DisplayPort is a commonly used interface in e.g. graphics cards, monitors, and laptops. It is also widely used in USB-C devices to transfer video and audio via DisplayPort Alternate Mode. DisplayPort standard is managed by the Video Electronics Standard Association (VESA).

Resolutions up to 16K

DisplayPort 1.0 standard was first released in 2006. In 2019 VESA officially released the latest DisplayPort 2.0 version increasing the total bandwidth to 77.37 Gbit/s enabling resolutions up to 16K@60Hz with DisplayPort Stream Compression (DSC).

Source: VESA

E-learning center: All you need to know about DisplayPort

E-learning center: Introducing DisplayPort 2.0

DisplayPort Stream Compression

VESA, the Video Electronics Standards Association, published a new Standard in 2014 that uses visually lossless image compression to increase the amount of data carried by a display interface data rate, saving power. For example, DisplayPort 1.4a supports 8K video at 60Hz and 24-bit color using a low 2:1 compression ratio or 30-bit color using a low 2.5:1 compression ratio, which will provide visually lossless image quality (indistinguishable from the original image). (Source: VESA)

E-learning center: DSC

What to Test in DisplayPort Interface?

Proper testing of DisplayPort interfaces requires testing of multiple DisplayPort specific features. Besides video and audio, testing of e.g. HDCP, DPCD, EDID and analyzing of AUX Channel traffic are crucial in ensuring the functionality of DisplayPort receivers, transmitters and repeaters. For a detailed explanation of testing of DisplayPort interface, click the link below.

E-learning center: What To Test in DisplayPort interface


DisplayPort Compliance Testing

As there are hundreds of manufacturers making DisplayPort devices, compliance testing according to VESA and DCP standards is the only way to ensure interoperability between different DisplayPort devices available on the market. Also, only by using certified compliance test tools you can obtain the DisplayPort certification.

DP 2.0 Link Layer Compliance Tests

DisplayPort version 2.0 was officially published in 2019. In 2021 Unigraf introduced a DP 2.0 Test Tool UCD-500. UCD-500 is a DisplayPort™ 2.0 Video Generator and Analyzer unit for testing DisplayPort Sinks and Sources up to 8K@60Hz and 16K@60 Hz (with DSC) video modes with UHBR 20 Max Bit Rate Capability. DP 2.0 Sink and Source Link Layer CTS tests are available with UCD-500 as an add-on licenses.

Please refer to the DP CTS Tool Options for Unigraf UCD-500 for detailed information about the DP 2.0 Link Layer CTS tests for DisplayPort Sinks and Sources.

DP 1.4 Link Layer Compliance Tests

DisplayPort version 1.4 was first published in 2016, and it was updated to 1.4a in 2018. Unigraf continued a pioneering approach to DisplayPort Link Layer CTS Test Tools by introducing UCD-400, a HBR3 capable 8K video analyzer and generator. The selection of tests available for UCD-400 provides all tests needed for VESA Certified DP 1.4a Link Layer CTS including DSC testing for DisplayPort Sink and Source devices.

Please refer to the DisplayPort Compliance Test Tool Options for UCD-400for detailed information about the DP 1.4a Link Layer CTS tests for DisplayPort Sink and Source devices.

More information: Compliance Testing

CTS Test Set Controlled via PC GUI

UCD-Console is a common GUI for all UCD-300/400/500 series products. For DP 1.4a Link Layer CTS testing UCD Console features ready-made test sets that you can easily select, run and monitor. Watch the video below to see how easily you can perform DP 1.4a Link Layer CTS tests on DisplayPort Sink and Source device.

HDCP 2.3 Compliance Tests

In 2018 VESA announced that it now requires HDCP testing as part of the DP testing requirement for certification. If a DisplayPort transmitter or receiver supports HDCP (as reported in the product CDF) it shall be tested as part of the certification requirements for obtaining the DP Logo. (Source: VESA)

Unigraf offers a range of DCP approved HBR2 and HBR3 capable HDCP 2.3 CTS Test Tools.

E-learning center: HDCP 2.3 Compliance Testing

Dolby Vision™ for DisplayPort

What is Dolby Vision™?

Dolby has worked closely with industry leaders over the last 50 years to make the stories and experiences as engaging as possible—first with noise reduction, then 5.1 surround and 7.1 surround, and now with Dolby Vision™. Dolby Vision™ transforms the way you experience movies, TV shows, and games with incredible brightness, contrast, and color that bring entertainment to life before your eyes. By fully leveraging the maximum potential of new cinema projection technology and new TVs’ display capabilities, Dolby Vision™ delivers high-dynamic-range (HDR) and wide-color-gamut content. The result is a refined, lifelike image that will make you forget you are looking at a screen.

4K televisions have “more pixels” and newer standards for UHD TV also include high frame rates, but these standards don’t make each pixel able to better represent the full range of brightness we see in reality. Dolby Vision™ is the Dolby Laboratories solution to meet this challenge. The current TV and Blu-ray standards limit maximum brightness to 100 nits and minimum brightness to 0.117 nits, while also limiting the range of colours that can be displayed. Dolby Vision™ colour depth allows up to 10,000-nit maximum brightness. (Dolby 2016)

Dolby Vision Testing

In the compatibility test for Dolby Vision™ Unigraf will provide playback and capturing of the test video and audio content with UCD-series test tools. Dolby will provide customers with the SDK (Software Development Kit) that enables analyzing the Dolby Vision™ video captured with UCD-series test tools. UCD-series test tools also support Dolby Vision signaling test using Dolby Vision VSIF and Dolby Vision Vendor Specific Extended Metadata Packets (EMP) using TMDS. With the Dolby SW package, UCD-series test tools are a mandatory tool for any e.g. television or monitor manufacturer that is willing to have a Dolby Vision™ certificate on their products.


UCD-451 is an approved video generator for testing Dolby Vision on DisplayPort™ 1.4a sink devices with HBR3 max bit rate capability. Thanks to an extended 32GB memory, UCD-451 enables the verification of 8K Dolby Vision™ content. With the Dolby SW package, UCD-451 is a mandatory tool for any monitor manufacturer willing to have a Dolby Vision certificate on their products.

More information: UCD-451

Unigraf DisplayPort Test Tools

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