![]() We expected that the iPad 2 would have identical battery life to the original iPad, given that the battery is about the same size. With an identical contrast ratio, you are not going to see any real difference between the two iPads unless you are looking at them side by side. Rather than there being some sort of improvement, we would put this difference down to the occasional variations we see between individual backlights in displays like this. The interesting thing here is that both the blacks and whites are a little higher than the original iPad, but the contrast ratio is identical. Now that we have the black and white level, we can find the device’s contrast ratio, which is approximately 718:1. We measured the iPad 2’s black level at 0.54 cd/m 2, which isn’t bad for a portable screen: it’s about four times as bright as a deep black on a TV. If you need a makeshift flashlight, the iPad 2 will be more than happy to oblige. To put this in perspective, most LCD HDTVs output between 2-300 cd/m 2, and the Barnes & Noble Nook Color only managed to output 178 cd/m 2. The result will be very bright: about 381 candelas per square meter (cd/m 2 ). In order to get the highest contrast out of your iPad 2, you’ll have to turn off the automatic screen brightness feature and crank the backlight to its maximum. Apple didn’t upgrade the iPad’s screen this time around, but they are no doubt considering it. Interestingly enough, the iPhone 4 actually has a much higher dpi: 326. Since the screen’s resolution is 768 by 1024 pixels, that means you’re getting 132 dots per inch (dpi). The iPad 2’s screen measures 5.8 inches wide by 7.4 inches tall. Screen Size & DPIĪ screen’s dpi, or dots per inch, is important for creating sharp text and vivid colors: the higher the pixel density, the finer the details. In the real world, this means that you will see distracting reflections in the screen. We also found that the screen does little to soften the reflection, as the photos below show. We found that the iPad 2 reflected about 11 per cent of the light that hit the screen, which is somewhat on the high side. On this test, we measure the amount of light the screen reflects by using two kinds of light sources: ambient light and a direct light source. ![]() A reflective screen will get washed out by external light much more easily than an eInk display. ![]() One area where eInk has the advantage over LCDs is screen reflectivity. We found that that iPad 2’s screen performed about as well as its predecessor’s: it has a sharp, clear screen that produces crisp text and bright colors. To test legibility, we feed the device several test images (both text and illustrations), which we photograph, magnify, and examine.Īs you can see from the samples above, the iPad 2 has no legibility issues. While the iPad 2 works great under many lighting conditions, you’ll definitely run into problems when you run out of cloud cover. If you didn’t have that shade and were in direct sunlight, however, that would put you in the 100,000 lux range: the iPad 2 screen would be unreadable under these conditions. To put this number in perspective, it’s like standing in the shade on a sunny day: there’s no direct sunlight, but it’s still fairly bright. This test currently tests brightnesses up to 14,000 lux. Compare this performance to an eInk reader like the Amazon Kindle, and you’ll see the advantage the eInk technology has over LCDs. The backlit LCD lets it perform very well at lower light levels, but gets increasingly hard to read as the light levels increase. NOTE: The images above are shot with a variety of lighting sources, which may cause some color shift.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |