WO2016023311A1 - Circuit d'excitation de pixels, procédé d'excitation de pixels et appareil d'affichage - Google Patents

Circuit d'excitation de pixels, procédé d'excitation de pixels et appareil d'affichage Download PDF

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Publication number
WO2016023311A1
WO2016023311A1 PCT/CN2014/093769 CN2014093769W WO2016023311A1 WO 2016023311 A1 WO2016023311 A1 WO 2016023311A1 CN 2014093769 W CN2014093769 W CN 2014093769W WO 2016023311 A1 WO2016023311 A1 WO 2016023311A1
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signal
module
control
driving
switching unit
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PCT/CN2014/093769
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English (en)
Chinese (zh)
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胡祖权
公伟刚
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京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
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Publication of WO2016023311A1 publication Critical patent/WO2016023311A1/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]
    • 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
    • G09G3/22—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 disclosure relates to a pixel driving circuit, a driving method thereof, and a display device.
  • AMOLED Active Matrix/Organic Light Emitting Diode
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • OLEDs are current driven and require a constant current to control illumination. Due to the process process and device aging, etc., in the known driving circuit, the threshold voltage of the driving TFT of each pixel has non-uniformity, which causes the current flowing through the OLED of each pixel to change, thereby affecting the whole The display of the image.
  • Embodiments of the present disclosure provide a pixel driving circuit, a driving method thereof, and a display device, which can avoid the influence of threshold voltage drift of a driving transistor on a driving current of a light emitting device, thereby improving uniformity of a display image.
  • a pixel driving circuit includes: a light emitting device, a driving module, a light emitting control module, a threshold compensation module, and an energy storage module;
  • a first pole of the energy storage module is connected to a control end of the driving module, an output end of the lighting control module, and an output end of the threshold compensation module, and a second pole of the energy storage module is connected to the Driving the driving end of the module and the first pole of the light emitting device;
  • the threshold compensation module is connected to the signal input end and the control end of the driving module, and the threshold compensation module is configured to charge the first pole of the energy storage module by the reference potential under the control of the first scan signal, in the third scan Data signal through control of the signal and the fifth scan signal Charging the second pole of the energy storage module to compensate for the threshold voltage of the driving module;
  • the illuminating control module is connected to the control end and the signal input end of the driving module; the illuminating control module is configured to input a first control signal to the control end of the driving module through the energy storage unit under the control of the second scanning signal And inputting a first level to a signal input end of the driving module under the control of the fourth scan signal;
  • the second pole of the light emitting device is input to a second level
  • the driving module is configured to input a driving signal to the light emitting device through a driving end of the driving module to drive the light emitting device to emit light under the control of the first control signal and the first level.
  • the threshold compensation module includes: a first switch unit, a third switch unit, and a fifth switch unit;
  • the first switching unit inputs a first scanning signal, the first signal end of the first switching unit inputs a reference potential, and the second signal end of the first switching unit is connected to the first pole of the energy storage module;
  • the control end of the third switch unit inputs a third scan signal, the first signal end of the third switch unit inputs a data signal, and the second signal end of the third switch unit is connected to the control end of the drive module;
  • the control terminal of the fifth switch unit inputs a fifth scan signal, the first signal end of the fifth switch unit is connected to the signal input end of the drive module, and the second signal end of the fifth switch unit is connected to the drive module The console.
  • the illumination control module includes: a second switch unit and a fourth switch unit;
  • the control end of the second switch unit inputs a second scan signal, the first signal end of the second switch unit is connected to the control end of the drive module, and the second signal end of the second switch unit is connected to the first pole of the energy storage module ;
  • the control end of the fourth switch unit inputs a fourth scan signal, the first signal end of the fourth switch unit inputs a first level, and the second signal end of the fourth switch unit is connected to a signal input end of the drive module.
  • all scan signals are input to the control terminal of the corresponding switch unit through the scan line.
  • the switching unit is a switching transistor, a gate of the switching transistor is used as a control end of the switching unit, and a source of the switching transistor is used as a A signal terminal or a second signal terminal, the drain of the switching transistor is used as a second signal terminal or a first signal terminal of the switching unit.
  • control end of the first switching unit and the control end of the third switching unit are connected to the same scan line.
  • control end of the second switching unit and the control end of the fourth switching unit are connected to the same scan line.
  • the driving module is a driving transistor, a gate of the driving transistor is used as a control end of the driving module, and a drain of the driving transistor is used as a signal input end of the driving module, the driving The source of the transistor is used as the driving end of the drive module.
  • the light emitting device comprises: an organic light emitting diode.
  • a driving method of a pixel circuit including:
  • the first pole of the energy storage module is charged by the reference potential, and the first pole of the energy storage module is charged by the data signal to compensate the threshold voltage of the driving module;
  • the first level coupling increases the potential of the first pole of the energy storage module, and the driving module outputs the driver at the first level and the first control signal outputted by the first pole of the energy storage module.
  • the drive signal drives the light emitting device to emit light.
  • the threshold compensation module includes: a first switch unit, a third switch unit, and a fifth switch unit;
  • the first stage further includes: the first signal end and the second signal end of the first switch unit are turned on, the first signal end and the second signal end of the third switch unit are turned on, and the first signal of the fifth switch unit is The terminal and the second signal end are turned on;
  • the second stage further includes: the first signal end and the second signal end of the first switching unit are turned off, the first signal end and the second signal end of the third switching unit are turned off, and the first signal end of the fifth switching unit is The second signal terminal is turned off.
  • the illumination control module includes: a second switch unit and a fourth switch unit;
  • the first stage further includes: the first signal end and the second signal end of the second switch unit are turned off, and the first signal end and the second signal end of the fourth switch unit are turned off;
  • the second stage further includes: the first signal end and the second signal end of the second switch unit are turned on, and the first signal end and the second signal end of the fourth switch unit are turned on.
  • the switching transistor when the switching unit is a switching transistor, the switching transistor includes an off state and a conducting state.
  • the driving module is a driving transistor
  • the driving transistor in the second phase, the driving transistor is in a saturated state.
  • a display device including any of the above pixel driving circuits is provided.
  • 1 is a schematic structural view of a known pixel driving circuit
  • FIG. 2 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram showing a timing state of an input signal of a pixel driving circuit according to another embodiment of the present disclosure
  • 6a is a schematic diagram of an equivalent circuit of a pixel driving circuit in a first stage according to another embodiment of the present disclosure
  • 6b is a schematic diagram of an equivalent circuit of a pixel driving circuit in a second stage according to another embodiment of the present disclosure.
  • the switching transistor and the driving transistor used in all embodiments of the present disclosure may each be a thin film transistor or a field effect transistor or other devices having the same characteristics. Since the source and drain of the switching transistor used here are symmetrical, the source and the drain are interchangeable. In the embodiment of the present disclosure, in order to distinguish the two poles of the transistor except the gate, one of the poles is referred to as a source and the other pole is referred to as a drain. According to the form in the drawing, the middle end of the switching transistor is a gate, the signal input end is a drain, and the signal output end is a source.
  • the switching transistor used in the embodiment of the present disclosure includes a P-type switching transistor and an N-type switching transistor, wherein the P-type switching transistor is turned on when the gate is at a low level, and is turned off when the gate is at a high level, and the N-type switching transistor is turned off.
  • the driving transistor includes a P type and an N type, wherein the P type driving transistor has a low level at the gate voltage (the gate voltage is less than the source voltage), And when the absolute value of the gate source voltage difference is greater than the threshold voltage, it is in an amplified state or full And a state in which the gate voltage of the N-type driving transistor is at a high level (the gate voltage is greater than the source voltage), and the absolute value of the voltage difference of the gate source is greater than the threshold voltage, and is in an amplified state or a saturated state.
  • FIG. 1 shows a schematic structural view of a known pixel driving circuit.
  • the driving current I OLED is generated by the voltage Vdata supplied from the data line acting on the saturation region of the driving transistor (DTFT). Current.
  • the driving current I OLED drives the OLED to emit light.
  • the threshold voltage (Vth) of the driving TFT of each pixel is uneven, and the threshold voltage of the driving TFT of each pixel (ie, T2 in the figure) is uneven, which results in The current flowing through the OLED at each pixel changes, thereby affecting the display effect of the entire image.
  • FIG. 2 is a schematic structural diagram of a pixel driving circuit provided in an embodiment of the present disclosure.
  • the pixel driving circuit includes a light emitting device 11, a driving module 12, a light emitting control module 13, a threshold compensation module 14, and an energy storage module 15.
  • the first pole a of the energy storage module 15 is connected to the control terminal of the driving module 12, one output of the lighting control module 13 and one output of the threshold compensation module 14.
  • the second pole b of the energy storage module 15 is connected to the driving module 12.
  • the threshold compensation module 14 is connected to the signal input terminal 2 and the control terminal 1 of the drive module 12, and the threshold compensation module 14 is also connected to the first pole a of the energy storage module 15.
  • the threshold compensation module 14 is configured to charge the first pole a of the energy storage module 15 by the reference potential under the control of the first scan signal, and pass the data signal to the energy storage module 15 under the control of the third scan signal and the fifth scan signal.
  • the second pole b is charged to compensate for the threshold voltage of the drive module 12.
  • the illumination control module 13 is connected to the control terminal 1 and the signal input terminal 2 of the drive module 12.
  • the illumination control module 13 is also connected to the first pole a of the energy storage module 15.
  • the illuminating control module 13 is configured to input a first control signal to the control end of the driving module 12 through the energy storage unit 15 under the control of the second scanning signal, and input to the signal input end of the driving module 12 under the control of the fourth scanning signal. The first level.
  • the second pole of the light emitting device 11 is input to a second level.
  • the driving module 12 is configured to input a driving signal to the light emitting device 11 through the driving end of the driving module 12 under the control of the first control signal and the first level to drive the light emitting device 11 to emit light.
  • the threshold compensation module 14 includes: a first switch unit, a third switch unit, and a fifth switch unit;
  • the first switching unit of the first switching unit inputs a first scanning signal, the first signal end of the first switching unit inputs a reference potential, the second signal end of the first switching unit is connected to the first pole a of the energy storage module 15;
  • the control end of the third switch unit inputs a third scan signal, the first signal end of the third switch unit inputs a data signal, and the second signal end of the third switch unit is connected to the control end of the drive module 12;
  • a fifth scanning signal is input to the control end of the fifth switching unit, a first signal end of the fifth switching unit is connected to a signal input end of the driving module 12, and a second signal end of the fifth switching unit is connected to the driving The control terminal of module 12.
  • FIG. 3 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure.
  • the illumination control module 13 may include a second switch unit and a fourth switch unit.
  • the control terminal 1 of the second switching unit inputs a second scanning signal
  • the first signal terminal 2 of the second switching unit is connected to the control terminal 1 of the driving module 12
  • the second signal terminal 3 of the second switching unit is connected to the energy storage module 15 One pole a.
  • the control terminal 1 of the fourth switching unit inputs a fourth scanning signal
  • the first signal terminal 2 of the fourth switching unit inputs a first level
  • the second signal terminal 3 of the fourth switching unit is connected to the signal input terminal 2 of the driving module 12.
  • all scan signals are input to the control terminal of the corresponding switch unit through the scan line.
  • the control end of the first switching unit and the control end of the third switching unit are connected to the same scan line; and/or the control end of the second switching unit and the fourth switching unit The control terminals are connected to the same scan line.
  • the control terminal of the switch unit when the control terminal of the switch unit is connected to the same scan line, the control terminal of the switch unit inputs the scan signal of the same timing.
  • the control terminals of the switch unit are respectively connected to different scan lines, the individual control of the switch unit can be realized, thereby achieving precise control of the pixel display time, ensuring the stability of the light-emitting device, and avoiding current passing through the non-light-emitting phase of the light-emitting device. Extends the life of the device.
  • each switch unit and the drive module are marked in the form of numbers 1, 2, and 3, wherein the control end of the switch unit is the terminal 1, the first letter The terminal is terminal 2, the second signal terminal is terminal 3; the control terminal of the driving module is terminal 1, the signal input terminal is terminal 2, and the driving terminal is terminal 3.
  • the pixel driving circuit of the embodiment of the present disclosure can perform threshold voltage compensation on the driving module through the threshold compensation module to avoid the influence of the threshold voltage drift of the driving module on the driving current of the light emitting device, thereby improving the uniformity of the display image.
  • the first pole of the energy storage module is charged by the reference potential, and the first pole of the energy storage module is charged by the data signal to compensate the threshold voltage of the driving module;
  • the first level coupling increases the potential of the first pole of the energy storage module
  • the driving module outputs a driving signal to drive the light at the driving end under the control of the first level and the first control signal outputted by the first pole of the energy storage module.
  • the device emits light.
  • the threshold compensation module 14 can include a first switching unit, a third switching unit, and a fifth switching unit.
  • the first signal end and the second signal end of the first switch unit are turned on, the first signal end and the second signal end of the third switch unit are turned on, and the first signal end of the fifth switch unit is turned on. And the second signal end is turned on.
  • the first signal end and the second signal end of the first switching unit are turned off, the first signal end and the second signal end of the third switching unit are turned off, and the first signal end and the fifth end of the fifth switching unit The two signal ends are cut off.
  • the lighting control module 13 may include: a second switching unit and a fourth switching unit;
  • the first signal end and the second signal end of the second switching unit are turned off, and the first signal end and the second signal end of the fourth switching unit are turned off.
  • the first signal end and the second signal end of the second switching unit are turned on, and the first signal end and the second signal end of the fourth switching unit are turned on.
  • the driving method of the pixel driving circuit provided by the embodiment of the present disclosure can perform threshold voltage compensation on the driving module by the threshold compensation module to avoid the influence of the threshold voltage drift of the driving module on the driving current of the light emitting device, thereby improving the uniformity of the display image. Sex.
  • the switching unit is a switching transistor
  • the driving module is a driving transistor
  • the light emitting device is an OLED
  • the energy storage module is a storage capacitor as an example.
  • the gate of the switching transistor is used as The control terminal of the switching unit
  • the source of the switching transistor is used as the first signal terminal or the second signal terminal of the switching unit
  • the drain of the switching transistor is used as the second signal terminal or the first signal terminal of the switching unit.
  • the gate of the driving transistor is used as a control terminal of the driving module
  • the source of the driving transistor is used as a signal input terminal of the driving module
  • the drain of the driving transistor is used as a driving terminal of the driving module.
  • FIG. 4 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure.
  • the pixel driving circuit includes: five switching transistors (T1-T5), a light emitting device OLED, and a driving transistor DTFT and a storage capacitor C1, wherein the storage capacitor includes a first pole (node a) and a second Pole (node b). All the transistors in the circuit are exemplified by a P-type transistor, wherein the first level is a high level VDD, the second level is a low level VSS, and the first scan line Vscan provides a scan signal for the gates of T1 and T3.
  • the second scan line CR1 provides a scan signal for the gates of T2 and T4; CR2 provides a scan signal for the gate of T5, the data line Vdata provides a data signal for the drain of T3, and Vref provides a reference potential for the drain of T1, VDD And VSS provide power for the light emitting device OLED.
  • the gate of T1 is input to Vscan, the drain of T1 is input to Vref, the source of T1 is connected to node a; the gate of T2 is connected to CR1, the source of T2 is connected to node a, and the drain of T2 is connected.
  • the gate of DTFT is connected; the drain of T3 is connected to Vdata, the gate of T3 is connected to Vscan, the source of T3 is connected to the source of T5; the drain of T4 is input to VDD, the gate of T4 is connected to CR1, and the source of T4 is connected to DTFT.
  • the drain of T5 is connected to the source of T4, the gate of T5 is connected to CR2, the gate of DTFT is connected to the drain of T2, the source of DTFT is connected to the first pole of OLED, and the second pole of OLED is input to VSS.
  • the OLED is a bottom emission type OLED, and exemplarily, VSS is a ground.
  • FIG. 5 is a schematic diagram showing a timing state of an input signal of a pixel driving circuit provided in still another embodiment of the present disclosure.
  • 6a and 6b respectively show equivalent circuit diagrams of the pixel driving circuit provided in another embodiment of the present disclosure in the first stage and the second stage.
  • FIG. 4 referring to the signal timing state diagram of each input signal of the pixel driving circuit provided in FIG. 5, and referring to the equivalent circuit schematic diagram of the working states of the respective stages of the pixel driving circuit provided in FIGS. 6a and 6b, An example of how this circuit works is as follows:
  • the first phase t1 shown in Figure 5 is a pixel drive voltage compensation phase.
  • Vscan and CR2 are at a high level, and T1, T3 and T5 are turned on, so the data line high level signal Vdata is written to the gate of the DTFT. With the drain.
  • Vref is written to the left end node a of the storage capacitor C1 through T1. Since CR1 is low, T2 and T4 are turned off. Since Vdata is simultaneously written to the gate and drain of the DTFT, the DTFT is equivalent to a PN junction.
  • VSS is higher than the highest gray scale driving voltage of the OLED, so that the OLED is not turned on, so as to avoid display errors.
  • Vref-Vdata+Vth the voltage difference across the storage capacitor C1
  • C the amount of charge stored on the capacitor C1
  • the second phase t2 shown in Figure 5 is the OLED display phase.
  • Vscan and CR2 are at a low level, so T1, T3, and T5 are turned off, and since CR1 is at a high level, T2 and T4 are turned on. Due to the conduction of T4 and the charge retention of the storage capacitor C1, the DTFT continues to conduct. At this time, the OLED is turned on. When the stabilization phase is reached, the OLED has a stable voltage drop Voled, and the voltage of the right node b of the capacitor C1. For: Voled+Vss.
  • the voltage of the left node a of capacitor C1 is: Vref-Vdata+Vth+Voled+Vss, but the gate and source voltage of DTFT are maintained as: Vref-Vdata+ Vth. Therefore, the current Ioled that the DTFT conducts through the OLED is:
  • ⁇ is the carrier mobility of the DTFT
  • Cox is the capacitance of the gate insulating layer of the DTFT
  • W/L is the aspect ratio of the DTFT.
  • the threshold voltage of the driving TFT of the OLED can be effectively compensated, the influence of the threshold voltage drift of the driving TFT on the brightness of the OLED is eliminated, and the display effect of the OLED panel is improved.
  • This design is well suited for industrial design due to the use of fewer TFTs and capacitors.
  • the switching transistor and the driving transistor are “P” type transistors.
  • the embodiment of the present disclosure does not limit the types of the respective switching transistors and driving transistors provided.
  • the types of the respective switching transistors and the driving transistors are changed, it is only necessary to adjust the level signal applied by the gate of the transistor.
  • the driving method of the pixel circuit provided by the embodiment of the present disclosure is accurate. Any combination that can be easily conceived and realized by those skilled in the art based on the pixel driving circuit and the driving method provided by the embodiments of the present disclosure is within the protection scope of the present disclosure.
  • turn-off The off state of a transistor in the art is also referred to as turn-off, turn-off, etc., and turn-on is also referred to as turn-on or the like.
  • turn-on is also referred to as turn-on or the like.
  • cut-off and conduction in the present application, and other forms of expression or modification are also within the scope of protection of the present application.
  • An embodiment of the present disclosure provides a display device including the above pixel driving circuit.
  • the display device can be a display device such as an electronic paper, a mobile phone, a television, a digital photo frame, or the like.
  • the display device provided by the embodiment of the present disclosure can perform threshold voltage compensation on the driving module through the threshold compensation module to avoid the influence of the threshold voltage drift of the driving module on the driving current of the light emitting device, thereby improving the uniformity of the display 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)
  • Control Of El Displays (AREA)

Abstract

L'invention concerne un circuit d'excitation de pixels, un procédé d'excitation de pixels et un appareil d'affichage. Le circuit d'excitation de pixels comprend un dispositif d'émission de lumière (11), un module d'excitation (12), un module de commande d'émission de lumière (13), un module de compensation de seuil (14) et un module de stockage d'énergie (15). Le module de compensation de seuil (14) charge une première électrode (a) du module de stockage d'énergie (15) par l'intermédiaire d'un potentiel de référence sous la commande d'un premier signal de balayage, et charge une seconde électrode (b) du module de stockage d'énergie (15) par l'intermédiaire d'un signal de données sous la commande d'un troisième signal de balayage et d'un cinquième signal de balayage de manière à compenser une tension de seuil du module d'excitation (12). Le module de commande d'émission de lumière (13) entre un premier signal de commande dans une extrémité de commande du module d'excitation (12) par l'intermédiaire du module de stockage d'énergie (15) sous la commande d'un deuxième signal de balayage et entre un premier niveau dans une extrémité d'entrée de signaux du module d'excitation (12) sous la commande d'un quatrième signal de balayage. Le module d'excitation (12) entre un signal d'excitation dans le dispositif d'émission de lumière (11) sous la commande du premier signal de commande et du premier niveau de manière à exciter le dispositif d'émission de lumière (11) afin qu'il émette une lumière. Le circuit d'excitation de pixels permet d'éviter l'influence d'une dérive d'une tension de seuil du module d'excitation (12) sur le courant d'excitation du dispositif d'émission de lumière (11), ce qui améliore l'uniformité d'une image d'affichage.
PCT/CN2014/093769 2014-08-15 2014-12-13 Circuit d'excitation de pixels, procédé d'excitation de pixels et appareil d'affichage WO2016023311A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410404104.9A CN104157241A (zh) 2014-08-15 2014-08-15 一种像素驱动电路及其驱动方法和显示装置
CN201410404104.9 2014-08-15

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