next, referring to FIG. 5, an insulating layer 310 provided with at least one embossing portion 320 in one subpixel (SP) area disposed in the bending area BA and an insulating layer 310 disposed on the insulating layer 310. Review the arrangement relationship of organic light emitting diodes.

Figure 5 is a cross-sectional view taken along line A-B of Figure 4.

Referring to FIG. 5 , the display device 100 includes at least one thin film transistor (Tr) disposed on a substrate 500 and an organic light emitting diode (OLED) electrically connected to the thin film transistor (Tr). The thin film transistor (Tr) includes a semiconductor layer 505, a gate electrode 507, a source electrode 509, and a drain electrode 510, and the organic light emitting diode (OLED) includes a first electrode 520 and a light emitting layer 530. ) and a second electrode 550.

Specifically, a buffer layer 501 is disposed on the substrate 500 of the display device 100, and a semiconductor layer including a source region 502, a channel region 503, and a drain region 504 is disposed on the buffer layer 501. 505 and a gate insulating film 506 disposed on the semiconductor layer 505 are disposed. Here, the semiconductor layer 505 may be an oxide semiconductor layer, but the present invention is not limited thereto.

A gate electrode 507 is disposed on the gate insulating film 506 to overlap the channel region 504 of the semiconductor layer 505, and an interlayer insulating film 508 is disposed on the gate electrode 507. A source electrode 509 connected to the source region 502 of the semiconductor layer 505 and a drain electrode 510 connected to the drain region 502 of the semiconductor layer 505 are disposed on the interlayer insulating film 508.

An insulating layer 510 is disposed on the source electrode 509 and the drain electrode 510. Here, the insulating layer 310 may be made of an organic material and has the effect of flattening the substrate 500. This insulating layer 310 may also be referred to as an overcoat layer or planarization layer.

A first electrode 520 and a bank 515 of an organic light emitting diode (OLED) are disposed on the insulating layer 310. The bank 515 may be disposed on a portion of the top surface of the first electrode 520 and the insulating layer 310 to expose a portion of the top surface of the first electrode 520 .

The bank 515 may define an emission area (EA) and a non-emission area (NEA). That is, the area opened by the bank 515 may be an emission area (EA), and the area corresponding to the area where the bank 515 is located may be a non-emission area (NEA).

A light emitting layer 530 is disposed on the upper surface of the first electrode 520 exposed by the bank 615, and a second electrode 550 is disposed on the light emitting layer 530 and the bank 515.

Although FIG. 5 shows a configuration in which the light emitting layer 530 is disposed only on the top surface of the first electrode 520 exposed by the bank 515, the present invention is not limited to this. For example, the light emitting layer 530 may be disposed not only on the top surface of the first electrode 520 exposed by the bank 515 but also on the bank 515 .

Meanwhile, the surface of the insulating layer 310 in the light emitting area EA may include a flat portion and a non-flat portion.

Specifically, at least one embossed portion 320 is provided on the surface of the insulating layer 310 in the light emitting area EA. Additionally, a connection portion 330 surrounding the embossed portion 320 may be provided on the surface of the insulating layer 310.

Here, the embossing portion 320 may have a concave shape in cross-section, and the connecting portion 330 may have a flat shape in cross-section.

By providing at least one embossing portion 320 on the surface of the insulating layer 310, the first electrode 520, the light emitting layer 530, and the second organic light emitting diode (OLED) disposed on the insulating layer 310 At least one of the electrodes 550 may have a shape corresponding to the embossed portion 320 of the insulating layer 310 in the light emitting area EA of the bending area BA.

Specifically, as shown in FIG. 5, the first electrode 520, the light emitting layer 530, and the second electrode 550 disposed on the insulating layer 310 are located in the light emitting area (EA) of the bending area (BA). It may include flat portions and non-flat portions along the surface shape of the insulating layer 310.

In other words, each of the first electrode 520, the light emitting layer 530, and the second electrode 550 of the organic light emitting diode (OLED) is embossed on the insulating layer 310 in the light emitting area (EA) of the bending area (BA). The embossed part and the connecting part may be provided at a position corresponding to the area where the part 320 and the connecting part 330 are located.

Meanwhile, although not shown in the drawing, the light emitting layer 530 may be composed of a plurality of layers including a forward injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer disposed on the first electrode 520. , multiple layers included in the light-emitting layer 530 may have a shape corresponding to the surface shape of the insulating layer 310 in the light-emitting area EA.

Meanwhile, in FIG. 5, one embossing portion 320 is provided on the surface of the insulating layer 310 in the light emitting area (EA) of the bending area (BA), and an organic light emitting diode (OLED) is disposed on the insulating layer 310. ) has been described as having a shape corresponding to the surface shape of the insulating layer 310 (for example, the embossing portion 320), but the present invention is not limited thereto.

For example, in the display device 100 according to embodiments of the present invention, as shown in FIG. 6, the light emitting layer 530 may be provided with at least one embossing portion in the light emitting area EA of the bending area BA. It may be possible.

Specifically, when examining the above-described structure with reference to FIG. 6, it is as follows.

Figure 6 is a cross-sectional view of a display device according to other embodiments of the present invention. In the description below, content (configuration, effects, etc.) that overlaps with the previously described embodiments may be omitted.

Referring to FIG. 6 , the light emitting layer 530 may include at least one embossing portion 620 in the light emitting area EA located in the bending area BA. Additionally, the second electrode 550 disposed on the light emitting layer 530 may have an embossed portion along the surface shape of the light emitting layer 530.

In this case, unlike the display device 100 of FIG. 5, the insulating layer 310 and the first electrode 520 in the light emitting area EA may have flat surfaces.

Referring to FIGS. 5 and 6 , the light emitting layer 530 of an organic light emitting diode (OLED) may commonly include at least one embossing portion 620 in the light emitting area (EA) of the bending area (BA).

On the other hand, the organic light emitting diode (OLED) may generate light in the light emitting layer 530, and the light proceeds toward the second electrode 550 and goes out of the display device 100 (top light emitting method) or is transmitted to the substrate 500. ) direction and can go out of the display device 100 (bottom light emitting method).

As shown in FIGS. 5 and 6, the light-emitting layer 530 from which light is generated is provided with at least one embossing portion 620 in the light-emitting area EA of the bending area BA. A large amount of light may be emitted in the front direction of the display device 100.

When examining this with reference to FIG. 7, it is as follows.

FIG. 7 is a diagram illustrating a path of light emitted from an organic light emitting diode in a bending area of a display device according to embodiments of the present invention.

Below, for convenience of explanation, a specific optical path will be described by taking as an example that the display device 100 according to embodiments of the present invention is a top-emitting organic light emitting display device.

Referring to FIG. 7, part of the light emitted from the light emitting layer 530 is directed toward the second electrode 550 and goes out of the display device 100, and the remaining light is directed toward the first electrode 520. The light is reflected by the first electrode 520 to change the optical path, and finally goes toward the second electrode 550 and goes out of the display device 100.

Meanwhile, in the display device 100 according to embodiments of the present invention, the embossed portion 320 of the insulating layer 310 or the embossed portion 620 of the light emitting layer 530 is formed in the light emitting area (EA) of the bending area (BA). As a result, the directivity of light emitted from the organic light-emitting diode (OLED) changes.

Specifically, when the surfaces of the first electrode 520, the light emitting layer 530, and the second electrode 550 in the light emitting area EA are flat, the light emitted from the organic light emitting diode (OLED) is transmitted to the display device 100. There is a lot of it facing towards the front. Therefore, as shown in FIG. 7 , in the non-bending area NBA there may be a large amount of light directed toward the front of the display device 100.

When the organic light emitting diode (OLED) has the same light directivity in the bending area (BA) and the light emitting area (EA) as when the first electrode 520, the light emitting layer 530, and the second electrode 550 are flat, the organic light emitting diode (OLED) The amount of light emitted from the light emitting diode (OLED) is directed toward the side of the display device 100 (see FIG. 2).

As a result, when a viewer views an image from the front of the display device 100, differences in color and brightness of the image displayed in the non-bending area (NBA) and the bending area (BA) occur.

However, as shown in FIGS. 5 to 7, the light emitting layer of the organic light emitting diode (OLED) is formed in the light emitting area EA by the embossed portion 320 of the insulating layer 310 or the embossed portion 620 of the light emitting layer 530. If 530 is non-flat, the directivity of light emitted from the organic light-emitting diode (OLED) may be changed and a large amount of light may be directed toward the front of the display device 100.

Specifically, as shown in the enlarged view of a portion of the light emitting area (EA) of the bending area (BA) in FIG. 7, the light emitted from the organic light emitting diode (OLED) is directed in the height direction of the organic light emitting diode (OLED). It can have a tilt and directivity in the tilted direction.

When a structure with such light directivity is applied to the bending area (BA) of the display device 100, most of the light emitted from the organic light emitting diode (OLED) located in the bending area (BA) is directed toward the front of the display device 100. heading towards

Accordingly, when the viewer views an image from the front of the display device 100, the viewer hardly notices a difference in color and brightness between the image displayed in the non-bending area NBA and the image displayed in the bending area BA.

In the display device 100 according to embodiments of the present invention, the embossing portion 320 provided on the surface of the insulating layer 310 will be examined in detail as follows.

FIG. 8 is an enlarged view of area X in FIG. 5.

Referring to FIG. 8, the diameter D of the embossed portion 320 provided on the surface of the insulating layer 310 may be 1 to 10 ㎛. Here, the diameter D of the embossed part 320 is a straight line passing through the center of the embossed part 320, and may be the length of a line segment connecting two points on the boundary between the embossed part 320 and the connection part 330.

And, the inclination (A) of the inclined surface of the embossed portion 320 of the insulating layer 310 may be 3 to 15 degrees based on the horizontal direction.

Meanwhile, in Figure 8, the slope (A) of the inclined surface of the embossing part 320 is shown as the slope at one point of the inclined surface of the embossing part 320, but the slope (A) of the inclined surface is the slope of the embossing part 320. It can encompass the slope of all points that have a slope in . In other words, the inclination at all points of the inclined surface of the embossed portion 320 may range from 3 degrees to 15 degrees.

And, the height (H) of the embossed portion 320 of the insulating layer 310 may be 0.2 to 1.5 ㎛. Here, the height (H) of the embossed portion 320 of the insulating layer 310 is the vertical distance from the bottom of the embossed portion 320 (the portion having the maximum depth from the surface of the insulating layer 310) to the upper surface of the connecting portion 330. means distance.

The embossed portion 320 of the insulating layer 310 may have the shape conditions described above, and the first electrode 520, the light emitting layer 530, and the second electrode 550 disposed on the insulating layer 310. ) can maintain a constant thickness.

Here, the thickness of the first electrode 520, the light emitting layer 530, and the second electrode 550 refers to the shortest vertical distance from the lower surface to the upper surface of each component.

Specifically, the thickness T11 of the first electrode 520 based on the direction perpendicular to the inclined surface of the embossed part 320 in the area corresponding to the inclined surface of the embossed part 320 of the insulating layer 310, and the embossed A thickness T12 of the first electrode 520 in the area corresponding to the bottom of the portion 320, and a thickness T13 of the first electrode 520 in the area corresponding to the connection part 330 of the insulating layer 310. may be the same.

In addition, the thickness T21 of the light emitting layer 530 based on the direction perpendicular to the inclined surface of the embossed part 320 in the area corresponding to the inclined surface of the embossed part 320 of the insulating layer 310, and the embossed part 320 ) may be the same as the thickness T22 of the light-emitting layer 530 in the area corresponding to the bottom of the light-emitting layer 530 and the thickness T23 of the light-emitting layer 530 in the area corresponding to the connection portion 330 of the insulating layer 310.

In addition, the thickness T31 of the second electrode 550 based on the direction perpendicular to the inclined surface of the embossed part 320 in the area corresponding to the inclined surface of the embossed part 320 of the insulating layer 310, and the embossed part The thickness T32 of the second electrode 550 in the area corresponding to the bottom of 320 and the thickness T33 of the second electrode 550 in the area corresponding to the connection portion 330 of the insulating layer 310 are may be the same.

Meanwhile, when the thickness of the light-emitting layer 530 varies in the light-emitting area EA, the current density applied to the light-emitting layer 530 becomes highest in the area with the thinnest thickness.

In this case, the organic light-emitting diode (OLED) mainly emits light in the area where the light-emitting layer 530 has the thinnest thickness, and emits light in the remaining areas except for the area where the light-emitting layer 530 has the thinnest thickness. Compared to this, the luminous efficiency decreases.

That is, if there is a change in the thickness of the light-emitting layer 530 in the light-emitting area EA, the organic light-emitting diode (OLED) has non-uniform light-emitting efficiency.

However, in embodiments of the present invention, the thickness of the light-emitting layer 530 in the light-emitting area EA of the bending area BA is maintained constant for each region, so that the thickness is uniform throughout the light-emitting area EA of the bending area BA. It can have luminous efficiency.

Meanwhile, at least one of the first electrode 520, the light emitting layer 530, and the second electrode 550 has the diameter (D) of the embossed portion 320 of the insulating layer 310 and the slope (A) of the inclined surface of the concave portion. and a plurality of concave portions corresponding to at least one of the height (H) of the embossing portion 320.

Here, corresponding to the diameter (D) of the embossed part 320, the slope (A) of the inclined surface of the embossed part 320, and the height (H) of the embossed part 320 means that the diameter, slope, and height are the same or allowable. It may be a concept that includes the diameter, slope, and height of the level at which the difference occurs within the error range. Here, for example, the tolerance range may be approximately 2% to 3%.

Meanwhile, in FIGS. 5 to 8, the embossing portion 320 provided in the insulating layer 310 of the present invention or the embossing portion 620 provided in the light emitting layer 530 is shown in a configuration in which the embossing portion 620 provided in the light emitting layer 530 has a concave shape in cross-section. is not limited to this, and another example of the embossing portion 320 provided in the insulating layer 310 is shown in FIG. 9 .

9 is a cross-sectional view of one subpixel in a bending area of a display device according to still other embodiments of the present invention. In the description below, content (configuration, effects, etc.) that overlaps with the previously described embodiments may be omitted.

As shown in FIG. 9, the embossing portion 320 provided in the insulating layer 310 may have a convex shape in cross-section.

In Figure 9, an embossing portion 320 is provided on the surface of the insulating layer 310, and the first electrode 520, the light emitting layer 530, and the second electrode 550 correspond to the surface shape of the insulating layer 310. Although a configuration having a shape is shown, the present invention is not limited thereto.

For example, instead of providing the embossing portion 320 on the surface of the insulating layer 310, the embossing portion may be provided on the light emitting layer 530.

Through this, the light emitted from the organic light emitting diode (OLED) located in the bending area BA is directed toward the front of the display device 100, so that when the viewer views the image from the front of the display device 100, non-bending is achieved. The difference in color and luminance between the image in the area (NBA) and the image in the bending area (BA) can be hardly felt.

Meanwhile, in FIGS. 4 to 9, one subpixel in the bending area BA is provided with one embossing portion 320 on the surface of the insulating layer 310 in the light emitting area EA, or one subpixel is provided on the light emitting layer 530. The description has focused on the configuration provided with the embossing portion 620, but the present invention is not limited to this.

For example, as shown in FIGS. 10 to 12, one subpixel located in the bending area BA is provided with a plurality of embossed portions 320 on the surface of the insulating layer 310 in the light emitting area EA. It can be.

Hereinafter, with reference to FIGS. 10 to 12, one subpixel (SP) located in the bending area (BA) is provided with a plurality of embossed portions 320 on the surface of the insulating layer 310 in the light emitting area (EA). Review. In the description below, content (configuration, effects, etc.) that overlaps with the previously described embodiments may be omitted.

10 and 11 are plan views showing a partial area of one subpixel located in a bending area of a display device according to other embodiments of the present invention.

First, referring to FIG. 10 , a plurality of embossed portions 320 may be provided on the surface of the insulating layer 310 in the bending area BA. At this time, one embossing part 320 may be connected to another adjacent embossing part 320 through a connection part 330.

The embossed portion 320 provided on the surface of the insulating layer 310 may be arranged to be spaced apart from the other embossed portions 320 at a distance W1.

For example, in one subpixel SP, the spacing W1 between the plurality of embossing parts 320 provided on the surface of the insulating layer 310 may be constant.

Here, constant interval means the same interval or similar interval. The meaning of being the same or similar may be a concept that includes the interval at which the difference occurs within the tolerance range. Here, for example, the tolerance range may be approximately 2% to 3%.

In addition, the gap W1 between the embossing part 320 and another adjacent embossing part 320 may be the length from the center of the embossing part 320 to the center of the other embossing part 320 in a plan view.

Meanwhile, Figure 10 shows a configuration in which the gap W1 between the embossing part 320 and the other neighboring embossing part 320 is constant, but the present invention is not limited thereto, and as shown in Figure 11, one The embossing part 320 provided in the subpixel SP may be spaced apart from another neighboring embossing part 320 at a first gap W1 or a second gap W2 that is a different distance from each other.

Furthermore, in the present invention, a plurality of embossing parts 320 provided in one subpixel (SP) may be arranged at irregular intervals from each other.

Figure 12 is a cross-sectional view taken along line C-D of Figure 10.

Referring to FIG. 12 , a plurality of embossed portions 320 are provided on the surface of the insulating layer 310 in the light emitting area (EA) of the bending area (BA).

Additionally, at least one of the first electrode 520, the light emitting layer 530, and the second electrode 550 of the organic light emitting diode (OLED) is on the insulating layer 310 in the light emitting area EA. It has a form that corresponds to its shape.

When a plurality of embossing portions 320 are provided on the surface of the insulating layer 310 in the light emitting area (EA) of one subpixel (SP), for example, the number of embossing portions 320 is 2 to 20. It could be a dog. By providing 1 to 20 embossing portions 320 on the surface of the insulating layer 310, loss of light emitted from the organic light emitting diode can be prevented.

If there is no embossing portion 320 on the surface of the insulating layer 310, as described in FIG. 2, differences in color and luminance of the image may occur in the bending area BA depending on the viewing angle.

Also, when the number of embossed parts 320 on the surface of the insulating layer 310 exceeds 20, the density of the embossed parts 320 in the light emitting area EA of one subpixel SP increases.

In this case, the thickness of the light emitting layer 530 disposed on the insulating layer 310 may vary depending on the region. For example, in an area corresponding to the inclined surface of the embossed portion 320, the thickness in a direction perpendicular to the inclined surface may become thin. However, since a high current density is applied to a thin part of the light-emitting layer 530 and the organic light-emitting diode (OLED) mainly emits light, a luminance difference may occur in the light-emitting area EA.

However, in the display device 100 according to embodiments of the present invention, an organic light emitting diode (OLED) disposed on the insulating layer 310 is located on the surface of the insulating layer 310 in the light emitting area of one subpixel (SP). ) The embossing portion 320 may be provided to have a density such that the thickness does not change.

As described above, at least one embossing part 320 is provided on the surface of the insulating layer 310 in the light emitting area EA of the bending area BA, or at least one embossing part 620 is provided in the light emitting layer 530. may be provided, but the surfaces of the insulating layer 310 and the light emitting layer 520 may be flat in the non-bending area (NBA) and the light emitting area (EA).

When examining this with reference to FIGS. 13 and 14, it is as follows. In the description below, content (configuration, effects, etc.) that overlaps with the previously described embodiments may be omitted.

FIG. 13 is a plan view showing a partial area of one subpixel located in a non-bending area of a display device according to embodiments of the present invention, and FIG. 14 is a cross-sectional view taken along E-F of FIG. 13.

Referring to FIGS. 13 and 14 , the surface of the insulating layer 310 may be flat, unlike the surface of the insulating layer 310 in FIGS. 4 , 10 , and 11 . That is, the embossing portion 320 may not be provided on the surface of the insulating layer 310 in the non-bending area NBA.

Meanwhile, since most of the light emitted from the organic light emitting diode in the non-bending area (NBA) of the display device 100 is emitted in the front direction of the display device 100, the viewer may view the display device (NBA) corresponding to the non-bending area (NBA). 100), you can view images with high visibility.

Therefore, when the embossing portion 320 is provided on the surface of the insulating layer 310 in the non-bending area (NBA), the image may appear differently depending on the viewing angle.

Next, with reference to FIGS. 15 to 17 , display devices according to other embodiments of the present invention will be reviewed as follows. In the description below, content (configuration, effects, etc.) that overlaps with the previously described embodiments may be omitted.

Figure 15 is a schematic plan view of a display device according to other embodiments of the present invention.

Referring to FIG. 15 , a display device 100 according to other embodiments of the present invention includes an insulating layer 310 disposed on a display panel substrate. The insulating layer 310 may be disposed in the non-bending area (NBA) and the bending area (BA) located on both sides of the non-bending area (NBA).

A plurality of subpixels are located in each of the non-bending area NBA and the bending area BA, and each subpixel may include at least one light-emitting area EA1 and EA2.

Additionally, at least one embossing portion 320 may be provided on the surface of the insulating layer 310 in the light emitting area.

Meanwhile, the plurality of light-emitting areas disposed in the bending area BA may include a first light-emitting area EA1 and a second light-emitting area EA2. Here, the first light-emitting area EA1 is an arbitrary light-emitting area located farther from the non-bending area NBA than the second light-emitting area EA2. Specifically, the distance between the first light-emitting area EA1 and the non-bending area NBA, which is an area other than the bending area, may be greater than the distance between the second light-emitting area EA2 and the non-bending area NBA.

The number of embossed portions 320 of the insulating layer 310 in the first emitting area EA1 may be greater than the number of embossed portions 320 of the insulating layer 320 in the second emitting area EA2.

For example, assuming that the first light-emitting area EA1 and the second light-emitting area EA2 have the same area, as shown in FIG. 15, the surface of the insulating layer 310 in the first light-emitting area EA1 While three embossing parts 320 are provided, two embossing parts 320 may be provided on the surface of the insulating layer 310 in the second light emitting area EA2.

Meanwhile, when the display device 100 of the present invention is in a bent state as shown in FIG. 2, the curvature of the bending area BA may become smaller as it is located further away from the non-bending area NBA.

This means that the degree of bending (degree of bending) of the bending area (BA) increases as the distance from the non-bending area (NBA) increases.

Therefore, as the bending area (BA) moves away from the non-bending area (NBA), most of the light emitted from the organic light emitting diode exits toward the side of the display device 100 rather than the front, so that the display device corresponding to the bending area (BA) (100) Visibility from the side may be reduced. This reduction in visibility may mean that the quality of the image shown to the user from the side corresponding to the bending area (BA) is deteriorated.

However, in the display device 100 of the present invention, the number of embossing portions 320 provided on the surface of the insulating layer 310 per certain area is varied according to the change in curvature of the bending area (BA). The side visibility of the display device 100 corresponding to can be improved.

In addition, when the bending curvature in the first light-emitting area EA1 disposed in the bending area BA is smaller than the bending curvature in the second light-emitting area EA2, the insulating layer located in the first light-emitting area EA1 The spacing W3 and W4 of the embossed portions 320 in 310 may be smaller than the spacing W5 of the embossed portions 320 of the insulating layer 310 in the second light emitting area EA2.

That is, the farther the bending area (BA) is from the non-bending area (NBA), the higher the density of the embossing parts 320 provided on the surface of the insulating layer 310 per certain area, and the higher the density of the embossing parts 320 arranged. ), the directivity of light emitted from the organic light emitting diode can be changed to the front of the display device 100.

Meanwhile, in Figure 15, the arrangement characteristics of the embossed part 320 of the insulating layer 310 were examined throughout the bending area BA, but in Figures 16 and 17, the embossing of the insulating layer 320 within one subpixel was examined. Review the arrangement characteristics of unit 320.

FIG. 16 is a plan view showing an arbitrary subpixel located in a bending area of the display device of FIG. 15. Figure 17 is a cross-sectional view taken along line E-F of Figure 16.

16 and 17, the spacing between the plurality of embossing parts 320 provided on the surface of the insulating layer 310 within one subpixel (SP) located in the bending area (BA) increases as the distance from the non-bending area (NBA) increases. It shows a narrowing tendency.

Specifically, at least two of the intervals W6, W7, and W8 of the plurality of embossing parts 320 provided in one subpixel SP may be different from each other.

In this way, even within one subpixel located in the bending area (BA), the spacing (W6, W7, W8) of the embossing portions 320 becomes narrower as it moves away from the non-bending area (NBA), ), the density of the embossed portion 320 can be increased as it moves away from it.

Accordingly, the farther the bending area (BA) is from the non-bending area (NBA), the greater the degree of changing the directivity of light to the front direction, and ultimately, the side view of the display device 100 corresponding to the bending area (BA) can be increased. can be improved.

According to the above-described embodiments of the present invention, an organic light emitting display device having a structure that can improve the visibility of an image displayed in a bending area when a viewer views a bendable display device from the front can be provided.

According to embodiments of the present invention, an organic light emitting display device having a structure that can reduce the difference in visual perception between images displayed in a bending area and a non-bending area can be provided.

The above description and attached drawings are merely illustrative of the technical idea of the present invention, and those skilled in the art will be able to combine the components without departing from the essential characteristics of the present invention. , various modifications and transformations such as separation, substitution, and change will be possible. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100: display panel
310: insulating layer
320: embossing part
520: first electrode
530: light emitting layer
550: second electrode

Claims (18)

An organic light emitting display device comprising at least one bending area capable of bending and at least one non-bending area other than the bending area,
an insulating layer disposed on a substrate; and
It is disposed on the insulating layer and includes an organic light emitting diode including a first electrode, a light emitting layer, and a second electrode,
The thickness of the light emitting layer disposed on the insulating layer is different for each region within the bending region,
In the bending area, the surfaces of the insulating layer and the light-emitting layer are non-flat, and in the non-bending area, the surfaces of the insulating layer and the light-emitting layer are flat.
In the light emitting area located in the bending area and emitting light from each subpixel area provided on the substrate,
The insulating layer has at least one embossed portion whose surface shape is in the form of an embossing,
The light-emitting area disposed in the bending area includes a first light-emitting area and a second light-emitting area,
The distance of the first light-emitting area from the non-bending area is greater than the distance of the second light-emitting area from the non-bending area,
The number of embossed portions in the insulating layer in the first light-emitting area is,
An organic light emitting display device in which the number of embossed portions of the insulating layer is greater than the number of embossed portions of the insulating layer in the second light emitting area.
According to clause 1,
An organic light emitting display device in which the thickness of the light emitting layer is different within one subpixel.
According to clause 1,
An organic light emitting display device wherein the light emitting layer disposed in the bending area and the light emitting layer disposed in the non-bending area have different thicknesses.
delete According to clause 1,
An organic light emitting display device wherein at least one of the first electrode, the light emitting layer, and the second electrode has a shape corresponding to an embossed portion of the insulating layer.
According to paragraph 1,
The organic light emitting display device wherein the at least one embossing part is one of a concave part and a convex part.
According to paragraph 1,
The insulating layer further includes a connecting portion connecting the embossing portion to another adjacent embossing portion.
In clause 7,
An organic light emitting display device wherein the connection portion has a flat shape.
delete According to paragraph 1,
The plurality of light-emitting areas disposed in the bending area include a first light-emitting area and a second light-emitting area,
The bending curvature in the first light-emitting area is smaller than the bending curvature in the second light-emitting area,
The spacing of the embossing portion in the insulating layer in the first light-emitting area is,
An organic light emitting display device that is smaller than a gap between the second light emitting area and the embossing portion of the insulating layer.
According to paragraph 1,
At least one of the first electrode, the light emitting layer, and the second electrode,
An organic light emitting display device comprising an embossing part corresponding to at least one of a diameter of the embossing part, a slope of an inclined surface of the embossing part, and a height of the embossing part.
According to clause 11,
In the area corresponding to the embossed portion of the insulating layer,
The thickness of the first electrode based on the direction perpendicular to the inclined surface of the embossing part,
The thickness of the first electrode in the area corresponding to the bottom of the embossing part,
An organic light emitting display device wherein the thickness of the first electrode is the same in a region corresponding to the connecting portion of the insulating layer.
According to clause 11,
In the area corresponding to the embossed portion of the insulating layer,
The thickness of the light emitting layer based on the direction perpendicular to the inclined surface of the embossing part,
The thickness of the light emitting layer in the area corresponding to the bottom of the embossing part,
An organic light emitting display device in which the thickness of the light emitting layer is different in a region corresponding to the connecting portion of the insulating layer.
According to clause 11,
In the area corresponding to the embossed portion of the insulating layer,
The thickness of the second electrode based on the direction perpendicular to the inclined surface of the embossing part,
The thickness of the second electrode in the area corresponding to the bottom of the embossing part,
An organic light emitting display device wherein the thickness of the second electrode is the same in a region corresponding to the connecting portion of the insulating layer.
According to paragraph 1,
In one subpixel area,
The insulating layer is provided with a plurality of embossing parts,
An organic light emitting display device in which the plurality of embossing parts are arranged at irregular intervals.
According to paragraph 1,
The organic light emitting display device includes at least one non-bending area,
In the light emitting area of the non-bending area,
An organic light emitting display device wherein the insulating layer, the first electrode, the light emitting layer, and the second electrode have flat surfaces.
An organic light emitting display device comprising at least one bending area capable of bending and at least one non-bending area other than the bending area,
an insulating layer disposed on a substrate; and
It is disposed on the insulating layer and includes an organic light emitting diode including a first electrode, a light emitting layer, and a second electrode,
The thickness of the light emitting layer disposed on the insulating layer is different for each region within one subpixel,
In the light emitting area located in the bending area and emitting light from each subpixel area provided on the substrate,
The light emitting layer has at least one embossing portion,
In the light-emitting area located in the non-bending area, the light-emitting layer does not have an embossing portion,
The light-emitting area disposed in the bending area includes a first light-emitting area and a second light-emitting area,
The distance of the first light-emitting area from the non-bending area is greater than the distance of the second light-emitting area from the non-bending area,
The number of embossed portions in the insulating layer in the first light-emitting area is,
An organic light emitting display device in which the number of embossed portions of the insulating layer is greater than the number of embossed portions of the insulating layer in the second light emitting area.
According to clause 17,
The second electrode is,
An organic light emitting display device having a shape corresponding to an embossed portion of the light emitting layer in the light emitting area of the bending area.