CET ,DIGITAL SIGNAL PROCESSING SURFACE CONDUCTION ELECTRON EMITTER DISPLAY (SED) MAHANTESH R.CHOUDHARI DIGITAL SIGNAL PROCESING
CET ,DIGITAL SIGNAL PROCESSING A Surface-conduction Electron-emitter Display (SED) is a flat panel display technology currently being developed by a number of companies. Canon began SED research in 1986 and, in 2004, Toshiba and Canon announced a joint development agreement originally targeting commercial production of SED’s by the end of 2010. SED will be the next generation display technology in the near by future. Hopefully we will see a Canon SED display since CEATEC (Combined Exhibition of Advanced Technologies)LAB in Japan started developing on SED Display Panels TECHNOLOGY DEVELOPMENT:
CET ,DIGITAL SIGNAL PROCESSING SED’s use nanoscopic scale electron emitters to energize colored phosphors and produce an image. In a general sense, a SED consists of a matrix of tiny cathode ray tubes, each "tube" forming a single sub-pixel on the screen grouped in threes to form red-green-blue (RGB) pixels. A Surface-conduction Electron-emitter Display (SED) is a flat panel display technology that uses Surface Conduction Electron emitters (SCE’s) for every individual display pixel. The surface conduction electron emitter emits electrons that excite a phosphor coating on the display panel. WHAT IS SED??????????
CET ,DIGITAL SIGNAL PROCESSING Working of SED Creating the picture o The electron emitting device o Electrons emitted from emission region by applying a voltage o SED Display consists of SCE units o Millions of these SCE units are used o A set has three SCE’s for every pixel o Millions of these SCE’s are arranged in a matrix o The matrix activates all the SCE’s needed to create the picture virtually simultaneously
CET ,DIGITAL SIGNAL PROCESSING HOW SED Technology Works ???
CET ,DIGITAL SIGNAL PROCESSING Internal Structure of SED Internal connections:
CET ,DIGITAL SIGNAL PROCESSING CRT: 1. Three Electron guns (for red, green and blue phosphor dots) 2. Electron beams 3. Focusing coils 4. Deflection coils 5. Anode connection 6. Mask for separating beams for red, green and blue part of displayed image 7. Phosphor layer with red, green and blue zones 8. Close-up of the phosphor-coated inner side of the screen