(19) TZZ ¥ T (11) EP 2 838 266 A2 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 18.02.2015 Bulletin 2015/08 H04N 13/04 (2006.01) (21) Application number: 14180691.9 (22) Date of filing: 12.08.2014 (84) Designated Contracting States: • Lighthouse Technologies (Huizhou) Ltd. AL AT BE BG CH CY CZ DE DK EE ES FI FR GB Huizhou, Guangdong 516003 (CN) GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (72) Inventors: Designated Extension States: • Kikkawa, Shinsaku BA ME Kawasaki-shi, Kanagawa, 214-0001 (JP) • Chan, Kui Lai Curie (30) Priority: 12.08.2013 US 201313964930 Hong Kong (CN) (71) Applicants: (74) Representative: Maiwald Patentanwalts GmbH • Lighthouse Technologies Limited Engineering Hong Kong (CN) Elisenhof Elisenstrasse 3 80335 München (DE) (54) Three-dimensional television display (57) A three-dimensional television display including array parallax, selection of the disposition of LED arrays an LED screen having an array of light sources where in the multiple LED array parallax, a diagonal parallax the resolution of glass-less three-dimensional television barrier and lenticular lenses. display may be improved through the use of multiple LED EP 2 838 266 A2 Printed by Jouve, 75001 PARIS (FR) 1 EP 2 838 266 A2 2 Description significant Moire patterns are observed from viewers at varying viewing distances. CROSS-REFERENCE TO RELATED APPLICATION BRIEF SUMMARY OF THE INVENTION [0001] Thisapplication claims priorityto and the benefit 5 of U.S. Serial No. 13/964,930, filed August 12, 2013, [0006] In consideration of the above problems, in ac- which is incorporated herein by reference. cordance with one aspect of the present invention, a three-dimensional television display is disclosed herein TECHNICAL FIELD OF THE INVENTION that includes an LED screen having an array of light 10 sources that emit light, a lenticular lens positioned adja- [0002] The present invention relates to improvements cent to the LED screen and designed to diagonally dis- in three dimensional LCD displays. More specifically, the tribute the light emitted from each of the light sources in resolution of glass-less three-dimensional television dis- the array, and a parallax barrier adjacent to the lenticular plays may be improved through the use of multiple LED lens and comprised of a plurality of slits that transmit the array parallax, selection of the disposition of LED arrays 15 distributed light to a viewer of the three-dimensional dis- in the multiple LED array parallax, a diagonal parallax play device. barrier and lenticular lenses. [0007] In another aspect of the present invention, the display device further comprises a polycarbonate board BACKGROUND OF THE INVENTION positioned between the LED screen and the lenticular 20 lens. [0003] Three-dimensional ("3D") television is a devel- [0008] In another aspect of the present invention, the oping technology for the consumer display market. Gen- parallax barrier of the display device is positioned a dis- erally speaking, 3D television conveys depth perception tance A from the lenticular lens and the distance A is to a viewer by employing various display techniques such substantially equal to a viewing distance of the viewer as stereoscopic display, multi-view display, 2D-plus-25 divided by 15. depth, or any other form of 3D display. The basic tech- [0009] In another aspect of the present invention, the nical requirement to achieve a 3D display is to display lenticular lens comprises a plurality of lenticules each offset images that are filtered separately to the left eye having a center axis that is offset between 0° and 90° and right eye. from the horizontal plane of the display screen. [0004] Conventionally, the primary technique 30to [0010] In another aspect of the present invention, each achieve a 3D display for a viewer is to require the viewer of the plurality of diagonally extending lenticules of the to wear eyeglasses to filter the separately offset images lenticular lens is optically cylindrically converging. to each eye. Common 3D display technologies involving [0011] In another aspect of the present invention, the eyeglass filters or lenses include: (1) anaglyph 3D - with lenticular lens of the display device has a thickness that passive color filters; (2) polarized 3D system - with pas- 35 is dependent on a pixel pitch of the light sources. sive polarization filters; (3) active shutter 3D system - [0012] In another aspect of the present invention, the with active shutters; and (4) head-mounted display - with lenticular lens is positioned approximately 6.0 mi llimeters a separate display positioned in front of each eye, and from the display screen. lenses used primarily to relax eye focus. [0013] In another aspect of the present invention, the [0005] From the point of view of the consumer, al-40 lenticular lens has a thickness of 0.26 millimeters. though the 3D glasses hardware for 3D display technol- [0014] In another aspect of the present invention, the ogy has developed significantly and also enables 3D im- light sources are light emitted diodes. ages to be viewed by multiple viewers at the same time, [0015] In another aspect of the present invention, the this technology still suffers from a problem in which the three-dimensional television display further comprising viewers must wear special glasses to see the 3D images. 45 a parallax array having light elements with a horizontal As a result, multiple manufacturers have invested in the width, thelight elementsdisposed in groups of for arrayed development of 3D display technology that does not re- two horizontal and two vertical; and the slits of the barrier quire the viewer to wear special glasses. In fact, this 3D having a horizontal width equal to approximately one half displaytechnology has currently developed into themulti- the horizontal width of the light elements. view display technology which enables multiple viewers 50 [0016] In another aspect of the present invention, a to view the 3D images at the same time. Yet, even as parallax array has light elements with a horizontal width, this technology progresses, the current state of the art the light elements disposed in groups of for arrayed two still has many drawbacks. For example, while conven- horizontal and two vertical where the slits of the barrier tional 3D LCD televisions have good resolution (e.g., 0.5 having a horizontal width equal to approximately one half mm dot pitch) and provide a better 3D view by utilizing, 55 the horizontal width of the light elements. for example, multiple parallax barriers, such designs are [0017] In another aspect of the present invention, the limited to a small number of viewers. Moreover, conven- plurality of slits of the parallax barrier extend in a diagonal tional 3D designs continue to present images in which direction. 2 3 EP 2 838 266 A2 4 [0018] In another aspect of the present invention, a ing to an exemplary embodiment of the present in- method of generating a three-dimensional image from vention; the perspective of a viewer comprising emitting light from a display screen having a flat panel array of light sources; FIG. 3 illustrate an exemplary image of the light dis- distributing light through a plurality of lenticular lenses in 5 tribution according to an exemplary embodiment of oblong patterns, with the lenticular lenses disposed ad- the present invention; jacent to the display screen and having a center axis that is offset between 0° and 90° from a horizontal plane of FIG. 4 illustrates a close up view of a parallax barrier the display screen; and emitting select portions of the of the 3D display device in accordance with an em- distributed light through a plurality of slits in a parallax 10 bodiment of the present invention; barrier to a viewer of the three-dimensional display de- vice. FIGS. 5A through C illustrates a conventional four [0019] In another aspect of the present invention, the parallax array and barrier using four horizontal LED parallax barrier is positioned a distance A from the len- arrays per block; ticular lens and the distance A is substantially equal to a 15 viewing distance of the viewer divided by 15. FIGS. 6A through C shows a four parallax array and [0020] In another aspect of the present invention, the barrier of the present invention using horizontal and plurality of slits of the parallax barrier extend in a diagonal vertical LED arrays per block; direction. [0021] In another aspect of the present invention,20 FIGS. 7 illustrates the parallax distribution for the where a size of the plurality of slits is approximately equal four parallax array of the present invention; to (LI * P)/L2, where L1 is the distance from the viewer to the parallax barrier, P is the pitch of the light sources FIGS. 8A through C shows a four parallax array and and L2 is the distance from the viewer to the display barrier of the present invention using a diagonal bar- screen. 25 rier; [0022] In another aspect of the present invention, a display screen having an array of light emitting diodes FIGS. 9A through C shows a four parallax array and configured as a four parallax array with the light elements barrier of the present invention using displaced hor- grouped two horizontal and two vertical; and a parallax izontal and vertical LED arrays per block; and barrier offset from the display screen by a distance de- 30 termined by a reduction ratio and having a plurality of FIG. 10 shows the parallax distribution for the four slits to transmit the distributed light to a viewer of the parallax arrays of the present invention.