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WO2013024786A1 - Circuit de commande de panneau tactile, circuit de commande pour dispositif d'affichage, dispositif d'affichage et procédé de commande de panneau tactile - Google Patents

Circuit de commande de panneau tactile, circuit de commande pour dispositif d'affichage, dispositif d'affichage et procédé de commande de panneau tactile 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
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/070354
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English (en)
Japanese (ja)
Inventor
岡田　厚志
坂本　敦
浜田　浩
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Sharp Corp
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Sharp Corp
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Filing date
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Publication of WO2013024786A1 publication Critical patent/WO2013024786A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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 OR CALCULATING; 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 OR CALCULATING; 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 OR CALCULATING; 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 OR CALCULATING; 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 OR CALCULATING; 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

L'invention porte sur un circuit de commande de panneau tactile (60) qui comprend un circuit de génération de signal de commutation (61), un circuit de génération de signal de commande de panneau tactile (62) pour générer des signaux de commande de panneau tactile (Tx1-Tx16) pour commander un panneau tactile, et un circuit de génération de signal d'arrêt (90). Le circuit de génération de signal d'arrêt (90) reçoit un signal de commande de commutation de cristaux liquides (SW), et génère un signal d'arrêt (ST) pour arrêter la génération des signaux de commande de panneau tactile (Tx1-Tx16) pendant une période d'arrêt prédéterminée à la temporisation à laquelle le niveau de signal du signal de commande de commutation de cristaux liquides (SW) change. En réponse au signal d'arrêt (ST), le circuit de génération de signal de commutation arrête la génération de nouveaux signaux de commutation (SEL) pendant la période d'arrêt prédéterminée.
PCT/JP2012/070354 2011-08-16 2012-08-09 Circuit de commande de panneau tactile, circuit de commande pour dispositif d'affichage, dispositif d'affichage et procédé de commande de panneau tactile Ceased WO2013024786A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011177879 2011-08-16
JP2011-177879 2011-08-16

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WO2013024786A1 true WO2013024786A1 (fr) 2013-02-21

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PCT/JP2012/070354 Ceased WO2013024786A1 (fr) 2011-08-16 2012-08-09 Circuit de commande de panneau tactile, circuit de commande pour dispositif d'affichage, dispositif d'affichage et procédé de commande de panneau tactile

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008097051A (ja) * 2006-10-05 2008-04-24 Sharp Corp 表示装置
WO2009069358A1 (fr) * 2007-11-29 2009-06-04 Sharp Kabushiki Kaisha Dispositif d'affichage
JP2011100186A (ja) * 2009-11-04 2011-05-19 Casio Computer Co Ltd タッチパネル付き液晶表示装置とその駆動方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008097051A (ja) * 2006-10-05 2008-04-24 Sharp Corp 表示装置
WO2009069358A1 (fr) * 2007-11-29 2009-06-04 Sharp Kabushiki Kaisha Dispositif d'affichage
JP2011100186A (ja) * 2009-11-04 2011-05-19 Casio Computer Co Ltd タッチパネル付き液晶表示装置とその駆動方法

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