Akai LCT3201ad Service Manual page 66

Definition of these measurement items is as follows:
*1) Definition of Contrast Ratio: ［ These items are measured using BM-5A (TOPCON) under the
dark room condition (no ambient light). ］
CR=ON (White) Luminance/OFF (Black) Luminance
*2) Definition of Luminance, Luminance uniformity, Contrast, and the Deviation of Color
Coordinate:
Luminance and Contrast: To measure at the center position "5" on the screen (NO.5), see
Luminance uniformity: Lw (MAX) and Lw(MIN) are the maximum and minimum luminance
The Deviation of Color Coordinate: To measure at the position "1~5" on the screen
192
384
576
Figure.8-1 below.
value measure at the position "1~5" on the screen (NO.1~5), see
Figure.8-1 and below show equation:
ΔLw ＝ [ (Lw(MIN)) / Lw(MAX) ] × 100%
341.5
(1,1)
1
3
Figure 8-1. Measurement Positions
(NO.1~5), see Figure.8-1 below.
1024.5
683
2
5
4
65
(1366,768)