WO2007054018A1 - Digital-analog touch control plane display - Google Patents

Digital-analog touch control plane display

Info

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
Authority
WO
Grant status
Application
Patent type
Prior art keywords
touch
electrode
signal
display
circuit
Prior art date
Application number
PCT/CN2006/002983
Other languages
French (fr)
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

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Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/047Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires

Abstract

A plane display device has row electrodes and column electrodes, wherein the electrodes in a direction are used as touch control electrodes for sensing touch control, and leading ends which are connected to a touch control signal circuit are formed on both ends of the electrodes in this direction. Different touch control positioning modes are used in the orthogonal direction, respectively. The digital touch control positioning mode is applied in the direction perpendicular to the electrodes, and the positions of the touch control electrodes are determined by comparing the difference of the touch control signals sensed by the different electrodes. The analog touch control positioning mode is applied in the direction parallel to the electrodes, and the positions of touch points on the touch control electrodes are determined by comparing the difference of the touch control signals on the ends of the touch control electrodes. Therefore, the position of touching point on a plane of the touch control screen can be obtained.

Description

Instructions

Digital to analog touch screen FPD Field

The present invention relates to a touch screen flat panel display and, more particularly, to a touch screen FPD. Background technique

Current capacitive touch screen can be divided into analog and digital two ways. Digital capacitive touch screen is composed of two layers of electrodes each plurality of parallel electrode composed of two layers of electrodes orthogonal to each other, when a human finger touches the touch screen, some of the finger electrode and a coupling on the touch screen capacitance, the coupling capacitance and the leakage current from flowing, and the touch position is determined by detecting the two electrodes forming two layers of electrodes orthogonal to each other with the fingers coupling capacitance. Such a method is only suitable for coarse positioning, and placed in front of the display will display unevenness, when the required fine positioning, to making very fine bilayer electrode, the cost is too high.

An analog capacitive touch screen is a single-layer electrode composed of the entire surface, the input current to the electrode, when a human finger touches the touch screen, finger and the coupling capacitor electrode formed from the four corners of the single-layer electrode, and from coupling capacitor leakage current flowing, the flow of the four corners, respectively, by detecting the size of the electrode current, - to calculate the current flowing from the touch position of the finger. This method can be carefully positioned, the control amount computing circuit, at ambient temperature, humidity changes, electric field environment changes, can cause drift, resulting in inaccurate positioning.

Another analog capacitive touch screen is composed of two layers of electrode strips a plurality of parallel electrodes each composed of two layers of electrodes orthogonal to each other, when a human finger touches the touch screen, a finger on the touch screen these electrode forming the coupling capacitance, the coupling capacitance and the leakage current from flowing, the current flowing through the size of each of the detection electrodes, respectively, each calculate the horizontal or vertical position of the touch on two orthogonal electrodes. This method can be carefully positioned on the drift also improved, but the electrode becomes double, and increases the thickness of the touch screen system harder to do, and placed in front of the display also cause display unevenness. Current magnetic touch screen can be divided into analog and digital two ways. Analog electromagnetic touch screen electrode is composed of two layers, each mutually orthogonal plurality of toroidal or other shape antenna electrode length direction of the electrode layers, when the stylus contacts a signal having a transmitting function touch screen , antenna electrode perpendicular to each other stylus received electromagnetic signal emitted is obtained by calculating the position of the stylus. Such targeting method may be fine, but the control circuit is computationally intensive, costly, inaccurate and is positioned at the edge.

Digital Electromagnetic touch screen electrode is composed of two layers, each layer of a plurality of linear antenna electrode, two layers of electrodes orthogonal to each other when the stylus contacts a signal having a transmitting function touch screen, portions orthogonal to each other receiving electromagnetic antenna electrode stylus signal emitted by the antenna electrode layers maximum receiving electromagnetic signals, obtained respectively horizontal or vertical position of the touch. Such method needs a very fine double making electrodes, high cost.

A flat panel display with a touch panel is laminated together with the separate touch screen display, through the display screen to detect a plane position of the touch, and then follow the cursor on the display screen of the touch point is positioned. Laminating the touch screen and the display screen so that the touch screen FPD weight thickening and increased costs; touch screen is placed at the front of the display, reflection generated touch screen sensing electrodes such that the display unevenness will strong and lowered display contrast under ambient light conditions, affect the appearance. The touch panel and the display are integrated into one, so that a flat panel display with touch function becomes thinner and lighter, it is the direction of efforts.

Before and after top or bottom surface of the touch panel display and integrated manner mainly two kinds of mosaic and stacked, the stacked touch panel is placed on the display screen, the display and the touch panel display and a touch each independently bear control task, Chinese patent (CN20010141451, MINXIANG INDUSTRY CO LTD, 2001), the 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; etc., 2002), Taiwan patent (TW556141, AU OPTRONICS CORP, 2002), United States patent (US6215476, APPLE COMPUTER, 2001), (US20030347603, TOPPOLY OPTOELECTRONICS CORP, 2003), such as patents, are proposed various programs stacked resistive, capacitive, electromagnetic touch panel and a display screen, but the screen is placed before the top surface of the touch panel Affect the display brightness, contrast, sharpness, color display; after electromagnetic touch screen panel is placed a bottom surface of the touch panel and the display electrode of the electrode alignment difficulties, will also affect the brightness of the display; and the method of lamination will increase the overall thickness of the display; complicated structure, will lead to decreased reliability, complicated by the complex production process and assembly is also to make the cost high.

The mosaic is embedded in the touch screen sensor, a sensor disposed adjacent pixel (multi-optical sensor) in each of the display, the display pixel electrode is connected with a double sensor and respectively transmit the display driving signal and the touch detection signal, Korean Patent (KR20030019631, JUNG Y0NG CHAE; YANG DONG YU, 2003), (R20030077574, CHOI J00N-H00; J00 IN- S00, 2003), German Patent (. GB0304587 9, SHARP, 2003), US Patent (US19970955388, SONY ELECTRONICS INC, 1997), (US19980135959, I shall, 1998), (US20030721129, EASTMAN KODAK CO, 2003) and other patents, were also proposed mosaic program, but the touch sensor into the display screen and dual damascene electrode the manufacturing process is complicated and difficult extraction electrodes, and thus costly to make, and can also interfere with each other and the display drive signal of the touch detection signal.

Others have tried to rely on inter-box method to detect the capacitance of the LCD screen to detect touch, such as Taiwan patent (TW20020116058, LEE YU- TUAN, 2002), changes in capacitance between the boxes is by touch pressure causes a change in the cell thickness to produce, strut between the cartridge to be changed so that the cell gap of the LCD requires a large force, and the change of the cell gap of the liquid crystal display will certainly affect the display, the dielectric anisotropy of the liquid crystal material between the cartridge and such that the capacitance changes in response to the display, to the charging method which would affect Patent negative dielectric anisotropy of the liquid crystal material due to a variation in capacitance between the display box, the box between such detection method of the LCD touch probe capacitance is undesirable.

Application No. 2005100861285 200510080825X and other Chinese patent proposes, through the analog switch group so that a number of flat panel display screen or a division electrode display driving circuit or circuits in communication with the touch signal, the display screen using the row and column electrodes as touch the touch sensing electrodes; Chinese application No. 2005100861285 patent proposes the like, the signal loading circuit by a flat panel display so that the display electrodes are simultaneously in communication with the display driving circuit and a touch signal circuit, the display screen using the row and column electrodes as touch electrode the touch sensing; manufactured such that no additional display in the conventional structure do any sensor, so that a flat panel display screen having a touch signal sensing capability. However, when the reference row and column electrodes at the upper and lower substrates on different substrates, in the upper electrode, the touch signal is present on the lower layer shield electrode, such that longitudinal and transverse directions is not the same touch sensing, to touch detection difficult. SUMMARY

The present invention aims to provide a method of sensing a touch using a single-layer electrode is positioned as the touch screen flat panel display electrodes, digital and analog combination. Make flat panel displays not only display functions, but also has a touch function, a multi-purpose.

Technical solutions of the present invention is: a dot matrix flat panel displays typically include a display pixel, to transmit the display column electrodes (data electrodes) row electrodes (scanning electrode) driving the scan signal and the data signal, such as in the TN-LCD and STN - LCD and other passive flat panel displays, the display pixel and the common electrode conductive film at the position of the display pixel; TFT- LCD and the like as the active flat panel displays, the display pixels of the drain input port of the TFT, TFT the gate and source are then connected to the scan electrodes and signal electrodes. Electrodes (row or column electrode) by using a flat panel display screen in a certain direction as the touch sensing electrodes sense the touch, the direction of both ends of the electrodes are making leading ends of the touch signal circuit, the two n targeting different touch in the direction perpendicular to the electrode with a digital touch targeting a direction orthogonal to the electrodes of the touch position is determined by the difference between the sensed electrode signal, compare the touch; parallel to direction of the electrode by the analog touch targeting methods to determine the position of the touch point on the touch electrode by a difference between both ends of the touch signals comparing the touch electrode; to give the position of the touch point on the touch screen plane .

Sensing electrode and the touch signal can take many forms, such as capacitive, electromagnetic, photoelectric like. Capacitive touch solution is: a flat panel display screen electrodes in one direction as row electrodes at both ends were prepared for the leading ends, so that one end of each electrode through an analog switch or the display driving circuit in communication with a touch or signal communication circuit, the other end of the electrode is left floating, or through an analog switch or a touch signal with another communication circuit. Analog switch is control circuit, one end of the electrode at a time in communication with the display driving circuit to transmit the display driving signals, and the other end in a suspended state; and a control circuit at the next moment, so that the touch signal simultaneously with the communication circuit to transmit the touch across the electrodes signal; then return to the end of the previous time and the other end communicates display driving circuit is floating state, so that repeated switching. When communicating across the electrodes of the touch signal circuit, respectively, as the touch sensing electrodes of the touch sensing electrodes, in a direction perpendicular to the electrode digitally locating, when human finger contacting the display, on a display screen with a finger these electrode forming the coupling capacitance, the coupling capacitance and the leakage current flowing from the coupling capacitance electrode is formed is determined by detecting the touch position of the finger; in a direction parallel to the electrode positioned analog manner, each with a touch signal from the communication circuit both ends of the display electrode to the electrode of the input current, when the contact screen a human finger, the finger and the electrode forming the coupling capacitance, the coupling capacitance and the leakage current from flowing, and comparing each electrical signal flowing through the electrode ends detecting electrode, flows from the calculated current location of the finger touch, and thus locating the position of a touch; determining a touch position by the touch point locating two orthogonal directions. An electrical signal from across the electrodes for detecting and sampling the comparison, may be a current signal, may be a voltage signal; amplitude signal may be, may be a pulse width signal, a signal may be frequency, phase may be a signal.

Electromagnetic touch solution is: a flat panel display screen electrodes in one direction as row electrodes at both ends were prepared for the leading ends, so that one end of each electrode through an analog switch or the display driving circuit in communication with a touch or signal communication circuit, the other end of the electrode is left floating, or through an analog switch or a touch signal with another communication circuit. Analog switch is control circuit, one end of the electrode at a time in communication with the display driving circuit to transmit the display driving signals, and the other end is floating, the electrodes transmit the touch signal simultaneously communicate with both ends of the touch signal circuit at the next time, then back to the end of the previous time and the display driving circuit is in communication with the other end of the suspended state, so that repeated switching. When both ends of the electrodes are in communication with the touch signal circuit, an antenna with touch sensing electrodes as touch sensing electrodes, in a direction perpendicular to the electrode digitally locating, with a signal when the stylus contacts the touch screen transmitting function , the antenna electrode receiving electromagnetic signals emitted by the stylus, the touch electrode is determined electromagnetic signals received by the electrode of the touch detection; analog manner parallel to the electrode positioned in a direction, each of the electrodes from the two sets of parallel electrodes sampling touch each end electromagnetic signals to determine the position of the touch point on the touch electrode by a difference between both ends of the touch signals comparing the touch electrode; touch-touch points obtained by the touch positions of the two orthogonal directions control panel position on the plane. Sampling from both ends of the electrode for a touch and an electromagnetic signal to be compared, the amplitude signal may be, may be a pulse width signal, a signal may be frequency, phase may be a signal.

To sense weak signal coupling between the electrodes was measured and the touch screen, the touch signal may be provided a sense amplifier circuit; to read out the process, it may be provided within touch signal analog-signal circuit.

When a plurality of touch signal detected by the electrodes to the maximum signal point positioning a touch electrode, or intermediate position of the touch detection electrode for the touch signal to the touch point locating.

One end of the display electrode or the analog switch in communication with the display driving circuit and a touch signal or a communication circuit may be a single pole double throw analog switch end, is fixedly connected to the switch display electrode, and the other ends connected to the display driving circuit is connected and a contact a signal control circuit, a switch control circuit so that the display electrode display driving circuit in communication or communication between the touch signal switching circuit; or so that one end of the display electrode and the display driving circuit and a touch signal communication circuit or an analog communication Jian off, may be two single pole single throw analog switch, a display electrode via a SPST switch with analog display driving circuit is connected through another SPST analog switch circuit with the touch signal, the control circuit so that the two connections to the same display electrode a SPST analog switch does not communicate simultaneously.

One end of each electrode so that the display screen or a display driving circuit communication with the or each switching the analog switch group and a touch signal communication circuit, and the other end of each electrode or floating or another touch signal communication with an analog switch circuit each switch in the group, may be controlled one by one scan mode switching operation may be performed simultaneously controls the switching operation simultaneously.

Analog switch group switching between the display driving circuit and the touch signal circuit, the electrodes may be in communication with the partial screen display driving circuit, the other portion of the electrode of the touch signal circuit communication, i.e. communication from the display electrode to a display driving circuit switch touch signal communication circuit display driving is performed in the frame; display drive signal in order to prevent interference on the touch signal, switching the analog switch group between the circuit and the display driving circuit of the touch signal, may be stopped in any display electrode output display drive signals, only the communication from the display electrode display driving circuit of the touch signal steering circuit communication, i.e. communication from the display electrode to a display driving circuit switched communication of the touch signal circuit is an outer frame of the display driving carried out, i.e. the communication from the display electrode display driving circuit of the touch signal circuit is switched to the communication is performed between frames of the display driver. When the display drive signal is stopped for any display output electrode, in order to prevent interference with the touch signal is not displayed on the display screen communicating electrode driving circuit communication touch signal steering circuit, a constant output signal level, particularly a zero level.

A flat panel display may be a TN type or STN type TFT type liquid crystal display, 0LED display, the PDP displays, flat panel displays may be another.

Both for transmitting display signals for the display electrodes and sensing and transmission of touch, the display may be row electrodes, the column electrodes may be a display screen.

Such a display screen to display the driving electrodes also serving as a touch signal sensing electrodes, and signal to the touch sensing method of digital-analog bound, such that no need usually without the touch function of the display screen making process, any increase new processes, materials and elements to become aware of the touch screen capability signal. BRIEF DESCRIPTION OF DRAWINGS

Figure 1 is the number of row electrodes of the liquid crystal touch mode capacitive touch screen electrically connected to the electrode FIG.

FIG 2 is a to the row electrodes of the display electrodes is the number of the touch touch mode electromagnetic passive electrical connection diagram of the liquid crystal.

FIG 3 is a kind of column electrodes of the display screen is the number of mode electromagnetic touch electrode active liquid crystal touch electrical connection diagram. DETAILED DESCRIPTION Example embodiments One embodiment of the present invention shown in Figure 1: A frame for display driving and the touch electrode to the row electrodes digital to analog capacitive touch liquid crystal display 100. The liquid crystal display 100 to display on a glass substrate 110, a glass substrate 120 under the display screen, the row electrodes 111, 121 of column electrodes, the row display driving circuit 130, a column display 140, the touch signal circuit 150, analog switch SPDT group of driver circuits SPST 160 and the analog switch group 170, the control circuit 180 and other components. Particular row electrode 111 is made from both sides are made leading end, and connected to a single pole double throw analog switch group 160 and SPST analog switch group 170. Normal state is a single pole, double throw analog switch group 160 make 111 one end of the row electrode display driving circuit 130 communicates transmit the display driving signals, single-pole, single-throw analog switch group 170 so that the other end of the row electrode 111 is floating; the control circuit 180 so SPDT analog switch group 160 and SPST analog switch group 170 of Scanning manner, one by one so that both ends of the row electrodes of each electrode 111 and 150 simultaneously transmit the touch signal of a touch signal communication circuit, and then returns to a normal end and the display driving circuit 130 is in communication with the other end of the suspended state, so that repeated switching. Each row electrode across the electrodes 111 of the touch signal simultaneously with the timing of the communication circuit 150, the touch signal circuit 150 from both ends of each row electrode to the electrode output current electrode 111, when a human finger touches the touch screen 190, the finger the row electrodes 111 and 190 form a coupling capacitance, the coupling capacitance and the leakage current from flowing, the leakage current flowing to the touch signal circuit 150 exceeds a certain threshold value electrode to test whether the touch, when the number of electrodes exceeding the threshold value is an odd number a touch electrode to the intermediate electrode, when the number of electrodes exceeding the threshold value is even touch position is positioned in the middle of the two electrodes of a touch electrodes to a digital method for determining a direction; touch and then compare two electrodes current flowing to each end of the size of the electrode to the analog method of calculating a touch position of the finger 190 is positioned in the other direction; determining the position of a touch through the touch point locating two orthogonal directions, the liquid crystal display 100 with both for display and touch, eliminating the need for independence of the touch screen.

Bis embodiment of the present invention is also shown in Figure 1: between frames A display driving is performed to row-analog capacitive touch liquid crystal display 100 of the touch electrode to the electrode. The liquid crystal display 100 to display on a glass substrate 110, a glass substrate 120 under the display screen, the row electrodes 111, 121 of column electrodes, the row display driving circuit 130, a column display 140, the touch signal circuit 150, analog switch SPDT group of driver circuits SPST 160 and the analog switch group 170, the control circuit 180 and other components. Particular row electrode 111 is made from both sides are made leading end, and connected to a single pole double throw analog switch group 160 and SPST analog switch group 170. SPDT is a normal state analog switch group 160 so that one end of the row electrodes 111 and the display driving circuit to transmit the display driving signals 130 communication, SPST analog switch group 170 and the other end opened to permit the row electrodes 111 in a floating state; display control circuit 180 when driven between frames, so that the row display driving circuit 130 and the column display driving circuit 140 stops the driving signal for the display screen any display electrode output, but only outputs a zero level signal, only the single pole double throw analog switch group 160 and the single pole single throw analog switch group 170 to sweep the manner described, one by one so that the row electrodes 111 and each of the row electrode display driving circuit 130 is open, and both ends of the electrodes 150 and simultaneously transmit the touch signal of a touch signal communication circuit, and back again to a normal line electrode 111 and one end of the row display driving circuit 130 is in communication with the other end of the floating state. Each row electrode across the electrodes 111 of the touch signal simultaneously with the timing of the communication circuit 150, the touch signal circuit 150 from both ends of each row electrode to the electrode output current electrode 111, when a human finger touches the touch screen 190, the finger the row electrodes 111 and 190 form a coupling capacitance, the coupling capacitance and the leakage current from flowing ,, the leakage current flowing to the touch signal circuit 150 exceeds a certain threshold value electrode to test whether the touch, when the number of electrodes exceeding the threshold value is odd when the touch electrode to the intermediate electrode, when the number of electrodes exceeding the threshold value is even in the middle of the two electrodes of a touch electrode, determining a direction of approach to the digital touch position location; touch electrode and then compare both ends of the electrode current magnitude flowing to the analog method of calculating a touch position of the finger 190 is positioned in the other direction; determining the position of a touch through the touch point locating two orthogonal directions, both the liquid crystal display 100 for display and for touch, eliminating the need for independence of the touch screen.

Three as in the embodiment of the present invention, 2: the number of kind of the row electrodes touch mode electromagnetic passive touch electrode 200 liquid crystal display. On the LCD screen 200 to the glass substrate 210, a glass substrate 220 under the display screen, the row electrodes 211, 221 of column electrodes, the row display driving circuit 230, a column display driving circuit 240, the touch signal circuit 250, analog switch SPDT group SPST 260 and the analog switch group 270, the control circuit 280 and other components. Particular row electrode 211 is made from both sides are made leading end, and connected to the SPDT analog Jian off group 260 and SPST analog switch group 270. SPDT is a normal state analog switch group 260 so that the row electrodes 211- end row display driving circuit 230 and the communication transmit the display driving signals, SPST analog switch group 270 and the other end opened to permit the row electrodes 211 in a floating state; and a control circuit 280 let SPDT analog switch group and SPST analog switch 270 is set 260 of Scanning manner, one by one so that the row electrodes 211 and each of the row electrode display driving circuit 230 is disconnected, and the both ends, respectively, of the touch signal circuit 250 communication transmit touch signals, and then returns to the normal end of the row display driving circuit 230 and the other end of the communication in a floating state, so that repeated switching. Each time both ends of the row electrodes 211 simultaneously communicates with the touch signal circuit 250, the touch signal detection circuit 250 row electrodes 211 at both ends of each of the electromagnetic touch signal electrodes, when the touch pen has an electromagnetic signal transmitting function 290 contact touch screen, the row electrode portion 211 receives the touch signal to an electromagnetic stylus 290 issued to the touch signal circuit 250 detects the touch signal exceeds a certain threshold to test whether the touch, when it exceeds the number of electrodes is odd when the threshold for the touch electrode to the intermediate electrode, when the number of electrodes exceeding the threshold value is even touch position is positioned in the middle of the two electrodes of a touch electrodes to a digital method for determining a direction ; ends and then compare the phase difference detected by the touch electrodes of the touch signal to the analog method of calculating the touch stylus 290 is positioned in a location other direction; two orthogonal directions of the touch position locating the touch points to determine, for both the liquid crystal display 200 and a touch display, the touch screen is no longer necessary independence.

Four as in the embodiment of the present invention shown in FIG. 3: is a number from one or more electrode mode electromagnetic touch the touch electrode active liquid crystal display 300. The liquid crystal display 300 to display on a glass substrate 310, 311 row electrodes, column electrodes 312, 313 pixel display, a display screen, a glass substrate 320, a row display driving circuit 330, a column display driving circuit 340, the touch signal circuit 350, a single pole double-throw analog switch group 360 and SPST analog switch group 370, the control circuit 380 and other components. In particular column electrode 312 is made from both sides are made leading end, and connected to the SPDT analog Jian off group 360 and SPST analog switch group 370. Normal state single pole single pole double throw analog switch group 360 that the end of the column electrodes 312- 340 column display driving circuit to transmit the display driving signal communication, SPST OFF analog switch group 370 the other end 312 of column electrodes in a floating state; in some time point, the control circuit 380 so that the column display driving circuit 340 connected to the single pole double throw analog Jian off group 360 so that the column electrode 312 in each end of the electrode and the column display driving circuit 340 disengaged, while the single-pole double-throw analog switch group 360 and the single pole single throw analog Jian off group 370 so that each of the column electrodes 312 and the electrodes at both ends simultaneously touch signal communication circuit 350 to transmit the touch signal; then return to the normal end of the column display driving circuit 340 is in communication with the other end of the suspended state, so that repeated switching . Touch signal simultaneously with the timing circuit 350 in communication across the electrodes in each row electrode 312, the touch signal circuit 350 to sweep the manner described, one by the touch detection electrode 312 electromagnetic signals across each electrode column, when an electromagnetic signal emission function stylus 390 touches the touch screen, the column electrode portion 312 electrode receiving electromagnetic touch signal emitted by the stylus 390, the touch signal detection circuit 350 to the touch signal exceeds a certain threshold value to test whether the touch, when the number of electrodes exceeding the threshold value is odd intermediate electrode touch electrode, when the number of electrodes exceeding the threshold value is even in the middle of the two electrodes of a touch electrode, is determined by a digital method the touch position of the positioning direction; and then compare the phase difference across the electrodes touch the touch signals are detected, to the analog method of calculating the position of the stylus 390 is positioned in the other direction the touch; the two n the touch position of the touch to determine the cross direction of the anchor point, the liquid crystal display 300 for displaying both a touch and without the need of separate touch screen.

The above-described four embodiments do not represent all possible embodiments, other variations should be the scope of the present invention.

Claims

Claims
1. The digital to analog touch flat panel display, dot matrix flat panel display includes a display screen pixel, the transmission display column electrode scanning signal driving the row electrodes and data signals, characterized in that: the use of a flat panel display screen in a certain direction the touch sensing electrodes as touch sensing electrodes, both ends of the direction of lead-out electrodes were prepared for the end of the touch signal circuit is connected, in a direction perpendicular to the electrode with a digital touch targeting methods, by comparing different sensing electrodes to the difference between the touch signal to determine the position of the touch electrode; targeting analog touch, the touch point is determined by the difference in the two ends of the touch-touch touch signal electrode in a direction parallel to the comparing electrode position on the electrode.
The digital-analog touch flat panel display according to claim 1, wherein an electrode for sensing a direction of the touch, characterized in that: the electrodes of a row direction and the display electrodes An electrode columns. -
The digital-analog touch flat panel display according to claim 1, wherein said electrode lead-out connection end of the touch signal circuit, wherein: a touch screen for detecting electrode is simulated by a number of switch group and display driving circuit and a touch signal circuit is connected to one end of the analog switch and the electrodes or the display driving circuit or a communication circuit communicates with the touch signal, the other end or the floating electrode and the touch signal or communication circuit. .
Many according to claim 3, the one end of each electrode or the display driving circuit or a communication circuit communicates with the touch signal, or the other end of the floating electrode, or communicates with another touch signal circuit analog switch group, wherein: each of the analog Jian Jian off group is at least one scanning and is in the manner of switching operation of switching off simultaneously.
Many claimed in claim 3, the one end of each electrode or the display driving circuit or a communication circuit communicates with the touch signal, or the other end of the floating electrode, or communicates with another touch signal circuit analog switch group, wherein: when the display screen that is part of the communication electrode display driving circuit, the other portion of the electrode group off Jian analog display driving circuit and the switching between the touch signal circuit, display driving is performed in the frame touch signal communication circuit.
Many according to claim 3, the one end of each electrode or the display driving circuit or a communication circuit communicates with the touch signal, or the other end of the floating electrode, or communicates with another touch signal circuit analog switch group, wherein: the switching circuit between the analog switch group and the touch signal in the display driving circuit is driven between the frame display carried out, i.e., the display screen is stopped when any of the output electrode display driving signal, only the communication from the display electrode display driving circuit of the touch signal communication with the steering circuit.
The digital-analog touch flat panel display according to claim 1, wherein the touch signal sensing electrode, wherein: the touch sensing signal is a capacitive manner and the electromagnetic.
According to claim 1 of the digital to analog touch flat panel display, wherein the touch signal sensing electrode, wherein: the touch signal is sensed flow rate signal, the signal amplitude, pulse width signal, at least one frequency signal and the phase signal.
Digital to analog touch screen FPD according to claim 1, wherein the touch signal circuit, wherein: the touch signal is provided within the sense amplifier circuit.
DAC 10. The touch screen FPD according to claim 1, wherein the touch signal circuit, wherein: the touch signal is provided with analog to digital converter circuit.
PCT/CN2006/002983 2005-11-12 2006-11-08 Digital-analog touch control plane display WO2007054018A1 (en)

Priority Applications (2)

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CN200510124471.4 2005-11-12
CN 200510124471 CN1963736B (en) 2005-11-12 2005-11-12 Digifax touch panel display

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