Light engine and optics for HELIUM3D auto-stereoscopic laser scanning display

Akşit, Kaan; Ölçer, Selim; Erden, Erdem; Kishore, V.C.; Ürey, Hakan; Willman, Eero; Baghsiahi, Hadi; Day, SE; Selviah, David R.; Fernández, FA; Surman, Phil

doi:10.1109/3dtv.2011.5877226

Cited by 5 publications

(7 citation statements)

References 8 publications

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“…The light engine module in the projector version comprises red (640 nm), green (532 nm) and blue laser (473 nm) arrays coupled into a multimode optical fiber which, together with two cascaded cylindrical microlens arrays [11,12] homogenize and shape the beam into a 10 mm by 250 μm vertical light line. The optical design details of the beam-shaping optics were covered in [7,9,13]. Previously [9] the lasers were only homogenized using a dual microlens array homogenizer [11,12]; however, an undesired periodic light modulation was observed along the vertical line due to the periodicity of the microlenses.…”

Section: Multi-viewer Autostereoscopic Dynamic Exit Pupil Display Systemmentioning

confidence: 99%

“…The output profile of the light emitted from a multimode fiber as a function of angle in the far field is not a top hat profile but is nearer to a Gaussian profile [15]; however, if the fiber is wrapped around a cylindrical mandrel the modes are mixed and more of the modes of the multimode fiber are filled. We used two identical microlens arrays after the optical fiber to homogenize the intensity along the line [7,8]. The uniformity of the line, which is defined as the ratio of the minimum value to the maximum value along the line, is 85% over the central 10 mm required length, as opposed to the 48% uniformity obtained earlier by using the two microlens arrays alone.…”

Section: Multi-viewer Autostereoscopic Dynamic Exit Pupil Display Systemmentioning

confidence: 99%

“…Autostereoscopic 3D displays [1] display 3D images without the need for special viewer spectacles by using one of the following methods: (i) Holographic [2], (ii) Multi-view [3] (iii) Light field [4], (iv) Volumetric [5] or (v) Dynamic Exit Pupil [6][7][8][9]. This paper is concerned with the most recent method; that of the dynamic exit pupil (DEP) which had only been proposed but not experimentally demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic exit pupil trackers for autostereoscopic displays

Akşit¹,

Baghsiahi²,

Surman³

et al. 2013

Opt. Express

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This paper describes the first demonstrations of two dynamic exit pupil (DEP) tracker techniques for autostereoscopic displays. The first DEP tracker forms an exit pupil pair for a single viewer in a defined space with low intraocular crosstalk using a pair of moving shutter glasses located within the optical system. A display prototype using the first DEP tracker is constructed from a pair of laser projectors, pupil-forming optics, moving shutter glasses at an intermediate pupil plane, an image relay lens, and a Gabor superlens based viewing screen. The left and right eye images are presented time-sequentially to a single viewer and seen as a 3D image without wearing glasses and allows the viewer to move within a region of 40 cm × 20 cm in the lateral plane, and 30 cm along the axial axis. The second DEP optics can move the exit pupil location dynamically in a much larger 3D space by using a custom spatial light modulator (SLM) forming an array of shutters. Simultaneous control of multiple exit pupils in both lateral and axial axes is demonstrated for the first time and provides a viewing volume with an axial extent of 0.6-3 m from the screen and within a lateral viewing angle of ± 20° for multiple viewers. This system has acceptable crosstalk (< 5%) between the stereo image pairs. In this novel version of the display the optical system is used as an advanced dynamic backlight for a liquid crystal display (LCD). This has advantages in terms of overall display size as there is no requirement for an intermediate image, and in image quality. This system has acceptable crosstalk (< 5%) between the stereo image pairs.

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Section: Multi-viewer Autostereoscopic Dynamic Exit Pupil Display Systemmentioning

confidence: 99%

Section: Multi-viewer Autostereoscopic Dynamic Exit Pupil Display Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic exit pupil trackers for autostereoscopic displays

Akşit¹,

Baghsiahi²,

Surman³

et al. 2013

Opt. Express

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“…A large viewing field for the viewer in an autostereoscopic projection display can be achieved by creating tens of exit pupils using the parallax barrier approach [1], or using an array of projectors [2,3]. Alternatively, one can design a display tracking the viewer's eye using dynamic exit pupils [4][5][6]. The main advantage of tracking displays is that full resolution is achieved in each view, but they are typically limited to one or few viewers.…”

Section: Introductionmentioning

confidence: 99%

“…The main advantage of tracking displays is that full resolution is achieved in each view, but they are typically limited to one or few viewers. Projection based autostereoscopic displays employ various transfer screens to form an exit pupil, such as retro-reflective light diffusing screen [2,4], double lenticular screen [3], or Fresnel lens in front of a light shaping diffuser [5,7].…”

Section: Introductionmentioning

confidence: 99%

Multi-view autostereoscopic projection display using rotating screen

Eldes¹,

Akşit²,

Ürey³

2013

Opt. Express

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A new technique for multi-view autostereoscopic projection display is proposed, and demonstrated. The technique uses two mobile projectors, a rotating retro-reflective diffuser screen, and a head-tracking camera. As two dynamic viewing slits are created at the viewer's position, the slits can track the position of the eyes by rotating the screen. The display allows a viewer to move approximately 700 mm along the horizontal axis, and 500 mm along the vertical axis with an average crosstalk below 5 %. Two screen prototypes with different diffusers have been tried, and they provide luminance levels of 60 Cd/m2, and 160 Cd/m2 within the viewing field.

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Paper No 17.2: Head‐Tracked Dynamic Exit Pupil Multiuser Autostereoscopic Display

Surman

Day

Selviah

et al. 2013

Symp Digest of Tech Papers

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In this paper, a glasses‐free (autostereoscopic) display is described where the controlled illumination for a liquid crystal display (LCD) backlight is derived from a laser source where the laser is used not for its coherence properties but for its ability to have close control on its direction. This allows light exiting the LCD to be directed to the left and right eyes of several viewers who can move freely in both the X and Z directions. Light directions are determined by a spatial light modulator (SLM) that is controlled by a multiuser head tracker. This paper is principally concerned with the SLM and the Gabor superlens screen that is used to provide the angular magnification required to give a sufficiently wide viewing field,

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Light engine and optics for HELIUM3D auto-stereoscopic laser scanning display

Cited by 5 publications

References 8 publications

Dynamic exit pupil trackers for autostereoscopic displays

Dynamic exit pupil trackers for autostereoscopic displays

Multi-view autostereoscopic projection display using rotating screen

Paper No 17.2: Head‐Tracked Dynamic Exit Pupil Multiuser Autostereoscopic Display

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