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30-inch LCD monitors

QFHD What I want to know is the dead pixel policy on that sort of thing. Seriously. You're looking at the equivalent of about three 19" monitors wide and two 19" monitors high -- 6 monitors stacked together in one large screen with the resolution that this implies. The pixel pitch is going...
- ChuckHsiao
- Post #18
- Oct 17, 2005
- Forum: Computer Building
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CMV CT-726D viewing angle

That seems more or less typical for TN panels. It is not any problem with the drivers etc. but with the panel technology itself. TN panels have worse vertical viewing angles (i.e. the angle at which images can be viewed "normally") than horizontal viewing angles, because manufacturers have to...
- ChuckHsiao
- Post #2
- Oct 17, 2005
- Forum: Graphics Cards
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I have no luck with LCDs

Actually the PSP is pretty well-known for having dead pixels. Just google for "dead pixels". I don't really like the term though, because many companies nowadays try to push the definition of "dead" as "dark-only" rather than both bright and dark (with bright ones being called "stuck pixels"...
- ChuckHsiao
- Post #5
- Oct 16, 2005
- Forum: Displays
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LCDs have refresh rates?

LCDs do have a refresh rate, but it is not anywhere near the important consideration that it is for CRTs. A refresh rate simply means how many times the image can be updated every second. So a 60 Hz refresh rate means that the monitor is capable of displaying 60 new images every second...
- ChuckHsiao
- Post #9
- Oct 14, 2005
- Forum: Displays
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Which LCD should I buy?

Uh, nope, that 19" has a pixel pitch of 0.294 mm. They simply wrote the spec wrong. All 19" monitors that are 1280 x 1024 have a pixel pitch of 0.294 mm. A 0.264 mm pixel pitch is for 17" monitors.
- ChuckHsiao
- Post #17
- Oct 14, 2005
- Forum: Displays
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Where are more widescreen LCD's?

Chi Mei's coming out with a widescreen 19" soon -- we'll see how that one goes.
- ChuckHsiao
- Post #4
- Oct 5, 2005
- Forum: Displays
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About LCD montiors...

Samsung's much-publicized zero pixel defect thing is only in South Korea. Where competition is fierce because the world's biggest two LCD manufacturers (Samsung and LG.Philips) are based in South Korea. Actually, I lied. Samsung also has a zero pixel defect policy in Taiwan I believe...
- ChuckHsiao
- Post #10
- Sep 26, 2005
- Forum: Displays
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17 inch vs 19 inch lcd

* Larger screen. Meaning easier-to-see text, better if you're watching movies from a distance, etc. Even though yes it is the same resolution as a 17". Along the same lines, some 19" monitors, even though they are limited to 1280 x 1024 pixel resolution, can display 1600 x 1200 resolution...
- ChuckHsiao
- Post #11
- Sep 26, 2005
- Forum: Displays
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Looking for an LCD for viewing images and office work

Well if you're looking to be able to see small text, then the lower the pixel pitch, the better. The thing is, though, pixel pitch is pretty much standardized based on size (same with resolution). Demand still exceeds supply enough that manufacturers haven't really branched out yet to...
- ChuckHsiao
- Post #6
- Sep 26, 2005
- Forum: Displays
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19" LCD Monitor for gaming <$300

Depends on your tolerance for dead pixels and whether or not you're willing to harass the company for the rebate if it doesn't come.
- ChuckHsiao
- Post #24
- Sep 19, 2005
- Forum: Computer Building
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LCD monitor technology

You can somewhat tell via the specs. Non-TN panels tend to have bigger viewing angles. TN panels have viewing angles of around 140 horizontal and 130 vertical for the regular ones, with 160 horizontal and 140 vertical for the better ones. Note that this is at a contrast of 10:1; if a...
- ChuckHsiao
- Post #8
- Sep 19, 2005
- Forum: Computer Building
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What's the contrast ratio on a CRT?

CRT screens simply don't emit light when it's black. Thus, the contrast ratio is theoretically infinite. However, CRT screens have glare problems, so if you're using any sort of lighting in your room, the "real" contrast ratio goes down really quick. If I remember right, it becomes around...
- ChuckHsiao
- Post #2
- Sep 18, 2005
- Forum: Graphics Cards
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2005fpw screen looks 'wet'

Do you mean that it looks somewhat grainy? The light that LCDs emit is polarized (this is what enables them to do their magic in the first place), which means that they are very susceptible to uneven film thicknesses. In other words, maybe your monitor really does need wiping off with a wet...
- ChuckHsiao
- Post #5
- Sep 15, 2005
- Forum: Graphics Cards
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LCD dead pixel return policies

It depends on the person. My first LCD had 2 dead pixels, quite noticeable, but they never bothered me. Having said that, many companies actually have stated policies more like the 8-10 range, which is ridiculous. Unfortunately, the American public ain't too interested in demanding changes...
- ChuckHsiao
- Post #6
- Sep 15, 2005
- Forum: Displays
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Warning: Screen door effect on 19" LCD monitors.

The pixel pitch doesn't necessarily have anything to do with the screen door effect. The pixel pitch simply refers the size of the pixels. The screen door effect is a result of the gap between pixels being large enough to be noticeable at regular viewing distance. I saw a Sampo LCD TV...
- ChuckHsiao
- Post #3
- Sep 15, 2005
- Forum: Displays
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how green is the green in the sRGB color space.

Eh remember that the whole color thing is somewhat subjective. I mean, what's green? If you look at a spectrum, it goes from yellow to some weird color to blue. How do you define where in it is considered the "greenest"? The guy just took some volunteers, asked them if they can see stuff...
- ChuckHsiao
- Post #2
- Sep 14, 2005
- Forum: Graphics Cards
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what is the typical color saturation of the RGB sub pixels of an LCD ?

This varies by manufacturer. In terms of NTSC standards (if I remember right, this is the color range of transmitted images for TV), there are already LCDs that have over 100% NTSC. However, generally speaking the typical LCD probably has around 75% NTSC. In terms of what the eye can...
- ChuckHsiao
- Post #2
- Sep 11, 2005
- Forum: Displays
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LCD prices

We're in the middle of a price war since around January 2005 or so (prices for 17-inch monitors fell from like $350 to like $200 in the span of a few months). Thus, as the amount in stock is depleted, yes we will see prices slowly increase. The increase is already happening, has been for the...
- ChuckHsiao
- Post #3
- Sep 11, 2005
- Forum: Displays
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Dead Pixels - do more occur/appear over time?

What I meant was to use your LCD heavily in the first few weeks. Stressing it out is just my own personal term for it (kinda like stress-testing a server or something). Basically if you use it a lot, you give it a chance to let problems develop. For all manufactured items, defects appear...
- ChuckHsiao
- Post #8
- Aug 28, 2005
- Forum: Graphics Cards
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What's the life expectancy of LCD light bulb?

Backlights last for a long time. Unfortunately, LCDs are still so new that we don't really know how long they last in practice (i.e. consumers reporting in the aggregate); however, manufacturer specs are I think like 40k hours or 60k hours or so.
- ChuckHsiao
- Post #5
- Aug 28, 2005
- Forum: Displays
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Do LCDs actually have liquid in them?

Yes, it's more or less a liquid. It's also more or less a crystal. Hence the term..."liquid crystal". It has some properties of both. If you smash your monitor, yes the thing can leak. However, it's sealed during manufacturing, so there's no need to worry about leakage. Also, it's not...
- ChuckHsiao
- Post #9
- Aug 28, 2005
- Forum: Displays
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Dead Pixels - do more occur/appear over time?

Stateside, Samsung's policy is more than 9 pixels needed for replacement. That means you need 10 or more. Of course, you can try to see if they'll be like Dell and replace for one for a good reputation. Interestingly enough, Hyundai used to have an awesome policy -- 3 dead pixels max. This...
- ChuckHsiao
- Post #6
- Aug 28, 2005
- Forum: Graphics Cards
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Good 19" lcd for dvd movies?

Look for MVA panel monitors. You can tell because those are usually advertised as 170 degrees in both horizontal and vertical directions for the viewing angle, at a contrast ratio of 10:1. Regular TN panels (which are the ones with viewing angle problems) have an advertised angle of 140 to 160...
- ChuckHsiao
- Post #5
- Aug 28, 2005
- Forum: Computer Building
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LCDs

http://forums.anandtech.com/messageview...atid=31&threadid=1664893&enterthread=y Refresh rate is important for CRTs because the higher the refresh rate, the less energy is given per flash (i.e. each flash doesn't have to be as bright), so there's less eyestrain. For LCDs, however, there is...
- ChuckHsiao
- Post #9
- Aug 25, 2005
- Forum: Displays
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What is backlight bleeding?

Call them and find out. Especially if it's within 21 days, since they're reputed to be really good about returns for any reason during that time frame.
- ChuckHsiao
- Post #12
- Aug 25, 2005
- Forum: Graphics Cards
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dell 2005 fpw question?

They're reputed to do that within 21 days of purchase. Their official policy however is more than 6 pixels needed for returns (and never mentions the 21 days thing). So better check for dead pixels quick once you get it.
- ChuckHsiao
- Post #11
- Aug 25, 2005
- Forum: Graphics Cards
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Need cheap flat panel recommendation

I'd recommend any CMV or Polyview monitor. That's the niche of the market that my former company (Amptron) goes for (disclaimer of course, I'm a former employee of Amptron). They rely on low prices and low overhead to do business, rather than mass marketing (which drives up prices) or mail-in...
- ChuckHsiao
- Post #4
- Aug 25, 2005
- Forum: Computer Building
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Testing an LCD monitor

Test for dead pixels (if you can return it with even one dead pixel). You'll want to stress out your monitor as much as you can to see if you got any, since few appear once the monitor is stressed. To do so, set it to maximum contrast, and let it warm up for a while. You should warm it up...
- ChuckHsiao
- Post #8
- Aug 25, 2005
- Forum: Computer Building
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Dell 2405 - LCD Dead or Stuck Question

Dell's official policy can be found here: http://support.dell.com/support/topics/...ument?dn=1018431&c=us&l=en&s=dhs&cs=19 "If you notice more than six (6) fixed pixels on your display, or if there are several fixed pixels in a small area of the screen, refer to the E-mail Dell section...
- ChuckHsiao
- Post #5
- Aug 25, 2005
- Forum: Displays
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LCD Washed out at bottom?

It's a viewing angle issue. That's how TN panels are. Don't believe the manufacturer's specs for viewing angles. They often post the angle at which the contrast is 10:1, when our eyes notice image degradation waaaaaaaaaaaaaaaaay before that (like say 100:1). Even worse, some manufacturers...
- ChuckHsiao
- Post #2
- Aug 22, 2005
- Forum: Displays
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Dell 1905FP: capable of 75hz at 1280X1024, but why is it not optimal?

Consider that 60 Hz means you're feeding the image data 60 times a second to the monitor. There are 1280 x 1024 x 3 = 3.93M sub-pixels. Each sub-pixel receives one byte of information a second. This means that at 60 times a second, your monitor has to take in 236 MB of information a second...
- ChuckHsiao
- Post #4
- Aug 22, 2005
- Forum: Graphics Cards
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Bought DVI card w/o knowing, what monitor to get?

I think you'd probably use up more money getting a DVI-VGA adapter + monitor than just a DVI monitor. There's also the thing about checking out whether or not the DVI means DVI-A (analog) or DVI-D (digital) or DVI-I (can handle both). For around $190 to $200, it should be fairly easy to find...
- ChuckHsiao
- Post #5
- Aug 22, 2005
- Forum: Computer Building
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Can an LCD suffer burn-in?

For LCDs the image is just more geared to one direction when it's there for a while. Kinda like a habit I guess. However, like habits, it can be "unlearned"; just leave it off for a while, or better yet, put a complementary image (i.e. reverse colors) on the screen for a while. Unlike CRTs...
- ChuckHsiao
- Post #14
- Aug 22, 2005
- Forum: Computer Building
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Need advice on flat panels for using AutoCAD

If you're just going with AutoCAD design work, then response times probably aren't going to be important. What will probably matter more though is contrast and possibly color quality. In that case I would recommend some sort of MVA or IPS panel; they have fewer viewing angle issues (so more...
- ChuckHsiao
- Post #2
- Aug 21, 2005
- Forum: Computer Building
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LCD refresh rates

They probably use some form of interpolation. If my understanding of the technology is correct, a CRT's dot pitch is measured (for shadow masks) in terms of the diagonal distance from like-colored dots (or sub-pixels), the individual RGB components. Each dot is a light-emitting unit that is...
- ChuckHsiao
- Post #18
- Aug 21, 2005
- Forum: Displays
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17" monitor

The CMV is made by Chi Mei Optoelectronics, the fourth largest LCD manufacturer in the world (Samsung is the largest). They're the original manufacturer of lots and lots of LCD monitor brands; CMV and Polyview however are their own brands. All CMV (and Polyview) monitors that are DVI-capable...
- ChuckHsiao
- Post #22
- Aug 20, 2005
- Forum: Computer Building
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How is LCD response time measured?

The official (ISO 13406) definition of response time is the time it takes to go from black (brightness = 0) to white (brightness = 255) plus the time it takes to go from white to black. Because of engineering constraints, you actually measure the 10% to 90% amounts of the transition (to remove...
- ChuckHsiao
- Post #15
- Aug 17, 2005
- Forum: Computer Building
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Just a thought on Dell Refurb monitors...

Uh Dell's dead pixel policy is 6 is allowed: "If you notice more than six (6) fixed pixels on your display, or if there are several fixed pixels in a small area of the screen, refer to the E-mail Dell section under Additional Information to contact Dell Technical Support." They're reputed...
- ChuckHsiao
- Post #4
- Aug 17, 2005
- Forum: Computer Building
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LCD refresh rates

The refresh rate is simply how many times a second the monitor is told to draw an image on a screen. Both CRTs and LCDs have refresh rates. However, CRTs flicker their images, which means that refresh rate is very important (to reduce the effects of flicker). LCDs however are essentially...
- ChuckHsiao
- Post #6
- Aug 16, 2005
- Forum: Displays
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can someone explain refresh rates to me

Yes it can affect your gaming reflexes; people buy the fast LCDs specifically for this purpose. On the other hand, it just fuels manufacturers' incentives to find any way to deflate (heh) their response time numbers. Also, having a fast response time tends to mean sacrifices in color quality...
- ChuckHsiao
- Post #7
- Aug 15, 2005
- Forum: Computer Building

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