Product Specifications

6.2 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
6.3 Reflection Ratio
The reflection ratio is expressed as :
R = Reflectance Factor
white board
x (L
center
/ L
white board
)
L
center
is the luminance measured at center in a white area (R=G =B=1) . L
white board
is the
luminance of a standard white board . Both are measured with equivalent illumination source .
The viewing angle shall be no more than 2 degrees .
2.13inch e-Paper
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