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Black And White Uniformity, Viewing Angles

Touchscreen Computing: Gateway ZX4931 And HP TouchSmart 310
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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.

Gateway One ZX4931
White Luminance cd/m^2
137.7135155.0922141.8398
140.4738163.2266144.9958
139.0497151.8800141.6339
Black Luminance cd/m^2
0.19700.21070.1861
0.14990.19980.1730
0.16180.22060.1403


The ZX4931 produces a high white luminance towards the center, and the values fall off as you move toward the corners. Black production is a little better, but the center-top and center-bottom areas of the screen appear brighter. The overall uniformity is poor, and viewing angles tend to enhance the visual differences between regions.

HP TouchSmart 310
White Luminance cd/m^2
145.8242168.2889170.8824
147.8051180.3175167.0457
162.6824175.5959174.7452
Black Luminance cd/m^2
0.14780.16670.1835
0.15830.16150.1702
0.18490.21370.1832


HP's TouchSmart 23" produces decent overall uniformity, but it has weak white luminance near the left side. In actual use, we only see a problem if you are viewing the display from the left. Black luminance is mostly even, though the center-bottom edge tends to appear slightly brighter.

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