CS488 - Introduction to Computer Graphics - Lecture 2

Comments and Questions

  1. Combination to graphics lab.
  2. News group: uw.cs.cs488.
  3. Location of TAs: DC2303.
  4. Class cancelled: May 18, 2007.
  5. Existence of personal CS488 web pages.

Output Devices

Main device from the beginning was the colour cathode ray tube (CRT)

CRT

Main components

  1. Electron beam
  2. Focussing and acceleration electrodes
  3. Beam steering electrodes
  4. Phosphor

Operational principle -- Persistence of vision

Types of CRT

  1. Vector, aka calligraphic
  2. Raster -- operational principles
  3. Colour raster -- operational principles

Benefits of CRT

  1. Very inexpensive
  2. Good resolution
  3. Easy colour calibration
  4. High contrast
  5. Good field of view
  6. Comet-free motion
  7. Adjustable focus

Drawbacks of CRT

  1. Heavy and big
  2. Power hungry
  3. High voltage
  4. Dim

LCD

Key components

  1. Back light
  2. Programmable filters -- one per colour primary per pixel

Advantages

  1. small
  2. light
  3. not as power hungry as CRT

Disadvantages - most of these are back light problems

  1. directional view
  2. back light consumes power
  3. not very bright
  4. poor extinction
  5. hard to calibrate colour

Others of the past

Others of the future


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