Data Sheet

Product Specification

Ver 1.2 37 / 43

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

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

Detector

Ring light

2.7" e-Paper (B)