39.7" Dell U4021QW - Specifications
Brand, series, model
Information about the brand, series, model and model aliases.
Name of the company-manufacturer.
Name of the series, which the model belongs to.
Designation of the model.
Other known designations of the model.
The year in which this model was announced.
Information about the main characteristics of the display - panel, backlight, resolution, refresh rate, etc.
Size class of the display as declared by the manufacturer. Often this is the rounded value of the actual size of the diagonal in inches.
|39.7 in (inches)|
Approximate diagonal size of the display. If the manufacturer does not provide such information, the diagonal is calculated from the width and height of the screen.
|1008.59 mm (millimeters)|
100.859 cm (centimeters)
39.7083 in (inches)
3.309 ft (feet)
Approximate width of the display. If the manufacturer does not provide such information, the width is calculated from the diagonal and the aspect ratio.
|929.28 mm (millimeters)|
92.928 cm (centimeters)
36.5858 in (inches)
3.0488 ft (feet)
Approximate height of the display. If the manufacturer does not provide such information, the height is calculated from the diagonal and the aspect ratio.
|392.04 mm (millimeters)|
39.204 cm (centimeters)
15.4346 in (inches)
1.2862 ft (feet)
|Radius of curvature|
There are curved displays, whose curve is part of a circumference (arc). In order to give more precise information about the curve of the screen, often the manufacturer provides data about the radius of this circumference. The smaller the radius, the larger the screen curve.
|2500 mm (millimeters)|
250 cm (centimeters)
98.4252 in (inches)
8.2021 ft (feet)
There are various panel technologies. Each has its own specific features - viewing angles, color reproduction, response time, brightness/contrast, production cost, etc. The image quality depends directly on the type of the display panel used.
|Panel bit depth|
The most widely used panels are those with 6, 8, and 10 bits for each of the RGB components of the pixel. They provide 18-, 24-, and 30-bit color, respectively.
The maximum number of colors, which the display is able to reproduce, depends on the type of the panel in use and color enhancing technologies like FRC.
The ratio between the horizontal and the vertical side of the display. Some of the standard and widely used aspect ratios are 4:3, 5:4, 16:9 and 16:10.
Information about the number of pixels on the horizontal and vertical side of the screen. A higher resolution allows the display of a more detailed and of higher quality image.
|5120 x 2160 pixels|
The pixel pitch shows the distance from the centers of two neighboring pixels. In displays, which have a native resolution (the TFT ones, for example), the pixel pitch depends on the resolution and the size of the screen.
|0.182 mm (millimeters)|
0.0182 cm (centimeters)
0.0071 in (inches)
0.0006 ft (feet)
Information of the number of pixels in a unit of length. With the decrease of the display size and the increase of its resolution, the pixel density increases.
|140 ppi (pixels per inch)|
55 ppcm (pixels per centimeter)
The percentage of the approximate area, taken by the active part of the screen, to the total front area.
|91.83 % (percent)|
The backlight is the source of light of the LCD display panels. The type of backlight determines the image quality and the color space of the display. There are various backlights such as CCFL, LED, WLED, RGB-LED, and etc.
sRGB is a color space, developed jointly by Hewlett-Packard and Microsoft in 1996. It is used in different devices such as printers, displays, TV sets, cameras, etc. The sRGB color space covers about 72% of the NTSC color space.
|100 % (percent)|
DCI P3 is a color space, introduced in 2007 by the SMPTE. It is used in digital cinema and has a much wider gamut than the sRGB.
|98 % (percent)|
Information about the brightness of the screen. It is measured in candela per square metre (cd/m²).
|300 cd/m² (candela per square meter)|
The static contrast shows the ratio between the brightest and the darkest color, which the display can reproduce simultaneously, for example, within one and the same frame/scene.
|1000 : 1|
|Horizontal viewing angle|
Information about the maximum horizontal viewing angle, within which the image on the screen is of acceptable quality.
|178 ° (degrees)|
|Vertical viewing angle|
Information about the maximum vertical viewing angle, within which the image on the screen is of acceptable quality.
|178 ° (degrees)|
|Minimum response time|
Information about the minimum amount of time, in which the pixels change from one color to another. Very often the manufacturer provides the response time for transition from grey-to-grey (G2G).
|5 ms (milliseconds)|
0.0050 s (seconds)
|Average response time|
Information about the average amount of time, in which the pixels change from one color to another.
|8 ms (milliseconds)|
0.0080 s (seconds)
Desktop monitors and smart TVs experience a latency/lag in visualizing the information. The time in milliseconds that the display needs to visualize the signal input.
|8.9 ms (milliseconds)|
0.0089 s (seconds)
Information about the type of coating of the display. There are different types of matte and glossy coatings, each of which has its own advantages and drawbacks.
3D displays use various technologies to achieve a 3D effect. Each of these technologies has its own advantages and drawbacks.
Information on whether 3D is supported or not.
Information about the horizontal and vertical refresh rates/frequencies.
|Horizontal frequency (digital)|
The horizontal scan rate/frequency shows the number of horizontal lines, displayed by the monitor per second, when it is plugged to a digital source.
|27 kHz - 133 kHz (kilohertz)|
|Vertical frequency (digital)|
The vertical frequency/refresh rate shows how many times in a second the image on the screen is refreshed.
|24 Hz - 86 Hz (hertz)|
Power supply and consumption
Information about the power supply and consumption, energy efficiency class, etc.
Permissible voltage tolerance in a 110-volt electric system.
|100 V - 120 V (volts)|
Permissible voltage tolerance in a 220-volt electric system.
|220 V - 240 V (volts)|
|Alternating current frequency|
Requirement regarding the alternating current frequency in the electric system.
|50 Hz - 60 Hz (hertz)|
|Electric current (A)|
Requirement regarding the electric current rating in amperes (A) of the electric system.
|3 A (amperes)|
|Power consumption (sleep)|
Power consumption in sleep/stand by/suspend mode.
|0.5 W (watts)|
|Power consumption (average)|
Average power consumption in standard work mode.
|51.5 W (watts)|
|Power consumption (maximum)|
The maximum possible power consumption.
|240 W (watts)|
|Power consumption (annual)|
Estimated power consumption per year in kWh.
|140.86 kWh (kilowatt-hours)|
Dimensions, weight and color
Information about the dimensions and the weight of the specific model with and without stand as well as the colors, in which it is offered to the market.
Width without stand in different measurement units.
|946.6 mm (millimeters)|
94.66 cm (centimeters)
37.2677 in (inches)
3.1056 ft (feet)
Height without stand in different measurement units.
|419.1 mm (millimeters)|
41.91 cm (centimeters)
16.5 in (inches)
1.375 ft (feet)
Depth without stand in different measurement units.
|59.6 mm (millimeters)|
5.96 cm (centimeters)
2.3465 in (inches)
0.1955 ft (feet)
Weight without stand in different measurement units.
|9.5 kg (kilograms)|
20.94 lbs (pounds)
|Width with stand|
Width with stand in different measurement units.
|946.6 mm (millimeters)|
94.66 cm (centimeters)
37.2677 in (inches)
3.1056 ft (feet)
|Height with stand|
Height with stand in different measurement units.
|457.8 mm (millimeters)|
45.78 cm (centimeters)
18.0236 in (inches)
1.502 ft (feet)
|Depth with stand|
Depth with stand in different measurement units.
|248 mm (millimeters)|
24.8 cm (centimeters)
9.7638 in (inches)
0.8136 ft (feet)
|Weight with stand|
Weight with stand in different measurement units.
|13.8 kg (kilograms)|
30.42 lbs (pounds)
Weight of the product with all accessories and packaging in different measurement units.
|21.6 kg (kilograms)|
47.62 lbs (pounds)
Width of the stand or distance between the legs in different measurement units.
|385 mm (millimeters)|
38.5 cm (centimeters)
15.1575 in (inches)
1.2631 ft (feet)
Depth of the stand in different measurement units.
|247 mm (millimeters)|
24.7 cm (centimeters)
9.7244 in (inches)
0.8104 ft (feet)
Information about the colors, in which the specific model is offered to the market.
|Black and Silver|
Information about the ergonomic functions - height adjustment, swivel angles, tilt angles, etc.
Information about whether there is a possibility for wall mounting according to the VESA Mounting Interface Standard (MIS).
There are many various interfaces under the VESA standard, which differ in the size of the brackets, the distances between the screw holes and their number.
|100 x 100 mm|
Information about whether the stand can be dismounted. Usually, this is required for wall mounting.
Information about whether the stand allows height adjustment.
|Height adjustment range|
Information about the extent to which the stand allows the height to be adjusted.
|120 mm (millimeters)|
12 cm (centimeters)
4.7244 in (inches)
0.3937 ft (feet)
Some displays have the ability to operate in landscape and portrait mode alike.
Information whether the display can be swiveled around the stand axis.
Maximum swivel degree of the display to the left of the stand axis.
|35 ° (degrees)|
Maximum swivel degree of the display to the right of the stand axis.
|35 ° (degrees)|
Most displays have the ability to be tilted forward and backward as to provide a more comfortable viewing position for the user.
Maximum degree of forward tilting of the display.
|5 ° (degrees)|
Maximum degree of backward tilting of the display.
|20 ° (degrees)|
Information about the audio system - number and power of the built-in speakers, supported audio technologies.
The speaker is a device, which converts electrical audio signals into acoustic vibrations resulting in corresponding sounds.
|2 x 9 W (watts)|
Many contemporary desktop monitors and smart TV sets have built-in cameras.
Information whether the current model has a built-in camera or not.
Available connectivity ports, slots and interfaces.
Information about the available connectivity ports, slots and interfaces such as USB, infrared port, SD card slot, audio/video and network interfaces, etc.
|4 x USB 3.2 (Type-A; Gen 1; downstream)|
1 x USB 3.2 (Type-B; Gen 1; upstream)
1 x USB 3.2 (Type-C; Gen 2; downstream; 15W)
1 x Ethernet RJ45 (Gigabit)
2 x HDMI 2.0
1 x DisplayPort 1.4
1 x Thunderbolt 3.0 (Type-C; upstream; 90W; DP Alt Mode)
1 x 3.5 mm Audio Out (line-out for speakers)
|High-bandwidth Digital Content Protection (HDCP) 2.2|
Some additional functional features of the model.
Information about additional software features, technologies, functions and services of the model.
Low Blue Light
Operating and storage conditions
There are certain requirements for the environmental conditions, in which the display should be used and stored in order to function properly.
The operating temperature shows the safe temperature range (from minimum to maximum), within which the display will function flawlessly. Outside this range it might operate improperly and/or fail entirely.
|0 °C - 40 °C (degrees Celsius)|
32 °F - 104 °F (degrees Fahrenheit)
The operating humidity shows the acceptable level of humidity, in which the display will function flawlessly. It sets a lower and an upper humidity level for safe operation and is measured in percentage.
|10 % - 80 % (percent)|
The operating altitude shows the maximum admissible altitude, at which the display will function flawlessly. Above this level it might not operate properly and/or might seize to function.
|5000 m (meters)|
16404.2 ft (feet)
The storage temperature shows the range from a minimum to a maximum temperature, within which storing of the display is considered to be safe.
|-20 °C - 60 °C (degrees Celsius)|
-4 °F - 140 °F (degrees Fahrenheit)
The storage humidity shows the lower and upper humidity limit, which ensures safe storage of the display. Storing it outside these limits might damage the display.
|5 % - 90 % (percent)|
The storage altitude shows the maximum possible altitude for secure storing of the display. Storing it above this limit may result in damaging the display.
|12192 m (meters)|
40000 ft (feet)
Often the packaging of desktop monitors and smart TV sets includes accessories for them.
Information about some of the main accessories included in the standard packaging of the current model.
Thunderbolt 4 (USB-C) Active Cable
USB Type-A to Type-B cable
Information about other features.
Information about other features of the current model, which are important and have to be specified.
|Security lock slot|