WO2019095491A1 - Oled驱动补偿电路及amoled显示面板 - Google Patents

Oled驱动补偿电路及amoled显示面板 Download PDF

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Publication number
WO2019095491A1
WO2019095491A1 PCT/CN2017/116923 CN2017116923W WO2019095491A1 WO 2019095491 A1 WO2019095491 A1 WO 2019095491A1 CN 2017116923 W CN2017116923 W CN 2017116923W WO 2019095491 A1 WO2019095491 A1 WO 2019095491A1
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Prior art keywords
film transistor
thin film
compensation
voltage
receives
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French (fr)
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颜伟男
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US15/746,707 priority Critical patent/US10825386B2/en
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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]
    • 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
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • 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
    • 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
    • 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
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • the present invention relates to the field of display driving technologies, and in particular, to an OLED driving compensation circuit and an AMOLED display panel.
  • Organic Light-Emitting Diode (OLED) display panels are favored by people because of their thinness, energy saving, wide viewing angle, wide color gamut and high contrast.
  • Organic light-emitting diode display panels are classified into passive organic light-emitting diodes.
  • AMOLED display panels still have significant drawbacks. For example, due to uneven panel fabrication, the threshold voltages of the respective driving thin film transistors are different, resulting in display differences between pixels. In the prior art, although the effect of the threshold voltage is solved by some compensation techniques, the cost is complicated by the compensation circuit. The rate is reduced; in addition, due to the impedance of the panel's own wiring, the panel display brightness is reduced and the load current is increased. These problems still exist in products circulating in the existing market. It can be seen that the display stability of AMOLED display panels is one of the important topics in the industry, and there is still a long way to go to improve this technology.
  • the technical problem to be solved by the embodiments of the present invention is to provide an OLED driving compensation circuit and an AMOLED display panel.
  • the problem of poor display stability of the AMOLED display panel can be improved.
  • the first aspect of the present invention provides an OLED driving compensation circuit, including an OLED, a storage capacitor, a driving thin film transistor, a switching thin film transistor, a light emitting thin film transistor, and an initial thin film transistor; wherein the storage capacitor
  • the first electrode receives the power supply voltage
  • the second electrode is electrically connected to the gate of the driving thin film transistor, the first end of the initial thin film transistor receives the reference voltage, the second end thereof is electrically connected to the first end of the switching thin film transistor, and the gate thereof receives the first switching signal
  • a second end of the switching thin film transistor is electrically connected to a gate of the driving thin film transistor, a gate of the switching thin film transistor receives a scan signal, a first end of the driving thin film transistor receives a power supply voltage, and a second end of the driving thin film transistor is electrically Connected to the first end of the light emitting thin film transistor, the gate of the light emitting thin film transistor receives an enable signal, the second end of which is electrically connected to
  • one period of the OLED driving compensation circuit includes a reset period, a compensation period, and a lighting period, wherein
  • the initial thin film transistor and the switching thin film transistor are turned on, and the reference voltage is delivered to the second electrode of the storage capacitor via the initial thin film transistor and the switching thin film transistor;
  • the initial thin film transistor is turned off, the switching thin film transistor continues to be turned on, the compensation circuit receives the feedback current, and generates a compensation voltage according to the feedback current, and the compensation voltage is output to the storage via the switching thin film transistor.
  • a second electrode of the capacitor
  • the switching thin film transistor is turned off, the light emitting thin film transistor is turned on, and the OLED emits light.
  • the compensation circuit includes a voltage conversion unit, a comparison control unit and a compensation voltage generation unit, and the voltage conversion unit receives the feedback current and converts it into a corresponding feedback voltage according to the feedback current, and the comparison control unit respectively receives the feedback voltage and the ideal
  • the gray scale voltage outputs a control signal according to a comparison result of the feedback voltage and the ideal gray scale voltage, and the compensation voltage generating unit receives the control signal and generates a second electrode that is output to the storage capacitor via the switching thin film transistor.
  • the compensation voltage generating unit includes a first compensation thin film transistor, a second compensation thin film transistor, and a third compensation thin film transistor, and the control signal includes a second switching signal and a third switching signal, and the first compensation thin film transistor
  • the gate receives the second switching signal, the first end thereof receives a high level compensation voltage, the second end thereof is electrically connected to the first end of the third compensation thin film transistor, and the first end of the second compensation thin film transistor is electrically Connected to the first end of the third compensation thin film transistor, the gate receiving portion a second switching signal, the second end of which receives a low level compensation voltage, the second end of the third compensation thin film transistor is electrically connected to the first end of the switching thin film transistor, and the gate of the third compensation thin film transistor receives the third a switching signal, wherein, at the same time, one of the first compensation thin film transistor and the second compensation thin film transistor is turned on, and the third switching signal outputs a compensation voltage to the storage capacitor by controlling on or off control of the third compensation thin film transistor The second
  • the reference voltage is a low level voltage
  • the compensation voltage generating unit includes a fourth compensation thin film transistor, the first end of the fourth compensation thin film transistor receives a high level compensation voltage, and the second end thereof is electrically connected to The first end of the switching thin film transistor has a gate receiving a control signal.
  • the compensation circuit further comprises a signal source for outputting an ideal gray scale voltage.
  • the signal source is used to output n-level ideal gray scale voltage, wherein n is an integer greater than or equal to 2, the signal source includes n-1 resistors, and the n-1 resistors are used to output n-1
  • the ideal gray scale voltage, the ratio of the resistance of the n-1 resistors is:
  • ⁇ is a predetermined gamma value.
  • n 2 M , wherein M is a positive integer.
  • the OLED drive compensation circuit further includes a sustain capacitor for maintaining a voltage on the second electrode of the storage capacitor, the first electrode of the sustain capacitor being electrically connected to the first end of the switching thin film transistor, and the second electrode of the second electrode Ground.
  • a second aspect of the present invention provides an AMOLED display panel including the above OLED drive compensation circuit.
  • the OLED drive compensation circuit further includes a compensation circuit that receives the feedback current flowing through the second end of the driving thin film transistor and generates a compensation voltage according to the feedback current, and the compensation voltage is output to the storage capacitor via the switching thin film transistor. Therefore, the compensation voltage can compensate the voltage on the second electrode of the storage capacitor, that is, the voltage at the gate of the driving thin film transistor is compensated, so that the driving current flowing through the OLED can reach a desired size, and the OLED can reach the desired level.
  • the required brightness and gray scale so that the influence of the threshold voltage, the impedance of the panel trace, and the like on the driving current can be overcome, thereby The display stability of the AMOLED display panel is good.
  • FIG. 1 is a schematic diagram of an OLED drive compensation circuit according to a first embodiment of the present invention
  • FIG. 2 is a timing chart of an OLED drive compensation circuit according to a first embodiment of the present invention
  • FIG. 3 is a timing diagram of an OLED drive compensation circuit according to another embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing a series connection of resistors in a gamma circuit in a signal source according to a first embodiment of the present invention
  • FIG. 5 is a schematic diagram of an OLED drive compensation circuit according to a second embodiment of the present invention.
  • Fig. 6 is a timing chart of the OLED drive compensation circuit of the second embodiment of the present invention.
  • an embodiment of the present invention provides an OLED driving compensation circuit.
  • an OLED driving compensation circuit includes an OLED, a storage capacitor C1, a driving thin film transistor T1, and a switching thin film transistor T2.
  • the OLED is used for illumination to provide brightness for viewing by a user.
  • the first electrode of the storage capacitor C1 receives the power supply voltage OVDD.
  • the power supply voltage OVDD is a high-level power supply voltage
  • the second electrode of the storage capacitor C1 is electrically connected to the gate of the driving thin film transistor T1; the initial film
  • the first end of the transistor T6 receives a reference voltage Vref for initializing the storage capacitor C1, discharging or charging the storage capacitor C1 such that the voltage of the second electrode is the reference voltage Vref, the initial thin film transistor T6
  • the second end is electrically connected to the first end of the switching thin film transistor T2, the gate of the initial thin film transistor T6 receives the first switching signal SW1; the second end of the switching thin film transistor T2 is electrically connected to the driving thin film transistor T1 a second electrode of the gate and the storage capacitor C1, the gate of the switching thin film transistor T2 receives the scan signal Scan; the first end of the driving thin film transistor T1 receives the
  • the anode of the OLED is loaded with a low level voltage OVSS, which is a low level supply voltage or ground.
  • OVSS low level supply voltage or ground.
  • the first end of the driving thin film transistor T1, the switching thin film transistor T2, the light emitting thin film transistor T4, and the initial thin film transistor T6 is a source, and the second end is a drain.
  • the first end of the driving thin film transistor, the switching thin film transistor, the light emitting thin film transistor, and the initial thin film transistor is a drain, and the second end is a source.
  • the driving thin film transistor T1, the switching thin film transistor T2, the light emitting thin film transistor T4, and the initial thin film transistor T6 are N-type thin film transistors.
  • the driving thin film transistor, the switching thin film transistor, the light emitting thin film transistor, and the initial thin film transistor are P-type thin film transistors, and the timing signals mentioned later are changed accordingly.
  • the driving thin film transistor, the switching thin film transistor, the light emitting thin film transistor, and the initial thin film transistor need not be the same type of thin film transistor.
  • the OLED driving compensation circuit further includes a compensation circuit 100, and the compensation circuit 100 receives the feedback current I FB flowing through the second end of the driving thin film transistor T1.
  • the feedback current I FB is followed by
  • the driving current of the OLED is linear, and preferably, by adjusting the compensation circuit 110, the feedback current I FB is equal to the driving current of the OLED mentioned later.
  • the compensation circuit 100 generates a compensation voltage according to the feedback current I FB , and the compensation voltage is output to the storage capacitor C1 via the switching thin film transistor T2 .
  • the compensation circuit 100 compensating the output voltage to the high level storage capacitor C1, so that the voltage on the storage capacitor C1 increases, the feedback current I FB is gradually increased until a feedback current I FB compensation to achieve the desired current, high electrical stopped at this point
  • the flat compensation voltage is output to the storage capacitor C1.
  • the voltage at the second electrode of the storage capacitor C1 reaches a desired voltage, thereby driving the voltage Vg of the gate of the thin film transistor T1 to a desired voltage, and then the OLED emits light when it flows.
  • the driving current of the OLED reaches the desired driving current, so that the luminescence of the OLED reaches the desired brightness, that is, the desired gray level is reached; otherwise, the compensation voltage of the low level is output to the storage capacitor C1, and the storage capacitor C1 is discharged. .
  • the purpose is to make the driving current of the OLED reach the desired driving current, and finally the OLED emits light to the desired brightness and gray scale, thereby improving the externality as much as possible.
  • the influence of the factors on the driving current of the OLED, so that the luminescence of the OLED is stable.
  • the timing of the OLED driving compensation circuit is periodic, and one cycle of the OLED driving compensation circuit includes a reset period, a compensation period, and a lighting period.
  • the scan signal Scan and the first switch signal SW1 are at a high level, and the initial thin film transistor T6 and the switching thin film transistor T2 are turned on, whereby the reference voltage Vref is initially
  • the thin film transistor T6 and the switching thin film transistor T2 are supplied to the second electrode of the storage capacitor C1 to initialize the voltage on the storage capacitor C1. In this embodiment, the storage capacitor C1 is charged.
  • the scan signal Scan continues to be at a high level, and the switching thin film transistor T2 continues to be turned on.
  • the first switching signal SW1 is at a low level, and the initial thin film transistor T6 is turned off.
  • the driving thin film transistor T1 and the compensation circuit 100 form a loop, and the compensation circuit 100 receives the feedback current I FB , and the feedback current I FB may be 0 amps or more than 0 amps.
  • the compensation circuit 100 is based on the feedback current I.
  • the FB generates a compensation voltage which is output to the second electrode of the storage capacitor C1 and the gate of the driving thin film transistor T1 via the switching thin film transistor T2, so that the feedback current I FB is correspondingly increased or decreased.
  • the voltage at the first electrode of the storage capacitor C1 is reduced, thereby driving the voltage Vg at the gate of the thin film transistor T1 to be reduced, thereby driving the thin film transistor.
  • the voltage between the T1 gate and the first terminal is reduced, so that the feedback current I FB and the drive current during the illumination period are reduced, so that the luminance of the OLED is reduced during the illumination phase, and the desired luminance can be achieved.
  • FIG. 1 in other embodiments of the present invention, referring to FIG.
  • the voltage at the first electrode of the storage capacitor C1 is increased, so that the voltage Vg at the gate of the driving thin film transistor T1 is increased.
  • the voltage between the gate and the first terminal of the driving thin film transistor T1 is increased, so that the feedback current I FB and the driving current during the light emitting period are increased, so that the luminance of the OLED is increased in the light emitting phase, and the desired luminance can be achieved. .
  • the enable signal EM is at a high level
  • the illuminating thin film transistor T4 is turned on
  • the driving thin film transistor T1 the illuminating thin film transistor T4, and the OLED form a conducting loop
  • the OLED is upstream.
  • Overdrive current the OLED will emit light.
  • the driving current flowing through the OLED reaches a desired size, so that the desired brightness and gray level are achieved on the OLED, thereby overcoming the threshold voltage, the impedance of the panel trace, and the like.
  • the effect on the drive current is that the voltage at the second electrode of the storage capacitor C1 is the voltage corresponding to the desired drive current.
  • the OLED driving compensation circuit further includes a feedback thin film transistor T3.
  • the first end of the feedback thin film transistor T3 is electrically connected to the second end of the driving thin film transistor T1, and the second end of the feedback thin film transistor T3 is electrically connected.
  • the gate of the feedback thin film transistor T3 receives the scan signal Scan. According to the timing of FIG. 2, the feedback thin film transistor T3 is turned on during the reset period and the compensation period, and is turned off during the light emission period.
  • the compensation circuit 100 includes a voltage conversion unit 110 , a comparison control unit 120 , and a compensation voltage generation unit 130 .
  • the voltage conversion unit 110 receives the feedback current I FB , specifically, the voltage conversion unit 110 is electrically connected to the second end of the feedback thin film transistor T3 .
  • the voltage conversion unit 110 converts the feedback current I FB corresponding to the feedback voltage V FB, where the feedback voltage V FB proportional to the FB and the feedback current I, and, in the present embodiment, the conditions for this feedback voltage V FB
  • the illuminating time period OLED driving current corresponding to the current gray level voltage Ugray that is, under the condition that the second electrode of the storage capacitor C1 is not compensated, the OLED flows through the driving current during the lighting period, and the OLED emits light, and the brightness of the OLED is emitted.
  • the corresponding current gray scale voltage Ugray is equal to the feedback voltage V FB .
  • the relationship between the current gray scale voltage Ugray, the feedback current I FB , and the feedback voltage V FB corresponding to the brightness emitted by the OLED when the voltage of the second electrode of the storage capacitor C1 is not compensated is as follows:
  • ⁇ is the conversion coefficient and the conversion coefficient is adjustable.
  • the comparison control unit 120 receives the feedback voltage V FB and the ideal gray scale voltage Vgray, respectively, where the ideal gray scale voltage Vgray is the voltage corresponding to the gray scale to be displayed, that is, the initial data.
  • the voltage, the ideal gray scale voltage Vgray corresponds to the gray scale and brightness that you want to display.
  • the comparison control unit 120 outputs a control signal to the compensation voltage generating unit 130 according to the comparison result.
  • the control signal includes a second switching signal SW2 and a third switching signal SW3, and the compensation voltage includes a high level compensation voltage V high and a low level compensation voltage V low .
  • the compensation voltage generating unit 130 receives the control signal and generates a compensation voltage, and the compensation voltage is output to the second electrode of the storage capacitor C1 via the switching thin film transistor T2 to perform the second electrode of the storage capacitor C1. Charge or discharge.
  • the compensation voltage generating unit 130 includes a first compensation thin film transistor T7, a second compensation thin film transistor T8, and a third compensation thin film transistor T5, and the gate of the first compensation thin film transistor T7 receives the second switching signal SW2.
  • the first end of the first compensation thin film transistor T7 receives the high level compensation voltage V high
  • the second end of the first compensation thin film transistor T7 is electrically connected to the first end of the third compensation thin film transistor T5, and the second compensation film
  • the gate of the transistor T8 receives the second switching signal SW2
  • the first end of the second compensation thin film transistor T8 is electrically connected to the first end of the third compensation thin film transistor T5, and the second end of the second compensation thin film transistor T8 receives the low level.
  • compensation voltage V low second end of the third compensation film transistor T5 is connected to a first end of the switching thin film transistor T2, the third gate receiving the compensation thin film transistor T5, the third switch SW3 are signal.
  • the first compensation thin film transistor T7 is a P-type thin film transistor.
  • the second compensation thin film transistor T8 is an N-type thin film transistor.
  • the first compensation thin film transistor is an N-type thin film transistor
  • the second compensation thin film transistor is a P-type thin film transistor.
  • the third compensation thin film transistor T5 is an N-type thin film transistor. In other embodiments of the invention, the third compensation thin film transistor is a P-type thin film transistor.
  • the third switching signal SW3 is at a high level, so that the third compensation thin film transistor T5 is turned on, and the second switching signal SW2 is a low level signal or a high level according to the result of the comparison control unit 120.
  • the result of the comparison control unit 120 is that the feedback voltage V FB is smaller than the ideal gray scale voltage Vgray
  • the second switching signal SW2 is at a low level, so that the first compensation thin film transistor T7 is turned on, and the second compensation film is turned on.
  • the transistor T8 is turned off, and the high-level compensation voltage V high reaches the second electrode of the storage capacitor C1 via the first compensation thin film transistor T7, the third compensation thin film transistor T5, and the switching thin film transistor T2, thereby charging the storage capacitor C1, and the feedback current I FB
  • the second switching signal SW2 is at a high level, so that the first compensation thin film transistor T7 is turned off, and the second compensation thin film transistor T8 is turned off.
  • the low-level compensation voltage V low reaches the second electrode of the storage capacitor C1 via the second compensation thin film transistor T8, the third compensation thin film transistor T5, and the switching thin film transistor T2, so that the second electrode of the storage capacitor C1 is discharged.
  • the feedback current I FB gradually decreases.
  • the feedback voltage V FB also gradually rises or falls, so that when the feedback voltage V FB is equal to the ideal gray scale voltage Vgray, at this time, the comparison control unit 120 controls the third switch The signal SW3 is at a low level.
  • the third compensation thin film transistor T5 is turned off, so that the high level compensation voltage V high or the low level compensation voltage V low stops outputting to the second electrode of the storage capacitor C1, and the storage capacitor C1 is
  • the second electrode is maintained at the current voltage, that is, the gate of the driving thin film transistor T1 is maintained at the current voltage, so that the driving current flowing on the OLED is a desired size during the lighting period, so that the light emitted by the OLED reaches the desired level.
  • the compensation circuit 100 further includes a signal source 140 for outputting an ideal gray scale voltage Vgray.
  • the signal source 140 is configured to output an n-th ideal gray scale voltage Vgray, where n is an integer greater than or equal to 2, for example, n is 2, 4, 8, 16, 32, 64, 128, 256, etc., at the same time, the signal source outputs only one level of the ideal gray scale voltage Vgray.
  • the n satisfies 2 M , where M is a positive integer, and in the embodiment, the n is 256.
  • the signal source 140 receives the digital signal and outputs a corresponding ideal gray scale voltage Vgray according to the received digital signal source 140.
  • the OLED can output n-level gray scale, that is, the OLED can emit n-level brightness.
  • the signal source 140 includes a gamma circuit.
  • the gamma circuit includes n+1 resistors, which are a resistor Ra, a resistor R1, a resistor R2, a resistor R3, ..., and a resistor.
  • the 1-55-level ideal gray-scale voltage Vgray satisfies the gama curve formula with an index of ⁇ , namely:
  • V grax-x is the xth-order ideal gray scale voltage, 1 ⁇ x ⁇ 255, ⁇ is a predetermined gamma value, and ⁇ is generally 2.2 in the present embodiment.
  • ⁇ is actually Need to set.
  • the difference between the adjacent two levels of the ideal gray scale voltage Vgray is as follows:
  • the gamma circuit of the embodiment since R1: R1: R3, ..., R255 satisfy the above formula, the gamma circuit of the embodiment only needs to include n+1 resistors, and the gamma circuit is less than the prior art. Thousands of small resistors with the same resistance value in series, and thousands of small resistors with the same resistance value. In this embodiment, the output of the n-level ideal gray-scale voltage Vgray can be realized, and the resistance of the gamma circuit included in the signal source 140 is included. The number is greatly reduced, greatly simplifying the gamma circuit and signal source 140.
  • the OLED drive compensation circuit further includes a sustain capacitor C2, and the first electrode of the sustain capacitor C2 is electrically connected to the switching thin film transistor.
  • the first end of T2, that is, the first electrode of the sustain capacitor C2 is also electrically connected to the second end of the initial thin film transistor T6, and the second electrode of the sustain capacitor C2 is electrically grounded.
  • the reference voltage Vref simultaneously initializes the first electrode of the storage capacitor C1 and the first electrode of the sustain capacitor C2.
  • the first electrode of the storage capacitor C1 and the first electrode of the sustain capacitor C2 The potential is the reference voltage Vref.
  • the compensation voltage simultaneously compensates the first electrode of the storage capacitor C1 and the first electrode of the sustain capacitor C2.
  • the compensation voltage stops the first to the storage capacitor C1.
  • the electrode and the first electrode of the sustaining capacitor C2 are compensated.
  • the switching thin film transistor T2 is still turned on, and since the sustaining capacitor C2 is provided, the storage capacitor C1 can be prevented from rapidly decreasing in voltage at the second electrode due to leakage.
  • An embodiment of the present invention further provides an AMOLED display panel, where the AMOLED display panel includes the OLED driving compensation circuit described above.
  • FIG. 5 is a schematic diagram of an OLED drive compensation circuit according to a second embodiment of the present invention.
  • the circuit of FIG. 5 is similar to the circuit of FIG. 1, and thus the same component symbols represent the same components.
  • the main difference between this embodiment and the first embodiment is the compensation voltage generating unit.
  • the compensation voltage generating unit 230 does not generate two kinds of compensation voltages, and only generates one type of compensation voltage.
  • the high-level compensation voltage V high is generated.
  • the compensation voltage generating unit 230 includes a fourth compensation thin film transistor T9.
  • the first end of the fourth compensation thin film transistor T9 receives the high level compensation voltage Vhigh
  • the second end of the fourth compensation thin film transistor T9 is electrically connected.
  • the gate of the fourth compensation thin film transistor T9 receives the control signal SW.
  • the fourth compensation thin film transistor T9 is a P-type thin film transistor, and the first end of the fourth compensation thin film transistor T9 is a source stage, and the second end is a drain level. Further, in other real-time examples of the present invention, the fourth compensation thin film transistor is an N-type thin film transistor. In addition, in other real-time examples of the present invention, the first end of the fourth compensation thin film transistor is a drain level, and the second end is a source stage.
  • the reference voltage V ini received by the first terminal of the initial thin film transistor T6 is a low level voltage, so that the second electrode of the storage capacitor C1 is initialized to a low level during the reset period, where reference is made.
  • the potential of the voltage V ini is lower than the 0th-order ideal gray scale voltage V gray-0 .
  • the ideal gray scale voltage Vgray is inevitably larger than the feedback voltage V FB at the beginning, at this time, the control signal SW is at a low level, the fourth compensation thin film transistor T9 is turned on, and the high level compensation voltage V high is via
  • the switching thin film transistor T2 is output to the second electrode of the storage capacitor C1, and the storage capacitor C1 is charged, so that the gate voltage Vg of the driving thin film transistor T1 is gradually increased, so that the feedback current I FB is gradually increased, and correspondingly, the feedback voltage V FB is also Gradually, when the feedback voltage V FB is increased to be equal to the ideal gray scale voltage Vgray, the control signal SW outputted by the comparison control unit 120 is switched from the low level to the high level, and the fourth compensation thin film transistor T9 is turned off, thereby high voltage.
  • the flat compensation voltage V high stops charging the storage capacitor C1, and the second electrode of the storage capacitor C1 is maintained at the current voltage. Thereafter, in the illuminating period, according to the gate voltage Vg of the driving thin film transistor T1, the driving current flowing through the OLED is a desired driving current, so that the light emitted from the OLED reaches a desired appropriate brightness, thereby displaying the AMOLED display panel. Good performance.
  • the compensation circuit 100 when the ideal gray scale voltage Vgray in the two compensation circuits 100 is the same, the driving current flowing through the two OLEDs during the lighting period is also the same, not because the driving thin film transistor T1 The OLED illumination is different due to the drift of the threshold voltage and the impedance of the panel trace, so that the display stability of the AMOLED display panel is good.
  • the present invention has the following advantages:
  • the OLED drive compensation circuit further includes a compensation circuit that receives the feedback current flowing through the second end of the driving thin film transistor and generates a compensation voltage according to the feedback current, and the compensation voltage is output to the storage capacitor via the switching thin film transistor. Therefore, the compensation voltage can compensate the voltage on the second electrode of the storage capacitor, that is, the voltage at the gate of the driving thin film transistor is compensated, so that the driving current flowing through the OLED can reach a desired size, and the OLED can reach the desired level.
  • the required brightness and gray scale can overcome the influence of the threshold voltage and the impedance of the panel trace on the driving current, so that the display stability of the AMOLED display panel is better.

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Abstract

本发明实施例公开了一种OLED驱动补偿电路，包括OLED、存储电容、驱动薄膜晶体管、开关薄膜晶体管、发光薄膜晶体管和初始薄膜晶体管；其中，所述OLED驱动补偿电路还包括补偿电路，所述补偿电路接收驱动薄膜晶体管第二端流过的反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容以对其进行补偿。本发明实施例还公开了一种AMOLED显示面板。采用本发明，具有改善AMOLED显示面板的显示稳定性欠佳的优点。

Description

OLED驱动补偿电路及AMOLED显示面板
本发明要求2017年11月14日递交的发明名称为“OLED驱动补偿电路及AMOLED显示面板”的申请号201711120213.8的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及显示驱动技术领域，特别是涉及一种OLED驱动补偿电路及AMOLED显示面板。
背景技术
有机发光二极管(Organic Light-Emitting Diode，OLED)显示面板因具有因为具备轻薄、节能、宽视角、色域广、对比度高等特性而备受人们的青睐，有机发光二极管显示面板分为被动式有机发光二极管显示面板(PMOLED)和主动式有机发光二极管显示面板(AMOLED)。
然而，AMOLED显示面板仍然有较明显的缺陷。例如：由于面板制作不均匀，各个驱动薄膜晶体管的阈值电压不同，导致像素间发光存在显示差异，现有技术尽管通过一些补偿技术解决了阈值电压的影响，但代价是复杂的补偿电路使像素开口率减小；另外，由于面板自身走线的阻抗，导致面板显示亮度下降以及负载电流增大的问题，这些问题在现有市场上流通的产品中依然存在。由此可见，AMOLED显示面板的显示稳定性是行业内的重要课题之一，想要完善这一技术仍然有很长的路要走。
发明内容
本发明实施例所要解决的技术问题在于，提供一种OLED驱动补偿电路及AMOLED显示面板。可改善AMOLED显示面板的显示稳定性欠佳的问题。
为了解决上述技术问题，本发明第一方面实施例提供了一种OLED驱动补偿电路，包括OLED、存储电容、驱动薄膜晶体管、开关薄膜晶体管、发光薄膜晶体管和初始薄膜晶体管；其中，所述存储电容的第一电极接收电源电压， 其第二电极电连接到驱动薄膜晶体管的栅极，所述初始薄膜晶体管的第一端接收参考电压，其第二端电连接到开关薄膜晶体管的第一端，其栅极接收第一开关信号，所述开关薄膜晶体管的第二端电连接到驱动薄膜晶体管的栅极，所述开关薄膜晶体管的栅极接收扫描信号，所述驱动薄膜晶体管的第一端接收电源电压，其第二端电连接到发光薄膜晶体管的第一端，所述发光薄膜晶体管的栅极接收使能信号，其第二端电连接到OLED的正极，所述OLED的负极接收低电平电压；其中，所述OLED驱动补偿电路还包括补偿电路，所述补偿电路接收驱动薄膜晶体管第二端流过的反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容以对其进行补偿。
其中，所述OLED驱动补偿电路的一个周期包括复位时间段、补偿时间段和发光时间段，其中，
在复位时间段，所述初始薄膜晶体管、开关薄膜晶体管导通，所述参考电压经由初始薄膜晶体管、开关薄膜晶体管输送到存储电容的第二电极；
在补偿时间段，所述初始薄膜晶体管截止，所述开关薄膜晶体管继续导通，所述补偿电路接收所述反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容的第二电极；
在发光时间段，所述开关薄膜晶体管截止，所述发光薄膜晶体管导通，所述OLED发光。
其中，所述补偿电路包括电压转换单元、比较控制单元和补偿电压生成单元，所述电压转换单元接收反馈电流并根据反馈电流转换为对应的反馈电压，所述比较控制单元分别接收反馈电压和理想灰阶电压，并根据反馈电压和理想灰阶电压的比较结果输出控制信号，所述补偿电压生成单元接收所述控制信号并生成补偿电压经由开关薄膜晶体管输出给存储电容的第二电极。
其中，所述补偿电压生成单元包括第一补偿薄膜晶体管、第二补偿薄膜晶体管和第三补偿薄膜晶体管，所述控制信号包括第二开关信号和第三开关信号，所述第一补偿薄膜晶体管的栅极接收所述第二开关信号，其第一端接收高电平补偿电压，其第二端电连接到第三补偿薄膜晶体管的第一端，所述第二补偿薄膜晶体管的第一端电连接到第三补偿薄膜晶体管的第一端，其栅极接收第 二开关信号，其第二端接收低电平补偿电压，所述第三补偿薄膜晶体管的第二端电连接到开关薄膜晶体管的第一端，所述第三补偿薄膜晶体管的栅极接收第三开关信号，其中，同一时刻，第一补偿薄膜晶体管和第二补偿薄膜晶体管其中之一导通，所述第三开关信号通过控制第三补偿薄膜晶体管的导通或截止控制补偿电压输出给存储电容的第二电极。
其中，所述参考电压为低电平电压，所述补偿电压生成单元包括第四补偿薄膜晶体管，所述第四补偿薄膜晶体管的第一端接收高电平补偿电压，其第二端电连接到开关薄膜晶体管的第一端，其栅极接收控制信号。
其中，所述补偿电路还包括信号源，所述信号源用于输出理想灰阶电压。
其中，所述信号源用于输出n级理想灰阶电压，其中n为大于或等于2的整数，所述信号源包括n-1个电阻，所述n-1个电阻用于输出n-1级理想灰阶电压，所述n-1个电阻的阻值之比为：
Figure PCTCN2017116923-appb-000001
其中，γ为预定伽马值。
其中，所述n为2M，其中M为正整数。
其中，所述OLED驱动补偿电路还包括用于维持存储电容的第二电极上电压的维持电容，所述维持电容的第一电极电连接到开关薄膜晶体管的第一端，其第二电极电性接地。
本发明第二方面实施例提供了一种AMOLED显示面板，包括上述的OLED驱动补偿电路。
实施本发明实施例，具有如下有益效果：
由于OLED驱动补偿电路还包括补偿电路，所述补偿电路接收驱动薄膜晶体管第二端流过的反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容。从而补偿电压可以对存储电容的第二电极上的电压进行补偿，也即对驱动薄膜晶体管的栅极处的电压进行补偿，从而流过OLED的驱动电流可以达到想要的大小，OLED上达到想要的亮度和灰阶，从而可以克服阈值电压、面板走线的阻抗等因素对驱动电流的影响，从而 AMOLED显示面板的显示稳定性较好。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明第一实施例OLED驱动补偿电路的示意图；
图2是本发明第一实施例OLED驱动补偿电路的时序图；
图3是本发明另一实施例OLED驱动补偿电路的时序图；
图4是本发明第一实施例信号源中的伽马电路中的电阻串联示意图；
图5是本发明第二实施例OLED驱动补偿电路的示意图；
图6是本发明第二实施例OLED驱动补偿电路的时序图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本申请说明书、权利要求书和附图中出现的术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。此外，术语“第一”、“第二”和“第三”等是用于区别不同的对象，而并非用于描述特定的顺序。
第一实施例
本发明实施例提供一种OLED驱动补偿电路，请参见图1，OLED驱动补偿电路包括OLED、存储电容C1、驱动薄膜晶体管T1、开关薄膜晶体管T2、发 光薄膜晶体管T4和初始薄膜晶体管T6。
在本实施例中，所述OLED用于发光，提供亮度供用户观察。存储电容C1的第一电极接收电源电压OVDD，在本实施例中，电源电压OVDD为高电平电源电压，存储电容C1的第二电极电连接到驱动薄膜晶体管T1的栅极；所述初始薄膜晶体管T6的第一端接收参考电压Vref，所述参考电压Vref用于对存储电容C1进行初始化，使存储电容C1放电或者充电使其第二电极的电压为参考电压Vref，所述初始薄膜晶体管T6的第二端电连接到开关薄膜晶体管T2的第一端，所述初始薄膜晶体管T6的栅极接收第一开关信号SW1；所述开关薄膜晶体管T2的第二端电连接到驱动薄膜晶体管T1的栅极和存储电容C1的第二电极，开关薄膜晶体管T2的栅极接收扫描信号Scan；驱动薄膜晶体管T1的第一端接收电源电压OVDD，驱动薄膜晶体管T1的第二端电连接至发光薄膜晶体管T4的第一端，发光薄膜晶体管T4的栅极接收使能信号EM，发光薄膜晶体管T4的第二端电连接到OLED的正极，OLED的负极加载低电平电压OVSS，所述低电平电压OVSS为低电平电源电压或者地。在本实施例中，驱动薄膜晶体管T1、开关薄膜晶体管T2、发光薄膜晶体管T4和初始薄膜晶体管T6的第一端为源极，第二端为漏极。在本发明的其他实施例中，驱动薄膜晶体管、开关薄膜晶体管、发光薄膜晶体管和初始薄膜晶体管的第一端为漏极，第二端为源极。在本实施例中，驱动薄膜晶体管T1、开关薄膜晶体管T2、发光薄膜晶体管T4和初始薄膜晶体管T6为N型薄膜晶体管。在本发明的其他实施例中，驱动薄膜晶体管、开关薄膜晶体管、发光薄膜晶体管和初始薄膜晶体管为P型薄膜晶体管，此时，后面提到的时序信号作相应变化。在本发明的其他实施例中，驱动薄膜晶体管、开关薄膜晶体管、发光薄膜晶体管和初始薄膜晶体管不需要为相同类型的薄膜晶体管。
为了消除背景技术中各种因素对OLED驱动电流的影响，例如驱动薄膜晶体管T1阈值电压的漂移、面板走线的阻抗等因素对OLED驱动电流的影响。在本实施例中，OLED驱动补偿电路还包括补偿电路100，所述补偿电路100接收驱动薄膜晶体管T1第二端流过的反馈电流IFB，在本实施例中，反馈电流IFB与后面提到的OLED的驱动电流成线性关系，较佳的，通过对补偿电路110的调整，反馈电流IFB与后面提到的OLED的驱动电流相等。在本实施例中，补偿 电路100根据反馈电流IFB生成补偿电压，补偿电压经由开关薄膜晶体管T2输出给存储电容C1，例如，当反馈电流IFB比想要的电流小时，则补偿电路100将高电平的补偿电压输出给存储电容C1，从而存储电容C1上的电压增大，使反馈电流IFB逐渐增大，一直补偿到反馈电流IFB达到想要的电流，此时停止将高电平的补偿电压输出给存储电容C1，此时存储电容C1第二电极处的电压达到想要的电压，从而驱动薄膜晶体管T1栅极的电压Vg达到想要的电压，此后OLED发光时，流过OLED的驱动电流达到想要的驱动电流，从而OLED的发光达到想要的亮度，也即达到想要的灰阶；反之则为低电平的补偿电压输出给存储电容C1，存储电容C1进行放电。在本实施例中，不管是对存储电容C1充电或者放电，目的均为使OLED的驱动电流达到想要的驱动电流，最终OLED的发光达到想要的亮度和灰阶，从而可以尽量改善外在因素对OLED的驱动电流的影响，从而OLED的发光稳定。
图2是本发明实施例OLED驱动补偿电路的时序图，以下通过图1和图2描述OLED驱动电路如何动作。在本实施例中，OLED驱动补偿电路的时序呈周期性，OLED驱动补偿电路的一个周期包括复位时间段、补偿时间段和发光时间段。
在复位时间段(图2中t1-t2时间段)，所述扫描信号Scan和第一开关信号SW1为高电平，初始薄膜晶体管T6、开关薄膜晶体管T2导通，从而，参考电压Vref经由初始薄膜晶体管T6、开关薄膜晶体管T2输送到存储电容C1的第二电极处，实现对存储电容C1上电压的初始化，在本实施例中为对存储电容C1进行充电。
在补偿时间段(图2中t2-t4时间段)，扫描信号Scan继续保持为高电平，开关薄膜晶体管T2继续导通，此时第一开关信号SW1为低电平，初始薄膜晶体管T6截止。同时，驱动薄膜晶体管T1、补偿电路100形成回路，补偿电路100会接收到反馈电流IFB，所述反馈电流IFB可以为0安培或者大于0安培的电流，所述补偿电路100根据反馈电流IFB生成补偿电压，所述补偿电压经由开关薄膜晶体管T2输出给存储电容C1的第二电极和驱动薄膜晶体管T1的栅极，从而反馈电流IFB进行相应增加或者减小。在本实施例中，请参见图2，经过补偿后，所述存储电容C1的第一电极处的电压得到减小，从而驱动薄 膜晶体管T1栅极处的电压Vg得到减小，从而驱动薄膜晶体管T1栅极与第一端之间的电压得到减小，从而反馈电流IFB和在发光时间段的驱动电流得到减小，从而在发光阶段OLED的发光亮度得到降低，可以达到想要的亮度。另外，在本发明的其他实施例中，请参见图3，经过补偿后，所述存储电容C1的第一电极处的电压得到增加，从而驱动薄膜晶体管T1的栅极处的电压Vg得到增加，驱动薄膜晶体管T1栅极与第一端之间的电压得到增加，从而反馈电流IFB和在发光时间段的驱动电流得到增加，从而在发光阶段OLED的发光亮度得到增加，可以达到想要的亮度。
在发光时间段(图2中t4之后的时间段)，使能信号EM为高电平，发光薄膜晶体管T4导通，驱动薄膜晶体管T1、发光薄膜晶体管T4、OLED形成导通的回路，OLED上流过驱动电流，OLED会发光。在本实施例中，通过补偿电路100的补偿，流过OLED的驱动电流达到想要的大小，从而OLED上达到想要的亮度和灰阶，从而可以克服阈值电压、面板走线的阻抗等因素对驱动电流的影响，此时存储电容C1第二电极处的电压为对应想要的驱动电流的电压。而且，在该时间段，输送反馈电流IFB给补偿电路100的回路被截断，从而防止驱动电流被分散，影响OLED的亮度。具体说来，请参见图1，OLED驱动补偿电路还包括反馈薄膜晶体管T3，反馈薄膜晶体管T3的第一端电连接驱动薄膜晶体管T1的第二端，所述反馈薄膜晶体管T3的第二端电连接到所述补偿电路100，所述反馈薄膜晶体管T3的栅极接收扫描信号Scan。根据图2的时序，反馈薄膜晶体管T3在复位时间段和补偿时间段导通，在发光时间段截止。
为了实现补偿电路100根据反馈电流IFB生成补偿电压以对存储电容C1的第二电极进行补偿，请继续参见图1，补偿电路100包括电压转换单元110、比较控制单元120和补偿电压生成单元130，所述电压转换单元110接收反馈电流IFB，具体说来电压转换单元110与反馈薄膜晶体管T3的第二端电连接。电压转换单元110根据反馈电流IFB转换为对应的反馈电压VFB，在此处，反馈电压VFB与反馈电流IFB成正比，而且，在本实施例中，反馈电压VFB为此条件下发光时间段OLED驱动电流对应的当前灰阶电压Ugray，也即不对存储电容C1的第二电极进行补偿的条件下在发光时间段，OLED流过驱动电流，OLED进行发光，此时OLED发出的亮度对应的当前灰阶电压Ugray等于反馈电压VFB。 在本实施例中，未对存储电容C1第二电极的电压进行补偿时OLED发出的亮度对应的当前灰阶电压Ugray、反馈电流IFB、反馈电压VFB之间的关系如下：
Ugray＝σ·IFB＝VFB
其中，σ为转换系数，转换系数可调。
在本实施例中，比较控制单元120分别接收反馈电压VFB和理想灰阶电压Vgray，在此处，理想灰阶电压Vgray是想要显示的灰阶对应的电压，也即为最开始的数据电压，理想灰阶电压Vgray对应想要显示的灰阶和亮度。从而，比较理想灰阶电压Vgray和反馈电压VFB两者的大小，根据比较结果可知当前OLED将要发的光是否达到想要的灰阶，也即此时的亮度是否符合要求，当所述反馈电压VFB小于理想灰阶电压Vgray时，此时代表当前情况下在发光时间段流过OLED的驱动电流较小，OLED将要发出的光达不到想要的亮度，也即小于想要的灰阶，从而，需要提高驱动薄膜晶体管T1栅极处的电压Vg，也即需要提高存储电容C1的第二电极处的电压，从而，通过补偿电压对存储电容C1充电，使存储电容C1第二电极处的电压升高。相反的，当反馈电压VFB大于理想灰阶电压Vgray时，此时代表当前情况下在发光时间段流过OLED的驱动电流较大，OLED上将要发出的光超过了想要的亮度，也即大于想要的灰阶，从而，需要降低驱动薄膜晶体管T1栅极处的电压Vg，也即需要降低存储电容C1的第二电极处的电压，从而，通过补偿电压对存储电容C1放电，降低存储电容C1的第二电极处的电压。在本实施例中，所述比较控制单元120根据比较结果输出控制信号给所述补偿电压生成单元130。在本实施例中，所述控制信号包括第二开关信号SW2和第三开关信号SW3，所述补偿电压包括高电平补偿电压Vhigh和低电平补偿电压Vlow。
在本实施例中，所述补偿电压生成单元130接收所述控制信号并生成补偿电压，补偿电压经由开关薄膜晶体管T2输出给存储电容C1的第二电极，以对存储电容C1的第二电极进行充电或者放电。具体说来，补偿电压生成单元130包括第一补偿薄膜晶体管T7、第二补偿薄膜晶体管T8和第三补偿薄膜晶体管T5，所述第一补偿薄膜晶体管T7的栅极接收第二开关信号SW2，所述第一补偿薄膜晶体管T7的第一端接收高电平补偿电压Vhigh，所述第一补偿薄膜晶体管T7的第二端电连接到第三补偿薄膜晶体管T5的第一端，第二补偿薄膜晶体 管T8的栅极接收第二开关信号SW2，第二补偿薄膜晶体管T8的第一端电连接到第三补偿薄膜晶体管T5的第一端，第二补偿薄膜晶体管T8的第二端接收低电平补偿电压Vlow；第三补偿薄膜晶体管T5的第二端电连接到开关薄膜晶体管T2的第一端，第三补偿薄膜晶体管T5的栅极接收第三开关信号SW3。在本实施例中，同一时刻，第一补偿薄膜晶体管T7和第二补偿薄膜晶体管T8只有其中之一导通，在本实施例中，所述第一补偿薄膜晶体管T7为P型薄膜晶体管，所述第二补偿薄膜晶体管T8为N型薄膜晶体管。在本发明的其他实施例中，所述第一补偿薄膜晶体管为N型薄膜晶体管，第二补偿薄膜晶体管为P型薄膜晶体管。在本实施例中，第三补偿薄膜晶体管T5为N型薄膜晶体管。在本发明的其他实施例中，第三补偿薄膜晶体管为P型薄膜晶体管。
以下结合图1和图2来描述补偿电路100如何动作。在补偿时间段，一般说来，第三开关信号SW3为高电平，从而第三补偿薄膜晶体管T5导通，第二开关信号SW2根据比较控制单元120的结果为低电平信号或者高电平。具体说来，当比较控制单元120的结果为反馈电压VFB小于理想灰阶电压Vgray时，此时第二开关信号SW2为低电平，从而第一补偿薄膜晶体管T7导通，第二补偿薄膜晶体管T8截止，高电平补偿电压Vhigh经由第一补偿薄膜晶体管T7、第三补偿薄膜晶体管T5、开关薄膜晶体管T2到达存储电容C1的第二电极，从而给存储电容C1充电，反馈电流IFB逐渐增高；当比较控制单元120的结果为反馈电压VFB大于理想灰阶电压Vgray时，此时第二开关信号SW2为高电平，从而第一补偿薄膜晶体管T7截止，第二补偿薄膜晶体管T8导通，从而低电平补偿电压Vlow经由第二补偿薄膜晶体管T8、第三补偿薄膜晶体管T5、开关薄膜晶体管T2到达存储电容C1的第二电极，从而存储电容C1的第二电极进行放电，反馈电流IFB逐渐降低。随着反馈电流IFB升高或者降低，所述反馈电压VFB也逐渐升高或降低，从而，当反馈电压VFB等于理想灰阶电压Vgray时，此时，比较控制单元120控制第三开关信号SW3为低电平，此时，第三补偿薄膜晶体管T5截止，从而，高电平补偿电压Vhigh或者低电平补偿电压Vlow停止输出给存储电容C1的第二电极，存储电容C1的第二电极维持为当前的电压，也即驱动薄膜晶体管T1的栅极维持为当前的电压，从而在发光时间段，所述OLED上流过的驱动电流为想要大小，从而OLED发出的光达到想要的亮度。
为了得到理想灰阶电压Vgray，在本实施例中，所述补偿电路100还包括信号源140，所述信号源140用于输出理想灰阶电压Vgray。在本实施中，所述信号源140用于输出n级理想灰阶电压Vgray，所述n为大于或等于2的整数，例如，n为2、4、8、16、32、64、128、256等，同一时刻所述信号源只输出一级理想灰阶电压Vgray。在本实施例中，所述n满足为2M，其中，M为正整数，在本实施例中，所述n为256。在本实施例中，信号源140接收数字信号，根据接收到的数字信号信号源140输出对应的理想灰阶电压Vgray。对应n级理想灰阶电压Vgray，所述OLED可以输出n级灰阶，也即OLED可以发出n级的亮度。
在本实施例中，所述信号源140包括伽马电路，请参见图4，所述伽马电路包括n+1个电阻，分别为电阻Ra、电阻R1、电阻R2、电阻R3、…、电阻R254、电阻R255、电阻Rb，其中，该n+1个电阻串联，电阻Ra远离R1的一端接收低电平电源GVSS，电阻Rb远离R255的一端接收高电平电源GVDD，其中，电阻Rb用于调节R255处输出的第256级理想灰阶电压Vgrax-255大小，电阻Ra用于调节Ra处输出的第1级理想灰阶电压Vgrax-0的大小，从而电阻Ra、电阻Rb的阻值根据第256级理想灰阶电压Vgrax-255、第1级理想灰阶电压Vgrax-0进行设定。
为了减少后面的伽马校正，在本实施例中，1-255级理想灰阶电压Vgray满足指数为γ的的gama曲线公式，即：
Figure PCTCN2017116923-appb-000002
其中，Vgrax-x为第x级理想灰阶电压，1≤x≤255，γ为预定伽马值,γ在本实施例中一般取2.2，当然，在本发明中，γ的值根据实际需要进行设定。在本实施例中，相邻两级理想灰阶电压Vgray的差值如下：
Figure PCTCN2017116923-appb-000003
Figure PCTCN2017116923-appb-000004
·
·
·
Figure PCTCN2017116923-appb-000005
由于R1、R2、…、R255串联，从而：
Figure PCTCN2017116923-appb-000006
在本实施例中，由于R1：R1：R3、…、R255满足上面的式子，从而本实施例的伽马电路只需要包括n+1个电阻，相对现有技术的伽马电路少则上千个串联的同阻值的小电阻，多则几千个同阻值的小电阻，本实施例既可以实现输出n级理想灰阶电压Vgray，同时信号源140中的伽马电路包括的电阻数目极大的减少，从而极大的简化了伽马电路和信号源140。而且，由于R1：R1：R3：…：R255满足上面的式子，从而，对应的理想灰阶电压Vgray也满足指数为γ的伽马调整，从而OLED的亮度也自动满足指数为γ的gamma调整，从而节省了后期伽马校准的工作。
另外，为了维持存储电容C1的第二电极处的电压，在本实施例中，请继续参见图1，OLED驱动补偿电路还包括维持电容C2，维持电容C2的第一电极电连接到开关薄膜晶体管T2的第一端，也即所述维持电容C2的第一电极还电连接到初始薄膜晶体管T6的第二端，所述维持电容C2的第二电极电性接地。在复位时间段，参考电压Vref同时对存储电容C1的第一电极和维持电容C2的第一电极进行初始化，当复位时间段结束时，存储电容C1的第一电极和维持电容C2的第一电极的电位为参考电压Vref。在补偿时间段，补偿电压同时对存储电容C1的第一电极和维持电容C2的第一电极进行补偿，当反馈电压VFB等于理想灰阶电压Vgray时，补偿电压停止对存储电容C1的第一电极和维持电容C2的第一电极进行补偿，此时，开关薄膜晶体管T2仍然导通，由于设置了维持电容C2，从而可以防止存储电容C1由于漏电而导致其第二电极处的 电压快速降低。
本发明实施例还提供一种AMOLED显示面板，AMOLED显示面板包括上述的OLED驱动补偿电路。
第二实施例
图5是本发明第二实施例OLED驱动补偿电路的示意图，图5的电路与图1的电路相似，因此相同的元件符号代表相同的元器件。本实施例与第一实施例的主要不同点为补偿电压生成单元。
请参见图5和图6，在本实施例中，所述补偿电压生成单元230不生成两种补偿电压，只生成一种补偿电压，在本实施例中具体为生成高电平补偿电压Vhigh。当然，在本发明的其他实施例中，也可以根据实际需要只生成低电平补偿电压。在本实施例中，补偿电压生成单元230包括第四补偿薄膜晶体管T9，第四补偿薄膜晶体管T9的第一端接收高电平补偿电压Vhigh，第四补偿薄膜晶体管T9的第二端电连接到开关薄膜晶体管T2的第一端，第四补偿薄膜晶体管T9的栅极接收控制信号SW。在本实施例中，第四补偿薄膜晶体管T9为P型薄膜晶体管的，第四补偿薄膜晶体管T9的第一端为源级，第二端为漏级。另外，在本发明的其他实时例中，第四补偿薄膜晶体管为N型薄膜晶体管的。另外，在本发明的其他实时例中，第四补偿薄膜晶体管的第一端为漏级，第二端为源级。
在本实施例中，初始薄膜晶体管T6第一端接收的参考电压Vini为低电平电压，从而在复位时间段，存储电容C1第二电极处被初始化为低电平，在此处，参考电压Vini的电位低于第0级理想灰阶电压Vgray-0。从而，在补偿时间段，刚开始时理想灰阶电压Vgray必然大于反馈电压VFB，此时，控制信号SW为低电平，第四补偿薄膜晶体管T9导通，高电平补偿电压Vhigh经由开关薄膜晶体管T2输出给存储电容C1的第二电极，存储电容C1进行充电，从而，驱动薄膜晶体管T1的栅极电压Vg逐渐增高，从而反馈电流IFB逐渐提高，对应的，反馈电压VFB也逐渐提高，当反馈电压VFB提高到等于理想灰阶电压Vgray时，此时比较控制单元120输出的控制信号SW由低电平转为高电平，第四补偿薄膜晶体管T9截止，从而高电平补偿电压Vhigh停止给存储电容C1充电， 存储电容C1的第二电极维持为当前的电压。此后，在发光时间段，根据驱动薄膜晶体管T1的栅极电压Vg，流过OLED的驱动电流为想要的驱动电流，从而OLED发出的光达到想要的合适的亮度，从而AMOLED显示面板的显示性能较好。而且，由于通过补偿电路100的补偿，当两个补偿电路100中的理想灰阶电压Vgray相同时，在发光时间段该两个OLED上流过的驱动电流也是相同的，不会因为驱动薄膜晶体管T1阈值电压的漂移、面板走线的阻抗等因素造成OLED发光不一样，从而AMOLED显示面板的显示稳定性较好。
需要说明的是，本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。对于装置实施例而言，由于其与方法实施例基本相似，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
通过上述实施例的描述，本发明具有以下优点：
由于OLED驱动补偿电路还包括补偿电路，所述补偿电路接收驱动薄膜晶体管第二端流过的反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容。从而补偿电压可以对存储电容的第二电极上的电压进行补偿，也即对驱动薄膜晶体管的栅极处的电压进行补偿，从而流过OLED的驱动电流可以达到想要的大小，OLED上达到想要的亮度和灰阶，从而可以克服阈值电压、面板走线的阻抗等因素对驱动电流的影响，从而AMOLED显示面板的显示稳定性较好。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。

Claims (20)

  1. 一种OLED驱动补偿电路，其中，包括OLED、存储电容、驱动薄膜晶体管、开关薄膜晶体管、发光薄膜晶体管和初始薄膜晶体管；其中，所述存储电容的第一电极接收电源电压，其第二电极电连接到驱动薄膜晶体管的栅极，所述初始薄膜晶体管的第一端接收参考电压，其第二端电连接到开关薄膜晶体管的第一端，其栅极接收第一开关信号，所述开关薄膜晶体管的第二端电连接到驱动薄膜晶体管的栅极，所述开关薄膜晶体管的栅极接收扫描信号，所述驱动薄膜晶体管的第一端接收电源电压，其第二端电连接到发光薄膜晶体管的第一端，所述发光薄膜晶体管的栅极接收使能信号，其第二端电连接到OLED的正极，所述OLED的负极接收低电平电压；其中，所述OLED驱动补偿电路还包括补偿电路，所述补偿电路接收驱动薄膜晶体管第二端流过的反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容以对其进行补偿。
  2. 如权利要求1所述的OLED驱动补偿电路，其中，所述OLED驱动补偿电路的一个周期包括复位时间段、补偿时间段和发光时间段，其中，
    在复位时间段，所述初始薄膜晶体管、开关薄膜晶体管导通，所述参考电压经由初始薄膜晶体管、开关薄膜晶体管输送到存储电容的第二电极；
    在补偿时间段，所述初始薄膜晶体管截止，所述开关薄膜晶体管继续导通，所述补偿电路接收所述反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容的第二电极；
    在发光时间段，所述开关薄膜晶体管截止，所述发光薄膜晶体管导通，所述OLED发光。
  3. 如权利要求2所述的OLED驱动补偿电路，其中，所述补偿电路包括电压转换单元、比较控制单元和补偿电压生成单元，所述电压转换单元接收反馈电流并根据反馈电流转换为对应的反馈电压，所述比较控制单元分别接收反馈电压和理想灰阶电压，并根据反馈电压和理想灰阶电压的比较结果输出控制 信号，所述补偿电压生成单元接收所述控制信号并生成补偿电压经由开关薄膜晶体管输出给存储电容的第二电极。
  4. 如权利要求3所述的OLED驱动补偿电路，其中，所述补偿电压生成单元包括第一补偿薄膜晶体管、第二补偿薄膜晶体管和第三补偿薄膜晶体管，所述控制信号包括第二开关信号和第三开关信号，所述第一补偿薄膜晶体管的栅极接收所述第二开关信号，其第一端接收高电平补偿电压，其第二端电连接到第三补偿薄膜晶体管的第一端，所述第二补偿薄膜晶体管的第一端电连接到第三补偿薄膜晶体管的第一端，其栅极接收第二开关信号，其第二端接收低电平补偿电压，所述第三补偿薄膜晶体管的第二端电连接到开关薄膜晶体管的第一端，所述第三补偿薄膜晶体管的栅极接收第三开关信号，其中，同一时刻，第一补偿薄膜晶体管和第二补偿薄膜晶体管其中之一导通，所述第三开关信号通过控制第三补偿薄膜晶体管的导通或截止控制补偿电压输出给存储电容的第二电极。
  5. 如权利要求3所述的OLED驱动补偿电路，其中，所述参考电压为低电平电压，所述补偿电压生成单元包括第四补偿薄膜晶体管，所述第四补偿薄膜晶体管的第一端接收高电平补偿电压，其第二端电连接到开关薄膜晶体管的第一端，其栅极接收控制信号。
  6. 如权利要求3所述的OLED驱动补偿电路，其中，所述补偿电路还包括信号源，所述信号源用于输出理想灰阶电压。
  7. 如权利要求4所述的OLED驱动补偿电路，其中，所述补偿电路还包括信号源，所述信号源用于输出理想灰阶电压。
  8. 如权利要求6所述的OLED驱动补偿电路，其中，所述信号源用于输出n级理想灰阶电压，其中n为大于或等于2的整数，所述信号源包括n-1个电阻，所述n-1个电阻用于输出n-1级理想灰阶电压，所述n-1个电阻的阻值 之比为：
    Figure PCTCN2017116923-appb-100001
    其中，γ为预定伽马值。
  9. 如权利要求8所述的OLED驱动补偿电路，其中，所述n为2M，其中M为正整数。
  10. 如权利要求1所述的OLED驱动补偿电路，其中，所述OLED驱动补偿电路还包括用于维持存储电容的第二电极上电压的维持电容，所述维持电容的第一电极电连接到开关薄膜晶体管的第一端，其第二电极电性接地。
  11. 一种AMOLED显示面板，其中，所述AMOLED显示面板包括OLED驱动补偿电路，所述OLED驱动补偿电路包括OLED、存储电容、驱动薄膜晶体管、开关薄膜晶体管、发光薄膜晶体管和初始薄膜晶体管；其中，所述存储电容的第一电极接收电源电压，其第二电极电连接到驱动薄膜晶体管的栅极，所述初始薄膜晶体管的第一端接收参考电压，其第二端电连接到开关薄膜晶体管的第一端，其栅极接收第一开关信号，所述开关薄膜晶体管的第二端电连接到驱动薄膜晶体管的栅极，所述开关薄膜晶体管的栅极接收扫描信号，所述驱动薄膜晶体管的第一端接收电源电压，其第二端电连接到发光薄膜晶体管的第一端，所述发光薄膜晶体管的栅极接收使能信号，其第二端电连接到OLED的正极，所述OLED的负极接收低电平电压；其中，所述OLED驱动补偿电路还包括补偿电路，所述补偿电路接收驱动薄膜晶体管第二端流过的反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容以对其进行补偿。
  12. 如权利要求11所述的AMOLED显示面板，其中，所述OLED驱动补偿电路的一个周期包括复位时间段、补偿时间段和发光时间段，其中，
    在复位时间段，所述初始薄膜晶体管、开关薄膜晶体管导通，所述参考电 压经由初始薄膜晶体管、开关薄膜晶体管输送到存储电容的第二电极；
    在补偿时间段，所述初始薄膜晶体管截止，所述开关薄膜晶体管继续导通，所述补偿电路接收所述反馈电流，并根据反馈电流生成补偿电压，所述补偿电压经由开关薄膜晶体管输出给存储电容的第二电极；
    在发光时间段，所述开关薄膜晶体管截止，所述发光薄膜晶体管导通，所述OLED发光。
  13. 如权利要求12所述的AMOLED显示面板，其中，所述补偿电路包括电压转换单元、比较控制单元和补偿电压生成单元，所述电压转换单元接收反馈电流并根据反馈电流转换为对应的反馈电压，所述比较控制单元分别接收反馈电压和理想灰阶电压，并根据反馈电压和理想灰阶电压的比较结果输出控制信号，所述补偿电压生成单元接收所述控制信号并生成补偿电压经由开关薄膜晶体管输出给存储电容的第二电极。
  14. 如权利要求13所述的AMOLED显示面板，其中，所述补偿电压生成单元包括第一补偿薄膜晶体管、第二补偿薄膜晶体管和第三补偿薄膜晶体管，所述控制信号包括第二开关信号和第三开关信号，所述第一补偿薄膜晶体管的栅极接收所述第二开关信号，其第一端接收高电平补偿电压，其第二端电连接到第三补偿薄膜晶体管的第一端，所述第二补偿薄膜晶体管的第一端电连接到第三补偿薄膜晶体管的第一端，其栅极接收第二开关信号，其第二端接收低电平补偿电压，所述第三补偿薄膜晶体管的第二端电连接到开关薄膜晶体管的第一端，所述第三补偿薄膜晶体管的栅极接收第三开关信号，其中，同一时刻，第一补偿薄膜晶体管和第二补偿薄膜晶体管其中之一导通，所述第三开关信号通过控制第三补偿薄膜晶体管的导通或截止控制补偿电压输出给存储电容的第二电极。
  15. 如权利要求13所述的AMOLED显示面板，其中，所述参考电压为低电平电压，所述补偿电压生成单元包括第四补偿薄膜晶体管，所述第四补偿薄膜晶体管的第一端接收高电平补偿电压，其第二端电连接到开关薄膜晶体管 的第一端，其栅极接收控制信号。
  16. 如权利要求13所述的AMOLED显示面板，其中，所述补偿电路还包括信号源，所述信号源用于输出理想灰阶电压。
  17. 如权利要求14所述的AMOLED显示面板，其中，所述补偿电路还包括信号源，所述信号源用于输出理想灰阶电压。
  18. 如权利要求16所述的AMOLED显示面板，其中，所述信号源用于输出n级理想灰阶电压，其中n为大于或等于2的整数，所述信号源包括n-1个电阻，所述n-1个电阻用于输出n-1级理想灰阶电压，所述n-1个电阻的阻值之比为：
    Figure PCTCN2017116923-appb-100002
    其中，γ为预定伽马值。
  19. 如权利要求18所述的AMOLED显示面板，其中，所述n为2M，其中M为正整数。
  20. 如权利要求11所述的AMOLED显示面板，其中，所述OLED驱动补偿电路还包括用于维持存储电容的第二电极上电压的维持电容，所述维持电容的第一电极电连接到开关薄膜晶体管的第一端，其第二电极电性接地。
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