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3M Optical Systems
Dual Brightness Enhancement Film—Matte (DBEF-M)
Power Savings
Wide Viewing Angle
Vikuiti™ DBEF-M is a thin film reflective polarizer with an integral diffuser that increases
display brightness and is ideal for LCD notebook computer displays. It increases on-axis
illumination up to 100% by itself, and up to 250% when combined with two Vikuiti™ BEF
films, in wedge light guide designs. This increased brightness can be converted into
power savings.
Vikuiti DBEF-M offers combined functionality (illumination enhancement + diffusion). Its
unique surface properties soften cut-off and provide improved display uniformity while
reducing the need for a top diffuser/cover sheet. And the matte surface provides minor
cosmetic imperfection masking, eliminates wet-out and reduces reflective moiré.
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Vikuiti™ Dual Brightness Enhancement Film–Matte (DBEF-M)
How it works
Nominal film properties
Vikuiti™ DBEF-M works through polarization recycling. The diagram
shows a conventional backlit system emitting P1 and P2 light. A
Vikuiti™
DBEF-M
Vikuiti™
DBEF-M+
BEF II 90/50
Vikuiti™
DBEF-M+
BEF II 90/50
Crossed
On-axis Illumination:*
• Slab, increase
• Wedge, increase
53%
102%
121%
207%
160%
254%
Half Brightness for
Full Viewing Angle*
• Slab, Horz./Vert.
• Wedge, Horz./Vert.
122°/96°
56°/48°
101°/69°
47°/33°
58°/53°
29°/27°
Physical Characteristics
• Nominal Thickness
• Thermal Shrinkage, MD/TD:
• Thermal Expansion, MD/TD:
132µm (5.2 mils) (ASTM D2103)
0.3/0.3% (85°C, 15 minutes)
0.6/0.2% (85°C, 15 minutes)
Film properties
typical polarizer absorbs P2, but Vikuiti DBEF-M reflects P2 into the
backlight, where it is recycled into P1 and P2 light. With Vikuiti
DBEF-M, more P1 light is available to be transmitted through
the LCD, increasing on-axis illuminance by up to 53% for a slab
backlight and over 100% for a wedge light guide. Vikuiti DBEF-M
achieves additional on-axis illumination performance in a wedge
backlight display by redirecting available light to the viewer.
Conventional
Backlight Display
Display Enhanced
with Vikuiti™ DBEF-M
The technical data for the products described are typical, based on information accumulated during
their life, and are not to be used in the generation of purchase specifications which define property
limits rather than typical performance.
53% more light
Increases display
brightness by 53%
Top
Polarizer
Liquid Crystal
Display
Bottom
Polarizer
P1
P1
P1
Vikuiti™ DBEF-M in a typical LCD
P1
Vikuiti DBEF-M
P1
P1
P2P2
P1 P
P2
P2
P
*Vikuiti DBEF-M brightness gain depends on the backlight material composition, design and overall
lighting efficiency.
LCD
Vikuiti™
DBEF-M
P2 P2
Vikuiti™ BEF
Backlight
Vikuiti BEF
Diffuser
Light Guide
Vikuiti™ EDR
High End Notebook Display
Product Size Offering
• Custom Sizes—Converted to Customer Sizes
• Product Kits—30 Sheets 11N x 11N, 10 Sheets 17N x 17N
Brighter
brighter
Polar plots on standard 35.8 cm notebook PC wedge light guide
Display
Vikuiti™ DBEF-M & Two Crossed BEF II 90/50
Vikuiti™ DBEF-M
Brightness
increase with no viewing
angle loss
Bottom BEF
Top BEF
Reflective
Polarizer
none
none
none
Axial Luminance
(nt)
Maximum
Luminance
(nt)
Integrated
Intensity
(lm/m2)
Horizontal
1/2 Viewing
Angle (°)
Vertical
1/2 Viewing
Angle (°)
42.1
74.0
102.6
43.7
36.5
none
none
DBEF-M
84.9
102.3
183.1
55.5
47.5
BEF II 90/50
none
DBEF-M
129.1
136.6
177.9
47.4
32.7
BEF II 90/50
BEF II 90/50
DBEF-M
148.7
151.1
149.1
28.5
26.6
Eldim optical data taken on standard production 35.8 cm (14.1) notebook PC, TFT display, with wedge light guide with single CCFL and standard industry back reflector.
Vikuiti™ DBEF-M Horizontal Scan
Vikuiti™ DBEF-M Vertical Scan
160
160
140
140
120
100
XBEF II 90/50, DBEF-M
80
BEF II 90/50, DBEF-M
60
DBEF-M
40
Display
20
-80
-60
-40
-20
0
0
20
40
60
80
Luminance (nt)
Luminance (nt)
120
100
XBEF II 90/50, DBEF-M
80
BEF II 90/50, DBEF-M
60
DBEF-M
40
Display
20
-80
Viewing Angle (deg.)
-60
-40
-20
0
0
20
40
60
80
Viewing Angle (deg.)
Vikuiti™ DBEF-M Environmental Effects on Color
Vikuiti™ DBEF-M Environmental Effects on Gain
(Delta x, Delta y)
1.60
0.010
65°C/95% RH, 0deg delta x
0.008
65°C/95% RH, 60deg delta x
85°C, 0deg delta x
0.006
85°C, 60deg delta x
0.004
-40°C, 0deg delta x
-40°C, 60deg delta x
1.50
XBEF II 90/50, DBEF-M
BEF II 90/50, DBEF-M
DBEF-M
Display
1.45
Color Shift
Illumination Gain
1.55
0.002
-40°C to +85°C, 0deg delta x
-40°C to +85°C, 60deg delta x
0.000
-0.002
T=0 hours
500 hours
85°C, 0deg delta y
85°C, 60deg delta y
-0.006
T=0
T=1000 hours
Hours
65°C/95% RH, 0deg delta y
65°C/95% RH, 60deg delta y
-0.004
1.40
1000 hours
-40°C, 0deg delta y
-0.008
-40°C, 60deg delta y
-40°C to +85°C, 0deg delta y
-0.010
Hours
-40°C to +85°C, 60deg delta y
Important Notice to Purchaser
The following is made in lieu of all warranties, express or implied, including any implied warranties of merchantability or fitness for a particular
purpose. 3M warrants that, at the time of shipment, product will meet 3M’s published specification or that specification agreed in writing between 3M and
purchaser. Should product not meet specifications at time of shipment, 3M will replace or refund the purchase price of such quantity of the product found not
to meet specifications. Purchaser shall determine the suitability of the 3M product for purchaser’s application. 3M shall not be liable under any legal theory,
including in contract or in tort, for any injury, loss, or damage, whether direct, indirect, incidental, special or consequential, arising out of the use of or the
inability to use the product. The warranties and remedies set forth herein are purchaser’s sole and exclusive warranties and remedies.
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Optical Systems Division
3M Center, Building 235-1E-54
St. Paul, MN 55144-1000
1-800-553-9215
For more information, visit our website
vikuiti.com
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are trademarks of 3M.
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© 3M 2008. All rights reserved.
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