View Single Post
  #28  
Old April 27th 09, 04:01 PM posted to alt.comp.hardware,alt.sys.pc-clone.acer,comp.sys.laptops,uk.comp.sys.laptops
BillW50
external usenet poster
 
Posts: 1,710
Default Acer Aspire 5630 Laptop screen/display problem

In ,
kony typed on Sun, 26 Apr 2009 23:21:01 -0400:
On Sun, 26 Apr 2009 09:44:06 -0500, "BillW50"
wrote:

In ,
Barry Watzman typed on Sat, 25 Apr 2009 21:55:00 -0400:
"Well after the external video jack (which is analog video), it
gets converted to digital and fed to the LCD display."

This is a driver issue, but that explanation of how things work is
wrong (although irrelevant to the issue). The digital video is
produced natively. The analog video is then produced from that.
Not the other way around.


But Pete (the OP), also stated on the 23rd that he booted up with :
"TuffTest Pro (http://www.tufftest.com/ttp01.htm) that is
self-booting, operating system independent and never goes anywhere
near Windows". So how can it be a Windows driver issue if the
problem still exists without Windows?


Becaues the display adapter isn't stretching non-native
resolutions to fill the entirety of the screen, instead it
is keeping the correct aspect ratio and upsampling.

And it is converted to digital, to analog, and back partially into
digital (a mix of the two). Same thing happens when you plug into an
external LCD monitor as well. As the pixels live in a digital matrix,
while the contrast is controlled by analog means.


It is not converted to analog and then back to digital. It
starts digital and stays digital to output to the LCD panel
built in, or is converted to analog for the output to an
external monitor.


Are you saying the brightness and contrast (also gray scales) are
adjusted digitally? How can that be? As it is an analog voltage that
controls this on every pixel on a LCD screen.

--
Bill
Asus EEE PC 701G4 ~ 2GB RAM ~ 16GB-SDHC
Windows XP SP2