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MagyarThinkPad T490s and X390: Brighter, more accurate and better contrast
We showed you our two test configurations of the new ThinkPad models T490s ad X390 a couple of days ago. There have been many comments and questions about the displays, so we decided to publish our initial results. We also added the results of the respective predecessors for better comparison; in the case of the T480s both the WQHD as well as the 1080p SKUs.
| Lenovo ThinkPad T490s-20NYS02A00 B140HAN05.7, 1920x1080 | Lenovo ThinkPad T480s-20L8S02D00 LP140QH2-SPB1, 2560x1440 | Lenovo ThinkPad T480-20L6S01V00 Lenovo LP140WF6-SPB7, 1920x1080 | Lenovo ThinkPad X390-20Q1S02M00 LP133WF7-SPB1, 1920x1080 | Lenovo ThinkPad X280-20KES01S00 B125HAN02.2, 1920x1080 | Lenovo ThinkPad L390-20NR0013GE LP133WF2-SPL8, 1920x1080 | |
|---|---|---|---|---|---|---|
| Display | 5% | -41% | -3% | -34% | -39% | |
| Display P3 Coverage | 67.1 | 72.8 8% | 39.24 -42% | 65.3 -3% | 44 -34% | 40.42 -40% |
| sRGB Coverage | 97.6 | 97.9 0% | 58.8 -40% | 95.9 -2% | 64.5 -34% | 60.4 -38% |
| AdobeRGB 1998 Coverage | 68.5 | 74.1 8% | 40.56 -41% | 66.6 -3% | 45.45 -34% | 41.8 -39% |
| Response Times | 33% | 39% | 9% | 30% | 27% | |
| Response Time Grey 50% / Grey 80% * | 61.6 ? | 38.4 ? 38% | 35.6 ? 42% | 57.6 ? 6% | 40 ? 35% | 42.8 ? 31% |
| Response Time Black / White * | 38.8 ? | 28.4 ? 27% | 24.8 ? 36% | 34 ? 12% | 29.6 ? 24% | 30 ? 23% |
| PWM Frequency | 30490 ? | |||||
| Screen | -25% | -82% | -1% | -44% | -101% | |
| Brightness middle | 391 | 352 -10% | 307 -21% | 356 -9% | 344 -12% | 298 -24% |
| Brightness | 389 | 343 -12% | 295 -24% | 336 -14% | 313 -20% | 278 -29% |
| Brightness Distribution | 87 | 91 5% | 90 3% | 88 1% | 82 -6% | 81 -7% |
| Black Level * | 0.23 | 0.46 -100% | 0.25 -9% | 0.16 30% | 0.25 -9% | 0.33 -43% |
| Contrast | 1700 | 765 -55% | 1228 -28% | 2225 31% | 1376 -19% | 903 -47% |
| Colorchecker dE 2000 * | 3.4 | 3.3 3% | 5.7 -68% | 3.6 -6% | 4.7 -38% | 6.5 -91% |
| Colorchecker dE 2000 max. * | 4.7 | 7.3 -55% | 21.3 -353% | 5.5 -17% | 19.4 -313% | 23.9 -409% |
| Colorchecker dE 2000 calibrated * | 1.1 | 4.7 -327% | 1.1 -0% | 4.9 -345% | ||
| Greyscale dE 2000 * | 4 | 5.3 -33% | 3.7 7% | 4.7 -18% | 2.2 45% | 5.6 -40% |
| Gamma | 2.49 88% | 2.22 99% | 2.11 104% | 2.48 89% | 2.16 102% | 2.08 106% |
| CCT | 6809 95% | 6452 101% | 7353 88% | 6374 102% | 6252 104% | 6669 97% |
| Color Space (Percent of AdobeRGB 1998) | 62.4 | 68.4 10% | 37.4 -40% | 61.3 -2% | 41.2 -34% | 38.4 -38% |
| Color Space (Percent of sRGB) | 97.4 | 98 1% | 58.7 -40% | 95.7 -2% | 64.1 -34% | 60.1 -38% |
| Total Average (Program / Settings) | 4% /
-11% | -28% /
-59% | 2% /
0% | -16% /
-32% | -38% /
-73% |
* ... smaller is better
Let's start with the good things. The Full-HD panel of the T490s is much brighter and reaches the advertised 400 nits at some measurement points. This makes it much brighter than the previous 1080p SKU and even the WQHD screen is beaten. The black value does not suffer, which results in an excellent contrast ratio. The panel of the X390 is also brighter with an excellent contrast ratio.
The biggest (positive) is the improved color accuracy, which is not common among business devices. Both models cover almost the full sRGB gamut and the DeltaE-2000 deviations of all colors are below the important mark of 3 after our calibration.
We also encountered one drawback: long response times. They result in clearly visible ghosting (very noticeable when you move the cursor or windows).
Expect our full in-depth analysis of the screens in our upcoming reviews.
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