Why Is Default Screen Color Blue

To be clear - I am not asking about a problem and I only ask this here because I have a MBP but the question is about all screens and since I could not find the answer through Google search and I have huge respect for the many minds here I hope you indulge me and my curiosity.
LCD screens tend to default to a blue color. My TV does this. My MBP gives a blue screen on start up, my PC has a blue screen mode as well. Why is this? An inherent physical characteristic of screens to default to blue, is it an agreed standard, or is it just custom on the part of engineers (although if so then why don't some brands default to another color such as green or red or yellow or gray just to differentiate their product from the competition?
So why do all my Macs use a blue screen at start up as do other electronic devices with screens that I use?

Thanks, and my monitor is CRT. However, this morning when I booted up, my screen is now back to normal, thank goodness. I emailed ZoomPanel which administers the surveys and they said someone would get back to me in 5 business days. Last night after I'd turned off, I thought about going back to the factory setting on my monitor but things were back to normal this morning. In the meantime, I'm staying away from those surveys!

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Message was edited by: Gernot Hoffmann

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