scope:

The scope of this document is restricted to transmissive liquid crystal display-modules using either segment, passive or active matrix and achromatic or colour type LCDs (see note). Furthermore, the transmissive modes of transflective LCD modules with backlights ON are comprised in this document. An LCD module in combination with a touch-panel or a frontlight-unit is out of the scope, because measurements are frequently inaccurate. Touch-panels or front-light-units shall be removed before measurement. Throughout the main body of this standard, an integrated backlight is assumed to provide the illumination for the measurements. Deviations from this (e.g. segmented displays without integrated backlights) may usually be handled in the same way as display modules with integrated backlight, if an external backlight is provided. However, in the case where one of the two situations should be handled differently, this will be specifically stated. NOTE Several points of view with respect to the preferred terminology on "monochrome", "achromatic", "chromatic", "colour", "full-colour", etc. can be encountered in the field amongst spectroscopists, (general-) physicists, colour-perception scientists, physical engineers and electrical engineers. In general, all LCDs demonstrate some sort of chromaticity (e.g. as function of viewing angle, ambient temperature or externally addressable means). Pending detailed official description of the subject, the pre-fix pertaining to the "chromaticity" of the display will be used so as to describe the colour capability of the display that is externally (and electrically) addressable by the user. This leads us to the following definitions (see also IEC 61747-6-2, Liquid crystal display devices . Part 6-2: Measuring methods for liquid crystal display modules . Reflective type): a) a monochrome display has NO user-addressable chromaticity ("colours"). It may or may not be "black and white" or achromatic; b) a colour display has at least two user-addressable chromaticities ("colours"). A full-colour display has at least 3 user addressable primary colours with at least 6 bits per primary colour (. 260 thousand colours). This standard shall be read together with the generic specification to which it refers. It gives details of the Quality Assessment Procedures, the inspection requirements, screening sequences, sampling requirements, and test and measurement procedures required for the assessment of liquid crystal display modules.