KR102653279B1 - Organic light emitting display device - Google Patents

Abstract

The organic electroluminescent display device according to the present invention includes a first electrode, a bank overlapping the edge of the first electrode, a light emitting area defined by the bank, an organic light emitting layer located on the first electrode and the bank, a second electrode, and a second electrode. It includes a cementation layer positioned on the cementation layer, a black matrix positioned on the cementation layer, and an opening area defined by the black matrix, the area of the opening area is larger than the area of the light emitting area, and the center of the opening area is (0,0). In the virtual X-Y plane, the planar shape of the aperture area is symmetrical with respect to the X and Y axes of the virtual

Description

Organic electroluminescent display device {ORGANIC LIGHT EMITTING DISPLAY DEVICE}

The present invention relates to an organic electroluminescent display device, which has excellent visibility and at the same time has excellent luminance depending on the viewing angle.

Recently, various flat panel display devices that can reduce the weight and volume, which are disadvantages of cathode ray tubes, are being developed. Such flat panel displays include liquid crystal displays, field emission displays, plasma displays, and organic electroluminescence displays.

Among these flat panel displays, plasma displays are attracting attention as the most advantageous display devices for large screens due to their simple structure and manufacturing process, but they have the disadvantage of low luminous efficiency and brightness and high power consumption. In comparison, the liquid crystal display device has the disadvantage of making it difficult to create a large screen because it uses a semiconductor process and consumes a lot of power due to the use of a backlight unit. In addition, liquid crystal displays have the characteristics of high light loss and narrow viewing angles due to optical members such as polarizing filters, prism sheets, and diffusion plates.

In comparison, electroluminescent display devices are self-luminous devices that emit light on their own, and have the advantages of fast response speed, lightweight and thin manufacturing, and high luminous efficiency, brightness, and viewing angle. Depending on the material of the light emitting layer, they are roughly divided into inorganic electroluminescence display devices and organic electroluminescence display devices. Inorganic electroluminescence displays consume more power than organic electroluminescence displays, cannot achieve high brightness, and cannot emit various colors such as R (Red), G (Green), and B (Blue). On the other hand, organic electroluminescent displays are currently being actively researched because they are driven at low direct current voltages of tens of volts, have a fast response speed, can achieve high brightness, and can emit various colors of R, G, and B. .

Due to the various advantages described above, organic electroluminescent displays are attracting attention as next-generation displays, but securing a wider viewing angle by reducing the cell gap through thinning has faced technical limitations.

The problem to be solved according to an embodiment of the present invention is to provide an organic electroluminescent display device with increased luminance according to the viewing angle by designing the planar area of the aperture area to be larger than the planar area of the light emitting area.

In addition, another problem to be solved according to an embodiment of the present invention is to provide an organic light emitting display device that increases luminance according to the viewing angle and consequently has an increased maximum one-side viewing angle, that is, a wider viewing angle.

In addition, another problem to be solved according to an embodiment of the present invention is to design the planar area of the aperture area to be larger than the planar area of the light emitting area, especially so that the width from the edge of the light emitting area to the edge of the aperture area is not constant. By doing so, an organic electroluminescent display device with increased visibility is provided by effectively covering metal electrodes and wiring with high light reflectance.

In order to achieve the above object, an organic electroluminescent display device according to the present invention includes a first electrode, a bank overlapping the edge of the first electrode, a light emitting area defined by the bank, and an organic light emitting layer located on the first electrode and the bank. and a second electrode, a cementation layer positioned on the second electrode, a black matrix positioned on the cementation layer, and an opening area defined by the black matrix, wherein the area of the opening area is larger than the area of the light emitting area, and the opening area is In the virtual X-Y plane with the center at (0,0), the planar shape of the aperture area is symmetrical about the X and Y axes of the virtual can be different.

At this time, in the organic electroluminescent display device according to the present invention, the planar shape of the opening area and the planar shape of the light emitting area may not be congruent or similar to each other.

At this time, the organic electroluminescent display device according to the present invention further includes a color filter on the adhesive layer, the distance between the first electrode and the color filter is set to H, and the distance from the edge of the arbitrary light emitting area to the edge of the opening area is set to H. When the width to the point is W, among the edge points of the light emitting area, there is an edge point of the light emitting area that has the maximum value of Θ of a virtual right triangle where H and W1 are at right angles, and that point The value of Θ may be arcsin(1/1.8) or less.

At this time, the organic electroluminescence display device according to the present invention sets the edge point of a random light-emitting area, sets the edge point of the opening area corresponding to the edge point of the random light-emitting area, and sets the edge point of the random light-emitting area. When the width from to the edge point of the opening area corresponding to the edge point of the arbitrary light-emitting area is W1, the value of W1 may be different for each edge point of the arbitrary light-emitting area.

At this time, in the organic electroluminescent display device according to the present invention, W1 of a portion of the opening area may be wider than W1 of the remaining area of the opening area.

At this time, in the organic electroluminescent display device according to the present invention, a partial area of the opening area may be an edge area of the opening area that is closer to the center of the opening area than the remaining area of the opening area.

At this time, the organic electroluminescent display device according to the present invention may have a shape in which W1 gradually narrows from the center of the opening area to both sides of the opening area.

At this time, in the organic electroluminescent display device according to the present invention, when the width of the black matrix located on the same straight line as W1 is W2, the point where W1 has the maximum value may be the point where W2 has the minimum value.

At this time, the organic light emitting display device according to the present invention has the same Y coordinate on the virtual X-Y plane, and the two W1 located on different sides of the X axis may have the same width.

At this time, the width of the organic electroluminescent display device according to the present invention from the edge of the light emitting area to the edge of the opening area may not be constant.

At this time, in the organic electroluminescent display device according to the present invention, depending on the position of the edge point of any light emitting area, there is a deviation in W1 corresponding to that point, and the deviation is symmetrical about the X or Y axis of the X-Y plane. It can be.

At this time, in the organic electroluminescent display device according to the present invention, the planar shape of the opening area is one of the following: a polygonal shape, a cross-sectional shape of a dumbbell, a cross-sectional shape of an hourglass, a cross-sectional shape of a rolling pin, or a cross-sectional shape of a sausage. You can.

The organic electroluminescent display device according to an embodiment of the present invention is designed to have a planar area of the aperture area larger than the planar area of the light emitting area, thereby providing an organic electroluminescent display device with increased luminance according to the viewing angle.

In addition, the organic light emitting display device according to an embodiment of the present invention increases luminance according to the viewing angle, and as a result, it is possible to provide an organic light emitting display device with an increased maximum one-sided viewing angle, that is, a wider viewing angle.

In addition, the organic electroluminescent display device according to an embodiment of the present invention is designed so that the planar area of the opening area is larger than the planar area of the light emitting area, and in particular, the width from the edge of the light emitting area to the edge of the opening area is not constant. By designing the organic light emitting display device to have increased visibility by effectively covering metal electrodes and wiring with high light reflectance, it is possible to provide an organic electroluminescent display device with increased visibility.

Figure 1 is a graph showing the results of simulating the maximum one-sided viewing angle according to the cell gap according to the width of the black matrix between two adjacent subpixels.
Figure 2 is a cross-sectional view of an organic light emitting display device according to an embodiment of the present invention.
Figure 3 is a plan view of one pixel, which is composed of a total of three RGB sub-pixels in a stripe structure.
4 and 5 are plan views of various pixels that may be included in an organic light emitting display device according to an embodiment of the present invention.
Figure 6 is a plan view of one pixel, which is composed of a total of three RGB sub-pixels of a typical stripe structure in which both the planar shape of the light emitting area and the planar shape of the aperture area are stripes.
Figure 7 is a graph showing external light reflectance according to the wavelength of reflected external light in Examples and Comparative Examples.
Figure 8 is a graph showing the wavelength average luminance according to the viewing angle of Examples and Comparative Examples.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete, and those skilled in the art It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown.

Like reference numerals refer to like elements throughout this specification.

In describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used.

In this specification, when an element is expressed in the singular, the plural element is included unless specifically stated otherwise.

In interpreting the components in this specification, they are interpreted to include the margin of error even if there is no separate explicit description.

In the case of description of the positional relationship in this specification, for example, when the positional relationship between two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., Unless 'immediately' or 'directly' or 'adjacently' are used together, one or more other parts may be located between the two parts.

In this specification, when an element or layer is referred to as “on” another element or layer, it includes all cases where another layer or other element is interposed or directly on top of another element.

Although first, second, etc. are used in this specification to describe various elements, these elements are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

In describing the components of the present invention in this specification, 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.

Like reference numerals refer to like elements throughout this specification.

In this specification, the area of a certain layer means the area of the largest surface of the upper or lower surface of a certain layer.

In this specification, the expression "identical" or "symmetrical" has the meaning of including cases where the material is substantially identical or substantially symmetrical.

The size and thickness of each component shown in the drawings of this specification are shown for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the components shown.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, and as can be fully understood by those skilled in the art, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other or may be related to each other. It may be possible to implement them together.

In the drawings of this specification, the plan or cross-section of various layers that are components of the organic light emitting display device according to the present invention are represented as squares for convenience. Accordingly, the various layers appear to have a clear distinction between the front and the sides, but in reality, the front and sides may not be clearly distinguished, and may have a gently curved shape.

Hereinafter, an organic light emitting display device according to various embodiments of the present invention will be described in detail with reference to the attached drawings.

The inventors of the present invention simulated the maximum one-sided viewing angle according to the cell gap in a top-emitting white organic light emitting display device according to the width of the black matrix between two adjacent sub-pixels. Figure 1 is a graph showing the results.

Looking at Figure 1, it can be seen that as the width of the black matrix between two adjacent subpixels becomes narrower, the maximum one-side viewing angle increases. In addition, it can be seen that the smaller the cell gap of the top-emitting white organic light emitting display device, the greater the maximum one-sided viewing angle. For example, when the cell gap is about 9 micrometers, it can be seen that the width of the black matrix must be about 11.7 micrometers or less in order to achieve a maximum one-sided viewing angle of 90 degrees or more.

Further increasing the maximum one-sided viewing angle, that is, securing a wider viewing angle, is a performance improvement task that is absolutely necessary for display devices. In particular, in order to implement large-screen display devices such as TVs or commercial displays, the task of improving performance must be solved. From Figure 1, it can be seen that in order to solve this performance improvement problem, the cell gap must be reduced or the width of the black matrix between two adjacent subpixels must be reduced.

However, reducing the cell gap is currently not easy as it requires the use of color filters. In the case of a white organic light emitting display device, the color of each sub-pixel is individually implemented using a color filter. In particular, in the case of a top-emitting white organic light emitting display device, the substrate on which the color filter is disposed must be bonded to the substrate on which the organic light emitting element is disposed. At this time, it is currently difficult to reduce the cell gap because there are physical limits to reducing the thickness of the resin used for cementation.

Meanwhile, a method of reducing the width of the black matrix between two adjacent subpixels can be considered. Originally, black matrices were used to prevent light reflection by covering metal electrodes and wiring with high light reflectance placed under organic light-emitting devices. However, if you recklessly reduce the width of the black matrix, the area of the black matrix will inevitably decrease. If the area of the black matrix is reduced, light reflection becomes less effective, and visibility due to external light reflection is inevitably reduced. Therefore, it is not possible to simply apply the method of reducing the width of the black matrix.

Accordingly, the inventors of the present invention studied a method to increase the maximum one-sided viewing angle while preventing the area of the black matrix from being reduced. Rather than simply reducing the width of the black matrix between adjacent sub-pixels, the maximum one-sided viewing angle is increased by optimizing the relationship between the shape of the black matrix and the light-emitting area divided by the bank in the organic light-emitting device that generates and emits light. While doing so, it was possible to keep the area of the black matrix from decreasing.

In the following, we will look at the relationship between the light emitting area divided by the bank and the shape of the black matrix in more detail.

Figure 2 is a cross-sectional view of an organic light emitting display device 200 according to an embodiment of the present invention. The organic electroluminescent display device 200 according to an embodiment of the present invention has a TFT driving element layer (not shown) for driving an organic light emitting element located on a first substrate (not shown), and a TFT driving element layer (not shown). ) A planarization layer 210 for planarizing the TFT driving element layer (not shown) is located on the planarization layer 210, and the first electrode 220 is located in an island shape corresponding to each sub-pixel, A bank 230 that has a shape that overlaps the edge of the first electrode 220 and is located over the edge of the first electrode 220 and the planarization layer 210, on the bank 230 and the first electrode 220. The organic light-emitting layer and the second electrode 240 positioned sequentially, the cementation layer 250 positioned on the organic light-emitting layer and the second electrode 240, and the black matrix 260 and color filter positioned on the cementation layer 250. 270 , a black matrix 260 , and a second substrate 280 located on the color filter 270 . At this time, the black matrix 260 may overlap the edge of the color filter 270.

The bank 230 overlaps the edge of the first electrode 220, which is independent for each subpixel. As a result, the area where the organic light emitting layer and the second electrode layer 240 overlap with the first electrode 220 is defined. In other words, the bank 230 partitions the area of the organic light emitting device, that is, the light emitting area 230a.

The black matrix 260 overlaps the edge of the color filter 270. Light generated from the organic light emitting device is emitted to the outside through each color filter 270 corresponding to each sub-pixel 290. At this time, only light of a specific color is emitted to the outside by the color filter 270. The black matrix 260 prevents the phenomenon in which light generated from the organic light-emitting device of a sub-pixel 290 leaks out and is emitted to the outside through the color filter 270 corresponding to the adjacent sub-pixel 290 (i.e., light leakage phenomenon). To prevent this, it is positioned overlapping the edge of the color filter 270.

Additionally, the black matrix 260 is located along the pattern of the bank 230. This is especially true when the bank 230 is made of a material that has a low light absorption or light reflection effect or when the bank 230 is transparent. Various driving-related metal wirings are located below the organic light emitting device. At this time, when external light enters the display device, the metal wires reflect the external light. Alternatively, in the top emission method, the first electrode 220 of the organic light emitting device may further include a reflective electrode (not shown). At this time, when external light enters the display device, the reflective electrode also reflects the external light. To prevent visibility from being reduced due to reflection of external light by such metal wires or metal electrodes, the black matrix 260 is positioned to cover metal wires and electrodes other than the light emitting area 230a.

An area through which light can be emitted is defined by the black matrix 260, which is called an aperture area 260a.

Referring to Figure 2, the width of the opening area 260a is wider than the width of the light emitting area 230a. Since FIG. 2 is a cross-sectional view, only the width of the opening area 260a and the width of the light emitting area 230a are shown, but the area of the opening area 260a is larger than the area of the light emitting area 230a. As a result, when the light generated from the organic light emitting device is emitted through the color filter 270, a wider viewing angle can be secured.

Looking more specifically, light has omnidirectional properties. In other words, the light generated from the organic light emitting device spreads in all directions. When the adhesive layer 250, the color filter 270, and the plastic-based second substrate 280 are made of an organic material, their refractive index n has a value of about 1.8. In particular, the second substrate 280 may be made of a plastic-based polymer material such as polyimide to ensure flexibility of the display device.

In this case, let's assume that light starts from the edge of the light emitting area 230a and is emitted to the outside of the display device, as shown by the arrow. Light is refracted due to a difference in refractive index between the second substrate 280 and the air layer. By utilizing this refractive property of light, it is possible to secure the maximum one-sided viewing angle.

If expressed as a formula according to Snell's law, it is as follows.

sin(Θ2)=1.8*sin(Θ1)

At this time, Θ1 is the maximum value of the incident angle of light at the interface between the second substrate 280 and the air layer. Only the light that passes through the opening area 260a can be refracted at an incident angle at the interface between the second substrate 280 and the air layer. It is natural that the angle of incidence for light caught in the black matrix 260 and not passing through the opening area 260a cannot be assumed at the interface between the second substrate 280 and the air layer.

Θ1 is formed by the cell gap (H) and the distance (W) from the edge point of the light emitting area 230a to the edge point of the opening area 260a. Cell gap (H) refers to the distance between the first electrode and the color filter. For convenience in explaining Figure 2, the cell gap (H) is referred to as H, and the distance (W) from the edge point of the light emitting area 230a to the edge point of the opening area 260a is referred to as W. It is said that

More specifically, Θ1 is one angle in an imaginary right triangle where H and W form right angles, as shown in FIG. 2.

Additionally, Θ2 is the maximum value of the refraction angle of light incident at Θ1 at the interface between the second substrate 280 and the air layer. The light does not undergo total internal reflection, but passes through the interface between the second substrate 280 and the air layer, is refracted, and is emitted to the outside. The maximum value of this is Θ2, and Θ2 becomes the maximum one-sided viewing angle.

In any subpixel 290 included in the organic light emitting display device 200 according to an embodiment of the present invention, the cell gap (H) will have the same value in all areas, but W is the same in the light emitting area (230a). ), the value may vary depending on the location of the edge point. Accordingly, the Θ1 value may also vary depending on the location of the edge point of the light emitting area 230a. Therefore, in any arbitrary sub-pixel 290, there is always an edge point of the light-emitting area 230a where Θ1 is the minimum value, and there is an edge point of the light-emitting area 230a where Θ1 is the maximum value. Since H has the same value in all areas of any random sub-pixel 230, there is an edge point of the light-emitting area 230a where W is the maximum value in any random sub-pixel 290, and W is the minimum value. There is an edge point of the phosphorus emission area 230a. At this time, in any subpixel 290, the edge point of the light emitting area 230a where Θ1 is the maximum value and the edge point of the light emitting area 230a where W is the minimum value are the same.

In order to secure a better viewing angle, the inventors of the present invention set the maximum value of Θ2 to be 90° in any sub-pixel 290, that is, the edge point of the light emitting area 230a where Θ2 is 90° is located at the sub-pixel ( The sub-pixel 230 was designed to exist in 230). By doing so, it is possible to secure the maximum one-side viewing angle of the sub-pixel 230 as much as possible.

Θ1 when Θ2 is 90° is the value when the incident angle of light has the critical angle of total internal reflection and has the following value.

Θ1 = arcsin(1/1.8)

When the Θ1 value becomes arcsin(1/1.8), the maximum one-sided viewing angle (Θ2) can be secured to 90°, that is, the maximum.

That is, the inventors of the present invention designed the sub-pixel 230 so that the edge point of the light-emitting area 230a, where Θ2 is 90°, exists in the sub-pixel 230. To achieve this, Θ1 is arcsin(1). The sub-pixel 230 was designed so that the edge point of the light-emitting area 230a (/1.8) exists in the sub-pixel 230. The closer the edge point of the light emitting area 230a, where Θ1 is arcsin(1/1.8), is located at the center of the subpixel 230, the more advantageous it is in terms of securing a viewing angle.

If Θ1 becomes greater than arcsin (1/1.8), it enters the interface between the second substrate 280 and the air layer toward an area other than the opening area 260a and is absorbed when it encounters the black matrix 260, resulting in This leads to light loss. Therefore, it is desirable that the maximum value of Θ1 is equal to or smaller than arcsin(1/1.8).

That is, among the edge points of the light-emitting area 230a in any sub-pixel 290, the light-emitting area 230a has the maximum value of Θ1 of a virtual right triangle where H and W1 are at right angles. ), there is an edge point, and the value of Θ1 at that point is preferably arcsin(1/1.8) or less.

In the following, in any sub-pixel 290 included in the organic light emitting display device 200 according to an embodiment of the present invention, W has a certain value depending on the position of the edge point of the light emitting area 230a. Let's take a look and see if it's possible.

FIG. 3 is a plan view of an arbitrary exemplary pixel 300 included in an organic light emitting display device according to an embodiment of the present invention. More specifically, FIG. 3 is a plan view of one pixel 300 comprised of a total of three RGB sub-pixels 350 in a stripe structure included in an organic light emitting display device according to an embodiment of the present invention. The pixel 300, which is composed of a total of three RGB sub-pixels 350 in a stripe structure, is only an exemplary pixel structure included in the organic light emitting display device according to an embodiment of the present invention, and is not necessarily limited to this shape. .

In the plan view of FIG. 3, the planar structure of the bank 230, the light emitting area 230a, the black matrix 260, and the opening area 260a of FIG. 2 are shown. Looking more specifically, any arbitrary sub-pixel 350 has an island-shaped light-emitting area 310, a bank 320 that closedly partitions the light-emitting area 310, and a bank (not shown) with a bonding layer (not shown) in between. It is located overlapping with 320 and includes a black matrix 340 that closedly partitions the opening area 330.

At this time, the area of the opening area 330 is larger than the area of the light emitting area 310. However, the planar shape of the opening area 330 and the planar shape of the light emitting area 310 are not similar but different from each other. For example, the planar shape of the opening area 330 and the planar shape of the light emitting area 310 may not be congruent or similar to each other.

At this time, if the alignment is designed and manufactured to overlap as much as possible and the planar shape of the light emitting area 310 is included within the planar shape of the opening area 330, a better viewing angle can be secured. .

In other words, in the relationship between the opening area 330 and the light-emitting area 310, the area of the opening area 330 is larger than the area of the light-emitting area 310, and the light-emitting area ( 310) is preferably included.

In the relationship between the opening area 330 and the light emitting area 310, a virtual X-Y plane with the center of the opening area 330 at (0,0) can be assumed as shown in the drawing.

At this time, if the edge point of any arbitrary light emitting area 310 is set, the edge point of the opening area 330 corresponding thereto is determined. Here, 'corresponding thereto' means that when the edge point of any arbitrary light-emitting area 310 is set, from the edge point of any arbitrary light-emitting area, the This means that the edge point of the opening area 330 is determined.

At this time, in one sub-pixel 350 (350), an aperture has the same The width W1 up to the edge of the area 330 can be assumed.

For convenience in explaining FIG. 3, in one sub-pixel 350, from an edge point of an arbitrary light-emitting area 310, an , the width (W1) to the edge of the opening area 330 is referred to as W1 according to the drawing symbol. W1 is included in the virtual X-Y plane.

The value of W1 varies depending on which point the edge point of the arbitrary light emitting area 310 is set. In other words, W1 is not constant and has a deviation depending on which point the edge point of the arbitrary light emitting area 310 is set.

Additionally, when an edge point of any arbitrary light emitting area 310 is set, the width (W2) of the black matrix located on the same straight line as W1 can be assumed. At this time, the width (W2) of the black matrix means the width between the two most adjacent opening areas 330. For convenience in explaining FIG. 3, when an edge point of any arbitrary light emitting area 310 is set, the width (W2) of the black matrix located on the same straight line as W1 is referred to as W2.

W1 becomes wider as it moves from both sides of the opening area 330 to the center of the opening area 330. As W1 becomes wider, the corresponding W2 becomes narrower. For example, the edge point of any light emitting area 310 where W1 is widest and W2 is narrowest is closer to the center of the aperture area 330 than the edge point of any other light emitting area 310.

In this way, in the entire light-emitting area 310 of any sub-pixel 350, W1 can be designed to be narrow or wide depending on the position of the edge point of the arbitrary light-emitting area 310.

W1 of a partial area of the opening area 330 is designed to be wider than W1 of the remaining area of the opening area 330 in relation to the light emitting area 310. For example, some areas of the opening area 330 may be edge areas of the opening area 430a that are closer to the center of the opening area 330 than the remaining areas of the opening area 330. As a result, some areas of the opening area 330 can be configured for purposes that can maximize the maximum one-sided viewing angle as seen in FIG. 2.

At the same time, the remaining area of the opening area 330 is designed to have W1 narrow in its relationship with the light emitting area 310. For example, the remaining area of the opening area 330 may be an edge area of the opening area 330 that is farther from the center of the opening area 330 than a partial area of the opening area 330. By making the width of the black matrix somewhat thicker without indiscriminately reducing W2 in the remaining area of the opening area 330, the remaining area of the opening area 330 is protected from external light reflection and light leakage caused by the lower metal wire or metal electrode. It can be configured to reduce.

At this time, W1 may be the widest shape at the center of the opening area 330. When W1 is at its maximum value, W1 may gradually become narrower from the center of the opening area 330 to both sides of the opening area 330. In other words, as the edge area of the opening area 330 is closer to the center of the opening area 330, the width of W1 corresponding thereto may gradually become wider.

In this way, when there is a deviation in W1 corresponding to the point according to the position of the edge point of the arbitrary light emitting area 310, the deviation can be symmetrical with respect to the virtual X-Y plane. For example, W1 may have the same width as another W1 located in a symmetrical position about the X-axis or Y-axis of the virtual X-Y plane. Looking at this in more detail, it is as follows.

You can set an edge point of an arbitrary light emitting area 310 with coordinates (x1, y1). And from this, the edge point of the opening area 330 having the coordinates (x2, y1), which has the same Y coordinate as the coordinates (x1, y1) and is located on the same side of the X axis, is determined. At this time, W1 is the distance from coordinates (x1, y1) to coordinates (x2, y1), and will be named W1_x1x2. Meanwhile, it is possible to set an edge point of an arbitrary light emitting area 310 with coordinates (x3, y1), which has the same Y coordinate as coordinates (x1, y1) and is located on the opposite side based on the X axis. In this case, for example, the coordinates (x1, y1) may be symmetrical to the coordinates (x3, y1) and the x-axis. From this, the edge point of the opening area 330 having the coordinates (x4, y1), which has the same Y coordinate as the coordinate (x3, y1) and is located on the same side of the X axis, is determined. At this time, W1 is the distance from coordinates (x3, y1) to coordinates (x4, y1), and will be named W1_x3x4. W1_x1x2 and W2_x3x4 may have the same width.

That is, two W1's that have the same Y coordinate on the virtual X-Y plane and are located on different sides of the X-axis can be symmetrical to each other. Alternatively, two W1s that have the same Y coordinate on the virtual X-Y plane and are located on different sides of the X-axis may have the same width.

Alternatively, the planar shape of the opening area 330 may be symmetrical with respect to the X and Y axes of the virtual X-Y plane.

As a result, in terms of securing the maximum one-side viewing angle, it is possible to uniformly secure the maximum one-side viewing angle on one side and the maximum one-side viewing angle on the other side. In other words, the maximum one-side viewing angle in one direction and the maximum one-side viewing angle in the other direction can be secured to be substantially the same.

Next, with reference to FIGS. 4 and 5 , we will look at various pixel structures that can be included in an organic light emitting display device according to an embodiment of the present invention, including the features described above.

Figure 4 is a plan view of various pixels that may be included in an organic light emitting display device according to an embodiment of the present invention.

If FIG. 3 is a diagram for explaining the structure of the pixel 300 in which the planar shape of the opening area 330 is polygonal, FIG. 4 shows the planar shape of the opening areas 430a, 430b, 430c, and 430d in FIG. This is a drawing to explain the pixel structure, which is different from the above. That is, several pixel plan views of FIG. 4 are similar to the pixel plan views of FIG. 3 .

The light-emitting areas 410a, 410b, 410c, and 410d in FIG. 4 correspond to the light-emitting area 310 in FIG. 3. Banks 420a, 420b, 420c, and 420d in FIG. 4 correspond to bank 320 in FIG. 3. The opening areas 430a, 430b, 430c, and 430d in FIG. 4 correspond to the opening area 330 in FIG. 3. The black matrices 440a, 440b, 440c, and 440d in FIG. 4 correspond to the black matrix 340 in FIG. 3. The subpixels 450a, 450b, 450c, and 450d in FIG. 4 correspond to the subpixel 350 in FIG. 3 . When describing FIG. 4 , if the same component name as that in FIG. 3 is used, the description in FIG. 3 applies equally to the description of the corresponding component. Therefore, when describing FIG. 4, parts to which the same description as in FIG. 3 is applied will be omitted, and parts to which different or additional explanations will be described will be described.

In Figure 4a, the planar shape of the opening area 430a is like the cross-sectional shape of a dumbbell, and W1 is the narrowest shape at the center of the opening area 430a.

That is, W1 of a portion of the opening area 430a is designed to be wider than W1 of the remaining area of the opening area 430a in relation to the light emitting area 410a. For example, some areas of the opening area 430a may be edge areas of the opening area 430a that are farther from the center of the opening area 430a than the remaining areas of the opening area 430a. As a result, a portion of the opening area 430a can be configured for a purpose that can maximize the maximum one-sided viewing angle as seen in FIG. 2.

And at the same time, the remaining area of the opening area 430a is designed to have W1 narrow in its relationship with the light emitting area 410a. For example, the remaining area of the opening area 430a may be an edge area of the opening area 430a that is closer to the center of the opening area 430a than a partial area of the opening area 430a. By making the width of the black matrix somewhat thicker without indiscriminately reducing W2 in the remaining area of the opening area 430a, the remaining area of the opening area 430a is protected from external light reflection and light leakage caused by the lower metal wire or metal electrode. It can be configured to reduce.

Figure 4b shows that the planar shape of the opening area 430b is like the cross-sectional shape of an hourglass, so that W1 is narrowest at the center of the opening area 430b, and the width of the opening area 430b gradually decreases from the center of the opening area 430b. As it goes to both sides, W1 gradually becomes wider. At this time, the closer the edge area of the opening area 430b is to the center of the opening area 430b, the corresponding width of W1 may gradually decrease.

That is, W1 of a portion of the opening area 430b is designed to be wider than W1 of the remaining area of the opening area 430a in relation to the light emitting area 410b. For example, some areas of the opening area 430b may be edge areas of the opening area 430b that are farther from the center of the opening area 430b than the remaining areas of the opening area 430b. As a result, a portion of the opening area 430b can be configured for a purpose that can maximize the maximum one-sided viewing angle as seen in FIG. 2.

And at the same time, the remaining area of the opening area 430b is designed to have W1 narrow in its relationship with the light emitting area 410b. For example, the remaining area of the opening area 430b may be an edge area of the opening area 430b that is closer to the center of the opening area 430b than a partial area of the opening area 430b. By making the width of the black matrix somewhat thicker without indiscriminately reducing W2 in the remaining area of the opening area 430b, the remaining area of the opening area 430b is protected from external light reflection and light leakage caused by the lower metal wire or metal electrode. It can be configured to reduce.

In Figure 4c, the planar shape of the opening area 430c is similar to the cross-sectional shape of a push bar, and W1 is the widest shape at the center of the opening area 430c.

That is, W1 of a portion of the opening area 430c is designed to be wider than W1 of the remaining area of the opening area 430c in relation to the light emitting area 410c. For example, some areas of the opening area 430c may be edge areas of the opening area 430c that are closer to the center of the opening area 430c than the remaining areas of the opening area 430c. As a result, a portion of the opening area 430c can be configured for a purpose that can maximize the maximum one-sided viewing angle as seen in FIG. 2.

And at the same time, the remaining area of the opening area 430c is designed to have W1 narrow in relation to the light emitting area 410c. For example, the remaining area of the opening area 430c may be an edge area of the opening area 430c that is farther from the center of the opening area 430c than a partial area of the opening area 430c. By making the width of the black matrix somewhat thicker without indiscriminately reducing W2 in the remaining area of the opening area 430c, the remaining area of the opening area 430c is protected from external light reflection and light leakage caused by the lower metal wire or metal electrode. It can be configured to reduce.

In particular, as shown in Figure 4c, the area where W1 is relatively wider has a better viewing angle as it is closer to the center of the aperture area 430c, that is, (0,0) of the virtual X-Y plane, than the area where W1 is relatively narrow. It is possible to secure it.

That is, when the subpixel 450c of Figure 4c and the subpixels 450a and 450b of Figures 4a and 4b include black matrices of the same or similar area, the planar shape of the opening area is as shown in Figure 4a. , It is possible to secure a better viewing angle when the opening area 430c of FIG. 4C has a planar shape than when the opening areas 430a and 430b of FIG. 4B have a planar shape.

Figure 4d shows that the planar shape of the opening area 430d is like the cross-sectional shape of a sausage, with the narrowest area W1 and the widest area W1 repeatedly existing, and the opening of the curve as the change in the width of W1 is gradual. The edge of the area 430d has a bulging shape.

That is, W1 of a portion of the opening area 430d is designed to be wider than W1 of the remaining area of the opening area 430d in relation to the light emitting area 410d. As a result, a portion of the opening area 430d can be configured for a purpose that can maximize the maximum one-sided viewing angle as seen in FIG. 2.

And at the same time, the remaining area of the opening area 430d is designed to have W1 narrow in relation to the light emitting area 410d. By making the width of the black matrix somewhat thicker without indiscriminately reducing W2 in the remaining area of the opening area 430d, the remaining area of the opening area 430d is protected from external light reflection and light leakage caused by the lower metal wire or metal electrode. It can be configured to reduce.

Figure 5 is a plan view of various pixels that may be included in an organic light emitting display device according to an embodiment of the present invention.

While FIG. 3 is a diagram to explain the structure of the pixel 300, which consists of a total of three sub-pixels 350 of RGB in a stripe structure, FIG. 5 shows a total of four RGB in a tile structure (one of the RGB). This diagram is intended to explain the pixel structure composed of subpixels 530a and 530b (two subpixels for each color). That is, several pixel plan views of FIG. 5 are similar to the pixel plan views of FIG. 3 .

The light-emitting areas 510a and 510b in FIG. 5 correspond to the light-emitting area 310 in FIG. 3 . Banks 520a and 520b in FIG. 5 correspond to bank 320 in FIG. 3 . The opening areas 530a and 530b in FIG. 5 correspond to the opening areas 330 in FIG. 3 . The black matrices 540a and 540b in FIG. 5 correspond to the black matrix 340 in FIG. 3 . Subpixels 550a and 550b in FIG. 5 correspond to subpixels 350 in FIG. 3 . When describing FIG. 5 , if the same component name as that in FIG. 3 is used, the description in FIG. 3 applies equally to the description of the corresponding component. Therefore, when describing FIG. 5, parts to which the same description as in FIG. 3 is applied will be omitted, and parts to which different or additional explanations will be described will be described.

5A shows that the vertex of the edge of the light emitting area 510a is located at the center of the edge of the opening area 530a, and the angle gradually increases from the vertex of the edge of the opening area 530a to the center of the edge of the opening area 530a. The width of W1 is narrowed.

That is, W1 of a partial area of the opening area 530a is designed to be wider than W1 of the remaining area of the opening area 530a in relation to the light emitting area 510a. At this time, a partial area of the opening area 530a where W1 is designed to be wide may be a vertex area of an edge of the opening area 530a. As a result, a portion of the opening area 530a can be configured for a purpose that can maximize the maximum one-sided viewing angle as seen in FIG. 2.

And at the same time, the remaining area of the opening area 530a is designed to have W1 narrow in relation to the light emitting area 510a. At this time, the remaining area of the opening area 530a where W1 is designed to be narrow may be the center area of the edge of the opening area 530a. By making the width of the black matrix somewhat thicker without indiscriminately reducing W2 in the remaining area of the opening area 530a, the remaining area of the opening area 530a is protected from external light reflection and light leakage caused by the lower metal wire or metal electrode. It can be configured to reduce.

In Figure 5b, the planar shape of the opening area 530b is cross-shaped, and the vertex of the edge of the light emitting area 510b is located at the edge of the opening area 530b.

That is, W1 of a portion of the opening area 530b is designed to be wider than W1 of the remaining area of the opening area 530b in relation to the light emitting area 510a. At this time, a partial area of the opening area 530b where W1 is designed to be wide may be an edge area of the opening area 530b that does not correspond to the vertex of the edge of the light emitting area 510b. As a result, a portion of the opening area 530b can be configured for a purpose that can maximize the maximum one-sided viewing angle as seen in FIG. 2.

At the same time, the remaining area of the opening area 530b is designed to have W1 narrow in relation to the light emitting area 510b. At this time, the remaining area of the opening area 530b in which W1 is designed to be narrow may be the remaining area of the opening area 530b corresponding to the vertex of the edge of the light emitting area 510a. By making the width of the black matrix somewhat thicker without indiscriminately reducing W2 in the remaining area of the opening area 530b, the remaining area of the opening area 530b is protected from external light reflection and light leakage caused by the lower metal wire or metal electrode. It can be configured to reduce.

In the following, we will compare the external light reflectance and luminance according to viewing angle through examples and comparative examples.

The embodiment is an organic electroluminescent display device that includes any of the exemplary pixels 300 included in the organic electroluminescent display device of FIG. 3 according to an embodiment of the present invention. The comparative example is a pixel 600 composed of a total of three RGB sub-pixels 650 in a stripe structure, in which the conventional planar shape of the light emitting area 610 and the planar shape of the opening area 630 of FIG. 6 are both stripes. It is an organic electroluminescence display device including.

The pixels 300 and 600 included in the examples and comparative examples include the same components, except that the planar shapes of the opening areas 330 and 630 are different. That is, in the embodiment, the width of W1 gradually widens from both sides of the opening area 330 toward the center of the opening area 330, while in the comparative example, the width gradually increases from both sides of the opening area 330. As you move toward the center of the opening area 330, the width of W1 becomes constant.

Figure 7 is a graph showing external light reflectance according to the wavelength of reflected external light in Examples and Comparative Examples. Since the Example and the Comparative Example include the same components except that the planar shapes of the opening areas 440 and 630 are different from each other, the graph trends are generally similar. However, it can be seen that as the wavelength increases, the external light reflectance value of the example is lower than that of the comparative example. In addition, it can be seen that in the wavelength range with high reflectance, the external light reflectance value of the example is lower than that of the comparative example.

From this, it can be seen that the visibility of the organic electroluminescent display device according to the embodiment of the present invention is improved as the external light reflectance is lowered, compared to the conventional organic electroluminescent display device having a typical opening area structure or pixel structure. You can.

Figure 8 is a graph showing the wavelength average luminance according to the viewing angle of Examples and Comparative Examples. It can be seen that as the viewing angle for measuring the average luminance of a wavelength increases, the luminance value of the example is higher than that of the comparative example. In particular, looking at the wavelength average luminance at a viewing angle of 60°, which is a standard in the industry, it can be seen that the luminance of the comparative example is close to 0 nits, while the luminance of the example exceeds about 25 nits.

From this, the organic electroluminescent display device according to the embodiment of the present invention has a wider viewing angle as the wavelength average luminance per viewing angle increases, compared to the conventional organic electroluminescent display device having a typical aperture area structure or pixel structure. It can be seen that this is secured.

The organic electroluminescent display device according to the present invention includes a first electrode, a bank overlapping the edge of the first electrode, a light emitting area defined by the bank, an organic light emitting layer located on the first electrode and the bank, a second electrode, and a second electrode. It includes a cementation layer positioned on the cementation layer, a black matrix positioned on the cementation layer, and an opening area defined by the black matrix, the area of the opening area is larger than the area of the light emitting area, and the center of the opening area is (0,0). In the virtual X-Y plane, the planar shape of the aperture area is symmetrical with respect to the X and Y axes of the virtual

At this time, in the organic electroluminescent display device according to the present invention, the planar shape of the opening area and the planar shape of the light emitting area may not be congruent or similar to each other.

At this time, the organic electroluminescent display device according to the present invention further includes a color filter on the adhesive layer, the distance between the first electrode and the color filter is set to H, and the distance from the edge of the arbitrary light emitting area to the edge of the opening area is set to H. When the width to the point is W, among the edge points of the light emitting area, there is an edge point of the light emitting area that has the maximum value of Θ1 of a virtual right triangle where H and W1 are at right angles, and that point The value of Θ1 may be arcsin(1/1.8) or less.

At this time, the organic electroluminescence display device according to the present invention sets the edge point of a random light-emitting area, sets the edge point of the opening area corresponding to the edge point of the random light-emitting area, and sets the edge point of the random light-emitting area. When the width from to the edge point of the opening area corresponding to the edge point of the arbitrary light-emitting area is W1, the value of W1 may be different for each edge point of the arbitrary light-emitting area.

At this time, in the organic electroluminescent display device according to the present invention, W1 of a portion of the opening area may be wider than W1 of the remaining area of the opening area.

At this time, in the organic electroluminescent display device according to the present invention, a partial area of the opening area may be an edge area of the opening area that is closer to the center of the opening area than the remaining area of the opening area.

At this time, the organic electroluminescence display device according to the present invention may have a shape in which W1 gradually narrows from the center of the opening area to both sides of the opening area.

At this time, in the organic electroluminescent display device according to the present invention, when the width of the black matrix located on the same straight line as W1 is W2, the point where W1 has the maximum value may be the point where W2 has the minimum value.

At this time, the organic light emitting display device according to the present invention has the same Y coordinate on the virtual X-Y plane, and the two W1 located on different sides of the X axis may have the same width.

At this time, the width of the organic electroluminescent display device according to the present invention from the edge of the light emitting area to the edge of the opening area may not be constant.

At this time, in the organic electroluminescent display device according to the present invention, depending on the position of the edge point of any light emitting area, there is a deviation in W1 corresponding to that point, and the deviation is symmetrical about the X or Y axis of the X-Y plane. It can be.

At this time, in the organic electroluminescent display device according to the present invention, the planar shape of the opening area is one of the following: a polygonal shape, a cross-sectional shape of a dumbbell, a cross-sectional shape of an hourglass, a cross-sectional shape of a rolling pin, or a cross-sectional shape of a sausage. You can.

Meanwhile, in the detailed description of the invention described above, an organic electroluminescent display device having a specific structure is disclosed, but the present invention is not limited to the organic electroluminescent display device having this specific structure. For example, in the above-described organic light emitting display device, a structure in which light is emitted from the top is disclosed, but the present invention is not limited to this structure, and a structure in which light is emitted from the bottom may also be applied.

200: Organic electroluminescent display device
210: Flattening layer
220: first electrode
230: bank
240: second electrode
250: Cementation layer
260: Black Matrix
270: Color filter
280: second substrate
290: Sub pixel

Claims (12)

A first substrate including a pixel composed of four sub-pixels;
a planarization layer located on the first substrate;
a first electrode located on the planarization layer;
a bank positioned over an edge of the first electrode and the planarization layer;
an organic light-emitting layer and a second electrode located on the bank and the first electrode;
a black matrix located on top of the second electrode and disposed at a position corresponding to the bank;
a color filter located on the black matrix and corresponding to each sub-pixel;
a light emitting area defined by the bank; and
It includes an opening area defined by the black matrix,
The four sub-pixels constituting the pixel are each sub-pixels for one of red, green, and blue colors,
Among the four subpixels, two subpixels are for the same color,
The organic light emitting display device wherein the vertex of the edge of the light emitting area is located at the center of the edge of the opening area.
According to paragraph 1,
The black matrix and the banks overlap an edge of the color filter.
In paragraph 1
An organic light emitting display device, wherein an area of the opening area is larger than an area of the light emitting area.
According to paragraph 1,
An organic light emitting display device wherein the width of the upper surface of the black matrix and the width of the lower surface of the black matrix are different from each other.
According to paragraph 1,
An organic light emitting display device wherein the width of the upper surface of the bank is greater than the width of the lower surface of the black matrix.
According to paragraph 1,
The side of the black matrix and the side of the bank are inclined,
An organic light emitting display device wherein an inclination angle of a side of the black matrix and an inclination angle of a side of the bank are different from each other.
According to paragraph 3,
Further comprising a second substrate located on the black matrix and the color filter,
An organic light emitting display device, wherein the second substrate is made of a plastic-based polymer material.
In clause 7,
An air layer is located on the second substrate,
The maximum value of the incident angle of light at the interface between the second substrate and the air layer is formed by the distance between the first electrode and the color filter and the distance from the edge point of the light emitting area to the edge point of the opening area. Light emitting display device.
According to clause 8,
An organic light emitting display device, wherein an edge point of the light emitting area is formed such that the maximum refraction angle of light incident at the interface between the second substrate and the air layer is 90°.
According to paragraph 3,
If the distance between the first electrode and the color filter is H, and the width from an edge point of the light emitting area to an edge point of the aperture area is W,
Among the edge points of the light-emitting area, H and W form a right angle, and the angle between the H and the hypotenuse is among the interior angles of a virtual right triangle with the light emitted from the edge point of the light-emitting area as the hypotenuse. An organic light emitting display device, characterized in that there is an edge point of the light emitting area where Θ1 has a maximum value, and the value of Θ1 at that point is arcsin (1/1.8) or less. According to paragraph 1,
An organic light emitting display device, wherein an inclined surface of the bank and an end of the black matrix are disposed on the same plane. According to paragraph 1,
By setting an edge point of the light-emitting area, and setting an edge point of the opening area corresponding to an edge point of the light-emitting area,
When the width from an edge point of an arbitrary light-emitting area to an edge point of the opening area corresponding to an arbitrary edge point of the light-emitting area is W1,
The organic light emitting display device wherein the width of W1 gradually narrows from the vertex of the edge of the opening area to the center of the edge of the opening area.