CN110610680A - Display method, display panel, display device, luminance correction method, and storage medium - Google Patents

Display method, display panel, display device, luminance correction method, and storage medium Download PDF

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Publication number
CN110610680A
CN110610680A CN201910939336.7A CN201910939336A CN110610680A CN 110610680 A CN110610680 A CN 110610680A CN 201910939336 A CN201910939336 A CN 201910939336A CN 110610680 A CN110610680 A CN 110610680A
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sub
display
pixels
pixel
display panel
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张文帅
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Wuhan Tianma Microelectronics Co Ltd
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Wuhan Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]

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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 invention provides a display method, a display panel, a display device, a brightness correction method and a storage medium. The display area of the display panel comprises a first display area and a second display area, the display area comprises a plurality of sub-pixels, the plurality of sub-pixels comprise a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first sub-pixels are located in the first display area, the plurality of second sub-pixels are located in the second display area, the density of the plurality of first sub-pixels is smaller than that of the plurality of second sub-pixels, and the display method comprises the following steps: when the display panel displays, the working current density of the first sub-pixel is larger than that of the second sub-pixel; after the display panel displays for a period of time, the working current densities of the plurality of first sub-pixels are corrected, and the brightness of the first display area is controlled to be the same as that of the second display area. According to the invention, after the display panel displays for a period of time, the working current densities of the plurality of first sub-pixels are corrected, so that the display split screen can be avoided.

Description

Display method, display panel, display device, luminance correction method, and storage medium
[ 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 method, a display panel, a display device, a brightness correction method, and a storage medium.
[ background of the invention ]
At present, researchers consider the implementation of the optical elements under the screen in order to achieve a truly comprehensive screen. The optical element such as a camera is arranged below the light-emitting device of the display panel, namely the optical element is arranged in the display area, the position of the optical element can be normally displayed, and when the optical element is required to be used, light penetrates through the display panel to reach the optical element and is finally utilized by the optical element. The light emitting devices occupy a larger space in the display area, and the amount of light that can be received by the optical element is smaller, which affects the usability of the optical element.
In order to increase the amount of light that can be received by the optical element, the prior art solution is to reduce the pixel density of the area (defined as the first display area) where the optical element is located, and after the pixel density is reduced, the display brightness of the area may be different from that of the normal display area (defined as the second display area). In order to achieve the uniformity of the overall brightness of the display area in normal use, the prior art adopts a scheme that the working current density of the sub-pixels in the first display area is set to be greater than the working current density of the sub-pixels in the second display area when the display area is shipped. The lifetime of the sub-pixels in the first display region is more attenuated if the operating current density of the sub-pixels in the first display region is higher, so that the lifetime of the sub-pixels in the two regions is attenuated to different degrees. After the display panel is shipped from a factory and displayed for a period of time, due to different degrees of life attenuation of the sub-pixels in the two areas, the brightness of the first display area and the brightness of the second display area are different, and split display is caused.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a display method, a brightness correction method, a display panel, a device, and a storage medium, so as to solve the problem in the prior art that after the display panel is shipped and displayed for a period of time, the brightness of the first display area and the brightness of the second display area are different due to different degrees of lifetime attenuation of sub-pixels in the two areas, resulting in split display.
In a first aspect, an embodiment of the present invention provides a display method of a display panel, where a display area of the display panel includes a first display area and a second display area, the display area includes a plurality of sub-pixels, the plurality of sub-pixels includes a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first sub-pixels are located in the first display area, the plurality of second sub-pixels are located in the second display area, and a density of the plurality of first sub-pixels is smaller than a density of the plurality of second sub-pixels, the display method includes:
when the display panel displays, the working current density of the first sub-pixel is larger than that of the second sub-pixel;
after the display panel displays for a period of time, the working current densities of the plurality of first sub-pixels are corrected, and the brightness of the first display area is controlled to be the same as that of the second display area.
In a second aspect, based on the same inventive concept, an embodiment of the present invention further provides a display panel, where a display area of the display panel includes a first display area and a second display area, the display area includes a plurality of sub-pixels, the plurality of sub-pixels includes a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first sub-pixels are located in the first display area, the plurality of second sub-pixels are located in the second display area, and a density of the plurality of first sub-pixels is less than a density of the plurality of second sub-pixels; when the display panel displays, the working current density of the first sub-pixel is larger than that of the second sub-pixel;
the display panel also comprises a brightness correction module, wherein the brightness correction module is used for correcting the working current density of the plurality of first sub-pixels after the display panel displays for a period of time, and controlling the brightness of the first display area to be the same as that of the second display area.
In a third aspect, based on the same inventive concept, an embodiment of the present invention further provides a display device, including any one of the display panels provided in the embodiments of the present invention.
In a fourth aspect, based on the same inventive concept, an embodiment of the present invention further provides a brightness correction method for a display panel, where the display area of the display panel includes a first display area and a second display area, the display area includes a plurality of sub-pixels, the plurality of sub-pixels includes a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first sub-pixels are located in the first display area, the plurality of second sub-pixels are located in the second display area, a density of the plurality of first sub-pixels is smaller than a density of the plurality of second sub-pixels, and when the display panel displays a display image, an operating current density of the first sub-pixels is greater than an operating current density of the second sub-pixels, the display panel further includes a display driving module and a brightness correction module, and the brightness correction method includes:
sending an instruction for displaying a monochromatic picture to a display driving module, and controlling a display panel to display the monochromatic picture;
and according to the operation of a user, sending an instruction for adjusting the positive power supply signal or the data signal and a corresponding instruction value to the brightness correction module, and controlling the brightness of the first display area to be the same as that of the second display area, wherein the instruction value comprises the adjusted positive power supply signal or the instruction value comprises the adjusted data signal.
In a fifth aspect, based on the same inventive concept, an embodiment of the present invention further provides a storage medium, where a computer program is stored in the storage medium, and when the computer program is executed by a processor, the brightness correction method provided by the embodiment of the present invention is implemented.
The display method, the display panel and the device, the brightness correction method and the storage medium provided by the invention have the following beneficial effects:
the invention is applied to the display panel with the display areas having different pixel density areas, after the whole display panel is displayed for a period of time with the same brightness, the working current density of a plurality of first sub-pixels in the first display area with smaller pixel density is corrected, and the plurality of first sub-pixels work under the corrected working current density, so that the brightness of the first display area is approximately the same as the brightness of the second display area. Through correcting the working current density of the first sub-pixel, the brightness of the first display area is compensated, the brightness difference between the first display area and the second display area after long-time use is improved, the display area of the display panel is prevented from being divided into screens, and the display effect is improved.
[ 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 view of a display panel to which the display method of the embodiment of the invention is applied;
FIG. 2 is a flowchart of a display method according to an embodiment of the present invention;
FIG. 3 is a flowchart of an alternative embodiment of a display method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a pixel circuit in a display panel to which the display method of the present invention is applicable;
FIG. 5 is a timing diagram of the pixel circuit illustrated in FIG. 4;
FIG. 6 is a flowchart of another alternative embodiment of a display method according to an embodiment of the present invention;
FIG. 7 is a graph of luminous efficiency versus time for sub-pixels configured to emit blue light at different current densities;
FIG. 8 is a flowchart of another alternative embodiment of a display method according to an embodiment of the present invention;
FIG. 9 is a flowchart of another alternative embodiment of a display method according to an embodiment of the present invention;
FIG. 10 is a flowchart of another alternative embodiment of a display method according to an embodiment of the present invention;
FIG. 11 is a partial schematic view of a display panel to which a display method according to an embodiment of the present invention can be applied;
FIG. 12 is a flowchart of another alternative embodiment of a display method according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of an alternative embodiment of a display panel according to an embodiment of the invention;
FIG. 14 is a schematic diagram of another alternative embodiment of a display panel according to an embodiment of the invention;
FIG. 15 is a schematic diagram of another alternative embodiment of a display panel according to an embodiment of the invention;
FIG. 16 is a modular block diagram of an alternative implementation of a display panel provided by an embodiment of the present invention;
FIG. 17 is a modular block diagram of an alternative implementation of a display panel provided by an embodiment of the invention;
FIG. 18 is a modular block diagram of an alternative implementation of a display panel provided by an embodiment of the invention;
FIG. 19 is a modular block diagram of an alternative implementation of a display panel provided by an embodiment of the invention;
FIG. 20 is a schematic diagram of an alternative implementation of a display panel according to an embodiment of the invention;
FIG. 21 is a schematic view of a display device according to an embodiment of the present invention;
fig. 22 is a flowchart of a luminance correcting 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.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
An embodiment of the present invention provides a display method of a display panel, which is suitable for the display panel shown in fig. 1, and fig. 1 is a schematic view of the display panel suitable for the display method provided in the embodiment of the present invention. As shown in fig. 1, the display area AA of the display panel includes a first display area AA1 and a second display area AA2, the display area AA includes a plurality of sub-pixels sp including a plurality of first sub-pixels sp1 and a plurality of second sub-pixels sp2, the plurality of first sub-pixels sp1 are located in the first display area AA1, the plurality of second sub-pixels sp2 are located in the second display area AA2, a density of the plurality of first sub-pixels sp1 is smaller than a density of the plurality of second sub-pixels sp2, that is, a pixel density of the first display area AA1 is smaller than a pixel density of the second display area AA2, where the pixel density is a number of pixels owned per inch, and the pixel is a smallest display unit and includes at least three sub-pixels capable of emitting three colors of red, green, and blue. Fig. 1 only schematically shows a display panel to which the display method provided by the present invention is applicable, where the shape of the first display area AA1 is not limited in the embodiment of the present invention, and the positional relationship between the first display area AA1 and the second display area AA2 is not limited. The first display area AA1 may be used to display information such as a notification symbol, a power symbol, a network symbol, and time; the first display area AA1 illustrated in fig. 1 may be located at an upper portion of the display panel; or the first display area AA1 may be located at one corner of the display panel; the second display area AA2 may surround the first display area AA 1; or the second display area AA2 may semi-surround the first display area AA 1. In addition, the size relationship between the area of the single first sub-pixel sp1 and the area of the single second sub-pixel sp2 is not limited in the present invention, and the area of the single first sub-pixel sp1 and the area of the single second sub-pixel sp2 may be the same or different. Optionally, the display panel is an organic light emitting display panel, and the sub-pixels in the display panel include an anode, a light emitting layer, and a cathode stacked in sequence.
Fig. 2 is a flowchart of a display method according to an embodiment of the present invention, and as shown in fig. 2, the display method includes:
step S101: when the display panel displays, the working current density of the first sub-pixel sp1 is greater than that of the second sub-pixel sp 2; in the display panel applied by the display method provided by the embodiment of the invention, the density of the first sub-pixel sp1 in the first display area AA1 is less than the density of the second sub-pixel sp2 in the second display area AA2, that is, the pixel density of the first display area AA1 is less than the pixel density of the second display area AA2, and when the operating current density of the first sub-pixel sp1 is the same as the operating current density of the second sub-pixel sp2, the luminance of the first display area AA1 is less than the luminance of the second display area AA2, so that a luminance difference visually exists. Wherein, the brightness refers to the luminous intensity per unit of projection area, and the unit is candela/square meter. Luminance is a physical quantity representing the intensity of light emission of a light-emitting body, and the luminance of one light-emitting body is the light emission intensity on the surface of the light-emitting body divided by the area on the surface of the light-emitting body. In the embodiment of the invention, the brightness of the first display area is the luminous intensity of the first display area divided by the area of the first display area; the brightness of the second display area is the luminous intensity of the second display area divided by the area of the second display area.
In the display method provided by the embodiment of the invention, when the display panel displays, the operating current density of the first sub-pixel sp1 is greater than the operating current density of the second sub-pixel sp2, so that when the same gray scale is displayed, the luminance of the single first sub-pixel sp1 is greater than the luminance of the single second sub-pixel sp2, and after the luminance of the single first sub-pixel sp1 is increased, the problem of luminance reduction of the first display area AA1 caused by density reduction of the first sub-pixel sp1 can be compensated, that is, the luminance of the first display area AA1 can be increased, so that the luminance of the first display area AA1 is substantially the same as the luminance of the second display area AA 2. That is, within a period of time when the display panel starts to be used, the display brightness uniformity of the display panel is good, and the visual effect of a user is good.
Step S102: after the display panel displays for a period of time, the operating current density of the plurality of first sub-pixels sp1 is corrected, and the brightness of the first display area AA1 is controlled to be the same as the brightness of the second display area AA 2.
When the display panel is used at the beginning, the working current density of the first sub-pixel sp1 is greater than that of the second sub-pixel sp2, so that the brightness of the display area is uniform. Due to the different operating current densities of the first sub-pixel sp1 and the second sub-pixel sp2, the lifetime attenuation degrees of the first sub-pixel sp1 and the second sub-pixel sp2 are different. The larger the operating current density is, the faster the lifetime decay is, and after the display panel displays for a period of time, the lifetime decay of the first sub-pixel sp1 is more severe than that of the second sub-pixel sp2, and the light emitting efficiency of the first sub-pixel sp1 is obviously reduced. The luminance of the sub-pixel is the luminous efficiency of the sub-pixel and the working current density of the sub-pixel, and the luminance of the first sub-pixel is reduced after the luminous efficiency of the first sub-pixel is reduced. In the embodiment of the invention, after the display panel displays for a period of time, the working current density of the plurality of first sub-pixels sp1 is corrected, and the brightness of the first display area AA1 is controlled to be the same as the brightness of the second display area AA2, that is, after the correction, the plurality of first sub-pixels sp1 operate under the corrected working current density, so that the brightness of the first display area AA1 is the same as the brightness of the second display area AA2, and thus the brightness uniformity of the whole display area is ensured. It should be noted that the brightness equal in the embodiment of the present invention means that the brightness is substantially the same, but the brightness value is not absolutely the same, and the difference between the brightness of the first display area AA1 and the brightness of the second display area AA2 may be within a threshold range. The brightness is substantially the same within the threshold range, that is, the brightness of the first display area AA1 is not different from the brightness of the second display area AA2 visually.
The display method of the display panel provided by the embodiment of the invention is applied to the display panel with the display areas having different pixel density areas, after the whole display panel is displayed for a period of time at the same brightness, the working current densities of a plurality of first sub-pixels in the first display area with smaller pixel density are corrected, and the plurality of first sub-pixels work under the corrected working current densities, so that the brightness of the first display area is approximately the same as the brightness of the second display area. Through correcting the working current density of the first sub-pixel, the brightness of the first display area is compensated, the brightness difference between the first display area and the second display area after long-time use is improved, the display area of the display panel is prevented from being divided into screens, and the display effect is improved.
In one embodiment, the step S102, after the display panel displays for a period of time, corrects the operating current density of the first sub-pixels sp1, and includes the step S1021: and presetting a display time length threshold, and correcting the working current density of the plurality of first sub-pixels sp1 when the total display time length of the display panel reaches the display time length threshold. Optionally, a plurality of display duration thresholds may be set, and when the total display duration of the display panel reaches the first display duration threshold, the working current densities of the plurality of first sub-pixels are corrected for the first time; when the total display duration of the display panel reaches a second display duration threshold value, performing second correction on the working current densities of the plurality of first sub-pixels; when the total display duration of the display panel reaches a third display duration threshold value, performing third correction on the working current densities of the first sub-pixels; and so on, wherein the first display duration threshold < the second display duration threshold < the third display duration threshold. In the embodiment, by setting the display duration threshold, when the total duration of the display panel reaches the corresponding display duration threshold, the working current densities of the plurality of first sub-pixels are automatically corrected, so that when the plurality of first sub-pixels work at the corrected working current densities, the brightness of the first display area is approximately the same as the brightness of the second display area. According to the embodiment, the length threshold value of the display time can be set, along with the accumulation of the display time of the display panel, the automatic multiple brightness correction of the first display area of the display panel is realized, the display area is prevented from being divided into screens, the brightness difference of the first display area and the second display area of the display panel is guaranteed to be not easily recognized by human eyes along with the extension of the service time, and the user experience is improved.
In one embodiment, the presetting a display duration threshold value, and when the total display duration of the display panel reaches the display duration threshold value, correcting the working current density of the first sub-pixels comprises: and presetting a display duration threshold, and correcting the working current density of the plurality of first sub-pixels by correcting the positive power supply signal for driving the plurality of first sub-pixels. Specifically, as shown in fig. 3, fig. 3 is a flowchart of an alternative implementation of a display method provided in an embodiment of the present invention, where the display method includes:
step S201: presetting a first preset relation, wherein the first preset relation is a corresponding relation between a display duration threshold value and a positive power supply signal calculation value; optionally, the first preset relationship includes multiple groups of corresponding relationships, and the display duration threshold corresponds to the positive power signal calculation value one to one. Such as: the threshold value display duration threshold value is 100h, and the corresponding positive power supply signal calculation value is V1; the threshold display duration threshold is 500h, and the corresponding positive power supply signal calculation value is V2. In an actual product, the luminous efficiency attenuation condition of the first sub-pixel compared with the second sub-pixel after long-time luminescence can be analyzed according to a plurality of tests, and then the positive power supply signal calculation value corresponding to the display duration threshold value is correspondingly set. When the first preset relationship comprises a plurality of corresponding relationships, the working current densities of a plurality of first sub-pixels of the display panel can be corrected for a plurality of times.
Step S202: recording the total display time of the display panel; the total display time of the display panel is the accumulated display time after the display panel starts to be used. After the display panel is used for a period of time, after the working current densities of the first sub-pixels are corrected, the first sub-pixels of the display panel continue to work for a period of time under the corrected working current densities, and during the period, the luminance of the first display area and the luminance of the second display area are different again due to the fact that the luminous efficiency of the first sub-pixels continues to be attenuated, the display method provided by the embodiment of the invention can correct the working current densities of the first sub-pixels again according to the first preset relation. When the correction is carried out again, the total duration of the display panel is still the accumulated display time after the display panel starts to be used, and is not calculated from the time point after the last correction and accumulated to the display time of the current correction time point.
Step S203: when the total display duration of the display panel reaches a display duration threshold, selecting a corresponding positive power supply signal calculation value as a correction positive power supply signal in a first preset relation; optionally, the first preset relationship includes multiple sets of corresponding relationships, such as: a first display duration threshold value corresponding to a first positive power signal calculated value, a second display duration threshold value corresponding to a second positive power signal calculated value, a third display duration threshold value corresponding to a third positive power signal calculated value, and so on, wherein the first display duration threshold value < the second display duration threshold value < the third display duration threshold value. When the total display duration of the display panel reaches a first display duration threshold, selecting a first positive power supply signal calculation value as a correction positive power supply signal; and when the total display time of the display panel reaches a second display time threshold, selecting a second positive power supply signal calculation value as a correction positive power supply signal, and so on.
Step S204: and controlling the plurality of first sub-pixels to emit light under the driving of the corrected positive power supply signal. That is, after the corresponding positive power source signal calculated value is selected as the corrected positive power source signal in the first preset relationship through the above steps S201 to S203, and then, when the display panel displays, the plurality of first sub-pixels are controlled to emit light under the driving of the corrected positive power source signal, so that the positive power source signal driving the plurality of first sub-pixels is automatically corrected after the display panel displays for a period of time, and the working current density of the plurality of first sub-pixels is corrected by correcting the positive power source signal driving the plurality of first sub-pixels, thereby compensating for the brightness reduction of the first display area caused by the luminous efficiency attenuation of the first sub-pixels, and ensuring that the brightness of the first display area is still substantially the same as the brightness of the second display area after the display panel displays for a period of time.
The display panel includes a plurality of pixel circuits, and the sub-pixels are electrically connected to the pixel circuits, that is, the pixel circuits are used for driving the sub-pixels to emit light. Fig. 4 is a schematic diagram of a pixel circuit in a display panel to which the display method provided by the embodiment of the invention is applicable. Fig. 5 is a timing diagram of the pixel circuit illustrated in fig. 4. As shown in fig. 4, taking only the pixel circuit including 7 transistors (T1 to T7) and 1 capacitor C as an example, the pixel circuit includes a first Scan signal terminal Scan1, a second Scan signal terminal Scan2, a data signal terminal D, a positive electrode power terminal PVDD, a negative electrode power terminal PVEE, a reset signal terminal Ref, and a light emission signal terminal Emit, and a first node N1, a second node N2, a third node N3, and a fourth node N4. Referring to the timing diagram shown in fig. 5, the operation phases of the pixel circuit can be divided into: an initialization phase t1, a data writing phase t2 and a pixel light emission phase t 3. At initialization stage t 1: the first Scan signal terminal Scan1 receives an active level signal, the reset signal received from the reset signal terminal Ref initializes the first node N1, and the reset signal resets the fourth node N4. At the data writing stage t 2: at this stage, the transistor T4 supplies the signal of the third node N3 to the first node N1 under the control of the active level signal, so that the threshold compensation of the driving transistor T7 is realized. In the pixel lighting period t 3: the emission signal end Emit inputs an effective level signal to control the transistor T5 to be turned on, an anode power supply signal input by an anode power supply end PVDD is provided to the second node N2, the driving transistor T7 maintains a certain on-state for a certain time until being turned off, at this stage, the second node N2 provides a voltage signal to the third node N3, the transistor T6 is in an on-state, and a signal of the third node N3 is provided to the fourth node N4, so that the light-emitting device emits light after the anode of the light-emitting device is charged by the fourth node N4 to reach a lighting voltage. Wherein one sub-pixel corresponds to one light emitting device.
From the above-described schematic operating principle of the pixel circuit, the formula for calculating the operating current of the sub-pixel, I ═ K (V), can be obtainedpvdd-VD)2Where I denotes the operating current of the sub-pixel, K is a constant associated with the transistor in the pixel current, VpvddA positive power supply signal V input to the positive power supply terminalDThe data signal is input to the data signal terminal. The operating current density of the sub-pixel is the operating current divided by the area of the sub-pixel (i.e. the light-emitting area of the sub-pixel). The calculation method of the sub-pixel working current and the working current density is applicable to the first sub-pixel and the second sub-pixel in the embodiment of the invention.
In the display method corresponding to fig. 3 of the present invention, after the display panel displays for a period of time, the positive power signal for controlling the plurality of first sub-pixels is corrected, and the positive power signal and the working current of the first sub-pixels have a correlation, so that the working current density of the plurality of first sub-pixels can be corrected, and further, when the plurality of first sub-pixels are driven by the corrected positive power signal to emit light, the luminance of the first display area is substantially the same as the luminance of the second display area, and it is ensured that the split screen phenomenon does not occur after the display panel displays for a period of time.
Further, in an embodiment, fig. 6 is a flowchart of another alternative implementation of the display method according to the embodiment of the present invention, and as shown in fig. 6, the display method includes:
step S301: calculating the luminous efficiency difference of the first sub-pixel and the second sub-pixel under the display duration threshold according to the luminous efficiency-time curves of the first sub-pixel and the second sub-pixel under different working current densities;
step S302: calculating a positive power supply signal calculation value corresponding to the display duration threshold value of the first display area according to the luminous efficiency difference to obtain a first preset relation, wherein the first preset relation is a corresponding relation between the display duration threshold value and the positive power supply signal calculation value; when the total display duration of the display panel reaches the display duration threshold, the plurality of first sub-pixels are controlled to emit light under the driving of the positive power supply signal calculation value, and the brightness of the first display area is the same as that of the second display area. Wherein, steps S301 and S302 are steps of presetting a first preset relationship.
Step S303: and recording the total display time of the display panel.
Step S304: and when the total display duration of the display panel reaches the display duration threshold, selecting a corresponding positive power supply signal calculation value as a corrected positive power supply signal in the first preset relation.
Step S305: and controlling the plurality of first sub-pixels to emit light under the driving of the corrected positive power supply signal.
In one specific application example, fig. 7 is a graph of luminous efficiency versus time for different current densities for a sub-pixel configured to emit blue light. In the experiment, the operating current density of the first sub-pixel sp1 was J1The operating current density of the second sub-pixel sp2 is J2Wherein, J1＝3J2. As shown in fig. 7, as the light emitting time is prolonged, the light emitting efficiency of the first sub-pixel sp1 is decreased significantly faster than that of the second sub-pixel sp 2. Setting 200h as a display duration threshold facilitates understanding of embodiments of the present inventionBriefly describe the calculation process of the calculated value of the positive power signal corresponding to 200h in the first preset relationship.
As shown in the luminous efficiency-time curve of fig. 7, at the time when t is 200h, since the luminous efficiency of the first sub-pixel sp1 and the second sub-pixel sp2 greatly decreases, when t is 200h, the luminous efficiency of the first sub-pixel sp1 is Eff1, and the luminous efficiency of the second sub-pixel sp2 is Eff2, where Eff1< Eff 2. According to the relationship between the luminous efficiency and the luminance of the sub-pixels: the luminance of the subpixel is the luminous efficiency and the operating current density. The light emitting efficiency of the first sub-pixel sp1 becomes significantly small, resulting in a low luminance of the first sub-pixel sp 1.
In the embodiment of the invention, the density of the first sub-pixels sp1 in the first display area is less than that of the second sub-pixels sp2 in the second display area, and in order to ensure that the brightness of the first display area is the same as that of the second display area, when the same gray scale is displayed, the brightness L of the first sub-pixels is1And the brightness L of the second sub-pixel2Have a certain relationship between them, L1＝n*L2(equation 1), where n is related to a relationship between the density of the first sub-pixels sp1 in the first display region and the density of the second sub-pixels sp2 in the second display region. Then at time t 200h, to ensure that the first display region and the second display region have the same luminance, the luminance L of the first sub-pixel sp1 is equal to the luminance L of the second sub-pixel sp1 when the same gray scale is displayed1＝Eff1*J1' (formula 2), wherein J1' is a calculated value of the operating current density of the first sub-pixel sp 1; luminance L of second sub-pixel sp22＝Eff2*J2(equation 3).
From the above equations 1, 2 and 3, the calculated operating current density J of the first sub-pixel sp1 can be obtained1And the operating current density of the second sub-pixel sp2 is J2The relationship between them is: j. the design is a square1＇＝n*J2Eff2/Eff1 (equation 4). n, J2Since Eff2 and Eff1 are known values, J can be calculated from equation 41The value of'.
And then calculating formula according to the working current density of the sub-pixel (the working current density of the sub-pixel is equal to the working current of the sub-pixel divided by the surface of the sub-pixel)Product), calculating the value J from the operating current density of the first sub-pixel sp11Capable of obtaining a working current calculation value I for the first sub-pixel sp11Taking the area of the first sub-pixel as S as an example, then I1＇＝J1' S (equation 5).
Substituting the above equation 5 into the calculation equation I ═ K (V) of the operating current of the sub-pixelpvdd-VD)2To obtainWherein, VpvddI.e. a calculated value of the positive power supply signal driving the first sub-pixel sp 1. Controlling a plurality of first sub-pixels sp1 to be V when the display panel displays 200hpvdd' is driven to emit light, the luminance of the first display region can be realized to be the same as the luminance of the second display region.
In this embodiment, a specific method of presetting the first preset relationship is given. The luminous efficiency difference of the first sub-pixel and the second sub-pixel under the same display time length is estimated by collecting luminous efficiency-time curves of the first sub-pixel and the second sub-pixel under different working current densities. And calculating according to the relationship between the luminous efficiency and the brightness and the working current density, wherein after the display is performed for the same time length, in order to ensure that the brightness of the first display area is the same as that of the second display area, the working current density of the first sub-pixel should meet the condition (namely, the calculated value of the working current density). And then, according to the relationship between the working current of the first sub-pixel and the working current density of the first sub-pixel and the calculation formula of the working current of the sub-pixel, the calculated value of the positive power supply signal for driving the first sub-pixel can be calculated, so that the corresponding relationship between the display duration and the calculated value of the positive power supply signal, namely the first preset relationship, can be obtained. In the subsequent display method, when the total display duration of the display panel reaches a certain threshold, the corresponding positive power supply signal calculation value is selected as the correction positive power supply signal, and the plurality of first sub-pixels are controlled to emit light under the drive of the correction positive power supply signal, so that the brightness of the first display area is approximately the same as the brightness of the second display area.
In one embodiment, the presetting a display duration threshold value, and when the total display duration of the display panel reaches the display duration threshold value, correcting the working current density of the first sub-pixels comprises: and presetting a display time length threshold, and correcting the working current density of the plurality of first sub-pixels by correcting the data signals for driving the plurality of first sub-pixels. Specifically, as shown in fig. 8, fig. 8 is a flowchart of another alternative implementation of the display method according to the embodiment of the present invention, where the display method includes:
step S401: presetting a second preset relation, wherein the second preset relation is a corresponding relation between a display duration threshold and a correction coefficient, and the correction coefficient is used for correcting a data signal for driving the first sub-pixel; optionally, the second preset relationship includes multiple groups of corresponding relationships, and the display duration threshold corresponds to the correction coefficient one to one. Such as: the preset display duration threshold value is 100h, and the corresponding correction coefficient is m 1; the preset display time length threshold value is 500h, and the corresponding correction coefficient is m 2. In an actual product, the luminous efficiency decay condition of the first sub-pixel after long-time light emission compared with the second sub-pixel can be analyzed according to a plurality of tests, and then the correction coefficient corresponding to the display duration threshold value is correspondingly set. When the second preset relationship comprises a plurality of corresponding relationships, the working current densities of a plurality of first sub-pixels of the display panel can be corrected for a plurality of times.
Step S402: recording the total display time of the display panel; the total display time of the display panel is the accumulated display time after the display panel starts to be used. After the display panel is used for a period of time, after the working current densities of the first sub-pixels are corrected, the first sub-pixels of the display panel continue to work for a period of time under the corrected working current densities, and during the period, the luminance of the first display area and the luminance of the second display area are different again due to the fact that the luminous efficiency of the first sub-pixels continues to be attenuated, the display method provided by the embodiment of the invention can correct the working current densities of the first sub-pixels again according to the second preset relation. When the correction is carried out again, the total duration of the display panel is still the accumulated display time after the display panel starts to be used, and is not calculated from the time point after the last correction and accumulated to the display time of the current correction time point.
Step S403: when the total display duration of the display panel reaches the display duration threshold, selecting a corresponding correction coefficient as a data signal correction coefficient in a second preset relation; optionally, the second preset relationship includes multiple sets of corresponding relationships, such as: the first display duration threshold corresponds to a first correction factor, the second display duration threshold corresponds to a second correction factor, the third display duration threshold corresponds to a third correction factor, and so on, wherein the first display duration threshold < the second display duration threshold < the third display duration threshold. When the total display duration of the display panel reaches a first display duration threshold, selecting a first correction coefficient as a data signal correction coefficient, and correcting a data signal for driving a first sub-pixel; and when the total display time length of the display panel reaches a second display time length threshold value, selecting a second correction coefficient as a data signal correction coefficient, and so on.
Step S404: and controlling the plurality of first sub-pixels to emit light under the driving of the data signals corrected by the data signal correction coefficients. That is, after selecting the corresponding correction coefficient from the second preset relationship through the above steps S401 to S403 as the data signal correction coefficient, and then when displaying on the display panel, controlling the plurality of first sub-pixels to emit light under the driving of the data signal after the data signal correction coefficient is corrected, so as to realize the automatic correction of the data signal for driving the plurality of first sub-pixels after the display panel displays for a period of time, and realize the correction of the operating current density of the plurality of first sub-pixels by correcting the data signal for driving the plurality of first sub-pixels, thereby compensating for the brightness reduction of the first display area caused by the luminous efficiency attenuation of the first sub-pixels, and ensuring that the brightness of the first display area is still substantially the same as the brightness of the second display area after the display panel displays for a period of time.
From the above description of the operation principle of the pixel circuit illustrated in fig. 4, in combination with the calculation formula of the operating current of the sub-pixel, I ═ K (V)pvdd-VD)2In the display method corresponding to fig. 8 of the present invention, after the display panel displays for a period of time, the data signal for controlling the plurality of first sub-pixels is corrected, the data signal and the working current of the first sub-pixels have a correlation, and the working current of the first sub-pixels and the working current density of the first sub-pixels have a relationship, so that the working current densities of the plurality of first sub-pixels can be corrected, and further, it is ensured that the luminance of the first display area is substantially the same as the luminance of the second display area when the plurality of first sub-pixels emit light under the driving of the corrected data signal, and it is ensured that the screen split phenomenon does not occur after the display panel displays for a period of time.
Further, in an embodiment, fig. 9 is a flowchart of another alternative implementation of a display method according to an embodiment of the present invention, and as shown in fig. 9, the display method includes:
step S501: calculating the luminous efficiency difference of the first sub-pixel and the second sub-pixel under the display duration threshold according to the luminous efficiency-time curves of the first sub-pixel and the second sub-pixel under different working current densities;
step S502: calculating a correction coefficient corresponding to the display duration threshold of the first display area according to the luminous efficiency difference to obtain a second preset relation, wherein the second preset relation is a corresponding relation between the display duration threshold and the correction coefficient; when the plurality of first sub-pixels are controlled to emit light under the drive of the data signals after correction of the correction coefficients, the brightness of the first display area is the same as that of the second display area. Wherein, steps S501 and S502 are steps of presetting a second preset relationship.
Step S503: and recording the total display time of the display panel.
Step S504: and when the total display time of the display panel reaches the display time threshold, selecting a corresponding correction coefficient in the second preset relation as a data signal correction coefficient.
Step S505: and controlling the plurality of first sub-pixels to emit light under the driving of the data signals corrected by the data signal correction coefficients.
Also illustrated in FIG. 7The luminous efficiency-time curve of the sub-pixel which is configured to emit blue light under different current densities is used for specific application description. Setting 200h as a display duration threshold, for facilitating understanding of the embodiment of the present invention, the following briefly describes a calculation process of a correction coefficient corresponding to 200h in the second preset relationship. For a part of the calculation process, reference may be made to the above description of the calculation process of the positive power signal calculated value corresponding to 200h in the first preset relationship, which is not described herein again. The above equation 5 is also substituted into the calculation equation I ═ K (V) of the operating current of the sub-pixelpvdd-VD)2To obtainWherein, VDI.e. calculated from the data signal driving the first sub-pixel sp 1. That is, when displaying the same gray level, the first sub-pixel sp1 is controlled to calculate the value V in the data signalD' it is possible to realize that the relationship between the luminance of the first sub-pixel and the luminance of the second sub-pixel satisfies the above equation 1.
A value V is then calculated from the data signal driving the first subpixel sp1D' the original data signal V driving the first sub-pixel sp1 when displaying the same gray levelD0The relationship between the correction coefficients q is calculated, wherein,when the display panel displays corresponding to different gray scales, the data signals for driving the first sub-pixel sp1 are different. The embodiment gives the correction coefficient of the data signal, corrects the data signal for driving the first sub-pixel sp1 according to the correction coefficient to obtain the corrected data signal, and controls the plurality of first sub-pixels sp1 to emit light under the driving of the corrected data signal when the display panel displays 200h, so that the same brightness of the first display area and the second display area can be realized.
In this embodiment, a specific method of presetting the second preset relationship is given. The luminous efficiency difference of the first sub-pixel and the second sub-pixel under the same display time length is estimated by collecting luminous efficiency-time curves of the first sub-pixel and the second sub-pixel under different working current densities. And calculating the condition (namely the calculated value of the working current density) that the working current density of the first sub-pixel should meet in order to ensure that the brightness of the first display area is the same as that of the second display area after the display is performed for the same time according to the relationship between the luminous efficiency, the brightness and the working current density. And calculating a data signal calculation value for driving the first sub-pixel according to the relationship between the working current of the first sub-pixel and the working current density of the first sub-pixel and a calculation formula of the working current of the sub-pixel. And then, a correction coefficient is obtained according to the relationship between the data signal calculation value for driving the first sub-pixel and the original data signal for driving the first sub-pixel when the same gray scale is displayed, so that the corresponding relationship between the display duration and the correction coefficient, namely a second preset relationship can be obtained. In the subsequent display method, when the total display duration of the display panel reaches a certain threshold, the corresponding correction coefficient is selected as the data signal correction coefficient, and the plurality of first sub-pixels are controlled to emit light under the driving of the data signal corrected by the data signal correction coefficient, so that the brightness of the first display area is approximately the same as the brightness of the second display area.
In an embodiment, fig. 10 is a flowchart of another alternative implementation of a display method according to an embodiment of the present invention, and as shown in fig. 10, the display method includes:
step S601: when the display panel displays, the working current density of the first sub-pixel sp1 is greater than that of the second sub-pixel sp 2;
step S602: after the display panel displays a period of time and receives an instruction of displaying a monochromatic picture, controlling the display panel to display the monochromatic picture; optionally, after the display panel displays for a period of time, when the user visually senses that there is a significant difference between the luminance of the first display area and the luminance of the second display area, an instruction for displaying a monochrome picture is sent to the display panel according to an operation of the user (i.e., an instruction is sent to a display driving module of the display panel, where the display driving module is usually integrated in a driving chip of the display panel), and after receiving the instruction for displaying the monochrome picture, the display panel displays the monochrome picture. The monochrome picture refers to a pure color picture, such as a red picture, a blue picture or a green picture, that is, the first display area and the second display area are controlled to display pictures of the same color.
When the display panel displays a monochromatic picture, a user can visually see that the brightness of the first display area and the brightness of the second display area are obviously different. Optionally, at this time, the user may operate a brightness adjustment key (a virtual key displayed on the display panel, or a virtual adjustment bar displayed on the display panel) in the display area to control and adjust the brightness of the first display area, so that the brightness of the first display area is visually perceived to be the same as the brightness of the second display area. After the user operates the brightness adjusting key, corresponding instructions and instruction values are sent to the display driving module of the display panel according to the operation of the user.
Step S603: and after receiving an instruction for adjusting the positive power supply signal or the data signal and a corresponding instruction value, controlling the plurality of first sub-pixels to emit light under the driving of the instruction value, and controlling the brightness of the first display area to be the same as that of the second display area, wherein the instruction value comprises the adjusted positive power supply signal or the instruction value comprises the adjusted data signal.
This step includes two adjustment modes. In one mode, an instruction for adjusting the positive power supply signal and the adjusted positive power supply signal are sent to a display driving module of the display panel according to a user operation, the display driving module controls the plurality of sub-pixels to emit light under the driving of the adjusted positive power supply signal after receiving a corresponding instruction, and at the moment, when the display panel displays a monochrome picture, the luminance of the first display area is the same as the luminance of the second display area. In another mode, an instruction for adjusting the data signal and the adjusted data signal are sent to a display driving module of the display panel according to a user operation, and after receiving the corresponding instruction, the display driving module controls the plurality of sub-pixels to emit light under the driving of the adjusted data signal, and at this time, when the display panel displays a monochrome picture, the luminance of the first display area is the same as the luminance of the second display area.
Optionally, a plurality of positive power signals may be preset in this embodiment, and the plurality of positive power signals may be calculated values of the plurality of positive power signals obtained by using the calculation method in the embodiment description corresponding to fig. 6. In this embodiment, a plurality of positive power signal calculation values corresponding to a plurality of display durations are calculated according to a luminous efficiency-time curve, wherein the number of the plurality of display durations is as large as possible, which is convenient for a user to randomly adjust, and since different users may have differences in visual perception, or even after the user visually feels that the brightness of the first display area and the second display area is different, the brightness cannot be adjusted immediately, so that better application experience of the display method can be ensured by calculating the plurality of positive power signal calculation values corresponding to the display durations with more numbers. When an instruction for adjusting the positive power supply signal is sent to the display driving module of the display panel, one of the multiple positive power supply signal calculation values is selected as an instruction value, namely, the selected positive power supply signal is used as the adjusted positive power supply signal.
Optionally, a plurality of data signals may be preset in this embodiment, and the data signals may also be a plurality of data signal calculated values obtained by using the calculation method in the embodiment description corresponding to fig. 9, and a plurality of data signal calculated values corresponding to a plurality of display durations are calculated according to the luminous efficiency-time curve. When an instruction for adjusting the data signal is sent to the display driving module of the display panel, one of the plurality of data signal calculation values is selected as an instruction value, namely, the data signal after adjustment.
Optionally, in this embodiment, after one operation, the user may not necessarily ensure that the brightness of the first display area is adjusted to be the same as the brightness of the second display area, and when the user visually senses that the brightness of the first display area is still different from the brightness of the second display area, the user may operate the brightness adjustment key in the display area again, and the display driving module of the display panel continues to execute step S602 and step S603 until the user finishes the operation of correcting the brightness.
Step S604: recording the adjusted positive power supply signal as a corrected positive power supply signal; or recording the adjusted data signal as a correction data signal, and calculating a correction coefficient according to the correction data signal;
when a user visually perceives and displays a monochrome picture by adjusting and controlling the brightness of the first display area, the user finishes the operation of correcting the brightness when the brightness of the first display area is the same as that of the second display area, and a display driving module of the display panel takes the received anode power supply signal after the last adjustment as a corrected anode power supply signal; or the display driving module takes the received data signal after the last adjustment as a correction data signal and calculates a correction coefficient according to the correction data signal; the calculation method of the correction coefficient may be the same as the calculation method of the correction coefficient q in the above description of the embodiment of fig. 9, and is not repeated here.
Step S605: controlling the plurality of first sub-pixels to emit light under the driving of the corrected positive power supply signal; alternatively, the plurality of first sub-pixels are controlled to emit light under the driving of the data signal corrected by the correction coefficient. This embodiment enables correction of the positive power supply signal or the data signal driving the plurality of first sub-pixels, and the operating current of the sub-pixels is correlated with the positive power supply signal and the data signal according to the calculation formula of the operating current of the sub-pixels, thereby enabling correction of the operating current density of the sub-pixels.
According to the display method provided by the embodiment, after the display panel displays for a period of time, the brightness of the display panel can be corrected according to the operation of a user, the brightness of the first display area is the same as that of the second display area after correction, it is ensured that the display split phenomenon still does not occur in the first display area and the second display area after the display panel displays for a period of time, and the display effect is improved. In addition, in the embodiment, the user can correct the brightness of the display panel at any time according to the requirement of the user, and the user experience is good.
In a display panel to which the display method provided by the embodiment of the invention is applied, the plurality of first sub-pixels include a plurality of first sub-pixels configured to emit red light, a plurality of first sub-pixels configured to emit green light, and a plurality of first sub-pixels configured to emit blue light; after the display panel displays for a period of time, correcting the working current density of the plurality of first sub-pixels, comprising: at least the operating current density of the plurality of first sub-pixels configured to emit blue light is corrected. As the service time of the display panel is prolonged, the luminous efficiency of the plurality of first sub-pixels which are configured to emit light with different colors is different from each other in attenuation condition. Optionally, the light emitting efficiency of the first sub-pixel configured to emit blue light is more severely attenuated, and the influence on the brightness of the first display area is greater, and only the operating current density of the first sub-pixel configured to emit blue light may be corrected.
Optionally, in the embodiment corresponding to fig. 2 to 10, the correcting the operating current densities of the plurality of first sub-pixels includes: the operating current density of the plurality of first sub-pixels configured to emit blue light is corrected.
Optionally, in the embodiment corresponding to fig. 2 to 10, the correcting the operating current densities of the plurality of first sub-pixels includes: correcting an operating current density of a plurality of first subpixels configured to emit blue light; correcting an operating current density of the plurality of first subpixels configured to emit red light; the operating current density of the plurality of first subpixels configured to emit green light is corrected. In the display method, after the display panel displays for a period of time, the working current densities of the plurality of first sub-pixels configured to emit light of different colors are all corrected, so that color cast displayed in the first display area can be avoided, and the brightness of the corrected first display area is ensured to be the same as that of the second display area.
In an embodiment, fig. 11 is a partial schematic view of a display panel to which the display method provided in the embodiment of the present invention can be applied, and fig. 12 is a flowchart of another alternative implementation of the display method provided in the embodiment of the present invention. As shown in fig. 11, the display panel includes at least one photosensitive element group GZ including a first photosensitive element GZ1 located in the first display area AA1 and a second photosensitive element GZ2 located in the second display area AA 2; the plurality of first sub-pixels sp1 includes at least one first monitored sub-pixel sp1K, the first photosensitive element GZ1 is adjacent to the first monitored sub-pixel sp 1K; the plurality of second sub-pixels sp2 includes at least one second monitored sub-pixel sp2K, and the second photosensitive element GZ2 is adjacent to the second monitored sub-pixel sp 2K; wherein the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K are each configured to emit light of a first color. Optionally, in the embodiment of the present invention, the number of the photosensitive element groups GZ in the display panel is not limited, and fig. 11 is only illustrated by including one photosensitive element group GZ. Alternatively, the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K may be closer together. In one embodiment, the first monitored sub-pixel is adjacent to the second display region, the second monitored sub-pixel is adjacent to the first display region, and the first monitored sub-pixel and the second monitored sub-pixel are located in the same sub-pixel row or the same sub-pixel column.
As shown in fig. 12, the display method includes:
step S701: when the display panel displays, the working current density of the first sub-pixel sp1 is greater than that of the second sub-pixel sp 2;
step S702: the first photosensitive element GZ1 monitors the brightness of the first monitored sub-pixel sp1K to obtain a first brightness, and the second photosensitive element GZ2 monitors the brightness of the second monitored sub-pixel sp2K to obtain a second brightness;
step S703: when the difference between the second luminance and the first luminance is equal to or greater than the first threshold value, the operating current densities of the plurality of first sub-pixels sp1 configured to emit the first color light are corrected. The specific size of the first threshold is not limited in the embodiments of the present invention, and the selection of the first threshold is related to the area of the first sub-pixel, the area of the second sub-pixel, the pixel density of the first display area, the pixel density of the second display area, and other factors, and can be set according to specific product design requirements in practice.
In the display panel to which the display method provided in the embodiment of the invention can be applied, the density of the plurality of first sub-pixels is less than the density of the plurality of second sub-pixels, when the display panel displays, the working current density of the first sub-pixels is greater than the working current density of the second sub-pixels, when the same gray scale is displayed, the luminance of the first sub-pixels is greater than the luminance of the second sub-pixels, and the difference between the luminance of the first sub-pixels and the luminance of the second sub-pixels needs to satisfy a certain condition. After the display panel displays for a period of time, the luminous efficiency of the first sub-pixel is seriously attenuated compared with that of the second sub-pixel, and the brightness of the first sub-pixel is obviously reduced when the same gray scale is displayed. After the luminance of the first sub-pixel is obviously reduced, the luminance of the first sub-pixel may still be greater than that of the second sub-pixel, or in the case that the light-emitting efficiency of the first sub-pixel is seriously degraded, the luminance of the first sub-pixel may also be less than that of the second sub-pixel. In this embodiment, the brightness of the first sub-pixel and the brightness of the second sub-pixel emitting the same color light are detected and monitored by the photosensitive element group to obtain the first brightness and the second brightness. And when the difference value between the second brightness and the first brightness meets a certain threshold value condition, judging that the brightness of the first display area is obviously different from that of the second display area, and triggering the operation of correcting the working current density of the first sub-pixel.
Alternatively, the first color may be blue, i.e., both the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K are configured to emit blue color light.
In one embodiment, correcting the operating current density of a plurality of first subpixels configured to emit light of a first color comprises: correcting a positive power supply signal that drives a plurality of first sub-pixels configured to emit light of a first color; alternatively, the data signals driving the plurality of first sub-pixels configured to emit the first color light are corrected. This embodiment enables correction of the positive power supply signal or correction of the data signal driving a plurality of sub-pixels configured to emit the first color light, the operating current of the sub-pixels being related to the positive power supply signal and the data signal according to a calculation formula of the operating current of the sub-pixels, thereby enabling correction of the operating current density of the sub-pixels configured to emit the first color light.
Optionally, in this embodiment, a simulation test may be adopted, and a plurality of positive power signals corresponding to the difference value are preset according to the difference value between the second luminance and the first luminance, where the plurality of positive power signals may be a plurality of positive power signal calculated values obtained by using the calculation method in the embodiment description corresponding to fig. 6. When the positive power supply signals for driving the plurality of first sub-pixels configured to emit the first color light need to be corrected, a corresponding one of the plurality of positive power supply signal calculation values is selected as the corrected positive power supply signal, and then the plurality of first sub-pixels configured to emit the first color light are controlled to emit light under the driving of the corrected positive power supply signal, so that the brightness of the first display area is the same as the brightness of the second display area.
The manner of presetting the corresponding positive power signal according to the difference between the second brightness and the first brightness is briefly exemplified herein. Following the example of the embodiment corresponding to FIG. 6, in order to ensure that the first display region and the second display region have the same brightness, the brightness L of the first sub-pixel is equal when the same gray scale is displayed1And the brightness L of the second sub-pixel2Have a certain relationship between them, L1＝n*L2(equation 1), that is, after the luminance correction is performed, the above equation 1 is also satisfied between the luminances of the first and second sub-pixels configured to emit the same color light. Taking the first luminance as 1L and the second luminance as 2L as an example, when the luminance of the second sub-pixel is 2L, the luminance of the first sub-pixel needs to satisfy the above formula 1, and it can be ensured that the luminance of the first display area is the same as the luminance of the second display area. The brightness L of the second sub-pixel2Is obtained by substituting 2L into formula 1, L1'n' 2L, wherein L1' is a luminance calculation value of the first sub-pixel. And calculating the calculated value of the positive power supply signal of the first sub-pixel configured to emit the first color light according to the relationship between the luminous efficiency and the brightness and the working current density and the calculation formula of the sub-pixel working current.
By using the same calculation principle, referring to the calculation method of the data signal calculation value and the calculation method of the correction coefficient in the above embodiment, the corresponding data signal can also be preset according to the difference between the second brightness and the first brightness, which is not described herein again.
Based on the same inventive concept, an embodiment of the present invention further provides a display panel, and fig. 13 is a schematic diagram of an alternative implementation manner of the display panel provided in the embodiment of the present invention. As shown in fig. 13, the display area AA of the display panel includes a first display area AA1 and a second display area AA2, the display area AA includes a plurality of sub-pixels sp including a plurality of first sub-pixels sp1 and a plurality of second sub-pixels sp2, the plurality of first sub-pixels sp1 are located in the first display area AA1, the plurality of second sub-pixels sp2 are located in the second display area AA2, a density of the plurality of first sub-pixels sp1 is smaller than a density of the plurality of second sub-pixels sp2, that is, a pixel density of the first display area AA1 is smaller than a pixel density of the second display area AA2, where the pixel density is the number of pixels owned per inch, and the pixel is a smallest display unit and includes at least three sub-pixels capable of emitting three colors of red, green, and blue. Fig. 1 only schematically shows a display panel to which the display method provided by the present invention is applicable, where the shape of the first display area AA1 is not limited in the embodiment of the present invention, and the positional relationship between the first display area AA1 and the second display area AA2 is not limited. The display panel further includes a luminance correcting module 11, and the luminance correcting module 11 is configured to correct the operating current density of the plurality of first sub-pixels sp1 after the display panel displays for a period of time, and control the luminance of the first display area AA1 to be the same as the luminance of the second display area AA 2. Optionally, the display panel includes a driver chip IC, and the brightness correction module 11 is a program written in the driver chip IC, and optionally, the driver chip IC is fixed on a flexible circuit board, and the flexible circuit board is bound and connected with the display panel (not shown in the figure). The display panel provided in this embodiment can display by applying the display method corresponding to the embodiment in fig. 2, and the brightness correction module 11 can execute the step S102. The brightness correction module 11 can correct the working current density of the plurality of first sub-pixels sp1 after the display panel displays for a period of time, and control the brightness of the first display area AA1 to be the same as the brightness of the second display area AA2, that is, after the correction, the plurality of first sub-pixels sp1 operate at the corrected working current density, so that the brightness of the first display area AA1 is the same as the brightness of the second display area AA2, and the compensation of the brightness of the first display area is realized by correcting the working current density of the first sub-pixels, so that the brightness difference between the first display area and the second display area after long-time use is improved, the display area of the display panel is prevented from being split and the display effect is improved.
In an embodiment, fig. 14 is a schematic view of another alternative implementation of the display panel according to the embodiment of the present disclosure. As shown in fig. 14, the display panel includes a positive power line XP, the positive power line XP includes a first positive power line XP1 and a second positive power line XP2, and the first positive power line XP1 and the second positive power line XP2 are not electrically connected to each other; the plurality of second sub-pixels sp2 are electrically connected to a second positive power line XP 2; the plurality of first subpixels sp1 includes a plurality of first subpixels sp1R configured to emit red light, a plurality of first subpixels sp1G configured to emit green light, and a plurality of first subpixels sp1B configured to emit blue light, and each of the plurality of first subpixels sp1B configured to emit blue light is electrically connected to the first positive power supply line XP 1. Alternatively, in this embodiment, the first sub-pixel sp1R configured to emit red light and the first sub-pixel sp1G configured to emit green light may both be electrically connected to the second positive power supply line XP 2. The plurality of second subpixels sp2 in the second display area AA2 include a plurality of second subpixels configured to emit red light, a plurality of second subpixels configured to emit green light, and a plurality of second subpixels (not shown in the drawings) configured to emit blue light. In the display panel provided in this embodiment, the first sub-pixel sp1B configured to emit blue light is electrically connected to the first positive power supply line XP1, the plurality of second sub-pixels sp2 are electrically connected to the second positive power supply line XP2, and the first positive power supply line XP1 and the second positive power supply line XP2 may be respectively connected to the driving chip IC. In this embodiment, the luminance correction module 11 may correct the operating current density of the first sub-pixel sp1B configured to emit blue light by correcting the positive power supply signal driving the first sub-pixel sp1B configured to emit blue light. The display panel provided by this embodiment can execute the display method provided by any one of the above display embodiment embodiments, thereby ensuring that after the display panel displays for a period of time, the luminance of the first display area and the luminance of the second display area are still the same, and avoiding the display area of the display panel being divided into screens.
In an embodiment, fig. 15 is a schematic view of another alternative implementation of the display panel according to the embodiment of the present disclosure. As shown in fig. 15, the positive power line XP further includes a third positive power line XP3 and a fourth positive power line XP4, the first positive power line XP1, the second positive power line XP2, the third positive power line XP3 and the fourth positive power line XP4 are all not electrically connected to each other in pairs; wherein the plurality of first sub-pixels sp1R configured to emit red light are electrically connected to the third positive power line XP3, and the plurality of first sub-pixels sp1G configured to emit green light are electrically connected to the fourth positive power line XP 4. The first sub-pixel sp1R configured to emit red light, the first sub-pixel sp1G configured to emit green light, and the first sub-pixel sp1B configured to emit blue light in the first display region in this embodiment are all driven by the respective positive power supply lines, the display panel provided by this embodiment can perform the display method provided by the above-mentioned display method embodiment, the luminance correction module 11 can respectively correct the positive power supply signal for driving the first sub-pixel sp1G configured to emit green light, the positive power supply signal for driving the first sub-pixel sp1R configured to emit red light, and the positive power supply signal for driving the first sub-pixel sp1B configured to emit blue light, and after the display panel displays for a period of time, the working current densities of the plurality of first sub-pixels configured to emit light of different colors are all corrected, so that color cast displayed in the first display area can be avoided, and the brightness of the corrected first display area is ensured to be the same as that of the second display area. The method for correcting the positive power signal of the first sub-pixel may refer to the description in the foregoing display method embodiment, and is not repeated herein.
Optionally, in the display panel provided in the embodiments of fig. 14 and 15, the luminance correcting module 11 may also correct the operating current density of the first sub-pixel sp1B configured to emit blue light by correcting a data signal for driving the first sub-pixel sp1B configured to emit blue light. Or correcting the data signal driving the first sub-pixel sp1R configured to emit red light, thereby achieving correction of the operating current density of the first sub-pixel sp1R configured to emit red light. The data signal driving the first sub-pixel sp1G configured to emit green light is corrected to achieve a correction of the operating current density of the first sub-pixel sp1G configured to emit green light. The method for correcting the data signal of the first sub-pixel may refer to the description in the foregoing display method embodiment, and is not repeated herein.
In one embodiment, fig. 16 is a block diagram of an alternative implementation of a display panel according to an embodiment of the present invention. As shown in fig. 16, the display panel further includes a clock module 21 and a comparison module 22, the clock module 21 is electrically connected to the comparison module 22, and the clock module 21 is configured to record the total display duration of the display panel and send the total display duration of the display panel to the comparison module 22; the comparison module 22 is electrically connected to the brightness correction module 11, and the comparison module 22 is configured to compare the received total display duration of the display panel with a display duration threshold, and send a correction instruction to the brightness correction module 11 when the total display duration of the display panel reaches the display duration threshold; the brightness correction module 11 is further configured to correct the operating current densities of the plurality of first sub-pixels after receiving the correction instruction. The display panel provided by the embodiment can execute the step S1021 in the display method embodiment, so that multiple times of brightness correction of the first display area of the display panel can be automatically performed along with the accumulation of the display time of the display panel by setting a plurality of display time threshold values, thereby avoiding the display area division, ensuring that the brightness difference between the first display area and the second display area of the display panel is still not easily recognized by human eyes along with the extension of the service time, and improving the user experience.
In one embodiment, fig. 17 is a block diagram of another alternative implementation of a display panel according to an embodiment of the present invention. As shown in fig. 17, the brightness correction module 11 includes a power signal corrector sub-module 112, where the power signal corrector sub-module 112 is configured to select a corresponding positive power signal calculated value as a corrected positive power signal in a first preset relationship after receiving a correction instruction, where the first preset relationship is a corresponding relationship between a display duration threshold and the positive power signal calculated value, when a total display duration of the display panel reaches the display duration threshold, the plurality of first sub-pixels are controlled to emit light under the driving of the positive power signal calculated value, and the brightness of the first display area is the same as the brightness of the second display area; the display panel further includes a display driving module 33, and the display driving module 33 is electrically connected to the luminance correcting module 11 and configured to control the plurality of first sub-pixels to emit light under the driving of the corrected positive power signal. The display panel provided by this embodiment can perform the display method in steps S201 to S204, and can automatically correct the positive power signal for driving the plurality of first sub-pixels after the display panel displays for a period of time, and correct the operating current density of the plurality of first sub-pixels by correcting the positive power signal for driving the plurality of first sub-pixels, so as to compensate for the decrease in luminance of the first display area caused by the attenuation of the luminous efficiency of the first sub-pixels, and ensure that the luminance of the first display area is still substantially the same as the luminance of the second display area after the display panel displays for a period of time. For the correction principle and method of the positive power signal, reference may be made to the corresponding descriptions in the foregoing display method embodiments, and details are not repeated here.
In one embodiment, fig. 18 is a modular block diagram of an alternative implementation of a display panel according to an embodiment of the invention. As shown in fig. 18, the brightness correction module 11 includes a data signal correction submodule 113, where the data signal correction submodule 113 is configured to select a corresponding correction coefficient as a data signal correction coefficient in a second preset relationship after receiving a correction instruction, where the second preset relationship is a corresponding relationship between a display duration threshold and the correction coefficient, and when a total display duration of the display panel reaches the display duration threshold, the brightness of the first display area is the same as the brightness of the second display area when the plurality of first subpixels are controlled to emit light under driving of the data signal after correction by the correction coefficient; the display panel further includes a display driving module 33, and the display driving module 33 is electrically connected to the luminance correcting module 11 and configured to control the plurality of first sub-pixels to emit light under the driving of the data signals corrected by the data signal correction coefficients. The display panel provided by this embodiment can perform the display method in steps S401 to S404, and can automatically correct the data signals for driving the plurality of first sub-pixels after the display panel displays for a period of time, and correct the operating current densities of the plurality of first sub-pixels by correcting the data signals for driving the plurality of first sub-pixels, so as to compensate for the decrease in luminance of the first display area caused by the decrease in luminous efficiency of the first sub-pixels, and ensure that the luminance of the first display area is still substantially the same as the luminance of the second display area after the display panel displays for a period of time. For the principle and method of correcting the data signal, reference may be made to the corresponding descriptions in the foregoing display method embodiments, which are not described herein again.
In one embodiment, fig. 19 is a block diagram of another alternative implementation of a display panel according to an embodiment of the present invention. As shown in fig. 19, the display panel further includes a display driving module 33, and the display driving module 33 is electrically connected to the luminance correcting module 11; wherein,
the display driving module 33 is configured to control the display panel to display a monochrome picture after receiving an instruction to display the monochrome picture; optionally, after the display panel displays for a period of time, when the user visually senses that there is a significant difference between the luminance of the first display area and the luminance of the second display area, an instruction for displaying a monochrome picture is sent to the display driving module of the display panel according to an operation of the user, and the display panel displays the monochrome picture after receiving the instruction for displaying the monochrome picture.
The brightness correction module 11 is configured to generate a first control instruction after receiving an instruction for adjusting the positive power signal or the data signal and a corresponding instruction value, where the instruction value includes the adjusted positive power signal or the instruction value includes the adjusted data signal;
the display driving module 33 is further configured to control the plurality of first sub-pixels to emit light under the driving of the instruction value after receiving the first control instruction, and control the luminance of the first display area to be the same as the luminance of the second display area;
the brightness correction module 11 is further configured to record the adjusted positive power signal as a corrected positive power signal, or record the adjusted data signal as a corrected data signal, and calculate a correction coefficient according to the corrected data signal;
the display driving module 33 is further configured to control the plurality of first sub-pixels to emit light under the driving of the corrected positive power signal; alternatively, the plurality of first sub-pixels are controlled to emit light under the driving of the data signal corrected by the correction coefficient.
The display panel provided in this embodiment can perform the display methods of step S601 to step S605, and the principle of the display method is the same as that of the above embodiment, and is not described again here. According to the embodiment, the brightness of the display panel can be corrected according to the operation of a user after the display panel displays for a period of time, the brightness of the first display area is the same as that of the second display area after correction, the display split screen phenomenon can still not occur in the first display area and the second display area after the display panel displays for a period of time, and the display effect is improved. In addition, in the embodiment, the user can correct the brightness of the display panel at any time according to the requirement of the user, and the user experience is good.
In an embodiment, fig. 20 is a schematic diagram of another alternative implementation of the display panel according to the embodiment of the present invention. As shown in fig. 20, the display panel includes at least one photosensitive element group GZ including a first photosensitive element GZ1 located in the first display area AA1 and a second photosensitive element GZ2 located in the second display area AA 2; the plurality of first sub-pixels sp1 includes at least one first monitored sub-pixel sp1K, the first photosensitive element GZ1 is adjacent to the first monitored sub-pixel sp 1K; the plurality of second sub-pixels sp2 includes at least one second monitored sub-pixel sp2K, and the second photosensitive element GZ2 is adjacent to the second monitored sub-pixel sp 2K; wherein the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K are each configured to emit light of a first color. Alternatively, the first color may be blue, i.e., both the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K are configured to emit blue color light.
Optionally, in the embodiment of the present invention, the number of the photosensitive element groups GZ in the display panel is not limited, and fig. 20 is only illustrated by including one photosensitive element group GZ.
As shown in fig. 20, the display panel further includes a brightness monitoring module 40, wherein the brightness monitoring module 40 is electrically connected to the brightness correction module 11;
the luminance monitoring module 40 includes: the monitoring device comprises a first monitoring submodule 401, a second monitoring submodule 402 and a brightness comparison submodule 403, wherein the first monitoring submodule 401 is electrically connected with a first photosensitive element GZ1, and the first monitoring submodule 401 is used for controlling the first photosensitive element GZ1 to monitor the brightness of a first monitored sub-pixel sp1K to obtain first brightness; the second monitoring submodule 402 is electrically connected to the second photosensitive element GZ2, and the second monitoring submodule 402 is configured to control the second photosensitive element GZ2 to monitor the brightness of the second monitored sub-pixel sp2K to obtain a second brightness; a brightness comparison sub-module 403, configured to compare the first brightness with the second brightness, and send a correction instruction to the brightness correction module 11 when a difference between the second brightness and the first brightness is greater than or equal to a first threshold;
the luminance correction module 11 is configured to correct the operating current densities of the plurality of first sub-pixels configured to emit the first color light after receiving the correction instruction.
The display panel provided in this embodiment can execute the display method described in steps S701 to S703, and the principle of the display method is the same as that in the above embodiment, and is not described again here. And detecting and monitoring the brightness of the first sub-pixel and the brightness of the second sub-pixel which emit the same color light through the photosensitive element group to obtain first brightness and second brightness. And when the difference value between the second brightness and the first brightness meets a certain threshold value condition, judging that the brightness of the first display area is obviously different from that of the second display area, and triggering the operation of correcting the working current density of the first sub-pixel.
Alternatively, continuing to refer to fig. 20, in the display area of the display panel: the plurality of sub-pixels sp are arranged in sub-pixel rows spH along a first direction a, the plurality of sub-pixels sp are arranged in sub-pixel columns spL along a second direction b, and the first direction a and the second direction b intersect; the first monitored sub-pixel sp1K is adjacent to the second display area AA2, the second monitored sub-pixel sp2K is adjacent to the first display area AA1, and the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K are located in the same sub-pixel column spL. If the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K are far apart from each other, in one frame of image display, since different pixel regions in the display image may have different requirements for the display luminance of the sub-pixels, the luminance of the first monitored sub-pixel sp1K and the luminance of the second monitored sub-pixel sp2K have a large difference, and when the luminance comparison sub-module 403 compares the first luminance and the second luminance, complicated conversion is required, that is, conversion into the luminance difference when displaying the same gray scale is performed, which increases the complexity of the operation processing of the luminance monitoring module 40. In this embodiment, the distance between the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K is relatively short, in one frame of screen display, the screen positions displayed by the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K are very close, the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K display the same gray scale, and when the brightness comparison sub-module 403 compares the first brightness and the second brightness, no complicated conversion is required, so that the operation process of the brightness monitoring module 40 can be simplified.
In another alternative embodiment, the first monitored sub-pixel sp1K and the second monitored sub-pixel sp2K may also be located in the same sub-pixel row, and are not described herein again.
Optionally, in the display panel provided in the embodiment of the present invention, the brightness correction module includes a power signal correction sub-module, and the power signal correction sub-module is configured to correct an anode power signal for driving a plurality of first sub-pixels configured to emit light of the first color. Alternatively, the luminance correction module includes a data signal correction sub-module for correcting a data signal for driving a plurality of first sub-pixels configured to emit the first color light. This embodiment enables correction of the positive power supply signal or correction of the data signal driving a plurality of sub-pixels configured to emit the first color light, the operating current of the sub-pixels being related to the positive power supply signal and the data signal according to a calculation formula of the operating current of the sub-pixels, thereby enabling correction of the operating current density of the sub-pixels configured to emit the first color light.
Optionally, in this embodiment, a simulation test may be adopted, and a plurality of positive power signals corresponding to the difference value are preset according to the difference value between the second luminance and the first luminance, where the plurality of positive power signals may be a plurality of positive power signal calculated values obtained by using the calculation method in the embodiment description corresponding to fig. 6. When the positive power supply signals for driving the plurality of first sub-pixels configured to emit the first color light need to be corrected, a corresponding one of the plurality of positive power supply signal calculation values is selected as the corrected positive power supply signal, and then the plurality of first sub-pixels configured to emit the first color light are controlled to emit light under the driving of the corrected positive power supply signal, so that the brightness of the first display area is the same as the brightness of the second display area. The manner of presetting the corresponding positive power signal according to the difference between the second brightness and the first brightness can refer to the description in the above embodiment of the display method, and is not repeated here.
In addition, by using the same calculation principle, referring to the calculation manner of the data signal calculation value and the calculation manner of the correction coefficient in the above embodiment, the corresponding data signal can also be preset according to the difference between the second luminance and the first luminance, which is not described herein again.
Based on the same inventive concept, the present invention further provides a display device, fig. 21 is a schematic view of the display device provided in the embodiment of the present invention, and as shown in fig. 21, the display device includes any one of the display panels 100 provided in the embodiment of the present invention. The specific structure of the display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 21 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
Based on the same inventive concept, the present invention further provides a brightness correction method for a display panel, where the display area of the display panel includes a first display area and a second display area, the display area includes a plurality of sub-pixels, the plurality of sub-pixels includes a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first sub-pixels are located in the first display area, the plurality of second sub-pixels are located in the second display area, a density of the plurality of first sub-pixels is less than a density of the plurality of second sub-pixels, when the display panel displays, a working current density of the first sub-pixels is greater than a working current density of the second sub-pixels, the display panel further includes a display driving module and a brightness correction module, fig. 22 is a flowchart of the brightness correction method provided in the embodiment of the present invention, and as shown in fig. 22, the brightness correction method includes:
step S801, sending a command for displaying a monochromatic picture to a display driving module, and controlling a display panel to display the monochromatic picture; optionally, after the display panel displays for a period of time, when the user visually senses that there is a significant difference between the luminance of the first display area and the luminance of the second display area, an instruction for displaying a monochrome picture is sent to the display driving module of the display panel according to an operation of the user, and after receiving the instruction for displaying the monochrome picture, the display driving module of the display panel controls the display panel to display the monochrome picture.
When the display panel displays a monochromatic picture, a user can visually see that the brightness of the first display area and the brightness of the second display area are obviously different. Optionally, at this time, the user may operate a brightness adjustment key in the display area to control and adjust the brightness of the first display area, so that the brightness of the first display area is visually perceived to be the same as the brightness of the second display area. After the user operates the brightness adjusting key, corresponding instructions and instruction values are sent to the display driving module of the display panel according to the operation of the user.
Optionally, in this embodiment, after one operation, the user may not necessarily ensure that the brightness of the first display area is adjusted to be the same as the brightness of the second display area, and when the user visually senses that the brightness of the first display area is still different from the brightness of the second display area, the user may operate the brightness adjustment key in the display area again, and continue to execute step S801 until the user finishes the operation of correcting the brightness.
And S802, sending an instruction for adjusting the positive power supply signal or the data signal and a corresponding instruction value to the brightness correction module according to the operation of a user, and controlling the brightness of the first display area to be the same as that of the second display area, wherein the instruction value comprises the adjusted positive power supply signal or the instruction value comprises the adjusted data signal.
The brightness correction method provided by this embodiment includes two brightness correction modes. In one mode, an instruction for adjusting the positive power supply signal and the adjusted positive power supply signal are sent to a display driving module of the display panel according to a user operation, the display driving module controls the plurality of sub-pixels to emit light under the driving of the adjusted positive power supply signal after receiving a corresponding instruction, and at the moment, when the display panel displays a monochrome picture, the luminance of the first display area is the same as the luminance of the second display area. In another mode, an instruction for adjusting the data signal and the adjusted data signal are sent to a display driving module of the display panel according to a user operation, and after receiving the corresponding instruction, the display driving module controls the plurality of sub-pixels to emit light under the driving of the adjusted data signal, and at this time, when the display panel displays a monochrome picture, the luminance of the first display area is the same as the luminance of the second display area.
According to the brightness correction method provided by the embodiment, after the display panel displays for a period of time, the brightness of the display panel can be corrected according to the operation of a user, the brightness of the first display area is the same as that of the second display area after correction, it is ensured that the display split phenomenon still does not occur in the first display area and the second display area after the display panel displays for a period of time, and the display effect is improved. In addition, the user can correct the brightness of the display panel at any time according to the requirement of the user, and the user experience is good. In addition, the principle adopted by the brightness correction method in this embodiment may refer to the corresponding description of the display method embodiment, and is not described herein again.
Based on the same inventive concept, the present invention further provides a storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the brightness correction method provided by the above embodiments.
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.

Claims (23)

1. A display method of a display panel, wherein a display area of the display panel comprises a first display area and a second display area, the display area comprises a plurality of sub-pixels, the plurality of sub-pixels comprises a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first sub-pixels are located in the first display area, the plurality of second sub-pixels are located in the second display area, and the density of the plurality of first sub-pixels is less than that of the plurality of second sub-pixels, the display method comprising:
when the display panel displays, the working current density of the first sub-pixel is larger than that of the second sub-pixel;
after the display panel displays for a period of time, correcting the working current density of the first sub-pixels, and controlling the brightness of the first display area to be the same as that of the second display area.
2. The display method according to claim 1,
after the display panel displays for a period of time, correcting the working current density of the plurality of first sub-pixels, including:
and presetting a display duration threshold, and correcting the working current densities of the first sub-pixels when the total display duration of the display panel reaches the display duration threshold.
3. The display method according to claim 2,
presetting a display duration threshold, and when the total display duration of the display panel reaches the display duration threshold, correcting the working current densities of the first sub-pixels, wherein the correcting step comprises the following steps:
presetting a first preset relation, wherein the first preset relation is a corresponding relation between the display duration threshold value and a positive power supply signal calculation value;
recording the total display time of the display panel;
when the total display duration of the display panel reaches the display duration threshold, selecting a corresponding positive power supply signal calculation value as a corrected positive power supply signal in the first preset relation;
the display method further comprises the following steps: and controlling the plurality of first sub-pixels to emit light under the driving of the corrected positive power supply signal.
4. The display method according to claim 3,
the step of presetting the first preset relationship comprises the following steps:
calculating the luminous efficiency difference of the first sub-pixel and the second sub-pixel under the display duration threshold according to the luminous efficiency-time curves of the first sub-pixel and the second sub-pixel under different working current densities;
and calculating a positive power supply signal calculation value corresponding to the display duration threshold value of the first display area according to the luminous efficiency difference, wherein when the total display duration of the display panel reaches the display duration threshold value, the first sub-pixels are controlled to emit light under the driving of the positive power supply signal calculation value, and the brightness of the first display area is the same as that of the second display area.
5. The display method according to claim 2,
presetting a display duration threshold, and when the total display duration of the display panel reaches the display duration threshold, correcting the working current densities of the first sub-pixels, wherein the correcting step comprises the following steps:
presetting a second preset relation, wherein the second preset relation is a corresponding relation between the display duration threshold and a correction coefficient, and the correction coefficient is used for correcting a data signal for driving the first sub-pixel;
recording the total display time of the display panel;
when the total display duration of the display panel reaches the display duration threshold, selecting a corresponding correction coefficient in the second preset relation as a data signal correction coefficient;
the display method further comprises the following steps: and controlling a plurality of the first sub-pixels to emit light under the driving of the data signals corrected by the data signal correction coefficient.
6. The display method according to claim 5,
the step of presetting the second preset relationship comprises the following steps:
calculating the luminous efficiency difference of the first sub-pixel and the second sub-pixel under the display duration threshold according to the luminous efficiency-time curves of the first sub-pixel and the second sub-pixel under different working current densities;
and calculating a correction coefficient corresponding to the display duration threshold of the first display area according to the luminous efficiency difference, wherein the brightness of the first display area is the same as that of the second display area when the plurality of first sub-pixels are controlled to emit light under the driving of the data signals corrected by the correction coefficient.
7. The display method according to claim 1,
after the display panel displays for a period of time, correcting the working current density of the plurality of first sub-pixels, including:
after receiving an instruction of displaying a monochromatic picture, controlling the display panel to display the monochromatic picture;
after receiving an instruction for adjusting a positive power signal or a data signal and a corresponding instruction value, controlling the plurality of first sub-pixels to emit light under the driving of the instruction value, and controlling the brightness of the first display area to be the same as the brightness of the second display area, wherein the instruction value comprises the adjusted positive power signal or the instruction value comprises the adjusted data signal,
recording the adjusted positive power supply signal as a corrected positive power supply signal; or recording the adjusted data signal as a correction data signal, and calculating a correction coefficient according to the correction data signal;
the display method further comprises the following steps: controlling a plurality of the first sub-pixels to emit light under the driving of the corrected positive power supply signal; or, controlling a plurality of the first sub-pixels to emit light under the driving of the data signal corrected by the correction factor.
8. The display method according to any one of claims 1 to 7,
the plurality of first sub-pixels includes a plurality of first sub-pixels configured to emit red light, a plurality of first sub-pixels configured to emit green light, and a plurality of first sub-pixels configured to emit blue light;
after the display panel displays for a period of time, correcting the working current density of the plurality of first sub-pixels, including: correcting at least an operating current density of the plurality of first sub-pixels configured to emit blue light.
9. The display method according to claim 1, wherein the display panel comprises at least one photosensitive element group, the photosensitive element group comprising a first photosensitive element located in the first display region and a second photosensitive element located in the second display region;
the plurality of first sub-pixels comprise at least one first monitored sub-pixel, and the first photosensitive element is adjacent to the first monitored sub-pixel;
the plurality of second sub-pixels comprise at least one second monitored sub-pixel, and the second photosensitive element is adjacent to the second monitored sub-pixel; wherein the first monitored sub-pixel and the second monitored sub-pixel are each configured to emit light of a first color;
after the display panel displays for a period of time, correcting the working current density of the plurality of first sub-pixels, including:
the first photosensitive element monitors the brightness of the first monitored sub-pixel to obtain a first brightness, and the second photosensitive element monitors the brightness of the second monitored sub-pixel to obtain a second brightness;
correcting an operating current density of the plurality of first sub-pixels configured to emit the first color light when a difference between the second luminance and the first luminance is equal to or greater than a first threshold value.
10. The display method according to claim 9,
correcting an operating current density of a plurality of the first subpixels configured to emit light of a first color, comprising:
correcting a positive power supply signal driving a plurality of the first sub-pixels configured to emit light of a first color;
alternatively, the data signal for driving the plurality of first sub-pixels configured to emit the first color light is corrected.
11. A display panel is characterized in that a display area of the display panel comprises a first display area and a second display area, the display area comprises a plurality of sub-pixels, the plurality of sub-pixels comprise a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first sub-pixels are positioned in the first display area, the plurality of second sub-pixels are positioned in the second display area, and the density of the plurality of first sub-pixels is smaller than that of the plurality of second sub-pixels; when the display panel displays, the working current density of the first sub-pixel is larger than that of the second sub-pixel;
the display panel further comprises a brightness correction module, wherein the brightness correction module is used for correcting the working current density of the first sub-pixels after the display panel displays for a period of time, and controlling the brightness of the first display area to be the same as that of the second display area.
12. The display panel according to claim 11,
the display panel comprises a positive power line, the positive power line comprises a first positive power line and a second positive power line, and the first positive power line and the second positive power line are not electrically connected with each other;
the plurality of second sub-pixels are electrically connected with the second positive power line;
the plurality of first sub-pixels include a plurality of first sub-pixels configured to emit red light, a plurality of first sub-pixels configured to emit green light, and a plurality of first sub-pixels configured to emit blue light, and each of the plurality of first sub-pixels configured to emit blue light is electrically connected to the first positive power supply line.
13. The display panel according to claim 12,
the first positive power line, the second positive power line, the third positive power signal line and the fourth positive power signal line are not electrically connected with each other in pairs; wherein,
a plurality of the first subpixels configured to emit red light are each electrically connected to the third positive power supply signal line, and a plurality of the first subpixels configured to emit green light are each electrically connected to the fourth positive power supply signal line.
14. The display panel according to any one of claims 11 to 13,
the display panel further comprises a clock module and a comparison module,
the clock module is electrically connected with the comparison module and is used for recording the total display duration of the display panel and sending the total display duration of the display panel to the comparison module;
the comparison module is electrically connected with the brightness correction module and is used for comparing the received total display duration of the display panel with a display duration threshold value and sending a correction instruction to the brightness correction module when the total display duration of the display panel reaches the display duration threshold value;
the brightness correction module is further used for correcting the working current densities of the first sub-pixels after receiving the correction instruction.
15. The display panel according to claim 14,
the brightness correction module includes a power signal correction sub-module,
the power signal correction submodule is used for selecting a corresponding positive power signal calculation value as a corrected positive power signal in a first preset relation after receiving the correction instruction, wherein the first preset relation is the corresponding relation between the display duration threshold and the positive power signal calculation value, when the total display duration of the display panel reaches the display duration threshold, the plurality of first subpixels are controlled to emit light under the driving of the positive power signal calculation value, and the brightness of the first display area is the same as that of the second display area;
the display panel further comprises a display driving module, wherein the display driving module is electrically connected with the brightness correction module and used for controlling the plurality of first sub-pixels to emit light under the drive of the corrected positive power supply signal.
16. The display panel according to claim 14,
the brightness correction module includes a data signal correction sub-module,
the data signal correction submodule is used for selecting a corresponding correction coefficient as a data signal correction coefficient in a second preset relationship after receiving the correction instruction, wherein the second preset relationship is the corresponding relationship between the display duration threshold and the correction coefficient, and when the total display duration of the display panel reaches the display duration threshold, the data signal correction submodule controls the first subpixels to emit light under the driving of the data signals corrected by the correction coefficient, and the brightness of the first display area is the same as that of the second display area;
the display panel further comprises a display driving module, wherein the display driving module is electrically connected with the brightness correction module and used for controlling the plurality of first sub-pixels to emit light under the driving of the data signals after the data signal correction coefficient is corrected.
17. The display panel according to any one of claims 11 to 13,
the display panel also comprises a display driving module which is electrically connected with the brightness correction module;
the display driving module is used for controlling the display panel to display the monochromatic picture after receiving the instruction of displaying the monochromatic picture;
the brightness correction module is used for generating a first control instruction after receiving an instruction for adjusting the positive power supply signal or the data signal and a corresponding instruction value, wherein the instruction value comprises the adjusted positive power supply signal or the instruction value comprises the adjusted data signal;
the display driving module is further configured to control the plurality of first sub-pixels to emit light under the driving of the instruction value after receiving the first control instruction, and control the luminance of the first display area to be the same as the luminance of the second display area;
the brightness correction module is further configured to record the adjusted positive power signal as a corrected positive power signal, or record the adjusted data signal as a corrected data signal, and calculate a correction coefficient according to the corrected data signal;
the display driving module is further used for controlling the plurality of first sub-pixels to emit light under the driving of the corrected positive power supply signal; or, controlling a plurality of the first sub-pixels to emit light under the driving of the data signal corrected by the correction factor.
18. The display panel according to any one of claims 11 to 13,
the display panel comprises at least one photosensitive element group, and the photosensitive element group comprises a first photosensitive element positioned in the first display area and a second photosensitive element positioned in the second display area;
the plurality of first sub-pixels comprise at least one first monitored sub-pixel, and the first photosensitive element is adjacent to the first monitored sub-pixel;
the plurality of second sub-pixels comprise at least one second monitored sub-pixel, and the second photosensitive element is adjacent to the second monitored sub-pixel; wherein the first monitored sub-pixel and the second monitored sub-pixel are each configured to emit light of a first color;
the display panel also comprises a brightness monitoring module which is electrically connected with the brightness correction module;
the brightness monitoring module includes: a first monitoring sub-module, a second monitoring sub-module, and a brightness comparison sub-module, wherein,
the first monitoring submodule is electrically connected with the first photosensitive element and is used for controlling the first photosensitive element to monitor the brightness of the first monitored sub-pixel to obtain first brightness;
the second monitoring submodule is electrically connected with the second photosensitive element and is used for controlling the second photosensitive element to monitor the brightness of the second monitored sub-pixel to obtain second brightness;
the brightness comparison sub-module is used for comparing the first brightness with the second brightness, and sending a correction instruction to the brightness correction module when the difference value between the second brightness and the first brightness is greater than or equal to a first threshold value;
the brightness correction module is used for correcting the working current density of the first sub-pixels which are configured to emit the first color light after receiving the correction instruction.
19. The display panel according to claim 18,
in a display area of the display panel: a plurality of the sub-pixels are arranged in sub-pixel rows along a first direction, a plurality of the sub-pixels are arranged in sub-pixel columns along a second direction, and the first direction and the second direction are crossed;
the first monitored sub-pixel is adjacent to the second display area, the second monitored sub-pixel is adjacent to the first display area, and the first monitored sub-pixel and the second monitored sub-pixel are located in the same sub-pixel row or the same sub-pixel column.
20. The display panel according to claim 18,
the brightness correction module includes a power supply signal correction sub-module for correcting a positive power supply signal driving a plurality of the first sub-pixels configured to emit a first color light; or,
the luminance correction module includes a data signal correction sub-module for correcting a data signal driving the plurality of first sub-pixels configured to emit the first color light.
21. A display device characterized by comprising the display panel according to any one of claims 12 to 20.
22. A brightness correction method of a display panel, wherein a display area of the display panel includes a first display area and a second display area, the display area includes a plurality of sub-pixels, the plurality of sub-pixels includes a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first sub-pixels are located in the first display area, the plurality of second sub-pixels are located in the second display area, a density of the plurality of first sub-pixels is less than a density of the plurality of second sub-pixels, an operating current density of the first sub-pixels is greater than an operating current density of the second sub-pixels when the display panel displays, the display panel further includes a display driving module and a brightness correction module, and the brightness correction method includes:
sending an instruction for displaying a monochromatic picture to the display driving module, and controlling the display panel to display the monochromatic picture;
and sending an instruction for adjusting the positive power supply signal or the data signal and a corresponding instruction value to the brightness correction module according to the operation of a user, and controlling the brightness of the first display area to be the same as that of the second display area, wherein the instruction value comprises the adjusted positive power supply signal or the instruction value comprises the adjusted data signal.
23. A storage medium, in which a computer program is stored which, when being executed by a processor, implements the luminance correction method as set forth in claim 22.
CN201910939336.7A 2019-09-30 2019-09-30 Display method, display panel, display device, luminance correction method, and storage medium Pending CN110610680A (en)

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Application publication date: 20191224