Ghost detecting method of capacitive touch control plate
A technology of capacitive touch and detection method, applied in the direction of electrical digital data processing, data processing input/output process, instruments, etc., can solve the problem that the control circuit cannot judge the contact position of the finger, cannot distinguish the correct position of each finger, Problems such as ghosting points
Inactive Publication Date: 2012-08-15
ELAN MICROELECTRONICS CORPORATION
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[0002] Among many touch technologies, Axis Intersect (AI) array projected capacitance (Projected Capacitance) sensing technology has become the most popular due to its high optical clarity, durability and low cost. Welcome technology, but its scanning method may produce ghost-points (Ghost-Point) when two or more fingers are used for multi-finger touch, so it is impossible to distinguish the correct position of each finger
[0003] figure 1 is a schematic diagram of the ghosting phenomenon, when the position of the user's two fingers on the capacitive touch panel is upper left and lower right (A, D) or lower left and upper right (C, B), the traces Y1, Y2 and traces Capacitance changes are caused on lines X1 and X2, so the capacitance change waveforms in the X direction and Y direction detected by the control circuit are the same, so the control circuit cannot judge the real finger contact position
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[0068] Figure 4 It is a schematic diagram of the first embodiment of the present invention, and the coordinates of the finger 12 are represented by x m the y k Indicates that the coordinates of the finger 14 are represented by x n the y l Indicates that finger 12 and finger 14 cause a capacitance change on the capacitive touchpad at position x m the y l 、x m the y k 、x n the y l and x n the y k Both peaks appear, resulting in ghosting, and the control circuit cannot tell whether the finger 12 is located at x m the y l still x m the y k , and it is impossible to judge whether finger 14 is located at x n the y l still x n the y k , at this time two sets of ghost candidate coordinates (x m the y l , x n the y k ) and (x m the y k , x n the y l ), position x m the y l 、x m the y k 、x n the y l and x n the y k Candidate locations for ghosts. The present invention proposes a ghost detection method. When a ghost phenomenon occurs, each position wher...
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The invention relates to a ghost detecting method of a capacitive touch control plate. A ghost phenomenon occurs in the first position and the second position of the capacitive touch control plate. The detecting method comprises steps that: an X-direction trace and a Y-direction trace in the first position and the second position are driven in a crossed way by synchronous signals of the same phase or different phases for obtaining capacitance values of the first position and the second position; and the better capacitance value is matched with crossed alignment for correctly distinguishing practical positions of fingers.
Description
technical field [0001] The invention relates to a capacitive touch panel, in particular to a ghost detection method of the capacitive touch panel. Background technique [0002] Among many touch technologies, Axis Intersect (AI) array projected capacitance (Projected Capacitance) sensing technology has become the most popular due to its high optical clarity, durability and low cost. It is a welcome technology, but its scanning method may produce ghost-points (Ghost-Point) when two or more fingers are used for multi-finger touch, so it is impossible to distinguish the correct position of each finger. [0003] figure 1 is a schematic diagram of the ghosting phenomenon, when the position of the user's two fingers on the capacitive touch panel is upper left and lower right (A, D) or lower left and upper right (C, B), the traces Y1, Y2 and traces Capacitance changes are caused on lines X1 and X2, so the X-direction capacitance change waveform and the Y-direction capacitance chan...
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IPC IPC(8): G06F3/044
Inventor 郭泊灏蔡欣学林旻致
Owner ELAN MICROELECTRONICS CORPORATION