Texas Instruments DW30 user manual Vertical and horizontal position, 1. Estimating Throw Distance

Section 2: Installation and Setup

Figure 2.1. Estimating Throw Distance

Vertical and horizontal position

The correct vertical and horizontal position of the projector in relation to the screen depends on the lens type and the screen size. Ideally, the projector should be positioned perpendicular to the screen. This way, the image will appear rectangular instead of keystoned (trapezoidal).

The vertical position of the image can be offset – that is moved above or below the optical axis (lens center) by adjusting the fully motorized lens mount using the keypad. The amount of vertical offset available depends directly on the lens installed in the projector and can be slightly limited if horizontal offset has been applied. Vertical offset can also be expressed as the percent of half the image height OR the number of pixels of shift from lens center. Refer to Figure 2.2 for some illustrated examples of vertical offset.

Table 2.1 along with Figure 2.3 show the maximum vertical offset of a lens or alternatively, how much of your projected image will appear above or below lens center if the maximum vertical offset is applied using that lens.

Table 2.1. Lens Offsets for DS+60 and Matrix 3000 (SXGA+)

Lens Type	Vertical Offset		Maximum amount of		Horizontal Offset		Maximum amount of
	(% of half height)		projected image above or		(% of half width)		projected image to one
			below lens center				side of lens center
	%	Pixels	%	Pixels	%	Pixels	%	Pixels
0.8:1 fixed	12%	+/-63	56%	+/-588	7%	+/-48	53%	+/-748
1.2:1 fixed	120%	+/-630	110%	+/-1155	78%	+/-546	89%	+/-1246
1.3-1.7:1	120%	+/-630	110%	+/-1155	78%	+/-546	89%	+/-1246
1.7-2.5:1	120%	+/-630	110%	+/-1155	78%	+/-546	89%	+/-1246
2.5-4.0:1	120%	+/-630	110%	+/-1155	78%	+/-546	89%	+/-1246
4.0-7.0:1	120%	+/-630	110%	+/-1155	78%	+/-546	89%	+/-1246

NOTES: 1) % Offset = # pixels of offset / half panel resolution x 100 2) Offsets are subject to ±7% centering tolerance.

2-6 Christie DS+60/DW30/Matrix 3000 User’s Manual 013-100149-02 Rev. 1 (01/07)