Display device and method of manufacturing same

Abstract

The invention relates to a display device and a method of manufacturing the same. The display device includes: a base substrate; a partition wall disposed on the base substrate and provided with a first opening; a first arrangement electrode disposed in the first opening; a second arrangement electrode disposed in the first opening and spaced apart from the first arrangement electrode; and a first light emitting layer disposed in the first opening. The first light-emitting layer includes: a first portion including a first quantum dot and an organic light-emitting material and disposed adjacent to the first arrangement electrode; and a second portion including an organic light emitting material and disposed adjacent to the second arrangement electrode.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0165418 filed in the Korean Intellectual Property Office (KIPO) on November 24, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a display device including quantum dots and a method of manufacturing the display device. Background Art

[0004] Various display devices applied to multimedia devices such as televisions, mobile phones, tablet computers, navigation devices, and game devices are being developed. The display devices employ so-called self-emissive display elements that display images by causing light-emitting materials including organic compounds to emit light.

[0005] Light-emitting elements that employ quantum dots as their light-emitting materials to improve the color reproducibility of display devices are also being developed, and methods for improving the resolution of display devices are required. Summary of the invention

[0006] The present disclosure provides a display device including quantum dots.

[0007] The present disclosure provides a method of manufacturing a display device.

[0008] According to an embodiment of the present disclosure, a display device may include: a base substrate; a partition wall, which is arranged on the base substrate and provided with a first opening; a first arrangement electrode, which is arranged in the first opening; a second arrangement electrode, which is arranged in the first opening and is separated from the first arrangement electrode; and a first light-emitting layer, which is arranged in the first opening.

[0009] The first light emitting layer may include: a first portion including first quantum dots and an organic light emitting material and disposed adjacent to the first arrangement electrode; and a second portion including an organic light emitting material and disposed adjacent to the second arrangement electrode.

[0010] The first quantum dots may have polarity, and the organic light emitting material may not have polarity.

[0011] The first portion may emit light having a first color, and the second portion may emit light having a second color different from the first color.

[0012] When the first quantum dot has a positive charge, the first arrangement electrode can receive a voltage lower than the voltage applied to the second arrangement electrode, and when the first quantum dot has a negative charge, the second arrangement electrode can receive a voltage lower than the voltage applied to the first arrangement electrode.

[0013] The display device may further include: a first-first lower electrode, which is arranged on the base substrate and is at least partially exposed through the first opening of the partition wall; a first-second lower electrode, which is arranged on the base substrate and is at least partially exposed through the first opening of the partition wall; and a lower electrode insulating portion, which is arranged between the first-first lower electrode and the first-second lower electrode and on the base substrate to insulate the first-first lower electrode from the first-second lower electrode.

[0014] The display device may further include: a first arrangement insulating portion disposed between the first-first lower electrode and the first arrangement electrode; and a second arrangement insulating portion disposed between the first-second lower electrode and the second arrangement electrode.

[0015] The display device may further include: an upper electrode disposed on the first light emitting layer and the partition wall.

[0016] The display device may further include: a hole transport region disposed between the first-first lower electrode and the first light emitting layer and between the first-second lower electrode and the first light emitting layer; and an electron transport region disposed between the first light emitting layer and the upper electrode.

[0017] The first-first lower electrode may have a thickness different from that of the first-second lower electrode, and the first portion of the first light emitting layer may have a thickness different from that of the second portion of the first light emitting layer.

[0018] A distance from an upper surface of the first-first lower electrode to a lower surface of the upper electrode may correspond to a resonance thickness of light having a first color, and a distance from an upper surface of the first-second lower electrode to a lower surface of the upper electrode may correspond to a resonance thickness of light having a second color.

[0019] In a plan view, the first arrangement electrode and the second arrangement electrode may at least partially overlap a side surface of the partition wall defining the first opening.

[0020] The display device may further include: a first conductive line contacting the first arrangement electrode; and a second conductive line contacting the second arrangement electrode.

[0021] The voltage applied to the first arrangement electrode through the first conductive line may be different from the voltage applied to the second arrangement electrode through the second conductive line.

[0022] The display device may further include: a second light emitting layer. The partition wall may be further provided with a second opening, the second light emitting layer may be disposed in the second opening and include a second quantum dot, and the second light emitting layer may emit light having a third color different from the first color and the second color.

[0023] In a plan view, the first opening may have a size larger than a size of the second opening.

[0024] The display device may further include: a light control layer disposed on the base substrate. The light control layer may include a light shielding portion, a first filter transmitting light having a first color, a second filter transmitting light having a second color, and a third filter transmitting light having a third color.

[0025] The first quantum dot may include: a core; at least one shell surrounding the core; and a ligand disposed outside the shell, and the shell or the ligand may have polarity.

[0026] The first quantum dot may have a first energy level, and the organic light emitting material may have a second energy level higher than the first energy level.

[0027] According to an embodiment of the present disclosure, a method for manufacturing a display device may include: forming a base substrate, a first-first lower electrode on the base substrate, a first-second lower electrode on the base substrate and spaced apart from the first-first lower electrode, and a lower electrode insulating portion between the first-first lower electrode and the first-second lower electrode; forming a partition wall, forming an opening through the partition wall to expose at least a portion of each of the first-first lower electrode and the first-second lower electrode; forming a first arrangement electrode and a second arrangement electrode spaced apart from the first arrangement electrode in the opening; providing a liquid luminescent composition including quantum dots and an organic luminescent material to the opening; and forming an electric field between the first arrangement electrode and the second arrangement electrode to move the quantum dots in a direction closer to the first arrangement electrode.

[0028] The method may further include drying the liquid light-emitting composition. Drying the liquid light-emitting composition and forming the electric field may be performed by the same process.

[0029] According to the above, two different lights are emitted from one light emitting layer included in the display device, and accordingly, the resolution of the display device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other advantages of the present disclosure will become apparent by referring to the following detailed description when considered in conjunction with the accompanying drawings, in which:

[0031] Figure 1 is a perspective view of a display device according to an embodiment of the present disclosure;

[0032] Figure 2 yes Figure 1 An exploded perspective view of the display device shown in FIG.

[0033] Figure 3 It is along Figure 2 A schematic cross-sectional view of the display panel taken along line II';

[0034] Figure 4 is a plan view of a display panel according to an embodiment of the present disclosure;

[0035] Figure 5 yes Figure 4 An enlarged plan view of area AA';

[0036] Figure 6 It is along Figure 5 A schematic cross-sectional view taken along line II-II';

[0037] Figure 7 yes Figure 6 An enlarged schematic cross-sectional view of region BB';

[0038] Figure 8 is a schematic cross-sectional view of a portion of a display device according to an embodiment of the present disclosure;

[0039] Fig. 9 is a schematic diagram showing the structure of a quantum dot according to an embodiment of the present disclosure;

[0040] Fig.10 is a flowchart illustrating a method of manufacturing a display device according to an embodiment of the present disclosure; and

[0041] FIG. 11A to FIG. 11F 2 is a schematic cross-sectional view illustrating a process of a method of manufacturing a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] The present disclosure can be variously modified and implemented in a variety of different forms, and therefore, embodiments will be illustrated in the drawings and described in detail below. However, the present disclosure should not be limited to the specific disclosed form, but should be interpreted as including all modifications, equivalents or replacements included in the spirit and scope of the present disclosure.

[0043] When an element or layer is referred to as being "on," "connected to," or "coupled to" another element or layer, it may be directly on, directly connected to, or directly coupled to, or there may be intervening elements or layers. However, when an element or layer is referred to as being "directly" "on," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. For this purpose, the term "connected" may refer to a physical, electrical, and / or fluid connection with or without intervening elements. Additionally, when an element is referred to as being "in contact with" or "contacting" another element, etc., the element may be "electrically in contact with" or "in physical contact with" another element, or "indirectly in contact with" or "directly in contact with" another element.

[0044] Throughout the text, the same reference numerals refer to the same elements. In the accompanying drawings, the thickness, ratio and size of the components are exaggerated for the effective description of the technical content. In the specification and claims, for the purpose of its meaning and interpretation, the phrase "at least one of..." is intended to include the meaning of "at least one selected from the group of...". For example, "at least one of A and B" can be understood to mean "A, B or A and B". In the specification and claims, for the purpose of its meaning and interpretation, the term "and / or" is intended to include any combination of the terms "and" and "or". For example, "A and / or B" can be understood to mean "A, B or A and B". The terms "and" and "or" can be used in conjunction or separation, and can be understood to be equivalent to "and / or".

[0045] It will be understood that although the terms "first", "second", etc. can be used in this article to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, without departing from the teachings of the present disclosure, the first element discussed below can be referred to as the second element. As used in this article, the singular forms "a", "an", and "the / said" are intended to also include plural forms unless the context clearly indicates otherwise.

[0046] For ease of description, spatially relative terms such as “below,” “beneath,” “lower,” “above,” and “upper” may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures.

[0047] It will be further understood that when used in this specification, the terms "includes" and / or "comprising" and variations thereof specify the presence of stated features, integers, steps, operations, elements, parts and / or groups thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups thereof.

[0048] As used herein, "about" or "approximately" includes the stated value and means within an acceptable range of deviation for that particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, 20%, 10%, 5% of the stated value.

[0049] Unless otherwise defined, all terms (including technical and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant field, and will not be interpreted in an idealized or overly formal sense unless explicitly defined as such in this article.

[0050] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0051] Figure 1 is a perspective view of a display device DD according to an embodiment of the present disclosure. Figure 2 yes Figure 1 0 is an exploded perspective view of a display device DD shown in FIG.

[0052] The display device DD can be activated in response to an electrical signal and can display an image. The display device DD can be applied in various embodiments to provide images to various users. For example, the display device DD can be applied to large electronic products such as televisions or outdoor billboards. For example, the display device DD can be applied to small and medium-sized electronic products such as monitors, mobile phones, tablet computers, navigation units, game units, etc. However, the present disclosure is not limited thereto, and the display device DD can be applied to other electronic products as long as they do not depart from the present disclosure.

[0053] refer to Figure 1 In a plan view, the display device DD may have a rectangular shape with short sides extending in the first direction DR1 and long sides extending in the second direction DR2, however, the shape of the display device DD should not be limited thereto or thereby. The display device DD may have various shapes such as a circular shape, a polygonal shape, etc.

[0054] The display device DD may display an image IM toward a third direction DR3 through a display surface FS substantially parallel to a plane defined by the first direction DR1 and the second direction DR2. The third direction DR3 may be substantially parallel to a normal direction of the display surface FS. The display surface FS on which the image IM is displayed may correspond to a front surface of the display device DD. The image IM may include a video and a still image. Figure 1 An application icon is shown as an example of the image IM.

[0055] In the present disclosure, the front (or upper) surface and the rear (or lower) surface of each member or each unit of the display device DD can be defined relative to the direction in which the image IM is displayed. The front surface and the rear surface can be opposite to each other in the third direction DR3, and the normal direction of each of the front surface and the rear surface can be substantially parallel to the third direction DR3. The separation distance between the front surface and the rear surface can correspond to the thickness of the member (or unit) in the third direction DR3. In the following description, the expression "when viewed in a plane" or "in a plan view" means a state viewed in the third direction DR3. In the following description, the expression "when viewed in a cross section" or "in a cross-sectional view" means a state viewed in the first direction DR1 or the second direction DR2. The directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3 can be relative to each other and can be changed to other directions.

[0056] The display surface FS of the display device DD, through which the image IM is displayed, may be connected to the front surface of the display device DD and the window WP (refer to Figure 2 ) corresponds to the front surface FS of the display device DD. Accordingly, the display surface and the front surface of the display device DD and the front surface of the window WP will be assigned the same reference numerals. Although not shown in the drawings, the display device DD may include a foldable display device including a folding area and a non-folding area or a bendable display device including at least one bending portion.

[0057] refer to Figure 2 , the display device DD may include a window WP, a display panel DP and a housing HAU.

[0058] The window WP may include an optically transparent insulating material. The window WP may include a transmissive area TA and a bezel area BZA. A user may view an image IM provided through the transmissive area TA corresponding to the front surface FS of the window WP.

[0059] Figure 1 and Figure 2 It is illustrated that the transmission area TA has a quadrangular shape with rounded vertices, however, the present disclosure is not limited thereto. The transmission area TA may have various shapes and should not be particularly limited.

[0060] The transmission area TA may be an optically transparent area. The frame area BZA may be a region having a relatively lower transmittance than the transmission area TA. The frame area BZA may have a color. In a plan view, the frame area BZA may be disposed adjacent to the transmission area TA and may surround the transmission area TA. The frame area BZA may define the shape of the transmission area TA. However, the present disclosure should not be limited to or thereby, and the frame area BZA may be disposed adjacent to only one side of the transmission area TA or may be omitted.

[0061] The display panel DP may be disposed under the window WP. The display panel DP may have a configuration that substantially generates an image IM. The display panel DP may display the image IM through the display surface IS, and the user may view the image IM through the transmission area TA. The display panel DP may include a display area DA and a non-display area NDA. The display area DA may be activated in response to an electrical signal. The non-display area NDA may be covered by a frame area BZA. The non-display area NDA may be defined as being adjacent to the display area DA. In a plan view, the non-display area NDA may surround the display area DA.

[0062] The housing HAU may accommodate the display panel DP. The housing HAU may cover the display panel DP, and the upper surface of the display panel DP (i.e., the display surface IS) may be exposed. The housing HAU may cover the side surface and the bottom surface of the display panel DP, and the upper surface may be completely exposed, however, the present disclosure should not be limited thereto or thereby. According to an embodiment, the housing HAU may cover a portion of the upper surface in addition to the side surface and the bottom surface of the display panel DP.

[0063] Figure 3 It is along Figure 2 Schematic cross-sectional view of the display panel DP taken along line II'.

[0064] In an embodiment, the display panel DP may be a light-emitting display panel. For example, the display panel DP may be a quantum dot light-emitting display panel including quantum dot light-emitting elements, however, the present disclosure should not be limited thereto or thereby. According to an embodiment, the display panel DP may be an organic light-emitting display panel including organic electroluminescent elements.

[0065] The display panel DP may include a base substrate BS, a circuit element layer DP-CL disposed on the base substrate BS, and a display element layer DP-EL disposed on the circuit element layer DP-CL.

[0066] The base substrate BS may be disposed at the lowest position of the display panel DP, and may provide a base surface on which components of the display panel DP are disposed.

[0067] The circuit element layer DP-CL may be disposed on the base substrate BS. The circuit element layer DP-CL may include a plurality of insulating layers and circuit elements.

[0068] The display element layer DP-EL may be disposed on the circuit element layer DP-CL. The display element layer DP-EL may include a pixel defining layer PDL (refer to Figure 6 ), display element ED-2 (reference Figure 6 ) and encapsulation layer TFE (reference Figure 6 ).

[0069] Figure 4 is a plan view of a display panel DP according to an embodiment of the present disclosure.

[0070] The display surface IS of the display panel DP may include a display area DA and a non-display area NDA. The display area DA of the display panel DP may include a light emitting area PXA and a peripheral area NPXA.

[0071] The light emitting area PXA may be defined as an area from which light in the display area DA is emitted. The light emitting area PXA may be arranged throughout the display area DA with a certain rule. For example, the light emitting area PXA may be arranged in the first direction DR1 and the second direction DR2.

[0072] The light emitting regions PXA arranged in the same row may be defined as a pixel row. In an embodiment, a pixel row may be provided in plurality. The pixel rows may be arranged spaced apart from each other in the first direction DR1. The pixel row may include light emitting regions PXA spaced apart from each other in the second direction DR2.

[0073] The light emitting region PXA may include a first light emitting region PXA1, a second light emitting region PXA2, and a third light emitting region PXA3. In the light emitting region PXA, the first light emitting region PXA1, the second light emitting region PXA2, and the third light emitting region PXA3 may be arranged in the second direction DR2 in the order of the third light emitting region PXA3, the first light emitting region PXA1, and the second light emitting region PXA2. Accordingly, in the light emitting region PXA, the third light emitting region PXA3 and the second light emitting region PXA2 may be spaced apart from each other while the first light emitting region PXA1 is between the third light emitting region PXA3 and the second light emitting region PXA2. In a plan view, the first light emitting region PXA1 and the second light emitting region PXA2 may be disposed adjacent to each other and may be aligned with the light emitting element ED-1 (reference Figure 5 ) overlap, and the following will refer to Figure 5 Describe this.

[0074] Each of the first to third light emitting regions PXA1 to PXA3 may be arranged in the first direction DR1. In the present disclosure, the expression "light emitting regions are arranged in one direction" may mean that the same type of light emitting regions are continuously arranged in one direction.

[0075] Figure 4The first to third light emitting areas PXA1 to PXA3 shown in FIG. 1 may be arranged in a stripe pattern, however, the arrangement of the first to third light emitting areas PXA1 to PXA3 should not be limited thereto or thereby. For example, depending on the characteristics of the display quality required by the display panel DP, the arrangement of the first to third light emitting areas PXA1 to PXA3 may be provided in various combinations. For example, the first to third light emitting areas PXA1 to PXA3 may be arranged in a PENTILE pattern. TM Pattern or DiamondPixel TM Pattern arrangement.

[0076] The peripheral area NPXA may correspond to a remaining area of ​​the display area DA excluding the light emitting area PXA. The peripheral area NPXA may be disposed adjacent to the light emitting area PXA.

[0077] Figure 5 yes Figure 4 An enlarged plan view of area AA'.

[0078] refer to Figure 5 , display panel DP (reference Figure 4 ) may include a unit element UE, first and second arrangement electrodes AE1 and AE2, and first and second conductive lines AL1 and AL2. The unit element UE may include a first light emitting element ED-1 and a second light emitting element ED-2.

[0079] For ease of explanation, Figure 5 The first lower electrodes EL-11 and EL-12 included in the first light emitting element ED-1 are schematically shown by dotted lines (refer to Figure 6 ) and the second lower electrode EL-2 (reference Figure 6 ). The lower electrodes EL-2, EL-11, and EL-12 indicated by dotted lines may correspond to light emitting elements.

[0080] The first light emitting element ED-1 and the second light emitting element ED-2 may be spaced apart from each other in a plan view. The first light emitting element ED-1 may have a size larger than that of the second light emitting element ED-2 in a plan view.

[0081] In a plan view, the first arrangement electrode AE1 and the second arrangement electrode AE2 may overlap the first light emitting element ED-1. The first arrangement electrode AE1 and the second arrangement electrode AE2 may be disposed to face each other. Figure 5As shown in , in a plan view, the first arrangement electrode AE1 and the second arrangement electrode AE2 may have substantially the same rectangular shape. However, the shapes of the first arrangement electrode AE1 and the second arrangement electrode AE2 should not be limited to the rectangular shape as long as the first arrangement electrode AE1 and the second arrangement electrode AE2 face each other and are spaced apart from each other in a plan view, and the first arrangement electrode AE1 and the second arrangement electrode AE2 may have shapes different from each other.

[0082] An end of the first conductive line AL1 may contact the first arrangement electrode AE1, and the other end of the first conductive line AL1 may be connected to a power source (not shown) of the circuit element layer DP-CL. An end of the second conductive line AL2 may contact the second arrangement electrode AE2, and the other end of the second conductive line AL2 may be connected to a power source (not shown) of the circuit element layer DP-CL.

[0083] The first arrangement electrode AE1 and the second arrangement electrode AE2 may receive voltages through the first wire AL1 and the second wire AL2, respectively. The voltage applied to the first arrangement electrode AE1 through the first wire AL1 may be defined as a first voltage, and the voltage applied to the second arrangement electrode AE2 through the second wire AL2 may be defined as a second voltage. The first voltage may be different from the second voltage.

[0084] Accordingly, an electric field may be formed between the first arrangement electrode AE1 and the second arrangement electrode AE2 to which a voltage is applied. The polar material provided between the first arrangement electrode AE1 and the second arrangement electrode AE2 may be moved by the electric force caused by the electric field formed between the first arrangement electrode AE1 and the second arrangement electrode AE2. Figure 6 and Fig.11D The first light emitting layer EML-1 is formed according to the movement of the first quantum dot QD-1 having polarity (refer to Figure 6 ) process.

[0085] In a plan view, the first light emitting region PXA1 and the second light emitting region PXA2 may overlap the first light emitting element ED-1. The first light emitting region PXA1 and the second light emitting region PXA2 may be regions from which light generated by the first light emitting element ED-1 is emitted. However, the first light emitting region PXA1 may emit light having a first color, and the second light emitting region PXA2 may emit light having a second color different from the first color. For example, the display panel DP (refer to Figure 4 ) One light-emitting element ED-1 can be used to emit two different lights.

[0086] The third light emitting region PXA3 may overlap the second light emitting element ED-2 in a plan view. The third light emitting region PXA3 may be a region from which light generated by the second light emitting element ED-2 and having a third color different from the first color and the second color is emitted.

[0087] In an embodiment, the first color may be green, the second color may be blue, and the third color may be red. In another embodiment, the second color may be green, and the third color may be blue. However, the present disclosure should not be limited to or by this. According to an embodiment, the first color may be red, the second color may be blue, and the third color may be green.

[0088] The peripheral area NPXA may include a first peripheral area NPXA1 and a second peripheral area NPXA2. The first peripheral area NPXA1 may be adjacent to the pixel defining layer PDL (refer to Figure 6 ) or the first arrangement electrode AE1 and the second arrangement electrode AE2. The second peripheral area NPXA2 may be adjacent to the first arrangement insulating portion IL1 (reference Figure 6 ) corresponding to.

[0089] Figure 6 It is along Figure 5 Schematic cross-sectional view taken along line II-II'. Figure 7 yes Figure 6 An enlarged schematic cross-sectional view of region BB'.

[0090] refer to Figure 6 , the display panel DP may include a base substrate BS, a circuit element layer DP-CL and a display element layer DP-EL.

[0091] The base substrate BS may provide a base surface on which the components included in the display panel DP are stacked. The base substrate BS may include a synthetic resin layer. The synthetic resin layer may include a thermosetting resin. For example, the synthetic resin layer may be a polyimide resin layer, however, the present disclosure should not be limited thereto or thereby. The synthetic resin layer may include at least one of an acrylic resin, a methacrylic resin, a polyisoprene resin, a vinyl resin, an epoxy resin, a polyurethane resin, a cellulose resin, a siloxane resin, a polyamide resin, and a perylene resin. The base substrate BS may be a glass substrate, a metal substrate, or an organic / inorganic composite material substrate. The base substrate BS may be a flexible substrate that is easily bent or folded.

[0092] The circuit element layer DP-CL may be disposed on the base substrate BS. The circuit element layer DP-CL may include a plurality of insulating layers and circuit elements. The insulating layer may include at least one inorganic layer and at least one organic layer. The circuit element may include a signal line and a driving circuit, etc. The driving circuit may include a pixel driving circuit and a sensing driving circuit.

[0093] The display element layer DP-EL may be disposed on the circuit element layer DP-CL. The display element layer DP-EL may include a pixel defining layer PDL, light emitting elements ED-1 and ED-2, first and second arrangement electrodes AE1 and AE2, first, second and third arrangement insulating portions IL1, IL2 and IL3, and an encapsulation layer TFE.

[0094] In this specification, the first arrangement insulating portion IL1 may be expressed as a 'lower electrode insulating portion'.

[0095] The first light emitting element ED-1 may include first lower electrodes EL-11 and EL-12, a first hole transport region HTR-1, a first light emitting layer EML-1, a first electron transport region ETR-1, and an upper electrode EL-C.

[0096] The second light emitting element ED-2 may include a second lower electrode EL-2, a second hole transport region HTR-2, a second light emitting layer EML-2, a second electron transport region ETR-2, and an upper electrode EL-C.

[0097] The first lower electrodes EL-11 and EL-12 may be disposed on the circuit element layer DP-CL. The first lower electrodes EL-11 and EL-12 may include a first-first lower electrode EL-11 and a first-second lower electrode EL-12. The first-first lower electrode EL-11 may be spaced apart from the first-second lower electrode EL-12.

[0098] The second lower electrode EL-2 may be disposed on the circuit element layer DP-CL. The second lower electrode EL-2 may have a continuous unit cell different from the first lower electrodes EL-11 and EL-12.

[0099] The first lower electrode and the second lower electrode EL-11, EL-12 and EL-2 may be formed of a metal alloy or a conductive compound. The first lower electrode and the second lower electrode EL-11, EL-12 and EL-2 may be referred to as a pixel electrode. The first lower electrode and the second lower electrode EL-11, EL-12 and EL-2 may be an anode.

[0100] The first lower electrode and the second lower electrode EL-11, EL-12 and EL-2 may be reflective electrodes, however, the present disclosure shall not be limited thereto or thereby. For example, the first lower electrode and the second lower electrode EL-11, EL-12 and EL-2 may be transmissive electrodes or semi-transmissive electrodes. In an embodiment where the first lower electrode and the second lower electrode EL-11, EL-12 and EL-2 are semi-transmissive electrodes or reflective electrodes, each of the first lower electrode and the second lower electrode EL-11, EL-12 and EL-2 may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, Mo, Ti, W, a compound thereof such as LiF or a mixture thereof such as a mixture of Ag and Mg, or a material having a multilayer structure such as LiF / Ca, LiF / Al.

[0101] According to an embodiment, the first and second lower electrodes EL-11, EL-12, and EL-2 may have a multilayer structure of a reflective layer or a semi-transmissive layer formed of the above materials and a transparent conductive layer formed of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO). For example, each of the lower electrodes may have a three-layer structure of ITO / Ag / ITO.

[0102] The first arrangement insulating portion IL1 may be disposed between the first-first lower electrode EL-11 and the first-second lower electrode EL-12 on the circuit element layer DP-CL. The first arrangement insulating portion IL1 may allow the first-first lower electrode EL-11 to be spaced apart from and electrically insulated from the first-second lower electrode EL-12. Figure 6 In the cross-sectional view, the first arrangement insulating portion IL1 has a quadrilateral shape. However, the cross-sectional shape of the first arrangement insulating portion IL1 should not be limited thereto or thereby as long as the first-first lower electrode EL-11 and the first-second lower electrode EL-12 are electrically insulated from each other. The first arrangement insulating portion IL1 may include an insulating material.

[0103] The pixel defining layer PDL may be disposed on the circuit element layer DP-CL. The pixel defining layer PDL may cover at least a portion of the first lower electrodes EL-11 and EL-12 and at least a portion of the second lower electrode EL-2.

[0104] The pixel defining layer PDL may include a silicon-based inorganic material. For example, the pixel defining layer PDL may include at least one of silicon nitride, silicon oxynitride, and silicon oxide. In an embodiment, the pixel defining layer PDL may be referred to as a partition wall.

[0105] The pixel defining layer PDL may be provided with first and second openings OH1 and OH2. At least a portion of the first-first lower electrode EL-11 and at least a portion of the first-second lower electrode EL-12 may be exposed through the first opening OH1, and at least a portion of the second lower electrode EL-2 may be exposed through the second opening OH2.

[0106] In an embodiment, a portion of the first-first lower electrode EL-11 exposed through the first opening OH1 may correspond to the first light emitting region PXA1, a portion of the first-second lower electrode EL-12 exposed through the first opening OH1 may correspond to the second light emitting region PXA2, and a portion of the second lower electrode EL-2 exposed through the second opening OH2 may correspond to the third light emitting region PXA3.

[0107] The first opening OH1 may have a size larger than that of the second opening OH2 in a plan view. For example, in a plan view, the sum of the size of the first light emitting region PXA1 and the size of the second light emitting region PXA2 may be larger than the size of the third light emitting region PXA3.

[0108] The first hole transport region HTR-1 may be disposed on the first lower electrodes EL-11 and EL-12. Although not shown in the drawings, the first hole transport region HTR-1 may include a hole injection layer, a hole transport layer and / or an electron blocking layer as its sub-functional layers.

[0109] The second hole transport region HTR-2 may be disposed on the second lower electrode EL-2. Although not shown in the drawings, the second hole transport region HTR-2 may include a hole injection layer, a hole transport layer, and / or an electron blocking layer as its sub-functional layers.

[0110] The first light emitting layer EML-1 may be disposed in the first opening OH1. The first light emitting layer EML-1 may be disposed on the first lower electrodes EL-11 and EL-12.

[0111] The first light emitting layer EML-1 may include first quantum dots QD-1 and an organic light emitting material OR. The first light emitting layer EML-1 may be formed of a liquid light emitting composition including the first quantum dots QD-1, the organic light emitting material OR, and an organic solvent.

[0112] According to an embodiment, one first light emitting element ED-1 may include two first lower electrodes EL-11 and EL-12, and therefore, two different types of charges may be provided in one first light emitting layer EML-1. For example, the first-first lower electrode EL-11 may provide charges to a portion of the first light emitting layer EML-1 that overlaps with the first light emitting region PXA1 in a plan view, and the first-second lower electrode EL-12 may provide charges to a portion of the first light emitting layer EML-1 that overlaps with the second light emitting region PXA2 in a plan view. Accordingly, the first light emitting layer EML-1 included in the display panel DP may emit two different types of light.

[0113] The second light emitting layer EML-2 may be disposed in the second opening OH2. The second light emitting layer EML-2 may be disposed on the second lower electrode EL-2. The second light emitting layer EML-2 may include a second quantum dot QD-2. The second light emitting layer EML-2 may be formed of a liquid light emitting composition including the second quantum dot QD-2 and an organic solvent. The second light emitting layer EML-2 may emit light having a third color different from the first color and the second color.

[0114] The second arrangement insulating portion IL2 may be disposed between the first arrangement electrode AE1 and the first-first lower electrode EL-11. The second arrangement insulating portion IL2 may prevent the first arrangement electrode AE1 from being electrically connected to the first-first lower electrode EL-11. The first-first lower electrode EL-11 and the first arrangement electrode AE1 may be spaced apart from each other with the second arrangement insulating portion IL2 interposed between the first-first lower electrode EL-11 and the first arrangement electrode AE1. The second arrangement insulating portion IL2 may include an insulating material.

[0115] The third arrangement insulating portion IL3 may be disposed between the second arrangement electrode AE2 and the first-second lower electrode EL-12. The third arrangement insulating portion IL3 may prevent the second arrangement electrode AE2 from being electrically connected to the first-second lower electrode EL-12. The first-second lower electrode EL-12 and the second arrangement electrode AE2 may be spaced apart from each other with the third arrangement insulating portion IL3 interposed between the first-second lower electrode EL-12 and the second arrangement electrode AE2. The third arrangement insulating portion IL3 may include an insulating material.

[0116] The first arrangement electrode AE1 may be disposed on the first-first lower electrode EL-11, and the second arrangement electrode AE2 may be disposed on the first-second lower electrode EL-12. The first arrangement electrode AE1 and the second arrangement electrode AE2 may be disposed to face each other. The first arrangement electrode AE1 and the second arrangement electrode AE2 may be spaced apart from each other.

[0117] like Figure 6As shown in , the first arrangement electrode AE1 and the second arrangement electrode AE2 may have a parallelogram shape in a cross-sectional view, and may have an asymmetric shape. However, the present disclosure should not be limited to or by this, and in a cross-sectional view, the first arrangement electrode AE1 and the second arrangement electrode AE2 may have a symmetric shape or a shape other than a parallelogram shape.

[0118] The first arrangement electrode AE1 and the second arrangement electrode AE2 may be aligned with a side surface PS (refer to FIG. 1 ) of the pixel defining layer PDL defining the first opening OH1. Figure 7 ), however, the present disclosure should not be limited thereto or thereby. According to an embodiment, the first arrangement electrode AE1 and the second arrangement electrode AE2 may be spaced apart from the side surface PS of the pixel defining layer PDL.

[0119] The voltage can be respectively passed through the first wire AL1 (reference Figure 5 ) and the second conductor AL2 (reference Figure 5 ) is applied to the first arrangement electrode AE1 and the second arrangement electrode AE2. In the case where different voltages are applied to the first arrangement electrode AE1 and the second arrangement electrode AE2, an electric field may be formed between the first arrangement electrode AE1 and the second arrangement electrode AE2. Accordingly, the quantum dots disposed between the first arrangement electrode AE1 and the second arrangement electrode AE2 may move in one direction. Figure 6 The state after the first quantum dot QD-1 included in the first light emitting layer EML-1 moves in the second direction DR2 according to the embodiment is schematically illustrated.

[0120] The first electron transport region ETR-1 may be disposed on the first light emitting layer EML-1. The first electron transport region ETR-1 may be disposed between the first light emitting layer EML-1 and the upper electrode EL-C. Although not shown in the figure, the first electron transport region ETR-1 may include an electron injection layer, an electron transport layer, and a hole blocking layer as its sub-functional layers.

[0121] The second electron transport region ETR-2 may be disposed on the second light emitting layer EML-2. The second electron transport region ETR-2 may be disposed between the second light emitting layer EML-2 and the upper electrode EL-C. Although not shown in the figure, the second electron transport region ETR-2 may include an electron injection layer, an electron transport layer, and a hole blocking layer as its sub-functional layers.

[0122] Each of the first hole transport region HTR-1 and the first electron transport region ETR-1 may be patterned by a printing process and may be provided in the first opening OH1 defined by the pixel defining layer PDL. Each of the second hole transport region HTR-2 and the second electron transport region ETR-2 may be patterned by a printing process and may be provided in the second opening OH2 defined by the pixel defining layer PDL.

[0123] The upper electrode EL-C may be completely arranged to cover the first electron transport region ETR-1 and the second electron transport region ETR-2, the first arrangement electrode AE1 and the second arrangement electrode AE2, and the pixel defining layer PDL. The upper electrode EL-C may be a common electrode. The upper electrode EL-C may be a cathode or an anode. For example, in the case where the lower electrodes EL-11, EL-12, and EL-2 are anodes, the upper electrode EL-C may be a cathode, and in the case where the lower electrodes EL-11, EL-12, and EL-2 are cathodes, the upper electrode EL-C may be an anode.

[0124] The upper electrode EL-C may be a transmissive electrode, a semi-transmissive electrode or a reflective electrode.

[0125] In an embodiment where the upper electrode EL-C is a transmissive electrode, the upper electrode EL-C may include a transparent metal oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), or the like.

[0126] In an embodiment where the upper electrode EL-C is a semi-transmissive electrode or a reflective electrode, the upper electrode EL-C may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF / Ca, LiF / Al, Mo, Ti, Yb, W, a compound thereof such as LiF, or a mixture thereof such as AgMg, AgYb, or MgAg, or a material having a multilayer structure such as LiF / Ca, LiF / Al. According to an embodiment, the upper electrode EL-C may have a multilayer structure of a reflective layer or a semi-transmissive layer formed of the above materials and a transparent conductive layer formed of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO). For example, the upper electrode EL-C may include the above metal materials, a combination of two or more metal materials selected from the above metal materials, or an oxide of the above metal materials.

[0127] Although not shown in the drawings, a capping layer may be provided on the upper electrode EL-C.

[0128] The encapsulation layer TFE may be disposed on the circuit element layer DP-CL and cover the display element layer DP-EL. The encapsulation layer TFE may include an organic layer or an inorganic layer. The encapsulation layer TFE may prevent the display device DD (refer to FIG. 1 ) from being damaged by moisture, oxygen, or foreign matter that penetrates the display device DD. Figure 1 ) reliability degradation.

[0129] refer to Figure 7 , the first light emitting layer EML-1 may include a first portion PT1, a second portion PT2, and a third portion PT3.

[0130] The first portion PT1 may include a first quantum dot QD-1 and an organic light-emitting material OR, and may be adjacent to the first arrangement electrode AE1. The second portion PT2 may include an organic light-emitting material OR, and may be adjacent to the second arrangement electrode AE2. In a plan view, the third portion PT3 may be disposed between the first portion PT1 and the second portion PT2, and may overlap the first arrangement insulating portion IL1. However, for ease of explanation, the first portion PT1, the second portion PT2, and the third portion PT3 are distinguished from each other, and the first light-emitting layer EML-1 may have a continuous monomer.

[0131] The first portion PT1 may emit light having a first color, and the second portion PT2 may emit light having a second color different from the first color. For example, one first light emitting layer EML-1 may emit two different lights. In an embodiment, the first color may be green and the second color may be blue, however, the present disclosure should not be limited thereto or thereby. In another embodiment, the first color may be red and the second color may be blue.

[0132] In an embodiment, the first quantum dot QD-1 may have polarity, and the organic light emitting material OR may not have polarity.

[0133] In the case where the first quantum dot QD-1 has polarity, the first quantum dot QD-1 can be moved by forming an electric field in the first light-emitting layer EML-1. For example, a voltage can be applied to the first arrangement electrode AE1 and the second arrangement electrode AE2 to move the first quantum dot QD-1 closer to the first arrangement electrode AE1. For example, in the case where the first quantum dot QD-1 has a positive charge, the voltage applied to the first arrangement electrode AE1 can be lower than the voltage applied to the second arrangement electrode AE2, and in the case where the first quantum dot QD-1 has a negative charge, the voltage applied to the second arrangement electrode AE2 can be lower than the voltage applied to the first arrangement electrode AE1. Accordingly, the first quantum dot QD-1 can be moved closer to the first arrangement electrode AE1 by electric force.

[0134] Unlike the above, since the organic light emitting material OR does not have polarity, even if a voltage is applied to the first arrangement electrode AE1 and the second arrangement electrode AE2, power does not act on the organic light emitting material OR. For example, even if a voltage is applied to the first arrangement electrode AE1 and the second arrangement electrode AE2, the distribution of the organic light emitting material OR in the first light emitting layer EML-1 may not be significantly changed. In the present disclosure, the expression "the distribution of the organic light emitting material is not significantly changed" may mean that the position of the organic light emitting material OR is not changed by the power generated by the electric field formed between the first arrangement electrode AE1 and the second arrangement electrode AE2.

[0135] The first quantum dot QD-1 may have a first energy level, and the organic light emitting material OR may have a second energy level higher than the first energy level. In the present disclosure, the term "energy level of quantum dots or light emitting materials" may mean the level of energy required for quantum dots or light emitting materials to emit light.

[0136] In addition to the first quantum dot QD-1, the first portion PT1 of the first light-emitting layer EML-1 may include an organic light-emitting material OR. Accordingly, when the energy level of the organic light-emitting material OR is lower than the energy level of the first quantum dot QD-1, when a voltage for the organic light-emitting material OR to emit light is applied, both the first quantum dot QD-1 and the organic light-emitting material OR may emit light in the first portion PT1.

[0137] However, since the organic light emitting material OR has a higher energy level than that of the first quantum dot QD-1, only the first quantum dot QD-1 can emit light in the first portion PT1. According to the embodiment, since two materials having different energy levels are provided, only one material can selectively emit light in the first portion PT1 of the first light emitting layer EML-1. Therefore, color mixing can be prevented in the first portion PT1.

[0138] According to an embodiment, the first quantum dot QD-1 can provide light having a first color in the first portion PT1 of the first light emitting layer EML-1, and the organic light emitting material OR can provide light having a second color in the second portion PT2 of the first light emitting layer EML-1. For example, only one first light emitting layer EML-1 disposed in one first opening OH1 can provide light having two colors. Accordingly, the light emitting elements ED-1 and ED-2 in the display panel DP (refer to Figure 6 ) and can improve the resolution of the display device DD.

[0139] However, since one light emitting layer (e.g., the first light emitting layer EML-1) emits two colors of light, when the thicknesses H1 and H2 of the lower electrode are the same as each other and the thicknesses ET1 and ET2 of the first light emitting layer are the same as each other, at least one of the two colors of light may not resonate. For example, the light emitting efficiency of the first light emitting layer EML-1 may be reduced.

[0140] However, according to the embodiment, since the thicknesses H1 and H2 of the lower electrode and the thicknesses ET1 and ET2 of the first and second portions of the first light emitting layer are adjusted, both the first color light and the second color light generated by the first light emitting layer EML-1 can resonate.

[0141] For example, in the case where the distance from the upper surface EGT of the first-first lower electrode to the lower surface ECB of the upper electrode is referred to as the first resonance thickness TH1, the first resonance thickness TH1 may be the resonance thickness of light having the first color. In the case where the distance from the upper surface EBT of the first-second lower electrode to the lower surface ECB of the upper electrode is referred to as the second resonance thickness TH2, the second resonance thickness TH2 may be the resonance thickness of light having the second color.

[0142] refer to Figure 7 In the case where the thickness H1 of the first-first lower electrode is less than the thickness H2 of the first-second lower electrode and the thickness ET1 of the first portion is greater than the thickness ET2 of the second portion, the first thickness TH1 may be greater than the second thickness TH2, however, the present disclosure is not limited thereto. According to an embodiment, in the case where the thicknesses H1 and H2 of the lower electrodes and the thicknesses ET1 of the first portion and ET2 of the second portion are changed, the first resonance thickness TH1 may be less than or equal to the second resonance thickness TH2.

[0143] The thickness H3 of the first arrangement insulating portion and the thickness H2 of the first-second lower electrode may be the same, however, the present disclosure should not be limited thereto or thereby. For example, the thickness H3 of the first arrangement insulating portion and the thickness H1 of the first-first lower electrode may be the same. According to an embodiment, the thickness H3 of the first arrangement insulating portion may be greater than the thickness H1 of the first-first lower electrode, and may be less than the thickness H2 of the first-second lower electrode.

[0144] Figure 8 is a schematic cross-sectional view of a portion of a display device according to an embodiment of the present disclosure.

[0145] refer to Figure 8 The display device may include a display panel DP-1 and a light control layer PP disposed on the display panel DP-1. Figure 8 In the same / similar reference numerals, Figures 4 to 7, and thus, detailed description of the same / similar elements will be omitted and the following description will focus on different features.

[0146] The display panel DP-1 may be a light-emitting display panel. For example, the display panel DP-1 may be a quantum dot light-emitting display panel including quantum dot light-emitting elements, however, the present disclosure should not be limited thereto or thereby. According to an embodiment, the display panel DP-1 may be an organic light-emitting display panel including organic electroluminescent elements.

[0147] The light control layer PP may be disposed on the display element layer DP-EL. The light control layer PP may include a base layer BL and a color filter layer CFL.

[0148] The base layer BL may provide a base surface on which the color filter layer CFL is disposed. The base layer BL may be a glass substrate, a metal substrate, or a plastic substrate, however, the present disclosure should not be limited thereto or thereby. According to an embodiment, the base layer BL may be an inorganic layer, an organic layer, or a composite material layer.

[0149] The color filter layer CFL may include a light shielding portion BM, a third filter CF-3 transmitting light having a first color, a first filter CF-1 transmitting light having a second color, and a second filter CF-2 transmitting light having a third color. For example, the third filter CF-3 may be a red filter, the first filter CF-1 may be a green filter, and the second filter CF-2 may be a blue filter.

[0150] Each of the filters CF-1, CF-2, and CF-3 may include a polymer photosensitive resin and a pigment or dye. In an embodiment, the first filter CF-1 may include a green pigment or dye, the second filter CF-2 may include a blue pigment or dye, and the third filter CF-3 may include a red pigment or dye, however, the present disclosure should not be limited thereto or thereby. According to an embodiment, the first filter CF-1 may include a red pigment or dye, the second filter CF-2 may include a blue pigment or dye, and the third filter CF-3 may include a green pigment or dye.

[0151] The light shielding portion BM may be a black matrix. The light shielding portion may include an organic light shielding material or an inorganic light shielding material containing a black pigment or dye. The light shielding portion BM may prevent light leakage from occurring and may define boundaries between the filters CF-1, CF-2, and CF-3 adjacent to each other.

[0152] Although not in Figure 8, but the color filter layer CFL may further include a buffer layer. The buffer layer may serve as a protective layer for protecting the filters CF-1, CF-2, and CF-3. The buffer layer may be an inorganic material layer including at least one inorganic material among silicon nitride, silicon oxide, and silicon oxynitride. The buffer layer may have a single-layer structure or a multi-layer structure.

[0153] Figure 8 A structure in which the second filter CF-2 of the color filter layer CFL overlaps the first filter CF-1 and the third filter CF-3 in a plan view is schematically shown, however, the present disclosure should not be limited to or restricted thereto. For example, in a plan view, the first filter CF-1, the second filter CF-2, and the third filter CF-3 may be distinguished from each other by the light shielding portion BM, and may not overlap each other. According to an embodiment, the first filter CF-1, the second filter CF-2, and the third filter CF-3 may be arranged to correspond to the first light emitting area PXA1, the second light emitting area PXA2, and the third light emitting area PXA3, respectively.

[0154] and Figure 8 Unlike the structure shown in FIG. 1 , the display device may include a polarizer (not shown) instead of the color filter layer CFL as the light control layer PP. The polarizer (not shown) may block external light provided to the display panel DP from outside the display panel DP. The polarizer (not shown) may block a portion of the external light. The polarizer (not shown) may reduce reflected light generated in the display panel DP by the external light.

[0155] Fig. 9 is a schematic diagram showing the structure of a quantum dot QD according to an embodiment of the present disclosure.

[0156] refer to Fig. 9 , a quantum dot QD may include a core CR, at least one shell SL surrounding the core CR, and a ligand LG disposed outside the shell SL.

[0157] The quantum dots QD may include Group II-VI compounds, Group III-V compounds, Group III-VI compounds, Group I-III-VI compounds, Group IV-VI compounds, Group IV elements, Group IV compounds, or combinations thereof.

[0158] The II-VI Group compounds may be selected from: binary compounds selected from the group consisting of CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and mixtures thereof, binary compounds selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, Ternary compounds selected from the group consisting of CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof, and quaternary compounds selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof.

[0159] Group III-VI compounds may include, for example, In 2 S 3 and / or In 2 Se 3 Binary compounds such as InGaS 3 and / or InGaSe 3 ternary compound or a combination thereof.

[0160] The group I-III-VI compound may be selected from: AgInS, AgInS 2 、CuInS、CuInS 2 、AgGaS 2 、CuGaS 2 、CuGaO 2 、AgGaO 2 、AgAlO 2 and mixtures thereof or selected from the group consisting of AgInGaS 2 and CuInGaS 2 A quaternary compound consisting of a group.

[0161] The III-V group compound can be selected from: a binary compound selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and a mixture thereof, a ternary compound selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb and a mixture thereof, and a quaternary compound selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and a mixture thereof. The III-V group compound can further include a Group II metal. For example, InZnP can be selected as the III-II-V group compound.

[0162] The IV-VI group compound can be selected from: a binary compound selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof, a ternary compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof, and a quaternary compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof. The IV group element can be selected from the group consisting of Si, Ge and mixtures thereof. The IV group compound can be a binary compound selected from the group consisting of SiC, SiGe and mixtures thereof.

[0163] The binary compound, ternary compound, or quaternary compound may be present in a particle at a uniform concentration, or may be present in the same particle after being divided into a plurality of parts having different concentrations.

[0164] The interface between the core CR and the shell SL may have a concentration gradient in which the concentration of an element present in the shell SL decreases as the distance from the center decreases.

[0165] The quantum dot QD may have a core-shell structure including a core CR containing the above-mentioned nanocrystals and a shell SL surrounding the core CR. The shell SL of the quantum dot QD may act as a protective layer for preventing chemical modification of the core CR and maintaining semiconductor properties and / or may act as a charging layer for imparting electrophoretic properties to the quantum dot QD. The shell SL may have a single-layer or multi-layer structure. The shell SL of the quantum dot QD may include a metal oxide, a non-metal oxide, a semiconductor compound, or a combination thereof.

[0166] The metal oxide or non-metal oxide may include SiO 2 、Al 2 O 3 、TiO 2 、ZnO、MnO、Mn 2 O 3 , Mn 3 O 4 , CuO, FeO, Fe 2 O 3 , Fe 3 O 4 , CoO, Co 3 O 4 and NiO or binary compounds such as MgAl 2 O 4 、CoFe 2 O 4 、NiFe 2 O 4 and CoMn 2 O 4 However, the present disclosure should not be limited to or thereby.

[0167] The semiconductor compound may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP or AlSb, however, the present disclosure should not be limited to or thereby.

[0168] The quantum dot QD may have a full width at half maximum (FWHM) of a light emitting wavelength spectrum less than or equal to about 45 nm. For example, the quantum dot QD may have a full width at half maximum (FWHM) of a light emitting wavelength spectrum less than or equal to about 40 nm. For example, the quantum dot QD may have a full width at half maximum (FWHM) of a light emitting wavelength spectrum less than or equal to about 30 nm or less. Color purity and color reproducibility may be improved within this range. Since the light emitted by the quantum dot QD may be emitted in all directions, the optical viewing angle may be improved.

[0169] The quantum dot QD may have a shape commonly used in the art, however, the present disclosure should not be particularly limited. For example, the quantum dot QD may have a spherical, pyramidal, multi-arm or cubic nanoparticle, nanotube, nanowire, nanofiber or nanosheet shape.

[0170] Quantum dots can control the color of emitted light depending on the particle size, and accordingly, the quantum dots can have various emission colors such as blue, red, and green. As the size of the quantum dot QD decreases, the quantum dot QD can emit light in a shorter wavelength region. For example, in a quantum dot QD having the same core CR, the particle size of a quantum dot emitting green light may be smaller than the particle size of a quantum dot emitting red light. In a quantum dot QD having the same core CR, the particle size of a quantum dot QD emitting blue light may be smaller than the particle size of a quantum dot QD emitting green light, however, the present disclosure should not be limited to or thereby. According to an embodiment, in a quantum dot QD having the same core CR, the particle size of the quantum dot can be adjusted according to the material of the shell SL and the thickness of the shell SL.

[0171] In the case where the quantum dots QD have various light emitting colors such as blue, red, and green, the core CRs of the quantum dots QD having different light emitting colors may include materials different from each other.

[0172] The ligand LG may be placed on the surface of the shell SL of the quantum dot QD. The ligand LG may increase the dispersibility of the quantum dot QD, however, the present disclosure is not limited thereto. According to an embodiment, the quantum dot QD may have a structure in which the ligand LG is not placed on the surface of the quantum dot QD.

[0173] In an embodiment, the quantum dot QD may have polarity. For example, the shell SL or ligand LG of the quantum dot QD may have a positive charge or a negative charge. Accordingly, the quantum dot QD may receive electric power in an electric field, and thus, the quantum dot QD may be moved by the electric power.

[0174] Fig.10 is a flowchart illustrating a method of manufacturing a display device according to an embodiment of the present disclosure. FIG. 11A to FIG. 11F 2 is a schematic cross-sectional view illustrating a process of a method of manufacturing a display device according to an embodiment of the present disclosure.

[0175] In the following, reference will be made to Fig.10 and FIG. 11A to FIG. 11F A method of manufacturing a display device is described. The following description will focus on the method of manufacturing a display device without repeating the description of the structural characteristics of the display device.

[0176] refer to Fig.10, the method for manufacturing a display device may include forming a lower electrode (step S100), forming a partition wall (step S200), forming an arrangement electrode (step S300), providing a light-emitting composition (step S400), and forming an electric field (step S500).

[0177] refer to Fig.11A , formation of the lower electrode (step S100) (reference Fig.10 ) may include: providing a base substrate BS; forming a first-first lower electrode EL-11 on the base substrate BS, a first-second lower electrode EL-12 on the base substrate BS and spaced apart from the first-first lower electrode EL-11, and a first arrangement insulating portion IL1 between the first-first lower electrode EL-11 and the first-second lower electrode EL-12; and forming a second lower electrode EL-2 spaced apart from the first lower electrodes EL-11 and EL-12.

[0178] The formation of the first-first lower electrode EL-11 and the first-second lower electrode EL-12 may be performed substantially simultaneously, however, the present disclosure should not be limited thereto or thereby. For example, the formation of the other of the lower electrodes EL-11 and EL-12 may be performed before the formation of one of the lower electrodes EL-11 and EL-12.

[0179] The formation of the first lower electrodes EL-11 and EL-12 and the formation of the second lower electrode EL-2 may be performed substantially simultaneously, however, the present disclosure should not be limited thereto or thereby.

[0180] The first lower electrodes EL-11 and EL-12 and the second lower electrode EL-2 may be formed by a sputtering process, however, the present disclosure should not be limited thereto or thereby. For example, the first lower electrodes EL-11 and EL-12 and the second lower electrode EL-2 may be formed by a physical vapor deposition (PVD) process.

[0181] The formation of the partition wall (step S200) may be performed (refer to Fig.10 ). Formation of partition walls (step S200) (refer to Fig.10 ) may include: forming a pixel defining layer PDL on a base substrate BS; and forming openings OH1 and OH2 on the pixel defining layer PDL to expose at least a portion of the first-first lower electrode EL-11, at least a portion of the first-second lower electrode EL-12, and at least a portion of the second lower electrode EL-2. The openings OH1 and OH2 may be formed by etching a portion of the pixel defining layer PDL using a photolithography process.

[0182] refer to Fig. 11B , the formation of the arrangement electrode (step S300) may be performed (refer to Fig.10), to form a first arrangement electrode AE1 and a second arrangement electrode AE2 spaced apart from the first arrangement electrode AE1 in the first opening OH1. The first arrangement electrode AE1 and the second arrangement electrode AE2 may be formed of a metal alloy or a conductive compound.

[0183] The first arrangement electrode AE1 and the second arrangement electrode AE2 may be formed by a sputtering process, however, the present disclosure shall not be limited thereto or thereby.For example, the first arrangement electrode AE1 and the second arrangement electrode AE2 may be formed by a physical vapor deposition (PVD) process.

[0184] refer to Fig. 11C , the provision of the luminescent composition (step S400) may be performed (refer to Fig.10 ) to provide a first quantum dot QD-1 (reference Figure 7 ) and organic light-emitting materials OR (reference Figure 7 ) of the first luminescent composition INK1. The luminescent composition may be a liquid luminescent composition.

[0185] The provision of the luminescent composition (step S400) may include providing the first luminescent composition INK1 to the first opening OH1 by an inkjet printing method and providing the second luminescent composition INK2 to the second opening OH2 by an inkjet printing method. For example, the first nozzle NZ1 may provide the first luminescent composition INK1 in a liquid state to the first opening OH1 by discharging the first luminescent composition INK1. The second nozzle NZ2 may provide the second luminescent composition INK2 in a liquid state to the second opening OH2 by discharging the second luminescent composition INK2.

[0186] However, the present disclosure should not be limited to or constrained thereto. For example, the first light-emitting composition INK1 and the second light-emitting composition INK2 may be provided to the first opening OH1 and the second opening OH2, respectively, by various methods such as vacuum deposition, spin coating, casting, LB (Langmuir-Blodgett) method, laser printing, LITI (laser induced thermal imaging) method, etc.

[0187] The process of providing the first light-emitting composition INK1 to the first opening OH1 and the process of providing the second light-emitting composition INK2 to the second opening OH2 may be performed substantially simultaneously, however, the present disclosure should not be limited thereto or thereby. According to an embodiment, one of the process of providing the first light-emitting composition INK1 to the first opening OH1 and the process of providing the second light-emitting composition INK2 to the second opening OH2 may be completed first, and then, the other of the process of providing the first light-emitting composition INK1 to the first opening OH1 and the process of providing the second light-emitting composition INK2 to the second opening OH2 may be performed.

[0188] refer to Fig.11D and Fig.11E , the first arrangement electrode AE1 can be connected to the power supply of the circuit element layer DP-CL through the first wire AL1, and can receive a first voltage. The second arrangement electrode AE2 can be connected to the power supply of the circuit element layer DP-CL through the second wire AL2, and can receive a second voltage different from the first voltage. Accordingly, an electric field can be formed between the first arrangement electrode AE1 and the second arrangement electrode AE2.

[0189] The forming of the electric field (step S500 ) may be performed to move the first quantum dot QD- 1 in a direction closer to the first arrangement electrode AE1 by forming the electric field between the first arrangement electrode AE1 and the second arrangement electrode AE2 . Fig.11D and Fig.11E States before and after the movement of the first quantum dot QD-1 due to the formation of the electric field are schematically shown, respectively.

[0190] Since the first quantum dot QD-1 may have polarity, the first quantum dot QD-1 may be moved in the direction to the first arrangement electrode AE1 by the electric force caused by the electric field. The first voltage and the second voltage may be adjusted to move the first quantum dot QD-1 in the direction to the first arrangement electrode AE1. For example, in the case where the first quantum dot QD-1 has a positive charge, the first voltage may be less than the second voltage, and in the case where the first quantum dot QD-1 has a negative charge, the first voltage may be greater than the second voltage.

[0191] The first quantum dot QD-1 may move in the direction to the first arrangement electrode AE1 by the electric force caused by the electric field. Since the first light-emitting composition INK1 is not completely dried, the first light-emitting composition INK1 may have fluidity. Accordingly, the first quantum dot QD-1 may move in the first portion PT1 (reference Figure 7 ) direction. For example, the first quantum dot QD-1 can be concentrated in the first portion PT1 (refer to Figure 7 )middle.

[0192] According to the display device DD (reference Figure 1 ), the first quantum dot QD-1 and the organic light-emitting material OR may be accommodated in one first opening OH1. Accordingly, in the method of manufacturing the display device DD, a plurality of openings for accommodating the first quantum dot QD-1 and the organic light-emitting material OR, respectively, may not be required. Therefore, the time and cost required to form additional openings on the pixel defining layer PDL may be reduced.

[0193] The volume of the first light emitting composition INK1 filled in the first opening OH1 may be greater than the volume of the second light emitting composition INK2 filled in the second opening OH2. Accordingly, even if the liquid light emitting composition is not formed in an extremely small volume, a display device having a high resolution may be manufactured.

[0194] refer to Fig.11F , a process of forming a first electron transport region ETR-1 and a second electron transport region ETR-2 on the first light emitting layer EML-1 and the second light emitting layer EML-2, respectively, and a process of forming an upper electrode EL-C on the first electron transport region ETR-1 and the second electron transport region ETR-2 can be performed.

[0195] According to an embodiment, the process of forming the first electron transport region ETR-1 and the second electron transport region ETR-2 may include a process of providing an electron transport material on the first light emitting layer EML-1 and the second light emitting layer EML-2, a vacuum drying process, and a heat treatment process. The vacuum drying process may include evaporating an organic solvent (not shown) included in the electron transport material.

[0196] The upper electrode EL-C may be a common electrode. The upper electrode EL-C may be a transmissive electrode, a semi-transmissive electrode or a reflective electrode. In the case where the upper electrode EL-C is a transmissive electrode, the upper electrode EL-C may include a transparent metal oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), etc.

[0197] A process of forming an encapsulation layer TFE on the display element layer DP-EL may be performed. The encapsulation layer TFE may include an organic layer and an inorganic layer. The organic layer of the encapsulation layer TFE may be formed by a solution process such as spin coating, slit coating or inkjet process. The inorganic layer of the encapsulation layer TFE may be formed by a deposition process. For example, the inorganic layer of the encapsulation layer TFE may be formed by a chemical vapor deposition (CVD) process using an open mask.

[0198] In the case where the organic material reflows to the edge of the display device, a portion of the reflowed organic material may be removed through an ashing process.

[0199] Although not shown in the figure, the method of manufacturing a display device may further include drying the liquid light-emitting composition to dry the first light-emitting composition INK1. The drying of the liquid light-emitting composition and the formation of the electric field (step S500) may be performed by the same process (refer to Fig.10 For example, the electric field can be formed (step S500) (refer to Fig.10) The drying process of the liquid luminescent composition is performed at least partially overlapping in time, however, the present disclosure should not be limited thereto or thereby. According to an embodiment, the drying of the liquid luminescent composition and the formation of the electric field (step S500) may be performed first in time (refer to Fig.10 )one of the.

[0200] The drying of the liquid luminescent composition and the formation of the electric field (step S500) are performed by the same process (refer to Fig.10 ), the time and cost required to manufacture the display device DD can be reduced.

[0201] The above description is an example of the technical features of the present disclosure, and those skilled in the art to which the present disclosure belongs will be able to make various modifications and changes.Therefore, the embodiments of the present disclosure described above can be implemented separately or in combination with each other.

[0202] Therefore, the embodiments disclosed in the present disclosure are not intended to limit the technical spirit of the present disclosure, but are intended to describe the technical spirit of the present disclosure, and the scope of the technical spirit of the present disclosure is not limited by these embodiments. The protection scope of the present disclosure should be interpreted by the claims, and it should be understood that all technical spirits within the equivalent scope are included in the scope of the present disclosure.

Claims

1. A display device, comprising: base substrate; a partition wall disposed on the base substrate and provided with a first opening; a first arrangement electrode disposed in the first opening; a second arrangement electrode disposed in the first opening and spaced apart from the first arrangement electrode; as well as A first light emitting layer is disposed in the first opening and includes: A first portion, comprising a first quantum dot and an organic light emitting material and disposed adjacent to the first arrangement electrode; as well as The second portion includes the organic light emitting material and is disposed adjacent to the second arrangement electrode.

2. The display device according to claim 1, wherein: The first quantum dot has polarity, and The organic light-emitting material has no polarity.

3. The display device according to claim 1, wherein: The first portion emits light having a first color, and The second portion emits light having a second color different from the first color.

4. The display device according to claim 1, wherein: In the case where the first quantum dot has a positive charge, the first arrangement electrode receives a voltage lower than a voltage applied to the second arrangement electrode, and In the case where the first quantum dot has a negative charge, the second arrangement electrode receives a voltage lower than a voltage applied to the first arrangement electrode.

5. The display device according to claim 3, further comprising: a first lower electrode disposed on the base substrate and at least partially exposed through the first opening of the partition wall; first-second lower electrodes disposed on the base substrate and at least partially exposed through the first opening of the partition wall; as well as The lower electrode insulating portion is disposed between the first-first lower electrode and the first-second lower electrode and on the base substrate to insulate the first-first lower electrode from the first-second lower electrode.

6. The display device according to claim 5, further comprising: a first arrangement insulating portion, disposed between the first-first lower electrode and the first arrangement electrode; as well as A second arrangement insulating portion is provided between the first-second lower electrodes and the second arrangement electrode.

7. The display device according to claim 5, further comprising: The upper electrode is arranged on the first light emitting layer and the partition wall.

8. The display device according to claim 7, further comprising: A hole transport region, disposed between the first-first lower electrode and the first light-emitting layer and between the first-second lower electrode and the first light-emitting layer; as well as The electron transport region is arranged between the first light emitting layer and the upper electrode.

9. A method for manufacturing a display device, comprising: forming a base substrate, a first-first lower electrode on the base substrate, a first-second lower electrode on the base substrate and spaced apart from the first-first lower electrode, and a lower electrode insulating portion between the first-first lower electrode and the first-second lower electrode; forming a partition wall, and forming an opening through the partition wall to expose at least a portion of each of the first-first lower electrode and the first-second lower electrode; forming a first arrangement electrode and a second arrangement electrode spaced apart from the first arrangement electrode in the opening; providing a liquid light-emitting composition comprising quantum dots and an organic light-emitting material to the opening; as well as An electric field is formed between the first arrangement electrode and the second arrangement electrode to move the quantum dots in a direction closer to the first arrangement electrode.

10. The method according to claim 9, further comprising: drying the liquid luminescent composition, Wherein, the drying of the liquid luminescent composition and the forming of the electric field are performed by the same process.

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