Data Sheet

Product Specification
Ver 1.2 38 / 43
9-3) Reflection Ratio
The reflection ratio is expressed as:
R = Reflectance Factor
white board
× (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.
α
Viewing
direction
θ
12 o'clock
dirction 90°
3 o'clock
dirction 0°
6 o'clock
dirction 270°
9 o'clock
dirction 180°
9-4) Bi-stability
The Bi-stability standard as follows:
Bi-stability Result
24 hours
Luminance drift
AVG MAX
White state △L* - 3
Black state △L* - 3
.
2.7" e-Paper (B)