All light in a viewing room produced by sources other than the screen.

The numeric relationship between a screen's height and width.

A viewer's subjective response to luminance.

The numeric relationship between the brightness and the darkest portions of a Displaying expressed in foot-Lamberts as a ratio of Max:Min.

The area between the top, or the bottom, of the viewing area and the screen housing.

The fundamental unit of illumination representing the light intensity over a 1 square foot surface which is 1 foot away from a standard candle.

A unit of luminance equivalent to 1 lumen per square foot.

A measurement usually made perpendicular to screen center of the  from luminance transmitted by the screen, divided by the luminance radiating the projector.

High Definition Television in ratio 16 : 9

The distortion of the projected image when the screen is not perpendicular with the center line of the projected image.

Screen surface comprised of a geometric embossing pattern. The shape  of the  pattern affects view\angle performance and reflection of ambient light.

The measured brightness of a screen, expressed in foot-lamberts.

The black portion surrounding the viewing area of a screen.

The direction of an imaginary line extending from the center of the projection  lens through the screen's center.

The length of the projection beam necessary for a particular projector to produce an image of a specified size.

The angle from a specified viewing position to the center of the screen. It   is usually measured on the horizontal or on the vertical axis.

Light Charged Device. Save Technology used in TV and computer monitors.

Digital Light Panel. Adopted Texas Instrument IC Chip called "Digital Mirror Device" to achieve true colors image used in DLP Projector.