CN-122003053-A - Light-emitting display device

Abstract

A light emitting display device is disclosed. The light emitting display device includes a substrate including a plurality of sub-pixels, a first electrode at each of the plurality of sub-pixels, a bank exposing the first electrode at each of the light emitting portions of the plurality of sub-pixels, a first spacer structure on the bank, a second spacer structure spaced apart from the first spacer structure on the bank, a common layer on the first electrode, the bank, the first spacer structure, and the second spacer structure, and a second electrode on the common layer, wherein the second electrode is disposed on at least one side surface of the common layer above the first spacer structure and on at least one side portion of the first spacer structure, the first spacer structure includes a pattern surrounding each of the sub-pixels, and the pattern includes at least one opening area therein, the first spacer structure further includes an extension to connect the pattern surrounding adjacent sub-pixels between the adjacent sub-pixels, and the second spacer structure is adjacent to the at least one opening area.

Inventors

• XU SHENGHAO
• LI ZHONGXUN
• LI DONGXUAN
• ZHANG DONGMIN

Assignees

• 乐金显示有限公司

Dates

Publication Date

20260508

Application Date

20210622

Priority Date

20200626

Claims (20)

1. 1. A light emitting display device comprising: A substrate including a plurality of sub-pixels; a first electrode at each of the plurality of sub-pixels; a bank exposing the first electrode at each light emitting portion of the plurality of sub-pixels; a first spacer structure on the dykes; a second spacer structure on the dykes spaced apart from the first spacer structure; A common layer over the first electrode, the dykes, the first spacer structure and the second spacer structure, and A second electrode on the common layer, Wherein the second electrode is disposed on at least one side surface of the common layer above the first spacer structure and at least one side of the first spacer structure, Wherein the first spacer structure comprises a pattern surrounding each of the plurality of sub-pixels and wherein the pattern comprises at least one open area, Wherein the first spacer structure further comprises an extension to connect the pattern around adjacent sub-pixels between adjacent sub-pixels, and Wherein the second spacer structure is adjacent to the at least one opening region.
2. 2. The light-emitting display device according to claim 1, Wherein the plurality of sub-pixels includes a plurality of first sub-pixels for emitting a first color, a plurality of second sub-pixels for emitting a second color having a wavelength longer than that of the first color, and a plurality of third sub-pixels for emitting a third color between the wavelength of the first color and the wavelength of the second color, and Wherein the extension is at least disposed between the third sub-pixels.
3. 3. The light emitting display device of claim 2, wherein the second spacer structure is disposed between adjacent third sub-pixels.
4. 4. The light-emitting display device according to claim 2, wherein the pattern of the first spacer structure is provided at least with respect to the plurality of third sub-pixels, and the pattern surrounds all sides of light-emitting portions of the plurality of third sub-pixels.
5. 5. The light emitting display device of claim 1, wherein the plurality of sub-pixels includes first, second, and third sub-pixels for emitting different colors, and Wherein the pattern of the first spacer structure comprises a first pattern surrounding the first sub-pixel, a second pattern surrounding the second sub-pixel, and a third pattern surrounding the third sub-pixel, and Wherein each of the first pattern, the second pattern, and the third pattern has at least one opening area.
6. 6. The light emitting display device of claim 5, wherein the extension extends from the third pattern and the extension is parallel to the first pattern between the first and second sub-pixels.
7. 7. The light emitting display device of claim 6, wherein the extension is disposed between the first pattern and the second pattern.
8. 8. The light emitting display device of claim 5, wherein the at least one open area of the first pattern and the at least one open area of the second pattern are positioned along a first direction.
9. 9. The light emitting display device of claim 1, wherein a width of the second spacer structure is greater than a width of the first spacer structure and a height of the second spacer structure is greater than a height of the first spacer structure.
10. 10. The light emitting display device of claim 1, wherein the first spacer structure and the second spacer comprise different materials.
11. 11. The light-emitting display device according to claim 1, wherein, in a cross-sectional view, the first spacer structure decreases in width in a direction toward the substrate, and the second spacer structure widens in width in the direction toward the substrate.
12. 12. The light-emitting display device according to claim 1, Wherein the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel for emitting different colors, and Wherein each light emitting portion of the first, second, and third sub-pixels is polygonal.
13. 13. The light-emitting display device according to claim 12, wherein the light-emitting portions of the first sub-pixel, the second sub-pixel, and the third sub-pixel each have a different shape.
14. 14. The light emitting display device of claim 1, further comprising an encapsulation layer on the second electrode, Wherein the thickness of the encapsulation layer on the at least one side of the first spacer structure is thinner than the thickness of the encapsulation layer on the upper surface of the first spacer structure.
15. 15. The light emitting display device of claim 1, wherein the first electrode partially overlaps the second spacer structure.
16. 16. The light emitting display device of claim 2, wherein: The first subpixel has a first light emitting layer to contact the common layer between the first electrode and the second electrode to emit light having the first color; the second sub-pixel having a second light emitting layer to contact the common layer between the first electrode and the second electrode to emit light having the second color, and The third subpixel has a third light emitting layer to contact the common layer between the first electrode and the second electrode to emit light having the third color.
17. 17. The light emitting display device of claim 12, wherein a width of the first spacer structure is smaller than a width of a smallest light emitting portion among light emitting portions of the first, second, and third sub-pixels.
18. 18. The light-emitting display device according to claim 1, wherein the common layer comprises at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a charge generation layer.
19. 19. The light-emitting display device according to claim 12, wherein a threshold voltage of the first subpixel is highest among the first subpixel, the second subpixel, and the third subpixel.
20. 20. The light emitting display device of claim 12, wherein: the first sub-pixels and the second sub-pixels are alternately arranged in rows and columns, and The third sub-pixel is arranged to alternate with each of the first sub-pixel and the second sub-pixel in a diagonal direction.

Description

Light-emitting display device The application is a divisional application of patent application No. 202110692440.8 with the name of 'luminous display device' of 2021, 6 and 22. The present application claims the benefit of korean patent application No. 10-2020-007845, filed on 26 months 6 in 2020, which is hereby incorporated by reference as if fully set forth herein. Technical Field The present invention relates to a light emitting display device, and more particularly, to a light emitting display device that can prevent lateral leakage current between adjacent sub-pixels using a structure provided on a bank. Background Recently, display devices have been developed into various types to meet requirements such as flexibility, miniaturization, maximization, and the like. Among these display devices, a light emitting display device including a light emitting device, which is respectively provided in a plurality of pixels or sub-pixels provided on a substrate, and thereby omitting an external light source to achieve slimness is considered as a competitive application. The light emitting display device includes a plurality of layers in each of the light emitting devices, and in this case, in order to avoid the use of a fine metal mask, the light emitting display device has a common layer commonly formed in each pixel or sub-pixel. Due to the common layer commonly provided in the pixels or sub-pixels, current may flow to neighboring pixels or sub-pixels through the two-dimensionally extending common layer. Such currents are referred to as lateral leakage currents. Disclosure of Invention Accordingly, the present invention relates to a light emitting display device that can prevent lateral leakage current using a structure provided on a bank. An object of the present invention is to provide a light emitting display device that can define a structure for dividing a common layer into regions corresponding to sub-pixels using a structure provided on a bank without using a separate mask, and thus can prevent lateral leakage current between adjacent sub-pixels. Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings. To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a light emitting display device includes a substrate including a plurality of first to third sub-pixels arranged adjacent to each other, each of the first to third sub-pixels including a light emitting portion and a non-light emitting portion configured to surround the light emitting portion, first electrodes covered by a bank and respectively disposed in the first to third sub-pixels to expose the corresponding light emitting portion, a first spacer structure having an inverted cone shape on at least one side of each of the light emitting portions configured to surround the first to third sub-pixels on the bank, a common layer structure on the first electrodes and the first spacer structure and being disconnected at edges of the first spacer structure, and a second electrode on the common layer structure. In another aspect of the present invention, a light emitting display device includes a substrate including a plurality of light emitting parts and a non-light emitting part between the light emitting parts, first electrodes respectively disposed in the light emitting parts, a bank configured to selectively overlap the first electrodes and disposed in the non-light emitting parts, a first spacer structure having an inverted cone shape between adjacent light emitting parts on the bank, the first spacer structure configured to have an opening region formed in a virtual closed loop configured to surround at least one of the light emitting parts and at least one side of each of the light emitting parts, a common layer structure located on the first electrodes and the first spacer structure and being opened at an edge of the first spacer structure, and a second electrode located on the common layer structure. In another aspect of the invention, a light emitting display device includes a substrate including a plurality of sub-pixels, a first electrode at each of the plurality of sub-pixels, a bank exposing the first electrode at each of the plurality of sub-pixels, a first spacer structure on the bank, a second spacer structure on the bank spaced apart from the first spacer structure, a common layer on the first electrode, the bank, the first spacer structure, and the second spacer structure, and a second electrode on the common layer, wherein the seco