CN104813390B

CN104813390B - Method and system for driving an active matrix display circuit

Info

Publication number: CN104813390B
Application number: CN201380060382.0A
Authority: CN
Inventors: 阿罗基亚·内森; 戈尔拉玛瑞扎·恰吉
Original assignee: Ignis Innovation Inc
Current assignee: Ignis Innovation Inc
Priority date: 2012-10-11
Filing date: 2013-10-02
Publication date: 2017-04-12
Anticipated expiration: 2033-10-02
Also published as: EP2907128A1; EP2907128A4; WO2014057397A1; CN104813390A

Abstract

A method and system for driving an active matrix display is provided. The system includes a drive circuit for a pixel having a light emitting device. The drive circuit includes a drive transistor for driving the light emitting device. The system includes a mechanism for adjusting the gate voltage of the drive transistor.

Description

System and method for driving active matrix display circuit

Technical field

The present invention relates to luminescent device, more specifically, is related to what the image element circuit with luminescent device was driven System and method.

Background technology

Electroluminescent display has been developed and has been widely used in the plurality of devices such as mobile phone.Especially, with amorphous Silicon (a-Si), polysilicon, it is organic or other drive backboards active matrix organic light-emitting diode (AMOLED) display because Its feasible Flexible Displays, low manufacturing cost, high-resolution and wide viewing angle etc. advantage and become more noticeable.

The array of the row and column of displayer including pixel and the backboard electricity being arranged in the array of the row and column Sub-line road, each pixel has Organic Light Emitting Diode (OLED).Because OLED is current drive-type device, AMOLED Image element circuit accurate and constant driving current should be provided.

Need to provide following system and method：The system and method can be provided with high-precision constant luminance, And the aging effect and backboard of image element circuit and the unstability of luminescent device can be reduced.

The content of the invention

It is an object of the invention to provide eliminating or having relaxed the side of at least one of the above-mentioned inferior position of existing system inferior position Method and system.

According to an aspect of the present invention, it is proposed that a kind of system, display system, it includes the pixel with luminescent device Drive circuit used.The drive circuit includes being connected to the driving transistor of the luminescent device.Driving transistor includes Gate terminal, the first terminal and Second terminal.Drive circuit includes with gate terminal, the first terminal and Second terminal first Transistor, the gate terminal of the first transistor is connected to selection line, and the first terminal of the first transistor is connected to data wire and The Second terminal of one transistor is connected to the gate terminal of driving transistor.Drive circuit is included for the grid to driving transistor The circuit that pole tension is adjusted, the circuit for adjusting is included with gate terminal, the first terminal and Second terminal Discharge transistor, the gate terminal of discharge transistor is connected to the gate terminal of driving transistor at node, brilliant by discharging Body pipe discharges the voltage of the node.Drive circuit includes the storage with the first terminal and Second terminal, The first terminal of storage is connected to the gate terminal of driving transistor at the node.

The display system can include array of display and the driver for driving array of display, array of display have with Multiple image element circuits that the mode of ranks is arranged, each image element circuit includes drive circuit.The gate terminal of transistor seconds It is connected to offset line.Offset line can be shared by more than one image element circuit in multiple image element circuits.

According to a further aspect of the invention, it is proposed that a kind of method for display system.The display system includes For the driver that every a line provides programming cycle, compensation cycle and drive cycle.The method comprising the steps of：In the first row Programming cycle, programming data is simultaneously supplied to the first row by the address wire for selecting the first row；In the compensation cycle of the first row, select Neighbor address line for second row adjacent with the first row and disable the address wire of the first row；And in the driving of the first row In the cycle, disable the neighbor address line.

According to a further aspect of the invention, it is proposed that a kind of display system, it includes one or more pixel electricity Road, each image element circuit includes luminescent device and drive circuit.Drive circuit is included with gate terminal, the first terminal and The driving transistor of two-terminal, driving transistor is located between the luminescent device and the first power supply.The drive circuit includes Switching transistor with gate terminal, the first terminal and Second terminal, the gate terminal of switching transistor is connected to the first ground Location line, the first terminal of switching transistor are connected to data wire and the Second terminal of switching transistor is connected to driving transistor Gate terminal.Drive circuit includes the circuit for being adjusted to the grid voltage of driving transistor, described in adjusting Circuit includes sensor and discharge transistor, and the sensor is used for energy transmission of the sensing from the image element circuit, described The characteristic that sensor has the first terminal and Second terminal, the sensor changes according to sensing outcome, the electric discharge crystal Pipe has gate terminal, the first terminal and Second terminal, and the gate terminal of the discharge transistor is connected to the second address wire, institute The first terminal for stating discharge transistor is connected to the gate terminal of driving transistor and the of the discharge transistor at node Two-terminal is connected to the first terminal of the sensor.The drive circuit includes the storage with the first terminal and Second terminal Capacitor, the first terminal of storage is connected to the gate terminal of driving transistor at the node.

According to a further aspect of the invention, it is proposed that a kind of method for display system, methods described includes implementing In pixel the step of compensation.

According to a further aspect of the invention, it is proposed that a kind of method for display system, methods described includes implementing In panel the step of compensation.

According to a further aspect of the invention, it is proposed that a kind of method for display system, the system includes having The image element circuit of sensor, methods described includes the step of reading back to sensor aging.

According to a further aspect of the invention, it is proposed that a kind of display system, it includes：Array of display, the display battle array Row include the multiple image element circuits arranged in the way of ranks, and each image element circuit includes luminescent device and drive circuit；With For driving the drive system of array of display.The drive circuit is included with gate terminal, the first terminal and Second terminal Driving transistor, the driving transistor is located between the luminescent device and the first power supply.The drive circuit includes having The first transistor of gate terminal, the first terminal and Second terminal, the gate terminal of the first transistor is connected to address wire, The first terminal of the first transistor is connected to data wire and the Second terminal of the first transistor is connected to the driving The gate terminal of transistor.The drive circuit includes the circuit for being adjusted to the voltage of the driving transistor, uses Include transistor seconds in the circuit for adjusting, the transistor seconds has gate terminal, the first terminal and Second terminal, The gate terminal of the transistor seconds is connected to control line, and the first terminal of the transistor seconds is connected to the driving crystalline substance The gate terminal of body pipe.The drive circuit includes the storage with the first terminal and Second terminal, the storage electricity The first terminal of container is connected to the gate terminal of the driving transistor.The drive system drive the image element circuit so that The image element circuit is disconnected in a part of frame time.

According to a further aspect of the invention, it is proposed that a kind of for the display system with array of display and drive system Method.The drive system is provided with programming cycle, discharge cycle, light period, reset cycle and relaxation for every a line The frame time in cycle.The method comprising the steps of：In programming cycle, by starting the picture for capable address wire to the row Plain circuit is programmed；In discharge cycle, by making the address wire for being directed to row invalid and starting the control line for row, to drive Voltage on the gate terminal of dynamic transistor is partly discharged；In light period, make the control line for row invalid, and it is logical Cross the driving transistor to control luminescent device；In the reset cycle, drive crystalline substance described in the control pair for row by starting Voltage on the gate terminal of body pipe is discharged；And in relaxaton period, make the control line for row invalid.

Description of the drawings

From following explanation referring to the drawings, these and other features of the invention will become more obvious.

Fig. 1 illustrates the example of the image element circuit of the pixel drive scheme for applying according to embodiments of the present invention.

Fig. 2 illustrates another example of the image element circuit of the drive circuit with Fig. 1.

Fig. 3 is the sequential chart of the example of the driving method of image element circuit according to embodiments of the present invention.

Fig. 4 illustrates the example of the display system of the drive circuit of Fig. 1 and Fig. 2.

Fig. 5 illustrates the example of the image element circuit for applying pixel drive scheme in accordance with another embodiment of the present invention.

Fig. 6 illustrates another example of the drive circuit of Fig. 5.

Fig. 7 illustrates another example of the drive circuit of Fig. 5.

Fig. 8 illustrates another example of the image element circuit of the drive circuit with Fig. 5.

Fig. 9 is the sequential chart of the example of the driving method of image element circuit in accordance with another embodiment of the present invention.

Figure 10 illustrates the example of the display system of the drive circuit for Fig. 5 and Fig. 8.

Figure 11 illustrates the example of the display system of the drive circuit for Fig. 6 and Fig. 7.

Figure 12 be a diagram that the curve chart of the simulation result of the image element circuit of Fig. 1.

Figure 13 illustrates the example of the image element circuit for applying the pixel drive scheme according to another embodiment of the invention.

Figure 14 illustrates another example of the image element circuit of the drive circuit with Figure 13.

Figure 15 is the sequential chart of the example of the driving method of the image element circuit according to another embodiment of the invention.

Figure 16 illustrates the example of the display system of the drive circuit for Figure 13 and Figure 14.

Figure 17 be a diagram that the curve chart of the simulation result of the image element circuit of Fig. 5.

Figure 18 be a diagram that the curve chart of the simulation result of the image element circuit of Fig. 5.

Figure 19 is the sequential chart of the operation of the display system of Figure 16.

Figure 20 illustrates the example of the image element circuit for applying the pixel drive scheme according to another embodiment of the invention.

Figure 21 illustrates another example of the image element circuit of the drive circuit with Figure 20.

Figure 22 be a diagram that the sequential chart of the example of the driving method of the image element circuit according to another embodiment of the invention.

Figure 23 illustrates the example of the display system of the drive circuit for Figure 20 and Figure 21.

Figure 24 illustrates another example of the display system of the drive circuit for Figure 20 and Figure 21.

Figure 25 illustrates the example of pixel system according to embodiments of the present invention.

Figure 26 illustrates the example of the display system of the circuit that reads back with Figure 25.

Figure 27 illustrates another example of the display system of the circuit that reads back with Figure 25.

Figure 28 be a diagram that the sequential chart of the example of the driving method of the image element circuit according to another embodiment of the invention.

Figure 29 illustrates the example of the aging extracting method of the sensor of Figure 25.

Figure 30 illustrates the example of pixel system in accordance with another embodiment of the present invention.

Figure 31 illustrates the example of the display system of the circuit that reads back with Figure 30.

Figure 32 illustrates another example of the display system of the circuit that reads back with Figure 30.

Figure 33 be a diagram that the sequential chart of the example of the driving method of the image element circuit according to another embodiment of the invention.

Figure 34 be a diagram that the sequential chart of another example of the aging extracting method of the sensor of Figure 30.

Figure 35 be a diagram that showing for the image element circuit for applying the pixel drive scheme according to another embodiment of the invention Example.

Figure 36 is the sequential chart of the example of the driving method of the image element circuit according to another embodiment of the invention.

Figure 37 illustrates the example of the display system of the image element circuit with Figure 35.

Figure 38 illustrates another example of the display system of the image element circuit with Figure 35.

Figure 39 illustrates the example of the image element circuit for applying pixel drive scheme in accordance with another embodiment of the present invention.

Figure 40 illustrates the example of the image element circuit for applying the pixel drive scheme according to another embodiment of the invention.

Figure 41 illustrates the example of the image element circuit for applying pixel drive scheme in accordance with another embodiment of the present invention.

Specific embodiment

Fig. 1 illustrates the example of the image element circuit of the pixel drive scheme for applying according to embodiments of the present invention.The picture of Fig. 1 Plain circuit 100 includes OLED 102 and the drive circuit 104 for driving OLED 102.Drive circuit 104 includes driving crystal Pipe 106, discharge transistor 108, switching transistor 110 and storage 112.OLED 102 for example include anode, negative electrode with And luminescent layer between the anode and the cathode.

In the following description, it is interchangeably used " image element circuit " and " pixel ".In the following description, can be mutual Use with changing " signal " and " circuit ".In the following description, term " circuit " and " node " can be interchangeably used.Saying In bright, term " selection line " and " address wire " can be interchangeably used.In the following description, can be interchangeably used " connection (or being connected) " and " engagement (or engaged) ", and they may be used to indicate that two or more elements directly with one another Or physical contact or electrical contact indirectly.

In one example, transistor 106,108 and 110 is n-type transistor.In another example, transistor 106, 108 and 110 is p-type transistor, or the combination of n-type transistor and p-type transistor.In one example, transistor 106,108 and 110 include gate terminal, source terminal and drain terminal.

Transistor 106,108 and 110 can use non-crystalline silicon, nanometer/microcrystal silicon, polysilicon, organic semiconductor technologies (example Such as, organic tft), NMOS/PMOS technologies or CMOS technology (for example, MOSFET) to be manufacturing.

Driving transistor 106 is arranged between voltage supply line VDD and OLED 102.One end of driving transistor 106 Son is connected to VDD.Another terminal of driving transistor 106 is connected to an electrode (for example, anode electrode) of OLED 102. One terminal of discharge transistor 108 and the gate terminal of discharge transistor 108 are connected to driving transistor 106 at node A1 Gate terminal.Another terminal of discharge transistor 108 is connected to OLED 102.The gate terminal of switching transistor 110 connects It is connected to selection line SEL.One terminal of switching transistor 110 is connected to data wire VDATA.Switching transistor 110 another Terminal is connected to node A1.One terminal of storage 112 is connected to node A1.Another end of storage 112 Son is connected to OLED 102.Another electrode (for example, cathode electrode) of OLED 102 is connected to power line and (for example, shares and connect Ground) 114.

As described below, image element circuit 100 is permanent in frame time to provide by adjusting the grid voltage of driving transistor 106 Fixed average current.

Fig. 2 illustrates another example of the image element circuit of the drive circuit 104 with Fig. 1.Image element circuit 130 and Fig. 1 Image element circuit 100 be similar to.Image element circuit 130 includes OLED 132.OLED 132 can or class identical with the OLED 102 of Fig. 1 Seemingly.In image element circuit 130, driving transistor 106 is arranged on an electrode (for example, cathode electrode) and power supply of OLED 132 Between line (for example, sharing ground connection) 134.One terminal of discharge transistor 138 and the terminal connection of storage 112 To power line 134.Another electrode (for example, anode electrode) of OLED 132 is connected to VDD.

With the similar mode of image element circuit 100 with Fig. 1, image element circuit 130 provides constant average electricity in frame time Stream.

Fig. 3 illustrates the example of the driving method of image element circuit according to embodiments of the present invention.The waveform of Fig. 3 puts on tool Have the drive circuit 104 of Fig. 1 and Fig. 2 image element circuit (for example, Fig. 1 100, Fig. 2 130).

The operation cycle of Fig. 3 includes programming cycle 140 and drive cycle 142.Referring to figs. 1 to Fig. 3, in programming cycle 140 Interior, when selection line SEL is high level, node A1 is charged to program voltage by switching transistor 110.In drive cycle In 142, node A1 is discharged by discharge transistor 108.Because driving transistor 106 and discharge transistor 108 have Identical bias condition, so they experience identical threshold voltage shift.It is discharge transistor 108 in view of discharge time The function of mutual conductance, when the threshold voltage of the discharge transistor 108 of driving transistor 106/ increases, discharge time increases.Therefore, as (average current 130) in frame time of 100, Fig. 2 of Fig. 1 keeps constant to element.In this example, discharge transistor is very weak Transistor, with short width (W) and long channel length (L).Width (W) can be according to different from the ratio of length (L) Situation and change.

Additionally, in the image element circuit 130 of Fig. 2, the increase of the OLED voltage of OLED 132 causes longer discharge time. Therefore, even if after OLED deteriorations, mean pixel electric current will also keep constant.

Fig. 4 illustrates the example of the display system of the drive circuit for Fig. 1 and Fig. 2.The display system 1000 of Fig. 4 includes Array of display 1002 with multiple pixels 1004.Pixel 1004 includes the drive circuit 104 of Fig. 1 and Fig. 2, and can be Fig. 1 Image element circuit 100 or Fig. 2 image element circuit 130.

Array of display 1002 is that active matrix light-emitting shows.In one example, array of display 1002 is that AMOLED shows Array.Array of display 1002 can be monochromatic, polychrome or full-color display, and can include one or more electroluminescent (EL) element (for example, organic EL).Array of display 1002 can be used for mobile device, personal digital assistant (PDA), computer show Show device or mobile phone.

Array of display 1002 is provided with selection line SELi, SELi+1 and data wire VDATAj, VDATAj+1.Each selection line SELi, SELi+1 are corresponding with the SEL of Fig. 1 and Fig. 2.The VDATA phases of each data wire VDATAj, VDATAj+1 and Fig. 1 and Fig. 2 Correspondence.Pixel 1004 is arranged in the way of ranks.Colleague's pixel in array of display 1002 shares selection line (SELi, SELi+ 1).Same column pixel shared data line (VDATAj, VDATAj+1) in array of display 1002.

In fig. 4 it is shown that four pixels 1004.However, the quantity of pixel 1004 can be different according to system design, It is not limited to four.In fig. 4 it is shown that two selection lines and two data lines.However, the quantity of selection line and data wire can With different according to system design, however it is not limited to two.

Gate drivers 1006 drive SELi and SELi+1.Gate drivers 1006 could be for providing address signal To the address driver of address wire (for example, selection line).Data driver 1008 produce programming data and drive VDATAj and DATAj+1.Controller 1010 controls driver 1006 and 1008 so that they drive as described above pixel 1004.

Fig. 5 illustrates the example of the image element circuit for applying pixel drive scheme in accordance with another embodiment of the present invention. The image element circuit 160 of Fig. 5 includes OLED 162 and the drive circuit 164 for driving OLED 162.Drive circuit 164 includes Driving transistor 166, discharge transistor 168, first switch transistor 170 and second switch transistor 172 and storage capacitance Device 174.

Image element circuit 160 is similar with the image element circuit 130 of Fig. 2.The drive circuit 104 of drive circuit 164 and Fig. 1 and Fig. 2 It is similar.Transistor 166,168 and 170 is corresponding with transistor 106,108 and 110 of Fig. 1 and Fig. 2 respectively.Transistor 166,168 Can be same or like with transistor 106,108 and 110 of Fig. 1 and Fig. 2 with 170.Storage 174 is deposited with Fig. 1's and Fig. 2 Storing up electricity container 112 is corresponding.Storage 174 can be same or like with the storage 112 of Fig. 1 and Fig. 2.OLED 162 is corresponding with the OLED 132 of Fig. 2.OLED 162 can be same or like with the OLED 132 of Fig. 2.

In one example, switching transistor 172 is n-type transistor.In another example, switching transistor 172 is p Transistor npn npn.In one example, transistor 166,168,170 and 172 includes gate terminal, source terminal and drain electrode end Son.

Transistor 166,168,170 and 172 can use non-crystalline silicon, nanometer/microcrystal silicon, polysilicon, organic semiconductor skill Art (for example, organic tft), NMOS/PMOS technologies or CMOS technology (for example, MOSFET) are manufacturing.

In image element circuit 160, switching transistor 172 and discharge transistor 168 are connected in series in driving transistor 166 Between gate terminal and power line (for example, sharing ground connection) 176.The gate terminal of switching transistor 172 is connected to bias voltage Line VB.The gate terminal of discharge transistor 168 is connected to the gate terminal of driving transistor at node A2.Driving transistor 166 are arranged on an electrode (for example, cathode electrode) of OLED 162 and power line 176 between.The grid of switching transistor 170 Terminal is connected to SEL.One terminal of switching transistor 170 is connected to VDATA.Another terminal of switching transistor 170 connects It is connected to node A2.One terminal of storage 174 is connected to node A2.Another terminal connection of storage 174 To power line 176.

As described below, image element circuit 160 is provided permanent in frame time by adjusting the grid voltage of driving transistor 166 Fixed average current.

In one example, bias voltage line VB of Fig. 5 can be shared by the pixel of whole panel.In another example In, as shown in fig. 6, bias voltage line VB can be connected to node A2.The image element circuit 160A of Fig. 6 includes drive circuit 164A. Drive circuit 164A is similar with the drive circuit 164 of Fig. 5.However, in drive circuit 164A, the grid of switching transistor 172 Terminal is connected to node A2.In another example, as shown in fig. 7, the switching transistor 172 of Fig. 5 can be substituted with resistance. The image element circuit 160B of Fig. 7 includes drive circuit 164B.Drive circuit 164B is similar with the drive circuit 164 of Fig. 5.However, In drive circuit 164B, resistance 178 and discharge transistor 168 are connected in series between node A2 and power line 176.

Fig. 8 illustrates another example of the image element circuit of the drive circuit 164 with Fig. 5.Image element circuit 190 and Fig. 5 Image element circuit 160 be similar to.Image element circuit 190 includes OLED 192.OLED 192 can or class identical with the OLED 162 of Fig. 5 Seemingly.In image element circuit 190, driving transistor 166 is arranged on an electrode (for example, anode electrode) and VDD of OLED 192 Between.One terminal of discharge transistor 168 and a terminal of storage 174 are connected to OLED 192.OLED 192 Another electrode (for example, cathode electrode) be connected to power line (for example, share ground connection) 194.

In one example, the pixel of whole panel shares bias voltage line VB of Fig. 8.In another example, such as with As Fig. 6 is similar, bias voltage line VB of Fig. 8 is connected to node A2.In another example, as similar with Fig. 7, The switching transistor 172 of Fig. 8 is substituted by resistance.

With the similar mode of image element circuit 160 with Fig. 5, image element circuit 190 provides constant average electricity in frame time Stream.

Fig. 9 illustrates the example of the driving method of image element circuit in accordance with another embodiment of the present invention.The waveform of Fig. 9 is applied Be added on the drive circuit 164 with Fig. 5 and Fig. 8 image element circuit (for example, 160, Fig. 8 of Fig. 5 190).

The operation cycle of Fig. 9 includes programming cycle 200 and drive cycle 202.With reference to Fig. 5, Fig. 8 and Fig. 9, in programming cycle In 200, when SEL is high level, node A2 is charged to program voltage (Vp) by switching transistor 170.In drive cycle In 202, node A2 is discharged by discharge transistor 168.Because driving transistor 166 and discharge transistor 168 have Identical bias condition, so they experience identical threshold voltage shift.It is discharge transistor 168 in view of discharge time The function of mutual conductance, when the threshold voltage of the discharge transistor 168 of driving transistor 166/ increases, discharge time increases.Therefore, as (average current 190) in frame time of 160, Fig. 8 of Fig. 5 keeps constant to element.Here, switching transistor 172 is forced and put Electric transistor 168 enters linear operating region, and reduces feedback oscillator with this.Therefore, discharge transistor 168 can be had most The unit transistor (unity transistor) of small channel length and width.The width and length of unit transistor is technology institute The minima of permission.

Additionally, in the image element circuit 190 of Fig. 8, the increase of the OLED voltage of OLED 192 causes longer discharge time. Therefore, even if after OLED deteriorations, mean pixel electric current will also keep constant.

Figure 10 illustrates the example of the display system of the drive circuit for Fig. 5 and Fig. 8.The display system 1020 of Figure 10 is wrapped Include the array of display 1022 with multiple pixels 1024.Pixel 1024 includes the drive circuit 164 of Fig. 5 and Fig. 8, and can be figure 5 image element circuit 130 or the image element circuit 190 of Fig. 8.

Array of display 1022 is active matrix light-emitting display.In one example, array of display 1022 is that AMOLED shows Show array.Array of display 1022 can be monochromatic, polychrome or full-color display, and can include one or more EL elements (for example, organic EL).Array of display 1022 can be used for mobile device, PDA, computer display or mobile phone.

Each selection line SELi and SELi+1 are corresponding with the SEL of Fig. 5 and Fig. 8.VB is corresponding with the VB of Fig. 5 and Fig. 8.Respectively Individual data wire VDATAj and VDATAj+1 is corresponding with the VDATA of Fig. 5 and Fig. 8.Pixel 1024 is arranged in the way of ranks.Aobvious The pixel for showing concurrence in array 1022 shares selection line (SELi, SELi+1).The pixel of same column is shared in array of display 1022 Data wire (VDATAj, VDATAj+1).I-th row and (i+1) row pixel share bias voltage line VB.In another example, VB can be shared by whole array 1022.

In fig. 10 it is shown that four pixels 1024.However, the quantity of pixel 1024 can be according to system design not Together, however it is not limited to four.In fig. 10 it is shown that two selection lines and two data lines.However, the number of selection line and data wire Amount can be different according to system design, however it is not limited to two.

Gate drivers 1026 drive SELi and SELi+1 and VB.Gate drivers 1026 can be included for by address Signal is supplied to the address driver of array of display 1022.Data driver 1028 produce programming data and drive VDATAj and VDATAj+1.Controller 1030 controls driver 1026 and 1028 so that they drive as described above pixel 1024.

Figure 11 illustrates the example of the display system of the drive circuit for Fig. 6 and Fig. 7.The display system 1040 of Figure 11 Including the array of display 1042 with multiple pixels 1044.Pixel 1044 includes the driving electricity of the drive circuit 164A or Fig. 7 of Fig. 6 Road 164B, and can be the image element circuit 160B of the image element circuit 160A or Fig. 7 of Fig. 6.

Array of display 1042 is active matrix light-emitting display.In one example, array of display 1042 is that AMOLED shows Show array.Array of display 1042 can be monochromatic, polychrome or total colouring, and can include one or more EL elements (for example, organic EL).Array of display 1042 can be used for mobile device, PDA, computer display or mobile phone.

Each selection line SELi and SELi+1 are corresponding with the SEL of Fig. 6 and Fig. 7.Each data wire VDATAj and VDATAj+ 1 is corresponding with the VDATA of Fig. 6 and Fig. 7.Pixel 1044 is arranged in the way of ranks.Colleague's pixel in array of display 1042 Shared selection line (SELi, SELi+1).Same column pixel shared data line (VDATAj, VDATAj+ in array of display 1042 1)。

In fig. 11 it is shown that four pixels 1044.However, the quantity of pixel 1044 can be according to system design not Together, however it is not limited to four.In fig. 11 it is shown that two selection lines and two data lines.However, the number of selection line and data wire Amount can be different according to system design, however it is not limited to two.

Gate drivers 1046 drive SELi and SELi ± 1.Gate drivers 1046 could be for carrying address signal The address driver of supply address wire (for example, selection line).Data driver 1048 produce programming data and drive VDATAj and VDATAj+1.Controller 1040 controls driver 1046 and 1048 so that they drive as described above pixel 1044.

Figure 12 illustrates the simulation result of the image element circuit 100 of Fig. 1.In fig. 12, " g1 " is represented for driving transistor The different drifts of 106 threshold voltage and initial current for 500nA situation, the electric current of the image element circuit 100 shown in Fig. 1； When " g2 " represents that the difference of the threshold voltage for driving transistor 106 is drifted about and initial current is 150nA, image element circuit 100 electric current.In fig. 12, " g3 " represents that the difference of the threshold voltage for driving transistor is drifted about and initial current is The situation of 500nA, the electric current of traditional 2-TFT image element circuits；" g4 " represents the difference of the threshold voltage for driving transistor Drift and initial current for 150nA situation, the electric current of traditional 2-TFT image element circuits.For clearly for new drive scheme, Mean pixel current stabilization, and if removing discharge transistor (for example, 106) (traditional 2-TFT of Fig. 1 from image element circuit Image element circuit), then mean pixel electric current is remarkably decreased.

Figure 13 illustrates the example of the image element circuit for applying the pixel drive scheme according to another embodiment of the invention. The image element circuit 210 of Figure 13 includes OLED 212 and the drive circuit 214 for driving OLED 212.Drive circuit 214 includes Driving transistor 216, discharge transistor 218, first switch transistor 220 and second switch transistor 222 and storage capacitance Device 224.

Image element circuit 210 is similar with the image element circuit 190 of Fig. 8.The drive circuit 164 of drive circuit 214 and Fig. 5 and Fig. 8 It is similar.Transistor 216,218 and 220 is corresponding with transistor 166,168 and 170 of Fig. 5 and Fig. 8 respectively.Transistor 216,218 Can be same or like with transistor 166,168 and 170 of Fig. 5 and Fig. 8 with 220.Transistor 222 can be with the transistor of Fig. 5 172 or Fig. 8 transistor 178 is same or like.In one example, transistor 216,218,220 and 222 includes gate terminal Son, source terminal and drain terminal.Storage 224 is corresponding with the storage 174 of Fig. 5 to Fig. 8.Storage 224 can be same or like with the storage 174 of Fig. 5 to Fig. 8.OLED 212 is corresponding with the OLED 192 of Fig. 8.OLED 212 can be same or like with the OLED 192 of Fig. 8.

Transistor 216,218,220 and 222 can use non-crystalline silicon, nanometer/microcrystal silicon, polysilicon, organic semiconductor skill Art (for example, organic tft), NMOS/PMOS technologies or CMOS technology (for example, MOSFET) are manufacturing.

In image element circuit 210, driving transistor 216 is arranged on electrode (for example a, anode of VDD and OLED 212 Electrode) between.Switching transistor 222 and discharge transistor 218 are connected in series in the gate terminal and OLED of driving transistor 216 Between 212.One terminal of switching transistor 222 is connected to the gate terminal of driving transistor at node A3.Electric discharge crystal The gate terminal of pipe 218 is connected to node A3.Storage 224 is arranged between node A3 and OLED 212.Switch crystal Pipe 220 is arranged between VDATA and node A3.The gate terminal of switching transistor 220 is connected to selection line SEL [n].Switch is brilliant The gate terminal of body pipe 222 is connected to selection line SEL [n+1].Another electrode (for example, cathode electrode) connection of OLED 212 To power line (for example, sharing ground connection) 226.In one example, SEL [n] is the line n address wire in array of display, and SEL [n+1] is (n+1) row address line in array of display.

As described below, image element circuit 210 is provided permanent in frame time by adjusting the grid voltage of driving transistor 216 Fixed average current.

Figure 14 illustrates another example of the image element circuit of the drive circuit 214 with Figure 13.The image element circuit of Figure 14 240 is similar with the image element circuit 160 of Fig. 5.Image element circuit 240 includes OLED 242.OLED 242 can be with the OLED 162 of Fig. 5 It is same or like.In image element circuit 240, driving transistor 216 is arranged on an electrode (for example, the negative electrode electricity of OLED 242 Pole) between power line (for example, sharing ground connection) 246.One terminal of discharge transistor 218 and the one of storage 224 Individual terminal is connected to power line 246.Another electrode (for example, anode electrode) of OLED 242 is connected to VDD.Switching transistor 220 gate terminal is connected to selection line SEL [n].The gate terminal of switching transistor 222 is connected to selection line SEL [n+1].

With the similar mode of image element circuit 210 with Figure 13, image element circuit 240 provides constant average electricity in frame time Stream.

Figure 15 illustrates the example of the driving method of image element circuit according to embodiments of the present invention.The waveform of Figure 15 is applied in In the drive circuit 214 with Figure 13 and Figure 14 image element circuit (for example, 210, Figure 14 of Figure 13 240).

The operation cycle of Figure 15 includes three operation cycles 250,252 and 254.Operation cycle 250 forms programming cycle, behaviour Make the formation compensation cycle of cycle 252 and the operation cycle 254 forms drive cycle.With reference to Figure 13 to Figure 15, in programming cycle 250 Interior, when SEL [n] is high level, node A3 is charged to program voltage by switching transistor 220.In the second operation cycle In 252, SEL [n+1] enters high voltage.SEL [n] is disabling (or invalid).Node A3 quilts by discharge transistor 218 Electric discharge.Within the 3rd operation cycle 254, SEL [n] and SEL [n+1] is disabling.Because driving transistor 216 and electric discharge crystal Pipe 218 has identical bias condition, so they experience identical threshold voltage shift.It is that electric discharge is brilliant in view of discharge time The function of the mutual conductance of body pipe 218, when the threshold voltage of the discharge transistor 218 of driving transistor 216/ increases, under discharge voltage Drop.Therefore, the grid voltage of driving transistor 216 is accordingly adjusted.

Additionally, in the pixel 240 of Figure 14, the increase of the OLED voltage of OLED 242 causes higher grid voltage.Cause This, pixel current keeps constant.

Figure 16 illustrates the example of the display system of the drive circuit for Figure 13 and Figure 14.The display system 1060 of Figure 16 Including the array of display 1062 with multiple pixels 1064.The drive circuit 214 of pixel 1064 including Figure 13 and Figure 14, and can be with It is the image element circuit 210 of Figure 13 or the image element circuit 240 of Figure 14.

Array of display 1062 is active array active display.In one example, array of display 1062 is that AMOLED shows Show array.Array of display 1062 can be monochromatic, polychrome or full-color display, and can include one or more EL elements (for example, organic EL).Array of display 1062 can be used for mobile device, PDA, computer display or mobile phone.

SEL [k] (k=n+1, n+2) is the address wire for row k.VDATAl (l=j, j+1) be data wire and with figure 13 is corresponding with the VDATA of Figure 14.Pixel 1064 is arranged in the way of ranks.In array of display 1062, colleague's pixel is shared Selection line SEL [k].In array of display 1062, same column pixel shared data line VDATAl.

In fig. 16 it is shown that four pixels 1064.However, the quantity of pixel 1064 can be according to system design not Together, however it is not limited to four.In fig. 16 it is shown that three address wires and two data lines.However, the number of address wire and data wire Amount can be different according to system design.

Gate drivers 1066 drive SEL [k].Gate drivers 1066 could be for for address signal being supplied to address The address driver of line (for example, selection line).Data driver 1068 produces programming data and drives VDATAl.Controller 1070 Control driver 1066 and 1068 is so that they drive as described above pixel 1064.

Figure 17 illustrates the simulation result of the image element circuit 160 of Fig. 5.In fig. 17, " g5 " is represented for driving transistor The different drifts of 166 threshold voltage and initial current for 630nA situation, the electric current of the image element circuit 160 shown in Fig. 5； When " g6 " represents that the difference of the threshold voltage for driving transistor 166 is drifted about and initial current is 430nA, image element circuit 160 electric current.Even if as can be seen that after the threshold voltage shift 2V of driving transistor, pixel current is still highly stable.Cause It is that the image element circuit 210 of Figure 13 and the image element circuit 160 of Fig. 5 are similar, so to those skilled in the art, image element circuit 210 pixel current obviously also will be stable.

Figure 18 illustrates the simulation result of the image element circuit 160 of Fig. 5.In figure 18, " g7 " is represented for driving transistor 166 different OLED voltages and initial current for 515nA situation, the electric current of the image element circuit 160 shown in Fig. 5；" g8 " table Show for driving transistor 166 different OLED voltages and initial current be 380nA in the case of, the electric current of image element circuit 160.Can To find out, even if after OLED voltage drift 2V, pixel current is still highly stable.Because the image element circuit 210 of Figure 13 and Fig. 5 Image element circuit 160 be similar to, so to those skilled in the art, the pixel current of image element circuit 210 obviously also will be steady Fixed.

Figure 19 shows the drive cycle and programming cycle for being driven to the array of display 1062 of Figure 16.In figure In 16, (j=1,2,3,4) represent the jth row of array of display 1062 to row j.In Figure 19, " P " represents programming cycle；" C " is represented Compensation cycle；And " D " represents drive cycle.Programming cycle P of jth row is Chong Die with the drive cycle D of (j+1) row.Jth row Compensation cycle C is Chong Die with programming cycle P of (j+1) row.The compensation cycle C weights of the drive cycle D of jth row and (j+1) row It is folded.

Figure 20 illustrates the example of the image element circuit for applying the pixel drive scheme according to another embodiment of the invention. The image element circuit 300 of Figure 20 includes OLED 302 and the drive circuit 304 for driving OLED 302.Drive circuit 304 includes Driving transistor 306, switching transistor 308, discharge transistor 310 and storage 312.OLED 302 for example includes sun Luminescent layer between pole, negative electrode and anode and negative electrode.

In one example, transistor 306,308 and 310 is n-type transistor.In another example, transistor 306, 308 and 310 is p-type transistor, or the combination of n-type transistor and p-type transistor.In one example, transistor 306,308 and 310 include gate terminal, source terminal and drain terminal.Transistor 306,308 and 310 can use non-crystalline silicon, nanometer/micro- Crystal silicon, polysilicon, organic semiconductor technologies (for example, organic tft), NMOS/PMOS technologies or CMOS technology (for example, MOSFET) To manufacture.

Driving transistor 306 is arranged between voltage supply line Vdd and OLED 302.One end of driving transistor 306 Sub (for example, source electrode) is connected to Vdd.Another terminal (for example, draining) of driving transistor 306 is connected to the one of OLED 302 Individual electrode (for example, anode electrode).(for example, altogether another electrode (for example, cathode electrode) of OLED 302 is connected to power line With ground connection) 314.One terminal of storage 312 is connected to the gate terminal of driving transistor 306 at node A4.Deposit Another terminal of storing up electricity container 312 is connected to Vdd.The gate terminal of switching transistor 308 is connected to selection line SEL [i].Open A terminal for closing transistor 308 is connected to data wire VDATA.Another terminal of switching transistor 308 is connected to node A4. The gate terminal of discharge transistor 310 is connected to selection line SEL [i-1] or SEL [i+1].In one example, selection line SEL [m] (m=i-1, i, i+1) be for array of display in m rows address wire.One terminal connection of discharge transistor 310 To node A4.Another terminal of discharge transistor 310 is connected to sensor 316.In one example, each pixel includes Sensor 316.In another example, sensor 316 is shared by multiple image element circuits.

Sensor 316 includes sense terminal and bias terminal Vb1.The sense terminal of sensor 316 is connected to electric discharge crystal Pipe 310.Bias terminal Vb1 can for example be connected to a terminal (example of (but not limited to) ground, Vdd or driving transistor 306 Such as, source electrode).Sensor 316 detects the energy transmission from image element circuit.Sensor 316 have changed according to sensing result Conductance.Sensor 316 absorbs light or the heat energy that pixel sends, so the carrier density change of sensor.Sensor 316 For example provide feedback by (but not limited to) optics, calorifics or other conversion regimes.Sensor 316 can (but not limited In) optical pickocff or thermal sensor.It is as described below, node A4 is discharged according to the conductance of sensor 316.

Drive circuit 304 is used for implementing the programming of image element circuit, compensation/correction and drives.Image element circuit 300 is by adjusting The grid voltage of driving transistor 306 is providing the constant luminance in its display life.

Figure 21 illustrates another example of the image element circuit of the drive circuit 304 with Figure 20.The image element circuit of Figure 21 330 is similar with the image element circuit 300 of Figure 20.Image element circuit 330 includes OLED 332.OLED 332 can be with the OLED of Figure 20 302 is same or like.In image element circuit 330, a terminal (for example, draining) of driving transistor 306 is connected to OLED 332 electrode (for example, cathode electrode), and another terminal (for example, source electrode) of driving transistor 306 is connected to power supply Line (for example, sharing ground connection) 314.Additionally, a terminal of storage 312 is connected to node A4, and storage 312 Another terminal be connected to power line 314.With the similar mode of image element circuit 300 with Figure 20, image element circuit 330 is provided Constant luminance in its display life.

With reference to Figure 20 and Figure 21, the driving transistor 306 and OLED 302/332 in image element circuit it is aging with two kinds not Same mode is compensated：Correct in compensation and panel in pixel.

Will be explained in compensation in pixel.Figure 22 illustrates the driving of the image element circuit according to another embodiment of the invention The example of method.Implement pixel by the way that the waveform of Figure 22 to be put on the pixel of the drive circuit 304 with Figure 20 and Figure 21 Interior compensation.

The operation cycle of Figure 22 includes three operation cycles 340,342 and 344.Operation cycle 340 is the programming week of the i-th row Phase and be (i+1) row drive cycle.Operation cycle 342 is the compensation cycle of the i-th row and is (i+1) capable programming Cycle.Operation cycle 344 is the drive cycle of the i-th row and is (i+1) capable compensation cycle.Reference Figure 20 to Figure 22, In the programming cycle 340 of the i-th row of display, when selection line SEL [i] is high level, the section of the i-th row in image element circuit Point A4 is charged to program voltage by switching transistor 308.In the programming cycle 342 of (i+1) row, SEL [i+1] becomes For high level, and it is stored in the voltage at node A4 and is changed according to the conductance of sensor 316.In the drive cycle 344 of the i-th row It is interior, the current control OLED brightness of driving transistor 306.

The amount of the discharge voltage at node A4 depends on the conductance of sensor 316.Sensor 316 be subject to OLED brightness or The control of temperature.Therefore, when pixel ageing, the amount of discharge voltage is reduced.This is caused has in the service life of image element circuit There is constant luminance.

Figure 23 illustrates the example of the display system of the drive circuit 304 for Figure 20 and Figure 21.The display system of Figure 23 1080 include the array of display 1082 with multiple pixels 1084.Pixel 1084 includes the drive circuit 304 of Figure 20 and Figure 21, and Can be the image element circuit 300 of Figure 20 or the image element circuit 330 of Figure 21.

Array of display 1082 is active matrix light-emitting display.In one example, array of display 1082 is that AMOLED shows Show array.Array of display 1082 can be monochromatic, polychrome or full-color display, and can include one or more electroluminescent Light (EL) element (for example, organic EL).Array of display 1082 can be used for mobile device, personal digital assistant (PDA) (PDA), computer Display or mobile phone.

SEL [i] (i=m-1, m, m+1) in Figure 23 is for the address wire of the i-th row.VDATAn (n=j, j in Figure 23 + 1) it is for the data wire of the n-th row.Address wire SEL [i] is corresponding with selection line SEL [i] of Figure 20 and Figure 21.Data wire VDATAn is corresponding with the VDATA of Figure 20 and Figure 21.

Gate drivers 1086 are included for the address that address signal is supplied to each bar address wire to drive address wire to be driven Dynamic device.Data driver 1088 produces programming data and driving data line.Controller 1090 control driver 1086 and 1088 with Make them drive pixel 1084 as described above and implement compensation in pixel.

In fig 23, four pixels 1084 are shown.However, the quantity of pixel 1084 can be according to system design not Together, however it is not limited to four.In fig 23, three address wires and two data lines are shown.However, the number of selection line and data wire Amount can be different according to system design.

In fig 23, pixel 1084 is including the sensor 316 of Figure 20 and Figure 21.In another example, such as Figure 24 institutes Show, array of display 1080 there can be the reference pixel of sensor 316 including one or more.

Figure 24 illustrates another example of the display system of the drive circuit 304 for Figure 20 and Figure 21.Figure 24's is aobvious Show that system 1100 includes the array of display 1102 with multiple pixels 1104 He one or more reference pixels 1106.With reference to Pixel 1106 includes the drive circuit 304 of Figure 20 and Figure 21, and can be the image element circuit 300 of Figure 20 or the image element circuit of Figure 21 330.In fig. 24, two reference pixels 1106 are shown.However, the quantity of pixel 1106 can be according to system design not Together, however it is not limited to two.Pixel 1104 includes OLED and for driving the driving transistor of OLED, and does not contain Figure 20 and Figure 21 Sensor 316.SEL_REF is the selection line for carrying out selection to the discharge transistor in the array of reference pixel 1106.

Gate drivers 1108 drive selection line SEL_REF and address wire.Gate drivers 1108 can be with the grid of Figure 23 Driver 1086 is same or like.The driving data line of data driver 1110.Data driver 1110 can be with the number of Figure 23 It is same or like according to driver 1088.Controller 1112 controls driver 1108 and 1110.

Can (1106) 1084, Figure 24's of Figure 23 be operable under offer is used for the reference pixel of Figure 23 and Figure 24 State the ageing information of algorithm in panel：It is as described below controller (1090, Figure 24 of Figure 23 1112) or drive-side (Figure 23 1088, Figure 24 1110) correct program voltage.

Will be explained in correction in panel.With reference to Figure 21, extracting picture by way of reading back to sensor 316 Plain circuit it is aging, and program voltage is corrected implement in panel correct.Rectification building-out includes threshold value Vt in panel Drift and OLED are deteriorated in interior pixel ageing.

Figure 25 illustrates the example of pixel system according to embodiments of the present invention.The pixel system of Figure 25 includes the circuit that reads back 360.The circuit 360 that reads back includes charge-pump amplifier 362 and capacitor 364.One terminal of charge-pump amplifier 362 is via opening Closing SW1 can be connected with data wire VDATA.Another terminal of charge-pump amplifier 362 is connected to bias voltage Vb2.Electric charge The voltage that pump amplifier 362 reads back from node A4 releasings via switch SW1.

The output 366 of charge-pump amplifier 362 changes according to the voltage at node A4.Via charge-pump amplifier 362 Can be from the time-dependent characteristic of node A4 read pixel circuits.

In fig. 25, one read back circuit 360 and one switch SW1 be illustrated for an image element circuit.However, reading Telegram in reply road 360 and switch SW1 can be arranged for one group of image element circuit (for example, the image element circuit in row).In fig. 25, read Telegram in reply road 360 and switch SW1 are arranged at image element circuit 300.In another example, read back circuit 360 and switch SW1 are applied to The image element circuit 330 of Figure 21.

Figure 26 illustrates the example of the display system of the circuit 360 that reads back with Figure 25.The display system 1120 of Figure 26 is wrapped Include the array of display 1122 with multiple pixels 1124.Pixel 1124 includes the drive circuit 304 of Figure 20 and Figure 21, and can be The image element circuit 300 of Figure 20 or the image element circuit 330 of Figure 21.Pixel 1124 can be identical with the 1106 of the 1084 of Figure 23 or Figure 24 Or it is similar.

In fig. 26, four pixels 1124 are shown.However, the quantity of pixel 1124 can be according to system design not Together, however it is not limited to four.In fig. 26, three address wires and two data lines are shown.However, the number of selection line and data wire Amount can be different according to system design.

For every string, read back circuit RB1 [n] (n=j, j+1) and switch SW1 [n] (not shown) are provided with.Read back electricity Road RB1 [n] can include switch SW1 [n].Read back circuit RB1 [n] and switch SW1 [n] respectively with the circuit 360 that reads back of Figure 25 It is corresponding with switch SW1.In the following description, term RB1 and RB1 [n] can be interchangeably used, and RB1 may refer to The circuit 360 that reads back of certain a line in Figure 25.

Array of display 1122 is active matrix light-emitting display.In one example, array of display 1122 is that AMOLED shows Show array.Array of display 1122 can be monochromatic, polychrome or full-color display, and can include one or more electroluminescent Light (EL) element (for example, organic EL).Array of display 1122 can be used for mobile device, personal digital assistant (PDA), computer Display or mobile phone.

Gate drivers 1126 include the address driver for driving address wire.Gate drivers 1126 can be with Figure 23 Gate drivers 1086 or Figure 24 gate drivers 1108 it is same or like.Data driver 1128 produce programming data and Driving data line.Data driver 1128 includes exporting come the electricity of calculation and programming data according to the circuit RB1 [n] that reads back accordingly Road.Controller 1130 controls driver 1126 and 1128, so as to drive pixel 1124 as described above.The control of controller 1130 is opened Close SW1 [n] to be switched on or switched off so that RB1 [n] is connected to corresponding data wire VDATAn.

Pixel 1124 is operable to provide the ageing information for algorithm in panel, wherein, according to the circuit RB1 that reads back Output voltage, controller 1130 or the side of driver 1128 correction program voltage.Simple correction can be following scalings (scaling)：Wherein, program voltage is amplified by the change of the output voltage of the circuit RB1 that reads back.

In fig. 26, pixel 1124 is including the sensor 316 of Figure 20 and Figure 21.In another example, array of display 1120 can have the reference pixel of sensor 316 including one or more, as shown in figure 27.

Figure 27 illustrates another example of the display system of the circuit that reads back with Figure 25.The display system 1140 of Figure 27 Including the array of display 1142 with multiple pixels 1144 He one or more reference pixels 1146.Reference pixel 1146 is wrapped The drive circuit 304 of Figure 20 and Figure 21 is included, and can be the image element circuit 300 of Figure 20 or the image element circuit 330 of Figure 21.In Figure 27 In, show two reference pixels 1146.However, the quantity of pixel 1146 can be different according to system design, however it is not limited to Two.Pixel 1144 includes OLED and the driving transistor for driving OLED, and not comprising the sensor of Figure 20 and Figure 21 316.SEL_REF is the selection line for carrying out selection to the discharge transistor in the array of reference pixel 1146.

Gate drivers 1148 drive address wire and selection line SEL_REF.Gate drivers 1148 can be with the grid of Figure 26 Driver 1126 is same or like.Data driver 1150 produces programming data, corrects programming data and driving data line.Number Can be same or like with the data driver 1128 of Figure 26 according to driver 1150.Controller 1152 controls the He of driver 1148 1150。

Reference pixel 1146 is operated to provide ageing information for algorithm in panel, wherein, according to reading back circuit RB1's Output voltage, in controller 1152 or the side of driver 1150 correction program voltage.Simple correction can be such scaling：It is logical The change of output voltage of the circuit RB1 that reads back is crossed amplifying program voltage.

Figure 28 illustrates the example of the driving method of the image element circuit according to another embodiment of the invention.The display of Figure 26 The display system 1140 of system 1120 and Figure 27 can be operated according to the waveform of Figure 28.By the way that the waveform of Figure 28 is put on into tool Read back circuit (for example, the RB1 of 360, Figure 26 and Figure 27 of Figure 25) display system implementing correction in panel.

The operation cycle of Figure 28 includes the operation cycle 380,382,383,384 and 386.Operation cycle 380 is the volume of the i-th row The journey cycle.Operation cycle 382 is the drive cycle of the i-th row.The drive cycle of each row is independently of other rows.Operation cycle 383 It is the initialization cycle of the i-th row.Operation cycle 384 is the integration period of the i-th row.Operation cycle 386 is reading back week for the i-th row Phase.

With reference to Figure 25 to Figure 28, in the programming cycle 380 of the i-th row, when selection line SEL [i] is high level, pixel electricity Node A4 in i-th row on road is charged to program voltage by switching transistor 308.In the programming cycle 380 of the i-th row, Node A4 is charged to the program voltage after correction.In the drive cycle 382 of the i-th row, OLED is controlled by driving transistor 306 Brightness.In the initialization cycle 383 of the i-th row, node A4 is charged to bias voltage.In the integration period 384 of the i-th row, SEL [i-1] is high level, therefore the voltage at node A4 is discharged by sensor 316.It is right within the cycle of reading back 386 The change of the voltage at node A4 read back so that for correcting (for example, program voltage is zoomed in and out).

In the beginning in the cycle of reading back 386, what the switch SW1 of the circuit RB1 that reads back was to turn on, and data wire VDATA is electrically charged To Vb2.Further, since from the leakage of all pixels for being connected to data wire VDATA, capacitor 364 is charged to voltage Vpre.Then, selection line SEL [i] is changed into high level, so discharge voltage Vdisch is formed in the two ends of capacitor 364.Two carry Difference between power taking pressure (Vpre and Vdisch) is used to calculate pixel ageing.

Sensor 316 can not work and the work only in integration period 384 in the most of the time.Therefore, sensor 316 It is aging very slight.Additionally, sensor 316 can be power supply levels to keep the transistors properly biased to significantly inhibit its deterioration.

Additionally, the method can be used in extracting the aging of sensor 316.Figure 29 is illustrated and is extracted the aging of sensor 316 Method example.The voltage that extracts of the sensor of dark pixel and dark reference pixel can be for the aging of discovery sensor 316. For example, the display system 1140 of Figure 27 can be operated according to the waveform of Figure 29.

The operation cycle of Figure 29 includes the operation cycle 380,382,383,384 and 386.Operation cycle 380 is the volume of the i-th row The journey cycle.Operation cycle 382 is the drive cycle of the i-th row.Operation cycle 383 is the initialization cycle of the i-th row.Operation cycle 384 is the integration period of the i-th row.Operation cycle 386 is reading back the cycle for the i-th row.Operation cycle 380 (second appearance) is ginseng Examine capable initialization cycle.Operation cycle 384 (second appearance) is the integration period of reference line.(second of operation cycle 386 Occur) it is reading back the cycle (extraction) for reference line.

Reference line include one or more reference pixels (for example, Figure 27 1146), and positioned at (m-1) OK.SEL_ REF is for discharge transistor (for example, the selection line for 310) carrying out selection of Figure 25 in the reference pixel to reference line.

With reference to Figure 25, Figure 27 and Figure 29, in order to extract the aging of sensor 316, normal pixel circuit is (for example, 1144) not Work.To voltages and reference pixel (for example, the carrying in a quiescent state 1146) extracted from normal pixel via output 316 Difference between the voltage for taking is extracted.In the case where reference pixel does not receive stress (stress), reference pixel is extracted Off position voltage.The difference causes the deterioration for being extracted sensor 316.

Figure 30 illustrates the example of pixel system in accordance with another embodiment of the present invention.The pixel system of Figure 30 includes reading Telegram in reply road 400.The circuit 400 that reads back includes trans-impedance amplifier 402.One terminal of trans-impedance amplifier 402 can be via switch SW2 It is connected to data wire VDATA.The voltage that trans-impedance amplifier 402 reads back from node A4 releasings via switch SW2.Switch SW2 can be with It is same or like with the switch SW1 of Figure 25.

The output of trans-impedance amplifier 402 changes according to the voltage at node A4.Can be from section via trans-impedance amplifier 402 The time-dependent characteristic of point A4 read pixel circuits.

In fig. 30, one read back circuit 400 and one switch SW2 be illustrated for an image element circuit.However, reading back Circuit 400 and switch SW2 can be arranged for one group of image element circuit (for example, each image element circuit in row).In fig. 30, read Telegram in reply road 400 and switch SW2 are arranged at image element circuit 300.In another example, read back circuit 400 and switch SW2 applications In the image element circuit 330 of Figure 21.

Figure 31 illustrates the example of the display system of the circuit 400 that reads back with Figure 30.The display system 1160 of Figure 31 is wrapped Include the array of display 1162 with multiple pixels 1164.Pixel 1164 includes the drive circuit 304 of Figure 20 and Figure 21, and can be The image element circuit 300 of Figure 20 or the image element circuit 330 of Figure 21.Pixel 1164 can be with the pixel 1124 of Figure 26 or the pixel of Figure 27 1146 is same or like.

In Figure 31, four pixels 1164 are shown.However, the quantity of pixel 1164 can become according to system design Change, however it is not limited to four.In Figure 31, three address wires and two data lines are shown.However, the number of selection line and data wire Amount can change according to system design.

For every string, read back circuit RB2 [n] (n=j, j+1) and switch SW2 [n] (not shown) are provided with.Read back electricity Road RB2 [n] can include SW2 [n].Read back circuit RB2 [n] and switch SW2 [n] circuit 400 and is opened respectively with reading back for Figure 30 Close SW2 corresponding.In the following description, term RB2 and RB2 [n] can be interchangeably used, and RB2 may refer to Figure 30 Certain a line the circuit 400 that reads back.

Array of display 1162 is active matrix light-emitting display.In one example, array of display 1162 is that AMOLED shows Show array.Array of display 1162 can be monochromatic, polychrome or full-color display, and can include one or more electroluminescent Light (EL) element (for example, organic EL).Array of display 1162 can be used for mobile device, personal digital assistant (PDA) (PDA), computer Display or mobile phone.

Gate drivers 1166 include the address driver for driving address wire.Gate drivers 1166 can be with Figure 26 Gate drivers 1126 or Figure 27 gate drivers 1148 it is same or like.Data driver 1168 produce programming data and Driving data line.Data driver 1168 includes exporting come the electricity of calculation and programming data according to the circuit RB2 [n] that reads back accordingly Road.Controller 1170 controls driver 1166 and 1168, so as to drive pixel 1164 as described above.The control of controller 1170 is opened Close SW2 [n] to be switched on or switched off so that RB2 [n] is connected to corresponding data wire VDATAn.

Pixel 1164 is operated to provide ageing information for algorithm in panel, wherein, according to the output of the circuit RB2 that reads back Voltage is in controller 1170 or the side of driver 1168 correction program voltage.Simple correction can be such scaling：By reading The change of the output voltage of telegram in reply road RB2 is amplifying program voltage.

In Figure 31, pixel 1164 is including the sensor 316 of Figure 20 and Figure 21.In another example, such as Figure 32 institutes Show, array of display 1160 there can be the reference pixel of sensor 316 including one or more.

Figure 32 illustrates another example of the display system of the circuit 400 that reads back with Figure 30.The display system of Figure 32 1200 include the array of display 1202 with multiple pixels 1204 He one or more reference pixels 1206.Reference pixel 1206 drive circuits 304 for including Figure 20 and Figure 21, and can be the image element circuit 300 of Figure 20 or the image element circuit 330 of Figure 21. In Figure 32, two reference pixels 1206 are shown.However, the quantity of pixel 1206 can change according to system design, and It is not limited to two.Pixel 1204 includes OLED and the driving transistor for driving OLED, and not comprising the biography of Figure 20 and Figure 21 Sensor 316.SEL_REF is the selection line that the discharge transistor in the array to reference pixel 1206 carries out selection.

Gate drivers 1208 drive selection line SEL_REF and address wire.Gate drivers 1208 can be with the grid of Figure 27 The gate drivers 1166 of driver 1148 or Figure 31 are same or like.Data driver 1210 produces programming data, correction Programming data and driving data line.Data driver 1210 can be with the data driver 1150 of Figure 27 or the data-driven of Figure 31 Device 1168 is same or like.Controller 1212 controls driver 1208 and 1210.

Reference pixel 1206 is operated so as to provide ageing information for algorithm in following panels：Wherein, according to the electricity that reads back The output voltage of road RB2 is in controller 1212 or the side of driver 1210 correction program voltage.Simple correction can be such Scaling：Program voltage is amplified by the change of the output voltage of the circuit RB2 that reads back.

Figure 33 illustrates the example of the driving method of the image element circuit according to another embodiment of the invention.The display of Figure 31 The display system 1200 of system 1160 and Figure 32 can be operated according to the waveform of Figure 33.By the way that the waveform of Figure 33 is put on into tool Read back circuit (for example, the RB2 of 400, Figure 31 and Figure 32 of Figure 30) display system implementing correction in panel.

The operation cycle of Figure 33 includes the operation cycle 420,422 and 424 for row.Operation cycle 420 is the volume of the i-th row The journey cycle.Operation cycle 422 is the drive cycle of the i-th row.Operation cycle 424 is reading back (extraction) cycle for the i-th row.

With reference to Figure 30 to Figure 33, in the programming cycle 420 of the i-th row, when selection line SEL [i] is high level, pixel electricity Node A4 in i-th row on road is charged to program voltage by switching transistor 308.In the drive cycle 422 of the i-th row, By the current control pixel intensity of driving transistor 306.In the extracting cycle 424 of the i-th row, SEL [i] and SEL [i-1] is height The electric current of level and monitoring sensor 316.The circuit RB2 that reads back amplifies the change of the electric current.The change be used to measure pixel Deterioration in brightness and carry out the deterioration in brightness of compensation pixel by correcting program voltage (for example, zooming in and out to program voltage).

In the beginning in the cycle of reading back 424, when SEL [i] is low level, algorithms selection is used for the switch SW2 of the row of correction It is to turn on.Therefore, leakage current is extracted as the output voltage of trans-impedance amplifier 402.Can be according to stress history (stress history), random or sequential method etc. enter the above-mentioned selection of every trade.Then, SEL [i] is changed into high level, then with The relevant sensor current of the brightness of pixel or temperature is read back the output voltage as trans-impedance amplifier 402.Using leakage electricity Two extraction voltages of stream and sensor current, it becomes possible to calculate pixel ageing.

Sensor 316 can not work and the work only in integration period 424 in the most of the time.Therefore, sensor 316 It is aging very slight.Additionally, sensor 316 can be power supply levels to keep the transistors properly biased to significantly inhibit its deterioration.

Additionally, the method can be used in extracting the aging of sensor 316.Figure 34 illustrates the sensor 316 for extracting Figure 30 Aging method example.For example, the display system 1200 of Figure 32 can be operated according to the waveform of Figure 34.

The operation cycle of Figure 34 includes the operation cycle 420,422 and 424.Operation cycle 420 (occurring for the first time) is the i-th row Programming cycle.Operation cycle 422 is the drive cycle of the i-th row.Operation cycle 424 (occurring for the first time) is reading back for the i-th row (extraction) cycle.Operation cycle 424 (second appearance) is reading back (extraction) cycle for reference line.

Reference line include one or more reference pixels (for example, Figure 32 1206), and positioned at (m-1) OK.SEL_REF It is for discharge transistor (for example, the selection line for 310) carrying out selection of Figure 30 in the reference pixel to reference line.

With reference to Figure 30, Figure 32 and Figure 34, in order to extract the aging of sensor 316, normal pixel circuit is (for example, 1204) not Work.To the output via trans-impedance amplifier 402 from the voltage of normal pixel circuit extraction and reference pixel (for example, 1206) Difference between the voltage for extracting in a quiescent state is extracted.In the case where reference pixel does not receive stress, ginseng is extracted Examine the off position voltage of pixel.Its result is to be extracted the deterioration of sensor 316.

Figure 35 illustrates the example of the image element circuit for applying the pixel drive scheme according to another embodiment of the invention. The image element circuit 500 of Figure 35 includes OLED 502 and the drive circuit 504 for driving OLED 502.Drive circuit 504 includes Driving transistor 506, switching transistor 508, discharge transistor 510, regulation circuit 516 and storage 512.

OLED 502 can be same or like with the OLED 302 of the OLED 212 of Figure 13 or Figure 20.Capacitor 512 can be with It is same or like with the capacitor 312 of the capacitor 224 of Figure 13 or Figure 20.Transistor 506,508 and 510 can be with the crystalline substance of Figure 13 Transistor 306,308 and 310 of body pipe 206,220 and 222 or Figure 20 are same or like.In one example, transistor 506, 508 and 510 include gate terminal, source terminal and drain terminal.

Driving transistor 506 is arranged between voltage supply line VDD and OLED 502.One end of driving transistor 506 Son (for example, draining) is connected to VDD.Another terminal (for example, source electrode) of driving transistor 506 is connected to the one of OLED 502 Individual electrode (for example, anode electrode).Another electrode (for example, cathode electrode) of OLED 502 is connected to power line VSS (examples Such as, ground connection is shared) 514.One terminal of storage 512 is connected to the gate terminal of driving transistor 506 at node A5 Son.Another terminal of storage 512 is connected to OLED 502.The gate terminal of switching transistor 508 is connected to selection Line SEL [n].One terminal of switching transistor 508 is connected to data wire VDATA.Another terminal of switching transistor 508 connects It is connected to node A5.The gate terminal of transistor 510 is connected to control line CNT [n].In one example, n is represented in array of display Line n.One terminal of transistor 510 is connected to node A5.Another terminal of transistor 510 is connected to regulation circuit 516 terminal.Another terminal for adjusting circuit 516 is connected to OLED 502.

Because the resistance for adjusting circuit 516 changes according to pixel ageing, adjust circuit 516 and be provided for and put Electric transistor 510 adjusts together the voltage of A5.In one example, the transistor 218 that circuit 516 is Figure 13 is adjusted.Another In individual example, the sensor 316 that circuit 516 is Figure 20 is adjusted.

In order to improve the drift of the threshold voltage of driving transistor 506, image element circuit is disconnected in a part of frame time.

Figure 36 illustrates the example of the driving method of the image element circuit according to another embodiment of the invention.The waveform of Figure 36 Put on the image element circuit of Figure 35.The operation cycle of image element circuit 500 includes programming cycle 520, discharge cycle 522, luminous week Phase 524, reset cycle 526 and relaxaton period 527.

In programming cycle 520, node A5 is charged to program voltage VP.In discharge cycle 522, CNT [n] is changed into high Voltage at level, and node A5 is partly released with the aging of compensation pixel.In light period 524, SEL [n] and CNT [n] is changed into low level.In light period 524, the control OLED 502 of driving transistor 506.Within the reset cycle 526, CNT [n] is changed into high level and is completely released the voltage at node A5 within the reset cycle 526 with this.In relaxaton period 527, drive Transistor 506 does not recover by stress and from light period 524.Therefore, the aging of driving transistor 506 is remarkably reduced.

Figure 37 illustrates the example of the display system of the image element circuit containing Figure 35.The display system 1300 of Figure 37 includes Array of display 1302 with multiple pixels 500.Array of display 1302 is active matrix light-emitting display.In one example, Array of display 1302 is AMOLED array of display.Pixel 500 is arranged in row and column fashion.In Figure 37, line n is shown Two pixels 500.Array of display 1302 can include plural pixel.

Array of display 1302 can be monochromatic, polychrome or full-color display, and can include that one or more are electroluminescent Luminous (EL) element (for example, organic EL).Array of display 1302 can be used for mobile device, personal digital assistant (PDA) (PDA), calculate Machine display or mobile phone.

Address wire SEL [n] is arranged at line n.Control line CNT [n] is arranged at line n.Data wire VDATAk (k= J, j+1) it is arranged at kth row.Address wire SEL [n] is corresponding with the SEL of Figure 35 [n].The CNT of control line CNT [n] and Figure 35 [n] is corresponding.Data wire VDATAk (k=j, j+1) is corresponding with the VDATA of Figure 35.

Gate drivers 1306 drive SEL [n].Data driver 1308 produces programming data and drives VDATAk.Control Device 1310 controls driver 1306 and 1308, so as to drive pixel 500 to produce the waveform of Figure 36.

Figure 38 illustrates another example of the display system of the image element circuit 500 for including Figure 35.The display system of Figure 38 System 1400 includes the array of display 1402 with multiple pixels 500.Array of display 1402 is active matrix light-emitting display.One In individual example, array of display 1402 is AMOLED array of display.Pixel 500 is arranged in row and column fashion.In Figure 38, illustrate Four pixels 500 of line n.Array of display 1402 can include more than four pixels.

SEL [i] (i=n, n+1) is selection line and corresponding with the SEL of Figure 35 [n].CNT [i] (i=n, n+1) is control Line and corresponding with the CNT of Figure 35 [n].OUT [k] (k=n-1, n, n+1) is the output of gate drivers 1406.Selection line energy Enough it is connected to the output from gate drivers 1406 or one of VL lines.VDATAm (m=j+1) is data wire and and Figure 35 VDATA it is corresponding.Data driver 1408 controls VDATAm.The control gate driver 1406 of controller 1410 and data-driven Device 1408, so as to operate image element circuit 500.

Control line shares the identical output from gate drivers 1406 with selection line by switch 1412.Putting in Figure 36 In the electric cycle 526, RES signal changes switch 1412 directions and selection line are connected to into the VL lines with low-voltage, so that pixel The transistor 508 of circuit 500 ends.OUT [n-1] is high level, so CNT [n] is high level.Therefore, by adjusting circuit Voltage at 516 and the adjustment node A5 of discharge transistor 510.Within other operation cycles, RES signals and switch 1412 will Selection line is connected to the corresponding output (for example, SEL [n] is connected to OUT [n]) of gate drivers.Switch 1412 can use face Plate manufacturing technology (for example, non-crystalline silicon) and be fabricated on panel or can be integrated in the inside of gate drivers.

Figure 39 illustrates the example of the image element circuit for applying the pixel drive scheme according to another embodiment of the invention. In programming cycle, image element circuit 600 is programmed according to programming information, and in light period, is driven according to programming information Dynamic image element circuit 600 lights.The image element circuit 600 of Figure 39 includes OLED 602 and the drive circuit for driving OLED 602 604.OLED 602 is the luminescent device lighted in light period.OLED 602 has electric capacity 632.OLED 602 for example includes sun Luminescent layer between pole, negative electrode and anode and negative electrode.

Drive circuit 604 includes driving transistor 606, switching transistor 608, switches set 650, the and of storage 612 Adjust transistor 646.In light period, driving transistor 606 transports through the driving current of OLED 602.In programming cycle It is interior, to charge to storage 612 based in part on the voltage of programming information.Switching transistor 608 is according to selection line Voltage is sent to storage 612 operating by SEL in programming cycle.Adjust transistor 646 and will leak out electric current biography The gate terminal of driving transistor 606 is delivered to, so as to adjust the grid voltage of driving transistor 606.

In one example, transistor 606,608 and 646 is n-type transistor.In another example, transistor 606, 608 and 646 is p-type transistor, or the combination of n-type transistor and p-type transistor.In one example, transistor 606,608 and 646 include gate terminal, source terminal and drain terminal.

Transistor 606,608 and 646 can use non-crystalline silicon, nanometer/microcrystal silicon, polysilicon, organic semiconductor technologies (example Such as, organic tft), NMOS/PMOS technologies or CMOS technology (for example, MOSFET) to be manufacturing.

Driving transistor 606 is by switch or is disposed directly between voltage supply line VDD and OLED 602.Drive brilliant One terminal of body pipe 606 is connected to VDD.Another terminal of driving transistor 606 is connected to an electrode of OLED 602 (for example, anode electrode).The gate terminal of switching transistor 608 is connected to selection line SEL.One end of switching transistor 608 Son is connected to data wire VDATA.Another terminal of switching transistor 608 is connected to node A.One of storage 612 Terminal is connected to node A.Another terminal of storage 612 is connected to OLED 602.Another electrode of OLED 602 (for example, cathode electrode) is connected to power line (for example, sharing ground connection) 614.

A terminal for adjusting transistor 646 is connected to the gate terminal of driving transistor 606.Adjust transistor 646 Second terminal is connected to an electrode (for example, anode electrode) of OLED 602.The gate terminal for adjusting transistor 646 is connected to Adjust the Second terminal of transistor 646.Therefore, adjust transistor 646 and be offset to the sub-threshold region that very small current is provided. During higher temperature, the subthreshold current for adjusting transistor 646 is significantly increased, and it reduces the mean gate of driving transistor 606 Voltage.

It is discharge transistor that switches set 650 can include being illustrated above in connection with various embodiments of the invention, extra Any of construction such as switching transistor, resistance, sensor and/or amplifier.For example, as shown in figure 1, switches set 650 Discharge transistor 108 can be included.In light period, discharge transistor 108 discharges the electricity being electrically charged in storage 612 Pressure.In this embodiment, a terminal of discharge transistor 108 and the gate terminal of discharge transistor 108 connect at node A It is connected to the gate terminal of driving transistor 606.Another terminal of discharge transistor 108 is connected to OLED 602.

In another example, as shown in figure 8, switches set 650 can include being connected in series in the grid of driving transistor 606 Second switch transistor 178 and discharge transistor between extreme son and an electrode (for example, anode electrode) of OLED 602 168.The gate terminal of switching transistor 178 is connected to bias voltage line VB.The gate terminal of discharge transistor 168 is in node A Place is connected to the gate terminal of driving transistor 606.In light period, discharge transistor 168 is released in storage 612 The voltage being electrically charged.

In another example, as shown in figure 13, switches set 650 can include being connected in series in driving transistor 606 Second switch transistor 222 and electric discharge crystal between gate terminal and an electrode (for example, anode electrode) of OLED 602 Pipe 218.The gate terminal of switching transistor 222 is connected to selection line SEL [n+1].The gate terminal of discharge transistor 218 is in section The gate terminal of driving transistor 606 is connected at point A.In light period, discharge transistor 218 releases storage The voltage being electrically charged on 612.

In another example, as shown in figure 35, switches set 650 can include being connected in series in driving transistor 606 Discharge transistor 510 and regulation circuit 516 between gate terminal and an electrode (for example, anode electrode) of OLED 602. The gate terminal of discharge transistor is connected to control line CNT [n].Because the resistance for adjusting circuit 516 becomes according to pixel ageing Change, so adjusting the voltage that circuit 516 is provided for the adjustment node A together with discharge transistor 510.In one example, Adjust the transistor 218 that circuit 516 is Figure 13.In another example, the sensor 316 that circuit 516 is Figure 20 is adjusted.Sending out In photoperiod, discharge transistor 510 releases the voltage being electrically charged in storage 612.

According to these embodiments, image element circuit 600 provides constant average current in frame time.

Figure 40 illustrates the example of the image element circuit for applying pixel drive scheme in accordance with another embodiment of the present invention. In programming cycle, image element circuit 610 is programmed according to programming information, and in light period, is driven according to programming information Dynamic image element circuit 610 lights.The image element circuit 610 of Figure 40 includes OLED 602 and the drive circuit for driving OLED 602. OLED 602 is the luminescent device lighted in light period.OLED 602 has electric capacity 632.OLED 602 for example include anode, Luminescent layer between negative electrode and anode and negative electrode.

Drive circuit includes driving transistor 606, first switch transistor 608, second switch transistor 688, storage electricity Container 612, discharge transistor 686 and regulation transistor 646.In light period, the transmission driving current of driving transistor 606 is led to Cross OLED 602.In programming cycle, to charge to storage 612 based in part on the voltage of programming information.The One switching transistor 608 is operated according to selection line, and voltage is sent to into storage 612 in programming cycle. In light period, discharge transistor 686 releases the voltage in storage 612.Adjust transistor 646 and will leak out electric current biography The gate terminal of driving transistor 606 is delivered to, so as to adjust the grid voltage of driving transistor 606.

In one example, transistor 606,608,646 and 686 is n-type transistor.In another example, transistor 606th, 608,646 and 686 is p-type transistor, or the combination of n-type transistor and p-type transistor.In one example, transistor 606th, 608,646 and 686 include gate terminal, source terminal and drain terminal.

Transistor 606,608,646 and 686 can use non-crystalline silicon, nanometer/microcrystal silicon, polysilicon, organic semiconductor skill Art (for example, organic tft), NMOS/PMOS technologies or CMOS technology (for example, MOSFET) are manufacturing.

Driving transistor 606 is by switch or is disposed directly between voltage supply line VDD and OLED 602.Drive brilliant One terminal of body pipe 606 is connected to VDD.Another terminal of driving transistor 606 is connected to an electrode of OLED 602 (for example, anode electrode).The gate terminal of first switch transistor 608 is connected to selection line SEL.The one of switching transistor 608 Individual terminal is connected to data wire VDATA.Another terminal of switching transistor 608 is connected to node A.Storage 612 One terminal is connected to node A.Another terminal of storage 612 is connected to OLED 602 at node B.OLED 602 Another electrode (for example, cathode electrode) be connected to power line (for example, share ground connection).

The gate terminal of discharge transistor 686 is connected to control line CNT.Control line CNT can be with CNT [n] phase of Figure 35 Correspondence.One terminal of discharge transistor 686 is connected to node A.One terminal of second switch transistor 688 is connected to node A.Another terminal of discharge transistor 686 is connected to another terminal of second switch transistor 688 at node C.Second The gate terminal of switching transistor 688 is connected to node C.

A terminal for adjusting transistor 646 is connected to node C.The Second terminal for adjusting transistor 646 is connected to OLED 602 electrode (for example, anode electrode).The gate terminal for adjusting transistor is connected to node A.Therefore, transistor is adjusted 646 are offset to the sub-threshold region for providing very small current.However, in frame time, such small current changes enough driving The grid voltage of transistor 606.In higher temperature, the subthreshold current for adjusting transistor 646 is significantly increased, and it reduces drive The mean gate voltage of dynamic transistor 606.

According to this embodiment, image element circuit 610 provides constant average current in frame time.

Figure 41 illustrates the example of the image element circuit for applying the pixel drive scheme according to another embodiment of the invention. In programming cycle, image element circuit 620 is programmed according to programming information, and in light period, is driven according to programming information Dynamic image element circuit 620 lights.The image element circuit 620 of Figure 41 includes OLED 602 and the drive circuit for driving OLED 602. OLED 602 is the luminescent device lighted in light period.OLED 602 has electric capacity 632.OLED 602 for example include anode, Luminescent layer between negative electrode and anode and negative electrode.

The gate terminal of discharge transistor 686 is connected to control line CNT.Control line CNT can with the CNT [n] of Figure 35 or The control line CNT of Figure 40 is corresponding.One terminal of second switch transistor 688 is connected to node A.Second switch transistor 688 another terminal is connected to OLED 602 at node B.The gate terminal of second switch transistor connects at node B To OLED 602.

One terminal of discharge transistor 686 is connected to node A.Another terminal of discharge transistor 686 is connected to tune One terminal of section transistor 646.Another terminal for adjusting transistor 646 is connected to of OLED 602 at node B Electrode (for example, anode electrode).The gate terminal for adjusting transistor is connected to node A.Therefore, adjust transistor 646 to be biased Sub-threshold region in very small current is provided.However, in frame time, such small current changes enough driving transistor 606 grid voltage.In higher temperature, the subthreshold current for adjusting transistor 646 is significantly increased, and reduces driving transistor 606 mean gate voltage.

According to another embodiment, it is proposed that with the aobvious of the image element circuit 600,610 or 620 for driven for emitting lights device Show the operational approach of device.The method includes：In programming cycle, by turning on first switch transistor, to fill to image element circuit Electricity, so that voltage is charged to the node of the gate terminal for being connected to capacitor and driving transistor in image element circuit；It is logical Overregulate transistor and will leak out the gate terminal that electric current is sent to driving transistor, so as to adjust the voltage at the node；And And being driven according to programming information in the luminous light period of image element circuit, by amplifying transistor by the voltage at the node Discharge.

Embodiments in accordance with the present invention, even if backboard and OLED are unstable, drive circuit and put on the ripple of drive circuit Shape provides stable AMOLED and shows.Drive circuit and its waveform reduce the differential ageing impact of image element circuit.Embodiment In pixel layout do not need extra drive cycle or drive circuit, this realize including including mobile device and PDA just The low cost application of portable device.Additionally, as those of ordinary skill in the art appreciate, it is to temperature change and machinery Stress is insensitive.

Pass through to have illustrated one or more currently preferred embodiments as above.To people in the art For member, it is aobvious that can make many and change and modifications in the case of the scope of the invention limited without departing from claims Right.

Claims

1. a kind of display system, the system includes：

Image element circuit, the image element circuit is programmed and the basis in light period in programming cycle according to programming information The programming information and be driven to emit light, the image element circuit includes：

Luminescent device, the luminescent device is used to be lighted in the light period,

Driving transistor, the driving transistor is used for the transmission in the light period and drives current through the luminous organ Part, the driving transistor has gate terminal, source terminal and drain terminal,

Storage, using the voltage based in part on the programming information to the storage electricity in the programming cycle Condenser charge, the storage has the first terminal and Second terminal, and the first terminal is connected to the driving crystal The grid of pipe,

First switch transistor, the first switch transistor is operated according to first choice line, the first switch crystal Manage for the voltage to be sent to into the storage in the programming cycle, and

Transistor is adjusted, the regulation transistor is used to will leak out the gate terminal that electric current is sent to the driving transistor, from And the grid voltage of the driving transistor is adjusted, the regulation transistor has gate terminal, source terminal and drain terminal,

The gate terminal for adjusting transistor is connected to the Second terminal of the storage, the regulation transistor Source terminal and one of drain terminal be connected to the gate terminal of the driving transistor, and

Described source terminal and the other of drain terminal for adjusting transistor be connected directly to the luminescent device with it is described Node between driving transistor, and the Second terminal of the storage is connected to,

Wherein, the image element circuit provides constant average current in frame time.

2. system according to claim 1, also includes：

Array of display, the array of display includes the multiple described image element circuit arranged in the way of ranks, and

For driving the driver of the array of display.

3. system according to claim 1, also includes：

Data driver, the data driver charges according to the programming information to the storage, so as to via number The image element circuit is programmed according to line；

Gate drivers, the gate drivers are used for driving the first choice line；With

Controller, the controller is used for operating the data driver and the gate drivers.

4. system according to claim 2, wherein, more than one the described image element circuit in multiple image element circuits is total to Use offset line.

5. system according to claim 1, wherein, the regulation transistor is biased at sub-threshold region.

6. a kind of to the method that operated of display with the image element circuit for driven for emitting lights device, methods described bag Include：

In programming cycle the image element circuit is charged by turning on first switch transistor, voltage is charged to by tool with this There is the storage of the first terminal and Second terminal, the first terminal is connected to the gate terminal of driving transistor, described Driving transistor also has source terminal and drain terminal；And

By transmitting leakage current with the regulation transistor of gate terminal, source terminal and drain terminal, the regulation is brilliant The gate terminal of body pipe is connected to the Second terminal of the storage, the source terminal of the regulation transistor With the gate terminal that one of drain terminal is connected to the driving transistor, and the source terminal for adjusting transistor The other of son and drain terminal are connected directly to the node between the luminescent device and the driving transistor, and connect The Second terminal of the storage is connected to, so as to adjust the voltage at the node.

7. method according to claim 6, wherein, the image element circuit provides constant average current in frame time.

8. method according to claim 6, wherein, the first switch transistor is turned on by selection line.

9. method according to claim 6, wherein, the regulation transistor and the driving transistor have identical inclined Put condition.

10. method according to claim 6, wherein, the regulation transistor is offset to sub-threshold region.

11. methods according to claim 6, also include：

By turning on second switch transistor, the regulation transistor is forced to enter linear operating region.

12. methods according to claim 6, also include：

The energy transmission from the image element circuit is detected by sensor.

13. methods according to claim 12, wherein, the conductance for adjusting transistor according to the sensor is to described Voltage at node is discharged.