Update: I took a photo of the middle of the desktop with background color set to black and one with background color set to white (there were some icons on the desktop, so I don't think dynamic contrast would have been invoked even if this screen has it) with this TV to get an idea of the contrast ratio using the calculator at lagom.nl:
http://www.lagom.nl/lcd-test/contrast_ratio.php
Unfortunately, I am limited because my camera doesn't let me manually choose the F-number or shutter time. Here are the results I got using the RGB value averaged from the center 320x240 of each image (by cropping that part, then rescaling to 1 pixel by 1 pixel in Paint.NET and using the dropper to get the color value):
Black Image: 1/4 sec exposure time, F 3.5, ISO 400, RGB value = 8,12,21; Luminance calculated as 0.04 cd/m² (but gives warning "low RGB values (below 50) are unreliable.")
White Image: 1/125 sec exposure time, F 5.6, ISO 400, RGB value = 130,146,168; Luminance calculated as 232 cd/m²
The contrast ratio it calculates for this is 6183 : 1, but it gives an additional warning: "Warning: different F numbers may cause up to 15% error in the calculated contrast ratio."
Uploading the images (which apparently have the camera model, exposure time, F-number, ISO value, etc. in the metadata already; I hadn't realized they would) to lagom got me an even less believable number: 12191:1, but with the following processing remarks:
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 23.8 s (Set EV to +6.6)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: Image F-number settings are not the same.
requisite0, do you have a better camera (that allows setting the shutter time and F-number), and if so, could you please use it to get a better measurement of the contrast ratio of this TV?