WO2019019622A1 - 像素电路及其驱动方法、显示面板和显示装置 - Google Patents
像素电路及其驱动方法、显示面板和显示装置 Download PDFInfo
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- WO2019019622A1 WO2019019622A1 PCT/CN2018/077011 CN2018077011W WO2019019622A1 WO 2019019622 A1 WO2019019622 A1 WO 2019019622A1 CN 2018077011 W CN2018077011 W CN 2018077011W WO 2019019622 A1 WO2019019622 A1 WO 2019019622A1
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- 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2230/00—Details of flat display driving waveforms
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
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- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Definitions
- Embodiments of the present disclosure relate to a pixel circuit and a method of driving the same, a display panel, and a display device.
- OLED Organic Light Emitting Diode
- LCD liquid crystal display
- OLED display has low energy consumption, low production cost, self-illumination, wide viewing angle and The response speed is fast.
- LCDs that use a stable voltage to control brightness
- OLEDs are driven by current and require a constant current to control their illumination. Due to process process and device aging, etc., the threshold voltage Vth of the driving transistor in the pixel circuit may be non-uniform, which causes a difference in current flowing through each OLED to cause uneven display brightness, thereby affecting the display of the entire image. effect.
- the current flowing through each OLED is related to the source of the driving transistor, that is, the power supply voltage, due to the voltage drop (IR Drop), the current difference in different regions may also occur, thereby causing uneven brightness of the OLEDs in different regions.
- At least one embodiment of the present disclosure provides a pixel circuit including: a data writing circuit, a compensation control circuit, a storage circuit, an illumination control circuit, and a driving circuit.
- the data writing circuit is respectively connected to the first control signal end, the data signal end and the first node; the data writing circuit is configured to provide the signal of the data signal end to the control of the first control signal end to The first node.
- the storage circuit is respectively connected to the first node, the control end of the driving circuit, and the second end of the driving circuit; the storage circuit is configured to maintain the first node and the control end of the driving circuit A voltage difference between the two, and maintaining a voltage difference between the first node and the second end of the drive circuit.
- the compensation control circuit is respectively connected to a second control signal end, a control end of the drive circuit, and a first end of the drive circuit; the compensation control circuit is configured to enable the control under the control of the second control signal end
- the control terminal of the driving circuit is electrically connected to the first end of the driving circuit.
- the illuminating control circuit is respectively connected to the illuminating control signal end, the first power end, and the first end of the driving circuit; the illuminating control circuit is configured to: at the first power end under the control of the illuminating control signal end A signal is provided to the drive circuit.
- the driving circuit is respectively connected to the compensation control circuit, the illumination control circuit and the storage circuit; the drive circuit is configured to output a drive current.
- the storage circuit includes a first storage circuit and a second storage circuit.
- the first storage circuit is respectively connected to the first node and a control end of the driving circuit; the first storage circuit is configured to maintain a voltage difference between the first node and a control end of the driving circuit .
- the second storage circuit is respectively connected to the first node and the second end of the driving circuit; the second storage circuit is configured to maintain a voltage difference between the first node and the second end of the driving circuit.
- a pixel circuit provided by an embodiment of the present disclosure further includes a light emitting element.
- a first pole of the light emitting element is connected to the second end of the driving circuit and the storage circuit, and a second pole of the light emitting element is connected to a second power terminal; the light emitting component is used in the driving circuit The light is emitted by the output drive current.
- the driving circuit includes a driving transistor.
- a gate of the driving transistor is connected as a control end of the driving circuit to the memory circuit and the compensation control circuit, a first pole of the driving transistor is used as a first end of the driving circuit, and the compensation control
- the circuit and the illumination control circuit are connected, and a second pole of the drive transistor is connected to the storage circuit as a second end of the drive circuit.
- the first storage circuit includes a first capacitor.
- the first end of the first capacitor is connected to the first node, and the second end of the first capacitor is connected to the control end of the driving circuit.
- the second storage circuit includes a second capacitor.
- the first end of the second capacitor is connected to the first node, and the second end of the second capacitor is connected to the second end of the driving circuit.
- a capacitance value of the first capacitor is greater than a capacitance value of the second capacitor.
- the data writing circuit includes a first switching transistor. a gate of the first switching transistor is connected to the first control signal end, a first pole of the first switching transistor is connected to the data signal end, and a second pole of the first switching transistor is The first node is connected.
- the compensation control circuit includes a second switching transistor. a gate of the second switching transistor is connected to the second control signal end, a first pole of the second switching transistor is connected to a control end of the driving circuit, and a second pole of the second switching transistor is The first end of the driving circuit is connected.
- the light emission control circuit includes a third switching transistor. a gate of the third switching transistor is connected to the light emission control signal end, a first pole of the third switching transistor is connected to the first power terminal, and a second pole of the third switching transistor is The first end of the drive circuit is connected.
- the driving transistor is an N-type transistor.
- the switching transistor is a P-type transistor or an N-type transistor.
- At least one embodiment of the present disclosure also provides a display panel including a plurality of pixel units distributed in an array, each of the pixel units including any of the pixel circuits provided in an embodiment of the present disclosure.
- At least one embodiment of the present disclosure also provides a display device including a display panel as provided by an embodiment of the present disclosure.
- a display device further includes a plurality of first control signal lines, a plurality of second control signal lines, a plurality of light emission control signal lines, and a plurality of data signal lines.
- the first control signal line of each row is connected to the first control signal end in the row of pixel circuits; the second control signal line of each row and the second control signal end of the row of pixel circuits.
- the light-emitting control signal lines of each row are connected to the light-emission control signal terminals of the pixel circuits of the row; the data signal lines of each column are connected to the data signal terminals of the pixel circuits of the column.
- At least one embodiment of the present disclosure also provides a driving method of a pixel circuit, including: a reset and compensation phase, a data writing phase, and an illumination phase.
- the compensation control circuit turns on the control end of the driving circuit and the first end of the driving circuit under the control of the second control signal end;
- the data writing phase the a data writing circuit supplies a signal of the data signal end to the first node under control of the first control signal end;
- the storage circuit maintains control of the first node and the driving circuit a voltage difference between the terminals, and maintaining a voltage difference between the first node and the second end of the driving circuit;
- the lighting control circuit provides the signal of the first power terminal to the control of the lighting control signal end to The driving circuit;
- the driving circuit outputs a driving current.
- 1 is a schematic diagram of a pixel circuit
- FIG. 2 is a schematic diagram of a pixel circuit according to an embodiment of the present disclosure
- FIG. 3 is a schematic diagram of another pixel circuit according to an embodiment of the present disclosure.
- FIG. 4 is a circuit diagram of a specific implementation example of a pixel circuit according to an embodiment of the present disclosure
- FIG. 5 is a circuit timing diagram of a driving method according to an embodiment of the present disclosure.
- FIG. 6 is a simulation diagram of a pixel circuit according to an embodiment of the present disclosure.
- FIG. 7 is a schematic flowchart diagram of a driving method of a pixel circuit according to an embodiment of the present disclosure.
- FIG. 8 is a schematic diagram of a display device according to an embodiment of the present disclosure.
- the transistors used in the embodiments of the present disclosure may each be a thin film transistor or a field effect transistor or other switching device having the same characteristics.
- a thin film transistor is taken as an example for description.
- the source and drain of the transistor used here may be structurally symmetrical, so that the source and the drain may be structurally indistinguishable.
- the embodiment of the present disclosure in order to distinguish the two poles of the transistor except the gate, one of the first poles and the other pole are directly described.
- the switching transistor employed in the embodiments of the present disclosure may include any one of a P-type switching transistor and an N-type switching transistor, wherein the P-type switching transistor is turned on when the gate is at a low level, and is turned off when the gate is at a high level.
- the N-type switching transistor is turned on when the gate is at a high level and turned off when the gate is at a low level.
- the pixel circuit is composed of a driving transistor M0, a switching transistor M, and a storage capacitor Cs.
- the scan line Scan selects a certain row, the scan line Scan inputs a low level signal, the P-type switch transistor M is turned on, and the voltage on the data line Data is written to the storage capacitor Cs; when the line scan ends, the scan line Scan input
- the signal changes to a high level, the P-type switching transistor M is turned off, and the gate voltage stored by the storage capacitor Cs causes the driving transistor M0 to generate a current to drive the OLED, ensuring that the OLED continues to emit light within one frame.
- the threshold voltage Vth of the driving transistor M0 may drift due to process process and device aging, etc., and since the current is related to the power supply voltage, Due to the voltage drop (IR Drop), the source voltage Vs of the driving transistor is also different, so that the current flowing through each OLED changes due to the variation of the threshold voltage Vth of the driving transistor and the source voltage of the driving transistor, thereby Causes uneven brightness of the image.
- At least one embodiment of the present disclosure provides a pixel circuit including a data write circuit, a compensation control circuit, a first storage circuit, a second storage circuit, an illumination control circuit, and a drive circuit. At least one embodiment of the present disclosure also provides a driving method, a display panel, and a display device corresponding to the pixel circuit.
- the pixel circuit, the display panel, the display device and the driving method provided by the embodiments of the present disclosure can make the current output by the driving circuit in the pixel circuit only related to the data voltage and the reference voltage of the data signal end, and is independent of the threshold voltage of the driving circuit.
- the influence of the threshold voltage of the driving circuit on the current output by the driving circuit can be avoided, so that the current outputted by the driving circuit is kept stable, and the uniformity of the brightness of the display screen of the display device including the pixel circuit can be improved.
- At least one embodiment of the present disclosure provides a pixel circuit including, as shown in FIG. 2, a data writing circuit 1, a storage circuit 2, a compensation control circuit 4, an illumination control circuit 5, and a drive circuit 6.
- the data writing circuit 1 is respectively connected to the first control signal terminal G1, the data signal terminal Data and the first node A; the data writing circuit 1 is configured to provide the signal of the data signal terminal Data under the control of the first control signal terminal G1.
- the signal of the data signal terminal Data is a data voltage that controls the degree of brightness of the pixel.
- the memory circuit 2 is connected to the first node A, the control terminal 60 of the drive circuit 6, and the second terminal 62 of the drive circuit 6, respectively.
- the memory circuit 2 is for maintaining a voltage difference between the first node A and the control terminal 60 of the drive circuit 6, and maintaining a voltage difference between the first node A and the second terminal 62 of the drive circuit 6.
- the compensation control circuit 4 is respectively connected to the second control signal terminal G2, the control terminal 60 of the driving circuit 6, and the first terminal 61 of the driving circuit 6, and the compensation control circuit 4 is configured to drive the driving circuit under the control of the second control signal terminal G2.
- the control terminal 60 of 6 is electrically connected to the first terminal 61 of the drive circuit 6.
- the illuminating control circuit 5 is respectively connected to the illuminating control signal terminal EM, the first power terminal VDD and the first end 61 of the driving circuit 6.
- the illuminating control circuit 5 is configured to turn the first power terminal VDD under the control of the illuminating control signal terminal EM.
- the signal is provided to the drive circuit 6, for example to the first end 61 of the drive circuit 6.
- the drive circuit 6 is connected to the compensation control circuit 4, the illumination control circuit 5, and the storage circuit 2, respectively, and the drive circuit 6 is for outputting a drive current.
- the drive circuit 6 outputs the drive current from the second terminal 62, for example, the drive current can be used to drive the light emitting element to emit light.
- the pixel circuit provided by the embodiment of the present disclosure includes a data writing circuit, a compensation control circuit, a storage circuit, an illumination control circuit, and a driving circuit.
- the data writing circuit is configured to provide a signal of the data signal end to the first node under the control of the first control signal end;
- the storage circuit is configured to maintain a voltage difference between the first node and the control end of the driving circuit, and maintain the first node a voltage difference from the second end of the driving circuit;
- the compensation control circuit is configured to make the control end of the driving circuit and the first end of the driving circuit conductive under the control of the second control signal end; and the lighting control circuit is used for controlling the light emitting control signal end
- the signal of the first power terminal is supplied to the driving circuit, and the driving circuit is used for outputting the driving current.
- the current outputted by the driving circuit in the pixel circuit can be related only to the data voltage and the reference voltage of the data signal end, and is independent of the threshold voltage of the driving circuit and the voltage of the second power terminal, thereby avoiding The threshold voltage of the driving transistor and the influence of the voltage drop on the current outputted by the driving circuit stabilize the current outputted by the driving circuit, thereby improving the uniformity of the brightness of the display screen of the display device including the pixel circuit.
- the storage circuit 2 may include a first storage circuit 21 and a second storage circuit 22,
- the first storage circuit 21 is connected to the first node A and the control terminal 60 of the drive circuit 6, respectively, and the first storage circuit 21 is for maintaining a voltage difference between the first node A and the control terminal 60 of the drive circuit 6.
- the second storage circuit 22 is connected to the first node A and the second end 62 of the drive circuit 6, respectively, and the second storage circuit 22 is for maintaining the voltage difference between the first node A and the second end 62 of the drive circuit 6.
- the pixel circuit may further include a light emitting element LE.
- the first pole of the light-emitting element LE is connected to the second end 62 of the drive circuit 6 and the second storage circuit 3, and the second pole of the light-emitting element LE is connected to the second power supply terminal VSS.
- the light-emitting element LE is used to emit light by the driving current output from the drive circuit 6.
- the light-emitting element LE realizes light emission under the action of a current when the drive circuit is in a saturated state.
- the light-emitting element LE may be an organic light-emitting diode (OLED).
- OLED organic light-emitting diode
- the embodiments of the present disclosure include, but are not limited to, the following embodiments are described by using an OLED as an example, and details are not described herein.
- the anode of the OLED may be connected to the second end 62 of the driving circuit 6, and the cathode of the OLED may be connected to the second power supply terminal VSS.
- the OLED may be of various types, such as a top emission, a bottom emission, or the like, and may emit red light, green light, blue light, or white light, etc., which is not limited by the embodiments of the present disclosure.
- the OLED also has a threshold voltage, and emits light when the voltage across the OLED is greater than or equal to the threshold voltage.
- the voltage of the first power terminal VDD is a high level voltage
- the voltage of the second power terminal VSS is grounded or a low level voltage
- the pixel circuit shown in FIG. 3 can be embodied as the pixel circuit structure shown in FIG.
- the pixel circuit includes a driving transistor M0, a first switching transistor M1, a second switching transistor M2, a third switching transistor M3, a first capacitor C1, a second capacitor C2, and a light emitting element OLED.
- the transistors in the pixel circuit are all described by taking an N-type transistor as an example.
- the drive circuit 6 can be implemented as the drive transistor M0.
- the gate of the driving transistor M0 is connected as the control terminal 60 of the driving circuit 6 to the first storage circuit 21 and the compensation control circuit 4, and the first electrode of the driving transistor M0 serves as the first terminal 61 and the compensation control circuit 4 of the driving circuit 6 and emits light.
- the control circuit 5 is connected, and the second electrode of the driving transistor M0 is connected as the second terminal 62 of the driving circuit 6 and the second storage circuit 22.
- the first storage circuit 21 can be implemented as a first capacitor C1.
- the first end of the first capacitor C1 is connected to the first node A, and the second end of the first capacitor C1 is connected to the control end of the driving circuit 6.
- the driving circuit 6 is implemented as the driving transistor M0
- the second end of the first capacitor C1 may be connected to the gate of the driving transistor M0.
- the first capacitor C1 is charged under the common control of the signal of the first node A and the signal of the gate of the driving transistor M0; and the signal and the driving transistor at the first node A Discharging is performed under the common control of the signal of the gate of M0; and when the gate of the driving transistor M0 is in the floating state, the voltage difference between the gates of the first node A and the driving transistor M0 is kept stable to drive the transistor
- the threshold voltage Vth of M0 and the data voltage input to the data signal terminal Data are stored on the gate of the driving transistor M0.
- the above is only a specific structure of the first storage circuit 21 in the pixel circuit.
- the specific structure of the first storage circuit 21 is not limited to the above-mentioned structure provided by the embodiment of the present disclosure, and may be known to those skilled in the art. Other structures are not limited here.
- the second storage circuit 22 can be implemented as a second capacitor C2.
- the first end of the second capacitor C2 is connected to the first node A, and the second end of the second capacitor C2 is connected to the second end of the driving circuit 6.
- the driving circuit 6 is implemented as the driving transistor M0
- the second end of the second capacitor C2 may be connected to the second electrode of the driving transistor M0.
- the second end of the second capacitor C2 can also be connected to the anode of the light-emitting element OLED.
- the second capacitor C2 is charged under the common control of the signal of the first node A and the signal of the second pole of the driving transistor M0, and the signal and driving at the first node A are performed. Discharging under the common control of the signal of the second pole of the transistor M0; and maintaining the voltage difference between the first node A and the second pole of the driving transistor M0 stable when the light emitting element OLED is in the light emitting state, to ensure the output of the driving transistor M0 Stable drive current.
- the above is only a specific structure of the second storage circuit 22 in the pixel circuit.
- the specific structure of the second storage circuit 22 is not limited to the above-mentioned structure provided by the embodiment of the present disclosure, and may be known to those skilled in the art. Other structures are not limited here.
- the capacitance value of the first capacitor C1 is relatively large. In order to reduce the space occupied area, the capacitance value of the second capacitor C2 is relatively small. Therefore, in the pixel circuit provided by one embodiment of the present disclosure, the capacitance value of the first capacitor C1 may be greater than the capacitance value of the second capacitor C2.
- the data writing circuit 1 can be implemented as the first switching transistor M1.
- the gate of the first switching transistor M1 is connected to the first control signal terminal G1
- the first pole of the first switching transistor M1 is connected to the data signal terminal Data
- the second pole of the first switching transistor M1 is connected to the first node A.
- the signal of the data signal terminal Data may be supplied to the first node A.
- the above is only a specific structure of the data writing circuit 1 in the pixel circuit.
- the specific structure of the data writing circuit 1 is not limited to the above-mentioned structure provided by the embodiment of the present disclosure, and may be known to those skilled in the art. Other structures are not limited here.
- the compensation control circuit 4 can be implemented as a second switching transistor M2.
- the gate of the second switching transistor M2 is connected to the second control signal terminal G2, the first pole of the second switching transistor M2 is connected to the control terminal of the driving circuit 6, and the second pole of the second switching transistor M2 is connected to the driving circuit 6. Connected at one end.
- the driving circuit 6 is implemented as the driving transistor M0
- the first electrode of the second switching transistor M2 may be connected to the gate of the driving transistor M0
- the second electrode of the second switching transistor M2 may be coupled to the first electrode of the driving transistor M0. connection.
- the second switching transistor M2 can conduct the gate of the driving transistor M0 and the first electrode of the driving transistor M0 under the control of the second control signal terminal G2 to control The drive transistor M0 is in a diode connected state.
- the above is only a specific structure of the compensation control circuit 4 in the pixel circuit.
- the specific structure of the compensation control circuit 4 is not limited to the above-mentioned structure provided by the embodiments of the present disclosure, and may be other known to those skilled in the art. Structure, not limited here.
- the illumination control circuit 5 can be implemented as a third switching transistor M3.
- the gate of the third switching transistor M3 is connected to the light-emitting control signal terminal EM, the first pole of the third switching transistor M3 is connected to the first power terminal VDD, and the second pole of the third switching transistor M3 is connected to the first terminal of the driving circuit.
- the driving circuit 6 is implemented as the driving transistor M0, the second electrode of the third switching transistor M3 may be connected to the first electrode of the driving transistor M0.
- the third switching transistor M3 can supply the voltage of the first power terminal VDD to the first pole of the driving transistor M0 under the control of the light emission control signal terminal EM, and the driving transistor The driving current of the second pole output of M0 is output to, for example, the light emitting element OLED to drive its light emission.
- the above is only a specific structure of the illuminating control circuit 5 in the pixel circuit.
- the specific structure of the illuminating control circuit 5 is not limited to the above-mentioned structure provided by the embodiments of the present disclosure, and may be other known to those skilled in the art. Structure, not limited here.
- the driving transistor M0 is an N-type transistor.
- the first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 may be in addition to the N-type transistor as shown in FIG. P-type transistors may be used or P-type transistors and N-type transistors may be mixed, as long as the port polarities of the selected types of transistors are simultaneously connected in accordance with the port polarity of the corresponding transistor in the embodiment of the present disclosure.
- the driving transistor M0 and all of the switching transistors M1-M3 are N-type transistors.
- the N-type switching transistor is turned on under a high potential and turned off under a low potential.
- the driving transistor M0 is an N-type transistor, and all switching transistors are N-type transistors, and the corresponding timing chart is as shown in FIG. 5. Specifically, the three stages of the reset and compensation phase T1, the data writing phase T2, and the lighting phase T3 in the timing chart shown in FIG. 5 are selected for description.
- the first switching transistor M1, the second switching transistor M2, and the driving transistor M0 are both in an on state, and the third switching transistor M3 is in an off state.
- the turned-on second switching transistor M2 can turn on the gate of the driving transistor M0 and its first electrode, so that the driving transistor M0 is in a diode-connected state, and thus the voltage of the gate and source of the driving transistor M0 is released through the light-emitting element OLED. , that is, the reset of the pixel circuit is realized.
- the first switching transistor M1 and the driving transistor M0 are both in an on state, and the second switching transistor M2 and the third switching transistor M3 are both in an off state.
- the voltage written by the data signal terminal Data is Vdata, that is, the turned-on first switching transistor M1 supplies the voltage Vdata of the data signal terminal Data to the first node A, so the voltage V A of the first node A is One stage of Vref becomes Vdata.
- the third switching transistor M3 and the driving transistor M0 are both in an on state, and the first switching transistor M1 and the second switching transistor M2 are in an off state.
- the voltage change at the second end of the second capacitor C2 is coupled to the first node of the second capacitor C2, that is, the first node A, so the voltage of the first node A becomes V.
- A Vdata + Voled-Voled0.
- the first pole voltage of the driving transistor M0 is the voltage V DD of the first power terminal VDD, and the driving transistor M0 is in a saturated state. According to the saturation state current characteristic, the operating current I flowing through the driving transistor M0 for driving the light emitting element OLED to emit light is known. OLED satisfies the formula:
- I OLED K(Vgs–Vth) 2
- K is a structural parameter, and this value is relatively stable in the same structure and can be counted as a constant. It can be seen that the operating current I OLED of the light emitting element OLED can be unaffected by the threshold voltage Vth of the driving transistor M0, and is independent of the voltage V SS of the second power supply terminal VSS, and only the data voltage Vdata and the reference of the data signal terminal Data.
- the voltage Vref is related to the influence of the threshold voltage Vth drift of the driving transistor M0 and the voltage drop (IR Drop) on the operating current I OLED of the light emitting element OLED due to the process process and long-time operation.
- the I OLED is also independent of the threshold voltage Voled0 and the operating voltage Voled of the OLED, and the difference in current due to aging of the OLED can be avoided, thereby improving the unevenness of the panel display.
- the pixel circuit provided by the embodiment of the present disclosure can compensate the threshold voltage Vth of the driving transistor M0 by using only 4 transistors and 2 capacitors, and the structure is relatively simple.
- the present disclosure also performs simulation simulation on the pixel circuit provided by the above embodiment in three stages, and the simulation result is shown in FIG. 6.
- the current flows through the operating current I OLED of the light-emitting element OLED at a time of 1.2447 ms.
- the pixel circuit provided in the disclosure, the light emitting element OLED operating current I OLED can be the threshold voltage Vth of the transistor M0 is not driven.
- the embodiment of the present disclosure further provides a driving method, which can be used in any of the pixel circuits provided by the embodiments of the present disclosure.
- the driving method includes the following operational steps.
- Step S701 In the reset and compensation phase, the compensation control circuit turns on the control end of the driving circuit and the first end of the driving circuit under the control of the second control signal end;
- Step S702 In the data writing phase, the data writing circuit provides the signal of the data signal end to the first node under the control of the first control signal end;
- Step S703 In the light emitting phase, the storage circuit maintains a voltage difference between the first node and the control end of the driving circuit, and maintains a voltage difference between the first node and the second end of the driving circuit; the light emitting control circuit is under the control of the light emitting control signal end The signal of the first power terminal is supplied to the driving circuit; the driving circuit outputs the driving current.
- the driving method of the pixel circuit may enable the operating current of the driving transistor in the pixel circuit to drive the light emitting element to emit light only related to the data voltage and the reference voltage of the data signal end, and the threshold voltage of the driving transistor and the second
- the voltage at the power supply terminal is independent, and the influence of the threshold voltage of the driving transistor and the voltage drop on the current outputted by the driving transistor can be avoided, so that the current outputted by the driving transistor is kept stable, thereby improving the uniform brightness of the display screen of the display device including the pixel circuit. Sex.
- Embodiments of the present disclosure also provide a display panel including a plurality of pixel units distributed in an array, each pixel unit including any of the pixel circuits as provided by embodiments of the present disclosure.
- the principle of the problem of the display panel is similar to that of the foregoing pixel circuit. Therefore, the implementation of the display panel can be referred to the implementation of the pixel circuit described above, and the repeated description is omitted.
- the display panel may be an organic electroluminescence display panel.
- Embodiments of the present disclosure also provide a display device including a display panel provided by an embodiment of the present disclosure.
- the display device 1 includes: a plurality of pixel units 40 distributed in an array, a plurality of first control signal lines, a plurality of second control signal lines, a plurality of light emission control signal lines, and a plurality of pieces of data.
- Signal line It should be noted that only a part of the pixel unit 40, the first control signal line, the second control signal line, the light emission control signal line, and the data signal line are shown in FIG.
- S1 N represents the first control signal line of the Nth row
- S1 N+1 represents the first control signal line of the N+1th row
- S2 N represents the second control signal line of the Nth row
- S2 N+1 represents The second control signal line of the N+1th row
- E N represents the light emission control signal line of the Nth row
- E N+1 represents the light emission control signal line of the (N+1)th row
- D M represents the data signal line of the Mth column
- D M+1 represents the data signal line of the M+1th column.
- N and M are, for example, integers greater than zero.
- each of the pixel units 40 may include any of the pixel circuits 10 provided in the above embodiments, including, for example, the pixel circuits shown in FIG.
- the first control signal line of each row is connected to the first control signal end of the pixel circuit of the row; the second control signal line of each row is connected with the second control signal end of the pixel circuit of the row; the illumination of each row
- the control signal line is connected to the light emission control signal end of the pixel circuit of the row; the data signal line of each column is connected to the data signal end of the pixel circuit of the column.
- the display device 1 shown in FIG. 8 may further include a plurality of first power lines and a plurality of second power lines to respectively provide V DD and V SS (not shown).
- the display device 1 may further include a scan driving circuit 20 and a data driving circuit 30.
- the data driving circuit 30 may be connected to a plurality of data signal lines (D M , D M+1 , etc.) to provide a data voltage Vdata.
- the scan driving circuit 20 may be connected to a plurality of first control signal lines (S1 N , S1 N+1 , etc.), a plurality of second control signal lines (S2 N , S2 N+1 , etc.), and a plurality of light emission control signal lines. (E N , E N+1 , etc.) to provide a control signal.
- the scan driving circuit 20 and the data driving circuit 30 may be implemented as a semiconductor chip.
- the display device 1 may also include other components such as a timing controller, a signal decoding circuit, a voltage conversion circuit, etc., which may be, for example, conventional conventional components, and will not be described in detail herein.
- the display device 1 provided by the embodiment of the present disclosure may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
- a display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
- Other indispensable components of the display device are understood by those skilled in the art, and are not described herein, nor should they be construed as limiting the invention.
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- Control Of El Displays (AREA)
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Abstract
Description
Claims (16)
- 一种像素电路,包括:数据写入电路、补偿控制电路、存储电路、发光控制电路和驱动电路;其中,所述数据写入电路分别与第一控制信号端、数据信号端以及第一节点连接;所述数据写入电路用于在所述第一控制信号端的控制下将所述数据信号端的信号提供至所述第一节点;所述存储电路分别与所述第一节点、所述驱动电路的控制端以及所述驱动电路的第二端连接;所述存储电路用于保持所述第一节点与所述驱动电路的控制端之间的电压差,以及保持所述第一节点与所述驱动电路的第二端的电压差;所述补偿控制电路分别与第二控制信号端、所述驱动电路的控制端以及所述驱动电路的第一端连接;所述补偿控制电路用于在所述第二控制信号端的控制下使所述驱动电路的控制端与所述驱动电路的第一端导通;所述发光控制电路分别与发光控制信号端、第一电源端以及所述驱动电路的第一端连接;所述发光控制电路用于在所述发光控制信号端的控制下将所述第一电源端的信号提供至所述驱动电路;所述驱动电路分别与所述补偿控制电路、所述发光控制电路以及所述存储电路连接;所述驱动电路用于输出驱动电流。
- 如权利要求1所述的像素电路,其中,所述存储电路包括第一存储电路和第二存储电路,所述第一存储电路分别与所述第一节点以及所述驱动电路的控制端连接;所述第一存储电路用于保持所述第一节点与所述驱动电路的控制端之间的电压差;所述第二存储电路分别与所述第一节点以及所述驱动电路的第二端连接;所述第二存储电路用于保持所述第一节点与所述驱动电路的第二端的电压差。
- 如权利要求1所述的像素电路,还包括发光元件,其中,所述发光元件的第一极和所述驱动电路的第二端以及所述存储电路连接,所述发光元件的第二极和第二电源端连接;所述发光元件用于在所述驱动电路输出的驱动电流的作用下进行发光。
- 如权利要求1所述的像素电路,其中,所述驱动电路包括驱动晶体管,所述驱动晶体管的栅极作为所述驱动电路的控制端和所述存储电路以及所述补偿控制电路连接,所述驱动晶体管的第一极作为所述驱动电路的第一端和所述补偿控制电路以及所述发光控制电路连接,所述驱动晶体管的第二极作为所述驱动电路的第二端和所述存储电路连接。
- 如权利要求2所述的像素电路,其中,所述第一存储电路包括第一电容,所述第一电容的第一端与所述第一节点连接,所述第一电容的第二端与所述驱动电路的控制端连接。
- 如权利要求5所述的像素电路,其中,所述第二存储电路包括第二电容,所述第二电容的第一端与所述第一节点连接,所述第二电容的第二端与所述驱动电路的第二端连接。
- 如权利要求6所述的像素电路,其中,所述第一电容的电容值大于所述第二电容的电容值。
- 如权利要求1所述的像素电路,其中,所述数据写入电路包括第一开关晶体管,所述第一开关晶体管的栅极与所述第一控制信号端连接,所述第一开关晶体管的第一极与所述数据信号端连接,所述第一开关晶体管的第二极与所述第一节点连接。
- 如权利要求1所述的像素电路,其中,所述补偿控制电路包括第二开关晶体管,所述第二开关晶体管的栅极与所述第二控制信号端连接,所述第二开关晶体管的第一极与所述驱动电路的控制端连接,所述第二开关晶体管的第二极与所述驱动电路的第一端连接。
- 如权利要求1所述的像素电路,其中,所述发光控制电路包括第三开关晶体管,所述第三开关晶体管的栅极与所述发光控制信号端连接,所述第三开关晶体管的第一极与所述第一电源端连接,所述第三开关晶体管的第二极与所述驱动电路的第一端连接。
- 如权利要求4所述的像素电路,其中,所述驱动晶体管为N型晶体管。
- 如权利要求8-10任一项所述的像素电路,其中,所述开关晶体管为P型晶体管或N型晶体管。
- 一种显示面板,包括呈阵列分布的多个像素单元,其中,每个所述像素单元包括如权利1-12任一项所述的像素电路。
- 一种显示装置,包括如权利要求13所述的显示面板。
- 如权利要求14所述的显示装置,还包括:多条第一控制信号线、多条第二控制信号线、多条发光控制信号线和多条数据信号线;其中,每一行的所述第一控制信号线和本行像素电路中的所述第一控制信号端连接;每一行的所述第二控制信号线和本行像素电路中的所述第二控制信号端连接;每一行的所述发光控制信号线和本行像素电路中的所述发光控制信号端连接;每一列的数据信号线和本列像素电路中的所述数据信号端连接。
- 一种如权利要求1-12任一项所述的像素电路的驱动方法,包括:重置与补偿阶段、数据写入阶段和发光阶段;其中,在重置与补偿阶段,所述补偿控制电路在所述第二控制信号端的控制下将所述驱动电路的控制端与所述驱动电路的第一端导通;在数据写入阶段,所述数据写入电路在所述第一控制信号端的控制下将所述数据信号端的信号提供至所述第一节点;在发光阶段,所述存储电路保持所述第一节点与所述驱动电路的控制端之间的电压差,以及保持所述第一节点与所述驱动电路的第二端的电压差;所述发光控制电路在所述发光控制信号端的控制下将所述第一电源端的信号提供至所述驱动电路;所述驱动电路输出驱动电流。
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JP2018545204A JP7113750B2 (ja) | 2017-07-27 | 2018-02-23 | 画素回路及びその駆動方法、表示パネル、表示装置 |
EP18755388.8A EP3660825A4 (en) | 2017-07-27 | 2018-02-23 | PIXEL CIRCUIT AND RELATED CONTROL PROCESS, DISPLAY PANEL AND DISPLAY DEVICE |
KR1020187026426A KR20190025812A (ko) | 2017-07-27 | 2018-02-23 | 픽셀 회로 및 구동 방법, 디스플레이 패널, 디스플레이 디바이스 |
US16/078,840 US20210210013A1 (en) | 2017-07-27 | 2018-02-23 | Pixel circuit and driving method, display panel, display device |
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CN201710624591.3A CN109308875A (zh) | 2017-07-27 | 2017-07-27 | 一种像素电路、其驱动方法、显示面板及显示装置 |
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EP (1) | EP3660825A4 (zh) |
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CN113936586B (zh) * | 2019-08-30 | 2022-11-22 | 成都辰显光电有限公司 | 一种像素驱动电路和显示面板 |
CN111640397B (zh) * | 2020-05-29 | 2021-06-01 | 昆山国显光电有限公司 | 像素电路、显示面板及显示装置 |
US11322087B1 (en) * | 2021-04-22 | 2022-05-03 | Sharp Kabushiki Kaisha | Pixel circuit with threshold voltage compensation |
CN114999399B (zh) * | 2022-06-30 | 2023-05-26 | 惠科股份有限公司 | 像素驱动电路、显示面板及显示装置 |
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- 2018-02-23 US US16/078,840 patent/US20210210013A1/en not_active Abandoned
- 2018-02-23 WO PCT/CN2018/077011 patent/WO2019019622A1/zh active Application Filing
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CN109308875A (zh) | 2019-02-05 |
EP3660825A1 (en) | 2020-06-03 |
JP7113750B2 (ja) | 2022-08-05 |
EP3660825A4 (en) | 2021-03-17 |
US20210210013A1 (en) | 2021-07-08 |
KR20190025812A (ko) | 2019-03-12 |
JP2020528154A (ja) | 2020-09-17 |
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