Data Sheet

www.waveshare.com
34／40
9. Optical characteristics
9-1) Specifications
Measurements are made with that the illumination is under an angle of 45 degrees, the detection is perpendicular unless otherwise
specified.
T =25℃
SYMBOL
PARAMETER
CONDITIONS
MIN
TYPE
MAX
UNIT
Note
R
Reflectance
White
30
35
-
%
Note
9-1
Gn
2Grey Level
-
-
DS+(WS-DS)xn(m-1)
-
L*
-
CR
Contrast Ratio
indoor
8
-
-
-
Panel’s life
0℃~40℃
1000000 times or 5 years
Note
9-2
Panel
Image Update
Storage and
transportation
Update the white screen
Update Time
Operation
Suggest update once every
24 hours or at least 10 days
to update again.
WS: White state, DS: Dark state
Gray state from Dark to White : DS、WS
m: 2
Note 9-1: Luminance meter: Eye – One Pro Spectrophotometer
Note 9-2: Panel life will not guaranteed when work in temperature below 0 degree or above 40 degree. Each update interval time should be
minimum at 180 seconds.
9-2) Definition of contrast ratio
The contrast ratio (CR) is the ratio between the reflectance in a full white area (R1) and the reflectance in a dark area (Rd)() :
R1: white reflectance Rd: dark reflectance
CR = R1/Rd
Display
θ
Ring light
Detector