Touch screen position detection method

A technology of touch screen detection and detection method, which is applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve the problems of smaller area, smaller signal, smaller coupling capacitance value, etc., so as to avoid the step effect and improve the recognizability , the effect of saving detection time

Active Publication Date: 2011-04-27
SHANGHAI TIANMA MICRO ELECTRONICS CO LTD
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Problems solved by technology

[0009] However, when the distance between the detection lines is too large, when the finger moves within the same detection line, the detection unit cannot recognize the movement of the finger because the obtained signals are the same, that is, a "step effect" occurs. The resolution of the touch screen is reduced; when the distance between the detection lines is reduced, the area corresponding to the finger and the detection line becomes smaller, resulting in a smaller value of the coupling capacitance generated by the finger, which reduces the signal on a single detection line. Increased the difficulty of identifying and comparing

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no. 1 example

[0054] refer to Figure 8 , the touch screen detection area 500 includes: the sensing lines 35a-35f in the horizontal direction and the driving lines 34a-34h in the vertical direction; the finger touch position is shown by the shadow in the figure, which covers three sensing lines in the horizontal direction, respectively 35c , 35d and 35e, covering three driving lines in the vertical direction, which are respectively 34a, 34b and 34c.

[0055] When using a specific embodiment of the present invention to detect the detection region 500, a certain number of driving lines can be used as a driving unit group for driving. refer to Figure 9 , firstly, add a driving voltage to each driving line in a driving unit group at the same time, and ground the driving lines of the remaining non-driving unit groups; for example, add a driving voltage V2 on the driving lines 34b-34d, and make The other drive lines are grounded. Then, the sensing lines 35a-35f are connected to the detection ...

no. 2 example

[0060] When using another specific embodiment of the present invention to detect the detection area 500, refer to Figure 11 Firstly, the driving voltage V3 is simultaneously applied to the driving lines 34a-34h; then, the sensing lines 35a-35f are connected to the detection unit 501 in sequence. By comparing the magnitudes of the obtained detection signals, the position touched by the finger can be determined. Since the driving voltage is applied to all the driving lines at the same time, the coupling capacitance between the driving lines and the sensing lines is increased, so the detection signal obtained through each sensing line is also increased. At this time, even if the distance between each detection line is reduced, the detection signal is still highly identifiable, so the detection signal can be increased without reducing or even increasing the resolution of the touch screen.

[0061] In addition, the above-mentioned driving lines and sensing lines can be exchanged,...

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Abstract

The invention discloses a touch screen position detection method. The method comprises the following steps of: applying a plurality of first driving signals to a first detection end of a touch screen detection region, detecting signals at a second detection end of the touch screen detection region and acquiring a first coordinate value according to a detection result of the second detection end; applying a plurality of second driving signals to the second detection end, detecting the signals of the first detection end and determining a second coordinate value according to a detection result of the first detection end; and determining a touch position by using the first coordinate value and the second coordinate value. In the method, a driving end and an inducing end are used as the driving ends respectively, and a plurality of detection lines are simultaneously used for driving each time, so the identifiability of a detection signal is improved, the step effect is avoided and the detection time is saved on the premise of not affecting resolution.

Description

technical field [0001] The invention relates to capacitive touch screen technology, especially a position detection method. Background technique [0002] Simply speaking, touch screen technology is to directly touch the screen to input information and obtain output information, without the need for a mechanical mouse or buttons. Because of its simple and novel application, in recent years, touch screen technology has been more and more applied to various electronic products, such as mobile phones, notebook computers, MP3 / MP4 and so on. Commonly used touch screen technologies generally include four types: resistive, capacitive, infrared, and surface acoustic wave. Among them, compared with the traditional resistive touch screen technology, the capacitive touch screen technology can detect multiple touch points, and compared with the infrared touch screen technology, it has the advantages of lower cost, good linearity and operability. , thus becoming the current mainstream m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041G06F3/044
Inventor 陈悦王丽花邱承彬
Owner SHANGHAI TIANMA MICRO ELECTRONICS CO LTD
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