Read the statement by Michael Teeuw here.
Screen's Brightness Pisses Me Off
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 Backlight is an issue with almost all LCD screens, this can be remedied by either a mirror with less light transmission (this will effectively dampen all light, even the parts you want to show.) or switch the monitor to a better one with a higher contrast, LED is usually better than CCFL when it comes to bleed through of the backlight. If you have a lot of money OLED is the shizzle, but it’s almost impossible to find in monitor sizes. 
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 @schlachtkreuzer6 tbs I got really a cheap one next door, I already have orderd a better one from ebay. hope it would make a difference. other than that the issue could be from the lcd I’m using 
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 @davidnesbitt7 I haven’t heared of MMM-remote-control before, looks really useful. thanks for the heads up, I definitely gonna try it out. 
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 @broberg I already have ordered a new mirror with 15% light transmission, not sure if that’s good enough. I’m also afraid that issue from the backlight, because the lcd’s backlight was broken and I manged to find someone to get it fixed for me. 
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 @Sean the background isn’t blue, it’s black. possibly that the angle of the photo I took makes look like blue. I already have tried to set the brightness and the contrast both to 50% still same thing. but it’s possible that the type of the mirror I’m using really sucks. that’s why I ordered another one 

