Display panel with charge generation layer, display device and head-mounted display device, and methods of forming the same

Abstract

A display panel with a charge generation layer, a display device, and a method for forming the same, as well as an HMD, are provided. The display device may include a light-emitting device disposed on a light-emitting region of a device substrate. The light-emitting device may include a first electrode, a light-emitting unit, and a second electrode sequentially stacked on the device substrate. The light-emitting unit may include a first light-emitting stack and a second light-emitting stack disposed on the first light-emitting stack. A charge generation layer may be disposed between the first light-emitting stack and the second light-emitting stack. A planarization layer may be disposed between the device substrate and the first electrode. The planarization layer may include a partition trench extending along a first direction outside the light-emitting region. The charge generation layer may be separated by the partition trench. The side surface of the charge generation layer extending along a second direction perpendicular to the first direction may be covered by either the first light-emitting stack or the second light-emitting stack. Therefore, in the display device, leakage current caused by the charge generation layer can be reduced or prevented.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2025-0010431, filed in Korea on January 23, 2025, the entire contents of which are expressly incorporated herein by reference as if fully set forth herein. Technical Field

[0003] This disclosure relates to apparatus, preferably but not limited to display apparatus, wherein the light-emitting device includes a charge generation layer disposed between light-emitting stacks. Background Technology

[0004] Typically, a display device provides an image to a user. For example, a display device may include a light-emitting device. The light-emitting device can emit light displaying a specific color. For example, the light-emitting device may include light-emitting units disposed between a first electrode and a second electrode. The light-emitting units may include a light-emitting stack. Each of the light-emitting stacks can generate light. For example, a charge-generating layer may be disposed between the light-emitting stacks. Therefore, in a display device, the image provided to the user may include a variety of colors. The content mentioned or associated in the Related Art section should not be construed as prior art simply because it appears in that section. The discussion in the Related Art section may contain information describing one or more aspects of the subject matter of this art, and the description in this section does not constitute a limitation of this disclosure. Summary of the Invention

[0005] Therefore, this disclosure relates to a display device that substantially eliminates one or more problems caused by the limitations and disadvantages of the prior art.

[0006] The purpose of this disclosure is to provide a display device that minimizes the degradation of image quality caused by leakage current.

[0007] Another object of this disclosure is to provide a display device that can reduce or prevent leakage current caused by the charge generation layer.

[0008] Additional advantages, objects, and features of this disclosure will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following, or may be learned by practice of this disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of structures particularly pointed out in this disclosure, the claims, and the accompanying drawings.

[0009] To achieve these and other aspects of the inventive concept, as embodied and broadly described herein, a display device is provided, comprising a device substrate. The device substrate includes a first light-emitting region, a second light-emitting region, and a third light-emitting region. The second light-emitting region is disposed side-by-side with the first light-emitting region along a first direction. The third light-emitting region is disposed side-by-side with the first light-emitting region along a second direction perpendicular to the first direction. A planarization layer is disposed on the device substrate. The planarization layer overlaps with the first, second, and third light-emitting regions. A first light-emitting device, a second light-emitting device, and a third light-emitting device are disposed on the planarization layer. The first light-emitting device overlaps with the first light-emitting region. The first light-emitting device includes a first light-emitting unit disposed between a first electrode and a second electrode. The second light-emitting device overlaps with the second light-emitting region. The second light-emitting device includes a second light-emitting unit disposed between the first and second electrodes. The third light-emitting device overlaps with the third light-emitting region. The third light-emitting device includes a third light-emitting unit disposed between the first and second electrodes. Each of the first and second light-emitting units has a stacked structure of a first light-emitting stack, a first charge-generating layer, and a second light-emitting stack. The planarization layer includes a separating trench disposed between the first and second light-emitting regions. The first charge generation layer is separated by a separating trench. The side surface of the first charge generation layer is covered by a second light-emitting stack between the first light-emitting region and the third light-emitting region.

[0010] The second light-emitting stack can contact the side surface of the first charge-generating layer extending along the first direction.

[0011] The second luminous area can produce a different color than the first luminous area.

[0012] The second light-emitting stack can produce light that displays a different color than the first light-emitting stack.

[0013] The third light-emitting unit may include a second light-emitting stack, a second charge-generating layer, and a third light-emitting stack. The second charge-generating layer may be disposed on the second light-emitting stack. The third light-emitting stack may be disposed on the second charge-generating layer. The side surface of the second charge-generating layer may be covered by the second light-emitting stack between the first light-emitting region and the third light-emitting region.

[0014] The third light-emitting stack can produce light that displays a different color than the first and second light-emitting stacks.

[0015] The second light-emitting stack of the third light-emitting unit can contact the second light-emitting stack of the first light-emitting unit between the first light-emitting region and the third light-emitting region.

[0016] The third luminous area can achieve the same color as the second luminous area.

[0017] In another embodiment, a display device is provided, comprising a device substrate. The device substrate includes a first light-emitting region and a second light-emitting region. The second light-emitting region is disposed side-by-side with the first light-emitting region. A first light-emitting device and a second light-emitting device are disposed on the device substrate. The first light-emitting device overlaps with the first light-emitting region. The first light-emitting device includes a first electrode, a first light-emitting stack, a first charge-generating layer, a second light-emitting stack, and a second electrode. The first light-emitting stack is disposed on the first electrode. The first charge-generating layer is disposed on the first light-emitting stack. The second light-emitting stack is disposed on the first charge-generating layer. The second electrode is disposed on the second light-emitting stack. The second light-emitting device overlaps with the second light-emitting region. The second light-emitting device includes a first electrode, a second light-emitting stack, a second charge-generating layer, a third light-emitting stack, and a second electrode. The second charge-generating layer is disposed between the second light-emitting stack and the second electrode. The third light-emitting stack is disposed between the second charge-generating layer and the second electrode. The second light-emitting stack extends between the first charge-generating layer and the second charge-generating layer.

[0018] The second light-emitting stack may include a portion overlapping the first light-emitting region and a portion overlapping the second light-emitting region. The portion of the second light-emitting stack that overlaps with the second light-emitting region may be positioned closer to the device substrate than the portion of the second light-emitting stack that overlaps with the first light-emitting region.

[0019] A planarization layer can be disposed between the device substrate and the first light-emitting device. The planarization layer can extend between the device substrate and the second light-emitting device. A third light-emitting device can be disposed on the planarization layer of the third light-emitting region. The third light-emitting region can be disposed side-by-side with the second light-emitting region along a first direction. The second light-emitting region can be disposed side-by-side with the first light-emitting region along a second direction perpendicular to the first direction. The third light-emitting device can have a stacked structure of a first electrode, a second light-emitting stack, a second charge-generating layer, a third light-emitting stack, and a second electrode. The planarization layer can include a separating trench disposed between the second light-emitting region and the third light-emitting region. The second charge-generating layer can be separated by the separating trench. The side surface of the second charge-generating layer can be covered by the second light-emitting stack between the first light-emitting region and the second light-emitting region.

[0020] The second luminous region can produce a different color than the first luminous region. The third luminous region can produce a different color than the first and second luminous regions.

[0021] A fourth light-emitting device can be disposed on a planarization layer of a fourth light-emitting region. The fourth light-emitting region can be disposed side-by-side with the first light-emitting region along a second direction. A third light-emitting region can be disposed side-by-side with the fourth light-emitting region along a first direction. The fourth light-emitting device can have a stacked structure comprising a first electrode, a first light-emitting stack, a first charge-generating layer, a second light-emitting stack, and a second electrode. The first charge-generating layer can be separated from the first light-emitting region and the fourth light-emitting region by a separating trench. The side surface of the first charge-generating layer can be covered by the second light-emitting region between the third and fourth light-emitting regions.

[0022] The fourth luminous region can achieve the same color as the second luminous region.

[0023] The second light-emitting stack in the fourth light-emitting region can contact the second light-emitting stack in the third light-emitting region between the third and fourth light-emitting regions.

[0024] In another embodiment, a method for forming a display device is provided, comprising: arranging a device substrate, the device substrate including a first light-emitting region, a second light-emitting region, a third light-emitting region, and a fourth light-emitting region; wherein the third light-emitting region is arranged side-by-side with the second light-emitting region along a first direction, the second light-emitting region is arranged side-by-side with the first light-emitting region along a second direction perpendicular to the first direction, the fourth light-emitting region is arranged side-by-side with the first light-emitting region along the first direction, and the third light-emitting region is arranged side-by-side with the fourth light-emitting region along the second direction; forming a planarization layer on the device substrate, the planarization layer overlapping the first light-emitting region, the second light-emitting region, the third light-emitting region, and the fourth light-emitting region; wherein the planarization layer includes separating trenches respectively disposed between the first light-emitting region and the fourth light-emitting region, and / or between the second light-emitting region and the third light-emitting region; forming a first light-emitting stack and a first charge-generating layer above the first light-emitting region and the fourth light-emitting region; forming a second light-emitting stack above the first light-emitting region, the second light-emitting region, the third light-emitting region, and the fourth light-emitting region; and forming a second charge-generating layer and a third light-emitting stack on the portion of the second light-emitting stack overlapping with the second light-emitting region, and forming a second charge-generating layer and a third light-emitting stack on the portion of the second light-emitting stack overlapping with the third light-emitting region.

[0025] In another embodiment, a display panel is provided, comprising: a device substrate, wherein for each pixel, the device substrate includes a first light-emitting region, a second light-emitting region, a third light-emitting region, and a fourth light-emitting region, these regions being arranged in a 2×2 matrix along a row direction and a column direction perpendicular to the row direction; light-emitting devices in each light-emitting region; and a planarization layer disposed between the light-emitting devices and the device substrate; wherein each light-emitting device in the first row of the 2×2 matrix includes: a first electrode, a first light-emitting stack disposed on the first electrode, a first charge-generating layer disposed on the first light-emitting stack, a second light-emitting stack disposed on the first charge-generating layer, and a second electrode disposed on the second light-emitting stack; wherein each light-emitting device in the second row of the 2×2 matrix includes: a first electrode, a second light-emitting stack disposed on the first electrode, a second charge-generating layer disposed on the second light-emitting stack, a third light-emitting stack disposed on the second charge-generating layer, and a second electrode disposed on the third light-emitting stack; wherein the first charge-generating layer of each light-emitting device is separated by a separating trench at least partially formed in the planarization layer and located between corresponding light-emitting regions; and the second light-emitting stack extends between the first charge-generating layer and the second charge-generating layer.

[0026] In another embodiment, a head-mounted display device is provided, including an image element comprising a display device according to any of the above embodiments, and the image element being fixed in front of a user's eyes. Attached Figure Description

[0027] The accompanying drawings illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. The drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application. In the drawings:

[0028] Figure 1 This is a schematic view illustrating a display device according to an exemplary embodiment of the present disclosure;

[0029] Figure 2 yes Figure 1 Enlarged view of region K in the image;

[0030] Figure 3 This is a view showing the circuitry of a sub-pixel in a display device according to an exemplary embodiment of the present disclosure;

[0031] Figure 4 It is along Figure 2 An example of a view captured by I-I';

[0032] Figure 5 yes Figure 4 Enlarged view of region R1 in the image;

[0033] Figure 6It is along Figure 2 An example of a view captured by II-II';

[0034] Figure 7 yes Figure 6 Enlarged view of region R2 in the image;

[0035] Figures 8 to 13 This is a view illustrating a method of forming a display device according to an exemplary embodiment of the present disclosure; and

[0036] Figures 14 to 17 This is a view showing a display device according to another example embodiment of the present disclosure. Detailed Implementation

[0037] In the following detailed description with reference to the accompanying drawings, which illustrate some embodiments of the present disclosure, the details related to the above-described objectives, technical configurations, and operational effects of the embodiments thereof will become clear. Embodiments of the present disclosure are provided herein so that the technical spirit of the disclosure can be satisfactorily conveyed to those skilled in the art, and therefore the disclosure can be implemented in other forms and is not limited to the embodiments described below. In the following description, detailed descriptions of known functions or structures relevant to this document will be omitted if such detailed descriptions might unnecessarily obscure the essential points of the inventive concept. The order of the described processing steps and / or operations is merely illustrative; however, unless the steps and / or operations must be performed in a specific order, the order of the steps and / or operations is not limited to that described, but may be varied as is known in the art.

[0038] Furthermore, throughout the specification, identical or very similar elements may be represented by the same reference numerals, and in the drawings, for convenience, the length and thickness of layers and regions may be exaggerated. It will be understood that when the first element is referred to as "on" the second element, although the first element may be disposed on the second element to contact the second element, a third element may be inserted between the first element and the second element.

[0039] Here, terms such as “first” and “second” may be used to distinguish one element from another. However, without departing from the technical spirit of this disclosure, the first element and the second element may be named arbitrarily as is convenient for those skilled in the art.

[0040] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. For example, unless the context clearly indicates otherwise, elements described in the singular are intended to include multiple elements. Furthermore, it will be understood in this disclosure that the terms “comprising” and “including” specify the presence of the stated features, integers, steps, operations, elements, components, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof.

[0041] In addition, unless “direct” is used, the terms “connection” and “coupled” can include two components being “connected” or “coupled” through one or more other components located between the two components.

[0042] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the exemplary embodiments pertain. It will also be understood that terms such as those defined in common dictionaries shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Any implementation described herein as “exemplary” is not necessarily to be construed as superior to or better than other implementations. Features of the various embodiments of this disclosure may be combined or integrated in part or in whole with each other and may be technically interacted and driven in a manner fully understood by one of those skilled in the art. Embodiments of this disclosure may be implemented independently of each other or jointly in an interdependent relationship.

[0043] (Implementation Method)

[0044] Figure 1 This is a schematic view of a display device according to an embodiment of the present disclosure. Figure 2 yes Figure 1 A magnified view of region K in the image. Figure 3 This is a view showing the circuitry of a sub-pixel in a display device according to an embodiment of the present disclosure.

[0045] Reference Figures 1 to 3 The display device according to embodiments of the present disclosure may include a display panel DP. The display panel DP can generate an image to be provided to a user. For example, the display panel DP may include pixel regions PA. The pixel regions PA may be arranged side by side along a first direction X and a second direction Y. The second direction Y may be a direction perpendicular to the first direction X.

[0046] Each pixel region PA can display various colors. For example, each pixel region PA may include a subpixel SP. Each subpixel SP can display a specific color. For example, each subpixel SP may be one of a red subpixel RS displaying red, blue subpixels BS1 and BS2 displaying blue, and a green subpixel GS displaying green. Each pixel region PA may include four subpixels SP arranged side by side along a first direction X and a second direction Y. For example, each pixel region PA may include a red subpixel RS, a first blue subpixel BS1 arranged side by side with the red subpixel RS along the second direction Y, a green subpixel GS arranged side by side with the first blue subpixel BS1 along the first direction Y, and a second blue subpixel BS2 arranged side by side with the green subpixel GS along the second direction Y. The second blue subpixel BS2 of each pixel region PA may be arranged side by side with the red subpixel RS of the corresponding pixel region PA along the first direction X. For example, in a display device according to an embodiment of the present disclosure, the red subpixel RS can be defined as a first subpixel, the first blue subpixel BS1 can be defined as a second subpixel, the green subpixel GS can be defined as a third subpixel, and the second blue subpixel BS2 can be defined as a fourth subpixel. In another embodiment of the display device according to the present disclosure, the red subpixel RS can be defined as a first subpixel, the second blue subpixel BS2 can be defined as a second subpixel, the green subpixel GS can be defined as a third subpixel, and the first blue subpixel BS1 can be defined as a fourth subpixel.

[0047] like Figure 3 As shown in the example, each of the sub-pixels SP can be controlled by signals applied through signal wirings GL, DL, and PL. For example, a drive circuit DC electrically connected to the signal wirings GL, DL, and PL and a light-emitting device 300 electrically connected to the drive circuit DC can be provided in each sub-pixel SP. For example, in a display device according to an embodiment of the present disclosure, the light-emitting device 300 of the red sub-pixel RS can be defined as a first light-emitting device, the light-emitting device 300 of the first blue sub-pixel BS1 can be defined as a second light-emitting device, the light-emitting device 300 of the green sub-pixel GS can be defined as a third light-emitting device, and the light-emitting device 300 of the second blue sub-pixel BS2 can be defined as a fourth light-emitting device. In a display device according to another embodiment of the present disclosure, the light-emitting device 300 of the red sub-pixel RS can be defined as a first light-emitting device, the light-emitting device 300 of the second blue sub-pixel BS2 can be defined as a second light-emitting device, the light-emitting device 300 of the green sub-pixel GS can be defined as a third light-emitting device, and the light-emitting device 300 of the first blue sub-pixel BS1 can be defined as a fourth light-emitting device.

[0048] The signal wiring GL, DL, and PL may include a gate line GL for applying a gate signal, a data line DL for applying a data signal, and a power supply line PL for supplying a power supply voltage. For example, the driving circuit DC can provide a driving current corresponding to the data signal to the light-emitting device 300 according to the gate signal using the power supply voltage. The driving current provided by the driving circuit DC to the light-emitting device 300 can be maintained for up to one frame. For example, the driving circuit DC may include a first thin-film transistor TR1, a second thin-film transistor TR2, and a storage capacitor Cst.

[0049] The first thin-film transistor TR1 can transmit a data signal to the second thin-film transistor TR2 according to the gate signal. For example, the first thin-film transistor TR1 can be used as a switching thin-film transistor. The second thin-film transistor TR2 can generate a drive current corresponding to the data signal by using the power supply voltage. For example, the second thin-film transistor TR2 can be used as a driving thin-film transistor. The operation of the second thin-film transistor TR2 can be maintained for one frame by a storage capacitor Cst. For example, the storage capacitor Cst can be electrically connected to the gate electrode and the source electrode of the second thin-film transistor TR2.

[0050] Figure 4 It is along Figure 2 The view captured by I-I'. Figure 5 yes Figure 4 An enlarged view of region R1 in the image. Figure 6 It is along Figure 2 The view captured by II-II'. Figure 7 yes Figure 6 An enlarged view of region R2 in the image.

[0051] Reference Figures 1 to 7 The display device according to embodiments of this disclosure may include a device substrate 100 supporting a driving circuit DC for each sub-pixel SP. The device substrate 100 may comprise various materials. For example, the device substrate 100 may be a wafer made of a semiconductor material such as silicon. The driving circuit for each sub-pixel SP may include a region disposed in the device substrate 100.

[0052] At least one insulating layer 110, 120, 130 and a barrier 140 for reducing or preventing accidental electrical connections can be provided on the device substrate 100. For example, a gate insulating layer 110, an interlayer insulating layer 120, a planarization layer 130 and a barrier 140 can be provided on the device substrate 100. A gate insulating layer 110 can be provided on the device substrate 100. An interlayer insulating layer 120 can be provided on the gate insulating layer 110. A planarization layer 130 can be provided on the interlayer insulating layer 120. The planarization layer 130 can contain a material with higher fluidity than the gate insulating layer 110 and the interlayer insulating layer 120. For example, the gate insulating layer 110 and the interlayer insulating layer 120 can contain inorganic insulating materials, and the planarization layer 130 can contain organic insulating materials. The planarization layer 130 can be provided on the driving circuit DC of each sub-pixel SP. The thickness difference caused by the driving circuit DC of each sub-pixel SP can be removed by the planarization layer 130. For example, the upper surface of the planarization layer 130 opposite to the device substrate 100 can be flat.

[0053] A light-emitting device 300 for each sub-pixel SP can be disposed on the upper surface of the planarization layer 130. Each sub-pixel SP's light-emitting device 300 can emit light displaying a specific color. For example, each sub-pixel SP's light-emitting device 300 may include a first electrode 310, a light-emitting unit 320, and a second electrode 330 sequentially stacked on the planarization layer 130 of the corresponding sub-pixel SP. For example, in a display device according to an embodiment of this disclosure, the light-emitting unit 320 of the red sub-pixel RS can be defined as a first light-emitting unit, the light-emitting unit 320 of the first blue sub-pixel BS1 can be defined as a second light-emitting unit, the light-emitting unit 320 of the green sub-pixel GS can be defined as a third light-emitting unit, and the light-emitting unit 320 of the second blue sub-pixel BS2 can be defined as a fourth light-emitting unit. In another embodiment of the display device according to the present disclosure, the light-emitting unit 320 of the red sub-pixel RS can be defined as a first light-emitting unit, the light-emitting unit 320 of the second blue sub-pixel BS2 can be defined as a second light-emitting unit, the light-emitting unit 320 of the green sub-pixel GS can be defined as a third light-emitting unit, and the light-emitting unit 320 of the first blue sub-pixel BS1 can be defined as a fourth light-emitting unit.

[0054] The first electrode 310 and the second electrode 330 may contain conductive materials. The second electrode 330 may contain a different material than the first electrode 310. For example, the first electrode 310 may be a transparent electrode made of a transparent conductive material such as ITO and IZO, and the second electrode 330 may be a semi-transparent electrode in which metals such as silver (Ag) and magnesium (Mg) are thinly formed. The first electrode 310 of each sub-pixel SP may be electrically connected to the driving circuit DC of the corresponding sub-pixel SP. For example, the first electrode 310 of each sub-pixel SP may be in direct contact with the upper surface of the planarization layer 130.

[0055] A fence 140 can be provided on the planarization layer 130. The first electrode 310 of each sub-pixel SP can be partially exposed through the fence 140. For example, the fence 140 can cover the edge of the first electrode 310 in each sub-pixel SP. The fence 140 can contain an insulating material. Therefore, in a display device according to an embodiment of the present disclosure, the first electrode 310 of each sub-pixel SP can be insulated from the first electrode 310 of adjacent sub-pixel SPs through the fence 140.

[0056] Each sub-pixel SP's light-emitting unit 320 can generate light with a brightness corresponding to the voltage difference between the first electrode 310 and the second electrode 330 of the corresponding sub-pixel SP. For example, each sub-pixel SP's light-emitting unit 320 can directly contact the portion of the first electrode 310 exposed through the fence 140 in the corresponding sub-pixel SP and the second electrode 330. That is, in the display device according to the embodiments of the present disclosure, the fence 140 can define light-emitting regions REA, BEA1, GEA, and BEA2 in each sub-pixel SP. For example, in the display device according to the embodiments of the present disclosure, the red light-emitting region REA of the red sub-pixel RS can be defined as the first light-emitting region, the first blue light-emitting region BEA1 of the first blue sub-pixel BS1 can be defined as the second light-emitting region, the green light-emitting region GEA of the green sub-pixel GS can be defined as the third light-emitting region, and the second blue light-emitting region BEA2 of the second blue sub-pixel BS2 can be defined as the fourth light-emitting region. In another embodiment of the display device according to the present disclosure, the red emitting area REA of the red sub-pixel RS can be defined as a first emitting area, the second blue emitting area BEA2 of the second blue sub-pixel BS2 can be defined as a second emitting area, the green emitting area GEA of the green sub-pixel GS can be defined as a third emitting area, and the first blue emitting area BEA1 of the first blue sub-pixel BS1 can be defined as a fourth emitting area. For example, in the display device according to an embodiment of the present disclosure, the fence 140 can be provided in the non-emitting area.

[0057] Each sub-pixel SP's light-emitting unit 320 may include two of the light-emitting stacks 321, 323, and 325, and one of the charge-generating layers 322 and 324. The charge-generating layer 322 may be disposed between the two light-emitting stacks 321 and 323 (e.g., ...). Figure 5 As shown in the example), the charge generation layer 324 can be disposed between the two light-emitting stacks 323 and 325 (as shown in the example). Figure 7 (As shown in the example). The light-emitting unit 320 of each sub-pixel SP may have the same stacking structure as the light-emitting unit 320 of the sub-pixel SP adjacent along the first direction X or the second direction Y. For example, in a display device according to an embodiment of the present disclosure, the light-emitting unit 320 on the red light-emitting region REA of the red sub-pixel RS may have a stacking structure of a first light-emitting stack 321, a first charge-generating layer 322, and a second light-emitting stack 323, and the light-emitting unit 320 on the second blue light-emitting region BEA2 of the second blue sub-pixel BS2 arranged side by side with the red light-emitting region REA along the first direction X may have the same stacking structure as the light-emitting unit 320 on the red light-emitting region REA. However, according to one embodiment of the present disclosure, the light-emitting unit 320 of each sub-pixel SP may have a different stacking structure than the light-emitting unit 320 of the sub-pixel SP adjacent along the second direction Y or the first direction X. For example, in a display device according to an embodiment of the present disclosure, the light-emitting unit 320 on the first blue light-emitting region BEA1 of the first blue sub-pixel BS1, which is arranged side-by-side with the red light-emitting region REA along the second direction Y, may have a stacked structure of a second light-emitting stack 323, a second charge-generating layer 324, and a third light-emitting stack 325. The light-emitting unit 320 on the green light-emitting region GEA of the green sub-pixel GS, which is arranged side-by-side with the first blue light-emitting region BEA1 along the first direction X, may have the same stacked structure as the light-emitting unit 320 on the first blue light-emitting region BEA1. That is, in a display device according to an embodiment of the present disclosure, the light-emitting unit 320 on the light-emitting regions REA, BEA1, GEA, and BEA2 of each sub-pixel SP may have a stacked structure of a first light-emitting stack 321, a first charge-generating layer 322, and a second light-emitting stack 323, or a stacked structure of a second light-emitting stack 323, a second charge-generating layer 324, and a third light-emitting stack 325.

[0058] The first charge generation layer 322 can supply electrons or holes to adjacent light-emitting stacks 321 and 323, and the second charge generation layer 324 can supply electrons or holes to adjacent light-emitting stacks 323 and 325. For example, each of the first charge generation layer 322 and the second charge generation layer 324 can have a stacked structure of an n-type charge generation layer 322n and a p-type charge generation layer 322p, and a stacked structure of an n-type charge generation layer 324n and a p-type charge generation layer 324p, respectively. Therefore, in the display device according to the embodiments of the present disclosure, each of the first light-emitting stack 321, the second light-emitting stack 323, and the third light-emitting stack 325 can generate light.

[0059] The light generated by the first light-emitting stack 321, the light generated by the second light-emitting stack 323, and the light generated by the third light-emitting stack 325 can display different colors. For example, in a display device according to an embodiment of the present disclosure, the first light-emitting stack 321 may include a first hole injection layer 321hi, a first hole transport layer 321ht, a red light-emitting material layer 321re, and a first electron transport layer 321et stacked sequentially; the second light-emitting stack 323 may include a second hole transport layer 323ht, a blue light-emitting material layer 323be, a second electron transport layer 323et, and a first electron injection layer 323ei stacked sequentially; and the third light-emitting stack 325 may include a third hole transport layer 325ht, a green light-emitting material layer 325ge, a third electron transport layer 325et, and a second electron injection layer 325ei stacked sequentially. Therefore, in the display device according to the embodiments of the present disclosure, the light-emitting unit 320 on the red light-emitting region REA and the second blue light-emitting region BEA2 can emit light in which the light generated by the red light-emitting material layer 321re and the light generated by the blue light-emitting material layer 323be are mixed, and the light-emitting unit 320 on the first blue light-emitting region BEA1 and the green light-emitting region GEA can emit light in which the light generated by the blue light-emitting material layer 323be and the light generated by the green light-emitting material layer 323ge are mixed.

[0060] Microcavity structures for emitting light of specific wavelengths can be formed within the light-emitting regions REA, BEA1, GEA, and BEA2 of each sub-pixel SP. For example, reflective electrodes 200R, 200B, and 200G can be disposed between the driving circuit DC (e.g., including transistor TR2) of each sub-pixel SP and the first electrode 310. The color displayed by the light emitted from the light-emitting regions REA, BEA1, GEA, and BEA2 of each sub-pixel SP can be determined by the positions of the reflective electrodes 200R, 200B, and 200G on the corresponding sub-pixel SP. For example, in a display device according to an embodiment of the present disclosure, the planarization layer 130 may have a stacked structure of a first planarization layer 131, a second planarization layer 132, a third planarization layer 133, and a fourth planarization layer 134. A red reflective electrode 200R for a red light-emitting region REA may be disposed between the first planarization layer 131 and the second planarization layer 132. A blue reflective electrode 200B for a first blue light-emitting region BEA1 and a second blue light-emitting region BEA2 may be disposed on the third planarization layer 133. A green reflective electrode 200G for a green light-emitting region GEA may be disposed between the second planarization layer 132 and the third planarization layer 133. The upper surface of the blue reflective electrode 200B opposite to the device substrate 100 may be exposed through the fourth planarization layer 134. For example, the fourth planarization layer 134 may surround the side surface of the blue reflective electrode 200B. The blue reflective electrode 200B may be in direct contact with the first electrode 310 of the first blue light-emitting region BEA1 or the second blue light-emitting region BEA2. Therefore, in the display device according to the embodiments of the present disclosure, red light can be emitted through the second electrode 330 of each red light-emitting region REA, blue light can be emitted through the second electrode 330 of each of the first blue light-emitting region BEA1 and the second blue light-emitting region BEA2, and green light can be emitted through the second electrode 330 of each green light-emitting region GEA.

[0061] Separating trenches ST can be provided between the fences 140. The separating trenches ST can have a trench shape that removes a portion of the planarization layer 130. For example, the separating trenches ST can penetrate the fourth planarization layer 134 and a portion of the third planarization layer 133. The separating trenches ST can extend along the second direction Y. The first charge generation layer 322 and the second charge generation layer 324 can be separated by the separating trenches ST between adjacent light-emitting regions REA, BEA1, GEA, and BEA2 along the first direction X. For example, in a display device according to an embodiment of this disclosure, such as... Figure 4 and Figure 5 As shown, the first charge generation layer 322 can be separated by a separating trench ST between the red emitting region REA and the second blue emitting region BEA2, and as... Figure 6As shown, the second charge generation layer 324 can be separated by a separating trench ST between the first blue light-emitting region BEA1 and the green light-emitting region GEA. Therefore, in the display device according to the embodiment of the present disclosure, leakage current in the first direction X caused by the first charge generation layer 322 and the second charge generation layer 324 can be reduced or prevented.

[0062] Each light-emitting region REA, BEA1, GEA, and BEA2 disposed relatively close to the device substrate 100 may have a first light-emitting stack 321 or a second light-emitting stack 323 separated from the first light-emitting regions REA, BEA1, GEA, and BEA2 adjacent along the first direction X by a separating trench ST. For example, in a display device according to an embodiment of the present disclosure, the first light-emitting stack 321 of each second blue light-emitting region BEA2 may be separated from the first light-emitting stack 321 of the adjacent red light-emitting region REA by a separating trench ST, and the second light-emitting stack 323 of each green light-emitting region GEA may be separated from the second light-emitting stack 323 of the adjacent first blue light-emitting region BEA1 by a separating trench ST. Therefore, in a display device according to an embodiment of the present disclosure, an air gap AR may be formed inside the separating trench ST.

[0063] The second light-emitting stack 323 of the first blue light-emitting region BEA1 and the green light-emitting region GEA can be disposed closer to the device substrate 100 than the second light-emitting stack 323 of the red light-emitting region REA and the second blue light-emitting region BEA2. The second light-emitting stack 323 can extend along the second direction Y. For example, the second light-emitting stack 323 of the first blue light-emitting region BEA1 can be in direct contact with the second light-emitting stack 323 of the red light-emitting region REA between the red light-emitting region REA and the first blue light-emitting region BEA1, and the second light-emitting stack 323 of the green light-emitting region GEA can be in direct contact with the second light-emitting stack 323 of the second blue light-emitting region BEA2 between the second blue light-emitting region BEA2 and the green light-emitting region GEA. The second charge-generating layer 324 can be spaced apart from the first charge-generating layer 322. For example, the second light-emitting stack 323 can extend between the first charge-generating layer 322 and the second charge-generating layer 324. The second charge-generating layer 324 can be insulated from the first charge-generating layer 322 through the second light-emitting stack 323. For example, the side surfaces of the first charge generation layer 322 extending along the first direction X and the second charge generation layer 324 extending along the first direction X can be covered by the second light-emitting stack 323. That is, in the display device according to an embodiment of the present disclosure, the side surfaces of the first charge generation layer 322 and the second charge generation layer 324 disposed between the red light-emitting region REA and the first blue light-emitting region BEA1 in each pixel region PA, and between the second blue light-emitting region BEA2 and the green light-emitting region GEA in each pixel region PA, can be covered by the second light-emitting stack 323 of the corresponding pixel region PA. For example, in the display device according to an embodiment of the present disclosure, the second light-emitting stack 323 can directly contact the side surfaces of the first charge generation layer 322 extending along the first direction X and the second charge generation layer 324 extending along the first direction X, thereby separating the side surfaces of the first charge generation layer 322 and the second charge generation layer 324 in the second direction Y, such as... Figure 4 and Figure 6 As shown. Therefore, in the display device according to the embodiments of the present disclosure, leakage current in the second direction Y caused by the first charge generation layer 322 and the second charge generation layer 324 can be reduced or prevented.

[0064] The signal applied to the second electrode 330 of each sub-pixel SP can be the same as the signal applied to the second electrode 330 of the adjacent sub-pixel SP. For example, the second electrode 330 of each sub-pixel SP can be electrically connected to the second electrode 330 of the adjacent sub-pixel SP. Therefore, in the display device according to the embodiments of the present disclosure, the brightness of the light emitted from the light-emitting areas REA, BEA1, GEA, and BEA2 of each sub-pixel SP can be determined by the data signal applied to the driving circuit of the corresponding sub-pixel SP.

[0065] An encapsulation structure 400 can be provided on the light-emitting device 300 of each sub-pixel SP. The encapsulation structure 400 can reduce or prevent damage to the light-emitting device 300 in each sub-pixel SP due to external impact and moisture. The encapsulation structure 400 can have a multi-layer structure. For example, the encapsulation structure 400 may include a first encapsulation layer 410, a second encapsulation layer 420, and a third encapsulation layer 430 stacked in sequence. The second encapsulation layer 420 may contain a material with higher fluidity than the first encapsulation layer 410 and the third encapsulation layer 430. For example, the first encapsulation layer 410 and the third encapsulation layer 430 may contain inorganic insulating materials, and the second encapsulation layer 420 may contain organic insulating materials. The thickness difference caused by the light-emitting device 300 of each sub-pixel SP can be eliminated by the second encapsulation layer 420. For example, the upper surface of the encapsulation structure 400 opposite to the device substrate 100 may be flat.

[0066] Color filters 500R, 500G, and 500B can be disposed on the package structure 400. Each of the color filters 500R, 500G, and 500B can overlap with the light-emitting regions REA, GEA, BEA1, and BEA2 of one of the sub-pixels SP. Each of the color filters 500R, 500G, and 500B can contain a different material than the adjacent color filters 500R, 500G, and 500B. Light passing through the color filters 500R, 500G, and 500B of each sub-pixel SP can display the same color as the light emitted by the microcavity structure formed in the corresponding sub-pixel SP. For example, the color filters 500R, 500G, and 500B can include a red color filter 500R overlapping with the red light-emitting region REA, a blue color filter 500B overlapping with the first blue light-emitting region REA1 or the second blue light-emitting region BEA2, and a green color filter 500G overlapping with the green light-emitting region GEA. Therefore, in a display device according to an embodiment of the present disclosure, the color reproduction of each sub-pixel SP can be improved.

[0067] Color filters 500R, 500G, and 500B can be arranged side-by-side. The color filters 500R, 500G, and 500B for each sub-pixel SP can have a larger size than the light-emitting regions REA, GEA, BEA1, and BEA2 of the corresponding sub-pixel SP. For example, the side surfaces of color filters 500R, 500G, and 500B can be in direct contact with the side surfaces of adjacent color filters 500R, 500G, and 500B on non-light-emitting areas. Therefore, in the display device according to the embodiments of this disclosure, light leakage from the color filters 500R, 500G, and 500B can be reduced or prevented. Therefore, in the display device according to the embodiments of this disclosure, the quality of the image recognized by the user can be improved.

[0068] An optical planarization layer 600 can be provided on color filters 500R, 500G, and 500B. The optical planarization layer 600 can reduce or prevent damage to color filters 500R, 500G, and 500B due to external impacts and moisture. The optical planarization layer 600 can contain an insulating material. For example, the optical planarization layer 600 can contain an organic insulating material. The thickness difference caused by color filters 500R, 500G, and 500B can be removed by the optical planarization layer 600. For example, the upper surface of the optical planarization layer 600 opposite to the device substrate 100 can be flat.

[0069] Therefore, the display device according to the embodiments of the present disclosure may include a planarization layer 130 on a device substrate 100 and light-emitting devices 300 on the planarization layer 130 of the light-emitting regions REA, BEA1, GEA and BEA2. Each light-emitting device 300 may have a light-emitting unit 320 having a stacked structure of a first light-emitting stack 321, a first charge-generating layer 322 and a second light-emitting stack 323 or a stacked structure of a second light-emitting stack 323, a second charge-generating layer 324 and a third light-emitting stack 325. The first charge-generating layer 322 and the second charge-generating layer 324 may be separated by a separating trench ST formed in the planarization layer 130 between adjacent light-emitting regions REA, BEA1, GEA and BEA2 along the first direction X. The side surfaces of the first charge-generating layer 322 extending along the first direction X and the side surfaces of the second charge-generating layer 324 extending along the first direction X may be covered by the second light-emitting stack 323. Therefore, in the display device according to the embodiments of the present disclosure, leakage current in the first direction X caused by the first charge generation layer 322 and the second charge generation layer 324 can be reduced or prevented by the separating trench ST, and leakage current in the second direction Y caused by the first charge generation layer 322 and the second charge generation layer 324 can be reduced or prevented by the second light-emitting stack 323. Therefore, in the display device according to the embodiments of the present disclosure, the degradation of image quality caused by leakage current can be reduced or minimized.

[0070] Figures 8 to 13 This is a view illustrating a method of forming a display device according to an embodiment of the present disclosure.

[0071] Reference Figure 2 , Figure 4 , Figure 6 as well as Figures 8 to 13 A method for forming a display device according to an embodiment of the present disclosure is described. First, as... Figure 2 , Figure 8 and Figure 9 As shown, a method for forming a display device according to an embodiment of the present disclosure may include the following steps: forming a gate insulating layer 110, an interlayer insulating layer 120, a driving circuit DC, a planarization layer 130, reflective electrodes 200R, 200G and 200B, a first electrode 310 and a gate 140; and forming a first light-emitting stack 321 and a first charge-generating layer 322 on the red light-emitting region REA and the second blue light-emitting region BEA2 of each pixel region PA.

[0072] Each of the driving circuits DC may include a second thin-film transistor TR2. The planarization layer 130 may include a separating trench ST disposed between the red emitting region REA and the second blue emitting region BEA2 in each pixel region PA, and between the first blue emitting region BEA1 and the green emitting region GEA.

[0073] The first light-emitting stack 321 of the second blue light-emitting region BEA2 can be formed simultaneously with the first light-emitting stack 321 of the red light-emitting region REA. The first charge-generating layer 322 of the second blue light-emitting region BEA2 can be formed simultaneously with the first charge-generating layer 322 of the red light-emitting region REA. For example, the step of forming the first light-emitting stack 321 and the first charge-generating layer 322 on the red light-emitting region REA and the second blue light-emitting region BEA2 of each pixel region PA may include: arranging a first mask pattern on the device substrate 100 on which the gate 140 is formed to expose the red light-emitting region REA and the second blue light-emitting region BEA2 of each pixel region PA; and forming the first light-emitting stack 321 and the first charge-generating layer 322 using the first mask pattern.

[0074] The first mask pattern can be a fine metal mask (FMM). The first mask pattern cannot include areas overlapping with non-light-emitting areas disposed between the red light-emitting area REA and the second blue light-emitting area BEA2 in each pixel region PA. For example, the separating trench ST disposed between the red light-emitting area REA and the second blue light-emitting area BEA2 in each pixel region PA can be exposed through the first mask pattern. Therefore, in the method of forming a display device according to an embodiment of this disclosure, the first light-emitting stack 321 of the second blue light-emitting area BEA2 can be separated from the first light-emitting stack 321 of the red light-emitting area REA by the separating trench ST, and the first charge-generating layer 322 of the second blue light-emitting area BEA2 can be separated from the first charge-generating layer 322 of the red light-emitting area REA by the separating trench ST, without additional processing. In other words, in the method of forming a display device according to an embodiment of the present disclosure, a first light-emitting stack 321 separated from the adjacent first light-emitting stack 321 can be simultaneously formed on a red light-emitting region REA and a second blue light-emitting region BEA2 having an opening size smaller than the first mask pattern, and a first charge-generating layer 322 separated from the adjacent first charge-generating layer 322 can be simultaneously formed on the first light-emitting stack 321 on either the red light-emitting region REA or the second blue light-emitting region BEA2. Therefore, in the method of forming a display device according to an embodiment of the present disclosure, processing efficiency and resolution can be improved.

[0075] like Figure 10 and Figure 11As shown, a method for forming a display device according to an embodiment of the present disclosure may include the step of forming a second light-emitting stack 323 on a device substrate 100 on which a first light-emitting stack 321 and a first charge-generating layer 322 are formed.

[0076] A second light-emitting stack 323 can be simultaneously formed on the red light-emitting area REA, the first blue light-emitting area BEA1, the green light-emitting area GEA, and the second blue light-emitting area BEA2 of each pixel area PA. The second light-emitting stack 323 may include areas disposed on non-light-emitting areas. For example, in the method of forming a display device according to an embodiment of the present disclosure, the second light-emitting stack 323 can be formed without using a mask pattern. That is, in the method of forming a display device according to an embodiment of the present disclosure, the step of forming a mask pattern for forming the second light-emitting stack 323 can be omitted. Therefore, in the method of forming a display device according to an embodiment of the present disclosure, processing efficiency can be improved. The first light-emitting stack 321 and the first charge-generating layer 322 formed on the red light-emitting area REA and the second blue light-emitting area BEA2 can be covered by the second light-emitting stack 323. The side surfaces of the first light-emitting stack 321 extending along the first direction X and the side surfaces of the first charge-generating layer 322 extending along the first direction X can be in direct contact with the second light-emitting stack 323.

[0077] like Figure 12 and Figure 13 As shown, a method for forming a display device according to an embodiment of the present disclosure may include the following steps: forming a second charge generation layer 324 and a third light emission stack 325 on the portion of the second light emission stack 323 that overlaps with the first blue light emission region BEA1 of each pixel region PA and the portion of the second light emission stack 323 that overlaps with the green light emission region GEA of each pixel region PA.

[0078] The second charge generation layer 324 of the green emitting region GEA can be formed simultaneously with the second charge generation layer 324 of the first blue emitting region BEA1. The third light-emitting stack 325 of the green emitting region GEA can be formed simultaneously with the third light-emitting stack 325 of the first blue emitting region BEA1. For example, the steps of forming the second charge generation layer 324 and the third light-emitting stack 325 may include: arranging a second mask pattern on the device substrate 100 on which the second light-emitting stack 323 is formed, exposing the first blue emitting region BEA1 and the green emitting region GEA of each pixel region PA; and forming the second charge generation layer 324 and the third light-emitting stack 325 using the second mask pattern.

[0079] The second mask pattern can be a fine metal mask (FMM). The second mask pattern cannot include areas overlapping with the non-light-emitting areas between the first blue light-emitting area BEA1 and the green light-emitting area GEA of each pixel region PA. For example, the separating trench ST disposed between the first blue light-emitting area BEA1 and the green light-emitting area GEA of each pixel region PA can be exposed through the second mask pattern. Therefore, in the method of forming a display device according to an embodiment of this disclosure, the second charge generation layer 324 of the green light-emitting area GEA can be separated from the second charge generation layer 324 of the first blue light-emitting area BEA1 by the separating trench ST, and the third light-emitting stack 325 of the green light-emitting area GEA can be separated from the third light-emitting stack 325 of the first blue light-emitting area BEA1 by the separating trench ST, without additional processing. In other words, in the method of forming a display device according to an embodiment of the present disclosure, a second charge generation layer 324, separated from the adjacent second charge generation layer 324, can be simultaneously formed on a first blue light-emitting region BEA1 and a green light-emitting region GEA, which have an opening size smaller than that of the second mask pattern. Furthermore, a third light-emitting stack 325, separated from the adjacent third light-emitting stack 325, can be simultaneously formed on the second charge generation layer 324 on either the first blue light-emitting region BEA1 or the green light-emitting region GEA. Therefore, in the method of forming a display device according to an embodiment of the present disclosure, processing efficiency and resolution can be improved.

[0080] like Figure 4 and Figure 6 As shown, a method for forming a display device according to an embodiment of the present disclosure may include: forming a second electrode 330 on a light-emitting unit 320 composed of a first light-emitting stack 321, a first charge-generating layer 322, a second light-emitting stack 323, a second charge-generating layer 324, and a third light-emitting stack 325 to form a light-emitting device 300; forming an encapsulation structure 400 on the second electrode 330; forming color filters 500R, 500G, and 500B on the encapsulation structure 400; and forming an optical planarization layer 600 on the color filters 500R, 500G, and 500B.

[0081] Therefore, in the method of forming a display device according to an embodiment of the present disclosure, the second light-emitting stack 323 of each sub-pixel SP can be formed simultaneously. Therefore, in the method of forming a display device according to an embodiment of the present disclosure, processing efficiency can be improved. That is, in the method of forming a display device according to an embodiment of the present disclosure, production energy can be reduced through process optimization. Furthermore, in the method of forming a display device according to an embodiment of the present disclosure, each of the light-emitting regions REA, BEA1, GEA, and BEA2 can have a smaller size than the opening of the first mask pattern and the opening of the second mask pattern. Therefore, in the method of forming a display device according to an embodiment of the present disclosure, resolution can be improved.

[0082] like Figure 1 As shown, in a display device according to an embodiment of the present disclosure, the display panel DP may include a display area AA and a border area BZ disposed outside the display area AA. A pixel area PA may be disposed within the display area AA. For example, the display area AA may be surrounded by the border area BZ. A gate driver GD electrically connected to a gate line GL and a data driver electrically connected to a data line DL may be disposed outside the display area AA. Figure 1 (not shown in the image) and the power supply unit electrically connected to the power supply voltage supply line PL ( Figure 1 (Not shown in the diagram). At least one of the gate driver GD, data driver, and power supply unit can be disposed on the bezel region BZ. For example, the display device according to an embodiment of the present disclosure can be a GIP (gate in panel) type display device, wherein the gate driver GD can be formed in the bezel region BZ.

[0083] The display device according to an embodiment of the present disclosure is described as follows: the driving circuit DC of each sub-pixel SP consists of a first thin-film transistor TR1, a second thin-film transistor TR2, and a storage capacitor Cst. However, in another embodiment of the display device according to the present disclosure, the driving circuit DC of each sub-pixel SP may include multiple switching thin-film transistors. For example, in another embodiment of the display device according to the present disclosure, the driving circuit DC of each sub-pixel SP may further include a third thin-film transistor for initializing the storage capacitor Cst of the corresponding sub-pixel SP according to a gate signal. Therefore, in another embodiment of the display device according to the present disclosure, the flexibility in configuring each driving circuit DC can be increased.

[0084] The display device according to an embodiment of the present disclosure is described as follows: the device substrate 100 is a wafer formed of a semiconductor material such as silicon. However, in another embodiment of the display device according to the present disclosure, the device substrate 100 may comprise glass or plastic. The driving circuit DC for each sub-pixel SP may be formed on a buffer insulating layer covering the upper surface of the device substrate 100. Therefore, in the display device according to another embodiment of the present disclosure, the freedom of material selection for the device substrate 100 and the configuration of each driving circuit DC can be increased.

[0085] A display device according to an embodiment of the present disclosure is described as follows: a first light-emitting stack 312 includes a red light-emitting material layer 321re, a second light-emitting stack 323 includes a blue light-emitting material layer 323be, and a third light-emitting stack 325 includes a green light-emitting material layer 325ge. However, in another embodiment of the display device according to the present disclosure, the light-emitting material layers 321re, 323be, and 325ge of the first light-emitting stack 321, the second light-emitting stack 323, and the third light-emitting stack 325 can be combined in various ways. For example, in another embodiment of the display device according to the present disclosure, the first light-emitting stack 321 may include a blue light-emitting material layer 323be, the second light-emitting stack 323 may include a green light-emitting material layer 325ge, and the third light-emitting stack 325 may include a red light-emitting material layer 321re. Alternatively, in a display device according to another embodiment of the present disclosure, the first light-emitting stack 321 may include a green light-emitting material layer 325ge, the second light-emitting stack 323 may include a red light-emitting material layer 321re, and the third light-emitting stack 325 may include a blue light-emitting material layer 323be. Therefore, in a display device according to another embodiment of the present disclosure, the degree of freedom in configuring the light-emitting units 320 on each sub-pixel SP can be increased.

[0086] A display device according to an embodiment of the present disclosure is described as follows: the first hole injection layer 321hi of the first light-emitting stack 321 can be separated by a separating trench ST. However, in another embodiment of the display device according to the present disclosure, a hole injection layer in contact with the first electrode 310 can be simultaneously formed on the light-emitting regions REA, BEA1, GEA, and BEA2 of each sub-pixel SP. For example, in another embodiment of the display device according to the present disclosure, a common hole injection layer 320hi can be provided on the first electrode 310 of each sub-pixel SP. The first light-emitting stack 321 of the red light-emitting region REA and the second blue light-emitting region BEA2 may include a first hole transport layer 321ht, a red light-emitting material layer 321re, and a first electron transport layer 321et sequentially stacked on the common hole injection layer 320hi, and the second light-emitting stack 323 of the first blue light-emitting region BEA1 and the green light-emitting region GEA may include a second hole transport layer 323ht, a blue light-emitting region 323be, and a second electron transport layer 323et sequentially stacked on the common hole injection layer 320hi, as shown. Figure 14 and Figure 15 As shown. Therefore, in a display device according to another embodiment of the present disclosure, processing efficiency can be effectively improved.

[0087] A display device according to an embodiment of the present disclosure is described as follows: the second electrode 330 directly contacts the first electron injection layer 323ei of the second light-emitting stack 323 or the second electron injection layer 325ei of the third light-emitting stack 325. However, in another embodiment of the display device according to the present disclosure, an electron injection layer in contact with the second electrode 330 can be formed simultaneously on the light-emitting regions REA, BEA1, GEA, and BEA2 of each sub-pixel SP. For example, in another embodiment of the display device according to the present disclosure, a common electron injection layer 320ei can be formed on the red light-emitting region REA, the first blue light-emitting region BEA1, the green light-emitting region GEA, and the second blue light-emitting region BEA2, and the second electrode 330 can be formed on the common electron injection layer 320ei, such as... Figure 14 and Figure 15 As shown.

[0088] The common electron injection layer 320ei can directly contact the second electron transport layer 323et of the red emitting region REA and the second blue emitting region BEA2. The third electron transport layer 325et of the first blue emitting region BEA1 and the green emitting region GEA can directly contact the common electron injection layer 320ei. Therefore, in a display device according to another embodiment of the present disclosure, processing efficiency can be effectively improved.

[0089] In another embodiment of the display device according to this disclosure, the display panel (DP) can be used in various electronic devices. For example, such as Figure 16 and Figure 17 As shown, another embodiment of the display device according to this disclosure can be a head-mounted display device (HMD), wherein a display panel DP is housed in an image element 910, and the image element 910 is fixed in front of a user's eyes by a mounting element 920. The mounting element 920 may have a shape such as the temple of an eyeglass frame. For example, the mounting element 920 may have a shape extending in a certain direction from the edge of the image element 910. The mounting element 920 may be coupled to the image element 910 by a coupling element 930. For example, the coupling element 930 may have a plate shape, including an area coupled to the image element 910 and an area coupled to the mounting element 920. The coupling element 930 may be disposed inside the image element 910 and the mounting element 920.

[0090] The eyepiece lens OL disposed on one side of the image element 910 may include a left-eye lens LL disposed in front of the user's left eye and a right-eye lens LR disposed in front of the user's right eye. A blank space may be provided between the display panel DP and the eyepiece lens OL. For example, the display panel DP may be disposed close to the first surface of the image element 910, and the left-eye lens LL and the right-eye lens LR may be fixed at a second surface of the image element 910 opposite to the first surface of the image element 910. A gap-maintaining element 940 may be disposed inside the coupling element 930 to maintain the space between the display panel DP and the eyepiece lens OL. The gap-maintaining element 940 may be disposed parallel to the coupling element 930. For example, the gap-maintaining element 940 may be in direct contact with the coupling element 930.

[0091] A first fixing element 951 for fixing the display panel DP can be provided in the image element 910. For example, the first fixing element 951 can be in direct contact with the first surface of the image element 910. Therefore, in a display device according to another embodiment of the present disclosure, movement of the display panel DP and the eyepiece lens OL due to user movement can be effectively reduced or prevented. Therefore, in a display device according to another embodiment of the present disclosure, the visibility of the image recognized by the user can be improved.

[0092] In another embodiment of the display device according to this disclosure, an image from the display panel DP and an actual object disposed outside the first surface of the image element 910 can be simultaneously provided to the user. The first surface of the image element 910 may have high transmittance. For example, at least one optical lens 960 may be disposed between the display panel DP and the eyepiece lens OL. The at least one optical lens 960 may be spaced apart from the display panel DP and the eyepiece lens OL. For example, a second fixing element 952 for fixing the at least one optical lens 960 may be provided in the image element 910. The image from the display panel DP can be displayed on the actual object disposed in front of the user through the at least one optical lens 960. Therefore, in another embodiment of the display device according to this disclosure, accidents caused by obstruction of the user's field of vision can be reduced or prevented.

[0093] Another embodiment of the display device according to this disclosure is described as follows: the mounting element 920 has a shape such as the temple of an eyeglass frame. However, in another embodiment of the display device according to this disclosure, the mounting element 920 can have various shapes. For example, in another embodiment of the display device according to this disclosure, the mounting element 920 can have a headgear shape that surrounds the user's head. Therefore, in another embodiment of the display device according to this disclosure, the degree of freedom in the type of electronic device in which a display panel DP is used can be increased.

[0094] Therefore, a display device according to embodiments of the present disclosure may include a planarization layer and a light-emitting device on a device substrate. The light-emitting unit of the light-emitting device may include a charge-generating layer disposed between a first light-emitting stack and a second light-emitting stack. The charge-generating layer may be separated by a separating trench extending along a first direction of the planarization layer. Furthermore, the side surface of the charge-generating layer extending along a second direction perpendicular to the first direction may be covered by either the first or second light-emitting stack. Therefore, in a display device according to embodiments of the present disclosure, leakage current in the first and second directions caused by the charge-generating layer can be reduced or prevented. Therefore, in a display device according to embodiments of the present disclosure, the reduction in image quality caused by leakage current can be reduced or minimized. Furthermore, in a display device according to embodiments of the present disclosure, production energy can be reduced through process optimization.

[0095] It will be apparent to those skilled in the art that various modifications and variations can be made to this disclosure without departing from the technical spirit or scope thereof. Therefore, the embodiments of this disclosure are intended to cover all modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A display device, comprising: A device substrate, the device substrate including a first light-emitting region, a second light-emitting region and a third light-emitting region, wherein the second light-emitting region is arranged side by side with the first light-emitting region along a first direction, and the third light-emitting region is arranged side by side with the first light-emitting region along a second direction perpendicular to the first direction; A planarization layer on the device substrate, the planarization layer overlapping the first light-emitting region, the second light-emitting region and the third light-emitting region; A first light-emitting device on the planarization layer of the first light-emitting region, the first light-emitting device comprising a first light-emitting unit disposed between a first electrode and a second electrode; A second light-emitting device on the planarization layer of the second light-emitting region, the second light-emitting device comprising a second light-emitting unit disposed between the first electrode and the second electrode; as well as A third light-emitting device is located on the planarization layer in the third light-emitting region. The third light-emitting device includes a third light-emitting unit disposed between the first electrode and the second electrode. Each of the first light-emitting unit and the second light-emitting unit has a stacked structure comprising a first light-emitting stack, a first charge-generating layer, and a second light-emitting stack. The planarization layer includes a separating trench that separates the first charge generation layer of the first light-emitting unit and the first charge generation layer of the second light-emitting unit between the first light-emitting region and the second light-emitting region. The side surface of the first charge generation layer is covered by the second light-emitting stack between the first light-emitting region and the third light-emitting region.

2. The display device according to claim 1, wherein The second light-emitting stack contacts the side surface of the first charge-generating layer extending along the first direction.

3. The display device according to claim 1, wherein The second luminescent region emits a different color than the first luminescent region.

4. The display device according to claim 3, wherein The second light-emitting stack produces light that displays a different color than the first light-emitting stack.

5. The display device according to claim 3, wherein The third light-emitting unit includes a second charge-generating layer on the second light-emitting stack and a third light-emitting stack on the second charge-generating layer, and The side surface of the second charge generation layer is covered by the second light-emitting stack between the first light-emitting region and the third light-emitting region.

6. The display device of claim 5, wherein, The third light-emitting stack produces light that displays a different color than the first and second light-emitting stacks.

7. The display device according to claim 5, wherein The second light-emitting stack of the third light-emitting unit is in contact with the second light-emitting stack of the first light-emitting unit between the first light-emitting region and the third light-emitting region.

8. The display device of claim 7, wherein, The third luminescent region achieves the same color as the second luminescent region.

9. A display device, comprising: A device substrate, the device substrate including a first light-emitting region and a second light-emitting region, the second light-emitting region being arranged side by side with the first light-emitting region; A first light-emitting device on the first light-emitting region of the device substrate, the first light-emitting device comprising a first electrode, a first light-emitting stack on the first electrode, a first charge-generating layer on the first light-emitting stack, a second light-emitting stack on the first charge-generating layer, and a second electrode on the second light-emitting stack; as well as A second light-emitting device is located on the second light-emitting region of the device substrate. The second light-emitting device includes a first electrode, a second light-emitting stack on the first electrode, a second charge-generating layer on the second light-emitting stack, a third light-emitting stack on the second charge-generating layer, and a second electrode on the third light-emitting stack. The second light-emitting stack extends between the first charge-generating layer and the second charge-generating layer.

10. The display device of claim 9, wherein, The portion of the second light-emitting stack that overlaps with the second light-emitting region is positioned closer to the device substrate than the portion of the second light-emitting stack that overlaps with the first light-emitting region.

11. The display device according to claim 9, further comprising: A planarization layer is provided between the device substrate and the first light-emitting device, and the planarization layer also extends between the device substrate and the second light-emitting device; as well as A third light-emitting device on the planarization layer of the third light-emitting region, the third light-emitting device having a stacked structure of the first electrode, the second light-emitting stack, the second charge-generating layer, the third light-emitting stack, and the second electrode. The third light-emitting region is arranged side by side with the second light-emitting region along the first direction. The second light-emitting region is arranged side-by-side with the first light-emitting region along a second direction perpendicular to the first direction. The planarization layer includes a separating trench that separates the second charge generation layer of the second light-emitting device and the second charge generation layer of the third light-emitting device between the second light-emitting region and the third light-emitting region. The side surface of the second charge generation layer is covered by the second light-emitting stack between the first light-emitting region and the second light-emitting region.

12. The display device according to claim 11, wherein, The second luminescent region has a different color than the first luminescent region, and the third luminescent region has a different color than both the first and second luminescent regions.

13. The display device according to claim 11, further comprising a fourth light-emitting device on the planarization layer of the fourth light-emitting region. in, The fourth light-emitting device has a stacked structure comprising the first electrode, the first light-emitting stack, the first charge-generating layer, the second light-emitting stack, and the second electrode. The fourth light-emitting region is arranged side by side with the first light-emitting region along the first direction. The third light-emitting region is arranged side by side with the fourth light-emitting region along the second direction. Wherein, the first charge generation layer of the fourth light-emitting device and the first charge generation layer of the first light-emitting device are separated by the separating trench between the first light-emitting region and the fourth light-emitting region, and The side surface of the first charge generation layer is covered by the second light-emitting stack between the third light-emitting region and the fourth light-emitting region.

14. The display device according to claim 13, wherein, The fourth luminescent region achieves the same color as the second luminescent region.

15. The display device according to claim 13, wherein, The second light-emitting stack in the fourth light-emitting region is in contact with the second light-emitting stack in the third light-emitting region between the third light-emitting region and the fourth light-emitting region.

16. The display device according to claim 9, wherein, The first light-emitting stack has a common hole injection layer in contact with the first electrode, and / or the second light-emitting stack and the third light-emitting stack have a common electron injection layer in contact with the second electrode.

17. A method of forming a display device, comprising: A device substrate is arranged, the device substrate including a first light-emitting region, a second light-emitting region, a third light-emitting region and a fourth light-emitting region, wherein the third light-emitting region is arranged side by side with the second light-emitting region along a first direction, the second light-emitting region is arranged side by side with the first light-emitting region along a second direction perpendicular to the first direction, the fourth light-emitting region is arranged side by side with the first light-emitting region along the first direction, and the third light-emitting region is arranged side by side with the fourth light-emitting region along the second direction. A planarization layer is formed on the device substrate, the planarization layer overlapping with the first light-emitting region, the second light-emitting region, the third light-emitting region and the fourth light-emitting region, wherein the planarization layer includes separation trenches respectively disposed between the first light-emitting region and the fourth light-emitting region and / or between the second light-emitting region and the third light-emitting region; A first light-emitting stack and a first charge-generating layer are formed on the first light-emitting region and the fourth light-emitting region; A second light-emitting stack is simultaneously formed on the first light-emitting region, the second light-emitting region, the third light-emitting region, and the fourth light-emitting region; and A second charge generation layer and a third light-emitting stack are formed on the portion of the second light-emitting stack that overlaps with the second light-emitting region and on the portion of the second light-emitting stack that overlaps with the third light-emitting region.

18. The method according to claim 17, wherein, The first light-emitting stack and the first charge-generating layer are covered by the second light-emitting stack such that the side surfaces of the first light-emitting stack and the side surfaces of the first charge-generating layer extending along the first direction are in direct contact with the second light-emitting stack.

19. The method of claim 17, wherein, The step of forming the first light-emitting stack and the first charge-generating layer on the first light-emitting region and the fourth light-emitting region includes: arranging a first mask pattern on the device substrate with a fence to expose the first light-emitting region and the fourth light-emitting region; and forming the first light-emitting stack and the first charge-generating layer using the first mask pattern, wherein the first mask pattern does not include a region overlapping with a non-light-emitting region disposed between the first light-emitting region and the fourth light-emitting region; and The step of forming the second charge generation layer and the third light-emitting stack includes: arranging a second mask pattern on the device substrate to expose the second light-emitting region and the third light-emitting region; and using the second mask pattern to form the second charge generation layer and the third light-emitting stack, wherein the second mask pattern does not include a region overlapping with the non-light-emitting region between the second light-emitting region and the third light-emitting region.

20. The method of claim 17, wherein, The step of simultaneously forming a second light-emitting stack on the first light-emitting region, the second light-emitting region, the third light-emitting region, and the fourth light-emitting region includes: forming the second light-emitting stack without using a mask pattern.

21. The method according to claim 17, wherein, The step of forming the planarization layer on the device substrate includes forming an air gap inside the partition trench.

22. A display panel, comprising: A device substrate, wherein, for each pixel, the device substrate includes a first light-emitting region, a second light-emitting region, a third light-emitting region, and a fourth light-emitting region, wherein the first light-emitting region, the second light-emitting region, the third light-emitting region, and the fourth light-emitting region are arranged in a 2×2 matrix along the row direction and in a column direction perpendicular to the row direction; The light-emitting device in each light-emitting area; and A planarization layer extending between the light-emitting device and the device substrate. In the 2×2 matrix, the light-emitting devices in the first row each include a first electrode, a first light-emitting stack disposed on the first electrode, a first charge-generating layer disposed on the first light-emitting stack, a second light-emitting stack disposed on the first charge-generating layer, and a second electrode disposed on the second light-emitting stack. The light-emitting device in the second row of the 2×2 matrix includes a first electrode, a second light-emitting stack disposed on the first electrode, a second charge-generating layer disposed on the second light-emitting stack, a third light-emitting stack disposed on the second charge-generating layer, and a second electrode disposed on the third light-emitting stack. The first charge generation layer of the light-emitting device is separated by a partition trench formed at least partially in the planarization layer between corresponding light-emitting regions, and the second light-emitting stack extends between the first charge generation layer and the second charge generation layer.

23. A head-mounted display device comprising an image element, the image element comprising a display device according to any one of claims 1 to 16, and the image element being fixed in front of a user's eyes.

Images