56.1: High‐Frame‐Rate, High‐Contrast Grating Light Valve Laser Projection Display

Kikuchi, Hiroe; Hashimoto, Shigeki; Tajiri, Shinichiro; Hayashi, Tsuneo; Sugawara, Yutaka; Oka, Motoo; Akiyama, Yoshiyuki; Nakamura, Akira; Eguchi, Naoya

doi:10.1889/1.3069803

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Performance of observers for an aircraftorientation discrimination task was significantly better than has previously been measured for CRT projectors, even for an image size similar to that typically used in flight-simulator applications. Additionally, expected reliability is also high, as demonstrated by 185 days of nearly continuous operation in Aichi, Japan in 2005 [4].…”

Section: Discussionmentioning

confidence: 99%

59.5L: Late‐News Paper: Evaluation of a Prototype Grating‐Light‐Valve Laser Projector for Flight Simulation Applications

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Gaska²,

Geri³

et al. 2008

Symp Digest of Tech Papers

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An evaluation of a prototype grating light valve laser projector indicates it has properties well-suited to flight-simulation applications. Full-field luminance and contrast, spatial resolution, temporal resolution, and color stability were equal to or better than those of CRT projectors typically used in flight-simulator applications. In addition, this projector is capable of providing refresh rates greater than 60 Hz. The higher refresh rates eliminate perceived flicker, and greatly reduce (120 Hz) or eliminate (240 Hz) motion artifacts over the range of target speeds tested. IntroductionDigital projectors, such as LCD, LCoS, and DLP projectors, typically provide better spatial resolution than CRT projectors. However, tracking blur, which occurs when an observer tracks moving imagery, is greater for most digital projectors due to a longer within-frame hold-time than that of CRTs [6,7]. Digital projectors can be relatively easily modified to reduce their holdtime, and we have previously evaluated several such projectors for possible use in flight-simulator applications [12,13]. Those evaluations verified the high contrast and spatial resolution of digital projectors, and also indicated that tracking blur could be reduced sufficiently for use in many simulator applications.The potential benefits of laser-projector technology are generally well-known [11], and include high-pixel count, short hold-time, and expanded color gamut. However the development of a such a projector has, to date, proved problematic. Sony Corporation has recently developed a prototype laser projector: the GxL (G-by-L), which may be sufficiently stable to provide high-resolution images suitable for flight-simulator applications. In addition, the projector can provide refresh rates of 60 Hz, 120 Hz, and 240 Hz, by effectively exchanging spatial and temporal resolution. Based on previous studies [5, 10] we expected that high frame/refresh rates would reduce or eliminate many motion artifacts. Additionally, increasing refresh rate can produce the added benefit of increasing luminance and contrast [8].We describe here an evaluation of the GxL prototype laser projector and discuss implications for flight simulation. The evaluation included instrument measurements of display luminance, contrast, spatial resolution, temporal characteristics, and color stability. In addition, psychophysical experiments were performed to assess the effects of higher spatial resolution on aircraft-orientation discrimination, and the effects of higher temporal resolution on perceived tracking blur, image flicker, and motion fidelity. MethodsThe GxL prototype laser projector evaluated here is based on grating light valve technology, and can produce images of 7680 × 1080 pixels at 60 Hz, 3840 × 1080 pixels at 120 Hz, or 1920 × 1080 pixels at 240 Hz (additional details on the GxL can be found in Kikuchi, et al., in press [4]). Although the GxL is typically demonstrated in curved (60 Hz) and flat (120 Hz and 240 Hz) front projection configurations, the current evaluation wa...

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Section: Discussionmentioning

confidence: 99%

59.5L: Late‐News Paper: Evaluation of a Prototype Grating‐Light‐Valve Laser Projector for Flight Simulation Applications

Winterbottom

Gaska²,

Geri³

et al. 2008

Symp Digest of Tech Papers

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“…The image was produced using 12 GLV projectors giving a brightness of 60; 000 lm [134]. Later developments in the technology led to projectors with 1920 pixel horizontal resolution at a frame rate of 240 Hz [137]. Based on GLV technology, the Evans & Sutherland Computer Corporation introduced two commercial projectors.…”

Section: A Displays With Single-axis Scanningmentioning

confidence: 99%

Laser-based displays: a review

2010

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After the invention of lasers, in the past 50 years progress made in laser-based display technology has been very promising, with commercial products awaiting release to the mass market. Compact laser systems, such as edge-emitting diodes, vertical-cavity surface-emitting lasers, and optically pumped semiconductor lasers, are suitable candidates for laser-based displays. Laser speckle is an important concern, as it degrades image quality. Typically, one or multiple speckle reduction techniques are employed in laser displays to reduce speckle contrast. Likewise, laser safety issues need to be carefully evaluated in designing laser displays under different usage scenarios. Laser beam shaping using refractive and diffractive components is an integral part of laser displays, and the requirements depend on the source specifications, modulation technique, and the scanning method being employed in the display. A variety of laser-based displays have been reported, and many products such as pico projectors and laser televisions are commercially available already.

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“…[11]), but frequency converted lasers offer smaller wall-plug efficiencies of about 20 % (e.g. [12]), as also the efficiency of the frequency conversion has to be taken into account.…”

Section: Power Consumption and Coolingmentioning

confidence: 99%

Future prospects of high-end laser projectors

Janssens

Malfait

2009

SPIE Proceedings

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During the last years, a trend to replace commonly used short arc lamps in projection systems with alternative light sources is seen. Next to LEDs for low light output products, lasers try to enter the projection area and have the ambition to infiltrate from low (picoprojection) towards high light output systems (digital cinema).One of the benefits of lasers is their narrow spectral bandwidth. As a consequence, the display can have a very large colour gamut, if the lasers are carefully selected. Another benefit is the very low intrinsic étendue of the source. One can imagine using less complex, more efficient, smaller but more powerful optical systems. This not only for scanning projectors, but also for 2D light valve based projectors (LCOS, LCD, DLP). In addition, the limited lifetime of lamps has serious impact on a system's cost of ownership, and puts light source reliability/lifetime high on the list of priorities for future developments. For this reason, Barco entered the European FP6-project OSIRIS, in a subtask where a 300 lm laser projector demonstrator has to be developed and evaluated.So far, we found out that next to obvious challenges such as laser cost and laser power, the most critical issue regarding image quality is speckle interference which counteracts the beneficial nature of the light source. This phenomenon is a direct consequence of the coherent nature of a laser and cannot be solved as easily as is often claimed. We will describe laser speckle in the context of laser projection and the theoretical limits of several reduction techniques. This leads to guidelines which can make laser projection worth considering.

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56.1: High‐Frame‐Rate, High‐Contrast Grating Light Valve Laser Projection Display

Abstract: We report a high frame rate (240Hz), high contrast (30,000:1), wide color gamut GxL (G-by-L) laser projector. Proposed application areas for GxL are also discussed.

Cited by 6 publications

References 5 publications

59.5L: Late‐News Paper: Evaluation of a Prototype Grating‐Light‐Valve Laser Projector for Flight Simulation Applications

59.5L: Late‐News Paper: Evaluation of a Prototype Grating‐Light‐Valve Laser Projector for Flight Simulation Applications

Laser-based displays: a review

Future prospects of high-end laser projectors

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