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Device and method for determining multi-touch positions of projected capacitive touch panel

A capacitive touch, multi-touch technology, used in electrical digital data processing, data processing input/output process, instruments, etc.

Active Publication Date: 2012-05-23
EGALAX EMPIA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for the conventional projected capacitive touch panel 10, the two touch points input by the user on the projected capacitive touch panel 10 are P1 (x1, y1) and P2 (x2, y2) or P3 (x1, y2). y2) and P4(x2, y1) cannot be judged

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  • Device and method for determining multi-touch positions of projected capacitive touch panel
  • Device and method for determining multi-touch positions of projected capacitive touch panel
  • Device and method for determining multi-touch positions of projected capacitive touch panel

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Embodiment Construction

[0038]The present invention is a device and method for determining the position of multiple touch points of a projected capacitive touch panel, which will be described in detail as follows with reference to preferred embodiments and accompanying drawings.

[0039] see image 3 , which is a three-dimensional exploded view of the projected capacitive touch panel of the present invention. like image 3 As shown, the projected capacitive touch panel 30 includes a transparent substrate 31, an X transparent sensing layer 32, a transparent dielectric layer 33, and a Y transparent sensing layer 34 that are formed in the same shape and stacked up sequentially. Same as the conventional one, there is a sensing pattern 37 on both the X transparent sensing layer 32 and the Y sensing film layer 34 , and the sensing pattern 37 is connected with an external wire 59 , which will be described below.

[0040] see Figure 4 , which is a functional block diagram of the device for determining th...

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Abstract

The invention discloses a device and a method for determining multi-touch positions of a projected capacitive touch panel, which are used to solve the problem that the projected capacitive touch panel in the publicly known art cannot determine multi-touch positions completely. The invention provides a device for definitely determining the multi-touch positions by using a search table, wherein thecontent of the search table contains the combinations of the comparison of x values of an X coordinate and the comparison of y values of a Y coordinate of each touch of the multiple touches. The method finds out the multi-touch positions by mapping with the search table. Compared with the prior art, the method avoids any increase in hardware cost and is an extremely convenient method.

Description

technical field [0001] The present invention relates to a device and method for judging the position of multiple touch points, in particular to a device and method for judging the position of multi-touch points of a projected capacitive touch panel. Background technique [0002] Currently, there are various touch technologies in the market, including resistive, capacitive, surface acoustic wave (SAW) and infrared (IR). Whether it is resistive, capacitive, surface acoustic wave or infrared touch technology, the multi-touch function can be realized. Looking further, capacitive touch can be divided into surface capacitive (Surface Capacitive) and projected capacitive (Projected Capacitive). The technology of surface capacitive touch is quite similar to that of resistive touch. Inexpensive, but not an ideal technology for multi-touch. To make the product achieve the multi-touch function, it is a better solution to choose the projected capacitive touch technology. [0003] Fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
Inventor 林昱翰
Owner EGALAX EMPIA TECH INC
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