Optical inspection device for optical performance test of display device and optical inspection method using the same

Patent metadata

Field	Value
Publication number	US-12372479-B2
Application number	US-202418732934-A
Country	US
Kind code	B2
Filing date	Jun 4, 2024
Priority date	Aug 20, 2020
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

An optical inspection device for an optical performance test of a display device including a lens part configured to transmit external light, a phase film part configured to change a phase difference of the external light and transmit the external light, and an image processor configured to obtain electrical information of the external light, in which a phase difference of the phase film part is at least 7000 nm.

First claim

What is claimed is:

1. An optical inspection method, comprising:
preparing a display device and an optical inspection device;
locating the optical inspection device on a front surface of the display device; and
acquiring, by the optical inspection device, information on light emitted from the display device,
wherein:
the display device has a display area and includes a light emitting element configured to emit light in the display area;
the optical inspection device has an optical path through which light provided from the outside is transmitted to acquire information of the light, the optical inspection device including a phase film part configured to change a phase difference of light provided thereto; and
the phase film part has a phase difference of at least 7000 nm.

2. The optical inspection method of claim 1 , wherein the phase film part has a phase difference of at least 8000 nm.

3. The optical inspection method of claim 1 , wherein the display device includes a polarizing film including a first absorption axis and a first transmission axis orthogonal to the first absorption axis, and light provided from the display device has a first polarizing axis, and
wherein a first angle defined between the first polarizing axis and one of the first absorption axis and the first transmission axis is in a range of 45 degrees to 65 degrees.

4. The optical inspection method of claim 3 , wherein the phase film part has a first optical axis, and an angle defined between first optical axis and one of the first absorption axis and the first transmission axis is in a range of 25 degrees to 65 degrees.

5. The optical inspection method of claim 3 , wherein the optical inspection device further includes:
a light receiving part configured to receive light provided thereto, and including a polarizer having a second polarizing axis; and
a polarizing part disposed on the optical path, and including a second absorption axis and a second transmission axis orthogonal to the second absorption axis.

6. The optical inspection method of claim 5 , wherein a second angle defined between the second transmission axis and one of the second absorption axis and the second transmission axis is in a range of 25 degrees to 65 degrees.

7. The optical inspection method of claim 5 , wherein locating the optical inspection device on the front surface of the display device includes arranging the optical inspection device to have the first absorption axis in parallel to the second absorption axis.

8. The optical inspection method of claim 5 , wherein the optical inspection device further includes a phase retardation part disposed on the optical path to retard a phase of light provided thereto.

9. The optical inspection method of claim 8 , wherein the phase retardation part comprises a λ/4 phase retardation layer.

10. The optical inspection method of claim 9 , wherein the phase retardation part has a second optical axis, and an angle defined between the second optical axis and one of the second absorption axis and the second transmission axis is in a range of 25 degrees to 65 degrees.

11. The optical inspection method of claim 9 , wherein the phase retardation part has a second optical axis, and an angle defined between the second optical axis and one of the first absorption axis and the first transmission axis is in a range of 25 degrees to 65 degrees.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Gil Yeong
• Jung Min Kyoung
• Lee Hee Young

Classifications

• G01M11/02 Primary

  Testing optical properties · CPC title

• G01N2021/9513

  Liquid crystal panels · CPC title

• G01N2021/8848

  Polarisation of light · CPC title

• G01N2021/218

  Measuring properties of electrooptical or magnetooptical media · CPC title

• G02F1/1309 Primary

  Repairing; Testing · CPC title