Learn How A Rear Projection Tv Works by aihaozhe2


									Rear projection television or RPTV is the technology behind the modern day large
screen television display and until recently catered to consumers as the only option for
an affordable large screen TV experience.

Magnifying Details - How Does a Rear Projection TV Works?

As the name implies, RPTV uses a projector to magnify a small image from the video
signal onto a large screen. The projector uses a bright beam of light and a lens system
to project the image to a much larger size. The traditional TV setups are in some ways
similar to the RPTVs. The television box contains the projector inside and the
projector projects the image form behind the screen.

Different Projection System for RPTVs

CRT Projectors

The earliest RPTV technology, CRT backed RPTVs were the first to exceed 40 inch
screens. They were bulky and the picture was unclear at close range.

DLP Projectors

A DLP projector creates an image using a DMD chip, which on its surface contains a
large matrix of microscopic mirrors, each corresponding to one pixel in an image.

LCD Projectors

In these RPTVs, a lamp transmits light through a small LCD chip made up of
individual pixels to create an image.

RPTV Faces Stiff Competitions from LCD and Plasma

The weight of earlier RPTVs required it to be wall-mounted, and though most
consumers dont wall mount their sets, the ability to do so is considered a vital selling
point. The modern-day rear projection TVs have a smaller footprint than their
predecessors and the recent models are lighter. But RPTVs still fall short compared to
the latest LCD and plasma flat panels which are lighter with superior picture

While popular in the early 2000s as an alternative to more expensive LCD and plasma
flat panels, the falling price and improvements to LCDs have led to Sony, Philips,
Toshiba, and Hitachi planning to drop rear projection TVs from their lineup. Currently,
Samsung, Mitsubishi, ProScan, RCA, Panasonic, and JVC RPTVs remain in the

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