WO2010098199A1 - 表示装置、タッチパネル、および電子機器 - Google Patents
表示装置、タッチパネル、および電子機器 Download PDFInfo
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- WO2010098199A1 WO2010098199A1 PCT/JP2010/051816 JP2010051816W WO2010098199A1 WO 2010098199 A1 WO2010098199 A1 WO 2010098199A1 JP 2010051816 W JP2010051816 W JP 2010051816W WO 2010098199 A1 WO2010098199 A1 WO 2010098199A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3262—Power saving in digitizer or tablet
-
- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13456—Cell terminals located on one side of the display only
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04101—2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
-
- 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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
Definitions
- the present invention relates to a touch panel for detecting an external proximity object, a display device incorporating such a touch panel, and an electronic device.
- a touch detection device called a touch panel is mounted on a display device such as a liquid crystal display device, and various button images are displayed on the display device, so that information can be input instead of a normal mechanical button.
- the display device which attracted attention attracts attention.
- a display device having such a touch panel does not require an input device such as a keyboard, a mouse, or a keypad. Therefore, the display device tends to be used not only for a computer but also for a portable information terminal such as a mobile phone.
- Patent Document 1 discloses a display device in which an optical touch panel having two operation modes (a normal operation mode and a low power consumption mode) is integrated with a liquid crystal display panel.
- the touch panel operates in the normal operation mode while the user inputs information by touch, and shifts to the low power consumption mode when the touch is not detected for a predetermined time.
- this low power consumption mode power consumption is reduced by reducing the frequency of touch detection operations on the touch panel. Thereafter, when a touch is detected in the low power consumption mode, the low power consumption mode is restored to the normal operation mode, and the user can input information again by the touch.
- Patent Document 2 in a display device in which an optical touch panel having a normal operation mode and a low power consumption mode is integrated with a liquid crystal display panel, the frequency of the touch detection operation is reduced in the low power consumption mode.
- a display device that reduces power consumption by setting only a circuit that calculates a touch position to a sleep state is disclosed.
- the display device of the present invention includes a plurality of display elements, a plurality of sensor elements, a detection unit, a transfer output unit, and a control unit.
- the plurality of display elements perform display based on the video signals respectively supplied to the plurality of video signal lines.
- the plurality of sensor elements respectively output touch signals indicating the presence of external proximity objects to the plurality of sensor signal lines.
- the detection unit detects each touch signal.
- the transfer output unit transfers and outputs the detection result of the detection unit to the outside.
- the control unit controls the operation of the detection unit and the transfer output unit, operates the transfer output unit when a touch signal is detected in the detection unit, and stops the operation of the transfer output unit when no touch signal is detected.
- the transfer detection unit preferably converts the detection result of the detection unit from parallel to serial and transfers and outputs the result.
- the touch panel of the present invention includes a plurality of sensor elements and a sensor detection circuit.
- the plurality of sensor elements output touch signals indicating external proximity objects to the plurality of sensor signal lines, respectively.
- the sensor detection circuit detects an external proximity object based on the touch signal, and includes a detection unit, a transfer output unit, and a control unit.
- the detection unit detects each touch signal.
- the transfer output unit transfers and outputs the detection result of the detection unit to the outside.
- the control unit controls the operation of the detection unit and the transfer output unit, operates the transfer output unit when a touch signal is detected in the detection unit, and stops the operation of the transfer output unit when no touch signal is detected.
- the transfer detection unit preferably converts the detection result of the detection unit from parallel to serial and transfers and outputs the result.
- the electronic apparatus includes the display device according to the present invention, and includes, for example, a television set, a digital camera, a personal computer, a video camera, or a mobile terminal device such as a mobile phone.
- the detection unit detects a touch signal supplied from the touch sensor via the sensor signal line.
- the control unit always monitors the presence or absence of the touch signal in the detection unit, and only when the detection unit detects the touch signal, the transfer output unit transfers the detection result to the outside and the touch signal is not detected. Is controlled so that the transfer output unit does not perform this operation.
- the detection unit divides the entire touch detection region in which the plurality of sensor elements are arranged into a plurality of regions, and sequentially detects the touch signal for each region, and the control unit detects among the plurality of regions. It is desirable to operate so as to stop the operation of the transfer output unit in the period corresponding to the region where the touch signal is not detected.
- the control unit for example, when the touch signal is not detected in the detection unit for a predetermined period, the control unit also stops a part of the detection operation of the detection unit. Is possible.
- the control unit detects the touch signal when the detection unit does not detect the touch signal over a predetermined period.
- the operation frequency may be reduced.
- the control unit counts the number of frames for video display, and when the touch signal is not detected in the detection unit over a period of one or a plurality of frames, the operation frequency in the detection unit and the transfer output unit is lowered, and then the touch signal When the value is detected, the count value of the count operation may be reset to restore the lowered operation frequency.
- the first operation mode in which the control unit operates the detection unit and the transfer output unit every predetermined number of frames when the detection unit does not detect a touch signal over a period of one or a plurality of frames.
- the touch signal can be configured to shift to the second operation mode in which the detection unit and the transfer output unit are operated in all frames.
- an initialization unit that shares a sensor signal line with a video signal line and applies an initialization signal to all of the plurality of sensor signal lines simultaneously in the initialization period.
- the detection unit may detect the touch signal in a period other than the video signal application period in which the video signal is applied to the sensor signal line in the period following the initialization period.
- the control unit generates a start signal when a touch signal is detected by the detection unit, and then generates a stop signal when an initialization signal is applied by the initialization unit; Based on the start signal and the stop signal, it can be configured to include a transfer clock signal applied to the transfer output unit and an operation signal control unit for generating and controlling a detection start signal applied to the detection unit.
- a liquid crystal display element and a contact sensor element configured to share the pixel electrode and the drive electrode can be used. That is, the display element corresponds to a potential difference between a pixel electrode to which a video signal is supplied, a drive electrode to which a common signal commonly applied to a plurality of display elements is supplied, and a voltage between the pixel electrode and the drive electrode.
- the liquid crystal display element has a liquid crystal layer that is driven.
- the sensor element is a contact type sensor element configured by a pixel electrode and a drive electrode. In this case, the detection unit can detect, as a touch signal, a voltage change of the sensor signal line that occurs as a result of the pixel electrode and the drive electrode approaching or contacting each other due to pressing by an external proximity object.
- the liquid crystal can be driven by polarity inversion driving in which the polarity of the potential difference is inverted every certain period.
- the initialization signal a signal based on a common signal whose potential changes every certain period is used, and the detection result of the detection unit based on the initialization signal is detected between the detection unit and the control signal generation unit. It is preferable to insert a logic gate circuit that generates valid logic and outputs it to the control signal generator.
- the sensor element has, for example, an electrode that forms a capacitance, and the sensor signal line is based on the capacitance that changes according to an external proximity object. It is also possible to use a capacitive sensor element that outputs a signal.
- the sensor element has a light receiving element that detects light and outputs a signal corresponding to the amount of light, and outputs a signal to the sensor signal line based on the output signal of the light receiving element that changes according to an external proximity object. It may be an optical sensor element.
- the display element may be, for example, an EL display element.
- the detection unit is always operated, and the operation of the transfer output unit is controlled according to the touch detection state. Response performance can be realized.
- FIG. 2 is a block diagram illustrating a configuration example of a sensor readout circuit illustrated in FIG. 1.
- FIG. 3 is a circuit diagram illustrating a configuration example of a D-type flip-flop (DFF) illustrated in FIG. 2.
- DFF D-type flip-flop
- FIG. 3 is a circuit diagram illustrating a configuration example of a transfer clock control circuit 37 illustrated in FIG. 2.
- FIG. 3 is a timing waveform diagram illustrating an operation example of the display device illustrated in FIG. 2. It is a block diagram showing the example of 1 structure of the sensor read-out circuit concerning a comparative example.
- FIG. 1 is a comparative example.
- FIG. 10 is a timing waveform diagram illustrating an operation example of a display device according to a comparative example. It is a schematic diagram showing the example of 1 structure of the display apparatus which concerns on a modification. It is a block diagram showing the example of 1 structure of the sensor read-out circuit concerning the 2nd Embodiment of this invention.
- FIG. 10 is a timing waveform diagram illustrating an operation example of the display device illustrated in FIG. 9. It is a block diagram showing the example of 1 structure of the sensor read-out circuit concerning the 3rd Embodiment of this invention.
- FIG. 12 is a timing waveform diagram illustrating an operation example of the sensor readout circuit illustrated in FIG. 11.
- FIG. 12 is a schematic diagram illustrating an operation example of the display device using the sensor readout circuit illustrated in FIG. 11.
- FIG. 15 is a block diagram illustrating a configuration example of a sensor readout circuit illustrated in FIG. 14. It is a perspective view showing the appearance composition of application example 1 among display devices with a touch sensor to which an embodiment is applied.
- 12 is a perspective view illustrating an appearance configuration of an application example 2.
- FIG. 12 is a perspective view illustrating an appearance configuration of an application example 3.
- FIG. 14 is a perspective view illustrating an appearance configuration of an application example 4.
- FIG. FIG. 10 is a front view, a side view, a top view, and a bottom view illustrating an appearance configuration of an application example 5.
- FIG. 22 is a circuit diagram illustrating a configuration example of a display cell illustrated in FIG. 21. It is a schematic diagram showing the display apparatus which concerns on the other modification of the 1st to 3rd embodiment of this invention. It is a schematic diagram showing the touchscreen which concerns on the other modification of the 1st to 3rd embodiment of this invention.
- FIG. 1 shows a configuration example of a display device according to the first embodiment of the present invention.
- the display device 1 is a so-called in-cell type display device in which a display panel and a touch panel are integrated, and includes a liquid crystal element as a display element and a contact type touch sensor as a touch sensor element.
- the display device 1 includes a display panel 1P and a panel interface unit 1IO.
- the display panel 1P is a liquid crystal display panel, and displays a video based on a video signal supplied via the panel interface unit 1IO.
- the region illustrated as the display panel 1P corresponds to the size of the drive substrate.
- the display panel 1P includes a display unit 2, source drivers 6A and 6B, sensor readout circuits 3A and 3B, and a vertical drive circuit 4.
- the source driver 6 is appropriately used as a generic term for the source drivers 6A and 6B
- the sensor readout circuit 3 is appropriately used as a generic term for the sensor readout circuits 3A and 3B.
- the display unit 2 indicates a display area where the display is actually performed, and the region illustrated as the display unit 2 in FIG. 1 corresponds to the size of the counter substrate facing the drive substrate.
- the pixels PIX are arranged in a matrix.
- the pixel PIX includes a select transistor ST, a liquid crystal element LC, and a touch sensor TS.
- the select transistor ST is disposed on the driving substrate, and is formed from, for example, a TFT (Thin FilmorTransistor).
- the select transistor ST has one of a source and a drain connected to a signal line SGL (described later) and the other connected to a pixel electrode (not shown) to drive the liquid crystal element LC and to the touch sensor TS.
- the gate of the select transistor ST is connected to a gate control line GCL (described later).
- the liquid crystal element LC is a display element that performs display based on a signal (pixel signal) supplied via a select transistor ST by a source driver 6 (described later). Specifically, the liquid crystal element LC performs display based on a potential difference between a pixel signal supplied to the pixel electrode and a common drive signal COM supplied to a common electrode provided in common to all the pixels.
- the common drive signal COM is a DC signal, and in this example, the DC voltage is set to 0V.
- liquid crystal is injected between a counter substrate (corresponding to the display unit 2) and a driving substrate (corresponding to the display panel 1P) to form a liquid crystal layer.
- the layer thickness of the liquid crystal layer is kept constant by the spacer.
- the outer peripheral side of the side surface between the substrates is closed by a sealant so that the liquid crystal does not leak from the liquid crystal layer.
- a color filter or the like is previously formed on the counter substrate, and a protective layer is formed on the surface.
- the touch sensor TS outputs a touch signal indicating the presence of an external proximity object and supplies it to a sensor reading circuit 3 (described later) via a select transistor ST.
- touch sensors are roughly classified into a resistance type, a capacitance type, and an optical type.
- the touch sensor system is not limited.
- a method in which a potential change occurs in the signal line SGL according to contact (or proximity) to the panel surface for example, a resistance switch method is assumed.
- the touch sensor TS shown in FIG. 1 is turned on by a touch operation on the panel surface.
- the touch sensor TS include, for example, TN (twisted nematic), VA (vertical orientation), and ECB (electric field control birefringence) in which a pixel electrode is formed on a driving substrate and a common electrode is formed on a counter substrate.
- a contact type touch sensor using a resistance between the pixel electrode (switch electrode) and the common electrode by forming a contact type switch with the pixel electrode and the common electrode facing each other can be used.
- this contact-type touch sensor when this contact-type touch sensor is used, as a result of pressing by an external proximity object, the pixel electrode (switch electrode) and the common electrode are in contact with each other in the pixel corresponding to the contacted position, and the touch sensor TS is in contact with that contact. A corresponding signal is output.
- the touch sensor TS does not necessarily include all the pixels PIX. That is, the pixel PIX may have, for example, two or more pixels PIX with the touch sensor TS in the horizontal direction in FIG. 1. For example, two or more pixels in the vertical direction in FIG. One touch sensor TS may be provided for each pixel PIX.
- the pixels PIX arranged in a matrix on the display unit 2 are connected to the gate control line GCL and the signal line SGL. That is, the gate control line GCL is connected to the gate of the select transistor ST of the pixel PIX, wired in the horizontal direction in FIG. 1, and connected to the vertical drive circuit 4 outside the display unit 2.
- the signal line SGL is connected to one of the source and the drain of the select transistor ST of the pixel PIX, wired in the vertical direction in FIG. 1, and connected to the source driver 6 and the sensor readout circuit 3 outside the display unit 2.
- two sensor readout circuits 3 and two source drivers 6 are arranged in consideration of the symmetry of the frame region of the display device 1 and the like.
- the gate control line GCL is shared by the display operation and the touch detection operation
- the signal line SGL is also shared by the display operation and the touch detection operation.
- the display device 1 can perform the touch detection operation by sharing the (video) signal line SGL and the gate control line GCL that are generally used for the display operation.
- the above-described select transistor ST, electrodes (not shown) such as pixel electrodes and storage capacitor electrodes, and wiring lines such as signal lines SGL and gate control lines GCL are regularly formed on the drive substrate.
- the common electrode is formed on a counter substrate in a liquid crystal system such as TN, VA, or ECB, and is formed on a driving substrate in a liquid crystal system in a horizontal electric field mode such as FFS (fringe field switching) or IPS (in-plane switching). .
- FFS far field switching
- IPS in-plane switching
- the source driver 6 is a circuit that supplies a display signal (pixel signal) to the liquid crystal element LC. Specifically, the source driver 6 has a function of generating a pixel signal based on a signal supplied from the IC 5 (described later) via the video signal input line 7 and supplying the pixel signal to the liquid crystal element LC via the signal line SGL. Have.
- the source driver 6 has a function of applying a predetermined voltage (precharge voltage PRE) to the signal line SGL prior to the touch detection operation and the display operation. Specifically, as will be described later, the source driver 6 applies the precharge voltage PRE to the signal line SGL based on the precharge signal Pre supplied from the timing generator 35 of the sensor readout circuit 3.
- the precharge voltage PRE is applied to the signal line SGL in advance, it becomes easier to apply the pixel signal to the signal line SGL, and the display operation is facilitated.
- the source driver 6 and the signal line SGL are connected via a write switch WSW.
- the write switch WSW is ON / OFF controlled by a select signal SEL (not shown).
- the write switch WSW is controlled to be in an on state during a period in which the signal line SGL is used for display operation (video signal application period) and a period in which a precharge operation is performed (precharge period). In a period used for the touch detection operation (touch detection period), control is performed so as to be in an off state.
- many video signal input lines 7 are arranged between the source driver 6 and the IC 5 (described later). If a horizontal drive circuit is formed in the display panel 1P, the number of these signal input lines can be reduced.
- the sensor readout circuit 3 is a circuit that detects a touch based on a touch signal supplied from the touch sensor TS. Specifically, as will be described later, the sensor readout circuit 3 detects a touch signal supplied from the touch sensor TS (one horizontal line) selected by the vertical drive circuit 4 via the signal line SGL, and The touch sensor TS has a function of determining the presence or absence of a touch.
- the sensor readout circuit 3 and the signal line SGL are connected via a readout switch RSW.
- the read switch RSW is controlled so as to be in an ON state in a period (touch detection period) in which the signal line SGL is used for the touch detection operation.
- the sensor readout circuit 3 when it is determined that there is a touch in the touch determination result for one horizontal line, the sensor readout circuit 3 performs parallel-serial conversion on the touch determination result and transfers it to the IC 5 (described later). It is like that. Since the parallel-serial conversion operation and the transfer operation are performed only when the touch determination is made, the power consumption can be reduced. At this time, since the touch determination operation itself is always performed, the response to the touch is not delayed. That is, by using the sensor readout circuit 3, the display device 1 can realize high response performance while suppressing power consumption.
- the introduction of the parallel-serial conversion function is effective in reducing the size of the display panel 1P for the following reasons.
- the signal lines SGL are provided in the display row direction (horizontal direction in FIG. 1) as many as the number of pixels, that is, hundreds to thousands. Therefore, as described above, even when the touch sensor TS is provided in the horizontal direction of FIG. 1 at a ratio of, for example, two pixels PIX, the wiring supplied to the sensor readout circuit 3 among the signal lines SGL. The number of remains high. Since the sensor readout circuit 3 has a parallel-serial conversion function, the number of output lines can be reduced to one (or several), and the number of wires between the display panel 1P and the IC 5 can be greatly increased. Can be reduced. Thereby, the area of the frame of the display panel 1P can be reduced, and an increase in the size of the IC 5 can be suppressed by reducing the number of wirings.
- the vertical drive circuit 4 has a function of selecting a pixel PIX that is a target of the touch detection operation and the display operation. Specifically, the vertical drive circuit 4 applies a write enable pulse ENB to the gate control line GCL, and one row (one horizontal line) of the pixels PIX formed in a matrix on the display unit 2. Is selected as a target for display operation and touch detection operation. In the touch detection period, a touch signal is output from the touch sensor TS of the selected pixel PIX, and is detected by the sensor readout circuit 3, whereby touch detection is performed on the one horizontal line.
- a touch signal is output from the touch sensor TS of the selected pixel PIX, and is detected by the sensor readout circuit 3, whereby touch detection is performed on the one horizontal line.
- a pixel signal is output from the source driver 6 and supplied to the liquid crystal display element LC of the selected pixel PIX, thereby displaying the one horizontal line.
- the vertical drive circuit 4 sequentially scans one horizontal line at a time division, and controls the display device 1 to perform the touch detection operation and the display operation.
- the wiring group from the display panel 1P is connected to the IC 5 of the panel interface unit 1IO through a flexible substrate or the like.
- the IC 5 is a circuit that drives the display panel 1P and performs signal processing. Although not particularly shown, the IC 5 is connected to an input / output pin, and exchanges signals with the outside of the display device 1 via the input / output pin. A signal including the presence / absence of a touch supplied from the sensor readout circuit 3 is transferred to the outside of the display device 1 and used in an electronic device having the display device for an execution trigger signal of a predetermined process, a specific command, or the like. It is done.
- FIG. 2 shows a circuit configuration example of the sensor readout circuit 3.
- the sensor readout circuit 3 includes an operation unit 31 that performs sensor output readout and parallel-serial conversion, and a control IO unit 32 that controls the operation unit 31 and functions as an interface with the outside.
- the operation unit 31 includes a plurality of read transfer units 33 connected in series.
- the read transfer unit 33 includes a read switch RSW, a comparator (cmp) 331, a D-type flip-flop (DFF) 332, and a transistor switch CSW.
- the read switch RSW has one of a source and a drain connected to the signal line SGL and the other connected to a first input terminal (described later) of the comparator 331.
- a read signal Read output from a timing generator 35 (described later) of the control IO unit 32 is supplied to the gate of the read switch RSW. With this configuration, the read switch RSW is turned on when the read signal Read is at “H” level, and the signal of the signal line SGL is supplied to a first input terminal (described later) of the comparator 331. .
- the comparator 331 is a circuit that compares the voltage levels of the signals supplied to the two input terminals.
- the other of the source and drain of the read switch RSW is connected to the first input terminal, and the reference voltage Vref is supplied to the second input terminal.
- the comparator 331 is activated by a precharge signal Pre from a timing generator 35 (described later). That is, the comparator 331 sets the reference voltage Vref supplied from the second input terminal as a threshold when the precharge signal Pre is at “H” level, and when the precharge signal Pre is at “L” level. It is activated to compare the voltage of the first input terminal with this set threshold value.
- the comparator 331 when the comparator 331 is activated, the voltage of the first input terminal (voltage of the signal line SGL) is lower than the voltage of the second input terminal (reference voltage Vref). A logic “H” is output, and a logic “L” is output when the voltage of the first input terminal (voltage of the signal line SGL) is higher than the voltage of the second input terminal (reference voltage Vref). That is, the comparator 331 outputs a logic “H” when there is a touch in the touch sensor TS, and outputs a logic “L” when there is no touch. That is, the output logic of the comparator 331 is high active.
- the D-type flip-flop 332 has a first input terminal in1 and a second input terminal in2, and is a circuit that holds signals supplied to these two terminals and outputs them from the output terminal out.
- the first input terminal in1 is connected to the output terminal of the D-type flip-flop of the preceding stage read transfer unit 33 connected in series, and the second input terminal in2 is connected to the output terminal of the comparator 331.
- FIG. 3 shows a circuit configuration example of the D-type flip-flop 332.
- the D type flip-flop 332 has four inverters INV1 to INV4 and four transfer gate type switches SW1 to SW4.
- the switch SW1 is inserted between the first input terminal in1 and the input terminal of the inverter INV1, and is controlled to be turned on / off by the first transfer clock SCK1 and the first inverted transfer clock SCKb1.
- the inverter INV1 is a circuit that has an input terminal connected to one terminal of the switch SW1 and inverts and outputs an input signal.
- the inverter INV2 is a circuit that has an input terminal connected to the output terminal of the inverter INV1, and inverts and outputs an input signal.
- the switch SW2 is inserted between the output terminal of the inverter INV2 and the input terminal of the inverter INV1, and is on / off controlled by the first inverted transfer clock SCKb1 and the first transfer clock SCK1.
- the switch SW3 is inserted between the output terminal of the inverter INV1 and the input terminal of the inverter INV3, and is controlled to be turned on / off by the first inverted transfer clock SCKb1 and the first transfer clock SCK1.
- the inverter INV3 is a circuit that has an input terminal connected to one terminal of the switch SW3 and the second input terminal in2, inverts an input signal, and outputs the inverted signal as an output signal of the D-type flip-flop 332.
- the inverter INV4 is a circuit that has an input terminal connected to the output terminal of the inverter INV3, and inverts and outputs an input signal.
- the switch SW4 is inserted between the output terminal of the inverter INV4 and the input terminal of the inverter INV3, and is controlled to be turned on / off by the second transfer clock SCK2 and the second inverted transfer clock SCKb2.
- the first inversion transfer clock SCKb1 is generated by being inverted by a first transfer clock inverter (not shown) based on the first transfer clock SCK1.
- the second inverted transfer clock SCKb2 is generated by being inverted by a second transfer clock inverter (not shown) based on the second transfer clock SCK2.
- the switch SW1 and the switch SW2 operate exclusively with each other. That is, the switch SW2 is turned off when the switch SW1 is on, and the switch SW2 is turned on when the switch SW1 is off.
- the switch SW1 and the switch SW3 operate exclusively with each other. That is, the switch SW3 is turned off when the switch SW1 is turned on, and the switch SW3 is turned on when the switch SW1 is turned off.
- the inverters INV1 and INV2 and the switches SW1 and SW2 constitute a master latch ML
- the inverters INV3 and INV4 and the switches SW3 and SW4 constitute a slave latch SL. .
- the read transfer unit 33 is connected in series in the operation unit 31 as described above. That is, as shown in FIG. 2, the output terminal of the D-type flip-flop 332 of a certain read transfer unit 33 is connected to the first input terminal of the D-type flip-flop 332 of the next-stage read transfer unit 33. .
- a plurality of D-type flip-flops 332 connected in series constitute a shift register and perform parallel-serial conversion. Specifically, first, an inactive logic “H” is applied to the input terminal in1 of the first-stage D-type flip-flop 332 from an external controller. Each of the D type flip-flops 332 rewrites the data held in the slave latch SL according to the voltage supplied from the output terminal of the comparator 331 to the second input terminal.
- the output of the comparator 331 corresponding to the touch sensor TS becomes logic “H”, the logic is held in the slave latch SL of the D type flip-flop 332, and the D type flip-flop 332.
- the output of the comparator 331 corresponding to the touch sensor becomes logic “L”, and the logic is held in the slave latch SL of the D type flip-flop 332, and the D type flip-flop 332
- the logic “H” corresponding to the inversion of the output logic of the comparator 331 is output.
- the output logic of the D-type flip-flop 332 is low active.
- the bit string indicating the presence / absence of touch output from the plurality of signal lines SGL is held in the shift register.
- the shift register performs parallel-serial conversion on the bit string in synchronization with the first transfer clock SCK1 and the second transfer clock SCK2, and outputs it from the output terminal out of the D-type flip-flop 332 as the sensor output transfer signal Dout. It is designed to output.
- the transistor switch CSW has a gate connected to the output terminal out of the D-type flip-flop 332, one of the drain and the source is connected to the power supply VDD (corresponding to logic “H”), and the other is the transfer clock of the control IO unit 32.
- the control circuit 37 is connected to the input terminal of the clock control permission signal clk_en.
- the transistor switch CSW since the signal handled by the D-type flip-flop 332 is a low active signal, the transistor switch CSW has a PMOS configuration. That is, by applying the activation logic “L” to the gate of the transistor switch CSW, the transistor switch CSW is turned on, and the activation logic “H” corresponding to the power supply VDD is used as a clock control permission signal clk_en (described later).
- the transfer clock control circuit 37 is supplied.
- One transistor switch CSW is provided in each read transfer unit 33, and all the transistor switches CSW are connected to the input terminal of the clock control permission signal clk_en of the transfer clock control circuit 37.
- the control IO unit 32 includes an interface unit 34, a timing generator 35, an output buffer circuit 36, and a transfer clock control circuit 37.
- the interface unit 34 is an input interface circuit for inputting a signal for controlling the sensor readout circuit 3 supplied from the outside.
- the clock signal CKin is generated based on the clock signal CK for sensor reading supplied from the outside
- the horizontal synchronization signal HDin is generated based on the horizontal synchronization signal HD supplied from the outside.
- a vertical synchronization signal VDin is generated based on the supplied vertical synchronization signal VD, and these signals are supplied to the timing generator 35.
- the timing generator 35 is a circuit that cooperates with a transfer clock control circuit 37 (described later) to generate a signal for controlling a touch signal detection operation and a parallel-serial conversion operation in the operation unit 31. Specifically, the timing generator 35 generates the first transfer clock SCK1, the second transfer clock SCK2, and the read signal Read based on the clock signal CKin, the horizontal synchronization signal HDin, and the vertical synchronization signal VDin supplied from the interface unit 34. And a precharge signal Pre, and supplies them to the read transfer unit 33 of the operation unit 31 and also supplies a read signal Read and a precharge signal Pre to a transfer control circuit 37 (described later). Further, although not shown, the timing generator 35 supplies the precharge signal Pre to the source driver 6 as well.
- the transfer clock control circuit 37 is a circuit that controls the parallel-serial conversion operation in the operation unit 31 based on the clock control permission signal clk_en supplied from the transistor switch CSW of the operation unit 31. Specifically, the transfer clock control circuit 37 detects the touch in the touch detection operation for one horizontal line, and when the activation logic “H” is supplied as the clock control permission signal clk_en from the transistor switch CSW, clk_end is generated and supplied to the timing generator 35. As will be described later, the timing generator 35 controls the first transfer clock SCK1 and the second transfer clock SCK2 based on the clock stop signal clk_end supplied from the transfer clock control circuit 37, and operates the shift register of the operation unit 31. Is to control. The transfer clock control circuit 37 also has a function of setting the clock control permission signal clk_en to the inactive logic “L” and resetting it when the activation logic “H” is input as the precharge signal Pre from the timing generator 35. is doing.
- FIG. 4 shows a circuit configuration example of the transfer clock control circuit 37.
- the transfer clock control circuit 37 includes a transistor Tr1, transfer gate type switches SW5 and SW6, inverters INV5 and INV6, and a NOR circuit NOR1.
- the clock control permission signal clk_en is supplied to one of the drain and the source, the other is grounded, and the precharge signal Pre is supplied to the gate.
- the switch SW5 one terminal is supplied with the clock control permission signal clk_en, the other terminal is connected to the input terminal of the inverter INV5, and is controlled to be turned on / off by the read signal Read and the inverted read signal xRead.
- the inverter INV5 is a circuit that has an input terminal connected to the other terminal of the switch SW5 and inverts and outputs an input signal.
- the first input terminal is connected to the output terminal of the inverter INV5
- the precharge signal Pre is supplied to the second input terminal
- the output terminal is connected to one terminal of the switch SW6, and the first and second An inverted logical sum of the signals supplied to the input terminals is generated and output.
- the switch SW6 is inserted between the output terminal of the NOR circuit NOR1 and the input terminal of the inverter INV5, and is controlled to be turned on / off by the inverted read signal xRead and the read signal Read.
- the inverter INV6 is a circuit whose input terminal is connected to the output terminal of INV5, inverts the input signal, and outputs it as an output signal (clock stop signal clk_end) of the transfer clock control circuit 37.
- the inverted read signal xRead is generated by being inverted by a read signal inverter (not shown) based on the read signal Read.
- the switch SW5 and the switch SW6 operate exclusively with each other. That is, the switch SW6 is turned off when the switch SW5 is turned on, and the switch SW6 is turned on when the switch SW5 is turned off.
- the transfer clock control circuit 37 In the transfer clock control circuit 37, the inverter INV5, the NOR circuit NOR1, and the switches SW5 and SW6 form a latch circuit.
- the transfer clock control circuit 37 functions to permit latch input in synchronization with the precharge signal Pre by supplying the precharge signal Pre to the NOR circuit NOR1.
- the transfer clock control circuit 37 resets the clock control permission signal clk_en to the inactive logic “L” by supplying the activation logic “H” as the precharge signal Pre to the gate of the transistor Tr1.
- the output buffer circuit 36 is a buffer circuit that supplies the sensor output transfer signal Dout output from the shift register of the operation unit 31 to the IC 5 of the panel interface unit 1IO.
- the display panel 1P corresponds to a specific example of “display device” in the present invention.
- the touch sensor TS corresponds to a specific example of “sensor element” in the present invention.
- the liquid crystal element LC corresponds to a specific example of “display element” in the invention.
- the pixel electrode and the common electrode correspond to specific examples of “pixel electrode” and “drive electrode” in the present invention, respectively.
- the signal line SGL corresponds to a specific example of “video signal line” in the present invention, and the pixel signal corresponds to a specific example of “video signal” in the present invention.
- the comparator 331 corresponds to a specific example of “detection unit” in the present invention.
- the D-type flip-flop 332 and the output buffer circuit 36 correspond to a specific example of “transfer output unit” in the present invention.
- the transistor switch CSW, the transfer clock control circuit 37, and the timing generator 35 correspond to a specific example of “a control unit” in the invention.
- the transistor switch CSW corresponds to a specific example of “control signal generation unit” in the present invention
- the timing generator 35 corresponds to a specific example of “operation signal control unit” in the present invention.
- the precharge voltage PRE corresponds to a specific example of the “initialization signal” in the present invention, and the circuit that supplies the precharge voltage PRE to the signal line SGL in the source driver 6 is the “initialization unit” in the present invention. This corresponds to a specific example.
- the source driver 6 generates a pixel signal based on the video signal supplied from the IC 5 and supplies the pixel signal to the display unit 2 via the signal line SGL in the video signal application period.
- the vertical drive circuit 4 drives the gate control line GCL to select the pixels PIX constituting one horizontal line in the display unit 2.
- the display unit 2 performs display on the one horizontal line based on the pixel signal of the signal line SGL and the voltage of the gate control line GCL.
- the display unit 2 performs display over the entire display unit 2 by sequentially scanning one horizontal line at a time division.
- the source driver 6 applies a precharge voltage to the signal line SGL based on the precharge signal Pre supplied from the timing generator 35.
- the touch sensors TS constituting one horizontal line selected by the vertical drive circuit 4 each output a touch signal indicating the presence of an external proximity object to the signal line SGL.
- the operation unit 31 of the sensor readout circuit 3 determines touch based on the voltage change of the voltage Sig of the signal line SGL. When the touch is determined in the touch determination result for the one horizontal line, the operation unit 31 performs parallel-serial conversion on the touch determination result.
- the transfer clock control circuit 37 controls the timing generator 35 so that the operation unit 31 performs parallel-serial conversion when the touch is determined in the touch determination result for one horizontal line, and the touch is not determined.
- the operation unit 31 is controlled not to perform parallel-serial conversion.
- the interface unit 34 inputs a control signal for the sensor readout circuit 3 supplied from the outside.
- the output buffer circuit 36 supplies the sensor output transfer signal Dout signal that is parallel-serial converted and output in the operation unit 31 to the IC 5.
- touch detection is performed over the entire display unit 2 by sequentially scanning one horizontal line at a time division.
- FIG. 5A and 5B show an example of a timing waveform diagram of the display device 1.
- FIG. 5A shows the waveform of the horizontal synchronization signal HD
- FIG. 5B shows the waveform of the write enable pulse ENB
- FIG. The waveform of the signal SEL is shown
- (D) shows the waveform of the voltage Sig of the signal line SGL
- (E) shows the waveform of the precharge signal Pre
- (F) shows the waveform of the read signal Read
- (G) Indicates the waveform of the clock stop signal clk_end
- (H) indicates the waveform of the transfer clock SCK1
- (I) indicates the waveform of the transfer clock SCK2.
- the left half of FIG. 5 represents the operation when there is a touch
- the pixel PIX has the touch sensor TS in the ratio of one for two pixels PIX in the horizontal direction of FIG. 1 and the touch sensor TS in the ratio of one for two pixels PIX in the vertical direction of FIG.
- the horizontal synchronization signal HD defines one horizontal line period (1H).
- the display device 1 first performs a precharge operation at timings T0 to T1. Next, the display device 1 performs a touch detection operation for one horizontal line at timings T2 to T3, and thereafter performs parallel-serial conversion on the detection result based on the transfer clock SCK and outputs the result. Then, the display device 1 performs a display operation after the timing T3.
- the period from timing T0 to T1 corresponds to a specific example of “initialization period” in the present invention
- the period after timing T3 corresponds to a specific example of “video signal application period” in the present invention.
- the timing generator 35 In synchronization with the timing T0, the timing generator 35 generates the precharge signal Pre as a positive pulse having a predetermined duration (FIG. 5E).
- the precharge signal Pre is supplied to the comparator 331 and the transfer clock control circuit 37.
- the comparator 331 sets the reference voltage Vref applied to the second input terminal as a threshold value for the comparison operation.
- the transfer clock control circuit 37 as shown in FIG.
- the precharge signal Pre is also supplied to the source driver 6.
- the select signal SEL becomes the “H” level for a short predetermined time from the timing T0 to the timing T1 (FIG. 5C).
- the write switch WSW is turned on, and the voltage Sig of the signal line SGL is set to the precharge voltage PRE (“H” level DC voltage) (FIG. 5D).
- the precharge signal Pre falls (FIG. 5E), and when the application of the precharge voltage PRE to the signal line SGL is completed, the precharge voltage PRE decreases.
- Start (FIG. 5D). This is because the electric charge charged between the pixel electrode (switch electrode) and the common electrode by the precharge operation is discharged through the touch sensor TS that is turned on by pressing by an external proximity object. . That is, the touch sensor TS is a charge discharge path.
- no decrease in the precharge voltage PRE is observed in the right half of FIG. This is because there is no touch, the touch sensor TS is not turned on, and a charge discharge path is not generated.
- the comparator 331 starts a comparison operation between the voltage of the first input terminal and the threshold value (reference voltage Vref).
- the read signal Read rises at timing T2 (FIG. 5 (F)).
- the read switch RSW is turned on, and the read transfer unit 33 is ready to detect a touch signal. That is, detection of the voltage Sig appearing on the signal line SGL thereafter is executed.
- the read signal Read is also supplied to the transfer clock control circuit 37.
- the transfer clock control circuit 37 as shown in FIG. 4, when the read signal Read becomes “H” level, the switch SW5 is turned on and the switch SW6 is turned off. As a result, a change (change from logic “L” to logic “H”) of the clock control permission signal clk_en that is an input signal of the transfer clock control circuit 37 can be captured.
- the output of the comparator 331 changes from the “L” level to the “H” level in response to the change in the voltage Sig of the signal line SGL (from the “H” level to the “L” level).
- the output of the type flip-flop 332 changes from “H” level to “L” level.
- the transistor switch CSW changes from the off state to the on state
- the clock control permission signal clk_en changes from the L ”level to the“ H ”level.
- the transfer clock control circuit 37 takes in the clock control permission signal clk_en.
- the clock stop signal clk_end which is the output signal of the transfer clock control circuit 37, changes from the “L” level to the “H” level (FIG. 5G).
- the clock control permission signal clk_en is at the “L” level. Accordingly, the clock stop signal clk_end also changes from the “L” level to the “H” level.
- the transfer clock control circuit 37 stops taking in the clock control permission signal clk_en and holds the clock stop signal clk_end, which is an output signal, at the “H” level.
- the holding state of the clock stop signal clk_end is maintained until the “H” level is next supplied as the precharge signal Pre and reset by the NOR circuit NOR1 (FIG. 5G).
- the timing generator 35 generates the transfer clock SCK only when the clock stop signal clk_end is at the “H” level (FIG. 5H), and supplies it to the shift register of the operation unit 31. That is, the timing generator 35 supplies the transfer clock SCK to the shift register only when a touch is detected in one horizontal line performing the touch detection operation.
- the voltage Sig of the signal line SGL remains the precharge voltage PRE even after the precharge operation (FIG. 5D). Therefore, the output of the D-type flip-flop 332 does not change at the “H” level. Therefore, the transistor switch CSW remains off, and the clock control permission signal clk_en remains at the “L” level. As a result, the clock stop signal clk_end also remains at “L” level (FIG. 5G), and the transfer clock SCK is not generated (FIG. 5H).
- the shift register constituted by a plurality of D-type flip-flops 332 of the operation unit 31 performs parallel-serial conversion when the transfer clock SCK is supplied. That is, the shift register performs parallel-serial conversion on the touch detection result information for one horizontal line only when there is a touch, and outputs the result as a sensor output transfer signal Dout.
- the sensor output transfer signal Dout is transferred to the outside through the output buffer circuit 36.
- the pixel PIX has the touch sensor TS in the ratio of one to two pixels PIX in the vertical direction of FIG. For this reason, the time when the sensor output transfer signal Dout is output (corresponding to the time when the transfer clock SCK exists in FIG. 5H) is 2H. That is, in this example, the transfer operation of the touch detection result to the outside is performed in about 1 to 2H period (1-2 horizontal line period) after the touch operation.
- a touch on one horizontal line is detected from timing T1 to timing T3, and then the detection result is transferred to the outside as serial data.
- the display operation is performed after timing T3.
- the select signal SEL sequentially becomes the activation level (“H”) for each of the RGB colors (FIG. 5C). Accordingly, the write switch WSW is sequentially turned on, and the source driver 6 applies the pixel signal to the signal line SGL (FIG. 5D), and the pixel PIX performs display based on the pixel signal.
- the sensor reading circuit 3 performs parallel-serial conversion on the touch detection result for one horizontal line and supplies the result to the IC 5 as serial data.
- the number of wirings between the sensor readout circuit and the IC 5 can be reduced.
- the wiring area can be narrowed, so that the frame area of the display device 1 can be narrowed. it can. In other words, the display device 1 can be reduced in size.
- the display device 1 always performs a touch detection operation for each horizontal line by sequential scanning, and performs a parallel-serial conversion operation only when it is determined that there is a touch in the touch detection result for each horizontal line.
- the display apparatus 1 can implement
- the display device 1x is configured using a sensor readout circuit in which the transistor switch CSW is omitted.
- FIG. 6 shows a circuit configuration example of the sensor readout circuit 3x according to this comparative example.
- the sensor readout circuit 3x includes an operation unit 31x and a control IO unit 32x.
- the operation unit 31x includes a plurality of read transfer units 33x connected in series.
- the transistor switch CSW is omitted as compared with the read transfer unit 33 (FIG. 2) according to the present embodiment.
- the control IO unit 32x includes a timing generator 35x.
- the transfer clock control circuit 37 connected to the transistor switch CSW in the sensor readout circuit 3 (FIG. 2) according to the present embodiment is omitted. Accordingly, the timing generator 35x does not have a function to stop supplying the transfer clock SCK by external control, as will be described later.
- FIG. 7 shows an example of a timing waveform diagram of the display device 1x.
- A shows the waveform of the horizontal synchronization signal HD
- B shows the waveform of the write enable pulse ENB
- C shows the select signal.
- the waveform of the signal SEL is shown
- D shows the waveform of the voltage Sig of the signal line SGL
- E shows the waveform of the precharge signal Pre
- F shows the waveform of the read signal Read
- (G) Indicates the waveform of the transfer clock SCK1
- (H) indicates the waveform of the transfer clock SCK2.
- the left half of FIG. 7 represents the operation when there is a touch
- the right half of FIG. 7 represents the operation when there is no touch.
- the transfer clock SCK is generated by the timing generator 35x and supplied to the shift register regardless of the presence or absence of touch. Therefore, in the display device 1x, power consumption increases.
- the display operation is generally performed constantly, whereas the touch detection operation is not always performed. That is, it is considered that the frequency with which a user inputs information using a touch panel is usually quite low. Therefore, as in this comparative example, it is disadvantageous to supply the transfer clock SCK to the shift register regardless of whether or not it is touched, particularly from the viewpoint of power consumption, particularly for a display device of a mobile device. large.
- the transfer clock SCK is supplied to the shift register only when it is determined that there is a touch in the touch detection result of one horizontal line. That is, in the sensor readout circuit 3 of the present embodiment, the shift register operates only when necessary, and transfers the touch detection result to the outside. Therefore, the display device 1 can reduce power consumption. Further, since the transfer operation is performed in about 1 to 2H period after the touch operation, the responsiveness is good.
- the touch detection operation for each horizontal line is always performed by sequential scanning, and the parallel-serial conversion operation is performed only when it is determined that there is a touch in the touch detection result for each horizontal line. Since serial data is transferred to the outside, high response performance can be realized while suppressing power consumption.
- the frame area of the display device can be narrowed, and the display device can be downsized.
- the wiring in the display unit 2 can be reduced.
- the display 1S is configured using a display unit that does not share wiring in the display operation and the touch detection operation.
- the substantially same part as the display apparatus 1 which concerns on this Embodiment attaches
- FIG. 8 shows a configuration example of the display device 1S according to this comparative example.
- the display device 1S includes a display unit 2S and a sensor vertical drive circuit 4S.
- the display unit 2S includes a sensor line TSL, a sensor gate control line GCL2, and a sensor select transistor ST2.
- the touch sensor TS is configured separately from the liquid crystal element LC.
- One of the source and drain of the sensor select transistor ST2 is connected to the sensor line TSL, and the other is connected to the touch sensor TS.
- the gate of the sensor select transistor ST2 is connected to the sensor gate control line GCL2.
- the sensor gate control line GCL2 is connected to the sensor vertical drive circuit 4S, and the sensor line TSL is connected to the sensor readout circuit 3.
- the sensor vertical drive circuit 4S has a function of selecting a pixel PIX that is a target of the touch detection operation. Specifically, the sensor vertical drive circuit 4S applies a signal for selecting the touch sensor TS to the sensor gate control line GCL2.
- the signal line SGL and the gate control line GCL are used in the display operation, while the sensor line TSL and the sensor gate control line GCL2 are used in the touch detection operation.
- the display device 1S performs the parallel-serial conversion operation only when it is determined that there is a touch in the touch detection result in each horizontal line, similarly to the display device 1 according to the above embodiment. Thereby, the display device 1S can realize high response performance while suppressing power consumption.
- the display device 1S is configured by separating the touch sensor TS and the liquid crystal element LC, the display operation and the touch detection operation can be performed independently, and a touch detection operation with a high degree of freedom can be realized.
- the display device 1A according to the present embodiment is applied to a display device that performs line inversion driving, and can perform a touch detection operation even when performing a precharge operation in an AC manner based on a common drive signal COM. Is.
- symbol is attached
- FIG. 9 illustrates a circuit configuration example of the sensor readout circuit 40 in the display device of the present embodiment.
- the sensor readout circuit 40 includes an operation unit 41.
- the operation unit 41 includes a plurality of read transfer units 43 connected in series.
- the read transfer unit 43 has an exclusive OR circuit (eor) XOR.
- the exclusive OR circuit XOR the first input terminal is connected to the output terminal of the D-type flip-flop 332, the common input signal COM is supplied to the second input terminal, and the output terminal is connected to the gate terminal of the transistor switch CSW.
- the exclusive OR of the signals respectively supplied to the first input terminal and the second input terminal is generated and output.
- the display device 1A can detect touch even when performing a precharge operation in an AC manner in line inversion driving in which the pixel signal and the common driving signal COM are inverted for each horizontal line (1H). The operation can be performed.
- Other configurations are the same as those in FIG.
- the exclusive OR circuit corresponds to a specific example of “logic gate circuit” in the present invention.
- FIG. 10 shows an example of a timing waveform diagram of the display device 1A.
- A shows the waveform of the horizontal synchronization signal HD
- B shows the waveform of the write enable pulse ENB
- C shows the select signal.
- the waveform of the signal SEL is shown
- D shows the waveform of the voltage Sig of the signal line SGL
- E shows the waveform of the precharge signal Pre
- F shows the waveform of the read signal Read
- G Indicates the waveform of the clock stop signal clk_end
- (H) indicates the waveform of the transfer clock SCK1
- I indicates the waveform of the transfer clock SCK2.
- the left half of FIG. 10 represents the operation when there is a touch
- the right half of FIG. 10 represents the operation when there is no touch.
- the timing generator 35 generates the precharge signal Pre as a positive pulse having a predetermined duration in synchronization with the horizontal synchronization signal HD (FIG. 10 (E)). Based on the precharge signal Pre, the source driver 6 performs a precharge operation on the signal line SGL, and the comparator 331 can perform a touch signal detection operation.
- the source driver 6 sets the voltage Sig of the signal line SGL so as to invert the polarity for each horizontal line in the precharge operation (FIG. 10D).
- the reason is as follows. That is, in the line inversion drive, the common drive signal COM that reverses the polarity for each horizontal line is supplied to the common electrode of the pixel PIX. A pixel signal whose polarity is inverted every horizontal line is supplied from the source driver 6 to the pixel electrode of the pixel PIX. Thereby, the liquid crystal element LC performs display based on the potential difference between the voltage of the pixel electrode and the voltage of the common electrode. At this time, the precharge voltage PRE needs to be set to be synchronized with the common drive signal COM.
- the source driver 6 operates to set the voltage Sig of the signal line SGL to a voltage level of “xCOM” obtained by inverting the voltage level of the common drive signal COM in the precharge operation. That is, when the common drive signal COM is “H” level, the precharge voltage PRE is “L” level, and when the common drive signal COM is “L” level, the precharge voltage PRE is “H” level. .
- the precharge voltage PRE is inverted for each horizontal line, like the common drive signal COM. With this AC precharge operation, the display device 1 can perform a desired display operation.
- the timing generator 35 After the precharge operation is completed at timing T1, the timing generator 35 generates a pulse of the read signal Read at timing T2 (FIG. 10F). Accordingly, the comparator 331 reads the voltage Sig of the signal line SGL and determines whether or not there is a touch, as in the first embodiment.
- the voltage Sig of the signal line SGL changes so as to reverse from the “xCOM” level set by the precharge operation to the “COM” level (FIG. 10D). This is because the pixel electrode set to the “xCOM” level by the precharge operation comes into contact with the common electrode when the touch sensor TS is turned on, and the “COM” level applied to the common electrode is supplied to the pixel electrode. It is because it comes to be done.
- the comparator 31 detects the change in the voltage Sig of the signal line SGL and changes the output voltage from the “COM” level to the “xCOM” level.
- the D-type flip-flop 332 changes the output voltage from the “xCOM” level to the “COM” level based on the change in the output voltage of the comparator 31. That is, when a touch is detected and the common drive signal COM is at “H” level, the output voltage of the D-type flip-flop 332 changes from “L” level to “H” level, and the common drive signal COM is changed to “H” level. In the case of the L level, the output voltage of the comparator 31 changes from the “H” level to the “L” level. As described above, when line inversion driving is performed, the behavior of the output signal of the D-type flip-flop 332 differs depending on whether the common driving signal COM is at “H” level or “L” level.
- the exclusive OR circuit XOR is used for converting logic so as not to depend on the common drive signal COM when the transistor switch CSW is controlled based on the output signal of the D-type flip-flop 332. Specifically, the exclusive OR circuit XOR calculates the exclusive OR of the output of the D type flip-flop 332 and the common drive signal COM, and supplies the result to the gate of the transistor switch CSW. That is, the output of the exclusive OR circuit XOR is output from the “H” level to the “L” level when a touch is detected regardless of whether the common drive signal COM is at the “H” level or the “L” level. To change.
- the transfer clock control circuit 37 changes the clock stop signal clk_end, which is an output signal, from the “L” level to the “H” level based on the clock control permission signal clk_en (FIG. 10G).
- the timing generator 35 supplies the transfer clock SCK to the operating unit 41 while the clock stop signal clk_end is at the “H” level (FIG. 10H).
- the shift register performs a parallel-serial conversion operation based on the transfer clock SCK, and outputs touch detection information regarding one horizontal line as a sensor output transfer signal Dout.
- the serial data is transferred to the outside via the output buffer circuit 36.
- the display device 1B according to the present embodiment is applied to a display device that performs line inversion driving, and further can dynamically change the frequency of detection operation by the sensor readout circuit depending on the presence or absence of touch.
- symbol is attached
- FIG. 11 illustrates a circuit configuration example of the sensor readout circuit 50 in the display device of the present embodiment.
- the sensor readout circuit 50 includes an operation unit 51 and a control IO unit 52.
- the connection of the gate terminals of some readout switches RSW is changed as compared with the operation unit 41 (FIG. 9) according to the second embodiment. That is, in this example, the second read signal Read2 is supplied to the gate of the four read switches RSW instead of the read signal Read.
- the second read signal Read2 is generated by a timing generator 35A (described later).
- the control IO unit 52 includes a control circuit block 38 and a timing generator 35A.
- the control circuit block 38 is a circuit that sets an operation mode for limiting the operation of the touch panel so as to reduce power consumption when no touch is detected in a predetermined number of frames. Specifically, the control circuit block 38 generates the operation mode signal TG_en [1: 0] based on the serial data supplied from the shift register of the operation unit 51 and the signal Vdst output from the timing generator 35A. The timing generator 35A is supplied. The signal Vdst is a signal generated from the vertical synchronization signal VD, and is generated in synchronization with the vertical synchronization signal VD. That is, the control circuit block 38 obtains the time when there is no touch in units of frames by counting the signal Vdst over the time when data is not transferred from the shift register of the operation unit 51. Then, the control circuit block 38 recognizes that the frequency of use as a touch panel has dropped when there is no touch in a certain period (for example, several frame periods), and sets the operation mode so as to reduce power consumption. It has a function.
- the display device 1B has three modes (normal mode, non-contact mode A, and non-contact mode B) as operation modes of the touch panel.
- the normal mode is an operation mode when a touch is detected on the touch panel. For example, as described in the first embodiment, touch detection is performed every 2H periods (two horizontal line periods). is there.
- the non-contact mode A is an example of a mode for reducing power consumption, operates only the read transfer unit 43 controlled by the second read signal Read2, and performs touch detection every 8H period (8 horizontal line periods). Is to do. That is, in the non-contact mode A, the position accuracy and the operation frequency of touch detection are each set to 1/4 as compared with the normal mode.
- the non-contact mode B is an example of a mode for further reducing power consumption.
- the non-contact mode B operates only the read transfer unit 43 controlled by the second read signal Read2, and further performs touch detection every 8H period for the 3F period ( This is performed every 3 frame periods). That is, in the non-contact mode B, compared with the non-contact mode A, the operation frequency of touch detection is 1/3.
- the control circuit block 38 generates an operation mode signal TG_en [1: 0] corresponding to these operation modes according to the touch state on the touch panel, and instructs the timing generator 35A of the operation mode. Specifically, when setting the operation mode of the touch panel to the normal mode, the control circuit block 38 outputs “00b” as the operation mode signal TG_en [1: 0] and sets the non-contact mode A. When “01b” is output and the non-contact mode A is set, “11b” is output.
- the timing generator 35A controls the operation unit 51 based on the operation mode signal TG_en [1: 0] supplied from the control circuit block 38. Other functions are the same as those of the timing generator 35 of the first and second embodiments.
- the read signal is supplied to the transfer clock control circuit 37 as shown in FIGS. 2 and 9, but in this embodiment, instead of this, The second read signal Read2 is supplied to the transfer clock control circuit 37.
- the timing generator 35A controls the transfer clock in the same manner as in the first and second embodiments even in the non-contact modes A and B in which the read transfer unit 43 of the operation unit 51 is not operated as will be described later.
- the circuit 37 can be controlled.
- the transistor switch CSW, the transfer clock control circuit 37, the timing generator 35A, and the control circuit block 38 correspond to a specific example of “a control unit” in the present invention.
- FIG. 12 shows an example of a timing waveform diagram of the display device 1B.
- FIG. 12A to 12E are timing waveform diagrams when there is a touch in the normal mode
- FIG. 12A shows the waveform of the horizontal synchronization signal HD
- FIG. 12B shows the read signal.
- the waveform of Read is shown
- C shows the waveform of the second read signal Read2
- D shows the waveform of the transfer clock SCK
- E shows the waveform of the sensor output transfer signal Dout.
- (F) to (J) show timing waveform diagrams when there is a touch in the non-contact mode A, (F) shows the waveform of the horizontal synchronizing signal HD, and (G) shows The waveform of the read signal Read is shown, (H) shows the waveform of the second read signal Read2, (I) shows the waveform of the transfer clock SCK, and (J) shows the waveform of the sensor output transfer signal Dout.
- (K) to (P) represent timing waveform diagrams in the non-contact mode B
- (K) represents the waveform of the vertical synchronization signal VD
- (L) represents the waveform of the horizontal synchronization signal HD.
- (M) shows the waveform of the read signal Read
- (N) shows the waveform of the second read signal Read2
- (O) shows the waveform of the transfer clock SCK
- (P) shows the sensor output transfer signal Dout. The waveform is shown.
- FIG. 13 is a conceptual diagram of each operation mode of the touch panel in the display device 1B.
- (A) shows the operation in the normal mode
- (B) shows the operation in the non-contact mode A
- (C) shows The operation in the non-contact mode B is shown.
- FIG. 13 schematically shows an operation state of the sensor readout circuit 50 and the matrix arrangement of the pixels PIX of the display unit 2.
- a transistor switch CSW is obtained by blocking the plurality of transistor switches CSW shown in FIG.
- the D-type flip-flop / shift register (DFF / SR) 332 is obtained by blocking the plurality of D-type flip-flops 332 shown in FIG.
- a portion surrounded by a thick line represents a block that operates (or can operate) in response to a clock supply or operation enable signal, and a portion not surrounded by a thick line stops the clock supply or operates. Since there is no enable signal input, the block is stopped.
- black circles represent pixels PIX that are targets of the touch detection operation
- white circles represent pixels PIX that are not targets of the touch detection operation because the touch detection circuit is not activated.
- the black circle is represented as “operation” and the white circle is represented as “stop”.
- the triangle mark represents the pixel PIX in which the touch detection operation is performed every 3F period (3 frame periods). Note that a portion where none of the black circles, white circles, and triangles are shown at the intersections of the grids represents display-only pixels PIX in which the touch sensor TS itself is not provided.
- the timing generator 35A In the normal mode, as shown in FIGS. 12A to 12E, the timing generator 35A generates pulses as the read signal Read and the second read signal Read2 (FIGS. 12B and 12C), This is supplied to the operation unit 51. As a result, the touch detection operation is performed in all of the plurality of read transfer units 43 of the operation unit 51. As a result, the operation unit 51 performs the touch detection operation every 2H period (two horizontal line periods) as in the second embodiment, and the detection result is parallel when it is determined that there is a touch. Serial conversion is performed, and the sensor output transfer signal Dout is transferred to the output buffer circuit 36 (FIG. 12E).
- the control circuit block 38 recognizes that the frequency of use as the touch panel has dropped when there is no sensor output transfer signal Dout over a certain period (for example, one frame period), and as the operation mode signal TG_en [1: 0]. “01b” is output. Thereby, the timing generator 35A controls the operation unit 51 so that the touch panel of the display device 1B operates in the non-contact mode A.
- the timing generator 35A fixes the read signal Read to the “L” level (FIG. 12G). Then, the timing generator 35A generates a pulse every 8H period (8 horizontal line periods) as the second read signal Read2 (FIG. 12 (H)) and supplies the pulse to the operation unit 51.
- the touch detection operation is performed only in the read transfer unit 43 to which the second read signal Read2 is connected among the plurality of read transfer units 43 of the operation unit 51.
- the operation unit 51 performs a touch detection operation on one of the four touch sensors TS arranged in the horizontal direction of the display unit 2, and when it is determined that there is a touch, the detection result is a parameter.
- the data is subjected to serial conversion and output as a sensor output transfer signal Dout (FIG. 12 (J)) and transferred to the outside via the output buffer circuit 36. This operation is performed every 8H period (8 horizontal line periods).
- the control circuit block 38 recognizes that the touch panel is not used when there is no sensor output transfer signal Dout for a certain period (for example, 3 frame periods), and sets the operation mode signal TG_en [1: 0] as “ 11b ′′ is output. Thereby, the timing generator 35A controls the operation unit 51 so that the touch panel of the display device 1B operates in the non-contact mode B.
- the “certain period” serving as a criterion for determining the transition to the non-contact mode B is set to be longer than the “certain period” serving as a criterion for determining the transition from the normal mode to the non-contact mode A.
- the display device 1B operates in the same manner as the non-contact mode A every 3F period (3 frame periods). I do.
- the touch panel is set so as to have a pseudo optimum touch sensor density according to the operation state of the touch panel by the user, and the operation frequency of the comparator 331 and the operation of transferring the touch detection result to the outside Can reduce the frequency. As a result, current consumption can be reduced. In addition, since the operating frequency of the shift register including the D-type flip-flop 332 is reduced, power consumption can be reduced. Similarly, the timing generator 35A, the transfer clock control circuit 37, the control circuit block 38, and the like shown in FIG. 11 can also reduce power consumption.
- the control circuit block 38 recognizes that there is a touch operation on the touch panel, and resets the counter based on the signal Vdst. Then, “00b” is output as the operation mode signal TG_en [1: 0]. Thereby, the timing generator 35A controls the operation unit 51 so that the touch panel of the display device 1B operates in the normal mode.
- both the non-contact mode A and the non-contact mode B do not necessarily have to be provided as operation modes for realizing low power consumption.
- only two operation modes of the normal mode and the non-contact mode B may be provided.
- the operation of the touch panel may directly shift from the normal mode to the non-contact mode B.
- Display device 1C according to the present embodiment is configured by using a sensor readout circuit in which the sensor readout circuit does not have a parallel-serial conversion function.
- symbol is attached
- FIG. 14 shows a configuration example of the display device 1C
- FIG. 15 shows a circuit configuration example of the sensor readout circuit 60 according to the display device 1C
- the display device 1C includes sensor readout circuits 60A and 60B and an IC 5C.
- the sensor readout circuits 60A and 60B supply the touch detection result to the IC 5C via the touch signal output line 8 without performing parallel-serial conversion on the touch detection result as will be described later.
- the sensor readout circuit 60 is appropriately used as a general term for the sensor readout circuits 60A and 60B.
- the sensor readout circuit 60 includes an operation unit 61 and a control IO unit 62.
- the operation unit 61 includes a plurality of reading units 63.
- Read unit 63 includes an inverter 632 and an output buffer 633.
- the inverter 632 is a circuit that inverts the output signal of the comparator 331.
- the output buffer 633 is activated by an output control signal Octl supplied from a timing generator 64 (described later) of the control IO unit 62 and, when activated, a touch signal based on the output signal of the inverter 632. This is a circuit for driving the output line 8.
- the output buffer 633 is activated, for example, when the output control signal Octl is at “H” level, latches the output signal of the inverter 632 and drives the touch signal output line 8 based on the signal.
- the output control signal Octl is at “L” level
- the control IO unit 62 includes a timing generator 64.
- the timing generator 64 generates an output control signal Octl based on the clock stop signal clk_end supplied from the transfer clock control circuit 37 and supplies it to the output buffer 633 of the operation unit 61.
- the output buffer 633 corresponds to a specific example of a “transfer output unit” in the present invention.
- the transistor switch CSW, the transfer clock control circuit 37, and the timing generator 64 correspond to a specific example of “a control unit” in the invention.
- the sensor readout circuit 60 operates as follows. That is, the transfer clock control circuit 37 generates the clock stop signal clk_end and supplies it to the timing generator 35 when a touch is detected in the touch detection operation for one horizontal line.
- the timing generator 64 controls the output control signal Octl based on the clock stop signal clk_end supplied from the transfer clock control circuit 37, and controls the operation of the output buffer 633 of the operation unit 31. That is, the output buffer 633 drives the touch signal output line 8 only when a touch is detected at one place in the touch detection operation for one horizontal line, and enters the power-down state when no touch is detected.
- the touch detection operation for each horizontal line is always performed by sequential scanning, and the detection result is output only when it is determined that there is a touch in the touch detection result for each horizontal line. Since the output buffer is powered down when there is no touch, high response performance can be realized while suppressing power consumption.
- the wiring in the display unit 2 can be reduced.
- the display device in the above embodiment can be applied to electronic devices in various fields such as a television device, a digital camera, a notebook personal computer, a mobile terminal device such as a mobile phone, or a video camera.
- the display device of the above embodiment can be applied to electronic devices in all fields that display an externally input video signal or an internally generated video signal as an image or video.
- FIG. 16 illustrates an appearance of a television device to which the display device of the above embodiment is applied.
- This television apparatus has, for example, a video display screen unit 510 including a front panel 511 and a filter glass 512, and the video display screen unit 510 is configured by the display device according to the above embodiment.
- FIG. 17 shows the appearance of a digital camera to which the display device of the above embodiment is applied.
- the digital camera includes, for example, a flash light emitting unit 521, a display unit 522, a menu switch 523, and a shutter button 524, and the display unit 522 is configured by the display device according to the above embodiment. .
- FIG. 18 shows the appearance of a notebook personal computer to which the display device of the above embodiment is applied.
- This notebook personal computer has, for example, a main body 531, a keyboard 532 for inputting characters and the like, and a display unit 533 for displaying an image.
- the display unit 533 is a display device according to the above embodiment. It is comprised by.
- FIG. 19 shows the appearance of a video camera to which the display device of the above embodiment is applied.
- This video camera has, for example, a main body 541, a subject shooting lens 542 provided on the front side surface of the main body 541, a start / stop switch 543 at the time of shooting, and a display 544.
- the display part 544 is comprised by the display apparatus which concerns on the said embodiment.
- FIG. 20 shows an appearance of a mobile phone to which the display device of the above embodiment is applied.
- this mobile phone is obtained by connecting an upper housing 710 and a lower housing 720 with a connecting portion (hinge portion) 730, and includes a display 740, a sub-display 750, a picture light 760, and a camera 770.
- the display 740 or the sub-display 750 is configured by the display device according to the above embodiment.
- a contact-type touch sensor is used as a touch sensor, but the present invention is not limited to this.
- a capacitive touch sensor may be used instead of the contact touch sensor.
- FIG. 21 shows a configuration example of a display device incorporating a capacitive touch sensor.
- the display device 1D includes a display pixel 10 and a capacitive touch sensor TSD in a pixel PIX.
- the touch sensor TSD has a capacitance Ck.
- the electrostatic capacitance Ck is formed between the drive electrode 100 and the touch detection electrode 110.
- the drive electrode 100 is connected to the drive electrode drive circuit 8, and the touch detection electrode 110 is connected to the sensor readout circuit 9.
- the touch sensor TSD transmits the amount of the drive signal according to the contact of an external object.
- the touch detection operation is performed by utilizing the change of.
- the display unit 2 includes dedicated signal wirings for the display operation and the touch detection operation. That is, the display cell 10 that performs the display operation is connected to the signal line SGL and the gate control line GCL, and the touch sensor TSD that performs the touch detection operation is connected to the touch detection electrode 110 and the drive electrode 100. .
- the touch sensor TSD corresponds to a specific example of “capacitance type sensor element” in the present invention.
- the same one as used in the first to third embodiments can be used. That is, for example, in the sensor readout circuit 3 (FIG. 2) according to the first embodiment, the connection destination of the readout switch RSW is changed from the signal line SGL to the touch detection electrode 110, and the comparator 331 is related to this modification.
- the comparator 331 is related to this modification.
- the display device 1D is not limited to the method of the display cell 10, and may be any type.
- the display cell 10 may be, for example, a liquid crystal element or an EL element such as an organic EL element.
- FIG. 22 shows a configuration example of the display cell 10, where (A) shows a case where a liquid crystal element LC is used, and (B) shows a case where an organic EL element is used.
- the liquid crystal element LC When the liquid crystal element LC is used as the display cell 10, the liquid crystal element LC includes the pixel signal supplied to the pixel electrode via the signal line SGL and the select transistor ST, and the drive supplied to the common electrode (drive electrode 100). A display operation can be performed based on the signal VCOM.
- a pixel signal is supplied to one end of the capacitor Cs via the signal line SGL and the select transistor ST.
- the power supply voltage is supplied to the power supply line PSL after the select transistor ST is turned off, the bias of the transistor PT is set by the bootstrap operation, and the transistor PT passes a current corresponding to the pixel signal. Functions as a current source.
- the organic EL element EL emits light, and a display operation can be performed.
- FIG. 23 shows a configuration example of a display device incorporating an optical touch sensor.
- the display device 1E includes an optical touch sensor TSE.
- the touch sensor TSE includes a photodiode 121, a capacitor element 122, and transistors 123 to 125.
- the photodiode 121 has a cathode connected to the power supply VDD and an anode connected to one end of the capacitor 122.
- the capacitive element 122 is disposed between the anode of the photodiode 121 and the ground (GND).
- the transistors 123 to 125 are constituted by TFTs, for example.
- the transistor 123 has a drain connected to the anode of the photodiode 121, a gate connected to the reset line RSTL, and a source connected to the ground (GND).
- the transistor 124 has a source connected to the power supply VDD, a gate connected to the anode of the photodiode 121, and a drain connected to the source of the transistor 125.
- the transistor 125 has a source connected to the drain of the transistor 124, a gate connected to the lead line RDL, and a drain connected to the sensor line TSL.
- the sensor line TSL is connected to the sensor readout circuits 12A and 12B.
- the reset line RSTL and the lead line RDL are connected to the sensor drive circuit 11.
- the transistor 123 is turned on by the signal of the reset line RSTL, and the capacitor 122 is discharged and reset.
- the photodiode 121 receives a light amount corresponding to the presence of an external proximity object, generates a current from the cathode to the anode in accordance with the light amount, and charges the capacitive element 122 by this current for an arbitrary period.
- the transistor 125 is turned on by a signal on the lead wire RDL, a voltage corresponding to the voltage across the charged capacitive element 122 is output to the sensor line TSL. Touch detection is possible by detecting the voltage output to the sensor line TSL by the sensor readout circuits 12A and 12B.
- the touch sensor TSE corresponds to a specific example of “optical sensor element” in the present invention.
- the display device 1E is not limited to the type of the display cell 10, and may be any type, for example, a liquid crystal element (FIG. 22A) or an EL element such as an organic EL element. An element using an element (FIG. 22B) may be used.
- the output signal of the touch sensor was taken out from the display part using the signal wire
- a dedicated line (sensor line) for sensor reading may be provided so that the output signal of the touch sensor is taken out from the display unit.
- the frequency of the clock signal is lowered (shift from the normal mode to the non-contact mode A), and further, the supply of the clock signal is stopped (from the non-contact mode A to the non-contact mode B).
- the operation frequency is reduced by the transition) and the power consumption is reduced, it is not limited to this.
- FIGS. 11 to 13 when the touch detection operation is performed on one of four touch sensors TS arranged in the horizontal direction of the display unit 2 in the non-contact mode A.
- a method of providing four shift registers is conceivable. That is, for example, the connection is made so that the output from every fourth touch sensor TS is supplied to the shift register of the same system.
- unit may be sufficient.
Abstract
Description
1.第1の実施の形態
2.第2の実施の形態
3.第3の実施の形態
4.第4の実施の形態
5.適用例
6.変形例
[構成例]
(全体構成例)
図1は、本発明の第1の実施の形態に係る表示装置の一構成例を表すものである。ディスプレイ装置1は、表示パネルとタッチパネルが一体化した、いわゆるインセル型のディスプレイ装置であり、表示素子として液晶素子を用い、タッチセンサ素子として接触式タッチセンサを用いて構成されたものである。
次に、センサ読出回路3について詳細に説明する。
続いて、本実施の形態のディスプレイ装置1の動作および作用について説明する。
表示動作については、まず、ソースドライバ6が、IC5から供給される映像信号に基づいて画素信号を生成し、映像信号印加期間において信号線SGLを介して表示部2に供給する。垂直駆動回路4は、ゲート制御線GCLを駆動することにより、表示部2おいて、1水平ラインを構成する画素PIXを選択する。表示部2は、信号線SGLの画素信号およびゲート制御線GCLの電圧に基づいて、この1水平ラインに対する表示を行う。表示部2では、時分割的に1水平ラインずつ順次走査されることにより、表示部2の全体にわたり表示が行われる。
次に、センサ読出回路3におけるタッチ検出動作の詳細を説明する。
次に、本実施の形態の比較例に係る表示装置について説明する。本比較例は、トランジスタスイッチCSWが省かれたセンサ読出回路を用いてディスプレイ装置1xを構成したものである。なお、本実施の形態に係るディスプレイ装置1と実質的に同一の部分は同一の符号を付し、適宜説明を省略する。
以上のように、本実施の形態では、常に順次走査により1水平ラインごとのタッチ検出動作を行い、各1水平ラインでのタッチ検出結果において、タッチ有りと判定されたときのみパラレル-シリアル変換動作を行い、シリアルデータを外部に転送するようにしたので、消費電力を抑えつつ、高い応答性能を実現できる。
次に、本実施の形態の変形例に係る表示装置について説明する。本比較例は、表示動作とタッチ検出動作とで、配線を共用しない表示部を用いてディスプレイ1Sを構成したものである。なお、本実施の形態に係るディスプレイ装置1と実質的に同一の部分は同一の符号を付し、適宜説明を省略する。
次に、本発明の第2の実施の形態に係る表示装置について説明する。本実施の形態に係るディスプレイ装置1Aは、ライン反転駆動する表示装置に適用され、共通駆動信号COMに基づいてAC的にプリチャージ動作を行う場合でも、タッチ検出動作を行うことができるようにしたものである。なお、上記第1の実施の形態に係るディスプレイ装置1と実質的に同一の構成部分には同一の符号を付し、適宜説明を省略する。
図9は、本実施の形態の表示装置におけるセンサ読出回路40の回路構成例を表すものである。センサ読出回路40は、動作部41を備えている。
図10は、ディスプレイ装置1Aのタイミング波形図の一例を表すものであり、(A)は水平同期信号HDの波形を示し、(B)は書き込みイネーブルパルスENBの波形を示し、(C)はセレクト信号SELの波形を示し、(D)は信号線SGLの電圧Sigの波形を示し、(E)はプリチャージ信号Preの波形を示し、(F)はリード信号Readの波形を示し、(G)はクロック停止信号clk_endの波形を示し、(H)は転送クロックSCK1の波形を示し、(I)は転送クロックSCK2の波形を示す。図10の左半分はタッチがあるときの動作を表すものであり、図10の右半分はタッチが無いときの動作を表すものである。
以上のように、本実施の形態では、Dタイプフリップフロップ332の出力とトランジスタスイッチCSWとの間に排他的論理和回路XORを設けるようにしたので、ライン反転駆動を行う表示装置であってもタッチ検出を行うことができる。その他の効果は、上記第1の実施の形態の場合と同様である。
次に、本発明の第3の実施の形態に係る表示装置について説明する。本実施の形態に係るディスプレイ装置1Bは、ライン反転駆動する表示装置に適用され、さらに、タッチの有無の状態によりセンサ読出回路による検出動作の頻度などを動的に変更できるようにしたものである。なお、上記第1および第2の実施の形態に係るディスプレイ装置と実質的に同一の構成部分には同一の符号を付し、適宜説明を省略する。
図11は、本実施の形態の表示装置におけるセンサ読出回路50の回路構成例を表すものである。センサ読出回路50は、動作部51と、制御IO部52とを備えている。
次に、図12および図13を参照して、ディスプレイ装置1Bの動作および作用を説明する。
以上のように、本実施の形態では、制御回路ブロック38を設けるようにしたので、タッチパネルの使用状況に応じてタッチパネルの動作モードを変更することにより、タッチパネルを使用する際の利便性を維持しつつ、効率よく低消費電力化を実現することができる。その他の効果は、上記第1および第2の実施の形態の場合と同様である。
次に、本発明の第4の実施の形態に係る表示装置について説明する。本実施の形態に係るディスプレイ装置1Cは、センサ読出回路がパラレル-シリアル変換機能を有していないセンサ読出回路を用いてディスプレイ装置を構成したものである。なお、上記第1および第2の実施の形態に係るディスプレイ装置と実質的に同一の構成部分には同一の符号を付し、適宜説明を省略する。
次に、図16~図20を参照して、上記実施の形態で説明したディスプレイ装置の適用例について説明する。上記実施の形態のディスプレイ装置は、テレビジョン装置、デジタルカメラ、ノート型パーソナルコンピュータ、携帯電話等の携帯端末装置あるいはビデオカメラなどのあらゆる分野の電子機器に適用することが可能である。言い換えると、上記実施の形態のディスプレイ装置は、外部から入力された映像信号あるいは内部で生成した映像信号を、画像あるいは映像として表示するあらゆる分野の電子機器に適用することが可能である。
図16は、上記実施の形態のディスプレイ装置が適用されるテレビジョン装置の外観を表すものである。このテレビジョン装置は、例えば、フロントパネル511およびフィルターガラス512を含む映像表示画面部510を有しており、この映像表示画面部510は、上記実施の形態に係るディスプレイ装置により構成されている。
図17は、上記実施の形態のディスプレイ装置が適用されるデジタルカメラの外観を表すものである。このデジタルカメラは、例えば、フラッシュ用の発光部521、表示部522、メニュースイッチ523およびシャッターボタン524を有しており、その表示部522は、上記実施の形態に係るディスプレイ装置により構成されている。
図18は、上記実施の形態のディスプレイ装置が適用されるノート型パーソナルコンピュータの外観を表すものである。このノート型パーソナルコンピュータは、例えば、本体531、文字等の入力操作のためのキーボード532および画像を表示する表示部533を有しており、その表示部533は、上記実施の形態に係るディスプレイ装置により構成されている。
図19は、上記実施の形態のディスプレイ装置が適用されるビデオカメラの外観を表すものである。このビデオカメラは、例えば、本体部541、この本体部541の前方側面に設けられた被写体撮影用のレンズ542、撮影時のスタート/ストップスイッチ543および表示部544を有している。そして、その表示部544は、上記実施の形態に係るディスプレイ装置により構成されている。
図20は、上記実施の形態のディスプレイ装置が適用される携帯電話機の外観を表すものである。この携帯電話機は、例えば、上側筐体710と下側筐体720とを連結部(ヒンジ部)730で連結したものであり、ディスプレイ740、サブディスプレイ750、ピクチャーライト760およびカメラ770を有している。そのディスプレイ740またはサブディスプレイ750は、上記実施の形態に係るディスプレイ装置により構成されている。
以上、いくつかの実施の形態および電子機器への適用例を挙げて本発明を説明したが、本発明はこれらの実施の形態等には限定されず、種々の変形が可能である。
上記の各実施の形態等では、タッチセンサとして接触式タッチセンサを用いたが、これに限定されるものではない。例えば、接触式タッチセンサに代えて静電容量式タッチセンサを用いてもよい。
また、上記の各実施の形態等において、接触式タッチセンサに代えて光学式タッチセンサを用いてもよい。
また、上記実施の形態等では、信号線SGLを利用してタッチセンサの出力信号を表示部から取り出すようにしたが、これに限定されるものではない。例えば、図8に示したように、センサ読み出し用の専用線(センサ線)を設けて、タッチセンサの出力信号を表示部から取り出すようにしてもよい。この場合でも、上記実施の形態等と同様に、消費電力を抑えつつ、高い応答性能を実現でき、また、ディスプレイ装置の小型化を実現できる。
Claims (20)
- 複数の映像信号線にそれぞれ供給された映像信号に基づいて表示を行う複数の表示素子と、
外部近接物体の存在を示すタッチ信号を複数のセンサ信号線にそれぞれ出力する複数のセンサ素子と、
前記タッチ信号をそれぞれ検出する検出部と、
前記検出部の検出結果を外部に転送出力する転送出力部と、
前記検出部と前記転送出力部の動作を制御し、前記検出部において前記タッチ信号が検出された場合に前記転送出力部を動作させ、前記タッチ信号が検出されない場合に前記転送出力部の動作を停止させる制御部と
を備えた表示装置。 - 前記転送出力部は、前記検出部の検出結果を並列から直列に変換して転送出力する
請求項1に記載の表示装置。 - 前記検出部は、前記複数のセンサ素子が配置されたタッチ検出領域全体を複数の領域に分けて、各領域について順次時分割的に前記タッチ信号を検出し、
前記制御部は、前記複数の領域のうち前記タッチ信号が検出されない領域に対応する期間において、前記転送出力部の動作を停止させる
請求項2に記載の表示装置。 - 前記複数のセンサ素子は、前記タッチ検出領域において水平方向および垂直方向にマトリックス状に配置され、前記領域は水平方向に配置された複数のセンサ素子を含む
請求項3に記載の表示装置。 - 前記制御部は、所定の期間にわたって前記検出部において前記タッチ信号が検出されないときに、前記検出部の検出動作の一部をも停止させる
請求項1に記載の表示装置。 - 前記検出部は、前記タッチ信号を所定の頻度でのサンプリングによりそれぞれ検出し、
前記制御部は、所定の期間にわたって前記検出部において前記タッチ信号が検出されないときに、前記検出部および前記転送出力部における動作頻度を低下させる
請求項1に記載の表示装置。 - 前記制御部は、映像表示のフレーム数をカウントし、1または複数のフレームの期間にわたって前記検出部において前記タッチ信号が検出されない場合は前記検出部および前記転送出力部における動作頻度を低下させ、その後前記タッチ信号が検出された際にはカウント動作の計数値をリセットし、低下させた前記動作頻度をもとに戻す
請求項6に記載の表示装置。 - 前記制御部は、前記1または複数のフレームの期間にわたって前記検出部において前記タッチ信号が検出されない場合は、所定数のフレームごとに前記検出部および前記転送出力部を動作させる第1の動作モードに移行し、その後前記タッチ信号が検出された場合は、全てのフレームにおいて前記検出部および前記転送出力部を動作させる第2の動作モードに移行する
請求項7に記載の表示装置。 - 前記センサ信号線が前記映像信号線と共用され、
初期化期間において前記複数のセンサ信号線の全てに同時に初期化信号を印加する初期化部を備え、
前記検出部は、前記初期化期間のあとに続く期間のうち、前記映像信号が前記センサ信号線に印加される映像信号印加期間以外の期間において前記タッチ信号の検出を行う
請求項2に記載の表示装置。 - 前記制御部は、
前記検出部において前記タッチ信号が検出されると起動信号を発生し、つぎに前記初期化部による初期化信号が印加されると停止信号を発生する制御信号発生部と、
前記起動信号と前記停止信号に基づいて、前記転送出力部に与える転送クロック信号と、前記検出部に与える検出起動信号とを発生制御する動作信号制御部と
を有する
請求項9に記載の表示装置。 - 前記初期化信号として、常時一定の電圧レベルをもつ直流信号が用いられる
請求項9に記載の表示装置。 - 前記表示素子は、
前記映像信号が供給される画素電極と、
前記複数の表示素子に共通に印加される共通信号が供給される駆動電極と、
前記画素電極の電圧と前記駆動電極の電圧との電位差に応じて駆動される液晶層と
を有する液晶表示素子であり、
前記センサ素子は、前記画素電極および前記駆動電極により構成される接触式センサ素子であり、
前記検出部は、外部近接物体による押圧により前記画素電極と前記駆動電極とが近接しあるいは接触した結果生じる前記センサ信号線の電圧変化を前記タッチ信号として検出する
請求項9に記載の表示装置。 - 前記液晶表示素子は、前記電位差の極性が一定の期間ごとに反転する極性反転駆動により駆動され、
前記初期化信号として、前記一定の期間ごとに電位が変化する前記共通信号に基づいた信号が用いられ、
前記検出部と前記制御信号発生部との間に、前記初期化信号に基づいて前記検出部の検出結果の有効論理を生成し、前記制御信号発生部に出力する論理ゲート回路が挿入されている
請求項12に記載の表示装置。 - 前記センサ素子は、静電容量を形成する電極を有し、外部近接物体に応じて変化する静電容量に基づいて、前記センサ信号線に信号を出力する静電容量式センサ素子である
請求項1に記載の表示装置。 - 前記センサ素子は、光を検出してその光量に応じた信号を出力する受光素子を有し、外部近接物体に応じて変化する受光素子の出力信号に基づいて、前記センサ信号線に信号を出力する光学式センサ素子である
請求項1に記載の表示装置。 - 前記表示素子は、EL表示素子である
請求項1に記載の表示装置。 - 外部近接物体の存在を示すタッチ信号を複数のセンサ信号線にそれぞれ出力する複数のセンサ素子と、
前記タッチ信号をそれぞれ検出する検出部と、
前記検出部の検出結果を外部に転送出力する転送出力部と、
前記検出部と前記転送出力部の動作を制御し、前記検出部において前記タッチ信号が検出された場合に前記転送出力部を動作させ、前記タッチ信号が検出されない場合に前記転送出力部の動作を停止させる制御部と
を備えたタッチパネル。 - 前記転送出力部は、前記検出部の検出結果を並列から直列に変換して転送出力する
請求項17に記載の表示装置。 - 外部近接物体を検出するタッチセンサ機能を有する表示装置と、
前記タッチセンサ機能により入力された情報に基づいて所定の処理を行う処理部と
を備え、
前記表示装置が、
複数の映像信号線にそれぞれ供給された映像信号に基づいて表示を行う複数の表示素子と、
外部近接物体の存在を示すタッチ信号を複数のセンサ信号線にそれぞれ出力する複数のセンサ素子と、
前記タッチ信号をそれぞれ検出する検出部と、
前記検出部の検出結果を外部に転送出力する転送出力部と、
前記検出部と前記転送出力部の動作を制御し、前記検出部において前記タッチ信号が検出された場合に前記転送出力部を動作させ、前記タッチ信号が検出されない場合に前記転送出力部の動作を停止させる制御部と
を有する電子機器。 - 外部近接物体を検出するタッチパネルと、
前記タッチパネルにより入力された情報に基づいて所定の処理を行う処理部と
を備え、
前記タッチパネルが、
外部近接物体の存在を示すタッチ信号を複数のセンサ信号線にそれぞれ出力する複数のセンサ素子と、
前記タッチ信号をそれぞれ検出する検出部と、
前記検出部の検出結果を外部に転送出力する転送出力部と、
前記検出部と前記転送出力部の動作を制御し、前記検出部において前記タッチ信号が検出された場合に前記転送出力部を動作させ、前記タッチ信号が検出されない場合に前記転送出力部の動作を停止させる制御部と
を有する電子機器。
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Also Published As
Publication number | Publication date |
---|---|
TW201037648A (en) | 2010-10-16 |
US20110043483A1 (en) | 2011-02-24 |
JPWO2010098199A1 (ja) | 2012-08-30 |
JP5439467B2 (ja) | 2014-03-12 |
TWI420437B (zh) | 2013-12-21 |
US8860687B2 (en) | 2014-10-14 |
CN102239466B (zh) | 2015-09-16 |
CN102239466A (zh) | 2011-11-09 |
KR101613327B1 (ko) | 2016-04-18 |
KR20110127057A (ko) | 2011-11-24 |
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