I wouldn't say shit to your boss. Most job resources I know of say to avoid blabbing to your co-workers and boss about changing jobs. WHY? Because they can sabotage your plans to land a different job. I have made the mistake of telling my co-workers about my plans to move on from a shitty job and they really do try to stab you in the back due to jealousy and whatnot. "How DARE that person try to better themselves..."
Why are you sticking with the same company just a different department? I tried to switch departments and/or move up the ladder when I worked at Walmart and the store manager just ignored my request. He was a total dick of a boss. Problem is, now I have to explain to my future hiring manager why I quit/got fired from there without ripping into my bosses... During interviews, we are supposed to accentuate the positives of our previous job(s).
Keep your head up.

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