NL6448BC20-18D Ver la hoja de datos (PDF) - NEC => Renesas Technology

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NL6448BC20-18D

TFT COLOR LCD MODULE

NEC => Renesas Technology 

NL6448BC20-18D

4.10.2 Definition of contrast ratio

The contrast ratio is calculated by using the following formula.

Contrast ratio (CR) =

Luminance of white screen

Luminance of black screen

4.10.3 Definition of luminance uniformity

The luminance uniformity is calculated by using following formula.

Luminance uniformity (LU) = Maximum luminance from ① to ⑤

Minimum luminance from ① to ⑤

The luminance is measured at near the 5 points shown below.

106

320

533

80

①

②

240

③

400

④

⑤

4.10.4 Definition of response times

Response time is measured, the luminance changes from "white" to "black", or "black" to "white"

on the same screen point, by photo-detector. Ton is the time it takes the luminance change from

90% down to 10%. Also Toff is the time it takes the luminance change from 10% up to 90% (See

the following diagram.).

100%

White 90%

Luminance

Black 10%

0%

Ton

Toff

4.10.5 Definition of viewing angles

Normal axis (Perpendicular)

12 o’clock

θL

Left

θU

Upper

θR

θD

Lower

Right

DATA SHEET DOD-PP-0251 (6th edition)

23

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