CN114023258A - Display panel driving method and display device - Google Patents

Display panel driving method and display device Download PDF

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Publication number
CN114023258A
CN114023258A CN202111386860.XA CN202111386860A CN114023258A CN 114023258 A CN114023258 A CN 114023258A CN 202111386860 A CN202111386860 A CN 202111386860A CN 114023258 A CN114023258 A CN 114023258A
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light emitting
emitting device
current
display
frames
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CN114023258B (en
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张秦源
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Wuhan Tianma Microelectronics Co Ltd
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Wuhan Tianma Microelectronics Co Ltd
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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]
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source

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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)
  • Electroluminescent Light Sources (AREA)

Abstract

The embodiment of the invention provides a display panel driving method and a display device. The display panel includes a plurality of light emitting devices; the driving method comprises the following steps: controlling the light-emitting device to display the target brightness, wherein the driving of the light-emitting device to display in continuous N frames is carried out, the display panel is refreshed once and recorded as one frame, N is an integer and is more than or equal to 2; wherein a high light emitting current is supplied to the light emitting device in n frames, and a low light emitting current is supplied to the light emitting device in m frames; the high luminous current is larger than the target luminous current, the low luminous current is smaller than the target luminous current, the target luminous current is the current required by the luminous device when the target brightness is displayed, N and m are positive integers, and N + m is smaller than or equal to N. The invention can meet the requirement of higher color depth, and the display picture is more exquisite.

Description

Display panel driving method and display device
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method of a display panel and a display device.
Background
The color depth is also referred to as a color bit depth, and is a unit of the number of colors of the digital image expressed by a bit number. The higher the bit number, the higher the color depth value, and the more colors the image can represent. The color depth ratio is, for example, 8bit, 10bit, or 12 bit. A common 8bit is 2 to the power of 8, which is 256, i.e. a common color display capable of displaying 256 gray levels. And 10 bits is 2 power 10 ═ 1024, which is equivalent to displaying 1024 gray levels.
In the organic self-luminous display technology, gray scale brightness displayed by a light emitting device is controlled by controlling the magnitude of light emitting current supplied to the light emitting device. At present, when the brightness is lower, the difference of the luminous current between the adjacent two gray scale brightness is smaller, so that the brightness control is more difficult, and the requirement of displaying higher color depth cannot be met.
Disclosure of Invention
The embodiment of the invention provides a driving method of a display panel and a display device, and aims to solve the technical problems that in the prior art, the adjustment precision of a luminous current is limited, and higher color depth cannot be displayed.
In a first aspect, embodiments of the present invention provide a method for driving a display panel, where the display panel includes a plurality of light emitting devices; the driving method comprises the following steps:
controlling the light-emitting device to display the target brightness, wherein the driving of the light-emitting device to display in continuous N frames is carried out, the display panel is refreshed once and recorded as one frame, N is an integer and is more than or equal to 2; wherein the content of the first and second substances,
supplying a high light emitting current to the light emitting device in n frames, and supplying a low light emitting current to the light emitting device in m frames; the high luminous current is larger than the target luminous current, the low luminous current is smaller than the target luminous current, the target luminous current is the current required by the luminous device when the target brightness is displayed, N and m are positive integers, and N + m is smaller than or equal to N.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes a display panel, and the display panel can be driven by using the driving method provided in any embodiment of the present invention.
The driving method of the display panel and the display device provided by the embodiment of the invention have the following beneficial effects: and driving the light emitting device to display in at least two continuous frames so as to control the light emitting device to display the target brightness. Wherein, in at least one frame, a high luminous current larger than the target luminous current is provided for the luminous device, and then the luminous brightness of the luminous device in at least one frame is larger than the target brightness; and simultaneously supplying a low light emitting current smaller than the target light emitting current to the light emitting device in at least one frame, so that the light emitting brightness of the light emitting device is smaller than the target brightness in at least one frame. By designing the high luminous current and the low luminous current, the aim that the brightness displayed by the luminous device is observed by human eyes as target brightness when at least two continuous frames are displayed can be realized. By adopting the driving method provided by the embodiment of the invention, the change of the display gray scale can be realized by adjusting the magnitude of the luminous current in a more flexible way under the condition that the adjustable precision of the luminous current is not changed, the requirement of higher color depth can be realized, and the display picture is more exquisite.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a flowchart of a driving method of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a prior art method for controlling a light emitting device to display a target luminance in N consecutive frames;
fig. 3 is a schematic diagram illustrating a driving method of a light emitting device according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a driving method of a light emitting device according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of another driving method according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a driving method of the light emitting device provided in fig. 5;
FIG. 7 is a schematic diagram of another driving method according to an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating a driving method of the light emitting device provided in fig. 7;
fig. 9 is a schematic diagram illustrating a driving method of a light emitting device according to another embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a driving method of a light emitting device according to another embodiment of the present invention;
FIG. 11 is a flow chart of another driving method provided by the embodiment of the invention;
fig. 12 is a schematic view of a display panel according to an embodiment of the invention;
FIG. 13 is a flow chart of another driving method provided by the embodiment of the invention;
FIG. 14 is a schematic view of another display panel according to an embodiment of the present invention;
FIG. 15 is a flow chart of another driving method provided by the embodiment of the invention;
fig. 16 is a schematic view of a display device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In order to realize higher color depth, the light emitting current of the light emitting device needs to be divided more finely, and the corresponding light emitting current difference between two adjacent gray-scale luminances is smaller. Under the condition that the adjustable precision of the driving module to the luminous current is limited, when the corresponding luminous current difference value between two adjacent gray scale brightnesses is smaller than the adjustable precision of the luminous current, the required gray scale brightness adjustment cannot be met, and the number of gray scales which can be displayed by the luminous device is limited. That is to say, the prior art cannot increase the number of displayable gray scales of the light emitting device and realize the display with higher color depth under the condition that the adjustable accuracy of the light emitting current is not changed.
Based on the problems in the prior art, embodiments of the present invention provide a driving method for a display panel, when a light emitting device needs to display a target luminance, the light emitting device displays the target luminance by adjusting a light emitting current of the light emitting device during continuous display of at least two frames. The light-emitting current provided to the light-emitting device in at least one frame is controlled to be larger than the current corresponding to the target brightness, and the light-emitting current provided to the light-emitting device in at least one frame is controlled to be smaller than the current corresponding to the target brightness, so that when multiple frames of pictures are continuously refreshed, the brightness displayed by the light-emitting device and observed by human eyes is the target brightness. The driving method provided by the embodiment of the invention can adjust the magnitude of the luminous current in a more flexible way to realize the change of the display gray scale, can realize the requirement of higher color depth, and enables the display picture to be finer and smoother.
Embodiments of the present invention provide a display panel including a plurality of light emitting devices and a plurality of pixel circuits, where the pixel circuits are configured to supply a light emitting current (which may also be referred to as a driving current) to the light emitting devices to drive the light emitting devices to emit light. The light emitting device is an organic light emitting diode or an inorganic light emitting diode. When the display panel is driven to display, the display panel is refreshed once and is recorded as one frame. That is, all the light emitting devices in the display panel are lit once for one frame. In one frame display, according to the data information of the picture to be displayed, the plurality of light-emitting devices are controlled to respectively display respective target brightness so as to realize picture display.
Fig. 1 is a flowchart of a driving method of a display panel according to an embodiment of the present invention, and as shown in fig. 1, the driving method includes:
step S101: controlling the light-emitting device to display the target brightness, wherein the driving of the light-emitting device to display in continuous N frames is carried out, the display panel is refreshed once and recorded as one frame, N is an integer and is more than or equal to 2; wherein a high light emitting current is supplied to the light emitting device in n frames, and a low light emitting current is supplied to the light emitting device in m frames; the high luminous current is larger than the target luminous current, the low luminous current is smaller than the target luminous current, the target luminous current is the current required by the luminous device when the target brightness is displayed, N and m are positive integers, and N + m is smaller than or equal to N.
The target brightness of the light-emitting device is the brightness required to be displayed by the light-emitting device when the display panel displays a picture. And each light-emitting device corresponds to the target brightness of the picture to be displayed of the display panel. The data information of the picture to be displayed of the display panel comprises the brightness information of a plurality of light-emitting devices, and the corresponding light-emitting devices are driven according to the brightness information so as to realize picture display.
In the embodiment of the invention, when the light emitting device is driven to display in N continuous frames, the light emitting current is continuously supplied to the light emitting device for N times. Of the N light emission currents, a light emission current having a current value larger than a target light emission current is defined as a high light emission current, and a light emission current having a current value smaller than the target light emission current is defined as a low light emission current. When the light emitting device is controlled to display a target luminance, when high light emitting currents of two or more numbers are supplied to the light emitting device, the magnitudes of the high light emitting currents may be the same or different. When the light emitting device is controlled to display a target luminance, the magnitude of the low light emitting current may be the same or different when the light emitting device is supplied with the low light emitting current twice or more.
In a conventional driving method, a target light emitting current is supplied to a light emitting device in one frame to control the light emitting device to display a target luminance, wherein the target light emitting current and the target luminance correspond one to one. Fig. 2 is a schematic diagram illustrating a principle of controlling a light emitting device to display a target luminance in N consecutive frames in the prior art. Taking N-4 as an example, as shown in fig. 2, in a continuous 4-frame display, the light emitting current supplied to the light emitting device in each frame is the light emitting current I0Luminous current I0I.e. the target light emission current.
Fig. 3 is a schematic diagram illustrating a driving principle of a light emitting device in a driving method according to an embodiment of the present invention. Also taking N-4 as an example, as shown in fig. 3, in the continuous 4-frame display, a high light emission current I is supplied to the light emitting device in the 1 st frame and the 3 rd frameHSupplying a low light emitting current I to the light emitting device in frames 2 and 4L. High luminous current IHCurrent value of greater than I0Low, lowLuminous current ILCurrent value of less than I0. In the driving method provided in the embodiment of fig. 3, n is 2 and m is 2. In the continuous 4-frame display, the light emitting device alternately displays higher luminance and lower luminance, wherein the higher luminance has a luminance greater than the target luminance and the lower luminance has a luminance less than the target luminance. The display effect viewed by human eyes is that the light emitting device displays the target brightness. Illustrated schematically in fig. 3 as n-m, in some embodiments n and m are not equal.
With the luminous current I illustrated in FIG. 3HLuminescence current I0And a light emitting current ILThe current with the sequentially changed magnitude can be provided under the condition of meeting the adjustable precision of the luminous current. That is, the light emission current is adjusted to be smaller than the light emission current I due to the limitation of the adjustable accuracy of the light emission currentHWhen the current value of the LED is the minimum, only the luminous current I can be adjusted0Adjusted to be less than the light emission current I0When the current value of the LED is the minimum, only the luminous current I can be adjustedL. In other words, the prior art cannot provide the current level at IHAnd I0Between the two electrodes, and cannot supply current of I0And ILThe light emitting current in between. The light emitting device cannot display the intermediate IHAnd I0Gray scale brightness corresponding to the light emitting current between I and II can not be displayed0And ILGray scale brightness corresponding to the light emitting current between.
Fig. 4 is a schematic diagram illustrating a principle of driving a light emitting device in another driving method according to an embodiment of the present invention, where a light emitting current is adjusted based on the driving method provided in fig. 3 to reduce the magnitude of the light emitting current provided to the light emitting device in frame 1. As shown in FIG. 4, in 4 consecutive frames, a light emitting current I is supplied to the light emitting device at the 1 st frame0Supplying a light emitting current I to the light emitting device at frame 2LSupplying a light emitting current I to the light emitting device at frame 3HSupplying a light emitting current I to the light emitting device at frame 4L. The light emitting device alternately displays higher brightness and lower brightness in continuous 4-frame display, and the human eyes finally view the displayThe light emitting device displays gray scale brightness corresponding to the light emitting current I'. The size of I' is between I0And ILIn the meantime.
In the driving method provided in the embodiment of fig. 4, the light emitting current I 'corresponds to a target light emitting current, and the target luminance is a luminance corresponding to the light emitting current I'. And a light emitting current I0And a luminous current IHAre all high luminous current, luminous current IHIs a low light emitting current. The driving method provided by the embodiment of the invention can realize that the display of the light-emitting device is controlled to be between I0And ILThe gray scale brightness corresponding to the light emitting current between the light emitting devices can increase the number of displayable gray scales of the light emitting devices and realize the display of higher color depth.
The driving method provided by the embodiment of the invention controls the light emitting device to display the target brightness by driving the light emitting device to display in at least two continuous frames. Wherein, in at least one frame, a high luminous current larger than the target luminous current is provided for the luminous device, and then the luminous brightness of the luminous device in at least one frame is larger than the target brightness; and simultaneously supplying a low light emitting current smaller than the target light emitting current to the light emitting device in at least one frame, so that the light emitting brightness of the light emitting device is smaller than the target brightness in at least one frame. By designing the high luminous current and the low luminous current, the aim that the brightness displayed by the luminous device is observed by human eyes as target brightness when at least two continuous frames are displayed can be realized. By adopting the driving method provided by the embodiment of the invention, the change of the display gray scale can be realized by adjusting the magnitude of the luminous current in a more flexible way under the condition that the adjustable precision of the luminous current is not changed, the requirement of higher color depth can be realized, and the display picture is more exquisite.
In some embodiments, the embodiment of the invention provides an implementation manner of adjusting the magnitude of the light emitting current to realize the change of the display gray scale. In the embodiment of the present invention, the step S101 of controlling the light emitting device to display the target luminance includes: and respectively driving the light emitting devices to display a first target brightness and a second target brightness, wherein the first target brightness is greater than the second target brightness. Fig. 5 is a schematic diagram of another driving method provided in an embodiment of the present invention, and fig. 6 is a schematic diagram of a principle of driving a light emitting device in the driving method provided in fig. 5.
As shown in fig. 5, the specific driving method includes:
step S1011: driving the light emitting device to display in N consecutive frames to control the light emitting device to display a first target brightness; wherein a high light emission current is supplied to the light emitting device in n frames and a low light emission current is supplied to the light emitting device in m frames; and supplying a first high light emitting current to the light emitting device for at least one frame among the n frames. In some embodiments, N is 1, and the first high light emitting current is supplied to the light emitting device in one of the N frames. In some embodiments, n ≧ 2, the high light emission currents provided to the light-emitting devices in the n frames may be the same or different, wherein the first high light emission current is provided to the light-emitting device in at least one frame.
As can be known from the above description in step S101, the first target luminance corresponds to a first target light emitting current, and the first target light emitting current is a current required by the light emitting device to display the first target luminance. When the light emitting devices are driven to display the first target brightness, the current values of the high light emitting currents supplied to the light emitting devices are all larger than the first target light emitting current, and the current values of the low light emitting currents supplied to the light emitting devices are all smaller than the first target light emitting current.
Step S1012: driving the light emitting device to display in N consecutive frames to control the light emitting device to display a second target brightness; wherein a high light emission current is supplied to the light emitting device in n frames and a low light emission current is supplied to the light emitting device in m frames; and a maximum value of the high light emission current supplied to the light emitting device in the n frames is less than the first high light emission current. In some embodiments, n is 1, and the high light emitting current supplied to the light emitting device in one frame is less than the first high light emitting current. In some embodiments, n is greater than or equal to 2, the high light emitting currents provided to the light emitting devices in n frames may be the same or different, and the current values of the high light emitting currents are all smaller than the first high light emitting current.
As can be understood from the above description in step S101, the second target luminance corresponds to the second target light-emitting current. When the light emitting devices are driven to display the second target brightness, the current values of the high light emitting currents supplied to the light emitting devices are all larger than the second target light emitting current, and the current values of the low light emitting currents supplied to the light emitting devices are all smaller than the second target light emitting current.
As shown in fig. 6, for example, N-4 and N-m-2, the light emitting current provided to the light emitting device in 4 consecutive frames as shown in fig. 6(a) can control the light emitting device to display the first target luminance, and the light emitting current provided to the light emitting device in 4 consecutive frames as shown in fig. 6(b) can control the light emitting device to display the second target luminance. Wherein the current value I of the light-emitting current1>I2>I01>I02>I3。
The light emitting current required for the light emitting device to display the first target luminance in one frame is I01. In contrast, as illustrated in fig. 6(a), when the light emitting device is driven to display the first target luminance, the light emitting currents supplied to the light emitting device in 4 consecutive frames are sequentially: i is1、I3、I2、I3. Wherein, I1And I2Relative to I01I.e. high luminous current, I3Relative to I01I.e. a low light emission current.
The light emitting current required for the light emitting device to display the second target luminance in one frame is I02. In contrast, as illustrated in fig. 6(b), when the light emitting device is driven to display the second target luminance, the light emitting currents supplied to the light emitting device in 4 consecutive frames are sequentially: i is2、I3、I2、I3. Wherein, I2Relative to I02I.e. high luminous current, I3Relative to I02I.e. a low light emission current.
Comparing fig. 6(a) and fig. 6(b), the light emission current I1I.e., a first high light emitting current used in driving the light emitting device to display a first target brightness. The high light emitting currents used in driving the light emitting device to display the second target luminance are all smaller than the first high light emitting current. Low light emitting current for driving the light emitting device to display a first target brightness and for driving the light emitting device to display a second target brightnessThe low light emitting current of (2) is the same.
Viewed from another perspective, fig. 6(b) provides a driving manner capable of controlling the light emitting device to display the second target luminance. Comparing fig. 6(a) and fig. 6(b), it is equivalent to that the current value of the light emitting current supplied to the light emitting device in the 1 st frame is increased in addition to the driving method of fig. 6(b) to obtain the driving method illustrated in fig. 6 (a). When the light emitting device is driven by the driving method provided in fig. 6(a), human eyes can observe the light emitting device to display the first target brightness.
In this embodiment, by increasing the light-emitting current of at least one of the N frames providing a high light-emitting current, it is possible to control the luminance of the light-emitting device to be increased when displaying N consecutive frames, thereby controlling the change in the gray-scale luminance of the light-emitting device.
In another embodiment, fig. 7 is a schematic diagram of another driving method provided by an embodiment of the present invention, and fig. 8 is a schematic diagram of a principle of driving a light emitting device in the driving method provided by fig. 7. As shown in fig. 7, the specific driving method includes:
step S1013: driving the light emitting device to display in N consecutive frames to control the light emitting device to display a first target brightness; wherein a high light emission current is supplied to the light emitting device in n frames and a low light emission current is supplied to the light emitting device in m frames; and supplying a first low light emitting current to the light emitting device for at least one of the m frames. In some embodiments, m is 1, and the first low light emitting current is supplied to the light emitting device in one of the N frames. In some embodiments, m ≧ 2, the low light emission currents provided to the light-emitting devices in the m frames may be the same or different, wherein the first low light emission current is provided to the light-emitting device in at least one frame.
Step S1014: driving the light emitting device to display in N consecutive frames to control the light emitting device to display a second target brightness; wherein a high light emission current is supplied to the light emitting device in n frames and a low light emission current is supplied to the light emitting device in m frames; and a maximum value of the low light emission current supplied to the light emitting device in the m frames is smaller than the first low light emission current. In some embodiments, m is 1, and the low light emitting current supplied to the light emitting device in one frame is less than the first low light emitting current. In some embodiments, m is greater than or equal to 2, the low light emitting currents provided to the light emitting devices in m frames may be the same or different, and the current values of the low light emitting currents are all smaller than the first low light emitting current.
As shown in fig. 8, for example, N-4 and N-m-2, the light emitting current provided to the light emitting device in 4 consecutive frames as shown in fig. 8(a) can control the light emitting device to display the first target luminance, and the light emitting current provided to the light emitting device in 4 consecutive frames as shown in fig. 8(b) can control the light emitting device to display the second target luminance. Wherein the current value I of the light-emitting current1>I01>I02>I2>I3。
The light emitting current required for the light emitting device to display the first target luminance in one frame is I01. In contrast, as illustrated in fig. 8(a), when the light emitting device is driven to display the first target luminance, the light emitting currents supplied to the light emitting device in 4 consecutive frames are sequentially: i is1、I2、I1、I3. Wherein, I1Relative to I01I.e. high luminous current, I3And I2Relative to I01I.e. a low light emission current.
The light emitting current required for the light emitting device to display the second target luminance in one frame is I02. In contrast, as illustrated in fig. 8(b), when the light emitting device is driven to display the second target luminance, the light emitting currents supplied to the light emitting device in 4 consecutive frames are sequentially: i is1、I3、I1、I3. Wherein, I1Relative to I02I.e. high luminous current, I3Relative to I02I.e. a low light emission current.
When FIG. 8(a) is compared with FIG. 8(b), the light emission current I is shown2I.e., a first low light emitting current used in driving the light emitting device to display a first target brightness. The low light emitting currents used in driving the light emitting device to display the second target luminance are all smaller than the first low light emitting current. FIG. 8 illustrates high light emission current for driving a light emitting device to display a first target luminance and high light emission for driving a light emitting device to display a second target luminanceThe photocurrents are the same.
Viewed from another perspective, fig. 8(b) provides a driving manner capable of controlling the light emitting device to display the second target luminance. Comparing fig. 8(a) and fig. 8(b), it is equivalent to that the current value of the light emitting current supplied to the light emitting device in the 2 nd frame is increased in addition to the driving method of fig. 8(b) to obtain the driving method illustrated in fig. 8 (a). When the light emitting device is driven by the driving method provided in fig. 8(a), human eyes can observe the light emitting device to display the first target brightness.
In this embodiment, by increasing the light emission current of at least one of the m frames supplying the low light emission current, it is possible to control the luminance of the light emitting device to be increased when displaying N consecutive frames, thereby controlling the change in the gray-scale luminance of the light emitting device.
In the driving method provided by the embodiment of the invention, the light emitting device is driven to display in N continuous frames so as to control the light emitting device to display the target brightness. The high luminous current and the low luminous current are mutually matched in the N frames, so that the display effect observed by human eyes displays the target brightness for the light-emitting device. The implementation mode of providing high light-emitting current for the light-emitting device in n frames includes various conditions, and the magnitude of the light-emitting current can be adjusted more flexibly, so that more display gray scale changes are realized, and the requirement of higher color depth is met.
In some embodiments, the current value of the high light emitting current supplied to the light emitting devices in n frames is the same. As illustrated in fig. 3, N is 4 and N is 2, that is, the light emitting device is driven to display in 4 consecutive frames to control the light emitting device to display the target brightness, wherein the high light emitting current provided to the light emitting device is controlled in 2 frames, and the high light emitting current provided in 2 frames are equal, IH。
In other embodiments, the current values of the high light emitting currents supplied to the light emitting devices in n frames are different from each other. As illustrated in fig. 4, taking N as 4 as an example, N is 2, that is, the light emitting devices are driven to perform display in 4 consecutive frames to control the light emitting devices to display the target brightness, wherein the high light emitting current provided to the light emitting devices is controlled in 2 frames, and the high light emitting current provided in 2 frames is not equal.
In other embodiments, in n frames: the current value of the high luminous current supplied to the light emitting device in at least two frames is the same and is different from the current value of the high luminous current supplied to the light emitting device in at least one frame, and n is more than or equal to 3. Taking N-6 and N-m-3 as an example, fig. 9 is a schematic diagram illustrating a principle of driving a light emitting device in another driving method according to an embodiment of the present invention. As shown in fig. 9, the light emission current I0Is a target light emission current, a light emission current I1And I2Relative to I0So-called high luminous current, luminous current I3Relative to I0Low light emission current. In this embodiment, a high light emitting current is supplied to the light emitting device in 3 frames out of 6 consecutive frames, and the magnitudes of the high light emitting currents supplied in the 3 frames are not all the same.
In addition, in the embodiment of the invention, the implementation mode of providing the low luminous current for the light emitting device in the m frames includes various conditions, and the size of the luminous current can be adjusted more flexibly, so that more display gray scale changes are realized, and the requirement of higher color depth is met.
In some embodiments, the current value of the low light emission current supplied to the light emitting devices in m frames is the same. As illustrated in fig. 3, N is 4 and N is 2, that is, the light emitting device is driven to perform display in 4 consecutive frames to control the light emitting device to display the target brightness, wherein the low light emitting current is controlled to be supplied to the light emitting device in 2 frames, and the low light emitting current supplied in 2 frames is equal, I isL。
In other embodiments, the current values of the low light emitting currents supplied to the light emitting devices in m frames are different from each other. Which are not illustrated in the drawings.
In other embodiments, in m frames: the current value of the low light emitting current supplied to the light emitting device in at least two frames is the same and is different from the current value of the low light emitting current supplied to the light emitting device in at least one frame, and m is larger than or equal to 3.
In some embodiments, controlling the light emitting device to display the target brightness further comprises: the target light emitting current is supplied to the light emitting device for at least one frame of the consecutive N frames. FIG. 10 shows the present inventionThe present embodiment provides a schematic diagram of a principle of driving a light emitting device in another driving method. As shown in fig. 10, for example, N-5 and N-m-2, light emitting current is provided to the light emitting device in 5 consecutive frames to control the light emitting device to display target brightness, where the light emitting current corresponding to the target brightness is I0. Providing a high light emission current I to a light emitting device in 2 framesHSupplying a low light emission current I to the light emitting device in 2 framesLAnd supplying a target light emitting current I to the light emitting device in 1 frame0. The embodiment provides another mode for controlling the light-emitting device to display the target gray scale, and provides a high light-emitting current, a low light-emitting current and a target light-emitting current for the light-emitting device in continuous multiframes, and the brightness displayed by the light-emitting device is observed by human eyes as the target brightness when continuous multiframe display is realized through the cooperation of the three light-emitting currents.
In some embodiments, fig. 11 is a flowchart of another driving method provided in an embodiment of the present invention, and as shown in fig. 11, the driving method includes:
step S201: and analyzing the pictures to be displayed of the display panel, and determining that the continuous N frames of pictures to be displayed comprise at least part of the same display content. The same display content means that the light emitting devices for displaying the partial image content are the same and the luminance of the corresponding light emitting devices is also the same.
Step S202: and defining a display area corresponding to the same display content in the display panel as a target area, wherein the target area comprises a plurality of light-emitting devices, and each light-emitting device corresponds to respective target brightness in the continuous N frames of pictures to be displayed. That is, the plurality of light emitting devices in the target area each have a respective target brightness, and the target brightness of one light emitting device in the target area is the same in N consecutive frames.
Step S203: the plurality of light emitting devices within the target area are respectively controlled to display in consecutive N frames so that each light emitting device displays the target luminance. Wherein a high light emitting current is supplied to the light emitting device in n frames, and a low light emitting current is supplied to the light emitting device in m frames.
In the driving method provided in this embodiment, first, consecutive multi-frame pictures to be displayed are analyzed, when the same display content exists in two or more consecutive frames, an area in the display panel for displaying the same content is defined as a target area, and a plurality of light emitting devices in the target area are controlled to perform the driving method provided in step S101 for displaying. The change of the display gray scale can be realized by adjusting the magnitude of the luminous current in a more flexible mode, the requirement of higher color depth is met, and the display picture is more exquisite.
In some embodiments, the step S201 analyzes the to-be-displayed picture of the display panel, and determines that the consecutive N frames of pictures to be displayed include at least part of the same display content, including: the display contents of the continuous N frames of pictures to be displayed are the same. The entire display area in the display panel is defined as a target area in step S202. In step S203, all the light emitting devices in the display area are controlled to display in N consecutive frames, so that each light emitting device displays the target brightness. And if the display contents of the continuous N frames to be displayed are the same, the display panel displays the static pictures in the continuous N frames. When the display panel continuously displays two or more frames of static images, the light emitting devices in the display panel are controlled to perform the driving method provided in step S101 for displaying. The change of the display gray scale can be realized by adjusting the magnitude of the luminous current in a more flexible mode, the requirement of higher color depth is met, and the display picture is more exquisite.
In some embodiments, as the driving method illustrated in the example of fig. 3, a high light emitting current and a low light emitting current are alternately supplied to the light emitting device in consecutive N frames to control the light emitting device to display a target luminance. This enables a better visual effect of displaying the brightness of the object.
In some embodiments, controlling a light emitting device to display a target brightness includes: target luminous current is I0High luminous current of IHLow luminous current of IL(ii) a Wherein, IH-I0≤10％I0，I0–IL≤10％I0. Light emitting device at high light emitting current supplied theretoMay be greater than the target brightness, and the brightness of the light emitting device may be less than the target brightness when a low light emitting current is supplied to the light emitting device. In the embodiment, the difference between the high light-emitting current and the target light-emitting current provided for the light-emitting device is not too large, and the difference between the low light-emitting current and the target light-emitting current is not too large, so that the higher brightness and the lower brightness can be prevented from being recognized by human eyes, and the brightness recognized by the human eyes is ensured to be the target brightness when the light-emitting device is controlled to display by the driving method provided by the embodiment of the invention.
In an embodiment, fig. 12 is a schematic view of a display panel according to an embodiment of the present invention. As shown in fig. 12, the display panel includes a first display area AA1 and a second display area AA2, and the first display area AA1 is an optical component arrangement area. In application, an optical component may be disposed below the first display area AA1, and the optical component may be a photosensitive device such as a camera. The light emitting device includes a first light emitting device positioned in the first display area AA1 and a second light emitting device positioned in the second display area AA 2; the first and second light emitting devices are shown and labeled in fig. 12. It is understood that a plurality of light emitting devices are disposed in each of the first and second display areas AA1 and AA 2. In some embodiments, the light transmittance of the first display area AA1 is greater than that of the second light transmission area AA2, so that the amount of light passing through the first display area AA1 can be increased in an application, and the optical performance of the optical component can be ensured. In some embodiments, the aperture ratio of the first display area AA1 is smaller than the aperture ratio of the second light transmission area AA2, wherein the size of the first light emitting device is smaller than the size of the second light emitting device, or the density of the first light emitting device is smaller than the density of the second light emitting device.
Fig. 13 is a flowchart of another driving method provided in the embodiment of the present invention, and the driving method provided in the embodiment of fig. 13 can be used to drive the display panel provided in the embodiment of fig. 12. As shown in fig. 13, step S101 of controlling the light emitting device to display the target luminance includes:
step S1015: controlling the display brightness of the first light emitting device to be greater than the display brightness of the second light emitting device in N consecutive frames; providing a high light emission current to the first light emitting device in n frames and providing a low light emission current to the first light emitting device in m frames while controlling the first light emitting device to display; supplying a high light emission current to the second light emitting device in n frames and supplying a low light emission current to the second light emitting device in m frames while controlling the second light emitting device to display; wherein the content of the first and second substances,
a current value of a high light emitting current supplied to the first light emitting device in n frames is larger than a current value of a high light emitting current supplied to the second light emitting device;
the current value of the low light emission current supplied to the first light emitting device in the m-frame is larger than the current value of the low light emission current supplied to the second light emitting device.
In the embodiment of the invention, the first light emitting device is positioned in the first display area AA1, and the second light emitting device is positioned in the second display area AA 2. By adopting the driving method provided by the embodiment of the invention, the change of the display gray scale of the first light-emitting device and the change of the display gray scale of the second light-emitting device can be realized by adjusting the magnitude of the luminous current in a more flexible way, so that the first light-emitting device and the second light-emitting device both meet the requirement of higher color depth, and the display pictures of the first display area AA1 and the second display area AA2 are finer and finer. In addition, the brightness of the first light emitting device is higher than that of the second light emitting device when the human eyes see the first light emitting device in the consecutive N frames, so that the brightness difference between the first display area AA1 and the second display area AA2 can be reduced, and the brightness uniformity of the display areas can be improved.
In another embodiment, fig. 14 is a schematic view of another display panel according to an embodiment of the present invention, as shown in fig. 14, the display panel further includes a third display area AA3, and the third display area AA3 is located between the first display area AA1 and the second display area AA 2; the light emitting device further includes a third light emitting device (not shown in fig. 14) positioned at the third display area AA 3. In the embodiment of the present invention, the third display area AA3 corresponds to a transition area. In some embodiments, the aperture ratio of the third display area AA3 is between the aperture ratio of the first display area AA1 and the aperture ratio of the second light-transmitting area AA 2. Wherein the size of the third light emitting device is between the size of the first light emitting device and the size of the second light emitting device, or the density of the third light emitting device is between the density of the first light emitting device and the density of the second light emitting device.
Fig. 15 is a flowchart of another driving method according to an embodiment of the present invention, and the driving method according to the embodiment of fig. 14 can be used to drive the display panel according to the embodiment of fig. 14. As shown in fig. 15, step S101 of controlling the light emitting device to display the target luminance includes:
step S1016: controlling the display brightness of the third light emitting device to be between the display brightness of the first light emitting device and the display brightness of the second light emitting device in N consecutive frames; supplying a high light emission current to the third light emitting device in n frames and supplying a low light emission current to the third light emitting device in m frames when controlling the third light emitting device to display; wherein the content of the first and second substances,
a current value of the high light emitting current supplied to the third light emitting device in the n frames is between a current value of the high light emitting current supplied to the first light emitting device and a current value of the high light emitting current supplied to the second light emitting device;
the current value of the low light emission current supplied to the third light emitting device in the m-frame is between the current value of the low light emission current supplied to the first light emitting device and the current value of the low light emission current supplied to the second light emitting device.
By adopting the driving method provided by the embodiment of the invention, the change of the display gray scale of the third light-emitting device can be realized by adjusting the magnitude of the luminous current in a more flexible way, so that the third light-emitting device meets the requirement of higher color depth, and the display picture of the third display area AA3 is also finer and smoother. In addition, the brightness of the third light-emitting device is between the brightness of the first light-emitting device and the brightness of the second light-emitting device when people observe the third light-emitting device in the continuous N frames, so that the brightness difference between the display areas can be reduced, and the brightness uniformity of the display areas is improved.
Fig. 16 is a schematic view of a display device according to an embodiment of the present invention, and as shown in fig. 16, the display device includes a display panel 100, and the display panel 100 is driven by a driving method according to any embodiment of the present invention. The driving method for the display panel has been described in the above embodiments, and is not described herein again. The display device provided by the embodiment of the invention is any equipment with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, a television, an intelligent watch and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (13)

1. A driving method of a display panel, characterized in that the display panel includes a plurality of light emitting devices; the driving method includes:
controlling the light-emitting device to display target brightness, wherein the target brightness comprises driving the light-emitting device to display in N continuous frames, the display panel is refreshed once and is recorded as one frame, N is an integer and is more than or equal to 2; wherein the content of the first and second substances,
supplying a high light emitting current to the light emitting device in n frames, and supplying a low light emitting current to the light emitting device in m frames; the high luminous current is larger than a target luminous current, the low luminous current is smaller than the target luminous current, the target luminous current is the current required by the luminous device to display the target brightness, N and m are positive integers, and N + m is less than or equal to N.
2. The driving method according to claim 1, wherein controlling the light emitting device to display the target luminance comprises:
driving the light emitting device to display in N consecutive frames to control the light emitting device to display a first target brightness; wherein at least one frame among the n frames supplies a first high light emitting current to the light emitting device;
driving the light emitting device to display in N consecutive frames to control the light emitting device to display a second target brightness, wherein the first target brightness is greater than the second target brightness; wherein a maximum value of a high light emission current provided to the light emitting device in n frames is less than the first high light emission current.
3. The driving method according to claim 1, wherein controlling the light emitting device to display the target luminance comprises:
driving the light emitting device to display in N consecutive frames to control the light emitting device to display a first target brightness; wherein a first low light emitting current is supplied to the light emitting device for at least one of the m frames;
driving the light emitting device to display in N consecutive frames to control the light emitting device to display a second target brightness, wherein the first target brightness is greater than the second target brightness; wherein a maximum value of the low light emission current supplied to the light emitting device in m frames is smaller than the first low light emission current.
4. The driving method according to claim 1, wherein the high light emission current is supplied to the light emitting device in n frames, including at least one of:
the current values of the high light emitting currents supplied to the light emitting devices in n frames are the same;
current values of the high light emitting currents supplied to the light emitting devices in n frames are different from each other;
in n frames: the current value of the high luminous current provided to the light emitting device in at least two frames is the same and is different from the current value of the high luminous current provided to the light emitting device in at least one frame, and n is more than or equal to 3.
5. The driving method according to claim 1, wherein the low light emission current is supplied to the light emitting device in m frames, including at least one of:
the current values of the low light emitting currents supplied to the light emitting devices in m frames are the same;
current values of the low light emission currents supplied to the light emitting devices in m frames are different from each other;
in m frames: the current value of the low light emitting current supplied to the light emitting device in at least two frames is the same and is different from the current value of the low light emitting current supplied to the light emitting device in at least one frame, and m is larger than or equal to 3.
6. The driving method according to claim 1, further comprising:
controlling the light emitting device to display the target brightness, further comprising: the target light emitting current is supplied to the light emitting device in at least one of consecutive N frames.
7. The driving method according to claim 1,
before controlling the light emitting device to display a target luminance, the driving method further includes:
analyzing the pictures to be displayed of the display panel, and determining that the continuous N frames of pictures to be displayed comprise at least part of the same display content;
defining a display area corresponding to the same display content in the display panel as a target area, wherein the target area comprises a plurality of light-emitting devices, and each light-emitting device corresponds to respective target brightness in continuous N frames of pictures to be displayed;
controlling the light emitting device to display a target brightness, comprising: and respectively controlling a plurality of light-emitting devices in the target area to display in N continuous frames.
8. The driving method according to claim 7,
analyzing the to-be-displayed picture of the display panel, and determining that the to-be-displayed continuous N frames of pictures comprise at least part of the same display content, wherein the method comprises the following steps: the display contents of the continuous N frames of pictures to be displayed are the same.
9. The driving method according to claim 1,
controlling the light emitting device to display a target brightness, comprising: alternately supplying the high light emitting current and the low light emitting current to the light emitting device.
10. The driving method according to claim 1,
controlling the light emitting device to display a target brightness, comprising: the target luminous current is I0The high luminous current is IHThe low luminous current is IL(ii) a Wherein, IH-I0≤10％I0，I0–IL≤10％I0。
11. The driving method according to claim 1, wherein the display panel includes a first display region and a second display region, the first display region being an optical member disposition region; the light emitting device comprises a first light emitting device and a second light emitting device, the first light emitting device is positioned in the first display area, and the second light emitting device is positioned in the second display area;
controlling the light emitting device to display a target brightness, comprising: controlling the display brightness of the first light emitting device to be greater than the display brightness of the second light emitting device in N consecutive frames; wherein the content of the first and second substances,
a current value of the high light emitting current supplied to the first light emitting device is greater than a current value of the high light emitting current supplied to the second light emitting device in n frames;
a current value of the low light emission current supplied to the first light emitting device in m frames is greater than a current value of the low light emission current supplied to the second light emitting device.
12. The driving method according to claim 11, wherein the display panel further comprises a third display region, the third display region being located between the first display region and the second display region; the light emitting device further includes a third light emitting device positioned in the third display region;
controlling the light emitting device to display a target brightness, further comprising: controlling the display brightness of the third light emitting device to be between the display brightness of the first light emitting device and the display brightness of the second light emitting device in N consecutive frames; wherein the content of the first and second substances,
a current value of the high light emitting current supplied to the third light emitting device in n frames is between a current value of the high light emitting current supplied to the first light emitting device and a current value of the high light emitting current supplied to the second light emitting device;
a current value of the low light emission current supplied to the third light emitting device in m frames is between a current value of the low light emission current supplied to the first light emitting device and a current value of the low light emission current supplied to the second light emitting device.
13. A display device comprising a display panel driven by the driving method according to any one of claims 1 to 12.
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