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Do DLP, LCOS LCD, or any other fixed pixel display need ISF calibration?

Discussion in 'Displays' started by Jeff Adams, Nov 24, 2003.

  1. Jeff Adams

    Jeff Adams Well-Known Member

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    I am in the market for a new hdtv and am leaning towards DLP or LCD and am wondering how easy set up is on these units. Do they need to be calibrated like CRT displays?
     
  2. JohnnyG

    JohnnyG Well-Known Member

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    Perhaps there aren't as many things to 'fiddle' with, but these types of displays will benefit from accurate grey scale and a bit of tender loving care just as much as CRT based sets do.
     
  3. Neil Joseph

    Neil Joseph Well-Known Member

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    I had my LCD projector calibrated and the amount of time spent was a lot less than would be necessary for a crt, yes. The grayscale was adjusted as JohnnyG suggests.
     
  4. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    Greetings

    Depending on the tech be it FPTV or RPTV tech ... you look to grayscale and colour decoder and some geometry items like overscan and centering.

    sometimes there are other things like edge enhancement circuits that need to be killed ...

    Faster ... but of course the pricing for such a service reflects the fact that less work is needed.

    Regards
     
  5. ChrisWiggles

    ChrisWiggles Well-Known Member

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    Of course, every display will benefit with at least basic calibration. The extra setup that is involved with CRT is just that: setup. I wouldn't really consider it calibration. While it is paramount to have a good setup to get the most out of the display, it isn't directly a part of the more classical calibration items, like color temparature, greyscale tracking, etc etc.
     
  6. Ryan_McCormick

    Ryan_McCormick Active Member

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    So it would be possible to have the overscan corrected on a Toshiba 62HM84 DLP via ISF calibration?
     
  7. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    Greetings

    Not really. Toshiba has taken a big step backward when it comes to calibration this year. You can only do grayscale and that is about it.

    Regards
     
  8. Mike Boniferro

    Mike Boniferro Well-Known Member

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    Michael, have you had a chance to play with the HM85 sets yet? I know the 52" is available... I wonder if they 'corrected' this step back from last year?
     
  9. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    Greetings

    I haven't had a chance to play with one yet ... likely tomorrow night when I visit the store to play ...

    regards
     
  10. Ryan_McCormick

    Ryan_McCormick Active Member

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    Well that is definately not good news. Using the overscan screens on Avia and DVE it shows exactly 5% on all sides. Is that average? Should I be happy with that on a $3.5k set?

    I wouldnt really have put much thought into if DVE hadnt mentioned that DVD producers no longer compensate for the overscan and take important info and shots right out to the edges of the picture.

    Thanks for all your input on this guys.
     
  11. PerryD

    PerryD Well-Known Member

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    I understand overscan on a analog setup, but why would there be overscan on a digital set? If the transmission is 1280x720 and the set is the same, the set should translate the image pixel for pixel, especially if the connection is DVI, correct? Otherwise, wouldn't there be scaling artifacts, scaling the 5% overscanned image up to the native resolution of the display?
     
  12. Ryan_McCormick

    Ryan_McCormick Active Member

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    I personally think that a 5% overscan on a higher end TV is a little much. Combine that with the fact that you cant correct it and it is unacceptable. Am I the only one who feels that way?
     
  13. PerryD

    PerryD Well-Known Member

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    On an analog set, 5% overscan was always the value to calibrate to, anything less and you may pick up flickering scan lines on the bottom of the screen from a few cable channels or from a VCR.
     
  14. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    Greetings

    5% is safe ... and when you are on an assembly line ... you use 5% ... because you don't have the time to dicker with units down to 2% say if some of the units can't do that ... for what ever reason.

    More time on the line means more money out of pocket.

    Regards
     
  15. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    "Michael, have you had a chance to play with the HM85 sets yet? I know the 52" is available... I wonder if they 'corrected' this step back from last year?"

    Greetings

    I was at A&B Sound last night and I finally got a chance to play with the new units. I calibrated the new 46" HM85 unit and before I started, I specifically looked for some of the more glaring problems that the 84 series had.

    Here are the highlights from the calibration.

    The Service menu is just as limited as before.

    Grayscale in Movie mode was 9500K ...

    The discoloration in the grayscale appeared to be pretty much gone. YES!!! They listened!!

    Grayscale tracking to D6500 was amazingly good ... almost ruler flat from 30% to 100% white with a slight dip to 7100 at 20%. This was very nice. Achieved in 5 minutes no less.

    From a pure image perspective, the new 85 series ... at least this one, was a very pleasant surprise and gets my tentative "thumbs up." It is better than the 44" Toshiba unit from the 84 line which was the best looking of that line.

    I won't be calling the new units my 75% sets ... they are my 85% sets.

    Regards
     
  16. Ryan_McCormick

    Ryan_McCormick Active Member

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    So if it is not correctable via ISF could a HTPC correct it for me? I have read that you can download programs to reduce overscan on HTPC's.
     

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