ORGANIC EL DISPLAY DEVICE

• US 20150060822A1
• Filed: 08/28/2014
• Published: 03/05/2015
• Est. Priority Date: 08/30/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: KAMIYA, Akinori, SATO, Toshihiro
• Granted Patent: US 9,419,245 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/80521 characterised by their shape
• CPC Class Codes: H10K 59/873 Encapsulations

Abstract

In an organic EL display device configured in which an acrylic resin layer is disposed under a barrier layer that protects an OLED for flattening the barrier layer, floating the barrier layer caused by penetration of moisture into the acrylic resin can be prevented. A side surface of a bank formed in a boundary of pixels is formed into a cliff part having an inclination angle of 90° or larger in most portions of a circumstance of each pixel part, and formed into a gently sloped part having the inclination angle smaller than 90° in a part of the circumference. The electrode parts disposed within the respective pixels are connected to each other through an electrode part disposed on an upper surface of the bank, and electrode parts disposed on the gently sloped parts to form an OLED common electrode.

Claims

1. An organic EL display device in which a plurality of pixels each including an organic light emitting element having an organic material laminated between a lower electrode and an upper electrode is arrayed in a display area, the organic EL display device, comprising:

cliff-like banks that are formed along boundaries of the pixels, and each have a side surface whose inclination angle is 90°

or larger; and

a sealing layer that includes two sealing films made of silicon compound and a flattening resin sandwiched between the sealing films, is laminated in the display area having the bank formed, and covers the organic light emitting elements, wherein

the side surface of each bank is formed with a forward tapered slope face having the inclination angle smaller than 90°

in a part of a circumference of each pixel, and

the upper electrode is a common electrode that includes an in-pixel electrode part laminated within each pixel, a pixel boundary electrode part laminated on an upper surface of the bank, and a slope electrode part which is laminated on the forward tapered slope face and is connecting the in-pixel electrode part and the pixel boundary electrode part, and the respective in-pixel electrode parts are connected to each other through the slope electrode part and the pixel boundary electrode part.

2. The organic EL display device according to claim 1,

wherein the in-pixel electrode part and the pixel boundary electrode part are divided on a side surface of the cliff-like portion of the bank.

3. The organic EL display device according to claim 1,

wherein the forward tapered slope face is formed on both side surfaces of a part of the bank between the adjacent pixels.

4. The organic EL display device according to claim 3, wherein

the cliff-like portion of the bank includes a first bank layer and a second bank layer laminated on the first bank layer,

the second bank layer is made of a material different from that of the first bank layer, and protrudes laterally from the first bank layer, and

a portion of the bank in which the forward tapered slope faces of the bank are formed on both side surfaces thereof includes a third bank layer formed separately from the first and second bank layers.

5. The organic EL display device according to claim 1, wherein

the sealing film is made of silicon compound, and

the flattening resin includes a resin obtained by polymerizing organic monomer having fluidity adhered onto the lower sealing film.