KR20210068851A - Display device - Google Patents

Abstract

According to an example of the present application, a display device comprises: a substrate having a first sub-pixel and a second sub-pixel; a first electrode disposed on each of the first sub-pixel and the second sub-pixel; an organic light emitting layer disposed on the first electrode; a bank provided between the first sub-pixel and the second sub-pixel while covering an end of the first electrode; and a light path changing structure disposed on the bank. The light path changing structure is provided so as to be in contact with at least a portion of the organic light emitting layer to change a path of light so as to prevent the light emitted from a sub-pixel from spreading toward an adjacent sub-pixel, thereby increasing optical efficiency of the sub-pixel that emits the light.

Description

display device {DISPLAY DEVICE}

The present application relates to a display device for displaying an image.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms. Accordingly, in recent years, various display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting display (OLED) have been used.

Among the display devices, the organic light emitting display device is a self-emission type display device, which has superior viewing angle and contrast ratio compared to a liquid crystal display device (LCD), and does not require a separate backlight, so it is lightweight and thin, and power consumption is advantageous. . In addition, the organic light emitting display device can be driven with a low DC voltage, has a fast response speed, and has advantages of low manufacturing cost.

Recently, there is an increasing demand for a display device requiring a high resolution equivalent to Augmented Reality (AR) and Virtual Reality (VR) or equivalent level using such an organic light emitting display device.

Meanwhile, in the organic light emitting display device, since some of the light emitted from the organic light emitting layer is not condensed to the center of the corresponding pixel but spreads to the outside, there is a problem in that the light efficiency is reduced. This problem is further exacerbated in the case of a head mounted display (HMD) including an organic light emitting diode display. Accordingly, research on a display device capable of improving light efficiency is being actively conducted.

An object of the present application is to provide a display device capable of improving light efficiency.

A display device according to an example of the present application includes a substrate including a first sub-pixel and a second sub-pixel, a first electrode disposed on each of the first sub-pixel and the second sub-pixel, and an organic light emitting layer disposed on the first electrode , a bank provided between the first sub-pixel and the second sub-pixel while covering an end of the first electrode, and an optical path changing structure disposed on the bank, wherein the optical path changing structure is in contact with at least a portion of the organic light emitting layer It can be provided as much as possible.

The display device according to the present application includes a light path changing structure in contact with at least a portion of an organic light emitting layer on a bank, thereby changing a light path to prevent light emitted from a sub pixel from spreading to an adjacent sub pixel to emit light. It is possible to improve the light efficiency of the pixel.

In addition to the effects of the present application mentioned above, other features and advantages of the present application will be described below, or will be clearly understood by those of ordinary skill in the art to which this application belongs from the description and description.

1 is a schematic plan view of a display device according to an example of the present application.
FIG. 2 is a schematic cross-sectional view taken along line I-I shown in FIG. 1 .
3 is a schematic enlarged view of part A of FIG. 2 .
4A to 4Q are schematic cross-sectional views of a manufacturing process of a display device according to an example of the present application.
5 is a schematic cross-sectional view of a display device according to a second exemplary embodiment of the present application.
6 is a graph comparing the front luminance of the display device of FIGS. 1 and 5 and the conventional display device.
7 is a schematic cross-sectional view of a display device according to a third exemplary embodiment of the present application.
8A to 8G are schematic cross-sectional views of a manufacturing process of a display device according to a third exemplary embodiment of the present application.
9A to 9C relate to a display device according to a fourth embodiment of the present application, which relates to a head mounted display (HMD) device.

Advantages and features of the present application and methods of achieving them will become apparent with reference to the examples described below in detail in conjunction with the accompanying drawings. However, the present application is not limited to the examples disclosed below, but will be implemented in various different forms, and only these examples allow the disclosure of the present application to be complete, and to those of ordinary skill in the art to which the present application belongs It is provided to fully indicate the scope of the invention, and the present application is only defined by the scope of the claims.

The shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining the example of the present application are exemplary, and thus the present application is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present application, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present application, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in the present application are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is interpreted as including an error range even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between the two parts unless 'directly' is used.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present application.

In describing the components of the present application, terms such as first and second may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When a component is described as being “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It will be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

Each feature of the various examples of the present application may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each example may be implemented independently of each other or may be implemented together in a related relationship .

Hereinafter, an example of a display device according to the present application will be described in detail with reference to the accompanying drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings.

FIG. 1 is a schematic plan view of a display device according to an example of the present application, FIG. 2 is a schematic cross-sectional view taken along line I-I shown in FIG. 1 , and FIG. 3 is a schematic enlarged view of part A of FIG. 2 . .

1 to 3 , a display device 1 according to an example of the present application includes a substrate 2 , a circuit element layer 3 , a first electrode 4 , a bank 5 , and an organic light emitting layer 6 . ), a light path changing structure 7 , a second electrode 8 , and an encapsulation layer 9 .

The substrate 2 may be a plastic film, a glass substrate, or a semiconductor substrate such as silicon. Since the display device 1 according to an example of the present application is a bottom emission type, the substrate 2 may be made of a transparent material.

A first sub-pixel 21 , a second sub-pixel 22 , and a third sub-pixel 23 are provided on the substrate 2 . The second sub-pixel 22 according to an example may be disposed adjacent to one side of the first sub-pixel 21 . The third sub-pixel 23 according to an example may be disposed adjacent to one side of the second sub-pixel 22 . Accordingly, the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 may be sequentially disposed on the substrate 2 .

The first sub-pixel 21 emits red (R) light, the second sub-pixel 22 emits green (G) light, and the third sub-pixel 23 emits blue (B) light. It may be provided to emit light, but is not limited thereto, and may emit light of various colors including white. Also, the arrangement order of each of the sub-pixels 21 , 22 , and 23 may be variously changed.

The circuit element layer 3 is provided on one surface of the substrate 2 .

In the circuit element layer 3 , circuit elements including a plurality of thin film transistors 31 , 32 , 33 , various signal lines, and capacitors are provided for each sub-pixel 21 , 22 , and 23 . The signal wirings may include a gate line, a data line, a power supply line, and a reference line, and the thin film transistors 31 , 32 and 33 may include a switching thin film transistor, a driving thin film transistor, and a sensing thin film transistor. have. The sub-pixels 21 , 22 , and 23 may be defined by an intersecting structure of gate lines, reference voltage lines, power supply lines, and data lines.

The switching thin film transistor is switched according to a gate signal supplied to the gate line and serves to supply a data voltage supplied from the data line to the driving thin film transistor.

The driving thin film transistor is switched according to the data voltage supplied from the switching thin film transistor to generate a data current from the power supplied from the power line and supply it to the first electrode 4 .

The sensing thin film transistor serves to sense a threshold voltage deviation of the driving thin film transistor that causes image quality deterioration, and the current of the driving thin film transistor in response to a sensing control signal supplied from the gate line or a separate sensing line is supplied to the reference line.

The capacitor serves to maintain the data voltage supplied to the driving thin film transistor for one frame, and is respectively connected to a gate terminal and a source terminal of the driving thin film transistor.

The first transistor 31 , the second transistor 32 , and the third transistor 33 are disposed in the circuit element layer 3 for individual sub-pixels 21 , 22 , and 23 .

The first electrode 4 includes a first sub-electrode 41 disposed in the first sub-pixel 21 , a second sub-electrode 42 disposed in the second sub-pixel 22 , and a third sub-pixel ( 23 ) may include a third sub-electrode 43 .

The first transistor 31 according to an example may be connected to the first sub-electrode 41 to apply a driving voltage for emitting light of a color corresponding to the first sub-pixel 21 .

The second transistor 32 according to an example may be connected to the second sub-electrode 42 to apply a driving voltage for emitting light of a color corresponding to the second sub-pixel 22 .

The third transistor 33 according to an example may be connected to the third sub-electrode 43 to apply a driving voltage for emitting light of a color corresponding to the third sub-pixel 23 .

Each of the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 according to an example receives a gate signal from a gate line using respective transistors 31 , 32 , and 33 . In this case, a predetermined current is supplied to the organic light emitting layer according to the data voltage of the data line. Accordingly, the organic light emitting layer of each of the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 may emit light with a predetermined brightness according to a predetermined current.

The first electrode 4 may be formed on the circuit element layer 3 . The first electrode 4 may be formed of a transparent material such as ITO. The first electrode 4 may be an anode.

The first sub-electrode 41 may be provided in the first sub-pixel 21 . The first sub-electrode 41 may be disposed on the circuit element layer 3 . The first sub-electrode 41 is connected to the source electrode of the first transistor 31 through a contact hole formed in a portion of the circuit element layer 3 .

The second sub-electrode 42 may be provided in the second sub-pixel 22 . The second sub-electrode 42 may be disposed on the circuit element layer 3 . The second sub-electrode 42 is connected to the source electrode of the second transistor 32 through a contact hole formed in a portion of the circuit element layer 3 .

The third sub-electrode 43 may be provided in the third sub-pixel 23 . The third sub-electrode 43 may be disposed on the circuit element square 3 . The third sub-electrode 43 is connected to the source electrode of the third transistor 33 through a contact hole formed in a portion of the circuit element layer 3 .

Here, the first to third transistors 31 , 32 , and 33 may be N-type TFTs.

If the first to third transistors 31 , 32 , and 33 are provided as P-type TFTs, each of the first to third sub-electrodes 41 , 42 , 43 may include the first to third It may be connected to the drain electrode of each of the transistors 31 , 32 , and 33 .

That is, each of the first to third sub-electrodes 41 , 42 , and 43 may be connected to a source electrode or a drain electrode according to the type of the first to third transistors 31 , 32 , and 33 .

The display device 1 according to the exemplary embodiment of the present application may be formed in a bottom emission type, and the first to third sub-electrodes 41 , 42 , 43 may be formed of a transparent electrode formed of a transparent conductive material. In addition, since the display device 1 according to the exemplary embodiment of the present application is a bottom emission type, the second electrode 8 disposed above the organic emission layer 6 may be formed of a reflective electrode. This is because, when the second electrode 8 is formed as a reflective electrode, among the light emitted from the organic light emitting layer 6 , the light having an upper optical path can be reflected toward the substrate 2 , that is, in the lower direction.

Referring again to FIG. 2 , the bank 5 is for dividing the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 . The bank 5 according to an example is provided to cover the ends of the first electrode 4 , and thus the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 . can be distinguished. The bank 5 serves to define a sub-pixel, that is, a light emitting unit. In addition, since the region where the bank 5 is formed does not emit light, it may be defined as a non-emission portion. The bank 5 may be made of any one of acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin. An organic light emitting layer 6 is formed on the first electrode 4 and the bank 5 .

Referring to FIG. 2 , the bank 5 may include a first bank 51 and a second bank 52 . The first bank 51 is provided between the first sub-pixel 21 and the second sub-pixel 22 . The first bank 51 may include an upper surface 511 and an inclined surface. The inclined surface may include a first inclined surface and a second inclined surface.

The upper surface 511 of the first bank 51 is a surface positioned above the first bank 51 .

The first inclined surface of the first bank 51 is a surface extending from the upper surface 511 to the upper surface of the first sub-electrode 41 . Accordingly, the first inclined surface of the first bank 51 and the upper surface of the first sub-electrode 41 may form a predetermined angle. The predetermined angle may be 50° or more and less than 90° because the width of the bank becomes narrow as the display device is implemented with high resolution. The width of the bank may become narrower as an interval between sub-pixels becomes narrower.

The second inclined surface of the first bank 51 is a surface extending from the upper surface 511 of the first bank 51 to the upper surface of the second sub-electrode 42 . Accordingly, the second inclined surface of the first bank 51 and the upper surface of the second sub-electrode 42 may form a predetermined angle. The angle formed between the second inclined surface of the first bank 51 and the upper surface of the second sub-electrode 42 is the first inclined surface of the first bank 51 and the upper surface of the first sub-electrode 41 . It may be the same as the angle formed by this.

Referring to FIG. 2 , the second bank 52 is provided between the second sub-pixel 22 and the third sub-pixel 23 . The second bank 52 may include an upper surface 521 and an inclined surface. The inclined surface may include a first inclined surface and a second inclined surface.

The upper surface 521 of the second bank 52 is a surface positioned above the second bank 52 .

The first inclined surface of the second bank 52 is a surface extending from the upper surface 521 of the second bank 52 to the upper surface of the second sub-electrode 42 . Accordingly, the first inclined surface of the second bank 52 and the upper surface of the second sub-electrode 42 may form a predetermined angle. The predetermined angle may be 50° or more and less than 90° because the width of the bank becomes narrow as the display device is implemented with high resolution.

The second inclined surface of the second bank 52 is a surface extending from the upper surface 521 to the upper surface of the third sub-electrode 43 . Accordingly, the second inclined surface of the second bank 52 and the upper surface of the third sub-electrode 43 may form a predetermined angle. An angle between the second inclined surface of the second bank 52 and the upper surface of the third sub-electrode 43 is an angle between the first inclined surface of the second bank 52 and the upper surface of the second sub-electrode 42 . It may be the same as the angle formed by this.

The organic light-emitting layer 6 is disposed on the first electrode 4 . A part of the organic light emitting layer 6 may also be disposed on the bank 5 . The organic light emitting layer 6 according to an example may include a hole transporting layer (HTL), a light emitting layer (EML), and an electron transporting layer (ETL). The hole transport layer HTL, the light emitting layer EML, and the electron transport layer ETL may be sequentially stacked on the first electrode 4 . Although not shown, the organic light emitting layer 6 may further include a hole blocking layer (HBL) between the light emitting layer (HTL) and the electron transport layer (ETL). The organic light emitting layer 6 includes a hole injecting layer (HIL) between the first electrode 4 and the hole transport layer (HTL), and an electron injecting layer (EIL) on the electron transport layer (ETL). may further include.

The hole injection layer (HIL), the hole transport layer (HTL), the electron transport layer (ETL) and the electron injection layer (EIL) of the organic light emitting layer 6 are to improve the luminous efficiency of the light emitting layer (EML), the hole transport layer (HTL) ) and the electron transport layer (ETL) are for balancing electrons and holes, and the hole injection layer (HIL) and the electron injection layer (EIL) are for strengthening the injection of electrons and holes.

More specifically, the hole injection layer (HIL) may facilitate hole injection by lowering an injection energy barrier of holes injected from the anode material. The hole transport layer (HTL) serves to transport holes injected from the anode to the light emitting layer without loss.

The light emitting layer (EML) is a layer that emits light through recombination of holes injected from the anode and electrons injected from the cathode, and can emit red, blue, and green light according to the binding energy in the light emitting layer, and includes a plurality of light emitting layers. It is also possible to form a white light emitting layer. The hole blocking layer (HBL) is provided between the light emitting layer (EML) and the electron transport layer (ETL) to suppress the movement of holes in the light emitting layer (EML) that do not combine with electrons. The electron blocking layer (EBL) is provided between the light emitting layer (EML) and the hole transport layer (HTL) so as to prevent electrons from moving from the light emitting layer (EML) to the hole transport layer (HTL) It serves to confine electrons in the light emitting layer (EML). .

The electron transport layer (ETL) serves to transport electrons injected from the cathode to the emission layer. The electron injection layer (EIL) serves to facilitate injection of electrons from the cathode by lowering a potential barrier during electron injection.

When a high potential voltage is applied to the first electrode 4 and a low potential voltage is applied to the second electrode 8, holes and electrons move to the light emitting layer through the hole transport layer and the electron transport layer, respectively, and combine with each other in the light emitting layer to emit light do.

In the display device 1 according to an example of the present application, the organic emission layer 6 may include a first organic emission layer 61 , a second organic emission layer 62 , and a third organic emission layer 63 . . Each of the first organic emission layer 61 , the second organic emission layer 62 , and the third organic emission layer 63 is a first sub-pixel 21 , a second sub-pixel 22 , and a third sub-pixel 23 , and the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 may form one pixel. Here, one pixel may mean a pixel capable of realizing white light by combining red light, green light, and blue light, but is not limited thereto.

Each of the first to third organic light emitting layers 61, 62, 63 may include a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer as described above. , The display device 1 according to an embodiment of the present application will be described as an example in which the organic light emitting layer 6 is provided as a hole transport layer (HTL), a light emitting layer (EML), and an electron transport layer (ETL).

If the second electrode 8 and the encapsulation layer 9 are described before the first to third organic light emitting layers 61, 62, and 63 are described in detail, the second electrode 8 is the organic light emitting layer 6 ) is placed on Since the second electrode 8 is disposed on the organic light emitting layer 6 , it may be disposed along the profile of the uppermost layer of the organic light emitting layer 6 . The second electrode 8 according to an example is a common layer commonly formed in the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 . Since the display device 1 according to an example of the present application is a bottom emission type, as described above, the second electrode 8 may include a reflective material capable of reflecting light.

An encapsulation layer 9 may be formed on the second electrode 8 . The encapsulation layer 9 serves to prevent penetration of oxygen or moisture into the organic light emitting layer 6 and the second electrode 8 . To this end, the encapsulation layer 9 may include at least one inorganic layer and at least one organic layer.

For example, the encapsulation layer 9 may include a first inorganic layer, an organic layer, and a second inorganic layer. In this case, the first inorganic film is formed to cover the second electrode 8 . The organic layer is formed to cover the first inorganic layer. The organic layer is preferably formed with a length sufficient to prevent particles from penetrating the first inorganic layer and being input to the organic light emitting layer 6 and the second electrode 8 . The second inorganic film is formed to cover the organic film.

Referring back to FIG. 2 , the first organic light emitting layer 61 may be disposed on the first sub-electrode 41 . The first organic emission layer 61 may be formed on the first sub-electrode 41 after the first electrode 4 , the first bank 51 , and the second bank 52 are formed.

As shown in FIG. 2 , the first organic emission layer 61 may include a first hole transport layer 611 , a first emission layer 612 , and a first electron transport layer 613 . The first hole transport layer 611 , the first emission layer 612 , and the first electron transport layer 613 may be sequentially stacked in the first sub-pixel 21 . In the display device 1 according to the exemplary embodiment of the present application, since the first light emitting layer 612 is provided to emit red light, the color filter can be omitted, thereby reducing the overall number of processes compared to the case where the color filter is provided. thickness can be reduced.

Meanwhile, in the display device 1 according to an example of the present application, the first hole transport layer 611 and the first light emitting layer 612 are provided only in the first sub-pixel 21 , while the first electron transport layer 613 may be provided as a common layer over the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 . Accordingly, the display device 1 according to an example of the present application may be provided to reduce the number of processes compared to a case in which an electron transport layer is provided for each sub-pixel 21 , 22 , and 23 .

As the first electron transport layer 613 of the first organic light emitting layer 61 is disposed as a common layer, as shown in FIG. 2 , the first electron transport layer 613 includes the first bank 51 and the second bank 52 . ) may cover the light path changing structures 7 respectively disposed on the .

The second organic emission layer 62 may include a second hole transport layer 621 , a second emission layer 622 , and a second electron transport layer. As described above, since the first electron transport layer 613 of the first organic light emitting layer 61 is provided as a common layer, the second electron transport layer of the second organic light emitting layer 62 is the first of the first organic light emitting layer 61 . It may be an electron transport layer 613 . The second hole transport layer 621 , the second emission layer 622 , and the second electron transport layer may be sequentially stacked in the second sub-pixel 22 . In the display device 1 according to the exemplary embodiment of the present application, since the second light emitting layer 622 is provided to emit green light, the color filter can be omitted, thereby reducing the overall number of processes compared to the case where the color filter is provided. thickness can be reduced. Meanwhile, in the display device 1 according to an example of the present application, the second hole transport layer 621 and the second light emitting layer 622 may be provided only in the second sub-pixel 22 .

The third organic emission layer 63 may include a third hole transport layer 631 , a third emission layer 632 , and a third electron transport layer. As described above, since the first electron transport layer 613 of the first organic emission layer 61 is provided as a common layer, the third electron transport layer of the third organic emission layer 63 is the first of the first organic emission layer 61 . It may be an electron transport layer 613 . The third hole transport layer 631 , the third emission layer 632 , and the third electron transport layer may be sequentially stacked in the third sub-pixel 23 . In the display device 1 according to the exemplary embodiment of the present application, since the third light emitting layer 632 is provided to emit blue light, the color filter can be omitted, thereby reducing the overall number of processes compared to the case where the color filter is provided. thickness can be reduced. Meanwhile, in the display device 1 according to an example of the present application, the third hole transport layer 631 and the third emission layer 632 may be provided only in the third sub-pixel 23 .

The light path changing structure 7 may be disposed on the bank 5 . The light path changing structure 7 may change the path of the light by totally reflecting or refracting the light emitted from the organic light emitting layer 6 . Examples of the display device 1 according to the present application may be classified according to the height of the light path changing structure 7 and the structure of the organic light emitting layer 6 . Hereinafter, a case in which the light path changing structure 7 totally reflects the light emitted from the organic light emitting layer 6 will be described as an example.

Referring to FIG. 2 , in the display device 1 according to an example of the present application, the light path changing structure 7 is provided in a reverse tapered shape and is in contact with at least a portion of the organic light emitting layer 6 , thereby forming the organic light emitting layer 6 . ), a portion of the light emitted from the light may be totally reflected toward the lower side, that is, the substrate 2 . For example, the side surface 73 of the light path changing structure 7 may be in contact with at least a portion of the organic light emitting layer 6 , so that some of the light emitted from the organic light emitting layer 6 may be totally reflected toward the substrate 2 . Some of the light emitted from the organic light emitting layer 6 may refer to light in which a light path is formed by the light path changing structure 7 among the light emitted from the organic light emitting layer 6 . The side surface 73 of the light path changing structure 7 is a surface connecting the upper surface 71 and the lower surface 72 with reference to FIG. 2 , and the upper surface 511 of the first bank 51 or the second bank ( 52) may mean a surface that is inclined with respect to the upper surface 521.

In the display device 1 of FIG. 2 , the side surface 73 of the light path changing structure 7 is in contact with the hole transport layer and the light emitting layer of the organic light emitting layer 6 . More specifically, in the display device 1 according to FIG. 2 , in the light path changing structure 7 disposed on the top surface 511 of the first bank 51 , the left side disposed on the left side of the side surfaces 73 is the second. The first hole transport layer 611 and the first light emitting layer 612 of the first organic light emitting layer 61 are in contact with the right side surface disposed on the right side is the second hole transport layer 621 and the second light emitting layer of the second organic light emitting layer 62 . 622 may be contacted. Accordingly, the light path changing structure 7 disposed on the upper surface 511 of the first bank 51 transmits the red light emitted from the first emission layer 612 when the first sub-pixel 21 emits light. The green light emitted from the second emission layer 622 may be totally reflected toward the center of the second sub-pixel 22 when light is emitted from the second sub-pixel 22 .

In addition, the light path changing structure 7 disposed on the upper surface 521 of the second bank 52 has a left side disposed on the left side among both side surfaces 73 of the second hole transport layer ( 621 ) and the second emission layer 622 , and a right side disposed on the right side may contact the third hole transport layer 631 and the third emission layer 632 of the third organic emission layer 63 . Accordingly, the light path changing structure 7 disposed on the upper surface 521 of the second bank 52 transmits the green light emitted from the second emission layer 622 when the second sub-pixel 22 emits a second light. The blue light emitted from the third emission layer 632 may be totally reflected toward the center of the third sub-pixel 22 when light is emitted from the third sub-pixel 23 .

The light path changing structure 7 is provided to have a smaller refractive index than that of the organic light emitting layer 6 , so that some of the light emitted from the organic light emitting layer 6 may be totally reflected downward. That is, the light path changing structure 7 may be formed of a low refractive index material that is smaller than the refractive index of the organic light emitting layer 6 .

For example, when the refractive index of the organic light emitting layer 6 is 1.8, the light path changing structure 7 may be provided to have a refractive index of any one of 1.3 to 1.6. The refractive index of the light path changing structure 7 may vary depending on a material constituting the light path changing structure 7 . For example, the light path changing structure 7 is an Acryl-based having a refractive index of 1.5 or less, a Fluoro Carbon-based having a refractive index of 1.3 to 1.4, a SiloXane-based having a refractive index of 1.4 to 1.5dml, and a Cyclo Alken-based having a refractive index of 1.5 to 1.6. Any one or at least two or more may be provided as a mixed material.

Accordingly, in the display device 1 according to an example of the present application, the light path changing structure 7 is provided to have a smaller refractive index than that of the organic light emitting layer 6, so that each sub-pixel 21, 22, 23), since the light directed toward the adjacent sub-pixel can be totally reflected toward the emitting sub-pixel, the light efficiency of the emitting sub-pixel can be improved.

In FIG. 2 , the light path changing structure 7 is formed in an inverted trapezoid shape as an example, but it is not limited thereto, and if some of the light emitted from the organic light emitting layer 6 can be totally reflected downward, it is provided in another shape such as an inverted triangle. could be

The upper surface 71 of the light path changing structure 7 is a surface located relatively upper in the light path changing structure 7 , and the lower surface 72 is a surface located lower than the upper surface 71 of the light path changing structure 7 . The lower surface 72 may contact the upper surface 511 of the first bank 51 or the upper surface 521 of the second bank 52 .

In the display device 1 according to an example of the present application, the length of the lower surface 72 may be shorter than the length of the upper surface 71 . That is, the light path changing structure 7 may be provided in a reverse tapered shape as shown in FIG. 2 . Since the display device 1 according to an example of the present application is a bottom light emitting type, the light emitted from the organic light emitting layer 6 disposed above the substrate 2 must be provided with the light path changing structure 7 in a reverse tapered shape. This is because it can be totally reflected toward the substrate 2 .

Meanwhile, the side surface 73 of the light path changing structure 7 and the upper surface 511 of the first bank 51 may form a first angle θ1, and as the first angle θ1 is changed, The path of the light may vary accordingly. Similarly, the side surface 73 of the light path changing structure 7 and the upper surface 521 of the second bank 52 may also form a first angle θ1 .

The first angle θ1 according to an example may be 0° or more and 90° or less, but preferably 30° or more and 60° or less. When the first angle θ1 is less than 30°, the first electrode 4 that is not covered by the first bank 51, that is, the light emitting area, is formed because the side surface 73 of the light path changing structure 7 is too flat. can be covered When the first angle θ1 is greater than 60°, it is difficult to totally reflect the light emitted from the organic light emitting layer 6 toward the sub-pixel emitting light because the side 73 of the light path changing structure 7 is too erect. Accordingly, in the display device 1 according to an example of the present application, the first angle θ1 formed between the side surface 73 of the light path changing structure 7 and the upper surface 511 of the first bank 51 is By being provided at 30° or more and 60° or less, it is possible to increase the reflection efficiency of the organic light-emitting layer 6 without blocking the light-emitting region, thereby improving the light efficiency.

Referring to FIG. 3 , in the display device 1 according to an example of the present application, the width W1 of the upper surface 71 of the light path changing structure 7 is the upper surface 511 of the first bank 51 . ) may be provided equal to or smaller than the width W2.

If the width W1 of the upper surface 71 of the light path changing structure 7 is greater than the width W2 of the upper surface 511 of the first bank 51 , the light path changing structure 7 is formed with the second This is because the transmittance of light reflected from the electrode 8 and directed toward the substrate 2 may be lowered, so that the light efficiency may be lowered. In addition, when the width W1 of the upper surface 71 of the light path changing structure 7 is greater than the width W2 of the upper surface 511 of the first bank 51 , the width of the organic light emitting layer 6 is relatively small. Because of the narrowing, the light efficiency may be lowered.

Accordingly, in the display device 1 according to an example of the present application, the width W1 of the upper surface 71 of the optical path changing structure 7 provided in the reverse tapered shape is the upper surface 511 of the first bank 51 . By being provided equal to or smaller than the width W2 of the light emitting layer 6, the width of the organic light emitting layer 6 is prevented from being narrowed and the transmittance of the light reflected from the second electrode 8 and directed toward the substrate 2 may not be reduced. efficiency can be improved. This can be equally applied to the width W1 of the upper surface 71 of the light path changing structure 7 and the width W1 of the upper surface 521 of the second bank 52 .

Referring back to FIG. 2 , in the display device 1 according to an example of the present application, as the first electron transport layer 613 of the first organic light emitting layer 61 is disposed as a common layer, the first electron transport layer 613 is The light path changing structures 7 respectively disposed on the first bank 51 and the second bank 52 may be covered. That is, the upper surface 71 of the light path changing structure 7 may contact the lower surface of the first electron transport layer 613 . In addition, the lower surface 72 of the light path changing structure 7 may contact the upper surface 511 of the first bank 51 or the upper surface 521 of the second bank 52 .

In addition, as the first electron transport layer 613 of the first organic light emitting layer 61 is disposed as a common layer, the second electrode 8 disposed on the upper surface of the first electron transport layer 613 is formed in the first to third sub-layers. The pixels 21 , 22 , and 23 may be connected to each other without being disconnected. Accordingly, the display device 1 according to an example of the present application may stably apply a common voltage to the first to third sub-pixels 21 , 22 , and 23 through the second electrode 8 .

4A to 4Q are schematic cross-sectional views of a manufacturing process of a display device according to an example of the present application. The display device 1 according to an example of the present application may be manufactured through the manufacturing process of FIGS. 4A to 4Q .

First, referring to FIGS. 4A to 4E , in a state in which the first electrode 4 , the first bank 51 , and the second bank 52 are formed on the substrate 2 and the circuit element layer 3 , After depositing the first hole transport layer 611 and the first emission layer 612 as a common layer over the first to third sub-pixels 21, 22, and 23, the shield layer SL and the PR layer are sequentially coated, , after positioning the mask M on the area of the first organic light emitting layer 61, the PR layer of the remaining area is exposed. Accordingly, in the PR layer, properties of the remaining regions except for the region of the first organic light emitting layer 61 may be changed to be etched by the developer. The region of the first organic light emitting layer 61 is a first hole transport layer 611 of the first organic light emitting layer 61 only on the upper surface of the first sub electrode 41 and on the bank defining the first sub pixel 21 . and a region for forming the first emission layer 612 , which may be equal to or greater than the width of the first sub-electrode 41 . In addition, an area of the first organic light emitting layer 61 may be provided to be smaller than a width of the first sub-pixel 21 . Since the width of the area of the first organic light emitting layer 61 is smaller than the width of the first sub-pixel 21, a light path change structure (between the area of the first organic light emitting layer 61 and the area of the second organic light emitting layer 62 to be described later) 7) can be arranged in a space. The first emission layer 612 may emit red (R) light, but is not limited thereto.

Next, referring to FIG. 4F , a primary removal process of removing the PR layer in the remaining area except for the area of the first organic light emitting layer 61 using a developer is performed. The PR layer removed by the developer may be corroded and removed by being immersed in the developer. At this time, the PR layer left on the region of the first organic light emitting layer 61 has both sides so that the lower surface of the PR layer is larger than the upper surface as shown in FIG. 4f as the developer etches the PR layer sequentially from top to bottom. It may be formed to be inclined.

Next, referring to FIG. 4G, the first hole transport layer 611 and the first light emitting layer 612 of the remaining area including the PR layer on the first organic light emitting layer 61 area using a dry etching process. A secondary removal process of removing the shield layer SL is performed. The dry etching process may be a process of etching the first hole transport layer 611 , the first light emitting layer 612 , and the shield layer SL in the remaining regions including the PR layer with an etchant. Through this process, the first hole transport layer 611 and the first light emitting layer 612 of the first organic light emitting layer 61 only on the upper surface of the first sub electrode 41 and the bank defining the first sub pixel 21 . ) and the shield layer SL remain, and the first hole transport layer 611 of the first organic light emitting layer 61 , the first light emitting layer 612 , and the shield layer SL may be removed from the remaining area. For example, the remaining region is a region excluding some of the top surface of the first sub-electrode 41 , the side surface of the bank defining the first sub-pixel 21 , and the top surface of the bank, and is the top surface of the first bank 51 . A portion may be an area including the right side of the first bank 51 , the second sub-pixel 22 , the second bank 52 , and the third sub-pixel 23 .

Meanwhile, in the process of FIG. 4G, as shown in FIG. 4G, as the etchant etches the shield layer SL, the first light emitting layer 612, and the first hole transport layer 611 sequentially from top to bottom, as shown in FIG. 4G Likewise, both sides of the shield layer SL, the first light emitting layer 612 , and the first hole transport layer 611 may be formed to be inclined.

Next, referring to FIG. 4H , the first hole transport layer 611 and the first light emitting layer 612 sequentially stacked on the upper surface of the first sub electrode 41 and the bank defining the first sub pixel 21 . A second hole transport layer 621 , a second light emitting layer 622 , a shield layer SL, and a PR layer are sequentially deposited over the entire surface of the shield layer SL and the remaining regions.

Next, as shown in FIG. 4I , a mask M is placed on the area of the second organic light emitting layer 62 and the remaining PR layer is exposed. Accordingly, in the PR layer except for the area of the second organic light emitting layer 62, the remaining area may be etched by the developer so that the characteristics thereof may be changed. The second hole transport layer 621 of the second organic light emitting layer 62 is formed only on the upper surface of the second sub-electrode 42 and the bank defining the second sub-pixel 22 in the area of the second organic light emitting layer 62 . and a region for forming the second light emitting layer 622 , which may be equal to or greater than the width of the second sub-electrode 42 . In addition, the area of the second organic light emitting layer 62 may be provided to be smaller than the width of the second sub-pixel 22 . The second emission layer 622 may emit green (G) light, but is not limited thereto.

Next, referring to FIG. 4J , a third removal process of removing the PR layer in the remaining area except for the area of the second organic light emitting layer 62 using a developer is performed. The PR layer removed by the developer may be corroded and removed by being immersed in the developer. At this time, the PR layer left on the region of the second organic light emitting layer 62 has both sides so that the lower surface of the PR layer is larger than the upper surface as shown in FIG. 4j as the developer etches the PR layer sequentially from top to bottom. It may be formed to be inclined.

Next, referring to FIG. 4K , the second hole transport layer 621 and the second light emitting layer 622 of the remaining area including the PR layer on the second organic light emitting layer 62 area are formed by using a dry etching process. A fourth removal process is performed to remove it. The dry etching process may be a process of etching the second hole transport layer 621 , the second light emitting layer 622 , and the shield layer SL in the remaining regions including the PR layer with an etchant. Through this process, the second hole transport layer 621 and the second light emitting layer 622 of the second organic light emitting layer 62 only on the upper surface of the second sub electrode 42 and the bank defining the second sub pixel 22 . ), and the shield layer SL remain, and the second hole transport layer 621 , the second light emitting layer 622 of the second organic light emitting layer 62 , and the shield layer SL of the second organic light emitting layer 62 may be removed from the remaining area. For example, the remaining regions include the first sub-pixel 21 , a portion of the top surface of the first bank 51 , a portion of the top surface of the second bank 52 , the right surface of the second bank 52 , and the third sub-pixel 23 . ) may be included.

Meanwhile, in the process of FIG. 4K, as shown in FIG. 4K, as the etchant etches the shield layer SL, the second light emitting layer 622, and the second hole transport layer 621 sequentially from top to bottom, as shown in FIG. 4K Similarly, both sides of the shield layer SL, the second light emitting layer 622 and the second hole transport layer 621 may be formed to be inclined.

In addition, since the PR layer is disposed on the area of the second organic light emitting layer 62 , the height of the shield layer SL left in the second sub-pixel 22 is equal to the height of the shield layer SL disposed in the first sub-pixel 21 . may be higher than the height of

Next, referring to FIG. 4L , the first hole transport layer 611 and the first light emitting layer 612 are sequentially stacked on the upper surface of the first sub electrode 41 and the bank defining the first sub pixel 21 . and a shield layer SL, a second hole transport layer 621 and a second light emitting layer 622 sequentially stacked on the bank defining the upper surface of the second sub-electrode 42 and the second sub-pixel 22; A third hole transport layer 631 , a third light emitting layer 632 , a shield layer SL, and a PR layer are sequentially deposited all over the shield layer SL and the remaining regions.

Next, as shown in FIG. 4M , the mask M is placed on the area of the third organic light emitting layer 63 and the remaining PR layer is exposed. Accordingly, in the PR layer except for the area of the third organic light emitting layer 63, the characteristics may be changed so as to be etched by the developer. The third hole transport layer 631 of the third organic light emitting layer 63 is formed only on the upper surface of the third sub-electrode 43 and the bank defining the third sub-pixel 23 in the area of the third organic light emitting layer 63 . A region for forming the third light emitting layer 632 and the third light emitting layer 632 may be equal to or greater than the width of the third sub electrode 43 . In addition, the area of the third organic light emitting layer 63 may be provided to be smaller than the width of the third sub-pixel 23 . The third emission layer 632 may emit blue (B) light, but is not limited thereto.

Next, referring to FIG. 4N , a fifth removal process of removing the PR layer in the remaining area except for the area of the third organic light emitting layer 63 using a developer is performed. The PR layer removed by the developer may be corroded and removed by being immersed in the developer. At this time, the PR layer left on the region of the third organic light emitting layer 63 has both sides so that the lower surface of the PR layer is larger than the upper surface as shown in FIG. 4n as the developer etches the PR layer sequentially from top to bottom. It may be formed to be inclined.

Next, referring to FIG. 4O, using a dry etching process, the third hole transport layer 631 and the third light emitting layer 632 of the remaining area including the PR layer on the third organic light emitting layer 63 area are formed. Perform the 6th removal process to remove. The dry etching process may be a process of etching the third hole transport layer 631 , the third light emitting layer 632 , and the shield layer SL in the remaining regions including the PR layer with an etchant. Through this process, the third hole transport layer 631 and the third light emitting layer 632 of the third organic light emitting layer 63 only on the upper surface of the third sub electrode 43 and the bank defining the third sub pixel 23 . ), and the shield layer SL remain, and the third hole transport layer 631 , the third light emitting layer 632 , and the shield layer SL of the third organic light emitting layer 63 may be removed from the remaining area. For example, the remaining area may be an area excluding a portion of the top surface of the bank defining the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 .

Meanwhile, in the process of FIG. 4o, as shown in FIG. 4o, as the etchant etches the shield layer SL, the third light emitting layer 632, and the third hole transport layer 631 sequentially from top to bottom, as shown in FIG. Similarly, both sides of the shield layer SL, the third light emitting layer 632 , and the third hole transport layer 631 may be formed to be inclined.

In addition, since the PR layer is disposed on the third organic emission layer 63 , the height of the shield layer SL left in the third sub-pixel 23 is the shield layer SL disposed in the first sub-pixel 21 . may be higher than the height of the shield layer SL disposed on the second sub-pixel 22 . Here, the height of the shield layer SL disposed on the second sub-pixel 22 may be higher than the height of the shield layer SL disposed on the first sub-pixel 21 . This is because the shield layer SL disposed on the first sub-pixel 21 undergoes three etching processes, whereas the shield layer SL disposed on the second sub-pixel 22 undergoes only two etching processes.

In addition, although not shown, a stripping process is performed to remove all of the shield layer SL remaining in each of the first to third sub-pixels 21 , 22 , and 23 . Accordingly, as shown in FIG. 4P , the first light emitting layer 612 , the second light emitting layer 622 , and the third light emitting layer 632 are formed by the first sub-pixel 21 , the second sub-pixel 22 , and Each of the third sub-pixels 23 may be exposed at the uppermost side. In addition, a space may be formed on the upper surface of each of the banks 5 to become narrower toward the substrate 2 .

Next, referring to FIG. 4P , a material 7 ′ forming the light path changing structure 7 is injected into the space formed on each bank 5 by using the injection device IJ. The injection device IJ may be a device capable of injecting a liquid. The material 7 ′ forming the light path changing structure 7 may be any one of an acryl-based, a fluorocarbon-based, a siloXane-based, and a cyclo-alkene-based liquid, or a mixture of at least two or more.

After filling the space with the material 7 ′ forming the light path changing structure 7 , a baking process is performed to form the light path changing structure 7 . In this case, the baking process may be performed using either a thermal curing process or a light curing process. The thermal curing process and the photo curing process may be performed over the entire surface of the first to third sub-pixels 21 , 22 , and 23 .

The thermal curing process is a process of curing the material 7' forming the optical path changing structure 7 using heat, and the optical path changing structure 7 is heated at a temperature of 100 degrees or less for about 10 to 20 minutes. It can be carried out by exposing the material 7' forming the Since the light emitting layers located on both sides of the material 7' forming the light path changing structure 7 may be damaged by heat at a temperature exceeding 100 degrees, the thermal curing process may be performed at a temperature of 100 degrees or less. have.

The photo-curing process is a process of curing the material 7' forming the optical path change structure 7 using light such as UV, and after pre-baking at a temperature of 90 degrees or less for about 2 minutes, 200 mJ to 600 mJ This can be done by exposing the material 7' forming the light path changing structure 7 to light, with a light intensity of 6 to 15 seconds. Even in this case, at a light intensity exceeding 600 mJ, the light-emitting layers located on both sides of the material 7 ′ forming the light path changing structure 7 may be damaged by heat, so that the light curing process is performed at a light intensity of 600 mJ or less. can be performed.

When the baking process as described above is completed, as shown in FIG. 4q , the light path changing structure 7 may have the same height as the upper surface 71 of the light emitting layer without a step difference. In addition, the lower surface 72 may be in contact with the upper surface of each bank 5 , and the side surface 73 may be in contact with the hole transport layer and the light emitting layer.

Next, referring to FIG. 4Q , the first electrons cover the upper surface 71 of the light path changing structure 7 and the first to third light emitting layers 612 , 622 , and 632 that are flatly arranged to have the same height. The transport layer 613 , the second electrode 8 , and the encapsulation layer 9 are sequentially deposited over the entire surface. Accordingly, a part of the manufacturing process for the display device 1 according to an example of the present application may be completed.

5 is a schematic cross-sectional view of a display device according to a second exemplary embodiment of the present application.

Referring to FIG. 5 , in the display device 1 according to the second exemplary embodiment of the present application, the height of the light path changing structure 7 is higher, so that the side surface 73 of the light path changing structure 7 is formed in first to second positions. 3, except that the first electron transport layer 613, the second electron transport layer 623, and the third electron transport layer 633 each of the organic light emitting layers 61, 62, 63 each have, except for further contacting, in FIG. It is the same as the following display device. Accordingly, the same reference numerals are assigned to the same components, and only different components will be described below.

In the case of the display device according to FIG. 2 described above, a light path changing structure (for total reflection of the light emitted from the first light emitting layer 612 , the second light emitting layer 622 , and the third light emitting layer 632 toward the substrate 2 ) The side surface 73 of 7) is provided so as to contact only the hole transport layer and the light emitting layer of each organic light emitting layer 6 . This is because, if the side surface 73 of the light path changing structure 7 does not contact the light emitting layer, light emitted from the light emitting layer may be interfered with adjacent sub-pixels. Accordingly, in the case of the display device of FIG. 2 , the first electron transport layer 613 may be provided as a common layer so that the upper surface 71 of the light path changing structure 7 is in contact with the lower surface of the first electron transport layer 613 . provided as much as possible. In addition, the lower surface 72 of the light path changing structure 7 is provided to be in contact with the upper surface of the bank 5 .

In contrast, in the case of the display device according to the second embodiment of FIG. 5 , the height of the light path changing structure 7 is higher, so that the side surface 73 of the light path changing structure 7 is formed with each organic light emitting layer 6 . It is provided so as to be in contact with the hole transport layer, the light emitting layer, and the electron transport layer having. Therefore, in the case of the display device according to FIG. 5 , the lower surface 72 of the light path changing structure 7 is in contact with the upper surface of the bank 5 , and the upper surface 71 is in contact with the lower surface of the second electrode 8 . can be provided.

As a result, the light path changing structure 7 of the display device 1 according to the second exemplary embodiment of FIG. 5 is formed between the entire plurality of layers included in each of the first organic light emitting layer 61 and the second organic light emitting layer 62 . , and the second organic light emitting layer 62 and the third organic light emitting layer 63 are disposed between the entire plurality of layers, respectively, the first organic light emitting layer 61 and the second organic light emitting layer 62 and the third organic light emitting layer (63) may also have a function of completely disconnecting. Accordingly, in the display device 1 according to the second exemplary embodiment of the present application, the light path changing structure 7 is disposed between the first to third organic light emitting layers 61 , 62 , and 63 , so that the first to second 3 Among the light emitted from the light emitting layers 612 , 622 , and 632 , the light reflected by the second electrode 8 is not incident on the upper surface 71 of the light path changing structure 7 , but the side surface of the light path changing structure 7 . Since total reflection can be made toward the substrate 2 through 73 , the light efficiency can be further improved compared to the display device of FIG. 2 .

Meanwhile, in the display device according to FIG. 2 , the first electron transport layer 613 is provided as a common layer, but in the display device according to the second embodiment of FIG. 5 , the first electron transport layer 613 is not provided as a common layer, and the first electron transport layer 613 is not provided as a common layer. It is disposed only in one sub-pixel 21 . Accordingly, in the second organic light emitting layer 62 , the second electron transport layer 623 is provided on the upper surface of the second light emitting layer 622 , and the third organic light emitting layer 63 is formed on the upper surface of the third light emitting layer 632 . A transport layer 633 may be provided.

The first electron transport layer 613 is laminated on the upper surface of the first light emitting layer 612 and then patterned together with the first hole transport layer 611 and the first light emitting layer 612 to be disposed only in the first sub-pixel 21 . can The second electron transport layer 623 is laminated on the upper surface of the second light emitting layer 622 and then patterned together with the second hole transport layer 621 and the second light emitting layer 622 to be disposed only in the second sub-pixel 22 . can The third electron transport layer 633 is laminated on the upper surface of the third light emitting layer 632 and then patterned together with the third hole transport layer 631 and the third light emitting layer 632 to be disposed only in the third sub-pixel 23 . can

Accordingly, in the display device 1 according to the second exemplary embodiment of the present application, the light path changing structure 7 disposed on the first bank 51 includes the first hole transport layer ( 611), the first emission layer 612 and the first electron transport layer 613, and between the second hole transport layer 611 and the second emission layer 622 and the second electron transport layer 623 of the second organic emission layer 62 By baking after filling the space formed in the space formed with the solution material forming the light path changing structure 7, the left side of the side surface 73 is the first hole transport layer 611, the first light emitting layer 612, and the first electron transport layer ( 613 , the right side may be provided in a reverse tapered shape in contact with the second hole transport layer 611 , the second light emitting layer 622 , and the second electron transport layer 623 . In addition, the upper surface 71 of the light path changing structure 7 may contact the lower surface of the second electrode 8 , and the lower surface 72 may contact the upper surface of the bank 5 .

In addition, the light path changing structure 7 disposed on the second bank 52 includes a second hole transport layer 621 , a second light emitting layer 622 , and a second electron transport layer 623 of the second organic light emitting layer 62 . , and a solution material for forming a light path changing structure 7 in the space formed between the third hole transport layer 631 and the third light emitting layer 632 and the third electron transport layer 633 of the third organic light emitting layer 63 . By baking after filling, the left side of the side surface 73 is in contact with the second hole transport layer 621 , the second light emitting layer 622 , and the second electron transport layer 623 , and the right side is the third hole transport layer 631 and the second hole transport layer 631 . The third light emitting layer 632 and the third electron transport layer 633 may be provided in a reverse-tapered shape. In addition, the upper surface 71 of the light path changing structure 7 may contact the lower surface of the second electrode 8 , and the lower surface 72 may contact the upper surface of the bank 5 .

6 is a graph comparing the front luminance of the display device of FIGS. 1 and 5 and the conventional display device.

Referring to FIG. 6 , L is a graph showing the front luminance of a conventional display device without a light path changing structure, L1 is a graph showing the front luminance of the display device according to the example of FIG. 2 , and L2 is a graph of FIG. 5 . It is a graph showing the front luminance of the display device according to the second embodiment. Here, the horizontal axis represents a viewing angle, and the vertical axis represents luminance intensity.

As shown in FIG. 6 , L has a luminance of about 7.5 in a front direction with a viewing angle of 0, L1 has a luminance of about 9.5 in a front direction with a viewing angle of 0, and L2 has a luminance of about 7.5 in a front direction with a viewing angle of 0. It can be seen that 10 This may mean that when the light path changing structure is present, the light having the light path formed on the side is reflected toward the center of the sub-pixel, so that the light efficiency is improved and the front luminance is increased. In addition, the light path changing structure 7 does not contact only a portion of each of the first organic light emitting layer 61 , the second organic light emitting layer 62 , and the third organic light emitting layer 63 , but the first organic light emitting layer 61 , the second When all of the second organic light-emitting layer 62 and the third organic light-emitting layer 63 are in contact with each other, light efficiency is further improved, which may mean that the front luminance is higher. This is because the larger the area of the side surface 73 of the light path changing structure 7 is, the greater the amount of light reflected.

As a result, in the display device 1 according to the second embodiment of the present application, since the side surface 73 of the light path changing structure 7 is in contact with the hole transport layer, the light emitting layer, and the electron transport layer of the organic light emitting layer 6 , the light path The side 73 of the modified structure 7 may be provided to further improve light efficiency compared to the display device according to an example of the present application in which only the hole transport layer and the light emitting layer of the organic light emitting layer 6 are in contact.

7 is a schematic cross-sectional view of a display device according to a third exemplary embodiment of the present application.

Referring to FIG. 7 , in the display device 1 according to the third exemplary embodiment of the present application, the organic light emitting layer 6 is provided to emit white light, and a first sub-pixel 21 and a second sub-pixel 22 are provided. It is the same as the display device of FIG. 5 , except that the color filter 10 is provided to correspond to each of , , and the third sub-pixel 23 . Accordingly, the same reference numerals are assigned to the same components, and only different components will be described below.

In the case of the above-described display device according to FIG. 5 , the side surface 73 of the light path changing structure 7 is in contact with the hole transport layer, the light emitting layer, and the electron transport layer each of the first to third organic light emitting layers 61 , 62 and 63 have. provided as much as possible. Accordingly, in the case of the display device of FIG. 5 , the first hole transport layer 611 , the first emission layer 612 , and the first electron transport layer 613 of the first organic emission layer 61 include the first sub-pixel 21 . patterned so as to be disposed only in the second organic light emitting layer 62, and the second hole transport layer 621, the second light emitting layer 622, and the second electron transport layer 623 of the second organic light emitting layer 62 are patterned to be disposed only in the second sub-pixel 22, , the third hole transport layer 631 , the third emission layer 632 , and the third electron transport layer 633 of the third organic emission layer 63 are patterned to be disposed only in the third sub-pixel 23 , and then the first to second 3 The light path changing structure 7 is formed by filling the space formed between the organic light emitting layers 61 , 62 , and 63 with a material forming the light path changing structure 7 .

That is, in the display device of FIG. 5 , the light path changing structure 7 is formed after the process of patterning the first organic light emitting layer 61 , the second organic light emitting layer 62 , and the third organic light emitting layer 63 is performed, respectively. do.

In contrast, in the case of the display device according to the third exemplary embodiment of FIG. 7 , the organic light emitting layer 6 ′ is provided in a two-stack structure to emit white light and the first to third sub-pixels 21 , 22 , and 23 . ) by being provided as a common layer, the organic light emitting layer 6 ′ having the same structure without needing to separate the first organic light emitting layer 61 , the second organic light emitting layer 62 and the third organic light emitting layer 63 is the first sub It may be disposed in the pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 .

More specifically, in the display device 1 according to the third exemplary embodiment of FIG. 7 , the organic light emitting layer 6 ′ includes a first electron transport layer 611 ′, a first light emitting layer 612 ′, and a first electron transport layer 613 ′. ) including a first stack 61 ′, a charge generation layer 62 ′ disposed on an upper surface of the first stack 61 ′, and a second stack 63 disposed on an upper surface of the charge generation layer 62 ′. ') may be included. The second stack 63 ′ may include a second hole transport layer 631 ′, a second emission layer 632 ′, and a second electron transport layer 633 ′.

The charge generation layer 62' serves to supply charges to the first stack 61' and the second stack 63'. The charge generation layer 62' includes an N-type charge generation layer for supplying electrons to the first stack 61' and P for supplying holes to the second stack 63'. It may include a type charge generation layer. The N-type charge generation layer may include a metal material as a dopant.

The first light-emitting layer 612' may be provided to emit yellow-green (YG) light, and the second light-emitting layer 632' may be provided to emit blue (B) light. Accordingly, the organic light emitting layer 6 ′ of the display device 1 according to the third exemplary embodiment of the present application may be provided to emit white light in which yellow-green (YG) light and blue (B) light are combined.

Therefore, in the display device 1 according to the third embodiment of the present application, the side surface 73 of the light path changing structure 7 is the first electron transport layer 611 ′, the first light emitting layer 612 ′, and the second light path changing structure 7 . The first electron transport layer 613 ′, the charge generation layer 62 ′, the second hole transport layer 631 ′, the second light emitting layer 632 ′, and the second electron transport layer 633 ′ may be in contact. In the case of the display device according to FIG. 2 , the left side and the right side of the light path changing structure 7 were in contact with different organic light emitting layers, but in the display device 1 according to FIG. 7 , the left side of the light path changing structure 7 . The side 73 may be in contact with the same organic light emitting layer without distinction between the right side and the right side.

On the other hand, in the display device 1 according to the third embodiment of the present application, the light path changing structure 7 is disposed on the top surface of the plurality of banks 5 as shown in FIG. 7 to form the charge generation layer 62 . ') may be cut off for each of the first to third sub-pixels 21 , 22 , and 23 . Accordingly, since the display device 1 according to the third exemplary embodiment of the present application can prevent a lateral leakage current from occurring between adjacent sub-pixels, it is possible to prevent two sub-pixels from emitting light at the same time to prevent color mixing. .

Referring back to FIG. 7 , in the display device 1 according to the third embodiment of the present application, since the organic light emitting layer 6 ′ is provided to emit white light, a color filter ( 10) may be provided. In addition, since the display device 1 according to the third exemplary embodiment of the present application is a bottom emission type, the color filter 10 may be disposed below the first electrode 4 . For example, the color filter 10 may be provided in the circuit element layer 3 as shown in FIG. 7 .

The color filter 10 is provided in each of the first to third sub-pixels 21, 22, and 23 so that only light of a specific color is transmitted from the light emitted from the organic light-emitting layer 6' of each sub-pixel. This is to block the light. The color filter 10 may include a first color filter 101 , a second color filter 102 , and a third color filter 103 .

The first color filter 101 may be provided to correspond to the first sub-pixel 21 . The first color filter 101 may be provided to block light of colors other than red (R) light. In this case, the first color filter 101 may be provided as a red color filter.

The second color filter 102 may be provided to correspond to the second sub-pixel 22 . The second color filter 102 may be provided to block light of colors other than green (G) light. In this case, the second color filter 102 may be provided as a green color filter.

The third color filter 103 may be provided to correspond to the third sub-pixel 23 . The third color filter 103 may be provided to block light of colors other than blue (B) light. In this case, the third color filter 103 may be provided as a blue color filter.

Accordingly, in the display device 1 according to the third exemplary embodiment of the present application, the organic light emitting layer 6 ′ emits white light, but each sub-pixel 21 through the first to third color filters 101 , 102 , 103 . , 22, 23) may be provided to emit red (R) light, green (G) light, and blue (B) light.

On the other hand, in the display device 1 according to the third embodiment of the present application, as shown in FIG. 7 , the bank 5 in which the edge of the first color filter 101 is disposed above the first color filter 101 . ) may be provided to overlap (OA). For example, the first color filter 101 may be provided to be the same as the first sub-electrode 41 or to be longer than the first sub-electrode 41 , so that the edge thereof may overlap the bank 5 OA.

If the first color filter is shorter than the first sub-electrode so that the edge of the first color filter does not overlap the bank, the white light emitted from the first sub-pixel 21 is emitted to the outside without passing through the first color filter. can be emitted. In this case, since white light, not red light, is partially emitted, the red light can be seen relatively softly.

Accordingly, in the display device 1 according to the third exemplary embodiment of the present application, the edge of the first color filter 101 overlaps (OA) on the bank 5 , thereby emitting light from the first sub-pixel 21 . Since white light may pass through all of the first color filter 101 , it may be provided to prevent the red light from appearing softly.

For the same reason as described above, in the display device 1 according to the third exemplary embodiment of the present application, the edge of the second color filter 102 overlaps the bank 5 , so that light is emitted from the second sub-pixel 22 . Since one white light may pass through all of the second color filters 102 , it may be provided to prevent the green light from appearing softly.

In addition, in the display device 1 according to the third exemplary embodiment of the present application, the edge of the third color filter 103 overlaps the bank 5 , so that the white light emitted from the third sub-pixel 23 is emitted. Since all of the third color filters 103 may pass through, the blue light may be provided to prevent the blue light from appearing softly.

8A to 8G are schematic cross-sectional views of a manufacturing process of a display device according to a third exemplary embodiment of the present application. The display device 1 according to the third exemplary embodiment of the present application may be manufactured through the manufacturing process of FIGS. 8A to 8G .

First, referring to FIGS. 8A and 8B , the first to third color filters 101 , 102 , and 103 are formed in the circuit element layer 3 disposed on the substrate 2 to include the sub-pixels 21 , 22 and 23 . The first electron transport layer 611 ′ and the first light emitting layer are arranged separately and in a state in which the first electrode 4 , the first bank 51 , and the second bank 52 are formed on the circuit element layer 3 . 612', a first electron transport layer 613', a charge generation layer 62', a second hole transport layer 631', a second light emitting layer 632', a second electron transport layer 633', a shield layer (SL), and PR layers are sequentially deposited over the entire surface.

Next, referring to FIG. 8C , the PR layer of the remaining area after the mask M is positioned on the first sub-pixel 21 area, the second sub-pixel 22 area, and the third sub-pixel 23 area to expose Accordingly, in the PR layer, characteristics of the remaining regions except for the first sub-pixel 21 region, the second sub-pixel 22 region, and the third sub-pixel 23 region may be changed to be etched by the developer.

The first sub-pixel 21 region is a region for forming the organic light emitting layer 6 ′ only on the upper surface of the first sub-electrode 41 and on the banks defining the first sub-pixel 21 , The width of one sub-electrode 41 may be equal to or greater than that of the sub-electrode 41 . In addition, the area of the first sub-pixel 21 may be provided to be smaller than the width of the first sub-pixel 21 . Since the width of the first sub-pixel 21 is smaller than the width of the first sub-pixel 21, a light path changing structure ( 7) can be arranged in a space.

The second sub-pixel 22 region is a region for forming the organic light emitting layer 6 ′ only on the upper surface of the second sub-electrode 42 and on the banks defining the second sub-pixel 22 , The width of the second sub-electrode 42 may be equal to or greater than that of the sub-electrode 42 . Also, as described above, the area of the second sub-pixel 22 may be smaller than the width of the second sub-pixel 22 .

The third organic light emitting layer 63 is a region for forming the organic light emitting layer 6 ′ only on the upper surface of the third sub electrode 43 and on the banks defining the third sub pixel 23 . 3 The width of the sub-electrode 43 may be equal to or greater than that of the sub-electrode 43 . In addition, the area of the third sub-pixel 23 may be provided to be smaller than the width of the third sub-pixel 23 . This is to dispose the light path changing structure 7 between the area of the second sub-pixel 22 and the area of the third sub-pixel 23 .

Next, referring to FIG. 8D , the PR layer of the remaining areas excluding the first sub-pixel 21 area, the second sub-pixel 22 area, and the third sub-pixel 23 area is removed using a developer. Carry out the tea removal process. The PR layer removed by the developer may be corroded and removed by being immersed in the developer. At this time, the PR layer remaining on the first sub-pixel 21 area, the second sub-pixel 22 area, and the third sub-pixel 23 area is formed by the developer sequentially etching the PR layer from top to bottom. As shown in Figure 8d, both sides of the PR layer may be formed to be inclined so that the lower surface is larger than the upper surface.

Next, referring to FIG. 8E , a dry etching process is used to include a PR layer on the first sub-pixel 21 region, the second sub-pixel 22 region, and the third sub-pixel 23 region. A secondary removal process of removing the organic light emitting layer 6 ′ and the shielding layer SL of the remaining area is performed. The dry etching process may be a process of etching the organic light emitting layer 6 ′ and the shield layer SL in the remaining regions including the PR layer with an etchant. Through this process, the organic light emitting layer 6 ′ and the shield layer SL are formed on the upper surface of the first sub-electrode 41 , the bank defining the first sub-pixel 21 , and the upper surface of the second sub-electrode 42 . It may remain on the bank defining the second sub-pixel 22 and the bank defining the top surface of the third sub-electrode 43 and the third sub-pixel 23 . In addition, the organic light emitting layer 6 ′ and the shielding layer SL may be removed from the remaining area. Here, the remaining area may be a portion of the top surface of each of the plurality of banks 5 .

Meanwhile, in the process of FIG. 8e, as shown in FIG. 8d, as the etchant sequentially etches the shield layer SL and the organic light emitting layer 6' from top to bottom, as shown in FIG. 8e, the shield layer SL and Both sides of the organic light emitting layer 6 ′ may be formed to be inclined.

In addition, since the shield layer SL is simultaneously etched in the process of FIG. 8E , the shield layer SL may have the same height unlike the display device of FIG. 5 .

Next, although not shown, a stripping process is performed to remove all of the shield layers SL remaining in each of the first to third sub-pixels 21 , 22 , and 23 . Accordingly, as shown in FIG. 8F , the second electron transport layer 632 ′ is exposed at the uppermost side of each of the first sub-pixel 21 , the second sub-pixel 22 , and the third sub-pixel 23 . can In addition, a space may be formed on the upper surface of each of the banks 5 to become narrower toward the substrate 2 .

Next, referring to FIG. 8F , the material 7 ′ forming the optical path changing structure 7 is injected into the space formed on each bank 5 by using the implantation device IJ. The injection device IJ may be a device capable of injecting a liquid. The material 7 ′ forming the light path changing structure 7 may be any one of an acryl-based, a fluorocarbon-based, a siloXane-based, and a cyclo-alkene-based liquid, or a mixture of at least two or more.

After filling the space with the material 7 ′ forming the light path changing structure 7 , a baking process is performed to form the light path changing structure 7 . In this case, the baking process may be performed using either a thermosetting process or a photocuring process, as described above. The thermal curing process and the photo curing process may be performed over the entire surface of the first to third sub-pixels 21 , 22 , and 23 .

When the baking process as described above is completed, the light path changing structure 7 may have the same height as the upper surface 71 of the second electron transport layer 633 ′ without a step difference, as shown in FIG. 8G . . And, the lower surface 72 is in contact with the upper surface of each bank 5, and the side surface 73 is a first electron transport layer 611 ′, a first light emitting layer 612 ′, a first electron transport layer 613 ′, and an electric charge. The generation layer 62 ′, the second hole transport layer 631 ′, the second light emitting layer 632 ′, and the second electron transport layer 633 ′ may be in contact.

Next, referring to FIG. 8G , the second electrode 8 and the encapsulation cover the upper surface 71 of the light path changing structure 7 and the upper surface of the second electron transport layer 633 ′, which are flatly arranged to have the same height. Layer 9 is sequentially deposited over the entire surface. Accordingly, a part of the manufacturing process for the display device 1 according to the third exemplary embodiment of the present application may be completed.

In the display device 1 according to the third embodiment of the present application, since the organic light emitting layer 6 ′ is provided as a common layer, the first organic light emitting layer 61 for each of the first to third sub-pixels 21 , 22 , and 23 . , the second organic light emitting layer 62, and the third organic light emitting layer 63 can be significantly reduced compared to the case of patterning, so the number of times the light emitting layer is exposed to etchant or air is significantly reduced, so that the service life of the organic light emitting layer is longer It may be provided to increase.

On the other hand, in the display device 1 according to the third embodiment of the present application, the side surface 73 of the light path changing structure 7 is a first electron transport layer 611 ′, a first light emitting layer 612 ′, and a first electron It has been described that the transport layer 613 ′, the charge generation layer 62 ′, the second hole transport layer 631 ′, the second light emitting layer 632 ′, and the second electron transport layer 633 ′ are in contact, but another implementation For example, the side surface 73 of the light path changing structure 7 may include a first electron transport layer 611 ′, a first light emitting layer 612 ′, a first electron transport layer 613 ′, a charge generation layer 62 ′, It may be provided to contact only the second hole transport layer 631 ′ and the second light emitting layer 632 ′.

That is, the display device 1 according to the fourth embodiment of the present application may be provided such that the side surface 73 of the light path changing structure 7 does not contact the second electron transport layer 633 ′. Accordingly, the lower surface 72 of the light path changing structure 7 may be in contact with the upper surface of the bank, and the upper surface 71 of the light path changing structure 7 may be in contact with the lower surface of the second electron transport layer 633 ′. have.

Therefore, in the display device 1 according to the fourth embodiment of the present application, since the second electron transport layer 633 ′ and the second electrode 8 may be provided as a common layer, the display device 1 according to the third embodiment of the present application It may be provided structurally differently from the display device.

Meanwhile, in the display device 1 according to the fourth embodiment of the present application, since the charge generation layer 62 ′ is cut off by the optical path change structure 7 , it is possible to prevent lateral leakage current from occurring between adjacent sub-pixels. Therefore, it is possible to prevent the two sub-pixels from emitting light at the same time to prevent color mixing.

In addition, in the display device 1 according to the fourth embodiment of the present application, since the first light emitting layer 612 ′ and the second light emitting layer 632 ′ are cut off by the light path changing structure 7 , each sub-pixel When light is emitted, light emitted from the first light emitting layer 612 ′ and the second light emitting layer 632 ′ can be reflected on the side surface of the light path change structure 7 to emit light only toward the sub-pixels that emit light, so that the first light emitting layer ( 612') and the second light emitting layer 632', that is, the overall light emitting efficiency of the sub-pixel that emits light may be improved.

In summary, in the display device according to an example of the present application, the side surface 73 of the light path changing structure 7 is in contact with the hole transport layer and the light emitting layer of each organic light emitting layer 61 , 62 , 63 , and the light path changing structure The upper surface 71 of (7) may be in contact with the lower surface of the first electron transport layer 613, and the lower surface 72 of the light path changing structure 7 may be provided in contact with the upper surface of the bank.

Accordingly, in the display device according to an example of the present application, when each of the first light-emitting layer 612 , the second light-emitting layer 622 , and the third light-emitting layer 623 emits light, the light path changing structure 7 among the light emitted from the light-emitting layer Since the light directed toward may be totally reflected toward the substrate 2 through the side surface 73 of the light path changing structure 7 , the luminous efficiency may be improved.

Next, in the display device according to the second embodiment of the present application, the side surface 73 of the light path changing structure 7 is in contact with the hole transport layer, the light emitting layer, and the electron transport layer of each organic light emitting layer 61 , 62 , 63 , The upper surface 71 of the path changing structure 7 may be in contact with the lower surface of the second electrode 8 , and the lower surface 72 of the light path changing structure 7 may be provided in contact with the upper surface of the bank.

Accordingly, in the display device according to the second embodiment of the present application, the light path changing structure 7 includes the first organic light emitting layer 61 , the second organic light emitting layer 62 , and the third organic light emitting layer 63 . can be completely cut off.

Accordingly, in the display device according to the second exemplary embodiment of the present application, the light reflected on the lower surface of the second electrode 8 among the light emitted from the first to third light emitting layers 612 , 622 , and 632 is transmitted to the light path changing structure ( 7), since it is not incident on the upper surface 71 and can be totally reflected toward the substrate 2 through the side surface 73 of the light path changing structure 7, the light efficiency can be further improved compared to the display device according to an example. .

Next, in the display device according to the third exemplary embodiment of the present application, the organic light emitting layer 6 ′ is provided in a two-stack structure to emit white light and is common across the first to third sub-pixels 21 , 22 , and 23 . It is provided as a layer, and the side surface 73 of the light path changing structure 7 is a first electron transport layer 611 ′, a first light emitting layer 612 ′, a first electron transport layer 613 ′, and a charge generation layer 62 ′. ), the second hole transport layer 631 ′, the second light emitting layer 632 ′, and the second electron transport layer 633 ′, and the upper surface 71 of the light path changing structure 7 is the second electrode 8 ), and the lower surface 72 of the light path changing structure 7 may be provided in contact with the upper surface of the bank. Accordingly, in the display device according to the third exemplary embodiment of the present application, both side surfaces 73 of the light path changing structure 7 may contact the organic light emitting layer having the same structure.

Accordingly, in the display device according to the third exemplary embodiment of the present application, the light path changing structure 7 can completely cut off the organic light emitting layer 6 ′ having a two-stack structure disposed in each of the sub-pixels 21 , 22 and 23 . Therefore, the charge generation layer 62 ′ can be disconnected for each sub-pixel 21 , 22 , and 23 , thereby preventing a lateral leakage current from occurring between adjacent sub-pixels.

In addition, in the display device according to the third exemplary embodiment of the present application, among the light emitted from the first light emitting layer and the second light emitting layer disposed in each of the sub-pixels 21 , 22 and 23 , the light reflected on the lower surface of the second electrode 8 Since the light is not incident on the upper surface 71 of the light path changing structure 7 and can be totally reflected toward the substrate 2 through the side surface 73 of the light path changing structure 7, it is possible to improve the luminous efficiency of each sub-pixel. can

Next, in the display device according to the fourth embodiment of the present application, the side surface 73 of the light path changing structure 7 is a first electron transport layer 611 ′, a first light emitting layer 612 ′, and a first electron transport layer 613 . '), the charge generating layer 62', the second hole transport layer 631', and the second light emitting layer 632', but not in contact with the second electron transport layer 633'. Accordingly, the lower surface of the light path changing structure 7 may be in contact with the upper surface of the bank, and the upper surface of the light path changing structure 7 may be in contact with the lower surface of the second electron transport layer 633 ′. It may be provided structurally differently from the display device according to the third embodiment.

In the display device 1 according to the fourth embodiment of the present application, the upper surface 71 of the light path changing structure 7 is in contact with the lower surface of the second electron transport layer 633', so the second electrode 8 may be spaced apart from the lower surface by a predetermined distance. Accordingly, some of the light emitted from the first light emitting layer 612 ′ and the second light emitting layer 632 ′ is reflected on the lower surface of the second electrode 8 to damage the upper surface 71 of the light path changing structure 7 . can be entered through

In the display device 1 according to the fourth embodiment of the present application, since the charge generation layer 62 ′ is cut off by the optical path change structure 7 , it is possible to prevent a lateral leakage current from occurring between adjacent sub-pixels, and , since the first light emitting layer 612 ′ and the second light emitting layer 632 ′ are cut off by the light path changing structure 7 , when light is emitted from each sub-pixel, the first light emitting layer 612 ′ and the second light emitting layer 632 ′ ) so that the light emitted from the light path changing structure 7 is totally reflected on the side surface of the light path changing structure 7 and emitted toward the emitting sub pixel, thereby improving the overall luminous efficiency of the emitting sub pixel.

9A to 9C relate to a display device according to a fourth embodiment of the present application, which relates to a head mounted display (HMD) device. 9A is a schematic perspective view, FIG. 9B is a schematic plan view of a VR (Virtual Reality) structure, and FIG. 9C is a schematic cross-sectional view of an AR (Augmented Reality) structure.

As can be seen from FIG. 9A , the head mounted display device according to the present invention includes a storage case 11 and a head mounted band 13 .

The storage case 11 houses a display device, a lens array, and an eyepiece lens therein.

The head mounting band 13 is fixed to the storage case 11 . The head mounting band 13 has been illustrated as being formed to surround the upper surface and both sides of the user's head, but is not limited thereto. The head mounting band 13 is for fixing the head mounted display to the user's head, and may be replaced with a structure in the form of an eyeglass frame or a helmet.

As can be seen from FIG. 9B , the head mounted display device 1 having a VR (Virtual Reality) structure according to the present application includes a left-eye display device 2a and a right-eye display device 2b, a lens array 12, and a left eye. It may include an eyepiece 20a and a right eyepiece 20b.

The left eye display device 2a and the right eye display device 2b, the lens array 12, and the left eyepiece 20a and the right eyepiece 20b are accommodated in the storage case 11 described above. .

The left-eye display device 2a and the right-eye display device 2b may display the same image, and in this case, the user may view the 2D image. Alternatively, the left-eye display device 2a may display a left-eye image and the right-eye display device 2b may display a right-eye image. In this case, the user may view a stereoscopic image. Each of the left-eye display device 2a and the right-eye display device 2b may include the display device illustrated in FIGS. 1 to 7 . For example, each of the left-eye display device 2a and the right-eye display device 2b may be an organic light emitting display.

Each of the left-eye display device 2a and the right-eye display device 2b includes a plurality of sub-pixels, a circuit element window 3 , a first electrode 4 , a bank 5 , an organic light emitting layer 6 , and an optical path. It may include a modification structure 7 , a second electrode 8 , and an encapsulation layer 9 , and various images may be displayed by combining colors of light emitted from each sub-pixel area in various ways. In addition, each of the left-eye display device 2a and the right-eye display device 2b may further include a color filter 10 .

The lens array 12 may be provided between the left eyepiece 20a and the left eye display device 2a while being spaced apart from each of the left eyepiece 20a and the left eye display device 2a. That is, the lens array 12 may be located in front of the left eyepiece lens 20a and behind the left eye display device 2a. In addition, the lens array 12 may be provided between the right eyepiece 20b and the right eye display device 2b while being spaced apart from each of the right eyepiece 20b and the right eye display device 2b. have. That is, the lens array 12 may be located in front of the right eye eyepiece 20b and behind the right eye display device 2b.

The lens array 12 may be a micro lens array. The lens array 12 may be replaced with a pin hole array. Due to the lens array 12 , the image displayed on the left-eye display device 2a or the right-eye display device 2b may be enlarged to the user.

The user's left eye LE may be located in the left eyepiece 20a, and the user's right eye RE may be located in the right eyepiece 20b.

As can be seen from FIG. 9c , the head mounted display device having an AR (Augmented Reality) structure according to the present invention includes a left eye display device 2a, a lens array 12, a left eye eyepiece 20a, and a transmission reflector 14. , and a transmission window 15 . 9C shows only the left eye configuration for convenience, and the right eye configuration is also the same as the left eye configuration.

The left eye display device 2a, the lens array 12, the left eye eyepiece 20a, the transmissive reflector 14, and the transmissive window 15 are accommodated in the above-described storage case 11 .

The left-eye display device 2a may be disposed on one side, for example, an upper side, of the transmissive reflector 14 without blocking the transmissive window 15 . Accordingly, the left-eye display device 2a may provide an image to the transmissive reflector 14 without blocking the external background viewed through the transmissive window 15 .

The left-eye display device 2a may include the display device according to FIGS. 1 to 7 described above. At this time, an upper portion corresponding to the surface on which an image is displayed in FIGS. 1 to 7 , for example, the encapsulation layer 9 or the color filter layer 10 faces the transmission/reflection unit 14 .

The lens array 12 may be provided between the left eyepiece 20a and the transmissive reflector 13 .

The user's left eye is located in the left eye eyepiece 20a.

The transmissive reflector 14 is disposed between the lens array 12 and the transmissive window 15 . The transmissive reflector 14 may include a reflective surface 14a that transmits a portion of the light and reflects the other portion of the light. The reflective surface 14a is formed so that the image displayed on the left-eye display device 2a proceeds to the lens array 12 . Accordingly, the user can see both the external background and the image displayed by the left-eye display device 2a through the transmission layer 14 . That is, since a user can view a single image by overlapping a real background and a virtual image, augmented reality (AR) can be implemented.

The transmission layer 14 is disposed in front of the transmission reflection unit 14 .

The present application described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which this application belongs that various substitutions, modifications and changes are possible within the scope without departing from the technical spirit of the present application. It will be clear to those who have the knowledge of Therefore, the scope of the present application is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present application.

1: display device
2: substrate 3: circuit element layer
4: first electrode 5: bank
6: organic light emitting layer 7: light path change structure
8: second electrode 9: encapsulation layer
10: color filter 11: storage case
12: lens array 13: head mounting band

Claims (18)

a substrate including a first sub-pixel and a second sub-pixel;
a first electrode disposed on each of the first sub-pixel and the second sub-pixel;
an organic light emitting layer disposed on the first electrode;
a bank provided between the first sub-pixel and the second sub-pixel while covering an end of the first electrode; and
a light path changing structure disposed on the bank;
The light path changing structure is in contact with at least a portion of the organic light emitting layer. The method of claim 1,
The light path changing structure is provided in a reverse tapered shape. The method of claim 1,
A refractive index of the light path changing structure is smaller than a refractive index of the organic light emitting layer. The method of claim 1,
a second electrode disposed on the organic light emitting layer;
The first electrode is provided as a transparent electrode,
The second electrode is a reflective electrode. The method of claim 1,
The light path changing structure includes an upper surface, a lower surface, and a side surface connecting the upper surface and the lower surface,
A length of the lower surface is shorter than a length of the upper surface. 6. The method of claim 5,
The bank includes an upper surface,
The width of the upper surface of the light path changing structure is equal to or smaller than the width of the upper surface of the bank. 7. The method of claim 6,
A side surface of the light path changing structure and an upper surface of the bank form a first angle,
The first angle is 30° or more and 60° or less. The method of claim 1,
The organic light emitting layer includes a hole transport layer, a light emitting layer disposed on the upper surface of the hole transport layer, and an electron transport layer disposed on the upper surface of the light emitting layer,
A side surface of the light path changing structure is in contact with the hole transport layer and the light emitting layer. 9. The method of claim 8,
The light path changing structure has a lower surface in contact with the bank and an upper surface in contact with a lower surface of the electron transport layer. The method of claim 1,
a third sub-pixel disposed adjacent to the second sub-pixel;
The organic light-emitting layer includes a first organic light-emitting layer disposed on the first sub-pixel, a second organic light-emitting layer disposed on the second sub-pixel, and a third organic light-emitting layer disposed on the third sub-pixel,
The first organic light emitting layer is provided to emit red light,
The second organic light emitting layer is provided to emit green light,
The third organic light emitting layer is provided to emit blue light. The method of claim 1,
The organic light emitting layer includes a hole transport layer, a light emitting layer disposed on the upper surface of the hole transport layer, and an electron transport layer disposed on the upper surface of the light emitting layer,
A side surface of the light path changing structure is in contact with the hole transport layer, the light emitting layer, and the electron transport layer. 12. The method of claim 11,
a second electrode disposed on the organic light emitting layer;
The light path changing structure has a lower surface in contact with the bank and an upper surface in contact with the second electrode. The method of claim 1,
a third sub-pixel disposed adjacent to the second sub-pixel;
The organic light emitting layer is provided as a common layer over the first sub-pixel, the second sub-pixel, and the third sub-pixel. 14. The method of claim 13,
The organic light emitting layer includes a first hole transport layer, a first light emitting layer disposed on an upper surface of the first hole transport layer, a first electron transport layer disposed on an upper surface of the first light emitting layer, and a charge generating layer disposed on an upper surface of the first electron transport layer , a second hole transport layer disposed on the upper surface of the charge generating layer, a second light emitting layer disposed on the upper surface of the second hole transport layer, and a second electron transport layer disposed on the upper surface of the second light emitting layer,
The light path change structure has a side surface of the first hole transport layer, the first light emitting layer, the first electron transport layer, the charge generation layer, the second hole transport layer, the second light emitting layer, the second electron transport layer in contact with the display Device. 15. The method of claim 14,
The first light emitting layer is provided to emit yellow-green light,
The second light emitting layer is provided to emit blue light. 14. The method of claim 13,
a first color filter provided to correspond to the first sub-pixel;
a second color filter provided to correspond to the second sub-pixel; and
The display device further comprising a third color filter provided to correspond to the third sub-pixel. 17. The method of claim 16,
an edge of the first color filter is disposed to overlap the bank. 18. The method according to any one of claims 1 to 17,
A display device further comprising: a lens array spaced apart from the substrate; and a storage case accommodating the substrate and the lens array.

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