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What is the reason for using CRT used instead of LCD or LED displays?

What is the reason for using CRT used instead of LCD or LED displays? Correct Answer To meet the required brightness level

To clearly see the flight parameters displayed on the combiner glass against the bright sky, it is necessary to achieve a display brightness of 30,000 Cd/m2. This high brightness requirement is the reason why CRT is used instead of LCD or LED, even though CRT’s are heavier and require more power to run.

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