WO2013024786A1 - Touch panel control circuit, drive circuit for display device, display device, and touch panel control method - Google Patents

Touch panel control circuit, drive circuit for display device, display device, and touch panel control method Download PDF

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Publication number
WO2013024786A1
WO2013024786A1 PCT/JP2012/070354 JP2012070354W WO2013024786A1 WO 2013024786 A1 WO2013024786 A1 WO 2013024786A1 JP 2012070354 W JP2012070354 W JP 2012070354W WO 2013024786 A1 WO2013024786 A1 WO 2013024786A1
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WO
WIPO (PCT)
Prior art keywords
touch panel
signal
liquid crystal
switching
drive signal
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PCT/JP2012/070354
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French (fr)
Japanese (ja)
Inventor
岡田　厚志
坂本　敦
浜田　浩
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シャープ株式会社
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Publication of WO2013024786A1 publication Critical patent/WO2013024786A1/en

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    • 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
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds

Definitions

  • the present invention relates to a touch panel control circuit, a display device drive circuit including the touch panel control circuit, a display device, and a touch panel control method, and particularly to a touch panel and a parallax barrier in a display device including a touch panel and a parallax barrier.
  • the present invention relates to a technology related to a signal to be supplied.
  • Display devices equipped with a display panel such as a liquid crystal panel are used for portable terminal devices such as mobile phones and PDAs, and electronic devices such as computers and televisions.
  • a stereoscopic image referred to as a “parallax barrier (parallax barrier) method” that utilizes the difference in the appearance of both left and right eyes, that is, the characteristics of the human eye that senses a stereoscopic image from binocular parallax.
  • a device having a function of displaying is known.
  • a display device described in Patent Document 1 below is known.
  • the display device of Patent Document 1 includes a touch panel, a display panel such as a liquid crystal panel, and a switching liquid crystal (parallax barrier).
  • the display panel is configured such that the right-eye pixel and the left-eye pixel are respectively driven, and the right-eye pixel can be observed by the observer's right eye and the left-eye pixel can be observed by the left eye through a slit formed in the switching liquid crystal. It has become. Thereby, the observer can observe the stereoscopic image by the binocular parallax effect.
  • a common electrode on the common substrate that is formed and supplied with a signal (superposition signal) obtained by superimposing the touch panel drive signal and the switching liquid crystal drive signal.
  • the switching liquid crystal drive signal usually changes between two voltage levels at predetermined intervals in order to drive the liquid crystal with alternating current. For this reason, there may be a case where the touch panel drive signal overlaps when the level of the switching liquid crystal drive signal changes. In this case, noise may occur due to the level change of the switching liquid crystal drive signal. That is, when the touch panel and the common substrate are overlapped, a parasitic capacitance is usually formed in the overlapping direction. Therefore, when the level of the switching liquid crystal drive signal changes, the influence of the switching liquid crystal drive signal reaches the touch panel drive signal via the parasitic capacitance. This may cause a malfunction of the touch panel.
  • the present invention has been completed based on the above-described circumstances, and is a technique for suppressing the generation of noise when an overlay signal is generated by an unsynchronized touch panel drive signal and a switching liquid crystal drive signal. It is to provide.
  • a touch panel control circuit of the present invention includes a display panel, a touch panel arranged on the display surface side of the display panel, and a parallax barrier including a switching liquid crystal panel that enables three-dimensional display.
  • a touch panel control circuit for controlling the touch panel in the display device, the substrate comprising the touch panel and one of the two substrates constituting the switching liquid crystal panel being a common substrate in the display device; and A plurality of touch panel electrodes and a switching liquid crystal electrode are formed on the same plane of the common substrate, and the touch panel control circuit includes a touch panel drive signal generation circuit that generates a touch panel drive signal that drives the touch panel, and the switching Switching liquid crystal drive signal to drive the liquid crystal panel In response to the switching timing of the signal level of the switching liquid crystal drive signal, a stop signal for stopping the new generation of the touch panel drive signal in a predetermined stop period is generated, and the generation of the touch panel drive signal is A stop signal generation circuit for stopping in a predetermined stop period, and a switching signal for switching the switching liquid crystal drive signal to the touch panel drive signal and supplying the same to the shared substrate are generated corresponding to the generation period of the touch panel drive signal.
  • a switching signal generation circuit comprising: a switching signal generation circuit that stops generating a new switching signal
  • the new generation of the touch panel drive signal is stopped for a predetermined stop period corresponding to the switching timing of the signal level of the switching liquid crystal drive signal. Further, the generation of a new switching signal is stopped during a predetermined stop period in response to the stop signal. Therefore, even when a superposition signal obtained by superimposing the switching liquid crystal drive signal and the touch panel drive signal is supplied to the electrode on the common substrate, the superposition signal is generated at the switching timing of the signal level of the switching liquid crystal drive signal. It is avoided. As a result, it is possible to suppress the generation of noise when the overlay signal is generated by the touch panel drive signal and the switching liquid crystal drive signal that are not synchronized.
  • the stop signal generation circuit includes an edge detection circuit that detects a switching timing of a signal level of the switching liquid crystal driving signal, and an elapsed period from the switching timing, thereby measuring the switching liquid crystal And a counter that measures a switching interval period of the signal level of the driving signal, and the generation of the touch panel driving signal may be stopped before the elapsed period reaches the switching interval period.
  • the touch panel drive signal has a predetermined signal generation period. Therefore, by stopping the generation of the touch panel driving signal before the switching timing of the signal level of the switching liquid crystal driving signal, it is possible to avoid the switching timing being within the signal generation period of the touch panel driving signal.
  • the stop signal generation circuit may be configured to reduce the switching interval stored in the buffer circuit by a predetermined amount, and a buffer circuit that stores the switching interval measured by the counter.
  • a correction circuit for correcting, and a comparison circuit for generating the stop signal based on a comparison between the corrected switching interval and the elapsed period may be included.
  • the predetermined amount to be shortened may be determined by counting the length of the switching signal.
  • the predetermined amount may be determined by counting a length of the switching signal. In this case, even if the signal generation period of the touch panel drive signal varies, the predetermined amount can be automatically changed.
  • the touch panel drive signal may be formed in a plurality of generation periods having the same time length, and the predetermined stop period may be set to a period longer than the generation period. In this case, since the predetermined stop period of the touch panel drive signal is set to be longer than the generation period, it is possible to reliably avoid the switching timing of the switching liquid crystal drive signal being within the generation period of the touch panel drive signal.
  • the predetermined stop period may be set so as to include a switching timing of the signal level of the switching liquid crystal drive signal.
  • a display device driving circuit includes any one of the touch panel control circuit, a switching liquid crystal driving signal generation circuit that generates the switching liquid crystal driving signal, and the switching liquid crystal driving signal according to the switching signal.
  • a superposition circuit that generates a superposition signal by switching to a signal and supplies the superposition signal to the common substrate. According to this configuration, it is possible to suitably generate the overlay signal.
  • the common substrate is formed with a common electrode in which a touch panel electrode and a switching liquid crystal electrode are shared, and the superposition circuit supplies the superposition signal to the common electrode. Good. According to this configuration, the electrodes can be shared on the shared substrate, and wiring on the shared substrate is simplified.
  • the display device may include a display device drive circuit having any one of the above-described configurations.
  • the display panel may be a liquid crystal display panel using liquid crystal.
  • Such a display device can be applied as a liquid crystal display device to various uses, for example, a mobile phone, a smartphone, a portable game machine, a notebook computer, a desktop screen of a television or a personal computer, and is suitable for a display screen of various sizes. .
  • the touch panel control method controls the touch panel in a display device having a display panel, a touch panel disposed on a display surface side of the display panel, and a parallax barrier including a switching liquid crystal panel that enables three-dimensional display.
  • a touch panel control method wherein in the display device, a substrate constituting the touch panel and one of two substrates constituting the switching liquid crystal panel are used as a common substrate, and a plurality of touch panel electrodes and switching liquid crystal The electrodes are formed on the same plane of the common substrate, and the touch panel control method includes a touch panel drive signal generation step for generating a touch panel drive signal for driving the touch panel, and a switching liquid crystal drive signal for driving the switching liquid crystal panel.
  • a touch panel drive signal generation stop step for stopping the new generation of the touch panel drive signal in a predetermined stop period in response to the switching timing of the signal level of the crystal drive signal, and the switching liquid crystal drive signal as the touch panel drive signal.
  • a switching signal generation step of generating a switching signal for switching and supplying to the shared substrate corresponding to a generation period of the touch panel drive signal, and switching for stopping generation of the new switching signal in the predetermined stop period Signal generation stop process.
  • Sectional drawing which shows schematic structure of the display apparatus which concerns on one Embodiment
  • the top view which shows typically the electrode on the common substrate in one Embodiment
  • the top view which shows typically the electrode for 2nd switching liquid crystal panels with which the display apparatus of FIG. 1 is equipped.
  • the top view which shows the electrode for 2nd touchscreens typically The block diagram which shows schematically the structure which concerns on the production
  • the schematic time chart which shows the signal of each electrode in one embodiment 1 is a block diagram schematically showing a stop signal generation circuit in an embodiment. Schematic time chart relating to generation of common electrode signal in one embodiment Block diagram schematically showing another stop signal generation circuit
  • the liquid crystal display device 10 (an example of a display device) is illustrated.
  • the liquid crystal display device 10 is used as an information display element of various electronic devices (not shown) such as a portable information terminal, a mobile phone, a notebook computer, and a portable game machine.
  • a part of each drawing shows an X axis, a Y axis, and a Z axis.
  • the long side direction of the liquid crystal display device 10 is an X axis direction
  • the short side direction is a Y axis direction.
  • 1 is the Z-axis direction (front and back direction, direction perpendicular to the screen), and the upper side of FIG. 1 is the front side and the lower side of FIG.
  • the liquid crystal display device 10 has a rectangular shape (or square shape) in plan view as a whole, and as shown in FIG. 1, a backlight device 11, a liquid crystal display panel (an example of a display panel) 20, and switching The liquid crystal panel 30, the touch panel 50, and the drive circuit 80 (refer FIG. 5) are comprised mainly.
  • the liquid crystal display panel 20, the switching liquid crystal panel 30, and the touch panel 50 are laminated in this order from the side close to the backlight device 11. That is, the touch panel 50 and the switching liquid crystal panel 30 are arranged on the display surface side of the liquid crystal display panel 20.
  • the liquid crystal display panel 20, the switching liquid crystal panel 30, and the touch panel 50 are connected to the drive circuit 80 of the liquid crystal display device 10 through a flexible substrate (not shown), for example.
  • the backlight device 11 includes a light source (for example, a cold-cathode tube or an LED (not shown)), a light guide plate, and a directivity control film in a substantially box-shaped chassis that opens toward the front side (the liquid crystal display panel 20 side).
  • a light source for example, a cold-cathode tube or an LED (not shown)
  • a light guide plate for example, a light guide plate
  • a directivity control film in a substantially box-shaped chassis that opens toward the front side (the liquid crystal display panel 20 side).
  • a diffusion sheet, a reflection sheet, and the like are accommodated as necessary, and have a function of emitting light to the liquid crystal display panel 20 side.
  • the liquid crystal display panel 20 includes a pair of transparent (translucent) glass substrates 21 and 22 and liquid crystal molecules that are interposed between both the substrates 21 and 22 and whose optical characteristics change as an electric field is applied.
  • a liquid crystal layer (not shown). Both substrates 21 and 22 are bonded together with a sealing agent (not shown) while maintaining a gap corresponding to the thickness of the liquid crystal layer.
  • the liquid crystal display panel 20 displays an image with a frame frequency of 60 Hz, for example.
  • the front side (upper side in FIG. 1) is a CF (color filter) substrate 21 and the back side (back side) is a TFT substrate 22 (element substrate).
  • a TFT Thin Film Transistor
  • a number of pixel electrodes which are switching elements, are provided side by side (not shown).
  • a grid-like gate wiring and source wiring are disposed so as to surround them. The gate wiring and the source wiring are connected to the gate electrode and the source electrode of the TFT, respectively, and the pixel electrode is connected to the drain electrode of the TFT.
  • the CF substrate 21 is provided with a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in an array corresponding to each pixel.
  • a light shielding layer black matrix for preventing color mixture is formed between the colored portions constituting the color filter.
  • a counter electrode facing the pixel electrode on the TFT substrate 22 side is provided on the surface of the color filter and the light shielding layer.
  • alignment films for aligning liquid crystal molecules contained in the liquid crystal layer are formed on the inner surfaces of both the substrates 21 and 22, respectively.
  • polarizing plates (not shown) are disposed on the outer surface sides of both the substrates 21 and 22, respectively.
  • the switching liquid crystal panel 30 and the touch panel 50 are integrally disposed on the front side (the upper side in FIG. 1) of the liquid crystal display panel 20.
  • the switching liquid crystal panel 30 is disposed adjacent to the liquid crystal display panel 20 so as to be able to switch between two-dimensional display and three-dimensional display.
  • the switching liquid crystal panel 30 includes transparent (translucent) glass substrates 31, 32, a liquid crystal layer (not shown) interposed between the glass substrates 31, 32, and a polarizing plate disposed outside the liquid crystal layer. (Not shown).
  • a substrate far from the liquid crystal display panel 20 hereinafter referred to as “common substrate” 32 is also a substrate constituting the touch panel 50, that is, common to the switching liquid crystal panel 30 and the touch panel 50. Used for.
  • the switching liquid crystal panel 30 includes two types of switching liquid crystal panel electrodes 34 and 35 having different extending directions for applying a voltage to the liquid crystal layer interposed between the substrates 31 and 32.
  • Each electrode 34 and 35 is a transparent electrode.
  • the first switching liquid crystal panel electrode 34 provided on the shared substrate 32 on the touch panel 50 side is arranged in the Y-axis direction (one side of the liquid crystal display device 10 as shown in FIG. 2.
  • the first switching liquid crystal panel electrode 34 is formed by arranging a plurality of pairs of comb-shaped electrodes 34A and 34B in the X-axis direction, for example, 16 pairs in this embodiment.
  • an extending portion 34B1 (shape extending in the Y-axis direction) of the other electrode 34B is arranged between the extending portion 34A1 (shape extending in the Y-axis direction) of one electrode 34A.
  • Each of the electrodes 34A and 34B is composed of, for example, 25 extending portions 34A1 and 34B1.
  • the first switching liquid crystal panel electrode 34 also constitutes a part of a transparent electrode of the touch panel 50 described later. That is, the first switching liquid crystal panel electrode 34 is an electrode commonly used for the switching liquid crystal panel 30 and the touch panel 50, and may be referred to as a common electrode 34 in the following description.
  • the second switching liquid crystal panel electrode 35 provided on the glass substrate 31 has a shape extending along the X-axis direction as shown in FIG.
  • the second switching liquid crystal panel electrode 35 includes a pair of comb-shaped electrodes 35A and 35B arranged in the X-axis direction.
  • an extending portion 35B1 (shape extending in the X-axis direction) of the other electrode 35B is disposed between the extending portions 35A1 (shape extending in the X-axis direction) of one electrode 35A. Is formed.
  • FIG. 3 only a part of the pair of electrodes 35A and 35B is shown.
  • a switching liquid crystal drive signal SW (in this case, a positive and negative symmetrical rectangular wave), which is a parallax barrier drive signal, is applied to one of the pair of electrodes 34A and 34B constituting the first switching liquid crystal panel electrode 34, for example, the electrode 34A.
  • the switching liquid crystal panel 30 emits light (from the backlight device 11 to the liquid crystal display panel only at a location corresponding to the extending portion 34A1 of the electrode 34A. 20), so-called normally white.
  • the switching liquid crystal panel 30 can be viewed with landscape (horizontal) parallax. It can function as a barrier, and three-dimensional display is possible.
  • a switching liquid crystal drive signal SW (in this case, a positive and negative symmetric rectangular wave) is applied to one of the pair of electrodes 35A and 35B constituting the transparent electrode 35 for the second switching liquid crystal panel, for example, the electrode 35A.
  • the switching liquid crystal panel electrodes 34A and 34B are grounded, the switching liquid crystal panel 30 transmits light (the liquid crystal display panel 20 from the backlight device 11 to the light transmitting portion) only at a position (light transmission portion) corresponding to the extending portion 35A1 of the electrode 35A. It is configured to block light that passes through. Accordingly, it is possible to visually recognize the display of a specific pixel group in the liquid crystal display panel 20 and the display of other pixel groups in the left eye. That is, the switching liquid crystal panel 30 can be displayed as a portrait (vertical) parallax. It can function as a barrier, and three-dimensional display is possible.
  • a parallax barrier in the long side direction and the short side direction of the liquid crystal display device 10 can be formed.
  • 3D display can be performed in two states, vertical screen and horizontal screen.
  • the right-eye pixel and the left-eye pixel can be displayed on the liquid crystal display panel 20, respectively, and the right eye for the right eye of the user of the liquid crystal display device 10 through the light transmission portion formed on the switching liquid crystal panel 30.
  • the pixel is configured such that the left eye pixel can be observed with the left eye. Further, by not applying a predetermined AC voltage to the first switching liquid crystal panel electrode 34 and the second switching liquid crystal panel electrode 35, almost the entire surface of the switching liquid crystal panel 30 becomes a light transmitting portion, and two-dimensional display can be performed. Is possible.
  • an AC voltage there are a method of using a positive and negative symmetrical rectangular wave of about ⁇ 5 V and a method of generating unipolar rectangular waves having opposite phases at about 0/5 V.
  • this method when an in-phase AC voltage is applied to the electrodes 34 and 35 on both sides of the switching liquid crystal layer, no voltage is applied to the liquid crystal layer, and when a reverse-phase voltage is applied, an AC voltage is applied to the liquid crystal layer. A voltage is applied and its transmittance changes.
  • the touch panel 50 is formed on both upper and lower surfaces of the common substrate 32 and includes touch panel electrodes 51 and 52 which are transparent electrodes.
  • touch panel electrodes 51 and 52 which are transparent electrodes.
  • the common electrode 34 formed on the lower surface of the shared substrate 32 and extending along the Y-axis direction is used as the first touch panel electrode 51.
  • the second touch panel electrode 52 is formed on the upper surface of the common substrate 32 and extends along the X-axis direction (a direction intersecting the first touch panel electrode 51).
  • the touch panel 50 has data (for example, the touch panel 50) by a change in capacitance between the first touch panel electrode 51 (common electrode 34) and the second touch panel transparent electrode 52 generated by pointing the surface of the touch panel 50 with a finger or the like.
  • the coordinate data (above) is input.
  • the touch panel 50 in this embodiment is of a mutual capacitance detection method (Mutual capacitance Sensing), for example. That is, when the user's finger touches the touch panel 50 while sequentially applying the touch panel drive signal Txn having a predetermined number of pulses to the first touch panel electrode 34A, the capacitance in the detection circuit loop changes. To do.
  • the cross-point between the first touch panel electrode 34A and the second touch panel transparent electrode 52 that causes the change in capacitance is, for example, a current waveform flowing through the second touch panel transparent electrode 52, and It is specified from the application timing of the touch panel drive signal Txn.
  • the shared substrate 32 is shared by the touch panel 50 and the switching liquid crystal panel 30. Further, paying attention to the point that the touch panel 50 and the switching liquid crystal panel 30 both require a transparent electrode extending in the Y-axis direction, the transparent electrode (34A or 34B) extending in the Y-axis direction in both the panels 30, 50 is a common electrode. Shared as (common electrode).
  • the liquid crystal display device 10 includes a drive circuit (an example of a display device drive circuit) 80.
  • the drive circuit 80 further includes a display panel drive unit (not shown) that drives the liquid crystal display panel 20, a backlight drive unit (not shown) that drives the backlight device 11, and the like.
  • FIG. 6 shows an example of a time chart of signals applied to the wirings 34 and 35 of the common substrate 32.
  • the period T1 time t1 to t2
  • the period T2 time t2 to t3 which is 5V, that is, the duty ratio of the liquid crystal drive signal SW is 50%.
  • T1 time t1 to t2
  • T3 time t2 to t3 which is 5V, that is, the duty ratio of the liquid crystal drive signal SW is 50%.
  • the present embodiment for example, since 16 common electrodes 34A are provided on the common substrate 32, 16 common electrode signals (SC1 to SC16) corresponding to the respective common electrodes 34A are generated. .
  • the common electrode signal SCn generated by switching a part of the switching liquid crystal drive signal (hereinafter simply referred to as “liquid crystal drive signal”) SW to the touch panel drive signal Txn is generated on the lower surface of the common substrate 32.
  • a part of the plurality of electrodes 34A and 34B is applied to the plurality of electrodes 34A.
  • the period of the touch panel drive signal Txn in each common electrode signal SCn is different. That is, the touch panel drive signal Txn is sequentially applied to the electrode 34A.
  • an example in which all the electrodes 34A among a plurality (16 in this case) of electrodes 34A are used as the common electrode 34A is shown, but the present invention is not limited to this.
  • a part of the plurality of electrodes 34A may be used as the common electrode 34A.
  • eight of the 16 electrodes 34A may be used as the common electrode 34A, and the other eight electrodes 34A may be used as electrodes for the liquid crystal drive signal SW only.
  • the common electrode signal SCn (SC1 to SC16) is applied to each common electrode 34A, and the liquid crystal drive signal included in the common electrode signal SCn is applied to the electrode 34B.
  • a liquid crystal drive signal SW (hereinafter simply referred to as “reverse phase liquid crystal drive signal SW-R”), which is a rectangular wave with the same amplitude and opposite phase as SW, is applied.
  • the liquid crystal drive signal SW is, for example, a rectangular wave having a frequency of 60 Hz and a voltage of 5V.
  • the same liquid crystal drive signal SW as that of the electrode 34A is applied to the electrodes 35A and 35B.
  • a parallax barrier is formed by the electrode 34B.
  • the common electrode signal SCn is applied to the common electrode 34A, and the reverse phase liquid crystal drive signal SW-R is applied to the electrode 35B. Further, the same liquid crystal drive signal SW as that of the electrode 34A is applied to the electrodes 34B and 35A. In the case of FIG. 6, a parallax barrier is formed by the electrode 35B.
  • the touch panel controller 60 is configured by, for example, an ASIC (application-specific IC), and as illustrated in FIG. 5, a switching signal generation circuit 61, a touch panel drive signal generation circuit 62, a synchronization signal generation circuit 63, and A stop signal generation circuit 90 and the like are included.
  • ASIC application-specific IC
  • the switching signal generation circuit 61 switches the switching liquid crystal driving signal SW for driving the switching liquid crystal panel 30 to the touch panel driving signal Txn and designates a switching signal SEL for specifying a switching period for supplying the common substrate 32 to the touch panel driving signal Txn. It is generated corresponding to the generation timing.
  • the switching signal SEL is a pulse signal having a predetermined cycle as shown in FIG. 8 and includes 16 pulses per touch panel signal cycle. Note that the switching signal generation circuit 61 may be provided outside the touch panel controller 60.
  • each touch panel drive signal Txn is a signal corresponding to each switching signal SEL, and includes a predetermined number of pulses in a predetermined period (pulse generation period) K1.
  • each touch panel drive signal Txn is shown separately, but the touch panel drive signal generation circuit 62 continuously generates the touch panel drive signal Txn at a predetermined interval in synchronization with the switching signal SEL.
  • Each touch panel drive signal Txn is sent to the overlay circuit 70 corresponding to each pulse generation period K1.
  • the synchronization signal generation circuit 63 generates a synchronization signal SYN that starts an operation of switching the liquid crystal drive signal SW to the touch panel drive signal Txn at a predetermined cycle.
  • the switching signal SEL, the touch panel drive signal Txn, and the synchronization signal SYN are supplied to the overlay circuit 70.
  • FIG. 7 is a block diagram schematically showing the configuration of the stop signal generation circuit 90.
  • the stop signal generation circuit 90 includes an edge detection circuit 91, a counter 92, a buffer circuit 93, a register 94, a subtractor 95, a coincidence detection circuit 96, and a flip-flop circuit 97, as shown in FIG.
  • the edge detection circuit 91 receives the liquid crystal drive signal SW from the SW signal generation circuit 81 and detects the edge of the liquid crystal drive signal SW. For example, when the falling edge of the liquid crystal drive signal SW is detected at time t 1 in FIG. 6, the edge detection circuit 91 generates the edge detection signal Ed and supplies the edge detection signal Ed to the counter 92 and the buffer circuit 93. The counter 92 starts counting based on the edge detection signal Ed. The counter 92 counts a predetermined clock signal Clk and measures a predetermined time.
  • the count value CN of the counter 92 is supplied to the buffer circuit 93. Then, the edge detection circuit 91 clears the count value CN of the counter 92 based on the edge detection signal Ed corresponding to the rising edge of the liquid crystal drive signal SW at time t2 in FIG. At time t2, the buffer circuit 93 stores the count value CT before the counter 92 is cleared based on the edge detection signal Ed.
  • the count value CT before clearing is the time information of the liquid crystal drive signal SW between edges (time t1 to t2), that is, the half period (corresponding to “switching interval”) T1 of the liquid crystal drive signal SW. It is equal to the time information of the other half cycle T2 (time t2 to t3) of SW. Therefore, when the count value CN of the counter 92 approaches the count value CT stored in the buffer circuit 93 from time t2, it indicates that the next edge time t3 of the liquid crystal drive signal SW is approaching. That is, the edge time of the liquid crystal drive signal SW can be predicted by comparing the current count value CN of the counter 92 with the stored count value CT. Thereby, the overlap of the edge of the liquid crystal drive signal SW and the touch panel drive signal Txn can be avoided, and the generation of noise due to the overlap can be avoided.
  • the touch panel drive signal Txn is usually composed of a predetermined pulse generation period K1 and a plurality of continuous pulses as shown in FIG. 8, and the touch panel drive signal Txn is generated in the middle of the pulse. I can't stop. Therefore, it is necessary to detect that the edge timing of the liquid crystal drive signal SW is approaching in anticipation of the pulse generation period K1 of the touch panel drive signal Txn. That is, for example, when an edge of the liquid crystal drive signal SW occurs at time t3 in FIGS. 6 and 8, generation of a new touch panel drive signal Txn must be stopped before the pulse generation period K1 from time t3.
  • correction corresponding to the pulse generation period K1 is performed on the count value CT stored in the buffer circuit 93.
  • a correction value Kh that is the correction period is set in the register 94.
  • the correction value Kh is provided to the subtractor 95.
  • the subtractor 95 generates a correction count value Ch by subtracting a count value corresponding to the correction value Kh from the count value CT, and uses the correction count value Ch as the coincidence detection circuit 96. To supply.
  • the coincidence detection circuit 96 compares the current count value CN from the counter 92 with the correction count value Ch. When the current count value CN reaches the correction count value Ch, the coincidence detection circuit 96 generates a trigger signal Stg for starting generation of the stop signal ST in the flip-flop circuit 97, and the trigger signal Stg is flip-flops. Supply to circuit 97. This time corresponds to the time (t2-1) in FIG.
  • the flip-flop circuit 97 In response to the trigger signal Stg, the flip-flop circuit 97 generates a stop signal ST for stopping the generation of the touch panel drive signal Txn for a predetermined stop time K2, and the stop signal ST is switched to the switching signal generation circuit 61 and the touch panel drive signal generation circuit. 62.
  • the stop period K2 is a period from the time (t2-1) in FIG. 8 to the edge timing time t3 of the liquid crystal drive signal SW, and is longer than the pulse generation period K1. In other words, the pulse generation period K1 and the stop period K2 have a relationship of K1 ⁇ K2. Note that the period corresponding to the count correction value Kh corresponds to the stop period K2.
  • the switching signal generation circuit 61 When receiving the stop signal ST, the switching signal generation circuit 61 newly raises the switching signal SEL from the low level (L) to the high level (H) during the stop period K2, as shown in FIG. Stop that. That is, the touch panel drive signal Txn is newly prohibited from being output to the common electrode 34 in the stop period K2.
  • the switching signal SEL is set to the H level at time t4 in FIG. 8 after a predetermined time has elapsed from the edge timing time t3 of the liquid crystal drive signal SW. Note that the switching signal SEL and the touch panel driving signal Txn are synchronized, and the switching signal SEL needs to be output during the period (pulse generation period) K1 during which the touch panel driving signal Txn is output. That is, the H level period of the pulse generation period K1 switching signal SEL is a period corresponding to the pulse generation period K1.
  • the touch panel drive signal generation circuit 62 When the touch panel drive signal generation circuit 62 receives the stop signal ST, as shown in FIG. 8, the touch panel drive signal generation circuit 62 stops generating the touch panel drive signal Tx (n + 3) during the stop period K2, and from time t4 in FIG. Generation of the touch panel drive signal Tx (n + 3) is started. Then, after time t4, the touch panel drive signal Tx (n + 3) is output to the common electrode 34. Therefore, it is avoided that the edge timing time t3 of the liquid crystal drive signal SW overlaps with the output period of the touch panel drive signal Tx (n + 3).
  • the SW signal generation circuit 81 generates a liquid crystal drive signal SW and supplies the liquid crystal drive signal SW to the overlay circuit 70. Further, as shown in FIG. 8, the overlay circuit 70 switches the liquid crystal drive signal SW to the touch panel drive signal Txn (Tx1 to Tx16) in response to the switching signal SEL, and outputs the overlay signal SCn (SC1 to SC16). Then, the overlapping signal SCn is generated and supplied to the common substrate 32. Specifically, the overlay circuit 70 sequentially scans and supplies each overlay signal (SC1 to SC16) to each common electrode 34A of the corresponding common substrate 32 in a time-sharing manner.
  • the overlay circuit 70 includes, for example, a shift register that shifts the switching signal SEL and a data selection circuit that selects either the touch panel drive signal Txn or the liquid crystal drive signal SW.
  • the touch panel drive signal Txn is composed of a plurality of pulse signals, and has a predetermined signal generation period K1 (see FIG. 8). Therefore, by stopping the new generation of the touch panel drive signal Txn before the switching timing of the signal level of the liquid crystal driving signal SW (see time (t2-1) in FIG. 8), the switching timing is changed to the touch panel driving signal Txn.
  • the generation period K1 can be avoided.
  • the correction amount Kh for shortening the switching intervals T1 and T2 of the liquid crystal drive signal SW it is possible to correspond to the generation intervals K1 of the switching intervals T1 and T2 of the liquid crystal drive signal or the touch panel drive signal Txn. . That is, simply by changing the setting of the correction amount Kh, the switching intervals T1 and T2 of various liquid crystal drive signals SW, that is, the periods T1 and T2 of the liquid crystal drive signals SW, or various touch panel drive signals Txn, It can be reliably avoided that the switching timing is within the signal generation period K1 of the touch panel drive signal Txn.
  • the stop period K2 of the touch panel drive signal Txn is set to a period longer than the generation period K1. Therefore, even when the generation of the touch panel drive signal Txn is started immediately before time (t2-1) in FIG. 8, the switching timing of the liquid crystal drive signal SW is within the generation period K1 of the touch panel drive signal Txn. This can be avoided reliably.
  • the overlapping signal SCn of the liquid crystal driving signal SW and the touch panel driving signal Txn is avoided while avoiding the switching timing of the liquid crystal driving signal SW. Is generated. Therefore, when the overlay signal SCn is generated, it is possible to reliably avoid the switching timing of the liquid crystal drive signal SW being within the generation period of the touch panel drive signal Txn.
  • the present invention is not limited to this. That is, it may be the case where the duty ratio of the liquid crystal drive signal SW is not 50% (when the period T1 and the period T2 are not equal).
  • two buffers 93 are provided.
  • the buffer 93A is associated with the period T1 where the liquid crystal drive signal SW is 0V
  • the buffer 93A is associated with the period T2 where the liquid crystal drive signal SW is 5V.
  • 93B is made to correspond.
  • the buffers 93A and 93B are toggled according to the periods T1 and T2, the count correction value Kh is set in the register 94 according to the periods T1 and T2, and stopped according to the periods T1 and T2.
  • a period K2 may be provided.
  • the stop period K2 for stopping the generation of the new touch panel drive signal Txn is the period from time (t2-1) to time t3 shown in FIG. 8, but is not limited thereto.
  • the end time of the stop period K2 may be a predetermined time after time t3 and close to time t3. In this case, since the stop period K2 of the touch panel drive signal Txn is continued after the switching timing, it is possible to more reliably avoid the switching timing of the liquid crystal drive signal SW being within the generation period of the touch panel drive signal.
  • ⁇ is an arbitrary count number. That is, the stop signal ST may be generated when the current count value CN approaches the correction count value Ch.
  • the count correction value Kh (pulse generation period K1) is determined by counting the H level period of the switching signal SEL that is a period corresponding to the pulse generation period K1, and the determined count correction value is determined.
  • the count correction value Kh set in the register 94 may be updated by Kh. That is, the predetermined amount to be shortened may be determined by counting the length of the switching signal SEL. In this case, the count correction value Kh is automatically rewritten even when the pulse generation period K1 changes due to the change of the operation clock frequency.
  • the electrode 34A is the common electrode among the plurality of electrodes 34A and 34B provided on the lower surface of the common substrate 32
  • the present invention is not limited thereto, and the electrode 34B is used as the common electrode. It may be used.
  • the display screen is vertically arranged (portrait mode) or horizontally (landscape mode).
  • the present invention is not limited to this. Absent.
  • the electrode 35 on the glass substrate 31 does not need to be patterned and may be a solid electrode.
  • the present invention can be applied to a signal applied to the barrier electrode formed on the glass substrate (common substrate) 32.
  • a liquid crystal display device using a liquid crystal panel as the display panel has been illustrated, but the present invention can also be applied to other types of display panels, for example, display devices using an EL panel.
  • SYMBOLS 10 Liquid crystal display device (display apparatus), 20 ... Liquid crystal display panel (display panel), 30 ... Switching liquid crystal panel (parallax barrier), 32 ... Shared substrate, 34A ... Common electrode, 50 ... Touch panel, 60 ... Touch panel controller, 61 ... Switching signal generation circuit, 62 ... Touch panel drive signal generation circuit, 70 ... Overlay circuit, 80 ... Drive circuit (drive circuit of display device), 81 ... Switching liquid crystal drive generation circuit, 90 ... Stop signal generation circuit, 91 ... Edge Detection circuit, 92 ... counter, 93 ... buffer circuit, 94 ... register (correction circuit), 95 ... subtractor (correction circuit), 96 ... coincidence detection circuit (comparison circuit), 97 ... flip-flop circuit (comparison circuit)

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Abstract

This touch panel control circuit (60) comprises a switch signal generation circuit (61), a touch panel drive signal generation circuit (62) for generating touch panel drive signals (Tx1-Tx16) for driving a touch panel, and a stop signal generation circuit (90). The stop signal generation circuit (90) receives a switching liquid crystal drive signal (SW), and generates a stop signal (ST) for stopping the generation of the touch panel drive signals (Tx1-Tx16) for a predetermined stop period at the timing at which the signal level of the switching liquid crystal drive signal (SW) changes. In response to the stop signal (ST), the switch signal generation circuit stops generation of new switch signals (SEL) for the predetermined stop period.

Description

タッチパネル制御回路、表示装置の駆動回路、表示装置、およびタッチパネル制御方法Touch panel control circuit, display device drive circuit, display device, and touch panel control method
　本発明は、タッチパネル制御回路、そのタッチパネル制御回路を備えた、表示装置の駆動回路、表示装置、およびにタッチパネル制御方法に関し、特に、タッチパネルおよび視差バリアを備えた表示装置において、タッチパネルおよび視差バリアに供給する信号に係る技術に関する。 The present invention relates to a touch panel control circuit, a display device drive circuit including the touch panel control circuit, a display device, and a touch panel control method, and particularly to a touch panel and a parallax barrier in a display device including a touch panel and a parallax barrier. The present invention relates to a technology related to a signal to be supplied.
　携帯電話やＰＤＡなどの携帯用の端末装置、コンピュータやテレビなどの電子機器には、液晶パネルなどの表示パネルを備えた表示装置が用いられている。このような表示装置において、左右両眼の見え方の相違、いわゆる両眼視差から立体像を感知する人間の目の特性を利用した「パララックスバリア（視差バリア）方式」と称される立体映像を表示する機能を備えたものが知られている。このような立体映像を表示する機能を備えた表示装置の一例としては、下記特許文献１に記載されたものが知られている。 Display devices equipped with a display panel such as a liquid crystal panel are used for portable terminal devices such as mobile phones and PDAs, and electronic devices such as computers and televisions. In such a display device, a stereoscopic image referred to as a “parallax barrier (parallax barrier) method” that utilizes the difference in the appearance of both left and right eyes, that is, the characteristics of the human eye that senses a stereoscopic image from binocular parallax. A device having a function of displaying is known. As an example of a display device having a function of displaying such a stereoscopic image, a display device described in Patent Document 1 below is known.
　上記特許文献１の表示装置は、タッチパネルを備えるとともに、液晶パネルなどの表示パネルと、スイッチング液晶（視差バリア）を備えている。表示パネルには、右目用画素と左目用画素がそれぞれ駆動され、スイッチング液晶に形成されたスリットを介して、観察者の右目で右目用画素を、左目で左目用画素を観察可能とする構成となっている。これにより、観察者は、両眼視差効果による立体映像を観察することができる。 The display device of Patent Document 1 includes a touch panel, a display panel such as a liquid crystal panel, and a switching liquid crystal (parallax barrier). The display panel is configured such that the right-eye pixel and the left-eye pixel are respectively driven, and the right-eye pixel can be observed by the observer's right eye and the left-eye pixel can be observed by the left eye through a slit formed in the switching liquid crystal. It has become. Thereby, the observer can observe the stereoscopic image by the binocular parallax effect.
特開２００４－２７２３５４号公報JP 2004-272354 A
（発明が解決しようとする課題）
　上記構成のように、立体映像を表示する表示装置においては、二次元の映像のみを表示可能な表示装置に比べて構成部品が増加し、全体の厚さや重さが増加する。さらに、タッチパネルなどの入力装置を備えている場合、さらに厚さや重さが増加してしまう。そのため、タッチパネルおよび立体映像を表示する機能を備えつつ、薄型化および軽量化を実現するために、例えば、タッチパネルおよび視差バリアを、一枚の共通基板（共用基板）を共有することで一体部品として形成し、タッチパネル駆動信号と、スイッチング液晶駆動信号とが重ね合わされた信号（重ね合せ信号）が供給される共通電極を共通基板に設けることが考えられる。
　しかしながら、通常、タッチパネル駆動信号とスイッチング液晶駆動信号とは個別に生成されるものであるため、各信号は同期していない。また、スイッチング液晶駆動信号は、通常、液晶を交流駆動するために、所定周期毎に２つの電圧レベルの間で変化する。そのため、スイッチング液晶駆動信号のレベル変化時とタッチパネル駆動信号とが重なり合う場合が考えられ、その場合、スイッチング液晶駆動信号のレベル変化に起因してノイズが発生する虞があった。すなわち、タッチパネルと共通基板とが重ねられることにより、通常、重ねられる方向に寄生容量が形成される。そのため、その寄生容量を介して、スイッチング液晶駆動信号のレベル変化時において、スイッチング液晶駆動信号の影響がタッチパネル駆動信号に及ぶこととなる。それは、タッチパネルの誤動作の要因となる虞があった。 (Problems to be solved by the invention)
As in the above configuration, in a display device that displays a stereoscopic image, the number of components increases and the overall thickness and weight increase compared to a display device that can display only two-dimensional images. Further, when an input device such as a touch panel is provided, the thickness and weight are further increased. Therefore, in order to realize a thin and light weight while having a function of displaying a touch panel and a stereoscopic image, for example, the touch panel and the parallax barrier are integrated as a single component by sharing a single common substrate (common substrate). It is conceivable to form a common electrode on the common substrate that is formed and supplied with a signal (superposition signal) obtained by superimposing the touch panel drive signal and the switching liquid crystal drive signal.
However, since the touch panel drive signal and the switching liquid crystal drive signal are normally generated separately, the signals are not synchronized. In addition, the switching liquid crystal drive signal usually changes between two voltage levels at predetermined intervals in order to drive the liquid crystal with alternating current. For this reason, there may be a case where the touch panel drive signal overlaps when the level of the switching liquid crystal drive signal changes. In this case, noise may occur due to the level change of the switching liquid crystal drive signal. That is, when the touch panel and the common substrate are overlapped, a parasitic capacitance is usually formed in the overlapping direction. Therefore, when the level of the switching liquid crystal drive signal changes, the influence of the switching liquid crystal drive signal reaches the touch panel drive signal via the parasitic capacitance. This may cause a malfunction of the touch panel.
　本発明は上記のような事情に基づいて完成されたものであって、同期しないタッチパネル駆動信号とスイッチング液晶駆動信号とによって重ね合せ信号を生成する際に、ノイズを発生させることを抑制する技術を提供するものである。 The present invention has been completed based on the above-described circumstances, and is a technique for suppressing the generation of noise when an overlay signal is generated by an unsynchronized touch panel drive signal and a switching liquid crystal drive signal. It is to provide.
（課題を解決するための手段）
　上記課題を解決するために、本発明のタッチパネル制御回路は、表示パネルと、前記表示パネルの表示面側に配されたタッチパネルと、３次元表示を可能とするスイッチング液晶パネルからなる視差バリアとを有する表示装置における前記タッチパネルを制御するタッチパネル制御回路であって、前記表示装置において、前記タッチパネルを構成する基板と、前記スイッチング液晶パネルを構成する二枚の基板の一方とが共用基板とされ、かつ複数のタッチパネル用電極とスイッチング液晶用電極が前記共用基板の同一平面上に形成されており、該タッチパネル制御回路は、前記タッチパネルを駆動するタッチパネル駆動信号を生成するタッチパネル駆動信号生成回路と、前記スイッチング液晶パネルを駆動するスイッチング液晶駆動信号を受け取り、前記スイッチング液晶駆動信号の信号レベルの切替わりタイミングに対応して、前記タッチパネル駆動信号の新たな生成を所定の停止期間において停止させる停止信号を生成し、前記タッチパネル駆動信号の生成を前記所定停止期間に停止させる停止信号生成回路と、前記スイッチング液晶駆動信号を前記タッチパネル駆動信号と切替えて前記共用基板に供給するための切替え信号を、前記タッチパネル駆動信号の生成期間に対応して生成する切替え信号生成回路であって、前記停止信号に応じて、前記所定停止期間の間において、新たな前記切替え信号の生成を停止する切替え信号生成回路とを備える。 (Means for solving the problem)
In order to solve the above problems, a touch panel control circuit of the present invention includes a display panel, a touch panel arranged on the display surface side of the display panel, and a parallax barrier including a switching liquid crystal panel that enables three-dimensional display. A touch panel control circuit for controlling the touch panel in the display device, the substrate comprising the touch panel and one of the two substrates constituting the switching liquid crystal panel being a common substrate in the display device; and A plurality of touch panel electrodes and a switching liquid crystal electrode are formed on the same plane of the common substrate, and the touch panel control circuit includes a touch panel drive signal generation circuit that generates a touch panel drive signal that drives the touch panel, and the switching Switching liquid crystal drive signal to drive the liquid crystal panel In response to the switching timing of the signal level of the switching liquid crystal drive signal, a stop signal for stopping the new generation of the touch panel drive signal in a predetermined stop period is generated, and the generation of the touch panel drive signal is A stop signal generation circuit for stopping in a predetermined stop period, and a switching signal for switching the switching liquid crystal drive signal to the touch panel drive signal and supplying the same to the shared substrate are generated corresponding to the generation period of the touch panel drive signal. A switching signal generation circuit, comprising: a switching signal generation circuit that stops generating a new switching signal during the predetermined stop period in response to the stop signal.
　この構成によると、スイッチング液晶駆動信号の信号レベルの切替わりタイミングに対応してタッチパネル駆動信号の新たな生成が所定停止期間、停止される。また、停止信号に応じて、所定停止期間の間において、新たな切替え信号の生成が停止される。そのため、スイッチング液晶駆動信号とタッチパネル駆動信号とを重ね合せた重ね合せ信号を共用基板上の電極に供給する場合においても、スイッチング液晶駆動信号の信号レベルの切替わりタイミングに重ね合せ信号が生成されることが回避される。その結果、同期しないタッチパネル駆動信号とスイッチング液晶駆動信号とによって重ね合せ信号を生成する際に、ノイズを発生させることを抑制することができる。 According to this configuration, the new generation of the touch panel drive signal is stopped for a predetermined stop period corresponding to the switching timing of the signal level of the switching liquid crystal drive signal. Further, the generation of a new switching signal is stopped during a predetermined stop period in response to the stop signal. Therefore, even when a superposition signal obtained by superimposing the switching liquid crystal drive signal and the touch panel drive signal is supplied to the electrode on the common substrate, the superposition signal is generated at the switching timing of the signal level of the switching liquid crystal drive signal. It is avoided. As a result, it is possible to suppress the generation of noise when the overlay signal is generated by the touch panel drive signal and the switching liquid crystal drive signal that are not synchronized.
　上記タッチパネル制御回路において、前記停止信号生成回路は、前記スイッチング液晶駆動信号の信号レベルの切替わりタイミングを検出するエッジ検出回路と、前記切替わりタイミングからの経過期間を計測することによって、前記スイッチング液晶駆動信号の信号レベルの切替わり間隔期間を計測するカウンタとを含み、前記経過期間が前記切替わり間隔期間に達する以前に前記タッチパネル駆動信号の生成を停止させるようにしてもよい。 In the touch panel control circuit, the stop signal generation circuit includes an edge detection circuit that detects a switching timing of a signal level of the switching liquid crystal driving signal, and an elapsed period from the switching timing, thereby measuring the switching liquid crystal And a counter that measures a switching interval period of the signal level of the driving signal, and the generation of the touch panel driving signal may be stopped before the elapsed period reaches the switching interval period.
　通常、タッチパネル駆動信号は所定の信号発生期間を有している。そのため、スイッチング液晶駆動信号の信号レベルの切替わりタイミング以前からタッチパネル駆動信号の生成を停止することによって、切替わりタイミングがタッチパネル駆動信号の信号発生期間内となることを回避できる。 Usually, the touch panel drive signal has a predetermined signal generation period. Therefore, by stopping the generation of the touch panel driving signal before the switching timing of the signal level of the switching liquid crystal driving signal, it is possible to avoid the switching timing being within the signal generation period of the touch panel driving signal.
　また、上記タッチパネル制御回路において、前記停止信号生成回路は、前記カウンタによって計測された前記切替わり間隔を格納するバッファ回路と、前記バッファ回路に格納された前記切替わり間隔を所定量短縮するように補正する補正回路と、補正された前記切替わり間隔と前記経過期間との比較に基づいて前記停止信号を生成する比較回路とを含むようにしてもよい。 In the touch panel control circuit, the stop signal generation circuit may be configured to reduce the switching interval stored in the buffer circuit by a predetermined amount, and a buffer circuit that stores the switching interval measured by the counter. A correction circuit for correcting, and a comparison circuit for generating the stop signal based on a comparison between the corrected switching interval and the elapsed period may be included.
　この場合、スイッチング液晶駆動信号の切替わり間隔を短縮する補正量を適宜設定することによって、スイッチング液晶駆動信号の切替わり間隔、あるいはタッチパネル駆動信号の信号発生期間に対応させることができる。すなわち、単に補正量を設定変更するだけで、各種のスイッチング液晶駆動信号の切替わり間隔、すなわちスイッチング液晶駆動信号の周期、あるいは各種のタッチパネル駆動信号に対応して、切替わりタイミングがタッチパネル駆動信号の信号発生期間内となることを確実に回避できる。
　なお、短縮する所定量が切替え信号の長さをカウントすることによって決定されるようにしてもよい。 In this case, by appropriately setting a correction amount for shortening the switching interval of the switching liquid crystal driving signal, it is possible to correspond to the switching interval of the switching liquid crystal driving signal or the signal generation period of the touch panel driving signal. That is, by simply changing the correction amount, the switching timing of the switching liquid crystal drive signal, that is, the cycle of the switching liquid crystal drive signal, or the various touch panel drive signals is changed to the touch timing of the touch panel drive signal. It is possible to surely avoid being within the signal generation period.
Note that the predetermined amount to be shortened may be determined by counting the length of the switching signal.
　上記タッチパネル制御回路において、前記所定量が前記切替え信号の長さをカウントすることによって決定されるようにしてもよい。この場合、タッチパネル駆動信号の信号発生期間が変動する場合であっても、所定量の変更を自動的に行える。
　また、上記タッチパネル制御回路において、前記タッチパネル駆動信号は、同一の時間長である複数の生成期間において形成され、前記所定停止期間は、前記生成期間より長い期間に設定されるようにしてもよい。　
　この場合、タッチパネル駆動信号の所定停止期間がその生成期間より長い期間に設定されるため、スイッチング液晶駆動信号の切替わりタイミングがタッチパネル駆動信号の生成期間内となることを確実に回避できる。 In the touch panel control circuit, the predetermined amount may be determined by counting a length of the switching signal. In this case, even if the signal generation period of the touch panel drive signal varies, the predetermined amount can be automatically changed.
In the touch panel control circuit, the touch panel drive signal may be formed in a plurality of generation periods having the same time length, and the predetermined stop period may be set to a period longer than the generation period.
In this case, since the predetermined stop period of the touch panel drive signal is set to be longer than the generation period, it is possible to reliably avoid the switching timing of the switching liquid crystal drive signal being within the generation period of the touch panel drive signal.
　また、上記タッチパネル制御回路において、前記所定停止期間は、前記スイッチング液晶駆動信号の信号レベルの切替わりタイミングを含むように設定されるようにしてもよい。 In the touch panel control circuit, the predetermined stop period may be set so as to include a switching timing of the signal level of the switching liquid crystal drive signal.
　この場合、タッチパネル駆動信号の生成停止期間が切替わりタイミング以後も継続されるため、スイッチング液晶駆動信号の切替わりタイミングがタッチパネル駆動信号の生成期間内となることを、さらに確実に回避できる。 In this case, since the generation stop period of the touch panel drive signal continues after the switching timing, it is possible to more reliably avoid the switching timing of the switching liquid crystal drive signal being within the generation period of the touch panel drive signal.
　また、表示装置の駆動回路は、上記いずれかのタッチパネル制御回路と、前記スイッチング液晶駆動信号を生成するスイッチング液晶駆動信号生成回路と、前記切替え信号に応じて、前記スイッチング液晶駆動信号を前記タッチパネル駆動信号に切替えて重ね合せ信号を生成し、該重ね合せ信号を前記共用基板に供給する、重ね合せ回路とを備える。
　この構成によると、重ね合せ信号を好適に生成することができる。 In addition, a display device driving circuit includes any one of the touch panel control circuit, a switching liquid crystal driving signal generation circuit that generates the switching liquid crystal driving signal, and the switching liquid crystal driving signal according to the switching signal. And a superposition circuit that generates a superposition signal by switching to a signal and supplies the superposition signal to the common substrate.
According to this configuration, it is possible to suitably generate the overlay signal.
　上記、前記共用基板には、タッチパネル用電極とスイッチング液晶用電極とを共通化した共通電極が形成されており、前記重ね合せ回路は、前記重ね合せ信号を前記共通電極に供給するようにしてもよい。
　この構成によると、共用基板上で電極を共有化することができ、共用基板上での配線が簡易化される。 The common substrate is formed with a common electrode in which a touch panel electrode and a switching liquid crystal electrode are shared, and the superposition circuit supplies the superposition signal to the common electrode. Good.
According to this configuration, the electrodes can be shared on the shared substrate, and wiring on the shared substrate is simplified.
　また、表示装置が、上記のいずれかの構成の表示装置の駆動回路を備えていることとすることができる。その際、前記表示パネルが液晶を用いた液晶表示パネルとすることができる。
　このような表示装置は液晶表示装置として、種々の用途、例えば携帯電話、スマートフォン、携帯型ゲーム機、ノートパソコン、テレビやパソコンのデスクトップ画面等に適用でき、各種サイズの表示画面用として好適である。 Further, the display device may include a display device drive circuit having any one of the above-described configurations. At that time, the display panel may be a liquid crystal display panel using liquid crystal.
Such a display device can be applied as a liquid crystal display device to various uses, for example, a mobile phone, a smartphone, a portable game machine, a notebook computer, a desktop screen of a television or a personal computer, and is suitable for a display screen of various sizes. .
　また、タッチパネル制御方法は、表示パネルと、前記表示パネルの表示面側に配されたタッチパネルと、３次元表示を可能とするスイッチング液晶パネルからなる視差バリアとを有する表示装置における前記タッチパネルを制御するタッチパネル制御方法であって、前記表示装置において、前記タッチパネルを構成する基板と、前記スイッチング液晶パネルを構成する二枚の基板の一方とが共用基板とされ、かつ複数のタッチパネル用電極とスイッチング液晶用電極が前記共用基板の同一平面上に形成されており、該タッチパネル制御方法は、前記タッチパネルを駆動するタッチパネル駆動信号を生成するタッチパネル駆動信号生成工程と、前記スイッチング液晶パネルを駆動するスイッチング液晶駆動信号を受け取り、前記スイッチング液晶駆動信号の信号レベルの切替わりタイミングに対応して、前記タッチパネル駆動信号の新たな生成を所定の停止期間において停止させるタッチパネル駆動信号生成停止工程と、前記スイッチング液晶駆動信号を前記タッチパネル駆動信号と切替えて前記共用基板に供給するための切替え信号を、前記タッチパネル駆動信号の生成期間に対応して生成する切替え信号生成工程と、前記所定停止期間において、新たな前記切替え信号の生成を停止する切替え信号生成停止工程とを含む。 The touch panel control method controls the touch panel in a display device having a display panel, a touch panel disposed on a display surface side of the display panel, and a parallax barrier including a switching liquid crystal panel that enables three-dimensional display. A touch panel control method, wherein in the display device, a substrate constituting the touch panel and one of two substrates constituting the switching liquid crystal panel are used as a common substrate, and a plurality of touch panel electrodes and switching liquid crystal The electrodes are formed on the same plane of the common substrate, and the touch panel control method includes a touch panel drive signal generation step for generating a touch panel drive signal for driving the touch panel, and a switching liquid crystal drive signal for driving the switching liquid crystal panel. Receiving the switching A touch panel drive signal generation stop step for stopping the new generation of the touch panel drive signal in a predetermined stop period in response to the switching timing of the signal level of the crystal drive signal, and the switching liquid crystal drive signal as the touch panel drive signal. A switching signal generation step of generating a switching signal for switching and supplying to the shared substrate corresponding to a generation period of the touch panel drive signal, and switching for stopping generation of the new switching signal in the predetermined stop period Signal generation stop process.
（発明の効果）
　本発明によれば、同期しないタッチパネル駆動信号とスイッチング液晶駆動信号とによって重ね合せ信号を生成する際に、ノイズを発生させることを抑制することができる。 (The invention's effect)
ADVANTAGE OF THE INVENTION According to this invention, when producing | generating a superposition signal by the touch panel drive signal and switching liquid crystal drive signal which are not synchronized, it can suppress generating a noise.
一実施形態に係る表示装置の概略構成を示す断面図Sectional drawing which shows schematic structure of the display apparatus which concerns on one Embodiment 一実施形態における共用基板上の電極を模式的に示す平面図The top view which shows typically the electrode on the common substrate in one Embodiment 図１の表示装置が備える第２スイッチング液晶パネル用電極を模式的に示す平面図The top view which shows typically the electrode for 2nd switching liquid crystal panels with which the display apparatus of FIG. 1 is equipped. 第２のタッチパネル用電極を模式的に示す平面図The top view which shows the electrode for 2nd touchscreens typically 一実施形態における共通電極信号の生成に係る構成を概略的に示すブロック図The block diagram which shows schematically the structure which concerns on the production | generation of the common electrode signal in one Embodiment 一実施形態におけるにおける各電極の信号を示す概略的なタイムチャートThe schematic time chart which shows the signal of each electrode in one embodiment 一実施形態における停止信号生成回路を概略的に示すブロック図1 is a block diagram schematically showing a stop signal generation circuit in an embodiment. 一実施形態における共通電極信号の生成に係る概略的なタイムチャートSchematic time chart relating to generation of common electrode signal in one embodiment 別の停止信号生成回路を概略的に示すブロック図Block diagram schematically showing another stop signal generation circuit
　本発明による一実施形態を、図１ないし図８を参照して説明する。本実施形態では、液晶表示装置１０（表示装置の一例）について例示する。液晶表示装置１０は、例えば、携帯型情報端末、携帯電話、ノートパソコン、携帯型ゲーム機などの各種電子機器（図示せず）の情報表示素子として用いられる。なお、各図面の一部にはＸ軸、Ｙ軸およびＺ軸を示しており、液晶表示装置１０の長辺方向をＸ軸方向、短辺方向をＹ軸方向としている。また、図１における上下方向をＺ軸方向（表裏方向、画面に垂直な方向）としており、図１の上側を表側とするとともに図１の下側を裏側とする。
１．液晶表示装置の全体構成
　液晶表示装置１０は、全体として平面視矩形状（又は方形状）をなし、図１に示すように、バックライト装置１１、液晶表示パネル（表示パネルの一例）２０、スイッチング液晶パネル３０、タッチパネル５０および駆動回路８０（図５参照）を主体に構成されている。その積層構成として、バックライト装置１１に近い側から、液晶表示パネル２０、スイッチング液晶パネル３０、タッチパネル５０の順に積層されている。つまり、タッチパネル５０およびスイッチング液晶パネル３０は、液晶表示パネル２０の表示面側に配されている。また、液晶表示パネル２０、スイッチング液晶パネル３０、タッチパネル５０は例えばフレキシブル基板（図示せず）を介して液晶表示装置１０の駆動回路８０に接続されている。 An embodiment according to the present invention will be described with reference to FIGS. In the present embodiment, the liquid crystal display device 10 (an example of a display device) is illustrated. The liquid crystal display device 10 is used as an information display element of various electronic devices (not shown) such as a portable information terminal, a mobile phone, a notebook computer, and a portable game machine. A part of each drawing shows an X axis, a Y axis, and a Z axis. The long side direction of the liquid crystal display device 10 is an X axis direction, and the short side direction is a Y axis direction. 1 is the Z-axis direction (front and back direction, direction perpendicular to the screen), and the upper side of FIG. 1 is the front side and the lower side of FIG. 1 is the back side.
1. Overall Configuration of Liquid Crystal Display Device The liquid crystal display device 10 has a rectangular shape (or square shape) in plan view as a whole, and as shown in FIG. 1, a backlight device 11, a liquid crystal display panel (an example of a display panel) 20, and switching The liquid crystal panel 30, the touch panel 50, and the drive circuit 80 (refer FIG. 5) are comprised mainly. As the laminated structure, the liquid crystal display panel 20, the switching liquid crystal panel 30, and the touch panel 50 are laminated in this order from the side close to the backlight device 11. That is, the touch panel 50 and the switching liquid crystal panel 30 are arranged on the display surface side of the liquid crystal display panel 20. Moreover, the liquid crystal display panel 20, the switching liquid crystal panel 30, and the touch panel 50 are connected to the drive circuit 80 of the liquid crystal display device 10 through a flexible substrate (not shown), for example.
　バックライト装置１１は、表側（液晶表示パネル２０側）に向けて開口した略箱形をなすシャーシ内に光源（例えば冷陰極管やＬＥＤなど（図示せず））、導光板、指向性制御フィルム、拡散シート、反射シートなどが必要に応じて収容されたもので、液晶表示パネル２０側に光を出射する機能を担っている。 The backlight device 11 includes a light source (for example, a cold-cathode tube or an LED (not shown)), a light guide plate, and a directivity control film in a substantially box-shaped chassis that opens toward the front side (the liquid crystal display panel 20 side). A diffusion sheet, a reflection sheet, and the like are accommodated as necessary, and have a function of emitting light to the liquid crystal display panel 20 side.
　液晶表示パネル２０は、一対の透明な（透光性を有する）ガラス製の基板２１，２２と、両基板２１，２２間に介在し、電界印加に伴って光学特性が変化する液晶分子を含む液晶層（図示せず）とを備えている。両基板２１，２２は液晶層の厚さ分のギャップを維持した状態で図示しないシール剤によって貼り合わされている。液晶表示パネル２０は、例えば、６０Ｈｚのフレーム周波数で画像表示される。 The liquid crystal display panel 20 includes a pair of transparent (translucent) glass substrates 21 and 22 and liquid crystal molecules that are interposed between both the substrates 21 and 22 and whose optical characteristics change as an electric field is applied. A liquid crystal layer (not shown). Both substrates 21 and 22 are bonded together with a sealing agent (not shown) while maintaining a gap corresponding to the thickness of the liquid crystal layer. The liquid crystal display panel 20 displays an image with a frame frequency of 60 Hz, for example.
　両基板２１，２２のうち表側（図１における上側）がＣＦ（カラーフィルタ）基板２１とされ、裏側（背面側）がＴＦＴ基板２２（素子基板）とされる。ＴＦＴ基板２２における内面側（液晶層側、ＣＦ基板２１との対向面側）には、スイッチング素子であるＴＦＴ（Thin Film Transistor、薄膜トランジスタ）および画素電極が多数個並んで設けられる（図示せず）。これらＴＦＴおよび画素電極の周りには、格子状をなすゲート配線及びソース配線が取り囲むようにして配設されている。ゲート配線とソース配線とがそれぞれＴＦＴのゲート電極とソース電極とに接続され、画素電極がＴＦＴのドレイン電極に接続されている。 Of the substrates 21 and 22, the front side (upper side in FIG. 1) is a CF (color filter) substrate 21 and the back side (back side) is a TFT substrate 22 (element substrate). On the inner surface side (the liquid crystal layer side, the surface facing the CF substrate 21) of the TFT substrate 22, a TFT (Thin Film Transistor) and a number of pixel electrodes, which are switching elements, are provided side by side (not shown). . Around these TFTs and pixel electrodes, a grid-like gate wiring and source wiring are disposed so as to surround them. The gate wiring and the source wiring are connected to the gate electrode and the source electrode of the TFT, respectively, and the pixel electrode is connected to the drain electrode of the TFT.
　一方、ＣＦ基板２１には、Ｒ（赤色），Ｇ（緑色），Ｂ（青色）等の各着色部が各画素に対応した配列で配置されたカラーフィルタが設けられている。カラーフィルタをなす各着色部間には、混色を防ぐための遮光層（ブラックマトリクス）が形成されている。カラーフィルタおよび遮光層の表面には、ＴＦＴ基板２２側の画素電極と対向する対向電極が設けられている。また、両基板２１，２２の内面側には、液晶層に含まれる液晶分子を配向させるための配向膜がそれぞれ形成されている。なお、両基板２１，２２の外面側には、それぞれ図示しない偏光板が配されている。 On the other hand, the CF substrate 21 is provided with a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in an array corresponding to each pixel. A light shielding layer (black matrix) for preventing color mixture is formed between the colored portions constituting the color filter. A counter electrode facing the pixel electrode on the TFT substrate 22 side is provided on the surface of the color filter and the light shielding layer. Further, alignment films for aligning liquid crystal molecules contained in the liquid crystal layer are formed on the inner surfaces of both the substrates 21 and 22, respectively. Note that polarizing plates (not shown) are disposed on the outer surface sides of both the substrates 21 and 22, respectively.
　このような液晶表示パネル２０の表側（図１における上側）には、スイッチング液晶パネル３０とタッチパネル５０とが一体となって配置されている。 The switching liquid crystal panel 30 and the touch panel 50 are integrally disposed on the front side (the upper side in FIG. 1) of the liquid crystal display panel 20.
　スイッチング液晶パネル３０は、液晶表示パネル２０と隣接して配され、２次元表示と３次元表示とを切替え可能とするものである。スイッチング液晶パネル３０は、透明な（透光性を有する）ガラス基板３１，３２と、ガラス基板３１，３２間に介在する液晶層（図示せず）、当該液晶層の外側に配される偏光板（図示せず）を備えている。なお、両ガラス基板３１，３２のうち、液晶表示パネル２０から遠い側の基板（以下「共用基板」という）３２は、タッチパネル５０を構成する基板でもあり、すなわちスイッチング液晶パネル３０とタッチパネル５０に共通に用いられる。 The switching liquid crystal panel 30 is disposed adjacent to the liquid crystal display panel 20 so as to be able to switch between two-dimensional display and three-dimensional display. The switching liquid crystal panel 30 includes transparent (translucent) glass substrates 31, 32, a liquid crystal layer (not shown) interposed between the glass substrates 31, 32, and a polarizing plate disposed outside the liquid crystal layer. (Not shown). Of the two glass substrates 31 and 32, a substrate far from the liquid crystal display panel 20 (hereinafter referred to as “common substrate”) 32 is also a substrate constituting the touch panel 50, that is, common to the switching liquid crystal panel 30 and the touch panel 50. Used for.
　スイッチング液晶パネル３０は、基板３１，３２間に介在する液晶層に電圧を印加するための、延設方向の異なる２種類のスイッチング液晶パネル用電極３４、３５を備えている。各電極３４，３５は透明電極である。 The switching liquid crystal panel 30 includes two types of switching liquid crystal panel electrodes 34 and 35 having different extending directions for applying a voltage to the liquid crystal layer interposed between the substrates 31 and 32. Each electrode 34 and 35 is a transparent electrode.
　スイッチング液晶パネル用電極３４，３５のうち、タッチパネル５０側であって共用基板３２に設けられる第１スイッチング液晶パネル用電極３４は、図２に示すように、Ｙ軸方向（液晶表示装置１０の一辺方向）に沿って延びる形状をなしている。具体的には、第１スイッチング液晶パネル用電極３４は、櫛形状をなす一対の電極３４Ａ、３４ＢがＸ軸方向に複数組、例えば、本実施形態では１６組配列されてなる。一対の電極３４Ａ、３４Ｂは、一方の電極３４Ａの延設部３４Ａ１（Ｙ軸方向に延びる形状）間に他方の電極３４Ｂの延設部３４Ｂ１（Ｙ軸方向に延びる形状）が配される形で形成されている。各電極３４Ａ、３４Ｂは、それぞれ、例えば２５本の延設部３４Ａ１、３４Ｂ１から構成される。 Of the switching liquid crystal panel electrodes 34 and 35, the first switching liquid crystal panel electrode 34 provided on the shared substrate 32 on the touch panel 50 side is arranged in the Y-axis direction (one side of the liquid crystal display device 10 as shown in FIG. 2. Direction). Specifically, the first switching liquid crystal panel electrode 34 is formed by arranging a plurality of pairs of comb-shaped electrodes 34A and 34B in the X-axis direction, for example, 16 pairs in this embodiment. In the pair of electrodes 34A and 34B, an extending portion 34B1 (shape extending in the Y-axis direction) of the other electrode 34B is arranged between the extending portion 34A1 (shape extending in the Y-axis direction) of one electrode 34A. Is formed. Each of the electrodes 34A and 34B is composed of, for example, 25 extending portions 34A1 and 34B1.
　なお、第１スイッチング液晶パネル用電極３４は、後述するタッチパネル５０の透明電極の一部を構成するものでもある。すなわち、第１スイッチング液晶パネル用電極３４は、スイッチング液晶パネル３０とタッチパネル５０に共通に用いられる電極であって、以下の説明では、共通電極３４と呼ぶ場合もある。 The first switching liquid crystal panel electrode 34 also constitutes a part of a transparent electrode of the touch panel 50 described later. That is, the first switching liquid crystal panel electrode 34 is an electrode commonly used for the switching liquid crystal panel 30 and the touch panel 50, and may be referred to as a common electrode 34 in the following description.
　一方、液晶表示パネル２０側であって、ガラス基板３１に設けられる第２スイッチング液晶パネル用電極３５は、図３に示すように、Ｘ軸方向に沿って延びる形状をなしている。具体的には、第２スイッチング液晶パネル用電極３５は、櫛形状をなす一対の電極３５Ａ、３５ＢがＸ軸方向に配列されてなる。一対の電極３５Ａ、３５Ｂは、一方の電極３５Ａの延設部３５Ａ１（Ｘ軸方向に延びる形状）間に他方の電極３５Ｂの延設部３５Ｂ１（Ｘ軸方向に延びる形状）が配される形で形成されている。なお、図３では一対の電極３５Ａ、３５Ｂの一部だけを図示している。 On the other hand, on the liquid crystal display panel 20 side, the second switching liquid crystal panel electrode 35 provided on the glass substrate 31 has a shape extending along the X-axis direction as shown in FIG. Specifically, the second switching liquid crystal panel electrode 35 includes a pair of comb-shaped electrodes 35A and 35B arranged in the X-axis direction. In the pair of electrodes 35A and 35B, an extending portion 35B1 (shape extending in the X-axis direction) of the other electrode 35B is disposed between the extending portions 35A1 (shape extending in the X-axis direction) of one electrode 35A. Is formed. In FIG. 3, only a part of the pair of electrodes 35A and 35B is shown.
　第１スイッチング液晶パネル用電極３４を構成する一対の電極３４Ａ、３４Ｂのうちの一方、例えば電極３４Ａに、視差バリア駆動信号であるスイッチング液晶駆動信号ＳＷ（この場合、正負対称の矩形波）、を印加し、電極３４Ｂおよび第２スイッチング液晶パネル用電極３５Ａ、３５Ｂを接地すると、スイッチング液晶パネル３０は、電極３４Ａの延設部３４Ａ１に対応する箇所においてのみ、光（バックライト装置１１から液晶表示パネル２０を経由した光）を遮断する、いわゆるノーマリーホワイトの構成となっている。これにより、例えば液晶表示パネル２０のうち、特定の画素群の表示を右目に、他の画素群の表示を左目において視認することが可能となり、つまりスイッチング液晶パネル３０をランドスケープ（横置）用視差バリアとして機能させることができ、３次元表示が可能となる。 A switching liquid crystal drive signal SW (in this case, a positive and negative symmetrical rectangular wave), which is a parallax barrier drive signal, is applied to one of the pair of electrodes 34A and 34B constituting the first switching liquid crystal panel electrode 34, for example, the electrode 34A. When the electrode 34B and the second switching liquid crystal panel electrodes 35A and 35B are grounded, the switching liquid crystal panel 30 emits light (from the backlight device 11 to the liquid crystal display panel only at a location corresponding to the extending portion 34A1 of the electrode 34A. 20), so-called normally white. Thus, for example, in the liquid crystal display panel 20, it is possible to visually recognize the display of a specific pixel group with the right eye and the display of the other pixel group with the left eye, that is, the switching liquid crystal panel 30 can be viewed with landscape (horizontal) parallax. It can function as a barrier, and three-dimensional display is possible.
　一方、第２スイッチング液晶パネル用透明電極３５を構成する一対の電極３５Ａ、３５Ｂの一方、例えば電極３５Ａにスイッチング液晶駆動信号ＳＷ（この場合、正負対称の矩形波）を印加し、電極３５Ｂおよび第１スイッチング液晶パネル用電極３４Ａ、３４Ｂを接地すると、スイッチング液晶パネル３０は、電極３５Ａの延設部３５Ａ１に対応する箇所（光透過部）においてのみ、光（バックライト装置１１から液晶表示パネル２０を経由した光）を遮断する構成となっている。これにより、液晶表示パネル２０のうち、特定の画素群の表示を右目に、他の画素群の表示を左目において視認することが可能となり、つまりスイッチング液晶パネル３０をポートレイト（縦置）用視差バリアとして機能させることができ、３次元表示が可能となる。 On the other hand, a switching liquid crystal drive signal SW (in this case, a positive and negative symmetric rectangular wave) is applied to one of the pair of electrodes 35A and 35B constituting the transparent electrode 35 for the second switching liquid crystal panel, for example, the electrode 35A. When the switching liquid crystal panel electrodes 34A and 34B are grounded, the switching liquid crystal panel 30 transmits light (the liquid crystal display panel 20 from the backlight device 11 to the light transmitting portion) only at a position (light transmission portion) corresponding to the extending portion 35A1 of the electrode 35A. It is configured to block light that passes through. Accordingly, it is possible to visually recognize the display of a specific pixel group in the liquid crystal display panel 20 and the display of other pixel groups in the left eye. That is, the switching liquid crystal panel 30 can be displayed as a portrait (vertical) parallax. It can function as a barrier, and three-dimensional display is possible.
　このように本実施形態においては、延びる方向の異なる２種類のスイッチング液晶パネル用電極３４、３５を備えることで、液晶表示装置１０の長辺方向と短辺方向の視差バリアを形成することができ、画面縦置き、画面横置きの２つの状態において、それぞれ３次元表示をすることが可能となっている。 As described above, in the present embodiment, by providing two types of switching liquid crystal panel electrodes 34 and 35 having different extending directions, a parallax barrier in the long side direction and the short side direction of the liquid crystal display device 10 can be formed. 3D display can be performed in two states, vertical screen and horizontal screen.
　なお、液晶表示パネル２０には、右目用画素と左目用画素がそれぞれ表示可能とされ、スイッチング液晶パネル３０に形成された光透過部を介して、液晶表示装置１０の使用者の右目で右目用画素を、左目で左目用画素を観察可能とする構成となっている。また、第１スイッチング液晶パネル用電極３４および第２スイッチング液晶パネル用電極３５に所定の交流電圧を印加しないことで、スイッチング液晶パネル３０のほぼ全面が光透過部となり、２次元表示を行うことが可能である。 Note that the right-eye pixel and the left-eye pixel can be displayed on the liquid crystal display panel 20, respectively, and the right eye for the right eye of the user of the liquid crystal display device 10 through the light transmission portion formed on the switching liquid crystal panel 30. The pixel is configured such that the left eye pixel can be observed with the left eye. Further, by not applying a predetermined AC voltage to the first switching liquid crystal panel electrode 34 and the second switching liquid crystal panel electrode 35, almost the entire surface of the switching liquid crystal panel 30 becomes a light transmitting portion, and two-dimensional display can be performed. Is possible.
　なお、交流電圧としては、±５Ｖ程度の正負対称の矩形波を使用する方法と、０／５Ｖ程度で互いに逆相となる単極性の矩形波を生成する方法とがある。本実施形態では、好ましくは、０／５Ｖ程度で互いに逆相となる単極性の矩形波を生成する方法が採用される。この方法において、スイッチング液晶層を挟む両側の電極３４，３５に同相の交流電圧を印加した場合は、液晶層には電圧が印加されず、逆相の電圧が印加された場合は液晶層に交流電圧が印加されその透過率が変化する。 In addition, as an AC voltage, there are a method of using a positive and negative symmetrical rectangular wave of about ± 5 V and a method of generating unipolar rectangular waves having opposite phases at about 0/5 V. In this embodiment, it is preferable to employ a method of generating unipolar rectangular waves having opposite phases at about 0 / 5V. In this method, when an in-phase AC voltage is applied to the electrodes 34 and 35 on both sides of the switching liquid crystal layer, no voltage is applied to the liquid crystal layer, and when a reverse-phase voltage is applied, an AC voltage is applied to the liquid crystal layer. A voltage is applied and its transmittance changes.
　また、タッチパネル５０は、共用基板３２の上下両面に形成され、透明電極であるタッチパネル用電極５１，５２を含む。具体的には、例えば、共用基板３２の下面に形成され、Ｙ軸方向に沿って延びる共通電極３４が第１タッチパネル用電極５１として利用される。一方、図４に示されるように、第２タッチパネル用電極５２は、共用基板３２の上面に形成され、Ｘ軸方向（第１タッチパネル用電極５１と交差する方向）に沿って延びる。 The touch panel 50 is formed on both upper and lower surfaces of the common substrate 32 and includes touch panel electrodes 51 and 52 which are transparent electrodes. Specifically, for example, the common electrode 34 formed on the lower surface of the shared substrate 32 and extending along the Y-axis direction is used as the first touch panel electrode 51. On the other hand, as shown in FIG. 4, the second touch panel electrode 52 is formed on the upper surface of the common substrate 32 and extends along the X-axis direction (a direction intersecting the first touch panel electrode 51).
　タッチパネル５０は、指等でその表面を指し示すことで生じる第１タッチパネル用電極５１（共通電極３４）と第２タッチパネル用透明電極５２との間の静電容量の変化によって、データ（例えば、タッチパネル５０上における座標データ）の入力等を行う構成となっている。なお、本実施形態におけるタッチパネル５０は、例えば、相互容量検出方式（Mutual capacitance Sensing）のものである。すなわち、第１タッチパネル用電極３４Ａに所定数のパルスからなるタッチパネル駆動信号Ｔｘｎを順次走査印加している最中に、ユーザの指がタッチパネル５０に触れると、検出回路ループ内の静電容量が変化する。その静電容量の変化が、第１タッチパネル用電極３４Ａと、第２タッチパネル用透明電極５２との、どのクロス点によって生じたかが、例えば、第２タッチパネル用透明電極５２を介して流れる電流波形と、タッチパネル駆動信号Ｔｘｎの印加タイミングとから特定される。 The touch panel 50 has data (for example, the touch panel 50) by a change in capacitance between the first touch panel electrode 51 (common electrode 34) and the second touch panel transparent electrode 52 generated by pointing the surface of the touch panel 50 with a finger or the like. The coordinate data (above) is input. In addition, the touch panel 50 in this embodiment is of a mutual capacitance detection method (Mutual capacitance Sensing), for example. That is, when the user's finger touches the touch panel 50 while sequentially applying the touch panel drive signal Txn having a predetermined number of pulses to the first touch panel electrode 34A, the capacitance in the detection circuit loop changes. To do. The cross-point between the first touch panel electrode 34A and the second touch panel transparent electrode 52 that causes the change in capacitance is, for example, a current waveform flowing through the second touch panel transparent electrode 52, and It is specified from the application timing of the touch panel drive signal Txn.
　このように、本実施形態においては、タッチパネル５０とスイッチング液晶パネル３０において、共用基板３２が共有される。また、タッチパネル５０とスイッチング液晶パネル３０とが共にＹ軸方向に延びる透明電極を必要とする点に着目し、両パネル３０，５０におけるＹ軸方向に延びる透明電極（３４Ａまたは３４Ｂ）が共通の電極（共通電極）として共有される。 Thus, in the present embodiment, the shared substrate 32 is shared by the touch panel 50 and the switching liquid crystal panel 30. Further, paying attention to the point that the touch panel 50 and the switching liquid crystal panel 30 both require a transparent electrode extending in the Y-axis direction, the transparent electrode (34A or 34B) extending in the Y-axis direction in both the panels 30, 50 is a common electrode. Shared as (common electrode).
　２．共通電極信号（重ね合せ信号）の生成に係る電気的構成
　次に、図５～図８を参照して、共通電極３４に供給される共通電極信号（重ね合せ信号の一例）ＳＣｎの生成に係る電気的構成を説明する。 2. Electrical Configuration for Generating Common Electrode Signal (Overlapping Signal) Next, referring to FIGS. 5 to 8, the common electrode signal (an example of the overlapping signal) supplied to the common electrode 34 is related to the generation of SCn. The electrical configuration will be described.
　液晶表示装置１０は、図５に示されるように、駆動回路（表示装置の駆動回路の一例）８０を含む。駆動回路８０は、共通電極信号ＳＣｎ（ここでは、ｎ＝１～１６の整数）の生成回路として、タッチパネルコントローラ（タッチパネル制御回路の一例）６０、重ね合せ回路７０およびスイッチング液晶駆動信号生成回路（以下、「ＳＷ信号生成回路」と記す）８１を含む。なお、駆動回路８０は、さらに、液晶表示パネル２０を駆動する表示パネル駆動部（図示せず）、バックライト装置１１を駆動するバックライト駆動部（図示せず）等を含む。 As shown in FIG. 5, the liquid crystal display device 10 includes a drive circuit (an example of a display device drive circuit) 80. The drive circuit 80 includes a touch panel controller (an example of a touch panel control circuit) 60, an overlay circuit 70, and a switching liquid crystal drive signal generation circuit (hereinafter referred to as a generation circuit) for generating a common electrode signal SCn (here, an integer of n = 1 to 16). , “SW signal generation circuit”) 81. The drive circuit 80 further includes a display panel drive unit (not shown) that drives the liquid crystal display panel 20, a backlight drive unit (not shown) that drives the backlight device 11, and the like.
　最初に、図６を参照して、本実施形態における駆動回路８０による駆動の概要を説明する。図６は、共用基板３２の各配線３４，３５に印加される信号のタイムチャートの一例を示す。なお、図６には液晶駆動信号ＳＷの０Ｖである期間Ｔ１（時刻ｔ１～ｔ２）と、５Ｖである期間Ｔ２（時刻ｔ２～ｔ３）が等しい、すなわち、液晶駆動信号ＳＷのデューティ比が５０％である場合が示されている。また、本実施形態においては、例えば、１６個の共通電極３４Ａが共用基板３２上に設けられているため、各共通電極３４Ａに対応した１６個の共通電極信号（ＳＣ１～ＳＣ１６）が生成される。 First, an outline of driving by the driving circuit 80 in this embodiment will be described with reference to FIG. FIG. 6 shows an example of a time chart of signals applied to the wirings 34 and 35 of the common substrate 32. In FIG. 6, the period T1 (time t1 to t2) where the liquid crystal drive signal SW is 0V is equal to the period T2 (time t2 to t3) which is 5V, that is, the duty ratio of the liquid crystal drive signal SW is 50%. The case is shown. In the present embodiment, for example, since 16 common electrodes 34A are provided on the common substrate 32, 16 common electrode signals (SC1 to SC16) corresponding to the respective common electrodes 34A are generated. .
　そして、本実施形態においては、スイッチング液晶駆動信号（以下単に「液晶駆動信号」と記す）ＳＷの一部をタッチパネル駆動信号Ｔｘｎに切替えて生成された共通電極信号ＳＣｎが、共用基板３２の下面に設けられた複数の電極３４Ａ，３４Ｂの一部に、具体的には、複数の電極３４Ａに印加される。その際、各共通電極信号ＳＣｎにおけるタッチパネル駆動信号Ｔｘｎの期間は異なる。すなわち、タッチパネル駆動信号Ｔｘｎは順次、電極３４Ａに印加されることになる。なお、本実施形態においては、複数（ここでは１６個）の電極３４Ａのうち、全ての電極３４Ａを共通電極３４Ａとして使用する例を示すが、これに限られない。タッチパネル５０の必要スイッチ数に応じて、複数の電極３４Ａの一部を共通電極３４Ａとして使用するようにしてもよい。例えば、１６個の電極３４Ａうち８個の電極３４Ａを共通電極３４Ａとして使用し、他の８個の電極３４Ａを液晶駆動信号ＳＷのみの電極として使用するようにしてもよい。 In the present embodiment, the common electrode signal SCn generated by switching a part of the switching liquid crystal drive signal (hereinafter simply referred to as “liquid crystal drive signal”) SW to the touch panel drive signal Txn is generated on the lower surface of the common substrate 32. Specifically, a part of the plurality of electrodes 34A and 34B is applied to the plurality of electrodes 34A. At that time, the period of the touch panel drive signal Txn in each common electrode signal SCn is different. That is, the touch panel drive signal Txn is sequentially applied to the electrode 34A. In the present embodiment, an example in which all the electrodes 34A among a plurality (16 in this case) of electrodes 34A are used as the common electrode 34A is shown, but the present invention is not limited to this. Depending on the required number of switches of the touch panel 50, a part of the plurality of electrodes 34A may be used as the common electrode 34A. For example, eight of the 16 electrodes 34A may be used as the common electrode 34A, and the other eight electrodes 34A may be used as electrodes for the liquid crystal drive signal SW only.
　図６に示されるように、ランドスケープモード（横置）の場合、各共通電極３４Ａに共通電極信号ＳＣｎ（ＳＣ１～ＳＣ１６）が印加され、電極３４Ｂには、共通電極信号ＳＣｎに含まれる液晶駆動信号ＳＷとは同一振幅で逆相の矩形波である液晶駆動信号ＳＷ（以下、単に「逆相液晶駆動信号ＳＷ－Ｒ」と記す）が印加される。この場合、液晶駆動信号ＳＷは、例えば、周波数６０Ｈｚで、電圧５Ｖの矩形波である。また、電極３５Ａ，３５Ｂには、電極３４Ａと同様の液晶駆動信号ＳＷが印加される。図６の場合、電極３４Ｂによって視差バリアが形成される。 As shown in FIG. 6, in the landscape mode (horizontal), the common electrode signal SCn (SC1 to SC16) is applied to each common electrode 34A, and the liquid crystal drive signal included in the common electrode signal SCn is applied to the electrode 34B. A liquid crystal drive signal SW (hereinafter simply referred to as “reverse phase liquid crystal drive signal SW-R”), which is a rectangular wave with the same amplitude and opposite phase as SW, is applied. In this case, the liquid crystal drive signal SW is, for example, a rectangular wave having a frequency of 60 Hz and a voltage of 5V. Further, the same liquid crystal drive signal SW as that of the electrode 34A is applied to the electrodes 35A and 35B. In the case of FIG. 6, a parallax barrier is formed by the electrode 34B.
　一方、ポートレイトモード（縦置）の場合、共通電極３４Ａに共通電極信号ＳＣｎが印加され、電極３５Ｂに逆相液晶駆動信号ＳＷ－Ｒが印加される。また、電極３４Ｂ，３５Ａには、電極３４Ａと同様の液晶駆動信号ＳＷが印加される。図６の場合、電極３５Ｂによって視差バリアが形成される。 On the other hand, in the portrait mode (vertical position), the common electrode signal SCn is applied to the common electrode 34A, and the reverse phase liquid crystal drive signal SW-R is applied to the electrode 35B. Further, the same liquid crystal drive signal SW as that of the electrode 34A is applied to the electrodes 34B and 35A. In the case of FIG. 6, a parallax barrier is formed by the electrode 35B.
　２－１．タッチパネルコントローラの構成
　タッチパネルコントローラ６０は、例えば、ＡＳＩＣ（特定用途向けＩＣ）によって構成され、図５に示されるように、切替え信号生成回路６１、タッチパネル駆動信号生成回路６２、同期信号生成回路６３、および停止信号生成回路９０等を含む。 2-1. Configuration of Touch Panel Controller The touch panel controller 60 is configured by, for example, an ASIC (application-specific IC), and as illustrated in FIG. 5, a switching signal generation circuit 61, a touch panel drive signal generation circuit 62, a synchronization signal generation circuit 63, and A stop signal generation circuit 90 and the like are included.
　切替え信号生成回路６１は、スイッチング液晶パネル３０を駆動するスイッチング液晶駆動信号ＳＷを、タッチパネル駆動信号Ｔｘｎと切替えて共用基板３２に供給するための切替え期間を指定する切替え信号ＳＥＬを、タッチパネル駆動信号Ｔｘｎの生成タイミングに対応して生成する。切替え信号ＳＥＬは、本実施形態では、図８に示されるように、所定周期のパルス信号であり、タッチパネル信号周期あたり、１６個のパルスを含む。なお、切替え信号生成回路６１は、タッチパネルコントローラ６０の外部に設けられてもよい。 The switching signal generation circuit 61 switches the switching liquid crystal driving signal SW for driving the switching liquid crystal panel 30 to the touch panel driving signal Txn and designates a switching signal SEL for specifying a switching period for supplying the common substrate 32 to the touch panel driving signal Txn. It is generated corresponding to the generation timing. In the present embodiment, the switching signal SEL is a pulse signal having a predetermined cycle as shown in FIG. 8 and includes 16 pulses per touch panel signal cycle. Note that the switching signal generation circuit 61 may be provided outside the touch panel controller 60.
　タッチパネル駆動信号生成回路６２は、タッチパネル５０を駆動するタッチパネル駆動信号Ｔｘｎ（ここでは、ｎ＝１～１６の整数）を生成する。各タッチパネル駆動信号Ｔｘｎは、図８に示されるように、各切替え信号ＳＥＬに対応した信号であり、所定期間（パルス生成期間）Ｋ１における所定数のパルスからなる。なお、図８には各タッチパネル駆動信号Ｔｘｎが分離されて示されるが、タッチパネル駆動信号生成回路６２は、タッチパネル駆動信号Ｔｘｎを、切替え信号ＳＥＬと同期させて所定間隔で連続して生成する。各タッチパネル駆動信号Ｔｘｎは、各パルス生成期間Ｋ１に対応して重ね合せ回路７０に送出される。 The touch panel drive signal generation circuit 62 generates a touch panel drive signal Txn for driving the touch panel 50 (here, n = 1 to 16). As shown in FIG. 8, each touch panel drive signal Txn is a signal corresponding to each switching signal SEL, and includes a predetermined number of pulses in a predetermined period (pulse generation period) K1. In FIG. 8, each touch panel drive signal Txn is shown separately, but the touch panel drive signal generation circuit 62 continuously generates the touch panel drive signal Txn at a predetermined interval in synchronization with the switching signal SEL. Each touch panel drive signal Txn is sent to the overlay circuit 70 corresponding to each pulse generation period K1.
　同期信号生成回路６３は、液晶駆動信号ＳＷをタッチパネル駆動信号Ｔｘｎに切替える動作を、所定周期で開始させる同期信号ＳＹＮを生成する。切替え信号ＳＥＬ、タッチパネル駆動信号Ｔｘｎおよび同期信号ＳＹＮは、重ね合せ回路７０に供給される。 The synchronization signal generation circuit 63 generates a synchronization signal SYN that starts an operation of switching the liquid crystal drive signal SW to the touch panel drive signal Txn at a predetermined cycle. The switching signal SEL, the touch panel drive signal Txn, and the synchronization signal SYN are supplied to the overlay circuit 70.
　２－１－１．停止信号生成回路の構成
　次に、図７を参照して、停止信号生成回路を説明する。図７は停止信号生成回路９０の構成を概略的に示すブロック図である。停止信号生成回路９０は、図７に示されるように、エッジ検出回路９１、カウンタ９２、バッファ回路９３、レジスタ９４、減算器９５、一致検出回路９６、およびフリップフロップ回路９７を含む。 2-1-1. Configuration of Stop Signal Generation Circuit Next, the stop signal generation circuit will be described with reference to FIG. FIG. 7 is a block diagram schematically showing the configuration of the stop signal generation circuit 90. The stop signal generation circuit 90 includes an edge detection circuit 91, a counter 92, a buffer circuit 93, a register 94, a subtractor 95, a coincidence detection circuit 96, and a flip-flop circuit 97, as shown in FIG.
　エッジ検出回路９１は、ＳＷ信号生成回路８１から液晶駆動信号ＳＷを受け取り、液晶駆動信号ＳＷのエッジを検出する。例えば、エッジ検出回路９１は、図６における時刻ｔ１において液晶駆動信号ＳＷの立ち下がりエッジを検出するとエッジ検出信号Ｅｄを生成しエッジ検出信号Ｅｄをカウンタ９２およびバッファ回路９３に供給する。カウンタ９２はエッジ検出信号Ｅｄに基づいてカウントを開始する。カウンタ９２は所定のクロック信号Ｃｌｋをカウントして、所定時間を計測する。 The edge detection circuit 91 receives the liquid crystal drive signal SW from the SW signal generation circuit 81 and detects the edge of the liquid crystal drive signal SW. For example, when the falling edge of the liquid crystal drive signal SW is detected at time t 1 in FIG. 6, the edge detection circuit 91 generates the edge detection signal Ed and supplies the edge detection signal Ed to the counter 92 and the buffer circuit 93. The counter 92 starts counting based on the edge detection signal Ed. The counter 92 counts a predetermined clock signal Clk and measures a predetermined time.
　カウンタ９２のカウント値ＣＮはバッファ回路９３に供給される。そして、図６における時刻ｔ２における液晶駆動信号ＳＷの立ち上がりエッジに対応したエッジ検出信号Ｅｄに基づいて、エッジ検出回路９１は、カウンタ９２のカウント値ＣＮをクリアする。また、時刻ｔ２において、バッファ回路９３は、エッジ検出信号Ｅｄに基づいて、カウンタ９２のクリア前のカウント値ＣＴを記憶する。 The count value CN of the counter 92 is supplied to the buffer circuit 93. Then, the edge detection circuit 91 clears the count value CN of the counter 92 based on the edge detection signal Ed corresponding to the rising edge of the liquid crystal drive signal SW at time t2 in FIG. At time t2, the buffer circuit 93 stores the count value CT before the counter 92 is cleared based on the edge detection signal Ed.
　クリア前のカウント値ＣＴは、液晶駆動信号ＳＷのエッジ間（時刻ｔ１～ｔ２）、すなわち液晶駆動信号ＳＷの半周期（「切替わり間隔」に相当する）Ｔ１の時間情報であり、液晶駆動信号ＳＷの他の半周期Ｔ２（時刻ｔ２～ｔ３）の時間情報と等しい。そのため、時刻ｔ２からカウンタ９２のカウント値ＣＮがバッファ回路９３に記憶されたカウント値ＣＴに近づくことは、液晶駆動信号ＳＷの次のエッジ時刻ｔ３が近づいていることを示すこととなる。すなわち、カウンタ９２の現在のカウント値ＣＮと格納カウント値ＣＴとを比較することで、液晶駆動信号ＳＷのエッジ時刻を予測することができる。それによって、液晶駆動信号ＳＷのエッジとタッチパネル駆動信号Ｔｘｎとの重なり合いを回避して、重なり合いによるノイズの発生を回避できる。 The count value CT before clearing is the time information of the liquid crystal drive signal SW between edges (time t1 to t2), that is, the half period (corresponding to “switching interval”) T1 of the liquid crystal drive signal SW. It is equal to the time information of the other half cycle T2 (time t2 to t3) of SW. Therefore, when the count value CN of the counter 92 approaches the count value CT stored in the buffer circuit 93 from time t2, it indicates that the next edge time t3 of the liquid crystal drive signal SW is approaching. That is, the edge time of the liquid crystal drive signal SW can be predicted by comparing the current count value CN of the counter 92 with the stored count value CT. Thereby, the overlap of the edge of the liquid crystal drive signal SW and the touch panel drive signal Txn can be avoided, and the generation of noise due to the overlap can be avoided.
　なお、タッチパネル駆動信号Ｔｘｎは、上記したように、通常、図８に示されるように、所定のパルス生成期間Ｋ１、連続した複数のパルスによって構成され、パルスの途中でタッチパネル駆動信号Ｔｘｎの生成を停止することができない。そのため、タッチパネル駆動信号Ｔｘｎのパルス生成期間Ｋ１を見込んで液晶駆動信号ＳＷのエッジタイミングが接近していることを検出しなければならない。すなわち、例えば、図６および図８の時刻ｔ３で液晶駆動信号ＳＷのエッジが発生する場合、時刻ｔ３よりパルス生成期間Ｋ１以前に新たなタッチパネル駆動信号Ｔｘｎの生成を停止させなければならない。 As described above, the touch panel drive signal Txn is usually composed of a predetermined pulse generation period K1 and a plurality of continuous pulses as shown in FIG. 8, and the touch panel drive signal Txn is generated in the middle of the pulse. I can't stop. Therefore, it is necessary to detect that the edge timing of the liquid crystal drive signal SW is approaching in anticipation of the pulse generation period K1 of the touch panel drive signal Txn. That is, for example, when an edge of the liquid crystal drive signal SW occurs at time t3 in FIGS. 6 and 8, generation of a new touch panel drive signal Txn must be stopped before the pulse generation period K1 from time t3.
　そのため、本実施形態では、バッファ回路９３に格納されたカウント値ＣＴに対してパルス生成期間Ｋ１に対応する補正が行われる。その補正期間である補正値Ｋｈがレジスタ９４に設定されている。その補正値Ｋｈが減算器９５に提供され、減算器９５は、カウント値ＣＴから補正値Ｋｈに相当するカウント値を減算して補正カウント値Ｃｈを生成し、補正カウント値Ｃｈを一致検出回路９６に供給する。 Therefore, in the present embodiment, correction corresponding to the pulse generation period K1 is performed on the count value CT stored in the buffer circuit 93. A correction value Kh that is the correction period is set in the register 94. The correction value Kh is provided to the subtractor 95. The subtractor 95 generates a correction count value Ch by subtracting a count value corresponding to the correction value Kh from the count value CT, and uses the correction count value Ch as the coincidence detection circuit 96. To supply.
　一致検出回路９６は、カウンタ９２からの現在のカウント値ＣＮと補正カウント値Ｃｈとを比較する。そして、一致検出回路９６は、現在のカウント値ＣＮが補正カウント値Ｃｈに達した場合、フリップフロップ回路９７に停止信号ＳＴを生成開始するためのトリガ信号Ｓｔｇを生成し、トリガ信号Ｓｔｇをフリップフロップ回路９７に供給する。この時刻は、図８の時刻（ｔ２－１）に相当する。 The coincidence detection circuit 96 compares the current count value CN from the counter 92 with the correction count value Ch. When the current count value CN reaches the correction count value Ch, the coincidence detection circuit 96 generates a trigger signal Stg for starting generation of the stop signal ST in the flip-flop circuit 97, and the trigger signal Stg is flip-flops. Supply to circuit 97. This time corresponds to the time (t2-1) in FIG.
　フリップフロップ回路９７は、トリガ信号Ｓｔｇに応じて、タッチパネル駆動信号Ｔｘｎの生成を所定の停止時間Ｋ２、停止させる停止信号ＳＴを生成し、停止信号ＳＴを切替え信号生成回路６１およびタッチパネル駆動信号生成回路６２に供給する。なお、停止期間Ｋ２は、図８の時刻（ｔ２－１）から液晶駆動信号ＳＷのエッジタイミング時刻ｔ３までの期間であり、パルス生成期間Ｋ１より長い期間とされる。すなわち、パルス生成期間Ｋ１と停止期間Ｋ２とには、Ｋ１＜Ｋ２の関係がある。なお、カウント補正値Ｋｈに相当する期間は、停止期間Ｋ２に相当する。 In response to the trigger signal Stg, the flip-flop circuit 97 generates a stop signal ST for stopping the generation of the touch panel drive signal Txn for a predetermined stop time K2, and the stop signal ST is switched to the switching signal generation circuit 61 and the touch panel drive signal generation circuit. 62. The stop period K2 is a period from the time (t2-1) in FIG. 8 to the edge timing time t3 of the liquid crystal drive signal SW, and is longer than the pulse generation period K1. In other words, the pulse generation period K1 and the stop period K2 have a relationship of K1 <K2. Note that the period corresponding to the count correction value Kh corresponds to the stop period K2.
　切替え信号生成回路６１は、停止信号ＳＴを受け取ると、図８に示されるように、停止期間Ｋ２の間において、新たに、切替え信号ＳＥＬをローレベル（Ｌ）からハイレベル（Ｈ）に立ち上げることを停止する。すなわち、停止期間Ｋ２において新たに、タッチパネル駆動信号Ｔｘｎが共通電極３４に出力されることを禁止する。液晶駆動信号ＳＷのエッジタイミング時刻ｔ３から所定時間の過ぎた、図８の時刻ｔ４に切替え信号ＳＥＬをＨレベルとする。
　なお、切替え信号ＳＥＬとタッチパネル駆動信号Ｔｘｎとは同期しており、タッチパネル駆動信号Ｔｘｎが出力される期間（パルス生成期間）Ｋ１において切替え信号ＳＥＬが出力されている必要がある。すなわち、パルス生成期間Ｋ１切替え信号ＳＥＬのＨレベル期間は、パルス生成期間Ｋ１に対応した期間である。 When receiving the stop signal ST, the switching signal generation circuit 61 newly raises the switching signal SEL from the low level (L) to the high level (H) during the stop period K2, as shown in FIG. Stop that. That is, the touch panel drive signal Txn is newly prohibited from being output to the common electrode 34 in the stop period K2. The switching signal SEL is set to the H level at time t4 in FIG. 8 after a predetermined time has elapsed from the edge timing time t3 of the liquid crystal drive signal SW.
Note that the switching signal SEL and the touch panel driving signal Txn are synchronized, and the switching signal SEL needs to be output during the period (pulse generation period) K1 during which the touch panel driving signal Txn is output. That is, the H level period of the pulse generation period K1 switching signal SEL is a period corresponding to the pulse generation period K1.
　また、タッチパネル駆動信号生成回路６２は、停止信号ＳＴを受け取ると、図８に示されるように、停止期間Ｋ２の間、タッチパネル駆動信号Ｔｘ（ｎ＋３）の生成を停止し、図８の時刻ｔ４からタッチパネル駆動信号Ｔｘ（ｎ＋３）の生成を開始する。そして、時刻ｔ４以後において、タッチパネル駆動信号Ｔｘ（ｎ＋３）が共通電極３４に出力される。そのため、液晶駆動信号ＳＷのエッジタイミング時刻ｔ３とタッチパネル駆動信号Ｔｘ（ｎ＋３）の出力期間が重なることが回避される。 When the touch panel drive signal generation circuit 62 receives the stop signal ST, as shown in FIG. 8, the touch panel drive signal generation circuit 62 stops generating the touch panel drive signal Tx (n + 3) during the stop period K2, and from time t4 in FIG. Generation of the touch panel drive signal Tx (n + 3) is started. Then, after time t4, the touch panel drive signal Tx (n + 3) is output to the common electrode 34. Therefore, it is avoided that the edge timing time t3 of the liquid crystal drive signal SW overlaps with the output period of the touch panel drive signal Tx (n + 3).
　２－２．その他の構成
　ＳＷ信号生成回路８１は液晶駆動信号ＳＷを生成し、液晶駆動信号ＳＷを重ね合せ回路７０に供給する。
　また、重ね合せ回路７０は、図８に示されるように、切替え信号ＳＥＬに応じて、液晶駆動信号ＳＷをタッチパネル駆動信号Ｔｘｎ（Ｔｘ１～Ｔｘ１６）に切替えて重ね合せ信号ＳＣｎ（ＳＣ１～ＳＣ１６）を生成し、重ね合せ信号ＳＣｎを共用基板３２に供給する。詳しくは、重ね合せ回路７０は、各重ね合せ信号（ＳＣ１～ＳＣ１６）を対応した共用基板３２の各共通電極３４Ａに、順次走査して時分割で供給する。重ね合せ回路７０は、例えば、切替え信号ＳＥＬをシフトさせるシフトレジスタ、およびタッチパネル駆動信号Ｔｘｎと液晶駆動信号ＳＷとのいずれかを選択するデータ選択回路等を含む。 2-2. Other Configurations The SW signal generation circuit 81 generates a liquid crystal drive signal SW and supplies the liquid crystal drive signal SW to the overlay circuit 70.
Further, as shown in FIG. 8, the overlay circuit 70 switches the liquid crystal drive signal SW to the touch panel drive signal Txn (Tx1 to Tx16) in response to the switching signal SEL, and outputs the overlay signal SCn (SC1 to SC16). Then, the overlapping signal SCn is generated and supplied to the common substrate 32. Specifically, the overlay circuit 70 sequentially scans and supplies each overlay signal (SC1 to SC16) to each common electrode 34A of the corresponding common substrate 32 in a time-sharing manner. The overlay circuit 70 includes, for example, a shift register that shifts the switching signal SEL and a data selection circuit that selects either the touch panel drive signal Txn or the liquid crystal drive signal SW.
　３．実施形態の効果
　液晶駆動信号ＳＷの信号レベルの切替わりタイミング（図８の時刻ｔ３参照）に対応してタッチパネル駆動信号Ｔｘｎの生成が所定停止期間Ｋ２、停止される。そのため、液晶駆動信号ＳＷとタッチパネル駆動信号Ｔｘｎとを重ね合せた重ね合せ信号ＳＣｎを共用基板３２上の電極３４に供給する場合においても、液晶駆動信号ＳＷの信号レベルの切替わりタイミングに重ね合せ信号ＳＣｎが生成されることが回避される。その結果、同期しないタッチパネル駆動信号Ｔｘｎと液晶駆動信号ＳＷとによって重ね合せ信号ＳＣｎを生成する際に、ノイズを発生させることを抑制することができる。 3. Effect of Embodiment The generation of the touch panel drive signal Txn is stopped for a predetermined stop period K2 in response to the switching timing of the signal level of the liquid crystal drive signal SW (see time t3 in FIG. 8). Therefore, even when the overlay signal SCn obtained by superimposing the liquid crystal drive signal SW and the touch panel drive signal Txn is supplied to the electrode 34 on the common substrate 32, the overlay signal is switched at the switching timing of the signal level of the liquid crystal drive signal SW. Generation of SCn is avoided. As a result, it is possible to suppress the generation of noise when the overlay signal SCn is generated by the touch panel drive signal Txn and the liquid crystal drive signal SW that are not synchronized.
　また、通常、タッチパネル駆動信号Ｔｘｎは複数のパルス信号から構成され、所定の信号生成期間Ｋ１（図８参照）を有している。そのため、液晶駆動信号ＳＷの信号レベルの切替わりタイミング以前（図８の時刻（ｔ２－１）参照）からタッチパネル駆動信号Ｔｘｎの新たな生成を停止することによって、切替わりタイミングがタッチパネル駆動信号Ｔｘｎの生成期間Ｋ１内となることを回避できる。 Further, normally, the touch panel drive signal Txn is composed of a plurality of pulse signals, and has a predetermined signal generation period K1 (see FIG. 8). Therefore, by stopping the new generation of the touch panel drive signal Txn before the switching timing of the signal level of the liquid crystal driving signal SW (see time (t2-1) in FIG. 8), the switching timing is changed to the touch panel driving signal Txn. The generation period K1 can be avoided.
　液晶駆動信号ＳＷの切替わり間隔Ｔ１，Ｔ２を短縮する補正量Ｋｈを適宜設定することによって、液晶駆動信号の切替わり間隔Ｔ１，Ｔ２、あるいはタッチパネル駆動信号Ｔｘｎの生成期間Ｋ１に対応させることができる。すなわち、単に補正量Ｋｈを設定変更するだけで、各種の液晶駆動信号ＳＷの切替わり間隔Ｔ１，Ｔ２、すなわち液晶駆動信号ＳＷの周期Ｔ１，Ｔ２、あるいは各種のタッチパネル駆動信号Ｔｘｎに対応して、切替わりタイミングがタッチパネル駆動信号Ｔｘｎの信号生成期間Ｋ１内となることを確実に回避できる。 By appropriately setting the correction amount Kh for shortening the switching intervals T1 and T2 of the liquid crystal drive signal SW, it is possible to correspond to the generation intervals K1 of the switching intervals T1 and T2 of the liquid crystal drive signal or the touch panel drive signal Txn. . That is, simply by changing the setting of the correction amount Kh, the switching intervals T1 and T2 of various liquid crystal drive signals SW, that is, the periods T1 and T2 of the liquid crystal drive signals SW, or various touch panel drive signals Txn, It can be reliably avoided that the switching timing is within the signal generation period K1 of the touch panel drive signal Txn.
　また、タッチパネル駆動信号Ｔｘｎの停止期間Ｋ２がその生成期間Ｋ１より長い期間に設定される。そのため、図８の時刻（ｔ２－１）の直前にタッチパネル駆動信号Ｔｘｎの生成が開始された場合であっても、液晶駆動信号ＳＷの切替わりタイミングがタッチパネル駆動信号Ｔｘｎの生成期間Ｋ１内となることを確実に回避できる。 Further, the stop period K2 of the touch panel drive signal Txn is set to a period longer than the generation period K1. Therefore, even when the generation of the touch panel drive signal Txn is started immediately before time (t2-1) in FIG. 8, the switching timing of the liquid crystal drive signal SW is within the generation period K1 of the touch panel drive signal Txn. This can be avoided reliably.
　また、切替え信号生成回路６１の切替え信号ＳＥＬに基づいて、液晶駆動信号ＳＷとタッチパネル駆動信号Ｔｘｎとの重ね合せ信号ＳＣｎを生成する際、液晶駆動信号ＳＷの切替わりタイミングを避けて重ね合せ信号ＳＣｎが生成される。そのため、重ね合せ信号ＳＣｎを生成する場合にあって、液晶駆動信号ＳＷの切替わりタイミングがタッチパネル駆動信号Ｔｘｎの生成期間内となることを、確実に回避できる。 Further, when generating the overlapping signal SCn of the liquid crystal driving signal SW and the touch panel driving signal Txn based on the switching signal SEL of the switching signal generating circuit 61, the overlapping signal SCn is avoided while avoiding the switching timing of the liquid crystal driving signal SW. Is generated. Therefore, when the overlay signal SCn is generated, it is possible to reliably avoid the switching timing of the liquid crystal drive signal SW being within the generation period of the touch panel drive signal Txn.
　＜他の実施形態＞
　本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
　（１）上記実施形態においては、図６に示されるように、液晶駆動信号ＳＷのデューティ比が５０％である場合が示されたが、これに限られない。すなわち、液晶駆動信号ＳＷのデューティ比が５０％でない場合（期間Ｔ１と期間Ｔ２が等しくない場合）であってもよい。この場合、図９に示すように、バッファ９３を２個設け、例えば、液晶駆動信号ＳＷの０Ｖである期間Ｔ１にはバッファ９３Ａを対応させ、液晶駆動信号ＳＷの５Ｖである期間Ｔ２にはバッファ９３Ｂを対応させる。そして、期間Ｔ１，Ｔ２に応じて、各バッファ９３Ａ，９３Ｂをトグル動作させ、各期間Ｔ１，期間Ｔ２に応じてカウント補正値Ｋｈをレジスタ９４に設定し、各期間Ｔ１，期間Ｔ２に応じて停止期間Ｋ２を設けるようにすればよい。 (1) In the above embodiment, as shown in FIG. 6, the case where the duty ratio of the liquid crystal drive signal SW is 50% is shown, but the present invention is not limited to this. That is, it may be the case where the duty ratio of the liquid crystal drive signal SW is not 50% (when the period T1 and the period T2 are not equal). In this case, as shown in FIG. 9, two buffers 93 are provided. For example, the buffer 93A is associated with the period T1 where the liquid crystal drive signal SW is 0V, and the buffer 93A is associated with the period T2 where the liquid crystal drive signal SW is 5V. 93B is made to correspond. Then, the buffers 93A and 93B are toggled according to the periods T1 and T2, the count correction value Kh is set in the register 94 according to the periods T1 and T2, and stopped according to the periods T1 and T2. A period K2 may be provided.
　（２）上記実施形態では、新たなタッチパネル駆動信号Ｔｘｎの生成を停止させる停止期間Ｋ２を、図８に示される時刻（ｔ２－１）から時刻ｔ３までの期間としたがこれに限られない。例えば、停止期間Ｋ２の終了時刻を、時刻ｔ３以後であって時刻ｔ３に近い所定時刻としてもよい。この場合、タッチパネル駆動信号Ｔｘｎの停止期間Ｋ２が切替わりタイミング以後も継続されるため、液晶駆動信号ＳＷの切替わりタイミングがタッチパネル駆動信号の生成期間内となることを、さらに確実に回避できる。 (2) In the above embodiment, the stop period K2 for stopping the generation of the new touch panel drive signal Txn is the period from time (t2-1) to time t3 shown in FIG. 8, but is not limited thereto. For example, the end time of the stop period K2 may be a predetermined time after time t3 and close to time t3. In this case, since the stop period K2 of the touch panel drive signal Txn is continued after the switching timing, it is possible to more reliably avoid the switching timing of the liquid crystal drive signal SW being within the generation period of the touch panel drive signal.
　（３）上記実施形態では、一致検出回路９６は、現在のカウント値ＣＮが補正カウント値Ｃｈに達した場合、すなわち、ＣＮ＝Ｃｈである場合、停止信号ＳＴを生成する例を示したがこれに限られない。例えば、ＣＮ＝Ｃｈ－α　で有る場合において停止信号ＳＴを生成するようにしてもよい。ここで、αは任意のカウント数である。すなわち、現在のカウント値ＣＮが補正カウント値Ｃｈに近づいた時点で停止信号ＳＴを生成するようにしてもよい。 (3) In the above embodiment, the coincidence detection circuit 96 generates the stop signal ST when the current count value CN reaches the correction count value Ch, that is, when CN = Ch. Not limited to. For example, the stop signal ST may be generated when CN = Ch−α. Here, α is an arbitrary count number. That is, the stop signal ST may be generated when the current count value CN approaches the correction count value Ch.
（４）上記実施形態では、バッファ回路９３に格納されたカウント値ＣＴを補正して補正カウント値Ｃｈを生成する際に、レジスタ９４に設定されたカウント補正値Ｋｈを使用する例を示したが、これに限られない。
　例えば、負荷等の動作環境に応じてタッチパネルコントローラ６０の動作クロック周波数が変更されるような場合、それに応じてパルス生成期間Ｋ１は変化することとなる。この場合、動作クロック周波数の変更に応じて、パルス生成期間Ｋ１に相当するカウント補正値Ｋｈを設定変更することが考えられる。
　しかしながら、このような場合、カウント補正値Ｋｈを設定変更することは面倒である。そのため、このような場合、パルス生成期間Ｋ１に対応した期間である切替え信号ＳＥＬのＨレベルの期間をカウントすることによってカウント補正値Ｋｈ（パルス生成期間Ｋ１）を決定し、決定されたカウント補正値Ｋｈによってレジスタ９４に設定されたカウント補正値Ｋｈを更新するようにしてもよい。すなわち、短縮する所定量が切替え信号ＳＥＬの長さをカウントすることによって決定されるようにしてもよい。この場合、動作クロック周波数の変更によってパルス生成期間Ｋ１が変化する場合であっても、カウント補正値Ｋｈが自動的に書き換えられる。 (4) In the above embodiment, the example in which the count correction value Kh set in the register 94 is used when generating the correction count value Ch by correcting the count value CT stored in the buffer circuit 93 has been described. Not limited to this.
For example, when the operation clock frequency of the touch panel controller 60 is changed according to the operating environment such as a load, the pulse generation period K1 changes accordingly. In this case, it is conceivable to change the setting of the count correction value Kh corresponding to the pulse generation period K1 in accordance with the change of the operation clock frequency.
However, in such a case, it is troublesome to change the setting of the count correction value Kh. Therefore, in such a case, the count correction value Kh (pulse generation period K1) is determined by counting the H level period of the switching signal SEL that is a period corresponding to the pulse generation period K1, and the determined count correction value is determined. The count correction value Kh set in the register 94 may be updated by Kh. That is, the predetermined amount to be shortened may be determined by counting the length of the switching signal SEL. In this case, the count correction value Kh is automatically rewritten even when the pulse generation period K1 changes due to the change of the operation clock frequency.
　（５）上記実施形態では、共用基板３２の下面に設けられた複数の電極３４Ａ，３４Ｂのうち、電極３４Ａを共通電極とする例を示したが、これに限られず、電極３４Ｂを共通電極として使用するようにしてもよい。 (5) In the above embodiment, the example in which the electrode 34A is the common electrode among the plurality of electrodes 34A and 34B provided on the lower surface of the common substrate 32 has been shown, but the present invention is not limited thereto, and the electrode 34B is used as the common electrode. It may be used.
　（６）上記実施形態では、表示画面を縦置きにしてみる場合（ポートレイトモード）と横置きにしてみる場合（ランドスケープモード）のどちらにも対応できるような構成としたが、これに限られない。例えば、どちらか一方の状態でのみ視差バリアを使用する場合は、ガラス基板３１上の電極３５はパターン化する必要はなく、全面ベタ電極でよい。そして、この場合、ガラス基板（共用基板）３２上に形成されるバリア用電極に印加する信号に本発明を適用できる。 (6) In the above-described embodiment, the display screen is vertically arranged (portrait mode) or horizontally (landscape mode). However, the present invention is not limited to this. Absent. For example, when the parallax barrier is used only in one of the states, the electrode 35 on the glass substrate 31 does not need to be patterned and may be a solid electrode. In this case, the present invention can be applied to a signal applied to the barrier electrode formed on the glass substrate (common substrate) 32.
　（７）上記実施形態では、表示パネルとして液晶パネルを用いた液晶表示装置を例示したが、他の種類の表示パネル、例えば、ＥＬパネルを用いた表示装置にも本発明は適用可能である。 (7) In the above embodiment, a liquid crystal display device using a liquid crystal panel as the display panel has been illustrated, but the present invention can also be applied to other types of display panels, for example, display devices using an EL panel.
１０…液晶表示装置（表示装置）、２０…液晶表示パネル（表示パネル）、３０…スイッチング液晶パネル（視差バリア）、３２…共用基板、３４Ａ…共通電極、５０…タッチパネル、６０…タッチパネルコントローラ、６１…切替え信号生成回路、６２…タッチパネル駆動信号生成回路、７０…重ね合せ回路、８０…駆動回路（表示装置の駆動回路）、８１…スイッチング液晶駆動生成回路、９０…停止信号生成回路、９１…エッジ検出回路、９２…カウンタ、９３…バッファ回路、９４…レジスタ（補正回路）、９５…減算器（補正回路）、９６…一致検出回路（比較回路）、９７…フリップフロップ回路（比較回路） DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display apparatus), 20 ... Liquid crystal display panel (display panel), 30 ... Switching liquid crystal panel (parallax barrier), 32 ... Shared substrate, 34A ... Common electrode, 50 ... Touch panel, 60 ... Touch panel controller, 61 ... Switching signal generation circuit, 62 ... Touch panel drive signal generation circuit, 70 ... Overlay circuit, 80 ... Drive circuit (drive circuit of display device), 81 ... Switching liquid crystal drive generation circuit, 90 ... Stop signal generation circuit, 91 ... Edge Detection circuit, 92 ... counter, 93 ... buffer circuit, 94 ... register (correction circuit), 95 ... subtractor (correction circuit), 96 ... coincidence detection circuit (comparison circuit), 97 ... flip-flop circuit (comparison circuit)

Claims (11)

  1. 　表示パネルと、前記表示パネルの表示面側に配されたタッチパネルと、３次元表示を可能とするスイッチング液晶パネルからなる視差バリアとを有する表示装置における前記タッチパネルを制御するタッチパネル制御回路であって、前記表示装置において、前記タッチパネルを構成する基板と、前記スイッチング液晶パネルを構成する二枚の基板の一方とが共用基板とされ、かつ複数のタッチパネル用電極とスイッチング液晶用電極が前記共用基板の同一平面上に形成されており、
    　該タッチパネル制御回路は、
    　前記タッチパネルを駆動するタッチパネル駆動信号を生成するタッチパネル駆動信号生成回路と、
    　前記スイッチング液晶パネルを駆動するスイッチング液晶駆動信号を受け取り、前記スイッチング液晶駆動信号の信号レベルの切替わりタイミングに対応して、前記タッチパネル駆動信号の新たな生成を所定停止期間において停止させる停止信号を生成し、前記タッチパネル駆動信号の生成を前記所定停止期間に停止させる停止信号生成回路と、
    　前記スイッチング液晶駆動信号を前記タッチパネル駆動信号と切替えて前記共用基板に供給するための切替え信号を、前記タッチパネル駆動信号の生成期間に対応して生成する切替え信号生成回路であって、前記停止信号に応じて、前記所定停止期間の間において、新たな前記切替え信号の生成を停止する切替え信号生成回路と、
    　を備えたタッチパネル制御回路。     A touch panel control circuit for controlling the touch panel in a display device having a display panel, a touch panel arranged on a display surface side of the display panel, and a parallax barrier including a switching liquid crystal panel capable of three-dimensional display, In the display device, a substrate constituting the touch panel and one of the two substrates constituting the switching liquid crystal panel are used as a common substrate, and a plurality of touch panel electrodes and switching liquid crystal electrodes are the same as the common substrate. Formed on a plane,
    The touch panel control circuit
    A touch panel drive signal generation circuit for generating a touch panel drive signal for driving the touch panel;
    A switching liquid crystal driving signal for driving the switching liquid crystal panel is received, and a stop signal is generated to stop the new generation of the touch panel driving signal in a predetermined stop period in response to the switching timing of the signal level of the switching liquid crystal driving signal. A stop signal generation circuit for stopping the generation of the touch panel drive signal during the predetermined stop period;
    A switching signal generation circuit for generating a switching signal for switching the switching liquid crystal driving signal to the touch panel driving signal and supplying the switching liquid crystal driving signal to the shared substrate corresponding to a generation period of the touch panel driving signal, In response, a switching signal generation circuit that stops generating the new switching signal during the predetermined stop period;
    Touch panel control circuit with
  2. 　前記停止信号生成回路は、
    　前記スイッチング液晶駆動信号の信号レベルの切替わりタイミングを検出するエッジ検出回路と、
    　前記切替わりタイミングからの経過期間を計測することによって、前記スイッチング液晶駆動信号の信号レベルの切替わり間隔期間を計測するカウンタとを含み、
    　前記経過期間が前記切替わり間隔期間に達する以前に前記タッチパネル駆動信号の生成を停止させる、請求項１に記載のタッチパネル制御回路。     The stop signal generation circuit includes:
    An edge detection circuit for detecting a switching timing of the signal level of the switching liquid crystal drive signal;
    A counter for measuring a switching interval period of a signal level of the switching liquid crystal driving signal by measuring an elapsed period from the switching timing,
    The touch panel control circuit according to claim 1, wherein generation of the touch panel drive signal is stopped before the elapsed period reaches the switching interval period.
  3. 　前記停止信号生成回路は、
    　前記カウンタによって計測された前記切替わり間隔を格納するバッファ回路と、
    　前記バッファ回路に格納された前記切替わり間隔を所定量短縮するように補正する補正回路と、
    　補正された前記切替わり間隔と前記経過期間との比較に基づいて前記停止信号を生成する比較回路とを含む、請求項２に記載のタッチパネル制御回路。     The stop signal generation circuit includes:
    A buffer circuit for storing the switching interval measured by the counter;
    A correction circuit for correcting the switching interval stored in the buffer circuit so as to reduce the switching interval by a predetermined amount;
    The touch panel control circuit according to claim 2, further comprising: a comparison circuit that generates the stop signal based on a comparison between the corrected switching interval and the elapsed period.
  4. 　前記所定量が前記切替え信号の長さをカウントすることによって決定される、請求項３に記載のタッチパネル制御回路。 4. The touch panel control circuit according to claim 3, wherein the predetermined amount is determined by counting a length of the switching signal.
  5. 　前記タッチパネル駆動信号は、同一の時間長である複数の生成期間において形成され、
    　前記所定停止期間は、前記生成期間より長い期間に設定される、請求項１～請求項４のいずれか一項に記載のタッチパネル制御回路。     The touch panel drive signal is formed in a plurality of generation periods having the same time length,
    The touch panel control circuit according to any one of claims 1 to 4, wherein the predetermined stop period is set to a period longer than the generation period.
  6. 　前記所定停止期間は、前記スイッチング液晶駆動信号の信号レベルの切替わりタイミングを含むように設定される、請求項５に記載のタッチパネル制御回路。 6. The touch panel control circuit according to claim 5, wherein the predetermined stop period is set to include a switching timing of a signal level of the switching liquid crystal drive signal.
  7. 　請求項１～請求項６のいずれか一項に記載のタッチパネル制御回路と、
    　前記スイッチング液晶駆動信号を生成するスイッチング液晶駆動信号生成回路と、
    　前記切替え信号に応じて、前記スイッチング液晶駆動信号を前記タッチパネル駆動信号に切替えて重ね合せ信号を生成し、該重ね合せ信号を前記共用基板に供給する、重ね合せ回路と、
    　を備えた表示装置の駆動回路。     A touch panel control circuit according to any one of claims 1 to 6,
    A switching liquid crystal drive signal generation circuit for generating the switching liquid crystal drive signal;
    In response to the switching signal, the switching liquid crystal driving signal is switched to the touch panel driving signal to generate a superposition signal, and the superposition signal is supplied to the common substrate;
    A driving circuit for a display device comprising:
  8. 　前記共用基板には、タッチパネル用電極とスイッチング液晶用電極とを共通化した共通電極が形成されており、
    　前記重ね合せ回路は、前記重ね合せ信号を前記共通電極に供給する、請求項７に記載の表示装置の駆動回路。     The common substrate is formed with a common electrode in which the electrode for touch panel and the electrode for switching liquid crystal are shared,
    The display device driving circuit according to claim 7, wherein the overlay circuit supplies the overlay signal to the common electrode.
  9. 　請求項７または請求項８に記載の表示装置の駆動回路を備えていることを特徴とする表示装置。 A display device comprising the drive circuit for the display device according to claim 7 or 8.
  10. 　前記表示パネルが液晶を用いた液晶表示パネルである、請求項９に記載の表示装置。 The display device according to claim 9, wherein the display panel is a liquid crystal display panel using liquid crystal.
  11. 　表示パネルと、前記表示パネルの表示面側に配されたタッチパネルと、３次元表示を可能とするスイッチング液晶パネルからなる視差バリアとを有する表示装置における前記タッチパネルを制御するタッチパネル制御方法であって、前記表示装置において、前記タッチパネルを構成する基板と、前記スイッチング液晶パネルを構成する二枚の基板の一方とが共用基板とされ、かつ複数のタッチパネル用電極とスイッチング液晶用電極が前記共用基板の同一平面上に形成されており、
    　該タッチパネル制御方法は、
    　前記タッチパネルを駆動するタッチパネル駆動信号を生成するタッチパネル駆動信号生成工程と、
    　前記スイッチング液晶パネルを駆動するスイッチング液晶駆動信号を受け取り、前記スイッチング液晶駆動信号の信号レベルの切替わりタイミングに対応して、前記タッチパネル駆動信号の新たな生成を所定停止期間において停止させるタッチパネル駆動信号生成停止工程と、
    　前記スイッチング液晶駆動信号を前記タッチパネル駆動信号と切替えて前記共用基板に供給するための切替え信号を、前記タッチパネル駆動信号の生成期間に対応して生成する切替え信号生成工程と、
    　前記所定停止期間において、新たな前記切替え信号の生成を停止する切替え信号生成停止工程と、
    　を含む、タッチパネル制御方法。     A touch panel control method for controlling the touch panel in a display device having a display panel, a touch panel arranged on a display surface side of the display panel, and a parallax barrier including a switching liquid crystal panel capable of three-dimensional display, In the display device, a substrate constituting the touch panel and one of the two substrates constituting the switching liquid crystal panel are used as a common substrate, and a plurality of touch panel electrodes and switching liquid crystal electrodes are the same as the common substrate. Formed on a plane,
    The touch panel control method includes:
    A touch panel drive signal generation step for generating a touch panel drive signal for driving the touch panel;
    Touch panel drive signal generation that receives a switching liquid crystal drive signal for driving the switching liquid crystal panel and stops the new generation of the touch panel drive signal in a predetermined stop period in response to the switching timing of the signal level of the switching liquid crystal drive signal A stopping process;
    A switching signal generating step for generating a switching signal for switching the switching liquid crystal driving signal to the touch panel driving signal and supplying the switching liquid crystal driving signal to the shared substrate, corresponding to a generation period of the touch panel driving signal;
    A switching signal generation stop step of stopping generation of the new switching signal in the predetermined stop period;
    Including a touch panel control method.
PCT/JP2012/070354 2011-08-16 2012-08-09 Touch panel control circuit, drive circuit for display device, display device, and touch panel control method WO2013024786A1 (en)

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JP2011-177879 2011-08-16

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008097051A (en) * 2006-10-05 2008-04-24 Sharp Corp Display device
WO2009069358A1 (en) * 2007-11-29 2009-06-04 Sharp Kabushiki Kaisha Display device
JP2011100186A (en) * 2009-11-04 2011-05-19 Casio Computer Co Ltd Liquid crystal display device with touch panel and method for driving the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008097051A (en) * 2006-10-05 2008-04-24 Sharp Corp Display device
WO2009069358A1 (en) * 2007-11-29 2009-06-04 Sharp Kabushiki Kaisha Display device
JP2011100186A (en) * 2009-11-04 2011-05-19 Casio Computer Co Ltd Liquid crystal display device with touch panel and method for driving the same

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