|It sounds like the backlight is going out. If it's an older model, it uses a cold cathode florescent tube, they can start to dim at one end when they go bad. If it's a newer model, they use an array of white LED's for the backlight and possibly one of those has gone bad.|
Edit, cold cathode tubes that are at the end of their life can also put out a pinkish hue when they first come on, are you seeing this issue when you first turn on your laptop?
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