Resolution measurement apparatus and resolution measurement method using the same

Patent metadata

Field	Value
Publication number	US-12072259-B2
Application number	US-202117367785-A
Country	US
Kind code	B2
Filing date	Jul 6, 2021
Priority date	Sep 2, 2020
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

A resolution measurement apparatus includes a stage configured to receive a display module including an optical part. The stage includes an opening that overlaps the optical part, when viewed in a plan view, when the display module is disposed on the stage. The resolution measuring apparatus further includes a plurality of cameras disposed above the stage, a light source disposed under the stage and overlapping the opening when viewed in the plan view, and a lens disposed between the light source and the stage. The lens overlaps the opening when viewed in the plan view, and the optical part overlaps the lens, when viewed in the plan view, when the display module is disposed on the stage.

First claim

What is claimed is:

1. A resolution measurement apparatus, comprising:
a stage configured to receive a display module, wherein the display module comprises an optical part,
wherein the stage comprises an opening that overlaps the optical part, when viewed in a plan view, when the display module is disposed on the stage;
a plurality of cameras disposed above the stage, and disposed above the display module when the display module is disposed on the stage,
wherein the plurality of cameras are separate and distinct from the display module;
a light source disposed under the stage,
wherein the light source overlaps the opening when viewed in the plan view; and
a lens disposed between the light source and the stage,
wherein the lens overlaps the opening when viewed in the plan view,
wherein the optical part overlaps the lens, when viewed in the plan view, when the display module is disposed on the stage; and
a controller configured to measure a resolution of the optical part by using information captured through the cameras.

2. The resolution measurement apparatus of claim 1 , wherein when viewed in the plan view, a central portion of the optical part overlaps a central portion of the lens.

3. The resolution measurement apparatus of claim 2 , wherein
the stage has a plane defined by a first direction and a second direction crossing the first direction,
wherein the resolution measurement apparatus further comprises a movement part configured to move the stage in the first direction and the second direction, and the central portion of the optical part overlaps the central portion of the lens in response to the stage moving in at least one of the first and second directions.

4. The resolution measurement apparatus of claim 3 , wherein
the optical part is one of a plurality of optical parts, and
the central portions of the plurality of optical parts sequentially overlap the central portion of the lens in response to the stage moving in at least one of the first and second directions.

5. The resolution measurement apparatus of claim 1 , wherein lenses of the cameras face the optical part.

6. The resolution measurement apparatus of claim 5 , wherein the cameras are arranged along an angle of view defined by the optical part.

7. The resolution measurement apparatus of claim 1 , further comprising:
a camera housing having a fan shape extending between a lower portion of the camera housing and an upper portion of the camera housing, disposed above the stage, and configured to accommodate the cameras,
wherein an upper surface of the camera housing is curved, and the cameras are disposed along the upper surface of the camera housing.

8. The resolution measurement apparatus of claim 7 , wherein
a lower surface of the camera housing is open toward the optical part, and
when viewed in the plan view, the lens overlaps the lower surface of the camera housing.

9. The resolution measurement apparatus of claim 1 , further comprising:
a lens housing configured to accommodate the lens and the light source,
wherein the lens is fixed to an upper end of the lens housing, and the light source is disposed under the lens in the lens housing.

10. The resolution measurement apparatus of claim 1 , wherein the stage comprises a recess defined in an upper surface of the stage, the opening is disposed in the recess, and recess is configured to receive the display module.

11. A resolution measurement method, comprising:
disposing a display module on a stage,
wherein an optical part of the display module overlaps an opening of the stage when viewed in a plan view;
overlapping the optical part with a lens disposed under the stage;
generating a light from a light source disposed under the lens;
providing the light to a plurality of cameras disposed above the stage through the lens and the optical part,
wherein the plurality of cameras are disposed above the display module when the display module is disposed on the stage,
wherein the plurality of cameras are separate and distinct from the display module; and
measuring a resolution of the optical part by using information captured through the cameras.

12. The resolution measurement method of claim 11 , wherein overlapping the optical part with the lens comprises moving the stage, and a central portion of the optical part overlaps a central portion of the lens in response to moving the stage.

13. The resolution measurement method of claim 11 , further comprising:
sequentially overlapping central portions of a plurality of optical parts with a central portion of the lens,
wherein the optical part is one of the plurality of optical parts;
providing the light to the cameras through the lens and the optical parts when the optical parts overlap the lens; and
sequentially measuring resolutions of the optical parts.

14. The resolution measurement method of claim 11 , wherein
the cameras are arranged along an angle of view defined by the optical part, and
lenses of the cameras face the optical part.

15. The resolution measurement method of claim 11 , wherein
a camera housing configured to accommodate the cameras has a fan shape and is disposed above the stage, and
an upper surface of the camera housing is curved, and the cameras are disposed along the upper surface of the camera housing.

16. The resolution measurement method of claim 15 , further comprising:
disposing a lower surface of the camera housing above the optical part,
wherein the lower surface of the camera housing is open toward the optical part, and the lens overlaps the lower surface of the camera housing when viewed in the plan view.

17. The resolution measurement method of claim 11 , wherein disposing the display module on the stage comprises disposing the display module in a recess defined in an upper surface of the stage, and the opening is disposed in the recess.

18. The resolution measurement method of claim 11 ,
wherein the optical part comprises:
a plurality of transmissive regions; and
a plurality of pixels between the transmissive regions,

wherein the display module further comprises:
a display region disposed around the optical part and comprising the pixels; and
a non-display region around the display region,

wherein the pixels display an image, and the transmissive regions transmit an external light.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Sanghui
• Lee Jinwook

Classifications

• G02B7/02

  for lenses {(supports for magnifying lenses G02B25/002)} · CPC title

• G01N2021/178

  Methods for obtaining spatial resolution of the property being measured · CPC title

• H10K71/70

  Testing, e.g. accelerated lifetime tests · CPC title

• G01M11/04 Primary

  Optical benches therefor · CPC title

• G02B7/003

  Alignment of optical elements (G02B7/001, G02B7/002 take precedence; for mirrors G02B7/1822) · CPC title