WO2015176425A1 - Circuit d'excitation de pixel, dispositif d'affichage et procédé d'excitation de pixel - Google Patents

Circuit d'excitation de pixel, dispositif d'affichage et procédé d'excitation de pixel Download PDF

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Publication number
WO2015176425A1
WO2015176425A1 PCT/CN2014/086491 CN2014086491W WO2015176425A1 WO 2015176425 A1 WO2015176425 A1 WO 2015176425A1 CN 2014086491 W CN2014086491 W CN 2014086491W WO 2015176425 A1 WO2015176425 A1 WO 2015176425A1
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Prior art keywords
switch tube
pole
tube
line
pixel driving
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PCT/CN2014/086491
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English (en)
Chinese (zh)
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杨盛际
孙泽斌
王春雷
刘英明
李伟
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京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Publication of WO2015176425A1 publication Critical patent/WO2015176425A1/fr

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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]

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a pixel driving circuit, a display device including the pixel driving circuit, and a pixel driving method.
  • AMOLED display is one of the hotspots in the field of flat panel display research. Compared with liquid crystal display (LCD), AMOLED display has low energy consumption, low production cost, self-illumination, wide viewing angle and fast response. And so on, at present, in the display field of mobile phones, PDAs, digital cameras, etc., AMOLED displays have begun to replace traditional LCD displays. Pixel driving is the core technical content of AMOLED display, which has important research significance.
  • the pixel driving circuit of the conventional AMOLED display employs a 2T1C pixel driving circuit.
  • the circuit consists of a drive TFT (ie T2), a switching TFT (ie T1) and a storage capacitor Cs.
  • Vscan is a low level signal
  • T1 is turned on
  • the data signal Vdata is written to the storage capacitor Cs.
  • Vscan becomes a high level signal
  • T1 is off.
  • the gate voltage stored on Cs drives T2 to generate a current to drive the OLED, ensuring that the OLED continues to emit light during one frame display.
  • the current of the driving TFT ie, T2
  • I OLED K(V GS - V th ) 2 .
  • the threshold voltage (V th ) of the driving TFT of each pixel may drift due to the manufacturing process and device aging, etc., which causes the current of the OLED flowing through each pixel to change due to the change of the V th of the driving TFT. .
  • the currents of the OLEDs flowing through the respective pixel points are directly different, so that the display brightness of each pixel point is not uniform, thereby affecting the display effect of the entire image.
  • the present invention provides a pixel driving circuit, a display device including the pixel driving circuit, and a pixel driving method.
  • the pixel driving circuit sets the compensation unit so that the operating current of the driving unit is no longer affected by the threshold voltage thereof, thereby eliminating the influence of the threshold voltage of the driving unit on its operating current, completely solving the manufacturing process and the long time of the driving unit.
  • the problem of the influence of the threshold voltage drift on the operating current caused by the operation and the like, thereby ensuring uniform display brightness of the light-emitting element and improving the display effect of the entire image.
  • the present invention provides a pixel driving circuit for driving a light emitting element, including a signal line, a control line, a power supply unit, and a driving unit, and further includes a compensation unit, the signal line, the control line, and the power supply
  • the unit and the driving unit are both connected to the compensation unit; the power supply unit and the driving unit are respectively configured to supply a voltage and drive the light emitting element to cause the light emitting element to emit light; the signal line and the The control lines are respectively used to provide a data signal and a control signal for the compensation unit; the compensation unit is configured to perform threshold voltage compensation on the driving unit according to the data signal and the control signal.
  • the control line includes a first scan line, a second scan line, and a third scan line;
  • the power supply unit includes a first power terminal and a second power terminal;
  • the driving unit includes a driving tube;
  • the compensation unit The first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the capacitor;
  • the gate of the first switch tube is connected to the third scan line, and the first switch tube is first a pole connected to the first power terminal, a second pole of the first switch tube is respectively connected to a second pole of the second switch tube and a first pole of the drive tube;
  • the second switch tube a gate is respectively connected to the gates of the second scan line and the fourth switch tube, a first pole of the second switch tube is connected to the signal line, and a second pole of the second switch tube is respectively Connected to the second pole of the first switch tube and the first pole of the drive tube;
  • the gate of the third switch tube is connected to the first scan line, and the first pole of the third switch tube Connected to the signal
  • the compensation unit further includes a fifth switch tube, the gates of the fifth switch tubes are respectively connected to the third scan line and the gate of the first switch tube, and the fifth switch tube
  • the first pole is respectively connected to the second pole of the driving tube and the second pole of the fourth switching tube
  • the second pole of the fifth switching tube is connected to the first pole of the light emitting element.
  • the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the drive tube are all P-type thin film transistors.
  • the first scan line and the second scan line are gated, the third scan line is turned off, the second switch tube, the third switch The tube and the fourth switch tube are opened, the first switch tube and the fifth switch tube are turned off, so that the data signal provided by the signal line charges the gate of the drive tube, and The gate of the drive transistor is brought to a voltage that compensates for its threshold voltage.
  • the first scan line remains strobed, the second scan line is turned off, the third scan line is strobed, the first switch tube, the first switch The third switch tube and the fifth switch tube are turned on, the second switch tube and the fourth switch tube are turned off, and the signal line is applied with the same data signal as the charging phase in the driving phase.
  • the first scan line remains strobed, the second scan line is turned off, the third scan line is strobed, the first switch tube, the first switch The third switch tube and the fifth switch tube are turned on, the second switch tube and the fourth switch tube are turned off, and the signal line is applied on the basis of the data signal of the charging phase during the driving phase. Jumping data signal.
  • the absolute value of the data signal after the data signal of the charging phase and the data signal of the hopping are superposed is greater than the absolute value of the data signal of the charging phase.
  • the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the drive tube are all N-type thin film transistors.
  • the first power terminal provides an operating voltage
  • the second power terminal provides a reference voltage
  • the operating voltage is greater than the reference voltage
  • a first positive pole of the light emitting element and a second light emitting component Extremely negative.
  • the first power terminal provides a reference voltage
  • the second power terminal provides an operating voltage
  • the operating voltage is greater than the reference voltage
  • the first extreme anode of the light emitting element
  • the second of the light emitting component Extremely positive.
  • the present invention also provides a display device including the above pixel driving circuit.
  • the present invention also provides a pixel driving method, which is implemented by the above pixel driving circuit, the pixel driving method comprising: causing the power supply unit to supply power to the light emitting element under control of the control line; Causing the driving unit to drive the light emitting element under the control of the control line to cause the light emitting element to emit light; and causing the signal line to provide a data signal to the compensation unit under the control of the control line And causing the compensation unit to perform threshold voltage compensation on the driving unit under the control of the control line.
  • the compensation unit is caused to charge the driving unit according to the data signal under the control of the control line; in the driving phase, the compensation unit is caused to perform threshold voltage on the driving unit make up.
  • the compensation unit can perform threshold voltage compensation on the driving unit according to the data signal on the signal line and the control signal on the control line, so that the operating current of the driving unit is no longer subject to the threshold voltage thereof.
  • the influence eliminates the influence of the threshold voltage of the driving unit on its working current, and completely solves the problem that the driving voltage of the driving unit affects the working current due to the manufacturing process and long-time operation, thereby ensuring the illumination.
  • the display brightness of the component is uniform and the display of the entire image is improved.
  • the display brightness of the display device can be made more uniform, thereby improving the display effect of the display device.
  • FIG. 1 is a schematic structural view of a pixel driving circuit in the prior art.
  • FIG. 2 is a schematic structural view of a pixel driving circuit in Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of the pixel driving circuit of FIG. 2 in a charging phase.
  • FIG. 4 is a timing chart of driving of the pixel driving circuit of FIG. 2.
  • FIG. 5 is a schematic diagram of the pixel driving circuit of FIG. 2 in a driving stage.
  • the embodiment provides a pixel driving circuit for driving a light emitting element to emit light, including a signal line, a control line, a power supply unit, and a driving unit, and further including a compensation unit, in the pixel driving circuit,
  • the signal line, the control line, the power supply unit and the driving unit are all connected with the compensation unit;
  • the power supply unit and the driving unit are respectively used for supplying power and driving the light emitting element;
  • the signal line and the control line are respectively used for providing data signals and control for the compensation unit;
  • the compensation unit is configured to perform threshold voltage compensation on the driving unit according to the data signal and the control signal.
  • the control line includes a first scan line EM, a second scan line Scan(1), and a third scan line Scan(2);
  • the power supply unit includes a first power terminal U1 and a second power terminal U2;
  • the driving tube T6 is included;
  • the compensation unit includes a first switching tube T1, a second switching tube T2, a third switching tube T3, a fourth switching tube T4, and a capacitor C.
  • the gate of the first switch T1 is connected to the third scan line Scan(2).
  • the first pole of the first switch T1 is connected to the first power terminal U1, and the second pole of the first switch T1 is respectively connected to the second switch.
  • the second pole of the tube T2 is connected to the first pole of the drive tube T6.
  • the gates of the second switch tube T2 are respectively connected to the gates of the second scan line Scan(1) and the fourth switch tube T4, and the first pole of the second switch tube T2 is connected to the signal line, and the second switch tube
  • the second pole of T2 is respectively connected to the second pole of the first switching transistor T1 and the first pole of the driving tube T6.
  • the gate of the third switch T3 is connected to the first scan line EM, the first pole of the third switch T3 is connected to the signal line, and the second pole of the third switch T3 is connected to the first pole of the capacitor C.
  • the gate of the fourth switching transistor T4 is respectively connected to the gate of the second switching transistor T2 and the second scanning line Scan(1), and the first pole of the fourth switching transistor T4 is respectively connected to the gate of the driving tube T6 and the capacitor C.
  • the second pole is connected, and the second pole of the fourth switch tube T4 is respectively connected to the first pole of the light emitting element OLED and the second pole of the driving tube T6; the second pole of the light emitting element OLED is connected to the second power terminal U2.
  • the first pole of the capacitor C is connected to the second pole of the third switch transistor T3, and the second pole of the capacitor C is respectively connected to the gate of the driving transistor T6 and the first pole of the fourth switching transistor T4.
  • the compensation unit further includes a fifth switch tube T5, and the gates of the fifth switch tube T5 are respectively connected to the gates of the third scan line Scan(2) and the first switch tube T1, and the fifth switch tube T5
  • the first pole is connected to the second pole of the driving tube T6 and the second pole of the fourth switching transistor T4, respectively, and the second pole of the fifth switching transistor T5 is connected to the first pole of the light emitting element OLED.
  • the first switch tube T1, the second switch tube T2, the third switch tube T3, the fourth switch tube T4, the fifth switch tube T5, and the drive tube T6 are all P-type thin film transistors, so that organic light emission can be reduced.
  • the process of the display there are only three control lines in the above pixel driving circuit, which can save energy consumption of the pixel driving circuit and reduce interference between lines.
  • the first switch tube T1, the second switch tube T2, the third switch tube T3, the fourth switch tube T4, the fifth switch tube T5, and the drive tube T6 may also have a strobe.
  • Other types of switching transistors that switch functions such as N-type thin film transistors.
  • the thin film transistor when the thin film transistor is turned on, a current is generated between the first pole and the second pole.
  • the voltage of the first pole of the thin film transistor is high, current flows from the first pole to the second pole; when the voltage of the second pole of the thin film transistor is high, current flows from the second pole to the first pole.
  • the specific working process of the pixel driving circuit is as follows. As shown in FIGS. 3 and 4, in the charging phase of the pixel driving circuit (ie, the 1st stage in FIG. 4), the first scan line EM and the second scan line Scan(1) are gated, and the third scan line Scan ( 2) Shutdown, the second switch T2, the third switch tube T3 and the fourth switch tube T4 are turned on, and the first switch tube T1 and the fifth switch tube T5 are turned off, so that the data signal provided by the signal line is applied to the gate of the drive tube T6 (ie, point A). Charging is performed and the gate of the drive transistor T6 is brought to a voltage capable of compensating for its threshold voltage.
  • the signal line provides the data signal V data , so that the first pole of the capacitor C (ie, point B) is reset to the V data signal, for example, the potential at point B is V p , and at this time, the second pole of the capacitor C
  • the potential (ie point A) is also V p
  • V p can turn on the drive tube T6, so that the point A is charged, the charging current direction is along the i1 direction in FIG. 3, until the point A is charged to V p -V Th (this voltage is a voltage that can compensate the threshold voltage of the drive tube T6).
  • the pressure difference between the two points A and B is V th .
  • the first scanning line EM is kept strobed, the second scanning line Scan(1) is turned off, and the third scanning is performed.
  • the line Scan(2) is strobed, the first switch tube T1, the third switch tube T3 and the fifth switch tube T5 are opened, the second switch tube T2 and the fourth switch tube T4 are turned off, and the signal line is applied at the driving stage.
  • the data signal ⁇ V data is hopped based on the data signal V data of the charging phase.
  • the potential of the first pole of the capacitor C (ie, point B) is changed from the original V p to V p + ⁇ V data , since the second pole of the capacitor C (ie, point A) is in a floating state, Maintaining the original differential pressure between the two points A and B (ie, V th ), the potential of the gate of the driving tube T6, that is, point A, will undergo an isobaric jump, that is, the potential at point A jumps to V p + ⁇ V data -V th ;
  • the first pole of the driving tube T6 is connected to the working voltage V dd of the first power terminal U1, and the current sequentially passes through the first switching tube T1, the driving tube T6 and the fifth switching tube T5 in the direction of i2.
  • the light emitting element OLED is caused to start to emit light.
  • the driving phase, the absolute value of the charging phase of the data signal V p and the data signal transitions superimposed data signal ⁇ V data (i.e. V p + ⁇ V data) is larger than the absolute value of the charging phase of the data signal V p.
  • I OLED K(V GS –V th ) 2
  • V GS refers to the gate-source voltage when the drive transistor T6 reaches saturation (corresponding to the voltage between the first pole and the gate of the drive transistor T6, that is, V dd -(V p + ⁇ V data -V th )).
  • the operating current I OLED of the driving tube T6 is not affected by the threshold voltage V th , and is only related to the data signal applied on the signal line, thereby eliminating the driving tube.
  • the influence of the threshold voltage of T6 on its working current I OLED completely solves the problem that the threshold voltage drift of the driving tube T6 due to its manufacturing process and long-time operation affects the working current, thereby ensuring the OLED of the light-emitting element.
  • the display brightness is uniform and the display of the entire image is improved.
  • the compensation of the threshold voltage of the driving tube T6 lasts only two stages (ie, the charging phase 1 and the driving phase 2), which shortens the working time of the entire pixel driving circuit, and can efficiently Complete the drive of the entire circuit.
  • the first power terminal U1 provides the operating voltage V dd
  • the second power terminal U2 provides the reference voltage V SS , the first extreme anode of the light emitting element OLED, and the second extreme anode of the light emitting element OLED.
  • the operating voltage V dd > the reference voltage V SS can ensure that the light-emitting element OLED emits light normally.
  • the reference voltage is a ground voltage V SS, i.e. that the reference voltage V SS to zero potential.
  • the first power supply terminal may supply a reference voltage
  • the second power supply terminal may provide an operating voltage
  • the first extreme negative electrode of the light emitting device and the second extremely positive electrode of the light emitting device. Since the normal operating voltage > reference voltage, the current flows from the second power supply terminal of the high potential to the first power supply terminal of the low potential. Therefore, the positive and negative wirings of the light-emitting element are also opposite. In short, as long as there is current in the light-emitting element It can be illuminated by light.
  • the embodiment provides a pixel driving circuit. Unlike the first embodiment, in the driving phase of the pixel driving circuit, the first scan line remains strobed, the second scan line is turned off, and the third scan line is strobed. a switch tube, a third switch tube and a fifth switch tube are opened, second The switch tube and the fourth switch tube are turned off, and the signal line is applied with the same data signal as the charge phase during the drive phase.
  • the potential of the first pole of the capacitor is still V p
  • the potential of the gate of the driving tube is V p -V th , according to the current formula when the driving tube reaches saturation:
  • I OLED K(V GS –V th ) 2
  • the operating current I OLED of the driving tube is also unaffected by its threshold voltage V th , and is only related to the data signal applied on the signal line, thereby eliminating the driving.
  • the influence of the threshold voltage of the tube on its working current I OLED completely solves the problem that the threshold voltage drift of the driving tube due to its manufacturing process and long-time operation affects the working current, thereby ensuring the display brightness of the light-emitting element. Uniform and enhances the display of the entire image.
  • the compensation unit can charge the gate of the driving tube in the charging phase according to the data signal on the signal line and the control signal on the control line, so that the driving tube
  • the gate obtains a voltage capable of compensating for its threshold voltage, thereby performing threshold voltage compensation on the driving tube during the driving phase, so that the operating current of the driving tube is no longer affected by its threshold voltage, thereby eliminating the threshold voltage of the driving tube
  • the influence of its working current completely solves the problem that the threshold voltage drift of the driving tube affects its working current due to its manufacturing process and long-time operation, thereby ensuring uniform display brightness of the light-emitting element and improving the whole The display of the image.
  • the embodiment provides a display device including the pixel driving circuit of any of Embodiments 1 and 2.
  • the display luminance of the display device can be made more uniform, thereby improving the display effect of the display device.
  • the embodiment provides a pixel driving method.
  • the pixel driving method is implemented by the pixel driving circuit of any one of Embodiments 1 and 2.
  • the pixel driving method includes: causing the power supply unit to supply power to the light emitting element under the control of the control line.
  • the driving unit drives the light emitting element under the control of the control line to cause the light emitting element to emit light;
  • the signal line provides a data signal for the compensation unit under the control of the control line; and the compensation unit controls the driving unit under the control of the control line Perform threshold voltage compensation.
  • the compensation unit in the charging phase, is caused to charge the driving unit according to the data signal under the control of the control line; in the driving phase, the compensation unit performs threshold voltage compensation on the driving unit. This shortens the time for pixel driving and enables efficient driving of the entire circuit.
  • the pixel driving method causes the compensation unit to perform threshold voltage compensation on the driving unit under the control of the control line, so that the operating current of the driving unit is no longer affected by the threshold voltage thereof, thereby eliminating the threshold voltage of the driving unit and the operating current thereof.
  • the influence completely solves the problem that the threshold voltage drift of the driving unit affects the working current due to the manufacturing process and long-time operation, thereby ensuring uniform display brightness of the light-emitting element and improving the display effect of the entire image.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

La présente invention concerne un circuit d'excitation de pixel, un dispositif d'affichage et un procédé d'excitation de pixel Le circuit d'excitation de pixels comprend une ligne de signal, une ligne de commande, une unité d'alimentation électrique et une unité d'excitation, et comprend en outre une unité de compensation; la ligne de signal, la ligne de commande, l'unité d'alimentation électrique et l'unité d'excitation sont toutes connectées à l'unité de compensation; l'unité d'alimentation électrique et l'unité d'excitation sont utilisées pour fournir l'alimentation et une excitation à l'élément électroluminescent; la ligne de signal et la ligne de commande sont utilisées pour fournir à l'unité de compensation un signal de données et un signal de commande; l'unité de compensation est utilisée pour effectuer une compensation de tension de seuil de l'unité d'excitation selon le signal de données et le signal de commande. Lorsque le circuit d'excitation de pixels est équipé d'une unité de compensation, le courant opérationnel de l'unité d'excitation n'est plus influencé par sa tension de seuil, c'est-à-dire l'effet de la tension de seuil de l'unité d'excitation sur son courant opérationnel est éliminé et le problème de la dérive de la tension de seuil de l'unité d'excitation causée par le processus technique et un fonctionnement prolongé est entièrement résolu, assurant de cette façon une luminosité d'affichage uniforme de l'élément électroluminescent.
PCT/CN2014/086491 2014-05-19 2014-09-15 Circuit d'excitation de pixel, dispositif d'affichage et procédé d'excitation de pixel WO2015176425A1 (fr)

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