Electroluminescent display device

Abstract

An electroluminescent display device is provided, the electroluminescent display device comprising: a substrate comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel, a first electrode in each of the first to third sub-pixels on the substrate, a light-emitting cell on the first electrode, and a second electrode on the light-emitting cell, wherein the light-emitting cell comprises a first stack comprising a first light-emitting layer, a second stack comprising a second light-emitting layer, and a charge generation layer disposed between the first stack and the second stack, wherein the charge generation layer comprises a first charge generation layer disposed in the first sub-pixel and a second charge generation layer disposed in the second sub-pixel and the third sub-pixel, and wherein the second charge generation layer does not overlap with the first sub-pixel and spans the second charge generation layer in the second sub-pixel and the third sub-pixel, and wherein the second charge generation layer.

Description

Technical Field

[0001] This disclosure relates to an apparatus, and more particularly to, for example, but not limited to, an electroluminescent display apparatus. Background Technology

[0002] An electroluminescent display device includes a first electrode, a second electrode, and a light-emitting layer disposed between the first electrode and the second electrode, and displays an image by emitting light through the electric field between the first electrode and the second electrode.

[0003] Electroluminescent display devices may include multiple stacks disposed above and below a charge generation layer. In this case, leakage current may occur between adjacent sub-pixels through the charge generation layer, therefore methods have been designed to disconnect the charge generation layer between adjacent sub-pixels.

[0004] However, in this case, the following problem exists: due to the difference in the amount of residual charge between the stack below the charge generation layer and the stack above the charge generation layer, leakage current is generated in the vertical direction, resulting in screen defects such as flashing. Summary of the Invention

[0005] This disclosure is made in view of the above problems, and one aspect of this disclosure is to provide an electroluminescent display device that can prevent or reduce leakage current in the vertical direction by increasing the potential of the charge generation layer by reducing the horizontal resistance between sub-pixels, thereby eliminating screen defects such as flash.

[0006] According to one aspect of this disclosure, the above and other technical effects can be achieved by providing an electroluminescent display device, the electroluminescent display device comprising: a substrate, the substrate including a first sub-pixel, a second sub-pixel, and a third sub-pixel; a first electrode in each of the first to third sub-pixels on the substrate; a light-emitting unit on the first electrode; and a second electrode on the light-emitting unit, wherein the light-emitting unit includes a first stack including a first light-emitting layer, a second stack including a second light-emitting layer, and a charge-generating layer disposed between the first stack and the second stack, wherein the charge-generating layer includes a first charge-generating layer disposed in the first sub-pixel and a second charge-generating layer disposed in the second sub-pixel and the third sub-pixel, and wherein the second charge-generating layer does not overlap with the first sub-pixel, and the second charge-generating layer is continuous across the second sub-pixel and the third sub-pixel.

[0007] Furthermore, according to one aspect of this disclosure, the above and other technical effects can be achieved by providing an electroluminescent display device, the electroluminescent display device comprising: a plurality of pixels including a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the plurality of pixels being arranged in a first direction and a second direction; and a light-emitting unit disposed in the plurality of pixels, the light-emitting unit including a charge-generating layer, wherein the charge-generating layer includes a first charge-generating layer and a second charge-generating layer, the first charge-generating layer being disposed in the first sub-pixel, the second charge-generating layer not overlapping with the first sub-pixel, and the second charge-generating layer being continuous across the second sub-pixel and the third sub-pixel, and wherein the second charge-generating layer being continuous across two or more pixels arranged along the first direction.

[0008] Other systems, methods, features, and advantages will be or will become apparent to those skilled in the art upon examination of the following figures and detailed description. All such additional systems, methods, features, and advantages are intended to be included in this specification, within the scope of this disclosure, and protected by the appended claims. Nothing in this section should be construed as limiting these claims. Further aspects and advantages are discussed below in conjunction with embodiments of this disclosure.

[0009] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory, and are intended to provide further explanation of the claimed inventive concept. Attached Figure Description

[0010] The accompanying drawings illustrate embodiments of the present disclosure and, together with the description, explain the principles of the disclosure. The drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application. In the drawings:

[0011] Figure 1 This is a schematic cross-sectional view of an electroluminescent display device according to an embodiment of the present disclosure.

[0012] Figure 2 This is a schematic cross-sectional view of a light-emitting unit according to an embodiment of the present disclosure.

[0013] Figure 3 This is a schematic cross-sectional view of a light-emitting unit according to another embodiment of the present disclosure.

[0014] Figures 4 to 8 This is a schematic plan view of an electroluminescent display device according to various embodiments of the present disclosure.

[0015] Figure 9 This is a schematic cross-sectional view of a light-emitting unit according to another embodiment of the present disclosure.

[0016] Figure 10 This is a schematic cross-sectional view of a light-emitting unit according to another embodiment of the present disclosure.

[0017] Figure 11 This is a schematic cross-sectional view of a light-emitting unit according to another embodiment of the present disclosure.

[0018] Figures 12 to 16 This is a schematic plan view of an electroluminescent display device according to various embodiments of the present disclosure.

[0019] Throughout the accompanying drawings and detailed description, unless otherwise stated, the same reference numerals shall be understood to refer to the same elements, features, and structures. Detailed Implementation

[0020] Reference will now be made in detail to embodiments of this disclosure, examples of which are illustrated in the accompanying drawings. The described progression of processing steps and / or operations is exemplary; however, the order of steps and / or operations is not limited to that set forth herein, except that they must occur in a specific order, and can be varied as is known in the art. The names of the elements used in the following description may be chosen solely for ease of writing and may therefore differ from those used in actual products.

[0021] The advantages and features of this disclosure, and its implementation, will be illustrated by the following embodiments described with reference to the accompanying drawings. However, this disclosure may be implemented in various forms and should not be construed as limited to the examples set forth herein. Rather, these examples are provided so that this specification will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Furthermore, the scope of this disclosure is defined only by the appended claims.

[0022] The shapes, sizes, dimensions (e.g., length, width, height, thickness, radius, diameter, area, etc.), ratios, angles, number of elements, etc. shown in the accompanying drawings used to describe embodiments of the present disclosure are merely exemplary, and the present disclosure is not limited thereto.

[0023] Any implementation described as an "example" in this article is not necessarily to be interpreted as superior to or better than other implementations.

[0024] For ease of description, dimensions including the size and thickness of each component shown in the accompanying drawings are shown, and this disclosure is not limited to the size and thickness of the components shown, but it should be noted that the relative dimensions including the relative sizes, positions and thicknesses of the components shown in the various drawings submitted herein are part of this disclosure.

[0025] Throughout this specification, the same reference numerals denote the same elements. In the following description, detailed descriptions will be omitted where it is determined that such detailed descriptions of relevant known functions or configurations unnecessarily obscure the essential points of this disclosure. Where the terms “comprising,” “having,” and “including” are used as described in this disclosure, additional terms may be added unless “only” is used. Unless otherwise stated, singular terms may include plural forms.

[0026] When interpreting components, even without a separate explicit description of the error range, it should be interpreted as including the error range.

[0027] When describing positional relationships, for example, if the positional relationship is described as "above," "over," "below," and "beside," one or more parts may be located between two other parts, unless "only" or "directly" is used. Terms such as "below," "lower," "upper," and "down" may be used herein to describe relationships between elements as shown in the accompanying drawings. It should be understood that these terms are spatially relative and based on the orientation depicted in the accompanying drawings.

[0028] The description of time relationships can include cases where time priority is described as "after", "following", or "before", and is not sequential unless "immediately" or "directly" is used.

[0029] Although terms like "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below can be a second component within the technical concept of this disclosure.

[0030] It should be understood that although the terms “first,” “second,” “A,” “B,” “(a),” and “(b)” are used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0031] If a component is described as “connected,” “joined,” or “attached” to another component, then that component may be directly connected, joined, or attached to that other component. However, it should be understood that other components may be inserted between each component that may be indirectly connected, joined, or attached without any specific description.

[0032] It should be understood that if a component or layer is described as "in contact" or "overlapping" with another component or layer, then that component or layer may be in direct contact or overlap with the other component or layer. However, in the absence of explicit statement, other components may be inserted between components that may be in indirect contact or overlap.

[0033] For further elaboration, as used herein, the term "connection" is intended to have the broadest possible meaning. Specifically, the phrase "A connected to B" encompasses both direct connections (where no intermediate parts or elements exist) and indirect connections (where one or more intermediate parts or elements exist between A and B). In other words, "A connected to B" includes both direct physical or electrical coupling and indirect coupling via one or more intermediate parts. Unless otherwise explicitly stated, these terms do not require direct physical or electrical contact. The terms "coupling" and "contact" should be interpreted in the same manner.

[0034] The terms “first element,” “second element,” and / or “third element” should be understood as one of the first, second, and third elements, or any or all combinations of the first, second, and third elements. For example, A, B, and / or C can refer to A only; B only; C only; any or some combinations of A, B, and C; or all of A, B, and C.

[0035] The term “at least one” should be understood to include any and all combinations of one or more of the associated listed items. For example, “at least one of the first element, the second element, or the third element” means all combinations of all three listed elements, combinations of any two of the three elements, and each individual element, the first element, the second element, or the third element.

[0036] The terms “first direction,” “second direction,” “third direction,” “X-axis direction,” “Y-axis direction,” and “Z-axis direction” should not be interpreted merely as mutually perpendicular geometric relationships, but can indicate that the configuration of this disclosure has a wider range of directions within the scope to which the configuration of this disclosure can function.

[0037] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the example embodiments pertain. It should also be understood that terms (such as those defined in common dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and should not be interpreted in an idealized or overly formal sense unless explicitly defined herein. For example, the terms “part” or “unit” can be applied to, for example, a single circuit or structure, an integrated circuit, a computational block of a circuit arrangement, or any structure configured to perform the functions described herein that would be understood by one of ordinary skill in the art.

[0038] Instead, these embodiments may be provided to make this disclosure thorough and complete enough to assist those skilled in the art in fully understanding its scope. Furthermore, this disclosure is limited only by the scope of the claims.

[0039] Features of each of the various examples disclosed herein may be partially or completely coupled or combined with each other, and various interoperability and driving are technically possible, and each example may be implemented independently of each other or together in a related relationship.

[0040] In the following, one embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0041] Figure 1 This is a schematic cross-sectional view of an electroluminescent display device according to an embodiment of the present disclosure.

[0042] like Figure 1 As shown, the electroluminescent display device according to an embodiment of the present disclosure includes a substrate 100, a circuit element layer 200, a passivation layer 310, a planarization layer 320, a first electrode 400, a dam 450, a light-emitting unit 500, a second electrode 600, and a cover layer 700.

[0043] The substrate 100 may be made of glass, plastic, or semiconductor material, but is not limited thereto. The electroluminescent display device according to the embodiments of the present disclosure may be made of a top-emitting type, and therefore, not only transparent materials but also opaque materials may be used as the material of the first substrate 100.

[0044] The circuit element layer 200 is disposed on the substrate 100.

[0045] The circuit element layer 200 includes driving thin-film transistors configured for each of the red, green, and blue sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels).

[0046] The driving thin-film transistor includes an active layer 210 disposed on a substrate 100, a gate insulating layer 220 disposed on the active layer 210, a gate electrode 230 disposed on the gate insulating layer 220, an interlayer insulating layer 240 disposed on the gate electrode 230, and a source electrode 250 and a drain electrode 260 disposed on the interlayer insulating layer 240.

[0047] The source electrode 250 and the drain electrode 260 are connected to one side and the other side of the active layer 210 through holes provided in the interlayer insulating layer 240 and the gate insulating layer 220.

[0048] Although the figures illustrate a driving thin-film transistor with a top gate structure, wherein the gate electrode 230 is disposed on the active layer 210, this disclosure may include a driving thin-film transistor with a bottom gate structure, wherein the gate electrode 230 is disposed below the active layer 210. Furthermore, although the gate insulating layer 220 is disposed over the entire surface of the substrate 100, the gate insulating layer 220 may be patterned below the gate electrode 230 in the same manner as the gate electrode 230. The driving thin-film transistor may be varied in various forms known in the art.

[0049] Additionally, although not shown, the circuit element layer 200 may also include various signal lines including gating lines, data lines, power lines and reference lines, various thin-film transistors including switching thin-film transistors and sensing thin-film transistors, and capacitors.

[0050] The thin-film transistor is switched according to the gating signal provided to the gating line so that the data voltage provided from the data line is supplied to the driving thin-film transistor.

[0051] The driving thin-film transistor is switched according to the data voltage provided from the switching thin-film transistor to generate a data current from the power supply provided by the power line and to provide the data current to the first electrode 400.

[0052] The sensing thin-film transistor can sense the threshold voltage deviation of the driving thin-film transistor that causes image quality degradation, and supply current to the reference line in response to a sensing control signal provided from the gate line or a separate sensing line.

[0053] The capacitor can maintain the data voltage supplied to the driving thin-film transistor for one frame and is connected to the gate terminal and source terminal of the driving thin-film transistor, respectively.

[0054] A passivation layer 310 is disposed on the circuit element layer 200. Specifically, the passivation layer 310 is disposed on the source electrode 250 and the drain electrode 260. The passivation layer 310 may be formed of an inorganic insulating material, but is not limited thereto.

[0055] A planarization layer 320 is disposed on the passivation layer 310. The planarization layer 320 may be made of an organic insulating material.

[0056] The passivation layer 310 and the planarization layer 320 may include contact holes, through which the source electrode 250 may be exposed, and the first electrode 400 may be connected to the source electrode 250 exposed through the contact holes. In some cases, the drain electrode 260 may be exposed through contact holes provided in the passivation layer 310 and the planarization layer 320, and the first electrode 400 may be connected to the drain electrode 260 exposed through the contact holes.

[0057] The first electrode 400 is disposed in each sub-pixel (R sub-pixel, G sub-pixel, B sub-pixel) on the planarization layer 320.

[0058] The first electrode 400 is connected to the source electrode 250 or the drain electrode 260 through contact holes provided in the passivation layer 310 and the planarization layer 320.

[0059] An electroluminescent display device according to an embodiment of the present disclosure may be formed by a top-emitting type, and accordingly, the first electrode 400 may include a reflective electrode.

[0060] The embankment 450 is set on the planarization layer 320 and is located at the boundary between sub-pixels (R sub-pixels, G sub-pixels, B sub-pixels).

[0061] A dam 450 is disposed on the first electrode 400 to cover the edge of the first electrode 400. The light-emitting area may be defined by the dam 450. Specifically, the portion of the first electrode 400 exposed from being covered by the dam 450 may be the light-emitting area.

[0062] The light-emitting unit 500 is disposed in the light-emitting area defined by the embankment 450. The light-emitting unit 500 is disposed on the first electrode 400, particularly on the portion of the first electrode 400 exposed outside the embankment 450. Furthermore, the light-emitting unit 500 may be disposed on the upper surface of the embankment 450. That is, the light-emitting unit 500 may also be disposed at the boundaries between sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels).

[0063] The light-emitting unit 500 can be formed in various patterns, which will be described later.

[0064] The second electrode 600 is disposed on the light-emitting unit 500.

[0065] The second electrode 600 is formed as a continuous sub-pixel (R sub-pixel, G sub-pixel, B sub-pixel).

[0066] The electroluminescent display device according to the embodiments of the present disclosure can be configured as a top-emitting type, so the second electrode 600 may include a transparent electrode or a semi-transparent electrode.

[0067] A capping layer 700 is disposed on the second electrode 600. The capping layer 700 may include an organic insulating material and may cover particles that may remain on the upper surface of the second electrode 600.

[0068] Although not shown, an encapsulation layer may be additionally disposed on the cover layer 700.

[0069] Figure 2 This is a schematic cross-sectional view of a light-emitting unit according to an embodiment of the present disclosure.

[0070] like Figure 2 As shown, the light-emitting unit 500 according to an embodiment of the present disclosure includes a first stack, a second stack, and a charge generation layer CGL.

[0071] The first stack includes a hole injection layer HIL, a first hole transport layer HTL1, a first light emission layer R-EML1, G-EML1 and B-EML1, and a first electron transport layer ETL1.

[0072] Hole injection layer HIL can be set at the first electrode 400 described above and Figure 1 On the embankment 450, it can be formed as a continuous sequence across red, green and blue sub-pixels (R sub-pixels, G sub-pixels and B sub-pixels).

[0073] In this disclosure, when a material layer is formed to be continuous across multiple subpixels, this means that the material layer is continuous in the multiple subpixels and in the boundary regions between the subpixels.

[0074] The first hole transport layer HTL1 is disposed on the hole injection layer HIL and can be formed as a continuous layer across red, green and blue sub-pixels (R sub-pixels, G sub-pixels and B sub-pixels).

[0075] The first light-emitting layers R-EML1, G-EML1 and B-EML1 are disposed on the first hole transport layer HTL1.

[0076] The first light-emitting layers R-EML1, G-EML1 and B-EML1 include a first red light-emitting layer R-EML1 disposed in the red sub-pixel, a first green light-emitting layer G-EML1 disposed in the green sub-pixel and a first blue light-emitting layer B-EML1 disposed in the blue sub-pixel.

[0077] The first red emitting layer R-EML1, the first green emitting layer G-EML1, and the first blue emitting layer B-EML1 may not overlap each other, but are not limited thereto. Furthermore, the first red emitting layer R-EML1, the first green emitting layer G-EML1, and the first blue emitting layer B-EML1 may be formed without contacting each other.

[0078] The first electron transport layer ETL1 is disposed on the first light-emitting layers R-EML1, G-EML1 and B-EML1, and can be formed as a continuous layer across red, green and blue sub-pixels (R sub-pixels, G sub-pixels and B sub-pixels).

[0079] Although not shown, the first stack may also include a hole blocking layer HBL disposed between the first light-emitting layers R-EML1, G-EML1 and B-EML1 and the first electron transport layer ETL1.

[0080] The second stack includes a second hole transport layer HTL2, third hole transport layers HTL3-1, HTL3-2 and HTL3-3, second light-emitting layers R-EML2, G-EML2, B-EML2, second electron transport layer ETL2 and electron injection layer EIL.

[0081] A second hole transport layer HTL2 is disposed on the charge generation layer CGL. More specifically, the second hole transport layer HTL2 is disposed on the P-type charge generation layers P-CGL1 and P-CGL2. Furthermore, the second hole transport layer HTL2 can be formed continuously across the red, green, and blue sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels). The second hole transport layer HTL2 can be formed from the same material as the first hole transport layer HTL1, but is not limited thereto.

[0082] The third hole transport layers HTL3-1, HTL3-2, and HTL3-3 are set on the second hole transport layer HTL2.

[0083] The third hole transport layers HTL3-1, HTL3-2, and HTL3-3 include the 3-1 hole transport layer HTL3-1 located in the red sub-pixel (R sub-pixel), the 3-2 hole transport layer HTL3-2 located in the green sub-pixel (G sub-pixel), and the 3-3 hole transport layer HTL3-3 located in the blue sub-pixel (B sub-pixel).

[0084] Third hole transport layers HTL3-1, HTL3-2, and HTL3-3 are formed to obtain microcavity effects for each sub-pixel (R sub-pixel, G sub-pixel, and B sub-pixel). Hole transport layer HTL3-1 is used to obtain microcavity effects in the red sub-pixel (R sub-pixel), hole transport layer HTL3-2 is used to obtain microcavity effects in the green sub-pixel (G sub-pixel), and hole transport layer HTL3-3 is used to obtain microcavity effects in the blue sub-pixel (B sub-pixel).

[0085] Considering that red has a longer wavelength than green and green has a longer wavelength than blue, the thickness of the 3-1 hole transport layer HTL3-1 can be greater than the thickness of the 3-2 hole transport layer HTL3-2, and the thickness of the 3-2 hole transport layer HTL3-2 can be greater than the thickness of the 3-3 hole transport layer HTL3-3. In the blue sub-pixel (B sub-pixel), a microcavity effect can be obtained through the second hole transport layer HTL2, and in this case, the 3-3 hole transport layer HTL3-3 can be omitted.

[0086] The third hole transport layers HTL3-1, HTL3-2, and HTL3-3 may be formed of the same material as the second hole transport layer HTL2 or the first hole transport layer HTL1, but are not limited thereto. The third-first hole transport layer HTL3-1, the third-second hole transport layer HTL3-2, and the third-third hole transport layer HTL3-3 may be formed of the same material, but are not limited thereto.

[0087] Hole transport layers HTL3-1 (3-1), HTL3-2 (3-2), and HTL3-3 (3-3) may not overlap. Furthermore, these three hole transport layers may be formed without contacting each other.

[0088] In some cases, the third hole transport layers HTL3-1, HTL3-2, and HTL3-3 may not be formed in the second stack, but may be formed in the first stack. Specifically, the third hole transport layers HTL3-1, HTL3-2, and HTL3-3 may not be formed between the second hole transport layer HTL2 and the second light-emitting layers R-EML2, G-EML2, and B-EML2, but may be formed between the first hole transport layer HTL1 and the first light-emitting layers R-EML1, G-EML1, and B-EML1.

[0089] The second light-emitting layers R-EML2, G-EML2 and B-EML2 are disposed on the third hole transport layers HTL3-1, HTL3-2 and HTL3-3.

[0090] The second light-emitting layers R-EML2, G-EML2 and B-EML2 include a second red light-emitting layer R-EML2 disposed in the red sub-pixel (R sub-pixel), a second green light-emitting layer G-EML2 disposed in the green sub-pixel (G sub-pixel) and a second blue light-emitting layer B-EML2 disposed in the blue sub-pixel (B sub-pixel).

[0091] The second red emitting layer R-EML2, the second green emitting layer G-EML2, and the second blue emitting layer B-EML2 may not overlap, but are not limited thereto. The second red emitting layer R-EML2, the second green emitting layer G-EML2, and the second blue emitting layer B-EML2 may be formed without contacting each other.

[0092] The second red emitting layer R-EML2 can be formed of the same material as the first red emitting layer R-EML1, but is not limited thereto. The second green emitting layer G-EML2 can be formed of the same material as the first green emitting layer G-EML1, but is not limited thereto. The second blue emitting layer B-EML2 can be formed of the same material as the first blue emitting layer B-EML1, but is not limited thereto.

[0093] The second electron transport layer ETL2 is disposed on the second light-emitting layers R-EML2, G-EML2 and B-EML2, and can be formed continuously across red, green and blue sub-pixels (R sub-pixels, G sub-pixels and B sub-pixels).

[0094] Although not shown, the second stack may also include a hole blocking layer HBL disposed between the second light-emitting layers R-EML2, G-EML2 and B-EML2 and the second electron transport layer ETL2.

[0095] The electron injection layer EIL is disposed on the second electron transport layer ETL2 and can be formed as a continuous layer across red, green and blue subpixels (R subpixels, G subpixels and B subpixels).

[0096] According to embodiments of this disclosure, the first light-emitting layers R-EML1, G-EML1, and B-EML1 include a first red light-emitting layer R-EML1, a first green light-emitting layer G-EML1, and a first blue light-emitting layer B-EML1, and the second light-emitting layers R-EML2, G-EML2, and B-EML2 include a second red light-emitting layer R-EML2, a second green light-emitting layer G-EML2, and a second blue light-emitting layer B-EML2. Therefore, without a separate color filter, red light can be emitted from the red sub-pixel (R sub-pixel), green light can be emitted from the green sub-pixel (G sub-pixel), and blue light can be emitted from the blue sub-pixel (B sub-pixel).

[0097] However, this disclosure is not necessarily limited thereto. For example, according to another embodiment of this disclosure, one of the first light-emitting layer between the first hole transport layer HTL1 and the first electron transport layer ETL1, and the second light-emitting layer between the third hole transport layers HTL3-1, HTL3-2, and HTL3-3 and the second electron transport layer ETL2, includes a blue light-emitting layer that is continuous across red, green, and blue sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels), and the remaining light-emitting layers include a yellow-green light-emitting layer that is continuous across red, green, and blue sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels). In this case, a red color filter is additionally provided in the red sub-pixels (R sub-pixels), a green color filter is additionally provided in the green sub-pixels (G sub-pixels), and a blue color filter is additionally provided in the blue sub-pixels (B sub-pixels).

[0098] The charge generation layer CGL is disposed between the first stack and the second stack. The charge generation layer CGL can be disposed between the first electron transport layer ETL1 and the second hole transport layer HTL2.

[0099] The charge generation layer CGL includes an N-type charge generation layer N-CGL and P-type charge generation layers P-CGL1 and P-CGL2.

[0100] The N-type charge generation layer N-CGL provides electrons to the first stack, and the P-type charge generation layers P-CGL1 and P-CGL2 provide holes to the second stack.

[0101] The N-type charge generation layer N-CGL is disposed on the first electron transport layer ETL1 and can be formed as a continuous structure across red, green and blue sub-pixels (R sub-pixels, G sub-pixels, B sub-pixels).

[0102] P-type charge generation layers P-CGL1 and P-CGL2 are disposed on the N-type charge generation layer N-CGL. The P-type charge generation layers P-CGL1 and P-CGL2 include a first P-type charge generation layer P-CGL1 and a second P-type charge generation layer P-CGL2.

[0103] The first P-type charge generation layer P-CGL1 is disposed in the red sub-pixel (R sub-pixel), and the second P-type charge generation layer P-CGL2 is disposed in the green sub-pixel and the blue sub-pixel (G sub-pixel and B sub-pixel).

[0104] The first P-type charge generation layer P-CGL1 can be patterned into an island structure in the red sub-pixel (R sub-pixel), and the second P-type charge generation layer P-CGL2 can be formed as a continuous structure across the green sub-pixel (G sub-pixel) and the blue sub-pixel (B sub-pixel).

[0105] The first P-type charge generation layer P-CGL1 and the second P-type charge generation layer P-CGL2 do not overlap or contact each other.

[0106] P-type charge generation layers P-CGL1 and P-CGL2 can be formed by doping organic materials with metal dopants or non-metallic dopants such as inorganic or organic materials, and thus have good conductivity. Therefore, if the P-type charge generation layers P-CGL1 and P-CGL2 are formed continuously across red, green, and blue sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels), charges can move freely between sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels) through the P-type charge generation layers P-CGL1 and P-CGL2, resulting in leakage current in adjacent sub-pixels.

[0107] Therefore, in order to prevent or reduce this leakage current problem, it is desirable to form the P-type charge generation layers P-CGL1 and P-CGL2 as discontinuous, so that there is no continuity between the red, green and blue sub-pixels (R sub-pixels, G sub-pixels and B sub-pixels).

[0108] However, if the P-type charge generation layers P-CGL1 and P-CGL2 are formed as discontinuous layers with no continuity between sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels), the resistance between the sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels) increases in the horizontal direction. Therefore, the charge may move unevenly and may remain in the boundary regions between the sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels). In this case, when an electric field is applied to the sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels), leakage current is introduced into the stack with low resistance due to the potential asymmetry between the first and second stacks. Therefore, when light with a brightness higher than desired is emitted, screen defects such as flashes occur. Such screen defects increase at low grayscale levels.

[0109] Typically, considering that the driving current decreases in the order of blue sub-pixel (B sub-pixel), red sub-pixel (R sub-pixel), and green sub-pixel (G sub-pixel), a large amount of electron charge remaining in the boundary region flows into the green sub-pixel (G sub-pixel), and screen defects such as flash increase in the green sub-pixel (G sub-pixel).

[0110] Therefore, according to embodiments of this disclosure, for example, by connecting the second P-type charge generation layer P-CGL2 of the blue sub-pixel (B sub-pixel) with a relatively maximum driving current and connecting the second P-type charge generation layer P-CGL2 of the green sub-pixel (G sub-pixel) with a relatively minimum driving current, the resistance in the horizontal direction between the blue sub-pixel (B sub-pixel) and the green sub-pixel (G sub-pixel) can be reduced or the residual electronic charge in the boundary region can be prevented, thereby eliminating screen defects such as flash.

[0111] However, this disclosure is not necessarily limited thereto, and the second P-type charge generation layer P-CGL2 may be formed continuously across two sub-pixels of the blue sub-pixel (B sub-pixel), red sub-pixel (R sub-pixel) and green sub-pixel (G sub-pixel), and the first P-type charge generation layer P-CGL1 may be formed in the remaining sub-pixels.

[0112] In order to reduce the horizontal resistance between the blue sub-pixel (B sub-pixel) and the green sub-pixel (G sub-pixel), the conductivity of the second P-type charge generation layer P-CGL2 can be greater than that of the first P-type charge generation layer P-CGL1.

[0113] The first P-type charge generation layer P-CGL1 can be formed by doping a first organic material with a first dopant such as a metal, and the second P-type charge generation layer P-CGL2 can be formed by doping a second organic material with a second dopant such as a metal.

[0114] In this case, the first organic material and the second organic material can be made of the same material, but are not necessarily limited to this. Furthermore, the first dopant and the second dopant can be made of the same material, but are not necessarily limited to this.

[0115] However, since the doping concentration of the second dopant is formed to be higher than that of the first dopant, the conductivity of the second P-type charge generation layer P-CGL2 can be higher than that of the first P-type charge generation layer P-CGL1.

[0116] Alternatively, the doping concentration of the second dopant is the same as that of the first dopant, but by using a second dopant with a higher conductivity than the first dopant, the conductivity of the second P-type charge generation layer P-CGL2 can be greater than that of the first P-type charge generation layer P-CGL1.

[0117] In addition, according to Figure 2 The N-type charge generation layer N-CGL is formed as a continuous structure across red, green and blue sub-pixels (R sub-pixels, G sub-pixels and B sub-pixels), but this disclosure is not limited thereto, and the N-type charge generation layer N-CGL can also be patterned in the same manner as the P-type charge generation layers P-CGL1 and P-CGL2.

[0118] Specifically, the N-type charge generation layer N-CGL can also consist of a first N-type charge generation layer patterned as an island structure in the red sub-pixel (R sub-pixel) and a second N-type charge generation layer continuously formed across the green sub-pixel (G sub-pixel) and the blue sub-pixel (B sub-pixel).

[0119] In this case, the first N-type charge generation layer may have the same pattern as the first P-type charge generation layer P-CGL1, and the second N-type charge generation layer may have the same pattern as the second P-type charge generation layer P-CGL2.

[0120] The conductivity of the second N-type charge generation layer can be greater than that of the first N-type charge generation layer. For example, the doping concentration in the second N-type charge generation layer can be higher than that in the first N-type charge generation layer, or the dopant in the second N-type charge generation layer can have a higher conductivity than that of the dopant in the first N-type charge generation layer.

[0121] In some cases, the P-type charge generation layer can be formed continuously across red, green, and blue sub-pixels (R sub-pixels, G sub-pixels, B sub-pixels), and the N-type charge generation layer N-CGL can be formed from a first N-type charge generation layer and a second N-type charge generation layer. However, since the P-type charge generation layer is more prone to screen defects such as flashes than the N-type charge generation layer, it is preferable to form the P-type charge generation layer as including... Figure 2 The first P-type charge generation layer P-CGL1 and the second P-type charge generation layer P-CGL2 are shown.

[0122] Figure 3 This is a schematic cross-sectional view of a light-emitting unit according to another embodiment of the present disclosure.

[0123] Figure 3 With the above Figure 2 The difference lies in the modification of the second hole transport layer, HTL2. Therefore, the same reference numerals are used to label the same structures, and the different structures are described below. This also applies to the other embodiments described below.

[0124] like Figure 3 As shown, the second hole transport layer HTL2 includes the second-1 hole transport layer HTL2-1 and the second-2 hole transport layer HTL2-2.

[0125] Hole transport layer 2-1 (HTL2-1) is set in the red sub-pixel (R sub-pixel), and hole transport layer 2-2 (HTL2-2) is set in the green and blue sub-pixels (G sub-pixels and B sub-pixels).

[0126] The second-first hole transport layer HTL2-1 can be formed with the same pattern as the first P-type charge generation layer P-CGL1, and the second-second hole transport layer HTL2-2 can be formed with the same pattern as the second P-type charge generation layer P-CGL2.

[0127] Therefore, the second-first hole transport layer HTL2-1 can be patterned into an island structure in the red sub-pixel (R sub-pixel), and the second-second hole transport layer HTL2-2 can be formed as a continuous structure across the green and blue sub-pixels (G sub-pixels and B sub-pixels).

[0128] Hole transport layers HTL2-1 (2-1) and HTL2-2 (2-2) can be formed without overlapping each other. Furthermore, hole transport layers HTL2-1 (2-1) and HTL2-2 (2-2) can be formed without contacting each other.

[0129] Therefore, the charge does not move horizontally between the second hole transport layer HTL2-1 and the second hole transport layer HTL2-2, so that no leakage current is generated between the red sub-pixel (R sub-pixel) and the green sub-pixel (G sub-pixel) and between the red sub-pixel (R sub-pixel) and the blue sub-pixel (B sub-pixel) through the second hole transport layers HTL2-1 and HTL2-2.

[0130] Hole transport layer 2-1 (HTL2-1) and hole transport layer 2-2 (HTL2-2) can be formed from the same material, but are not limited thereto.

[0131] Figures 4 to 8 This is a schematic plan view of an electroluminescent display device according to various embodiments of the present disclosure. For convenience, in Figures 4 to 8 Only the settings according to the above are shown. Figures 2 to 3 The patterns of the first P-type charge generation layer P-CGL1 and the second P-type charge generation layer P-CGL2 in the sub-pixels (R sub-pixels, G sub-pixels and B sub-pixels).

[0132] like Figures 4 to 8 As shown, the electroluminescent display device according to various embodiments of the present disclosure includes a plurality of pixels, the plurality of pixels including red sub-pixels (R sub-pixels), green sub-pixels (G sub-pixels) and blue sub-pixels (B sub-pixels).

[0133] According to this disclosure, each pixel in a plurality of pixels can be formed by a combination of red sub-pixels (R sub-pixels), green sub-pixels (G sub-pixels), and blue sub-pixels (B sub-pixels), but is not necessarily limited thereto, and may also include a fourth sub-pixel.

[0134] like Figures 4 to 8 As shown, the first P-type charge generation layer P-CGL1 can overlap with the entire area of ​​the red sub-pixel (R sub-pixel). In addition, the first P-type charge generation layer P-CGL1 can overlap with a portion of the boundary region between the red sub-pixel (R sub-pixel) and the green sub-pixel (G sub-pixel), as well as a portion of the boundary region between the red sub-pixel (R sub-pixel) and the blue sub-pixel B (B sub-pixel).

[0135] The first P-type charge generation layer P-CGL1 does not overlap with the green sub-pixel (G sub-pixel) and the blue sub-pixel (B sub-pixel). In addition, the first P-type charge generation layer P-CGL1 is spaced apart from the second P-type charge generation layer P-CGL2.

[0136] The second P-type charge generation layer P-CGL2 can overlap with the entire area of ​​the green sub-pixel (G sub-pixel) and the blue sub-pixel (B sub-pixel). Additionally, the second P-type charge generation layer P-CGL2 can overlap with the entire boundary area between the green sub-pixel (G sub-pixel) and the blue sub-pixel (B sub-pixel). Furthermore, the second P-type charge generation layer P-CGL2 can overlap with a portion of the boundary area between the red sub-pixel (R sub-pixel) and the green sub-pixel (G sub-pixel), and a portion of the boundary area between the red sub-pixel (R sub-pixel) and the blue sub-pixel (B sub-pixel).

[0137] The second P-type charge generation layer P-CGL2 does not overlap with the red sub-pixel (R sub-pixel).

[0138] The following text will describe it in detail. Figures 4 to 8 Multiple pixels in each image.

[0139] like Figure 4 As shown, the blue subpixel (B subpixel) can be spaced apart from the green subpixel (G subpixel) and the red subpixel (R subpixel) in a first direction (e.g., horizontal direction). The blue subpixel (B subpixel) can be positioned to one side of the green subpixel (G subpixel) and the red subpixel (R subpixel), for example, to the left, facing each of the green subpixel (G subpixel) and the red subpixel (R subpixel).

[0140] Green subpixels (G subpixels) and red subpixels (R subpixels) can be spaced apart from each other in a second direction (e.g., in the vertical direction).

[0141] The area of ​​a blue sub-pixel (B sub-pixel) can be larger than the area of ​​a green sub-pixel (G sub-pixel) and a red sub-pixel (R sub-pixel), and the area of ​​a green sub-pixel (G sub-pixel) can be larger than the area of ​​a red sub-pixel (R sub-pixel), but is not limited to this.

[0142] Each of the blue subpixel (B subpixel), green subpixel (G subpixel), and red subpixel (R subpixel) can have a rectangular structure, such as a rectangular structure with curved edges.

[0143] A pixel that includes a combination of blue sub-pixels (B sub-pixels), green sub-pixels (G sub-pixels), and red sub-pixels (R sub-pixels) can be arranged repeatedly in the first and second directions.

[0144] The second P-type charge generation layer P-CGL2 is horizontally continuous across two or more blue sub-pixels (B sub-pixels) and green sub-pixels (G sub-pixels).

[0145] The second P-type charge generation layer P-CGL2 can be discontinuous across two or more pixels in the vertical direction, but is not limited thereto, and can also be continuous across two or more pixels in the vertical direction.

[0146] The second P-type charge generation layer, P-CGL2, can be continuous across all pixels in both the horizontal and vertical directions.

[0147] The first P-type charge generation layer P-CGL1 is patterned into an island structure in the red sub-pixels (R sub-pixels). The first P-type charge generation layer P-CGL1 can have an island structure in the red sub-pixels (R sub-pixels) of all pixels.

[0148] like Figure 5 As shown, the blue sub-pixel (B sub-pixel), green sub-pixel (G sub-pixel), and red sub-pixel (R sub-pixel) can be arranged sequentially in the first direction (e.g., the horizontal direction).

[0149] The area of ​​a blue sub-pixel (B sub-pixel) can be larger than the area of ​​a green sub-pixel (G sub-pixel) and a red sub-pixel (R sub-pixel), and the area of ​​a green sub-pixel (G sub-pixel) can be larger than the area of ​​a red sub-pixel (R sub-pixel), but is not limited to this.

[0150] Each of the blue subpixel (B subpixel), green subpixel (G subpixel), and red subpixel (R subpixel) can have a rectangular structure, such as a rectangular structure with curved edges.

[0151] A pixel that includes a combination of blue sub-pixels (B sub-pixels), green sub-pixels (G sub-pixels), and red sub-pixels (R sub-pixels) can be arranged repeatedly in the first and second directions.

[0152] The second P-type charge generation layer P-CGL2 is continuous across the entire blue sub-pixel (B pixel) and green sub-pixel (G pixel) in the vertical direction, spanning two or more pixels. However, the second P-type charge generation layer P-CGL2 is discontinuous across multiple pixels in the horizontal direction.

[0153] The first P-type charge generation layer P-CGL1 can be continuous across two or more red sub-pixels (R sub-pixels) in the vertical direction. However, the first P-type charge generation layer P-CGL1 is not continuous across multiple red sub-pixels (R sub-pixels) in the horizontal direction.

[0154] like Figure 6 As shown, green subpixels (G subpixels) and blue subpixels (B subpixels) can be spaced apart from red subpixels (R subpixels) in a first direction (e.g., in the horizontal direction).

[0155] Green subpixels (G subpixels) and red subpixels (R subpixels) can be spaced apart from each other in a second direction (e.g., in the vertical direction).

[0156] Green subpixels (G subpixels), blue subpixels (B subpixels), and red subpixels (R subpixels) can be arranged to form the vertices of a triangle.

[0157] Each of the green sub-pixel (G sub-pixel), blue sub-pixel (B sub-pixel), and red sub-pixel (R sub-pixel) can have a circular structure.

[0158] A pixel that includes a combination of blue sub-pixels (B sub-pixels), green sub-pixels (G sub-pixels), and red sub-pixels (R sub-pixels) can be arranged repeatedly in the first and second directions.

[0159] The second P-type charge generation layer P-CGL2 is continuous across the entire blue sub-pixel (B pixel) and green sub-pixel (G pixel) spanning two or more pixels. However, the second P-type charge generation layer P-CGL2 is discontinuous across multiple pixels in the horizontal direction.

[0160] The first P-type charge generation layer P-CGL1 can be continuous across two or more red sub-pixels (R sub-pixels) in the vertical direction. However, the first P-type charge generation layer P-CGL1 is not continuous across multiple red sub-pixels (R sub-pixels) in the horizontal direction.

[0161] like Figure 7 As shown, green subpixels (G subpixels) and blue subpixels (B subpixels) can be spaced apart from red subpixels (R subpixels) in a diagonal direction, for example, from the upper right to the lower left.

[0162] Green subpixels (G subpixels) and red subpixels (R subpixels) can be spaced apart from each other diagonally, for example, from the top left to the bottom right.

[0163] A combination of a green subpixel (G subpixel) and a red subpixel (R subpixel) is arranged repeatedly in a first direction, such as the horizontal direction, while forming a zigzag pattern.

[0164] Green subpixels (G subpixels), blue subpixels (B subpixels), and red subpixels (R subpixels) can be arranged to form the vertices of a triangle.

[0165] Each of the green sub-pixel (G sub-pixel), blue sub-pixel (B sub-pixel), and red sub-pixel (R sub-pixel) can have a circular structure.

[0166] A pixel that includes a combination of blue sub-pixels (B sub-pixels), green sub-pixels (G sub-pixels), and red sub-pixels (R sub-pixels) can be arranged repeatedly in the first and second directions.

[0167] The second P-type charge generation layer P-CGL2 is continuous across the entire blue sub-pixel (B pixel) and green sub-pixel (G pixel) in the horizontal direction, spanning two or more pixels.

[0168] The second P-type charge generation layer P-CGL2 can be discontinuous across two or more pixels in the vertical direction, but is not limited to this, and can also be continuous rather than discontinuous by extending in the vertical direction through the boundary region between two red sub-pixels (R sub-pixels) in multiple pixels. In this case, the second P-type charge generation layer P-CGL2 can be continuous in all pixels in both the horizontal and vertical directions.

[0169] The first P-type charge generation layer P-CGL1 may have an island-like structure, while the red sub-pixels (R sub-pixels) across multiple pixels are discontinuous. However, this disclosure is not limited to this, and the first P-type charge generation layer P-CGL1 may be continuous in the horizontal direction across two or more red sub-pixels (R sub-pixels).

[0170] like Figure 8 As shown, a pixel can include two green sub-pixels (G sub-pixels). For example, the two green sub-pixels (G sub-pixels) can be spaced apart from the blue sub-pixel (B sub-pixel) diagonally.

[0171] A green subpixel (G subpixel) can be separated from the blue subpixel (B subpixel) to the lower right, and another green subpixel (G subpixel) can be separated from the blue subpixel (B subpixel) to the lower left.

[0172] Additionally, the red subpixel (R subpixel) can be spaced apart from the blue subpixel (B subpixel) in a second direction (e.g., in the vertical direction).

[0173] Each of the blue subpixel (B subpixel), green subpixel (G subpixel), and red subpixel (R subpixel) can have a rectangular structure, such as a rectangular structure with curved edges.

[0174] A pixel with an overall rectangular structure is formed by a combination of two green sub-pixels (G sub-pixels), a blue sub-pixel (B sub-pixels), and a red sub-pixel (R sub-pixels), and such pixels can be repeated in the diagonal direction.

[0175] The second P-type charge generation layer P-CGL2 is continuous across the entire blue sub-pixel (B sub-pixel) and green sub-pixel (G sub-pixel) in multiple pixels.

[0176] The first P-type charge generation layer P-CGL1 can have an island-like structure, while the red sub-pixels (R sub-pixels) across multiple pixels are discontinuous.

[0177] Figure 9 This is a schematic cross-sectional view of a light-emitting unit according to another embodiment of the present disclosure.

[0178] Figure 9 With the above Figure 2 The difference lies in the alteration of the P-type charge generation layers P-CGL1 and P-CGL2.

[0179] like Figure 9 As shown, the first P-type charge generation layer P-CGL1 can be formed as a continuous structure across red, green, and blue sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels).

[0180] The second P-type charge generation layer P-CGL2 can be formed as a continuous structure spanning green and blue sub-pixels (G sub-pixels and B sub-pixels).

[0181] The second P-type charge generation layer P-CGL2 is disposed below the first P-type charge generation layer P-CGL1 and can be in contact with the first P-type charge generation layer P-CGL1.

[0182] According to another embodiment of this disclosure, by connecting the second P-type charge generation layer P-CGL2 of the blue sub-pixel (B sub-pixel) with the relatively largest driving current and the second P-type charge generation layer P-CGL2 of the green sub-pixel (G sub-pixel) with the relatively smallest driving current, screen defects such as flash can be eliminated by preventing or reducing residual electronic charge in the boundary region through reducing the horizontal resistance between the blue sub-pixel (B sub-pixel) and the green sub-pixel (G sub-pixel).

[0183] However, this disclosure is not necessarily limited thereto, and the second P-type charge generation layer P-CGL2 can be continuously formed between the blue sub-pixel (B sub-pixel) and the red sub-pixel (R sub-pixel) or between the red sub-pixel (R sub-pixel) and the green sub-pixel (G sub-pixel).

[0184] In addition, such as Figure 2As shown, the N-type charge generation layer N-CGL may include a first N-type charge generation layer formed continuously across red, green, and blue sub-pixels (R, G, and B sub-pixels), and a second N-type charge generation layer formed continuously across green and blue sub-pixels (G and B sub-pixels). That is, the first N-type charge generation layer may be formed with the same pattern as the first P-type charge generation layer P-CGL1, and the second N-type charge generation layer may be formed with the same pattern as the second P-type charge generation layer P-CGL2.

[0185] In some cases, the P-type charge generation layer can be formed as a continuous layer across red, green, and blue sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels), and the N-type charge generation layer N-CGL can be formed by a first N-type charge generation layer and a second N-type charge generation layer.

[0186] Figure 10 This is a schematic cross-sectional view of a light-emitting unit according to another embodiment of the present disclosure.

[0187] Figure 10 and Figure 9 The difference is that the second P-type charge generation layer P-CGL2 is disposed on the first P-type charge generation layer P-CGL1 and is in contact with the first P-type charge generation layer P-CGL1.

[0188] Figure 11 This is a schematic cross-sectional view of a light-emitting unit according to another embodiment of the present disclosure.

[0189] Figure 11 And changed the above Figure 9 The difference lies in the second hole transport layer, HTL2.

[0190] like Figure 11 As shown, the second hole transport layer HTL2 includes the second-1 hole transport layer HTL2-1 and the second-2 hole transport layer HTL2-2.

[0191] Hole transport layer 2-1 (HTL2-1) is set in the red sub-pixel (R sub-pixel), and hole transport layer 2-2 (HTL2-2nd) is set in the green and blue sub-pixels (G sub-pixels and B sub-pixels).

[0192] Hole transport layer 2-1 (HTL2-1) can be patterned in an island-like structure in the red sub-pixel (R sub-pixel), and hole transport layer 2-2 (HTL2-2) can be formed as a continuous structure across the green and blue sub-pixels (G sub-pixels and B sub-pixels).

[0193] Hole transport layers HTL2-1 (2-1) and HTL2-2 (2-2) can be formed without overlapping each other. Furthermore, hole transport layers HTL2-1 (2-1) and HTL2-2 (2-2) can be formed without contacting each other.

[0194] Therefore, the charge will not move horizontally between the second hole transport layers HTL2-1 and HTL2-2, so that no leakage current will be generated between the red sub-pixel (R sub-pixel) and the green sub-pixel (G sub-pixel) and between the red sub-pixel (R sub-pixel) and the blue sub-pixel (B sub-pixel) through the second hole transport layers HTL2-1 and HTL2-2.

[0195] Hole transport layer 2-1 (HTL2-1) and hole transport layer 2-2 (HTL2-2) can be formed from the same material, but are not limited thereto.

[0196] Figures 12 to 16 This is a schematic plan view of an electroluminescent display device according to various embodiments of the present disclosure. For convenience, in Figures 12 to 16 Only the settings described above are shown. Figures 9 to 11 The patterns of the first P-type charge generation layer P-CGL1 and the second P-type charge generation layer P-CGL2 in the sub-pixels (R sub-pixels, G sub-pixels and B sub-pixels).

[0197] Figure 12 and Figure 4 The difference is that all sub-pixels (R sub-pixels, G sub-pixels, B sub-pixels) across multiple pixels in the first P-type charge generation layer P-CGL1 are continuous in both the horizontal and vertical directions.

[0198] Figure 13 and Figure 5 The difference is that all sub-pixels (R sub-pixels, G sub-pixels, B sub-pixels) across multiple pixels in the first P-type charge generation layer P-CGL1 are continuous in both the horizontal and vertical directions.

[0199] Figure 14 and Figure 6 The difference is that all sub-pixels (R sub-pixels, G sub-pixels, B sub-pixels) across multiple pixels in the first P-type charge generation layer P-CGL1 are continuous in both the horizontal and vertical directions.

[0200] Figure 15 and Figure 7 The difference is that all sub-pixels (R sub-pixels, G sub-pixels, B sub-pixels) across multiple pixels in the first P-type charge generation layer P-CGL1 are continuous in both the horizontal and vertical directions.

[0201] Figure 16 and Figure 8 The difference is that all sub-pixels (R sub-pixels, G sub-pixels, and B sub-pixels) of the first P-type charge generation layer P-CGL1 are continuous across multiple pixels in the diagonal direction.

[0202] It will be apparent to those skilled in the art that the above disclosure is not limited to the described embodiments and drawings, and that various substitutions, modifications, and variations can be made in this disclosure without departing from the technical spirit or scope thereof. Therefore, the scope of this disclosure is defined by the appended claims, and all variations or modifications derived from the meaning, scope, and equivalent concepts of the claims are intended to fall within the scope of this disclosure.

[0203] The various embodiments described above can be combined to provide further embodiments. Based on the detailed description above, these and other changes can be made to the embodiments. Generally, the terminology used in the appended claims should not be construed as limiting the claims to the specific embodiments disclosed in the specification and claims, but should be interpreted to include all possible embodiments and the full scope of equivalents conferred by these claims. Therefore, the claims are not limited to this disclosure.

[0204] Cross-reference to related applications

[0205] This application claims priority to Korean Patent Application No. 10-2024-0179012, filed on December 4, 2024, which is incorporated herein by reference in its entirety.

Claims

1. An electroluminescent display device, the electroluminescent display device comprising: A substrate, the substrate comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel; The first electrode in each of the first to third sub-pixels on the substrate; The light-emitting unit on the first electrode; as well as The second electrode on the light-emitting unit, The light-emitting unit includes a first stack containing a first light-emitting layer, a second stack containing a second light-emitting layer, and a charge-generating layer disposed between the first stack and the second stack. The charge generation layer includes a first charge generation layer disposed in the first sub-pixel and a second charge generation layer disposed in the second sub-pixel and the third sub-pixel. The second charge generation layer does not overlap with the first sub-pixel, and the second charge generation layer is continuous across the second sub-pixel and the third sub-pixel.

2. The electroluminescent display device according to claim 1, wherein, The conductivity of the second charge-generating layer is greater than that of the first charge-generating layer.

3. The electroluminescent display device according to claim 1, wherein, The charge generation layer includes an N-type charge generation layer and a P-type charge generation layer, and the P-type charge generation layer includes a first charge generation layer and a second charge generation layer.

4. The electroluminescent display device according to claim 1, wherein, One of the second sub-pixel and the third sub-pixel is a blue sub-pixel, and the other of the second sub-pixel and the third sub-pixel is a green sub-pixel.

5. The electroluminescent display device according to claim 1, wherein, The first charge generation layer does not overlap with the second sub-pixel and the third sub-pixel.

6. The electroluminescent display device according to claim 1, wherein, The first charge generation layer is spaced apart from the second charge generation layer.

7. The electroluminescent display device according to claim 1, wherein, The first charge generation layer is continuous across the first sub-pixel, the second sub-pixel, and the third sub-pixel.

8. The electroluminescent display device according to claim 7, wherein, The second charge generation layer is disposed above or below the first charge generation layer.

9. The electroluminescent display device according to claim 1, wherein, The second stack includes a hole transport layer disposed on the charge generation layer. The hole transport layer includes a first hole transport layer disposed in the first sub-pixel and a second hole transport layer disposed in the second and third sub-pixels. The second hole transport layer does not overlap with the first sub-pixel, and the second hole transport layer is continuous across the second sub-pixel and the third sub-pixel.

10. The electroluminescent display device according to claim 9, wherein, The first hole transport layer has the same pattern as the first charge generation layer, and the second hole transport layer has the same pattern as the second charge generation layer.

11. An electroluminescent display device, the electroluminescent display device comprising: The plurality of pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the plurality of pixels are arranged in a first direction and a second direction; as well as Light-emitting units disposed in the plurality of pixels, the light-emitting units including charge generation layers. The charge generation layer includes a first charge generation layer and a second charge generation layer. The first charge generation layer is disposed in the first sub-pixel, and the second charge generation layer does not overlap with the first sub-pixel. Furthermore, the second charge generation layer is continuous across the second sub-pixel and the third sub-pixel. Wherein, the second charge generation layer spans two or more pixels arranged along the first direction and is continuous.

12. The electroluminescent display device according to claim 11, wherein, The second charge generation layer is discontinuous across the plurality of pixels arranged along the second direction.

13. The electroluminescent display device according to claim 11, wherein, The second charge generation layer is continuous across all the multiple pixels arranged along the first and second directions.

14. The electroluminescent display device according to claim 11, wherein, The first charge generation layer is disposed in an island-like structure in all the plurality of pixels arranged along the first direction and the second direction.

15. The electroluminescent display device according to claim 11, wherein, The first charge generation layer spans two or more pixels arranged along the first direction and is continuous.

16. The electroluminescent display device according to claim 11, wherein, The first charge generation layer is continuous across all the multiple pixels arranged along the first and second directions.

17. The electroluminescent display device according to claim 11, wherein, The conductivity of the second charge-generating layer is greater than that of the first charge-generating layer.

18. The electroluminescent display device according to claim 11, wherein, The charge generation layer includes an N-type charge generation layer and a P-type charge generation layer, and the P-type charge generation layer includes a first charge generation layer and a second charge generation layer.

19. The electroluminescent display device according to claim 11, wherein, One of the second sub-pixel and the third sub-pixel is a blue sub-pixel, and the other of the second sub-pixel and the third sub-pixel is a green sub-pixel.

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