Self capacitance screen oled modules

Into horizontal and vertical array of electrodes made of ITO (a transparent electrically conductive material) on a glass surface, these horizontal and vertical electrodes, respectively, to form a capacitance of this capacitor is commonly referred to the self-capacitance, which is the electrode capacitance to ground . When the fingers touch capacitive screen, finger capacitance will be superimposed on the screen condenser Screen capacitance increase.graphic lcd 128x64
When the touch is detected, since the capacitive screen sequentially detecting horizontal and vertical array of electrodes according to the touch before and after a change in capacitance, respectively, to determine the horizontal coordinates and vertical coordinates, and then combined into the plane of the touch coordinates. Scanning mode since the capacitance of the touch point on the touch screen is equivalent to the projection to the X-axis and Y-axis directions, and then calculate the coordinates in the X-axis and Y-axis directions, respectively, last combined into coordinates of the touch point.
If it is a single-point touch, are unique in the X-axis and Y-axis direction of the projection, the combination of the coordinates is also unique; if there are two points on the touch screen and touch these two points is not on the same X direction or the same Y direction, in the X and Y directions, respectively, the two projectors, the combination of the four coordinates. Obviously, only two coordinates is true, the other two is commonly known as "ghost". Therefore, since the capacitive screen can not achieve true multi-touch.20x2 lcd display