CN203825988U - Pixel driving circuit, array substrate and display device - Google Patents
Pixel driving circuit, array substrate and display device Download PDFInfo
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- CN203825988U CN203825988U CN201420248033.3U CN201420248033U CN203825988U CN 203825988 U CN203825988 U CN 203825988U CN 201420248033 U CN201420248033 U CN 201420248033U CN 203825988 U CN203825988 U CN 203825988U
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Abstract
The utility model relates to the display technology field and discloses a pixel driving circuit. The pixel driving circuit is characterized by comprising a data line, a first scanning line, a second scanning line, a power source line, a light emitting device, a display sub circuit and a light-sensitive sub circuit, wherein the display sub circuit is connected with the data line, the first scanning line, the second scanning line, the power source line and the light emitting device and is used for driving the light emitting device to realize light emitting and displaying under the control of the first scanning line, the second scanning line, the data line and the power source line, and the light-sensitive sub circuit is connected with the data line, the second scanning line and an enablement control line and is used for inducing touch motions under the control of the first scanning line, the second scanning line and the data line. The utility model further discloses a pixel driving method, an array substrate and a display device. The pixel driving circuit comprises the display sub circuit and the light-sensitive sub circuit, and the first scanning line and the second scanning line simultaneously realize displaying and touch induction.
Description
Technical field
The utility model relates to display technique field, particularly a kind of pixel-driving circuit, array base palte and display device.
Background technology
Organic light emitting display (AMOLED) is one of focus of current flat-panel monitor research field, compare with liquid crystal display, the advantages such as OLED has that low energy consumption, production cost are low, autoluminescence, wide visual angle and fast response time, at present, at demonstration field OLED such as mobile phone, PDA, digital cameras, started to replace traditional LCD display.Pixel-driving circuit design is AMOLED display core technology content, has important Research Significance.
At present part light sensation In cell touch technology is in the LCD display of successful Application, a line production commercial city successful volume production in the industry, light sense touch control not only has touch-control sensitivity and the function same with capacitance touching control mode, the advantage of its another one maximum is exactly the restriction that light sense touch control is not subject to screen size, aspect large touch, occupies a tiny space.It not only can, by the direct touch-control of finger, can also use the directly remote touch-control of laser pen simultaneously in addition.
If so light sensation in cell touch technology and AMOLED can be integrated, be about to Touch processing procedure and AMLOED processing procedure and be integrated together, these two kinds of integration that representing state-of-the-art technology function, will certainly show in future the status of field in shaking.Problem demanding prompt solution during therefore, by AMOLED display technique and light sensation In cell touch high effective integration.
Utility model content
(1) technical matters that will solve
The technical problems to be solved in the utility model is: how by AMOLED display technique and light sensation In cell touch high effective integration.
(2) technical scheme
For solving the problems of the technologies described above, the utility model provides a kind of pixel-driving circuit, comprising: data line, the first sweep trace, the second sweep trace, power lead, luminescent device, demonstration electronic circuit and light sensation electronic circuit;
Described demonstration electronic circuit connection data line, the first sweep trace, the second sweep trace, power lead and luminescent device, for driving described luminescent device luminescence display under the control at the first sweep trace, the second sweep trace, data line and power lead;
Described light sensation electronic circuit connects described data line and the second sweep trace, for touch sensitive action under the control at the second sweep trace and data line.
Wherein, described light sensation electronic circuit comprises: reference signal line, signal detection line, the first memory capacitance, induction of signal unit and signal read-write cell;
Described signal read-write cell connects first end, the second sweep trace and the signal detection line of described the first memory capacitance, for the signal of described signal detection line being written to the first end of described the first memory capacitance storage under the control of the second sweep trace, or the signal of described the first memory capacitance storage is read out to described signal detection line;
Described induction of signal unit connects described the second sweep trace, reference signal line and the first memory capacitance, for writing described the first memory capacitance with reference to the signal of signal wire and the light-sensing signal of induction under the control at described the second sweep trace.
Wherein, described signal read-write cell comprises the 6th transistor, described the 6th transistorized grid connects described the second sweep trace, source electrode connects the first end of described the first memory capacitance, drain electrode connects described signal detection line, described the 6th transistor is for the signal of described signal detection line being written to the first end of described the first memory capacitance storage, or the signal that described the first memory capacitance is stored reads out to described signal detection line.
Wherein, described induction of signal unit comprises: the 7th transistor and light sensation transistor, described the 7th transistorized grid connects described the second sweep trace, source electrode connects described reference signal line, drain electrode connects the second end of the transistorized grid of described light sensation and the first memory capacitance, and described the 7th transistor writes reference signal line signal for the second end to described the first memory capacitance; The transistorized grid of described light sensation connects the source electrode of self, and drain electrode connects the first end of described the first memory capacitance, and described light sensation transistor is used for responding to light-sensing signal, and writes the first end of described the first memory capacitance.
Wherein, described demonstration electronic circuit comprises: the second memory capacitance, driving transistors, charge/discharge unit and luminous controling unit, and the source electrode of described driving transistors connects the first end of described the second memory capacitance, and drain electrode connects described luminescent device;
Described charge/discharge unit connects described data line, the first sweep trace, the second sweep trace, power lead, the second memory capacitance and driving transistors, for being charged in described the second memory capacitance two ends and drive transistor gate under the control of described the first sweep trace and the second sweep trace, making the second memory capacitance both end voltage is power line voltage, drive transistor gate voltage is data line voltage, also for described the second memory capacitance being discharged under the control at described the first sweep trace and the second sweep trace, the threshold voltage that the grid source pressure reduction that makes described driving transistors is described driving transistors,
Described luminous controling unit connects the second end and the driving transistors of the first sweep trace, the second memory capacitance, for making described driving transistors connect described power lead to drive described luminescent device luminous under the control at described the first sweep trace.
Wherein, described charge/discharge unit comprises: the first transistor, transistor seconds, the 4th transistor and the 5th transistor; The grid of described the first transistor connects described the second sweep trace, source electrode connects described power lead, drain electrode connects the first end of described the second memory capacitance, described the first transistor is for writing power line voltage the first end of described the second memory capacitance, also for disconnecting the connection of first end and the power lead of described the second memory capacitance, the threshold voltage that the grid source pressure reduction that makes the second memory capacitance be discharged to described driving transistors is described driving transistors; The grid of described transistor seconds connects the first sweep trace, and source electrode connects the second end of described the second memory capacitance, grounded drain, and described transistor seconds is used for the second end ground connection of described the second memory capacitance; Described the 4th transistorized grid connects described the first sweep trace, and source electrode connects described data line, and drain electrode connects the grid of described driving transistors, and described the 4th transistor is set to data line voltage for the grid voltage of described driving transistors; Described the 5th transistorized grid connects described the first sweep trace, and source electrode connects described luminescent device, grounded drain, and described the 5th transistor is used for described luminescent device short circuit ground connection.
Wherein, described luminous controling unit comprises: the 3rd transistor and described the first transistor; Described the 3rd transistorized grid connects described the first sweep trace, source electrode connects the second end of described the second memory capacitance, drain electrode connects the grid of described driving transistors, and described the 3rd transistor forms path for making between the second end of described the second memory capacitance and the grid of described driving transistors; Described the first transistor is for making the source electrode of described driving transistors connect described power lead.
Wherein, described luminescent device is Organic Light Emitting Diode, drain electrode and described the 5th transistorized source electrode of driving transistors described in the anodic bonding of described Organic Light Emitting Diode, plus earth.
The utility model also provides a kind of array base palte, comprises the pixel-driving circuit described in above-mentioned any one.
The utility model also provides a kind of display device, comprises above-mentioned array base palte.
(3) beneficial effect
Pixel-driving circuit of the present utility model comprises demonstration electronic circuit and light sensation electronic circuit, and common signal line (the first sweep trace and the second sweep trace) has realized demonstration and touch sensible simultaneously.
Accompanying drawing explanation
Fig. 1 is a kind of pixel-driving circuit structural representation of the utility model embodiment;
Fig. 2 be in Fig. 1 pixel-driving circuit at the work schematic diagram of reseting stage;
Fig. 3 be in Fig. 1 pixel-driving circuit at the sequential chart of reseting stage, the corresponding sequential stage 1;
Fig. 4 be in Fig. 1 pixel-driving circuit at the work schematic diagram of charging stage;
Fig. 5 be in Fig. 1 pixel-driving circuit at the sequential chart of charging stage, the corresponding sequential stage 2;
Fig. 6 be in Fig. 1 pixel-driving circuit compensation, glow phase work schematic diagram;
Fig. 7 be in Fig. 1 pixel-driving circuit compensation, glow phase sequential chart, the corresponding sequential stage 3.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for illustrating the utility model, but are not used for limiting scope of the present utility model.
The pixel-driving circuit of the present embodiment as shown in Figure 1, comprising: data line Data, the first sweep trace Scan[1], the second sweep trace Scan[2], power lead S, luminescent device D, show electronic circuit 2 and light sensation electronic circuit 1;
Described demonstration electronic circuit 2 connection data line Data, the first sweep trace Scan[1], the second sweep trace Scan[2], power lead S and luminescent device D, at the first sweep trace Scan[1], the second sweep trace Scan[2], drive described luminescent device D luminescence display under the control of data line Data and power lead S.
Described light sensation electronic circuit 1 connects described data line Data and the second sweep trace Scan[2], at the second sweep trace Scan[2] and the control of data line Data under touch sensitive move.
In the present embodiment, light sensation electronic circuit 1 comprises: reference signal line R, signal detection line Y.Read Line, the first memory capacitance C1, induction of signal unit and signal read-write cell.
Signal read-write cell connects the first end of described the first memory capacitance C1, the second sweep trace Scan[2] and signal detection line Y.Read Line, for at the second sweep trace Scan[2] control under the signal of described signal detection line Y.Read Line is written to described the first memory capacitance C1 storage first end (during at initial phase, with the signal of Y.Read Line, carry out the first end of initialization the first memory capacitance C1 storage), or the signal of described the first memory capacitance C1 storage is read out to described signal detection line Y.Read Line (in the signal-obtaining stage, the signal of described the first memory capacitance C1 storage is read out to described signal detection line Y.Read Line).
Described induction of signal unit connects described the second sweep trace Scan[2], reference signal line R and the first memory capacitance C1, at described the second sweep trace Scan[2] control under with reference to the signal of signal wire R and the light-sensing signal of induction, write described the first memory capacitance C1.
The second sweep trace Scan[2 herein] there is the function of horizontal detection line, the data processing unit of display device is (identical with the principle of prior art, repeat no more herein) with Y.Read Line and the Scan[2 of each pixel cell] be connected, when the signal intensity that Y.Read Line output detected exceeds threshold value, thereby define touch action, now by the Y.Read Line of this pixel cell and corresponding Scan[2] determine the place that is touched.
In the present embodiment, signal read-write cell comprises the 6th transistor M3, and the grid of the 6th transistor M3 connects described the second sweep trace Scan[2], source electrode connects the first end of described the first memory capacitance C1, and drain electrode connects described signal detection line Y.Read Line.Described the 6th transistor M3 is for the signal of described signal detection line Y.Read Line being written to the first end of the first memory capacitance C1 storage, at initial phase, as the initialize signal of the first memory capacitance C1 first end.Or the 6th transistor M3 for the signal of described the first memory capacitance storage is read out to described signal detection line Y.Read Line, at signal, read the stage, the signal of described the first memory capacitance storage is read out to described signal detection line Y.Read Line, conventionally an amplifier can be set at the end of signal detection line, signal detection line Y.Read Line can pass the signal to the amplifier of end, signal after amplifying by amplifier carries out data computational analysis to the data processing unit in display device, by photosignal Strength Changes difference before and after touch-control with without touch-control threshold value, compare, judged whether according to this how touch (specifically judges with prior art similar, repeat no more) herein.
Induction of signal unit comprises: the 7th transistor M1 and light sensation transistor M2.The grid of described the 7th transistor M1 connects described the second sweep trace Scan[2], source electrode connects described reference signal line R, and drain electrode connects the grid of described light sensation transistor M2 and the second end of the first memory capacitance C1.Described the 7th transistor M1 writes reference signal line signal for the second end to described the first memory capacitance C1.The grid of described light sensation transistor M2 connects the source electrode of self, and drain electrode connects the first end of described the first memory capacitance C1, and described light sensation transistor M2 is used for responding to light-sensing signal, and writes the first end of described the first memory capacitance C1.
Pixel-driving circuit of the present utility model comprises and shows electronic circuit and light sensation electronic circuit, and common signal line (the first sweep trace, the second sweep trace, data line and enable control line) has realized demonstration and touch sensible (touch of mentioning in the utility model comprises with finger touch or laser touch-control) simultaneously.
In the present embodiment, show that electronic circuit 2 comprises: the second memory capacitance C2, driving transistors DTFT, charge/discharge unit and luminous controling unit.The source electrode of described driving transistors DTFT connects the first end (a point) of described the second memory capacitance, and drain electrode connects described luminescent device D.
Described charge/discharge unit connects described data line Data, the first sweep trace Scan[1], the second sweep trace Scan[2], power lead S, the second memory capacitance C2 and driving transistors DTFT, for at described the first sweep trace Scan[1] and the second sweep trace Scan[2] control under to described the second memory capacitance C2 two ends and driving transistors DTFT gate charges, making the second memory capacitance C2 both end voltage is power line voltage, driving transistors DTFT grid voltage is data line voltage, also at described the first sweep trace Scan[1] and the second sweep trace Scan[2] control under described the second memory capacitance C2 is discharged, the grid source pressure reduction that makes described driving transistors DTFT is the threshold voltage V of described driving transistors DTFT
th.
Described luminous controling unit connects the first sweep trace Scan[1], the second end and the driving transistors DTFT of the second memory capacitance C2, at described the first sweep trace Scan[1] control under make described driving transistors DTFT connect described power lead S to drive described luminescent device D luminous.
In the present embodiment, described charge/discharge unit comprises: the first transistor T1, transistor seconds T2, the 4th transistor T 4 and the 5th transistor T 5.The grid of described the first transistor T1 connects described the second sweep trace Scan[2], source electrode connects described power lead S, and drain electrode connects the first end of described the second memory capacitance C2, and described the first transistor T1 is used for power line voltage (V
dd) write the first end of described the second memory capacitance C2, also, for disconnecting the connection of first end and the power lead S of described the second memory capacitance C2, the grid source pressure reduction that makes the second memory capacitance C2 be discharged to described driving transistors DTFT is the threshold voltage V of described driving transistors DTFT
th.The grid of described transistor seconds T2 connects the first sweep trace Scan[1], source electrode connects the second end (b point) of described the second memory capacitance C2, grounded drain, described transistor seconds T2 is for by the second end ground connection of described the second memory capacitance C2, (be that voltage is 0, now the voltage at the second electric capacity two ends is V
dd); The grid of described the 4th transistor T 4 connects described the first sweep trace Scan[1], source electrode connects described data line Data, drain electrode connects the grid (c point) of described driving transistors DTFT, and described the 4th transistor T 4 is set to data line voltage for the grid voltage of described driving transistors DTFT, and (grid voltage that is driving transistors DTFT is V
data); The grid of described the 5th transistor T 5 connects described the first sweep trace Scan[1], source electrode connects described luminescent device D, grounded drain, described the 5th transistor T 5 is for by described luminescent device D short circuit ground connection.
In the present embodiment, described luminous controling unit comprises: the 3rd transistor T 3 and above-mentioned the first transistor T1.The grid of described the 3rd transistor T 3 connects described the first sweep trace Scan[1], source electrode connects the second end of described the second memory capacitance C2, drain electrode connects the grid of described driving transistors DTFT, described the 3rd transistor T 3 forms path for making between the second end of described the second memory capacitance C2 and the grid of described driving transistors DTFT, is about to the second end of the second memory capacitance C2 and the grid of described driving transistors DTFT and couples together.Described the first transistor T1 is for making the source electrode of described driving transistors DTFT connect described power lead S.
In the present embodiment, described luminescent device D is Organic Light Emitting Diode (OLED), the drain electrode of driving transistors DTFT and the source electrode of described the 5th transistor T 5 described in the anodic bonding of OLED, plus earth.
The pixel-driving circuit of the present embodiment adopts compensation way to solve the threshold voltage V of driving transistors
thchange the impact bringing.This design has simultaneously guaranteed that no current is by luminescent device (OLED), the serviceable life of also indirectly having improved (OLED) when circuit compensates stage and buffer stage.
The utility model is intended to how by AMOLED display technique and light sensation In cell touch high effective integration, therefore, for showing that sub-circuit portion is not limited to the demonstration electronic circuit in the present embodiment, so long as need the first sweep trace, the second sweep trace, data line and enable the demonstration electronic circuit (number of TFT and electric capacity and connected mode can be different) that control line is controlled.
The utility model also provides the driving method of the pixel-driving circuit described in a kind of above-mentioned any one, in the method, described demonstration electronic circuit 2 is at the first sweep trace Scan[1], the second sweep trace Scan[2], drive described luminescent device D luminescence display under the control of data line Data and power lead S; And described light sensation electronic circuit 1 is at the second sweep trace Scan[2] and the control of data line Data under touch sensitive action.
Particularly, described light sensation electronic circuit 1 comprises: reference signal line R, signal detection line Y.Read Line, the first memory capacitance C1, induction of signal unit and signal read-write cell, described light sensation electronic circuit 1 is at the first sweep trace Scan[1], the second sweep trace Scan[2] and the control of data line Data under the step of touch sensitive action specifically comprise:
To the second sweep trace Scan[2] apply the second scanning useful signal, so that described signal read-write cell is written to the signal of described signal detection line Y.Read Line the first end of described the first memory capacitance C1 storage, with the first end of the first memory capacitance C1 described in initialization;
To the second sweep trace Scan[2] apply the 3rd scanning useful signal, so that described induction of signal unit writes described the first memory capacitance C1 with reference to the signal of signal wire R and the light-sensing signal of induction;
To the second sweep trace Scan[2] apply the second scanning useful signal, so that described signal read-write cell reads out to described signal detection line Y.Read Line by the signal of described the first memory capacitance C1 storage.
Particularly, described signal read-write cell comprises the 6th transistor M3, and the grid of described the 6th transistor M3 connects described the second sweep trace Scan[2], source electrode connects the first end of described the first memory capacitance C1, and drain electrode connects described signal detection line Y.Read Line.
To the second sweep trace Scan[2] apply the second scanning useful signal, so that described signal read-write cell is written to the signal of described signal detection line Y.Read Line the first end of described the first memory capacitance C1 storage, with the step of the first end of the first memory capacitance C1 described in initialization, specifically comprise:
To the second sweep trace Scan[2] apply the second scanning useful signal, the 6th transistor M3 opens, the signal of described signal detection line Y.Read Line is written to the first end of described the first memory capacitance C1 storage, with the first end of the first memory capacitance C1 described in initialization;
Described to the second sweep trace Scan[2] apply the second scanning useful signal, so that the step that described signal read-write cell reads out to described signal detection line Y.Read Line by the signal of described the first memory capacitance C1 storage specifically comprises:
To the second sweep trace Scan[2] apply the second scanning useful signal, the 6th transistor M3 opens, and the signal of described the first memory capacitance C1 storage is read out to described signal detection line Y.Read Line.
Particularly, described induction of signal unit comprises: the 7th transistor M1 and light sensation transistor M2, the grid of described the 7th transistor M1 connects described the second sweep trace Scan[2], source electrode connects described reference signal line R, drain electrode connects the grid of described light sensation transistor M2 and the second end of the first memory capacitance C1, the grid of described light sensation transistor M2 connects the source electrode of self, and drain electrode connects the first end of described the first memory capacitance C1;
To the second sweep trace Scan[2] apply the 3rd scanning useful signal, so that the step that described induction of signal unit writes described the first memory capacitance C with reference to the signal of signal wire R and the light-sensing signal of induction specifically comprises:
To the second sweep trace Scan[2] apply the 3rd scanning useful signal, described the 7th transistor M1 and described sensitization transistor M2 open, described the 7th transistor M1 writes the second end of described the first memory capacitance C1 with reference to the signal of signal wire R, described sensitization transistor M2 writes the light-sensing signal of induction the first end of described the first memory capacitance C1.
Particularly, described demonstration electronic circuit 2 comprises: the second memory capacitance C2, driving transistors DTFT, charge/discharge unit and luminous controling unit.The source electrode of described driving transistors DTFT connects the first end of described the second memory capacitance C2, drain electrode connects described luminescent device D, and described demonstration electronic circuit 2 is at the first sweep trace Scan[1], the second sweep trace Scan[2], drive the step of described luminescent device D luminescence display specifically to comprise under the control of data line Data and power lead S:
To described the first sweep trace Scan[1] apply the first scanning useful signal, simultaneously to the second sweep trace Scan[2] apply the second scanning useful signal, described charge/discharge unit is to described the second memory capacitance C2 two ends and driving transistors DTFT gate charges, making the second memory capacitance C2 both end voltage is power line voltage, and driving transistors DTFT grid voltage is data line voltage;
Keep described the first sweep trace Scan[1] be the first scanning useful signal, simultaneously to the second sweep trace Scan[2] apply the 3rd scanning useful signal, described charge/discharge unit discharges to described the second memory capacitance C2, and making the grid source pressure reduction of described driving transistors DTFT is the threshold voltage of described driving transistors DTFT;
To described the first sweep trace Scan[1] apply invalid signals, simultaneously to the second sweep trace Scan[2] apply the second scanning useful signal, described luminous controling unit forms path between the second end of described the second memory capacitance C2 and the grid of described driving transistors DTFT; And the source electrode that makes described driving transistors DTFT connects described power lead S, to drive described luminescent device D luminous.
Particularly, described charge/discharge unit comprises: the first transistor T1, transistor seconds T2, the 4th transistor T 4 and the 5th transistor T 5; The grid of described the first transistor T1 connects described the second sweep trace Scan[2], source electrode connects described power lead S, and drain electrode connects the first end of described the second memory capacitance C2; The grid of described transistor seconds T2 connects the first sweep trace Scan[2], source electrode connects the second end of described the second memory capacitance C2, grounded drain; The grid of described the 4th transistor T 4 connects described the first sweep trace Scan[1], source electrode connects described data line Data, and drain electrode connects the grid of described driving transistors DTFT; The grid of described the 5th transistor T 5 connects described the first sweep trace Scan[1], source electrode connects described luminescent device D, grounded drain;
Described to described the first sweep trace Scan[1] apply the first scanning useful signal, simultaneously to the second sweep trace Scan[2] apply the second scanning useful signal, the gate charges of described charge/discharge unit to described the second memory capacitance C2 two ends and driving transistors DTFT, making the second memory capacitance C2 both end voltage is power line voltage, and the step that driving transistors DTFT grid voltage is data line voltage specifically comprises:
Described to described the first sweep trace Scan[1] apply the first scanning useful signal, simultaneously to the second sweep trace Scan[2] apply the second scanning useful signal, the first transistor T1, transistor seconds T2, the 4th transistor T 4 and the 5th transistor T 5 are opened, and the first transistor T1 writes power line voltage the first end of described the second memory capacitance C2; Described the first transistor T1 is by the second end ground connection of described the second memory capacitance C2; The grid voltage of the described driving transistors DTFT of the 4th transistor T 4 is set to data line voltage; The 5th transistor T 5 is by described luminescent device D short circuit ground connection;
Described the first sweep trace Scan[1 of described maintenance] be the first scanning useful signal, simultaneously to the second sweep trace Scan[2] apply the 3rd scanning useful signal, described charge/discharge unit discharges to described the second memory capacitance C2, and the grid source pressure reduction that makes described driving transistors DTFT is that the step of the threshold voltage of described driving transistors DTFT specifically comprises:
Described the first sweep trace Scan[1 of described maintenance] be the first scanning useful signal, simultaneously to the second sweep trace Scan[2] apply the 3rd scanning useful signal, the first transistor T1 closes, described the second memory capacitance C2 starts electric discharge, and making the grid source pressure reduction of described driving transistors DTFT is the threshold voltage of described driving transistors DTFT.
Particularly, described luminous controling unit comprises: the 3rd transistor T 3 and above-mentioned the first transistor T1; The grid of described the 3rd transistor T 3 connects described the first sweep trace Scan[1], source electrode connects the second end of described the second memory capacitance C2, and drain electrode connects the grid of described driving transistors DTFT;
Described to described the first sweep trace Scan[1] apply invalid signals, simultaneously to the second sweep trace Scan[2] apply the second scanning useful signal, described luminous controling unit forms path between the second end of described the second memory capacitance C2 and the grid of described driving transistors DTFT; And the source electrode that makes described driving transistors DTFT connects described power lead S, to drive the luminous step of described luminescent device D specifically to comprise:
To described the first sweep trace Scan[1] apply invalid signals, simultaneously to the second sweep trace Scan[2] apply the second scanning useful signal, the first transistor T1 and the 3rd transistor T 3 are opened, and the 3rd transistor T 3 makes to form path between the second end of described the second memory capacitance C2 and the grid of described driving transistors DTFT; Described the first transistor T1 makes the source electrode of described driving transistors DTFT connect described power lead S.
Below to above-mentioned pixel-driving circuit, the driving process that is the driving circuit in Fig. 1 is specifically described (wherein except the 3rd transistor T 3, the 7th transistor M1 and light sensation transistor M2 are beyond N-type transistor, all the other are P transistor npn npn, luminescent device is OLED), specifically as shown in Fig. 2～7, comprise that three phases is (here for convenience of understanding, by light sensation electronic circuit and demonstration electronic circuit principle of work separate introduction, but carry out in practical work process simultaneously, Fig. 2, in Fig. 4 and Fig. 6, TFT in dotted line frame is the TFT of conducting, dotted arrow is the current direction of every one-phase).
The sequential chart stage 1, as shown in Figures 2 and 3, the first sweep trace Scan[1] and the second sweep trace Scan[2] be low level (i.e. the first scanning useful signal and the second scanning useful signal).
For light sensation electronic circuit, be signal initial phase, Scan[2] drag down, M3 conducting, by the first memory capacitance C1 access signal detection line Y.Read Line, gathers initialize signal, and the first end of initialization the first memory capacitance, for next stage work is prepared.
For showing electronic circuit, be signal reset phase, Scan[1], Scan[2] drag down, now T1, T2, T4, T5 conducting, T3 disconnects, the first end a point of the second memory capacitance C2 charges to V
dd, the grid that the second end b point ground connection and voltage are 0, DTFT, c point voltage is V
data.T5 opens OLED short circuit ground connection, makes this process electric current can not pass through OLED.
Sequential chart stage 2, as shown in Figures 4 and 5 the first sweep trace Scan[1] be low level, the second sweep trace Scan[2] be high level (the 3rd scanning useful signal, effective to N-type transistor).
For light sensation electronic circuit, be the signal collection stage, M2 is light sensation TFT, M2 grid source connects, Scan[2] draw high M1 conducting, output reference voltage V
d, M2 is through self electromotive force conversion, and the potential difference (PD) that now C1 stores is definite value, when having touch (light touches or finger touch) to herein, the intensity of illumination that M2 receives changes, and charging current changes (if light touches, as laser pen irradiates, intensity of illumination increases, charging current increases, if finger touch is equivalent to block light, intensity of illumination weakens, and charging current reduces).Pressure reduction is stored in C1, for the signal-obtaining stage prepares.
For showing electronic circuit, be discharge regime, Scan[1] low, Scan[2] draw high, now T2, T4, T5 conducting, T1, T3 disconnect, and a point starts electric discharge, discharges into always and meets V
a-V
c=V
thtill, a point current potential is by V
ddbecome V
data+ V
th.Same, this discharge process, can not pass through OLED because closing of T5 makes electric current, has indirectly reduced the loss of OLED.
Sequential chart stage 3, as shown in Figures 6 and 7 the first sweep trace Scan[1] be high level, the second sweep trace Scan[2] be low level.
For light sensation electronic circuit, be read signal stage, Scan[2] drag down, now M1 closes, and M3 opens, and the electric current that is stored in before C1 upper end is discharged, this signal is sent to the amplifier that end receives, and the signal after amplification carries out data computational analysis to data processing unit; So, there is touch-control action, by photosignal Strength Changes difference before and after touch-control with without touch-control threshold value, compare, judged whether according to this touch (irradiation Strength Changes), so far, directions X coordinate is Scan[2 thus time] output point determines, Y-direction coordinate is just determined by read Line.
For showing electronic circuit, be the formal glow phase of OLED pixel, Scan[2] draw high Scan[2] drag down, now T1, T3 conducting, T2, T4, T5 disconnect, and a point voltage reaches V again
dd, b holds suspension joint, V
aand V
brealize the saltus step of voltage equivalent and (keep original pressure reduction V
data+ V
th), so V
b=V
c=V
dd-V
data-V
th, the now disconnection of T5, makes OLED directly enter glow phase.
By driving transistors DTFT saturation current formula, can obtain (wherein, V
gSgate source voltage for DTFT):
I
OLED＝K(V
GS－V
th)
2＝K[V
dd－(V
dd－V
data－V
th)－V
th]
2＝KV
data 2
Wherein, μ is carrier mobility, C
oxfor gate oxide electric capacity, the breadth length ratio that W/L is driving transistors.
In above formula, can see now working current I
oLEDbe not subject to V
thimpact, only and V
datarelevant.Thoroughly solved drive TFT due to manufacturing process and operated and cause threshold voltage (V for a long time
th) drift problem, eliminate it to I
oLEDimpact, guarantee the normal work of OLED.
The utility model also provides a kind of array base palte, comprises above-mentioned pixel-driving circuit.
The utility model also provides a kind of display device, comprises above-mentioned array base palte.This display device can be: AMOLED panel, TV, digital album (digital photo frame), mobile phone, panel computer etc. have product or the parts of any Presentation Function.
Above embodiment is only for illustrating the utility model; and be not limitation of the utility model; the those of ordinary skill in relevant technologies field; in the situation that not departing from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.
Claims (10)
1. a pixel-driving circuit, is characterized in that, comprising: data line, the first sweep trace, the second sweep trace, power lead, luminescent device, demonstration electronic circuit and light sensation electronic circuit;
Described demonstration electronic circuit connection data line, the first sweep trace, the second sweep trace, power lead and luminescent device, for driving described luminescent device luminescence display under the control at the first sweep trace, the second sweep trace, data line and power lead;
Described light sensation electronic circuit connects described data line and the second sweep trace, for touch sensitive action under the control at the second sweep trace and data line.
2. pixel-driving circuit as claimed in claim 1, is characterized in that, described light sensation electronic circuit comprises: reference signal line, signal detection line, the first memory capacitance, induction of signal unit and signal read-write cell;
Described signal read-write cell connects first end, the second sweep trace and the signal detection line of described the first memory capacitance, for the signal of described signal detection line being written to the first end of described the first memory capacitance storage under the control of the second sweep trace, or the signal of described the first memory capacitance storage is read out to described signal detection line;
Described induction of signal unit connects described the second sweep trace, reference signal line and the first memory capacitance, for writing described the first memory capacitance with reference to the signal of signal wire and the light-sensing signal of induction under the control at described the second sweep trace.
3. pixel-driving circuit as claimed in claim 2, it is characterized in that, described signal read-write cell comprises the 6th transistor, described the 6th transistorized grid connects described the second sweep trace, source electrode connects the first end of described the first memory capacitance, drain electrode connects described signal detection line, and described the 6th transistor is for the signal of described signal detection line being written to the first end of described the first memory capacitance storage, or the signal that described the first memory capacitance is stored reads out to described signal detection line.
4. pixel-driving circuit as claimed in claim 2, it is characterized in that, described induction of signal unit comprises: the 7th transistor and light sensation transistor, described the 7th transistorized grid connects described the second sweep trace, source electrode connects described reference signal line, drain electrode connects the second end of the transistorized grid of described light sensation and the first memory capacitance, and described the 7th transistor writes reference signal line signal for the second end to described the first memory capacitance; The transistorized grid of described light sensation connects the source electrode of self, and drain electrode connects the first end of described the first memory capacitance, and described light sensation transistor is used for responding to light-sensing signal, and writes the first end of described the first memory capacitance.
5. the pixel-driving circuit as described in any one in claim 1～4, it is characterized in that, described demonstration electronic circuit comprises: the second memory capacitance, driving transistors, charge/discharge unit and luminous controling unit, the source electrode of described driving transistors connects the first end of described the second memory capacitance, and drain electrode connects described luminescent device;
Described charge/discharge unit connects described data line, the first sweep trace, the second sweep trace, power lead, the second memory capacitance and driving transistors, for being charged in described the second memory capacitance two ends and drive transistor gate under the control of described the first sweep trace and the second sweep trace, making the second memory capacitance both end voltage is power line voltage, drive transistor gate voltage is data line voltage, also for described the second memory capacitance being discharged under the control at described the first sweep trace and the second sweep trace, the threshold voltage that the grid source pressure reduction that makes described driving transistors is described driving transistors,
Described luminous controling unit connects the second end and the driving transistors of the first sweep trace, the second memory capacitance, for making described driving transistors connect described power lead to drive described luminescent device luminous under the control at described the first sweep trace.
6. pixel-driving circuit as claimed in claim 5, is characterized in that, described charge/discharge unit comprises: the first transistor, transistor seconds, the 4th transistor and the 5th transistor; The grid of described the first transistor connects described the second sweep trace, source electrode connects described power lead, drain electrode connects the first end of described the second memory capacitance, described the first transistor is for writing power line voltage the first end of described the second memory capacitance, also for disconnecting the connection of first end and the power lead of described the second memory capacitance, the threshold voltage that the grid source pressure reduction that makes the second memory capacitance be discharged to described driving transistors is described driving transistors; The grid of described transistor seconds connects the first sweep trace, and source electrode connects the second end of described the second memory capacitance, grounded drain, and described transistor seconds is used for the second end ground connection of described the second memory capacitance; Described the 4th transistorized grid connects described the first sweep trace, and source electrode connects described data line, and drain electrode connects the grid of described driving transistors, and described the 4th transistor is set to data line voltage for the grid voltage of described driving transistors; Described the 5th transistorized grid connects described the first sweep trace, and source electrode connects described luminescent device, grounded drain, and described the 5th transistor is used for described luminescent device short circuit ground connection.
7. pixel-driving circuit as claimed in claim 6, is characterized in that, described luminous controling unit comprises: the 3rd transistor and described the first transistor; Described the 3rd transistorized grid connects described the first sweep trace, source electrode connects the second end of described the second memory capacitance, drain electrode connects the grid of described driving transistors, and described the 3rd transistor forms path for making between the second end of described the second memory capacitance and the grid of described driving transistors; Described the first transistor is for making the source electrode of described driving transistors connect described power lead.
8. pixel-driving circuit as claimed in claim 7, is characterized in that, described luminescent device is Organic Light Emitting Diode, drain electrode and described the 5th transistorized source electrode of driving transistors described in the anodic bonding of described Organic Light Emitting Diode, plus earth.
9. an array base palte, is characterized in that, comprises the pixel-driving circuit as described in any one in claim 1～8.
10. a display device, is characterized in that, comprises array base palte as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420248033.3U CN203825988U (en) | 2014-05-14 | 2014-05-14 | Pixel driving circuit, array substrate and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420248033.3U CN203825988U (en) | 2014-05-14 | 2014-05-14 | Pixel driving circuit, array substrate and display device |
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| Publication Number | Publication Date |
|---|---|
| CN203825988U true CN203825988U (en) | 2014-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420248033.3U Withdrawn - After Issue CN203825988U (en) | 2014-05-14 | 2014-05-14 | Pixel driving circuit, array substrate and display device |
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| Country | Link |
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| CN (1) | CN203825988U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103996376A (en) * | 2014-05-14 | 2014-08-20 | 京东方科技集团股份有限公司 | Pixel driving circuit and method, array substrate and display device |
| CN104680980A (en) * | 2015-03-25 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN104700776A (en) * | 2015-03-25 | 2015-06-10 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, display device |
| WO2016177001A1 (en) * | 2015-05-04 | 2016-11-10 | 京东方科技集团股份有限公司 | Pixel circuit, driving method therefor, array substrate and display device thereof |
| JP2017120375A (en) * | 2015-12-25 | 2017-07-06 | Ｎｌｔテクノロジー株式会社 | Display and manufacturing method of display |
| CN107977109A (en) * | 2016-10-21 | 2018-05-01 | 三星显示有限公司 | Display device |
| CN111524483A (en) * | 2020-04-23 | 2020-08-11 | 福建华佳彩有限公司 | OLED external compensation circuit and OLED external compensation method |
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2014
- 2014-05-14 CN CN201420248033.3U patent/CN203825988U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103996376A (en) * | 2014-05-14 | 2014-08-20 | 京东方科技集团股份有限公司 | Pixel driving circuit and method, array substrate and display device |
| WO2015172465A1 (en) * | 2014-05-14 | 2015-11-19 | 京东方科技集团股份有限公司 | Pixel drive circuit, drive method, array substrate and display device |
| CN103996376B (en) * | 2014-05-14 | 2016-03-16 | 京东方科技集团股份有限公司 | Pixel-driving circuit, driving method, array base palte and display device |
| US9760199B2 (en) | 2014-05-14 | 2017-09-12 | Boe Technology Group., Ltd. | Pixel driving circuit and driving method thereof, array substrate and display apparatus |
| CN104680980A (en) * | 2015-03-25 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN104700776A (en) * | 2015-03-25 | 2015-06-10 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, display device |
| WO2016177001A1 (en) * | 2015-05-04 | 2016-11-10 | 京东方科技集团股份有限公司 | Pixel circuit, driving method therefor, array substrate and display device thereof |
| US10262597B2 (en) | 2015-05-04 | 2019-04-16 | Boe Technology Group Co., Ltd. | Pixel circuit and driving method thereof, array substrate and display apparatus |
| JP2017120375A (en) * | 2015-12-25 | 2017-07-06 | Ｎｌｔテクノロジー株式会社 | Display and manufacturing method of display |
| CN107977109A (en) * | 2016-10-21 | 2018-05-01 | 三星显示有限公司 | Display device |
| CN111524483A (en) * | 2020-04-23 | 2020-08-11 | 福建华佳彩有限公司 | OLED external compensation circuit and OLED external compensation method |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |