Black And White Uniformity, Viewing Angles
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 | ||
| 149.6964 | 170.7121 | 166.6663 |
| 149.5183 | 182.223 | 162.0439 |
| 166.221 | 172.1839 | 176.2046 |
| Black Luminance cd/m^2 | ||
| 0.5229 | 0.5711 | 0.6191 |
| 0.5653 | 0.6265 | 0.6656 |
| 0.7490 | 0.7862 | 0.7148 |
The SR2220L appears to have slightly poor white and black luminance on the left side. This is apparent if you view the monitor from the left side instead of the right.
| LG E2241V | ||
|---|---|---|
| White Luminance cd/m^2 | ||
| 177.9729 | 170.6266 | 184.4701 |
| 177.4437 | 204.3768 | 178.1245 |
| 176.9572 | 186.0513 | 177.3021 |
| Black Luminance cd/m^2 | ||
| 0.9577 | 0.7750 | 1.3384 |
| 1.0006 | 1.0147 | 1.3598 |
| 0.9021 | 0.8237 | 1.0901 |
The E2241V has poor white uniformity. We calibrate the center of the screen to 200 cd/m2, but every other region seems to fall behind. Black luminance is slightly more uniform, but the right side of the screen definitely has a problem yielding deep blacks. Remember that overall black luminance is poor on the E2241V. At 1 cd/m2, we can't seem to achieve deep blacks anywhere on the screen, even though we set the OSD's Black Level setting to low.
| Samsung S22A350H | ||
|---|---|---|
| White Luminance cd/m^2 | ||
| 176.8355 | 182.9128 | 173.9158 |
| 182.7114 | 194.9993 | 179.5684 |
| 177.4654 | 180.0863 | 170.4172 |
| Black Luminance cd/m^2 | ||
| 0.7991 | 0.3927 | 0.7043 |
| 0.9028 | 0.4444 | 0.8126 |
| 0.7324 | 0.3791 | 0.5409 |
Similar to the E2241V, Samsung's S22A250H has a problem with white luminance. We are able to calibrate the center of the screen to 200 cd/m2, but this offsets other regions. Black uniformity behaves completely different. The center of the screen produces the deepest blacks, while the left and right suffer. This reduces the perception of contrast ratios if you're viewing from the left or right side, because you get lower white luminance and high black luminance.