Fig. 8.2. Optical measurement system setup

Note 3: Definition of Response time:

The response time is defined as the LCD optical switching time interval between “White” state

and “Black” state. Rise time, Tr, is the time between photo detector output intensity changed

from 90%to 10%. And fall time, Tf, is the time between photo detector output intensity

changed from 10%to 90%

Black(TFT ON)

White(TFT OFF)

White(TFT OFF)

100%

90%

10%

0%

Display

Data

Note 4: Definition of contrast ratio:

The contrast ratio is defined as the following expression.

Luminance measured when LCD on the "White" state

Contrast ratio (CR) =

Luminance measured when LCD on the "Black" state

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