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WO2015167227A1 - Appareil et procédé de compensation d'écart de luminosité de dispositif d'affichage électroluminescent organique - Google Patents

Appareil et procédé de compensation d'écart de luminosité de dispositif d'affichage électroluminescent organique Download PDF

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Publication number
WO2015167227A1
WO2015167227A1 PCT/KR2015/004265 KR2015004265W WO2015167227A1 WO 2015167227 A1 WO2015167227 A1 WO 2015167227A1 KR 2015004265 W KR2015004265 W KR 2015004265W WO 2015167227 A1 WO2015167227 A1 WO 2015167227A1
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Prior art keywords
transistor
capacitor
driving transistor
voltage
light emitting
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English (en)
Korean (ko)
Inventor
이정철
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NeoView Kolon Co Ltd
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NeoView Kolon Co Ltd
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Priority claimed from KR1020140052771A external-priority patent/KR20150125413A/ko
Priority claimed from KR1020140052783A external-priority patent/KR20150125419A/ko
Priority claimed from KR1020140052761A external-priority patent/KR20150125408A/ko
Application filed by NeoView Kolon Co Ltd filed Critical NeoView Kolon Co Ltd
Publication of WO2015167227A1 publication Critical patent/WO2015167227A1/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 a luminance deviation compensation device and a compensation method of an organic light emitting display device, and more particularly, to a luminance deviation compensation device and a compensation method of an organic light emitting display device using an organic light emitting device as a pixel display element of the display device.
  • an organic light emitting display device using an organic light emitting device (hereinafter referred to as an organic EL device) as a pixel of a display device has been in the spotlight, and an organic light emitting display device using the organic EL device as a light emitting device is light and thin. It is attracting attention as a next-generation flat panel display because of excellent luminance and viewing angle characteristics compared to other display devices.
  • the organic EL device has a structure in which an organic light emitting layer containing an organic compound is inserted between a pair of electrodes formed of a positive electrode and a negative electrode formed on a transparent substrate such as glass, and holes are formed in the organic light emitting layer from the pair of electrodes. It is a light emitting device that generates an exciton by injecting and recombining holes and electrons, and displays or the like by utilizing the emission of light when the activity of the excitons is lost.
  • the organic light emitting layer is a thin film layer made of an organic material, the conversion efficiency of converting the color and current of light emitted into light is determined by the composition of the organic material forming the organic light emitting layer, different organic materials are different colors Generates light.
  • the organic material deteriorates and the luminous efficiency is lowered, thereby shortening the life of the display device.
  • different organic materials may deteriorate at different rates depending on the color of light emitted, and a difference also occurs in deterioration of color.
  • the plurality of pixels constituting the display device cannot be deteriorated at the same speed as the other pixels, and the difference in the speed of the deterioration leads to uneven display.
  • the causes of such deterioration include an increase in the resistance value of the device itself and a decrease in luminous efficiency due to prolonged use of the display device.
  • the organic EL element has a characteristic that the resistance value of the element gradually increases when it emits light for a long time, and since the organic EL elements constituting the display device have different light emission frequencies, the cumulative emission time is inevitably different. Therefore, when the display device is driven for a long time, a variation in resistance value occurs between the organic EL elements, and thus a variation in emission luminance occurs, resulting in a luminance mura or a ghost image of the entire screen. have.
  • Another cause of deterioration is a decrease in the intensity of the light emitted from the organic EL element due to an increase in the threshold voltage due to deterioration of the thin film transistor (TFT) constituting the pixel, especially the driving transistor, over time.
  • the increase in voltage also varies among the plurality of transistors in the display device.
  • Patent Document 1 There is a technique described in Patent Document 1 as a technique for solving the problem of deterioration caused by the use of such a display device for a long time.
  • FIG. 1 is a circuit diagram showing a configuration of a display device driving circuit of Patent Document 1.
  • a conventional display device driving circuit has a pixel circuit 60 composed of a selection transistor 90, a driving transistor 70, and an organic EL element 50, as shown in FIG. And a first switch S1 for selectively connecting the first voltage source 14 to the first electrode of the driving transistor 70, and an organic EL element having an anode connected to the second electrode of the driving transistor 70. 50, a second voltage source 15, and a second switch S2 for selectively connecting the cathode of the organic EL element 50 to the second voltage source 15.
  • the first electrode is connected to the second electrode of the drive transistor 70, the readout transistor 80, the current source 16, and the current source 16 to the second electrode of the readout transistor 80.
  • a third switch S3 selectively connected, a current sink 17, a fourth switch S4 selectively connecting the current sink 17 to the second electrode of the readout transistor 80, and a driving transistor And a voltage measuring circuit 18 connected to the second electrode of the readout transistor 80 to measure the voltage when the test voltage is applied to the gate electrode of 70.
  • the voltage measuring circuit 18 includes an A / D converter 18a for converting the measured voltage value into a digital signal, a processor 18b, and a memory 18c for storing the measured voltage value. Through the second electrode of the plurality of read out transistors 80, the voltage Vout from the pixel circuit 60 is sequentially read.
  • the processor 18b is connected to a data line of the pixel circuit 60 through a D / A converter 18e that converts a digital signal into an analog signal and provides a predetermined data value to the data line.
  • the processor 18b receives the display data Data input from the input terminal and compensates for the change described later, thereby providing the compensation data to the data line.
  • the first switch S1 and the fourth switch S4 are closed, the second switch S2 and the third switch S3 are opened, and the readout transistor 80 is formed using the voltage measuring circuit 18.
  • the first signal V1 indicative of the characteristics of the driving transistor 70 is obtained by measuring the voltage at the second electrode.
  • the first signal is measured for each pixel of the entire plurality of pixels of the display device.
  • the first signal V1 is measured once before using the pixel circuit 60 as a display device, i.e., before the drive transistor deteriorates due to use, and stores it as a first target signal in the memory 195. After that, after deterioration using the display device for a previously transmitted time, the first signal is measured in the same manner as described above and stored in the memory 18c.
  • the first switch S1 and the fourth switch S4 are opened, the second switch S2 and the third switch S3 are closed, and the readout transistor (using the voltage measuring circuit 18) is used.
  • the readout transistor using the voltage measuring circuit 18.
  • the second signal V2 is measured for each pixel of all the pixels constituting the display device.
  • the organic EL element 50 deteriorates before use of the display device, that is, by use.
  • the respective measurements are stored in the memory 18c.
  • the change in the characteristics of the driving circuit is compensated for by using the change in the first signal and the change in the second signal.
  • Patent Literature 2 calculates a correction signal for each organic EL element and a voltage sensing circuit including a transistor for sensing a voltage on one surface of each organic EL element of the organic light emitting display and generating a feedback signal. DESCRIPTION OF RELATED ART The display apparatus which compensates the output change of each organic EL element by applying the correction signal to the data which drives each organic EL element is described.
  • the conventional organic light emitting display devices of Patent Documents 1 and 2 compensate for the variation in the light emission luminance of the display device by comparing the characteristic values of the driving transistor and / or the organic EL element before and after degradation.
  • Patent Documents 1 and 2 shows a difference between the characteristic values of the transistor and / or the organic EL device before and after deterioration. Compensation for the luminance deviation by use, and there is a considerable time difference between the measurement time before deterioration and after deterioration, and in the meantime, the decrease in the emission luminance of the organic light emitting display device is continuously performed.
  • Technology lacks instantaneous compensation for deterioration.
  • Patent Document 2 does not consider the deterioration of the driving transistor, which is one of the causes of the deterioration of characteristics due to the use of the display device, and therefore, the problem that the problem of deterioration of performance due to long use of the display device cannot be completely solved. have.
  • Patent Document 1 WO2009 / 002468 Publication Pamphlet
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2007-514966
  • the present invention has been made in view of the above-mentioned problems, and the threshold voltage of the driving transistors constituting each pixel of the organic light emitting display device is measured in advance every time the driving transistor emits light, and the voltage reflecting the measured value is applied to the driving transistor to emit light. It is an object of the present invention to provide a luminance deviation compensation device and a compensation method of an organic light emitting display device which can emit light at a constant luminance regardless of the elapse of the use time of the display device.
  • the luminance deviation compensator of the display device of the present invention for solving the above problems comprises a plurality of pixel circuits disposed in an area where a plurality of gate lines for supplying a scan signal and a plurality of data lines for supplying an image signal intersect.
  • each of the plurality of pixel circuits includes: a light emitting device, a driving transistor for controlling a current flowing through the light emitting device in response to an image signal applied through the data line; A switching transistor connected between a gate electrode of a driving transistor and the data line via a second capacitor and having a conductive state controlled according to the scan signal, and connected between the switching transistor and a first voltage source to correspond to the image signal A first capacitor charging a voltage to and one end of the first capacitor A second capacitor connected between the gate electrodes of the driving transistor to charge the threshold voltage of the driving transistor, wherein the driving transistor is connected to a total voltage of the voltage charged in the first capacitor and the voltage charged in the second capacitor. A corresponding current is applied to the light emitting element.
  • the luminance deviation compensation device of the display device of another embodiment of the present invention for solving the above-mentioned problems is respectively provided in each intersection area where a plurality of gate lines for supplying a scan signal and a plurality of data lines for supplying an image signal cross each other.
  • the luminance deviation compensator of the display apparatus of another form of this invention for solving the said subject is arrange
  • a capacitor configured to be connected between the driving transistor, a switching transistor whose conduction state is controlled according to the scan signal, and a voltage corresponding to the threshold voltage of the driving transistor and a voltage corresponding to the image signal by being connected between the switching transistor and the gate electrode of the driving transistor.
  • the drive transistor is charged in the capacitor Is applied to the light emitting element wherein an electric current corresponding to the sum voltage of the voltage corresponding to the threshold voltage of that transistor and the picture signal.
  • the luminance deviation compensation method of the present invention for solving the above problems comprises a plurality of pixel circuits arranged in an area where a plurality of gate lines for supplying a scan signal and a plurality of data lines for supplying an image signal intersect.
  • each of the plurality of pixel circuits includes a light emitting element, a driving transistor for controlling a current flowing through the light emitting element in response to an image signal applied through the data line, and the driving.
  • a switching transistor connected between a gate electrode of the transistor and the data line via a second capacitor, the conducting state being controlled according to the scan signal, and connected between the switching transistor and the first voltage source to correspond to the image signal.
  • a method for compensating for luminance deviation wherein a plurality of gate lines for supplying a scan signal and a plurality of data lines for supplying an image signal intersect each other.
  • a first switching transistor connected between the first switching transistor and a conductive state controlled according to the scan signal, and a gate electrode of the driving transistor and the data line via a second capacitor, and the conductive state controlled according to the scan signal.
  • the luminance deviation compensation method comprises: driving the transistor; Vaporizing, charging a threshold voltage of the driving transistor to the second capacitor, charging a voltage corresponding to the image signal to the first capacitor, and charging the first capacitor and the second capacitor. And applying a current corresponding to the total voltage of the charged voltage to the light emitting device.
  • a luminance deviation compensation method comprising: a plurality of pixels arranged in an area where a plurality of gate lines supplying a scan signal and a plurality of data lines supplying an image signal intersect.
  • the luminance deviation compensation method initializes the driving transistor. And charging the capacitor with a threshold voltage of the driving transistor, charging the capacitor with a voltage corresponding to the image signal, threshold voltage and the image signal of the driving transistor charged with the capacitor. And applying a current corresponding to the total voltage of the voltage corresponding to the light emitting device.
  • each pixel circuit detects the threshold voltage of the driving transistor prior to the light emission every time the organic EL element emits light, and the current corresponding to the total voltage obtained by adding the voltage corresponding to the detected threshold voltage to the image signal.
  • the light emitting device can always emit light at an appropriate brightness regardless of the deterioration caused by the long time use of the driving transistor, and at the same time, it is possible to compensate for the threshold voltage variation of the driving transistor in real time.
  • the first capacitor is stored in the second capacitor when the threshold voltage of the driving transistor is stored. It is not affected by the capacitor, and the threshold voltages of the image signal and the driving transistor can be stored accurately in the first capacitor and the second capacitor, respectively.
  • 1 is a circuit diagram showing a configuration of a conventional display device driving circuit
  • FIG. 2 is a diagram schematically showing a configuration of a display device of a preferred embodiment of the present invention
  • FIG. 3 is a circuit diagram schematically showing the configuration of a pixel circuit of the display device of preferred embodiment 1 of the present invention
  • FIG. 4 is a timing diagram showing an operation timing of a pixel circuit according to the first embodiment
  • FIG. 5 is a view showing the operation of the pixel circuit during the organic EL element initialization operation according to the first embodiment
  • FIG. 6 is a view showing the operation of the pixel circuit when detecting the threshold voltage of the driving transistor of Embodiment 1;
  • FIG. 7 is a view showing the operation of the pixel circuit when the scan signal is applied in the first embodiment
  • FIG. 8 is a view showing the operation of the pixel circuit when the organic EL element of Embodiment 1 is turned on;
  • FIG. 9 is a circuit diagram schematically showing the configuration of a pixel circuit of the display device of preferred embodiment 2 of the present invention.
  • FIG. 10 is a timing chart showing the operation timing of the pixel circuit of Embodiment 2;
  • FIG. 11 is a view showing the operation of the pixel circuit during the organic EL element initialization operation according to the second embodiment
  • FIG. 12 is a view showing the operation of the pixel circuit at the time of detecting the threshold voltage of the drive transistor of Embodiment 2;
  • FIG. 13 is a view showing the operation of the pixel circuit when the scan signal is applied in the second embodiment
  • FIG. 14 is a view showing the operation of the pixel circuit when the organic EL element is turned on in Embodiment 2;
  • FIG. 15 is a circuit diagram schematically showing the configuration of a pixel circuit of the display device of Embodiment 3 of the present invention.
  • 16 is a timing diagram showing an operation timing of a pixel circuit according to the third embodiment.
  • 17 is a view showing the operation of the pixel circuit in the organic EL element initialization operation according to the third embodiment
  • FIG. 18 is a view showing the operation of the pixel circuit at the time of detecting the threshold voltage of the drive transistor of Embodiment 3;
  • 19 is a diagram illustrating the operation of the pixel circuit when the scan signal is applied in the third embodiment.
  • FIG. 2 is a diagram schematically showing a configuration of an organic light emitting display device (hereinafter, sometimes referred to as a "display device" for simplicity) of a preferred embodiment 1 of the present invention.
  • a display device an organic light emitting display device
  • the display device of the first embodiment includes a display unit 100, a gate driver 200, a data driver 300, an anode driver 400, and a controller 500.
  • the display unit 100 is arranged in parallel with each other, and includes a plurality of gate lines S1 to Sn that supply a row selection signal SCAN for selecting one of a plurality of rows, and the gate lines S1 to Sn. And a plurality of data lines D1 to Dm for supplying an image signal Vdata to a selected pixel circuit and a plurality of anode lines E1 to En for supplying a light emission signal to a selected pixel circuit.
  • the plurality of gate lines S1 to Sn and the plurality of anode lines E1 to En are arranged in parallel with each other.
  • a plurality of pixel circuits Px10 are arranged in a matrix at each intersection where the plurality of gate lines S1 to Sn and the plurality of data lines D1 to Dm intersect.
  • the gate driver 200 is connected to the gate lines S1 to Sn of the display unit 100, and sequentially selects the row selection signals to the gate lines S1 to Sn according to the scan control signal CONT1 supplied from the controller 500. (SCAN, scan signal) is applied.
  • the data driver 300 is connected to each of the data lines D1 to Dm of the display unit 100, and according to the data control signal CONT2 supplied from the controller 500, the image data signal input from the controller 500 ( The image signal Vdata corresponding to D) is generated and sequentially applied to each data line D1 to Dm.
  • the anode driver 400 is connected to each of the anode lines E1 to En of the display unit 100, and sequentially emits the emission signals to the anode lines E1 to En according to the emission control signal CONT3 supplied from the controller 500. Is authorized.
  • the controller 500 receives an input signal IS, a horizontal sync signal Hsync, a vertical sync signal Vsync, and a main clock signal MCLK from an external source, thereby receiving an image data signal D, a scan control signal CONT1,
  • the data control signal CONT2 and the light emission control signal CONT3 are generated and applied to the gate driver 200, the data driver 300, and the anode driver 400, respectively.
  • 3 is a circuit diagram schematically showing the configuration of a pixel circuit Px10 of the display portion 100 of the display device of preferred embodiment 1 of the present invention.
  • the pixel circuit Px10 of the first embodiment includes the organic EL element OLED, the switching transistor TR11, the first setting transistor TR12, the second setting transistor TR13, and emission control. Five transistors of the transistor TR14 and the driving transistor D-TR10 and two capacitors of the first capacitor C11 and the second capacitor C12 are provided.
  • Each transistor TR11, TR12, TR13, TR14, D-TR10 has a first electrode, a second electrode, and a gate electrode.
  • the switching transistor TR11 has a gate electrode connected to a gate driver (gate driver 200 of FIG. 2), not shown, through a gate line, and the first electrode is connected to a data driver (data of FIG. 2) through a data line.
  • the second electrode is connected to one end of the first capacitor C11 and one end of the second capacitor C12 and to the first electrode of the second setting transistor TR13.
  • One end of the first capacitor C11 is connected to the second electrode of the switching transistor TR11, the first electrode of the second setting transistor TR13, and one end of the second capacitor C12, and the other end thereof is connected to the first voltage source ( VDD) and the first electrode of the driving transistor D-TR10.
  • One end of the second capacitor C12 is connected to the second electrode of the switching transistor TR11, the first electrode of the second setting transistor TR13, and one end of the first capacitor C11, and the other end thereof is the driving transistor D-. It is connected to the gate electrode of TR10 and the second electrode of first setting transistor TR12.
  • the switching transistor TR11 having such a connection relationship is driven by the scan signal SCAN (row selection signal) applied from the gate driver to convert a voltage corresponding to the image signal Vdata applied from the data driver to the first capacitor C11. )
  • the gate electrode of the driving transistor D-TR10 is connected to the second electrode of the switching transistor TR11 and the first electrode of the second setting transistor TR13 via the second capacitor C12 and at the same time the first setting transistor (
  • a first electrode is connected to the other end of the first voltage source VDD and the first capacitor C11, and the second electrode is connected to the organic EL element via the light emission control transistor TR14. It is connected to the anode end of the (OLED) and at the same time as the second electrode of the second setting transistor TR13.
  • the driving transistors D-TR10 connected as described above are the total voltage Vdata + of the voltage corresponding to the image signal Vdata and the threshold voltage Vth of the driving transistor D-TR10 charged in the second capacitor C12.
  • a current corresponding to Vth flows from the first voltage source VDD to the organic EL element OLED, and the organic EL element OLED emits light at a luminance corresponding to this current.
  • the first setting transistor TR12 has a gate electrode connected to a controller (not shown), a first electrode connected to a reference voltage source Vref, and a second electrode connected to the other end of the second capacitor C12 and the driving transistor D. -TR10 is connected to the gate electrode.
  • the second setting transistor TR13 has a gate electrode connected to a controller (not shown), and the first electrode is connected to a second electrode of the switching transistor TR11 and one end of the first capacitor C11 and the second capacitor C12. The second electrode is connected to the second electrode of the driving transistor D-TR10 and the first electrode of the emission control transistor TR14.
  • the light emission control transistor TR14 has a gate electrode connected to a controller (not shown), a first electrode connected to a second electrode of a driving transistor D-TR10 and a second setting transistor TR13, and a second electrode of the light emitting control transistor TR14. It is connected to the anode end of the EL element OLED.
  • the first setting transistor TR12, the second setting transistor TR13, and the light emission control transistor TR14 operate when the threshold voltage Vth of the driving transistor D-TR10 is detected. Details thereof will be described later.
  • the organic EL device OLED has an anode terminal connected to the first voltage source VDD through the light emission control transistor TR14 and the driving transistor D-TR10, and a cathode terminal connected to the second voltage source VSS.
  • the light emission control transistor TR14 When the light emission control transistor TR14 is turned on, light is emitted under the control of the driving transistor D-TR10.
  • the control unit connected to the gate electrodes of the first setting transistor TR12, the second setting transistor TR13, and the light emission control transistor TR14 is a control unit for controlling the overall operation of the organic light emitting display device including a gate driver and a data driver (FIG.
  • the control part 500 of 2 may also function as the function, and may be set as an independent control part from the control part 500 of FIG.
  • FIG. 4 is a timing diagram showing an operation timing of the pixel circuit Px10 of the first embodiment
  • FIG. 5 is a diagram showing an operation of the pixel circuit Px10 during the organic EL element OLED initialization operation of the first embodiment
  • FIG. 7 is a diagram showing the operation of the pixel circuit Px10 at the time of detecting the threshold voltage of the driving transistor TR12 of the first embodiment
  • FIG. 7 shows the operation of the pixel circuit Px10 when the scan signal SCAN is applied in the first embodiment.
  • FIG. 8 is a diagram showing the operation of the pixel circuit when the organic EL element of the first embodiment is turned on.
  • size of the voltage applied to each part in this Embodiment 1 is [the voltage of the 1st voltage source VDD> the voltage of the reference voltage source Vref> the maximum voltage Vdata MAX of the image signal Vdata> Voltage of the second voltage source VSS + threshold voltage V OLED_Vth of the organic EL element OLED.
  • the controller selects the gate electrode of the second setting transistor TR13 while the light emission control transistor TR14 is ON.
  • the second setting transistor TR13 is turned on at a high level
  • the gate electrode of the first setting transistor TR12 is turned at a high level to turn the first setting transistor TR12 on.
  • the driving transistor D-TR10 is initialized (see FIG. 5).
  • the light emitting control transistor TR14 is turned off and driven.
  • the second electrode (node N13) of the transistor D-TR10 is in a floating state and the voltage of the node N13 rises to the threshold voltage Vth of the driving transistor D-TR10.
  • the gate voltage INIT of the second setting transistor TR13 is set at low level
  • the second setting transistor TR13 is turned off
  • the gate voltage REF of the first setting transistor TR12 is set at low level.
  • the second capacitor C12 has a voltage between the gate electrode of the driving transistor D-TR10 and the second electrode, that is, the threshold voltage of the driving transistor D-TR10. The voltage corresponding to Vth is charged (see FIG. 6).
  • the switching transistor TR11 when the image signal Vdata is applied from the data driver to the first electrode of the switching transistor TR11 and the scan signal SCAN is applied to the gate electrode in the period t3 of one frame period of FIG. 4, the switching transistor TR11. Is activated, a voltage corresponding to the image signal Vdata is applied to the second electrode (node N12), and a voltage corresponding to the image signal Vdata is charged in the first capacitor C11 and the driving transistor D- The total voltage Vdata of the voltage corresponding to the voltage corresponding to the image signal Vdata and the threshold voltage Vth of the driving transistor D-TR10 charged in the second capacitor C12 is applied to the node N11 which is the gate electrode of TR10. + Vth) is applied (see FIG. 7).
  • the switching transistor TR11 is turned off while the scan signal SCAN applied to the gate electrode of the switching transistor TR11 is set at the low level in the period t4 of one frame period of FIG. Sets the light emission control transistor TR14 to the ON state, the voltage corresponding to the image signal Vdata charged in the first capacitor C11 and the threshold voltage of the driving transistor D-TR10 stored in the second capacitor C12.
  • the voltage corresponding to Vth is added up, and the summed total voltage Vdata + Vth is applied to the gate electrode (node N11) of the driving transistor D-TR10, and the driving transistor D-TR10 is supplied with this total voltage ( A current corresponding to Vdata + Vth flows from the first voltage source VDD to the organic EL element OLED, and the organic EL element OLED emits light at a luminance corresponding to the magnitude of this current (see FIG. 8). .
  • each pixel circuit Px10 repeats the above operation in units of each frame period.
  • each of the plurality of pixel circuits includes the gate driver 200 and the data driver under the control of the controller 500.
  • OLED organic EL element
  • each pixel circuit Px10 detects the threshold voltage Vth of the driving transistor D-TR10 prior to the light emission every time the organic EL element OLED emits light, and detects the detected threshold voltage ( The current corresponding to the total voltage obtained by adding the voltage corresponding to Vth) to the image signal Vdata is passed through the organic EL device OLED, so that the light emitting device is independent of deterioration due to prolonged use of the driving transistor D-TR10.
  • the organic EL device OLED can always emit light at an appropriate luminance, and real-time compensation can be made for the variation of the threshold voltage Vth of the driving transistor D-TR10.
  • a separate external circuit or device for measuring and calculating the threshold voltage Vth of the driving transistor D-TR10 is not required as in the prior art, and in particular, a separate memory for storing the variation value of the threshold voltage Vth. It is possible to reduce the cost because it does not require.
  • the overall configuration of the organic light emitting display device is the same as that of the organic light emitting display device of Embodiment 1 described with reference to FIG. different.
  • FIG. 9 is a circuit diagram schematically showing the configuration of a pixel circuit Px20 of the display portion 100 of the display device of preferred embodiment 2 of the present invention.
  • the pixel circuit Px20 of the second embodiment includes an organic EL element OLED, a first switching transistor TR21, a second switching transistor TR22, a driving transistor D-TR20, and the like. Seven transistors of the light emission control transistor TR23, the first setting transistor TR24, the second setting transistor TR25, and the initialization transistor TR26, and two of the first capacitor C21 and the second capacitor C22. With a capacitor.
  • Each transistor TR21, TR22, TR23, TR24, TR25, TR26, D-TR20 has a first electrode, a second electrode, and a gate electrode.
  • the first switching transistor TR21 has a gate electrode connected to a gate driver (gate driver 200 of FIG. 2) not shown through a gate line, and the first electrode is connected to a data driver (not shown) through a data line (FIG. 2). Is connected to one end of the first capacitor C21 and at the same time as the first electrode of the light emission control transistor TR23.
  • the second switching transistor TR22 has a gate electrode connected to a gate driver (gate driver 200 of FIG. 2), not shown, through a gate line SCAN, and the first electrode is not shown, through a data line DATA. 2 is connected to one end of the second capacitor C22, and the first electrode and the light emission control transistor TR23 of the first setting transistor TR24. Is connected to the second electrode.
  • One end of the first capacitor C21 is connected to the second electrode of the first switching transistor TR21 and the first electrode of the light emission control transistor TR23, and the other end thereof is the first voltage source VDD and the driving transistor D-.
  • One end of the second capacitor C22 is connected to the second electrode of the second switching transistor TR22 and the light emission control transistor TR23, and at the same time the first electrode of the first setting transistor TR24 One electrode is connected, and the other end is connected to the gate electrode of the driving transistor D-TR20 and the second electrode of the second setting transistor TR25.
  • the light emission control transistor TR23 has a gate electrode connected to a control unit (not shown), a first electrode connected to a second electrode of the first switching transistor TR21, and one end of the first capacitor C21, and the second electrode
  • the second electrode of the second switching transistor TR22 and the first electrode of the first setting transistor TR24 are connected to one end of the second capacitor C22.
  • the first switching transistor TR21 having such a connection relationship is driven by a row selection signal (scanning signal) applied from the gate driver to convert a voltage corresponding to the image signal Vdata applied from the data driver to the first capacitor C21.
  • the second switching transistor TR22 is driven by the scan signal (row selection signal) applied from the gate driver to charge the image signal Vdata applied from the data driver and the second capacitor C22 described later.
  • the driving voltage of the driving transistor D-TR20 is applied to the gate electrode of the driving transistor D-TR20 by applying the total voltage of the threshold voltage Vth of the driving transistor D-TR20.
  • the driving voltage SET2 applied from a control unit (not shown)
  • the voltages corresponding to the image signal Vdata charged in the first capacitor C21 are stored at the nodes N22 and N24.
  • the voltage corresponding to the image signal Vdata and the total voltage Vdata + Vth of the threshold voltage Vth of the driving transistor D-TR20 charged in the second capacitor C22 are applied to the node N21. .
  • the gate electrode of the driving transistor D-TR20 has a second electrode of the second switching transistor TR22, a second electrode of the light emission control transistor TR23, and a first setting transistor TR24 via the second capacitor C22.
  • a first electrode of which is connected to the other end of the first voltage source VDD and the first capacitor C21, and a second electrode of which is connected to the anode end of the organic EL element OLED.
  • the second electrode of the setting transistor TR24 and the first electrode of the initialization transistor TR26 are connected to each other.
  • the driving transistors D-TR20 connected as described above have a total voltage Vdata + of a voltage corresponding to the image signal Vdata and a threshold voltage Vth of the driving transistor D-TR20 charged in the second capacitor C22.
  • a current corresponding to Vth flows from the first voltage source VDD to the organic EL element OLED, and the organic EL element OLED emits light at a luminance corresponding to this current.
  • the first setting transistor TR24 has a gate electrode connected to a controller (not shown), and the first electrode is connected to a second electrode of the second switching transistor TR22 and the light emission control transistor TR23, and at the same time, the second capacitor C22 The second electrode is connected to the second electrode of the driving transistor D-TR20 and the first electrode of the initialization transistor TR26 and to the anode end of the organic EL element OLED.
  • the second setting transistor TR25 has a gate electrode connected to a controller (not shown), a first electrode connected to a reference voltage source VREF, and a second electrode connected to the other end of the second capacitor C22 and the driving transistor D. -TR20 is connected to the gate electrode.
  • the initialization transistor TR26 has a gate electrode connected to a controller (not shown), a first electrode connected to a second electrode of the first setting transistor TR24 and the driving transistor D-TR20, and an organic EL element OLED. Is connected to an anode end of the second electrode, and the second electrode is connected to an initialization voltage source Vinit.
  • the first setting transistor TR24, the second setting transistor TR25, and the initialization transistor TR26 operate at the detection of the threshold voltage Vth of the driving transistor D-TR20, and will be described later in detail.
  • Control unit connected to the gate electrodes of the light emission control transistor TR23, the first setting transistor TR24, the second setting transistor TR25, and the initialization transistor TR26 operates the overall operation of the organic light emitting display device including a gate driver and a data driver.
  • Control unit (control unit 500 in FIG. 2) may serve as a function, or may be a separate control unit separate from the control unit 500 in FIG. 2.
  • FIG. 10 is a timing diagram showing the operation timing of the pixel circuit Px20 of the second embodiment
  • FIG. 11 is a diagram showing the operation of the pixel circuit Px20 during the organic EL element OLED initialization operation of the second embodiment
  • FIG. FIG. 13 shows the operation of the pixel circuit Px20 when the threshold voltage of the driving transistor TR22 of the second embodiment is detected
  • FIG. 13 shows the operation of the pixel circuit Px20 when the scan signal SCAN of the second embodiment is applied.
  • FIG. 14 is a diagram showing the operation of the pixel circuit Px20 when the organic EL element OLED of the second embodiment is turned on.
  • the magnitude of the voltage applied to each unit in the second embodiment is [the voltage of the first voltage source VDD> the voltage of the second voltage source VSS + the threshold voltage V OLED_Vth of the organic EL element OLED. )> Voltage of reference voltage source Vref> voltage of initialization voltage source Vinit].
  • the controller sets the voltage REF applied to the gate electrode of the second setting transistor TR25 to a high level.
  • the voltage from the reference voltage source Vref is applied to the gate electrode of the driving transistor D-TR20.
  • the organic EL element OLED is in this state. It turns off.
  • the driving transistor D-TR20 is initialized.
  • the organic EL element OLED is in an off state since the organic EL element OLED has a relationship of [threshold voltage V OLED_Vth > voltage of the reference voltage source Vref> voltage of the initialization voltage source Vinit. Keep it.
  • the first switching transistor TR21, the second switching transistor TR22, and the light emission control transistor TR23 are in an off state (see FIG. 11).
  • the initialization transistor TR26 when the gate electrode of the initialization transistor TR26 is set to low level by the control unit (not shown) in the period t2 of one frame period in FIG. 10, the initialization transistor TR26 is turned off, whereby the organic EL element OLED In the floating state of the anode terminal (node N23), the voltage between the gate electrode and the second electrode of the driving transistor D-TR20 rises to the threshold voltage Vth of the driving transistor D-TR20. (See FIG. 12)
  • the gate electrode of the first setting transistor TR24 is set at the low level by the control unit (not shown) and the gate electrode of the second setting transistor TR25 is at the low level, the first setting transistor is shown. TR24 and the second setting transistor TR25 are sequentially turned off, and the second capacitor C22 is charged with a voltage corresponding to the threshold voltage Vth of the driving transistor D-TR20.
  • the image signal Vdata is applied from the data driver to the first electrodes of the first switching transistor TR21 and the second switching transistor TR22 in the period t3 of one frame period of FIG. 10, and the first switching from the gate driver.
  • the scan signal SCAN is applied to the gate electrodes of the transistor TR21 and the second switching transistor TR22, the first switching transistor TR21 and the second switching transistor TR22 are activated, and the first switching transistor TR21 and The voltages corresponding to the image signals Vdata are applied to the second electrodes (nodes N22 and N24) of the second switching transistor TR22.
  • the first capacitor C21 is charged with the voltage corresponding to the image signal Vdata, and the voltage corresponding to the image signal Vdata is applied to the gate electrode (node N21) of the driving transistor D-TR20.
  • the total voltage Vdata + Vth of the threshold voltage Vth of the driving transistor D-TR20 charged in the two capacitors C22 is applied, and the driving transistor D-TR20 is applied to the total voltage Vdata + Vth. It operates (see FIG. 13).
  • the control unit sets the gate electrode of the light emitting control transistor TR23 to a high level in the period t4 of one frame period of FIG. 10, the light emitting control transistor TR23 is turned on, and then the first switching transistor TR21 is turned on. And when the second switching transistor TR22 is turned off, a voltage corresponding to the image signal Vdata charged in the first capacitor C21 is discharged through the light emission control transistor TR23, and the driving transistor stored in the second capacitor C22 is discharged.
  • the summed voltage Vdata + Vth is applied to the gate electrode (node N21) of the driving transistor D-TR20 by adding the voltage corresponding to the threshold voltage Vth of the D-TR20, and driving transistor (
  • the D-TR20 flows a current corresponding to the sum voltage Vdata + Vth from the first voltage source VDD to the organic EL element OLED, and the organic EL element OLED at a luminance corresponding to the magnitude of this current. Emits light (see FIG. 14).
  • each pixel circuit Px20 repeats the above operation in each frame period.
  • each of the plurality of pixel circuits includes the gate driver 200 and the data driver under the control of the control unit 500. Compensation for threshold voltages different from the deterioration of the driving transistor D-TR20 of each pixel circuit Px20, which is the subject of the present invention, by operating in a known manner in accordance with the respective signals applied from the 300 and the anode driver 400.
  • OLED organic EL element
  • each pixel circuit Px20 detects the threshold voltage Vth of the driving transistor D-TR20 prior to light emission every time the organic EL element OLED emits light and detects the detected threshold voltage Vth.
  • the current corresponding to the total voltage obtained by adding the voltage corresponding to the image signal Vdata to the organic EL element OLED allows the organic EL element to emit light regardless of the deterioration caused by long-term use of the driving transistor D-TR20.
  • the device OLED may always emit light at an appropriate luminance, and at the same time, real-time compensation for a change in the threshold voltage Vth of the driving transistor D-TR20 is possible.
  • the path for charging the image signal Vdata in the first capacitor C21 and the path for charging the threshold voltage Vth of the driving transistor D-TR20 in the second capacitor C22 include the light emission control transistor TR23. Since it is separated by, the first capacitor C21 and the second capacitor C21 are not affected by the first capacitor C21 when the threshold voltage Vth of the driving transistor D-TR20 is stored in the second capacitor C22. The threshold voltage Vth of the image signal Vdata and the driving transistor D-TR20 may be accurately stored in the capacitor C22, respectively.
  • a separate external circuit or device for measuring and calculating the threshold voltage Vth of the driving transistor D-TR20 is not required as in the prior art, and in particular, a separate memory for storing the variation value of the threshold voltage Vth. It is possible to reduce the cost because it does not require.
  • the various signals and data supplied from the outside of the display unit are normal. By only checking whether it is a problem of the pixel circuit or a signal or data applied to the pixel circuit can be easily distinguished.
  • the overall configuration of the organic light emitting display device is the same as that of the organic light emitting display device of the first embodiment described with reference to FIG. different.
  • FIG. 15 is a circuit diagram schematically showing the configuration of a pixel circuit Px30 of the display portion 100 of the display device of Embodiment 3 of the present invention.
  • the pixel circuit Px30 of the present embodiment includes the organic EL element OLED, the switching transistor TR31, the first setting transistor TR32, the second setting transistor TR33, and the initialization transistor ( TR34) and five transistors of the driving transistors D-TR30 and a capacitor C.
  • Each transistor TR31, TR32, TR33, TR34, D-TR30 has a first electrode, a second electrode, and a gate electrode.
  • the switching transistor TR31 has a gate electrode connected to a gate driver (gate driver 200 of FIG. 2) not shown through a gate line, and the first electrode is connected to a data driver of FIG. 2 (data shown in FIG. 2) through a data line.
  • the second electrode is connected to one end of the capacitor C and the first electrode of the second setting transistor TR33.
  • One end of the capacitor C is connected to the second electrode of the switching transistor TR31 and the first electrode of the second setting transistor TR33, and the other end thereof is the gate electrode and the first setting transistor of the driving transistor D-TR30. It is connected with the 2nd electrode of TR32.
  • the switching transistor TR31 having such a connection relationship is turned on by the scan signal SCAN applied from the gate driver to charge the capacitor C with a voltage corresponding to the image signal Vdata applied from the data driver. do.
  • the gate electrode of the driving transistor D-TR30 is connected to the second electrode of the switching transistor TR31 via the capacitor C and simultaneously to the second electrode of the first setting transistor TR32, and the first electrode is It is connected to the first voltage source VDD, and the second electrode is connected to the anode terminal of the organic EL element OLED, and at the same time to the second electrode of the second setting transistor TR33 and the first electrode of the initialization transistor TR34. do.
  • the driving transistors D-TR30 connected as described above are the sum of the voltages Vdata + of the voltage corresponding to the image signal Vdata, which is the voltage charged in the capacitor C, and the threshold voltage Vth of the driving transistor D-TR30.
  • a current corresponding to Vth flows from the first voltage source VDD to the organic EL element OLED, and the organic EL element OLED emits light at a luminance corresponding to this current.
  • the gate electrode REF is connected to a control unit (not shown), the first electrode is connected to a data driver (not shown) through a data line, and the second electrode is connected to the other end of the capacitor C and It is connected to the gate electrode of the driving transistor D-TR30.
  • the second setting transistor TR33 has a gate electrode SET connected to a controller (not shown), a first electrode connected to one end of the capacitor C and a second electrode of the switching transistor TR31, and the second electrode The anode terminal of the organic EL element OLED of the driving transistor D-TR30 and the second electrode and the first electrode of the initialization transistor TR34 are connected.
  • the initialization transistor TR34 has a gate electrode INIT connected to a control unit (not shown), and the first electrode is formed of an anode terminal of the organic EL element OLED, a driving transistor D-TR30, and a second setting transistor TR33.
  • the second electrode is connected to the second electrode, and the second electrode is connected to the initialization voltage source Vinit.
  • the first setting transistor TR32, the second setting transistor TR33, and the initialization transistor TR34 operate during the initialization operation of the driving transistors D-TR30 and the detection of the threshold voltage Vth. Details thereof will be described later.
  • the organic EL element OLED has an anode terminal connected to the first voltage source VDD via the driving transistor D-TR30 and at the same time the second electrode of the second setting transistor TR33 and the first transistor TR34 are formed. It is connected to one electrode, the cathode terminal is connected to the second voltage source VSS, and emits light under the control of the driving transistor D-TR30 when the initialization transistor TR34 is turned off.
  • the control unit connected to the gate electrodes of the first setting transistor TR32, the second setting transistor TR33, and the initialization transistor TR34 may control the overall operation of the organic light emitting display device including the gate driver and the data driver (FIG. 2).
  • the control unit 500 may also function as the function, or may be a separate control unit separate from the control unit 500 of FIG. 2.
  • FIG. 16 is a timing diagram showing the operation timing of the pixel circuit Px30 of the third embodiment
  • FIG. 17 is a diagram showing the operation of the pixel circuit Px30 during the organic EL element OLED initialization operation of the third embodiment
  • FIG. 18 shows the operation of the pixel circuit Px30 when the threshold voltage of the driving transistor TR32 of the third embodiment is detected
  • FIG. 19 shows the operation of the pixel circuit Px30 when the scan signal SCAN of the third embodiment is applied. It is a figure which shows.
  • the magnitude of the voltage applied to each unit in the present embodiment is [voltage of the first voltage source VDD> voltage of the second voltage source VSS + threshold voltage V OLED_Vth of the organic EL element OLED. > Voltage of initialization voltage source Vinit].
  • the threshold voltage Vth of the driving transistor D-TR30 is used in a section in which the data driver does not have this data. Used for detection.
  • a data driver (not shown in FIG. A voltage is applied to the gate electrode of the driving transistor D-TR30 from the data driver 300 of 2, and the voltage applied thereto is a period in which there is no data between the valid data signal (image signal Vdata) and the valid data signal. Is the data signal at.
  • the controller turns off the initialization transistor TR34 by setting the gate voltage of the initialization transistor TR34 to low level.
  • the voltage of the second electrode of the driving transistor D-TR30 (voltage of the node N33) rises to the threshold voltage Vth of the driving transistor D-TR30 in the floating state, and then the second setting transistor (
  • the capacitor C has a voltage between the gate electrode and the second electrode of the driving transistor D-TR30, that is, the threshold voltage of the driving transistor D-TR30. The voltage corresponding to Vth is charged (see FIG. 18).
  • the switching transistor TR31 is activated, and the image signal Vdata is applied to the first electrode.
  • the node N32 which is the second electrode of the switching transistor TR31
  • a voltage corresponding to the image signal Vdata is applied, and the voltage corresponding to the image signal Vdata is charged to the capacitor C in the period t3.
  • a total voltage Vdata + Vth summed with the threshold voltage Vth of the driving transistor D-TR30 it is applied to the node N31, which is the gate electrode terminal of the driving transistor D-TR30, and consequently to the capacitor C.
  • the driving transistor D-TR30 is charged with a total voltage Vdata + Vth obtained by adding up the image signal Vdata and the threshold voltage Vth of the driving transistor D-TR30 (see FIG. 19).
  • the driving transistor D-TR30 is the capacitor C.
  • the first voltage source is a voltage charged at the first voltage source, that is, a current corresponding to the sum voltage Vdata + Vth, the sum of the voltage corresponding to the image signal Vdata and the threshold voltage Vth of the driving transistor D-TR30.
  • the organic EL element OLED which is a light emitting element, emits light at a luminance corresponding to the magnitude of this current by flowing from the VDD to the organic EL element OLED.
  • each pixel circuit Px30 repeats the above operation for each frame period.
  • each of the plurality of pixel circuits includes the gate driver 200 and the data driver under the control of the controller 500.
  • a threshold voltage different from the deterioration of the driving transistor D-TR30 of each pixel circuit Px30, which is the subject of the present invention is compensated for.
  • OLED organic EL element
  • each pixel circuit Px30 detects the threshold voltage Vth of the driving transistor D-TR30 prior to light emission every time the organic EL element OLED emits light, and detects the detected threshold voltage ( The current corresponding to the total voltage obtained by adding the voltage corresponding to Vth) to the image signal Vdata is passed through the organic EL device OLED, so that the light emitting device is independent of deterioration due to prolonged use of the driving transistor D-TR30.
  • the organic EL element OLED can always emit light at an appropriate luminance, and real-time compensation can be made for the variation of the threshold voltage Vth of the driving transistor D-TR30.
  • the number of power supplies can be reduced because a separate power supply is not used to detect the threshold voltage Vth of the driving transistor D-TR30 and a section in which valid data does not exist among data signals applied from the data driver is used. have.
  • a separate external circuit or device for measuring and calculating the threshold voltage Vth of the driving transistor D-TR30 is not required as in the prior art, and in particular, a separate memory for storing the variation value of the threshold voltage Vth. It is possible to reduce the cost because it does not require.
  • the quality of various signals and data supplied from the outside of the display unit is normal even when a degradation in image quality occurs due to a decrease in luminance of the display device. By only checking whether it is a problem of the pixel circuit or a signal or data applied to the pixel circuit can be easily distinguished.
  • each transistor constituting the pixel circuit has been described as an n-channel FET, but a p-channel FET may be used.
  • the level of the gate signal applied to the gate electrode of each transistor is opposite to that of the n-channel type.

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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 El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un appareil destiné à compenser les écarts d'une tension de seuil causés par la détérioration d'un transistor d'attaque (D-TR10) qui constitue un circuit de pixels d'un dispositif d'affichage électroluminescent organique, l'appareil comprenant une pluralité de circuits de pixels (Px10) disposés sur des zones où une pluralité de lignes de grille fournissant des signaux de balayage (SCAN) croisent une pluralité de lignes de données fournissant des signaux de pixels (Vdata). Chaque circuit de pixels de la pluralité comprend : un dispositif électroluminescent organique (DELO) ; un transistor d'attaque (D-TR10) qui régule le courant passant à travers le dispositif électroluminescent organique (DELO) en réponse au signal de pixels (Vdata) appliqué sur la ligne de données ; un transistor de commutation (TR11) connecté entre une électrode de grille du transistor d'attaque et la ligne de données avec un deuxième condensateur (C12) interposé entre eux et dont l'état de conduction est régulé en fonction du signal de balayage (SCAN) ; un premier condensateur (C11) connecté entre le transistor de commutation et une première source de tension (VDD) pour charger une tension correspondant au signal de pixels ; et le deuxième condensateur (C12) connecté entre une extrémité du premier condensateur et l'électrode de grille du transistor d'attaque pour charger la tension de seuil (Vth) du transistor d'attaque (D-TR10), ce dernier appliquant sur le dispositif électroluminescent organique (DELO) un courant correspondant à une tension totalisée (Vdata+Vth) de la tension chargée dans le premier condensateur et de la tension chargée dans le deuxième condensateur.
PCT/KR2015/004265 2014-04-30 2015-04-28 Appareil et procédé de compensation d'écart de luminosité de dispositif d'affichage électroluminescent organique Ceased WO2015167227A1 (fr)

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KR1020140052771A KR20150125413A (ko) 2014-04-30 2014-04-30 유기발광 표시장치의 휘도 편차 보상장치 및 보상방법
KR10-2014-0052783 2014-04-30
KR1020140052783A KR20150125419A (ko) 2014-04-30 2014-04-30 유기발광 표시장치의 휘도 편차 보상장치 및 보상방법
KR1020140052761A KR20150125408A (ko) 2014-04-30 2014-04-30 유기발광 표시장치의 휘도 편차 보상장치 및 보상방법
KR10-2014-0052771 2014-04-30
KR10-2014-0052761 2014-04-30

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