Plasma Or Lcd Technology - What Is An Image?
LCD (liquid crystal display) panels form an image through a process of filtering light emitted by a light source or back-light
. Each pixel is made up of three shutters or sub-pixels and these subtract red, blue and green wavelengths from the spectrum. The closeness of the shutters is such that the eye perceives the color combination as a single coloured pixel.
LCD panels incorporate numerous cells or shutters filled with liquid crystals, in between transparent sheets. When the electrical charge to a shutter is altered, the liquid crystals within straighten, changing the amount of light passing through, therefore the shade and strength of colour of a pixel can be changed.
Efforts to overcome the problems in LCD TV pictures has led to the development of LED back-lighting. LED technology allows brighter, flexible lighting with better management over colour and contrast. Edge-mounted LED's have allowed LCD screens to be exceedingly thin.
Unlike LCD, Plasma screens are an emissive technology. every screen is constructed from hundreds of thousands of tiny inert-gas filled cells and when an electrical current is applied to them, they function like microscopic florescent bulbs.
Every colour pixel is constructed from three plasma gas cells or sub-pixels, lined with blue, red and green phosphors. The cells are microprocessor controlled and by altering the electrical charge to each one many times a second, the pixel's colour is produced.
CONTRAST AND BLACK LEVELS
The makeup of traditional LCD panels, directing a back-light through a filtering shutter layer, has made it complicated to achieve pure blacks because of light leaking inbetween pixels.
The arrival of LED back-lighting technology for LCD Enhanced has meant improved management over the position and intensity of light, leading to advances in contrast. such dynamic LED back-lighting permits localized darkening (except in edge-lit sets) and enhanced black levels. Such advances in combination with other panel technologies including polarizing filters, has led to contrast ratio's in the top LED LCD televisions nearing those of Plasma tv's.
Plasma technology achieves its high black-levels by virtue of 'turning pixels off' to render blacks. Although the cells are never completely extinguished, as they need to carry a pre- charge to enhance refresh rates, when combined with filtering glass technology Plasma TV's achieve very high contrast ratios and enhance detail in dark scenes.
Even with LED advances, LCD TV's do continue to be afflicted by a drop in contrast when observed from an angle. This is not as pronounced in more expensive models, it is an area in which Plasma sets still hold a lead.
COLOR ACCURACY
As well as providing a larger degree of contrast, Plasma has historically achieved richer and more natural coloration. The combination of base blue, red and green elements in each pixel facilitates faithful reproduction throughout colour spectrum.
LCD televisions represent colors as a result the manipulation of light waves, removing colors from a white light source. This approach to colour production mixed with inherent light leakage, have made accurate colour difficult to control and the range of colours have been less than that of Plamsa. Enhanced back-lighting and more recently LED technology have enhanced colour correctness.
Plasma TV colour richness and naturalness will dominate in environments with reduced to standard lighting - yielding a more realistic image. LED LCD TVs perform better in well lit environments as the panels are naturally more vivid.
VIEWING ANGLES
With plasma screens, every pixel emits its own light, allowing viewing angles of a topmost 180 degrees with no perceptable sacrificing contrast.
LCD TV companies have done much to increase viewing angles, panel substrate material on newer-generation LCD models increase viewing angles to approximately 120 degrees.
MOTION PERFORMANCE
Plasma technology produces magnificent motion performance without blur or motion lag of fast-moving images, with no judder when panning and with high contrast levels.
LCD TVs companies struggle with motion issues. Although the response rates of LCD TV's have improved a great deal, lcd televisions still endure slight motion blur. Issues can also be detected when the camera swings from side to side, appearing to judder.
The addition of 240Hz refresh timings has decreased motion lag in LED LCDs still further but at the cost of adding interpolated frames which make images feel distinctly unreal.
SCREEN BURN IN
Static images can begin to "burn-in" to Plasma panels or burn the colour on display into the glass display element. Improvements to anti-burn and plasma cell technology have increased the time it takes for this to occur.
by: FrankSteadman
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