| 摘要 |
A display apparatus includes a display having a pixelated display surface and an opposed surface, and a substantially planar light guide structure having a light emitting surface that is optically coupled to the opposed surface of the display. The light emitting surface of the light guide structure has an array of gratings arranged as a plurality of sub-arrays of gratings. At least some of the gratings of a given sub-array are configured to emit display light towards the opposed surface of said display, and at least one of the gratings of the given sub-array is configured to emit non-display light (e.g., IR light) towards the opposed surface of the display and to receive non-display light that is at least one of reflected from and scattered by an object that is proximate to the pixelated display surface. The display apparatus also comprises a plurality of light sensors that are disposed along at least two edges of the light guide structure and that are configured to detect the received non-display light. The plurality of light sensors have outputs configured to be connected to a data processor that operates in accordance with a stored program to determine a location of the object on the pixelated display surface.
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