DVI Parrot Questions
What is EDID?
Extended Display Identification Data is information about a display’s supported resolutions, timings, formats, chromacity, and other media parameters that a display sends back to the connected graphics card. Without this information, the graphics card doesn’t know what video signals it can output, or even that a display is connected.
Why is the Parrot useful?
- It allows technicians to view EDID from display devices, as well as to create or tweak custom EDID profiles.
- It gives the graphics card the proper parameters to output video, even if the connected display device cannot.
- It keeps video software from crashing by preventing graphics ports from shutting down in the event that a display is disconnected.
How is the Parrot programmed?
Over USB with editing software called the Parrot Trainer, for PC/Mac
a. What do the toolbar buttons do?
i. Teach Parrot: Uploads the EDID profile in the editor to a Parrot
ii. Read Monitor: Downloads the EDID from a monitor connected to a Parrot
iii. Read Parrot: Downloads the EDID stored on a Parrot
iv. Spoof EDID: Tells a Parrot to emulate the EDID stored in its memory; toggles between spoof and pass-thru
v. Parrot menu: Shows all DVI Parrots locally connected via USB
vi. Squawk!: Makes the LED flash on the Parrot selected in the menu for easy identification
vii. Save: Saves the EDID profile currently in the editor to a computer drive
viii. Open: Loads an existing profile from a computer drive into the editor
ix. New: Creates a new EDID profile
b. What are the tabs?
One summary tab, plus tabs representing the 4 blocks of data in the current EDID specification. The data blocks are separated because each block supports newer, more complex settings for display devices. Provisions exist to support even more blocks of data in later revisions of EDID. Because these blocks are modular, two devices with different EDID revisions can communicate using only the blocks that both devices understand.
i. Summary: Overviews the parameters specified in the four data blocks of the EDID profile currently in the editor.
ii. Display: Identification, EDID version, video input definition, feature support, chromacity, image size, gamma value.
iii. Simple Timing: Established resolutions/refresh rates, standard timings with custom refresh rates.
iv. Detailed Timing:
1. Block 1: Timing sync/offsets, sync signal, stereo display.
2. Blocks 2-4: Additional display data.
v. Extension block: Underscan, audio, video compression, and additional timing support.
What are .edid files?
The EDID profiles saved from the editor to a computer drive.
- Why is the Parrot system unique? EDID profiles can be edited, archived, duplicated and distributed without the physical presence of any emulators or display devices.
- How are the files shared? EDID profiles can be shared in any manner available to other computer files—flash drives, network drives, email, IM, FTP, and more!
How is the Parrot used without the software?
- To enable/disable spoofing, momentarily press the Mode button to turn spoofing on or off. The indicator light will be green for “on” and blue for “off”.
- To read a display’s EDID directly into the Parrot, press and hold the Mode button for 5 seconds until the light stops flashing. If the flashing is green, the display is being read. If the flashing is red, the display cannot be read.
How does the Parrot program other emulators?
Other emulators may be limited to only emulating the EDID they can read from actual displays. Using the Parrot Trainer, the DVI Parrot can program any EDID information into these other emulators, without requiring any EDID profiles from potentially buggy displays.