which significantly reduces the needed strength of the glass itself. A CRT has no place for similar reinforcements, so the glass at the front screen must be thick enough to support all the pressure. SEDs are thus much thinner and lighter than CRTs. SEDs can have a 100,000:1 contrast ratio. Comparison to LCD Televisions The primary large-screen television technology deployed in the 2000s was the liquid crystal display television; SEDs are aimed at the same market segment. LCDs do not directly produce light, and have to be back-lit using cold cathode fluorescent lamps (CCFLs) or high-power LEDs. The light first passes through a polarizer, which cuts out half of the light. It then passes through the LCD layer, which selectively reduces the output for each sub-pixel. In front of the LCD, shutters are small colored filters, one for each RGB sub-pixel. Because the colored filters cut out all but a narrow band of the white light, the amount of light that reaches the viewer is always less than 1/3 of what left the polarizer. As the color gamut is produced by selectively reducing the output for certain colors, in practice, much less light makes it through to the view--about 8 to 10% on average. Despite using highly efficient light sources, an LCD uses more power than a CRT of the same size. LCD shutters consist of an encapsulated liquid that changes its polarization in response to an applied electrical field. The response is fairly linear, so even a small amount of leaked power reaching the surrounding shutters causes the image to become blurry. To counteract this effect and improve switching speed, LCDs use an Active matrix addressing of transparent thin-film transistors to switch each shutter directly. This adds complexity to the LCD screen and makes them more challenging to manufacture. The shutters are not perfect and allow light to leak through, reducing relative brightness and color gamut. Additionally, the use of a polarizer to create the shutter limits the viewing angles where a visually indistinguishable contrast-ratio experience may be had. Most importantly, the switching process takes some time, on the order of milliseconds, which leads to the blurring of fast-moving scenes. Massive investment in the LCD manufacturing process has addressed most of these issues, but no single LCD-based solution has proven able to overcome all aforementioned issues. The SED produces light directly on its front surface. Scenes are lit only