25" Dell UltraSharp U2518D - Specifications

Name of the company-manufacturer.

Name of the series, which the model belongs to.

Designation of the model.

The year in which this model was announced.

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.

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.

Approximate width of the display. If the manufacturer does not provide such information, the width is calculated from the diagonal and the aspect ratio.

Approximate height of the display. If the manufacturer does not provide such information, the height is calculated from the diagonal and the aspect ratio.

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.

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.

Frame Rate Control (FRC) is a method, which allows the pixels to show more color tones. With quick cyclic switching between different color tones, an illusion for a new intermediate color tone is created. For example, by using FRC, a 6-bit display panel is able to show 16.7 millioin colors, which are typical for 8-bit display panels, and not the standard 262200 colors, instead. There are different FRC algorithms.

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.

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.

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.

The percentage of the approximate area, taken by the active part of the screen, to the total front area.

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.

Information about the brightness of the screen. It is measured in candela per square metre (cd/m²).

HDR expands the contrast ratio (peak luminance and minimal black levels) and color palette to achieve more details across the whole image - from the darkest parts to the brightest ones, which results in more realistic and life-like image.

Information about the maximum horizontal viewing angle, within which the image on the screen is of acceptable quality.

Information about the maximum vertical viewing angle, within which the image on the screen is of acceptable quality.

Information on whether 3D is supported or not.

The vertical frequency/refresh rate shows how many times in a second the image on the screen is refreshed.

Frame interpolation technologies differ according to the manufacturer and each has its own specific name.

The frame interpolation value as provided by the manufacturer. This value must not be confused with the refresh rate of the screen.

Some manufacturers name commercially the measurement unit of their own interpolation technologies as to denote the degree of interpolation. Very often the measurement unit is an abbreviation of the frame interpolation technology in use.

Permissible voltage tolerance in a 220-volt electric system.

Requirement regarding the alternating current frequency in the electric system.

Power consumption in off-mode.

Average power consumption in standard work mode.

The maximum possible power consumption.

Estimated power consumption per year in kWh.

The energy efficiency class/label provides general idea about the power consumption. There are different energy efficiency classes and each sets its own requirements regarding the power consumption. Some of the existent energy efficiency classes are A+++, A++, A+, A, B, C, D, E, F, G.

Width without stand in different measurement units.

Height without stand in different measurement units.

Depth without stand in different measurement units.

Weight without stand in different measurement units.

Width with stand in different measurement units.

Height with stand in different measurement units.

Depth with stand in different measurement units.

Width of the package in different measurement units.

Height of the package in different measurement units.

Depth of the package in different measurement units.

Weight of the product with all accessories and packaging in different measurement units.

Information about the colors, in which the specific model is offered to the market.

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.

Information about whether the stand can be dismounted. Usually, this is required for wall mounting.

Information about whether the stand allows height adjustment.

Some displays have the ability to operate in landscape and portrait mode alike.

Information whether the display can be swiveled around the stand axis.

Most displays have the ability to be tilted forward and backward as to provide a more comfortable viewing position for the user.

Information about the TV tuners, which the current model is equipped with.

The software instructions are performed by the CPU cores. The higher number of cores allows for the parallel (simultaneous) processing of more instructions and achieving higher performance. There are various processors equipped with 1, 2, 4, 6, 8, and more cores.

The operating systems of the smart TV sets feature user interface technologies for navigation and other ways of interaction with the smart TV - installing applications, internet browsing, video calls, sharing content with other users, playing videos and music, etc.

The speaker is a device, which converts electrical audio signals into acoustic vibrations resulting in corresponding sounds.

Information whether the current model has a built-in camera or not.

Information about the network technologies and standards supported by the model, which allow for it to connect to and communicate with other devices.

Information about the available connectivity ports, slots and interfaces such as USB, infrared port, SD card slot, audio/video and network interfaces, etc.

Information about additional software features, technologies, functions and services of the model.

Information about some of the main image file formats supported by the current model.

Information about some of the main audio file formats/codecs supported by the current model.

Information about some of the main video file formats/codecs supported by the current model.

List of the standards, certificates and licenses supported/received by the current model.

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.

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.

The storage temperature shows the range from a minimum to a maximum temperature, within which storing of the display is considered to be safe.

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.

Information about some of the main accessories included in the standard packaging of the current model.