l17 - 6.111 Lecture # 17 Video Diaplays Vido Displays are...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
6.111 Lecture # 17 Vido Displays are usuall implemented by Cathode Ray Tubes Electron Beam os focused into a small spot on the screen Energy delivered to a phosphor creates a glowing dot (pixel) Beam can be moved rapidly in 2 dimensions Beam current determines brightness of the spot 1 Composite Frames The 'frame' is a single picture (snapshot) It is made up of many lines Each frame has a synchronizing pulse (Vertical Sync) Each line has a synchronizing pulse (Horizonatl Sync) Brightness is represented by positive voltage Horizontal and Vertical intervals both have blanking 3 Video Diaplays Television and most computer displays use raster-scan: 2 Digital Displays White Dots on a Black Screen White is positive Black is a low voltage Sync is below black Sync pulse is in the middle of the blanking interval 4
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Composite Synchronization Horizontal Sync coordinates lines Vertical Sync coordinates frames Similar but for time scales And they are superimposed on one another These numbers are for television like displays
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/20/2009 for the course ELECTRICAL 6.111 taught by Professor Prof.dontroxel during the Fall '02 term at MIT.

Page1 / 4

l17 - 6.111 Lecture # 17 Video Diaplays Vido Displays are...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online