Projection Screens for Use in Uncontrolled Lighting
Projection Summit 2007, Session 4June 18, 2007
Bright View Microstructure Platform Technology
Human Hair
Capability to produce designs (optical microstructures) that no one else can Very precisely, over very large areas Enables new, higher performance products
0.1mm
1mm
Bright View Products
Product development in all major display technologies
Plasma
Projection
LCD
OLED
New classes of reduced-cost projectors means more and more projectors are used in1. More places with uncontrolled lighting
2. 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 screensHigh gain
Ambient rejection
Portable
Lower cost
Problems & Opportunities with Projectors
Objective Figures of Merit for Front Projection Screens
Gain Dimensionless ratio of the measured luminance of the screen material (numerator) and a white diffuse standard (denominator)
Vertical ½ Angle
The angle where the initial signal has declined to 50% of its’ original on-axis value
Horizontal ½ Angle
The angle where the initial signal has declined to 50% of its’ original on-axis value
Diffuse Reflectance – Source
This ratio shows us how efficiently the screen distributes the projected image back into ambient surround. This dimensionless ratio of a luminance signal of the projection screen (numerator) divided by a luminance signal of a white standard (denominator).
Diffuse Reflectance – Ambient
This ratio tells us how efficiently the screen distributes the ambient illumination back to the projection screen viewer. The dimensionless ratio of illuminance signal of the projection screen (numerator) divided by the illuminance signal of a white standard (denominator)
Ambient Rejection Ratio
This ratio of the previous two measurements (Diffuse Source/Diffuse Ambient) gives a convenient figure of merit of how well the screen rejects ambient illumination.
Why High Gain Screens Matter
Gain = 1 Gain = 3Screen
DiagonalScreen
Diagonal(4:3)" 25 50 100 500 1000 1500 (4:3)" 25 50 100 500 1000 1500
20 64.24 128.48 256.97 1284.85 2569.69 3854.54 20 192.73 385.45 770.91 3854.54 7709.08 11563.6230 28.55 57.10 114.21 571.04 1142.09 1713.13 30 85.66 171.31 342.63 1713.13 3426.26 5139.3940 16.06 32.12 64.24 321.21 642.42 963.64 40 48.18 96.36 192.73 963.64 1927.27 2890.9150 10.28 20.56 41.12 205.58 411.15 616.73 50 30.84 61.67 123.35 616.73 1233.45 1850.1860 7.14 14.28 28.55 142.76 285.52 428.28 60 21.41 42.83 85.66 428.28 856.56 1284.8570 5.24 10.49 20.98 104.89 209.77 314.66 70 15.73 31.47 62.93 314.66 629.31 943.9780 4.02 8.03 16.06 80.30 160.61 240.91 80 12.05 24.09 48.18 240.91 481.82 722.7390 3.17 6.34 12.69 63.45 126.90 190.35 90 9.52 19.03 38.07 190.35 380.70 571.04
100 2.57 5.14 10.28 51.39 102.79 154.18 100 7.71 15.42 30.84 154.18 308.36 462.54Gain = 5 Gain = 7Screen
DiagonalScreen
Diagonal(4:3)" 25 50 100 500 1000 1500 (4:3)" 25 50 100 500 1000 1500
20 321.21 642.42 1284.85 6424.24 12848.47 19272.71 20 449.70 899.39 1798.79 8993.93 17987.86 26981.7930 142.76 285.52 571.04 2855.22 5710.43 8565.65 30 199.87 399.73 799.46 3997.30 7994.60 11991.9140 80.30 160.61 321.21 1606.06 3212.12 4818.18 40 112.42 224.85 449.70 2248.48 4496.97 6745.4550 51.39 102.79 205.58 1027.88 2055.76 3083.63 50 71.95 143.90 287.81 1439.03 2878.06 4317.0960 35.69 71.38 142.76 713.80 1427.61 2141.41 60 49.97 99.93 199.87 999.33 1998.65 2997.9870 26.22 52.44 104.89 524.43 1048.85 1573.28 70 36.71 73.42 146.84 734.20 1468.40 2202.6080 20.08 40.15 80.30 401.51 803.03 1204.54 80 28.11 56.21 112.42 562.12 1124.24 1686.3690 15.86 31.72 63.45 317.25 634.49 951.74 90 22.21 44.41 88.83 444.14 888.29 1332.43
100 12.85 25.70 51.39 256.97 513.94 770.91 100 17.99 35.98 71.95 359.76 719.51 1079.27
Projector Output (Øv - Lumens) Projector Output (Øv - Lumens)
Projector Output (Øv) Projector Output (Øv - Lumens)
Øv → Εv → Lv
lm → lx (lm/m2) → nits (lm/m2/sr)power → power/area → power/area/solid-angle
On-Axis Illuminance of projector/screen-size/gain
Gain Trade-Offs
-2
0
2
4
6
8
10
12
-90 -75 -60 -45 -30 -15 0 15 30 45 60 75 90
Gain=1
Gain=2
Gain=3
Gain=4
Gain=5
Gain=6
Gain=7
Gain=8
Gain=9
Gain=10
One Dimensional Distribution of Luminous Flux at Various Gains
Collimated illumination source, focused to “∞”
Luminance meter
Integrating sphere creating diffused reflection
White diffused reflectance standard with known reflectance (99%)
1) Measure illuminance - reflectance standard (Irs)
3) Obtain Diffuse Reflectance Source DS = Is / Irs
2) Measure illuminance from SUT (Is)
Projection Screen (SUT)
Diffuse Reflectance Source (DS)
Photodetector
Satellite sphere containing 3000KHalogen lamp
diffuser
Integrating sphere creating diffused illumination
Luminance meter
White diffused reflectance standard with known reflectance (99%)
1) Measure illuminance - reflectance standard (Lrs)
3) Obtain Diffuse Reflectance Ambient DA = Ls / Lrs
2) Measure reflection from SUT (Ls)
diffuser
Luminance meter
Projection Screen (SUT)
Diffuse Reflectance Ambient (DA)
Competitive Analysis
For low & mid-luminance projectors in lighted rooms, screens must have high gain and an Ambient Rejection Ratio (ARR) above 1.3
Vertical Diffuse Diffuse DS/DACompany Measured Published Measured Published Measured Reflectance Reflectance [ARR]
Product Gain Gain 1/2 Angle 1/2 Angle 1/2 Angle Source Ambient (500Lux)
BVT SHGS Prototype 12/2006 8.14 19 8.5 0.53 0.27 1.99? 30" 4:3 Folding Screen 4.38 23 13 0.78 0.43 1.83BVT HGS Prototype 2 11/2006 4.43 30 15 0.61 0.42 1.45BVT SHGS Prototype 4/2007 6.83 19 13 0.69 0.50 1.38Co. D SN 2.50 14 13 0.49 0.36 1.36BVT HGS Prototype 3 12/2006 4.35 24 12 0.64 0.51 1.27Co. Dr High Contrast Gray 0.71 0.80 55 - 0.50 0.42 1.18Co. Dr HiDef Gray 0.82 1.00 49 - 0.53 0.45 1.18Co. S F- G3 0.93 1.25 28 28 0.34 0.30 1.13Co. S G-R 0.85 0.92 42 64 0.54 0.49 1.10Co. Da High Contrast Matte White 0.98 1.10 50 50 0.69 0.64 1.09Co. Da CV 1.11 1.30 44 45 0.71 0.67 1.06Co. Dr. M2XXX 1.82 2.20 18 - 0.78 0.75 1.05Co. Da High Contrast CV 0.89 1.10 48 50 0.62 0.59 1.04Co. Dr M1XXX 1.04 1.00 52 - 0.86 0.83 1.03Co. Da Matte White 0.95 1.00 60 60 0.86 0.85 1.00Co. Dr Matte White 0.92 1.00 56 0.80 0.81 0.99Co. V SS 2.31 6.00 28 19 0.74 0.75 0.98
Horizontal
Application Segments - US Front Projection Screen Market
Philips “Lifestyle” Application
Type Diagonal(inches)
Price(Retail)
Price per Ft-Sq.
Home
Cinema
Home
Theater
Conferen
ce Room
Educatio
n
Mobile
Professional
Portable Projection
Fixed Projection Screen 84 -120 $250-$3500 $8.50-$170 ü ü ü ü
Motorized-Retractable 84-210 $1000-
$6000+ $15-$100+ ü ü ü
Manual Retractable 84-210 $70-$2500 $7-$60+ ü ü ü
Large Portable 50-84 $100-$500 $10-$40 ü- ü- ü- ü-
Small Portable 30-40 $300-$500 $40-$60 ü ü
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
Philips “Lifestyle” Application
Type
Home
Cinema
Home
Theater
Conferen
ce Room
Educatio
n
Mobile
Professional
Portable Projection
Fixed Projection Screen ü ü ü ü
Motorized-Retractable ü ü ü
Manual Retractable ü ü ü
Large Portable ü- ü- ü- ü-
Small Portable ü üBV
T
TAR
GE
T
BRIGHTSCREEN FPS Target Segments
0.5 5 50 500 5000 500000
20
40
60
80
100
120
140
160
180Projection Markets By Size & Luminance
Projector Luminance
Scr
een
Dia
go
nal
Home Cinema
Home Theater
Personal Projection
ConferenceRoom
MobileProfessional
Education
BVT-FPS-BRIGHTSCREEN-30
BVT-FPS-BRIGHTSCREEN-50
BVT-FPS-BRIGHTSCREEN-70
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
New Screens for New Markets
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
Target Specifications
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