ABOUT LCD TV's
LCDs Liquid crystal displays
so prevalent, in fact, that most people couldn't get through their day without
using one. This technology is utilized in digital clocks, microwave ovens, car
dashboards, calculators, stereos, thermometers etc. The applications for liquid
crystal displays are almost limitless, so it should come as no surprise that
this technology has revolutionized the most basic home appliance of all-the
television set. Liquid crystal technology has given birth to those slim, cool-looking,
bright displays that are popping up everywhere from bank lobbies to living rooms.
But how does it work? What makes a crystal "liquid"? The twisted nematic (TN)
liquid crystal is the most common type of liquid crystal being used in display
applications today (e.g., LCD televisions, LCD monitors, and LCD projectors).
It has a naturally twisted crystalline structure. A particular feature of this
crystal is that it reacts to electric currents in predictable ways-i.e., by
untwisting to varying degrees depending on the voltage of the current to which
it is exposed.
LCD monitors work by blocking light. By sandwiching a solution of TN liquid crystals between two perpendicularly aligned panes of polarized glass, it becomes possible to manipulate the intensity of light as it passes through this crystalline matrix and out the glass panel at the other end. Depending on the voltage of the electrical charge running through them, liquid crystals will untwist so that the intensity of light able to pass through the second polarized pane is affected. Basically, these displays can switch between light states (where the liquid crystals are fully twisted) and dark states (where the liquid crystals are fully untwisted), or somewhere along the gray scale in between.
A liquid crystal display consists of an array of tiny segments-called
"pixels"-that are manipulated to form images or to present information.
Addressing is the process by which pixels are turned on (which disables the
passage of light) and off (which enables the passage of light) so as to create
an image on the polarized display pane in front of you. So-called active-matrix
LCD TVs employ thin film transistors (TFTs), or tiny switching transistors and
capacitors arranged in a matrix on a glass substrate, to direct electric charges
down columns to reach a particular pixel. This, in turn, causes the liquid crystals
to untwist and "display" a predetermined amount of light generated
by the light source-usually a florescent bulb-in back of them.
The light source in an active-matrix LCD
monitor is a florescent bulb, which emits white light through a polarized
glass pane behind the liquid crystal solution. Theoretically, then, you can
start with a white display: This is one where its liquid crystals are completely
twisted and therefore able to direct the full spectrum of light out through
the polarized display screen in front of you. Since all wavelengths can pass
through, the full spectrum of light can be manipulated to create the desired
color. To achieve a full color pallet on your LCD display, each pixel is divided
into three subpixels-red, green, and blue-that work in conjunction to determine
the LCD pixel's overall hue. These subpixels are created by subtracting certain
wavelengths, and the color(s) corresponding thereto, using special filters.
By exploiting a combination of red, green, and blue subpixels of various intensities
(or gray scales), a single pixel triad can reproduce approximately 16.8 million
colors.
TYPICAL SPEC
Sony KDL-V32A12U High Definition LCD TV Other products by Sony Other
LCD Televisions AVAILABILITY: This item is usually dispatched within 24 hrs
(In Stock) In stock, available for next-day delivery. HIGH DEFINITION DIGITAL
LCD TV True Style. Unbelievably Realistic 'V' Series Cosmetically stylish and
compact. These TVs benefit from Sony’s award winning high resolution WEGA Engine
image processing. A system specifically designed for Sony flat panel televisions.
It provides more natural colour, sharper detail and superb clarity. A truly
realistic picture from an integrated digital ‘Freeview’ tuner, add Dolby Virtual
ProLogic II sound capabilities and the ability to receive High Definition broadcasts
via the HDMI input and you have an unbelievable TV. That’s all unbelievably
available today. Features: KDLV32A12U 32" Widescreen LCD High Definition Ready
Integrated Freeview tuner W-XGA panel 1366 x 768 High Resolution Image Processors
(Picture Enhancement System) 8-Day EPG 170° viewing angle Virtual Dolby ProLogic
II 3 x SCART (RGB) HDMI Input Component Input VESA Compatible Swivel base Dimensions:
(W x H x D) 810mm x 590mm x 110mm (For wall mounting, height 550mm without swivel
pedestal base)
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