WO2022041966A1 - 显示装置及其驱动方法 - Google Patents

显示装置及其驱动方法 Download PDF

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Publication number
WO2022041966A1
WO2022041966A1 PCT/CN2021/100968 CN2021100968W WO2022041966A1 WO 2022041966 A1 WO2022041966 A1 WO 2022041966A1 CN 2021100968 W CN2021100968 W CN 2021100968W WO 2022041966 A1 WO2022041966 A1 WO 2022041966A1
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light
emitting
emitting element
transistor
oled
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PCT/CN2021/100968
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English (en)
French (fr)
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山下佳大朗
康哲彦
李向抒
沈飞
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上海和辉光电股份有限公司
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Priority to EP21859810.0A priority Critical patent/EP4207156A4/en
Priority to US18/043,341 priority patent/US20230335055A1/en
Publication of WO2022041966A1 publication Critical patent/WO2022041966A1/zh

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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
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0847—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory without any storage capacitor, i.e. with use of parasitic capacitances as storage elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes

Definitions

  • the present invention relates to the field of display technology, and in particular, to a display device and a driving method thereof.
  • OLED Organic Light-Emitting Diode, Organic Light Emitting Diode
  • display devices are prone to flickering problems under low frame rate display conditions.
  • the flicker problem is caused by leakage current or hysteresis voltage.
  • This article mainly focuses on the hysteresis voltage.
  • the driving current I OLED of the OLED light-emitting element is generated by the following formula (1):
  • the luminance error ⁇ I OLED of the OLED light-emitting element is generated by the following formula (2):
  • the principle of the flicker caused by the hysteresis voltage is that in the initial stage of each frame period, due to the existence of the hysteresis voltage, the OLED light-emitting element has a luminescence delay phenomenon, which causes the display brightness to have a brightness delay in the initial stage of each frame period. Under low frame rate/low grayscale display conditions, this segment of luminance delay is perceived by the human eye, resulting in visual flickering.
  • VRR Very Refresh Rate
  • the present invention provides a display device and a driving method thereof to solve the problem of visual flicker.
  • One aspect of the present invention provides a method for driving a display device, including the steps of: providing a display device, the display device includes a plurality of sub-pixels, each of the sub-pixels includes an OLED light-emitting element, and transmitting driving to the OLED light-emitting element a current light-emitting transistor and a reset transistor coupled to an anode of the OLED light-emitting element; inputting a periodic cut-off signal to the light-emitting transistor; determining an effective light-emitting phase of each frame period of the sub-pixel; and, in A reset signal is input to the reset transistor corresponding to one or more of the cut-off signals during the effective light-emitting phase of each of the frame periods of the sub-pixels.
  • the step of determining the effective light-emitting phase of each frame period of the sub-pixel includes: inputting an initial reset signal with a period of the frame period to the reset transistor; obtaining the sub-pixel response the delayed light-emitting time of the initial reset signal; and, in each of the frame periods, the stage after the delayed light-emitting time is used as the effective light-emitting stage.
  • the input frequency of the reset signal is determined according to the frame period and the delayed lighting time, so that within each frame period, The frequency of the luminance delay resulting from the delayed lighting time and the reset signal is not visible.
  • the reset signal is a periodic or aperiodic pulsed signal.
  • the anode and the cathode of the OLED light-emitting element have parasitic capacitance, and in response to the initial reset signal, before the driving current flows through the OLED light-emitting element, the parasitic capacitance of the OLED light-emitting element is first The capacitor is charged, so that the OLED light-emitting element generates the delayed light-emitting time.
  • each of the sub-pixels further includes a drive transistor for generating the drive current, and the drive transistor is connected to the OLED light-emitting element through the light-emitting transistor.
  • a display device comprising a plurality of sub-pixels arranged in a matrix of rows and columns, each of the sub-pixels includes: an OLED light-emitting element; a light-emitting transistor for transmitting a driving current to the OLED light-emitting element; a reset transistor , coupled to the anode of the OLED light-emitting element; wherein the light-emitting transistor receives a periodic cut-off signal, the OLED light-emitting element has an effective light-emitting phase in each frame period, and the reset transistor is in each of the During the effective light-emitting phase of the frame period, a reset signal corresponding to one or more of the cut-off signals is received.
  • the reset transistor further receives an initial reset signal with a period of the frame period, the OLED light-emitting element generates a delayed light-emitting time in response to the initial reset signal, and the effective light-emitting period is each a stage in the frame period after the delayed lighting time.
  • the input frequency of the reset signal is related to the frame period and the delayed lighting time, so that the delayed lighting time and the reset signal are generated in each frame period.
  • the frequency of the brightness delay is not visible.
  • each of the sub-pixels further includes: a driving transistor for generating the driving current, and the driving transistor is connected to the OLED light-emitting element through the light-emitting transistor.
  • the OLED light-emitting element is reset by the reset transistor, so that a short luminance delay occurs when the OLED light-emitting element emits light after the black screen.
  • These short luminance delays are used to supplement The flicker frequency caused by the inherent brightness delay of the OLED light-emitting element at the initial stage of each frame period reduces the overall observability of the flicker frequency caused by the brightness delay, thereby eliminating visual flicker.
  • FIG. 1 shows a schematic circuit diagram of a sub-pixel of a display device in an embodiment of the present invention
  • FIG. 2 shows a schematic diagram of steps of a method for driving a display device in an embodiment of the present invention
  • FIG. 3 shows a schematic diagram of a scene of a method for driving a display device in an embodiment of the present invention
  • FIG. 4 shows a schematic time sequence diagram of causing a delayed light-emitting time in an embodiment of the present invention
  • FIG. 5 shows a brightness change curve and a flickering visibility curve of the display device using a conventional driving method
  • FIG. 6 shows the brightness change curve and the flicker visibility curve of the display device after the driving method of the present invention is adopted.
  • sequence numbers of the steps in the following method embodiments are only used to represent different execution contents, and do not limit the logical relationship and execution sequence between the steps.
  • FIG. 1 shows a circuit structure of a sub-pixel of a display device in an embodiment
  • FIG. 2 shows the main steps of a driving method of the display device in the embodiment
  • FIG. 3 shows an implementation scene of the driving method of the display device in the embodiment.
  • the driving method of the display device in this embodiment mainly includes: in step S210 , a display device is provided, the display device includes a plurality of sub-pixels, and the circuit structure of each sub-pixel is shown in FIG.
  • step S220 a periodic cut-off signal is input to the light-emitting transistor;
  • step S230 the effective light-emitting stage of each frame period of the sub-pixel is determined; and in step S240, in the effective light-emitting stage of each frame period of the sub-pixel, corresponding to one or more cut-off signals, a reset transistor is input to the reset transistor. set signal.
  • the signal EM is a periodic turn-off signal input to the gate of the light-emitting transistor 12 .
  • the signal EM is a periodic high-level signal, which is used to generate a black picture according to a certain frequency in each frame period. Specifically, as shown in FIG. 1 and FIG.
  • the signal EM includes 32 high-level signals in one frame period (Frame), and the signal EM can be provided to the gate of the light-emitting transistor 12 in the form of a periodic pulse signal.
  • one frame period (Frame) is, for example, 30 Hz.
  • the reset transistor in the effective light-emitting stage of each frame period, corresponding to the black screen generated by the cut-off signal, the reset transistor is used to reset the OLED light-emitting element, so that a short luminance delay occurs when the OLED light-emitting element emits light after the black screen.
  • These short luminance delays It is used to supplement the inherent brightness delay of the OLED light-emitting element at the initial stage of each frame period, so that the overall observability of the flicker frequency caused by the brightness delay is reduced, thereby eliminating visual flicker.
  • the step of determining the effective light-emitting stage of each frame period of the sub-pixel includes: inputting an initial reset signal with a period of the frame period to the reset transistor; obtaining the delayed light-emitting time of the sub-pixel in response to the initial reset signal; And, in each frame period, the stage after the delayed light-emitting time is regarded as the effective light-emitting stage.
  • the signal Sn is a level signal received by the gate of the reset transistor 13 , and the signal Sn includes an initial reset signal 301 whose period is a frame period.
  • the parasitic capacitance C OLED of the OLED light-emitting element 11 is charged first, As a result, the OLED light-emitting element 11 generates a delayed light-emitting time t DELAY .
  • the EM signal is at a high level at this time, the OLED light-emitting element 11 does not work, and the The transistor 13 is set to discharge the parasitic capacitance C OLED of the OLED light-emitting element 11 to prevent the contrast from decreasing.
  • the initial reset signal 301 is set to a high level, and the EM signal is set to a low level, the reset process ends, and the OLED light-emitting element 11 enters the light-emitting stage.
  • the driving current I OLED that should flow through the OLED light-emitting element 11 in the light-emitting stage, that is, flows from the anode of the OLED light-emitting element 11 to its cathode, makes the OLED light-emitting element 11 emit light.
  • the capacitor C OLED is charged, and then flows through the OLED light-emitting element 11, so that the OLED light-emitting element 11 enters an effective light-emitting stage. Therefore, in the initial stage of the frame period, due to the charging process of the parasitic capacitance C OLED , there is a certain time delay in the light emission of the OLED light-emitting element 11, which is shown in FIG.
  • the delayed luminescence time t DELAY is specifically determined according to the following formula (3):
  • V F is the forward voltage drop of the OLED light-emitting element 11 , that is, the voltage value between the anode and the cathode of the OLED light-emitting element 11 to ensure the normal light-emitting of the OLED light-emitting element 11 .
  • the delayed light-emitting time t DELAY has a grayscale dependence, and in a high gray-scale display condition (the driving current I OLED is high) the delayed light-emitting time t DELAY is a very small value and can be ignored.
  • the influence brought by the delayed light-emitting time t DELAY is shown as a luminance delay 303 in the light-emitting luminance of the sub-pixels at the initial stage of a frame period (Frame).
  • the inherent luminance delay 303 caused by the hysteresis voltage of the sub-pixels may cause visual flickering. Therefore, in this embodiment, some short luminance delays 304 are inserted after the inherent luminance delay 303 in each frame period, so as to increase the occurrence frequency of luminance delays in each frame period, thereby reducing the effect of human eyes on the luminance delay caused by the luminance delay. Flicker sensitivity to eliminate visual flicker.
  • a reset signal corresponding to one or more off signals is input to the reset transistor.
  • the reset transistor For example, as shown in FIG. 3 , in the effective light-emitting stage 300 of one frame period (Frame) of the sub-pixel, five reset signals 302 are input to the reset transistor through the signal Sn, and the five reset signals 302 correspond to the corresponding phase Five cutoff signals at intervals.
  • the reset signal 302 can be a periodic or aperiodic pulse signal, and its specific input frequency is determined according to the frame period and the delayed lighting time, so that in each frame period, the brightness generated by the delayed lighting time and the reset signal is delayed. frequency is not visible. Similar to the initial reset signal 301 , the reset signal 302 is a signal capable of realizing the reset operation of the OLED light-emitting element 11 .
  • the reset transistor 13 when the gate of the reset transistor 13 receives the reset signal 302, the reset transistor 13 also discharges the parasitic capacitance C OLED of the OLED light-emitting element 11;
  • the signal 302 ends, the signal Sn is set high, and the signal EM is set low, the driving current I OLED first charges the parasitic capacitor C OLED , and then flows through the OLED light-emitting element 11 for emitting light. Therefore, after each reset signal 302 of the OLED light-emitting element 11, there will be a short luminance delay 304 in its luminance.
  • These short luminance delays 304 increase the total occurrence frequency of luminance delays in each frame period, thereby reducing the The visual flicker sensitivity caused by the inherent luminance delay 303 makes the overall flicker variation within each frame period invisible from a visual perspective.
  • each sub-pixel circuit is connected to the power supply voltages ELVDD and ELVSS, and each sub-pixel circuit further includes a driving transistor 14 for generating a driving current I OLED , and the driving transistor 14 is connected to the OLED light-emitting element through the light-emitting transistor 12 11.
  • FIG. 5 shows the brightness change curve and flicker visibility curve of the display device using the traditional driving method
  • FIG. 6 shows the brightness change curve and the flicker visibility curve of the display device after using the driving method of the present invention.
  • the frame frequency of the display device is 30 Hz
  • the gray scale is 46, for example.
  • the display device In the initial stage of a frame period, the display device has inherent luminance delay, which appears as a sudden drop in luminance 501 in the luminance change curve 5a, and in the subsequent stage of the frame period, the luminance change curve 5a has a relatively stable trend.
  • the reset transistor in the effective light-emitting stage of each frame period of the sub-pixel, corresponding to the black screen generated by the cut-off signal, the reset transistor is used to reset the OLED light-emitting element, so that the OLED light-emitting element emits light after the black screen.
  • Short brightness delay which is used to supplement the flicker frequency caused by the inherent brightness delay of the OLED light-emitting element at the initial stage of each frame period, so as to reduce the overall observability of the flicker frequency caused by the brightness delay, so as to eliminate the Visual flickering effect.
  • An embodiment of the present invention further provides a display device, which includes a plurality of sub-pixels arranged in a matrix of rows and columns.
  • each sub-pixel includes: an OLED light-emitting element 11; The drive current I OLED is transmitted; the reset transistor 13 is coupled to the anode of the OLED light-emitting element 11; wherein, the gate of the light-emitting transistor 12 receives a periodic cut-off signal to generate a continuous black picture; the OLED light-emitting element 11 is in each frame The period has an effective light-emitting stage, and the reset transistor 13 receives a reset signal corresponding to one or more cut-off signals in the effective light-emitting stage of each frame period, so that a short brightness delay occurs when the OLED light-emitting element 11 emits light after the black screen.
  • Some short brightness delays are used to supplement the flicker frequency caused by the inherent brightness delay of the OLED light-emitting element 11 at the initial stage of each frame period, so as to reduce the overall observability of the flicker frequency caused by the brightness delay, so as to achieve the effect of eliminating visual flicker. .
  • Each sub-pixel further includes a driving transistor 14 for generating a driving current I OLED , and the driving transistor 14 is connected to the OLED light-emitting element 11 through the light-emitting transistor 12 .
  • the reset transistor also receives an initial reset signal with a frame period
  • the OLED light-emitting element generates a delayed light-emitting time in response to the initial reset signal
  • the effective light-emitting stage is the stage after the delayed light-emitting time in each frame period.
  • the input frequency of the reset signal is specifically related to the frame period and the delayed lighting time, so that in each frame period, the frequency of the brightness delay caused by the delayed lighting time and the reset signal is invisible.
  • the display device of this embodiment is driven by the driving method of the above-mentioned embodiment, so as to achieve the effect of eliminating visual flicker.
  • driving method of the above-mentioned embodiment so as to achieve the effect of eliminating visual flicker.
  • the reset transistor in the effective light-emitting stage of each frame period of the sub-pixel, corresponding to the black screen generated by the cut-off signal, the reset transistor is used to reset the OLED light-emitting element, so that the OLED emits light after the black screen.
  • a short brightness delay is generated. These short brightness delays are used to supplement the flicker frequency caused by the inherent brightness delay of the OLED light-emitting element in the initial stage of each frame period, so that the overall observability of the flicker frequency caused by the brightness delay is reduced. , so as to achieve the effect of eliminating visual flicker.

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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)
  • Control Of El Displays (AREA)
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Abstract

一种显示装置及其驱动方法，在每个帧周期的有效发光阶段（300），对应截止信号产生的黑画面，重置OLED发光元件（11），使黑画面过后OLED发光元件（11）发光时产生短暂的亮度延迟（304），以补充OLED发光元件（11）的固有的亮度延迟（303）引起的闪烁频率，使因固有的亮度延迟（303）导致的整体闪烁频率的可观察性降低，从而消除视觉闪烁。其中，驱动方法包括：提供一显示装置，显示装置包括多个子像素，每个子像素包括OLED发光元件（11）、向OLED发光元件（11）传输驱动电流（I OLED）的发光晶体管（12）和耦接于OLED发光元件（11）的阳极的重置晶体管（13）（S210）；向发光晶体管（12）输入周期性的截止信号（S220）；确定子像素的每个帧周期的有效发光阶段（300）（S230）；在子像素的每个帧周期的有效发光阶段（300），对应一个或多个截止信号，向重置晶体管（13）输入重置信号（302）（S240）。

Description

显示装置及其驱动方法 技术领域
本发明涉及显示技术领域，具体地说，涉及一种显示装置及其驱动方法。
背景技术
OLED(Organic Light-Emitting Diode，有机发光二极管)显示装置在低帧率的显示工况下容易发生闪烁问题。闪烁问题由漏电流或迟滞电压引起，改善漏电流现有技术已有较多研究，本文主要围绕迟滞电压说明。
OLED发光元件的驱动电流I OLED由下述公式(1)产生：
I OLED＝K(V DATA-ELVDD) 2      (1)；
其中K是触点值，V DATA是数据电压，ELVDD是电源电压。OLED发光元件的亮度误差△I OLED由下述公式(2)产生：
Figure PCTCN2021100968-appb-000001
其中△V th是迟滞电压。根据公式(1)和公式(2)可知，在低灰阶下由于(V DATA-ELVDD)的值变小，在相同迟滞电压△V th的取值情况下，亮度误差会增大。因此，闪烁问题在低帧率和低灰阶的显示工况下变得尤为严重。
迟滞电压引起闪烁的原理具体是，在每个帧周期的初始阶段，由于迟滞电压的存在，导致OLED发光元件发生发光延迟现象，引起显示亮度在每个帧周期的初始阶段有一段亮度延迟。在低帧率/低灰阶的显示工况下，该段亮度延迟被人眼察觉到，产生视觉闪烁。
尤其是在使用VRR(Variable Refresh Rate，可变刷新率)技术的显示装置中，由于人眼对闪烁的敏感度随闪烁频率的减小而加重，VRR技术最低可将帧频降低至25Hz，导致极为严重的视觉闪烁。
需要说明的是，在上述背景技术部分公开的信息仅用于加强对本发明的背景的理解，因此可以包括不构成对本领域普通技术人员已知的现有技术的信息。
发明内容
有鉴于此，本发明提供一种显示装置及其驱动方法，用以解决视觉闪烁问题。
本发明的一个方面提供一种显示装置的驱动方法，包括步骤：提供一显示装置，所述显示装置包括多个子像素，每个所述子像素包括OLED发光元件、向所述OLED发光元件传输驱动电流的发光晶体管和耦接于所述OLED发光元件的阳极的重置晶体管；向所述发光晶体管输入周期性的截止信号；确定所述子像素的每个帧周期的有效发光阶段；以及，在所述子像素的每个所述帧周期的有效发光阶段，对应一个或多个所述截止信号，向所述重置晶体管输入重置信号。
在一些实施例中，确定所述子像素的每个帧周期的有效发光阶段的步骤包括：向所述重置晶体管输入周期为所述帧周期的初始重置信号；获得所述子像素响应所述初始重置信号的延迟发光时间；以及，将每个所述帧周期中，所述延迟发光时间之后的阶段作为所述有效发光阶段。
在一些实施例中，向所述重置晶体管输入重置信号的步骤中，根据所述帧周期和所述延迟发光时间确定所述重置信号的输入频次，使每个所述帧周期内，由所述延迟发光时间和所述重置信号产生的亮度延迟的频率不可见。
在一些实施例中，所述重置信号是周期性的或非周期性的脉冲信号。
在一些实施例中，所述OLED发光元件的阳极和阴极存在寄生电容，响应于所述初始重置信号，所述驱动电流流经所述OLED发光元件前，先对所述OLED发光元件的寄生电容进行充电，使所述OLED发光元件产生所述延迟发光时间。
在一些实施例中，每个所述子像素还包括用于产生所述驱动电流的驱动晶体管，所述驱动晶体管通过所述发光晶体管连向所述OLED发光元件。
本发明的另一个方面提供一种显示装置，包括排列成行列矩阵的多个子像素，每个所述子像素包括：OLED发光元件；发光晶体管，向所述OLED发光元件传输驱动电流；重置晶体管，耦接于所述OLED发光元件的阳极；其中，所述发光晶体管接收周期性的截止信号，所述OLED发光元件在每个帧周期具有有效发光阶段，所述重置晶体管在每个所述帧周期的有效发光阶段，接收对应一个或多个所述截止信号的重置信号。
在一些实施例中，所述重置晶体管还接收周期为所述帧周期的初始重置信号， 所述OLED发光元件响应所述初始重置信号产生延迟发光时间，所述有效发光阶段为每个所述帧周期中所述延迟发光时间之后的阶段。
在一些实施例中，所述重置信号的输入频次与所述帧周期和所述延迟发光时间相关，以使每个所述帧周期内，由所述延迟发光时间和所述重置信号产生的亮度延迟的频率不可见。
在一些实施例中，每个所述子像素还包括：驱动晶体管，用于产生所述驱动电流，所述驱动晶体管通过所述发光晶体管连向所述OLED发光元件。
本发明与现有技术相比的有益效果至少包括：
在每个帧周期的有效发光阶段，对应截止信号产生的黑画面，利用重置晶体管重置OLED发光元件，使黑画面过后OLED发光元件发光时产生短暂亮度延迟，该些短暂亮度延迟用于补充OLED发光元件在每个帧周期的初始阶段的固有亮度延迟引起的闪烁频率，使整体因亮度延迟导致的闪烁频率的可观察性降低，从而消除视觉闪烁。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本发明。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本发明的实施例，并与说明书一起用于解释本发明的原理。显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示出本发明实施例中显示装置的子像素的电路示意图；
图2示出本发明实施例中显示装置的驱动方法的步骤示意图；
图3示出本发明实施例中显示装置的驱动方法的场景示意图；
图4示出本发明实施例中引起延迟发光时间的时序示意图；
图5示出采用传统的驱动方法，显示装置的亮度变化曲线和闪烁可见度曲线；
图6示出采用本发明的驱动方法后，显示装置的亮度变化曲线和闪烁可见度曲线。
具体实施方式
现在将参考附图更全面地描述示例实施方式。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的实施方式。相反，提供这些实施方式使得本发明将全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。在图中相同的附图标记表示相同或类似的结构，因而将省略对它们的重复描述。
此外，附图仅为本公开的示意性图解，并非一定是按比例绘制。图中相同的附图标记表示相同或类似的部分，因而将省略对它们的重复描述。附图中所示的一些方框图是功能实体，不一定必须与物理或逻辑上独立的实体相对应。可以采用软件形式来实现这些功能实体，或在一个或多个硬件模块或集成电路中实现这些功能实体，或在不同网络和/或处理器装置和/或微控制器装置中实现这些功能实体。
下述方法实施例中的步骤序号仅用于表示不同的执行内容，并不限定步骤之间的逻辑关系和执行顺序。
图1示出实施例中显示装置的子像素的电路结构，图2示出实施例中显示装置的驱动方法的主要步骤，图3示出实施例中显示装置的驱动方法的实施场景。参照图2所示，本实施例中显示装置的驱动方法主要包括：在步骤S210中，提供一显示装置，该显示装置包括多个子像素，每个子像素的电路结构参照图1所示，包括OLED发光元件11、向OLED发光元件11传输驱动电流I OLED的发光晶体管12和耦接于OLED发光元件11的阳极的重置晶体管13；在步骤S220中，向发光晶体管输入周期性的截止信号；在步骤S230中，确定子像素的每个帧周期的有效发光阶段；以及在步骤S240中，在子像素的每个帧周期的有效发光阶段，对应一个或多个截止信号，向重置晶体管输入重置信号。
参照图3所示，信号EM是输入发光晶体管12的栅极的周期性的截止信号。本实施例中信号EM是周期性的高电平信号，用于在每个帧周期内按照一定频率产生黑画面。具体来说，结合图1和图3所示，当发光晶体管12的栅极接收到高电平信号，发光晶体管12截止，驱动电流I OLED无法经由发光晶体管12传输向OLED发光元件11，导致OLED发光元件11对应发光晶体管12的高电平阶段的亮度减为零，产生黑画面。本实施例中信号EM在一个帧周期(Frame)内包括32个高电平信号，信号EM可以以周期性脉冲信号的方式提供给发光晶体管12的栅极。本实施例中一个帧周期(Frame)例如为30Hz。
本实施例在每个帧周期的有效发光阶段，对应截止信号产生的黑画面，利用重置晶体管重置OLED发光元件，使黑画面过后OLED发光元件发光时产生短暂亮度延迟，该些短暂亮度延迟用于补充OLED发光元件在每个帧周期的初始阶段的固有亮度延迟，使整体因亮度延迟导致的闪烁频率的可观察性降低，从而消除视觉闪烁。
在一个实施例中，确定子像素的每个帧周期的有效发光阶段的步骤包括：向重置晶体管输入周期为帧周期的初始重置信号；获得子像素响应初始重置信号的延迟发光时间；以及，将每个帧周期中，延迟发光时间之后的阶段作为有效发光阶段。
结合图1和图3所示，信号Sn是重置晶体管13的栅极接收到的电平信号，信号Sn包括周期为帧周期的初始重置信号301。OLED发光元件11的阳极和阴极之间存在寄生电容C OLED，响应于初始重置信号301，驱动电流I OLED流经OLED发光元件11前，先对OLED发光元件11的寄生电容C OLED进行充电，导致OLED发光元件11产生延迟发光时间t DELAY。
具体参照图4所示的原理，在一个帧周期的初始阶段，当向重置晶体管13的栅极输入初始重置信号301，此时EM信号为高电平，OLED发光元件11不工作，重置晶体管13对OLED发光元件11的寄生电容C OLED进行放电操作，以防止对比度下降。当初始重置信号301置为高电平，EM信号置为低电平，重置过程结束，OLED发光元件11进入发光阶段。但是，由于寄生电容C OLED的存在，在发光阶段本应流经OLED发光元件11，也即从OLED发光元件11的阳极流向其阴极、使OLED发光元件11发光的驱动电流I OLED，先对寄生电容C OLED进行充电，而后才流经OLED发光元件11，使OLED发光元件11进入有效发光阶段。从而，在帧周期的初始阶段，由于寄生电容C OLED的充电过程，OLED发光元件11的发光存在一定的时间延迟，在图4中表现为OLED发光元件11的阳极电压V ANODE在帧周期的初始阶段缓慢上升至预定值，OLED发光元件11的亮度Luminance在帧周期的初始阶段存在延迟发光时间t DELAY。
延迟发光时间t DELAY具体根据下述公式(3)确定：
Figure PCTCN2021100968-appb-000002
其中V F是OLED发光元件11的正向电压降，也即OLED发光元件11的阳极 和阴极之间的，确保OLED发光元件11正常发光的电压值。
延迟发光时间t DELAY具有灰度依赖性，在高灰阶的显示工况下(驱动电流I OLED高)延迟发光时间t DELAY是个极小的值，可以忽略不计。
在图3中，延迟发光时间t DELAY带来的影响表现为在一个帧周期(Frame)的初始阶段，子像素的发光亮度存在亮度延迟303。在低灰阶和低帧频的显示工况下，该由于子像素的迟滞电压引起的固有的亮度延迟303会引起视觉闪烁。因此，本实施例在每个帧周期中，在固有的亮度延迟303之后继续插入一些短暂的亮度延迟304，以增加每个帧周期中亮度延迟的发生频率，从而降低人眼对亮度延迟导致的闪烁的敏感度，达到消除视觉闪烁的效果。
插入短暂的亮度延迟的方式，如上述步骤S240所述，在子像素的每个帧周期的有效发光阶段，向重置晶体管输入对应一个或多个截止信号的重置信号。例如，图3中示意出，在子像素的一个帧周期(Frame)的有效发光阶段300，通过信号Sn向重置晶体管输入了五个重置信号302，该五个重置信号302分别对应相间隔的五个截止信号。重置信号302可以是周期性的或非周期性的脉冲信号，其具体的输入频次根据帧周期和延迟发光时间确定，使每个帧周期内，由延迟发光时间和重置信号产生的亮度延迟的频率不可见。重置信号302与初始重置信号301同理，都是能实现OLED发光元件11的重置操作的信号。
结合图1、图3和图4所示，当重置晶体管13的栅极接收到重置信号302，重置晶体管13同样会对OLED发光元件11的寄生电容C OLED进行放电操作；当重置信号302结束、信号Sn置高、信号EM置低，则驱动电流I OLED先对寄生电容C OLED进行充电，再流经OLED发光元件11供发光。因此，OLED发光元件11在每个重置信号302之后，其发光亮度会存在一个短暂的亮度延迟304，该些短暂的亮度延迟304增加了每个帧周期内亮度延迟的总发生频率，从而降低固有的亮度延迟303引起的视觉闪烁敏感度，使每个帧周期内的整体闪烁变化从视觉角度变得不可见。
在高灰阶的显示工况下，子像素的固有的亮度延迟几乎没有，即每个帧周期的初始阶段的延迟发光时间很小，因此根据帧周期和延迟发光时间确定的重置信号的输入频次很少，从而上述的驱动方法不会对高灰阶的显示工况造成影响。同理，在高帧频的显示工况下，根据帧周期和延迟发光时间确定的重置信号的输入频次很少，从而上述的驱动方法也不会对高帧频的显示工况造成影响。
在上述的驱动方法中，一些常规的方法原理以及电路结构并未展开说明，这不应视为对本发明的限制。例如，参照图1所示，每个子像素电路都连接电源电压ELVDD和ELVSS，每个子像素电路还包括用于产生驱动电流I OLED的驱动晶体管14，驱动晶体管14通过发光晶体管12连向OLED发光元件11。
图5示出采用传统的驱动方法，显示装置的亮度变化曲线和闪烁可见度曲线，图6示出采用本发明的驱动方法后，显示装置的亮度变化曲线和闪烁可见度曲线。参照图5所示，显示装置的帧频为30Hz，灰阶例如为46。显示装置在一个帧周期的初始阶段，存在固有的亮度延迟，在亮度变化曲线5a中表现为亮度骤降501，而在该帧周期的后续阶段，其亮度变化曲线5a的走势比较平稳。在低帧频和低灰阶的显示工况下，每个帧周期的初始阶段的亮度骤降501会引起强烈的视觉感受，表现为闪烁可见度曲线5b中的尖锐上升502，导致观感不佳的视觉闪烁。
参照图6所示，同样在帧频为30Hz，灰阶为46的显示工况下，当采用上述实施例的驱动方法，在每个帧周期的有效发光阶段通过附加的重置信号插入一些短暂的亮度延迟，在亮度变化曲线6a中表现为亮度骤降601，使每个帧周期中，亮度骤降(包括一个亮度骤降501和多个亮度骤降601)的发生频率增加，从而降低视觉感受，在闪烁可见度曲线6b中对应30Hz帧频的闪烁可见度大大降低，达到消除低帧频和低灰阶的显示工况下的视觉闪烁的效果。从而，在显示装置配置VRR技术和G-SYNC技术的情况下，例如一些游戏应用中，视觉闪烁的情况得到极大改善。在60Hz以及更高的显示帧频下，闪烁可见度也不会被人眼观察到。
综上，通过上述的驱动方法，在子像素的每个帧周期的有效发光阶段，对应截止信号产生的黑画面，利用重置晶体管重置OLED发光元件，使黑画面过后OLED发光元件发光时产生短暂亮度延迟，该些短暂亮度延迟用于补充OLED发光元件在每个帧周期的初始阶段的固有亮度延迟引起的闪烁频率，使整体因亮度延迟导致的闪烁频率的可观察性降低，从而达到消除视觉闪烁的效果。
本发明实施例还提供一种显示装置，该显示包括排列成行列矩阵的多个子像素，参照图1所示，每个子像素包括：OLED发光元件11；发光晶体管12，用于向OLED发光元件11传输驱动电流I OLED；重置晶体管13，耦接于OLED发光元件11的阳极；其中，发光晶体管12的栅极接收周期性的截止信号，产生连续的黑画面；OLED发光元件11在每个帧周期具有有效发光阶段，重置晶体管13在每个帧周期的有效 发光阶段，接收对应一个或多个截止信号的重置信号，以使黑画面过后OLED发光元件11发光时产生短暂亮度延迟，该些短暂亮度延迟用于补充OLED发光元件11在每个帧周期的初始阶段的固有亮度延迟引起的闪烁频率，使整体因亮度延迟导致的闪烁频率的可观察性降低，从而达到消除视觉闪烁的效果。
每个子像素还包括驱动晶体管14，驱动晶体管14用于产生驱动电流I OLED，驱动晶体管14通过发光晶体管12连向OLED发光元件11。
进一步地，重置晶体管还接收周期为帧周期的初始重置信号，OLED发光元件响应初始重置信号产生延迟发光时间，有效发光阶段为每个帧周期中延迟发光时间之后的阶段。重置信号的输入频次具体与帧周期和延迟发光时间相关，以使每个帧周期内，由延迟发光时间和重置信号产生的亮度延迟的频率不可见。
本实施例的显示装置采用上述实施例的驱动方法进行驱动，以达到消除视觉闪烁的效果。具体的原理可参照上述实施例的说明，此处不再重复。
综上，本发明的显示装置及其驱动方法，在子像素的每个帧周期的有效发光阶段，对应截止信号产生的黑画面，利用重置晶体管重置OLED发光元件，使黑画面过后OLED发光元件发光时产生短暂亮度延迟，该些短暂亮度延迟用于补充OLED发光元件在每个帧周期的初始阶段的固有亮度延迟引起的闪烁频率，使整体因亮度延迟导致的闪烁频率的可观察性降低，从而达到消除视觉闪烁的效果。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明的保护范围。

Claims (10)

  1. 一种显示装置的驱动方法，其特征在于，包括步骤：
    提供一显示装置，所述显示装置包括多个子像素，每个所述子像素包括OLED发光元件、向所述OLED发光元件传输驱动电流的发光晶体管和耦接于所述OLED发光元件的阳极的重置晶体管；
    向所述发光晶体管输入周期性的截止信号；
    确定所述子像素的每个帧周期的有效发光阶段；以及
    在所述子像素的每个所述帧周期的有效发光阶段，对应一个或多个所述截止信号，向所述重置晶体管输入重置信号。
  2. 如权利要求1所述的驱动方法，其特征在于，确定所述子像素的每个帧周期的有效发光阶段的步骤包括：
    向所述重置晶体管输入周期为所述帧周期的初始重置信号；
    获得所述子像素响应所述初始重置信号的延迟发光时间；以及
    将每个所述帧周期中，所述延迟发光时间之后的阶段作为所述有效发光阶段。
  3. 如权利要求2所述的驱动方法，其特征在于，向所述重置晶体管输入重置信号的步骤中，根据所述帧周期和所述延迟发光时间确定所述重置信号的输入频次，使每个所述帧周期内，由所述延迟发光时间和所述重置信号产生的亮度延迟的频率不可见。
  4. 如权利要求3所述的驱动方法，其特征在于，所述重置信号是周期性的或非周期性的脉冲信号。
  5. 如权利要求2所述的驱动方法，其特征在于，所述OLED发光元件的阳极和阴极之间存在寄生电容，响应于所述初始重置信号，所述驱动电流流经所述OLED发光元件前，先对所述OLED发光元件的寄生电容进行充电，使所述OLED发光元件产生所述延迟发光时间。
  6. 如权利要求1所述的驱动方法，其特征在于，每个所述子像素还包括用于产生所述驱动电流的驱动晶体管，所述驱动晶体管通过所述发光晶体管连向所述OLED发光元件。
  7. 一种显示装置，包括排列成行列矩阵的多个子像素，其特征在于，每个所 述子像素包括：
    OLED发光元件；
    发光晶体管，向所述OLED发光元件传输驱动电流；
    重置晶体管，耦接于所述OLED发光元件的阳极；
    其中，所述发光晶体管接收周期性的截止信号，所述OLED发光元件在每个帧周期具有有效发光阶段，所述重置晶体管在每个所述帧周期的有效发光阶段，接收对应一个或多个所述截止信号的重置信号。
  8. 如权利要求7所述的显示装置，其特征在于，所述重置晶体管还接收周期为所述帧周期的初始重置信号，所述OLED发光元件响应所述初始重置信号产生延迟发光时间，所述有效发光阶段为每个所述帧周期中所述延迟发光时间之后的阶段。
  9. 如权利要求8所述的显示装置，其特征在于，所述重置信号的输入频次与所述帧周期和所述延迟发光时间相关，以使每个所述帧周期内，由所述延迟发光时间和所述重置信号产生的亮度延迟的频率不可见。
  10. 如权利要求7所述的显示装置，其特征在于，每个所述子像素还包括：
    驱动晶体管，用于产生所述驱动电流，所述驱动晶体管通过所述发光晶体管连向所述OLED发光元件。
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