Patent ID: 8860696

Claim:
An integrated touch-sensing display apparatus, comprising: an array of picture elements that defines a display area; an array of light-sensing elements integrated within the display area; a light guide located in front of the display area to define a touch surface, the light guide being configured to allow light to propagate inside the light guide by total internal reflection; a light source arrangement for providing illuminating light inside the light guide, such that an object contacting the touch surface causes frustration of the total internal reflection of the illuminating light and thereby a part of the illuminating light to be scattered towards the display area; and a processing element configured to obtain image data representing the scattered illuminating light impinging on the display area based on output signals from the light-sensing elements and independent of signal patterns resulting from ambient light, the processing element being further configured to determine the location of the object on the touch surface based on the image data; wherein at least a subset of the light-sensing elements are provided with respective lens devices, each lens device being configured to reduce a field of view of a corresponding light-sensing element, each lens device is configured to focus scattered illumination light from a portion of the touch surface onto the corresponding light-sensing element, and each lens device is configured such that light scattered by the object contacting the touch surface is projected onto a smaller area than light scattered by an object hovering above the touch surface.