Knoll Systems LED1081 user manual Aspect Ratio Settings

Aspect Ratio			Aspect				Geometry of Projected Image
	Description		Ratio of	With Standard Lens				With Anamorphic
Setting			Source
					(1.7:1 Screen)			Lens (.5:1 Screen)
			Signal
	Letterbox mode
	scales (zooms in		16:9
	on) a 4:3 image lin-
Letterbox	early (by the same
	amount on all sides)
	to fill a 16:9 display,		4:3
	cropping the top and
	bottom of the image.
	4:3 Narrow linearly
	scales the source		16:9
	active image hori-
4:3 Narrow	zontally, so that a
	4:3 source has the
	correct aspect ratio		4:3
	when using an an-
	amorphic lens.
	Select Native to
	display the source
	signal in its native					1080i HDTV Image			1080i HDTV Image
	resolution, centered
	in the display area		16:9
	with no re-sizing or
	overscan.
	This means, for					720p HDTV Image			720p HDTV Image
	example, that 720p
Native	HDTV programs will
	display with unused
	pixels on all sides:
	320 on the left and
	right sides and 180						480i SDTV Image		480i SDTV Image
	above and below.
	With SDTV and		4:3
	EDTV sources, the
	LED1081 scales the					1024x768 PC Image			1024x768 PC Image
	image horizontally to
	achieve a 16:9 as-
	pect ratio.
		Table 4-1: Aspect Ratio Settings

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