In general, I have a great deal of respect for HDTVTEST, but that measurement cannot have been done correctly - that native contrast ratio would be barely above IPS-level and would be disasterous for a VA LCD.
Chad's measurement is probably more reflective of the true native contrast of the panel: https://clevelandplasma.com/store/20...ny_xbr_75x940c
"Contrast ratio was measured with 10% size, 22% APL windows. The native panel contrast ratio measured 4232:1
(57.9 fL white, .0137 fL black) without the aid of the local dimming. With local dimming on high or medium, the contrast ratio was so good it was unmeasurable. With the local dimming on low, it was 86363:1 (57.69 fL, .00067fL). This is extremely impressive performance. Setting the local dimming to high compressed highlights in some test patterns, but everything looked great with it set to medium, with even dark images showing outstanding contrast."
In comparison, Chad's measurements of the Samsing JS9500 indicate that it does have a very dissapointing native contrast ratio: https://clevelandplasma.com/store/20...ung_un65js9500
Using custom APL “torture test” windows (50% size, 99% APL), I measured the following worst case scenario contrast ratios:
Smart LED off: 1843:1
(45/.024 fL); Smart LED low and standard: 3935:1 (45.2/.011 fL) Smart LED high: 3940:1 (77/.0195 fL). Turning Smart LED to high was like turning on a brightness turbocharger, though it did not increase the contrast ratio.
Using 10% size 25% APL windows, which will approximate real content, gave the following results:
Smart LED low and standard: 15456:1 (43.1/.0028fL); Smart LED high: 16058:1 (73.6/.0046 fL).
Using full fields or conventional windows, the contrast ratio was immeasurable since the dimming made the blacks perfectly black."
This link will show you Buzz767's characterization of the native contrast ratio of the 2014 Vizio P60: https://www.avsforum.com/forum/166-lc...l#post28223362
He measured a native contrast ratio of 7280:1 (slightly high than my measurements of the P70).
And finally, here is a press release from 2007 where AUO announced their new AMVA panel technology with a native contrast ratio of 5000:1: http://www.auo.com/?sn=107&lang=en-US&c=10&n=589
The native contrast ratio of the Sony 75X940C is far, far higher than 1538:1 (unless, perhaps, the British version is based on an IPS panel