Page 586 - (DK) The Ultimate Visual Dictionary 2nd Ed.

THE MODERN WORLD
Home cinema

BLU-RAY PLAYER
HOME CINEMA REPLICATES a real “movie theatre” using
Ventilated Display Open/close
pictures displayed on a high-quality widescreen television
case panel button
set, such as an LED TV, and surround sound from strategically
sited loudspeakers. The source for sound and vision is a DVD
(Digital Versatile Disc). Its player uses standard CD (Compact
Disc) digital technology, but with a higher density of laser-read
microscopic pits—more than 20 billion such pits in multi-level
spiral tracks that, stretched out, would extend nearly 25 miles
(40km). Blu-ray is a high-quality DVD system that fits
much more data on its disc than standard DVDs, allowing Play button
High Definition video files to be stored. It is hard for the On/standby button Disc tray Stop button
human ear to discern the direction of low-pitched sounds,
so these emanate from a central bass speaker, often DVD player Center sound
built into or below the screen unit. High-pitched under screen channel
HOW SURROUND SOUND WORKS
sounds, the direction of which is easier to detect,
emanate from mid- and high-frequency speakers Subwoofer Plasma
(bass unit) screen
positioned around the viewer. Light Emitting Diode
(LED) TVs shine LEDs through a Liquid Crystal Front left Front right
Display (LCD) panel. LCD screens are made up of sound sound
channel channel
millions of three-cell pixels, each containing a red,
green, and blue sub-pixel. These pixels are controlled Region
of most
by the liquid crystals in the display panel, which
Rear left realistic
regulate the light emitted by the LEDs. This allows sound
sound
all the different combinations of the three colors to be channel reception
produced, creating the image on-screen. Organic Light
Emitting Diode (OLED) TVs have an organic carbon-based Rear right
sound
layer that produces colored light. While traditional LED screens
channel
use several layers to make light and color, OLED screens have
just one, and can therefore be thinner and use less energy.
WIDE-SCREEN LED TV
Curved screen
HOW AN OLED SCREEN WORKS

Negative cathode The emissive
sends electrons layer transports
through OLED electrons from
the cathode to
the conductive
OLED layer,
Conductive and makes light
OLED layer
connects the
cathode to
the anode

The screen
surface shows
the light The transparent
produced. The positive anode sits
color depends under the screen’s
on the chemical surface
make-up of
the OLED Smart Hub

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