US-12622106-B2 - Light emitting display apparatus and method of manufacturing the same

US12622106B2US 12622106 B2US12622106 B2US 12622106B2US-12622106-B2

Abstract

A light emitting display apparatus in which a charge generating layer is separated between pixels, and a method using the same are discussed. The light emitting display apparatus can include a first anode and a second anode provided on a substrate, a bank provided on the first anode and the second anode and including at least one opening portion at which the first anode and the second anode are exposed, a first light emitting unit including a first main light emitting unit provided on the first anode, a first charge generating layer provided in an upper surface of the first main light emitting unit and in an upper surface of a bank exposed between the first anode and the second anode, an additional light emitting layer covering the first charge generating layer, and a cathode covering the additional light emitting layer.

Inventors

YoungHoon SON

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20230328
Priority Date: 20220329

Claims (17)

1 . A light emitting display apparatus comprising: a first anode and a second anode provided on a substrate, the first anode provided in a first pixel and the second anode provided in a second pixel; a bank provided on the first anode and the second anode, and including at least one opening portion at which the first anode and the second anode are exposed: a first light emitting unit including a first main light emitting unit provided on the first anode; a first charge generating layer provided in an upper surface of the first main light emitting unit and in an upper surface of the bank exposed between the first anode and the second anode; an additional light emitting layer covering the first charge generating layer; and a cathode covering the additional light emitting layer, wherein the first charge generating layer comprises: a first main charge generating layer provided in an upper surface of the first main light emitting unit; and a first sub charge generating layer provided in an upper surface of the bank, and wherein the first main charge generating layer is separated from the first sub charge generating layer at an end area of the first main light emitting unit.
2 . The light emitting display apparatus of claim 1 , wherein the end area of the first main light emitting unit protrudes toward an upward direction of the first main light emitting unit.
3 . The light emitting display apparatus of claim 1 , wherein the first main light emitting unit is separated from another first main light emitting unit provided on the second anode in the second pixel.
4 . The light emitting display apparatus of claim 1 , wherein the end area of the first main light emitting unit is inclined in an outer direction of the first main light emitting unit.
5 . The light emitting display apparatus of claim 1 , wherein the additional light emitting layer comprises a second light emitting unit, and the second light emitting unit comprises: a second main light emitting unit provided on the first main charge generating layer; and a second sub light emitting unit provided on the first sub charge generating layer.
6 . The light emitting display apparatus of claim 5 , wherein the additional light emitting layer further comprises: a second charge generating layer provided on the second light emitting unit; and a third light emitting unit provided on the second charge generating layer.
7 . The light emitting display apparatus of claim 6 , wherein the second charge generating layer is separated at the end area of the first main light emitting unit.
8 . The light emitting display apparatus of claim 6 , wherein the second charge generating layer comprises: a second main charge generating layer provided on the second main light emitting unit; and a second sub charge generating layer provided on the second sub light emitting unit.
9 . The light emitting display apparatus of claim 8 , wherein the second main charge generating layer and the second sub charge generating layer are separated from each other at the end area of the first main light emitting unit.
10 . The light emitting display apparatus of claim 8 , wherein the third light emitting unit comprises: a third main light emitting unit provided on the second main charge generating layer; and a third sub light emitting unit provided on the second sub charge generating layer.
11 . The light emitting display apparatus of claim 1 , wherein the cathode is continuously provided between the first pixel and the second pixel.
12 . The light emitting display apparatus of claim 1 , wherein white light is output from the first light emitting unit, the first charge generating layer, and the additional light emitting layer.
13 . The light emitting display apparatus of claim 1 , wherein the additional light emitting layer comprises at least three layers, and at least one of the at least three layers is separated at the end area of the first main light emitting unit.
14 . The light emitting display apparatus of claim 5 , wherein the second light emitting unit comprises at least three layers, and at least one of the at least three layers is continuously provided at the end area of the first main light emitting unit.
15 . The light emitting display apparatus of claim 1 , wherein each of at least two charge generating layers included in the additional light emitting layer is separated at the end area of the first main light emitting unit.
16 . The light emitting display apparatus of claim 1 , wherein one of at least two light emitting units included in the additional light emitting layer is continuously provided at the end area of the first main light emitting unit.
17 . The light emitting display apparatus of claim 16 , wherein a light emitting unit continuously provided among the at least two light emitting units is provided in an upper end of the additional light emitting layer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to the Korean Patent Application No. 10-2022-0039021 filed on Mar. 29, 2022 in the Republic of Korea and the Korean Patent Application No. 10-2022-0073994 filed on Jun. 17, 2022 in the Republic of Korea, the entire contents of all these applications being hereby expressly incorporated by reference into the present application. BACKGROUND Field of the Invention The present disclosure relates to a light emitting display apparatus and a method of manufacturing the same. Discussion of the Related Art A light emitting display apparatus is a display apparatus, which emits light by using a light emitting device, and includes a light emitting display panel including light emitting devices. As a resolution of the light emitting display panel increases progressively, undesired light can be emitted due to a leakage current between adjacent pixels. The emission of undesired light which may be caused by a leakage current between adjacent pixels can occur due to a light emitting layer continuously provided in adjacent pixels. Particularly, in a light emitting display panel which includes light emitting devices including a plurality of emission units, a leakage current can be generated by a charge generating layer CGL continuously provided in adjacent pixels. SUMMARY OF THE DISCLOSURE Accordingly, the present disclosure is directed to providing a light emitting display apparatus and method of manufacturing the same that substantially obviates one or more problems due to limitations and disadvantages of the related art. An aspect of the present disclosure is directed to providing a light emitting display apparatus, in which charge generating layer is separated between pixels, and a method using the same. Additional advantages and features of the disclosure 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 can be learned from practice of the disclosure. The objectives and other advantages of the disclosure can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. To achieve these and other advantages and in accordance with the purpose of the disclosure, as embodied and broadly described herein, there is provided a light emitting display apparatus including a first anode and a second anode provided on a substrate, the first anode provided in a first pixel and the second anode provided in a second pixel, a bank provided on the first anode and the second anode, and including at least one opening portion at which the first anode and the second anode are exposed, a first light emitting unit including a first main light emitting unit provided on the first anode, a first charge generating layer provided in an upper surface of the first main light emitting unit and in an upper surface of a bank exposed between the first anode and the second anode, an additional light emitting layer covering the first charge generating layer, and a cathode covering the additional light emitting layer, wherein the first charge generating layer comprises a first main charge generating layer provided in an upper surface of the first main light emitting unit and a first sub charge generating layer provided in an upper surface of the bank, and the first main charge generating layer is separated from the first sub charge generating layer at an end of the first main light emitting unit. In another aspect of the present disclosure, there is provided a method of manufacturing a light emitting display apparatus, the method including patterning anodes in pixels, forming a bank including at least one opening portion, at which the anodes are exposed, on the anodes, forming a shield layer between the pixels, depositing a first light emitting unit material on an entire surface of a substrate, forming a first main light emitting unit including the first light emitting unit material in the pixels by removing the shield layer, depositing a first charge generating layer on an entire surface of the substrate, depositing an additional light emitting layer on an entire surface of the substrate, and depositing a cathode on an entire surface of the substrate, wherein the first main light emitting units are separated from each other, a first light emitting unit comprises the first main light emitting units, and the first charge generating layer is separated at each of both ends of the first main light emitting unit. It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the disclosure and are inc