If you find that a projector infringes your intellectual property rights, for example, you have related patents or trademarks, you can consider suing the projector manufacturer or seller who infringes your rights and interests. To this end, you need to seek professional legal aid to ensure that your proceedings comply with local laws and regulations and get a fair trial.

Before litigation, you can also try to negotiate with the infringer and reach a solution through negotiation. This may involve repricing, paying some compensation or reaching a license agreement to solve your intellectual property problems. You can also consider contacting relevant government agencies or professional institutions for help and advice.

In a word, you need to take appropriate legal measures to protect your intellectual property rights and business interests.