Sharp AQUOS LC-45GX6U 45-Inch LCD HDTV HT Labs Measures

HT Labs Measures: Sharp AQUOS LC-45GX6U 45-Inch LCD HDTV

Full-On/Full-Off Contrast Ratio—505:1; ANSI Contrast Ratio—442:1

Measured Resolution with the Leader LT-446: 480:470 (per picture height)720p:720 (pph) 1080i:1080 (pph)

DC Restoration (poor, average, good, excellent): Excellent

Color Decoder (poor, average, good, excellent): Good

Measured Color Points: Red Color Point: x=0.641, y=0.338 Green Color Point: x=0.271, y=0.606 Blue Color Point: x=0.145, y=0.067

The left chart shows the LC-45GX6U'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 mid-low color-temperature mode measures slightly cool with dark and bright images and close to D6500, the accurate color temperature, in the midtones. After making adjustments using the Photo Research PR-650, the gray scale measures, well, differently, than before. It's within 897 Kelvin of D6500 across the entire range.

The chart on the right shows the gray scale (or color temperature) relative to the color points of the display's red, green, and blue color filters. Blue is very slightly oversaturated. Red is very slightly reddish orange. Green is bluish-green.

Using a full-field 100-IRE white (24.75 foot-lamberts) and a full-field 0-IRE black (0.049 ft-L), the contrast ratio was 505:1. Using a 16-box checkerboard pattern (ANSI contrast), the contrast ratio was 442:1. I got the best contrast ratio in the –16 back-light setting. I got the brightest image in the +16 back-light setting, and it produced 123.6 ft-L with a 100-IRE window. The contrast ratio in this setting was 480:1. It is worth noting that this is the highest recorded resolution of any display we've reviewed.—GM

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