A device which displays this logo is capable of supporting the picture resolution and wider bandwidth required for High Definition pictures.
In the case of a display such as a plasma or LCD television, this will mean that the screen has the resolution (the level of image detail) to render High Definition images properly. Some screens are merely High Definition compatible - this means that they will accept a high definition signal, but only render the picture in standard definition. This is not the same as HD ready. If you are looking for future-proofing and the best picture, your screen should be "HD Ready".
Source devices such as DVD players with the logo will deliver a High Definition resolution image, usually by upscaling standard definition images to the better format. Other sources of High Definition programming include the BBC’s service & Sky’s subscription services, both currently available via satellite, while in the future, High Definition will be available via the new digital TV platform, "Freeview" and from "Blu-ray" disc players.
Devices such as AV receivers can also be "High Definition Ready" if they have video switching which supports the increased bandwidth required to carry a high definition signal (typically via HDMI or component video connections)
Component video is a picture signal format. Component video inputs are most commonly found on plasma, LCD screens and projectors as the format supports a high-bandwidth, suitable for High-Definition signals.
HDMI: High Definition Multimedia Interface. The HDMI connector is a digital interface which has global backing as the universal digital connector for home entertainment products. Capable of carrying a very large data rate, it is ideal for the latest generation of High-Definition sources and displays, it can carry picture, sound and other information between the latest generation of DVD players, plasma screens, computers and more - with the best performance yet.
DTS-HD is a system for delivering extremely high-quality multi-channel audio. It takes advantage of the larger capacity afforded by formats such as Blu-Ray and HD-DVD, delivering sound quality which DTS claim is equal to the studio master recording. It does this using lossless encoding which, unlike many existing formats, ensures that there is no reduction in audio quality. It can support any number of audio channels, although when used on Blu-Ray and HD-DVD discs, is specified to support up to 8 channels (7.1) of digital audio.
DTS-HD can be carried from a compatible player via an HDMI cable. AV receivers with DTS-HD decoding receive the signal via HDMI, along with the video signal. Such receivers provide the decoding and amplification of the signal, whilst passing the video signal on to the display via an HDMI output.
DTS-HD signals output from a player are backward compatible with AV receivers that feature standard DTS decoding - you will enjoy the highest quality signal your AV receiver is capable of decoding from a DTS-HD source. In addition, some players feature built-in DTS-HD decoders, providing the benefits of superior fidelity with existing AV receivers.
Further reading: DTS HD web page.