CN113920939B - Brightness compensation method, brightness compensation module and display device - Google Patents

Brightness compensation method, brightness compensation module and display device Download PDF

Info

Publication number
CN113920939B
CN113920939B CN202111261996.8A CN202111261996A CN113920939B CN 113920939 B CN113920939 B CN 113920939B CN 202111261996 A CN202111261996 A CN 202111261996A CN 113920939 B CN113920939 B CN 113920939B
Authority
CN
China
Prior art keywords
sub
display
black insertion
period
driving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111261996.8A
Other languages
Chinese (zh)
Other versions
CN113920939A (en
Inventor
冯雪欢
程雪连
金凯佳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Hefei BOE Zhuoyin Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Hefei BOE Zhuoyin Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd, Hefei BOE Zhuoyin Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN202111261996.8A priority Critical patent/CN113920939B/en
Publication of CN113920939A publication Critical patent/CN113920939A/en
Application granted granted Critical
Publication of CN113920939B publication Critical patent/CN113920939B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects

Abstract

The present disclosure provides a brightness compensation method applied to a display device, the display device includes a plurality of rows of sub-pixel rows, each frame is configured with a corresponding frame display period and a black insertion driving period, the frame display period includes: a display driving period and a blank period, the black insertion driving period including: the luminance compensation method includes: determining a display black insertion driving interval and a sub-pixel row to be compensated corresponding to a frame picture to be driven according to the display frequency of the frame picture to be driven, wherein the display black insertion driving interval is a time interval between the starting moment of a display driving time interval and the starting moment of a first black insertion sub-time interval in the driving process of the frame picture to be driven, and the sub-pixel row to be compensated is a sub-pixel row to be subjected to black insertion driving in the first black insertion sub-time interval or a sub-pixel row to be subjected to black insertion driving in a second black insertion sub-time interval; and performing brightness compensation on the sub-pixel line to be compensated according to the pre-configured voltage gain compensation parameter.

Description

Brightness compensation method, brightness compensation module and display device
Technical Field
The present invention relates to the field of display, and in particular, to a brightness compensation method, a brightness compensation module, and a display device.
Background
In the display field, especially in an Organic Light Emitting Diode (OLED) display device, a dynamic image smear phenomenon is easily generated during the switching process of a dynamic display frame, that is, when a previous frame of display frame is switched to a next frame of display frame, the smear of the previous frame of display frame is sensed. In order to overcome the smear phenomenon of the dynamic image, the related art adds a picture black cutting process during the pixel luminescence period, and reduces the normal display time of the pixel by adding the picture black cutting process, thereby effectively improving the smear phenomenon of the dynamic image.
Disclosure of Invention
In a first aspect, an embodiment of the present disclosure provides a luminance compensation method applied to a display device, where the display device includes a plurality of rows of sub-pixel rows, each frame is configured with a corresponding frame display period and a black insertion driving period, and the frame display period includes: a display driving period and a blank period located after the display driving period, the black insertion driving period including: a first black insertion sub-period and a second black insertion sub-period, the first black insertion sub-period being located after a start time of the display driving period corresponding to the same frame and before the blank period corresponding to the same frame, the second black insertion sub-period being located after an end time of the blank period corresponding to the same frame;
the brightness compensation method includes:
determining a display black insertion driving interval and a sub-pixel row to be compensated corresponding to the frame picture to be driven according to the display frequency of the frame picture to be driven, wherein the display black insertion driving interval is a time interval between the starting time of the display driving interval and the starting time of the first black insertion sub-interval in the driving process of the frame picture to be driven, and the sub-pixel row to be compensated is a sub-pixel row to be subjected to black insertion driving in the first black insertion sub-interval or a sub-pixel row to be subjected to black insertion driving in the second black insertion sub-interval;
and performing brightness compensation on the sub-pixel line to be compensated according to a pre-configured voltage gain compensation parameter.
In some embodiments, the brightness compensation of the sub-pixel row to be compensated according to the pre-configured voltage gain compensation parameter comprises:
compensating the data voltage of the sub-pixel according to a pre-configured voltage gain compensation parameter aiming at any one sub-pixel in the sub-pixel row to be compensated;
the compensated data voltage is Vdata', Vdata ═ Vdata × gain, Vdata is the data voltage before compensation, and gain is the voltage gain compensation parameter.
In some embodiments, the voltage gain compensation parameters configured for different display frequencies are the same in the display device.
In some embodiments, the step of determining the display black insertion driving interval corresponding to the frame picture to be driven according to the display frequency of the frame picture to be driven includes:
acquiring the display frequency of the frame picture to be driven;
determining a display black insertion driving interval corresponding to the display frequency of the frame picture to be driven according to pre-stored first corresponding relation data;
the first correspondence data includes different display frequencies and display black insertion driving intervals corresponding to the display frequencies, or the first correspondence data includes different display frequency bands and display black insertion driving intervals corresponding to the display frequency bands.
In some embodiments, after the step of performing brightness compensation on the sub-pixel line to be compensated according to the pre-configured voltage gain compensation parameter, the method further includes:
controlling a gate driving circuit and a source driving circuit to drive the frame picture to be driven according to the display black insertion driving interval and the display data completing the brightness compensation, comprising:
in the display driving time period, controlling the gate driving circuit and the source driving circuit to sequentially perform normal display driving on each row of sub-pixels, wherein data voltages subjected to brightness compensation are written in each row of the sub-pixels to be compensated;
entering a first black insertion sub-period after the display driving period begins and the duration of the display black insertion driving interval passes, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on part of the sub-pixel rows;
and entering a second black insertion sub-period after the blank period is ended, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on one part of the sub-pixel rows and perform black insertion driving on the other part of the sub-pixel rows.
In a second aspect, the present disclosure provides a brightness compensation method applied to a display device, where the display device includes a plurality of rows of sub-pixel rows, each frame is configured with a corresponding frame display period and a black insertion driving period, and the frame display period includes: a display driving period and a blank period located after the display driving period, the black insertion driving period including: a first black insertion sub-period and a second black insertion sub-period, the first black insertion sub-period being located after a start time of the display driving period corresponding to the same frame picture and before the blank period corresponding to the same frame picture, the second black insertion sub-period being located after an end time of the blank period corresponding to the same frame picture;
the brightness compensation method includes:
determining a voltage gain compensation parameter corresponding to the frame picture to be driven according to the display frequency of the frame picture to be driven;
and performing brightness compensation on the sub-pixel row to be compensated according to the voltage gain compensation parameter, wherein the sub-pixel row to be compensated is the sub-pixel row to be subjected to black insertion driving in the first black insertion sub-period or the sub-pixel row to be subjected to black insertion driving in the second black insertion sub-period.
In some embodiments, the step of performing brightness compensation on the sub-pixel line to be compensated according to the voltage gain compensation parameter comprises:
compensating the data voltage of the sub-pixel according to a pre-configured voltage gain compensation parameter aiming at any one sub-pixel in the sub-pixel row to be compensated;
the compensated data voltage is Vdata', Vdata ═ Vdata × gain, Vdata is the data voltage before compensation, and gain is the voltage gain compensation parameter.
In some embodiments, in the display device, the display black insertion driving intervals configured at different display frequencies and the rows of the sub-pixels to be compensated are the same;
the display black insertion driving interval is a time interval between a start time of the display driving period and a start time of the first black insertion sub-period in a driving process of the frame picture to be driven.
In some embodiments, the step of determining the voltage gain compensation parameter corresponding to the frame picture to be driven according to the display frequency of the frame picture to be driven includes:
acquiring the display frequency of the frame picture to be driven;
determining a voltage gain compensation parameter corresponding to the display frequency of the frame picture to be driven according to pre-stored second corresponding relation data;
the second corresponding relation data is recorded with different display frequencies and voltage gain compensation parameters corresponding to the display frequencies, or the second corresponding relation data is recorded with different display frequency bands and voltage gain compensation parameters corresponding to the display frequency bands.
In some embodiments, after the step of performing brightness compensation on the sub-pixel line to be compensated according to the pre-configured voltage gain compensation parameter, the method further includes:
controlling a gate driving circuit and a source driving circuit to drive the frame picture to be driven according to the pre-acquired display black insertion driving interval and the display data completing the brightness compensation, comprising:
in the display driving time period, controlling the gate driving circuit and the source driving circuit to sequentially perform normal display driving on each row of sub-pixels, wherein data voltages subjected to brightness compensation are written in each row of the sub-pixels to be compensated;
entering a first black insertion sub-period after the display driving period begins and the duration of the display black insertion driving interval passes, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on part of the sub-pixel rows;
and entering a second black insertion sub-period after the blank period is ended, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on one part of the sub-pixel rows and perform black insertion driving on the other part of the sub-pixel rows.
In a third aspect, an embodiment of the present disclosure provides a brightness compensation module, including:
one or more processors;
a memory having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the brightness compensation method as provided in the first aspect.
In a fourth aspect, an embodiment of the present disclosure provides a display device, including: the brightness compensation module as provided in the third aspect above.
In some embodiments, the display device includes a central control board including the brightness compensation module.
Drawings
FIG. 1 is a schematic top view of a display device in the practice of the present disclosure;
FIG. 2 is a schematic diagram of a circuit structure of a sub-pixel in a display substrate according to the present disclosure;
FIG. 3 is a timing diagram illustrating operation of the sub-pixel shown in FIG. 2;
FIG. 4 is a timing diagram illustrating another operation of the sub-pixel shown in FIG. 2;
FIG. 5 is a timing diagram illustrating two consecutive display periods of the display device according to the present disclosure;
fig. 6 is a flowchart of a brightness compensation method according to an embodiment of the disclosure;
FIG. 7 is a flowchart of an alternative implementation of step S101 in an embodiment of the present disclosure;
fig. 8 exemplarily shows the values of the display black insertion driving interval and the luminance boundary position at three different display frequencies;
fig. 9 is a flowchart of another brightness compensation method provided by the embodiment of the present disclosure;
FIG. 10a is a timing diagram illustrating the operation of driving the first frame in the embodiment of the present disclosure;
FIG. 10b is a timing diagram illustrating the driving of the second frame in the embodiment of the disclosure;
fig. 11 is a flowchart of another brightness compensation method provided by the embodiment of the present disclosure;
fig. 12 is a flowchart of an alternative implementation method of step S201 in the embodiment of the present disclosure;
fig. 13 is a schematic diagram illustrating a curve showing a corresponding relationship between a display frequency and a voltage gain compensation parameter when a sub-pixel row located above a luminance boundary is used as a sub-pixel row to be compensated according to the embodiment of the present disclosure;
fig. 14 is a schematic diagram illustrating a curve showing a corresponding relationship between a display frequency and a voltage gain compensation parameter when a sub-pixel row located below a luminance boundary is used as a sub-pixel row to be compensated in the embodiment of the present disclosure;
fig. 15 is a flowchart of another brightness compensation method according to an embodiment of the disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, a brightness compensation method, a brightness compensation module and a display device provided by the present invention are described in detail below with reference to the accompanying drawings.
The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. Likewise, the word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "coupled" or "connected," and the like, are not restricted to physical or mechanical couplings, but may include electrical couplings, whether direct or indirect.
The transistors used in the embodiments of the present disclosure may be thin film transistors or field effect transistors or other devices with the same characteristics. In this embodiment, the coupling modes of the drain and the source of each transistor may be interchanged, and thus, the drain and the source of each transistor in the embodiment of the present disclosure are not different. Here, only in order to distinguish two poles of the transistor except for the control electrode (i.e., the gate), one of the poles is referred to as a drain and the other pole is referred to as a source. The thin film transistor used in the embodiment of the present disclosure may be an N-type transistor or a P-type transistor. In the embodiment of the present disclosure, when an N-type thin film transistor is used, the first electrode thereof may be a source electrode, and the second electrode thereof may be a drain electrode. In the following embodiments, the thin film transistor is described as an N-type transistor.
In the present disclosure, an "active level signal" refers to a signal that can control the transistor to be turned on when the signal is input to the control electrode of the transistor, and an "inactive level signal" refers to a signal that can control the transistor to be turned off when the signal is input to the control electrode of the transistor. For an N-type transistor, a high level signal is an active level signal, and a low level signal is a non-active level signal; for a P-type transistor, the low level signal is an active level signal and the high level signal is an inactive level signal.
In the following description, the transistors will be described as N-type transistors as an example, and at this time, the active level signal refers to a high level signal and the inactive level signal refers to a low level signal. It is conceivable that when a P-type transistor is employed, the timing of the control signal needs to be adjusted accordingly. Specific details are not set forth herein but are intended to be within the scope of the present disclosure.
Fig. 1 is a schematic top view of a display device in the practice of the present disclosure. As shown in fig. 1, the display device 100 includes: the display device comprises a display area 101 and a peripheral area 102, wherein a plurality of sub-pixels 300 arranged in an array are arranged in the display area 101, each row of sub-pixels 300 is provided with a corresponding first gate line G1< i >, and i is an integer; it should be noted that 2160 first gate lines G1<1> to G1<2160> are exemplarily shown in fig. 1; a gate driving circuit 200 and a source driving circuit 400 are disposed in the peripheral region 102, and the gate driving circuit 200 includes: a plurality of shift register units (not shown in fig. 1) cascaded, each stage of the shift register units being connected to a corresponding first gate line G1< i > to provide a driving signal to a corresponding first gate line G1< i >; the source driving circuit 400 is connected to the corresponding column of sub-pixels 300 through the data line D to write the data voltage to the corresponding column of sub-pixels 300.
Fig. 2 is a schematic circuit diagram of a sub-pixel in a display substrate according to the disclosure, fig. 3 is a timing diagram of an operation of the sub-pixel shown in fig. 2, and fig. 4 is a timing diagram of another operation of the sub-pixel shown in fig. 2. As shown in fig. 2 to 4, the sub-pixel 300 includes: a pixel circuit and a light emitting element. In which the light emitting element is an Organic Light Emitting Diode (OLED) as an example.
The pixel circuit includes a data writing transistor QTFT (a control electrode connected to the first gate line G1), a driving transistor DTFT, a sensing transistor STFT (a control electrode connected to the second gate line G2, and a first electrode connected to the sensing signal line sequence), and a storage capacitor Cst. Referring to fig. 2 and 3, when the sub-pixel 300 is only required to perform the light emitting display, the operation process of the sub-pixel 300 includes a display data writing phase and a light emitting phase; during the stage of writing display Data, the first gate line G1 controls the Data writing transistor QTFT to be turned on, and the Data line Data writes the Data voltage Vdata to the control electrode of the driving transistor DTFT; in the light emitting stage, the driving transistor DTFT outputs a corresponding driving current according to the voltage at the control electrode thereof, so as to drive the light emitting element OLED to emit light.
It should be noted that, after one frame is finished, the driving transistor DTFT and the light-emitting element OLED in the pixel circuit may be externally subjected to complementary sensing by the sensing transistor, and the pixel circuit may be externally compensated based on the sensing result (for example, compensation of the threshold voltage of the driving transistor is performed). The specific sensing process and the compensation process are conventional in the art and will not be described herein.
Dynamic image smear occurs during the display operation, that is, when the display apparatus switches from one frame to another frame, the user feels the smear of the previous frame. One solution is: as shown in fig. 4, a black insertion process is performed during the pixel circuit lighting, which reduces the lighting Time and enhances the Moving Picture Response Time (MPRT), and the larger the MPRT, the lighter the smear.
In the related art, the display driving and the black insertion driving are integrated in the same gate driving circuit, that is, each stage of shift register in the gate driving circuit can be used for the display driving and the black insertion driving. The operation process of the gate driving circuit includes a display driving stage and a black insertion driving stage which are alternately performed, during one display driving stage, the signal output terminals of some stages of shift registers in the gate driving circuit sequentially output display driving signals (for example, pulse 1 in fig. 4) for performing display driving, and during one black insertion driving stage, the signal output terminals of some stages of shift registers in the gate driving circuit output black insertion driving signals (for example, pulse 2 in fig. 4) for performing black insertion driving. Generally, a plurality of display driving stages are required to write a complete frame of display data into each corresponding pixel.
Fig. 5 is an operation timing diagram of two consecutive frame display periods of the display device according to the present disclosure. As shown in fig. 5, the first gate line disposed on the ith row of sub-pixels is the first gate line G1< i >, and the operation timing of 2016 first gate lines G1<1> -G1 <2160> is exemplarily shown in the figure.
Since the display driving process and the black insertion driving process are not synchronized, a part of the sub-pixel rows can perform the display driving and the black insertion driving in the same frame display period, and the other part of the sub-pixel rows performs the normal driving in the current frame display period and performs the black insertion driving in the next adjacent frame display period. Taking the case shown in fig. 5 as an example, the sub-pixel rows of the 1 st to 12 th rows can perform normal driving and black insertion driving in the same frame display period, and the sub-pixel rows of the 13 th to 2160 th rows (the last row) perform normal driving in the current frame display period and perform black insertion driving in the next adjacent frame display period.
Since there is also a Blank period (also called Blank period, which may be generally used for sensing a certain sub-pixel row for external compensation) between the current frame display period and the adjacent next frame display period, the normal display time of the sub-pixel rows of the 1 st to 12 th rows is different from that of the sub-pixel rows of the 13 th to 2160 th rows. Specifically, the normal display time of the sub-pixel rows in the 13 th to 2160 th rows is longer than the normal display time of the sub-pixel rows in the 1 st to 12 th rows by a first interval period (i.e., one Blank period), so that the display luminance of the sub-pixel rows in the 1 st to 12 th rows is lower than the display luminance of the sub-pixel rows in the 13 th to 2160 th rows, that is, the display screen viewed by the user has a problem of "dark-up and bright-down"; furthermore, the user will also perceive a luminance boundary between the 12 th row of sub-pixel rows and the 13 th row of sub-pixel rows, and the luminance boundary between the 12 th row of sub-pixel rows and the 13 th row of sub-pixel rows will be more pronounced as the viewing time increases.
In view of the above technical problems, the problem of "dark above and bright below" on the display screen and the problem of "brightness boundary" viewed by the user can be improved by performing the brightness compensation process on the sub-pixel rows of the 1 st to 12 th rows to increase the equivalent brightness of the sub-pixel rows of the 1 st to 12 th rows, or performing the brightness compensation process on the sub-pixel rows of the 13 th to 2160 th rows to decrease the equivalent brightness of the sub-pixel rows of the 13 th to 2160 th rows.
In the present disclosure, performing brightness compensation on a sub-pixel specifically means: the data voltage written into the sub-pixel is adjusted according to the requirement to adjust the lighting brightness of the sub-pixel, so that the purpose of adjusting the equivalent brightness of the sub-pixel is achieved. For a single sub-pixel, the equivalent luminance (the display luminance actually sensed by human eyes) of the sub-pixel in a certain frame is equal to the product of the lighting luminance (the lighting luminance of the light-emitting element after the gray-scale voltage is applied) of the sub-pixel and the light-emitting duty ratio, that is, the equivalent luminance is the lighting luminance and the light-emitting duty ratio; the "light-emitting duty ratio" is a ratio of a lighting time of the light-emitting element in the sub-pixel to a time corresponding to one frame.
In the disclosed embodiment, there are two luminance compensation cases according to different needs: firstly, adjusting the data voltage to improve the lighting brightness of the sub-pixel, thereby improving the equivalent brightness of the sub-pixel in one frame; and secondly, adjusting the data voltage to reduce the lighting brightness of the sub-pixel, so that the equivalent brightness of the sub-pixel in one frame is reduced.
Take the case that the driving transistor shown in fig. 2 is an N-type transistor, and the Data voltage Vdata provided by the Data line Data is always greater than the operating voltage ELVDD as an example; at this time, the larger the data voltage Vdata is, the larger the driving current output from the driving transistor DTFT is, and the higher the lighting luminance of the light emitting element OLED is. Therefore, when the equivalent brightness of the sub-pixel needs to be improved, the equivalent brightness can be improved by increasing the data voltage written into the sub-pixel; this can be achieved by reducing the data voltage written to the sub-pixel when the equivalent luminance of the sub-pixel needs to be reduced.
In the embodiment of the present disclosure, the normal display time of each sub-pixel row above the luminance boundary (taking the case shown in fig. 5 as an example, namely, the sub-pixel rows from the 1 st row to the 12 th row) in one frame is t0, and the normal display time of each sub-pixel row below the luminance boundary (taking the case shown in fig. 5 as an example, namely, the sub-pixel rows from the 13 th row to the 2160 th row) in one frame is t0+ t _ blank, and t _ blank is the duration of one blank period. Under the condition that the lighting brightness of the light-emitting element is constant, the equivalent brightness of the sub-pixels is in direct proportion to the normal display time, so that the difference between the overall equivalent brightness above the brightness boundary and the overall equivalent brightness below the brightness boundary can be represented by the ratio Q of the normal display time of the sub-pixel row above the brightness boundary to the normal display time of the sub-pixel row below the brightness boundary; where Q is t0/(t0+ t _ blank), 0 < Q <1, and a larger Q indicates a smaller difference between the overall equivalent luminance located above the luminance boundary and the overall equivalent luminance located below the luminance boundary.
To compensate for the difference in the normal display time between the sub-pixel row above the luminance boundary and the sub-pixel row below the luminance boundary, the difference can be compensated by increasing the lighting luminance of the sub-pixel row above the luminance boundary or decreasing the lighting luminance of the sub-pixel row below the luminance boundary.
In the process of brightness compensation by increasing the lighting brightness of the sub-pixel row above the brightness boundary, a fixed voltage gain compensation parameter (set according to the actual compensation requirement and the Q value) is configured and recorded as gain _1, at which the gain _ 1> 1, the data voltage to be written into the sub-pixel (generally, the data voltage subjected to the external threshold compensation) is multiplied by the voltage gain compensation parameter to obtain the data voltage with the brightness compensation completed (i.e., the data voltage is increased), and when the data voltage with the brightness compensation completed is written into the sub-pixel, the lighting brightness of the sub-pixel can be increased.
In the process of performing brightness compensation by reducing the lighting brightness of the sub-pixel row located below the brightness boundary, a fixed voltage gain compensation parameter (set according to the actual compensation requirement and the Q value) is configured, which is denoted as gain _2, at which 0 < gain _2 <1, the data voltage to be written into the sub-pixel (generally, the data voltage subjected to external threshold compensation) is multiplied by the voltage gain compensation parameter to obtain the data voltage with the brightness compensation completed (i.e., the data voltage is reduced), and when the data voltage with the brightness compensation completed is written into the sub-pixel, the lighting brightness of the sub-pixel can be reduced.
Under the condition of a certain display frequency, the Blank period time is fixed, the value of Q is also fixed, and for the certain display frequency, a fixed voltage gain compensation parameter is configured to perform brightness compensation on the sub-pixel which is positioned above the brightness boundary or below the brightness boundary so as to improve the display brightness difference caused by that the normal display time of the sub-pixel row which is positioned below the brightness boundary is one Blank period more than the normal display time of the sub-pixel row which is positioned above the brightness boundary.
In practical application, the display device has a variable-frequency display scene, that is, the display device can display pictures at different display frequencies; specifically, the change in the display frequency is realized by lengthening or shortening the duration of the Blank period. At this time, it becomes important how the brightness is performed for different display frequencies (i.e., different durations of the Blank period).
Fig. 6 is a flowchart of a luminance compensation method according to an embodiment of the disclosure. As shown in fig. 6, the brightness compensation method provided by the embodiment of the present disclosure may be applied to a scene where a display device has a variable frequency display; the display device comprises a plurality of rows of sub-pixel rows, each frame is provided with a corresponding frame display period and a black insertion driving period, and the frame display period comprises: a display driving period and a blank period located after the display driving period, the black insertion driving period including: the display device comprises a first black insertion sub-period and a second black insertion sub-period, wherein the first black insertion sub-period is positioned after the starting time of the display driving period corresponding to the same frame of picture and before the blank period corresponding to the same frame of picture, and the second black insertion sub-period is positioned after the ending time of the blank period corresponding to the same frame of picture. The brightness compensation method provided by the embodiment of the disclosure comprises the following steps:
step S101, determining a display black insertion driving interval and a sub-pixel row to be compensated corresponding to a frame picture to be driven according to the display frequency of the frame picture to be driven.
The display black insertion driving interval is a time interval between the starting time of the display driving time interval and the starting time of the first black insertion sub-time interval in the driving process of the frame picture to be driven; the sub-pixel row to be compensated is a sub-pixel row to be subjected to black insertion driving in the first black insertion sub-period or a sub-pixel row to be subjected to black insertion driving in the second black insertion sub-period.
In the embodiment of the present disclosure, the sub-pixel row to be subjected to the black insertion driving in the first black insertion sub-period is the aforementioned sub-pixel row located above the luminance boundary, and the normal display time of the sub-pixel row to be subjected to the black insertion driving in the first black insertion sub-period is equal to or approximately equal to the black insertion driving interval. The sub-pixel row to be subjected to the black insertion drive in the second black insertion sub-period is the sub-pixel row located below the luminance boundary, and the normal display time of the sub-pixel row to be subjected to the black insertion drive in the first black insertion sub-period is equal to or approximately equal to the sum of the durations of the black insertion drive interval and the blank period.
For convenience of description, the duration of the black insertion driving interval is denoted as t0, and the duration of the blank period is denoted as t _ blank, then the normal display time of the sub-pixel row to be subjected to the black insertion driving in the first black insertion sub-period is equal to or approximately equal to t0, and the normal display time of the sub-pixel row to be subjected to the black insertion driving in the second black insertion sub-period is denoted as t0+ t _ blank, and the ratio Q of the two normal display times is t0/(t0+ t _ blank).
In the embodiment of the present disclosure, when the duration t0 of the black insertion driving interval changes, the duration of the first black insertion sub-period changes accordingly, the number of rows of sub-pixels to be subjected to black insertion driving in the first black insertion sub-period also changes accordingly, and the position of the luminance boundary (the luminance boundary is located between the last row of sub-pixels subjected to black insertion driving in the first black insertion sub-period and the first row of sub-pixels subjected to black insertion driving in the first black insertion sub-period) also changes accordingly. Illustratively, when t0 decreases, it indicates that the start time of the first black insertion sub-period moves forward, the number of sub-pixel rows to be subjected to black insertion driving in the first black insertion sub-period increases, and the position of the luminance boundary line moves downward (see the later cases shown in fig. 10a and 10 b); when t0 increases, it means that the start time of the first black insertion sub-period is shifted backward, the number of sub-pixel lines to be subjected to black insertion driving in the first black insertion sub-period decreases, and the position of the luminance boundary is shifted upward.
In step S101, the determination of the duration t0 of the black insertion driving interval is displayed, and the sub-pixel row to be subjected to the black insertion driving in the first black insertion sub-period and the sub-pixel row to be subjected to the black insertion driving in the second black insertion sub-period are also determined accordingly. As is apparent from the foregoing description, when luminance compensation is subsequently performed, a sub-pixel row (a sub-pixel row located above a luminance boundary) to be subjected to black insertion driving in the first black insertion sub-period may be selected as a sub-pixel row to be compensated, or a sub-pixel row (a sub-pixel row located below a luminance boundary) to be subjected to black insertion driving in the second black insertion sub-period may be selected as a sub-pixel row to be compensated, as necessary.
And S102, performing brightness compensation on the sub-pixel line to be compensated according to the pre-configured voltage gain compensation parameter.
In some embodiments, the voltage gain compensation parameters configured for different display frequencies are the same.
If the sub-pixel row to be subjected to the black insertion driving in the first black insertion sub-period (the sub-pixel row located above the brightness boundary) is selected as the sub-pixel row to be compensated in step S101, the sub-pixel to be compensated is subjected to the brightness compensation through the voltage gain compensation parameter in step S102, so that the lighting brightness of the sub-pixel to be compensated in the normal display process is improved.
If the sub-pixel row to be subjected to the black insertion driving in the second black insertion sub-period (the sub-pixel row located below the brightness boundary) is selected as the sub-pixel row to be compensated in step S101, the sub-pixel to be compensated is subjected to the brightness compensation by the voltage gain compensation parameter in step S102, so that the lighting brightness of the sub-pixel to be compensated in the normal display process is reduced.
In some embodiments, step S102 specifically includes: step S1021.
S1021, compensating the data voltage of the sub-pixel according to a pre-configured voltage gain compensation parameter aiming at any one sub-pixel in the sub-pixel row to be compensated; the compensated data voltage is Vdata', Vdata ═ Vdata × gain, Vdata is the data voltage before compensation, and gain is the voltage gain compensation parameter.
Taking the case where the lighting luminance of the light emitting element in the sub-pixel is higher as the data voltage written in the sub-pixel is higher as an example; if the sub-pixel row to be subjected to black insertion driving in the first black insertion sub-period is selected as the sub-pixel row to be compensated in step S101, the voltage gain compensation parameter gain configured in step S102 is greater than 1; if the sub-pixel row to be subjected to black insertion driving in the second black insertion sub-period is selected as the sub-pixel row to be compensated in step S101, the voltage gain compensation parameter gain configured in step S102 is greater than 0 and less than 1; it should be noted that the specific value of the voltage gain compensation parameter gain can be determined according to the actual requirement and the aforementioned Q value.
In the embodiment of the present disclosure, for different display frequencies, different black insertion driving intervals may be set to compensate for a change in the Q value due to a change in the duration t _ blank of the blank period; that is, when t _ blank is changed, the Q value is kept constant or changed slightly by adjusting the time period t0 of the display black insertion drive interval. Since the Q value remains unchanged or only slightly varies at different display frequencies, the same voltage gain compensation can be configured to perform the brightness compensation on the sub-pixel to be compensated in step S102, so as to improve or even completely eliminate the brightness boundary.
In the embodiment of the disclosure, the voltage gain compensation parameters configured for different display frequencies are the same, which facilitates compensation control.
It should be noted that the above algorithm for directly multiplying the data voltage by the voltage gain compensation parameter to compensate the data voltage is only an optional implementation in the present disclosure, and other algorithms may be adopted to compensate the data voltage based on the voltage gain compensation parameter in the embodiment of the present disclosure. Those skilled in the art will appreciate that other suitable algorithms for compensating the data voltage based on the voltage gain compensation parameter are within the scope of the present disclosure.
Fig. 7 is a flowchart of an alternative implementation method of step S101 in the embodiment of the present disclosure. As shown in fig. 7, in some embodiments, step S101 includes:
step S1011, acquiring a display frequency of the frame to be driven.
Step S1012, determining a display black insertion driving interval corresponding to the display frequency of the frame to be driven according to the pre-stored first corresponding relation data.
Alternatively, the first correspondence data includes display black insertion drive intervals corresponding to different display frequencies and display frequencies. At this time, in step S1012, the display black insertion driving interval corresponding to the display frequency of the frame picture to be driven is determined only by querying the first correspondence data. Since different display black insertion driving intervals can be configured for different display frequencies, respectively, variations in Q value due to variations in the duration t _ blank of the blank period can be accurately compensated, so that the Q value remains unchanged or changes slightly.
Generally, the larger the display frequency is, the smaller the duration t _ blank of the blank period is, and the larger the Q value is; in order to maintain the Q constant or produce a small change, t0 should be reduced accordingly. That is, the larger the display frequency is, the smaller the duration t0 of the display black insertion drive interval configured for the display frequency may be.
The values of the display black insertion drive interval and the luminance boundary position at three different display frequencies are exemplarily given in fig. 8. As shown in fig. 8, the display frequencies of the three cases shown in (a) (b) (c) are f1, f2, and f3, respectively, where f 1< f2 < f 3; (a) (b) the durations of the display black insertion driving intervals of the three cases shown in (c) are t0_1, t0_2, t0_3, t0_ 1> t0_2 > t0_3, respectively; (a) the luminance dividing lines of the three cases shown in (b) (c) are gradually shifted downward.
As still another alternative, the first correspondence data includes display frequency segments and display black insertion driving intervals corresponding to the display frequency segments. At this time, in step S1012, the display frequency segment to which the display frequency of the frame to be driven belongs is determined, and then the display black insertion driving interval corresponding to the display frequency segment to which the display frequency segment belongs is determined by querying the first corresponding relationship data. That is to say, some display frequencies that are relatively close to each other may correspond to the same display black insertion driving interval, and at this time, the data amount in the first corresponding relationship data may be effectively reduced while a certain compensation effect is ensured.
Illustratively, the duration of the black insertion driving interval corresponding to the 60HZ to 80HZ (including 60HZ, excluding 80HZ) display frequency bin is t0_1, the duration of the black insertion driving interval corresponding to the 80HZ to 100HZ (including 80HZ, excluding 100HZ) display frequency bin is t0_2, and the duration of the black insertion driving interval corresponding to the 100HZ to 120HZ (including 100HZ, excluding 120HZ) display frequency bin is t0_3, where t0_ 1> t0_2 > t0_ 3.
Fig. 9 is a flowchart of another brightness compensation method according to an embodiment of the disclosure. As shown in fig. 9, the brightness compensation method not only includes step S101 and step S102 in the previous embodiment, but also includes step S103 after step S102; for the specific description of step S101 and step S102, reference may be made to the contents in the foregoing embodiments, which are not repeated herein, and only step S103 is described in detail below.
And step S103, controlling the gate driving circuit and the source driving circuit to drive the frame picture to be driven according to the display data for displaying the black insertion driving interval and finishing the brightness compensation.
Step S103 includes:
and step S1031, in the display driving time period, controlling the gate driving circuit and the source driving circuit to sequentially perform normal display driving on each row of sub-pixels, wherein the data voltage subjected to brightness compensation is written in each row of the sub-pixels to be compensated.
Take the case where the display device comprises n rows of sub-pixel rows as an example.
In the display driving period, the grid electrode drives the grid electrode driving circuit to sequentially carry out normal display driving on the n rows of sub-pixel rows, and the source electrode driving circuit writes corresponding data voltage Vdata in each sub-pixel of the corresponding row in the process of carrying out normal display driving on each row of sub-pixels so as to ensure that each sub-pixel can carry out normal display. The data voltage written in the sub-pixels in the sub-pixel row to be compensated, which is determined in step S101, is the data voltage obtained after the luminance compensation process in step S102.
Step S1032 is to enter the first black insertion sub-period after the display driving period starts and the duration of the display black insertion driving interval elapses, and control the gate driving circuit and the source driving circuit to perform black insertion driving on part of the sub-pixel rows.
Step S1033, entering a second black insertion sub-period after the blank period ends, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on part of the sub-pixel rows and perform black insertion driving on the other part of the sub-pixel rows.
In the process of black insertion driving, the sub-pixels of the a row positioned in the 1 st to the a th rows (1 < a < n and a is an integer) are subjected to black insertion driving in a first black insertion sub-period, and the sub-pixel rows of the n-a row positioned in the a +1 th to the n th rows are subjected to black insertion driving after the starting time of a blank period corresponding to a first frame picture; at this time, the normal display time of the sub-pixel rows of the n-a row located from the a +1 th row to the n-th row is longer than the normal display time of the sub-pixel rows of the a-a row from the 1 st row to the a-th row (about the time length of 1 Blank period longer).
Fig. 10a is an operation timing chart of driving the first frame in the embodiment of the present disclosure, and fig. 10b is an operation timing chart of driving the second frame in the embodiment of the present disclosure. As shown in fig. 10a and 10b, n is 2160, and the first gate line disposed in the ith row of sub-pixel lines is the first gate line G1< i >, and the operation timings of 2016 first gate lines G1<1> -G1 <2160> are exemplarily shown in the drawings. Wherein the total duration of the display drive period (showing the time interval between the start timing of the drive period and the start timing of the blank period) is j 2.
The display frequency f1 of the first frame picture is less than the display frequency f2 of the second frame picture, and the duration of the blank period corresponding to the first frame picture is T3_1 and is greater than the duration of the blank period of the second frame picture T3_ 2; the duration t0_1 of the display black insertion drive interval determined for the display frequency f1 is greater than the duration t0_2 of the display black insertion drive interval determined for the display frequency f 1.
In the driving of the first frame picture shown in fig. 10a, the sub-pixel rows of the 1 st to 2160 th rows are sequentially subjected to the normal display driving within the corresponding display driving period T1; in performing the black insertion driving, the sub-pixel rows located in the 1 st to 12 th rows in the first black insertion sub-period p1 corresponding to the black insertion driving period T2 are subjected to the black insertion driving, and the sub-pixel rows located in the 13 th to 2160 th rows in the second black insertion sub-period p2 corresponding to the black insertion driving period T2 are subjected to the black insertion driving with the luminance dividing line located between the 12 th row sub-pixel row and the 13 th row sub-pixel row.
In the driving of the second frame picture shown in fig. 10b, the sub-pixel rows of the 1 st to 2160 th rows are sequentially subjected to the normal display driving within the corresponding display driving period T1; in performing the black insertion driving, the sub-pixel rows located in the 1 st to 16 th rows in the first black insertion sub-period p1 corresponding to the black insertion driving period T2 are subjected to the black insertion driving, and the sub-pixel rows located in the 17 th to 2160 th rows in the second black insertion sub-period p2 corresponding to the black insertion driving period T2 are subjected to the black insertion driving with the luminance dividing line located between the 16 th row sub-pixel row and the 17 th row sub-pixel row.
As can be seen from fig. 10a and 10b, the duration of the black insertion driving interval decreases, the start timing of the first black insertion sub-period advances, the number of sub-pixel rows to be subjected to black insertion driving in the first black insertion sub-period increases, and the position of the luminance boundary shifts downward.
In the process of performing black insertion driving, in order to reduce the time occupied by black insertion driving as much as possible, sub-pixel rows are often grouped and black insertion driving is performed by groups. In some embodiments, the n rows of sub-pixel rows are divided into s sub-pixel row groups arranged in sequence, each sub-pixel row group including c rows of sub-pixel rows, and s × c ═ n. In the process of performing black insertion driving on a plurality of rows of sub-pixel rows in the first black insertion sub-period p1 or the second black insertion sub-period p2, black insertion driving is performed on each sub-pixel row group in units of sub-pixel row groups, and sub-pixel rows located in the same sub-pixel row group are simultaneously performed in the same period t 2.
It should be noted that fig. 10a and fig. 10b only exemplify the case where c is 4, s is 540, and n is 2160, and this case only serves as an example, and does not limit the technical solution of the present disclosure.
In some embodiments, in the first black insertion sub-period p1 or the second black insertion sub-period p2, a time interval of starting time at which the black insertion driving of the adjacent sub-pixel row group is started is H, where H is c H, and H is a time duration corresponding to the black insertion driving of one row of sub-pixel rows.
In some embodiments, the display driving period includes: s display driving sub-periods t1 corresponding to the sub-pixel row groups one by one, wherein a time interval exists between any two adjacent display driving sub-periods t1, the time interval is greater than h, and h is the duration corresponding to black insertion driving of a row of sub-pixel rows; the period t2 during which any one of the sub-pixel row groups performs black insertion driving is located in the time interval between the adjacent two display driving sub-periods t 1.
Fig. 11 is a flowchart of another brightness compensation method according to an embodiment of the disclosure. As shown in fig. 11, the brightness compensation method provided by the embodiment of the present disclosure may be applied to a scene where a display device has a variable frequency display; the display device comprises a plurality of rows of sub-pixel rows, each frame is provided with a corresponding frame display period and a black insertion driving period, and the frame display period comprises: a display driving period and a blank period located after the display driving period, the black insertion driving period including: the display device comprises a first black insertion sub-period and a second black insertion sub-period, wherein the first black insertion sub-period is positioned after the starting time of the display driving period corresponding to the same frame of picture and before the blank period corresponding to the same frame of picture, and the second black insertion sub-period is positioned after the ending time of the blank period corresponding to the same frame of picture. The brightness compensation method provided by the embodiment of the disclosure comprises the following steps:
step S201, determining a voltage gain compensation parameter corresponding to the frame picture to be driven according to the display frequency of the frame picture to be driven.
Step S202, performing brightness compensation on the sub-pixel row to be compensated according to the voltage gain compensation parameter, wherein the sub-pixel row to be compensated is a sub-pixel row to be subjected to black insertion driving in the first black insertion sub-period or a sub-pixel row to be subjected to black insertion driving in the second black insertion sub-period.
In some embodiments, step S202 includes: step S2021.
Step S2021, compensating the data voltage of the sub-pixel according to a pre-configured voltage gain compensation parameter aiming at any one sub-pixel in the sub-pixel row to be compensated; the compensated data voltage is Vdata', Vdata ═ Vdata × gain, Vdata is the data voltage before compensation, and gain is the voltage gain compensation parameter.
Unlike the foregoing embodiment in which the duration of the display black insertion driving interval is adjusted according to the display frequency, the voltage gain compensation parameter is adjusted according to the display frequency in this embodiment. In some embodiments, the display black insertion driving intervals and the rows of the sub-pixels to be compensated configured at different display frequencies in the display device are the same; the display black insertion driving interval is a time interval between a start time of the display driving period and a start time of the first black insertion sub-period in a driving process of a frame picture to be driven. That is to say, in the embodiment of the present disclosure, for different display frequencies, the duration t0 of the display black insertion driving interval may be kept constant, and the row of sub-pixels to be compensated may also be kept constant, at this time, the foregoing Q value may change with the change of the duration t _ blank of the blank period; that is, for different display frequencies, the difference between the overall equivalent luminance above the luminance boundary and the overall equivalent luminance below the luminance boundary is different, so different voltage gain compensation parameters can be used to perform luminance compensation on the sub-pixel row to be compensated (a sub-pixel row to be subjected to black insertion driving in the first black insertion sub-period or a sub-pixel row to be subjected to black insertion driving in the second black insertion sub-period is predetermined as the sub-pixel row to be compensated, and the specific description can refer to the related contents above).
If a sub-pixel row (a sub-pixel row above the brightness boundary) to be subjected to black insertion driving in the first black insertion sub-period is predetermined as a sub-pixel row to be compensated, the voltage gain compensation parameter gain determined in step S201 is greater than 1; if the sub-pixel row to be subjected to the black insertion driving in the second black insertion sub-period is predetermined as the sub-pixel row to be compensated (the sub-pixel row located below the luminance dividing line), the voltage gain compensation parameter gain determined in step S102 is greater than 0 and less than 1.
Fig. 12 is a flowchart of an alternative implementation method of step S201 in the embodiment of the present disclosure. As shown in fig. 12, in some embodiments, step S201 includes:
and step S2011, acquiring the display frequency of the frame picture to be driven.
Step S2012, determining a voltage gain compensation parameter corresponding to the display frequency of the frame to be driven according to the pre-stored second corresponding relation data.
As an alternative, the second correspondence data includes different display frequencies and voltage gain compensation parameters corresponding to the display frequencies. At this time, in step S2012, the voltage gain compensation parameter corresponding to the display frequency of the frame to be driven is determined only by querying the second corresponding relationship data. Because different voltage gain compensation parameters can be configured for different display frequencies, the problem of 'dark top and bright bottom' of a display picture caused by the change of the time length t _ blank of the blank period can be accurately compensated.
In general, the larger the display frequency, the smaller the time period t _ blank of the blank period, the larger the Q value, and the smaller the difference between the overall equivalent luminance above the luminance boundary and the overall equivalent luminance below the luminance boundary, the smaller the degree of adjustment for the luminance at the time of the luminance compensation.
Fig. 13 is a schematic graph illustrating a corresponding relationship between a display frequency and a voltage gain compensation parameter when a sub-pixel row located above a luminance boundary is used as a sub-pixel row to be compensated according to an embodiment of the disclosure. As shown in fig. 13, if the sub-pixel row above the luminance boundary is used as the sub-pixel row to be compensated, the voltage gain compensation parameter (the voltage gain compensation parameter is greater than 1) corresponding to the display frequency may be decreased as the display frequency increases. Illustratively, in FIG. 13, b 1< b2 < b3, 1< a3 < a2 < a 1.
Fig. 14 is a schematic diagram illustrating a curve of a corresponding relationship between a display frequency and a voltage gain compensation parameter when a sub-pixel row located below a luminance boundary is used as a sub-pixel row to be compensated in the embodiment of the present disclosure, and as shown in fig. 14, if a sub-pixel row located above the luminance boundary is used as a sub-pixel row to be compensated, a voltage gain compensation parameter (a voltage gain compensation parameter is greater than 1) corresponding to the display frequency may be correspondingly increased as the display frequency is increased. Illustratively, in FIG. 14, b 1< b2 < b3, 0 < a 1< a2 < a3 < 1.
As another alternative, the second correspondence data includes different display frequency bands and voltage gain compensation parameters corresponding to the display frequency bands. At this time, in step S2012, a display frequency segment to which the display frequency of the frame to be driven belongs is determined, and then the voltage gain compensation parameter corresponding to the display frequency segment to which the display frequency segment belongs is determined by querying the second corresponding relationship data. That is, some display frequencies that are relatively close to each other may correspond to the same voltage gain compensation parameter, and at this time, the data amount in the second corresponding relationship data may be effectively reduced while a certain compensation effect is ensured.
Illustratively, the voltage gain compensation parameter for the display frequency bands of 60HZ to 80HZ (with 60HZ, without 80HZ) is gain1_1, the voltage gain compensation parameter for the display frequency bands of 80HZ to 100HZ (with 80HZ, without 100HZ) is gain1_2, and the voltage gain compensation parameter for the display frequency bands of 100HZ to 120HZ (with 100HZ, without 120HZ) is gain1_3, wherein 1< gain1_ 1< gain1_2 < gain1_ 3.
Fig. 15 is a flowchart of another brightness compensation method according to an embodiment of the disclosure. As shown in fig. 15, the brightness compensation method not only includes step S201 and step S202 in the previous embodiment, but also includes step S203 after step S202; for the specific description of step S1201 and step S202, reference may be made to the contents in the foregoing embodiment, which is not repeated herein, and only step S203 is described in detail below.
And step S203, controlling the gate driving circuit and the source driving circuit to drive the frame picture to be driven according to the display black insertion driving interval acquired in advance and the display data completing the brightness compensation.
Step S203 includes:
step S2031, in the display driving time period, the gate driving circuit and the source driving circuit are controlled to sequentially perform normal display driving on each row of sub-pixels, wherein data voltage subjected to brightness compensation is written in each row of the sub-pixels to be compensated.
Step S2032, entering a first black insertion sub-period after the display driving period starts and the duration of the display black insertion driving interval elapses, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on part of the sub-pixel rows.
Step S2033, entering a second black insertion sub-period after the blank period ends, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on part of the sub-pixel rows and perform black insertion driving on the other part of the sub-pixel rows.
For specific contents of step S203 and steps S2031 to S2033, reference may be made to the related description of step S103 and steps S1031 to S1033, and details thereof are not repeated here.
Based on the same inventive concept, the embodiment of the present disclosure further provides a brightness compensation module, which includes: one or more processors and memory, the memory having one or more programs stored thereon; the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the steps in the brightness compensation method as provided in any of the preceding embodiments.
It should be noted that the processor is a device with data processing capability, and includes but is not limited to a Central Processing Unit (CPU), etc.; memory is a device with data storage capabilities including, but not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), FLASH memory (FLASH). The first/second processor and the first/second storage device can be connected through an I/O interface to realize information interaction between the first/second processor and the first/second storage device, and the I/O interface includes, but is not limited to, a data Bus (Bus) and the like.
Based on the same inventive concept, the disclosed embodiments also provide a display device including the brightness compensation module as provided in the previous embodiments.
The display device in the embodiment of the present disclosure may be any product or component having a display function, such as a flexible wearable device, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
In some embodiments, the display device includes a central control board (TCON board, also called a screen driving board or a logic board) which can control the gate driving circuit and the source driving circuit to operate, and the central control board includes the brightness compensation module. That is, the brightness compensation module may be integrated within the central control board.
It will be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (13)

1. A brightness compensation method is applied to a display device, the display device comprises a plurality of rows of sub-pixel rows, each frame is configured with a corresponding frame display period and a black insertion driving period, the frame display period comprises: a display driving period and a blank period located after the display driving period, the black insertion driving period including: a first black insertion sub-period and a second black insertion sub-period, the first black insertion sub-period being located after a start time of the display driving period corresponding to the same frame picture and before the blank period corresponding to the same frame picture, the second black insertion sub-period being located after an end time of the blank period corresponding to the same frame picture;
the brightness compensation method includes:
determining a display black insertion driving interval and a sub-pixel row to be compensated corresponding to a frame picture to be driven according to the display frequency of the frame picture to be driven, wherein the display black insertion driving interval is a time interval between the starting time of the display driving time interval and the starting time of the first black insertion sub-time interval in the driving process of the frame picture to be driven, and the sub-pixel row to be compensated is a sub-pixel row to be subjected to black insertion driving in the first black insertion sub-time interval or a sub-pixel row to be subjected to black insertion driving in the second black insertion sub-time interval;
and performing brightness compensation on the sub-pixel line to be compensated according to a pre-configured voltage gain compensation parameter.
2. The brightness compensation method according to claim 1, wherein the brightness compensation of the sub-pixel row to be compensated according to the pre-configured voltage gain compensation parameter comprises:
compensating the data voltage of the sub-pixel according to a pre-configured voltage gain compensation parameter aiming at any one sub-pixel in the sub-pixel row to be compensated;
the compensated data voltage is Vdata', Vdata ═ Vdata × gain, Vdata is the data voltage before compensation, and gain is the voltage gain compensation parameter.
3. The luminance compensation method according to claim 1, wherein the voltage gain compensation parameters configured for different display frequencies are the same in the display device.
4. The luminance compensation method as claimed in claim 1, wherein the step of determining the display black insertion driving interval corresponding to the frame picture to be driven according to the display frequency of the frame picture to be driven comprises:
acquiring the display frequency of the frame picture to be driven;
determining a display black insertion driving interval corresponding to the display frequency of the frame picture to be driven according to pre-stored first corresponding relation data;
the first correspondence data includes different display frequencies and display black insertion driving intervals corresponding to the display frequencies, or the first correspondence data includes different display frequency bands and display black insertion driving intervals corresponding to the display frequency bands.
5. The luminance compensation method according to any one of claims 1 to 4, further comprising, after the step of luminance compensating the sub-pixel row to be compensated according to the pre-configured voltage gain compensation parameter:
controlling a gate driving circuit and a source driving circuit to drive the frame picture to be driven according to the display black insertion driving interval and the display data completing the brightness compensation, comprising:
in the display driving time period, controlling the gate driving circuit and the source driving circuit to sequentially perform normal display driving on each row of sub-pixels, wherein data voltages subjected to brightness compensation are written in each row of the sub-pixels to be compensated;
entering a first black insertion sub-period after the display driving period begins and the duration of the display black insertion driving interval passes, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on part of the sub-pixel rows;
and entering a second black insertion sub-period after the blank period is ended, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on one part of the sub-pixel rows and perform black insertion driving on the other part of the sub-pixel rows.
6. A brightness compensation method is applied to a display device, the display device comprises a plurality of rows of sub-pixel rows, each frame is configured with a corresponding frame display period and a black insertion driving period, the frame display period comprises: a display driving period and a blank period located after the display driving period, the black insertion driving period including: a first black insertion sub-period and a second black insertion sub-period, the first black insertion sub-period being located after a start time of the display driving period corresponding to the same frame picture and before the blank period corresponding to the same frame picture, the second black insertion sub-period being located after an end time of the blank period corresponding to the same frame picture;
the brightness compensation method includes:
determining a voltage gain compensation parameter corresponding to a frame picture to be driven according to the display frequency of the frame picture to be driven;
and performing brightness compensation on the sub-pixel row to be compensated according to the voltage gain compensation parameter, wherein the sub-pixel row to be compensated is the sub-pixel row to be subjected to black insertion driving in the first black insertion sub-period or the sub-pixel row to be subjected to black insertion driving in the second black insertion sub-period.
7. The brightness compensation method according to claim 6, wherein the step of performing brightness compensation on the sub-pixel row to be compensated according to the voltage gain compensation parameter comprises:
compensating the data voltage of the sub-pixel according to a pre-configured voltage gain compensation parameter aiming at any one sub-pixel in the sub-pixel row to be compensated;
the compensated data voltage is Vdata', Vdata ═ Vdata × gain, Vdata is the data voltage before compensation, and gain is the voltage gain compensation parameter.
8. The luminance compensation method according to claim 6, wherein, in the display device, the black insertion driving intervals of the display and the rows of the sub-pixels to be compensated configured for different display frequencies are the same;
the display black insertion driving interval is a time interval between a start time of the display driving period and a start time of the first black insertion sub-period in a driving process of the frame picture to be driven.
9. The luminance compensation method as claimed in claim 6, wherein the step of determining the voltage gain compensation parameter corresponding to the frame to be driven according to the display frequency of the frame to be driven comprises:
acquiring the display frequency of the frame picture to be driven;
determining a voltage gain compensation parameter corresponding to the display frequency of the frame picture to be driven according to pre-stored second corresponding relation data;
the second corresponding relation data is recorded with different display frequencies and voltage gain compensation parameters corresponding to the display frequencies, or the second corresponding relation data is recorded with different display frequency segments and voltage gain compensation parameters corresponding to the display frequency segments.
10. The luminance compensation method according to any one of claims 6 to 9, further comprising, after the step of luminance compensating the sub-pixel row to be compensated according to the pre-configured voltage gain compensation parameter:
controlling a gate driving circuit and a source driving circuit to drive the frame picture to be driven according to the pre-acquired display black insertion driving interval and the display data completing the brightness compensation, comprising:
in the display driving time period, controlling the gate driving circuit and the source driving circuit to sequentially perform normal display driving on each row of sub-pixels, wherein data voltages subjected to brightness compensation are written in each row of the sub-pixels to be compensated;
entering a first black insertion sub-period after the display driving period begins and the duration of the display black insertion driving interval passes, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on part of the sub-pixel rows;
and entering a second black insertion sub-period after the blank period is ended, and controlling the gate driving circuit and the source driving circuit to perform black insertion driving on one part of the sub-pixel rows and perform black insertion driving on the other part of the sub-pixel rows.
11. An illumination compensation module, comprising:
one or more processors;
a memory having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the brightness compensation method of any of claims 1-10.
12. A display device, comprising: the illumination compensation module of claim 11.
13. The display device of claim 12, wherein the display device comprises a central control board, the central control board comprising the brightness compensation module.
CN202111261996.8A 2021-10-28 2021-10-28 Brightness compensation method, brightness compensation module and display device Active CN113920939B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111261996.8A CN113920939B (en) 2021-10-28 2021-10-28 Brightness compensation method, brightness compensation module and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111261996.8A CN113920939B (en) 2021-10-28 2021-10-28 Brightness compensation method, brightness compensation module and display device

Publications (2)

Publication Number Publication Date
CN113920939A CN113920939A (en) 2022-01-11
CN113920939B true CN113920939B (en) 2022-09-16

Family

ID=79243409

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111261996.8A Active CN113920939B (en) 2021-10-28 2021-10-28 Brightness compensation method, brightness compensation module and display device

Country Status (1)

Country Link
CN (1) CN113920939B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023151014A1 (en) * 2022-02-11 2023-08-17 京东方科技集团股份有限公司 Display panel, driving method therefor, and display device
CN116386519B (en) * 2023-05-09 2023-10-24 集创北方(成都)科技有限公司 LED driving circuit, driving method, chip and display device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007333997A (en) * 2006-06-15 2007-12-27 Sony Corp Display controller, display device, terminal device, display control method and computer program
US8736535B2 (en) * 2007-03-29 2014-05-27 Nlt Technologies, Ltd. Hold type image display system
CN110322833B (en) * 2018-03-30 2021-02-12 上海和辉光电股份有限公司 Display driving method, method for controlling light emission of display panel and display panel
KR102540108B1 (en) * 2018-10-26 2023-06-07 삼성디스플레이 주식회사 Display device supporting a variable frame mode, and method of operating a display device
KR102573918B1 (en) * 2018-11-13 2023-09-04 엘지디스플레이 주식회사 Display Device And Driving Method Of The Same
KR20200067267A (en) * 2018-12-03 2020-06-12 삼성디스플레이 주식회사 Method of adjusting luminance of a backlight unit included in a liquid crystal display device
US11373607B2 (en) * 2020-03-16 2022-06-28 Novatek Microelectronics Corp. Display device and driving method thereof for reducing flicker due to refresh rate variation
CN112365832A (en) * 2020-12-08 2021-02-12 深圳市华星光电半导体显示技术有限公司 Gamma voltage correction method and device
CN112885299B (en) * 2021-01-22 2022-06-24 合肥京东方卓印科技有限公司 Display brightness compensation method, compensation circuit and display device

Also Published As

Publication number Publication date
CN113920939A (en) 2022-01-11

Similar Documents

Publication Publication Date Title
CN110148384B (en) Array substrate, display panel and driving method of pixel driving circuit
US10762851B2 (en) Timing controller and display device including the same
US20190206329A1 (en) Display device and electronic device including the same
CN113920939B (en) Brightness compensation method, brightness compensation module and display device
US8830147B2 (en) Display apparatus and electronic device using the same
US11355057B2 (en) Scan-type display apparatus and driving device thereof
CN112309323A (en) Display with gate driver circuitry including shared register circuitry
US11404011B2 (en) Scan-type display apparatus, in which refreshing of images on a display thereof can occur when a line scan cycle of a light emitting diode array of the display ends, and driving method thereof
CN110379351B (en) Display panel driving method, display panel and display device
US11574591B2 (en) Display device
CN110930952A (en) Liquid crystal display device
KR102108516B1 (en) Device with mip(memory inside pixel) display
US8847999B2 (en) Display device, method for driving the same, and electronic unit
US11244629B2 (en) Scan driver and display device
CN113436583A (en) Display panel and driving method thereof
US11289034B2 (en) Display device performing local dimming
US10255845B2 (en) Gate driver and a display apparatus including the same
CN115966186A (en) Control device, display device, and control method
US20210304692A1 (en) Scan-type display apparatus and driving device thereof
JP2010145709A (en) Image display device
US20110109817A1 (en) Display device, method of driving the same, and electronic unit
KR102460501B1 (en) Display device and method of driving the same
WO2023000203A1 (en) Driving method for display apparatus, display drive circuit, and display apparatus
US11922885B2 (en) Display panel and display driving method for display panel and display apparatus
CN113380195B (en) Display device and method for controlling the same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant