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'[TLUG]: XF86 config needed'
Peter L. Peres
|>Also could someone explain how LCD screens deal with vertical and
Electrically speaking, the LCD is a very large shift register. Data is
clocked in by something called pixel clock. This is known as the dot clock
in X11 config files. The data clocked in is analog RGB information on
three distinct channels, called R, G, B usually. The shift registers in
the LCD have a certain length and when a line is full, then the register
needs to be transferred to other (vertical) shift registers.There are as
many vertical shift registers as there are horizontal pixels in the LCD.
The time to do this is when the horizontal sync pulse is coming from the
video display hardware. Similarily, the vertical shift registers in the
LCD eventually fill up, and then a the vertical sync pulse is used to
actually move the contents of all of the vertical shift registers into the
byte cells, where they eventually affect the display (it is not affected
while all the shifting and clocking happens). The blanking period is
important because the moving of the contents of the shift registers
requires a certain amount of time and special timing (achieved by a
controller chip or firmware). Too short = artifacts, too long = flicker in
the display. However, there is no rule, anything could happen.
hope this helps,
PS: The explanation above is valid for large (>512x256) displays with
serial addressing. Smaller displays may use direct XY matrix (not serial)
pixel addressing (examples: cellular phone, PDA).
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