Display device

Abstract

A display device including a charge generation layer is provided. The display device can include a device substrate. A plurality of pixel regions can be defined in the device substrate. A first light emitting region, a second light emitting region, and a third light emitting region can be defined in each of the pixel regions. Light emitting devices can be disposed on each of the light emitting regions. Each of the light emitting devices can include a first light emitting stack, the charge generation layer, and a second light emitting stack sequentially stacked. A planarization layer can be disposed between the device substrate and the light emitting devices. The planarization layer can include a separation trench disposed between the first light emitting region and the second light emitting region of each of the pixel regions and an opening overlapping the third light emitting region of each of the pixel regions. The charge generation layer can be separated by the separation trench and a thickness difference caused by the opening. Accordingly, in the display device, current leakage due to the charge generation layer can be prevented.

Description

Technical Field

[0001] This disclosure relates to an apparatus, and in particular, for example, but not limited to, a display apparatus in which each light-emitting device includes a charge-generating layer. Background Technology

[0002] 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 that displays a specific color. For example, the light-emitting device may include a light-emitting unit disposed between a first electrode and a second electrode. The light-emitting unit may include a light-emitting stack. Each light-emitting stack 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 can include various colors.

[0003] The descriptions provided in the background section should not be construed as prior art simply because they are mentioned in or associated with that section. The background section may include information describing one or more aspects of the subject matter art, and the descriptions in that section do not limit this disclosure. Summary of the Invention

[0004] 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.

[0005] The purpose of this disclosure is to provide a display device that can prevent or reduce current leakage caused by the charge generation layer.

[0006] Additional advantages, objects, and features of this disclosure will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art upon examination of the following, or may be learned from practice of this disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of the structures particularly pointed out in the written description and claims herein and in the accompanying drawings.

[0007] To achieve these objectives and other advantages, and in accordance with the purposes of this disclosure, as embodied and broadly described herein, a display device comprising a device substrate is provided. A partition wall, a planarization layer, and light-emitting devices are disposed on the device substrate. The partition wall defines a first light-emitting region, a second light-emitting region, and a third light-emitting region in each pixel region. The light-emitting devices overlap with the first, second, and third light-emitting regions of each pixel region. The planarization layer includes a separating trench disposed between the first and second light-emitting regions in each pixel region and an opening overlapping with the third light-emitting region of each pixel region. Each light-emitting device includes a first light-emitting stack, a first charge-generating layer, and a second light-emitting stack sequentially stacked. The separating trench separates the first charge-generating layer between the first and second light-emitting regions in each pixel region. The first charge-generating layer between the first and third light-emitting regions in each pixel region is separated by a thickness difference caused by the opening. The first charge-generating layer between the second and third light-emitting regions in each pixel region is separated by a thickness difference caused by the opening.

[0008] The light generated by the second light-emitting layer can display a different color than the light generated by the first light-emitting layer. The first, second, and third light-emitting regions of each pixel area can achieve different colors.

[0009] The second light-emitting area of ​​each pixel region can be arranged side-by-side with the first light-emitting area of ​​the corresponding pixel region in the first direction. The third light-emitting area of ​​each pixel region can be arranged side-by-side with the first and second light-emitting areas of the corresponding pixel region in a second direction perpendicular to the first direction.

[0010] The dividing groove can extend in the second direction. The length of the dividing groove in the second direction can be longer than the length of the first light-emitting area of ​​each pixel region in the second direction and the length of the second light-emitting area of ​​each pixel region in the second direction.

[0011] The length of each of the first and second light-emitting regions in each pixel region in the second direction can be greater than its length in the first direction. The length of the third light-emitting region in each pixel region in the second direction can be shorter than its length in the first direction.

[0012] The first charge generation layer in the third light-emitting region of each pixel region can contact the first charge generation layer in the third light-emitting region of the adjacent pixel region in the first direction.

[0013] The device substrate may include a display area and a bezel area. A pixel area may be disposed within the display area. The bezel area may be disposed outside the display area. The device substrate may include pad areas on the bezel area. A first charge generation layer may be electrically connected to the pad areas.

[0014] The first, second, and third reflective electrodes can be disposed between the device substrate and the light-emitting device. The first reflective electrode can overlap with the first light-emitting region of each pixel region. The second reflective electrode can overlap with the second light-emitting region of each pixel region. The second reflective electrode can be disposed on a different layer than the first reflective electrode. The third reflective electrode can overlap with the third light-emitting region of each pixel region. The third reflective electrode can be disposed on the same layer as the first reflective electrode.

[0015] The sub-embankment layer can be disposed between the device substrate and the planarization layer. The sub-embankment layer can overlap with the third light-emitting region of each pixel region. The sub-embankment layer may include a through-hole overlapping with at least one of the third reflective electrodes.

[0016] The edge of the third reflective electrode can be covered by the sub-embankment layer.

[0017] The light-emitting device may include a first light-emitting device, a second light-emitting device, and a third light-emitting device. The first light-emitting device may overlap with the first light-emitting area of ​​each pixel region. The second light-emitting device may overlap with the second light-emitting area of ​​each pixel region. The third light-emitting device may overlap with the third light-emitting area of ​​each pixel region. The distance between the third reflective electrode and the third light-emitting device may be different from the distance between the first reflective electrode and the first light-emitting device.

[0018] The distance between the device substrate and the second light-emitting device can be the same as the distance between the device substrate and the first light-emitting device. The distance between the device substrate and the third light-emitting device can be different from the distance between the device substrate and the second light-emitting device.

[0019] Each of the light-emitting devices may include a first electrode and a second electrode. The first electrode may be disposed between a device substrate and a first light-emitting stack. The second light-emitting stack may be disposed between a first charge-generating layer and the second electrode. The first electrode of the second light-emitting device may include the same material as the first electrode of the first light-emitting device. The first electrode of the third light-emitting device may include the same material as the first electrode of the second light-emitting device. The distance between the device substrate and the second electrode of the third light-emitting device may be smaller than the distance between the device substrate and the second electrode of the first light-emitting device, and the distance between the device substrate and the second electrode of the second light-emitting device.

[0020] The first electrode of the third light-emitting device can contact the upper surface of the third reflective electrode opposite to the device substrate.

[0021] Each light-emitting device may include a second charge-generating layer and a third light-emitting stack. The second charge-generating layer may be disposed in the second light-emitting region. The third light-emitting stack may be disposed on the second charge-generating layer. The second charge-generating layer in the second light-emitting region of each pixel region may be in contact with the second charge-generating layer in the first light-emitting region of the corresponding pixel region. The second charge-generating layer in the third light-emitting region of each pixel region may be in contact with the second charge-generating layers in the first light-emitting region and the second charge-generating layers in the second light-emitting region of the corresponding pixel region.

[0022] The third light-emitting layer produces light that can display a different color than the first and second light-emitting layers.

[0023] An encapsulation structure can be disposed on the light-emitting device. A first color filter and a second color filter can be disposed on the encapsulation structure. The first color filter can overlap with the first light-emitting area of ​​each pixel region. The second color filter can overlap with the second light-emitting area of ​​each pixel region. An optical insulating layer can be disposed on the first and second color filters. Light passing through the second color filter can display a different color than light passing through the first color filter. The optical insulating layer can contact the upper surface of the encapsulation structure opposite to the device substrate on the third light-emitting area of ​​each pixel region.

[0024] The third light-emitting area of ​​each pixel region can be a blue light-emitting area to achieve blue.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative, and are intended to provide further explanation of the claimed inventive concept. Attached Figure Description

[0026] The accompanying drawings are included to provide a further understanding of this disclosure and are incorporated in and constitute a part of this application. The drawings illustrate one or more embodiments of this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:

[0027] Figure 1 This is a schematic view illustrating a display device according to an embodiment of the present disclosure;

[0028] Figure 2 yes Figure 1 A magnified view of region K in the image;

[0029] 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;

[0030] Figure 4 It is along Figure 2 The view captured by I-I';

[0031] Figure 5 yes Figure 4 Enlarged view of region R1 in the image;

[0032] Figures 6 to 14 This is a view illustrating a method of forming a display device according to an embodiment of the present disclosure; and

[0033] Figures 15 to 20 This is a view showing a display device according to another embodiment of the present disclosure. Detailed Implementation

[0034] In the following detailed description with reference to the accompanying drawings, the details relating to the above-described objectives, technical configurations, and operational effects of embodiments of the present disclosure will become clear. The drawings illustrate some embodiments of the present disclosure. Embodiments of the present disclosure are provided herein to satisfactorily convey the technical spirit of the present disclosure to those skilled in the art; therefore, the present disclosure may be implemented in other forms and is not limited to the embodiments described below.

[0035] 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 should be understood that when a first element is referred to as "on the second element," the first element may be disposed on the second element to contact the second element, and a third element may also be inserted between the first and second elements.

[0036] Here, terms such as “first” and “second” may be used to distinguish one element from another. However, without departing from the technical concept of this disclosure, the first element and the second element may be named arbitrarily as is convenient for those skilled in the art.

[0037] 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 should be further understood in this disclosure that the terms “comprising” and “including” specify the presence of the stated features, values, steps, operations, elements, components, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, values, steps, operations, elements, components, and / or combinations thereof.

[0038] Furthermore, unless “direct” is used, the terms “connection” and “linkage” can include two components “connected” or “linked” through one or more other components located between the two components.

[0039] 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 the 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 expressly defined herein.

[0040] Reference will now be made in detail to embodiments of this disclosure, examples of which are illustrated in the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations associated with this document will be omitted where such descriptions would be deemed to unnecessarily obscure the essential points of the inventive concept. 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 same reference numerals always denote the same elements. The names of the elements used in the following description may be chosen solely for convenience of writing the specification and may therefore differ from the names used in actual products.

[0041] In the following description, if a detailed description of a well-known function or configuration related to this document is determined to unnecessarily obscure the essential points of the inventive concept, such detailed description will be omitted or may be briefly discussed.

[0042] Any implementation described as an "example" in this article is not necessarily to be interpreted as preferred or superior to other implementations.

[0043] Furthermore, when referring to any size, relative size, etc., the numerical values ​​or corresponding information of a component or feature (e.g., level, range, etc.) should be considered to include tolerances or error ranges that may be caused by various factors (e.g., process factors, internal or external influences, noise, etc.), even if no relevant description is specified. Additionally, the term "may" fully encompasses all the meanings of the term "able to".

[0044] When describing temporal relationships, discontinuous cases may be included if the temporal order is described as such as “after,” “following,” “next,” and “before,” unless more restrictive terms such as “just,” “immediately,” or “directly” are used.

[0045] 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 only A; only B; only C; any or some combinations of A, B, and C; or all of A, B, and C.

[0046] 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, and the third element” means a combination of all three listed elements, a combination of any two of the three elements, and each individual element, the first element, the second element, or the third element.

[0047] As will be fully understood by those skilled in the art, the features of the various embodiments of this disclosure can be joined or combined in part or in whole, and can interoperate and be technology-driven in various ways. The embodiments of this disclosure can be performed independently of each other, or they can be performed together in an interdependent relationship.

[0048] (Implementation Method)

[0049] 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 the K region. 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.

[0050] refer to 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 provided to a user. For example, the display panel DP may include a plurality of pixel regions PA. The plurality of pixel regions PA may be arranged side by side in a first direction X and a second direction Y. The second direction Y may be a direction perpendicular to the first direction X.

[0051] Each pixel region PA can display various colors. For example, each pixel region PA can include multiple subpixels SP. Each subpixel SP can display a specific color. For example, each subpixel SP can be one of a red subpixel R-SP that displays red, a green subpixel G-SP that displays green, and a blue subpixel B-SP that displays blue. Each pixel region PA can include three subpixels SP. For example, a red subpixel R-SP, a green subpixel G-SP arranged side by side with the red subpixel R-SP in a first direction, and a blue subpixel B-SP arranged side by side with the red subpixel R-SP and the green subpixel G-SP in a second direction Y.

[0052] Various signals can be applied to each sub-pixel SP through signal wiring GL, DL, and PL. For example, a driving circuit DC electrically connected to the signal wiring GL, DL, and PL and a light-emitting device 300 electrically connected to the driving circuit DC can be configured in each sub-pixel SP. In the display device according to an embodiment of the present disclosure, the light-emitting device 300 of the red sub-pixel R-SP can be a first light-emitting device, the light-emitting device 300 of the green sub-pixel G-SP can be a second light-emitting device, and the light-emitting device 300 of the blue sub-pixel B-SP can be a third light-emitting device.

[0053] The signal wiring GL, DL, and PL may include a gating line GL for applying a gating signal, a data line DL for applying a data signal, and a power supply line PL for providing a first power supply voltage. For example, the driving circuit DC may use the first power supply voltage to provide a driving current corresponding to the data signal to the light-emitting device 300 according to the gating signal. The driving current provided by the driving circuit DC to the light-emitting device 300 can be maintained for one frame. The driving circuit DC may include a first thin-film transistor TR1, a second thin-film transistor TR2, and a storage capacitor Cst.

[0054] The first thin-film transistor TR1 can transmit a data signal to the second thin-film transistor TR2 according to a gating 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 a first 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 and source of the second thin-film transistor TR2.

[0055] Figure 4 It is along Figure 2 The view captured by I-I'. Figure 5 yes Figure 4 A magnified view of region R1.

[0056] Reference Figures 1 to 5 The display device according to embodiments of the present disclosure may include a device substrate 100 supporting a driving circuit DC for each sub-pixel SP. The device substrate 100 may include 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 within the device substrate 100. At least one insulating layer 110, 120, 130, 140, 150, and 160 for preventing or reducing accidental electrical connections may be disposed on the device substrate 100. For example, a gate insulating layer 110, an interlayer insulating layer 120, a lower planarization layer 130, an intermediate insulating layer 140, an upper planarization layer 150, and a spacer 160 may be disposed on the device substrate 100.

[0057] A gate insulating layer 110 may be disposed on a device substrate 100. An interlayer insulating layer 120 may be disposed on the gate insulating layer 110. A lower planarization layer 130 may be disposed on the interlayer insulating layer 120. The lower planarization layer 130 may include 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 may include inorganic insulating materials, and the lower planarization layer 130 may include organic insulating materials.

[0058] An intermediate insulating layer 140 may be disposed on the lower planarization layer 130. An upper planarization layer 150 may be disposed on the intermediate insulating layer 140. A partition 160 may be disposed on the upper planarization layer 150. The intermediate insulating layer 140, the upper planarization layer 150, and the partition 160 may include insulating material. The partition 160 may define light-emitting regions R-EA, G-EA, and B-EA in each sub-pixel SP. For example, in a display device according to an embodiment of the present disclosure, the partition 160 may define a red light-emitting region R-EA in the red sub-pixel R-SP of each pixel region PA, a green light-emitting region G-EA in the green sub-pixel G-SP of each pixel region PA, and a blue light-emitting region B-EA in the blue sub-pixel B-SP of each pixel region PA. In a display device according to an embodiment of the present disclosure, the red light-emitting area R-EA of each pixel area PA may be a first light-emitting area, the green light-emitting area G-EA of each pixel area PA may be a second light-emitting area, and the blue light-emitting area B-EA of each pixel area PA may be a third light-emitting area.

[0059] The light-emitting device 300 of each sub-pixel SP can be disposed on the portion of the upper planarization layer 150 that overlaps with the light-emitting regions R-EA, G-EA, and B-EA of the corresponding sub-pixel SP. For example, in a display device according to an embodiment of the present disclosure, the light-emitting device 300 may include a first light-emitting device overlapping with the red light-emitting region R-EA of each pixel region PA, a second light-emitting device overlapping with the green light-emitting region G-EA of each pixel region PA, and a third light-emitting device overlapping with the blue light-emitting region B-EA of each pixel region PA. The light-emitting device 300 of each sub-pixel SP can emit light displaying a specific color. For example, the light-emitting device 300 of each sub-pixel SP may include a first electrode 310, a light-emitting unit 320, and a second electrode 330 stacked sequentially.

[0060] The first electrode 310 and the second electrode 330 may include conductive materials. The second electrode 330 may include a material different from that of 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 translucent 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. The first electrode 310 of each sub-pixel SP may be insulated from the first electrodes 310 of adjacent sub-pixels SP. For example, the edge of the first electrode 310 on each sub-pixel SP may be covered by a partition 160.

[0061] 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 a portion of the first electrode 310 exposed by the partition wall 160 and the second electrode 330 within the light-emitting regions R-EA, G-EA, and B-EA of the corresponding sub-pixel SP. Therefore, in the display device according to an embodiment of the present disclosure, light can be generated within the light-emitting regions R-EA, G-EA, and B-EA defined by the partition wall 160 in each sub-pixel SP. For example, the region disposed between the light-emitting regions R-EA, G-EA, and B-EA can be a non-light-emitting region in which no light is generated. In the display device according to an embodiment of the present disclosure, the red light-emitting region R-EA of each pixel region PA can be a first light-emitting region, the green light-emitting region G-EA of each pixel region PA can be a second light-emitting region, and the blue light-emitting region B-EA of each pixel region PA can be a third light-emitting region.

[0062] Each sub-pixel SP's light-emitting unit 320 may include a first light-emitting stack 321, a charge-generating layer 322, and a second light-emitting stack 323 stacked sequentially. The charge-generating layer 322 may provide electrons or holes to the first light-emitting stack 321 and the second light-emitting stack 323. For example, the charge-generating layer 322 may have a stacked structure of an n-type charge-generating layer 322n and a p-type charge-generating layer 322p. The n-type charge-generating layer 322n of each sub-pixel SP may be disposed between the first light-emitting stack 321 and the corresponding p-type charge-generating layer 322p of the sub-pixel SP. Therefore, in the display device according to an embodiment of the present disclosure, each of the first light-emitting stack 321 and the second light-emitting stack 323 may generate light.

[0063] The light generated by the second light-emitting stack 323 of each sub-pixel SP can display a different color than the light generated by the first light-emitting stack 321 of the corresponding sub-pixel SP. The light emitted from the light-emitting unit 320 of each sub-pixel SP can display the same color as the light emitted from the light-emitting unit 320 of the adjacent sub-pixel SP. For example, in a display device according to an embodiment of the present disclosure, the first light-emitting stack 321 may include a hole injection layer 321hi, a first hole transport layer 321ht, a blue light-emitting material layer 321be, and a first electron transport layer 321et stacked in sequence, and the second light-emitting stack 323 may include a second hole transport layer 323ht, a red light-emitting material layer 323re, a green light-emitting material layer 323ge, a second electron transport layer 323et, and an electron injection layer 323ei stacked in sequence. Therefore, in the display device according to the embodiments of the present disclosure, the light emitted from the light-emitting unit 320 of each sub-pixel SP can be white light, which is a mixture of light generated by the blue light-emitting material layer 321be, light generated by the red light-emitting material layer 323re, and light generated by the green light-emitting material layer 323ge.

[0064] Microcavity structures emitting light with specific wavelengths can be formed in the light-emitting regions R-EA, G-EA, and B-EA of each sub-pixel SP. For example, reflective electrodes 200R, 200G, and 200B can be disposed between the driving circuit DC and the first electrode 310 of each sub-pixel SP. Reflective electrodes 200R, 200G, and 200B can include materials with high reflectivity. For example, reflective electrodes 200R, 200G, and 200B can include metal. Reflective electrodes 200R, 200G, and 200B can include a red reflective electrode 200R overlapping the red light-emitting region R-EA of each pixel region PA, a green reflective electrode 200G overlapping the green light-emitting region G-EA of each pixel region PA, and a blue reflective electrode 200B overlapping the blue light-emitting region B-EA of each pixel region PA. In a display device according to an embodiment of the present disclosure, the red reflective electrode 200R of each pixel region PA may be a first reflective electrode, the green reflective electrode 200G of each pixel region PA may be a second reflective electrode, and the blue reflective electrode 200B of each pixel region PA may be a third reflective electrode.

[0065] The green reflective electrode of each pixel region PA can be disposed on a different layer than the red reflective electrode 200R and blue reflective electrode 200B of the corresponding pixel region PA. The blue reflective electrode 200B of each pixel region PA can be disposed on the same layer as the red reflective electrode 200R of the corresponding pixel region PA. For example, the red reflective electrode 200R and blue reflective electrode 200B of each pixel region PA can be disposed between the lower planarization layer 130 and the intermediate insulating layer 140, and the green reflective electrode 200G of each pixel region PA can be disposed between the intermediate insulating layer 140 and the upper planarization layer 150.

[0066] The upper planarization layer 150 may include a separating trench ST between the red emitting region R-EA and the green emitting region G-EA of each pixel region PA. The separating trench ST may have a shape that removes a portion of the upper planarization layer 150. The separating trench ST may extend in the second direction Y. For example, the length of the separating trench ST in the second direction Y may be longer than the length of the red emitting region R-EA of each pixel region PA in the second direction Y and the length of the green emitting region G-EA of each pixel region PA in the second direction Y. Therefore, in the display device according to the embodiment of the present disclosure, the charge generation layer 322 can be separated by the separating trench ST between the red emitting region R-EA and the green emitting region G-EA of each pixel region PA. Therefore, in the display device according to the embodiment of the present disclosure, leakage of current through the charge generation layer 322 in the first direction X can be prevented or reduced.

[0067] The upper planarization layer 150 may include an opening BH1 overlapping the blue emitting region B-EA of each pixel region PA. The opening BH1 may penetrate the intermediate insulating layer 140. The opening BH may overlap with the blue reflective electrode 200B on the blue emitting region B-EA of each pixel region PA. For example, the first electrode 310 on the blue emitting region B-EA of each pixel region PA may extend into the opening BH1. Therefore, in the display device according to the embodiment of the present disclosure, a thickness difference caused by the opening BH1 may be formed between the red emitting region R-EA and the blue emitting region B-EA of each pixel region PA and between the green emitting region G-EA and the blue emitting region B-EA of each pixel region PA. For example, in the display device according to the embodiment of the present disclosure, the charge generation layer 322 may be separated by the thickness difference caused by the opening BH between the red emitting region R-EA and the blue emitting region B-EA of each pixel region PA and between the green emitting region G-EA and the blue emitting region B-EA of each pixel region PA. Therefore, in the display device according to the embodiments of the present disclosure, current leakage through the charge generation layer 322 in the second direction Y can be prevented or reduced.

[0068] A sub-embankment layer SB can be disposed within the blue emitting region B-EA of each pixel region PA. The sub-embankment layer SB may include an insulating material. The sub-embankment layer SB may include a material that is etch-selective to the intermediate insulating layer 140 and the upper planarization layer 150. The sub-embankment layer SB can be disposed between the blue reflective electrode 200B and the first electrode 310 overlapping the blue emitting region B-EA of each pixel region PA. The blue reflective electrode 200B of each pixel region PA may be partially exposed by the sub-embankment layer SB. For example, the sub-embankment layer SB may include a through-hole BH2 overlapping at least a portion of the blue reflective electrode 200B in each pixel region PA. The through-hole BH2 of the sub-embankment layer SB in each pixel region PA may overlap with the opening BH1 of the corresponding pixel region PA. For example, the first electrode 310 on the blue emitting region B-EA of each pixel region PA may be in direct contact with the blue reflective electrode 200B of the corresponding pixel region PA in the through-hole BH2 of the sub-embankment layer SB on the corresponding pixel region PA. The edge of the blue reflective electrode 200B on each pixel region PA can be covered by the sub-embankment layer SB. Therefore, in the display device according to an embodiment of the present disclosure, the distance between the green reflective electrode 200G and the first electrode 310 in the green emitting regions G-EA of each pixel region PA can be different from the distance between the red reflective electrode 200R and the first electrode 310 in the red emitting regions R-EA of the corresponding pixel region PA, and the distance between the red reflective electrode 200R and the first electrode 310 in the red emitting regions R-EA of each pixel region PA can be different from the distance between the blue reflective electrode 200B and the first electrode 310 in the blue emitting regions B-EA of the corresponding pixel region PA. For example, in the display device according to an embodiment of the present disclosure, red light can be emitted through the second electrode 330 of the red emitting regions R-EA of each pixel region PA, green light can be emitted through the second electrode 330 of the green emitting regions G-EA of each pixel region PA, and blue light can be emitted through the second electrode 330 of the blue emitting regions B-EA of each pixel region PA.

[0069] The thickness difference formed between the red emitting region R-EA and the blue emitting region B-EA in each pixel region PA, and between the green emitting region G-EA and the blue emitting region B-EA in each pixel region PA, can be increased by the through-hole BHe in the sub-embankment layer SB. Therefore, in the display device according to the embodiment of the present disclosure, the charge generation layer 322 can be effectively separated between the red emitting region R-EA and the blue emitting region B-EA in each pixel region PA, and between the green emitting region G-EA and the blue emitting region B-EA in each pixel region PA. Therefore, in the display device according to the embodiment of the present disclosure, current leakage caused by the charge generation layer 322 in the second direction Y can be effectively prevented or reduced.

[0070] 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 adjacent sub-pixels SP. For example, a second power supply voltage can be applied to the second electrode 330 of each sub-pixel SP. The second power supply voltage can be different from the first power supply voltage. For example, the first power supply voltage can be a positive power supply voltage (VDD), and the second power supply voltage can be a negative power supply voltage (VSS). The second electrode 330 of each sub-pixel SP can be electrically connected to the second electrode 330 of adjacent sub-pixels SP in the second direction Y. For example, the second electrode 330 of each sub-pixel SP can be spaced apart from the second electrode 330 of adjacent sub-pixels SP in the first direction X.

[0071] An encapsulation structure 400 can be disposed on the light-emitting device 300 of each sub-pixel SP. The encapsulation structure 400 can prevent or reduce 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 sequentially. The second encapsulation layer 420 may include 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 include inorganic insulating materials, and the second encapsulation layer 420 may include organic insulating materials.

[0072] 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 R-EA, G-EA, and B-EA of one of the sub-pixels SP. Light passing through each color filter 500R, 500G, and 500B can display a different color than light passing through adjacent color filters 500R, 500G, and 500B. For example, color filters 500R, 500G, and 500B can comprise materials different from those of adjacent color filters 500R, 500G, and 500B. Light passing through color filters 500R, 500G, and 500B in each sub-pixel SP can display the same color as light emitted by a microcavity structure formed in the corresponding sub-pixel SP. For example, color filters 500R, 500G, and 500B may include a red color filter 500R overlapping the red emitting region R-EA of each pixel region PA, a green color filter 500G overlapping the green emitting region G-EA of each pixel region PA, and a blue color filter 500B overlapping the blue emitting region B-EA of each pixel region PA. In the display device according to an embodiment of the present disclosure, the red color filter 500R may be a first color filter, the green color filter may be a second color filter, and the blue color filter may be a third color filter. Therefore, in the display device according to an embodiment of the present disclosure, the color reproducibility of each sub-pixel SP can be improved.

[0073] Color filters 500R, 500G, and 500B can be arranged side-by-side. Each of the color filters 500R, 500G, and 500B can have a larger size than the corresponding light-emitting areas R-EA, G-EA, and B-EA. For example, the side surface of each color filter 500R, 500G, and 500B can directly contact the side surface of the adjacent color filter 500R, 500G, and 500B in the non-light-emitting area. Therefore, in the display device according to the embodiment of the present disclosure, light leakage that does not pass through the color filters 500R, 500G, and 500B can be prevented or reduced. Therefore, in the display device according to the embodiment of the present disclosure, the quality of the image provided to the user can be improved.

[0074] An optical insulating layer 600 may be disposed on color filters 500R, 500G, and 500B. The optical insulating layer 600 can prevent or reduce damage to color filters 500R, 500G, and 500B due to external impact. The optical insulating layer 600 may include an insulating material. For example, the optical insulating layer 600 may include an organic insulating material.

[0075] Therefore, the display device according to the embodiments of the present disclosure may include an upper planarization layer 150, a partition 160, and a light-emitting device 300 on a device substrate 100, wherein each light-emitting unit 320 of the light-emitting device 300 may have a first light-emitting stack 321, a charge-generating layer 322, and a second light-emitting stack 323, and wherein the upper planarization layer 150 may include a separating trench ST disposed between the red light-emitting region R-EA and the green light-emitting region G-EA of each pixel region and an opening BH1 overlapping with the blue light-emitting region B-EA of each pixel region PA. Therefore, in the display device according to the embodiments of the present disclosure, the charge-generating layer can be separated between the red light-emitting region R-EA and the green light-emitting region G-EA of each pixel region PA by the separating trench ST, and the charge-generating layer 322 can be separated between the red light-emitting region R-EA and the blue light-emitting region B-EA of each pixel region PA and between the green light-emitting region G-EA and the blue light-emitting region B-EA of each pixel region PA by the thickness difference caused by the opening BH1. In other words, in the display device according to the embodiments of the present disclosure, leakage current through the charge generation layer 322 in the first direction X can be prevented or reduced by the partition trench ST, and leakage current through the charge generation layer 322 in the second direction Y can be prevented or reduced by the thickness difference caused by the opening BH1. Therefore, in the display device according to the embodiments of the present disclosure, the degradation of image quality caused by leakage current can be minimized or reduced.

[0076] like Figure 1 As shown, the display panel DP of the display device according to an embodiment of the present disclosure may include a display area AA and a bezel area BZ. A plurality of pixel areas PA may be disposed within the display area AA. The bezel area BZ may be disposed outside the bezel area BZ. For example, the display area AA may be surrounded by the bezel area BZ. A gate driver GD electrically connected to a gate line GL, a data driver electrically connected to a data line DL, and a power supply unit electrically connected to a power supply voltage supply line PL may be disposed outside the display area AA. At least one of the gate driver GD, the data driver, and the power supply unit may be disposed on the bezel area BZ. For example, the display device according to an embodiment of the present disclosure may be a GIP (gate in panel) type display device, wherein the gate driver GD is formed in the bezel area BZ.

[0077] The first pad region PADm for applying external signals can be disposed in the border region BZ. For example, a data driver can be electrically connected to a data line DL through the first pad region PADm. The second electrode 330 of each sub-pixel SP can be electrically connected to the second electrode 330 of adjacent sub-pixels in the first direction X through a first common wiring CL1 disposed on the border region BZ. Therefore, in the display device according to the embodiment of the present disclosure, the difference in the second power supply voltage applied to the second electrode 330 of each sub-pixel SP can be minimized or reduced. The second electrode 330 of each sub-pixel SP can be electrically connected to a power supply unit. For example, in the display device according to the embodiment of the present disclosure, the first common wiring CL1 connected to the second electrode 330 of each sub-pixel SP can be electrically connected to the power supply unit through the first pad region PADm.

[0078] In the display device according to embodiments of the present disclosure, the blue emitting region B-EA of each pixel region PA may have a planar shape different from the red emitting region R-EA and the green emitting region G-EA of the corresponding pixel region PA. For example, in the display device according to embodiments of the present disclosure, the red emitting region R-EA and the green emitting region G-EA of each pixel region PA may have a planar shape extending in the second direction Y, and the blue emitting region B-EA of each pixel region PA may have a planar shape extending in the first direction X, such as... Figure 2 As shown. The red emitting region R-EA and the green emitting region G-EA of each pixel region PA can have a longer length in the second direction Y than in the first direction X. The blue emitting region B-EA of each pixel region PA can have a shorter length in the second direction Y than in the first direction X.

[0079] The charge generation layer 322 on the blue emitting area B-EA of each pixel region PA can extend in the first direction X. For example, the charge generation layer 322 on the blue emitting area B-EA of each pixel region PA can be in direct contact with the charge generation layer 322 on the blue emitting area B-EA of an adjacent pixel region PA in the first direction X. Second pad areas PADs electrically connected to the charge generation layer 322 on the blue emitting area B-EA of each pixel region PA can be disposed on the border area BZ. The charge generation layer 322 on the blue emitting area B-EA of each pixel region PA can be connected to the charge generation layer 322 on the blue emitting area B-EA of an adjacent pixel region PA in the second direction via a second common wiring CL2 on the border area BZ. Therefore, in the display device according to the embodiment of the present disclosure, a signal having a specific voltage can be applied to the charge generation layer 322 on the blue emitting area B-EA of each pixel region PA. For example, in the display device according to an embodiment of the present disclosure, the blue light emitted from the blue emitting region B-EA of each pixel region PA can have a brightness corresponding to the voltage difference between the first electrode 310 and the charge generation layer 322 on the blue emitting region B-EA of the corresponding pixel region PA. Therefore, in the display device according to an embodiment of the present disclosure, the driving voltage of the blue emitting region B-EA of each pixel region PA can be increased. Furthermore, in the display device according to an embodiment of the present disclosure, the characteristics of the blue light emitted from the blue emitting region B-EA of each pixel region PA can be improved, and the load on the blue emitting material layer 321be applied to the blue emitting region B-EA of each pixel region PA can be reduced. In other words, in the display device according to an embodiment of the present disclosure, the overall lifespan can be increased.

[0080] Figures 6 to 14 This is a view illustrating a method of forming a display device according to an embodiment of the present disclosure.

[0081] Reference Figures 2 to 4 as well as Figures 6 to 14 A method for forming a display device according to an embodiment of the present disclosure is described. First, as... Figure 2 , Figure 3 and Figure 6 As shown, the method for forming a display device according to an embodiment of the present disclosure may include the steps of forming a gate insulating layer 110, an interlayer insulating layer 120, a driving circuit DC and a lower planarization layer 130 on a device substrate 100, and the steps of forming a red reflective electrode 200R overlapping with the red light-emitting regions R-EA of each pixel region PA and a blue reflective electrode 200B overlapping with the blue light-emitting regions B-EA of each pixel region PA on the lower planarization layer 130.

[0082] Each driving circuit DC may include a second thin-film transistor TR2. The blue reflective electrode 200B of each pixel region PA may be formed simultaneously with the red reflective electrode 200R of each pixel region PA. For example, the steps of forming the red reflective electrode 200R and the blue reflective electrode 200B of each pixel region PA may include forming a conductive layer on the lower planarization layer 130 using a material with high reflectivity and patterning the conductive layer.

[0083] like Figure 7 As shown, the method for forming a display device according to an embodiment of the present disclosure may include the step of forming a sub-embankment layer SB on a lower planarization layer 130 that covers a blue reflective electrode 200B for each pixel region PA.

[0084] The sub-embankment layer SB can be formed within the blue emitting region B-EA of each pixel region PA. For example, the red reflective electrode 200R of each pixel region PA can be spaced apart from the sub-embankment layer SB. The sub-embankment layer SB may not overlap with the red emitting region R-EA and the green emitting region G-EA of each pixel region PA.

[0085] like Figure 8 As shown, a method for forming a display device according to an embodiment of the present disclosure may include the step of forming an intermediate insulating layer 140 on a device substrate 100 in which a sub-embankment layer SB is formed.

[0086] The red reflective electrode 200R of each pixel region PA can be covered by an intermediate insulating layer 140. The intermediate insulating layer 140 can be formed of a material that has etch selectivity relative to the sub-dike layer SB.

[0087] like Figure 9 As shown, the method for forming a display device according to an embodiment of the present disclosure may include the steps of forming a green reflective electrode 200G overlapping the green light-emitting regions G-EA of each pixel region on an intermediate insulating layer 140, and forming an upper planarization layer 150 covering the green reflective electrode 200G of each pixel region PA.

[0088] The upper planarization layer 150 may include regions overlapping with the red light-emitting region R-EA and the blue light-emitting region B-EA of each pixel region PA. For example, the upper planarization layer 150 may be formed on the entire surface of the device substrate 100 in which the green reflective electrode 200G of each pixel region PA is formed.

[0089] like Figure 10As shown, a method for forming a display device according to an embodiment of the present disclosure may include: forming a separating trench ST in a portion of an upper planarization layer 150 located between a red light-emitting region R-EA and a green light-emitting region G-EA in each pixel region PA; and forming an opening BH1 that exposes at least a portion of a sub-embankment layer SB that overlaps with a blue light-emitting region B-EA of each pixel region PA.

[0090] The opening BH1 may overlap with a portion of the upper planarization layer 150 disposed on the blue emitting region B-EA of each pixel region PA. The portion of the intermediate insulating layer 140 that overlaps with the blue emitting region B-EA of each pixel region PA can be removed during the process of forming the opening BH1. For example, the opening BH1 may penetrate a portion of the intermediate insulating layer 140 and the portion of the upper planarization layer 150 that overlaps with the blue emitting region B-EA of each pixel region PA.

[0091] like Figure 11 As shown, a method for forming a display device according to an embodiment of the present disclosure may include the step of forming a through hole BH2 in the portion of the sub-embankment layer SB exposed by the opening BH1.

[0092] The through-hole BH2 can be formed to a smaller size than the opening BH1. For example, the through-hole BH2 can be formed in the opening BH1. The opening BH1 and the through-hole BH2 can constitute the blue light-emitting limiting hole BDH.

[0093] like Figure 12 As shown, a method for forming a display device according to an embodiment of the present disclosure may include the step of forming a first electrode 310 overlapping with the light-emitting regions R-EA, G-EA and B-EA of each pixel region PA on a device substrate 100 in which a blue light-emitting limiting hole BDH is formed.

[0094] The first electrode 310 formed on the red light-emitting region R-EA of each pixel region PA and the first electrode 310 formed on the green light-emitting region G-EA of each pixel region PA can be in direct contact with the upper surface of the upper planarization layer 150 opposite to the device substrate 100. The first electrode 310 formed on the blue light-emitting region B-EA of each pixel region PA can be in direct contact with the blue reflective electrode 200B of the corresponding pixel region PA exposed by the blue light-emitting defining hole BDH. Therefore, in the method of forming the display device according to the embodiment of the present disclosure, a thickness difference caused by the blue light-emitting defining hole BDH can be formed between the red light-emitting region R-EA and the blue light-emitting region B-EA of each pixel region PA and between the green light-emitting region G-EA and the blue light-emitting region B-EA of each pixel region PA.

[0095] like Figure 13 As shown, a method for forming a display device according to an embodiment of the present disclosure may include the step of forming a partition 160 on a device substrate 100 in which a first electrode 310 of each pixel region PA is formed.

[0096] The partition 160 may partially expose the first electrode 310 formed on the red light-emitting area R-EA, the first electrode 310 formed on the green light-emitting area G-EA, and the first electrode 310 formed on the blue light-emitting area B-EA of each pixel area PA. For example, the edges of the first electrode 310 formed on the red light-emitting area R-EA, the edges of the first electrode 310 formed on the green light-emitting area G-EA, and the edges of the first electrode 310 formed on the red light-emitting area R-EA of each pixel area PA may be covered by the partition 160.

[0097] like Figure 14 As shown, a method for forming a display device according to an embodiment of the present disclosure may include the step of forming a light-emitting unit 320 on a device substrate 100 in which a partition wall 160 is formed.

[0098] The steps of forming the light-emitting unit 320 may include forming a first light-emitting stack 321, forming a charge-generating layer 322 on the first light-emitting stack 321, and forming a second light-emitting stack 323 on the charge-generating layer 322. The first light-emitting stack 321 and the charge-generating layer 322 can be separated by a separating trench ST between the red light-emitting region R-EA and the green light-emitting region G-EA of each pixel region. The first light-emitting stack 321 and the charge-generating layer 322 can be separated by blue light-emitting defining apertures BDH between the red light-emitting region R-EA and the blue light-emitting region B-EA of each pixel region PA, and between the green light-emitting region G-EA and the blue light-emitting region B-EA of each pixel region PA. That is, in the method of forming a display device according to an embodiment of the present disclosure, the charge-generating layer 322 on the red light-emitting region R-EA of each pixel region PA, the charge-generating layer 322 on the green light-emitting region G-EA of each pixel region PA, and the charge-generating layer 322 on the blue light-emitting region B-EA of each pixel region PA can be separated from each other without additional processing. Therefore, in the method of forming a display device according to the embodiments of the present disclosure, process efficiency can be improved.

[0099] The second light-emitting stack 323 on the green light-emitting region G-EA of each pixel region PA can be connected to the second light-emitting stack 323 on the red light-emitting region R-EA of the corresponding pixel region PA. For example, an air gap can be formed in the separating trench ST. The second light-emitting stack 323 on the blue light-emitting region B-EA of each pixel region PA can be in direct contact with the second light-emitting stack 323 on the red light-emitting region R-EA of the corresponding pixel region PA and the second light-emitting stack 323 on the green light-emitting region G-EA of the corresponding pixel region PA.

[0100] like Figure 4 As shown, the method for forming a display device according to an embodiment of the present disclosure may include the steps of forming a second electrode 330 on a light-emitting unit 320 to form a light-emitting device 300; forming an encapsulation structure 400 on the light-emitting device 300; forming color filters 500R, 500G and 500B on the encapsulation structure 400; and forming an optical insulating layer 600 on the color filters 500R, 500G and 500B.

[0101] Therefore, in the method of forming a display device according to an embodiment of the present disclosure, the charge generation layer 322 can be separated by a separating trench ST formed in the portion of the upper planarization layer 150 between the red light-emitting regions R-EA and the green light-emitting regions G-EA of each pixel region PA, and an opening BH1 formed in the portion of the upper planarization layer 150 overlapping with the blue light-emitting regions B-EA of each pixel region PA. Therefore, in the method of forming a display device according to an embodiment of the present disclosure, the process for preventing or reducing leakage current through the charge generation layer 322 in the first direction X and the second direction Y can be simplified. Therefore, in the method of forming a display device according to an embodiment of the present disclosure, production energy can be reduced through process optimization.

[0102] The display device according to an embodiment of the present disclosure describes a driving circuit DC for each sub-pixel SP consisting 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 for each sub-pixel SP may include a driving thin-film transistor and a plurality of switching thin-film transistors. For example, in another embodiment of the display device according to the present disclosure, the driving circuit DC for 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 gating signal. Therefore, in another embodiment of the display device according to the present disclosure, the degree of freedom in the configuration of each driving circuit DC can be increased.

[0103] The display device according to an embodiment of the present disclosure is described as having a device substrate 100 made of a wafer 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 include 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.

[0104] A display device according to an embodiment of the present disclosure is described, wherein a first light-emitting stack 321 includes a blue light-emitting material layer 321be, and a second light-emitting stack 323 includes a red light-emitting material layer 323re and a green light-emitting material layer 323ge. However, in a display device according to another embodiment of the present disclosure, the light-emitting unit 320 may include a plurality of charge-generating layers 322. For example, in a display device according to another embodiment of the present disclosure, the light-emitting unit 320 may include 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, such as... Figure 15 and Figure 16 As shown. The first light-emitting stack 321 may include a blue light-emitting material layer 321be, the second light-emitting stack 323 may include a red light-emitting material layer 323re, and the third light-emitting stack 325 may include a green light-emitting material layer 325ge. The second charge-generating layer 324 may not be separated by the separating trench ST and the thickness difference caused by the opening BH1. Therefore, in a display device according to another embodiment of the present disclosure, the degree of freedom in the arrangement of the light-emitting units 320 can be increased.

[0105] A display device according to an embodiment of the present disclosure is described, wherein each of color filters 500R, 500G, and 500B is disposed on one of the light-emitting regions R-EA, G-EA, and B-EA. However, in a display device according to another embodiment of the present disclosure, at least one of the color filters 500R, 500G, and 500B may be omitted. For example, in a display device according to another embodiment of the present disclosure, such as Figure 17 As shown, the optical insulating layer 600 can directly contact the upper surface of the package structure 400 opposite to the device substrate 100 on the blue emitting regions B-EA of each pixel region PA. That is, in a display device according to another embodiment of the present disclosure, the step of forming the blue filter 500B can be omitted. Therefore, in a display device according to another embodiment of the present disclosure, process efficiency can be improved.

[0106] A display device according to an embodiment of the present disclosure is described, in which the blue emitting region B-EA of each pixel region PA is driven individually. However, in a display device according to another embodiment of the present disclosure, at least one of the emitting regions R-EA, G-EA, and B-EA in each pixel region PA can be controlled independently. For example, in a display device according to another embodiment of the present disclosure, a dividing trench ST can be provided between the blue emitting region B-EA and the green-blue emitting region G-EA of each pixel region PA, and a thickness difference caused by the opening BH1 can be formed between the blue emitting region B-EA and the red emitting region R-EA of each pixel region PA and between the green emitting region G-EA and the red emitting region R-EA of each pixel region PA. Therefore, in a display device according to another embodiment of the present disclosure, the charge generation layer 322 on the red emitting region R-EA of each pixel region PA can be electrically connected to the charge generation layer 322 on the red emitting region R-EA of adjacent pixel regions PA in the first direction X. That is, in a display device according to another embodiment of the present disclosure, the red light emitted from the red emitting region R-EA of each pixel region PA can be controlled independently. Therefore, in a display device according to another embodiment of the present disclosure, the degree of freedom in the configuration of each pixel region PA can be increased, and the overall lifespan can be improved.

[0107] A display device according to an embodiment of the present disclosure is described, wherein a first pad region PADm and a second pad region PADs are disposed on a border region BZ. However, in a display device according to another embodiment of the present disclosure, a single pad region PAD may be disposed on the border region BZ. For example, in a display device according to another embodiment of the present disclosure, a second common wiring CL2 may be electrically connected to the pad region PAD in the same way as the first common wiring CL1, such as... Figure 18 As shown. Therefore, in a display device according to another embodiment of the present disclosure, the area of ​​the border region BZ can be reduced.

[0108] A display device according to another embodiment of the present disclosure may include a display panel DP used in various electronic devices. For example, a display device according to another embodiment of the present disclosure may be a head-mounted display (HMD) device, wherein the display panel DP is housed in an image element 910, and the image element 910 is fixed in front of the user's eyes by a mounting element 920, such as... Figure 19 and Figure 20As shown. 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 direction from the edge of the image element 910. The mounting element 920 may be coupled to the image element 910 via a connecting element 930. For example, the connecting element 930 may be plate-shaped, including a region coupled to the image element 910 and a region coupled to the mounting element 920. The connecting element 930 may be disposed inside the image element 910 and the mounting element 920.

[0109] An eyepiece 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 gap may be provided between the display panel DP and the eyepiece OL. For example, the display panel DP may be disposed close to a first surface of the image element 910, and the left-eye lens LL and 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 connecting element 930 to maintain the space between the display panel DP and the eyepiece OL. The gap-maintaining element 940 may be disposed parallel to the connecting element 930. For example, the gap-maintaining element 940 may be in direct contact with the connecting element 930.

[0110] A first fixing element 951 for fixing the display panel DO can be disposed 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 OL due to user movement can be effectively prevented or reduced. 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.

[0111] In a display device according to another embodiment of the present disclosure, an image on 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. For example, at least one optical lens 960 can be disposed between the display panel DP and the eyepiece OL. The at least one optical lens 960 can be spaced apart from the display panel DP and the eyepiece OL. For example, a second fixing element 952 for fixing at least one optical lens 960 can be disposed in the image element 910. The image on the display panel DP can be displayed on the actual object disposed in front of the user through at least one optical lens 960. Therefore, in a display device according to another embodiment of the present disclosure, accidents caused by obstructing the user's view can be prevented or reduced.

[0112] A display device according to another embodiment of the present disclosure is described, wherein the mounting element 920 has a shape such as the temple of an eyeglass frame. However, in the display device according to another embodiment of the present disclosure, the mounting element 920 can have various shapes. For example, in the display device according to another embodiment of the present disclosure, the mounting element 920 can have a headgear shape surrounding the user's head. Therefore, in the display device according to another embodiment of the present disclosure, the degree of freedom in the type of electronic device in which the display panel DP is used can be increased.

[0113] As a result, the display device according to the embodiments of the present disclosure may include a planarization layer, light-emitting devices, and spacers on a device substrate. The light-emitting devices may be disposed on a first light-emitting region, a second light-emitting region, and a third light-emitting region in each pixel region defined by the spacers. Each light-emitting device may include a charge-generating layer between a first light-emitting stack and a second light-emitting stack. The planarization layer may include a separating trench disposed between the first and second light-emitting regions in each pixel region and an opening overlapping the third light-emitting region in each pixel region. Therefore, in the display device according to the embodiments of the present disclosure, the charge-generating layer in each light-emitting region can be separated by the separating trench and the thickness difference caused by the opening. Therefore, in the display device according to the embodiments of the present disclosure, current leakage caused by the charge-generating layer can be prevented or reduced. Furthermore, in the display device according to the embodiments of the present disclosure, production energy can be reduced through process optimization.

[0114] Cross-reference to related applications

[0115] This application claims the benefit of Korean Patent Application No. 10-2025-0010395, filed on January 23, 2025, which is incorporated herein by reference as if fully set forth herein.

Claims

1. A display device, the display device comprising: A partition wall is located on the device substrate of the display device, and the partition wall defines a first light-emitting area, a second light-emitting area, and a third light-emitting area in each pixel region of the display device; A light-emitting device, wherein the light-emitting device is on the device substrate, and the light-emitting device overlaps with the first light-emitting region, the second light-emitting region and the third light-emitting region of each pixel region; as well as A planarization layer is provided between the device substrate and the partition wall. The planarization layer includes a separating trench and an opening. The separating trench is disposed between the first light-emitting region and the second light-emitting region of each pixel region, and the opening overlaps with the third light-emitting region of each pixel region. Each of the light-emitting devices includes a first light-emitting layer, a first charge-generating layer, and a second light-emitting layer stacked sequentially. Wherein, the separating trench separates the first charge-generating layer between the first light-emitting region and the second light-emitting region in each pixel region, and Wherein, between the first light-emitting region and the third light-emitting region in each pixel region and between the second light-emitting region and the third light-emitting region in each pixel region, the first charge-generating layer is separated by a thickness difference caused by the opening.

2. The display device according to claim 1, wherein, The light generated by the second light-emitting layer displays a different color than the light generated by the first light-emitting layer, and In each pixel region, the first light-emitting region, the second light-emitting region, and the third light-emitting region are different colors.

3. The display device according to claim 1, wherein, The second light-emitting area of ​​each pixel region is arranged side by side with the first light-emitting area of ​​the corresponding pixel region in a first direction, and In this configuration, the third light-emitting region of each pixel region is arranged side by side with the first light-emitting region and the second light-emitting region of the corresponding pixel region in a second direction perpendicular to the first direction.

4. The display device according to claim 3, wherein, The dividing groove extends along the second direction, and The length of the dividing groove in the second direction is longer than the length of the first light-emitting area of ​​each pixel region in the second direction, and also longer than the length of the second light-emitting area of ​​each pixel region in the second direction.

5. The display device according to claim 3, wherein, The length of each of the first and second light-emitting regions in each pixel region in the second direction is greater than its length in the first direction, and In each of the pixel regions, the length of the third light-emitting region in the second direction is shorter than its length in the first direction.

6. The display device according to claim 5, wherein, The first charge generating layer in the third light-emitting region of each pixel region is in contact with the first charge generating layer in the third light-emitting region of the adjacent pixel region in the first direction.

7. The display device according to claim 6, further comprising a pad area on the device substrate. in, The device substrate includes a display area having the pixel area and a border area outside the display area. The first charge generation layer is electrically connected to the pad area on the border area.

8. The display device according to claim 1, further comprising: A first reflective electrode is located between the device substrate and the light-emitting device, and the first reflective electrode overlaps with the first light-emitting region of each pixel region; A second reflective electrode is located between the device substrate and the light-emitting device, and the second reflective electrode overlaps with the second light-emitting region of each pixel region. as well as A third reflective electrode is located between the device substrate and the light-emitting device, and the third reflective electrode overlaps with the third light-emitting region of each pixel region. The second reflective electrode is disposed on a different layer than the first and third reflective electrodes, and The third reflective electrode is disposed on the same layer as the first reflective electrode.

9. The display device according to claim 8, further comprising a sub-embankment layer between the device substrate and the planarization layer, the sub-embankment layer overlapping the third light-emitting region of each pixel region. in, The sub-embankment layer includes through holes, which overlap with at least a portion of the third reflective electrode, and The edge of the third reflective electrode is covered by the sub-embankment layer.

10. The display device according to claim 8, wherein, The light-emitting device includes a first light-emitting device overlapping with the first light-emitting region of each pixel region, a second light-emitting device overlapping with the second light-emitting region of each pixel region, and a third light-emitting device overlapping with the third light-emitting region of each pixel region. The distance between the third reflective electrode and the third light-emitting device is different from the distance between the first reflective electrode and the first light-emitting device.

11. The display device according to claim 10, wherein, The distance between the device substrate and the second light-emitting device is the same as the distance between the device substrate and the first light-emitting device, and The distance between the device substrate and the third light-emitting device is different from the distance between the device substrate and the second light-emitting device.

12. The display device according to claim 10, wherein, Each of the light-emitting devices includes a first electrode disposed between the device substrate and the first light-emitting stack, and a second electrode disposed on the second light-emitting stack. The first electrode of the second light-emitting device comprises the same material as the first electrode of the first light-emitting device. Wherein, the first electrode of the third light-emitting device comprises the same material as the first electrode of the second light-emitting device, and Wherein, the distance between the device substrate and the second electrode of the third light-emitting device is less than the distance between the device substrate and the second electrode of the first light-emitting device and less than the distance between the device substrate and the second electrode of the second light-emitting device.

13. The display device according to claim 12, wherein, The first electrode of the third light-emitting device is in contact with the third reflective electrode.

14. The display device according to claim 1, wherein, Each of the light-emitting devices further includes a second charge-generating layer on the second light-emitting region and a third light-emitting stack on the second charge-generating layer. Wherein, the second charge generation layer on the second light-emitting area of ​​each pixel region is in contact with the second charge generation layer on the first light-emitting area of ​​the corresponding pixel region, and In each pixel region, the second charge generation layer on the third light-emitting region is in contact with the second charge generation layer on the first light-emitting region of the corresponding pixel region and the second charge generation layer on the second light-emitting region of the corresponding pixel region.

15. The display device according to claim 14, wherein, The first light-emitting stack is configured to produce light having a first color. The second light-emitting layer is configured to generate light of a second color. The third light-emitting layer is configured to produce light of a third color, and The third color is different from the first color and the second color.

16. The display device according to claim 1, further comprising: A packaging structure on the light-emitting device; A first color filter is located on the encapsulation structure and overlaps with the first light-emitting region of each pixel region. A second color filter is located on the encapsulation structure and overlaps with the second light-emitting region of each pixel region. as well as An optical insulating layer is provided on both the first and second color filters. The light passing through the second color filter displays a different color than the light passing through the first color filter, and In each of the pixel regions, the optical insulating layer on the third light-emitting region is in contact with the upper surface of the packaging structure, and the upper surface of the packaging structure is opposite to the lower surface facing the device substrate.

17. The display device according to claim 1, wherein, The third light-emitting region of each pixel region is a blue light-emitting region that achieves blue light.

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