Organic light emitting display device

Abstract

Disclosed is an organic light emitting display device that prevents lateral current leakage by providing a structure on a bank to cut off organic material formed around the structure in a subsequent process.

Description

[0001] This application is a divisional application of the original invention patent application No. 201711477800.2 (filed on December 29, 2017, invention title: organic light-emitting display device). Technical Field

[0002] The present invention relates to organic light-emitting display devices, and more specifically, to an organic light-emitting display device having a structure for cutting organic materials on a dam. Background Technology

[0003] Recently, with the full arrival of the information age, the field of displays that visually display electrically transmitted information signals has developed rapidly. In response, various flat panel display devices with excellent characteristics (such as small thickness, light weight and low power consumption) have been developed and have rapidly replaced existing cathode ray tubes (CRTs).

[0004] Representative examples of such flat panel display devices may include liquid crystal display (LCD) devices, plasma display panel (PDP) devices, field emission display (FED) devices, and organic light-emitting display (OLED) devices.

[0005] Among these, organic light-emitting display devices are considered a competitive application because they do not require a separate light source and enable compact device designs and vivid color displays.

[0006] Organic light-emitting display devices include organic light-emitting elements that are driven independently on a per-subpixel basis. Such organic light-emitting elements include an anode, a cathode, and multiple organic layers located between the anode and the cathode.

[0007] The organic layer comprises, sequentially arranged from the anode, a hole injection layer, a hole transport layer, an organic light-emitting layer, and an electron transport layer. Among these layers, the organic light-emitting layer primarily emits light as the energy of excitons generated via recombination of holes and electrons decreases to the ground state. The other layers assist in transporting holes or electrons to the organic light-emitting layer.

[0008] Furthermore, in organic light-emitting display devices, to achieve color display, subpixels are divided into red, green, and blue subpixels, and an organic light-emitting layer with the corresponding color of the subpixel is formed on each subpixel. Typically, shadow mask deposition is used to form the organic light-emitting layer.

[0009] However, when the shadow mask has a large area, it may sag due to its weight, which could lead to a decrease in yield after repeated use. Therefore, in the absence of a shadow mask, other organic layers besides the light-emitting layer are formed continuously in each sub-pixel.

[0010] However, because current can flow laterally through the common layer of the resulting sub-pixels that are continuously formed in a plane, lateral current leakage may occur.

[0011] Figure 1 This is a cross-sectional view illustrating the lateral current leakage phenomenon in a conventional organic light-emitting display device. Consider one form of conventional organic light-emitting display device, such as... Figure 1 As illustrated, in each sub-pixel on the substrate 10, a first electrode 11, a dam 12 superimposed on the edge of the first electrode 11 and defining an emission portion, and a hole injection layer 13 and a hole transport layer 14 covering the first electrode 11 and the dam 12 are sequentially formed. In addition, light-emitting layers 16 and 17, an electron transport layer 18, and a second electrode 19 are sequentially formed above the hole transport layer 14.

[0012] Furthermore, in the red sub-pixel where the light-emitting region located between the first electrode 11 and the second electrode 19 is formed to be higher than the light-emitting regions of other sub-pixels according to the resonance condition, an auxiliary hole transport layer 15 can be further disposed between the hole transport layer 14 and the red light-emitting layer 16 to match this light-emitting height. The position of the light-emitting layer obtaining the maximum wavelength can be set differently between the first electrode 11 and the second electrode 19 for various colors of light. The red light-emitting layer can be located at the highest height, the green light-emitting layer at the second highest height, and the blue light-emitting layer at the lowest height. Therefore, the green sub-pixel can also include an auxiliary hole transport layer located between the hole transport layer and the green light-emitting layer, and the auxiliary hole transport layer disposed in the green sub-pixel can be thinner than the auxiliary hole transport layer 15 disposed in the red sub-pixel.

[0013] However, as Figure 1 As illustrated, in a conventional organic light-emitting display device, during low-grayscale blue illumination, adjacent red sub-pixels are also turned on. This is caused by the phenomenon that, although a voltage is applied between the first and second electrodes of only the blue sub-pixel in order to emit pure blue light, when the light is turned on, the current flowing through the vertical electric field between the first electrode (anode) and the second electrode (cathode) of the blue sub-pixel leaks laterally through the common layer, thus turning on the adjacent sub-pixels.

[0014] In particular, lateral current leakage is clearly visible in low grayscale displays. This is because when the current flowing horizontally in the blue subpixel flows laterally towards the common organic layer, the adjacent red subpixel, which is in a cutoff state, behaves as if it were turned on. In this case, color purity may degrade, and displaying pure blue grayscale becomes difficult.

[0015] This is because the driving voltage required for red lighting is lower than that required for blue lighting, and therefore, even a small amount of leakage current can result in a similar lighting effect.

[0016] In particular, this additional color illumination caused by lateral current leakage may result in color mixing in low grayscale displays, which may hinder the proper display of the desired colors.

[0017] Furthermore, when the hole mobility of the common organic layer increases, lateral current leakage may have a greater impact on adjacent sub-pixels. Summary of the Invention

[0018] The embodiment relates to an organic light-emitting display device, which includes a substrate, a first electrode, a dam, a first spacer, an organic stack, and a second electrode. The substrate includes a plurality of pixels. Each pixel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel. Each of the first to third sub-pixels has an emitting portion and a non-emitting portion surrounding the emitting portion. The first electrode is located on the emitting portion of each of the first to third sub-pixels. The dam is located on the non-emitting portion. The first spacer has an inverted conical shape and is disposed on the dam at least between the first sub-pixel and the second sub-pixel. The organic stack is located above the first electrode and the first spacer. The organic stack located on the first electrode is spaced apart from the side of the first electrode. The second electrode is disposed on the organic stack. The length of the first spacer in a first direction is shorter than the dimension of the first sub-pixel in the first direction. The second and third sub-pixels are separated from the first sub-pixel in a second direction intersecting the first direction.

[0019] In one or more embodiments, the length of the first spacer is greater than the size of the emitting portion of the second sub-pixel.

[0020] In one or more embodiments, the second sub-pixel and the third sub-pixel are arranged alternately in a first direction. The first spacer extends between the first sub-pixel and the third sub-pixel.

[0021] In one or more embodiments, the first sub-pixel extends at least in the first direction to the edge of the third sub-pixel. The edge is located on the side of the third sub-pixel away from the second sub-pixel.

[0022] In one or more embodiments, the first spacer includes a first segment located between the first sub-pixel and the second sub-pixel, and a second segment located between the second sub-pixel and the third sub-pixel. The first segment and the second segment are directly connected.

[0023] In one or more embodiments, the first spacer includes a first segment located between the first sub-pixel and the second sub-pixel, and a second segment located between the first sub-pixel and the third sub-pixel. The first segment and the second segment are separated in the first direction.

[0024] In one or more embodiments, the second segment is longer than the size of the second sub-pixel in the second direction or the size of the third sub-pixel in the second direction.

[0025] In one or more embodiments, the first spacer has a width ranging from 1 μm to 5 μm in the second direction.

[0026] In one or more embodiments, the threshold voltage of the first sub-pixel is higher than the threshold voltage of the second sub-pixel.

[0027] In one or more embodiments, the threshold voltage of the first sub-pixel is higher than the threshold voltage of the second sub-pixel.

[0028] In one or more embodiments, the organic light-emitting display device includes a second spacer disposed between the second sub-pixel and the third sub-pixel. The second sub-pixel and the third sub-pixel are smaller than the first sub-pixel.

[0029] In one or more embodiments, the second spacer is higher than the first spacer.

[0030] In one or more embodiments, the organic stack includes a hole injection layer contacting the first electrode and at least one stack. The at least one stack includes a sequential stack of a hole transport layer, a light-emitting layer, and an electron transport layer.

[0031] In one or more embodiments, the organic stack comprises a plurality of stacks. Each of the plurality of stacks comprises a hole transport layer, a light-emitting layer, and an electron transport layer in sequence, and the organic light-emitting display device further comprises a charge-generating layer located between the plurality of stacks.

[0032] In one or more embodiments, at least one layer of the organic stack has a gap at the side of the first spacer.

[0033] In one or more embodiments, at least one layer of the organic stack located on the first spacer has an island shape.

[0034] In one or more embodiments, at least one layer of the organic stack located on the first spacer has an island shape.

[0035] In one or more embodiments, the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

[0036] The embodiment also relates to an organic light-emitting device including a first sub-pixel, a second sub-pixel, and a spacer. The first sub-pixel in the pixel emits light of a first color. The first sub-pixel includes two first electrodes and a first portion of an organic stack sandwiched between the two first electrodes. The second sub-pixel is adjacent to and spaced apart from the first sub-pixel in the pixel. The second sub-pixel emits light of a second color. The second sub-pixel includes two electrodes and a first portion of an organic stack sandwiched between the two electrodes. The spacer is located between the first sub-pixel and the second sub-pixel. The spacer separates the first portion and the second portion of the organic stack. The length of the spacer in a first direction is shorter than the dimension of the first sub-pixel in the first direction. The second sub-pixel is separated from the first sub-pixel in a second direction intersecting the first direction.

[0037] Appendix 1. An organic light-emitting display device, the organic light-emitting display device comprising:

[0038] A substrate comprising a plurality of pixels, the plurality of pixels including a first sub-pixel, a second sub-pixel and a third sub-pixel, each of the first sub-pixel to the third sub-pixel having an emitting portion and a non-emitting portion surrounding the emitting portion;

[0039] A first electrode is located on the emitting portion of each of the first to third sub-pixels;

[0040] A dam, located on the non-emission portion;

[0041] A first spacer, the first spacer being at least on the embankment between the emitting portion of the first sub-pixel and the emitting portion of the second sub-pixel;

[0042] An organic stack is located above the first electrode and the first spacer, wherein the organic stack has at least two layers and a charge generation layer between the layers, and wherein a first color emitting layer at the first sub-pixel, a second color emitting layer at the second sub-pixel, and a third color emitting layer at the third sub-pixel are disposed in each layer; and

[0043] The second electrode is located on the organic stack.

[0044] Note 2. The organic light-emitting display device according to Note 1 further includes a capping layer on the second electrode.

[0045] Note 3. The organic light-emitting display device according to Note 1, wherein the first spacer has an inverted conical shape.

[0046] Note 4. The organic light-emitting display device according to Note 2, wherein at least one of the organic stack, the second electrode and the capping layer has a break portion on at least one side of the first spacer.

[0047] Note 5. The organic light-emitting display device according to Note 2, wherein at least one of the organic stack, the second electrode and the capping layer has an island shape.

[0048] Note 6. In the organic light-emitting display device according to Note 1, wherein, among the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer, the first color light-emitting layer has the thinnest first thickness and the second color light-emitting layer has the thickest second thickness.

[0049] Note 7. In the organic light-emitting display device according to Note 1, the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer have the same body and the same dopant at vertically different stacked positions at the first sub-pixel, the second sub-pixel and the third sub-pixel, respectively.

[0050] Appendix 8. The organic light-emitting display device according to Appendix 1, wherein the at least two stacked layers include a hole transport layer located below the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer, and an electron transport layer located on the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer.

[0051] Note 9. The organic light-emitting display device according to Note 1, wherein the charge generation layer includes a p-type charge generation layer and an n-type charge generation layer.

[0052] Note 10. The organic light-emitting display device according to Note 1, wherein the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

[0053] Note 11. The organic light-emitting display device according to Note 1 further includes a second spacer disposed between the second sub-pixel and the third sub-pixel.

[0054] Note 12. The organic light-emitting display device according to Note 11, wherein at least one of the second sub-pixel and the third sub-pixel is smaller than the first sub-pixel in a first direction.

[0055] Note 13. The organic light-emitting display device according to Note 11, wherein the second spacer is higher than the first spacer.

[0056] Note 14. The organic light-emitting display device according to Note 1, wherein the length of the first spacer in a first direction is shorter than the length of the emitting portion of the first sub-pixel in the first direction and longer than the length of the emitting portion of the second sub-pixel in the first direction.

[0057] Note 15. The organic light-emitting display device according to Note 14, wherein the second sub-pixel and the third sub-pixel are separated from the first sub-pixel in a second direction intersecting the first direction, and wherein the second sub-pixel and the third sub-pixel are arranged alternately in the first direction.

[0058] Note 16. The organic light-emitting display device according to Note 14, wherein the first spacer extends between the first sub-pixel and the third sub-pixel.

[0059] Note 17. The organic light-emitting display device according to Note 14, wherein the first sub-pixel extends at least to the edge of the third sub-pixel in the first direction, the edge being located on the side of the third sub-pixel away from the second sub-pixel.

[0060] Note 18. The organic light-emitting display device according to Note 1, wherein the first spacer includes a first segment located between the first sub-pixel and the second sub-pixel and a second segment located between the second sub-pixel and the third sub-pixel, wherein the first segment and the second segment are directly connected.

[0061] Note 19. The organic light-emitting display device according to Note 1, wherein the first spacer includes a first segment located between the first sub-pixel and the second sub-pixel and a second segment located between the first sub-pixel and the third sub-pixel, and the first segment and the second segment are separated in a first direction.

[0062] Note 20. The organic light-emitting display device according to Note 19, wherein, in a second direction intersecting the first direction, the second segment is longer than the size of the second sub-pixel or the size of the third sub-pixel.

[0063] Note 21. The organic light-emitting display device according to Note 20, wherein the first spacer has a width ranging from 1 μm to 5 μm in the second direction.

[0064] Note 22. The organic light-emitting display device according to Note 1, wherein the threshold voltage of the first sub-pixel is the highest among the first sub-pixel to the third sub-pixel.

[0065] Note 23. The organic light-emitting display device according to Note 2, wherein the total thickness of the organic stack, the second electrode and the capping layer is less than the thickness of the dam or the first spacer.

[0066] Appendix 24. An organic light-emitting display device, comprising:

[0067] A substrate comprising multiple pixels, the multiple pixels including a first sub-pixel, a second sub-pixel and a third sub-pixel, at least one of the first sub-pixel to the third sub-pixel having an emitting portion and a non-emitting portion;

[0068] The first electrode corresponding to the first sub-pixel to the third sub-pixel;

[0069] The dam on the first electrode;

[0070] At least a first spacer on the embankment between the first sub-pixel and the second sub-pixel;

[0071] An organic stack disposed on the first electrode and the first spacer, the organic stack comprising at least two layers and at least one charge-generating layer between the layers, and the organic stack comprising at least two identical color-emitting layers at the first sub-pixel, at least two identical color-emitting layers at the second sub-pixel, and at least two identical color-emitting layers at the third sub-pixel, wherein each of the at least two identical color-emitting layers at each of the first to the third sub-pixels comprises a first color-emitting layer, a second color-emitting layer, and a third color-emitting layer; and

[0072] The second electrode on the organic stack.

[0073] Note 25. The organic light-emitting display device according to Note 24 further includes a capping layer on the second electrode.

[0074] Note 26. The organic light-emitting display device according to Note 24, wherein the first spacer has an inverted conical shape.

[0075] Note 27. The organic light-emitting display device according to Note 25, wherein at least one of the organic stack, the second electrode and the capping layer has a break portion on at least one side of the first spacer.

[0076] Note 28. The organic light-emitting display device according to Note 25, wherein at least one of the organic stack, the second electrode and the capping layer has an island shape.

[0077] Note 29. In the organic light-emitting display device according to Note 24, the first color light-emitting layer, the second color light-emitting layer, and the third color light-emitting layer have the thinnest first thickness and the second color light-emitting layer have the thickest second thickness.

[0078] Note 30. In the organic light-emitting display device according to Note 24, the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer have the same body and the same dopant at vertically different stacked positions at the first sub-pixel, the second sub-pixel and the third sub-pixel, respectively.

[0079] Note 31. The organic light-emitting display device according to Note 24, wherein the at least two stacked layers further include a hole transport layer located below the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer, and an electron transport layer located above the first color light-emitting layer, the second color light-emitting layer and the third color light-emitting layer.

[0080] Note 32. The organic light-emitting display device according to Note 24, wherein the charge generation layer comprises a p-type charge generation layer and an n-type charge generation layer.

[0081] Note 33. The organic light-emitting display device according to Note 24, wherein the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

[0082] Note 34. The organic light-emitting display device according to Note 24 further includes a second spacer disposed between the second sub-pixel and the third sub-pixel.

[0083] Note 35. The organic light-emitting display device according to Note 34, wherein the second spacer is different from the first spacer.

[0084] Note 36. The organic light-emitting display device according to Note 34, wherein the second spacer is higher than the first spacer.

[0085] Note 37. The organic light-emitting display device according to Note 35, wherein at least one of the second sub-pixel and the third sub-pixel is smaller than the first sub-pixel in a first direction.

[0086] Note 38. The organic light-emitting display device according to Note 35, wherein the length of the first spacer in a first direction is shorter than the length of the emitting portion of the first sub-pixel in the first direction and longer than the length of the emitting portion of the second sub-pixel in the first direction.

[0087] Note 39. The organic light-emitting display device according to Note 38, wherein the second sub-pixel and the third sub-pixel are separated from the first sub-pixel in a second direction intersecting the first direction, and wherein the second sub-pixel and the third sub-pixel are arranged alternately in the first direction.

[0088] Note 40. The organic light-emitting display device according to Note 39, wherein the first spacer extends between the first sub-pixel and the third sub-pixel.

[0089] Note 41. The organic light-emitting display device according to Note 40, wherein the first sub-pixel extends at least to the edge of the third sub-pixel in the first direction, the edge being located on the side of the third sub-pixel away from the second sub-pixel.

[0090] Note 42. The organic light-emitting display device according to Note 24, wherein the first spacer includes a first segment located between the first sub-pixel and the second sub-pixel and a second segment located between the second sub-pixel and the third sub-pixel, wherein the first segment and the second segment are directly connected.

[0091] Note 43. The organic light-emitting display device according to Note 24, wherein the first spacer includes a first segment located between the first sub-pixel and the second sub-pixel and a second segment located between the first sub-pixel and the third sub-pixel, wherein the first segment and the second segment are separated in a first direction.

[0092] Note 44. The organic light-emitting display device according to Note 43, wherein, in a second direction intersecting the first direction, the second segment is longer than the size of the second sub-pixel or the size of the third sub-pixel.

[0093] Note 45. The organic light-emitting display device according to Note 44, wherein the first spacer has a width in the range of 1 μm to 5 μm in the second direction.

[0094] Note 46. The organic light-emitting display device according to Note 24, wherein, among the first sub-pixel to the third sub-pixel, the first sub-pixel has the highest threshold voltage.

[0095] Note 47. The organic light-emitting display device according to Note 25, wherein the total thickness of the organic stack, the second electrode and the capping layer is less than the thickness of the dam or the first spacer. Attached Figure Description

[0096] The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the invention and, together with this specification, serve to explain the principles of the invention. In the drawings:

[0097] Figure 1 This is a cross-sectional view illustrating the lateral leakage phenomenon in a conventional organic light-emitting display panel.

[0098] Figure 2 This is a plan view illustrating an organic light-emitting display device according to a first embodiment of the present invention.

[0099] Figure 3 This illustrates the region along which the thin-film transistors, each containing a sub-pixel, are formed. Figure 2 The cross-sectional view taken from line I-I'.

[0100] Figure 4 It is along Figure 2 The cross-sectional view taken from line II-II'.

[0101] Figure 5 This is a plan view illustrating an organic light-emitting display device according to a second embodiment of the present invention.

[0102] Figure 6 This is a plan view illustrating an organic light-emitting display device according to a third embodiment of the present invention.

[0103] Figure 7 This is a plan view illustrating an organic light-emitting display device according to a fourth embodiment of the present invention.

[0104] Figure 8 This is a plan view illustrating an organic light-emitting display device according to a comparative example.

[0105] Figure 9 These are micrographs illustrating the situation where the blue sub-pixels of the comparative example and the first to third embodiments of the present invention are turned on, captured by an optical microscope.

[0106] Figure 10 These are photographs illustrating a screen when the blue sub-pixel is turned on, according to a comparative example and the first to third embodiments of the present invention.

[0107] Figure 11This is a graph illustrating the normalized EL intensity of each wavelength when the blue sub-pixel is turned on, according to the comparative example and the first to third embodiments of the present invention.

[0108] Figure 12 This is a view illustrating the change in color coordinates between low and high grayscale when the blue sub-pixel is turned on, according to a comparative example and a first embodiment of the present invention.

[0109] Figure 13 This is an example of a graph showing the relative resistance based on the comparative example and the first to third experimental examples.

[0110] Figure 14 The graph illustrates the sheet resistance curves based on the comparative example and the first to third experimental examples. Detailed Implementation

[0111] The advantages and features of the invention, and the ways in which they are obtained, will become apparent from the embodiments described in detail below with reference to the accompanying drawings. However, the invention is not limited to the embodiments disclosed below and may be embodied in many different forms. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope to those skilled in the art. The scope of the invention should be defined by the claims.

[0112] In the accompanying drawings illustrating exemplary embodiments of the invention, the illustrated shapes, sizes, ratios, angles, and quantities are given by way of example and are therefore not limited to the disclosure of the invention. Throughout this specification, the same reference numerals denote the same constituent elements. Furthermore, in the following description of the invention, detailed descriptions of known functions and constructions incorporated herein will be omitted where it might make the subject matter of the invention considerably unclear. The terms “comprising,” “including,” and / or “having” as used herein, unless used with the term “only,” do not exclude the presence or addition of other elements. Unless the context clearly indicates otherwise, the singular forms are intended to include the plural forms.

[0113] In the interpretation of the components included in the various embodiments of the invention, these components are interpreted as including a range of error, even if not explicitly described.

[0114] In the description of various embodiments of the present invention, when describing positional relationships, for example, when using terms such as "on," "above," "below," "beside," etc. to describe the positional relationship between two parts, one or more other parts may be located between the two parts unless the terms "direct" or "close" are used.

[0115] In the description of various embodiments of the present invention, when describing time relationships, for example, when using terms such as "after," "following," "next," "before," etc. to describe the time relationship between two actions, these actions may not occur sequentially unless "directly" or "immediately after" is used.

[0116] In the description of various embodiments of the present invention, although terms such as "first" and "second" may be used to describe various elements, these terms are only used to distinguish identical or similar elements from each other. Therefore, in this specification, unless otherwise mentioned, an element modified by "first" within the technical scope of the present invention may be the same as an element modified by "second".

[0117] Various features of the various embodiments of the present invention can be coupled to and combined with each other in part or in whole, and various technical linkages and their driving forces are possible. These various embodiments can be implemented independently of each other or can be implemented in conjunction with each other.

[0118] In this specification, a stack refers to a unit structure of organic layers including, for example, a hole transport layer and an electron transport layer, and an organic light-emitting layer interposed between the hole transport layer and the electron transport layer. The organic layer may also include a hole injection layer, an electron blocking layer, and other organic layers depending on the structure or design of the organic light-emitting element.

[0119] The implementation relates to providing an organic light-emitting display device in which transverse current leakage is prevented by cutting off the structure on the embankment of organic material.

[0120] *First Implementation Method*

[0121] Figure 2 This is a plan view illustrating an organic light-emitting display device according to a first embodiment of the present invention. Figure 3 This illustrates the region along which the thin-film transistors, each containing a sub-pixel, are formed. Figure 2 The cross-sectional view taken by line I-I', and Figure 4 It is along Figure 2 The cross-sectional view taken from line II-II'.

[0122] like Figure 2 , Figure 3 and Figure 4 As illustrated, the organic light-emitting display device according to a first embodiment of the present invention includes: a substrate 100 having a plurality of first sub-pixels Sub 1, second sub-pixels Sub 2, and third sub-pixels Sub 3, each sub-pixel having an emitting portion (in... Figure 2The emission portion is indicated by B-EML, G-EML, or R-EML and the non-emitting portion surrounding the emission portion; a first electrode 110 is disposed on the emission portion of each of the first sub-pixel Sub 1, the second sub-pixel Sub 2, and the third sub-pixel Sub 3; a dam 150 is disposed on the non-emitting portion; a first spacer 151 has an inverted (reverse) conical shape. The first spacer 151 is disposed on the dam 150 at least between the first sub-pixel Sub 1 and the second sub-pixel Sub 2, an organic stack 115 is disposed on the first electrode 110 and the first spacer 151 to have a gap at the side of the first spacer 151, and a second electrode 120 is disposed on the organic stack 115. The organic stack 115 on the first electrode 110 is spaced apart from the side of the first electrode 110.

[0123] In one or more embodiments, the threshold voltage of the first sub-pixel Sub 1 is higher than the threshold voltage of the second sub-pixel Sub 2. The threshold voltage of the third sub-pixel Sub 3 is lower than that of the first sub-pixel Sub 1. Due to its higher threshold voltage, leakage current from the first sub-pixel Sub 1 is likely to turn on the second or third sub-pixel even when these sub-pixels are not to be turned on.

[0124] In the following description, the first subpixel Sub 1 refers to the blue subpixel BSP with the largest area among the subpixels, the second subpixel Sub 2 refers to the red subpixel RSP, and the third subpixel Sub 3 refers to the green subpixel GSP. Furthermore, the first subpixel Sub 1, the second subpixel Sub 2, and the third subpixel Sub 3 are included within a single pixel P.

[0125] First, refer to Figure 2 Referring to the arrangement of sub-pixels, it can be done in the first direction ( Figure 2 The second sub-pixel Sub 2 and the third sub-pixel Sub 3 are alternately arranged in the vertical direction of the first direction, and can also be arranged in the second direction (which intersects the first direction). Figure 2 In the horizontal direction, a first sub-pixel Sub 1 is arranged to be adjacent to a pair including the second sub-pixel Sub 2 and the third sub-pixel Sub 3.

[0126] In the first direction, the length L of the first spacer 151 S It can be less than the length L of the emission portion B-EML of the first sub-pixel Sub 1. B And it can be greater than the length of the emission portion R-EML of the second sub-pixel Sub 2.

[0127] In addition, the width of the first spacer 151 in the direction intersecting the first direction can vary from 1 μm to 5 μm.

[0128] In the organic light-emitting display device of the present invention, why does the first spacer 151 have the aforementioned length L? S The reasons for the width are as follows.

[0129] like Figure 3 As shown, the organic stack 115 deposited after the first spacer 151 is formed has good flatness and therefore easily accumulates on the flat portions during deposition. However, when it encounters a structure where the size at the bottom is smaller than the size at the top (i.e., an inverted conical structure), it may not accumulate or may partially break off. Therefore, the organic stack 115 is cut off at the side of the inverted conical structure. Furthermore, the second electrode 120 disposed on the organic stack 115 is formed of metal and therefore has excellent coverage due to the random deposition of metal particles compared to organic particles, resulting in more diffuse reflection. However, when the second electrode 120 encounters the first spacer 151 with an inverted conical shape and the diameter difference between the top and bottom of the first spacer 151 increases (i.e., the angle between the side and the top of the first spacer 151 decreases), portions where the second electrode 120 is not deposited may appear. Therefore, by forming the first spacer 151 of the present invention with a width ranging from 1 μm to 5 μm and a length less than the length of the first sub-pixel Sub 1 having the maximum length, even if the second electrode 120 is spaced apart from the side of the first spacer 151 and has a hole of the same size as the first spacer 151, it is possible to prevent an increase in the sheet resistance of the second electrode 120 formed throughout the sub-pixel, which could occur in severe cases. That is, the width and length of the first spacer 151 are determined so that the organic stack 115 can be separated between the sub-pixels at the side of the first spacer 151 and to prevent an increase in the sheet resistance of the second electrode 120.

[0130] Furthermore, a second spacer 152 with a positive conical shape can be further provided on the embankment 150 between the second sub-pixel Sub 2 and the third sub-pixel Sub 3.

[0131] Here, the second height H2 of the second spacer 152 is greater than the first height H1 of the first spacer 151. Because the second spacer 152 is primarily used to support the fine metal mask used in subsequent processes of depositing organic materials (e.g., when a fine metal mask is used to selectively form an emissive layer for individual sub-pixels), and to prevent the fine metal mask from contacting the embankment 150 or the first spacer 151 below it when the fine metal mask sags due to its weight, the second spacer 152 is formed to be higher than the first spacer 151. The first height H1 of the first spacer 151 substantially ranges from 1 μm to 1.5 μm, and the second height H2 of the second spacer 152 substantially ranges from 1.7 μm to 2.5 μm.

[0132] Furthermore, the organic stack 115 can be a single-layer type comprising a hole injection layer HIL, a hole transport layer HTL, a light-emitting layer EML, and an electron transport layer ETL in contact with the first electrode 110, wherein the layers are stacked sequentially one after another. Alternatively, the organic stack 115 can be a tandem type comprising a hole injection layer HIL, multiple stacks (stack 1 and stack 2), and a charge generation layer CGL located between stack 1 and stack 2. The number of stacks used in the tandem structure can be two or more. In addition, the stacks used in the tandem structure can substantially include a hole transport layer, a light-emitting layer, and an electron transport layer, and may also include a hole control layer, an electron control layer, an electron blocking layer, and a hole blocking layer arranged close to the light-emitting layer. In addition, the charge generation layer CGL used in the tandem structure can include an n-type charge generation layer and a p-type charge generation layer stacked one after another.

[0133] As described above, because the hole injection layer HIL, which is formed to contact the first electrode 110, uses a highly conductive p-type dopant, this can become a major cause of lateral current leakage when adjacent sub-pixels are connected to each other. Furthermore, in structures comprising multiple stacked layers, because a higher density of dopant than that in the hole injection layer HIL is introduced into an additionally disposed p-type charge generation layer, the p-type charge generation layer, when it has the shape of a common layer between adjacent sub-pixels, can become another cause of lateral leakage.

[0134] In the organic light-emitting display device of the present invention, because the first spacer 151, which is assistedly disposed on the embankment 150, has an inverted conical shape (such that when the first spacer 151 is viewed in cross-section, the angle between the side portion and the top surface portion of the first spacer 151 is an acute angle), the organic material is broken at the first spacer 151 during the vapor deposition process, such that at least one layer of the organic stack 115 has gaps between adjacent sub-pixels.

[0135] When observing Figure 2Because the organic stack 115 can be disconnected on the side of the first spacer 151, the organic stack 115 deposited on the upper flat portion of the first spacer 151 can be isolated into an island shape. Therefore, the organic stack 115 is electrically disconnected between the first sub-pixel Sub 1 on the left side of the first spacer 151 and the second sub-pixel Sub 2 and the third sub-pixel Sub 3 on the right side of the first spacer 151, preventing lateral current leakage. More specifically, it is possible to control the occurrence of lateral current leakage in the highly conductive common layer of the organic stack 115, which could cause adjacent sub-pixels to conduct due to leakage current when a particular sub-pixel is turned on.

[0136] Furthermore, in the organic light-emitting display device of the present invention, a thin-film transistor (TFT) is disposed below an organic light-emitting diode (OLED) including a first electrode 110, an organic stack 115, and a second electrode 120, and is connected to the first electrode 110. Although in most cases the thin-film transistor (TFT) is disposed in the non-emitting portion, when a top-emitting type is applied, the thin-film transistor (TFT) can be disposed in the emitting portion.

[0137] The thin-film transistor (TFT) includes a buffer layer 101 on a substrate 100, an active layer 102 disposed in a specific region, a gate insulating layer 103 and a gate 104 sequentially formed on the center of the active layer 102, and a source 105 and a drain 106 connected to opposite ends of the active layer 102.

[0138] Here, the thin-film transistor (TFT) also includes an interlayer insulating layer 107 disposed between the active layer 102 and the flat portions of the source 105 and drain 106. The interlayer insulating layer 107 has contact holes corresponding to the regions where the active layer 102 is connected to the source 105 and drain 106.

[0139] Additionally, the thin-film transistor (TFT) includes a protective layer 108, which is configured to expose a portion of the drain 106 and cover the remainder of the drain 106 and the source 105. A first electrode 110 is disposed on the protective layer 108 and connected to the drain 106.

[0140] The first electrode 110 can be disposed in each of the sub-pixels Sub 1, Sub 2, and Sub 3, and can be larger than the emitting portion so as to at least cover the emitting portion. A portion of the first electrode 110 extending beyond the emitting portion can overlap with the embankment 150.

[0141] The organic light-emitting diode (OLED) includes: a capping layer 130 that protects a second electrode 120 formed on the entire surface and performs an output coupling function; and a package 140 in which a first inorganic layer 141, a first organic layer 142, and a second inorganic layer 143 are alternately stacked one after the other.

[0142] Package 140 may also include one or more package pairs, each comprising an organic layer and an inorganic layer.

[0143] Here, the organic stack 115, the second electrode 120, and the capping layer 130 formed after the dike 150, the first spacer 151, and the second spacer 152 are formed have The total thickness may be smaller than that of the dam 150 and the first spacer 151 and the second spacer 152, which have a thickness in the micrometer range. Therefore, in its lamination process, the organic stack 115, the second electrode 120 and the capping layer 130 may be formed along the stepped portions of the dam 150 and the first spacer 151 and the second spacer 152.

[0144] On the other hand, the encapsulator 140 is used to prevent moisture from penetrating into the organic light-emitting diode (OLED), protect the OLED from external air, and prevent foreign substances generated during the process from negatively affecting the OLED. After the encapsulator 140 is fully formed, its upper surface can be flattened. The inorganic layers 141 and 143 included in the encapsulator 140 have a thickness ranging from 1 μm to 2 μm and effectively prevent moisture penetration, while the organic layer 142 has a thickness of 10 μm and is effective in covering particles.

[0145] Alternatively, a multi-tone mask or a diffraction exposure mask can be used to form the dam 150, the first spacer 151, and the second spacer 152 together. In this case, the dam 150 can be integrally formed with the first spacer 151 or the second spacer 152.

[0146] In some cases, the embankment 150, the first spacer 151, and the second spacer 152 can be patterned separately.

[0147] *Second Implementation Method*

[0148] Figure 5 This is a plan view illustrating an organic light-emitting display device according to a second embodiment of the present invention.

[0149] like Figure 5As illustrated, in the organic light-emitting display device according to the second embodiment of the present invention, the first spacer 251 having an inverted conical shape and Figure 2 Compared to the first embodiment, it has a smaller length corresponding to the length of the second sub-pixel Sub 2.

[0150] In this case, the first spacer 251 is not adjacent to the emission portion G-EML of the third sub-pixel Sub 3. The illustrated exemplary structure is employed when the probability of the red sub-pixel being turned on by leakage current is higher than that of the green sub-pixel when the blue sub-pixel is selectively driven. Consideration is given to the second electrode (cathode) (see [reference needed]) when the first spacer 251, having an inverted conical shape, is formed over a larger area. Figure 2 and Figure 3 Due to the increased resistance of the 120 (in the image), the first spacer 251 is positioned between the blue and red sub-pixels, which has the most severe current leakage. Here, the second spacer 252, having a positive conical shape, has a length corresponding to a portion of the length of the first spacer 251 and is located between the second sub-pixel Sub 2 and the third sub-pixel Sub 3. Therefore, when used to form an organic stack (see...), Figure 2 and Figure 3 When at least one layer of the fine metal mask (115) sags due to its weight, the second spacer 252, rather than the first spacer 251, can be brought into contact with the fine metal mask first, thereby preventing the first spacer 251 or the embankment 250 from being pushed.

[0151] Other structures are the same as those in the above embodiments, and descriptions related to the corresponding parts will be omitted.

[0152] *Third Implementation Method*

[0153] Figure 6 This is a plan view illustrating an organic light-emitting display device according to a third embodiment of the present invention.

[0154] like Figure 6 As illustrated, in an organic light-emitting display device according to a third embodiment of the present invention, the first spacer 351 includes a first segment 351a parallel to the longitudinal direction of the first sub-pixel and a second segment 351b protruding from the first segment 351a and extending between the second sub-pixel and the third sub-pixel in a direction intersecting the longitudinal direction.

[0155] The first segment 351a and the second segment 351b are directly connected to each other. That is, the first segment 351a and the second segment 351b are patterned as a whole and physically connected to form the first spacer 351.

[0156] In this configuration, the organic stack 115 is electrically disconnected on the side of the first spacer 351. Therefore, the periphery of at least the emitter portion R-EML of the red subpixel is electrically disconnected in the common layer at least with the adjacent blue and green subpixels, thereby preventing lateral current leakage.

[0157] *Fourth Implementation Method*

[0158] Figure 7 This is a plan view illustrating an organic light-emitting display device according to a fourth embodiment of the present invention.

[0159] like Figure 7 As illustrated, in an organic light-emitting display device according to a fourth embodiment of the present invention, the first spacer 451 includes a first spacer pattern 451a and a second spacer pattern 451b spaced apart from each other in a single pixel P. Therefore, the first sub-pixel Sub 1 and the second sub-pixel Sub 2 are electrically disconnected, and the first sub-pixel Sub 1 and the third sub-pixel Sub 3 are also electrically disconnected.

[0160] Furthermore, in the various embodiments of the organic light-emitting display device of the present invention described above, the spacers having an inverted conical shape are typically located on the embankment between adjacent sub-pixels, such that the organic stack deposited after the spacers are formed is partially broken on the inverted conical spacers, which can prevent lateral current leakage due to the highly conductive organic layers.

[0161] In addition, when the inverted conical spacers set on the embankment have a limited length and width, the second electrode formed after the organic stack is deposited can maintain a uniform thin-film resistance for each region.

[0162] In addition, because the inverted conical spacer has a low threshold voltage Vth, when the spacer is placed around a sub-pixel that is susceptible to lateral leakage current, it can prevent adjacent sub-pixels from being turned on by leakage current.

[0163] In the following text, the effects of the organic light-emitting display device according to the comparative examples and the first to third embodiments of the present invention will be described in conjunction with various experiments.

[0164] Figure 8 This is a plan view illustrating an organic light-emitting display device according to a comparative example.

[0165] like Figure 8 As illustrated, the organic light-emitting display device according to the comparative example differs from the organic light-emitting display device of the present invention described above in that, instead of a spacer with an inverted conical shape, a conical spacer 52 is provided on the embankment 50. The comparative example does not implement the present invention, and reference is made below. Figure 9 and Figure 12The description is provided for comparison with the present invention.

[0166] In the following text, an optical microscope is used to observe the comparative examples and the low grayscale of the first to third embodiments of the present invention for each subpixel, and examples of the colors observed in the organic light-emitting display device when the actual entire screen is illuminated in blue will be described.

[0167] The organic stacked layers in the organic light-emitting diodes used in the comparative examples and the organic light-emitting display devices of the present invention have a double-stacked structure formed in the following order.

[0168] The sequence of forming the organic stack will now be described. First, a first electrode (anode) is formed on a substrate. A hole injection layer is formed on the first electrode by doping the first electrode with a p-type dopant (such as TCNQF4) at a dosage of 3 wt%. Here, the bulk of the hole injection layer is the same material as that in the first hole transport layer formed in a subsequent process. Subsequently, as the first stack, NPD is used to form a first hole transport layer comprising the same bulk as the hole injection layer. The thickness was then determined. Subsequently, an anthracene-based dopant with a thickness of 5 wt% was used to dope the material. The anthracene derivative substrate is used to form the first light-emitting layer of the blue sub-pixel, and the first electron transport layer is formed thereon. The thickness.

[0169] Subsequently, by using 1 wt% Li doping to form a thickness of The n-type charge generation layer is formed by using anthracene derivative charge generation layer as the host material, and subsequently, the p-type charge generation layer is formed by doping NPD with 15 wt% of a p-type dopant (such as TCNQ4).

[0170] As a second layer, after the second hole transport layer is formed, the second light-emitting layer is formed using the same substrate and the same dopant used for the first light-emitting layer, and subsequently, the second electron transport layer is formed.

[0171] Subsequently, a material with a 1:1 content ratio of LiQ and an electron transport layer was formed on the electron transport layer. After the thickness is achieved, Mg and LiF with a 1:1 content ratio are formed throughout the region. The thickness. Then, the second electrode is formed using Ag and Mg with a content ratio of 3:1. The thickness, and thereafter, a capping layer is formed on it and formed using NPD. The thickness.

[0172] Here, a fine metallic mask is used to deposit red, green, and blue emitting layers in each sub-pixel. The example above has described the formation of the emitting layer for the blue sub-pixel; the emitting layer for the green sub-pixel is formed on... The thickness of the red subpixel's luminescent layer is formed to... The thickness is such that other layers are shared.

[0173] The above-described structures illustrate the construction of the organic stack and the second electrode in the comparative example and the organic light-emitting display device of the present invention, and the degree of lateral current leakage is evaluated by verifying the color at G255 (high grayscale) and G31 (low grayscale) based on the same construction.

[0174] Figure 9 These are micrographs captured by an optical microscope illustrating the situation where the blue sub-pixels of the comparative example and the first to third embodiments of the present invention are turned on, and Figure 10 These are photographs illustrating a screen when the blue sub-pixel is turned on, according to a comparative example and the first to third embodiments of the present invention.

[0175] Considering the micrograph and the screen, it can be seen in the comparative example that when the blue subpixel is selectively turned on, the red subpixel is turned on by leakage current, resulting in a degradation of the purity of the blue and achieving a color close to purple.

[0176] On the other hand, when the first to third embodiments of the present invention are applied, it can be seen that the red sub-pixel is almost never turned on, and therefore the screen appears blue.

[0177] Table 1

[0178]

[0179] Figure 11 This illustrates graphs showing the normalized EL intensity of each wavelength when the blue sub-pixel is turned on, according to the comparative example and the first to third embodiments of the present invention. Figure 12 This is a view illustrating the change in color coordinates between low and high grayscale when the blue sub-pixel is turned on, according to a comparative example and a first embodiment of the present invention.

[0180] Consider Table 1 and Figure 12 The comparative examples and the first to third embodiments of the present invention show essentially no difference in color coordinates when displaying blue at high grayscale (G255). However, the comparative examples show inferior blue and a mixture of red and blue at low grayscale (G31), resulting in a degraded color purity.

[0181] Specifically, refer to Figure 11The aforementioned trend is evident, and a red wavelength appears at low grayscale (G31). This numerically indicates that even when only the blue sub-pixel is turned on in the comparative example, the red sub-pixel is also turned on by leakage current. On the other hand, in the cases of the first to third embodiments of the present invention, it can be seen that even at low grayscale, the red wavelength almost never appears and lateral current leakage is prevented.

[0182] The meaning of the length of the first spacer according to the present invention will be described below.

[0183] When the length of the emitting portion of the blue subpixel is 55 μm, the length of the first spacer is 55 μm in the first experimental example, 30 μm in the second experimental example, and 60 μm in the third experimental example. In the comparative example, no first spacer is provided.

[0184] Figure 13 This is an example of a graph showing the relative resistance based on the comparative example and the first to third experimental examples.

[0185] Figure 13 The examples illustrate the ratios of the relative resistances of the second electrode in the first to third experimental examples when the relative resistance of the second electrode is assumed to be 1 in the comparative example (without the first spacer). It can be seen that the ratio of the relative resistance is 1.33 in the first experimental example, 1.17 in the second experimental example, and 1.51 in the third experimental example, and therefore the ratio of the relative resistance is proportional to the length of the first spacer.

[0186] Figure 14 The graph illustrates the sheet resistance curves based on the comparative example and the first to third experimental examples.

[0187] Reference Figure 14 As shown in Table 2, when verifying the rate of increase in film resistance with respect to the length of the first spacer, the rate of increase in film resistance increases significantly when the length of the first spacer is greater than the length of the emitting portion of the blue sub-pixel. That is, when the length of the first spacer is less than the length of the emitting portion of the blue sub-pixel, the rate of increase in film resistance is approximately 0.04 Ω / μm to 0.05 Ω / μm, while when the length of the first spacer is greater than the length of the emitting portion of the blue sub-pixel, the rate of increase in film resistance is approximately 0.14 Ω / μm to 0.17 Ω / μm. Therefore, it can be seen that the film resistance increases by approximately three times or more in the latter case compared to the former case.

[0188] In other words, the above experiments confirm that when the length of the first spacer is less than the length of the emitting portion of the blue sub-pixel (i.e., the pixel with the longest emitting portion), the resistance of the second electrode can be uniformly maintained in the organic light-emitting display device without brightness degradation.

[0189] Table 2

[0190]

[0191] The above experiments confirm that the resistance increases significantly when the length of the first spacer is greater than the length of the emitting portion of the blue sub-pixel, and therefore the length of the first spacer needs to be limited within the range where the resistance of the thin film of the second electrode is maintained at a reliable level.

[0192] The implementation of organic light-emitting display devices has the following particular advantages.

[0193] First, spacers with an inverted conical shape are arranged on the embankment between adjacent sub-pixels, preventing lateral current leakage caused by the highly conductive organic layers in the organic stack. When inverted conical spacers with a low voltage threshold are arranged around sub-pixels susceptible to lateral leakage current, it can prevent adjacent sub-pixels from being turned on by leakage current.

[0194] Secondly, although the presence of the inverted conical spacer can increase the total sheet resistance of the second electrode, the negative impact of the increased sheet resistance can be mitigated by limiting the length and width of the inverted conical spacer set on the embankment.

[0195] Although embodiments of the invention have been described in detail above with reference to the accompanying drawings, it will be apparent to those skilled in the art that the invention is not limited to the embodiments described above, and various substitutions, modifications, and alterations can be devised within the spirit and scope of the invention. Therefore, the various embodiments disclosed herein are not intended to limit the technical spirit of the invention, and the scope of the technical spirit of the invention is not limited by these embodiments. Thus, the disclosed embodiments are provided for descriptive purposes and are not intended to limit the technical scope of this disclosure, and the technical scope of this disclosure is not limited by these embodiments. The scope of this disclosure should be interpreted based on the following claims, and all technical concepts falling within the scope of the claims should be understood to be within the scope of this disclosure.

[0196] Cross-reference to related applications

[0197] This application claims priority to Korean Patent Application No. 10-2016-0184428, filed on December 30, 2016, which is hereby incorporated by reference as fully set forth herein.

Claims

1. An organic light-emitting display device, the organic light-emitting display device comprising: A substrate comprising a plurality of pixels, the plurality of pixels including a first sub-pixel, a second sub-pixel and a third sub-pixel, each of the first sub-pixel to the third sub-pixel having an emitting portion and a non-emitting portion surrounding the emitting portion; A first electrode is located on the emitting portion of each of the first to third sub-pixels; A dam, located on the non-emission portion; A first spacer is disposed on the embankment, the embankment being at least between the emitting portion of the first sub-pixel and the emitting portion of the second sub-pixel; A second spacer is placed between the second sub-pixel and the third sub-pixel, and the second spacer is higher than the first spacer. An organic stack is located above the first electrode and the first spacer. The organic stack comprises at least two stacks and a charge-generating layer between the stacks; and The second electrode is located on the organic stack. in: At the first sub-pixel, the first color emitting layer is disposed in each of the at least two stacked layers and overlaps with each other. At the second sub-pixel, the second color emitting layer is disposed in the at least two stacked layers and overlaps with each other, and At the third sub-pixel, a third color emitting layer is disposed in each of the at least two stacked layers and overlaps with each other. The common layer of the organic stack is broken at at least one side of the first spacer.

2. The organic light-emitting display device according to claim 1, wherein the organic light-emitting display device further comprises a capping layer on the second electrode.

3. The organic light-emitting display device according to claim 1, wherein, The first spacer has an inverted conical shape.

4. The organic light-emitting display device according to claim 2, wherein, At least one of the second electrode and the capping layer has a break on at least one side of the first spacer.

5. The organic light-emitting display device according to claim 2, wherein, At least one of the organic stack, the second electrode, and the capping layer has an island shape.

6. The organic light-emitting display device according to claim 1, wherein, Among the first color emitting layer, the second color emitting layer and the third color emitting layer, the first color emitting layer has the thinnest first thickness and the second color emitting layer has the thickest second thickness.

7. The organic light-emitting display device according to claim 1, wherein: At the first sub-pixel, the first color-emitting layer has the same bulk and the same blue dopant. At the second sub-pixel, the second color-emitting layer has the same body and the same red dopant, and At the third sub-pixel, the third color emitting layer has the same body and the same green dopant.

8. The organic light-emitting display device according to claim 1, wherein, The common layer includes a hole transport layer located below the first color emitting layer, the second color emitting layer, and the third color emitting layer, an electron transport layer located on the first color emitting layer, the second color emitting layer, and the third color emitting layer, and the charge generation layer.

9. The organic light-emitting display device according to claim 1, wherein, The charge generation layer includes a p-type charge generation layer and an n-type charge generation layer.

10. The organic light-emitting display device according to claim 1, wherein, The first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

11. The organic light-emitting display device according to claim 1, wherein, At least one of the second sub-pixel and the third sub-pixel is smaller than the first sub-pixel in a first direction.

12. The organic light-emitting display device according to claim 1, wherein, The length of the first spacer in the first direction is shorter than the length of the emitting portion of the first sub-pixel in the first direction and longer than the length of the emitting portion of the second sub-pixel in the first direction.

13. The organic light-emitting display device according to claim 12, wherein, The second sub-pixel and the third sub-pixel are separated from the first sub-pixel in a second direction that intersects the first direction, and wherein the second sub-pixel and the third sub-pixel are arranged alternately in the first direction.

14. The organic light-emitting display device according to claim 12, wherein, The first spacer extends between the first sub-pixel and the third sub-pixel.

15. The organic light-emitting display device according to claim 12, wherein, The first sub-pixel extends at least to the edge of the third sub-pixel in the first direction, the edge being located on the side of the third sub-pixel away from the second sub-pixel.

16. The organic light-emitting display device according to claim 1, wherein, The first spacer includes a first segment located between the first sub-pixel and the second sub-pixel and a second segment located between the second sub-pixel and the third sub-pixel, wherein the first segment and the second segment are directly connected.

17. The organic light-emitting display device according to claim 1, wherein, The first spacer includes a first segment located between the first sub-pixel and the second sub-pixel and a second segment located between the first sub-pixel and the third sub-pixel, and the first segment and the second segment are separated in a first direction.

18. The organic light-emitting display device according to claim 17, wherein, In a second direction that intersects with the first direction, the second segment is longer than the size of the second sub-pixel or the size of the third sub-pixel.

19. The organic light-emitting display device according to claim 18, wherein, The first spacer has a width ranging from 1 μm to 5 μm in the second direction.

20. The organic light-emitting display device according to claim 1, wherein, The threshold voltage of the first sub-pixel is the highest among the first sub-pixel to the third sub-pixel.

21. The organic light-emitting display device according to claim 2, wherein, The total thickness of the organic stack, the second electrode, and the capping layer is less than the thickness of the dam or the first spacer.

22. An organic light-emitting display device, comprising: A substrate comprising multiple pixels, the multiple pixels including a first sub-pixel, a second sub-pixel and a third sub-pixel, at least one of the first sub-pixel to the third sub-pixel having an emitting portion and a non-emitting portion; The first electrode corresponding to the first sub-pixel to the third sub-pixel; The dam on the first electrode; A first spacer is disposed on the embankment, the embankment being at least between the first sub-pixel and the second sub-pixel; A second spacer is placed between the second sub-pixel and the third sub-pixel, and the second spacer is higher than the first spacer. An organic stack disposed on the first electrode and the first spacer, the organic stack comprising at least two stacks and at least one charge-generating layer between the stacks; as well as The second electrode on the organic stack The organic stack includes at least two identical color-emitting layers at the first sub-pixel, at least two identical color-emitting layers at the second sub-pixel, and at least two identical color-emitting layers at the third sub-pixel. in: Each of at least two identical color-emitting layers at the first sub-pixel includes a first color-emitting layer. Each of at least two identical color-emitting layers at the second sub-pixel includes a second color-emitting layer, and Each of the at least two identical color emitting layers at the third sub-pixel includes a third color emitting layer, and The common layer of the organic stack is broken at at least one side of the first spacer.

23. The organic light-emitting display device according to claim 22, wherein the organic light-emitting display device further comprises a capping layer on the second electrode.

24. The organic light-emitting display device according to claim 22, wherein, The first spacer has an inverted conical shape.

25. The organic light-emitting display device according to claim 23, wherein, At least one of the organic stack, the second electrode, and the capping layer has a break in at least one side of the first spacer.

26. The organic light-emitting display device according to claim 23, wherein, At least one of the organic stack, the second electrode, and the capping layer has an island shape.

27. The organic light-emitting display device according to claim 22, wherein, Among the first color emitting layer, the second color emitting layer and the third color emitting layer, the first color emitting layer has the thinnest first thickness and the second color emitting layer has the thickest second thickness.

28. The organic light-emitting display device according to claim 22, wherein: At the first sub-pixel, the first color emitting layer at each of at least two stacked layers has the same bulk and the same blue dopant. At the second sub-pixel, the second color emitting layer at each of at least two stacked layers has the same body and the same red dopant, and At the third sub-pixel, the third color emitting layer at each of at least two stacked layers has the same body and the same green dopant.

29. The organic light-emitting display device according to claim 22, wherein, The common layer also includes a hole transport layer located below the first color emitting layer, the second color emitting layer and the third color emitting layer, and an electron transport layer located above the first color emitting layer, the second color emitting layer and the third color emitting layer.

30. The organic light-emitting display device according to claim 22, wherein, The charge generation layer includes a p-type charge generation layer and an n-type charge generation layer.

31. The organic light-emitting display device according to claim 22, wherein, The first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

32. The organic light-emitting display device according to claim 22, wherein, At least one of the second sub-pixel and the third sub-pixel is smaller than the first sub-pixel in a first direction.

33. The organic light-emitting display device according to claim 22, wherein, The length of the first spacer in the first direction is shorter than the length of the emitting portion of the first sub-pixel in the first direction and longer than the length of the emitting portion of the second sub-pixel in the first direction.

34. The organic light-emitting display device according to claim 33, wherein, The second sub-pixel and the third sub-pixel are separated from the first sub-pixel in a second direction intersecting the first direction, and wherein the second sub-pixel and the third sub-pixel are arranged alternately in the first direction.

35. The organic light-emitting display device according to claim 34, wherein, The first spacer extends between the first sub-pixel and the third sub-pixel.

36. The organic light-emitting display device according to claim 35, wherein, The first sub-pixel extends at least to the edge of the third sub-pixel in the first direction, the edge being located on the side of the third sub-pixel away from the second sub-pixel.

37. The organic light-emitting display device according to claim 22, wherein, The first spacer includes a first segment located between the first sub-pixel and the second sub-pixel and a second segment located between the second sub-pixel and the third sub-pixel, wherein the first segment and the second segment are directly connected.

38. The organic light-emitting display device according to claim 22, wherein, The first spacer includes a first segment located between the first sub-pixel and the second sub-pixel and a second segment located between the first sub-pixel and the third sub-pixel, wherein the first segment and the second segment are separated in a first direction.

39. The organic light-emitting display device according to claim 38, wherein, In a second direction that intersects with the first direction, the second segment is longer than the size of the second sub-pixel or the size of the third sub-pixel.

40. The organic light-emitting display device according to claim 39, wherein, The first spacer has a width in the range of 1 μm to 5 μm in the second direction.

41. The organic light-emitting display device according to claim 22, wherein, Among the first sub-pixel to the third sub-pixel, the first sub-pixel has the highest threshold voltage.

42. The organic light-emitting display device according to claim 23, wherein, The total thickness of the organic stack, the second electrode, and the capping layer is less than the thickness of the dam or the first spacer.

Images