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SED Technology

How SED TV Works

SED technology is based on the now outdated CRT technology, but instead of using the single large CRT electron gun, SED technology will utilize thousands of smaller electron guns (emitters) to create the crisp picture that you see. Each pixel on the SED TV screen is made up of sub pixels (coloured red, green or blue). Therefore it will take 3 emitters to create every pixel on your screen.

Now for some maths:
The SED TV is expected to come at 1920 x 1080 pixels - this totals to 2,073,600 odd pixels with each pixel requiring 3 emitters which comes to a grand total of 6,220,800 emitters!

A diagram might make more sense to you now to compare CRT technology to that of SED:
SED TV Diagram
Image courtesy of HowStuffWorks.com

Comparisons

SED TV vs LCD
SED TV has a lot to offer over it's LCD counterpart. The LCD is known for it's poorer picture quality, although in recent times it is much improving. The LCD also has a highly directional backlight which limits its viewing angle across a room. This is not the case with SED TVs as they have their self illuminating phosphors. Although with this, LCD takes the cake as it is does not suffer from "burnt in" pixels like the SED TV does. If a pixel is left stationary for too long (e.g. a DVD menu), sometimes when you change channel, the DVD menu will still be visible! This is not a problem if you are careful to turn the TV off, or to make sure you don't leave anything on pause for long periods of time. As for power consumption, the SED TV is estimated to use about 2/3 of the power usage of the already efficient LCD display.

SED TV vs CRT
The main down side of a CRT display is it's sheer size. Due to it's single electron gun which needs to be set back far enough to cover the whole range of the screen. The SED TV can match the quality of the CRT, but only with a few inches of thickness! That is the main advantage the SED TV has over the CRT. Since they are based on the same technology, they share a lot of the same quality characteristics.




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