Method and apparatus for automatically correcting image misalignment arising in a rear-projection LCD television display

A method for adjusting a relative position of an image on a screen of a display device, said method comprising the steps of:

• projecting a test image from a projector onto the screen;
• detecting a portion of the test image on the screen;
• generating, in response to the detected portion of the lest image, an alignment signal representative of an amount of misalignment of the test image on the display screen;
• and
• adjusting a relative position of the projector in response to said alignment signal so that the test image is properly aligned on the screen,
• wherein the relative position of projector is adjusted by rotation of the projector.

A rear-projection television, comprising:

• a projector operable to receive a signal representative of an image and to generate light representative of the image;
• a lens assembly for receiving from the projector the generated light representative of the image and projecting said generated light;
• at least one mirror receiving the generated light from the lens assembly and reflecting it to the display screen;
• a display screen onto which the generated light is projected so that the image is visible to a viewer,
• an image alignment arrangement for adjusting a relative position of the image on the display screen, said image alignment arrangement being operable to project a test image from the projector onto the display screen and including:
• at least one sensor located on the display screen for detecting the test image and generating an alignment signal representative of an amount of misalignment of the test image on the display screen;
• and
• a mechanical actuator for adjusting, in response to said alignment signal, a relative position of at least one component selected from the group consisting of the projector, the lens assembly, and said at least one mirror so that the test image is properly aligned on the display screen.