Philips HDTV user manual Sdtv Interlaced scan method1, Scan Mode

User Manual BDH5011

SDTV Interlaced scan method1

Vertical Res.2	: 480 lines
Horizontal Res.3	: 640 dots
Aspect Ratio 4	: 4:3 Wide

SDTV grade televisions and displays are capable of displaying a maximum of 480 lines using interlaced scan method. All resolutions higher than 480 lines must be reduced to 480 lines in order to be displayed.

1Scan Mode

Interlaced scanning is a method that creates a TV picture with alternating lines of information and is the cause of flickering. Progressive scanning is a method that creates a TV picture with consecutive lines of information that results in flicker-free picture quality.

2Vertical Resolution (Scan Lines) Vertical scan lines refer to the number of horizontal lines a TV or display can show to create an image.

As the number of lines increase, more information is displayed, resulting in better picture quality.

3Horizontal Resolution

Each horizontal line in a TV or display is made up of individual dots (pixels).The higher the number of pixels, the finer the TV picture becomes. Horizontal pixel measurements using today's technology can range from 250 for a VCR to as much as 500 for a DVD player.

4Aspect Ratio

Aspect ratio identifies the ratio of the TV screen's width over its height. A 16:9 aspect ratio refers to a wide-screen picture format, while a 4:3 refers to a standard TV format.

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