Should I get an HTC Evo shift

HTC Evo 3D in the test: Taiwan can also use smartphones with 3D

Operation & display

Operation is of course primarily via the 4.3-inch S-LC display - the input is complemented as usual by the row of soft-touch buttons that perform common functions such as "Properties", "Back", "Home" and "Search" “Offers.

The display shows the attractive qHD resolution (540 × 960 pixels) and also supports autostereoscopic 3D, so that 3D content can be viewed on the device without any additional accessories. The said resolution is currently the premier class in the smartphone sector and has a positive effect on all kinds of activities - above all on surfing the web.

As with the Nintendo 3DS and the Optimus 3D, the 3D effect is made possible by the parallax technology, which in principle allows the effect of physical alternating images: On top of the display, which shows an image in a spatially offset manner, there is another layer that absorbs the light from neighboring pixels so that the eyes fixate on a different pixel each time. In the brain, the whole thing is put together to form an image, creating a sense of depth. The offset display means that the 2D resolution is halved, so that the corresponding content no longer benefits from the qHD resolution.

The halved resolution is not a real problem, because the corresponding content does not appear pixelated. Instead, even with the Evo 3D, due to the technology, the user tends to struggle to find the correct viewing angle at the beginning: In the first few minutes in particular, one feels repeatedly tempted to move something in the position of the device - closer to the eyes, slightly inclined , further away, etc. - to change in order to create the ideal viewing angle. According to the nature of technology, the latter is also important: If you hold the Evo 3D too diagonally or too close to your eyes, the image can become uncomfortably blurred.

In addition, the representation is perceived differently: Although the majority seem to be able to perceive the 3D effect, one also meets again and again with people who cannot find an ideal angle for themselves even after a long trial. Even if we never had a headache during our test, it should also be noted that watching 3D videos can certainly tire the eyes. Everyday, continuous use should therefore also be more of a rarity than the rule on the Evo 3D.

    • Sony Ericsson Xperia Play
    • Sony Ericsson Xperia Play
    • Sony Ericsson Xperia Play
Notes on viewing the display

We see D65 as the optimal white point, i.e. a color temperature of 6,500 Kelvin (K). According to the common definition, this corresponds to average daylight and is the white point of the common sRGB and AdobeRGB color spaces. A deviation of a few hundred to around 1000 K is still acceptable for mobile phones, but some displays - especially OLED models due to their design - are often in the range of 10,000 K for white and even more for gray tones, which is already noticeable as a clear blue cast . Many displays of smartphones and notebooks hit the white point of 6,500 K relatively precisely, but deviate significantly with a bluish cast in gray tones and other medium tones. This uneven gray balance is particularly noticeable when gray and white occur at the same time.

Compared to LCD technology, OLED screens have some special features, some of which are reflected in our measurements and require explanation. On the one hand, there is the well-known high contrast that is possible with OLED due to the self-luminous pixels - there is no backlight here, which is darkened to a greater or lesser extent by the panel, but a pixel controlled in black is actually completely black and does not light up. Since the contrast ratio indicates the quotient between the brightness of white and black, the contrast measurement for OLED displays theoretically results in a division by zero and thus an undefined result - in practice there is always a certain residual brightness due to scattered light and signal noise when measuring black at the measuring device, so that contrast results in the five-digit range are produced. Since the display of these contrast values ​​in the bar chart creates the misleading impression that the contrast would be visible many orders of magnitude better with OLED, we decided to display a maximum contrast of 5000: 1 and refer to this explanation. In everyday use, the difference is only clearly noticeable in very dark surroundings; in daylight, factors such as reflections on the display surface are much more important.

The second special feature is the relatively short service life of the blue light elements in OLED displays given the current state of the art. This prompts manufacturers to replace the classic RGB subpixel matrix with alternative arrangements in order to increase the service life of some displays. Samsung's “PenTile” matrix, for example, is known, the main feature of which is the enlargement of the blue and red subpixels - although their number is halved at the same time. This means that with the same nominal resolution, these displays have a lower number of subpixels than displays with the proven RGB matrix. Each pixel still has its own green subpixel, but shares the respective red and blue subpixel with its neighboring pixel. With the same nominal resolution, the whole thing leads to a lower actual resolution and to color fringes at contrasting edges, which above all can significantly reduce the legibility of text.

When looking at the display values ​​determined for the Evo 3D, apart from the 3D functionality, it becomes obvious that the test candidate apparently has the same panel as the Sensation with regard to the basic data. While it is enough for a very decent third place in terms of maximum brightness, the device disappoints in terms of contrast, just like its portfolio brother. The direct competitor, the LG Optimus 3D, clearly does a better job in this regard.

On the next page: Performance & Interface

  • Sasan AbdiEmailTwitter
    ... is primarily the author of video game reviews at ComputerBase.