48.4: Beam Forming for a Laser Based Auto‐stereoscopic Multi‐Viewer Display

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

doi:10.1889/1.3621421

Cited by 3 publications

(4 citation statements)

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“…The best solution was found to be the use of a step index multimode optical fiber for mixing and homogenizing the laser beams [8]. If a sufficiently long multimode fiber is used the different mode velocities ensure that the modes are spaced by more than the coherence time, thus, reducing speckle noise [14] due to interference of the modes.…”

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%

“…The dynamic exit pupil demonstrator was also converted into a novel type of display by using it as the backlight for a large area 120 Hz LCD. The original intention of the HELIUM3D display [1,6,8] was to present images at a 480 Hz frame rate from a projection engine to supply four separate left-right image pairs providing motion parallax for four viewers. This was the reason for choosing a display configuration that is basically a projection system where images produced on a small LCOS device are transferred through several lenses and optical elements to the front screen via an intermediate image stage (L 2 in Fig.…”

Section: Dep Displaymentioning

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: Dep Displaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic exit pupil trackers for autostereoscopic displays

Akşit¹,

Baghsiahi²,

Surman³

et al. 2013

Opt. Express

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HELIUM3D: A laser-scanned head-tracked autostereoscopic display

Surman

Day

Willman

et al. 2011

2011 International Conference on 3D Imaging (IC3D)

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This paper describes the development of an autostereoscopic laser-based display that can serve several users who are able to move freely over a large area; it is intended for television applications and operates by tracking the positions of the viewers' heads and directing regions referred to as exit pupils towards their eyes. An exit pupil is a region where either a left or a right image is seen across the complete area of the screen. A description of the 60 and 120Hz prototypes developed is given. A set-up that does not show images but demonstrates the operation of the novel dynamic exit pupil formation system is also described

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