Laptop Monitor Dimming and Aging

Hi,

I have an issue with my Toshiba M105-S3074 notebook:
While I'm on full power with the screen brightness set to its highest, it's fairly dim compared to most other models; not nearly to the point where I 'can't see it,' but definitely not like a new laptop. I've heard, but am not too certain -- lcd panels dim as they age. This case seems a bit significant, though. Are any of you familiar with this issue?
Also, the screen glitches a little bit when it runs on battery power. Whether the setting is Full Power, or other battery-saving modes, I see what appear to be a couple rectangles on the bottom half of the screen going black for a fraction of a second. Any ideas on what the cause might be?

Please help.

I didn't find the right solution from the Internet.

References:-
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Thanks