Dynamic scene index
Dynamic Scene Index (DSI) provided by the TV screen.
DSI is a rather specific parameter that can be called "visible framerate". Its appearance is due to the fact that a high frame rate is highly desirable for dynamic scenes — it provides smooth images and good detail of moving objects. However, for technical reasons, it is not possible to achieve indicators above 200 Hz in most screens. In order to remedy the situation, manufacturers use special technologies that create the effect of increasing the frame rate.
Such technologies may have different names, but they have the same principle of operation — inserting additional frames between the "own" frames of the video being played. And the dynamic scene index describes the overall effectiveness of such technology used in a TV. For example, a DSI of 200 Hz means that the image quality on the screen approximates a frame rate of 200 Hz, although the actual frame rate is often as low as 50-60 Hz.
In the most advanced models, the dynamic scene index can be up to 3000 Hz, and options above 3000 Hz are considered to be
TVs with a high dynamic scene index. However, it is worth noting that such specifications are more of an advertising ploy than a real advantage: in fact, the threshold for human perception is 400 – 500 Hz, a further increase in the DSI does not give a clearly visible improvement in the image.
Black enhancement
TV supports some kind of
black enhancement technology.
Deep blacks are as important to an image as the quality of other colours. At the same time, it is not as easy to achieve it as it might seem at first glance: the black areas of the screen are “lit up” by the backlight and, without additional tricks, may not look dark enough. Thus, modern TVs use various additional black enhancement technologies. One of the options for this technology is local backlighting, in which LEDs are placed not on the sides of the screen, but behind it: each of them illuminates its own section of the sensor and can be turned off if necessary. There are other, more complex ways to achieve high-quality black.
Sound power
The nominal power of the sound produced by the TV's sound system.
The larger the screen and the greater the estimated distance to the viewer, the more powerful the sound system must be in order to be heard normally. Manufacturers take this moment into account, moreover, most often they also provide a solid volume margin. So if a TV is bought for home viewing in a quiet, calm environment, you can not pay much attention to the sound power: it is guaranteed to be enough for such a usage. It makes sense to specifically look for models with high-power speakers for a noisy environment — for example, a cafe or other public space. Detailed recommendations on this matter can be found in special sources, but here we note that even in such cases, connecting external speakers can be a good alternative.
Number of speakers
The number of speakers installed in the TV.
Theoretically, one speaker is enough to work with sound, but most entry-level and mid-range models (as well as many premium devices) provide two speakers — for stereo operation, which allows to achieve some surround sound effect. And more than two speakers usually means the TV has enhanced audio capabilities such as a subwoofer or soundbar (see below).
HDMI version
About the interface itself, see above, and its different versions differ in maximum resolution and other features. Here are the options found in modern TVs:
— v 1.4. The oldest of the current versions, released in 2009. However, it supports 3D video, capable of working with resolutions up to 4096x2160 at 24 fps, and in Full HD resolution, the frame rate can reach 120 fps. In addition to the original v.1.4, there are also improved modifications — v.1.4a and v.1.4b; they are similar in terms of basic features, in both cases the improvements affected mainly work with 3D content.
– v 2.0. Significant update to HDMI introduced in 2013. In this version, the maximum frame rate in 4K has increased to 60 fps, and the audio bandwidth has increased to 32 channels and 4 separate streams simultaneously. Also from the innovations, we can mention support for the ultra-wide format 21:9. In the v.2.0a update HDR support was added to the interface capabilities, in v.2.0b this feature was improved and expanded.
— v 2.1. Despite the similarity in name to v.2.0, this version, released in 2017, was a very large-scale update. In particular, it added support for 8K and even 10K at speeds up to 120 fps, as well as even more expanded features for working with HDR. Under this version, its own cable was released — HDMI Ultra High Speed, all
HDMI 2.1 features are available only when using cables of this standard, although basic func
...tions can be used with simpler cords.External connectivity unit
An external electronic unit with connectors has several useful properties at once. Firstly, this solution allows you to remove secondary electronics from the TV case, thereby reducing its thickness. Secondly, the remote unit hides the wires connected to the TV (audio, video) as much as possible, since only one cable enters it. Thirdly, the external unit can be placed in a more convenient place for use in such a way that connecting the drive every time will not be a difficult task. However, this also manifests itself as a disadvantage, because. additional space is required for the external connector block.
To implement this solution, the leading TV manufacturers approached each in their own way. Samsung has a separate external module One Connect (Slim One Connect), which is solely responsible for communication. LG engineers have gone a step further and added this functionality to the soundbar.
Power consumption
The electrical power normally consumed by the TV. This parameter strongly depends on the screen size and sound power (see above), however, it can be determined by other parameters — primarily additional features and technologies implemented in the design. It is worth noting that most modern LCD TVs are quite economical, and most often this parameter does not play a significant role — in most cases, power consumption is about several tens of watts. And even large models with a diagonal of 70 – 90" consume about 200 – 300 W — this can be compared with the system unit of a low-power desktop PC.
