WO2007054018A1 - Affichage plan a effleurement numerique-analogique - Google Patents

Affichage plan a effleurement numerique-analogique Download PDF

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Publication number
WO2007054018A1
WO2007054018A1 PCT/CN2006/002983 CN2006002983W WO2007054018A1 WO 2007054018 A1 WO2007054018 A1 WO 2007054018A1 CN 2006002983 W CN2006002983 W CN 2006002983W WO 2007054018 A1 WO2007054018 A1 WO 2007054018A1
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WO
WIPO (PCT)
Prior art keywords
touch
electrode
display
electrodes
circuit
Prior art date
Application number
PCT/CN2006/002983
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English (en)
Chinese (zh)
Inventor
Qiliang Chen
Shaoguang Chen
Meiying Chen
Original Assignee
Qiliang Chen
Shaoguang Chen
Meiying Chen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qiliang Chen, Shaoguang Chen, Meiying Chen filed Critical Qiliang Chen
Publication of WO2007054018A1 publication Critical patent/WO2007054018A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—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
    • 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
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means

Definitions

  • the present invention relates to a touch screen and a flat panel display, and in particular to a touch panel display. Background technique
  • the digital capacitive touch screen is composed of two layers of electrodes each having a plurality of parallel electrodes.
  • the two layers of electrodes are orthogonal to each other.
  • the capacitance, and the leakage current flowing from the coupling capacitor determine the touch position by detecting two electrodes on the two electrodes that are orthogonal to each other and form a coupling capacitance with the finger.
  • This method is only suitable for coarse positioning, and it is unevenly displayed when placed in front of the display. When careful positioning is required, it is necessary to make a double-layered very fine electrode, which is too expensive.
  • An analog capacitive touch screen is composed of a single-layer electrode on the whole surface, and input current from four corner electrodes of a single-layer electrode.
  • Another analog capacitive touch screen is composed of two layers of electrodes each having a plurality of parallel electrodes.
  • the two layers of electrodes are orthogonal to each other.
  • the finger and the touch screen are The electrodes form a coupling capacitor, and the leakage current flowing from the coupling capacitor detects the lateral or vertical touch position on the two mutually orthogonal electrodes by detecting the magnitude of the current flowing out of each electrode.
  • This method can be finely positioned, and the drift problem is also improved, but it becomes a double-layer electrode, which increases the thickness and manufacturing difficulty of the touch screen, and is placed in front of the display to make the display uneven.
  • the current electromagnetic touch screen can also be divided into digital and analog modes.
  • the analog electromagnetic touch screen is composed of two layers of electrodes, each layer has a plurality of annular or other shaped antenna electrodes, and the long sides of the two layers of electrodes are orthogonal to each other when the stylus with signal emission function contacts the touch screen.
  • the mutually orthogonal antenna electrodes receive the electromagnetic signals emitted by the stylus and obtain the position of the stylus by calculation. This method can be finely positioned, but the control circuit is computationally intensive, costly, and inaccurate in positioning at the edges.
  • the digital electromagnetic touch screen is also composed of two layers of electrodes, each layer has a plurality of linear antenna electrodes, and the two layers of electrodes are orthogonal to each other.
  • the antenna electrode receives the electromagnetic signal emitted by the stylus, and the maximum antenna electrode that receives the electromagnetic signal through each layer respectively obtains a horizontal or vertical touch position. This method requires the preparation of a double-layered, very fine electrode, which is too costly.
  • a flat panel display with a touch screen stacks the split touch screen with the display screen, detects the planar position of the touch point through the display, and positions the cursor on the display screen following the touch point.
  • the cascading of the touch screen and the display screen makes the touch panel display thicker and heavier and the cost increases; when the touch screen is placed in front of the display screen, the reflection generated by the touch screen sensing electrode makes the display uneven and strong. The contrast is reduced in the external light environment, which affects the display effect. Integrating the touchpad and the display to make the flat panel display with touch function lighter and thinner is the direction of people's efforts.
  • the integration of the display screen and the touchpad is mainly cascading and inlaid.
  • the cascading is placed before or after the top surface of the display screen, and the display screen and the touch panel are independently displayed and touched.
  • Control tasks Chinese patent (CN20010141451, MINXIANG INDUSTRY CO LTD, 2001), Finnish patent (FI19960002692, NOKIA MOBILE PHONES LTD, 1996), Japanese patent (JP19850161986, CANON KK, 1985), (JP19900095167, NIPPON TELEGRAPH & TELEPHONE, 1990) , (JP19930306286, PFU LTD, 1993), (JP19980014850, NISSHA PRINTING, 1998), (JP19990142260, MIMA I DENSHI BUHIN KK, 1999), Korean Patent (KR20000084115, YU HWAN SE0NG; LIM J00-S00, 2000), (KR20020083301 , BANG Y0NG IK
  • Taiwan patents TW556141, AU OPTRONICS CORP, 2002
  • US patents US6215476, APPLE COMPUTER, 2001
  • other patents all proposed resistive, capacitive, electromagnetic touch
  • Various stacking schemes of the control panel and the display screen but before the touch panel is placed on the top surface of the display screen, it will affect the display brightness, contrast, sharpness, color, etc.; the electromagnetic touch panel is placed on the bottom surface of the display screen.
  • the alignment of the touchpad electrode and the display electrode is difficult, and the brightness of the display is also affected; and the method of lamination increases the overall thickness of the display; the complexity of the structure leads to a decrease in reliability, and is caused by the production process. The complexity of assembly and assembly is also costly.
  • the mosaic type embeds the touch sensor into the display screen, and a sensor (mostly an optical sensor) is disposed beside each display pixel, and the display pixel and the sensor are connected by a double electrode, and the display driving signal and the touch detection signal are respectively transmitted.
  • Korean patent JUNG Y0NG CHAE; YANG DONG YU, 2003), (R20030077574, CHOI J00N-H00; J00 IN-S00, 2003), German patent (GB0304587.
  • Taiwan patent TW20020116058, LEE YU-TUAN, 2002
  • the change of capacitance between the boxes is caused by the change of the thickness of the box caused by the touch pressure.
  • the support between the boxes makes it necessary to change the thickness of the liquid crystal display, and changing the thickness of the liquid crystal display must affect the display.
  • the dielectric anisotropy of the liquid crystal material causes the capacitance between the boxes to change with the display.
  • the charging method in the patent excludes the change of the capacitance between the cells caused by the dielectric anisotropy of the liquid crystal material and affects the display. Therefore, it is not preferable to detect the touch capacitance of the liquid crystal display to detect the touch.
  • Chinese patents such as 200510080825X and 2005100861285 are proposed to allow the display panel of the flat panel display to be time-divided or to be connected to the display driving circuit or the touch panel through a plurality of analog switch groups.
  • the control signal circuit is connected, and the display row electrode and the column electrode are used as the touch electrode to sense the touch;
  • the Chinese patent No. 2005100861285 and the like are proposed, and the display panel electrode of the flat panel display is simultaneously displayed with the display driving circuit and the touch through the signal loading circuit.
  • the signal circuit is connected, and the display row electrode and the column electrode are used as the touch electrode to sense the touch; so that no additional sensor is needed in the display screen of the existing structure, so that the flat panel display screen has the capability of sensing the touch signal.
  • the electrodes in the upper layer shield the touch signals of the electrodes in the lower layer, so that the reference of the vertical and horizontal touch sensing is different, and the touch detection is performed. Bring difficulties. Summary of the invention
  • the present invention aims to provide a single-layer electrode using a flat panel display as a touch electrode, and to sense touch positioning by a combination of digital and analog methods.
  • the flat panel display not only has a display function, but also has a touch function, which is versatile.
  • a typical dot matrix flat panel display includes display pixels, row electrodes (scan electrodes) for transmitting display drive scan signals, and column electrodes (data electrodes) for data signals, such as TN-LCD and STN.
  • a passive flat panel display such as an LCD
  • a pixel and an electrode share a conductive film at a position of a display pixel
  • an active flat panel display such as a TFT-LCD
  • a pixel input port is connected to a drain of the TFT, and the TFT
  • the gate and source are connected to the scan electrode and the signal electrode, respectively.
  • the electrode (row electrode or column electrode) in a certain direction of the flat panel display screen is used as the touch electrode to sense the touch, and both ends of the electrode in the direction are connected to the touch signal circuit, and the two are positive.
  • different touch positioning methods are used, and the position of the touch electrode is determined by comparing the difference of the touch signals sensed by different electrodes in a direction perpendicular to the electrode by a digital touch positioning method;
  • the direction of the electrode is determined by the analog touch positioning method, and the position of the touch point on the touch electrode is determined by comparing the difference between the touch signals at both ends of the touch electrode; thereby obtaining the position of the touch point on the touch screen plane.
  • the sensing of the touch signal by the electrode can be in various forms, such as a capacitive type, an electromagnetic type, a photoelectric type, and the like.
  • the capacitive touch solution is to make the electrodes of one direction of the flat panel display display such as the row electrodes as the lead ends, so that one end of each electrode passes through the analog switch or communicates with the display driving circuit or with a touch.
  • the signal circuit is connected such that the other end of the electrode is passed through an analog switch or suspended or in communication with another touch signal circuit.
  • the analog switch is controlled by the control circuit, so that the electrode communicates with the display driving circuit at one end to transmit the display driving signal, and the other end is in a floating state; at the next moment, the control circuit connects the two ends of the electrode to the touch signal circuit at the same time to transmit the touch. The signal is then returned to the state where the previous moment is connected to the display driving circuit and the other end is in a floating state, so that the switching is repeated.
  • the electrode is used as the touch electrode to sense the touch, and is positioned in a digital manner perpendicular to the direction of the electrode.
  • the finger and the display are The electrodes form a coupling capacitor, and the leakage current flowing from the coupling capacitor determines the touch position by detecting the electrode forming the coupling capacitance with the finger; the analog position is parallel to the electrode direction, and is respectively connected from the touch signal circuit.
  • the two ends of the display electrode input current to the electrode.
  • the finger forms a coupling capacitance with the electrode, and the leakage current flowing from the coupling capacitor detects and compares the electrical signals flowing to the electrodes at both ends of the electrode.
  • the touch position from which the current flows from the finger is calculated, and the touch position is located thereby; the touch position is determined by the touch positions in two orthogonal directions.
  • the electrical signal for detecting and comparing from the two ends of the electrode may be a current signal or a voltage signal; it may be an amplitude signal, which may be a pulse width signal, and may be a frequency signal or a phase signal.
  • the electromagnetic touch scheme is to make the electrodes of a certain direction of the flat panel display screen, such as the row electrodes, as the lead ends, so that one end of each electrode passes through the analog switch or communicates with the display driving circuit or with a touch.
  • the signal circuit is connected such that the other end of the electrode is passed through an analog switch or suspended or in communication with another touch signal circuit.
  • the analog switch is controlled by the control circuit, so that the electrode communicates with the display driving circuit at one end to transmit the display driving signal, and the other end is in a floating state, so that the electrodes are respectively connected with the touch signal circuit to transmit the touch signal at the two ends at the next moment, and then Then, one end of the previous time is connected to the display driving circuit and the other end is in a floating state, so that the switching is repeated.
  • the electrode is used as the touch antenna electrode to sense the touch, and is vertically positioned in the direction perpendicular to the electrode to be positioned.
  • the antenna electrode receives the electromagnetic signal emitted by the stylus, determines the touch electrode by detecting the electrode that receives the touch electromagnetic signal, and uses the analog method to locate in parallel with the electrode direction.
  • the touch electromagnetic signals are respectively sampled from the two ends of each electrode of the parallel electrode group, and the position of the touch point on the touch electrode is determined by comparing the difference between the touch signals at both ends of the touch electrode; The touch position is obtained by the position of the touch point on the touch screen plane.
  • the touch electromagnetic signal sampled from both ends of the electrode and used for comparison may be an amplitude signal, may be a pulse width signal, may be a frequency signal, or may be a phase signal.
  • a sense amplifier can be disposed in the touch signal circuit; in order to process the read signal, an analog-to-digital converter can be disposed in the touch signal circuit.
  • the electrode with the largest signal is used as the touch positioning point, or the middle position of the touch electrode for detecting the touch signal is the touch positioning point.
  • the analog switch that connects one end of the display electrode or the display driving circuit or communicates with a touch signal circuit may be a single-pole double-throw analog switch, one end of the switch is fixedly connected to the display electrode, and the other ends are connected to the display driving circuit and the connection touch
  • the control signal circuit allows the switch to switch the display electrode between the display display driving circuit or the connected touch signal circuit; the analog switch that connects one end of the display electrode to the display driving circuit or communicates with a touch signal circuit, It can also be two single-pole single-throw analog switches.
  • the display electrode is connected to the display drive circuit through a single-pole single-throw analog switch, and is connected to the touch signal circuit through another single-pole single-throw analog switch.
  • the control circuit allows two of the same display electrodes to be connected. A single-pole single-throw analog switch is not connected at the same time.
  • Each of the switches of the analog switch group that connects one end of each of the electrodes of the display screen to the display drive circuit or to a touch signal circuit, and an analog switch that causes the other end of each electrode to be either suspended or connected to another touch signal circuit
  • Each switch in the group may be switched by the scanning mode control one by one, or may be controlled by the simultaneous mode.
  • the switching between the display driving circuit and the touch signal circuit may be when the display part electrode is connected to the display driving circuit, and another part of the electrode is connected to the touch signal circuit, that is, the display electrode is switched from the connected display driving circuit to Connected touch signal circuit is in display driver
  • the switching of the analog switch group between the display driving circuit and the touch signal circuit may also be when the display driving signal is stopped at any electrode of the display screen.
  • the display electrode is switched from the connected display driving circuit to the touch signal circuit, that is, the display electrode is switched from the connected display driving circuit to the connected touch signal circuit, which is performed outside the frame of the display driving, that is, the display electrode is Switching the connected display drive circuit to the connected touch signal circuit is performed between frames of the display drive.
  • a fixed level signal may be output to the display electrode that is not turned from the connected display driving circuit to the touch signal circuit, in particular It is zero level.
  • the flat panel display may be a TN type STN type or TFT type liquid crystal display, a 0 LED display, a PDP display, or another flat panel display.
  • the display electrode used to transmit the display signal and to sense and transmit the touch may be the row electrode of the display screen or the column electrode of the display screen.
  • the display driving electrode of the display screen also functions as a touch signal sensing electrode, and the digital signal combined touch signal sensing method eliminates the need to add any process during the manufacturing process of the display without the touch function. New processes, materials and elements make it a display with the ability to sense touch signals. BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure 1 is a schematic diagram of the electrical connection of a digital-to-analog capacitive touch-screen LCD with a row electrode as a touch electrode.
  • FIG. 2 is a schematic diagram of electrical connection of a digital-analog electromagnetic touch passive liquid crystal display with a row electrode as a touch electrode.
  • FIG. 3 is a schematic diagram of electrical connection of a digital-analog electromagnetic touch active liquid crystal display with a column electrode as a touch electrode.
  • FIG. 1 a digital-to-analog capacitive touch liquid crystal display 100 that uses a row electrode as a touch electrode in a display-driven frame.
  • the liquid crystal display 100 has a display substrate 110, a lower display substrate 120, a row electrode 111, a column electrode 121, a row display driving circuit 130, a column display driving circuit 140, a touch signal circuit 150, and a single-pole double-throw analog switch group.
  • the row electrodes 111 are specifically formed to have terminals from both sides and are connected to the single-pole double-throw analog switch group 160 and the single-pole single-throw analog switch group 170, respectively.
  • the normal state is that the single-pole double-throw analog switch group 160 causes one end of the row electrode 111 to communicate with the display driving circuit 130 to transmit a display driving signal, and the single-pole single-throw analog switch group 170 causes the other end of the row electrode 111 to be in a floating state; the control circuit 180 makes the single-pole double-throwing
  • the analog switch group 160 and the single-pole single-throw analog switch group 170 respectively connect the two ends of the electrodes of the row electrode 111 to the touch signal circuit 150 to transmit the touch signals, and then return to the normal end.
  • the display driving circuit 130 is in a state in which the other end is in a floating state, and thus the switching is repeated.
  • the touch signal circuit 150 outputs current from the two ends of each electrode of the row electrode 111 to the electrode, and when the human finger 190 touches the touch screen, the finger 190 and the row electrode 111 form a coupling capacitance, and the leakage current flowing from the coupling capacitor, the touch signal circuit 150 checks whether the touched current exceeds a certain threshold, and when the number of electrodes exceeding the threshold is an odd number
  • the middle electrode is used as the touch electrode.
  • one of the middle two electrodes is used as a touch electrode, and the touch positioning position in one direction is determined by a digital method;
  • the touch positioning point is determined by the touch positions of the two orthogonal directions, so that the liquid crystal display 100 is used
  • the display is also used for touch, and no separate touch screen is needed.
  • the second embodiment of the present invention is also shown in FIG. 1.
  • a digital-to-analog capacitive touch liquid crystal display 100 with a row electrode as a touch electrode is performed between frames of display driving.
  • the liquid crystal display 100 has a display substrate 110, a lower display substrate 120, a row electrode 111, a column electrode 121, a row display driving circuit 130, a column display driving circuit 140, a touch signal circuit 150, and a single-pole double-throw analog switch group. 160 and single-pole single-throw analog switch group 170, control circuit 180, etc. to make.
  • the row electrodes 111 are specifically formed to have terminals from both sides and are connected to the single-pole double-throw analog switch group 160 and the single-pole single-throw analog switch group 170, respectively.
  • the normal state is that the single-pole double-throw analog switch group 160 causes one end of the row electrode 111 to communicate with the display driving circuit 130 to transmit a display driving signal, and the single-pole single-throw analog switch group 170 is turned off to make the other end of the row electrode 111 in a floating state; the control circuit 180 is displaying Between the frames of the driving, the row display driving circuit 130 and the column display driving circuit 140 stop outputting the driving signal to any of the electrodes of the display screen, and only output the zero potential signal, and then the single-pole double-throwing analog switch group 160 and the single-pole single-single The throwing analog switch group 170 disconnects the electrodes of the row electrode 111 from the row display driving circuit 130 one by one, and connects the two ends of the electrode to the touch signal circuit 150 to transmit the touch signal, and then returns.
  • One end of the normal row electrode 111 is connected to the row display driving circuit 130 and the other end is suspended.
  • the touch signal circuit 150 outputs current from the two ends of each electrode of the row electrode 111 to the electrode, and when the finger 190 of the person touches the touch screen, the finger 190 and the row electrode 111 form a coupling capacitance, and the leakage current flowing from the coupling capacitor, the touch signal circuit 150 checks whether the touched current exceeds a certain threshold, and the number of electrodes exceeding the threshold is an odd number.
  • the middle electrode is used as the touch electrode.
  • one of the middle two electrodes is used as the touch electrode, and the touch positioning position in one direction is determined by a digital method; and the touch electrode is compared.
  • the two sides respectively flow to the magnitude of the electrode current, and the touch positioning position of the finger 190 in the other direction is calculated by an analog method; the touch positioning point is determined by the touch positions of the two orthogonal directions, so that the liquid crystal display 100 is It is used for display and for touch, and no separate touch screen is required.
  • FIG. 2 The third embodiment of the present invention is shown in FIG. 2 : a digital-analog electromagnetic touch passive liquid crystal display 200 with a row electrode as a touch electrode.
  • the group 260 is composed of a single-pole single-throw analog switch group 270, a control circuit 280, and the like.
  • the row electrodes 211 are specifically made to have terminals from both sides and are connected to the single-pole double-throw simulation switch group 260 and the single-pole single-throw analog switch group 270, respectively.
  • the normal state is a single-pole double-throw analog switch group 260 that causes the row electrodes 211 to be
  • the end-to-row display driving circuit 230 communicates with the display display driving signal, and the single-pole single-throw analog switch group 270 is turned off to make the other end of the row electrode 211 in a floating state; the control circuit 280 allows the single-pole double-throwing analog switch group 260 and the single-pole single-throw analog switch group. 270 in the manner of scanning, the electrodes of the row electrode 211 are disconnected from the row display driving circuit 230 one by one, and the two ends are simultaneously connected with the touch signal circuit 250 to transmit the touch signal, and then return to the normal end and row.
  • the display driving circuit 230 is in a state in which the other end is in a floating state, and thus the switching is repeated.
  • the touch signal circuit 250 detects the electromagnetic touch signals at both ends of the electrodes of the row electrode 211 at the time when the two ends of the row electrodes 211 are respectively connected to the touch signal circuit 250, and the stylus pen 290 having the electromagnetic signal transmitting function is detected.
  • the touch screen is touched, a part of the electrodes of the row electrode 211 receives the electromagnetic touch signal emitted by the stylus 290, and the touch signal circuit 250 detects the touch signal exceeding a certain threshold to check whether the touch is touched.
  • the middle electrode is used as the touch electrode
  • the number of electrodes exceeding the threshold is an even number
  • one of the middle two electrodes is used as the touch electrode, and the touch positioning position in one direction is determined by a digital method. Comparing the phase difference of the touch signals detected at the two ends of the touch electrode, and calculating the touch positioning position of the stylus 290 in another direction by an analog method; the touch positions through two orthogonal directions
  • the liquid crystal display 200 is used for both display and touch, and no separate touch screen is needed.
  • the fourth embodiment of the present invention is shown in FIG. 3: a digital-analog electromagnetic touch active liquid crystal display 300 in which one or more electrodes are touch electrodes.
  • the liquid crystal display 300 has a substrate glass 310, a row electrode 311, a column electrode 312, a display pixel 313, a display lower substrate glass 320, a row display driving circuit 330, a column display driving circuit 340, a touch signal circuit 350, and a single knife.
  • the double throw analog switch group 360 and the single pole single throw analog switch group 370, the control circuit 380, and the like are composed.
  • the column electrodes 312 are specifically made to have terminals from both sides and are connected to the single-pole double-throw simulation switch group 360 and the single-pole single-throw analog switch group 370, respectively.
  • the normal state is that the single-pole single-pole double-throw analog switch group 360 causes the column electrode 312-end to communicate with the column display driving circuit 340 to transmit a display driving signal, and the single-pole single-throw analog switch group 370 is turned off to make the other end of the column electrode 312 in a floating state;
  • the control circuit 380 causes the single-pole double-throw analog switch group 360 connected to the column display driving circuit 340 to disconnect one end of each electrode of the column electrode 312 from the column display driving circuit 340, and the single-pole double-throw analog switch group
  • the 360 and single-pole single-throw analog switch group 370 causes the electrodes of the column electrodes 312 to communicate with the touch signal circuit 350 at the same time to transmit the touch signals; and then return to the normal end and the column display driving circuit 340 is connected to the other end and is floating.
  • the touch signal circuit 350 detects the electromagnetic touch signals at both ends of the electrodes of the column electrodes 312 one by one in the manner of scanning, and has an electromagnetic signal.
  • the stylus 390 of the transmitting function contacts the touch screen
  • part of the electrodes of the column electrode 312 receives the electromagnetic touch signal emitted by the stylus 390, and the touch signal circuit 350 detects the touch signal exceeding a certain threshold. Whether the touch is performed.
  • the middle electrode is used as the touch electrode.
  • one of the middle two electrodes is used as the touch electrode, and a digital method is used to determine one.
  • the position of the touch position of the touch sensor; the phase difference of the touch signals detected at the two ends of the touch electrode is compared, and the touch position of the touch pen 390 in the other direction is calculated by an analog method;
  • the touch position in the intersecting direction determines the touch positioning point, so that the liquid crystal display 300 is used for both display and touch, and no separate touch screen is needed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Position Input By Displaying (AREA)

Abstract

L'invention concerne un dispositif d'affichage plan qui comprend des électrodes de ligne et des électrodes de colonne. Les électrodes orientées dans une direction servent d'électrodes d'effleurement afin de détecter un effleurement et des extrémités de tête qui sont connectées à un circuit de signalisation d'effleurement sont formées sur les deux extrémités des électrodes orientées dans la même direction. Différents modes de positionnement de l'effleurement sont utilisés dans la direction orthogonale, respectivement. Le mode numérique de positionnement de l'effleurement est appliqué dans la direction perpendiculaire aux électrodes et les positions des électrodes d'effleurement sont déterminées par la comparaison de la différence des signaux d'effleurement détectées par les différentes électrodes. Le mode analogique de positionnement de l'effleurement est appliqué dans la direction parallèle aux électrodes et les positions des points de contact sur les électrodes d'effleurement sont déterminées par comparaison de la différence des signaux d'effleurement sur les extrémités des électrodes d'effleurement. Par conséquent, la position du point de contact sur un plan de l'écran d'effleurement peut être obtenue.
PCT/CN2006/002983 2005-11-12 2006-11-08 Affichage plan a effleurement numerique-analogique WO2007054018A1 (fr)

Applications Claiming Priority (2)

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CN200510124471.4 2005-11-12
CN200510124471A CN1963736B (zh) 2005-11-12 2005-11-12 数模触控式平板显示器

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WO2007054018A1 true WO2007054018A1 (fr) 2007-05-18

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US8633915B2 (en) 2007-10-04 2014-01-21 Apple Inc. Single-layer touch-sensitive display
US9280251B2 (en) 2014-07-11 2016-03-08 Apple Inc. Funneled touch sensor routing
US10534481B2 (en) 2015-09-30 2020-01-14 Apple Inc. High aspect ratio capacitive sensor panel
US10642418B2 (en) 2017-04-20 2020-05-05 Apple Inc. Finger tracking in wet environment
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