VELVET The High Contrast Simulation Projector June 1 st, 2016 FMPT Conference Berlin Air Show Sven Ziebart, Axel Krause
Content Gamma curve and contrast of a projector 1 Optical properties of 2 Digital Micromirror Devices (DMD) 3 The principle of double modulation 4 5 6 Properties of the VELVET Projector 7 8
Gamma curve reproduction and the contrast of a projector 1 0.9 0.8 0.7 0.6 s ity n0.5 te In 0.4 0.3 0.2 0.1 0 Intensity versus Gray value 0 50 100 150 200 250 300 Gray value Intensity Projector Contrast 2000 : 1 Projector Contrast 10000 : 1 Linear scale Gamma curve for γ = 2.2 (standard value in simulation industry)
Gamma curve reproduction and the contrast of a projector 1.E+00 Intensity versus Gray value 1.E-01 s ity n te In 1.E-02 1.E-03 1.E-04 1.E-05 1.E-06 1.E-07 0.1 1 10 100 Gray value Intensity Projector Contrast 2000 : 1 Projector Contrast 10000 : 1 Logarithmic scale Correct represantation of lowest gray levels requires a high contrast projector
Function principle of a DMD based projector dlp.ti.com DMD - Digital Micromirror Device (Texas Instruments)
DMD Digital Micromirror Device 12 12 Illustration of 2 landed mirrors Top down view of landed mirrors 0.9 WQXGA DMD Pixel size 7.56 µm dlp.ti.com
Ray bundles of a DMD dlp.ti.com
Contrast reduction by stray light DMD Illumination On Illumination of the complete DMD area Lens On state energy
Principle of double modulation Illumination DMD Imaging DMD Illumination Lens On state energy
Double modulation for DMD the Zeiss-Solution Relay system has only two optical active surfaces Includes a freeform surface No color aberration Image of a point < DMD Pixel Distortion < DMD Pixel
Velvet Gamma curve reproduction 1.E+00 Velvet - Intensity versus Grayscale 1.E-01 s ity n te In 1.E-02 1.E-03 1.E-04 1.E-05 1.E-06 1.E-07 0.1 1 10 100 Gray value Intensity True 10 bit resolution gamma curve reproduction allows pure electronic blending in dome application
Projection Lenses for Simulation Applications For WQXGA resolution (7.56 µm pixel size) Lateral color aberration < ½ Pixel
Color wheel Diameter 65 mm Segments 6 RGBRGB (Red Green Blue Red Green Blue) Speed 120 Hz (2subframes / frame) Motor Air bearing brushless DC motor Life time 300000 Start Stop cycles
Velvet specification DMD native resolution 2560 x 1600 Contrast Full on / off 2 500 000 :1 Light flux 1500 lm (Dual lamp system)
Advantages and Benefits: Very High Contrast: 1: 2,500,000 Full immersion Absolutly black picture background (black is black) Realistic night vision presentation
Advantages and Benefits: Accurate Gray Scale Performance Night vision training Attention to detail reproduction Faithfulness to the lowest gray level
Velvet Simulation Installations Application System type Number of channels Eurofighter (Germany) Full Mission Simulator Cockpit Trainer Transall / C-160 Collimator 5 120 Tornado (Germany, US location) Full Mission Simulator 30
Velvet development activities Night vision capability (IR channel) LED illumination Laser phosphor illumination
Key Advantages of Velvet Projector Highest contrast 1: 2,500,000 Optimal gray level gradation Stable brightness and color uniformity Upgrade to IR possible Modular design makes service easy No use of optical blending masks 10 bit internal blending solution for artefact free blending
Velvet Demonstration We invite you to visit the Velvet demonstration.