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Discussion Starter · #1 ·
Hi all,


On my XG135, I can't figure out how to get the horizontal linearity right for 1080i or 1152i, as output by my HTDV receiver. I can get the linearity perfect vertically. I can also get it perfect both horizontally and vertically for all other resolutions I have tried, which have all been progressive resolutions output by my Quadscan Pro.


The horizontal linearity on 1080i or 1152i is a problem though. When I bring a fine grid test pattern up (internal), I can get the left and right to mirror grid to be a mirror image, but I can't get the width of the boxes to be linear across the screen.


When I measure the width of each box in the grid, I measure at the left edge, at 1/8, at 1/4, and at the centre, and here is what I get. (ignore the dots, I couldn't figure out how to tabulate the data)

Left....1/8.....1/4....Centre

--------------------------------

105mm...100mm...96mm...100mm


No matter how I adjust the linearity or the linearity balance, I can't seem to get it linear, and it's driving me nuts!


So, I figure it could be one of the following
  • The projector is broken
  • The projector doesn't like interlaced images
  • The projector specifically doesn;t like the output of the HSTV receiver
  • The HDTV receiver is putting out a dodgy signal


Anyone got any ideas of what to look at?


Many thanks in advance


Regards


John
 

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Try the sublinearity control which is accessed by control+linearity.
 

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Conceptualizing it as moving the 1/4 and 3/4 points across the screen in and out without moving the leftmost and rightmost ends.
 

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After firing up the pj for a movie tonight I used the Cntrl-Linearity button combo and found it was just a different way to get to the Linear Balance adjustment...I've always gotten to it through the convergence menu.
 

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Discussion Starter · #7 ·
Fellas,


Thanks to all that have replied, I appeaciate the help.


Guy, Thanks for the tip. CTL+Linearity takes you to the Linearity Balance menu, as KennyG found out. I've tried playing with this control at length, and found that it while it does adjust the 1/4 and 3/4 points across the screen, it also affects the outer edges proportionally. So, if I adjust the linearity balance so that the 1/4 and 3/4 are correct, then the outer edges are much much wider than the centre.


Vern, I've never seen that adjustment, I'll take a look tonight, thanks!


Anyone got any other suggestions?


Regards


John
 
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