Waveshare e-Paper - Optical Characteristics; Specification

4inch e-Paper
User Manual
14
8. OPTICAL CHARACTERISTICS
8.1 SPECIFICATION
Measurements are under illumination 45/0, the detector is perpendicular to surface unless
otherwise specified.
Symbol
Parameter
Conditions
Temperature
Min
Typ.
Max
Units
Notes
R
Reflectance
White
25℃
30
34
-
%
8-1
CR
Contrast Ratio
-
25℃
15
22
-
-
T update
update time
-
25℃
-
12
-
sec
-
Symbol
Parameter
Conditions
Temperature
L*Typ.
a*Typ.
b*Typ.
△E2000
Max.
Notes
WS
White state L*/a*/b*
White
25℃
66.5
-4
0
6
8-1
DS
Dark state L*/a*/b*
Dark
25℃
12
7
-11
6
8-1
RS
Red state L*/a*/b*
Red
25℃
26.5
41
30
6
8-1
YS
Yellow state L*/a*/b*
Yellow
25℃
62
-11
65
6
8-1
BS
Blue state L*/a*/b*
Blue
25℃
34
3.5
-37
6
8-1
GS
Green state L*/a*/b*
Green
25℃
35
-22
15
8
8-1
Note 8- 1: Luminance meter: Eye-One Pro plus Spectrophotometer.
WS: White state, DS: Dark state, RS: Red state, YS: Yellow state, BS: Blue state, GS: Green state