Method for detecting two sensing areas of photo-sensor touch panel and touch-sensitive electronic apparatus using the same

A touch-sensitive electronic apparatus comprising:

• a photo-sensor touch panel;
• and
• a control circuit configured for scanning the photo-sensor touch panel to obtain an image frame, defining a distribution area of data points in the image frame each having a brightness between a predetermined brightness and a first threshold brightness as a first sensing area, defining a distribution area of data points in the image frame each having a brightness between the predetermined brightness and a second threshold brightness as a second sensing area, and determining whether a real touch probably occurred according to a relative distance between one of a plurality of first data points and corresponding one of a plurality of second data points, wherein the first data points are located in the first sensing area and the second data points are located in the second sensing area,
• wherein when the relative distance is smaller than a predetermined distance, the control circuit determines that a real touch probably occurred,
• wherein when it is determined that a real touch probably occurred, the control circuit further detects the amount of the second data points having the relative distances smaller than the predetermined distance whether reaches a predetermined number, if the detect result is YES, the control circuit determines that a real touch really occurred, and
• wherein during the control circuit detecting the amount of the second data points having the relative distances smaller than the predetermined distance, the control circuit counts the amount of data points in the second sensing area located in a same row with an initial second data point which is firstly used to calculate the relative distance, along a predetermined direction whereby the initial second data point is taken as start point, and then determines the amount of the second data points having the relative distances smaller than the predetermined distance whether reaches the predetermined number according to the count result.