Input device with projecting function

An input apparatus with a projecting function, wherein the input device has image data of a planar image for two-dimensional (2D) projection, and data about images of multiple visual angles corresponding to the multiple visual angles of an object for three-dimensional (3D) projection;

• and the input device comprises:
• a first input device, wherein the first input device generates a first input signal and comprises:
• a first processor, wherein the first processor performs operation on the image data of the planar image to generate first 2D projection data and second 2D projection data;
• and
• a first projection unit, configured to perform 2D projection according to the first 2D projection data, or perform 3D projection according to first 3D projection data;
• and
• a second input device, rotatably connected to the first input device, wherein the second input device generates a second input signal and comprises:
• a second processor, wherein the second processor performs operation on the data about the images of the multiple visual angles to generate the first 3D projection data and second 3D projection data;
• and
• a second projection unit, configured to perform the 2D projection according to the second 2D projection data, or perform the 3D projection according to the second 3D projection data, wherein when a projection direction of the first projection unit is the same as a projection direction of the second projection unit, the first projection unit and the second projection unit execute the 2D projection, and the planar image projected by the second projection unit is overlapped with the planar image projected by the first projection unit;
• and when a projection direction of the first projection unit is perpendicular to a projection unit of the second projection unit, the first projection unit and the second projection unit execute the 3D projection, and the first 3D projection data projected by the first projection unit and the second 3D projection data projected by the second projection unit form a 3D image of the object in the air.