BMW ON-BOARD MONITOR AND NAVIGATION SYSTEMS FOR E38 E39 E46 E53 Manuel d'utilisateur télécharger pdf (Page 44)

Mk-3 Navigation System On-Board Monitor with Widescreen Display Chapter 6 P.3

Course Contents/Background Material

De-energized polarisation

When there is no voltage applied, the individual liquid crystals

are helically twisted through 90º. If the light strikes the polari-

sation foil, the light will be polarised in one direction. The

polarised light electric field interacts with the LC molecule

electrons. The polarisation of the light rotates according to the

helical alignment of the LC molecules. The light can pass

through. There is no electrical field strength to align the LC

molecules.

Fig. 3: De-energized polarisation of the light (electrical field)

Index Explanation Index Explanation

1 Unpolarised light 3 Liquid crystals

2 Polariser with electrode 4 Polariser with electrode

KT-5855

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 56 57

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BMW ON-BOARD MONITOR AND NAVIGATION SYSTEMS FOR E38 E39 E46 E53 Manuel d'utilisateur Page 44