Touch sensitive image display

A touch sensitive image display device for projecting a touch sensitive displayed image at an acute angle onto a display surface, the device comprising:

• a first non-visible light source to project a substantially two-dimensional first light distribution in a first plane;
• a second non-visible light source to project a substantially two-dimensional second light distribution in a second plane, wherein said second plane is different to said first plane;
• wherein said first and second planes are each above said display surface, and substantially parallel and non-intersecting;
• a multi-pixel sensor system to remotely detect touch of an area of said surface within or adjacent to said displayed image by detecting light from said first distribution, and having an output to provide a first object detection signal;
• said multi-pixel sensor system to remotely detect presence of an object at least partially within said second light distribution by detecting light from said second distribution, and having an output to provide a second object detection signal;
• and
• a controller having an input to receive said first object detection signal and an input to receive said second object detection signal and configured to control said touch sensitive image display device responsive to said signals, wherein
• said device is configured to multiplex projection of the first light distribution and projection of the second light distribution in said respective first and second planes.