Data Sheet

www.waveshare.com

21／25

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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

Reflectance

White

Note

9-1

2Grey Level

DS+(WS-DS)xn(m-1)

Contrast Ratio

indoor

Panel’s life

0℃~50℃

1000000 times or 5 years

Note

9-2

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 : When work in temperature below 0 degree or above 50 degree , we do not recommend because the

panel’s life will not be guaranteed

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