Display device comprising spacer and manufacturing method thereof

Abstract

Disclosed is a display device 100 with a substrate having a folding area, a thin film transistor disposed on the substrate, a bank 140 on the thin film transistor, organic luminous elements on the substrate, and pairs of spacers 150, 160, in the folded area. The spacers arranged in two rows in parallel on the bank between adjacent organic luminous elements, and have an inverse tapered shape. The substrate may include a flat area with a plurality of pairs of spacers in the flat and folded areas. The spacer pairs may be placed non-parallel to the folding axis. The display may have an organic layer that overlaps the bank including between the spacers. The organic layer slopes towards the inside edges of the lower surface of the spacers.

Description

[00063] In an example, a distance between one end 315 of the first spacer 310 and one end 313 of the bank 305 may correspond to (more specifically, be equal to) a distance between one end 325 of the second spacer 320 and the other end 317 of the bank 305. In some cases, referring to the drawings, a distance between one end 315 of the first spacer 310 and one end 313 of the bank 305 may be interpreted as a minimum distance between an extension line extending one end 315 of the first spacer 310 and an extension line extending one end 313 of the bank 305. In addition, a distance between one end 325 of the second spacer 320 and the other end 317 of the bank 305 may be interpreted as the minimum distance between an extension line extending one end 325 of the second spacer 320 and an extension line extending the other end 317 of the bank 305.

[00064] In an example, a width of the mask 330 disposed in the edge region may be maintained constant despite a change in the shape of the mask 330 disposed in the central region. That is, the width of the mask 330 disposed in the edge region may appear to be constant in FIGS. 4 and 5 to be described later.

[00065] In an example, the distance between one end 315 of the first spacer 310 and one end 313 of the bank 305 and the distance between one end 325 of the second spacer 320 and the other end 317 of the bank 305 may be maintained constant despite the change in size (or width) of the first spacer 310 and the second spacer 320. That is, the positions of one end 315 of the first spacer 310 and one end 325 of the second spacer 320 may be constantly maintained on the bank.

[00066] In an example, the first spacer 310 and the second spacer 320 may be implemented in shapes corresponding to each other. For example, a width of the upper surface, a width of the lower surface, a height, and a taper angle of each of the first spacer 310 and the second spacer 320 may be implemented to be the same, however, are not limited thereto, and may be implemented differently within an error range or according to design needs .

[00067] FIG. 4 is a diagram for explaining a crosssection corresponding to a second position of a display device according to an example of the present disclosure. Specifically, FIG. 4 illustrates an example of a cross section B-B' of FIG. 2. Hereinafter, in relation to FIG. 4, there will be omitted the content overlapping with the content described in FIG. 3.

[00068] Referring to FIG. 4, a mask 430 may be formed in the edge region and the central region. Accordingly, a separation distance between a first spacer 410 and a second spacer 420 may be increased compared to the case of FIG. 3. For example, the separation distance between the first spacer 410 and the second spacer 420 may be 2.2 pm.

[00069] In an example, the first spacer 410 and the second spacer 420 may be implemented in an inverse tapered shape. However, a width of at least one of an upper surface and a lower surface of a spacer constituting the inverse tapered shape may be changed as a portion of the mask 430 is disposed in the central region and the separation distance between the spacers increases. For example, a width of the upper surface of each of the first spacer 410 and the second spacer 420 may decrease in response to an increase in the separation distance between the first spacer 410 and the second spacer 420. As another example, a width of the lower surface of each of the first spacer 410 and the second spacer 420 may decrease in response to an increase in the separation distance between the first spacer 410 and the second spacer 420. As another example, the width of the upper surface of each of the first spacer 410 and the second spacer 420 may increase in response to an increase in a width of the mask 430 disposed in the central region.

[00070] In an example, despite the change in a separation distance between the first spacer 410 and the second spacer 42 0 and the width of the upper surface or the lower surface, a distance between one end 413 of the bank 405 and one end 415 of the first spacer 410 and a distance between the other end 417 of the bank 405 and one end 425 of the second spacer 420 may be maintained to be constant. That is, the distance between one end 413 of the bank 405 and one end 415 of the first spacer 410 and the distance between the other end 417 of the bank 405 and one end 425 of the second spacer 420 may be maintained to the same as in the case of FIG. 3.

[00071] FIG. 5 is a diagram for explaining a crosssection corresponding to a third position of a display device according to an example of the present disclosure. Specifically, FIG. 5 illustrates an example of a crosssection C-C' of FIG. 2. Hereinafter, in relation to FIG. 5, there will be omitted the content overlapping with the content described in FIG. 3 or FIG. 4.

[00072] Referring to FIG. 5, a mask 530 may be formed in the edge region and the central region as in FIG. 4. However, in the case of FIG. 5, a width of the mask 530 disposed in the central region may be increased more than in the case of FIG. 4. Accordingly, a separation distance between a first spacer 510 and a second spacer 520 may be increased compared to the case of FIG. 4. For example, the separation distance between the first spacer 510 and the second spacer 520 may be 3.8 pm.

[00073] In an example, the first spacer 510 and the second spacer 520 may be implemented in an inverse tapered shape. However, a width of at least one of the upper and lower surfaces of the spacer constituting the inverse tapered shape may be changed as the width of the mask 530 disposed in the central region changes. For example, the width of the upper surface of each of the first spacer 510 and the second spacer 520 may decrease in response to an increase in the separation distance between the first spacer 510 and the second spacer 520. As another example, the width of the lower surface of each of the first spacer 510 and the second spacer 520 may decrease in response to an increase in the separation distance between the first spacer 510 and the second spacer 520. As another example, the width of the upper surface of each of the first spacer 510 and the second spacer 520 may increase in response to an increase in the width of the mask 530 disposed in the central region.

[00074] In the example, despite the change in the separation distance between the first spacer 510 and the second spacer 52 0 and the width of the upper surface or the lower surface, a distance between one end 513 of a bank 505 and one end 515 of the first spacer 510 and a distance between the other end 517 of the bank 505 and one end 525 of the second spacer 520 may be maintained constant. That is, a distance between one end 513 of the bank 505 and one end 515 of the first spacer 510 and a distance between the other end 517 of the bank 405 and one end 525 of the second spacer 520 may be kept the same as in the case of FIG. 3 or FIG. 4.

[00075] As described above, FIGS. 3 to 5 are cross-sectional views of the display device at three positions A-A', B-B', and C-C' in FIG. 2. In this regard, the mask 330 of FIG. 3, the mask 430 of FIG. 4, and the mask 530 of FIG. 5 may be different masks. Alternatively, at least one of the mask 330 of FIG. 3, the mask 430 of FIG. 4, and the mask 530 of FIG. 5 may be a different mask from the others. Alternatively, the mask 330 of FIG. 3, the mask 430 of FIG. 4, and the mask 530 of FIG. 5 may be different parts of one mask (e.g., the mask 230 of FIG. 2).

[00076] In addition, the bank 305 of FIG. 3, the bank 405 of FIG. 4, and the bank 505 of FIG. 5 may be different banks (i.e., separate banks). Alternatively, at least one of the bank 305 of FIG. 3, the bank 405 of FIG. 4 and the bank 505 of FIG. 5 may be a different bank from the others. Alternatively, the bank 305 of FIG. 3, the bank 405 of FIG. 4, and the bank 505 of FIG. 5 may be different parts of one bank (e.g., the bank 140 of FIG. 1).

[00077] In addition, the first spacer 310 of FIG. 3, the first spacer 410 of FIG. 4 and the first spacer 510 of FIG. 5 may be disposed in the first area 210 of FIG. 2, and may be different first spacers. Alternatively, at least one of the first spacer 310 of FIG. 3, the first spacer 410 of FIG. 4 and the first spacer 510 of FIG. 5 may be a first spacer different from the others. Alternatively, the first spacer 310 of FIG. 3, the first spacer 410 of FIG. 4 and the first spacer 510 of FIG. 5 may be different parts in one and the same first spacer (e.g., first spacer 150 in FIG. 1).

[00078] In addition, the second spacer 320 of FIG. 3, the second spacer 420 of FIG. 4 and the second spacer 520 of FIG. 5 may be disposed in the second area 220 of FIG. 2, and may be different second spacers. Alternatively, at least one of the second spacer 320 of FIG. 3, the second spacer 420 of FIG. 4 and the second spacer 520 of FIG. 5 may be a second spacer different from the others. Alternatively, the second spacer 320 of FIG. 3, the second spacer 420 of FIG. 4 and the second spacer 520 of FIG. 5 may be different parts in one and the same second spacer (e.g., second spacer 160 in FIG. 1).

[00079] FIG. 6 is a diagram for explaining the arrangement of a spacer and a luminous element of a display device according to an example of the present disclosure. Specifically, FIG. 6 conceptually illustrates a plane in which a plurality of spacers (or a plurality of spacer structure assemblies) formed in two rows (or double lines) respectively are disposed.

[00080] Referring to FIG. 6, a spacer (or spacer structure assembly) 640 may be disposed adjacent to luminous elements 610, 620 and 630. In an example, the luminous elements 610, 620 and 630 may be included in the organic layer 130 of FIG. 1. The luminous elements 610, 620 and 630 are illustratively illustrated in order to describe the plane on which the spacer 640 is disposed in a wider range, and the present example is not limited thereto .

[00081] In an example, the spacer 640 may be disposed to have a predetermined (pre-specified) separation distance from the luminous elements 610, 620 and 630. In this case, a position at which the spacer 640 is disposed may be predetermined. For example, the spacer 640 may be disposed at a predetermined position to have a predetermined (pre-specified) separation distance above, below, left, and right of the luminous elements 610, 620 and 630 as shown. In addition, an arrangement angle or arrangement form of the spacers 640 with respect to the luminous elements 610, 620 and 630 may be predetermined.

[00082] In some cases, the spacer 640 may be disposed to have a predetermined separation distance from an opening. In this case, the opening may correspond to a region in which the luminous elements 610, 620 and 630 are formed.

[00083] In an example, the spacer 640 may include a first spacer and a second spacer, and the first spacer and the second spacer may be arranged in two rows in parallel. The separation distance between the first spacer and the second spacer may be implemented in a form indicating an increase or decrease. Due to the change in the separation distance, an intermediate plane or an intermediate space (the space between the first spacer and the second spacer) viewed from above the first spacer and the second spacer may have a rhombus shape as illustrated.

[00084] Although not shown, a bank may be disposed at the lower end of the spacer 640. The cross-section of the spacer 640 may be implemented in an inverse tapered shape, and the width of the upper surface or the lower surface of the spacer may be changed according to a change in the distance between the two spacers (that is, the first spacer and the second spacer) arranged in two rows (or double lines), that is, the separation distance.

[00085] As described above, each spacer 640 illustrated in FIG. 6 may be a spacer structure assembly including a first spacer and a second spacer spaced apart from each other, and may be disposed between two adjacent luminous elements (or two pixels or two light emitting regions) of the display device.

[00086] The separation distance between the first spacer and the second spacer included in each spacer 640 illustrated in FIG. 6 is not constant, and may vary depending on the position. To this end, the width of the first spacer included in each spacer 640 illustrated in FIG. 6 may not be uniform as shown in FIGS. 3 to 5, and may vary according to positions. In addition, the width of the second spacer included in each spacer 640 illustrated in FIG. 6 may not be uniform as shown in FIGS. 3 to 5, and may vary according to positions.

[00087] FIG. 6 illustrates an example (example of linear change) of a change in the separation distance between the first spacer and the second spacer included in each spacer 640, that is, which illustrates a case in which an intermediate plane or an intermediate space (a space between the first spacer and the second spacer) is implemented in a rhombus shape. However, the present disclosure is not limited thereto, and the space shape (e.g., rhombus, elliptical, circular, etc.) between the first spacer and the second spacer may vary depending on the shape of the change in the separation distance between the first spacer and the second spacer. It will be described another example (an example of a non-linear change) of a change in the separation distance between the first spacer and the second spacer in more detail with reference to FIG. 7.

[00088] FIG. 7 is a diagram for explaining a spacer of a display device and a mask for forming the spacer according to another example of the present disclosure.

[00089] FIG. 7 illustrates an example in which the change of the separation distance is implemented in a form different from that of FIG. 2 or FIG. 6. That is, FIG. 7 illustrates a case in which the degree of change in the separation distance between the first spacer and the second spacer is smaller than that of FIGS. 2 or 6. In this case, as shown, a mask 701 in a central region 710 may have a shape in which ellipses are arranged. In this case, the separation distance between the first spacer and the second spacer at different positions may be different.

[00090] In an example, the mask 701 in an edge region 720 may have a straight line or a rectangular shape. That is, the shape of the mask 701 in the edge region 720 may be maintained constant independent of the degree of change in the separation distance.

[00091] Since a mask 701 in the central region 710 has a shape in which ellipses are arranged, if there is a change in the separation distance between the first spacer and the second spacer, the width of the upper surface or the lower surface of the first spacer and the second spacer may also change in response to the change in the separation distance. For example, as the separation distance increases, the width of the upper surface or the lower surface of the first spacer and the second spacer may decrease.

[00092] A first area 731 and a second area 732 may bean opening area of the mask 701. That is, a material constituting the mask 701, for example, a metal material (e.g., CrOx, Cr) may be not disposed in the first area 731 and the second area 732, so that the first area 731 and the second area 732 may be perforated. In this case, when light is irradiated over the mask 701, the light may reach the material disposed in each of the first area 731 and the second area 732 under the mask 701. In the central region and the edge region where the mask 701 is disposed, light may be blocked by the mask 701, so that light may not reach a material (e.g., photoresist) disposed under the mask 701. Since the content (for example, the way or method) of forming the spacer using light exposure has been described above, it will be omitted a detailed description thereof.

[00093] FIG. 8 is a diagram for explaining an application example of a display device according to an example of the present disclosure. Specifically, FIG. 8 illustrates an example of a display device to which a spacer is applied according to an example of the present disclosure.

[00094] Referring to FIG. 8, a mobile terminal may be implemented as a display device including a display in which a display panel is arranged as a main element thereof. As illustrated, a part of the mobile terminal (hereinafter, the display device) may be folded or bent, and in this case, an active area of the display device may be deformed in response to the folding or bending of the display device.

[00095] According to an example, the display device may include a folded area 810 and a flat area 820. The reference numeral 815 indicates an enlarged example of the spacer arrangement portion in the folded area 810. The reference numeral 825 indicates an enlarged example of the spacer arrangement portion in the flat area 820.

[00096] The folded area 810 may include a spacer structure assembly 817 comprising at least two spacers which are formed in a row respectively and exhibit a change in separation distance from each other. In this case, there may be minimized a peeling of the luminous elements (or the light emitting layer) that may occur due to the folding of the folded area 810. The flat area 820 may include a spacer structure assembly 827 comprising at least two spacers formed in rows and having a constant separation distance therebetween.

[00097] In an example, the folded area 810 and the flat area 820 may be predetermined in advance. For example, the folded area 810 may be predetermined to correspond to an area where a pressure is generated due to folding, and the flat area 820 may be predetermined as a display area excluding the folded area 810.

[00098] In some cases, the folded area 810 may include a predetermined area including the outermost portion of the display area or a predetermined area including a portion in which a hole is formed in the display area.

[00099] FIG. 8 illustrates a case in which a spacer structure assembly 817 comprising at least two spacers formed in a row respectively and having a change in separation distance from each other is disposed in the folded area 810, but the present disclosure is not limited thereto. In some case, the spacer structure assembly 817 comprising at least two spacers may be disposed in at least a portion of the flat area 820. [000100] Meanwhile, the present disclosure illustrates a case in which two spacers are formed in a spacer structure assembly as an example, but the present disclosure is not limited thereto, and two or more spacers may be formed in a spacer structure assembly (specifically, in one and the same spacer structure assembly) . In addition, if two or more spacers are formed in a spacer structure assembly, the distance between adjacent spacers may correspond to the separation distance, and accordingly, the arrangement or size of the spacers may be designed to implement a change in the separation distance. [000101] FIG. 9 illustrates a flow of each step of a manufacturing method of a display device according to an example of the present disclosure. Each step of the manufacturing method illustrated in FIG. 9 may be performed in a different order from that illustrated in the drawings in some cases. In addition, in the following, it will be omitted the content overlapping with the previously described content. [000102] Referring to FIG. 9, in step 910, a thin film transistor may be disposed on a substrate. The substrate is a plate on which various components of the display device are formed, and various known substrates may be used. The thin film transistor is a transistor formed using a thin film and may be configured to control light emission from a display device. [000103] In step 920, a bank may be disposed on the thin film transistor. The bank may be configured to divide pixels. However, the present disclosure is not limited thereto, and the bank may perform additional functions within a range understandable to those of ordinary skill in the art not described in this disclosure. [000104] In step 930, a photoresist, for example a photoresist of a negative type, may be disposed (or applied) on the bank. The photoresist of the negative type may be a photoresist that cures when exposed to light. The photoresist of the negative type may use, for example, an epoxy-based polymer, but is not limited thereto. [000105] In step 940, a photolithography or a light exposure for the photoresist may be performed by using a mask corresponding to the shape of a spacer structure assembly comprising at least two spacers (e.g., a first spacer and a second spacer) having different separation distances from each other at a first position and at a second position. Specifically, the distance between the at least two spacers at the first position and the distance between the at least two spacers at the second position may be different from each other. The light exposure may be performed using a mask reflecting a distance difference between the first position and the second position. An example of a mask may refer to FIG. 2 or FIG. 7. [000106] Here, the first position may correspond to one cross-section of at least two spacers configured in at least two rows. The second position may correspond to another or a different cross-section of the at least two spacers configured in at least two rows. [000107] In an example, when light exposure is performed in a state in which the mask is disposed, the light reaches an exposed portion of the photoresist in the region of the mask, so that the exposed portion of the photoresist may be cured. Although not shown, the mask may be removed after light exposure is performed, and etching may be performed on the remaining uncured region. A cured portion may thus remain on the bank, which may correspond to a spacer. [000108] The display device according to an example of the present disclosure includes a spacer structure assembly comprising at least two spacers having an inverse tapered shape and arranged in at least two rows, so that it is possible to minimize the deformation due to pressure applied to the display device by improving the adhesion of the light emitting layer of the display device. [000109] In addition, in the manufacturing method of a display device according to an example of the present disclosure, a spacer structure assembly comprising at least two spacers is formed using a mask of a pattern in which the width of the central region thereof changes, so that it is possible to minimize a distance between the at least two spacers, that is, a separation distance. The width (or area) of the bank may also be reduced by minimizing the separation distance, so that the resolution of the display device may be improved. Further examples are set out in the numbered clauses below: 1. A display device comprising: a thin film transistor disposed on a substrate; a bank disposed on the thin film transistor; and a spacer structure assembly comprising at least two spacers disposed on the bank and having different separation distances from each other at a first position and at a second position. 2. The display device of clause 1, wherein the spacer structure assembly is disposed between two adjacent luminous elements, two pixels or two light emitting regions of the display device. 3. The display device of clause 1, wherein each of the at least two spacers is formed in a row having a change in a width and the at least two spacers are arranged side by side on the bank. 4. The display device of clause 1, wherein a separation distance between the at least two spacers is inversely proportional to a width of one surface of the at least two spacers . 5. The display device of clause 4, wherein the one surface of the at least two spacers is an upper surface or a lower surface of one of the at least two spacers. 6. The display device of clause 1, wherein a width of an upper surface or a lower surface of one of the at least two spacers decreases in response to an increase in the separation distance between the at least two spacers. 7. The display device of clause 1, wherein a height of each of the at least two spacers at the first position is equal to a height of each of the at least two spacers at the second position. 8. The display device of clause 1, wherein the at least two spacers comprises a first spacer and a second spacer, and a distance between one end of the first spacer and one end of the bank is equal to a distance between one end of the second spacer and the other end of the bank. 9. The display device of clause 1, wherein each of the at least two spacers has an inverse tapered shape. 10. The display device of clause 1, wherein a width of a first side adjacent to the bank of one of the at least two spacers is smaller than a width of a second side opposite to the first side of the one of the at least two spacers. 11. The display device of clause 1, wherein the at least two spacers are formed by using a photoresist of a negative type. 12. The display device of clause 1, wherein an exposure amount for forming the at least two spacers is inversely proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers . 13. The display device of clause 1, wherein a height of one of the at least two spacers is proportional to a separation distance between the at least two spacers or a taper angle of the one of the at least two spacers. 14. The display device of clause 1, wherein the at least two spacers are arranged to have a predetermined separation distance from a luminous element of the display device. 15. The display device of clause 1, wherein the first position corresponds to one cross-section of at least two spacers configured in at least two rows, and the second position corresponds to another cross-section of the at least two spacers configured in at least two rows. 16. The display device of clause 1, wherein one of the at least two spacers in the first positon and the one of the at least two spacers in the second position are different spacers or are different parts in one and the same spacer. 17. The display device of clause 1, wherein the at least two spacers have the same width, height and tape angle, or the at least two spacers have diffeent widths, heights and / or taper angles. 18. The display device of clause 1, wherein a space between the at least two spacers viewed from above the at least two spacers has a rhombus shape, an elliptical shape or a circular shape. 19. The display device of clause 1, further comprising: a passivation layer disposed on the thin film transistor and on which the bank is formed; an electrode formed on the passivation layer; and an organic layer formed on at least a portion of each of the electrode and the bank. 20. The display device of clause 1, wherein the display device includes a folded area and a flat area, and the spacer structure assembly is disposed in the folded area and / or at least a portion of the flat area. 21. A manufacturing method of a display device comprising: disposing a thin film transistor on a substrate; disposing a bank on the thin film transistor;disposing a photoresist on the bank; and performing photolithography for the photoresist by using a mask corresponding to the shape of a spacer structure assembly comprising at least two spacers having different separation distances from each other at a first position and at a second position. 22. The manufacturing method of clause 21, wherein a photoresist of a negative type is used as the photoresist. 23. The manufacturing method of clause 21, wherein each of the at least two spacers is formed in a row having a change in a width. 24. The manufacturing method of clause 21, wherein a separation distance between the at least two spacers is set to be inversely proportional to a width of one surface of the at least two spacers. 25. The manufacturing method of clause 21, wherein a height of each of the at least two spacers at the first position is set to be equal to a height of each of the at least two spacers at the second position. 26. The manufacturing method of clause 21, wherein the at least two spacers are formed to comprise a first spacer and a second spacer, and a distance between one end of the first spacer and one end of the bank is set to be euqal to a distance between one end of the second spacer and the other end of the bank. 27. The manufacturing method of clause 21, wherein each of the at least two spacers is formed to have an inverse tapered shape. 28. The manufacturing method of clause 21, wherein an exposure amount for forming the at least two spacers is set to be inversely proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers. 29. The manufacturing method of clause 21, wherein a height of the at least two spacers is set to be proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers . [000110] Although the examples of the present disclosure have been described in more detail with reference to the accompanying drawings, the present disclosure is not necessarily limited to these examples, and various modifications may be possible within the scope of the present disclosure. Accordingly, the examples disclosed in the present disclosure are not intended to limit the present disclosure, but to exemplarily explain the present disclosure, and the scope of the present disclosure is not limited by these examples. Therefore, there should be understood that the examples described above are illustrative in all respects and not restrictive. The protection scope of the present disclosure should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as 5 being included in the scope of the present disclosure. Below follow a list of numbered items. These items may be combined with any other features described herein in any combination beyond those expressly stated below: 1. A display device comprising: a thin film transistor disposed on a substrate; a bank disposed on the thin film transistor; and a spacer structure assembly comprising at least two spacers disposed on the bank and having different separation distances from each other at a first position and at a second position. 2. The display device of item 1, wherein the spacer structure assembly is disposed between two adjacent luminous elements, two pixels or two light emitting regions of the display device. 3. The display device of item 1 or item 2, wherein each of the at least two spacers is formed in a row having a change in a width and the at least two spacers are arranged side by side on the bank. 4. The display device of item 1, wherein a separation distance between the at least two spacers is inversely proportional to a width of one surface of the at least two spacers . 5. The display device of item 4, wherein the one surface of the at least two spacers is an upper surface or a lower surface of one of the at least two spacers. 6. The display device of any one of the preceding items, wherein a width of an upper surface or a lower surface of one of the at least two spacers decreases in response to an increase in the separation distance between the at least two spacers. 7. The display device of any one of the preceding items, wherein a height of each of the at least two spacers at the first position is equal to a height of each of the at least two spacers at the second position. 8. The display device of any one of the preceding items, wherein the at least two spacers comprises a first spacer and a second spacer, and a distance between one end of the first spacer and one end of the bank is equal to a distance between one end of the second spacer and the other end of the bank. 9. The display device of any one of the preceding items wherein each of the at least two spacers has an inverse tapered shape. 10. The display device of any one of the preceding items, wherein a width of a first side adjacent to the bank of one of the at least two spacers is smaller than a width of a second side opposite to the first side of the one of the at least two spacers. 11. The display device of any one of the preceding items, wherein the at least two spacers are formed by using a photoresist of a negative type. 12. The display device of any one of the preceding items, wherein an exposure amount for forming the at least two spacers is inversely proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers. 13. The display device of any one of the preceding items, wherein a height of one of the at least two spacers is proportional to a separation distance between the at least two spacers or a taper angle of the one of the at least two spacers. 14. The display device of any one of the preceding items, wherein the at least two spacers are arranged to have a predetermined separation distance from a luminous element of the display device. 15. The display device of any one of the preceding items, wherein the first position corresponds to one cross-section of at least two spacers configured in at least two rows, and the second position corresponds to another cross-section of the at least two spacers configured in at least two rows. 16. The display device of any one of the preceding items, wherein one of the at least two spacers in the first positon and the one of the at least two spacers in the second position are different spacers or are different parts in one and the same spacer. 17. The display device of any one of the preceding items, wherein the at least two spacers have the same width, height and tape angle, or the at least two spacers have diffeent widths, heights and / or taper angles. 18. The display device of any one of the preceding items, wherein a space between the at least two spacers viewed from above the at least two spacers has a rhombus shape, an elliptical shape or a circular shape. 19. The display device of any one of the preceding items, further comprising: a passivation layer disposed on the thin film transistor and on which the bank is formed; an electrode formed on the passivation layer; and an organic layer formed on at least a portion of each of the electrode and the bank. 20. The display device of any one of the preceding items, wherein the display device includes a folded area and a flat area, and the spacer structure assembly is disposed in the folded area and / or at least a portion of the flat area. 21. A manufacturing method of a display device comprising: disposing a thin film transistor on a substrate; disposing a bank on the thin film transistor; disposing a photoresist on the bank; and performing photolithography for the photoresist by using a mask corresponding to the shape of a spacer structure assembly comprising at least two spacers having different separation distances from each other at a first position and at a second position. 22. The manufacturing method of item 21, wherein a photoresist of a negative type is used as the photoresist. 23. The manufacturing method of item 21 or item 22, wherein each of the at least two spacers is formed in a row having a change in a width. 24. The manufacturing method of any one of items 21 to 23, wherein a separation distance between the at least two spacers is set to be inversely proportional to a width of one surface of the at least two spacers. 25. The manufacturing method of item 21, wherein a height of each of the at least two spacers at the first position is set to be equal to a height of each of the at least two spacers at the second position. 26. The manufacturing method of item 21, wherein the at least two spacers are formed to comprise a first spacer and a second spacer, and a distance between one end of the first spacer and one end of the bank is set to be euqal to a distance between one end of the second spacer and the other end of the bank. 27. The manufacturing method of item 21, wherein each of the at least two spacers is formed to have an inverse tapered shape. 28. The manufacturing method of item 21, wherein an exposure amount for forming the at least two spacers is set to be inversely proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers. 29. The manufacturing method of item 21, wherein a height of the at least two spacers is set to be proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers . Below follow a list of numbered aspects. These aspects may be combined with any other features described herein in any combination beyond those expressly stated below: 1. A display device comprising: a thin film transistor disposed on a substrate; a bank disposed on the thin film transistor; and a spacer structure assembly comprising at least one pair of spacers disposed on the bank and having separation distance that changes along the length of the spacers; wherein the display device is a foldable device having a folded area. 2. The display device of aspect 1, wherein the folded area includes the spacer structure assembly. 3. The display device of aspect 2, wherein the distance between adjacent spacers is correspond to the separation distance. 4. The display device of aspect 1, wherein the folded area is predetermined to correspond to an area where a pressure is generated due to folding. 5. The display device of aspect 1, wherein comprising a display area excluding the folded area, the folded area includes a predetermined area including the outermost portion of the display area or a predetermined area including a portion in which a hole is formed in the display area. 6. The display device of aspect 1, wherein the spacer structure assembly is disposed between two adjacent luminous elements, two pixels or two light emitting regions of the display device. 7. The display device of aspect 1, wherein each of the at least two spacers is formed in a row having a change in a width and the at least two spacers are arranged side by side on the bank. 8. The display device of aspect 1, wherein a separation distance between the at least two spacers is inversely proportional to a width of one surface of the at least two spacers . 9. The display device of aspect 8, wherein the one surface of the at least two spacers is an upper surface or a lower surface of one of the at least two spacers. 10. The display device of any one of the preceding aspects, wherein a width of an upper surface or a lower surface of one of the at least two spacers decreases in response to an increase in the separation distance between the at least two spacers. 11. The display device of any one of the preceding aspects, wherein a height of each of the at least two spacers at a first position along the length of the spacers is equal to a height of each of the at least two spacers at a second position along the length of the spacers. 12. The display device of any one of the preceding aspects, wherein the at least two spacers comprises a first spacer and a second spacer, and a distance between one end of the first spacer and one end of the bank is equal to a distance between one end of the second spacer and the other end of the bank. 13. The display device of any one of the preceding aspects, wherein each of the at least two spacers has an inverse tapered shape. 14. The display device of any one of the preceding aspects, wherein a width of a first side adjacent to the bank of one of the at least two spacers is smaller than a width of a second side opposite to the first side of the one of the at least two spacers. 15. The display device of any one of the preceding aspects, wherein the at least two spacers are formed by using a photoresist of a negative type. 16. The display device of any one of the preceding aspects, wherein an exposure amount for forming the at least two spacers is inversely proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers. 17. The display device of any one of the preceding aspects, wherein a height of one of the at least two spacers is proportional to a separation distance between the at least two spacers or a taper angle of the one of the at least two spacers. 18. The display device of any one of the preceding aspects, wherein the at least two spacers are arranged to have a predetermined separation distance from a luminous element of the display device. 19. The display device of any one of the preceding aspects, wherein a first position along the length of the spacers corresponds to one cross-section of at least two spacers configured in at least two rows, and a second position along the length of the spacers corresponds to another cross-section of the at least two spacers configured in at least two rows. 20. The display device of any one of the preceding aspects, wherein one of the at least two spacers at a first position along the length of the spacers and the one of the at least two spacers in a second position along the length of the spacers are different spacers or are different parts in one and the same spacer. 21. The display device of any one of the preceding aspects, wherein the at least two spacers have the same width, height and tape angle, or the at least two spacers have different widths, heights and / or taper angles. 22. The display device of any one of the preceding aspects, wherein a space between the at least two spacers viewed from above the at least two spacers has a rhombus shape, an elliptical shape or a circular shape. 23. The display device of any one of the preceding aspects, further comprising: a passivation layer disposed on the thin film transistor and on which the bank is formed; an electrode formed on the passivation layer; and an organic layer formed on at least a portion of each of the electrode and the bank. 24. The display device of any one of the preceding aspects, wherein the display device includes a folded area and a flat area, and the spacer structure assembly is disposed in the folded area and / or at least a portion of the flat area. 25. A manufacturing method of a display device comprising: disposing a thin film transistor on a substrate; disposing a bank on the thin film transistor; disposing a photoresist on the bank; and performing photolithography for the photoresist by using a mask corresponding to the shape of a spacer structure assembly comprising a pair of spacers having separation distance that changes along the length of the spacers; wherein the display device is a foldable device having a folded area. 26. The manufacturing method of aspect 25, wherein a photoresist of a negative type is used as the photoresist. 27. The manufacturing method of aspect 25 or aspect 26, wherein each of the at least two spacers is formed in a row having a change in a width. 28. The manufacturing method of any one of aspects 25 to 26, wherein a separation distance between the at least two spacers is set to be inversely proportional to a width of one surface of the at least two spacers. 29. The manufacturing method of aspect 25, wherein a height of each of the at least two spacers at a first position along the length of the spacers is set to be equal to a height of each of the at least two spacers at a second position along the length of the spacers. 30. The manufacturing method of aspect 25, wherein the at least two spacers are formed to comprise a first spacer and a second spacer, and a distance between one end of the first spacer and one end of the bank is set to be equal to a distance between one end of the second spacer and the other end of the bank. 31. The manufacturing method of aspect 25, wherein each of the at least two spacers is formed to have an inverse tapered shape. 32. The manufacturing method of aspect 25, wherein an exposure amount for forming the at least two spacers is set to be inversely proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers. 33. The manufacturing method of aspect 25, wherein a height of the at least two spacers is set to be proportional to a separation distance between the at least two spacers or a taper angle of one of the at least two spacers . Below follow a list of numbered articles. These articles may be combined with any other features described herein in any combination beyond those expressly stated below: 1. A display device comprising: a substrate; a thin film transistor disposed on the substrate; a bank disposed on the thin film transistor; a plurality of organic luminous elements disposed on the substrate; and a first spacer and a second spacer on the bank between two adjacent organic luminous elements of the plurality of organic luminous elements, wherein each of the first spacer and the second spacer has an inverse tapered shape. 2. The display device of article 1, wherein a width of the upper surface of each of the first spacer and the second spacer is greater than a width of the lower surface of each of the first spacer and the second spacer. 3. The display device of any one of the preceding articles, further comprising: an organic layer disposed on the bank between the first spacer and the second spacer. 4. The display device of article 3, wherein the organic layer overlaps all of the bank layer between the first and second spacers. 5. The display device of article 3 or article 4, wherein between the first and second spacers, the organic layer slopes towards opposing inside edges of the lower surface of each of the first and second spacers. 6. The display device of article 4 or article 5, wherein the height of the organic layer reduces to zero at the opposing inside edges of the lower surfaces of the first and second spacers. 7. The display device of any one of articles 3 -6, wherein the organic layer is disposed on the bank either side of the first and second spacers, and slopes towards outside edges of the lower surfaces of the first and second spacers . 8. The display device of article 1, wherein each of the plurality of organic luminous elements comprises: an anode disposed on the substrate; an organic layer disposed on the anode; and a cathode disposed on the organic layer. 9. The display device of article 8, wherein the anode is disposed to overlap at least a portion of the bank. 10. The display device of any one of the preceding articles, wherein the thin film transistor includes an amorphous silicon or a low-temperature polycrystalline silicon. 11. The display device of any one of the preceding articles, further comprising: a cover layer covering the plurality of organic luminous elements, the first spacer and the second spacer. 12. The display device of any one of the preceding articles, wherein the substrate includes a folded area; and the first spacer and the second spacer are disposed in the folded area. 13.     The display device of article 12, wherein the substrate further incudes a flat area, and wherein the plurality of first and second spacers are disposed in the flat and folded portions. 14. The display device of article 12 or article 13, wherein the first spacer and the second spacer are disposed non-parallel to a substrate folding axis. 15. The display device of any one of the preceding articles, wherein a width of the upper surface of each of the first spacer and the second spacer is greater than a width of the lower surface of each of the first spacer and the second spacer. 16. The display device of any one of the preceding articles, further comprising: an organic layer disposed the bank between the first spacer and the second spacer. 17. The display device organic layer overlaps all of first and second spacers. 18. The display device of article 16, wherein the the bank layer between the of article 16 or article 17, wherein between the first and second spacers, the organic layer slopes towards opposing inside edges of the lower surface of each of the first and second spacers. 19. The display device of any one of articles 16-18, wherein the height of the organic layer reduces to zero at the opposing inside edges of the lower surfaces of the first and second spacers. 20. The display device of any one of articles 16 -19, wherein the organic layer is disposed on the bank either side of the first and second spacers, and slopes towards outside edges of the lower surfaces of the first and second spacers . 21. The display device of any one of articles 12-20, wherein each of the plurality of organic luminous elements comprising: an anode disposed on the substrate; an organic layer disposed on the anode; and a cathode disposed on the organic layer. 22. The display device of article 21, wherein the anode is disposed to overlap at least a portion of the bank. 5 23. The display device of any one of articles 12-22, wherein the thin film transistor includes an amorphous silicon or a low-temperature polycrystalline silicon. 10     24. The display device of any one of articles 12-23, further comprising: a cover layer covering the plurality of organic luminous elements, the first spacer and the second spacer. 15

Claims

1. A display device comprising:a substrate including a folded area;a thin film transistor disposed on the substrate;a bank disposed on the thin film transistor;a plurality of organic luminous elements disposed on the substrate; anda first spacer and a second spacer disposed in the folded area, in two rows in parallel on the bank between two adjacent organic luminous elements of the plurality of organic luminous elements;wherein each of the first spacer and the second spacer has an inverse tapered shape; and further comprisingan organic layer disposed on the bank between the first and second spacers.

2. The display device of claim 1, wherein the substrate further incudes a flat area, the first spacer and a second spacer are a pair of first and second spacers of a plurality of first and second spacers, and in which the plurality of first and second spacers are disposed in the flat and folded portions.

3. The display device of claim 1 or claim 2, wherein the first spacer and the second spacer are disposed non-parallel to a substrate folding axis.

4. The display device of any one of claims 1-2, wherein the first spacer and the second spacer are a pair of first and second spacers of a plurality of first and second spacer pairs, wherein each of the plurality of organic luminous elements is surrounded one each of its sides by one of the plurality of first and second spacer pairs.

5. The display device of any one of the preceding claims, wherein a width of the upper surface of each of the first spacer and the second spacer is greater than a width of the lower surface of each of the first spacer and the second spacer.

6. The display device of any one of the preceding claims, wherein the organic layer overlaps all of the bank layer between the first and second spacers.

7. The display device of any one of the preceding claims, wherein between the first and second spacers, the organic layer slopes towards opposing inside edges of the lower surface of each of the first and second spacers.

8. The display device of any one of claims 1-7, wherein the organic layer is disposed on the bank either side of the first and second spacers, and slopes towards outside edges of the lower surfaces of the first and second spacers.

9. The display device of any one of claims 1-8, wherein each of the plurality of organic luminous elements comprising:an anode disposed on the substrate;an organic layer disposed on the anode; anda cathode disposed on the organic layer.

10. The display device of claim 9, wherein the anode is disposed to overlap at least a portion of the bank.

11. The display device of any one of claims 1-10, wherein the thin film transistor includes an amorphous silicon or a low-temperature polycrystalline silicon.

12. The display device of any one of claims 1-11, further comprising:a cover layer covering the plurality of organic luminous elements, the first spacer and the second spacer.

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