If referring to a device that projects images:
* Receiver: This is the most direct opposite, as a receiver takes in information, while a projector sends it out.
* Screen: This is more about the surface receiving the image.
* Camera: This is a device that captures images, rather than projecting them.
If referring to a person who projects their thoughts or feelings:
* Introvert: This refers to a person who keeps their thoughts and feelings to themselves.
* Reserved: This refers to a person who is quiet and doesn't express themselves openly.
If referring to the act of planning and executing a project:
* Improvisor: This refers to someone who works without a plan and makes things up as they go along.
* Spontaneous: This refers to something that happens without planning.
To give you the best antonym, please provide the sentence or context where "projector" is used.