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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

像素更高，续航更差。 像之前的ThinkPad X1 Extreme一样，14英寸的ThinkPad T490也有了具有100％AdobeRGB色彩空间覆盖率的高分辨率WQHD面板。 出色的图像质量带来了亮面屏和增加的功耗。
Laptop / Notebook ThinkPad Ultrabook Whiskey Lake Windows
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, Memory: 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
Soundcard
Intel Cannon Lake-LP - cAVS
Connections
3 USB 3.0 / 3.1 Gen1, 1 USB 3.1 Gen2, 1 Thunderbolt, 1 HDMI, 2 DisplayPort, 1 Kensington Lock, Audio Connections: 3.5 mm立体声插孔, Card Reader: mSD UHS-I, 1 SmartCard, 1 Fingerprint Reader, NFC
Networking
Intel Ethernet Connection I219-V (10/100/1000MBit/s), Intel Wireless-AC 9560 (a/b/g/n = Wi-Fi 4/ac = Wi-Fi 5/), Bluetooth 5.0
Size
height x width x depth (in mm): 18.9 x 339 x 227
Battery
50 Wh Lithium-Ion
Operating System
Microsoft Windows 10 Pro 64 Bit
Camera
Webcam: HD网络摄像头
Additional features
Speakers: 2W扬声器, Keyboard: 六排背光键盘, Keyboard Light: yes, 65W Type-C 充电器, 36 Months Warranty
Weight
1.466 kg, Power Supply: 345 g
Links
Lenovo homepage
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.

 

466
cd/m²		495
cd/m²		459
cd/m²
458
cd/m²		486
cd/m²		444
cd/m²
481
cd/m²		470
cd/m²		448
cd/m²
Distribution of brightness
B140QAN02.0 tested with X-Rite i1Pro 2
Maximum: 495 cd/m² (Nits) Average: 467.4 cd/m² Minimum: 4.7 cd/m²
Brightness Distribution: 90 %
Center on Battery: 487 cd/m²
Contrast: 1736:1 (Black: 0.28 cd/m²)
ΔE Color 1.9 | 0.5-29.43 Ø5, calibrated: 0.8
ΔE Greyscale 2.4 | 0.57-98 Ø5.3
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, 14.00		Lenovo ThinkPad T490-20N3S02L00
NE140FHM-N61, IGZO IPS LED, 1920x1080, 14.00		Lenovo ThinkPad X1 Carbon 2018-20KGS03900
B140QAN02.0, IPS, 2560x1440, 14.00		Average of class Office
 
Screen
-59%
-5%
-88%
Brightness middle
486
418
-14%
578
19%
365 ?(199 - 1284, n=107, last 2 years)
-25%
Brightness
467
400
-14%
533
14%
Brightness Distribution
90
88
-2%
84
-7%
Black Level *
0.28
0.24
14%
0.38
-36%
0.2672 ?(0 - 0.89, n=111, last 2 years)
5%
Contrast
1736
1742
0%
1521
-12%
Colorchecker dE 2000 *
1.9
4.7
-147%
1.9
-0%
4.14 ?(0.8 - 13.2, n=107, last 2 years)
-118%
Colorchecker dE 2000 max. *
3.6
8.7
-142%
3.8
-6%
10.6 ?(1.4 - 24.7, n=107, last 2 years)
-194%
Colorchecker dE 2000 calibrated *
0.8
2.1
-163%
0.8
-0%
2.47 ?(0.44 - 5.72, n=92, last 2 years)
-209%
Greyscale dE 2000 *
2.4
5.9
-146%
3
-25%
3.87 ?(0.8 - 14.1, n=107, last 2 years)
-61%
Gamma
2.25 98%
2.06 107%
2.14 103%
63.1 3% ?(1.855 - 6451, n=106, last 2 years)
CCT
6464 101%
7350 88%
6377 102%
6860 95% ?(5966 - 15924, n=106, last 2 years)
Color Space (Percent of AdobeRGB 1998)
88.7
59.9
-32%
88.8
0%
37.8 ?(last 2 years)
-57%
Color Space (Percent of sRGB)
100
92.1
-8%
100
0%
54.4 ?(last 2 years)
-46%

* ... 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. » 37 % of all devices are better.
This means that the measured response time is similar to the average of all tested devices (21.5 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 0.2 (minimum) to 636 (maximum) ms. » 86 % of all devices are better.
This means that the measured response time is worse than the average of all tested devices (33.7 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 17900 (minimum: 5 - maximum: 3846000) Hz was measured.

Power Consumption
Off / Standbydarklight 0.28 / 0.61 Watt
Idledarkmidlight 3.84 / 9.5 / 12.9 Watt
Load midlight 53.6 / 66.9 Watt
 color bar
Key: min: dark, med: mid, max: light        Metrahit Energy
Currently we use the Metrahit Energy, a professional single phase power quality and energy measurement digital multimeter, for our measurements. Find out more about it here. All of our test methods can be found here.
Battery Runtime
H.264
Lenovo ThinkPad T490-20N30000GE
i7-8565U, GeForce MX250, 50 Wh, 2560x1440
478 min
Lenovo ThinkPad T490-20N2004EGE
i5-8265U, UHD Graphics 620, 50 Wh, 1920x1080
677 min
Lenovo ThinkPad T490-20N3S02L00
i7-8565U, GeForce MX250, 50 Wh, 1920x1080
523 min
WiFi v1.3
Lenovo ThinkPad T490-20N30000GE
i7-8565U, GeForce MX250, 50 Wh, 2560x1440
352 min
Lenovo ThinkPad T490-20N2004EGE
i5-8265U, UHD Graphics 620, 50 Wh, 1920x1080
572 min
Lenovo ThinkPad T490-20N3S02L00
i7-8565U, GeForce MX250, 50 Wh, 1920x1080
543 min
Battery Runtime
WiFi Websurfing
5h 52min
Big Buck Bunny H.264 1080p
7h 58min

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

In review: Lenovo ThinkPad T490. Test unit provided by Lenovo Germany.
In review: Lenovo ThinkPad T490. Test unit provided by Lenovo Germany.

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
Andreas Osthoff

Chassis
85 / 98 → 87%
Keyboard
93%
Pointing Device
91%
Connectivity
0 / 80 → 0%
Weight
69 / 20-75 → 90%
Battery
71%
Display
89%
Games Performance
78 / 78 → 100%
Application Performance
87 / 95 → 91%
Temperature
86%
Noise
93%
Audio
55%
Camera
39 / 85 → 46%
Average
78%
87%
Office - Weighted Average

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> Notebookcheck中文版（NBC中国） > 评测 > 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
Andreas Osthoff, 2020-05- 2 (Update: 2020-05- 2)