10. Technologies
EDID Management
Understanding the EDID
projectors). It contains information about the capabilities of the display, such as supported resolutions,
refresh rates (these are called Detailed Timings), the type and manufacturer of the display device, etc.
resolution and refresh rate of the image to be transmitted.
EDID Communication
Electronics Association). This extension contains information about additional Detailed Timings, audio
capabilities, speaker allocation and HDMI capabilities. It is important to know that all HDMI capable devices
must have CEA extension, but not all devices with CEA extension are HDMI capable.
Common Problems Related to EDID
Solution: If you want to see the image on both displays, you need to select the resolution of the smaller
display (in this case SXGA), otherwise the smaller display may not show the higher resolution
image.
Solution: Some graphics cards and video sources read out the EDID only after power-up and later they do
EDID again.
Advanced EDID Management
Source BIOS and operating systems are likely to query the sink using DDC2B protocol to determine what
connected sink’s EDID information. In the case of EDID readout failure or missing EDID, the source will not
built-in EDID Router can store and emulate factory pre-programmed- and User programmable EDIDs. The
EDID of the attached monitors or projectors for each output are stored in a non-volatile memory. This way
the EDID of a monitor is available when the monitor is unplugged or switched off.
Any EDID can be emulated on any input. An emulated EDID can be copied from the EDID router’s memory
(static EDID emulation), or from the last attached monitor’s memory (dynamic EDID emulation). For example,
this case, the EDID automatically changes, if the monitor is replaced with another display device (as long as
it has a valid EDID).
EDID is independently programmable for all inputs without affecting each other. All inputs have their own
EDID circuit.
INFO: The user is not required to disconnect the video cable to change an EDID as opposed to other
manufacturer’s products. EDID can be changed even if a source is connected to the input and powered
ON.
INFO:
do not sense this signal. In such cases, the source device must be restarted or powered OFF and ON
again.
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