In Products > Displays > SED Next-Generation Flat-Screen Display
Large Screen, High Image Quality, and High-Speed Video Response
SED Next-Generation Flat-Screen Display
SED Prototype
Digital HD broadcasting marks the advent of an era of high-definition and high image quality content, including the introduction of nextgeneration DVDs, home-use HD video camcorders, and other products in the years to come. To do justice to this content, displays must achieve even higher levels of image quality and offer larger viewing screens.
Due to the nature of CRT (cathode ray tube) displays, larger screens mean significant increases in weight and depth. SEDs (Surfaceconduction Electron-emitter Displays) represent the solution to this challenge.
High-definition through self-emission
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Comparison of CRT and SED
Like CRT systems, SEDs are self-emitting displays, based on a principle that utilizes the collision of electrons with a phosphor-coated screen. While offering the same fast video response and high contrast as CRTs, because they do not require electron beam deflection, SEDs combine a slim body design with high-definition, low-distortion imaging performance.
Electron emitters, which fulfill the role that the electron gun serves in CRT systems, are distributed in a number equal to the number of pixels on the display. The electron emitters, at the heart of the SED, are characterized by a "nanogap," an extremely narrow gap measuring only a few nanometers in width, formed between two electrodes on the electron-emitting layer. When voltage of approximately 10 volts is applied, electrons are emitted from one side of the nanogap. Some of the electrons are accelerated by voltage of roughly 10 kV applied between the glass substrates, striking the phosphor coating and emitting light.
SED Structure
High efficiency for low power consumption
Compared with other types of displays, SEDs convert electric energy into light with greater efficiency, achieving higher luminous efficiency and low power consumption. The SED is an environmentally sound display technology to meet today's energy-conservation needs.
Targeting low-cost production through semiconductorproduction technologies
Applying inkjet printing technology, Canon's forte, to form the vast number of high-precision electron emitters in the SED, and printing technology to produce the matrix wiring, Canon is actively working to create the production technologies needed to manufacture these largescreen displays at low costs.
Canon began SED research in 1986 and, in 2005, Canon ANELVA Corporation, boasting expertise in vacuum technology, was welcomed into the Canon Group. With these efforts, the groundwork is being laid toward the commercialization high-image-quality, low-cost SED products.
