2007, Projection Screens for Use in Uncontrolled Lighting
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Slides from a talk I gave at Projection Summit 2007, Las Vegas, NV, June 18, 2007
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2007, Projection Screens for Use in Uncontrolled Lighting
- 1. Projection Screens for Use in Uncontrolled Lighting Projection Summit 2007, Session 4June 18, 2007
- 3. Very precisely, over very large areas
- 5. Problems & Opportunities with Projectors New classes of reduced-cost projectors means more and more projectors are used in More places with uncontrolled lighting Portable applications for business and recreation Conventional, vinyl-based front projection screens only work in dark rooms Recent advances in fixed screen technology offer some improvement in lighted rooms, but Are not portable Mis-priced for new markets Are not a mass market solution for projection screens in lighted rooms New projectors require new kinds of screens High gain Ambient rejection Portable Lower cost
- 6. Objective Figures of Merit for Front Projection Screens
- 7. Why High Gain Screens Matter On-Axis Illuminance of projector/screen-size/gain Øv -> Εv -> Lv lm -> lx (lm/m2) -> nits (lm/m2/sr) power -> power/area -> power/area/solid-angle
- 8. Gain Trade-Offs One Dimensional Distribution of Luminous Flux at Various Gains
- 9. White diffused reflectance standard with known reflectance (99%) Diffuse Reflectance Source (DS) Luminance meter 1) Measure illuminance - reflectance standard (Irs) 2) Measure illuminance from SUT (Is) Collimated illumination source, focused to “∞” Photodetector Integrating sphere creating diffused reflection Projection Screen (SUT) 3) Obtain Diffuse Reflectance Source DS = Is / Irs
- 10. 1) Measure illuminance - reflectance standard (Lrs) 2) Measure reflection from SUT (Ls) Luminance meter Luminance meter diffuser diffuser Satellite sphere containing 3000K Halogen lamp Integrating sphere creating diffused illumination Projection Screen (SUT) White diffused reflectance standard with known reflectance (99%) Diffuse Reflectance Ambient (DA) 3) Obtain Diffuse Reflectance Ambient DA = Ls / Lrs
- 11. Competitive Analysis For low & mid-luminance projectors in lighted rooms, screens must have high gain and an Ambient Rejection Ratio (ARR) above 1.3
- 12. Application Segments - US Front Projection Screen Market
- 13. Where BVT BRIGHTSCREEN Fits High-growth projector segments need screens designed for new applications BRIGHTSCREEN FPS serves these segments with High gain Good ambient rejection Portable Functional, elegant packaging BVTTargeT
- 14. BRIGHTSCREEN FPS Target Segments
- 15. New Screens for New Markets Leveraging Bright View Technologies’ Proprietary & patented microlens technology - create screen structures w/tunable gain & viewing angle Proprietary materials expertise to integrate ambient-rejecting materials Packaging to create elegant, portable front projection screens
- 16. Target Specifications BVT-FPS-BRIGHTSCREEN-30 Open - 30”D, closed - 15X2X1” Targeting Portable, ~100 Lumen, LED/DLP Projectors Standard Configuration: BVT SuperHighGain (SHG) Screen Optional Configuration: BVT HighGain (HG) Screen BVT-FPS-BRIGHTSCREEN-50 Open - 50”D, closed - 24X3X1.5” Targeting combined markets: business meeting, home movie viewing/small-group gaming Standard Configuration: BVT HighGain (HG) Screen Optional Configuration: BVT SuperHighGain (SHG) Screen BVT-FPS-BRIGHTSCREEN-70 Open - 70”D, closed - 48X4X2” Targeting Portable Home Theater Projectors Standard Configuration: BVT HighGain (HG) Screen Optional Configuration: BVT SuperHighGain (SHG) Screen
- 17. Contact: Don Hirsh, Business Development Manager Bright View Technologies, Inc. 5151 McCrimmon Parkway, Ste 200 Morrisville, NC 27560 USA www.brightviewtechnologies.com +1 (919) 228-4370 X360 dhirsh@brightviewtechnologies.com
Notes de l'éditeur
- Edward F. Kelley, Proposed Diffuse Ambient Contrast Measurement Methods for Flat Panel Displays, NISTIR 6738, National Institute of Standards and Technology, April, 2001Video Electronics standards Association (VESA) Display Metrology Committee, Flat Panel Display Measurements Standard, version 2.0, p. 139, June 1, 2001Robert Wood, Bing Shen, “Diffuse Ambient Contrast Measurement Procedure,” White paper – Bright View Technologies, Inc. may, 2007
- Room Light background – 50-500 LuxLCD TV 300-500 nitsLCD Monitor 175-250 nitsMD RPTV – 400-500 nitsThe luminous output of the projector is measured in lumens (power); the lumens when delivered to a particular area are measured in lux (lumens/ m2); the reflected luminous surface of a projected image is measured in nits (lux per steradian or power/area/solid angle). Lux and nits are not interchangeable, but are related.
- For light traversing a single semi cylindrical lens, gain can be modeled as a family of sinusoidal lobes, defined by the integral of -pi/2 to pi/2 of ncos theta for n=1to 10
- Rows = InfoComm Taxonomy of Screen TypesColumns = Phillips Taxonomy from talk of Theodor Scheerder PS06
- We need to stress that portability is only one of the attributes of the products we are creating.