WO2014198083A1 - 一种像素电路及其驱动方法、显示装置 - Google Patents
一种像素电路及其驱动方法、显示装置 Download PDFInfo
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- WO2014198083A1 WO2014198083A1 PCT/CN2013/081292 CN2013081292W WO2014198083A1 WO 2014198083 A1 WO2014198083 A1 WO 2014198083A1 CN 2013081292 W CN2013081292 W CN 2013081292W WO 2014198083 A1 WO2014198083 A1 WO 2014198083A1
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- pixel circuit
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
- H10K59/1216—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being capacitors
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
- G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
- G09G3/325—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/067—Special waveforms for scanning, where no circuit details of the gate driver are given
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
Definitions
- the present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display device.
- OLED Organic Light Emitting Diode
- PMOLED Passive Matrix Driving OLED
- AMOLED Active Matrix Driving OLED
- each OLED includes a plurality of TFTCTliin Film Transistor (TFT) switching circuits.
- TFT switching circuits fabricated on large-area glass substrates are often Non-uniformity occurs in electrical parameters such as threshold voltage, mobility, etc., so that the current flowing through the AMOLED not only changes with the on-voltage stress generated by the long-time conduction of the TFT, but also with the TFT The threshold voltage drifts differently. As a result, the brightness uniformity and brightness constant of the display will be affected.
- the AMOLED in the operating state will also be in a bias state for a long time, the rate of attenuation of the display device is accelerated, thereby reducing the life of the display device.
- Embodiments of the present invention provide a pixel circuit, a driving method thereof, and a display device for compensating for threshold voltage drift of a TFT, improving unevenness of display brightness of the display device, and extending the display device The use of Shouyi.
- the invention provides a pixel circuit, including:
- a first transistor a second transistor, a third transistor, a fourth transistor, a fifth transistor, a storage capacitor, a second storage capacitor, and a light emitting device
- a gate of the first transistor is connected to a first pole of the third transistor, a first pole of the first transistor is connected to a second pole of the fifth transistor, and a second pole of the first transistor is connected a voltage
- the second transistor The gate is connected to the -, the first pole of the first : is connected to the second pole of the fourth transistor, and the second pole of the second transistor is connected to the second pole of the fifth transistor;
- the third transistor gate is connected to the first control line, the first pole of the second transistor is connected to the first storage electric end, and the second pole of the second transistor is connected to a variable voltage; a four transistor ⁇ gate is connected to the second control line, and a first pole of the fourth transistor is connected to the data line;
- the fifth transistor ⁇ is connected to the light-emitting control line, and the first electrode of the fifth transistor is connected to the anode of the light-emitting device;
- the second storage end is connected to the other end of the first storage capacitor, and the other end of the second storage capacitor is connected to the variable voltage;
- the cathode of the light emitting device is connected to a second voltage.
- a display device comprising the pixel device as described above, according to still another aspect of the present invention, a method for driving a pixel circuit, comprising: turning on a second transistor and a third transistor a fourth transistor, a fifth transistor, turning off the first transistor, simultaneously inputting a low level to the data line, and removing the charge of the anode of the light emitting device;
- the light emitting device emits light.
- the pixel circuit and the driving method thereof and the display device provided by the embodiment of the invention can perform switching and charge and discharge control on the circuit through a plurality of transistors and capacitors, so that the storage capacitor can maintain the gate source between the gate and the source of the first transistor.
- the voltage is constant, so that the current through the first transistor is independent of the threshold voltage and the first voltage of the first transistor, thereby compensating for the inconsistency or drift of the threshold voltage of the first transistor, and avoiding the resistance voltage drop of the first voltage (IR drap) has an effect on the current flowing through the light-emitting device, which significantly improves the uniformity of the display brightness of the display device.
- the charge of the anode of the light-emitting device is removed, and the light-emitting device is prevented from being in a positive bias state for a long time. Therefore, the rate of attenuation of the light emitting device is effectively slowed down, and the service life of the display device is greatly improved.
- FIG. 1 is a schematic diagram of a connection structure of a pixel circuit according to an embodiment of the present invention
- FIG. 2 is a timing chart of each signal line when the pixel circuit shown in FIG. 1 is driven;
- FIG. 3 is an equivalent circuit diagram of the pixel circuit shown in FIG. 1 in an initialization phase
- FIG. 4 is a schematic diagram of an equivalent circuit of the pixel circuit shown in FIG.
- FIG. 5 is an equivalent circuit diagram of the pixel circuit shown in FIG. 1 in a data input stage
- FIG. 6 is an equivalent circuit diagram of the pixel circuit shown in FIG.
- FIG. 7 is a schematic flowchart diagram of a pixel circuit driving method according to an embodiment of the present invention. detailed description
- the pixel circuit 1 provided by the embodiment of the present invention, as shown in FIG. 1, includes:
- the gate of the first transistor T1 is connected to the first pole of the third transistor T3, the first pole of the first transistor T1 is connected to the second pole of the fifth transistor T5, and the second pole of the first transistor T1 is connected to the first voltage (Vdd)
- the gate of the second transistor T2 is connected to the first control line Sti-1, the first electrode of the second transistor T2 is connected to the second electrode of the fourth transistor T4, and the second electrode of the second transistor T2 is connected to the second electrode of the fifth transistor T5. pole.
- the gate of the second transistor T3 is connected to the first control line Sn-1, the first terminal of the third transistor T3 is connected to one end of the first storage capacitor C1, and the second pole thereof is connected to the variable voltage (Vref).
- the gate of the fourth transistor T4 is connected to the second control line Sn, and the first electrode of the fourth transistor T4 is connected to the data line Data.
- the gate of the fifth transistor T5 is connected to the light emission control line Em, and the first electrode of the fifth transistor T5 is connected to the anode of the light emitting device L.
- One end of the second storage capacitor C2 is connected to the other end of the first storage capacitor CI, and the other end of the second storage capacitor C2 is connected to a variable voltage (Vref).
- the cathode of the light-emitting device L is connected to a second voltage (Vss).
- the light-emitting device L in the embodiment of the present invention may be a plurality of current-driven illuminations including LED (Light Emitting Diode) or OLED (Organic Light Emitting Diode) in the prior art. Device.
- LED Light Emitting Diode
- OLED Organic Light Emitting Diode
- the description is made by taking the 0 LED as an example.
- the pixel circuit and the driving method thereof and the display device provided by the embodiment of the invention can perform switching and charge and discharge control on the circuit through a plurality of transistors and capacitors, so that the storage capacitor can maintain the gate source between the gate and the source of the first transistor.
- the voltage is constant, so that the current through the first transistor is independent of the threshold voltage and the first voltage of the first transistor, thereby compensating for the inconsistency or drift of the threshold voltage of the first transistor, and avoiding the resistance voltage drop of the first voltage (IR drap) convection through the light emitting device
- the effect of the current significantly improves the uniformity of the display brightness of the display device.
- the light-emitting device is prevented from being in a positive bias state for a long time, thereby effectively reducing the attenuation of the light-emitting device.
- the rate greatly increases the life of the display device.
- the voltage Vdd may refer to a high voltage
- the voltage Vss may be a low voltage or a ground.
- the type of the first transistor T! is the same as or different from the type of the second transistor T2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5.
- the first transistor ⁇ !, the second transistor ⁇ 2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 may all be ⁇ -type transistors; or the first transistor ⁇ !
- the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 may both be ⁇ -type transistors; or the first transistor Ti, the second transistor T2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 may be both
- the first transistor T1 may be a ⁇ -type transistor
- the second transistor ⁇ 2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 may all be ⁇ -type transistors.
- the external control signals of the pixel circuits are also different.
- the first transistor T1, the second transistor ⁇ 2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 may each be a ⁇ type.
- the first pole Ti, the second transistor T2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 may each be referred to as a source, and the second pole may be referred to as a drain.
- the first transistor Ti, the second transistor T2, the second transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 are all ⁇ -type depletion TFTs, and the working process of the pixel circuit provided by the embodiment of the present invention is detailed. Description.
- Fig. 2 is a timing chart of each signal line during the operation of the pixel circuit shown in Fig. 1.
- the initialization phase, the acquisition phase, the data input phase, and the illumination phase are correspondingly represented by Pr, PI, P2, and P3, respectively.
- the first phase is the initialization phase.
- the equivalent circuit of this phase is shown in Figure 3.
- the actual power-on line and device are indicated by solid lines, and the unpowered cells are indicated by dashed lines.
- the following equivalent circuit diagrams are shown. The representation is the same as the figure.
- the first control line Sn-1, the second control line Sn, and the light emission control line Em are input to a high level, and the variable voltage (Vref) and the data voltage (Vdata) output from the data line Daia are at a low level.
- Vref variable voltage
- Vdata data voltage
- the second transistor T2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 are turned on, the first transistor T1 is turned off, and the first storage capacitor C1 and the second storage capacitor C2 are reset.
- the voltage at the node b of the first electrode of the second transistor T2 and the second electrode of the fourth transistor T4 is a low voltage (Vdata), so the anode potential of the light-emitting device L is the low potential (Vdata), so the light-emitting device
- the charge stored on L is output through the turned-on fifth transistor T5, the second transistor ⁇ 2, and the fourth transistor ⁇ 4, so that the charge stored between the OLED anode and the anode can be removed, thereby ensuring that it is not in positive
- the bias state which slows down the OLED attenuation, increases the life of the display device.
- the second phase is the acquisition phase, and the equivalent circuit of this phase is shown in Figure 4.
- the variable voltage (Vref) and the data voltage (Vdata) of the data line Data output are at a high level
- the first control line Sn-1 inputs a high level, a second control line Sn, and an illumination control line Em input.
- Low level As shown in FIG. 4, the fourth transistor T4 and the fifth transistor T5 are turned off, the second transistor T2 and the third transistor T3 are turned on, and the high level of the variable voltage (Vref) input causes the first transistor Ti to be turned on.
- the voltage at the node a of the gate of the first transistor Ti connected to the first pole of the second transistor T3 is a high voltage (Vref) because the voltage causes the first transistor T1 to be just turned on, thereby making the first storage capacitor
- Vref high voltage
- the third stage is the data input stage, and the equivalent circuit of this stage is shown in Figure 5.
- the variable voltage (Vref) and the data line (Vdata) of the data line Data output are at a high level
- the second control line Sn is input to a high level
- the first control line Sn i and the light emission control line Em are input to a low level.
- the second transistor T2, the second transistor ⁇ 3, and the fifth transistor ⁇ 5 are turned off, the fourth transistor ⁇ 4 is turned on
- the data voltage (Vdata) output from the data line Data is stored in the second storage capacitor C2.
- the voltage of node b is (Vdata). Since the threshold voltage Vth of the first transistor in the second stage is already stored in the first storage capacitor C1, the potential of the node a is raised to:
- the fourth stage is the lighting stage, and the equivalent circuit of this stage is shown in Figure 6.
- the variable voltage (Vref) the illumination control line Em is at a high level
- the first control line Sn-1 the second control line Sn
- the data voltage (Vdata) output from the data line Data is input low.
- the second transistor T2, the third transistor ⁇ 3, and the fourth transistor ⁇ 4 are turned off, and the first transistor T1 and the fifth transistor ⁇ 5 are turned on.
- Vdata is the data voltage
- Vref is the variable voltage
- Vth is the threshold voltage of the transistor.
- the Vth between different pixel units is not the same, and the Vth in the same pixel may drift over time, which will cause a difference in display brightness. Since this difference is related to the previously displayed image, it is often Presented as an afterimage phenomenon.
- the current IOLED for driving the OLED light emission is independent of the threshold voltage Vth of the first transistor T1, and the current is also not controlled by the first voltage (Vdd). Therefore, the effect of the transistor threshold voltage non-uniformity and the first voltage drop (I-R drop) on the display effect is eliminated.
- the storage capacitor can keep the gate-source voltage between the gate and the source of the first transistor unchanged, thereby making the current through the first transistor and the first
- the threshold voltage of the transistor is independent of the first voltage, thereby compensating for the inconsistency or drift of the threshold voltage of the first transistor, avoiding the influence of the IR drop of the first voltage on the current flowing through the light emitting device, and significantly improving the display of the display device.
- the light-emitting device is prevented from being in a positive bias state for a long time, thereby effectively slowing down the rate of attenuation of the light-emitting device and greatly improving the service life of the display device.
- the transistors are all described by taking an N-type depletion TFT as an example.
- an N-type enhancement type TFT can be used in the same manner, in that, for a depletion type TFT, the threshold voltage Vth is a negative value, and for an enhancement type TFT, the threshold voltage Vth is a positive value.
- the first transistor T1 may also adopt an N-type transistor
- the second transistor T2 the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 may each be a ⁇ -type transistor, and drive an external signal of the pixel circuit of such a structure.
- the timing of the timing should also be adjusted accordingly, wherein the timings of the first control line Sn-1, the second control line Sn, and the illumination control line Em are corresponding to the corresponding signals shown in FIG.
- the timing of the numbers is reversed (ie, the phase difference between the two is 180 degrees).
- the first transistor T1, the second transistor ⁇ 2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 are all ⁇ -type transistors, and the timing of driving external signals of the pixel circuit of such a structure should also be corresponding.
- the timing of the first control line Sn-1, the second control line Sru variable voltage (Vref), the data voltage (Vdata), and the illumination control line Em is opposite to the timing of the corresponding signal shown in FIG. 2 (ie, The phase difference between the two is 180 degrees).
- the first transistor T1 is a P-type transistor
- the second transistor T2 the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 are all ⁇ -type transistors, and the timing of driving an external signal of the pixel circuit of such a structure is also Corresponding adjustments should be made in which the timing of the variable voltage Vref and the data voltage (Vdata) is opposite to the timing of the corresponding signal shown in Fig. 2 (i.e., the phase difference between the two is 180 degrees).
- the embodiment of the invention further provides a display device comprising any of the pixel circuits as described above.
- the display device may comprise a plurality of pixel cell arrays, each pixel cell comprising any one of the pixel circuits as described above.
- the display device provided by the embodiment of the present invention may be a display device having a current-driven light-emitting device including an LED display or an OLED display.
- the display device provided by the embodiment of the invention includes a pixel circuit, and the switching, charging and discharging control of the circuit by using a plurality of transistors and capacitors enables the storage capacitor to maintain the gate-source voltage between the gate and the source of the first transistor. Therefore, the current passing through the first transistor is independent of the threshold voltage and the first voltage of the first transistor, thereby compensating for the inconsistency or drift of the first transistor voltage, avoiding the flow of the first voltage I-R drop The influence of the current of the light-emitting device significantly improves the uniformity of the display brightness of the display device.
- the light-emitting device is prevented from being in a positive bias state for a long time, thereby effectively reducing the light-emitting device.
- the rate of attenuation greatly increases the life of the display device.
- the pixel circuit driving method provided by the embodiment of the present invention can be applied to the pixel circuit provided in the foregoing embodiment. As shown in FIG. 7, the method includes:
- Step S701 guiding the second transistor, the second transistor, the fourth transistor, and the fifth transistor to turn off the first transistor, simultaneously inputting a low level to the data line, and clearing the charge of the anode of the light emitting device.
- Step S702 turning off the fourth transistor and the fifth transistor, turning on the second transistor and the third transistor, the variable voltage control first transistor is turned on, and the first transistor threshold voltage is stored in the first storage capacitor;
- Step S703 turning on the fourth transistor, turning off the second transistor, the third transistor, and the fifth transistor, and storing the high level input to the data line in the second storage capacitor;
- Step S704 turning off the second transistor, the third transistor and the fourth transistor, turning on the first transistor and the fifth transistor, and driving the light emitting device to emit light through currents of the first transistor and the fifth transistor.
- the pixel circuit driving method provided by the embodiment of the invention can perform switching and charge and discharge control on the circuit through a plurality of transistors and capacitors, so that the storage capacitor can keep the gate-source voltage between the gate and the source of the first transistor unchanged, thereby
- the current passing through the first transistor is independent of the threshold voltage and the first voltage of the first transistor, thereby compensating for the inconsistency or drift of the threshold voltage of the first transistor, and avoiding the current flowing through the light emitting device by the IR drop of the first voltage
- the effect is significantly improved the uniformity of the display brightness of the display device.
- the light-emitting device is prevented from being in a positive bias state for a long time, thereby effectively reducing the rate of attenuation of the light-emitting device. , greatly improving the service life of the display device.
- the light emitting device in the embodiment of the present invention may be a plurality of current driving light emitting devices including LEDs or 0LEDs in the prior art.
- the type of the first transistor T1 is the same as or different from the type of the second transistor T2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5.
- the first transistor, the second transistor, the third transistor, the fourth transistor, and the fifth transistor may each be a ⁇ -type transistor; or the first transistor is a ⁇ -type transistor, the second transistor ⁇ 2, the third transistor ⁇ 3, and the fourth transistor
- the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, and the fifth transistor T5 are all germanium transistors; or the first transistor T1 is The ⁇ -type transistor, the second transistor ⁇ 2, the second transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 are all ⁇ -type transistors.
- the first transistor T1, the second transistor ⁇ 2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 may each be a ⁇ type.
- the timing of the control signal may be as shown in FIG. 2, including:
- Initialization phase input a high level to the first control line, the second control line, and the illumination control line, and input a low level to the variable voltage and the data line;
- Acquisition phase input a low level to the second control line and the illumination control line, and input a high level to the first control line, the variable voltage, and the data line;
- Data input phase input low level to the first control line and the light control line, and input high level to the second control line, the variable voltage and the data line;
- Illumination phase Input a low level to the first control line, the second control line, and the data line, and input a high level to the variable voltage and the illumination control line.
- step S70I may specifically include:
- This step is an initialization phase.
- the first control line Sn-1, the second control line Sn, and the illumination control line Em input a high level, a variable voltage (Vref), and a data line Data.
- the output data voltage (Vdata) is low.
- the second transistor T2, the third transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 are turned on, the first transistor T1 is turned off, and the first storage capacitor C1 and the second storage capacitor C2 are reset.
- the voltage at the node b of the first electrode of the second transistor T2 and the second electrode of the fourth transistor T4 is a low voltage (Vdata), so the anode potential of the light-emitting device L is the low voltage (Vdata), so the light-emitting device
- the charge stored on L is output through the turned-on fifth transistor T5, the second transistor ⁇ 2, and the fourth transistor ⁇ 4, so that the charge stored for a long time in the OLED anode can be removed, thereby ensuring that it is not in a positive bias. The state, thereby slowing down the speed of OLED attenuation and increasing the life of the display device.
- step S702 may specifically include:
- the step is an acquisition phase in which the variable voltage (Vref) and the data voltage (Vdata) of the data line Data output are at a high level, and the first control line Sn-1 is input with a high level to the second control.
- the line Sn and the light emission control line Em are input to a low level.
- the fourth transistor T4 is turned off, the fifth transistor T5, the second transistor T2, and the third transistor T3 are turned away, and the high level of the variable voltage (Vref) input causes the first transistor Ti to be turned on.
- Gate of the first transistor T1 and the second transistor The voltage at the node a connected to the first pole of T3 is a high voltage (Vref) because the voltage causes the first transistor T! to be turned on, so that the potential at the same point as the other end of the first storage capacitor is raised to Vref ⁇ Vih, where Vih is the threshold voltage of the first transistor, which is stored in the first storage capacitor C!.
- Step S703 specifically includes:
- This step is a data input phase in which the variable voltage (Vref) and the data voltage (Vdata) of the data line Data output are at a high level, and a high level is input to the second control line Sn, to the first control line Sii. l and the light control line Em input low level.
- the second transistor T2, the third transistor ⁇ 3, and the fifth transistor ⁇ 5 are turned off, the fourth transistor ⁇ 4 is turned on, and the data voltage (Vdata) output from the data line Data is stored in the second storage capacitor C2.
- the voltage of node b is (Vdata). Since the threshold voltage Vth of the first transistor in the second stage is already stored in the first storage capacitor C1, the potential of the node a is raised to:
- Step S704 specifically includes:
- This step is a light-emitting phase.
- the variable voltage (Vref) and the light-emission control line Em are at a high level, and the data voltage (Vdata) output to the first control line Sn-1, the second control line Sn, and the data line Data (Vdata) ) Input low level.
- the second transistor T2, the second transistor ⁇ 3, and the fourth transistor ⁇ 4 are turned off, and the first transistor T1 and the fifth transistor ⁇ 5 are turned on.
- the voltage at which the first transistor is turned on is the voltage at the node a in the second phase, that is, Vgs::::Vdata+Vth, so the current flowing through the first transistor T1 drives the OLED to emit light, and the current IOLED and the first
- the threshold voltage Vth of a transistor T1 is independent, and the current is also not controlled by the first voltage (Vdd). Therefore, the transistor threshold voltage non-uniformity and the resistance voltage drop of the first voltage I-R drop are eliminated.
- the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
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