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Black And White Uniformity, Viewing Angles

Three-Way 23" LED LCD Roundup: Dell, HP, And Samsung
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Another measurable aspect of panel performance is brightness uniformity. Most manufacturers calibrate displays based on the center point of the screen. However, every area of the screen behaves differently. Sometimes you can get better performance in one specific region. As a result, we have added a nine-point black and white luminance test to measure the performance of each monitor's panel.

Dell SR2320L
White Luminance cd/m^2
170.3404192.1471197.5039
176.0936200.9093211.4455
175.5504200.463209.2209
Black Luminance cd/m^2
0.11680.15100.1199
0.11070.13180.1748
0.09560.11690.1520


The SR2320L appears to have slightly lower luminance near the left edge of the screen. That's why the viewing angle on the left appears worse than the right. 

HP 2311x
White Luminance cd/m^2
176.2259198.3685179.2023
194.1763197.1751192.6677
188.7952186.0513186.7866
Black Luminance cd/m^2
0.20550.23810.2326
0.20880.26040.2121
0.25880.20760.2055


HP's 23" LCD produces good uniformity of black tones. However, white luminance performance is noticeably poor near the edges.

Samsung PX2370
White Luminance
181.093180.5944176.8229
188.3543202.569180.8776
209.8375214.0824209.074
Black Luminance
0.11710.21360.1586
0.13270.14600.1348
0.21460.16020.1349


White luminance is fairly even on the PX2370, though the bottom portions of the screen appear slightly brighter. Black luminosity appears more spotty, as you can see from the contour plot. This also turns up in viewing angle performance. But unless you plan to game on multiple screens, this shouldn't be a big concern.

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