The document provides an overview of common display technologies, including cathode ray tubes (CRTs), liquid crystal displays (LCDs), plasma displays, and surface conduction electron emitter displays (SEDs). It describes key features of each technology such as thickness, power consumption, viewing angle, and response time. SEDs are presented as a new technology that could combine advantages of CRTs and LCDs by using millions of miniature CRTs embedded in a thin surface with benefits like sharp resolution, excellent color and contrast, low cost, wide viewing angle, and low power consumption. Challenges for SEDs include unknown life expectancy and potential for screen burn-in, but expectations are that prototypes will soon be overcome through phosph

1. SEMINAR on SED A d a r s h .S

2. COMMON DISPLAY TECHNOLOGIES : AN OVERVIEW

3. Cathode Ray Tube Earliest displays A specialized vacuum tube in which images are produced when an electron beam strikes a phosphorescent surface Later RGB colour model for displays in colour monitors Affected by external fields Bulky , high power consumption and heat production

4. Liquid Crystal Display Displays thinner than ( CRT ) technology. LCD’s consume much less power Work on the principle of blocking light rather than emitting it. LCD has a grid of conductors with pixels located at each intersection in the grid. A current is sent across two conductors on the grid to control the light for any pixel . Slow response time Less viewable angle Difficulty in producing dark and grey colours

5. Plasma ” Technology Today” , also in development Electrical pulse excite a pixel Wider angle view than LCD Power consumption higher than LCD Complexity Cost greater than LCD Fragile technology : quite easy to damage PC connectivity less common since it is developing

6. Buzz into SED ?? Wider angle view !!!! Lower cost !!!! Superior picture quality !!!! Less complexity in overall terms !!!!

7. “ SURFACE CONDUCTION ELECTRON EMITTER DISPLAY ” Combine CRT into LCD technology. Millions of miniature CRTs, called surface-conduction electron emitters (SCEs) embedded in surface. “ High quality picture in low centimeter thickness” Only 3cm thickness

8. Inside SED @@ sv

9. how SED works ?? An SED-TV has millions of these SCE s arranged in a matrix , and each one controls the Red, Green or Blue aspect of one pixel of the picture. Rather than directing electrons to create the image one row at a time, the matrix activates all the SCE s needed to create the picture virtually simultaneously

10. SCE MATRIX One SCE pixel One SCE pixel

11. In short ……............ ……………… tied together When the SED-TV receives a signal,, a) Scans the signal b) Decides what to do with the red, green and blue aspect of each pixel c) Activates the necessary SCE s, which generate electrons that fly through the vacuum to the screen

12. Comparison between different technologies

13. Prototype models developed Developed by Canon

14. Beneficial Features Sharp resolution and fast response(1ms) and only 3cms in thickness Excellent colour and contrast potential Relatively inexpensive production cost 180º Viewing angle . Extremely low power consumption Lower cost than LCD or PLASMA It can be used in Mobile device display

15. Snaps from sed tv’s

16. Challenges Unknown (though optimistic) life expectancy Potential for screen burn-in : but expected to overcome due to phosphor development Currently prototype only expected soon

17. References: Document-United States Patent 7548017 engadgetHD Nanotechnology, Transactions on Volume 7, Issue 4, July 2008. Audioholics www.cnet.com www.newtechnologyworld.com

18. By A d a r s h

19. Questions