Vizio GV42L LCD HDTV HT Labs Measures
Full-On/Full-Off Contrast Ratio—774:1;
ANSI Contrast Ratio—797:1
Measured Resolution with the Leader LT-446:
480: 480 (per picture height)
720p: 720 (pph)
1080i: Out to the limits of the 1,366-by-768 panel
DC Restoration (poor, average, good, excellent): Excellent
Color Decoder (poor, average, good, excellent): Excellent
Measured Color Points:
Red Color Point: x=0.633, y=0.339
Green Color Point: x=0.288, y=0.612
Blue Color Point: x=0.146, y=0.071
The top chart shows the GV42L's gray scale relative to its color temperature at various levels of intensity, or brightness (20 IRE is dark gray; 100 IRE is bright white). The gray scale as set by the factory, in the Normal color-temperature mode, measures warm across most of the gray scale. After making adjustments using the Photo Research PR-650, the gray scale measures closer to D6500, the accurate color temperature, across most of the range, although the darkest and brightest images are still rather cool.
The bottom chart shows the gray scale (or color temperature) relative to the color points of the display's red, green, and blue color filters. These are somewhat off those specified by SMPTE. Red is somewhat undersaturated and slightly reddish-orange. Blue is slightly greenish-blue. Green is somewhat oversaturated and slightly bluish-green.
After calibration, and using a full-field 100-IRE white (160.9 foot-lamberts) and a full-field 0-IRE black (0.208 ft-L), the contrast ratio was 774:1. Using a 16-box checkerboard pattern (ANSI contrast), the contrast ratio was 797:1. The best contrast ratio was achieved with the backlight set at 100. The best black level was achieved with the backlight set at 0. In this mode, the TV produced 37.94 ft-L with a 100-IRE field and 0.052 ft-L with a 0-IRE field.—GM