Device and method for detecting touch screen
First Claim
1. A method for operating a touch screen, wherein said touch screen comprising a plurality of first conductive strips arranged parallel in a first direction and a plurality of second conductive strips arranged parallel in a second direction, and at least one external grounded conductive object on said touch screen is detected based on a reference value, said method comprising:
- (a) performing a one-dimensional (1D) mutual capacitive detection to obtain a first 1D sensing information within a predetermined period of time, wherein said 1D mutual capacitive detection including;
simultaneously providing a driving signal to all of the first conductive strips;
detecting mutual capacitive signals of all of the second conductive strips to generate the first 1D sensing information; and
determining whether at least one external grounded conductive object is touching or approaching the touch screen based on the first 1D sensing information within said predetermined period of time;
(b) performing a two-dimensional (2D) mutual capacitive detection to obtain a 2D sensing information, said 2D mutual capacitive detection including;
sequentially providing a driving signal to one or more different conductive strips in the first conductive strips;
each time one or more different conductive strips in the first conductive strips being provided with the driving signal, detecting the signals of all of the second conductive strips to obtain a 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal generated based on the mutual capacitive signals of all of the second conductive strips; and
combining each 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal to generate a 2D sensing information;
(c) determining a location of the said at least one external grounded conductive object based on said 2D sensing information when said first 1D sensing information indicates that there is the at least one external grounded touching or approaching said touch screen;
(d) updating said reference values based on said 2D sensing information when said first 1D sensing information indicates that there is no at least one external grounded conductive object touching or approaching said touch screen.
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Accused Products
Abstract
The invention discloses a full screen driven detection. A driving signal is simultaneously provided to all first conductive strips arranged in parallel in a first direction in a touch screen, and mutual capacitive signals are detected from all second conductive strips arranged in parallel in a second direction. The mutual capacitive signals can be used for determining whether an external conductive object coupled to the ground is touching or approaching the touch screen or not even if water or other conductive object not coupled to ground is on the touch screen. Thus, the baseline of the mutual capacitive signals can be updated if the touch screen is not touched or approached by any external conductive object coupled to ground over a predetermined period of time.
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Citations
20 Claims
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1. A method for operating a touch screen, wherein said touch screen comprising a plurality of first conductive strips arranged parallel in a first direction and a plurality of second conductive strips arranged parallel in a second direction, and at least one external grounded conductive object on said touch screen is detected based on a reference value, said method comprising:
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(a) performing a one-dimensional (1D) mutual capacitive detection to obtain a first 1D sensing information within a predetermined period of time, wherein said 1D mutual capacitive detection including; simultaneously providing a driving signal to all of the first conductive strips; detecting mutual capacitive signals of all of the second conductive strips to generate the first 1D sensing information; and determining whether at least one external grounded conductive object is touching or approaching the touch screen based on the first 1D sensing information within said predetermined period of time; (b) performing a two-dimensional (2D) mutual capacitive detection to obtain a 2D sensing information, said 2D mutual capacitive detection including; sequentially providing a driving signal to one or more different conductive strips in the first conductive strips; each time one or more different conductive strips in the first conductive strips being provided with the driving signal, detecting the signals of all of the second conductive strips to obtain a 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal generated based on the mutual capacitive signals of all of the second conductive strips; and combining each 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal to generate a 2D sensing information; (c) determining a location of the said at least one external grounded conductive object based on said 2D sensing information when said first 1D sensing information indicates that there is the at least one external grounded touching or approaching said touch screen; (d) updating said reference values based on said 2D sensing information when said first 1D sensing information indicates that there is no at least one external grounded conductive object touching or approaching said touch screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for detecting a touch screen in accordance with the present invention includes:
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the touch screen including a plurality of first conductive strips arranged parallel in a first direction and a plurality of second conductive strips arranged parallel in a second direction; and a controller for detecting the touch screen, including; (a) performing a one-dimensional (1D) mutual capacitive detection to obtain a first 1D sensing information within a predetermined period of time, said 1D mutual capacitive detection including; simultaneously providing a driving signal to all of the first conductive strips; detecting mutual capacitive signals of all of the second conductive strips to generate the first 1D sensing information; and determining whether at least one external grounded conductive object is touching or approaching the touch screen based on the first 1D sensing information within said predetermined period of time; (b) performing a-two-dimensional (2D) mutual capacitive detection to obtain a 2D sensing information said 2D mutual capacitive detection including; sequentially providing a driving signal to one or more different conductive strips in the first conductive strips; each time one or more different conductive strips in the first conductive strips being provided with the driving signal, detecting the signals of all of the second conductive strips to obtain a 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal generated based on the mutual capacitive signals of all of the second conductive strips; and combining each 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal to generate a 2D sensing information; (c) determining a location of the said at least one grounded conductive object based on said 2D sensing information when said first 1D sensing information indicates that there is the at least one grounded conductive object touching or approaching said touch screen; (d) updating said reference values based on said 2D sensing information when said first 1D sensing information indicates that there is no at least one grounded conductive object touching or approaching said touch screen. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for operating a touch screen, wherein said touch screen comprising a plurality of first conductive strips arranged parallel in a first direction and a plurality of second conductive strips arranged parallel in a second direction, and at least one external grounded conductive object on said touch screen is detected based on a reference value, said method comprising:
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performing a one-dimensional (1D) mutual capacitive detection to obtain a first 1D sensing information within a predetermined period of time, and said 1D mutual capacitive detection including; simultaneously providing a driving signal to all of the first conductive strips; detecting mutual capacitive signals of all of the second conductive strips to generate the first 1D sensing information; and determining whether at least one external grounded conductive object is touching or approaching the touch screen based on the first 1D sensing information within said predetermined period of time; and updating said reference values based on said 2D sensing information when said first 1D sensing information indicates that there is no at least one external grounded conductive object touching or approaching said touch screen, wherein said 2D sensing information is obtained by performing a two-dimensional (2D) mutual capacitive detection, said 2D mutual capacitive detection including; sequentially providing a driving signal to one or more different conductive strips in the first conductive strips; each time one or more different conductive strips in the first conductive strips being provided with the driving signal, detecting the signals of all of the second conductive strips to obtain a 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal generated based on the mutual capacitive signals of all of the second conductive strips; and combining each 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal to generate a 2D sensing information. - View Dependent Claims (18)
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19. A device for detecting a touch screen in accordance with the present invention includes:
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the touch screen including a plurality of first conductive strips arranged parallel in a first direction and a plurality of second conductive strips arranged parallel in a second direction; and a controller for detecting the touch screen, including; performing a one-dimensional (1D) mutual capacitive detection to obtain a first 1D sensing information within a predetermined period of time, and said 1D mutual capacitive detection including; simultaneously providing a driving signal to all of the first conductive strips; detecting mutual capacitive signals of all of the second conductive strips to generate the first 1D sensing information; and determining whether at least one external grounded conductive object is touching or approaching the touch screen based on the first 1D sensing information within said predetermined period of time; and updating said reference values based on said 2D sensing information when said first 1D sensing information indicates that there is no at least one external grounded conductive object touching or approaching said touch screen, wherein said 2D sensing information is obtained by performing a two-dimensional (2D) mutual capacitive detection, said 2D mutual capacitive detection including; sequentially providing a driving signal to one or more different conductive strips in the first conductive strips; each time one or more different conductive strips in the first conductive strips being provided with the driving signal, detecting the signals of all of the second conductive strips to obtain a 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal generated based on the mutual capacitive signals of all of the second conductive strips; and combining each 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal to generate a 2D sensing information. - View Dependent Claims (20)
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Specification