61.3: LED Light Source for RPTV Applications

Breidenassel, Nicole; Grötsch, Stefan; Schnabel, Wolfgang

doi:10.1889/1.2433393

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…For this reason, flat surface emitters that are easier to couple have been developed. These devices use alternative extraction improvement techniques, such as micro-reflector (Osram "Ostar", [8], [9]) and photonic lattices (Luminus "PhlatLight," [10], [11]).…”

Section: Decreasing Losses In the Light Enginementioning

confidence: 99%

Design Methodology for High Brightness Projectors

Fournier

Rolland

2008

J. Display Technol.

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The low luminance levels of light-emitting diodes (LEDs) compared to arc lamps make it difficult to design high-brightness LED-based projectors. Besides, the specificities of LEDs do not always allow using the same design schemes as with arc lamp-based projection displays. This paper performs a taxonomy of the techniques that can be used to increase the brightness of LED-based projection displays. We show that, in étendue-limited systems, the perceived brightness depends on the system étendue limit, the efficiency of the light engine, and the source luminance. The ability to improve each of these parameters depends on the design constraints. The system étendue limit can be increased at the expense of bulkier, more complex, and more expensive designs. The light engine efficiency can be increased by using free-form shape components adapted to the shapes and the emission patterns of the considered LEDs. The apparent source luminance can be increased at the expense of the flux by either recycling light or restricting the light collection to a smaller étendue with higher average luminance. Luminance can also be increased by using multiple color primaries (spatial multiplexing) or pulsed LEDs (temporal multiplexing). Finally, we review how light recycling can be implemented to convert polarization without increasing étendue.

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Section: Decreasing Losses In the Light Enginementioning

confidence: 99%

Design Methodology for High Brightness Projectors

Fournier

Rolland

2008

J. Display Technol.

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“…A variety of microdisplay technologies, including microelectromechanical systems (MEMS) [2,3] and liquid-crystal-on-silicon devices [4,5], are suitable for use in color-sequential projectors. The emerging availability of color-switchable solid-state illumination sources such as LEDs [6,7] and lasers [8] will further simplify singlepanel projectors. In addition to delivering higher performance at lower cost in established projection-display segments such as rearprojection television, these trends are enabling new categories of projection products including pocket projectors as well as projectors small enough to be embedded in cell phones and PDAs.…”

Section: Introductionmentioning

confidence: 99%

9.5L: Late‐News Paper: Scalable Sequential‐Color Display Without ASICs

Handschy¹,

Dallas²

2007

Symp Digest of Tech Papers

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A new microdisplay backplane architecture integrating digital frame buffers and pulse-width-modulation gray-scale drivers eliminates external electronics in sequential-color single-panel projection systems while lowering power and bandwidth, permitting scalability to high resolutions. It delivers 256 gray levels per color with a native gamma characteristic programmable to values from one to greater than two.

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“…Commercially available projection systems (although sometimes in the form of prototypes) have already been used in a variety of applications in the form of compact data projectors and rear-projection panel technology. 1,2 As far as avionic applications are concerned, 3 projection displays provide an attractive alternative to the older conventional direct-view panel displays (e.g., cathode-ray tubes and electro-mechanical displays) as well as to the more recently developed LCD and CRT units. In fact, projection-display technology not only has the readily apparent advantages of lower weight, volume, and power consumption but also permits compact high-performance systems to be properly tailored according to specific platform requirements while using commercialoff-the-shelf components such as organic light-emitting-diode microdisplays (OLEDs), liquid-crystal-on-silicon microdisplays (LCOS), and digital micromirrors devices (DMDs).…”

Section: Introductionmentioning

confidence: 99%

Microdisplay‐based optical module for avionic display applications

Musazzi¹,

Perini²,

Grassetti³

2007

J Soc Info Display

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Abstract— A new optical scheme for a LCOS‐based rear‐projection system utilizing an LED illumination source is presented. The proposed optical module could conveniently replace conventional aircraft panel instrumentation not only because it achieves major standard avionics application requirements, such as the capability to withstand mechanical shocks, high reliability, and weight and power‐consumption minimization, but also as a consequence of the fact that it allows the display image area to be properly matched to the shape of the instrument panel more easily than with conventional displays.

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61.3: LED Light Source for RPTV Applications

Cited by 4 publications

References 3 publications

Design Methodology for High Brightness Projectors

Design Methodology for High Brightness Projectors

9.5L: Late‐News Paper: Scalable Sequential‐Color Display Without ASICs

Microdisplay‐based optical module for avionic display applications

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