Method and system for magnifying and displaying local image of touch display device by detecting approaching object

A system for magnifying and displaying a local image displayed on a touch display device, the touch display device comprising a display panel and a touch panel integrated on the display panel, the touch panel having a touch surface defining an effective touch zone, comprising:

• a microprocessor connected to the touch panel and the display panel via a touch panel interface and a display panel interface respectively;
• an approaching object altitude detection unit connected to the microprocessor and detecting an approaching altitude of an approaching object with respect to the touch surface of the touch panel to provide a detected altitude value to the microprocessor;
• a program memory connected to the microprocessor and storing a proximity magnification control program;
• and
• a proximity control parameter memory connected to the microprocessor and storing at least a first predefined approaching altitude and a corresponding magnification ratio, and a second predefined approaching altitude, wherein the second predefined approaching altitude is less than the first approaching altitude but greater than zero;
• configured such that when an approaching object is approaching the touch surface in the effective touch zone of the touch panel, the approaching object altitude detection unit detects when the detected value of the approaching altitude of the approaching object with respect to the touch surface of the touch panel is less than the first predefined approaching altitude and when the detected value of the approaching altitude of the approaching object with respect to the touch surface of the touch panel less then the second predefined approaching altitude, and the microprocessor executes the proximity magnification control program to magnify a target graphic representation displayed in a local area of the display panel corresponding to an approaching object position on the touch panel where the approaching object is heading for based on the magnification ratio corresponding to the first predefined approaching altitude with the approaching object position taken as a reference point when the detected value of the approaching altitude of the approaching object with respect to the touch surface of the touch panel is less than the first predefined approaching altitude;
• and the microprocessor determines when the target graphic representation associated with the approaching object position is an executable object and executes the executable object of the target graphic representation when the detected value of the approaching altitude of the approaching object with respect to the touch surface of the touch panel is less than the second predefined approaching altitude value and before the approaching object is in contact with the touch surface of the touch panel.