Westinghouse Digital LVM-47w1 High Definition Monitor Measurements
For my tests, I calibrated the LVM-47w1 with test patterns from my tried-and-true AccuPel HDG2000 test pattern generator, setting all parameters for best grayscale image quality. Using the service codes from Westinghouse Digital, I tweaked the red, green, and blue controls to get as close as possible to D6500.
After all adjustments, I measured brightness at 69 foot-Lamberts, which is way more than needed for viewing at home. Lowering the backlight setting drops that more effectively into the 22-30fL range I prefer to work with. Even so, the LVM-47w1 can track an uncompressed grayscale at this higher brightness level.
Contrast measured using the ANSI checkerboard yielded 255:1 and peak contrast (ratio of highest to lowest readings from the checkerboard, not peak full screen white/full screen video black) was 310:1. After calibration, I was also able to achieve a nice 2.2 – 2.4 gamma with no crushing at the high or low end of the grayscale.
The LVM-47w1 wanders quite a bit when it comes to color temperature, and no amount of the single set of RGB calibration adjustments would fix the problem. After calibration, I measured a total shift of 1640 degrees from 20 to 100 IRE. There was a consistent drop in color temperature as luminance values increased. It would require separate high and low red, green, and blue calibration controls to fix this, and the LVM-47w1 only provides a single set of overall R, G, and B adjustments.
I also measured the available color gamut with ColorFacts 6.0, comparing it to the standard REC.709 HDTV color space. The LVM-47w1 comes very close to the ideal red, blue, and magenta coordinates, coming up short in green, yellow, and cyan. That's very respectable performance for LCD display technology.