Alternative solution to the black screen when entering a password.

[ji4ozhu]

Alternative solution to the black screen when entering a password. When the screen is recognized as black, display the last screen with an image. How to do this?

[rom1v]

You can't know that the screen is "black" (unless you analyze the decoded image).

Moreover, sometimes, only some parts on the screen are "protected" (are captured black), not the whole screen.