BMW ON-BOARD MONITOR AND NAVIGATION SYSTEMS FOR E38 E39 E46 E53 Uživatelský manuál stáhnout pdf (Strana 51)

Mk-3 Navigation System On-Board Monitor with Widescreen Display Chapter 6 P.10

Course Contents/Background Material

The transflection principle

The transflection principle is used along with the reflection

principle for Ad-TFT displays which have been manufactured in

Ad-TFT technology.

In transmissive (lighting) LC display operation, more contrast is

achieved by using backlight. As the ambient light increases, the

backlight is overlaid by the reflective portion of the ambient light.

This leads to almost constant contrast.

The lighter the daylight, the more the luminosity of the backlight

is increased.

If the daylight decreases (e.g. in a tunnel, on night-time journeys)

the luminosity of the backlight is reduced.

The backlight is always in operation. It is controlled by the

photosensor according to the ambient light.

Fig. 1: On-board monitor control panel photosensor circled in white

The RGB transistors are controlled by a "colour matrix". The

corresponding image is displayed on the screen surface,

according to RGB transistor control.

The reflective layer consists of microreflective electrodes and

transparent electrodes.

The delaying film evens out colour shifts which occur as a result

of differences in speed of the light.

KT-5722

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BMW ON-BOARD MONITOR AND NAVIGATION SYSTEMS FOR E38 E39 E46 E53 Uživatelský manuál Strana 51