VISION SYSTEM, ALIGNMENT SYSTEM FOR ALIGNING DISPLAY PANEL AND PATTERNED RETARDER ON STEREOSCOPIC IMAGE DISPLAY USING THE VISION SYSTEM

• US 20120162399A1
• Filed: 12/21/2011
• Published: 06/28/2012
• 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
• Granted Patent: US 9,618,761 B2
• Time in Patent Office: Days
• US Class Current: 348/54
• 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; and

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.

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:

a 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 patterned retarder further comprises:

a dummy pattern having a thickness more than a thickness of each of the first and second patterns, 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.

10. A system of aligning a patterned retarder and a display panel of a three dimensional image display apparatus, the system comprising:

a first alignment stage that supports the patterned retarder including first and second patterns having different optical axes and calibrates a position of the patterned retarder;

a first vision system that obtains images of the first and second patterns of the patterned retarder;

a second alignment stage that supports the display panel and calibrates a position of the display panel;

a second vision system that obtains images of alignment marks provided at edge portions of the display panel; and

a drum that receives the patterned retarder from the first alignment stage and attaches the patterned retarder onto the display panel on the second alignment stage, wherein

the first 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.

11. The system of claim 10, further comprising:

a motor configured to rotate the rotatable ¼

wavelength plate.

12. The system of claim 11,

the motor comprising a gear member;

the rotatable ¼

wavelength plate comprising a gear member;

wherein the gear member of the motor is engaged with the gear member of the rotatable ¼

wavelength plate.

13. The system of claim 12,

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

wavelength plate.

14. The system of claim 10, wherein the patterned retarder is disposed under the rotatable ¼

wavelength plate.

15. The system of claim 10, wherein the patterned retarder comprises:

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

16. The system of claim 10, wherein the patterned retarder further comprises:

a dummy pattern having a thickness more than a thickness of each of the first and second patterns, wherein the dummy pattern has the same polarization characteristic as one of the first and second patterns.

17. The system of claim 15, wherein the first alignment stage is configured to adjust a position of the patterned retarder in directions of x, y, and θ

axes.

18. The system of claim 17, wherein the first 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.

19. The system of claim 11, further comprising:

a control computer configured to control the first alignment stage, the first vision system, the second alignment stage, the second vision system, the drum, and the motor, wherein the control computer is further configured to activate the motor to rotate the rotatable ¼

wavelength plate until a contrast ratio between the first and second patterns becomes more than a predetermined value in an image obtained by the camera.