# US 7,607,780 B2 · Projection-type 3-D image display using single projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,607,780 B2 - Document ID: US7607780B2 - Status: Granted - Kind: B2 - Application number: 11/262,854 - Filed: 2005-11-01 - Published: 2006-07-06 - Granted: 2009-10-27 - Earliest claimed: 2004-12-30 - Assignees: Samsung Electronics Co., Ltd. - Inventors: Tae-hee Kim; Sung-yong Jung; Kun-ho Cho - Web page: https://patentgrep.com/patent/US7607780B2 ## CPC - H04N 9/31: Projection devices for colour picture display {, e.g. using electronic spatial light modulators [ESLM]} - G02B 30/24: involving temporal multiplexing, e.g. using sequentially activated left and right shutters - G03B 35/16: by sequential viewing - G03B 35/24: using apertured or refractive resolving means on screens or between screen and eye - H04N 13/305: using lenticular lenses, e.g. arrangements of cylindrical lenses - H04N 13/307: using fly-eye lenses, e.g. arrangements of circular lenses - H04N 13/31: using parallax barriers - H04N 13/359: Switching between monoscopic and stereoscopic modes - H04N 13/363: using image projection screens (volumetric display H04N13/388) - H04N 5/7408: {Direct viewing projectors, e.g. an image displayed on a video CRT or LCD display being projected on a screen} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A projection-type 3-D image display includes a light source, a single display element, an image shift member, a projection lens unit, and a screen unit. The display element produces an image using light emitted from the light source. The image shift member time-sequentially shifts the image. The projection lens unit enlarges and projects the time sequentially shifted image. The screen unit includes an image separation unit. The image separation unit separates the time sequentially shifted image into images for a left eye and images for a right eye. The projection-type 3-D image display can realize a 3-D image using a single projector by having the image shift member to sequentially shift the images produced by the display element. ## Claims ### Claim 1 A projection-type 3-D (3-dimensional) image display device comprising: a light source; a single display element to sequentially produce images for a left eye and images for a right eye using light emitted from the light source; an image shift member to time-sequentially shift the images produced by the display element; a projection lens unit to enlarge and project the time-sequentially shifted images; and a screen unit having an image separation unit to separate the projected time-sequentially shifted images into the images for a left eye and the images for a right eye, wherein the image separation unit comprises one of a lenticular lens, a fly-eye lens array, and a parallax barrier. ### Claim 2 (depends on 1) The device of claim 1, wherein the display element comprises one of an LCD (liquid crystal display), an FLCD (ferro liquid crystal display), and a movable mirror device. ### Claim 3 (depends on 1) The device of claim 1, wherein the image shift member comprises a rotatable mirror. ### Claim 4 (depends on 3) The device of claim 3, wherein the image shift member operates at the same frequency as that of an image signal input to the display element. ### Claim 5 (depends on 1) The device of claim 1, further comprising: a polarization conversion switch disposed between the display element and the image shift member to selectively switch a polarization direction of the images produced by the display element, wherein the image shift member comprises one or more birefringence elements whose refractive indexes change depending on the polarization direction of the images that have passed through the polarization conversion switch to transmit or refract the images. ### Claim 6 (depends on 5) The device of claim 5, wherein the polarization conversion switch is an LC (liquid crystal) polarization converter. ### Claim 7 (depends on 5) The device of claim 5, wherein the polarization conversion switch is switched on or off in synchronization with an image signal input to the display element. ### Claim 8 (depends on 5) The device of claim 5, wherein the one or more birefringence elements comprise one of calcite and nematic liquid crystal. ### Claim 9 (depends on 5) The device of claim 5, wherein the image shift member further comprises one or more prisms bonded to the one or more birefringence element. ### Claim 10 (depends on 9) The device of claim 9, wherein the one or more birefringence elements and the one or more prisms are arranged in an array. ### Claim 11 (depends on 1) The device of claim 1, wherein the display element has a fill factor that depends on a number of view points of an image. ### Claim 12 (depends on 1) The device of claim 1, wherein the display element has a fill factor of 0.5. ### Claim 13 A projection-type 3-D (3-dimensional) image display device comprising: a light source; a single display element to sequentially produce images for a left eye and images for a right eye using light emitted from the light source; an image shift member to time-sequentially shift the images produced by the display element; a projection lens unit to enlarge and project the time-sequentially shifted images; and a screen unit having an image separation unit to separate the projected time-sequentially shifted images into the images for a left eye and the images for a right eye, wherein the image separation unit comprise an LC (liquid crystal) barrier to selectively switch between a 2-D image and a 3-D image. ### Claim 14 A projection-type 3-D (3-dimensional) image display apparatus, comprising: a display unit to form images according to input light and an input image signals; an image shift unit to sequentially control the images formed by the display unit to proceed along first and second paths; a projection unit to enlarge and project the images proceeding along the first and second paths; and a screen unit to focus the projected images proceeding along the first and second paths to first and second predetermined points, respectively, wherein the screen unit has an image separation unit comprising one of a lenticular lens, a fly-eye lens array, a parallax barrier, and a LC (liquid crystal barrier). ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the first predetermined point corresponds to one of right and left eyes of a viewer, and the second predetermined point corresponds to the other one of the right and left eye of the viewer. ### Claim 16 (depends on 14) The apparatus of claim 14, wherein the image shift unit comprises: a movable mirror to periodically move between a first position to reflect the images to proceed along the first path and a second position to reflect the images to proceed along the second path. ### Claim 17 A method of displaying a 3-D (3-dimensional) image, comprising: producing images using light emitted from a light source and an input image signal; sequentially shifting the images to direct the images along first and second paths; and focusing the images directed along the first path toward a first predetermined viewing position and the images directed along the second path toward a second predetermined viewing position by using an image separation unit comprising one of a lenticular lens, a fly-eye lens array, a parallax barrier, and a LC (liquid crystal) barrier. ### Claim 18 (depends on 17) The method of claim 17, wherein the sequentially shifting of the images comprises: periodically rotating a mirror between first and second positions to direct the images along the first and second paths. ### Claim 19 (depends on 17) The method of claim 17, wherein the sequentially shifting of the images comprises: sequentially controlling the images to have first and second polarization directions; and directing the images along the first and second paths according to polarization direction thereof. ### Claim 20 (depends on 17) The method of claim 17, wherein the focusing of the images directed along the first path toward a first predetermined viewing position and the images directed along the second path toward a second predetermined viewing position comprises: enlarging and projecting the images directed along the first and second paths to be incident on a screen at first and second angles, respectively; and condensing the images incident on the screen at the first and second angles to the first and second predetermined viewing positions, respectively. ### Claim 21 A projection-type 3-D (3-dimensional) image display device comprising: a light source; a single display element to sequentially produce images at a plurality of view points using light emitted from the light source; an image shift member to time-sequentially shift the images produced by the display element; a projection lens unit to enlarge and project the time-sequentially shifted images; and a screen unit having an image separation unit to separate the projected time-sequentially shifted images into the images at a plurality of view points, wherein the image separation unit comprises one of a lenticular lens, a fly-eye lens array, a parallax barrier, and a LC (liquid crystal barrier).