US20190354212A1 - Touch sensor, electronic paper display panel and electronic paper display apparatus - Google Patents

Touch sensor, electronic paper display panel and electronic paper display apparatus Download PDF

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Publication number
US20190354212A1
US20190354212A1 US16/368,887 US201916368887A US2019354212A1 US 20190354212 A1 US20190354212 A1 US 20190354212A1 US 201916368887 A US201916368887 A US 201916368887A US 2019354212 A1 US2019354212 A1 US 2019354212A1
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United States
Prior art keywords
sensing
transistor
terminal
touch
electronic paper
Prior art date
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Abandoned
Application number
US16/368,887
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English (en)
Inventor
Hsiao-Lung Cheng
Shu-Fen Tsai
Chi-Mao Hung
Kuang-Heng Liang
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E Ink Holdings Inc
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E Ink Holdings Inc
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Assigned to E INK HOLDINGS INC. reassignment E INK HOLDINGS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHENG, HSIAO-LUNG, HUNG, CHI-MAO, LIANG, KUANG-HENG, TSAI, SHU-FEN
Publication of US20190354212A1 publication Critical patent/US20190354212A1/en
Priority to US16/739,068 priority Critical patent/US10824290B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds

Definitions

  • the invention relates to a sensor, a display panel and a display apparatus, and particularly relates to a touch sensor, an electronic paper display panel and an electronic paper display apparatus.
  • an electronic paper display apparatus has advantages of light and slim, durable, low power consumption that meets the requirement of energy saving and environmental protection, etc., it is widely applied to electronic readers (for example, electronic books, electronic newspapers) or other electronic devices (for example, electronic tags).
  • electronic readers for example, electronic books, electronic newspapers
  • other electronic devices for example, electronic tags.
  • the electronic paper display apparatus may have a touch sensing function, it may provide an intuitive input method to the user to improve user's experience.
  • a touch sensor has to be exposed to air, and an internal layered structure thereof should not include, for example, an Indium Tin Oxide (ITO) conductive thin film or other similar conductive layer, so as to avoid covering other layered structures to cause a shielding effect and result in a fact that the touch sensor cannot implement a touch sensing operation.
  • a panel of the electronic paper display apparatus generally includes the ITO conductive thin film or other similar conductive layer.
  • the invention is directed to touch sensor, an electronic paper display panel and an electronic paper display apparatus, which include a shielding layer to provide a touch sensing function.
  • the invention provides a touch sensor adapted to sense a touch object.
  • the touch sensor includes a sensing device and a sensing circuit.
  • the sensing device includes a substrate, a sensing electrode, a sensing common electrode and a shielding layer.
  • the sensing electrode and the sensing common electrode are disposed on the substrate.
  • the shielding layer is disposed on the sensing electrode and the sensing common electrode.
  • the sensing circuit is electrically connected to the sensing device.
  • the sensing circuit includes a resistor device.
  • a relaxation frequency of a relaxation signal of the touch sensor is determined according to a resistance of the resistor device and/or a parasitic resistance of the sensing device.
  • a pulse difference of the relaxation signal is changed by the touch object, where the touch object is a conductor.
  • the touch sensor is operated in an operation frequency interval between a first frequency and a second frequency.
  • the second frequency is greater than the first frequency.
  • the sensing electrode and the sensing common electrode form a first capacitor device.
  • the shielding layer and the sensing electrode form a second capacitor device.
  • the shielding layer and the sensing common electrode form a third capacitor device.
  • the touch object touches the touch sensor to respectively form a fourth capacitor device and a fifth capacitor device with the shielding layer.
  • the sensing circuit receives a reference voltage.
  • the reference voltage is switched between a first voltage and a second voltage, and charges/discharges a first terminal of the first capacitor device to generate the relaxation signal.
  • the relaxation signal is oscillated between the first voltage and the second voltage.
  • the sensing circuit further includes an amplifier circuit.
  • the amplifier circuit has a first input terminal, a second input terminal and an output terminal.
  • the first input terminal receives the reference voltage.
  • the output terminal is coupled to a first terminal of the resistor device.
  • the second input terminal is coupled to a second terminal of the resistor device and the first terminal of the first capacitor device.
  • the shielding layer includes a conductive layer.
  • the invention provides an electronic paper display apparatus having a touch sensing function.
  • the electronic paper display apparatus includes an electronic paper display panel.
  • the electronic paper display panel includes a plurality of touch sensors.
  • Each of the touch sensors includes a sensing device and a sensing circuit.
  • the sensing device includes a substrate, a sensing electrode, a sensing common electrode and a shielding layer.
  • the sensing electrode and the sensing common electrode are disposed on the substrate.
  • the shielding layer is disposed on the sensing electrode and the sensing common electrode.
  • the sensing circuit is electrically connected to the sensing device.
  • the sensing circuit includes a resistor device.
  • a relaxation frequency of a relaxation signal of each of the touch sensors is determined according to a resistance of the resistor device and/or a parasitic resistance of the sensing device.
  • a pulse difference of the relaxation signal is changed by a touch object, where the touch object is a conductor.
  • a touch position of the touch object on the electronic paper display panel is determined by the pulse
  • the electronic paper display apparatus is a segmented electronic paper display apparatus.
  • the relaxation frequency of the relaxation signal of each of the touch sensors is determined according to the resistance of the resistor device.
  • the electronic paper display apparatus is a thin film transistor electronic paper display.
  • the relaxation frequency of the relaxation signal of each of the touch sensors is determined according to the resistance of the resistor device and the parasitic resistance of the sensing device.
  • the invention provides an electronic paper display panel having a touch sensing function.
  • the electronic paper display panel includes a plurality of pixel units.
  • the pixel units are arranged in an array.
  • the pixel units are electrically connected to one or a plurality of sensing circuits.
  • the pixel units are configured to sense a touch object.
  • Each of the sensing circuits includes a resistor device.
  • a relaxation frequency of a relaxation signal of each of the pixel units is determined according to a resistance of the resistor device and/or a parasitic resistance of the pixel unit.
  • a pulse difference of the relaxation signal is changed by the touch object, where the touch object is a conductor.
  • a touch position of the touch object on the electronic paper display panel is determined according to the pulse difference of the relaxation signal of each of the pixel units.
  • each of the pixel units includes a first transistor circuit and a second transistor circuit.
  • a first scan signal turns on a transistor in the first transistor circuit, and the pixel unit performs an image display operation.
  • a second scan signal turns on a transistor in the second transistor circuit, and the pixel unit performs a touch sensing operation.
  • the second transistor circuit is electrically connected to the first transistor circuit and the one or plurality of sensing circuits.
  • the second transistor circuit includes the touch capacitor device.
  • the touch object touches the pixel units to form a sensing capacitor device with the pixel units
  • the second transistor circuit further includes the sensing capacitor device.
  • the electronic paper display panel further includes a plurality of first scan lines and a plurality of second scan lines.
  • the first scan lines are electrically connected to the first transistor circuits. Each of the first scan lines is configured to provide the first scan signal to the first transistor circuit.
  • the second scan lines are electrically connected to the second transistor circuits. Each of the second scan lines is configured to provide the second scan signal to the second transistor circuit.
  • the electronic paper display panel further includes a plurality of data lines.
  • the data lines are electrically connected to the first transistor circuits.
  • Each of the data lines is configured to provide a data signal to the first transistor circuit.
  • the transistor in the first transistor circuit is turned on, and the pixel unit displays image data according to the data signal.
  • the second transistor circuits are electrically connected to the one or plurality of sensing circuits through the data lines.
  • the transistor in the second transistor circuit is turned on, and the one or plurality of sensing circuits charges/discharges one terminal of the touch capacitor device through the data lines to generate the relaxation signal.
  • the electronic paper display panel further includes a plurality of sensing lines.
  • the sensing lines are electrically connected to the second transistor circuits.
  • the second transistor circuits are electrically connected to one or plurality of sensing circuits through the sensing lines. In the sensing mode, the transistor in the second transistor circuit is turned on, and the one or plurality of sensing circuits charges/discharges one terminal of the touch capacitor device through the data lines to generate the relaxation signal.
  • the electronic paper display panel further includes a plurality of first common electrode lines and a plurality of second common electrode lines.
  • the first common electrode lines are electrically connected to the first transistor circuits. Each of the first common electrode lines is configured to provide a first common electrode signal to the first transistor circuit.
  • the transistor in the first transistor circuit is turned on, and the pixel unit performs an image display operation according to the first common electrode signal.
  • the second common electrode lines are electrically connected to the second transistor circuits. Each of the second common electrode lines is configured to provide a second common electrode signal to the second transistor circuit.
  • the sensing mode the transistor in the second transistor circuit is turned on, and the pixel unit performs a touch sensing operation according to the second common electrode signal.
  • each of the pixel units further includes a third transistor circuit.
  • the third transistor circuit is electrically connected between the first transistor circuit and the second transistor circuit. In the display mode, a third scan signal turns on a transistor in the third transistor circuit to transmit a data signal to the third transistor circuit, and in the display mode, the transistor in the second transistor circuit is not turned on.
  • the third scan signal in the sensing mode, does not turn on the transistor in the third transistor circuit, and in the sensing mode, the transistor in the second transistor circuit is turned on, and the pixel unit performs a touch sensing operation.
  • the electronic paper display panel further includes a plurality of third scan lines.
  • the third scan lines are electrically connected to the third transistor circuits.
  • Each of the third scan lines is configured to provide the third scan signal to the third transistor circuit.
  • the third scan signal turns on the transistor in the third transistor circuit, and the pixel unit performs the image display operation.
  • the electronic paper display panel further includes a plurality of sensing lines.
  • the sensing lines are electrically connected to the second transistor circuits.
  • the second transistor circuits are electrically connected to one or a plurality of sensing circuits through the sensing lines. In the sensing mode, the transistor in the second transistor circuit is turned on, and the one or plurality of sensing circuits charges/discharges one terminal of the touch capacitor device through the data lines to generate the relaxation signal.
  • the electronic paper display panel further includes a plurality of first common electrode lines.
  • the first common electrode lines are electrically connected to the first transistor circuits and the third transistor circuits.
  • Each of the first common electrode lines is configured to provide a first common electrode signal to the first transistor circuits and the third transistor circuits.
  • transistors in the first transistor circuits and the third transistor circuits are turned on, and the pixel unit performs the image display operation according to the first common electrode signal.
  • the one or plurality of sensing circuits respectively receive a reference voltage, and charge/discharge a first terminal of each of the touch capacitor devices to generate the relaxation signal.
  • the reference voltage is switched between a first voltage and a second voltage.
  • the relaxation signal is oscillated between the first voltage and the second voltage.
  • the sensing circuit further includes an amplifier circuit.
  • the amplifier circuit has a first input terminal, a second input terminal and an output terminal.
  • the first input terminal receives the reference voltage
  • the output terminal is coupled to one terminal of the resistor device
  • the second input terminal is coupled to another terminal of the resistor device and the first terminal of the touch capacitor device.
  • the pixel units are divided into one or a plurality of pixel unit groups, the one or plurality of pixel unit groups are respectively and electrically connected to one corresponding sensing circuit in the one or plurality of sensing circuits.
  • the invention provides an electronic paper display panel having a touch sensing function.
  • the electronic paper display panel includes a plurality of pixel units.
  • the pixel units are arranged in an array to sense a touch object.
  • Each of the pixel units includes a first transistor, a pixel capacitor device, a storage capacitor device, a second transistor, a touch capacitor device and a sensing capacitor device.
  • the first transistor has a first terminal, a second terminal and a control terminal.
  • the first terminal of the first transistor is electrically connected to a data line.
  • the control terminal of the first transistor is electrically connected to a first scan line.
  • the pixel capacitor device has a first terminal and a second terminal.
  • the first terminal of the pixel capacitor device is electrically connected to the second terminal of the first transistor.
  • the second terminal of the pixel capacitor device is electrically connected to a first common electrode line.
  • the storage capacitor device has a first terminal and a second terminal. The first terminal of the storage capacitor device is electrically connected to the second terminal of the first transistor. The second terminal of the storage capacitor device is electrically connected to the first common electrode line.
  • the second transistor has a first terminal, a second terminal and a control terminal. The first terminal of the second transistor is electrically connected to the data line. The control terminal of the second transistor is electrically connected to a second scan line.
  • the touch capacitor device has a first terminal and a second terminal. The first terminal of the touch capacitor device is electrically connected to the second terminal of the second transistor. The second terminal of the touch capacitor device is electrically connected to a second common electrode line.
  • the sensing capacitor device has a first terminal and a second terminal.
  • the first terminal of the sensing capacitor device is electrically connected to the second terminal of the second transistor.
  • the second terminal of the sensing capacitor device is electrically connected to the second common electrode line.
  • the data line is electrically connected to one corresponding sensing circuit in one or a plurality of sensing circuits.
  • the sensing circuit includes a resistor device.
  • a relaxation frequency of a relaxation signal of each of the pixel units is determined according to a resistance of the resistor device and/or a parasitic resistance of the pixel unit.
  • a pulse difference of the relaxation signal is changed by the touch object, where the touch object is a conductor.
  • a touch position of the touch object on the electronic paper display panel is determined by the pulse difference of the relaxation signal of each of the pixel units.
  • each of the pixel units includes a third transistor.
  • the third transistor has a first terminal, a second terminal and a control terminal.
  • the first terminal of the third transistor is electrically connected to the second terminal of the second transistor.
  • the second terminal of the third transistor is electrically connected to the second terminal of the first transistor.
  • the control terminal of the third transistor is electrically connected to a third scan line.
  • the first terminal of the second transistor is electrically connected to a sensing line.
  • the electronic paper display panel further includes the first scan lines, the second scan line, the data lines, the first common electrode lines and the second common electrode lines.
  • the first scan lines, the second scan lines and the first common electrode lines are arranged in a first direction.
  • the data lines and the second common electrode lines are arranged in a second direction.
  • the electronic paper display panel further includes a plurality of third scan lines and a plurality of sensing lines.
  • the third scan lines are arranged in the first direction.
  • the sensing lines are arranged in the second direction.
  • the sensing circuit receives a reference voltage, and charges/discharges the first terminal of the touch capacitor device to generate the relaxation signal.
  • the reference voltage is switched between a first voltage and a second voltage.
  • the relaxation signal is oscillated between the first voltage and the second voltage.
  • the sensing circuit further includes an amplifier circuit having a first input terminal, a second input terminal and an output terminal.
  • the first input terminal receives the reference voltage.
  • the output terminal is coupled to one terminal of the resistor device.
  • the second input terminal is coupled to another terminal of the resistor device and the first terminal of the touch capacitor device.
  • the touch sensor includes the shielding layer, the relaxation frequency thereof is determined according to the resistance of the resistor device and the capacitance of the capacitor device, and is changed by the touch object to provide good sensing quality.
  • the relaxation frequency is determined according to the parasitic resistance and the parasitic capacitance of the pixel units, the first voltage, the second voltage, and parasitic resistance of a tracing on the transistor circuit.
  • the electronic paper display panel and the electronic paper display apparatus including the touch sensor are adapted to provide the touch sensing function.
  • FIG. 1 is a schematic diagram of a touch sensor according to an embodiment of the invention.
  • FIG. 2 is a structural schematic diagram of a sensing device of the embodiment of FIG. 1 .
  • FIG. 3 and FIG. 4 are respectively equivalent circuit schematic diagrams of the touch sensor of the embodiment of FIG. 1 in different operation frequencies.
  • FIG. 5 is a schematic diagram of an operation frequency interval of the touch sensor of FIG. 1 implementing a touch sensing operation.
  • FIG. 6 is a waveform diagram of a relaxation signal according to an embodiment of the invention.
  • FIG. 7 is a schematic diagram of an electronic paper display apparatus according to an embodiment of the invention.
  • FIG. 8 is a structural schematic diagram of an electronic paper display panel of the embodiment of FIG. 7 .
  • FIG. 9 is a structural schematic diagram of an electronic paper display panel according to an embodiment of the invention.
  • FIG. 10 is a circuit schematic diagram of the electronic paper display panel of the embodiment of FIG. 9 .
  • FIG. 11 and FIG. 12 are schematic diagrams of a pixel unit of the embodiment of FIG. 9 operated in different operation modes.
  • FIG. 13 is a circuit schematic diagram of an electronic paper display panel according to another embodiment of the invention.
  • FIG. 14 is a circuit schematic diagram of an electronic paper display panel according to another embodiment of the invention.
  • FIG. 15 and FIG. 16 are respectively schematic diagrams of a pixel unit of the embodiment of FIG. 14 operated in different operation modes.
  • FIG. 17 is a structural schematic diagram of an electronic paper display panel according to another embodiment of the invention.
  • FIG. 18 is a structural schematic diagram of an electronic paper display panel according to another embodiment of the invention.
  • FIG. 19 is a schematic diagram of an electronic paper display apparatus according to another embodiment of the invention.
  • FIG. 20 is an equivalent circuit schematic diagram of a touch sensor operated in any frequency within an operation frequency interval according to another embodiment of the invention.
  • FIG. 21 is a schematic diagram of a driver device according to an embodiment of the invention.
  • FIG. 22 is a schematic diagram of a sensing device of the embodiment of FIG. 21 .
  • a plurality of embodiments is provided below to describe the invention, though the invention is not limited to the provided embodiments, and the provided embodiments may be suitably combined.
  • a term “couple” used in the full text of the disclosure (including the claims) refers to any direct and indirect connections. For example, if a first device is described to be coupled to a second device, it is interpreted as that the first device is directly coupled to the second device, or the first device is indirectly coupled to the second device through other devices or connection means.
  • a term “signal” refers to at least a current, a voltage, a charge, a temperature, data, an electromagnetic wave or any other one or more signals.
  • FIG. 1 is a schematic diagram of a touch sensor according to an embodiment of the invention.
  • FIG. 2 is a structural schematic diagram of a sensing device of the embodiment of FIG. 1 .
  • FIG. 3 and FIG. 4 are respectively equivalent circuit schematic diagrams of the touch sensor of the embodiment of FIG. 1 in different operation frequencies.
  • the touch sensor 100 of the embodiment is used for sensing a touch object 200 .
  • the touch object 200 is a conductor, for example, user's finger or a touch control device.
  • the touch sensor 100 includes a sensing device 110 and a sensing circuit 120 .
  • the sensing circuit 120 is electrically connected to the sensing device 110 .
  • the sensing circuit 120 is used for charging/discharging the sensing device 110 to generate a relaxation signal, and a relaxation frequency thereof is an operation frequency of the touch sensor 100 .
  • a pulse difference of the relaxation signal of the touch sensor 100 is changed by the touch object 200 .
  • the pulse difference of the relaxation signal is accordingly changed. Therefore, whether the touch object 200 touches the touch sensor 100 may be determined according to a magnitude of the pulse difference of the relaxation signal.
  • the sensing device 100 includes a substrate 112 , a sensing electrode 114 , a sensing common electrode 116 and a shielding layer 118 .
  • the sensing electrode 114 and the sensing common electrode 116 are disposed on the substrate 112 .
  • the sensing electrode 114 and the sensing common electrode 116 form a first capacitor device C 1 .
  • the sensing electrode 114 is used for transmitting a sensing signal
  • the sensing common electrode 116 is, for example, coupled to a ground voltage, and is used for providing a reference voltage for a touch sensing operation.
  • the sensing common electrode 116 may also be coupled to a predetermined common electrode signal, or kept in a floating state, which is not limited by the invention.
  • the shielding layer 118 is disposed on the sensing electrode 114 and the sensing common electrode 116 .
  • the shielding layer 118 and the sensing electrode 114 form a second capacitor device C 2 .
  • the shielding layer 118 and the sensing common electrode 116 form a third capacitor device C 3 .
  • the shielding layer 118 is a transparent conductive thin film, for example, an Indium Tin Oxide (ITO) conductive thin film, or other similar conductive layer.
  • the shielding layer 118 for example, includes a nano silver wire layer.
  • the material and the type of the shielding layer 118 are not limited by the invention.
  • the touch object 200 contacts the sensing device 110 to respectively form a fourth capacitor device C 4 and a fifth capacitor device C 5 with the shielding layer 118 .
  • a capacitance of each of the capacitance devices is, for example, determined according to a material characteristic of each of the layers.
  • the sensing circuit 120 includes an amplifier circuit 122 and a resistor device R.
  • the amplifier circuit 122 has a first input terminal (a non-inverting terminal), a second input terminal (an inverting terminal) and an output terminal.
  • the first input terminal receives a reference voltage Vref.
  • the output terminal is coupled to one terminal of the resistor device R.
  • the second input terminal is coupled to another terminal of the resistor device R and a terminal N of the first capacitor device C 1 .
  • the sensing circuit 120 for example, includes a relaxation oscillator, and a framework thereof is schematically described, and the sensing circuit 120 may be implemented by the framework of any sensing circuit of the field, which is not limited by the invention. Enough instructions and recommendations for the detailed framework and implementation method thereof may be learned from ordinary knowledge of the art, and details thereof are not repeated.
  • FIG. 5 is a schematic diagram of an operation frequency interval of the touch sensor of FIG. 1 implementing a touch sensing operation.
  • FIG. 6 is a waveform diagram of a relaxation signal according to an embodiment of the invention.
  • the touch sensor 100 of the embodiment is, for example, operated in an operation frequency interval BW between a first frequency f 1 and a second frequency f 2 , where the second frequency f 2 is greater than the first frequency f 1 .
  • the operation frequency interval BW is between 2 MHz and 3.6 MHz, though the invention is not limited thereto.
  • the operation frequency is substantially greater than 780 KHz.
  • the touch sensor 100 is, for example, applied to an electronic paper display apparatus, as shown in FIG. 7 , to perform touch sensing.
  • the electronic paper display apparatus is a segmented electronic paper display apparatus
  • an operation frequency thereof is substantially greater than 750 KHz
  • the relaxation frequency of the relaxation signal of each touch sensor 100 is determined according to a resistance of the resistor device R.
  • the operation frequency interval BW is, for example, between 2 MHz and 3.6 MHz
  • the relaxation frequency of the relaxation signal of each touch sensor 100 is determined according to the resistance of the resistor device R and a parasitic resistance of the sensing device 110 .
  • the relaxation frequency may be determined according to a parasitic resistance and a parasitic capacitance of a pixel unit, a first voltage, a second voltage, and a parasitic resistance of a tracing of a transistor circuit.
  • FIG. 3 is an equivalent circuit schematic diagram of the touch sensor 100 operated in any frequency outside the operation frequency interval BW.
  • the fourth capacitor device C 4 and the fifth capacitor device C 5 are shielded.
  • FIG. 4 is an equivalent circuit schematic diagram of the touch sensor 100 operated in any frequency within the operation frequency interval BW.
  • the second capacitor device C 2 and the third capacitor device C 3 present a short-circuit state.
  • the reference voltage Vref is, for example, set to the second voltage V 2
  • the amplifier circuit 122 charges the terminal N of the first capacitor device C 1 through the resistor device R, and a signal waveform of the relaxation signal S is increased toward the second voltage V 2 .
  • the reference voltage Vref is, for example, switched to the first voltage V 1
  • the amplifier circuit 122 discharges the terminal N of the first capacitor device C 1 through the resistor device R, and the signal waveform of the relaxation signal S is decreased toward the first voltage V 1 .
  • the reference voltage Vref is switched between the first voltage V 1 and the second voltage V 2 , and charges/discharges the terminal N of the first capacitor device C 1 to generate the relaxation signal S.
  • the relaxation signal S is oscillated between the first voltage V 1 and the second voltage V 2 , and in the embodiment of the segmented electronic paper display apparatus, the relaxation frequency of the relaxation signal S is determined according to the resistance of the resistor device R. In the embodiment of the thin film transistor electronic paper display apparatus, the relaxation frequency of the relaxation signal S is determined according to the resistance of the resistor device R and the parasitic resistance of the sensing device 110 . In an embodiment, the relaxation frequency may be determined according to a parasitic resistance and a parasitic capacitance of a pixel unit, the first voltage, the second voltage, and a parasitic resistance of a tracing of a transistor circuit.
  • the fourth capacitor device C 4 and the fifth capacitor device C 5 exist.
  • the relaxation frequency is changed, for example, decreased in response to the touch object 200 .
  • a pulse number of the relaxation signal S is decreased. Therefore, in the embodiment, one of the methods for determining a change of the relaxation frequency is to determine whether the pulse number of the relaxation signal S is changed during the sensing period GT.
  • a pulse difference of the relaxation signal S is changed by the touch object (for example, a touched conductor). Whether the touch object 200 touches the touch sensor may be determined according to the pulse difference of the relaxation signal S.
  • one of the methods for determining whether the pulse number of the relaxation signal S is changed during the sensing period GT is, for example, to transmit the relaxation signal S to a counter circuit (not shown) or other similar circuit.
  • the counter circuit is, for example, electrically connected to an output of the amplifier circuit 122 to receive the relaxation signal S, and counts the pulse number of the relaxation signal S during the sensing period GT.
  • the counter circuit is, for example, an external circuit independent to the sensing circuit 120 , or a counter circuit configured in the sensing circuit 120 .
  • the counter circuit may be implemented by a framework of any type of the counter circuit of the technical field, which is not limited by the invention. Enough instructions and recommendations for the detailed framework and implementation method thereof may be learned from ordinary knowledge of the art, and details thereof are not repeated.
  • whether the touch object 200 touches the touch sensor 100 may be determined according to the pulse difference of the relaxation signal S.
  • the touch sensors are arranged on a substrate in an array to construct a touch sensing panel. A touch position of the touch object 200 on the touch sensing panel is determined by whether the pulse difference of the relaxation signal S of each of the touch sensors is changed.
  • FIG. 7 is a schematic diagram of an electronic paper display apparatus according to an embodiment of the invention.
  • FIG. 8 is a structural schematic diagram of an electronic paper display panel of the embodiment of FIG. 7 .
  • the electronic paper display apparatus 300 of the embodiment has a touch sensing function.
  • the electronic paper display apparatus 300 includes an electronic paper display panel 310 and a driver device 320 .
  • the driver device 320 is electrically connected to the electronic paper display panel 310 .
  • the driver device 320 is used for driving the electronic paper display panel 310 to display an image frame, and perform a touch sensing operation.
  • the electronic paper display panel 310 includes a plurality of the touch sensors 100 shown in FIG. 1 .
  • the electronic paper display panel 310 includes a plurality of sensing devices 110 .
  • the sensing circuit 120 may be disposed in the driver device 320 , or integrated with the electronic paper display panel 310 , or disposed in other external circuit.
  • the configuration position of the sensing circuit 120 is not limited by the invention.
  • the relaxation frequency of the relaxation signal of each of the touch sensors 110 is determined by the resistance of the resistor device R in the sensing circuit 120 and/or the parasitic resistance in the sensing device 110 .
  • the pulse difference of the relaxation signal is changed by the touch object 200 .
  • a touch position of the touch object 200 on the electronic paper display panel 310 is determined according to the pulse difference of the relaxation signal of each of the touch sensors 100 .
  • the relaxation frequency may also be determined according to a parasitic resistance and a parasitic capacitance of a pixel unit, a first voltage, a second voltage, and a parasitic resistance of a tracing of a transistor circuit.
  • enough instructions, recommendations and implementations for the touch sensing operation of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 6 , and details thereof are not repeated.
  • the electronic paper display apparatus 300 is, for example, a segmented electronic paper display apparatus or a thin film transistor electronic paper display apparatus, though the invention is not limited thereto.
  • a design of the driver device 320 is adjusted to be adapted to the electronic paper display apparatus 300 , and the driver device 320 may be implemented by a suitable circuit framework of the technical field, which is not limited by the invention.
  • the electronic paper display panel 310 includes the shielding layer 118 .
  • the shielding layer 118 includes an indium tin oxide conductive film, or a nano silver wire layer or other similar conductive layer, though the invention is not limited thereto.
  • the electronic paper display apparatus 300 determines the touch position of the touch object 200 on the electronic paper display panel 310 according to the pulse difference of the relaxation signal of each of the touch sensors 100 . Existence of the shielding layer 118 does not influence the touch sensing operation of the electronic paper display apparatus 300 .
  • FIG. 9 is a structural schematic diagram of an electronic paper display panel according to an embodiment of the invention.
  • FIG. 10 is a circuit schematic diagram of the electronic paper display panel of the embodiment of FIG. 9 .
  • the electronic paper display panel 400 of the embodiment includes a plurality of first scan lines SL 1 , a plurality of second scan lines SL 2 , a plurality of data lines DL 1 , a plurality of first common electrode lines CL 1 , a plurality of second common electrode lines CL 2 and a plurality of pixel units 410 .
  • the pixel units 410 are arranged in an array, and are electrically connected to one or a plurality of sensing circuits 420 through the data lines DL 1 .
  • the sensing circuits 420 may be integrated on the electronic paper display panel 310 , or disposed in other external circuit.
  • the pixel units 410 are used for sensing the touch object 200 of FIG. 2 or FIG. 8 .
  • the pixel units 410 in a same column are connected to the same sensing circuit 420 .
  • the pixel units in different columns may also be connected to a same sensing circuit.
  • the pixel unit may also be properly grouped, and the pixel units of the same group share a same sensing circuit.
  • the number of the sensing circuits 420 is not limited by the invention.
  • the pixel unit 410 includes a first transistor circuit 412 and a second transistor circuit 414 .
  • the first transistor circuit 412 includes a first transistor Q 1 , a pixel capacitor device Cp and a storage capacitor device Cst.
  • the second transistor circuit 414 includes a second transistor Q 2 , a touch capacitor device Ctc and a sensing capacitor device Cf.
  • the touch capacitor device Ctc includes the first capacitor device C 1 , the second capacitor device C 2 and the third capacitor device C 3 of FIG. 2 .
  • the touch capacitor device Ctc is, for example, one of the first capacitor device C 1 , the second capacitor device C 2 and the third capacitor device C 3 , or an equivalent capacitor device of a combination of the above three capacitor devices connected in series or parallel.
  • the sensing capacitor device Cf includes the fourth capacitor device C 4 and the fifth capacitor device C 5 of FIG. 2 .
  • the sensing capacitor device Cf is, for example, one of the fourth capacitor device C 4 and the fifth capacitor device C 5 , or an equivalent capacitor device of a combination of the above two capacitor devices connected in series or parallel.
  • a first terminal of the first transistor Q 1 is electrically connected to the data line DL 1 .
  • a second terminal of the first transistor Q 1 is electrically connected to a first terminal of the pixel capacitor device Cp and a first terminal of the storage capacitor device Cst.
  • a control terminal of the first transistor Q 1 is electrically connected to the first scan line SL 1 .
  • a first terminal of the pixel capacitor device Cp is electrically connected to the second terminal of the first transistor Q 1 .
  • a second terminal of the pixel capacitor device Cp is electrically connected to the first common electrode line CL 1 .
  • a first terminal of the storage capacitor device Cst is electrically connected to the second terminal of the first transistor Q 1 .
  • a second terminal of the storage capacitor device Cst is electrically connected to the first common electrode line CL 1 .
  • the first scan line SL 1 and the first common electrode line CL 1 are respectively used for providing a first scan signal and a first common electrode signal to the first transistor Q 1 .
  • the data line DL 1 is used for providing a data signal to the first transistor Q 1 .
  • the first scan signal is transmitted through the first scan line SL 1 , and turns on the first transistor Q 1 in the display mode, such that the pixel unit 410 performs an image display operation to display image data according to the data signal and the first common electrode signal.
  • a first terminal of the second transistor Q 2 is electrically connected to the data line DL 1 .
  • a second terminal of the second transistor Q 2 is electrically connected to a first terminal of the touch capacitor device Ctc and a first terminal of the sensing capacitor device Cf
  • a control terminal of the second transistor Q 2 is electrically connected to the second scan line SL 2 .
  • a first terminal of the touch capacitor device Ctc is electrically connected to the second terminal of the second transistor Q 2 .
  • a second terminal of the touch capacitor device Ctc is electrically connected to the second common electrode line CL 2 .
  • a first terminal of the sensing capacitor device Cf is electrically connected to the second terminal of the second transistor Q 2 .
  • a second terminal of the sensing capacitor device Cf is electrically connected to the second common electrode line CL 2 .
  • the second scan line SL 2 and the second common electrode line CL 2 are respectively used for providing a second scan signal and a second common electrode signal to the second transistor Q 2 .
  • the second scan signal is transmitted through the second scan line SL 2 , and turns on the second transistor Q 2 in a sensing mode, such that the pixel unit 410 performs a touch sensing operation to sense the touch object 200 according to the second common electrode signal.
  • the second transistor Q 2 is turned on, and the sensing circuit 420 charges/discharges the first terminal of the touch capacitor device Ctc through the data line DL 1 to generate the relaxation signal S shown in FIG. 6 .
  • enough instructions, recommendations and implementations for the method of generating the relaxation signal S of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 6 , and details thereof are not repeated.
  • the first scan lines SL 1 , the second scan lines SL 2 and the first common electrode lines CL 1 are arranged in a first direction Y.
  • the data lines DL 1 and the second common electrode lines CL 2 are arranged in a second direction X.
  • the first direction Y and the second direction X are different, and are perpendicular to each other in FIG. 10 .
  • FIG. 11 and FIG. 12 are schematic diagrams of the pixel unit of the embodiment of FIG. 9 operated in different operation modes.
  • FIG. 11 illustrates a situation that the pixel unit 410 is operated in the display mode
  • FIG. 12 illustrates a situation that the pixel unit 410 is operated in the sensing mode.
  • the first scan signal turns on the first transistor Q 1
  • the second scan signal does not turn on the second transistor Q 2 .
  • the data signal is transmitted to the first transistor circuit 412 through a signal transmission path 510 .
  • the pixel unit 410 performs the image display operation to display image data according to the data signal and the first common electrode signal.
  • the first scan signal does not turn on the first transistor Q 1
  • the second scan signal turns on the second transistor Q 2 .
  • the sensing circuit 420 charges/discharges the first terminal of the touch capacitor device Ctc through the data line DL 1 to generate the relaxation signal S of FIG. 6 .
  • the relaxation signal S is transmitted through a signal transmission path 520 .
  • the relaxation frequency of the relaxation signal S of each of the pixel units 410 is determined according to the resistance of the resistor device R and/or the parasitic resistance therein.
  • the pulse difference of the relaxation signal is changed by the touch object 200 .
  • the touch object 200 touches the pixel unit 410
  • the touch object 200 and the pixel unit 410 form the sensing capacitor device Cf.
  • the touch position of the touch object 200 on the electronic paper display panel 400 may be determined according to the pulse difference of the relaxation signal of each of the pixel units 410 .
  • the relaxation frequency may also be determined according to a parasitic resistance and a parasitic capacitance of the pixel unit, the first voltage, the second voltage, and a parasitic resistance of a tracing of the transistor circuit.
  • enough instructions, recommendations and implementations for the touch sensing operation of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 6 , and details thereof are not repeated.
  • the second transistor circuit 414 and the first transistor circuit 412 share the data line DL 1 to transmit the relaxation signal S, though the invention is not limited thereto. In another embodiment, the second transistor circuit 414 may also adopt other signal line to transmit the relaxation signal S.
  • FIG. 13 is a circuit schematic diagram of an electronic paper display panel according to another embodiment of the invention.
  • the electronic paper display panel 800 of the embodiment is similar to the electronic paper display panel 400 of the embodiment of FIG. 10 , and a main difference there between is that the electronic paper display panel 800 further includes a plurality of sensing lines DL 2 , and the second transistor circuit 814 uses the sensing lines DL 2 to transmit the relaxation signal S.
  • the sensing line DL 2 is electrically connected to the second transistor circuit 814 .
  • the second transistor circuit 814 is electrically connected to the sensing circuit 820 through the sensing line DL 2 .
  • the second transistor Q 2 is turned on, and the sensing circuit 820 charges/discharges the first terminal of the touch capacitor device Ctc through the sensing line DL 2 to generate the relaxation signal S.
  • enough instructions, recommendations and implementations for the touch sensing operation of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 12 , and details thereof are not repeated.
  • FIG. 14 is a circuit schematic diagram of an electronic paper display panel according to another embodiment of the invention.
  • the electronic paper display panel 600 of the embodiment is similar to the electronic paper display panel 400 of the embodiment of FIG. 10 , and a main difference there between is that the electronic paper display panel 600 further includes a plurality of third scan lines SL 3 and a plurality of sensing lines DL 2 , and the pixel unit 610 further includes a third transistor circuit 616 .
  • the third transistor circuit 616 is electrically connected between a first transistor circuit 612 and a second transistor circuit 614 .
  • the third transistor circuit 616 includes a third transistor Q 3 .
  • a first terminal of the third transistor Q 3 is electrically connected to the second terminal of the second transistor Q 2 .
  • a second terminal of the third transistor Q 3 is electrically connected to the second terminal of the first transistor Q 1 .
  • a control terminal of the third transistor Q 3 is electrically connected to the third scan line SL 3 .
  • the first terminal of the second transistor Q 2 is electrically connected to the sensing line DL 2 .
  • the third scan line SL 3 and the first common electrode line CL 1 are respectively used for providing a third scan signal and the first common electrode signal to the third transistor Q 3 .
  • the data line DL 1 is used for providing the data signal to the first transistor Q 1 and the third transistor Q 3 .
  • the first scan signal and the third scan signal are transmitted through the first scan line SL 1 and the third scan line SL 3 , and turn on the first transistor Q 1 and the third transistor Q 3 in the display mode, and the second transistor Q 2 is not turned on, such that the pixel unit 610 performs the image display operation to display image data according to the data signal and the first common electrode signal.
  • the second scan line SL 2 and the second common electrode line CL 2 are respectively used for providing a second scan signal and a second common electrode signal to the second transistor Q 2 .
  • the second scan signal is transmitted through the second scan line SL 2 , and turns on the second transistor Q 2 in the sensing mode, and the third transistor Q 3 is not turned on, such that the pixel unit 610 performs the touch sensing operation to sense the touch object 200 according to the second common electrode signal.
  • the second transistor Q 2 is turned on, and the sensing circuit 620 charges/discharges the first terminal of the touch capacitor device Ctc through the sensing line DL 2 to generate the relaxation signal S of FIG. 6 .
  • enough instructions, recommendations and implementations for the method of generating the relaxation signal S of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 6 , and details thereof are not repeated.
  • the first scan line SL 1 , the second scan line SL 2 , the third scan line SL 3 and the first common electrode line CL 1 are arranged in the first direction Y.
  • the data line DL 1 , the sensing line DL 2 and the second common electrode line CL 2 are arranged in the second direction X.
  • the first direction Y and the second direction X are different to each other, and are perpendicular to each other in FIG. 14 .
  • FIG. 15 and FIG. 16 are respectively schematic diagrams of the pixel unit of the embodiment of FIG. 14 operated in different operation modes.
  • FIG. 15 illustrates a situation that the pixel unit 610 is operated in the display mode
  • FIG. 16 illustrates a situation that the pixel unit 610 is operated in the sensing mode.
  • the first scan signal turns on the first transistor Q 1
  • the third scan signal turns on the third transistor Q 3
  • the second scan signal does not turn on the second transistor Q 2
  • the data signal is transmitted to the first transistor circuit 612 and the third transistor circuit 616 through a signal transmission path 710 .
  • the pixel unit 610 performs the image display operation to display image data according to the data signal and the first common electrode signal.
  • the first scan signal does not turn on the first transistor Q 1
  • the third scan signal does not turn on the third transistor Q 3
  • the second scan signal turns on the second transistor Q 2 .
  • the sensing circuit 620 charges/discharges the first terminal of the touch capacitor device Ctc through the sensing line DL 2 to generate the relaxation signal S of FIG. 6 .
  • the relaxation signal S is transmitted through a signal transmission path 720 .
  • the relaxation frequency of the relaxation signal S of each of the pixel units 610 is determined according to the resistance of the resistor device R and/or the parasitic resistance therein.
  • the pulse difference of the relaxation signal S is changed by the touch object 200 .
  • the touch object 200 touches the pixel unit 610
  • the touch object 200 and the pixel unit 610 form the sensing capacitor device Cf.
  • the touch position of the touch object 200 on the electronic paper display panel 600 may be determined according to the pulse difference of the relaxation signal of each of the pixel units 610 .
  • the relaxation frequency may also be determined according to a parasitic resistance and a parasitic capacitance of the pixel unit, the first voltage, the second voltage, and a parasitic resistance of a tracing of the transistor circuit.
  • enough instructions, recommendations and implementations for the touch sensing operation of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 13 , and details thereof are not repeated.
  • the electronic paper display panel 400 takes the single pixel unit 410 as a basic unit for sensing the touch object 200 , though the invention is not limited thereto.
  • the pixel units may also be properly grouped, and the pixel units of the same group may be taken as the basic unit for sensing the touch object 200 .
  • FIG. 17 is a structural schematic diagram of an electronic paper display panel according to another embodiment of the invention.
  • the electronic paper display panel 900 of the embodiment is similar to the electronic paper display panel 400 of the embodiment of FIG. 9 , and a main difference there between is that the pixel units 910 of the electronic paper display panel 900 are divided into one or a plurality of pixel unit groups 920 , for example, 4 pixel unit groups.
  • each of the pixel unit groups 920 is electrically connected to the corresponding sensing circuit.
  • the pixel unit groups 920 of the same column are electrically connected to a same sensing circuit.
  • the pixel units 910 in each of the pixel unit groups 920 for example, share the same sensing circuit.
  • enough instructions, recommendations and implementations for the touch sensing operation of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 16 , and details thereof are not repeated.
  • multiple columns of the pixel units 910 correspond to one common electrode 930 , and the common electrode 930 is disposed between the groups of the pixel unit groups, though the invention is not limited thereto.
  • the common column may also be disposed between the columns of the pixel units.
  • FIG. 18 is a structural schematic diagram of an electronic paper display panel according to another embodiment of the invention.
  • the electronic paper display panel 1000 of the embodiment is similar to the electronic paper display panel 900 of the embodiment of FIG. 17 , and a main difference there between is that the common electrode 1030 is disposed between the columns of the pixel units 610 .
  • the pixel units 1010 on the electronic paper display panel 1000 of the embodiment are divided into one or a plurality of pixel unit groups 1020 , for example, 4 pixel unit groups.
  • Each of the pixel unit groups 1020 is electrically connected to the corresponding sensing circuit.
  • the pixel unit groups 1020 of the same column are electrically connected to a same sensing circuit.
  • the pixel units 1010 in each of the pixel unit groups 1020 for example, share the same sensing circuit. Moreover, enough instructions, recommendations and implementations for the touch sensing operation of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 17 , and details thereof are not repeated.
  • FIG. 19 is a schematic diagram of an electronic paper display apparatus according to another embodiment of the invention.
  • the electronic paper display apparatus 1100 of the embodiment has the touch sensing function.
  • the electronic paper display apparatus 1100 includes a driver device 1110 and an electronic paper display panel 1120 .
  • the driver device 1110 is electrically connected to the electronic paper display panel 1120 .
  • the driver device 1110 is used for driving the electronic paper display panel 1120 to display image frames, and perform the touch sensing operation.
  • a layout method of the electrodes of the electronic paper display panel 1120 is, for example, as that shown in FIG. 17 or FIG. 18 , which is not limited by the invention.
  • the driver device 1110 includes a scan device 1112 and a sensing device 1114 .
  • the scan device 1112 is used for scanning a plurality of sensing blocks 1122 on the electronic paper display panel 1120 to perform the touch sensing operation.
  • the sensing device 1114 is used for controlling the scan device 1112 to scan the sensing blocks 1122 , and charges/discharges each of the sensing blocks 1122 to generate the relaxation signal S of FIG. 6 .
  • the sensing blocks 1122 are arranged in an array, and include a plurality of columns and a plurality of rows. Each of the sensing blocks 1122 includes one or a plurality of the sensing device 110 of FIG. 2 .
  • a resolution of the electronic paper display panel 1120 is, for example, 320 ⁇ 240, and in an embodiment, every 40 columns or rows construct one unit, and based on such unit, the electronic paper display panel 1120 , for example, includes 8 sensing channels and 6 scan channels. Therefore, the electronic paper display panel 1120 includes 48 sensing blocks 1122 . It should be noted that the resolution of the electronic paper display panel 1120 and the numbers of the sensing channels, the scan channels and the sensing blocks are only an example, and the invention is not limited thereto.
  • the scan device 1112 in the driver device 1110 used for driving the electronic paper display panel 1120 , includes a plurality of scan circuits 1111 , and the sensing device 1114 includes a plurality of sensing circuits 1113 .
  • the scan circuits 1111 are respectively and electrically connected to the sensing blocks 1122 of different rows.
  • the scan circuits 1111 for example, turn on the respectively connected sensing blocks 1122 during the sensing period GT of FIG. 6 to perform the touch sensing operation.
  • one of the sensing circuits 1113 _ 1 - 1113 _ 8 (for example, the sensing circuit 1113 _ 1 ) outputs a control signal Sctrl to control the scan circuits 1111 _ 1 - 1111 _ 6 based on rows to sequentially scan the sensing blocks 1122 of different rows on the electronic paper display panel 1120 .
  • the sensing circuits 1113 respectively and simultaneously charge/discharge the sensing blocks 1122 of different columns to generate the relaxation signal S.
  • one of the sensing circuits (for example, the sensing circuit 1113 _ 1 ) outputs a synchronization signal Ssyn to synchronize the other sensing circuits 1113 _ 2 - 1113 _ 8 to respectively and simultaneously charge/discharge the sensing blocks 1122 of different columns during the sensing period GT, so as to obtain the relaxation signal S of the sensing blocks 1122 of different columns.
  • the touch position of the touch object on the electronic paper display panel 1120 may be determined. For example, when the sensing block 1122 _ 33 is touched, a horizontal coordinate position (a first orientation) of the touch object on the electronic paper display panel 1120 may be determined according to a position of the sensing circuit 1113 _ 3 (located at a third column), and a vertical coordinate position (a second orientation) of the touch object on the electronic paper display panel 1120 may be determined according to a position of the scan circuit 1111 _ 3 (located at a third row).
  • the electronic paper display panel 1120 may implement a single-point or multi-point touch sensing operation, and enough instructions, recommendations and implementations for the operation method thereof may be learned from ordinary knowledge of the field, and details thereof are not repeated.
  • the sensing device 1114 charges/discharges each of the sensing blocks 1122 according to the first voltage V 1 and the second voltage V 2 of FIG. 6 to generate the relaxation signal S.
  • the pulse difference of the relaxation signal S is changed by the touch object.
  • the touch position of the touch object on the electronic paper display panel 1120 is determined according to the pulse difference of the relaxation signal S of each of the sensing blocks 1122 .
  • enough instructions, recommendations and implementations for the touch sensing operation of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 8 , and details thereof are not repeated.
  • the circuit structure of the electronic paper display panel 1120 is, for example, as that shown in FIG. 10 , which is a circuit structure where the two transistors share the data line to transmit the relaxation signal.
  • the circuit structure of the electronic paper display panel 1120 is, for example, as that shown in FIG. 13 , which is a circuit structure where the two transistors do not share the data line to transmit the relaxation signal.
  • the circuit structure of the electronic paper display panel 1120 is, for example, as that shown in FIG. 14 , which is a circuit structure where the three transistors share the data line to transmit the relaxation signal, or other similar circuit structure.
  • the circuit structure of the electronic paper display panel 1120 is not limited by the invention.
  • a circuit structure of the sensing circuit 1113 may be the same or similar with that of the sensing circuit 120 of FIG. 4 .
  • the circuit structure of the sensing circuit 1113 is not limited by the invention.
  • the sensing circuit 1113 for example, includes a counter circuit (not shown).
  • the counter circuit is used for setting the sensing period GT to receive the relaxation signal S.
  • the counter circuit counts a pulse number of the relaxation signal S during the sensing period.
  • the counter circuit is, for example, an external circuit different to the sensing circuit 113 , or a counter circuit configured in internal of the sensing circuit 1113 .
  • each of the sensing circuits 1113 may be implemented by a single microcontroller or other similar device, for example, a field-programmable gate array (FPGA).
  • the microcontroller for example, includes a function of a relaxation oscillator, a function of the counter circuit, etc.
  • the microcontroller further outputs the control signal Sctrl and the synchronization signal Ssyn to respectively control the scan operation of the scan circuits 1111 and synchronize the sensing operations of the other sensing circuits 1113 .
  • FIG. 20 is an equivalent circuit schematic diagram of a touch sensor operated in any frequency within an operation frequency interval according to another embodiment of the invention.
  • the touch sensor 2100 of the embodiment is similar to the touch sensor 100 of the embodiment of FIG. 4 , and a main difference there between lies in a circuit structure of a sensing circuit 2120 .
  • a sensing block 2110 for example, includes one or a plurality of the sensing devices 110 shown in FIG. 2 , so that a schematic diagram of an equivalent capacitance thereof is similar as that shown in FIG. 4 .
  • the sensing circuit 2120 includes a resistor device R, a latch circuit 222 , a first comparator circuit 224 and a second comparator circuit 226 .
  • the resistor device R has a first terminal and a second terminal.
  • the second terminal of the resistor device R is coupled to the sensing block 2110 .
  • the latch circuit 222 has a first input terminal, a second input terminal and an output terminal.
  • the output terminal of the latch circuit 222 is coupled to the first terminal of the resistor device R.
  • the latch circuit 222 for example, includes a RS latch, and the first input terminal, the second input terminal and the output terminal thereof are respectively a reset terminal, a setting terminal and a Q terminal of a RS flip-flop.
  • the first comparator circuit 224 has a first input terminal, a second input terminal and an output terminal.
  • the first input terminal of the first comparator circuit 224 is coupled to the second terminal of the resistor device R and the sensing block 2210 .
  • the second input terminal of the first comparator circuit 224 receives the first voltage V 1 .
  • the output terminal of the first comparator circuit 224 is coupled to the first input terminal of the latch circuit 222 .
  • the second comparator circuit 226 has a first input terminal, a second input terminal and an output terminal.
  • the first input terminal of the second comparator circuit 226 receives the second voltage V 2 .
  • the second input terminal of the second comparator circuit 226 is coupled to the second terminal of the resistor device R and the sensing block 2210 .
  • the output terminal of the second comparator circuit 226 is coupled to the second input terminal of the latch circuit 222 .
  • the touch object 200 touches the sensing block 2110 , if a voltage of a node N is smaller than the first voltage V 1 , the second voltage V 2 charges the first capacitor device C 1 until the voltage of the node N is greater than the second voltage V 2 .
  • the first capacitor device C 1 discharges toward the first voltage V 1 until the voltage of the node N is smaller than the first voltage V 1 .
  • the relaxation signal S is produced at the node N, as shown in FIG. 6 .
  • the fourth capacitor device C 4 and the fifth capacitor device C 5 exist.
  • the pulse difference of the relaxation signal S is changed (for example, decreased) by the touch object 200 .
  • the pulse number of the relaxation signal S is decreased. Therefore, in the embodiment, one of the methods for determining whether the relaxation frequency is changed is to, for example, determine whether the pulse number of the relaxation signal S is changed during the sensing period GT. In other words, in the embodiment, the pulse difference of the relaxation signal S is changed by the touch object. Whether the touch object 200 touches the sensing block 2110 is, for example, determined according to the pulse difference of the relaxation signal S.
  • the circuit structure of the sensing circuit 1113 is, for example, the same or similar to the sensing circuit 2120 of FIG. 20 .
  • the circuit structure of the sensing circuit 1113 is not limited by the invention.
  • FIG. 21 is a schematic diagram of a driver device according to an embodiment of the invention.
  • the driver device 230 of the embodiment is, for example, an integrated chip.
  • the driver device 230 includes a touch driving block 232 and a display driving block 234 .
  • the display driving block 234 is electrically connected to the touch driving block 232 .
  • the scan device and the sensing device are disposed in the touch driving block 232 .
  • the display driving block 234 includes a display driver, a first common electrode voltage control circuit, a first gate control circuit and a display data control circuit.
  • the first common electrode voltage control circuit is, for example, coupled to the first common electrode lines CL 1 of FIG. 10 , FIG. 13 or FIG. 14 , and is used for controlling supplying of the first common electrode signals.
  • the first gate control circuit is, for example, coupled to the first scan lines SL 1 of FIG. 10 , FIG. 13 or FIG. 14 , and is used for controlling a conduction state of the first transistor Q 1 according to the first scan signal.
  • the display data control circuit is, for example, coupled to the data line DL 1 of FIG. 10 or FIG. 13 , or the data line DL 1 of FIG. 14 .
  • the display data control circuit is used for controlling the data signal written to the first transistor Q 1 or the third transistor Q 3 . Therefore, the pixel unit performs the image display operation to display image data according to the data signal.
  • the display driver is used for driving and controlling the electronic paper display panel to perform the image display operation.
  • the display driver includes various circuit devices required for driving the electronic paper display panel.
  • the touch driving block 232 includes a scan device, a sensing device, a processor circuit, a counter circuit, a voltage generator circuit, a second common electrode voltage control circuit and a second gate control circuit (pixel control circuit).
  • a scan device is, for example, coupled to the second scan lines SL 2 of FIG. 10 , FIG. 13 or FIG. 14 .
  • the sensing device is, for example, coupled to the data lines DL 1 of FIG. 10 and the sensing lines DL 2 of FIG. 13 .
  • the voltage generator circuit for example, includes one or a plurality of programmable voltage sources, and is used for generating the first voltage V 1 and the second voltage V 2 .
  • the counter circuit is used for setting the sensing period GT, and counts the pulse number of the relaxation signal S of the node N.
  • the counter circuit may include two counters to execute the above two operation steps. For example, one of the counters is used for counting the pulse number of the relaxation signal S, and another counter is used for setting the sensing period GT.
  • the second common electrode voltage control circuit is, for example, coupled to the second common electrode lines CL 2 of FIG. 10 , FIG. 13 or FIG. 14 , and is used for controlling supplying of the second common electrode signals.
  • the second gate control circuit is, for example, coupled to the third scan lines SL 3 of FIG. 14 , and is used for controlling a conduction state of the third transistor Q 3 according to the third scan signal.
  • the second gate control circuit is selectively configured.
  • the processor circuit is, for example, used for receiving a sensing result of the sensing device, and calculates a touch position of the touch object on the electronic paper display panel according to the relaxation signal S of the sensing block. Enough instructions, recommendations and implementations for the touch sensing operation of the embodiment may be learned from related descriptions of the embodiments of FIG. 1 to FIG. 20 , and details thereof are not repeated.
  • designs of the display driver, the first common electrode voltage control circuit, the first gate control circuit, the display data control circuit, the processor circuit, the voltage generator circuit, the second common electrode voltage control circuit and the second gate control circuit are adjusted along with different electronic paper display panels, and are implemented by proper circuit structures of the technical field, which are not limited by the invention.
  • the devices or circuits included in each of the blocks in the integrated chip are only an example, and are not intended to be limiting of the invention, and may be adaptively adjusted by a designer according to an actual requirement.
  • FIG. 22 is a schematic diagram of a sensing device of the embodiment of FIG. 21 .
  • the sensing device 2214 of the embodiment includes a plurality of sensing circuits 2220 and a plurality of selector circuits 2230 .
  • the sensing circuits 2220 are connected to corresponding sensing channels.
  • the selector circuits 2230 are used for synchronously selecting the first voltage V 1 or the second voltage V 2 , and transmitting the selected voltage to amplifier circuits 2222 . Therefore, the voltage received by the amplifier circuits 2222 may be switched between the first voltage V 1 and the second voltage V 2 . Enough instructions, recommendations and implementations for the operation of the sensing device 2214 may be learned from related description of the embodiment of FIG. 19 , and details thereof are not repeated.
  • the driver device of the electronic paper display panel is used for scanning the sensing blocks, and charging/discharging the sensing blocks of different columns to perform the touch sensing operation.
  • the driver device includes a plurality of sensing circuits or a plurality of microprocessors to perform the touch sensing operation.
  • the driver device may be integrated into an integrated chip to drive the electronic paper display panel to perform the touch sensing operation.
  • the sensing block includes one or a plurality of touch sensors.
  • the touch sensor includes a shielding layer. Existence of the shielding layer does not influence the touch sensing operation of the touch sensor. Whether the touch object touches the touch sensor may be determined according to the pulse difference of the relaxation signal.
  • the electronic paper display panel and the electronic paper display apparatus including the touch sensor may provide the touch sensing function. The touch position of the touch object on the touch sensing panel may be determined according to whether the pulse difference of the relaxation signal of each touch sensor is changed.

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US16/368,887 2018-05-15 2019-03-29 Touch sensor, electronic paper display panel and electronic paper display apparatus Abandoned US20190354212A1 (en)

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TW107116396A TWI659352B (zh) 2018-05-15 2018-05-15 觸控感測器、電子紙顯示面板以及電子紙顯示器裝置

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