Wondering which Television to buy, a plasma or an LCD ???
Here are some interesting facts that will give you all information about both technologies based on which you can
make a better decision.
Click on Plasma v. LCDnew
for more details.
LCD v. Plasma
Currently, flat TVs are created using two different technologies: plasma and Liquid
Crystal Display (LCD). The foundation of the plasma TV is over a million tiny glass cells that are
charged with a mixture of neon and xenon. Behind these cells are colored phosphors,
which are chemical compounds that emit light when energized. Each cell has three
phosphors; one red, one blue, and one green. When activated by an electrode,
the plasma cells emit invisible UV light. The UV light strikes the red, green
and blue phosphors on the back of the display and thus creates the pixels that
form the image you see on the screen.
LCD (Liquid Crystal Display) technology works differently. Liquid is suspended
between two transparent panels. Within the liquid are crystals that, when activated
by voltage, re-position themselves so that they either allow the light to pass
through the panel and or block the light. This process is similar to turning
on and off a million light bulbs. Fluorescent tubes behind the panels supply
the light source. Both the lit and unlit crystals create visible pixels that
cumulatively compose the image on the screen.
Pros and Cons of Each
Brightness
Brightness in LCD and plasma screens is typically expressed as candelas per
square meter (cd/m2). Typically, plasmas are listed at 500-700 cd/m2, but independent
reviewers say that that the brightness of plasma is closer to 100 cd/m2. Conversely,
LCD TVs typically get a brightness rating of 450 cd/m2, again when measured
independently.
Contrast Ratio
Contrast ratio is the measurement of the brightest white against the blackest
black that the TV can create. The higher the contrast ratio, the easier it is
to discern details on the screen. Current plasmas measure contrast ratios of
up to 3000:1. However, independent reviewers believe that measured in real world
viewing situations, contrast ratios for plasma TVs drop to approximately 200:1.
Conversely, LCD TV contrast ratios range from 350-450:1 when measured using
the same realistic standards.
Color Saturation
Color saturation describes the amount of grey in a color. The more grey, the
lower the saturation. Plasma has the advantage over LCD in the area of color
saturation because of it's method to light blocking. Plasma is able to completely
turn off pixels when not in use, so that no stray light dilutes the colors.
The way LCD technology works means that there is some stray light and therefore
obtaining true color is difficult.
Screen Size
Right now, the plasma market offers TVs as big as 60 inches, and no plasma TV
is available smaller than 32 inches. LCD screen sizes range from 13 inches to
46 inches, and because of manufacturing innovations, larger models are becoming
available every year. Look for LCDs to catch up in this area soon.
Viewing Angle
Historically, plasma TVs have had a larger viewing angle, at about 160º,
when measured against older LCD TVs. However, the newer model LCD TVs have viewing
angles up to 175º degrees.
Burn In
Burn in is what happens when an image stays on a plasma screen for an extended
period of time. LCD's are not at all susceptible to burn in. While Plasma TVs
are vulnerable, some newer plasma TVs have added features that combat it.
Lifespan
Typical plasma TVs have a life span of 20,000 to 30,000 hours, which equates
to at about 20 years of usage if you have the set on for 4 hours a day. The
lifespan of an LCD TV is typically 50,000 to 60,000 hours, or about 40 years
running 4 hours daily.
Response Time
Response time is the amount of time, measured in milliseconds (ms), that it
takes for a pixel to go from active to inactive and back to active again. Lower
numbers mean faster transitions and fewer visible image artifacts. Plasma TVs
were made to handle rapid movement on the screen more effectively. They can
have response times as low as 15 ms. LCD TVs started as PC displays, and so
the need to show fast movement wasn't critical; somewhere around 25 ms. LCD
manufacturers have been steadily improving their response times as the demand
for fast moving, full motion video has increased. Newer model LCD TVs can have
response times as fast as 16 ms.
Power Conservation
Because the crystals in LCD TV do not produce light, the technology is labeled
as "non-emissive," which means it does not give off radiation like
the CRT. Cold cathode light sources, like fluorescent tubes, which use only
a little power, are used to illuminate the image. LCDs also use less power than
plasma televisions, because plasma requires powering hundreds of electrodes
to stimulate the phosphors.
Conclusion
Knowing that flat TV is not going away, there is no time like the present to
start enjoying all the advantages that these new technologies. Check out Philips
line of Plasma and Flat TVs online today.
