Feature: Displays
DisplayPort 2.1 imposes more stringent specifications for the cables and physical layer used for signal transmission
thin devices like laptops and tablets. Another interesting feature of
DisplayPort 2.1 is that it imposes more stringent specifications for the cables and physical layer used for signal transmission. Enhanced shielding and low-loss design enable stable communication by minimising signal degradation, even over long distances. The new specifications also ensure
backward compatibility with existing certified cables.
Technical challenges The DisplayPort 2.1 standard demands significantly higher data rates, support
Figure 1: This Anritsu testing solution has been designed specifically to meet the challenges presented by the DisplayPort 2.1 certification
for increased resolutions and refresh rates, and advanced compatibility with other protocols like USB Type-C and Thunderbolt. As a result, signal integrity, stable communication and interoperability are becoming increasingly critical. For example, on the receiver side (sink), it is essential to evaluate signal reception quality, jitter tolerance and noise immunity, to ensure reliable signal transmission and operation. These tests verify the accurate and stable reception of video and audio signals. Furthermore, since DisplayPort 2.1 introduces advanced features such as
DP Alt Mode, it requires a thorough evaluation to ensure that sink devices comply with the specifications and support these capabilities. However, developing products that comply with the new standard faces a significant challenge: the time required to manually verify the transmission signal quality and perform calibration. This is due to the complexity of the test equipment settings and the lengthy configuration and testing procedures involved.
Sink testing Sink testing is a procedure used to verify whether DisplayPort receiver devices comply with the standard and can accurately receive and process signals. Typical devices tested include monitors, docking stations and DisplayPort- compatible products connected via USB Type-C. This testing evaluates signal quality and data transmission reliability by measuring parameters such as bit error rate (BER) and jitter tolerance.
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