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Toshiba 34HF84 CRT HD Monitor HT Labs Measures

HT Labs Measures: Toshiba 34HF84 CRT HD Monitor

Full-On/Full-Off Contrast Ratio—15,320:1; ANSI Contrast Ratio—135:1

Measured Resolution with the Leader LT-446: 480: 470 (per picture height)720p: 530 (pph) 1080i: 550 (pph)

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

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

Measured Color Points: Red Color Point: x=0.638, y=0.333 Green Color Point: x=0.298, y=0.605 Blue Color Point: x=0.148, y=0.066

The left chart shows the 34HF84'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 somewhat cool across the gray-scale range. After making adjustments using the Photo Research PR-650, the gray scale measures within 78 kelvin of D6500, the accurate color temperature, across almost the entire range, although the darkest images start to drift warm.

The right chart shows the gray scale (or color temperature) relative to the color points of the display's red, green, and blue phosphors. These are almost exactly those specified by SMPTE. Blue is ever-so-slightly oversaturated.

A full-field 100-IRE white was 15.32 foot-lamberts, but a full-field 0-IRE black was too dark to measure. This means the contrast ratio was at least 15,320:1 (using 0.001, the lowest that our LS-100 can measure, as the base); in reality, though, the contrast ratio is much higher. Using a 16-box checkerboard pattern (ANSI contrast), the contrast ratio was 135:1.—GM

COMPANY INFO
Toshiba
(973) 628-8000
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