Touch positioning method for touch panel

Abstract

An object positioning method for touch panel is disclosed. The method includes steps as follows: obtaining a motion estimation vector according to the operational analysis of a positioning coordinate and a sensing coordinate, and determining whether the length of the motion estimation vector is smaller than a predetermined distance or not, if the length of the motion estimation vector is smaller than the predetermined distance, outputting the positioning coordinate; on the contrary, if the length of the motion estimation vector is larger than the predetermined distance, updating the value of the positioning coordinate and outputting the positioning coordinate updated.

What is claimed is: 
     
         1 . An object positioning method, used for a touch panel, the object positioning method comprising:
 recording a positioning coordinate of an object;   acquiring a sensing coordinate of the object according to calculation of a sensing signal;   acquiring a motion estimation vector according to calculation of the positioning coordinate and the sensing coordinate;   determining whether length of the motion estimation vector is smaller than a predetermined distance;   calculating an object movement vector of the object according to the predetermined distance and the motion estimation vector, if length of the motion estimation vector is larger than predetermined distance; and   updating the positioning coordinate to a position of sum of the positioning coordinate and the object movement vector,   wherein direction vector of the object movement vector is unit vector of the motion estimation vector, and magnitude of the object movement vector is that the predetermined distance subtracted by the length of the motion estimation vector.   
     
     
         2 . The object positioning method according to  claim 1 , further comprising:
 entering into a point-locked mode, if length of the motion estimation vector is smaller than the predetermined distance.   
     
     
         3 . The object positioning method according to  claim 1 , wherein step of entering into the point-locked mode, further comprising:
 outputting the positioning coordinate and returning to step of acquiring the sensing coordinate of the object according to calculation of the sensing signal.   
     
     
         4 . The object positioning method according to  claim 1 , wherein before step of recording the positioning coordinate of the object, further comprising:
 detecting and confirming that the object touches the touch panel, wherein the touch panel is a capacitive touch panel.   
     
     
         5 . The object positioning method according to  claim 4 , wherein the amount of change of capacitance of the capacitive touch panel is transformed to the sensing signal by a control circuit. 
     
     
         6 . The object positioning method according to  claim 3 , wherein after step of the length of the motion estimation vector being smaller than the predetermined distance, further comprising:
 locking the positioning coordinate of the object.   
     
     
         7 . The object positioning method according to  claim 1 , wherein the object is a stylus. 
     
     
         8 . The object positioning method according to  claim 5 , wherein the control circuit has a plurality of control commands and the control commands are written into a firmware to the control circuit and the control circuit proceeds calculation, judgment and control according to the control commands. 
     
     
         9 . The object positioning method according to  claim 5 , wherein the control circuit is a digital signal processor (DSP). 
     
     
         10 . The object positioning method according to  claim 5 , wherein the control circuit calculates the object movement vector according to the predetermined distance, the positioning coordinate and the sensing coordinate. 
     
     
         11 . An object trajectory adjusting method, used for a touch panel, comprising:
 detecting positions of an object moving on a touch panel;   recording a current coordinate of the object;   acquiring a motion estimation vector of the object;   determining a next coordinate of the object by adding an object movement vector to the current coordinate if the length of the motion estimation vector is larger than a predetermined distance, wherein the magnitude of the object movement vector is the difference between the predetermined distance and the length of the motion estimation vector.   
     
     
         12 . The object trajectory adjusting method according to  claim 11 , wherein the motion estimation vector is calculated from the current coordinate to a sensing coordinate. 
     
     
         13 . The object trajectory adjusting method according to  claim 11 , wherein the direction vector of the object movement vector is unit vector of the motion estimation vector. 
     
     
         14 . The object trajectory adjusting method according to  claim 11 , wherein the next coordinate equals to the current coordinate if the length of the motion estimation vector is not larger than the predetermined distance.