WO2021022601A1 - Appareil d'affichage amoled et son procédé d'attaque - Google Patents

Appareil d'affichage amoled et son procédé d'attaque Download PDF

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Publication number
WO2021022601A1
WO2021022601A1 PCT/CN2019/104222 CN2019104222W WO2021022601A1 WO 2021022601 A1 WO2021022601 A1 WO 2021022601A1 CN 2019104222 W CN2019104222 W CN 2019104222W WO 2021022601 A1 WO2021022601 A1 WO 2021022601A1
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WO
WIPO (PCT)
Prior art keywords
pixel unit
thin film
film transistor
electrically connected
threshold voltage
Prior art date
Application number
PCT/CN2019/104222
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English (en)
Chinese (zh)
Inventor
田新斌
徐向阳
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深圳市华星光电技术有限公司
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Publication of WO2021022601A1 publication Critical patent/WO2021022601A1/fr

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Classifications

    • 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
    • G09G3/3258—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 voltage across the light-emitting element

Definitions

  • OLED display devices can be divided into passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED) are two categories, namely direct addressing and thin film transistor (Thin Film Transistor, TFT) matrix addressing.
  • AMOLED has pixels arranged in an array, is an active display type, has high luminous efficiency, and is generally used as a high-definition large-size display device.
  • AMOLED is a current drive device. When a current flows through the organic light-emitting diode, the organic light-emitting diode emits light, and the light-emitting brightness is determined by the current flowing through the organic light-emitting diode itself.
  • the conventional 2T1C pixel driving circuit for AMOLED includes a first thin film transistor T10, a second thin film transistor T20, a capacitor C10, and an organic light emitting diode D10.
  • the first thin film transistor T10 is a switch Thin film transistors
  • the second thin film transistor T20 is a driving thin film transistor
  • the capacitor C10 is a storage capacitor.
  • the anode of the test organic light emitting diode is grounded.
  • the gate of the first thin film transistor receives the scan signal, the source receives the data signal, and the drain is electrically connected to the first node;
  • the gate of the second thin film transistor is electrically connected to the first node, the source is electrically connected to the anode of the display organic light emitting diode, and the drain receives the power supply voltage;
  • the first terminal of the first capacitor is electrically connected to the first node, and the second terminal is grounded;
  • the scan signal controls the first thin film transistor and the third thin film transistor to turn on, and the data signal charges the first capacitor and the third capacitor so that the voltages of the first node and the second node rise, and the second and Four thin film transistors are turned on, indicating that the organic light-emitting diode and the test organic light-emitting diode start to emit light;
  • the display pixel unit is arranged in the effective display area of the AMOLED display device, and the threshold voltage compensation unit and the test pixel unit are arranged in the non-display area surrounding the effective display area of the AMOLED display device. Area.
  • FIG. 1 is a circuit diagram of a conventional AMOLED pixel driving circuit
  • FIG. 3 is a circuit diagram of a display pixel unit of the AMOLED display device of the present invention.
  • FIG. 4 is a circuit diagram of the test pixel unit of the AMOLED display device of the present invention
  • the display pixel unit 10 and the test pixel unit 30 are used for receiving the scan signal Gate and the data signal Data, and emit light under the driving of the scan signal Gate and the data signal Data;
  • the gate of the second thin film transistor T2 is electrically connected to the first node A, the source is electrically connected to the anode of the display organic light emitting diode D1, and the drain receives the power supply voltage Vdd;
  • the first terminal of the first capacitor C1 is electrically connected to the first node A, and the second terminal is grounded;
  • the anode of the display organic light emitting diode D1 is grounded.
  • the gate of the third thin film transistor T3 receives the scan signal Gate, the source receives the data signal Data, and the drain is electrically connected to the second node B;
  • the gate of the fourth thin film transistor T4 is electrically connected to the second node B, the source is electrically connected to the anode of the test organic light emitting diode D2, and the drain receives the power supply voltage Vdd;
  • the first terminal of the third capacitor C3 is electrically connected to the second node B, and the second terminal is grounded;
  • the anode of the test organic light emitting diode D2 is grounded.
  • first thin film transistor T1, the second thin film transistor T2, the first capacitor C1, and the display organic light emitting diode D1 are respectively connected with the third thin film transistor T3, the fourth thin film transistor T4, the third capacitor C3 and the test organic light emitting diode.
  • the electrical performance of D2 is the same, so that the threshold voltage drift in the display pixel unit 10 can be reflected by the test pixel unit 30.
  • the display pixel unit 10 is arranged in the effective display area 1 of the AMOLED display device, and the threshold voltage compensation unit 20 and the test pixel unit 30 are arranged in the AMOLED display device surrounding the effective display area 1.
  • the test pixel unit 30 and the threshold voltage compensation unit 20 cooperate to complete the threshold voltage compensation of the display pixel unit 10.
  • the display pixel unit 10 can be simplified.
  • the circuit structure increases the aperture ratio and driving cost of the display pixel unit 10, and improves the display effect.
  • the scan signal Gate controls the first thin film transistor T1 and the third thin film transistor T3 to turn on, and the data signal Data charges the first capacitor C1 and the third capacitor C3, so that the first node A and the second node
  • the voltage of B rises, the second and fourth thin film transistors T4 are turned on, indicating that the organic light emitting diode D1 and the test organic light emitting diode D2 start to emit light;
  • the threshold voltage compensation unit 20 detects the current flowing through the test pixel unit 30 from the source of the fourth thin film transistor T4, and compares the current flowing through the test pixel unit 30 with a preset standard current , Output the compensation signal ST according to the comparison result;
  • the threshold voltage compensation unit 20 determines that the threshold voltage drift of the driving thin film transistor, that is, the second thin film transistor T2, is ⁇ Vth according to the comparison result of the current flowing through the test pixel unit 30 and the preset standard current, the threshold The voltage magnitude of the compensation signal ST output by the voltage compensation unit 20 is:
  • ⁇ V is the voltage of the compensation signal ST
  • C2 is the size of the first capacitor C2
  • C1 is the size of the first capacitor C1
  • Cgd1 is the parasitic capacitance between the gate and drain of the first thin film transistor T1
  • Cgd2 is The parasitic capacitance between the gate and drain of the second thin film transistor T2
  • Cgs2 is the parasitic capacitance between the gate and the source of the second thin film transistor T2.
  • the present invention performs threshold voltage compensation by setting the test pixel unit and the threshold voltage compensation unit, which can effectively compensate the threshold voltage of the driving thin film transistor while simplifying the structure of the compensation circuit, increasing the aperture ratio and reducing the driving cost.
  • the present invention also provides a driving method of an AMOLED display device, including the following steps:
  • Step S1 Provide an AMOLED display device, including a display pixel unit 10, a threshold voltage compensation unit 20 electrically connected to the display pixel unit 10, and a test pixel unit 30 electrically connected to the threshold voltage compensation unit 20.
  • the display pixel unit 10 includes: a first thin film transistor T1, a second thin film transistor T2, a first capacitor C1, a second capacitor C2 And display organic light emitting diode D1;
  • the gate of the first thin film transistor T1 receives the scan signal Gate, the source receives the data signal Data, and the drain is electrically connected to the first node A;
  • the gate of the second thin film transistor T2 is electrically connected to the first node A, the source is electrically connected to the anode of the display organic light emitting diode D1, and the drain receives the power supply voltage Vdd;
  • the first terminal of the first capacitor C1 is electrically connected to the first node A, and the second terminal is grounded;
  • the first terminal of the second capacitor C2 receives the compensation signal ST, and the second terminal is electrically connected to the first node A;
  • the anode of the display organic light emitting diode D1 is grounded.
  • the test pixel unit 30 includes: a third thin film transistor T3, a fourth thin film transistor T4, a third capacitor C3 and a test organic light emitting diode D2;
  • the gate of the third thin film transistor T3 receives the scan signal Gate, the source receives the data signal Data, and the drain is electrically connected to the second node B;
  • the first terminal of the third capacitor C3 is electrically connected to the second node B, and the second terminal is grounded;
  • the anode of the test organic light emitting diode D2 is grounded.
  • first thin film transistor T1, the second thin film transistor T2, the first capacitor C1, and the display organic light emitting diode D1 are respectively connected with the third thin film transistor T3, the fourth thin film transistor T4, the third capacitor C3 and the test organic light emitting diode.
  • the electrical performance of D2 is the same, so that the threshold voltage drift in the display pixel unit 10 can be reflected by the test pixel unit 30.
  • the threshold voltage compensation unit 20 is electrically connected to the source of the fourth thin film transistor T4.
  • the display pixel unit 10 is arranged in the effective display area 1 of the AMOLED display device, and the threshold voltage compensation unit 20 and the test pixel unit 30 are arranged in the AMOLED display device surrounding the effective display area 1.
  • the test pixel unit 30 and the threshold voltage compensation unit 20 cooperate to complete the threshold voltage compensation of the display pixel unit 10.
  • the display pixel unit 10 can be simplified.
  • the circuit structure increases the aperture ratio and driving cost of the display pixel unit 10, and improves the display effect.
  • the AMOLED display device further includes: a gate driver 40, a source driver 50, a power source 60, a signal interface 70, a gamma converter 80, and a timing controller 90.
  • the signal interface 60 is electrically connected to the power supply 60 and the timing controller 90, which receives external voltage signals and low-voltage differential signals (Low-Voltage Differential Signaling, LVDS), and input voltage signals to the power supply 60, and input LVDS signals to the timing controller 90;
  • the timing controller 90 is electrically connected to the power supply 60, the signal interface 70, the source driver 50, and the gate driver 40 It receives the power supply voltage from the power supply 60, receives the LVDS signal from the signal interface 60, generates a Mini LVDS signal to the source driver 50, and generates a clock signal to the gate driver 40;
  • the gamma converter 80 is electrically connected to the power supply 60 and the source driver 50, which receive a common voltage from the power source 60 and generate a gamma voltage to the source
  • the scan signal Gate controls the first thin film transistor T1 and the third thin film transistor T3 to turn on, and the data signal Data charges the first capacitor C1 and the third capacitor C3, so that the first node A and the The voltage of the two nodes B rises, the second and fourth thin film transistors T4 are turned on, indicating that the organic light emitting diode D1 and the test organic light emitting diode D2 start to emit light.
  • Step S3 The threshold voltage compensation unit 20 detects the current flowing through the test pixel unit 30, compares the current flowing through the test pixel unit 30 with a preset standard current, and outputs a threshold voltage for compensating the display pixel unit 10 according to the comparison result The compensation signal ST;
  • the threshold voltage compensation unit 20 detects the current flowing through the test pixel unit 30 from the source of the fourth thin film transistor T4, and compares the current flowing through the test pixel unit 30 with a preset The standard current outputs a compensation signal ST according to the comparison result.
  • the threshold voltage compensation unit 20 determines that the threshold voltage drift of the driving thin film transistor, that is, the second thin film transistor T2, is ⁇ Vth according to the comparison result of the current flowing through the test pixel unit 30 and the preset standard current, the threshold The voltage magnitude of the compensation signal ST output by the voltage compensation unit 20 is:
  • ⁇ V is the voltage of the compensation signal ST
  • C2 is the size of the first capacitor C2
  • C1 is the size of the first capacitor C1
  • Cgd1 is the parasitic capacitance between the gate and drain of the first thin film transistor T1
  • Cgd2 is The parasitic capacitance between the gate and drain of the second thin film transistor T2
  • Cgs2 is the parasitic capacitance between the gate and the source of the second thin film transistor T2.
  • Step S4 The display pixel unit 10 receives the compensation signal ST, and uses the compensation signal ST to complete threshold voltage compensation.
  • the first end of the second capacitor C2 receives the compensation signal ST, so that the voltage of the first node A continues to rise to compensate for the threshold voltage shift of the second thin film transistor T2.
  • the present invention provides an AMOLED display device including a display pixel unit, a threshold voltage compensation unit electrically connected to the display pixel unit, and a test pixel unit electrically connected to the threshold voltage compensation unit;
  • the display pixel unit and the test pixel unit are used to receive scan signals and data signals, and emit light under the drive of the scan signals and data signals;
  • the threshold voltage compensation unit is used to detect the current flowing through the test pixel unit and compare The current flowing through the test pixel unit and the preset standard current, and output a compensation signal to the display pixel unit according to the comparison result, to perform threshold voltage compensation on the display pixel unit, by setting the test pixel unit and the threshold voltage compensation unit to perform Threshold voltage compensation can effectively compensate the threshold voltage of the driving thin film transistor while simplifying the structure of the compensation circuit, increasing the aperture ratio and reducing the driving cost.
  • the present invention also provides a driving method of an AMOLED display device, which can effectively compensate the threshold voltage of the driving thin film transistor while simplifying the structure of the compensation circuit, increasing the

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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)
  • Electroluminescent Light Sources (AREA)

Abstract

La présente invention concerne un appareil d'affichage AMOLED et son procédé d'attaque. L'appareil d'affichage AMOLED comprend une unité de pixel d'affichage (10), une unité de compensation de tension de seuil (20) électriquement connectée à l'unité de pixel d'affichage (10), et une unité de pixel de test (30) électriquement connectée à l'unité de compensation de tension de seuil (20), l'unité de pixel d'affichage (10) et l'unité de pixel de test (30) servant à recevoir un signal de balayage (Grille) et un signal de données (Données), et émettant de la lumière sous l'attaque du signal de balayage (Grille) et du signal de données (Données) ; et l'unité de compensation de tension de seuil (20) sert à détecter le courant circulant à travers l'unité de pixel de test (30), à comparer le courant circulant à travers l'unité de pixel de test (30) à un courant standard prédéfini, et à délivrer, en fonction d'un résultat de comparaison, un signal de compensation (ST) à l'unité de pixel d'affichage (10), de manière à effectuer une compensation de tension de seuil sur l'unité de pixel d'affichage (10), de telle sorte que la structure d'un circuit de compensation peut être simplifiée tout en compensant efficacement la tension de seuil d'un transistor d'attaque à couches minces (T2), un rapport d'ouverture peut être amélioré et les coûts d'attaque peuvent être réduits.
PCT/CN2019/104222 2019-08-06 2019-09-03 Appareil d'affichage amoled et son procédé d'attaque WO2021022601A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910723263.8A CN110570820B (zh) 2019-08-06 2019-08-06 Amoled显示装置及其驱动方法
CN201910723263.8 2019-08-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113487994A (zh) * 2021-06-16 2021-10-08 中国科学院微电子研究所 一种像素电路、显示设备及像素补偿方法

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CN111179842B (zh) * 2020-03-12 2021-03-30 京东方科技集团股份有限公司 补偿电路、显示模组及其驱动方法
CN111627375B (zh) * 2020-05-29 2022-02-08 上海天马微电子有限公司 驱动电路及其驱动方法和显示装置
CN112599078B (zh) * 2020-12-17 2022-03-01 北京大学深圳研究生院 一种像素单元及像素外模拟域补偿显示系统
CN115331613A (zh) * 2022-08-15 2022-11-11 惠科股份有限公司 驱动电路、驱动方法及显示装置

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CN102654973A (zh) * 2011-08-15 2012-09-05 京东方科技集团股份有限公司 像素电路及其驱动方法、显示面板
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