Resistive touch panel and method for detecting types of contact points
A technology of touch panel and detection method, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc.
Active Publication Date: 2011-07-13
ASUSTEK COMPUTER INC
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Problems solved by technology
At this time, the control circuit will calculate multiple contact points, but the contact points generated by pressing the palm and fingers are not effective contact points
Method used
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[0058] Please refer to Figure 7A , which is shown as a schematic diagram of using a finger to form a contact point. When using the finger 130 to press the touch panel, due to the large contact area, the contact area of the upper and lower strip-shaped ITO layers 112, 102 will be larger; similarly, the contact point generated by the palm (palm) will also make the The upper and lower strip-shaped ITO layers 112, 122 have relatively large contact areas. Furthermore, please refer to Figure 7B , which shows a schematic diagram of using the stylus 140 to form contact points. Since the area of the tip of the stylus is small, when the stylus is used to press the touch panel, the contact area of the upper and lower strip-shaped ITO layers will be small. And the present invention utilizes this feature to determine whether the contact point is a first type of contact point or a second type of contact point, wherein the first type of contact point is a small-area contact point,...
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The invention discloses a resistive touch panel and a method for detecting types of contact points. The panel comprises a plurality of detection areas, wherein a first detection area is defined by a first electrode, a second electrode, a third electrode and a fourth electrode; the first electrode and the second electrode belong to electrodes in the first direction; and the third electrode and thefourth electrode belong to electrodes in the second direction. The method comprises the following steps: when confirming that contact points are generated in the first detection area, connecting the first electrode to a voltage source and connecting the fourth electrode to an earth terminal to make the second electrode generate first voltage and the third electrode generate second voltage; when the difference of the first voltage and the second voltage is greater than a threshold, confirming that the contact points belong to first type contact points; and when the difference of the first voltage and the second voltage is smaller than the threshold, confirming that the contact points belong to second type contact points. The method can quickly judge the types of one or more contact points,and can further divide the contact points into effective contact points and ineffective non-effective contact points.
Description
technical field [0001] The present invention relates to a resistive touch panel and a detection method thereof, and in particular to a resistive touch panel and a detection method of a contact point type thereof. Background technique [0002] With the rapid development of computer technology, touch panels are also widely used in mobile phone screens, computer screens, and personal digital assistant (PDA) screens. Basically, a touch panel can be used as an input device of a computer to replace a mouse. Currently, resistive touch panels are most commonly used in touch panels. [0003] Please refer to Figure 1A , which is a side view of a known resistive touch panel. A plurality of strip-shaped indium tin oxide (Indium Tin Oxide, ITO for short) layers 102 are formed on the surface of a transparent glass substrate 100; moreover, a plurality of strip-shaped ITO are formed on the surface of a transparent film (film) 110 layer 112; wherein, the strip-shaped ITO layer 102 on the...
Claims
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IPC IPC(8): G06F3/045
Inventor 林洪义
Owner ASUSTEK COMPUTER INC