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7. Random Access
Image 7-2
Example for Clamp position [trailing]
Field polarity The field polarity function is used for interlaced images. Both rasters of the image could be shifted in a
wrong way (double lines are visible in the image). This can be corrected by forcing the
field polarity to
[neg] or [pos]. Us e the ENTER key to toggle between [pos] and [neg].
Field select Default [both]
The field select is only used for interlaced imag es. O ne frame of an interlaced image contains two
fields, an even and an odd field. The choice exists to project [both] fields o n the screen or only the
[even] or [odd] field. This c an be useful for 3D projection. Use the ENTER key to toggle be tween
[both], [even] and [ odd].
Vertical refresh
[sync/asy n c]
The way of updating the image information on the LCD panels. Not a vailable for PAL-NTSC-SECAM
sources. This option will be displayed in gray.
• For s ources with a vertical frequency up to 60 Hz : the vertical refresh rate is th e s ame as the
vertical frequency of the incom ing sou rce. This is a necessity to project m oving im ages without
’motion artifacts’. For stationary images with a vertical frequency up to 60 Hz it is still possible
to use asynchronous refresh. When loading Pal, Secam, NTSC-files the synchronous mode is
default, for all other s ources below 60 Hz asynchronous mode is default.
• For sources w ith a vertical frequency higher that 60 Hz : the vertical refresh is different than the
vertical frequency of the incoming source. Synchronous refresh cannot b e used.
Vertical Sync Polarity:
[leading] or [trailing]
The vertical refresh can be synchronized with the leading sync edge or trailing sync edge. Default on
[leading]. Toggling to [trailing] is only necessary for special applications where t he trailing edge of the
sync signal has to be taken as a reference. Use the ENTER key to toggle between [leading] or [trailing]
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