3D image based alignment method

Patent metadata

Field	Value
Publication number	US-9341859-B2
Application number	US-201213543356-A
Country	US
Kind code	B2
Filing date	Jul 6, 2012
Priority date	Jul 6, 2012
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

An alignment method applied to a barrier-type 3D display includes providing a 3D alignment device at least comprising an image capture tool and an alignment shift analysis software; disposing a display panel with a barrier laminated thereon in the 3D alignment device; presenting a display and a barrier alignment check patterns on the display panel and the barrier; the image capture tool capturing an image of a moiré pattern generated by the display and the barrier alignment check patterns; analyzing the image of the moiré pattern by the alignment shift analysis software, and determining at least three measurement points of the image of the moiré pattern; calculating position shift for each measurement point and rotation angle between display panel and barrier by the alignment shift analysis software; and adjusting corresponding position between display panel and barrier if the calculation results exceed predetermined alignment errors.

First claim

What is claimed is:

1. An alignment method, applied to a barrier-type 3D display, comprising:
providing a 3D alignment device at least comprising an image capture tool and an alignment shift analysis software coupled to the image capture tool;
disposing a display panel with a barrier laminated thereon in the 3D alignment device, and the image capture tool positioned above the barrier;
independently and separately presenting a display alignment check pattern on the display panel and a barrier alignment check pattern on the barrier, wherein the display alignment check pattern is different from the barrier alignment check pattern;
the image capture tool capturing an image of a moiré pattern generated by the barrier alignment check pattern laminating on the display alignment check pattern;
analyzing the image of the moiré pattern by the alignment shift analysis software, and determining at least three measurement points correspondingly at an upper portion and an lower portion of the image of the moiré pattern;
calculating a position shift for each of the measurement points by the alignment shift analysis software;
calculating a rotation angle (at a x-y plane) between the display panel and the barrier from position shift calculation results of the measurement points; and
adjusting corresponding position between the display panel and the barrier if the position shift results of the measurement points and the rotation angle exceed a predetermined alignment error,
wherein the image capture tool is positioned correspondingly to a virtual center line of the display panel, and the measurement points are positioned correspondingly to the virtual center line of the display panel, the position shift calculated by the alignment shift analysis software is a x-position shift (Δx) or a y-position shift (Δy) for each of the measurement points:

Δ
⁢

⁢
x

=

-

W
pix

·
tan

⁢

⁢

θ
0



tan
⁢

⁢

θ
1

-

tan
⁢

⁢

θ
0



,

Δ
⁢

⁢
y

=

-

W
pix

·
tan

⁢

⁢

θ
0



tan
⁢

⁢

θ
1

-

tan
⁢

⁢

θ
0



,

where W pix is pixel width of display panel, and two angles (θ 0 ,θ 1 ) are angles of two separate measurement points to the virtual center line.

2. The alignment method according to claim 1 , wherein each of the measurement points is a point with the same brightness of different views.

3. The alignment method according to claim 2 , wherein the step of analyzing the image of the moiré pattern comprises drawing different view curves by extracting brightness intensity data versus position of the image of the moiré pattern, and the measurement points are determined by finding crossing points of the view curves.

4. The alignment method according to claim 1 , wherein when the barrier-type 3D display is a two view 3D display, the display panel comprises plural right (R) pixels and left (L) pixels respectively for right eye view and left eye view, and the display alignment check pattern comprises:
a first part, having a first group of opaque and transmissive interlaced vertical stripes to allow the right (R) pixels on only; and
a second part, having a second group of opaque and transmissive interlaced vertical stripes to allow the left (L) pixels on only.

5. The alignment method according to claim 1 , wherein when the barrier-type 3D display is a multi-view 3D display with n view (n>2, n is integer), the display panel comprises plural view- 1 pixels, view- 2 pixels to view-n pixels, and the display alignment check pattern comprises a first group, a second group to a n-th group of opaque and transmissive vertical stripes to respectively allow showing the view 1 , view- 2 to view-n pixels on image only.

6. The alignment method according to claim 1 , wherein the display panel comprises plural pixels, and the alignment method further comprising:
calculating an optical distance (d air ) of said each measurement point between corresponding pixel and barrier in air by the alignment shift analysis software.

7. The alignment method according to claim 6 , further comprising:
adjusting an optical gap between the display panel and barrier according to calculation result of the optical distance by a stage control unit coupled to the alignment shift analysis software.

8. The alignment method according to claim 1 , wherein the image capture tool is positioned correspondingly to the virtual center line of the display panel, and a first and a second measurement points are positioned correspondingly to the virtual center line of the display panel, and one measurement point is at an upper virtual line while the other at an lower

Assignees

• Sumi Naoki
• Takahashi Satoru
• Innolux Corp
• Innocom Tech Shenzhen Co Ltd

Inventors

• Sumi Naoki
• Takahashi Satoru

Classifications

• H04N13/327

  Calibration thereof · CPC title

• H04N13/31

  using parallax barriers · CPC title

• G02B27/60 Primary

  Systems using moiré fringes · CPC title

• G02B30/27

  involving lenticular arrays · CPC title

• G02B27/2214

  Physics · mapped topic