Positioning method for capacitance touch control plate of two dimension type configuration
A technology of capacitive touch and positioning method, applied in electrical digital data processing, input/output process of data processing, instruments, etc., can solve the problem that the detection circuit cannot correctly judge the position of the finger, and achieve the effect of low calculation amount
Inactive Publication Date: 2015-07-15
ELAN MICROELECTRONICS CORPORATION
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Problems solved by technology
This situation will cause the detection circuit to fail to correctly judge the position of the finger.
[0004] Therefore, there are above-mentioned inconveniences and problems in the known full-point and two-dimensional capacitive touch panels.
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[0052] The present invention will be further described below in conjunction with embodiment and accompanying drawing.
[0053] refer to figure 1 , when there is no finger touching the two-dimensional capacitive touch panel, the capacitance values of the sensing lines X1, X2 and X3 are respectively
[0054] C X1，no_finger =C X1，g +C X1，Y1 +C X1，Y2 +C X1，Y3 , Formula 1
[0055] C X2，no_finger =C X2，g +C X2，Y1 +C X2，Y2 +C X2，Y3 , Equation 2
[0056] C X3，no_finger =C X3，g +CX3，Y1 +C X3，Y2 +C X3，Y3 , Equation 3
[0057] Among them, C X1，g Indicates the coupling capacitance between the sensing line X1 and the ground terminal, C X1，Y1 、C X1，Y2 and C X1，Y3 Respectively represent the coupling capacitance between the sensing line X1 and the sensing lines Y1, Y2, Y3, and so on. If the in-phase signal activates the interleaved sensing lines X1 and Y1 at the same time and detects the sensing line X1, since the sensing lines X1 and Y1 have the same potential, ...
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The present invention relates to a positioning method for a capacitance touch control plate of two dimension type configuration, which is characterized by comprising the steps of (a) allowing a first sensing line and a second sensing line to be activated in phase under a first state, and obtaining a first capacitance value by detecting the first sensing line; (b) setting a benchmark value according to the first capacitance value; (c) allowing the first sensing line and the second sensing line to be activated in phase under a second state, and obtaining a second capacitance value by detecting the first sensing line; (d) allowing the first sensing line and a third sensing line to be activated in phase under the second state, and obtaining a third capacitance value by detecting the first sensing line; and (e) respectively comparing the second capacitance value and the third capacitance value with the benchmark value to determine the position of an object. Wherein no object touches the capacitance touch control plate under the first state, and an object touches the capacitance touch control plate under the second state.
Description
technical field [0001] The invention relates to a capacitive touch panel, in particular to a positioning method for a capacitive touch panel with a two-dimensional structure. Background technique [0002] The wiring and positioning methods of capacitive touch panels are divided into full-point and two-dimensional. The all-point capacitive touch panel arranges a plurality of independent single-point sensors in a matrix, and each sensor is connected to a detection circuit through an independent sensing line. This kind of touch panel can obtain accurate object position information, but due to the large number of sensors and sensing lines, the cost is high and the amount of data calculation is heavy. [0003] Two-dimensional capacitive touch panels are also called projected capacitive touch panels, such as figure 1 As shown, the sensor of this capacitive touch panel is composed of X-direction sensing lines and Y-direction sensing lines interlaced, and is matched with a two-dim...
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IPC IPC(8): G06F3/044
Inventor 林嘉兴陶逸欣粘紘宋柏安蔡欣学曾玄文
Owner ELAN MICROELECTRONICS CORPORATION