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Researchers Submit Patent Application, "Touch Sensing Device and a Programmable Controller Thereof", for Approval

July 23, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Chuang, Kai-Chu (Zhushan, TW); Chou, Ta-Kang (Yongkang, TW), filed on December 27, 2012, was made available online on July 10, 2014.

No assignee for this patent application has been made.

News editors obtained the following quote from the background information supplied by the inventors: "This Application claims the benefit of the People's Republic of China Application No. 201110461261.X, filed on Dec. 30, 2011.

"The present disclosure relates to a touch sensing device. More particularly, the present disclosure relates to a programmable controller and a touch sensing device employing the same.

"With improvement of design technologies relating to semiconductor and electric circuits, touch sensing devices are gradually being applied in handheld devices and other electronic devices as human interfaces for receiving touch input signals produced by the touch sensing devices.

"With reference to FIG. 1A, FIG. 1A is a functional block diagram of a traditional touch sensing device. The touch sensing device 10 comprises a touch panel 101 and a controller 102, wherein the touch panel 101 is, for example, a projected capacitive touch panel, and comprises a plurality of driving lines D0.about.D27 and a plurality of sensing lines S0.about.S14. The driving lines D0.about.D27 and the sensing lines S0.about.S14 crosswise form a sensing electrode array, and junction of each of the driving lines D0.about.D27 and each of the sensing lines S0.about.S14 coupling-forms a capacitance (not shown). Moreover, the driving lines D0.about.D27 and the sensing lines S0.about.S14 are further respectively connected with driving pins D0'.about.D27' and sensing pins S0'.about.S14' of the controller 102 through wires. Accordingly, the controller 102 produces driving signals to the driving lines D0.about.D27 in sequence, and receives sensing signals of the sensing lines S0.about.S14 in sequence, so as to calculate capacitance change of each capacitance on the sensing electrode array based on the received sensing signals, thereby determining touch areas on the touch panel 101 by users.

"A design of the traditional touch sensing device 10 normally chooses an applicable controller 102 for collocation after obtaining required standards of the touch panel 101 such as size of panel, sensing resolution and the like. However, the controller 102 has a specific standard in design, namely, location and number of the driving pins D0'.about.D27' and sensing pins S0'.about.S14' of the controller 102 are fixed after design is accomplished, so that each kind of controllers is not easily applied in different standards of touch panel, and has more application restrictions. Accordingly, controller manufacturers normally reserve the sensing pins and/or the driving pins as much as possible in the design so as to be able to support different standards of touch panel. For example, the controller 102 designed as FIG. 1A can support a touch panel with maximum 16 sensing lines and 32 driving lines.

"The foregoing design of reserving more sensing pins and/or driving pins has a better applicability. However, as the location and number of sensing pins and driving pins of a controller are still fixed, the desired flexibility is reduced. With reference to FIG. 1B, FIG. 1B is a functional block diagram of another traditional touch sensing device that illustrates a practical situation that the controller cannot support a touch panel. A controller 112 of FIG. 1B has 16 sensing pins S0'.about.S15' and 32 driving pins D0'.about.D31', and a touch panel 111, on the other hand, has 18 sensing lines S0.about.S17 and 27 driving lines D0.about.D26. Accordingly, the controller 112 would face an inapplicable situation, wherein the sensing pins S0'.about.S15' cannot handle all of the sensing lines S0.about.S17 of the touch panel 111, and the driving pins D0'.about.D31' are more than all of the driving lines D0.about.D26 of the touch panel 111.

"Moreover, since location of the sensing pins and the driving pins of the traditional controller is fixed, circuit layout between the controller and the driving lines and sensing lines of the touch panel has a certain difficulty. With reference to FIG. 1C, FIG. 1C is a functional block diagram of another traditional touch sensing device. As shown in FIG. 1C, sensing lines S0.about.S7 and S8.about.S14 of a touch panel 121 are respectively located at upper right side and lower left side of the touch panel 121. In order to correspondingly connect to the sensing pins S0'.about.S7' and the sensing pins S8'.about.S14' of the controller 122 respectively, the wires which are used for connecting the sensing pins S0'.about.S14' and the sensing lines S0.about.S14 on the circuit board or flexible board form a cross-alignment layout. Therefore, the situation of cross-alignment can only be solved by increasing the layer number of circuit boards or flexible boards in design. However, the signals transmitted in the wires are analog signals with small amount of signals, so that those intercrossed wires are easily interfered with each other, and electrical performance of the whole touch sensing device is declined, more seriously, the case of error would occur."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "The present disclosure provides a touch sensing device and a programmable controller thereof, wherein the programmable controller is used for designing the touch sensing device and for setting corresponding relationship between a plurality of general pins of the programmable controller and a plurality of driving lines and a plurality of sensing lines of a touch panel. So that the programmable controller can flexibly set each general pin as driving pin or sensing pin to correspond to different standards of touch panel, and to effectively optimizing circuit layout between the touch panel and the programmable controller.

"The present disclosure provides a programmable controller, wherein the programmable controller comprises a plurality of general pins, a control circuit, and a plurality of switching units. The control circuit is used for recording corresponding relationship between the general pins and a plurality of sensing lines and a plurality of driving lines of a touch panel. The switching units are correspondingly connected with the general pins, and separately receive a switching signal produced by the control circuit, wherein the control circuit produces the switching signal based on the corresponding relationship. Each of the switching units selectively connects the correspondingly connected general pin to a sensing circuit or driving circuit based on the received switching signal.

"The present disclosure also provides a touch sensing device, wherein the touch sensing device comprises a touch panel and the foregoing programmable controller. The touch panel has a plurality of sensing lines and a plurality of driving lines.

"In an embodiment of the present disclosure, the control circuit further controls switching operation of the switching units through controlling producing sequence of the switching signal.

"In another embodiment of the present disclosure, when the control circuit controls each of the general pins, which is correspondingly connected with the driving lines, to selectively connect to the driving circuit for transmitting a driving signal produced by the driving circuit to the correspondingly connected driving lines, the control circuit also controls all of the general pins, which are correspondingly connected with the sensing lines, to selectively connect to the sensing circuit in sequence for transmitting a sensing signal coupling-produced by the correspondingly connected sensing line to the sensing circuit.

"In another embodiment of the present disclosure, the control circuit further simultaneously controls two switching units, which are correspondingly connected to the sensing lines, to selectively connect to two input terminals of the sensing circuit.

"In another embodiment of the present disclosure, each of the switching units further selectively connects the correspondingly connected general pin to a reference voltage terminal or a high impedance terminal based on the received switching signal.

"In another embodiment of the present disclosure, each of the switching units is designed with a combination of switches, a selector, or a multiplexer.

"In another embodiment of the present disclosure, the programmable controller is a single-chip system for integrating the control circuit, the switching units, the driving circuit, and the sensing circuit.

"In another embodiment of the present disclosure, the control circuit comprises a memory unit, an accessing control unit, and a signal producing unit. The accessing control unit connects to the memory unit for receiving the corresponding relationship, and then records the corresponding relationship into the memory unit. The signal producing unit is connected to the accessing control unit to obtain the corresponding relationship from the memory unit through the accessing control unit, and produces the switching signals based on the corresponding relationship.

"In conclusion, the programmable controller of the touch sensing device provided by the present disclosure can correspond to different standards of touch panel so as to increase application flexibility of the programmable controller, and can improve utilization of all of the general pins of the programmable controller. In addition, function of each general pin of the programmable controller such as driving or sensing, which can he set based on practical outlet location of the sensing lines and the driving lines of the touch panel and location of the general pins of the programmable controller, so as to eliminate obsession of circuit layout on the circuit board or flexible board and avoid the wires, which are used for connecting the touch panel and the programmable controller on the circuit board or the flexible board, forming cross-alignment.

"In order to further understand characteristics and technical aspects of the present disclosure, several descriptions accompanied with drawings are described in detail below. However, descriptions and accompanying drawings are for purposes of reference and specification only and not for limiting scope of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1A is a functional block diagram of a traditional touch sensing device;

"FIG. 1B is a functional block diagram of another traditional touch sensing device;

"FIG. 1C is a functional block diagram of another traditional touch sensing device;

"FIG. 2 is a functional block diagram of a touch sensing device in accordance with an embodiment of the present disclosure;

"FIG. 3A is a detailed circuit diagram of a touch sensing device in accordance with an embodiment of the present disclosure;

"FIG. 3B is a detailed circuit diagram of a touch sensing device in accordance with another embodiment of the present disclosure;

"FIG. 4 is a functional block diagram of a control circuit in accordance with an embodiment of the present disclosure;

"FIG. 5A is a diagram of corresponding relationship recorded by a memory unit in accordance with an embodiment of the present disclosure; and

"FIG. 5B is a diagram of corresponding relationship recorded by the memory unit in accordance with another embodiment of the present disclosure."

For additional information on this patent application, see: Chuang, Kai-Chu; Chou, Ta-Kang. Touch Sensing Device and a Programmable Controller Thereof. Filed December 27, 2012 and posted July 10, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=5609&p=113&f=G&l=50&d=PG01&S1=20140703.PD.&OS=PD/20140703&RS=PD/20140703

Keywords for this news article include: Patents, Electronics, Circuit Board.

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Source: Electronics Newsweekly


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