Display device

Abstract

A display apparatus includes an upper substrate including a first area corresponding to a first light emitting device, a second color filter layer on a lower surface of the upper substrate and including a first opening exposing the first area, a first color filter layer including a portion filling the first opening and a portion on a lower surface of the second color filter layer, a dam between the first color filter layer and the second color filter layer and the lower substrate, the dam including a second opening corresponding to the first area, and a first color quantum dot layer filling the second opening, wherein the second opening includes a portion overlapping the first opening in a plan view and a portion outside the first opening.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2020-0083671, filed on July 7, 2020, in the Korean Intellectual Property Office (KIPO), the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The disclosure relates to a display apparatus, and more particularly, to a display apparatus having improved efficiency. BACKGROUND

[0004] A display apparatus includes pixels. The pixels can emit different colors of light to implement a full-color display apparatus. To this end, at least some of the pixels of the display apparatus have a color conversion unit. Thus, first color light generated from a light emitting part of some of the pixels is converted into second color light while passing through a corresponding color conversion unit, and then transmitted to the outside. A conventional display apparatus has low light efficiency. SUMMARY

[0005] One or more embodiments include a display apparatus having improved light efficiency. However, the above technical features are exemplary, and the scope of the disclosure is not limited thereto.

[0006] Additional aspects will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the description, or can be learned by practice of the presented embodiments of the disclosure.

[0007] According to an embodiment, a display apparatus can include a lower substrate, a first light emitting device on the lower substrate, the first light emitting device including a second color light emitting layer, an upper substrate above the lower substrate, the first light emitting device disposed between the upper substrate and the lower substrate, the upper substrate including a first area corresponding to the first light emitting device, a second color color filter layer on a lower surface of the upper substrate, wherein the lower surface faces the lower substrate, and the second color color filter layer includes a first opening exposing the first area, a first color color filter layer including a portion filling the first opening and a portion on a lower surface of the second color color filter layer, wherein the lower surface of the second color color filter layer can face the lower substrate, a dam between the first color color filter layer and the second color color filter layer and the lower substrate, the dam including a second opening corresponding to the first area, and a first color quantum dot layer filling the second opening, wherein the second opening can include a portion overlapping the first opening in a plan view and a portion outside the first opening.

[0008] The first opening can include a portion overlapping the second opening in the plan view and a portion outside the second opening.

[0009] The first opening and the second opening each can have a rectangular shape in the plan view.

[0010] The first opening and the second opening each can have a square shape in the plan view.

[0011] In the plan view, if the second opening is rotated by 45° about a center of the second opening, edges of the second opening can be parallel to edges of the first opening.

[0012] In the plan view, if the second opening is rotated by 45° about a center of the second opening, edges of the second opening can correspond to edges of the first opening.

[0013] The display apparatus can further include a second light emitting device on the lower substrate, the second light emitting device including a second color light emitting layer, wherein the second color filter layer can overlap a second area of the upper substrate, the second area corresponding to the second light emitting device, the first color filter layer can include a third opening corresponding to the second area, the dam can include a fourth opening corresponding to the second area, and the fourth opening can include a portion overlapping the third opening in the plan view and a portion outside the third opening.

[0014] The third opening can include a portion overlapping the fourth opening in the plan view and a portion outside the fourth opening.

[0015] The third opening and the fourth opening each can have a rectangular shape in the plan view.

[0016] The third opening and the fourth opening each can have a square shape in the plan view.

[0017] In the plan view, if the fourth opening is rotated by 45° about a center of the fourth opening, edges of the fourth opening can be parallel to edges of the third opening.

[0018] In the plan view, if the fourth opening is rotated by 45° about a center of the fourth opening, edges of the fourth opening can correspond to edges of the third opening.

[0019] The display apparatus can further include a third light emitting device on the lower substrate, the third light emitting device including a second color light emitting layer, wherein the second color filter layer can include a fifth opening exposing a third region of the upper substrate, the third region corresponding to the third light emitting device, the first color filter layer can include a sixth opening corresponding to the third region, the dam can include a seventh opening corresponding to the third region, and the seventh opening can include a portion overlapping the fifth opening and a portion outside the fifth opening in the plan view.

[0020] The fifth opening can include a portion overlapping the seventh opening and a portion outside the seventh opening in the plan view.

[0021] The fifth opening and the seventh opening can each have a rectangular shape in the plan view.

[0022] The fifth opening and the seventh opening can each have a square shape in the plan view.

[0023] In the plan view, if the seventh opening is rotated by 45° about a center of the seventh opening, an edge of the seventh opening can be parallel to an edge of the fifth opening.

[0024] In the plan view, if the seventh opening is rotated by 45° about a center of the seventh opening, an edge of the seventh opening can correspond to an edge of the fifth opening.

[0025] In the plan view, an area of the sixth opening can be equal to or greater than an area of the fifth opening.

[0026] In the plan view, an edge of the sixth opening can correspond to an edge of the fifth opening.

[0027] In the plan view, an edge of the fifth opening can be located in the sixth opening.

[0028] The display apparatus can further include a third color filter layer filling the fifth opening and a third color quantum dot layer filling the seventh opening.

[0029] The third color filter layer can include an eighth opening corresponding to the first region and a ninth opening corresponding to the second region.

[0030] In the plan view, an area of the eighth opening can be equal to or greater than an area of the first opening, and an area of the ninth opening can be equal to or greater than an area of the third opening.

[0031] In the plan view, an edge of the eighth opening can correspond to an edge of the first opening, and an edge of the ninth opening can correspond to an edge of the third opening.

[0032] In the plan view, an edge of the first opening can be located in the eighth opening, and an edge of the third opening can be located in the ninth opening.

[0033] According to an embodiment, a display device can include a lower substrate including a display area, the display area including a first edge, a second edge facing the first edge, a third edge connecting one end of the first edge to one end of the second edge, and a fourth edge connecting another end of the first edge to another end of the second edge; a first light emitting device, a second light emitting device, and a third light emitting device located in the display area on the lower substrate, the first light emitting device, the second light emitting device, and the third light emitting device including an emission layer emitting light having a wavelength within a wavelength band; an upper substrate located above the lower substrate, the first light emitting device, the second light emitting device, and the third light emitting device being disposed between the upper substrate and the lower substrate; a second color filter layer located on a lower surface of the upper substrate facing the lower substrate, wherein the second color filter layer can include a first opening overlapping the first light emitting device and including an edge not parallel to the first edge, the second edge, the third edge, and the fourth edge, and a second opening overlapping the third light emitting device and including an edge not parallel to the first edge, the second edge, the third edge, and the fourth edge; a first color filter layer located on the lower surface of the upper substrate, wherein the first color filter layer can fill the first opening and can include a third opening overlapping the second light emitting device and including an edge not parallel to the first edge, the second edge, the third edge, and the fourth edge in a plan view, and a fourth opening overlapping the third light emitting device and including an edge not parallel to the first edge, the second edge, the third edge, and the fourth edge in the plan view; a third color filter layer located on the lower surface of the upper substrate, the third color filter layer filling the second opening and the fourth opening; a dam located between the first color filter layer, the second color filter layer, and the third color filter layer and the lower substrate, and including a fifth opening, a sixth opening, and a seventh opening, wherein the fifth opening can overlap the first light emitting device and can include an edge parallel to the first edge, the second edge, the third edge, and the fourth edge in the plan view, the sixth opening can overlap the second light emitting device and can include an edge parallel to the first edge, the second edge, the third edge, and the fourth edge in the plan view, and the seventh opening can overlap the third light emitting device and can include an edge parallel to the first edge, the second edge, the third edge, and the fourth edge in the plan view; and a quantum dot layer filling two of the fifth opening, the sixth opening, and the seventh opening.

[0034] The first light emitting device, the second light emitting device, and the third light emitting device each can include a second color light emitting layer, and the quantum dot layer can include a first color quantum dot layer filling the fifth opening and a third color quantum dot layer filling the seventh opening.

[0035] A virtual straight line connecting a center of the first opening to a center of the second opening can not be parallel to the first edge and the third edge.

[0036] At least one of the edges of the first opening and at least one of the edges of the second opening can be located on a same virtual straight line, and the virtual straight line can not be parallel to the first edge and the third edge.

[0037] At least one of the edges of the third opening can be located on the virtual straight line.

[0038] The edges of the third opening can not be located on the virtual straight line.

[0039] The first opening, the second opening, the third opening, and the fourth opening each can have a rectangular shape in the plan view.

[0040] In the plan view, if the fifth opening is rotated by 45° about a center of the fifth opening, edges of the fifth opening can be parallel to the edges of each of the first opening, the second opening, the third opening, and the fourth opening.

[0041] In the plan view, an area of the second opening can be equal to an area of the first opening.

[0042] In the plan view, an area of the second opening can be equal to an area of the third opening.

[0043] Other aspects, features, and advantages of the present disclosure will become more apparent from the following detailed description in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0044] The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0045] Figure 1 is a schematic sectional view of a display apparatus according to an embodiment;

[0046] Figure 2 is a schematic plan view showing a portion of the display apparatus of Figure 1 ; and

[0047] Figure 3 is a schematic plan view showing another portion of the display device of Figure 1

[0048] Figure 4 is a schematic plan view showing another portion of the display device of Figure 1

[0049] Figure 5 is a schematic plan view showing a portion of the display device of Figure 1

[0050] Figure 6 is a schematic conceptual view showing a light extraction area from the user side of the display device of Figure 1

[0051] Figure 7 is a schematic cross-sectional view of the display device taken along line A'-B', line B'-C', and line C'-D' of Figures 2-6

[0052] Figure 8 is a schematic plan view showing a portion of the display device according to another embodiment;

[0053] Figure 9 is a schematic plan view showing a portion of the display device according to another embodiment;

[0054] Figure 10 is a schematic cross-sectional view of the display device taken along line A"-B", line B"-C", and line C"-D" of Figure 9

[0055] Figure 11 is a schematic plan view showing a portion of the display device according to another embodiment;

[0056] Figure 12 is a schematic cross-sectional view of the display device taken along line A"'-B"', line B"'-C"', and line C"'-D"' of Figure 11

[0057] Figure 13 is a schematic plan view showing a portion of the display device according to another embodiment;

[0058] Figure 14 is a schematic plan view showing a portion of the display device according to another embodiment;

[0059] Figure 15 is a schematic plan view showing a portion of the display device according to another embodiment; and

[0060] ​​​​​​​Figure 16 is a schematic cross-sectional view illustrating a display apparatus according to another embodiment. DETAILED DESCRIPTION

[0061] Reference will now be made in detail embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the embodiments can have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the drawings, to explain aspects of the present description. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. In the description and claims, the phrase "at least one of" followed by a list of two or more items means that at least one of the listed items is present at the minimum, but that a larger number of items can also be present. For example, "at least one of A and B" can mean, A or B or A and B.

[0062] Because the present disclosure can have various modified embodiments, the embodiments are shown in the drawings and are described in the detailed description. The effects and features of the present disclosure and methods of achieving the effects and features will be apparent from the embodiments described in reference to the drawings. However, the present disclosure can be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0063] One or more embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. Those components that are the same or correspond to each other are given the same reference numerals regardless of the figure number, and redundant descriptions are omitted.

[0064] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In order to facilitate the description of the embodiments, the size of components in the drawings can be exaggerated. In other words, the size and thickness of components in the drawings are arbitrarily shown for the purpose of making the description clear, and the following embodiments are not limited thereto.

[0065] In the following examples, the X-axis, Y-axis and Z-axis are not limited to three axes of a rectangular coordinate system, and can be interpreted in a broader sense. For example, the X-axis, Y-axis and Z-axis can be perpendicular to each other, or can represent different directions that are not perpendicular to each other.

[0066] Unless otherwise defined or implied herein, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will also be understood that, unless clearly defined in the specification, terms (such as those defined in a common dictionary) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this disclosure, and shall not be interpreted as having an ideal or overly formal meaning.

[0067] It will be understood that although various elements may be described herein using terms such as “first,” “second,” or “third,” these elements should not be limited by these terms. These terms are used to distinguish one element from others. Therefore, without departing from the teachings herein, the “first” element discussed below may be named a “second” element or a “third” element, and “second” and “third” elements may be named similarly.

[0068] Figure 1 This is a schematic cross-sectional view of a display device according to an embodiment. Figure 2 It shows Figure 1 A schematic floor plan of a portion of the display device. Figure 3 It shows Figure 1 A schematic floor plan of another part of the display device. Figure 4 It shows Figure 1 A schematic floor plan of another part of the display device, and Figure 5 It shows Figure 1 A schematic plan view of a portion of a display device. Figure 1 It is along Figures 2-6 A schematic cross-sectional view of the display device taken from lines AB, BC, and CD. Figure 7 It is along Figures 2-6 A schematic cross-sectional view of the display device taken by lines A'-B', B'-C', and C'-D'.

[0069] The display device according to the embodiment may include a lower substrate 100, a first light-emitting device located on the lower substrate 100, an upper substrate 400, a first color filter layer 410, a second color filter layer 420, a dam 500, and a first color quantum dot layer 415.

[0070] The lower substrate 100 can include glass, metal, or a polymer resin. In the case where the lower substrate 100 is flexible or bendable, the lower substrate 100 can include a polymer resin such as polyether sulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, or cellulose acetate propionate. The lower substrate 100 can be variously modified, and can have, for example, a multi-layer structure including two layers each having such a polymer resin and a barrier layer disposed between the two layers and including an inorganic material such as silicon oxide, silicon nitride, and silicon oxynitride.

[0071] A first light emitting device including a first pixel electrode 311 can be located on the lower substrate 100. In addition to the first light emitting device, a first thin film transistor 210 electrically connected to the first light emitting device can be located on the lower substrate 100. As Figure 1 and Figure 7 As shown in FIGS. 1A and 1B, in the case where the first light emitting device is electrically connected to the first thin film transistor 210, the first pixel electrode 311 of the first light emitting device can be electrically connected to the first thin film transistor 210.

[0072] The first thin film transistor 210 can include a first semiconductor layer 211, a first gate electrode 213, a first source electrode 215a, and a first drain electrode 215b, and the first semiconductor layer 211 can include amorphous silicon, polycrystalline silicon, an organic semiconductor material, or an oxide semiconductor material. The first gate electrode 213 can have various layered structures including various conductive materials, and can include, for example, a Mo layer and an Al layer. The first gate electrode 213 can have a layered structure including a Mo layer, an Al layer, or a Mo layer. The first gate electrode 213 can include a TiN x layer, an Al layer, and / or a Ti layer. The first source electrode 215a and the first drain electrode 215b can also have various layered structures (e.g., a Ti layer, an Al layer, and / or a Cu layer) including various conductive materials. In this case, the first source electrode 215a and the first drain electrode 215b can each have a layered structure including a Ti layer, an Al layer, and a Ti layer.

[0073] To ensure insulating properties between the first semiconductor layer 211 and the first gate electrode 213, a gate insulating layer 121 including an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride can be located between the first semiconductor layer 211 and the first gate electrode 213. An interlayer insulating layer 131 including an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride can be located on the first gate electrode 213, and the first source electrode 215a and the first drain electrode 215b can be located on the interlayer insulating layer 131. The insulating layer including the inorganic material can be obtained by a chemical vapor deposition (CVD) or an atomic layer deposition (ALD) method. This can also be applied to the embodiments described below and modifications thereof.

[0074] A buffer layer 110 including an inorganic material such as silicon oxide, silicon nitride, and / or silicon oxynitride can be located between the first thin-film transistor 210 having the above structure and the lower substrate 100. The buffer layer 110 can improve the smoothness of the upper surface of the lower substrate 100, or can prevent or significantly reduce the penetration of impurities from the lower substrate 100 into the first semiconductor layer 211 of the first thin-film transistor 210.

[0075] A planarization layer 140 can be located on the first thin-film transistor 210. For example, in the case where the organic light-emitting device is the first light-emitting device as illustrated in Figure 1 and Figure 7 The planarization layer 140 can planarize the upper portion of the protective layer covering the first thin-film transistor 210, in the case where the first light-emitting device as illustrated in Figure 1 and Figure 7 The planarization layer 140 can have a single-layer structure in

[0076] The first light-emitting device can be located on the planarization layer 140 on the lower substrate 100. In Figure 1 and Figure 7 The organic light-emitting device as the first light-emitting device can be located on the planarization layer 140 in Figure 1 and Figure 7The first pixel electrode 311 can include a light-transmissive conductive layer including a light-transmissive conductive oxide such as ITO, In203, or IZO and a reflective layer including a metal such as Al or Ag. For example, the first pixel electrode 311 can have a three-layer structure including an ITO layer, an Ag layer, and an ITO layer.

[0077] The intermediate layer 303 including the second color light-emitting layer can be patterned to correspond to the first pixel electrode 311, but can also be located on the second pixel electrode 321 and the third pixel electrode 331 on the lower substrate 100 as illustrated in FIGS. 1A and 1B, so as to be integrally formed across the first pixel electrode 311, the second pixel electrode 321, and the third pixel electrode 331. Figure 1 and Figure 7 The counter electrode 305 located on the intermediate layer 303 can also be integrally formed across the first pixel electrode 311, the second pixel electrode 321, and the third pixel electrode 331. The counter electrode 305 can include a light-transmissive conductive layer including ITO, In203, IZO, or the like and can include a semi-transmissive layer including a metal such as Al, Ag, or the like. For example, the counter electrode 305 can include a semi-transmissive layer including MgAg.

[0078] The pixel-defining layer 150 can be located on the planarization layer 140. The pixel-defining layer 150 can include openings corresponding to each of the pixels PX1, PX2, and PX3, for example, an opening exposing the center of the first pixel electrode 311, to define the pixels PX1, PX2, and PX3. In the embodiment of FIGS. 1A and 1B, the pixel-defining layer 150 can include an opening exposing the center of the second pixel electrode 321 and an opening exposing the center of the third pixel electrode 331. Figure 1 and Figure 2 In the embodiment of FIGS. 1A and 1B, the pixel-defining layer 150 can increase the distance between the edge of the first pixel electrode 311 and the counter electrode 305, thereby preventing arcing at the edge of the first pixel electrode 311. The pixel-defining layer 150 can include, for example, an organic material such as polyimide, hexamethyldisiloxane (HMDSO), or the like.

[0079] The intermediate layer 303 can include a high molecular weight material or a low molecular weight material. In the case where the intermediate layer 303 includes a low molecular weight material, the intermediate layer 303 can have a single layer or a multi-layer structure in which a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and / or an electron injection layer (EIL) are stacked individually or in a combined manner, and can be formed by a vacuum deposition method. In the case where the intermediate layer 303 includes a high molecular weight material, the intermediate layer 303 can have a structure including an HTL and an EML. The HTL can include poly 3,4-ethylenedioxythiophene (PEDOT), and the EML can include a polyphenylenevinylene (PPV)-based or a polyfluorene-based polymer material. The intermediate layer 303 can be formed by a screen printing method, an inkjet printing method, a deposition method, or a laser-induced thermal imaging (LITI) method, etc. However, the intermediate layer 303 is not limited thereto, and can have various structures.

[0080] The intermediate layer 303 can include a layer integrally formed as a single body throughout the first pixel electrode 311, the second pixel electrode 321, and the third pixel electrode 331 as described above. However, if necessary, the intermediate layer 303 can include a layer patterned to correspond to each of the first pixel electrode 311, the second pixel electrode 321, and the third pixel electrode 331. In either case, the intermediate layer 303 can include a second color emission layer. The second color emission layer can be integrally formed as a single body throughout the first pixel electrode 311, the second pixel electrode 321, and the third pixel electrode 331, but if necessary, can be patterned to correspond to each of the first pixel electrode 311, the second pixel electrode 321, and the third pixel electrode 331. The second color emission layer can emit light within a second wavelength band, for example, light having a wavelength in a range of about 450 nm to about 495 nm.

[0081] The counter electrode 305 can be located on the intermediate layer 303 to correspond to the first pixel electrode 311, the second pixel electrode 321, and the third pixel electrode 331. The counter electrode 305 can be integrally formed as a single body throughout the organic light emitting device.

[0082] The organic light emitting device can be vulnerable to external moisture or oxygen, and thus, an encapsulation layer (not shown) can cover or overlap the organic light emitting device to protect the organic light emitting device. The encapsulation layer can include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer.

[0083] The upper substrate 400 can be positioned above the lower substrate 100 so that the first light emitting device having the first pixel electrode 311 can be positioned between the upper substrate 400 and the lower substrate 100. The upper substrate 400 can include a polymer resin. For example, the upper substrate 400 can include a polymer resin such as polyether sulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose acetate propionate, or the like. The upper substrate 400 can be variously modified. For example, the lower substrate 100 can have a multi-layer structure including two layers each having a polymer resin and a barrier layer including an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, or the like positioned between the two layers. The upper substrate 400 can be flexible or bendable. The upper substrate 400 can include a first area A1 corresponding to the first light emitting device. In the case where the first area A1 corresponds to the first light emitting device, the first area A1 can overlap the first pixel electrode 311 when viewed in a direction perpendicular to the upper substrate 400 (Z-axis direction) (or in a plan view).

[0084] The second color filter layer 420 can be positioned on a lower surface 400b of the upper substrate 400 in a direction (Z-axis direction) toward the lower substrate 100. The second color filter layer 420 can transmit only light having a wavelength in a range of about 450 nm to about 495 nm. The second color filter layer 420 can be used to reduce external light reflection in the display device. The second color filter layer 420 can include a 2-1st opening 421 exposing the first area A1, as shown in Figure 7 、 Figure 5 and Figure 1 . The 2-1st opening 421 can define an area of the first color pixel (first pixel PX1). This will be described below.

[0085] The first color filter layer 410 can transmit only light having a wavelength in a range of about 495 nm to about 570 nm. The first color filter layer 410 can include a portion positioned on a lower surface of the second color filter layer 420 in a direction (Z-axis direction) toward the lower substrate 100 and a portion filling the 2-1st opening 421 of the second color filter layer 420. The portion of the first color filter layer 410 filling the 2-1st opening 421 of the second color filter layer 420 can be positioned on the lower surface 400b of the upper substrate 400 in a direction (Z-axis direction) toward the lower substrate 100.

[0086] The dam 500 can be located between the first color filter layer 410 and the second color filter layer 420 and the lower substrate 100. The dam 500 can include a first opening 501 corresponding to the first area A1. However, the first opening 501 of the dam 500 does not completely correspond to the first area A1 when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. For example, the first opening 501 of the dam 500 can include a portion overlapping the 2-1 opening 421 of the second color filter layer 420 and a portion located outside the 2-1 opening 421 when viewed (or in a plan view) in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400, as shown in FIG. 6B. Figure 6 Accordingly, the 2-1 opening 421 of the second color filter layer 420 can include a portion overlapping the first opening 501 of the dam 500 and a portion located outside the first opening 501 when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400.

[0087] The first opening 501 of the dam 500 can correspond to an opening of the pixel definition layer 150 that defines the area of the first pixel PX1. However, as shown in FIG. 6B, the area of the first opening 501 of the dam 500 can be greater than the area of the opening of the pixel definition layer 150 that defines the area of the first pixel PX1 when viewed in a direction (Z-axis direction) perpendicular to the upper surface 400a of the upper substrate 400. Figure 1 For example, in the case where the first opening 501 of the dam 500 corresponds to the opening of the pixel definition layer 150 that defines the area of the first pixel PX1, the shape of the boundary of the first opening 501 in the dam 500 can be the same as or similar to the shape of the opening of the pixel definition layer 150 that defines the area of the first pixel PX1 when viewed in a direction (Z-axis direction) perpendicular to the upper surface 400a of the upper substrate 400.

[0088] The dam 500 can include various materials, for example, inorganic materials such as silicon oxide, silicon nitride, and / or silicon oxynitride. If necessary, the dam 500 can include a photoresist material, and thus, the dam 500 can be easily formed by any process such as exposure, development, etc.

[0089] The first color quantum dot layer 415 can fill the first opening 501 of the bank 500. The first color quantum dot layer 415 can convert light in a second wavelength band generated by the intermediate layer 303 located on the first pixel electrode 311 into light in a first wavelength band. For example, in the case where the intermediate layer 303 located on the first pixel electrode 311 generates light having a wavelength in the range of about 450 nm to about 495 nm, the first color quantum dot layer 415 can convert the light into light having a wavelength in the range of about 495 nm to about 570 nm. Accordingly, light having a wavelength in the range of about 495 nm to about 570 nm can be emitted from the first pixel PX1 to the outside via the upper substrate 400.

[0090] The first color quantum dot layer 415 can have a structure in which quantum dots are distributed in a resin. The quantum dots can include a semiconductor material such as cadmium sulfide (CdS), cadmium telluride (CdTe), zinc sulfide (ZnS), or indium phosphide (InP). Each quantum dot can have a size of several nanometers, and the wavelength of converted light can vary according to the size of the quantum dots. The first color quantum dot layer 415 can include any type of resin as long as the resin is a light-transmitting material. For example, a polymer resin such as acrylic, benzocyclobutene (BCB), or hexamethyldisiloxane (HMDSO) can be used as a material for forming the first color quantum dot layer 415. The material for forming the first color quantum dot layer 415 can be located in the first opening 501 of the bank 500 by an inkjet printing method.

[0091] Figure 7 is from Figure 6 and Figure 6 A schematic conceptual view of the light extraction area EAG is shown from the perspective of a user of the display apparatus. Figure 2 The light extraction area EAG in the first pixel PX1 is shown when viewed from the upper surface 400a of the upper substrate 400. As Figure 5 The light extraction area EAG in the first pixel PX1 can have an octagonal shape, as shown in FIG. 4B.

[0092] As a result of experiments conducted under different conditions, it can be seen that light efficiency is highest in the case where the length of the edge of the light extraction area EAG is smallest in each pixel (or sub-pixel) using a quantum dot layer in the display apparatus. In order to minimize the length of the edge of the light extraction area EAG while the area of the light extraction area is uniform, the light extraction area EAG can be circular in a plan view. However, it is not easy to manufacture the light extraction area EAG to have a circular shape in a plan view during a manufacturing process of the display apparatus.

[0093] The display apparatus according to an embodiment can include a light extraction area EAG having a substantially octagonal shape in a first pixel PX1 in which the first light emitting device is located when the light extraction area EAG is viewed from the upper surface 400a of the upper substrate 400. The light extraction area EAG in the first pixel PX1 can be defined as a portion in which the 2-1th opening 421 of the second color filter layer 420 and the first opening 501 of the dam 500 overlap each other. The first color quantum dot layer 415 can be located in the first opening 501 of the dam 500 to convert light emitted from the second color light emitting layer of the first light emitting device including the first pixel electrode 311 into light of the first wavelength band, and then the converted light can be emitted to the outside only through the 2-1th opening 421 of the second color filter layer 420. Accordingly, the display apparatus according to an embodiment can include a light extraction area EAG having an octagonal shape similar to a circular shape in the first pixel PX1 in which the first light emitting device is disposed when viewed (or in a plan view) from the upper surface 400a of the upper substrate 400. Accordingly, the length of the edge of the light extraction area EAG in the first pixel PX1 can be reduced, thereby improving light efficiency.

[0094] As described above, in order for the light extraction area EAG in the first pixel PX1 in which the first light emitting device is located when viewed in a direction perpendicular to the upper surface 400a of the upper substrate 400 to have an octagonal shape (approximately or substantially) similar to a circular shape, each of the 2-1th opening 421 of the second color filter layer 420 and the first opening 501 of the dam 500 can have a quadrangular shape when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. As Figure 1 and Figure 7 As shown in FIGS. 15A and 15B, the 2-1th opening 421 of the second color filter layer 420 and the first opening 501 of the dam 500 can each have a square shape when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. If the first opening 501 of the dam 500 is rotated by 45° around the center of the first opening 501 when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400, the edge of the 2-1th opening 421 of the second color filter layer 420 can be parallel to the edge of the first opening 501 of the dam 500. Accordingly, the light extraction area EAG of the first pixel PX1 in which the first light emitting device is located can have an octagonal shape similar to a circular shape when viewed in a direction perpendicular to the upper surface 400a of the upper substrate 400.

[0095] As Figure 1 and Figure 7As shown in FIG. 1, the display device according to the embodiment can include a second light emitting device located in the second pixel PX2. The second light emitting device can include an organic light emitting device including a second pixel electrode 321, a counter electrode 305, and an intermediate layer 303 disposed between the second pixel electrode 321 and the counter electrode 305 and including a second color light emitting layer. In addition to the second light emitting device, a second thin film transistor 220 electrically connected to the second light emitting device can be located on the lower substrate 100. The second thin film transistor 220 can include a second drain electrode 225b, a second semiconductor layer 221, a second gate electrode 223, and a second source electrode 225a. As shown in FIG. 1, the second drain electrode 225b of the second thin film transistor 220 can be electrically connected to the second pixel electrode 321 of the second light emitting device. The above description of the first pixel electrode 311 and the first thin film transistor 210 can also be applied to the second pixel electrode 321 and the second thin film transistor 220. Figure 1 and Figure 7 As shown in FIG. 1, in a case where the second light emitting device is electrically connected to the second thin film transistor 220, the second pixel electrode 321 of the second light emitting device can be electrically connected to the second thin film transistor 220. The above description of the first pixel electrode 311 and the first thin film transistor 210 can also be applied to the second pixel electrode 321 and the second thin film transistor 220.

[0096] The second color filter layer 420 can cover or overlap a second area A2 corresponding to the second light emitting device of the upper substrate 400. In a case where the second area A2 corresponds to the second light emitting device, the second area A2 can overlap the second pixel electrode 321 when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. The first color filter layer 410 can include a 1-2 opening 412 corresponding to the second area A2. The dam 500 can include a second opening 502 corresponding to the second area A2. The second opening 502 of the dam 500 can include a portion overlapping the 1-2 opening 412 of the first color filter layer 410 and a portion located outside the 1-2 opening 412 when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. Accordingly, the 1-2 opening 412 of the first color filter layer 410 can include a portion overlapping the second opening 502 of the dam 500 and a portion located outside the second opening 502 when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400.

[0097] The second color light emitting layer included in the middle layer 303 of the second pixel PX2 can emit light within a second wavelength band in a range of, for example, about 450 nm to about 495 nm. The second pixel PX2 can emit the light within the second wavelength band to the outside through the upper substrate 400 without conversion. Accordingly, the second pixel PX2 can not include a quantum dot layer. As described above, because the quantum dot layer can not be included in the second opening 502 of the dam 500, a light-transmitting layer (e.g., a transparent layer) 425 including a light-transmitting resin can be located in the second opening 502. The light-transmitting layer 425 can include acrylic, benzocyclobutene (BCB), or hexamethyldisiloxane (HMDSO). If necessary, the light-transmitting layer 425 can not be included in the second opening 502 of the dam 500, unlike Figure 6 and Figure 1 the light-transmitting layer 425 can be included in the second opening 502 of the dam 500.

[0098] Figure 7 is a schematic conceptual view showing the light extraction area EAB from the perspective of a user of the display apparatus of Figure 6 and Figure 6 For example, Figure 3 shows the light extraction area EAB in the second pixel PX2 when viewed from the upper surface 400a of the upper substrate 400. As Figure 5 indicated in FIG. 4B, the light extraction area EAB in the second pixel PX2 can have an octagonal shape (or substantially an octagonal shape).

[0099] As a result of experiments conducted under different conditions, it can be seen that the light efficiency is the highest in the case where the length of the edge of the light extraction area EAB is the smallest in each pixel (or sub-pixel) using a quantum dot layer in the display apparatus. In order to minimize the length of the edge of the light extraction area EAB while the area of the light extraction area is uniform, the light extraction area EAB can be circular in a plan view. However, it is not easy to manufacture the light extraction area EAB to have a circular shape in a plan view during the manufacturing process of the display apparatus.

[0100] The display apparatus according to an embodiment can include a light extraction area EAB having a substantially octagonal shape in the second pixel PX2 in which the second light emitting device is located when viewed from the upper surface 400a of the upper substrate 400. The light extraction area EAB in the second pixel PX2 can be defined as a portion in which the 1-2th opening 412 of the first color filter layer 410 and the second opening 502 of the dam 500 overlap each other. Light emitted from the second color light emitting layer located under the 1-2th opening 412 and the second opening 502 can travel toward the upper substrate 400 via the second opening 502 of the dam 500, and the light can be emitted to the outside only through the 1-2th opening 412 of the first color filter layer 410. Accordingly, the display apparatus according to an embodiment can include a light extraction area EAB having an octagonal shape similar to a circular shape of the second pixel PX2 in the second pixel PX2 in which the second light emitting device is disposed when viewed from the upper surface 400a of the upper substrate 400. Accordingly, the length of the edge of the light extraction area EAB in the second pixel PX2 can be reduced, thereby improving light efficiency.

[0101] As described above, in order for the light extraction area EAB in the second pixel PX2 in which the second light emitting device is located when viewed in a direction perpendicular to the upper surface 400a of the upper substrate 400 to have an (approximately or substantially) octagonal shape similar to a circular shape, each of the 1-2th opening 412 of the first color filter layer 410 and the second opening 502 of the dam 500 can have a rectangular shape when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. As described above, the 1-2th opening 412 of the first color filter layer 410 and the second opening 502 of the dam 500 can each have a square shape when viewed in the direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. Figure 1 and Figure 7 As shown in FIGS. 11A and 11B, the 1-2th opening 412 of the first color filter layer 410 and the second opening 502 of the dam 500 can each have a square shape when viewed in the direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. If the first color filter layer 410 is rotated by 45° around the center of the second opening 502, the edge of the 1-2th opening 412 of the first color filter layer 410 can be parallel to the edge of the second opening 502 of the dam 500 when viewed in the direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. Accordingly, the light extraction area EAB in the second pixel PX2 in which the second light emitting device is located can have an octagonal shape similar to a circular shape when viewed in the direction perpendicular to the upper surface 400a of the upper substrate 400.

[0102] As shown in FIGS. 11A and 11B, the 1-2th opening 412 of the first color filter layer 410 and the second opening 502 of the dam 500 can each have a square shape when viewed in the direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. If the first color filter layer 410 is rotated by 45° around the center of the second opening 502, the edge of the 1-2th opening 412 of the first color filter layer 410 can be parallel to the edge of the second opening 502 of the dam 500 when viewed in the direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. Accordingly, the light extraction area EAB in the second pixel PX2 in which the second light emitting device is located can have an octagonal shape similar to a circular shape when viewed in the direction perpendicular to the upper surface 400a of the upper substrate 400. Figure 1 and Figure 7As shown, the display device according to the embodiment may have a third light-emitting device located in the third pixel PX3. The third light-emitting device may include an organic light-emitting device (OLED), which includes a third pixel electrode 331, a counter electrode 305, and an intermediate layer 303 disposed between the third pixel electrode 331 and the counter electrode 305 and including a second color light-emitting layer. In addition to the third light-emitting device, a third thin-film transistor 230 electrically connected to the third light-emitting device may be located on the lower substrate 100. The third thin-film transistor 230 may include a third drain electrode 235b, a third semiconductor layer 231, a third gate electrode 233, and a third source electrode 235a. Figure 2 and Figure 3 As shown, when the third light-emitting device is electrically connected to the third thin-film transistor 230, the third pixel electrode 331 of the third light-emitting device can be electrically connected to the third thin-film transistor 230. The above description of the first pixel electrode 311 and the first thin-film transistor 210 can also be applied to the description of the third pixel electrode 331 and the third thin-film transistor 230.

[0103] like Figure 1 As shown, the second color filter layer 420 may include a second-third opening 423, which exposes a third region A3 corresponding to the third light-emitting device of the upper substrate 400. When the third region A3 corresponds to the third light-emitting device, the third region A3 may overlap with the third pixel electrode 331 when viewed in a direction perpendicular to the upper substrate 400 (Z-axis direction). The first color filter layer 410 may also include a first-third opening 413 corresponding to the third region A3, such as... Figure 4 As shown in the diagram, the third color filter layer 430 can fill the second-third opening 423 of the second color filter layer 420, as shown in the diagram. Figure 7 , Figure 5 and Figure 6 As shown in the diagram, the third color filter layer 430 fills the first-to-third openings 413 of the first color filter layer 410. The third color filter layer 430 can transmit only light with wavelengths in the range of approximately 630 nm to approximately 780 nm.

[0104] The dam 500 may include a third opening 503 corresponding to the third region A3, such as Figure 1The third opening 503 of the dam 500 can include a portion overlapping the 2-3 opening 423 of the second color filter layer 420 and a portion located outside the 2-3 opening 423 when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. Accordingly, the 2-3 opening 423 of the second color filter layer 420 can include a portion overlapping the third opening 503 of the dam 500 and a portion located outside the third opening 503 when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400.

[0105] The third color quantum dot layer 435 can fill the third opening 503 of the dam 500. The third color quantum dot layer 435 can convert light in a second wavelength band generated from the intermediate layer 303 located on the third pixel electrode 331 into light in a third wavelength band. For example, in the case where light having a wavelength in a range of about 450 nm to about 495 nm is generated from the intermediate layer 303 located on the third pixel electrode 331, the third color quantum dot layer 435 can convert the light into light having a wavelength in a range of about 630 nm to about 780 nm. Accordingly, light having a wavelength in a range of about 630 nm to about 780 nm can be emitted from the third pixel PX3 to the outside via the upper substrate 400.

[0106] The third color quantum dot layer 435 can have a structure in which quantum dots are distributed in a resin. The quantum dots can include a semiconductor material such as cadmium sulfide (CdS), cadmium telluride (CdTe), zinc sulfide (ZnS), or indium phosphide (InP). Each quantum dot can have a size of several nanometers, and the wavelength of converted light can vary according to the size of the quantum dot. The third color quantum dot layer 435 can include any type of resin as long as the resin is a light-transmitting material. For example, a polymer resin such as acrylic, benzocyclobutene (BCB), or hexamethyldisiloxane (HMDSO) can be used as a material for forming the third color quantum dot layer 435.

[0107] Figure 7 is shown from the perspective of a user of a display device of Figure 6 and Figure 6 A schematic conceptual view of the light extraction area EAR is shown from the perspective of a user of a display device of Figure 2 A light extraction area EAR in the third pixel PX3 is shown when the light extraction area EAR is viewed from the upper surface 400a of the upper substrate 400. As shown in FIG. 13A, the light extraction area EAR in the third pixel PX3 can have a hexagonal shape. Figure 5 As shown in FIG. 13B, the light extraction area EAR in the third pixel PX3 can have an octagonal shape.

[0108] As a result of performing experiments under different conditions, it can be seen that light efficiency is highest in a case in which a length of an edge of the light extraction area EAR in each pixel (or sub-pixel) in which the quantum dot layer is used in the display apparatus is minimized. In order to minimize the length of the edge of the light extraction area EAR while the area of the light extraction area is uniform, the light extraction area EAR can be circular in a plan view. However, it is not easy to manufacture the light extraction area EAR to have a circular shape in a plan view during a manufacturing process of the display apparatus.

[0109] In the display apparatus according to the embodiment, the light extraction area EAR in the third pixel PX3 in which the third light emitting device is located can have an octagonal shape when viewed from the upper surface 400a of the upper substrate 400. The light extraction area EAR in the third pixel PX3 can be defined as a portion in which the 2-3th opening 423 of the second color filter layer 420 and the third opening 503 of the dam 500 overlap each other. The third color quantum dot layer 435 in the third opening 503 of the dam 500 can convert light emitted from the second color light emitting layer of the third light emitting device including the third pixel electrode 331 into light of a third wavelength band, and the converted light can be emitted to the outside only through the 2-3th opening 423 of the second color filter layer 420. Accordingly, in the display apparatus according to the embodiment, the light extraction area EAR of the third pixel PX3 in which the third light emitting device is disposed can have an octagonal shape similar to a circular shape when viewed from the upper surface 400a of the upper substrate 400. Accordingly, it is possible to reduce the length of the edge of the light extraction area EAR in the third pixel PX3, thereby improving light efficiency.

[0110] As described above, in order to make the light extraction area EAR in the third pixel PX3 in which the third light emitting device is located have an octagonal shape (approximately or substantially) similar to a circular shape when viewed in a direction perpendicular to the upper surface 400a of the upper substrate 400, each of the 2-3th opening 423 of the second color filter layer 420 and the third opening 503 of the dam 500 can have a rectangular shape when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. As described above, the light extraction area EAR in the third pixel PX3 in which the third light emitting device is located can have an octagonal shape similar to a circular shape when viewed from the upper surface 400a of the upper substrate 400. Accordingly, it is possible to reduce the length of the edge of the light extraction area EAR in the third pixel PX3, thereby improving light efficiency. Figure 1 and Figure 2As shown, when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400 (Z-axis direction), the second and third openings 423 of the second color filter layer 420 and the third opening 503 of the dam 500 can each have a square shape. Furthermore, when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400 (Z-axis direction), if the third opening 503 of the dam 500 is rotated 45° around its center, the edge of the second and third openings 423 of the second color filter layer 420 can be parallel to the edge of the third opening 503 of the dam 500. Therefore, when viewed in a direction perpendicular to the upper surface 400a of the upper substrate 400, the light extraction area EAR of the third pixel PX3 where the third light-emitting device is located can have an octagonal shape similar to a circle.

[0111] The second color filter layer 420 may include a second-first opening 421 exposing the first region A1 and a second-third opening 423 exposing the third region A3, such as Figure 7 , Figure 1 and Figure 7 As shown in the diagram. The second-first opening 421 can define the area of ​​the first color pixel (first pixel PX1), and the second-third opening 423 can define the area of ​​the third color pixel (third pixel PX3). The first-second opening 412 of the first color filter layer 410 can define the area of ​​the second color pixel (second pixel PX2).

[0112] At least two color filter layers overlap each other between the first pixel PX1, the first pixel PX2, and the third pixel PX3. Figure 8 and Figure 1 In this configuration, a first color filter layer 410 and a second color filter layer 420 may be located between first pixels PX1, PX2, and a third pixel PX3. The overlapping filter layers can serve as a black matrix. For example, when the first color filter layer 410 transmits only light with wavelengths in the range of approximately 450 nm to approximately 495 nm and the second color filter layer 420 transmits only light with wavelengths in the range of approximately 495 nm to approximately 570 nm, theoretically, light of any wavelength may be unable to pass through the overlapping first color filter layer 410 and second color filter layer 420. If desired, a third color filter layer 430 may overlap with any other filter layer between pixels, in addition to the first and second color filter layers 410 and 420.

[0113] As described above, as a result of experiments conducted under different conditions, it can be seen that the light efficiency is highest when the edge length of the light extraction region EAB in each pixel (or sub-pixel) using the quantum dot layer in the display device is minimized. Therefore, as shown in the schematic plan view illustrating part of a display device according to another embodiment... Figure 5 As shown, when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400, if the first opening 501 is rotated 45° around its center, the edge of the second-first opening 421 of the second color filter layer 420 can correspond to the edge of the first opening 501 in the dam 500. The light extraction region EAG of the first pixel PX1 can have an octagonal shape (or approximately or substantially octagonal), and the length of its edges can be reduced.

[0114] Similarly, when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400, if the second opening 502 is rotated 45° around its center, the edges of the first and second openings 412 of the first color filter layer 410 can correspond to the edges of the second opening 502 of the dam 500. Furthermore, when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400, if the third opening 503 is rotated 45° around its center, the edges of the second and third openings 423 of the second color filter layer 420 can correspond to the edges of the third opening 503 of the dam 500. Therefore, the light extraction region EAB in the second pixel PX2 and the light extraction region EAR in the third pixel PX3 can each have an octagonal shape, and the length of their edges can be reduced.

[0115] like Figure 7 , Figure 9 and Figure 10 As shown, when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400 (Z-axis direction), the area of ​​the first-3 openings 413 in the first color filter layer 410 can be larger than the area of ​​the second-3 openings 423 in the second color filter layer 420. The third pixel PX3 can emit light within a third wavelength band to the outside via the upper substrate 400, and therefore, the second-3 openings 423 of the second color filter layer 420 can define the area of ​​the third color pixel (third pixel PX3). Considering tolerances during the manufacturing process, the edges of the first-3 openings 413 of the first color filter layer 410 and the edges of the second-3 openings 423 in the second color filter layer 420 do not need to correspond to each other. Therefore, when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400 (Z-axis direction), the edges of the second-3 openings 423 in the second color filter layer 420 can be within the first-3 openings 413 of the first color filter layer 410.

[0116] If necessary, as shown in Figure 9 and Figure 10 , edges of the 1st-3rd openings 413 in the first color filter layer 410 can correspond to edges of the 2nd-3rd openings 423 in the second color filter layer 420. Figure 9 is a schematic plan view showing a portion of a display apparatus according to another embodiment, and Figure 1 is a schematic cross-sectional view of the display apparatus taken along lines A”-B”, B”-C”, and C”-D” of Figure 4 In this case, when viewed from a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400, the area of the 1st-3rd openings 413 in the first color filter layer 410 can be equal to the area of the 2nd-3rd openings 423 in the second color filter layer 420.

[0117] In Figure 7 , Figure 11 and Figure 12 , the third color filter layer 430 can correspond to only the third pixel PX3. However, embodiments are not limited thereto. For example, as shown in Figure 11 and Figure 12 , the third color filter layer 430 can be located on the entire surface of the upper substrate 400 similar to the first color filter layer 410 or the second color filter layer 420, and can have a 3rd-1 opening 431 corresponding to the first area A1 and a 3rd-2 opening 432 corresponding to the second area A2. Figure 11 is a schematic plan view showing a portion of a display apparatus according to another embodiment, and Figure 11 is a schematic cross-sectional view of the display apparatus taken along lines A”'-B”', B”'-C”', and C”'-D”' of Figure 12

[0118] ​In this case, when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400, the area of the 3-1 opening 431 in the third color filter layer 430 can be equal to or greater than that of the 2-1 opening 421 of the second color filter layer 420, and the area of the 3-2 opening 432 of the third color filter layer 430 can be equal to or greater than that of the 1-2 opening 412 of the first color filter layer 410, considering tolerances during a manufacturing process. The first pixel PX1 can emit light having a first color wavelength to the outside via the upper substrate 400, and the second pixel PX2 can emit light having a second color wavelength to the outside via the upper substrate 400. Accordingly, the 2-1 opening 421 of the second color filter layer 420 can be defined as a region of a first color pixel (the first pixel PX1), and the 1-2 opening 412 of the first color filter layer 410 can be defined as a region of a second color pixel (the second pixel PX2). When viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400 (or in a plan view), an edge of the 2-1 opening 421 can be located in the 3-1 opening 431, and an edge of the 1-2 opening 412 can be located in the 3-2 opening 432, as shown in Figure 13 and Figure 5 .

[0119] If necessary, as shown in FIG. 7, which is a schematic plan view showing a portion of a display apparatus according to another embodiment, an edge of the 1-2 opening 412 of the first color filter layer 410 can correspond to an edge of the 3-2 opening 432 of the third color filter layer 430, and an edge of the 2-1 opening 421 of the second color filter layer 420 can correspond to an edge of the 3-1 opening 431 of the third color filter layer 430. Figure 8

[0120] In Figure 9 , Figure 14 and Figure 15 , it is shown that the 2-1 opening 421, the 1-2 opening 412, and the 1-3 opening 413 are located on a straight line. However, embodiments are not limited thereto. For example, as shown in FIG. 8, which is a schematic plan view showing a portion of a display apparatus according to another embodiment, a center of the 1-2 opening 412 can be outside a straight line connecting a center of the 2-1 opening 421 and a center of the 1-3 opening 413. Figure 15

[0121] ​​The first color filter layer 410, the second color filter layer 420, and the third color filter layer 430 can be used to reduce external light reflection in the display apparatus. For example, in a case where external light reaches the first color filter layer 410, only light having a predetermined wavelength as described above can pass through the first color filter layer 410, and light having other wavelengths can be absorbed by the first color filter layer 410. Accordingly, only light having a predetermined wavelength as described above of the external light incident to the display apparatus can pass through the first color filter layer 410, and a portion of the light can be reflected by the counter electrode 305 or the first pixel electrode 311 below the first color filter layer 410 and exit to the outside. Accordingly, only a portion of the external light incident to a space where the first pixel PX1 is located can be reflected to the outside, and thus, external light reflection can be reduced. The above description can also be applied to the second color filter layer 420 and the third color filter layer 430.

[0122] In the above description, the second wavelength band can be in a range of about 450 nm to about 495 nm, the first wavelength band can be in a range of about 495 nm to about 570 nm, and the third wavelength band can be in a range of about 630 nm to about 780 nm. However, embodiments are not limited thereto. For example, the first wavelength band can be in a range of about 630 nm to about 780 nm, and the third wavelength band can be in a range of about 495 nm to about 570 nm.

[0123] Because external light of the second wavelength band (i.e., about 450 nm to about 495 nm) has the greatest intensity, the second color filter layer 420 of the first color filter layer 410, the second color filter layer 420, and the third color filter layer 430 can be closest to the lower surface 400b of the upper substrate 400, thereby creating a similar environment to external light. A color filter layer that transmits light having a wavelength band in a range of about 495 nm to about 570 nm can be relatively closer to the lower surface 400b of the upper substrate 400 than a color filter layer that transmits light having a wavelength band in a range of about 630 nm to about 780 nm. This is because the human eye is more sensitive to light having a wavelength band in a range of about 495 nm to about 570 nm.

[0124] Figure 15 FIG. 4 is a schematic plan view illustrating a portion of a display apparatus according to an embodiment. Figure 1A lower substrate 100 included in a display device is shown. The lower substrate 100 can include a display area DA, and the display area DA can have four edges. In detail, the display area DA can include a first edge EG1, a second edge EG2 facing the first edge EG1 and parallel to the first edge EG1, a third edge EG3 connecting one end of the first edge EG1 in a Y-axis direction to one end of the second edge EG2 in the Y-axis direction, and a fourth edge EG4 connecting an opposite end of the first edge EG1 in the Y-axis direction to an opposite end of the second edge EG2 in the Y-axis direction. For example, the first edge EG1 and the second edge EG2 can be parallel to the Y-axis, and the third edge EG3 and the fourth edge EG4 can be parallel to the X-axis.

[0125] In Figure 7 , the lower substrate 100 can have a shape similar to that of the display area DA. However, embodiments are not limited thereto. For example, a portion of the lower substrate 100 can be curved.

[0126] The first to third light emitting devices can be located on the lower substrate 100, e.g., in the display area DA of the lower substrate 100. The first to third light emitting devices can include an emission layer that emits light within the same wavelength band. For example, as described above, the first to third light emitting devices can be organic light emitting devices, and each of the first to third light emitting devices can include an intermediate layer 303 including a second color light emitting layer. The upper substrate 400 can be located above the lower substrate 100 such that the first to third light emitting devices are disposed between the upper substrate 400 and the lower substrate 100, as shown, for example, in Figure 10 、 Figure 12 、 Figure 16 、 Figure 8 and Figure 8 .

[0127] The second color filter layer 420 can be located on a surface of the upper substrate 400 facing the lower substrate 100. The second color filter layer 420 can include a 2-1 opening 421 and a 2-3 opening 423, and the shapes and positions of the 2-1 opening 421 and the 2-3 opening 423 can be the same as those of the 2-1 opening 421 and the 2-3 opening 423 shown in Figure 1 . For example, when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400, the 2-1 opening 421 can overlap the first light emitting device, but an edge of the 2-1 opening 421 can not be parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4. The 2-3 opening 423 can overlap the third light emitting device, but an edge of the 2-3 opening 423 can not be parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4.

[0128] The first color filter layer 410 can be located on a surface of the upper substrate 400 facing the lower substrate 100. The first color filter layer 410 can fill the 2-1 opening 421 of the second color filter layer 420. The first color filter layer 410 can include the 1-2 opening 412 and the 1-3 opening 413, and the shapes and positions of the 1-2 opening 412 and the 1-3 opening 413 can be the same as those of the 1-2 opening 412 and the 1-3 opening 413 shown in FIG. 1B. Figure 7

[0129] The third color filter layer 430 can be located on a surface of the upper substrate 400 facing the lower substrate 100. The third color filter layer 430 can fill the 2-3 opening 423 and the 1-3 opening 413.

[0130] The dam 500 can be located between the first color filter layer 410, the second color filter layer 420, and the third color filter layer 430 and the lower substrate 100. When viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400, the dam 500 can include a first opening 501, a second opening 502, and a third opening 503. The first opening 501 can overlap the first light emitting device and can have edges parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4. The second opening 502 can overlap the second light emitting device and can have edges parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4. The third opening 503 can overlap the third light emitting device and can have edges parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4.

[0131] The quantum dot layer can fill the first opening 501, the second opening 502, and the third opening 503. For example, as shown in FIGS. 1B and 1C, the quantum dot layer can include a first color quantum dot layer 415 filling the first opening 501 and a third color quantum dot layer 435 filling the third opening 503. Figure 8 Figure 9

[0132] As shown in FIG. 1C, the first color quantum dot layer 415 can include a first color quantum dot 415a having a first color, and the third color quantum dot layer 435 can include a third color quantum dot 435a having a third color.​​​Figure 9 As shown in FIG. 20, a virtual straight line IL1 connecting the center of the 2-1 opening 421 of the second color filter layer 420 to the center of the 2-3 opening 423 can not be parallel to the first edge EG1 and the third edge EG3 of the display area DA. A virtual straight line IL1 connecting the center of the 1-2 opening 412 of the first color filter layer 410 to the center of the 1-3 opening 413 can not be parallel to the first edge EG1 and the third edge EG3 of the display area DA. The reason is that the edges of each of the first opening 501, the second opening 502, and the third opening 503 of the dam 500 are parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4.

[0133] As shown in FIG. 20, a virtual straight line IL1 connecting the center of the 2-1 opening 421 of the second color filter layer 420 to the center of the 2-3 opening 423 can not be parallel to the first edge EG1 and the third edge EG3 of the display area DA. A virtual straight line IL1 connecting the center of the 1-2 opening 412 of the first color filter layer 410 to the center of the 1-3 opening 413 can not be parallel to the first edge EG1 and the third edge EG3 of the display area DA. The reason is that the edges of each of the first opening 501, the second opening 502, and the third opening 503 of the dam 500 are parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4. Figure 14 As shown in FIG. 20, a virtual straight line IL1 connecting the center of the 2-1 opening 421 of the second color filter layer 420 to the center of the 2-3 opening 423 can not be parallel to the first edge EG1 and the third edge EG3 of the display area DA. A virtual straight line IL1 connecting the center of the 1-2 opening 412 of the first color filter layer 410 to the center of the 1-3 opening 413 can not be parallel to the first edge EG1 and the third edge EG3 of the display area DA. The reason is that the edges of each of the first opening 501, the second opening 502, and the third opening 503 of the dam 500 are parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4.

[0134] Figure 16 As shown in FIG. 20, a virtual straight line IL1 connecting the center of the 2-1 opening 421 of the second color filter layer 420 to the center of the 2-3 opening 423 can not be parallel to the first edge EG1 and the third edge EG3 of the display area DA. A virtual straight line IL1 connecting the center of the 1-2 opening 412 of the first color filter layer 410 to the center of the 1-3 opening 413 can not be parallel to the first edge EG1 and the third edge EG3 of the display area DA. The reason is that the edges of each of the first opening 501, the second opening 502, and the third opening 503 of the dam 500 are parallel to the first edge EG1, the second edge EG2, the third edge EG3, and the fourth edge EG4. Figure 1

[0135] In either case, each of the 2-1 opening 421, the 2-3 opening 423, the 1-2 opening 412, and the 1-3 opening 413 can have a rectangular shape when viewed in a direction (Z-axis direction) perpendicular to the lower surface 400b of the upper substrate 400. If the first opening 501 is rotated by 45° around the center of the first opening 501, the edges of each of the 2-1 opening 421, the 2-3 opening 423, the 1-2 opening 412, and the 1-3 opening 413 can be parallel to the first opening 501 of the dam 500.

[0136] ​​The area of the 2-3 opening 423 of the second color filter layer 420 can be equal to the area of the 2-1 opening 421 when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400 (Z-axis direction). For another example, the area of the 2-3 opening 423 of the second color filter layer 420 can be equal to the area of the 1-2 opening 412 of the first color filter layer 410 when viewed in a direction perpendicular to the lower surface 400b of the upper substrate 400 (Z-axis direction).

[0137] Figure 16 is a schematic cross-sectional view illustrating a portion of a display apparatus according to another embodiment. The display apparatus according to this embodiment can differ from the display apparatus described above with reference to Figure 8 and the like in that the display apparatus can further include an auxiliary electrode AE. For example, the auxiliary electrode AE and the pixel electrode 311 can be located on the same layer, etc., and can be simultaneously manufactured by using the same material to have the same layered structure as the layered structure of the first pixel electrode 311, etc. The pixel defining layer 150 can have an opening exposing the auxiliary electrode AE. The intermediate layer 303 can also be located on the auxiliary electrode AE, and thus, the auxiliary electrode AE can be irradiated with a laser beam to remove the intermediate layer 303 located on the auxiliary electrode AE before forming the counter electrode 305. Next, in the case of forming the counter electrode 305, the counter electrode 305 can electrically contact the auxiliary electrode AE as shown in Figure 9 . As described above, the voltage drop of the counter electrode 305 integrally formed in the display area DA can be prevented or significantly reduced. The laser-drilled position LD at which the counter electrode 305 electrically contacts the auxiliary electrode AE can be located between the openings of the color filter layer, e.g., between the first opening 501, the second opening 502, and the third opening 503 of the dam 500, as shown in ​ and ​ .

[0138] According to the above-described embodiments of the present disclosure, a display apparatus having improved light efficiency can be implemented. However, the scope of the present disclosure is not limited to the above effects.

[0139] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as being applicable to other similar features or aspects in other embodiments. While embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details can be made therein without departing from the spirit and scope as defined by the following claims.

Claims

1. A display device, wherein, The display device includes: a lower substrate; a first light emitting device on the lower substrate, the first light emitting device including a second color light emitting layer; an upper substrate above the lower substrate, the first light emitting device disposed between the upper substrate and the lower substrate, the upper substrate including a first area corresponding to the first light emitting device; a second color filter layer on a lower surface of the upper substrate, wherein the lower surface faces the lower substrate, and the second color filter layer includes a first opening exposing the first area; a first color filter layer including a portion filling the first opening and a portion on a lower surface of the second color filter layer, wherein the lower surface of the second color filter layer faces the lower substrate; a dam between the first color filter layer and the second color filter layer and the lower substrate, the dam including a second opening corresponding to the first area; and a first color quantum dot layer filling the second opening, wherein the second opening includes a portion overlapping the first opening in a plan view and a portion outside the first opening, wherein the first opening includes a portion overlapping the second opening in the plan view and a portion outside the second opening.

2. The display device of claim 1, wherein, Each of the first opening and the second opening has a rectangular shape in the plan view.

3. The display device of claim 1, wherein, Each of the first opening and the second opening has a square shape in the plan view.

4. The display device of claim 3, wherein, In the plan view, if the second opening is rotated by 45° around a center of the second opening, edges of the second opening are parallel to edges of the first opening.

5. The display device of claim 3, wherein, In the plan view, if the second opening is rotated by 45° around a center of the second opening, edges of the second opening correspond to edges of the first opening.

6. The display device of claim 1, wherein, The display device further includes a second light emitting device on the lower substrate, the second light emitting device including a second color light emitting layer, wherein the second color filter layer overlaps a second area of the upper substrate, the second area corresponding to the second light emitting device, the first color filter layer includes a third opening corresponding to the second area, the dam includes a fourth opening corresponding to the second area, and the fourth opening includes a portion overlapping the third opening in the plan view and a portion outside the third opening.

7. The display device of claim 6, wherein, The third opening includes a portion overlapping the fourth opening in the plan view and a portion outside the fourth opening.

8. The display device of claim 7, wherein, Each of the third opening and the fourth opening has a rectangular shape in the plan view.

9. The display device of claim 7, wherein, Each of the third opening and the fourth opening has a square shape in the plan view.

10. The display device of claim 9, wherein, In the plan view, if the fourth opening is rotated by 45° around a center of the fourth opening, edges of the fourth opening are parallel to edges of the third opening.

11. The display device of claim 9, wherein, In the plan view, if the fourth opening is rotated by 45° around a center of the fourth opening, edges of the fourth opening correspond to edges of the third opening. 12.The display device of claim 6, further comprising a third light emitting device on the lower substrate, the third light emitting device comprising a second color light emitting layer, wherein, the second color filter layer comprises a fifth opening exposing a third region of the upper substrate, the third region corresponding to the third light emitting device, the first color filter layer comprises a sixth opening corresponding to the third region, the dam comprises a seventh opening corresponding to the third region, and the seventh opening comprises a portion overlapping the fifth opening and a portion outside the fifth opening in the plan view.

13. The display device of claim 12, wherein, the fifth opening comprises a portion overlapping the seventh opening and a portion outside the seventh opening in the plan view.

14. The display device of claim 13, wherein, each of the fifth opening and the seventh opening has a rectangular shape in the plan view.

15. The display device of claim 13, wherein, each of the fifth opening and the seventh opening has a square shape in the plan view.

16. The display device of claim 15, wherein, in the plan view, if the seventh opening is rotated by 45° around a center of the seventh opening, edges of the seventh opening are parallel to edges of the fifth opening.

17. The display device of claim 15, wherein, in the plan view, if the seventh opening is rotated by 45° around a center of the seventh opening, edges of the seventh opening correspond to edges of the fifth opening.

18. The display device of claim 12, wherein, in the plan view, an area of the sixth opening is equal to or greater than an area of the fifth opening.

19. The display device of claim 12, wherein, in the plan view, edges of the sixth opening correspond to edges of the fifth opening.

20. The display device of claim 12, wherein, in the plan view, edges of the fifth opening are located in the sixth opening.

21. The display device of claim 12, wherein, the display device further comprises: a third color filter layer filling the fifth opening; and a third color quantum dot layer filling the seventh opening.

22. The display device of claim 21, wherein, the third color filter layer comprises: an eighth opening corresponding to the first region; and a ninth opening corresponding to the second region.

23. The display device of claim 22, wherein, in the plan view, an area of the eighth opening is equal to or greater than an area of the first opening, and an area of the ninth opening is equal to or greater than an area of the third opening.

24. The display device of claim 22, wherein, in the plan view, edges of the eighth opening correspond to edges of the first opening, and edges of the ninth opening correspond to edges of the third opening.

25. The display device of claim 22, wherein, in the plan view, an edge of the first opening is located in the eighth opening, and an edge of the third opening is located in the ninth opening.

26. A display device, wherein, the display device comprises: a lower substrate comprising a display region, the display region comprising a first edge, a second edge facing the first edge, a third edge connecting one end of the first edge to one end of the second edge, and a fourth edge connecting the other end of the first edge to the other end of the second edge; first, second, and third light emitting devices in the display region on the lower substrate, each of the first, second, and third light emitting devices comprising an emission layer emitting light having a wavelength within a wavelength band, and a first color filter layer on the lower substrate, the first color filter layer comprising a first opening corresponding to the first light emitting device, a second opening corresponding to the second light emitting device, and a third opening corresponding to the third light emitting device. an upper substrate located above the lower substrate, the first light emitting device, the second light emitting device, and the third light emitting device disposed between the upper substrate and the lower substrate; a second color filter layer located on a lower surface of the upper substrate, the lower surface of the upper substrate facing the lower substrate, wherein the second color filter layer includes a first opening overlapping the first light emitting device and including edges that are not parallel to the first edge, the second edge, the third edge, and the fourth edge, and a second opening overlapping the third light emitting device and including edges that are not parallel to the first edge, the second edge, the third edge, and the fourth edge; a first color filter layer located on the lower surface of the upper substrate, wherein the first color filter layer fills the first opening and includes a third opening overlapping the second light emitting device in a plan view and including edges that are not parallel to the first edge, the second edge, the third edge, and the fourth edge, and a fourth opening overlapping the third light emitting device in the plan view and including edges that are not parallel to the first edge, the second edge, the third edge, and the fourth edge; a third color filter layer located on the lower surface of the upper substrate, the third color filter layer filling the second opening and the fourth opening; a dam located between the first color filter layer, the second color filter layer, and the third color filter layer and the lower substrate and including a fifth opening overlapping the first light emitting device in the plan view and including edges parallel to the first edge, the second edge, the third edge, and the fourth edge, a sixth opening overlapping the second light emitting device in the plan view and including edges parallel to the first edge, the second edge, the third edge, and the fourth edge, and a seventh opening overlapping the third light emitting device in the plan view and including edges parallel to the first edge, the second edge, the third edge, and the fourth edge; and a quantum dot layer filling two of the fifth opening, the sixth opening, and the seventh opening.

27. The display device of claim 26, wherein each of the first light emitting device, the second light emitting device, and the third light emitting device includes a second color light emitting layer, and the quantum dot layer includes a first color quantum dot layer filling the fifth opening and a third color quantum dot layer filling the seventh opening.

28. The display device of claim 26, wherein, a virtual straight line connecting a center of the first opening to a center of the second opening is not parallel to the first edge and the third edge.

29. The display device of claim 26, wherein at least one of the edges of the first opening and at least one of the edges of the second opening are located on a same virtual straight line, and the first color quantum dot layer and the third color quantum dot layer are located on the same virtual straight line. The virtual straight line is not parallel to the first edge and the third edge.

30. The display device of claim 29, wherein, At least one of the edges of the third opening is located on the virtual straight line.

31. The display device of claim 29, wherein, None of the edges of the third opening is located on the virtual straight line.

32. The display device of claim 26, wherein, Each of the first, second, third, and fourth openings has a rectangular shape in the plan view.

33. The display device of claim 26, wherein, In the plan view, edges of the fifth opening are parallel to the edges of each of the first, second, third, and fourth openings if the fifth opening is rotated 45° about a center of the fifth opening.

34. The display device of claim 26, wherein, In the plan view, an area of the second opening is equal to an area of the first opening.

35. The display device of claim 26, wherein, In the plan view, an area of the second opening is equal to an area of the third opening.

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