What pattern for what display type - AVS Forum
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post #1 of 25 Old 07-13-2012, 06:08 AM - Thread Starter
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Hello,

I have for some time been wondering what pattern should be used for what display? I appreciate that this is likely to be a subject full of religion and prefences but here goes as far as I have been able to understand

Plasma: 10% windows 22%apl
LCD: Fields
LED: Fields
DLP fvp: large 22APL
LED fvp:???
SXRD fvp: large 22APL
RPTV: large 22APL

Others I'm missing?


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post #2 of 25 Old 07-13-2012, 07:18 AM
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With some LED sets (and LCD sets can follow the same guidelines) using window patterns gives dramatically lower Y readings than using fields, and the fields result is more consistent with the subjective brightness of the image. It's because of the dimming on some LED sets- when only a small area of the screen is lit, they dim the LEDs.
For that reason I would not recommend regular windows for them. I use full field on all LED/LCDs, though I imagine large APL windows might be OK also.
Also, some DLP and SXRDs have a dynamic iris. On the Mits DLP RPTVs sometimes it cannot be defeated. It is best to use large APL patterns on them.

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post #3 of 25 Old 07-13-2012, 07:58 AM - Thread Starter
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Thanks for the reply, I will update the first post as we go along.
Regarding projectors and large apl patterns, I assume that is to avoid contamination of the readings. Are we looking at 25% windows or even larger?


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post #4 of 25 Old 07-13-2012, 08:11 AM
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Sorry for the confusion... I meant large as opposed to the small APL patterns on the AVS 709 disc. The reason is the small ones can cause problems with meter aiming in some situations, and I'm not sure if there is enough picture area to avoid LED dimming and/or iris closing.

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post #5 of 25 Old 07-13-2012, 08:49 AM - Thread Starter
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im not sure we are misunderstanding each other at all, I think we are bot taking about window size, the reason I ask is because I want to create the patterns for the GCD disk, would 35% windows with a fixed 22%fixed APL be suitable?
and yes by contamination of the readings i was referring to fov.
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post #6 of 25 Old 07-13-2012, 10:14 AM
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For plasmas i stick to windows of approx 10-15% panel area size. Apl's just cause the ABL to kick in, checked this with the AVS disc. Ftl with windows approx 45, with APL's 42.

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post #7 of 25 Old 07-13-2012, 12:03 PM - Thread Starter
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But does using windows not causes problems at 10-40%


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post #8 of 25 Old 07-13-2012, 12:53 PM
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For plasmas you need to use windows. The question is what size (and type- APL or regular) windows is best. For regular windows, personally I like very small to small.

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post #9 of 25 Old 07-13-2012, 01:04 PM - Thread Starter
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Yes okay, what I meant was does regular windows not cause problem in the range 10-40%


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post #10 of 25 Old 07-13-2012, 01:09 PM
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Quote:
Originally Posted by Chad B View Post

For plasmas you need to use windows. The question is what size (and type- APL or regular) windows is best. For regular windows, personally I like very small to small.

What size (in % of total screen area) do you use?

I think the AVS disc uses 15% windows.
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post #11 of 25 Old 07-13-2012, 01:36 PM
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THX uses for plasmas 12%
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post #12 of 25 Old 07-13-2012, 01:53 PM
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Quote:
Originally Posted by anta1974 View Post

THX uses for plasmas 12%

do you mean the THX Calibrator's Disc?
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post #13 of 25 Old 07-13-2012, 02:14 PM
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No, organization
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post #14 of 25 Old 07-13-2012, 02:32 PM
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Tom Huffman and I are recommending ~10% area windows on a constant 20-25% average video level image for plasma calibration. These patterns are now available on the GCD disk.
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post #15 of 25 Old 07-13-2012, 04:04 PM
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Quote:
Originally Posted by PlasmaPZ80U View Post

do you mean the THX Calibrator's Disc?

THX Calibration Disk has 5% Square Window Patterns for Grayscale.

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post #16 of 25 Old 07-14-2012, 01:14 AM
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Power-limited displays; CRT, Plasma, OLED: Square 1% Area patterns. (alternatively, 22% constant APL patterns though this would not be my choice)
Non-limited display types; LCD, DLP, SXRD: Full field patterns.
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post #17 of 25 Old 07-14-2012, 03:28 AM
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1% windows APL or 1% windows ?

LED = OLED ?
or LED=LCD ?
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post #18 of 25 Old 07-14-2012, 08:33 AM
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Quote:
Originally Posted by anta1974 View Post

1% windows APL or 1% windows ?
LED = OLED ?
or LED=LCD ?

LED is a kind of LCD (aka LED-LCD) but OLED is not
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post #19 of 25 Old 07-15-2012, 01:34 AM
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New Spears&Munsil disk 8% patterns
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post #20 of 25 Old 07-15-2012, 09:09 AM
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Quote:
Originally Posted by anta1974 View Post

New Spears&Munsil disk 8% patterns

when is it coming out?
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post #21 of 25 Old 07-15-2012, 09:41 AM
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this summer
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post #22 of 25 Old 07-16-2012, 01:13 AM
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this summer
Thanks anta for the news (any link for this news ?) wink.gif
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post #23 of 25 Old 07-16-2012, 02:09 AM
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thanks for the link wink.gif
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post #25 of 25 Old 07-17-2012, 11:29 AM - Thread Starter
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So this turned out as expected some facts and some religion.

My interest right now is mainly front view projectors .
For this I have been recommended both fields, windows and a larger window with APL. I was wondering if anyone have a set of mesusrements using different patterns?


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