HP L1940 User Guide

							
D

LCD Monitor Quality 
and Pixel Policy 
The TFT monitor uses high-precision technology, manufactured 
according to HP standards, to guarantee trouble-free 
performance. Nevertheless, the display may have cosmetic 
imperfections that appear as small bright or dark spots. This is 
common to all LCD displays used in products supplied by all 
vendors and is not specific to the HP LCD. These imperfections 
are caused by one or more defective pixels or sub-pixels. 
■	A pixel consists of one red, one green, and one blue 
sub-pixel. 
■	A defective whole pixel is always turned on (a bright spot on 
a dark background), or it is always off (a dark spot on a bright 
background). The first is the more visible of the two. 
■	A defective sub-pixel (dot defect) is less visible than a 
defective whole pixel and is small and only visible on a 
specific background. 
The HP display does not have more than: 
■	3 bright dots. 
■	5 dark dots. 
■	5 total bright and dark dots. 
■	No more than two adjacent (less than 25 mm edge-to-edge) 
defective pixels. 
User Guide	D–1 
 
						

							
LCD Monitor Quality and Pixel Policy 
To locate defective pixels, the monitor should be viewed under 
normal operating conditions, in normal operating mode at a 
supported resolution and refresh rate, from a distance of 
approximately 50 cm (16 in.). 
HP expects that, over time, the industry will continue to improve 
its ability to produce LCDs with fewer cosmetic imperfections 
and HP will adjust guidelines as improvements are made. 
D–2 User Guide