VP2770-LED Vs. S27B970D: 27" Monitors At 2560x1440

Results: Viewing Angle And Uniformity

Since both panels are IPS-based, we expected to see superb off-axis viewing performance, and we did. While Samsung calls its technology PLS, it works on the same principle.

ViewSonic's VP2770-LED looks every bit as good as the other IPS-based panels we’ve tested recently. There is very little light falloff at the 45-degree mark and there is no perceptible color shift. This is one of the best reasons to put an IPS monitor on your desktop.

Samsung’s off-axis test looks almost exactly like ViewSonic’s. There is little difference between the two monitors. Neither exhibits any color shift as you move off-axis, and the light falloff is relatively linear.

While some monitors are better than others, no LCD panel has perfect screen uniformity, and even samples of the same model can have quite a bit of variation. So, since there’s no solid standard for applying a rating to different monitors, we’ll simply present the results of our measurements.

To measure screen uniformity, zero percent and 100 percent full-field patterns are used, and nine points are sampled. We’re now expressing the values as percentages relative to the center of the screen.

ViewSonic VP2770-LED
Black Field Uniformity (percentage of center)
80.51%
85.61%
98.35%
75.18%
100%
75.18%
73.20%
100.51%
72.72%
White Field Uniformity (percentage of center)
89.34%
95.01%
89.31%
87.84%
100%
88.72%
88.00%
88.87%
89.00%
Samsung S27970D
Black Field Uniformity (percentage of center)
87.62%
97.21%
89.38%
98.39%
100%
93.49%
96.00%
91.25%
92.60%
White Field Uniformity (percentage of center)
97.30%
98.49%
95.85%
95.77%
100%
94.26%
90.06%
91.29%
95.33%


While both panels display excellent uniformity at their brightness extremes, the Samsung is exceptional. This is likely due to the factory calibration, which includes uniformity in its round of tests. Even though we measure in the Standard mode, the uniformity lookup table in the monitor’s firmware is obviously utilized. It would be quite difficult to improve on this performance.

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  • Stoppemfloppen
    Whilst the comprehensive measuring data is very nice some "real world" work such as gaming, playing movies and photo editing would have been nice.

    Input lag is vital for games and panel response is very important for both games and movies. Then of course there's the accuracy for the photo buffs. 57/58ms input lag seems OK, both are pretty much the same. But 27ms response (effectively 37fps) is too high for gaming so to me that counts the Samsung out as any sort of high end multimedia monitor, you will see motion trails of one or more colours in a darkened room. Which leaves the viewsonic, which is cheaper by quite a margin and is tantalisingly close to the magic 16ms figure, which gives you genuine 60fps refresh.

    But how did it look in the real world and how did the Samsung compare?!?! Oh the frustration!