Vision system, alignment system for aligning display panel and patterned retarder on stereoscopic image display using the vision system

• US 9,618,761 B2
• Filed: 12/21/2011
• Issued: 04/11/2017
• Est. Priority Date: 12/22/2010
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, Wonki, Park, Mikyung
• Primary Examiner(s): Philippe, Gims
• Assistant Examiner(s): Carter, Richard
• Application Number:
  US13/333,182
• Publication Number:
  US 20120162399A1
• Time in Patent Office: 1,938 Days
• Field of Search: 348 54, 348135, 348 57, 340583, 345 6, 345589, 349 18, 359 1
• CPC Class Codes: G02B 30/25 using polarisation techniques

Abstract

A vision system for obtaining an image of a patterned retarder comprising first and second patterns having different optical axes is provided. The vision system comprises a camera, a ½ wavelength plate arranged in front of a lens of the camera, a rotatable ¼ wavelength plate arranged in front of the ½ wavelength plate.

Claims

1. A vision system for obtaining an image of a patterned retarder comprising first and second patterns having different optical axes, the vision system comprising:

a camera;

a ½

wavelength plate arranged in front of a lens of the camera;

a rotatable ¼

wavelength plate arranged in front of the ½

wavelength plate, wherein a gear member is provided on a circumferential surface of the rotatable ¼

wavelength plate;

and a dummy pattern including a first dummy pattern and a second dummy pattern being disposed at upper and lower portions of the first and second patterns,

wherein the first and second patterns and the dummy pattern are formed on a same film base, and

wherein the first and second patterns are disposed alternately and have different optical axes.

2. The vision system of claim 1, further comprising:

a motor configured to rotate the rotatable ¼

wavelength plate.

3. The vision system of claim 2, wherein the motor comprises a gear member configured to engage with the gear member of the rotatable ¼

wavelength plate to rotate the rotatable ¼

wavelength plate.

4. The vision system of claim 1, wherein the patterned retarder is disposed under the rotatable ¼

wavelength plate.

5. The vision system of claim 1, wherein the patterned retarder comprises:

the film base, wherein a pattern layer is formed on a first surface of the film base and includes the first and second patterns,

a release film covering an adhesive applied on the pattern layer, and

a protection film covering a second surface of the film base, wherein the second surface is opposite to the first surface of the film base, and wherein the protection film faces the rotatable ¼

wavelength plate.

6. The vision system of claim 1, wherein the dummy pattern has the same polarization characteristic as one of the first and second patterns.

7. The vision system of claim 5, further comprising:

an alignment stage that supports the patterned retarder, adjusts a position of the patterned retarder in directions of x, y, and θ

axes, and calibrates an aligned state of the patterned retarder.

8. The vision system of claim 7, wherein the alignment stage comprises:

a reflection plate, and a ½

wavelength plate on the reflection plate, wherein the ½

wavelength plate of the alignment stage faces the release film of the patterned retarder.

9. The vision system of claim 2, further comprising:

a control computer configured to activate the motor until a contrast ratio between the first and second patterns becomes more than a predetermined value in an image obtained by the camera.