LG RU-42PX11 Plasma EDTV HT Labs Measures

HT Labs Measures: LG RU-42PX11

Full-On/Full-Off Contrast Ratio—403:1; ANSI Contrast Ratio—385:1

Measured Resolution with the Leader LT-446: 480: 410 (per picture height)20p: 430 (pph) 1080i: limits of panel (pph)

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

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

Measured Color Points: Red Color Point: x=0.651, y=0.338 Green Color Point: x=0.268, y=0.6 Blue Color Point: x=0.149, y=0.058

The left chart shows the RU-42PX11'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 warm color-temperature mode, measures slightly cool with dark images and very cool with brighter images. After making adjustments using the Photo Research PR-650, the gray scale measures better, within 1,025 kelvin of D6500, the accurate color temperature, across the entire range.

The right chart shows the gray scale (or color temperature) relative to the color points of the display's red, green, and blue phosphors. Blue is slightly purple, red is slightly oversaturated, and green is oversaturated and slightly bluish-green.

Using a full-field 100-IRE white (27.8 foot-lamberts) and a full-field 0-IRE black (0.069 ft-L), the contrast ratio was 403:1. Using a 16-box checkerboard pattern (ANSI contrast), the contrast ratio was 385:1. A 100-IRE window produced 69.3 ft-L. It is normal for a plasma to have lower light output on a full-field white versus a white window.—GM

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