Display device and optical inspection method for the same

Patent metadata

Field	Value
Publication number	US-11963394-B2
Application number	US-202318369313-A
Country	US
Kind code	B2
Filing date	Sep 18, 2023
Priority date	Sep 8, 2020
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

A display device includes: a substrate; a display element layer disposed on the substrate, where the display element layer includes a light emitting element which emits light; a polarizing film disposed on the display element layer, where the polarizing film includes a first polarizer having a first absorption axis extending to a first direction and a first transmission axis extending to a second direction orthogonal to the first direction; and a first layer disposed on one surface of the polarizing film, where the first layer has a first phase difference. Light emitted from the display element layer has a polarizing axis, and an angle between the polarizing axis and one of the first absorption axis and the first transmission axis is in a range of about 25 degrees to about 65 degrees.

First claim

What is claimed is:

1. An optical inspection method comprising:
preparing a display device including a light emitting element which emits light, wherein the display device outputs the light in a display direction;
preparing an optical inspection device which receives the light output from the display device;
locating the optical inspection device on a front surface of the display device; and
acquiring optical information of the display device, based on the light provided from the display device,
wherein the optical inspection device includes:
a main body including a light receiving part which receives light provided thereto, wherein the light receiving part includes a polarizer having a predetermined polarizing axis, and an image processor which acquires electrical information, based on the light provided to the light receiving part;
a lens part which receives light provided from an outside, wherein the lens part provides the light provided from the outside to the light receiving part; and
a phase film part having a phase difference of about 4000 nm,
wherein the optical inspection device includes a polarizing part having an absorption axis and a transmission axis, and
wherein an angle between the predetermined polarizing axis of the polarizer and one of the absorption axis and the transmission axis is in a range of about 25 degrees to about 65 degrees.

2. The optical inspection method of claim 1 , wherein the locating the optical inspection device on the front surface of the display device comprises locating the optical inspection device at the front of the display device in a way such that a reference display line of the display device and a reference light receiving line of the optical inspection device form an angle of about 45 degrees, and
wherein the reference display line is perpendicular to a display surface of the display device, and
the reference light receiving line is perpendicular to a main surface of the optical inspection device.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Hee Young
• Seo Eun Mi
• Park Gil Yeong
• Oh Min Ju

Classifications

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K50/86 Primary

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• G01J1/0429 Primary

  using polarisation elements · CPC title

• H10K50/85

  Arrangements for extracting light from the devices · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title