CN109545143B - Display panel and compensation method thereof - Google Patents
Display panel and compensation method thereof Download PDFInfo
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- CN109545143B CN109545143B CN201910067404.5A CN201910067404A CN109545143B CN 109545143 B CN109545143 B CN 109545143B CN 201910067404 A CN201910067404 A CN 201910067404A CN 109545143 B CN109545143 B CN 109545143B
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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]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Abstract
The invention provides a display panel and a compensation method thereof, wherein the method comprises the following steps: after fingerprint unlocking is carried out through a display panel, image data of a current frame picture is obtained, and a fingerprint identification area is determined; acquiring a reference current value corresponding to a pixel unit in a fingerprint identification area according to image data of a current frame picture; controlling a display panel to display the current frame according to the image data of the current frame, and detecting the current light-emitting driving current of a pixel unit in a fingerprint identification area; and respectively compensating the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area. Therefore, the life attenuation caused by highlight display of the fingerprint identification area can be effectively compensated, the problem that the color and the brightness of the area are inconsistent with those of other positions due to the life attenuation of the fingerprint identification area is solved, and meanwhile, the cost is saved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a compensation method thereof.
Background
Since the AMO L ED (Active-matrix Organic L light-Emitting Diode) does not need the self-luminous property of the backplane, light can pass through the gap in the middle of the pixel, and the fingerprint sensor can collect fingerprint information above the screen below the screen, so that the screen fingerprint identification scheme becomes feasible.
In the related art, the optical fingerprint identification scheme generally requires that the screen display blue-green highlighting (for example, more than 500 nits) at the sensor position so as to facilitate fingerprint acquisition, but has the problem that due to the inherent characteristics of AMO L ED, long-term display at the same position accelerates the life decay of a light emitting device such as a light emitting diode, so that the brightness or color of the fingerprint identification area is inconsistent with that of other areas.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, a first object of the present invention is to provide a compensation method for a display panel, so as to effectively compensate for lifetime degradation caused by highlighting of a fingerprint identification area.
A second object of the present invention is to provide a display panel.
To achieve the above object, an embodiment of a first aspect of the present invention provides a compensation method for a display panel, including: after fingerprint unlocking is carried out through the display panel, image data of a current frame picture is obtained, and a fingerprint identification area is determined; acquiring a reference current value corresponding to a pixel unit in the fingerprint identification area according to the image data of the current frame picture; controlling the display panel to display the current frame according to the image data of the current frame, and detecting the current light-emitting driving current of the pixel unit in the fingerprint identification area; and respectively compensating the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area.
According to the compensation method of the display panel provided by the embodiment of the invention, after fingerprint unlocking is carried out on the display panel, image data of a current frame picture is obtained, a fingerprint identification area is determined, then a reference current value corresponding to a pixel unit in the fingerprint identification area is obtained according to the image data of the current frame picture, the display panel is controlled to display the current frame picture according to the image data of the current frame picture, current light-emitting driving currents of the pixel units in the fingerprint identification area are detected, and finally the pixel units in the fingerprint identification area are respectively compensated according to the current light-emitting driving currents and the reference current value corresponding to the pixel units in the fingerprint identification area. Therefore, the compensation method of the display panel provided by the embodiment of the invention can effectively compensate the life attenuation caused by highlight display of the fingerprint identification area, further solve the problem that the color and brightness of the area are inconsistent with other positions due to the life attenuation of the fingerprint identification area, keep the display uniformity after long-term use and effectively save the cost.
According to an embodiment of the present invention, obtaining a reference current value corresponding to a pixel unit in the fingerprint identification area according to the image data of the current frame picture includes: determining the gray scale corresponding to the pixel unit in the fingerprint identification area according to the image data of the current frame picture; and determining a reference current value corresponding to the pixel unit in the fingerprint identification area through a preset corresponding relation according to the gray scale corresponding to the pixel unit in the fingerprint identification area, wherein the preset corresponding relation is used for indicating the corresponding relation between the gray scale and the reference current value.
According to an embodiment of the present invention, the compensating the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area includes: acquiring a current difference value between the current light-emitting driving current and a reference current value of the pixel unit; and if the current difference is larger than a preset current threshold, compensating the pixel units in the fingerprint identification area according to the current difference.
According to an embodiment of the present invention, the compensating the pixel unit in the fingerprint identification area according to the current difference value includes: generating a bias voltage according to the current difference; and compensating the gate driving voltage of the pixel unit according to the bias voltage so that the pixel unit generates a light-emitting driving current according to the compensated gate driving voltage.
According to one embodiment of the invention, if the difference value is less than or equal to a preset threshold value, the compensation of the pixel units in the fingerprint identification area is stopped until the next fingerprint unlocking.
To achieve the above object, a second embodiment of the present invention provides a display panel, including: the control module is used for acquiring image data of a current frame picture after fingerprint unlocking is carried out through the display panel, determining a fingerprint identification area, and acquiring a reference current value corresponding to a pixel unit in the fingerprint identification area according to the image data of the current frame picture, and the control module is also used for controlling the display panel to display the current frame picture according to the image data of the current frame picture; the current detection module is used for detecting the current light-emitting driving current of the pixel units in the fingerprint identification area; and the compensation module is used for compensating the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area.
According to the display panel provided by the embodiment of the invention, after fingerprint unlocking is carried out, firstly, the image data of a current frame picture is obtained through the control module, the fingerprint identification area is determined, the reference current value corresponding to the pixel unit in the fingerprint identification area is obtained according to the image data of the current frame picture, meanwhile, the display panel is controlled to display the current frame picture according to the image data of the current frame picture, then, the current light-emitting driving current of the pixel unit in the fingerprint identification area is detected through the current detection module, and finally, the pixel unit in the fingerprint identification area is compensated through the compensation module according to the current light-emitting driving current and the reference current value corresponding to the pixel unit in the fingerprint identification area. Therefore, the display panel provided by the embodiment of the invention can effectively compensate the life attenuation caused by highlight display of the fingerprint identification area, further solve the problem that the color and brightness of the area are inconsistent with other positions due to the life attenuation of the fingerprint identification area, keep the display uniformity after long-term use and effectively save the cost.
According to an embodiment of the present invention, the control module is further configured to determine gray scales corresponding to the pixel units in the fingerprint identification area according to the image data of the current frame picture, and determine the reference current values corresponding to the plurality of pixel units in the fingerprint identification area according to the gray scales corresponding to the pixel units in the fingerprint identification area through a preset corresponding relationship, where the preset corresponding relationship is used to indicate a corresponding relationship between the gray scales and the reference current values.
According to an embodiment of the present invention, the compensation module is configured to obtain a current difference between a current light-emitting driving current of the pixel unit and a reference current value, and compensate the pixel unit in the fingerprint identification area according to the current difference when the current difference is greater than a preset current threshold.
According to an embodiment of the present invention, the compensation module is configured to generate a bias voltage according to the current difference, and compensate the gate driving voltage of the pixel unit according to the bias voltage, so that the pixel unit generates a light emitting driving current according to the compensated gate driving voltage.
According to an embodiment of the present invention, the compensation module is configured to stop compensating the pixel units in the fingerprint identification area until next fingerprint unlocking when the difference is smaller than or equal to a preset threshold.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flowchart illustrating a compensation method for a display panel according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a compensation method for a display panel according to an embodiment of the invention;
FIG. 3 is a flowchart illustrating a compensation method for a display panel according to another embodiment of the present invention;
FIG. 4 is a flowchart illustrating a compensation method for a display panel according to another embodiment of the present invention;
FIG. 5 is a block diagram of a display panel according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a display panel according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A display panel and a compensation method thereof according to an embodiment of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a compensation method of a display panel according to an embodiment of the invention. As shown in fig. 1, the compensation method of the display panel according to the embodiment of the present invention includes the following steps:
s1, acquiring image data of the current frame picture after fingerprint unlocking through the display panel, and determining a fingerprint identification area.
The current frame can be sent to a RAM (Random Access Memory) of a DDIC (display Integrated Circuit) through an Access Point (AP) terminal, so as to obtain image data of the current frame. For example, after the fingerprint is unlocked, the first frame image after the fingerprint is unlocked may be sent to the DDIC, and after the first frame image is displayed, the second frame image is sent to the DDIC, so that the subsequent frames are sent to the DDIC frame by frame.
And S2, acquiring the reference current value corresponding to the pixel unit in the fingerprint identification area according to the image data of the current frame picture.
After the image data of the current frame picture is acquired, the fingerprint identification area can be determined, the image data of the fingerprint identification area stored in the RAM is analyzed through the DDIC, and then the reference current value corresponding to the pixel unit in the fingerprint identification area is acquired.
In the embodiment of the present invention, as shown in fig. 2, obtaining the reference current value corresponding to the pixel unit in the fingerprint identification area according to the image data of the current frame further includes the following steps:
s20, determining the gray scale corresponding to the pixel unit in the fingerprint identification area according to the image data of the current frame picture.
And S21, determining a reference current value corresponding to the pixel unit in the fingerprint identification area according to the gray scale corresponding to the pixel unit in the fingerprint identification area through a preset corresponding relation, wherein the preset corresponding relation is used for indicating the corresponding relation between the gray scale and the reference current value.
It can be understood that, due to the difference of the display panels, in the process of Gamma calibration, the reference current when the calibration of each binding point is completed needs to be recorded as the factory default reference value during the production of the module. The method includes the steps that each binding point gray scale picture stored in the RAM is sequentially displayed on a screen, namely, the pixel units in the display panel are controlled to sequentially display the corresponding gray scale pictures, when each binding point gray scale picture is displayed, the light-emitting driving current of the pixel units in the display panel is collected (the pixel units can be located in a non-fingerprint identification area or a fingerprint identification area), namely, the current flowing through a DTFT (Drive Thin film transistor) in the pixel units is collected, the collected current when each binding point gray scale picture is displayed is stored in the RAM and serves as a factory default current reference value, and therefore the corresponding relation between the gray scale and the reference current value can be determined.
It should also be understood that, in view of the overall lifetime degradation of the AMO L ED in long-term use, to prevent overcompensation of the fingerprint identification region, after the display panel has been used for a preset time, the current of the pixel cells in the non-fingerprint identification region may be detected, and the reference current, i.e., the correspondence between the gray level and the reference current value, of each of the tie points may be recalibrated according to the current of the pixel cells in the non-fingerprint identification region.
The preset time can be preset according to the actual condition of the display panel.
Therefore, in the embodiment of the invention, after the gray scale corresponding to the pixel unit in the fingerprint identification area is determined, the reference current value corresponding to the pixel unit in the fingerprint identification area can be determined through the preset corresponding relation.
S3, controlling the display panel to display the current frame picture according to the image data of the current frame picture, and detecting the current light-emitting drive current of the pixel unit in the fingerprint identification area; specifically, when the display panel is controlled to display the current frame of picture according to the image data of the current frame of picture, the gate driving voltage of the pixel unit can be generated according to the image data of the current frame of picture, so that the pixel unit generates the light-emitting driving current according to the received gate driving voltage.
After the current frame picture is displayed, the current luminous driving current of the pixel unit in the fingerprint identification area is collected through the current sampling module.
In an embodiment of the present invention, as shown in fig. 6, the pixel unit may include a driving transistor DTFT and a light emitting diode D1, and the driving transistor DTFT drives the light emitting diode D1 to emit light according to the gate driving voltage Vdata. Note that the light emission driving current of the pixel unit may refer to a current flowing through the driving transistor DTFT or a current flowing through the light emitting diode D1. For example, as shown in fig. 6, the current sampling module may be connected to the cathode of the light emitting diode D1, and the anode of the light emitting diode D1 is connected to the driving transistor DTFT, so that the current light emitting driving current of the pixel unit in the fingerprint identification area may be collected by the current sampling module.
Specifically, when the display panel is controlled to display the current frame picture according to the image data of the current frame picture, the gate driving voltage of the pixel unit in the fingerprint identification area, that is, the gate driving voltage Vdata of the driving transistor DTFT in fig. 6, is generated according to the image data of the current frame picture, and then after the current frame picture is displayed, the current light-emitting driving current of the pixel unit in the fingerprint identification area, that is, the current flowing through the driving transistor DTFT or the current flowing through the light-emitting diode D1, may be collected by the current sampling module.
And S4, compensating the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area. It can be understood that after determining the gray scale corresponding to the pixel unit in the fingerprint identification area according to the image data of the current frame, the reference current value corresponding to the pixel unit in the fingerprint identification area is determined according to the preset corresponding relationship, then when the pixel unit in the fingerprint identification area is controlled to display according to the image data of the current frame, the gate driving voltage of the pixel unit in the fingerprint identification area is generated, and the pixel unit in the fingerprint identification area generates the light-emitting driving current according to the received gate driving voltage, so that the current light-emitting driving current of the pixel unit in the fingerprint identification area is collected through the current sampling module, and the pixel unit in the fingerprint identification area is compensated according to the current light-emitting driving current corresponding to the pixel unit in the fingerprint identification area and the reference current value. Therefore, by collecting the current light-emitting driving current of the pixel units in the fingerprint identification area and compensating the pixel units in the fingerprint identification area according to the difference value between the current light-emitting driving current of the pixel units in the fingerprint identification area and the reference current value, the design and production cost of the DDIC can be controlled, and meanwhile, the service life attenuation caused by local highlight display of the fingerprint identification area can be effectively compensated.
In the embodiment of the present invention, as shown in fig. 3, compensating the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area further includes the following steps:
and S40, acquiring a current difference value between the current light-emitting driving current of the pixel unit and the reference current value.
In an embodiment of the present invention, the current difference between the current light-emitting driving current of the pixel unit and the reference current value may be a difference obtained by subtracting the reference current value of the pixel unit from the current light-emitting driving current of the pixel unit.
It can be understood that after the current frame is displayed, the current sampling module starts to operate, collects the current light-emitting driving current I0 of the pixel units in the fingerprint identification area, and sends the current driving current I0 to the comparator to be compared with the reference current value Iref of the pixel units in the fingerprint identification area to obtain the current difference value △ I-I0-Iref.
And S41, if the current difference is larger than the preset current threshold, compensating the pixel units in the fingerprint identification area according to the current difference.
According to an embodiment of the present invention, as shown in fig. 4, compensating the pixel unit in the fingerprint identification area according to the current difference further includes the following steps:
and S410, generating a bias voltage according to the current difference.
It is understood that the bias voltage may be generated by feeding the current difference △ I into the source driver.
S411, compensating the gate driving voltage of the pixel unit according to the bias voltage, so that the pixel unit generates a light emitting driving current according to the compensated gate driving voltage.
It can be understood that after the fingerprint unlocking is performed through the display panel, the image data of the current frame picture is obtained, the gray scale corresponding to the pixel unit in the fingerprint identification area is determined according to the image data of the current frame picture, the reference current value corresponding to the pixel unit in the fingerprint identification area is determined according to the preset corresponding relation, then the pixel unit in the fingerprint identification area is controlled to display according to the image data of the current frame picture, the grid driving voltage of the pixel unit in the fingerprint identification area is generated according to the image data of the current frame picture, the pixel unit in the fingerprint identification area generates the corresponding light-emitting driving current according to the received grid driving voltage, after the current frame picture is displayed, the current sampling module starts to work, the current light-emitting driving current of the pixel unit in the fingerprint identification area is collected, and the current driving current is sent to the comparator to be compared with the reference current value of the pixel unit in the fingerprint identification area to obtain the current difference value, if the current difference is larger than the preset current threshold, generating a bias voltage according to the current difference, compensating the gate drive voltage of the pixel unit in the fingerprint identification area according to the bias voltage, and generating a light-emitting drive current by the pixel unit in the fingerprint identification area according to the compensated gate drive voltage, so that the life attenuation of the fingerprint identification area in the display panel can be effectively compensated, and the problem that the color and the brightness of the area are inconsistent with other positions due to the life attenuation is solved.
According to one embodiment of the invention, if the difference value is less than or equal to the preset threshold value, the compensation of the pixel units in the fingerprint identification area is stopped until the next fingerprint unlocking.
It can be understood that, in the process of compensating the pixel unit in the fingerprint identification area of the current frame picture, if it is detected that the current difference value between the current light-emitting driving current and the reference current value of the pixel unit in the fingerprint identification area is less than or equal to the preset threshold value, the compensation of the pixel unit in the fingerprint identification area is stopped, that is, the pixel unit in the fingerprint identification area is not compensated by other frame pictures behind the current frame picture, until the next fingerprint unlocking through the display panel, the current difference value between the current light-emitting driving current and the reference current value of the pixel unit in the fingerprint identification area is judged again, and whether the pixel unit is compensated or not is determined, so that the power consumption can be effectively saved.
It should be understood that in some embodiments of the present invention, the fingerprint identification area of the display panel may include a plurality of pixels, for example, the fingerprint identification area includes P rows and Q columns of pixel cells. Therefore, when the pixel is actually displayed, compensation can be carried out on each pixel unit in the P rows and Q columns of pixel units in the fingerprint identification area. The manner in which each of the P rows and Q columns of pixel cells within the fingerprint identification area is compensated is described in detail below.
It can be understood that the display panel is controlled to display line by line according to the image data of the current frame picture, wherein, when each line displays, the gate driving voltage of the corresponding pixel line is generated according to the image data of the current frame picture, so that the pixel units in the corresponding pixel line generate the light-emitting driving current according to the received gate driving voltage. Then, when any pixel row in the fingerprint identification area is displayed, the current light-emitting driving current of each pixel unit in the pixel row in the fingerprint identification area can be collected through the current sampling module, and each pixel unit in the pixel row is compensated according to the current light-emitting driving current and the reference current value of each pixel unit in the pixel row in the fingerprint identification area, so that each pixel unit in the P rows and Q columns of pixel units in the fingerprint identification area can be compensated.
Specifically, according to a first pixel row example in the fingerprint identification area, after Q gray scales respectively corresponding to Q pixel units in a first pixel row in the fingerprint identification area are determined according to the image data of the current frame picture, Q reference current values respectively corresponding to Q pixel units in the first pixel row in the fingerprint identification area are determined according to a preset corresponding relation, then when the first pixel row in the fingerprint identification area is controlled to display according to the image data of the current frame picture, gate driving voltages of the Q pixel units in the first pixel row are respectively and correspondingly generated, and each pixel unit in the pixel row generates a corresponding light-emitting driving current according to the received corresponding gate driving voltage. At this time, Q current light-emitting driving currents respectively corresponding to the Q pixel units in the first pixel row can be collected, and finally, each pixel unit in the first pixel row is compensated according to the current light-emitting driving current and the reference current value corresponding to each pixel unit in the first pixel row in the fingerprint identification area.
The specific compensation mode is that a current difference value between the current light-emitting driving current and a reference current value of each pixel unit is obtained, when the current difference value is larger than a preset current threshold value, a bias voltage is generated according to the current difference value, and the gate driving voltage of the corresponding pixel unit is compensated according to the bias voltage, so that each pixel unit in the first pixel row in the fingerprint identification area generates the light-emitting driving current according to the compensated gate driving voltage.
After the first pixel row is displayed, the other pixel rows are displayed line by line according to the sequence, such as the second row, the third row, the fourth row, and the like, and the specific compensation process for the pixel units of the other pixel rows is the same as that of the first pixel row, which is not described herein again.
Therefore, by collecting the current light-emitting driving current of each pixel unit in the fingerprint identification area and compensating the corresponding pixel unit according to the difference value between the current light-emitting driving current of each pixel unit and the reference current value, the design and production cost of the DDIC can be controlled, and meanwhile, the service life attenuation caused by local highlight display of the fingerprint identification area can be effectively compensated.
It should be noted that, since the fingerprint identification area may include P rows and Q columns of pixel units, the current sampling module may include Q current sensors, where the Q current sensors are respectively connected to the Q pixel units in each pixel row, and correspondingly detect the current light-emitting driving currents of the Q pixel units in the pixel row when any pixel row in the fingerprint identification area performs displaying.
In addition, for a fingerprint identification area comprising P rows and Q columns of pixel units, the current sampling module can further comprise Q/2 current sensors, the Q/2 current sensors are respectively connected with Q/2 of the Q pixel units in each pixel row at intervals, and the current light-emitting driving current of the Q/2 pixel units in the pixel row is correspondingly detected when any pixel row in the fingerprint identification area is displayed. For example, the first pixel unit in the first row and the first column, i.e. the first pixel unit in the first pixel row, is correspondingly connected with the first current sensor, the second pixel unit in the first row and the second column, i.e. the first pixel row, is not connected with the current sensor, the third pixel unit in the first row and the third column, i.e. the third pixel unit in the first pixel row, is correspondingly connected with the second current sensor, the fourth pixel unit in the first row and the fourth column, i.e. the fourth pixel unit in the first pixel row, is not connected with the current sensor, and so on. The pixel units in the rest pixel rows are connected with the current sensors in the same way as the first pixel row, so that the cost can be reduced, and the sampling difficulty can be reduced.
When the current sampling module includes Q/2 current sensors, the light emitting driving current of the pixel unit not connected with the current sensor may be determined according to the light emitting driving current of the adjacent pixel unit connected with the current sensor, for example, the light emitting driving current of the second pixel unit in the first pixel row may be determined according to the light emitting driving current of the first pixel unit and/or the third pixel unit in the first pixel row.
It should be noted that, because image information needs to be acquired in advance and a current reference value needs to be calculated, the embodiment of the present invention is applicable to a DDIC with a RAM and operating in a Command mode, because the DDIC can first send the image information to the RAM for processing in the Command mode and calculate the current reference value in the process, so that real-time compensation becomes possible.
In summary, according to the compensation method for the display panel provided by the embodiment of the invention, after the fingerprint unlocking is performed through the display panel, the image data of the current frame picture is acquired, the fingerprint identification area is determined, then the reference current value corresponding to the pixel unit in the fingerprint identification area is acquired according to the image data of the current frame picture, the display panel is controlled to display the current frame picture according to the image data of the current frame picture, the current light-emitting driving current of the pixel unit in the fingerprint identification area is detected, and finally, the pixel unit in the fingerprint identification area is compensated according to the current light-emitting driving current corresponding to the pixel unit in the fingerprint identification area and the reference current value. Therefore, the compensation method of the display panel provided by the embodiment of the invention can effectively compensate the life attenuation caused by highlight display of the fingerprint identification area, further solve the problem that the color and brightness of the area are inconsistent with other positions due to the life attenuation of the fingerprint identification area, keep the display uniformity after long-term use and effectively save the cost.
Based on the compensation method of the display panel in the above embodiment, an embodiment of the present invention further provides a display panel, fig. 5 is a schematic block diagram of the display panel according to the embodiment of the present invention, and as shown in fig. 5, the display panel according to the embodiment of the present invention includes: a control module 10, a current detection module 20, and a compensation module 30.
The control module 10 is configured to, after performing fingerprint unlocking through the display panel, acquire image data of a current frame picture, determine a fingerprint identification area, and acquire a reference current value corresponding to a pixel unit in the fingerprint identification area according to the image data of the current frame picture, and the control module 10 is further configured to control the display panel to display the current frame picture according to the image data of the current frame picture; the current detection module 20 is used for detecting the current light-emitting driving current of the pixel units in the fingerprint identification area; the compensation module 30 is configured to compensate the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area.
It can be understood that as shown in fig. 6, the current detection module 20 detects the current light-emitting driving current I0 of the light-emitting diode D1 in the pixel unit in the fingerprint identification area, and sends the current light-emitting driving current I0 to the comparator a, and compares the current light-emitting driving current I0 with the reference current value Iref of the pixel unit in the fingerprint identification area stored in the RAM, which is acquired by the control module 10, to obtain the current difference value △ I between the current light-emitting driving current I0 and the reference current value Iref of the pixel unit in the fingerprint identification area, and then the compensation module 30 compensates the pixel unit in the fingerprint identification area according to the current difference value △ I — I0 — Iref, so that the life attenuation of the fingerprint identification area in the display panel can be effectively compensated, and the problem that the color and brightness of the area are inconsistent with other positions due to the life attenuation.
According to an embodiment of the present invention, the control module 10 is further configured to determine gray scales corresponding to the pixel units in the fingerprint identification area according to the image data of the current frame picture, and respectively determine the reference current values corresponding to the pixel units in the fingerprint identification area according to the gray scales corresponding to the pixel units in the fingerprint identification area through a preset corresponding relationship, where the preset corresponding relationship is used to indicate a corresponding relationship between the gray scales and the reference current values.
According to an embodiment of the present invention, the compensation module 30 is configured to obtain a current difference between a current light-emitting driving current of the pixel unit and a reference current value, and compensate the pixel unit in the fingerprint identification area according to the current difference when the current difference is greater than a preset current threshold.
Further, according to an embodiment of the present invention, the compensation module 30 is configured to generate a bias voltage according to the current difference, and compensate the gate driving voltage of the pixel unit according to the bias voltage, so that the pixel unit generates the light emitting driving current according to the compensated gate driving voltage.
Further, according to an embodiment of the present invention, the compensation module 30 is configured to stop compensating the pixel unit until the next fingerprint unlocking when the difference is smaller than or equal to the preset threshold.
It should be noted that the foregoing explanation of the embodiment of the compensation method for a display panel is also applicable to the display panel of this embodiment, and is not repeated herein.
In summary, according to the display panel provided in the embodiment of the present invention, after the fingerprint unlocking is performed, the control module first obtains the image data of the current frame picture, and determines the fingerprint identification area, and respectively obtains the reference current values corresponding to the pixel units in the fingerprint identification area according to the image data of the current frame picture, and at the same time, the display panel is controlled to display the current frame picture according to the image data of the current frame picture, then the current light-emitting driving current of the pixel units in the fingerprint identification area is detected by the current detection module, and finally, the compensation module compensates the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area. Therefore, the display panel provided by the embodiment of the invention can effectively compensate the life attenuation caused by highlight display of the fingerprint identification area, further solve the problem that the color and brightness of the area are inconsistent with other positions due to the life attenuation of the fingerprint identification area, keep the display uniformity after long-term use and effectively save the cost.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A compensation method for a display panel, comprising:
after fingerprint unlocking is carried out through the display panel, image data of a current frame picture is obtained, and a fingerprint identification area is determined, wherein the fingerprint identification area comprises P rows and Q columns of pixel units, and P and Q are positive integers larger than 1 respectively;
acquiring a reference current value corresponding to a pixel unit in the fingerprint identification area according to the image data of the current frame picture;
controlling the display panel to display the current frame image according to the image data of the current frame image, and detecting the current light-emitting driving current of the pixel units in the fingerprint identification area, wherein when any pixel row in the fingerprint identification area displays, the current light-emitting driving current of Q/2 pixel units in the pixel row is correspondingly detected by utilizing Q/2 current sensors which are correspondingly connected with Q/2 pixel units in the pixel row at intervals, and the current light-emitting driving current of the pixel unit which is not connected with a current sensor is determined according to the current light-emitting driving current of the pixel unit which is adjacent and connected with the current sensor;
and compensating the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area.
2. The compensation method for the display panel according to claim 1, wherein obtaining the reference current values corresponding to the pixel units in the fingerprint identification area according to the image data of the current frame picture comprises:
determining the gray scale corresponding to the pixel unit in the fingerprint identification area according to the image data of the current frame picture;
and determining a reference current value corresponding to the pixel unit in the fingerprint identification area through a preset corresponding relation according to the gray scale corresponding to the pixel unit in the fingerprint identification area, wherein the preset corresponding relation is used for indicating the corresponding relation between the gray scale and the reference current value.
3. The compensation method for the display panel according to claim 1, wherein the compensating for the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area comprises:
acquiring a current difference value between the current light-emitting driving current and a reference current value of the pixel unit;
and if the current difference is larger than a preset current threshold, compensating the pixel units in the fingerprint identification area according to the current difference.
4. The compensation method for the display panel according to claim 3, wherein the compensating the pixel unit in the fingerprint identification area according to the current difference value comprises:
generating a bias voltage according to the current difference;
and compensating the gate driving voltage of the pixel unit according to the bias voltage so that the pixel unit generates a light-emitting driving current according to the compensated gate driving voltage.
5. The compensation method for a display panel according to claim 3, further comprising:
and if the difference value is smaller than or equal to a preset threshold value, stopping compensating the pixel units in the fingerprint identification area until next fingerprint unlocking.
6. A display panel, comprising:
the control module is used for acquiring image data of a current frame picture after fingerprint unlocking is carried out through the display panel, and determining a fingerprint identification area, wherein the fingerprint identification area comprises P rows and Q columns of pixel units, P and Q are positive integers which are larger than 1 respectively, and acquiring a reference current value corresponding to the pixel units in the fingerprint identification area according to the image data of the current frame picture, and the control module is also used for controlling the display panel to display the current frame picture according to the image data of the current frame picture;
the current detection module is used for detecting the current light-emitting driving current of the pixel units in the fingerprint identification area, wherein when any pixel row in the fingerprint identification area displays, the current light-emitting driving current of Q/2 pixel units in the pixel row is correspondingly detected by utilizing Q/2 current sensors which are respectively and correspondingly connected with Q/2 pixel units in the pixel row at intervals, and the current light-emitting driving current of the pixel unit which is not connected with a current sensor is determined according to the current light-emitting driving current of the adjacent pixel unit which is connected with the current sensor;
and the compensation module is used for compensating the pixel units in the fingerprint identification area according to the current light-emitting driving current and the reference current value corresponding to the pixel units in the fingerprint identification area.
7. The display panel according to claim 6, wherein the control module is further configured to determine a gray scale corresponding to the pixel unit in the fingerprint identification area according to the image data of the current frame, and determine a reference current value corresponding to the pixel unit in the fingerprint identification area according to the gray scale corresponding to the pixel unit in the fingerprint identification area through a preset correspondence relationship, wherein the preset correspondence relationship is used for indicating a correspondence relationship between the gray scale and the reference current value.
8. The display panel according to claim 6, wherein the compensation module is configured to obtain a current difference between a current light-emitting driving current of the pixel unit and a reference current value, and compensate the pixel unit in the fingerprint identification area according to the current difference when the current difference is greater than a preset current threshold.
9. The display panel according to claim 8, wherein the compensation module is configured to generate a bias voltage according to the current difference, and compensate the gate driving voltage of the pixel unit according to the bias voltage, so that the pixel unit generates a light emitting driving current according to the compensated gate driving voltage.
10. The display panel according to claim 8, wherein the compensation module is configured to stop compensating the pixel units in the fingerprint identification area until the next fingerprint unlocking when the difference is smaller than or equal to a preset threshold.
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| CN110085182A (en) * | 2019-04-17 | 2019-08-02 | 深圳市华星光电技术有限公司 | Pixel charging method and display device |
| CN110188698B (en) * | 2019-05-31 | 2021-05-14 | Oppo广东移动通信有限公司 | Fingerprint identification control method and device and computer readable storage medium |
| CN110310597A (en) * | 2019-06-27 | 2019-10-08 | 云谷（固安）科技有限公司 | A kind of display equipment and display methods |
| CN110689849B (en) * | 2019-11-08 | 2021-03-02 | 京东方科技集团股份有限公司 | Display panel, driving method thereof and display device |
| CN111142293B (en) * | 2019-12-27 | 2022-03-11 | 维沃移动通信有限公司 | Electronic device, control method thereof, and computer-readable storage medium |
| CN112511716B (en) * | 2020-11-17 | 2023-06-30 | Oppo广东移动通信有限公司 | Image display method, DDIC chip, AP, display screen module and terminal |
| CN112562565B (en) * | 2020-12-07 | 2023-06-20 | 北京集创北方科技股份有限公司 | Driving device and method, display panel and electronic equipment |
| CN114120906A (en) * | 2021-11-18 | 2022-03-01 | 广州国显科技有限公司 | Brightness compensation method and compensation device of display panel and electronic equipment |
| CN114420031B (en) * | 2022-01-30 | 2023-12-26 | 京东方科技集团股份有限公司 | Display panel and driving method thereof |
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| CN105096824B (en) * | 2015-08-06 | 2017-08-11 | 青岛海信电器股份有限公司 | Self-emitting display gray level compensation method, device and self-emitting display device |
| KR102419876B1 (en) * | 2015-08-21 | 2022-07-12 | 삼성디스플레이 주식회사 | Method of compensatting degradation and display device performing the same |
| CN105702176B (en) * | 2016-04-12 | 2018-06-15 | 深圳市华星光电技术有限公司 | Display panel and display device with fingerprint recognition |
| CN108399890B (en) * | 2018-05-30 | 2020-08-18 | 上海天马有机发光显示技术有限公司 | Organic light-emitting display panel, driving method thereof and organic light-emitting display device |
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