KR20220049376A - Display apparatus - Google Patents

Abstract

A display device according to an example of the present invention comprises: a substrate having a first sub-pixel, a second sub-pixel, and a third sub-pixel; a circuit element layer including a driving thin film transistor provided on the substrate; an insulating layer including a trench provided in a boundary region between the first to third sub-pixels on the circuit element layer; first electrodes respectively provided in the first to third sub-pixels to be spaced apart from the trench; an organic light emitting layer provided on the first electrode and the trench; a second electrode provided on the organic light emitting layer; and a step compensation unit formed to be wider than the trench and disposed to be in contact with the lower surface of the trench. The first electrode provided in the first sub-pixel includes a first upper electrode and a first lower electrode spaced apart from the first upper electrode toward the substrate. The first lower electrode may be provided on the same layer as the step compensation unit. Accordingly, light efficiency can be improved.

Description

display device {DISPLAY APPARATUS}

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

A display device has a structure in which a light emitting layer is formed between an anode electrode and a cathode electrode, and the light emitting layer emits light by an electric field between the two electrodes to display an image.

The light emitting layer may be made of an organic material that emits light when excitons are generated by the combination of electrons and holes, and the generated excitons fall from an excited state to a ground state, or quantum dots (Quantum dot) dot) may be composed of inorganic substances such as

The light emitting layer may be configured to emit light of different colors, eg, red, green, and blue, for each sub-pixel, or may be configured to emit light of the same color, eg, white, for each sub-pixel.

When the light-emitting layer emits light of a different color for each sub-pixel, different light-emitting layers must be deposited for each sub-pixel using a predetermined mask. In this case, there is a problem in that it is difficult to precisely deposit the emission layer for each sub-pixel.

On the other hand, when the light emitting layer emits light of the same color, eg, white, for each sub-pixel, a mask for forming the light emitting layer is not required, and thus a problem due to the mask process does not occur.

However, when the light emitting layer is configured to emit white light, since a color filter must be additionally provided for each sub-pixel, the light emitted from the light emitting layer is absorbed by the color filter, thereby reducing light efficiency.

SUMMARY OF THE INVENTION The present invention has been devised to solve the problems of the related art, and an object of the present invention is to provide a display device capable of improving light efficiency while including a light emitting layer emitting white light.

A display device according to an exemplary embodiment of the present invention includes a circuit including a substrate including a first sub-pixel, a second sub-pixel, and a third sub-pixel, and driving thin film transistors respectively provided in the first to third sub-pixels on the substrate The element layer, the insulating layer including the trench provided in the boundary region between the first to third sub-pixels on the circuit element layer, the first electrodes provided in the first to third sub-pixels respectively to be spaced apart from the trench, and the first electrode and an organic light emitting layer provided on the trench, a second electrode provided on the organic light emitting layer, and a step compensation part formed to have a width wider than the trench and disposed to contact the lower surface of the trench, and the first sub-pixel provided in the first sub-pixel The electrode may include a first upper electrode and a first lower electrode spaced apart from the first upper electrode toward the substrate, and the first lower electrode may be provided on the same layer as the step difference compensating part.

A display device according to an embodiment of the present invention includes a first sub-pixel having a first light-emitting area and a first contact area, a second sub-pixel having a second light-emitting area and a second contact area, a third light-emitting area and a second sub-pixel having a second light-emitting area and a second contact area. A third sub-pixel having three contact areas, a first lower electrode and a first upper electrode provided in the first light-emitting area, a second lower electrode and a second upper electrode provided in the second light-emitting area, and a third light-emitting area The third lower electrode and the third upper electrode are provided, the first contact electrode is provided in the first contact region and is connected to the first lower electrode and the first upper electrode, and the third lower electrode and the third upper electrode are provided in the second contact region and connected to the second upper electrode. The second contact electrode, the third contact electrode provided in the third contact region and connected to the third lower electrode, the trench provided in the boundary region between the first to third sub-pixels, and the first to third contact electrodes in contact with the lower surfaces of the trenches 3 including a step difference compensating part that is narrower than the width of each of the lower electrodes and wider than the width of the trench, the first lower electrode is provided on the same layer as the step compensating part, and the distance between the second lower electrode and the second upper electrode is the first lower electrode It may be provided to be smaller than the distance between the first upper electrode and the third lower electrode and larger than the distance between the third lower electrode and the third upper electrode.

In the display device according to the present invention, microcavity characteristics are obtained through reflection and re-reflection between the first lower electrode and the second electrode of the first sub-pixel provided on the same layer as the step difference compensator disposed in contact with the lower surface of the trench. and, accordingly, light efficiency may be improved.

In the display device according to the present invention, the step difference compensating portion provided on the same layer as the first lower electrode is formed to be wider than the trench and provided to contact the lower surface of the trench, thereby preventing the step difference from occurring around the trench. Accordingly, in the display device according to the present invention, since the trench can be formed in a normal shape, cracks such as a seam are prevented from occurring in the trench, thereby improving reliability.

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

1 is a schematic plan view of a display device according to an embodiment of the present invention.
FIG. 2A is a schematic cross-sectional view taken along line I-I' shown in FIG. 1 ;
FIG. 2B is a schematic enlarged view of part A shown in FIG. 2A.
3 is a schematic cross-sectional view taken along the line II-II' shown in FIG. 1 .
4 is a plan view schematically illustrating first to sixth sub-pixels of a display device according to an exemplary embodiment of the present invention.
5 is a schematic plan view of a display device according to another exemplary embodiment of the present invention.
FIG. 6 is a schematic cross-sectional view taken along line III-III' shown in FIG. 5 .
7 is a schematic cross-sectional view taken along line IV-IV' shown in FIG. 5 .
8A to 8C relate to a display device according to still another embodiment of the present invention, which relates to a head mounted display device (HMD).

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

The shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining an example of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. When 'includes', 'have', 'consists of', etc. mentioned in the present invention 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 construed as including an error range even if there is no separate explicit description.

In the case of a description of the 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 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 invention.

In describing the components of the present invention, terms such as first, second, etc. 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 it is described that a component is “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 should be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

Each feature of the various embodiments of the present invention can be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or implemented together in a related relationship. may be

Hereinafter, an example of a display device according to the present invention 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.

1 is a schematic plan view of a display device according to an embodiment of the present invention. 1 shows only three sub-pixels SP1, SP2, and SP3.

As can be seen from FIG. 1 , in the display device according to an embodiment of the present invention, a substrate 2 , a first electrode 5 , a first contact electrode 61 , a second contact electrode 62 , and a third contact electrode It includes a contact electrode 6 having 63 , a trench T disposed between the first to third sub-pixels SP1 , SP2 , and SP3 , a fence F, and an insulating portion IP.

A plurality of sub-pixels SP1 , SP2 , and SP3 are formed on the substrate 2 .

A plurality of light emitting areas EA1 , EA2 , EA3 and a plurality of contact areas CA1 , CA2 , CA3 are provided in the plurality of sub-pixels SP1 , SP2 , and SP3 .

Specifically, the first light-emitting area EA1 and the first contact area CA1 are provided in the first sub-pixel SP1 , and the second light-emitting area EA2 and the second contact are provided in the second sub-pixel SP2 . The area CA2 is provided, and the third light emitting area EA3 and the third contact area CA3 are provided in the third sub-pixel SP3 .

The plurality of light emitting areas EA1 , EA2 , and EA3 are defined by the fence F and the insulating part IP. That is, the exposed area without being covered by the fence F and the insulating portion IP becomes the plurality of light emitting areas EA1 , EA2 , and EA3 . The first light emitting area EA1 may be formed of a red light emitting area, the second light emitting area EA2 may be formed of a green light emitting area, and the third light emitting area EA3 may be formed of a blue light emitting area. It is not limited thereto. The fence F and the insulating part IP may be made of an insulating material.

The plurality of contact areas CA1 , CA2 , and CA3 may be provided in an area covered by the insulating part IP. According to an example, the plurality of contact areas CA1 , CA2 , and CA3 may be located at the center of one side of the plurality of sub-pixels SP1 , SP2 , and SP3 . For example, the first contact area CA1 is provided at the upper center inside the first sub-pixel SP1 , the second contact area CA2 is provided at the upper center inside the second sub-pixel SP2 , and the third A third contact area CA3 may be provided at an upper center inside the sub-pixel SP3 . Here, one side of the plurality of sub-pixels SP1, SP2, and SP3 means an upper side or a lower side of each of the sub-pixels SP1, SP2, and SP3 based on FIG. 1 , for example, not adjacent to the trench T It may mean one side of the sub-pixel.

A plurality of contact holes PCNT, CNT11, CNT12, CNT21, CNT22, CNT31, and CNT32 are formed in the plurality of contact regions CA1 , CA2 , and CA3 , thereby generating a step. Accordingly, at least a portion of the plurality of contact areas CA1 , CA2 , and CA3 is exposed without being covered by the insulating portion IP, so that at least a portion of the plurality of contact areas CA1 , CA2 , and CA3 is exposed to the plurality of light emitting areas When overlapping with (EA1, EA2, EA3), light emission may not be uniform in the light emitting areas EA1, EA2, and EA3 due to the step difference. Accordingly, in an embodiment of the present invention, the plurality of contact areas CA1, CA2, CA3 is covered with the plurality of light emitting areas ( EA1, EA2, EA3) are formed so as not to overlap. However, the present invention is not limited thereto, and at least a portion of the plurality of contact areas CA1 , CA2 , and CA3 is not covered by the insulating part IP, so that at least a portion of the plurality of contact areas CA1 , CA2 , CA3 is not covered. It is also possible to form so as to overlap the plurality of light emitting areas EA1, EA2, and EA3.

The first electrode 5 is patterned for each individual sub-pixel SP1 , SP2 , and SP3 . That is, one first electrode 51 is formed in the first sub-pixel SP1 , the other first electrode 52 is formed in the second sub-pixel SP2 , and the third sub-pixel SP2 Another first electrode 53 is formed in SP3). The first electrodes 51 , 52 , and 53 may function as an anode of the display device.

The first electrode 51 of the first sub-pixel SP1 extends from the first emission area EA1 to the first contact area CA1 and is covered by the insulating part IP and the fence F. The exposed portion of the first electrode 51 exposed without being supported becomes the first light emitting area EA1 . The first electrode 51 of the first sub-pixel SP1 is connected to the first contact electrode 61 in the first contact area CA1 .

The first electrode 52 of the second sub-pixel SP2 extends from the second emission area EA2 to the second contact area CA2 and is covered by the insulating part IP and the fence F. The exposed portion of the first electrode 52 exposed without being supported becomes the second light emitting area EA2 . The first electrode 52 of the second sub-pixel SP2 is connected to the second contact electrode 62 in the second contact area CA2 .

The first electrode 53 of the third sub-pixel SP3 extends from the third light emitting area EA3 to the third contact area CA3 and is covered by the insulating part IP and the fence F. The exposed portion of the first electrode 53 exposed without being supported becomes the third light emitting area EA3 . The first electrode 53 of the third sub-pixel SP3 is connected to the third contact electrode 63 in the third contact area CA3 .

The contact electrode 6 is provided in the contact areas CA1 , CA2 , and CA3 . Specifically, the first contact electrode 61 is provided in the first contact area CA1 , the second contact electrode 62 is provided in the second contact area CA2 , and the third contact electrode 63 is provided in the second contact area CA2 . is provided in the third contact area CA3 .

The first contact electrode 61 overlaps the first electrode 51 of the first sub-pixel SP1 in the first contact area CA1 and is connected to the first electrode 51 . In order to increase the area of the first light emitting area EA1 , the left and right widths CEW of the first contact electrode 61 (shown in FIG. 2A ) are equal to the left and right widths EW of the first electrode 51 in FIG. 2A . shown) may be provided smaller than that.

The second contact electrode 62 is connected to the first electrode 52 while overlapping the first electrode 52 of the second sub-pixel SP2 in the second contact area CA2 . In order to increase the area of the second light emitting area EA2 , the left and right widths of the second contact electrode 62 may be smaller than the left and right widths of the first electrode 52 .

The third contact electrode 63 is connected to the first electrode 53 while overlapping the first electrode 53 of the third sub-pixel SP3 in the third contact area CA3 . In order to increase the area of the third light emitting area EA3 , the left and right widths of the third contact electrode 63 may be smaller than the left and right widths of the first electrode 53 .

A left and right width of the second contact electrode 62 and a left and right width of the third contact electrode 63 may be the same as the left and right width CEW of the first contact electrode 61 , and The left and right widths of the electrode 52 and the left and right widths of the first electrode 53 may be the same as the left and right widths EW of the first electrode 51 .

Hereinafter, various embodiments of the present invention will be described in detail through a cross-sectional structure.

FIG. 2A is a schematic cross-sectional view of a display device according to an embodiment of the present invention, which corresponds to a cross-section taken along line I-I' shown in FIG. 1 , and FIG. 2B is a schematic enlargement of a portion A shown in FIG. 2A . FIG. 3 is a cross-section taken along line II-II' shown in FIG. 1 .

As can be seen from FIGS. 2A and 3 , the display device 1 according to the exemplary embodiment includes a substrate 2 , a circuit element layer 3 , a first insulating layer 41 and a second insulating layer 42 . ) having an insulating layer 4, first electrodes 51, 52, 53, contact electrodes 61, 62, 63, fence F, organic light emitting layer 7, second electrode 8, trench ( T), a step compensation part 9 , an encapsulation layer 10 , and a color filter layer 11 .

The substrate 2 may be made of glass or plastic, but is not limited thereto, and may be made of a semiconductor material such as a silicon wafer.

The substrate 2 may be made of a transparent material or an opaque material. A first sub-pixel SP1 , a second sub-pixel SP2 , and a third sub-pixel SP3 are provided on the substrate 2 . The first sub-pixel SP1 may emit red light, the second sub-pixel SP2 may emit green light, and the third sub-pixel SP3 may be provided to emit blue light. The present invention is not limited thereto, and for example, the arrangement order of each of the sub-pixels SP1 , SP2 , and SP3 may be variously changed.

The display device according to an embodiment of the present invention is formed in a so-called top emission method in which emitted light is emitted upward. can be used

The circuit element layer 3 is formed on the substrate 2 .

In the circuit element layer 3, circuit elements including various signal lines, thin film transistors, and capacitors are provided for each sub-pixel SP1, SP2, and SP3. The signal wirings may include a gate wiring, a data wiring, a power wiring, and a reference wiring, and the thin film transistor may include a switching thin film transistor, driving thin film transistors 31 , 32 , 33 , and sensing thin film transistors. there is.

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

The driving thin film transistors 31 , 32 , and 33 are 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 supply line to the first electrodes 51 , 52 , and 53 . serves to supply.

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 wiring.

The capacitor serves to maintain the data voltage supplied to the driving thin film transistors 31, 32, and 33 for one frame, and is connected to the gate terminal and the source terminal of the driving thin film transistors 31, 32, and 33, respectively. do.

A circuit contact hole PCNT is provided for each of the sub-pixels SP1, SP2, and SP3 in the circuit element layer 3, and the source of the driving thin film transistors 31, 32, and 33 is provided through the circuit contact hole PCNT. The terminal or drain terminal is exposed.

The first electrodes 51 , 52 , 53 and the contact electrodes 61 , 62 , and 63 are patterned for each sub-pixel SP1 , SP2 , and SP3 on the circuit element layer 3 . One first electrode 51 and a first contact electrode 61 are formed in the first sub-pixel SP1 , and another first electrode 52 and a second contact electrode are formed in the second sub-pixel SP2 . 62 is formed, and another first electrode 53 and a third contact electrode 63 are formed in the third sub-pixel SP3 .

The first electrodes 51 , 52 , and 53 are connected to the driving thin film transistors 31 , 32 , and 33 provided in the circuit element layer 3 . Specifically, the first electrodes 51 , 52 , and 53 are connected to a source terminal or a drain terminal of the driving thin film transistors 31 , 32 and 33 .

The first electrode 51 provided in the first sub-pixel SP1 includes a first lower electrode 511 and a first upper electrode 512 . The first lower electrode 511 and the first upper electrode 512 extend from the first emission area EA1 to the first contact area CA1.

The first lower electrode 511 is connected to the driving thin film transistor 31 through the circuit contact hole PCNT of the circuit element layer 3 provided in the first sub-pixel SP1 region. In some cases, the first lower electrode 511 may be connected to the driving thin film transistor 31 through a conductive material filled in the circuit contact hole PCNT, and this may be equally applied to all embodiments below.

The first upper electrode 512 is connected to the first upper contact electrode 612 of the first contact electrode 61 disposed on the second insulating layer 42 provided in the first sub-pixel SP1 region. there is.

The first contact electrode 61 provided in the first sub-pixel SP1 includes a first lower contact electrode 611 and a first upper contact electrode 612 . The first lower contact electrode 611 is connected to the first lower electrode 511 through the first contact hole CNT11 of the first insulating layer 41 provided in the first sub-pixel SP1 region, The first upper contact electrode 612 is connected to the first lower contact electrode 611 through the second contact hole CNT12 of the second insulating layer 42 provided in the first sub-pixel SP1 region. .

In the first sub-pixel SP1 , the first lower electrode 511 is directly connected to the driving thin film transistor 31 provided in the circuit element layer 3 , and the first upper electrode 512 is connected to the first It is connected to the first lower electrode 511 through a first lower contact electrode 611 and a first upper contact electrode 612 . Accordingly, the first lower electrode 511 may be disposed on the lower surface of the first lower contact electrode 611 . In the first emission area EA1 of the first sub-pixel SP1 , the first insulating layer 41 and the second insulating layer 42 are interposed between the first lower electrode 511 and the first upper electrode 512 . It is available.

The first electrode 52 provided in the second sub-pixel SP2 includes a second lower electrode 521 and a second upper electrode 522 . The second lower electrode 521 and the second upper electrode 522 extend from the second light emitting area EA2 to the second contact area CA2.

The second lower electrode 521 is a second lower electrode constituting the second contact electrode 62 through the first contact hole CNT21 of the first insulating layer 41 provided in the second sub-pixel SP2 region. It is connected to the contact electrode 621 . The second upper electrode 522 is connected to the second upper contact electrode 622 constituting the second contact electrode 62 disposed on the second insulating layer 42 provided in the second sub-pixel SP2 region. connected.

The second contact electrode 62 provided in the second sub-pixel SP2 includes a second lower contact electrode 621 and a second upper contact electrode 622 . The second lower contact electrode 621 is connected to the driving thin film transistor 32 through the circuit contact hole PCNT of the circuit element layer 3 provided in the second sub-pixel SP2 region, and the second The upper contact electrode 622 is connected to the second lower electrode 521 through the second contact hole CNT22 of the second insulating layer 42 provided in the second sub-pixel SP2 region. In some cases, the second lower contact electrode 621 may be connected to the driving thin film transistor 32 through a conductive material filled in the circuit contact hole PCNT, and this may be equally applied to all embodiments below. .

In the second sub-pixel SP2 , the second lower electrode 521 is connected to the driving thin film transistor 32 provided in the circuit element layer 3 through the second lower contact electrode 621 , and , the second upper electrode 522 is connected to the second lower electrode 521 through the second upper contact electrode 622 . Accordingly, the second lower electrode 521 may be disposed between the second lower contact electrode 621 and the second upper contact electrode 622 . In the second emission area EA2 of the second sub-pixel SP2 , the second insulating layer 42 is provided between the second lower electrode 521 and the second upper electrode 522 .

The first electrode 53 provided in the third sub-pixel SP3 includes a third lower electrode 531 and a third upper electrode 532 . The third lower electrode 531 and the third upper electrode 532 extend from the third light emitting area EA3 to the third contact area CA3 .

The third lower electrode 531 is a third upper portion constituting the third contact electrode 63 through the second contact hole CNT32 of the second insulating layer 42 provided in the third sub-pixel SP3 region. It is connected to the contact electrode 632 . The third upper electrode 532 is directly contacted and connected to the upper surface of the third lower electrode 531 without a contact hole.

The third contact electrode 63 provided in the third sub-pixel SP3 includes a third lower contact electrode 631 and a third upper contact electrode 632 . The third lower contact electrode 631 is connected to the driving thin film transistor 33 through the circuit contact hole PCNT of the circuit element layer 3 provided in the third sub-pixel SP3 region, and the third The upper contact electrode 632 is connected to the third lower contact electrode 631 through the first contact hole CNT31 of the first insulating layer 41 provided in the third sub-pixel SP3 region.

In the third sub-pixel SP3 , the third lower electrode 531 is provided in the circuit element layer 3 through the third lower contact electrode 631 and the third upper contact electrode 632 . It is connected to the driving thin film transistor 33 , and the third upper electrode 532 is directly connected to the second lower electrode 521 . Accordingly, the third lower electrode 531 may be disposed on the upper surface of the third upper contact electrode 622 . In the third emission area EA3 of the third sub-pixel SP3 , no insulating layer is provided between the third lower electrode 531 and the third upper electrode 532 . In some cases, the third lower contact electrode 631 may be connected to the driving thin film transistor 33 through a conductive material filled in the circuit contact hole PCNT, which may be equally applied to all embodiments below. .

As described above, according to an embodiment of the present invention, the distance between the first lower electrode 511 and the first upper electrode 512 in the first sub-pixel SP1 and the second sub-pixel SP2 The distance between the second lower electrode 521 and the second upper electrode 522 and the distance between the third lower electrode 531 and the third upper electrode 532 in the third sub-pixel SP3 are All are configured differently to obtain microcavity characteristics, which will be described later in detail.

The first insulating layer 41 is provided on the circuit element layer 3 . In particular, the first insulating layer 41 is provided under the first lower contact electrode 611 , the second lower electrode 521 , and the third upper contact electrode 632 . In the first insulating layer 41 , first contact holes CNT11 , CNT21 , and CNT31 are provided for each sub-pixel SP1 , SP2 , and SP3 . The first insulating layer 41 may be formed entirely in the regions of the plurality of sub-pixels SP1, SP2, and SP3 except for the regions of the first contact holes CNT11, CNT21, and CNT31, and thus the first sub-pixel The first insulating layer 41 formed on SP1, the first insulating layer 41 formed on the second sub-pixel SP2, and the first insulating layer 41 formed on the third sub-pixel SP3 may be connected to each other. there is.

The second insulating layer 42 is provided on the first insulating layer 41 . In particular, the second insulating layer 42 is provided under the first upper contact electrode 612 , the second upper contact electrode 622 , and the third lower electrode 531 . Second contact holes CNT12 , CNT22 , and CNT32 are provided in the second insulating layer 42 for each sub-pixel SP1 , SP2 , and SP3 . The second insulating layer 42 may be entirely formed in the plurality of sub-pixels SP1, SP2, and SP3 except for the second contact holes CNT12, CNT22, and CNT32, and thus the first sub-pixel The second insulating layer 42 formed on SP1, the second insulating layer 42 formed on the second sub-pixel SP2, and the second insulating layer 42 formed on the third sub-pixel SP3 may be connected to each other. there is.

Referring to FIG. 2B , the first contact hole CNT11 and the second contact hole CNT12 provided in the first sub-pixel SP1 may be disposed to overlap each other. In addition, the width CNT11W of the first contact hole CNT11 may be wider than the width CNT12W of the second contact hole CNT12 . Accordingly, a portion of the first contact hole CNT11 may be located inside the second contact hole CNT12 . In this way, a part of the first upper contact electrode 612 formed on the second insulating layer 42 may be inserted into the first lower contact electrode 611 formed on the first insulating layer 41, Since the first upper contact electrode 612 and the first lower contact electrode 611 may be disposed at positions substantially coincident with each other in the thickness direction of the insulating layer 4 , the first upper contact electrode 612 and the first lower contact electrode 611 may be disposed on both sides of the first contact area CA1 . 1 The length at which the upper electrodes 512 are planarized may be increased. Accordingly, the organic light emitting layer 7 and the second electrode 8 disposed on the planarized first upper electrode 512 may also increase in length to be planarized like the first upper electrode 512 , and consequently, the micro Light efficiency may be further improved as the area in which the cavity effect is implemented increases.

On the other hand, in the case where the contact region is not disposed in the center of the sub-pixel but adjacent to the trench, if the first contact hole and the second contact hole do not overlap, that is, a portion of the first upper contact electrode is formed adjacent to the first lower portion. If it is not inserted into the contact electrode, a large step may occur due to the insulating layer and the first electrode in the vicinity of the trench. This can cause moisture permeability failure.

Accordingly, in the display device 1 according to an embodiment of the present invention, the width CNT11W of the first contact hole CNT11 is wider than the width CNT12W of the second contact hole CNT12, and the first contact hole ( CNT11) and the second contact hole CNT12 are arranged to overlap each other and a part of the first contact hole CNT11 is positioned inside the second contact hole CNT12, so that the light efficiency can be improved according to the increase in the emission area In addition, by arranging the first contact area CA1 having the above structure at the center of the sub-pixel, the formation of an abnormally shaped trench may be prevented, thereby improving reliability.

The display device according to an embodiment of the present invention is formed in a top emission type. To this end, the first electrodes 51 , 52 , 53 are provided to reflect the light emitted from the organic emission layer 7 upward. do. To this end, the first to third lower electrodes 511, 521, and 531 positioned below the first electrodes 51, 52, 53 having a two-layer structure are formed of a reflective electrode, and the first electrode ( The first to third upper electrodes 512 , 522 , and 532 positioned above the 51 , 52 , and 53 are formed of a transparent electrode or a semi-transparent electrode. In this case, the first to third upper electrodes 512 , 522 , and 532 may function as anodes of the first to third sub-pixels SP1 , SP2 , and SP3 .

Throughout this specification, a reflective electrode is an electrode that reflects incident light, a transparent electrode is an electrode that transmits incident light, and a semi-transparent electrode is an electrode that transmits some of the incident light and reflects the rest, and reflects in terms of transparency. The electrode, the translucent electrode, and the transparent electrode are excellent in transparency in the order, and in terms of reflectivity, the reflectivity is excellent in the order of the transparent electrode, the translucent electrode, and the reflective electrode.

In this case, the second lower contact electrode 621 and the third sub-pixel SP3 of the second sub-pixel SP2 are positioned on the same layer as the first lower electrode 511 of the first sub-pixel SP1 . The third lower contact electrode 631 is patterned through the same process using the same material as the first lower electrode 511 .

Meanwhile, a trench T for isolating a portion of the organic light emitting layer 7 is provided at a boundary between the first to third sub-pixels SP1 , SP2 , and SP3 . On the lower surface of the trench T, an insulating layer 4 adjacent to both sides of the trench T, for example, a first insulating layer 41 positioned in the first sub-pixel SP1 with reference to FIG. 2A and a second insulating layer 41 The second insulating layer 42 and the step difference compensating part 9 for preventing a step difference between the first insulating layer 41 and the second insulating layer 42 positioned in the second sub-pixel SP may be disposed. there is.

The first lower contact electrode 611 of the first sub-pixel SP1 and the second lower electrode 521 of the third sub-pixel SP3 are positioned on the same layer as the second lower electrode 521 of the second sub-pixel SP2. 3 The upper contact electrode 632 is patterned through the same process using the same material as the second lower electrode 521 .

In addition, the first upper contact electrode 612 and the second sub-pixel SP2 of the first sub-pixel SP1 are positioned on the same layer as the third lower electrode 531 of the third sub-pixel SP3. of the second upper contact electrode 622 is patterned through the same process with the same material as that of the third lower electrode 531 .

In addition, the first upper electrode 512 of the first sub-pixel SP1 , the second upper electrode 522 of the second sub-pixel SP2 , and the third sub-pixel SP3 are positioned on the same layer as each other. ), the third upper electrode 532 is patterned through the same process using the same material.

When the first to third lower electrodes 511 , 521 , and 531 are reflective electrodes and the first to third upper electrodes 512 , 522 , and 532 are transparent electrodes, in the organic light emitting layer 7 , A portion of the emitted light is reflected by the first to third lower electrodes 511 , 521 , and 531 , and then passes through the first to third upper electrodes 512 , 522 , and 532 and is emitted upward. In this case, a portion of the light that has passed through the first to third upper electrodes 512 , 522 , and 532 is reflected by the second electrode 8 made of a semi-transparent electrode, and thus the first to third upper electrodes 512 , 522 , The above-described process is repeated while passing through 532 and being re-reflected from the first to third lower electrodes 511 , 521 , and 531 positioned below. As described above, light is amplified while reflection and re-reflection are repeated between the first to third lower electrodes 511 , 521 , and 531 and the second electrode 8 , so that light efficiency can be improved.

In particular, the distance between the first to third lower electrodes 511 , 521 , and 531 and the second electrode 8 is a half wavelength (λ/2) of light emitted from each of the sub-pixels SP1 , SP2 , and SP3 . Constructive interference occurs to further amplify the light when it is an integer multiple of , and when the above-described reflection and re-reflection processes are repeated, the degree of amplification of the light is continuously increased, so that the external extraction efficiency of light can be improved. Such a characteristic is called a microcavity characteristic.

Accordingly, according to an embodiment of the present invention, the first contact electrode 61 , the second contact electrode 62 , and the third contact electrode 63 are used in the first sub-pixel SP1 . 1 A first distance D1 between the lower electrode 511 and the second electrode 8 , a second distance D1 between the second lower electrode 521 and the second electrode 8 in the second sub-pixel SP2 . Since the distance D2 and the third distance D3 between the third lower electrode 531 and the second electrode 8 in the third sub-pixel SP3 may be configured differently, each In the sub-pixels SP1 , SP2 , and SP3 , it is possible to obtain a microcavity characteristic in which light extraction efficiency of different colors is improved.

For example, in the third sub-pixel SP3 that configures the longest distance D1 from the first sub-pixel SP1 emitting red light having a long wavelength band and emitting blue light having a short wavelength band The third distance D3 of may be configured as the shortest, but is not necessarily limited thereto.

On the other hand, in the display device 1 according to an embodiment of the present invention, since the light emitting areas EA1, EA2, EA3 are also formed on both sides of each of the contact areas CA1, CA2, CA3, the microcavity structure, That is, the first lower electrode 511 and the second electrode 8 are arranged at a first distance D1 from the first sub-pixel SP1 , and are arranged at a second distance D2 from the second sub-pixel SP2 . The second lower electrode 521 and the second electrode 8, and the third lower electrode 531 and the second electrode 8 disposed at a third distance D3 from the third sub-pixel SP3 are in contact. It may also be provided on both sides of each of the areas CA1 , CA2 , and CA3 .

According to an embodiment of the present invention, the distance between the first to third upper electrodes 512 , 522 , 532 and the second electrode 8 in each of the plurality of sub-pixels SP1 , SP2 , and SP3 may be the same. and the first to third upper electrodes 512 , 522 , and 532 may be formed on the second insulating layer 42 at the same height. Accordingly, since the lower surface of the organic light emitting layer 7 formed on the first to third upper electrodes 512 , 522 , and 532 has a uniform height as a whole, the first to third upper electrodes 512 , 522 , The profile of the organic light emitting layer 7 may be improved compared to the case where 532 is formed at different heights. In various embodiments below, in each of the plurality of sub-pixels SP1, SP2, and SP3, the distances between the first to third upper electrodes 512, 522, 532 and the second electrode 8 are all formed to be the same, and The first to third upper electrodes 512 , 522 , and 532 may be formed at the same height on the second insulating layer 42 , but are not limited thereto.

Meanwhile, since the distances between the first to third upper electrodes 512 , 522 , 532 and the second electrode 8 in each of the plurality of sub-pixels SP1 , SP2 , and SP3 are all the same, the microcavity effect is substantially reduced the distance between the first lower electrode 511 and the first upper electrode 512 in the first sub-pixel SP1, and the second lower electrode 521 and the second upper electrode in the second sub-pixel SP2 It may be implemented according to the distance between the 522 , and the distance between the third lower electrode 531 and the third upper electrode 532 in the third sub-pixel SP3 . Accordingly, light extraction efficiency of different colors from each of the sub-pixels SP1 , SP2 , and SP3 may be improved.

The fence F is formed on the second insulating layer 42 to cover the ends of the first to third upper electrodes 512 , 522 , and 532 of the first electrodes 51 , 52 , 53 , and accordingly A problem in which currents are concentrated at the ends of the first to third upper electrodes 512 , 522 , and 532 to lower luminous efficiency can be prevented. The fence F may be formed of an inorganic insulating film having a relatively thin thickness, or may be formed of an organic insulating film having a relatively thick thickness.

The fence F is disposed on both sides based on the trench T disposed at the boundary between the plurality of sub-pixels SP1, SP2, and SP3, and is formed in a matrix structure, and the plurality of sub-pixels SP1, SP2, SP3 ) define the light emitting regions EA1, EA2, EA3, respectively. That is, in each of the sub-pixels SP1, SP2, and SP3, the exposed areas of the first to third upper electrodes 512, 522, and 532 exposed without the fence F and the insulating part IP are formed. light emitting areas EA1, EA2, and EA3.

An insulating portion IP may be formed on the contact electrodes 61 , 62 , and 63 of the contact regions CA1 , CA2 , and CA3 to overlap the contact electrodes 61 , 62 , and 63 . The contact areas CA1 , CA2 , and CA3 may not overlap the light emitting areas EA1 , EA2 , and EA3 . The insulating part IP may be provided on the same layer as the fence F and made of the same material.

Meanwhile, a width CEW of each of the contact electrodes 61 , 62 , and 63 may be narrower than a width EW of each of the first electrodes 51 , 52 , and 53 . That is, each of the first to third contact electrodes 61 , 62 , and 63 includes the first to third lower electrodes 511 , 521 , and 531 and the first to third upper electrodes of each of the sub-pixels SP1 , SP2 , and SP3 . The electrodes 512 , 522 , and 532 may be formed to have a narrower width than each of the electrodes. Accordingly, compared to a case in which the contact electrode is provided to have the same width as the first electrode, the light emitting area may be increased, and thus light efficiency may be improved.

In addition, the width CEW of each of the contact electrodes 61 , 62 , and 63 is provided to be smaller than the width EW of each of the first electrodes 51 , 52 , 53 , so that each of the contact regions CA1 , CA2 , and CA3 is formed. The microcavity effect may be implemented between the first to third lower electrodes 511 , 521 , 531 and the second electrode 8 in the light emitting areas EA1 , EA2 , and EA3 disposed on both sides.

As shown in FIG. 1 , each of the first to third contact areas CA1 , CA2 , and CA3 is disposed at the center of each of the sub-pixels SP1 , SP2 , and SP3 in the first direction (X-axis direction) while being disposed in the second direction. The (Y-axis direction) may be disposed at an edge, for example, an upper side of each of the sub-pixels SP1 , SP2 , and SP3 . This is to form the light emitting areas EA1 , EA2 , and EA3 on both sides of each of the contact areas CA1 , CA2 , and CA3 as shown in FIG. 1 .

The reason that the plurality of contact areas CA1 , CA2 , and CA3 is located at the center of the upper side of the plurality of sub-pixels SP1 , SP2 , and SP3 is that the contact areas CA1 , CA2 , and CA3 are formed in the trench T This is because, when disposed close to , the step difference between the trench T and the contact areas CA1 , CA2 , and CA3 increases, so that the trench T is not formed in a normal shape. For example, the heights of the insulating layers positioned on the left and right sides of the trench T are different from each other, so that the organic light emitting layer, the second electrode, and the encapsulation layer disposed on the trench T are inclined due to the abnormal shape of the trench T or the trench. It may have an abnormal shape inserted into (T), which may cause a driving failure due to disconnection of the second electrode or a seam in the encapsulation layer, thereby reducing reliability due to permeation of moisture or the like.

Accordingly, in the display device 1 according to an embodiment of the present invention, the plurality of contact areas CA1 , CA2 , and CA3 are provided to be located in the center of the upper side of the plurality of sub-pixels SP1 , SP2 and SP3, It is possible to form the trench T of a normal shape, thereby preventing the disconnection of the second electrode 8 on the trench T to prevent driving failure, and also to prevent the generation of a seam to improve reliability. can

As a result, as shown in FIG. 1 , the first light emitting area EA1 may be provided on both sides and below the first contact area CA1 , and the second light emitting area EA2 is formed on both sides of the second contact area CA2 . The third light emitting area EA3 may be provided on both sides and the lower side of the third contact area CA3 . In this case, the insulating portions IP1 , IP2 , and IP3 covering the first to third contact areas CA1 , CA2 , CA3 of each of the sub-pixels SP1 , SP2 , and SP3 are fenced in the first direction (X-axis direction). It is spaced apart from (F) and may be in contact with the fence (F) disposed on the upper side in the second direction (Y-axis direction). The insulating portions IP1 , IP2 , and IP3 may be patterned and formed from the same material on the same layer as the fence F .

Therefore, in the first sub-pixel SP1 , the first light emitting area EA1 of the first width W1 is provided below the first contact area CA1 , and the second light emitting area EA1 is provided on one side of the first contact area CA1 . A first light-emitting area EA1 having a width W2 may be provided, and a first light-emitting area EA1 having a second width W2 may be provided on the other side of the first contact area CA1.

In the second sub-pixel SP2 , the second light emitting area EA2 of the first width W1 is provided under the second contact area CA2 , and the second light emitting area EA2 is provided on one side of the second contact area CA2 . A second light emitting area EA2 of W2 may be provided, and a second light emitting area EA2 having a second width W2 may be provided on the other side of the second contact area CA2 .

In the third sub-pixel SP3 , a third light emitting area EA3 having a first width W1 is provided below the third contact area CA3 , and a second width EA3 is provided on one side of the third contact area CA3 . A third light emitting area EA3 of W2 may be provided, and a third light emitting area EA3 having a second width W2 may be provided on the other side of the third contact area CA3 .

The first width W1 may be equal to the sum of the second width W2 , the third width W3 , and the widths of the contact regions CA1 , CA2 , and CA3 . The width of each of the contact areas CA1 , CA2 , and CA3 may be the same as the width of the insulating portion IP shown in FIG. 2A .

As shown in FIG. 2A , the first to third light emitting diodes are disposed on both sides and below each of the first to third contact areas CA1 , CA2 and CA3 of each of the first to third sub-pixels SP1 , SP2 , and SP3 , respectively. The areas EA1 , EA2 , and EA3 are formed on the insulating layer 4 not covered by the first to third upper electrodes 512 , 522 , and 532 and the first to third upper electrodes 512 , 522 , and 532 . After depositing an insulating material forming the fence F or the insulating portion IP on the entire surface, the first to third contact regions CA1 , CA2 , CA3 and the first to third upper electrodes 512 , 522 , and 532 . It can be formed by patterning and removing the remainder except for the portion covering each end. In this case, the insulating material disposed on the trench T may also be removed.

Meanwhile, the plurality of contact areas CA1 , CA2 , and CA3 may be provided to be positioned at the lower center of the plurality of sub-pixels SP1 , SP2 , and SP3 . In this case, the first light emitting area EA1 may be provided on both sides and an upper side of the first contact area CA1 , and the second light emitting area EA2 may be provided on both sides and an upper side of the second contact area CA2 . In addition, the third light emitting area EA3 may be provided on both sides and above the third contact area CA3 . In this case, the insulating portions IP1, IP2, IP3 are spaced apart from the fence F in the first direction (X-axis direction), and come into contact with the fence F disposed on the lower side in the second direction (Y-axis direction). can

The organic light emitting layer 7 is formed on the first to third upper electrodes 512 , 522 , and 532 of the first electrodes 51 , 52 , and 53 . The organic light emitting layer 7 may also be formed on the fence F, the insulating portion IP, and the trench T. That is, the organic light emitting layer 7 is also formed in each of the sub-pixels SP1 , SP2 , and SP3 and a boundary region therebetween.

The organic light emitting layer 7 may be provided to emit white (W) light. To this end, the organic light emitting layer 7 may include a plurality of stacks that emit light of different colors. For example, the organic light emitting layer 7 includes a first stack 71 emitting blue light, a second stack 73 emitting yellow green light, and the first stack 71 and a second stack ( 73) may include a charge generation layer (CGL) 72 provided therebetween, a first stack emitting blue light, a second stack emitting green light, and emitting red light and a third stack, a first charge generation layer provided between the first stack and the second stack, and a second charge generation layer provided between the second stack and the third stack. Each of the stacks may include a hole transport layer, an organic light emitting layer, and an electron transport layer sequentially stacked. The configuration of the organic light emitting layer 7 may be changed to various forms known in the art.

Referring to FIG. 2A , since the trench T is formed at the boundary between the first to third sub-pixels SP1 , SP2 , and SP3 , the organic light emitting layer 7 may be formed in the trench T . Accordingly, a current path is formed between the adjacent first to third sub-pixels SP1 , SP2 , and SP3 to be long, so that it is possible to reduce leakage current between the adjacent sub-pixels SP1 , SP2 , and SP3 . That is, in the case where the distance between the sub-pixels SP1, SP2, and SP3 is densely configured to realize high resolution, when light is emitted from the organic light-emitting layer 7 in any one of the sub-pixels SP1, SP2, and SP3 There is a possibility that electric charges in the organic light emitting layer 7 move to the organic light emitting layer 7 in other adjacent sub-pixels SP1, SP2, and SP3, and a leakage current may occur.

Accordingly, in an embodiment of the present invention, a trench T is formed at the boundary between the sub-pixels SP1, SP2, and SP3 and the organic light emitting layer 7 is formed in the trench T, thereby forming the adjacent sub-pixels SP1. , SP2, SP3) to increase the resistance by forming a long current path to reduce the leakage current.

Meanwhile, the trench T may be formed only between the fences F of each of the sub-pixels emitting light of different colors. Alternatively, the trench T may extend not only to the fence F and the second insulating layer 42 , but also to the inside of the first insulating layer 41 below it or the inside of the circuit element layer 3 . .

In particular, referring to the enlarged view of FIG. 3 , the organic light emitting layer 7 includes a first stack 71 emitting light of a first color, a second stack 73 emitting light of a second color, and the The charge generation layer 72 provided between the first stack 71 and the second stack 73 may be included.

The first stack 71 is formed on the inner side of the trench T, and may also be formed on the lower surface of the inner side of the trench T. In this case, a portion of the first stack 71 formed on the inner side of the trench T and a portion of the first stack 71 formed on the lower surface of the inner side of the trench T are not connected to each other and are disconnected. Accordingly, a portion of the first stack 71 formed on one side, for example, the left side, inside the trench T and the first stack 71 formed on the other side, for example, the right side, inside the trench T Some parts of it are disconnected and not connected to each other. Accordingly, charges cannot move through the first stack 71 between the sub-pixels SP1 , SP2 , and SP3 disposed adjacent to each other with the trench T interposed therebetween.

In addition, the charge generation layer 72 may be formed on the first stack 71 at the inner side of the trench T. At this time, a portion of the charge generation layer 72 formed on one side, for example, the left side, inside the trench T and the other side inside the trench T, for example, the charge generation layer 72 formed on the right side. Some parts of it are disconnected and not connected to each other. Accordingly, charges cannot move through the charge generation layer 72 between the first to third sub-pixels SP1 , SP2 , and SP3 disposed adjacent to each other with the trench T interposed therebetween.

In addition, the second stack 73 is not disconnected between the first to third sub-pixels SP1 , SP2 , and SP3 disposed adjacent to each other with the trench T interposed therebetween on the charge generation layer 72 . can be connected to each other. Accordingly, charges may move through the second stack 73 between the sub-pixels SP1 , SP2 , and SP3 disposed adjacent to each other with the trench T interposed therebetween. However, the present invention is not necessarily limited thereto, and by appropriately controlling the shape of the trench T and the deposition process of the organic light emitting layer 7 , the second stack 73 is also disposed adjacently with the trench T interposed therebetween. It may be configured to be disconnected between the sub-pixels SP1, SP2, and SP3. In particular, only a lower portion of the second stack 73 adjacent to the charge generation layer 72 may be disconnected from the region between the sub-pixels SP1 , SP2 , and SP3 .

The charge generating layer 72 has higher conductivity than the first stack 71 and the second stack 73 . In particular, since the N-type charge generation layer constituting the charge generation layer 72 may include a metal material, conductivity is higher than that of the first stack 71 and the second stack 73 . Accordingly, the movement of charges between the sub-pixels SP1 , SP2 and SP3 disposed adjacent to each other is mainly performed through the charge generation layer 72 , and the amount of movement of charges through the second stack 73 is insignificant. Do.

In the display device 1 according to an embodiment of the present invention, when the organic light emitting layer 7 is formed in the trench T, a part of the organic light emitting layer 7 is cut off in the trench T. In particular, by configuring the first stack 71 and the charge generation layer 72 to be disconnected, it is possible to prevent a leakage current from occurring between the adjacent sub-pixels SP1 , SP2 , and SP3 . Such a configuration of the trench T according to FIG. 3 may be applied to various embodiments to be described later.

The second electrode 8 is formed on the organic light emitting layer 7 . The second electrode 8 may function as a cathode of the display device. Like the organic light emitting layer 7 , the second electrode 8 is also formed in each of the sub-pixels SP1 , SP2 , and SP3 and a boundary region therebetween. That is, as a common layer, the second electrode 8 may also be formed above the fence F, the insulating portion IP, and the trench T.

A display device according to an embodiment of the present invention is made of a top emission method, a portion of the light emitted from the organic emission layer 7 is transmitted upward, and a micro-cavity effect is obtained using the remainder of the emitted light. To this end, the second electrode 8 may be formed of a translucent electrode. Accordingly, light of different colors is repeatedly reflected and re-reflected between the second electrode 8 and the first to third lower electrodes 511 , 521 , and 531 of the first electrodes 51 , 52 , 53 . , for example, it is possible to obtain a microcavity effect in which the extraction efficiency of red light, green light, and blue light is improved.

2A and 3 , the step difference compensating part 9 is formed to be wider than the width TW (shown in FIG. 3 ) of the trench T, and is disposed to be in contact with the lower surface of the trench T can be The step compensation part 9 may be located on the same layer as the first lower electrode 511 of the first sub-pixel SP1 . Accordingly, the step compensation part 9 is disposed on the same layer as the second lower contact electrode 621 of the second sub-pixel SP2 and the third lower contact electrode 631 of the third sub-pixel SP3. can be For example, the step difference compensating part 9, the first lower electrode 511, the second lower contact electrode 621, and the third lower contact electrode 631, as shown in FIG. It may be disposed between the insulating layers 41 . The step difference compensating part 9 may also be disposed between the circuit element layer 3 and the trench T. The step difference compensating part 9 is patterned through the same process using the same material as the first lower electrode 511 , the second lower contact electrode 621 , and the third lower contact electrode 631 .

In this specification, although it has been described that the step compensating part 9 is disposed to be in contact with the lower surface of the trench T, it is not necessarily limited thereto, and the insulating layer 4 between the step compensating part 9 and the lower surface of the trench T ), the step difference compensating part 9 may be in contact with the lower surface of the insulating layer 4 disposed so as to be in contact with the lower surface of the trench T instead of the lower surface of the trench T.

The step difference compensator 9 may be disposed so as not to overlap the first electrodes 51 , 52 , and 53 provided in each of the first to third sub-pixels SP1 , SP2 , and SP3 . For example, if the step difference compensating part overlaps the first lower electrode, a step may occur between the insulating layer disposed on the overlapping portion and the insulating layer disposed on the non-overlapping portion, which may be a first upper electrode formed in a subsequent process. This may prevent it from being provided flat. If the first upper electrode is not provided flat, the organic light emitting layer formed on the first upper electrode and the second electrode are also not provided flat, so that the separation distance between the first lower electrode and the second electrode is different, so that only a specific color Light extraction of other colors may also be improved, resulting in a problem in which unwanted colors are emitted.

Accordingly, in the display device 1 according to the exemplary embodiment of the present invention, the step difference compensating unit 9 is disposed on the first electrode 5 disposed in each of the sub-pixels SP1, SP2, and SP3, for example, the first to third Since the lower electrodes 511 , 521 , and 531 and the first to third upper electrodes 512 , 522 , and 532 are provided so as to not overlap, respectively, light extraction efficiency of only a desired color may be improved.

Meanwhile, the step difference compensating part 9 may have the same thickness as the first lower electrode 511 , the second lower electrode 521 , and the third lower electrode 531 . That is, the thickness (SRT, shown in FIG. 2A ) of the step compensation part 9 is the thickness T1 of the first lower electrode 511 , the thickness T2 of the second lower electrode 521 , and the third lower part. It may be provided to be the same as the thickness T3 of the electrode 531 . Accordingly, in the first sub-pixel SP1 , the step compensating part 91 is a first insulating layer 41 disposed on the step compensating part 9 and a first insulating layer disposed on the first lower electrode 511 . It is possible to prevent a step difference from occurring between the layers 41 , and a step difference between the first insulating layer 41 and the second lower electrode 521 disposed on the step difference compensating part 9 in the second sub-pixel SP2 . can be prevented from occurring, and a step can be prevented from occurring between the second insulating layer 42 and the third lower electrode 531 disposed on the step difference compensating part 9 in the third sub-pixel SP3. can

As a result, in the display device 1 according to an exemplary embodiment of the present invention, the first electrodes 51 , 52 , and the first electrodes 51 , 52 , and the step difference compensator 9 are provided in each of the first to third sub-pixels SP1 , SP2 and SP3 , respectively. 53 , and has the same thickness as each of the first to third lower electrodes 511 , 521 , and 531 , and is disposed on the second insulating layer 42 of each of the sub-pixels SP1 , SP2 , and SP3 The first to third upper electrodes 512 , 522 , and 532 used to be flat may be positioned at the same height without a step difference.

Accordingly, in the display device 1 according to an embodiment of the present invention, only the heights of the first to third lower electrodes 511 , 521 , 531 disposed in each of the sub-pixels SP1 , SP2 , and SP3 are adjusted to adjust the micro-cache. By easily implementing the vertices, the light extraction efficiency of different colors may be improved between the respective sub-pixels SP1, SP2, and SP3.

Referring to FIG. 3 , the width SRW of the step difference compensating part 9 may be narrower than the width EW of each of the first to third lower electrodes 511 , 521 , and 531 . This is because, when the width of the step difference compensating portion is wider than the width of the lower electrode, the width of the non-emission region is relatively increased compared to the width of the light emitting region, and thus luminous efficiency may be reduced. Accordingly, in the display device 1 according to the exemplary embodiment of the present invention, the width SRW of the step difference compensating part 9 is wider than the width TW of the trench T and the first to third lower electrodes 511 and 521 . , 531) is provided to be narrower than each width EW, thereby preventing a step difference from occurring in the insulating layer 4 adjacent to the trench T so that a normal trench T can be formed, and light emission according to an increase in the light emitting area Efficiency can be improved.

On the other hand, the portion that does not overlap the trench (T) in the step difference compensating unit (9) may overlap a portion of the fence (F). More specifically, as shown in FIG. 3 , the portion of the step difference compensating part 9 that does not overlap the trench T is the first electrode 5 (or the first to third upper electrodes 512 , 522 , 532 ). The remaining fences F except for the fences F disposed on the top surface, for example, may overlap with the fence F in contact with the top surface of the second insulating layer 42 .

The step difference compensating part 9 is disposed in the trench T between the first to third sub-pixels SP1, SP2, and SP3, so that between the first lower electrode 511 and the second lower contact electrode 621, and between the second lower contact electrode 621 and the third lower contact electrode 631 . Accordingly, the step compensating unit 9 of the display device 1 according to the present invention includes the first step compensating unit 91 and the second step compensating unit 91 disposed between the first sub-pixel SP1 and the second sub-pixel SP2. A second step difference compensator 92 may be included between the sub-pixel SP2 and the third sub-pixel SP3 .

In the display device 1 according to the present invention, the first step difference compensating part 91 may be connected to the first lower electrode 511 or provided to be spaced apart from the first lower electrode 511 according to an embodiment. .

As shown in FIG. 2A , in the case where the first step compensating part 91 is connected to the first lower electrode 511 , the second step compensating part 92 includes the second lower contact electrode 621 and the third lower electrode 511 . It may be spaced apart from each of the contact electrodes 631 . And, in another embodiment in which the first step compensating part 91 is spaced apart from the first lower electrode 511, the second step compensating part 92 includes the second lower contact electrode 621 and the third lower contact electrode ( 631) may be spaced apart from each other.

The reason why only the first step compensating part 91 is connected to or spaced apart from the first lower electrode 511 is that, unlike the second step compensating part 92 , the first step compensating part 91 is the second step compensating part 91 . ) is disposed closer to the first lower electrode 511 in the first direction (X-axis direction) than the first lower electrode 511 in order to improve red light extraction efficiency in the first sub-pixel SP1. This is because the lower electrode 521 and the third lower electrode 531 are disposed closer to the substrate 2 than the lower electrode 521 . On the other hand, since the second step difference compensating part 92 is disposed on a different layer from the second lower electrode 521 and the third lower electrode 531 , the second lower electrode 521 or the third lower electrode 531 and can't be connected Accordingly, only the first step difference compensating part 91 may be connected to or spaced apart from the first lower electrode 511 .

In the case of an embodiment in which the first step compensating part 91 is connected to the first lower electrode 511, the first lower electrode 511 and the first step compensating part 91 can be integrally formed without a pattern. Therefore, the manufacturing process may be simplified. In another embodiment in which the first step compensating unit 91 is spaced apart from the first lower electrode 511 , the first step compensating unit 91 is connected to adjacent sub-pixels, for example, first to third sub-pixels ( Since SP1, SP2, SP3 may be provided in the form of a stripe so as to be connected to sub-pixels disposed in the second direction (Y-axis direction) perpendicular to the first direction (X-axis direction) in which they are arranged, the manufacturing process may be simplified. can

On the other hand, the reason for disposing the step difference compensating part 9 on the circuit element layer 3 instead of on the first insulating layer 41 or the second insulating layer 42 is that on the circuit element layer 3 By forming the step difference compensating part 9 together when forming the first lower electrode 511 formed for the first time in This is to prevent formation and increase the depth of the trench (T).

For example, if the step difference compensating portion is not formed together with the first lower electrode, a step will occur in the first insulating layer due to a height difference from the circuit element layer at the end of the first lower electrode, which is disposed on the first insulating layer Since a step will also be generated in the second insulating layer, it will be difficult to form the normal trench T. In addition, if the step compensation part is disposed on the first insulating layer or the second insulating layer other than the first lower electrode, the depth of the trench will be lowered, so that a part of the organic light emitting layer disposed on the trench, for example, the charge generating layer is not cut off. Since the sub-pixels can be connected to each other, leakage current may occur between adjacent sub-pixels.

Accordingly, in the display device 1 according to the exemplary embodiment of the present invention, the step difference compensating part 9 is formed on the same layer as the first lower electrode 511 , for example, on the upper surface of the circuit element layer 3 , thereby forming an abnormal trench. (T) formation can be prevented to improve reliability, and by increasing the depth of the trench (T), a part of the organic light emitting layer 7, in particular, the charge generating layer 72, in the trench (T) can be reliably cut off to the adjacent sub It may be provided to prevent leakage current between pixels.

The encapsulation layer 10 is formed on the second electrode 8 to prevent external moisture from penetrating into the organic light emitting layer 7 . The encapsulation layer 10 may be formed of an inorganic insulating material or may have a structure in which an inorganic insulating material and an organic insulating material are alternately stacked, but is not necessarily limited thereto.

The color filter layer 11 is formed on the encapsulation layer 10 . The color filter layer 11 is formed to face the light emitting areas EA1 , EA2 , and EA3 in the individual sub-pixels SP1 , SP2 , and SP3 . The color filter layer 11 includes a red color filter provided in the first sub-pixel SP1, a green color filter provided in the second sub-pixel SP2, and a blue color filter provided in the third sub-pixel SP3. may be included, but is not necessarily limited thereto. Meanwhile, although not shown, a black matrix may be additionally formed at the boundary between the color filter layers 11 to prevent light from leaking to areas other than the light emitting areas EA1 , EA2 , and EA3 .

Referring back to FIG. 3 , the circuit element layer 3 is formed on the substrate 2 , and the first lower electrode 511 is formed in the first sub-pixel SP1 on the circuit element layer 3 . there is.

A first insulating layer 41 is formed on the first lower electrode 511 , and a second lower electrode 521 is formed in the second sub-pixel SP2 on the first insulating layer 41 .

A second insulating layer 42 is formed on the second lower electrode 521, and a first upper electrode 512 is formed in the first sub-pixel SP1 on the second insulating layer 42, A second upper electrode 522 is formed on the second sub-pixel SP2 on the second insulating layer 42 , and a third lower electrode on the third sub-pixel SP3 on the second insulating layer 42 . (531) is formed. A third upper electrode 532 is formed on the third lower electrode 531 .

The first upper electrode 512 , the second upper electrode 522 , and the third upper electrode 532 may be provided at the same height as in FIG. 3 . This means that the first lower electrode 511, the second lower electrode 521, the third lower electrode 531, the first step difference compensating part 91, and the second step difference compensating part 92 are provided with the same thickness. This is because they are provided so as not to overlap each other in the vertical direction of FIG. 3 at the same time.

Fences F are formed on the first upper electrode 512 , the second upper electrode 522 , and the third upper electrode 532 to cover both ends thereof, and first to third sub-pixels ( A trench T is formed between the fences F at the boundary between SP1, SP2, and SP3.

An organic light-emitting layer 7 is formed on the fence F, a second electrode 8 is formed on the organic light-emitting layer 7, and an encapsulation layer 10 is formed on the second electrode 8. and a color filter layer 11 is formed on the encapsulation layer 10 .

The organic light emitting layer 7 may be formed in the trench T. Accordingly, a current path is formed to be long between the adjacent sub-pixels SP1 , SP2 , and SP3 , so that it is possible to reduce leakage current between the adjacent sub-pixels SP1 , SP2 , and SP3 .

Alternatively, a part of the organic light emitting layer 7, for example, the first stack 71 and the charge generation layer 72 is disconnected by the trench T, thereby leaking between the adjacent sub-pixels SP1, SP2, and SP3. Current generation can be reduced.

Meanwhile, in FIG. 3 , since the contact electrodes 61 , 62 , and 63 are not formed for each sub-pixel SP1 , SP2 , and SP3 , the thickness of each of the light emitting areas EA1 , EA2 , EA3 of FIG. 3 is the same as that of FIG. 2A . It may be provided to be thinner than the thickness of each of the contact areas CA1 , CA2 , and CA3 .

4 is a plan view schematically illustrating first to sixth sub-pixels of a display device according to an exemplary embodiment of the present invention.

As shown in FIG. 4 , in the display device 1 according to the exemplary embodiment of the present invention, the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 are arranged in a first direction ( The display device may further include a fourth sub-pixel SP4, a fifth sub-pixel SP5, and a sixth sub-pixel SP6 disposed to be spaced apart from each other in a second direction (Y-axis direction) perpendicular to the X-axis direction. there is.

The fourth to sixth sub-pixels SP4, SP5, and SP6 have the light-emitting areas EA4, EA5, EA6 and the contact areas CA4, CA5, CA6 like the first to third sub-pixels SP1, SP2, and SP3. ) may be included. The light-emitting areas EA4, EA5, EA6 and the contact areas CA4, CA5, and CA6 are the light-emitting areas EA1, EA2, EA3 and the contact area CA1 of the first to third sub-pixels SP1, SP2, and SP3. , CA2, CA3) may be provided in the same structure.

In addition, a trench T may be provided at a boundary portion between the fourth to sixth sub-pixels SP4 , SP5 , and SP6 , and a step compensation part 9 ′ may be provided along the trench T. . The step compensating unit 9' includes the first step compensating unit 91', the fifth sub-pixel SP5, and the fourth sub-pixel SP4 and the fifth sub-pixel SP5. A second step compensation part 92 ′ disposed at a boundary between the six sub-pixels SP6 may be included.

The fourth sub-pixel SP4 is provided to emit light of the same color as that of the first sub-pixel SP1 , for example, red light, and the fifth sub-pixel SP5 is the same as the second sub-pixel SP2 . It is provided to emit light of a color, for example, green light, and the sixth sub-pixel SP6 may be provided to emit light of the same color as that of the third sub-pixel SP3, for example, blue light. Accordingly, a boundary portion between the first sub-pixel SP1 and the fourth sub-pixel SP4 disposed in the second direction (Y-axis direction), and the second sub-pixel SP2 disposed in the second direction (Y-axis direction) ) and the fifth sub-pixel SP5 and at the boundary between the third sub-pixel SP3 and the sixth sub-pixel SP6 arranged in the second direction (Y-axis direction), a trench T is formed. may not be placed.

The trench T is disposed between sub-pixels provided to emit light of different colors to prevent leakage current between the sub-pixels and to prevent light of different colors from being mixed. The display device 1 according to the example does not need to include the trench T because sub-pixels emitting light of the same color are disposed in the second direction (the Y-axis direction).

Since the trench T is not disposed between the sub-pixels in the second direction (the Y-axis direction), the step compensation part 9 for compensating for the step difference around the trench may not be disposed either. Accordingly, as shown in FIG. 4 , the step difference compensator 9 is disposed between the first sub-pixel SP1 and the fourth sub-pixel SP4 , between the second sub-pixel SP2 and the fifth sub-pixel SP5 , and It may not be disposed between the third sub-pixel SP3 and the sixth sub-pixel SP6 .

Meanwhile, since the trench T must be disposed between the sub-pixels provided to emit light of different colors to prevent leakage current, the trench T is formed along the second direction (Y-axis direction) as shown in FIG. 4 . It may be provided in a long stripe shape.

As a result, in the display device 1 according to the embodiment of the present invention, the trench T is disposed in a stripe shape in the second direction (Y-axis direction) between the sub-pixels, and the step difference compensating part 9 is formed. may be formed in the second direction (Y-axis direction) along the trench T. However, as shown in FIG. 4 , the step compensation unit 9 includes a trench T disposed between sub-pixels disposed in the second direction (Y-axis direction), for example, the first sub-pixel SP1 and the fifth sub-pixel SP1 . It may not be formed in the trench T disposed between the pixel SP5 and between the second sub-pixel SP2 and the fourth sub-pixel SP4 .

The first step difference compensator 91 disposed between the first sub-pixel SP1 and the second sub-pixel SP2 is connected to the first lower electrode 511 of the first sub-pixel SP1, and a fourth Since the first step compensation part 91' disposed between the sub-pixel SP4 and the fifth sub-pixel SP5 is connected to the fourth lower electrode of the fourth sub-pixel SP4, the first step compensation part ( This is because, when the 91 ) and the first step difference compensator 91 ′ are connected, a short may occur between the first sub-pixel SP1 and the fourth sub-pixel SP4 .

Accordingly, in the display device 1 according to the exemplary embodiment of the present invention, the step compensation part 9 is disposed only at a boundary portion between sub-pixels disposed in the first direction (X-axis direction), and in the second direction (Y-axis direction). It may be provided so as not to be disposed at a boundary between sub-pixels disposed in the axial direction). Accordingly, the first step difference compensator 91 may be connected to the first lower electrode 511 of the first sub-pixel SP1 to receive a driving voltage applied from the driving thin film transistor 31 , and the first The step difference compensator 91 ′ is connected to the fourth lower electrode of the fourth sub-pixel SP4 to receive a driving voltage applied from the driving thin film transistor, and the second step compensator 92 is connected to the second sub-pixel SP4 . Since it is not connected to the second lower contact electrode 621 of the pixel SP2 and the third lower contact electrode 631 of the third sub-pixel SP3, the driving voltage cannot be applied, and the second step difference compensator 92' ) is not connected to the fifth lower contact electrode of the fifth sub-pixel SP5 and the sixth lower contact electrode of the sixth sub-pixel SP6, and thus the driving voltage cannot be applied.

As a result, as shown in FIG. 4 , the first step difference compensating units 91 and 91 ′ may be provided as driving electrodes (or connection electrodes) for applying a driving voltage, and the second step compensating units 92 and 92 ′ are It may be provided in an island form or a floating form.

5 is a schematic plan view of a display device according to another exemplary embodiment of the present invention, FIG. 6 is a schematic cross-sectional view taken along line III-III' shown in FIG. 5, and FIG. 7 is a line IV-IV shown in FIG. ' is a schematic cross-sectional view of

Referring to FIG. 5 , in the display device 1 according to another embodiment of the present application, the first step difference compensating part 91 is spaced apart from the first lower electrode 511 of the first sub-pixel SP1, and a trench ( It is the same as the display device of FIG. 1 described above, except that it is provided in the form of a stripe along T). 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. 1 , the first step compensating part 91 is connected to the first lower electrode 511 of the first sub-pixel SP1 , and the first step compensating part 91 ′ is the second Since it is connected to the fourth lower electrode of the 4 sub-pixel SP4 , the first step difference compensator 91 and the first step difference compensator 91 ′ are disposed to be spaced apart from each other in the second direction (Y-axis direction). That is, in the display device of FIG. 1 , since the first step difference compensators 91 and 91 ′ function as driving electrodes, they are disposed to be spaced apart from each other.

On the other hand, in the case of the display device according to another exemplary embodiment of FIG. 5 , the first step difference compensator 91 is spaced apart from the first lower electrode 511 of the first sub-pixel SP1, so it cannot function as a driving electrode. , since the first step difference compensator 91 ′ is spaced apart from the fourth lower electrode of the fourth sub-pixel SP4 , it does not function as a driving electrode. Accordingly, as shown in FIG. 5 , the first step difference compensating part 91 and the first step difference compensating part 91 ′ may be provided in the form of a stripe connected to each other. In this case, the driving voltage applied to the first sub-pixel SP1 passes through the first lower electrode 511 and the first contact electrode 61 without passing through the first step difference compensator 91 , but on the first upper electrode 512 . ) and the driving voltage applied to the fourth sub-pixel SP4 may be applied to the fourth upper electrode through the fourth lower electrode and the fourth contact electrode without passing through the first step difference compensator 91 ′. can

On the other hand, the second step compensating part 92 according to another embodiment of FIG. 5 is arranged in the form of a stripe along the trench T arranged in the second direction (Y-axis direction) like the first step compensating part 91 . can be Accordingly, when the display device 1 according to another embodiment of the present invention includes the second step compensation part 92 in a shape different from that of the first step compensation part 91, for example, in an island shape or a floating shape. In comparison, the manufacturing process can be simplified. However, the present invention is not limited thereto, and since the second step difference compensating unit 92 does not function as a driving electrode, it may be provided in an island form or a floating form.

As a result, in the display device 1 according to another exemplary embodiment of the present application, the step compensating unit 9 including the first step compensating unit 91 and the second step compensating unit 92 is the first lower electrode 511 , the second lower contact electrode 621 , and the third lower contact electrode 631 may be spaced apart from each other.

Referring to FIG. 6 , the first step difference compensating part 91 is disposed to be spaced apart from the first lower electrode 511 . To this end, the width EW' of the first lower electrode 511 of the display device according to the embodiment of FIG. 5 is the width EW of the first lower electrode 511 of the display device according to the embodiment of FIG. 1 . ) can be narrower than For example, the width EW' of the first lower electrode 511 of the display device 1 according to another exemplary embodiment of FIG. 5 is the same as the width of the first upper electrode 512 not covered by the fence F. can be formed. However, the present invention is not limited thereto, and the width EW' of the first lower electrode 511 is in the range not connected to the first step difference compensating part 91 and is not covered by the fence F of the first upper electrode 512 . It may be provided wider than the width.

Accordingly, the first insulating layer 41 may be inserted between the first lower electrode 511 of the first sub-pixel SP1 and the first step difference compensating part 91 to be in contact with the upper surface of the circuit element layer 3 . Accordingly, in a region where the first lower electrode 511 and the first step difference compensating part 91 are spaced apart, the first insulating layer 41 may have a step difference. In addition, the second insulating layer 42 and the first upper electrode 512 sequentially disposed on the first insulating layer 41 are also regions in which the first lower electrode 511 and the first step difference compensating part 91 are spaced apart from each other. may be formed to have a step difference in

On the other hand, since the first lower electrode 511 and the first step difference compensating part 91 spaced apart from each other are formed in the entire first sub-pixel SP1, the same structure can be formed even in a portion without the first contact area CA1. can Accordingly, as shown in FIG. 7 , in the region where the first lower electrode 511 and the first step difference compensating part 91 are spaced apart from each other in the first sub-pixel SP1 , the first insulating layer 41 and the second insulating layer 42 . , and the first upper electrode 512 may be provided to have a step difference.

On the other hand, in the second sub-pixel SP2 , the left end of the second lower electrode 521 and the right end of the first step difference compensator 91 are not spaced apart in the first direction (X-axis direction), and the second lower electrode Since the right end of 521 and the left end of the second step difference compensating part 92 are not spaced apart, between the second lower electrode 521 and the first step difference compensating part 91 and the second lower electrode 521 and A step may not occur between the second step difference compensating units 92 . Accordingly, the second upper electrode 522 of the second sub-pixel SP2 may be provided in a flat shape, unlike the first upper electrode 512 .

In the third sub-pixel SP3 , the left end of the third lower electrode 531 and the right end of the second step difference compensating part 92 are not spaced apart in the first direction (X-axis direction), and the third lower electrode 531 is not spaced apart from each other. ) and the left end of the step difference compensator disposed between another sub-pixel adjacent to the right are not spaced apart, between the third lower electrode 531 and the second step compensating part 92 and the third lower electrode ( 531) and the step difference compensator disposed between another adjacent sub-pixel may not have a step difference. Accordingly, the third upper electrode 532 of the third sub-pixel SP3 may be provided in a flat shape like the second upper electrode 522 .

8A to 8C relate to a display device according to still another embodiment of the present invention, which relates to a head mounted display (HMD) device. 8A is a schematic perspective view, FIG. 8B is a schematic plan view of a VR (Virtual Reality) structure, and FIG. 8C is a schematic cross-sectional view of an AR (Augmented Reality) structure.

As can be seen from FIG. 8A , the head mounted display device according to the present invention includes a storage case 12 and a head mounted band 14 .

The storage case 12 houses a display device, a lens array, and an eyepiece lens therein.

The head mounting band 14 is fixed to the storage case 12 . The head mounting band 14 has been exemplified to be formed so as to surround the upper surface and both sides of the user's head, but is not limited thereto. The head mounting band 14 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. 8B , the head mounted display device 1 having a VR (Virtual Reality) structure according to the present invention includes a left-eye display device 2a, a right-eye display device 2b, a lens array 13, 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 13, and the left eyepiece 20a and the right eyepiece 20b are accommodated in the storage case 12 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.

The left-eye display device 2a and the right-eye display device 2b each have a plurality of sub-pixels, a circuit element layer 3, an insulating layer 4, a trench T, a first electrode 5, and a fence ( F), an insulating part (IP), a contact electrode (6), an organic light emitting layer (7), a second electrode (8), a step compensation part (9), an encapsulation layer (10), and a color filter layer (11) In addition, various images can be displayed by combining the colors of light emitted from each sub-pixel in various ways.

The lens array 13 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 13 may be positioned in front of the left eyepiece lens 20a and behind the left eye display device 2a. In addition, the lens array 13 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. there is. That is, the lens array 13 may be positioned in front of the right eye eyepiece 20b and behind the right eye display device 2b.

The lens array 13 may be a micro lens array. The lens array 13 may be replaced with a pin hole array. Due to the lens array 13 , the image displayed on the left-eye display device 2a or the right-eye display device 2b may be enlarged to a 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. 8C , 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 13, a left eye eyepiece 20a, and a transmission reflector 15. , and a transmission window 16 . FIG. 8C 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 13, the left eye eyepiece 20a, the transmissive reflector 15, and the transmissive window 16 are accommodated in the aforementioned storage case 12.

The left-eye display device 2a may be disposed on one side, for example, an upper side, of the transmissive reflector 15 without blocking the transmissive window 16 . Accordingly, the left-eye display device 2a may provide an image to the transmissive reflector 15 without blocking the external background viewed through the transmissive window 16 .

The left-eye display device 2a may include the display device according to FIGS. 1 to 7 described above. At this time, the upper portion corresponding to the surface on which the image is displayed in FIGS. 1 to 7 , for example, the encapsulation layer 10 or the color filter layer 11 faces the transmission reflection unit 15 .

The lens array 13 may be provided between the left eyepiece 20a and the transmissive reflector 15 .

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

The transmissive reflector 15 is disposed between the lens array 13 and the transmissive window 16 . The transmissive reflector 15 may include a reflective surface 15a that transmits a part of light and reflects another part of the light. The reflective surface 15a is formed so that the image displayed on the left-eye display device 2a proceeds to the lens array 13 . Accordingly, the user can see both the external background and the image displayed by the left-eye display device 2a through the transmission window 16 . 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 window 16 is disposed in front of the transmission reflection unit 15 .

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which the present invention pertains that various substitutions, modifications and changes are possible without departing from the technical spirit of the present invention. It will be clear to those who have the knowledge of Therefore, the scope of the present invention 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 invention.

1: Display
2: substrate 3: circuit element layer
4: insulating layer 5: first electrode
6: contact electrode 7: organic light emitting layer
8: second electrode 9: step compensation part
10: encapsulation layer 11: color filter
12: storage case 13: lens array
14: head mounting band 15: transmissive reflector
16: transmission window F: fence
IP: Insulation

Claims (20)

a substrate including a first sub-pixel, a second sub-pixel, and a third sub-pixel;
a circuit element layer including driving thin film transistors respectively provided in the first to third sub-pixels on the substrate;
an insulating layer including a trench provided in a boundary region between the first to third sub-pixels on the circuit element layer;
a first electrode provided in each of the first to third sub-pixels to be spaced apart from the trench;
an organic light emitting layer provided on the first electrode and the trench;
a second electrode provided on the organic light emitting layer; and
It is formed to have a wider width than the trench and includes a step difference compensating part disposed in contact with the lower surface of the trench,
The first electrode provided in the first sub-pixel includes a first upper electrode and a first lower electrode spaced apart from the first upper electrode toward the substrate;
The first lower electrode is provided on the same layer as the step difference compensating part. The method of claim 1,
The step difference compensator does not overlap the first electrode provided in each of the first to third sub-pixels. The method of claim 1,
The step difference compensator is provided with the same thickness as the first lower electrode. The method of claim 1,
The step difference compensating part is narrower than a width of the first lower electrode. The method of claim 1,
The first electrode provided in the second sub-pixel includes a second upper electrode and a second lower electrode spaced apart from the second upper electrode toward the substrate;
The first electrode provided in the third sub-pixel includes a third upper electrode and a third lower electrode in contact with a lower surface of the third upper electrode,
The first lower electrode, the second lower electrode, and the third lower electrode have the same thickness. 6. The method of claim 5,
a first contact electrode disposed between the first lower electrode and the first upper electrode to connect the first lower electrode and the first upper electrode to each other;
The first contact electrode includes a first lower contact electrode and a first upper contact electrode,
the first lower contact electrode is provided between the first lower electrode and the first upper contact electrode to connect the first lower electrode and the first upper contact electrode;
the first upper contact electrode is provided between the first lower contact electrode and the first upper electrode to connect the first lower contact electrode and the first upper electrode;
The first lower electrode is connected to the driving thin film transistor provided in the first sub-pixel through a circuit contact hole provided in the circuit element layer. 7. The method of claim 6,
The insulating layer is
a first insulating layer in which a first contact hole for connecting the first lower contact electrode to the first lower electrode is formed; and
a second insulating layer in which a second contact hole for connecting the first upper contact electrode to the first lower contact electrode is formed;
The first contact hole and the second contact hole overlap each other,
A width of the first contact hole is wider than a width of the second contact hole. 7. The method of claim 6,
a second contact electrode disposed between the second lower electrode and the second upper electrode to connect the second lower electrode and the second upper electrode to each other;
The second contact electrode includes a second lower contact electrode and a second upper contact electrode,
the second lower contact electrode connects the driving thin film transistor provided in the second sub-pixel and the second lower electrode through a circuit contact hole provided in the circuit element layer;
the second upper contact electrode is provided between the second lower electrode and the second upper electrode to connect the second lower electrode and the second upper electrode;
The second lower electrode is provided on the same layer as the first lower contact electrode,
The second lower contact electrode is provided on the same layer as the first lower electrode and the step difference compensating part,
The second upper contact electrode is provided on the same layer as the first upper contact electrode. 9. The method of claim 8,
a third contact electrode disposed between the third lower electrode and the third upper electrode to connect the third lower electrode and the third upper electrode to each other;
The third contact electrode includes a third lower contact electrode and a third upper contact electrode,
the third lower contact electrode connects the driving thin film transistor provided in the third sub-pixel and the third upper contact electrode through a circuit contact hole provided in the circuit element layer;
the third upper contact electrode is provided between the third lower contact electrode and the third lower electrode to connect the third lower contact electrode and the third lower electrode;
the third lower electrode is provided on the same layer as the first upper contact electrode and the second upper contact electrode;
The third lower contact electrode is provided on the same layer as the first lower electrode and the step difference compensating part,
The third upper contact electrode is provided on the same layer as the first lower contact electrode. The method of claim 1,
The substrate may include a fourth sub-pixel, a fifth sub-pixel, and a fourth sub-pixel and a fifth sub-pixel spaced apart from each other in a second direction perpendicular to the first direction in which the first sub-pixel, the second sub-pixel, and the third sub-pixel are arranged; a sixth sub-pixel;
the fourth sub-pixel is provided to emit light of the same color as that of the first sub-pixel;
the fifth sub-pixel is provided to emit light of the same color as that of the second sub-pixel;
The sixth sub-pixel is provided to emit light having the same color as that of the third sub-pixel. 11. The method of claim 10,
The step difference compensator is not disposed between the first sub-pixel and the fourth sub-pixel, between the second sub-pixel and the fifth sub-pixel, and between the third sub-pixel and the sixth sub-pixel. The method of claim 1,
The first sub-pixel includes a first contact region provided with a first contact electrode for connecting the first lower electrode and the first upper electrode, and a first light emitting region in contact with the first contact region;
The first contact area is disposed at the center of the first sub-pixel in a first direction in which the first to third sub-pixels are arranged, and an edge of the first sub-pixel in a second direction perpendicular to the first direction is placed in
The first light emitting region is disposed on both sides and a lower side of the first contact region, or is disposed on both sides and an upper side of the first contact region. The method of claim 1,
a fence covering an edge of the first electrode; and
an insulating part covering the contact area of each of the first to third sub-pixels;
The insulating part is spaced apart from the fence in a first direction in which the first to third sub-pixels are arranged, and is in contact with the fence in a second direction perpendicular to the first direction. 10. The method of claim 9,
The step difference compensation unit,
a first step difference compensator disposed between the first sub-pixel and the second sub-pixel; and
a second step compensator disposed between the second sub-pixel and the third sub-pixel;
The first step difference compensating part is connected to the first lower electrode,
The second step difference compensator is spaced apart from each of the second lower contact electrode and the third lower contact electrode. 10. The method of claim 9,
The step difference compensator is spaced apart from each of the first lower electrode, the second lower contact electrode, and the third lower contact electrode. a first sub-pixel having a first light emitting area and a first contact area on a substrate;
a second sub-pixel having a second light emitting area and a second contact area on the substrate;
a third sub-pixel having a third light emitting area and a third contact area on the substrate;
a first lower electrode and a first upper electrode provided in the first light emitting region;
a second lower electrode and a second upper electrode provided in the second light emitting region;
a third lower electrode and a third upper electrode provided in the third light emitting region;
a first contact electrode provided in the first contact region and connected to the first lower electrode and the first upper electrode;
a second contact electrode provided in the second contact region and connected to the second upper electrode;
a third contact electrode provided in the third contact region and connected to the third lower electrode;
a trench provided in a boundary region between the first to third sub-pixels; and
and a step compensating part that is in contact with a lower surface of the trench and is narrower than each of the first to third lower electrodes and wider than the width of the trench;
The first lower electrode is provided on the same layer as the step difference compensating part,
A distance between the second lower electrode and the second upper electrode is smaller than a distance between the first lower electrode and the first upper electrode and greater than a distance between the third lower electrode and the third upper electrode. 17. The method of claim 16,
Including an insulating layer provided with the trench,
The first contact electrode includes a first lower contact electrode and a first upper contact electrode,
The second contact electrode includes a second lower contact electrode and a second upper contact electrode,
The third contact electrode includes a third lower contact electrode and a third upper contact electrode,
The insulating layer is
a first insulating layer in which a first contact hole for connecting the first lower contact electrode to the first lower electrode is formed; and
a second insulating layer in which a second contact hole for connecting the first upper contact electrode to the first lower contact electrode is formed;
The first contact hole and the second contact hole overlap each other,
A width of the first contact hole is wider than a width of the second contact hole. 18. The method of claim 17,
The step difference compensation unit,
a first step difference compensator disposed between the first sub-pixel and the second sub-pixel; and
a second step compensator disposed between the second sub-pixel and the third sub-pixel;
The first step difference compensating part is connected to the first lower electrode,
The second step difference compensator is spaced apart from each of the second lower contact electrode and the third lower contact electrode. 18. The method of claim 17,
The step difference compensator is spaced apart from each of the first lower electrode, the second lower contact electrode, and the third lower contact electrode. 20. The method according to any one of claims 1 to 19,
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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