ISO 13406-2

Area	ergonomics
title	Ergonomic requirements for activities with optical display units in flat design
Brief description:	Ergonomic requirements for flat screens
Latest edition	2003-12 (invalid)
ISO	13406-2

According to the international standard ISO 13406-2 , LCD screens have been classified according to the following criteria:

Luminance , contrast and color measured by the direction in which the observer is looking
Reflections and contrast in incident lighting
Image build-up time
Defects ( pixel errors )

ISO 13406-2 has been withdrawn since June 2006 and replaced by the ISO 9241 series of standards . In pixel class 1, errors may already occur in this.

Overview of pixel error classes according to ISO 13406

Pixel defect class	Error type 1 - constantly lit pixel	Error type 2 - constantly black pixel	Error type 3 - defective subpixel , continuously lit or continuously black
I.	0	0	0
II	2	2	5
III	5	15th	50
IV	50	150	500

The numbers mentioned relate to one million pixels. For a common 19 inch LCD with 1280 × 1024 pixels, the values have to be multiplied by approx. 1.3, i.e. H. 2.6 defective pixels are allowed in class II . In class II , 6 defective sub-pixels are allowed (3 sub-pixels = 1 pixel) or, according to error type 3, even 7 defective sub-pixels (5 × 1.3 = 6.5 rounded up 7).