CN111145691A - Driving method and device of display panel - Google Patents

Driving method and device of display panel Download PDF

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Publication number
CN111145691A
CN111145691A CN202010062014.1A CN202010062014A CN111145691A CN 111145691 A CN111145691 A CN 111145691A CN 202010062014 A CN202010062014 A CN 202010062014A CN 111145691 A CN111145691 A CN 111145691A
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China
Prior art keywords
sub
display
display area
gate
duration
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Granted
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CN202010062014.1A
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Chinese (zh)
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CN111145691B (en
Inventor
谢恩明
冯雪欢
何敏
韦晓龙
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Priority to CN202010062014.1A priority Critical patent/CN111145691B/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen

Abstract

The invention discloses a driving method and a device of a display panel, wherein the display panel comprises a display area and a binding area, and the display area comprises a plurality of sub-pixels and a plurality of first grid lines; one row of sub-pixels corresponds to one first grid line; the sub-pixel comprises a light-emitting device and a light-emitting control transistor, the grid electrode of the light-emitting control transistor is electrically connected with the corresponding first grid line, the first electrode of the light-emitting control transistor is electrically connected with the anode of the light-emitting device, and the second electrode of the light-emitting control transistor is electrically connected with the reference voltage signal end. In one frame time, along the direction that the sub-display areas point to the binding areas, the duration of the grid opening signal of the first grid line in each sub-display area is controlled to change in sequence, namely along the direction that the sub-display areas point to the binding areas, so that the time that sub-pixels in each sub-display area do not emit light changes in sequence. Therefore, in one frame, the brightness of each sub-display area is basically the same, and the brightness of the display panel is uniform.

Description

Driving method and device of display panel
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for driving a display panel.
Background
Organic Light Emitting Diode (OLED) display panels have the characteristics of flexibility, high contrast, low power consumption, and the like, and have attracted wide attention. The presence of IR drop in the OLED display panel causes the OLED panel to have a problem of non-uniform emission brightness. Further, as the panel size increases, the unevenness of the light emission luminance due to the IR drop becomes more conspicuous.
Disclosure of Invention
The embodiment of the invention provides a driving method of a display panel, which can improve the uneven brightness of the display panel caused by IR drop.
Therefore, an embodiment of the present invention further provides a driving method of a display panel, where the display panel includes a display area and a bonding area, and the display area includes a plurality of sub-pixels and a plurality of first gate lines; one row of sub-pixels corresponds to one first grid line; the sub-pixels comprise light emitting devices and light emitting control transistors, the grid electrodes of the light emitting control transistors are electrically connected with the corresponding first grid lines, the first electrodes of the light emitting control transistors are electrically connected with the anodes of the light emitting devices, and the second electrodes of the light emitting control transistors are electrically connected with a reference voltage signal end;
dividing the display area into a plurality of sub-display areas, wherein each sub-display area comprises at least one first grid line;
the driving method includes:
and controlling the duration of the gate opening signal of the first gate line in each sub-display area to be sequentially changed according to the duration of the pre-stored gate opening signal along the direction of the sub-display area pointing to the binding area within one frame time, so that the lighting time of the sub-pixels in each sub-display area is sequentially changed.
Optionally, the sub-display region includes at least two first gate lines; and the duration time of the grid opening signal of the first grid line in the same sub-display area is the same.
Further, the duration of the pre-stored gate-on signal includes a first duration, one of the sub-display regions corresponds to one of the first durations, and the method for determining the first duration includes:
for each sub-display area, adjusting the duration of a grid electrode opening signal of a first grid line in the sub-display area to enable the brightness of each sub-display area to be the same as a first preset reference brightness;
and storing the adjusted duration time of the grid opening signal of the first grid line in the sub-display area as the first duration time.
Further, the method for determining the first preset reference brightness includes:
for each sub-display area, selecting the same duration time of a grid opening signal of a first grid line to enable each sub-display area to emit light;
respectively measuring the brightness of each sub-display area;
and determining one of the luminances of all the sub-display regions as the first preset reference luminance.
Optionally, the sub-display region includes one first gate line.
Further, the display area is divided into a plurality of detection display areas, and each detection display area comprises at least two first grid lines;
the duration of the pre-stored gate-on signal comprises a second duration, one of the sub-display regions corresponds to one of the second durations, and the method for determining the second duration comprises the following steps:
for each detection display area, adjusting the duration time of a grid electrode opening signal of a first grid line in the detection display area to enable the brightness of each detection display area to be the same as a second preset reference brightness;
and storing the adjusted duration of the gate-on signal of each first gate line as the second duration.
Further, the method for determining the second preset reference brightness includes:
for each first grid line, selecting the same duration time of the grid opening signal of the first grid line so as to enable each detection display area to emit light;
respectively measuring the brightness of the detection display areas;
and determining one of the brightness of the detection display area as the second preset reference brightness.
Further, the difference value between the duration time of the gate turn-on signals corresponding to every two adjacent sub-display areas is the same.
Correspondingly, the embodiment of the invention also provides a driving device of a display panel, wherein the display panel comprises a display area and a binding area, and the display area comprises a plurality of sub-pixels and a plurality of first grid lines; one row of sub-pixels corresponds to one first grid line; the sub-pixels comprise light emitting devices and light emitting control transistors, the grid electrodes of the light emitting control transistors are electrically connected with the corresponding first grid lines, the first electrodes of the light emitting control transistors are electrically connected with the anodes of the light emitting devices, and the second electrodes of the light emitting control transistors are electrically connected with a reference voltage signal end;
dividing the display area into a plurality of sub-display areas, wherein each sub-display area comprises at least one first grid line;
the driving device is used for controlling the duration time of the grid opening signal of the first grid line in each sub-display area to change in sequence along the direction of the sub-display area pointing to the binding area within one frame time according to the duration time of the grid opening signal stored in advance, so that the lighting time of the sub-pixels in each sub-display area changes in sequence.
Correspondingly, the embodiment of the invention also provides a display device which comprises a display panel and a driving device of the display panel.
Accordingly, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, realizes the steps of the above-mentioned driving method provided by the embodiment of the present invention.
Correspondingly, the embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the driving method provided by the embodiment of the present invention are implemented.
The invention has the following beneficial effects:
the embodiment of the invention provides a driving method and a device of a display panel, wherein the display panel comprises a display area and a binding area, and the display area comprises a plurality of sub-pixels and a plurality of first grid lines; one row of sub-pixels corresponds to one first grid line; the sub-pixel comprises a light-emitting device and a light-emitting control transistor, the grid electrode of the light-emitting control transistor is electrically connected with the corresponding first grid line, the first electrode of the light-emitting control transistor is electrically connected with the anode of the light-emitting device, and the second electrode of the light-emitting control transistor is electrically connected with the reference voltage signal end. In one frame time, along the direction that the sub-display areas point to the binding areas, the duration of the grid opening signal of the first grid line in each sub-display area is controlled to change in sequence, namely along the direction that the sub-display areas point to the binding areas, so that the time that sub-pixels in each sub-display area do not emit light changes in sequence. Therefore, in one frame, the brightness of each sub-display area is basically the same, and the brightness of the display panel is uniform.
Drawings
Fig. 1 is a schematic diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a display area in a display panel according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a sub-pixel according to an embodiment of the present invention;
FIG. 4 is a timing diagram of a signal provided by an embodiment of the present invention;
FIG. 5 is a timing diagram of another embodiment of the present invention;
FIG. 6 is a timing diagram of another embodiment of the present invention;
FIG. 7 is a schematic diagram of a display area of a display panel according to another embodiment of the present invention;
FIG. 8 is a timing diagram of another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
As shown in fig. 1, the display panel has a display area a1, a Fan-out area (Fan out) a2, and a bonding area B. The display area A1 is provided with a signal line, the fan-out line is arranged in the fan-out area A2, the binding area B is provided with a binding terminal, and the binding terminal is bound with the flexible circuit board, so that signals transmitted by the flexible circuit board sequentially pass through the binding terminal and the fan-out line and are input to the signal line.
Also, the display area a1 of the display panel includes a plurality of sub-pixels and power supply lines. Each sub-pixel is usually electrically connected to a power line through a binding terminal and a fan-out line to provide a power voltage required for the sub-pixel to emit light through the power line. In practical applications, the power line is connected to the binding terminals in the binding region to supply a power voltage to the binding terminals through an external circuit, thereby supplying the power voltage to the power line.
However, for the sub-pixels close to the binding region B, the resistance of the power line electrically connected thereto is smaller than that of the power line electrically connected to the sub-pixels far from the binding region B, and the power voltage supplied to the sub-pixels close to the binding region B is larger than that supplied to the sub-pixels far from the binding region B, resulting in a higher intensity of light emission of the sub-pixels close to the binding region B and a lower intensity of light emission of the sub-pixels far from the binding region B. Therefore, IR drop occurs, which causes the brightness of the sub-pixels to be uneven, and thus affects the display effect.
An embodiment of the present invention provides a display panel, as shown in fig. 1 and fig. 2, the display panel includes a display area a1 and a bonding area B, where the display area a1 may include a plurality of sub-pixels P, a plurality of first gate lines Scan1, and a plurality of second gate lines Scan 2; a row of sub-pixels P corresponds to one first gate line Scan1 and one second gate line Scan 2. Also, as shown in fig. 3, the sub-pixel P may include: a light emitting device O, a light emission control transistor T1, a data writing transistor T2, a storage capacitor C, and a driving transistor DT. The gate of the light emission control transistor T1 is electrically connected to the corresponding first gate line Scan1, the first electrode of the light emission control transistor T1 is electrically connected to the anode of the light emitting device O, and the second electrode of the light emission control transistor T1 is electrically connected to the reference voltage signal terminal Vref. A first pole of the Data writing transistor T2 is electrically connected to the Data signal terminal Data, a control terminal of the Data writing transistor T2 is electrically connected to the second gate line Scan2, and a second pole of the Data writing transistor T2 is electrically connected to the gate electrode of the driving transistor DT. A first electrode of the driving transistor DT is electrically connected to the first power source terminal VDD, and a second electrode of the driving transistor DT is electrically connected to an anode of the light emitting device O. The first pole of the storage capacitor C is electrically connected to the gate electrode of the driving transistor DT, and the second pole of the storage capacitor C is electrically connected to the second pole of the driving transistor DT. The cathode of the light emitting device is electrically connected to a second power source terminal VSS. In the implementation, for other necessary circuit structures in the sub-pixel P besides the light emitting control transistor T1 and the light emitting device O, a person skilled in the art can specifically design and determine according to the practical application environment.
In a specific implementation, the display panel provided by the embodiment of the invention may be an OLED display panel.
In a specific implementation, when a voltage difference between an anode voltage and a cathode voltage of the light emitting device O is greater than the light emission start voltage, the light emitting device O emits light, and when the voltage difference between the anode voltage and the cathode voltage of the light emitting device O is less than the light emission start voltage, the light emitting device O does not emit light. The voltage difference between the voltage of the reference voltage signal terminal Vref and the cathode voltage of the light emitting device O may be made smaller than the light emission start voltage, and when the reference voltage signal terminal Vref is turned on with the anode of the light emitting device O, the light emitting device O may be made not to emit light. In specific implementation, the gate-on signal is a signal that is input to the first gate line Scan1 and turns on the light emitting control transistor T1 electrically connected to the first gate line Scan 1. Correspondingly, the gate-off signal is a signal which is input to the first gate line Scan1 and can turn off the light emission control transistor T1 electrically connected to the first gate line Scan 1. Further, when the gate-on signal is inputted to the second gate line Scan2, the data writing transistor T2 may be turned on, and when the gate-off signal is inputted to the second gate line Scan2, the data writing transistor T2 may be turned off, specifically, as shown in fig. 3, the light emission controlling transistor T1 may be an N-type transistor, the gate-on signal may be a high level signal, and the gate-off signal may be a low level signal. Alternatively, the light emission controlling transistor T1 may be a P-type transistor, and the gate-on signal may be a low level signal and the gate-off signal may be a high level signal.
Specifically, in the sub-pixel P provided in the embodiment of the present invention, the Transistor may be a Thin Film Transistor (TFT) or a Metal oxide semiconductor field effect Transistor (MOS), which is not limited herein. Depending on the type of the transistor and the signal of the control electrode of the transistor, the control electrode of the transistor may be used as the gate, the first electrode of the transistor may be used as the source, and the second electrode may be used as the drain, or the first electrode of the transistor may be used as the drain and the second electrode may be used as the source, which are not specifically distinguished herein.
When the display panel is controlled to emit light, the gate-on signals on each first gate line may be maintained at the same time, the gate-on signals on each second gate line Scan2 may be maintained at the same time, and the voltages of the data signals corresponding to each sub-pixel may be the same. This allows all the sub-pixels P in each sub-display section to be loaded with the same data signal. Due to the IR drop in the display panel, the light intensity of the light emitted from the sub-pixels P in each sub-display region gradually increases in the direction pointing to the binding region B along the sub-display region, so that the brightness of each sub-display region also gradually increases, and the brightness is not uniform.
Therefore, the embodiment of the present invention provides a driving method of a display panel, which divides the display area a1 into a plurality of sub-display areas L-X (1< X, where X is the total number of the sub-display areas, and X are integers), each of the sub-display areas L-X includes at least one first gate line Scan 1;
furthermore, the driving method of the display panel provided by the embodiment of the present invention may include:
and controlling the duration of the gate-on signal of the first gate line Scan1 in each sub-display region L-x to be sequentially changed according to the duration of the pre-stored gate-on signal along the direction that the sub-display region L-x points to the binding region B within one frame time, so that the lighting time of the sub-pixels P in each sub-display region L-x is sequentially changed.
In the driving method of the display panel provided in the embodiment of the present invention, in one frame time, along the direction in which the sub-display regions point to the binding region, the duration of the gate-on signal of the first gate line in each sub-display region is controlled to sequentially change, that is, along the direction in which the sub-display regions point to the binding region, so that the time in which the sub-pixels in each sub-display region do not emit light sequentially changes. Therefore, in one frame, the brightness of each sub-display area is basically the same, and the brightness of the display panel is uniform.
In specific implementation, the controlling the duration of the gate-on signal of the first gate line Scan1 in each sub-display region L-x to sequentially change the lighting time of the sub-pixels P in each sub-display region L-x may include: the duration of the gate-on signal controlling the first gate line Scan1 in each sub-display region L-x is sequentially increased to sequentially decrease the lighting time of the sub-pixels P in each sub-display region L-x, so that the brightness of each sub-display region L-x in one frame display time is the same.
In practical implementation, as shown in fig. 2, the sub-display region L-x may include at least two first gate lines Scan1, and the durations of the gate-on signals of the first gate lines Scan1 in the same sub-display region L-x may also be the same. Illustratively, as shown in fig. 2, the display area in the display panel is divided into 8 sub-display areas (X ═ 8), and the first sub-display area L-1 to the eighth sub-display area L-8 are sequentially arranged along a direction in which the sub-display area L-X points to the bonding area B, each sub-display area includes N first gate lines (N is a positive integer greater than 1, and N ═ 2 is taken as an example in fig. 2), and N second gate lines. Each of the first to eighth sub-display regions L-1 to L-8 includes two first gate lines Scan 1. Also, as shown in fig. 4, the duration of the gate-on signals of the two first gate lines Scan1 in the same sub-display region is the same during one frame time T. The duration of the gate-on signals of different sub-display regions are different. For example, the gate-on signals of the signal S1 corresponding to the first gate line and the signal S2 corresponding to the second gate line in the first sub-display region L-1 are all maintained for tL 1. The gate-on signal of the signal S3 corresponding to the first gate line and the signal S4 corresponding to the second gate line in the second sub-display region L-2 are both tL 2. The gate-on signal holding time of the signal S5 corresponding to the first gate line and the signal S6 corresponding to the second gate line in the third sub-display region L-3 are tL3, and the rest of the same is not described herein. Also, tL1< tL2< tL3< tL4< tL5< tL6< tL7< tL 8.
Further, in practical implementation, the difference between the durations of the gate-on signals corresponding to each two adjacent sub-display regions L-x may also be made the same.
The driving method provided by the embodiment of the present invention will be described below by taking fig. 2 to 6 as an example.
Controlling the duration of the gate-on signal of the first gate line in each sub-display region to sequentially increase according to the pre-stored duration of the gate-on signal, which may specifically include: as shown in fig. 4, during the display time T of one frame, the signal S1 is applied to the first gate line Scan1 in the first sub-display region L-1, the signal S2 is applied to the second gate line Scan1 in the first sub-display region L-1, the signal S3 … … is applied to the first gate line Scan1 in the second sub-display region L-2, the signal S16 is applied to the second gate line Scan1 in the eighth sub-display region L-8, and in the signals S1 to S16, the high level signal is the gate-on signal and the low level signal is the gate-off signal.
As shown in fig. 5, during one frame display time, a signal Q1 is applied to the first second gate line Scan2 in the first sub-display region L-1, a signal Q2 is applied to the second gate line Scan2 in the first sub-display region L-1, a signal Q3 is applied to the first second gate line Scan1 in the second sub-display region L-2, and a signal Q4 is applied to the second gate line Scan1 in the second sub-display region L-2. And, the duration of loading the high level signal to each of the second gate lines Scan2 is t. Illustratively, t ≦ tL 1. Of course, in practical applications, t may be designed and determined according to practical application environments, which are not described herein.
The following describes a process of lighting up a sub-pixel by taking one sub-pixel P in the first sub-display region L-1 as an example.
As shown in fig. 6, during the gate-on signal duration tL1, the first gate line Scan1 and the second gate line Scan2 electrically connected to the subpixel P are both applied with high level signals, that is, the control terminals of the light emission control transistor T1 and the data write transistor T2 are both applied with high level signals, so that the light emission control transistor T1 and the data write transistor T2 are both turned on. The light emission controlling transistor T1 is turned on to turn on the anode of the light emitting device O and the reference voltage signal terminal Vref, the signal of the reference voltage signal terminal Vref is maintained at a fixed voltage for the gate-on signal duration tL1, and the difference between the fixed voltage and the signal of the second power source terminal VSS is smaller than the light emission on voltage of the light emitting device O, so that the light emitting device O does not emit light. The data writing transistor T2 is turned on to supply the data signal of the data signal terminal to the gate of the driving transistor DT.
In the gate-off signal duration T-tL1, a low level signal is applied to the control terminals of the light emission controlling transistor T1 and the data writing transistor T2 to turn off both the light emission controlling transistor T1 and the data writing transistor T2, the storage capacitor stores the data signal inputted to the gate of the driving transistor, and the driving transistor generates a driving current to light the light emitting device O. The working process of the other sub-pixels P may be substantially the same as the above process, and will not be described herein. Therefore, when the gate-on signal is transmitted to the first gate line Scan1, the light emitting device does not emit light.
Since the duration of the gate-on signal of the first gate line Scan1 in the first to eighth sub-display regions L-1 to L-8 sequentially increases, that is, tL1< tL2< tL3< tL4< tL5< tL6< tL7< tL 8. Therefore, the light emitting time of the sub-pixels in the first to eighth sub-display regions L-1 to L-8 becomes short. Therefore, the sub-pixels far away from the binding region have longer light-emitting time, and the sub-pixels close to the binding region have shorter light-emitting time, so that the nonuniform light-emitting of the sub-pixels in the display panel caused by the IR drop can be improved.
In practical implementation, in an embodiment of the present invention, the pre-stored duration of the gate-on signal may include a first duration, one sub-display region L-x corresponds to the first duration, and the method for determining the first duration may include:
for each sub-display area L-x, adjusting the duration of the gate turn-on signal of the first gate line Scan1 in the sub-display area L-x to make the brightness of each sub-display area L-x the same as the first preset reference brightness;
the duration of the gate-on signal of the first gate line Scan1 in the adjusted sub-display region L-x is stored as a first duration.
In specific implementation, in this embodiment of the present invention, the method for determining the first preset reference luminance may include:
for each sub-display area L-x, selecting the same duration of the gate turn-on signal of the first gate line Scan1 to make each sub-display area L-x emit light;
respectively measuring the brightness of each sub-display area L-x;
and determining one of the luminances of all the sub-display areas L-x as a first preset reference luminance.
For example, in the process of determining the first duration, the duration of the gate-on signal of the first gate line Scan1 in each sub-display region L-x may be the same, and the light emitting devices in the sub-pixels may be driven to emit light in combination with the signal of the second gate line Scan2 and the data signals of the same voltage corresponding to the sub-pixels.
In specific implementation, one sub-display region L-x corresponds to one brightness, and one of the brightnesses of all sub-display regions L-x is determined as a first preset reference brightness, for example: the highest luminance may be determined as the first preset reference luminance. Alternatively, the lowest luminance may be determined as the first preset reference luminance. Alternatively, the middle brightness among all the brightnesses may be determined as the first preset reference brightness. Of course, the method for determining the first preset reference brightness may be determined according to the actual application environment design, and is not limited herein.
In specific implementation, the first preset reference luminance may also be determined according to the luminances of all the sub-display areas L-x, for example, an average value of the luminances of all the sub-display areas L-x may be determined as the first preset reference luminance, and of course, a determination method of the first preset reference luminance may be designed and determined according to an actual application environment, and is not limited herein.
The following describes a method for determining the first duration according to an embodiment of the present invention, taking the structure of the display panel shown in fig. 2 and the sub-pixel P shown in fig. 3 as an example.
The method for determining the first duration provided by the embodiment of the invention can comprise the following steps:
(1) selecting the gate start signal of the first gate line Scan1 with the same duration, selecting the gate start signal of the second gate line Scan2 with the same duration, and selecting the data signal with the same voltage, inputting the gate start signal to the first gate line Scan1 row by row, inputting the high level signal to the second gate line Scan2 row by row, and loading the data signal with the same voltage to all the sub-pixels P in each sub-display region L-x to control the sub-pixels in each sub-display region L to emit light.
For example, take the first sub-display region L-1 as an example. For the two first gate lines Scan1 included in the first sub-display region L-1, the durations of the gate-on signals applied to the two first gate lines Scan1 are the same during the display time T of one frame. Also, the gate-on signal of the first gate line Scan1 may be maintained for the same time period as the gate-on signal of the second gate line Scan 2. Thus, when a gate-on signal is applied to the first gate line Scan1 electrically connected to one subpixel P, a high-level signal is applied to the second gate line Scan2 electrically connected to the subpixel P at the same time, and the subpixel P does not emit light during this time.
(2) The brightness of each sub-display region is measured separately.
In practical application, the brightness of each sub-display region L-x can be measured by using the method for measuring the brightness of the display panel in the prior art.
Due to the IR drop in the display panel, the luminous intensity of sub-pixels in the first sub-display area L-1 to the eighth sub-display area L-8 is sequentially increased, and the luminous time of each sub-display area L-x is the same, so that the brightness corresponding to the first sub-display area L-1 to the eighth sub-display area L-8 is sequentially increased.
(3) And determining the brightness corresponding to the eighth sub-display area L-8 as the first preset reference brightness.
(4) For each sub-display region, taking the first sub-display region L-1 as an example, the duration of the gate-on signal of the first gate line Scan1 in the first sub-display region L-1 is adjusted, and after the adjustment, the brightness corresponding to the adjusted first sub-display region L-1 is measured. And comparing the brightness measured after adjustment with a first preset reference brightness. If the two signals are the same, the adjusted duration of the gate-on signal of the first gate line Scan1 in the first sub-display region L-1 is stored as the first duration corresponding to the first sub-display region L-1.
If the brightness of the first sub-display region L-1 is different from the first preset reference brightness, the duration of the gate turn-on signal of the first gate line Scan1 in the first sub-display region L-1 is adjusted again, the brightness corresponding to the adjusted first sub-display region L-1 is measured, and the measured brightness after adjustment is compared with the first preset reference brightness until the measured brightness after adjustment is the same as the first preset reference brightness.
The same applies to the second sub-display region L-2 to the eighth sub-display region L-8, which is not described herein.
Therefore, each sub-display area L-x is corresponding to obtain a first duration, and eight first durations corresponding to eight sub-display areas are used as the durations of the gate-on signals stored in advance. For example, the first sub-display region L-1 corresponds to a first duration tL-1 for storing the gate-on signal, the second sub-display region L-2 corresponds to a first duration tL-2 for storing the gate-on signal, the third sub-display region L-3 corresponds to a first duration tL-3 for storing the gate-on signal, the fourth sub-display region L-4 corresponds to a first duration tL-4 for storing the gate-on signal, the fifth sub-display region L-5 corresponds to a first duration tL-5 for storing the gate-on signal, the sixth sub-display region L-6 corresponds to a first duration tL-6 for storing the gate-on signal, the seventh sub-display region L-7 corresponds to a first duration tL-7 for storing the gate-on signal, and the eighth sub-display region L-8 corresponds to a first duration tL-8 for storing the gate-on signal.
The embodiments of the present invention further provide some driving methods of a display panel, which are modified from the above embodiments. Only the differences between the present embodiment and the above embodiments will be described below, and the descriptions of the same parts will be omitted.
In specific implementation, in the embodiment of the present invention, as shown in fig. 7, the sub-display region L-x may include only one first gate line Scan 1. Further, in practical implementation, in the embodiment of the present invention, the difference between the durations of the gate-on signals corresponding to every two adjacent sub-display regions L-x may be the same. Therefore, the duration of the gate-on signals corresponding to different sub-display areas L in the display panel can be uniformly set.
The following description will be made by taking the display panel shown in fig. 7 and the sub-pixel P having the circuit configuration shown in fig. 3 as an example.
As shown in fig. 7, the display area a1 of the display panel is divided into X sub-display areas L, and each sub-display area L-X includes one first gate line Scan1 and one second gate line Scan 2. The display region a1 collectively includes X first gate lines Scan1 and X second gate lines Scan 2. For example, along the direction that the sub-display region L-X points to the binding region, the sub-display regions are sequentially the first sub-display region L-1 to the Xth sub-display region L-X.
Controlling the duration of the gate-on signal of the first gate line in each of the sub-display regions to sequentially increase according to the pre-stored duration of the gate-on signal, which may specifically include: as shown in fig. 8, during one frame display time T, a signal S1 is applied to the first gate line Scan1 in the first sub-display region L-1, and a signal S2 … … is applied to the first gate line Scan1 in the second sub-display region L-2, and a signal SX is applied to the first gate line Scan1 in the X-th sub-display region L-X. In the signals S1-SX, the high level signal is a gate-on signal. The duration of the gate-on signal of the first gate line Scan1 in the first sub-display region L-1 is tL 1; the duration of the gate-on signal of the first gate line Scan1 in the second sub-display region L-2 is tL 2; … … the duration of the gate-on signal of the first gate line Scan1 in the xth sub-display region L-X is tLX. And, the durations tL1 to tLX increase in sequence, and the difference between every two adjacent durations is the same.
As shown in fig. 8, in one frame display time, the second gate line Scan2 in the first sub-display region L-1 is loaded with the signal Q1, the second gate line Scan2 in the first sub-display region L-1 is loaded with the signal Q2 … …, and the second gate line Scan2 in the X-th sub-display region L-X is loaded with the signal QX, and the durations t of the high level signals in the signals Q1-QX may be the same.
The following describes a process of lighting up a sub-pixel by taking one sub-pixel P in the first sub-display region L-1 as an example.
During the gate-on signal duration, a high level signal is applied to both the first gate line Scan1 and the second gate line Scan2, that is, both the control terminals of the light emission control transistor T1 and the data write transistor T2 are applied with a high level signal, so that both the light emission control transistor T1 and the data write transistor T2 are turned on. The light emission controlling transistor T1 is turned on to turn on the anode of the light emitting device O and the reference voltage signal terminal Vref, the signal of the reference voltage signal terminal Vref is maintained at a fixed voltage for the duration of the gate-on signal, and the difference between the fixed voltage and the signal of the second power source terminal VSS is smaller than the light emission on voltage of the light emitting device O, so that the light emitting device O does not emit light. The data writing transistor T2 is turned on to supply the data signal of the data signal terminal to the gate of the driving transistor DT.
In the gate-off signal duration, a low level signal is applied to the control terminals of the emission control transistor T1 and the data writing transistor T2 to turn off both the emission control transistor T1 and the data writing transistor T2, the storage capacitor stores the data signal inputted to the gate of the driving transistor, and the driving transistor generates a driving current to cause the light emitting device O to emit light. The working process of the other sub-pixels P may be substantially the same as the above process, and will not be described herein. Therefore, when the gate-on signal is transmitted to the first gate line Scan1, the light emitting device does not emit light.
In a direction in which the sub-display regions L-x point to the binding region B, the durations tL1-tLX of the gate-on signals of the first gate lines Scan1 corresponding to each sub-display region sequentially increase, so that the light emitting times of the sub-pixels P in the sub-display regions L-x sequentially decrease. Therefore, the sub-pixels far away from the binding region have longer light-emitting time, and the sub-pixels close to the binding region have shorter light-emitting time, so that the nonuniform light-emitting of the sub-pixels in the display panel caused by the IR drop can be improved.
In specific implementation, in the embodiment of the present invention, the display area may be divided into a plurality of detection display areas E-K (1< K, where K is the total number of the detection display areas, and K are both integers), and each detection display area E-K includes at least two first gate lines Scan 1;
the pre-stored duration of the gate-on signal may include a second duration corresponding to one of the sub-display regions L-x, and the determining method of the second duration may include:
for each detection display area E-k, adjusting the duration of a gate turn-on signal of the first gate line Scan1 in the detection display area E-k to make the brightness of each detection display area E-k the same as the second preset reference brightness;
the adjusted duration of the gate-on signal of each of the first gate lines Scan1 is stored as a second duration.
In specific implementation, in this embodiment of the present invention, the method for determining the second preset reference luminance may include:
for each first grid line Scan1, selecting the same duration of the grid opening signal of the first grid line Scan1 to enable each detection display area E-k to emit light;
respectively measuring the brightness of each detection display area E-k;
and determining one of the brightness of each detection display area E-k as a second preset reference brightness.
In specific implementation, for each detection display area E-k, adjusting the duration of the gate-on signal of the first gate line Scan1 in the detection display area E-k to make the luminance of each detection display area E-k the same as the second preset reference luminance may specifically include:
selecting the same duration time of the gate turn-on signal for all the first gate lines Scan1 in the same detection display area E-k, so that the brightness of the detection display area E-k is the same as the second preset reference brightness; a detection display area E-k corresponds to the duration of a grid opening signal;
and determining the duration of the gate-on signal of each first gate line Scan1 by using a piecewise linear interpolation method according to the selected duration of the gate-on signal of the first gate line Scan1 corresponding to each detection display region E-k.
The following describes a method for determining the second duration according to an embodiment of the present invention, taking the structure of the display panel shown in fig. 7 and the sub-pixel P shown in fig. 3 as an example.
The display area a1 of the display panel is divided into 8 detection display areas (K is 8), which are sequentially a first detection display area E-1 to an eighth detection display area E-8 along a direction in which the sub-display area L-X points to the binding area B, each detection display area E includes N first gate lines (N is a positive integer greater than 1), and X is 8N.
The method for determining the second duration provided by the embodiment of the invention can comprise the following steps:
(1) selecting the gate start signal of the first gate line Scan1 with the same duration, selecting the gate start signal of the second gate line Scan2 with the same duration, selecting the data signal with the same voltage, inputting the gate start signal to the first gate line Scan1 line by line, inputting the high level signal to the second gate line Scan2 line by line, and loading the data signal with the same voltage to all the sub-pixels P from the first detection display area to the eighth detection display areas E-1 to E-8 to control the sub-pixels in the detection display areas E-1 to E-8 to emit light.
For example, take the first detection display area E-1 as an example. The durations of the gate-on signals applied to the first gate lines Scan1 included in the first sensing display region E-1 are the same during the display time T of one frame. Also, the gate-on signal of the first gate line Scan1 may be maintained for the same time period as the gate-on signal of the second gate line Scan 2. Thus, when a gate-on signal is applied to the first gate line Scan1 electrically connected to one subpixel P, a high-level signal is applied to the second gate line Scan2 electrically connected to the subpixel P at the same time, and the subpixel does not emit light during this time.
(2) The brightness of each of the detection display areas E-1 to E-8 is measured, respectively.
In practical application, the brightness of each detection display area E-1 to E-8 can be measured by adopting the method for measuring the brightness of the display panel in the prior art.
(3) And determining the brightness corresponding to the eighth detection display area E-8 as a second preset reference brightness.
(4) For each of the detecting display regions E-1 to E-8, taking the first detecting display region E-1 as an example, the duration of the gate-on signal of the first gate line Scan1 in the first detecting display region E-1 is adjusted, and the brightness corresponding to the adjusted first detecting display region E-1 is measured. And comparing the brightness measured after adjustment with a second preset reference brightness. If the same, the adjusted duration of the gate-on signal of the first gate line Scan1 in the detection display area E-k is stored.
If the brightness of the detected display area E-k is different from the first preset reference brightness, the duration of the gate turn-on signal of the first gate line Scan1 in the detected display area E-k is adjusted again, the brightness corresponding to the adjusted detected display area E-k is measured, and the measured brightness after adjustment is compared with the second preset reference brightness until the measured brightness after adjustment is the same as the second preset reference brightness.
(5) And determining the duration of the gate-on signal of each first gate line Scan1 by using a piecewise linear interpolation method according to the durations of the gate-on signals of the first gate lines Scan1 corresponding to all the detection display regions E-k. And, the determined duration of the gate-on signal of each of the first gate lines Scan1 is stored as the second duration of the gate-on signal of each of the first gate lines Scan 1.
For example, taking the first detection display area E-1 as an example, if the duration of the gate-on signal of the first gate line Scan1 corresponding to the first detection display area E-1 is Te1, the same value is sequentially increased from the duration of the gate-on signal of the first gate line Scan1 to the duration of the gate-on signal of the nth first gate line Scan1 in the first detection display area E-1. And, the average value of the duration of the gate-on signals of all the first gate lines Scan1 in the first detection display region E-1 is Te 1. For example, the gate-on signals of the first to nth first gate lines Scan1 to Scan1 in the first sensing display area E-1 have durations Te1-1 to Te1-N, and durations Te1-1 to Te1-N sequentially increase, and the difference between every two adjacent ones of the durations Te1-1 to Te1-N is the same.
It should be noted that the determination method of the duration of the gate-on signal of each of the first gate lines Scan1 in the second through eighth sensing display regions E-2 through E-8 may be substantially the same as that of the first sensing display region E-1, so that the duration of the gate-on signal of each of the first gate lines Scan1 in the display region a1 may be determined.
Since each sub-display region L-x includes one first gate line Scan1, the duration of the gate-on signal of each first gate line Scan1 in the determined display region a1 can be used as the second duration corresponding to each sub-display region. Illustratively, the first gate line Scan1 in the first sub-display region L-1 corresponds to the first gate line Scan1 in the first sensing display region E-1, and the duration Te1-1 may be stored as the second duration corresponding to the first sub-display region L1. The first gate line Scan1 in the second sub-display region L-2 corresponds to the second first gate line Scan1 in the first sensing display region E-1, and the duration Te1-2 can be stored as the second duration corresponding to the second sub-display region L-2. The first gate line Scan1 in the third sub-display region L-3 corresponds to the third first gate line Scan1 in the first sensing display region E-1, and the duration Te1-3 can be stored as the second duration corresponding to the third sub-display region L-3. For the same reason, the description is omitted here.
Based on the same inventive concept, embodiments of the present invention further provide a driving apparatus for a display panel, wherein the structure of the display panel can refer to the above structure, which is not described herein again.
The driving device provided by the embodiment of the invention is used for controlling the duration of the gate-on signal of the first gate line in each sub-display area to be sequentially changed according to the duration of the pre-stored gate-on signal along the direction in which the sub-display areas point to the binding area within one frame time, so that the lighting time of the sub-pixels in each sub-display area is sequentially changed.
Based on the same inventive concept, embodiments of the present invention further provide a display device, including a display panel and the driving device of the display panel, and specific implementation thereof can refer to an implementation process of the driving device of the display panel, and details of the same are omitted. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, and the program, when executed by a processor, implements the steps of any of the driving methods provided by the embodiments of the present invention. In particular, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
Based on the same inventive concept, an embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the computer device implements any of the steps of the driving method provided by the embodiment of the present invention.
The embodiment of the invention provides a driving method and a device of a display panel, wherein the display panel comprises a display area and a binding area, and the display area comprises a plurality of sub-pixels and a plurality of first grid lines; one row of sub-pixels corresponds to one first grid line; the sub-pixel comprises a light-emitting device and a light-emitting control transistor, the grid electrode of the light-emitting control transistor is electrically connected with the corresponding first grid line, the first electrode of the light-emitting control transistor is electrically connected with the anode of the light-emitting device, and the second electrode of the light-emitting control transistor is electrically connected with the reference voltage signal end. In one frame time, along the direction that the sub-display areas point to the binding areas, the duration of the grid opening signal of the first grid line in each sub-display area is controlled to change in sequence, namely along the direction that the sub-display areas point to the binding areas, so that the time that sub-pixels in each sub-display area do not emit light changes in sequence. Therefore, in one frame, the brightness of each sub-display area is basically the same, and the brightness of the display panel is uniform.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. The driving method of the display panel is characterized in that the display panel comprises a display area and a binding area, wherein the display area comprises a plurality of sub-pixels and a plurality of first grid lines; one row of sub-pixels corresponds to one first grid line; the sub-pixels comprise light emitting devices and light emitting control transistors, the grid electrodes of the light emitting control transistors are electrically connected with the corresponding first grid lines, the first electrodes of the light emitting control transistors are electrically connected with the anodes of the light emitting devices, and the second electrodes of the light emitting control transistors are electrically connected with a reference voltage signal end;
dividing the display area into a plurality of sub-display areas, wherein each sub-display area comprises at least one first grid line;
the driving method includes:
and controlling the duration of the gate opening signal of the first gate line in each sub-display area to be sequentially changed according to the duration of the pre-stored gate opening signal along the direction of the sub-display area pointing to the binding area within one frame time, so that the lighting time of the sub-pixels in each sub-display area is sequentially changed.
2. The driving method of claim 1, wherein the sub display region includes at least two of the first gate lines; and the duration time of the grid opening signal of the first grid line in the same sub-display area is the same.
3. The driving method as claimed in claim 2, wherein the pre-stored duration of the gate-on signal includes a first duration, one of the sub-display regions corresponds to one of the first durations, and the determining method of the first duration includes:
for each sub-display area, adjusting the duration of a grid electrode opening signal of a first grid line in the sub-display area to enable the brightness of each sub-display area to be the same as a first preset reference brightness;
and storing the adjusted duration time of the grid opening signal of the first grid line in the sub-display area as the first duration time.
4. The driving method according to claim 3, wherein the determination method of the first preset reference luminance includes:
for each sub-display area, selecting the same duration time of a grid opening signal of a first grid line to enable each sub-display area to emit light;
respectively measuring the brightness of each sub-display area;
and determining one of the luminances of all the sub-display regions as the first preset reference luminance.
5. The driving method of claim 1, wherein the sub display region includes one of the first gate lines.
6. The driving method according to claim 5, wherein the display region is divided into a plurality of detection display regions, each of the detection display regions including at least two of the first gate lines;
the duration of the pre-stored gate-on signal comprises a second duration, one of the sub-display regions corresponds to one of the second durations, and the method for determining the second duration comprises the following steps:
for each detection display area, adjusting the duration time of a grid electrode opening signal of a first grid line in the detection display area to enable the brightness of each detection display area to be the same as a second preset reference brightness;
and storing the adjusted duration of the gate-on signal of each first gate line as the second duration.
7. The driving method according to claim 6, wherein the method of determining the second preset reference luminance includes:
for each first grid line, selecting the same duration time of the grid opening signal of the first grid line so as to enable each detection display area to emit light;
respectively measuring the brightness of the detection display areas;
and determining one of the brightness of the detection display area as the second preset reference brightness.
8. The driving method according to claim 2 or 5, wherein the difference between the durations of the gate-on signals for every two adjacent sub-display regions is the same.
9. The driving device of the display panel is characterized in that the display panel comprises a display area and a binding area, wherein the display area comprises a plurality of sub-pixels and a plurality of first grid lines; one row of sub-pixels corresponds to one first grid line; the sub-pixels comprise light emitting devices and light emitting control transistors, the grid electrodes of the light emitting control transistors are electrically connected with the corresponding first grid lines, the first electrodes of the light emitting control transistors are electrically connected with the anodes of the light emitting devices, and the second electrodes of the light emitting control transistors are electrically connected with a reference voltage signal end;
dividing the display area into a plurality of sub-display areas, wherein each sub-display area comprises at least one first grid line;
the driving device is used for controlling the duration time of the grid opening signal of the first grid line in each sub-display area to change in sequence along the direction of the sub-display area pointing to the binding area within one frame time according to the duration time of the grid opening signal stored in advance, so that the lighting time of the sub-pixels in each sub-display area changes in sequence.
10. A display device characterized in that it comprises a display panel and a driving device of the display panel as claimed in claim 9.
11. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, realizes the steps of the driving method of the display panel according to any one of claims 1 to 8.
12. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the driving method of the display panel according to any one of claims 1 to 8 when executing the program.
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