# US 10,374,199 B2 · Display device and manufacturing method thereof

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- Number: US 10,374,199 B2
- Document ID: US10374199B2
- Status: Granted
- Kind: B2
- Application number: 15/788,845
- Filed: 2017-10-20
- Published: 2018-05-03
- Granted: 2019-08-06
- Earliest claimed: 2016-10-27
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Shiro Sumita
- Web page: https://patentgrep.com/patent/US10374199B2

## CPC

- H10P 74/273: {Interconnections for measuring or testing, e.g. probe pads}
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 59/88: Dummy elements, i.e. elements having non-functional features
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 71/70: Testing, e.g. accelerated lifetime tests
- H10P 74/23: {characterised by multiple measurements, corrections, marking or sorting processes}
- H10K 59/873: {Encapsulations}
- H10P 74/207: {Electrical properties, e.g. testing or measuring of resistance, deep levels or capacitance-voltage characteristics}
- H10P: GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device includes: a pixel electrode formed in a display area; an organic layer formed on the pixel electrode and including a light emitting layer; a counter electrode formed on the organic layer; a sealing layer formed on the counter electrode; a drive circuit formed in a picture-frame area as an area outside the display area and controlling light emission of the light emitting layer; a first test electrode formed in the picture-frame area and electrically separated from the drive circuit; and a picture-frame insulating layer formed on the first test electrode.

## Claims

### Claim 1

A display device comprising:
a substrate including a display area including a plurality of pixel electrodes arranged therein, the substrate including a picture-frame area outside the display area;
a wiring pattern including terminals arranged in the picture-frame area;
an organic layer formed on the pixel electrodes and including a light emitting layer;
a counter electrode formed on the organic layer;
a sealing layer formed on the counter electrode;
a drive circuit formed in the picture-frame area for controlling light emission of the light emitting layer;
a first test electrode formed in the picture-frame area and electrically separated from the drive circuit;
a second test electrode formed in the picture-frame area electrically separated from the drive circuit and the first test electrode; and
a picture-frame insulating layer formed on the wiring pattern and including openings to expose the respective terminals, the picture-frame insulating layer formed entirely on and in direct contact with an upper surface of the first test electrode, the picture-frame insulating layer formed entirely below and in direct contact with a lower surface of the second test electrode,
wherein the first test electrode and the second test electrode are displaced from each other so as not to be overlapped in a plan view, and
the first test electrode and the second test electrode are adjacent to at least one of the terminals in the plan view.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein
the picture-frame insulating layer is formed in the same layer as an insulating layer formed below the pixel electrodes.

### Claim 3 (depends on 1)

The display device according to claim 1, further comprising:
a flexible printed board connected to some of the terminals, wherein
the terminals are located in a layer that is below the picture-frame insulating layer and in the same layer as the first test electrode, and include a conductive layer exposed from the picture-frame insulating layer.