CN110853573B - Display device and driving method thereof - Google Patents

Display device and driving method thereof Download PDF

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Publication number
CN110853573B
CN110853573B CN201911207024.3A CN201911207024A CN110853573B CN 110853573 B CN110853573 B CN 110853573B CN 201911207024 A CN201911207024 A CN 201911207024A CN 110853573 B CN110853573 B CN 110853573B
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pixel row
pulse width
gray
light
pixel
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CN110853573A (en
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符鞠建
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai 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]
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2074—Display of intermediate tones using sub-pixels

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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)

Abstract

The embodiment of the invention provides a display device and a driving method thereof, relates to the technical field of display, and reduces the number of pulse width grades, thereby improving the control precision of pulse width. The display device includes: a display panel, comprising: n pixel rows arranged in a first direction, each pixel row including a plurality of sub-pixels arranged in a second direction, n > 1; the pulse width setting module is used for setting a minimum pulse width by taking a line gray-scale value corresponding to a first reference pixel line as a reference, and setting the pulse widths of other pixel lines according to the minimum pulse width, wherein the first reference pixel line is a pixel line with the lowest gray-scale value of the line; the light-emitting driving module comprises n light-emitting driving units, the n light-emitting driving units are electrically connected with the n pixel rows in a one-to-one correspondence manner, and each light-emitting driving unit is also electrically connected with the pulse width setting module; the light-emitting driving unit is used for outputting corresponding pulse signals to each pixel row according to the set pulse width and controlling the light-emitting time of each pixel row.

Description

Display device and driving method thereof
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of display technologies, and in particular, to a display device and a driving method thereof.
[ background of the invention ]
When the sub-pixels are driven to emit light by using a Pulse Width Modulation (PWM), for example, 1 to 255 gray scales are required, 255 pulse Width levels are required to be set to match with 255 gray scale values, but the pulse Width difference between the 1 gray scale and the 255 gray scale is large because the luminance difference between the 1 gray scale and the 255 gray scale is large. Generally, the luminance corresponding to the 1 gray scale is twenty ten thousandth of the luminance corresponding to the 255 gray scale, and correspondingly, the pulse width corresponding to the 1 gray scale is also twenty ten thousandth of the pulse width corresponding to the 255 gray scale.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a display device and a driving method thereof, which reduce the number of pulse width levels and thus improve the control accuracy of pulse widths.
In one aspect, an embodiment of the present invention provides a display device, including:
a display panel, comprising: n pixel rows arranged along a first direction, each of the pixel rows including a plurality of sub-pixels arranged along a second direction, n > 1, the first direction intersecting the second direction;
the pulse width setting module is used for setting a minimum pulse width by taking a line gray-scale value corresponding to a first reference pixel line as a reference, and setting the pulse widths of other pixel lines according to the minimum pulse width, wherein the first reference pixel line is the pixel line with the lowest line gray-scale value;
the light-emitting driving module comprises n light-emitting driving units, the n light-emitting driving units are electrically connected with the n pixel rows in a one-to-one correspondence manner, and each light-emitting driving unit is also electrically connected with the pulse width setting module; the light-emitting driving unit is used for outputting corresponding pulse signals to each pixel row according to the set pulse width and controlling the light-emitting time of each pixel row.
In another aspect, an embodiment of the present invention provides a driving method of a display device, the display device including a display panel including n pixel rows arranged in a first direction, each of the pixel rows including a plurality of sub-pixels arranged in a second direction, n > 1, the first direction intersecting the second direction;
the driving method includes:
setting a minimum pulse width by taking a line gray-scale value corresponding to a first reference pixel line as a reference, and setting pulse widths of other pixel lines according to the minimum pulse width, wherein the first reference pixel line is the pixel line with the lowest line gray-scale value;
and outputting corresponding pulse signals to each pixel row according to the set pulse width, and controlling the light-emitting time of each pixel row.
One of the above technical solutions has the following beneficial effects:
in the display device provided by the embodiment of the invention, the pulse width setting module and the light-emitting driving module are utilized to individually set the pulse width corresponding to each pixel row, so as to individually control the light-emitting time of each pixel row. In the embodiment of the present invention, after the minimum pulse width is set based on the first reference pixel row, only the pulse widths of other pixel rows need to be set based on the minimum pulse width, that is, the light emitting time of all pixel rows can be controlled by setting n pulse width levels at most in the embodiment of the present invention, so that the number of the set pulse width levels is reduced to a great extent, the control accuracy of the pulse widths is improved, and the light emitting accuracy of the pixel rows is further improved effectively.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a display device according to an embodiment of the invention;
fig. 3 is a schematic partial structure diagram of a display device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a prior art pixel driving circuit;
FIG. 5 is a timing diagram corresponding to FIG. 4;
FIG. 6 is a schematic diagram of another prior art pixel driving circuit;
FIG. 7 is a timing diagram corresponding to FIG. 6;
fig. 8 is a schematic structural diagram of a pulse width setting module according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a pulse width setting module according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a pulse width setting module according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the invention;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the invention;
FIG. 13 is a flowchart of a driving method according to an embodiment of the present invention;
FIG. 14 is another flow chart of a driving method according to an embodiment of the present invention;
fig. 15 is a flowchart illustrating a driving method according to an embodiment of the invention;
FIG. 16 is a flowchart illustrating a driving method according to another embodiment of the present invention;
fig. 17 is another flowchart of a driving method according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. 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.
An embodiment of the present invention provides a display device, as shown in fig. 1, fig. 1 is a schematic structural diagram of the display device provided in the embodiment of the present invention, and the display device includes a display panel 1, a pulse width setting module 2, and a light emitting driving module 3. Wherein, the display panel 1 includes: n pixel rows 4 arranged in a first direction, each pixel row 4 comprising a plurality of sub-pixels 5 arranged in a second direction, n > 1, the first direction intersecting the second direction; the pulse width setting module 2 is configured to set a minimum pulse width with a row gray-scale value corresponding to the first reference pixel row 41 as a reference, and set pulse widths of other pixel rows 4 according to the minimum pulse width, where the first reference pixel row 41 is the pixel row 4 with the lowest row gray-scale value; the light-emitting driving module 3 includes n light-emitting driving units 6, the n light-emitting driving units 6 are electrically connected to the n pixel rows 4 in a one-to-one correspondence manner, each light-emitting driving unit 6 is further electrically connected to the pulse width setting module 2, and the light-emitting driving units 6 are configured to output corresponding pulse signals to the pixel rows 4 according to the set pulse widths, so as to control the light-emitting time of the pixel rows 4.
In addition, the number of the first reference pixel rows 41 in the plurality of pixel rows 4 may be one or more, and when there are a plurality of pixel rows 4 having the same row gray-scale value and the lowest row gray-scale value, the part of the pixel rows 4 may be defined as the first reference pixel rows 41.
When the pixel rows 4 are driven to emit light, firstly, according to the row gray-scale value corresponding to each pixel row 4, the pixel row 4 with the lowest row gray-scale value is defined as a first reference pixel row 41, and the minimum pulse width is set by taking the row gray-scale value of the first reference pixel row 41 as a reference; then, setting the pulse widths of the other pixel rows 4 based on the minimum pulse width, for example, the gray-scale value of the row corresponding to the first reference pixel row 41 is G1, the minimum pulse width is PW1, and the gray-scale value of the row corresponding to the other pixel row 4 is G2, and setting the pulse width PW2 of the other pixel row 4 according to the formula G1/G2 — PW1/PW 2; finally, according to the pulse width set for each pixel row 4, a corresponding pulse signal is output to each pixel row 4, and the pulse width in the pulse signal is used to control the light emitting time of the pixel row 4, thereby realizing the control of the display brightness of the pixel row 4.
In the display device provided by the embodiment of the invention, the pulse width setting module 2 and the light-emitting driving module 3 are utilized to individually set the pulse width corresponding to each pixel row 4, so as to individually control the light-emitting time of each pixel row 4. Taking 1-255 gray levels as an example, in the prior art, 255 pulse width levels are required to be correspondingly set to match different gray level values, and in the embodiment of the present invention, after the minimum pulse width is set based on the first reference pixel row 41, only the pulse widths of other pixel rows 4 need to be set based on the minimum pulse width, that is, in the embodiment of the present invention, the light emitting time of all pixel rows 4 can be controlled by setting n pulse width levels at most, so that the number of the set pulse width levels is reduced to a great extent, the control accuracy of the pulse widths is improved, and further, the light emitting accuracy of the pixel rows 4 is effectively improved.
Optionally, as shown in fig. 2, fig. 2 is another schematic structural diagram of the display device according to the embodiment of the present invention, the display device further includes an analog voltage generating module 7, and the analog voltage generating module 7 is electrically connected to the pulse width setting module 2 and the light-emitting driving unit 6, and is configured to generate a corresponding analog voltage signal according to the set pulse width and transmit the analog voltage signal to the light-emitting driving unit 6; the light-emitting driving unit 6 is configured to convert the received analog voltage signal into a corresponding pulse signal, and transmit the pulse signal to the corresponding pixel row 4, and at this time, the light-emitting driving unit 6 may be configured as an analog-to-digital converter. Through setting up analog voltage generation module 7, luminous drive unit 6 only need receive an analog voltage signal, and then utilize its self function to convert it into pulse signal can, this kind of drive mode is comparatively simple, compares in directly generating pulse signal according to the pulse width moreover, and analog voltage signal is difficult for taking place to crosstalk in the transmission course, and then effectively improves the reliability of the pulse width information that contains in the pulse signal of luminous drive unit 6 conversion.
Optionally, as shown in fig. 3, fig. 3 is a schematic partial structure diagram of a display device according to an embodiment of the present invention, where the display device further includes a shift register 8 and n switch units 9, where the shift register 8 includes n cascaded shift register units 10, the n shift register units 10 are electrically connected to the n pixel rows 4 in a one-to-one correspondence, and the shift register units 10 are configured to output gate scanning signals; each switch unit 9 is electrically connected to the shift register unit 10 and the light-emitting driving unit 6 corresponding to the same pixel row 4, the switch unit 9 is further electrically connected to the analog voltage generation module 7, and the switch unit 9 is configured to transmit the analog voltage signal to the light-emitting driving unit 6 in response to the gate scanning signal, so that the light-emitting driving unit 6 converts the analog voltage signal into a corresponding pulse signal and outputs the pulse signal to the corresponding pixel row 4.
Based on the above arrangement, the shift register unit 10 outputs a gate scan signal, and controls the pixel row 4 to be turned on by using the active level of the gate scan signal, and the switch unit 9 controls the analog voltage signal to be transmitted to the light-emitting driving unit 6 under the action of the active level, so that the switch driving unit outputs a pulse signal to the pixel row 4 to control the pixel row 4 to emit light. In this way, the gate scan signal can be multiplexed as a control signal for controlling the transmission of the analog voltage signal to the light-emitting driving unit 6, thereby ensuring that the pixel row 4 emits light normally when being turned on, and reducing the circuit complexity without additionally providing a circuit structure for providing the control signal.
It should be noted that, after the gate scanning signal and the pulse signal are both transmitted to the pixel driving circuit included in the sub-pixel 5 and the light-emitting driving unit 6 outputs the pulse signal to the corresponding pixel row 4, the effective level (the duration of the effective level is the pulse width) in the pulse signal is only located in the light-emitting control period of the duty cycle of the pixel driving circuit, and in the light-emitting control period, the gate scanning signal may be either the effective level or the non-effective level.
Illustratively, as shown in fig. 4 and fig. 5, fig. 4 is a schematic diagram of a structure of a pixel driving circuit in the prior art, fig. 5 is a timing diagram corresponding to fig. 4, and one driving cycle of the pixel driving circuit includes an initialization period t1, a charging period t2, and a light emission control period t 3. In the initialization period T1, the first gate Scan signal Scan1 (the gate Scan signal output by the upper shift register unit 10) is at an active high level, the second gate Scan signal Scan2 (the gate Scan signal output by the present shift register unit 10) is at a low level, the pulse signal Emit is at a low level, and the gate voltage of the driving transistor T3 and the anode of the light emitting diode D are reset by the reference voltage signal Vref under the action of the active high level of the first gate Scan signal Scan 1; in the charging period T2, the first gate Scan signal Scan1 is at a low level, the second gate Scan signal Scan2 is at an active high level, and the pulse signal Emit is at a low level, under the action of the active high level of the second gate Scan signal Scan2, the Data signal Data is controlled to be written into the driving transistor T3, and the switching unit 9 responds to the active high level of the second gate Scan signal Scan2, transmits an analog voltage signal to the light-emitting driving unit 6, so that the light-emitting driving unit 6 outputs the corresponding pulse signal Emit; in the light emission control period t3, the first gate Scan signal Scan1 and the second gate Scan signal Scan2 are at a low level, the pulse signal Emit is at an active-high level, the light emitting diode D is driven to Emit light under the action of the written Data signal Data and the power supply signal PVDD under the action of the active-high level of the pulse signal Emit, and the light emission time of the light emitting diode D is controlled by the duration of the active-high level. As can be seen, based on the structure of the pixel driving circuit, the active-high level in the pulse signal Emit is located only in the emission control period t3, and the second gate Scan signal Scan2 is at the inactive level in the emission control period t 3.
Alternatively, as shown in fig. 6 and 7, fig. 6 is another schematic structural diagram of a pixel driving circuit in the prior art, fig. 7 is a timing diagram corresponding to fig. 6, where one driving cycle of the pixel driving circuit includes a light emission control period t1 ', and in the light emission control period t 1', the gate Scan signal Scan is at an active high level, the switching unit 9 responds to the active high level of the gate Scan signal Scan to transmit the analog voltage signal to the light emission driving unit 6, so that the light emission driving unit 6 outputs a corresponding pulse signal Emit, and in this period, the light emission time of the light emitting diode D is controlled by controlling the duration (pulse width size) of the active high level of the pulse signal Emit. As can be seen, also in the structure of the pixel drive circuit, the active-high level in the pulse signal Emit is only in the emission control period t1 ', and the gate Scan signal Scan is at the active level in the emission control period t 1'.
Further, referring again to fig. 3, the switch unit 9 includes: a switch transistor T, a gate of which is electrically connected to the shift register unit 10, a first pole of which is electrically connected to the analog voltage generating module 7, a second pole of which is electrically connected to the light-emitting driving unit 6, and the switch transistor T is configured to be turned on under the action of a gate scanning signal; and a first polar plate of the voltage-stabilizing capacitor C is electrically connected with a fixed power supply signal end VDD, and a second end of the voltage-stabilizing capacitor C is electrically connected with a second pole of the switching transistor T.
Specifically, the gate of the switching transistor T is turned on when receiving the effective level of the gate scan signal, the analog voltage signal generated by the analog voltage generation module 7 is transmitted to the light-emitting driving unit 6 through the turned-on switching transistor T, and since one end of the voltage stabilizing capacitor C is connected to a fixed potential, the stability of the analog voltage signal can be maintained by the voltage stabilizing capacitor C, thereby ensuring the reliability of the pulse signal output by the light-emitting driving unit 6.
Further, referring to fig. 3 again, the n switch units 9 are electrically connected to the analog voltage generating module 7 through an analog signal transmission line CL. Since the n cascaded shift register units 10 sequentially output the gate scan signals, even if the n switch units 9 are electrically connected to the analog voltage generation module 7 through one analog signal transmission line CL, the n switch units 9 can transmit the analog voltage signals provided by the analog signal transmission line CL to the light-emitting drive unit 6 in a time-sharing manner, thereby preventing the analog voltage signals between different light-emitting drive units 6 from being mutually interfered. In addition, the number of transmission wires for transmitting analog voltage signals can be reduced, and the space occupied by the transmission wires in the display device is reduced.
Alternatively, as shown in fig. 8, fig. 8 is a schematic structural diagram of a pulse width setting module according to an embodiment of the present invention, where the pulse width setting module 2 includes an average gray-scale value obtaining unit 11, a first reference pixel row obtaining unit 12, and a pixel row pulse width setting unit 13.
The average gray level value obtaining unit 11 is configured to determine an average gray level value corresponding to each pixel row 4 in one frame period according to the picture displayed by the display panel 1, where the average gray level value is the row gray level value. Specifically, according to the screen displayed by the display panel 1, the gray-scale values respectively corresponding to the plurality of sub-pixels 5 included in each pixel row 4 are determined, and then the average value of the gray-scale values corresponding to the plurality of sub-pixels 5 is set as the average gray-scale value corresponding to the pixel row 4.
The first reference pixel row obtaining unit 12 is electrically connected to the average gray-scale value obtaining unit 11, and is configured to obtain the first reference pixel row 41 with the lowest average gray-scale value according to the average gray-scale value corresponding to each pixel row 4.
The pixel row pulse width setting unit 13 is electrically connected to the average gray-scale value obtaining unit 11 and the first reference pixel row obtaining unit 12, and configured to set a minimum pulse width based on the average gray-scale value of the first reference pixel row 41, and set pulse widths of other pixel rows 4 according to the average gray-scale value and the minimum pulse width corresponding to each pixel row 4. For example, the average gray-scale value corresponding to the first reference pixel row 41 is G1, the minimum pulse width is PW1, and the average gray-scale value corresponding to the other pixel row 4 is G2, and the pulse width PW2 of the other pixel row 4 may be set according to the formula G1/G2-PW 1/PW2, so that setting up at most n pulse width levels in one frame period can implement individual control of the light emitting time of all pixel rows 4, thereby effectively reducing the number of levels of the pulse width and improving the control accuracy of the pulse width.
Alternatively, as shown in fig. 9, fig. 9 is another schematic structural diagram of the pulse width setting module according to the embodiment of the present invention, and the pulse width setting module 2 includes a sub-frame dividing unit 14, a gray scale and brightness obtaining unit 15, a light-emitting sub-frame setting unit 16, and a pulse width setting unit 17.
The subframe dividing unit 14 is configured to divide a frame period into m subframes, where a light emitting duration of an ith subframe is longer than a light emitting duration of an (i-1) th subframe, and i is not greater than m. The gray scale and brightness acquiring unit 15 is configured to determine an average gray scale value and an average display brightness value corresponding to each pixel row 4 according to the image displayed on the display panel 1.
The light-emitting sub-frame setting unit 16 is electrically connected to the sub-frame dividing unit 14 and the gray scale and brightness acquiring unit 15, respectively, for setting the gray scale and brightness of the light-emitting sub-frame in Lx-1＜L≤LxThen, the first x subframes are set as corresponding light-emitting subframes of the pixel row 4 in one frame period; wherein L is the average display brightness value corresponding to the pixel row 4, Lx-1Maximum total display brightness, L, for the first x-1 sub-frames of pixel row 4 in a frame periodxX is more than or equal to 1 and less than or equal to m, which is the maximum total display brightness of the first x sub-frames of the pixel row 4 in one frame period.
It should be noted that the maximum total display brightness of the first x subframes of the pixel row 4 is the sum of the maximum display brightness of the first x subframes of the pixel row 4, and the maximum display brightness of the pixel row 4 in a single subframe is the display brightness that the pixel row 4 presents under the action of the maximum driving current and the maximum light-emitting time duration.
Specifically, in the 1 st subframe, the pixel row 4 displays the maximum display luminance L1Judgment of L1Whether the current value is greater than or equal to L or not, if so, the 1 st subframe is a luminous subframe, the 2 nd to mth subframes are non-luminous subframes, and if not, the current value is in the No. 1 st subframeIn the 1 st and 2 nd sub-frames, the pixel row 4 is driven to display the maximum display brightness, and the maximum total display brightness L of the first two sub-frames is judged2And if not, driving the pixel row 4 to display the maximum display brightness in the 1 st to 3 rd subframes, and the like until the value of x is determined.
The pulse width setting unit 17 is electrically connected to the gray scale and brightness obtaining unit 15, the light-emitting subframe setting unit 16, and the light-emitting driving unit 6, and configured to obtain, in each light-emitting subframe, a first reference pixel row 41 with a lowest display gray scale value according to a display gray scale value of each pixel row 4 that emits light in the light-emitting subframe, where the display gray scale value is a row gray scale value, the minimum pulse width is set with the display gray scale value of the first reference pixel row 41 as a reference, and the pulse widths of the other pixel rows 4 are set according to the display gray scale value and the minimum pulse width of each pixel row 4 that emits light.
Taking three sub-frames and three pixel rows 4 as an example, assume that the maximum display gray scale value of the pixel row 4 in the 1 st sub-frame is 10, the maximum display gray scale value in the 2 nd sub-frame is 20, and the maximum display gray scale value in the 3 rd sub-frame is 30. Assuming that the average gray-scale value of the 1 st pixel row 4 is 5, the light-emitting subframe corresponding to the pixel row 4 is the 1 st subframe, and the display gray-scale value of the pixel row 4 in the 1 st subframe is 5; if the average gray-scale value of the 2 nd pixel row 4 is 15, the light-emitting sub-frame corresponding to the pixel row 4 is the 1 st sub-frame and the 2 nd sub-frame, and the display gray-scale value of the pixel row 4 in the 1 st sub-frame is 10, and the display gray-scale value in the 2 nd sub-frame is 5; if the average gray scale value of the 3 rd pixel row 4 is 40, the light-emitting sub-frame corresponding to the pixel row 4 is the 1 st sub-frame, the 2 nd sub-frame and the 3 rd sub-frame, and the display gray scale value of the pixel row 4 in the 1 st sub-frame is 10 gray scales, the display gray scale value in the 2 nd sub-frame is 20 gray scales, and the display gray scale value in the 3 rd sub-frame is 10 gray scales.
Then, in the 1 st light-emitting subframe, the 1 st to 3 rd pixel rows 4 are the pixel rows 4 that emit light, the 1 st pixel row 4 with the lowest display gray-scale value is taken as the first reference pixel row 41, and the minimum pulse width is set with the display gray-scale value of the 1 st pixel row 4 as the reference, and the pulse widths of the 2 nd and 3 rd pixel rows 4 are set based on the minimum pulse width; in the 2 nd light emitting sub-frame, the 2 nd and 3 rd pixel rows 4 are the pixel rows 4 that emit light, the 2 nd pixel row 4 with the lowest display gray-scale value is taken as the first reference pixel row 41, and the minimum pulse width is set with the display gray-scale value of the 2 nd pixel row 4 as the reference, and the pulse width of the 3 rd pixel row 4 is set based on the minimum pulse width.
Based on the setting mode, the pulse width of the pixel row 4 can be independently controlled in each light-emitting subframe, so that the light-emitting time of all the pixel rows 4 can be independently controlled by setting at most n pulse width levels, the number of the pulse width levels is effectively reduced, and the control precision of the pulse width is improved. And, the number of the light-emitting sub-frames is determined by the maximum total display brightness value, when the subsequent driving pixel row 4 emits light, the data voltage provided to it is the data voltage corresponding to the maximum driving current, and when the sub-pixel 5 emits light under the effect of the maximum driving current, the light-emitting efficiency of the sub-pixel 5 can be effectively improved.
Further, as shown in fig. 10, fig. 10 is a schematic diagram of another structure of the pulse width setting module according to the embodiment of the present invention, and the gray scale and brightness obtaining unit 15 includes a sub-pixel gray scale obtaining sub-unit 18, a pixel row gray scale obtaining sub-unit 19, and a pixel row brightness obtaining sub-unit 20. The sub-pixel gray scale obtaining sub-unit 18 is configured to determine, according to a picture displayed by the display panel 1, gray scale values respectively corresponding to the plurality of sub-pixels 5 included in each pixel row 4; the pixel row gray scale obtaining subunit 19 is electrically connected to the sub-pixel gray scale obtaining subunit 18 and the pulse width setting unit 17, and is configured to set an average value of gray scale values corresponding to the plurality of sub-pixels 5 as an average gray scale value corresponding to the pixel row 4; the pixel row brightness obtaining subunit 20 is electrically connected to the pixel row gray scale obtaining subunit 19 and the light-emitting subframe setting unit 16, respectively, and is configured to obtain an average display brightness value corresponding to each pixel row 4 according to a gray scale-brightness mapping relationship.
The average gray-scale value corresponding to the pixel row 4 is obtained by averaging the gray-scale values of the sub-pixels 5, so that the difference between the average gray-scale value and the gray-scale value required to be displayed by a single sub-pixel 5 can be avoided from being too large, that is, the difference between the overall brightness of the pixel row 4 and the display brightness required by a single sub-pixel 5 is avoided from being too large, and the display brightness of the pixel row 4 is relatively neutralized.
Further, referring to fig. 10 again, the display device further includes a first data voltage regulation module 21, where the first data voltage regulation module 21 is electrically connected to the sub-pixel gray scale obtaining sub-unit 18, and is configured to regulate the data voltage provided to the sub-pixels 5 according to the pulse width corresponding to the pixel row 4 and the gray scale values corresponding to the plurality of sub-pixels 5 in the pixel row 4, so that each sub-pixel 5 displays its corresponding gray scale value under the action of the regulated data voltage. By further using the first data voltage regulation module 21 to regulate the data voltage provided to the sub-pixels 5, each sub-pixel 5 of the pixel row 4 can still display its corresponding standard gray scale value under the action of the corresponding pulse width of the pixel row 4, thereby improving the display accuracy.
Optionally, as shown in fig. 11, fig. 11 is another schematic structural diagram of the display device according to the embodiment of the present invention, the display device further includes a determining module 22, where the determining module 22 is electrically connected to the pulse width setting module 2, and is configured to determine whether the second reference pixel row 42 exists, and if yes, issue a first regulating instruction; the difference between the line gray-scale values of the second reference pixel line 42 and the first reference pixel line 41 is smaller than a preset difference threshold. At this time, the pulse width setting module 2 is further configured to set the pulse width corresponding to the second reference pixel row 42 to the minimum pulse width under the action of the first regulation instruction. Further, the display device further includes a second data voltage regulating module 23, where the second data voltage regulating module 23 is electrically connected to the determining module 22, and is configured to regulate the data voltage corresponding to the second reference pixel row 42, so that the second reference pixel row 42 displays the row gray scale value corresponding to the regulated data voltage.
When there is the second reference pixel row 42 that is closer to the row gray-scale value of the first reference pixel row 41, the pulse width difference of the second reference pixel row 42 corresponding to the first reference pixel row 41 is small, so that the pulse width difference is difficult to be accurately controlled, resulting in a deviation in the actual display gray-scale value of the second reference pixel row 42. In the embodiment of the present invention, the pulse width corresponding to the second reference pixel row 42 is set to the minimum pulse width, and the display accuracy of the second reference pixel row 42 is ensured by compensating for the difference between the pulse widths of the second reference pixel row 42 and the first reference pixel row 41 by adjusting the data voltage supplied to the second reference pixel row 42.
Optionally, as shown in fig. 12, fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention, the display panel 1 further includes n light-emitting control signal lines 24 extending along the second direction, and the n light-emitting control signal lines 24 are electrically connected to the n pixel rows 4 in a one-to-one correspondence; the display device includes two light-emitting driving modules 3, and the light-emitting driving units 6 in the two light-emitting driving modules 3 are electrically connected to two ends of the light-emitting control signal line 24, respectively. With such an arrangement, the light-emitting driving units 6 in the two light-emitting driving modules 3 can provide pulse signals through the two ends of the light-emitting control signal line 24, so that not only can the attenuation degree of the pulse signals in the transmission process be reduced, but also the transmission rate of the signals can be improved.
The embodiment of the invention also provides a driving method of a display device, and with reference to fig. 1, the display device includes a display panel 1, the display panel 1 includes n pixel rows 4 arranged along a first direction, each pixel row 4 includes a plurality of sub-pixels 5 arranged along a second direction, n > 1, and the first direction intersects with the second direction. As shown in fig. 13, fig. 13 is a flowchart of a driving method according to an embodiment of the present invention, where the driving method includes:
step S1: and setting a minimum pulse width by taking the line gray-scale value corresponding to the first reference pixel line 41 as a reference, and setting the pulse widths of other pixel lines 4 according to the minimum pulse width, wherein the first reference pixel line 41 is the pixel line 4 with the lowest line gray-scale value.
Step S2: according to the set pulse width, a corresponding pulse signal is output to each pixel row 4, and the light emission time of each pixel row 4 is controlled.
By adopting the driving method provided by the embodiment of the invention, the pulse width corresponding to each pixel row 4 can be independently set, and the light-emitting time of each pixel row 4 can be independently controlled. After the minimum pulse width is set based on the first reference pixel row 41, only the pulse widths of the other pixel rows 4 need to be set based on the minimum pulse width, that is, in the embodiment of the present invention, the light emitting time of all the pixel rows 4 can be controlled by setting at most n pulse width levels, the number of the set pulse width levels is reduced to a great extent, the control accuracy of the pulse width is improved, and the light emitting accuracy of the pixel rows 4 is further effectively improved.
Optionally, with reference to fig. 2, as shown in fig. 14, fig. 14 is another flowchart of the driving method provided in the embodiment of the present invention, and step S2 may specifically include:
step S21: and generating a corresponding analog voltage signal according to the set pulse width.
Step S22: the analog voltage signal is converted into a corresponding pulse signal and transmitted to the pixel rows 4, and the light emitting time of each pixel row 4 is controlled.
By adopting the driving method, the analog voltage signal is generated according to the pulse width, and then the analog voltage signal is converted into the corresponding pulse signal, compared with the method of directly generating the pulse signal according to the pulse width, the analog voltage signal is not easy to generate crosstalk in the transmission process, thereby effectively improving the reliability of the pulse width information contained in the converted pulse signal.
Further, with reference to fig. 3, the gate scan signal is used to control the analog voltage signal to be converted into a corresponding pulse signal, and the corresponding pulse signal is transmitted to the pixel row 4, at this time, the gate scan signal can be reused as a control signal for controlling the analog voltage signal to be converted into the pulse signal, so that the pixel row 4 is ensured to normally emit light when being turned on, and a circuit structure for providing the control signal is not required to be additionally arranged, thereby reducing the circuit complexity.
Optionally, with reference to fig. 8, as shown in fig. 15, fig. 15 is another flowchart of the driving method provided in the embodiment of the present invention, and step S1 may specifically include:
step S11: according to the picture displayed by the display panel 1, the average gray-scale value corresponding to each pixel row 4 in one frame period is determined, and the average gray-scale value is the row gray-scale value. Specifically, according to the screen displayed by the display panel 1, the gray-scale values respectively corresponding to the plurality of sub-pixels 5 included in each pixel row 4 are determined, and then the average value of the gray-scale values corresponding to the plurality of sub-pixels 5 is set as the average gray-scale value corresponding to the pixel row 4.
Step S12: according to the average gray-scale value corresponding to each pixel row 4, the first reference pixel row 41 with the lowest average gray-scale value is obtained.
Step S13: the minimum pulse width is set based on the average gray-scale value of the first reference pixel row 41, and the pulse widths of the other pixel rows 4 are set according to the average gray-scale value and the minimum pulse width corresponding to each pixel row 4.
By adopting the driving method, the light emitting time of all the pixel rows 4 can be independently controlled by setting n pulse width grades at most in one frame period, so that the number of the pulse width grades is effectively reduced, and the control precision of the pulse width is improved.
Optionally, with reference to fig. 9 and as shown in fig. 16, fig. 16 is a further flowchart of the driving method according to the embodiment of the present invention, and step S1 may specifically include:
step S11': and dividing one frame period into m subframes, wherein the luminous time length of the ith subframe is longer than that of the (i-1) th subframe, and i is less than or equal to m.
Step S12': according to the picture displayed by the display panel 1, the average gray-scale value and the average display brightness value corresponding to each pixel row 4 are determined.
Step S13': at Lx-1＜L≤LxThen, the first x subframes are set as corresponding light-emitting subframes of the pixel row 4 in one frame period; wherein L is the average display brightness value corresponding to the pixel row 4, Lx-1Maximum total display brightness, L, for the first x-1 sub-frames of pixel row 4 in a frame periodxX is more than or equal to 1 and less than or equal to m, which is the maximum total display brightness of the first x sub-frames of the pixel row 4 in one frame period.
Step S14': in each light-emitting subframe, according to the display gray-scale value of each pixel row 4 which emits light in the light-emitting subframe, a first reference pixel row 41 with the lowest display gray-scale value is obtained, the display gray-scale value is a row gray-scale value, the minimum pulse width is set by taking the display gray-scale value of the first reference pixel row 41 as the reference, and the pulse widths of other pixel rows 4 are set according to the display gray-scale value and the minimum pulse width of each pixel row 4 which emits light.
The specific manner of acquiring the light-emitting sub-frame and the first reference pixel row 41 is described in the above embodiments, and the description thereof is not repeated here.
Based on the driving method, the pulse width of the pixel row 4 can be independently controlled in each light-emitting subframe, so that the light-emitting time of all the pixel rows 4 can be independently controlled by setting at most n pulse width levels, the number of the pulse width levels is effectively reduced, and the control precision of the pulse width is improved. And, the number of the light-emitting sub-frames is determined by the maximum total display brightness value, when the subsequent driving pixel row 4 emits light, the data voltage provided to it is the data voltage corresponding to the maximum driving current, and when the sub-pixel 5 emits light under the effect of the maximum driving current, the light-emitting efficiency of the sub-pixel 5 can be effectively improved.
Further, referring to fig. 10 and as shown in fig. 17, fig. 17 is another flowchart of the driving method according to the embodiment of the present invention, and step S12' may specifically include:
step S121': according to the picture displayed by the display panel 1, the gray-scale values corresponding to the sub-pixels 5 included in each pixel row 4 are determined.
Step S122': the average of the gray-scale values corresponding to the plurality of sub-pixels 5 is set as the gray-scale value corresponding to the pixel row 4.
Step S123': and obtaining the average display brightness value corresponding to each pixel row 4 according to the gray scale-brightness mapping relation.
The average gray-scale value corresponding to the pixel row 4 is obtained by averaging the gray-scale values of the sub-pixels 5, so that the difference between the average gray-scale value and the gray-scale value required to be displayed by a single sub-pixel 5 can be avoided from being too large, that is, the difference between the overall brightness of the pixel row 4 and the display brightness required by a single sub-pixel 5 is avoided from being too large, and the display brightness of the pixel row 4 is relatively neutralized.
Further, with reference to fig. 10, the driving method provided in the embodiment of the present invention further includes: according to the pulse width corresponding to the pixel row 4 and the gray-scale values corresponding to the plurality of sub-pixels 5 in the pixel row 4, the data voltage supplied to the sub-pixels 5 is adjusted, so that each sub-pixel 5 displays the corresponding gray-scale value under the action of the adjusted data voltage, and the display precision of the pixel row 4 is improved.
Optionally, with reference to fig. 11, step S1 may further include: judging whether a second reference pixel line 42 exists or not, and if so, issuing a first regulation and control instruction; the difference between the line gray-scale values of the second reference pixel line 42 and the first reference pixel line 41 is less than a preset difference threshold; under the action of the first regulation instruction, the pulse width corresponding to the second reference pixel row 42 is set to be the minimum pulse width. Further, the driving method may further include: the data voltage corresponding to the second reference pixel row 42 is adjusted, so that the second reference pixel row 42 displays the corresponding row gray scale value under the action of the adjusted data voltage.
When there is the second reference pixel row 42 that is closer to the row gray-scale value of the first reference pixel row 41, the pulse width difference of the second reference pixel row 42 corresponding to the first reference pixel row 41 is small, making it difficult to accurately control the pulse width difference. With the above driving method, the pulse width corresponding to the second reference pixel row 42 is also set to the minimum pulse width, and the display accuracy of the second reference pixel row 42 is ensured by compensating for the difference between the pulse widths of the second reference pixel row 42 and the first reference pixel row 41 by adjusting the data voltage supplied to the second reference pixel row 42.
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 (19)

1. A display device, comprising:
a display panel, comprising: n pixel rows arranged along a first direction, each of the pixel rows including a plurality of sub-pixels arranged along a second direction, n > 1, the first direction intersecting the second direction;
the pulse width setting module is used for setting a minimum pulse width by taking a line gray-scale value corresponding to a first reference pixel line as a reference, and setting the pulse widths of other pixel lines according to the minimum pulse width, wherein the first reference pixel line is the pixel line with the lowest line gray-scale value;
the light-emitting driving module comprises n light-emitting driving units, the n light-emitting driving units are electrically connected with the n pixel rows in a one-to-one correspondence manner, and each light-emitting driving unit is also electrically connected with the pulse width setting module; the light-emitting driving unit is used for outputting corresponding pulse signals to each pixel row according to the set pulse width and controlling the light-emitting time of each pixel row.
2. The display device according to claim 1, further comprising:
the analog voltage generation module is respectively electrically connected with the pulse width setting module and the light-emitting driving unit and is used for generating a corresponding analog voltage signal according to the set pulse width and transmitting the analog voltage signal to the light-emitting driving unit;
the light-emitting driving unit is used for converting the received analog voltage signal into a corresponding pulse signal and transmitting the pulse signal to the corresponding pixel row.
3. The display device according to claim 2, further comprising:
the shift register comprises n cascaded shift register units, the n shift register units are electrically connected with the n pixel rows in a one-to-one correspondence mode, and the shift register units are used for outputting grid scanning signals;
each switch unit is electrically connected with the shift register unit and the light-emitting driving unit corresponding to the same pixel row, and the switch units are also electrically connected with the analog voltage generation module; the switch unit is used for responding to the grid scanning signal, transmitting the analog voltage signal to the light-emitting driving unit, converting the analog voltage signal into a corresponding pulse signal by the light-emitting driving unit, and outputting the corresponding pulse signal to the corresponding pixel row.
4. The display device according to claim 3,
the switching unit includes:
a switch transistor, a gate of which is electrically connected with the shift register unit, a first pole of which is electrically connected with the analog voltage generation module, and a second pole of which is electrically connected with the light-emitting drive unit, wherein the switch transistor is used for conducting under the action of the gate scanning signal;
and a first pole plate of the voltage stabilizing capacitor is electrically connected with a fixed power signal end, and a second end of the voltage stabilizing capacitor is electrically connected with a second pole of the switch transistor.
5. The display device according to claim 3,
the n switch units are electrically connected with the analog voltage generation module through an analog signal transmission line.
6. The display device according to claim 1, wherein the pulse width setting module comprises:
an average gray scale value obtaining unit, configured to determine, according to a picture displayed by the display panel, an average gray scale value corresponding to each pixel row in a frame period, where the average gray scale value is the row gray scale value;
a first reference pixel row obtaining unit electrically connected to the average gray-scale value obtaining unit, configured to obtain, according to the average gray-scale value corresponding to each pixel row, the first reference pixel row with the lowest average gray-scale value;
and the pixel row pulse width setting unit is respectively electrically connected with the average gray-scale value acquisition unit and the first reference pixel row acquisition unit, and is used for setting the minimum pulse width by taking the average gray-scale value of the first reference pixel row as a reference and setting the pulse widths of other pixel rows according to the average gray-scale value and the minimum pulse width corresponding to each pixel row.
7. The display device according to claim 1, wherein the pulse width setting module comprises:
the sub-frame dividing unit is used for dividing one frame period into m sub-frames, wherein the luminous time length of the ith sub-frame is longer than that of the (i-1) th sub-frame, and i is less than or equal to m;
the gray scale and brightness acquisition unit is used for determining an average gray scale value and an average display brightness value corresponding to each pixel row according to the picture displayed by the display panel;
a light-emitting sub-frame setting unit electrically connected with the sub-frame dividing unit and the gray scale and brightness acquiring unit respectively for setting the gray scale and brightness of the light-emitting sub-framex-1＜L≤LxThen, setting the first x sub-frames as the corresponding light-emitting sub-frames of the pixel rows in one frame period; wherein L is the average display brightness value corresponding to the pixel row, Lx-1Maximum total display luminance, L, of the first x-1 sub-frames in a frame period for the pixel rowxX is more than or equal to 1 and less than or equal to m, and the maximum total display brightness of the first x sub-frames of the pixel row in one frame period is larger than or equal to 1;
and the pulse width setting unit is respectively electrically connected with the gray scale and brightness acquisition unit, the light-emitting subframe setting unit and the light-emitting drive unit, and is used for acquiring the first reference pixel row with the lowest display gray scale value in each light-emitting subframe according to the display gray scale value of each light-emitting pixel row in the light-emitting subframe, wherein the display gray scale value is the row gray scale value, the minimum pulse width is set by taking the display gray scale value of the first reference pixel row as a reference, and the pulse widths of other pixel rows are set according to the display gray scale value of each light-emitting pixel row and the minimum pulse width.
8. The display device according to claim 7, wherein the grayscale and luminance obtaining unit comprises:
the sub-pixel gray scale obtaining sub-unit is used for determining gray scale values respectively corresponding to a plurality of sub-pixels included in each pixel row according to the picture displayed by the display panel;
the pixel row gray scale obtaining subunit is respectively electrically connected with the sub-pixel gray scale obtaining subunit and the pulse width setting unit and is used for setting the average value of the gray scale values corresponding to the sub-pixels as the average gray scale value corresponding to the pixel row;
and the pixel row brightness acquisition subunit is respectively electrically connected with the pixel row gray scale acquisition subunit and the light-emitting subframe setting unit and is used for acquiring the average display brightness value corresponding to each pixel row according to a gray scale-brightness mapping relation.
9. The display device according to claim 8, further comprising:
and the first data voltage regulation and control module is electrically connected with the sub-pixel gray scale acquisition sub-unit and is used for regulating the data voltage provided to the sub-pixels according to the pulse width corresponding to the pixel row and the gray scale values corresponding to the sub-pixels in the pixel row, so that each sub-pixel displays the corresponding gray scale value under the action of the regulated data voltage.
10. The display device according to claim 1,
the display device further includes:
the judging module is electrically connected with the pulse width setting module and is used for judging whether a second reference pixel row exists or not, and if so, issuing a first regulating and controlling instruction; the difference value of the line gray scale values of the second reference pixel line and the first reference pixel line is smaller than a preset difference threshold value;
the pulse width setting module is further configured to set a pulse width corresponding to the second reference pixel row to the minimum pulse width under the action of the first regulation instruction;
the display device further includes:
and the second data voltage regulation and control module is electrically connected with the judgment module and is used for regulating the data voltage corresponding to the second reference pixel row so that the second reference pixel row displays the corresponding row gray-scale value under the action of the regulated data voltage.
11. The display device according to claim 1,
the display panel further comprises n light-emitting control signal lines extending along the second direction, and the n light-emitting control signal lines are electrically connected with the n pixel rows in a one-to-one correspondence manner;
the display device comprises two light-emitting driving modules, and the light-emitting driving units in the two light-emitting driving modules are respectively and electrically connected with two ends of the light-emitting control signal line.
12. A driving method of a display device is characterized in that,
the display device comprises a display panel, wherein the display panel comprises n pixel rows arranged along a first direction, each pixel row comprises a plurality of sub-pixels arranged along a second direction, n is larger than 1, and the first direction intersects with the second direction;
the driving method includes:
setting a minimum pulse width by taking a line gray-scale value corresponding to a first reference pixel line as a reference, and setting pulse widths of other pixel lines according to the minimum pulse width, wherein the first reference pixel line is the pixel line with the lowest line gray-scale value;
and outputting corresponding pulse signals to each pixel row according to the set pulse width, and controlling the light-emitting time of each pixel row.
13. The driving method according to claim 12, wherein the outputting of the corresponding pulse signal to each of the pixel rows according to the set pulse width, and the controlling of the light emission time of each of the pixel rows includes:
generating a corresponding analog voltage signal according to the set pulse width;
and converting the analog voltage signal into a corresponding pulse signal, transmitting the pulse signal into the pixel rows, and controlling the light-emitting time of each pixel row.
14. The driving method according to claim 13, wherein the analog voltage signal is converted into a corresponding pulse signal and transmitted into the pixel row by gate scan signal control.
15. The driving method according to claim 12,
the setting of the minimum pulse width by taking the line gray-scale value corresponding to the first reference pixel line as a reference and the setting of the pulse widths of other pixel lines according to the minimum pulse width include:
determining an average gray scale value corresponding to each pixel row in a frame period according to a picture displayed by the display panel, wherein the average gray scale value is the row gray scale value;
acquiring the first reference pixel row with the lowest average gray-scale value according to the average gray-scale value corresponding to each pixel row;
setting the minimum pulse width by taking the average gray-scale value of the first reference pixel row as a reference, and setting the pulse widths of other pixel rows according to the average gray-scale value and the minimum pulse width corresponding to each pixel row.
16. The driving method according to claim 12,
the setting of the minimum pulse width by taking the line gray-scale value corresponding to the first reference pixel line as a reference and the setting of the pulse widths of other pixel lines according to the minimum pulse width include:
dividing a frame period into m subframes, wherein the luminous time length of the ith subframe is longer than that of the (i-1) th subframe, and i is less than or equal to m;
determining an average gray-scale value and an average display brightness value corresponding to each pixel row according to the picture displayed by the display panel;
at Lx-1＜L≤LxThen, setting the first x sub-frames as the corresponding light-emitting sub-frames of the pixel rows in one frame period; wherein L is the average display brightness value corresponding to the pixel row, Lx-1Maximum total display luminance, L, of the first x-1 sub-frames in a frame period for the pixel rowxX is more than or equal to 1 and less than or equal to m, and the maximum total display brightness of the first x sub-frames of the pixel row in one frame period is larger than or equal to 1;
in each light-emitting subframe, the first reference pixel row with the lowest display gray-scale value is obtained according to the display gray-scale value of each light-emitting pixel row in the light-emitting subframe, the display gray-scale value is the row gray-scale value, the minimum pulse width is set by taking the display gray-scale value of the first reference pixel row as the reference, and the pulse widths of other pixel rows are set according to the display gray-scale value of each light-emitting pixel row and the minimum pulse width.
17. The driving method according to claim 16,
the determining the average gray-scale value and the average display brightness value corresponding to each pixel row according to the picture displayed by the display panel includes:
determining gray-scale values respectively corresponding to a plurality of sub-pixels included in each pixel row according to a picture displayed by the display panel;
setting the average value of the gray-scale values corresponding to the sub-pixels as the gray-scale value corresponding to the pixel row;
and acquiring the average display brightness value corresponding to each pixel row according to the gray scale-brightness mapping relation.
18. The driving method according to claim 17, further comprising:
and adjusting the data voltage provided to the sub-pixels according to the pulse width corresponding to the pixel row and the gray-scale values corresponding to the sub-pixels in the pixel row, so that each sub-pixel displays the corresponding gray-scale value under the action of the adjusted data voltage.
19. The driving method according to claim 12, further comprising:
the setting of the minimum pulse width with the line gray-scale value corresponding to the first reference pixel line as a reference and the setting of the pulse widths of the other pixel lines according to the minimum pulse width further include:
judging whether a second reference pixel row exists or not, and if so, issuing a first regulation and control instruction; the difference value of the line gray scale values of the second reference pixel line and the first reference pixel line is smaller than a preset difference threshold value;
setting the pulse width corresponding to the second reference pixel row as the minimum pulse width under the action of the first regulation and control instruction;
the driving method further includes:
and adjusting the data voltage corresponding to the second reference pixel row to enable the second reference pixel row to display the corresponding row gray-scale value under the action of the adjusted data voltage.
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