KR102484901B1 - Organic Light Emitting Diode Display Device - Google Patents

Abstract

Disclosed is an organic light emitting display device. The disclosed organic light emitting display device of the present invention includes a substrate divided into a plurality of sub-pixels, a reflective layer disposed for each sub-pixel on the substrate, a color layer disposed overlapping the reflective layer, a first electrode disposed overlapping the reflective layer, It includes an organic light emitting layer disposed on the first electrode and a second electrode disposed on the organic light emitting layer.

Description

Organic Light Emitting Diode Display Device}

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device capable of reducing reflectance of the organic light emitting display device and improving light efficiency.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Recently, liquid crystal display devices (LCD: liquid crystal display device), plasma display devices (PDP: Various flat panel display devices such as organic light emitting diode display devices (OLEDs) are being utilized.

Among such display devices, an organic light emitting display device uses a self-light emitting device, so it can be lightweight and thin because it does not require a backlight used in a liquid crystal display device using a non-light emitting device. In addition, the organic light emitting display device has an excellent viewing angle and contrast ratio compared to the liquid crystal display device, and is advantageous in terms of power consumption. In addition, the organic light emitting display device can be driven at low DC voltage, has a fast response speed, is resistant to external shocks because internal components are solid, has a wide operating temperature range, and has low manufacturing cost.

Such an organic light emitting display device displays an image in a top emission method or a bottom emission method according to a structure of an organic light emitting device including a first electrode, a second electrode, and an organic light emitting layer. The bottom emission method displays visible light generated from the organic light emitting layer toward the lower side of the substrate on which TFTs are formed, whereas the top emission method displays visible light generated from the organic light emitting layer toward the upper portion of the substrate on which TFTs are formed.

Meanwhile, the organic light emitting display device includes a polarizing plate including a circular polarizing plate and a linear polarizing plate, through which black of the organic light emitting display device is realized and external light reflection is reduced to improve visibility. However, when an organic light emitting display device uses a polarizer, external light is confined within the display device, so that external light cannot be used, and it is difficult to apply it to a flexible display or foldable display due to the polarizer of the polarizer. there is a problem.

Accordingly, there is a demand for an organic light emitting display device capable of solving these problems.

An object of the present invention is to provide an organic light emitting display device capable of improving light efficiency and lowering reflectance in an organic light emitting display device that does not use a circular polarizing plate or a linear polarizing plate.

An organic light emitting display device of the present invention to solve the problems of the prior art as described above includes a substrate divided into a plurality of sub-pixels, a reflective layer disposed for each sub-pixel on the substrate, a color layer disposed overlapping the reflective layer, and It includes a first electrode disposed overlapping the reflective layer, an organic light emitting layer disposed on the first electrode, and a second electrode disposed on the organic light emitting layer.

Here, the color layer may transmit light of a wavelength of 620 nm to 640 nm, light of a wavelength of 560 nm to 590 nm, or light of a wavelength of 450 nm to 460 nm.

Also, both ends of the color layer may be configured to match both ends of the reflective layer.

Also, a color layer may be disposed on the reflective layer, and a first electrode of an organic light emitting device may be disposed on the color layer.

Also, a first electrode may be disposed on the reflective layer, and a color layer may be disposed on the second electrode.

Further, a bank pattern overlapping a portion of the upper surface of the first electrode may be included, and the bank pattern may be divided into a first region, a second region, and a third region. Here, the first area is an area of a bank pattern overlapping a first electrode disposed in one sub-pixel, and the third area is a first electrode disposed in another sub-pixel disposed adjacent to the one sub-pixel. An area of a bank pattern overlapping with , and the second area may be an area of a bank pattern that does not overlap with the first electrode.

The organic light emitting display device according to the present invention includes a color layer overlapping the reflective layer and the first electrode of the organic light emitting device even without a polarizing plate, thereby lowering the reflectance of external light and displaying an image using external light at the same time. It has the effect of improving efficiency.

In addition, the organic light emitting display device according to the present invention has an effect of reducing power consumption by improving light efficiency using external light.

In addition, since the organic light emitting display device according to the present invention includes a bank pattern divided into first to third areas, the light emitting area of the organic light emitting display device can be expanded.

1 is a schematic system configuration diagram of a display device according to the present embodiments.
2 is a plan view of an organic light emitting display device according to a first embodiment of the present invention.
3 is a cross-sectional view of an organic light emitting display device according to a first embodiment of the present invention taken along AB.
4 is a cross-sectional view illustrating an organic light emitting display device including a conductive layer according to another exemplary embodiment of the present invention.
5 is a cross-sectional view of an organic light emitting display device including a first electrode according to another exemplary embodiment of the present invention.
6 is a plan view of an organic light emitting display device according to a second exemplary embodiment of the present invention.
7 is a cross-sectional view taken along CD of an organic light emitting display device according to a second embodiment of the present invention.
8 is a plan view of an organic light emitting display device according to a third exemplary embodiment of the present invention.
9 is a cross-sectional view taken along EF of an organic light emitting display device according to a third exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments introduced below are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other shapes. And in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers indicate like elements throughout the specification.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different shapes, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of explanation.

When an element or layer is referred to as “on” or “on” another element or layer, it includes both cases where another element or layer is intervening as well as directly on another element or layer. do. On the other hand, when an element is referred to as “directly on” or “directly on”, it indicates that no other element or layer is intervening.

The spatially relative terms "below, beneath", "lower", "above", "upper", etc., refer to one element or component as shown in the drawing. It can be used to easily describe the correlation between and other elements or components. Spatially relative terms should be understood as terms that include different orientations of elements in use or operation in addition to the directions shown in the figures. For example, when flipping elements shown in the figures, elements described as “below” or “beneath” other elements may be placed “above” the other elements. Thus, the exemplary term “below” may include directions both below and above.

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

1 is a schematic system configuration diagram of a display device according to the present embodiments. Referring to FIG. 1 , a display device 1000 according to the present embodiments includes a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn, and a plurality of sub pixels. The disposed display panel 1100, the data driver 1200 driving the plurality of data lines DL1 to DLm, the gate driver 1300 driving the plurality of gate lines GL1 to GLn, the data driver 1200, and A timing controller 1400 controlling the gate driver 1300 and the like are included.

The data driver 1200 drives a plurality of data lines by supplying data voltages to the plurality of data lines. The gate driver 1300 sequentially drives the plurality of gate lines by sequentially supplying scan signals to the plurality of gate lines.

Also, the timing controller 1400 controls the data driver 1200 and the gate driver 1300 by supplying a control signal to the data driver 1200 and the gate driver 1300 . The timing controller 1400 starts scanning according to the timing implemented in each frame, converts input image data input from the outside to suit the data signal format used by the data driver 1200, and outputs the converted image data. , data drive is controlled at an appropriate time according to the scan.

Under the control of the timing controller 1400, the gate driver 1300 sequentially supplies scan signals of an on voltage or an off voltage to a plurality of gate lines to sequentially drive the plurality of gate lines. . In addition, the gate driver 1300 may be located on only one side of the display panel 1100, as shown in FIG. 1, or may be located on both sides in some cases, depending on a driving method or a design method of the display panel.

In addition, the gate driver 1300 may include one or more gate driver integrated circuits. Each gate driver integrated circuit is connected to a bonding pad of the display panel 1100 using a tape automated bonding (TAB) method or a chip on glass (COG) method, or a gate in panel (GIP) type. , and may be directly disposed on the display panel 1100 or may be integrated and disposed on the display panel 1100 in some cases.

In addition, each gate driver integrated circuit may be implemented in a Chip On Film (COF) method. In this case, a gate driving chip corresponding to each gate driving integrated circuit may be mounted on a flexible film, and one end of the flexible film may be bonded to the display panel 1100 .

When a specific gate line is opened, the data driver 1200 converts the image data received from the timing controller 1400 into analog data voltages and supplies them to a plurality of data lines, thereby driving the plurality of data lines. Also, the data driver 1200 may include at least one source driver integrated circuit to drive a plurality of data lines.

Each source driver integrated circuit is connected to a bonding pad of the display panel 1100 through a tape automated bonding (TAB) method or a chip on glass (COG) method, or is directly connected to the display panel 1100. In some cases, it may be integrated and arranged on the display panel 1100 .

In addition, each source driver integrated circuit may be implemented in a Chip On Film (COF) method. In this case, a source driving chip corresponding to each source driver integrated circuit is mounted on a flexible film, one end of the flexible film is bonded to at least one source printed circuit board (Source Printed Circuit Board), and the other end is a display panel ( 1100).

The source printed circuit board is connected to the control printed circuit board through a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit (FPC). A timing controller 1400 is disposed on the control printed circuit board.

In addition, a power controller (not shown) may be further disposed on the control printed circuit board to supply voltage or current to the display panel 1100, the data driver 1200, and the gate driver 1300 or to control the voltage or current to be supplied. there is. The source printed circuit board and the control printed circuit board mentioned above may be a single printed circuit board.

Meanwhile, a pixel of the present invention includes one or more subpixels. For example, a pixel of the present invention may include three sub-pixels, but is not limited thereto. For example, a pixel of the present invention may include 4 sub-pixels.

The sub-pixel refers to a unit in which a specific type of color filter is formed or an organic light emitting device can emit light of a specific color without a color filter. Colors defined by the sub-pixels may include red (R), green (G), blue (B), and optionally white (W), but the present invention is not limited thereto.

In addition, an electrode connected to a thin film transistor that controls light emission of each sub-pixel region of the display panel is referred to as a first electrode, and an electrode disposed on the entire surface of the display panel or disposed to cover two or more pixel regions is referred to as a second electrode. . When the first electrode is an anode electrode, the second electrode becomes a cathode electrode, and vice versa. Hereinafter, an anode electrode as an embodiment of the first electrode and a cathode electrode as an embodiment of the second electrode will be mainly described, but the present invention is not limited thereto.

In addition, organic light emitting display devices according to embodiments of the present invention will be described with a focus on top-emission type organic light emitting display devices, but in some cases, embodiments of the present invention are bottom-emission type organic light emitting display devices. Alternatively, it may also be applied to a dual-emission method.

A plan view of the organic light emitting display device according to the first embodiment of the present invention is as follows. 2 is a plan view of an organic light emitting display device according to a first embodiment of the present invention.

Referring to FIG. 2 , in the organic light emitting display device according to the present invention, subpixels SP1 , SP2 , and SP3 are respectively disposed in regions where the gate line 10 and the data line 20 intersect. Here, the sub-pixel may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. In this case, the first sub-pixel SP1 is a red (R) sub-pixel, the second sub-pixel SP2 is a green (G) sub-pixel, and the third sub-pixel SP3 is a blue (B) sub-pixel. can be

Meanwhile, although FIG. 2 shows that one pixel P includes three subpixels SP1, SP2, and SP3, the present invention is not limited thereto, and one pixel P includes four subpixels. may also include

In this case, one pixel P further includes a fourth sub-pixel, and the fourth sub-pixel may be a white sub-pixel. However, the exemplary embodiment of the present invention is not limited thereto, and subpixels of three colors may be used even when one pixel P is composed of four subpixels.

Meanwhile, in the embodiments to be described later, the description will focus on embodiments in which one pixel P includes three sub-pixels SP1 , SP2 , and SP3 .

A driving unit including a thin film transistor is disposed in each of the sub-pixels SP1 , SP2 , and SP3 , and a display unit including a light emitting region is disposed above the driving unit. The thin film transistor includes a gate electrode 101, an active layer 103, a source electrode 104 and a drain electrode 105.

In addition, the first electrode 130 of the organic light emitting device connected to the drain electrode 105 of the thin film transistor is disposed. A bank pattern disposed to expose a portion of the upper surface of the first electrode 130 defines a light emitting region of each of the sub-pixels SP1 , SP2 , and SP3 . That is, a partial region of the upper surface of the first electrode 130 on which the bank pattern is not disposed may correspond to the emission region of each sub-pixel SP1, SP2, and SP3.

In addition, color layers having different colors are disposed under the first electrode 130 disposed in each of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3.

A detailed examination of such a configuration through cross-sectional views taken along A-B of the organic light emitting display device according to the first embodiment of the present invention is as follows. 3 is a cross-sectional view taken along A-B of an organic light emitting display device according to a first embodiment of the present invention.

Referring to FIG. 3 , the first substrate 100 of the organic light emitting display device according to the first exemplary embodiment of the present invention is divided into a plurality of sub-pixel areas. The first substrate 100 may be divided into first to third sub-pixel areas.

a thin film transistor (Tr) disposed on each sub-pixel region of the first substrate (100) and an organic light emitting device (EL) electrically connected to the thin film transistor (Tr); ) And a second substrate 200 disposed facing the. Also, the first substrate 100 and the second substrate 200 may be bonded together through an adhesive layer or an adhesive layer disposed between the first substrate 100 and the second substrate 200 .

In detail, the thin film transistor Tr includes a gate electrode 101, an active layer 103, a source electrode 104 and a drain electrode 105. The organic light emitting element EL includes a first electrode 130 , an organic light emitting layer 140 and a second electrode 150 .

More specifically, gate electrodes 101 are disposed in each sub-pixel region of the first substrate 100 . A gate insulating layer 102 is disposed on the first substrate 100 including the gate electrode 101 .

An active layer 103 is disposed in each sub-pixel so as to overlap the gate electrodes 101 on the first substrate 100 on which the gate insulating layer 102 is disposed. In addition, although not shown, an etch stop layer for protecting a channel region of the active layer 103 may be further disposed on the active layer 103 .

In addition, a source electrode 104 and a drain electrode 105 overlapping the active layers 103 and spaced apart from each other are provided. In addition, although the source electrode 14 and the drain electrode 105 are composed of a single layer in the drawing, in some cases, at least two or more metal layers may be laminated. As such, the thin film transistor Tr may be disposed on the first substrate 100 .

An interlayer insulating layer 106 and a planarization layer 107 are disposed on the first substrate 100 including the thin film transistor Tr. Here, a contact hole exposing a part of the drain electrode 105 of the thin film transistor Tr may be formed in the interlayer insulating layer 106 and the planarization layer 107 .

The first electrode 130 of the organic light emitting device connected to the drain electrode 105 of the thin film transistor Tr through the contact hole is disposed on the planarization layer 107 . The first electrode 130 is made of transparent conductive materials such as indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide. ; ITZO), but the material of the first electrode 130 is not limited thereto.

Here, a color layer 120 and a reflective layer 110 may be further disposed below the first electrode 130 . In detail, the color layer 120 may be disposed below the first electrode 130 , and the reflective layer 110 may be disposed below the color layer 120 .

At this time, the reflective layer 110 is in direct contact with the drain electrode 105 of the thin film transistor Tr through a contact hole formed in the planarization film 107, and the first electrode 130 is the reflective layer ( 110) may be electrically connected to the drain electrode 105. Here, both ends of the first electrode 130 may be configured to coincide with both ends of the reflective layer 110 . Through this, the process of forming the first electrode 130 and the reflective layer 110 can be simplified.

In addition, the arrangement relationship between the first electrode 130 and the reflective layer 110 is not limited thereto. This is reviewed with reference to FIG. 4 as follows. 4 is a cross-sectional view illustrating an organic light emitting display device including a conductive layer according to another exemplary embodiment of the present invention.

Referring to FIG. 4 , a conductive layer 109 may be further disposed below the reflective layer 110 . In this case, the conductive layer 109 may be made of the same material as the first electrode 130 .

For example, the conductive layer 109 may include transparent conductive materials such as indium tin oxide (ITO), indium zinc oxide (IZO), and indium-tin-zinc-oxide (Indium tin oxide). tin zinc oxide; ITZO). Accordingly, hole injection into the organic light emitting layer 140 of the organic light emitting element EL may be facilitated.

In addition, the shape of the first electrode 130 of the organic light emitting element EL is not limited thereto, and may be formed as shown in FIG. 5 . 5 is a cross-sectional view of an organic light emitting display device including a first electrode according to another exemplary embodiment of the present invention.

Referring to FIG. 5 , the first electrode 131 of the organic light emitting display device according to another embodiment of the present invention may be formed to surround side portions of the color layer 120 and the reflective layer 110 . That is, the first electrode 131 may be disposed to contact the side of the reflective layer 110 . Through this, electrical connection between the drain electrode 105 and the first electrode 131 of the thin film transistor Tr, which is in contact with the reflective layer 110, can be smoothly made.

In FIG. 3 , the color layer 120 may be disposed in each sub-pixel, and the color layer 120 may transmit light of different wavelengths in each sub-pixel. For example, three sub-pixels constituting one pixel include a color layer that transmits light of 620 nm to 640 nm wavelength, a color layer that transmits light of 560 nm to 590 nm wavelength, or a color layer that transmits light of 450 nm to 460 nm wavelength, respectively. A color layer may be disposed. That is, a color layer that transmits light in a wavelength range of any one of red, green, and blue light may be disposed in each of the three sub-pixels.

Also, the reflective layer 110 reflects light traveling toward the first substrate 100 among light emitted from the organic light emitting layer 140 disposed on the first electrode 130 of the organic light emitting element EL. to emit light in the direction of the second substrate 200 of the organic light emitting display device. Therefore, the second electrode 150 of the organic light emitting element EL may be made of a transparent conductive material, and the second substrate 200 may also be made of a transparent material. Through this, light generated from the organic light emitting element EL may be emitted toward the second substrate 200 .

On the other hand, in each sub-pixel, among the light generated from the organic light emitting element EL, the light toward the first substrate 100 passes through the color layer 120 and reaches the reflective layer 110, and the reflective layer The light reaching 110 is reflected again by the reflective layer 110 and emitted to the outside of the second substrate 200 via the color layer 120 (a). In this case, as a part of the light generated from the organic light emitting element EL passes through the color layer 120, the color reproducibility may be increased.

In addition, the organic light emitting display device according to embodiments of the present invention may not include a polarizing plate including a circular polarizing plate and a linear polarizing plate, which makes it difficult to implement a flexible display or a foldable display. When external light is incident on the display device, the polarizing plate may be reflected through the reflective layer to prevent the external light from escaping to the outside again, and may confine the external light inside the display device.

In this way, by confining external light inside the display device, the reflectance of the display device can be lowered. However, the polarizing plate includes a plurality of polarizers, and it is difficult to apply the polarizer to a flexible display device due to the inflexibility of the polarizer.

Accordingly, in embodiments of the present invention, a structure in which a polarizer is omitted for reducing external light reflectance may be applied to realize a flexible display device or a foldable display device. Meanwhile, the color layer 120 applied to the organic light emitting display device according to the first embodiment of the present invention has an effect of lowering the reflectance of external light.

In detail, external light incident on the second substrate 200 from the outside reaches the reflective layer 110 and is reflected, so that it is incident on the color layer 120, and the light incident on the color layer 120 has a specific Only the light of the wavelength band is transmitted and emitted to the outside of the second substrate 200 .

That is, the organic light emitting display device according to the first exemplary embodiment of the present invention may convert external light into colors emitted by each sub-pixel through the color layer 120 . Accordingly, there is an effect of improving light efficiency of the organic light emitting display device. In other words, since external light is reflected by the reflective layer 110 and then passed through the color layer 120 according to a wavelength band of light emitted from each sub-pixel, the efficiency of the organic light emitting display device can be increased.

For example, when it is assumed that the organic light emitting diode (EL) disposed on the first sub-pixel emits red (R) light, the color layer 120 disposed on the first sub-pixel has a wavelength of 620 nm to 640 nm. can transmit light. At this time, external light is incident and reaches the reflective layer 110, and the light reaching the reflective layer 110 is reflected and incident on the color layer 120, so that only light with a wavelength of 620 nm to 640 nm is transmitted, and the remaining wavelengths are transmitted. light is absorbed

That is, the color layer disposed in one sub-pixel can transmit light in the same wavelength range as the emission color wavelength range of the organic light emitting layer. As a result, only light having a wavelength of 620 nm to 640 nm is emitted to the outside of the second substrate 200 . Therefore, there is an effect of improving light efficiency and enhancing external visibility by using external light as well as light generated from the organic light emitting element EL.

Meanwhile, both ends of the color layer 120 may be disposed to coincide with both ends of the reflective layer 110 . Through this, all external light incident on the organic light emitting display device may be reflected by the reflective layer 110 and pass through the color layer 120 .

In other words, when both ends of the color layer 120 are disposed to expose a portion of the reflective layer 110, external light may be reflected by the reflective layer 110 and emitted to the outside of the display device as it is. Therefore, as external light reflected in the display device enters the user's eyes, visibility deteriorates. Therefore, when the color layer 120 is disposed without an area exposing the reflective layer 110 as in the first embodiment of the present invention, there is an effect of lowering the reflectance of external light.

Next, referring to FIGS. 6 and 7 , an organic light emitting display device according to a second exemplary embodiment of the present invention will be described. 6 is a plan view of an organic light emitting display device according to a second exemplary embodiment of the present invention. 7 is a cross-sectional view taken along line C-D of an organic light emitting display device according to a second embodiment of the present invention.

An organic light emitting display device according to a second embodiment of the present invention may include the same elements as those of the above-described embodiment. A description overlapping with the above-described embodiment may be omitted. Also, the same components have the same reference numerals.

Referring to FIG. 6 , subpixels SP1 , SP2 , and SP3 are respectively disposed in regions where the gate line 10 and the data line 20 intersect. Here, the sub-pixel may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3.

Here, the color layer 121 may be disposed on the first electrode of the organic light emitting device electrically connected to the drain electrode 105 of the thin film transistor disposed in each of the sub-pixels SP1 , SP2 , and SP3 .

A review of this configuration through FIG. 7, which is a cross-sectional view taken along C-D, is as follows. Referring to FIG. 7 , a thin film transistor Tr is disposed in each sub-pixel of the organic light emitting display device according to the second exemplary embodiment of the present invention.

Each drain electrode 105 of the thin film transistor may contact the reflective layer 110 through a contact hole. A first electrode 132 of an organic light emitting diode EL may be disposed on the reflective layer 110 . Also, a color layer 121 may be disposed on the first electrode 132 . Here, since the first electrode 132 is disposed on the reflective layer 110 , the first electrode 132 may be electrically smoothly connected to the drain electrode 105 .

In this case, the color layer 121 may transmit light of different wavelengths in each sub-pixel. For example, three sub-pixels constituting one pixel include a color layer that transmits light of 620 nm to 640 nm wavelength, a color layer that transmits light of 560 nm to 590 nm wavelength, or a color layer that transmits light of 450 nm to 460 nm wavelength, respectively. A color layer may be disposed. That is, a color layer that transmits light in a wavelength range of any one of red, green, and blue light may be disposed in each of the three sub-pixels.

Meanwhile, both ends of the color layer 121 may be configured to coincide with both ends of the reflective layer 110 . Through this, all external light incident on the organic light emitting display device may be reflected by the reflective layer 110 and emitted to the outside of the second substrate 200 through the color layer 121 . Therefore, in each sub-pixel, external light as well as light generated from the organic light emitting element EL is emitted to the outside of the second substrate 200 according to a specific wavelength range by the color layer 121, thereby improving light efficiency. Accordingly, there is an effect of reducing power consumption.

Next, referring to FIGS. 8 and 9 , an organic light emitting display device according to a third exemplary embodiment of the present invention will be reviewed. 8 is a plan view of an organic light emitting display device according to a third exemplary embodiment of the present invention. 9 is a cross-sectional view taken along E-F of an organic light emitting display device according to a third exemplary embodiment of the present invention.

An organic light emitting display device according to a third embodiment of the present invention may include the same elements as those of the previous embodiments. A description overlapping with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

Referring first to FIG. 8 , in an organic light emitting display device according to a third exemplary embodiment of the present invention, one pixel P includes a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. ) may be included. Each of the subpixels SP1 , SP2 , and SP3 includes a bank pattern 180 disposed to expose a portion of the upper surface of the first electrode 130 of the organic light emitting device.

The bank pattern 180 defines an emission area of each of the sub-pixels SP1 , SP2 , and SP3 . That is, a partial region of the upper surface of the first electrode 130 on which the bank pattern 180 is not disposed may correspond to the emission region of each sub-pixel SP1 , SP2 , and SP3 .

Meanwhile, the bank pattern 180 may be divided into a first area, a second area, and a third area. The first to third regions may be divided based on the first electrode.

In detail, the region of the bank pattern 180 disposed to overlap the first electrode is defined as a first region and a third region, respectively, and the region of the bank pattern 180 disposed not to overlap the first electrode is defined as a first region and a third region, respectively. It can be defined as the second area.

The above structure will be described with reference to FIG. 9 as follows. Referring to FIG. 9 , a thin film transistor Tr is disposed in each sub-pixel of the organic light emitting display device according to the third exemplary embodiment of the present invention. Each drain electrode 105 of the thin film transistor may contact the reflective layer 110 through a contact hole. A color layer 120 may be disposed on the reflective layer 110 , and a first electrode 130 of an organic light emitting diode EL may be disposed on the color layer 120 .

At this time, each of the three sub-pixels constituting one pixel includes a color layer that transmits light of a wavelength of 620 nm to 640 nm, a color layer that transmits a wavelength of 560 nm to 590 nm, or a color layer that transmits a wavelength of 450 nm to 460 nm. Layers can be placed.

A bank pattern 180 defining an emission area EA and a non-emission area NEA is disposed on a portion of the upper surface of the first electrode 130 . The bank pattern 180 is divided into a first region 181 , a second region 182 , and a third region 183 .

In this case, the first region 181 is the region of the bank pattern 180 overlapping the first electrode 130 of the organic light emitting element EL disposed in one sub-pixel, and the third region 183 is This is the region of the bank pattern 180 overlapping the first electrode 130 of the organic light emitting element EL disposed in another adjacent sub-pixel. Also, the second region 182 is defined as a region of the bank pattern 180 that is not disposed to overlap the first electrode 130 of the organic light emitting element EL.

Meanwhile, the first region 181, the second region 182, and the third region 183 of the bank pattern 180 may be formed in different colors. In detail, the first region 181 of the bank pattern 180 is made of the same color as the color layer 120 overlapping the first electrode 130 disposed overlapping the first region 181. can

In addition, the third region 183 of the bank pattern 180 is an organic material having the same color as the color layer 120 overlapping the first electrode 130 disposed to overlap the third region 183. can be made with Also, the second region 182 of the bank pattern 180 may be made of a transparent organic material or an opaque organic material. For example, the second region may be a transparent bank or a black bank.

As described above, since the bank pattern 180 is divided into the first area 181, the second area 182, and the third area 183, the light emitting area EA of the organic light emitting display device can be widened.

For example, among the light emitted from the organic light emitting element EL disposed in one sub-pixel area, light directed toward the first substrate 100 is reflected by the reflective layer 110 and then returned to the second substrate ( 200), the route is changed. At this time, the light path changed by the reflective layer 110 reaches the color layer 120 .

Here, when the color layer 120 is a color layer 120 that transmits light with a wavelength of 620 nm to 640 nm, the first region 181 of the bank pattern 180 also has a wavelength of 620 nm to 640 nm. It transmits light and absorbs light of other wavelengths. Therefore, among the light passing through the color layer 120 and reaching the first region 181 of the bank pattern 180, only light having a wavelength of 620 nm to 640 nm can pass through the first region 181. there is. Accordingly, light transmitted through the first region 181 of the bank pattern 180 may be displayed as an image.

That is, in the organic light emitting display device according to the third exemplary embodiment of the present invention, the emission area may be as wide as the area where the first area 181 and the third area 183 of the bank pattern 180 are disposed. In this case, the second region 182 of the bank pattern 180 may prevent color mixing between adjacent sub-pixels.

As described above, the organic light emitting display device according to embodiments of the present invention includes a color layer overlapping the reflective layer and the first electrode of the organic light emitting device without including a polarizer, thereby lowering the reflectance of external light and using external light at the same time. There is an effect of improving light efficiency by displaying an image by using the same. In addition, there is an effect of reducing power consumption by improving light efficiency using external light, and having a bank pattern divided into first to third areas, an effect of widening the light emitting area of the organic light emitting display device. there is.

The features, structures, effects, etc. described in the foregoing embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified with respect to other embodiments by those skilled in the art in the field to which the embodiments belong. Therefore, contents related to these combinations and variations should be construed as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention belongs can exemplify the above to the extent that does not deviate from the essential characteristics of the present embodiment. It will be seen that various variations and applications that have not been made are possible. For example, each component specifically shown in the embodiments can be modified and implemented.

100: first substrate
110: reflective layer
120: color layer
130: first electrode
140: organic light emitting layer
150: second electrode
200: second substrate

Claims (14)

a substrate divided into a plurality of sub-pixels;
a reflective layer disposed for each sub-pixel on the substrate;
a color layer disposed on the reflective layer;
a first electrode disposed on the color layer;
an organic light emitting layer disposed on the first electrode; and
A second electrode disposed on the organic light emitting layer; includes,
The first electrode surrounds a side of the color layer and contacts the reflective layer.
According to claim 1,
The color layer transmits light with a wavelength of 620 nm to 640 nm, light with a wavelength of 560 nm to 590 nm, or light with a wavelength of 450 nm to 460 nm.
According to claim 1,
An organic light emitting display device in which a color layer disposed in one sub-pixel transmits light of a wavelength identical to that of an emission color of the organic light emitting layer.
According to claim 1,
Both ends of the color layer coincide with both ends of the reflective layer.
According to claim 1,
wherein the first electrode and the second electrode are made of a transparent conductive material.
delete delete delete According to claim 1,
An organic light emitting display device further comprising a conductive layer disposed under the reflective layer.
According to claim 1,
A first electrode of an organic light emitting device is disposed on the reflective layer,
An organic light emitting display device comprising a color layer disposed on the first electrode.
According to claim 1,
Further comprising a bank pattern overlapping a portion of the upper surface of the first electrode,
The bank pattern is divided into a first region, a second region, and a third region.
According to claim 11,
The first region and the third region are regions of a bank pattern overlapping the first electrode of the organic light emitting device,
The second region is a region of a bank pattern that does not overlap the first electrode of the organic light emitting device.
According to claim 12,
The first region and the third region are each made of an organic material having the same color as a color layer overlapping a first electrode disposed overlapping the first region and the third region,
The second region is an organic light emitting display device made of a transparent or opaque organic material.
According to claim 11,
The light emitting area of one sub-pixel is
Organic light emission including a partial region of the upper surface of the first electrode exposed by the bank pattern, a region corresponding to the first region of the bank pattern, and a region corresponding to a third region of another bank pattern disposed adjacent thereto display device.

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