Hi mccook!!
Please note: The following is for NTSC but it also applies to PAL. For
PAL, change the 480i/480p to 576i/576p.
As a first approach we can say that the "Progressive Scan" improves
the quality of the standard TVs to the computer's monitors quality:
"The introduction of Digital/High-Definition TV brings the progressive
scan technology which has been used in computer monitors for years.
Today's television can scan at double the frequency of the standard
NTSC television. Because much of today's analog broadcasts are
displayed in the interlaced format, manufacturers of these sets often
include a "line doubling" chip, which repeat the alternating lines to
fill the gaps between scan lines, giving the impression of a brighter
image."
From "HDTV FAQ - Digital TV Connections and Transcoders - Progressive
Scan the Display Process"
http://www.digitalconnection.com/FAQ/HDTV_3.htm
"Progressive scan" from Wikipedia, the free encyclopedia:
"Progressive scanning is a method for representing moving images on a
display screen, where every pixel is represented in each frame. This
is in contrast to the interlacing used in traditional television
systems (progressive-scanning devices are sometimes referred to as
non-interlaced).
Progressive scan is used in computer monitors. Usually video monitors
use a raster scan to order the placement of pixels of the frame of
video from left to right and from top to bottom at a given frame rate
(e.g. every 1/60 of a second)."
http://en.wikipedia.org/wiki/Progressive_scan
At the page "What Video Widescreen Entertainment - Progressive Scan"
you can see an image that shows the image quality difference between
Interlaced Scan (traditional) and Progressive Scan, take into account
the following paragraph:
"Although interlaced scanning produces perfectly good pictures, there
are some inherent problems with the system, many of which can be
exaggerated on larger displays. The main drawbacks are visible line
structure and flickering caused by rapid switching between the two
fields. Another drawback is 'combing' (also called 'staggering' or
'jaggies'), which occurs during camera movement when objects are in a
different position from field to field, lending them a staggered
appearance.
With progressive scanning the frames are not split into two fields of
odd and even lines. Instead, all of the image scan lines are drawn in
one go from top to bottom. This method is sometimes referred to as
'sequential scanning' or 'non-interlaced'. The fact that frames are
shown as a whole makes it similar in principle to the way film is
shown at the cinema."
http://www.whatvideotv.com/articles/frame.html?http://www.whatvideotv.com/articles/general/200112_progscan.shtml
I also strongly suggest you the reading of the following article from
the Panasonic website, after read it you will be well noticed about
what "progressive scan" means:
"Progressive Scanning Explained"
http://www.panasonic.com/consumer_electronics/dvd_players/progscan.asp
What Sharp tell us about this topic?:
"How does the AQUOS perform with progressive scan DVD players?
Utilizing the component video input(s), the V6U, V4U, B4U and S2U
series AQUOS are capable of displaying a 480p (progressive scan)
signal. This results in clear brilliant pictures with a more film-like
appearance."
http://www.sharpusa.com/products/TypeMoreFaqs/0,1084,127,00.html#8
"What do interlace (1080i) and progressive (720p) mean?
The "i" stands for interlaced and "p" stands for progressive. 1080i
and 720p represent two different methods used to display HDTV video on
a screen.
When video is interlaced, a single video frame only draws every other
line. If you numbered each horizontal line in a 1080i frame from 1 (as
the top line) to 1080 (as the bottom line), each successive video
frame alternates between drawing the odd-numbered lines and the
even-numbered lines. So, a display supporting a 1080i format may draw
all of the odd-numbered lines (totaling 540 lines) in one frame, then
draw the 540 even-numbered lines in the next frame. This format is
used by CBS and NBC.
A display supporting 720 progressive format will sequentially draw all
720 lines in each frame. You will notice a difference in picture
depending on whether the program is being shown using the progressive
or interlaced method. ABC and FOX use this format.
All V6U, V4U, B4U, and S2U series models are able to display a 480p
signal (progressive scan). The 30? and 37? V4U and V6U series models
are also able to display a HDTV 720p signal (progressive scan)."
http://www.sharpusa.com/products/TypeMoreFaqs/0,1084,127,00.html#10
After compare prices of the different AQUOS LCD-TVs I noted that the
"w/Progressive Scan" ones costs between 10% to 20% more than the
standard (interlaced) TVs.
For example, comparing two at Harvey Electronics (HarveyOnline.com):
-- SHARP LC20S2US $1,199.99 with progressive scan.
http://www.harveyonline.com/products/details.asp?sku=1660&auth=JPHXY&r=0&category%5Fid=1&subcategory%5Fid=1111224
-- SHARP LC20E1U $1,099.99 without progressive scan.
http://www.harveyonline.com/products/details.asp?sku=1443&auth=PKHUM&r=0&category%5Fid=1&subcategory%5Fid=1111224
My personal choice is the one with progressive scan, because the price
gap is relatively small and the improve of quality is worth it. But at
this point (after reading the lectures given in this answer) I think
that you have enough info to take yourself a good decision.
Additional references:
"HTPC FAQ - Home Theater PC the ultimate Progressive Scan DVD Player":
http://www.digitalconnection.com/FAQ/HTPC_2.asp
"Progressive-Scan vs. Interlaced":
http://www.users.muohio.edu/corsilcj/DVD_PvsI.htm
"What Is Progressive Scan? - An Explanation of Film-to-Video Frame
Rate Conversion for NTSC":
http://static.zoovy.com/merchant/limbictechnology/Progressive_Scan.htm
Search strategy:
Sharp "progressive scan"
"progressive scan"
I used the "Sharp - TV Finder" tool to find and compare AQUOS TV models:
http://tvfinder.sharpusa.com/finder.asp?cat=tv
I hope this helps you. If you need further assistance or if you have
troubles with some links, please let me know via the clarification
feature; I will gladly respond your requests.
Best regards.
livioflores-ga |
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