| US 7,468,838 B2 | ||
| Stereoscopic display for switching between 2D/3D images | ||
| Kyung-hoon Cha, Yongin-si (Korea, Republic of); Serguei Chestak, Suwon-si (Korea, Republic of); and Dae-sik Kim, Suwon-si (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd., Suwon-si (Korea, Republic of) | ||
| Filed on Nov. 10, 2005, as Appl. No. 11/270,479. | ||
| Claims priority of application No. 10-2005-0028075 (KR), filed on Apr. 04, 2005. | ||
| Prior Publication US 2006/0221443 A1, Oct. 05, 2006 | ||
| Int. Cl. G02B 27/26 (2006.01) | ||
| U.S. Cl. 359—465 [348/58; 349/15; 353/8] | 10 Claims |
| 1. A stereoscopic display for switching between a two-dimensional (2D) image and a three-dimensional (3D) image, the stereoscopic
display comprising:
a display device which displays an image; and
a parallax barrier unit which substantially transmits incident light in a 2D mode, and forms barriers to substantially separate
an image for a left eye from an image for a right eye in a 3D mode,
wherein the parallax barrier unit comprises:
a first polarization plate which transmits light with a first polarization direction;
a first polarization grating screen including a plurality of first birefringence elements that each rotate a polarization
direction of light transmitted by the first polarization plate by a predetermined angle in a first direction and a plurality
of second birefringence elements that each rotate the polarization direction of light transmitted by the first polarization
plate by the predetermined angle in a second direction substantially opposite to the first direction, wherein the first birefringence
elements and the second birefringence elements are arranged in a matrix array such that the first and second birefringence
elements form parallel columns of alternating birefringence elements and parallel rows of alternating birefringence elements;
a second polarization grating screen which faces the first polarization grating screen and includes a plurality of third birefringence
elements that each rotate a polarization direction of light transmitted by the first polarization grating screen by the predetermined
angle in the first direction and a plurality of fourth birefringence elements that each rotate the polarization direction
of light transmitted by the first polarization grating screen by the predetermined angle in the second direction substantially
opposite to the first direction, wherein the third birefringence elements and the fourth birefringence elements are arranged
in a matrix array such that the third and fourth birefringence elements form parallel columns of alternating birefringence
elements and parallel rows of alternating birefringence elements; and
a second polarization plate which faces the second polarization grating screen and transmits only light with a second polarization
direction of light transmitted by the second polarization grating screen; and
wherein at least one of the first polarization grating screen and the second polarization grating screen is movable horizontally
and vertically substantially simultaneously such that vertical barriers for the 3D image are formed generating horizontal
parallax, and horizontal barriers for the 3D image are formed generating vertical parallax.
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