為什麼很多電視只有1388x768 卻聲稱支持 1080i HDTV?
答案：
1080i vs. 1080p HDTV: should you care?
By David Carnoy
Executive editor, CNET Reviews
(October 24, 2005)
Every once in a while, when the reader e-mails keep piling up in my in-box, I feel the need to revisit a topic that I’ve already written about. In this case, the subject is HDTV resolution, and 1080p resolution in particular. This seems to be on everyone’s minds as we head into the holiday buying season and we’re faced with more HDTV buying choices than ever before. Not a day goes by without someone asking whether they should just buy a “standard” 720p/1080i set or step up and pay the extra bucks for a higher-resolution 1080p set. Or what it all means. And so, I’ve tried to condense the whole discussion into a neat, little cheat sheet. Read on for the quick and dirty lowdown on 1080p.
1080p TVs to check out:
HP MD6580n 65-inch DLP rear-projection
Sony KDS-R60XBR1 60-inch LCoS rear-projection
Westinghouse LVM-37W1 37-inch LCD
Samsung HL-R6768 67-inch DLP rear-projection
Mitsubishi WD-73727 72-inch DLP rear-projection
1. 1080p defined
1080p resolution–which equates to 1,920x1,080 pixels–is the latest HD Holy Grail. That’s because 1080p monitors are theoretically capable of displaying every pixel of the highest-resolution HD broadcasts. On paper, they should offer more than twice the resolution of today’s 1,280x720, or 720p, HDTVs, such as Samsung’s HL-P5085W. Some companies, such as LG, refer to these super-high-res of sets as ultra-HD, while others prefer to substitute true or full for ultra.
2. Why 1080p is theoretically better than 1080i
1080i, the former king of the HDTV hill, actually boasts an identical 1,920x1,080 resolution but conveys the images in an interlaced format (the i in 1080i). In a tube-based television, otherwise known as a CRT, 1080i sources get “painted” on the screen sequentially: the odd-numbered lines of resolution appear on your screen first, followed by the even-numbered lines–all within 1/30 of a second. Progressive-scan formats such as 480p, 720p, and 1080p convey all of the lines of resolution sequentially in a single pass, which makes for a smoother, cleaner image, especially with sports and other motion-intensive content. As opposed to tubes, microdisplays (DLP, LCoS, and LCD rear-projection) and other fixed-pixel TVs, including plasma and LCD flat-panel, are inherently progressive in nature, so when the incoming source is interlaced, as 1080i is, they convert it to progressive scan for display.
3. What content is available in 1080p?
Really, nothing at this point. Today’s high-def broadcasts are done in either 1080i or 720p, and there’s little or no chance they’ll jump to 1080p any time soon because of bandwidth issues. Meanwhile, some newly announced DVD players from Denon and NeuNeo (who?) are claiming to upconvert standard DVD movies to 1080p resolution, but that’s a far cry from native high-def content. More promising is the post-DVD future. There’s been a lot of chatter over whether the new breed of high-def movie players, Blu-ray or HD-DVD, as well as the upcoming Sony PlayStation 3, will output in 1080p. Allegedly, they will, but those players and recorders will be very expensive at first (more than $1,000), and they probably won’t hit more modest price levels until 2007 or even 2008. The PS3, on the other hand, is designed to be more of a mainstream product; we hope that means a price tag in the neighborhood of $500. It’s unclear, however, exactly what it will output in 1080p–games, Blu-ray movies, or both–or neither.
4. How much extra does a 1080p TV cost
Not surprisingly, you’ll initially have to pay a premium to get the latest and greatest technology. If you take a look at the product lines of Sony, Samsung, and Mitsubishi, you can see that, on average, you can expect to pay about $1,000 extra for the bump in resolution. For instance, take the Samsung HL-R6167 (720p resolution) vs. the step-up HL-R6168 (1080p). At buy.com, the 6167 is currently going for $3,500 while the 6168 is $4,500. Eventually, of course, the gap will narrow, but it’ll take a couple of more years for 1080p displays to become the standard.
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5. Why you should buy–or not buy–a 1080p set
While we haven’t posted any reviews of 1080p rear-projection sets yet–before you ask, we’ve requested review samples from most major manufacturers, and received some promises but no product yet–we have gotten early looks at several of the new models, some of them have been early, nonshipping units. These include HP’s MD6580N, a 65-inch 1080p DLP, and Sony’s KDS-R60XBR1, a 60-inch LCoS (SXRD) set that brings the technology from Sony’s highly regarded Qualia 006 down to a more-affordable price point. After seeing 1080p in action, we’ve come to some conclusions.
Obviously, the quality of the source material you’re viewing is very important, but so are screen size and how far you’re sitting from your TV. Indeed, our resident video guru, Senior Editor David Katzmaier, reports that the extra sharpness afforded by the 1080p televisions he’s seen is noticeable only when watching 1080i sources on a larger screen. Comparing a 50-inch 1080p DLP set to a 50-inch 720p DLP set, for example, he says you’ll be hard-pressed to notice more detail with 1080i sources, especially from farther than 8 feet away. Even if you can see the difference, it will be much less obvious than, say, the difference between DVD and 720p HDTV. Of course, performance will vary from set to set, and we’ll know more when we have a chance to thoroughly test more 1080p televisions.
Katzmaier also says that the main real-world advantage of 1080p is not the extra sharpness you’ll be seeing, but instead, the smaller, more densely packed pixels. In other words, you can sit closer to a 1080p television and not notice any pixel structure, such as stair-stepping along diagonal lines, or screen door effect. This advantage applies regardless of the quality of the source.
Another thing to consider: even if the display has a native resolution of 1080p on paper, it can’t necessarily display all 2 million-plus pixels in the real world. For example, the Sharp LC-45GX6U, a 1080p 45-inch flat-panel LCD, actually wasn’t as sharp as it claimed to be; it couldn’t resolve every line of a 1080i-resolution test pattern.
Finally–and this may sound weird–but many 1080p televisions don’t accept 1080p sources at all. In our experience, only the aforementioned HP can handle 1080p via its HDMI inputs–all other current 1080p HDTVs cannot. Instead, they upconvert 720p and 1080i sources to 1080p.
Oh, and I would be remiss not to mention computer connectivity. Those of you thinking of running your PC through a 1080p set should be aware that you may not necessarily get to use all that extra resolution–even if you have the right high-end graphics card. For instance, the Sharp set we tested allows you to max out at only 1,280x1,024 resolution while the less-expensive Westinghouse LVM-37W1, along with Samsung’s 1080p RPTVs and one series of high-end sets from Mitsubishi, accept true 1,920x1,080 resolution from a PC. We expect most 1080p HDTVs announced in 2006 to handle 1080p sources, but for now, that capability is rare.
The bottom line: if you’re thinking of going big, really big (a 60-inch screen or larger), the extra resolution may make it worth the difference–as long as you have a pristine, 1080i HD source to feed into the set. As to whether true 1080p sources from PS3, a Blu-ray deck, or an HD-DVD player look better–we’ll have to wait until 2006 to find out. Of course, it’s probably a good idea to buy–or wait for–a set that can accept a 1080p signal so that you’ll be able to make that judgment.
http://reviews.cnet.com/4520-6449_7-6361600-1.html
這台： (Toshiba 42" HDTV TRUE 1080p)
加上PS3 = 畢業後第一敗
[ 编辑 EGC 在 06-04-26 02:50 ]
[ 编辑 EGC 在 06-04-26 02:51 ]
EGC于2006-04-25写道:
為什麼很多電視只有1388x768 卻聲稱支持 1080i HDTV?
。。
一般电视都会写支持。。但是并不是等于完全100％分辨率1080i HDTV…
只是支持播放。。。。。。
对了。。。HDTV 720i已经很清楚了。。。
1080i的不敢想象。。。SKY的是1080的？？？
1080
一般 HDready的TV 其实都支持1600X1200
1200足够1080i了
1、解析度??]有用^720p或者1080i@拥谋硎痉椒ǎ720p或者1080i是l信的呙韪袷交蛘吆Q楦袷健
2、解析度只有煞N表示方法：法和D元法，峨行I而言，基本裼们罢撸PC行I而言，基本裼冕嵴摺
3、一裼1080I的信格式?V播的_魉徒o用舻D像最高水驶蛘叽怪苯馕龆却蠹s是700多（TVL/PH），而信格式720P的D像oB解析度不^1080I格式，因此，物理解析度1280x720的@示O渫耆蜻原1080i和720p@煞N格式的D像。
4. 1080i的?V播信到用舳说淖畲笏屎痛怪鼻逦戎挥700多/挝划面高度。
5、1080i比作540p然是荒的，但是1080i等同於1080p和720i等同於720p同右彩腔闹的。如果720p真的等同於 720i，那N槭颤N_不直接l送720i格式的信？FOX_槭颤N要l送525P格式的信而不是原?淼525I？要知道，l送隔行信比l送逐行信的成本要低得多。
6、其?以上@些}不H日，飧，的p方通常是熟悉PC的和熟悉TV的，@些}上的不同看法基本上源自於PC和TV?在不是一回事。
7、1080是呙栊担@是由信格式Q定的，但是陡粜呙瓒裕1080?K不是?H可以分辨的黑白l担需要乘以一小於1的S担@S到凶kellS担2:1隔行而言，kellS荡蠹s等於 0.7，所以1080i的垂直清晰度大s是56TVL/PH。
8、水是逦群拖到y的l有P，注意@不是Y料魉，而是D像的最高l率c最低l率的差值，在一L期龋D像?母哳l率到低l率化的次稻褪且l，化的次翟蕉啵l越大，可以分辨的黑白l翟蕉唷Ｄ壳?V播系y有裼25Mhzl的，也有裼30MHz的，1MHz大s可以a生29TVL/PH，裼25MHzr，水是逦染痛蠹s是725TVL/PH。@725是在水度等於面高度的鹊模绻16:9的信，其?H可分辨黑白l档褥72516/9=1288TVL。
9、DVD的解析度不是720480（NTSC系y而言），720480的含x是呙栊480行，每呙栊猩系牧炼热又720。DVD的解析度也根厦娴牡览碛算，NTSC系y而言，1MHzl大s可a生80l黑白l。
10、我在前面e的720i和720p，525i和525p的例子是榱苏f明1080i和1080p的不同，?K不表示真的有720i。下d的HDTV TS流，不管其本身是隔行的是逐行的，播放w和PC必⑺DQ成逐行才能@示，道理和播放DVD是一拥摹DVD原本是楦粜酗@示O的，因此PC （或者F在的逐行DVDC）在@示r，必首先做DE-INTERLACE恚欢恫煌囊lw，不同的去隔行演算法，原的D像效果是不同的，而且它都和原本得逐行像源不同。如果隔行和逐行是一拥模沁要什NDCDi什N？HDTV也是如此，除非到某一天，用舳督邮盏降母粜D像可以完全op的DQ橹鹦校t，裼酶粜魉秃椭鹦魉瓦是有^e的。
11、豆潭D元@示O涠裕伸恫淮嬖诟粜酗@示的}，因此，必入的隔行信做DE-INTERLACE恚览砗颓懊嬷v的PC@示相同。常到v1280720的@示O滹@示720P的D像比@示1080I的D像好，PI就是1080I的信做DE-INTERLACE很}s，如果入的是1080P的信，那N就只有RESIZE的}，而]有了DE-INTERLACE，效果肯定要好得多。就好比你有一台物理解析度 960540的投影C，你Q不檩入的720P信要做RESIZE，而感X比480P的D像要差，但是如果有720I的信，其效果就不一定比 480P好，道理和1080Ic720P在1280720物理解析度的固定D元@示O渖弦印
[ 编辑 shadowless 在 06-04-26 02:48 ]
这样子啊 
确实・・ 我的hdtv声称能支持1080i 但是作为显示器只能刷到768・・・ 
please note what the ‘i’ stands for…
1080 interlaced has a lower actual resolution= =
interlaced… 就是 x2的意思嗎？
那我覺得我這輩子不會買 LCD TV / Plasma 了
Dell and Apple 足了…
EGC于2006-04-26写道:
interlaced… 就是 x2的意思嗎？
那我覺得我這輩子不會買 LCD TV / Plasma 了
Dell and Apple 足了…
当我明白这个事实后··· 已经晚了···
1080i-Ready only means compatable: if you give it 1080i video signal, it can playback. But it does not garrantee the output is 1080.
看不懂 
就是说 他能放1080的格式 但是放出来的效果不是1080・ 
・・・・ ・・・
高手！ 
