Touch sensor, display and electronic device using a timing control signal
First Claim
1. A touch sensor apparatus, comprising:
- a first signal source generating a first drive signal;
a first drive electrode receiving the first drive signal as a display drive signal doubling as a touch sensor drive signal from the first signal source;
a first detection electrode located adjacent to the first drive electrode;
a dielectric material located between the first drive electrode and the first detection electrode defining a first capacitive area, wherein the first detection electrode generates a first output signal driven by the first drive signal;
a detection circuit electrically connected to the first detection electrode, the detection circuit sensing the first output signal, the detection circuit including;
a detection signal line connected to the first detection electrode;
an amplification section that amplifies the first output signal;
a switch element that is arranged between the detection signal line and a ground and that is arranged between the amplification section and the ground, and the switch element having a first state and a second state; and
a control unit controls the switch element to turn on in synchronization with a timing immediately before a polarity-reversing timing of the first drive signal;
a plurality of pixel electrodes formed on a first substrate;
a second substrate opposing the first substrate; and
a liquid crystal layer arranged between the first substrate and the second substrate,wherein the first detection electrode is formed between the second substrate and a polarizing plate,wherein according to a timing control signal which is in synchronization with the timing immediately before the polarity-reversing timing of the first drive signal, and the timing immediately before the first drive signal is supplied to the first drive electrode or synchronized with the timing immediately before the first drive signal is stopped, indicating a timing to alternatively switch between turned on and turned off, the switch element forces the first detection electrode to a ground voltage when the switch element is turned on, the switch element allows the first detection electrode to float when the switch element is turned off, andwherein the detection circuit determines a first detection result by comparing the first output signal to a signal threshold, the first detection result indicative of whether the first capacitive area was in a touch state.
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Accused Products
Abstract
A capacitive type touch sensor appropriately detecting an object, and a display and an electronic device including such a touch sensor are provided. The display including a drive electrode receiving a drive signal, a detection electrode located adjacent to the drive electrode, and a dielectric material located between the drive electrode and the detection electrode defining a capacitive area. The detection electrode generates an output signal driven by the drive signal, a detection circuit electrically connected to the detection electrode sensing the output signal. A switch element is electrically connected between the detection electrode and a voltage source providing a predefined voltage level and having a first state and a second state. A display control circuit controls a voltage applied between a display common voltage electrode and a pixel electrode to display an image based on an image signal, and the display common voltage electrode serves as the drive electrode.
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Citations
30 Claims
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1. A touch sensor apparatus, comprising:
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a first signal source generating a first drive signal; a first drive electrode receiving the first drive signal as a display drive signal doubling as a touch sensor drive signal from the first signal source; a first detection electrode located adjacent to the first drive electrode; a dielectric material located between the first drive electrode and the first detection electrode defining a first capacitive area, wherein the first detection electrode generates a first output signal driven by the first drive signal; a detection circuit electrically connected to the first detection electrode, the detection circuit sensing the first output signal, the detection circuit including; a detection signal line connected to the first detection electrode; an amplification section that amplifies the first output signal; a switch element that is arranged between the detection signal line and a ground and that is arranged between the amplification section and the ground, and the switch element having a first state and a second state; and a control unit controls the switch element to turn on in synchronization with a timing immediately before a polarity-reversing timing of the first drive signal; a plurality of pixel electrodes formed on a first substrate; a second substrate opposing the first substrate; and a liquid crystal layer arranged between the first substrate and the second substrate, wherein the first detection electrode is formed between the second substrate and a polarizing plate, wherein according to a timing control signal which is in synchronization with the timing immediately before the polarity-reversing timing of the first drive signal, and the timing immediately before the first drive signal is supplied to the first drive electrode or synchronized with the timing immediately before the first drive signal is stopped, indicating a timing to alternatively switch between turned on and turned off, the switch element forces the first detection electrode to a ground voltage when the switch element is turned on, the switch element allows the first detection electrode to float when the switch element is turned off, and wherein the detection circuit determines a first detection result by comparing the first output signal to a signal threshold, the first detection result indicative of whether the first capacitive area was in a touch state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 30)
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12. A display apparatus, comprising:
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a drive electrode receiving a drive signal as a display drive signal doubling as a touch sensor drive signal; a detection electrode located adjacent to the drive electrode; a dielectric material located between the drive electrode and the detection electrode defining a capacitive area, wherein the detection electrode generates an output signal driven by the drive signal; a plurality of pixel electrodes formed on a first substrate; a second substrate opposing the first substrate; and a liquid crystal layer arranged between the first substrate and the second substrate, wherein the detection electrode is formed between the second substrate and a polarizing plate; a detection circuit electrically connected to the detection electrode, the detection circuit sensing the output signal; and a display control circuit controlling a voltage applied between a display common voltage electrode and a pixel electrode so as to display an image based on an image signal, and wherein the detection circuit includes; a detection signal line connected to the detection electrode; an amplification section that amplifies the first output signal; and a switch element that is arranged between the detection signal line and a ground and that is arranged between the amplification section and the ground, and the switch element having a first state and a second state; and a control unit controls the switch element to turn on in synchronization with a timing immediately before a polarity-reversing timing of the first drive signal, wherein according to a timing control signal which is in synchronization with the timing immediately before the polarity-reversing timing of the drive signal, and the timing immediately before the drive signal is supplied to the drive electrode or synchronized with the timing immediately before the drive signal is stopped, indicating a timing to alternatively switch between turned on and turned off, the switch element forces the detection electrode to a ground voltage when the switch element is turned on, the switch element allows the detection electrode to float when the switch element is turned off, wherein the display common voltage electrode serves as the drive electrode. - View Dependent Claims (13, 14, 15)
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16. An electronic device, comprising:
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a plurality of pixel electrodes formed on a first substrate; a second substrate opposing the first substrate; a liquid crystal layer arranged between the first substrate and the second substrate; a drive electrode receiving a first drive signal as a display drive signal doubling as a touch sensor drive signal; a detection electrode formed between the second substrate and a polarizing plate; a capacitive type touch sensor including a capacitive area producing an output signal; and a detection circuit sensing the output signal from a detection electrode, the detection circuit including; a detection signal line connected to the detection electrode; an amplification section that amplifies the first output signal; and a switch element that is arranged between the detection signal line and a ground and that is arranged between the amplification section and the ground, and the switch element having a first state and a second state; and a control unit controls the switch element to turn on in synchronization with a timing immediately before a polarity-reversing timing of the first drive signal, wherein the switch element receives a timing control signal which is in synchronization with the timing immediately before the polarity-reversing timing of a drive signal, and the timing immediately before the drive signal is supplied to the drive electrode or synchronized with the timing immediately before the drive signal is stopped, allowing the switch element to alternatively switch between turned on and turned off, the switch element forces the detection electrode to a ground voltage when the switch element is turned on, the switch element allows the detection electrode to float when the switch element is turned off, and wherein the detection circuit determines a detection result by comparing the output signal to a signal threshold, the detection result indicating whether the capacitive area was in a touch state. - View Dependent Claims (17, 18, 19)
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20. A touch sensor apparatus, comprising:
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a plurality of pixel electrodes formed on a first substrate; a second substrate opposing the first substrate; a liquid crystal layer arranged between the first substrate and the second substrate; a drive electrode receiving a first drive signal as a display drive signal doubling as a touch sensor drive signal; a detection electrode formed between the second substrate and a polarizing plate; a capacitive area producing an output signal; and a detection circuit sensing the output signal from a detection electrode, the detection circuit including; a detection signal line connected to the detection electrode; an amplification section that amplifies the first output signal; and a switch element that is arranged between the detection signal line and a ground and that is arranged between the amplification section and the ground, and the switch element having a first state and a second state; and a control unit controls the switch element to turn on in synchronization with a timing immediately before a polarity-reversing timing of the first drive signal, wherein according to a timing control signal which is in synchronization with the timing immediately before the polarity-reversing timing of a drive signal, and the timing immediately before the drive signal is supplied to the drive electrode or synchronized with the timing immediately before the drive signal is stopped, indicating a timing to alternatively switch between turned on and turned off, the switch element forces the detection electrode to a ground voltage when the switch element is turned on, the switch element allows the detection electrode to float when the switch element is turned off, and wherein the detection circuit determines a detection result indicative of whether the capacitive area was in a touch state. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A touch sensor apparatus, comprising:
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a first signal source generating a first drive signal; a first drive electrode receiving the first drive signal as a display drive signal doubling as a touch sensor drive signal from the first signal source; a first detection electrode located adjacent to the first drive electrode; a plurality of pixel electrodes formed on a first substrate; a second substrate opposing the first substrate; a liquid crystal layer arranged between the first substrate and the second substrate, wherein the first detection electrode is formed between the second substrate and a polarizing plate, a dielectric material located between the first drive electrode and the first detection electrode defining a first capacitive area, wherein the first detection electrode generates a first output signal driven by the first drive signal; and a detection circuit electrically connected to the first detection electrode, the detection circuit sensing the first output signal, and the detection circuit including; a detection signal line connected to the first detection electrode; an amplification section that amplifies the first output signal; and a switch element that is arranged between the detection signal line and a ground and that is arranged between the amplification section and the ground, and the switch element having a first state and a second state; and a control unit controls the switch element to turn on in synchronization with a timing immediately before a polarity-reversing timing of the first drive signal, wherein according to a timing control signal which is in synchronization with the timing immediately before the polarity-reversing timing of the first drive signal, and the timing immediately before the first drive signal is supplied to the first drive electrode or synchronized with the timing immediately before the first drive signal is stopped, indicating a timing to alternatively switch between turned on and turned off, the switch element forces the first detection electrode to a ground voltage when the switch element is turned on, the switch element allows the first detection electrode to float when the switch element is turned off, and wherein the detection circuit determines a first detection result by comparing the first output signal to a signal threshold, the first detection result indicative of whether the first capacitive area was in a touch state.
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Specification