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How a Micro-Computer was Borne in 1971?
Color-Circuit Board in PC
Engineering Info for Computer VF Engineers
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R-Y &
B-Y color signals |
I & Q color signals |
NTSC & PAL Systems |
250 Colors
640x400 Pixels
VGA - Video Graphic Array (Analog Signal)
CGA - Color Graphic Adapter
Pixel x Line Resolution = 640 x 200 Pixels
EGA - Enhanced Graphic Adapter
640 x 350 Pixels
XGA - Extend Graphic Array
1028 x 768 Pixels, 65k Colors
XGA-2 - 1600 X 1200 Pixels
PC Display:
CRT - Cathode-Ray Tube
Raster for the CRT device
LCD - Liquid Crystal Display
DLP - Digital Light Processing - DMD (Digital Micromirror Device)
DPF - Digital Flat Panel
PAL System - Phase Alternat Line
The phase of color carrier is alternate from line to line.It takes 4 full frams(pictures) for the color carrier to
horizontal phase relationship to return to the reference point.
This alternation helps cancel out phase errors. HUE CONTROL is not needed on a PAL TV set.
625-line / 50-field An European/Austrilian TV System
Color Concept & Signal
R: red signal wave length =
700.0mu
G: green signal wave length = 546.1mu
B: blue signal wave length = 435.8mu
R-Y,
B-Y, Y
What are Color I & Q Signals? and
their relations between R-Y & B-Y.
HOW SYNC &
COLOR
SIGNALS ARE FORMED
Screen Colors
vs. Signal Waveforms
VIDEO Carrier & VF Signal
VIDEO (VF) SIGNAL & ITS PICTURE ON SCREEN
Composite VF - consisting of a
VF (picture) signal, a Blanking pulse & a Sync pulse
The Formation of Color VF Signal
Reference Material for Computer VF
Engineers
Tr - rise time
Tf - fall time
TTL
means Transistor-Transistor Logic
db (Decibel)
a "unit" to express GAIN value instead of "ratio"