Vistron VIS042 42" Plasma Television 10000:1 With Pedestal Stand & Speakers - £699

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[B]Vistron VIS042 42" Plasma Television 10000:1 With Pedestal Stand & Speakers[/b]


The contrast ratio is a metric of a video display, defined as the ratio of the light intensity of the brightest possible color to the darkest possible color a display is capable of displaying simultaneously. The higher the contrast ratio, the better the display is.

Examples are 800:1, 700:1, and 500:1 from higher to lower capability. Infinite contrast ratios can be achieved by devices capable of emitting no light at all as their darkest color. Contrast ratio is most commonly considered in connection with transmissive displays, such as LCD, in which all pixels share the same light emitter, and manipulate the brightness of transmitted light individually. Technological challenges make it hard to design a mechanism to shut off 100% of transmitted light in these displays. Additionally, any optics in front of the matrix of light modulators that can potentially mix the light from different pixels, such as the lens of a DLP/LCD projector, will also degradate the contrast ratio.

Emissive display technologies - where all pixels emit light individually, such as Plasma , are capable of achieving a very good contrast ratio.
Poor contrast ratio manifests itself in the lack of true black, and in noticeably desaturated colors (the darker is the supposed color - the stronger is the desaturation).

It is also common to market only the dynamic contrast ratio capability of a display (when it is supported), which should not be directly compared to the static contrast ratio. A plasma display with a static 5000:1 contrast ratio will show superior contrast to an LCD display with 5000:1 dynamic and 1000:1 static contrast ratio when the input signal contains full range of brightnesses from 0 to 100% simultaneously. However they will be on par when input signal ranges only from 0 to 20% brightness.

Features

• Panel Resolution: 852 x 480
• Viewing Angle: 160
• Peak Brightness: 1000
• Contrast Ratio: 10,000:1
• 1 AV Input; 1 S-Terminal Input; 1 Y Cb Cr/Y Pb Pr Mux Input
• 2 x Nicam A2/Scart
• 200 Channels
• 20 Watts (2 x 10 watt per channel)
• Viewing Angle: Over 160 Degree
• 100 Programmable memory
• Plasma 42" 16:9 Screen
• 1000 Page Text