Quantum Data Automated EDID Test
Extended display identification data (EDID) is a data structure provided by a digital display to describe its capabilities to a video source (e.g. DVD player or set-top box. EDID is defined by a standard published by the Video Electronics Standards Association (VESA). The EDID includes manufacturer name and serial number, product type, phosphor or filter type, timings supported by the display, display size, luminance data and (for digital displays only) pixel mapping data.
EDID is important in HDMI and HDMI extension products because issues can arise and knowledge is power. Being able to read the EDID of a display can be important when the capability of a particular display is unknown (does it do 720p or 1080p)? EDID issues arise when a single source is supplying video to more than one display where each display has different limitations in format (720 vs 1080). EDID issues limit the audio that will be delivered by a common source to both a surround sound setup and to a stereo setup. EDIDs can be valid or invalid and any given source can respond to an EDID from a particular display in a correctly or there can be problems.
The ability to test a particular source device to verify proper response to any given EDID can give the installer an edge in knowing that the source functions well against libraries of EDIDs. Quantum Data offers a free EDID library and with the 780A/B an installer can capture and store EDIDs from various displays to create a personal library. Even bad EDIDs can be useful to learn how well a source recovers from a bad EDID.
Quantum Data recently announced the availability of an optional automated EDID test for HDMI source devices and distribution devices. The test enables manufacturers of source devices and distribution gear to rapidly test their device’s response to a variety of EDIDs including HDMI 2.0 EDIDs.
The automated EDID test enables test engineers to specify the set of EDIDs used for testing. The test EDIDs can be commercial EDIDs, custom created EDIDs, even “test” EDIDs with known-anomalies. The automated EDID test is initiated through the front panel with the touch of a button or through the command line. Once initiated the test runs through all the EDIDs specified; no human intervention is required. Results are presented in a clear fashion indicating whether each EDID was handled properly—correct timing, VIC, color space, sampling mode received—based on the device’s output which is connected to the 780B HDMI Input port for analysis. The results can optionally be saved in a report for later viewing or dissemination to colleagues.
Quantum Data is well known in the industry for its EDID expertise. The 882 Video Test Instrument's EDID sink compliance test tool is approved for use in the HDMI, LLC Authorized Test Centers and is listed in the HDMI Compliance Test Specification. The 980 HDMI Protocol Analyzer offers an EDID compliance test utility for HDMI products and devices. Recently, Quantum Data launched an EDID Library offered to the industry free of charge.