[Tech Review] eDP Test Applications

07 Jan 2021

The embedded DisplayPort (eDP), defined by the Video Electronics Standards Association (VESA) offers high bandwidth (HBR3 up to 8.1Gbps/lane) and reduced system power consumption. Owing to these characteristics, the video interface has been widely used in notebooks and tablets. As panel resolution increases and handheld devices consume less power, the following functions will become more important:

MSO (Multi-SST Operation, SST: Single Stream Transport )

Considering volume, power consumption, and costs, the eDP panel is designed with MSO, which can be divided into the following three all-new drive modes. In test applications, the signal device output must correspond to the MSO standard video signal format for output. Chroma offers FPD (Flat Panel Display) testers that perform spot testing to ensure the correct display format.

▲Two SST Links, One Lane each (2x1) ▲Two SST Links, Two Lanes each (2x2) ▲Four SST Links, One Lane each (4x1)


DSC (Display Stream Compression)

This function transmits even higher resolution video signals within the original transmission bandwidth, through compression and decompression protocols on both transmitting and receiving ends.

PSR (Panel Self Refresh) 

In order to effectively reduce the power consumption of the overall system, PSR technology is used to automatically display the screen stored in TCON when the screen is still. As a result, the video transmission terminal can pause operation to reduce power consumption. Chroma's FPD testers support both PSR functionality, as well as control the opening/closing of the Main Link for video data and the timing of image capture, according to the specifications.

PSR2 (Panel Self Refresh 2 )

The PSR2 function is advanced in that it can choose the screen area for selective updates. Chroma's test equipment can set the size of the refresh area, as well as support ALPM (Advanced Link Power Management) test functionality.

VRR (Variable Refresh Rate)

Matching with e-sport products used in high-speed display applications, the display refresh rate is adjusted according to the image processing speed. The VRR function serves to avoid flickering, tearing, or stuttering of the screen. Chroma's testers support VRR video signal output, have a flexible frame rate and a variable number of segments to fully support corresponding tests.

Chroma provides complete solutions for all abovementioned video signal applications. Please follow the links below to learn more about product details and specifications, or leave an inquiry with your testing needs. We are happy to be of service!