CN113380194B - Display panel display method, display panel and display device - Google Patents
Display panel display method, display panel and display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- 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
- G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
Abstract
The invention discloses a display method of a display panel, the display panel and a display device. The display panel includes a pixel driving circuit including: the data writing module is used for writing data voltage into the driving module, and the driving module is used for generating driving current according to the data voltage; the display method comprises the following steps: when a gray scale picture is displayed, determining a turn-off voltage corresponding to the gray scale picture according to a data voltage corresponding to the gray scale picture and a turn-off compensation voltage; the turn-off voltage is used for turning off the data writing module, and the turn-off compensation voltage is a fixed value. The invention can improve the switching characteristic of the data writing module in the pixel driving circuit, reduce the flicker phenomenon when the display panel displays and improve the display effect.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a display method of a display panel, and a display device.
Background
With the development of display technologies, the applications of display panels are more and more extensive, and the requirements on the display effects of the display panels are higher and higher correspondingly.
However, the conventional display panel has a problem of flicker during display, which results in a poor display effect of the display panel.
Disclosure of Invention
The invention provides a display method of a display panel, the display panel and a display device, which are used for reducing the flicker phenomenon of the display panel during display and improving the display effect.
In a first aspect, an embodiment of the present invention provides a display method of a display panel, where the display panel includes a pixel driving circuit, and the pixel driving circuit includes: the data writing module is used for writing data voltage into the driving module, and the driving module is used for generating driving current according to the data voltage; the display method comprises the following steps: when a gray scale picture is displayed, determining a turn-off voltage corresponding to the gray scale picture according to a data voltage corresponding to the gray scale picture and a turn-off compensation voltage; the turn-off voltage is used for turning off the data writing module, and the turn-off compensation voltage is a fixed value.
Optionally, before displaying the grayscale picture, the method further includes: determining a turn-off voltage and a data voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value; and determining a turn-off compensation voltage according to the data voltage corresponding to the maximum brightness of the display panel and the turn-off voltage.
Optionally, the determining a turn-off compensation voltage according to a data voltage corresponding to the maximum brightness of the display panel and a turn-off voltage includes: subtracting the data voltage corresponding to the maximum brightness from the turn-off voltage corresponding to the maximum brightness to obtain a turn-off compensation voltage; determining the turn-off voltage corresponding to the gray scale picture according to the data voltage and the turn-off voltage corresponding to the gray scale picture when the gray scale picture is displayed comprises: and adding the turn-off compensation voltage to the data voltage corresponding to the gray scale picture to obtain a turn-off voltage corresponding to the gray scale picture.
Optionally, when it is determined that the display panel displays the maximum gray scale under the preset display brightness value, the turn-off voltage corresponding to the maximum brightness of the display panel includes: sequentially adjusting the value of the turn-off voltage within a preset range to obtain the brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value; and taking the turn-off voltage corresponding to the maximum brightness of the display panel as the turn-off voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under the preset display brightness value.
Optionally, the display method further includes: determining a plurality of panels in the same batch with the display panels, and when a preset gray scale is displayed under a preset display brightness value, the turn-off voltage and the data voltage corresponding to the maximum brightness of the panels in the same batch; determining the turn-off compensation voltage of the panels in the same batch according to the data voltage corresponding to the maximum brightness of the panels in the same batch and the turn-off voltage; and taking the average value of the turn-off compensation voltages of the panels in the same batch and the turn-off compensation voltage of the display panel as the turn-off compensation voltage of the display panel.
In a second aspect, an embodiment of the present invention further provides a display panel, where the display panel includes a pixel driving circuit, and the pixel driving circuit includes: the data writing module is used for writing data voltage into the driving module, and the driving module is used for generating driving current according to the data voltage; the display panel further includes: the first determining module is used for determining a turn-off voltage corresponding to a gray scale picture according to a data voltage and a turn-off compensation voltage corresponding to the gray scale picture when the gray scale picture is displayed; wherein the turn-off voltage is used to turn off the data write module; the turn-off compensation voltage is a fixed value.
Optionally, the display panel further comprises: the second determining module is used for determining a turn-off voltage and a data voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value; the first determining module is used for determining a turn-off compensation voltage according to a data voltage corresponding to the maximum brightness of the display panel and a turn-off voltage.
Optionally, the second determining module is configured to subtract the data voltage corresponding to the maximum brightness from the turn-off voltage corresponding to the maximum brightness to obtain the turn-off compensation voltage; the first determining module is used for adding the turn-off compensation voltage to the data voltage corresponding to the gray scale picture to obtain the turn-off voltage corresponding to the gray scale picture.
Optionally, the second determining module is configured to sequentially adjust the value of the turn-off voltage within a preset range, and acquire the brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value; and taking the turn-off voltage corresponding to the maximum brightness of the display panel as the turn-off voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under the preset display brightness value.
In a third aspect, an embodiment of the present invention further provides a display device, where the display device includes the display panel according to the second aspect.
According to the technical scheme of the embodiment of the invention, the adopted display method comprises the following steps: when a gray scale picture is displayed, determining a turn-off voltage corresponding to the gray scale picture according to a data voltage corresponding to the gray scale picture and a turn-off compensation voltage; the turn-off voltage is used for turning off the data writing module, and the turn-off voltage is a fixed value. When any gray scale picture is displayed, the grid source voltage of the data writing module is the same, the conduction time of the data writing module is the same, and the data writing time is the same, so that the switching effect of the data writing module is stable when different gray scale pictures are displayed, and the display effect is greatly improved. In addition, the on-time of the data writing module can be prolonged by compensating a turn-off compensation voltage, so that the pixel driving circuit can better keep the potential of the control end of the driving module in the light-emitting stage, and the picture flicker phenomenon is reduced.
Drawings
Fig. 1 is a flowchart illustrating a display method of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of another pixel driving circuit according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a display method of a display panel according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
As mentioned in the background art, the display panel in the prior art may have a flicker problem during displaying, and the applicant has found that the reason for this technical problem is: the display panel adopts a pixel driving circuit to control the light emitting of a light emitting module in the pixel driving circuit so as to realize the display function, each switch transistor in the pixel driving circuit needs to be switched off by a switching-off voltage, and the switching-off voltage in the existing display panel is a fixed value; for a data writing transistor for writing data voltage into a driving transistor in a pixel driving circuit, the gate-source voltage of the data writing transistor is the cut-off voltage minus the data voltage, and because the displayed gray scale pictures are different and the data voltages are different, the gate-source voltages corresponding to the data writing transistor are different when the different gray scale pictures are displayed; the gate-source voltage determines the time Tr required for the data writing transistor to change from the on state to the off state and the time Tf required for the data writing transistor to change from the off state to the on state; in the prior art, the turn-off voltage is a fixed value, Tr and Tf are large, and Tr and Tf corresponding to different gray-scale pictures are different, which causes the on-time Ton of the data writing transistor to be different, wherein Ton + Tr + Tf is a fixed value when each frame time is fixed; tr and Tf are larger, so that the data writing time for writing the data voltage into the driving transistor is shorter, the problem of flicker of the display panel is caused, and the flicker phenomenon is more obvious when the refresh frequency is low; the turn-off voltage is a fixed value, so that the data writing time corresponding to different gray scales is different, the switching characteristic is unstable, and the display effect is poor.
In order to solve the technical problems, the invention provides the following solutions:
fig. 1 is a flowchart of a display method of a display panel according to an embodiment of the present invention, and referring to fig. 1, the display method includes:
step S10, when displaying the gray scale picture, determining the turn-off voltage corresponding to the gray scale picture according to the data voltage corresponding to the gray scale picture and the turn-off compensation voltage; the turn-off voltage is used for turning off the data writing module, and the turn-off voltage is a fixed value.
Specifically, the display panel includes a plurality of pixel driving circuits arranged in an array, as shown in fig. 2, fig. 2 is a schematic circuit diagram of a pixel driving circuit according to an embodiment of the present invention, the pixel driving circuit includes a driving module 101, a data writing module 102, a memory module 103, and a light emitting module 104, a first terminal of the data writing module 102 is connected to a data voltage Vdata, a second terminal of the data writing module 102 is electrically connected to a control terminal of the driving module 101, a control terminal of the data writing module 102 is connected to a first scan signal S1, a first scan signal S1 provides a turn-off level for turning off the data writing module 102, a first terminal of the memory module 103 is electrically connected to the first terminal of the driving module 101, a second terminal of the memory module 103 is electrically connected to the control terminal of the driving module 101, a first terminal of the driving module 101 is connected to a first level signal VDD, a second terminal of the driving module 101 is electrically connected to a first terminal of the light emitting module 104, a second end of the light emitting module 104 is connected to a second level signal VSS; the driving module 101 and the data writing module 102 may be P-type transistors, the storage module 103 may be a capacitor, the Light Emitting module 104 may be an OLED (Organic Light-Emitting Diode), the pixel driving circuit shown in fig. 2 includes two transistors and one capacitor, which is also commonly referred to as a "2T 1C" pixel driving circuit in the art, and the working principle thereof is well known to those skilled in the art and will not be described herein; the turn-off voltage of the first scan signal S1 influences the time for writing the data voltage into the control terminal of the driving module 101 in the data writing phase;
or, fig. 3 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention, and referring to fig. 3, the pixel driving circuit shown in fig. 3 includes a driving module 101, a data writing module 102, a storage module 103, a light emitting module 104, a threshold compensation module 105, a first initialization module 106, a second initialization module 107, a first light emitting control module 108, and a second light emitting control module 109; a first end of the data writing module 102 is connected to a data voltage Vdata, a second end of the data writing module 102 is electrically connected to a first end of the driving module 101, a control end of the data writing module 102 is connected to a first scanning signal S1, and the first scanning signal S1 provides a turn-off voltage of the data writing module 102; a first end of the first light emitting control module 108 is connected to the first level signal VDD, a second end of the first light emitting control module 108 is electrically connected to a first end of the driving module 101, and a control end of the first light emitting control module 108 is connected to the enable signal EM; a first end of the storage module 103 is electrically connected with a first end of the first lighting control module 108, and a second end of the storage module 103 is electrically connected with a control end of the driving module 101; a first end of the second light-emitting control module 109 is electrically connected with a second end of the driving module 101, a second end of the second light-emitting control module 109 is electrically connected with a first end of the light-emitting module 104, and a control end of the second light-emitting control module 109 is connected to the enable signal EM; a second end of the light emitting module 104 is connected to a second level signal VSS; a first end of the first initialization module 106 is connected to the reference signal Vref, a second end of the first initialization module 106 is electrically connected to a control end of the driving module 101, and the control end of the first initialization module 106 is connected to the second scanning signal S2; a first end of the second initialization module 107 is connected to the reference signal Vref, a second end of the second initialization module 107 is electrically connected to a first end of the light emitting module 104, and a control end of the second initialization module 107 is connected to the second scanning signal S2; the first end of the threshold compensation module 105 is electrically connected to the second end of the driving module 101, the second end of the threshold compensation module 105 is electrically connected to the second end of the driving module 101, and the control end of the threshold compensation module 105 is connected to the third scanning signal S3; in this embodiment, the data writing module 102, the driving module 101, the threshold compensation module 105, the first initialization module 108, the second light emission control module 109, the first initialization module 106, and the second initialization module 107 may all employ transistors, wherein the threshold compensation module may employ IGZO transistors or LTPS transistors, when the threshold compensation module employs LTPS transistors, the third scan signal S3 is obtained by multiplexing the first scan signal S1, the data writing module may employ LTPS transistors, and the storage module 103 may employ capacitors, and the pixel driving circuit shown in fig. 3 is also referred to as a "7T 1C" pixel driving circuit in the art, and its specific operation principle is well known by those skilled in the art, and will not be described herein again.
In the pixel driving circuit shown in fig. 2 and fig. 3, the data writing module may adopt a P-type LTPS transistor, the turn-off voltage of the P-type LTPS transistor is a high level, the high level is VGH, and the gate-source voltage when the data writing module 102 is turned off is VGH-Vdata, in this embodiment, when a gray scale picture is displayed, the data voltage Vdata is first determined, and then the data voltage Vdata compensates a turn-off compensation voltage Δ V of a fixed value as the turn-off voltage, that is, at this time, VGH is Vdata + Δ V, the gate-source voltage is VGH-Vdata + Δ V, that is, the technical solution of this embodiment is adopted, and no matter what gray scale picture is displayed, the gate-source voltage of the data writing module is the same, the turn-on time of the data writing module is the same, the data writing time is the same, so that the switching effect of the data writing module is more stable when different gray scale pictures are displayed, the display effect is greatly improved. In addition, by compensating for a turn-off compensation voltage, the time Tr required by the data writing module to be converted from the on state to the off state and the time Tf required by the data writing module to be converted from the off state to the on state can be reduced, so that the on-time Ton of the data writing module is increased, the electric potential of the control end of the driving module can be better kept by the pixel driving circuit in the light-emitting stage, and the image flicker phenomenon is reduced.
According to the technical scheme of the embodiment, the adopted display method comprises the following steps: when a gray scale picture is displayed, determining a turn-off voltage corresponding to the gray scale picture according to a data voltage corresponding to the gray scale picture and a turn-off compensation voltage; the turn-off voltage is used for turning off the data writing module, and the turn-off voltage is a fixed value. When any gray scale picture is displayed, the grid source voltage of the data writing module is the same, the conduction time of the data writing module is the same, and the data writing time is the same, so that the switching effect of the data writing module is stable when different gray scale pictures are displayed, and the display effect is greatly improved. In addition, the on-time of the data writing module can be prolonged by compensating a turn-off compensation voltage, so that the pixel driving circuit can better keep the potential of the control end of the driving module in the light-emitting stage, and the picture flicker phenomenon is reduced.
Optionally, fig. 4 is a flowchart of a display method of a display panel according to another embodiment of the present invention, and referring to fig. 4, before displaying a gray-scale image, the method further includes:
step S20, determining a turn-off voltage and a data voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value;
specifically, a Brightness adjustment key is generally included in the Display panel, and an input Display Brightness Value (DBV) can be changed by the Brightness adjustment key. The display brightness value corresponds to one display brightness of the maximum gray scale in the display panel, and after the display brightness corresponding to the maximum gray scale in the display panel is changed, the display brightness corresponding to other gray scales is also changed. Specifically, when the display brightness corresponding to the maximum gray scale in the display panel is increased, the display brightness corresponding to other gray scales is also increased; when the display brightness corresponding to the maximum gray scale in the display panel is reduced, the display brightness corresponding to other gray scales is also reduced. However, when the display luminance value is determined, for example, when the current display luminance value is determined to be the preset maximum display luminance value, the data voltage Vdata is a determined value, and the display luminance corresponding to the maximum gray scale may cause the display luminance to fluctuate within a small range according to different parameters in the pixel driving circuit; the inventors have found through careful study that when the value of the off voltage VGH is adjusted, there is a certain variation in the display brightness, and the off voltage VGH makes the on-time Ton of the data writing module longest when the display brightness reaches the maximum, so as to maximally improve the data writing time, and further maximally improve the flicker phenomenon.
Step S21, determining the turn-off compensation voltage according to the data voltage corresponding to the maximum brightness of the display panel and the turn-off voltage.
Specifically, the turn-off compensation voltage can be obtained by subtracting the data voltage corresponding to the maximum brightness from the turn-off voltage corresponding to the maximum brightness, and the turn-on time Ton of the data writing module is the longest due to the turn-off voltage corresponding to the maximum brightness, that is, the switching characteristic of the data writing module is the best under the gate-source voltage, so that the gate-source voltage can be used as the turn-off compensation voltage; when a gray scale picture is displayed, the data voltage corresponding to the gray scale picture and the turn-off compensation voltage corresponding to the maximum brightness are used as the turn-off voltage of the gray scale picture, so that the data writing module still has the best switching characteristic when the gray scale picture is displayed, namely the turn-on time Ton of the data writing module is longest, the data writing time can be prolonged to the maximum extent, and the flicker phenomenon can be improved to the maximum extent.
Optionally, when it is determined that the display panel displays the maximum gray scale under the preset display brightness value, the turn-off voltage corresponding to the maximum brightness of the display panel includes:
adjusting the value of the turn-off voltage within a preset range, and acquiring the brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value; and taking the turn-off voltage corresponding to the maximum brightness of the display panel as the turn-off voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under the preset display brightness value.
Specifically, the value of the off-voltage VGH is within a preset range, for example, within 7V to 15V, and the maximum value thereof is 15V, at this time, when the off-voltage is 15V, the luminance of the display panel may be tested by using an optical device, and the off-voltages may be sequentially adjusted, for example, the off-voltage is gradually decreased from the maximum value, for example, the off-voltage is gradually decreased by a step value of 0.1V, and luminances corresponding to a plurality of off-voltages are obtained, so as to obtain the off-voltage corresponding to the maximum luminance; the inventors have found through careful study that the adjustment of the off-voltage can be stopped when the luminance starts to decrease, thereby reducing the amount of work, because the luminance is decreased from the increase to the decrease after the off-voltage is decreased to a certain value and then decreased.
Optionally, the display method further comprises:
determining a plurality of panels in the same batch with the display panels, and when a preset gray scale is displayed under a preset display brightness value, determining a turn-off voltage and a data voltage corresponding to the maximum brightness of the panels in the same batch; determining the turn-off compensation voltage of the panels in the same batch according to the data voltage corresponding to the maximum brightness of the panels in the same batch and the turn-off voltage; and taking the average value of the turn-off compensation voltages of the panels in the same batch and the turn-off compensation voltage of the display panel as the turn-off compensation voltage of the display panel.
Specifically, the turn-off compensation voltage corresponding to the preset display brightness value can be stored in the display panel before the display panel leaves a factory, and a plurality of panels in the same batch can be tested, and the turn-off compensation voltage of the display panel and the turn-off compensation voltage of the panels in the same batch are averaged to be used as the turn-off compensation voltage of the display panel and stored in a driving chip of the display panel, so that the error value of the turn-off compensation voltage is reduced.
An embodiment of the present invention further provides a display panel, as shown in fig. 5, fig. 5 is a schematic structural diagram of the display panel provided in the embodiment of the present invention, the display panel includes a pixel driving circuit, and the pixel driving circuit includes: the data writing module is used for writing data voltage into the driving module, and the driving module is used for generating driving current according to the data voltage; the display panel further includes: the first determining module 201, the first determining module 201 is configured to determine, when a gray scale picture is displayed, a turn-off voltage corresponding to the gray scale picture according to a data voltage corresponding to the gray scale picture and a turn-off compensation voltage; the turn-off voltage is used for turning off the data writing module; the turn-off voltage is a fixed value.
Specifically, the turn-off voltage is a high level, the high level is VGH, and the gate-source voltage when the data writing module is turned off is VGH-Vdata, in this embodiment, when a gray-scale image is displayed, the data voltage Vdata is first determined, and then the data voltage Vdata compensates a turn-off compensation voltage Δ V of a fixed value as the turn-off voltage, that is, at this time, VGH is Vdata + Δ V, and then the gate-source voltage is VGH-Vdata + Δ V-Vdata, that is, the technical scheme of this embodiment is adopted. In addition, by compensating for a turn-off compensation voltage, the time Tr required by the data writing module to be converted from the on state to the off state and the time Tf required by the data writing module to be converted from the off state to the on state can be reduced, so that the on-time Ton of the data writing module is increased, the electric potential of the control end of the driving module can be better kept by the pixel driving circuit in the light-emitting stage, and the image flicker phenomenon is reduced.
According to the technical scheme, no matter what gray scale picture is displayed on the display panel, the gate-source voltage of the data writing module is the same, the conduction time of the data writing module is the same, the data writing time is the same, the switching effect of the data writing module is stable when different gray scale pictures are displayed, and the display effect is greatly improved. In addition, the on-time of the data writing module can be prolonged by compensating a turn-off compensation voltage, so that the pixel driving circuit can better keep the potential of the control end of the driving module in the light-emitting stage, and the picture flicker phenomenon is reduced.
Optionally, the display panel further comprises: the second determining module is used for determining the turn-off voltage and the data voltage corresponding to the maximum brightness of the display panel when the display panel displays the preset gray scale under the preset display brightness value; the first determining module is used for determining the turn-off compensation voltage according to the data voltage corresponding to the maximum brightness of the display panel and the turn-off voltage.
Specifically, when the value of the off voltage VGH is adjusted, the display brightness may have a certain change, and the off voltage VGH makes the on-time Ton of the data writing module longest when the display brightness reaches the maximum, so that the data writing time can be maximally increased, and the flicker phenomenon can be maximally improved. The second determining module can subtract the turn-off voltage corresponding to the maximum brightness from the data voltage corresponding to the maximum brightness to obtain a turn-off compensation voltage, and the turn-off voltage corresponding to the maximum brightness enables the turn-on time Ton of the data writing module to be longest, namely the switching characteristic of the data writing module is best under the gate source voltage, so that the gate source voltage can be used as the turn-off compensation voltage; when a gray scale picture is displayed, the first determining module can utilize the data voltage corresponding to the gray scale picture and the turn-off compensation voltage corresponding to the maximum brightness as the turn-off voltage of the gray scale picture, so that the data writing module still has the optimal switching characteristic when the gray scale picture is displayed, namely the turn-on time Ton of the data writing module is longest, the data writing time can be prolonged to the maximum extent, and the flicker phenomenon can be improved to the maximum extent.
Optionally, the second determining module is configured to adjust the value of the turn-off voltage within a preset range, and acquire the brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value; and taking the turn-off voltage corresponding to the maximum brightness of the display panel as the turn-off voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under the preset display brightness value.
Specifically, the value of the off-voltage VGH is within a preset range, for example, within 7V to 15V, and the maximum value thereof is 15V, at this time, when the off-voltage is 15V, the luminance of the display panel may be tested by using an optical device, and the off-voltages may be sequentially adjusted, for example, the off-voltage is gradually decreased from the maximum value, for example, the off-voltage is gradually decreased by a step value of 0.1V, and luminances corresponding to a plurality of off-voltages are obtained, so as to obtain the off-voltage corresponding to the maximum luminance; the inventors have found through careful study that the adjustment of the off-voltage can be stopped when the luminance starts to decrease, thereby reducing the amount of work, because the luminance is decreased from the increase to the decrease after the off-voltage is decreased to a certain value and then decreased.
It should be noted that the first determining module, the second determining module, and the third determining module of the present embodiment may all be integrated in the display panel driving chip.
Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 6, the display device according to the embodiment of the present invention includes a display panel according to any embodiment of the present invention, and the display device may be a mobile phone, a tablet computer, a display, a vehicle-mounted display screen, an MP3, an MP4, a smart watch, or other wearable device.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A display method of a display panel, the display panel including a pixel drive circuit, the pixel drive circuit comprising: the data writing module is used for writing data voltage into the driving module, and the driving module is used for generating driving current according to the data voltage;
the display method is characterized by comprising the following steps:
when a gray scale picture is displayed, determining a turn-off voltage corresponding to the gray scale picture according to a data voltage corresponding to the gray scale picture and a turn-off compensation voltage; the turn-off voltage is used for turning off the data writing module, and the turn-off compensation voltage is a fixed value;
under different data voltages, the voltage difference between the grid and the source of the data writing module is a fixed value; determining the turn-off voltage corresponding to the gray scale picture according to the data voltage and the turn-off compensation voltage corresponding to the gray scale picture based on the following determination:
VGH is Vdata + Δ V; VGH is the turn-off voltage corresponding to the gray scale picture, Vdata is the data voltage corresponding to the gray scale picture; Δ V is the turn-off compensation voltage;
before displaying the gray scale picture, the method further comprises the following steps: determining a turn-off voltage and a data voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value; and determining a turn-off compensation voltage according to the data voltage corresponding to the maximum brightness of the display panel and the turn-off voltage.
2. The method according to claim 1, wherein the determining an off compensation voltage according to the data voltage corresponding to the maximum brightness of the display panel and an off voltage comprises:
subtracting the data voltage corresponding to the maximum brightness from the turn-off voltage corresponding to the maximum brightness to obtain a turn-off compensation voltage;
determining the turn-off voltage corresponding to the gray scale picture according to the data voltage and the turn-off voltage corresponding to the gray scale picture when the gray scale picture is displayed comprises:
and adding the turn-off compensation voltage to the data voltage corresponding to the gray scale picture to obtain a turn-off voltage corresponding to the gray scale picture.
3. The method according to claim 1, wherein when determining that the display panel displays the maximum gray scale at a preset display brightness value, the determining a turn-off voltage corresponding to the maximum brightness of the display panel comprises:
sequentially adjusting the value of the turn-off voltage within a preset range to obtain the brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value;
and taking the turn-off voltage corresponding to the maximum brightness of the display panel as the turn-off voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under the preset display brightness value.
4. The display method according to claim 1, further comprising:
determining a plurality of panels in the same batch with the display panels, and when a preset gray scale is displayed under a preset display brightness value, the turn-off voltage and the data voltage corresponding to the maximum brightness of the panels in the same batch;
determining the turn-off compensation voltage of the panels in the same batch according to the data voltage corresponding to the maximum brightness of the panels in the same batch and the turn-off voltage;
and taking the average value of the turn-off compensation voltages of the panels in the same batch and the turn-off compensation voltage of the display panel as the turn-off compensation voltage of the display panel.
5. A display panel comprising a pixel driving circuit, the pixel driving circuit comprising: the data writing module is used for writing data voltage into the driving module, and the driving module is used for generating driving current according to the data voltage;
the display panel further includes: the first determining module is used for determining a turn-off voltage corresponding to a gray scale picture according to a data voltage and a turn-off compensation voltage corresponding to the gray scale picture when the gray scale picture is displayed; wherein the turn-off voltage is used to turn off the data write module; the turn-off compensation voltage is a fixed value;
under different data voltages, the voltage difference between the grid and the source of the data writing module is a fixed value; determining the turn-off voltage corresponding to the gray scale picture according to the data voltage and the turn-off compensation voltage corresponding to the gray scale picture based on the following determination:
VGH ═ Vdata + Δ V; VGH is the turn-off voltage corresponding to the gray scale picture, Vdata is the data voltage corresponding to the gray scale picture; Δ V is the turn-off compensation voltage;
the display panel further includes: the second determining module is used for determining a turn-off voltage and a data voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value;
the first determining module is used for determining a turn-off compensation voltage according to a data voltage corresponding to the maximum brightness of the display panel and a turn-off voltage.
6. The display panel according to claim 5,
the second determining module is configured to subtract the data voltage corresponding to the maximum brightness from the turn-off voltage corresponding to the maximum brightness to obtain the turn-off compensation voltage;
the first determining module is used for adding the turn-off compensation voltage to the data voltage corresponding to the gray scale picture to obtain the turn-off voltage corresponding to the gray scale picture.
7. The display panel according to claim 5,
the second determining module is used for sequentially adjusting the value of the turn-off voltage within a preset range to obtain the brightness of the display panel when the display panel displays the maximum gray scale under a preset display brightness value;
and taking the turn-off voltage corresponding to the maximum brightness of the display panel as the turn-off voltage corresponding to the maximum brightness of the display panel when the display panel displays the maximum gray scale under the preset display brightness value.
8. A display device characterized in that it comprises a display panel according to any one of claims 5 to 7.
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