CN203812536U

CN203812536U - Pixel driving circuit, array substrate and display device

Info

Publication number: CN203812536U
Application number: CN201420229424.0U
Authority: CN
Inventors: 杨盛际
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2014-05-06
Filing date: 2014-05-06
Publication date: 2014-09-03
Anticipated expiration: 2024-05-06

Abstract

The utility model relates to the technical field of display, and discloses a pixel drive circuit. The pixel drive circuit comprises a data line, a first scan line, a second scan line, an enablement control line, a power line, a luminescent device, a display sub circuit and a light-sensing sub circuit. The display sub circuit is connected with the data line, the first scan line, the second scan line, the enablement control line, the power line and the luminescent device, and is used for driving the luminescent device to illumine and display under the control of the first scan line, the second scan line, the enablement control line and the power line. The light-sensing sub circuit is connected with the data line, the first scan line, the second scan line and the enablement control line, and is used for sensing touch motion under the control of the first scan line, the second scan line, the enablement control line and the data line. The utility model also discloses an array substrate and a display apparatus. Because the pixel drive circuit of the utility model comprises the display sub circuit and the light-sensing sub circuit which use same signal lines, the display and the touch induction are achieved simultaneously.

Description

Pixel-driving circuit, array base palte and display device

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 embedded touch (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, it is characterized in that, comprising: data line, the first sweep trace, the second sweep trace, enable control line, 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, enable control line, power lead and luminescent device, at the first sweep trace, the second sweep trace, enable to drive described luminescent device luminescence display under the control of control line, data line and power lead;

Described light sensation electronic circuit connects described data line, the first sweep trace, the second sweep trace and enables control line, at the first sweep trace, the second sweep trace, enable touch sensitive action under the control of control line and data line.

Wherein, described light sensation electronic circuit comprises: signal detection line, the first memory capacitance, reset cell, induction of signal unit and signal sensing element;

Described in connecting, described reset cell enables the first end of control line and the first memory capacitance, for the signal of the first end of described the first memory capacitance of resetting under the control enabling control line;

Described induction of signal unit connects described data line, the first sweep trace and the first memory capacitance, for the light-sensing signal of data line signal and induction being write under the control at described the first sweep trace to described the first memory capacitance;

Described signal sensing element connects the second end and the second sweep trace and the signal detection line of described the first memory capacitance, for the signal of described the first memory capacitance storage being read out to described signal detection line under the control at described the second sweep trace.

Wherein, described reset cell comprises the 7th transistor, described in described the 7th transistorized grid connects, enables control line, and source electrode connects the first end of described the first memory capacitance, grounded drain, described the 7th transistor is used for the first end ground connection of described the first memory capacitance.

Wherein, described induction of signal unit comprises: the 8th transistor and light sensation transistor, described the 8th transistorized grid connects described the first sweep trace, source electrode connects described data line, drain electrode connects the first end of the transistorized source electrode of described light sensation and the first memory capacitance, described the 8th transistor under the control of described the first sweep trace to the first end data writing line signal of described the first memory capacitance; The transistorized grid of described light sensation connects the source electrode of self, and drain electrode connects the second end of described the first memory capacitance, and described light sensation transistor is used for responding to light-sensing signal, and writes the second end of described the first memory capacitance.

Wherein, described signal sensing element comprises: the 9th transistor, described the 9th transistorized grid connects described the second sweep trace, source electrode connects the second end of described the first memory capacitance, drain electrode connects described signal detection line, and described the 9th transistor for reading out to described signal detection line by the signal of described the first memory capacitance under the control of described the second sweep trace.

Wherein, described demonstration electronic circuit comprises: the second memory capacitance, reset unit, data write unit and luminous controling unit;

Described in described reset unit connects, enabling the first end of control line and the second memory capacitance, is low-voltage for the voltage of described the second memory capacitance first end that resets under the described control that enables control line;

Data write unit connects the second end, the first sweep trace and the driving transistors of described the second memory capacitance, for will comprising that the threshold voltage of described driving transistors and the information of data line voltage write the second end of described the second memory capacitance under the control at the first sweep trace;

Described luminous controling unit connects first end, driving transistors and the luminescent device of the second sweep trace, data line, power lead, the second memory capacitance, the grid of described driving transistors connects the second end of described the second memory capacitance, source electrode is connected described luminous controling unit with drain electrode, described luminous controling unit is data line voltage for make the first end of the second memory capacitance under the control of the second sweep trace, and keep the second memory capacitance two ends pressure reduction, and make driving transistors connecting power line, to drive described luminescent device luminous.

Wherein, described reset unit comprises the first transistor, described in the grid of described the first transistor connects, enables control line, and source electrode connects the first end of described the second memory capacitance, grounded drain; Described the first transistor is low-voltage for making the first end ground connection of described the second memory capacitance under the described control that enables control line, take to arrange the first end of described the second memory capacitance.

Wherein, described data write unit comprises: transistor seconds and the 3rd transistor, and the grid of described transistor seconds connects the first sweep trace, source electrode connection data line, drain electrode connects the source electrode of described driving transistors; Described the 3rd transistorized grid connects described the first sweep trace, and source electrode connects the drain electrode of driving transistors, and drain electrode connects the second end of described the second memory capacitance; Described transistor seconds and the 3rd transistor for forming path, comprising that the threshold voltage of described driving transistors and the information of data line voltage write the second end of described memory capacitance under the control of described the first sweep trace.

Wherein, described luminous controling unit comprises: the 4th transistor, the 5th transistor and the 6th transistor; Described the 4th transistorized grid connects described the second sweep trace, source electrode connecting power line, and drain electrode connects the source electrode of described driving transistors; Described the 5th transistorized grid connects described the second sweep trace, and source electrode connects the drain electrode of described driving transistors, and drain electrode connects described luminescent device; Described the 6th transistorized grid connects described the second sweep trace, and source electrode connects described data line, and drain electrode connects the first end of described the second memory capacitance; Described the 6th transistor under the control of described the second sweep trace data writing line voltage to the first end of memory capacitance, and make described memory capacitance two ends keep pressure reduction, described the 4th transistor and the 5th transistor for forming path under the control of described the second sweep trace, make described driving transistors connecting power line, to drive described luminescent device luminous.

Wherein, described luminescent device is Organic Light Emitting Diode, luminous controling unit 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 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 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, comprising: data line Data, the first sweep trace Scan[1], the second sweep trace Scan[2], enable control line EM, power lead S, luminescent device D, show electronic circuit 1 and light sensation electronic circuit 2.

Show electronic circuit 1 connection data line Data, the first sweep trace Scan[1], the second sweep trace Scan[2], enable control line EM, power lead S and luminescent device D, at the first sweep trace Scan[1], the second sweep trace Scan[2], enable to drive described luminescent device D luminescence display under the control of control line EM, data line Data and power lead S.

Light sensation electronic circuit 2 connection data line Data, the first sweep trace Scan[1], the second sweep trace Scan[2] and enable control line EM, at the first sweep trace Scan[1], the second sweep trace Scan[2], enable touch sensitive action under the control of control line EM and data line Data.

As shown in Figure 1, light sensation electronic circuit 2 comprises the concrete structure of the present embodiment:

Signal detection line Y.Read Line, the first memory capacitance C1, reset cell, induction of signal unit and signal sensing element.

Reset cell connects the first end enable control line EM and the first memory capacitance C1, for the signal of the first end of the first memory capacitance C1 that resets under the control enabling control line EM.

Induction of signal unit connection data line, the first sweep trace Scan[1] and the first memory capacitance C1, at the first sweep trace Scan[1] control under the light-sensing signal of data line signal and induction is write to described the first memory capacitance C1.

Signal sensing element connects the second end and the second sweep trace Scan[2 of the first memory capacitance C1] and signal detection line Y.Read Line (being longitudinal detection line), at the second sweep trace Scan[2] control under the signal of the first memory capacitance C1 storage is read out to signal detection line Y.Read Line.The second sweep trace Scan[2 herein] have horizontal detection line X.Read Line function (label Scan[2 in Fig. 1] line of & X.Read Line shown in representing be the second sweep trace Scan[2], also be horizontal detection line X.Read Line), by Y.Read Line and X.Read Line, finally determine the place that is touched.

In the present embodiment, reset cell comprises the 7th transistor M1.The grid connection of the 7th transistor M1 enables control line Em, and source electrode connects the first end of the first memory capacitance C1, grounded drain.The 7th transistor M1 is used for the first end ground connection of the first memory capacitance C1.

Induction of signal unit comprises: the 8th transistor M3 and light sensation transistor M2.The grid of the 8th transistor M3 connects the first sweep trace Scan[1], source electrode connection data line Data, drain electrode connects the source electrode of light sensation transistor M2 and the first end of the first memory capacitance C1, the 8th transistor M3 under the control of described the first sweep trace to the first end data writing line signal of the first memory capacitance C1.The grid of light sensation transistor M2 connects the source electrode of self, and drain electrode connects the second end of the first memory capacitance C1, and light sensation transistor M2 is used for responding to light-sensing signal, and writes the second end of described the first memory capacitance C1.

Signal sensing element comprises: the 9th transistor M4.The grid of the 9th transistor M4 connects the second sweep trace Scan[2], source electrode connects the second end of the first memory capacitance C1, and drain electrode connects signal detection line Y.Read Line.The 9th transistor M4 is at the second sweep trace Scan[2] control under the signal of the first memory capacitance C1 is read out to signal detection line Y.Read Line.Thereby finally determine according to signal detection line Y.Read Line and the second sweep trace X.Read Line the place that is touched.

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, reset unit, data write unit and luminous controling unit.

Reset unit connects the first end (being b point) that enables control line EM and the second memory capacitance C2, for the voltage of the second memory capacitance C2 first end that resets under the control enabling control line EM, is low-voltage.

Data write unit connects the second end (being a point), the first sweep trace Scan[1 of the second memory capacitance C2] and driving transistors DTFT, at the first sweep trace Scan[1] control under will comprise the threshold voltage V of driving transistors DTFT _thwith data line voltage V _datainformation write the second end of the second memory capacitance C2, now a point voltage is V _data-V _th.

Described luminous controling unit connects the second sweep trace Scan[2], first end, driving transistors DTFT and the luminescent device D of data line Data, power lead S, the second memory capacitance C2, the grid of driving transistors DTFT connects the second end of the second memory capacitance C2, and source electrode is connected luminous controling unit with drain electrode.Luminous controling unit is at the second sweep trace Scan[2] control under to make the first end of the second memory capacitance C2 be data line voltage V _data, and keep the second memory capacitance C2 two ends pressure reduction, and make driving transistors DTFT connecting power line S, to drive luminescent device D luminous.

In the pixel-driving circuit of the present embodiment, data write unit writes the second memory capacitance by the information of the threshold voltage of driving transistors and data line voltage, luminous controling unit is when control is luminous, the threshold voltage information threshold voltage of driving transistors when luminous that writes the driving transistors of the second memory capacitance compensates, solve pixel driving transistors due to manufacturing process and operated for a long time the inhomogenous problem of threshold voltage that causes, the electric current that makes to flow through each pixel luminescent device is not subject to the impact of threshold voltage, finally guaranteed the homogeneity that image shows.

In the present embodiment, reset unit comprises: the first transistor T1.The grid connection of the first transistor T1 enables control line Em, and source electrode connects the first end of the second memory capacitance C2, grounded drain.The first transistor T1 is low-voltage for making the first end ground connection of the second memory capacitance C2 under the control that enables control line Em, take to arrange the first end of the second memory capacitance C2.When Em is useful signal, T1 is by the first end ground connection of C, and B point voltage is 0.

In the present embodiment, data write unit comprises: transistor seconds T2 and the 3rd transistor T 3.The grid of transistor seconds T2 connects the first sweep trace Scan[1], source electrode connection data line Data, drain electrode connects the source electrode of driving transistors DTFT.The grid of the 3rd transistor T 3 connects the first sweep trace Scan[1], source electrode connects the drain electrode of driving transistors DTFT, and drain electrode connects the second end of the second memory capacitance C2.Transistor seconds DTFT and the 3rd transistor DTFT are at the first sweep trace Scan[1] control under formation path, comprising that the threshold voltage of driving transistors DTFT and the information of data line voltage write the second end of the second memory capacitance C2.

Specifically as shown in Figure 2, data write unit comprises: transistor seconds T2 and the 3rd transistor T 3.The grid of transistor seconds T2 connects the first sweep trace Scan[1], source electrode connection data line Data, drain electrode connects the source electrode of driving transistors DTFT.The grid of the 3rd transistor T 3 connects the first sweep trace Scan[1], source electrode connects the drain electrode of driving transistors DTFT, and drain electrode connects the second end of the second memory capacitance C2.As the first sweep trace Scan[1] effectively time, T2 and T3 open, and form path T2 → DTFT → T3, V _datasignal starts A point to charge by T2 → DTFT → T3, A point is charged to V always _data-V _thtill (pressure reduction meeting between the two poles of the earth, DTFT grid source is V _th), now the voltage at the second memory capacitance C2 two ends is also V _data-V _th.Due to the closing of T5, make the electric current in T2 → DTFT → T3 path can not pass through luminescent device in addition, indirectly reduced the life consumption of luminescent device.

In the present embodiment, luminous controling unit comprises: the 4th transistor T 4, the 5th transistor T 5 and the 6th transistor T 6.The grid of the 4th transistor T 4 connects the second sweep trace Scan[2], source electrode connecting power line S, drain electrode connects the source electrode of driving transistors DTFT.The grid of the 5th transistor T 5 connects the second sweep trace Scan[2], source electrode connects the drain electrode of driving transistors DTFT, and drain electrode connects luminescent device D.The grid of the 6th transistor T 6 connects the second sweep trace Scan[2], source electrode connection data line Data, drain electrode connects the first end of the second memory capacitance C2.The 6th transistor T 6 is at the second sweep trace Scan[2] control under the first end of data writing line voltage to the second memory capacitance C2, and make the second memory capacitance C2 two ends keep pressure reduction.The 4th transistor T 4 and the 5th transistor T 5 are at the second sweep trace Scan[2] control under formation path, make driving transistors DTFT connecting power line S, to drive luminescent device D luminous.

Specifically as shown in Figure 2, luminous controling unit comprises: the 4th transistor T 4, the 5th transistor T 5 and the 6th transistor T 6.The grid of the 4th transistor T 4 connects the second sweep trace Scan[2], source electrode connecting power line S, drain electrode connects the source electrode of driving transistors DTFT.The grid of the 5th transistor T 5 connects the second sweep trace Scan[2], source electrode connects the drain electrode of driving transistors DTFT, and drain electrode connects luminescent device D.The grid of the 6th transistor T 6 connects the second sweep trace Scan[2], source electrode connection data line Data, drain electrode connects the first end of the second memory capacitance C2.As the second sweep trace Scan[2] effectively time, T4, T5 and T6 open.Now B point voltage becomes V from original 0V _data, and A point is floating, therefore will maintain A, 2 original pressure reduction (V of B _data-V _th), can there is isobaric saltus step in the grid A point voltage of DTFT, and the saltus step of A point voltage is 2V _data-V _th.And now T4, driving transistors DTFT and T5 form path T4 → DTFT → T5, by the source electrode access power lead S of driving transistors DTFT, voltage is V _dd, it is luminous that electric current starts luminescent device D by T4 → DTFT → T5.

By driving transistors DTFT saturation current formula, can obtain (wherein, V _gSgate source voltage for DTFT):

I _D＝K(V _GS－V _th) ²＝K[V _dd－(2V _data－V _th)－V _th] ²＝K(V _dd－2V _data) ²

K = μ \cdot C_{ox} \frac{W}{L}

Wherein, μ is carrier mobility, C _oxfor gate oxide electric capacity, the breadth length ratio that W/L is driving transistors.

There is above-mentioned formula to find out, working current I _dbe not subject to V _thimpact, only and V _datarelevant.Thoroughly solved driving transistors DTFT due to manufacturing process and operated and cause threshold voltage (V for a long time _th) problem of drift, eliminate it to driving the electric current I of luminescent device _dimpact, guarantee the normal work of luminescent device.

In the present embodiment, luminescent device D can be Organic Light Emitting Diode (OLED), and the anodic bonding luminous controling unit of Organic Light Emitting Diode, specifically connects the drain electrode of the 5th transistor T 5, 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 a kind of driving method of above-mentioned pixel-driving circuit, and described demonstration electronic circuit 1 is at the first sweep trace Scan[1], the second sweep trace Scan[2], enable to drive luminescent device D luminescence display under the control of control line EM, data line Data and power lead S; And light sensation electronic circuit 2 is at the first sweep trace Scan[1], the second sweep trace Scan[2], enable touch sensitive action under the control of control line EM and data line Data.

Particularly, light sensation electronic circuit 2 comprises: signal detection line Y.Read Line, the first memory capacitance C1, reset cell, induction of signal unit and signal sensing element.Sense electronic circuit 2 is at the first sweep trace Scan[1], the second sweep trace Scan[2], the step that enables touch sensitive action under the control of control line EM and data line Data specifically comprises:

To enabling control line EM, apply enable signal, the signal of the first end of the first memory capacitance C1 so that reset cell is reset.

To the first sweep trace Scan[1] apply the first scanning useful signal, so that induction of signal unit writes described the first memory capacitance C1 by the light-sensing signal of data line signal and induction.

To the second sweep trace Scan[2] apply the second scanning useful signal, so that signal sensing element reads out to signal detection line Y.Read Line by the signal of the first memory capacitance C1 storage.

Particularly, induction of signal unit comprises: the 8th transistor M3 and light sensation transistor M2.The grid of the 8th transistor M3 connects the first sweep trace Scan[1], source electrode connection data line Data, drain electrode connects the source electrode of light sensation transistor M2 and the first end of the first memory capacitance C1.

Described to the first sweep trace Scan[1] apply the first scanning useful signal, so that the step that described induction of signal unit writes described the first memory capacitance C1 by the light-sensing signal of data line signal and induction specifically comprises:

To the first sweep trace Scan[1] apply the first scanning useful signal, the 8th transistor M3 opens, to the first end data writing line signal of the first memory capacitance C1; The grid of light sensation transistor M2 connects the drain electrode of M3, and data line voltage is opened M2, responds to light-sensing signal, and light-sensing signal is write to the second end of the first memory capacitance C1.

Particularly, described signal sensing element comprises: the 9th transistor M4, the grid of the 9th transistor M4 connects the second sweep trace Scan[2], source electrode connects the second end of described the first memory capacitance C1, and drain electrode connects signal detection line Y.Read Line.

Described to the second sweep trace Scan[2] apply the second scanning useful signal, so that the step that described signal sensing element reads out to described signal detection line Y.Read Line by the signal of the first memory capacitance C1 storage specifically comprises:

To the second sweep trace Scan[2] apply the second scanning useful signal, the 9th transistor M4 opens, and the signal of the first memory capacitance C1 is read out to signal detection line Y.Read Line.

Particularly, show that electronic circuit 1 comprises: the second memory capacitance C2, reset unit, data write unit and luminous controling unit.Described demonstration electronic circuit 1 is at the first sweep trace Scan[1], the second sweep trace Scan[2], enable to drive the step of luminescent device D luminescence display specifically to comprise under the control of control line EM, data line Data and power lead S:

To enabling control line Em, apply enable signal, so that reset unit is reset to low-voltage by the first end of the second memory capacitance C2.

To the first sweep trace Scan[1] apply the first scanning useful signal, so that data write unit will comprise that the threshold voltage of driving transistors DTFT and the information of data line voltage write the second end of described the second memory capacitance C2.

To the second sweep trace Scan[2] apply the second scanning useful signal, so that luminous controling unit writes data line voltage the first end of the second memory capacitance C2, and make the second memory capacitance C2 two ends keep pressure reduction, and make driving transistors DTFT connecting power line, to drive luminescent device D luminous.

Particularly, data write unit comprises: transistor seconds T2 and the 3rd transistor T 3.The grid of transistor seconds T2 connects the first sweep trace Scan[1], source electrode connection data line Data, drain electrode connects the source electrode of driving transistors DTFT.The grid of the 3rd transistor T 3 connects the first sweep trace Scan[1], source electrode connects the drain electrode of driving transistors DTFT, and drain electrode connects the second end of the second memory capacitance C2.

Described to the first sweep trace Scan[1] apply the first scanning useful signal, so that data write unit will comprise that the step that the threshold voltage of driving transistors DTFT and the information of data line voltage write the second end of the second memory capacitance C2 specifically comprises:

To the first sweep trace Scan[1] apply the first scanning useful signal, transistor seconds T2 and the 3rd transistor T 3 are opened, form path, comprising that the threshold voltage of driving transistors DTFT and the information of data line voltage write the second end of the second memory capacitance C2.

Particularly, described luminous controling unit comprises: the 4th transistor T 4, the 5th transistor T 5 and the 6th transistor T 6.The grid of the 4th transistor T 4 connects the second sweep trace Scan[2], source electrode connecting power line S, drain electrode connects the source electrode of driving transistors DTFT.The grid of the 5th transistor T 5 connects the second sweep trace Scan[2], source electrode connects the drain electrode of driving transistors DTFT, and drain electrode connects luminescent device D.The grid of the 6th transistor T 6 connects the second sweep trace Scan[2], source electrode connection data line Data, drain electrode connects the first end of the second memory capacitance C2.

Described to the second sweep trace Scan[2] apply the second scanning useful signal, so that luminous controling unit writes data line voltage the first end of the second memory capacitance C2, and make the second memory capacitance C2 keep two ends pressure reduction, and make driving transistors DTFT connecting power line, to drive the luminous concrete steps of luminescent device D to comprise:

To the second sweep trace Scan[2] apply the second scanning useful signal, the 6th transistor T 6 is opened, the first end of data writing line voltage to the second memory capacitance C2, and make the second memory capacitance C2 two ends keep pressure reduction, and the 4th transistor T 4 and the 5th transistor T 5 are opened, form path, make driving transistors DTFT connecting power line S, to drive luminescent device D luminous.

Below to above-mentioned pixel-driving circuit, the driving process that is the driving circuit in Fig. 1 is specifically described (wherein except light sensation transistor M2 is N-type transistor, all the other are P transistor npn npn), 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, in Fig. 2, Fig. 4 and Fig. 6, TFT in dotted line frame is the TFT of conducting, the current direction that dotted arrow is every one-phase).

As shown in Figures 2 and 3, in the sequential chart stage 1, now EM is effective.

For light sensation electronic circuit, M1 conducting, M2～M4 closes, and the first memory capacitance C1 and M2 ground connection is reset, for next stage light sensation work is prepared.

For showing electronic circuit, T1 conducting, T2, T3, T4, T5, T6 disconnect, and this process is by b point reset ground connection, and voltage is 0V, by the replacement that resets of voltage signal before.

As shown in Figures 4 and 5, sequential chart stages 2, the first sweep trace Scan[1] signal is effective.

For light sensation electronic circuit, M3 conducting, M2 grid source connects, output coupled voltages V _data, M2 is through self electromotive force conversion, and the potential difference (PD) that now C1 stores is definite value (voltage of C1 upper end is the induced voltage sum of data line voltage and M2, and lower end is data line voltage, so the pressure reduction of C1 is induced voltage).When there being touch (light touches or finger touch) unit extremely herein, the intensity of illumination that M2 receives changes, (if light touches, as laser pen irradiates, intensity of illumination increases in charging current variation, charging current increases, if finger touch, is equivalent to block light, intensity of illumination weakens, charging current reduces), for current signal fetch phase is prepared.

For showing that electronic circuit is the charging stage, now T2, T3 conducting, T1, T4, T5, T6 disconnect, V _datasignal starts a point to charge by T2 → DTFT → T3, A point is charged to V always _data-V _thtill (pressure reduction meeting between the two poles of the earth, DTFT grid source is V _th), in this process, because b point earthing potential is always 0, so after charging is complete, the voltage that a is ordered can maintain V always _data-V _th.Because closing of T5 makes electric current, can not pass through OLED in addition, indirectly reduce the life consumption of OLED.

As shown in Figures 6 and 7, sequential chart stages 3, the second sweep trace Scan[2] signal is effective.

For light sensation electronic circuit, for the read signal stage, now M1, M3 close, M4 opens, C1 → M4 → Y.Read Line forms current path, current signal is sent to the amplifier of signal detection line end by transferring to signal detection line Y.Read Line, the signal after amplification carries out data computational analysis to processor.So, there is touch-control action, strength of current before and after touch-control is changed to difference and predefinedly without touch-control threshold value, compares (if light touch current can become greatly, if finger touch electric current can diminish), judged whether according to this touch, so far, directions X coordinate is Scan[2 thus time] to determine, Y-direction coordinate is just determined by Y.read Line.

For showing electronic circuit, be the formal glow phase of OLED pixel, now T4, T5, T6 conducting, T2, T3, T1 disconnect.Now b point voltage becomes V from original 0V _data, and A point is floating, therefore will maintain a, 2 original pressure reduction (V of b _data-V _th), can there is isobaric saltus step in the grid a point voltage of DTFT, and the saltus step of a point voltage is 2V _data-V _th, glow phase DTFT source electrode connecting power line now, access power line voltage V _dd, it is luminous that electric current starts OLED by T4 → DTFT → T5.

I _OLED＝K(V _GS－V _th) ²＝K[V _dd－(2V _data－V _th)－V _th] ²＝K(V _dd－2V _data) ²

K = μ \cdot C_{ox} \frac{W}{L}

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

1. A pixel driving circuit, characterized in that it comprises: a data line, a first scanning line, a second scanning line, an enabling control line, a power supply line, a light emitting device, a display sub-circuit and a photosensitive sub-circuit;

The display sub-circuit is connected to the data line, the first scan line, the second scan line, the enable control line, the power supply line and the light emitting device, and is used to connect the first scan line, the second scan line, the enable control line, the data line Drive the light-emitting device to emit light and display under the control of the power line;

The photosensitive sub-circuit is connected to the data line, the first scan line, the second scan line and the enable control line, and is used for controlling the first scan line, the second scan line, the enable control line and the data line Sensing touch action.

2. The pixel driving circuit according to claim 1, wherein the photosensitive sub-circuit comprises: a signal detection line, a first storage capacitor, a reset unit, a signal sensing unit, and a signal readout unit;

The reset unit is connected to the enable control line and the first end of the first storage capacitor, and is used to reset the signal at the first end of the first storage capacitor under the control of the enable control line;

The signal sensing unit is connected to the data line, the first scan line and the first storage capacitor, and is used to write the data line signal and the sensed photosensitive signal into the first storage capacitor under the control of the first scan line. capacitance;

The signal readout unit is connected to the second terminal of the first storage capacitor and the second scan line and the signal detection line, and is used to read the signal stored in the first storage capacitor under the control of the second scan line. out to the signal sense line.

3. The pixel driving circuit according to claim 2, wherein the reset unit comprises a seventh transistor, the gate of the seventh transistor is connected to the enable control line, and the source is connected to the first The drain of the first terminal of the storage capacitor is grounded, and the seventh transistor is used to ground the first terminal of the first storage capacitor.

4. The pixel driving circuit according to claim 2, wherein the signal sensing unit comprises: an eighth transistor and a photosensitive transistor, the gate of the eighth transistor is connected to the first scanning line, and the source is connected to The drain of the data line is connected to the source of the phototransistor and the first end of the first storage capacitor, and the eighth transistor is used to provide data to the first storage capacitor under the control of the first scan line. The first end of the first end writes the data line signal; the gate of the phototransistor is connected to its own source, and the drain is connected to the second end of the first storage capacitor, and the phototransistor is used to sense the photosensitive signal. And write to the second end of the first storage capacitor.

5. The pixel driving circuit according to claim 2, wherein the signal readout unit comprises: a ninth transistor, the gate of the ninth transistor is connected to the second scanning line, and the source is connected to the The drain of the second end of the first storage capacitor is connected to the signal detection line, and the ninth transistor is used to read the signal of the first storage capacitor to the signal under the control of the second scan line. Test line.

6. The pixel drive circuit according to any one of claims 1 to 5, wherein the display sub-circuit comprises: a second storage capacitor, a reset unit, a data writing unit, and a light emission control unit;

The reset unit is connected to the enable control line and the first end of the second storage capacitor, and is used to reset the voltage at the first end of the second storage capacitor to a low voltage under the control of the enable control line;

The data writing unit is connected to the second terminal of the second storage capacitor, the first scanning line and the driving transistor, and is used to write information including the threshold voltage of the driving transistor and the voltage of the data line under the control of the first scanning line. into the second terminal of the second storage capacitor;

The light emission control unit is connected to the second scanning line, the data line, the power line, the first end of the second storage capacitor, the driving transistor and the light emitting device, and the gate of the driving transistor is connected to the second end of the second storage capacitor , the source and the drain are connected to the light emission control unit, and the light emission control unit is used to make the first terminal of the second storage capacitor be the voltage of the data line under the control of the second scan line, and keep the two ends of the second storage capacitor and connect the driving transistor to the power line to drive the light emitting device to emit light.

7. The pixel driving circuit according to claim 6, wherein the reset unit comprises a first transistor, the gate of the first transistor is connected to the enable control line, and the source is connected to the second memory The first end of the capacitor, the drain is grounded; the first transistor is used to ground the first end of the second storage capacitor under the control of the enable control line, so as to set the first end of the second storage capacitor One end is low voltage.

8. The pixel driving circuit according to claim 6, wherein the data writing unit comprises: a second transistor and a third transistor, the gate of the second transistor is connected to the first scanning line, and the source is connected to A data line, the drain of which is connected to the source of the driving transistor; the gate of the third transistor is connected to the first scan line, the source of which is connected to the drain of the driving transistor, and the drain is connected to the first storage capacitor of the second storage capacitor. Two terminals; the second transistor and the third transistor are used to form a path under the control of the first scanning line, so as to write information including the threshold voltage of the driving transistor and the voltage of the data line into the storage capacitor second end.

9. The pixel driving circuit according to claim 6, wherein the light emission control unit comprises: a fourth transistor, a fifth transistor and a sixth transistor; the gate of the fourth transistor is connected to the second scanning line, the source is connected to the power line, the drain is connected to the source of the driving transistor; the gate of the fifth transistor is connected to the second scanning line, the source is connected to the drain of the driving transistor, and the drain is connected to the The light-emitting device; the gate of the sixth transistor is connected to the second scan line, the source is connected to the data line, and the drain is connected to the first end of the second storage capacitor; the sixth transistor is used for Writing the voltage of the data line to the first end of the storage capacitor under the control of the second scan line, and keeping the voltage difference between the two ends of the storage capacitor, the fourth transistor and the fifth transistor are used for the second A path is formed under the control of the scanning line, so that the driving transistor is connected to the power line, so as to drive the light emitting device to emit light.

10. The pixel driving circuit according to claim 6, wherein the light-emitting device is an organic light-emitting diode, an anode of the organic light-emitting diode is connected to the light-emitting control unit, and a cathode is grounded.

11. An array substrate, comprising the pixel driving circuit according to any one of claims 1-10.

12. A display device, comprising the array substrate according to claim 11.