1. Overview of Graphics Systems
Part I

2. Type of Video Display Cathode-Ray Tubes (CRTs) Flat-Panel Displays TV
RGB Monitor
Oscilloscope
Flat-Panel Displays
PDA
Handphone
Laptop
Calculator
Digital Watch

3. CRT
Electrons are fired from a filament, focused, accelerated, then deflected to a point on the phosphor coating on the inside of the display screen.

4. Random-Scan CRT Electron beam is scanned along each line segment.
Capable of displaying continuous lines and very high resolution curves.
High-end displays capable of 100k lines per refresh.

5. Random-Scan CRT (cont.)
Advantages:
Excellent for line drawings
Generally high resolution
Disadvantages:
Cannot display realistic shaded images
Not capable of color
Example:
Oscilloscopes

6. Raster-Scan CRT
Electron beam is scanned from left-to-right, top-to-bottom.
Beam retraces to top-left after reaching bottom-right (vertical retrace).
Capable of displaying continuous range of intensities at discrete positions.
High-end displays capable of 4k x 120 Hz

7. Raster-Scan CRT (cont.)
3 electron guns are used, one for each color.
The gun are aimed through a mask and onto colored phosphors.
Colored phosphors are arranged in RGB triples.
Dot (delta) – RGB monitors
Stripes (inline) – TVs, Sony Trinitron

8. Raster-Scan CRT (cont.)
Advantages:
Excellent for varying intensity
Can display shaded images
Color
Disadvantages:
“Jaggies”
Example:
TVs

9. Liquid-Crystal Display (LCD)

10. Plasma-Panel Display

11. LCD vs. Plasma Price? Size? Viewing angle? Burn-In Effect?
Watching Motion?
Pixel?
Life Span?
Color?
Brightness?

12. Virtual Reality Devices
Head-Mounted Display (HMD)
Stereoscopic Glass