Dell UltraSharp U3421WE Manuel utilisateur

Dell UltraSharp 34 Curved USB-C

Hub Monitor - U3421WE

User’s Guide

Model: U3421WE

Regulatory model: U3421WEb

NOTE: A NOTE indicates important information that helps you make

better use of your computer.

CAUTION: A CAUTION indicates potential damage to hardware or loss

of data if instructions are not followed.

WARNING: A WARNING indicates a potential for property damage,

personal injury, or death.

are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective

owners.

2020 - 12

Rev. A00

│  3

Contents

About your monitor . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Package contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Product features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Identifying parts and controls . . . . . . . . . . . . . . . . . . . . . . 9

Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Monitor specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Resolution specifications. . . . . . . . . . . . . . . . . . . . . . . . . 15

Supported video modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Preset display modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Plug and play capability . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Universal Serial Bus (USB) interface . . . . . . . . . . . . . . . . 21

USB 3.2 upstream connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

USB 3.2 downstream connector . . . . . . . . . . . . . . . . . . . . . . . . . . 22

USB Type-C connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

USB ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

RJ45 connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Support OS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

LCD monitor quality and pixel policy . . . . . . . . . . . . . . . . 25

Maintenance guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Cleaning your monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4  │ 

Setting up the monitor . . . . . . . . . . . . . . . . . . . . . . .27

Attaching the stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Connecting your monitor . . . . . . . . . . . . . . . . . . . . . . . . . 30

Connecting the DisplayPort (DisplayPort to DisplayPort) cable. . 30

Connecting the HDMI cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Connecting the USB Type-C cable . . . . . . . . . . . . . . . . . . . . . . . . 32

Connecting the super speed USB 5 Gbps (USB 3.2 Gen1) cable. . 33

Connecting the monitor for RJ45 Cable (Optional) . . . . . . . . . . . 34

Organizing your cables. . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Removing the monitor stand . . . . . . . . . . . . . . . . . . . . . . 35

VESA wall mounting (optional) . . . . . . . . . . . . . . . . . . . . 35

Operating the monitor . . . . . . . . . . . . . . . . . . . . . . .37

Power on the monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Using the Joystick Control. . . . . . . . . . . . . . . . . . . . . . . . 37

Using the On-Screen Display (OSD) menu . . . . . . . . . . . 39

Accessing the menu system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

OSD warning message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Setting the maximum resolution . . . . . . . . . . . . . . . . . . . 61

Setting the KVM switch . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Setting the Auto KVM . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Using the tilt, swivel, vertical extension, 

and slant adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Tilt, swivel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Vertical extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Slant adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Built-in diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70



│  5

Always On USB Type-C Charging . . . . . . . . . . . . . . . . . . 72

Common problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Product specific problems . . . . . . . . . . . . . . . . . . . . . . . . 76

Universal Serial Bus (USB) specific problems . . . . . . . . . 77

Speakers Specific Problems . . . . . . . . . . . . . . . . . . . . . . 79

Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

FCC notices (U.S. only) and other regulatory 

information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Contact Dell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

EU product database for energy label and product

information sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

6  │  About your monitor

About your monitor

Package contents

Your monitor ships with the components shown in the table below. If any

component is missing, contact Dell technical support. For more information, see

Contact Dell.

NOTE: Some items may be optional and may not ship with your monitor.

Some features may not be available in certain countries.

NOTE: If you are attaching a stand that you purchased from any other

source, follow the set up instructions that were included with the

stand.

Display

Stand riser

Stand base

About your monitor  │  7

Power cable (varies by

country)

DisplayPort cable (DP to DP)

HDMI cable

USB Type-C cable

Super speed USB 5 Gbps

(USB 3.2 Gen1) Upstream

Cable (Enables the USB

Ports on the Monitor)

• Quick Setup Guide

•Factorycalibrationreport

• Safety, Environmental,

and Regulatory

Information

8  │  About your monitor

Product features

The Dell U3421WE monitor has an active matrix, Thin-Film Transistor (TFT), Liquid

Crystal Display (LCD) and LED backlight. The monitor features include:

• 86.72 cm (34.14 in.) viewable area (measured diagonally). 

3440 x 1440 (21:9) resolution, plus full-screen support for lower resolutions.

• Wide viewing angle to allow viewing from a sitting or standing position.

• Color gamut of sRGB 99% and Rec 709 99% with an average Delta E < 2;

also supports DCI-P3 95%.

• Digital connectivity with DisplayPort, USB Type-C and HDMI.

• Single USB Type-C to supply power (PD 90 W) to a compatible notebook

while receiving video & data signal.

• Tilt, swivel, height, and slant adjust capabilities.

• Ultra-thin bezel minimizes the bezel gap in multi-monitor usage, enabling

easier setup with an elegant viewing experience.

• Removable stand and Video Electronics Standards Association (VESA™)

100 mm mounting holes for flexible mounting solutions.

• Equipped with 1 USB Type-C upstream port, 1 USB Type-C downstream port, 1

super speed USB 5 Gbps (USB 3.2 Gen1) Type B upstream port, 1 super speed

USB 5 Gbps (USB 3.2 Gen1) Type-A downstream charging port, and 3 super

speed USB 5 Gbps (USB 3.2 Gen1) Type-A downstream ports.

• USB-C and RJ45 ports enable a single-cable, network-connected experience.

• Plug and play capability if supported by your system.

• On-Screen Display (OSD) adjustments for ease of set-up and screen

optimization.

• Supports Picture by Picture (PBP) and Picture in Picture (PIP) Select mode.

• The built-in KVM switch al lows you to control up to 2 computers from a single

set of keyboard and mouse connected to the monitor.

• Supports Auto KVM for multiple input setup.

• Power and OSD buttons lock.

• Security lock slot.

• Stand lock.

• < 0.3 W in Standby Mode.

• Built-in speakers (5 W) x 2.

About your monitor  │  9

• Optimize eye comfort with a flicker-free screen.

WARNING: The possible long-term effects of blue light emission from

the monitor may cause damage to the eyes, including eye fatigue,

digital eye strain, and so on. ComfortView feature is designed to reduce

the amount of blue light emitted from the monitor to optimize eye

comfort.

Identifying parts and controls

Front view

Label Description Use

1Power LED indicator Solid white light indicates that the

monitor is turned on and functioning

normally. Blinking white light

indicates that the monitor is in

Standby Mode.

10  │  About your monitor

Back view

Back view with monitor stand

Label Description Use

1VESA mounting holes (100 mm

x 100 mm - behind attached

VESA Cover)

Wall mount monitor using VESA-

compatible wall mount kit (100 mm x

100 mm).

2Regulatory label Lists the regulatory approvals.

3Stand release button Releases stand from the monitor.

4Barcode, serial number, and

Service T

ag label

Refer to this label if you need to

contact Dell for technical support.

5Power On/Off button To turn the monitor on or off.

6Joystick Use to control the OSD menu. (For

more Information, see Operating

the monitor)

7Cable-management slot Use to organize cables by inserting

them through the slot.

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