Acer AL1913 AL1913 LCD Monitor Service Guide - Page 11

Luminance of center point: L=L(5) Brightness Uniformity Measurement points: Five specified points 1-5 Formula: Maximum [L (1), L (2), L (3), L (4), L (5)]/Minimum [L (1), L (2), L (3), L (4), L (5)] (3) Definition of Response Time (TR, TF): 100% 90% Gray Level 255 Gray Level 255 Optical Response 10% 0% Gray Level 0 TR TF Ti m e (4) Measurement Setup: The LCD module should be stabilized at given temperature for 20 minutes to avoid abrupt temperature change during measuring. In order to stabilize the luminance, the measurement should be executed after lighting Backlight for 20 minutes in a windless room. LCD Module LCD Panel Center of the Screen Photometer (TOPCON BM-5A) Field of View = 2 º 500 mm Light Shield Room (Ambient Luminance < 2 lux) 11