CN1916712A - Touch controlled type liquid crystal display - Google Patents
Touch controlled type liquid crystal display Download PDFInfo
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- CN1916712A CN1916712A CN 200610153692 CN200610153692A CN1916712A CN 1916712 A CN1916712 A CN 1916712A CN 200610153692 CN200610153692 CN 200610153692 CN 200610153692 A CN200610153692 A CN 200610153692A CN 1916712 A CN1916712 A CN 1916712A
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Abstract
A liquid crystal display of touch control type consists of actuator of source electrode, actuator of grid, multiple pixel units multiple detection circuit and judgment unit. It is featured as conducting fixed voltage to sensing unit when the first transistor of detection circuit is switched on, generating dynamic voltage by sensing unit and making the second transistor generate dynamic current when it is switched off, conducting said current to judgment unit when the third transistor of detection circuit is switched on and using judgment unit to compare dynamic currents outputted by multiple detection circuit in order to judge out detection circuit positions of multiple detection circuit.
Description
Technical field
The present invention relates to a kind of LCD, particularly a kind of touch-control liquid crystal display.
Background technology
Function advanced person's display gradually becomes the valuable feature of consumption electronic product now, and wherein LCD has become the display that various electronic equipments such as TV, mobile phone, personal digital assistant (PDA), digital still camera, computer screen or the widespread use of mobile computer screen institute have the high-res color/graphics gradually.
Because LCD is carried for convenience and used now, the touch-control liquid crystal display panel that the user can directly touch also becomes the direction of the market development.Resistance-type traditionally or capacitance touching control display panels, it is provided with extra resistance capacitance element on panel, and judges the location coordinate that presses by the variation that detects the touch point magnitude of voltage.Yet, owing to elements such as resistance capacitance are set directly on the panel, thus can cause the light penetration rate of display panels to descend, and increase the integral thickness of panel.Another kind of optical touch control panel then is that a large amount of light sources and corresponding optics sensing element are set around display panels, and the light that utilizes the optics sensing element whether to detect corresponding light source is judged the location coordinate of touch point.Though such design is unlikely to reduce the light penetration rate of panel, can increase considerably the volume of product, therefore be not suitable for the demand of general Portable LCD yet.
Therefore if sensing element can be integrated among the liquid crystal panel, not only LCD overall weight and volume can be reduced, the lcd products of thin design will be helped stressing now.
Summary of the invention
The object of the present invention is to provide a kind of touch-control liquid crystal display, directly touch control LCD (Liquid Crystal Display) panel and detect ad-hoc location.
One embodiment of the invention provide a kind of LCD, and it comprises one source pole driver, a gate drivers, a plurality of pixel cell, a plurality of testing circuit and a judging unit.This source electrode driver is used for producing a voltage data signal.This gate drivers is used for producing the one scan signal.These a plurality of pixel cells are arranged, and each pixel cell comprises a switching transistor, is used for when this sweep signal is opened this switching transistor this voltage data signal of conducting, and a liquid crystal capacitance, be used for adjusting the arrangement of liquid crystal molecule according to this voltage data signal.Each testing circuit is electrically connected on a pixel cell of these a plurality of pixel cells, and each testing circuit comprises a first transistor, a sensing cell, a transistor seconds and one the 3rd transistor.This first transistor is used for when a control signal voltage is opened this first transistor, conducting one fixed voltage.This sensing cell is coupled to this first transistor, is used for producing a dynamic electric voltage when this first transistor is closed.This transistor seconds is coupled to this sensing cell, is used for producing a dynamic current according to this dynamic electric voltage.The 3rd transistor is coupled to this transistor seconds, is used for when the 3rd transistor is opened this dynamic current of conducting.This judging unit is coupled to the 3rd transistor, is used for relatively the dynamic current of these a plurality of testing circuits outputs to judge the source of this dynamic current.
Another embodiment of the present invention provides a kind of LCD, and it comprises that it comprises one source pole driver, a gate drivers, a plurality of testing circuit and a judging unit.This source electrode driver is used for producing a voltage data signal.This gate drivers is used for producing the one scan signal.These a plurality of pixel cells are arranged, each pixel cell comprises a switching transistor, be used for when this sweep signal is opened this switching transistor, this voltage data signal of conducting and a liquid crystal capacitance are used for adjusting according to this voltage data signal the arrangement of liquid crystal molecule.Each testing circuit is electrically connected on a pixel cell of these a plurality of pixel cells, and this each testing circuit comprises a first transistor, a transistor seconds and a sensing cell.This first transistor couples a fixed voltage end, is used for when a control signal voltage is opened this first transistor, certainly this fixed voltage end conducting one fixed voltage.This sensing cell is coupled to this first transistor, is used for producing a dynamic electric voltage.This transistor seconds is coupled to this sensing cell, is used for producing a dynamic current according to this dynamic electric voltage when this transistor seconds is opened.This judging unit is coupled to this a plurality of testing circuits, is used for relatively the dynamic current of these a plurality of testing circuits outputs to judge the source of this dynamic current.
Another embodiment of the present invention provides a kind of LCD, and it comprises one source pole driver, a gate drivers, a plurality of testing circuit and a judging unit.This source electrode driver is used for producing a voltage data signal.This gate drivers is used for producing the one scan signal.These a plurality of pixel cells are arranged, each pixel cell comprises a switching transistor, be used for when this sweep signal is opened this switching transistor, this voltage data signal of conducting and a liquid crystal capacitance are used for adjusting according to this voltage data signal the arrangement of liquid crystal molecule.Each testing circuit is electrically connected on a pixel cell of these a plurality of pixel cells, and this each testing circuit comprises a sensing cell, a transistor and a change-over circuit.This sensing cell is used for producing a dynamic electric voltage.This transistor is used for producing a dynamic current according to this dynamic electric voltage when a control signal voltage is opened this transistor.It is a judgement voltage signal that this change-over circuit is used for changing this dynamic current.This judging unit is used for relatively the judgement voltage signal of these a plurality of testing circuits outputs to judge the source of this dynamic current.
Description of drawings
Fig. 1 is the synoptic diagram of LCD of the present invention.
Fig. 2 is the partial circuit diagram of first embodiment of the display panels of Fig. 1.
Fig. 3 is the synoptic diagram of sensing cell when stressed of the embodiment of Fig. 2.
Fig. 4 is that the touch control capacitance of Fig. 3 is at the voltage of different time and the graph of a relation of capacitance.
Fig. 5 is the sequential chart of each signal wire of Fig. 2.
Fig. 6 represents the graph of a relation of conducting electric current I ds and voltage Vg.
Fig. 7 is the circuit block diagram of the judging unit of Fig. 2.
Fig. 8 is the partial circuit diagram of second embodiment of the display panels of Fig. 1.
Fig. 9 is the sequential chart of each signal wire of Fig. 8.
Figure 10 is the partial circuit diagram of the display panels of the third embodiment of the present invention.
Figure 11 is the sequential chart of each signal wire of Figure 10.
The reference numeral explanation
100,300 LCD, 102 gate drivers
104 source electrode drivers, 106 voltages are replied the unit
108 judging units, 110 display panels
200 pixel cells, 202 switching transistors
204 storage capacitors, 206 liquid crystal capacitances
211,311 the first transistors, 212,312 transistor secondses
213 the 3rd transistors, 210 testing circuits
250,252 conducting glass substrates, 1082,412 integrating circuit
1084 analog/digital converters, 1086 decision unit
1088,416 switch elements, 411 transistors
414 operational amplifiers, 421,422 input ends
423 output terminal Cv touch control capacitances
Gn sweep trace Vcom common-battery pressure side
Dn data line Rn, Bn transmission line
Embodiment
See also Fig. 1, Fig. 1 is the synoptic diagram of LCD 100 of the present invention.LCD 100 comprises a gate drivers 102, one source pole driver 104, a fixed voltage unit 106, a judging unit 108 and a display panels 110.Gate drivers 102 is used for producing the one scan signal, and by sweep trace G
1-G
NBe sent to display panels 110.Source electrode driver 104 is used for producing a voltage data signal, and by data line D
1-D
MBe sent to display panels 110.Fixed voltage unit 106 is by transmission line R
1-R
PTransmit a fixed voltage to display panels 110.Fixed voltage unit 106 is used for producing a fixed voltage.108 of judging units pass through transmission line B
1-B
QBe coupled to display panels 110, and be used for detecting the touched position of display panels 110.
See also Fig. 2, Fig. 2 is the partial circuit diagram of first embodiment of the display panels 110 of Fig. 1.Display panels 110 comprises a plurality of pixel cells 200 and a plurality of testing circuit 210.Each testing circuit 210 is coupled to a pixel cell 200.What need pay special attention to is that the number of testing circuit 210 can be less than or equal the number of pixel cell 200, and a plurality of testing circuit 210 is evenly distributed on the display panels 110.Each pixel cell 200 comprises a switching transistor 202, a storage capacitors 204 and a liquid crystal capacitance 206.Liquid crystal capacitance 206 is made up of two electrodes, and an electrode is connected to voltage end Vcom altogether, and another electrode then is connected between switching transistor 202, two electrodes and is distributed with liquid crystal molecule.When the grid of switching transistor 202 receives sweep trace G
N-1When transmitting the sweep signal of gate drivers 102 generations, can give liquid crystal capacitance 206 by the voltage data signal that source electrode driver 104 produces via data line Dn conducting.The common-battery that the liquid crystal molecule of liquid crystal capacitance 206 then produces according to common-battery pressure side Vcom is pressed and the voltage difference of voltage data signal produces different orientations, with the light intensity of control by liquid crystal molecule.Storage capacitors 204 then is used for storing this voltage data signal, make liquid crystal capacitance 206 when switching transistor 202 cuts out, still can keep this voltage data signal voltage difference between the voltage together, comprise a first transistor 211, a transistor seconds 212, one the 3rd transistor 213 and a sensing cell and make light intensity by liquid crystal molecule be maintained fixed testing circuit 210.Sensing cell is used for producing a dynamic electric voltage in node Y in a specific period, therefore in the present embodiment, sensing cell can be a touch control capacitance Cv, its principle is in this specific period, according to the capacitance dynamic change of touch control capacitance Cv, making touch control capacitance Cv export node Y to is a dynamic electric voltage.
See also Fig. 2, Fig. 3 and Fig. 4, Fig. 3 is the synoptic diagram of sensing cell when stressed of the embodiment of Fig. 2, and Fig. 4 is that the touch control capacitance of Fig. 3 is at the voltage of different time and the graph of a relation of capacitance.As mentioned above, sensing cell can be a touch control capacitance Cv, and in the present embodiment, touch control capacitance Cv is formed on the display panels 110, that is to say, forms touch control capacitance Cv on two conducting glass substrates 250,252 of display panels 110.The end of touch control capacitance Cv is electrically connected on the first transistor 211 (that is node Y), and the other end then is electrically connected on a fixed voltage end, in order to fixed voltage to be provided.In the present embodiment, this fixed voltage end can together use common-battery pressure side Vcom with liquid crystal capacitance 206.For instance, when time point t1, display panels 110 is not touched, and the voltage difference that puts on two conducting glass substrates 250,252 is 10 volts, and this moment, the two distance between electrodes d of touch control capacitance Cv were 3 μ m, and capacitance is 0.41pf.When time point t2, when the user with the finger or pointer applies an external force A in conducting glass substrate 250, touch control capacitance Cv two distance between electrodes d can be reduced into 2 μ m, and the arrangement of the liquid crystal molecule between touch control capacitance Cv two electrodes also can change.Because the capacitance of touch control capacitance Cv is inversely proportional to apart from d and relevant with the arrangement of liquid crystal molecule, be 0.52pf so can increase at the capacitance of time point t2.At the same time, because the charge Q that touch control capacitance Cv stores is a fixed value, be 8.2 volts (8.2 * 0.5=10 * 0.41) so the voltage difference of two conducting glass substrates 250,252 can diminish.By the time during time point t3, external force A disappears, thus two conducting glass substrates 250,252 return to 3 μ m again apart from d, capacitance reverts to 0.41pf at this moment, and the voltage difference of two conducting glass substrates 250,252 also becomes 10 volts.
See also Fig. 2 and Fig. 5, Fig. 5 is the sequential chart of each signal wire of Fig. 2.When time point T0, the sweep signal that gate drivers 102 produces is opened switching transistor 202 via sweep trace Gn-1, and at this moment, the voltage data signal that source electrode driver 104 produces can be sent to liquid crystal capacitance 206 by data line Dn and via switching transistor 202.When time point T1, the sweep signal sweep trace Gn that gate drivers 102 produces opens the first transistor 211 via switching transistor 202, and this moment, transmission line Rn can be sent to node Y via the first transistor 211 with a fixed voltage (10V).Touch control capacitance Cv this moment (that is sensing cell) can store fixed voltage, and makes the voltage Vy of node Y keep 10V to be scanned the sweep signal that line Gn transmits once again up to the first transistor 211 next time and to open.Between period T2-T3,,, make transistor seconds 212 to produce an electric current I ds according to voltage Vy so fixed voltage can be opened transistor seconds 212 because the grid of transistor seconds 212 is electrically connected on node Y.By equation 1 as can be known:
Wherein, K is a constant, V
ThBe transistorized limit voltage, V
gBe transistorized grid voltage, V
dBe transistor drain voltage.When time point T2, the sweep signal that gate drivers 102 produces is not only opened switching transistor 202 via sweep trace Gn-1, also open the 3rd transistor 213 simultaneously, this moment, the grid voltage (that is voltage of node Y) of transistor seconds 212 was 10V, the drain voltage of transistor seconds 212 is that the common-battery that common-battery pressure side Vcom provides is pressed, event electric current I ds can keep a fixed value, and electric current I ds conducting can be received by judging unit 108 to transmission line Bn via the 3rd transistor of opening 213.
When time point T3, the sweep signal of sweep trace Gn is opened the first transistor 211 once again, and the fixed voltage that the voltage of node Y is provided according to fixed voltage unit 106 and maintain 10V.When time point T4, as described in Fig. 3 and Fig. 4, touch control capacitance Cv causes its electric capacity to increase because of an external force, and then makes the voltage Vy of node Y descend.At this moment, the conducting electric current I ds of transistor seconds 212 can be because voltage Vy descends descend (please refer to equation 1).As shown in Figure 6, Fig. 6 represents the graph of a relation of conducting electric current I ds and transistor gate pole tension Vg.When time point T5, the sweep signal that sweep trace Gn-1 transmits is opened the 3rd transistor 213 once again makes conducting electric current I ds be sent to judging unit 108 via transmission line Bn.
See also Fig. 7, Fig. 7 is the circuit block diagram of the judging unit 108 of Fig. 2.Judging unit 108 comprises a plurality of integrating circuit 1082, a plurality of analog/digital converter 1084 and a decision unit 1086.Each integrating circuit 1082 is coupled to a transmission line Bn.The switch element 1088 of integrating circuit 1082 is when closing (turn-off), and the output Vout of integrating circuit 1082 meets equation 2:
That is to say that the output Vout of integrating circuit 1082 can calculate the variation of electric current I ds between the T5-T6, and export the result to analog/digital converter 1084.Whether digital/analog converter 1084 can export one greater than a preset value according to the size of output Vout is judged that signal gives decision unit 1086.Final decision unit 1086 can receive the output of each analog/digital converter 1084, judges which testing circuit 210 is touched, and judges the corresponding coordinate of touched testing circuit 210 on display panels 110 with this result.
Owing to press in the external force of touch control capacitance Cv and vary in size, so the capacitance variation of touch control capacitance Cv also can be along with external force varies in size and difference, the electric current I ds of the related transistor seconds that makes testing circuit 210 212 outputs is also different, so the size of the output Vout of each integrating circuit 1082 can determine the size of external force, thus, integrating circuit 1082 can also be connected directly to decision unit 1086, make and determine the output voltage V out size of unit 1086 according to each integrating circuit 1082, the external force size that determines the coordinate of touched point and put on this coordinate points.
What need pay special attention to is, is to be coupled to node CTRL with sweep trace Gn at the grid of the first transistor 211 of Fig. 2, and it is consistent with the sweep frequency of LCD that this represents that each testing circuit detects cycle of change in voltage of sensing cell output.For instance, if the sweep frequency of LCD is 60Hz, then the interval of each testing circuit detection is about 16.67ms (1/60).In another embodiment, the grid of the first transistor 211 and the 3rd transistor 213 can respectively be coupled to a control signal generator (figure does not show) respectively, in design, the interval that testing circuit detects can be set at 100ms or other cycle, that is to say, this control signal generator is to produce grid and the 3rd transistor that this control signal voltage gives this first transistor every 100ms, but not is not subjected to the 16.67ms single motion of sweep trace.
See also Fig. 8, Fig. 8 is the partial circuit diagram of second embodiment of the display panels of Fig. 1.In the present embodiment, display panels 300 comprises a plurality of pixel cells 200 and a plurality of testing circuit 310.Each testing circuit 310 is coupled to a pixel cell 200.What need pay special attention to is that the number of testing circuit 310 can be less than or equal the number of pixel cell 200, and a plurality of testing circuit 310 is evenly distributed on the display panels 300.Pixel cell 200 comprises a switching transistor 202, a storage capacitors 204 and a liquid crystal capacitance 206.Because the operation principles of pixel cell 200 is consistent with the principle of the described embodiment of Fig. 2, does not give unnecessary details in addition at this.Testing circuit 310 comprises a first transistor 311, a transistor seconds 312 and a sensing cell.Sensing cell is used for producing a dynamic electric voltage in node Y in a specific period, therefore in the present embodiment, sensing cell can be a touch control capacitance Cv, its principle is in the specific period, according to the capacitance of touch control capacitance Cv dynamic change, making touch control capacitance Cv export node Y to is a dynamic electric voltage.The operation principles of relevant touch control capacitance Cv is existing the description in the embodiment of Fig. 3 and Fig. 4, do not give unnecessary details in addition at this.
See also Fig. 8 and Fig. 9, Fig. 9 is the sequential chart of each signal wire of Fig. 8.When time point T0, the sweep signal that gate drivers 102 produces is opened switching transistor 202 via sweep trace Gn-1, and at this moment, the voltage data signal that source electrode driver 104 produces can be sent to liquid crystal capacitance 206 by data line Dn and via switching transistor 202.When time point T1, the sweep signal sweep trace Gn that gate drivers 102 produces opens the first transistor 311 via switching transistor 202, and this moment, transmission line Rn can be sent to node Y via the first transistor 311 with a fixed voltage (10V).Touch control capacitance Cv this moment (that is sensing cell) can store fixed voltage, and makes the voltage Vy of node Y keep 10V to be scanned the sweep signal that line Gn transmits once again up to the first transistor 311 next time and to open.Between period T2-T3,,, make transistor seconds 212 to produce an electric current I ds according to voltage Vy so fixed voltage can be opened transistor seconds 212 because the grid of transistor seconds 312 and the grid of switching transistor 202 all are electrically connected to sweep trace Gn-1.Consult equation 1, electric current I ds is relevant with the voltage Vy of node Y, and when the voltage Vy of node Y is fixed as 10V, electric current I ds also can keep a fixed value.When time point T2, the sweep signal that gate drivers 102 produces is via sweep trace G
N-1Not only open switching transistor 202, also open transistor seconds 312 simultaneously, the transistor seconds of opening this moment 312 can be with electric current I ds conducting to transmission line Bn, and is received by judging unit 108.
When time point T3, the sweep signal of sweep trace Gn is opened the first transistor 311 once again, and the voltage of node Y is maintained 10V.When time point T4, as described in Fig. 3 and Fig. 4, touch control capacitance Cv causes its electric capacity to increase because of an external force, and then makes the voltage Vy of node Y descend.At this moment, the conducting electric current I ds of transistor seconds 212 can change (please refer to equation 1) because of the variation of voltage Vy.When time point T5, the sweep signal that sweep trace Gn-1 transmits is opened transistor seconds 312 once again makes conducting electric current I ds be sent to judging unit 108 via transmission line Bn.
Finally, as shown in Figure 7, judging unit 108 can be judged which testing circuit 310 is touched, and judge the coordinate of touched testing circuit 310 on display panels 300 with this result according to the conducting electric current I ds size that transmits.
In another embodiment, the grid of the grid of the first transistor 311 and the 3rd transistor 213 can respectively be respectively to be coupled to a control signal generator (figure does not show), in design, the interval that testing circuit detects can be set at 100ms or other cycle, that is to say, this control signal generator is to produce grid and the 3rd transistorized grid that this control signal voltage gives this first transistor every 100ms, but not is not subjected to the 16.67ms single motion of sweep trace.
See also Figure 10, Figure 10 is the partial circuit diagram of the display panels of the third embodiment of the present invention.In the present embodiment, display panels 400 comprises a plurality of pixel cells 200 and a plurality of testing circuit.Each testing circuit 410 is coupled to a pixel cell 200.What need pay special attention to is that the number of testing circuit 410 can be less than or equal the number of pixel cell 200, and a plurality of testing circuit 410 is evenly distributed on the display panels 300.Pixel cell 200 comprises a switching transistor 202, a storage capacitors 204 and a liquid crystal capacitance 206.Because the operation principles of pixel cell 200 is consistent with the principle of the described embodiment of Fig. 2, does not give unnecessary details in addition at this.Testing circuit 410 comprises a transistor 411, a change-over circuit 412 and a sensing cell.Change-over circuit 412 comprises an operational amplifier 414, a feedback capacity Cf and a switch element 416.Operational amplifier 414 comprises a first input end 421, one second input end 422 and an output terminal 423.First input end is coupled to a reference voltage end Vref, and this reference voltage end Vref is used to provide a direct current reference voltage.For ease of explanation, in the present embodiment, reference voltage is 5V.Whole change-over circuit 412 can be considered an integrating circuit.When sweep trace Gn transmitted the one scan signal, switch element 416 can open and close (turn-onff).Otherwise when sweep trace Gn did not transmit sweep signal and opens, switch element 416 can be closed unlatching (turn-on), made short circuit between second input end 422 and the output terminal 423.Sensing cell is used for producing a dynamic electric voltage at node Y in a specific period, therefore in the present embodiment, sensing cell can be a touch control capacitance Cv, its principle is in the specific period, because the capacitance of touch control capacitance Cv meeting dynamic change, institute is a dynamic electric voltage so that touch control capacitance Cv exports node Y to.The operation principles of relevant touch control capacitance Cv is existing the description in the embodiment of Fig. 3 and Fig. 4, do not give unnecessary details in addition at this.
See also Figure 10 and Figure 11, Figure 11 is the sequential chart of each signal wire of Figure 10.When time point T0, the sweep signal that gate drivers 102 produces is opened switching transistor 202 via sweep trace Gn, at this moment, the voltage data signal that source electrode driver 104 produces can be sent to liquid crystal capacitance 206 by data line Dn and via switching transistor 202, and the sweep signal that gate drivers 102 produces is via sweep trace Gn turn-on transistor 411, makes the current potential of node Y equal the current potential of second input end 422 of operational amplifier 414 (that is reference voltage Vref=5V).Because switch element is also opened for 416 this moments, so the voltage of the output terminal 423 of operational amplifier 414 also is 5V at this moment.
When period T0-T1, as described in Fig. 3 and Fig. 4, touch control capacitance Cv causes its electric capacity to increase because of an external force, and then makes the voltage Vy of node Y descend.At this moment, the conducting electric current I ds of transistor 411 can change (please refer to equation 1) because of the variation of voltage Vy.When time point T1, the sweep signal that sweep trace Gn transmits turn-on transistor 411 once again makes conducting electric current I ds to feedback capacity Cf charging, makes the voltage Vout of output terminal 423 of operational amplifier 414 rise.And decision unit (figure does not show) can be judged which testing circuit 410 is touched, and judge the coordinate of touched testing circuit 410 on display panels 300 with this result according to the voltage Vout size of each testing circuit transmission.
LCD of the present invention is that a plurality of sensing cells are integrated among the display panels, and provides a plurality of testing circuits to detect the change in voltage of each sensing cell output.Can judge the coordinate of touched touch control capacitance according to this change in voltage at display panels.Because sensing cell is to be incorporated in the display panels, not only can reduce LCD overall weight and volume, also helps stressing now the lcd products of thin design.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention is as the criterion when looking the claim person of defining of the present invention.
Claims (15)
1. LCD, it comprises:
The one source pole driver is used for producing a voltage data signal;
One gate drivers is used for producing the one scan signal;
A plurality of pixel cells, these a plurality of pixel cells are arranged, and each pixel cell comprises:
One switching transistor is used for when this sweep signal is opened this switching transistor this voltage data signal of conducting;
One liquid crystal capacitance comprises a plurality of liquid crystal molecules, and the one end is coupled to this switching transistor, and the other end is coupled to altogether voltage end, is used for adjusting according to this voltage data signal the arrangement of these a plurality of liquid crystal molecules;
A plurality of testing circuits, each testing circuit are electrically connected on a pixel cell of these a plurality of pixel cells, and this each testing circuit comprises:
One the first transistor couples a fixed voltage end, and when a control signal was opened this first transistor, fixed voltage was preset in this fixed voltage end conducting one certainly;
One sensing cell is coupled to this first transistor, is used for producing a dynamic electric voltage;
One transistor seconds is coupled to this sensing cell, produces a dynamic current according to this dynamic electric voltage;
One the 3rd transistor is coupled to this transistor seconds, when the 3rd transistor is opened, and this dynamic current of conducting;
One judging unit is coupled to this a plurality of testing circuits, is used for relatively the dynamic current of these a plurality of testing circuits outputs to judge the source of this dynamic current.
2. LCD as claimed in claim 1, wherein, this sensing cell is a variable capacitance.
3. LCD as claimed in claim 1, wherein, this control signal is the sweep signal that this gate drivers puts on the next column pixel cell.
4. LCD as claimed in claim 1, it comprises a control signal generator in addition, is coupled to the control end of this first transistor, is used for producing this control signal and gives this first transistor.
5. LCD as claimed in claim 1, wherein, first end of this transistor seconds is coupled to the 3rd transistorized second end, and second end of this transistor seconds is coupled to this common-battery pressure side, and the control end of this transistor seconds is coupled to this sensing cell.
6. LCD as claimed in claim 1, wherein, the 3rd transistorized control end is coupled to the control end of this switching transistor.
7. LCD, it comprises:
The one source pole driver is used for producing a voltage data signal;
One gate drivers is used for producing the one scan signal;
A plurality of pixel cells, these a plurality of pixel cells are arranged, and each pixel cell comprises:
One switching transistor is used for when this sweep signal is opened this switching transistor this voltage data signal of conducting;
One liquid crystal capacitance is used for adjusting according to this voltage data signal the arrangement of liquid crystal molecule;
A plurality of testing circuits, each testing circuit are electrically connected on a pixel cell of these a plurality of pixel cells, and this each testing circuit comprises:
One the first transistor couples a fixed voltage end, when a control signal voltage is opened this first transistor, and this fixed voltage end conducting one fixed voltage certainly;
One sensing cell is coupled to this first transistor, is used for producing a dynamic electric voltage; And
One transistor seconds is coupled to this sensing cell, when this transistor seconds is opened, produces a dynamic current according to this dynamic electric voltage;
One judging unit is coupled to this a plurality of testing circuits, is used for relatively the dynamic current of these a plurality of testing circuits outputs to judge the source of dynamic current.
8. LCD as claimed in claim 7, wherein, this sensing cell is a variable capacitance.
9. LCD as claimed in claim 7, wherein, this control signal voltage is the sweep signal that this gate drivers puts on the next column pixel cell.
10. LCD as claimed in claim 7, it comprises a control signal generator in addition, is coupled to the control end of this first transistor, is used for producing this control signal voltage and gives this first transistor.
11. LCD as claimed in claim 7, wherein, first end of this transistor seconds is coupled to this judging unit, and second end of this transistor seconds is coupled to this sensing cell and this first transistor, and the control end of this transistor seconds is coupled to the control end of this switching transistor.
12. a LCD, it comprises:
The one source pole driver is used for producing a voltage data signal;
One gate drivers is used for producing the one scan signal;
A plurality of pixel cells, these a plurality of pixel cells are arranged, and each pixel cell comprises:
One switching transistor is used for when this sweep signal is opened this switching transistor this voltage data signal of conducting;
One liquid crystal capacitance is used for adjusting according to this voltage data signal the arrangement of liquid crystal molecule;
A plurality of testing circuits, each testing circuit are electrically connected on a pixel cell of these a plurality of pixel cells
This each testing circuit comprises:
One sensing cell is used for producing a dynamic electric voltage;
One transistor when a control signal voltage is opened this transistor, produces a dynamic current according to this dynamic electric voltage;
One change-over circuit, being used for changing this dynamic current is a judgement voltage signal; And
One decision unit is used for relatively the judgement voltage signal should a plurality of testing circuits the exported position with a testing circuit of judging these a plurality of testing circuits.
13. LCD as claimed in claim 12, wherein, this sensing cell is a variable capacitance.
14. LCD as claimed in claim 12, wherein, this transistorized control end is coupled to the control end of this switching transistor.
15. LCD as claimed in claim 12, wherein, this change-over circuit comprises:
One operational amplifier comprises a first input end, one second input end and an output terminal, and this first input end couples a fixed voltage end;
One switch element is coupled between this second input end and this output terminal; And
One feedback capacity is coupled to this transistor, is used for changing this dynamic current and being this judgement voltage signal when this switch element is opened.
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| CNB2006101536929A CN100405146C (en) | 2006-09-14 | 2006-09-14 | Touch controlled type liquid crystal display |
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| CNB2006101536929A CN100405146C (en) | 2006-09-14 | 2006-09-14 | Touch controlled type liquid crystal display |
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| CN101276107B (en) * | 2007-03-30 | 2010-09-08 | 乐金显示有限公司 | Liquid crystal display device with sensing function and method of fabricaging the same |
| CN101859039A (en) * | 2010-05-28 | 2010-10-13 | 友达光电股份有限公司 | Touch detection method and flat panel display with embedded type touch panel |
| CN101520837B (en) * | 2008-02-25 | 2010-12-08 | 奇景光电股份有限公司 | Capacitance-typed fingerprint sensor and panel thereof |
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| CN101999143A (en) * | 2008-04-11 | 2011-03-30 | 乐金显示有限公司 | Display device and input device |
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