CN101034331A - Touch screen - Google Patents
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- CN101034331A CN101034331A CN 200710007143 CN200710007143A CN101034331A CN 101034331 A CN101034331 A CN 101034331A CN 200710007143 CN200710007143 CN 200710007143 CN 200710007143 A CN200710007143 A CN 200710007143A CN 101034331 A CN101034331 A CN 101034331A
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Abstract
The invention discloses a touch screen, comprising touch detection circuit, sensing electrodes able to be coupled with touch object, and touch detection electrodes connected with the touch detection circuit, where the number of touch detection electrodes is less than that of sensing electrodes, the touch detection electrodes can be coupled with the sensing electrodes, the touch detection circuit is used to detect and compare signals on the touch detection electrodes as touch does not happen and as touch happens. And it can only detect a small number of touch detection electrodes to be able to find the position of the touch object. And it largely reduces requirements for detection technique, and its circuit structure is simple, beneficial to improving the accuracy and reducing the cost and shortening the time for touch locating detection.
Description
Technical field
The present invention relates to a kind of location input equipment, relate in particular to a kind of touch screen.
Background technology
Present capacitance type touch control screen can be divided into numeral and simulation dual mode.Digital capacitive touch screen is made up of every layer of two-layer electrode by many parallel poles, and two-layer electrode is mutually orthogonal.To applying the touch-control pumping signal on each strip electrode, when people's finger contacted touch screen, some electrode on finger and the touch screen formed coupling capacitance, and flows out leakage current from coupling capacitance.The touch-control detection circuit is determined to form two crossed electrodes of coupling capacitance and determine position of touch with finger on the two-layer electrode by detecting leakage current.This kind method only is suitable for thicker location, when requiring careful location, manufacture double-deck fine and closely woven electrode, and cost is too high.And digital capacitive touch screen is when placing the display front, and the reflection that sensing electrode produces can make that again demonstration is inhomogeneous.
Artificial capacitor formula touch screen can be divided into individual layer sensing electrode and double-deck sensing electrode dual mode.The artificial capacitor formula touch screen of individual layer sensing electrode is four angle electrode input touch-control exciting current signals from the planar electrode of individual layer, when people's finger contacts touch screen, finger forms coupling capacitance with electrode, the leakage current that the touch-control pumping signal flows out from coupling capacitance.The touch-control detection circuit calculates the position of touch that flows out electric current from finger by detecting the size that four angles flow to electrode current respectively.This kind method can carefully be located, but the calculated amount of control circuit is big, in environment temperature, when humidity changes, when environment of electric field changes, can cause drift, causes the location inaccurate.Touch screen is when placing the display front, and the incomplete transmission meeting of touch screen sensing electrode reduces brightness of display screen, and the reflection that the touch screen sensing electrode produces can make again under strong ambient light environment and show decrease of contrast.
The artificial capacitor formula touch screen of double-deck sensing electrode is made up of every layer of two-layer electrode by many parallel poles, and two-layer electrode is mutually orthogonal.To applying the touch-control pumping signal on each strip electrode, when people's finger contacts touch screen, some electrode on finger and the touch screen forms coupling capacitance, and from coupling capacitance outflow leakage current, the touch-control detection circuit is by detecting the size that each electrode flows out electric current, calculates laterally on two-layer mutually orthogonal electrode respectively or position of touch longitudinally.This kind method can carefully be located, and drifting problem is also had improvement, but needs to detect leakage current one by one to double-deck sensing electrode, detect and calculated amount big, detect and the calculating required time also becomes big sensing electrode with screen and increases and improve.Touch screen places the display front, and the reflection that the touch screen sensing electrode produces can make that again demonstration is inhomogeneous and showing decrease of contrast under strong ambient light environment.
Publication number be CN1678980A, name be called disclosed in the patent of invention instructions of touch-sensing a kind of with from the electrode of matrix display method, so that matrix display has the ability of sensing touch as touch sensor.But its method is the opposite side that connects the display driver circuit exit from the matrix display electrode, also draw to connect and touch detection circuit, allow the electrodes for display timesharing or with display driver circuit or with touch detection circuit and be communicated with, with the mode of scanning addressing the ranks both direction one by one electrode detector touch, touch as the touch-control electrode senses with electrodes for display.But suggest plans and need allow matrix display all distinguish extension line from the two ends of column electrode and row electrode, different with common electrodes for display Wiring method institute, but need design and make the display screen of this kind sensing touch especially; In addition, this two ends from display column electrode and row electrode all extension line be connected display driver circuit respectively and touch the method for detection circuit too complicated, both increased the weight of cost more reduced reliability; And this mode with the scanning addressing need take considerable time in the ranks both direction method that touches of electrode detector one by one, display frame is produced flash.
Summary of the invention
The present invention is exactly in order to overcome above deficiency, to have proposed a kind of the touch screen that need detect a small amount of electrode.
Technical matters of the present invention is solved by following technical scheme:
A kind of touch screen, comprise the touch-control detection circuit, can with the sensing electrode of touch control object coupling, also comprise the touch detection electrodes that links to each other with the touch-control detection circuit, the quantity of described touch detection electrodes is less than described sensing electrode, described touch detection electrodes can be coupled with sensing electrode, and described touch-control detection circuit is used to detect and when touch-control does not take place and the signal on the touch detection electrodes when touch-control takes place.
Technical matters of the present invention is further solved by following technical scheme:
Described sensing electrode comprises two sensing electrode groups, described sensing electrode group comprises the orthogonal sensing electrode line between group that is parallel to each other in the group, described touch detection electrodes comprises at least two touch detection electrodes lines, described touch-control detection circuit has at least two to intersect with two sensing electrode groups respectively at least one end input touch-control pumping signal of described touch detection electrodes line in the described touch detection electrodes line.
Described sensing electrode comprises at least one sensing electrode group, described sensing electrode group comprises the sensing electrode line that is parallel to each other in the group, described touch detection electrodes comprises at least two touch detection electrodes lines, described touch-control detection circuit is at least one end input touch-control pumping signal of described touch detection electrodes line, has at least two to intersect at the relative both sides of this sensing electrode group respectively with a described sensing electrode group in the described touch detection electrodes line.
Described sensing electrode comprises two sensing electrode groups, described sensing electrode group comprises the orthogonal sensing electrode line between group that is parallel to each other in the group, described touch detection electrodes comprises at least two touch detection electrodes groups, described touch detection electrodes group comprises at least two touch detection electrodes lines, described touch-control detection circuit is to the single-ended input touch-control of described touch detection electrodes line pumping signal, described touch detection electrodes has at least two touch detection electrodes groups to intersect with two groups of sensing electrode lines respectively, has at least two touch detection electrodes lines and a described sensing electrode group to intersect at the relative both sides of this sensing electrode group respectively in each touch detection electrodes group.
Described touch-control detection circuit is imported touch-control pumping signal with same power supplies to sensing electrode to touch detection electrodes input touch-control pumping signal or described touch control object with same power supplies.
Described touch detection electrodes and the sensing electrode place of being coupled are positioned at the touch-control active zone of described touch screen.
Described sensing electrode comprises also and is positioned at the exit that the touch screen edge links to each other with the sensing electrode line that described touch detection electrodes and the sensing electrode place of being coupled are positioned on the exit of described touch screen edge sensing electrode line.
Described sensing electrode group comprises also and is positioned at the outer extraction electrode that links to each other with described sensing electrode line of touch screen that described touch detection electrodes and the sensing electrode place of being coupled are positioned on the described extraction electrode.
Described sensing electrode group also comprises and is positioned at the outer extraction electrode that links to each other with described sensing electrode line of touch screen, described extraction electrode is connected on the printed-wiring board (PWB) or in the electric elements, described touch detection electrodes and the sensing electrode place of being coupled be positioned at described printed-wiring board (PWB) on or be positioned at and described electric elements.
Be coupled by the passive device coupling or by active device between described touch detection electrodes and the sensing electrode, described passive device is at least a in electric capacity, inductance, the resistance.
Between the adjacent coupled point of described touch detection electrodes and sensing electrode is with at least a being connected in electric capacity, inductance, the resistance.
Described sensing electrode line is the row electrode lines that is used for transmitting and displaying driven sweep signal of panel display screen and the row electrode wires that is used for transmission of data signals.
Described touch-control pumping signal and display drive signals timesharing or import described row electrode lines simultaneously into and the row electrode wires in.
Described sensing electrode group also comprises and is positioned at the outer extraction electrode line that links to each other respectively with described row electrode lines and row electrode wires of touch screen, described extraction electrode line is connected in the display driver element, and described touch detection electrodes and the sensing electrode place of being coupled are positioned at described display driver element.
Also comprise the horizontal drive circuit and the column drive circuit that link to each other respectively with row electrode lines and row electrode wires, described horizontal drive circuit and column drive circuit have the common potential tie point, described touch-control detection circuit links to each other with described common potential tie point, described touch detection electrodes comprises the touch detection electrodes group, the extraction electrode line of the touch detection electrodes line of described touch detection electrodes group and row electrode lines or row electrode wires intersects, and described touch-control detection circuit is to the single-ended input touch-control pumping signal of described touch detection electrodes line.
Described column drive circuit comprises odd column driving circuit and even column driving circuit, described touch detection electrodes group comprises odd number touch detection electrodes group and even number touch detection electrodes group, described extraction electrode line comprises odd number extraction electrode line and even number extraction electrode line, described odd column electrode wires links to each other with the odd column driving circuit by odd number extraction electrode line, described even column electrode wires links to each other with the even column driving circuit by even number extraction electrode line, every odd number touch detection electrodes line in the described odd number touch detection electrodes group intersects with odd number extraction electrode line respectively, and every even number touch detection electrodes line in the described even number touch detection electrodes group intersects with even number extraction electrode line respectively.
The beneficial effect that the present invention is compared with the prior art is:
The present invention can just will just can try to achieve the position of touch control object to the minority touch detection electrodes.Touch screen of the present invention is compared with the capacitance type touch control screen of planar electrode, with the plane positioning problem reduction orientation problem that is in line, make that the requirement to detection technique reduces greatly, circuit structure is simple, help improving the precision raising reliability that reduces cost, and shortened the time of touch-control coordinate detection.
Sensing electrode of the present invention can adopt the column electrode that is used for transmitting and displaying driven sweep signal of panel display screen and be used for the row electrode of transmission of data signals, and this can increase touch controllable function easily on existing panel display screen.
And, the position that touch detection electrodes of the present invention and sensing electrode are coupled can be in the touch-control active zone of touch screen or the exit that links to each other with the sensing electrode line with extraction electrode that the sensing electrode line links to each other on or with electric elements that the sensing electrode extraction electrode is connected in or be integrated in display driver element that display screen electrode extraction electrode as sensing electrode is connected in.Like this, can not need change existing panel display screen, get final product and only need outside panel display screen, to increase a spot of detecting electrode line, thereby simplified design proposal, further reduced cost.
Description of drawings
Fig. 1 is the structural representation of the specific embodiment of the invention one;
Fig. 2 is the structural representation of the specific embodiment of the invention two;
Fig. 3 is the structural representation of the specific embodiment of the invention three;
Fig. 4 is the structural representation of the specific embodiment of the invention four;
Fig. 5 is the structural representation of the specific embodiment of the invention five;
Fig. 6 is the structural representation of the specific embodiment of the invention six;
Fig. 7 is the structural representation of the specific embodiment of the invention seven;
Fig. 8 is the structural representation of the specific embodiment of the invention eight;
Fig. 9 is the structural representation of the specific embodiment of the invention nine;
Figure 10 is the structural representation of the specific embodiment of the invention ten;
Figure 11 is the structural representation of the specific embodiment of the invention 11.
Embodiment
Technical thought of the present invention is: at the two ends of even linear impedance line shape electrode with same power supplies input current in wire electrode, when touch control object comes close to or in contact with wire electrode, wire electrode flows out leakage current to touch control object, wire electrode two ends input current is inversely proportional to the contribution of leakage current and the touch point distance apart from the wire electrode two ends, and promptly wire electrode two ends input current is inversely proportional to the distance of touch point apart from the wire electrode two ends.Otherwise, give the wire electrode input current by touch control object, to phase even load output current, the electric current of wire electrode two ends output and touch point are inversely proportional to apart from the distance at wire electrode two ends from the wire electrode two ends.And the present invention utilize can with the sensing electrode of touch control object coupling, with can with the touch detection electrodes of sensing electrode coupling, and make the quantity of touch detection electrodes be less than sensing electrode, as long as the signal on a small amount of touch detection electrodes is detected and analytical calculation, just can try to achieve the position of touch control object.
Embodiment one
The principle of work of above-mentioned touch screen is as follows: at the two ends of the first touch detection electrodes line 110 input touch-control exciting current i11 and i12, and at the two ends of the second touch detection electrodes line 120 input touch-control exciting current i21 and i22, and the size of detection electric current.When touch control object comes close to or in contact with certain strip electrode line 13x in the first sensing electrode group 130, the touch-control exciting current i11 and the i12 of the input of the first touch detection electrodes line, 110 two ends, flow into sensing electrode line 13x by the passive or active coupling 15x between the first touch detection electrodes line 110 and sensing electrode line 13x, determine the position of the sensing electrode line 13x at touch point place to obtain touch point and be parallel to the first touch detection electrodes line 110 by the difference of the first touch detection electrodes line, 110 two ends input current i11 and i12 relatively perpendicular to the position on the first sensing electrode group, the 130 electrode wires directions; Equally, touch control object also comes close to or in contact with certain the strip electrode line 14y in the second sensing electrode group 140 simultaneously, the touch-control exciting current i21 and the i22 of the input of the second touch detection electrodes line, 120 two ends, flow into sensing electrode line 14y by the passive or active coupling 16y between touch detection electrodes line 120 and sensing electrode line 14y, determine the position of the sensing electrode line 14y at touch point place to obtain touch point and be parallel to touch detection electrodes line 120 by the difference of touch detection electrodes line 120 two ends input current i21 and i22 relatively perpendicular to the position on the sensing electrode group 140 electrode wires directions.Thereby obtain the position of touch point on the touch screen plane.
The body line resistance of above-mentioned touch detection electrodes line is more preferably greater than 1K Ω, so that when touch control object comes close to or in contact with touch screen, the difference of the touching signals at touch detection electrodes line two ends is enough big, helps detecting.
Obviously, above-mentioned touch screen also can be provided with the touch detection electrodes line more than two, as long as but have two touch detection electrodes lines to intersect with the first sensing electrode group 130 and the second sensing electrode group 140 respectively.
Embodiment two
The principle of work of above-mentioned touch screen is as follows: at the two ends of the first touch detection electrodes line 210 input touch-control exciting current i11, i12, and at the two ends of the second touch detection electrodes line 220 input touch-control exciting current i21, i22, and the size of detection electric current.When touch control object comes close to or in contact with certain bar sensing electrode line 23x in the sensing electrode group 230, current i 11, the i12 of the input of the first touch detection electrodes line, 210 two ends, flow into sensing electrode line 23x by the passive or active coupling 24x between the first touch detection electrodes line 210 and sensing electrode line 23x, current i 21, the i22 of the input of the second touch detection electrodes line, 220 two ends flow into sensing electrode line 23x by the passive or active coupling 25x between the second touch detection electrodes line 220 and sensing electrode line 23x; By comparing the difference of the first touch detection electrodes line, 210 two ends input current i11 and i12, or determine the position of the sensing electrode line 23x at touch point place to obtain touch point and be parallel to the first touch detection electrodes line 210 and the second touch detection electrodes line 220 perpendicular to the position on the sensing electrode group 230 electrode wires directions by the difference of the second touch detection electrodes line, 220 two ends input current i21 and i22 relatively; The interchange bulk resistor of utilizing sensing electrode group 230 electrode wires to be had, by comparing the difference of the first touch detection electrodes line, 210 1 end input current i11 and the second touch detection electrodes line, 220 same end input current i21, or, obtain touch point and be parallel to position on the sensing electrode group 230 electrode wires directions at the first touch detection electrodes line 210 and the second touch detection electrodes line 220 by the difference of the same end input current i22 of the first touch detection electrodes line, 210 other end input current i12 and the second touch detection electrodes line, 220 other ends relatively.Thereby obtain the position of touch point on the touch screen plane.
The body line resistance of above-mentioned sensing electrode line and touch detection electrodes line is more preferably greater than 1K Ω, so that when touch control object comes close to or in contact with touch screen, the difference of the touching signals at touch detection electrodes line two ends is enough big, helps detecting.
Obviously, above-mentioned touch screen also can be provided with the touch detection electrodes line more than two, as long as but have two touch detection electrodes lines to intersect at the two ends of sensing electrode group 230 respectively with sensing electrode group 230.
Embodiment three
Be coupled with at least a passive device in electric capacity, inductance, the resistance respectively between the described first touch detection electrodes line 311, the second touch detection electrodes line 312 and the first sensing electrode group, 330 each sensing electrode line or active device is coupled, transmit touching signals.Between the adjacent coupled point of the described first touch detection electrodes line 311 and each sensing electrode line of the first sensing electrode group 330 is with at least a being connected in electric capacity, inductance, the resistance; Between the adjacent coupled point of the described second touch detection electrodes line 312 and the first sensing electrode group, 330 each sensing electrode line is with at least a being connected in electric capacity, inductance, the resistance.
Be coupled with at least a passive device in electric capacity, inductance, the resistance respectively between each sensing electrode line of described the 3rd touch detection electrodes line 321, the 4th touch detection electrodes line 322 and the second sensing electrode group 340 or active device is coupled, transmit touching signals.Between the adjacent coupled point of described the 3rd touch detection electrodes line 321 and each sensing electrode line of the second sensing electrode group 340 is with at least a being connected in electric capacity, inductance, the resistance; Between the adjacent coupled point of described the 3rd touch detection electrodes line 321 and each sensing electrode line of the second sensing electrode group 340 is with at least a being connected in electric capacity, inductance, the resistance.
The principle of work of above-mentioned touch screen is as follows: import touch-control exciting current i11, import touch-control exciting current i12 at an end of the second touch detection electrodes line 312 at an end of the first touch detection electrodes line 311, end input touch-control exciting current i21 at the 3rd touch detection electrodes line 321, the one end input touch-control exciting current i22 of the 4th touch detection electrodes line 322, and the size of detection electric current.When touch control object comes close to or in contact with certain strip electrode line 33x in the first sensing electrode group 330, the current i 12 of the current i 11 of the first touch detection electrodes line, 311 inputs and 312 inputs of the second touch detection electrodes line flows into sensing electrode line 33x by passive or active coupling 35x between the first touch detection electrodes line 311 and sensing electrode line 33x and the passive or active coupling 36x between the second touch detection electrodes line 312 and sensing electrode line 33x respectively.The interchange bulk resistor of utilizing sensing electrode group 330 electrode wires to be had, by the difference of the first touch detection electrodes line, 311 input current i11 and the second touch detection electrodes line, 312 input current i12 relatively, obtain touch point in the position that is parallel to perpendicular to the first touch detection electrodes line 311 and the second touch detection electrodes line 312 on the sensing electrode group 330 electrode wires directions.Equally, touch control object also comes close to or in contact with certain the strip electrode line 34y in the second sensing electrode group 340 simultaneously, the current i 22 of the current i 21 of the 3rd touch detection electrodes line 321 inputs and 322 inputs of the 4th touch detection electrodes line flows into sensing electrode line 34y by passive or active coupling 37y between the 3rd touch detection electrodes line 321 and sensing electrode line 34y and the passive or active coupling 38y between the 4th touch detection electrodes line 322 and sensing electrode line 34y respectively.The interchange bulk resistor of utilizing sensing electrode group 340 electrode wires to be had, by the difference of the 3rd touch detection electrodes line 321 input current i21 and the 4th touch detection electrodes line 322 input current i22 relatively, obtain touch point in the position that is parallel to perpendicular to the 3rd touch detection electrodes line 321 and the 4th touch detection electrodes line 322 on the sensing electrode group 340 electrode wires directions; Thereby obtain the position of touch point on the touch screen plane.
The body line resistance of above-mentioned sensing electrode line is more preferably greater than 1K Ω, so that when touch control object comes close to or in contact with touch screen, the difference of the touching signals on the different touch detection electrodes lines is enough big, helps detecting.
Obviously, above-mentioned touch screen also can be provided with the touch detection electrodes group more than two, described touch detection electrodes group comprises more than two touch detection electrodes lines, but described touch detection electrodes has at least two touch detection electrodes groups to intersect with two groups of sensing electrode lines respectively, has at least two two ends that intersect at this sensing electrode group respectively with a described sensing electrode group to get final product in each touch detection electrodes group line.
Be parallel to each other between each sensing electrode line in the above-mentioned sensing electrode group, the distance between each sensing electrode line can equate, also can be not wait.Each touch detection electrodes line and sensing electrode line can be to intersect vertically, and also can arbitrarily angledly intersect.
Touch detection electrodes line and sensing electrode line can be to prepare on the different layers of same substrate, also can be to prepare on different substrate, also can be that preparation is on different separately base materials.
Described touch detection electrodes and the sensing electrode place of being coupled are positioned at the touch-control active zone of described touch screen.
Described sensing electrode comprises also and is positioned at the exit that the touch screen edge links to each other with the sensing electrode line that described touch detection electrodes and the sensing electrode place of being coupled are positioned on the exit of described touch screen edge sensing electrode line.
Described sensing electrode group comprises also and is positioned at the outer extraction electrode that links to each other with described sensing electrode line of touch screen that described touch detection electrodes and the sensing electrode place of being coupled are positioned on the described extraction electrode.
Described sensing electrode group also comprises and is positioned at the outer extraction electrode that links to each other with described sensing electrode line of touch screen, described extraction electrode is connected on the printed-wiring board (PWB), and described touch detection electrodes is positioned on the printed-wiring board (PWB) that links to each other with described extraction electrode with the sensing electrode place of being coupled
The profile that is positioned at the touch detection electrodes line of above-mentioned position can be any wire, the preferred elongated wire.
Described sensing electrode group also comprises and is positioned at the outer extraction electrode that links to each other with described sensing electrode line of touch screen, described extraction electrode is connected in the electric elements, and described touch detection electrodes is positioned at the electric elements that link to each other with described extraction electrode with the sensing electrode place of being coupled.The profile that is positioned at the touch detection electrodes line of electric elements can be arbitrary shape, preferred elongated wire or winding shape, the touch detection electrodes line that is positioned at electric elements also can be no clear and definite shape, but the detection current channel that forms with detecting the electric signal constant transmissions route that the electric current exit is connected, that the detection electric current is flowed through in the electric elements.
The described touch detection electrodes line that intersects with the sensing electrode group can be on an end limit of sensing electrode group many touch detection electrodes lines to be arranged, and also can be on two end limits of sensing electrode group many touch detection electrodes lines to be arranged all; When an end limit in the sensing electrode group has many touch detection electrodes lines to intersect with the sensing electrode line respectively, each touch detection electrodes line can be crossing with different sensing electrode lines respectively, also can be that the crossing respectively sensing electrode line part of different touch detection electrodes lines is identical.
The present invention only needs to be furnished with the sensing electrode group in the Touch Zone of touch screen, utilize that adjoining sensing electrode line is coupled in touch control object and the sensing electrode group, electric signal transmits on the sensing electrode line, by only the touch detection electrodes line electric signal that no matter is in the Touch Zone or outside the Touch Zone or even in the specialist devices being detected and analytical calculation, just can try to achieve the position of touch control object on latticed sensing electrode.
Above-mentioned at touch detection electrodes line two ends input current, relatively the difference of two ends input current is calculated in the scheme of position of touch, intersect coupling along touch detection electrodes pointwise of touch detection electrodes line and sensing electrode, the coupling of touch detection electrodes line and sensing electrode line can be to be coupled with passive devices such as electric capacity, inductance, resistance; Also can be with the active device coupling, analog switch can be directly used in the active device coupling of touch detection electrodes line and sensing electrode line.On the touch detection electrodes line with also can be to be connected between sensing electrode line adjacent coupled point with passive devices such as electric capacity, inductance, resistance.
The detection electric current of importing on the touch detection electrodes line can be the signal with characteristic frequency, also can be the signal with specific coding or further feature, the interference of other signals when detecting electric current to prevent to measure.Detection to touch detection electrodes line input current can be the amplitude that detects input current, it also can be the frequency that detects input current, also can be the phase place that detects input current, also can be the coding that detects input current, also can be the signal that detects the further feature of input current.
Respectively end to each touch detection electrodes line applies the touch-control pumping signal and detects, and can carry out simultaneously, also can not carry out simultaneously.
Described touch control object can adopt finger or pen, when touch control object is lip pencil, can be the metal pen of conduction, also can be with the touch detection electrodes line on the detection electric current imported have the current absorption pen of identical resonance frequency circuit.
Give the sensing electrode input electrical signal by touch control object, termination output electric signal from touch detection electrodes, by comparing the difference of touch detection electrodes output electric signal, can determine that equally touch point is in position on the touch detection electrodes direction or on the sensing electrode direction.
Touch screen generally all is to place before the display and the display collaborative work, and the column electrode of transmission display driver sweep signal and the orthogonal just two arrays of electrodes line of row electrode of data-signal on the common dot matrix type panel display screen, and each row electrode lines in the column electrode all is parallel to each other, each row electrode wires in the row electrode also is parallel to each other, and the present invention utilizes the row electrode lines of panel display screen and row electrode wires touch detection electrodes line and the sensing electrode line as touch screen; Also can only utilize the row electrode lines of panel display screen or row electrode wires sensing electrode line, and the touch detection electrodes line is set in addition specially as touch screen.This just allows panel display screen not increasing under the situation of extra sensing element, not only has Presentation Function, and has touch controllable function, and can avoid additionally being provided with touch screen the display effect of panel display screen is brought influence.When utilizing the panel display screen electrode line as the sensing electrode line of touch screen, the sensing electrode line is connected in the display driver element by extension line, and described touch detection electrodes and the sensing electrode place of being coupled can be integrated in the display driver element.
Below embodiment enumerated the column electrode that adopts panel display screen and row electrode as the sensing electrode line of touch screen, make that panel display screen can simultaneously or timesharing shows and touch-control.The present invention is that example describes with LCD (LCD), obviously is applicable to too to comprise that plasma display (PDP), organic light emitting diode display (OLED) with column electrode and row electrode wait other flat-panel monitors.
Active-matrix liquid crystal display, such as thin film transistor (TFT) (Thin Film Transistor, abbreviation TFT) LCD (TFT-LCD) generally comprises tft array, the display element array that is positioned on the lower baseplate glass, the reading scan electrode that links to each other with the grid of TFT (being column electrode), the shows signal electrode (i.e. row electrode) that links to each other with source electrode or the drain electrode of TFT; Color filter film and the public electrode on glass with being positioned at upper substrate.And the active organic LED display, generally comprise such as thin film transistor (TFT) organic light emitting diode display (TFT-OLED) and to be positioned at upper substrate tft array on glass, display element array, the reading scan electrode that links to each other with the grid of TFT (being column electrode), the shows signal electrode (i.e. row electrode) that links to each other with source electrode or the drain electrode of TFT; With the public electrode that is positioned on the lower baseplate glass.
Embodiment four
As shown in Figure 4, the difference of this embodiment and embodiment is: this embodiment has adopted the column electrode of LCD and row electrode as two sensing electrode groups.
Row analog switch group 441 is connected between column electrode 410 and the horizontal drive circuit 431, and row analog switch group 442 is connected between row electrode 420 and the column drive circuit 432.Control circuit 470 links to each other with row analog switch group 442 with row analog switch group 441 respectively, control circuit 470 can be controlled the break-make of column electrode 410 and row electrode 420 and horizontal drive circuit 431 and column drive circuit 432 by row analog switch group 441 and row analog switch group 442 respectively, makes display 400 or be in to show the time period or be in the touch-control time period.
Described column electrode 410 comprise row electrode lines 411,412 ..., 41M, described row electrode 420 comprise row electrode wires 421,422 ..., 42N.Described column electrode 410 is in respectively on the different base plate glass with row electrode 420.The first touch detection electrodes line 451 and the second touch detection electrodes line 452 are manufactured at the base plate glass different with row electrode 420, promptly manufacture in the end up and down of column electrode 410 residing base plate glass and with row electrode 420 and intersect, and are used to transmit touching signals.The two ends of the first touch detection electrodes line 451 and the second touch detection electrodes line 452 all are connected to touch-control detection circuit 460 respectively.
The principle of work of the LCD of this embodiment is as follows: showing in the time period, control circuit 470 control row analog switch groups 441 and row analog switch group 442 make column electrode 410 and row electrode 420 be communicated with horizontal drive circuit 431 and column drive circuit 432, and display 400 is in normal display state.
At touch-control in the time period, control circuit 470 control row analog switch groups 441 and row analog switch group 442 make column electrode 410 and row electrode 420 disconnect with horizontal drive circuit 431 and column drive circuit 432, column electrode 410 and row electrode 420 become two sensing electrode groups, touch-control detection circuit 460 all applies the touch-control pumping signal of identical voltage characteristic frequency respectively at the first touch detection electrodes line 451 and the second touch detection electrodes line, 452 two ends, and measures the current i 11 that flows into the first touch detection electrodes line, 451 two ends, the current i 21 at i12 and the second touch detection electrodes line, 452 two ends, i22.
When touch control object 480 comes close to or in contact with described LCD 400,420 at touch control object 480 and column electrode 410 and row electrode form coupling capacitance, and the electric current that flows into the first touch detection electrodes line 451 and the second touch detection electrodes line, 452 two ends flows out electric leakage by described coupling capacitance and flows on the touch control object 480.Utilize the bulk resistor of touch detection electrodes line and as the bulk resistor of the column electrode and the row electrode of sensing electrode group, touch control object 480 touches the diverse location of display screen, it is also different to rush down the touch-control pumping signal that spills from touch control object 480, touch-control detection circuit 460 is by surveying the size that the first touch detection electrodes line 451 and the second touch detection electrodes line, 452 two ends touching signals change, the electric current that flows into the first touch detection electrodes line 451 and the second touch detection electrodes line, 452 two ends so that touch-control not to take place is an equilibrium point, obtain inflow first touch detection electrodes line 451 and the second touch detection electrodes line, 452 two ends electric currents information to the leakage current contribution, obtain the distance of touch point with simulated mode apart from same touch detection electrodes two ends, and the distance of two different touch detection electrodes of distance, thereby determine the positional information of touch control object 480 on touch liquid crystal display 400.
Described control circuit 470 can allow LCD 400 constantly change between show state and touch-control state, owing to have only four of two detecting electrode lines to detect the termination, can control the time that at every turn switches to the touch-control state, finish the touch-control of four test sides in time period surveys at each touch-control, also can survey the touching signals of one or several test side in the time period respectively at the touch-control of homogeneous not, and the relaxation of utilization demonstration and the picture phenomenon of human eye, can be under the impregnable situation of the display effect of display 400, but but make display 400 not only display message but also perception touch-control.
Obviously, touch-control detection circuit 460 also can different electrical power be imported the touch-control pumping signal to touch detection electrodes, and for example: the power supply with opposite phase is imported the touch-control pumping signal to touch detection electrodes input touch-control pumping signal or with the power supply of proportional amplitude to touch detection electrodes.
Embodiment five
As shown in Figure 5, the difference of this embodiment and embodiment three is: this embodiment has adopted the column electrode of LCD and row electrode as two sensing electrode groups.And the LCD that this embodiment adopted is an active-matrix liquid crystal display.
Row analog switch group 551 is connected between column electrode 510 and the horizontal drive circuit 541, and row analog switch group 552 is connected between row electrode 520 and the column drive circuit 542.Public electrode 530 links to each other with common electrode driving circuit 543.Control circuit 590 links to each other with row analog switch group 552 with row analog switch group 551 respectively, control circuit 590 can be controlled the break-make of column electrode 510 and row electrode 520 and horizontal drive circuit 541 and column drive circuit 542 by row analog switch group 551 and row analog switch group 552 respectively, makes display 500 or be in to show the time period or be in the touch-control time period.
The first touch detection electrodes line 571, the second touch detection electrodes line 572, the 3rd touch detection electrodes line 561 and the 4th touch detection electrodes line 562 are positioned at the end all around of the base plate glass at column electrode 510, row electrode 520 and tft array place, all isolate between each touch detection electrodes line and between each electrode wires of touch detection electrodes line and column electrode 510 and row electrode 520 with insulation course
The first touch detection electrodes line 571, the second touch detection electrodes line 572 intersect in row electrode 520 two ends and 520 insulation of row electrode respectively, the 3rd touch detection electrodes line 561 and the 4th touch detection electrodes line 562 intersect in column electrode 510 two ends and column electrode 510 insulation respectively, are used to transmit touching signals.The first touch detection electrodes line 571, the second touch detection electrodes line 572, the 3rd touch detection electrodes line 561 and the 4th touch detection electrodes line 562 are all only drawn the test side and are connected to touch-control detection circuit 580 from single-ended.
The principle of work of the LCD of this embodiment is as follows: showing in the time period, control circuit 590 control row analog switch groups 551 and row analog switch group 552 are communicated with column electrode 510 and row electrode 520 respectively with horizontal drive circuit 541 and column drive circuit 542, display 500 is in normal display state.
At touch-control in the time period, control circuit 590 control row analog switch groups 551 and row analog switch group 552 disconnect column electrode 510 and row electrode 520 respectively with horizontal drive circuit 541 and column drive circuit 542, tft array is in closed condition, column electrode 510 and row electrode 520 become two sensing electrode groups, touch-control detection circuit 580 is in the single-ended touch-control pumping signal that all applies identical voltage characteristic frequency respectively of the 3rd touch detection electrodes line 561 and the 4th touch detection electrodes line 562, and measure flowing into the current i 11 of the 3rd touch detection electrodes line 561 and the current i 12 of the 4th touch detection electrodes line 562, the electric current that flows into the 3rd touch detection electrodes line 561 and the 4th touch detection electrodes line 562 when not having touch-control is an equilibrium point.
When touch control object 5100 touches display 500,520 at touch control object 5100 and column electrode 510 and row electrode form coupling capacitance, flow into the first touch detection electrodes line 571, the second touch detection electrodes line 572, the 3rd touch detection electrodes line 561, the electric current of the 4th touch detection electrodes line 562 flows on the touch control object by the capacitive coupling outflow electric leakage of the capacitive coupling between touch detection electrodes line and row-column electrode and row-column electrode and touch control object, press simultaneously and make display screen public electrode 530 close to column electrode 510 and row electrode 520, more the touch-control pumping signal is also rushed down from public electrode 530 again and is spilt.Utilization is as the bulk resistor of the display screen electrode of sensing electrode line, touch control object 5100 touches the diverse location of display screen, it is also different to rush down the touch-control pumping signal that spills from touch control object 5100, touch-control detection circuit 580 is by the 3rd touch detection electrodes line 561, the size that the 4th touch detection electrodes line 562 single-ended touching signals change, flow into the 3rd touch detection electrodes line 561 when not having touch-control, the electric current of the 4th touch detection electrodes line 562 is an equilibrium point, obtain to flow into the 3rd touch detection electrodes line 561, the 4th touch detection electrodes line 562 electric currents obtain touch point apart from the 3rd touch detection electrodes line 561 to the information of leakage current contribution with simulated mode, the distance of the 4th touch detection electrodes line 562.
Touch-control detection circuit 580 is by surveying the size of the first touch detection electrodes line 571, the 572 single-ended touching signals variations of the second touch detection electrodes line, the electric current that flows into the first touch detection electrodes line 571, the second touch detection electrodes line 572 when not having touch-control is an equilibrium point, obtains to flow into the information of the electric current of the first touch detection electrodes line 571, the second touch detection electrodes line 572 to the leakage current contribution; Obtain the distance of touch point with simulated mode apart from the first touch detection electrodes line 571, the second touch detection electrodes line 572; Thereby determine the positional information of touch control object 5100 on touch liquid crystal display 500.
Embodiment six
As shown in Figure 6, this embodiment is with the difference of embodiment two: this embodiment has adopted LCD column electrode and row electrode as two sensing electrode groups.And this embodiment is not by the double break input current of touch-control detection circuit to the touch detection electrodes line, but give the sensing electrode input electrical signal by touch control object, termination output electric signal from touch detection electrodes, by comparing the difference of touch detection electrodes output electric signal, can determine the position of touch point on touch screen by the touch-control detection circuit equally.
Though this embodiment is to adopt timesharing to carry out touch-control and demonstration with embodiment four, five equally, but not to control the break-make of column electrode and row electrode and horizontal drive circuit and column drive circuit respectively by row analog switch group and row analog switch group, make display or be in the demonstration time period or be in the touch-control time period by control circuit.This embodiment utilized dexterously display between display frame, tft array is in these characteristics of closed condition, makes the column electrode of LCD and row electrode become two sensing electrode groups between display frame.
The principle of work of the LCD of this embodiment is as follows: in display frame, horizontal drive circuit 641, column drive circuit 642 output shows signal, column electrode 610 transmitting and displaying driven sweep signals, row electrode 620 transmitting and displaying driving data signals, display 600 is in normal display state.
Between display frame, tft array is in closed condition, column electrode 610 and row electrode 620 become two sensing electrode groups, and touch-control detection circuit 670 is measured current i 11, i12 that flows out from the first touch detection electrodes line, 650 two ends and current i 21, the i22 that flows out from the second touch detection electrodes line, 660 two ends respectively; The electric current that flows out from the first touch detection electrodes line, 650 two ends and the second touch detection electrodes line, 660 two ends when not having touch-control is an equilibrium point, when the pointer 680 with signal generating ability is touched display 600, the electromagnetic wave of pointer 680 emission characteristic frequency touch-control pumping signals is to display screen arrange electrode 620, be coupled on the first touch detection electrodes line 650 and the second touch detection electrodes line 660 from row electrode 620, the touch-control pumping signal flows on the touch-control detection circuit 670 from the first touch detection electrodes line, 650 two ends and the second touch detection electrodes line, 660 two ends again.Because the first touch detection electrodes line 650, the second touch detection electrodes line 660 and have bulk resistor as the row electrode of sensing electrode line, the touch-control pumping signal that flowed out at the first touch detection electrodes line, 650 two ends and the second touch detection electrodes line, 660 two ends when pointer 680 was touched the diverse location of display screen is also different, touch-control detection circuit 670 is by surveying the size that detects the first touch detection electrodes line, 650 two ends and the 660 two ends touching signals variations of the second touch detection electrodes line, the electric current that flows into the first touch detection electrodes line, 650 two ends and the second touch detection electrodes line, 660 two ends when not having touch-control is an equilibrium point, obtain inflow touch detection electrodes line 650 two ends and 660 two ends electric currents information to the leakage current contribution, obtain the distance of touch point with simulated mode, thereby determine the positional information of pointer 680 on LCD 600 apart from display row electrode 620 two-end-points and touch detection electrodes line two-end-point.
Embodiment seven
As shown in Figure 7, this embodiment is with the difference of embodiment one: this embodiment has adopted LCD column electrode and row electrode as two sensing electrode groups.This embodiment is the same with embodiment six, all be utilized dexterously display between display frame, tft array is in these characteristics of closed condition, makes the column electrode of LCD and row electrode become two sensing electrode groups between display frame.
The principle of work of the LCD of this embodiment is as follows: in display frame, 732 pairs of column electrodes 710 of horizontal drive circuit 731 and column drive circuit and row electrode 720 output display drive signals allow display 700 be in normal display state.
Between display frame, tft array is in closed condition, touch-control detection circuit 770 applies the touch-control pumping signal of characteristic frequency respectively to the two ends of the first touch detection electrodes line 750 and the second touch detection electrodes line 760, touching signals is coupled on row electrode 720 each electrode wires by the coupling capacitance of the first touch detection electrodes line 750 with row electrode 720 each intersection point place, touching signals is coupled on column electrode 710 each electrode wires by the coupling capacitance of the second touch detection electrodes line 760 with column electrode 710 each intersection point place, and column electrode 710 and row electrode 720 become two sensing electrode groups; Measure and flow into the first touch detection electrodes line, 750 two ends i11, the current i 21 at i12 and the second touch detection electrodes line, 760 two ends, i22, the electric current that flows into the first touch detection electrodes line, 750 two ends and the second touch detection electrodes line, 760 two ends when not having touch-control is an equilibrium point, when touch control object 780 touches display 700, form coupling capacitance between touch control object 780 and row-column electrode, the electric current that flows into the first touch detection electrodes line, 750 two ends flows on the touch control object by the first touch detection electrodes line 750 and the capacitive coupling of the intersection point of row electrode and the capacitive coupling outflow electric leakage of row electrode and touch control object, capacitive coupling and the capacitive coupling of column electrode and touch control object of the electric current that flows into the second touch detection electrodes line, 760 two ends by the second touch detection electrodes line 760 and the intersection point of column electrode also flows out to leak electricity and flows on the touch control object, press simultaneously and make display screen public electrode 730 close to column electrode 710 and row electrode 720, the touch-control pumping signal is also rushed down more from public electrode 730 and is spilt.
Embodiment eight
As shown in Figure 8, this embodiment is with the difference of embodiment one: this embodiment only needs the touch-control detection circuit that two the single-ended input touch-control of touch detection electrodes line pumping signals are got final product.And this embodiment has adopted the column electrode of LCD and row electrode as two sensing electrode groups.
Utilize the bulk resistor of display screen electrode wires self, column electrode 810 and row electrode 820 can be used as two sensing electrode groups.The first touch detection electrodes line 850 and the second touch detection electrodes line 860 adopt the corpusculum resistance material to make, and described corpusculum resistance material can be metal material.
The principle of work of the LCD of this embodiment is as follows: the first touch detection electrodes line 850 is single-ended to be connected with touch-control detection circuit 870,870 pairs first touch detection electrodes lines 850 of touch-control detection circuit apply the touch-control pumping signal i1 of characteristic frequency, utilize common potential tie point 844 can set up the link circuit of the first touch detection electrodes line 850 and touch-control detection circuit 870, be equivalent to the fixedly current potential of an end of sensing loop.Be that touch-control detection circuit 870 is applied to the touch-control pumping signal on the first touch detection electrodes line 850, be delivered on the column electrode 810 from the first touch detection electrodes line 850, be delivered on row electrode 820 and the public electrode 830 from column electrode 810 again, be delivered to again on horizontal drive circuit and the column drive circuit, be back to touch-control detection circuit 870 by common potential tie point 844 again, form the loop of touch-control pumping signal.
When touch control object 880 touched column electrode 810 as the sensing electrode group, the touch-control pumping signal on the column electrode 810 was by the electromagnetic coupled of touch control object 880 with column electrode 810, and part is rushed down from touch control object 880 and spilt; Press simultaneously and make display screen public electrode 830 close to column electrode 810, the touch-control pumping signal is also rushed down more from public electrode 830 and is spilt; Destroyed as the column electrode 810 of sensing electrode and the Electric Field Distribution on the first touch detection electrodes line 850.Because the column electrode 810 as sensing electrode has bulk resistor, touch control object 880 touches the diverse location of column electrode 810, it is also different to rush down the touch-control pumping signal that spills from touch control object 880, touch-control detection circuit 870 obtains the positional information that touch control object 880 follows electrode 810 electrode wires directions by surveying the size of characteristic frequency on the first touch detection electrodes line 850, particular phases touching signals i1 variation with simulated mode.
Equally, the second touch detection electrodes line 860 is connected with touch-control detection circuit 870,870 pairs second touch detection electrodes lines 860 of touch-control detection circuit apply the touch-control pumping signal i2 of characteristic frequency, utilize common potential tie point 844, set up the link circuit of the second touch detection electrodes line 860 and touch-control detection circuit 870.Be that touch-control detection circuit 870 is applied to the touch-control pumping signal on the second touch detection electrodes line 860, on being delivered to row electrode 820 from the second touch detection electrodes line 860 as the sensing electrode group, be delivered on column electrode 810 and the public electrode 830 from row electrode 820 again, be delivered to again on horizontal drive circuit 841, the column drive circuit 842, be back to touch-control detection circuit 870 by horizontal drive circuit 841, column drive circuit 842 with the common potential tie point 841 of touch-control detection circuit 870 again, form the loop of touch-control pumping signal.
When touch control object 880 touched row electrode 820 as sensing electrode, the touch-control pumping signal on the row electrode 820 was by the electromagnetic coupled of touch control object 880 with row electrode 820, and part is rushed down from touch control object 880 and spilt; Press simultaneously and make display screen public electrode 830 close to row electrode 820, more the touch-control pumping signal is also rushed down from public electrode 830 again and is spilt; Destroyed as the row electrode 820 of sensing electrode and the Electric Field Distribution on the second touch detection electrodes line 860.Because the row electrode 820 as sensing electrode has bulk resistor, touch control object 880 touches the diverse location of row electrode 820, it is also different to rush down the touch-control pumping signal that spills from touch control object 880, touch-control detection circuit 870 obtains the positional information of touch control object 880 along the electrode wires direction of row electrode 820 by surveying the size of characteristic frequency on the second touch detection electrodes line 860, particular phases touching signals i2 variation with simulated mode.
Embodiment nine
As shown in Figure 9, the difference of this embodiment and embodiment five is: this embodiment has adopted the link circuit that utilizes between common potential tie point formation touch detection electrodes line and the touch-control detection circuit, also can comprise two touch detection electrodes groups so that work as touch detection electrodes, when the touch detection electrodes group comprises two touch detection electrodes lines, only need the touch-control detection circuit to the single-ended input touch-control of touch detection electrodes line pumping signal.Also be with the difference of embodiment five: the column drive circuit of this embodiment is divided into first column drive circuit and secondary series driving circuit.
Described horizontal drive circuit 941, first column drive circuit 942, secondary series driving circuit 943, common electrode driving circuit 943 have a common potential tie point 945, and described touch-control detection circuit 970 also links to each other with common potential tie point 945.Described touch-control detection circuit 970 also links to each other with the 4th the single-ended of touch detection electrodes line 962 with the first touch detection electrodes line 951, the second touch detection electrodes line 952, the 3rd touch detection electrodes line 961 respectively, described touch-control detection circuit 970 can be respectively to the single-ended touch-control pumping signal that applies characteristic frequency of above-mentioned touch detection electrodes line.
The first touch detection electrodes line 951 is isolated and is intersected with insulation course with the column electrode 910 as sensing electrode at a side head of column electrode 910, the second touch detection electrodes line 952 is isolated and is intersected with insulation course with the column electrode 910 as sensing electrode in the opposite side termination of column electrode 910, transmits touching signals.The 3rd touch detection electrodes line 961 is isolated and is intersected with insulation course at a side head of row electrode 920 with a part of electrode wires (the row electrode wires of preferred odd number order) as the row electrode 920 of sensing electrode, the 4th touch detection electrodes line 962 is isolated and is intersected with insulation course in the opposite side termination of row electrode 920 with another part electrode wires (the row electrode wires of preferred even number order) as the row electrode 920 of sensing electrode, transmits touching signals.
The principle of work of the LCD of this embodiment is as follows: the first touch detection electrodes line 951 and the single-ended of the second touch detection electrodes line 952 are connected with touch-control detection circuit 970 respectively, touch-control detection circuit 970 applies the touch-control pumping signal i11 and the i12 of characteristic frequency respectively to the first touch detection electrodes line 951 and the second touch detection electrodes line 952, utilize common potential tie point 945 can set up the link circuit of the first touch detection electrodes line 951 and the second touch detection electrodes line 952 and touch-control detection circuit 970, be equivalent to the fixedly current potential of an end of sensing loop.Be that touch-control detection circuit 970 is applied to the touch-control pumping signal on the first touch detection electrodes line 951 and the second touch detection electrodes line 952, on being delivered to electrode wires with its column electrode 910 that intersects respectively from the first touch detection electrodes line 951 and the second touch detection electrodes line 952, be delivered on row electrode 920 and the public electrode 930 from column electrode 910 again, be delivered to horizontal drive circuit 941 again, on the column drive circuit, again by horizontal drive circuit 941, the common potential tie point 945 of column drive circuit and touch-control detection circuit 970 is back to touch-control detection circuit 970, forms the loop of touch-control pumping signal.
When touch control object 980 touched column electrode 910 as sensing electrode, the touch-control pumping signal on the column electrode 910 was by the electromagnetic coupled of touch control object 980 with column electrode 910, and part is rushed down from touch control object 980 and spilt; Press simultaneously and make display screen public electrode 930 close to column electrode 910, more the touch-control pumping signal is also rushed down from public electrode 930 again and is spilt; Destroyed as the column electrode 910 of sensing electrode and the Electric Field Distribution on the first touch detection electrodes line 951 and the second touch detection electrodes line 952.Because the column electrode 910 as sensing electrode has bulk resistor, touch control object 980 touches the diverse location of column electrode 910, it is also different to rush down the touch-control pumping signal that spills from touch control object 980, touch-control detection circuit 970 obtains the positional information that touch control object 980 follows electrode 910 electrode wires directions by surveying respectively and comparing the difference that characteristic frequency, particular phases touching signals i11 and i12 change on the first touch detection electrodes line 951 and the second touch detection electrodes line 952 with simulated mode.
Equally, the 3rd touch detection electrodes line 961 is connected with touch-control detection circuit 970 with the 4th touch detection electrodes line 962, utilize the common potential tie point 941 of horizontal drive circuit 941, column drive circuit 942 and touch-control detection circuit 970, set up the link circuit of the 3rd touch detection electrodes line 961 and the 4th touch detection electrodes line 962 and touch-control detection circuit 970.Be that touch-control detection circuit 970 is applied to touch-control pumping signal i21 and the i22 on the 3rd touch detection electrodes line 961 and the 4th touch detection electrodes line 962 respectively, on being delivered to electrode wires with its row electrode 920 that intersects respectively from the 3rd touch detection electrodes line 961 and the 4th touch detection electrodes line 962, be delivered on column electrode 910 and the public electrode 930 from row electrode 920 again, be delivered to horizontal drive circuit 941 again, on the column drive circuit, again by horizontal drive circuit 941, the common potential tie point 945 of column drive circuit and touch-control detection circuit 970 is back to touch-control detection circuit 970, forms the loop of touch-control pumping signal.
When touch control object 980 touched row electrode 920 as sensing electrode, the touch-control pumping signal on the row electrode 920 was by the electromagnetic coupled of touch control object 980 with row electrode 920, and part is rushed down from touch control object 980 and spilt; Press simultaneously and make display screen public electrode 930 close to row electrode 920, the touch-control pumping signal is also rushed down more from public electrode 930 and is spilt; Destroyed as the row electrode 920 of sensing electrode and the Electric Field Distribution on the 3rd touch detection electrodes line 961 and the 4th touch detection electrodes line 962.Because the row electrode 920 as sensing electrode has bulk resistor, touch control object 980 touches or near the diverse location of row electrode 920, it is also different to rush down the touch-control pumping signal that spills from touch control object 980, touch-control detection circuit 970 obtains the positional information of touch control object 980 along row electrode 920 electrode wires directions by surveying respectively and comparing the difference that characteristic frequency, particular phases touching signals i21 and i22 change on the 3rd touch detection electrodes line 961 and the 4th touch detection electrodes line 962 with simulated mode.
Embodiment ten
As shown in figure 10, this embodiment is with the difference of above-mentioned embodiment: the extraction electrode of touch detection electrodes line and column electrode intersects on the P.e.c. at extraction electrode place in this embodiment, like this, do not need the screen of LCD is done improvement, and only need with P.e.c. that the screen of LCD links to each other on set up some the touch detection electrodes line can make LCD have the function of touch-control.
Described extraction electrode 1050 is connected between described column electrode 1010 and the horizontal drive circuit 1041, a part of row electrode wires in the row electrode 1020 is connected with first column drive circuit 1042, another part row electrode wires in the row electrode 1020 is connected with secondary series driving circuit 1043, and public electrode 1030 is connected with common electrode driving circuit 1044.The row electrode wires of the odd number order in the wherein preferred row electrode 1020 is connected with first column drive circuit 1042, and the row electrode wires of the even number order in the row electrode 1020 is connected with secondary series driving circuit 1043.
Described horizontal drive circuit 1041, first column drive circuit 1042, secondary series driving circuit 1043, common electrode driving circuit 1044 have a common potential tie point 1045, and described touch-control detection circuit 1070 also links to each other with common potential tie point 1045.Each bar touch detection electrodes line in the described touch detection electrodes group is connected with touch-control detection circuit 1070 respectively, and each bar touch detection electrodes line of 1070 pairs of touch detection electrodes groups of touch-control detection circuit applies the touch-control pumping signal of characteristic frequency.
Described extraction electrode 1050 is positioned on the P.e.c., described P.e.c. can be rigid, also can be flexible.Described column electrode 1010 comprises M bar row electrode lines, described row electrode 1020 comprises N bar row electrode wires, described touch detection electrodes group comprises L (the bar touch detection electrodes line of L＜M), these touch detection electrodes lines also are positioned on the P.e.c. at extraction electrode 1050 places that link to each other with column electrode 1010, every touch detection electrodes line of touch detection electrodes group intersects with the extraction electrode line insulation of the specific quantity of extraction electrode 1050 respectively, transmits touching signals.Described L bar touch detection electrodes line can cover all extraction electrode lines of extraction electrode 1050 substantially.
The principle of work of the LCD of this embodiment is as follows: the common potential tie point 1045 that utilizes horizontal drive circuit 1041, column drive circuit and touch-control detection circuit 1070, set up the link circuit of touch detection electrodes group and touch-control detection circuit 1070, be equivalent to the fixedly current potential of an end of sensing loop.Be that touch-control detection circuit 1070 is applied to the touch-control pumping signal on each bar touch detection electrodes line of touch detection electrodes group, on being delivered to extraction electrode line with its extraction electrode 1050 that intersects respectively from each bar touch detection electrodes line of touch detection electrodes group, be delivered on the row electrode lines of column electrode 1010 from the extraction electrode line again, be delivered to again on the row electrode wires of row electrode 1020, be delivered to horizontal drive circuit 1041 again, on the column drive circuit, again by horizontal drive circuit 1041, the common potential tie point 1045 of column drive circuit and touch-control detection circuit 1070 is back to touch-control detection circuit 1070, forms the loop of touch-control pumping signal.
When touch control object 1080 touched column electrode 1010 as sensing electrode, the touch-control pumping signal of column electrode 1010 was by the electromagnetic coupled of touch control object 1080 with column electrode 1010, and part is rushed down from touch control object 1080 and spilt; Press simultaneously and make display screen public electrode 1030 close to column electrode 1010, the touch-control pumping signal is also rushed down more from public electrode 1030 and is spilt; Destroyed as the column electrode 1010 of sensing electrode group and the Electric Field Distribution on each bar touch detection electrodes line of touch detection electrodes group.Because have bulk resistor as the column electrode 1010 of sensing electrode group, touch control object 1080 touches the diverse location of column electrode 1010, it is also different to rush down the touch-control pumping signal that spills from touch control object 1080; Touch-control detection circuit 1070 is by comparing the variation of characteristic frequency touching signals on each bar touch detection electrodes line of touch detection electrodes group, obtain the position of the row electrode lines of touch control object 1080 touchings with digital mode, promptly obtain positional information perpendicular to column electrode 1010 electrode wires directions with digital mode.
Touch-control detection circuit 1070 by surveying the size that the characteristic frequency touching signals changes on the corresponding touch detection electrodes line in the touch detection electrodes group, obtains the positional information of touch control object 1080 in the row electrode lines direction that follows electrode 1010 with simulated mode again.
So just can obtain the positional information of touch control object 1080 on touch control type flat-panel display 1000 in the mode that numeral and simulation combine.Because the touching signals of 1070 characteristic frequency that himself is sent of touch-control detection circuit, particular phases detects, display drive signals can't influence touch-control and survey; And the frequency of the characteristic frequency touching signals that touch-control detection circuit 1070 sends is when enough high, and touching signals can not influence demonstration yet.
Every touch detection electrodes line can be set to intersect according to the extraction electrode line of certain intervals and extraction electrode 1050 respectively.
Touch detection electrodes lines different in the described L bar touch detection electrodes line can be crossing with different extraction electrode lines respectively.Preferred M is the multiple of L, promptly every touch detection electrodes line can be identical with quantity respectively, adjacent extraction electrode line intersects.For example: the first touch detection electrodes line and first and second extraction electrode line intersect, and the second touch detection electrodes line and third and fourth extraction electrode line intersect ..., L touch detection electrodes line and M-1, M extraction electrode line intersect.
It is identical extraction electrode line that the extraction electrode line that different touch detection electrodes lines intersects respectively in the described L bar touch detection electrodes line also can have part.
Obviously, extraction electrode also can be arranged between column drive circuit and the row electrode.
Embodiment 11
As shown in figure 11, the difference of this embodiment and embodiment ten is: the even number touch detection electrodes group that the touch detection electrodes group of this embodiment comprises odd number touch detection electrodes group that the odd number extraction electrode with the row electrode intersects, intersects with the even number extraction electrode of row electrode.
Described horizontal drive circuit 1141, odd column driving circuit 1142, even column driving circuit 1143, common electrode driving circuit 1144 have a common potential tie point 1145, and described touch-control detection circuit 1170 also links to each other with common potential tie point 1145.Each bar touch detection electrodes line in the described touch detection electrodes group is connected with the single-ended of touch-control detection circuit 1170 respectively, and each bar touch detection electrodes line of 1170 pairs of touch detection electrodes groups of touch-control detection circuit applies the touch-control pumping signal of characteristic frequency.
Described extraction electrode is positioned on the P.e.c., described P.e.c. can be rigid, also can be flexible.Every odd number touch detection electrodes line 1161,1163 in the odd number touch detection electrodes group ..., 116N-1 intersects with each bar extraction electrode line insulation of odd column extraction electrode 1151 respectively, transmit touching signals, every even number touch detection electrodes line 1162,1164 in the even number touch detection electrodes group ..., 116N intersects with each bar extraction electrode line insulation of even column extraction electrode 1152 respectively, transmit touching signals, these touch detection electrodes lines can adopt metal material to make.Described odd number detecting electrode line is positioned on the odd column extraction electrode 1151 residing P.e.c., and described even number detecting electrode line is positioned on the even column extraction electrode 1152 residing P.e.c..
The principle of work of the LCD of this embodiment is as follows: the common potential tie point 1145 that utilizes horizontal drive circuit 1141, column drive circuit and touch-control detection circuit 1170, set up each the bar touch detection electrodes line in the touch detection electrodes group and the link circuit of touch-control detection circuit 1170, be equivalent to the fixedly current potential of an end of sensing loop.Be that touch-control detection circuit 1170 is applied to the touch-control pumping signal on detecting electrode group 1160 each bar detecting electrode line, on being delivered to extraction electrode line with its extraction electrode that intersects respectively from each bar detecting electrode line of detecting electrode group, be delivered on the electrode wires of row electrode from the extraction electrode line again, row electrode wires from row electrode 1120 is delivered on the row electrode lines of column electrode 1110 again, be delivered to again on horizontal drive circuit 1140 and the column drive circuit, common potential tie point 1145 by horizontal drive circuit 1140 and column drive circuit and touch-control detection circuit 1170 is back to touch-control detection circuit 1170 again, forms the loop of touch-control pumping signal.
In display frame, display driver circuit output shows signal, column electrode 1110 transmitting and displaying driven sweep signals, row electrode 1120 transmitting and displaying driving data signals, display 1100 is in normal display state.
Between display frame, tft array is in closed condition, row electrode 1120 becomes a touch-control sensing electrode group, touch-control detection circuit 1170 applies the touch-control pumping signal of characteristic frequency respectively to each bar touch detection electrodes line of touch detection electrodes group, and measures the electric current that flows into each bar touch detection electrodes line; When touch control object 1180 touched as row electrode 1120, the touch-control pumping signal on the row electrode 1120 was by the electromagnetic coupled of touch control object 1180 with row electrode 1120, and part lets out from touch control object 1180; Press simultaneously and make display screen public electrode 1130 close to row electrode 1120, the touch-control pumping signal also from public electrode 1130 more Vent spill; Destroyed as the Electric Field Distribution on each bar detecting electrode line on the row electrode 1120 of sensing electrode group and the detecting electrode group.
Because the row electrode 1120 as sensing electrode has bulk resistor, touch control object 1180 touches the diverse location of row electrode 1120, and the touch-control pumping signal that spills from touch control object 1180 Vent is also different; Touch-control detection circuit 1170 is by comparing the variation of touching signals on each bar detecting electrode line in the detecting electrode group, obtain the position of the row electrode wires of touch control object 1180 touchings with digital mode, promptly obtain perpendicular to positional information as the row electrode 1120 electrode wires directions of sensing electrode with digital mode.
Touch-control detection circuit 1170 obtains the positional information of touch control object 1180 along row electrode 1120 electrode wires directions by comparing the difference of touching signals on adjacent odd number detecting electrode line of detecting electrode group and the even number detecting electrode line with simulated mode.
Obviously, can between same display frame, finish detection to each bar touch detection electrodes line, also can between the display frame of homogeneous not, survey the touching signals of different touch detection electrodes lines respectively, under the impregnable situation of the display effect of display 1100, but but make display 1100 not only display message but also perception touch-control.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (16)
1, a kind of touch screen, comprise the touch-control detection circuit, can with the sensing electrode of touch control object coupling, it is characterized in that:
Also comprise the touch detection electrodes that links to each other with the touch-control detection circuit, the quantity of described touch detection electrodes is less than described sensing electrode, described touch detection electrodes can be coupled with sensing electrode, and described touch-control detection circuit is used to detect and when touch-control does not take place and the signal on the touch detection electrodes when touch-control takes place.
2, touch screen according to claim 1 is characterized in that:
Described sensing electrode comprises two sensing electrode groups, described sensing electrode group comprise in the group be parallel to each other, organize between orthogonal sensing electrode line, described touch detection electrodes comprises at least two touch detection electrodes lines, described touch-control detection circuit has at least two to intersect with two sensing electrode groups respectively at least one end input touch-control pumping signal of described touch detection electrodes line in the described touch detection electrodes line.
3, touch screen according to claim 1 is characterized in that:
Described sensing electrode comprises at least one sensing electrode group, described sensing electrode group comprises the sensing electrode line that is parallel to each other in the group, described touch detection electrodes comprises at least two touch detection electrodes lines, described touch-control detection circuit is at least one end input touch-control pumping signal of described touch detection electrodes line, has at least two to intersect at the relative both sides of this sensing electrode group respectively with a described sensing electrode group in the described touch detection electrodes line.
4, touch screen according to claim 1 is characterized in that:
Described sensing electrode comprises two sensing electrode groups, described sensing electrode group comprises in the group and being parallel to each other, orthogonal sensing electrode line between group, described touch detection electrodes comprises at least two touch detection electrodes groups, described touch detection electrodes group comprises at least two touch detection electrodes lines, described touch-control detection circuit is to the single-ended input touch-control of described touch detection electrodes line pumping signal, described touch detection electrodes has at least two touch detection electrodes groups to intersect with two groups of sensing electrode lines respectively, has at least two touch detection electrodes lines and a described sensing electrode group to intersect at the relative both sides of this sensing electrode group respectively in each touch detection electrodes group.
5, according to each described touch screen in the claim 1 to 4, it is characterized in that:
Described touch-control detection circuit is imported touch-control pumping signal with same power supplies to sensing electrode to touch detection electrodes input touch-control pumping signal or described touch control object with same power supplies.
6, according to each described touch screen in the claim 2 to 4, it is characterized in that:
Described touch detection electrodes and the sensing electrode place of being coupled are positioned at the touch-control active zone of described touch screen.
7, according to each described touch screen in the claim 2 to 4, it is characterized in that:
Described sensing electrode comprises also and is positioned at the exit that the touch screen edge links to each other with the sensing electrode line that described touch detection electrodes and the sensing electrode place of being coupled are positioned on the exit of described touch screen edge sensing electrode line.
8, according to each described touch screen in the claim 2 to 4, it is characterized in that:
Described sensing electrode group comprises also and is positioned at the outer extraction electrode that links to each other with described sensing electrode line of touch screen that described touch detection electrodes and the sensing electrode place of being coupled are positioned on the described extraction electrode.
9, according to each described touch screen in the claim 2 to 4, it is characterized in that:
Described sensing electrode group also comprises and is positioned at the outer extraction electrode that links to each other with described sensing electrode line of touch screen, described extraction electrode is connected on the printed-wiring board (PWB) or in the electric elements, described touch detection electrodes and the sensing electrode place of being coupled be positioned at described printed-wiring board (PWB) on or be positioned at and described electric elements.
10, according to each described touch screen in the claim 1 to 4, it is characterized in that:
Be coupled by the passive device coupling or by active device between described touch detection electrodes and the sensing electrode, described passive device is at least a in electric capacity, inductance, the resistance.
11, according to each described touch screen in the claim 1 to 4, it is characterized in that:
Between the adjacent coupled point of described touch detection electrodes and sensing electrode is with at least a being connected in electric capacity, inductance, the resistance.
12, according to each described touch screen in the claim 1 to 4, it is characterized in that:
Described sensing electrode line is the row electrode lines that is used for transmitting and displaying driven sweep signal of panel display screen and the row electrode wires that is used for transmission of data signals.
13, touch screen according to claim 12 is characterized in that:
Described touch-control pumping signal and display drive signals timesharing or import described row electrode lines simultaneously into and the row electrode wires in.
14, touch screen according to claim 12 is characterized in that:
Described sensing electrode group also comprises and is positioned at the outer extraction electrode line that links to each other respectively with described row electrode lines and row electrode wires of touch screen, described extraction electrode line is connected in the display driver element, and described touch detection electrodes and the sensing electrode place of being coupled are positioned at described display driver element.
15, touch screen according to claim 12 is characterized in that:
Also comprise the horizontal drive circuit and the column drive circuit that link to each other respectively with row electrode lines and row electrode wires, described horizontal drive circuit and column drive circuit have the common potential tie point, described touch-control detection circuit links to each other with described common potential tie point, described touch detection electrodes comprises the touch detection electrodes group, the extraction electrode line of the touch detection electrodes line of described touch detection electrodes group and row electrode lines or row electrode wires intersects, and described touch-control detection circuit is to the single-ended input touch-control pumping signal of described touch detection electrodes line.
16, touch screen according to claim 15 is characterized in that:
Described column drive circuit comprises odd column driving circuit and even column driving circuit, described touch detection electrodes group comprises odd number touch detection electrodes group and even number touch detection electrodes group, described extraction electrode line comprises odd number extraction electrode line and even number extraction electrode line, described odd column electrode wires links to each other with the odd column driving circuit by odd number extraction electrode line, described even column electrode wires links to each other with the even column driving circuit by even number extraction electrode line, every odd number touch detection electrodes line in the described odd number touch detection electrodes group intersects with odd number extraction electrode line respectively, and every even number touch detection electrodes line in the described even number touch detection electrodes group intersects with even number extraction electrode line respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100071435A CN101034331B (en) | 2006-02-13 | 2007-02-02 | Capacitor type touch screen |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610054806 | 2006-02-13 | ||
| CN200610054806.4 | 2006-02-13 | ||
| CN2007100071435A CN101034331B (en) | 2006-02-13 | 2007-02-02 | Capacitor type touch screen |
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| CN101034331A true CN101034331A (en) | 2007-09-12 |
| CN101034331B CN101034331B (en) | 2011-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100071435A Expired - Fee Related CN101034331B (en) | 2006-02-13 | 2007-02-02 | Capacitor type touch screen |
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| CN (1) | CN101034331B (en) |
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