First Look: Viewsonic G Tablet and Tegra 2 Performance Previewby Vivek Gowri on December 9, 2010 3:04 AM EST
The slate computing market is about to explode, with a literal flood of new tablets releasing over the coming months. Many of them will be Android based, running Nvidia’s Tegra 2 SoC. Nvidia made a big deal about Tegra 2 back at CES 2010, but for some reason, it’s taken quite a bit of time for anything running the platform to hit the market. Finally, we have one - the Viewsonic G Tablet.
The Tegra 2-based Viewsonic G Tablet showing the Tap UI homescreen
The specs are pretty straightforward; we’ve got a 10” WSVGA display with LED backlighting, Android 2.2 with a specialized UI skin on top, a 16GB microSD card, 2.4GHz 802.11n, Bluetooth 2.1, a 27 Whr lithium ion battery, and the Tegra 2 SoC. The dual-core Cortex A9 is clocked at a nice, round 1 GHz, and there’s 512MB of LPDDR RAM on board. The GPU is Nvidia’s Ultra-Low Power GeForce GPU and there are separate HD video encode and decode blocks also onboard. But the big deal with Tegra 2, as Anand went over in his first look at the SoC, is Cortex A9. The A9 is an out of order architecture with a relatively short pipeline, so it should be significantly faster than the in-order A8 on a per-clock basis.
But before we get to the performance aspect, let’s give the tablet a once over. The Viewsonic is not the most interesting physical specimen, just a screen with a thin bezel around it. From the front, it looks nearly identical to the Galaxy Tab and any number of other tablets on the market. The sides are pretty plain, with volume buttons at the top and a dock connector and mic at the bottom. The left side has a mini USB port, a headphone jack, and a power jack, while there are speakers on either side. The back is filled with logos - Viewsonic, the gTablet logo, the American distributor’s logo, barcode, FCC ID, etc - but otherwise pretty plain. Build quality is actually pretty decent and the tablet has a pretty weighty feel in hand. There’s no flex anywhere, and while the casing doesn’t feel particularly high quality, it’s not low quality by any means. There are some touches in the industrial design that make it seem a bit cheap. The capacitive touch buttons are off-center and easy to press inadvertently, and the physical buttons are placed pretty haphazardly. One thing that really threw me off is the volume rocker, which is switched from the logical layout (volume up is the lower button, volume down is the upper button).
The Viewsonic (left) next to the Samsung Galaxy Tab, both on maximum brightness, to illustrate the viewing angles of both tablets
But for $399 for a Tegra 2 tablet, minor quibbles about build quality and industrial design are about what one should expect. I also expected a not-so-great screen, but not like this. I know that not everyone can splurge like Apple did and go for an IPS screen, but when you look at the TN panels in these and other tablets, it really does make sense. The problem isn’t contrast ratio, the 432:1 figure is actually pretty good for a netbook screen and much better than most small notebooks. It doesn't match the iPad's amazing 934:1 contrast ratio, but still, contrast is not the problem. Unfortunately, the max brightness is not that high at 186nits, which only exacerbates the terrible viewing angles. Something I’ve realized in using tablets - the viewing angles matter a whole lot more than they do in laptops. As is typical with widescreen displays, the horizontal viewing angle is decent, but the vertical viewing angle is pretty bad - anything more than 30 degrees off center and the screen completely washes out. If I try to lay it flat on my desk and use it like my iPad or the Galaxy Tab, it’s basically impossible to see anything on the screen. For a device with a usage model so heavily dependant on good off-center viewing angles, speccing a screen with poor viewing angles was a pretty big oversight.
Viewsonic's Tap UI landscape split keyboard in the revised browser interface
Viewsonic loaded their own Tap UI onto the G Tablet. It’s a decent looking UI, but it’s aggravatingly slow and makes most of the navigation through the OS pretty painful. As with most tablets, there’s no Market preinstalled on the G Tablet (Samsung is the exception here, since they have managed to work around the Android Market restrictions). However, the XDA developers forum is your friend - there’s a simple workaround to get Market and other Google applications enabled, and it’s also possible to disable the UI skin. We’ll go over the software package and hacking aspects of the G Tablet in the full review; for now just know that the preloaded UI is pretty terrible, you'll want to disable it as soon as possible.
The G Tablet (center) next to the Galaxy Tab (left) and T-Mobile G2 (right)
Our first impressions of the G Tablet, beyond the woeful viewing angles and the unfortunate UI skin, is actually that of a fairly usable budget tablet. The user experience is actually pretty decent once you get out of the main UI and into an app or a browser window, and the split keyboard in landscape mode is much better than expected. The tablet has a nice, weighty feel in hand, but if you're using it in landscape mode, it might feel a little heavy for one-handed operation. The touchscreen is responsive enough, though it doesn't feel quite as sensitive as the Galaxy Tab or the iPad. That could just be because of the overall sluggishness of the UI, but we'll see about that after I load the stock Android UI onto the G Tablet. We'll see, but at first brush it looks like the main problems with the Viewsonic are the screen and the UI. We'll have a full review later on with more complete impressions and battery life numbers, but for now, we'll leave you with a preview of Tegra 2 performance.
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melgross - Saturday, December 11, 2010 - linkRight now, AOLED displays don't use any less power than do LCD displays. That's a myth. It's also why most devices that use them tend to go for darker backgrounds. In the future, we'll have more efficient AMOLED displays, but not yet.
AMOLED displays are also subject to more problems due to heat. Sometimes they turn off outdoors when it's too hot.
synaesthetic - Monday, December 20, 2010 - linkAMOLED displays actually use significantly MORE power when displaying predominately white images, such as webpages.
My Samsung Vibrant gets pretty great battery life when doing almost anything except browsing the web. Combining the high power usage of the 3G modem and the Super AMOLED displaying a lot of white, I watch my battery indicator tick down by 1% every 2-3 minutes!
And this is with brightness one notch above the minimum setting.
neutralizer - Thursday, December 9, 2010 - linkThe NookColor has an IPS screen as well.
zorxd - Thursday, December 9, 2010 - linkyou know that some other smartphones, such as the Moto Droid, have an IPS display too?
Lonyo - Thursday, December 9, 2010 - linkAfter buying a TN LCD monitor with landscape and portrait modes, and trying to use it in portrait modes, it became very apparent to me how terrible some LCD panels can be.
I can't believe anyone would use a screen with terrible viewing angles on a device which could potentially be used in either orientation regularly. For me, the terrible viewing angles on my monitor don't matter much because 99% of the time I use it in portrait mode, but on a tablet it's unacceptable.
nikon133 - Thursday, December 9, 2010 - linkMakes perfect sense to me. On laptop/netbook, no matter if you hold it on desk, or on your lap, you can always change screen's angle independent to the surface computer is sitting on. But with tablet, screen is always in the same plane as the surface. In addition, keyboard and screen are always in the same plane for tablets - another reason why viewing angle on tablet will always have to compromise more than on laptop.
Chloiber - Thursday, December 9, 2010 - linkShould't Sony's SLCD be an option?
It looks really awful. I think viewing angles are much more important on tablets than smart phones. Smartphones are right in front of your head anyway most of the time, but with tablets it's a whole different story
Tegra2 performance looks nice, especially compared to Hummingbird.
strikeback03 - Thursday, December 9, 2010 - linkPersonally, poor TN screens even on featurephones drive me nuts. The one redeeming feature of my HTC Diamond is the screen quality, even though it is small.
per.lundberg - Thursday, December 9, 2010 - link"The Nexus One is roughly 50% faster than the EVO 4G with the same processor, which is probably due to the Sense UI overlay on the EVO instead of the completely stock UI on the Nexus One."
Can this claim be verified? If it's true then thats a BIG difference due only to the UI.
tipoo - Thursday, December 9, 2010 - linkThat is pretty surprising. I think there is a way to go back to the vanilla Android interface, is there not? Doing so and running that test again would verify or dismiss that claim easily.