Device and method for displaying an image

摘要

A projector producing an imaginary input plane with high operability is provided. A projector according to an embodiment projects a VUI screen picture (22) onto a desk (20), and projects a main projection screen picture (32) to a wall (30). The projector (100) includes a light receiving element (170). The light receiving element (170) is arranged in a position where light emitted toward the desk (20) (VUI screen picture (22)) and reflected (or scattered) by an object (10) near the desk (20) enters. The projector (100) calculates a position of the object (10) based on light sensing timing by the light receiving element (170) and light scan positions at various points in time. The projector (100) changes a projected screen picture when it determines that object (10) is simultaneously in contact with a plurality of portions of the VUI screen picture (22) and at least one of contact positions moves.