CN115831049A - Luminance degradation compensation method, luminance degradation compensation device and display device - Google Patents
Luminance degradation compensation method, luminance degradation compensation device and display device Download PDFInfo
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Abstract
According to the brightness decline compensation method, the brightness decline compensation device and the display device, the brightness decline degree of the organic light-emitting diode at the starting moment of the current time period is obtained; calculating a target current density flowing through the organic electroluminescent diode in the current time period; obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density; and performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period, so that targeted compensation can be performed, and the display uniformity of the display device is improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a brightness degradation compensation method, a brightness degradation compensation apparatus, and a display apparatus.
Background
An Organic Light-Emitting Diode (OLED) display device has characteristics of self-luminescence, simple structure, ultra-Light and thin, fast response speed, wide viewing angle, low power consumption, and flexible display, and is widely used in the display field. However, since the luminance characteristics of the organic material gradually deteriorate with the use time, the life span of the display device is directly affected.
The brightness decay model of an organic electroluminescent diode is generally considered as: f (t) = exp (- (t/τ) β ) Where τ is a decay time constant of the organic electroluminescent diode, β is a current density flowing through the organic electroluminescent diode, and t isThe duration of time.
The conventional compensation scheme for the brightness decline phenomenon is that a display driving chip continuously accumulates the working time of a display device, and then the current brightness decline degree is calculated in real time according to the model, so that the current intensity of the current for finally driving the organic electroluminescent diode is raised, and the compensation for the brightness decline phenomenon is realized.
However, the two constants τ and β are calculated in a fixed value, where τ is available for the same light emitting material, but β is related to the current density flowing through the organic electroluminescent diode, i.e. to the display frame of the display device. The driving current of each sub-pixel point is continuously changed in the working process of the display device, so that the existing scheme necessarily has the calculation distortion of the brightness decline degree. Meanwhile, because the change of the driving current experienced by each sub-pixel point is different, the conventional method cannot calculate the brightness decline degree of each sub-pixel point. And each sub-pixel point with different actual degradation degrees is mistaken for consistent degradation degrees, so that the same compensation value is adopted, and finally uneven display can be caused.
Disclosure of Invention
The application provides a brightness degradation compensation method, a brightness degradation compensation device and a display device, which can perform brightness compensation on an organic light-emitting diode, so that the display uniformity of the display device is improved.
In a first aspect, the present application provides a brightness degradation compensation method, which includes:
obtaining the brightness decline degree of the organic electroluminescent diode at the initial moment of the current time period;
calculating a target current density flowing through the organic electroluminescent diode in the current time period;
obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density; and
and performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period.
In the brightness degradation compensation method provided by the present application, the step of calculating the target current density flowing through the organic electroluminescent diode in the current time period includes:
acquiring each current density flowing through the organic light-emitting diode in the current time period and the duration corresponding to each current density;
and obtaining the target current density flowing through the organic light-emitting diode in the current time period according to each current density and each duration.
In the brightness degradation compensation method provided by the present application,
wherein β ave is a target current density flowing through the organic electroluminescent diode in the current time period, Δ t is a duration of the current time period, β ave is a threshold value of the current time period i Is a current density, t, flowing through the organic electroluminescent diode during the current time period i The duration of one current density.
In the brightness decay compensation method provided by the application, the current density corresponds to at least one display gray scale.
In the brightness decay compensation method provided by the application, the number of the display gray scales corresponding to the current density is gradually decreased from the low gray scale to the high gray scale.
In the brightness degradation compensation method provided by the present application, the step of obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting time of the current time period and the target current density includes:
obtaining the equivalent decayed time of the organic electroluminescent diode in the current time period according to the brightness decayed degree of the organic electroluminescent diode at the starting time of the current time period and the target current density;
and obtaining the brightness degradation degree of the organic light-emitting diode in the current time period according to the equivalent degraded time and the target current density.
In the brightness degradation compensation method provided by the present application,
wherein tau is decay time constant of the organic electroluminescent diode, beta ave Is the target current density f flowing through the organic electroluminescent diode in the current time period 0 Is the brightness decline degree, t, of the organic electroluminescent diode at the starting time of the current time period 0 And the equivalent decayed time of the organic electroluminescent diode in the current time period is obtained.
In the brightness degradation compensation method provided by the present application,
wherein, tau is the decay time constant of the organic electroluminescent diode, beta ave Is the target current density, t, flowing through the organic electroluminescent diode in the current time period 0 Is the equivalent decayed time of the organic electroluminescent diode in the current time period, delta t is the duration of the current time period, f 1 The brightness decline degree of the organic light-emitting diode in the current time period is obtained.
In the brightness degradation compensation method provided by the present application, the step of performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period includes:
acquiring an input gray scale;
obtaining a driving current value corresponding to the input gray scale in a gray scale-current mapping relation table according to the input gray scale;
obtaining an actual driving current value based on the driving current value and the brightness degradation degree of the organic light-emitting diode in the current time period;
and obtaining a display gray scale corresponding to the actual drive current value in a current-gray scale mapping relation table according to the actual drive current value.
In the brightness degradation compensation method provided by the present application, the step of performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period includes:
acquiring an input gray scale;
obtaining a driving current value corresponding to the input gray scale in a gray scale-current mapping relation table according to the input gray scale;
obtaining an actual driving current value based on the driving current value and the brightness degradation degree of the organic light-emitting diode in the current time period;
and driving the corresponding light emitting diode according to the actual driving current value.
In a second aspect, the present application also provides a luminance degradation compensation apparatus, comprising:
the device comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring the brightness decline degree of the organic electroluminescent diode at the starting moment of the current time period;
a calculation module that calculates a target current density flowing through the organic electroluminescent diode in the current period;
the processing module is used for obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density;
and the compensation module is used for carrying out brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period.
In a third aspect, the present application further provides a display device, which includes a display panel and a timing controller electrically connected to the display panel, wherein the timing controller is configured to perform the brightness degradation compensation method.
According to the brightness decline compensation method, the brightness decline compensation device and the display device, the brightness decline degree of the organic light-emitting diode at the starting moment of the current time period is obtained; calculating a target current density flowing through the organic electroluminescent diode in the current time period; obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density; and performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period, so that targeted compensation can be performed, and the display uniformity of the display device is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of the sub-pixel shown in FIG. 1;
fig. 3 is a schematic flowchart of a brightness degradation compensation method according to an embodiment of the present disclosure;
fig. 4 is a graph illustrating a luminance degradation curve of an organic electroluminescent diode according to an embodiment of the present disclosure;
fig. 5 is a flowchart illustrating a step 20 of a brightness degradation compensation method according to an embodiment of the present application;
FIG. 6 is a diagram illustrating a relationship between current density and display gray scale;
fig. 7 is a flowchart illustrating a step 30 of a brightness degradation compensation method according to an embodiment of the present application;
fig. 8 is a flowchart illustrating a specific process of step 40 in the brightness degradation compensation method according to the embodiment of the present application;
fig. 9 is a schematic illustration of step 40 in the brightness degradation compensation method provided in the embodiment of the present application;
fig. 10 is another specific flowchart of step 40 of the brightness degradation compensation method according to the embodiment of the present application;
fig. 11 is a schematic structural diagram of a luminance degradation compensation apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the described embodiments are merely a few embodiments of the present application 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 application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure. It should be noted that the display device shown in fig. 1 is only a schematic illustration, and is intended to illustrate that the brightness degradation compensation method provided by the embodiment of the present application can be used in the display device.
As shown in fig. 1, the display device according to the embodiment of the present application includes an image processor 110, a timing controller 120, a data driver 130, a scan driver 140, and a display panel 150.
The image processor 110 outputs a DATA enable signal DE, etc. and an externally provided DATA signal DATA. The image processor 110 may output one or more signals of a vertical synchronization signal, a horizontal synchronization signal, and a clock signal in addition to the data enable signal DE. For convenience of explanation, these signals are omitted in the drawings.
The timing controller 120 receives the DATA signal DATA and the DATA enable signal DE or driving signals including a vertical sync signal, a horizontal sync signal, and a clock signal from the image processor 110. The timing controller 120 outputs a gate timing control signal GDC for controlling the operation timing of the scan driver 140 and a data timing control signal DDC for controlling the operation timing of the data driver 130 based on the driving signals.
The DATA driver 130 samples and latches the DATA signal DATA supplied from the timing controller 120 in response to the DATA timing control signal DDC supplied from the timing controller 120, and converts the signal into a gamma reference voltage and outputs it. The DATA driver 130 provides the DATA lines DL1 to DLn to output the DATA signal DATA. The data driver 130 may be provided in the form of an IC (integrated circuit).
The scan driver 140 outputs a scan signal while shifting the level of the gate voltage in response to the gate timing control signal GDC supplied from the timing controller 120. The scan driver 140 outputs scan signals through the scan lines GL1 to GLm. The scan driver 140 may be provided in the form of an IC (integrated circuit), or may be disposed on the display panel 150 in the form of an in-panel gate.
The display panel 150 displays an image in response to the DATA signal DATA and the scan signal supplied from the DATA driver 130 and the scan driver 140, respectively. The display panel 150 includes subpixels SP for displaying an image. The sub-pixels SP may include red, green, and blue sub-pixels, or may include white, red, green, and blue sub-pixels.
Further, referring to fig. 2, fig. 2 and fig. 2 are schematic circuit diagrams of the sub-pixel shown in fig. 1. It should be noted that the sub-pixel shown in fig. 2 is only a schematic illustration. It is understood that the sub-pixels include organic electroluminescent diodes.
As shown in fig. 2, one sub-pixel includes a switching transistor SW, a driving transistor DR, a capacitor Cst, and an organic electroluminescent diode OLED. The switching transistor SW functions as a switch in response to a scan signal supplied through the first scan line GL1 to store a data signal supplied through the first data line DL1 as a data voltage in the capacitor Cst. The driving transistor DR is used to flow a driving current between the first power line EVDD and the second power line EVSS according to the data voltage stored in the capacitor Cst. The organic electroluminescent diode OLED serves to emit light according to a driving current formed through the driving transistor DR. Of course, in some embodiments, the sub-pixels may also include compensation circuitry; the compensation circuit is a circuit added to the sub-pixel to compensate for the threshold voltage of the driving transistor DR and the like. The compensation circuit may be composed of one or more transistors.
Referring to fig. 3, fig. 3 is a schematic flowchart illustrating a luminance degradation compensation method according to an embodiment of the present disclosure. The brightness degradation compensation method may be applied to the display device described above. As shown in fig. 3, a specific flow of the brightness degradation compensation method provided in the embodiment of the present application may be as follows:
10. and acquiring the brightness decline degree of the organic light-emitting diode at the initial moment of the current time period.
The brightness recession degree represents the ratio of the current brightness to the original brightness of the organic light-emitting diode under the same current; the degree of luminance degradation is a value of 0 to 1, and generally, the degree of luminance degradation of the organic electroluminescent diode gradually decreases from 1 as the organic electroluminescent diode is used. For example, referring to fig. 4, fig. 4 is a graph illustrating a luminance degradation curve of an organic electroluminescent diode according to an embodiment of the present disclosure. As shown in fig. 4, the organic electroluminescent diode has no degradation degree at time t 0; at this time, the luminance degradation degree of the organic electroluminescent diode is 1.
In the period from t0 to t1, the brightness decay degree of the organic electroluminescent diode corresponds to the beta 1 curve in the graph. the brightness degradation degree of the organic electroluminescent diode at the time t1 can be known as L1 according to the β 1 curve. the brightness of the organic electroluminescent diode is degraded to a degree L1 at time t 1.
In the period from t1 to t2, the brightness decay degree of the organic electroluminescent diode corresponds to a beta 2 curve in the graph. the brightness degradation degree of the organic electroluminescent diode at the time t2 can be known as L2 according to the β 2 curve.
In the period from t2 to t3, the brightness decay degree of the organic electroluminescent diode corresponds to the beta 3 curve in the graph. the brightness degradation degree of the organic electroluminescent diode at the time t3 can be known as L3 according to the β 3 curve.
In the period from t3 to t4, the brightness decay degree of the organic electroluminescent diode corresponds to the beta 4 curve in the graph. The brightness degradation degree of the organic electroluminescent diode at the time T4 can be known as L4 according to the β 4 curve.
In the period from t4 to t5, the brightness decay degree of the organic electroluminescent diode corresponds to the beta 5 curve in the graph. the brightness degradation degree of the organic electroluminescent diode at the time t5 can be known as L5 according to the β 5 curve.
It should be noted that the brightness degradation degree of the organic electroluminescent diode at the starting time of the current time period may be stored in the display device in advance and automatically updated with the use of the organic electroluminescent diode. Such as: in the time period from t0 to t1, the brightness decline degree of the organic electroluminescent diode is initially set to 1 and stored in the display device, along with the use of the organic electroluminescent diode, in the time period from t1, the brightness decline degree of the organic electroluminescent diode is updated to L1, in the time period from t2, the brightness decline degree of the organic electroluminescent diode is updated to L2, in the time period from t3, the brightness decline degree of the organic electroluminescent diode is updated to L3, in the time period from t4, the brightness decline degree of the organic electroluminescent diode is updated to L4, and in the time period from t5, the brightness decline degree of the organic electroluminescent diode is updated to L5.
And step 20, calculating the target current density flowing through the organic light-emitting diode in the current time period.
In the current time period, the organic light-emitting diode corresponds to a plurality of current densities, and each current density lasts for a certain time. The target current density may be calculated according to a preset rule based on a plurality of current densities and a plurality of durations. The preset rules can be adjusted according to actual needs.
In some embodiments, please refer to fig. 5, wherein fig. 5 is a flowchart illustrating a specific process of step 20 in the brightness degradation compensation method according to an embodiment of the present disclosure. As shown in fig. 5, the step of calculating the target current density flowing through the organic electroluminescent diode in the current time period includes the following specific steps:
And step 202, obtaining the target current density flowing through the organic light-emitting diode in the current time period according to each current density and each duration.
Wherein, the calculation formula of the target current density is as follows:
wherein, beta ave Is the target current density flowing through the organic electroluminescent diode in the current time period, delta t is the duration of the current time period, beta i A current density, t, for the current time period i The duration of one current density.
It should be noted that the current density may correspond to at least one display gray level. In some embodiments, the current density corresponds to one display gray scale, so that the compensation effect can be better. In other embodiments, it is not necessary to have one current density for each display gray scale, and a method of having a current density corresponding to a plurality of display gray scales may be used, so that the cost may be reduced.
Of course, the target current density flowing through the organic electroluminescent diode in the current time period can be obtained in other manners. For example: and acquiring the median of the current densities in the current time period, and taking the median as the target current density flowing through the organic light-emitting diode in the current time period. For another example: and taking the maximum value, the minimum value or any value and the like as the target current density flowing through the organic light-emitting diode in the current time period.
Specifically, referring to fig. 6, fig. 6 is a schematic diagram illustrating a corresponding relationship between current density and display gray scale. As shown in fig. 6, the number of display gray scales corresponding to the current density gradually decreases from the low gray scale to the high gray scale. That is, the sharing of a typical current density by segments may be employed to reduce the summing logic size. Because the brightness decays faster than the low gray scale and low current under the high gray scale and high current, the method of high gray scale section density and low gray scale section sparse is generally adopted.
For example, the number of display gradations corresponding to the current density β 1 is larger than the number of display gradations corresponding to the current density β 2, the number of display gradations corresponding to the current density β 2 is larger than the number of display gradations corresponding to the current density β 3, the number of display gradations corresponding to the current density β 3 is larger than the number of display gradations corresponding to the current density β 4, the number of display gradations corresponding to the current density β 4 is larger than the number of display gradations corresponding to the current density β 5, the number of display gradations corresponding to the current density β 5 is larger than the number of display gradations corresponding to the current density β 6, the number of display gradations corresponding to the current density β 6 is larger than the number of display gradations corresponding to the current density β 7, and the number of display gradations corresponding to the current density β 7 is larger than the number of display gradations corresponding to the current density β 8.
For another example, in the gray levels of 0 to 255, 0 to 30% of the display gray levels correspond to β 1, 30 to 50% of the display gray levels correspond to β 2, 50 to 70% of the display gray levels correspond to β 3, 70 to 80% of the display gray levels correspond to β 4, 80 to 90% of the display gray levels correspond to β 5, 90 to 95% of the display gray levels correspond to β 6, 95 to 98% of the display gray levels correspond to β 7, and 98 to 100% of the display gray levels correspond to β 8.
And step 30, obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density.
In some embodiments, please refer to fig. 7, and fig. 7 is a flowchart illustrating a specific process of step 30 in the brightness degradation compensation method according to the embodiment of the present disclosure. As shown in fig. 7, the step of obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting time of the current time period and the target current density includes the following specific steps:
step 301, obtaining the equivalent decayed time of the organic electroluminescent diode in the current time period according to the brightness decayed degree of the organic electroluminescent diode at the starting time of the current time period and the target current density.
And 302, obtaining the brightness degradation degree of the organic light-emitting diode in the current time period according to the equivalent degraded time and the target current density.
Wherein,
wherein tau is the decay time constant of the organic electroluminescent diode, beta ave Target current density, f, for the current time period flowing through the organic electroluminescent diode 0 The brightness decay degree t of the organic electroluminescent diode at the initial moment of the current time period 0 The equivalent decayed time of the organic electroluminescent diode in the current time period is shown.
Wherein,
wherein tau is decay time constant of the organic electroluminescent diode, beta ave Is the target current density, t, flowing through the organic electroluminescent diode in the current time period 0 Is the equivalent decayed time of the organic electroluminescent diode in the current time period, delta t is the duration of the current time period, f 1 The brightness of the organic electroluminescent diode is degraded in the current time period.
Specifically, the formula calculation of the brightness decay curve is only needed to be performed on the organic light-emitting diode once in each period of duration, so that hardware can only design one set of calculation logic, and the brightness decay degree of the organic light-emitting diode is calculated in a pipeline manner in each period of duration, thereby greatly reducing hardware consumption.
And step 40, performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period.
In some embodiments, please refer to fig. 8, and fig. 8 is a flowchart illustrating a specific process of step 40 in the brightness degradation compensation method according to the embodiment of the present disclosure. As shown in fig. 8, the step of performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period includes the following specific steps:
And 403, obtaining an actual driving current value based on the driving current value and the brightness degradation degree of the current time period.
And 404, obtaining a display gray scale corresponding to the actual driving current value in the current-gray scale mapping relation table according to the actual driving current value.
Specifically, referring to fig. 9, fig. 9 is a schematic illustration showing a step 40 in the brightness degradation compensation method according to the embodiment of the present application. As shown in fig. 8 and 9, when performing the brightness compensation, it is necessary to first obtain a driving current value according to the gray scale-current mapping relation table for the input gray scale, then divide the driving current value by the brightness degradation degree of the current time period to obtain an actual driving current value that needs to be raised, and finally obtain a required display gray scale according to the current-gray scale mapping relation table, so as to complete the compensation.
According to the brightness degradation compensation method, the brightness degradation compensation device and the display device, the brightness degradation degree of the organic light-emitting diode at the starting time of the current time period is obtained; calculating the target current density flowing through the organic light-emitting diode in the current time period; obtaining the brightness decline degree of the organic electroluminescent diode in the current time period based on the brightness decline degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density; and performing brightness compensation on the organic light-emitting diode according to the brightness degradation degree of the organic light-emitting diode in the current time period, so that targeted compensation can be performed, and the display uniformity of the display device is improved.
In some embodiments, please refer to fig. 10, where fig. 10 is another specific flowchart of step 40 in the brightness degradation compensation method according to the embodiment of the present application. As shown in fig. 10, the step of performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period includes the following specific steps:
And 403, obtaining an actual driving current value based on the driving current value and the brightness degradation degree of the current time period.
And step 404, driving the corresponding light emitting diode according to the actual driving current value.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a luminance degradation compensation apparatus according to an embodiment of the present disclosure. As shown in fig. 11, the luminance degradation compensation apparatus 50 according to the embodiment of the present application includes an obtaining module 501, a calculating module 502, a processing module 503, and a compensating module 504.
The obtaining module 501 is configured to obtain a brightness degradation degree of the organic electroluminescent diode at a starting time of a current time period. The calculation module 502 calculates a target current density flowing through the organic electroluminescent diode during the current period. The processing module 503 is configured to obtain the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting time of the current time period and the target current density. The compensation module 504 is configured to perform brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period.
In some embodiments, the calculation module 502 is specifically configured to perform the following steps: acquiring each current density flowing through the organic light-emitting diode in the current time period and the duration corresponding to each current density; and obtaining the target current density flowing through the organic light-emitting diode in the current time period according to each current density and each duration.
Wherein,
，
wherein β ave is the target current density flowing through the organic electroluminescent diode in the current time period, Δ t is the duration of the current time period, β i A current density, t, flowing through the organic electroluminescent diode during the current time period i The duration of one current density.
In some embodiments, the processing module 503 is specifically configured to perform the following steps: obtaining the equivalent decayed time of the organic electroluminescent diode in the current time period according to the brightness decayed degree of the organic electroluminescent diode at the initial time of the current time period and the target current density; and obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period according to the equivalent degraded time and the target current density.
Wherein,
wherein tau is the decay time constant of the organic electroluminescent diode, beta ave Target current density, f, for the current time period flowing through the organic electroluminescent diode 0 The brightness decay degree, t, of the organic electroluminescent diode at the initial time of the current time period 0 The equivalent decayed time of the organic electroluminescent diode in the current time period is shown.
Wherein,
wherein tau is the decay time constant of the organic electroluminescent diode, beta ave Is the target current density, t, flowing through the organic electroluminescent diode in the current time period 0 Is the equivalent decayed time of the organic electroluminescent diode in the current time period, delta t is the duration of the current time period, f 1 The brightness degradation degree of the organic electroluminescent diode in the current time period.
In some embodiments, the compensation module 504 is specifically configured to perform the following steps: acquiring an input gray scale; obtaining a driving current value corresponding to the input gray scale in a gray scale-current mapping relation table according to the input gray scale; obtaining an actual driving current value based on the driving current value and the brightness degradation degree of the organic light-emitting diode in the current time period; and obtaining a display gray scale corresponding to the actual drive current value in the current-gray scale mapping relation table according to the actual drive current value.
The brightness degradation compensation device 50 provided by the present application obtains the brightness degradation degree of the organic electroluminescent diode at the starting time of the current time period through the obtaining module 501; the calculating module 502 calculates the target current density flowing through the organic electroluminescent diode in the current time period; the processing module 503 obtains the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting time of the current time period and the target current density; and the compensation module 504 performs brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period, so that targeted compensation can be performed, and the display uniformity of the brightness degradation compensation device 50 is improved.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.
Claims (12)
1. A method of luminance degradation compensation, comprising:
obtaining the brightness decline degree of the organic electroluminescent diode at the initial moment of the current time period;
calculating a target current density flowing through the organic electroluminescent diode in the current time period;
obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density; and
and performing brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period.
2. The method of claim 1, wherein the step of calculating the target current density flowing through the organic electroluminescent diode in the current time period comprises:
acquiring each current density flowing through the organic light-emitting diode in the current time period and the duration corresponding to each current density;
and obtaining the target current density flowing through the organic light-emitting diode in the current time period according to each current density and each duration.
3. The luminance degradation compensation method of claim 2,
wherein, beta ave Is the target current density flowing through the organic electroluminescent diode in the current time period, delta t is the duration of the current time period, beta i Is a current density, t, flowing through the organic electroluminescent diode during the current time period i The duration of one current density.
4. The method of claim 2, wherein the current density corresponds to at least one display gray level.
5. The method as claimed in claim 4, wherein the number of display gray scales corresponding to the current density decreases gradually from a low gray scale to a high gray scale.
6. The method of claim 1, wherein the step of obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting time of the current time period and the target current density comprises:
obtaining the equivalent decayed time of the organic electroluminescent diode in the current time period according to the brightness decayed degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density;
and obtaining the brightness degradation degree of the organic light-emitting diode in the current time period according to the equivalent degraded time and the target current density.
7. The luminance degradation compensation method of claim 6,
wherein tau is the decay time constant of the organic electroluminescent diode, beta ave Is the target current density f flowing through the organic electroluminescent diode in the current time period 0 The brightness decline degree, t, of the organic electroluminescent diode at the starting time of the current time period 0 And the equivalent decayed time of the organic light-emitting diode in the current time period is obtained.
8. The luminance degradation compensation method of claim 6,
wherein tau is the decay time constant of the organic electroluminescent diode, beta ave Is the target current density, t, flowing through the organic electroluminescent diode in the current time period 0 Is the equivalent decayed time of the organic electroluminescent diode in the current time period, delta t is the duration of the current time period, f 1 The brightness degradation degree of the organic light-emitting diode in the current time period is shown.
9. The method for compensating for brightness degradation according to claim 1, wherein the step of compensating for brightness of the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period comprises:
acquiring an input gray scale;
obtaining a driving current value corresponding to the input gray scale in a gray scale-current mapping relation table according to the input gray scale;
obtaining an actual driving current value based on the driving current value and the brightness degradation degree of the organic light-emitting diode in the current time period;
and obtaining a display gray scale corresponding to the actual drive current value in a current-gray scale mapping relation table according to the actual drive current value.
10. The method for compensating for brightness degradation according to claim 1, wherein the step of compensating for brightness of the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period comprises:
acquiring an input gray scale;
obtaining a driving current value corresponding to the input gray scale in a gray scale-current mapping relation table according to the input gray scale;
obtaining an actual driving current value based on the driving current value and the brightness degradation degree of the organic light-emitting diode in the current time period;
and driving the corresponding light emitting diode according to the actual driving current value.
11. A luminance degradation compensation apparatus, comprising:
the device comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring the brightness decline degree of the organic electroluminescent diode at the starting moment of the current time period;
a calculation module that calculates a target current density flowing through the organic electroluminescent diode in the current period;
the processing module is used for obtaining the brightness degradation degree of the organic electroluminescent diode in the current time period based on the brightness degradation degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density;
and the compensation module is used for carrying out brightness compensation on the organic electroluminescent diode according to the brightness degradation degree of the organic electroluminescent diode in the current time period.
12. A display device comprising a display panel and a timing controller electrically connected to the display panel, the timing controller being configured to perform the brightness degradation compensation method according to any one of claims 1 to 10.
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| PCT/CN2023/127566 WO2024131281A1 (en) | 2022-12-22 | 2023-10-30 | Luminance decay compensation method, luminance decay compensation apparatus, and display apparatus |
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| WO2024131281A1 (en) * | 2022-12-22 | 2024-06-27 | 惠州华星光电显示有限公司 | Luminance decay compensation method, luminance decay compensation apparatus, and display apparatus |
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| US8248392B2 (en) * | 2004-08-13 | 2012-08-21 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device using light emitting element and driving method of light emitting element, and lighting apparatus |
| US8456390B2 (en) * | 2011-01-31 | 2013-06-04 | Global Oled Technology Llc | Electroluminescent device aging compensation with multilevel drive |
| KR101228885B1 (en) * | 2011-12-21 | 2013-02-01 | 엘지디스플레이 주식회사 | Organic light emitting display device and method for manufacturing the same |
| CN108281102A (en) * | 2018-01-31 | 2018-07-13 | 京东方科技集团股份有限公司 | The detection device and method of AMOLED display device, prosthetic device and method, repair system |
| US10923025B2 (en) * | 2018-04-11 | 2021-02-16 | Boe Technology Group Co., Ltd. | Pixel compensation circuit, method for compensating pixel driving circuit, and display device |
| CN111402797B (en) * | 2020-03-30 | 2022-02-22 | 昆山国显光电有限公司 | Brightness uniformity compensation method and device and display equipment |
| CN112102775B (en) * | 2020-09-11 | 2022-01-11 | Oppo广东移动通信有限公司 | Display device and brightness compensation method thereof |
| CN113096583B (en) * | 2021-04-22 | 2024-07-30 | Oppo广东移动通信有限公司 | Compensation method and device of light emitting device, display module and readable storage medium |
| CN114078437B (en) * | 2021-11-23 | 2023-07-28 | 京东方科技集团股份有限公司 | Brightness compensation method, display panel and display device |
| CN115171604A (en) * | 2022-06-30 | 2022-10-11 | 昆山国显光电有限公司 | Display panel compensation method, compensation device, display panel and memory |
| CN115831049A (en) * | 2022-12-22 | 2023-03-21 | Tcl华星光电技术有限公司 | Luminance degradation compensation method, luminance degradation compensation device and display device |
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