US20180158398A1 - Organic light-emitting display panel, driving method and driving device therefor - Google Patents

Organic light-emitting display panel, driving method and driving device therefor Download PDF

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Publication number
US20180158398A1
US20180158398A1 US15/886,858 US201815886858A US2018158398A1 US 20180158398 A1 US20180158398 A1 US 20180158398A1 US 201815886858 A US201815886858 A US 201815886858A US 2018158398 A1 US2018158398 A1 US 2018158398A1
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Prior art keywords
duty cycle
light
target
effective pulse
pulse duty
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US15/886,858
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English (en)
Inventor
Dongxu Xiang
Yue Li
Renyuan Zhu
Yana GAO
Zhonglan Cai
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Shanghai Tianma AM OLED Co Ltd
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Shanghai Tianma AM OLED Co Ltd
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Assigned to Shanghai Tianma AM-OLED Co., Ltd. reassignment Shanghai Tianma AM-OLED Co., Ltd. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Cai, Zhonglan, GAO, YANA, LI, YUE, XIANG, DONGXU, ZHU, RENYUAN
Publication of US20180158398A1 publication Critical patent/US20180158398A1/en
Priority to US17/565,486 priority Critical patent/US11741882B2/en
Abandoned legal-status Critical Current

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    • 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
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    • 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
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    • 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
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    • 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
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    • 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]
    • G09G3/3266—Details of drivers for scan electrodes
    • H01L27/3241—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • G—PHYSICS
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • 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
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    • 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
    • G—PHYSICS
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    • 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
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    • 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
    • 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
    • G09G2300/0866—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 by means of changes in the pixel supply voltage
    • G—PHYSICS
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    • 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
    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
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    • G09G2310/0264—Details of driving circuits
    • G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
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    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Definitions

  • the present disclosure relates to display technologies, in particular to an organic light-emitting display panel, a driving method and a driving device therefor.
  • an organic light-emitting display device raises the wide concerns due to its characteristics such as self-luminance, fast response, wide viewing angle and the preparation for a flexible screen etc.
  • An organic light-emitting diode (OLED) display device is a current-driven active light-emitting display device and may be divided as a passive-matrix organic light-emitting diode (PM-OLED) display device and an active-matrix organic light-emitting diode (AM-OLED) display device based on the driving manner.
  • PM-OLED passive-matrix organic light-emitting diode
  • AM-OLED active-matrix organic light-emitting diode
  • the OLED display devices employ a shift register device to control the generation of light-emitting signals (hereinafter, referred to as EMIT), and two rows of pixels may be driven by a cascade of the shift registers device.
  • the conventional OLED display device commonly has 256-levels brightness (0-255), and the shift register device thereof commonly employs a light-emitting control timing with four pulses.
  • a time period of a frame is commonly divided into quarters, in order to enable each quarter of the time period to achieve a 256-levels brightness variation to avoid the flickers.
  • a 256-levels brightness variation in each quarter of the time period may not be achieved, that is, a jumping occurs in the brightness variation of the display device, which leads to an unsmooth brightness variation of the display device, so that the display effect of the OLED display device is affected.
  • the present disclosure provides an organic light-emitting display panel, a driving method and a driving device therefor.
  • the present disclosure provides an driving method for the organic light-emitting display panel, and the driving method includes:
  • the present disclosure provides a driving device for the organic light-emitting display panel, and the driving device includes:
  • the present disclosure provides an organic light-emitting display panel, and the organic light-emitting display panel includes the above mentioned driving device.
  • FIG. 1 is a flow diagram showing a driving method for an organic light-emitting display panel according to an embodiment of the present disclosure
  • FIG. 2 is a flow diagram showing another driving method for an organic light-emitting display panel according to an embodiment of the present disclosure
  • FIG. 3 is a diagram showing a driving device for an organic light-emitting display panel according to an embodiment of the present disclosure
  • FIG. 4 is a diagram showing an organic light-emitting display panel according to an embodiment of the present disclosure.
  • FIG. 5 is a diagram showing a pixel circuit according to an embodiment of the present disclosure.
  • FIG. 6A , FIG. 6B and FIG. 6C are the waveform graphs showing the light-emitting control signal with different brightness levels according to the embodiments of the present disclosure.
  • FIG. 1 is a flow diagram showing a driving method for an organic light-emitting display panel according to an embodiment of the present disclosure.
  • the driving method for the organic light-emitting display panel includes: Step 110 , setting a plurality of brightness levels of the organic light-emitting display panel and a plurality of maximum gray scale brightnesses, wherein each of the plurality of brightness levels corresponds to a respective one of the plurality of maximum gray scale brightnesses, the plurality of maximum gray scale brightnesses include a first maximum gray scale brightness corresponding to a maximum brightness level of the organic light-emitting display panel, and an effective pulse duty cycle of a light-emitting control signal (hereinafter, referred to as EMIT) for driving the first maximum gray scale brightness is defined as a first effective pulse duty cycle.
  • EMIT light-emitting control signal
  • the brightness level of the organic light-emitting display panel and the maximum gray scale brightness corresponding to the brightness level may need be set before the organic light-emitting display panels leave the factory. Since the light-emitting organic display panels in the prior art generally employ an 8-bits shift register to control the pixels to emit light, the light-emitting organic display panel of this embodiment may have a 256-levels brightness (0-255), and each brightness level is configured to have a minimum gray scale brightness and a maximum gray scale brightness. The minimum gray scale brightness of each brightness level is zero, and different brightness levels have different maximum gray brightness thereof, so that the higher the brightness level is, the higher the maximum gray scale brightness corresponding to the brightness level is.
  • the maximum gray scale brightness corresponding to the maximum brightness level of the organic light-emitting display panel has a maximum brightness of the organic light-emitting display panel, Therefore, the maximum gray scale brightness corresponding to the maximum brightness level of the organic light-emitting display panel is defined as a first maximum gray scale brightness.
  • the brightness of each brightness level of the organic light-emitting display panel in this embodiment may be divided into a 256-levels gray scale (0-255). Therefore, for any of brightness levels of the organic light-emitting display panel, the 255-th-level gray scale brightness corresponding to the brightness level has the maximum gray scale brightness of the brightness level. For example, the maximum gray scale brightness corresponding to the 240-th-level brightness is 350 nit, and the maximum gray scale brightness corresponding to the 255-th-level brightness is 400 nit.
  • a plurality of brightness levels of the organic light-emitting display panel and the maximum gray scale brightness corresponding to each of the brightness levels are set before the organic light-emitting display panels leaves the factory.
  • the inputted voltage potential of a gate electrode of a thin film transistor (TFT) for driving an organic light-emitting diode (OLED) may be adjusted by adjusting the data signal voltage, so that the gate-source voltage of the TFT is changed, thereby controlling the magnitude of the current flowing through the OLED, which in turn changes the luminous intensity of the OLED.
  • the data signal voltage corresponding to a gray scale level of the brightness level may be determined, that is, when the brightness level of the organic light-emitting display panel is determined, the desired gray level of each pixel may be achieved by adjusting the data signal voltage.
  • the effective pulse of the EMIT is configured to control the at least one row of corresponding sub-pixels to emit light
  • the organic light-emitting display panel includes a plurality of light-emitting control lines, a light-emitting control line corresponds to and is electrically connected to at least one row of the corresponding sub-pixels, and hence the EMIT outputted by the light-emitting control line controls at least one row of corresponding sub-pixels to emit light.
  • the EMIT is configured to control the turning on and off of each light-emitting control transistor for driving the OLED in the at least a row of pixel circuits corresponding thereto.
  • the EMIT turns on the light-emitting transistor, the OLED emits light.
  • the EMIT turns off the light-emitting transistor, the OLED does not emit light. Therefore, the EMIT can control the light-emitting time period of the OLED, the longer of the light-emitting time period is, the higher brightness of the OLED is.
  • the EMIT may change the brightness level of the OLED by adjusting the length of the light-emitting time period.
  • the pulse of the EMIT for controlling the turning on of the light-emitting control transistor is defined as an effective pulse.
  • the pulse of the EMIT for controlling the turning off of the light-emitting control transistor is defined as an ineffective pulse.
  • the ratio of the effective pulse duration of a light-emitting control cycle to the light-emitting control cycle is defined as an effective pulse duty cycle.
  • the effective pulse duty cycle of the EMIT for driving the first maximum gray scale brightness is defined as a first effective pulse duty cycle.
  • the effective pulse duty cycle of the EMIT for driving other gray scale brightness is certainly less than the first effective pulse duty cycle.
  • the effective pulse of the EMIT is configured to control the adjacent two rows of sub-pixels to emit light. That is, the organic light-emitting display panel includes a plurality of light-emitting control lines, and each of the light-emitting control lines is electrically connected to adjacent two rows of sub-pixels. In other embodiments, the effective pulse of the EMIT is also configured to control the adjacent four rows of sub-pixels to emit light.
  • an output waveform of the EMIT includes a plurality of effective pulses and ineffective pulses.
  • different organic light-emitting display panels may have different light-emitting control circuits, so that the number of brightness levels for different organic light-emitting display panels may be different.
  • the number of brightness levels of the organic light-emitting display panel is not limited in the present disclosure.
  • Step 120 when a picture in the organic light-emitting display panel is controlled to be switched, a target brightness level of the switched picture and a target maximum gray scale brightness corresponding to the target brightness level are determined.
  • a target brightness level of the switched picture may need be determined by the organic light-emitting display panel. It should be noted that, if the user does not adjust the brightness level of the organic light-emitting display panel, the target brightness level of the switched picture conforms with brightness level of the picture of current frame; if the user adjusts the brightness level of the organic light-emitting display panel, the adjusted brightness level is the target brightness level of the switched picture.
  • the target maximum gray scale brightness of the switched picture may be determined.
  • Step 130 based on the target maximum gray scale brightness of the switched picture, the first maximum gray scale brightness and the first effective pulse duty cycle, the target effective pulse duty cycle of the EMIT for driving the switched picture is adjusted.
  • the EMIT since the EMIT may change the brightness level of the OLED by adjusting the length of the light-emitting time period of the OLED, and the first maximum gray scale brightness and the first effective pulse duty cycle are given, when the picture of the organic light-emitting display panel is switched, the target effective pulse duty cycle of the EMIT for driving the switched picture may be adjusted based on the determined target maximum gray scale brightness of the switched picture, thereby enabling the switch picture to reach a target maximum gray scale brightness.
  • the duty cycle ratio of the target effective pulse duty cycle to first effective pulse duty cycle is determined as the brightness ratio of the target maximum gray scale brightness to the first maximum gray scale brightness, thereby computing the target effective pulse duty cycle.
  • the display brightness of the switched picture is just the target maximum gray scale brightness.
  • the gray scales of different sub-pixels for the picture of a frame may be different.
  • the data signal voltage outputted to each sub-pixel may be adjusted for the organic light-emitting display panel, thereby enabling each sub-pixel of the picture of a frame to display the corresponding gray scale.
  • the organic light-emitting display panel provided in present disclosure may achieve a smooth adjustment of 0-255 gray scales within a brightness level by adjusting the data signal voltage.
  • the organic light-emitting display panel it is preset in the organic light-emitting display panel a plurality of brightness levels, the maximum gray scale brightness corresponding to each of the brightness level, the first maximum gray scale brightness corresponding to the maximum brightness level and the first effective pulse duty cycle of the EMIT for driving the first maximum gray scale brightness.
  • a target brightness level is enabled to be adjusted in the organic light-emitting display panel.
  • the display time period of the organic light-emitting display panel can be adjusted by adjusting the effective pulse duty cycle of the organic light-emitting display panel, thereby adjusting the total brightness of the organic light-emitting display panel.
  • the driving method for the organic light-emitting display panel may also achieve the smooth adjustment of the brightness of the organic light-emitting display panel and improve the display effect of the organic light-emitting display panel.
  • adjusting the target effective pulse duty cycle of the EMIT for driving the switched picture in above mentioned step 130 includes: Step 131 , calculating a target ratio of the target maximum gray scale brightness to the first maximum gray scale brightness; and Step 132 , adjusting the target effective pulse duty cycle of the EMIT for driving the switched picture, so that the ratio of the target effective pulse duty cycle to the first effective pulse duty cycle is equal to the target ratio.
  • the EMIT since the EMIT may change the brightness level of the OLED by adjusting the time period of data signal voltage inputted to the OLED, and the first maximum gray scale brightness and the corresponding first effective pulse duty cycle are given, when controlling the switching of pictures of the organic light-emitting display panel, the target effective pulse duty cycle of the EMIT may be adjusted for driving the switched picture based on the determined target maximum gray scale brightness of the switched picture, thereby enabling the switch picture to reach a target maximum gray scale brightness.
  • a target ratio is obtained by calculating a brightness ratio of the target maximum gray scale brightness to the first maximum gray scale brightness, and then the target effective pulse duty cycle of the EMIT for driving the switched picture is adjusted, thereby enabling the ratio of the target effective pulse duty cycle to the first effective pulse duty cycle to be equal to a target ratio.
  • the driving for the organic light-emitting display panel is controlled according to the adjusted EMIT, and thus the display brightness of the switched picture is just the target maximum gray scale brightness.
  • adjusting the target effective pulse duty cycle of the EMIT for driving the switched picture in step 130 includes: decreasing gradually, when the target effective pulse duty cycle of the EMIT for driving the switched picture is less than the target effective pulse duty cycle of the EMIT for driving the preceding picture of the frame, the target effective pulse duty cycle until the ratio of the target effective pulse duty cycle to the first effective pulse duty cycle is equal to the target ratio.
  • the target effective pulse duty cycle of the EMIT after switched is less than that of the EMIT before switched, it indicates that the brightness of the switched picture is lower than that of the picture before switched. Based on the case that the brightness becomes lower before and after the picture switching, the target effective pulse duty cycle of the EMIT for driving the switched picture is decreased. That is, the width of each ineffective pulse is adjusted individually until the ratio of the target effective pulse duty cycle of the EMIT for driving the switched picture to the first effective pulse duty cycle is equal to the target ratio. Therefore, the display time period of the organic light-emitting display panel is reduced, so that the brightness is decreased.
  • an output waveform of the EMIT includes a plurality of effective pulses and a plurality of ineffective pulses. If the effective pulse duty cycles of the EMIT before and after picture switching are almost same, the target effective pulse duty cycle may be adjusted individually so as to achieve the fine-tuning on the brightness of the organic light-emitting display panel. If the effective pulse duty cycles of the EMIT before and after picture switching are largely different, the width of a plurality of ineffective pulse may be adjusted so as to achieve the fast-tuning on the brightness of the organic light-emitting display panel.
  • adjusting the target effective pulse duty cycle of the EMIT for driving the switched picture in step 130 includes: increasing gradually, when the target effective pulse duty cycle of the EMIT for driving the switched picture is larger than the target effective pulse duty cycle of the EMIT for driving the preceding picture of the frame, the target effective pulse duty cycle until the ratio of the target effective pulse duty cycle to the first effective pulse duty cycle is equal to the target ratio.
  • the target effective pulse duty cycle of the EMIT after switched is larger than that of the EMIT before switched, it indicates that the brightness of the switched picture is higher than that of the picture before switched. In the case that the brightness becomes higher before and after the picture switching, the target effective pulse duty cycle of the EMIT for driving the switched picture is increased. That is, the width of each ineffective pulse is adjusted individually until the ratio of the target effective pulse duty cycle of the EMIT for driving the switched picture to the first effective pulse duty cycle is equal to the target ratio. Therefore, the display time period of the organic light-emitting display panel is increased and the brightness is improved.
  • the target effective pulse duty cycle may be adjusted so as to achieve the adjustment to the brightness of the organic light-emitting display panel.
  • the present disclosure further provides a driving device of the organic light-emitting display panel. Since the principle of the driving device for solving the problems is similar to that of the driving method of the organic light-emitting display panel, the operations of the driving device may refer to that of the driving method and do not discuss again here.
  • a driving device of the organic light-emitting display panel includes: a display brightness determining device 210 and a display brightness adjusting device 220 .
  • the display brightness determining device 210 is configured to determine, when controlling the picture switching of the organic light-emitting display panel, the target brightness level of the switched picture and the target maximum gray scale brightness corresponding to the target brightness level.
  • the display brightness adjusting device 220 is configured to adjust the target effective pulse duty cycle of the EMIT for driving the switched picture on the basis of the target maximum gray scale brightness of the switched picture, the first maximum gray scale brightness and a first effective pulse duty cycle.
  • the maximum gray scale brightness corresponding to the maximum brightness level of the organic light-emitting display panel is defined as a first maximum gray scale brightness
  • the effective pulse duty cycle of the EMIT for driving the first maximum gray scale brightness is defined as a first effective pulse duty cycle.
  • the effective pulse of the EMIT is configured to control at least one row of sub-pixels to emit light.
  • the effective pulse of the EMIT is configured to control the adjacent four rows of sub-pixels to emit light.
  • an output waveform of the EMIT includes a plurality of effective pulses and ineffective pulses.
  • the display brightness adjusting device 220 includes: a brightness calculating device 221 and a pulse adjusting device 222 .
  • the brightness calculating device 221 is configured to calculate a target ratio of the target maximum gray scale brightness to the first maximum gray scale brightness; the pulse adjusting device 222 is configured to adjust the target effective pulse duty cycle of the EMIT for driving the switched picture, thereby enabling the ratio of the target effective pulse duty cycle to the first effective pulse duty cycle to be equal to a target ratio.
  • the implementation process for the display brightness adjusting device 220 includes: decreasing gradually, when the target effective pulse duty cycle of the EMIT for driving the switched picture is less than the target effective pulse duty cycle of the EMIT for driving the preceding picture of the frame, the target effective pulse duty cycle of the EMIT until the ratio of the target effective pulse duty cycle to the first effective pulse duty cycle is equal to the target ratio.
  • the implementation process for the display brightness adjusting device 220 includes: increasing gradually, when the target effective pulse duty cycle of the EMIT for driving the switched picture is larger than the target effective pulse duty cycle of the EMIT for driving the preceding picture of the frame, the target effective pulse duty cycle of the EMIT until the ratio of the target effective pulse duty cycle to the first effective pulse duty cycle equal to the target ratio.
  • the display time period of the organic light-emitting display panel is adjusted by adjusting the effective pulse duty cycle of the organic light-emitting display panel, thereby adjusting the total brightness of the organic light-emitting display panel.
  • the driving method for the organic light-emitting display panel may also achieve the smooth adjustment of the brightness of the organic light-emitting display panel and improve the display effect of the organic light-emitting display panel.
  • the present disclosure further provides a driving device of the organic light-emitting display panel and the driving device according to any above mentioned embodiments is integrated into the organic light-emitting display panel.
  • the driving device is configured to solve the driving method according to any above mentioned embodiments and no repetitions here.
  • the organic light-emitting display panel shown in FIG. 4 includes the driving device according to above embodiments.
  • the driving device includes: a plurality of light-emitting control lines 310 , and a light-emitting control line 310 is correspond to and is electrically connected to at least a row of sub-pixels (not shown in drawings); multiple cascades of shift register devices 320 , and the multiple cascaded of shift register devices 320 correspond to and are electrically connected to the plurality of light-emitting control lines, respectively, a cascade of the shift register devices 320 is configured to provide a EMIT to a corresponding light-emitting control line 310 .
  • the organic light-emitting display panel includes a display region AA, and sub-pixels with array distribution are disposed in the display region AA.
  • the organic light-emitting display panel further includes a non-display region surround the display region AA, and a driving device is provided in the non-display region.
  • Each sub-pixel is controlled by a corresponding pixel circuit, as shown in FIG. 5 , the pixel circuit includes a light-emitting control transistor M 1 and a light-emitting control transistor M 7 for driving the OLED.
  • a light-emitting control line 310 is configured to correspond to and is electrically connected to at least a row of sub-pixels, which indicates that a light-emitting control line 310 is connected to the gate electrode of the light-emitting control transistor in the pixel circuit of at least a row of sub-pixels, and an EMIT is transmitted to the gate electrode of the light-emitting control transistor via the light-emitting control line 310 .
  • the driving device further includes: multiple cascades of shift register devices 320 , the multiple cascades of shift register devices 320 are configured to be correspond to and electrically connected to the plurality of light-emitting control lines 310 .
  • each of the cascades of the multiple cascades of shift register devices 320 is configured to provide a EMIT to a corresponding light-emitting control line 310 .
  • the driving device of the organic light-emitting display panel further includes a light-emitting driving chip 330 , the light-emitting driving chip 330 is configured to apply a shift trigger signal (IN) to the first cascade of shift register devices 320 , and the light-emitting driving chip 330 is also configured to apply a clock signal to each of the cascades of shift register devices 320 .
  • the waveform of the IN outputted by the light-emitting driving chip 330 is same with that of the EMIT, with the merely difference in phases.
  • the shift registers device 320 outputs the EMIT on basis of the shift trigger signal IN outputted by the driving chip 330 .
  • the brightness level of the organic light-emitting display panel may adjusted by adjusting the waveform of the shift trigger signal IN by the light-emitting driving chip 330 .
  • the light-emitting driving chip 330 of the driving device may determine the brightness level of the switched picture and maximum gray scale brightness. Since the maximum brightness level, the first maximum gray scale brightness corresponding to the maximum brightness level and the first effective pulse duty cycle are known to the light-emitting driving chip 330 , the effective pulse duty cycle of the EMIT of driving the switched picture may be calculated by the light-emitting driving chip 330 , and the adjusted EMIT is outputted by adjusting the IN of the EMIT and the multiple cascades of shift register devices 320 based on the calculated effective pulse duty cycle of the EMIT of driving the switched picture.
  • the organic light-emitting display panel provided by this embodiment has a dimming mode and provides a driving timing for changing the brightness of the organic light-emitting display panel under the dimming mode, and the dimming mode may improve the problems of defective display in the organic light-emitting display panel.
  • the display time period of the organic light-emitting display panel can be adjusted by adjusting the width of the effective pulse duty cycle of the EMIT outputted by the shift registers device 320 , thereby adjusting the brightness of the organic light-emitting display panel.
  • the driving device may achieve a desired effective pulse duty cycle by adjusting the width of each pulse of the EMIT, in order to achieve the adjustment for the picture of a frame; and the driving device may also achieve the adjustment of the gray scales for different sub-pixels in the picture of a frame by adjusting the data signal voltage.
  • a display stage of the organic light-emitting display panel includes an initial stage, a data-writing stage and a light emission stage.
  • the operating timings of the initial stage and the data-writing stage in the organic light-emitting display panel are similar to the related technologies and no repetitions here.
  • the EMIT of the organic light-emitting display panel in the light emission stage includes two pulses; S 1 is an initial control line, and the organic light-emitting display panel is in the initial stage when S 1 outputs the low level pulses; S 2 is a data-writing control line, and the organic light-emitting display panel is in the data-writing stage when S 2 outputs the low level pulses.
  • E[ 1 ] is the a first light-emitting control line
  • S 1 [ 1 ] is a first initial control line
  • S 2 [ 1 ] is a first data-writing control line and the like.
  • FIG. 6A shows a waveform of the maximum gray scale brightness corresponding to the 255-th-level brightness of the organic light-emitting display panel, and a high level pulse is the ineffective pulse, and a low level pulse is the effective pulse.
  • the driving device of the organic light-emitting display panel may decrease the brightness level of the organic light-emitting display panel by decreasing the target effective pulse duty cycle of the EMIT. For example, if the brightness level of the organic light-emitting display panel may need to be decreased to the 254-th-level brightness, the brightness level of the organic light-emitting display panel may be decreased by increasing the width of the second ineffective pulse of the EMIT. The specific increased time period may be determined and adjusted according to the maximum gray scale brightness corresponding to the 254-th-level brightness.
  • the driving device of the organic light-emitting display panel may decrease the brightness level of the organic light-emitting display panel by decreasing the target effective pulse duty cycle of the EMIT. For example, if the brightness level of the organic light-emitting display panel may need to be decreased to the 253-th-level brightness, the brightness level of the organic light-emitting display panel may be decreased by increasing the width of the second ineffective pulse of the EMIT. The specific increased time period may be determined and adjusted according to the maximum gray scale brightness corresponding to the 253-th-level brightness.
  • the driving device provides a novel driving timing in the light emission stage of the organic light-emitting display panel, so that the adjustment to the display time period of the organic light-emitting display panel is achieved, and hence adjusting the display brightness of the organic light-emitting display panel.

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  • Control Of El Displays (AREA)
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