WO2013056472A1 - Drive method for active touch control system - Google Patents

Drive method for active touch control system Download PDF

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Publication number
WO2013056472A1
WO2013056472A1 PCT/CN2011/081152 CN2011081152W WO2013056472A1 WO 2013056472 A1 WO2013056472 A1 WO 2013056472A1 CN 2011081152 W CN2011081152 W CN 2011081152W WO 2013056472 A1 WO2013056472 A1 WO 2013056472A1
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WO
WIPO (PCT)
Prior art keywords
touch
signal
electrode
circuit
control
Prior art date
Application number
PCT/CN2011/081152
Other languages
French (fr)
Chinese (zh)
Inventor
陈其良
刘海平
Original Assignee
智点科技（深圳）有限公司
智点科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 智点科技（深圳）有限公司, 智点科技有限公司 filed Critical 智点科技（深圳）有限公司
Priority to PCT/CN2011/081152 priority Critical patent/WO2013056472A1/en
Priority to CN201180001856.5A priority patent/CN103221905B/en
Priority to TW101138818A priority patent/TW201322097A/en
Publication of WO2013056472A1 publication Critical patent/WO2013056472A1/en

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Classifications

    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • 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
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes

Definitions

  • the present invention relates to a touch screen, and more particularly to an active touch screen and a driving method thereof. Background technique
  • Touch is the most important way of human perception, the most natural way for people to interact with machines. Touch screen
  • Resistive touch screen is still the leading product on the market, but the structure of the two-layer substrate of the resistive touch screen makes the reflection of the touch screen greatly affect the brightness of the display when the touch screen and the display panel are stacked together. Display quality such as contrast, color saturation, etc., greatly degrades the overall display quality, and increases the brightness of the backlight of the display panel, which also causes the power consumption to rise; the analog resistive touch screen also has the problem of positioning drift, from time to time. Position calibration; In addition, the working mode of the resistive touch screen electrode makes the life of the touch screen shorter.
  • Infrared touch screens and ultrasonic touch screens do not affect display quality.
  • the infrared touch screen and the ultrasonic touch screen are costly, and water droplets and dust can affect the reliability of the touch screen operation, especially the infrared touch screen and the ultrasonic touch screen mechanism are complicated, and the power consumption is large, so that the infrared Touch screens and ultrasonic touch screens are basically not available on portable products.
  • the structure of the single-layer substrate of the flat capacitive touch screen makes the touch screen have little effect on the display quality when the touch screen and the display panel are stacked together.
  • the planar capacitive touch screen also has the problem of positioning drift. Position calibration is performed from time to time. Water droplets also affect the reliability of the touch screen operation; especially the planar capacitive touch screen consumes a lot of power and costs, and also makes the plane Capacitive touch screens are basically not available on portable products.
  • the projected capacitive touch screen can still be a single-layer substrate structure, and when the touch screen and the display panel are stacked together, the touch screen has little effect on the display quality.
  • the projected capacitive touch screen measures the influence of the finger or other touch object on the coupling capacitance between the electrodes of the touch screen.
  • the finger is detected by measuring the influence of the finger or other touch object on the charging and discharging of the touch screen electrode. Or the location of other touch objects on the touch screen.
  • the anchor point needs to be simulated, not a real digital touch screen.
  • Chinese patent ZL2010202966254 proposes an active touch system, which isolates the sensing electrode units arranged on the array on the touch screen through the active device unit array provided on the touch screen, so that the sensing units are respectively It can completely sense the change of capacitance caused by the touch object, making multi-touch easy and natural. Summary of the invention
  • the present invention is to provide a driving method for an active touch system, and effectively implements application of a touch excitation signal to each electrode line of an active touch screen, thereby realizing point-by-point independent detection of the sensing electrode unit arranged in the array. Measurement.
  • the basic working principle of the active touch system of the present invention is:
  • the sensing electrode unit and the active device unit are arranged in an array on the touch substrate, and two sets of intersecting control electrode lines and detection electrode lines are connected, and the detecting electrode lines are connected to the sensing electrode unit through the active device unit.
  • the control electrode line is used to control the on and off of the active device unit
  • the detection electrode line is used to apply the touch excitation signal to the sensing electrode unit, and the capacitive coupling between the sensing electrode and the touch object is detected.
  • a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the touch excitation signal on the sensing electrode unit passes through the coupling.
  • the capacitor portion leaks out or leaks through the coupling capacitor to other electrodes on the touch screen.
  • the touch circuit detects the change of the touch signal on the detection electrode line of the touch excitation signal by detecting each strip to the sensing electrode unit, and finds the detection electrode line with the largest leakage current or the leakage current exceeding a certain threshold value, and then combines the current
  • the control electrode line of the active device is turned on to determine the sensing electrode unit that generates the leakage current, thereby finding the position of the finger or other touch object on the touch substrate.
  • Thin film field effect transistor is a typical representative of active matrix devices.
  • the thin film transistor TFT gate is connected to the horizontal scanning line, the source is connected to the vertical data line, and the drain is connected to the load electrode (the drain and source definitions here are just custom sexual definition, the source level does not refer specifically to the level of the source electrode, but to the level of the lower of the source and drain electrodes.
  • the array of active devices arranged in the array allows each load electrode to be equipped with a semiconductor switching device that can be gated by pulses so that each load electrode is relatively independent.
  • TFTs Thin film field effect transistors
  • a_Si amorphous silicon
  • SiNx silicon nitride
  • the positive charge in silicon nitride is used to help attract electrons to form a channel, so TFTs using amorphous silicon processes are mostly of the OS type.
  • the contents of this manual are mainly described by the MN OS thin film transistor.
  • the PM0S thin film transistor can follow the same principle and will not be listed separately.
  • An active touch system is composed of an active touch panel and a touch circuit.
  • the active touch panel has an array of active device units and arrays arranged on the substrate.
  • the sensing electrode unit and the control electrode line and the detecting electrode line intersecting at least two groups, the control electrode lines and the detecting electrode lines are separated by an insulating layer;
  • the touch circuit has a touch excitation source and signal detection a circuit and a control circuit;
  • a sensing electrode unit on the active touch panel is connected to the active device, the active device is connected to the control electrode and the detecting electrode, and the detecting electrode is connected to the touch excitation source and the signal detecting circuit in the touch circuit, and the control electrode Connecting the control circuit in the touch circuit;
  • the touch circuit applies a control signal to each control electrode line in a scanning manner, controls the conduction state of the active device unit, and determines the change of the touch signal on the detection electrode line to determine The position of the touch point;
  • the control signal applied by the touch circuit to the control electrode line is a DC
  • an active touch system driving method the active touch system is composed of an active touch panel and a touch circuit, and the active touch panel has an array arranged on the substrate. a source device unit, a sensing electrode unit arranged in the array, and not less than two sets of intersecting control electrode lines and detecting electrode lines, wherein the control electrode lines and the detecting electrode lines are separated by an insulating layer;
  • the touch circuit has a touch excitation source, a signal detection circuit and a control circuit;
  • a sensing electrode unit on the active touch panel is connected to the active device, the active device is connected to the control electrode and the detection electrode, and the detection electrode is connected to the touch excitation source in the touch circuit
  • a signal detecting circuit the control electrode is connected to the control circuit in the touch circuit;
  • the touch circuit applies a control to each control electrode line in a scanning manner a signal, controlling an on state of the active device unit, and determining a position of the touch point by detecting a change of the touch signal on the detection electrode line; and the control signal applied
  • the touch signal is a DC signal
  • the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the DC touch signal applied to the detecting electrode line.
  • the touch signal is an AC signal
  • the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the AC touch signal applied to the detecting electrode line.
  • the touch signal is a DC signal
  • the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the DC touch signal applied to the detecting electrode line.
  • the touch signal is an AC signal
  • the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the AC touch signal applied to the detecting electrode line.
  • the frequency of the AC control signal is lower than the frequency of the AC touch signal.
  • the frequency of the AC control signal is not lower than the frequency of the AC touch signal.
  • the frequency of the AC signal (AC touch signal or AC control signal) is not less than 10 KHz .
  • the waveform of the AC control signal or the waveform of the AC touch signal may be a square wave, a sine wave, or other periodic waveforms.
  • the adjacent detecting electrodes are connected to different excitation ends of the touch excitation source in the touch circuit, and the touch excitation sources are different.
  • the waveform or frequency or phase of the signal on the excitation end may be the same or different.
  • the touch control circuit has an output terminal connected to a shield electrode disposed between the sensing electrode unit array and the display panel electrode, while the active device unit is in an on state.
  • the signal applied to the shield electrode by the touch circuit is a DC signal.
  • the touch control circuit has an output terminal connected to a shield electrode disposed between the sensing electrode unit array and the display panel electrode, and the active device unit is in an on state
  • the waveform, frequency and phase of the signal applied to the shield electrode by the touch circuit are the same as those applied to the control electrode line by the touch circuit or the signal waveform, frequency and phase applied to the detection electrode line.
  • the display panel is an active liquid crystal display panel
  • the output end of the touch circuit connected to the shield electrode is connected to the display common electrode of the active liquid crystal display panel to display the common electrode.
  • a shield electrode As a shield electrode.
  • the touch circuit detects a change in the touch signal on the detecting electrode line, and measures the amplitude characteristic of charging or discharging of the connected sensing electrode unit by detecting the electrode line.
  • the touch circuit detects a change in the touch signal on the detecting electrode line, and measures a time characteristic of charging or discharging the connected sensing electrode unit by detecting the electrode line.
  • the touch circuit detects a change in a touch signal on the detecting electrode line, and measures a magnitude of a leakage current of the connected sensing electrode unit by detecting the electrode line.
  • the touch circuit detects a change in a touch signal on the detecting electrode line, and measures a phase characteristic of a leakage current of the connected sensing electrode unit by detecting the electrode line.
  • the invention provides a driving signal waveform of each electrode line in the active touch system, and a matching detecting method, which effectively realizes the point-by-point independent detection of the sensing electrode unit arranged in the array.
  • the difference between the signal between the operator touching the detecting electrode line and the touch sensing electrode unit is distinguished, and the operator may be prevented from malfunctioning when touching the detecting electrode line.
  • the signal is filtered by applying a DC shield signal to the shield electrode, or applying a shield signal having the same waveform, frequency, and phase as the drive signal on the control electrode line or the detection electrode line, thereby eliminating the display overlapping with the active touch screen. The effect of the panel on the touch signal.
  • Each sensing electrode unit on the touch screen can independently sense the touch of the touch object, realize the space digitization of the touch position detection, and make the source of the touch signal accurate to each sensing electrode unit;
  • the judging process is greatly simplified, and the resources of the post-processing chip can be saved a lot; the judgment of multi-touch is not a problem; the detection speed is made faster, the reliability is improved; according to the size of the signal of the adjacent sensing electrode unit, or According to the distribution of the sensing electrode unit area signals with the touch signals, the accuracy of the positional position of the touched position can be increased to a small position between adjacent sensing electrode units.
  • 1 is a schematic diagram of electrical connections according to a first embodiment of the present invention
  • 2 is a schematic diagram of electrical connections of two, three, four, five, and six embodiments of the present invention
  • FIG. 3 is a schematic diagram of electrical connections of a seventh embodiment of the present invention.
  • FIG. 4 is a schematic diagram of driving waveforms according to a first embodiment of the present invention.
  • FIG. 5 is a schematic diagram of driving waveforms according to a second embodiment of the present invention.
  • FIG. 6 is a schematic diagram of driving waveforms according to a third embodiment of the present invention.
  • FIG. 7 is a schematic diagram of driving waveforms according to a fourth embodiment of the present invention.
  • FIG. 8 is a schematic diagram of driving waveforms according to a fifth embodiment of the present invention.
  • FIG. 9 is a schematic diagram of driving waveforms according to a sixth embodiment of the present invention.
  • FIG. 10 is a schematic diagram of driving waveforms according to a seventh embodiment of the present invention.
  • FIG. 11 is a schematic diagram of driving waveforms of another embodiment of a seventh embodiment of the present invention.
  • Fig. 12 is a schematic view showing a driving waveform of an eighth embodiment of the present invention. detailed description
  • the active touch system 100 as shown in FIG. 1 includes a touch substrate 110, an active device array 120, a touch electrode, a touch circuit 140, and the like.
  • the three-terminal active device array 120 and the touch electrodes are disposed on the touch substrate 110.
  • the touch electrode is composed of the sensing electrode array 131 and two sets of intersecting row control electrode line groups 132 (1321, 1332, 1323, ..., 132m) and column detecting electrode line groups 133 (1331, 1332, 1333, ..., 133n)
  • the control electrode lines and the detection electrode lines are separated by an insulating layer.
  • the touch circuit 140 has a touch excitation source 141, a signal detection circuit 142, and a control circuit 143.
  • Each of the control electrode lines and the detection electrode lines of the control electrode line group 132 and the detection electrode line group 133 are respectively connected to two terminals of each active device unit of the three-terminal active device array 120; the senses of the sensing electrode array 131
  • the measuring electrode unit is connected to the other terminal of each active device unit;
  • the detecting electrode line group 133 is connected to the touch excitation source 141 and the signal detecting circuit 142 in the touch circuit 140; and the control electrode line group 132 is connected to the touch circuit 140.
  • Control circuit 143 Control circuit 143.
  • the control circuit 143 of the touch control circuit 140 outputs a DC control signal to each control electrode line of the control electrode line group 132 in a scanning manner, and connects the control electrode lines to which the DC control signal is applied.
  • the active device unit is in an on state, and the active device unit connected to the control electrode line to which the DC control signal is not applied is in an off state; the touch excitation source 141 of the touch circuit 140 simultaneously applies to each detection electrode line of the detection electrode line group 133.
  • DC touch excitation As the control circuit 143 causes the active device unit on the control electrode line to be in an on state, the DC touch signal on each detection electrode line flows into the sensing electrode line through the active device unit.
  • the signal detecting circuit 142 of the touch circuit 140 detects the change of the touch signal on each detecting electrode line or detects the change of the DC touch signal on each detecting electrode line.
  • the control circuit 143 outputs a DC control signal to each control electrode line row by row
  • the signal detection circuit 142 detects the DC touch on the sensing electrode unit connected to the control electrode line by the active device unit line by line. Control signal changes.
  • a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the active device unit is connected to the sensing electrode unit.
  • the DC touch signal on the detecting electrode line flows into the sensing electrode unit, that is, the coupling capacitor is charged; the signal detecting circuit 142 detects the change of the amplitude of the touch signal on each detecting electrode line, The detection electrode line with the largest charging current or the charging current exceeding a certain threshold can be found; the signal detecting circuit 142 detects the change of the touch signal on each detecting electrode line, or can find the charging time is the longest or the charging time exceeds a certain time.
  • the detection electrode line of the threshold according to the control electrode line of the active device unit at this time, the touched sensing electrode unit can be determined, thereby finding the position of the finger or other touch object on the touch substrate 110.
  • the active touch system 100 becomes a touch system that can detect the position of the touch point.
  • the signal detecting circuit 142 detects the change of the touch signal on the detecting electrode line 133, and may also be performed in the discharging step of the coupling capacitor to detect the magnitude of the discharging current or the length of the discharging time.
  • the signal detecting circuit 142 detects the touch signals on the plurality of detecting electrode lines at multiple times.
  • the change exceeds a certain threshold, that is, the charging current of the plurality of sensing electrode units is detected to exceed a certain threshold, thereby finding the position of the plurality of fingers on the touch substrate 110 respectively.
  • the active touch system 100 also becomes a touch system that can distinguish multiple touch points. Specific embodiment 2
  • the active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like.
  • a thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210.
  • the touch electrode is composed of a sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321). 2332, 2323, ..., 232m) and the column detecting electrode line group 233 (2331, 2332, 2333, ..., 233 ⁇ ) are formed, and each control electrode line and each detecting electrode line are separated by an insulating layer.
  • the touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
  • Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 of the touch control circuit 240; the control electrode line group 232 is connected to the control circuit 243 of the touch control circuit 240.
  • the control circuit 243 of the touch control circuit 240 outputs a DC control signal to each control electrode line of the control electrode line group 232 in a scanning manner, and the TFT unit to which the control electrode line to which the DC control signal is applied is placed.
  • the TFT unit connected to the control electrode line to which the DC control signal is not applied is in an off state; the touch excitation source 241 of the touch control circuit 240 simultaneously applies an AC touch excitation to each detection electrode line of the detection electrode line group 233.
  • the control circuit 243 causes the TFT unit on the control electrode line to be in an on state, the AC touch signal on each detection electrode line flows into the sensing electrode unit connected to the row control electrode line through the TFT unit;
  • the signal detecting circuit 242 of the touch control circuit 240 detects the change of the touch signal on each detecting electrode line column by column during the conduction state of the TFT unit connected to the control electrode line.
  • the control circuit 243 outputs a DC control signal to each control electrode line row by row
  • the signal detection circuit 242 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
  • the signal detecting circuit 242 can detect the detecting electrode line with the largest leakage current or the leakage current exceeding a certain threshold by detecting the change of the amplitude of the AC touch signal on each detecting electrode line;
  • the measuring circuit 242 detects the change of the touch signal on each detecting electrode line, and may also find the detecting electrode line whose phase change of the AC touch signal is the largest or the phase change of the AC touch signal exceeds a certain threshold;
  • the control electrode line can determine the touched sensing electrode unit to find the position of the finger or other touch object on the touch substrate 210.
  • the active touch system 200 becomes a touch system that can detect the position of the touch point.
  • the signal detecting circuit 242 detects that the touch signal changes beyond a certain threshold on a plurality of detecting electrode lines at a plurality of times, that is, detects that the charging current of the plurality of sensing electrode units exceeds a certain threshold, thereby finding out The position of the plurality of fingers on the touch substrate 210.
  • the active touch system 200 also becomes a touch system that can distinguish multiple touch points.
  • the active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like.
  • a thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210.
  • the touch electrodes are composed of the sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321, 2332, 2323, ..., 232m) and column detecting electrode line groups 233 (2331, 2332, 2333, ..., 233 ⁇ )
  • the control electrode lines and the detection electrode lines are separated by an insulating layer.
  • the touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
  • Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 of the touch control circuit 240; the control electrode line group 232 is connected to the control circuit 243 of the touch control circuit 240.
  • the control circuit 243 of the touch control circuit 240 outputs a DC control signal to each control electrode line of the control electrode line group 232 in a scanning manner, and the TFT unit to which the control electrode line to which the DC control signal is applied is placed.
  • the TFT unit connected to the control electrode line to which the DC control signal is not applied is in an off state; one output end of the touch excitation source 241 of the touch circuit 240 applies an AC touch to the odd detection electrode line of the detection electrode line group 233.
  • the other output end of the touch excitation source 241 is applied to the even detection electrode line of the detection electrode line group 233 to apply a zero potential signal.
  • the AC touch signal on the odd-numbered sensing electrode unit flows into the even-numbered sensing electrode unit through the coupling capacitance between the odd-numbered and even-numbered sensing electrode units to form a coupling current between the sensing electrode units.
  • the control circuit 243 makes the TFT unit on the control electrode line of one row in an on state, the DC touch signal on each of the odd detection electrode lines flows into the sensing electrode unit connected to the row control electrode line through the TFT unit.
  • the sensing electrode unit connected to the row control electrode line through the TFT unit and the even-numbered detecting electrode line is at a zero potential; the signal detecting circuit 242 of the touch circuit 240 is controlled in the line During the conduction state of the TFT units connected to the electrode lines, the changes of the touch signals on the lines of the odd detection electrodes are detected column by column.
  • the control circuit 243 outputs a DC control signal to each control electrode line row by row
  • the signal detection circuit 242 detects the touch signal on the odd sensing electrode unit connected to the control electrode line through the TFT unit line by line. The change.
  • the finger or other touch object When the operator's finger or other touch object approaches or touches a sensing electrode unit, the finger or other touch object changes the dielectric between the odd-numbered sensing electrode unit and the even-numbered sensing electrode unit, which changes the odd-numbered sense.
  • the coupling capacitance between the electrode unit and the even sensing electrode unit changes the coupling current between the sensing electrode units, and the AC touch signal on the detecting electrode line connected to the odd sensing electrode unit also occurs accordingly.
  • the signal detecting circuit 242 can detect the detecting electrode line whose coupling current is the largest or the coupling current exceeds a certain threshold by detecting the change of the amplitude of the AC touch signal on each of the odd detecting electrode lines; the signal detecting circuit 242 Detecting the change of the touch signal on each detection electrode line, or finding the detection electrode line whose phase change of the AC touch signal is the largest or the phase change of the AC touch signal exceeds a certain threshold; and then according to the control electrode of the TFT unit at this time Line, the touched sensing electrode unit can be determined to find the position of the finger or other touch object on the touch substrate 210. .
  • the active touch system 200 becomes a touch system that can detect the position of the touch point.
  • the signal detecting circuit 242 detects the touch signals on the plurality of detecting electrode lines at multiple times.
  • the change exceeds a certain threshold, that is, the charging current of the plurality of sensing electrode units is detected to exceed a certain threshold, thereby finding the position of the plurality of fingers on the touch substrate 210.
  • the active touch system 200 also becomes a touch system that can distinguish multiple touch points.
  • the active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like.
  • a thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210.
  • the touch electrodes are composed of the sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321, 2332, 2323, ..., 232m) and column detecting electrode line groups 233 (2331, 2332, 2333, ..., 233 ⁇ )
  • the control electrode lines and the detection electrode lines are separated by an insulating layer.
  • the touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
  • Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively
  • the detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 in the touch circuit 240.
  • the control electrode line group 232 is connected to the control circuit 243 in the touch circuit 240.
  • the control circuit 243 of the touch control circuit 240 outputs a square wave control signal to the control electrode lines of the control electrode line group 232 in a scanning manner, and the TFTs to which the control electrode lines to which the square wave control signals are applied are connected.
  • the unit is switched between the on and off states, the frequency of the square wave control signal is not less than ⁇ , and the TFT unit connected to the control electrode line to which the AC control signal is not applied is in an off state; the touch excitation source 241 of the touch circuit 240 is simultaneously directed to the detection electrode DC detection excitation is applied to each detection electrode line of the line group 233.
  • the control circuit 243 switches between the on and off states of the TFT cells on one row of control electrode lines, the DC touch signals on the respective detection electrode lines intermittently flow into the TFT control unit to be connected to the row control electrode lines.
  • a pulsed DC signal is formed on the sensing electrode unit in the sensing electrode unit; and the signal detecting circuit 242 of the touch control circuit 240 switches between the on and off states of the TFT unit connected to the control electrode line.
  • the column detects changes in the touch signals on the respective detection electrode lines.
  • the control circuit 243 outputs an AC control signal to each control electrode line row by row
  • the signal detection circuit 242 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
  • a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the pulsed DC signal on the sensing electrode unit passes through the coupling.
  • the capacitor portion leaks out, and a DC leakage current is formed on the detection electrode line connected to the sensing electrode unit; the signal detection circuit 242 can find the DC by detecting the change of the DC touch signal on each detection electrode line.
  • the active touch system 200 becomes a touch system that can detect the position of the touch point.
  • the touch excitation applied to each detection electrode line is a DC signal
  • the DC touch signal on the detection electrode line is substantially not Leaking out the coupling capacitance between the finger or other touch object and the detection electrode line; or, the DC touch signal that leaks out from the coupling capacitance between the finger or other touch object and the detection electrode line, compared to the finger or
  • the pulsed DC signal leaked out by the coupling capacitance between the other touch object and the sensing electrode unit is much smaller, and the operation misjudgment that may occur when the operator touches the detecting electrode line is avoided.
  • the active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like.
  • a thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210.
  • the touch electrodes are composed of the sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321, 2332, 2323, ..., 232m) and column detecting electrode line groups 233 (2331, 2332, 2333, ..., 233 ⁇ )
  • the control electrode lines and the detection electrode lines are separated by an insulating layer.
  • the touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
  • Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 of the touch control circuit 240; the control electrode line group 232 is connected to the control circuit 243 of the touch control circuit 240.
  • the control circuit 243 of the touch control circuit 240 outputs a sine wave AC control signal to each control electrode line of the control electrode line group 232 in a scanning manner, and connects the control electrode lines to which the sine wave AC control signal is applied.
  • the TFT unit is switched in the form of a sine wave in the on and off states, and the TFT unit connected to the control electrode line to which the AC control signal is not applied is in an off state; the touch excitation source 241 of the touch circuit 240 is simultaneously directed to the detection electrode line group.
  • Each detection electrode line of 233 applies a sine wave AC touch excitation; the frequency of the control signal is much lower than the frequency of the touch excitation signal, and the frequency of the touch excitation signal is not less than 10 KHz.
  • the control circuit 243 changes the sinusoidal switching between the on and off states of the TFT unit on one row of control electrode lines, the AC touch signal on each detection electrode line is modulated by the control signal, flows into the TFT unit and controls the line.
  • a signal in the form of a modulated carrier is formed on the sensing electrode unit in the sensing electrode unit connected to the electrode line;
  • a signal detecting circuit 242 of the touch circuit 240 is connected to the TFT unit connected to the control electrode line
  • the on and off states detect the change of the touch signal on each of the detection electrode lines column by column during the sinusoidal transformation between the on and off states.
  • the control circuit 243 outputs an AC control signal to each control electrode line row by row
  • the signal detection circuit 242 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
  • a finger or other touch A coupling capacitor is formed between the object and the sensing electrode unit, and the carrier signal on the sensing electrode unit is partially leaked through the coupling capacitor, and an alternating current leakage current is formed on the detecting electrode line connected to the sensing electrode unit;
  • the measuring circuit 242 detects the change of the AC touch signal on each detecting electrode line, and demodulates the relatively high frequency touch signal into a low frequency signal of the control signal frequency to find out that the AC leakage current is the largest or the AC leakage current exceeds a certain threshold detection electrode line; according to the control electrode line that turns on the sinusoidal transformation between the on and off states of the TFT unit at this time, the touched sensing electrode unit can be determined, thereby finding out that the finger or other touch object is touching
  • the position on the substrate 210 is controlled.
  • the active touch system 200 becomes a touch system that can detect the position of the touch point.
  • the active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like.
  • a thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210.
  • the touch electrodes are composed of the sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321, 2332, 2323, ..., 232m) and column detecting electrode line groups 233 (2331, 2332, 2333, ..., 233 ⁇ )
  • the control electrode lines and the detection electrode lines are separated by an insulating layer.
  • the touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
  • Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 of the touch control circuit 240; the control electrode line group 232 is connected to the control circuit 243 of the touch control circuit 240.
  • the control circuit 243 of the touch control circuit 240 outputs a sine wave AC control signal to each control electrode line of the control electrode line group 232 in a scanning manner, and connects the control electrode lines to which the sine wave AC control signal is applied.
  • the TFT unit is switched in the form of a sine wave in the on and off states, and the TFT unit connected to the control electrode line to which the AC control signal is not applied is in an off state; the touch excitation source 241 of the touch circuit 240 is simultaneously directed to the detection electrode line group.
  • a sine wave AC touch excitation is applied to each detection electrode line of 233; a touch excitation signal
  • the frequency is much lower than the frequency of the control signal, and the frequency of the control signal is not less than 10 kHz.
  • the control circuit 243 changes the sinusoidal switching between the on and off states of the TFT unit on the control electrode line
  • the AC touch signal on each detection electrode line is mounted on the control signal, flows into the TFT unit and controls the line.
  • a carrier signal for controlling the signal frequency is formed on the sensing electrode unit; and the signal detecting circuit 242 of the touch circuit 240 is connected to the TFT unit connected to the control electrode line.
  • the on and off states detect the change of the touch signal on each of the detection electrode lines column by column during the sinusoidal transformation between the on and off states.
  • the control circuit 243 outputs an AC control signal to each control electrode line row by row
  • the signal detection circuit 242 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
  • a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the carrier signal on the sensing electrode unit passes through the coupling capacitor. Partially leaking out, forming an alternating current leakage current on the detecting electrode line connected to the sensing electrode unit; the signal detecting circuit 242 detecting the change of the alternating touch signal on each detecting electrode line, and detecting the low frequency of the specific frequency
  • the touch signal is measured, and the relatively high frequency touch signal is demodulated into a low frequency signal of the control signal frequency, and the detection electrode line with the largest AC leakage current or the AC leakage current exceeding a certain threshold is found; and then the TFT unit is turned on according to the current
  • the sinusoidal control electrode line between the on and off states determines the touched sensing electrode unit to find the position of the finger or other touch object on the touch substrate 210.
  • the active touch system 200 becomes a touch system that can detect the position of the touch point.
  • the active touch system 300 and the display panel 301 as shown in FIG. 3 include a touch substrate 310, a thin film transistor (TFT) array 320, a touch electrode, a touch circuit 340, and the like.
  • a thin film transistor (TFT) array 320 and a touch electrode are disposed on the touch substrate 310.
  • the touch electrodes are composed of the sensing electrode array 331 and two sets of intersecting row control electrode line groups 332 (3321, 3332, 3323, ..., 332m), column detecting electrode line groups 333 (3331, 3332, 3333, ..., 333n) and
  • the shielding electrode 334 is composed of an insulating layer at the intersection of each control electrode line and each detecting electrode line.
  • the measuring electrode 333 line group and the shielding electrode 334 are both disposed on the non-touch surface of the touch substrate 210 facing away from the user.
  • the touch circuit 340 has a touch excitation source 341, a signal detection circuit 342, a control circuit 343, and a mask signal output terminal 344.
  • Each control electrode line and each detection electrode line of the control electrode line group 332 and the detection electrode line group 333 are respectively connected to the gate and the source of each TFT unit of the TFT array 320; the sensing electrode units of the sensing electrode array 331 are respectively Connecting the drains of the TFT units; the detecting electrode group 333 is connected to the touch excitation source 341 and the signal detecting circuit 342 in the touch circuit 340; the control electrode group 332 is connected to the control circuit 343 in the touch circuit 340, and the shielding electrode 334 connects the masked signal output 344 in touch circuit 340.
  • the control circuit 343 of the touch control circuit 340 outputs a square wave control signal to the control electrode lines of the control electrode line group 332 in a scanning manner, and the TFTs to which the control electrode lines to which the square wave control signals are applied are connected.
  • the unit is switched between the on and off states, and the TFT unit connected to the control electrode line to which the AC control signal is not applied is in an off state;
  • the touch excitation source 341 of the touch control circuit 340 simultaneously applies to each detection electrode line of the detection electrode line group 333.
  • the DC touch excitation; the shield signal output terminal 344 of the touch circuit 340 applies a DC shield signal to the shield electrode 334.
  • the control circuit 343 switches between the on and off states of the TFT cells on one row of control electrode lines, the DC touch signals on the respective detection electrode lines intermittently flow into the TFT control unit through the TFT unit.
  • a pulsed DC signal is formed on the sensing electrode unit; and the signal detecting circuit 342 of the touch control circuit 340 is switched between the on and off states of the TFT unit connected to the control electrode line.
  • the column detects changes in the touch signals on the respective detection electrode lines.
  • the control circuit 343 outputs an AC control signal to each control electrode line row by row
  • the signal detection circuit 342 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
  • a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the pulsed DC signal on the sensing electrode unit passes through the coupling.
  • the capacitor portion leaks out, and a DC leakage current is formed on the detection electrode line connected to the sensing electrode unit; the signal detection circuit 342 can find the DC by detecting the change of the DC touch signal on each detection electrode line.
  • the active touch system 300 becomes a touch system that can detect the position of the touch point.
  • Applying a DC shielding signal to the shielding electrode 334 causes the pulsed DC signal on the sensing electrode unit to leak out through the coupling capacitance portion between the sensing electrode unit and the shielding electrode 334, so that the detecting electrode line is stored.
  • the shield electrode 334 which has a DC leakage current in the background but is applied with a DC shield signal, isolates the influence of the display signal on the display panel 301 on the touch signal.
  • shielding electrode 334 which is the same as the control signal waveform, frequency and phase.
  • the pulse DC signal on the sensing electrode unit is also the same as the control signal waveform, frequency and phase, on the shielding electrode 334.
  • the shielding signal is the same as the signal waveform, frequency and phase on the sensing electrode unit; the pulse DC signal on the sensing electrode unit can be reduced as much as possible, and the coupling capacitance between the sensing electrode unit and the shielding electrode 334 is leaked simultaneously.
  • the shielding electrode 334 can in turn isolate the influence of the display signal on the display panel 301 on the touch signal.
  • the active touch system 300 and the display panel 301 as shown in FIG. 3 include a touch substrate 310, a thin film transistor (TFT) array 320, a touch electrode, a touch circuit 340, and the like.
  • a thin film transistor (TFT) array 320 and a touch electrode are disposed on the touch substrate 310.
  • the touch electrodes are composed of the sensing electrode array 331 and two sets of intersecting row control electrode line groups 332 (3321, 3332, 3323, ..., 332m), column detecting electrode line groups 333 (3331, 3332, 3333, ..., 333n) and
  • the shielding electrode 334 is composed of an insulating layer at the intersection of each control electrode line and each detecting electrode line.
  • the touch circuit 340 has a touch excitation source 341, a signal detection circuit 342, a control circuit 343, and a mask signal output terminal 344.
  • Each control electrode line and each detection electrode line of the control electrode line group 332 and the detection electrode line group 333 are respectively connected to the gate and the source of each TFT unit of the TFT array 320; the sensing electrode units of the sensing electrode array 331 are respectively Connecting the drain of each TFT unit; the detecting electrode group 333 is connected to the touch excitation source 341 and the signal detecting circuit 342 in the touch circuit 340; the control electrode line group 332 is connected to the control circuit 343 in the touch circuit 340, and the shielding electrode 334 connects the masked signal output 344 in touch circuit 340.
  • the control circuit 343 of the touch control circuit 340 outputs a DC control signal to each control electrode line of the control electrode line group 332 in a scanning manner, and the TFT unit to which the control electrode line to which the DC control signal is applied is placed.
  • the TFT unit connected to the control electrode line to which the DC control signal is not applied is in an off state; the touch excitation source 341 of the touch control circuit 340 simultaneously goes to the detection electrode line of the detection electrode line group 333.
  • the shield signal output terminal 344 of the touch circuit 340 applies an AC shield signal to the shield electrode 334, and the waveform, frequency and phase of the AC shield signal and the waveform and frequency of the touch signal applied to the detection electrode group 333 Same as phase.
  • the control circuit 343 turns on the TFT unit on the control electrode line
  • the AC touch signal on each detection electrode line flows into the sensing electrode unit connected to the row control electrode line through the TFT unit;
  • the signal detecting circuit 342 of the touch control circuit 340 detects the change of the touch signal on each of the detecting electrode lines column by column during the conduction state of the TFT unit connected to the control electrode line.
  • the control circuit 343 outputs a DC control signal to each control electrode line row by row
  • the signal detection circuit 342 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
  • the signal detecting circuit 342 can detect the change of the AC touch signal on each detecting electrode line, and can find the detecting electrode line with the largest leakage current or the leakage current exceeding a certain threshold; the signal detecting circuit 342 detecting the change of the touch signal on each detection electrode line, or finding the detection electrode line whose phase change of the AC touch signal is the largest or the phase change of the AC touch signal exceeds a certain threshold; and then controlling the TFT unit according to the current time
  • the electrode line can determine the touched sensing electrode unit to find the position of the finger or other touch object on the touch substrate 310.
  • the active touch system 300 becomes a touch system that can detect the position of the touch point.
  • the shielding electrode 334 is applied with the same waveform, frequency and phase of the AC touch signal on the detecting electrode group, and the shielding signal on the shielding electrode 334 is the same as the signal waveform, frequency and phase on the sensing electrode unit;
  • the AC touch signal on the sensing electrode unit is reduced, and the coupling capacitance between the sensing electrode unit and the shielding electrode 334 is leaked, and the shielding electrode 334 can isolate the influence of the display signal on the display panel 301 on the touch signal.

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Abstract

The present invention is a drive method for active touch control, relating to a touch control screen, and particularly to an active touch control screen and a drive method thereof. The present invention reveals a drive method for an active touch control system, and proposes a drive signal waveform for each electrode line in the active touch control system and a coordinated detection method, which effectively realizes point-by-point independent detection of sensing electrode units configured in an array. The cooperation of drive signal waveforms on the control electrode line and the detection electrode line is used to distinguish the difference between signals of an operator touching the detection electrode line and touching the detection electrode unit, which avoids a signal which may generate an error action when the operator touches the detection electrode line; and the influence of the display panel used with the active touch control screen in an overlapped way on the touch control signal is eliminated by applying a shielding signal to the shielding electrode.

Description

一种有源触控系统的驱动方法 技术领域  Driving method of active touch system
本发明涉及触控屏， 尤其涉及有源触控屏及其驱动方法。 背景技术  The present invention relates to a touch screen, and more particularly to an active touch screen and a driving method thereof. Background technique
触摸是人类最重要的感知方式，是人与机器进行互动的最自然的方式。触控屏发 说  Touch is the most important way of human perception, the most natural way for people to interact with machines. Touch screen
展至今已广泛用于个人计算机、 智能电话、 公共信息、 智能家电、 工业控制等众多 领域。 在目前的触控领域， 主要有电阻式触控屏、 光电式触控屏、 超声波式触控屏、 书 It has been widely used in many fields such as personal computers, smart phones, public information, smart home appliances, industrial control, and so on. In the current touch field, there are mainly resistive touch screens, photoelectric touch screens, ultrasonic touch screens, and books.
平面电容式触控屏， 近年来投射电容式触控屏发展迅速。 Planar capacitive touch screens, in recent years, projected capacitive touch screens have developed rapidly.
电阻式触控屏仍是目前市场上的主导产品，但电阻式触控屏的双层基板的结构， 使得触控屏和显示面板层叠在一起使用时， 触控屏的反光非常影响显示的亮度、 对 比度、 色饱和度等显示品质， 使整个显示质量大大下降， 而加大显示面板背光的亮 度， 还会使功耗大涨； 模拟式电阻触控屏还存在定位漂移的问题， 不时要进行位置 校准； 另外， 电阻式触控屏电极接触的工作方式， 又使得触控屏的寿命较短。  Resistive touch screen is still the leading product on the market, but the structure of the two-layer substrate of the resistive touch screen makes the reflection of the touch screen greatly affect the brightness of the display when the touch screen and the display panel are stacked together. Display quality such as contrast, color saturation, etc., greatly degrades the overall display quality, and increases the brightness of the backlight of the display panel, which also causes the power consumption to rise; the analog resistive touch screen also has the problem of positioning drift, from time to time. Position calibration; In addition, the working mode of the resistive touch screen electrode makes the life of the touch screen shorter.
红外线式触控屏和超声波式触控屏不会影响显示质量。 但红外线式触控屏和超 声波式触控屏成本高， 水滴和尘埃都会影响触控屏工作的可靠性， 特别是红外线式 触控屏和超声波式触控屏机构复杂、 功耗大， 使得红外线式触控屏和超声波式触控 屏基本无法应用在便携式产品上。  Infrared touch screens and ultrasonic touch screens do not affect display quality. However, the infrared touch screen and the ultrasonic touch screen are costly, and water droplets and dust can affect the reliability of the touch screen operation, especially the infrared touch screen and the ultrasonic touch screen mechanism are complicated, and the power consumption is large, so that the infrared Touch screens and ultrasonic touch screens are basically not available on portable products.
平面电容式触控屏的单层基板的结构， 使得触控屏和显示面板层叠在一起使用 时， 触控屏对显示质量的影响不大。 但平面电容式触控屏也存在定位漂移的问题， 不时要进行位置校准； 水滴也会影响触控屏工作的可靠性； 特别是平面电容式触控 屏功耗大、 成本高， 也让平面电容式触控屏基本无法应用在便携式产品上。  The structure of the single-layer substrate of the flat capacitive touch screen makes the touch screen have little effect on the display quality when the touch screen and the display panel are stacked together. However, the planar capacitive touch screen also has the problem of positioning drift. Position calibration is performed from time to time. Water droplets also affect the reliability of the touch screen operation; especially the planar capacitive touch screen consumes a lot of power and costs, and also makes the plane Capacitive touch screens are basically not available on portable products.
投射电容式触控屏仍然可以是单层基板结构， 也使得触控屏和显示面板层叠在 一起使用时， 触控屏对显示质量的影响不大。 但投射电容式触控屏是通过测量手指 或其他触控物对触控屏电极间耦合电容的影响， 实际是通过测量手指或其他触控物 对触控屏电极充放电的影响， 来探测手指或其他触控物在触控屏上的位置。 定位点 需要经过模拟计算， 而非真正的数字式触控屏。 制造和使用环境中的分布电容都会 影响触控屏工作的可靠性， 显示驱动信号及其他电信号的干扰都会影响触控屏的工 作， 水滴也会影响触控屏工作的可靠性； 另外， 投射电容式触控屏对探测电极线的 电阻值方面有较高要求， 往往需要有金属类的高电导率电极层， 制做工艺复杂、 成 本高， 特别是在大尺寸、 超大尺寸触控屏方面成本过高。 The projected capacitive touch screen can still be a single-layer substrate structure, and when the touch screen and the display panel are stacked together, the touch screen has little effect on the display quality. However, the projected capacitive touch screen measures the influence of the finger or other touch object on the coupling capacitance between the electrodes of the touch screen. Actually, the finger is detected by measuring the influence of the finger or other touch object on the charging and discharging of the touch screen electrode. Or the location of other touch objects on the touch screen. The anchor point needs to be simulated, not a real digital touch screen. Distributed capacitance in both manufacturing and use environments Affect the reliability of the touch screen operation, the display drive signal and other electrical signal interference will affect the work of the touch screen, water droplets will also affect the reliability of the touch screen operation; In addition, the projected capacitive touch screen pairs the detection electrode line There are high requirements on the resistance value, and a high-conductivity electrode layer of a metal type is often required, and the manufacturing process is complicated and costly, especially in the case of a large-sized, ultra-large-size touch screen.
随着近年来 iPhone手机和 Windows 7操作系统的推出， 人们对多点触控的兴趣 骤然提升。 无论是电阻式还是电容式触控屏， 由于屏幕上每一感测线直接连接多个 感测单元， 各感测单元之间并不完全独立。 为了能够分辨多个触控点， 相对单点触 控来说， 要么检测的扫描方式变得十分复杂， 检测要花费大量时间和功耗； 要么检 测后的判断程序变得十分复杂， 需要强大的计算能力和存储空间， 也要花费大量时 间和功耗。  With the launch of the iPhone and Windows 7 operating systems in recent years, people's interest in multi-touch has suddenly increased. Whether it is a resistive or capacitive touch screen, since each sensing line on the screen is directly connected to multiple sensing units, the sensing units are not completely independent. In order to be able to distinguish multiple touch points, the scanning mode of the detection becomes very complicated compared to the single touch, and the detection takes a lot of time and power consumption; or the detection process after the detection becomes very complicated and requires a strong Computational power and storage space also take a lot of time and power.
中国专利 ZL2010202966254提出了一种有源触控系统， 通过触控屏上所设置的 有源器件单元阵列， 将触控屏上阵列排布的感测电极单元隔离开来， 以使各个感测 单元可以完全独立地感测触控物所引起的电容的变化， 让多点触控变得轻松自然。 发明内容  Chinese patent ZL2010202966254 proposes an active touch system, which isolates the sensing electrode units arranged on the array on the touch screen through the active device unit array provided on the touch screen, so that the sensing units are respectively It can completely sense the change of capacitance caused by the touch object, making multi-touch easy and natural. Summary of the invention
本发明就是为了提供一种有源触控系统的驱动方法， 对有源触控屏各电极线有 效地实施触控激励信号的施加， 实现对阵列排布的感测电极单元的逐点独立侦测。  The present invention is to provide a driving method for an active touch system, and effectively implements application of a touch excitation signal to each electrode line of an active touch screen, thereby realizing point-by-point independent detection of the sensing electrode unit arranged in the array. Measurement.
本发明的有源触控系统的基本工作原理是：  The basic working principle of the active touch system of the present invention is:
在触控基板上阵列状地设置感测电极单元和有源器件单元， 以及两组相交的控 制电极线和检测电极线， 检测电极线通过有源器件单元连接感测电极单元。 用控制 电极线来控制有源器件单元的通断， 用检测电极线来向感测电极单元施加触控激励 信号， 并侦测感测电极与触控物之间的电容性耦合。  The sensing electrode unit and the active device unit are arranged in an array on the touch substrate, and two sets of intersecting control electrode lines and detection electrode lines are connected, and the detecting electrode lines are connected to the sensing electrode unit through the active device unit. The control electrode line is used to control the on and off of the active device unit, the detection electrode line is used to apply the touch excitation signal to the sensing electrode unit, and the capacitive coupling between the sensing electrode and the touch object is detected.
当人的手指或其他触控物靠近或接触某感测电极单元时， 手指或其他触控物与 感测电极单元间形成耦合电容， 感测电极单元上的触控激励信号就会通过此耦合电 容部分泄漏出去， 或通过此耦合电容泄漏到触控屏上的其他电极。 触控电路通过检 测各条向感测电极单元提供触控激励信号的检测电极线上触控信号变化的大小， 找 出漏电流最大的或漏电流超过某阈值的检测电极线， 再结合此时开启有源器件的控 制电极线， 来确定产生漏电流的感测电极单元， 从而找出手指或其他触控物在触控 基板上的位置。  When a human finger or other touch object approaches or contacts a sensing electrode unit, a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the touch excitation signal on the sensing electrode unit passes through the coupling. The capacitor portion leaks out or leaks through the coupling capacitor to other electrodes on the touch screen. The touch circuit detects the change of the touch signal on the detection electrode line of the touch excitation signal by detecting each strip to the sensing electrode unit, and finds the detection electrode line with the largest leakage current or the leakage current exceeding a certain threshold value, and then combines the current The control electrode line of the active device is turned on to determine the sensing electrode unit that generates the leakage current, thereby finding the position of the finger or other touch object on the touch substrate.
薄膜场效应晶体管即 TFT (Thin Fi lm Transistor)是有源矩阵器件的典型代表， 薄膜晶体管 TFT栅极 (Gate)连接至水平方向扫描线， 源极 (Source)连接至垂直方向 的数据线， 漏极 (Drain)则连接至负载电极 (这里的漏极、 源极的定义只是习惯性定 义， 源极电平并不专指源极电极的电平， 而是这里说的源极和漏极两电极中电平较 小的那个电平）。阵列排布的有源器件阵列让每个负载电极均配置一个半导体开关器 件， 可以通过脉冲进行选通， 因而每个负载电极相对独立。 Thin film field effect transistor (TFT) is a typical representative of active matrix devices. The thin film transistor TFT gate is connected to the horizontal scanning line, the source is connected to the vertical data line, and the drain is connected to the load electrode (the drain and source definitions here are just custom Sexual definition, the source level does not refer specifically to the level of the source electrode, but to the level of the lower of the source and drain electrodes. The array of active devices arranged in the array allows each load electrode to be equipped with a semiconductor switching device that can be gated by pulses so that each load electrode is relatively independent.
薄膜场效应晶体管 (TFT)有 NM0S型和 PM0S型两种。目前绝大部分的 TFT是采用 非晶硅（amorphous silicon, a_Si)制程， 其栅极绝缘层是氮化硅（SiNx)， 容易攫取 正电荷， 要在非晶硅半导体层中形成沟道， 恰好利用氮化硅中的正电荷来帮助吸引 电子以形成沟道， 因此使用非晶硅制程的 TFT多为丽 OS型。本说明书的内容主要是 以丽 OS型薄膜晶体管为代表进行阐述， PM0S型薄膜晶体管可遵循相同的原理， 不 再单独列举表述。  Thin film field effect transistors (TFTs) are available in NM0S and PM0S types. At present, most of the TFTs use an amorphous silicon (a_Si) process, and the gate insulating layer is silicon nitride (SiNx), which is easy to draw a positive charge, and a channel is formed in the amorphous silicon semiconductor layer. The positive charge in silicon nitride is used to help attract electrons to form a channel, so TFTs using amorphous silicon processes are mostly of the OS type. The contents of this manual are mainly described by the MN OS thin film transistor. The PM0S thin film transistor can follow the same principle and will not be listed separately.
本发明的技术问题通过以下的技术方案予以解决：  The technical problem of the present invention is solved by the following technical solutions:
一种有源触控系统的驱动方法， 有源触控系统由有源触控面板和触控电路等组 成， 有源触控面板的基板上具有阵列排布的有源器件单元、 阵列排布的感测电极单 元、 以及不少于两组相交的控制电极线和检测电极线， 各控制电极线和各检测电极 线相交处有绝缘层相隔离； 触控电路具有触控激励源、 信号检测电路和控制电路； 有源触控面板上的感测电极单元连接有源器件，有源器件连接控制电极和检测电极， 检测电极连接触控电路中的触控激励源和信号检测电路， 控制电极连接触控电路中 的控制电路； 触控电路以扫描方式向各控制电极线施加控制信号， 控制有源器件单 元的导通状态， 并通过侦测检测电极线上触控信号的变化， 来确定触控点的位置； 所述触控电路向控制电极线所施加的控制信号是直流信号， 触控电路在向某一条或 多条控制电极线施加控制信号时，还通过检测电极线向感测电极单元施加触控信号， 并侦测检测电极线上触控信号的变化， 来确定感测电极单元是否被触控。  An active touch system is composed of an active touch panel and a touch circuit. The active touch panel has an array of active device units and arrays arranged on the substrate. The sensing electrode unit and the control electrode line and the detecting electrode line intersecting at least two groups, the control electrode lines and the detecting electrode lines are separated by an insulating layer; the touch circuit has a touch excitation source and signal detection a circuit and a control circuit; a sensing electrode unit on the active touch panel is connected to the active device, the active device is connected to the control electrode and the detecting electrode, and the detecting electrode is connected to the touch excitation source and the signal detecting circuit in the touch circuit, and the control electrode Connecting the control circuit in the touch circuit; the touch circuit applies a control signal to each control electrode line in a scanning manner, controls the conduction state of the active device unit, and determines the change of the touch signal on the detection electrode line to determine The position of the touch point; the control signal applied by the touch circuit to the control electrode line is a DC signal, and the touch circuit is controlled to one or more When the control signal is applied to the electrode line, the touch signal is applied to the sensing electrode unit through the detecting electrode line, and the change of the touch signal on the detecting electrode line is detected to determine whether the sensing electrode unit is touched.
另一种技术方案是： 一种有源触控系统的驱动方法， 有源触控系统由有源触控 面板和触控电路等组成， 有源触控面板的基板上具有阵列排布的有源器件单元、 阵 列排布的感测电极单元、 以及不少于两组相交的控制电极线和检测电极线， 各控制 电极线和各检测电极线相交处有绝缘层相隔离； 触控电路具有触控激励源、 信号检 测电路和控制电路； 有源触控面板上的感测电极单元连接有源器件， 有源器件连接 控制电极和检测电极， 检测电极连接触控电路中的触控激励源和信号检测电路， 控 制电极连接触控电路中的控制电路； 触控电路以扫描方式向各控制电极线施加控制 信号， 控制有源器件单元的导通状态， 并通过侦测检测电极线上触控信号的变化， 来确定触控点的位置； 所述触控电路向控制电极线所施加的控制信号是交流信号， 触控电路在向某一条或多条控制电极线施加控制信号时， 还通过检测电极线向感测 电极单元施加触控信号， 并侦测检测电极线上触控信号的变化， 来确定感测电极单 元是否被触控。 Another technical solution is: an active touch system driving method, the active touch system is composed of an active touch panel and a touch circuit, and the active touch panel has an array arranged on the substrate. a source device unit, a sensing electrode unit arranged in the array, and not less than two sets of intersecting control electrode lines and detecting electrode lines, wherein the control electrode lines and the detecting electrode lines are separated by an insulating layer; the touch circuit has a touch excitation source, a signal detection circuit and a control circuit; a sensing electrode unit on the active touch panel is connected to the active device, the active device is connected to the control electrode and the detection electrode, and the detection electrode is connected to the touch excitation source in the touch circuit And a signal detecting circuit, the control electrode is connected to the control circuit in the touch circuit; the touch circuit applies a control to each control electrode line in a scanning manner a signal, controlling an on state of the active device unit, and determining a position of the touch point by detecting a change of the touch signal on the detection electrode line; and the control signal applied by the touch circuit to the control electrode line is an alternating current The signal, when the control circuit applies a control signal to the one or more control electrode lines, and also applies a touch signal to the sensing electrode unit through the detecting electrode line, and detects a change of the touch signal on the detecting electrode line to determine Sensing whether the electrode unit is touched.
本发明的技术问题通过以下的技术方案进一步予以解决：  The technical problem of the present invention is further solved by the following technical solutions:
根据本发明的另一个具体方面， 所述触控信号是直流信号， 触控电路通过侦测 施加在检测电极线上的直流触控信号的变化， 来确定感测电极单元是否被触控。  According to another specific aspect of the present invention, the touch signal is a DC signal, and the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the DC touch signal applied to the detecting electrode line.
根据本发明的另一个具体方面， 所述触控信号是交流信号， 触控电路通过侦测 施加在检测电极线上的交流触控信号的变化， 来确定感测电极单元是否被触控。  According to another specific aspect of the present invention, the touch signal is an AC signal, and the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the AC touch signal applied to the detecting electrode line.
根据本发明的另一个具体方面， 所述触控信号是直流信号， 触控电路通过侦测 施加在检测电极线上的直流触控信号的变化， 来确定感测电极单元是否被触控。  According to another specific aspect of the present invention, the touch signal is a DC signal, and the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the DC touch signal applied to the detecting electrode line.
根据本发明的另一个具体方面， 所述触控信号是交流信号， 触控电路通过侦测 施加在检测电极线上的交流触控信号的变化， 来确定感测电极单元是否被触控。  According to another specific aspect of the present invention, the touch signal is an AC signal, and the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the AC touch signal applied to the detecting electrode line.
根据本发明的另一个具体方面 ， 所述交流控制信号的频率， 低于所述交流触控 信号的频率。  According to another specific aspect of the invention, the frequency of the AC control signal is lower than the frequency of the AC touch signal.
根据本发明的另一个具体方面 ， 所述交流控制信号的频率， 不低于所述交流触 控信号的频率。  According to another specific aspect of the invention, the frequency of the AC control signal is not lower than the frequency of the AC touch signal.
根据本发明的另一个具体方面 ， 所述交流信号（交流触控信号或交流控制信号） 的频率不小于 10KHz。 According to another specific aspect of the present invention, the frequency of the AC signal (AC touch signal or AC control signal) is not less than 10 KHz .
根据本发明的另一个具体方面 ， 所述交流控制信号的波形或交流触控信号的波 形， 可以是方波， 也可以是正弦波， 也可以是其他周期性的波形。  According to another specific aspect of the present invention, the waveform of the AC control signal or the waveform of the AC touch signal may be a square wave, a sine wave, or other periodic waveforms.
根据本发明的另一个具体方面 ， 所述有源触控系统的检测电极线组中， 具有相 邻检测电极连接触控电路中触控激励源的不同激励端， 所述触控激励源的不同激励 端上信号的波形或频率或相位， 可以是相同的， 也可以是不同的。  According to another specific aspect of the present invention, in the detecting electrode line group of the active touch system, the adjacent detecting electrodes are connected to different excitation ends of the touch excitation source in the touch circuit, and the touch excitation sources are different. The waveform or frequency or phase of the signal on the excitation end may be the same or different.
根据本发明的另一个具体方面， 所述触控电路具有连接设置在感测电极单元阵 列和显示面板电极之间的屏蔽电极的输出端， 在所述有源器件单元处于导通态的期 间， 有触控电路施加给屏蔽电极的信号是直流信号。  According to another specific aspect of the present invention, the touch control circuit has an output terminal connected to a shield electrode disposed between the sensing electrode unit array and the display panel electrode, while the active device unit is in an on state. The signal applied to the shield electrode by the touch circuit is a DC signal.
根据本发明的另一个具体方面， 所述触控电路具有连接设置在感测电极单元阵 列和显示面板电极之间的屏蔽电极的输出端， 在所述有源器件单元处于导通态的期 间， 触控电路施加给屏蔽电极的信号波形、 频率和相位， 与触控电路施加在控制电 极线上的， 或与施加在检测电极线上的信号波形、 频率和相位是相同的。 According to another specific aspect of the present invention, the touch control circuit has an output terminal connected to a shield electrode disposed between the sensing electrode unit array and the display panel electrode, and the active device unit is in an on state The waveform, frequency and phase of the signal applied to the shield electrode by the touch circuit are the same as those applied to the control electrode line by the touch circuit or the signal waveform, frequency and phase applied to the detection electrode line.
根据本发明的另一个具体方面， 所述显示面板是有源液晶显示面板， 所述触控 电路连接屏蔽电极的输出端， 是连接到有源液晶显示面板的显示公共电极上， 以显 示公共电极作为屏蔽电极。  According to another specific aspect of the present invention, the display panel is an active liquid crystal display panel, and the output end of the touch circuit connected to the shield electrode is connected to the display common electrode of the active liquid crystal display panel to display the common electrode. As a shield electrode.
根据本发明的另一个具体方面， 所述触控电路侦测检测电极线上触控信号的变 化， 是通过检测电极线测量其所连接感测电极单元充电或放电的幅值特征。  According to another specific aspect of the present invention, the touch circuit detects a change in the touch signal on the detecting electrode line, and measures the amplitude characteristic of charging or discharging of the connected sensing electrode unit by detecting the electrode line.
根据本发明的另一个具体方面， 所述触控电路侦测检测电极线上触控信号的变 化， 是通过检测电极线测量其所连接感测电极单元充电或放电的时间特征。  According to another specific aspect of the present invention, the touch circuit detects a change in the touch signal on the detecting electrode line, and measures a time characteristic of charging or discharging the connected sensing electrode unit by detecting the electrode line.
根据本发明的另一个具体方面， 所述触控电路侦测检测电极线上触控信号的变 化， 是通过检测电极线测量其所连接感测电极单元漏电流的幅值特征。  According to another specific aspect of the present invention, the touch circuit detects a change in a touch signal on the detecting electrode line, and measures a magnitude of a leakage current of the connected sensing electrode unit by detecting the electrode line.
根据本发明的另一个具体方面， 所述触控电路侦测检测电极线上触控信号的变 化， 是通过检测电极线测量其所连接感测电极单元漏电流的相位特征。  According to another specific aspect of the present invention, the touch circuit detects a change in a touch signal on the detecting electrode line, and measures a phase characteristic of a leakage current of the connected sensing electrode unit by detecting the electrode line.
本发明的有益效果是：  The beneficial effects of the invention are:
本发明提出了有源触控系统中各电极线的驱动信号波形， 以及相配合的侦测方 法， 有效地实现对阵列排布的感测电极单元的逐点独立侦测。 利用控制电极线上和 检测电极线上驱动信号波形的配合， 来区分操作者触碰检测电极线与触碰感测电极 单元间信号的差别， 避免操作者触碰检测电极线时可能产生误动作的信号； 通过对 屏蔽电极施加直流的的屏蔽信号， 或施加与控制电极线上或检测电极线上驱动信号 相同波形、 频率和相位的屏蔽信号， 来排除与有源触控屏重叠使用的显示面板对触 控信号的影响。  The invention provides a driving signal waveform of each electrode line in the active touch system, and a matching detecting method, which effectively realizes the point-by-point independent detection of the sensing electrode unit arranged in the array. By using the cooperation of the driving signal waveform on the control electrode line and the detecting electrode line, the difference between the signal between the operator touching the detecting electrode line and the touch sensing electrode unit is distinguished, and the operator may be prevented from malfunctioning when touching the detecting electrode line. The signal is filtered by applying a DC shield signal to the shield electrode, or applying a shield signal having the same waveform, frequency, and phase as the drive signal on the control electrode line or the detection electrode line, thereby eliminating the display overlapping with the active touch screen. The effect of the panel on the touch signal.
触控屏上各个感测电极单元能够完全各自独立地感测触控物的触控， 实现触控 位置侦测的空间数字化， 让触控信号的来源准确到每一感测电极单元； 让后续判断 程序大大简化， 可以大量节省后处理芯片的资源； 让多点触控的判断变得不成问题; 让探测速度变得更快， 可靠性提高； 根据相邻感测电极单元信号的大小， 或根据有 触控信号的感测电极单元区域信号的分布， 被触位置定位的准确性可提高到相邻感 测电极单元间的细小位置。 附图说明  Each sensing electrode unit on the touch screen can independently sense the touch of the touch object, realize the space digitization of the touch position detection, and make the source of the touch signal accurate to each sensing electrode unit; The judging process is greatly simplified, and the resources of the post-processing chip can be saved a lot; the judgment of multi-touch is not a problem; the detection speed is made faster, the reliability is improved; according to the size of the signal of the adjacent sensing electrode unit, or According to the distribution of the sensing electrode unit area signals with the touch signals, the accuracy of the positional position of the touched position can be increased to a small position between adjacent sensing electrode units. DRAWINGS
图 1是本发明具体实施方式一的电气连接示意图; 图 2是本发明具体实施方式二、 三、 四、 五、 六的电气连接示意图; 1 is a schematic diagram of electrical connections according to a first embodiment of the present invention; 2 is a schematic diagram of electrical connections of two, three, four, five, and six embodiments of the present invention;
图 3是本发明具体实施方式七、 八的电气连接示意图；  3 is a schematic diagram of electrical connections of a seventh embodiment of the present invention;
图 4是本发明具体实施方式一的驱动波形示意图；  4 is a schematic diagram of driving waveforms according to a first embodiment of the present invention;
图 5是本发明具体实施方式二的驱动波形示意图；  5 is a schematic diagram of driving waveforms according to a second embodiment of the present invention;
图 6是本发明具体实施方式三的驱动波形示意图；  6 is a schematic diagram of driving waveforms according to a third embodiment of the present invention;
图 7是本发明具体实施方式四的驱动波形示意图；  7 is a schematic diagram of driving waveforms according to a fourth embodiment of the present invention;
图 8是本发明具体实施方式五的驱动波形示意图；  8 is a schematic diagram of driving waveforms according to a fifth embodiment of the present invention;
图 9是本发明具体实施方式六的驱动波形示意图；  9 is a schematic diagram of driving waveforms according to a sixth embodiment of the present invention;
图 10是本发明具体实施方式七的驱动波形示意图；  10 is a schematic diagram of driving waveforms according to a seventh embodiment of the present invention;
图 11是本发明具体实施方式七另一方案的驱动波形示意图；  11 is a schematic diagram of driving waveforms of another embodiment of a seventh embodiment of the present invention;
图 12是本发明具体实施方式八的驱动波形示意图。 具体实施方式  Fig. 12 is a schematic view showing a driving waveform of an eighth embodiment of the present invention. detailed description
具体实施方式一 Specific embodiment 1
如图 1所示的有源触控系统 100， 包括触控基板 110、 有源器件阵列 120、 触控 电极、触控电路 140等。三端有源器件阵列 120和触控电极设置在触控基板 110上。 触控电极由感测电极阵列 131 以及两组相交的行控制电极线组 132 (1321、 1332、 1323、 …、 132m)和列检测电极线组 133 (1331、 1332、 1333、 …、 133η)组成， 各控 制电极线和各检测电极线相交处有绝缘层相隔离。 触控基板 110是透明基板， 感测 电极阵列 131的各感测电极单元 〔（132i, 133j) ; i=l, 2, ···, m; j=l, 2,…， n; 其中 m 和 n是自然数〕 是透明 ITO电极， 感测电极阵列 131、 行控制电极线组 132和列检 测电极线组 133都设置在触控基板 110背向使用者的非触摸面上。 触控电路 140具 有触控激励源 141、 信号侦测电路 142和控制电路 143。 The active touch system 100 as shown in FIG. 1 includes a touch substrate 110, an active device array 120, a touch electrode, a touch circuit 140, and the like. The three-terminal active device array 120 and the touch electrodes are disposed on the touch substrate 110. The touch electrode is composed of the sensing electrode array 131 and two sets of intersecting row control electrode line groups 132 (1321, 1332, 1323, ..., 132m) and column detecting electrode line groups 133 (1331, 1332, 1333, ..., 133n) The control electrode lines and the detection electrode lines are separated by an insulating layer. The touch substrate 110 is a transparent substrate, and each sensing electrode unit of the sensing electrode array 131 [(132i, 133j); i=l, 2, ···, m ; j=l, 2,..., n; And n is a natural number] is a transparent ITO electrode, and the sensing electrode array 131, the row control electrode line group 132, and the column detecting electrode line group 133 are all disposed on the non-touch surface of the touch substrate 110 facing away from the user. The touch circuit 140 has a touch excitation source 141, a signal detection circuit 142, and a control circuit 143.
控制电极线组 132和检测电极线组 133的各控制电极线和各检测电极线， 分别 连接三端有源器件阵列 120的各有源器件单元的两个端子； 感测电极阵列 131的各 感测电极单元分别连接各有源器件单元的另一端子； 检测电极线组 133连接触控电 路 140中的触控激励源 141和信号侦测电路 142; 控制电极线组 132连接触控电路 140中的控制电路 143。  Each of the control electrode lines and the detection electrode lines of the control electrode line group 132 and the detection electrode line group 133 are respectively connected to two terminals of each active device unit of the three-terminal active device array 120; the senses of the sensing electrode array 131 The measuring electrode unit is connected to the other terminal of each active device unit; the detecting electrode line group 133 is connected to the touch excitation source 141 and the signal detecting circuit 142 in the touch circuit 140; and the control electrode line group 132 is connected to the touch circuit 140. Control circuit 143.
如图 4所示， 触控电路 140的控制电路 143以扫描方式， 逐行向控制电极线组 132 各控制电极线输出直流控制信号， 让施加有直流控制信号的控制电极线相连的 有源器件单元处于导通状态， 未施加直流控制信号的控制电极线相连的有源器件单 元处于截止状态； 触控电路 140的触控激励源 141同时向检测电极线组 133各检测 电极线施加直流触控激励。 随着控制电路 143每让一行控制电极线上的有源器件单 元处于导通状态， 各检测电极线上的直流触控信号就通过有源器件单元流入与该行 控制电极线相连接的感测电极单元内； 触控电路 140的信号侦测电路 142， 或同时 侦测各条检测电极线上触控信号的变化， 或逐列侦测各条检测电极线上直流触控信 号的变化。 这样随着控制电路 143逐行向各控制电极线输出直流控制信号， 信号侦 测电路 142就逐行的侦测通过有源器件单元与此行控制电极线相连接的感测电极单 元上直流触控信号的变化。 As shown in FIG. 4, the control circuit 143 of the touch control circuit 140 outputs a DC control signal to each control electrode line of the control electrode line group 132 in a scanning manner, and connects the control electrode lines to which the DC control signal is applied. The active device unit is in an on state, and the active device unit connected to the control electrode line to which the DC control signal is not applied is in an off state; the touch excitation source 141 of the touch circuit 140 simultaneously applies to each detection electrode line of the detection electrode line group 133. DC touch excitation. As the control circuit 143 causes the active device unit on the control electrode line to be in an on state, the DC touch signal on each detection electrode line flows into the sensing electrode line through the active device unit. The signal detecting circuit 142 of the touch circuit 140 detects the change of the touch signal on each detecting electrode line or detects the change of the DC touch signal on each detecting electrode line. Thus, as the control circuit 143 outputs a DC control signal to each control electrode line row by row, the signal detection circuit 142 detects the DC touch on the sensing electrode unit connected to the control electrode line by the active device unit line by line. Control signal changes.
当操作者的手指或其他触控物靠近或接触某感测电极单元的瞬间， 手指或其他 触控物与感测电极单元间形成耦合电容， 通过有源器件单元与此感测电极单元相连 的检测电极线上的直流触控信号， 就会流入此感测电极单元， 也就是向此耦合电容 充电； 信号侦测电路 142通过侦测各条检测电极线上触控信号幅值的变化， 就可找 出充电电流最大的或充电电流超过某阈值的检测电极线； 信号侦测电路 142侦测各 条检测电极线上触控信号的变化， 也可以是找充电时间最长或充电时间超过某阈值 的检测电极线； 再根据此时开启有源器件单元的控制电极线， 就可确定被触的感测 电极单元，从而找出手指或其他触控物在触控基板 110上的位置。有源触控系统 100 成为可探测触控点位置的触控系统。 信号侦测电路 142侦测检测电极线组 133各检 测电极线上触控信号的变化， 也就可以是在上述耦合电容的放电环节进行， 侦测放 电电流的幅值或放电时间的长短。  When an operator's finger or other touch object approaches or contacts a sensing electrode unit, a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the active device unit is connected to the sensing electrode unit. The DC touch signal on the detecting electrode line flows into the sensing electrode unit, that is, the coupling capacitor is charged; the signal detecting circuit 142 detects the change of the amplitude of the touch signal on each detecting electrode line, The detection electrode line with the largest charging current or the charging current exceeding a certain threshold can be found; the signal detecting circuit 142 detects the change of the touch signal on each detecting electrode line, or can find the charging time is the longest or the charging time exceeds a certain time. The detection electrode line of the threshold; according to the control electrode line of the active device unit at this time, the touched sensing electrode unit can be determined, thereby finding the position of the finger or other touch object on the touch substrate 110. The active touch system 100 becomes a touch system that can detect the position of the touch point. The signal detecting circuit 142 detects the change of the touch signal on the detecting electrode line 133, and may also be performed in the discharging step of the coupling capacitor to detect the magnitude of the discharging current or the length of the discharging time.
当操作者多支手指或多个操作者的手指分别触摸触控基板 110的多个位置时， 信号侦测电路 142就会在多个时刻的多条检测电极线上， 侦测到触控信号变化超过 某阈值， 也就是侦测到多个感测电极单元的充电电流超过某阈值， 从而找出多个手 指分别在触控基板 110上的位置。 有源触控系统 100也就成为可辨别多个触控点的 触控系统。 具体实施方式二  When the operator touches multiple positions of the touch substrate 110 by multiple fingers or multiple operators' fingers, the signal detecting circuit 142 detects the touch signals on the plurality of detecting electrode lines at multiple times. The change exceeds a certain threshold, that is, the charging current of the plurality of sensing electrode units is detected to exceed a certain threshold, thereby finding the position of the plurality of fingers on the touch substrate 110 respectively. The active touch system 100 also becomes a touch system that can distinguish multiple touch points. Specific embodiment 2
如图 2所示的有源触控系统 200，包括触控基板 210、薄膜晶体管 (TFT)阵列 220、 触控电极、触控电路 240等。薄膜晶体管 (TFT)阵列 220和触控电极设置在触控基板 210上。 触控电极由感测电极阵列 231以及两组相交的行控制电极线组 232 (2321、 2332、 2323、 …、 232m)和列检测电极线组 233 (2331、 2332、 2333、 …、 233η)组成， 各控制电极线和各检测电极线相交处有绝缘层相隔离。 触控基板 210是透明基板， 感测电极阵列 231的各感测电极单元 〔（232i, 233j) ; i=l, 2,…， m; j=l, 2,…， n; 其 中 m禾 B n是自然数〕 是透明 IT0电极， 感测电极阵列 231、 行控制电极线组 232和 列检测电极 233线组都设置在触控基板 210背向使用者的非触摸面上。触控电路 240 具有触控激励源 241、 信号侦测电路 242和控制电路 243。 The active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like. A thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210. The touch electrode is composed of a sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321). 2332, 2323, ..., 232m) and the column detecting electrode line group 233 (2331, 2332, 2333, ..., 233η) are formed, and each control electrode line and each detecting electrode line are separated by an insulating layer. The touch substrate 210 is a transparent substrate, and each sensing electrode unit of the sensing electrode array 231 [(232i, 233j); i=l, 2,..., m; j=l, 2,..., n; wherein m and B n is a natural number] is a transparent IT0 electrode, and the sensing electrode array 231, the row control electrode line group 232, and the column detecting electrode 233 line group are all disposed on the non-touch surface of the touch substrate 210 facing away from the user. The touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
控制电极线组 232和检测电极线组 233的各控制电极线和各检测电极线， 分别 连接 TFT阵列 220的各 TFT单元的栅极和源极； 感测电极阵列 231的各感测电极单 元分别连接各 TFT单元的漏极； 检测电极线组 233连接触控电路 240中的触控激励 源 241和信号侦测电路 242;控制电极线组 232连接触控电路 240中的控制电路 243。  Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 of the touch control circuit 240; the control electrode line group 232 is connected to the control circuit 243 of the touch control circuit 240.
如图 5所示， 触控电路 240的控制电路 243以扫描方式， 逐行向控制电极线组 232 各控制电极线输出直流控制信号， 让施加有直流控制信号的控制电极线相连的 TFT单元处于导通状态， 未施加直流控制信号的控制电极线相连的 TFT单元处于截 止状态； 触控电路 240的触控激励源 241同时向检测电极线组 233的各检测电极线 施加交流触控激励。 随着控制电路 243每让一行控制电极线上的 TFT单元处于导通 状态， 各检测电极线上的交流触控信号就流入通过 TFT单元与该行控制电极线相连 接的感测电极单元内； 触控电路 240的信号侦测电路 242， 在该行控制电极线相连 接的 TFT单元处于导通状态期间， 逐列检测各条检测电极线上触控信号的变化。 这 样随着控制电路 243逐行向各控制电极线输出直流控制信号， 信号侦测电路 242就 逐行的侦测通过 TFT单元与此行控制电极线相连接的感测电极单元上触控信号的变 化。  As shown in FIG. 5, the control circuit 243 of the touch control circuit 240 outputs a DC control signal to each control electrode line of the control electrode line group 232 in a scanning manner, and the TFT unit to which the control electrode line to which the DC control signal is applied is placed. In the on state, the TFT unit connected to the control electrode line to which the DC control signal is not applied is in an off state; the touch excitation source 241 of the touch control circuit 240 simultaneously applies an AC touch excitation to each detection electrode line of the detection electrode line group 233. As the control circuit 243 causes the TFT unit on the control electrode line to be in an on state, the AC touch signal on each detection electrode line flows into the sensing electrode unit connected to the row control electrode line through the TFT unit; The signal detecting circuit 242 of the touch control circuit 240 detects the change of the touch signal on each detecting electrode line column by column during the conduction state of the TFT unit connected to the control electrode line. Thus, as the control circuit 243 outputs a DC control signal to each control electrode line row by row, the signal detection circuit 242 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
当操作者的手指或其他触控物靠近或接触某感测电极单元时， 手指或其他触控 物与感测电极单元间形成耦合电容， 感测电极单元上的交流触控信号就会通过此耦 合电容部分泄漏出去； 信号侦测电路 242通过侦测各条检测电极线上交流触控信号 幅值的变化， 就可找出漏电流最大的或漏电流超过某阈值的检测电极线； 信号侦测 电路 242侦测各条检测电极线上触控信号的变化， 也可以是找交流触控信号相位变 化最大或交流触控信号相位变化超过某阈值的检测电极线； 再根据此时开启 TFT单 元的控制电极线， 就可确定被触的感测电极单元， 从而找出手指或其他触控物在触 控基板 210上的位置。 有源触控系统 200成为可探测触控点位置的触控系统。  When an operator's finger or other touch object approaches or contacts a sensing electrode unit, a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the AC touch signal on the sensing electrode unit passes through the The coupling capacitor portion leaks out; the signal detecting circuit 242 can detect the detecting electrode line with the largest leakage current or the leakage current exceeding a certain threshold by detecting the change of the amplitude of the AC touch signal on each detecting electrode line; The measuring circuit 242 detects the change of the touch signal on each detecting electrode line, and may also find the detecting electrode line whose phase change of the AC touch signal is the largest or the phase change of the AC touch signal exceeds a certain threshold; The control electrode line can determine the touched sensing electrode unit to find the position of the finger or other touch object on the touch substrate 210. The active touch system 200 becomes a touch system that can detect the position of the touch point.
当操作者多支手指或多个操作者的手指分别触摸触控基板 210的多个位置时， 信号侦测电路 242就会在多个时刻的多条检测电极线上， 侦测到触控信号变化超过 某阈值， 也就是检测到多个感测电极单元的充电电流超过某阈值， 从而找出多个手 指分别在触控基板 210上的位置。 有源触控系统 200也就成为可辨别多个触控点的 触控系统。 具体实施方式三 When the operator touches multiple positions of the touch substrate 210 by multiple fingers or fingers of multiple operators, The signal detecting circuit 242 detects that the touch signal changes beyond a certain threshold on a plurality of detecting electrode lines at a plurality of times, that is, detects that the charging current of the plurality of sensing electrode units exceeds a certain threshold, thereby finding out The position of the plurality of fingers on the touch substrate 210. The active touch system 200 also becomes a touch system that can distinguish multiple touch points. Embodiment 3
如图 2所示的有源触控系统 200，包括触控基板 210、薄膜晶体管 (TFT)阵列 220、 触控电极、触控电路 240等。薄膜晶体管 (TFT)阵列 220和触控电极设置在触控基板 210上。 触控电极由感测电极阵列 231以及两组相交的行控制电极线组 232 (2321、 2332、 2323、 …、 232m)和列检测电极线组 233 (2331、 2332、 2333、 …、 233η)组成， 各控制电极线和各检测电极线相交处有绝缘层相隔离。 触控基板 210是透明基板， 感测电极阵列 231的各感测电极单元 〔（232i, 233j) ; i=l, 2,…， m; j=l, 2,…， n; 其 中 m禾 B n是自然数〕 是透明 IT0电极， 感测电极阵列 231、 行控制电极线组 232和 列检测电极 233线组都设置在触控基板 210背向使用者的非触摸面上。触控电路 240 具有触控激励源 241、 信号侦测电路 242和控制电路 243。  The active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like. A thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210. The touch electrodes are composed of the sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321, 2332, 2323, ..., 232m) and column detecting electrode line groups 233 (2331, 2332, 2333, ..., 233η) The control electrode lines and the detection electrode lines are separated by an insulating layer. The touch substrate 210 is a transparent substrate, and each sensing electrode unit of the sensing electrode array 231 [(232i, 233j); i=l, 2,..., m; j=l, 2,..., n; wherein m and B n is a natural number] is a transparent IT0 electrode, and the sensing electrode array 231, the row control electrode line group 232, and the column detecting electrode 233 line group are all disposed on the non-touch surface of the touch substrate 210 facing away from the user. The touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
控制电极线组 232和检测电极线组 233的各控制电极线和各检测电极线， 分别 连接 TFT阵列 220的各 TFT单元的栅极和源极； 感测电极阵列 231的各感测电极单 元分别连接各 TFT单元的漏极； 检测电极线组 233连接触控电路 240中的触控激励 源 241和信号侦测电路 242;控制电极线组 232连接触控电路 240中的控制电路 243。  Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 of the touch control circuit 240; the control electrode line group 232 is connected to the control circuit 243 of the touch control circuit 240.
如图 6所示， 触控电路 240的控制电路 243以扫描方式， 逐行向控制电极线组 232 各控制电极线输出直流控制信号， 让施加有直流控制信号的控制电极线相连的 TFT单元处于导通状态， 未施加直流控制信号的控制电极线相连的 TFT单元处于截 止状态； 触控电路 240的触控激励源 241的一个输出端向检测电极线组 233的奇数 检测电极线施加交流触控激励，触控激励源 241的另一个输出端向检测电极线组 233 的偶数检测电极线施加零电位信号。 奇数感测电极单元上的交流触控信号， 就会通 过奇数和偶数感测电极单元间的耦合电容流入偶数感测电极单元， 形成感测电极单 元间的耦合电流。 随着控制电路 243每让一行控制电极线上的 TFT单元处于导通状 态， 各奇数检测电极线上的直流触控信号就流入通过 TFT单元与该行控制电极线相 连接的感测电极单元内， 与各偶数检测电极线上通过 TFT单元与该行控制电极线相 连接的感测电极单元处于零电位； 触控电路 240的信号侦测电路 242， 在该行控制 电极线相连接的 TFT单元处于导通状态期间， 逐列检测各条奇数检测电极线上触控 信号的变化。 这样随着控制电路 243逐行向各控制电极线输出直流控制信号， 信号 侦测电路 242就逐行的侦测通过 TFT单元与此行控制电极线相连接的奇数感测电极 单元上触控信号的变化。 As shown in FIG. 6, the control circuit 243 of the touch control circuit 240 outputs a DC control signal to each control electrode line of the control electrode line group 232 in a scanning manner, and the TFT unit to which the control electrode line to which the DC control signal is applied is placed. In the on state, the TFT unit connected to the control electrode line to which the DC control signal is not applied is in an off state; one output end of the touch excitation source 241 of the touch circuit 240 applies an AC touch to the odd detection electrode line of the detection electrode line group 233. The other output end of the touch excitation source 241 is applied to the even detection electrode line of the detection electrode line group 233 to apply a zero potential signal. The AC touch signal on the odd-numbered sensing electrode unit flows into the even-numbered sensing electrode unit through the coupling capacitance between the odd-numbered and even-numbered sensing electrode units to form a coupling current between the sensing electrode units. As the control circuit 243 makes the TFT unit on the control electrode line of one row in an on state, the DC touch signal on each of the odd detection electrode lines flows into the sensing electrode unit connected to the row control electrode line through the TFT unit. And the sensing electrode unit connected to the row control electrode line through the TFT unit and the even-numbered detecting electrode line is at a zero potential; the signal detecting circuit 242 of the touch circuit 240 is controlled in the line During the conduction state of the TFT units connected to the electrode lines, the changes of the touch signals on the lines of the odd detection electrodes are detected column by column. Thus, as the control circuit 243 outputs a DC control signal to each control electrode line row by row, the signal detection circuit 242 detects the touch signal on the odd sensing electrode unit connected to the control electrode line through the TFT unit line by line. The change.
当操作者的手指或其他触控物靠近或接触某感测电极单元的瞬间， 手指或其他 触控物改变了奇数感测电极单元和偶数感测电极单元间的电介质， 也就改变了奇数 感测电极单元和偶数感测电极单元间的耦合电容值， 感测电极单元间的耦合电流就 会发生变化， 与奇数感测电极单元相连的检测电极线上的交流触控信号也就会相应 发生变化； 信号侦测电路 242通过侦测各条奇数检测电极线上交流触控信号幅值的 变化， 就可找出耦合电流最大的或耦合电流超过某阈值的检测电极线； 信号侦测电 路 242侦测各条检测电极线上触控信号的变化， 也可以是找交流触控信号相位变化 最大或交流触控信号相位变化超过某阈值的检测电极线； 再根据此时开启 TFT单元 的控制电极线， 就可确定被触的感测电极单元， 从而找出手指或其他触控物在触控 基板 210上的位置。 有源触控系统 200成为可探测触控点位置的触控系统。  When the operator's finger or other touch object approaches or touches a sensing electrode unit, the finger or other touch object changes the dielectric between the odd-numbered sensing electrode unit and the even-numbered sensing electrode unit, which changes the odd-numbered sense. The coupling capacitance between the electrode unit and the even sensing electrode unit changes the coupling current between the sensing electrode units, and the AC touch signal on the detecting electrode line connected to the odd sensing electrode unit also occurs accordingly. The signal detecting circuit 242 can detect the detecting electrode line whose coupling current is the largest or the coupling current exceeds a certain threshold by detecting the change of the amplitude of the AC touch signal on each of the odd detecting electrode lines; the signal detecting circuit 242 Detecting the change of the touch signal on each detection electrode line, or finding the detection electrode line whose phase change of the AC touch signal is the largest or the phase change of the AC touch signal exceeds a certain threshold; and then according to the control electrode of the TFT unit at this time Line, the touched sensing electrode unit can be determined to find the position of the finger or other touch object on the touch substrate 210. . The active touch system 200 becomes a touch system that can detect the position of the touch point.
当操作者多支手指或多个操作者的手指分别触摸触控基板 210的多个位置时， 信号侦测电路 242就会在多个时刻的多条检测电极线上， 侦测到触控信号变化超过 某阈值， 也就是检测到多个感测电极单元的充电电流超过某阈值， 从而找出多个手 指分别在触控基板 210上的位置。 有源触控系统 200也就成为可辨别多个触控点的 触控系统。 具体实施方式四  When the operator touches multiple positions of the touch substrate 210 by multiple fingers or multiple operators' fingers, the signal detecting circuit 242 detects the touch signals on the plurality of detecting electrode lines at multiple times. The change exceeds a certain threshold, that is, the charging current of the plurality of sensing electrode units is detected to exceed a certain threshold, thereby finding the position of the plurality of fingers on the touch substrate 210. The active touch system 200 also becomes a touch system that can distinguish multiple touch points. DETAILED DESCRIPTION OF THE INVENTION
如图 2所示的有源触控系统 200，包括触控基板 210、薄膜晶体管 (TFT)阵列 220、 触控电极、触控电路 240等。薄膜晶体管 (TFT)阵列 220和触控电极设置在触控基板 210上。 触控电极由感测电极阵列 231以及两组相交的行控制电极线组 232 (2321、 2332、 2323、 …、 232m)和列检测电极线组 233 (2331、 2332、 2333、 …、 233η)组成， 各控制电极线和各检测电极线相交处有绝缘层相隔离。 触控基板 210是透明基板， 感测电极阵列 231的各感测电极单元 〔（232i, 233j) ; i=l, 2,…， m; j=l, 2,…， n; 其 中 m禾 B n是自然数〕 是透明 IT0电极， 感测电极阵列 231、 行控制电极线组 232和 列检测电极 233线组都设置在触控基板 210背向使用者的非触摸面上。触控电路 240 具有触控激励源 241、 信号侦测电路 242和控制电路 243。 控制电极线组 232和检测电极线组 233的各控制电极线和各检测电极线， 分别 连接 TFT阵列 220的各 TFT单元的栅极和源极； 感测电极阵列 231的各感测电极单 元分别连接各 TFT单元的漏极； 检测电极线组 233连接触控电路 240中的触控激励 源 241和信号侦测电路 242 ;控制电极线组 232连接触控电路 240中的控制电路 243。 The active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like. A thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210. The touch electrodes are composed of the sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321, 2332, 2323, ..., 232m) and column detecting electrode line groups 233 (2331, 2332, 2333, ..., 233η) The control electrode lines and the detection electrode lines are separated by an insulating layer. The touch substrate 210 is a transparent substrate, and each sensing electrode unit of the sensing electrode array 231 [(232i, 233j); i=l, 2,..., m; j=l, 2,..., n; wherein m and B n is a natural number] is a transparent IT0 electrode, and the sensing electrode array 231, the row control electrode line group 232, and the column detecting electrode 233 line group are all disposed on the non-touch surface of the touch substrate 210 facing away from the user. The touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243. Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 in the touch circuit 240. The control electrode line group 232 is connected to the control circuit 243 in the touch circuit 240.
如图 7所示， 触控电路 240的控制电路 243以扫描方式， 逐行向控制电极线组 232 各控制电极线输出方波控制信号， 让施加有方波控制信号的控制电极线相连的 TFT单元在导通和截止状态切换， 方波控制信号的频率不小于 ΙΟΚΗζ , 未施加交流控 制信号的控制电极线相连的 TFT单元处于截止状态;触控电路 240的触控激励源 241 同时向检测电极线组 233的各检测电极线施加直流触控激励。 随着控制电路 243每 让一行控制电极线上的 TFT单元在导通和截止状态间切换， 各检测电极线上的直流 触控信号就间歇地流入通过 TFT单元与该行控制电极线相连接的感测电极单元内， 在感测电极单元上形成脉冲直流信号； 触控电路 240的信号侦测电路 242， 在该行 控制电极线相连接的 TFT单元处于导通和截止状态间切换期间， 逐列检测各条检测 电极线上触控信号的变化。 这样随着控制电路 243逐行向各控制电极线输出交流控 制信号， 信号侦测电路 242就逐行的侦测通过 TFT单元与此行控制电极线相连接的 感测电极单元上触控信号的变化。  As shown in FIG. 7, the control circuit 243 of the touch control circuit 240 outputs a square wave control signal to the control electrode lines of the control electrode line group 232 in a scanning manner, and the TFTs to which the control electrode lines to which the square wave control signals are applied are connected. The unit is switched between the on and off states, the frequency of the square wave control signal is not less than ΙΟΚΗζ, and the TFT unit connected to the control electrode line to which the AC control signal is not applied is in an off state; the touch excitation source 241 of the touch circuit 240 is simultaneously directed to the detection electrode DC detection excitation is applied to each detection electrode line of the line group 233. As the control circuit 243 switches between the on and off states of the TFT cells on one row of control electrode lines, the DC touch signals on the respective detection electrode lines intermittently flow into the TFT control unit to be connected to the row control electrode lines. a pulsed DC signal is formed on the sensing electrode unit in the sensing electrode unit; and the signal detecting circuit 242 of the touch control circuit 240 switches between the on and off states of the TFT unit connected to the control electrode line. The column detects changes in the touch signals on the respective detection electrode lines. Thus, as the control circuit 243 outputs an AC control signal to each control electrode line row by row, the signal detection circuit 242 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
当操作者的手指或其他触控物靠近或接触某感测电极单元时， 手指或其他触控 物与感测电极单元间形成耦合电容， 感测电极单元上的脉冲直流信号就会通过此耦 合电容部分泄漏出去，在与该感测电极单元相连接的检测电极线上形成直流漏电流; 信号侦测电路 242通过侦测各条检测电极线上直流触控信号的变化， 就可找出直流 漏电流最大的或直流漏电流超过某阈值的检测电极线； 再根据此时开启 TFT单元在 导通和截止状态间切换的控制电极线， 就可确定被触的感测电极单元， 从而找出手 指或其他触控物在触控基板 210上的位置。 有源触控系统 200成为可探测触控点位 置的触控系统。  When an operator's finger or other touch object approaches or contacts a sensing electrode unit, a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the pulsed DC signal on the sensing electrode unit passes through the coupling. The capacitor portion leaks out, and a DC leakage current is formed on the detection electrode line connected to the sensing electrode unit; the signal detection circuit 242 can find the DC by detecting the change of the DC touch signal on each detection electrode line. The detection electrode line with the largest leakage current or the DC leakage current exceeding a certain threshold; according to the control electrode line that turns on the switching between the on and off states of the TFT unit at this time, the touched sensing electrode unit can be determined, thereby finding out The position of a finger or other touch object on the touch substrate 210. The active touch system 200 becomes a touch system that can detect the position of the touch point.
由于施加在各条检测电极线上的触控激励是直流信号， 当操作者的手指或其他 触控物靠近或接触某检测电极线时， 检测电极线上的直流触控信号， 就基本不会从 手指或其他触控物与检测电极线间的耦合电容泄漏出去； 或者说， 会从手指或其他 触控物与检测电极线间的耦合电容泄漏出去的直流触控信号， 比起从手指或其他触 控物与感测电极单元间的耦合电容泄漏出去的脉冲直流信号要小得多， 避免操作者 触碰检测电极线时可能产生的动作误判。 具体实施方式五 Since the touch excitation applied to each detection electrode line is a DC signal, when the operator's finger or other touch object approaches or contacts a certain detection electrode line, the DC touch signal on the detection electrode line is substantially not Leaking out the coupling capacitance between the finger or other touch object and the detection electrode line; or, the DC touch signal that leaks out from the coupling capacitance between the finger or other touch object and the detection electrode line, compared to the finger or The pulsed DC signal leaked out by the coupling capacitance between the other touch object and the sensing electrode unit is much smaller, and the operation misjudgment that may occur when the operator touches the detecting electrode line is avoided. DETAILED DESCRIPTION OF THE INVENTION
如图 2所示的有源触控系统 200，包括触控基板 210、薄膜晶体管 (TFT)阵列 220、 触控电极、触控电路 240等。薄膜晶体管 (TFT)阵列 220和触控电极设置在触控基板 210上。 触控电极由感测电极阵列 231以及两组相交的行控制电极线组 232 (2321、 2332、 2323、 …、 232m)和列检测电极线组 233 (2331、 2332、 2333、 …、 233η)组成， 各控制电极线和各检测电极线相交处有绝缘层相隔离。 触控基板 210是透明基板， 感测电极阵列 231的各感测电极单元 〔（232i, 233j) ; i=l, 2,…， m; j=l, 2,…， n; 其 中 m禾 B n是自然数〕 是透明 IT0电极， 感测电极阵列 231、 行控制电极线组 232和 列检测电极 233线组都设置在触控基板 210背向使用者的非触摸面上。触控电路 240 具有触控激励源 241、 信号侦测电路 242和控制电路 243。  The active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like. A thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210. The touch electrodes are composed of the sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321, 2332, 2323, ..., 232m) and column detecting electrode line groups 233 (2331, 2332, 2333, ..., 233η) The control electrode lines and the detection electrode lines are separated by an insulating layer. The touch substrate 210 is a transparent substrate, and each sensing electrode unit of the sensing electrode array 231 [(232i, 233j); i=l, 2,..., m; j=l, 2,..., n; wherein m and B n is a natural number] is a transparent IT0 electrode, and the sensing electrode array 231, the row control electrode line group 232, and the column detecting electrode 233 line group are all disposed on the non-touch surface of the touch substrate 210 facing away from the user. The touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
控制电极线组 232和检测电极线组 233的各控制电极线和各检测电极线， 分别 连接 TFT阵列 220的各 TFT单元的栅极和源极； 感测电极阵列 231的各感测电极单 元分别连接各 TFT单元的漏极； 检测电极线组 233连接触控电路 240中的触控激励 源 241和信号侦测电路 242;控制电极线组 232连接触控电路 240中的控制电路 243。  Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 of the touch control circuit 240; the control electrode line group 232 is connected to the control circuit 243 of the touch control circuit 240.
如图 8所示， 触控电路 240的控制电路 243以扫描方式， 逐行向控制电极线组 232 各控制电极线输出正弦波交流控制信号， 让施加有正弦波交流控制信号的控制 电极线相连的 TFT单元， 在导通和截止状态以正弦波的形式变换， 未施加交流控制 信号的控制电极线相连的 TFT单元处于截止状态； 触控电路 240的触控激励源 241 同时向检测电极线组 233的各检测电极线施加正弦波交流触控激励； 控制信号的频 率远低于触控激励信号的频率， 触控激励信号的频率不小于 10KHz。 随着控制电路 243每让一行控制电极线上的 TFT单元在导通和截止状态间正弦的变换， 各检测电 极线上的交流触控信号被控制信号调制后， 流入通过 TFT单元与该行控制电极线相 连接的感测电极单元内， 在感测电极单元上形成被调制的载波形式的信号； 触控电 路 240的信号侦测电路 242， 在该行控制电极线相连接的 TFT单元处于导通和截止 状态在导通和截止状态间正弦变换期间， 逐列检测各条检测电极线上触控信号的变 化。 这样随着控制电路 243逐行向各控制电极线输出交流控制信号， 信号侦测电路 242就逐行的侦测通过 TFT单元与此行控制电极线相连接的感测电极单元上触控信 号的变化。  As shown in FIG. 8, the control circuit 243 of the touch control circuit 240 outputs a sine wave AC control signal to each control electrode line of the control electrode line group 232 in a scanning manner, and connects the control electrode lines to which the sine wave AC control signal is applied. The TFT unit is switched in the form of a sine wave in the on and off states, and the TFT unit connected to the control electrode line to which the AC control signal is not applied is in an off state; the touch excitation source 241 of the touch circuit 240 is simultaneously directed to the detection electrode line group. Each detection electrode line of 233 applies a sine wave AC touch excitation; the frequency of the control signal is much lower than the frequency of the touch excitation signal, and the frequency of the touch excitation signal is not less than 10 KHz. As the control circuit 243 changes the sinusoidal switching between the on and off states of the TFT unit on one row of control electrode lines, the AC touch signal on each detection electrode line is modulated by the control signal, flows into the TFT unit and controls the line. a signal in the form of a modulated carrier is formed on the sensing electrode unit in the sensing electrode unit connected to the electrode line; a signal detecting circuit 242 of the touch circuit 240 is connected to the TFT unit connected to the control electrode line The on and off states detect the change of the touch signal on each of the detection electrode lines column by column during the sinusoidal transformation between the on and off states. Thus, as the control circuit 243 outputs an AC control signal to each control electrode line row by row, the signal detection circuit 242 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
当操作者的手指或其他触控物靠近或接触某感测电极单元时， 手指或其他触控 物与感测电极单元间形成耦合电容， 感测电极单元上的载波信号就会通过此耦合电 容部分泄漏出去， 在与该感测电极单元相连接的检测电极线上形成交流漏电流； 信 号侦测电路 242通过侦测各条检测电极线上交流触控信号的变化， 并对相对高频的 触控信号解调成控制信号频率的低频信号， 找出交流漏电流最大的或交流漏电流超 过某阈值的检测电极线； 再根据此时开启 TFT单元在导通和截止状态间正弦变换的 控制电极线， 就可确定被触的感测电极单元， 从而找出手指或其他触控物在触控基 板 210上的位置。 有源触控系统 200成为可探测触控点位置的触控系统。 When the operator's finger or other touch object approaches or touches a sensing electrode unit, a finger or other touch A coupling capacitor is formed between the object and the sensing electrode unit, and the carrier signal on the sensing electrode unit is partially leaked through the coupling capacitor, and an alternating current leakage current is formed on the detecting electrode line connected to the sensing electrode unit; The measuring circuit 242 detects the change of the AC touch signal on each detecting electrode line, and demodulates the relatively high frequency touch signal into a low frequency signal of the control signal frequency to find out that the AC leakage current is the largest or the AC leakage current exceeds a certain threshold detection electrode line; according to the control electrode line that turns on the sinusoidal transformation between the on and off states of the TFT unit at this time, the touched sensing electrode unit can be determined, thereby finding out that the finger or other touch object is touching The position on the substrate 210 is controlled. The active touch system 200 becomes a touch system that can detect the position of the touch point.
由于对相对高频的触控信号解调成控制信号频率的低频信号， 对特定频率的低 频信号进行测量， 通过成熟的选频滤波技术， 可以避免穿透性强的高频噪音的干扰 和显示面板对触控信号的影响。 具体实施方式六  Since the relatively high frequency touch signal is demodulated into a low frequency signal of the control signal frequency, the low frequency signal of a specific frequency is measured, and the sophisticated frequency selective filtering technology can avoid the interference and display of the high frequency noise with strong penetration. The effect of the panel on the touch signal. Specific Embodiment 6
如图 2所示的有源触控系统 200，包括触控基板 210、薄膜晶体管 (TFT)阵列 220、 触控电极、触控电路 240等。薄膜晶体管 (TFT)阵列 220和触控电极设置在触控基板 210上。 触控电极由感测电极阵列 231以及两组相交的行控制电极线组 232 (2321、 2332、 2323、 …、 232m)和列检测电极线组 233 (2331、 2332、 2333、 …、 233η)组成， 各控制电极线和各检测电极线相交处有绝缘层相隔离。 触控基板 210是透明基板， 感测电极阵列 231的各感测电极单元 〔（232i, 233j) ; i=l, 2,…， m; j=l, 2,…， n; 其 中 m禾 B n是自然数〕 是透明 IT0电极， 感测电极阵列 231、 行控制电极线组 232和 列检测电极 233线组都设置在触控基板 210背向使用者的非触摸面上。触控电路 240 具有触控激励源 241、 信号侦测电路 242和控制电路 243。  The active touch system 200 shown in FIG. 2 includes a touch substrate 210, a thin film transistor (TFT) array 220, a touch electrode, a touch circuit 240, and the like. A thin film transistor (TFT) array 220 and a touch electrode are disposed on the touch substrate 210. The touch electrodes are composed of the sensing electrode array 231 and two sets of intersecting row control electrode line groups 232 (2321, 2332, 2323, ..., 232m) and column detecting electrode line groups 233 (2331, 2332, 2333, ..., 233η) The control electrode lines and the detection electrode lines are separated by an insulating layer. The touch substrate 210 is a transparent substrate, and each sensing electrode unit of the sensing electrode array 231 [(232i, 233j); i=l, 2,..., m; j=l, 2,..., n; wherein m and B n is a natural number] is a transparent IT0 electrode, and the sensing electrode array 231, the row control electrode line group 232, and the column detecting electrode 233 line group are all disposed on the non-touch surface of the touch substrate 210 facing away from the user. The touch circuit 240 has a touch excitation source 241, a signal detection circuit 242, and a control circuit 243.
控制电极线组 232和检测电极线组 233的各控制电极线和各检测电极线， 分别 连接 TFT阵列 220的各 TFT单元的栅极和源极； 感测电极阵列 231的各感测电极单 元分别连接各 TFT单元的漏极； 检测电极线组 233连接触控电路 240中的触控激励 源 241和信号侦测电路 242;控制电极线组 232连接触控电路 240中的控制电路 243。  Each control electrode line and each detection electrode line of the control electrode line group 232 and the detection electrode line group 233 are respectively connected to the gate and the source of each TFT unit of the TFT array 220; the sensing electrode units of the sensing electrode array 231 are respectively The detection electrode line group 233 is connected to the touch excitation source 241 and the signal detection circuit 242 of the touch control circuit 240; the control electrode line group 232 is connected to the control circuit 243 of the touch control circuit 240.
如图 9所示， 触控电路 240的控制电路 243以扫描方式， 逐行向控制电极线组 232 各控制电极线输出正弦波交流控制信号， 让施加有正弦波交流控制信号的控制 电极线相连的 TFT单元， 在导通和截止状态以正弦波的形式变换， 未施加交流控制 信号的控制电极线相连的 TFT单元处于截止状态； 触控电路 240的触控激励源 241 同时向检测电极线组 233的各检测电极线施加正弦波交流触控激励； 触控激励信号 的频率远低于控制信号的频率， 控制信号的频率不小于 10KHz。 随着控制电路 243 每让一行控制电极线上的 TFT单元在导通和截止状态间正弦的变换， 各检测电极线 上的交流触控信号搭载在控制信号上， 流入通过 TFT单元与该行控制电极线相连接 的感测电极单元内， 在感测电极单元上形成以控制信号频率的载波信号； 触控电路 240的信号侦测电路 242，在该行控制电极线相连接的 TFT单元处于导通和截止状态 在导通和截止状态间正弦变换期间， 逐列检测各条检测电极线上触控信号的变化。 这样随着控制电路 243逐行向各控制电极线输出交流控制信号， 信号侦测电路 242 就逐行的侦测通过 TFT单元与此行控制电极线相连接的感测电极单元上触控信号的 变化。 As shown in FIG. 9, the control circuit 243 of the touch control circuit 240 outputs a sine wave AC control signal to each control electrode line of the control electrode line group 232 in a scanning manner, and connects the control electrode lines to which the sine wave AC control signal is applied. The TFT unit is switched in the form of a sine wave in the on and off states, and the TFT unit connected to the control electrode line to which the AC control signal is not applied is in an off state; the touch excitation source 241 of the touch circuit 240 is simultaneously directed to the detection electrode line group. a sine wave AC touch excitation is applied to each detection electrode line of 233; a touch excitation signal The frequency is much lower than the frequency of the control signal, and the frequency of the control signal is not less than 10 kHz. As the control circuit 243 changes the sinusoidal switching between the on and off states of the TFT unit on the control electrode line, the AC touch signal on each detection electrode line is mounted on the control signal, flows into the TFT unit and controls the line. In the sensing electrode unit to which the electrode lines are connected, a carrier signal for controlling the signal frequency is formed on the sensing electrode unit; and the signal detecting circuit 242 of the touch circuit 240 is connected to the TFT unit connected to the control electrode line. The on and off states detect the change of the touch signal on each of the detection electrode lines column by column during the sinusoidal transformation between the on and off states. Thus, as the control circuit 243 outputs an AC control signal to each control electrode line row by row, the signal detection circuit 242 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
当操作者的手指或其他触控物靠近或接触某感测电极单元时， 手指或其他触控 物与感测电极单元间形成耦合电容， 感测电极单元上的载波信号就会通过此耦合电 容部分泄漏出去， 在与该感测电极单元相连接的检测电极线上形成交流漏电流； 信 号侦测电路 242通过侦测各条检测电极线上交流触控信号的变化， 并对特定频率的 低频触控信号进行测量， 相对高频的触控信号解调成控制信号频率的低频信号， 找 出交流漏电流最大的或交流漏电流超过某阈值的检测电极线； 再根据此时开启 TFT 单元在导通和截止状态间正弦变换的控制电极线， 就可确定被触的感测电极单元， 从而找出手指或其他触控物在触控基板 210上的位置。 有源触控系统 200成为可探 测触控点位置的触控系统。  When an operator's finger or other touch object approaches or contacts a sensing electrode unit, a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the carrier signal on the sensing electrode unit passes through the coupling capacitor. Partially leaking out, forming an alternating current leakage current on the detecting electrode line connected to the sensing electrode unit; the signal detecting circuit 242 detecting the change of the alternating touch signal on each detecting electrode line, and detecting the low frequency of the specific frequency The touch signal is measured, and the relatively high frequency touch signal is demodulated into a low frequency signal of the control signal frequency, and the detection electrode line with the largest AC leakage current or the AC leakage current exceeding a certain threshold is found; and then the TFT unit is turned on according to the current The sinusoidal control electrode line between the on and off states determines the touched sensing electrode unit to find the position of the finger or other touch object on the touch substrate 210. The active touch system 200 becomes a touch system that can detect the position of the touch point.
由于对特定频率的低频信号进行测量， 通过成熟的选频滤波技术， 可以避免穿 透性强的高频噪音的干扰和显示面板对触控信号的影响。 具体实施方式七  Due to the measurement of the low frequency signal at a specific frequency, the sophisticated frequency selective filtering technique can avoid the interference of high frequency noise and the influence of the display panel on the touch signal. DETAILED DESCRIPTION OF THE INVENTION
如图 3所示的有源触控系统 300和显示面板 301， 包括触控基板 310、薄膜晶体 管 (TFT)阵列 320、 触控电极、 触控电路 340等。 薄膜晶体管 (TFT)阵列 320和触控 电极设置在触控基板 310上。 触控电极由感测电极阵列 331以及两组相交的行控制 电极线组 332 (3321、 3332、 3323、 …、 332m)、 列检测电极线组 333 (3331、 3332、 3333、 …、 333η)和屏蔽电极 334组成， 各控制电极线和各检测电极线相交处有绝缘 层相隔离。 触控基板 310设置在显示面板 301之上； 触控基板 310是透明基板， 感 测电极阵列 331的各感测电极单元 〔（332i, 333j) ; i=l, 2, -, m; j=l, 2,…， n; 其中 m禾口 n是自然数〕 是透明 IT0电极， 感测电极阵列 331、 行控制电极线组 332、 列检 测电极 333线组和屏蔽电极 334都设置在触控基板 210背向使用者的非触摸面上。 触控电路 340具有触控激励源 341、信号侦测电路 342、控制电路 343和屏蔽信号输 出端 344。 The active touch system 300 and the display panel 301 as shown in FIG. 3 include a touch substrate 310, a thin film transistor (TFT) array 320, a touch electrode, a touch circuit 340, and the like. A thin film transistor (TFT) array 320 and a touch electrode are disposed on the touch substrate 310. The touch electrodes are composed of the sensing electrode array 331 and two sets of intersecting row control electrode line groups 332 (3321, 3332, 3323, ..., 332m), column detecting electrode line groups 333 (3331, 3332, 3333, ..., 333n) and The shielding electrode 334 is composed of an insulating layer at the intersection of each control electrode line and each detecting electrode line. The touch substrate 310 is disposed on the display panel 301; the touch substrate 310 is a transparent substrate, and each sensing electrode unit of the sensing electrode array 331 [(332i, 333j); i=l, 2, -, m ; j= l, 2,..., n; where m and n are natural numbers] are transparent IT0 electrodes, sensing electrode array 331, row control electrode group 332, column inspection The measuring electrode 333 line group and the shielding electrode 334 are both disposed on the non-touch surface of the touch substrate 210 facing away from the user. The touch circuit 340 has a touch excitation source 341, a signal detection circuit 342, a control circuit 343, and a mask signal output terminal 344.
控制电极线组 332和检测电极线组 333的各控制电极线和各检测电极线， 分别 连接 TFT阵列 320的各 TFT单元的栅极和源极； 感测电极阵列 331的各感测电极单 元分别连接各 TFT单元的漏极； 检测电极线组 333连接触控电路 340中的触控激励 源 341和信号侦测电路 342 ;控制电极线组 332连接触控电路 340中的控制电路 343， 屏蔽电极 334连接触控电路 340中的屏蔽信号输出端 344。  Each control electrode line and each detection electrode line of the control electrode line group 332 and the detection electrode line group 333 are respectively connected to the gate and the source of each TFT unit of the TFT array 320; the sensing electrode units of the sensing electrode array 331 are respectively Connecting the drains of the TFT units; the detecting electrode group 333 is connected to the touch excitation source 341 and the signal detecting circuit 342 in the touch circuit 340; the control electrode group 332 is connected to the control circuit 343 in the touch circuit 340, and the shielding electrode 334 connects the masked signal output 344 in touch circuit 340.
如图 10所示， 触控电路 340的控制电路 343以扫描方式， 逐行向控制电极线组 332 各控制电极线输出方波控制信号， 让施加有方波控制信号的控制电极线相连的 TFT 单元在导通和截止状态间切换， 未施加交流控制信号的控制电极线相连的 TFT 单元处于截止状态； 触控电路 340的触控激励源 341同时向检测电极线组 333的各 检测电极线施加直流触控激励；触控电路 340的屏蔽信号输出端 344向屏蔽电极 334 施加直流屏蔽信号。 随着控制电路 343每让一行控制电极线上的 TFT单元在导通和 截止状态间切换， 各检测电极线上的直流触控信号就间歇地流入通过 TFT单元与该 行控制电极线相连接的感测电极单元内， 在感测电极单元上形成脉冲直流信号； 触 控电路 340的信号侦测电路 342， 在该行控制电极线相连接的 TFT单元处于导通和 截止状态间切换期间， 逐列检测各条检测电极线上触控信号的变化。 这样随着控制 电路 343逐行向各控制电极线输出交流控制信号， 信号侦测电路 342就逐行的侦测 通过 TFT单元与此行控制电极线相连接的感测电极单元上触控信号的变化。  As shown in FIG. 10, the control circuit 343 of the touch control circuit 340 outputs a square wave control signal to the control electrode lines of the control electrode line group 332 in a scanning manner, and the TFTs to which the control electrode lines to which the square wave control signals are applied are connected. The unit is switched between the on and off states, and the TFT unit connected to the control electrode line to which the AC control signal is not applied is in an off state; the touch excitation source 341 of the touch control circuit 340 simultaneously applies to each detection electrode line of the detection electrode line group 333. The DC touch excitation; the shield signal output terminal 344 of the touch circuit 340 applies a DC shield signal to the shield electrode 334. As the control circuit 343 switches between the on and off states of the TFT cells on one row of control electrode lines, the DC touch signals on the respective detection electrode lines intermittently flow into the TFT control unit through the TFT unit. In the sensing electrode unit, a pulsed DC signal is formed on the sensing electrode unit; and the signal detecting circuit 342 of the touch control circuit 340 is switched between the on and off states of the TFT unit connected to the control electrode line. The column detects changes in the touch signals on the respective detection electrode lines. Thus, as the control circuit 343 outputs an AC control signal to each control electrode line row by row, the signal detection circuit 342 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
当操作者的手指或其他触控物靠近或接触某感测电极单元时， 手指或其他触控 物与感测电极单元间形成耦合电容， 感测电极单元上的脉冲直流信号就会通过此耦 合电容部分泄漏出去，在与该感测电极单元相连接的检测电极线上形成直流漏电流; 信号侦测电路 342通过侦测各条检测电极线上直流触控信号的变化， 就可找出直流 漏电流最大的或直流漏电流超过某阈值的检测电极线； 再根据此时开启 TFT单元在 导通和截止状态间切换的控制电极线， 就可确定被触的感测电极单元， 从而找出手 指或其他触控物在触控基板 310上的位置。 有源触控系统 300成为可探测触控点位 置的触控系统。  When an operator's finger or other touch object approaches or contacts a sensing electrode unit, a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the pulsed DC signal on the sensing electrode unit passes through the coupling. The capacitor portion leaks out, and a DC leakage current is formed on the detection electrode line connected to the sensing electrode unit; the signal detection circuit 342 can find the DC by detecting the change of the DC touch signal on each detection electrode line. The detection electrode line with the largest leakage current or the DC leakage current exceeding a certain threshold; according to the control electrode line that turns on the switching between the on and off states of the TFT unit at this time, the touched sensing electrode unit can be determined, thereby finding out The position of a finger or other touch object on the touch substrate 310. The active touch system 300 becomes a touch system that can detect the position of the touch point.
对屏蔽电极 334施加直流屏蔽信号，虽然会让感测电极单元上的脉冲直流信号， 通过感测电极单元与屏蔽电极 334间的耦合电容部分泄漏出去， 让检测电极线上存 在一个背景直流漏电流，但施加有直流屏蔽信号的屏蔽电极 334隔离了显示面板 301 上显示信号对触控信号的影响。 Applying a DC shielding signal to the shielding electrode 334 causes the pulsed DC signal on the sensing electrode unit to leak out through the coupling capacitance portion between the sensing electrode unit and the shielding electrode 334, so that the detecting electrode line is stored. The shield electrode 334, which has a DC leakage current in the background but is applied with a DC shield signal, isolates the influence of the display signal on the display panel 301 on the touch signal.
也可以对屏蔽电极 334施加与控制信号波形、频率和相位相同的屏蔽信号（见图 11)， 感测电极单元上的脉冲直流信号也是与控制信号波形、 频率和相位相同， 屏蔽 电极 334上的屏蔽信号就与感测电极单元上的信号波形、 频率和相位相同； 就可以 尽可能减少感测电极单元上的脉冲直流信号， 从感测电极单元与屏蔽电极 334间的 耦合电容的泄漏， 同时屏蔽电极 334又可隔离显示面板 301上显示信号对触控信号 的影响。 具体实施方式八  It is also possible to apply a shielding signal (see FIG. 11) to the shielding electrode 334 which is the same as the control signal waveform, frequency and phase. The pulse DC signal on the sensing electrode unit is also the same as the control signal waveform, frequency and phase, on the shielding electrode 334. The shielding signal is the same as the signal waveform, frequency and phase on the sensing electrode unit; the pulse DC signal on the sensing electrode unit can be reduced as much as possible, and the coupling capacitance between the sensing electrode unit and the shielding electrode 334 is leaked simultaneously. The shielding electrode 334 can in turn isolate the influence of the display signal on the display panel 301 on the touch signal. Embodiment 8
如图 3所示的有源触控系统 300和显示面板 301， 包括触控基板 310、薄膜晶体 管 (TFT)阵列 320、 触控电极、 触控电路 340等。 薄膜晶体管 (TFT)阵列 320和触控 电极设置在触控基板 310上。 触控电极由感测电极阵列 331以及两组相交的行控制 电极线组 332 (3321、 3332、 3323、 …、 332m)、 列检测电极线组 333 (3331、 3332、 3333、 …、 333η)和屏蔽电极 334组成， 各控制电极线和各检测电极线相交处有绝缘 层相隔离。 触控基板 310设置在显示面板 301之上； 触控基板 310是透明基板， 感 测电极阵列 331的各感测电极单元 〔（332i, 333j) ; i=l, 2, -, m; j=l, 2,…， n; 其中 m禾口 n是自然数〕 是透明 IT0电极， 感测电极阵列 331、 行控制电极线组 332、 列检 测电极 333线组和屏蔽电极 334都设置在触控基板 210背向使用者的非触摸面上。 触控电路 340具有触控激励源 341、信号侦测电路 342、控制电路 343和屏蔽信号输 出端 344。 The active touch system 300 and the display panel 301 as shown in FIG. 3 include a touch substrate 310, a thin film transistor (TFT) array 320, a touch electrode, a touch circuit 340, and the like. A thin film transistor (TFT) array 320 and a touch electrode are disposed on the touch substrate 310. The touch electrodes are composed of the sensing electrode array 331 and two sets of intersecting row control electrode line groups 332 (3321, 3332, 3323, ..., 332m), column detecting electrode line groups 333 (3331, 3332, 3333, ..., 333n) and The shielding electrode 334 is composed of an insulating layer at the intersection of each control electrode line and each detecting electrode line. The touch substrate 310 is disposed on the display panel 301; the touch substrate 310 is a transparent substrate, and each sensing electrode unit of the sensing electrode array 331 [(332i, 333j); i=l, 2, -, m ; j= l, 2,..., n; wherein m and n are natural numbers] are transparent IT0 electrodes, and the sensing electrode array 331, the row control electrode line group 332, the column detecting electrode 333 line group, and the shielding electrode 334 are all disposed on the touch substrate. 210 faces away from the user's non-touch surface. The touch circuit 340 has a touch excitation source 341, a signal detection circuit 342, a control circuit 343, and a mask signal output terminal 344.
控制电极线组 332和检测电极线组 333的各控制电极线和各检测电极线， 分别 连接 TFT阵列 320的各 TFT单元的栅极和源极； 感测电极阵列 331的各感测电极单 元分别连接各 TFT单元的漏极； 检测电极线组 333连接触控电路 340中的触控激励 源 341和信号侦测电路 342;控制电极线组 332连接触控电路 340中的控制电路 343， 屏蔽电极 334连接触控电路 340中的屏蔽信号输出端 344。  Each control electrode line and each detection electrode line of the control electrode line group 332 and the detection electrode line group 333 are respectively connected to the gate and the source of each TFT unit of the TFT array 320; the sensing electrode units of the sensing electrode array 331 are respectively Connecting the drain of each TFT unit; the detecting electrode group 333 is connected to the touch excitation source 341 and the signal detecting circuit 342 in the touch circuit 340; the control electrode line group 332 is connected to the control circuit 343 in the touch circuit 340, and the shielding electrode 334 connects the masked signal output 344 in touch circuit 340.
如图 12所示， 触控电路 340的控制电路 343以扫描方式， 逐行向控制电极线组 332 各控制电极线输出直流控制信号， 让施加有直流控制信号的控制电极线相连的 TFT单元处于导通状态， 未施加直流控制信号的控制电极线相连的 TFT单元处于截 止状态； 触控电路 340的触控激励源 341同时向检测电极线组 333的各检测电极线 施加交流触控激励； 触控电路 340的屏蔽信号输出端 344向屏蔽电极 334施加交流 屏蔽信号， 交流屏蔽信号的波形、 频率和相位与施加在检测电极线组 333上触控信 号的波形、 频率和相位相同。 随着控制电路 343每让一行控制电极线上的 TFT单元 处于导通状态， 各检测电极线上的交流触控信号就流入通过 TFT单元与该行控制电 极线相连接的感测电极单元内； 触控电路 340的信号侦测电路 342， 在该行控制电 极线相连接的 TFT单元处于导通状态期间， 逐列检测各条检测电极线上触控信号的 变化。 这样随着控制电路 343逐行向各控制电极线输出直流控制信号， 信号侦测电 路 342就逐行的侦测通过 TFT单元与此行控制电极线相连接的感测电极单元上触控 信号的变化。 As shown in FIG. 12, the control circuit 343 of the touch control circuit 340 outputs a DC control signal to each control electrode line of the control electrode line group 332 in a scanning manner, and the TFT unit to which the control electrode line to which the DC control signal is applied is placed. In the on state, the TFT unit connected to the control electrode line to which the DC control signal is not applied is in an off state; the touch excitation source 341 of the touch control circuit 340 simultaneously goes to the detection electrode line of the detection electrode line group 333. Applying the AC touch excitation; the shield signal output terminal 344 of the touch circuit 340 applies an AC shield signal to the shield electrode 334, and the waveform, frequency and phase of the AC shield signal and the waveform and frequency of the touch signal applied to the detection electrode group 333 Same as phase. As the control circuit 343 turns on the TFT unit on the control electrode line, the AC touch signal on each detection electrode line flows into the sensing electrode unit connected to the row control electrode line through the TFT unit; The signal detecting circuit 342 of the touch control circuit 340 detects the change of the touch signal on each of the detecting electrode lines column by column during the conduction state of the TFT unit connected to the control electrode line. Thus, as the control circuit 343 outputs a DC control signal to each control electrode line row by row, the signal detection circuit 342 detects the touch signal on the sensing electrode unit connected to the control electrode line through the TFT unit line by line. Variety.
当操作者的手指或其他触控物靠近或接触某感测电极单元时， 手指或其他触控 物与感测电极单元间形成耦合电容， 感测电极单元上的交流触控信号就会通过此耦 合电容部分泄漏出去； 信号侦测电路 342通过侦测各条检测电极线上交流触控信号 的变化， 就可找出漏电流最大的或漏电流超过某阈值的检测电极线； 信号侦测电路 342 侦测各条检测电极线上触控信号的变化， 也可以是找交流触控信号相位变化最 大或交流触控信号相位变化超过某阈值的检测电极线； 再根据此时开启 TFT单元的 控制电极线， 就可确定被触的感测电极单元， 从而找出手指或其他触控物在触控基 板 310上的位置。 有源触控系统 300成为可探测触控点位置的触控系统。  When an operator's finger or other touch object approaches or contacts a sensing electrode unit, a coupling capacitance is formed between the finger or other touch object and the sensing electrode unit, and the AC touch signal on the sensing electrode unit passes through the The coupling capacitor partially leaks out; the signal detecting circuit 342 can detect the change of the AC touch signal on each detecting electrode line, and can find the detecting electrode line with the largest leakage current or the leakage current exceeding a certain threshold; the signal detecting circuit 342 detecting the change of the touch signal on each detection electrode line, or finding the detection electrode line whose phase change of the AC touch signal is the largest or the phase change of the AC touch signal exceeds a certain threshold; and then controlling the TFT unit according to the current time The electrode line can determine the touched sensing electrode unit to find the position of the finger or other touch object on the touch substrate 310. The active touch system 300 becomes a touch system that can detect the position of the touch point.
对屏蔽电极 334施加与检测电极线组上的交流触控信号波形、频率和相位相同， 屏蔽电极 334上的屏蔽信号就与感测电极单元上的信号波形、 频率和相位相同； 就 可以尽可能减少感测电极单元上的交流触控信号， 从感测电极单元与屏蔽电极 334 间的耦合电容的泄漏， 同时屏蔽电极 334又可隔离显示面板 301上显示信号对触控 信号的影响。 以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不能认 定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通技术人员 来说， 在不脱离本发明构思的前提下， 还可以做出若干简单推演或替换， 都应当视 为属于本发明的保护范围。  The shielding electrode 334 is applied with the same waveform, frequency and phase of the AC touch signal on the detecting electrode group, and the shielding signal on the shielding electrode 334 is the same as the signal waveform, frequency and phase on the sensing electrode unit; The AC touch signal on the sensing electrode unit is reduced, and the coupling capacitance between the sensing electrode unit and the shielding electrode 334 is leaked, and the shielding electrode 334 can isolate the influence of the display signal on the display panel 301 on the touch signal. The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments. It is not intended that the specific embodiments of the invention are limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Claims

权 利 要 求 书 Claim
1、一种有源触控系统的驱动方法，有源触控系统由有源触控面板和触控电路 等组成， 有源触控面板的基板上具有阵列排布的有源器件单元、 阵列排布的感测 电极单元、 以及不少于两组相交的控制电极线和检测电极线， 各控制电极线和各 检测电极线相交处有绝缘层相隔离； 触控电路具有触控激励源、 信号检测电路和 控制电路； 有源触控面板上的感测电极单元连接有源器件， 有源器件连接控制电 极和检测电极， 检测电极连接触控电路中的触控激励源和信号检测电路， 控制电 极连接触控电路中的控制电路； 触控电路以扫描方式向各控制电极线施加控制信 号， 控制有源器件单元的导通状态， 并通过侦测检测电极线上触控信号的变化， 来确定触控点的位置； 其特征在于： A driving method of an active touch system, the active touch system is composed of an active touch panel and a touch circuit, and the active touch unit has an array of active device units and arrays on the substrate a sensing electrode unit arranged, and not less than two sets of control electrode lines and detecting electrode lines, wherein the control electrode lines and the detecting electrode lines are separated by an insulating layer; the touch circuit has a touch excitation source, a signal detecting circuit and a control circuit; a sensing electrode unit on the active touch panel is connected to the active device, the active device is connected to the control electrode and the detecting electrode, and the detecting electrode is connected to the touch excitation source and the signal detecting circuit in the touch circuit, The control electrode is connected to the control circuit in the touch circuit; the touch circuit applies a control signal to each control electrode line in a scanning manner, controls the conduction state of the active device unit, and detects the change of the touch signal on the detection electrode line, To determine the location of the touch point; it is characterized by:
在触控电路向某一条控制电极线施加控制信号， 让与施加有控制信号的控制 电极线相连接的有源器件单元处于导通态的期间， 所述控制信号是直流信号； 同 时， 触控电路通过检测电极线向感测电极单元施加触控信号， 并侦测检测电极线 上触控信号的变化， 来确定感测电极单元是否被触控。  When the touch circuit applies a control signal to a certain control electrode line to allow the active device unit connected to the control electrode line to which the control signal is applied to be in an on state, the control signal is a direct current signal; The circuit applies a touch signal to the sensing electrode unit through the detecting electrode line, and detects a change of the touch signal on the detecting electrode line to determine whether the sensing electrode unit is touched.
2、 根据权利要求 1所述的有源触控系统， 其特征在于：  2. The active touch system of claim 1 wherein:
所述触控信号是直流信号， 触控电路通过侦测施加在检测电极线上的直流触 控信号的变化， 来确定感测电极单元是否被触控。  The touch signal is a DC signal, and the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the DC touch signal applied to the detecting electrode line.
3、 根据权利要求 1所述的有源触控系统， 其特征在于：  3. The active touch system of claim 1 wherein:
所述触控信号是交流信号， 触控电路通过侦测施加在检测电极线上的交流触 控信号的变化， 来确定感测电极单元是否被触控。  The touch signal is an alternating current signal, and the touch circuit determines whether the sensing electrode unit is touched by detecting a change of an alternating current touch signal applied to the detecting electrode line.
4、一种有源触控系统的驱动方法，有源触控系统由有源触控面板和触控电路 等组成， 有源触控面板的基板上具有阵列排布的有源器件单元、 阵列排布的感测 电极单元、 以及不少于两组相交的控制电极线和检测电极线， 各控制电极线和各 检测电极线相交处有绝缘层相隔离； 触控电路具有触控激励源、 信号检测电路和 控制电路； 有源触控面板上的感测电极单元连接有源器件， 有源器件连接控制电 极和检测电极， 检测电极连接触控电路中的触控激励源和信号检测电路， 控制电 极连接触控电路中的控制电路； 触控电路以扫描方式向各控制电极线施加控制信 号， 控制有源器件单元的导通状态， 并通过侦测检测电极线上触控信号的变化， 来确定触控点的位置； 其特征在于： 在触控电路向某一条控制电极线施加控制信号时，所述控制信号是交流信号； 同时， 触控电路通过检测电极线向感测电极单元施加触控信号， 并侦测检测电极 线上触控信号的变化， 来确定感测电极单元是否被触控。 4. An active touch system driving method, the active touch system is composed of an active touch panel and a touch circuit, and the active touch unit has an array of active device units and arrays on the substrate a sensing electrode unit arranged, and not less than two sets of control electrode lines and detecting electrode lines, wherein the control electrode lines and the detecting electrode lines are separated by an insulating layer; the touch circuit has a touch excitation source, a signal detecting circuit and a control circuit; a sensing electrode unit on the active touch panel is connected to the active device, the active device is connected to the control electrode and the detecting electrode, and the detecting electrode is connected to the touch excitation source and the signal detecting circuit in the touch circuit, The control electrode is connected to the control circuit in the touch circuit; the touch circuit applies a control signal to each control electrode line in a scanning manner, controls the conduction state of the active device unit, and detects the change of the touch signal on the detection electrode line, To determine the location of the touch point; it is characterized by: When the touch control circuit applies a control signal to a certain control electrode line, the control signal is an alternating current signal; meanwhile, the touch circuit applies a touch signal to the sensing electrode unit through the detecting electrode line, and detects the touch of the detecting electrode line. The change of the control signal determines whether the sensing electrode unit is touched.
5、 根据权利要求 4所述的有源触控系统， 其特征在于：  5. The active touch system of claim 4, wherein:
所述触控信号是直流信号， 触控电路通过侦测施加在检测电极线上的直流触 控信号的变化， 来确定感测电极单元是否被触控。  The touch signal is a DC signal, and the touch circuit determines whether the sensing electrode unit is touched by detecting a change of the DC touch signal applied to the detecting electrode line.
6、 根据权利要求 4所述的有源触控系统， 其特征在于：  6. The active touch system of claim 4, wherein:
所述触控信号是交流信号， 触控电路通过侦测施加在检测电极线上的交流触 控信号的变化， 来确定感测电极单元是否被触控。  The touch signal is an alternating current signal, and the touch circuit determines whether the sensing electrode unit is touched by detecting a change of an alternating current touch signal applied to the detecting electrode line.
7、 根据权利要求 6所述的有源触控系统， 其特征在于：  7. The active touch system of claim 6 wherein:
所述交流控制信号的频率， 低于所述交流触控信号的频率。  The frequency of the AC control signal is lower than the frequency of the AC touch signal.
8、 根据权利要求 6所述的有源触控系统， 其特征在于：  8. The active touch system of claim 6 wherein:
所述交流控制信号的频率， 不低于所述交流触控信号的频率。  The frequency of the AC control signal is not lower than the frequency of the AC touch signal.
9、 根据权利要求 3或 6所述的有源触控系统， 其特征在于：  9. The active touch system according to claim 3 or 6, wherein:
所述交流信号 （交流触控信号或交流控制信号） 的频率不小于 10KHz。  The frequency of the AC signal (AC touch signal or AC control signal) is not less than 10 kHz.
10、 根据权利要求 2或 3或 5或 6所述的有源触控系统， 其特征在于： 所述交流控制信号的波形或交流触控信号的波形， 可以是方波， 也可以是正 弦波， 也可以是其他周期性的波形。  The active touch system according to claim 2 or 3 or 5 or 6, wherein: the waveform of the AC control signal or the waveform of the AC touch signal may be a square wave or a sine wave. , can also be other periodic waveforms.
11、 根据权利要求 1或 4所述的有源触控系统， 其特征在于：  The active touch system according to claim 1 or 4, characterized in that:
所述有源触控系统的检测电极线组中， 具有相邻检测电极连接触控电路中触 控激励源的不同激励端， 所述触控激励源的不同激励端上信号的波形或频率或相 位， 可以是相同的， 也可以是不同的。  In the detection electrode line group of the active touch system, the adjacent detection electrodes are connected to different excitation ends of the touch excitation source in the touch circuit, and the waveform or frequency of the signal on the different excitation ends of the touch excitation source or Phases can be the same or different.
12、 根据权利要求 1或 4所述的有源触控系统， 其特征在于：  12. The active touch system of claim 1 or 4, wherein:
所述触控电路具有连接设置在感测电极单元阵列和显示面板电极之间的屏蔽 电极的输出端， 在所述有源器件单元处于导通态的期间， 有触控电路施加给屏蔽 电极的信号是直流信号。  The touch circuit has an output end connected to the shielding electrode disposed between the sensing electrode unit array and the display panel electrode, and the touch circuit is applied to the shielding electrode during the conducting state of the active device unit. The signal is a DC signal.
13、 根据权利要求 1或 4所述的有源触控系统， 其特征在于：  13. The active touch system of claim 1 or 4, wherein:
所述触控电路具有连接设置在感测电极单元阵列和显示面板电极之间的屏蔽 电极的输出端， 在所述有源器件单元处于导通态的期间， 触控电路施加给屏蔽电 极的信号波形、 频率和相位， 与触控电路施加在控制电极线上的， 或与施加在检 测电极线上的信号波形、 频率和相位是相同的。 The touch circuit has an output end connected to the shielding electrode disposed between the sensing electrode unit array and the display panel electrode, and the signal applied by the touch circuit to the shielding electrode during the active state of the active device unit Waveform, frequency and phase, applied to the control electrode line with the touch circuit, or applied to the test The signal waveform, frequency and phase on the electrode line are the same.
14、 根据权利要求 12或 13所述的有源触控系统， 其特征在于：  14. An active touch system according to claim 12 or 13, characterized in that:
所述显示面板是有源液晶显示面板， 所述触控电路连接屏蔽电极的输出端， 是连接到有源液晶显示面板的显示公共电极上， 以显示公共电极作为屏蔽电极。  The display panel is an active liquid crystal display panel, and the output end of the touch circuit connected to the shield electrode is connected to the display common electrode of the active liquid crystal display panel to display the common electrode as a shield electrode.
15、 根据权利要求 1或 4所述的有源触控系统， 其特征在于：  The active touch system according to claim 1 or 4, characterized in that:
所述触控电路侦测检测电极线上触控信号的变化， 是通过检测电极线测量其 所连接感测电极单元充电或放电的幅值特征。  The touch circuit detects the change of the touch signal on the detecting electrode line, and measures the amplitude characteristic of charging or discharging of the connected sensing electrode unit by detecting the electrode line.
16、 根据权利要求 1或 4所述的有源触控系统， 其特征在于：  16. The active touch system of claim 1 or 4, wherein:
所述触控电路侦测检测电极线上触控信号的变化， 是通过检测电极线测量其 所连接感测电极单元充电或放电的时间特征。  The touch circuit detects the change of the touch signal on the detecting electrode line, and measures the time characteristic of charging or discharging the connected sensing electrode unit by detecting the electrode line.
17、 根据权利要求 1或 4所述的有源触控系统， 其特征在于：  17. The active touch system of claim 1 or 4, wherein:
所述触控电路侦测检测电极线上触控信号的变化， 是通过检测电极线测量其 所连接感测电极单元漏电流的幅值特征。  The touch circuit detects the change of the touch signal on the detecting electrode line, and measures the amplitude characteristic of the leakage current of the connected sensing electrode unit by detecting the electrode line.
18、 根据权利要求 1或 4所述的有源触控系统， 其特征在于：  18. The active touch system of claim 1 or 4, wherein:
所述触控电路侦测检测电极线上触控信号的变化， 是通过检测电极线测量其 所连接感测电极单元漏电流的相位特征。  The touch circuit detects a change of the touch signal on the detecting electrode line, and measures a phase characteristic of the leakage current of the connected sensing electrode unit by detecting the electrode line.
PCT/CN2011/081152 2011-10-21 2011-10-21 Drive method for active touch control system WO2013056472A1 (en)

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