Method and device for detecting resistance type touch screen
A detection method and technology of a detection device are applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., which can solve the problems of large amount of calculation of detection accuracy, reduce the accuracy of touch point detection, etc., and achieve low hardware requirements. , the effect of less calculation and improved accuracy
Active Publication Date: 2015-05-13
APPOTECH
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However, since the resistance of the touch screen still has a certain degree of nonlinearity, using this method will inevitably cause errors due to the influence of the nonlinearity of the resistance, which reduces the detection accuracy of the touch point.
[0007] It can be seen that in the prior art, no matter when detecting a single touch point or two touch points on the touch screen, there are problems of detection accuracy and large amount of calculation.
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[0025] The resistive touch screen detection device of the present invention is a software program running on an electronic product with a resistive touch screen, and the detection method is to use the above detection device to realize the detection and coordinates of one touch point and two touch points on the touch screen. Calculation method.
[0026] see figure 2 , the resistive touch screen provided on the electronic device has two resistive layers, namely an X layer and a Y layer, wherein the X layer is used to detect the horizontal coordinate of the touch point, and the Y layer is used to detect the vertical coordinate of the touch point. The electronic device is also provided with a detection circuit 10 for detecting the number of touch points and the positions of the touch points on the touch screen. The detection circuit 10 has a constant current source 14 and a voltage source 15, and is provided with an analog-to-digital conversion circuit 11, a detection unit 12, a...
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The invention provides a method and a device for detecting a resistance type touch screen. The method comprises the following steps of loading voltage to two ends of an X layer of the touch screen; detecting a voltage value of a Y layer; loading voltage to two ends of the Y layer of the touch screen; detecting the voltage value of the X layer; establishing a first fitting formula which comprises more than two first unknown parameters by using the voltage value of the X layer and the voltage value of the Y layer; substituting the first fitting formula into a first calibration formula (img file=' DDA0000673689980000011. TIF' wi=' 920' he=' 104' / ) ( / maths) after selecting more than two calibration points to calculate the first unknown parameters; and calculating positions of a touch point on the X layer and the Y layer through the first fitting formula by using the first unknown parameters. M is the number of the calibration points, hk[Vy (i)] is the fitting formula, and Px (i) is transverse coordinates of an ith calibration point. The device is used for calculating the coordinates of the touch point of the touch screen by using the method. The computation burden is low, and the calculated position of the touch point is accurate.
Description
technical field [0001] The invention relates to the detection field of a touch screen, in particular to a detection method and a detection device for a touch point of a resistive touch screen. Background technique [0002] Most of the current consumer electronic devices are equipped with touch screens for displaying output information and receiving information input by users. At present, common touch screens are divided into resistive touch screens and capacitive touch screens. Capacitive touch screens have a good hand feeling and are easy to realize multi-touch, but the production cost is relatively high. Although the resistive touch screen does not feel good and it is difficult to realize multi-touch, it has strong competitiveness because of its low price, good sensitivity, strong stability and durability. [0003] Existing resistive touch screens have two resistive layers such as figure 1 As shown, one of the resistive layers is used to calculate the horizontal coordina...
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IPC IPC(8): G06F3/045
CPCG06F3/045
Inventor 陈文捷
Owner APPOTECH