CN106875892B - A kind of pixel circuit and its driving method, display device - Google Patents

A kind of pixel circuit and its driving method, display device Download PDF

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Publication number
CN106875892B
CN106875892B CN201710114594.2A CN201710114594A CN106875892B CN 106875892 B CN106875892 B CN 106875892B CN 201710114594 A CN201710114594 A CN 201710114594A CN 106875892 B CN106875892 B CN 106875892B
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signal
control
end
light emitting
pole
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CN201710114594.2A
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Chinese (zh)
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CN106875892A (en
Inventor
杨盛际
董学
吕敬
陈小川
刘冬妮
王磊
付杰
卢鹏程
岳晗
肖丽
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京东方科技集团股份有限公司
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Abstract

A kind of pixel circuit, it include: light emitting control module, light sensation regulation module and light emitting module, wherein, the light sensation regulates and controls module, it is connect respectively with adjustment signal end, the first potential end and the light emitting control module, the light sensation regulation module is used to receive the illumination of the light emitting module, and the signal of first potential end is supplied to the light emitting control module under the control for generating corresponding electric signal and the adjustment signal end according to intensity of illumination signal;The light emitting control module, it is connect respectively with LED control signal end, light sensation regulation module and the light emitting module, the light emitting control module is used to control the light emitting module under the control for the signal that the LED control signal end and light sensation regulation module provide and shine, this programme can be shone with period intermittent adjusting light emitting module, alleviate EL material send out strong light caused by light-emitting device life period reduction.

Description

A kind of pixel circuit and its driving method, display device

Technical field

The present embodiments relate to but be not limited to field of display technology, it is espespecially a kind of pixel circuit and its driving method, aobvious Showing device.

Background technique

Active matrix organic light-emitting diode (Active-Matrix Organic Light Emitting Diode, letter Claim AMOLED) be current flat-panel monitor research field one of hot spot, compared with liquid crystal display, OLED (Organic Light-Emitting Diod, Organic Light Emitting Diode) there is low low energy consumption, production cost, self-luminous, wide viewing angle and response The advantages that speed is fast, currently, in mobile phone, PDA (Personal Digital Assistant, personal digital assistant), digital phase The display fields such as machine OLED, which has begun, replaces traditional LCD (Liquid Crystal Display, liquid crystal display) display Screen.

In conventional OLED display device, the material of RGB (RGB) vapor deposition is distinguishing, the luminous spy of different materials Property is also not quite similar, therefore the luminescent lifetime of RGB is also different, so the effective light emitting region RGB is same, nevertheless, Due to for example, strong light efficiency is shown for a long time, the service life of big lossy OLED under specific display condition.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of pixel circuit and its driving methods, display device, to alleviate EL (electroluminescent material) material send out light strong caused by light-emitting device life period reduce.

A kind of pixel circuit, comprising: light emitting control module, light sensation regulation module and light emitting module, wherein

The light sensation regulates and controls module, connect respectively with adjustment signal end, the first potential end and the light emitting control module, institute Light sensation regulation module is stated to be used to receive the illumination of the light emitting module, according to intensity of illumination signal generate corresponding electric signal and The signal of first potential end is supplied to the light emitting control module under the control at the adjustment signal end;

The light emitting control module regulates and controls module and the light emitting module with LED control signal end, the light sensation respectively Connection, the control for the signal that the light emitting control module is used to provide at the LED control signal end and light sensation regulation module The system lower control light emitting module shines.

Optionally, the light sensation regulation module includes: the first reset cell, the second storage unit, regulates and controls unit and light sensation Unit, wherein

First reset cell is connect with the first scanning signal end, the second potential end and second node respectively, is used for The signal of second potential end is supplied to the second node under the control at first scanning signal end;

Second storage unit is connected with the second node and first potential end respectively;Second storage Unit is for carrying out charge or discharge under the control of the signal of the signal and second potential end of the second node;

The photo cell is connect with the second node and cold end respectively, and the photo cell is for receiving institute The illumination for stating light emitting module changes the current potential of the second node according to illumination intensity information;

The regulation unit respectively with the second node, the first potential end, the adjustment signal end and the luminous control The connection of molding block, the regulation unit are electric by described first according to the second node and the control of the signal at the adjustment signal end The signal at position end is supplied to the light emitting control module.

Optionally, first reset cell includes the 9th switching transistor, wherein

The control electrode of 9th switching transistor is connect with first scanning signal end, the 9th switching transistor The first pole connect with second potential end, the second pole of the 9th switching transistor is connect with the second node.

Second storage unit includes the second capacitor, wherein

Second capacitance connection is between second potential end and the second node.

The photo cell includes: photodiode, wherein

The anode of the photodiode is connect with the second node, the cathode of the photodiode and the low electricity The connection of position end.

Optionally, the regulation unit includes: the 7th switching transistor and the 8th switching transistor, wherein

The control electrode of 7th switching transistor is connect with the adjustment signal end, and the of the 7th switching transistor One pole is connect with the second pole of the 8th switching transistor, the second pole of the 7th switching transistor and the light emitting control Module connection;

The control electrode of 8th switching transistor is connect with the second node, and the first of the 8th switching transistor Pole is connect with first potential end, the second pole of the 8th switching transistor and the first pole of the 7th switching transistor Connection.

Optionally, the light emitting control module includes: the second reset cell, the first storage unit, compensating unit, driving crystalline substance Body pipe, data write unit, the first luminous controling unit and the second luminous controling unit, wherein

Second reset cell is connect with first scanning signal end, initializing signal end and first node respectively, For the signal at the initializing signal end to be supplied to the first node under the control at first scanning signal end;

First storage unit is connected with the first node and third potential end respectively;First memory module Charge or discharge are carried out under the control of signal for signal and the third potential end in the first node;

The compensating unit respectively with it is described driving transistor control electrode, it is described driving transistor the second pole and second The connection of scanning signal end, the compensating unit under the control at second scanning signal end for being connected the driving transistor Control electrode and it is described driving transistor the second pole;

It is described driving transistor control electrode connect with the first node, it is described drive transistor the first pole respectively with The data write unit is connected with first luminous controling unit;

The data write unit respectively with the second scanning signal end, data signal end and the driving transistor the One is extremely connected;The data write unit be used under the control at second scanning signal end by the driving transistor with The signal of the data signal end is supplied to the first node by the compensating unit;

First luminous controling unit respectively with the LED control signal end, the third potential end and the driving First pole of transistor connects, for the first of the driving transistor to be connected under the control at the LED control signal end Pole;

Second luminous controling unit respectively with the LED control signal end, it is described driving transistor the second pole and The light emitting module connection, for the second pole of the driving transistor to be connected under the control at the LED control signal end, The light emitting module is controlled to shine.

Optionally, second reset cell includes first switch transistor, wherein

The control electrode of the first switch transistor is connect with first scanning signal end, the first switch transistor The first pole connect with the initializing signal end, the second pole of the first switch transistor is connected with the first node.

First storage unit includes first capacitor, wherein

The first capacitor is connected between the first node and the third potential end;

The compensating unit includes second switch transistor, wherein

The control electrode of the second switch transistor is connect with second scanning signal end, the second switch transistor The first pole connect with the control electrode of the driving transistor, the second pole of the second switch transistor and the driving crystal Second pole of pipe connects;

The data write unit includes the 5th switching transistor, wherein

The control electrode of 5th switching transistor is connect with second scanning signal end, the 5th switching transistor The first pole and the data signal end, the second of the 5th switching transistor extremely it is described driving transistor the first pole connect It connects;

First luminous controling unit includes the 4th switching transistor, and second luminous controling unit is opened including the 6th Close transistor, wherein

The control electrode of 4th switching transistor is connect with the LED control signal end, the 4th switching transistor The first pole connect with second potential end, the second pole of the 4th switching transistor and it is described driving transistor first Pole connection;

The control electrode of 6th switching transistor and the LED control signal end and light sensation regulation module connect, First pole of the 6th switching transistor is connect with the second pole of the driving transistor, and the of the 6th switching transistor Two poles are connect with the light emitting module;

The light emitting module includes Organic Light Emitting Diode, the anode of the Organic Light Emitting Diode and the light emitting control Module connection, the cathode of the Organic Light Emitting Diode are connect with cold end.

Optionally, the driving transistor is P-type transistor,

All switching transistors are P-type transistor, and the first extremely source electrode in the P-type transistor, second extremely drains.

A kind of display panel, including above-mentioned pixel circuit.

A kind of driving method of pixel circuit, the pixel circuit are above-mentioned pixel circuit, comprising:

The light sensation regulation module receives the illumination of the light emitting module, is generating corresponding electricity according to intensity of illumination signal The signal of first potential end is supplied to the light emitting control module under the control at signal and the adjustment signal end;

The control for the signal that the light emitting control module provides at the LED control signal end and light sensation regulation module The system lower control light emitting module shines.

Optionally, the driving method includes:

First stage, first reset cell is under the control at first scanning signal end by second potential end Signal be supplied to the second node, signal and first weight of second storage unit in the second node It sets and charges under the control of the signal of unit;Second reset cell is under the control at first scanning signal end by institute The signal for stating initial signal end is supplied to the first node, signal and institute of first storage unit in the first node It states and discharges under the control of the signal of third potential end;

Second stage, the photo cell receive the illumination of light emitting module, change described second according to intensity of illumination signal The current potential of node, second storage unit is under the control of the signal of the second node and the signal of second potential end Electric discharge;The data write unit passes through the driving transistor and the compensation under the control of second scan signal line The difference of the signal of the data signal end and the threshold voltage of the driving transistor is supplied to the first node by unit, First storage unit charges under the signal of the first node and the control of the signal of the third potential end;

Phase III, first luminous controling unit and second luminous controling unit are in the LED control signal Under the control at end, the signal of the third potential end is accessed by the first pole and the second pole of the driving transistor, controls institute Light emitting module is stated to shine;

Fourth stage, control of the regulation unit in the signal of the second node and the signal at the adjustment signal end The lower signal by first potential end is supplied to the second switch control unit, and the second switch control unit is described It is closed under the control of the signal of the signal at switch control signal end and first potential end, controls the light emitting module and do not send out Light.

To sum up, the embodiment of the present invention provides a kind of pixel circuit and its driving method, display device, can be intermittent with the period Light emitting module is adjusted to shine, alleviate EL material send out strong light caused by light-emitting device life period reduction.

Detailed description of the invention

Fig. 1 is the schematic diagram of the pixel circuit of the embodiment of the present invention one;

Fig. 2 is the schematic diagram of the pixel circuit of the embodiment of the present invention two;

Fig. 3 is the schematic diagram of the pixel circuit of the embodiment of the present invention three;

Fig. 4 is a kind of flow chart of the driving method of pixel circuit of the embodiment of the present invention;

Fig. 5 is the timing diagram of the embodiment of the present invention;

Fig. 6 A is the opening and closing schematic diagram of pixel circuit each transistor in the first stage of the present embodiment;

Fig. 6 B is the opening and closing schematic diagram of pixel circuit each transistor in the first stage of the present embodiment;

Fig. 6 C is the opening and closing schematic diagram of pixel circuit each transistor in the first stage of the present embodiment;

Fig. 6 D is the opening and closing schematic diagram of pixel circuit each transistor in the first stage of the present embodiment.

Specific embodiment

To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application Feature can mutual any combination.

Embodiment one

The present embodiment provides a kind of pixel circuit as shown in Figure 1, the pixel circuit of the present embodiment includes: light sensation regulation module 10, light emitting control module 20 and light emitting module 30, wherein

Light sensation regulates and controls module 10, connect respectively with adjustment signal end EM1, the first potential end VGH and light emitting control module 20, Light sensation regulation module 10 is used to receive the illumination of light emitting module 30, is generating corresponding electric signal and tune according to intensity of illumination signal It controls and the signal of the first potential end VGH is supplied to light emitting control module 20 under the control of signal end EM1;

Light emitting control module 20 is connect with LED control signal end EM, light sensation regulation module 10 and light emitting module 30 respectively, Light emitting control module 20 is used under the control of LED control signal end EM and light sensation regulation module 10 signal provided control to send out Optical module 30 shines.

The present embodiment is on the basis of OLED backboard process, production reversal connection PN section (PIN), and the group of PIN becomes P+doping → a + Si Doping → N+Doping process, PIN section is below EL luminescent device, and in the present embodiment, i.e., integrated light sensation regulates and controls mould Block directly acquires the pixel light emission state, this design can be allowed to be effectively relieved by period intermittent adjustment effect EL material send out light strong caused by OLED service life reduction the problem of.

Embodiment two

As shown in Fig. 2, light sensation regulation module 10 includes: the first reset cell 11, the second storage unit 12 in the present embodiment, Regulate and control unit 13 and photo cell 14, wherein

First reset cell 11 connects with the first scanning signal end Scan1, the second potential end Vcom and second node N2 respectively It connects, for the signal of the second potential end Vcom to be supplied to second node N2 under the control of the first scanning signal end Scan1;

Second memory module 12 is connected with second node N2 and the second potential end Vcom respectively;Second memory module 12 is used Charge or discharge are carried out under the control in the signal of second node N2 and the signal of the second potential end Vcom;

Photo cell 14 is connect with second node N2 and cold end Vss respectively, and photo cell 14 is luminous for receiving The illumination of module 30 changes the current potential of second node N2 according to illumination intensity information;

Regulate and control unit 13 respectively with second node N2, the first potential end VGH, adjustment signal end EM1 and light emitting control module 20 connections, regulation unit 13 are controlled according to the signal of second node N2 and adjustment signal end EM1 by the signal of the first potential end VGH It is supplied to light emitting control module 20.

Wherein, the second potential end Vcom access is high level signal, and the first potential end VGH access is high level letter Number.

Light emitting control module 20 includes: the second reset cell 21, the first storage unit 22, compensating unit 23, driving crystal Pipe 24, data write unit 25, the first luminous controling unit 26 and the second luminous controling unit 27, wherein

Second reset cell 21 respectively with the first scanning signal end Scan1, initializing signal end Vinit and first node N1 Connection, for the signal of initializing signal end Vinit to be supplied to first node under the control of the first scanning signal end Scan1 N1;

First storage unit 22 is connected with first node N1 and third potential end Vdd respectively;First memory module 22 is used Charge or discharge are carried out under the control of the signal of signal and third potential end Vdd in first node N1;

Compensating unit 23 is believed with the control electrode of driving transistor 24, the second pole of driving transistor 24 and the second scanning respectively Number end Scan2 connection, compensating unit 23 under the control of the second scanning signal end Scan2 conducting drive transistor 24 control Second pole of pole processed and driving transistor 24;

The control electrode of driving transistor 24 is connect with first node N1, and the first pole of driving transistor 24 is write with data respectively Enter unit 25 and the connection of the first luminous controling unit 26;

Data write unit 25 respectively with the second scanning signal end Scan2, data signal end Vdata and driving transistor The first of 24 is extremely connected;Data write unit 25 is used under the control of the second scanning signal end Scan2 through driving transistor 24 and compensating unit 23 signal of data signal end Vdata is supplied to first node N1;

First luminous controling unit 26 respectively with LED control signal end EM, third potential end Vdd and driving transistor 24 The first pole connection, under the control of LED control signal end EM conducting driving transistor 24 the first pole;

Second luminous controling unit 27 respectively with LED control signal end EM, drive transistor 24 the second pole and luminous mould Block 30 connects, and for the second pole of the conducting driving transistor 24 under the control of LED control signal end EM, controls light emitting module 30 shine.

Wherein, initializing signal end Vinit access is low level signal, and third potential end Vdd access is high level Signal.

When light emitting module 30 shines for a long time, photo cell 14 can acquire the illumination of light emitting module 30, work as intensity of illumination When excessively high, photo cell 14 is the current potential that can change second node N2, and then drives and open regulation unit 13, and regulation unit 13 is again Selectively a specified level signal is exported to the second light emitting control of light emitting control module 20 under the control of adjustment signal Unit 27, and then control light emitting module 30 and shine, reach period intermittent adjustment effect.

Embodiment three

In the specific implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, as shown in Figure 3:

Second reset cell 21 includes first switch transistor M1, wherein the control electrode of first switch transistor M1 and the First pole of the Scan1 connection of scan signal end, first switch transistor M1 is connect with initializing signal end Vinit, and first opens The second pole for closing transistor M1 is connected with first node N1.

First storage unit 22 includes first capacitor C1, wherein first capacitor C1 is connected to first node N1 and third electricity Between the end Vdd of position.

Compensating unit 23 includes second switch transistor M2, wherein the control electrode of second switch transistor M2 is swept with second Signal end Scan2 connection is retouched, the first pole of second switch transistor M2 is connect with the control electrode of driving transistor M3, second switch The second pole of transistor M2 is connect with the second pole of driving transistor 24.

Data write unit 25 includes the 5th switching transistor M5, wherein the control electrode of the 5th switching transistor M5 and the Two scanning signal end Scan2 connections, the first pole of the 5th switching transistor M5 and data signal end Vdata, the 5th switch crystal The second pole of pipe M5 is connect with the first pole of driving transistor M3.

First luminous controling unit 26 includes the 4th switching transistor M4, and the second luminous controling unit 27 includes the 6th switch Transistor M6, wherein

The control electrode of 4th switching transistor M4 is connect with LED control signal end EM, and the first of the 4th switching transistor M4 Pole is connect with third potential end Vdd, and the second pole of the 4th switching transistor M4 is connect with the first pole of driving transistor M3;

The 7th in control electrode and LED control signal end EM and light sensation the regulation module 10 of 6th switching transistor M6 is brilliant The second pole connection of body pipe M7, the first pole of the 6th switching transistor M6 are connect with the second pole of driving transistor 24, and the 6th opens The second pole for closing transistor M6 is connect with light emitting module 30.

First reset cell 11 includes the 9th switching transistor M9, wherein the control electrode of the 9th switching transistor M9 and the The Scan1 connection of scan signal end, the first pole of the 9th switching transistor M9 are connect with the second potential end Vcom, and the 9th switch is brilliant The second pole of body pipe M9 is connect with second node N2.

Second storage unit 12 includes the second capacitor C2, wherein the second capacitor C2 is connected to the first potential end Vcom and the Between two node N2.

The photo cell 14 includes: photodiode, wherein the anode and second node N2 of the photodiode connect It connects, the cathode of the photodiode is connect with the cold end.

Regulating and controlling unit 13 includes: the 7th switching transistor M7 and the 8th switching transistor M8, wherein

The control electrode of 7th switching transistor M7 is connect with adjustment signal end EM1, the first pole of the 7th switching transistor M7 It is connect with the second pole of the 8th switching transistor M7, the in the second pole of the 7th switching transistor M7 and light emitting control module 20 The control electrode of six switching transistor M6 connects;

The control electrode of 8th switching transistor M8 is connect with second node N2, the first pole of the 8th switching transistor M8 and institute The first potential end VGH connection is stated, the second pole of the 8th switching transistor M8 is connect with the first pole of the 7th switching transistor M9.

Light emitting module 30 includes Organic Light Emitting Diode (OLED), the anode and light emitting control module of Organic Light Emitting Diode The second pole connection of the 6th switching transistor M6, the cathode of the Organic Light Emitting Diode are connect with cold end in 20.

In order to simplify the fabrication processing of pixel-driving circuit, in the specific implementation, provided in an embodiment of the present invention In above-mentioned pixel circuit, as shown in figure 3, driving transistor M3 is P-type transistor, the first extremely source electrode in the P-type transistor, Second extremely drains, and all switching transistors can be p-type switching transistor, the first extremely source in the P-type transistor Pole, second extremely drains.

It will also be understood that the M1-M9 in the present embodiment is also not limited to thin film transistor (TFT), it is any that there is voltage control Ability processed so that the present invention should be included within the scope of the present invention according to the control device of above-mentioned mode of operation, Those skilled in the art can be changed according to actual needs, and details are not described herein again.

In the specific implementation, in above-mentioned pixel circuit provided in an embodiment of the present invention, p-type switching transistor is in high potential The lower cut-off of effect, is connected under low potential effect.

It should be noted that driving transistor and switch in above-mentioned pixel-driving circuit provided in an embodiment of the present invention Transistor can be thin film transistor (TFT) (Thin Film Transistor, abbreviation TFT), be also possible to metal-oxide semiconductor (MOS) Field-effect tube (Metal Oxide Scmiconductor, abbreviation MOS), is not limited thereto.In the specific implementation, these are opened Close grid of the control electrode as switching transistor of transistor, and these switching transistors according to switching transistor type and The difference of the signal of signal end, can be using the first pole as the source electrode of switching transistor or drain electrode, and using the second pole as opening Drain electrode or the source electrode for closing transistor, are not limited thereto.It is to drive transistor and open and when describing specific embodiment Transistor is closed to be illustrated for thin film transistor (TFT).

A kind of driving method of pixel circuit of the embodiment of the present invention, comprising:

The light sensation regulation module receives the illumination of the light emitting module, is generating corresponding electricity according to intensity of illumination signal The signal of first potential end is supplied to the light emitting control module under the control at signal and the adjustment signal end;

The control for the signal that the light emitting control module provides at the LED control signal end and light sensation regulation module The system lower control light emitting module shines.

The present embodiment is on the basis of OLED backboard process, production reversal connection PN section (PIN), and the group of PIN becomes P+doping → a + Si Doping → N+Doping process, PIN section is below EL luminescent device, and in the present embodiment, i.e., integrated light sensation regulates and controls mould Block directly acquires the pixel light emission state, this design can be allowed to be effectively relieved by period intermittent adjustment effect EL material send out light strong caused by OLED service life reduction the problem of.

Fig. 4 is a kind of flow chart of the driving method of pixel circuit of the embodiment of the present invention, as shown in Figure 4, comprising: first Stage, second stage, phase III and fourth stage are as follows:

S401, first stage, first reset cell is under the control at first scanning signal end by described second The signal of potential end is supplied to the second node, second storage unit the second node signal with it is described It charges under the control of the signal of first reset cell;Control of second reset cell at first scanning signal end The lower signal by the initial signal end is supplied to the first node, letter of first storage unit in the first node Number with discharge under the control of the signal of the third potential end;

S402, second stage, the photo cell receive illumination, change the second node according to intensity of illumination signal Current potential, second storage unit are discharged under the signal of the second node and the control of the signal of second potential end; The data write unit passes through the driving transistor and the compensating unit under the control of second scan signal line The signal of the data signal end is supplied to the first node, signal of first storage unit in the first node It charges under control with the signal of first potential end;

S403, phase III, first luminous controling unit and second luminous controling unit are in the luminous control Under the control of signal end processed, the signal for accessing the third potential end passes through the first pole and the second pole of the driving transistor, The light emitting module is controlled to shine;

S404, fourth stage, the regulation unit is in the signal of the second node and the signal at the adjustment signal end Control under the signal of first potential end is supplied to the second switch control unit, the second switch control unit It is closed under the control of the signal of the signal and first potential end at the switch control signal end, controls the light emitting module It does not shine.

Below by taking pixel circuit shown in Fig. 3 as an example, combined circuit timing diagram is to above-mentioned picture provided in an embodiment of the present invention The course of work of plain circuit is described.High potential is indicated with 1 in described below, and 0 indicates low potential.It should be noted that 1 He 0 is logic level, merely to preferably explain the specific work process of the embodiment of the present invention, rather than in the specific implementation The current potential being applied in the control electrode of each switching transistor.

Below for timing diagram shown in fig. 5, each process of above-mentioned pixel circuit is explained one by one:

T1 in the first stage, Scan1=0, Scan2=1, EM=1, EM1=1, Vdata=0.

Fig. 6 A is the opening and closing schematic diagram of pixel circuit each transistor in the first stage of the present embodiment.Wherein, "×" represents Transistor cutoff, no "×" represent transistor turns, and path and arrow represent current direction.Fig. 6 B, Fig. 6 C and 6D are in second-order "×" meaning is identical as Fig. 6 A in the opening and closing signal of each transistor in section, phase III and fourth stage pixel circuit.Wherein:

At this point, as shown in Figure 6A, due to Scan1=0, first switch transistor M1 and the 9th switching transistor M9 are led It is logical;Since Scan2=1, second switch transistor M2 and the 5th switching transistor M5 end;Due to EM=1, the 4th Switching transistor M4 and the 6th switching transistor M6 cut-off;Since EM1=1, the 7th switching transistor M7 end.

The signal of initializing signal end Vinit is supplied to the grid of driving transistor M3 by the first switch transistor M1 of conducting Pole is connect the resetting of N1 point with the current potential for the signal that the grid resetting electric discharge to driving transistor M3 is initializing signal end Vinit Ground, potential Vint, the voltage signal before being allowed to are reset.

The signal of potential end Vcom is supplied to second node N2 by the 9th switching transistor M9 of conducting, at this time by the second electricity The second node N2 for holding C2 right end is reset, voltage Vcom, and second node N2 is in high potential, therefore the 8th switch at this time Transistor M8 cut-off.

In second stage T2, Scan1=1, Scan2=0, EM=1, EM1=1, Vdata=1.

At this point, as shown in Figure 6B, since Scan1=1, first switch transistor M1 and the 9th switching transistor M9 are cut Only;Since Scan2=0, second switch transistor M2 and the 5th switching transistor M5 are connected;Due to EM=1, the 4th Switching transistor M4 and the 6th switching transistor M6 cut-off;Since EM1=1, the 7th switching transistor M7 end.

At this time if there is strong illumination PN is saved, then second node N2 potential reduces, and second node N2 potential is with light at this time Change according to intensity size, here it is worth noting that the light characteristics of PN section are can be by the doping condition of adjusting PIN Come what is changed, i.e., when only reaching high strong illumination, reduced voltage is just able to satisfy leading for the 8th switching transistor M8 Gating condition.

Since in the first stage, first node N1 connects low potential, so driving DTFT M3 is opened, VdataSignal passes through M5 → M3 → M2 starts to charge to first node N1, and first node N1 is charged to V alwaysdata–VthUntil (meet DTFT Pressure difference between the two poles of the earth of M3 grid source is Vth), after charging finishes, the current potential of first node N1 can maintain always Vdata–Vth

In phase III T3, Scan1=1, Scan2=1, EM=0, EM1=1, Vdata=0.

At this point, as shown in Figure 6 C, since Scan1=1, first switch transistor M1 and the 9th switching transistor M9 are cut Only;Since Scan2=1, second switch transistor M2 and the 5th switching transistor M5 end;Due to EM=0, the 4th Switching transistor M4 and the 6th switching transistor M6 conducting;Since EM1=1, the 7th switching transistor M7 end.

At this point, the potential of the source electrode of third switching transistor M3 accesses Vdd, electric current generates photoelectric current by M4 → M3 → M6 So that OLED device starts to shine.

It is available by TFT saturation current formula: I=K (VGS–Vth)2

=K [Vdd–(Vdata–Vth)–Vth]2

=K (Vdd–Vdata)2

By can see in above formula, operating current I is not by source follower TFT V at this timethInfluence, only and VddWith VdataIt is related.Source follower TFT is thoroughly solved since manufacturing process and prolonged operation cause threshold voltage (Vth) to drift about The problem of, guarantee the accuracy of signal data.

Size by generating photoelectric current is directly determined by the Vdata size in formula, if that device is for a long time Work certainly will will lead to the reduction of OLED device luminescent lifetime, so that the performance of product is influenced, and PN junction is formed by tune at this time Voltage processed is latched in always second node N2.

In fourth stage T3, Scan1=1, Scan2=1, EM=0, EM1=0, Vdata=0.

At this point, as shown in Figure 6 D, since Scan1=1, first switch transistor M1 and the 9th switching transistor M9 are cut Only;Since Scan2=1, second switch transistor M2 and the 5th switching transistor M5 end;Due to EM=0, the 4th Switching transistor M4 and the 6th switching transistor M6 conducting;Since EM1=0, the 7th switching transistor M7 are connected.

When EM1 modulated signal is changed into low potential by high point, M8 is connected in the low potential of second node N2 at this time, VGH high level and the at this time low potential of EM signal are superimposed to form a high potential, end the 6th switching transistor M6, so that existing OLED current OLED device at this time can not be closed by anode, achieve the effect that brightness is adjusted.

In conclusion pixel circuit provided in this embodiment, can be effectively relieved EL material send out light strong caused by the OLED longevity The problem of life reduces.

The embodiment of the invention also provides a kind of display panels, including above-mentioned pixel circuit provided in an embodiment of the present invention. The principle that the display panel solves the problems, such as is similar to aforementioned pixel circuit, therefore the implementation of the display panel may refer to aforementioned picture The implementation of plain circuit, repeating place, details are not described herein.

In the specific implementation, as luminescent device be OLED when, display panel provided in an embodiment of the present invention can be organic Electroluminescence display panel.

In the specific implementation, display panel provided in an embodiment of the present invention can be with are as follows: mobile phone, tablet computer, television set, aobvious Show any products or components having a display function such as device, laptop, Digital Frame, navigator.For the display panel Other essential component parts be it will be apparent to an ordinarily skilled person in the art that having, this will not be repeated here, Also it should not be taken as limiting the invention.

Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be instructed by program Related hardware is completed, and described program can store in computer readable storage medium, such as read-only memory, disk or CD Deng.Optionally, one or more integrated circuits can be used also to realize in all or part of the steps of above-described embodiment.Accordingly Ground, each module/unit in above-described embodiment can take the form of hardware realization, can also use the shape of software function module Formula is realized.The present invention is not limited to the combinations of the hardware and software of any particular form.

The above is only a preferred embodiment of the present invention, and certainly, the invention may also have other embodiments, without departing substantially from this In the case where spirit and its essence, those skilled in the art make various corresponding changes in accordance with the present invention And deformation, but these corresponding changes and modifications all should fall within the scope of protection of the appended claims of the present invention.

Claims (9)

1. a kind of pixel circuit characterized by comprising light emitting control module, light sensation regulation module and light emitting module, wherein
The light sensation regulates and controls module, connect respectively with adjustment signal end, the first potential end and the light emitting control module, the light Sense regulation module is used to receive the illumination of the light emitting module, is generating corresponding electric signal and described according to intensity of illumination signal The signal of first potential end is supplied to the light emitting control module under the control at adjustment signal end;The light sensation regulates and controls mould Block includes: the first reset cell, the second storage unit, regulates and controls unit and photo cell, wherein
First reset cell is connect with the first scanning signal end, the second potential end and second node respectively, for described The signal of second potential end is supplied to the second node under the control at the first scanning signal end;
Second storage unit is connected with the second node and second potential end respectively;Second storage unit Charge or discharge are carried out under the control of signal for signal and second potential end in the second node;
The photo cell is connect with the second node and cold end respectively, and the photo cell is for receiving the hair The illumination of optical module changes the current potential of the second node according to illumination intensity information;
The regulation unit respectively with the second node, first potential end, the adjustment signal end and the luminous control The connection of molding block, the regulation unit are electric by described first according to the second node and the control of the signal at the adjustment signal end The signal at position end is supplied to the light emitting control module;
The light emitting control module is connect with LED control signal end, light sensation regulation module and the light emitting module respectively, The light emitting control module is used under the control for the signal that the LED control signal end and light sensation regulation module provide The light emitting module is controlled not shine.
2. pixel circuit as described in claim 1, which is characterized in that first reset cell includes the 9th switch crystal Pipe, wherein
The control electrode of 9th switching transistor is connect with first scanning signal end, and the of the 9th switching transistor One pole is connect with second potential end, and the second pole of the 9th switching transistor is connect with the second node;
Second storage unit includes the second capacitor, wherein
Second capacitance connection is between second potential end and the second node;
The photo cell includes: photodiode, wherein
The anode of the photodiode is connect with the second node, the cathode of the photodiode and the cold end Connection.
3. pixel circuit as described in claim 1, which is characterized in that the regulation unit include: the 7th switching transistor and 8th switching transistor, wherein
The control electrode of 7th switching transistor is connect with the adjustment signal end, the first pole of the 7th switching transistor It is connect with the second pole of the 8th switching transistor, the second pole of the 7th switching transistor and the light emitting control module Connection;
The control electrode of 8th switching transistor is connect with the second node, the first pole of the 8th switching transistor with The first potential end connection, the second pole of the 8th switching transistor and the first pole of the 7th switching transistor connect It connects.
4. pixel circuit as described in claim 1, which is characterized in that the light emitting control module include: the second reset cell, First storage unit, compensating unit, driving transistor, data write unit, the first luminous controling unit and the second light emitting control Unit, wherein
Second reset cell is connect with first scanning signal end, initializing signal end and first node respectively, is used for The signal at the initializing signal end is supplied to the first node under the control at first scanning signal end;
First storage unit is connected with the first node and third potential end respectively;First memory module is used for Charge or discharge are carried out under the control of the signal of the signal and third potential end of the first node;
The compensating unit is scanned with the control electrode of the driving transistor, the second pole of the driving transistor and second respectively Signal end connection, the compensating unit are used to be connected the control of the driving transistor under the control at second scanning signal end Second pole of pole processed and the driving transistor;
It is described driving transistor control electrode connect with the first node, it is described drive transistor the first pole respectively with it is described Data write unit is connected with first luminous controling unit;
The data write unit respectively with the second scanning signal end, data signal end and it is described driving transistor the first pole It is connected;The data write unit is used under the control at second scanning signal end through the driving transistor and described The signal of the data signal end is supplied to the first node by compensating unit;
First luminous controling unit respectively with the LED control signal end, the third potential end and the driving crystal First pole of pipe connects, for the first pole of the driving transistor to be connected under the control at the LED control signal end;
Second luminous controling unit respectively with the LED control signal end, driving second pole of transistor and described Light emitting module connection, for the second pole of the driving transistor, control to be connected under the control at the LED control signal end The light emitting module shines.
5. pixel circuit as claimed in claim 4, which is characterized in that second reset cell includes first switch crystal Pipe, wherein
The control electrode of the first switch transistor is connect with first scanning signal end, and the of the first switch transistor One pole is connect with the initializing signal end, and the second pole of the first switch transistor is connected with the first node;
First storage unit includes first capacitor, wherein
The first capacitor is connected between the first node and the third potential end;
The compensating unit includes second switch transistor, wherein
The control electrode of the second switch transistor is connect with second scanning signal end, and the of the second switch transistor One pole is connect with the control electrode of the driving transistor, the second pole of the second switch transistor and the driving transistor The connection of second pole;
The data write unit includes the 5th switching transistor, wherein
The control electrode of 5th switching transistor is connect with second scanning signal end, and the of the 5th switching transistor One pole and the data signal end, the first pole connection of the extremely described driving transistor of the second of the 5th switching transistor;
First luminous controling unit includes the 4th switching transistor, and second luminous controling unit includes that the 6th switch is brilliant Body pipe, wherein
The control electrode of 4th switching transistor is connect with the LED control signal end, and the of the 4th switching transistor One pole is connect with second potential end, and the first pole of the second pole of the 4th switching transistor and the driving transistor connects It connects;
The control electrode of 6th switching transistor connect with the LED control signal end and light sensation regulation module, is described First pole of the 6th switching transistor is connect with the second pole of the driving transistor, the second pole of the 6th switching transistor It is connect with the light emitting module;
The light emitting module includes Organic Light Emitting Diode, the anode of the Organic Light Emitting Diode and the light emitting control module Connection, the cathode of the Organic Light Emitting Diode are connect with cold end.
6. pixel circuit as described in claim 4 or 5, which is characterized in that
The driving transistor is P-type transistor,
All switching transistors are P-type transistor, and the first extremely source electrode in the P-type transistor, second extremely drains.
7. a kind of display panel, which is characterized in that including pixel circuit as claimed in any one of claims 1 to 6.
8. a kind of driving method of pixel circuit, the pixel circuit is such as described in any item pixel circuits of claim 4-6, It is characterised by comprising:
The light sensation regulation module receives the illumination of the light emitting module, is generating corresponding electric signal according to intensity of illumination signal The signal of first potential end is supplied to the light emitting control module under control with the adjustment signal end;
The light emitting control module is under the control for the signal that the LED control signal end and light sensation regulation module provide The light emitting module is controlled to shine.
9. driving method as claimed in claim 8, which is characterized in that the driving method includes:
First stage, first reset cell is under the control at first scanning signal end by the letter of second potential end It number is supplied to the second node, second storage unit is single in the signal of the second node and first resetting It charges under the control of the signal of member;Second reset cell will be described first under the control at first scanning signal end The signal of beginning signal end is supplied to the first node, and first storage unit is in the signal of the first node and described the It discharges under the control of the signal of three potential ends;
Second stage, the photo cell receives illumination, changes the current potential of the second node according to intensity of illumination signal, described Second storage unit is discharged under the signal of the second node and the control of the signal of second potential end;The data are write Enter unit under the control of second scan signal line by the driving transistor and the compensating unit by the data The difference of the threshold voltage of the signal of signal end and the driving transistor is supplied to the first node, and first storage is single Member charges under the signal of the first node and the control of the signal of the third potential end;
Phase III, first luminous controling unit and second luminous controling unit are at the LED control signal end Under control, the signal of the third potential end is accessed by the first pole and the second pole of the driving transistor, controls the hair Optical module shines;
Fourth stage, the regulation unit will under the control of the signal of the second node and the signal at the adjustment signal end First potential end and LED control signal endlap add the signal to be formed to be supplied to second luminous controling unit, and described Two luminous controling units are closed under the control that the LED control signal end and first potential end are superimposed the signal to be formed, The light emitting module is controlled not shine.
CN201710114594.2A 2017-02-28 2017-02-28 A kind of pixel circuit and its driving method, display device CN106875892B (en)

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