A comparison of CRT and SED technology
Canon and Toshiba have teamed up to produce this new flat-screen
technology which will be superior to current displays available today.
The three main improvements are:
- Response time - slower response times
found on LCD displays can lead to ghosting.
- Contrast ratio - reported to be
100.000:1, the best LCDs currently only have a contrast ratio of 1000:1.
- Viewing angle - up to 180, LCD
screens can appear dark if they are not viewed straight-on.
SED (Surface-conduction Emission Display) works by using a thin film of
Palladium Oxide as an electron emitter which strike a layer of
phosphor, just like in a traditional CRT screen. Electrons are emitted
at each sub-pixel, and so higher resolution and contrast is achievable.
None of the problems associated with LCD screens should affect this
technology either because phosphors are illuminated instead of using a
backlit display as found in LCDs.
The greater clarity of these new displays will be ideal for
photographers and graphic artists, for whom colour accuracy is critical.
Canon hope to be able to market this innovation in the form of
televisions by winter 2007. Canon have refused to comment on when this
technology will be available for computer monitors, only saying, "There
are plans for production, but no details of (SED) monitors can be
released at this time.