WO2018219209A1 - 像素补偿电路及补偿方法、显示装置 - Google Patents
像素补偿电路及补偿方法、显示装置 Download PDFInfo
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- WO2018219209A1 WO2018219209A1 PCT/CN2018/088213 CN2018088213W WO2018219209A1 WO 2018219209 A1 WO2018219209 A1 WO 2018219209A1 CN 2018088213 W CN2018088213 W CN 2018088213W WO 2018219209 A1 WO2018219209 A1 WO 2018219209A1
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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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- 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]
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- 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
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- 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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- 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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- 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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- 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 disclosure relates to the field of display technologies, and in particular, to a pixel compensation circuit, a compensation method, and a display device.
- an OLED Organic Light Emitting Diode
- the OLED can be classified into a PMOLED (Passive Matrix Driving OLED) and an AMOLED (Active Matrix Driving OLED).
- the AMOLED display has the advantages of low manufacturing cost, high response speed, power saving, DC driving for portable devices, and a wide operating temperature range, and is expected to become a next-generation flat panel display replacing LCD (Liquid Crystal Display).
- AMOLED uses LTPS (Low Temperature Poly-silicon) technology to fabricate Thin Film Transistors (TFTs), so that a higher mobility K can be obtained, but there is also a drift of the threshold voltage Vth.
- TFTs Thin Film Transistors
- the corresponding pixel compensation structure is needed. So far, the structure of the AMOLED pixel compensation circuit is relatively complicated, and due to the limitation of the process level, the non-uniformity of parameters such as the threshold voltage Vth and the mobility K of the thin film transistor is easily caused.
- the voltage drop generated by the power supply signal VDD due to its own routing also causes a difference in the power supply voltage. Therefore, the structure of the pixel compensation circuit needs to be optimized to compensate for the voltage difference caused by the power supply signal VDD, thereby improving the OLED illumination. Uniformity of brightness.
- Embodiments of the present disclosure relate to a pixel compensation circuit and a compensation method, and a display device.
- a pixel compensation circuit including:
- control end is connected to the reset signal end, the first end is connected to the initialization signal end, and the second end is connected to the control end of the driving transistor;
- control end is connected to the scan signal end, the first end is connected to the data signal end, and the second end is connected to the first end of the driving transistor;
- control end is connected to the scan signal end, the first end is connected to the data signal end, the second end is connected to the first end of the coupling capacitor, and the second end of the coupling capacitor is connected to the first power signal end;
- control end is connected to the scan signal end, the first end and the second end are respectively connected to the control end and the second end of the driving transistor;
- control end is connected to the control signal end, the first end is connected to the first power signal end, and the second end is connected to the first end of the driving transistor;
- control end is connected to the control signal end, the first end is connected to the second end of the driving transistor, and the second end is connected to the first pole of the OLED light emitting element;
- a storage capacitor is connected between the data signal terminal and the control terminal of the drive transistor.
- the pixel compensation circuit further includes:
- control end is connected to the reset signal end, the first end is connected to the initialization signal end, and the second end is connected to the first pole of the OLED light emitting element.
- the second pole of the OLED light emitting element is connected to the second power signal terminal.
- all of the switching elements are P-type transistors or both are N-type transistors.
- the first power signal terminal provides a high level signal
- the second power signal terminal provides a low level signal
- the first power signal terminal provides a low level signal
- the second power signal terminal provides a high level signal
- a pixel compensation method for compensating an OLED pixel includes:
- the first switching element is turned on by the reset signal, and the initialization signal is transmitted to the control terminal of the driving transistor through the first switching element;
- the second switching element, the third switching element and the fourth switching element are turned on by using the scan signal, and the data signal is transmitted to the first end of the driving transistor through the second switching element, and passes through The third switching element is transmitted to the first end of the coupling capacitor, and the control end of the driving transistor is connected to the second end to write the compensation voltage of the driving transistor to the storage capacitor;
- the fifth switching element and the sixth switching element are turned on by the control signal, and the first power signal is transmitted to the first end of the driving transistor through the fifth switching element, and the driving transistor is in the storage capacitor
- the voltage signal is controlled to be turned on to output a driving current under the action of the first power signal and to flow through the sixth switching element to drive the OLED light emitting element to emit light.
- the pixel compensation method further includes:
- the seventh switching element is turned on by the reset signal, and the initialization signal is transmitted to the first pole of the OLED light emitting element through the seventh switching element.
- all of the switching elements are turned on at a low level or both are turned on at a high level.
- a display device including the above-described pixel compensation circuit is provided.
- FIG. 1 is a schematic block diagram showing a structure of a pixel compensation circuit in an exemplary embodiment of the present disclosure
- FIG. 2 is a view schematically showing an operation timing chart of a pixel compensation circuit in an exemplary embodiment of the present disclosure
- FIG. 3 is a view schematically showing an operation state diagram 1 of a pixel compensation circuit in an exemplary embodiment of the present disclosure
- FIG. 4 is a view schematically showing an operation state diagram 2 of a pixel compensation circuit in an exemplary embodiment of the present disclosure
- FIG. 5 schematically shows an operational state diagram 3 of the pixel compensation circuit in an exemplary embodiment of the present disclosure.
- the example embodiment provides a pixel compensation circuit for driving an OLED light emitting element to emit light.
- the pixel compensation circuit may include:
- a driving transistor DT having a control end, a first end and a second end for driving the OLED light emitting element to emit light;
- the first switching element T1 has a control terminal connected to the reset signal terminal, a first terminal connected to the initialization signal terminal, and a second terminal connected to the control terminal of the driving transistor DT for transmitting the initialization signal Vinit to the driving transistor DT in response to the reset signal Reset. Control terminal;
- the second switching element T2 has a control terminal connected to the scan signal end, a first end connected to the data signal end, and a second end connected to the first end of the driving transistor DT for transmitting the data signal Vdata to the driving transistor DT in response to the scan signal Gate First end;
- the third switching element T3 has a control terminal connected to the scan signal end, a first end connected to the data signal end, and a second end connected to the first end of the coupling capacitor Cc for transmitting the data signal Vdata to the coupling capacitor Cc in response to the scan signal Gate
- the first end of the coupling capacitor Cc receives the first power signal VDD;
- the fourth switching element T4 has a control terminal connected to the scan signal end, and the first end and the second end are respectively connected to the control end and the second end of the driving transistor DT for responding to the scan signal Gate to drive the control terminal of the transistor DT and the second Two ends connected;
- a fifth switching element T5 the control end is connected to the control signal end, the first end is connected to the first power signal end, and the second end is connected to the first end of the driving transistor DT for transmitting the first power signal VDD in response to the control signal EM To the first end of the driving transistor DT;
- the sixth switching element T6 has a control terminal connected to the control signal end, a first end connected to the second end of the driving transistor DT, and a second end connected to the first electrode of the OLED light emitting element for responding to the control signal EM to drive the transistor DT
- the output current is transmitted to the OLED light emitting element to drive the light, and the second pole of the OLED light emitting element is connected to the second power signal end;
- a storage capacitor Cs is connected between the first power signal terminal and the control terminal of the driving transistor DT for holding a voltage signal of the control terminal of the driving transistor DT.
- the control terminal of the driving transistor DT, the second terminal of the first switching element T1, and the first terminal of the fourth switching element T4 are both connected to the first node N1; the first end of the driving transistor DT, and the second switching element T2
- the second end, and the second end of the fifth switching element T5 are both connected to the second node N2; the second end of the driving transistor DT, the second end of the fourth switching element T4, and the first of the sixth switching element T6
- the terminals are both connected to the third node N3.
- the reset signal end provides a reset signal Reset
- the initialization signal end provides an initialization signal Vinit
- the scan signal end provides a scan signal Gate
- the data signal end provides a data signal Vdata
- the control signal end provides a control signal EM.
- the first power signal terminal provides a first power signal VDD
- the second power signal terminal provides a second power signal VSS.
- the pixel compensation circuit provided by the exemplary embodiment of the present disclosure adds a third switching element T3 and a coupling capacitance Cc between the data signal terminal and the first power signal terminal. In this way, the pixel compensation circuit controls the second switching element T2 to be turned on to impede the data signal Vdata to the first end of the driving transistor DT, and to the data signal Vdata and the threshold voltage Vth of the driving transistor DT.
- Vdata+Vth (ie, Vdata+Vth) is written to the control terminal of the driving transistor DT, thereby realizing compensation of the threshold voltage Vth of the driving transistor DT; on the other hand, controlling the third switching element T3 to be turned on to write the data signal Vdata to one end of the coupling capacitor Cc And compensating the voltage of the first power signal VDD of different pixels by the coupling of the capacitors, thereby improving the influence of the voltage drop of the first power signal VDD on the brightness of the light, and at the same time reducing the load of the data signal.
- the pixel compensation circuit may further include:
- the seventh switching element T7 has a control terminal connected to the reset signal end, a first end connected to the initialization signal end, and a second end connected to the first pole of the OLED light emitting element for transmitting the initialization signal Vinit to the OLED light emitting element in response to the reset signal Reset The first pole.
- the pixel compensation circuit reduces the voltage difference between the two electrodes (anode and cathode) of the OLED light-emitting element by using the initialization voltage in the initialization phase, thereby reducing the luminance of the OLED light-emitting element during low-gray display, thereby improving The pixel contrast.
- all of the switching elements may be P-type transistors, and the driving voltage of each transistor is a low level voltage; in this case, the first power signal VDD may be a high level signal, and the second power signal VSS It may be a low level signal, the first pole of the OLED light emitting element may be an anode, and the second pole of the OLED light emitting element may be a cathode.
- all of the switching elements may also be N-type transistors, and the driving voltage of each transistor is a high level voltage; in this case, the first power signal VDD may be a low level signal, and the second power signal VSS may be high.
- the level signal, the first pole of the OLED light emitting element may be a cathode, and the second pole of the OLED light emitting element may be an anode.
- the level signals of the respective signal terminals need corresponding adjustment changes.
- a person skilled in the art can easily obtain a pixel driving circuit using different types of transistors according to the technical solutions of the present disclosure. Therefore, the pixel compensation circuit to be protected by the present disclosure is not limited to the implementation provided by the specific embodiments of the present disclosure, and may further include compensation according to the pixel. Simple changes made by the circuit are not described here.
- the pixel compensation circuit of the present exemplary embodiment uses a single channel type transistor, which simplifies the process manufacturing difficulty and reduces the production cost.
- the pixel compensation circuit also has the following advantages when all P-type transistors are used: for example, strong noise suppression; for example, low level conduction, and low level in charge management is relatively easy to implement; for example, N type Thin film transistors are susceptible to ground bounce, while P-type thin film transistors are only affected by the drive voltage drop (IR Drop), and the effects of IR Drop are easier to eliminate; for example, P-type thin film transistors are simple to process
- the relative price is lower; for example, the stability of the P-type thin film transistor is better, and the like. Therefore, the use of P-type thin film transistors can not only reduce the complexity of the manufacturing process and production costs, but also help to improve product quality.
- the example embodiment also provides a pixel compensation method for driving an OLED light emitting element to emit light.
- the pixel compensation method may include:
- Initialization phase (stage t1): as shown in FIG. 2 and FIG. 3, the first switching element T1 and the seventh switching element T7 are turned on by the reset signal Reset, and the initialization signal Vinit is transmitted to the driving transistor DT through the first switching element T1.
- the control terminal is the first node N1, and is transmitted to the first pole of the OLED light emitting element via the seventh switching element T7;
- Data writing and compensation phase (stage t2): as shown in FIG. 2 and FIG. 4, the second switching element T2, the third switching element T3, and the fourth switching element T4 are turned on by the scan signal Gate, and the data signal Vdata passes through the
- the second switching element T2 is transmitted to the first terminal N2 of the driving transistor DT, and is transmitted to the first end of the coupling capacitor Cc via the third switching element T3, and the fourth switching element T4 can make the control terminal of the driving transistor DT
- the second end is connected to write the compensation voltage (Vdata+Vth) of the driving transistor DT to the storage capacitor Cs;
- Light-emitting phase (stage t3): as shown in FIG. 2 and FIG. 5, the fifth switching element T5 and the sixth switching element T6 are turned on by the control signal EM, and the first power signal VDD is transmitted to the driving transistor through the fifth switching element T5.
- the first terminal of the DT that is, the second node N2
- the driving transistor DT is turned on under the control of the voltage signal of the storage capacitor Cs, and outputs a driving current under the action of the first power signal VDD, and the driving current is transmitted through the sixth switching element T6.
- the on-voltage when all of the switching elements are P-type transistors, the on-voltage is low; or, when all of the switching elements are N-type transistors, the on-voltage is high.
- the pixel compensation method provided by the exemplary embodiment has the following beneficial effects:
- the initialization phase by applying the initialization signal Vinit to the first pole of the OLED light emitting element, the voltage difference between the two electrodes (anode and cathode) of the OLED light emitting element can be reduced, thereby reducing the OLED light emitting element in low gray scale display.
- Luminous brightness which in turn improves pixel contrast;
- the data writing and compensation phase (ie, the sampling phase)
- the data signal Vdata and the threshold voltage Vth of the driving transistor DT are written to the control terminal of the driving transistor DT.
- the data signal Vdata is compensated to improve the influence of the voltage drop of the first power supply signal VDD on the luminance of the light, while also reducing the load of the data signal Vdata.
- the pixel compensation circuit and the compensation method thereof in the present exemplary embodiment will be described in detail below with all the switching elements and the driving transistors being P-type thin film transistors as an example.
- the initialization signal Vinit is at a low level
- the reset signal Reset is at a low level
- the first switching element T1 and the seventh switching element T7 are turned on; the initialization signal Vinit is passed through the first switch.
- the element T1 initializes the first node N1, which is the control terminal of the driving transistor DT, and the voltage of the first node N1 is the initialization voltage and the initialization voltage is stored in the storage capacitor Cs.
- the driving transistor DT is turned on; the initialization signal Vinit is also Initializing the anode of the OLED light-emitting element, that is, the anode, by the seventh switching element T7, thereby reducing the voltage difference between the anode and the cathode of the OLED light-emitting element, thereby reducing the luminance of the OLED light-emitting element during low-gray display. In turn, the contrast of the pixels is increased.
- the scan signal Gate is at a low level, the second switching element T2, the third switching element T3, and the fourth switching element T4 are turned on; the data signal Vdata passes through the second switching element.
- T2 is transmitted to the first terminal N2 of the driving transistor DT, the driving transistor DT is kept in an on state by the voltage of the storage capacitor Cs, and the fourth switching element T4 will drive the control terminal and the second end of the transistor DT.
- the data signal Vdata and the threshold voltage Vth of the driving transistor DT are written to the control terminal of the driving transistor DT and stored in the storage capacitor Cs.
- the voltage of the first node N1 is Vdata+Vth, thereby completing the pair of driving transistors.
- the threshold voltage Vth of the DT is compensated; the data signal Vdata is also transmitted to the first end of the coupling capacitor Cc through the third switching element T3, and the first power signal VDD is compensated by the coupling action of the coupling capacitor Cc, thereby improving the first power source.
- the control signal EM is at a low level, the fifth switching element T5 and the sixth switching element T6 are turned on; the first power supply signal VDD is transmitted to the driving transistor through the fifth switching element T5.
- the first end of the DT is the second node N2.
- the data signal Vdata has already completed the voltage compensation of the first power signal VDD through the coupling of the coupling capacitor Cc; the driving transistor DT is driven and driven by the first power signal VDD.
- the current is passed to the third node N3 and transmitted to the OLED light emitting element through the sixth switching element T6 to drive it to emit light.
- the driving current of the OLED device is:
- the driving current of the OLED device is only related to the data signal Vdata and the first power signal VDD, that is, the influence of the threshold voltage Vth on the OLED driving current is eliminated, thereby avoiding the threshold voltage of the driving transistor DT of different pixels.
- the luminance of the light caused by the difference in Vth is uneven.
- the data signal Vdata also compensates for the IR drop of the first power signal VDD through the coupling action of the coupling capacitor Cc, thereby eliminating the influence of the voltage difference of the first power signal VDD on the uniformity of the luminance, and at the same time Reduce the load of the data signal Vdata.
- the example embodiment also provides a display device including the OLED pixel compensation circuit described above. Based on this, the uniformity of the luminance of each pixel in the display device is good, which is beneficial to improving the display effect of the OLED product.
- the display device may include any product or component having a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, and the like.
- modules or units of equipment for action execution are mentioned in the detailed description above, such division is not mandatory. Indeed, in accordance with embodiments of the present disclosure, the features and functions of two or more modules or units described above may be embodied in one module or unit. Conversely, the features and functions of one of the modules or units described above may be further divided into multiple modules or units.
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Abstract
Description
Claims (11)
- 一种像素补偿电路,包括:OLED发光元件;驱动晶体管,被配置为驱动OLED发光元件发光;第一开关子电路,被配置为响应复位信号将初始化信号传输至驱动晶体管的控制端;第二开关子电路,被配置为响应扫描信号将数据信号传输至驱动晶体管的第一端;第三开关子电路,被配置为响应扫描信号将数据信号传输至电容耦合子电路的第一端,电容耦合子电路的第二端接收第一电源信号;第四开关子电路,被配置为响应扫描信号将驱动晶体管的控制端和第二端连通;第五开关子电路,被配置为响应控制信号将第一电源信号传输至驱动晶体管的第一端;第六开关子电路,被配置为响应控制信号将驱动晶体管的输出电流传输至OLED发光元件而驱动其发光;存储子电路,被配置为保持驱动晶体管的控制端的电压信号。
- 根据权利要求1所述的像素补偿电路,其中,第一开关子电路包括第一开关元件,其控制端连接复位信号端、第一端连接初始化信号端、第二端连接所述驱动晶体管的控制端;第二开关子电路包括第二开关元件,其控制端连接扫描信号端、第一端连接数据信号端、第二端连接所述驱动晶体管的第一端;第三开关子电路包括第三开关元件并且电容耦合子电路包括耦合电容,第三开关元件的控制端连接所述扫描信号端、第一端连接所述数据信号端、第二端连接耦合电容的第一端,所述耦合电容的第二端连接第一电源信号端;第四开关子电路包括第四开关元件,其控制端连接所述扫描信号端、第一端和第二端分别连接所述驱动晶体管的控制端和第二端;第五开关子电路包括第五开关元件,其控制端连接控制信号端、第一端连接所述第一电源信号端、第二端连接所述驱动晶体管的第一端;第六开关子电路包括第六开关元件,其控制端连接控制信号端、第一端连接所述驱动晶体管的第二端、第二端连接所述OLED发光元件的第一极;存储子电路包括存储电容,其连接在所述第一电源信号端和所述驱动晶体管的控制端之间。
- 根据权利要求2所述的像素补偿电路,还包括:第七开关元件,控制端连接所述复位信号端、第一端连接所述初始化信号端、第二端连接所述OLED发光元件的第一极。
- 根据权利要求2或3所述的像素补偿电路,其中,所述OLED发光元件的第二极连 接第二电源信号端。
- 根据权利要求2-4任一项所述的像素补偿电路,其中,所有开关元件均为P型晶体管或者均为N型晶体管。
- 根据权利要求4所述的像素补偿电路,其中,所述第一电源信号端提供高电平信号,所述第二电源信号端提供低电平信号。
- 根据权利要求4所述的像素补偿电路,其中,所述第一电源信号端提供低电平信号,所述第二电源信号端提供高平信号。
- 一种像素补偿方法,用于对OLED像素进行补偿,所述像素补偿方法包括:在初始化阶段,利用复位信号导通第一开关子电路,初始化信号经过所述第一开关子电路传输至驱动晶体管的控制端;在数据写入及补偿阶段,利用扫描信号导通第二开关子电路、第三开关子电路和第四开关子电路,数据信号经过所述第二开关子电路传输至所述驱动晶体管的第一端、并经过所述第三开关子电路传输至电容耦合子电路的第一端,所述电容耦合子电路的第二端连接第一电源信号,数据信号通过电容耦合子电路的耦合作用对第一电源信号的电压进行补偿,所述驱动晶体管的控制端和第二端连通以将所述驱动晶体管的补偿电压写入存储子电路;在发光阶段,利用控制信号导通第五开关子电路和第六开关子电路,第一电源信号经过所述第五开关子电路传输至所述驱动晶体管的第一端,所述驱动晶体管在所述存储子电路的电压信号控制下导通以在所述第一电源信号的作用下输出驱动电流、并流经所述第六开关子电路以驱动所述OLED发光元件进行发光。
- 根据权利要求8所述的像素补偿方法,还包括:在所述初始化阶段,利用所述复位信号导通第七开关子电路,所述初始化信号经过所述第七开关子电路传输至所述OLED发光元件的第一极。
- 根据权利要求8或9所述的像素补偿方法,其中,所有开关子电路均为低电平导通或者均为高电平导通。
- 一种显示装置,包括权利要求1-7任一项所述的像素补偿电路。
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110136650A (zh) * | 2019-05-29 | 2019-08-16 | 京东方科技集团股份有限公司 | 像素电路、其驱动方法、阵列基板及显示装置 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106991968B (zh) * | 2017-05-27 | 2020-11-27 | 京东方科技集团股份有限公司 | 像素补偿电路及补偿方法、显示装置 |
CN107767819A (zh) * | 2017-09-28 | 2018-03-06 | 京东方科技集团股份有限公司 | 像素驱动电路及方法、显示装置 |
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CN115035855B (zh) * | 2022-06-24 | 2023-06-23 | 惠科股份有限公司 | 电压补偿电路、电压补偿驱动方法及显示装置 |
CN115171590A (zh) * | 2022-07-28 | 2022-10-11 | 惠科股份有限公司 | 像素驱动电路和显示面板 |
CN115440163B (zh) * | 2022-11-09 | 2023-01-03 | 惠科股份有限公司 | 像素驱动电路、像素驱动方法及显示装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102903333A (zh) * | 2012-10-25 | 2013-01-30 | 昆山工研院新型平板显示技术中心有限公司 | 有机发光显示器的像素电路 |
CN103199096A (zh) * | 2013-04-18 | 2013-07-10 | 上海和辉光电有限公司 | 薄膜晶体管阵列基板及其制造方法 |
US20140078191A1 (en) * | 2012-09-17 | 2014-03-20 | Innolux Corporation | Display device and light adjusting method thereof |
CN104778922A (zh) * | 2015-04-28 | 2015-07-15 | 陕西科技大学 | 一种amoled像素驱动电路及其驱动方法 |
CN105869573A (zh) * | 2015-02-05 | 2016-08-17 | 三星显示有限公司 | 有机发光二极管显示器 |
US9659525B2 (en) * | 2014-07-08 | 2017-05-23 | Samsung Display Co., Ltd. | Display device |
CN106991968A (zh) * | 2017-05-27 | 2017-07-28 | 京东方科技集团股份有限公司 | 像素补偿电路及补偿方法、显示装置 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100698681B1 (ko) * | 2004-06-29 | 2007-03-23 | 삼성에스디아이 주식회사 | 발광 표시장치 |
KR100833753B1 (ko) * | 2006-12-21 | 2008-05-30 | 삼성에스디아이 주식회사 | 유기 전계 발광 표시 장치 및 그 구동방법 |
US7911459B2 (en) * | 2007-03-28 | 2011-03-22 | Himax Technologies Limited | Pixel circuit |
KR20100006106A (ko) * | 2008-07-08 | 2010-01-18 | 삼성모바일디스플레이주식회사 | 화소 및 이를 이용한 유기전계발광 표시장치 |
CN100578593C (zh) | 2008-08-11 | 2010-01-06 | 上海广电光电子有限公司 | 主动式有机发光器件的像素电路 |
KR101058114B1 (ko) * | 2009-11-16 | 2011-08-24 | 삼성모바일디스플레이주식회사 | 화소 회로, 유기 전계 발광 표시 장치 |
JP2013061390A (ja) * | 2011-09-12 | 2013-04-04 | Canon Inc | 表示装置 |
KR101997792B1 (ko) * | 2011-11-18 | 2019-07-09 | 삼성디스플레이 주식회사 | 화소, 이를 이용한 표시 장치 및 그 구동 방법 |
CN103310728B (zh) | 2013-05-29 | 2015-05-20 | 京东方科技集团股份有限公司 | 发光二极管像素单元电路和显示面板 |
CN104751777B (zh) * | 2013-12-31 | 2017-10-17 | 昆山工研院新型平板显示技术中心有限公司 | 像素电路、像素及包括该像素的amoled显示装置及其驱动方法 |
KR20150138527A (ko) * | 2014-05-29 | 2015-12-10 | 삼성디스플레이 주식회사 | 화소 회로 및 이를 포함하는 전계발광 디스플레이 장치 |
CN104078007A (zh) * | 2014-07-01 | 2014-10-01 | 何东阳 | 一种主动发光显示器件像素电路 |
KR102206602B1 (ko) * | 2014-07-14 | 2021-01-25 | 삼성디스플레이 주식회사 | 화소 및 이를 이용한 유기전계발광 표시장치 |
CN104157240A (zh) * | 2014-07-22 | 2014-11-19 | 京东方科技集团股份有限公司 | 像素驱动电路、驱动方法、阵列基板及显示装置 |
CN104200779B (zh) | 2014-09-25 | 2016-09-07 | 上海天马有机发光显示技术有限公司 | 像素电路及其驱动方法、显示面板、显示装置 |
CN104464616B (zh) | 2014-10-28 | 2017-10-03 | 上海天马有机发光显示技术有限公司 | 像素电路及其驱动方法、显示面板 |
CN105761664B (zh) | 2014-12-16 | 2018-06-29 | 昆山工研院新型平板显示技术中心有限公司 | 像素电路及其驱动方法和有源矩阵有机发光显示器 |
CN105185305A (zh) * | 2015-09-10 | 2015-12-23 | 京东方科技集团股份有限公司 | 一种像素电路、其驱动方法及相关装置 |
CN106683619A (zh) * | 2017-03-28 | 2017-05-17 | 京东方科技集团股份有限公司 | 像素驱动电路、像素驱动方法和显示装置 |
-
2017
- 2017-05-27 CN CN201710392528.1A patent/CN106991968B/zh active Active
-
2018
- 2018-05-24 WO PCT/CN2018/088213 patent/WO2018219209A1/zh active Application Filing
- 2018-05-24 US US16/336,957 patent/US10916188B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140078191A1 (en) * | 2012-09-17 | 2014-03-20 | Innolux Corporation | Display device and light adjusting method thereof |
CN102903333A (zh) * | 2012-10-25 | 2013-01-30 | 昆山工研院新型平板显示技术中心有限公司 | 有机发光显示器的像素电路 |
CN103199096A (zh) * | 2013-04-18 | 2013-07-10 | 上海和辉光电有限公司 | 薄膜晶体管阵列基板及其制造方法 |
US9659525B2 (en) * | 2014-07-08 | 2017-05-23 | Samsung Display Co., Ltd. | Display device |
CN105869573A (zh) * | 2015-02-05 | 2016-08-17 | 三星显示有限公司 | 有机发光二极管显示器 |
CN104778922A (zh) * | 2015-04-28 | 2015-07-15 | 陕西科技大学 | 一种amoled像素驱动电路及其驱动方法 |
CN106991968A (zh) * | 2017-05-27 | 2017-07-28 | 京东方科技集团股份有限公司 | 像素补偿电路及补偿方法、显示装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110136650A (zh) * | 2019-05-29 | 2019-08-16 | 京东方科技集团股份有限公司 | 像素电路、其驱动方法、阵列基板及显示装置 |
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