CN104269142B - Touch drive circuit and its driving method - Google Patents
Touch drive circuit and its driving method Download PDFInfo
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- CN104269142B CN104269142B CN201410587677.XA CN201410587677A CN104269142B CN 104269142 B CN104269142 B CN 104269142B CN 201410587677 A CN201410587677 A CN 201410587677A CN 104269142 B CN104269142 B CN 104269142B
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Abstract
Drive circuit and its driving method are touched the invention provides one kind.The touch drive circuit includes：Data-signal input block, sends data voltage；Touch signal generation unit, produces touch signal；Luminescence unit, carries out luminescence display；Luminous controling unit, controls the luminescence display of luminescence unit；Driver element, the touch signal that touch signal generation unit is produced is amplified in touch signal reconnaissance phase, and luminous controling unit is driven in the pixel driver display stage；Touch detection unit, in the touch signal that the detection of touch signal reconnaissance phase is amplified through driver element；And threshold compensation unit, in the touch signal reconnaissance phase stage, so that the grid voltage of driver element is equal to the threshold voltage of driver element, and receive the data voltage of data-signal input block transmission so that the grid voltage of driver element is equal to data voltage and threshold voltage sum；And show the stage in pixel driver so that flow through the constant current hold of driver element.
Description
Technical field
The present invention relates to touch and display field, drive circuit and its driving method are touched more particularly to one kind.
Background technology
Touch-screen (touch screen) is increasingly focused in consumption electronic product market.Current touch-screen
In portable type electronic product being had been widely used for as the interface of man-machine interaction, such as Mobile phone screen, notebook computer, digital camera
Deng.Touch screen technology can be divided into two classes：Externally positioned type (external) and internally-arranged type (in-cell).Externally positioned type touch-screen turns round and look at name
Think justice be exactly over the display face place a touching device again.Externally positioned type touch-screen is widely used for the Mobile solutions such as mobile phone
In product.However, externally positioned type touch-screen improves touch display unit cost, the thickness of touch display unit is increased.Especially
When the size of touch display unit is increasing, the two shortcomings of externally positioned type touch-screen are just displayed all the more.Currently, such as hand
The consumer electronics products such as machine, panel computer will cube it is smaller, thickness is thinner, and weight is lighter.And In-cell touch screen by
In display panel is incorporated into, therefore can well solve these problems.
AMOLED (active matrix organic light-emitting diode) displays are because with visual angle light, color contrast effect be good, response
Speed block and low cost and other advantages, so as to be applied widely.It is by driving thin film transistor (TFT) that AMOLED can light
The electric current that (Thin Film Transistor, TFT) is produced when saturated is driven.Because in input identical gray scale voltage
When, different critical voltages can produce different driving currents, cause the inconsistency of electric current.Thin film transistor backplane is in technique
During drive thin film transistor (TFT) threshold voltage (Vth) uniformity it is excessively poor, while Vth also has drift.Therefore it is traditional
It is very poor always comprising two thin film transistor (TFT)s and storage capacitance (abbreviation 2T1C) circuit brightness uniformity.In addition with work
The increase of time, the degeneration of Organic Light Emitting Diode (OLED) can also cause the rising of itself cut-in voltage, so as to cause display
Shield the decline of brightness and show uneven.
The content of the invention
Drive circuit and its driving method are touched the invention provides one kind, is used to solve the threshold value of existing driving transistor
Voltage drift and cause the current unevenness that different Organic Light Emitting Diodes are flowed through when identical data voltage is received even so as to make
Into the uneven problem of whole screen display, while also solving current consumption electronic product requires that screen volume is smaller, it is thick
Spend thinner, the lighter problem of weight.
In order to solve the above problems, drive circuit is touched the invention provides one kind, including：
Data-signal input block, for receiving data-signal, and sends data voltage；
Touch signal generation unit, for producing touch signal in touch signal reconnaissance phase；
Luminescence unit, for carrying out luminescence display；
Luminous controling unit, is connected to luminescence unit, in the luminous of pixel driver display stage control luminescence unit
Display；
Driver element, is respectively connecting to touch signal generation unit and luminous controling unit, for being detected in touch signal
Stage amplifies the touch signal that the touch signal generation unit is produced, and the light emitting control is driven in the pixel driver display stage
Unit；
Touch detection unit, is connected to driver element, for amplifying through driver element in the detection of touch signal reconnaissance phase
Touch signal；And
Threshold compensation unit, is respectively connecting to data-signal input block and driver element, for being detected in touch signal
Stage in stage so that the grid voltage of the driver element is equal to the threshold voltage of the driver element, and receive data letter
The data voltage that number input block sends so that the grid voltage of the driver element is equal to the data voltage and the threshold value
Voltage sum；And show the stage in pixel driver so that flow through the constant current hold of the driver element.
Preferably, the luminescence unit is included for luminous Organic Light Emitting Diode.
Preferably, the luminous controling unit includes the first transistor, the grid and luminous signal of the first transistor
(EM) line connection, the first pole is connected with the driver element, and the second pole is connected with luminescence unit.
Preferably, the touch detection unit includes transistor seconds, the grid and selection signal of the transistor seconds
Line is connected, and the first pole is connected with the driver element, and the second pole is connected with touch detection sensor.
Preferably, the driver element include third transistor and the 4th transistor, the grid of the third transistor with
Threshold compensation unit connection, the first pole is connected with the second pole of the 4th transistor, the second pole and the transistor seconds
First pole connects；The grid of the 4th transistor is connected with the second scan signal line, and the first pole is with high voltage end (VDD) even
Connect, the second pole is connected with the threshold compensation unit.
Preferably, the threshold compensation unit includes the 5th transistor, the 6th transistor and the first capacitor, described the
The grid of five transistors is connected with the 3rd scan signal line, and the first pole is connected with the touch signal generation unit, the second pole with
The first pole connection of the third transistor；The first end of first capacitor is connected with data-signal input block, and second
End is connected with the first pole of the 5th transistor；The grid of the 6th transistor is connected with second scan signal line,
First pole is connected with data-signal input block, and the second pole is connected with the second pole of the third transistor.
Preferably, the touch signal generation unit includes the 7th transistor and photodiode, the 7th transistor
Grid be connected with selection signal line, the first pole is connected with the second end of the first capacitor, the of the second pole and photodiode
One end connects；Second end of the photodiode is connected with low-voltage end.
Preferably, the data-signal input block includes the 8th transistor, the grid and first of the 8th transistor
Scan signal line is connected, and the first pole is connected with data signal line, and the second pole is connected with the first end of first capacitor.
Preferably, the first transistor, transistor seconds, third transistor, the 4th transistor, the 5th transistor,
Seven transistors and the 8th transistor are N-type TFTs, and the 6th transistor is P-type TFT.
Present invention also offers a kind of driving method for being applied to above-mentioned touch drive circuit, including：
Touch signal detects step, for being detected to the touch signal that touch unit is produced and is determined touch location
Coordinate；And
Pixel driver step display, for causing that the grid voltage of driver element is equal to the output of data-signal input block
The threshold voltage sum of data voltage and the driver element, so that flowing through the constant current hold of driver element.
Preferably, the touch signal detecting step includes：
Initialization step, in the initialization step, controls the grid voltage of the driver element to be equal to high voltage end
Voltage, and control the luminescence unit to be in off working state by the luminous controling unit；
Voltage compensation step, in the voltage compensation step, controls the grid voltage of the driver element equal to described
The threshold voltage of driver element；
Data write step, in the data write step, is mended from the data-signal input block to the threshold value
Unit input data voltage is repaid, and causes that the grid voltage of the driver element is exported equal to the data-signal input block
Data voltage and the threshold voltage sum；And
Detecting step is touched, in the touch detecting step, touch signal is produced by the touch signal generation unit
And amplify via the driver element, and the touch signal amplified through the driver element by exterior I C detections.
Preferably, the initialization step includes：Control the third transistor, the 4th transistor, the described 5th
Transistor and the 8th transistor turns, control the first transistor, the transistor seconds, the 6th transistor and described
7th transistor cutoff.
Preferably, the voltage compensation step includes：Control the third transistor, the 5th transistor, described
Six transistors and the 8th transistor turns, control the first transistor, the transistor seconds, the 4th transistor
With the 7th transistor cutoff.
Preferably, the data write step includes：Control the third transistor, the 4th transistor and described
Eight transistor turns, control the first transistor, the transistor seconds, the 5th transistor, the 6th transistor
With the 7th transistor cutoff.
Preferably, the detecting step that touches includes：Control the transistor seconds, the third transistor, described
Four transistors and the 7th transistor turns, control the first transistor, the 5th transistor, the 6th transistor
With the 8th transistor cutoff.
Preferably, in the pixel driver step display, the transistor seconds and the 7th transistor is controlled to cut
Only, and the pixel driver step display includes：
Initialization step, in the initialization step, controls the grid voltage of the driver element to be equal to high voltage end
Voltage, and control the luminescence unit to be in off working state by the luminous controling unit；
Voltage compensation step, in the voltage compensation step, controls the grid voltage of the driver element equal to described
The threshold voltage of driver element；
Data write step, in the data write step, is mended from the data-signal input block to the threshold value
Unit input data voltage is repaid, and causes that the grid voltage of the driver element is exported equal to the data-signal input block
Data voltage and the threshold voltage sum；And
Light-emission display step, in the light-emission display step, controls the voltage constant at the first capacitor two ends, from
And the constant current hold of the driver element is flowed through, and made by the driver element driving luminous controling unit described
At luminescence unit in working order.
Preferably, the initialization step includes：Control the third transistor, the 4th transistor, the described 5th
Transistor and the 8th transistor turns, control the first transistor and the 6th transistor cutoff.
Preferably, the voltage compensation step includes：Control the third transistor, the 5th transistor, described
Six transistors and the 8th transistor turns, control the first transistor, the 4th transistor cutoff.
Preferably, the data write step includes：Control the third transistor, the 4th transistor and described
Eight transistor turns, control the first transistor, the 5th transistor and the 6th transistor cutoff.
Preferably, the light-emission display step includes：Control the first transistor, the third transistor and described
Four transistor turns, control the 5th transistor, the 6th transistor and the 8th transistor cutoff.
Optical touch circuit of the invention both has built-in fixed point touch function, and with can compensate for the drive of threshold voltage
Dynamic display function, it is achieved thereby that the integration of internally-arranged type touch function and AMOLED pixel driver display functions, be conducive to by
Display screen is made thinner, lighter, and then reduces production cost.Additionally by using timesharing driving principle, i.e. first carry out light
The detecting of touch signal is learned, AMOLED pixel drivers is then carried out again and is shown, so as to it is determined that being carried out after touch position coordinates
Threshold voltage compensation, i.e., write capacitor to provide driving tube gate source voltage by the diode in saturation by threshold voltage,
So that the driving current of driving tube is unrelated with the threshold voltage of driving tube and the cut-in voltage of OLED, so as to reach the one of electric current
Cause.And then realize the brightness uniformity and reliability of display screen.
Brief description of the drawings
According to reference to the described in detail below of accompanying drawing, the above and other aspect of multiple embodiments of the disclosure, feature with
And advantage will become apparent from, in accompanying drawing：
Fig. 1 is the structured flowchart of optical touch circuit according to embodiments of the present invention；
Fig. 2 is the flow chart of the driving method of optical touch circuit according to embodiments of the present invention；
Fig. 3 is the structured flowchart of optical touch circuit according to another embodiment of the present invention；
Fig. 4 is the flow chart of the driving method of optical touch circuit according to another embodiment of the present invention；And
Fig. 5 is the timing diagram of the optical touch circuit according to illustrated embodiments of the invention.
Specific embodiment
Touch-screen can be divided into externally positioned type (external) and the class of internally-arranged type (in-cell) two.Externally positioned type touch-screen turns round and look at name
Think justice be exactly on a display panel face place a touching device again.And In-cell touch screen is due to being incorporated into display panel,
Therefore can cause that the volume of consumer electronics product is smaller, thickness is thinner, and weight is lighter.Optics in the embodiment of the present invention is touched
It is the hybrid circuit with internally-arranged type optical touch function and AMOLED pixel driver display functions to touch circuit.
With reference to the accompanying drawings and examples, specific implementation of the invention is described in detail.
Reference picture 1, Fig. 1 is the structured flowchart of optical touch circuit according to embodiments of the present invention.Optical touch circuit bag
Include：Luminescence unit 101, luminous controling unit 102, touch signal generation unit 103, driver element 104, touch detection unit
105th, data-signal input block 106 and threshold compensation unit 107.
Luminescence unit 101 is respectively connecting to luminous controling unit 102 and low-voltage end (VSS), including for having for lighting
Machine light emitting diode, and for carrying out luminescence display in the pixel driver display stage.
Luminous controling unit 102 is respectively connecting to luminescence unit 101, driver element 104 and touch detection unit 105, uses
In in the luminous luminescence display for driving and showing stage control luminescence unit 101.
Touch signal generation unit 103 is respectively connecting to driver element 104 and low-voltage end (VSS), for touching letter
Number reconnaissance phase produces touch signal.
Driver element 104 is respectively connecting to touch signal generation unit 103, threshold compensation unit 107, high voltage end
(VDD) and touch detection unit 105 and luminous controling unit 102, produced for amplifying touch signal in touch signal reconnaissance phase
The touch signal that raw unit 103 is produced, luminous controling unit 102 is driven in the pixel driver display stage.
Touch detection unit 105 is respectively connecting to driver element 104, threshold compensation unit 107 and luminous controling unit
102, for the touch signal amplified through driver element 104 in the detection of touch signal reconnaissance phase.
Data-signal input block 106 is connected to threshold compensation unit 107, for receiving data-signal, and is mended to threshold value
Repay the output data voltage (Vdata) of unit 107.
Threshold compensation unit 107 is respectively connecting to data-signal input block 106, driver element 104, touch detection unit
105 and luminous controling unit 102, in touch signal reconnaissance phase so that the grid voltage of driver element 104 is equal to institute
The threshold voltage of driver element 104 is stated, and receives the data voltage of the transmission of data-signal input block 106 so that driven single
The grid voltage of unit 104 is equal to the data voltage and the threshold voltage sum；And show the stage in pixel driver so that
Flow through the constant current hold of driver element 104.
Wherein, the voltage of the voltage more than low-voltage end (VSS) output of high voltage end (VDD) output.
Both there is the optical touch circuit that the present embodiment is provided internally-arranged type to pinpoint touch function, and with can compensate for threshold value
The driving display function of voltage, it is achieved thereby that the integration of internally-arranged type touch function and AMOLED pixel driver display functions,
Be conducive to being made display screen thinner, lighter, and then reduce production cost.Prior art using two due to being provided separately
Circuit (one be used for detect touch, another be used for drive), so as to cause complex circuit designs, and two letters of circuit
Interference is easily produced between number.In addition, threshold voltage is write into capacitor to provide driving tube by the diode in saturation
Gate source voltage so that the driving current of driving tube is unrelated with the cut-in voltage of the threshold voltage of driving tube and OLED, so as to reach
Electric current it is consistent.And then realize the brightness uniformity and reliability of display screen.
Reference picture 2, Fig. 2 is the flow chart of the driving method of optical touch circuit according to embodiments of the present invention, the driving
Method is comprised the following steps：
Touch signal detects step 201, for the touch signal that touch signal generation unit is produced detect simultaneously really
Determine the coordinate of touch location；And
Pixel driver step display 202, for causing that it is defeated that the grid voltage of driver element is equal to data-signal input block
The threshold voltage sum of the data voltage for going out and the driver element, so that flowing through the constant current hold of driver element.
During touch signal detecting step 201, obtain photodiode when illumination is experienced with the shade of finger or dark
Finger is detected to the differentiation signal produced by the reflection of backlight to these differentiation signals under light, and determines to touch
The coordinate of position.So as to realize pinpointing touch function.
During pixel driver step display 202, threshold voltage is write by capacitor by the diode in saturation, come
There is provided the gate source voltage of driving transistor so that the driving current of driving transistor and the threshold voltage of driving transistor and have
The cut-in voltage of machine light emitting diode is unrelated, so as to keep electric current consistent, improves the uniformity and reliability of display screen.
Reference picture 3, Fig. 3 is the structured flowchart of optical touch circuit according to another embodiment of the present invention.Optical touch electricity
Road includes：Luminescence unit 101, luminous controling unit 102, touch signal generation unit 103, driver element 104, touch detection list
Unit 105, data-signal input block 106 and threshold compensation unit 107.
Luminescence unit 101 is used to carry out luminescence display in the pixel driver display stage.
Luminous controling unit 102 is used in the luminous luminescence display for driving and showing stage control luminescence unit 101.
Touch signal generation unit 103 is used to produce touch signal in touch signal reconnaissance phase.
Driver element 104 is used to amplify the touch letter that touch signal generation unit 103 is produced in touch signal reconnaissance phase
Number, drive luminous controling unit 102 in the pixel driver display stage.
Touch detection unit 105 is used for the touch signal amplified through driver element 104 in the detection of touch signal reconnaissance phase.
Data-signal input block 106 is used to receive data-signal, and to the output data voltage of threshold compensation unit 107
(Vdata)。
Threshold compensation unit 107 is used in touch signal reconnaissance phase so that the grid voltage of driver element 104 is equal to
The threshold voltage of the driver element 104, and receive the data voltage of the output of data-signal input block 106 so that drive
The grid voltage of unit 104 is equal to the data voltage and the threshold voltage sum；And the stage is shown in pixel driver, is made
The constant current hold of driver element 104 must be flowed through.
The concrete structure to above-mentioned unit is illustrated below.
Luminescence unit 101 is included for luminous Organic Light Emitting Diode (OLED).Luminous controling unit 102 includes first
Transistor T1.Touch detection unit 105 includes transistor seconds T2.Driver element 104 includes that third transistor T3 and the 4th is brilliant
Body pipe T4.Threshold compensation unit 107 includes the 5th transistor T5, the 6th transistor T6 and the first capacitor Cst.Touch signal
Generation unit 103 includes the 7th transistor T7 and photodiode PD.Data-signal input block 106 includes the 8th transistor
T8。
Specifically, the grid of the first transistor T1 is connected with luminous signal (EM) line, and the first pole is with third transistor T3's
Second pole connects, and the second pole is connected with OLED.
The grid of transistor seconds T2 is connected with selection signal (Select) line, the second pole of the first pole and the 6th transistor
Connection, the second pole is connected with touch detection sensor (Sensor).
The grid of third transistor T3 is connected with second end of capacitor Cst, the first pole and the second of the 4th transistor T4
Pole connects, and the second pole is connected with first pole of transistor seconds T2.
The grid of the 4th transistor T4 is connected with the second scanning signal (Vscan2) line, and the first pole connects with high voltage end VDD
Connect, the second pole is connected with second pole of the 5th transistor T5.
The grid of the 5th transistor T5 is connected with the 3rd scanning signal (Vscan3) line, and the first pole is with the 7th transistor T7's
First pole connects, and the second pole is connected with first pole of third transistor T3.
The first end of the first capacitor Cst is connected with second pole of the 8th transistor T8, the second end and the 5th transistor T5
The first pole connection.
The grid of the 6th transistor is connected with the second scanning signal (Vscan2) line, the first pole and the 8th transistor T8
The second pole connection, the second pole is connected with second pole of third transistor T3.
The grid of the 7th transistor T7 is connected with selection signal (Select) line, and the of the first pole and the first capacitor Cst
Two ends connect, and the second pole is connected with the first end of photodiode PD.
Second end of photodiode PD is connected with low-voltage end VSS.
The grid of the 8th transistor T8 is connected with the first scanning signal (Vscan1) line, the first pole and data-signal
(Vdata) line connection, the second pole is connected with the first end of the first capacitor Cst.
In the present embodiment, the voltage of the voltage more than low-voltage end VSS outputs of high voltage end VDD outputs.The present embodiment
Optical touch circuit driven using timesharing, i.e., carry out the detecting of built-in touch screen signal first, then carry out it is luminous drive it is aobvious
Show.During built-in touch screen signal detection, the first transistor T1, transistor seconds T2, the 5th transistor T5, the 6th transistor
T6, the 7th transistor T7 and the 8th transistor T8 are control pipe, and third transistor T3 is driving tube.The display phase is driven luminous
Between, the first transistor T1, the 4th transistor T4, the 5th transistor T5, the 6th transistor T6 and the 8th transistor T8 are switching tube,
Third transistor T3 is driving tube, and selection signal (Select) is low level, transistor seconds T2 and the 7th transistor T7
All in cut-off state.
Preferably, in the present embodiment, the first transistor T1, transistor seconds T2, third transistor T3, the 4th transistor
T4, the 5th transistor T5, the 7th transistor T7 and the 8th transistor T8 can be N-type TFT, and the 6th transistor T6 can
Think P-type TFT.But type of this specification not to above-mentioned transistor is any limitation as.
Reference picture 4, Fig. 4 is the flow chart of the driving method of optical touch circuit according to another embodiment of the present invention.Should
Driving method is driven using timesharing, that is, touch signal detecting step 401 is first carried out, and then performs pixel driver step display
402。
Fig. 5 is the timing diagram of the optical touch circuit according to illustrated embodiments of the invention.
With reference to the timing diagram of Fig. 5, touch signal detecting step 401 is described first.In initialization step 4011, control
Photodiode PD processed is in off working state.Specifically, during the step, by the first scanning signal (Vscan1), second
Scanning signal (Vscan2), the 3rd scanning signal (Vscan3) are set to high level, by data-signal (Vdata), selection signal
And luminous signal (EM) is set to low level (Select).So, transistor T4, T5, T3 and T8 conductings, transistor T1, T2, T6
End with T7.Data-signal Vdata is write into node A as shown in Figure 3 via transistor T8, the voltage at node A is low
Level.High voltage VDD writes node B as shown in Figure 3 by transistor T4 and T5, and the voltage at node B is VDD.Due to
Transistor T7 is in cut-off state, therefore photodiode PD is in off working state.
At voltage compensation step 4012, the grid voltage of driver element 104 is controlled equal to the threshold value electricity of driver element 104
Pressure Vth.Specifically, during the step, the first scanning signal (Vscan1) and the 3rd scanning signal (Vscan3) are set to
High level, by the second scanning signal (Vscan2), data-signal (Vdata), selection signal (Select) and luminous signal (EM)
It is set to low level.So, transistor T1, T2, T4 and T7 cut-offs, transistor T3, T5, T6 and T8 conducting.Voltage at node B
Discharged by transistor T5, T3 and T6, transistor T3 saturations, so that tension discharge at node B is to threshold voltage vt h.
At data write step 4013, control data signal input unit 106 is to the input data of threshold compensation unit 107
Voltage Vdata, and control the grid voltage of driver element 104 to be equal to the data voltage that data-signal input block 106 is exported
Vdata and threshold voltage vt h sums.Specifically, during the step, by the first scanning signal (Vscan1), the second scanning letter
Number (Vscan2) and data-signal (Vdata) are set to high level, by the 3rd scanning signal (Vscan3), selection signal
And luminous signal (EM) is set to low level (Select).So, transistor T1, T2, T5, T6 and T7 cut-offs, transistor T3, T4
Turned on T8.Data-signal (Vdata) writes node A via transistor T8, and now node B voltage is Vdata+Vth.Transistor
T3 is still on, but photodiode PD does not work still.
Detecting step 4014 is being touched, driver element is amplified to the touch signal that touch signal generation unit is produced,
And the touch signal amplified through the driver element by exterior I C detections.Specifically, during the step, by the second scanning signal
(Vscan2) and selection signal (Select) is set to high level, by the first scanning signal (Vscan1), the 3rd scanning signal
(Vscan3), data-signal (Vdata) and luminous signal (EM) are set to low level.So, transistor T2, T3, T4 and T7 leads
It is logical, transistor T1, T5, T6 and T8 cut-off.Due to transistor T7 conductings, photodiode PD is under illumination, photodiode
(no touch) is different with leakage current when (having touch) under shade under light illumination for PD, the leakage current ratio of photodiode PD under illumination
Leakage current during no light is big.Electric charge on first capacitor Cst is because photodiode PD is by the leakage current produced by illumination
And be greatly decreased.Declined to a great extent so as to cause the voltage at node B.The decline of voltage can cause and flow through transistor at node B
The electric current of T3 reduces.The electric current of the reduction flows through transistor T2 and is sent to IC.The size of the reduction electric current and light strong correlation, light
The electric current of strong bigger generation is bigger.Leakage when touch signal generation unit is based on photodiode PD in no touch and has touch
Current change quantity, produces touch signal.The touch signal causes the change of the change of B point voltages, B point voltages to be put by transistor T3
Being sent to IC by sensor signal lines after big carries out detecting parsing, to determine whether respective pixel position has touch.
Hereinafter, pixel driver step display 402 is described.In the present embodiment, using Organic Light Emitting Diode
Upper luminous mode, has aperture opening ratio higher compared with lower illumination mode.During the step, by selection signal (Select)
Low level is set to, transistor T2 and T7 are all in cut-off state.
In initialization step 4021, the photodiode PD is controlled to be in off working state.Specifically, in the step phase
Between, the first scanning signal (Vscan1), the second scanning signal (Vscan2), the 3rd scanning signal (Vscan3) are set to electricity high
It is flat, data-signal (Vdata), luminous signal (EM) are set to low level.So, transistor T3, T4, T5 and T8 conductings, it is brilliant
Body pipe T1 and T6 end.Data-signal Vdata is write into node A as shown in Figure 3, the electricity at node A via transistor T8
It is low level to press.High voltage VDD writes node B as shown in Figure 3 by transistor T4 and T5, and the voltage at node B is
VDD.Because transistor T7 is in cut-off state, therefore photodiode PD is in off working state.
In voltage compensation step 4022, the grid voltage of driver element 104 is controlled equal to the threshold voltage of driver element 104
Vth.Specifically, during the step, the first scanning signal (Vscan1) and the 3rd scanning signal (Vscan3) are set to height
Level, low level is set to by the second scanning signal (Vscan2), data-signal (Vdata) and luminous signal (EM).So, it is brilliant
Body pipe T1 and T4 end, transistor T3, T5, T6 and T8 conducting.Voltage at node B is discharged by transistor T5, T3 and T6, brilliant
Body pipe T3 saturations, so that tension discharge at node B is to threshold voltage vt h.
In data write step 4023, control data signal input unit 106 is to the input data of threshold compensation unit 107 electricity
Pressure Vdata, and cause that the grid voltage of driver element 104 is equal to the data electricity of the data-signal input block 106 output
Pressure Vdata and threshold voltage vt h sums.Specifically, during the step, by the first scanning signal (Vscan1), the second scanning
Signal (Vscan2) and data-signal (Vdata) are set to high level, by the 3rd scanning signal (Vscan3), luminous signal (EM)
It is set to low level.So, transistor T1, T5 and T6 cut-offs, transistor T3, T4 and T8 conducting.Data-signal (Vdata) via
Transistor T8 writes node A, and now node B voltage is Vdata+Vth.
In light-emission display step 4024, the voltage constant at the first capacitor Cst two ends is controlled, so as to flow through driver element
104 constant current hold.Specifically, during the step, the second scanning signal (Vscan2) and luminous signal (EM) are set
High level is set to, the first scanning signal (Vscan1), the 3rd scanning signal (Vscan3), data-signal (Vdata) are set to
Low level.So, transistor T1, T3 and T4 conductings, transistor T5, T6 and T8 cut-off.The left end A nodes of the first capacitor Cst
The voltage at place is ground voltage VSS.Now, the right-hand member (that is, the grid voltage of transistor T3) of the first capacitor Cst is due to hanging
And there is saltus step so that and the voltages keep constant at the first capacitor Cst two ends, that is, keep the voltage VB=Vdata+ at node B
Vth.Now the electric current of transistor T3 is：
I=k (Vgs-vth) ^2=k (Vdata+Vth-Vth) ^2=k (Vdata) ^2
Which eliminate the influence of the threshold voltage vt h of transistor T3.The electric current of transistor T3 is flowed through so as to improve
Uniformity, realizes the uniform purpose of oled luminance.
Both there is the driving method optical touch circuit of the invention of the present embodiment in-cell to pinpoint touch function, have again
There is the driving display function that can compensate for threshold voltage, it is achieved thereby that in-cell touch functions and AMOLED pixel drivers are aobvious
Show the integration of function.Prior art is because using two circuits being provided separately, (one is used to detect touch that another to be used for
Drive), so as to cause that interference is easily produced between complex circuit designs, and two signals of circuit.Divide additionally by using
When driving principle, it is determined that carrying out threshold voltage compensation after touch position coordinates so that the driving current of driving tube with drive
The threshold voltage of pipe and the cut-in voltage of OLED are unrelated, so as to reach the consistent of electric current.And then realize the brightness of display screen
Uniformity and reliability
Obviously, those skilled in the art can under the premise without departing from the spirit and scope of the present invention to of the invention
Embodiment makes various changes and modifications.The scope of the present invention is limited by appended claims and its equivalent.
Claims (18)
1. one kind touches drive circuit, including：
Data-signal input block, for receiving data-signal, and sends data voltage；
Touch signal generation unit, for producing touch signal in touch signal reconnaissance phase；
Luminescence unit, for carrying out luminescence display；
Luminous controling unit, is connected to luminescence unit, the luminescence display for showing stage control luminescence unit in pixel driver；
Driver element, is respectively connecting to touch signal generation unit and luminous controling unit, in touch signal reconnaissance phase
Amplify the touch signal that the touch signal generation unit is produced, the light emitting control list is driven in the pixel driver display stage
Unit；
Touch detection unit, is connected to driver element, for the touching through driver element amplification in the detection of touch signal reconnaissance phase
Touch signal；And
Threshold compensation unit, is respectively connecting to data-signal input block and driver element, in touch signal reconnaissance phase
Stage so that the grid voltage of the driver element is equal to the threshold voltage of the driver element, and it is defeated to receive data-signal
Enter the data voltage of unit transmission so that the grid voltage of the driver element is equal to the data voltage and the threshold voltage
Sum；And show the stage in pixel driver so that flow through the constant current hold of the driver element,
Wherein, the driver element includes third transistor and the 4th transistor, the grid of the third transistor and the threshold
Value compensating unit connection, the first pole is connected with the second pole of the 4th transistor, and the second pole is connected with the luminous controling unit；Institute
The grid for stating the 4th transistor is connected with the second scan signal line, and the first pole is connected with high voltage end, the second pole and the threshold value
Compensating unit is connected.
2. touch drive circuit according to claim 1, wherein, the luminescence unit is included for luminous organic light emission
Diode.
3. touch drive circuit according to claim 1, wherein, the luminous controling unit includes the first transistor, institute
The grid for stating the first transistor is connected with luminous signal line, and the first pole is connected with the driver element, the second pole and luminescence unit
Connection.
4. touch drive circuit according to claim 1, wherein, the touch detection unit includes transistor seconds, institute
The grid for stating transistor seconds is connected with selection signal line, and the first pole is connected with the driver element, the second pole and touch detection
Sensor is connected.
5. touch drive circuit according to claim 1, wherein, the threshold compensation unit includes the 5th transistor, the
Six transistors and the first capacitor, the grid of the 5th transistor are connected with the 3rd scan signal line, and the first pole is touched with described
The connection of signal generation unit is touched, the second pole is connected with the first pole of the third transistor；The first end of first capacitor
It is connected with data-signal input block, the second end is connected with the first pole of the 5th transistor；The grid of the 6th transistor
Pole is connected with second scan signal line, and the first pole is connected with data-signal input block, the second pole and the 3rd crystal
The second pole connection of pipe.
6. touch drive circuit according to claim 1, wherein, the touch signal generation unit includes the 7th transistor
And photodiode, the grid of the 7th transistor is connected with selection signal line, and the first pole is connected with threshold compensation unit, and
Two poles are connected with the negative electrode of photodiode；The anode of the photodiode is connected with low-voltage end.
7. touch drive circuit according to claim 1, wherein, the data-signal input block includes the 8th crystal
Pipe, the grid of the 8th transistor is connected with the first scan signal line, and the first pole is connected with data signal line, the second pole and institute
State threshold compensation unit connection.
8. touch drive circuit according to claim 1, wherein, the third transistor and the 4th transistor are thin N-types
Film transistor.
9. touch drive circuit according to claim 3, wherein, the first transistor is N-type TFT.
10. touch drive circuit according to claim 4, wherein, the transistor seconds is N-type TFT.
11. touch drive circuits according to claim 5, wherein, the 5th transistor is N-type TFT, institute
It is P-type TFT to state the 6th transistor.
12. touch drive circuits according to claim 6, wherein, the 7th transistor is N-type TFT.
13. touch drive circuits according to claim 7, wherein, the 8th transistor is N-type TFT.
A kind of 14. driving methods of the touch drive circuit being applied to described in claim 1, the touch drive circuit includes number
According to signal input unit, touch signal generation unit, luminescence unit, luminous controling unit, driver element, touch detection unit,
And threshold compensation unit, wherein the luminous controling unit includes the first transistor, grid and the hair of the first transistor
Optical signal line is connected, and the first pole is connected with the driver element, and the second pole is connected with luminescence unit；The threshold compensation unit bag
The 5th transistor, the 6th transistor and the first capacitor are included, the grid of the 5th transistor and the 3rd scan signal line connect
Connect, the first pole is connected with the touch signal generation unit, the second pole is connected with the first pole of the third transistor；Described
The first end of one capacitor is connected with data-signal input block, and the second end is connected with the first pole of the 5th transistor；Institute
The grid for stating the 6th transistor is connected with second scan signal line, and the first pole is connected with data-signal input block, and second
Pole is connected with the second pole of the third transistor；And the data-signal input block includes the 8th transistor, described the
The grid of eight transistors is connected with the first scan signal line, and the first pole is connected with data signal line, and the second pole is mended with the threshold value
Unit connection is repaid, methods described includes：
Touch signal detect step, for being detected to the touch signal that touch signal generation unit is produced and determined touch position
The coordinate put；And
Pixel driver step display, for causing that the grid voltage of driver element is equal to the data of data-signal input block output
The threshold voltage sum of voltage and the driver element, so that the constant current hold of driver element is flowed through,
Wherein, in the pixel driver step display, the touch signal generation unit and the touch detection unit are controlled
Disconnect, the pixel driver step display includes：
Initialization step, in the initialization step, controls the grid voltage of the driver element equal to the electricity of high voltage end
Pressure, and control the luminescence unit to be in off working state by the luminous controling unit；
Voltage compensation step, in the voltage compensation step, controls the grid voltage of the driver element to be equal to the driving
The threshold voltage of unit；
Data write step, in the data write step, from the data-signal input block to the valve value compensation list
First input data voltage, and cause that the grid voltage of the driver element is equal to the number of data-signal input block output
According to voltage and the threshold voltage sum；And
Light-emission display step, in the light-emission display step, controls the voltage constant at the first capacitor two ends, so as to flow
Through the constant current hold of the driver element, and it is described luminous to drive the luminous controling unit to make by the driver element
At unit in working order,
Wherein, the voltage compensation step includes：Control the third transistor, the 5th transistor, the 6th crystal
Pipe and the 8th transistor turns, control the first transistor and the 4th transistor cutoff so that the driving list
The grid voltage of unit is down to the threshold voltage of the driver element from the voltage of high voltage end.
15. driving methods according to claim 14, wherein, the touch signal detecting step includes：
Initialization step, in the initialization step, controls the grid voltage of the driver element equal to the electricity of high voltage end
Pressure, and control the luminescence unit to be in off working state by the luminous controling unit；
Voltage compensation step, in the voltage compensation step, controls the grid voltage of the driver element to be equal to the driving
The threshold voltage of unit；
Data write step, in the data write step, from the data-signal input block to the valve value compensation list
First input data voltage, and cause that the grid voltage of the driver element is equal to the number of data-signal input block output
According to voltage and the threshold voltage sum；And
Detecting step is touched, in the touch detecting step, touch signal is produced and via drive by touch signal generation unit
Moving cell amplifies, and the touch signal amplified through the driver element by exterior I C detections.
16. driving methods according to claim 14, wherein, the initialization step includes：Control the 3rd crystal
Pipe, the 4th transistor, the 5th transistor and the 8th transistor turns, control the first transistor and described
6th transistor cutoff.
17. driving methods according to claim 14, wherein, the data write step includes：Control the 3rd crystalline substance
Body pipe, the 4th transistor and the 8th transistor turns, control the first transistor, the 5th transistor and institute
State the 6th transistor cutoff.
18. driving methods according to claim 14, wherein, the light-emission display step includes：Control first crystalline substance
Body pipe, the third transistor and the 4th transistor turns, control the 5th transistor, the 6th transistor and institute
State the 8th transistor cutoff.
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| CN105047118B (en) | 2015-09-18 | 2018-11-23 | 京东方科技集团股份有限公司 | Circuit for reversing and its driving method, touch-control display panel and touch control display apparatus |
| CN105118438B (en) * | 2015-09-21 | 2017-07-25 | 京东方科技集团股份有限公司 | Pixel-driving circuit, method, image element circuit and display device |
| TWI596592B (en) * | 2016-10-19 | 2017-08-21 | 創王光電股份有限公司 | Compensation pixel circuit |
| CN106782272B (en) * | 2017-01-18 | 2021-01-15 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| CN107945736B (en) * | 2018-01-02 | 2020-02-07 | 京东方科技集团股份有限公司 | Pixel control circuit, pixel control method, pixel unit, display substrate and device |
| US10423286B1 (en) * | 2018-03-09 | 2019-09-24 | Int Tech Co., Ltd. | Circuit for fingerprint sensing and electronic device comprising the circuit |
| CN108470543A (en) * | 2018-05-23 | 2018-08-31 | 武汉华星光电半导体显示技术有限公司 | A kind of pixel circuit and its driving method, display panel |
| CN110444158B (en) | 2019-08-19 | 2021-02-02 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof, display panel and display device |
| CN111599313B (en) * | 2020-06-01 | 2021-07-09 | 昆山国显光电有限公司 | Pixel driving circuit, driving method and display panel |
| CN112817486B (en) * | 2021-02-25 | 2023-12-01 | 奕力科技股份有限公司 | touch display device |
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| KR20120014808A (en) * | 2010-08-10 | 2012-02-20 | 엘지디스플레이 주식회사 | LCD including touch sensor, driving method thereof and manufacturing method thereof |
| CN103135846B (en) * | 2012-12-18 | 2016-03-30 | 北京京东方光电科技有限公司 | Touch display circuit structure and driving method, array base palte and display device |
| CN203300194U (en) * | 2013-07-01 | 2013-11-20 | 京东方科技集团股份有限公司 | Pixel circuit and display device |
| CN203366702U (en) * | 2013-07-09 | 2013-12-25 | 京东方科技集团股份有限公司 | Touch display driving circuit and display device |
| CN203502926U (en) * | 2013-07-31 | 2014-03-26 | 京东方科技集团股份有限公司 | Organic light emitting diode pixel circuit and display device |
| CN103413521B (en) * | 2013-07-31 | 2015-06-10 | 京东方科技集团股份有限公司 | Organic light-emitting diode pixel circuit, method for driving same and display device |
| CN103413522B (en) * | 2013-07-31 | 2015-04-22 | 京东方科技集团股份有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
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