Fig. 9.2. 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

Note 5: Definition of Luminance Uniformity

Active area is divided into 9 measuring areas (reference the picture in below). Every

measuring point is placed at the center of each measuring area.

Luminance Uniformity (U) = Lmin/Lmax x100%

L =

Active area length

W =

Active area width

Fig9.3.

Definition of uniformity

Note 6: Definition of color chromaticity (CIE 1931)

Color coordinates measured at the center point of LCD

Note 7: Measured at the center area of the panel when all the input terminals of LCD panel are

electrically opened.

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