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Home
> LCD
LCD
- Liquid Crystal Display
Price
Range: $700 (under 20”) to $5,000
Sizes:
15” to 45” (Sharp to release 65” late 2005)
Things to keep in mind when buying
-
Make sure the LCD Display is HD, not ED
- Choose
models that are 720p or 1080p lines of resolution
- Make
sure that it has one or more DVI or HDMI (more is better)
- Contrast
Ratio 3000:1 or geater
- Brightness
600 cd/m² or greater
- Ask
to watch the LCD on a HD channel and standard channel to make
sure you like the picture quality of that model.
- Ask
for the remote and adjust the Picture and color settings.
- Once
you find the model you like, check online for information and
problems with model. Also see if another manufacturer offers a
better product for around the same price.
To
see how LCD works click
here
For more information on TV resolutions Click
Here
Overview:
Along with Plasma, LCD (liquid crystal display) technology represents
a revolution in television design: the truly flat TV. LCD flat-panel
displays typically measure around 3" in depth and are lightweight
enough to be mounted on a wall. LCD is a transmissive technology (as
opposed to reflective technologies like DLP and LCOS). Its light engine
streams high-intensity white light (provided by a series of fluorescent
tubes woven behind the screen surface) through tiny cells filled with
a liquid crystal material. Each pixel has three such cells - one each
for red, green and blue components of the signal. When an electrical
charge is applied to these liquid crystals, their molecular structure
shifts, modulating the intensity of the light that passes through
to the screen.
LCD TVs are available many sizes, from 10" standard-definition
models to widescreen HDTV showpieces of 45" or more. LCD also
comes in resolution displays of 720p, 1080i, and 1080p. LCD is a relatively
simple and inexpensive technology that has been around for a while
now. However, we don’t typically see very big LCD screens because
of quality control problems. The bigger the LCD is, the higher the
risk is for bad transistors. In fact, 40% of LCDs coming off the assembly
line must be thrown away. This doesn’t mean that one you pick
up from the store has a high failure rate. In fact, it’s quite
the opposite. Only in the manufacturing does the LCD have a high failure
rate. However, with new technologies coming out for manufacturing,
the failure rate is bound to go down. With the failure rate going
down, prices will go down too.
Advantages:
LCD technology produces an exceptionally bright picture that can
easily be viewed even in very bright conditions. The images are
characterized by outstanding sharpness in detail and rich saturated
colors. LCD TVs use relatively little electricity, run cooler and
more quietly than most plasma displays, and are essentially immune
to the "burn-in" problems that plague CRT-projection and
plasma TVs. Slim, sleek, and lightweight, they can be placed or
mounted almost anywhere in the home, including places where you
might not have considered placing a TV. In fact, they can easily
be transported from room to room (with the exception of the largest
screen sizes) for additional flexibility. No matter where you put
them, the latest models allow uninhibited viewing from angles as
severe as 170 degrees off-axis.
Disadvantages:
Due to its transmissive technology and the unintended leakage of
some light to the display, the LCD’s high brightness comes
at the expense of deep blacks. Hence, its typical contrast ratio
cannot match those produced by Direct View or even DLP sets. Early
iterations of the technology also had relatively slow refresh rates,
causing slight but noticeable blurring or smearing of fast-moving
images. However, the advent of advanced LCD variants like active-matrix
TFT panels has greatly improved performance. As of 2005, the “screen-door
effect” is almost nonexistent with HD LCDs over 40”.
Likewise, technological improvements continue to reduce the occurrence
of the "screen-door effect" caused by the distance between
the pixels in an LCD display, but it's still more apparent with
LCD than with LCOS, DLP or plasma displays.
To
see how LCD works click
here
For
more information on TV resolutions Click
Here
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