联想ThinkPad T490笔记本电脑评测：WQHD HDR面板在测试中表现出色，但在办公笔记本中意义有限
Lenovo ThinkPad T490-20N30000GE (ThinkPad T490 Series)
Processor
Intel Core i7-8565U 4 x 1.8 - 4.6 GHz, Whiskey Lake-U
Graphics adapter
NVIDIA GeForce MX250 - 2048 MB VRAM, Core: 1582 MHz, RAM: 1752 MHz, Optimus
Memory
16 GB
, DDR4-2400
Display
14.00 inch 16:9, 2560 x 1440 pixel 210 PPI, B140QAN02.0, IPS, glossy: yes, HDR
Mainboard
Intel Cannon Lake-U PCH-LP Premium
Storage
Toshiba XG6 KXG60ZNV1T02, 1024 GB
, 902 GB free
Weight
1.466 kg, Power Supply: 345 g
Links
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.
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B140QAN02.0 tested with X-Rite i1Pro 2
Maximum: 495 cd/m² (Nits) Average: 467.4 cd/m² Minimum: 4.7 cd/m²Brightness Distribution: 90 %
Center on Battery: 487 cd/m²
Contrast: 1736:1 (Black: 0.28 cd/m²)
ΔE Color 1.9 | 0.5-29.43 Ø4.91, calibrated: 0.8
ΔE Greyscale 2.4 | 0.5-98 Ø5.2
100% sRGB (Argyll 1.6.3 3D)
88.7% AdobeRGB 1998 (Argyll 1.6.3 3D)
99.7% AdobeRGB 1998 (Argyll 2.2.0 3D)
100% sRGB (Argyll 2.2.0 3D)
87.2% Display P3 (Argyll 2.2.0 3D)
Gamma: 2.25
| Lenovo ThinkPad T490-20N30000GE B140QAN02.0, IPS, 2560x1440, 14" | Lenovo ThinkPad T490-20N3S02L00 NE140FHM-N61, IGZO IPS LED, 1920x1080, 14" | Lenovo ThinkPad X1 Carbon 2018-20KGS03900 B140QAN02.0, IPS, 2560x1440, 14" | Average of class Office | |
|---|---|---|---|---|
| Screen | -59% | -5% | -99% | |
| Brightness middle | 486 | 418 -14% | 578 19% | 385 ? -21% |
| Brightness | 467 | 400 -14% | 533 14% | |
| Brightness Distribution | 90 | 88 -2% | 84 -7% | |
| Black Level * | 0.28 | 0.24 14% | 0.38 -36% | 0.2643 ? 6% |
| Contrast | 1736 | 1742 0% | 1521 -12% | |
| Colorchecker dE 2000 * | 1.9 | 4.7 -147% | 1.9 -0% | 4.09 ? -115% |
| Colorchecker dE 2000 max. * | 3.6 | 8.7 -142% | 3.8 -6% | 10.3 ? -186% |
| Colorchecker dE 2000 calibrated * | 0.8 | 2.1 -163% | 0.8 -0% | 2.53 ? -216% |
| Greyscale dE 2000 * | 2.4 | 5.9 -146% | 3 -25% | 3.9 ? -63% |
| Gamma | 2.25 98% | 2.06 107% | 2.14 103% | 71.6 3% ? |
| CCT | 6464 101% | 7350 88% | 6377 102% | 6847 95% ? |
| Color Space (Percent of AdobeRGB 1998) | 88.7 | 59.9 -32% | 88.8 0% | |
| Color Space (Percent of sRGB) | 100 | 92.1 -8% | 100 0% |
* ... smaller is better
Display Response Times
ℹ
Display response times show how fast the screen is able to change from one color to the next. Slow response times can lead to afterimages and can cause moving objects to appear blurry (ghosting). Gamers of fast-paced 3D titles should pay special attention to fast response times.| ↔ Response Time Black to White | ||
|---|---|---|
| 20 ms ... rise ↗ and fall ↘ combined | ↗ 7.6 ms rise |  |
| ↘ 12.4 ms fall | ||
| The screen shows good response rates in our tests, but may be too slow for competitive gamers. In comparison, all tested devices range from 0.1 (minimum) to 240 (maximum) ms. » 39 % of all devices are better. This means that the measured response time is similar to the average of all tested devices (20.9 ms). | ||
| ↔ Response Time 50% Grey to 80% Grey | ||
| 51.2 ms ... rise ↗ and fall ↘ combined | ↗ 24.4 ms rise |  |
| ↘ 26.8 ms fall | ||
| The screen shows slow response rates in our tests and will be unsatisfactory for gamers. In comparison, all tested devices range from 0.165 (minimum) to 636 (maximum) ms. » 87 % of all devices are better. This means that the measured response time is worse than the average of all tested devices (32.8 ms). | ||
Screen Flickering / PWM (Pulse-Width Modulation)
ℹ
To dim the screen, some notebooks will simply cycle the backlight on and off in rapid succession - a method called Pulse Width Modulation (PWM) . This cycling frequency should ideally be undetectable to the human eye. If said frequency is too low, users with sensitive eyes may experience strain or headaches or even notice the flickering altogether.| Screen flickering / PWM not detected |  | ||
In comparison: 53 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 8705 (minimum: 5 - maximum: 343500) Hz was measured. | |||
Power Consumption
| Off / Standby |   0.28 / 0.61 Watt |
| Idle |  3.84 / 9.5 / 12.9 Watt |
| Load |
53.6 / 66.9 Watt |
    
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Key:
min: ,
med: ,
max: Metrahit Energy | |
Pros
+ 坚固的高品质机身
+ 比前代产品更紧凑，更轻巧
+ 各种接口
+ 非常舒适的输入设备
+ 高色域高亮度的屏幕
+ 高于平均的CPU性能
+ 25W的GPU
+ 风扇大部分不运转
Cons
- 非常反光，功耗需求大大增加
- sRGB没有颜色配置文件
- D面难拆开
- 半速雷电3
- 缺少可更换电池
- 外壳温度高
- 在压力测试中有降频
- 没有全尺寸SD卡读卡器
Verdict – The WQHD panel is just not quite suitable for the T490
亮面WQHD面板在ThinkPad T490中并没有真正说服我们。一方面，图像质量非常好，并且那些需要在笔记本电脑屏幕具有尽可能高的色彩空间覆盖范围的人可以毫不犹豫地抓住它。去年，我们的看法可能会更加乐观，但是对于新的1080p选项，联想已经提供了非常出色和明亮的面板，而且是雾面屏，需要的功率更少，我们认为总体而言，它更适合于移动商务设备（如ThinkPad T490）。
虽然WQHD面板可提供出色的图像质量，但它太反光，并大大减少了续航时间。那些可以接受较差sRGB色彩的人应该选择新的低功耗1080p面板。
除此之外，我们在详细介绍带有Core i7和GeForce MX250的ThinkPad T490时已经指出的所有其他的优点和缺点。
Lenovo ThinkPad T490-20N30000GE
- 09/12/2019 v7 (old)
Andreas Osthoff
Office - Weighted Average
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