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Most likely your LCD panels are going out and there is light leak even on 'black' for specific colors. Depends on what kind of projector and model, but I'd replace it. Sounds like it has surpassed its useful life.
Three LCD block in the Panasonic projector PT-L735 green,blue and red and two polarizer use with each LCD (as show in picture below) when polarizers faded due to age or any other reason then screen show the color. In your cause the green polarizers faded and need to be replaced
The tint you are seenig is most likely the lcd panels developing thermal damage due to the projector being improperly shut down. The projector should always be shut down using the remote or the power button on top of the projector. OR if this projector is ceiling mounted it could have blocked ventilation or if used in a smoky environment it could be smoke stained.
Most often color distortion is due to the bulb wearing out. Projector bulbs often fade or distort colors before they actually burn out. The other thing you can try is to reset the projector to it's factory settings, which sometimes fixes color issues. It's usually an option in the "settings" area of the menu.
If you're trying to project video, then the unit needs professional service. If you're trying to project from a computer, you may have a loose display cable, broken pins in one or both ends of the display cable, or broken conductors (wires) within the display cable. The computer sends its image information as a template of RED image components, GREEN image components and BLUE image components with the projector overlays to create the complete image with blended color values. (The computer also sends HORIZONTAL and VERTICAL synchronization signals, but those don'e affect the color content of the projected image.) That's why I'm suspicious of the display cable, conductors or pins.
I had a similar problem with my InFocus LP600 although my black stripe was straight up and down. I am guessing this is caused when the unit is bumped or dropped. This is not an easy fix unless you have a lot of experience with small tools and parts and you may need an extra set of hands. I found some tiny alignment screws under the lamp cover and hidden beneath a peel-off 0.5" x 2" black plastic strip. The screws are located between the bulb assembly and the main projection lens and are oriented 90 degrees apart around the light projection path. The trick is in getting the projector to temporarily function with the lamp cover off -- it has an interlock tab on one edge that pushes on a microswitch when closed. We turned the projector upside down but raised on some slats for heat dissipation, gently held the interlock switch in with a small screw driver, and plugged in the power cord. After pushing the power switch to get the image, I adjusted the tiny screw that is angled towards the front of the projector and the stripe dissapeared! Since your stripe is angled, you may need to adjust both alignment screws. The screw heads are very tiny torx bit types but I was able to use a 3/64" (.05") allen (hex) wrench that came in a set of cheap jewelers type tools that are widely available. Be very careful while operating the unit with the lamp cover off as there are very hot surfaces and exposed wiring.