WO2011125522A1 - タッチセンサ付き表示装置 - Google Patents
タッチセンサ付き表示装置 Download PDFInfo
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- WO2011125522A1 WO2011125522A1 PCT/JP2011/057220 JP2011057220W WO2011125522A1 WO 2011125522 A1 WO2011125522 A1 WO 2011125522A1 JP 2011057220 W JP2011057220 W JP 2011057220W WO 2011125522 A1 WO2011125522 A1 WO 2011125522A1
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- Prior art keywords
- sensor
- circuit
- touch sensor
- output
- display device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
Definitions
- the present invention relates to a display device including a touch sensor that can detect a position where a finger or the like is in contact.
- touch sensor also referred to as a “touch panel”
- the touch sensor is an input device that enables an operation instruction and data input by detecting the position of a part touched by a finger, a pen, or the like.
- a position detection method a capacitive coupling method, a resistive film method, an infrared method, an ultrasonic method, an electromagnetic induction / coupling method, and the like are known.
- the touch sensor When the touch sensor is used integrally with the display device, the touch sensor receives noise from the display device, and the position detection accuracy of the touch sensor is lowered.
- the display device uses a liquid crystal panel
- an induced voltage is generated in the position detection conductive film of the touch sensor due to a common voltage applied to the counter electrode of the liquid crystal panel. This induced voltage causes noise.
- the display device with a touch sensor disclosed in the patent document includes a strobe signal generation circuit and a noise cut current signal generation circuit.
- the strobe signal generation circuit generates a strobe signal synchronized with the polarity inversion period of the common voltage supplied to the counter electrode.
- the noise cut current signal generation circuit generates a noise cut current signal obtained by removing a predetermined portion from a current flowing from a terminal connected to the touch sensor unit based on the strobe signal.
- the above-described conventional configuration requires a dedicated circuit for noise removal, which is a strobe signal generation circuit and a noise cut current signal generation circuit, and thus the structure becomes complicated.
- An object of the present invention is to provide a display device with a touch sensor that can avoid the influence of noise caused by polarity inversion of the common voltage of the display device without using a strobe signal generation circuit or a noise cut current signal generation circuit. is there.
- a display device with a touch sensor disclosed herein includes an active matrix substrate including a plurality of pixel electrodes, a display medium layer, and a counter substrate including a counter electrode facing the pixel electrodes.
- a display panel that supplies a display signal voltage to the plurality of pixel electrodes and supplies a common voltage with periodic inversion of polarity to the counter electrode, and a counter substrate of the display panel
- a touch sensor unit having a plurality of sensor electrodes that are arranged on the surface on the side and whose electrical characteristics change when touched by a contact body, and the sensor electrodes are sequentially connected to the sensor electrodes according to the electrical characteristics of the connected sensor electrodes.
- a sensor output readout circuit for outputting the detected signal voltage as sensor data, a sensor control circuit for supplying a control signal to the sensor output readout circuit, and the sensor output circuit. And a coordinate calculation circuit that detects a position touched by the contact body in the touch sensor unit based on a signal voltage output from the output output circuit.
- the sensor control circuit detects the position by the coordinate calculation circuit.
- a scan operation for outputting sensor data for one screen to be performed from the sensor output readout circuit is divided into a plurality of times so as not to overlap when the polarity of the common voltage is reversed.
- a coordinate position detection circuit for detecting a position touched by the contact body in the touch sensor unit.
- the display apparatus with a touch sensor which can avoid the influence of the noise resulting from the polarity inversion of the common voltage of a display apparatus, without using special circuits, such as a strobe signal generation circuit and a noise cut current signal generation circuit Can be provided.
- FIG. 1 is a schematic diagram showing a configuration of a display device with a touch sensor according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram showing, in particular, a connection relationship with a drive circuit and the like in the configuration of the display device with a touch sensor according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating an example of a time change of the common voltage (COM voltage) applied to the counter electrode of the display panel.
- FIG. 4A is a schematic diagram illustrating a configuration example in which only the transparent conductive film for detecting the touch position in the X direction is extracted from the transparent conductive film of the touch sensor unit.
- FIG. 1 is a schematic diagram showing a configuration of a display device with a touch sensor according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram showing, in particular, a connection relationship with a drive circuit and the like in the configuration of the display device with a touch sensor according to the first embodiment of the present invention.
- FIG. 3 is
- FIG. 4B is a schematic diagram illustrating a configuration example in which only the transparent conductive film for detecting the touch position in the Y direction is extracted from the transparent conductive film of the touch sensor unit.
- FIG. 4C is a schematic diagram illustrating the entire configuration of the transparent conductive film of the touch sensor unit.
- FIG. 5 is a circuit diagram showing an internal configuration of the touch sensor circuit.
- FIG. 6 is a flowchart illustrating an example of the operation of the touch sensor circuit.
- FIG. 7 is a timing diagram illustrating the relationship among the common voltage, the horizontal synchronization signal, and the scanning operation in the touch sensor circuit according to the first embodiment.
- FIG. 8 is a timing diagram illustrating a relationship among the common voltage, the horizontal synchronization signal, and the scan operation in the touch sensor circuit according to the modification of the first embodiment.
- FIG. 9 is a flowchart showing a modification of the operation of the touch sensor circuit according to the second embodiment.
- FIG. 10 is a timing diagram illustrating a relationship among the common voltage, the horizontal synchronization signal, and the scan operation in the touch sensor circuit according to the second embodiment.
- FIG. 11 is a timing diagram illustrating the relationship among the common voltage, the horizontal synchronization signal, and the scan operation in the touch sensor circuit according to the modification of the second embodiment.
- FIG. 12 is a timing chart showing the relationship among the common voltage, the horizontal synchronization signal, and the scan operation in the touch sensor circuit in the case of 2-line inversion driving.
- a display device with a touch sensor includes a display panel having an active matrix substrate including a plurality of pixel electrodes, a display medium layer, and a counter substrate including a counter electrode facing the plurality of pixel electrodes. And a display panel driving circuit for supplying a display signal voltage to the plurality of pixel electrodes and supplying a common voltage with periodic inversion of polarity to the counter electrode, and a display panel driving circuit disposed on the counter substrate side surface of the display panel
- a touch sensor unit having a plurality of sensor electrodes whose electrical characteristics change when touched by a contact body, and a signal voltage corresponding to the electrical characteristics of the connected sensor electrodes connected to each of the sensor electrodes.
- Sensor output readout circuit for outputting as data, sensor control circuit for supplying a control signal to the sensor output readout circuit, and the sensor output readout circuit
- a coordinate calculation circuit that detects a position touched by the contact body in the touch sensor unit based on a signal voltage output from the touch sensor unit, and the sensor control circuit is configured to detect the position of the coordinate calculation circuit.
- a scan operation for outputting sensor data for a screen from the sensor output readout circuit is performed in a plurality of times so as not to overlap when the polarity of the common voltage is reversed, and the coordinate calculation circuit is divided into the plurality of times.
- a sensor output composition circuit that synthesizes sensor data obtained by a scan operation to generate sensor data for one screen, and the touch sensor unit based on sensor data for one screen generated by the sensor output composition circuit And a coordinate position detection circuit for detecting a position touched by the contact body.
- the scan operation for outputting the sensor data for one screen from the sensor output readout circuit is divided into a plurality of times so as not to overlap when the polarity of the common voltage is reversed, so that the common voltage is detected during the scan operation. Inversion of polarity does not occur. Thereby, the influence which the noise resulting from the polarity inversion of the common voltage of a display apparatus has on sensor data can be avoided without using a special circuit such as a strobe signal generation circuit or a noise cut current signal generation circuit.
- the display device with a touch sensor has a configuration in which the sensor control circuit performs the operation of sequentially connecting the sensor output readout circuit to all the sensor electrodes of the touch sensor unit by dividing the plurality of times. can do.
- the sensor control circuit repeatedly performs the operation of sequentially connecting the sensor output readout circuit to all of the sensor electrodes of the touch sensor unit within one cycle period of the common voltage, and the sensor output synthesis
- the circuit may generate the sensor data for the one screen by adding the sensor data obtained from the sensor output readout circuit a plurality of times.
- the sensor electrode includes a first sensor electrode group in which a plurality of the sensor electrodes are arranged in the first axis direction of the coordinate in the touch sensor unit, and A signal voltage output when the coordinate calculation circuit is connected to the sensor electrode belonging to the first sensor electrode group.
- the display device with a touch sensor may have a configuration in which the polarity of the common voltage is inverted every horizontal period, or a configuration in which the polarity of the common voltage is inverted every two horizontal periods. .
- FIGS. 1 and 2 are schematic views showing the configuration of the display device 20 with a touch sensor according to the first embodiment of the present invention.
- a display device 20 with a touch sensor includes an active matrix type (for example, TFT type) display panel 10, a touch sensor unit 7, and a drive circuit 14 that supplies various signals to the display panel 10. And a touch sensor circuit 16.
- the drive circuit 14 is connected to a source driver 12a and a gate driver 12b via an FPC (flexible circuit board) 13.
- the source driver 12a and the gate driver 12b may be mounted as a chip on the active matrix substrate 8 of the display panel 10, or may be formed monolithically on the active matrix substrate 8.
- a video signal, a horizontal synchronization signal H SYNC , a vertical synchronization signal V SYNC , a clock signal CLK (pixel clock), and the like are input to the drive circuit 14 via an external interface (I / F).
- the clock signal CLK may be generated by a PLL circuit inside the drive circuit 14, for example.
- the touch sensor circuit 16 is supplied with a vertical synchronization signal V SYNC , a horizontal synchronization signal H SYNC , and, if necessary, a clock signal CLK via the drive circuit 14 or directly from the outside.
- the display panel 10 has at least an active matrix substrate 8, a counter substrate 6, and a display medium layer 4 disposed between these substrates.
- the active matrix substrate 8 has a TFT array layer 3 including switching elements such as TFTs and wirings on the glass substrate 2.
- the active matrix substrate 8 has a plurality of pixel electrodes arranged in a matrix.
- the display medium layer 4 is, for example, a liquid crystal layer.
- the counter substrate 6 has a color filter (not shown) and a counter electrode 5 formed on the entire surface of the substrate.
- a polarizing plate is provided on at least one surface of the display panel 10.
- the first polarizing plate 1 (polarizer) is provided on the back side (the side opposite to the observer) of the active matrix substrate 8.
- a second polarizing plate (not shown) as an analyzer may be provided on the counter substrate 6 side.
- the display panel 10 is provided with the color filter and the second polarizing plate.
- the color filter and the second polarizing plate may be arranged on the viewer side of the touch sensor unit 7.
- the display panel 10 is provided with various optical members such as a phase difference plate and a lens sheet as necessary.
- the touch sensor unit 7 is disposed on the front surface (observer side) of the display panel 10.
- the touch sensor unit 7 includes, for example, a touch sensor substrate made of glass or transparent plastic, and a transparent conductive film provided on the surface of the touch sensor substrate.
- the transparent conductive film is formed in a predetermined pattern by a well-known thin film forming technique such as sputtering.
- the material of the transparent conductive film is, for example, indium / tin oxide (ITO), indium / zinc oxide (IZO), tin oxide (NESA), or zinc oxide.
- ITO indium / tin oxide
- IZO indium / zinc oxide
- NESA tin oxide
- zinc oxide zinc oxide.
- the material of the transparent conductive film and the film formation method are not particularly limited to the examples described here, and various materials and film formation methods can be used.
- the touch sensor unit 7 may be adhered to the surface of the display panel 10 with an adhesive or the like without a gap, or may be mounted with a gap (air layer). At this time, the transparent conductive film of the touch sensor unit 7 may be disposed on the display panel 10 side, and conversely, the touch sensor substrate may be disposed on the display panel 10 side.
- the touch sensor unit 7 may have a configuration without the touch sensor substrate.
- the touch sensor unit 7 in this case can be realized by directly forming a transparent conductive film on the outer surface of the display panel 10 on the viewer side. According to this configuration, there is an advantage that the thickness of the entire display device with a touch sensor can be reduced.
- the touch sensor unit 7 it is preferable to form a protective layer on the outermost surface on the viewer side regardless of whether or not the touch sensor substrate is provided.
- a protective layer for example, an inorganic thin film such as SiO 2 or SiNO X , a transparent resin coating, or a transparent resin film such as PET or TAC can be used.
- the touch sensor unit 7 may be further subjected to antireflection processing and / or antifouling processing as necessary.
- an active matrix type (for example, TFT type) liquid crystal display panel is used as the display panel 10.
- the polarity of the common voltage supplied to the counter electrode 5 of the counter substrate 6 is inverted every certain period (for example, one horizontal synchronization period). This is to prevent a DC voltage from being applied to the liquid crystal layer as the display medium layer 4 and to reduce the breakdown voltage required for the gate driver and the source driver.
- FIG. 3 is a diagram illustrating an example of a time change of the common voltage (COM voltage) applied to the counter electrode 5 of the display panel 10.
- the example of FIG. 3 is so-called line inversion driving in which the polarity (positive and negative) of the common voltage is inverted every horizontal synchronization period.
- the present invention is not limited to this, and can be applied to so-called two-line inversion driving or the like in which the polarity of the common voltage is inverted every two horizontal synchronization periods.
- FIG. 3 illustrates a common voltage waveform in which the absolute value of the positive voltage and the absolute value of the negative voltage are the same.
- the absolute value of the positive voltage of the common voltage is not necessarily equal to the absolute value of the negative voltage.
- the polarity of the common voltage is inverted from positive to negative or from negative to positive in synchronization with the fall of the horizontal synchronization signal (H SYNC ) (switch from high level to low level).
- H SYNC horizontal synchronization signal
- the scan operation of the electrode pattern in the touch sensor unit 7 is started in synchronization with the falling edge of the horizontal synchronization signal. This scanning operation will be described in detail later.
- FIG. 4A is a schematic diagram illustrating a configuration example in which only the transparent conductive film for detecting the touch position in the X direction is extracted from the transparent conductive film of the touch sensor unit 7.
- FIG. 4B is a schematic diagram illustrating a configuration example in which only the transparent conductive film for detecting the touch position in the Y direction is extracted from the transparent conductive film of the touch sensor unit 7.
- FIG. 4C is a schematic diagram illustrating the entire configuration of the transparent conductive film of the touch sensor unit 7.
- the transparent conductive film for detecting the touch position in the Y direction is illustrated with a sand pattern for convenience in order to easily distinguish it from the transparent conductive film in the X direction. did. That is, the actual transparent electrode film does not have such a pattern.
- the touch sensor unit 7 includes m electrode patterns 7X1, 7X2, ... 7Xm in the X direction and n electrode patterns 7Y1, 7Y2, ... 7Yn in the Y direction. And have.
- FIG. 4A and the like the illustration is simplified for easy understanding, but the number (m, n) of electrode patterns actually provided in the touch sensor unit 7 is necessary for the touch sensor unit 7. It is determined according to the sensor resolution.
- the touch sensor unit 7 of the present embodiment determines the X coordinate of the touch position by the electrode patterns 7X1, 7X2,... 7Xm, and determines the Y coordinate of the touch position by the electrode patterns 7Y1, 7Y2,.
- the X-direction electrode patterns 7X1, 7X2,... 7Xm and at least one of the Y-direction electrode patterns 7Y1, 7Y2, are arranged at such a density that the contact object simultaneously touches the book.
- each of the electrode patterns 7X1 to 7Xm and the electrode patterns 7Y1 to 7Yn has a conductive wiring patterned in a plurality of rectangular shapes, and conductive wiring is arranged so that the vertices of the rectangles face each other. Through a pattern connected in series.
- the conductive wiring may be formed of the same material as the conductive film or may be formed of another conductive material.
- the conductive wiring is led out of the touch sensor unit 7 and connected to a sensor output readout circuit described later.
- the X-direction electrode patterns 7X1, 7X2,... 7Xm and the Y-direction electrode patterns 7Y1, 7Y2,. Has been placed.
- An insulating film is interposed between these wirings so as not to be electrically connected to the wirings.
- the configuration of the conductive film of the touch sensor unit 7 is not limited to the example shown in FIG. 4C.
- the electrode pattern in the X direction and the electrode pattern in the Y direction may be configured to overlap each other.
- the electrode pattern in the X direction and the electrode pattern in the Y direction may be formed in different layers with the insulating film layer interposed therebetween.
- an insulating film may be interposed at least between the X-direction electrode pattern and the Y-direction electrode pattern where these patterns overlap.
- FIG. 5 is a circuit diagram showing an internal configuration of the touch sensor circuit 16.
- the touch sensor circuit 16 includes a sensor output reading circuit 21, a coordinate calculation device 22, and a switch control device 23 (sensor control circuit).
- the sensor output readout circuit 21 outputs signals representing the capacitances of the electrode patterns 7X1, 7X2,... 7Xm and the electrode patterns 7Y1, 7Y2,. Based on the output signal value from the sensor output readout circuit 21, the coordinate calculation device 22 is in a position where the contact body is in contact with the electrode patterns 7X1, 7X2,... 7Xm and the electrode patterns 7Y1, 7Y2,. Find the coordinates of.
- the switch control device 23 controls the operation of the sensor output reading circuit 21 by supplying control signals to various switches of the sensor output reading circuit 21.
- the sensor output readout circuit 21 includes a multiplexer 211, a compensation circuit 212, a charging circuit 213, and a current-voltage conversion circuit 214.
- the multiplexer 211 selectively connects the outputs from the electrode patterns 7X1, 7X2,... 7Xm of the touch sensor unit 7 and the electrode patterns 7Y1, 7Y2,. Selection of the electrode pattern in the multiplexer 211 is controlled by a selection signal Smp supplied from the switch control device 23. In the present embodiment, as will be described in detail later, the multiplexer 211 selects the electrode patterns 7X1, 7X2,... 7Xm in the preceding horizontal synchronization period out of two consecutive horizontal synchronization periods, and the two horizontal In the subsequent horizontal synchronization period of the synchronization period, the electrode patterns 7Y1, 7Y2,... 7Yn are selected.
- the charging circuit 213 includes switching elements SW1 and SW2.
- the switching element SW1 switches connection and disconnection between the terminal T1 of the charging circuit 213 and the current-voltage conversion circuit 214.
- the switching element SW2 switches connection and disconnection between the terminal T1 and the ground voltage. Switching of the switching elements SW1 and SW2 is controlled by control signals Sa and Sb supplied from the switch control device 23.
- the compensation circuit 212 includes a capacitor Cc and switching elements SW6 and SW7.
- the switching element SW6 switches between connection and non-connection between one terminal of the capacitor Cc and a power supply terminal to which a voltage (V 0 + V REF ⁇ 2) is applied.
- Switching element SW7 switches connection and disconnection between one terminal of capacitor Cc and switching element SW1 of charging circuit 213.
- the other terminal of the capacitor Cc is held at the ground potential.
- the capacitance of the capacitor Cc is set to the same capacitance as the parasitic capacitance Ca formed between the electrode pattern of the touch sensor unit 7 and the terminal T1 of the charging circuit 213.
- the compensation circuit 212 supplies the same current i3 to the touch sensor unit 7 via the switching element SW1 in order to compensate the current i3 flowing through the parasitic capacitance Ca.
- the current-voltage conversion circuit 214 includes a capacitor C1, a differential amplifier OP1, and switching elements SW3, SW4, SW5.
- the capacitor C1 functions as a charge storage unit for storing charges.
- One terminal of the capacitor C1 is connected to one of the two input terminals of the differential amplifier OP1.
- the other input terminal of the differential amplifier OP1 is connected to a power supply terminal VS1 to which a voltage VREF is applied.
- the other terminal of the capacitor C1 is connected to the output terminal of the differential amplifier OP1.
- the switching element SW3 switches between connection and non-connection between the terminal of the capacitor C1 on the side connected to the input terminal of the differential amplifier OP1 and the power supply terminal VS1 to which the voltage VREF is applied.
- the switching element SW4 switches between connection and non-connection between both terminals of the capacitor C1. Switching of the switching elements SW3 and SW4 is controlled by a control signal Sc supplied from the switch control device 23.
- the switching element SW5 switches between connection and non-connection between the output terminal of the differential amplifier OP1 and the coordinate calculation device 22. Switching of the switching element SW5 is controlled by a control signal Sd supplied from the switch control device 23.
- the coordinate calculation device 22 includes a sensor output synthesis circuit 221 and a contact position detection circuit 222 (coordinate position detection circuit).
- the sensor output combining circuit 221 which will be described in detail later, combines the sensor outputs partially obtained by each of a plurality of scans by the sensor output reading circuit 21 and detects a coordinate position for one screen.
- the data is supplied to the contact position detection circuit 222 as data.
- the “sensor data for one screen” here is read from each of the electrode patterns 7X1, 7X2,... 7Xm and the electrode patterns 7Y1, 7Y2,. (M + n) capacitance values.
- the contact position detection circuit 222 calculates the coordinates of the position touched by the pen, finger, etc. based on the sensor data generated by the sensor output synthesis circuit 221.
- the switch control device 23 turns on the switching elements SW2, SW3, SW4, and SW6 and turns off the switching elements SW1, SW5, and SW7.
- the voltage at the terminal T1 is set to V 0 (ground voltage)
- the potential difference between both terminals of the capacitor Cc is set to V 0 + 2V REF .
- both terminals of the capacitor C1 are set to the same voltage VREF .
- the potential difference between both terminals of the capacitor C1 is 0V.
- the switch control device 23 turns on the switching elements SW1, SW5 and SW7 and turns off the switching elements SW2, SW3, SW4 and SW6.
- the capacitor C1 and the electrode pattern selected by the multiplexer 211 among the electrode patterns of the touch sensor unit 7 are connected.
- a contact body such as a finger or a pen is in contact with the electrode pattern
- a current flows through the contact body, and the amount of charge accumulated in the capacitor C1 changes.
- the current i3 flowing through the parasitic capacitance Ca is compensated by the same current i3 flowing from the capacitor Cc.
- the differential amplifier OP1 outputs a voltage signal corresponding to the amount of charge accumulated in the capacitor C1.
- the terminal T3 of the current-voltage conversion circuit 214 has different voltages depending on whether or not the contact body is in contact with the electrode pattern of the touch sensor unit 7 and the difference in the dielectric constant of the contact body. A signal is output.
- the coordinate calculation device 22 can detect whether or not the contact body is in contact with the electrode pattern of the touch sensor unit 7 in accordance with the output signal from the terminal T3 of the current-voltage conversion circuit 214. For example, the value of the output signal from the terminal T3 of the current-voltage conversion circuit 214 when nothing is in contact with the electrode pattern of the touch sensor unit 7 is measured and stored in advance, and the value and the value of the output signal are stored. The presence or absence of contact can be detected.
- the coordinate calculation device 22 includes a memory (not shown) that stores the value of the output signal from the terminal T3 of the current-voltage conversion circuit 214.
- the multiplexer 211 has a total (m + n) of the X-direction electrode patterns 7X1, 7X2,... 7Xm and the Y-direction electrode patterns 7Y1, 7Y2,.
- the electrode patterns are sequentially selected. That is, here, all the scans of the electrode pattern are completed in two horizontal synchronization periods. In other words, one sensor cycle is two horizontal synchronization periods. Thereby, (m + n) signal values are obtained as output signals from the terminal T3 of the current-voltage conversion circuit 214 in one sensor cycle.
- the coordinate calculation device 22 detects the contact position by the contact body based on these (m + n) signal values. For example, if it is determined that the electrode pattern 7X1 is in contact with the electrode patterns 7X1, 7X2,... 7Xm in the X direction and the electrode pattern 7Y1 in the Y direction is also in contact, It can be determined that a finger, a pen, or the like is in contact with the vicinity of the intersection of the electrode pattern 7X1 and the electrode pattern 7Y1 in the Y direction. Note that the number of contact points detected in one sensor cycle is not limited to one.
- FIG. 6 is a flowchart showing an example of the operation of the touch sensor circuit 16.
- step S1 As shown in FIG. 6, when the power is turned on, the operation of the touch sensor circuit 16 starts. First, various initial values are set (step S1).
- the multiplexer 211 sequentially selects the X-direction electrode patterns 7X1, 7X2,... 7Xm in accordance with the control signal Smp from the switch control device 23. Thereby, these electrode patterns are sequentially connected to the charging circuit 213, whereby m output signal values corresponding to the capacitance of each electrode pattern are obtained (step S2).
- the m output signal values obtained in step S2 are stored in a memory (not shown) inside or outside the coordinate calculation device 22.
- the switch control device 23 synchronizes with the falling of one pulse 51 of the horizontal synchronization signal H SYNC (switching from the high level to the low level). Start selection. Note that the readout of the capacitance from the electrode patterns 7X1, 7X2,... 7Xm is completed within one horizontal synchronization period as shown in FIG.
- the multiplexer 211 synchronizes with the falling edge of the pulse 52 next to the pulse 51 in the horizontal synchronization signal H SYNC in response to the control signal Smp from the switch control device 23, so that the electrode patterns 7Y1, 7Y2,. -Start sequential selection of 7Yn. Accordingly, these electrode patterns are sequentially connected to the charging circuit 213, whereby n output signal values corresponding to the capacitance of each electrode pattern are obtained (step S3).
- the n output signal values obtained in step S3 are stored in a memory (not shown) inside or outside the coordinate calculation device 22. Further, reading of the capacitance from the electrode patterns 7Y1, 7Y2,... 7Yn is also completed within one horizontal synchronization period as shown in FIG.
- the memory stores m output signal values obtained in the scan in step S2 and n output signal values obtained in the scan in step S3. Will be.
- the sensor output combining circuit 221 has the m output signal values obtained by the scan in step S2 and the n output signal values obtained by the scan in step S3 from the memory. Are sequentially read and provided to the contact position detection circuit 222 as sensor data for one screen (step S4).
- the contact position detection circuit 222 compares the signal value given from the sensor output synthesis circuit 221 in step S6 with a predetermined threshold value, thereby determining the coordinates of the position touched by the contact body. Is obtained (step S5).
- the predetermined threshold value is obtained by adding a margin as necessary to the output signal value of the sensor output readout circuit 21 when nothing is in contact with the electrode pattern, for example.
- steps S2 to S5 are repeated.
- the touch sensor circuit 16 takes two cycles (two horizontal synchronization periods) of the horizontal synchronization signal H SYNC as one sensor cycle, and the preceding horizontal synchronization period is the preceding horizontal synchronization period.
- the synchronization period output signal values are acquired from the electrode patterns 7X1, 7X2,.
- the touch sensor circuit 16 acquires an output signal value from the electrode patterns 7Y1, 7Y2,... 7Yn in the subsequent horizontal synchronization period of the two horizontal synchronization periods. That is, at the time when the polarity of the common voltage (COM voltage) is switched during the two horizontal synchronization periods, the capacitance is not read from the electrode pattern. Therefore, according to this embodiment, it is possible to obtain a sensor output with a high S / N ratio that does not include noise due to the polarity inversion of the common voltage.
- output signal values are acquired from the electrode patterns 7X1, 7X2,... 7Xm in the preceding horizontal synchronization period of the two horizontal synchronization periods constituting one sensor cycle, and the subsequent horizontal synchronization period.
- the output signal value is obtained from the electrode patterns 7Y1, 7Y2,... 7Yn.
- output signal values are acquired from the electrode patterns 7Y1, 7Y2,... 7Yn in the preceding horizontal synchronization period of the two horizontal synchronization periods, and the electrode patterns 7X1, 7X2,. -You may make it acquire an output signal value from 7Xm.
- the output signal value is acquired from the X-direction electrode patterns (m), and in the subsequent horizontal synchronization period.
- the output signal value is obtained from the electrode patterns (n pieces) in the Y direction.
- the number of electrode patterns for reading the output signal value in each of the two horizontal synchronization periods is not limited to this example as long as the total of the two horizontal synchronization periods is (m + n).
- output signal values are obtained from a total of (m + n) electrode patterns in two horizontal synchronization periods.
- the output signal value from the electrode pattern may be acquired by dividing into three or more horizontal synchronization periods.
- the output signal value is repeatedly read from the electrode pattern with two horizontal synchronization periods as one sensor cycle. That is, in the example of FIG. 7, coordinate calculation based on the output signal value read in one sensor cycle is performed in the same sensor cycle or in parallel with the next sensor cycle. However, as shown in FIG. 8, coordinate calculation based on the output signal value read in one sensor cycle may be performed within the next horizontal synchronization period. In the example of FIG. 8, there are alternately two horizontal synchronization periods p1 and p2 in which the output signal value is read from the electrode pattern and horizontal synchronization period p3 in which the coordinate calculation is performed without reading from the electrode pattern. To do.
- the configuration of the display device with a touch sensor according to the second embodiment is the same as that of the display device with a touch sensor 20 according to the first embodiment. However, in the display device with a touch sensor according to the second embodiment, the operation of the touch sensor circuit 16 is different from that of the first embodiment.
- m electrode patterns are used in the first horizontal synchronization period, and n electrode patterns are used in the second horizontal synchronization period.
- signal values are read from (m + n) electrode patterns per horizontal synchronization period, but sensor data for one screen is obtained by adding signal values of two horizontal periods. Get. That is, in the first embodiment and the second embodiment, assuming that the length of the horizontal synchronization period is the same, in the second embodiment, the operating frequency of the multiplexer 211 is higher than in the first embodiment.
- the capacity read out in one scan is small. Thus, if the capacitance read in one scan is small, the dynamic range of the sensor output is narrowed. Therefore, by adding the capacitance obtained in two scans, a sensor output with a wide dynamic range is obtained.
- FIG. 9 is a flowchart showing the operation of the touch sensor circuit 16 according to the present embodiment. As shown in FIG. 9, the operation of the touch sensor circuit 16 starts when the power is turned on. First, various initial values are set (step S11).
- the multiplexer 211 sequentially selects the electrode patterns 7X1, 7X2,... 7Xm in the X direction according to the control signal Smp from the switch control device 23. Thereby, m output signal values corresponding to the capacities of these electrode patterns are obtained (step S12).
- these output signal values are referred to as D1X1, D1X2,... D1Xm.
- These output signal values are stored in an internal or external memory (not shown) of the coordinate calculation unit 22 as output signal values in the X direction obtained in the first scan.
- the switch control device 23 starts the selection of the electrode pattern by the multiplexer 211 in synchronization with the falling edge of the pulse 51 of the horizontal synchronization signal H SYNC as shown in FIG.
- the multiplexer 211 sequentially selects the electrode patterns 7Y1, 7Y2,... 7Yn in the Y direction sequentially by the control signal Smp from the switch control device 23. Thereby, n output signal values corresponding to the capacities of these electrode patterns are obtained (step S13).
- these output signal values are referred to as D1Y1, D1Y2,... D1Yn.
- These output signal values are stored in an internal or external memory (not shown) of the coordinate calculation device 22 as output signal values in the Y direction obtained in the first scan. Note that the processing of step S12 and step S13 is performed within the same horizontal synchronization period.
- the multiplexer 211 sequentially selects the electrode patterns 7X1, 7X2,... 7Xm in the X direction again by the control signal Smp from the switch control device 23. Thereby, m output signal values corresponding to the capacities of these electrode patterns are obtained (step S14).
- these output signal values are referred to as D2X1, D2X2,... D2Xm.
- These output signal values are stored as data in the X direction obtained in the second scan in a memory (not shown) inside or outside the coordinate calculation device 22.
- the switch controller 23 uses the multiplexer 211 in synchronization with the falling edge of the pulse 52 next to the pulse 51 that triggers the scan start in step S12. The selection of the electrode pattern is started.
- the multiplexer 211 sequentially selects the electrode patterns 7Y1, 7Y2,... 7Yn in the Y direction sequentially by the control signal Smp from the switch control device 23. Thereby, n output signal values corresponding to the capacities of these electrode patterns are obtained (step S15).
- these output signal values are referred to as D2Y1, D2Y2,... D2Yn.
- These output signal values are stored as data in the Y direction obtained in the second scan in a memory (not shown) inside or outside the coordinate calculation device 22. Note that the processing of step S14 and step S15 is performed within the same horizontal synchronization period.
- the memory has (m + n) output signal values obtained in the first scan and (m + n) output signal values obtained in the second scan. Is stored.
- the sensor output composition circuit 221 of the coordinate calculation device 22 refers to the memory and adds the X-direction data obtained by the first scan and the X-direction data obtained by the second scan. To do. Further, the sensor output synthesis circuit 221 adds the Y direction data obtained by the first scan and the Y direction data obtained by the second scan (step S16).
- step S16 the sensor output composition circuit 221 outputs a value obtained by adding D1Xi and D2Xi as an output signal value of the electrode pattern 7Xi, where i is an integer from 1 to m. Further, the sensor output combining circuit 221 outputs a value obtained by adding D1Yj and D2Yj as an output signal value of the electrode pattern 7Yj, where j is an integer from 1 to n. Thereby, a signal value corresponding to the sum of the capacitance at the first scan and the capacitance at the second scan can be obtained for each electrode pattern.
- the sensor output synthesis circuit 221 uses the capacity at the time of the first scan and the capacity at the time of the second scan. By adding the capacitance, an output signal value having a wide dynamic range equivalent to 16 bits can be obtained.
- the contact position detection circuit 222 of the coordinate calculation device 22 determines the coordinates of the position touched by the contact body by comparing the output signal value obtained in step S16 with a predetermined threshold (step S17).
- the predetermined threshold value is obtained by adding a margin as necessary to the output signal value of the sensor output readout circuit 21 when nothing is in contact with the electrode pattern, for example.
- the sensor output combining circuit 221 generates sensor data for one screen by adding the output signal values of two horizontal synchronization periods.
- the output signal value from the electrode pattern may be acquired by adding the output signal values of three or more horizontal synchronization periods.
- the output signal value is repeatedly read from the electrode pattern with two horizontal synchronization periods as one sensor cycle. That is, in the example of FIG. 10, the coordinate calculation based on the output signal value read in one sensor cycle is performed in the same sensor cycle or in parallel with the next sensor cycle. However, as shown in FIG. 11, the coordinate calculation based on the output signal value read in one sensor cycle may be performed within the next horizontal synchronization period. That is, in the example of FIG. 11, horizontal synchronization periods p1 and p2 in which output signal values are read from (m + n) electrode patterns, respectively, and a horizontal synchronization period p3 in which coordinate calculation is performed without reading from the electrode patterns. And alternately exist.
- the configuration in which the contact position is detected by utilizing the change in the capacitance of the electrode pattern when a finger, a pen, or the like comes into contact is illustrated.
- the configuration of the touch sensor unit is not limited to such a capacitive coupling method, and any other method can be applied.
- the present invention is not limited to a contact type sensor, and the present invention can be applied to a sensor that electrically or optically detects that a finger, a pen, or the like is in proximity.
- the electrode patterns 7X1, 7X2,... 7Xm and the electrode patterns 7Y1, 7Y2,... 7Yn are sequentially selected in one sensor cycle using one multiplexer. . That is, in the above description, a configuration in which one sensor output readout circuit 21 is provided in the touch sensor circuit 16 is illustrated. However, one sensor output readout circuit 21 may be provided for each of the electrode patterns 7X1, 7X2,... 7Xm and the electrode patterns 7Y1, 7Y2,. According to this configuration, it is possible to scan the electrode patterns 7X1, 7X2,... 7Xm and the electrode patterns 7Y1, 7Y2,.
- one sensor cycle is constituted by two or more horizontal synchronization periods, and the capacitance is read from the electrode pattern at the time when the polarity of the common voltage is switched as in the first embodiment or the second embodiment.
- the example in which the polarity of the common voltage is switched every horizontal synchronization period has been shown.
- the present invention can also be implemented as an inversion drive configuration. Also in this case, by not performing capacitance reading from the electrode pattern at the time when the polarity of the common voltage is switched, it is possible to obtain a sensor output that does not include noise caused by polarity inversion of the common voltage.
- the present invention can be used industrially as a display device with a touch sensor.
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Abstract
Description
以下、図面を参照し、本発明の実施の形態を詳しく説明する。図中同一又は相当部分には同一符号を付してその説明は繰り返さない。
図1および図2は、本発明の第1の実施形態にかかるタッチセンサ付き表示装置20の構成を示す模式図である。
本発明の第2の実施形態にかかるタッチセンサ付き表示装置について、図面を参照しながら以下に説明する。なお、第1の実施形態と同じ機能を有する構成については、同じ参照符号を付記し、その詳細な説明を省略する。
Claims (6)
- 複数の画素電極を備えるアクティブマトリクス基板と、表示媒体層と、前記複数の画素電極に対向する対向電極を備える対向基板とを有する表示パネルと、
前記複数の画素電極に表示信号電圧を供給するとともに、前記対向電極に極性の周期的な反転を伴う共通電圧を供給する表示パネル駆動回路と、
前記表示パネルの対向基板側の表面に配置され、接触体が触れたときに電気特性が変化するセンサ電極を複数備えたタッチセンサ部と、
前記センサ電極のそれぞれに順次接続され、接続されたセンサ電極の電気特性に応じた信号電圧をセンサデータとして出力するセンサ出力読出回路と、
前記センサ出力読出回路へ制御信号を供給するセンサ制御回路と、
前記センサ出力読出回路から出力される信号電圧に基づいて、前記タッチセンサ部において前記接触体が触れた位置を検出する座標演算回路とを備え、
前記センサ制御回路が、前記座標演算回路が位置検出を行うための1画面分のセンサデータを前記センサ出力読出回路から出力させるスキャン動作を、前記共通電圧の極性の反転時に重ならないよう複数回に分割して行い、
前記座標演算回路が、
前記複数回に分割されたスキャン動作により得られたセンサデータを合成して1画面分のセンサデータを生成するセンサ出力合成回路と、
前記センサ出力合成回路で生成された1画面分のセンサデータに基づいて、前記タッチセンサ部において前記接触体が触れた位置を検出する座標位置検出回路とを備えた、タッチセンサ付き表示装置。 - 前記センサ制御回路が、前記タッチセンサ部のセンサ電極の全てへ当該センサ出力読出回路を順次接続する動作を、前記複数回に分割して行う、請求項1に記載のタッチセンサ付き表示装置。
- 前記センサ制御回路が、前記共通電圧の1周期期間内に前記タッチセンサ部のセンサ電極の全てへ当該センサ出力読出回路を順次接続する動作を、前記複数回繰り返して行い、
前記センサ出力合成回路が、前記複数回にわたって前記センサ出力読出回路から得られたセンサデータを加算することにより、前記1画面分のセンサデータを生成する、請求項1に記載のタッチセンサ付き表示装置。 - 前記センサ電極が、前記タッチセンサ部において座標の第1軸方向に複数並んだ第1のセンサ電極群と、前記タッチセンサ部において座標の第2軸方向に複数並んだ第2のセンサ電極群とを含み、
前記座標演算回路が、前記センサ出力読出回路が前記第1のセンサ電極群に属するセンサ電極に接続された際に出力した信号電圧に基づいて、前記接触体が触れた位置の第1軸方向の座標を決定し、前記センサ出力読出回路が前記第2のセンサ電極群に属するセンサ電極に接続された際に出力した信号電圧に基づいて、前記接触体が触れた位置の第2軸方向の座標を決定する、請求項1~3のいずれか一項に記載のタッチセンサ付き表示装置。 - 前記共通電圧の極性が1水平期間毎に反転する、請求項1~4のいずれか一項に記載のタッチセンサ付き表示装置。
- 前記共通電圧の極性が2水平期間毎に反転する、請求項1~4のいずれか一項に記載のタッチセンサ付き表示装置。
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